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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Linux INET6 implementation | |
4 | * FIB front-end. | |
5 | * | |
6 | * Authors: | |
1ab1457c | 7 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
8 | */ |
9 | ||
10 | /* Changes: | |
11 | * | |
12 | * YOSHIFUJI Hideaki @USAGI | |
13 | * reworked default router selection. | |
14 | * - respect outgoing interface | |
15 | * - select from (probably) reachable routers (i.e. | |
16 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
17 | * - always select the same router if it is (probably) | |
18 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
19 | * Ville Nuorvala |
20 | * Fixed routing subtrees. | |
1da177e4 LT |
21 | */ |
22 | ||
f3213831 JP |
23 | #define pr_fmt(fmt) "IPv6: " fmt |
24 | ||
4fc268d2 | 25 | #include <linux/capability.h> |
1da177e4 | 26 | #include <linux/errno.h> |
bc3b2d7f | 27 | #include <linux/export.h> |
1da177e4 LT |
28 | #include <linux/types.h> |
29 | #include <linux/times.h> | |
30 | #include <linux/socket.h> | |
31 | #include <linux/sockios.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/route.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/in6.h> | |
7bc570c8 | 36 | #include <linux/mroute6.h> |
1da177e4 | 37 | #include <linux/init.h> |
1da177e4 | 38 | #include <linux/if_arp.h> |
1da177e4 LT |
39 | #include <linux/proc_fs.h> |
40 | #include <linux/seq_file.h> | |
5b7c931d | 41 | #include <linux/nsproxy.h> |
5a0e3ad6 | 42 | #include <linux/slab.h> |
35732d01 | 43 | #include <linux/jhash.h> |
4785305c | 44 | #include <linux/siphash.h> |
457c4cbc | 45 | #include <net/net_namespace.h> |
1da177e4 LT |
46 | #include <net/snmp.h> |
47 | #include <net/ipv6.h> | |
48 | #include <net/ip6_fib.h> | |
49 | #include <net/ip6_route.h> | |
50 | #include <net/ndisc.h> | |
51 | #include <net/addrconf.h> | |
52 | #include <net/tcp.h> | |
53 | #include <linux/rtnetlink.h> | |
54 | #include <net/dst.h> | |
904af04d | 55 | #include <net/dst_metadata.h> |
1da177e4 | 56 | #include <net/xfrm.h> |
8d71740c | 57 | #include <net/netevent.h> |
21713ebc | 58 | #include <net/netlink.h> |
3c618c1d | 59 | #include <net/rtnh.h> |
19e42e45 | 60 | #include <net/lwtunnel.h> |
904af04d | 61 | #include <net/ip_tunnels.h> |
ca254490 | 62 | #include <net/l3mdev.h> |
eacb9384 | 63 | #include <net/ip.h> |
7c0f6ba6 | 64 | #include <linux/uaccess.h> |
951cf368 | 65 | #include <linux/btf_ids.h> |
1da177e4 LT |
66 | |
67 | #ifdef CONFIG_SYSCTL | |
68 | #include <linux/sysctl.h> | |
69 | #endif | |
70 | ||
30d444d3 DA |
71 | static int ip6_rt_type_to_error(u8 fib6_type); |
72 | ||
73 | #define CREATE_TRACE_POINTS | |
74 | #include <trace/events/fib6.h> | |
75 | EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup); | |
76 | #undef CREATE_TRACE_POINTS | |
77 | ||
afc154e9 | 78 | enum rt6_nud_state { |
7e980569 JB |
79 | RT6_NUD_FAIL_HARD = -3, |
80 | RT6_NUD_FAIL_PROBE = -2, | |
81 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
82 | RT6_NUD_SUCCEED = 1 |
83 | }; | |
84 | ||
bbd807df BV |
85 | INDIRECT_CALLABLE_SCOPE |
86 | struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 87 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
f67fbeae BV |
88 | INDIRECT_CALLABLE_SCOPE |
89 | unsigned int ip6_mtu(const struct dst_entry *dst); | |
1da177e4 LT |
90 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
91 | static void ip6_dst_destroy(struct dst_entry *); | |
92 | static void ip6_dst_ifdown(struct dst_entry *, | |
43c28172 | 93 | struct net_device *dev); |
af6d1034 | 94 | static void ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
95 | |
96 | static int ip6_pkt_discard(struct sk_buff *skb); | |
ede2059d | 97 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
7150aede | 98 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
ede2059d | 99 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 100 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 | 101 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
102 | struct sk_buff *skb, u32 mtu, |
103 | bool confirm_neigh); | |
6700c270 DM |
104 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, |
105 | struct sk_buff *skb); | |
702cea56 DA |
106 | static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif, |
107 | int strict); | |
a1b7a1f0 | 108 | static size_t rt6_nlmsg_size(struct fib6_info *f6i); |
d4ead6b3 | 109 | static int rt6_fill_node(struct net *net, struct sk_buff *skb, |
8d1c802b | 110 | struct fib6_info *rt, struct dst_entry *dst, |
d4ead6b3 | 111 | struct in6_addr *dest, struct in6_addr *src, |
16a16cd3 DA |
112 | int iif, int type, u32 portid, u32 seq, |
113 | unsigned int flags); | |
7e4b5128 | 114 | static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res, |
510e2ced WW |
115 | const struct in6_addr *daddr, |
116 | const struct in6_addr *saddr); | |
1da177e4 | 117 | |
70ceb4f5 | 118 | #ifdef CONFIG_IPV6_ROUTE_INFO |
8d1c802b | 119 | static struct fib6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 120 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
121 | const struct in6_addr *gwaddr, |
122 | struct net_device *dev, | |
95c96174 | 123 | unsigned int pref); |
8d1c802b | 124 | static struct fib6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 125 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
126 | const struct in6_addr *gwaddr, |
127 | struct net_device *dev); | |
70ceb4f5 YH |
128 | #endif |
129 | ||
8d0b94af MKL |
130 | struct uncached_list { |
131 | spinlock_t lock; | |
132 | struct list_head head; | |
ba55ef81 | 133 | struct list_head quarantine; |
8d0b94af MKL |
134 | }; |
135 | ||
136 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
137 | ||
510c321b | 138 | void rt6_uncached_list_add(struct rt6_info *rt) |
8d0b94af MKL |
139 | { |
140 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
141 | ||
d288a162 | 142 | rt->dst.rt_uncached_list = ul; |
8d0b94af MKL |
143 | |
144 | spin_lock_bh(&ul->lock); | |
d288a162 | 145 | list_add_tail(&rt->dst.rt_uncached, &ul->head); |
8d0b94af MKL |
146 | spin_unlock_bh(&ul->lock); |
147 | } | |
148 | ||
510c321b | 149 | void rt6_uncached_list_del(struct rt6_info *rt) |
8d0b94af | 150 | { |
d288a162 WG |
151 | if (!list_empty(&rt->dst.rt_uncached)) { |
152 | struct uncached_list *ul = rt->dst.rt_uncached_list; | |
8d0b94af MKL |
153 | |
154 | spin_lock_bh(&ul->lock); | |
d288a162 | 155 | list_del_init(&rt->dst.rt_uncached); |
8d0b94af MKL |
156 | spin_unlock_bh(&ul->lock); |
157 | } | |
158 | } | |
159 | ||
e5f80fcf | 160 | static void rt6_uncached_list_flush_dev(struct net_device *dev) |
8d0b94af | 161 | { |
8d0b94af MKL |
162 | int cpu; |
163 | ||
164 | for_each_possible_cpu(cpu) { | |
165 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
ba55ef81 ED |
166 | struct rt6_info *rt, *safe; |
167 | ||
168 | if (list_empty(&ul->head)) | |
169 | continue; | |
8d0b94af MKL |
170 | |
171 | spin_lock_bh(&ul->lock); | |
d288a162 | 172 | list_for_each_entry_safe(rt, safe, &ul->head, dst.rt_uncached) { |
8d0b94af MKL |
173 | struct inet6_dev *rt_idev = rt->rt6i_idev; |
174 | struct net_device *rt_dev = rt->dst.dev; | |
ba55ef81 | 175 | bool handled = false; |
8d0b94af | 176 | |
e332bc67 | 177 | if (rt_idev->dev == dev) { |
e5f80fcf | 178 | rt->rt6i_idev = in6_dev_get(blackhole_netdev); |
8d0b94af | 179 | in6_dev_put(rt_idev); |
ba55ef81 | 180 | handled = true; |
8d0b94af MKL |
181 | } |
182 | ||
e332bc67 | 183 | if (rt_dev == dev) { |
8d7017fd | 184 | rt->dst.dev = blackhole_netdev; |
d62607c3 JK |
185 | netdev_ref_replace(rt_dev, blackhole_netdev, |
186 | &rt->dst.dev_tracker, | |
187 | GFP_ATOMIC); | |
ba55ef81 | 188 | handled = true; |
8d0b94af | 189 | } |
ba55ef81 | 190 | if (handled) |
d288a162 | 191 | list_move(&rt->dst.rt_uncached, |
ba55ef81 | 192 | &ul->quarantine); |
8d0b94af MKL |
193 | } |
194 | spin_unlock_bh(&ul->lock); | |
195 | } | |
196 | } | |
197 | ||
f8a1b43b | 198 | static inline const void *choose_neigh_daddr(const struct in6_addr *p, |
f894cbf8 DM |
199 | struct sk_buff *skb, |
200 | const void *daddr) | |
39232973 | 201 | { |
a7563f34 | 202 | if (!ipv6_addr_any(p)) |
39232973 | 203 | return (const void *) p; |
f894cbf8 DM |
204 | else if (skb) |
205 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
206 | return daddr; |
207 | } | |
208 | ||
f8a1b43b DA |
209 | struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw, |
210 | struct net_device *dev, | |
211 | struct sk_buff *skb, | |
212 | const void *daddr) | |
d3aaeb38 | 213 | { |
39232973 DM |
214 | struct neighbour *n; |
215 | ||
f8a1b43b DA |
216 | daddr = choose_neigh_daddr(gw, skb, daddr); |
217 | n = __ipv6_neigh_lookup(dev, daddr); | |
f83c7790 DM |
218 | if (n) |
219 | return n; | |
7adf3246 SB |
220 | |
221 | n = neigh_create(&nd_tbl, daddr, dev); | |
222 | return IS_ERR(n) ? NULL : n; | |
f8a1b43b DA |
223 | } |
224 | ||
225 | static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst, | |
226 | struct sk_buff *skb, | |
227 | const void *daddr) | |
228 | { | |
e8dfd42c | 229 | const struct rt6_info *rt = dst_rt6_info(dst); |
f8a1b43b | 230 | |
2c6b55f4 ND |
231 | return ip6_neigh_lookup(rt6_nexthop(rt, &in6addr_any), |
232 | dst->dev, skb, daddr); | |
f83c7790 DM |
233 | } |
234 | ||
63fca65d JA |
235 | static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
236 | { | |
e8dfd42c | 237 | const struct rt6_info *rt = dst_rt6_info(dst); |
63fca65d | 238 | struct net_device *dev = dst->dev; |
63fca65d | 239 | |
cbfd6891 | 240 | daddr = choose_neigh_daddr(rt6_nexthop(rt, &in6addr_any), NULL, daddr); |
63fca65d JA |
241 | if (!daddr) |
242 | return; | |
243 | if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) | |
244 | return; | |
245 | if (ipv6_addr_is_multicast((const struct in6_addr *)daddr)) | |
246 | return; | |
247 | __ipv6_confirm_neigh(dev, daddr); | |
248 | } | |
249 | ||
9a7ec3a9 | 250 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 251 | .family = AF_INET6, |
1da177e4 LT |
252 | .gc = ip6_dst_gc, |
253 | .gc_thresh = 1024, | |
254 | .check = ip6_dst_check, | |
0dbaee3b | 255 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 256 | .mtu = ip6_mtu, |
d4ead6b3 | 257 | .cow_metrics = dst_cow_metrics_generic, |
1da177e4 LT |
258 | .destroy = ip6_dst_destroy, |
259 | .ifdown = ip6_dst_ifdown, | |
260 | .negative_advice = ip6_negative_advice, | |
261 | .link_failure = ip6_link_failure, | |
262 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 263 | .redirect = rt6_do_redirect, |
9f8955cc | 264 | .local_out = __ip6_local_out, |
f8a1b43b | 265 | .neigh_lookup = ip6_dst_neigh_lookup, |
63fca65d | 266 | .confirm_neigh = ip6_confirm_neigh, |
1da177e4 LT |
267 | }; |
268 | ||
14e50e57 | 269 | static struct dst_ops ip6_dst_blackhole_ops = { |
c4c877b2 DB |
270 | .family = AF_INET6, |
271 | .default_advmss = ip6_default_advmss, | |
272 | .neigh_lookup = ip6_dst_neigh_lookup, | |
273 | .check = ip6_dst_check, | |
274 | .destroy = ip6_dst_destroy, | |
275 | .cow_metrics = dst_cow_metrics_generic, | |
276 | .update_pmtu = dst_blackhole_update_pmtu, | |
277 | .redirect = dst_blackhole_redirect, | |
278 | .mtu = dst_blackhole_mtu, | |
14e50e57 DM |
279 | }; |
280 | ||
62fa8a84 | 281 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 282 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
283 | }; |
284 | ||
8d1c802b | 285 | static const struct fib6_info fib6_null_entry_template = { |
93c2fb25 DA |
286 | .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP), |
287 | .fib6_protocol = RTPROT_KERNEL, | |
288 | .fib6_metric = ~(u32)0, | |
f05713e0 | 289 | .fib6_ref = REFCOUNT_INIT(1), |
421842ed DA |
290 | .fib6_type = RTN_UNREACHABLE, |
291 | .fib6_metrics = (struct dst_metrics *)&dst_default_metrics, | |
292 | }; | |
293 | ||
fb0af4c7 | 294 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b | 295 | .dst = { |
bc9d3a9f | 296 | .__rcuref = RCUREF_INIT(1), |
d8d1f30b | 297 | .__use = 1, |
2c20cbd7 | 298 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 299 | .error = -ENETUNREACH, |
d8d1f30b CG |
300 | .input = ip6_pkt_discard, |
301 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
302 | }, |
303 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
1da177e4 LT |
304 | }; |
305 | ||
101367c2 TG |
306 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
307 | ||
fb0af4c7 | 308 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b | 309 | .dst = { |
bc9d3a9f | 310 | .__rcuref = RCUREF_INIT(1), |
d8d1f30b | 311 | .__use = 1, |
2c20cbd7 | 312 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 313 | .error = -EACCES, |
d8d1f30b CG |
314 | .input = ip6_pkt_prohibit, |
315 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
316 | }, |
317 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
101367c2 TG |
318 | }; |
319 | ||
fb0af4c7 | 320 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b | 321 | .dst = { |
bc9d3a9f | 322 | .__rcuref = RCUREF_INIT(1), |
d8d1f30b | 323 | .__use = 1, |
2c20cbd7 | 324 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 325 | .error = -EINVAL, |
d8d1f30b | 326 | .input = dst_discard, |
ede2059d | 327 | .output = dst_discard_out, |
101367c2 TG |
328 | }, |
329 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
101367c2 TG |
330 | }; |
331 | ||
332 | #endif | |
333 | ||
ebfa45f0 MKL |
334 | static void rt6_info_init(struct rt6_info *rt) |
335 | { | |
8f2a83b4 | 336 | memset_after(rt, 0, dst); |
ebfa45f0 MKL |
337 | } |
338 | ||
1da177e4 | 339 | /* allocate dst with ip6_dst_ops */ |
93531c67 DA |
340 | struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev, |
341 | int flags) | |
1da177e4 | 342 | { |
97bab73f | 343 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
762c8dc7 | 344 | DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 345 | |
81eb8447 | 346 | if (rt) { |
ebfa45f0 | 347 | rt6_info_init(rt); |
81eb8447 WW |
348 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
349 | } | |
8104891b | 350 | |
cf911662 | 351 | return rt; |
1da177e4 | 352 | } |
9ab179d8 | 353 | EXPORT_SYMBOL(ip6_dst_alloc); |
d52d3997 | 354 | |
1da177e4 LT |
355 | static void ip6_dst_destroy(struct dst_entry *dst) |
356 | { | |
e8dfd42c | 357 | struct rt6_info *rt = dst_rt6_info(dst); |
a68886a6 | 358 | struct fib6_info *from; |
8d0b94af | 359 | struct inet6_dev *idev; |
1da177e4 | 360 | |
1620a336 | 361 | ip_dst_metrics_put(dst); |
8d0b94af MKL |
362 | rt6_uncached_list_del(rt); |
363 | ||
364 | idev = rt->rt6i_idev; | |
38308473 | 365 | if (idev) { |
1da177e4 LT |
366 | rt->rt6i_idev = NULL; |
367 | in6_dev_put(idev); | |
1ab1457c | 368 | } |
1716a961 | 369 | |
0e233874 | 370 | from = xchg((__force struct fib6_info **)&rt->from, NULL); |
93531c67 | 371 | fib6_info_release(from); |
b3419363 DM |
372 | } |
373 | ||
43c28172 | 374 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev) |
1da177e4 | 375 | { |
e8dfd42c | 376 | struct rt6_info *rt = dst_rt6_info(dst); |
1da177e4 LT |
377 | struct inet6_dev *idev = rt->rt6i_idev; |
378 | ||
e5f80fcf ED |
379 | if (idev && idev->dev != blackhole_netdev) { |
380 | struct inet6_dev *blackhole_idev = in6_dev_get(blackhole_netdev); | |
381 | ||
382 | if (blackhole_idev) { | |
383 | rt->rt6i_idev = blackhole_idev; | |
e5645f51 | 384 | in6_dev_put(idev); |
97cac082 | 385 | } |
1da177e4 LT |
386 | } |
387 | } | |
388 | ||
5973fb1e MKL |
389 | static bool __rt6_check_expired(const struct rt6_info *rt) |
390 | { | |
391 | if (rt->rt6i_flags & RTF_EXPIRES) | |
392 | return time_after(jiffies, rt->dst.expires); | |
393 | else | |
394 | return false; | |
395 | } | |
396 | ||
a50feda5 | 397 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 398 | { |
a68886a6 DA |
399 | struct fib6_info *from; |
400 | ||
401 | from = rcu_dereference(rt->from); | |
402 | ||
1716a961 G |
403 | if (rt->rt6i_flags & RTF_EXPIRES) { |
404 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 405 | return true; |
a68886a6 | 406 | } else if (from) { |
1e2ea8ad | 407 | return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK || |
a68886a6 | 408 | fib6_check_expired(from); |
1716a961 | 409 | } |
a50feda5 | 410 | return false; |
1da177e4 LT |
411 | } |
412 | ||
b1d40991 DA |
413 | void fib6_select_path(const struct net *net, struct fib6_result *res, |
414 | struct flowi6 *fl6, int oif, bool have_oif_match, | |
415 | const struct sk_buff *skb, int strict) | |
51ebd318 | 416 | { |
8d1c802b | 417 | struct fib6_info *sibling, *next_sibling; |
b1d40991 DA |
418 | struct fib6_info *match = res->f6i; |
419 | ||
34fe5a1c | 420 | if (!match->nh && (!match->fib6_nsiblings || have_oif_match)) |
b1d40991 | 421 | goto out; |
51ebd318 | 422 | |
34fe5a1c DA |
423 | if (match->nh && have_oif_match && res->nh) |
424 | return; | |
425 | ||
8423be89 SY |
426 | if (skb) |
427 | IP6CB(skb)->flags |= IP6SKB_MULTIPATH; | |
428 | ||
b673d6cc JS |
429 | /* We might have already computed the hash for ICMPv6 errors. In such |
430 | * case it will always be non-zero. Otherwise now is the time to do it. | |
431 | */ | |
f88d8ea6 DA |
432 | if (!fl6->mp_hash && |
433 | (!match->nh || nexthop_is_multipath(match->nh))) | |
b4bac172 | 434 | fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL); |
b673d6cc | 435 | |
f88d8ea6 DA |
436 | if (unlikely(match->nh)) { |
437 | nexthop_path_fib6_result(res, fl6->mp_hash); | |
438 | return; | |
439 | } | |
440 | ||
1cf844c7 | 441 | if (fl6->mp_hash <= atomic_read(&match->fib6_nh->fib_nh_upper_bound)) |
b1d40991 | 442 | goto out; |
3d709f69 | 443 | |
93c2fb25 DA |
444 | list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings, |
445 | fib6_siblings) { | |
1cf844c7 | 446 | const struct fib6_nh *nh = sibling->fib6_nh; |
5e670d84 DA |
447 | int nh_upper_bound; |
448 | ||
702cea56 | 449 | nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound); |
5e670d84 | 450 | if (fl6->mp_hash > nh_upper_bound) |
3d709f69 | 451 | continue; |
702cea56 | 452 | if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0) |
3d709f69 IS |
453 | break; |
454 | match = sibling; | |
455 | break; | |
456 | } | |
457 | ||
b1d40991 DA |
458 | out: |
459 | res->f6i = match; | |
1cf844c7 | 460 | res->nh = match->fib6_nh; |
51ebd318 ND |
461 | } |
462 | ||
1da177e4 | 463 | /* |
66f5d6ce | 464 | * Route lookup. rcu_read_lock() should be held. |
1da177e4 LT |
465 | */ |
466 | ||
0c59d006 DA |
467 | static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh, |
468 | const struct in6_addr *saddr, int oif, int flags) | |
469 | { | |
470 | const struct net_device *dev; | |
471 | ||
472 | if (nh->fib_nh_flags & RTNH_F_DEAD) | |
473 | return false; | |
474 | ||
475 | dev = nh->fib_nh_dev; | |
476 | if (oif) { | |
477 | if (dev->ifindex == oif) | |
478 | return true; | |
479 | } else { | |
480 | if (ipv6_chk_addr(net, saddr, dev, | |
481 | flags & RT6_LOOKUP_F_IFACE)) | |
482 | return true; | |
483 | } | |
484 | ||
485 | return false; | |
486 | } | |
487 | ||
962b6803 DA |
488 | struct fib6_nh_dm_arg { |
489 | struct net *net; | |
490 | const struct in6_addr *saddr; | |
491 | int oif; | |
492 | int flags; | |
493 | struct fib6_nh *nh; | |
494 | }; | |
495 | ||
496 | static int __rt6_nh_dev_match(struct fib6_nh *nh, void *_arg) | |
497 | { | |
498 | struct fib6_nh_dm_arg *arg = _arg; | |
499 | ||
500 | arg->nh = nh; | |
501 | return __rt6_device_match(arg->net, nh, arg->saddr, arg->oif, | |
502 | arg->flags); | |
503 | } | |
504 | ||
505 | /* returns fib6_nh from nexthop or NULL */ | |
506 | static struct fib6_nh *rt6_nh_dev_match(struct net *net, struct nexthop *nh, | |
507 | struct fib6_result *res, | |
508 | const struct in6_addr *saddr, | |
509 | int oif, int flags) | |
510 | { | |
511 | struct fib6_nh_dm_arg arg = { | |
512 | .net = net, | |
513 | .saddr = saddr, | |
514 | .oif = oif, | |
515 | .flags = flags, | |
516 | }; | |
517 | ||
518 | if (nexthop_is_blackhole(nh)) | |
519 | return NULL; | |
520 | ||
521 | if (nexthop_for_each_fib6_nh(nh, __rt6_nh_dev_match, &arg)) | |
522 | return arg.nh; | |
523 | ||
524 | return NULL; | |
525 | } | |
526 | ||
75ef7389 DA |
527 | static void rt6_device_match(struct net *net, struct fib6_result *res, |
528 | const struct in6_addr *saddr, int oif, int flags) | |
1da177e4 | 529 | { |
75ef7389 DA |
530 | struct fib6_info *f6i = res->f6i; |
531 | struct fib6_info *spf6i; | |
532 | struct fib6_nh *nh; | |
1da177e4 | 533 | |
75ef7389 | 534 | if (!oif && ipv6_addr_any(saddr)) { |
f88d8ea6 DA |
535 | if (unlikely(f6i->nh)) { |
536 | nh = nexthop_fib6_nh(f6i->nh); | |
537 | if (nexthop_is_blackhole(f6i->nh)) | |
538 | goto out_blackhole; | |
539 | } else { | |
540 | nh = f6i->fib6_nh; | |
541 | } | |
7d21fec9 DA |
542 | if (!(nh->fib_nh_flags & RTNH_F_DEAD)) |
543 | goto out; | |
75ef7389 | 544 | } |
dd3abc4e | 545 | |
75ef7389 | 546 | for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) { |
962b6803 DA |
547 | bool matched = false; |
548 | ||
549 | if (unlikely(spf6i->nh)) { | |
550 | nh = rt6_nh_dev_match(net, spf6i->nh, res, saddr, | |
551 | oif, flags); | |
552 | if (nh) | |
553 | matched = true; | |
554 | } else { | |
555 | nh = spf6i->fib6_nh; | |
556 | if (__rt6_device_match(net, nh, saddr, oif, flags)) | |
557 | matched = true; | |
558 | } | |
559 | if (matched) { | |
75ef7389 | 560 | res->f6i = spf6i; |
7d21fec9 | 561 | goto out; |
75ef7389 | 562 | } |
dd3abc4e | 563 | } |
1da177e4 | 564 | |
75ef7389 DA |
565 | if (oif && flags & RT6_LOOKUP_F_IFACE) { |
566 | res->f6i = net->ipv6.fib6_null_entry; | |
1cf844c7 | 567 | nh = res->f6i->fib6_nh; |
7d21fec9 | 568 | goto out; |
75ef7389 | 569 | } |
8067bb8c | 570 | |
f88d8ea6 DA |
571 | if (unlikely(f6i->nh)) { |
572 | nh = nexthop_fib6_nh(f6i->nh); | |
573 | if (nexthop_is_blackhole(f6i->nh)) | |
574 | goto out_blackhole; | |
575 | } else { | |
576 | nh = f6i->fib6_nh; | |
577 | } | |
578 | ||
7d21fec9 | 579 | if (nh->fib_nh_flags & RTNH_F_DEAD) { |
75ef7389 | 580 | res->f6i = net->ipv6.fib6_null_entry; |
1cf844c7 | 581 | nh = res->f6i->fib6_nh; |
75ef7389 | 582 | } |
7d21fec9 DA |
583 | out: |
584 | res->nh = nh; | |
585 | res->fib6_type = res->f6i->fib6_type; | |
586 | res->fib6_flags = res->f6i->fib6_flags; | |
f88d8ea6 DA |
587 | return; |
588 | ||
589 | out_blackhole: | |
590 | res->fib6_flags |= RTF_REJECT; | |
591 | res->fib6_type = RTN_BLACKHOLE; | |
592 | res->nh = nh; | |
1da177e4 LT |
593 | } |
594 | ||
27097255 | 595 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
596 | struct __rt6_probe_work { |
597 | struct work_struct work; | |
598 | struct in6_addr target; | |
599 | struct net_device *dev; | |
fb67510b | 600 | netdevice_tracker dev_tracker; |
c2f17e82 HFS |
601 | }; |
602 | ||
603 | static void rt6_probe_deferred(struct work_struct *w) | |
604 | { | |
605 | struct in6_addr mcaddr; | |
606 | struct __rt6_probe_work *work = | |
607 | container_of(w, struct __rt6_probe_work, work); | |
608 | ||
609 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
adc176c5 | 610 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0); |
d62607c3 | 611 | netdev_put(work->dev, &work->dev_tracker); |
662f5533 | 612 | kfree(work); |
c2f17e82 HFS |
613 | } |
614 | ||
cc3a86c8 | 615 | static void rt6_probe(struct fib6_nh *fib6_nh) |
27097255 | 616 | { |
f547fac6 | 617 | struct __rt6_probe_work *work = NULL; |
5e670d84 | 618 | const struct in6_addr *nh_gw; |
1bef4c22 | 619 | unsigned long last_probe; |
f2c31e32 | 620 | struct neighbour *neigh; |
5e670d84 | 621 | struct net_device *dev; |
f547fac6 | 622 | struct inet6_dev *idev; |
5e670d84 | 623 | |
27097255 YH |
624 | /* |
625 | * Okay, this does not seem to be appropriate | |
626 | * for now, however, we need to check if it | |
627 | * is really so; aka Router Reachability Probing. | |
628 | * | |
629 | * Router Reachability Probe MUST be rate-limited | |
630 | * to no more than one per minute. | |
631 | */ | |
004b3942 | 632 | if (!fib6_nh->fib_nh_gw_family) |
7ff74a59 | 633 | return; |
5e670d84 | 634 | |
cc3a86c8 DA |
635 | nh_gw = &fib6_nh->fib_nh_gw6; |
636 | dev = fib6_nh->fib_nh_dev; | |
09eed119 | 637 | rcu_read_lock(); |
1bef4c22 | 638 | last_probe = READ_ONCE(fib6_nh->last_probe); |
f547fac6 | 639 | idev = __in6_dev_get(dev); |
5e670d84 | 640 | neigh = __ipv6_neigh_lookup_noref(dev, nh_gw); |
2152caea | 641 | if (neigh) { |
b071af52 | 642 | if (READ_ONCE(neigh->nud_state) & NUD_VALID) |
8d6c31bf MKL |
643 | goto out; |
644 | ||
09eed119 | 645 | write_lock_bh(&neigh->lock); |
990edb42 MKL |
646 | if (!(neigh->nud_state & NUD_VALID) && |
647 | time_after(jiffies, | |
e248948a ED |
648 | neigh->updated + |
649 | READ_ONCE(idev->cnf.rtr_probe_interval))) { | |
990edb42 MKL |
650 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
651 | if (work) | |
652 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 653 | } |
09eed119 | 654 | write_unlock_bh(&neigh->lock); |
1bef4c22 | 655 | } else if (time_after(jiffies, last_probe + |
e248948a | 656 | READ_ONCE(idev->cnf.rtr_probe_interval))) { |
990edb42 | 657 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
f2c31e32 | 658 | } |
990edb42 | 659 | |
1bef4c22 ED |
660 | if (!work || cmpxchg(&fib6_nh->last_probe, |
661 | last_probe, jiffies) != last_probe) { | |
662 | kfree(work); | |
663 | } else { | |
990edb42 | 664 | INIT_WORK(&work->work, rt6_probe_deferred); |
5e670d84 | 665 | work->target = *nh_gw; |
d62607c3 | 666 | netdev_hold(dev, &work->dev_tracker, GFP_ATOMIC); |
5e670d84 | 667 | work->dev = dev; |
990edb42 MKL |
668 | schedule_work(&work->work); |
669 | } | |
670 | ||
8d6c31bf | 671 | out: |
09eed119 | 672 | rcu_read_unlock(); |
27097255 YH |
673 | } |
674 | #else | |
cc3a86c8 | 675 | static inline void rt6_probe(struct fib6_nh *fib6_nh) |
27097255 | 676 | { |
27097255 YH |
677 | } |
678 | #endif | |
679 | ||
1da177e4 | 680 | /* |
554cfb7e | 681 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 682 | */ |
1ba9a895 | 683 | static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh) |
1da177e4 | 684 | { |
afc154e9 | 685 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
5e670d84 | 686 | struct neighbour *neigh; |
f2c31e32 | 687 | |
09eed119 | 688 | rcu_read_lock(); |
1ba9a895 DA |
689 | neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev, |
690 | &fib6_nh->fib_nh_gw6); | |
145a3621 | 691 | if (neigh) { |
c486640a ED |
692 | u8 nud_state = READ_ONCE(neigh->nud_state); |
693 | ||
694 | if (nud_state & NUD_VALID) | |
afc154e9 | 695 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 696 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c486640a | 697 | else if (!(nud_state & NUD_FAILED)) |
afc154e9 | 698 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
699 | else |
700 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 701 | #endif |
afc154e9 HFS |
702 | } else { |
703 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 704 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 705 | } |
09eed119 | 706 | rcu_read_unlock(); |
145a3621 | 707 | |
a5a81f0b | 708 | return ret; |
1da177e4 LT |
709 | } |
710 | ||
702cea56 DA |
711 | static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif, |
712 | int strict) | |
1da177e4 | 713 | { |
6e1809a5 DA |
714 | int m = 0; |
715 | ||
716 | if (!oif || nh->fib_nh_dev->ifindex == oif) | |
717 | m = 2; | |
1ab1457c | 718 | |
77d16f45 | 719 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 720 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 | 721 | #ifdef CONFIG_IPV6_ROUTER_PREF |
702cea56 | 722 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2; |
ebacaaa0 | 723 | #endif |
1ba9a895 | 724 | if ((strict & RT6_LOOKUP_F_REACHABLE) && |
702cea56 | 725 | !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) { |
1ba9a895 | 726 | int n = rt6_check_neigh(nh); |
afc154e9 HFS |
727 | if (n < 0) |
728 | return n; | |
729 | } | |
554cfb7e YH |
730 | return m; |
731 | } | |
732 | ||
28679ed1 DA |
733 | static bool find_match(struct fib6_nh *nh, u32 fib6_flags, |
734 | int oif, int strict, int *mpri, bool *do_rr) | |
554cfb7e | 735 | { |
afc154e9 | 736 | bool match_do_rr = false; |
28679ed1 DA |
737 | bool rc = false; |
738 | int m; | |
35103d11 | 739 | |
28679ed1 | 740 | if (nh->fib_nh_flags & RTNH_F_DEAD) |
8067bb8c IS |
741 | goto out; |
742 | ||
28679ed1 DA |
743 | if (ip6_ignore_linkdown(nh->fib_nh_dev) && |
744 | nh->fib_nh_flags & RTNH_F_LINKDOWN && | |
d5d32e4b | 745 | !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE)) |
35103d11 | 746 | goto out; |
f11e6659 | 747 | |
28679ed1 | 748 | m = rt6_score_route(nh, fib6_flags, oif, strict); |
7e980569 | 749 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
750 | match_do_rr = true; |
751 | m = 0; /* lowest valid score */ | |
7e980569 | 752 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 753 | goto out; |
afc154e9 HFS |
754 | } |
755 | ||
756 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
28679ed1 | 757 | rt6_probe(nh); |
f11e6659 | 758 | |
7e980569 | 759 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 760 | if (m > *mpri) { |
afc154e9 | 761 | *do_rr = match_do_rr; |
f11e6659 | 762 | *mpri = m; |
28679ed1 | 763 | rc = true; |
f11e6659 | 764 | } |
f11e6659 | 765 | out: |
28679ed1 | 766 | return rc; |
f11e6659 DM |
767 | } |
768 | ||
17a5984e DA |
769 | struct fib6_nh_frl_arg { |
770 | u32 flags; | |
771 | int oif; | |
772 | int strict; | |
773 | int *mpri; | |
774 | bool *do_rr; | |
775 | struct fib6_nh *nh; | |
776 | }; | |
777 | ||
778 | static int rt6_nh_find_match(struct fib6_nh *nh, void *_arg) | |
779 | { | |
780 | struct fib6_nh_frl_arg *arg = _arg; | |
781 | ||
782 | arg->nh = nh; | |
783 | return find_match(nh, arg->flags, arg->oif, arg->strict, | |
784 | arg->mpri, arg->do_rr); | |
785 | } | |
786 | ||
b7bc4b6a | 787 | static void __find_rr_leaf(struct fib6_info *f6i_start, |
30c15f03 | 788 | struct fib6_info *nomatch, u32 metric, |
b7bc4b6a | 789 | struct fib6_result *res, struct fib6_info **cont, |
30c15f03 | 790 | int oif, int strict, bool *do_rr, int *mpri) |
f11e6659 | 791 | { |
b7bc4b6a | 792 | struct fib6_info *f6i; |
1da177e4 | 793 | |
b7bc4b6a DA |
794 | for (f6i = f6i_start; |
795 | f6i && f6i != nomatch; | |
796 | f6i = rcu_dereference(f6i->fib6_next)) { | |
17a5984e | 797 | bool matched = false; |
30c15f03 DA |
798 | struct fib6_nh *nh; |
799 | ||
b7bc4b6a DA |
800 | if (cont && f6i->fib6_metric != metric) { |
801 | *cont = f6i; | |
30c15f03 | 802 | return; |
9fbdcfaf SK |
803 | } |
804 | ||
b7bc4b6a | 805 | if (fib6_check_expired(f6i)) |
28679ed1 DA |
806 | continue; |
807 | ||
17a5984e DA |
808 | if (unlikely(f6i->nh)) { |
809 | struct fib6_nh_frl_arg arg = { | |
810 | .flags = f6i->fib6_flags, | |
811 | .oif = oif, | |
812 | .strict = strict, | |
813 | .mpri = mpri, | |
814 | .do_rr = do_rr | |
815 | }; | |
816 | ||
817 | if (nexthop_is_blackhole(f6i->nh)) { | |
818 | res->fib6_flags = RTF_REJECT; | |
819 | res->fib6_type = RTN_BLACKHOLE; | |
820 | res->f6i = f6i; | |
821 | res->nh = nexthop_fib6_nh(f6i->nh); | |
822 | return; | |
823 | } | |
824 | if (nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_find_match, | |
825 | &arg)) { | |
826 | matched = true; | |
827 | nh = arg.nh; | |
828 | } | |
829 | } else { | |
830 | nh = f6i->fib6_nh; | |
831 | if (find_match(nh, f6i->fib6_flags, oif, strict, | |
832 | mpri, do_rr)) | |
833 | matched = true; | |
834 | } | |
835 | if (matched) { | |
b7bc4b6a DA |
836 | res->f6i = f6i; |
837 | res->nh = nh; | |
7d21fec9 DA |
838 | res->fib6_flags = f6i->fib6_flags; |
839 | res->fib6_type = f6i->fib6_type; | |
b7bc4b6a | 840 | } |
9fbdcfaf | 841 | } |
30c15f03 | 842 | } |
9fbdcfaf | 843 | |
b7bc4b6a DA |
844 | static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf, |
845 | struct fib6_info *rr_head, int oif, int strict, | |
846 | bool *do_rr, struct fib6_result *res) | |
30c15f03 | 847 | { |
b7bc4b6a DA |
848 | u32 metric = rr_head->fib6_metric; |
849 | struct fib6_info *cont = NULL; | |
30c15f03 | 850 | int mpri = -1; |
9fbdcfaf | 851 | |
b7bc4b6a | 852 | __find_rr_leaf(rr_head, NULL, metric, res, &cont, |
30c15f03 | 853 | oif, strict, do_rr, &mpri); |
28679ed1 | 854 | |
b7bc4b6a | 855 | __find_rr_leaf(leaf, rr_head, metric, res, &cont, |
30c15f03 | 856 | oif, strict, do_rr, &mpri); |
9fbdcfaf | 857 | |
b7bc4b6a DA |
858 | if (res->f6i || !cont) |
859 | return; | |
9fbdcfaf | 860 | |
b7bc4b6a | 861 | __find_rr_leaf(cont, NULL, metric, res, NULL, |
30c15f03 | 862 | oif, strict, do_rr, &mpri); |
f11e6659 | 863 | } |
1da177e4 | 864 | |
b7bc4b6a DA |
865 | static void rt6_select(struct net *net, struct fib6_node *fn, int oif, |
866 | struct fib6_result *res, int strict) | |
f11e6659 | 867 | { |
8d1c802b | 868 | struct fib6_info *leaf = rcu_dereference(fn->leaf); |
b7bc4b6a | 869 | struct fib6_info *rt0; |
afc154e9 | 870 | bool do_rr = false; |
17ecf590 | 871 | int key_plen; |
1da177e4 | 872 | |
b7bc4b6a DA |
873 | /* make sure this function or its helpers sets f6i */ |
874 | res->f6i = NULL; | |
875 | ||
421842ed | 876 | if (!leaf || leaf == net->ipv6.fib6_null_entry) |
b7bc4b6a | 877 | goto out; |
8d1040e8 | 878 | |
66f5d6ce | 879 | rt0 = rcu_dereference(fn->rr_ptr); |
f11e6659 | 880 | if (!rt0) |
66f5d6ce | 881 | rt0 = leaf; |
1da177e4 | 882 | |
17ecf590 WW |
883 | /* Double check to make sure fn is not an intermediate node |
884 | * and fn->leaf does not points to its child's leaf | |
885 | * (This might happen if all routes under fn are deleted from | |
886 | * the tree and fib6_repair_tree() is called on the node.) | |
887 | */ | |
93c2fb25 | 888 | key_plen = rt0->fib6_dst.plen; |
17ecf590 | 889 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 DA |
890 | if (rt0->fib6_src.plen) |
891 | key_plen = rt0->fib6_src.plen; | |
17ecf590 WW |
892 | #endif |
893 | if (fn->fn_bit != key_plen) | |
b7bc4b6a | 894 | goto out; |
1da177e4 | 895 | |
b7bc4b6a | 896 | find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res); |
afc154e9 | 897 | if (do_rr) { |
8fb11a9a | 898 | struct fib6_info *next = rcu_dereference(rt0->fib6_next); |
f11e6659 | 899 | |
554cfb7e | 900 | /* no entries matched; do round-robin */ |
93c2fb25 | 901 | if (!next || next->fib6_metric != rt0->fib6_metric) |
8d1040e8 | 902 | next = leaf; |
f11e6659 | 903 | |
66f5d6ce | 904 | if (next != rt0) { |
93c2fb25 | 905 | spin_lock_bh(&leaf->fib6_table->tb6_lock); |
66f5d6ce | 906 | /* make sure next is not being deleted from the tree */ |
93c2fb25 | 907 | if (next->fib6_node) |
66f5d6ce | 908 | rcu_assign_pointer(fn->rr_ptr, next); |
93c2fb25 | 909 | spin_unlock_bh(&leaf->fib6_table->tb6_lock); |
66f5d6ce | 910 | } |
1da177e4 | 911 | } |
1da177e4 | 912 | |
b7bc4b6a DA |
913 | out: |
914 | if (!res->f6i) { | |
915 | res->f6i = net->ipv6.fib6_null_entry; | |
1cf844c7 | 916 | res->nh = res->f6i->fib6_nh; |
7d21fec9 DA |
917 | res->fib6_flags = res->f6i->fib6_flags; |
918 | res->fib6_type = res->f6i->fib6_type; | |
b7bc4b6a | 919 | } |
1da177e4 LT |
920 | } |
921 | ||
85bd05de | 922 | static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res) |
8b9df265 | 923 | { |
85bd05de DA |
924 | return (res->f6i->fib6_flags & RTF_NONEXTHOP) || |
925 | res->nh->fib_nh_gw_family; | |
8b9df265 MKL |
926 | } |
927 | ||
70ceb4f5 YH |
928 | #ifdef CONFIG_IPV6_ROUTE_INFO |
929 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 930 | const struct in6_addr *gwaddr) |
70ceb4f5 | 931 | { |
c346dca1 | 932 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
933 | struct route_info *rinfo = (struct route_info *) opt; |
934 | struct in6_addr prefix_buf, *prefix; | |
5eb902b8 | 935 | struct fib6_table *table; |
70ceb4f5 | 936 | unsigned int pref; |
4bed72e4 | 937 | unsigned long lifetime; |
8d1c802b | 938 | struct fib6_info *rt; |
70ceb4f5 YH |
939 | |
940 | if (len < sizeof(struct route_info)) { | |
941 | return -EINVAL; | |
942 | } | |
943 | ||
944 | /* Sanity check for prefix_len and length */ | |
945 | if (rinfo->length > 3) { | |
946 | return -EINVAL; | |
947 | } else if (rinfo->prefix_len > 128) { | |
948 | return -EINVAL; | |
949 | } else if (rinfo->prefix_len > 64) { | |
950 | if (rinfo->length < 2) { | |
951 | return -EINVAL; | |
952 | } | |
953 | } else if (rinfo->prefix_len > 0) { | |
954 | if (rinfo->length < 1) { | |
955 | return -EINVAL; | |
956 | } | |
957 | } | |
958 | ||
959 | pref = rinfo->route_pref; | |
960 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 961 | return -EINVAL; |
70ceb4f5 | 962 | |
4bed72e4 | 963 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
964 | |
965 | if (rinfo->length == 3) | |
966 | prefix = (struct in6_addr *)rinfo->prefix; | |
967 | else { | |
968 | /* this function is safe */ | |
969 | ipv6_addr_prefix(&prefix_buf, | |
970 | (struct in6_addr *)rinfo->prefix, | |
971 | rinfo->prefix_len); | |
972 | prefix = &prefix_buf; | |
973 | } | |
974 | ||
f104a567 | 975 | if (rinfo->prefix_len == 0) |
afb1d4b5 | 976 | rt = rt6_get_dflt_router(net, gwaddr, dev); |
f104a567 DJ |
977 | else |
978 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
830218c1 | 979 | gwaddr, dev); |
70ceb4f5 YH |
980 | |
981 | if (rt && !lifetime) { | |
11dd74b3 | 982 | ip6_del_rt(net, rt, false); |
70ceb4f5 YH |
983 | rt = NULL; |
984 | } | |
985 | ||
986 | if (!rt && lifetime) | |
830218c1 DA |
987 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
988 | dev, pref); | |
70ceb4f5 | 989 | else if (rt) |
93c2fb25 DA |
990 | rt->fib6_flags = RTF_ROUTEINFO | |
991 | (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
70ceb4f5 YH |
992 | |
993 | if (rt) { | |
5eb902b8 KFL |
994 | table = rt->fib6_table; |
995 | spin_lock_bh(&table->tb6_lock); | |
996 | ||
997 | if (!addrconf_finite_timeout(lifetime)) { | |
14895687 | 998 | fib6_clean_expires(rt); |
5eb902b8 KFL |
999 | fib6_remove_gc_list(rt); |
1000 | } else { | |
14895687 | 1001 | fib6_set_expires(rt, jiffies + HZ * lifetime); |
5eb902b8 KFL |
1002 | fib6_add_gc_list(rt); |
1003 | } | |
1004 | ||
1005 | spin_unlock_bh(&table->tb6_lock); | |
1716a961 | 1006 | |
93531c67 | 1007 | fib6_info_release(rt); |
70ceb4f5 YH |
1008 | } |
1009 | return 0; | |
1010 | } | |
1011 | #endif | |
1012 | ||
ae90d867 DA |
1013 | /* |
1014 | * Misc support functions | |
1015 | */ | |
1016 | ||
1017 | /* called with rcu_lock held */ | |
0d161581 | 1018 | static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res) |
ae90d867 | 1019 | { |
0d161581 | 1020 | struct net_device *dev = res->nh->fib_nh_dev; |
ae90d867 | 1021 | |
7d21fec9 | 1022 | if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) { |
ae90d867 DA |
1023 | /* for copies of local routes, dst->dev needs to be the |
1024 | * device if it is a master device, the master device if | |
1025 | * device is enslaved, and the loopback as the default | |
1026 | */ | |
1027 | if (netif_is_l3_slave(dev) && | |
7d21fec9 | 1028 | !rt6_need_strict(&res->f6i->fib6_dst.addr)) |
ae90d867 DA |
1029 | dev = l3mdev_master_dev_rcu(dev); |
1030 | else if (!netif_is_l3_master(dev)) | |
1031 | dev = dev_net(dev)->loopback_dev; | |
1032 | /* last case is netif_is_l3_master(dev) is true in which | |
1033 | * case we want dev returned to be dev | |
1034 | */ | |
1035 | } | |
1036 | ||
1037 | return dev; | |
1038 | } | |
1039 | ||
6edb3c96 DA |
1040 | static const int fib6_prop[RTN_MAX + 1] = { |
1041 | [RTN_UNSPEC] = 0, | |
1042 | [RTN_UNICAST] = 0, | |
1043 | [RTN_LOCAL] = 0, | |
1044 | [RTN_BROADCAST] = 0, | |
1045 | [RTN_ANYCAST] = 0, | |
1046 | [RTN_MULTICAST] = 0, | |
1047 | [RTN_BLACKHOLE] = -EINVAL, | |
1048 | [RTN_UNREACHABLE] = -EHOSTUNREACH, | |
1049 | [RTN_PROHIBIT] = -EACCES, | |
1050 | [RTN_THROW] = -EAGAIN, | |
1051 | [RTN_NAT] = -EINVAL, | |
1052 | [RTN_XRESOLVE] = -EINVAL, | |
1053 | }; | |
1054 | ||
1055 | static int ip6_rt_type_to_error(u8 fib6_type) | |
1056 | { | |
1057 | return fib6_prop[fib6_type]; | |
1058 | } | |
1059 | ||
8d1c802b | 1060 | static unsigned short fib6_info_dst_flags(struct fib6_info *rt) |
3b6761d1 DA |
1061 | { |
1062 | unsigned short flags = 0; | |
1063 | ||
1064 | if (rt->dst_nocount) | |
1065 | flags |= DST_NOCOUNT; | |
1066 | if (rt->dst_nopolicy) | |
1067 | flags |= DST_NOPOLICY; | |
3b6761d1 DA |
1068 | |
1069 | return flags; | |
1070 | } | |
1071 | ||
7d21fec9 | 1072 | static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type) |
6edb3c96 | 1073 | { |
7d21fec9 | 1074 | rt->dst.error = ip6_rt_type_to_error(fib6_type); |
6edb3c96 | 1075 | |
7d21fec9 | 1076 | switch (fib6_type) { |
6edb3c96 DA |
1077 | case RTN_BLACKHOLE: |
1078 | rt->dst.output = dst_discard_out; | |
1079 | rt->dst.input = dst_discard; | |
1080 | break; | |
1081 | case RTN_PROHIBIT: | |
1082 | rt->dst.output = ip6_pkt_prohibit_out; | |
1083 | rt->dst.input = ip6_pkt_prohibit; | |
1084 | break; | |
1085 | case RTN_THROW: | |
1086 | case RTN_UNREACHABLE: | |
1087 | default: | |
1088 | rt->dst.output = ip6_pkt_discard_out; | |
1089 | rt->dst.input = ip6_pkt_discard; | |
1090 | break; | |
1091 | } | |
1092 | } | |
1093 | ||
0d161581 | 1094 | static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res) |
6edb3c96 | 1095 | { |
7d21fec9 | 1096 | struct fib6_info *f6i = res->f6i; |
0d161581 | 1097 | |
7d21fec9 DA |
1098 | if (res->fib6_flags & RTF_REJECT) { |
1099 | ip6_rt_init_dst_reject(rt, res->fib6_type); | |
6edb3c96 DA |
1100 | return; |
1101 | } | |
1102 | ||
1103 | rt->dst.error = 0; | |
1104 | rt->dst.output = ip6_output; | |
1105 | ||
7d21fec9 | 1106 | if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) { |
6edb3c96 | 1107 | rt->dst.input = ip6_input; |
7d21fec9 | 1108 | } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) { |
6edb3c96 DA |
1109 | rt->dst.input = ip6_mc_input; |
1110 | } else { | |
1111 | rt->dst.input = ip6_forward; | |
1112 | } | |
1113 | ||
0d161581 DA |
1114 | if (res->nh->fib_nh_lws) { |
1115 | rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws); | |
6edb3c96 DA |
1116 | lwtunnel_set_redirect(&rt->dst); |
1117 | } | |
1118 | ||
1119 | rt->dst.lastuse = jiffies; | |
1120 | } | |
1121 | ||
e873e4b9 | 1122 | /* Caller must already hold reference to @from */ |
8d1c802b | 1123 | static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from) |
ae90d867 | 1124 | { |
ae90d867 | 1125 | rt->rt6i_flags &= ~RTF_EXPIRES; |
a68886a6 | 1126 | rcu_assign_pointer(rt->from, from); |
e1255ed4 | 1127 | ip_dst_init_metrics(&rt->dst, from->fib6_metrics); |
ae90d867 DA |
1128 | } |
1129 | ||
0d161581 DA |
1130 | /* Caller must already hold reference to f6i in result */ |
1131 | static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res) | |
ae90d867 | 1132 | { |
0d161581 DA |
1133 | const struct fib6_nh *nh = res->nh; |
1134 | const struct net_device *dev = nh->fib_nh_dev; | |
1135 | struct fib6_info *f6i = res->f6i; | |
dcd1f572 | 1136 | |
0d161581 | 1137 | ip6_rt_init_dst(rt, res); |
6edb3c96 | 1138 | |
0d161581 | 1139 | rt->rt6i_dst = f6i->fib6_dst; |
dcd1f572 | 1140 | rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL; |
7d21fec9 | 1141 | rt->rt6i_flags = res->fib6_flags; |
0d161581 DA |
1142 | if (nh->fib_nh_gw_family) { |
1143 | rt->rt6i_gateway = nh->fib_nh_gw6; | |
2b2450ca DA |
1144 | rt->rt6i_flags |= RTF_GATEWAY; |
1145 | } | |
0d161581 | 1146 | rt6_set_from(rt, f6i); |
ae90d867 | 1147 | #ifdef CONFIG_IPV6_SUBTREES |
0d161581 | 1148 | rt->rt6i_src = f6i->fib6_src; |
ae90d867 | 1149 | #endif |
ae90d867 DA |
1150 | } |
1151 | ||
a3c00e46 MKL |
1152 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
1153 | struct in6_addr *saddr) | |
1154 | { | |
66f5d6ce | 1155 | struct fib6_node *pn, *sn; |
a3c00e46 MKL |
1156 | while (1) { |
1157 | if (fn->fn_flags & RTN_TL_ROOT) | |
1158 | return NULL; | |
66f5d6ce WW |
1159 | pn = rcu_dereference(fn->parent); |
1160 | sn = FIB6_SUBTREE(pn); | |
1161 | if (sn && sn != fn) | |
6454743b | 1162 | fn = fib6_node_lookup(sn, NULL, saddr); |
a3c00e46 MKL |
1163 | else |
1164 | fn = pn; | |
1165 | if (fn->fn_flags & RTN_RTINFO) | |
1166 | return fn; | |
1167 | } | |
1168 | } | |
c71099ac | 1169 | |
10585b43 | 1170 | static bool ip6_hold_safe(struct net *net, struct rt6_info **prt) |
d3843fe5 WW |
1171 | { |
1172 | struct rt6_info *rt = *prt; | |
1173 | ||
1174 | if (dst_hold_safe(&rt->dst)) | |
1175 | return true; | |
10585b43 | 1176 | if (net) { |
d3843fe5 WW |
1177 | rt = net->ipv6.ip6_null_entry; |
1178 | dst_hold(&rt->dst); | |
1179 | } else { | |
1180 | rt = NULL; | |
1181 | } | |
1182 | *prt = rt; | |
1183 | return false; | |
1184 | } | |
1185 | ||
dec9b0e2 | 1186 | /* called with rcu_lock held */ |
9b6b35ab | 1187 | static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res) |
dec9b0e2 | 1188 | { |
9b6b35ab DA |
1189 | struct net_device *dev = res->nh->fib_nh_dev; |
1190 | struct fib6_info *f6i = res->f6i; | |
1191 | unsigned short flags; | |
dec9b0e2 DA |
1192 | struct rt6_info *nrt; |
1193 | ||
9b6b35ab | 1194 | if (!fib6_info_hold_safe(f6i)) |
1c87e79a | 1195 | goto fallback; |
e873e4b9 | 1196 | |
9b6b35ab | 1197 | flags = fib6_info_dst_flags(f6i); |
93531c67 | 1198 | nrt = ip6_dst_alloc(dev_net(dev), dev, flags); |
1c87e79a | 1199 | if (!nrt) { |
9b6b35ab | 1200 | fib6_info_release(f6i); |
1c87e79a XL |
1201 | goto fallback; |
1202 | } | |
dec9b0e2 | 1203 | |
0d161581 | 1204 | ip6_rt_copy_init(nrt, res); |
1c87e79a XL |
1205 | return nrt; |
1206 | ||
1207 | fallback: | |
1208 | nrt = dev_net(dev)->ipv6.ip6_null_entry; | |
1209 | dst_hold(&nrt->dst); | |
dec9b0e2 DA |
1210 | return nrt; |
1211 | } | |
1212 | ||
55cced4f | 1213 | INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_lookup(struct net *net, |
8ed67789 | 1214 | struct fib6_table *table, |
b75cc8f9 DA |
1215 | struct flowi6 *fl6, |
1216 | const struct sk_buff *skb, | |
1217 | int flags) | |
1da177e4 | 1218 | { |
b1d40991 | 1219 | struct fib6_result res = {}; |
1da177e4 | 1220 | struct fib6_node *fn; |
23fb93a4 | 1221 | struct rt6_info *rt; |
1da177e4 | 1222 | |
66f5d6ce | 1223 | rcu_read_lock(); |
6454743b | 1224 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac | 1225 | restart: |
b1d40991 DA |
1226 | res.f6i = rcu_dereference(fn->leaf); |
1227 | if (!res.f6i) | |
1228 | res.f6i = net->ipv6.fib6_null_entry; | |
af52a52c | 1229 | else |
75ef7389 DA |
1230 | rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif, |
1231 | flags); | |
af52a52c | 1232 | |
b1d40991 | 1233 | if (res.f6i == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
1234 | fn = fib6_backtrack(fn, &fl6->saddr); |
1235 | if (fn) | |
1236 | goto restart; | |
2b760fcf | 1237 | |
af52a52c DA |
1238 | rt = net->ipv6.ip6_null_entry; |
1239 | dst_hold(&rt->dst); | |
1240 | goto out; | |
f88d8ea6 DA |
1241 | } else if (res.fib6_flags & RTF_REJECT) { |
1242 | goto do_create; | |
af52a52c | 1243 | } |
d3843fe5 | 1244 | |
b1d40991 DA |
1245 | fib6_select_path(net, &res, fl6, fl6->flowi6_oif, |
1246 | fl6->flowi6_oif != 0, skb, flags); | |
1247 | ||
2b760fcf | 1248 | /* Search through exception table */ |
7e4b5128 | 1249 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 1250 | if (rt) { |
10585b43 | 1251 | if (ip6_hold_safe(net, &rt)) |
dec9b0e2 | 1252 | dst_use_noref(&rt->dst, jiffies); |
23fb93a4 | 1253 | } else { |
f88d8ea6 | 1254 | do_create: |
9b6b35ab | 1255 | rt = ip6_create_rt_rcu(&res); |
dec9b0e2 | 1256 | } |
b811580d | 1257 | |
af52a52c | 1258 | out: |
8ff2e5b2 | 1259 | trace_fib6_table_lookup(net, &res, table, fl6); |
af52a52c | 1260 | |
66f5d6ce | 1261 | rcu_read_unlock(); |
b811580d | 1262 | |
c71099ac | 1263 | return rt; |
c71099ac TG |
1264 | } |
1265 | ||
67ba4152 | 1266 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
b75cc8f9 | 1267 | const struct sk_buff *skb, int flags) |
ea6e574e | 1268 | { |
b75cc8f9 | 1269 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup); |
ea6e574e FW |
1270 | } |
1271 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
1272 | ||
9acd9f3a | 1273 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
b75cc8f9 DA |
1274 | const struct in6_addr *saddr, int oif, |
1275 | const struct sk_buff *skb, int strict) | |
c71099ac | 1276 | { |
4c9483b2 DM |
1277 | struct flowi6 fl6 = { |
1278 | .flowi6_oif = oif, | |
1279 | .daddr = *daddr, | |
c71099ac TG |
1280 | }; |
1281 | struct dst_entry *dst; | |
77d16f45 | 1282 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 1283 | |
adaa70bb | 1284 | if (saddr) { |
4c9483b2 | 1285 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
1286 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
1287 | } | |
1288 | ||
b75cc8f9 | 1289 | dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup); |
c71099ac | 1290 | if (dst->error == 0) |
e8dfd42c | 1291 | return dst_rt6_info(dst); |
c71099ac TG |
1292 | |
1293 | dst_release(dst); | |
1294 | ||
1da177e4 LT |
1295 | return NULL; |
1296 | } | |
7159039a YH |
1297 | EXPORT_SYMBOL(rt6_lookup); |
1298 | ||
c71099ac | 1299 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1cfb71ee WW |
1300 | * It takes new route entry, the addition fails by any reason the |
1301 | * route is released. | |
1302 | * Caller must hold dst before calling it. | |
1da177e4 LT |
1303 | */ |
1304 | ||
8d1c802b | 1305 | static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info, |
333c4301 | 1306 | struct netlink_ext_ack *extack) |
1da177e4 LT |
1307 | { |
1308 | int err; | |
c71099ac | 1309 | struct fib6_table *table; |
1da177e4 | 1310 | |
93c2fb25 | 1311 | table = rt->fib6_table; |
66f5d6ce | 1312 | spin_lock_bh(&table->tb6_lock); |
d4ead6b3 | 1313 | err = fib6_add(&table->tb6_root, rt, info, extack); |
66f5d6ce | 1314 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1315 | |
1316 | return err; | |
1317 | } | |
1318 | ||
8d1c802b | 1319 | int ip6_ins_rt(struct net *net, struct fib6_info *rt) |
40e22e8f | 1320 | { |
afb1d4b5 | 1321 | struct nl_info info = { .nl_net = net, }; |
e715b6d3 | 1322 | |
d4ead6b3 | 1323 | return __ip6_ins_rt(rt, &info, NULL); |
40e22e8f TG |
1324 | } |
1325 | ||
85bd05de | 1326 | static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res, |
8b9df265 MKL |
1327 | const struct in6_addr *daddr, |
1328 | const struct in6_addr *saddr) | |
1da177e4 | 1329 | { |
85bd05de | 1330 | struct fib6_info *f6i = res->f6i; |
4832c30d | 1331 | struct net_device *dev; |
1da177e4 LT |
1332 | struct rt6_info *rt; |
1333 | ||
1334 | /* | |
1335 | * Clone the route. | |
1336 | */ | |
1337 | ||
85bd05de | 1338 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1339 | return NULL; |
1340 | ||
0d161581 | 1341 | dev = ip6_rt_get_dev_rcu(res); |
93531c67 | 1342 | rt = ip6_dst_alloc(dev_net(dev), dev, 0); |
e873e4b9 | 1343 | if (!rt) { |
85bd05de | 1344 | fib6_info_release(f6i); |
83a09abd | 1345 | return NULL; |
e873e4b9 | 1346 | } |
83a09abd | 1347 | |
0d161581 | 1348 | ip6_rt_copy_init(rt, res); |
83a09abd | 1349 | rt->rt6i_flags |= RTF_CACHE; |
83a09abd MKL |
1350 | rt->rt6i_dst.addr = *daddr; |
1351 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 1352 | |
85bd05de DA |
1353 | if (!rt6_is_gw_or_nonexthop(res)) { |
1354 | if (f6i->fib6_dst.plen != 128 && | |
1355 | ipv6_addr_equal(&f6i->fib6_dst.addr, daddr)) | |
83a09abd | 1356 | rt->rt6i_flags |= RTF_ANYCAST; |
1da177e4 | 1357 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
1358 | if (rt->rt6i_src.plen && saddr) { |
1359 | rt->rt6i_src.addr = *saddr; | |
1360 | rt->rt6i_src.plen = 128; | |
8b9df265 | 1361 | } |
83a09abd | 1362 | #endif |
95a9a5ba | 1363 | } |
1da177e4 | 1364 | |
95a9a5ba YH |
1365 | return rt; |
1366 | } | |
1da177e4 | 1367 | |
db3fedee | 1368 | static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res) |
d52d3997 | 1369 | { |
db3fedee DA |
1370 | struct fib6_info *f6i = res->f6i; |
1371 | unsigned short flags = fib6_info_dst_flags(f6i); | |
4832c30d | 1372 | struct net_device *dev; |
d52d3997 MKL |
1373 | struct rt6_info *pcpu_rt; |
1374 | ||
db3fedee | 1375 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1376 | return NULL; |
1377 | ||
4832c30d | 1378 | rcu_read_lock(); |
0d161581 | 1379 | dev = ip6_rt_get_dev_rcu(res); |
d8882935 | 1380 | pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags | DST_NOCOUNT); |
4832c30d | 1381 | rcu_read_unlock(); |
e873e4b9 | 1382 | if (!pcpu_rt) { |
db3fedee | 1383 | fib6_info_release(f6i); |
d52d3997 | 1384 | return NULL; |
e873e4b9 | 1385 | } |
0d161581 | 1386 | ip6_rt_copy_init(pcpu_rt, res); |
d52d3997 | 1387 | pcpu_rt->rt6i_flags |= RTF_PCPU; |
8f34e53b DA |
1388 | |
1389 | if (f6i->nh) | |
1390 | pcpu_rt->sernum = rt_genid_ipv6(dev_net(dev)); | |
1391 | ||
d52d3997 MKL |
1392 | return pcpu_rt; |
1393 | } | |
1394 | ||
8f34e53b DA |
1395 | static bool rt6_is_valid(const struct rt6_info *rt6) |
1396 | { | |
1397 | return rt6->sernum == rt_genid_ipv6(dev_net(rt6->dst.dev)); | |
1398 | } | |
1399 | ||
66f5d6ce | 1400 | /* It should be called with rcu_read_lock() acquired */ |
db3fedee | 1401 | static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res) |
d52d3997 | 1402 | { |
c353071a | 1403 | struct rt6_info *pcpu_rt; |
d52d3997 | 1404 | |
c353071a | 1405 | pcpu_rt = this_cpu_read(*res->nh->rt6i_pcpu); |
d52d3997 | 1406 | |
8f34e53b DA |
1407 | if (pcpu_rt && pcpu_rt->sernum && !rt6_is_valid(pcpu_rt)) { |
1408 | struct rt6_info *prev, **p; | |
1409 | ||
1410 | p = this_cpu_ptr(res->nh->rt6i_pcpu); | |
1411 | prev = xchg(p, NULL); | |
1412 | if (prev) { | |
1413 | dst_dev_put(&prev->dst); | |
1414 | dst_release(&prev->dst); | |
1415 | } | |
1416 | ||
1417 | pcpu_rt = NULL; | |
1418 | } | |
1419 | ||
a73e4195 MKL |
1420 | return pcpu_rt; |
1421 | } | |
1422 | ||
afb1d4b5 | 1423 | static struct rt6_info *rt6_make_pcpu_route(struct net *net, |
db3fedee | 1424 | const struct fib6_result *res) |
a73e4195 MKL |
1425 | { |
1426 | struct rt6_info *pcpu_rt, *prev, **p; | |
d52d3997 | 1427 | |
db3fedee | 1428 | pcpu_rt = ip6_rt_pcpu_alloc(res); |
0e09edcc WW |
1429 | if (!pcpu_rt) |
1430 | return NULL; | |
d52d3997 | 1431 | |
f40b6ae2 | 1432 | p = this_cpu_ptr(res->nh->rt6i_pcpu); |
a94b9367 | 1433 | prev = cmpxchg(p, NULL, pcpu_rt); |
951f788a | 1434 | BUG_ON(prev); |
a94b9367 | 1435 | |
61fb0d01 ED |
1436 | if (res->f6i->fib6_destroying) { |
1437 | struct fib6_info *from; | |
1438 | ||
1439 | from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL); | |
1440 | fib6_info_release(from); | |
1441 | } | |
1442 | ||
d52d3997 MKL |
1443 | return pcpu_rt; |
1444 | } | |
1445 | ||
35732d01 WW |
1446 | /* exception hash table implementation |
1447 | */ | |
1448 | static DEFINE_SPINLOCK(rt6_exception_lock); | |
1449 | ||
1450 | /* Remove rt6_ex from hash table and free the memory | |
1451 | * Caller must hold rt6_exception_lock | |
1452 | */ | |
1453 | static void rt6_remove_exception(struct rt6_exception_bucket *bucket, | |
1454 | struct rt6_exception *rt6_ex) | |
1455 | { | |
f5b51fe8 | 1456 | struct fib6_info *from; |
b2427e67 | 1457 | struct net *net; |
81eb8447 | 1458 | |
35732d01 WW |
1459 | if (!bucket || !rt6_ex) |
1460 | return; | |
b2427e67 CIK |
1461 | |
1462 | net = dev_net(rt6_ex->rt6i->dst.dev); | |
f5b51fe8 PA |
1463 | net->ipv6.rt6_stats->fib_rt_cache--; |
1464 | ||
1465 | /* purge completely the exception to allow releasing the held resources: | |
1466 | * some [sk] cache may keep the dst around for unlimited time | |
1467 | */ | |
0e233874 | 1468 | from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL); |
f5b51fe8 PA |
1469 | fib6_info_release(from); |
1470 | dst_dev_put(&rt6_ex->rt6i->dst); | |
1471 | ||
35732d01 | 1472 | hlist_del_rcu(&rt6_ex->hlist); |
77634cc6 | 1473 | dst_release(&rt6_ex->rt6i->dst); |
35732d01 WW |
1474 | kfree_rcu(rt6_ex, rcu); |
1475 | WARN_ON_ONCE(!bucket->depth); | |
1476 | bucket->depth--; | |
1477 | } | |
1478 | ||
1479 | /* Remove oldest rt6_ex in bucket and free the memory | |
1480 | * Caller must hold rt6_exception_lock | |
1481 | */ | |
1482 | static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket) | |
1483 | { | |
1484 | struct rt6_exception *rt6_ex, *oldest = NULL; | |
1485 | ||
1486 | if (!bucket) | |
1487 | return; | |
1488 | ||
1489 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1490 | if (!oldest || time_before(rt6_ex->stamp, oldest->stamp)) | |
1491 | oldest = rt6_ex; | |
1492 | } | |
1493 | rt6_remove_exception(bucket, oldest); | |
1494 | } | |
1495 | ||
1496 | static u32 rt6_exception_hash(const struct in6_addr *dst, | |
1497 | const struct in6_addr *src) | |
1498 | { | |
49ecc2e9 | 1499 | static siphash_aligned_key_t rt6_exception_key; |
4785305c ED |
1500 | struct { |
1501 | struct in6_addr dst; | |
1502 | struct in6_addr src; | |
1503 | } __aligned(SIPHASH_ALIGNMENT) combined = { | |
1504 | .dst = *dst, | |
1505 | }; | |
1506 | u64 val; | |
35732d01 | 1507 | |
4785305c | 1508 | net_get_random_once(&rt6_exception_key, sizeof(rt6_exception_key)); |
35732d01 WW |
1509 | |
1510 | #ifdef CONFIG_IPV6_SUBTREES | |
1511 | if (src) | |
4785305c | 1512 | combined.src = *src; |
35732d01 | 1513 | #endif |
4785305c ED |
1514 | val = siphash(&combined, sizeof(combined), &rt6_exception_key); |
1515 | ||
1516 | return hash_64(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT); | |
35732d01 WW |
1517 | } |
1518 | ||
1519 | /* Helper function to find the cached rt in the hash table | |
1520 | * and update bucket pointer to point to the bucket for this | |
1521 | * (daddr, saddr) pair | |
1522 | * Caller must hold rt6_exception_lock | |
1523 | */ | |
1524 | static struct rt6_exception * | |
1525 | __rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket, | |
1526 | const struct in6_addr *daddr, | |
1527 | const struct in6_addr *saddr) | |
1528 | { | |
1529 | struct rt6_exception *rt6_ex; | |
1530 | u32 hval; | |
1531 | ||
1532 | if (!(*bucket) || !daddr) | |
1533 | return NULL; | |
1534 | ||
1535 | hval = rt6_exception_hash(daddr, saddr); | |
1536 | *bucket += hval; | |
1537 | ||
1538 | hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) { | |
1539 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1540 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1541 | ||
1542 | #ifdef CONFIG_IPV6_SUBTREES | |
1543 | if (matched && saddr) | |
1544 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1545 | #endif | |
1546 | if (matched) | |
1547 | return rt6_ex; | |
1548 | } | |
1549 | return NULL; | |
1550 | } | |
1551 | ||
1552 | /* Helper function to find the cached rt in the hash table | |
1553 | * and update bucket pointer to point to the bucket for this | |
1554 | * (daddr, saddr) pair | |
1555 | * Caller must hold rcu_read_lock() | |
1556 | */ | |
1557 | static struct rt6_exception * | |
1558 | __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket, | |
1559 | const struct in6_addr *daddr, | |
1560 | const struct in6_addr *saddr) | |
1561 | { | |
1562 | struct rt6_exception *rt6_ex; | |
1563 | u32 hval; | |
1564 | ||
1565 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1566 | ||
1567 | if (!(*bucket) || !daddr) | |
1568 | return NULL; | |
1569 | ||
1570 | hval = rt6_exception_hash(daddr, saddr); | |
1571 | *bucket += hval; | |
1572 | ||
1573 | hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) { | |
1574 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1575 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1576 | ||
1577 | #ifdef CONFIG_IPV6_SUBTREES | |
1578 | if (matched && saddr) | |
1579 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1580 | #endif | |
1581 | if (matched) | |
1582 | return rt6_ex; | |
1583 | } | |
1584 | return NULL; | |
1585 | } | |
1586 | ||
b748f260 | 1587 | static unsigned int fib6_mtu(const struct fib6_result *res) |
d4ead6b3 | 1588 | { |
b748f260 | 1589 | const struct fib6_nh *nh = res->nh; |
d4ead6b3 DA |
1590 | unsigned int mtu; |
1591 | ||
b748f260 DA |
1592 | if (res->f6i->fib6_pmtu) { |
1593 | mtu = res->f6i->fib6_pmtu; | |
dcd1f572 | 1594 | } else { |
b748f260 | 1595 | struct net_device *dev = nh->fib_nh_dev; |
dcd1f572 DA |
1596 | struct inet6_dev *idev; |
1597 | ||
1598 | rcu_read_lock(); | |
1599 | idev = __in6_dev_get(dev); | |
e7135f48 | 1600 | mtu = READ_ONCE(idev->cnf.mtu6); |
dcd1f572 DA |
1601 | rcu_read_unlock(); |
1602 | } | |
1603 | ||
d4ead6b3 DA |
1604 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
1605 | ||
b748f260 | 1606 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
d4ead6b3 DA |
1607 | } |
1608 | ||
cc5c073a DA |
1609 | #define FIB6_EXCEPTION_BUCKET_FLUSHED 0x1UL |
1610 | ||
1611 | /* used when the flushed bit is not relevant, only access to the bucket | |
1612 | * (ie., all bucket users except rt6_insert_exception); | |
1613 | * | |
1614 | * called under rcu lock; sometimes called with rt6_exception_lock held | |
1615 | */ | |
1616 | static | |
1617 | struct rt6_exception_bucket *fib6_nh_get_excptn_bucket(const struct fib6_nh *nh, | |
1618 | spinlock_t *lock) | |
1619 | { | |
1620 | struct rt6_exception_bucket *bucket; | |
1621 | ||
1622 | if (lock) | |
1623 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1624 | lockdep_is_held(lock)); | |
1625 | else | |
1626 | bucket = rcu_dereference(nh->rt6i_exception_bucket); | |
1627 | ||
1628 | /* remove bucket flushed bit if set */ | |
1629 | if (bucket) { | |
1630 | unsigned long p = (unsigned long)bucket; | |
1631 | ||
1632 | p &= ~FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1633 | bucket = (struct rt6_exception_bucket *)p; | |
1634 | } | |
1635 | ||
1636 | return bucket; | |
1637 | } | |
1638 | ||
1639 | static bool fib6_nh_excptn_bucket_flushed(struct rt6_exception_bucket *bucket) | |
1640 | { | |
1641 | unsigned long p = (unsigned long)bucket; | |
1642 | ||
1643 | return !!(p & FIB6_EXCEPTION_BUCKET_FLUSHED); | |
1644 | } | |
1645 | ||
1646 | /* called with rt6_exception_lock held */ | |
1647 | static void fib6_nh_excptn_bucket_set_flushed(struct fib6_nh *nh, | |
1648 | spinlock_t *lock) | |
1649 | { | |
1650 | struct rt6_exception_bucket *bucket; | |
1651 | unsigned long p; | |
1652 | ||
1653 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1654 | lockdep_is_held(lock)); | |
1655 | ||
1656 | p = (unsigned long)bucket; | |
1657 | p |= FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1658 | bucket = (struct rt6_exception_bucket *)p; | |
1659 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); | |
1660 | } | |
1661 | ||
35732d01 | 1662 | static int rt6_insert_exception(struct rt6_info *nrt, |
5012f0a5 | 1663 | const struct fib6_result *res) |
35732d01 | 1664 | { |
5e670d84 | 1665 | struct net *net = dev_net(nrt->dst.dev); |
35732d01 | 1666 | struct rt6_exception_bucket *bucket; |
cc5c073a | 1667 | struct fib6_info *f6i = res->f6i; |
35732d01 WW |
1668 | struct in6_addr *src_key = NULL; |
1669 | struct rt6_exception *rt6_ex; | |
cc5c073a | 1670 | struct fib6_nh *nh = res->nh; |
a00df2ca | 1671 | int max_depth; |
35732d01 WW |
1672 | int err = 0; |
1673 | ||
35732d01 WW |
1674 | spin_lock_bh(&rt6_exception_lock); |
1675 | ||
cc5c073a DA |
1676 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, |
1677 | lockdep_is_held(&rt6_exception_lock)); | |
35732d01 WW |
1678 | if (!bucket) { |
1679 | bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket), | |
1680 | GFP_ATOMIC); | |
1681 | if (!bucket) { | |
1682 | err = -ENOMEM; | |
1683 | goto out; | |
1684 | } | |
cc5c073a DA |
1685 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); |
1686 | } else if (fib6_nh_excptn_bucket_flushed(bucket)) { | |
1687 | err = -EINVAL; | |
1688 | goto out; | |
35732d01 WW |
1689 | } |
1690 | ||
1691 | #ifdef CONFIG_IPV6_SUBTREES | |
5012f0a5 | 1692 | /* fib6_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1693 | * and exception table is indexed by a hash of |
5012f0a5 | 1694 | * both fib6_dst and fib6_src. |
35732d01 | 1695 | * Otherwise, the exception table is indexed by |
5012f0a5 | 1696 | * a hash of only fib6_dst. |
35732d01 | 1697 | */ |
5012f0a5 | 1698 | if (f6i->fib6_src.plen) |
35732d01 WW |
1699 | src_key = &nrt->rt6i_src.addr; |
1700 | #endif | |
5012f0a5 | 1701 | /* rt6_mtu_change() might lower mtu on f6i. |
f5bbe7ee | 1702 | * Only insert this exception route if its mtu |
5012f0a5 | 1703 | * is less than f6i's mtu value. |
f5bbe7ee | 1704 | */ |
b748f260 | 1705 | if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) { |
f5bbe7ee WW |
1706 | err = -EINVAL; |
1707 | goto out; | |
1708 | } | |
60006a48 | 1709 | |
35732d01 WW |
1710 | rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr, |
1711 | src_key); | |
1712 | if (rt6_ex) | |
1713 | rt6_remove_exception(bucket, rt6_ex); | |
1714 | ||
1715 | rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC); | |
1716 | if (!rt6_ex) { | |
1717 | err = -ENOMEM; | |
1718 | goto out; | |
1719 | } | |
1720 | rt6_ex->rt6i = nrt; | |
1721 | rt6_ex->stamp = jiffies; | |
35732d01 WW |
1722 | hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain); |
1723 | bucket->depth++; | |
81eb8447 | 1724 | net->ipv6.rt6_stats->fib_rt_cache++; |
35732d01 | 1725 | |
a00df2ca | 1726 | /* Randomize max depth to avoid some side channels attacks. */ |
8032bf12 | 1727 | max_depth = FIB6_MAX_DEPTH + get_random_u32_below(FIB6_MAX_DEPTH); |
a00df2ca | 1728 | while (bucket->depth > max_depth) |
35732d01 WW |
1729 | rt6_exception_remove_oldest(bucket); |
1730 | ||
1731 | out: | |
1732 | spin_unlock_bh(&rt6_exception_lock); | |
1733 | ||
1734 | /* Update fn->fn_sernum to invalidate all cached dst */ | |
b886d5f2 | 1735 | if (!err) { |
5012f0a5 DA |
1736 | spin_lock_bh(&f6i->fib6_table->tb6_lock); |
1737 | fib6_update_sernum(net, f6i); | |
1738 | spin_unlock_bh(&f6i->fib6_table->tb6_lock); | |
b886d5f2 PA |
1739 | fib6_force_start_gc(net); |
1740 | } | |
35732d01 WW |
1741 | |
1742 | return err; | |
1743 | } | |
1744 | ||
c0b220cf | 1745 | static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from) |
35732d01 WW |
1746 | { |
1747 | struct rt6_exception_bucket *bucket; | |
1748 | struct rt6_exception *rt6_ex; | |
1749 | struct hlist_node *tmp; | |
1750 | int i; | |
1751 | ||
1752 | spin_lock_bh(&rt6_exception_lock); | |
35732d01 | 1753 | |
cc5c073a | 1754 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
35732d01 WW |
1755 | if (!bucket) |
1756 | goto out; | |
1757 | ||
cc5c073a DA |
1758 | /* Prevent rt6_insert_exception() to recreate the bucket list */ |
1759 | if (!from) | |
1760 | fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock); | |
1761 | ||
35732d01 | 1762 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { |
cc5c073a DA |
1763 | hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) { |
1764 | if (!from || | |
1765 | rcu_access_pointer(rt6_ex->rt6i->from) == from) | |
1766 | rt6_remove_exception(bucket, rt6_ex); | |
1767 | } | |
1768 | WARN_ON_ONCE(!from && bucket->depth); | |
35732d01 WW |
1769 | bucket++; |
1770 | } | |
35732d01 WW |
1771 | out: |
1772 | spin_unlock_bh(&rt6_exception_lock); | |
1773 | } | |
1774 | ||
e659ba31 DA |
1775 | static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg) |
1776 | { | |
1777 | struct fib6_info *f6i = arg; | |
1778 | ||
1779 | fib6_nh_flush_exceptions(nh, f6i); | |
1780 | ||
1781 | return 0; | |
1782 | } | |
1783 | ||
c0b220cf DA |
1784 | void rt6_flush_exceptions(struct fib6_info *f6i) |
1785 | { | |
e659ba31 DA |
1786 | if (f6i->nh) |
1787 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions, | |
1788 | f6i); | |
1789 | else | |
1790 | fib6_nh_flush_exceptions(f6i->fib6_nh, f6i); | |
c0b220cf DA |
1791 | } |
1792 | ||
35732d01 WW |
1793 | /* Find cached rt in the hash table inside passed in rt |
1794 | * Caller has to hold rcu_read_lock() | |
1795 | */ | |
7e4b5128 | 1796 | static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res, |
510e2ced WW |
1797 | const struct in6_addr *daddr, |
1798 | const struct in6_addr *saddr) | |
35732d01 | 1799 | { |
510e2ced | 1800 | const struct in6_addr *src_key = NULL; |
35732d01 | 1801 | struct rt6_exception_bucket *bucket; |
35732d01 | 1802 | struct rt6_exception *rt6_ex; |
7e4b5128 | 1803 | struct rt6_info *ret = NULL; |
35732d01 | 1804 | |
35732d01 | 1805 | #ifdef CONFIG_IPV6_SUBTREES |
7e4b5128 | 1806 | /* fib6i_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1807 | * and exception table is indexed by a hash of |
7e4b5128 | 1808 | * both fib6_dst and fib6_src. |
510e2ced WW |
1809 | * However, the src addr used to create the hash |
1810 | * might not be exactly the passed in saddr which | |
1811 | * is a /128 addr from the flow. | |
1812 | * So we need to use f6i->fib6_src to redo lookup | |
1813 | * if the passed in saddr does not find anything. | |
1814 | * (See the logic in ip6_rt_cache_alloc() on how | |
1815 | * rt->rt6i_src is updated.) | |
35732d01 | 1816 | */ |
7e4b5128 | 1817 | if (res->f6i->fib6_src.plen) |
35732d01 | 1818 | src_key = saddr; |
510e2ced | 1819 | find_ex: |
35732d01 | 1820 | #endif |
cc5c073a | 1821 | bucket = fib6_nh_get_excptn_bucket(res->nh, NULL); |
35732d01 WW |
1822 | rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key); |
1823 | ||
1824 | if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i)) | |
7e4b5128 | 1825 | ret = rt6_ex->rt6i; |
35732d01 | 1826 | |
510e2ced WW |
1827 | #ifdef CONFIG_IPV6_SUBTREES |
1828 | /* Use fib6_src as src_key and redo lookup */ | |
1829 | if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) { | |
1830 | src_key = &res->f6i->fib6_src.addr; | |
1831 | goto find_ex; | |
1832 | } | |
1833 | #endif | |
1834 | ||
7e4b5128 | 1835 | return ret; |
35732d01 WW |
1836 | } |
1837 | ||
1838 | /* Remove the passed in cached rt from the hash table that contains it */ | |
cc5c073a | 1839 | static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1840 | const struct rt6_info *rt) |
35732d01 | 1841 | { |
c0b220cf | 1842 | const struct in6_addr *src_key = NULL; |
35732d01 | 1843 | struct rt6_exception_bucket *bucket; |
35732d01 WW |
1844 | struct rt6_exception *rt6_ex; |
1845 | int err; | |
1846 | ||
cc5c073a | 1847 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
35732d01 WW |
1848 | return -ENOENT; |
1849 | ||
1850 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a DA |
1851 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
1852 | ||
35732d01 | 1853 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1854 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1855 | * and exception table is indexed by a hash of | |
1856 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1857 | * Otherwise, the exception table is indexed by |
1858 | * a hash of only rt6i_dst. | |
1859 | */ | |
c0b220cf | 1860 | if (plen) |
35732d01 WW |
1861 | src_key = &rt->rt6i_src.addr; |
1862 | #endif | |
1863 | rt6_ex = __rt6_find_exception_spinlock(&bucket, | |
1864 | &rt->rt6i_dst.addr, | |
1865 | src_key); | |
1866 | if (rt6_ex) { | |
1867 | rt6_remove_exception(bucket, rt6_ex); | |
1868 | err = 0; | |
1869 | } else { | |
1870 | err = -ENOENT; | |
1871 | } | |
1872 | ||
1873 | spin_unlock_bh(&rt6_exception_lock); | |
1874 | return err; | |
1875 | } | |
1876 | ||
e659ba31 DA |
1877 | struct fib6_nh_excptn_arg { |
1878 | struct rt6_info *rt; | |
1879 | int plen; | |
1880 | }; | |
1881 | ||
1882 | static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg) | |
1883 | { | |
1884 | struct fib6_nh_excptn_arg *arg = _arg; | |
1885 | int err; | |
1886 | ||
1887 | err = fib6_nh_remove_exception(nh, arg->plen, arg->rt); | |
1888 | if (err == 0) | |
1889 | return 1; | |
1890 | ||
1891 | return 0; | |
1892 | } | |
1893 | ||
c0b220cf DA |
1894 | static int rt6_remove_exception_rt(struct rt6_info *rt) |
1895 | { | |
1896 | struct fib6_info *from; | |
1897 | ||
1898 | from = rcu_dereference(rt->from); | |
cc5c073a | 1899 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) |
c0b220cf DA |
1900 | return -EINVAL; |
1901 | ||
e659ba31 DA |
1902 | if (from->nh) { |
1903 | struct fib6_nh_excptn_arg arg = { | |
1904 | .rt = rt, | |
1905 | .plen = from->fib6_src.plen | |
1906 | }; | |
1907 | int rc; | |
1908 | ||
1909 | /* rc = 1 means an entry was found */ | |
1910 | rc = nexthop_for_each_fib6_nh(from->nh, | |
1911 | rt6_nh_remove_exception_rt, | |
1912 | &arg); | |
1913 | return rc ? 0 : -ENOENT; | |
1914 | } | |
1915 | ||
1cf844c7 | 1916 | return fib6_nh_remove_exception(from->fib6_nh, |
cc5c073a | 1917 | from->fib6_src.plen, rt); |
c0b220cf DA |
1918 | } |
1919 | ||
35732d01 WW |
1920 | /* Find rt6_ex which contains the passed in rt cache and |
1921 | * refresh its stamp | |
1922 | */ | |
cc5c073a | 1923 | static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1924 | const struct rt6_info *rt) |
35732d01 | 1925 | { |
c0b220cf | 1926 | const struct in6_addr *src_key = NULL; |
35732d01 | 1927 | struct rt6_exception_bucket *bucket; |
35732d01 | 1928 | struct rt6_exception *rt6_ex; |
193f3685 | 1929 | |
cc5c073a | 1930 | bucket = fib6_nh_get_excptn_bucket(nh, NULL); |
35732d01 | 1931 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1932 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1933 | * and exception table is indexed by a hash of | |
1934 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1935 | * Otherwise, the exception table is indexed by |
1936 | * a hash of only rt6i_dst. | |
1937 | */ | |
c0b220cf | 1938 | if (plen) |
35732d01 WW |
1939 | src_key = &rt->rt6i_src.addr; |
1940 | #endif | |
cc5c073a | 1941 | rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key); |
35732d01 WW |
1942 | if (rt6_ex) |
1943 | rt6_ex->stamp = jiffies; | |
c0b220cf DA |
1944 | } |
1945 | ||
e659ba31 DA |
1946 | struct fib6_nh_match_arg { |
1947 | const struct net_device *dev; | |
1948 | const struct in6_addr *gw; | |
1949 | struct fib6_nh *match; | |
1950 | }; | |
1951 | ||
1952 | /* determine if fib6_nh has given device and gateway */ | |
1953 | static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg) | |
1954 | { | |
1955 | struct fib6_nh_match_arg *arg = _arg; | |
1956 | ||
1957 | if (arg->dev != nh->fib_nh_dev || | |
1958 | (arg->gw && !nh->fib_nh_gw_family) || | |
1959 | (!arg->gw && nh->fib_nh_gw_family) || | |
1960 | (arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6))) | |
1961 | return 0; | |
1962 | ||
1963 | arg->match = nh; | |
1964 | ||
1965 | /* found a match, break the loop */ | |
1966 | return 1; | |
1967 | } | |
1968 | ||
c0b220cf DA |
1969 | static void rt6_update_exception_stamp_rt(struct rt6_info *rt) |
1970 | { | |
1971 | struct fib6_info *from; | |
e659ba31 | 1972 | struct fib6_nh *fib6_nh; |
35732d01 | 1973 | |
c0b220cf DA |
1974 | rcu_read_lock(); |
1975 | ||
1976 | from = rcu_dereference(rt->from); | |
1977 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) | |
1978 | goto unlock; | |
1979 | ||
e659ba31 DA |
1980 | if (from->nh) { |
1981 | struct fib6_nh_match_arg arg = { | |
1982 | .dev = rt->dst.dev, | |
1983 | .gw = &rt->rt6i_gateway, | |
1984 | }; | |
1985 | ||
1986 | nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg); | |
1987 | ||
1988 | if (!arg.match) | |
cff6a327 | 1989 | goto unlock; |
e659ba31 DA |
1990 | fib6_nh = arg.match; |
1991 | } else { | |
1992 | fib6_nh = from->fib6_nh; | |
1993 | } | |
1994 | fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt); | |
193f3685 | 1995 | unlock: |
35732d01 WW |
1996 | rcu_read_unlock(); |
1997 | } | |
1998 | ||
e9fa1495 SB |
1999 | static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev, |
2000 | struct rt6_info *rt, int mtu) | |
2001 | { | |
2002 | /* If the new MTU is lower than the route PMTU, this new MTU will be the | |
2003 | * lowest MTU in the path: always allow updating the route PMTU to | |
2004 | * reflect PMTU decreases. | |
2005 | * | |
2006 | * If the new MTU is higher, and the route PMTU is equal to the local | |
2007 | * MTU, this means the old MTU is the lowest in the path, so allow | |
2008 | * updating it: if other nodes now have lower MTUs, PMTU discovery will | |
2009 | * handle this. | |
2010 | */ | |
2011 | ||
2012 | if (dst_mtu(&rt->dst) >= mtu) | |
2013 | return true; | |
2014 | ||
2015 | if (dst_mtu(&rt->dst) == idev->cnf.mtu6) | |
2016 | return true; | |
2017 | ||
2018 | return false; | |
2019 | } | |
2020 | ||
2021 | static void rt6_exceptions_update_pmtu(struct inet6_dev *idev, | |
cc5c073a | 2022 | const struct fib6_nh *nh, int mtu) |
f5bbe7ee WW |
2023 | { |
2024 | struct rt6_exception_bucket *bucket; | |
2025 | struct rt6_exception *rt6_ex; | |
2026 | int i; | |
2027 | ||
cc5c073a | 2028 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
e9fa1495 SB |
2029 | if (!bucket) |
2030 | return; | |
2031 | ||
2032 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2033 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
2034 | struct rt6_info *entry = rt6_ex->rt6i; | |
2035 | ||
2036 | /* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected | |
d4ead6b3 | 2037 | * route), the metrics of its rt->from have already |
e9fa1495 SB |
2038 | * been updated. |
2039 | */ | |
d4ead6b3 | 2040 | if (dst_metric_raw(&entry->dst, RTAX_MTU) && |
e9fa1495 | 2041 | rt6_mtu_change_route_allowed(idev, entry, mtu)) |
d4ead6b3 | 2042 | dst_metric_set(&entry->dst, RTAX_MTU, mtu); |
f5bbe7ee | 2043 | } |
e9fa1495 | 2044 | bucket++; |
f5bbe7ee WW |
2045 | } |
2046 | } | |
2047 | ||
b16cb459 WW |
2048 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) |
2049 | ||
cc5c073a DA |
2050 | static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh, |
2051 | const struct in6_addr *gateway) | |
b16cb459 WW |
2052 | { |
2053 | struct rt6_exception_bucket *bucket; | |
2054 | struct rt6_exception *rt6_ex; | |
2055 | struct hlist_node *tmp; | |
2056 | int i; | |
2057 | ||
cc5c073a | 2058 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
b16cb459 WW |
2059 | return; |
2060 | ||
2061 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 2062 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
b16cb459 WW |
2063 | if (bucket) { |
2064 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2065 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
2066 | &bucket->chain, hlist) { | |
2067 | struct rt6_info *entry = rt6_ex->rt6i; | |
2068 | ||
2069 | if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) == | |
2070 | RTF_CACHE_GATEWAY && | |
2071 | ipv6_addr_equal(gateway, | |
2072 | &entry->rt6i_gateway)) { | |
2073 | rt6_remove_exception(bucket, rt6_ex); | |
2074 | } | |
2075 | } | |
2076 | bucket++; | |
2077 | } | |
2078 | } | |
2079 | ||
2080 | spin_unlock_bh(&rt6_exception_lock); | |
2081 | } | |
2082 | ||
c757faa8 WW |
2083 | static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket, |
2084 | struct rt6_exception *rt6_ex, | |
2085 | struct fib6_gc_args *gc_args, | |
2086 | unsigned long now) | |
2087 | { | |
2088 | struct rt6_info *rt = rt6_ex->rt6i; | |
2089 | ||
1859bac0 PA |
2090 | /* we are pruning and obsoleting aged-out and non gateway exceptions |
2091 | * even if others have still references to them, so that on next | |
2092 | * dst_check() such references can be dropped. | |
2093 | * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when | |
2094 | * expired, independently from their aging, as per RFC 8201 section 4 | |
2095 | */ | |
31afeb42 WW |
2096 | if (!(rt->rt6i_flags & RTF_EXPIRES)) { |
2097 | if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) { | |
20df28fb | 2098 | pr_debug("aging clone %p\n", rt); |
31afeb42 WW |
2099 | rt6_remove_exception(bucket, rt6_ex); |
2100 | return; | |
2101 | } | |
2102 | } else if (time_after(jiffies, rt->dst.expires)) { | |
20df28fb | 2103 | pr_debug("purging expired route %p\n", rt); |
c757faa8 WW |
2104 | rt6_remove_exception(bucket, rt6_ex); |
2105 | return; | |
31afeb42 WW |
2106 | } |
2107 | ||
2108 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
c757faa8 | 2109 | struct neighbour *neigh; |
c757faa8 | 2110 | |
1bfa26ff | 2111 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); |
1bfa26ff | 2112 | |
b7a320c3 | 2113 | if (!(neigh && (neigh->flags & NTF_ROUTER))) { |
20df28fb BL |
2114 | pr_debug("purging route %p via non-router but gateway\n", |
2115 | rt); | |
c757faa8 WW |
2116 | rt6_remove_exception(bucket, rt6_ex); |
2117 | return; | |
2118 | } | |
2119 | } | |
31afeb42 | 2120 | |
c757faa8 WW |
2121 | gc_args->more++; |
2122 | } | |
2123 | ||
cc5c073a | 2124 | static void fib6_nh_age_exceptions(const struct fib6_nh *nh, |
c0b220cf DA |
2125 | struct fib6_gc_args *gc_args, |
2126 | unsigned long now) | |
c757faa8 WW |
2127 | { |
2128 | struct rt6_exception_bucket *bucket; | |
2129 | struct rt6_exception *rt6_ex; | |
2130 | struct hlist_node *tmp; | |
2131 | int i; | |
2132 | ||
cc5c073a | 2133 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
c757faa8 WW |
2134 | return; |
2135 | ||
1bfa26ff ED |
2136 | rcu_read_lock_bh(); |
2137 | spin_lock(&rt6_exception_lock); | |
cc5c073a | 2138 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
c757faa8 WW |
2139 | if (bucket) { |
2140 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2141 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
2142 | &bucket->chain, hlist) { | |
2143 | rt6_age_examine_exception(bucket, rt6_ex, | |
2144 | gc_args, now); | |
2145 | } | |
2146 | bucket++; | |
2147 | } | |
2148 | } | |
1bfa26ff ED |
2149 | spin_unlock(&rt6_exception_lock); |
2150 | rcu_read_unlock_bh(); | |
c757faa8 WW |
2151 | } |
2152 | ||
e659ba31 DA |
2153 | struct fib6_nh_age_excptn_arg { |
2154 | struct fib6_gc_args *gc_args; | |
2155 | unsigned long now; | |
2156 | }; | |
2157 | ||
2158 | static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg) | |
2159 | { | |
2160 | struct fib6_nh_age_excptn_arg *arg = _arg; | |
2161 | ||
2162 | fib6_nh_age_exceptions(nh, arg->gc_args, arg->now); | |
2163 | return 0; | |
2164 | } | |
2165 | ||
cc5c073a | 2166 | void rt6_age_exceptions(struct fib6_info *f6i, |
c0b220cf DA |
2167 | struct fib6_gc_args *gc_args, |
2168 | unsigned long now) | |
2169 | { | |
e659ba31 DA |
2170 | if (f6i->nh) { |
2171 | struct fib6_nh_age_excptn_arg arg = { | |
2172 | .gc_args = gc_args, | |
2173 | .now = now | |
2174 | }; | |
2175 | ||
2176 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions, | |
2177 | &arg); | |
2178 | } else { | |
2179 | fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now); | |
2180 | } | |
c0b220cf DA |
2181 | } |
2182 | ||
1d053da9 | 2183 | /* must be called with rcu lock held */ |
effda4dd DA |
2184 | int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif, |
2185 | struct flowi6 *fl6, struct fib6_result *res, int strict) | |
1da177e4 | 2186 | { |
367efcb9 | 2187 | struct fib6_node *fn, *saved_fn; |
1da177e4 | 2188 | |
6454743b | 2189 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 2190 | saved_fn = fn; |
1da177e4 | 2191 | |
a3c00e46 | 2192 | redo_rt6_select: |
effda4dd DA |
2193 | rt6_select(net, fn, oif, res, strict); |
2194 | if (res->f6i == net->ipv6.fib6_null_entry) { | |
a3c00e46 MKL |
2195 | fn = fib6_backtrack(fn, &fl6->saddr); |
2196 | if (fn) | |
2197 | goto redo_rt6_select; | |
367efcb9 MKL |
2198 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
2199 | /* also consider unreachable route */ | |
2200 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
2201 | fn = saved_fn; | |
2202 | goto redo_rt6_select; | |
367efcb9 | 2203 | } |
a3c00e46 MKL |
2204 | } |
2205 | ||
effda4dd | 2206 | trace_fib6_table_lookup(net, res, table, fl6); |
fb9de91e | 2207 | |
effda4dd | 2208 | return 0; |
1d053da9 DA |
2209 | } |
2210 | ||
2211 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, | |
2212 | int oif, struct flowi6 *fl6, | |
2213 | const struct sk_buff *skb, int flags) | |
2214 | { | |
b1d40991 | 2215 | struct fib6_result res = {}; |
0e09edcc | 2216 | struct rt6_info *rt = NULL; |
1d053da9 DA |
2217 | int strict = 0; |
2218 | ||
0e09edcc WW |
2219 | WARN_ON_ONCE((flags & RT6_LOOKUP_F_DST_NOREF) && |
2220 | !rcu_read_lock_held()); | |
2221 | ||
1d053da9 DA |
2222 | strict |= flags & RT6_LOOKUP_F_IFACE; |
2223 | strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE; | |
32f75417 | 2224 | if (READ_ONCE(net->ipv6.devconf_all->forwarding) == 0) |
1d053da9 DA |
2225 | strict |= RT6_LOOKUP_F_REACHABLE; |
2226 | ||
2227 | rcu_read_lock(); | |
2228 | ||
effda4dd | 2229 | fib6_table_lookup(net, table, oif, fl6, &res, strict); |
0e09edcc WW |
2230 | if (res.f6i == net->ipv6.fib6_null_entry) |
2231 | goto out; | |
23fb93a4 | 2232 | |
b1d40991 | 2233 | fib6_select_path(net, &res, fl6, oif, false, skb, strict); |
d83009d4 | 2234 | |
23fb93a4 | 2235 | /*Search through exception table */ |
7e4b5128 | 2236 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 2237 | if (rt) { |
0e09edcc | 2238 | goto out; |
3da59bd9 | 2239 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
b1d40991 | 2240 | !res.nh->fib_nh_gw_family)) { |
3da59bd9 MKL |
2241 | /* Create a RTF_CACHE clone which will not be |
2242 | * owned by the fib6 tree. It is for the special case where | |
2243 | * the daddr in the skb during the neighbor look-up is different | |
2244 | * from the fl6->daddr used to look-up route here. | |
2245 | */ | |
0e09edcc | 2246 | rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL); |
c71099ac | 2247 | |
0e09edcc WW |
2248 | if (rt) { |
2249 | /* 1 refcnt is taken during ip6_rt_cache_alloc(). | |
2250 | * As rt6_uncached_list_add() does not consume refcnt, | |
2251 | * this refcnt is always returned to the caller even | |
2252 | * if caller sets RT6_LOOKUP_F_DST_NOREF flag. | |
1cfb71ee | 2253 | */ |
0e09edcc | 2254 | rt6_uncached_list_add(rt); |
0e09edcc | 2255 | rcu_read_unlock(); |
b811580d | 2256 | |
0e09edcc WW |
2257 | return rt; |
2258 | } | |
d52d3997 MKL |
2259 | } else { |
2260 | /* Get a percpu copy */ | |
951f788a | 2261 | local_bh_disable(); |
0e09edcc | 2262 | rt = rt6_get_pcpu_route(&res); |
d52d3997 | 2263 | |
0e09edcc WW |
2264 | if (!rt) |
2265 | rt = rt6_make_pcpu_route(net, &res); | |
93531c67 | 2266 | |
951f788a | 2267 | local_bh_enable(); |
d52d3997 | 2268 | } |
0e09edcc WW |
2269 | out: |
2270 | if (!rt) | |
2271 | rt = net->ipv6.ip6_null_entry; | |
2272 | if (!(flags & RT6_LOOKUP_F_DST_NOREF)) | |
2273 | ip6_hold_safe(net, &rt); | |
2274 | rcu_read_unlock(); | |
2275 | ||
2276 | return rt; | |
1da177e4 | 2277 | } |
9ff74384 | 2278 | EXPORT_SYMBOL_GPL(ip6_pol_route); |
1da177e4 | 2279 | |
55cced4f | 2280 | INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_input(struct net *net, |
b75cc8f9 DA |
2281 | struct fib6_table *table, |
2282 | struct flowi6 *fl6, | |
2283 | const struct sk_buff *skb, | |
2284 | int flags) | |
4acad72d | 2285 | { |
b75cc8f9 | 2286 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags); |
4acad72d PE |
2287 | } |
2288 | ||
d409b847 MB |
2289 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
2290 | struct net_device *dev, | |
b75cc8f9 DA |
2291 | struct flowi6 *fl6, |
2292 | const struct sk_buff *skb, | |
2293 | int flags) | |
72331bc0 SL |
2294 | { |
2295 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
2296 | flags |= RT6_LOOKUP_F_IFACE; | |
2297 | ||
b75cc8f9 | 2298 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input); |
72331bc0 | 2299 | } |
d409b847 | 2300 | EXPORT_SYMBOL_GPL(ip6_route_input_lookup); |
72331bc0 | 2301 | |
23aebdac | 2302 | static void ip6_multipath_l3_keys(const struct sk_buff *skb, |
5e5d6fed RP |
2303 | struct flow_keys *keys, |
2304 | struct flow_keys *flkeys) | |
23aebdac JS |
2305 | { |
2306 | const struct ipv6hdr *outer_iph = ipv6_hdr(skb); | |
2307 | const struct ipv6hdr *key_iph = outer_iph; | |
5e5d6fed | 2308 | struct flow_keys *_flkeys = flkeys; |
23aebdac JS |
2309 | const struct ipv6hdr *inner_iph; |
2310 | const struct icmp6hdr *icmph; | |
2311 | struct ipv6hdr _inner_iph; | |
cea67a2d | 2312 | struct icmp6hdr _icmph; |
23aebdac JS |
2313 | |
2314 | if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6)) | |
2315 | goto out; | |
2316 | ||
cea67a2d ED |
2317 | icmph = skb_header_pointer(skb, skb_transport_offset(skb), |
2318 | sizeof(_icmph), &_icmph); | |
2319 | if (!icmph) | |
2320 | goto out; | |
2321 | ||
54074f1d | 2322 | if (!icmpv6_is_err(icmph->icmp6_type)) |
23aebdac JS |
2323 | goto out; |
2324 | ||
2325 | inner_iph = skb_header_pointer(skb, | |
2326 | skb_transport_offset(skb) + sizeof(*icmph), | |
2327 | sizeof(_inner_iph), &_inner_iph); | |
2328 | if (!inner_iph) | |
2329 | goto out; | |
2330 | ||
2331 | key_iph = inner_iph; | |
5e5d6fed | 2332 | _flkeys = NULL; |
23aebdac | 2333 | out: |
5e5d6fed RP |
2334 | if (_flkeys) { |
2335 | keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src; | |
2336 | keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst; | |
2337 | keys->tags.flow_label = _flkeys->tags.flow_label; | |
2338 | keys->basic.ip_proto = _flkeys->basic.ip_proto; | |
2339 | } else { | |
2340 | keys->addrs.v6addrs.src = key_iph->saddr; | |
2341 | keys->addrs.v6addrs.dst = key_iph->daddr; | |
fa1be7e0 | 2342 | keys->tags.flow_label = ip6_flowlabel(key_iph); |
5e5d6fed RP |
2343 | keys->basic.ip_proto = key_iph->nexthdr; |
2344 | } | |
23aebdac JS |
2345 | } |
2346 | ||
73c2c5cb IS |
2347 | static u32 rt6_multipath_custom_hash_outer(const struct net *net, |
2348 | const struct sk_buff *skb, | |
2349 | bool *p_has_inner) | |
2350 | { | |
2351 | u32 hash_fields = ip6_multipath_hash_fields(net); | |
2352 | struct flow_keys keys, hash_keys; | |
2353 | ||
2354 | if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK)) | |
2355 | return 0; | |
2356 | ||
2357 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2358 | skb_flow_dissect_flow_keys(skb, &keys, FLOW_DISSECTOR_F_STOP_AT_ENCAP); | |
2359 | ||
2360 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2361 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP) | |
2362 | hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src; | |
2363 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP) | |
2364 | hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst; | |
2365 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO) | |
2366 | hash_keys.basic.ip_proto = keys.basic.ip_proto; | |
2367 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_FLOWLABEL) | |
2368 | hash_keys.tags.flow_label = keys.tags.flow_label; | |
2369 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT) | |
2370 | hash_keys.ports.src = keys.ports.src; | |
2371 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT) | |
2372 | hash_keys.ports.dst = keys.ports.dst; | |
2373 | ||
2374 | *p_has_inner = !!(keys.control.flags & FLOW_DIS_ENCAPSULATION); | |
2375 | return flow_hash_from_keys(&hash_keys); | |
2376 | } | |
2377 | ||
2378 | static u32 rt6_multipath_custom_hash_inner(const struct net *net, | |
2379 | const struct sk_buff *skb, | |
2380 | bool has_inner) | |
2381 | { | |
2382 | u32 hash_fields = ip6_multipath_hash_fields(net); | |
2383 | struct flow_keys keys, hash_keys; | |
2384 | ||
2385 | /* We assume the packet carries an encapsulation, but if none was | |
2386 | * encountered during dissection of the outer flow, then there is no | |
2387 | * point in calling the flow dissector again. | |
2388 | */ | |
2389 | if (!has_inner) | |
2390 | return 0; | |
2391 | ||
2392 | if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_MASK)) | |
2393 | return 0; | |
2394 | ||
2395 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2396 | skb_flow_dissect_flow_keys(skb, &keys, 0); | |
2397 | ||
2398 | if (!(keys.control.flags & FLOW_DIS_ENCAPSULATION)) | |
2399 | return 0; | |
2400 | ||
2401 | if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) { | |
2402 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2403 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP) | |
2404 | hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; | |
2405 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP) | |
2406 | hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; | |
2407 | } else if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) { | |
2408 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2409 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP) | |
2410 | hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src; | |
2411 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP) | |
2412 | hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst; | |
2413 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL) | |
2414 | hash_keys.tags.flow_label = keys.tags.flow_label; | |
2415 | } | |
2416 | ||
2417 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO) | |
2418 | hash_keys.basic.ip_proto = keys.basic.ip_proto; | |
2419 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT) | |
2420 | hash_keys.ports.src = keys.ports.src; | |
2421 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT) | |
2422 | hash_keys.ports.dst = keys.ports.dst; | |
2423 | ||
2424 | return flow_hash_from_keys(&hash_keys); | |
2425 | } | |
2426 | ||
2427 | static u32 rt6_multipath_custom_hash_skb(const struct net *net, | |
2428 | const struct sk_buff *skb) | |
2429 | { | |
2430 | u32 mhash, mhash_inner; | |
2431 | bool has_inner = true; | |
2432 | ||
2433 | mhash = rt6_multipath_custom_hash_outer(net, skb, &has_inner); | |
2434 | mhash_inner = rt6_multipath_custom_hash_inner(net, skb, has_inner); | |
2435 | ||
2436 | return jhash_2words(mhash, mhash_inner, 0); | |
2437 | } | |
2438 | ||
2439 | static u32 rt6_multipath_custom_hash_fl6(const struct net *net, | |
2440 | const struct flowi6 *fl6) | |
2441 | { | |
2442 | u32 hash_fields = ip6_multipath_hash_fields(net); | |
2443 | struct flow_keys hash_keys; | |
2444 | ||
2445 | if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK)) | |
2446 | return 0; | |
2447 | ||
2448 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2449 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2450 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP) | |
2451 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2452 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP) | |
2453 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2454 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO) | |
2455 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2456 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_FLOWLABEL) | |
2457 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); | |
2458 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT) | |
2459 | hash_keys.ports.src = fl6->fl6_sport; | |
2460 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT) | |
2461 | hash_keys.ports.dst = fl6->fl6_dport; | |
2462 | ||
2463 | return flow_hash_from_keys(&hash_keys); | |
2464 | } | |
2465 | ||
23aebdac | 2466 | /* if skb is set it will be used and fl6 can be NULL */ |
b4bac172 DA |
2467 | u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6, |
2468 | const struct sk_buff *skb, struct flow_keys *flkeys) | |
23aebdac JS |
2469 | { |
2470 | struct flow_keys hash_keys; | |
b95b6e07 | 2471 | u32 mhash = 0; |
23aebdac | 2472 | |
bbfa047a | 2473 | switch (ip6_multipath_hash_policy(net)) { |
b4bac172 DA |
2474 | case 0: |
2475 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2476 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2477 | if (skb) { | |
2478 | ip6_multipath_l3_keys(skb, &hash_keys, flkeys); | |
2479 | } else { | |
2480 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2481 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
fa1be7e0 | 2482 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); |
b4bac172 DA |
2483 | hash_keys.basic.ip_proto = fl6->flowi6_proto; |
2484 | } | |
b95b6e07 | 2485 | mhash = flow_hash_from_keys(&hash_keys); |
b4bac172 DA |
2486 | break; |
2487 | case 1: | |
2488 | if (skb) { | |
2489 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; | |
2490 | struct flow_keys keys; | |
2491 | ||
2492 | /* short-circuit if we already have L4 hash present */ | |
2493 | if (skb->l4_hash) | |
2494 | return skb_get_hash_raw(skb) >> 1; | |
2495 | ||
2496 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2497 | ||
13fdb940 | 2498 | if (!flkeys) { |
b4bac172 DA |
2499 | skb_flow_dissect_flow_keys(skb, &keys, flag); |
2500 | flkeys = &keys; | |
2501 | } | |
2502 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2503 | hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src; | |
2504 | hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst; | |
2505 | hash_keys.ports.src = flkeys->ports.src; | |
2506 | hash_keys.ports.dst = flkeys->ports.dst; | |
2507 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
2508 | } else { | |
2509 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2510 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2511 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2512 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2513 | hash_keys.ports.src = fl6->fl6_sport; | |
2514 | hash_keys.ports.dst = fl6->fl6_dport; | |
2515 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2516 | } | |
b95b6e07 | 2517 | mhash = flow_hash_from_keys(&hash_keys); |
b4bac172 | 2518 | break; |
d8f74f09 SS |
2519 | case 2: |
2520 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2521 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2522 | if (skb) { | |
2523 | struct flow_keys keys; | |
2524 | ||
2525 | if (!flkeys) { | |
2526 | skb_flow_dissect_flow_keys(skb, &keys, 0); | |
2527 | flkeys = &keys; | |
2528 | } | |
2529 | ||
2530 | /* Inner can be v4 or v6 */ | |
2531 | if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) { | |
2532 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2533 | hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src; | |
2534 | hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst; | |
2535 | } else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) { | |
2536 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2537 | hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src; | |
2538 | hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst; | |
2539 | hash_keys.tags.flow_label = flkeys->tags.flow_label; | |
2540 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
2541 | } else { | |
2542 | /* Same as case 0 */ | |
2543 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2544 | ip6_multipath_l3_keys(skb, &hash_keys, flkeys); | |
2545 | } | |
2546 | } else { | |
2547 | /* Same as case 0 */ | |
2548 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2549 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2550 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2551 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); | |
2552 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2553 | } | |
b95b6e07 | 2554 | mhash = flow_hash_from_keys(&hash_keys); |
d8f74f09 | 2555 | break; |
73c2c5cb IS |
2556 | case 3: |
2557 | if (skb) | |
2558 | mhash = rt6_multipath_custom_hash_skb(net, skb); | |
2559 | else | |
2560 | mhash = rt6_multipath_custom_hash_fl6(net, fl6); | |
2561 | break; | |
23aebdac JS |
2562 | } |
2563 | ||
9a2a537a | 2564 | return mhash >> 1; |
23aebdac JS |
2565 | } |
2566 | ||
67f415dd | 2567 | /* Called with rcu held */ |
c71099ac TG |
2568 | void ip6_route_input(struct sk_buff *skb) |
2569 | { | |
b71d1d42 | 2570 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 2571 | struct net *net = dev_net(skb->dev); |
67f415dd | 2572 | int flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_DST_NOREF; |
904af04d | 2573 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 2574 | struct flowi6 fl6 = { |
e0d56fdd | 2575 | .flowi6_iif = skb->dev->ifindex, |
4c9483b2 DM |
2576 | .daddr = iph->daddr, |
2577 | .saddr = iph->saddr, | |
6502ca52 | 2578 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
2579 | .flowi6_mark = skb->mark, |
2580 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 2581 | }; |
5e5d6fed | 2582 | struct flow_keys *flkeys = NULL, _flkeys; |
adaa70bb | 2583 | |
904af04d | 2584 | tun_info = skb_tunnel_info(skb); |
46fa062a | 2585 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 2586 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
5e5d6fed RP |
2587 | |
2588 | if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys)) | |
2589 | flkeys = &_flkeys; | |
2590 | ||
23aebdac | 2591 | if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6)) |
b4bac172 | 2592 | fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys); |
06e9d040 | 2593 | skb_dst_drop(skb); |
67f415dd WW |
2594 | skb_dst_set_noref(skb, ip6_route_input_lookup(net, skb->dev, |
2595 | &fl6, skb, flags)); | |
c71099ac TG |
2596 | } |
2597 | ||
55cced4f | 2598 | INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_output(struct net *net, |
b75cc8f9 DA |
2599 | struct fib6_table *table, |
2600 | struct flowi6 *fl6, | |
2601 | const struct sk_buff *skb, | |
2602 | int flags) | |
1da177e4 | 2603 | { |
b75cc8f9 | 2604 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags); |
c71099ac TG |
2605 | } |
2606 | ||
90317bcd GN |
2607 | static struct dst_entry *ip6_route_output_flags_noref(struct net *net, |
2608 | const struct sock *sk, | |
2609 | struct flowi6 *fl6, | |
2610 | int flags) | |
c71099ac | 2611 | { |
d46a9d67 | 2612 | bool any_src; |
c71099ac | 2613 | |
3ede0bbc RS |
2614 | if (ipv6_addr_type(&fl6->daddr) & |
2615 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) { | |
4c1feac5 DA |
2616 | struct dst_entry *dst; |
2617 | ||
7d9e5f42 | 2618 | /* This function does not take refcnt on the dst */ |
4c1feac5 DA |
2619 | dst = l3mdev_link_scope_lookup(net, fl6); |
2620 | if (dst) | |
2621 | return dst; | |
2622 | } | |
ca254490 | 2623 | |
1fb9489b | 2624 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 2625 | |
7d9e5f42 | 2626 | flags |= RT6_LOOKUP_F_DST_NOREF; |
d46a9d67 | 2627 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 2628 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 2629 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 2630 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 2631 | |
d46a9d67 | 2632 | if (!any_src) |
adaa70bb | 2633 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 | 2634 | else if (sk) |
fa17a6d8 | 2635 | flags |= rt6_srcprefs2flags(READ_ONCE(inet6_sk(sk)->srcprefs)); |
adaa70bb | 2636 | |
b75cc8f9 | 2637 | return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output); |
1da177e4 | 2638 | } |
7d9e5f42 WW |
2639 | |
2640 | struct dst_entry *ip6_route_output_flags(struct net *net, | |
2641 | const struct sock *sk, | |
2642 | struct flowi6 *fl6, | |
2643 | int flags) | |
2644 | { | |
13fdb940 SK |
2645 | struct dst_entry *dst; |
2646 | struct rt6_info *rt6; | |
7d9e5f42 | 2647 | |
13fdb940 SK |
2648 | rcu_read_lock(); |
2649 | dst = ip6_route_output_flags_noref(net, sk, fl6, flags); | |
e8dfd42c | 2650 | rt6 = dst_rt6_info(dst); |
13fdb940 | 2651 | /* For dst cached in uncached_list, refcnt is already taken. */ |
d288a162 | 2652 | if (list_empty(&rt6->dst.rt_uncached) && !dst_hold_safe(dst)) { |
13fdb940 SK |
2653 | dst = &net->ipv6.ip6_null_entry->dst; |
2654 | dst_hold(dst); | |
2655 | } | |
2656 | rcu_read_unlock(); | |
7d9e5f42 | 2657 | |
13fdb940 | 2658 | return dst; |
7d9e5f42 | 2659 | } |
6f21c96a | 2660 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 2661 | |
2774c131 | 2662 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2663 | { |
e8dfd42c | 2664 | struct rt6_info *rt, *ort = dst_rt6_info(dst_orig); |
1dbe3252 | 2665 | struct net_device *loopback_dev = net->loopback_dev; |
14e50e57 DM |
2666 | struct dst_entry *new = NULL; |
2667 | ||
762c8dc7 | 2668 | rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, |
62cf27e5 | 2669 | DST_OBSOLETE_DEAD, 0); |
14e50e57 | 2670 | if (rt) { |
0a1f5962 | 2671 | rt6_info_init(rt); |
81eb8447 | 2672 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
8104891b | 2673 | |
0a1f5962 | 2674 | new = &rt->dst; |
14e50e57 | 2675 | new->__use = 1; |
352e512c | 2676 | new->input = dst_discard; |
ede2059d | 2677 | new->output = dst_discard_out; |
14e50e57 | 2678 | |
0a1f5962 | 2679 | dst_copy_metrics(new, &ort->dst); |
14e50e57 | 2680 | |
1dbe3252 | 2681 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
4e3fd7a0 | 2682 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 2683 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
2684 | |
2685 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
2686 | #ifdef CONFIG_IPV6_SUBTREES | |
2687 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
2688 | #endif | |
14e50e57 DM |
2689 | } |
2690 | ||
69ead7af DM |
2691 | dst_release(dst_orig); |
2692 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 2693 | } |
14e50e57 | 2694 | |
1da177e4 LT |
2695 | /* |
2696 | * Destination cache support functions | |
2697 | */ | |
2698 | ||
8d1c802b | 2699 | static bool fib6_check(struct fib6_info *f6i, u32 cookie) |
4b32b5ad | 2700 | { |
93531c67 DA |
2701 | u32 rt_cookie = 0; |
2702 | ||
8ae86971 | 2703 | if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie) |
93531c67 DA |
2704 | return false; |
2705 | ||
2706 | if (fib6_check_expired(f6i)) | |
2707 | return false; | |
2708 | ||
2709 | return true; | |
4b32b5ad MKL |
2710 | } |
2711 | ||
a68886a6 DA |
2712 | static struct dst_entry *rt6_check(struct rt6_info *rt, |
2713 | struct fib6_info *from, | |
2714 | u32 cookie) | |
3da59bd9 | 2715 | { |
36143645 | 2716 | u32 rt_cookie = 0; |
c5cff856 | 2717 | |
49d05fe2 | 2718 | if (!from || !fib6_get_cookie_safe(from, &rt_cookie) || |
93531c67 | 2719 | rt_cookie != cookie) |
3da59bd9 MKL |
2720 | return NULL; |
2721 | ||
2722 | if (rt6_check_expired(rt)) | |
2723 | return NULL; | |
2724 | ||
2725 | return &rt->dst; | |
2726 | } | |
2727 | ||
a68886a6 DA |
2728 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, |
2729 | struct fib6_info *from, | |
2730 | u32 cookie) | |
3da59bd9 | 2731 | { |
5973fb1e MKL |
2732 | if (!__rt6_check_expired(rt) && |
2733 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
a68886a6 | 2734 | fib6_check(from, cookie)) |
3da59bd9 MKL |
2735 | return &rt->dst; |
2736 | else | |
2737 | return NULL; | |
2738 | } | |
2739 | ||
bbd807df BV |
2740 | INDIRECT_CALLABLE_SCOPE struct dst_entry *ip6_dst_check(struct dst_entry *dst, |
2741 | u32 cookie) | |
1da177e4 | 2742 | { |
a87b7dc9 | 2743 | struct dst_entry *dst_ret; |
a68886a6 | 2744 | struct fib6_info *from; |
1da177e4 LT |
2745 | struct rt6_info *rt; |
2746 | ||
e8dfd42c | 2747 | rt = dst_rt6_info(dst); |
a87b7dc9 | 2748 | |
8f34e53b DA |
2749 | if (rt->sernum) |
2750 | return rt6_is_valid(rt) ? dst : NULL; | |
2751 | ||
a87b7dc9 | 2752 | rcu_read_lock(); |
1da177e4 | 2753 | |
6f3118b5 ND |
2754 | /* All IPV6 dsts are created with ->obsolete set to the value |
2755 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
2756 | * into this function always. | |
2757 | */ | |
e3bc10bd | 2758 | |
a68886a6 | 2759 | from = rcu_dereference(rt->from); |
4b32b5ad | 2760 | |
a68886a6 | 2761 | if (from && (rt->rt6i_flags & RTF_PCPU || |
d288a162 | 2762 | unlikely(!list_empty(&rt->dst.rt_uncached)))) |
a68886a6 | 2763 | dst_ret = rt6_dst_from_check(rt, from, cookie); |
3da59bd9 | 2764 | else |
a68886a6 | 2765 | dst_ret = rt6_check(rt, from, cookie); |
a87b7dc9 DA |
2766 | |
2767 | rcu_read_unlock(); | |
2768 | ||
2769 | return dst_ret; | |
1da177e4 | 2770 | } |
9c97921a | 2771 | EXPORT_INDIRECT_CALLABLE(ip6_dst_check); |
1da177e4 LT |
2772 | |
2773 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
2774 | { | |
e8dfd42c | 2775 | struct rt6_info *rt = dst_rt6_info(dst); |
1da177e4 LT |
2776 | |
2777 | if (rt) { | |
54c1a859 | 2778 | if (rt->rt6i_flags & RTF_CACHE) { |
c3c14da0 | 2779 | rcu_read_lock(); |
54c1a859 | 2780 | if (rt6_check_expired(rt)) { |
93531c67 | 2781 | rt6_remove_exception_rt(rt); |
54c1a859 YH |
2782 | dst = NULL; |
2783 | } | |
c3c14da0 | 2784 | rcu_read_unlock(); |
54c1a859 | 2785 | } else { |
1da177e4 | 2786 | dst_release(dst); |
54c1a859 YH |
2787 | dst = NULL; |
2788 | } | |
1da177e4 | 2789 | } |
54c1a859 | 2790 | return dst; |
1da177e4 LT |
2791 | } |
2792 | ||
2793 | static void ip6_link_failure(struct sk_buff *skb) | |
2794 | { | |
2795 | struct rt6_info *rt; | |
2796 | ||
3ffe533c | 2797 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 2798 | |
e8dfd42c | 2799 | rt = dst_rt6_info(skb_dst(skb)); |
1da177e4 | 2800 | if (rt) { |
8a14e46f | 2801 | rcu_read_lock(); |
1eb4f758 | 2802 | if (rt->rt6i_flags & RTF_CACHE) { |
761f6026 | 2803 | rt6_remove_exception_rt(rt); |
c5cff856 | 2804 | } else { |
a68886a6 | 2805 | struct fib6_info *from; |
c5cff856 WW |
2806 | struct fib6_node *fn; |
2807 | ||
a68886a6 DA |
2808 | from = rcu_dereference(rt->from); |
2809 | if (from) { | |
2810 | fn = rcu_dereference(from->fib6_node); | |
2811 | if (fn && (rt->rt6i_flags & RTF_DEFAULT)) | |
aafc2e32 | 2812 | WRITE_ONCE(fn->fn_sernum, -1); |
a68886a6 | 2813 | } |
1eb4f758 | 2814 | } |
8a14e46f | 2815 | rcu_read_unlock(); |
1da177e4 LT |
2816 | } |
2817 | } | |
2818 | ||
6a3e030f DA |
2819 | static void rt6_update_expires(struct rt6_info *rt0, int timeout) |
2820 | { | |
a68886a6 DA |
2821 | if (!(rt0->rt6i_flags & RTF_EXPIRES)) { |
2822 | struct fib6_info *from; | |
2823 | ||
2824 | rcu_read_lock(); | |
2825 | from = rcu_dereference(rt0->from); | |
2826 | if (from) | |
2827 | rt0->dst.expires = from->expires; | |
2828 | rcu_read_unlock(); | |
2829 | } | |
6a3e030f DA |
2830 | |
2831 | dst_set_expires(&rt0->dst, timeout); | |
2832 | rt0->rt6i_flags |= RTF_EXPIRES; | |
2833 | } | |
2834 | ||
45e4fd26 MKL |
2835 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
2836 | { | |
2837 | struct net *net = dev_net(rt->dst.dev); | |
2838 | ||
d4ead6b3 | 2839 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
45e4fd26 | 2840 | rt->rt6i_flags |= RTF_MODIFIED; |
45e4fd26 MKL |
2841 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); |
2842 | } | |
2843 | ||
0d3f6d29 MKL |
2844 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
2845 | { | |
2846 | return !(rt->rt6i_flags & RTF_CACHE) && | |
1490ed2a | 2847 | (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from)); |
0d3f6d29 MKL |
2848 | } |
2849 | ||
45e4fd26 | 2850 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
bd085ef6 HL |
2851 | const struct ipv6hdr *iph, u32 mtu, |
2852 | bool confirm_neigh) | |
1da177e4 | 2853 | { |
0dec879f | 2854 | const struct in6_addr *daddr, *saddr; |
e8dfd42c | 2855 | struct rt6_info *rt6 = dst_rt6_info(dst); |
1da177e4 | 2856 | |
09454fd0 MŻ |
2857 | /* Note: do *NOT* check dst_metric_locked(dst, RTAX_MTU) |
2858 | * IPv6 pmtu discovery isn't optional, so 'mtu lock' cannot disable it. | |
2859 | * [see also comment in rt6_mtu_change_route()] | |
2860 | */ | |
19bda36c | 2861 | |
0dec879f JA |
2862 | if (iph) { |
2863 | daddr = &iph->daddr; | |
2864 | saddr = &iph->saddr; | |
2865 | } else if (sk) { | |
2866 | daddr = &sk->sk_v6_daddr; | |
2867 | saddr = &inet6_sk(sk)->saddr; | |
2868 | } else { | |
2869 | daddr = NULL; | |
2870 | saddr = NULL; | |
2871 | } | |
bd085ef6 HL |
2872 | |
2873 | if (confirm_neigh) | |
2874 | dst_confirm_neigh(dst, daddr); | |
2875 | ||
4a65dff8 GK |
2876 | if (mtu < IPV6_MIN_MTU) |
2877 | return; | |
45e4fd26 MKL |
2878 | if (mtu >= dst_mtu(dst)) |
2879 | return; | |
9d289715 | 2880 | |
0d3f6d29 | 2881 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 | 2882 | rt6_do_update_pmtu(rt6, mtu); |
2b760fcf WW |
2883 | /* update rt6_ex->stamp for cache */ |
2884 | if (rt6->rt6i_flags & RTF_CACHE) | |
2885 | rt6_update_exception_stamp_rt(rt6); | |
0dec879f | 2886 | } else if (daddr) { |
85bd05de | 2887 | struct fib6_result res = {}; |
45e4fd26 MKL |
2888 | struct rt6_info *nrt6; |
2889 | ||
4d85cd0c | 2890 | rcu_read_lock(); |
85bd05de | 2891 | res.f6i = rcu_dereference(rt6->from); |
43a4b60d DA |
2892 | if (!res.f6i) |
2893 | goto out_unlock; | |
2894 | ||
7d21fec9 DA |
2895 | res.fib6_flags = res.f6i->fib6_flags; |
2896 | res.fib6_type = res.f6i->fib6_type; | |
2897 | ||
2d44234b DA |
2898 | if (res.f6i->nh) { |
2899 | struct fib6_nh_match_arg arg = { | |
2900 | .dev = dst->dev, | |
2901 | .gw = &rt6->rt6i_gateway, | |
2902 | }; | |
2903 | ||
2904 | nexthop_for_each_fib6_nh(res.f6i->nh, | |
2905 | fib6_nh_find_match, &arg); | |
2906 | ||
2907 | /* fib6_info uses a nexthop that does not have fib6_nh | |
2908 | * using the dst->dev + gw. Should be impossible. | |
2909 | */ | |
43a4b60d DA |
2910 | if (!arg.match) |
2911 | goto out_unlock; | |
2d44234b DA |
2912 | |
2913 | res.nh = arg.match; | |
2914 | } else { | |
2915 | res.nh = res.f6i->fib6_nh; | |
2916 | } | |
2917 | ||
85bd05de | 2918 | nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr); |
45e4fd26 MKL |
2919 | if (nrt6) { |
2920 | rt6_do_update_pmtu(nrt6, mtu); | |
5012f0a5 | 2921 | if (rt6_insert_exception(nrt6, &res)) |
2b760fcf | 2922 | dst_release_immediate(&nrt6->dst); |
45e4fd26 | 2923 | } |
43a4b60d | 2924 | out_unlock: |
a68886a6 | 2925 | rcu_read_unlock(); |
1da177e4 LT |
2926 | } |
2927 | } | |
2928 | ||
45e4fd26 | 2929 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
2930 | struct sk_buff *skb, u32 mtu, |
2931 | bool confirm_neigh) | |
45e4fd26 | 2932 | { |
bd085ef6 HL |
2933 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu, |
2934 | confirm_neigh); | |
45e4fd26 MKL |
2935 | } |
2936 | ||
42ae66c8 | 2937 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
e2d118a1 | 2938 | int oif, u32 mark, kuid_t uid) |
81aded24 DM |
2939 | { |
2940 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2941 | struct dst_entry *dst; | |
dc92095d MŻ |
2942 | struct flowi6 fl6 = { |
2943 | .flowi6_oif = oif, | |
2944 | .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark), | |
2945 | .daddr = iph->daddr, | |
2946 | .saddr = iph->saddr, | |
2947 | .flowlabel = ip6_flowinfo(iph), | |
2948 | .flowi6_uid = uid, | |
2949 | }; | |
81aded24 DM |
2950 | |
2951 | dst = ip6_route_output(net, NULL, &fl6); | |
2952 | if (!dst->error) | |
bd085ef6 | 2953 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu), true); |
81aded24 DM |
2954 | dst_release(dst); |
2955 | } | |
2956 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
2957 | ||
2958 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
2959 | { | |
7ddacfa5 | 2960 | int oif = sk->sk_bound_dev_if; |
33c162a9 MKL |
2961 | struct dst_entry *dst; |
2962 | ||
7ddacfa5 DA |
2963 | if (!oif && skb->dev) |
2964 | oif = l3mdev_master_ifindex(skb->dev); | |
2965 | ||
3c5b4d69 ED |
2966 | ip6_update_pmtu(skb, sock_net(sk), mtu, oif, READ_ONCE(sk->sk_mark), |
2967 | sk->sk_uid); | |
33c162a9 MKL |
2968 | |
2969 | dst = __sk_dst_get(sk); | |
2970 | if (!dst || !dst->obsolete || | |
2971 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) | |
2972 | return; | |
2973 | ||
2974 | bh_lock_sock(sk); | |
2975 | if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
2976 | ip6_datagram_dst_update(sk, false); | |
2977 | bh_unlock_sock(sk); | |
81aded24 DM |
2978 | } |
2979 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
2980 | ||
7d6850f7 AK |
2981 | void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst, |
2982 | const struct flowi6 *fl6) | |
2983 | { | |
2984 | #ifdef CONFIG_IPV6_SUBTREES | |
2985 | struct ipv6_pinfo *np = inet6_sk(sk); | |
2986 | #endif | |
2987 | ||
2988 | ip6_dst_store(sk, dst, | |
2989 | ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ? | |
2990 | &sk->sk_v6_daddr : NULL, | |
2991 | #ifdef CONFIG_IPV6_SUBTREES | |
2992 | ipv6_addr_equal(&fl6->saddr, &np->saddr) ? | |
2993 | &np->saddr : | |
2994 | #endif | |
2995 | NULL); | |
2996 | } | |
2997 | ||
9b6b35ab | 2998 | static bool ip6_redirect_nh_match(const struct fib6_result *res, |
0b34eb00 DA |
2999 | struct flowi6 *fl6, |
3000 | const struct in6_addr *gw, | |
3001 | struct rt6_info **ret) | |
3002 | { | |
9b6b35ab DA |
3003 | const struct fib6_nh *nh = res->nh; |
3004 | ||
0b34eb00 DA |
3005 | if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family || |
3006 | fl6->flowi6_oif != nh->fib_nh_dev->ifindex) | |
3007 | return false; | |
3008 | ||
3009 | /* rt_cache's gateway might be different from its 'parent' | |
3010 | * in the case of an ip redirect. | |
3011 | * So we keep searching in the exception table if the gateway | |
3012 | * is different. | |
3013 | */ | |
3014 | if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) { | |
3015 | struct rt6_info *rt_cache; | |
3016 | ||
9b6b35ab | 3017 | rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr); |
0b34eb00 DA |
3018 | if (rt_cache && |
3019 | ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) { | |
3020 | *ret = rt_cache; | |
3021 | return true; | |
3022 | } | |
3023 | return false; | |
3024 | } | |
3025 | return true; | |
3026 | } | |
3027 | ||
c55c8988 DA |
3028 | struct fib6_nh_rd_arg { |
3029 | struct fib6_result *res; | |
3030 | struct flowi6 *fl6; | |
3031 | const struct in6_addr *gw; | |
3032 | struct rt6_info **ret; | |
3033 | }; | |
3034 | ||
3035 | static int fib6_nh_redirect_match(struct fib6_nh *nh, void *_arg) | |
3036 | { | |
3037 | struct fib6_nh_rd_arg *arg = _arg; | |
3038 | ||
3039 | arg->res->nh = nh; | |
3040 | return ip6_redirect_nh_match(arg->res, arg->fl6, arg->gw, arg->ret); | |
3041 | } | |
3042 | ||
b55b76b2 DJ |
3043 | /* Handle redirects */ |
3044 | struct ip6rd_flowi { | |
3045 | struct flowi6 fl6; | |
3046 | struct in6_addr gateway; | |
3047 | }; | |
3048 | ||
55cced4f | 3049 | INDIRECT_CALLABLE_SCOPE struct rt6_info *__ip6_route_redirect(struct net *net, |
b55b76b2 DJ |
3050 | struct fib6_table *table, |
3051 | struct flowi6 *fl6, | |
b75cc8f9 | 3052 | const struct sk_buff *skb, |
b55b76b2 DJ |
3053 | int flags) |
3054 | { | |
3055 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
0b34eb00 | 3056 | struct rt6_info *ret = NULL; |
9b6b35ab | 3057 | struct fib6_result res = {}; |
c55c8988 DA |
3058 | struct fib6_nh_rd_arg arg = { |
3059 | .res = &res, | |
3060 | .fl6 = fl6, | |
3061 | .gw = &rdfl->gateway, | |
3062 | .ret = &ret | |
3063 | }; | |
8d1c802b | 3064 | struct fib6_info *rt; |
b55b76b2 DJ |
3065 | struct fib6_node *fn; |
3066 | ||
3067 | /* Get the "current" route for this destination and | |
67c408cf | 3068 | * check if the redirect has come from appropriate router. |
b55b76b2 DJ |
3069 | * |
3070 | * RFC 4861 specifies that redirects should only be | |
3071 | * accepted if they come from the nexthop to the target. | |
3072 | * Due to the way the routes are chosen, this notion | |
3073 | * is a bit fuzzy and one might need to check all possible | |
3074 | * routes. | |
3075 | */ | |
3076 | ||
66f5d6ce | 3077 | rcu_read_lock(); |
6454743b | 3078 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
b55b76b2 | 3079 | restart: |
66f5d6ce | 3080 | for_each_fib6_node_rt_rcu(fn) { |
9b6b35ab | 3081 | res.f6i = rt; |
14895687 | 3082 | if (fib6_check_expired(rt)) |
b55b76b2 | 3083 | continue; |
93c2fb25 | 3084 | if (rt->fib6_flags & RTF_REJECT) |
b55b76b2 | 3085 | break; |
c55c8988 DA |
3086 | if (unlikely(rt->nh)) { |
3087 | if (nexthop_is_blackhole(rt->nh)) | |
3088 | continue; | |
3089 | /* on match, res->nh is filled in and potentially ret */ | |
3090 | if (nexthop_for_each_fib6_nh(rt->nh, | |
3091 | fib6_nh_redirect_match, | |
3092 | &arg)) | |
3093 | goto out; | |
3094 | } else { | |
3095 | res.nh = rt->fib6_nh; | |
3096 | if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway, | |
3097 | &ret)) | |
3098 | goto out; | |
3099 | } | |
b55b76b2 DJ |
3100 | } |
3101 | ||
3102 | if (!rt) | |
421842ed | 3103 | rt = net->ipv6.fib6_null_entry; |
93c2fb25 | 3104 | else if (rt->fib6_flags & RTF_REJECT) { |
23fb93a4 | 3105 | ret = net->ipv6.ip6_null_entry; |
b0a1ba59 MKL |
3106 | goto out; |
3107 | } | |
3108 | ||
421842ed | 3109 | if (rt == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
3110 | fn = fib6_backtrack(fn, &fl6->saddr); |
3111 | if (fn) | |
3112 | goto restart; | |
b55b76b2 | 3113 | } |
a3c00e46 | 3114 | |
9b6b35ab | 3115 | res.f6i = rt; |
1cf844c7 | 3116 | res.nh = rt->fib6_nh; |
b0a1ba59 | 3117 | out: |
7d21fec9 | 3118 | if (ret) { |
10585b43 | 3119 | ip6_hold_safe(net, &ret); |
7d21fec9 DA |
3120 | } else { |
3121 | res.fib6_flags = res.f6i->fib6_flags; | |
3122 | res.fib6_type = res.f6i->fib6_type; | |
9b6b35ab | 3123 | ret = ip6_create_rt_rcu(&res); |
7d21fec9 | 3124 | } |
b55b76b2 | 3125 | |
66f5d6ce | 3126 | rcu_read_unlock(); |
b55b76b2 | 3127 | |
8ff2e5b2 | 3128 | trace_fib6_table_lookup(net, &res, table, fl6); |
23fb93a4 | 3129 | return ret; |
b55b76b2 DJ |
3130 | }; |
3131 | ||
3132 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
b75cc8f9 DA |
3133 | const struct flowi6 *fl6, |
3134 | const struct sk_buff *skb, | |
3135 | const struct in6_addr *gateway) | |
b55b76b2 DJ |
3136 | { |
3137 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
3138 | struct ip6rd_flowi rdfl; | |
3139 | ||
3140 | rdfl.fl6 = *fl6; | |
3141 | rdfl.gateway = *gateway; | |
3142 | ||
b75cc8f9 | 3143 | return fib6_rule_lookup(net, &rdfl.fl6, skb, |
b55b76b2 DJ |
3144 | flags, __ip6_route_redirect); |
3145 | } | |
3146 | ||
e2d118a1 LC |
3147 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
3148 | kuid_t uid) | |
3a5ad2ee DM |
3149 | { |
3150 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
3151 | struct dst_entry *dst; | |
1f7f10ac MŻ |
3152 | struct flowi6 fl6 = { |
3153 | .flowi6_iif = LOOPBACK_IFINDEX, | |
3154 | .flowi6_oif = oif, | |
3155 | .flowi6_mark = mark, | |
3156 | .daddr = iph->daddr, | |
3157 | .saddr = iph->saddr, | |
3158 | .flowlabel = ip6_flowinfo(iph), | |
3159 | .flowi6_uid = uid, | |
3160 | }; | |
3a5ad2ee | 3161 | |
b75cc8f9 | 3162 | dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr); |
b55b76b2 | 3163 | rt6_do_redirect(dst, NULL, skb); |
3a5ad2ee DM |
3164 | dst_release(dst); |
3165 | } | |
3166 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
3167 | ||
d456336d | 3168 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif) |
c92a59ec DJ |
3169 | { |
3170 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
3171 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
3172 | struct dst_entry *dst; | |
0b26fb17 MŻ |
3173 | struct flowi6 fl6 = { |
3174 | .flowi6_iif = LOOPBACK_IFINDEX, | |
3175 | .flowi6_oif = oif, | |
0b26fb17 MŻ |
3176 | .daddr = msg->dest, |
3177 | .saddr = iph->daddr, | |
3178 | .flowi6_uid = sock_net_uid(net, NULL), | |
3179 | }; | |
c92a59ec | 3180 | |
b75cc8f9 | 3181 | dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr); |
b55b76b2 | 3182 | rt6_do_redirect(dst, NULL, skb); |
c92a59ec DJ |
3183 | dst_release(dst); |
3184 | } | |
3185 | ||
3a5ad2ee DM |
3186 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
3187 | { | |
3c5b4d69 ED |
3188 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, |
3189 | READ_ONCE(sk->sk_mark), sk->sk_uid); | |
3a5ad2ee DM |
3190 | } |
3191 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
3192 | ||
0dbaee3b | 3193 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 3194 | { |
0dbaee3b DM |
3195 | struct net_device *dev = dst->dev; |
3196 | unsigned int mtu = dst_mtu(dst); | |
3197 | struct net *net = dev_net(dev); | |
3198 | ||
1da177e4 LT |
3199 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
3200 | ||
5578689a DL |
3201 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
3202 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
3203 | |
3204 | /* | |
1ab1457c YH |
3205 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
3206 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
3207 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
3208 | * rely only on pmtu discovery" |
3209 | */ | |
3210 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
3211 | mtu = IPV6_MAXPLEN; | |
3212 | return mtu; | |
3213 | } | |
3214 | ||
f67fbeae | 3215 | INDIRECT_CALLABLE_SCOPE unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 3216 | { |
427faee1 | 3217 | return ip6_dst_mtu_maybe_forward(dst, false); |
d33e4553 | 3218 | } |
9c97921a | 3219 | EXPORT_INDIRECT_CALLABLE(ip6_mtu); |
d33e4553 | 3220 | |
901731b8 DA |
3221 | /* MTU selection: |
3222 | * 1. mtu on route is locked - use it | |
3223 | * 2. mtu from nexthop exception | |
3224 | * 3. mtu from egress device | |
3225 | * | |
3226 | * based on ip6_dst_mtu_forward and exception logic of | |
3227 | * rt6_find_cached_rt; called with rcu_read_lock | |
3228 | */ | |
b748f260 DA |
3229 | u32 ip6_mtu_from_fib6(const struct fib6_result *res, |
3230 | const struct in6_addr *daddr, | |
3231 | const struct in6_addr *saddr) | |
901731b8 | 3232 | { |
b748f260 DA |
3233 | const struct fib6_nh *nh = res->nh; |
3234 | struct fib6_info *f6i = res->f6i; | |
901731b8 | 3235 | struct inet6_dev *idev; |
510e2ced | 3236 | struct rt6_info *rt; |
901731b8 DA |
3237 | u32 mtu = 0; |
3238 | ||
3239 | if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) { | |
3240 | mtu = f6i->fib6_pmtu; | |
3241 | if (mtu) | |
3242 | goto out; | |
3243 | } | |
3244 | ||
510e2ced WW |
3245 | rt = rt6_find_cached_rt(res, daddr, saddr); |
3246 | if (unlikely(rt)) { | |
3247 | mtu = dst_metric_raw(&rt->dst, RTAX_MTU); | |
3248 | } else { | |
b748f260 | 3249 | struct net_device *dev = nh->fib_nh_dev; |
901731b8 DA |
3250 | |
3251 | mtu = IPV6_MIN_MTU; | |
3252 | idev = __in6_dev_get(dev); | |
e7135f48 ED |
3253 | if (idev) |
3254 | mtu = max_t(u32, mtu, READ_ONCE(idev->cnf.mtu6)); | |
901731b8 DA |
3255 | } |
3256 | ||
3257 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); | |
3258 | out: | |
b748f260 | 3259 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
901731b8 DA |
3260 | } |
3261 | ||
3b00944c | 3262 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 3263 | struct flowi6 *fl6) |
1da177e4 | 3264 | { |
87a11578 | 3265 | struct dst_entry *dst; |
1da177e4 LT |
3266 | struct rt6_info *rt; |
3267 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 3268 | struct net *net = dev_net(dev); |
1da177e4 | 3269 | |
38308473 | 3270 | if (unlikely(!idev)) |
122bdf67 | 3271 | return ERR_PTR(-ENODEV); |
1da177e4 | 3272 | |
ad706862 | 3273 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 3274 | if (unlikely(!rt)) { |
1da177e4 | 3275 | in6_dev_put(idev); |
87a11578 | 3276 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
3277 | goto out; |
3278 | } | |
3279 | ||
588753f1 | 3280 | rt->dst.input = ip6_input; |
8e2ec639 | 3281 | rt->dst.output = ip6_output; |
550bab42 | 3282 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 3283 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
3284 | rt->rt6i_dst.plen = 128; |
3285 | rt->rt6i_idev = idev; | |
14edd87d | 3286 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 3287 | |
4c981e28 | 3288 | /* Add this dst into uncached_list so that rt6_disable_ip() can |
587fea74 WW |
3289 | * do proper release of the net_device |
3290 | */ | |
3291 | rt6_uncached_list_add(rt); | |
1da177e4 | 3292 | |
87a11578 DM |
3293 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
3294 | ||
1da177e4 | 3295 | out: |
87a11578 | 3296 | return dst; |
1da177e4 LT |
3297 | } |
3298 | ||
af6d1034 | 3299 | static void ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 3300 | { |
86393e52 | 3301 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e | 3302 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
7019b78e DL |
3303 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; |
3304 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3305 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
9cb7c013 | 3306 | unsigned int val; |
fc66f95c | 3307 | int entries; |
7019b78e | 3308 | |
af6d1034 | 3309 | if (time_after(rt_last_gc + rt_min_interval, jiffies)) |
1da177e4 LT |
3310 | goto out; |
3311 | ||
9cb7c013 | 3312 | fib6_run_gc(atomic_inc_return(&net->ipv6.ip6_rt_gc_expire), net, true); |
fc66f95c ED |
3313 | entries = dst_entries_get_slow(ops); |
3314 | if (entries < ops->gc_thresh) | |
9cb7c013 | 3315 | atomic_set(&net->ipv6.ip6_rt_gc_expire, rt_gc_timeout >> 1); |
1da177e4 | 3316 | out: |
9cb7c013 ED |
3317 | val = atomic_read(&net->ipv6.ip6_rt_gc_expire); |
3318 | atomic_set(&net->ipv6.ip6_rt_gc_expire, val - (val >> rt_elasticity)); | |
1da177e4 LT |
3319 | } |
3320 | ||
b2c709cc DA |
3321 | static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg, |
3322 | const struct in6_addr *gw_addr, u32 tbid, | |
3323 | int flags, struct fib6_result *res) | |
8c14586f DA |
3324 | { |
3325 | struct flowi6 fl6 = { | |
3326 | .flowi6_oif = cfg->fc_ifindex, | |
3327 | .daddr = *gw_addr, | |
3328 | .saddr = cfg->fc_prefsrc, | |
3329 | }; | |
3330 | struct fib6_table *table; | |
b2c709cc | 3331 | int err; |
8c14586f | 3332 | |
f4797b33 | 3333 | table = fib6_get_table(net, tbid); |
8c14586f | 3334 | if (!table) |
b2c709cc | 3335 | return -EINVAL; |
8c14586f DA |
3336 | |
3337 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) | |
3338 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3339 | ||
f4797b33 | 3340 | flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE; |
8c14586f | 3341 | |
b2c709cc DA |
3342 | err = fib6_table_lookup(net, table, cfg->fc_ifindex, &fl6, res, flags); |
3343 | if (!err && res->f6i != net->ipv6.fib6_null_entry) | |
3344 | fib6_select_path(net, res, &fl6, cfg->fc_ifindex, | |
3345 | cfg->fc_ifindex != 0, NULL, flags); | |
8c14586f | 3346 | |
b2c709cc | 3347 | return err; |
8c14586f DA |
3348 | } |
3349 | ||
fc1e64e1 DA |
3350 | static int ip6_route_check_nh_onlink(struct net *net, |
3351 | struct fib6_config *cfg, | |
9fbb704c | 3352 | const struct net_device *dev, |
fc1e64e1 DA |
3353 | struct netlink_ext_ack *extack) |
3354 | { | |
b2c709cc | 3355 | u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; |
fc1e64e1 | 3356 | const struct in6_addr *gw_addr = &cfg->fc_gateway; |
b2c709cc | 3357 | struct fib6_result res = {}; |
fc1e64e1 DA |
3358 | int err; |
3359 | ||
b2c709cc DA |
3360 | err = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0, &res); |
3361 | if (!err && !(res.fib6_flags & RTF_REJECT) && | |
3362 | /* ignore match if it is the default route */ | |
3363 | !ipv6_addr_any(&res.f6i->fib6_dst.addr) && | |
3364 | (res.fib6_type != RTN_UNICAST || dev != res.nh->fib_nh_dev)) { | |
3365 | NL_SET_ERR_MSG(extack, | |
3366 | "Nexthop has invalid gateway or device mismatch"); | |
3367 | err = -EINVAL; | |
fc1e64e1 DA |
3368 | } |
3369 | ||
3370 | return err; | |
3371 | } | |
3372 | ||
1edce99f DA |
3373 | static int ip6_route_check_nh(struct net *net, |
3374 | struct fib6_config *cfg, | |
3375 | struct net_device **_dev, | |
3515440d | 3376 | netdevice_tracker *dev_tracker, |
1edce99f DA |
3377 | struct inet6_dev **idev) |
3378 | { | |
3379 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
3380 | struct net_device *dev = _dev ? *_dev : NULL; | |
b2c709cc DA |
3381 | int flags = RT6_LOOKUP_F_IFACE; |
3382 | struct fib6_result res = {}; | |
1edce99f DA |
3383 | int err = -EHOSTUNREACH; |
3384 | ||
3385 | if (cfg->fc_table) { | |
b2c709cc DA |
3386 | err = ip6_nh_lookup_table(net, cfg, gw_addr, |
3387 | cfg->fc_table, flags, &res); | |
3388 | /* gw_addr can not require a gateway or resolve to a reject | |
3389 | * route. If a device is given, it must match the result. | |
3390 | */ | |
3391 | if (err || res.fib6_flags & RTF_REJECT || | |
3392 | res.nh->fib_nh_gw_family || | |
3393 | (dev && dev != res.nh->fib_nh_dev)) | |
3394 | err = -EHOSTUNREACH; | |
1edce99f DA |
3395 | } |
3396 | ||
b2c709cc DA |
3397 | if (err < 0) { |
3398 | struct flowi6 fl6 = { | |
3399 | .flowi6_oif = cfg->fc_ifindex, | |
3400 | .daddr = *gw_addr, | |
3401 | }; | |
1edce99f | 3402 | |
b2c709cc DA |
3403 | err = fib6_lookup(net, cfg->fc_ifindex, &fl6, &res, flags); |
3404 | if (err || res.fib6_flags & RTF_REJECT || | |
3405 | res.nh->fib_nh_gw_family) | |
3406 | err = -EHOSTUNREACH; | |
3407 | ||
3408 | if (err) | |
3409 | return err; | |
3410 | ||
3411 | fib6_select_path(net, &res, &fl6, cfg->fc_ifindex, | |
3412 | cfg->fc_ifindex != 0, NULL, flags); | |
3413 | } | |
1edce99f | 3414 | |
b2c709cc | 3415 | err = 0; |
1edce99f | 3416 | if (dev) { |
b2c709cc DA |
3417 | if (dev != res.nh->fib_nh_dev) |
3418 | err = -EHOSTUNREACH; | |
1edce99f | 3419 | } else { |
b2c709cc | 3420 | *_dev = dev = res.nh->fib_nh_dev; |
3515440d | 3421 | netdev_hold(dev, dev_tracker, GFP_ATOMIC); |
b2c709cc | 3422 | *idev = in6_dev_get(dev); |
1edce99f DA |
3423 | } |
3424 | ||
1edce99f DA |
3425 | return err; |
3426 | } | |
3427 | ||
9fbb704c | 3428 | static int ip6_validate_gw(struct net *net, struct fib6_config *cfg, |
3515440d ED |
3429 | struct net_device **_dev, |
3430 | netdevice_tracker *dev_tracker, | |
3431 | struct inet6_dev **idev, | |
9fbb704c DA |
3432 | struct netlink_ext_ack *extack) |
3433 | { | |
3434 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
3435 | int gwa_type = ipv6_addr_type(gw_addr); | |
232378e8 | 3436 | bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true; |
9fbb704c | 3437 | const struct net_device *dev = *_dev; |
232378e8 | 3438 | bool need_addr_check = !dev; |
9fbb704c DA |
3439 | int err = -EINVAL; |
3440 | ||
3441 | /* if gw_addr is local we will fail to detect this in case | |
3442 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
3443 | * will return already-added prefix route via interface that | |
3444 | * prefix route was assigned to, which might be non-loopback. | |
3445 | */ | |
232378e8 DA |
3446 | if (dev && |
3447 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3448 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
9fbb704c DA |
3449 | goto out; |
3450 | } | |
3451 | ||
3452 | if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) { | |
3453 | /* IPv6 strictly inhibits using not link-local | |
3454 | * addresses as nexthop address. | |
3455 | * Otherwise, router will not able to send redirects. | |
3456 | * It is very good, but in some (rare!) circumstances | |
3457 | * (SIT, PtP, NBMA NOARP links) it is handy to allow | |
3458 | * some exceptions. --ANK | |
3459 | * We allow IPv4-mapped nexthops to support RFC4798-type | |
3460 | * addressing | |
3461 | */ | |
3462 | if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) { | |
3463 | NL_SET_ERR_MSG(extack, "Invalid gateway address"); | |
3464 | goto out; | |
3465 | } | |
3466 | ||
b2c709cc DA |
3467 | rcu_read_lock(); |
3468 | ||
9fbb704c DA |
3469 | if (cfg->fc_flags & RTNH_F_ONLINK) |
3470 | err = ip6_route_check_nh_onlink(net, cfg, dev, extack); | |
3471 | else | |
3515440d ED |
3472 | err = ip6_route_check_nh(net, cfg, _dev, dev_tracker, |
3473 | idev); | |
9fbb704c | 3474 | |
b2c709cc DA |
3475 | rcu_read_unlock(); |
3476 | ||
9fbb704c DA |
3477 | if (err) |
3478 | goto out; | |
3479 | } | |
3480 | ||
3481 | /* reload in case device was changed */ | |
3482 | dev = *_dev; | |
3483 | ||
3484 | err = -EINVAL; | |
3485 | if (!dev) { | |
3486 | NL_SET_ERR_MSG(extack, "Egress device not specified"); | |
3487 | goto out; | |
3488 | } else if (dev->flags & IFF_LOOPBACK) { | |
3489 | NL_SET_ERR_MSG(extack, | |
3490 | "Egress device can not be loopback device for this route"); | |
3491 | goto out; | |
3492 | } | |
232378e8 DA |
3493 | |
3494 | /* if we did not check gw_addr above, do so now that the | |
3495 | * egress device has been resolved. | |
3496 | */ | |
3497 | if (need_addr_check && | |
3498 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3499 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
3500 | goto out; | |
3501 | } | |
3502 | ||
9fbb704c DA |
3503 | err = 0; |
3504 | out: | |
3505 | return err; | |
3506 | } | |
3507 | ||
83c44251 DA |
3508 | static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type) |
3509 | { | |
3510 | if ((flags & RTF_REJECT) || | |
3511 | (dev && (dev->flags & IFF_LOOPBACK) && | |
3512 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
aea23c32 | 3513 | !(flags & (RTF_ANYCAST | RTF_LOCAL)))) |
83c44251 DA |
3514 | return true; |
3515 | ||
3516 | return false; | |
3517 | } | |
3518 | ||
3519 | int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh, | |
3520 | struct fib6_config *cfg, gfp_t gfp_flags, | |
3521 | struct netlink_ext_ack *extack) | |
3522 | { | |
70f7457a | 3523 | netdevice_tracker *dev_tracker = &fib6_nh->fib_nh_dev_tracker; |
83c44251 DA |
3524 | struct net_device *dev = NULL; |
3525 | struct inet6_dev *idev = NULL; | |
3526 | int addr_type; | |
3527 | int err; | |
3528 | ||
f1741730 | 3529 | fib6_nh->fib_nh_family = AF_INET6; |
1bef4c22 ED |
3530 | #ifdef CONFIG_IPV6_ROUTER_PREF |
3531 | fib6_nh->last_probe = jiffies; | |
3532 | #endif | |
38428d68 RP |
3533 | if (cfg->fc_is_fdb) { |
3534 | fib6_nh->fib_nh_gw6 = cfg->fc_gateway; | |
3535 | fib6_nh->fib_nh_gw_family = AF_INET6; | |
3536 | return 0; | |
3537 | } | |
f1741730 | 3538 | |
83c44251 DA |
3539 | err = -ENODEV; |
3540 | if (cfg->fc_ifindex) { | |
70f7457a JK |
3541 | dev = netdev_get_by_index(net, cfg->fc_ifindex, |
3542 | dev_tracker, gfp_flags); | |
83c44251 DA |
3543 | if (!dev) |
3544 | goto out; | |
3545 | idev = in6_dev_get(dev); | |
3546 | if (!idev) | |
3547 | goto out; | |
3548 | } | |
3549 | ||
3550 | if (cfg->fc_flags & RTNH_F_ONLINK) { | |
3551 | if (!dev) { | |
3552 | NL_SET_ERR_MSG(extack, | |
3553 | "Nexthop device required for onlink"); | |
3554 | goto out; | |
3555 | } | |
3556 | ||
3557 | if (!(dev->flags & IFF_UP)) { | |
3558 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3559 | err = -ENETDOWN; | |
3560 | goto out; | |
3561 | } | |
3562 | ||
ad1601ae | 3563 | fib6_nh->fib_nh_flags |= RTNH_F_ONLINK; |
83c44251 DA |
3564 | } |
3565 | ||
ad1601ae | 3566 | fib6_nh->fib_nh_weight = 1; |
83c44251 DA |
3567 | |
3568 | /* We cannot add true routes via loopback here, | |
3569 | * they would result in kernel looping; promote them to reject routes | |
3570 | */ | |
3571 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3572 | if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) { | |
3573 | /* hold loopback dev/idev if we haven't done so. */ | |
3574 | if (dev != net->loopback_dev) { | |
3575 | if (dev) { | |
70f7457a | 3576 | netdev_put(dev, dev_tracker); |
83c44251 DA |
3577 | in6_dev_put(idev); |
3578 | } | |
3579 | dev = net->loopback_dev; | |
70f7457a | 3580 | netdev_hold(dev, dev_tracker, gfp_flags); |
83c44251 DA |
3581 | idev = in6_dev_get(dev); |
3582 | if (!idev) { | |
3583 | err = -ENODEV; | |
3584 | goto out; | |
3585 | } | |
3586 | } | |
7dd73168 | 3587 | goto pcpu_alloc; |
83c44251 DA |
3588 | } |
3589 | ||
3590 | if (cfg->fc_flags & RTF_GATEWAY) { | |
3515440d ED |
3591 | err = ip6_validate_gw(net, cfg, &dev, dev_tracker, |
3592 | &idev, extack); | |
83c44251 DA |
3593 | if (err) |
3594 | goto out; | |
3595 | ||
ad1601ae | 3596 | fib6_nh->fib_nh_gw6 = cfg->fc_gateway; |
bdf00467 | 3597 | fib6_nh->fib_nh_gw_family = AF_INET6; |
83c44251 DA |
3598 | } |
3599 | ||
3600 | err = -ENODEV; | |
3601 | if (!dev) | |
3602 | goto out; | |
3603 | ||
3604 | if (idev->cnf.disable_ipv6) { | |
3605 | NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device"); | |
3606 | err = -EACCES; | |
3607 | goto out; | |
3608 | } | |
3609 | ||
3610 | if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) { | |
3611 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3612 | err = -ENETDOWN; | |
3613 | goto out; | |
3614 | } | |
3615 | ||
3616 | if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) && | |
3617 | !netif_carrier_ok(dev)) | |
ad1601ae | 3618 | fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
83c44251 | 3619 | |
faee6769 | 3620 | err = fib_nh_common_init(net, &fib6_nh->nh_common, cfg->fc_encap, |
7dd73168 DA |
3621 | cfg->fc_encap_type, cfg, gfp_flags, extack); |
3622 | if (err) | |
3623 | goto out; | |
3624 | ||
3625 | pcpu_alloc: | |
f40b6ae2 DA |
3626 | fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags); |
3627 | if (!fib6_nh->rt6i_pcpu) { | |
3628 | err = -ENOMEM; | |
3629 | goto out; | |
3630 | } | |
3631 | ||
ad1601ae | 3632 | fib6_nh->fib_nh_dev = dev; |
f1741730 | 3633 | fib6_nh->fib_nh_oif = dev->ifindex; |
83c44251 DA |
3634 | err = 0; |
3635 | out: | |
3636 | if (idev) | |
3637 | in6_dev_put(idev); | |
3638 | ||
3639 | if (err) { | |
ad1601ae DA |
3640 | lwtstate_put(fib6_nh->fib_nh_lws); |
3641 | fib6_nh->fib_nh_lws = NULL; | |
70f7457a | 3642 | netdev_put(dev, dev_tracker); |
83c44251 DA |
3643 | } |
3644 | ||
3645 | return err; | |
3646 | } | |
3647 | ||
dac7d0f2 DA |
3648 | void fib6_nh_release(struct fib6_nh *fib6_nh) |
3649 | { | |
cc5c073a DA |
3650 | struct rt6_exception_bucket *bucket; |
3651 | ||
3652 | rcu_read_lock(); | |
3653 | ||
3654 | fib6_nh_flush_exceptions(fib6_nh, NULL); | |
3655 | bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL); | |
3656 | if (bucket) { | |
3657 | rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL); | |
3658 | kfree(bucket); | |
3659 | } | |
3660 | ||
3661 | rcu_read_unlock(); | |
3662 | ||
61308050 NA |
3663 | fib6_nh_release_dsts(fib6_nh); |
3664 | free_percpu(fib6_nh->rt6i_pcpu); | |
f40b6ae2 | 3665 | |
979e276e | 3666 | fib_nh_common_release(&fib6_nh->nh_common); |
dac7d0f2 DA |
3667 | } |
3668 | ||
8837cbbf NA |
3669 | void fib6_nh_release_dsts(struct fib6_nh *fib6_nh) |
3670 | { | |
3671 | int cpu; | |
3672 | ||
3673 | if (!fib6_nh->rt6i_pcpu) | |
3674 | return; | |
3675 | ||
3676 | for_each_possible_cpu(cpu) { | |
3677 | struct rt6_info *pcpu_rt, **ppcpu_rt; | |
3678 | ||
3679 | ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu); | |
3680 | pcpu_rt = xchg(ppcpu_rt, NULL); | |
3681 | if (pcpu_rt) { | |
3682 | dst_dev_put(&pcpu_rt->dst); | |
3683 | dst_release(&pcpu_rt->dst); | |
3684 | } | |
3685 | } | |
3686 | } | |
3687 | ||
8d1c802b | 3688 | static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg, |
acb54e3c | 3689 | gfp_t gfp_flags, |
333c4301 | 3690 | struct netlink_ext_ack *extack) |
1da177e4 | 3691 | { |
5578689a | 3692 | struct net *net = cfg->fc_nlinfo.nl_net; |
8d1c802b | 3693 | struct fib6_info *rt = NULL; |
f88d8ea6 | 3694 | struct nexthop *nh = NULL; |
c71099ac | 3695 | struct fib6_table *table; |
f88d8ea6 | 3696 | struct fib6_nh *fib6_nh; |
8c5b83f0 | 3697 | int err = -EINVAL; |
83c44251 | 3698 | int addr_type; |
1da177e4 | 3699 | |
557c44be | 3700 | /* RTF_PCPU is an internal flag; can not be set by userspace */ |
d5d531cb DA |
3701 | if (cfg->fc_flags & RTF_PCPU) { |
3702 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU"); | |
557c44be | 3703 | goto out; |
d5d531cb | 3704 | } |
557c44be | 3705 | |
2ea2352e WW |
3706 | /* RTF_CACHE is an internal flag; can not be set by userspace */ |
3707 | if (cfg->fc_flags & RTF_CACHE) { | |
3708 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE"); | |
3709 | goto out; | |
3710 | } | |
3711 | ||
e8478e80 DA |
3712 | if (cfg->fc_type > RTN_MAX) { |
3713 | NL_SET_ERR_MSG(extack, "Invalid route type"); | |
3714 | goto out; | |
3715 | } | |
3716 | ||
d5d531cb DA |
3717 | if (cfg->fc_dst_len > 128) { |
3718 | NL_SET_ERR_MSG(extack, "Invalid prefix length"); | |
3719 | goto out; | |
3720 | } | |
3721 | if (cfg->fc_src_len > 128) { | |
3722 | NL_SET_ERR_MSG(extack, "Invalid source address length"); | |
8c5b83f0 | 3723 | goto out; |
d5d531cb | 3724 | } |
1da177e4 | 3725 | #ifndef CONFIG_IPV6_SUBTREES |
d5d531cb DA |
3726 | if (cfg->fc_src_len) { |
3727 | NL_SET_ERR_MSG(extack, | |
3728 | "Specifying source address requires IPV6_SUBTREES to be enabled"); | |
8c5b83f0 | 3729 | goto out; |
d5d531cb | 3730 | } |
1da177e4 | 3731 | #endif |
5b98324e DA |
3732 | if (cfg->fc_nh_id) { |
3733 | nh = nexthop_find_by_id(net, cfg->fc_nh_id); | |
3734 | if (!nh) { | |
3735 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
3736 | goto out; | |
3737 | } | |
3738 | err = fib6_check_nexthop(nh, cfg, extack); | |
3739 | if (err) | |
3740 | goto out; | |
3741 | } | |
fc1e64e1 | 3742 | |
d71314b4 | 3743 | err = -ENOBUFS; |
38308473 DM |
3744 | if (cfg->fc_nlinfo.nlh && |
3745 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 3746 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 3747 | if (!table) { |
f3213831 | 3748 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
3749 | table = fib6_new_table(net, cfg->fc_table); |
3750 | } | |
3751 | } else { | |
3752 | table = fib6_new_table(net, cfg->fc_table); | |
3753 | } | |
38308473 DM |
3754 | |
3755 | if (!table) | |
c71099ac | 3756 | goto out; |
c71099ac | 3757 | |
93531c67 | 3758 | err = -ENOMEM; |
f88d8ea6 | 3759 | rt = fib6_info_alloc(gfp_flags, !nh); |
93531c67 | 3760 | if (!rt) |
1da177e4 | 3761 | goto out; |
93531c67 | 3762 | |
d7e774f3 DA |
3763 | rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len, |
3764 | extack); | |
767a2217 DA |
3765 | if (IS_ERR(rt->fib6_metrics)) { |
3766 | err = PTR_ERR(rt->fib6_metrics); | |
fda21d46 ED |
3767 | /* Do not leave garbage there. */ |
3768 | rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics; | |
8fb4792f | 3769 | goto out_free; |
767a2217 DA |
3770 | } |
3771 | ||
93531c67 DA |
3772 | if (cfg->fc_flags & RTF_ADDRCONF) |
3773 | rt->dst_nocount = true; | |
1da177e4 | 3774 | |
1716a961 | 3775 | if (cfg->fc_flags & RTF_EXPIRES) |
dade3f6a DA |
3776 | fib6_set_expires(rt, jiffies + |
3777 | clock_t_to_jiffies(cfg->fc_expires)); | |
1da177e4 | 3778 | |
86872cb5 TG |
3779 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
3780 | cfg->fc_protocol = RTPROT_BOOT; | |
93c2fb25 | 3781 | rt->fib6_protocol = cfg->fc_protocol; |
86872cb5 | 3782 | |
83c44251 DA |
3783 | rt->fib6_table = table; |
3784 | rt->fib6_metric = cfg->fc_metric; | |
c7036d97 | 3785 | rt->fib6_type = cfg->fc_type ? : RTN_UNICAST; |
2b2450ca | 3786 | rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY; |
19e42e45 | 3787 | |
93c2fb25 DA |
3788 | ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
3789 | rt->fib6_dst.plen = cfg->fc_dst_len; | |
e5fd387a | 3790 | |
1da177e4 | 3791 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 DA |
3792 | ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len); |
3793 | rt->fib6_src.plen = cfg->fc_src_len; | |
1da177e4 | 3794 | #endif |
f88d8ea6 | 3795 | if (nh) { |
f88d8ea6 | 3796 | if (rt->fib6_src.plen) { |
4daa95af | 3797 | NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing"); |
821bbf79 | 3798 | goto out_free; |
f88d8ea6 | 3799 | } |
706ec919 XY |
3800 | if (!nexthop_get(nh)) { |
3801 | NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); | |
821bbf79 | 3802 | goto out_free; |
706ec919 | 3803 | } |
f88d8ea6 DA |
3804 | rt->nh = nh; |
3805 | fib6_nh = nexthop_fib6_nh(rt->nh); | |
3806 | } else { | |
3807 | err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack); | |
3808 | if (err) | |
3809 | goto out; | |
1da177e4 | 3810 | |
f88d8ea6 DA |
3811 | fib6_nh = rt->fib6_nh; |
3812 | ||
3813 | /* We cannot add true routes via loopback here, they would | |
3814 | * result in kernel looping; promote them to reject routes | |
3815 | */ | |
3816 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3817 | if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev, | |
3818 | addr_type)) | |
3819 | rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP; | |
3820 | } | |
955ec4cb | 3821 | |
c3968a85 | 3822 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
f88d8ea6 | 3823 | struct net_device *dev = fib6_nh->fib_nh_dev; |
83c44251 | 3824 | |
c3968a85 | 3825 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { |
d5d531cb | 3826 | NL_SET_ERR_MSG(extack, "Invalid source address"); |
c3968a85 DW |
3827 | err = -EINVAL; |
3828 | goto out; | |
3829 | } | |
93c2fb25 DA |
3830 | rt->fib6_prefsrc.addr = cfg->fc_prefsrc; |
3831 | rt->fib6_prefsrc.plen = 128; | |
c3968a85 | 3832 | } else |
93c2fb25 | 3833 | rt->fib6_prefsrc.plen = 0; |
c3968a85 | 3834 | |
8c5b83f0 | 3835 | return rt; |
6b9ea5a6 | 3836 | out: |
93531c67 | 3837 | fib6_info_release(rt); |
8c5b83f0 | 3838 | return ERR_PTR(err); |
821bbf79 CL |
3839 | out_free: |
3840 | ip_fib_metrics_put(rt->fib6_metrics); | |
3841 | kfree(rt); | |
3842 | return ERR_PTR(err); | |
6b9ea5a6 RP |
3843 | } |
3844 | ||
acb54e3c | 3845 | int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags, |
333c4301 | 3846 | struct netlink_ext_ack *extack) |
6b9ea5a6 | 3847 | { |
8d1c802b | 3848 | struct fib6_info *rt; |
6b9ea5a6 RP |
3849 | int err; |
3850 | ||
acb54e3c | 3851 | rt = ip6_route_info_create(cfg, gfp_flags, extack); |
d4ead6b3 DA |
3852 | if (IS_ERR(rt)) |
3853 | return PTR_ERR(rt); | |
6b9ea5a6 | 3854 | |
d4ead6b3 | 3855 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack); |
93531c67 | 3856 | fib6_info_release(rt); |
6b9ea5a6 | 3857 | |
1da177e4 LT |
3858 | return err; |
3859 | } | |
3860 | ||
8d1c802b | 3861 | static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info) |
1da177e4 | 3862 | { |
afb1d4b5 | 3863 | struct net *net = info->nl_net; |
c71099ac | 3864 | struct fib6_table *table; |
afb1d4b5 | 3865 | int err; |
1da177e4 | 3866 | |
421842ed | 3867 | if (rt == net->ipv6.fib6_null_entry) { |
6825a26c G |
3868 | err = -ENOENT; |
3869 | goto out; | |
3870 | } | |
6c813a72 | 3871 | |
93c2fb25 | 3872 | table = rt->fib6_table; |
66f5d6ce | 3873 | spin_lock_bh(&table->tb6_lock); |
86872cb5 | 3874 | err = fib6_del(rt, info); |
66f5d6ce | 3875 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 | 3876 | |
6825a26c | 3877 | out: |
93531c67 | 3878 | fib6_info_release(rt); |
1da177e4 LT |
3879 | return err; |
3880 | } | |
3881 | ||
11dd74b3 | 3882 | int ip6_del_rt(struct net *net, struct fib6_info *rt, bool skip_notify) |
e0a1ad73 | 3883 | { |
11dd74b3 RP |
3884 | struct nl_info info = { |
3885 | .nl_net = net, | |
3886 | .skip_notify = skip_notify | |
3887 | }; | |
afb1d4b5 | 3888 | |
528c4ceb | 3889 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
3890 | } |
3891 | ||
8d1c802b | 3892 | static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg) |
0ae81335 DA |
3893 | { |
3894 | struct nl_info *info = &cfg->fc_nlinfo; | |
e3330039 | 3895 | struct net *net = info->nl_net; |
16a16cd3 | 3896 | struct sk_buff *skb = NULL; |
0ae81335 | 3897 | struct fib6_table *table; |
e3330039 | 3898 | int err = -ENOENT; |
0ae81335 | 3899 | |
421842ed | 3900 | if (rt == net->ipv6.fib6_null_entry) |
e3330039 | 3901 | goto out_put; |
93c2fb25 | 3902 | table = rt->fib6_table; |
66f5d6ce | 3903 | spin_lock_bh(&table->tb6_lock); |
0ae81335 | 3904 | |
93c2fb25 | 3905 | if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) { |
8d1c802b | 3906 | struct fib6_info *sibling, *next_sibling; |
0284696b | 3907 | struct fib6_node *fn; |
0ae81335 | 3908 | |
16a16cd3 DA |
3909 | /* prefer to send a single notification with all hops */ |
3910 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
3911 | if (skb) { | |
3912 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
3913 | ||
d4ead6b3 | 3914 | if (rt6_fill_node(net, skb, rt, NULL, |
16a16cd3 DA |
3915 | NULL, NULL, 0, RTM_DELROUTE, |
3916 | info->portid, seq, 0) < 0) { | |
3917 | kfree_skb(skb); | |
3918 | skb = NULL; | |
3919 | } else | |
3920 | info->skip_notify = 1; | |
3921 | } | |
3922 | ||
0284696b IS |
3923 | /* 'rt' points to the first sibling route. If it is not the |
3924 | * leaf, then we do not need to send a notification. Otherwise, | |
3925 | * we need to check if the last sibling has a next route or not | |
3926 | * and emit a replace or delete notification, respectively. | |
3927 | */ | |
2881fd61 | 3928 | info->skip_notify_kernel = 1; |
0284696b IS |
3929 | fn = rcu_dereference_protected(rt->fib6_node, |
3930 | lockdep_is_held(&table->tb6_lock)); | |
3931 | if (rcu_access_pointer(fn->leaf) == rt) { | |
3932 | struct fib6_info *last_sibling, *replace_rt; | |
3933 | ||
3934 | last_sibling = list_last_entry(&rt->fib6_siblings, | |
3935 | struct fib6_info, | |
3936 | fib6_siblings); | |
3937 | replace_rt = rcu_dereference_protected( | |
3938 | last_sibling->fib6_next, | |
3939 | lockdep_is_held(&table->tb6_lock)); | |
3940 | if (replace_rt) | |
3941 | call_fib6_entry_notifiers_replace(net, | |
3942 | replace_rt); | |
3943 | else | |
3944 | call_fib6_multipath_entry_notifiers(net, | |
caafb250 | 3945 | FIB_EVENT_ENTRY_DEL, |
0284696b IS |
3946 | rt, rt->fib6_nsiblings, |
3947 | NULL); | |
3948 | } | |
0ae81335 | 3949 | list_for_each_entry_safe(sibling, next_sibling, |
93c2fb25 DA |
3950 | &rt->fib6_siblings, |
3951 | fib6_siblings) { | |
0ae81335 DA |
3952 | err = fib6_del(sibling, info); |
3953 | if (err) | |
e3330039 | 3954 | goto out_unlock; |
0ae81335 DA |
3955 | } |
3956 | } | |
3957 | ||
3958 | err = fib6_del(rt, info); | |
e3330039 | 3959 | out_unlock: |
66f5d6ce | 3960 | spin_unlock_bh(&table->tb6_lock); |
e3330039 | 3961 | out_put: |
93531c67 | 3962 | fib6_info_release(rt); |
16a16cd3 DA |
3963 | |
3964 | if (skb) { | |
e3330039 | 3965 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
16a16cd3 DA |
3966 | info->nlh, gfp_any()); |
3967 | } | |
0ae81335 DA |
3968 | return err; |
3969 | } | |
3970 | ||
0fa6efc5 | 3971 | static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg) |
23fb93a4 DA |
3972 | { |
3973 | int rc = -ESRCH; | |
3974 | ||
3975 | if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex) | |
3976 | goto out; | |
3977 | ||
3978 | if (cfg->fc_flags & RTF_GATEWAY && | |
3979 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
3980 | goto out; | |
761f6026 XL |
3981 | |
3982 | rc = rt6_remove_exception_rt(rt); | |
23fb93a4 DA |
3983 | out: |
3984 | return rc; | |
3985 | } | |
3986 | ||
0fa6efc5 DA |
3987 | static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt, |
3988 | struct fib6_nh *nh) | |
3989 | { | |
3990 | struct fib6_result res = { | |
3991 | .f6i = rt, | |
3992 | .nh = nh, | |
3993 | }; | |
3994 | struct rt6_info *rt_cache; | |
3995 | ||
3996 | rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src); | |
3997 | if (rt_cache) | |
3998 | return __ip6_del_cached_rt(rt_cache, cfg); | |
3999 | ||
4000 | return 0; | |
4001 | } | |
4002 | ||
5b98324e DA |
4003 | struct fib6_nh_del_cached_rt_arg { |
4004 | struct fib6_config *cfg; | |
4005 | struct fib6_info *f6i; | |
4006 | }; | |
4007 | ||
4008 | static int fib6_nh_del_cached_rt(struct fib6_nh *nh, void *_arg) | |
4009 | { | |
4010 | struct fib6_nh_del_cached_rt_arg *arg = _arg; | |
4011 | int rc; | |
4012 | ||
4013 | rc = ip6_del_cached_rt(arg->cfg, arg->f6i, nh); | |
4014 | return rc != -ESRCH ? rc : 0; | |
4015 | } | |
4016 | ||
4017 | static int ip6_del_cached_rt_nh(struct fib6_config *cfg, struct fib6_info *f6i) | |
4018 | { | |
4019 | struct fib6_nh_del_cached_rt_arg arg = { | |
4020 | .cfg = cfg, | |
4021 | .f6i = f6i | |
4022 | }; | |
4023 | ||
4024 | return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_del_cached_rt, &arg); | |
4025 | } | |
4026 | ||
333c4301 DA |
4027 | static int ip6_route_del(struct fib6_config *cfg, |
4028 | struct netlink_ext_ack *extack) | |
1da177e4 | 4029 | { |
c71099ac | 4030 | struct fib6_table *table; |
8d1c802b | 4031 | struct fib6_info *rt; |
1da177e4 | 4032 | struct fib6_node *fn; |
1da177e4 LT |
4033 | int err = -ESRCH; |
4034 | ||
5578689a | 4035 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
d5d531cb DA |
4036 | if (!table) { |
4037 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); | |
c71099ac | 4038 | return err; |
d5d531cb | 4039 | } |
c71099ac | 4040 | |
66f5d6ce | 4041 | rcu_read_lock(); |
1da177e4 | 4042 | |
c71099ac | 4043 | fn = fib6_locate(&table->tb6_root, |
86872cb5 | 4044 | &cfg->fc_dst, cfg->fc_dst_len, |
38fbeeee | 4045 | &cfg->fc_src, cfg->fc_src_len, |
2b760fcf | 4046 | !(cfg->fc_flags & RTF_CACHE)); |
1ab1457c | 4047 | |
1da177e4 | 4048 | if (fn) { |
66f5d6ce | 4049 | for_each_fib6_node_rt_rcu(fn) { |
ad1601ae DA |
4050 | struct fib6_nh *nh; |
4051 | ||
3401bfb1 SB |
4052 | if (rt->nh && cfg->fc_nh_id && |
4053 | rt->nh->id != cfg->fc_nh_id) | |
5b98324e | 4054 | continue; |
23fb93a4 | 4055 | |
5b98324e DA |
4056 | if (cfg->fc_flags & RTF_CACHE) { |
4057 | int rc = 0; | |
4058 | ||
4059 | if (rt->nh) { | |
4060 | rc = ip6_del_cached_rt_nh(cfg, rt); | |
4061 | } else if (cfg->fc_nh_id) { | |
4062 | continue; | |
4063 | } else { | |
4064 | nh = rt->fib6_nh; | |
4065 | rc = ip6_del_cached_rt(cfg, rt, nh); | |
4066 | } | |
0fa6efc5 DA |
4067 | if (rc != -ESRCH) { |
4068 | rcu_read_unlock(); | |
4069 | return rc; | |
23fb93a4 DA |
4070 | } |
4071 | continue; | |
2b760fcf | 4072 | } |
ad1601ae | 4073 | |
5b98324e DA |
4074 | if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric) |
4075 | continue; | |
4076 | if (cfg->fc_protocol && | |
4077 | cfg->fc_protocol != rt->fib6_protocol) | |
4078 | continue; | |
4079 | ||
4080 | if (rt->nh) { | |
4081 | if (!fib6_info_hold_safe(rt)) | |
4082 | continue; | |
4083 | rcu_read_unlock(); | |
4084 | ||
4085 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
4086 | } | |
4087 | if (cfg->fc_nh_id) | |
4088 | continue; | |
4089 | ||
4090 | nh = rt->fib6_nh; | |
86872cb5 | 4091 | if (cfg->fc_ifindex && |
ad1601ae DA |
4092 | (!nh->fib_nh_dev || |
4093 | nh->fib_nh_dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 4094 | continue; |
86872cb5 | 4095 | if (cfg->fc_flags & RTF_GATEWAY && |
ad1601ae | 4096 | !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6)) |
1da177e4 | 4097 | continue; |
e873e4b9 WW |
4098 | if (!fib6_info_hold_safe(rt)) |
4099 | continue; | |
66f5d6ce | 4100 | rcu_read_unlock(); |
1da177e4 | 4101 | |
0ae81335 DA |
4102 | /* if gateway was specified only delete the one hop */ |
4103 | if (cfg->fc_flags & RTF_GATEWAY) | |
4104 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
4105 | ||
4106 | return __ip6_del_rt_siblings(rt, cfg); | |
1da177e4 LT |
4107 | } |
4108 | } | |
66f5d6ce | 4109 | rcu_read_unlock(); |
1da177e4 LT |
4110 | |
4111 | return err; | |
4112 | } | |
4113 | ||
6700c270 | 4114 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 4115 | { |
a6279458 | 4116 | struct netevent_redirect netevent; |
e8599ff4 | 4117 | struct rt6_info *rt, *nrt = NULL; |
85bd05de | 4118 | struct fib6_result res = {}; |
e8599ff4 DM |
4119 | struct ndisc_options ndopts; |
4120 | struct inet6_dev *in6_dev; | |
4121 | struct neighbour *neigh; | |
71bcdba0 | 4122 | struct rd_msg *msg; |
6e157b6a DM |
4123 | int optlen, on_link; |
4124 | u8 *lladdr; | |
e8599ff4 | 4125 | |
29a3cad5 | 4126 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 4127 | optlen -= sizeof(*msg); |
e8599ff4 DM |
4128 | |
4129 | if (optlen < 0) { | |
6e157b6a | 4130 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
4131 | return; |
4132 | } | |
4133 | ||
71bcdba0 | 4134 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 4135 | |
71bcdba0 | 4136 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 4137 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
4138 | return; |
4139 | } | |
4140 | ||
6e157b6a | 4141 | on_link = 0; |
71bcdba0 | 4142 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 4143 | on_link = 1; |
71bcdba0 | 4144 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 4145 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 4146 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
4147 | return; |
4148 | } | |
4149 | ||
4150 | in6_dev = __in6_dev_get(skb->dev); | |
4151 | if (!in6_dev) | |
4152 | return; | |
2aba913f ED |
4153 | if (READ_ONCE(in6_dev->cnf.forwarding) || |
4154 | !READ_ONCE(in6_dev->cnf.accept_redirects)) | |
e8599ff4 DM |
4155 | return; |
4156 | ||
4157 | /* RFC2461 8.1: | |
4158 | * The IP source address of the Redirect MUST be the same as the current | |
4159 | * first-hop router for the specified ICMP Destination Address. | |
4160 | */ | |
4161 | ||
f997c55c | 4162 | if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
4163 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
4164 | return; | |
4165 | } | |
6e157b6a DM |
4166 | |
4167 | lladdr = NULL; | |
e8599ff4 DM |
4168 | if (ndopts.nd_opts_tgt_lladdr) { |
4169 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
4170 | skb->dev); | |
4171 | if (!lladdr) { | |
4172 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
4173 | return; | |
4174 | } | |
4175 | } | |
4176 | ||
e8dfd42c | 4177 | rt = dst_rt6_info(dst); |
ec13ad1d | 4178 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 4179 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 4180 | return; |
6e157b6a | 4181 | } |
e8599ff4 | 4182 | |
6e157b6a DM |
4183 | /* Redirect received -> path was valid. |
4184 | * Look, redirects are sent only in response to data packets, | |
4185 | * so that this nexthop apparently is reachable. --ANK | |
4186 | */ | |
0dec879f | 4187 | dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr); |
a6279458 | 4188 | |
71bcdba0 | 4189 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
4190 | if (!neigh) |
4191 | return; | |
a6279458 | 4192 | |
1da177e4 LT |
4193 | /* |
4194 | * We have finally decided to accept it. | |
4195 | */ | |
4196 | ||
f997c55c | 4197 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
4198 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
4199 | NEIGH_UPDATE_F_OVERRIDE| | |
4200 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
4201 | NEIGH_UPDATE_F_ISROUTER)), |
4202 | NDISC_REDIRECT, &ndopts); | |
1da177e4 | 4203 | |
4d85cd0c | 4204 | rcu_read_lock(); |
85bd05de | 4205 | res.f6i = rcu_dereference(rt->from); |
ff24e498 | 4206 | if (!res.f6i) |
886b7a50 | 4207 | goto out; |
8a14e46f | 4208 | |
49d5b8ef DA |
4209 | if (res.f6i->nh) { |
4210 | struct fib6_nh_match_arg arg = { | |
4211 | .dev = dst->dev, | |
4212 | .gw = &rt->rt6i_gateway, | |
4213 | }; | |
4214 | ||
4215 | nexthop_for_each_fib6_nh(res.f6i->nh, | |
4216 | fib6_nh_find_match, &arg); | |
4217 | ||
4218 | /* fib6_info uses a nexthop that does not have fib6_nh | |
4219 | * using the dst->dev. Should be impossible | |
4220 | */ | |
4221 | if (!arg.match) | |
4222 | goto out; | |
4223 | res.nh = arg.match; | |
4224 | } else { | |
4225 | res.nh = res.f6i->fib6_nh; | |
4226 | } | |
4227 | ||
7d21fec9 DA |
4228 | res.fib6_flags = res.f6i->fib6_flags; |
4229 | res.fib6_type = res.f6i->fib6_type; | |
85bd05de | 4230 | nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL); |
38308473 | 4231 | if (!nrt) |
1da177e4 LT |
4232 | goto out; |
4233 | ||
4234 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
4235 | if (on_link) | |
4236 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
4237 | ||
4e3fd7a0 | 4238 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 4239 | |
886b7a50 | 4240 | /* rt6_insert_exception() will take care of duplicated exceptions */ |
5012f0a5 | 4241 | if (rt6_insert_exception(nrt, &res)) { |
2b760fcf WW |
4242 | dst_release_immediate(&nrt->dst); |
4243 | goto out; | |
4244 | } | |
1da177e4 | 4245 | |
d8d1f30b CG |
4246 | netevent.old = &rt->dst; |
4247 | netevent.new = &nrt->dst; | |
71bcdba0 | 4248 | netevent.daddr = &msg->dest; |
60592833 | 4249 | netevent.neigh = neigh; |
8d71740c TT |
4250 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
4251 | ||
1da177e4 | 4252 | out: |
886b7a50 | 4253 | rcu_read_unlock(); |
e8599ff4 | 4254 | neigh_release(neigh); |
6e157b6a DM |
4255 | } |
4256 | ||
70ceb4f5 | 4257 | #ifdef CONFIG_IPV6_ROUTE_INFO |
8d1c802b | 4258 | static struct fib6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 4259 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
4260 | const struct in6_addr *gwaddr, |
4261 | struct net_device *dev) | |
70ceb4f5 | 4262 | { |
830218c1 DA |
4263 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
4264 | int ifindex = dev->ifindex; | |
70ceb4f5 | 4265 | struct fib6_node *fn; |
8d1c802b | 4266 | struct fib6_info *rt = NULL; |
c71099ac TG |
4267 | struct fib6_table *table; |
4268 | ||
830218c1 | 4269 | table = fib6_get_table(net, tb_id); |
38308473 | 4270 | if (!table) |
c71099ac | 4271 | return NULL; |
70ceb4f5 | 4272 | |
66f5d6ce | 4273 | rcu_read_lock(); |
38fbeeee | 4274 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true); |
70ceb4f5 YH |
4275 | if (!fn) |
4276 | goto out; | |
4277 | ||
66f5d6ce | 4278 | for_each_fib6_node_rt_rcu(fn) { |
f88d8ea6 DA |
4279 | /* these routes do not use nexthops */ |
4280 | if (rt->nh) | |
4281 | continue; | |
1cf844c7 | 4282 | if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex) |
70ceb4f5 | 4283 | continue; |
2b2450ca | 4284 | if (!(rt->fib6_flags & RTF_ROUTEINFO) || |
1cf844c7 | 4285 | !rt->fib6_nh->fib_nh_gw_family) |
70ceb4f5 | 4286 | continue; |
1cf844c7 | 4287 | if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr)) |
70ceb4f5 | 4288 | continue; |
e873e4b9 WW |
4289 | if (!fib6_info_hold_safe(rt)) |
4290 | continue; | |
70ceb4f5 YH |
4291 | break; |
4292 | } | |
4293 | out: | |
66f5d6ce | 4294 | rcu_read_unlock(); |
70ceb4f5 YH |
4295 | return rt; |
4296 | } | |
4297 | ||
8d1c802b | 4298 | static struct fib6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 4299 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
4300 | const struct in6_addr *gwaddr, |
4301 | struct net_device *dev, | |
95c96174 | 4302 | unsigned int pref) |
70ceb4f5 | 4303 | { |
86872cb5 | 4304 | struct fib6_config cfg = { |
238fc7ea | 4305 | .fc_metric = IP6_RT_PRIO_USER, |
830218c1 | 4306 | .fc_ifindex = dev->ifindex, |
86872cb5 TG |
4307 | .fc_dst_len = prefixlen, |
4308 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
4309 | RTF_UP | RTF_PREF(pref), | |
b91d5329 | 4310 | .fc_protocol = RTPROT_RA, |
e8478e80 | 4311 | .fc_type = RTN_UNICAST, |
15e47304 | 4312 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
4313 | .fc_nlinfo.nlh = NULL, |
4314 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
4315 | }; |
4316 | ||
91b2c9a0 | 4317 | cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
4e3fd7a0 AD |
4318 | cfg.fc_dst = *prefix; |
4319 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 4320 | |
e317da96 YH |
4321 | /* We should treat it as a default route if prefix length is 0. */ |
4322 | if (!prefixlen) | |
86872cb5 | 4323 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 4324 | |
acb54e3c | 4325 | ip6_route_add(&cfg, GFP_ATOMIC, NULL); |
70ceb4f5 | 4326 | |
830218c1 | 4327 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev); |
70ceb4f5 YH |
4328 | } |
4329 | #endif | |
4330 | ||
8d1c802b | 4331 | struct fib6_info *rt6_get_dflt_router(struct net *net, |
afb1d4b5 DA |
4332 | const struct in6_addr *addr, |
4333 | struct net_device *dev) | |
1ab1457c | 4334 | { |
830218c1 | 4335 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT; |
8d1c802b | 4336 | struct fib6_info *rt; |
c71099ac | 4337 | struct fib6_table *table; |
1da177e4 | 4338 | |
afb1d4b5 | 4339 | table = fib6_get_table(net, tb_id); |
38308473 | 4340 | if (!table) |
c71099ac | 4341 | return NULL; |
1da177e4 | 4342 | |
66f5d6ce WW |
4343 | rcu_read_lock(); |
4344 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
f88d8ea6 | 4345 | struct fib6_nh *nh; |
ad1601ae | 4346 | |
f88d8ea6 DA |
4347 | /* RA routes do not use nexthops */ |
4348 | if (rt->nh) | |
4349 | continue; | |
4350 | ||
4351 | nh = rt->fib6_nh; | |
ad1601ae | 4352 | if (dev == nh->fib_nh_dev && |
93c2fb25 | 4353 | ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
ad1601ae | 4354 | ipv6_addr_equal(&nh->fib_nh_gw6, addr)) |
1da177e4 LT |
4355 | break; |
4356 | } | |
e873e4b9 WW |
4357 | if (rt && !fib6_info_hold_safe(rt)) |
4358 | rt = NULL; | |
66f5d6ce | 4359 | rcu_read_unlock(); |
1da177e4 LT |
4360 | return rt; |
4361 | } | |
4362 | ||
8d1c802b | 4363 | struct fib6_info *rt6_add_dflt_router(struct net *net, |
afb1d4b5 | 4364 | const struct in6_addr *gwaddr, |
ebacaaa0 | 4365 | struct net_device *dev, |
6b2e04bc | 4366 | unsigned int pref, |
129e406e KFL |
4367 | u32 defrtr_usr_metric, |
4368 | int lifetime) | |
1da177e4 | 4369 | { |
86872cb5 | 4370 | struct fib6_config cfg = { |
ca254490 | 4371 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
6b2e04bc | 4372 | .fc_metric = defrtr_usr_metric, |
86872cb5 TG |
4373 | .fc_ifindex = dev->ifindex, |
4374 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
4375 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
b91d5329 | 4376 | .fc_protocol = RTPROT_RA, |
e8478e80 | 4377 | .fc_type = RTN_UNICAST, |
15e47304 | 4378 | .fc_nlinfo.portid = 0, |
5578689a | 4379 | .fc_nlinfo.nlh = NULL, |
afb1d4b5 | 4380 | .fc_nlinfo.nl_net = net, |
129e406e | 4381 | .fc_expires = jiffies_to_clock_t(lifetime * HZ), |
86872cb5 | 4382 | }; |
1da177e4 | 4383 | |
4e3fd7a0 | 4384 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 4385 | |
acb54e3c | 4386 | if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) { |
830218c1 DA |
4387 | struct fib6_table *table; |
4388 | ||
4389 | table = fib6_get_table(dev_net(dev), cfg.fc_table); | |
4390 | if (table) | |
4391 | table->flags |= RT6_TABLE_HAS_DFLT_ROUTER; | |
4392 | } | |
1da177e4 | 4393 | |
afb1d4b5 | 4394 | return rt6_get_dflt_router(net, gwaddr, dev); |
1da177e4 LT |
4395 | } |
4396 | ||
afb1d4b5 DA |
4397 | static void __rt6_purge_dflt_routers(struct net *net, |
4398 | struct fib6_table *table) | |
1da177e4 | 4399 | { |
8d1c802b | 4400 | struct fib6_info *rt; |
1da177e4 LT |
4401 | |
4402 | restart: | |
66f5d6ce WW |
4403 | rcu_read_lock(); |
4404 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
dcd1f572 DA |
4405 | struct net_device *dev = fib6_info_nh_dev(rt); |
4406 | struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL; | |
4407 | ||
93c2fb25 | 4408 | if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
e873e4b9 WW |
4409 | (!idev || idev->cnf.accept_ra != 2) && |
4410 | fib6_info_hold_safe(rt)) { | |
93531c67 | 4411 | rcu_read_unlock(); |
11dd74b3 | 4412 | ip6_del_rt(net, rt, false); |
1da177e4 LT |
4413 | goto restart; |
4414 | } | |
4415 | } | |
66f5d6ce | 4416 | rcu_read_unlock(); |
830218c1 DA |
4417 | |
4418 | table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER; | |
4419 | } | |
4420 | ||
4421 | void rt6_purge_dflt_routers(struct net *net) | |
4422 | { | |
4423 | struct fib6_table *table; | |
4424 | struct hlist_head *head; | |
4425 | unsigned int h; | |
4426 | ||
4427 | rcu_read_lock(); | |
4428 | ||
4429 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
4430 | head = &net->ipv6.fib_table_hash[h]; | |
4431 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { | |
4432 | if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER) | |
afb1d4b5 | 4433 | __rt6_purge_dflt_routers(net, table); |
830218c1 DA |
4434 | } |
4435 | } | |
4436 | ||
4437 | rcu_read_unlock(); | |
1da177e4 LT |
4438 | } |
4439 | ||
5578689a DL |
4440 | static void rtmsg_to_fib6_config(struct net *net, |
4441 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
4442 | struct fib6_config *cfg) |
4443 | { | |
8823a3ac MŻ |
4444 | *cfg = (struct fib6_config){ |
4445 | .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? | |
4446 | : RT6_TABLE_MAIN, | |
4447 | .fc_ifindex = rtmsg->rtmsg_ifindex, | |
67f69513 | 4448 | .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER, |
8823a3ac MŻ |
4449 | .fc_expires = rtmsg->rtmsg_info, |
4450 | .fc_dst_len = rtmsg->rtmsg_dst_len, | |
4451 | .fc_src_len = rtmsg->rtmsg_src_len, | |
4452 | .fc_flags = rtmsg->rtmsg_flags, | |
4453 | .fc_type = rtmsg->rtmsg_type, | |
4454 | ||
4455 | .fc_nlinfo.nl_net = net, | |
4456 | ||
4457 | .fc_dst = rtmsg->rtmsg_dst, | |
4458 | .fc_src = rtmsg->rtmsg_src, | |
4459 | .fc_gateway = rtmsg->rtmsg_gateway, | |
4460 | }; | |
86872cb5 TG |
4461 | } |
4462 | ||
7c1552da | 4463 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, struct in6_rtmsg *rtmsg) |
1da177e4 | 4464 | { |
86872cb5 | 4465 | struct fib6_config cfg; |
1da177e4 LT |
4466 | int err; |
4467 | ||
7c1552da CH |
4468 | if (cmd != SIOCADDRT && cmd != SIOCDELRT) |
4469 | return -EINVAL; | |
4470 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
4471 | return -EPERM; | |
86872cb5 | 4472 | |
7c1552da | 4473 | rtmsg_to_fib6_config(net, rtmsg, &cfg); |
1da177e4 | 4474 | |
7c1552da CH |
4475 | rtnl_lock(); |
4476 | switch (cmd) { | |
4477 | case SIOCADDRT: | |
4478 | err = ip6_route_add(&cfg, GFP_KERNEL, NULL); | |
4479 | break; | |
4480 | case SIOCDELRT: | |
4481 | err = ip6_route_del(&cfg, NULL); | |
4482 | break; | |
3ff50b79 | 4483 | } |
7c1552da CH |
4484 | rtnl_unlock(); |
4485 | return err; | |
1da177e4 LT |
4486 | } |
4487 | ||
4488 | /* | |
4489 | * Drop the packet on the floor | |
4490 | */ | |
4491 | ||
d5fdd6ba | 4492 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 4493 | { |
adf30907 | 4494 | struct dst_entry *dst = skb_dst(skb); |
1d3fd8a1 SS |
4495 | struct net *net = dev_net(dst->dev); |
4496 | struct inet6_dev *idev; | |
3ae42cc8 | 4497 | SKB_DR(reason); |
1d3fd8a1 SS |
4498 | int type; |
4499 | ||
1158f79f | 4500 | if (netif_is_l3_master(skb->dev) || |
1d3fd8a1 SS |
4501 | dst->dev == net->loopback_dev) |
4502 | idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif)); | |
4503 | else | |
4504 | idev = ip6_dst_idev(dst); | |
4505 | ||
612f09e8 YH |
4506 | switch (ipstats_mib_noroutes) { |
4507 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 4508 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 4509 | if (type == IPV6_ADDR_ANY) { |
3ae42cc8 | 4510 | SKB_DR_SET(reason, IP_INADDRERRORS); |
1d3fd8a1 | 4511 | IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
612f09e8 YH |
4512 | break; |
4513 | } | |
3ae42cc8 | 4514 | SKB_DR_SET(reason, IP_INNOROUTES); |
a8eceea8 | 4515 | fallthrough; |
612f09e8 | 4516 | case IPSTATS_MIB_OUTNOROUTES: |
3ae42cc8 | 4517 | SKB_DR_OR(reason, IP_OUTNOROUTES); |
1d3fd8a1 | 4518 | IP6_INC_STATS(net, idev, ipstats_mib_noroutes); |
612f09e8 YH |
4519 | break; |
4520 | } | |
1d3fd8a1 SS |
4521 | |
4522 | /* Start over by dropping the dst for l3mdev case */ | |
4523 | if (netif_is_l3_master(skb->dev)) | |
4524 | skb_dst_drop(skb); | |
4525 | ||
3ffe533c | 4526 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
3ae42cc8 | 4527 | kfree_skb_reason(skb, reason); |
1da177e4 LT |
4528 | return 0; |
4529 | } | |
4530 | ||
9ce8ade0 TG |
4531 | static int ip6_pkt_discard(struct sk_buff *skb) |
4532 | { | |
612f09e8 | 4533 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
4534 | } |
4535 | ||
ede2059d | 4536 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 4537 | { |
adf30907 | 4538 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 4539 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
4540 | } |
4541 | ||
9ce8ade0 TG |
4542 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
4543 | { | |
612f09e8 | 4544 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
4545 | } |
4546 | ||
ede2059d | 4547 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 4548 | { |
adf30907 | 4549 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 4550 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
4551 | } |
4552 | ||
1da177e4 LT |
4553 | /* |
4554 | * Allocate a dst for local (unicast / anycast) address. | |
4555 | */ | |
4556 | ||
360a9887 DA |
4557 | struct fib6_info *addrconf_f6i_alloc(struct net *net, |
4558 | struct inet6_dev *idev, | |
4559 | const struct in6_addr *addr, | |
7f6c4039 HL |
4560 | bool anycast, gfp_t gfp_flags, |
4561 | struct netlink_ext_ack *extack) | |
1da177e4 | 4562 | { |
c7a1ce39 DA |
4563 | struct fib6_config cfg = { |
4564 | .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL, | |
4565 | .fc_ifindex = idev->dev->ifindex, | |
d55a2e37 | 4566 | .fc_flags = RTF_UP | RTF_NONEXTHOP, |
c7a1ce39 DA |
4567 | .fc_dst = *addr, |
4568 | .fc_dst_len = 128, | |
4569 | .fc_protocol = RTPROT_KERNEL, | |
4570 | .fc_nlinfo.nl_net = net, | |
4571 | .fc_ignore_dev_down = true, | |
4572 | }; | |
d55a2e37 | 4573 | struct fib6_info *f6i; |
1da177e4 | 4574 | |
e8478e80 | 4575 | if (anycast) { |
c7a1ce39 DA |
4576 | cfg.fc_type = RTN_ANYCAST; |
4577 | cfg.fc_flags |= RTF_ANYCAST; | |
e8478e80 | 4578 | } else { |
c7a1ce39 DA |
4579 | cfg.fc_type = RTN_LOCAL; |
4580 | cfg.fc_flags |= RTF_LOCAL; | |
e8478e80 | 4581 | } |
1da177e4 | 4582 | |
7f6c4039 | 4583 | f6i = ip6_route_info_create(&cfg, gfp_flags, extack); |
3b0dc529 | 4584 | if (!IS_ERR(f6i)) { |
d55a2e37 | 4585 | f6i->dst_nocount = true; |
3b0dc529 ND |
4586 | |
4587 | if (!anycast && | |
624d5aec ED |
4588 | (READ_ONCE(net->ipv6.devconf_all->disable_policy) || |
4589 | READ_ONCE(idev->cnf.disable_policy))) | |
3b0dc529 ND |
4590 | f6i->dst_nopolicy = true; |
4591 | } | |
4592 | ||
d55a2e37 | 4593 | return f6i; |
1da177e4 LT |
4594 | } |
4595 | ||
c3968a85 DW |
4596 | /* remove deleted ip from prefsrc entries */ |
4597 | struct arg_dev_net_ip { | |
c3968a85 DW |
4598 | struct net *net; |
4599 | struct in6_addr *addr; | |
4600 | }; | |
4601 | ||
8d1c802b | 4602 | static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg) |
c3968a85 | 4603 | { |
c3968a85 DW |
4604 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; |
4605 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
4606 | ||
f88d8ea6 | 4607 | if (!rt->nh && |
421842ed | 4608 | rt != net->ipv6.fib6_null_entry && |
b358f57f HL |
4609 | ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr) && |
4610 | !ipv6_chk_addr(net, addr, rt->fib6_nh->fib_nh_dev, 0)) { | |
60006a48 | 4611 | spin_lock_bh(&rt6_exception_lock); |
c3968a85 | 4612 | /* remove prefsrc entry */ |
93c2fb25 | 4613 | rt->fib6_prefsrc.plen = 0; |
60006a48 | 4614 | spin_unlock_bh(&rt6_exception_lock); |
c3968a85 DW |
4615 | } |
4616 | return 0; | |
4617 | } | |
4618 | ||
4619 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
4620 | { | |
4621 | struct net *net = dev_net(ifp->idev->dev); | |
4622 | struct arg_dev_net_ip adni = { | |
c3968a85 DW |
4623 | .net = net, |
4624 | .addr = &ifp->addr, | |
4625 | }; | |
0c3584d5 | 4626 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
4627 | } |
4628 | ||
2b2450ca | 4629 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT) |
be7a010d DJ |
4630 | |
4631 | /* Remove routers and update dst entries when gateway turn into host. */ | |
8d1c802b | 4632 | static int fib6_clean_tohost(struct fib6_info *rt, void *arg) |
be7a010d DJ |
4633 | { |
4634 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
f88d8ea6 DA |
4635 | struct fib6_nh *nh; |
4636 | ||
4637 | /* RA routes do not use nexthops */ | |
4638 | if (rt->nh) | |
4639 | return 0; | |
be7a010d | 4640 | |
f88d8ea6 | 4641 | nh = rt->fib6_nh; |
93c2fb25 | 4642 | if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) && |
cc5c073a | 4643 | nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6)) |
be7a010d | 4644 | return -1; |
b16cb459 WW |
4645 | |
4646 | /* Further clean up cached routes in exception table. | |
4647 | * This is needed because cached route may have a different | |
4648 | * gateway than its 'parent' in the case of an ip redirect. | |
4649 | */ | |
cc5c073a | 4650 | fib6_nh_exceptions_clean_tohost(nh, gateway); |
b16cb459 | 4651 | |
be7a010d DJ |
4652 | return 0; |
4653 | } | |
4654 | ||
4655 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
4656 | { | |
4657 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
4658 | } | |
4659 | ||
2127d95a IS |
4660 | struct arg_netdev_event { |
4661 | const struct net_device *dev; | |
4c981e28 | 4662 | union { |
ecc5663c | 4663 | unsigned char nh_flags; |
4c981e28 IS |
4664 | unsigned long event; |
4665 | }; | |
2127d95a IS |
4666 | }; |
4667 | ||
8d1c802b | 4668 | static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt) |
d7dedee1 | 4669 | { |
8d1c802b | 4670 | struct fib6_info *iter; |
d7dedee1 IS |
4671 | struct fib6_node *fn; |
4672 | ||
93c2fb25 DA |
4673 | fn = rcu_dereference_protected(rt->fib6_node, |
4674 | lockdep_is_held(&rt->fib6_table->tb6_lock)); | |
d7dedee1 | 4675 | iter = rcu_dereference_protected(fn->leaf, |
93c2fb25 | 4676 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 | 4677 | while (iter) { |
93c2fb25 | 4678 | if (iter->fib6_metric == rt->fib6_metric && |
33bd5ac5 | 4679 | rt6_qualify_for_ecmp(iter)) |
d7dedee1 | 4680 | return iter; |
8fb11a9a | 4681 | iter = rcu_dereference_protected(iter->fib6_next, |
93c2fb25 | 4682 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 IS |
4683 | } |
4684 | ||
4685 | return NULL; | |
4686 | } | |
4687 | ||
f88d8ea6 | 4688 | /* only called for fib entries with builtin fib6_nh */ |
8d1c802b | 4689 | static bool rt6_is_dead(const struct fib6_info *rt) |
d7dedee1 | 4690 | { |
1cf844c7 DA |
4691 | if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD || |
4692 | (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN && | |
4693 | ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev))) | |
d7dedee1 IS |
4694 | return true; |
4695 | ||
4696 | return false; | |
4697 | } | |
4698 | ||
8d1c802b | 4699 | static int rt6_multipath_total_weight(const struct fib6_info *rt) |
d7dedee1 | 4700 | { |
8d1c802b | 4701 | struct fib6_info *iter; |
d7dedee1 IS |
4702 | int total = 0; |
4703 | ||
4704 | if (!rt6_is_dead(rt)) | |
1cf844c7 | 4705 | total += rt->fib6_nh->fib_nh_weight; |
d7dedee1 | 4706 | |
93c2fb25 | 4707 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) { |
d7dedee1 | 4708 | if (!rt6_is_dead(iter)) |
1cf844c7 | 4709 | total += iter->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4710 | } |
4711 | ||
4712 | return total; | |
4713 | } | |
4714 | ||
8d1c802b | 4715 | static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total) |
d7dedee1 IS |
4716 | { |
4717 | int upper_bound = -1; | |
4718 | ||
4719 | if (!rt6_is_dead(rt)) { | |
1cf844c7 | 4720 | *weight += rt->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4721 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31, |
4722 | total) - 1; | |
4723 | } | |
1cf844c7 | 4724 | atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound); |
d7dedee1 IS |
4725 | } |
4726 | ||
8d1c802b | 4727 | static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total) |
d7dedee1 | 4728 | { |
8d1c802b | 4729 | struct fib6_info *iter; |
d7dedee1 IS |
4730 | int weight = 0; |
4731 | ||
4732 | rt6_upper_bound_set(rt, &weight, total); | |
4733 | ||
93c2fb25 | 4734 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
d7dedee1 IS |
4735 | rt6_upper_bound_set(iter, &weight, total); |
4736 | } | |
4737 | ||
8d1c802b | 4738 | void rt6_multipath_rebalance(struct fib6_info *rt) |
d7dedee1 | 4739 | { |
8d1c802b | 4740 | struct fib6_info *first; |
d7dedee1 IS |
4741 | int total; |
4742 | ||
4743 | /* In case the entire multipath route was marked for flushing, | |
4744 | * then there is no need to rebalance upon the removal of every | |
4745 | * sibling route. | |
4746 | */ | |
93c2fb25 | 4747 | if (!rt->fib6_nsiblings || rt->should_flush) |
d7dedee1 IS |
4748 | return; |
4749 | ||
4750 | /* During lookup routes are evaluated in order, so we need to | |
4751 | * make sure upper bounds are assigned from the first sibling | |
4752 | * onwards. | |
4753 | */ | |
4754 | first = rt6_multipath_first_sibling(rt); | |
4755 | if (WARN_ON_ONCE(!first)) | |
4756 | return; | |
4757 | ||
4758 | total = rt6_multipath_total_weight(first); | |
4759 | rt6_multipath_upper_bound_set(first, total); | |
4760 | } | |
4761 | ||
8d1c802b | 4762 | static int fib6_ifup(struct fib6_info *rt, void *p_arg) |
2127d95a IS |
4763 | { |
4764 | const struct arg_netdev_event *arg = p_arg; | |
7aef6859 | 4765 | struct net *net = dev_net(arg->dev); |
2127d95a | 4766 | |
f88d8ea6 | 4767 | if (rt != net->ipv6.fib6_null_entry && !rt->nh && |
1cf844c7 DA |
4768 | rt->fib6_nh->fib_nh_dev == arg->dev) { |
4769 | rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags; | |
7aef6859 | 4770 | fib6_update_sernum_upto_root(net, rt); |
d7dedee1 | 4771 | rt6_multipath_rebalance(rt); |
1de178ed | 4772 | } |
2127d95a IS |
4773 | |
4774 | return 0; | |
4775 | } | |
4776 | ||
ecc5663c | 4777 | void rt6_sync_up(struct net_device *dev, unsigned char nh_flags) |
2127d95a IS |
4778 | { |
4779 | struct arg_netdev_event arg = { | |
4780 | .dev = dev, | |
6802f3ad IS |
4781 | { |
4782 | .nh_flags = nh_flags, | |
4783 | }, | |
2127d95a IS |
4784 | }; |
4785 | ||
4786 | if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev)) | |
4787 | arg.nh_flags |= RTNH_F_LINKDOWN; | |
4788 | ||
4789 | fib6_clean_all(dev_net(dev), fib6_ifup, &arg); | |
4790 | } | |
4791 | ||
f88d8ea6 | 4792 | /* only called for fib entries with inline fib6_nh */ |
8d1c802b | 4793 | static bool rt6_multipath_uses_dev(const struct fib6_info *rt, |
1de178ed IS |
4794 | const struct net_device *dev) |
4795 | { | |
8d1c802b | 4796 | struct fib6_info *iter; |
1de178ed | 4797 | |
1cf844c7 | 4798 | if (rt->fib6_nh->fib_nh_dev == dev) |
1de178ed | 4799 | return true; |
93c2fb25 | 4800 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 | 4801 | if (iter->fib6_nh->fib_nh_dev == dev) |
1de178ed IS |
4802 | return true; |
4803 | ||
4804 | return false; | |
4805 | } | |
4806 | ||
8d1c802b | 4807 | static void rt6_multipath_flush(struct fib6_info *rt) |
1de178ed | 4808 | { |
8d1c802b | 4809 | struct fib6_info *iter; |
1de178ed IS |
4810 | |
4811 | rt->should_flush = 1; | |
93c2fb25 | 4812 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1de178ed IS |
4813 | iter->should_flush = 1; |
4814 | } | |
4815 | ||
8d1c802b | 4816 | static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt, |
1de178ed IS |
4817 | const struct net_device *down_dev) |
4818 | { | |
8d1c802b | 4819 | struct fib6_info *iter; |
1de178ed IS |
4820 | unsigned int dead = 0; |
4821 | ||
1cf844c7 DA |
4822 | if (rt->fib6_nh->fib_nh_dev == down_dev || |
4823 | rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed | 4824 | dead++; |
93c2fb25 | 4825 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4826 | if (iter->fib6_nh->fib_nh_dev == down_dev || |
4827 | iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed IS |
4828 | dead++; |
4829 | ||
4830 | return dead; | |
4831 | } | |
4832 | ||
8d1c802b | 4833 | static void rt6_multipath_nh_flags_set(struct fib6_info *rt, |
1de178ed | 4834 | const struct net_device *dev, |
ecc5663c | 4835 | unsigned char nh_flags) |
1de178ed | 4836 | { |
8d1c802b | 4837 | struct fib6_info *iter; |
1de178ed | 4838 | |
1cf844c7 DA |
4839 | if (rt->fib6_nh->fib_nh_dev == dev) |
4840 | rt->fib6_nh->fib_nh_flags |= nh_flags; | |
93c2fb25 | 4841 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4842 | if (iter->fib6_nh->fib_nh_dev == dev) |
4843 | iter->fib6_nh->fib_nh_flags |= nh_flags; | |
1de178ed IS |
4844 | } |
4845 | ||
a1a22c12 | 4846 | /* called with write lock held for table with rt */ |
8d1c802b | 4847 | static int fib6_ifdown(struct fib6_info *rt, void *p_arg) |
1da177e4 | 4848 | { |
4c981e28 IS |
4849 | const struct arg_netdev_event *arg = p_arg; |
4850 | const struct net_device *dev = arg->dev; | |
7aef6859 | 4851 | struct net *net = dev_net(dev); |
8ed67789 | 4852 | |
f88d8ea6 | 4853 | if (rt == net->ipv6.fib6_null_entry || rt->nh) |
27c6fa73 IS |
4854 | return 0; |
4855 | ||
4856 | switch (arg->event) { | |
4857 | case NETDEV_UNREGISTER: | |
1cf844c7 | 4858 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
27c6fa73 | 4859 | case NETDEV_DOWN: |
1de178ed | 4860 | if (rt->should_flush) |
27c6fa73 | 4861 | return -1; |
93c2fb25 | 4862 | if (!rt->fib6_nsiblings) |
1cf844c7 | 4863 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
1de178ed IS |
4864 | if (rt6_multipath_uses_dev(rt, dev)) { |
4865 | unsigned int count; | |
4866 | ||
4867 | count = rt6_multipath_dead_count(rt, dev); | |
93c2fb25 | 4868 | if (rt->fib6_nsiblings + 1 == count) { |
1de178ed IS |
4869 | rt6_multipath_flush(rt); |
4870 | return -1; | |
4871 | } | |
4872 | rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD | | |
4873 | RTNH_F_LINKDOWN); | |
7aef6859 | 4874 | fib6_update_sernum(net, rt); |
d7dedee1 | 4875 | rt6_multipath_rebalance(rt); |
1de178ed IS |
4876 | } |
4877 | return -2; | |
27c6fa73 | 4878 | case NETDEV_CHANGE: |
1cf844c7 | 4879 | if (rt->fib6_nh->fib_nh_dev != dev || |
93c2fb25 | 4880 | rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) |
27c6fa73 | 4881 | break; |
1cf844c7 | 4882 | rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
d7dedee1 | 4883 | rt6_multipath_rebalance(rt); |
27c6fa73 | 4884 | break; |
2b241361 | 4885 | } |
c159d30c | 4886 | |
1da177e4 LT |
4887 | return 0; |
4888 | } | |
4889 | ||
27c6fa73 | 4890 | void rt6_sync_down_dev(struct net_device *dev, unsigned long event) |
1da177e4 | 4891 | { |
4c981e28 | 4892 | struct arg_netdev_event arg = { |
8ed67789 | 4893 | .dev = dev, |
6802f3ad IS |
4894 | { |
4895 | .event = event, | |
4896 | }, | |
8ed67789 | 4897 | }; |
7c6bb7d2 | 4898 | struct net *net = dev_net(dev); |
8ed67789 | 4899 | |
7c6bb7d2 DA |
4900 | if (net->ipv6.sysctl.skip_notify_on_dev_down) |
4901 | fib6_clean_all_skip_notify(net, fib6_ifdown, &arg); | |
4902 | else | |
4903 | fib6_clean_all(net, fib6_ifdown, &arg); | |
4c981e28 IS |
4904 | } |
4905 | ||
4906 | void rt6_disable_ip(struct net_device *dev, unsigned long event) | |
4907 | { | |
4908 | rt6_sync_down_dev(dev, event); | |
e5f80fcf | 4909 | rt6_uncached_list_flush_dev(dev); |
4c981e28 | 4910 | neigh_ifdown(&nd_tbl, dev); |
1da177e4 LT |
4911 | } |
4912 | ||
95c96174 | 4913 | struct rt6_mtu_change_arg { |
1da177e4 | 4914 | struct net_device *dev; |
95c96174 | 4915 | unsigned int mtu; |
c0b220cf | 4916 | struct fib6_info *f6i; |
1da177e4 LT |
4917 | }; |
4918 | ||
cc5c073a | 4919 | static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg) |
c0b220cf DA |
4920 | { |
4921 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg; | |
cc5c073a | 4922 | struct fib6_info *f6i = arg->f6i; |
c0b220cf DA |
4923 | |
4924 | /* For administrative MTU increase, there is no way to discover | |
4925 | * IPv6 PMTU increase, so PMTU increase should be updated here. | |
4926 | * Since RFC 1981 doesn't include administrative MTU increase | |
4927 | * update PMTU increase is a MUST. (i.e. jumbo frame) | |
4928 | */ | |
4929 | if (nh->fib_nh_dev == arg->dev) { | |
4930 | struct inet6_dev *idev = __in6_dev_get(arg->dev); | |
4931 | u32 mtu = f6i->fib6_pmtu; | |
4932 | ||
4933 | if (mtu >= arg->mtu || | |
4934 | (mtu < arg->mtu && mtu == idev->cnf.mtu6)) | |
4935 | fib6_metric_set(f6i, RTAX_MTU, arg->mtu); | |
4936 | ||
4937 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 4938 | rt6_exceptions_update_pmtu(idev, nh, arg->mtu); |
c0b220cf DA |
4939 | spin_unlock_bh(&rt6_exception_lock); |
4940 | } | |
4941 | ||
4942 | return 0; | |
4943 | } | |
4944 | ||
4945 | static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg) | |
1da177e4 LT |
4946 | { |
4947 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
4948 | struct inet6_dev *idev; | |
4949 | ||
4950 | /* In IPv6 pmtu discovery is not optional, | |
4951 | so that RTAX_MTU lock cannot disable it. | |
4952 | We still use this lock to block changes | |
4953 | caused by addrconf/ndisc. | |
4954 | */ | |
4955 | ||
4956 | idev = __in6_dev_get(arg->dev); | |
38308473 | 4957 | if (!idev) |
1da177e4 LT |
4958 | return 0; |
4959 | ||
c0b220cf DA |
4960 | if (fib6_metric_locked(f6i, RTAX_MTU)) |
4961 | return 0; | |
d4ead6b3 | 4962 | |
c0b220cf | 4963 | arg->f6i = f6i; |
2d44234b DA |
4964 | if (f6i->nh) { |
4965 | /* fib6_nh_mtu_change only returns 0, so this is safe */ | |
4966 | return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_mtu_change, | |
4967 | arg); | |
4968 | } | |
4969 | ||
1cf844c7 | 4970 | return fib6_nh_mtu_change(f6i->fib6_nh, arg); |
1da177e4 LT |
4971 | } |
4972 | ||
95c96174 | 4973 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 4974 | { |
c71099ac TG |
4975 | struct rt6_mtu_change_arg arg = { |
4976 | .dev = dev, | |
4977 | .mtu = mtu, | |
4978 | }; | |
1da177e4 | 4979 | |
0c3584d5 | 4980 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
4981 | } |
4982 | ||
ef7c79ed | 4983 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
75425657 | 4984 | [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 }, |
5176f91e | 4985 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
aa8f8778 | 4986 | [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 4987 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 4988 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
4989 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
4990 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 4991 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 4992 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
4993 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
4994 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 4995 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
622ec2c9 | 4996 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 4997 | [RTA_MARK] = { .type = NLA_U32 }, |
aa8f8778 | 4998 | [RTA_TABLE] = { .type = NLA_U32 }, |
eacb9384 RP |
4999 | [RTA_IP_PROTO] = { .type = NLA_U8 }, |
5000 | [RTA_SPORT] = { .type = NLA_U16 }, | |
5001 | [RTA_DPORT] = { .type = NLA_U16 }, | |
5b98324e | 5002 | [RTA_NH_ID] = { .type = NLA_U32 }, |
86872cb5 TG |
5003 | }; |
5004 | ||
5005 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
333c4301 DA |
5006 | struct fib6_config *cfg, |
5007 | struct netlink_ext_ack *extack) | |
1da177e4 | 5008 | { |
86872cb5 TG |
5009 | struct rtmsg *rtm; |
5010 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 5011 | unsigned int pref; |
86872cb5 | 5012 | int err; |
1da177e4 | 5013 | |
8cb08174 JB |
5014 | err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
5015 | rtm_ipv6_policy, extack); | |
86872cb5 TG |
5016 | if (err < 0) |
5017 | goto errout; | |
1da177e4 | 5018 | |
86872cb5 TG |
5019 | err = -EINVAL; |
5020 | rtm = nlmsg_data(nlh); | |
86872cb5 | 5021 | |
b9605161 GN |
5022 | if (rtm->rtm_tos) { |
5023 | NL_SET_ERR_MSG(extack, | |
5024 | "Invalid dsfield (tos): option not available for IPv6"); | |
5025 | goto errout; | |
5026 | } | |
5027 | ||
84db8407 MŻ |
5028 | *cfg = (struct fib6_config){ |
5029 | .fc_table = rtm->rtm_table, | |
5030 | .fc_dst_len = rtm->rtm_dst_len, | |
5031 | .fc_src_len = rtm->rtm_src_len, | |
5032 | .fc_flags = RTF_UP, | |
5033 | .fc_protocol = rtm->rtm_protocol, | |
5034 | .fc_type = rtm->rtm_type, | |
5035 | ||
5036 | .fc_nlinfo.portid = NETLINK_CB(skb).portid, | |
5037 | .fc_nlinfo.nlh = nlh, | |
5038 | .fc_nlinfo.nl_net = sock_net(skb->sk), | |
5039 | }; | |
86872cb5 | 5040 | |
ef2c7d7b ND |
5041 | if (rtm->rtm_type == RTN_UNREACHABLE || |
5042 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
5043 | rtm->rtm_type == RTN_PROHIBIT || |
5044 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
5045 | cfg->fc_flags |= RTF_REJECT; |
5046 | ||
ab79ad14 MŻ |
5047 | if (rtm->rtm_type == RTN_LOCAL) |
5048 | cfg->fc_flags |= RTF_LOCAL; | |
5049 | ||
1f56a01f MKL |
5050 | if (rtm->rtm_flags & RTM_F_CLONED) |
5051 | cfg->fc_flags |= RTF_CACHE; | |
5052 | ||
fc1e64e1 DA |
5053 | cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK); |
5054 | ||
5b98324e DA |
5055 | if (tb[RTA_NH_ID]) { |
5056 | if (tb[RTA_GATEWAY] || tb[RTA_OIF] || | |
5057 | tb[RTA_MULTIPATH] || tb[RTA_ENCAP]) { | |
5058 | NL_SET_ERR_MSG(extack, | |
5059 | "Nexthop specification and nexthop id are mutually exclusive"); | |
5060 | goto errout; | |
5061 | } | |
5062 | cfg->fc_nh_id = nla_get_u32(tb[RTA_NH_ID]); | |
5063 | } | |
5064 | ||
86872cb5 | 5065 | if (tb[RTA_GATEWAY]) { |
67b61f6c | 5066 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 5067 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 5068 | } |
e3818541 DA |
5069 | if (tb[RTA_VIA]) { |
5070 | NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute"); | |
5071 | goto errout; | |
5072 | } | |
86872cb5 TG |
5073 | |
5074 | if (tb[RTA_DST]) { | |
5075 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
5076 | ||
5077 | if (nla_len(tb[RTA_DST]) < plen) | |
5078 | goto errout; | |
5079 | ||
5080 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 5081 | } |
86872cb5 TG |
5082 | |
5083 | if (tb[RTA_SRC]) { | |
5084 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
5085 | ||
5086 | if (nla_len(tb[RTA_SRC]) < plen) | |
5087 | goto errout; | |
5088 | ||
5089 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 5090 | } |
86872cb5 | 5091 | |
c3968a85 | 5092 | if (tb[RTA_PREFSRC]) |
67b61f6c | 5093 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 5094 | |
86872cb5 TG |
5095 | if (tb[RTA_OIF]) |
5096 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
5097 | ||
5098 | if (tb[RTA_PRIORITY]) | |
5099 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
5100 | ||
5101 | if (tb[RTA_METRICS]) { | |
5102 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
5103 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 5104 | } |
86872cb5 TG |
5105 | |
5106 | if (tb[RTA_TABLE]) | |
5107 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
5108 | ||
51ebd318 ND |
5109 | if (tb[RTA_MULTIPATH]) { |
5110 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
5111 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
9ed59592 DA |
5112 | |
5113 | err = lwtunnel_valid_encap_type_attr(cfg->fc_mp, | |
c255bd68 | 5114 | cfg->fc_mp_len, extack); |
9ed59592 DA |
5115 | if (err < 0) |
5116 | goto errout; | |
51ebd318 ND |
5117 | } |
5118 | ||
c78ba6d6 LR |
5119 | if (tb[RTA_PREF]) { |
5120 | pref = nla_get_u8(tb[RTA_PREF]); | |
5121 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
5122 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
5123 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
5124 | cfg->fc_flags |= RTF_PREF(pref); | |
5125 | } | |
5126 | ||
19e42e45 RP |
5127 | if (tb[RTA_ENCAP]) |
5128 | cfg->fc_encap = tb[RTA_ENCAP]; | |
5129 | ||
9ed59592 | 5130 | if (tb[RTA_ENCAP_TYPE]) { |
19e42e45 RP |
5131 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); |
5132 | ||
c255bd68 | 5133 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack); |
9ed59592 DA |
5134 | if (err < 0) |
5135 | goto errout; | |
5136 | } | |
5137 | ||
32bc201e XL |
5138 | if (tb[RTA_EXPIRES]) { |
5139 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
5140 | ||
5141 | if (addrconf_finite_timeout(timeout)) { | |
5142 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
5143 | cfg->fc_flags |= RTF_EXPIRES; | |
5144 | } | |
5145 | } | |
5146 | ||
86872cb5 TG |
5147 | err = 0; |
5148 | errout: | |
5149 | return err; | |
1da177e4 LT |
5150 | } |
5151 | ||
6b9ea5a6 | 5152 | struct rt6_nh { |
8d1c802b | 5153 | struct fib6_info *fib6_info; |
6b9ea5a6 | 5154 | struct fib6_config r_cfg; |
6b9ea5a6 RP |
5155 | struct list_head next; |
5156 | }; | |
5157 | ||
d4ead6b3 DA |
5158 | static int ip6_route_info_append(struct net *net, |
5159 | struct list_head *rt6_nh_list, | |
8d1c802b DA |
5160 | struct fib6_info *rt, |
5161 | struct fib6_config *r_cfg) | |
6b9ea5a6 RP |
5162 | { |
5163 | struct rt6_nh *nh; | |
6b9ea5a6 RP |
5164 | int err = -EEXIST; |
5165 | ||
5166 | list_for_each_entry(nh, rt6_nh_list, next) { | |
8d1c802b DA |
5167 | /* check if fib6_info already exists */ |
5168 | if (rt6_duplicate_nexthop(nh->fib6_info, rt)) | |
6b9ea5a6 RP |
5169 | return err; |
5170 | } | |
5171 | ||
5172 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
5173 | if (!nh) | |
5174 | return -ENOMEM; | |
8d1c802b | 5175 | nh->fib6_info = rt; |
6b9ea5a6 RP |
5176 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); |
5177 | list_add_tail(&nh->next, rt6_nh_list); | |
5178 | ||
5179 | return 0; | |
5180 | } | |
5181 | ||
8d1c802b DA |
5182 | static void ip6_route_mpath_notify(struct fib6_info *rt, |
5183 | struct fib6_info *rt_last, | |
3b1137fe DA |
5184 | struct nl_info *info, |
5185 | __u16 nlflags) | |
5186 | { | |
5187 | /* if this is an APPEND route, then rt points to the first route | |
5188 | * inserted and rt_last points to last route inserted. Userspace | |
5189 | * wants a consistent dump of the route which starts at the first | |
5190 | * nexthop. Since sibling routes are always added at the end of | |
5191 | * the list, find the first sibling of the last route appended | |
5192 | */ | |
93c2fb25 DA |
5193 | if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) { |
5194 | rt = list_first_entry(&rt_last->fib6_siblings, | |
8d1c802b | 5195 | struct fib6_info, |
93c2fb25 | 5196 | fib6_siblings); |
3b1137fe DA |
5197 | } |
5198 | ||
5199 | if (rt) | |
5200 | inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags); | |
5201 | } | |
5202 | ||
0ee0f47c IS |
5203 | static bool ip6_route_mpath_should_notify(const struct fib6_info *rt) |
5204 | { | |
5205 | bool rt_can_ecmp = rt6_qualify_for_ecmp(rt); | |
5206 | bool should_notify = false; | |
5207 | struct fib6_info *leaf; | |
5208 | struct fib6_node *fn; | |
5209 | ||
5210 | rcu_read_lock(); | |
5211 | fn = rcu_dereference(rt->fib6_node); | |
5212 | if (!fn) | |
5213 | goto out; | |
5214 | ||
5215 | leaf = rcu_dereference(fn->leaf); | |
5216 | if (!leaf) | |
5217 | goto out; | |
5218 | ||
5219 | if (rt == leaf || | |
5220 | (rt_can_ecmp && rt->fib6_metric == leaf->fib6_metric && | |
5221 | rt6_qualify_for_ecmp(leaf))) | |
5222 | should_notify = true; | |
5223 | out: | |
5224 | rcu_read_unlock(); | |
5225 | ||
5226 | return should_notify; | |
5227 | } | |
5228 | ||
4619bcf9 DA |
5229 | static int fib6_gw_from_attr(struct in6_addr *gw, struct nlattr *nla, |
5230 | struct netlink_ext_ack *extack) | |
5231 | { | |
5232 | if (nla_len(nla) < sizeof(*gw)) { | |
5233 | NL_SET_ERR_MSG(extack, "Invalid IPv6 address in RTA_GATEWAY"); | |
5234 | return -EINVAL; | |
5235 | } | |
5236 | ||
5237 | *gw = nla_get_in6_addr(nla); | |
5238 | ||
5239 | return 0; | |
5240 | } | |
5241 | ||
333c4301 DA |
5242 | static int ip6_route_multipath_add(struct fib6_config *cfg, |
5243 | struct netlink_ext_ack *extack) | |
51ebd318 | 5244 | { |
8d1c802b | 5245 | struct fib6_info *rt_notif = NULL, *rt_last = NULL; |
3b1137fe | 5246 | struct nl_info *info = &cfg->fc_nlinfo; |
51ebd318 ND |
5247 | struct fib6_config r_cfg; |
5248 | struct rtnexthop *rtnh; | |
8d1c802b | 5249 | struct fib6_info *rt; |
6b9ea5a6 RP |
5250 | struct rt6_nh *err_nh; |
5251 | struct rt6_nh *nh, *nh_safe; | |
3b1137fe | 5252 | __u16 nlflags; |
51ebd318 ND |
5253 | int remaining; |
5254 | int attrlen; | |
6b9ea5a6 RP |
5255 | int err = 1; |
5256 | int nhn = 0; | |
5257 | int replace = (cfg->fc_nlinfo.nlh && | |
5258 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
5259 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 5260 | |
3b1137fe DA |
5261 | nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE; |
5262 | if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND) | |
5263 | nlflags |= NLM_F_APPEND; | |
5264 | ||
35f1b4e9 | 5265 | remaining = cfg->fc_mp_len; |
51ebd318 | 5266 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 5267 | |
6b9ea5a6 | 5268 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
8d1c802b | 5269 | * fib6_info structs per nexthop |
6b9ea5a6 | 5270 | */ |
51ebd318 ND |
5271 | while (rtnh_ok(rtnh, remaining)) { |
5272 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
5273 | if (rtnh->rtnh_ifindex) | |
5274 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
5275 | ||
5276 | attrlen = rtnh_attrlen(rtnh); | |
5277 | if (attrlen > 0) { | |
5278 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
5279 | ||
5280 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
5281 | if (nla) { | |
95bdba23 | 5282 | err = fib6_gw_from_attr(&r_cfg.fc_gateway, nla, |
4619bcf9 | 5283 | extack); |
95bdba23 DA |
5284 | if (err) |
5285 | goto cleanup; | |
4619bcf9 | 5286 | |
51ebd318 ND |
5287 | r_cfg.fc_flags |= RTF_GATEWAY; |
5288 | } | |
19e42e45 | 5289 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
8bda81a4 DA |
5290 | |
5291 | /* RTA_ENCAP_TYPE length checked in | |
5292 | * lwtunnel_valid_encap_type_attr | |
5293 | */ | |
19e42e45 RP |
5294 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); |
5295 | if (nla) | |
5296 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 5297 | } |
6b9ea5a6 | 5298 | |
68e2ffde | 5299 | r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK); |
acb54e3c | 5300 | rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack); |
8c5b83f0 RP |
5301 | if (IS_ERR(rt)) { |
5302 | err = PTR_ERR(rt); | |
5303 | rt = NULL; | |
6b9ea5a6 | 5304 | goto cleanup; |
8c5b83f0 | 5305 | } |
b5d2d75e DA |
5306 | if (!rt6_qualify_for_ecmp(rt)) { |
5307 | err = -EINVAL; | |
5308 | NL_SET_ERR_MSG(extack, | |
5309 | "Device only routes can not be added for IPv6 using the multipath API."); | |
5310 | fib6_info_release(rt); | |
5311 | goto cleanup; | |
5312 | } | |
6b9ea5a6 | 5313 | |
1cf844c7 | 5314 | rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1; |
398958ae | 5315 | |
d4ead6b3 DA |
5316 | err = ip6_route_info_append(info->nl_net, &rt6_nh_list, |
5317 | rt, &r_cfg); | |
51ebd318 | 5318 | if (err) { |
93531c67 | 5319 | fib6_info_release(rt); |
6b9ea5a6 RP |
5320 | goto cleanup; |
5321 | } | |
5322 | ||
5323 | rtnh = rtnh_next(rtnh, &remaining); | |
5324 | } | |
5325 | ||
9eee3b49 IS |
5326 | if (list_empty(&rt6_nh_list)) { |
5327 | NL_SET_ERR_MSG(extack, | |
5328 | "Invalid nexthop configuration - no valid nexthops"); | |
5329 | return -EINVAL; | |
5330 | } | |
5331 | ||
3b1137fe DA |
5332 | /* for add and replace send one notification with all nexthops. |
5333 | * Skip the notification in fib6_add_rt2node and send one with | |
5334 | * the full route when done | |
5335 | */ | |
5336 | info->skip_notify = 1; | |
5337 | ||
ebee3cad IS |
5338 | /* For add and replace, send one notification with all nexthops. For |
5339 | * append, send one notification with all appended nexthops. | |
5340 | */ | |
5341 | info->skip_notify_kernel = 1; | |
5342 | ||
6b9ea5a6 RP |
5343 | err_nh = NULL; |
5344 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
8d1c802b | 5345 | err = __ip6_ins_rt(nh->fib6_info, info, extack); |
3b1137fe | 5346 | |
6b9ea5a6 RP |
5347 | if (err) { |
5348 | if (replace && nhn) | |
a5a82d84 JK |
5349 | NL_SET_ERR_MSG_MOD(extack, |
5350 | "multipath route replace failed (check consistency of installed routes)"); | |
6b9ea5a6 RP |
5351 | err_nh = nh; |
5352 | goto add_errout; | |
51ebd318 | 5353 | } |
685f7d53 ED |
5354 | /* save reference to last route successfully inserted */ |
5355 | rt_last = nh->fib6_info; | |
5356 | ||
5357 | /* save reference to first route for notification */ | |
5358 | if (!rt_notif) | |
5359 | rt_notif = nh->fib6_info; | |
6b9ea5a6 | 5360 | |
1a72418b | 5361 | /* Because each route is added like a single route we remove |
27596472 MK |
5362 | * these flags after the first nexthop: if there is a collision, |
5363 | * we have already failed to add the first nexthop: | |
5364 | * fib6_add_rt2node() has rejected it; when replacing, old | |
5365 | * nexthops have been replaced by first new, the rest should | |
5366 | * be added to it. | |
1a72418b | 5367 | */ |
864db232 MUA |
5368 | if (cfg->fc_nlinfo.nlh) { |
5369 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | | |
5370 | NLM_F_REPLACE); | |
5371 | cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE; | |
5372 | } | |
6b9ea5a6 RP |
5373 | nhn++; |
5374 | } | |
5375 | ||
0ee0f47c IS |
5376 | /* An in-kernel notification should only be sent in case the new |
5377 | * multipath route is added as the first route in the node, or if | |
5378 | * it was appended to it. We pass 'rt_notif' since it is the first | |
5379 | * sibling and might allow us to skip some checks in the replace case. | |
5380 | */ | |
5381 | if (ip6_route_mpath_should_notify(rt_notif)) { | |
5382 | enum fib_event_type fib_event; | |
5383 | ||
5384 | if (rt_notif->fib6_nsiblings != nhn - 1) | |
5385 | fib_event = FIB_EVENT_ENTRY_APPEND; | |
5386 | else | |
caafb250 | 5387 | fib_event = FIB_EVENT_ENTRY_REPLACE; |
0ee0f47c IS |
5388 | |
5389 | err = call_fib6_multipath_entry_notifiers(info->nl_net, | |
5390 | fib_event, rt_notif, | |
5391 | nhn - 1, extack); | |
5392 | if (err) { | |
5393 | /* Delete all the siblings that were just added */ | |
5394 | err_nh = NULL; | |
5395 | goto add_errout; | |
5396 | } | |
5397 | } | |
ebee3cad | 5398 | |
3b1137fe DA |
5399 | /* success ... tell user about new route */ |
5400 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
6b9ea5a6 RP |
5401 | goto cleanup; |
5402 | ||
5403 | add_errout: | |
3b1137fe DA |
5404 | /* send notification for routes that were added so that |
5405 | * the delete notifications sent by ip6_route_del are | |
5406 | * coherent | |
5407 | */ | |
5408 | if (rt_notif) | |
5409 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
5410 | ||
6b9ea5a6 RP |
5411 | /* Delete routes that were already added */ |
5412 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
5413 | if (err_nh == nh) | |
5414 | break; | |
333c4301 | 5415 | ip6_route_del(&nh->r_cfg, extack); |
6b9ea5a6 RP |
5416 | } |
5417 | ||
5418 | cleanup: | |
5419 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
685f7d53 | 5420 | fib6_info_release(nh->fib6_info); |
6b9ea5a6 RP |
5421 | list_del(&nh->next); |
5422 | kfree(nh); | |
5423 | } | |
5424 | ||
5425 | return err; | |
5426 | } | |
5427 | ||
333c4301 DA |
5428 | static int ip6_route_multipath_del(struct fib6_config *cfg, |
5429 | struct netlink_ext_ack *extack) | |
6b9ea5a6 RP |
5430 | { |
5431 | struct fib6_config r_cfg; | |
5432 | struct rtnexthop *rtnh; | |
2291267e | 5433 | int last_err = 0; |
6b9ea5a6 RP |
5434 | int remaining; |
5435 | int attrlen; | |
2291267e | 5436 | int err; |
6b9ea5a6 RP |
5437 | |
5438 | remaining = cfg->fc_mp_len; | |
5439 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
5440 | ||
5441 | /* Parse a Multipath Entry */ | |
5442 | while (rtnh_ok(rtnh, remaining)) { | |
5443 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
5444 | if (rtnh->rtnh_ifindex) | |
5445 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
5446 | ||
5447 | attrlen = rtnh_attrlen(rtnh); | |
5448 | if (attrlen > 0) { | |
5449 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
5450 | ||
5451 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
5452 | if (nla) { | |
1ff15a71 DA |
5453 | err = fib6_gw_from_attr(&r_cfg.fc_gateway, nla, |
5454 | extack); | |
e30a845b DA |
5455 | if (err) { |
5456 | last_err = err; | |
5457 | goto next_rtnh; | |
5458 | } | |
1ff15a71 | 5459 | |
6b9ea5a6 RP |
5460 | r_cfg.fc_flags |= RTF_GATEWAY; |
5461 | } | |
5462 | } | |
333c4301 | 5463 | err = ip6_route_del(&r_cfg, extack); |
6b9ea5a6 RP |
5464 | if (err) |
5465 | last_err = err; | |
5466 | ||
e30a845b | 5467 | next_rtnh: |
51ebd318 ND |
5468 | rtnh = rtnh_next(rtnh, &remaining); |
5469 | } | |
5470 | ||
5471 | return last_err; | |
5472 | } | |
5473 | ||
c21ef3e3 DA |
5474 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
5475 | struct netlink_ext_ack *extack) | |
1da177e4 | 5476 | { |
86872cb5 TG |
5477 | struct fib6_config cfg; |
5478 | int err; | |
1da177e4 | 5479 | |
333c4301 | 5480 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
5481 | if (err < 0) |
5482 | return err; | |
5483 | ||
5b98324e DA |
5484 | if (cfg.fc_nh_id && |
5485 | !nexthop_find_by_id(sock_net(skb->sk), cfg.fc_nh_id)) { | |
5486 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
5487 | return -EINVAL; | |
5488 | } | |
5489 | ||
51ebd318 | 5490 | if (cfg.fc_mp) |
333c4301 | 5491 | return ip6_route_multipath_del(&cfg, extack); |
0ae81335 DA |
5492 | else { |
5493 | cfg.fc_delete_all_nh = 1; | |
333c4301 | 5494 | return ip6_route_del(&cfg, extack); |
0ae81335 | 5495 | } |
1da177e4 LT |
5496 | } |
5497 | ||
c21ef3e3 DA |
5498 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
5499 | struct netlink_ext_ack *extack) | |
1da177e4 | 5500 | { |
86872cb5 TG |
5501 | struct fib6_config cfg; |
5502 | int err; | |
1da177e4 | 5503 | |
333c4301 | 5504 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
5505 | if (err < 0) |
5506 | return err; | |
5507 | ||
67f69513 DA |
5508 | if (cfg.fc_metric == 0) |
5509 | cfg.fc_metric = IP6_RT_PRIO_USER; | |
5510 | ||
51ebd318 | 5511 | if (cfg.fc_mp) |
333c4301 | 5512 | return ip6_route_multipath_add(&cfg, extack); |
51ebd318 | 5513 | else |
acb54e3c | 5514 | return ip6_route_add(&cfg, GFP_KERNEL, extack); |
1da177e4 LT |
5515 | } |
5516 | ||
a1b7a1f0 DA |
5517 | /* add the overhead of this fib6_nh to nexthop_len */ |
5518 | static int rt6_nh_nlmsg_size(struct fib6_nh *nh, void *arg) | |
339bf98f | 5519 | { |
a1b7a1f0 | 5520 | int *nexthop_len = arg; |
beb1afac | 5521 | |
a1b7a1f0 DA |
5522 | *nexthop_len += nla_total_size(0) /* RTA_MULTIPATH */ |
5523 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
5524 | + nla_total_size(16); /* RTA_GATEWAY */ | |
5525 | ||
5526 | if (nh->fib_nh_lws) { | |
5527 | /* RTA_ENCAP_TYPE */ | |
5528 | *nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws); | |
5529 | /* RTA_ENCAP */ | |
5530 | *nexthop_len += nla_total_size(2); | |
5531 | } | |
f88d8ea6 | 5532 | |
a1b7a1f0 DA |
5533 | return 0; |
5534 | } | |
beb1afac | 5535 | |
a1b7a1f0 DA |
5536 | static size_t rt6_nlmsg_size(struct fib6_info *f6i) |
5537 | { | |
5538 | int nexthop_len; | |
5539 | ||
5540 | if (f6i->nh) { | |
5541 | nexthop_len = nla_total_size(4); /* RTA_NH_ID */ | |
5542 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_nlmsg_size, | |
5543 | &nexthop_len); | |
5544 | } else { | |
4cc59f38 | 5545 | struct fib6_info *sibling, *next_sibling; |
a1b7a1f0 DA |
5546 | struct fib6_nh *nh = f6i->fib6_nh; |
5547 | ||
5548 | nexthop_len = 0; | |
5549 | if (f6i->fib6_nsiblings) { | |
4cc59f38 | 5550 | rt6_nh_nlmsg_size(nh, &nexthop_len); |
a1b7a1f0 | 5551 | |
4cc59f38 LW |
5552 | list_for_each_entry_safe(sibling, next_sibling, |
5553 | &f6i->fib6_siblings, fib6_siblings) { | |
5554 | rt6_nh_nlmsg_size(sibling->fib6_nh, &nexthop_len); | |
5555 | } | |
a1b7a1f0 DA |
5556 | } |
5557 | nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws); | |
beb1afac DA |
5558 | } |
5559 | ||
339bf98f TG |
5560 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
5561 | + nla_total_size(16) /* RTA_SRC */ | |
5562 | + nla_total_size(16) /* RTA_DST */ | |
5563 | + nla_total_size(16) /* RTA_GATEWAY */ | |
5564 | + nla_total_size(16) /* RTA_PREFSRC */ | |
5565 | + nla_total_size(4) /* RTA_TABLE */ | |
5566 | + nla_total_size(4) /* RTA_IIF */ | |
5567 | + nla_total_size(4) /* RTA_OIF */ | |
5568 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 5569 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 5570 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 5571 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 5572 | + nla_total_size(1) /* RTA_PREF */ |
beb1afac DA |
5573 | + nexthop_len; |
5574 | } | |
5575 | ||
f88d8ea6 DA |
5576 | static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh, |
5577 | unsigned char *flags) | |
5578 | { | |
5579 | if (nexthop_is_multipath(nh)) { | |
5580 | struct nlattr *mp; | |
5581 | ||
4255ff05 | 5582 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
f88d8ea6 DA |
5583 | if (!mp) |
5584 | goto nla_put_failure; | |
5585 | ||
7bdf4de1 | 5586 | if (nexthop_mpath_fill_node(skb, nh, AF_INET6)) |
f88d8ea6 DA |
5587 | goto nla_put_failure; |
5588 | ||
5589 | nla_nest_end(skb, mp); | |
5590 | } else { | |
5591 | struct fib6_nh *fib6_nh; | |
5592 | ||
5593 | fib6_nh = nexthop_fib6_nh(nh); | |
7bdf4de1 | 5594 | if (fib_nexthop_info(skb, &fib6_nh->nh_common, AF_INET6, |
f88d8ea6 DA |
5595 | flags, false) < 0) |
5596 | goto nla_put_failure; | |
5597 | } | |
5598 | ||
5599 | return 0; | |
5600 | ||
5601 | nla_put_failure: | |
5602 | return -EMSGSIZE; | |
5603 | } | |
5604 | ||
d4ead6b3 | 5605 | static int rt6_fill_node(struct net *net, struct sk_buff *skb, |
8d1c802b | 5606 | struct fib6_info *rt, struct dst_entry *dst, |
d4ead6b3 | 5607 | struct in6_addr *dest, struct in6_addr *src, |
15e47304 | 5608 | int iif, int type, u32 portid, u32 seq, |
f8cfe2ce | 5609 | unsigned int flags) |
1da177e4 | 5610 | { |
e8dfd42c | 5611 | struct rt6_info *rt6 = dst_rt6_info(dst); |
22d0bd82 XL |
5612 | struct rt6key *rt6_dst, *rt6_src; |
5613 | u32 *pmetrics, table, rt6_flags; | |
f88d8ea6 | 5614 | unsigned char nh_flags = 0; |
2d7202bf | 5615 | struct nlmsghdr *nlh; |
22d0bd82 | 5616 | struct rtmsg *rtm; |
d4ead6b3 | 5617 | long expires = 0; |
1da177e4 | 5618 | |
15e47304 | 5619 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 5620 | if (!nlh) |
26932566 | 5621 | return -EMSGSIZE; |
2d7202bf | 5622 | |
22d0bd82 XL |
5623 | if (rt6) { |
5624 | rt6_dst = &rt6->rt6i_dst; | |
5625 | rt6_src = &rt6->rt6i_src; | |
5626 | rt6_flags = rt6->rt6i_flags; | |
5627 | } else { | |
5628 | rt6_dst = &rt->fib6_dst; | |
5629 | rt6_src = &rt->fib6_src; | |
5630 | rt6_flags = rt->fib6_flags; | |
5631 | } | |
5632 | ||
2d7202bf | 5633 | rtm = nlmsg_data(nlh); |
1da177e4 | 5634 | rtm->rtm_family = AF_INET6; |
22d0bd82 XL |
5635 | rtm->rtm_dst_len = rt6_dst->plen; |
5636 | rtm->rtm_src_len = rt6_src->plen; | |
1da177e4 | 5637 | rtm->rtm_tos = 0; |
93c2fb25 DA |
5638 | if (rt->fib6_table) |
5639 | table = rt->fib6_table->tb6_id; | |
c71099ac | 5640 | else |
9e762a4a | 5641 | table = RT6_TABLE_UNSPEC; |
97f0082a | 5642 | rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT; |
c78679e8 DM |
5643 | if (nla_put_u32(skb, RTA_TABLE, table)) |
5644 | goto nla_put_failure; | |
e8478e80 DA |
5645 | |
5646 | rtm->rtm_type = rt->fib6_type; | |
1da177e4 LT |
5647 | rtm->rtm_flags = 0; |
5648 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
93c2fb25 | 5649 | rtm->rtm_protocol = rt->fib6_protocol; |
1da177e4 | 5650 | |
22d0bd82 | 5651 | if (rt6_flags & RTF_CACHE) |
1da177e4 LT |
5652 | rtm->rtm_flags |= RTM_F_CLONED; |
5653 | ||
d4ead6b3 DA |
5654 | if (dest) { |
5655 | if (nla_put_in6_addr(skb, RTA_DST, dest)) | |
c78679e8 | 5656 | goto nla_put_failure; |
1ab1457c | 5657 | rtm->rtm_dst_len = 128; |
1da177e4 | 5658 | } else if (rtm->rtm_dst_len) |
22d0bd82 | 5659 | if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr)) |
c78679e8 | 5660 | goto nla_put_failure; |
1da177e4 LT |
5661 | #ifdef CONFIG_IPV6_SUBTREES |
5662 | if (src) { | |
930345ea | 5663 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 5664 | goto nla_put_failure; |
1ab1457c | 5665 | rtm->rtm_src_len = 128; |
c78679e8 | 5666 | } else if (rtm->rtm_src_len && |
22d0bd82 | 5667 | nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr)) |
c78679e8 | 5668 | goto nla_put_failure; |
1da177e4 | 5669 | #endif |
7bc570c8 YH |
5670 | if (iif) { |
5671 | #ifdef CONFIG_IPV6_MROUTE | |
22d0bd82 | 5672 | if (ipv6_addr_is_multicast(&rt6_dst->addr)) { |
fd61c6ba DA |
5673 | int err = ip6mr_get_route(net, skb, rtm, portid); |
5674 | ||
5675 | if (err == 0) | |
5676 | return 0; | |
5677 | if (err < 0) | |
5678 | goto nla_put_failure; | |
7bc570c8 YH |
5679 | } else |
5680 | #endif | |
c78679e8 DM |
5681 | if (nla_put_u32(skb, RTA_IIF, iif)) |
5682 | goto nla_put_failure; | |
d4ead6b3 | 5683 | } else if (dest) { |
1da177e4 | 5684 | struct in6_addr saddr_buf; |
d4ead6b3 | 5685 | if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 && |
930345ea | 5686 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 5687 | goto nla_put_failure; |
1da177e4 | 5688 | } |
2d7202bf | 5689 | |
93c2fb25 | 5690 | if (rt->fib6_prefsrc.plen) { |
c3968a85 | 5691 | struct in6_addr saddr_buf; |
93c2fb25 | 5692 | saddr_buf = rt->fib6_prefsrc.addr; |
930345ea | 5693 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 5694 | goto nla_put_failure; |
c3968a85 DW |
5695 | } |
5696 | ||
d4ead6b3 DA |
5697 | pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics; |
5698 | if (rtnetlink_put_metrics(skb, pmetrics) < 0) | |
2d7202bf TG |
5699 | goto nla_put_failure; |
5700 | ||
93c2fb25 | 5701 | if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric)) |
c78679e8 | 5702 | goto nla_put_failure; |
8253947e | 5703 | |
beb1afac DA |
5704 | /* For multipath routes, walk the siblings list and add |
5705 | * each as a nexthop within RTA_MULTIPATH. | |
5706 | */ | |
22d0bd82 XL |
5707 | if (rt6) { |
5708 | if (rt6_flags & RTF_GATEWAY && | |
5709 | nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway)) | |
5710 | goto nla_put_failure; | |
5711 | ||
5712 | if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex)) | |
5713 | goto nla_put_failure; | |
6b13d8f7 OH |
5714 | |
5715 | if (dst->lwtstate && | |
5716 | lwtunnel_fill_encap(skb, dst->lwtstate, RTA_ENCAP, RTA_ENCAP_TYPE) < 0) | |
5717 | goto nla_put_failure; | |
22d0bd82 | 5718 | } else if (rt->fib6_nsiblings) { |
8d1c802b | 5719 | struct fib6_info *sibling, *next_sibling; |
beb1afac DA |
5720 | struct nlattr *mp; |
5721 | ||
ae0be8de | 5722 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
beb1afac DA |
5723 | if (!mp) |
5724 | goto nla_put_failure; | |
5725 | ||
1cf844c7 | 5726 | if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common, |
597aa16c XL |
5727 | rt->fib6_nh->fib_nh_weight, AF_INET6, |
5728 | 0) < 0) | |
beb1afac DA |
5729 | goto nla_put_failure; |
5730 | ||
5731 | list_for_each_entry_safe(sibling, next_sibling, | |
93c2fb25 | 5732 | &rt->fib6_siblings, fib6_siblings) { |
1cf844c7 | 5733 | if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common, |
7bdf4de1 | 5734 | sibling->fib6_nh->fib_nh_weight, |
597aa16c | 5735 | AF_INET6, 0) < 0) |
beb1afac DA |
5736 | goto nla_put_failure; |
5737 | } | |
5738 | ||
5739 | nla_nest_end(skb, mp); | |
f88d8ea6 DA |
5740 | } else if (rt->nh) { |
5741 | if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id)) | |
5742 | goto nla_put_failure; | |
ecc5663c | 5743 | |
f88d8ea6 DA |
5744 | if (nexthop_is_blackhole(rt->nh)) |
5745 | rtm->rtm_type = RTN_BLACKHOLE; | |
5746 | ||
bdf00bf2 | 5747 | if (READ_ONCE(net->ipv4.sysctl_nexthop_compat_mode) && |
4f80116d | 5748 | rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0) |
f88d8ea6 DA |
5749 | goto nla_put_failure; |
5750 | ||
5751 | rtm->rtm_flags |= nh_flags; | |
5752 | } else { | |
7bdf4de1 | 5753 | if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, AF_INET6, |
ecc5663c | 5754 | &nh_flags, false) < 0) |
beb1afac | 5755 | goto nla_put_failure; |
ecc5663c DA |
5756 | |
5757 | rtm->rtm_flags |= nh_flags; | |
beb1afac DA |
5758 | } |
5759 | ||
22d0bd82 | 5760 | if (rt6_flags & RTF_EXPIRES) { |
14895687 DA |
5761 | expires = dst ? dst->expires : rt->expires; |
5762 | expires -= jiffies; | |
5763 | } | |
69cdf8f9 | 5764 | |
bb3c4ab9 | 5765 | if (!dst) { |
d95d6320 | 5766 | if (READ_ONCE(rt->offload)) |
bb3c4ab9 | 5767 | rtm->rtm_flags |= RTM_F_OFFLOAD; |
d95d6320 | 5768 | if (READ_ONCE(rt->trap)) |
bb3c4ab9 | 5769 | rtm->rtm_flags |= RTM_F_TRAP; |
d95d6320 | 5770 | if (READ_ONCE(rt->offload_failed)) |
0c5fcf9e | 5771 | rtm->rtm_flags |= RTM_F_OFFLOAD_FAILED; |
bb3c4ab9 IS |
5772 | } |
5773 | ||
d4ead6b3 | 5774 | if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0) |
e3703b3d | 5775 | goto nla_put_failure; |
2d7202bf | 5776 | |
22d0bd82 | 5777 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags))) |
c78ba6d6 LR |
5778 | goto nla_put_failure; |
5779 | ||
19e42e45 | 5780 | |
053c095a JB |
5781 | nlmsg_end(skb, nlh); |
5782 | return 0; | |
2d7202bf TG |
5783 | |
5784 | nla_put_failure: | |
26932566 PM |
5785 | nlmsg_cancel(skb, nlh); |
5786 | return -EMSGSIZE; | |
1da177e4 LT |
5787 | } |
5788 | ||
2c170e07 DA |
5789 | static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg) |
5790 | { | |
5791 | const struct net_device *dev = arg; | |
5792 | ||
5793 | if (nh->fib_nh_dev == dev) | |
5794 | return 1; | |
5795 | ||
5796 | return 0; | |
5797 | } | |
5798 | ||
13e38901 DA |
5799 | static bool fib6_info_uses_dev(const struct fib6_info *f6i, |
5800 | const struct net_device *dev) | |
5801 | { | |
2c170e07 DA |
5802 | if (f6i->nh) { |
5803 | struct net_device *_dev = (struct net_device *)dev; | |
5804 | ||
5805 | return !!nexthop_for_each_fib6_nh(f6i->nh, | |
5806 | fib6_info_nh_uses_dev, | |
5807 | _dev); | |
5808 | } | |
5809 | ||
1cf844c7 | 5810 | if (f6i->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5811 | return true; |
5812 | ||
5813 | if (f6i->fib6_nsiblings) { | |
5814 | struct fib6_info *sibling, *next_sibling; | |
5815 | ||
5816 | list_for_each_entry_safe(sibling, next_sibling, | |
5817 | &f6i->fib6_siblings, fib6_siblings) { | |
1cf844c7 | 5818 | if (sibling->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5819 | return true; |
5820 | } | |
5821 | } | |
5822 | ||
5823 | return false; | |
5824 | } | |
5825 | ||
1e47b483 SB |
5826 | struct fib6_nh_exception_dump_walker { |
5827 | struct rt6_rtnl_dump_arg *dump; | |
5828 | struct fib6_info *rt; | |
5829 | unsigned int flags; | |
5830 | unsigned int skip; | |
5831 | unsigned int count; | |
5832 | }; | |
5833 | ||
5834 | static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg) | |
5835 | { | |
5836 | struct fib6_nh_exception_dump_walker *w = arg; | |
5837 | struct rt6_rtnl_dump_arg *dump = w->dump; | |
5838 | struct rt6_exception_bucket *bucket; | |
5839 | struct rt6_exception *rt6_ex; | |
5840 | int i, err; | |
5841 | ||
5842 | bucket = fib6_nh_get_excptn_bucket(nh, NULL); | |
5843 | if (!bucket) | |
5844 | return 0; | |
5845 | ||
5846 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
5847 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
5848 | if (w->skip) { | |
5849 | w->skip--; | |
5850 | continue; | |
5851 | } | |
5852 | ||
5853 | /* Expiration of entries doesn't bump sernum, insertion | |
5854 | * does. Removal is triggered by insertion, so we can | |
5855 | * rely on the fact that if entries change between two | |
5856 | * partial dumps, this node is scanned again completely, | |
5857 | * see rt6_insert_exception() and fib6_dump_table(). | |
5858 | * | |
5859 | * Count expired entries we go through as handled | |
5860 | * entries that we'll skip next time, in case of partial | |
5861 | * node dump. Otherwise, if entries expire meanwhile, | |
5862 | * we'll skip the wrong amount. | |
5863 | */ | |
5864 | if (rt6_check_expired(rt6_ex->rt6i)) { | |
5865 | w->count++; | |
5866 | continue; | |
5867 | } | |
5868 | ||
5869 | err = rt6_fill_node(dump->net, dump->skb, w->rt, | |
5870 | &rt6_ex->rt6i->dst, NULL, NULL, 0, | |
5871 | RTM_NEWROUTE, | |
5872 | NETLINK_CB(dump->cb->skb).portid, | |
5873 | dump->cb->nlh->nlmsg_seq, w->flags); | |
5874 | if (err) | |
5875 | return err; | |
5876 | ||
5877 | w->count++; | |
5878 | } | |
5879 | bucket++; | |
5880 | } | |
5881 | ||
5882 | return 0; | |
5883 | } | |
5884 | ||
bf9a8a06 | 5885 | /* Return -1 if done with node, number of handled routes on partial dump */ |
1e47b483 | 5886 | int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip) |
1da177e4 LT |
5887 | { |
5888 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
13e38901 DA |
5889 | struct fib_dump_filter *filter = &arg->filter; |
5890 | unsigned int flags = NLM_F_MULTI; | |
1f17e2f2 | 5891 | struct net *net = arg->net; |
1e47b483 | 5892 | int count = 0; |
1f17e2f2 | 5893 | |
421842ed | 5894 | if (rt == net->ipv6.fib6_null_entry) |
bf9a8a06 | 5895 | return -1; |
1da177e4 | 5896 | |
13e38901 DA |
5897 | if ((filter->flags & RTM_F_PREFIX) && |
5898 | !(rt->fib6_flags & RTF_PREFIX_RT)) { | |
5899 | /* success since this is not a prefix route */ | |
bf9a8a06 | 5900 | return -1; |
13e38901 | 5901 | } |
1e47b483 SB |
5902 | if (filter->filter_set && |
5903 | ((filter->rt_type && rt->fib6_type != filter->rt_type) || | |
5904 | (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) || | |
5905 | (filter->protocol && rt->fib6_protocol != filter->protocol))) { | |
5906 | return -1; | |
5907 | } | |
5908 | ||
5909 | if (filter->filter_set || | |
5910 | !filter->dump_routes || !filter->dump_exceptions) { | |
13e38901 | 5911 | flags |= NLM_F_DUMP_FILTERED; |
f8cfe2ce | 5912 | } |
1da177e4 | 5913 | |
1e47b483 SB |
5914 | if (filter->dump_routes) { |
5915 | if (skip) { | |
5916 | skip--; | |
5917 | } else { | |
5918 | if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL, | |
5919 | 0, RTM_NEWROUTE, | |
5920 | NETLINK_CB(arg->cb->skb).portid, | |
5921 | arg->cb->nlh->nlmsg_seq, flags)) { | |
5922 | return 0; | |
5923 | } | |
5924 | count++; | |
5925 | } | |
5926 | } | |
5927 | ||
5928 | if (filter->dump_exceptions) { | |
5929 | struct fib6_nh_exception_dump_walker w = { .dump = arg, | |
5930 | .rt = rt, | |
5931 | .flags = flags, | |
5932 | .skip = skip, | |
5933 | .count = 0 }; | |
5934 | int err; | |
5935 | ||
3b525691 | 5936 | rcu_read_lock(); |
1e47b483 SB |
5937 | if (rt->nh) { |
5938 | err = nexthop_for_each_fib6_nh(rt->nh, | |
5939 | rt6_nh_dump_exceptions, | |
5940 | &w); | |
5941 | } else { | |
5942 | err = rt6_nh_dump_exceptions(rt->fib6_nh, &w); | |
5943 | } | |
3b525691 | 5944 | rcu_read_unlock(); |
1e47b483 SB |
5945 | |
5946 | if (err) | |
74fd304f | 5947 | return count + w.count; |
1e47b483 | 5948 | } |
bf9a8a06 SB |
5949 | |
5950 | return -1; | |
1da177e4 LT |
5951 | } |
5952 | ||
0eff0a27 JK |
5953 | static int inet6_rtm_valid_getroute_req(struct sk_buff *skb, |
5954 | const struct nlmsghdr *nlh, | |
5955 | struct nlattr **tb, | |
5956 | struct netlink_ext_ack *extack) | |
5957 | { | |
5958 | struct rtmsg *rtm; | |
5959 | int i, err; | |
5960 | ||
5961 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
5962 | NL_SET_ERR_MSG_MOD(extack, | |
5963 | "Invalid header for get route request"); | |
5964 | return -EINVAL; | |
5965 | } | |
5966 | ||
5967 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
5968 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
5969 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5970 | |
5971 | rtm = nlmsg_data(nlh); | |
5972 | if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) || | |
5973 | (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) || | |
5974 | rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope || | |
5975 | rtm->rtm_type) { | |
5976 | NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); | |
5977 | return -EINVAL; | |
5978 | } | |
5979 | if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { | |
5980 | NL_SET_ERR_MSG_MOD(extack, | |
5981 | "Invalid flags for get route request"); | |
5982 | return -EINVAL; | |
5983 | } | |
5984 | ||
8cb08174 JB |
5985 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
5986 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5987 | if (err) |
5988 | return err; | |
5989 | ||
5990 | if ((tb[RTA_SRC] && !rtm->rtm_src_len) || | |
5991 | (tb[RTA_DST] && !rtm->rtm_dst_len)) { | |
5992 | NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6"); | |
5993 | return -EINVAL; | |
5994 | } | |
5995 | ||
5996 | for (i = 0; i <= RTA_MAX; i++) { | |
5997 | if (!tb[i]) | |
5998 | continue; | |
5999 | ||
6000 | switch (i) { | |
6001 | case RTA_SRC: | |
6002 | case RTA_DST: | |
6003 | case RTA_IIF: | |
6004 | case RTA_OIF: | |
6005 | case RTA_MARK: | |
6006 | case RTA_UID: | |
6007 | case RTA_SPORT: | |
6008 | case RTA_DPORT: | |
6009 | case RTA_IP_PROTO: | |
6010 | break; | |
6011 | default: | |
6012 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); | |
6013 | return -EINVAL; | |
6014 | } | |
6015 | } | |
6016 | ||
6017 | return 0; | |
6018 | } | |
6019 | ||
c21ef3e3 DA |
6020 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
6021 | struct netlink_ext_ack *extack) | |
1da177e4 | 6022 | { |
3b1e0a65 | 6023 | struct net *net = sock_net(in_skb->sk); |
ab364a6f | 6024 | struct nlattr *tb[RTA_MAX+1]; |
18c3a61c | 6025 | int err, iif = 0, oif = 0; |
a68886a6 | 6026 | struct fib6_info *from; |
18c3a61c | 6027 | struct dst_entry *dst; |
ab364a6f | 6028 | struct rt6_info *rt; |
1da177e4 | 6029 | struct sk_buff *skb; |
ab364a6f | 6030 | struct rtmsg *rtm; |
744486d4 | 6031 | struct flowi6 fl6 = {}; |
18c3a61c | 6032 | bool fibmatch; |
1da177e4 | 6033 | |
0eff0a27 | 6034 | err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack); |
ab364a6f TG |
6035 | if (err < 0) |
6036 | goto errout; | |
1da177e4 | 6037 | |
ab364a6f | 6038 | err = -EINVAL; |
38b7097b HFS |
6039 | rtm = nlmsg_data(nlh); |
6040 | fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0); | |
18c3a61c | 6041 | fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH); |
1da177e4 | 6042 | |
ab364a6f TG |
6043 | if (tb[RTA_SRC]) { |
6044 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
6045 | goto errout; | |
6046 | ||
4e3fd7a0 | 6047 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
6048 | } |
6049 | ||
6050 | if (tb[RTA_DST]) { | |
6051 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
6052 | goto errout; | |
6053 | ||
4e3fd7a0 | 6054 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
6055 | } |
6056 | ||
6057 | if (tb[RTA_IIF]) | |
6058 | iif = nla_get_u32(tb[RTA_IIF]); | |
6059 | ||
6060 | if (tb[RTA_OIF]) | |
72331bc0 | 6061 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 6062 | |
2e47b291 LC |
6063 | if (tb[RTA_MARK]) |
6064 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
6065 | ||
622ec2c9 LC |
6066 | if (tb[RTA_UID]) |
6067 | fl6.flowi6_uid = make_kuid(current_user_ns(), | |
6068 | nla_get_u32(tb[RTA_UID])); | |
6069 | else | |
6070 | fl6.flowi6_uid = iif ? INVALID_UID : current_uid(); | |
6071 | ||
eacb9384 RP |
6072 | if (tb[RTA_SPORT]) |
6073 | fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]); | |
6074 | ||
6075 | if (tb[RTA_DPORT]) | |
6076 | fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]); | |
6077 | ||
6078 | if (tb[RTA_IP_PROTO]) { | |
6079 | err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO], | |
5e1a99ea HL |
6080 | &fl6.flowi6_proto, AF_INET6, |
6081 | extack); | |
eacb9384 RP |
6082 | if (err) |
6083 | goto errout; | |
6084 | } | |
6085 | ||
1da177e4 LT |
6086 | if (iif) { |
6087 | struct net_device *dev; | |
72331bc0 SL |
6088 | int flags = 0; |
6089 | ||
121622db FW |
6090 | rcu_read_lock(); |
6091 | ||
6092 | dev = dev_get_by_index_rcu(net, iif); | |
1da177e4 | 6093 | if (!dev) { |
121622db | 6094 | rcu_read_unlock(); |
1da177e4 | 6095 | err = -ENODEV; |
ab364a6f | 6096 | goto errout; |
1da177e4 | 6097 | } |
72331bc0 SL |
6098 | |
6099 | fl6.flowi6_iif = iif; | |
6100 | ||
6101 | if (!ipv6_addr_any(&fl6.saddr)) | |
6102 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
6103 | ||
b75cc8f9 | 6104 | dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags); |
121622db FW |
6105 | |
6106 | rcu_read_unlock(); | |
72331bc0 SL |
6107 | } else { |
6108 | fl6.flowi6_oif = oif; | |
6109 | ||
58acfd71 | 6110 | dst = ip6_route_output(net, NULL, &fl6); |
18c3a61c RP |
6111 | } |
6112 | ||
18c3a61c | 6113 | |
e8dfd42c | 6114 | rt = dst_rt6_info(dst); |
18c3a61c RP |
6115 | if (rt->dst.error) { |
6116 | err = rt->dst.error; | |
6117 | ip6_rt_put(rt); | |
6118 | goto errout; | |
1da177e4 LT |
6119 | } |
6120 | ||
9d6acb3b WC |
6121 | if (rt == net->ipv6.ip6_null_entry) { |
6122 | err = rt->dst.error; | |
6123 | ip6_rt_put(rt); | |
6124 | goto errout; | |
6125 | } | |
6126 | ||
ab364a6f | 6127 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 6128 | if (!skb) { |
94e187c0 | 6129 | ip6_rt_put(rt); |
ab364a6f TG |
6130 | err = -ENOBUFS; |
6131 | goto errout; | |
6132 | } | |
1da177e4 | 6133 | |
d8d1f30b | 6134 | skb_dst_set(skb, &rt->dst); |
a68886a6 DA |
6135 | |
6136 | rcu_read_lock(); | |
6137 | from = rcu_dereference(rt->from); | |
886b7a50 MKL |
6138 | if (from) { |
6139 | if (fibmatch) | |
6140 | err = rt6_fill_node(net, skb, from, NULL, NULL, NULL, | |
6141 | iif, RTM_NEWROUTE, | |
6142 | NETLINK_CB(in_skb).portid, | |
6143 | nlh->nlmsg_seq, 0); | |
6144 | else | |
6145 | err = rt6_fill_node(net, skb, from, dst, &fl6.daddr, | |
6146 | &fl6.saddr, iif, RTM_NEWROUTE, | |
6147 | NETLINK_CB(in_skb).portid, | |
6148 | nlh->nlmsg_seq, 0); | |
6149 | } else { | |
6150 | err = -ENETUNREACH; | |
6151 | } | |
a68886a6 DA |
6152 | rcu_read_unlock(); |
6153 | ||
1da177e4 | 6154 | if (err < 0) { |
ab364a6f TG |
6155 | kfree_skb(skb); |
6156 | goto errout; | |
1da177e4 LT |
6157 | } |
6158 | ||
15e47304 | 6159 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 6160 | errout: |
1da177e4 | 6161 | return err; |
1da177e4 LT |
6162 | } |
6163 | ||
8d1c802b | 6164 | void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info, |
37a1d361 | 6165 | unsigned int nlm_flags) |
1da177e4 LT |
6166 | { |
6167 | struct sk_buff *skb; | |
5578689a | 6168 | struct net *net = info->nl_net; |
528c4ceb DL |
6169 | u32 seq; |
6170 | int err; | |
6171 | ||
6172 | err = -ENOBUFS; | |
38308473 | 6173 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 6174 | |
19e42e45 | 6175 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 6176 | if (!skb) |
21713ebc TG |
6177 | goto errout; |
6178 | ||
d4ead6b3 DA |
6179 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, |
6180 | event, info->portid, seq, nlm_flags); | |
26932566 PM |
6181 | if (err < 0) { |
6182 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
6183 | WARN_ON(err == -EMSGSIZE); | |
6184 | kfree_skb(skb); | |
6185 | goto errout; | |
6186 | } | |
15e47304 | 6187 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
6188 | info->nlh, gfp_any()); |
6189 | return; | |
21713ebc TG |
6190 | errout: |
6191 | if (err < 0) | |
5578689a | 6192 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
6193 | } |
6194 | ||
19a3b7ee DA |
6195 | void fib6_rt_update(struct net *net, struct fib6_info *rt, |
6196 | struct nl_info *info) | |
6197 | { | |
6198 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
6199 | struct sk_buff *skb; | |
6200 | int err = -ENOBUFS; | |
6201 | ||
19a3b7ee DA |
6202 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
6203 | if (!skb) | |
6204 | goto errout; | |
6205 | ||
6206 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, | |
6207 | RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE); | |
6208 | if (err < 0) { | |
6209 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
6210 | WARN_ON(err == -EMSGSIZE); | |
6211 | kfree_skb(skb); | |
6212 | goto errout; | |
6213 | } | |
6214 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, | |
6215 | info->nlh, gfp_any()); | |
6216 | return; | |
6217 | errout: | |
6218 | if (err < 0) | |
6219 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); | |
6220 | } | |
6221 | ||
907eea48 | 6222 | void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i, |
0c5fcf9e | 6223 | bool offload, bool trap, bool offload_failed) |
907eea48 AC |
6224 | { |
6225 | struct sk_buff *skb; | |
6226 | int err; | |
6227 | ||
d95d6320 ED |
6228 | if (READ_ONCE(f6i->offload) == offload && |
6229 | READ_ONCE(f6i->trap) == trap && | |
6230 | READ_ONCE(f6i->offload_failed) == offload_failed) | |
907eea48 AC |
6231 | return; |
6232 | ||
d95d6320 ED |
6233 | WRITE_ONCE(f6i->offload, offload); |
6234 | WRITE_ONCE(f6i->trap, trap); | |
6fad361a AC |
6235 | |
6236 | /* 2 means send notifications only if offload_failed was changed. */ | |
6237 | if (net->ipv6.sysctl.fib_notify_on_flag_change == 2 && | |
d95d6320 | 6238 | READ_ONCE(f6i->offload_failed) == offload_failed) |
6fad361a AC |
6239 | return; |
6240 | ||
d95d6320 | 6241 | WRITE_ONCE(f6i->offload_failed, offload_failed); |
907eea48 AC |
6242 | |
6243 | if (!rcu_access_pointer(f6i->fib6_node)) | |
6244 | /* The route was removed from the tree, do not send | |
89e8347f | 6245 | * notification. |
907eea48 AC |
6246 | */ |
6247 | return; | |
6248 | ||
6249 | if (!net->ipv6.sysctl.fib_notify_on_flag_change) | |
6250 | return; | |
6251 | ||
6252 | skb = nlmsg_new(rt6_nlmsg_size(f6i), GFP_KERNEL); | |
6253 | if (!skb) { | |
6254 | err = -ENOBUFS; | |
6255 | goto errout; | |
6256 | } | |
6257 | ||
6258 | err = rt6_fill_node(net, skb, f6i, NULL, NULL, NULL, 0, RTM_NEWROUTE, 0, | |
6259 | 0, 0); | |
6260 | if (err < 0) { | |
6261 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
6262 | WARN_ON(err == -EMSGSIZE); | |
6263 | kfree_skb(skb); | |
6264 | goto errout; | |
6265 | } | |
6266 | ||
6267 | rtnl_notify(skb, net, 0, RTNLGRP_IPV6_ROUTE, NULL, GFP_KERNEL); | |
6268 | return; | |
6269 | ||
6270 | errout: | |
6271 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); | |
6272 | } | |
6273 | EXPORT_SYMBOL(fib6_info_hw_flags_set); | |
6274 | ||
8ed67789 | 6275 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 6276 | unsigned long event, void *ptr) |
8ed67789 | 6277 | { |
351638e7 | 6278 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 6279 | struct net *net = dev_net(dev); |
8ed67789 | 6280 | |
242d3a49 WC |
6281 | if (!(dev->flags & IFF_LOOPBACK)) |
6282 | return NOTIFY_OK; | |
6283 | ||
6284 | if (event == NETDEV_REGISTER) { | |
1cf844c7 | 6285 | net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev; |
d8d1f30b | 6286 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
6287 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
6288 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 6289 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 6290 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 6291 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 | 6292 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
242d3a49 | 6293 | #endif |
76da0704 WC |
6294 | } else if (event == NETDEV_UNREGISTER && |
6295 | dev->reg_state != NETREG_UNREGISTERED) { | |
6296 | /* NETDEV_UNREGISTER could be fired for multiple times by | |
6297 | * netdev_wait_allrefs(). Make sure we only call this once. | |
6298 | */ | |
12d94a80 | 6299 | in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev); |
242d3a49 | 6300 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
12d94a80 ED |
6301 | in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev); |
6302 | in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev); | |
8ed67789 DL |
6303 | #endif |
6304 | } | |
6305 | ||
6306 | return NOTIFY_OK; | |
6307 | } | |
6308 | ||
1da177e4 LT |
6309 | /* |
6310 | * /proc | |
6311 | */ | |
6312 | ||
6313 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
6314 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
6315 | { | |
69ddb805 | 6316 | struct net *net = (struct net *)seq->private; |
1da177e4 | 6317 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
6318 | net->ipv6.rt6_stats->fib_nodes, |
6319 | net->ipv6.rt6_stats->fib_route_nodes, | |
81eb8447 | 6320 | atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc), |
69ddb805 DL |
6321 | net->ipv6.rt6_stats->fib_rt_entries, |
6322 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 6323 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 6324 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
6325 | |
6326 | return 0; | |
6327 | } | |
1da177e4 LT |
6328 | #endif /* CONFIG_PROC_FS */ |
6329 | ||
6330 | #ifdef CONFIG_SYSCTL | |
6331 | ||
32927393 CH |
6332 | static int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
6333 | void *buffer, size_t *lenp, loff_t *ppos) | |
1da177e4 | 6334 | { |
c486da34 LAG |
6335 | struct net *net; |
6336 | int delay; | |
f0fb9b28 | 6337 | int ret; |
c486da34 | 6338 | if (!write) |
1da177e4 | 6339 | return -EINVAL; |
c486da34 LAG |
6340 | |
6341 | net = (struct net *)ctl->extra1; | |
6342 | delay = net->ipv6.sysctl.flush_delay; | |
f0fb9b28 AP |
6343 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
6344 | if (ret) | |
6345 | return ret; | |
6346 | ||
2ac3ac8f | 6347 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 6348 | return 0; |
1da177e4 LT |
6349 | } |
6350 | ||
ed792e28 | 6351 | static struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 6352 | { |
06e6c88f AK |
6353 | .procname = "max_size", |
6354 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, | |
1da177e4 | 6355 | .maxlen = sizeof(int), |
06e6c88f AK |
6356 | .mode = 0644, |
6357 | .proc_handler = proc_dointvec, | |
1da177e4 LT |
6358 | }, |
6359 | { | |
1da177e4 | 6360 | .procname = "gc_thresh", |
9a7ec3a9 | 6361 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
6362 | .maxlen = sizeof(int), |
6363 | .mode = 0644, | |
6d9f239a | 6364 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6365 | }, |
6366 | { | |
06e6c88f AK |
6367 | .procname = "flush", |
6368 | .data = &init_net.ipv6.sysctl.flush_delay, | |
1da177e4 | 6369 | .maxlen = sizeof(int), |
06e6c88f AK |
6370 | .mode = 0200, |
6371 | .proc_handler = ipv6_sysctl_rtcache_flush | |
1da177e4 LT |
6372 | }, |
6373 | { | |
1da177e4 | 6374 | .procname = "gc_min_interval", |
4990509f | 6375 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
6376 | .maxlen = sizeof(int), |
6377 | .mode = 0644, | |
6d9f239a | 6378 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6379 | }, |
6380 | { | |
1da177e4 | 6381 | .procname = "gc_timeout", |
4990509f | 6382 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
6383 | .maxlen = sizeof(int), |
6384 | .mode = 0644, | |
6d9f239a | 6385 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6386 | }, |
6387 | { | |
1da177e4 | 6388 | .procname = "gc_interval", |
4990509f | 6389 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
6390 | .maxlen = sizeof(int), |
6391 | .mode = 0644, | |
6d9f239a | 6392 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6393 | }, |
6394 | { | |
1da177e4 | 6395 | .procname = "gc_elasticity", |
4990509f | 6396 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
6397 | .maxlen = sizeof(int), |
6398 | .mode = 0644, | |
f3d3f616 | 6399 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6400 | }, |
6401 | { | |
1da177e4 | 6402 | .procname = "mtu_expires", |
4990509f | 6403 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
6404 | .maxlen = sizeof(int), |
6405 | .mode = 0644, | |
6d9f239a | 6406 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6407 | }, |
6408 | { | |
1da177e4 | 6409 | .procname = "min_adv_mss", |
4990509f | 6410 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
6411 | .maxlen = sizeof(int), |
6412 | .mode = 0644, | |
f3d3f616 | 6413 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6414 | }, |
6415 | { | |
1da177e4 | 6416 | .procname = "gc_min_interval_ms", |
4990509f | 6417 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
6418 | .maxlen = sizeof(int), |
6419 | .mode = 0644, | |
6d9f239a | 6420 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 6421 | }, |
7c6bb7d2 DA |
6422 | { |
6423 | .procname = "skip_notify_on_dev_down", | |
6424 | .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down, | |
ef62c0ae | 6425 | .maxlen = sizeof(u8), |
7c6bb7d2 | 6426 | .mode = 0644, |
ef62c0ae | 6427 | .proc_handler = proc_dou8vec_minmax, |
eec4844f MC |
6428 | .extra1 = SYSCTL_ZERO, |
6429 | .extra2 = SYSCTL_ONE, | |
7c6bb7d2 | 6430 | }, |
1da177e4 LT |
6431 | }; |
6432 | ||
2c8c1e72 | 6433 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
6434 | { |
6435 | struct ctl_table *table; | |
6436 | ||
6437 | table = kmemdup(ipv6_route_table_template, | |
6438 | sizeof(ipv6_route_table_template), | |
6439 | GFP_KERNEL); | |
5ee09105 YH |
6440 | |
6441 | if (table) { | |
06e6c88f | 6442 | table[0].data = &net->ipv6.sysctl.ip6_rt_max_size; |
86393e52 | 6443 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
06e6c88f AK |
6444 | table[2].data = &net->ipv6.sysctl.flush_delay; |
6445 | table[2].extra1 = net; | |
5ee09105 YH |
6446 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
6447 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
6448 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
6449 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
6450 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
6451 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 6452 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
7c6bb7d2 | 6453 | table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down; |
5ee09105 YH |
6454 | } |
6455 | ||
760f2d01 DL |
6456 | return table; |
6457 | } | |
c899710f JG |
6458 | |
6459 | size_t ipv6_route_sysctl_table_size(struct net *net) | |
6460 | { | |
6461 | /* Don't export sysctls to unprivileged users */ | |
6462 | if (net->user_ns != &init_user_ns) | |
6463 | return 1; | |
6464 | ||
6465 | return ARRAY_SIZE(ipv6_route_table_template); | |
6466 | } | |
1da177e4 LT |
6467 | #endif |
6468 | ||
2c8c1e72 | 6469 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 6470 | { |
633d424b | 6471 | int ret = -ENOMEM; |
8ed67789 | 6472 | |
86393e52 AD |
6473 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
6474 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 6475 | |
fc66f95c ED |
6476 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
6477 | goto out_ip6_dst_ops; | |
6478 | ||
1cf844c7 | 6479 | net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true); |
421842ed DA |
6480 | if (!net->ipv6.fib6_null_entry) |
6481 | goto out_ip6_dst_entries; | |
1cf844c7 DA |
6482 | memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template, |
6483 | sizeof(*net->ipv6.fib6_null_entry)); | |
421842ed | 6484 | |
8ed67789 DL |
6485 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
6486 | sizeof(*net->ipv6.ip6_null_entry), | |
6487 | GFP_KERNEL); | |
6488 | if (!net->ipv6.ip6_null_entry) | |
421842ed | 6489 | goto out_fib6_null_entry; |
d8d1f30b | 6490 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6491 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
6492 | ip6_template_metrics, true); | |
d288a162 | 6493 | INIT_LIST_HEAD(&net->ipv6.ip6_null_entry->dst.rt_uncached); |
8ed67789 DL |
6494 | |
6495 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
feca7d8c | 6496 | net->ipv6.fib6_has_custom_rules = false; |
8ed67789 DL |
6497 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, |
6498 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
6499 | GFP_KERNEL); | |
68fffc67 PZ |
6500 | if (!net->ipv6.ip6_prohibit_entry) |
6501 | goto out_ip6_null_entry; | |
d8d1f30b | 6502 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6503 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
6504 | ip6_template_metrics, true); | |
d288a162 | 6505 | INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->dst.rt_uncached); |
8ed67789 DL |
6506 | |
6507 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
6508 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
6509 | GFP_KERNEL); | |
68fffc67 PZ |
6510 | if (!net->ipv6.ip6_blk_hole_entry) |
6511 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 6512 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6513 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
6514 | ip6_template_metrics, true); | |
d288a162 | 6515 | INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->dst.rt_uncached); |
b9b33e7c PA |
6516 | #ifdef CONFIG_IPV6_SUBTREES |
6517 | net->ipv6.fib6_routes_require_src = 0; | |
6518 | #endif | |
8ed67789 DL |
6519 | #endif |
6520 | ||
b339a47c | 6521 | net->ipv6.sysctl.flush_delay = 0; |
af6d1034 | 6522 | net->ipv6.sysctl.ip6_rt_max_size = INT_MAX; |
b339a47c PZ |
6523 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; |
6524 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
6525 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
6526 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
6527 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
6528 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
7c6bb7d2 | 6529 | net->ipv6.sysctl.skip_notify_on_dev_down = 0; |
b339a47c | 6530 | |
9cb7c013 | 6531 | atomic_set(&net->ipv6.ip6_rt_gc_expire, 30*HZ); |
6891a346 | 6532 | |
8ed67789 DL |
6533 | ret = 0; |
6534 | out: | |
6535 | return ret; | |
f2fc6a54 | 6536 | |
68fffc67 PZ |
6537 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
6538 | out_ip6_prohibit_entry: | |
6539 | kfree(net->ipv6.ip6_prohibit_entry); | |
6540 | out_ip6_null_entry: | |
6541 | kfree(net->ipv6.ip6_null_entry); | |
6542 | #endif | |
421842ed DA |
6543 | out_fib6_null_entry: |
6544 | kfree(net->ipv6.fib6_null_entry); | |
fc66f95c ED |
6545 | out_ip6_dst_entries: |
6546 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 6547 | out_ip6_dst_ops: |
f2fc6a54 | 6548 | goto out; |
cdb18761 DL |
6549 | } |
6550 | ||
2c8c1e72 | 6551 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 6552 | { |
421842ed | 6553 | kfree(net->ipv6.fib6_null_entry); |
8ed67789 DL |
6554 | kfree(net->ipv6.ip6_null_entry); |
6555 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
6556 | kfree(net->ipv6.ip6_prohibit_entry); | |
6557 | kfree(net->ipv6.ip6_blk_hole_entry); | |
6558 | #endif | |
41bb78b4 | 6559 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
6560 | } |
6561 | ||
d189634e TG |
6562 | static int __net_init ip6_route_net_init_late(struct net *net) |
6563 | { | |
6564 | #ifdef CONFIG_PROC_FS | |
768b3c74 ZS |
6565 | if (!proc_create_net("ipv6_route", 0, net->proc_net, |
6566 | &ipv6_route_seq_ops, | |
6567 | sizeof(struct ipv6_route_iter))) | |
6568 | return -ENOMEM; | |
6569 | ||
6570 | if (!proc_create_net_single("rt6_stats", 0444, net->proc_net, | |
6571 | rt6_stats_seq_show, NULL)) { | |
6572 | remove_proc_entry("ipv6_route", net->proc_net); | |
6573 | return -ENOMEM; | |
6574 | } | |
d189634e TG |
6575 | #endif |
6576 | return 0; | |
6577 | } | |
6578 | ||
6579 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
6580 | { | |
6581 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
6582 | remove_proc_entry("ipv6_route", net->proc_net); |
6583 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
6584 | #endif |
6585 | } | |
6586 | ||
cdb18761 DL |
6587 | static struct pernet_operations ip6_route_net_ops = { |
6588 | .init = ip6_route_net_init, | |
6589 | .exit = ip6_route_net_exit, | |
6590 | }; | |
6591 | ||
c3426b47 DM |
6592 | static int __net_init ipv6_inetpeer_init(struct net *net) |
6593 | { | |
6594 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
6595 | ||
6596 | if (!bp) | |
6597 | return -ENOMEM; | |
6598 | inet_peer_base_init(bp); | |
6599 | net->ipv6.peers = bp; | |
6600 | return 0; | |
6601 | } | |
6602 | ||
6603 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
6604 | { | |
6605 | struct inet_peer_base *bp = net->ipv6.peers; | |
6606 | ||
6607 | net->ipv6.peers = NULL; | |
56a6b248 | 6608 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
6609 | kfree(bp); |
6610 | } | |
6611 | ||
2b823f72 | 6612 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
6613 | .init = ipv6_inetpeer_init, |
6614 | .exit = ipv6_inetpeer_exit, | |
6615 | }; | |
6616 | ||
d189634e TG |
6617 | static struct pernet_operations ip6_route_net_late_ops = { |
6618 | .init = ip6_route_net_init_late, | |
6619 | .exit = ip6_route_net_exit_late, | |
6620 | }; | |
6621 | ||
8ed67789 DL |
6622 | static struct notifier_block ip6_route_dev_notifier = { |
6623 | .notifier_call = ip6_route_dev_notify, | |
242d3a49 | 6624 | .priority = ADDRCONF_NOTIFY_PRIORITY - 10, |
8ed67789 DL |
6625 | }; |
6626 | ||
2f460933 WC |
6627 | void __init ip6_route_init_special_entries(void) |
6628 | { | |
6629 | /* Registering of the loopback is done before this portion of code, | |
6630 | * the loopback reference in rt6_info will not be taken, do it | |
6631 | * manually for init_net */ | |
1cf844c7 | 6632 | init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev; |
2f460933 WC |
6633 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
6634 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6635 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
6636 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; | |
6637 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6638 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; | |
6639 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6640 | #endif | |
6641 | } | |
6642 | ||
138d0be3 YS |
6643 | #if IS_BUILTIN(CONFIG_IPV6) |
6644 | #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS) | |
6645 | DEFINE_BPF_ITER_FUNC(ipv6_route, struct bpf_iter_meta *meta, struct fib6_info *rt) | |
6646 | ||
951cf368 YS |
6647 | BTF_ID_LIST(btf_fib6_info_id) |
6648 | BTF_ID(struct, fib6_info) | |
6649 | ||
14fc6bd6 | 6650 | static const struct bpf_iter_seq_info ipv6_route_seq_info = { |
15172a46 YS |
6651 | .seq_ops = &ipv6_route_seq_ops, |
6652 | .init_seq_private = bpf_iter_init_seq_net, | |
6653 | .fini_seq_private = bpf_iter_fini_seq_net, | |
6654 | .seq_priv_size = sizeof(struct ipv6_route_iter), | |
14fc6bd6 YS |
6655 | }; |
6656 | ||
6657 | static struct bpf_iter_reg ipv6_route_reg_info = { | |
6658 | .target = "ipv6_route", | |
3c32cc1b YS |
6659 | .ctx_arg_info_size = 1, |
6660 | .ctx_arg_info = { | |
6661 | { offsetof(struct bpf_iter__ipv6_route, rt), | |
6662 | PTR_TO_BTF_ID_OR_NULL }, | |
6663 | }, | |
14fc6bd6 | 6664 | .seq_info = &ipv6_route_seq_info, |
15172a46 YS |
6665 | }; |
6666 | ||
138d0be3 YS |
6667 | static int __init bpf_iter_register(void) |
6668 | { | |
951cf368 | 6669 | ipv6_route_reg_info.ctx_arg_info[0].btf_id = *btf_fib6_info_id; |
15172a46 | 6670 | return bpf_iter_reg_target(&ipv6_route_reg_info); |
138d0be3 YS |
6671 | } |
6672 | ||
6673 | static void bpf_iter_unregister(void) | |
6674 | { | |
ab2ee4fc | 6675 | bpf_iter_unreg_target(&ipv6_route_reg_info); |
138d0be3 YS |
6676 | } |
6677 | #endif | |
6678 | #endif | |
6679 | ||
433d49c3 | 6680 | int __init ip6_route_init(void) |
1da177e4 | 6681 | { |
433d49c3 | 6682 | int ret; |
8d0b94af | 6683 | int cpu; |
433d49c3 | 6684 | |
9a7ec3a9 DL |
6685 | ret = -ENOMEM; |
6686 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 6687 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
6126891c | 6688 | SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT, NULL); |
9a7ec3a9 | 6689 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 6690 | goto out; |
14e50e57 | 6691 | |
fc66f95c | 6692 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 6693 | if (ret) |
bdb3289f | 6694 | goto out_kmem_cache; |
bdb3289f | 6695 | |
c3426b47 DM |
6696 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
6697 | if (ret) | |
e8803b6c | 6698 | goto out_dst_entries; |
2a0c451a | 6699 | |
7e52b33b DM |
6700 | ret = register_pernet_subsys(&ip6_route_net_ops); |
6701 | if (ret) | |
6702 | goto out_register_inetpeer; | |
c3426b47 | 6703 | |
5dc121e9 AE |
6704 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
6705 | ||
e8803b6c | 6706 | ret = fib6_init(); |
433d49c3 | 6707 | if (ret) |
8ed67789 | 6708 | goto out_register_subsys; |
433d49c3 | 6709 | |
433d49c3 DL |
6710 | ret = xfrm6_init(); |
6711 | if (ret) | |
e8803b6c | 6712 | goto out_fib6_init; |
c35b7e72 | 6713 | |
433d49c3 DL |
6714 | ret = fib6_rules_init(); |
6715 | if (ret) | |
6716 | goto xfrm6_init; | |
7e5449c2 | 6717 | |
d189634e TG |
6718 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
6719 | if (ret) | |
6720 | goto fib6_rules_init; | |
6721 | ||
16feebcf FW |
6722 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE, |
6723 | inet6_rtm_newroute, NULL, 0); | |
6724 | if (ret < 0) | |
6725 | goto out_register_late_subsys; | |
6726 | ||
6727 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE, | |
6728 | inet6_rtm_delroute, NULL, 0); | |
6729 | if (ret < 0) | |
6730 | goto out_register_late_subsys; | |
6731 | ||
6732 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE, | |
6733 | inet6_rtm_getroute, NULL, | |
6734 | RTNL_FLAG_DOIT_UNLOCKED); | |
6735 | if (ret < 0) | |
d189634e | 6736 | goto out_register_late_subsys; |
c127ea2c | 6737 | |
8ed67789 | 6738 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 6739 | if (ret) |
d189634e | 6740 | goto out_register_late_subsys; |
8ed67789 | 6741 | |
138d0be3 YS |
6742 | #if IS_BUILTIN(CONFIG_IPV6) |
6743 | #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS) | |
6744 | ret = bpf_iter_register(); | |
6745 | if (ret) | |
6746 | goto out_register_late_subsys; | |
6747 | #endif | |
6748 | #endif | |
6749 | ||
8d0b94af MKL |
6750 | for_each_possible_cpu(cpu) { |
6751 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
6752 | ||
6753 | INIT_LIST_HEAD(&ul->head); | |
ba55ef81 | 6754 | INIT_LIST_HEAD(&ul->quarantine); |
8d0b94af MKL |
6755 | spin_lock_init(&ul->lock); |
6756 | } | |
6757 | ||
433d49c3 DL |
6758 | out: |
6759 | return ret; | |
6760 | ||
d189634e | 6761 | out_register_late_subsys: |
16feebcf | 6762 | rtnl_unregister_all(PF_INET6); |
d189634e | 6763 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
433d49c3 | 6764 | fib6_rules_init: |
433d49c3 DL |
6765 | fib6_rules_cleanup(); |
6766 | xfrm6_init: | |
433d49c3 | 6767 | xfrm6_fini(); |
2a0c451a TG |
6768 | out_fib6_init: |
6769 | fib6_gc_cleanup(); | |
8ed67789 DL |
6770 | out_register_subsys: |
6771 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
6772 | out_register_inetpeer: |
6773 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
6774 | out_dst_entries: |
6775 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 6776 | out_kmem_cache: |
f2fc6a54 | 6777 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 6778 | goto out; |
1da177e4 LT |
6779 | } |
6780 | ||
6781 | void ip6_route_cleanup(void) | |
6782 | { | |
138d0be3 YS |
6783 | #if IS_BUILTIN(CONFIG_IPV6) |
6784 | #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS) | |
6785 | bpf_iter_unregister(); | |
6786 | #endif | |
6787 | #endif | |
8ed67789 | 6788 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 6789 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 6790 | fib6_rules_cleanup(); |
1da177e4 | 6791 | xfrm6_fini(); |
1da177e4 | 6792 | fib6_gc_cleanup(); |
c3426b47 | 6793 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 6794 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 6795 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 6796 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 6797 | } |