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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
f3213831 JP |
27 | #define pr_fmt(fmt) "IPv6: " fmt |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 | 30 | #include <linux/errno.h> |
bc3b2d7f | 31 | #include <linux/export.h> |
1da177e4 LT |
32 | #include <linux/types.h> |
33 | #include <linux/times.h> | |
34 | #include <linux/socket.h> | |
35 | #include <linux/sockios.h> | |
36 | #include <linux/net.h> | |
37 | #include <linux/route.h> | |
38 | #include <linux/netdevice.h> | |
39 | #include <linux/in6.h> | |
7bc570c8 | 40 | #include <linux/mroute6.h> |
1da177e4 | 41 | #include <linux/init.h> |
1da177e4 | 42 | #include <linux/if_arp.h> |
1da177e4 LT |
43 | #include <linux/proc_fs.h> |
44 | #include <linux/seq_file.h> | |
5b7c931d | 45 | #include <linux/nsproxy.h> |
5a0e3ad6 | 46 | #include <linux/slab.h> |
35732d01 | 47 | #include <linux/jhash.h> |
457c4cbc | 48 | #include <net/net_namespace.h> |
1da177e4 LT |
49 | #include <net/snmp.h> |
50 | #include <net/ipv6.h> | |
51 | #include <net/ip6_fib.h> | |
52 | #include <net/ip6_route.h> | |
53 | #include <net/ndisc.h> | |
54 | #include <net/addrconf.h> | |
55 | #include <net/tcp.h> | |
56 | #include <linux/rtnetlink.h> | |
57 | #include <net/dst.h> | |
904af04d | 58 | #include <net/dst_metadata.h> |
1da177e4 | 59 | #include <net/xfrm.h> |
8d71740c | 60 | #include <net/netevent.h> |
21713ebc | 61 | #include <net/netlink.h> |
51ebd318 | 62 | #include <net/nexthop.h> |
19e42e45 | 63 | #include <net/lwtunnel.h> |
904af04d | 64 | #include <net/ip_tunnels.h> |
ca254490 | 65 | #include <net/l3mdev.h> |
b811580d | 66 | #include <trace/events/fib6.h> |
1da177e4 | 67 | |
7c0f6ba6 | 68 | #include <linux/uaccess.h> |
1da177e4 LT |
69 | |
70 | #ifdef CONFIG_SYSCTL | |
71 | #include <linux/sysctl.h> | |
72 | #endif | |
73 | ||
afc154e9 | 74 | enum rt6_nud_state { |
7e980569 JB |
75 | RT6_NUD_FAIL_HARD = -3, |
76 | RT6_NUD_FAIL_PROBE = -2, | |
77 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
78 | RT6_NUD_SUCCEED = 1 |
79 | }; | |
80 | ||
83a09abd | 81 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort); |
1da177e4 | 82 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 83 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 84 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
85 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
86 | static void ip6_dst_destroy(struct dst_entry *); | |
87 | static void ip6_dst_ifdown(struct dst_entry *, | |
88 | struct net_device *dev, int how); | |
569d3645 | 89 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
90 | |
91 | static int ip6_pkt_discard(struct sk_buff *skb); | |
ede2059d | 92 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
7150aede | 93 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
ede2059d | 94 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 95 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
96 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
97 | struct sk_buff *skb, u32 mtu); | |
98 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
99 | struct sk_buff *skb); | |
4b32b5ad | 100 | static void rt6_dst_from_metrics_check(struct rt6_info *rt); |
52bd4c0c | 101 | static int rt6_score_route(struct rt6_info *rt, int oif, int strict); |
16a16cd3 DA |
102 | static size_t rt6_nlmsg_size(struct rt6_info *rt); |
103 | static int rt6_fill_node(struct net *net, | |
104 | struct sk_buff *skb, struct rt6_info *rt, | |
105 | struct in6_addr *dst, struct in6_addr *src, | |
106 | int iif, int type, u32 portid, u32 seq, | |
107 | unsigned int flags); | |
35732d01 WW |
108 | static struct rt6_info *rt6_find_cached_rt(struct rt6_info *rt, |
109 | struct in6_addr *daddr, | |
110 | struct in6_addr *saddr); | |
1da177e4 | 111 | |
70ceb4f5 | 112 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 113 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 114 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
115 | const struct in6_addr *gwaddr, |
116 | struct net_device *dev, | |
95c96174 | 117 | unsigned int pref); |
efa2cea0 | 118 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 119 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
120 | const struct in6_addr *gwaddr, |
121 | struct net_device *dev); | |
70ceb4f5 YH |
122 | #endif |
123 | ||
8d0b94af MKL |
124 | struct uncached_list { |
125 | spinlock_t lock; | |
126 | struct list_head head; | |
127 | }; | |
128 | ||
129 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
130 | ||
131 | static void rt6_uncached_list_add(struct rt6_info *rt) | |
132 | { | |
133 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
134 | ||
8d0b94af MKL |
135 | rt->rt6i_uncached_list = ul; |
136 | ||
137 | spin_lock_bh(&ul->lock); | |
138 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
139 | spin_unlock_bh(&ul->lock); | |
140 | } | |
141 | ||
142 | static void rt6_uncached_list_del(struct rt6_info *rt) | |
143 | { | |
144 | if (!list_empty(&rt->rt6i_uncached)) { | |
145 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
81eb8447 | 146 | struct net *net = dev_net(rt->dst.dev); |
8d0b94af MKL |
147 | |
148 | spin_lock_bh(&ul->lock); | |
149 | list_del(&rt->rt6i_uncached); | |
81eb8447 | 150 | atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache); |
8d0b94af MKL |
151 | spin_unlock_bh(&ul->lock); |
152 | } | |
153 | } | |
154 | ||
155 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
156 | { | |
157 | struct net_device *loopback_dev = net->loopback_dev; | |
158 | int cpu; | |
159 | ||
e332bc67 EB |
160 | if (dev == loopback_dev) |
161 | return; | |
162 | ||
8d0b94af MKL |
163 | for_each_possible_cpu(cpu) { |
164 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
165 | struct rt6_info *rt; | |
166 | ||
167 | spin_lock_bh(&ul->lock); | |
168 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
169 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
170 | struct net_device *rt_dev = rt->dst.dev; | |
171 | ||
e332bc67 | 172 | if (rt_idev->dev == dev) { |
8d0b94af MKL |
173 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
174 | in6_dev_put(rt_idev); | |
175 | } | |
176 | ||
e332bc67 | 177 | if (rt_dev == dev) { |
8d0b94af MKL |
178 | rt->dst.dev = loopback_dev; |
179 | dev_hold(rt->dst.dev); | |
180 | dev_put(rt_dev); | |
181 | } | |
182 | } | |
183 | spin_unlock_bh(&ul->lock); | |
184 | } | |
185 | } | |
186 | ||
d52d3997 MKL |
187 | static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt) |
188 | { | |
3a2232e9 | 189 | return dst_metrics_write_ptr(&rt->from->dst); |
d52d3997 MKL |
190 | } |
191 | ||
06582540 DM |
192 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
193 | { | |
4b32b5ad | 194 | struct rt6_info *rt = (struct rt6_info *)dst; |
06582540 | 195 | |
d52d3997 MKL |
196 | if (rt->rt6i_flags & RTF_PCPU) |
197 | return rt6_pcpu_cow_metrics(rt); | |
198 | else if (rt->rt6i_flags & RTF_CACHE) | |
4b32b5ad MKL |
199 | return NULL; |
200 | else | |
3b471175 | 201 | return dst_cow_metrics_generic(dst, old); |
06582540 DM |
202 | } |
203 | ||
f894cbf8 DM |
204 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
205 | struct sk_buff *skb, | |
206 | const void *daddr) | |
39232973 DM |
207 | { |
208 | struct in6_addr *p = &rt->rt6i_gateway; | |
209 | ||
a7563f34 | 210 | if (!ipv6_addr_any(p)) |
39232973 | 211 | return (const void *) p; |
f894cbf8 DM |
212 | else if (skb) |
213 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
214 | return daddr; |
215 | } | |
216 | ||
f894cbf8 DM |
217 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
218 | struct sk_buff *skb, | |
219 | const void *daddr) | |
d3aaeb38 | 220 | { |
39232973 DM |
221 | struct rt6_info *rt = (struct rt6_info *) dst; |
222 | struct neighbour *n; | |
223 | ||
f894cbf8 | 224 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 225 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
226 | if (n) |
227 | return n; | |
228 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
229 | } | |
230 | ||
63fca65d JA |
231 | static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
232 | { | |
233 | struct net_device *dev = dst->dev; | |
234 | struct rt6_info *rt = (struct rt6_info *)dst; | |
235 | ||
236 | daddr = choose_neigh_daddr(rt, NULL, daddr); | |
237 | if (!daddr) | |
238 | return; | |
239 | if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) | |
240 | return; | |
241 | if (ipv6_addr_is_multicast((const struct in6_addr *)daddr)) | |
242 | return; | |
243 | __ipv6_confirm_neigh(dev, daddr); | |
244 | } | |
245 | ||
9a7ec3a9 | 246 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 247 | .family = AF_INET6, |
1da177e4 LT |
248 | .gc = ip6_dst_gc, |
249 | .gc_thresh = 1024, | |
250 | .check = ip6_dst_check, | |
0dbaee3b | 251 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 252 | .mtu = ip6_mtu, |
06582540 | 253 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
254 | .destroy = ip6_dst_destroy, |
255 | .ifdown = ip6_dst_ifdown, | |
256 | .negative_advice = ip6_negative_advice, | |
257 | .link_failure = ip6_link_failure, | |
258 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 259 | .redirect = rt6_do_redirect, |
9f8955cc | 260 | .local_out = __ip6_local_out, |
d3aaeb38 | 261 | .neigh_lookup = ip6_neigh_lookup, |
63fca65d | 262 | .confirm_neigh = ip6_confirm_neigh, |
1da177e4 LT |
263 | }; |
264 | ||
ebb762f2 | 265 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 266 | { |
618f9bc7 SK |
267 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
268 | ||
269 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
270 | } |
271 | ||
6700c270 DM |
272 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
273 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
274 | { |
275 | } | |
276 | ||
6700c270 DM |
277 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
278 | struct sk_buff *skb) | |
b587ee3b DM |
279 | { |
280 | } | |
281 | ||
14e50e57 DM |
282 | static struct dst_ops ip6_dst_blackhole_ops = { |
283 | .family = AF_INET6, | |
14e50e57 DM |
284 | .destroy = ip6_dst_destroy, |
285 | .check = ip6_dst_check, | |
ebb762f2 | 286 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 287 | .default_advmss = ip6_default_advmss, |
14e50e57 | 288 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 289 | .redirect = ip6_rt_blackhole_redirect, |
0a1f5962 | 290 | .cow_metrics = dst_cow_metrics_generic, |
d3aaeb38 | 291 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
292 | }; |
293 | ||
62fa8a84 | 294 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 295 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
296 | }; |
297 | ||
fb0af4c7 | 298 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
299 | .dst = { |
300 | .__refcnt = ATOMIC_INIT(1), | |
301 | .__use = 1, | |
2c20cbd7 | 302 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 303 | .error = -ENETUNREACH, |
d8d1f30b CG |
304 | .input = ip6_pkt_discard, |
305 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
306 | }, |
307 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 308 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
309 | .rt6i_metric = ~(u32) 0, |
310 | .rt6i_ref = ATOMIC_INIT(1), | |
311 | }; | |
312 | ||
101367c2 TG |
313 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
314 | ||
fb0af4c7 | 315 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
316 | .dst = { |
317 | .__refcnt = ATOMIC_INIT(1), | |
318 | .__use = 1, | |
2c20cbd7 | 319 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 320 | .error = -EACCES, |
d8d1f30b CG |
321 | .input = ip6_pkt_prohibit, |
322 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
323 | }, |
324 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 325 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
326 | .rt6i_metric = ~(u32) 0, |
327 | .rt6i_ref = ATOMIC_INIT(1), | |
328 | }; | |
329 | ||
fb0af4c7 | 330 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
331 | .dst = { |
332 | .__refcnt = ATOMIC_INIT(1), | |
333 | .__use = 1, | |
2c20cbd7 | 334 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 335 | .error = -EINVAL, |
d8d1f30b | 336 | .input = dst_discard, |
ede2059d | 337 | .output = dst_discard_out, |
101367c2 TG |
338 | }, |
339 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 340 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
341 | .rt6i_metric = ~(u32) 0, |
342 | .rt6i_ref = ATOMIC_INIT(1), | |
343 | }; | |
344 | ||
345 | #endif | |
346 | ||
ebfa45f0 MKL |
347 | static void rt6_info_init(struct rt6_info *rt) |
348 | { | |
349 | struct dst_entry *dst = &rt->dst; | |
350 | ||
351 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
352 | INIT_LIST_HEAD(&rt->rt6i_siblings); | |
353 | INIT_LIST_HEAD(&rt->rt6i_uncached); | |
354 | } | |
355 | ||
1da177e4 | 356 | /* allocate dst with ip6_dst_ops */ |
d52d3997 MKL |
357 | static struct rt6_info *__ip6_dst_alloc(struct net *net, |
358 | struct net_device *dev, | |
ad706862 | 359 | int flags) |
1da177e4 | 360 | { |
97bab73f | 361 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
b2a9c0ed | 362 | 1, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 363 | |
81eb8447 | 364 | if (rt) { |
ebfa45f0 | 365 | rt6_info_init(rt); |
81eb8447 WW |
366 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
367 | } | |
8104891b | 368 | |
cf911662 | 369 | return rt; |
1da177e4 LT |
370 | } |
371 | ||
9ab179d8 DA |
372 | struct rt6_info *ip6_dst_alloc(struct net *net, |
373 | struct net_device *dev, | |
374 | int flags) | |
d52d3997 | 375 | { |
ad706862 | 376 | struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags); |
d52d3997 MKL |
377 | |
378 | if (rt) { | |
379 | rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC); | |
bfd8e5a4 | 380 | if (!rt->rt6i_pcpu) { |
587fea74 | 381 | dst_release_immediate(&rt->dst); |
d52d3997 MKL |
382 | return NULL; |
383 | } | |
384 | } | |
385 | ||
386 | return rt; | |
387 | } | |
9ab179d8 | 388 | EXPORT_SYMBOL(ip6_dst_alloc); |
d52d3997 | 389 | |
1da177e4 LT |
390 | static void ip6_dst_destroy(struct dst_entry *dst) |
391 | { | |
392 | struct rt6_info *rt = (struct rt6_info *)dst; | |
35732d01 | 393 | struct rt6_exception_bucket *bucket; |
3a2232e9 | 394 | struct rt6_info *from = rt->from; |
8d0b94af | 395 | struct inet6_dev *idev; |
1da177e4 | 396 | |
4b32b5ad | 397 | dst_destroy_metrics_generic(dst); |
87775312 | 398 | free_percpu(rt->rt6i_pcpu); |
8d0b94af MKL |
399 | rt6_uncached_list_del(rt); |
400 | ||
401 | idev = rt->rt6i_idev; | |
38308473 | 402 | if (idev) { |
1da177e4 LT |
403 | rt->rt6i_idev = NULL; |
404 | in6_dev_put(idev); | |
1ab1457c | 405 | } |
35732d01 WW |
406 | bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, 1); |
407 | if (bucket) { | |
408 | rt->rt6i_exception_bucket = NULL; | |
409 | kfree(bucket); | |
410 | } | |
1716a961 | 411 | |
3a2232e9 DM |
412 | rt->from = NULL; |
413 | dst_release(&from->dst); | |
b3419363 DM |
414 | } |
415 | ||
1da177e4 LT |
416 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
417 | int how) | |
418 | { | |
419 | struct rt6_info *rt = (struct rt6_info *)dst; | |
420 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 421 | struct net_device *loopback_dev = |
c346dca1 | 422 | dev_net(dev)->loopback_dev; |
1da177e4 | 423 | |
e5645f51 WW |
424 | if (idev && idev->dev != loopback_dev) { |
425 | struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev); | |
426 | if (loopback_idev) { | |
427 | rt->rt6i_idev = loopback_idev; | |
428 | in6_dev_put(idev); | |
97cac082 | 429 | } |
1da177e4 LT |
430 | } |
431 | } | |
432 | ||
5973fb1e MKL |
433 | static bool __rt6_check_expired(const struct rt6_info *rt) |
434 | { | |
435 | if (rt->rt6i_flags & RTF_EXPIRES) | |
436 | return time_after(jiffies, rt->dst.expires); | |
437 | else | |
438 | return false; | |
439 | } | |
440 | ||
a50feda5 | 441 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 442 | { |
1716a961 G |
443 | if (rt->rt6i_flags & RTF_EXPIRES) { |
444 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 445 | return true; |
3a2232e9 | 446 | } else if (rt->from) { |
1e2ea8ad | 447 | return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK || |
3a2232e9 | 448 | rt6_check_expired(rt->from); |
1716a961 | 449 | } |
a50feda5 | 450 | return false; |
1da177e4 LT |
451 | } |
452 | ||
51ebd318 | 453 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, |
52bd4c0c ND |
454 | struct flowi6 *fl6, int oif, |
455 | int strict) | |
51ebd318 ND |
456 | { |
457 | struct rt6_info *sibling, *next_sibling; | |
458 | int route_choosen; | |
459 | ||
b673d6cc JS |
460 | /* We might have already computed the hash for ICMPv6 errors. In such |
461 | * case it will always be non-zero. Otherwise now is the time to do it. | |
462 | */ | |
463 | if (!fl6->mp_hash) | |
464 | fl6->mp_hash = rt6_multipath_hash(fl6, NULL); | |
465 | ||
466 | route_choosen = fl6->mp_hash % (match->rt6i_nsiblings + 1); | |
51ebd318 ND |
467 | /* Don't change the route, if route_choosen == 0 |
468 | * (siblings does not include ourself) | |
469 | */ | |
470 | if (route_choosen) | |
471 | list_for_each_entry_safe(sibling, next_sibling, | |
472 | &match->rt6i_siblings, rt6i_siblings) { | |
473 | route_choosen--; | |
474 | if (route_choosen == 0) { | |
bbfcd776 IS |
475 | struct inet6_dev *idev = sibling->rt6i_idev; |
476 | ||
8067bb8c IS |
477 | if (sibling->rt6i_nh_flags & RTNH_F_DEAD) |
478 | break; | |
14c5206c | 479 | if (sibling->rt6i_nh_flags & RTNH_F_LINKDOWN && |
bbfcd776 IS |
480 | idev->cnf.ignore_routes_with_linkdown) |
481 | break; | |
52bd4c0c ND |
482 | if (rt6_score_route(sibling, oif, strict) < 0) |
483 | break; | |
51ebd318 ND |
484 | match = sibling; |
485 | break; | |
486 | } | |
487 | } | |
488 | return match; | |
489 | } | |
490 | ||
1da177e4 | 491 | /* |
66f5d6ce | 492 | * Route lookup. rcu_read_lock() should be held. |
1da177e4 LT |
493 | */ |
494 | ||
8ed67789 DL |
495 | static inline struct rt6_info *rt6_device_match(struct net *net, |
496 | struct rt6_info *rt, | |
b71d1d42 | 497 | const struct in6_addr *saddr, |
1da177e4 | 498 | int oif, |
d420895e | 499 | int flags) |
1da177e4 LT |
500 | { |
501 | struct rt6_info *local = NULL; | |
502 | struct rt6_info *sprt; | |
503 | ||
8067bb8c IS |
504 | if (!oif && ipv6_addr_any(saddr) && !(rt->rt6i_nh_flags & RTNH_F_DEAD)) |
505 | return rt; | |
dd3abc4e | 506 | |
071fb37e | 507 | for (sprt = rt; sprt; sprt = rcu_dereference(sprt->rt6_next)) { |
d1918542 | 508 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e | 509 | |
8067bb8c IS |
510 | if (sprt->rt6i_nh_flags & RTNH_F_DEAD) |
511 | continue; | |
512 | ||
dd3abc4e | 513 | if (oif) { |
1da177e4 LT |
514 | if (dev->ifindex == oif) |
515 | return sprt; | |
516 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 517 | if (!sprt->rt6i_idev || |
1da177e4 | 518 | sprt->rt6i_idev->dev->ifindex != oif) { |
17fb0b2b | 519 | if (flags & RT6_LOOKUP_F_IFACE) |
1da177e4 | 520 | continue; |
17fb0b2b DA |
521 | if (local && |
522 | local->rt6i_idev->dev->ifindex == oif) | |
1da177e4 LT |
523 | continue; |
524 | } | |
525 | local = sprt; | |
526 | } | |
dd3abc4e YH |
527 | } else { |
528 | if (ipv6_chk_addr(net, saddr, dev, | |
529 | flags & RT6_LOOKUP_F_IFACE)) | |
530 | return sprt; | |
1da177e4 | 531 | } |
dd3abc4e | 532 | } |
1da177e4 | 533 | |
dd3abc4e | 534 | if (oif) { |
1da177e4 LT |
535 | if (local) |
536 | return local; | |
537 | ||
d420895e | 538 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 539 | return net->ipv6.ip6_null_entry; |
1da177e4 | 540 | } |
8067bb8c IS |
541 | |
542 | return rt->rt6i_nh_flags & RTNH_F_DEAD ? net->ipv6.ip6_null_entry : rt; | |
1da177e4 LT |
543 | } |
544 | ||
27097255 | 545 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
546 | struct __rt6_probe_work { |
547 | struct work_struct work; | |
548 | struct in6_addr target; | |
549 | struct net_device *dev; | |
550 | }; | |
551 | ||
552 | static void rt6_probe_deferred(struct work_struct *w) | |
553 | { | |
554 | struct in6_addr mcaddr; | |
555 | struct __rt6_probe_work *work = | |
556 | container_of(w, struct __rt6_probe_work, work); | |
557 | ||
558 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
adc176c5 | 559 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0); |
c2f17e82 | 560 | dev_put(work->dev); |
662f5533 | 561 | kfree(work); |
c2f17e82 HFS |
562 | } |
563 | ||
27097255 YH |
564 | static void rt6_probe(struct rt6_info *rt) |
565 | { | |
990edb42 | 566 | struct __rt6_probe_work *work; |
f2c31e32 | 567 | struct neighbour *neigh; |
27097255 YH |
568 | /* |
569 | * Okay, this does not seem to be appropriate | |
570 | * for now, however, we need to check if it | |
571 | * is really so; aka Router Reachability Probing. | |
572 | * | |
573 | * Router Reachability Probe MUST be rate-limited | |
574 | * to no more than one per minute. | |
575 | */ | |
2152caea | 576 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 577 | return; |
2152caea YH |
578 | rcu_read_lock_bh(); |
579 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
580 | if (neigh) { | |
8d6c31bf MKL |
581 | if (neigh->nud_state & NUD_VALID) |
582 | goto out; | |
583 | ||
990edb42 | 584 | work = NULL; |
2152caea | 585 | write_lock(&neigh->lock); |
990edb42 MKL |
586 | if (!(neigh->nud_state & NUD_VALID) && |
587 | time_after(jiffies, | |
588 | neigh->updated + | |
589 | rt->rt6i_idev->cnf.rtr_probe_interval)) { | |
590 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
591 | if (work) | |
592 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 593 | } |
2152caea | 594 | write_unlock(&neigh->lock); |
990edb42 MKL |
595 | } else { |
596 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
f2c31e32 | 597 | } |
990edb42 MKL |
598 | |
599 | if (work) { | |
600 | INIT_WORK(&work->work, rt6_probe_deferred); | |
601 | work->target = rt->rt6i_gateway; | |
602 | dev_hold(rt->dst.dev); | |
603 | work->dev = rt->dst.dev; | |
604 | schedule_work(&work->work); | |
605 | } | |
606 | ||
8d6c31bf | 607 | out: |
2152caea | 608 | rcu_read_unlock_bh(); |
27097255 YH |
609 | } |
610 | #else | |
611 | static inline void rt6_probe(struct rt6_info *rt) | |
612 | { | |
27097255 YH |
613 | } |
614 | #endif | |
615 | ||
1da177e4 | 616 | /* |
554cfb7e | 617 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 618 | */ |
b6f99a21 | 619 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 620 | { |
d1918542 | 621 | struct net_device *dev = rt->dst.dev; |
161980f4 | 622 | if (!oif || dev->ifindex == oif) |
554cfb7e | 623 | return 2; |
161980f4 DM |
624 | if ((dev->flags & IFF_LOOPBACK) && |
625 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
626 | return 1; | |
627 | return 0; | |
554cfb7e | 628 | } |
1da177e4 | 629 | |
afc154e9 | 630 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 631 | { |
f2c31e32 | 632 | struct neighbour *neigh; |
afc154e9 | 633 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 634 | |
4d0c5911 YH |
635 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
636 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 637 | return RT6_NUD_SUCCEED; |
145a3621 YH |
638 | |
639 | rcu_read_lock_bh(); | |
640 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
641 | if (neigh) { | |
642 | read_lock(&neigh->lock); | |
554cfb7e | 643 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 644 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 645 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 646 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 647 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
648 | else |
649 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 650 | #endif |
145a3621 | 651 | read_unlock(&neigh->lock); |
afc154e9 HFS |
652 | } else { |
653 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 654 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 655 | } |
145a3621 YH |
656 | rcu_read_unlock_bh(); |
657 | ||
a5a81f0b | 658 | return ret; |
1da177e4 LT |
659 | } |
660 | ||
554cfb7e YH |
661 | static int rt6_score_route(struct rt6_info *rt, int oif, |
662 | int strict) | |
1da177e4 | 663 | { |
a5a81f0b | 664 | int m; |
1ab1457c | 665 | |
4d0c5911 | 666 | m = rt6_check_dev(rt, oif); |
77d16f45 | 667 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 668 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
669 | #ifdef CONFIG_IPV6_ROUTER_PREF |
670 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
671 | #endif | |
afc154e9 HFS |
672 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
673 | int n = rt6_check_neigh(rt); | |
674 | if (n < 0) | |
675 | return n; | |
676 | } | |
554cfb7e YH |
677 | return m; |
678 | } | |
679 | ||
f11e6659 | 680 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
681 | int *mpri, struct rt6_info *match, |
682 | bool *do_rr) | |
554cfb7e | 683 | { |
f11e6659 | 684 | int m; |
afc154e9 | 685 | bool match_do_rr = false; |
35103d11 | 686 | struct inet6_dev *idev = rt->rt6i_idev; |
35103d11 | 687 | |
8067bb8c IS |
688 | if (rt->rt6i_nh_flags & RTNH_F_DEAD) |
689 | goto out; | |
690 | ||
14c5206c IS |
691 | if (idev->cnf.ignore_routes_with_linkdown && |
692 | rt->rt6i_nh_flags & RTNH_F_LINKDOWN && | |
d5d32e4b | 693 | !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE)) |
35103d11 | 694 | goto out; |
f11e6659 DM |
695 | |
696 | if (rt6_check_expired(rt)) | |
697 | goto out; | |
698 | ||
699 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 700 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
701 | match_do_rr = true; |
702 | m = 0; /* lowest valid score */ | |
7e980569 | 703 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 704 | goto out; |
afc154e9 HFS |
705 | } |
706 | ||
707 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
708 | rt6_probe(rt); | |
f11e6659 | 709 | |
7e980569 | 710 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 711 | if (m > *mpri) { |
afc154e9 | 712 | *do_rr = match_do_rr; |
f11e6659 DM |
713 | *mpri = m; |
714 | match = rt; | |
f11e6659 | 715 | } |
f11e6659 DM |
716 | out: |
717 | return match; | |
718 | } | |
719 | ||
720 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
8d1040e8 | 721 | struct rt6_info *leaf, |
f11e6659 | 722 | struct rt6_info *rr_head, |
afc154e9 HFS |
723 | u32 metric, int oif, int strict, |
724 | bool *do_rr) | |
f11e6659 | 725 | { |
9fbdcfaf | 726 | struct rt6_info *rt, *match, *cont; |
554cfb7e | 727 | int mpri = -1; |
1da177e4 | 728 | |
f11e6659 | 729 | match = NULL; |
9fbdcfaf | 730 | cont = NULL; |
071fb37e | 731 | for (rt = rr_head; rt; rt = rcu_dereference(rt->rt6_next)) { |
9fbdcfaf SK |
732 | if (rt->rt6i_metric != metric) { |
733 | cont = rt; | |
734 | break; | |
735 | } | |
736 | ||
737 | match = find_match(rt, oif, strict, &mpri, match, do_rr); | |
738 | } | |
739 | ||
66f5d6ce | 740 | for (rt = leaf; rt && rt != rr_head; |
071fb37e | 741 | rt = rcu_dereference(rt->rt6_next)) { |
9fbdcfaf SK |
742 | if (rt->rt6i_metric != metric) { |
743 | cont = rt; | |
744 | break; | |
745 | } | |
746 | ||
afc154e9 | 747 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
9fbdcfaf SK |
748 | } |
749 | ||
750 | if (match || !cont) | |
751 | return match; | |
752 | ||
071fb37e | 753 | for (rt = cont; rt; rt = rcu_dereference(rt->rt6_next)) |
afc154e9 | 754 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 755 | |
f11e6659 DM |
756 | return match; |
757 | } | |
1da177e4 | 758 | |
8d1040e8 WW |
759 | static struct rt6_info *rt6_select(struct net *net, struct fib6_node *fn, |
760 | int oif, int strict) | |
f11e6659 | 761 | { |
66f5d6ce | 762 | struct rt6_info *leaf = rcu_dereference(fn->leaf); |
f11e6659 | 763 | struct rt6_info *match, *rt0; |
afc154e9 | 764 | bool do_rr = false; |
17ecf590 | 765 | int key_plen; |
1da177e4 | 766 | |
87b1af8d | 767 | if (!leaf || leaf == net->ipv6.ip6_null_entry) |
8d1040e8 WW |
768 | return net->ipv6.ip6_null_entry; |
769 | ||
66f5d6ce | 770 | rt0 = rcu_dereference(fn->rr_ptr); |
f11e6659 | 771 | if (!rt0) |
66f5d6ce | 772 | rt0 = leaf; |
1da177e4 | 773 | |
17ecf590 WW |
774 | /* Double check to make sure fn is not an intermediate node |
775 | * and fn->leaf does not points to its child's leaf | |
776 | * (This might happen if all routes under fn are deleted from | |
777 | * the tree and fib6_repair_tree() is called on the node.) | |
778 | */ | |
779 | key_plen = rt0->rt6i_dst.plen; | |
780 | #ifdef CONFIG_IPV6_SUBTREES | |
781 | if (rt0->rt6i_src.plen) | |
782 | key_plen = rt0->rt6i_src.plen; | |
783 | #endif | |
784 | if (fn->fn_bit != key_plen) | |
785 | return net->ipv6.ip6_null_entry; | |
786 | ||
8d1040e8 | 787 | match = find_rr_leaf(fn, leaf, rt0, rt0->rt6i_metric, oif, strict, |
afc154e9 | 788 | &do_rr); |
1da177e4 | 789 | |
afc154e9 | 790 | if (do_rr) { |
071fb37e | 791 | struct rt6_info *next = rcu_dereference(rt0->rt6_next); |
f11e6659 | 792 | |
554cfb7e | 793 | /* no entries matched; do round-robin */ |
f11e6659 | 794 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
8d1040e8 | 795 | next = leaf; |
f11e6659 | 796 | |
66f5d6ce WW |
797 | if (next != rt0) { |
798 | spin_lock_bh(&leaf->rt6i_table->tb6_lock); | |
799 | /* make sure next is not being deleted from the tree */ | |
800 | if (next->rt6i_node) | |
801 | rcu_assign_pointer(fn->rr_ptr, next); | |
802 | spin_unlock_bh(&leaf->rt6i_table->tb6_lock); | |
803 | } | |
1da177e4 | 804 | } |
1da177e4 | 805 | |
a02cec21 | 806 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
807 | } |
808 | ||
8b9df265 MKL |
809 | static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt) |
810 | { | |
811 | return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)); | |
812 | } | |
813 | ||
70ceb4f5 YH |
814 | #ifdef CONFIG_IPV6_ROUTE_INFO |
815 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 816 | const struct in6_addr *gwaddr) |
70ceb4f5 | 817 | { |
c346dca1 | 818 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
819 | struct route_info *rinfo = (struct route_info *) opt; |
820 | struct in6_addr prefix_buf, *prefix; | |
821 | unsigned int pref; | |
4bed72e4 | 822 | unsigned long lifetime; |
70ceb4f5 YH |
823 | struct rt6_info *rt; |
824 | ||
825 | if (len < sizeof(struct route_info)) { | |
826 | return -EINVAL; | |
827 | } | |
828 | ||
829 | /* Sanity check for prefix_len and length */ | |
830 | if (rinfo->length > 3) { | |
831 | return -EINVAL; | |
832 | } else if (rinfo->prefix_len > 128) { | |
833 | return -EINVAL; | |
834 | } else if (rinfo->prefix_len > 64) { | |
835 | if (rinfo->length < 2) { | |
836 | return -EINVAL; | |
837 | } | |
838 | } else if (rinfo->prefix_len > 0) { | |
839 | if (rinfo->length < 1) { | |
840 | return -EINVAL; | |
841 | } | |
842 | } | |
843 | ||
844 | pref = rinfo->route_pref; | |
845 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 846 | return -EINVAL; |
70ceb4f5 | 847 | |
4bed72e4 | 848 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
849 | |
850 | if (rinfo->length == 3) | |
851 | prefix = (struct in6_addr *)rinfo->prefix; | |
852 | else { | |
853 | /* this function is safe */ | |
854 | ipv6_addr_prefix(&prefix_buf, | |
855 | (struct in6_addr *)rinfo->prefix, | |
856 | rinfo->prefix_len); | |
857 | prefix = &prefix_buf; | |
858 | } | |
859 | ||
f104a567 DJ |
860 | if (rinfo->prefix_len == 0) |
861 | rt = rt6_get_dflt_router(gwaddr, dev); | |
862 | else | |
863 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
830218c1 | 864 | gwaddr, dev); |
70ceb4f5 YH |
865 | |
866 | if (rt && !lifetime) { | |
e0a1ad73 | 867 | ip6_del_rt(rt); |
70ceb4f5 YH |
868 | rt = NULL; |
869 | } | |
870 | ||
871 | if (!rt && lifetime) | |
830218c1 DA |
872 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
873 | dev, pref); | |
70ceb4f5 YH |
874 | else if (rt) |
875 | rt->rt6i_flags = RTF_ROUTEINFO | | |
876 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
877 | ||
878 | if (rt) { | |
1716a961 G |
879 | if (!addrconf_finite_timeout(lifetime)) |
880 | rt6_clean_expires(rt); | |
881 | else | |
882 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
883 | ||
94e187c0 | 884 | ip6_rt_put(rt); |
70ceb4f5 YH |
885 | } |
886 | return 0; | |
887 | } | |
888 | #endif | |
889 | ||
a3c00e46 MKL |
890 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
891 | struct in6_addr *saddr) | |
892 | { | |
66f5d6ce | 893 | struct fib6_node *pn, *sn; |
a3c00e46 MKL |
894 | while (1) { |
895 | if (fn->fn_flags & RTN_TL_ROOT) | |
896 | return NULL; | |
66f5d6ce WW |
897 | pn = rcu_dereference(fn->parent); |
898 | sn = FIB6_SUBTREE(pn); | |
899 | if (sn && sn != fn) | |
900 | fn = fib6_lookup(sn, NULL, saddr); | |
a3c00e46 MKL |
901 | else |
902 | fn = pn; | |
903 | if (fn->fn_flags & RTN_RTINFO) | |
904 | return fn; | |
905 | } | |
906 | } | |
c71099ac | 907 | |
d3843fe5 WW |
908 | static bool ip6_hold_safe(struct net *net, struct rt6_info **prt, |
909 | bool null_fallback) | |
910 | { | |
911 | struct rt6_info *rt = *prt; | |
912 | ||
913 | if (dst_hold_safe(&rt->dst)) | |
914 | return true; | |
915 | if (null_fallback) { | |
916 | rt = net->ipv6.ip6_null_entry; | |
917 | dst_hold(&rt->dst); | |
918 | } else { | |
919 | rt = NULL; | |
920 | } | |
921 | *prt = rt; | |
922 | return false; | |
923 | } | |
924 | ||
8ed67789 DL |
925 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
926 | struct fib6_table *table, | |
4c9483b2 | 927 | struct flowi6 *fl6, int flags) |
1da177e4 | 928 | { |
2b760fcf | 929 | struct rt6_info *rt, *rt_cache; |
1da177e4 | 930 | struct fib6_node *fn; |
1da177e4 | 931 | |
66f5d6ce | 932 | rcu_read_lock(); |
4c9483b2 | 933 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac | 934 | restart: |
66f5d6ce WW |
935 | rt = rcu_dereference(fn->leaf); |
936 | if (!rt) { | |
937 | rt = net->ipv6.ip6_null_entry; | |
938 | } else { | |
939 | rt = rt6_device_match(net, rt, &fl6->saddr, | |
940 | fl6->flowi6_oif, flags); | |
941 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) | |
942 | rt = rt6_multipath_select(rt, fl6, | |
943 | fl6->flowi6_oif, flags); | |
944 | } | |
a3c00e46 MKL |
945 | if (rt == net->ipv6.ip6_null_entry) { |
946 | fn = fib6_backtrack(fn, &fl6->saddr); | |
947 | if (fn) | |
948 | goto restart; | |
949 | } | |
2b760fcf WW |
950 | /* Search through exception table */ |
951 | rt_cache = rt6_find_cached_rt(rt, &fl6->daddr, &fl6->saddr); | |
952 | if (rt_cache) | |
953 | rt = rt_cache; | |
954 | ||
d3843fe5 WW |
955 | if (ip6_hold_safe(net, &rt, true)) |
956 | dst_use_noref(&rt->dst, jiffies); | |
957 | ||
66f5d6ce | 958 | rcu_read_unlock(); |
b811580d | 959 | |
b65f164d | 960 | trace_fib6_table_lookup(net, rt, table, fl6); |
b811580d | 961 | |
c71099ac TG |
962 | return rt; |
963 | ||
964 | } | |
965 | ||
67ba4152 | 966 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
ea6e574e FW |
967 | int flags) |
968 | { | |
969 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
970 | } | |
971 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
972 | ||
9acd9f3a YH |
973 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
974 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 975 | { |
4c9483b2 DM |
976 | struct flowi6 fl6 = { |
977 | .flowi6_oif = oif, | |
978 | .daddr = *daddr, | |
c71099ac TG |
979 | }; |
980 | struct dst_entry *dst; | |
77d16f45 | 981 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 982 | |
adaa70bb | 983 | if (saddr) { |
4c9483b2 | 984 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
985 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
986 | } | |
987 | ||
4c9483b2 | 988 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
989 | if (dst->error == 0) |
990 | return (struct rt6_info *) dst; | |
991 | ||
992 | dst_release(dst); | |
993 | ||
1da177e4 LT |
994 | return NULL; |
995 | } | |
7159039a YH |
996 | EXPORT_SYMBOL(rt6_lookup); |
997 | ||
c71099ac | 998 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1cfb71ee WW |
999 | * It takes new route entry, the addition fails by any reason the |
1000 | * route is released. | |
1001 | * Caller must hold dst before calling it. | |
1da177e4 LT |
1002 | */ |
1003 | ||
e5fd387a | 1004 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, |
333c4301 DA |
1005 | struct mx6_config *mxc, |
1006 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
1007 | { |
1008 | int err; | |
c71099ac | 1009 | struct fib6_table *table; |
1da177e4 | 1010 | |
c71099ac | 1011 | table = rt->rt6i_table; |
66f5d6ce | 1012 | spin_lock_bh(&table->tb6_lock); |
333c4301 | 1013 | err = fib6_add(&table->tb6_root, rt, info, mxc, extack); |
66f5d6ce | 1014 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1015 | |
1016 | return err; | |
1017 | } | |
1018 | ||
40e22e8f TG |
1019 | int ip6_ins_rt(struct rt6_info *rt) |
1020 | { | |
e715b6d3 FW |
1021 | struct nl_info info = { .nl_net = dev_net(rt->dst.dev), }; |
1022 | struct mx6_config mxc = { .mx = NULL, }; | |
1023 | ||
1cfb71ee WW |
1024 | /* Hold dst to account for the reference from the fib6 tree */ |
1025 | dst_hold(&rt->dst); | |
333c4301 | 1026 | return __ip6_ins_rt(rt, &info, &mxc, NULL); |
40e22e8f TG |
1027 | } |
1028 | ||
4832c30d DA |
1029 | /* called with rcu_lock held */ |
1030 | static struct net_device *ip6_rt_get_dev_rcu(struct rt6_info *rt) | |
1031 | { | |
1032 | struct net_device *dev = rt->dst.dev; | |
1033 | ||
98d11291 | 1034 | if (rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST)) { |
4832c30d DA |
1035 | /* for copies of local routes, dst->dev needs to be the |
1036 | * device if it is a master device, the master device if | |
1037 | * device is enslaved, and the loopback as the default | |
1038 | */ | |
1039 | if (netif_is_l3_slave(dev) && | |
1040 | !rt6_need_strict(&rt->rt6i_dst.addr)) | |
1041 | dev = l3mdev_master_dev_rcu(dev); | |
1042 | else if (!netif_is_l3_master(dev)) | |
1043 | dev = dev_net(dev)->loopback_dev; | |
1044 | /* last case is netif_is_l3_master(dev) is true in which | |
1045 | * case we want dev returned to be dev | |
1046 | */ | |
1047 | } | |
1048 | ||
1049 | return dev; | |
1050 | } | |
1051 | ||
8b9df265 MKL |
1052 | static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort, |
1053 | const struct in6_addr *daddr, | |
1054 | const struct in6_addr *saddr) | |
1da177e4 | 1055 | { |
4832c30d | 1056 | struct net_device *dev; |
1da177e4 LT |
1057 | struct rt6_info *rt; |
1058 | ||
1059 | /* | |
1060 | * Clone the route. | |
1061 | */ | |
1062 | ||
d52d3997 | 1063 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) |
3a2232e9 | 1064 | ort = ort->from; |
1da177e4 | 1065 | |
4832c30d DA |
1066 | rcu_read_lock(); |
1067 | dev = ip6_rt_get_dev_rcu(ort); | |
1068 | rt = __ip6_dst_alloc(dev_net(dev), dev, 0); | |
1069 | rcu_read_unlock(); | |
83a09abd MKL |
1070 | if (!rt) |
1071 | return NULL; | |
1072 | ||
1073 | ip6_rt_copy_init(rt, ort); | |
1074 | rt->rt6i_flags |= RTF_CACHE; | |
1075 | rt->rt6i_metric = 0; | |
1076 | rt->dst.flags |= DST_HOST; | |
1077 | rt->rt6i_dst.addr = *daddr; | |
1078 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 1079 | |
83a09abd MKL |
1080 | if (!rt6_is_gw_or_nonexthop(ort)) { |
1081 | if (ort->rt6i_dst.plen != 128 && | |
1082 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
1083 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 1084 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
1085 | if (rt->rt6i_src.plen && saddr) { |
1086 | rt->rt6i_src.addr = *saddr; | |
1087 | rt->rt6i_src.plen = 128; | |
8b9df265 | 1088 | } |
83a09abd | 1089 | #endif |
95a9a5ba | 1090 | } |
1da177e4 | 1091 | |
95a9a5ba YH |
1092 | return rt; |
1093 | } | |
1da177e4 | 1094 | |
d52d3997 MKL |
1095 | static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt) |
1096 | { | |
4832c30d | 1097 | struct net_device *dev; |
d52d3997 MKL |
1098 | struct rt6_info *pcpu_rt; |
1099 | ||
4832c30d DA |
1100 | rcu_read_lock(); |
1101 | dev = ip6_rt_get_dev_rcu(rt); | |
1102 | pcpu_rt = __ip6_dst_alloc(dev_net(dev), dev, rt->dst.flags); | |
1103 | rcu_read_unlock(); | |
d52d3997 MKL |
1104 | if (!pcpu_rt) |
1105 | return NULL; | |
1106 | ip6_rt_copy_init(pcpu_rt, rt); | |
1107 | pcpu_rt->rt6i_protocol = rt->rt6i_protocol; | |
1108 | pcpu_rt->rt6i_flags |= RTF_PCPU; | |
1109 | return pcpu_rt; | |
1110 | } | |
1111 | ||
66f5d6ce | 1112 | /* It should be called with rcu_read_lock() acquired */ |
d52d3997 MKL |
1113 | static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt) |
1114 | { | |
a73e4195 | 1115 | struct rt6_info *pcpu_rt, **p; |
d52d3997 MKL |
1116 | |
1117 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1118 | pcpu_rt = *p; | |
1119 | ||
d3843fe5 | 1120 | if (pcpu_rt && ip6_hold_safe(NULL, &pcpu_rt, false)) |
a73e4195 | 1121 | rt6_dst_from_metrics_check(pcpu_rt); |
d3843fe5 | 1122 | |
a73e4195 MKL |
1123 | return pcpu_rt; |
1124 | } | |
1125 | ||
1126 | static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt) | |
1127 | { | |
1128 | struct rt6_info *pcpu_rt, *prev, **p; | |
d52d3997 MKL |
1129 | |
1130 | pcpu_rt = ip6_rt_pcpu_alloc(rt); | |
1131 | if (!pcpu_rt) { | |
1132 | struct net *net = dev_net(rt->dst.dev); | |
1133 | ||
9c7370a1 MKL |
1134 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
1135 | return net->ipv6.ip6_null_entry; | |
d52d3997 MKL |
1136 | } |
1137 | ||
a94b9367 WW |
1138 | dst_hold(&pcpu_rt->dst); |
1139 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1140 | prev = cmpxchg(p, NULL, pcpu_rt); | |
951f788a | 1141 | BUG_ON(prev); |
a94b9367 | 1142 | |
d52d3997 MKL |
1143 | rt6_dst_from_metrics_check(pcpu_rt); |
1144 | return pcpu_rt; | |
1145 | } | |
1146 | ||
35732d01 WW |
1147 | /* exception hash table implementation |
1148 | */ | |
1149 | static DEFINE_SPINLOCK(rt6_exception_lock); | |
1150 | ||
1151 | /* Remove rt6_ex from hash table and free the memory | |
1152 | * Caller must hold rt6_exception_lock | |
1153 | */ | |
1154 | static void rt6_remove_exception(struct rt6_exception_bucket *bucket, | |
1155 | struct rt6_exception *rt6_ex) | |
1156 | { | |
b2427e67 | 1157 | struct net *net; |
81eb8447 | 1158 | |
35732d01 WW |
1159 | if (!bucket || !rt6_ex) |
1160 | return; | |
b2427e67 CIK |
1161 | |
1162 | net = dev_net(rt6_ex->rt6i->dst.dev); | |
35732d01 WW |
1163 | rt6_ex->rt6i->rt6i_node = NULL; |
1164 | hlist_del_rcu(&rt6_ex->hlist); | |
1165 | rt6_release(rt6_ex->rt6i); | |
1166 | kfree_rcu(rt6_ex, rcu); | |
1167 | WARN_ON_ONCE(!bucket->depth); | |
1168 | bucket->depth--; | |
81eb8447 | 1169 | net->ipv6.rt6_stats->fib_rt_cache--; |
35732d01 WW |
1170 | } |
1171 | ||
1172 | /* Remove oldest rt6_ex in bucket and free the memory | |
1173 | * Caller must hold rt6_exception_lock | |
1174 | */ | |
1175 | static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket) | |
1176 | { | |
1177 | struct rt6_exception *rt6_ex, *oldest = NULL; | |
1178 | ||
1179 | if (!bucket) | |
1180 | return; | |
1181 | ||
1182 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1183 | if (!oldest || time_before(rt6_ex->stamp, oldest->stamp)) | |
1184 | oldest = rt6_ex; | |
1185 | } | |
1186 | rt6_remove_exception(bucket, oldest); | |
1187 | } | |
1188 | ||
1189 | static u32 rt6_exception_hash(const struct in6_addr *dst, | |
1190 | const struct in6_addr *src) | |
1191 | { | |
1192 | static u32 seed __read_mostly; | |
1193 | u32 val; | |
1194 | ||
1195 | net_get_random_once(&seed, sizeof(seed)); | |
1196 | val = jhash(dst, sizeof(*dst), seed); | |
1197 | ||
1198 | #ifdef CONFIG_IPV6_SUBTREES | |
1199 | if (src) | |
1200 | val = jhash(src, sizeof(*src), val); | |
1201 | #endif | |
1202 | return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT); | |
1203 | } | |
1204 | ||
1205 | /* Helper function to find the cached rt in the hash table | |
1206 | * and update bucket pointer to point to the bucket for this | |
1207 | * (daddr, saddr) pair | |
1208 | * Caller must hold rt6_exception_lock | |
1209 | */ | |
1210 | static struct rt6_exception * | |
1211 | __rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket, | |
1212 | const struct in6_addr *daddr, | |
1213 | const struct in6_addr *saddr) | |
1214 | { | |
1215 | struct rt6_exception *rt6_ex; | |
1216 | u32 hval; | |
1217 | ||
1218 | if (!(*bucket) || !daddr) | |
1219 | return NULL; | |
1220 | ||
1221 | hval = rt6_exception_hash(daddr, saddr); | |
1222 | *bucket += hval; | |
1223 | ||
1224 | hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) { | |
1225 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1226 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1227 | ||
1228 | #ifdef CONFIG_IPV6_SUBTREES | |
1229 | if (matched && saddr) | |
1230 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1231 | #endif | |
1232 | if (matched) | |
1233 | return rt6_ex; | |
1234 | } | |
1235 | return NULL; | |
1236 | } | |
1237 | ||
1238 | /* Helper function to find the cached rt in the hash table | |
1239 | * and update bucket pointer to point to the bucket for this | |
1240 | * (daddr, saddr) pair | |
1241 | * Caller must hold rcu_read_lock() | |
1242 | */ | |
1243 | static struct rt6_exception * | |
1244 | __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket, | |
1245 | const struct in6_addr *daddr, | |
1246 | const struct in6_addr *saddr) | |
1247 | { | |
1248 | struct rt6_exception *rt6_ex; | |
1249 | u32 hval; | |
1250 | ||
1251 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1252 | ||
1253 | if (!(*bucket) || !daddr) | |
1254 | return NULL; | |
1255 | ||
1256 | hval = rt6_exception_hash(daddr, saddr); | |
1257 | *bucket += hval; | |
1258 | ||
1259 | hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) { | |
1260 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1261 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1262 | ||
1263 | #ifdef CONFIG_IPV6_SUBTREES | |
1264 | if (matched && saddr) | |
1265 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1266 | #endif | |
1267 | if (matched) | |
1268 | return rt6_ex; | |
1269 | } | |
1270 | return NULL; | |
1271 | } | |
1272 | ||
1273 | static int rt6_insert_exception(struct rt6_info *nrt, | |
1274 | struct rt6_info *ort) | |
1275 | { | |
81eb8447 | 1276 | struct net *net = dev_net(ort->dst.dev); |
35732d01 WW |
1277 | struct rt6_exception_bucket *bucket; |
1278 | struct in6_addr *src_key = NULL; | |
1279 | struct rt6_exception *rt6_ex; | |
1280 | int err = 0; | |
1281 | ||
1282 | /* ort can't be a cache or pcpu route */ | |
1283 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) | |
3a2232e9 | 1284 | ort = ort->from; |
35732d01 WW |
1285 | WARN_ON_ONCE(ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)); |
1286 | ||
1287 | spin_lock_bh(&rt6_exception_lock); | |
1288 | ||
1289 | if (ort->exception_bucket_flushed) { | |
1290 | err = -EINVAL; | |
1291 | goto out; | |
1292 | } | |
1293 | ||
1294 | bucket = rcu_dereference_protected(ort->rt6i_exception_bucket, | |
1295 | lockdep_is_held(&rt6_exception_lock)); | |
1296 | if (!bucket) { | |
1297 | bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket), | |
1298 | GFP_ATOMIC); | |
1299 | if (!bucket) { | |
1300 | err = -ENOMEM; | |
1301 | goto out; | |
1302 | } | |
1303 | rcu_assign_pointer(ort->rt6i_exception_bucket, bucket); | |
1304 | } | |
1305 | ||
1306 | #ifdef CONFIG_IPV6_SUBTREES | |
1307 | /* rt6i_src.plen != 0 indicates ort is in subtree | |
1308 | * and exception table is indexed by a hash of | |
1309 | * both rt6i_dst and rt6i_src. | |
1310 | * Otherwise, the exception table is indexed by | |
1311 | * a hash of only rt6i_dst. | |
1312 | */ | |
1313 | if (ort->rt6i_src.plen) | |
1314 | src_key = &nrt->rt6i_src.addr; | |
1315 | #endif | |
60006a48 WW |
1316 | |
1317 | /* Update rt6i_prefsrc as it could be changed | |
1318 | * in rt6_remove_prefsrc() | |
1319 | */ | |
1320 | nrt->rt6i_prefsrc = ort->rt6i_prefsrc; | |
f5bbe7ee WW |
1321 | /* rt6_mtu_change() might lower mtu on ort. |
1322 | * Only insert this exception route if its mtu | |
1323 | * is less than ort's mtu value. | |
1324 | */ | |
1325 | if (nrt->rt6i_pmtu >= dst_mtu(&ort->dst)) { | |
1326 | err = -EINVAL; | |
1327 | goto out; | |
1328 | } | |
60006a48 | 1329 | |
35732d01 WW |
1330 | rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr, |
1331 | src_key); | |
1332 | if (rt6_ex) | |
1333 | rt6_remove_exception(bucket, rt6_ex); | |
1334 | ||
1335 | rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC); | |
1336 | if (!rt6_ex) { | |
1337 | err = -ENOMEM; | |
1338 | goto out; | |
1339 | } | |
1340 | rt6_ex->rt6i = nrt; | |
1341 | rt6_ex->stamp = jiffies; | |
1342 | atomic_inc(&nrt->rt6i_ref); | |
1343 | nrt->rt6i_node = ort->rt6i_node; | |
1344 | hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain); | |
1345 | bucket->depth++; | |
81eb8447 | 1346 | net->ipv6.rt6_stats->fib_rt_cache++; |
35732d01 WW |
1347 | |
1348 | if (bucket->depth > FIB6_MAX_DEPTH) | |
1349 | rt6_exception_remove_oldest(bucket); | |
1350 | ||
1351 | out: | |
1352 | spin_unlock_bh(&rt6_exception_lock); | |
1353 | ||
1354 | /* Update fn->fn_sernum to invalidate all cached dst */ | |
b886d5f2 | 1355 | if (!err) { |
922c2ac8 | 1356 | spin_lock_bh(&ort->rt6i_table->tb6_lock); |
35732d01 | 1357 | fib6_update_sernum(ort); |
922c2ac8 | 1358 | spin_unlock_bh(&ort->rt6i_table->tb6_lock); |
b886d5f2 PA |
1359 | fib6_force_start_gc(net); |
1360 | } | |
35732d01 WW |
1361 | |
1362 | return err; | |
1363 | } | |
1364 | ||
1365 | void rt6_flush_exceptions(struct rt6_info *rt) | |
1366 | { | |
1367 | struct rt6_exception_bucket *bucket; | |
1368 | struct rt6_exception *rt6_ex; | |
1369 | struct hlist_node *tmp; | |
1370 | int i; | |
1371 | ||
1372 | spin_lock_bh(&rt6_exception_lock); | |
1373 | /* Prevent rt6_insert_exception() to recreate the bucket list */ | |
1374 | rt->exception_bucket_flushed = 1; | |
1375 | ||
1376 | bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, | |
1377 | lockdep_is_held(&rt6_exception_lock)); | |
1378 | if (!bucket) | |
1379 | goto out; | |
1380 | ||
1381 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1382 | hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) | |
1383 | rt6_remove_exception(bucket, rt6_ex); | |
1384 | WARN_ON_ONCE(bucket->depth); | |
1385 | bucket++; | |
1386 | } | |
1387 | ||
1388 | out: | |
1389 | spin_unlock_bh(&rt6_exception_lock); | |
1390 | } | |
1391 | ||
1392 | /* Find cached rt in the hash table inside passed in rt | |
1393 | * Caller has to hold rcu_read_lock() | |
1394 | */ | |
1395 | static struct rt6_info *rt6_find_cached_rt(struct rt6_info *rt, | |
1396 | struct in6_addr *daddr, | |
1397 | struct in6_addr *saddr) | |
1398 | { | |
1399 | struct rt6_exception_bucket *bucket; | |
1400 | struct in6_addr *src_key = NULL; | |
1401 | struct rt6_exception *rt6_ex; | |
1402 | struct rt6_info *res = NULL; | |
1403 | ||
1404 | bucket = rcu_dereference(rt->rt6i_exception_bucket); | |
1405 | ||
1406 | #ifdef CONFIG_IPV6_SUBTREES | |
1407 | /* rt6i_src.plen != 0 indicates rt is in subtree | |
1408 | * and exception table is indexed by a hash of | |
1409 | * both rt6i_dst and rt6i_src. | |
1410 | * Otherwise, the exception table is indexed by | |
1411 | * a hash of only rt6i_dst. | |
1412 | */ | |
1413 | if (rt->rt6i_src.plen) | |
1414 | src_key = saddr; | |
1415 | #endif | |
1416 | rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key); | |
1417 | ||
1418 | if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i)) | |
1419 | res = rt6_ex->rt6i; | |
1420 | ||
1421 | return res; | |
1422 | } | |
1423 | ||
1424 | /* Remove the passed in cached rt from the hash table that contains it */ | |
1425 | int rt6_remove_exception_rt(struct rt6_info *rt) | |
1426 | { | |
35732d01 | 1427 | struct rt6_exception_bucket *bucket; |
3a2232e9 | 1428 | struct rt6_info *from = rt->from; |
35732d01 WW |
1429 | struct in6_addr *src_key = NULL; |
1430 | struct rt6_exception *rt6_ex; | |
1431 | int err; | |
1432 | ||
1433 | if (!from || | |
442d713b | 1434 | !(rt->rt6i_flags & RTF_CACHE)) |
35732d01 WW |
1435 | return -EINVAL; |
1436 | ||
1437 | if (!rcu_access_pointer(from->rt6i_exception_bucket)) | |
1438 | return -ENOENT; | |
1439 | ||
1440 | spin_lock_bh(&rt6_exception_lock); | |
1441 | bucket = rcu_dereference_protected(from->rt6i_exception_bucket, | |
1442 | lockdep_is_held(&rt6_exception_lock)); | |
1443 | #ifdef CONFIG_IPV6_SUBTREES | |
1444 | /* rt6i_src.plen != 0 indicates 'from' is in subtree | |
1445 | * and exception table is indexed by a hash of | |
1446 | * both rt6i_dst and rt6i_src. | |
1447 | * Otherwise, the exception table is indexed by | |
1448 | * a hash of only rt6i_dst. | |
1449 | */ | |
1450 | if (from->rt6i_src.plen) | |
1451 | src_key = &rt->rt6i_src.addr; | |
1452 | #endif | |
1453 | rt6_ex = __rt6_find_exception_spinlock(&bucket, | |
1454 | &rt->rt6i_dst.addr, | |
1455 | src_key); | |
1456 | if (rt6_ex) { | |
1457 | rt6_remove_exception(bucket, rt6_ex); | |
1458 | err = 0; | |
1459 | } else { | |
1460 | err = -ENOENT; | |
1461 | } | |
1462 | ||
1463 | spin_unlock_bh(&rt6_exception_lock); | |
1464 | return err; | |
1465 | } | |
1466 | ||
1467 | /* Find rt6_ex which contains the passed in rt cache and | |
1468 | * refresh its stamp | |
1469 | */ | |
1470 | static void rt6_update_exception_stamp_rt(struct rt6_info *rt) | |
1471 | { | |
35732d01 | 1472 | struct rt6_exception_bucket *bucket; |
3a2232e9 | 1473 | struct rt6_info *from = rt->from; |
35732d01 WW |
1474 | struct in6_addr *src_key = NULL; |
1475 | struct rt6_exception *rt6_ex; | |
1476 | ||
1477 | if (!from || | |
442d713b | 1478 | !(rt->rt6i_flags & RTF_CACHE)) |
35732d01 WW |
1479 | return; |
1480 | ||
1481 | rcu_read_lock(); | |
1482 | bucket = rcu_dereference(from->rt6i_exception_bucket); | |
1483 | ||
1484 | #ifdef CONFIG_IPV6_SUBTREES | |
1485 | /* rt6i_src.plen != 0 indicates 'from' is in subtree | |
1486 | * and exception table is indexed by a hash of | |
1487 | * both rt6i_dst and rt6i_src. | |
1488 | * Otherwise, the exception table is indexed by | |
1489 | * a hash of only rt6i_dst. | |
1490 | */ | |
1491 | if (from->rt6i_src.plen) | |
1492 | src_key = &rt->rt6i_src.addr; | |
1493 | #endif | |
1494 | rt6_ex = __rt6_find_exception_rcu(&bucket, | |
1495 | &rt->rt6i_dst.addr, | |
1496 | src_key); | |
1497 | if (rt6_ex) | |
1498 | rt6_ex->stamp = jiffies; | |
1499 | ||
1500 | rcu_read_unlock(); | |
1501 | } | |
1502 | ||
60006a48 WW |
1503 | static void rt6_exceptions_remove_prefsrc(struct rt6_info *rt) |
1504 | { | |
1505 | struct rt6_exception_bucket *bucket; | |
1506 | struct rt6_exception *rt6_ex; | |
1507 | int i; | |
1508 | ||
1509 | bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, | |
1510 | lockdep_is_held(&rt6_exception_lock)); | |
1511 | ||
1512 | if (bucket) { | |
1513 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1514 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1515 | rt6_ex->rt6i->rt6i_prefsrc.plen = 0; | |
1516 | } | |
1517 | bucket++; | |
1518 | } | |
1519 | } | |
1520 | } | |
1521 | ||
f5bbe7ee WW |
1522 | static void rt6_exceptions_update_pmtu(struct rt6_info *rt, int mtu) |
1523 | { | |
1524 | struct rt6_exception_bucket *bucket; | |
1525 | struct rt6_exception *rt6_ex; | |
1526 | int i; | |
1527 | ||
1528 | bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, | |
1529 | lockdep_is_held(&rt6_exception_lock)); | |
1530 | ||
1531 | if (bucket) { | |
1532 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1533 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1534 | struct rt6_info *entry = rt6_ex->rt6i; | |
1535 | /* For RTF_CACHE with rt6i_pmtu == 0 | |
1536 | * (i.e. a redirected route), | |
1537 | * the metrics of its rt->dst.from has already | |
1538 | * been updated. | |
1539 | */ | |
1540 | if (entry->rt6i_pmtu && entry->rt6i_pmtu > mtu) | |
1541 | entry->rt6i_pmtu = mtu; | |
1542 | } | |
1543 | bucket++; | |
1544 | } | |
1545 | } | |
1546 | } | |
1547 | ||
b16cb459 WW |
1548 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) |
1549 | ||
1550 | static void rt6_exceptions_clean_tohost(struct rt6_info *rt, | |
1551 | struct in6_addr *gateway) | |
1552 | { | |
1553 | struct rt6_exception_bucket *bucket; | |
1554 | struct rt6_exception *rt6_ex; | |
1555 | struct hlist_node *tmp; | |
1556 | int i; | |
1557 | ||
1558 | if (!rcu_access_pointer(rt->rt6i_exception_bucket)) | |
1559 | return; | |
1560 | ||
1561 | spin_lock_bh(&rt6_exception_lock); | |
1562 | bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, | |
1563 | lockdep_is_held(&rt6_exception_lock)); | |
1564 | ||
1565 | if (bucket) { | |
1566 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1567 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
1568 | &bucket->chain, hlist) { | |
1569 | struct rt6_info *entry = rt6_ex->rt6i; | |
1570 | ||
1571 | if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) == | |
1572 | RTF_CACHE_GATEWAY && | |
1573 | ipv6_addr_equal(gateway, | |
1574 | &entry->rt6i_gateway)) { | |
1575 | rt6_remove_exception(bucket, rt6_ex); | |
1576 | } | |
1577 | } | |
1578 | bucket++; | |
1579 | } | |
1580 | } | |
1581 | ||
1582 | spin_unlock_bh(&rt6_exception_lock); | |
1583 | } | |
1584 | ||
c757faa8 WW |
1585 | static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket, |
1586 | struct rt6_exception *rt6_ex, | |
1587 | struct fib6_gc_args *gc_args, | |
1588 | unsigned long now) | |
1589 | { | |
1590 | struct rt6_info *rt = rt6_ex->rt6i; | |
1591 | ||
1859bac0 PA |
1592 | /* we are pruning and obsoleting aged-out and non gateway exceptions |
1593 | * even if others have still references to them, so that on next | |
1594 | * dst_check() such references can be dropped. | |
1595 | * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when | |
1596 | * expired, independently from their aging, as per RFC 8201 section 4 | |
1597 | */ | |
1598 | if (!(rt->rt6i_flags & RTF_EXPIRES) && | |
c757faa8 WW |
1599 | time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) { |
1600 | RT6_TRACE("aging clone %p\n", rt); | |
1601 | rt6_remove_exception(bucket, rt6_ex); | |
1602 | return; | |
1603 | } else if (rt->rt6i_flags & RTF_GATEWAY) { | |
1604 | struct neighbour *neigh; | |
1605 | __u8 neigh_flags = 0; | |
1606 | ||
1607 | neigh = dst_neigh_lookup(&rt->dst, &rt->rt6i_gateway); | |
1608 | if (neigh) { | |
1609 | neigh_flags = neigh->flags; | |
1610 | neigh_release(neigh); | |
1611 | } | |
1612 | if (!(neigh_flags & NTF_ROUTER)) { | |
1613 | RT6_TRACE("purging route %p via non-router but gateway\n", | |
1614 | rt); | |
1615 | rt6_remove_exception(bucket, rt6_ex); | |
1616 | return; | |
1617 | } | |
1859bac0 PA |
1618 | } else if (__rt6_check_expired(rt)) { |
1619 | RT6_TRACE("purging expired route %p\n", rt); | |
1620 | rt6_remove_exception(bucket, rt6_ex); | |
1621 | return; | |
c757faa8 WW |
1622 | } |
1623 | gc_args->more++; | |
1624 | } | |
1625 | ||
1626 | void rt6_age_exceptions(struct rt6_info *rt, | |
1627 | struct fib6_gc_args *gc_args, | |
1628 | unsigned long now) | |
1629 | { | |
1630 | struct rt6_exception_bucket *bucket; | |
1631 | struct rt6_exception *rt6_ex; | |
1632 | struct hlist_node *tmp; | |
1633 | int i; | |
1634 | ||
1635 | if (!rcu_access_pointer(rt->rt6i_exception_bucket)) | |
1636 | return; | |
1637 | ||
1638 | spin_lock_bh(&rt6_exception_lock); | |
1639 | bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, | |
1640 | lockdep_is_held(&rt6_exception_lock)); | |
1641 | ||
1642 | if (bucket) { | |
1643 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
1644 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
1645 | &bucket->chain, hlist) { | |
1646 | rt6_age_examine_exception(bucket, rt6_ex, | |
1647 | gc_args, now); | |
1648 | } | |
1649 | bucket++; | |
1650 | } | |
1651 | } | |
1652 | spin_unlock_bh(&rt6_exception_lock); | |
1653 | } | |
1654 | ||
9ff74384 DA |
1655 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, |
1656 | int oif, struct flowi6 *fl6, int flags) | |
1da177e4 | 1657 | { |
367efcb9 | 1658 | struct fib6_node *fn, *saved_fn; |
2b760fcf | 1659 | struct rt6_info *rt, *rt_cache; |
c71099ac | 1660 | int strict = 0; |
1da177e4 | 1661 | |
77d16f45 | 1662 | strict |= flags & RT6_LOOKUP_F_IFACE; |
d5d32e4b | 1663 | strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE; |
367efcb9 MKL |
1664 | if (net->ipv6.devconf_all->forwarding == 0) |
1665 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1da177e4 | 1666 | |
66f5d6ce | 1667 | rcu_read_lock(); |
1da177e4 | 1668 | |
4c9483b2 | 1669 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 1670 | saved_fn = fn; |
1da177e4 | 1671 | |
ca254490 DA |
1672 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1673 | oif = 0; | |
1674 | ||
a3c00e46 | 1675 | redo_rt6_select: |
8d1040e8 | 1676 | rt = rt6_select(net, fn, oif, strict); |
52bd4c0c | 1677 | if (rt->rt6i_nsiblings) |
367efcb9 | 1678 | rt = rt6_multipath_select(rt, fl6, oif, strict); |
a3c00e46 MKL |
1679 | if (rt == net->ipv6.ip6_null_entry) { |
1680 | fn = fib6_backtrack(fn, &fl6->saddr); | |
1681 | if (fn) | |
1682 | goto redo_rt6_select; | |
367efcb9 MKL |
1683 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
1684 | /* also consider unreachable route */ | |
1685 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
1686 | fn = saved_fn; | |
1687 | goto redo_rt6_select; | |
367efcb9 | 1688 | } |
a3c00e46 MKL |
1689 | } |
1690 | ||
2b760fcf WW |
1691 | /*Search through exception table */ |
1692 | rt_cache = rt6_find_cached_rt(rt, &fl6->daddr, &fl6->saddr); | |
1693 | if (rt_cache) | |
1694 | rt = rt_cache; | |
fb9de91e | 1695 | |
d3843fe5 | 1696 | if (rt == net->ipv6.ip6_null_entry) { |
66f5d6ce | 1697 | rcu_read_unlock(); |
d3843fe5 | 1698 | dst_hold(&rt->dst); |
b65f164d | 1699 | trace_fib6_table_lookup(net, rt, table, fl6); |
d3843fe5 WW |
1700 | return rt; |
1701 | } else if (rt->rt6i_flags & RTF_CACHE) { | |
1702 | if (ip6_hold_safe(net, &rt, true)) { | |
1703 | dst_use_noref(&rt->dst, jiffies); | |
1704 | rt6_dst_from_metrics_check(rt); | |
1705 | } | |
66f5d6ce | 1706 | rcu_read_unlock(); |
b65f164d | 1707 | trace_fib6_table_lookup(net, rt, table, fl6); |
d52d3997 | 1708 | return rt; |
3da59bd9 MKL |
1709 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
1710 | !(rt->rt6i_flags & RTF_GATEWAY))) { | |
1711 | /* Create a RTF_CACHE clone which will not be | |
1712 | * owned by the fib6 tree. It is for the special case where | |
1713 | * the daddr in the skb during the neighbor look-up is different | |
1714 | * from the fl6->daddr used to look-up route here. | |
1715 | */ | |
1716 | ||
1717 | struct rt6_info *uncached_rt; | |
1718 | ||
d3843fe5 WW |
1719 | if (ip6_hold_safe(net, &rt, true)) { |
1720 | dst_use_noref(&rt->dst, jiffies); | |
1721 | } else { | |
66f5d6ce | 1722 | rcu_read_unlock(); |
d3843fe5 WW |
1723 | uncached_rt = rt; |
1724 | goto uncached_rt_out; | |
1725 | } | |
66f5d6ce | 1726 | rcu_read_unlock(); |
d52d3997 | 1727 | |
3da59bd9 MKL |
1728 | uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL); |
1729 | dst_release(&rt->dst); | |
c71099ac | 1730 | |
1cfb71ee WW |
1731 | if (uncached_rt) { |
1732 | /* Uncached_rt's refcnt is taken during ip6_rt_cache_alloc() | |
1733 | * No need for another dst_hold() | |
1734 | */ | |
8d0b94af | 1735 | rt6_uncached_list_add(uncached_rt); |
81eb8447 | 1736 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
1cfb71ee | 1737 | } else { |
3da59bd9 | 1738 | uncached_rt = net->ipv6.ip6_null_entry; |
1cfb71ee WW |
1739 | dst_hold(&uncached_rt->dst); |
1740 | } | |
b811580d | 1741 | |
d3843fe5 | 1742 | uncached_rt_out: |
b65f164d | 1743 | trace_fib6_table_lookup(net, uncached_rt, table, fl6); |
3da59bd9 | 1744 | return uncached_rt; |
3da59bd9 | 1745 | |
d52d3997 MKL |
1746 | } else { |
1747 | /* Get a percpu copy */ | |
1748 | ||
1749 | struct rt6_info *pcpu_rt; | |
1750 | ||
d3843fe5 | 1751 | dst_use_noref(&rt->dst, jiffies); |
951f788a | 1752 | local_bh_disable(); |
d52d3997 | 1753 | pcpu_rt = rt6_get_pcpu_route(rt); |
d52d3997 | 1754 | |
951f788a | 1755 | if (!pcpu_rt) { |
a94b9367 WW |
1756 | /* atomic_inc_not_zero() is needed when using rcu */ |
1757 | if (atomic_inc_not_zero(&rt->rt6i_ref)) { | |
951f788a | 1758 | /* No dst_hold() on rt is needed because grabbing |
a94b9367 WW |
1759 | * rt->rt6i_ref makes sure rt can't be released. |
1760 | */ | |
a94b9367 WW |
1761 | pcpu_rt = rt6_make_pcpu_route(rt); |
1762 | rt6_release(rt); | |
1763 | } else { | |
1764 | /* rt is already removed from tree */ | |
a94b9367 WW |
1765 | pcpu_rt = net->ipv6.ip6_null_entry; |
1766 | dst_hold(&pcpu_rt->dst); | |
1767 | } | |
9c7370a1 | 1768 | } |
951f788a ED |
1769 | local_bh_enable(); |
1770 | rcu_read_unlock(); | |
b65f164d | 1771 | trace_fib6_table_lookup(net, pcpu_rt, table, fl6); |
d52d3997 MKL |
1772 | return pcpu_rt; |
1773 | } | |
1da177e4 | 1774 | } |
9ff74384 | 1775 | EXPORT_SYMBOL_GPL(ip6_pol_route); |
1da177e4 | 1776 | |
8ed67789 | 1777 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 1778 | struct flowi6 *fl6, int flags) |
4acad72d | 1779 | { |
4c9483b2 | 1780 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
1781 | } |
1782 | ||
d409b847 MB |
1783 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
1784 | struct net_device *dev, | |
1785 | struct flowi6 *fl6, int flags) | |
72331bc0 SL |
1786 | { |
1787 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1788 | flags |= RT6_LOOKUP_F_IFACE; | |
1789 | ||
1790 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1791 | } | |
d409b847 | 1792 | EXPORT_SYMBOL_GPL(ip6_route_input_lookup); |
72331bc0 | 1793 | |
23aebdac JS |
1794 | static void ip6_multipath_l3_keys(const struct sk_buff *skb, |
1795 | struct flow_keys *keys) | |
1796 | { | |
1797 | const struct ipv6hdr *outer_iph = ipv6_hdr(skb); | |
1798 | const struct ipv6hdr *key_iph = outer_iph; | |
1799 | const struct ipv6hdr *inner_iph; | |
1800 | const struct icmp6hdr *icmph; | |
1801 | struct ipv6hdr _inner_iph; | |
1802 | ||
1803 | if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6)) | |
1804 | goto out; | |
1805 | ||
1806 | icmph = icmp6_hdr(skb); | |
1807 | if (icmph->icmp6_type != ICMPV6_DEST_UNREACH && | |
1808 | icmph->icmp6_type != ICMPV6_PKT_TOOBIG && | |
1809 | icmph->icmp6_type != ICMPV6_TIME_EXCEED && | |
1810 | icmph->icmp6_type != ICMPV6_PARAMPROB) | |
1811 | goto out; | |
1812 | ||
1813 | inner_iph = skb_header_pointer(skb, | |
1814 | skb_transport_offset(skb) + sizeof(*icmph), | |
1815 | sizeof(_inner_iph), &_inner_iph); | |
1816 | if (!inner_iph) | |
1817 | goto out; | |
1818 | ||
1819 | key_iph = inner_iph; | |
1820 | out: | |
1821 | memset(keys, 0, sizeof(*keys)); | |
1822 | keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
1823 | keys->addrs.v6addrs.src = key_iph->saddr; | |
1824 | keys->addrs.v6addrs.dst = key_iph->daddr; | |
1825 | keys->tags.flow_label = ip6_flowinfo(key_iph); | |
1826 | keys->basic.ip_proto = key_iph->nexthdr; | |
1827 | } | |
1828 | ||
1829 | /* if skb is set it will be used and fl6 can be NULL */ | |
1830 | u32 rt6_multipath_hash(const struct flowi6 *fl6, const struct sk_buff *skb) | |
1831 | { | |
1832 | struct flow_keys hash_keys; | |
1833 | ||
1834 | if (skb) { | |
1835 | ip6_multipath_l3_keys(skb, &hash_keys); | |
7696c06a | 1836 | return flow_hash_from_keys(&hash_keys) >> 1; |
23aebdac JS |
1837 | } |
1838 | ||
7696c06a | 1839 | return get_hash_from_flowi6(fl6) >> 1; |
23aebdac JS |
1840 | } |
1841 | ||
c71099ac TG |
1842 | void ip6_route_input(struct sk_buff *skb) |
1843 | { | |
b71d1d42 | 1844 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1845 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1846 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
904af04d | 1847 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 1848 | struct flowi6 fl6 = { |
e0d56fdd | 1849 | .flowi6_iif = skb->dev->ifindex, |
4c9483b2 DM |
1850 | .daddr = iph->daddr, |
1851 | .saddr = iph->saddr, | |
6502ca52 | 1852 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1853 | .flowi6_mark = skb->mark, |
1854 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1855 | }; |
adaa70bb | 1856 | |
904af04d | 1857 | tun_info = skb_tunnel_info(skb); |
46fa062a | 1858 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 1859 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
23aebdac JS |
1860 | if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6)) |
1861 | fl6.mp_hash = rt6_multipath_hash(&fl6, skb); | |
06e9d040 | 1862 | skb_dst_drop(skb); |
72331bc0 | 1863 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1864 | } |
1865 | ||
8ed67789 | 1866 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1867 | struct flowi6 *fl6, int flags) |
1da177e4 | 1868 | { |
4c9483b2 | 1869 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1870 | } |
1871 | ||
6f21c96a PA |
1872 | struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, |
1873 | struct flowi6 *fl6, int flags) | |
c71099ac | 1874 | { |
d46a9d67 | 1875 | bool any_src; |
c71099ac | 1876 | |
4c1feac5 DA |
1877 | if (rt6_need_strict(&fl6->daddr)) { |
1878 | struct dst_entry *dst; | |
1879 | ||
1880 | dst = l3mdev_link_scope_lookup(net, fl6); | |
1881 | if (dst) | |
1882 | return dst; | |
1883 | } | |
ca254490 | 1884 | |
1fb9489b | 1885 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1886 | |
d46a9d67 | 1887 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 1888 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 1889 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 1890 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1891 | |
d46a9d67 | 1892 | if (!any_src) |
adaa70bb | 1893 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1894 | else if (sk) |
1895 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1896 | |
4c9483b2 | 1897 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 | 1898 | } |
6f21c96a | 1899 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 1900 | |
2774c131 | 1901 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1902 | { |
5c1e6aa3 | 1903 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
1dbe3252 | 1904 | struct net_device *loopback_dev = net->loopback_dev; |
14e50e57 DM |
1905 | struct dst_entry *new = NULL; |
1906 | ||
1dbe3252 | 1907 | rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1, |
62cf27e5 | 1908 | DST_OBSOLETE_DEAD, 0); |
14e50e57 | 1909 | if (rt) { |
0a1f5962 | 1910 | rt6_info_init(rt); |
81eb8447 | 1911 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
8104891b | 1912 | |
0a1f5962 | 1913 | new = &rt->dst; |
14e50e57 | 1914 | new->__use = 1; |
352e512c | 1915 | new->input = dst_discard; |
ede2059d | 1916 | new->output = dst_discard_out; |
14e50e57 | 1917 | |
0a1f5962 | 1918 | dst_copy_metrics(new, &ort->dst); |
14e50e57 | 1919 | |
1dbe3252 | 1920 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
4e3fd7a0 | 1921 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 1922 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
1923 | rt->rt6i_metric = 0; |
1924 | ||
1925 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1926 | #ifdef CONFIG_IPV6_SUBTREES | |
1927 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1928 | #endif | |
14e50e57 DM |
1929 | } |
1930 | ||
69ead7af DM |
1931 | dst_release(dst_orig); |
1932 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1933 | } |
14e50e57 | 1934 | |
1da177e4 LT |
1935 | /* |
1936 | * Destination cache support functions | |
1937 | */ | |
1938 | ||
4b32b5ad MKL |
1939 | static void rt6_dst_from_metrics_check(struct rt6_info *rt) |
1940 | { | |
3a2232e9 DM |
1941 | if (rt->from && |
1942 | dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(&rt->from->dst)) | |
1943 | dst_init_metrics(&rt->dst, dst_metrics_ptr(&rt->from->dst), true); | |
4b32b5ad MKL |
1944 | } |
1945 | ||
3da59bd9 MKL |
1946 | static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie) |
1947 | { | |
36143645 | 1948 | u32 rt_cookie = 0; |
c5cff856 WW |
1949 | |
1950 | if (!rt6_get_cookie_safe(rt, &rt_cookie) || rt_cookie != cookie) | |
3da59bd9 MKL |
1951 | return NULL; |
1952 | ||
1953 | if (rt6_check_expired(rt)) | |
1954 | return NULL; | |
1955 | ||
1956 | return &rt->dst; | |
1957 | } | |
1958 | ||
1959 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie) | |
1960 | { | |
5973fb1e MKL |
1961 | if (!__rt6_check_expired(rt) && |
1962 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
3a2232e9 | 1963 | rt6_check(rt->from, cookie)) |
3da59bd9 MKL |
1964 | return &rt->dst; |
1965 | else | |
1966 | return NULL; | |
1967 | } | |
1968 | ||
1da177e4 LT |
1969 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
1970 | { | |
1971 | struct rt6_info *rt; | |
1972 | ||
1973 | rt = (struct rt6_info *) dst; | |
1974 | ||
6f3118b5 ND |
1975 | /* All IPV6 dsts are created with ->obsolete set to the value |
1976 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1977 | * into this function always. | |
1978 | */ | |
e3bc10bd | 1979 | |
4b32b5ad MKL |
1980 | rt6_dst_from_metrics_check(rt); |
1981 | ||
02bcf4e0 | 1982 | if (rt->rt6i_flags & RTF_PCPU || |
3a2232e9 | 1983 | (unlikely(!list_empty(&rt->rt6i_uncached)) && rt->from)) |
3da59bd9 MKL |
1984 | return rt6_dst_from_check(rt, cookie); |
1985 | else | |
1986 | return rt6_check(rt, cookie); | |
1da177e4 LT |
1987 | } |
1988 | ||
1989 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1990 | { | |
1991 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1992 | ||
1993 | if (rt) { | |
54c1a859 YH |
1994 | if (rt->rt6i_flags & RTF_CACHE) { |
1995 | if (rt6_check_expired(rt)) { | |
1996 | ip6_del_rt(rt); | |
1997 | dst = NULL; | |
1998 | } | |
1999 | } else { | |
1da177e4 | 2000 | dst_release(dst); |
54c1a859 YH |
2001 | dst = NULL; |
2002 | } | |
1da177e4 | 2003 | } |
54c1a859 | 2004 | return dst; |
1da177e4 LT |
2005 | } |
2006 | ||
2007 | static void ip6_link_failure(struct sk_buff *skb) | |
2008 | { | |
2009 | struct rt6_info *rt; | |
2010 | ||
3ffe533c | 2011 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 2012 | |
adf30907 | 2013 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 2014 | if (rt) { |
1eb4f758 | 2015 | if (rt->rt6i_flags & RTF_CACHE) { |
ad65a2f0 WW |
2016 | if (dst_hold_safe(&rt->dst)) |
2017 | ip6_del_rt(rt); | |
c5cff856 WW |
2018 | } else { |
2019 | struct fib6_node *fn; | |
2020 | ||
2021 | rcu_read_lock(); | |
2022 | fn = rcu_dereference(rt->rt6i_node); | |
2023 | if (fn && (rt->rt6i_flags & RTF_DEFAULT)) | |
2024 | fn->fn_sernum = -1; | |
2025 | rcu_read_unlock(); | |
1eb4f758 | 2026 | } |
1da177e4 LT |
2027 | } |
2028 | } | |
2029 | ||
45e4fd26 MKL |
2030 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
2031 | { | |
2032 | struct net *net = dev_net(rt->dst.dev); | |
2033 | ||
2034 | rt->rt6i_flags |= RTF_MODIFIED; | |
2035 | rt->rt6i_pmtu = mtu; | |
2036 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
2037 | } | |
2038 | ||
0d3f6d29 MKL |
2039 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
2040 | { | |
2041 | return !(rt->rt6i_flags & RTF_CACHE) && | |
4e587ea7 WW |
2042 | (rt->rt6i_flags & RTF_PCPU || |
2043 | rcu_access_pointer(rt->rt6i_node)); | |
0d3f6d29 MKL |
2044 | } |
2045 | ||
45e4fd26 MKL |
2046 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
2047 | const struct ipv6hdr *iph, u32 mtu) | |
1da177e4 | 2048 | { |
0dec879f | 2049 | const struct in6_addr *daddr, *saddr; |
67ba4152 | 2050 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 2051 | |
45e4fd26 MKL |
2052 | if (rt6->rt6i_flags & RTF_LOCAL) |
2053 | return; | |
81aded24 | 2054 | |
19bda36c XL |
2055 | if (dst_metric_locked(dst, RTAX_MTU)) |
2056 | return; | |
2057 | ||
0dec879f JA |
2058 | if (iph) { |
2059 | daddr = &iph->daddr; | |
2060 | saddr = &iph->saddr; | |
2061 | } else if (sk) { | |
2062 | daddr = &sk->sk_v6_daddr; | |
2063 | saddr = &inet6_sk(sk)->saddr; | |
2064 | } else { | |
2065 | daddr = NULL; | |
2066 | saddr = NULL; | |
2067 | } | |
2068 | dst_confirm_neigh(dst, daddr); | |
45e4fd26 MKL |
2069 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); |
2070 | if (mtu >= dst_mtu(dst)) | |
2071 | return; | |
9d289715 | 2072 | |
0d3f6d29 | 2073 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 | 2074 | rt6_do_update_pmtu(rt6, mtu); |
2b760fcf WW |
2075 | /* update rt6_ex->stamp for cache */ |
2076 | if (rt6->rt6i_flags & RTF_CACHE) | |
2077 | rt6_update_exception_stamp_rt(rt6); | |
0dec879f | 2078 | } else if (daddr) { |
45e4fd26 MKL |
2079 | struct rt6_info *nrt6; |
2080 | ||
45e4fd26 MKL |
2081 | nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr); |
2082 | if (nrt6) { | |
2083 | rt6_do_update_pmtu(nrt6, mtu); | |
2b760fcf WW |
2084 | if (rt6_insert_exception(nrt6, rt6)) |
2085 | dst_release_immediate(&nrt6->dst); | |
45e4fd26 | 2086 | } |
1da177e4 LT |
2087 | } |
2088 | } | |
2089 | ||
45e4fd26 MKL |
2090 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
2091 | struct sk_buff *skb, u32 mtu) | |
2092 | { | |
2093 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu); | |
2094 | } | |
2095 | ||
42ae66c8 | 2096 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
e2d118a1 | 2097 | int oif, u32 mark, kuid_t uid) |
81aded24 DM |
2098 | { |
2099 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2100 | struct dst_entry *dst; | |
2101 | struct flowi6 fl6; | |
2102 | ||
2103 | memset(&fl6, 0, sizeof(fl6)); | |
2104 | fl6.flowi6_oif = oif; | |
1b3c61dc | 2105 | fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); |
81aded24 DM |
2106 | fl6.daddr = iph->daddr; |
2107 | fl6.saddr = iph->saddr; | |
6502ca52 | 2108 | fl6.flowlabel = ip6_flowinfo(iph); |
e2d118a1 | 2109 | fl6.flowi6_uid = uid; |
81aded24 DM |
2110 | |
2111 | dst = ip6_route_output(net, NULL, &fl6); | |
2112 | if (!dst->error) | |
45e4fd26 | 2113 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu)); |
81aded24 DM |
2114 | dst_release(dst); |
2115 | } | |
2116 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
2117 | ||
2118 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
2119 | { | |
33c162a9 MKL |
2120 | struct dst_entry *dst; |
2121 | ||
81aded24 | 2122 | ip6_update_pmtu(skb, sock_net(sk), mtu, |
e2d118a1 | 2123 | sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid); |
33c162a9 MKL |
2124 | |
2125 | dst = __sk_dst_get(sk); | |
2126 | if (!dst || !dst->obsolete || | |
2127 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) | |
2128 | return; | |
2129 | ||
2130 | bh_lock_sock(sk); | |
2131 | if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
2132 | ip6_datagram_dst_update(sk, false); | |
2133 | bh_unlock_sock(sk); | |
81aded24 DM |
2134 | } |
2135 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
2136 | ||
b55b76b2 DJ |
2137 | /* Handle redirects */ |
2138 | struct ip6rd_flowi { | |
2139 | struct flowi6 fl6; | |
2140 | struct in6_addr gateway; | |
2141 | }; | |
2142 | ||
2143 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
2144 | struct fib6_table *table, | |
2145 | struct flowi6 *fl6, | |
2146 | int flags) | |
2147 | { | |
2148 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
2b760fcf | 2149 | struct rt6_info *rt, *rt_cache; |
b55b76b2 DJ |
2150 | struct fib6_node *fn; |
2151 | ||
2152 | /* Get the "current" route for this destination and | |
67c408cf | 2153 | * check if the redirect has come from appropriate router. |
b55b76b2 DJ |
2154 | * |
2155 | * RFC 4861 specifies that redirects should only be | |
2156 | * accepted if they come from the nexthop to the target. | |
2157 | * Due to the way the routes are chosen, this notion | |
2158 | * is a bit fuzzy and one might need to check all possible | |
2159 | * routes. | |
2160 | */ | |
2161 | ||
66f5d6ce | 2162 | rcu_read_lock(); |
b55b76b2 DJ |
2163 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
2164 | restart: | |
66f5d6ce | 2165 | for_each_fib6_node_rt_rcu(fn) { |
8067bb8c IS |
2166 | if (rt->rt6i_nh_flags & RTNH_F_DEAD) |
2167 | continue; | |
b55b76b2 DJ |
2168 | if (rt6_check_expired(rt)) |
2169 | continue; | |
2170 | if (rt->dst.error) | |
2171 | break; | |
2172 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
2173 | continue; | |
2174 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) | |
2175 | continue; | |
2b760fcf WW |
2176 | /* rt_cache's gateway might be different from its 'parent' |
2177 | * in the case of an ip redirect. | |
2178 | * So we keep searching in the exception table if the gateway | |
2179 | * is different. | |
2180 | */ | |
2181 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) { | |
2182 | rt_cache = rt6_find_cached_rt(rt, | |
2183 | &fl6->daddr, | |
2184 | &fl6->saddr); | |
2185 | if (rt_cache && | |
2186 | ipv6_addr_equal(&rdfl->gateway, | |
2187 | &rt_cache->rt6i_gateway)) { | |
2188 | rt = rt_cache; | |
2189 | break; | |
2190 | } | |
b55b76b2 | 2191 | continue; |
2b760fcf | 2192 | } |
b55b76b2 DJ |
2193 | break; |
2194 | } | |
2195 | ||
2196 | if (!rt) | |
2197 | rt = net->ipv6.ip6_null_entry; | |
2198 | else if (rt->dst.error) { | |
2199 | rt = net->ipv6.ip6_null_entry; | |
b0a1ba59 MKL |
2200 | goto out; |
2201 | } | |
2202 | ||
2203 | if (rt == net->ipv6.ip6_null_entry) { | |
a3c00e46 MKL |
2204 | fn = fib6_backtrack(fn, &fl6->saddr); |
2205 | if (fn) | |
2206 | goto restart; | |
b55b76b2 | 2207 | } |
a3c00e46 | 2208 | |
b0a1ba59 | 2209 | out: |
d3843fe5 | 2210 | ip6_hold_safe(net, &rt, true); |
b55b76b2 | 2211 | |
66f5d6ce | 2212 | rcu_read_unlock(); |
b55b76b2 | 2213 | |
b65f164d | 2214 | trace_fib6_table_lookup(net, rt, table, fl6); |
b55b76b2 DJ |
2215 | return rt; |
2216 | }; | |
2217 | ||
2218 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
2219 | const struct flowi6 *fl6, | |
2220 | const struct in6_addr *gateway) | |
2221 | { | |
2222 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
2223 | struct ip6rd_flowi rdfl; | |
2224 | ||
2225 | rdfl.fl6 = *fl6; | |
2226 | rdfl.gateway = *gateway; | |
2227 | ||
2228 | return fib6_rule_lookup(net, &rdfl.fl6, | |
2229 | flags, __ip6_route_redirect); | |
2230 | } | |
2231 | ||
e2d118a1 LC |
2232 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
2233 | kuid_t uid) | |
3a5ad2ee DM |
2234 | { |
2235 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2236 | struct dst_entry *dst; | |
2237 | struct flowi6 fl6; | |
2238 | ||
2239 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 2240 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
3a5ad2ee DM |
2241 | fl6.flowi6_oif = oif; |
2242 | fl6.flowi6_mark = mark; | |
3a5ad2ee DM |
2243 | fl6.daddr = iph->daddr; |
2244 | fl6.saddr = iph->saddr; | |
6502ca52 | 2245 | fl6.flowlabel = ip6_flowinfo(iph); |
e2d118a1 | 2246 | fl6.flowi6_uid = uid; |
3a5ad2ee | 2247 | |
b55b76b2 DJ |
2248 | dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
2249 | rt6_do_redirect(dst, NULL, skb); | |
3a5ad2ee DM |
2250 | dst_release(dst); |
2251 | } | |
2252 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
2253 | ||
c92a59ec DJ |
2254 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
2255 | u32 mark) | |
2256 | { | |
2257 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
2258 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
2259 | struct dst_entry *dst; | |
2260 | struct flowi6 fl6; | |
2261 | ||
2262 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 2263 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
c92a59ec DJ |
2264 | fl6.flowi6_oif = oif; |
2265 | fl6.flowi6_mark = mark; | |
c92a59ec DJ |
2266 | fl6.daddr = msg->dest; |
2267 | fl6.saddr = iph->daddr; | |
e2d118a1 | 2268 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
c92a59ec | 2269 | |
b55b76b2 DJ |
2270 | dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
2271 | rt6_do_redirect(dst, NULL, skb); | |
c92a59ec DJ |
2272 | dst_release(dst); |
2273 | } | |
2274 | ||
3a5ad2ee DM |
2275 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
2276 | { | |
e2d118a1 LC |
2277 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark, |
2278 | sk->sk_uid); | |
3a5ad2ee DM |
2279 | } |
2280 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
2281 | ||
0dbaee3b | 2282 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 2283 | { |
0dbaee3b DM |
2284 | struct net_device *dev = dst->dev; |
2285 | unsigned int mtu = dst_mtu(dst); | |
2286 | struct net *net = dev_net(dev); | |
2287 | ||
1da177e4 LT |
2288 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
2289 | ||
5578689a DL |
2290 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
2291 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
2292 | |
2293 | /* | |
1ab1457c YH |
2294 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
2295 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
2296 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
2297 | * rely only on pmtu discovery" |
2298 | */ | |
2299 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
2300 | mtu = IPV6_MAXPLEN; | |
2301 | return mtu; | |
2302 | } | |
2303 | ||
ebb762f2 | 2304 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 2305 | { |
4b32b5ad MKL |
2306 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
2307 | unsigned int mtu = rt->rt6i_pmtu; | |
d33e4553 | 2308 | struct inet6_dev *idev; |
618f9bc7 | 2309 | |
4b32b5ad MKL |
2310 | if (mtu) |
2311 | goto out; | |
2312 | ||
2313 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 2314 | if (mtu) |
30f78d8e | 2315 | goto out; |
618f9bc7 SK |
2316 | |
2317 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
2318 | |
2319 | rcu_read_lock(); | |
2320 | idev = __in6_dev_get(dst->dev); | |
2321 | if (idev) | |
2322 | mtu = idev->cnf.mtu6; | |
2323 | rcu_read_unlock(); | |
2324 | ||
30f78d8e | 2325 | out: |
14972cbd RP |
2326 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
2327 | ||
2328 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
2329 | } |
2330 | ||
3b00944c | 2331 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 2332 | struct flowi6 *fl6) |
1da177e4 | 2333 | { |
87a11578 | 2334 | struct dst_entry *dst; |
1da177e4 LT |
2335 | struct rt6_info *rt; |
2336 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 2337 | struct net *net = dev_net(dev); |
1da177e4 | 2338 | |
38308473 | 2339 | if (unlikely(!idev)) |
122bdf67 | 2340 | return ERR_PTR(-ENODEV); |
1da177e4 | 2341 | |
ad706862 | 2342 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 2343 | if (unlikely(!rt)) { |
1da177e4 | 2344 | in6_dev_put(idev); |
87a11578 | 2345 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
2346 | goto out; |
2347 | } | |
2348 | ||
8e2ec639 | 2349 | rt->dst.flags |= DST_HOST; |
588753f1 | 2350 | rt->dst.input = ip6_input; |
8e2ec639 | 2351 | rt->dst.output = ip6_output; |
550bab42 | 2352 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 2353 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
2354 | rt->rt6i_dst.plen = 128; |
2355 | rt->rt6i_idev = idev; | |
14edd87d | 2356 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 2357 | |
4c981e28 | 2358 | /* Add this dst into uncached_list so that rt6_disable_ip() can |
587fea74 WW |
2359 | * do proper release of the net_device |
2360 | */ | |
2361 | rt6_uncached_list_add(rt); | |
81eb8447 | 2362 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
1da177e4 | 2363 | |
87a11578 DM |
2364 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
2365 | ||
1da177e4 | 2366 | out: |
87a11578 | 2367 | return dst; |
1da177e4 LT |
2368 | } |
2369 | ||
569d3645 | 2370 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 2371 | { |
86393e52 | 2372 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
2373 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
2374 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
2375 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2376 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2377 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 2378 | int entries; |
7019b78e | 2379 | |
fc66f95c | 2380 | entries = dst_entries_get_fast(ops); |
49a18d86 | 2381 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 2382 | entries <= rt_max_size) |
1da177e4 LT |
2383 | goto out; |
2384 | ||
6891a346 | 2385 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 2386 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
2387 | entries = dst_entries_get_slow(ops); |
2388 | if (entries < ops->gc_thresh) | |
7019b78e | 2389 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 2390 | out: |
7019b78e | 2391 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 2392 | return entries > rt_max_size; |
1da177e4 LT |
2393 | } |
2394 | ||
e715b6d3 FW |
2395 | static int ip6_convert_metrics(struct mx6_config *mxc, |
2396 | const struct fib6_config *cfg) | |
2397 | { | |
6670e152 | 2398 | struct net *net = cfg->fc_nlinfo.nl_net; |
c3a8d947 | 2399 | bool ecn_ca = false; |
e715b6d3 FW |
2400 | struct nlattr *nla; |
2401 | int remaining; | |
2402 | u32 *mp; | |
2403 | ||
63159f29 | 2404 | if (!cfg->fc_mx) |
e715b6d3 FW |
2405 | return 0; |
2406 | ||
2407 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
2408 | if (unlikely(!mp)) | |
2409 | return -ENOMEM; | |
2410 | ||
2411 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
2412 | int type = nla_type(nla); | |
1bb14807 | 2413 | u32 val; |
e715b6d3 | 2414 | |
1bb14807 DB |
2415 | if (!type) |
2416 | continue; | |
2417 | if (unlikely(type > RTAX_MAX)) | |
2418 | goto err; | |
ea697639 | 2419 | |
1bb14807 DB |
2420 | if (type == RTAX_CC_ALGO) { |
2421 | char tmp[TCP_CA_NAME_MAX]; | |
e715b6d3 | 2422 | |
1bb14807 | 2423 | nla_strlcpy(tmp, nla, sizeof(tmp)); |
6670e152 | 2424 | val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca); |
1bb14807 DB |
2425 | if (val == TCP_CA_UNSPEC) |
2426 | goto err; | |
2427 | } else { | |
2428 | val = nla_get_u32(nla); | |
e715b6d3 | 2429 | } |
626abd59 PA |
2430 | if (type == RTAX_HOPLIMIT && val > 255) |
2431 | val = 255; | |
b8d3e416 DB |
2432 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
2433 | goto err; | |
1bb14807 DB |
2434 | |
2435 | mp[type - 1] = val; | |
2436 | __set_bit(type - 1, mxc->mx_valid); | |
e715b6d3 FW |
2437 | } |
2438 | ||
c3a8d947 DB |
2439 | if (ecn_ca) { |
2440 | __set_bit(RTAX_FEATURES - 1, mxc->mx_valid); | |
2441 | mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; | |
2442 | } | |
e715b6d3 | 2443 | |
c3a8d947 | 2444 | mxc->mx = mp; |
e715b6d3 FW |
2445 | return 0; |
2446 | err: | |
2447 | kfree(mp); | |
2448 | return -EINVAL; | |
2449 | } | |
1da177e4 | 2450 | |
8c14586f DA |
2451 | static struct rt6_info *ip6_nh_lookup_table(struct net *net, |
2452 | struct fib6_config *cfg, | |
2453 | const struct in6_addr *gw_addr) | |
2454 | { | |
2455 | struct flowi6 fl6 = { | |
2456 | .flowi6_oif = cfg->fc_ifindex, | |
2457 | .daddr = *gw_addr, | |
2458 | .saddr = cfg->fc_prefsrc, | |
2459 | }; | |
2460 | struct fib6_table *table; | |
2461 | struct rt6_info *rt; | |
d5d32e4b | 2462 | int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE; |
8c14586f DA |
2463 | |
2464 | table = fib6_get_table(net, cfg->fc_table); | |
2465 | if (!table) | |
2466 | return NULL; | |
2467 | ||
2468 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) | |
2469 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2470 | ||
2471 | rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags); | |
2472 | ||
2473 | /* if table lookup failed, fall back to full lookup */ | |
2474 | if (rt == net->ipv6.ip6_null_entry) { | |
2475 | ip6_rt_put(rt); | |
2476 | rt = NULL; | |
2477 | } | |
2478 | ||
2479 | return rt; | |
2480 | } | |
2481 | ||
333c4301 DA |
2482 | static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg, |
2483 | struct netlink_ext_ack *extack) | |
1da177e4 | 2484 | { |
5578689a | 2485 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
2486 | struct rt6_info *rt = NULL; |
2487 | struct net_device *dev = NULL; | |
2488 | struct inet6_dev *idev = NULL; | |
c71099ac | 2489 | struct fib6_table *table; |
1da177e4 | 2490 | int addr_type; |
8c5b83f0 | 2491 | int err = -EINVAL; |
1da177e4 | 2492 | |
557c44be | 2493 | /* RTF_PCPU is an internal flag; can not be set by userspace */ |
d5d531cb DA |
2494 | if (cfg->fc_flags & RTF_PCPU) { |
2495 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU"); | |
557c44be | 2496 | goto out; |
d5d531cb | 2497 | } |
557c44be | 2498 | |
2ea2352e WW |
2499 | /* RTF_CACHE is an internal flag; can not be set by userspace */ |
2500 | if (cfg->fc_flags & RTF_CACHE) { | |
2501 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE"); | |
2502 | goto out; | |
2503 | } | |
2504 | ||
d5d531cb DA |
2505 | if (cfg->fc_dst_len > 128) { |
2506 | NL_SET_ERR_MSG(extack, "Invalid prefix length"); | |
2507 | goto out; | |
2508 | } | |
2509 | if (cfg->fc_src_len > 128) { | |
2510 | NL_SET_ERR_MSG(extack, "Invalid source address length"); | |
8c5b83f0 | 2511 | goto out; |
d5d531cb | 2512 | } |
1da177e4 | 2513 | #ifndef CONFIG_IPV6_SUBTREES |
d5d531cb DA |
2514 | if (cfg->fc_src_len) { |
2515 | NL_SET_ERR_MSG(extack, | |
2516 | "Specifying source address requires IPV6_SUBTREES to be enabled"); | |
8c5b83f0 | 2517 | goto out; |
d5d531cb | 2518 | } |
1da177e4 | 2519 | #endif |
86872cb5 | 2520 | if (cfg->fc_ifindex) { |
1da177e4 | 2521 | err = -ENODEV; |
5578689a | 2522 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
2523 | if (!dev) |
2524 | goto out; | |
2525 | idev = in6_dev_get(dev); | |
2526 | if (!idev) | |
2527 | goto out; | |
2528 | } | |
2529 | ||
86872cb5 TG |
2530 | if (cfg->fc_metric == 0) |
2531 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 2532 | |
d71314b4 | 2533 | err = -ENOBUFS; |
38308473 DM |
2534 | if (cfg->fc_nlinfo.nlh && |
2535 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 2536 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 2537 | if (!table) { |
f3213831 | 2538 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
2539 | table = fib6_new_table(net, cfg->fc_table); |
2540 | } | |
2541 | } else { | |
2542 | table = fib6_new_table(net, cfg->fc_table); | |
2543 | } | |
38308473 DM |
2544 | |
2545 | if (!table) | |
c71099ac | 2546 | goto out; |
c71099ac | 2547 | |
ad706862 MKL |
2548 | rt = ip6_dst_alloc(net, NULL, |
2549 | (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT); | |
1da177e4 | 2550 | |
38308473 | 2551 | if (!rt) { |
1da177e4 LT |
2552 | err = -ENOMEM; |
2553 | goto out; | |
2554 | } | |
2555 | ||
1716a961 G |
2556 | if (cfg->fc_flags & RTF_EXPIRES) |
2557 | rt6_set_expires(rt, jiffies + | |
2558 | clock_t_to_jiffies(cfg->fc_expires)); | |
2559 | else | |
2560 | rt6_clean_expires(rt); | |
1da177e4 | 2561 | |
86872cb5 TG |
2562 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
2563 | cfg->fc_protocol = RTPROT_BOOT; | |
2564 | rt->rt6i_protocol = cfg->fc_protocol; | |
2565 | ||
2566 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
2567 | |
2568 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 2569 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
2570 | else if (cfg->fc_flags & RTF_LOCAL) |
2571 | rt->dst.input = ip6_input; | |
1da177e4 | 2572 | else |
d8d1f30b | 2573 | rt->dst.input = ip6_forward; |
1da177e4 | 2574 | |
d8d1f30b | 2575 | rt->dst.output = ip6_output; |
1da177e4 | 2576 | |
19e42e45 RP |
2577 | if (cfg->fc_encap) { |
2578 | struct lwtunnel_state *lwtstate; | |
2579 | ||
30357d7d | 2580 | err = lwtunnel_build_state(cfg->fc_encap_type, |
127eb7cd | 2581 | cfg->fc_encap, AF_INET6, cfg, |
9ae28727 | 2582 | &lwtstate, extack); |
19e42e45 RP |
2583 | if (err) |
2584 | goto out; | |
61adedf3 JB |
2585 | rt->dst.lwtstate = lwtstate_get(lwtstate); |
2586 | if (lwtunnel_output_redirect(rt->dst.lwtstate)) { | |
2587 | rt->dst.lwtstate->orig_output = rt->dst.output; | |
2588 | rt->dst.output = lwtunnel_output; | |
25368623 | 2589 | } |
61adedf3 JB |
2590 | if (lwtunnel_input_redirect(rt->dst.lwtstate)) { |
2591 | rt->dst.lwtstate->orig_input = rt->dst.input; | |
2592 | rt->dst.input = lwtunnel_input; | |
25368623 | 2593 | } |
19e42e45 RP |
2594 | } |
2595 | ||
86872cb5 TG |
2596 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
2597 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
afc4eef8 | 2598 | if (rt->rt6i_dst.plen == 128) |
e5fd387a | 2599 | rt->dst.flags |= DST_HOST; |
e5fd387a | 2600 | |
1da177e4 | 2601 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
2602 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
2603 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
2604 | #endif |
2605 | ||
86872cb5 | 2606 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
2607 | |
2608 | /* We cannot add true routes via loopback here, | |
2609 | they would result in kernel looping; promote them to reject routes | |
2610 | */ | |
86872cb5 | 2611 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
2612 | (dev && (dev->flags & IFF_LOOPBACK) && |
2613 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
2614 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 2615 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 2616 | if (dev != net->loopback_dev) { |
1da177e4 LT |
2617 | if (dev) { |
2618 | dev_put(dev); | |
2619 | in6_dev_put(idev); | |
2620 | } | |
5578689a | 2621 | dev = net->loopback_dev; |
1da177e4 LT |
2622 | dev_hold(dev); |
2623 | idev = in6_dev_get(dev); | |
2624 | if (!idev) { | |
2625 | err = -ENODEV; | |
2626 | goto out; | |
2627 | } | |
2628 | } | |
1da177e4 | 2629 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
2630 | switch (cfg->fc_type) { |
2631 | case RTN_BLACKHOLE: | |
2632 | rt->dst.error = -EINVAL; | |
ede2059d | 2633 | rt->dst.output = dst_discard_out; |
7150aede | 2634 | rt->dst.input = dst_discard; |
ef2c7d7b ND |
2635 | break; |
2636 | case RTN_PROHIBIT: | |
2637 | rt->dst.error = -EACCES; | |
7150aede K |
2638 | rt->dst.output = ip6_pkt_prohibit_out; |
2639 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 2640 | break; |
b4949ab2 | 2641 | case RTN_THROW: |
0315e382 | 2642 | case RTN_UNREACHABLE: |
ef2c7d7b | 2643 | default: |
7150aede | 2644 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
0315e382 NF |
2645 | : (cfg->fc_type == RTN_UNREACHABLE) |
2646 | ? -EHOSTUNREACH : -ENETUNREACH; | |
7150aede K |
2647 | rt->dst.output = ip6_pkt_discard_out; |
2648 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
2649 | break; |
2650 | } | |
1da177e4 LT |
2651 | goto install_route; |
2652 | } | |
2653 | ||
86872cb5 | 2654 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 2655 | const struct in6_addr *gw_addr; |
1da177e4 LT |
2656 | int gwa_type; |
2657 | ||
86872cb5 | 2658 | gw_addr = &cfg->fc_gateway; |
330567b7 | 2659 | gwa_type = ipv6_addr_type(gw_addr); |
48ed7b26 FW |
2660 | |
2661 | /* if gw_addr is local we will fail to detect this in case | |
2662 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
2663 | * will return already-added prefix route via interface that | |
2664 | * prefix route was assigned to, which might be non-loopback. | |
2665 | */ | |
2666 | err = -EINVAL; | |
330567b7 FW |
2667 | if (ipv6_chk_addr_and_flags(net, gw_addr, |
2668 | gwa_type & IPV6_ADDR_LINKLOCAL ? | |
d5d531cb DA |
2669 | dev : NULL, 0, 0)) { |
2670 | NL_SET_ERR_MSG(extack, "Invalid gateway address"); | |
48ed7b26 | 2671 | goto out; |
d5d531cb | 2672 | } |
4e3fd7a0 | 2673 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
2674 | |
2675 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
8c14586f | 2676 | struct rt6_info *grt = NULL; |
1da177e4 LT |
2677 | |
2678 | /* IPv6 strictly inhibits using not link-local | |
2679 | addresses as nexthop address. | |
2680 | Otherwise, router will not able to send redirects. | |
2681 | It is very good, but in some (rare!) circumstances | |
2682 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
2683 | some exceptions. --ANK | |
96d5822c EN |
2684 | We allow IPv4-mapped nexthops to support RFC4798-type |
2685 | addressing | |
1da177e4 | 2686 | */ |
96d5822c | 2687 | if (!(gwa_type & (IPV6_ADDR_UNICAST | |
d5d531cb DA |
2688 | IPV6_ADDR_MAPPED))) { |
2689 | NL_SET_ERR_MSG(extack, | |
2690 | "Invalid gateway address"); | |
1da177e4 | 2691 | goto out; |
d5d531cb | 2692 | } |
1da177e4 | 2693 | |
a435a07f | 2694 | if (cfg->fc_table) { |
8c14586f DA |
2695 | grt = ip6_nh_lookup_table(net, cfg, gw_addr); |
2696 | ||
a435a07f VB |
2697 | if (grt) { |
2698 | if (grt->rt6i_flags & RTF_GATEWAY || | |
2699 | (dev && dev != grt->dst.dev)) { | |
2700 | ip6_rt_put(grt); | |
2701 | grt = NULL; | |
2702 | } | |
2703 | } | |
2704 | } | |
2705 | ||
8c14586f DA |
2706 | if (!grt) |
2707 | grt = rt6_lookup(net, gw_addr, NULL, | |
2708 | cfg->fc_ifindex, 1); | |
1da177e4 LT |
2709 | |
2710 | err = -EHOSTUNREACH; | |
38308473 | 2711 | if (!grt) |
1da177e4 LT |
2712 | goto out; |
2713 | if (dev) { | |
d1918542 | 2714 | if (dev != grt->dst.dev) { |
94e187c0 | 2715 | ip6_rt_put(grt); |
1da177e4 LT |
2716 | goto out; |
2717 | } | |
2718 | } else { | |
d1918542 | 2719 | dev = grt->dst.dev; |
1da177e4 LT |
2720 | idev = grt->rt6i_idev; |
2721 | dev_hold(dev); | |
2722 | in6_dev_hold(grt->rt6i_idev); | |
2723 | } | |
38308473 | 2724 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 2725 | err = 0; |
94e187c0 | 2726 | ip6_rt_put(grt); |
1da177e4 LT |
2727 | |
2728 | if (err) | |
2729 | goto out; | |
2730 | } | |
2731 | err = -EINVAL; | |
d5d531cb DA |
2732 | if (!dev) { |
2733 | NL_SET_ERR_MSG(extack, "Egress device not specified"); | |
2734 | goto out; | |
2735 | } else if (dev->flags & IFF_LOOPBACK) { | |
2736 | NL_SET_ERR_MSG(extack, | |
2737 | "Egress device can not be loopback device for this route"); | |
1da177e4 | 2738 | goto out; |
d5d531cb | 2739 | } |
1da177e4 LT |
2740 | } |
2741 | ||
2742 | err = -ENODEV; | |
38308473 | 2743 | if (!dev) |
1da177e4 LT |
2744 | goto out; |
2745 | ||
c3968a85 DW |
2746 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
2747 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
d5d531cb | 2748 | NL_SET_ERR_MSG(extack, "Invalid source address"); |
c3968a85 DW |
2749 | err = -EINVAL; |
2750 | goto out; | |
2751 | } | |
4e3fd7a0 | 2752 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
2753 | rt->rt6i_prefsrc.plen = 128; |
2754 | } else | |
2755 | rt->rt6i_prefsrc.plen = 0; | |
2756 | ||
86872cb5 | 2757 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
2758 | |
2759 | install_route: | |
5609b80a IS |
2760 | if (!(rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST)) && |
2761 | !netif_carrier_ok(dev)) | |
2762 | rt->rt6i_nh_flags |= RTNH_F_LINKDOWN; | |
d8d1f30b | 2763 | rt->dst.dev = dev; |
1da177e4 | 2764 | rt->rt6i_idev = idev; |
c71099ac | 2765 | rt->rt6i_table = table; |
63152fc0 | 2766 | |
c346dca1 | 2767 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 2768 | |
8c5b83f0 | 2769 | return rt; |
6b9ea5a6 RP |
2770 | out: |
2771 | if (dev) | |
2772 | dev_put(dev); | |
2773 | if (idev) | |
2774 | in6_dev_put(idev); | |
587fea74 WW |
2775 | if (rt) |
2776 | dst_release_immediate(&rt->dst); | |
6b9ea5a6 | 2777 | |
8c5b83f0 | 2778 | return ERR_PTR(err); |
6b9ea5a6 RP |
2779 | } |
2780 | ||
333c4301 DA |
2781 | int ip6_route_add(struct fib6_config *cfg, |
2782 | struct netlink_ext_ack *extack) | |
6b9ea5a6 RP |
2783 | { |
2784 | struct mx6_config mxc = { .mx = NULL, }; | |
8c5b83f0 | 2785 | struct rt6_info *rt; |
6b9ea5a6 RP |
2786 | int err; |
2787 | ||
333c4301 | 2788 | rt = ip6_route_info_create(cfg, extack); |
8c5b83f0 RP |
2789 | if (IS_ERR(rt)) { |
2790 | err = PTR_ERR(rt); | |
2791 | rt = NULL; | |
6b9ea5a6 | 2792 | goto out; |
8c5b83f0 | 2793 | } |
6b9ea5a6 | 2794 | |
e715b6d3 FW |
2795 | err = ip6_convert_metrics(&mxc, cfg); |
2796 | if (err) | |
2797 | goto out; | |
1da177e4 | 2798 | |
333c4301 | 2799 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc, extack); |
e715b6d3 FW |
2800 | |
2801 | kfree(mxc.mx); | |
6b9ea5a6 | 2802 | |
e715b6d3 | 2803 | return err; |
1da177e4 | 2804 | out: |
587fea74 WW |
2805 | if (rt) |
2806 | dst_release_immediate(&rt->dst); | |
6b9ea5a6 | 2807 | |
1da177e4 LT |
2808 | return err; |
2809 | } | |
2810 | ||
86872cb5 | 2811 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2812 | { |
2813 | int err; | |
c71099ac | 2814 | struct fib6_table *table; |
d1918542 | 2815 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 2816 | |
a4c2fd7f | 2817 | if (rt == net->ipv6.ip6_null_entry) { |
6825a26c G |
2818 | err = -ENOENT; |
2819 | goto out; | |
2820 | } | |
6c813a72 | 2821 | |
c71099ac | 2822 | table = rt->rt6i_table; |
66f5d6ce | 2823 | spin_lock_bh(&table->tb6_lock); |
86872cb5 | 2824 | err = fib6_del(rt, info); |
66f5d6ce | 2825 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 | 2826 | |
6825a26c | 2827 | out: |
94e187c0 | 2828 | ip6_rt_put(rt); |
1da177e4 LT |
2829 | return err; |
2830 | } | |
2831 | ||
e0a1ad73 TG |
2832 | int ip6_del_rt(struct rt6_info *rt) |
2833 | { | |
4d1169c1 | 2834 | struct nl_info info = { |
d1918542 | 2835 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 2836 | }; |
528c4ceb | 2837 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
2838 | } |
2839 | ||
0ae81335 DA |
2840 | static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg) |
2841 | { | |
2842 | struct nl_info *info = &cfg->fc_nlinfo; | |
e3330039 | 2843 | struct net *net = info->nl_net; |
16a16cd3 | 2844 | struct sk_buff *skb = NULL; |
0ae81335 | 2845 | struct fib6_table *table; |
e3330039 | 2846 | int err = -ENOENT; |
0ae81335 | 2847 | |
e3330039 WC |
2848 | if (rt == net->ipv6.ip6_null_entry) |
2849 | goto out_put; | |
0ae81335 | 2850 | table = rt->rt6i_table; |
66f5d6ce | 2851 | spin_lock_bh(&table->tb6_lock); |
0ae81335 DA |
2852 | |
2853 | if (rt->rt6i_nsiblings && cfg->fc_delete_all_nh) { | |
2854 | struct rt6_info *sibling, *next_sibling; | |
2855 | ||
16a16cd3 DA |
2856 | /* prefer to send a single notification with all hops */ |
2857 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
2858 | if (skb) { | |
2859 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
2860 | ||
e3330039 | 2861 | if (rt6_fill_node(net, skb, rt, |
16a16cd3 DA |
2862 | NULL, NULL, 0, RTM_DELROUTE, |
2863 | info->portid, seq, 0) < 0) { | |
2864 | kfree_skb(skb); | |
2865 | skb = NULL; | |
2866 | } else | |
2867 | info->skip_notify = 1; | |
2868 | } | |
2869 | ||
0ae81335 DA |
2870 | list_for_each_entry_safe(sibling, next_sibling, |
2871 | &rt->rt6i_siblings, | |
2872 | rt6i_siblings) { | |
2873 | err = fib6_del(sibling, info); | |
2874 | if (err) | |
e3330039 | 2875 | goto out_unlock; |
0ae81335 DA |
2876 | } |
2877 | } | |
2878 | ||
2879 | err = fib6_del(rt, info); | |
e3330039 | 2880 | out_unlock: |
66f5d6ce | 2881 | spin_unlock_bh(&table->tb6_lock); |
e3330039 | 2882 | out_put: |
0ae81335 | 2883 | ip6_rt_put(rt); |
16a16cd3 DA |
2884 | |
2885 | if (skb) { | |
e3330039 | 2886 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
16a16cd3 DA |
2887 | info->nlh, gfp_any()); |
2888 | } | |
0ae81335 DA |
2889 | return err; |
2890 | } | |
2891 | ||
333c4301 DA |
2892 | static int ip6_route_del(struct fib6_config *cfg, |
2893 | struct netlink_ext_ack *extack) | |
1da177e4 | 2894 | { |
2b760fcf | 2895 | struct rt6_info *rt, *rt_cache; |
c71099ac | 2896 | struct fib6_table *table; |
1da177e4 | 2897 | struct fib6_node *fn; |
1da177e4 LT |
2898 | int err = -ESRCH; |
2899 | ||
5578689a | 2900 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
d5d531cb DA |
2901 | if (!table) { |
2902 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); | |
c71099ac | 2903 | return err; |
d5d531cb | 2904 | } |
c71099ac | 2905 | |
66f5d6ce | 2906 | rcu_read_lock(); |
1da177e4 | 2907 | |
c71099ac | 2908 | fn = fib6_locate(&table->tb6_root, |
86872cb5 | 2909 | &cfg->fc_dst, cfg->fc_dst_len, |
38fbeeee | 2910 | &cfg->fc_src, cfg->fc_src_len, |
2b760fcf | 2911 | !(cfg->fc_flags & RTF_CACHE)); |
1ab1457c | 2912 | |
1da177e4 | 2913 | if (fn) { |
66f5d6ce | 2914 | for_each_fib6_node_rt_rcu(fn) { |
2b760fcf WW |
2915 | if (cfg->fc_flags & RTF_CACHE) { |
2916 | rt_cache = rt6_find_cached_rt(rt, &cfg->fc_dst, | |
2917 | &cfg->fc_src); | |
2918 | if (!rt_cache) | |
2919 | continue; | |
2920 | rt = rt_cache; | |
2921 | } | |
86872cb5 | 2922 | if (cfg->fc_ifindex && |
d1918542 DM |
2923 | (!rt->dst.dev || |
2924 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 2925 | continue; |
86872cb5 TG |
2926 | if (cfg->fc_flags & RTF_GATEWAY && |
2927 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 2928 | continue; |
86872cb5 | 2929 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 2930 | continue; |
c2ed1880 M |
2931 | if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol) |
2932 | continue; | |
d3843fe5 WW |
2933 | if (!dst_hold_safe(&rt->dst)) |
2934 | break; | |
66f5d6ce | 2935 | rcu_read_unlock(); |
1da177e4 | 2936 | |
0ae81335 DA |
2937 | /* if gateway was specified only delete the one hop */ |
2938 | if (cfg->fc_flags & RTF_GATEWAY) | |
2939 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
2940 | ||
2941 | return __ip6_del_rt_siblings(rt, cfg); | |
1da177e4 LT |
2942 | } |
2943 | } | |
66f5d6ce | 2944 | rcu_read_unlock(); |
1da177e4 LT |
2945 | |
2946 | return err; | |
2947 | } | |
2948 | ||
6700c270 | 2949 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 2950 | { |
a6279458 | 2951 | struct netevent_redirect netevent; |
e8599ff4 | 2952 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
2953 | struct ndisc_options ndopts; |
2954 | struct inet6_dev *in6_dev; | |
2955 | struct neighbour *neigh; | |
71bcdba0 | 2956 | struct rd_msg *msg; |
6e157b6a DM |
2957 | int optlen, on_link; |
2958 | u8 *lladdr; | |
e8599ff4 | 2959 | |
29a3cad5 | 2960 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 2961 | optlen -= sizeof(*msg); |
e8599ff4 DM |
2962 | |
2963 | if (optlen < 0) { | |
6e157b6a | 2964 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
2965 | return; |
2966 | } | |
2967 | ||
71bcdba0 | 2968 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 2969 | |
71bcdba0 | 2970 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 2971 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
2972 | return; |
2973 | } | |
2974 | ||
6e157b6a | 2975 | on_link = 0; |
71bcdba0 | 2976 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 2977 | on_link = 1; |
71bcdba0 | 2978 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 2979 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 2980 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
2981 | return; |
2982 | } | |
2983 | ||
2984 | in6_dev = __in6_dev_get(skb->dev); | |
2985 | if (!in6_dev) | |
2986 | return; | |
2987 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
2988 | return; | |
2989 | ||
2990 | /* RFC2461 8.1: | |
2991 | * The IP source address of the Redirect MUST be the same as the current | |
2992 | * first-hop router for the specified ICMP Destination Address. | |
2993 | */ | |
2994 | ||
f997c55c | 2995 | if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
2996 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
2997 | return; | |
2998 | } | |
6e157b6a DM |
2999 | |
3000 | lladdr = NULL; | |
e8599ff4 DM |
3001 | if (ndopts.nd_opts_tgt_lladdr) { |
3002 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
3003 | skb->dev); | |
3004 | if (!lladdr) { | |
3005 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
3006 | return; | |
3007 | } | |
3008 | } | |
3009 | ||
6e157b6a | 3010 | rt = (struct rt6_info *) dst; |
ec13ad1d | 3011 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 3012 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 3013 | return; |
6e157b6a | 3014 | } |
e8599ff4 | 3015 | |
6e157b6a DM |
3016 | /* Redirect received -> path was valid. |
3017 | * Look, redirects are sent only in response to data packets, | |
3018 | * so that this nexthop apparently is reachable. --ANK | |
3019 | */ | |
0dec879f | 3020 | dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr); |
a6279458 | 3021 | |
71bcdba0 | 3022 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
3023 | if (!neigh) |
3024 | return; | |
a6279458 | 3025 | |
1da177e4 LT |
3026 | /* |
3027 | * We have finally decided to accept it. | |
3028 | */ | |
3029 | ||
f997c55c | 3030 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
3031 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
3032 | NEIGH_UPDATE_F_OVERRIDE| | |
3033 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
3034 | NEIGH_UPDATE_F_ISROUTER)), |
3035 | NDISC_REDIRECT, &ndopts); | |
1da177e4 | 3036 | |
83a09abd | 3037 | nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL); |
38308473 | 3038 | if (!nrt) |
1da177e4 LT |
3039 | goto out; |
3040 | ||
3041 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
3042 | if (on_link) | |
3043 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
3044 | ||
b91d5329 | 3045 | nrt->rt6i_protocol = RTPROT_REDIRECT; |
4e3fd7a0 | 3046 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 3047 | |
2b760fcf WW |
3048 | /* No need to remove rt from the exception table if rt is |
3049 | * a cached route because rt6_insert_exception() will | |
3050 | * takes care of it | |
3051 | */ | |
3052 | if (rt6_insert_exception(nrt, rt)) { | |
3053 | dst_release_immediate(&nrt->dst); | |
3054 | goto out; | |
3055 | } | |
1da177e4 | 3056 | |
d8d1f30b CG |
3057 | netevent.old = &rt->dst; |
3058 | netevent.new = &nrt->dst; | |
71bcdba0 | 3059 | netevent.daddr = &msg->dest; |
60592833 | 3060 | netevent.neigh = neigh; |
8d71740c TT |
3061 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
3062 | ||
1da177e4 | 3063 | out: |
e8599ff4 | 3064 | neigh_release(neigh); |
6e157b6a DM |
3065 | } |
3066 | ||
1da177e4 LT |
3067 | /* |
3068 | * Misc support functions | |
3069 | */ | |
3070 | ||
4b32b5ad MKL |
3071 | static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) |
3072 | { | |
3a2232e9 | 3073 | BUG_ON(from->from); |
4b32b5ad MKL |
3074 | |
3075 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
3076 | dst_hold(&from->dst); | |
3a2232e9 | 3077 | rt->from = from; |
4b32b5ad MKL |
3078 | dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true); |
3079 | } | |
3080 | ||
83a09abd MKL |
3081 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort) |
3082 | { | |
3083 | rt->dst.input = ort->dst.input; | |
3084 | rt->dst.output = ort->dst.output; | |
3085 | rt->rt6i_dst = ort->rt6i_dst; | |
3086 | rt->dst.error = ort->dst.error; | |
3087 | rt->rt6i_idev = ort->rt6i_idev; | |
3088 | if (rt->rt6i_idev) | |
3089 | in6_dev_hold(rt->rt6i_idev); | |
3090 | rt->dst.lastuse = jiffies; | |
3091 | rt->rt6i_gateway = ort->rt6i_gateway; | |
3092 | rt->rt6i_flags = ort->rt6i_flags; | |
3093 | rt6_set_from(rt, ort); | |
3094 | rt->rt6i_metric = ort->rt6i_metric; | |
1da177e4 | 3095 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd | 3096 | rt->rt6i_src = ort->rt6i_src; |
1da177e4 | 3097 | #endif |
83a09abd MKL |
3098 | rt->rt6i_prefsrc = ort->rt6i_prefsrc; |
3099 | rt->rt6i_table = ort->rt6i_table; | |
61adedf3 | 3100 | rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate); |
1da177e4 LT |
3101 | } |
3102 | ||
70ceb4f5 | 3103 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 3104 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 3105 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
3106 | const struct in6_addr *gwaddr, |
3107 | struct net_device *dev) | |
70ceb4f5 | 3108 | { |
830218c1 DA |
3109 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
3110 | int ifindex = dev->ifindex; | |
70ceb4f5 YH |
3111 | struct fib6_node *fn; |
3112 | struct rt6_info *rt = NULL; | |
c71099ac TG |
3113 | struct fib6_table *table; |
3114 | ||
830218c1 | 3115 | table = fib6_get_table(net, tb_id); |
38308473 | 3116 | if (!table) |
c71099ac | 3117 | return NULL; |
70ceb4f5 | 3118 | |
66f5d6ce | 3119 | rcu_read_lock(); |
38fbeeee | 3120 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true); |
70ceb4f5 YH |
3121 | if (!fn) |
3122 | goto out; | |
3123 | ||
66f5d6ce | 3124 | for_each_fib6_node_rt_rcu(fn) { |
d1918542 | 3125 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
3126 | continue; |
3127 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
3128 | continue; | |
3129 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
3130 | continue; | |
d3843fe5 | 3131 | ip6_hold_safe(NULL, &rt, false); |
70ceb4f5 YH |
3132 | break; |
3133 | } | |
3134 | out: | |
66f5d6ce | 3135 | rcu_read_unlock(); |
70ceb4f5 YH |
3136 | return rt; |
3137 | } | |
3138 | ||
efa2cea0 | 3139 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 3140 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
3141 | const struct in6_addr *gwaddr, |
3142 | struct net_device *dev, | |
95c96174 | 3143 | unsigned int pref) |
70ceb4f5 | 3144 | { |
86872cb5 | 3145 | struct fib6_config cfg = { |
238fc7ea | 3146 | .fc_metric = IP6_RT_PRIO_USER, |
830218c1 | 3147 | .fc_ifindex = dev->ifindex, |
86872cb5 TG |
3148 | .fc_dst_len = prefixlen, |
3149 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
3150 | RTF_UP | RTF_PREF(pref), | |
b91d5329 | 3151 | .fc_protocol = RTPROT_RA, |
15e47304 | 3152 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
3153 | .fc_nlinfo.nlh = NULL, |
3154 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
3155 | }; |
3156 | ||
830218c1 | 3157 | cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO, |
4e3fd7a0 AD |
3158 | cfg.fc_dst = *prefix; |
3159 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 3160 | |
e317da96 YH |
3161 | /* We should treat it as a default route if prefix length is 0. */ |
3162 | if (!prefixlen) | |
86872cb5 | 3163 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 3164 | |
333c4301 | 3165 | ip6_route_add(&cfg, NULL); |
70ceb4f5 | 3166 | |
830218c1 | 3167 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev); |
70ceb4f5 YH |
3168 | } |
3169 | #endif | |
3170 | ||
b71d1d42 | 3171 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 3172 | { |
830218c1 | 3173 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT; |
1da177e4 | 3174 | struct rt6_info *rt; |
c71099ac | 3175 | struct fib6_table *table; |
1da177e4 | 3176 | |
830218c1 | 3177 | table = fib6_get_table(dev_net(dev), tb_id); |
38308473 | 3178 | if (!table) |
c71099ac | 3179 | return NULL; |
1da177e4 | 3180 | |
66f5d6ce WW |
3181 | rcu_read_lock(); |
3182 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
d1918542 | 3183 | if (dev == rt->dst.dev && |
045927ff | 3184 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
3185 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
3186 | break; | |
3187 | } | |
3188 | if (rt) | |
d3843fe5 | 3189 | ip6_hold_safe(NULL, &rt, false); |
66f5d6ce | 3190 | rcu_read_unlock(); |
1da177e4 LT |
3191 | return rt; |
3192 | } | |
3193 | ||
b71d1d42 | 3194 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
3195 | struct net_device *dev, |
3196 | unsigned int pref) | |
1da177e4 | 3197 | { |
86872cb5 | 3198 | struct fib6_config cfg = { |
ca254490 | 3199 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
238fc7ea | 3200 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
3201 | .fc_ifindex = dev->ifindex, |
3202 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
3203 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
b91d5329 | 3204 | .fc_protocol = RTPROT_RA, |
15e47304 | 3205 | .fc_nlinfo.portid = 0, |
5578689a | 3206 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 3207 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 3208 | }; |
1da177e4 | 3209 | |
4e3fd7a0 | 3210 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 3211 | |
333c4301 | 3212 | if (!ip6_route_add(&cfg, NULL)) { |
830218c1 DA |
3213 | struct fib6_table *table; |
3214 | ||
3215 | table = fib6_get_table(dev_net(dev), cfg.fc_table); | |
3216 | if (table) | |
3217 | table->flags |= RT6_TABLE_HAS_DFLT_ROUTER; | |
3218 | } | |
1da177e4 | 3219 | |
1da177e4 LT |
3220 | return rt6_get_dflt_router(gwaddr, dev); |
3221 | } | |
3222 | ||
830218c1 | 3223 | static void __rt6_purge_dflt_routers(struct fib6_table *table) |
1da177e4 LT |
3224 | { |
3225 | struct rt6_info *rt; | |
3226 | ||
3227 | restart: | |
66f5d6ce WW |
3228 | rcu_read_lock(); |
3229 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
3e8b0ac3 LC |
3230 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
3231 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d3843fe5 | 3232 | if (dst_hold_safe(&rt->dst)) { |
66f5d6ce | 3233 | rcu_read_unlock(); |
d3843fe5 WW |
3234 | ip6_del_rt(rt); |
3235 | } else { | |
66f5d6ce | 3236 | rcu_read_unlock(); |
d3843fe5 | 3237 | } |
1da177e4 LT |
3238 | goto restart; |
3239 | } | |
3240 | } | |
66f5d6ce | 3241 | rcu_read_unlock(); |
830218c1 DA |
3242 | |
3243 | table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER; | |
3244 | } | |
3245 | ||
3246 | void rt6_purge_dflt_routers(struct net *net) | |
3247 | { | |
3248 | struct fib6_table *table; | |
3249 | struct hlist_head *head; | |
3250 | unsigned int h; | |
3251 | ||
3252 | rcu_read_lock(); | |
3253 | ||
3254 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
3255 | head = &net->ipv6.fib_table_hash[h]; | |
3256 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { | |
3257 | if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER) | |
3258 | __rt6_purge_dflt_routers(table); | |
3259 | } | |
3260 | } | |
3261 | ||
3262 | rcu_read_unlock(); | |
1da177e4 LT |
3263 | } |
3264 | ||
5578689a DL |
3265 | static void rtmsg_to_fib6_config(struct net *net, |
3266 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
3267 | struct fib6_config *cfg) |
3268 | { | |
3269 | memset(cfg, 0, sizeof(*cfg)); | |
3270 | ||
ca254490 DA |
3271 | cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? |
3272 | : RT6_TABLE_MAIN; | |
86872cb5 TG |
3273 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; |
3274 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
3275 | cfg->fc_expires = rtmsg->rtmsg_info; | |
3276 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
3277 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
3278 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
3279 | ||
5578689a | 3280 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 3281 | |
4e3fd7a0 AD |
3282 | cfg->fc_dst = rtmsg->rtmsg_dst; |
3283 | cfg->fc_src = rtmsg->rtmsg_src; | |
3284 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
3285 | } |
3286 | ||
5578689a | 3287 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 3288 | { |
86872cb5 | 3289 | struct fib6_config cfg; |
1da177e4 LT |
3290 | struct in6_rtmsg rtmsg; |
3291 | int err; | |
3292 | ||
67ba4152 | 3293 | switch (cmd) { |
1da177e4 LT |
3294 | case SIOCADDRT: /* Add a route */ |
3295 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 3296 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
3297 | return -EPERM; |
3298 | err = copy_from_user(&rtmsg, arg, | |
3299 | sizeof(struct in6_rtmsg)); | |
3300 | if (err) | |
3301 | return -EFAULT; | |
86872cb5 | 3302 | |
5578689a | 3303 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 3304 | |
1da177e4 LT |
3305 | rtnl_lock(); |
3306 | switch (cmd) { | |
3307 | case SIOCADDRT: | |
333c4301 | 3308 | err = ip6_route_add(&cfg, NULL); |
1da177e4 LT |
3309 | break; |
3310 | case SIOCDELRT: | |
333c4301 | 3311 | err = ip6_route_del(&cfg, NULL); |
1da177e4 LT |
3312 | break; |
3313 | default: | |
3314 | err = -EINVAL; | |
3315 | } | |
3316 | rtnl_unlock(); | |
3317 | ||
3318 | return err; | |
3ff50b79 | 3319 | } |
1da177e4 LT |
3320 | |
3321 | return -EINVAL; | |
3322 | } | |
3323 | ||
3324 | /* | |
3325 | * Drop the packet on the floor | |
3326 | */ | |
3327 | ||
d5fdd6ba | 3328 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 3329 | { |
612f09e8 | 3330 | int type; |
adf30907 | 3331 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
3332 | switch (ipstats_mib_noroutes) { |
3333 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 3334 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 3335 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
3336 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
3337 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
3338 | break; |
3339 | } | |
3340 | /* FALLTHROUGH */ | |
3341 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
3342 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
3343 | ipstats_mib_noroutes); | |
612f09e8 YH |
3344 | break; |
3345 | } | |
3ffe533c | 3346 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
3347 | kfree_skb(skb); |
3348 | return 0; | |
3349 | } | |
3350 | ||
9ce8ade0 TG |
3351 | static int ip6_pkt_discard(struct sk_buff *skb) |
3352 | { | |
612f09e8 | 3353 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
3354 | } |
3355 | ||
ede2059d | 3356 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 3357 | { |
adf30907 | 3358 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 3359 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
3360 | } |
3361 | ||
9ce8ade0 TG |
3362 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
3363 | { | |
612f09e8 | 3364 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
3365 | } |
3366 | ||
ede2059d | 3367 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 3368 | { |
adf30907 | 3369 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 3370 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
3371 | } |
3372 | ||
1da177e4 LT |
3373 | /* |
3374 | * Allocate a dst for local (unicast / anycast) address. | |
3375 | */ | |
3376 | ||
3377 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
3378 | const struct in6_addr *addr, | |
8f031519 | 3379 | bool anycast) |
1da177e4 | 3380 | { |
ca254490 | 3381 | u32 tb_id; |
c346dca1 | 3382 | struct net *net = dev_net(idev->dev); |
4832c30d | 3383 | struct net_device *dev = idev->dev; |
5f02ce24 DA |
3384 | struct rt6_info *rt; |
3385 | ||
5f02ce24 | 3386 | rt = ip6_dst_alloc(net, dev, DST_NOCOUNT); |
a3300ef4 | 3387 | if (!rt) |
1da177e4 LT |
3388 | return ERR_PTR(-ENOMEM); |
3389 | ||
1da177e4 LT |
3390 | in6_dev_hold(idev); |
3391 | ||
11d53b49 | 3392 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
3393 | rt->dst.input = ip6_input; |
3394 | rt->dst.output = ip6_output; | |
1da177e4 | 3395 | rt->rt6i_idev = idev; |
1da177e4 | 3396 | |
94b5e0f9 | 3397 | rt->rt6i_protocol = RTPROT_KERNEL; |
1da177e4 | 3398 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; |
58c4fb86 YH |
3399 | if (anycast) |
3400 | rt->rt6i_flags |= RTF_ANYCAST; | |
3401 | else | |
1da177e4 | 3402 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 3403 | |
550bab42 | 3404 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 3405 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 3406 | rt->rt6i_dst.plen = 128; |
ca254490 DA |
3407 | tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL; |
3408 | rt->rt6i_table = fib6_get_table(net, tb_id); | |
1da177e4 | 3409 | |
1da177e4 LT |
3410 | return rt; |
3411 | } | |
3412 | ||
c3968a85 DW |
3413 | /* remove deleted ip from prefsrc entries */ |
3414 | struct arg_dev_net_ip { | |
3415 | struct net_device *dev; | |
3416 | struct net *net; | |
3417 | struct in6_addr *addr; | |
3418 | }; | |
3419 | ||
3420 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
3421 | { | |
3422 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
3423 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
3424 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
3425 | ||
d1918542 | 3426 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
3427 | rt != net->ipv6.ip6_null_entry && |
3428 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
60006a48 | 3429 | spin_lock_bh(&rt6_exception_lock); |
c3968a85 DW |
3430 | /* remove prefsrc entry */ |
3431 | rt->rt6i_prefsrc.plen = 0; | |
60006a48 WW |
3432 | /* need to update cache as well */ |
3433 | rt6_exceptions_remove_prefsrc(rt); | |
3434 | spin_unlock_bh(&rt6_exception_lock); | |
c3968a85 DW |
3435 | } |
3436 | return 0; | |
3437 | } | |
3438 | ||
3439 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
3440 | { | |
3441 | struct net *net = dev_net(ifp->idev->dev); | |
3442 | struct arg_dev_net_ip adni = { | |
3443 | .dev = ifp->idev->dev, | |
3444 | .net = net, | |
3445 | .addr = &ifp->addr, | |
3446 | }; | |
0c3584d5 | 3447 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
3448 | } |
3449 | ||
be7a010d | 3450 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) |
be7a010d DJ |
3451 | |
3452 | /* Remove routers and update dst entries when gateway turn into host. */ | |
3453 | static int fib6_clean_tohost(struct rt6_info *rt, void *arg) | |
3454 | { | |
3455 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
3456 | ||
2b760fcf WW |
3457 | if (((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) && |
3458 | ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { | |
be7a010d DJ |
3459 | return -1; |
3460 | } | |
b16cb459 WW |
3461 | |
3462 | /* Further clean up cached routes in exception table. | |
3463 | * This is needed because cached route may have a different | |
3464 | * gateway than its 'parent' in the case of an ip redirect. | |
3465 | */ | |
3466 | rt6_exceptions_clean_tohost(rt, gateway); | |
3467 | ||
be7a010d DJ |
3468 | return 0; |
3469 | } | |
3470 | ||
3471 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
3472 | { | |
3473 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
3474 | } | |
3475 | ||
2127d95a IS |
3476 | struct arg_netdev_event { |
3477 | const struct net_device *dev; | |
4c981e28 IS |
3478 | union { |
3479 | unsigned int nh_flags; | |
3480 | unsigned long event; | |
3481 | }; | |
2127d95a IS |
3482 | }; |
3483 | ||
d7dedee1 IS |
3484 | static struct rt6_info *rt6_multipath_first_sibling(const struct rt6_info *rt) |
3485 | { | |
3486 | struct rt6_info *iter; | |
3487 | struct fib6_node *fn; | |
3488 | ||
3489 | fn = rcu_dereference_protected(rt->rt6i_node, | |
3490 | lockdep_is_held(&rt->rt6i_table->tb6_lock)); | |
3491 | iter = rcu_dereference_protected(fn->leaf, | |
3492 | lockdep_is_held(&rt->rt6i_table->tb6_lock)); | |
3493 | while (iter) { | |
3494 | if (iter->rt6i_metric == rt->rt6i_metric && | |
3495 | rt6_qualify_for_ecmp(iter)) | |
3496 | return iter; | |
3497 | iter = rcu_dereference_protected(iter->rt6_next, | |
3498 | lockdep_is_held(&rt->rt6i_table->tb6_lock)); | |
3499 | } | |
3500 | ||
3501 | return NULL; | |
3502 | } | |
3503 | ||
3504 | static bool rt6_is_dead(const struct rt6_info *rt) | |
3505 | { | |
3506 | if (rt->rt6i_nh_flags & RTNH_F_DEAD || | |
3507 | (rt->rt6i_nh_flags & RTNH_F_LINKDOWN && | |
3508 | rt->rt6i_idev->cnf.ignore_routes_with_linkdown)) | |
3509 | return true; | |
3510 | ||
3511 | return false; | |
3512 | } | |
3513 | ||
3514 | static int rt6_multipath_total_weight(const struct rt6_info *rt) | |
3515 | { | |
3516 | struct rt6_info *iter; | |
3517 | int total = 0; | |
3518 | ||
3519 | if (!rt6_is_dead(rt)) | |
3520 | total++; | |
3521 | ||
3522 | list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings) { | |
3523 | if (!rt6_is_dead(iter)) | |
3524 | total++; | |
3525 | } | |
3526 | ||
3527 | return total; | |
3528 | } | |
3529 | ||
3530 | static void rt6_upper_bound_set(struct rt6_info *rt, int *weight, int total) | |
3531 | { | |
3532 | int upper_bound = -1; | |
3533 | ||
3534 | if (!rt6_is_dead(rt)) { | |
3535 | (*weight)++; | |
3536 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31, | |
3537 | total) - 1; | |
3538 | } | |
3539 | atomic_set(&rt->rt6i_nh_upper_bound, upper_bound); | |
3540 | } | |
3541 | ||
3542 | static void rt6_multipath_upper_bound_set(struct rt6_info *rt, int total) | |
3543 | { | |
3544 | struct rt6_info *iter; | |
3545 | int weight = 0; | |
3546 | ||
3547 | rt6_upper_bound_set(rt, &weight, total); | |
3548 | ||
3549 | list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings) | |
3550 | rt6_upper_bound_set(iter, &weight, total); | |
3551 | } | |
3552 | ||
3553 | void rt6_multipath_rebalance(struct rt6_info *rt) | |
3554 | { | |
3555 | struct rt6_info *first; | |
3556 | int total; | |
3557 | ||
3558 | /* In case the entire multipath route was marked for flushing, | |
3559 | * then there is no need to rebalance upon the removal of every | |
3560 | * sibling route. | |
3561 | */ | |
3562 | if (!rt->rt6i_nsiblings || rt->should_flush) | |
3563 | return; | |
3564 | ||
3565 | /* During lookup routes are evaluated in order, so we need to | |
3566 | * make sure upper bounds are assigned from the first sibling | |
3567 | * onwards. | |
3568 | */ | |
3569 | first = rt6_multipath_first_sibling(rt); | |
3570 | if (WARN_ON_ONCE(!first)) | |
3571 | return; | |
3572 | ||
3573 | total = rt6_multipath_total_weight(first); | |
3574 | rt6_multipath_upper_bound_set(first, total); | |
3575 | } | |
3576 | ||
2127d95a IS |
3577 | static int fib6_ifup(struct rt6_info *rt, void *p_arg) |
3578 | { | |
3579 | const struct arg_netdev_event *arg = p_arg; | |
3580 | const struct net *net = dev_net(arg->dev); | |
3581 | ||
1de178ed | 3582 | if (rt != net->ipv6.ip6_null_entry && rt->dst.dev == arg->dev) { |
2127d95a | 3583 | rt->rt6i_nh_flags &= ~arg->nh_flags; |
1de178ed | 3584 | fib6_update_sernum_upto_root(dev_net(rt->dst.dev), rt); |
d7dedee1 | 3585 | rt6_multipath_rebalance(rt); |
1de178ed | 3586 | } |
2127d95a IS |
3587 | |
3588 | return 0; | |
3589 | } | |
3590 | ||
3591 | void rt6_sync_up(struct net_device *dev, unsigned int nh_flags) | |
3592 | { | |
3593 | struct arg_netdev_event arg = { | |
3594 | .dev = dev, | |
3595 | .nh_flags = nh_flags, | |
3596 | }; | |
3597 | ||
3598 | if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev)) | |
3599 | arg.nh_flags |= RTNH_F_LINKDOWN; | |
3600 | ||
3601 | fib6_clean_all(dev_net(dev), fib6_ifup, &arg); | |
3602 | } | |
3603 | ||
1de178ed IS |
3604 | static bool rt6_multipath_uses_dev(const struct rt6_info *rt, |
3605 | const struct net_device *dev) | |
3606 | { | |
3607 | struct rt6_info *iter; | |
3608 | ||
3609 | if (rt->dst.dev == dev) | |
3610 | return true; | |
3611 | list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings) | |
3612 | if (iter->dst.dev == dev) | |
3613 | return true; | |
3614 | ||
3615 | return false; | |
3616 | } | |
3617 | ||
3618 | static void rt6_multipath_flush(struct rt6_info *rt) | |
3619 | { | |
3620 | struct rt6_info *iter; | |
3621 | ||
3622 | rt->should_flush = 1; | |
3623 | list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings) | |
3624 | iter->should_flush = 1; | |
3625 | } | |
3626 | ||
3627 | static unsigned int rt6_multipath_dead_count(const struct rt6_info *rt, | |
3628 | const struct net_device *down_dev) | |
3629 | { | |
3630 | struct rt6_info *iter; | |
3631 | unsigned int dead = 0; | |
3632 | ||
3633 | if (rt->dst.dev == down_dev || rt->rt6i_nh_flags & RTNH_F_DEAD) | |
3634 | dead++; | |
3635 | list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings) | |
3636 | if (iter->dst.dev == down_dev || | |
3637 | iter->rt6i_nh_flags & RTNH_F_DEAD) | |
3638 | dead++; | |
3639 | ||
3640 | return dead; | |
3641 | } | |
3642 | ||
3643 | static void rt6_multipath_nh_flags_set(struct rt6_info *rt, | |
3644 | const struct net_device *dev, | |
3645 | unsigned int nh_flags) | |
3646 | { | |
3647 | struct rt6_info *iter; | |
3648 | ||
3649 | if (rt->dst.dev == dev) | |
3650 | rt->rt6i_nh_flags |= nh_flags; | |
3651 | list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings) | |
3652 | if (iter->dst.dev == dev) | |
3653 | iter->rt6i_nh_flags |= nh_flags; | |
3654 | } | |
3655 | ||
a1a22c12 | 3656 | /* called with write lock held for table with rt */ |
4c981e28 | 3657 | static int fib6_ifdown(struct rt6_info *rt, void *p_arg) |
1da177e4 | 3658 | { |
4c981e28 IS |
3659 | const struct arg_netdev_event *arg = p_arg; |
3660 | const struct net_device *dev = arg->dev; | |
3661 | const struct net *net = dev_net(dev); | |
8ed67789 | 3662 | |
1de178ed | 3663 | if (rt == net->ipv6.ip6_null_entry) |
27c6fa73 IS |
3664 | return 0; |
3665 | ||
3666 | switch (arg->event) { | |
3667 | case NETDEV_UNREGISTER: | |
1de178ed | 3668 | return rt->dst.dev == dev ? -1 : 0; |
27c6fa73 | 3669 | case NETDEV_DOWN: |
1de178ed | 3670 | if (rt->should_flush) |
27c6fa73 | 3671 | return -1; |
1de178ed IS |
3672 | if (!rt->rt6i_nsiblings) |
3673 | return rt->dst.dev == dev ? -1 : 0; | |
3674 | if (rt6_multipath_uses_dev(rt, dev)) { | |
3675 | unsigned int count; | |
3676 | ||
3677 | count = rt6_multipath_dead_count(rt, dev); | |
3678 | if (rt->rt6i_nsiblings + 1 == count) { | |
3679 | rt6_multipath_flush(rt); | |
3680 | return -1; | |
3681 | } | |
3682 | rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD | | |
3683 | RTNH_F_LINKDOWN); | |
3684 | fib6_update_sernum(rt); | |
d7dedee1 | 3685 | rt6_multipath_rebalance(rt); |
1de178ed IS |
3686 | } |
3687 | return -2; | |
27c6fa73 | 3688 | case NETDEV_CHANGE: |
1de178ed IS |
3689 | if (rt->dst.dev != dev || |
3690 | rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST)) | |
27c6fa73 IS |
3691 | break; |
3692 | rt->rt6i_nh_flags |= RTNH_F_LINKDOWN; | |
d7dedee1 | 3693 | rt6_multipath_rebalance(rt); |
27c6fa73 | 3694 | break; |
2b241361 | 3695 | } |
c159d30c | 3696 | |
1da177e4 LT |
3697 | return 0; |
3698 | } | |
3699 | ||
27c6fa73 | 3700 | void rt6_sync_down_dev(struct net_device *dev, unsigned long event) |
1da177e4 | 3701 | { |
4c981e28 | 3702 | struct arg_netdev_event arg = { |
8ed67789 | 3703 | .dev = dev, |
4c981e28 | 3704 | .event = event, |
8ed67789 DL |
3705 | }; |
3706 | ||
4c981e28 IS |
3707 | fib6_clean_all(dev_net(dev), fib6_ifdown, &arg); |
3708 | } | |
3709 | ||
3710 | void rt6_disable_ip(struct net_device *dev, unsigned long event) | |
3711 | { | |
3712 | rt6_sync_down_dev(dev, event); | |
3713 | rt6_uncached_list_flush_dev(dev_net(dev), dev); | |
3714 | neigh_ifdown(&nd_tbl, dev); | |
1da177e4 LT |
3715 | } |
3716 | ||
95c96174 | 3717 | struct rt6_mtu_change_arg { |
1da177e4 | 3718 | struct net_device *dev; |
95c96174 | 3719 | unsigned int mtu; |
1da177e4 LT |
3720 | }; |
3721 | ||
3722 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
3723 | { | |
3724 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
3725 | struct inet6_dev *idev; | |
3726 | ||
3727 | /* In IPv6 pmtu discovery is not optional, | |
3728 | so that RTAX_MTU lock cannot disable it. | |
3729 | We still use this lock to block changes | |
3730 | caused by addrconf/ndisc. | |
3731 | */ | |
3732 | ||
3733 | idev = __in6_dev_get(arg->dev); | |
38308473 | 3734 | if (!idev) |
1da177e4 LT |
3735 | return 0; |
3736 | ||
3737 | /* For administrative MTU increase, there is no way to discover | |
3738 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
3739 | Since RFC 1981 doesn't include administrative MTU increase | |
3740 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
3741 | */ | |
3742 | /* | |
3743 | If new MTU is less than route PMTU, this new MTU will be the | |
3744 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
3745 | decreases; if new MTU is greater than route PMTU, and the | |
3746 | old MTU is the lowest MTU in the path, update the route PMTU | |
3747 | to reflect the increase. In this case if the other nodes' MTU | |
3748 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
67c408cf | 3749 | PMTU discovery. |
1da177e4 | 3750 | */ |
d1918542 | 3751 | if (rt->dst.dev == arg->dev && |
fb56be83 | 3752 | dst_metric_raw(&rt->dst, RTAX_MTU) && |
4b32b5ad | 3753 | !dst_metric_locked(&rt->dst, RTAX_MTU)) { |
f5bbe7ee | 3754 | spin_lock_bh(&rt6_exception_lock); |
2b760fcf WW |
3755 | if (dst_mtu(&rt->dst) >= arg->mtu || |
3756 | (dst_mtu(&rt->dst) < arg->mtu && | |
3757 | dst_mtu(&rt->dst) == idev->cnf.mtu6)) { | |
4b32b5ad MKL |
3758 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
3759 | } | |
f5bbe7ee WW |
3760 | rt6_exceptions_update_pmtu(rt, arg->mtu); |
3761 | spin_unlock_bh(&rt6_exception_lock); | |
566cfd8f | 3762 | } |
1da177e4 LT |
3763 | return 0; |
3764 | } | |
3765 | ||
95c96174 | 3766 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 3767 | { |
c71099ac TG |
3768 | struct rt6_mtu_change_arg arg = { |
3769 | .dev = dev, | |
3770 | .mtu = mtu, | |
3771 | }; | |
1da177e4 | 3772 | |
0c3584d5 | 3773 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
3774 | } |
3775 | ||
ef7c79ed | 3776 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 3777 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 3778 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 3779 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
3780 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
3781 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 3782 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 3783 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
3784 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
3785 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 3786 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
622ec2c9 | 3787 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 3788 | [RTA_MARK] = { .type = NLA_U32 }, |
86872cb5 TG |
3789 | }; |
3790 | ||
3791 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
333c4301 DA |
3792 | struct fib6_config *cfg, |
3793 | struct netlink_ext_ack *extack) | |
1da177e4 | 3794 | { |
86872cb5 TG |
3795 | struct rtmsg *rtm; |
3796 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 3797 | unsigned int pref; |
86872cb5 | 3798 | int err; |
1da177e4 | 3799 | |
fceb6435 JB |
3800 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy, |
3801 | NULL); | |
86872cb5 TG |
3802 | if (err < 0) |
3803 | goto errout; | |
1da177e4 | 3804 | |
86872cb5 TG |
3805 | err = -EINVAL; |
3806 | rtm = nlmsg_data(nlh); | |
3807 | memset(cfg, 0, sizeof(*cfg)); | |
3808 | ||
3809 | cfg->fc_table = rtm->rtm_table; | |
3810 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
3811 | cfg->fc_src_len = rtm->rtm_src_len; | |
3812 | cfg->fc_flags = RTF_UP; | |
3813 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 3814 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 3815 | |
ef2c7d7b ND |
3816 | if (rtm->rtm_type == RTN_UNREACHABLE || |
3817 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
3818 | rtm->rtm_type == RTN_PROHIBIT || |
3819 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
3820 | cfg->fc_flags |= RTF_REJECT; |
3821 | ||
ab79ad14 MŻ |
3822 | if (rtm->rtm_type == RTN_LOCAL) |
3823 | cfg->fc_flags |= RTF_LOCAL; | |
3824 | ||
1f56a01f MKL |
3825 | if (rtm->rtm_flags & RTM_F_CLONED) |
3826 | cfg->fc_flags |= RTF_CACHE; | |
3827 | ||
15e47304 | 3828 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 3829 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 3830 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
3831 | |
3832 | if (tb[RTA_GATEWAY]) { | |
67b61f6c | 3833 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 3834 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 3835 | } |
86872cb5 TG |
3836 | |
3837 | if (tb[RTA_DST]) { | |
3838 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
3839 | ||
3840 | if (nla_len(tb[RTA_DST]) < plen) | |
3841 | goto errout; | |
3842 | ||
3843 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 3844 | } |
86872cb5 TG |
3845 | |
3846 | if (tb[RTA_SRC]) { | |
3847 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
3848 | ||
3849 | if (nla_len(tb[RTA_SRC]) < plen) | |
3850 | goto errout; | |
3851 | ||
3852 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 3853 | } |
86872cb5 | 3854 | |
c3968a85 | 3855 | if (tb[RTA_PREFSRC]) |
67b61f6c | 3856 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 3857 | |
86872cb5 TG |
3858 | if (tb[RTA_OIF]) |
3859 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
3860 | ||
3861 | if (tb[RTA_PRIORITY]) | |
3862 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
3863 | ||
3864 | if (tb[RTA_METRICS]) { | |
3865 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
3866 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 3867 | } |
86872cb5 TG |
3868 | |
3869 | if (tb[RTA_TABLE]) | |
3870 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
3871 | ||
51ebd318 ND |
3872 | if (tb[RTA_MULTIPATH]) { |
3873 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
3874 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
9ed59592 DA |
3875 | |
3876 | err = lwtunnel_valid_encap_type_attr(cfg->fc_mp, | |
c255bd68 | 3877 | cfg->fc_mp_len, extack); |
9ed59592 DA |
3878 | if (err < 0) |
3879 | goto errout; | |
51ebd318 ND |
3880 | } |
3881 | ||
c78ba6d6 LR |
3882 | if (tb[RTA_PREF]) { |
3883 | pref = nla_get_u8(tb[RTA_PREF]); | |
3884 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
3885 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
3886 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
3887 | cfg->fc_flags |= RTF_PREF(pref); | |
3888 | } | |
3889 | ||
19e42e45 RP |
3890 | if (tb[RTA_ENCAP]) |
3891 | cfg->fc_encap = tb[RTA_ENCAP]; | |
3892 | ||
9ed59592 | 3893 | if (tb[RTA_ENCAP_TYPE]) { |
19e42e45 RP |
3894 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); |
3895 | ||
c255bd68 | 3896 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack); |
9ed59592 DA |
3897 | if (err < 0) |
3898 | goto errout; | |
3899 | } | |
3900 | ||
32bc201e XL |
3901 | if (tb[RTA_EXPIRES]) { |
3902 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
3903 | ||
3904 | if (addrconf_finite_timeout(timeout)) { | |
3905 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
3906 | cfg->fc_flags |= RTF_EXPIRES; | |
3907 | } | |
3908 | } | |
3909 | ||
86872cb5 TG |
3910 | err = 0; |
3911 | errout: | |
3912 | return err; | |
1da177e4 LT |
3913 | } |
3914 | ||
6b9ea5a6 RP |
3915 | struct rt6_nh { |
3916 | struct rt6_info *rt6_info; | |
3917 | struct fib6_config r_cfg; | |
3918 | struct mx6_config mxc; | |
3919 | struct list_head next; | |
3920 | }; | |
3921 | ||
3922 | static void ip6_print_replace_route_err(struct list_head *rt6_nh_list) | |
3923 | { | |
3924 | struct rt6_nh *nh; | |
3925 | ||
3926 | list_for_each_entry(nh, rt6_nh_list, next) { | |
7d4d5065 | 3927 | pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6c nexthop %pI6c ifi %d\n", |
6b9ea5a6 RP |
3928 | &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway, |
3929 | nh->r_cfg.fc_ifindex); | |
3930 | } | |
3931 | } | |
3932 | ||
3933 | static int ip6_route_info_append(struct list_head *rt6_nh_list, | |
3934 | struct rt6_info *rt, struct fib6_config *r_cfg) | |
3935 | { | |
3936 | struct rt6_nh *nh; | |
6b9ea5a6 RP |
3937 | int err = -EEXIST; |
3938 | ||
3939 | list_for_each_entry(nh, rt6_nh_list, next) { | |
3940 | /* check if rt6_info already exists */ | |
f06b7549 | 3941 | if (rt6_duplicate_nexthop(nh->rt6_info, rt)) |
6b9ea5a6 RP |
3942 | return err; |
3943 | } | |
3944 | ||
3945 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
3946 | if (!nh) | |
3947 | return -ENOMEM; | |
3948 | nh->rt6_info = rt; | |
3949 | err = ip6_convert_metrics(&nh->mxc, r_cfg); | |
3950 | if (err) { | |
3951 | kfree(nh); | |
3952 | return err; | |
3953 | } | |
3954 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); | |
3955 | list_add_tail(&nh->next, rt6_nh_list); | |
3956 | ||
3957 | return 0; | |
3958 | } | |
3959 | ||
3b1137fe DA |
3960 | static void ip6_route_mpath_notify(struct rt6_info *rt, |
3961 | struct rt6_info *rt_last, | |
3962 | struct nl_info *info, | |
3963 | __u16 nlflags) | |
3964 | { | |
3965 | /* if this is an APPEND route, then rt points to the first route | |
3966 | * inserted and rt_last points to last route inserted. Userspace | |
3967 | * wants a consistent dump of the route which starts at the first | |
3968 | * nexthop. Since sibling routes are always added at the end of | |
3969 | * the list, find the first sibling of the last route appended | |
3970 | */ | |
3971 | if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->rt6i_nsiblings) { | |
3972 | rt = list_first_entry(&rt_last->rt6i_siblings, | |
3973 | struct rt6_info, | |
3974 | rt6i_siblings); | |
3975 | } | |
3976 | ||
3977 | if (rt) | |
3978 | inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags); | |
3979 | } | |
3980 | ||
333c4301 DA |
3981 | static int ip6_route_multipath_add(struct fib6_config *cfg, |
3982 | struct netlink_ext_ack *extack) | |
51ebd318 | 3983 | { |
3b1137fe DA |
3984 | struct rt6_info *rt_notif = NULL, *rt_last = NULL; |
3985 | struct nl_info *info = &cfg->fc_nlinfo; | |
51ebd318 ND |
3986 | struct fib6_config r_cfg; |
3987 | struct rtnexthop *rtnh; | |
6b9ea5a6 RP |
3988 | struct rt6_info *rt; |
3989 | struct rt6_nh *err_nh; | |
3990 | struct rt6_nh *nh, *nh_safe; | |
3b1137fe | 3991 | __u16 nlflags; |
51ebd318 ND |
3992 | int remaining; |
3993 | int attrlen; | |
6b9ea5a6 RP |
3994 | int err = 1; |
3995 | int nhn = 0; | |
3996 | int replace = (cfg->fc_nlinfo.nlh && | |
3997 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
3998 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 3999 | |
3b1137fe DA |
4000 | nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE; |
4001 | if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND) | |
4002 | nlflags |= NLM_F_APPEND; | |
4003 | ||
35f1b4e9 | 4004 | remaining = cfg->fc_mp_len; |
51ebd318 | 4005 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 4006 | |
6b9ea5a6 RP |
4007 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
4008 | * rt6_info structs per nexthop | |
4009 | */ | |
51ebd318 ND |
4010 | while (rtnh_ok(rtnh, remaining)) { |
4011 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
4012 | if (rtnh->rtnh_ifindex) | |
4013 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
4014 | ||
4015 | attrlen = rtnh_attrlen(rtnh); | |
4016 | if (attrlen > 0) { | |
4017 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
4018 | ||
4019 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
4020 | if (nla) { | |
67b61f6c | 4021 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
4022 | r_cfg.fc_flags |= RTF_GATEWAY; |
4023 | } | |
19e42e45 RP |
4024 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
4025 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
4026 | if (nla) | |
4027 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 4028 | } |
6b9ea5a6 | 4029 | |
333c4301 | 4030 | rt = ip6_route_info_create(&r_cfg, extack); |
8c5b83f0 RP |
4031 | if (IS_ERR(rt)) { |
4032 | err = PTR_ERR(rt); | |
4033 | rt = NULL; | |
6b9ea5a6 | 4034 | goto cleanup; |
8c5b83f0 | 4035 | } |
6b9ea5a6 RP |
4036 | |
4037 | err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg); | |
51ebd318 | 4038 | if (err) { |
587fea74 | 4039 | dst_release_immediate(&rt->dst); |
6b9ea5a6 RP |
4040 | goto cleanup; |
4041 | } | |
4042 | ||
4043 | rtnh = rtnh_next(rtnh, &remaining); | |
4044 | } | |
4045 | ||
3b1137fe DA |
4046 | /* for add and replace send one notification with all nexthops. |
4047 | * Skip the notification in fib6_add_rt2node and send one with | |
4048 | * the full route when done | |
4049 | */ | |
4050 | info->skip_notify = 1; | |
4051 | ||
6b9ea5a6 RP |
4052 | err_nh = NULL; |
4053 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
3b1137fe | 4054 | rt_last = nh->rt6_info; |
333c4301 | 4055 | err = __ip6_ins_rt(nh->rt6_info, info, &nh->mxc, extack); |
3b1137fe DA |
4056 | /* save reference to first route for notification */ |
4057 | if (!rt_notif && !err) | |
4058 | rt_notif = nh->rt6_info; | |
4059 | ||
6b9ea5a6 RP |
4060 | /* nh->rt6_info is used or freed at this point, reset to NULL*/ |
4061 | nh->rt6_info = NULL; | |
4062 | if (err) { | |
4063 | if (replace && nhn) | |
4064 | ip6_print_replace_route_err(&rt6_nh_list); | |
4065 | err_nh = nh; | |
4066 | goto add_errout; | |
51ebd318 | 4067 | } |
6b9ea5a6 | 4068 | |
1a72418b | 4069 | /* Because each route is added like a single route we remove |
27596472 MK |
4070 | * these flags after the first nexthop: if there is a collision, |
4071 | * we have already failed to add the first nexthop: | |
4072 | * fib6_add_rt2node() has rejected it; when replacing, old | |
4073 | * nexthops have been replaced by first new, the rest should | |
4074 | * be added to it. | |
1a72418b | 4075 | */ |
27596472 MK |
4076 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
4077 | NLM_F_REPLACE); | |
6b9ea5a6 RP |
4078 | nhn++; |
4079 | } | |
4080 | ||
3b1137fe DA |
4081 | /* success ... tell user about new route */ |
4082 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
6b9ea5a6 RP |
4083 | goto cleanup; |
4084 | ||
4085 | add_errout: | |
3b1137fe DA |
4086 | /* send notification for routes that were added so that |
4087 | * the delete notifications sent by ip6_route_del are | |
4088 | * coherent | |
4089 | */ | |
4090 | if (rt_notif) | |
4091 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
4092 | ||
6b9ea5a6 RP |
4093 | /* Delete routes that were already added */ |
4094 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
4095 | if (err_nh == nh) | |
4096 | break; | |
333c4301 | 4097 | ip6_route_del(&nh->r_cfg, extack); |
6b9ea5a6 RP |
4098 | } |
4099 | ||
4100 | cleanup: | |
4101 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
587fea74 WW |
4102 | if (nh->rt6_info) |
4103 | dst_release_immediate(&nh->rt6_info->dst); | |
52fe51f8 | 4104 | kfree(nh->mxc.mx); |
6b9ea5a6 RP |
4105 | list_del(&nh->next); |
4106 | kfree(nh); | |
4107 | } | |
4108 | ||
4109 | return err; | |
4110 | } | |
4111 | ||
333c4301 DA |
4112 | static int ip6_route_multipath_del(struct fib6_config *cfg, |
4113 | struct netlink_ext_ack *extack) | |
6b9ea5a6 RP |
4114 | { |
4115 | struct fib6_config r_cfg; | |
4116 | struct rtnexthop *rtnh; | |
4117 | int remaining; | |
4118 | int attrlen; | |
4119 | int err = 1, last_err = 0; | |
4120 | ||
4121 | remaining = cfg->fc_mp_len; | |
4122 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
4123 | ||
4124 | /* Parse a Multipath Entry */ | |
4125 | while (rtnh_ok(rtnh, remaining)) { | |
4126 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
4127 | if (rtnh->rtnh_ifindex) | |
4128 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
4129 | ||
4130 | attrlen = rtnh_attrlen(rtnh); | |
4131 | if (attrlen > 0) { | |
4132 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
4133 | ||
4134 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
4135 | if (nla) { | |
4136 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
4137 | r_cfg.fc_flags |= RTF_GATEWAY; | |
4138 | } | |
4139 | } | |
333c4301 | 4140 | err = ip6_route_del(&r_cfg, extack); |
6b9ea5a6 RP |
4141 | if (err) |
4142 | last_err = err; | |
4143 | ||
51ebd318 ND |
4144 | rtnh = rtnh_next(rtnh, &remaining); |
4145 | } | |
4146 | ||
4147 | return last_err; | |
4148 | } | |
4149 | ||
c21ef3e3 DA |
4150 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
4151 | struct netlink_ext_ack *extack) | |
1da177e4 | 4152 | { |
86872cb5 TG |
4153 | struct fib6_config cfg; |
4154 | int err; | |
1da177e4 | 4155 | |
333c4301 | 4156 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
4157 | if (err < 0) |
4158 | return err; | |
4159 | ||
51ebd318 | 4160 | if (cfg.fc_mp) |
333c4301 | 4161 | return ip6_route_multipath_del(&cfg, extack); |
0ae81335 DA |
4162 | else { |
4163 | cfg.fc_delete_all_nh = 1; | |
333c4301 | 4164 | return ip6_route_del(&cfg, extack); |
0ae81335 | 4165 | } |
1da177e4 LT |
4166 | } |
4167 | ||
c21ef3e3 DA |
4168 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
4169 | struct netlink_ext_ack *extack) | |
1da177e4 | 4170 | { |
86872cb5 TG |
4171 | struct fib6_config cfg; |
4172 | int err; | |
1da177e4 | 4173 | |
333c4301 | 4174 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
4175 | if (err < 0) |
4176 | return err; | |
4177 | ||
51ebd318 | 4178 | if (cfg.fc_mp) |
333c4301 | 4179 | return ip6_route_multipath_add(&cfg, extack); |
51ebd318 | 4180 | else |
333c4301 | 4181 | return ip6_route_add(&cfg, extack); |
1da177e4 LT |
4182 | } |
4183 | ||
beb1afac | 4184 | static size_t rt6_nlmsg_size(struct rt6_info *rt) |
339bf98f | 4185 | { |
beb1afac DA |
4186 | int nexthop_len = 0; |
4187 | ||
4188 | if (rt->rt6i_nsiblings) { | |
4189 | nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */ | |
4190 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
4191 | + nla_total_size(16) /* RTA_GATEWAY */ | |
beb1afac DA |
4192 | + lwtunnel_get_encap_size(rt->dst.lwtstate); |
4193 | ||
4194 | nexthop_len *= rt->rt6i_nsiblings; | |
4195 | } | |
4196 | ||
339bf98f TG |
4197 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
4198 | + nla_total_size(16) /* RTA_SRC */ | |
4199 | + nla_total_size(16) /* RTA_DST */ | |
4200 | + nla_total_size(16) /* RTA_GATEWAY */ | |
4201 | + nla_total_size(16) /* RTA_PREFSRC */ | |
4202 | + nla_total_size(4) /* RTA_TABLE */ | |
4203 | + nla_total_size(4) /* RTA_IIF */ | |
4204 | + nla_total_size(4) /* RTA_OIF */ | |
4205 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 4206 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 4207 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 4208 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 4209 | + nla_total_size(1) /* RTA_PREF */ |
beb1afac DA |
4210 | + lwtunnel_get_encap_size(rt->dst.lwtstate) |
4211 | + nexthop_len; | |
4212 | } | |
4213 | ||
4214 | static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt, | |
5be083ce | 4215 | unsigned int *flags, bool skip_oif) |
beb1afac | 4216 | { |
f9d882ea IS |
4217 | if (rt->rt6i_nh_flags & RTNH_F_DEAD) |
4218 | *flags |= RTNH_F_DEAD; | |
4219 | ||
44c9f2f2 | 4220 | if (rt->rt6i_nh_flags & RTNH_F_LINKDOWN) { |
beb1afac DA |
4221 | *flags |= RTNH_F_LINKDOWN; |
4222 | if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown) | |
4223 | *flags |= RTNH_F_DEAD; | |
4224 | } | |
4225 | ||
4226 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
4227 | if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0) | |
4228 | goto nla_put_failure; | |
4229 | } | |
4230 | ||
fe400799 | 4231 | if (rt->rt6i_nh_flags & RTNH_F_OFFLOAD) |
61e4d01e IS |
4232 | *flags |= RTNH_F_OFFLOAD; |
4233 | ||
5be083ce DA |
4234 | /* not needed for multipath encoding b/c it has a rtnexthop struct */ |
4235 | if (!skip_oif && rt->dst.dev && | |
beb1afac DA |
4236 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) |
4237 | goto nla_put_failure; | |
4238 | ||
4239 | if (rt->dst.lwtstate && | |
4240 | lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0) | |
4241 | goto nla_put_failure; | |
4242 | ||
4243 | return 0; | |
4244 | ||
4245 | nla_put_failure: | |
4246 | return -EMSGSIZE; | |
4247 | } | |
4248 | ||
5be083ce | 4249 | /* add multipath next hop */ |
beb1afac DA |
4250 | static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt) |
4251 | { | |
4252 | struct rtnexthop *rtnh; | |
4253 | unsigned int flags = 0; | |
4254 | ||
4255 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); | |
4256 | if (!rtnh) | |
4257 | goto nla_put_failure; | |
4258 | ||
4259 | rtnh->rtnh_hops = 0; | |
4260 | rtnh->rtnh_ifindex = rt->dst.dev ? rt->dst.dev->ifindex : 0; | |
4261 | ||
5be083ce | 4262 | if (rt6_nexthop_info(skb, rt, &flags, true) < 0) |
beb1afac DA |
4263 | goto nla_put_failure; |
4264 | ||
4265 | rtnh->rtnh_flags = flags; | |
4266 | ||
4267 | /* length of rtnetlink header + attributes */ | |
4268 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; | |
4269 | ||
4270 | return 0; | |
4271 | ||
4272 | nla_put_failure: | |
4273 | return -EMSGSIZE; | |
339bf98f TG |
4274 | } |
4275 | ||
191cd582 BH |
4276 | static int rt6_fill_node(struct net *net, |
4277 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 4278 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 4279 | int iif, int type, u32 portid, u32 seq, |
f8cfe2ce | 4280 | unsigned int flags) |
1da177e4 | 4281 | { |
4b32b5ad | 4282 | u32 metrics[RTAX_MAX]; |
1da177e4 | 4283 | struct rtmsg *rtm; |
2d7202bf | 4284 | struct nlmsghdr *nlh; |
e3703b3d | 4285 | long expires; |
9e762a4a | 4286 | u32 table; |
1da177e4 | 4287 | |
15e47304 | 4288 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 4289 | if (!nlh) |
26932566 | 4290 | return -EMSGSIZE; |
2d7202bf TG |
4291 | |
4292 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
4293 | rtm->rtm_family = AF_INET6; |
4294 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
4295 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
4296 | rtm->rtm_tos = 0; | |
c71099ac | 4297 | if (rt->rt6i_table) |
9e762a4a | 4298 | table = rt->rt6i_table->tb6_id; |
c71099ac | 4299 | else |
9e762a4a PM |
4300 | table = RT6_TABLE_UNSPEC; |
4301 | rtm->rtm_table = table; | |
c78679e8 DM |
4302 | if (nla_put_u32(skb, RTA_TABLE, table)) |
4303 | goto nla_put_failure; | |
ef2c7d7b ND |
4304 | if (rt->rt6i_flags & RTF_REJECT) { |
4305 | switch (rt->dst.error) { | |
4306 | case -EINVAL: | |
4307 | rtm->rtm_type = RTN_BLACKHOLE; | |
4308 | break; | |
4309 | case -EACCES: | |
4310 | rtm->rtm_type = RTN_PROHIBIT; | |
4311 | break; | |
b4949ab2 ND |
4312 | case -EAGAIN: |
4313 | rtm->rtm_type = RTN_THROW; | |
4314 | break; | |
ef2c7d7b ND |
4315 | default: |
4316 | rtm->rtm_type = RTN_UNREACHABLE; | |
4317 | break; | |
4318 | } | |
4319 | } | |
38308473 | 4320 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 4321 | rtm->rtm_type = RTN_LOCAL; |
4ee39733 DA |
4322 | else if (rt->rt6i_flags & RTF_ANYCAST) |
4323 | rtm->rtm_type = RTN_ANYCAST; | |
d1918542 | 4324 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
4325 | rtm->rtm_type = RTN_LOCAL; |
4326 | else | |
4327 | rtm->rtm_type = RTN_UNICAST; | |
4328 | rtm->rtm_flags = 0; | |
4329 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
4330 | rtm->rtm_protocol = rt->rt6i_protocol; | |
1da177e4 | 4331 | |
38308473 | 4332 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
4333 | rtm->rtm_flags |= RTM_F_CLONED; |
4334 | ||
4335 | if (dst) { | |
930345ea | 4336 | if (nla_put_in6_addr(skb, RTA_DST, dst)) |
c78679e8 | 4337 | goto nla_put_failure; |
1ab1457c | 4338 | rtm->rtm_dst_len = 128; |
1da177e4 | 4339 | } else if (rtm->rtm_dst_len) |
930345ea | 4340 | if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr)) |
c78679e8 | 4341 | goto nla_put_failure; |
1da177e4 LT |
4342 | #ifdef CONFIG_IPV6_SUBTREES |
4343 | if (src) { | |
930345ea | 4344 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 4345 | goto nla_put_failure; |
1ab1457c | 4346 | rtm->rtm_src_len = 128; |
c78679e8 | 4347 | } else if (rtm->rtm_src_len && |
930345ea | 4348 | nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr)) |
c78679e8 | 4349 | goto nla_put_failure; |
1da177e4 | 4350 | #endif |
7bc570c8 YH |
4351 | if (iif) { |
4352 | #ifdef CONFIG_IPV6_MROUTE | |
4353 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
fd61c6ba DA |
4354 | int err = ip6mr_get_route(net, skb, rtm, portid); |
4355 | ||
4356 | if (err == 0) | |
4357 | return 0; | |
4358 | if (err < 0) | |
4359 | goto nla_put_failure; | |
7bc570c8 YH |
4360 | } else |
4361 | #endif | |
c78679e8 DM |
4362 | if (nla_put_u32(skb, RTA_IIF, iif)) |
4363 | goto nla_put_failure; | |
7bc570c8 | 4364 | } else if (dst) { |
1da177e4 | 4365 | struct in6_addr saddr_buf; |
c78679e8 | 4366 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
930345ea | 4367 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 4368 | goto nla_put_failure; |
1da177e4 | 4369 | } |
2d7202bf | 4370 | |
c3968a85 DW |
4371 | if (rt->rt6i_prefsrc.plen) { |
4372 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 4373 | saddr_buf = rt->rt6i_prefsrc.addr; |
930345ea | 4374 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 4375 | goto nla_put_failure; |
c3968a85 DW |
4376 | } |
4377 | ||
4b32b5ad MKL |
4378 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
4379 | if (rt->rt6i_pmtu) | |
4380 | metrics[RTAX_MTU - 1] = rt->rt6i_pmtu; | |
4381 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
2d7202bf TG |
4382 | goto nla_put_failure; |
4383 | ||
c78679e8 DM |
4384 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) |
4385 | goto nla_put_failure; | |
8253947e | 4386 | |
beb1afac DA |
4387 | /* For multipath routes, walk the siblings list and add |
4388 | * each as a nexthop within RTA_MULTIPATH. | |
4389 | */ | |
4390 | if (rt->rt6i_nsiblings) { | |
4391 | struct rt6_info *sibling, *next_sibling; | |
4392 | struct nlattr *mp; | |
4393 | ||
4394 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
4395 | if (!mp) | |
4396 | goto nla_put_failure; | |
4397 | ||
4398 | if (rt6_add_nexthop(skb, rt) < 0) | |
4399 | goto nla_put_failure; | |
4400 | ||
4401 | list_for_each_entry_safe(sibling, next_sibling, | |
4402 | &rt->rt6i_siblings, rt6i_siblings) { | |
4403 | if (rt6_add_nexthop(skb, sibling) < 0) | |
4404 | goto nla_put_failure; | |
4405 | } | |
4406 | ||
4407 | nla_nest_end(skb, mp); | |
4408 | } else { | |
5be083ce | 4409 | if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags, false) < 0) |
beb1afac DA |
4410 | goto nla_put_failure; |
4411 | } | |
4412 | ||
8253947e | 4413 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; |
69cdf8f9 | 4414 | |
87a50699 | 4415 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 4416 | goto nla_put_failure; |
2d7202bf | 4417 | |
c78ba6d6 LR |
4418 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags))) |
4419 | goto nla_put_failure; | |
4420 | ||
19e42e45 | 4421 | |
053c095a JB |
4422 | nlmsg_end(skb, nlh); |
4423 | return 0; | |
2d7202bf TG |
4424 | |
4425 | nla_put_failure: | |
26932566 PM |
4426 | nlmsg_cancel(skb, nlh); |
4427 | return -EMSGSIZE; | |
1da177e4 LT |
4428 | } |
4429 | ||
1b43af54 | 4430 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
4431 | { |
4432 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
1f17e2f2 DA |
4433 | struct net *net = arg->net; |
4434 | ||
4435 | if (rt == net->ipv6.ip6_null_entry) | |
4436 | return 0; | |
1da177e4 | 4437 | |
2d7202bf TG |
4438 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
4439 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
f8cfe2ce DA |
4440 | |
4441 | /* user wants prefix routes only */ | |
4442 | if (rtm->rtm_flags & RTM_F_PREFIX && | |
4443 | !(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
4444 | /* success since this is not a prefix route */ | |
4445 | return 1; | |
4446 | } | |
4447 | } | |
1da177e4 | 4448 | |
1f17e2f2 | 4449 | return rt6_fill_node(net, |
191cd582 | 4450 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, |
15e47304 | 4451 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
f8cfe2ce | 4452 | NLM_F_MULTI); |
1da177e4 LT |
4453 | } |
4454 | ||
c21ef3e3 DA |
4455 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
4456 | struct netlink_ext_ack *extack) | |
1da177e4 | 4457 | { |
3b1e0a65 | 4458 | struct net *net = sock_net(in_skb->sk); |
ab364a6f | 4459 | struct nlattr *tb[RTA_MAX+1]; |
18c3a61c RP |
4460 | int err, iif = 0, oif = 0; |
4461 | struct dst_entry *dst; | |
ab364a6f | 4462 | struct rt6_info *rt; |
1da177e4 | 4463 | struct sk_buff *skb; |
ab364a6f | 4464 | struct rtmsg *rtm; |
4c9483b2 | 4465 | struct flowi6 fl6; |
18c3a61c | 4466 | bool fibmatch; |
1da177e4 | 4467 | |
fceb6435 | 4468 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy, |
c21ef3e3 | 4469 | extack); |
ab364a6f TG |
4470 | if (err < 0) |
4471 | goto errout; | |
1da177e4 | 4472 | |
ab364a6f | 4473 | err = -EINVAL; |
4c9483b2 | 4474 | memset(&fl6, 0, sizeof(fl6)); |
38b7097b HFS |
4475 | rtm = nlmsg_data(nlh); |
4476 | fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0); | |
18c3a61c | 4477 | fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH); |
1da177e4 | 4478 | |
ab364a6f TG |
4479 | if (tb[RTA_SRC]) { |
4480 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
4481 | goto errout; | |
4482 | ||
4e3fd7a0 | 4483 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
4484 | } |
4485 | ||
4486 | if (tb[RTA_DST]) { | |
4487 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
4488 | goto errout; | |
4489 | ||
4e3fd7a0 | 4490 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
4491 | } |
4492 | ||
4493 | if (tb[RTA_IIF]) | |
4494 | iif = nla_get_u32(tb[RTA_IIF]); | |
4495 | ||
4496 | if (tb[RTA_OIF]) | |
72331bc0 | 4497 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 4498 | |
2e47b291 LC |
4499 | if (tb[RTA_MARK]) |
4500 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
4501 | ||
622ec2c9 LC |
4502 | if (tb[RTA_UID]) |
4503 | fl6.flowi6_uid = make_kuid(current_user_ns(), | |
4504 | nla_get_u32(tb[RTA_UID])); | |
4505 | else | |
4506 | fl6.flowi6_uid = iif ? INVALID_UID : current_uid(); | |
4507 | ||
1da177e4 LT |
4508 | if (iif) { |
4509 | struct net_device *dev; | |
72331bc0 SL |
4510 | int flags = 0; |
4511 | ||
121622db FW |
4512 | rcu_read_lock(); |
4513 | ||
4514 | dev = dev_get_by_index_rcu(net, iif); | |
1da177e4 | 4515 | if (!dev) { |
121622db | 4516 | rcu_read_unlock(); |
1da177e4 | 4517 | err = -ENODEV; |
ab364a6f | 4518 | goto errout; |
1da177e4 | 4519 | } |
72331bc0 SL |
4520 | |
4521 | fl6.flowi6_iif = iif; | |
4522 | ||
4523 | if (!ipv6_addr_any(&fl6.saddr)) | |
4524 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
4525 | ||
58acfd71 | 4526 | dst = ip6_route_input_lookup(net, dev, &fl6, flags); |
121622db FW |
4527 | |
4528 | rcu_read_unlock(); | |
72331bc0 SL |
4529 | } else { |
4530 | fl6.flowi6_oif = oif; | |
4531 | ||
58acfd71 | 4532 | dst = ip6_route_output(net, NULL, &fl6); |
18c3a61c RP |
4533 | } |
4534 | ||
18c3a61c RP |
4535 | |
4536 | rt = container_of(dst, struct rt6_info, dst); | |
4537 | if (rt->dst.error) { | |
4538 | err = rt->dst.error; | |
4539 | ip6_rt_put(rt); | |
4540 | goto errout; | |
1da177e4 LT |
4541 | } |
4542 | ||
9d6acb3b WC |
4543 | if (rt == net->ipv6.ip6_null_entry) { |
4544 | err = rt->dst.error; | |
4545 | ip6_rt_put(rt); | |
4546 | goto errout; | |
4547 | } | |
4548 | ||
fba961ab DM |
4549 | if (fibmatch && rt->from) { |
4550 | struct rt6_info *ort = rt->from; | |
58acfd71 IS |
4551 | |
4552 | dst_hold(&ort->dst); | |
4553 | ip6_rt_put(rt); | |
4554 | rt = ort; | |
4555 | } | |
4556 | ||
ab364a6f | 4557 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 4558 | if (!skb) { |
94e187c0 | 4559 | ip6_rt_put(rt); |
ab364a6f TG |
4560 | err = -ENOBUFS; |
4561 | goto errout; | |
4562 | } | |
1da177e4 | 4563 | |
d8d1f30b | 4564 | skb_dst_set(skb, &rt->dst); |
18c3a61c RP |
4565 | if (fibmatch) |
4566 | err = rt6_fill_node(net, skb, rt, NULL, NULL, iif, | |
4567 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, | |
4568 | nlh->nlmsg_seq, 0); | |
4569 | else | |
4570 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, | |
4571 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, | |
4572 | nlh->nlmsg_seq, 0); | |
1da177e4 | 4573 | if (err < 0) { |
ab364a6f TG |
4574 | kfree_skb(skb); |
4575 | goto errout; | |
1da177e4 LT |
4576 | } |
4577 | ||
15e47304 | 4578 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 4579 | errout: |
1da177e4 | 4580 | return err; |
1da177e4 LT |
4581 | } |
4582 | ||
37a1d361 RP |
4583 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info, |
4584 | unsigned int nlm_flags) | |
1da177e4 LT |
4585 | { |
4586 | struct sk_buff *skb; | |
5578689a | 4587 | struct net *net = info->nl_net; |
528c4ceb DL |
4588 | u32 seq; |
4589 | int err; | |
4590 | ||
4591 | err = -ENOBUFS; | |
38308473 | 4592 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 4593 | |
19e42e45 | 4594 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 4595 | if (!skb) |
21713ebc TG |
4596 | goto errout; |
4597 | ||
191cd582 | 4598 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
f8cfe2ce | 4599 | event, info->portid, seq, nlm_flags); |
26932566 PM |
4600 | if (err < 0) { |
4601 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
4602 | WARN_ON(err == -EMSGSIZE); | |
4603 | kfree_skb(skb); | |
4604 | goto errout; | |
4605 | } | |
15e47304 | 4606 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
4607 | info->nlh, gfp_any()); |
4608 | return; | |
21713ebc TG |
4609 | errout: |
4610 | if (err < 0) | |
5578689a | 4611 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
4612 | } |
4613 | ||
8ed67789 | 4614 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 4615 | unsigned long event, void *ptr) |
8ed67789 | 4616 | { |
351638e7 | 4617 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 4618 | struct net *net = dev_net(dev); |
8ed67789 | 4619 | |
242d3a49 WC |
4620 | if (!(dev->flags & IFF_LOOPBACK)) |
4621 | return NOTIFY_OK; | |
4622 | ||
4623 | if (event == NETDEV_REGISTER) { | |
d8d1f30b | 4624 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
4625 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
4626 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 4627 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 4628 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 4629 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 | 4630 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
242d3a49 | 4631 | #endif |
76da0704 WC |
4632 | } else if (event == NETDEV_UNREGISTER && |
4633 | dev->reg_state != NETREG_UNREGISTERED) { | |
4634 | /* NETDEV_UNREGISTER could be fired for multiple times by | |
4635 | * netdev_wait_allrefs(). Make sure we only call this once. | |
4636 | */ | |
12d94a80 | 4637 | in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev); |
242d3a49 | 4638 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
12d94a80 ED |
4639 | in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev); |
4640 | in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev); | |
8ed67789 DL |
4641 | #endif |
4642 | } | |
4643 | ||
4644 | return NOTIFY_OK; | |
4645 | } | |
4646 | ||
1da177e4 LT |
4647 | /* |
4648 | * /proc | |
4649 | */ | |
4650 | ||
4651 | #ifdef CONFIG_PROC_FS | |
4652 | ||
33120b30 AD |
4653 | static const struct file_operations ipv6_route_proc_fops = { |
4654 | .owner = THIS_MODULE, | |
4655 | .open = ipv6_route_open, | |
4656 | .read = seq_read, | |
4657 | .llseek = seq_lseek, | |
8d2ca1d7 | 4658 | .release = seq_release_net, |
33120b30 AD |
4659 | }; |
4660 | ||
1da177e4 LT |
4661 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
4662 | { | |
69ddb805 | 4663 | struct net *net = (struct net *)seq->private; |
1da177e4 | 4664 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
4665 | net->ipv6.rt6_stats->fib_nodes, |
4666 | net->ipv6.rt6_stats->fib_route_nodes, | |
81eb8447 | 4667 | atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc), |
69ddb805 DL |
4668 | net->ipv6.rt6_stats->fib_rt_entries, |
4669 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 4670 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 4671 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
4672 | |
4673 | return 0; | |
4674 | } | |
4675 | ||
4676 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
4677 | { | |
de05c557 | 4678 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
4679 | } |
4680 | ||
9a32144e | 4681 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
4682 | .owner = THIS_MODULE, |
4683 | .open = rt6_stats_seq_open, | |
4684 | .read = seq_read, | |
4685 | .llseek = seq_lseek, | |
b6fcbdb4 | 4686 | .release = single_release_net, |
1da177e4 LT |
4687 | }; |
4688 | #endif /* CONFIG_PROC_FS */ | |
4689 | ||
4690 | #ifdef CONFIG_SYSCTL | |
4691 | ||
1da177e4 | 4692 | static |
fe2c6338 | 4693 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
4694 | void __user *buffer, size_t *lenp, loff_t *ppos) |
4695 | { | |
c486da34 LAG |
4696 | struct net *net; |
4697 | int delay; | |
4698 | if (!write) | |
1da177e4 | 4699 | return -EINVAL; |
c486da34 LAG |
4700 | |
4701 | net = (struct net *)ctl->extra1; | |
4702 | delay = net->ipv6.sysctl.flush_delay; | |
4703 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 4704 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 4705 | return 0; |
1da177e4 LT |
4706 | } |
4707 | ||
fe2c6338 | 4708 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 4709 | { |
1da177e4 | 4710 | .procname = "flush", |
4990509f | 4711 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 4712 | .maxlen = sizeof(int), |
89c8b3a1 | 4713 | .mode = 0200, |
6d9f239a | 4714 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
4715 | }, |
4716 | { | |
1da177e4 | 4717 | .procname = "gc_thresh", |
9a7ec3a9 | 4718 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
4719 | .maxlen = sizeof(int), |
4720 | .mode = 0644, | |
6d9f239a | 4721 | .proc_handler = proc_dointvec, |
1da177e4 LT |
4722 | }, |
4723 | { | |
1da177e4 | 4724 | .procname = "max_size", |
4990509f | 4725 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
4726 | .maxlen = sizeof(int), |
4727 | .mode = 0644, | |
6d9f239a | 4728 | .proc_handler = proc_dointvec, |
1da177e4 LT |
4729 | }, |
4730 | { | |
1da177e4 | 4731 | .procname = "gc_min_interval", |
4990509f | 4732 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
4733 | .maxlen = sizeof(int), |
4734 | .mode = 0644, | |
6d9f239a | 4735 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
4736 | }, |
4737 | { | |
1da177e4 | 4738 | .procname = "gc_timeout", |
4990509f | 4739 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
4740 | .maxlen = sizeof(int), |
4741 | .mode = 0644, | |
6d9f239a | 4742 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
4743 | }, |
4744 | { | |
1da177e4 | 4745 | .procname = "gc_interval", |
4990509f | 4746 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
4747 | .maxlen = sizeof(int), |
4748 | .mode = 0644, | |
6d9f239a | 4749 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
4750 | }, |
4751 | { | |
1da177e4 | 4752 | .procname = "gc_elasticity", |
4990509f | 4753 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
4754 | .maxlen = sizeof(int), |
4755 | .mode = 0644, | |
f3d3f616 | 4756 | .proc_handler = proc_dointvec, |
1da177e4 LT |
4757 | }, |
4758 | { | |
1da177e4 | 4759 | .procname = "mtu_expires", |
4990509f | 4760 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
4761 | .maxlen = sizeof(int), |
4762 | .mode = 0644, | |
6d9f239a | 4763 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
4764 | }, |
4765 | { | |
1da177e4 | 4766 | .procname = "min_adv_mss", |
4990509f | 4767 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
4768 | .maxlen = sizeof(int), |
4769 | .mode = 0644, | |
f3d3f616 | 4770 | .proc_handler = proc_dointvec, |
1da177e4 LT |
4771 | }, |
4772 | { | |
1da177e4 | 4773 | .procname = "gc_min_interval_ms", |
4990509f | 4774 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
4775 | .maxlen = sizeof(int), |
4776 | .mode = 0644, | |
6d9f239a | 4777 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 4778 | }, |
f8572d8f | 4779 | { } |
1da177e4 LT |
4780 | }; |
4781 | ||
2c8c1e72 | 4782 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
4783 | { |
4784 | struct ctl_table *table; | |
4785 | ||
4786 | table = kmemdup(ipv6_route_table_template, | |
4787 | sizeof(ipv6_route_table_template), | |
4788 | GFP_KERNEL); | |
5ee09105 YH |
4789 | |
4790 | if (table) { | |
4791 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 4792 | table[0].extra1 = net; |
86393e52 | 4793 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
4794 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
4795 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
4796 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
4797 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
4798 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
4799 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
4800 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 4801 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
4802 | |
4803 | /* Don't export sysctls to unprivileged users */ | |
4804 | if (net->user_ns != &init_user_ns) | |
4805 | table[0].procname = NULL; | |
5ee09105 YH |
4806 | } |
4807 | ||
760f2d01 DL |
4808 | return table; |
4809 | } | |
1da177e4 LT |
4810 | #endif |
4811 | ||
2c8c1e72 | 4812 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 4813 | { |
633d424b | 4814 | int ret = -ENOMEM; |
8ed67789 | 4815 | |
86393e52 AD |
4816 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
4817 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 4818 | |
fc66f95c ED |
4819 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
4820 | goto out_ip6_dst_ops; | |
4821 | ||
8ed67789 DL |
4822 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
4823 | sizeof(*net->ipv6.ip6_null_entry), | |
4824 | GFP_KERNEL); | |
4825 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 4826 | goto out_ip6_dst_entries; |
d8d1f30b | 4827 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
4828 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
4829 | ip6_template_metrics, true); | |
8ed67789 DL |
4830 | |
4831 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
feca7d8c | 4832 | net->ipv6.fib6_has_custom_rules = false; |
8ed67789 DL |
4833 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, |
4834 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
4835 | GFP_KERNEL); | |
68fffc67 PZ |
4836 | if (!net->ipv6.ip6_prohibit_entry) |
4837 | goto out_ip6_null_entry; | |
d8d1f30b | 4838 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
4839 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
4840 | ip6_template_metrics, true); | |
8ed67789 DL |
4841 | |
4842 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
4843 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
4844 | GFP_KERNEL); | |
68fffc67 PZ |
4845 | if (!net->ipv6.ip6_blk_hole_entry) |
4846 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 4847 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
4848 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
4849 | ip6_template_metrics, true); | |
8ed67789 DL |
4850 | #endif |
4851 | ||
b339a47c PZ |
4852 | net->ipv6.sysctl.flush_delay = 0; |
4853 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
4854 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
4855 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
4856 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
4857 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
4858 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
4859 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
4860 | ||
6891a346 BT |
4861 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
4862 | ||
8ed67789 DL |
4863 | ret = 0; |
4864 | out: | |
4865 | return ret; | |
f2fc6a54 | 4866 | |
68fffc67 PZ |
4867 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
4868 | out_ip6_prohibit_entry: | |
4869 | kfree(net->ipv6.ip6_prohibit_entry); | |
4870 | out_ip6_null_entry: | |
4871 | kfree(net->ipv6.ip6_null_entry); | |
4872 | #endif | |
fc66f95c ED |
4873 | out_ip6_dst_entries: |
4874 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 4875 | out_ip6_dst_ops: |
f2fc6a54 | 4876 | goto out; |
cdb18761 DL |
4877 | } |
4878 | ||
2c8c1e72 | 4879 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 4880 | { |
8ed67789 DL |
4881 | kfree(net->ipv6.ip6_null_entry); |
4882 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
4883 | kfree(net->ipv6.ip6_prohibit_entry); | |
4884 | kfree(net->ipv6.ip6_blk_hole_entry); | |
4885 | #endif | |
41bb78b4 | 4886 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
4887 | } |
4888 | ||
d189634e TG |
4889 | static int __net_init ip6_route_net_init_late(struct net *net) |
4890 | { | |
4891 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
4892 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
4893 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
4894 | #endif |
4895 | return 0; | |
4896 | } | |
4897 | ||
4898 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
4899 | { | |
4900 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
4901 | remove_proc_entry("ipv6_route", net->proc_net); |
4902 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
4903 | #endif |
4904 | } | |
4905 | ||
cdb18761 DL |
4906 | static struct pernet_operations ip6_route_net_ops = { |
4907 | .init = ip6_route_net_init, | |
4908 | .exit = ip6_route_net_exit, | |
4909 | }; | |
4910 | ||
c3426b47 DM |
4911 | static int __net_init ipv6_inetpeer_init(struct net *net) |
4912 | { | |
4913 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
4914 | ||
4915 | if (!bp) | |
4916 | return -ENOMEM; | |
4917 | inet_peer_base_init(bp); | |
4918 | net->ipv6.peers = bp; | |
4919 | return 0; | |
4920 | } | |
4921 | ||
4922 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
4923 | { | |
4924 | struct inet_peer_base *bp = net->ipv6.peers; | |
4925 | ||
4926 | net->ipv6.peers = NULL; | |
56a6b248 | 4927 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
4928 | kfree(bp); |
4929 | } | |
4930 | ||
2b823f72 | 4931 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
4932 | .init = ipv6_inetpeer_init, |
4933 | .exit = ipv6_inetpeer_exit, | |
4934 | }; | |
4935 | ||
d189634e TG |
4936 | static struct pernet_operations ip6_route_net_late_ops = { |
4937 | .init = ip6_route_net_init_late, | |
4938 | .exit = ip6_route_net_exit_late, | |
4939 | }; | |
4940 | ||
8ed67789 DL |
4941 | static struct notifier_block ip6_route_dev_notifier = { |
4942 | .notifier_call = ip6_route_dev_notify, | |
242d3a49 | 4943 | .priority = ADDRCONF_NOTIFY_PRIORITY - 10, |
8ed67789 DL |
4944 | }; |
4945 | ||
2f460933 WC |
4946 | void __init ip6_route_init_special_entries(void) |
4947 | { | |
4948 | /* Registering of the loopback is done before this portion of code, | |
4949 | * the loopback reference in rt6_info will not be taken, do it | |
4950 | * manually for init_net */ | |
4951 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; | |
4952 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
4953 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
4954 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; | |
4955 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
4956 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; | |
4957 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
4958 | #endif | |
4959 | } | |
4960 | ||
433d49c3 | 4961 | int __init ip6_route_init(void) |
1da177e4 | 4962 | { |
433d49c3 | 4963 | int ret; |
8d0b94af | 4964 | int cpu; |
433d49c3 | 4965 | |
9a7ec3a9 DL |
4966 | ret = -ENOMEM; |
4967 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 4968 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 4969 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 4970 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 4971 | goto out; |
14e50e57 | 4972 | |
fc66f95c | 4973 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 4974 | if (ret) |
bdb3289f | 4975 | goto out_kmem_cache; |
bdb3289f | 4976 | |
c3426b47 DM |
4977 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
4978 | if (ret) | |
e8803b6c | 4979 | goto out_dst_entries; |
2a0c451a | 4980 | |
7e52b33b DM |
4981 | ret = register_pernet_subsys(&ip6_route_net_ops); |
4982 | if (ret) | |
4983 | goto out_register_inetpeer; | |
c3426b47 | 4984 | |
5dc121e9 AE |
4985 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
4986 | ||
e8803b6c | 4987 | ret = fib6_init(); |
433d49c3 | 4988 | if (ret) |
8ed67789 | 4989 | goto out_register_subsys; |
433d49c3 | 4990 | |
433d49c3 DL |
4991 | ret = xfrm6_init(); |
4992 | if (ret) | |
e8803b6c | 4993 | goto out_fib6_init; |
c35b7e72 | 4994 | |
433d49c3 DL |
4995 | ret = fib6_rules_init(); |
4996 | if (ret) | |
4997 | goto xfrm6_init; | |
7e5449c2 | 4998 | |
d189634e TG |
4999 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
5000 | if (ret) | |
5001 | goto fib6_rules_init; | |
5002 | ||
16feebcf FW |
5003 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE, |
5004 | inet6_rtm_newroute, NULL, 0); | |
5005 | if (ret < 0) | |
5006 | goto out_register_late_subsys; | |
5007 | ||
5008 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE, | |
5009 | inet6_rtm_delroute, NULL, 0); | |
5010 | if (ret < 0) | |
5011 | goto out_register_late_subsys; | |
5012 | ||
5013 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE, | |
5014 | inet6_rtm_getroute, NULL, | |
5015 | RTNL_FLAG_DOIT_UNLOCKED); | |
5016 | if (ret < 0) | |
d189634e | 5017 | goto out_register_late_subsys; |
c127ea2c | 5018 | |
8ed67789 | 5019 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 5020 | if (ret) |
d189634e | 5021 | goto out_register_late_subsys; |
8ed67789 | 5022 | |
8d0b94af MKL |
5023 | for_each_possible_cpu(cpu) { |
5024 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
5025 | ||
5026 | INIT_LIST_HEAD(&ul->head); | |
5027 | spin_lock_init(&ul->lock); | |
5028 | } | |
5029 | ||
433d49c3 DL |
5030 | out: |
5031 | return ret; | |
5032 | ||
d189634e | 5033 | out_register_late_subsys: |
16feebcf | 5034 | rtnl_unregister_all(PF_INET6); |
d189634e | 5035 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
433d49c3 | 5036 | fib6_rules_init: |
433d49c3 DL |
5037 | fib6_rules_cleanup(); |
5038 | xfrm6_init: | |
433d49c3 | 5039 | xfrm6_fini(); |
2a0c451a TG |
5040 | out_fib6_init: |
5041 | fib6_gc_cleanup(); | |
8ed67789 DL |
5042 | out_register_subsys: |
5043 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
5044 | out_register_inetpeer: |
5045 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
5046 | out_dst_entries: |
5047 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 5048 | out_kmem_cache: |
f2fc6a54 | 5049 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 5050 | goto out; |
1da177e4 LT |
5051 | } |
5052 | ||
5053 | void ip6_route_cleanup(void) | |
5054 | { | |
8ed67789 | 5055 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 5056 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 5057 | fib6_rules_cleanup(); |
1da177e4 | 5058 | xfrm6_fini(); |
1da177e4 | 5059 | fib6_gc_cleanup(); |
c3426b47 | 5060 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 5061 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 5062 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 5063 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 5064 | } |