]>
Commit | Line | Data |
---|---|---|
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> |
457c4cbc | 47 | #include <net/net_namespace.h> |
1da177e4 LT |
48 | #include <net/snmp.h> |
49 | #include <net/ipv6.h> | |
50 | #include <net/ip6_fib.h> | |
51 | #include <net/ip6_route.h> | |
52 | #include <net/ndisc.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/tcp.h> | |
55 | #include <linux/rtnetlink.h> | |
56 | #include <net/dst.h> | |
904af04d | 57 | #include <net/dst_metadata.h> |
1da177e4 | 58 | #include <net/xfrm.h> |
8d71740c | 59 | #include <net/netevent.h> |
21713ebc | 60 | #include <net/netlink.h> |
51ebd318 | 61 | #include <net/nexthop.h> |
19e42e45 | 62 | #include <net/lwtunnel.h> |
904af04d | 63 | #include <net/ip_tunnels.h> |
1da177e4 LT |
64 | |
65 | #include <asm/uaccess.h> | |
66 | ||
67 | #ifdef CONFIG_SYSCTL | |
68 | #include <linux/sysctl.h> | |
69 | #endif | |
70 | ||
afc154e9 | 71 | enum rt6_nud_state { |
7e980569 JB |
72 | RT6_NUD_FAIL_HARD = -3, |
73 | RT6_NUD_FAIL_PROBE = -2, | |
74 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
75 | RT6_NUD_SUCCEED = 1 |
76 | }; | |
77 | ||
83a09abd | 78 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort); |
1da177e4 | 79 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 80 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 81 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
82 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
83 | static void ip6_dst_destroy(struct dst_entry *); | |
84 | static void ip6_dst_ifdown(struct dst_entry *, | |
85 | struct net_device *dev, int how); | |
569d3645 | 86 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
87 | |
88 | static int ip6_pkt_discard(struct sk_buff *skb); | |
ede2059d | 89 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
7150aede | 90 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
ede2059d | 91 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 92 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
93 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
94 | struct sk_buff *skb, u32 mtu); | |
95 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
96 | struct sk_buff *skb); | |
4b32b5ad | 97 | static void rt6_dst_from_metrics_check(struct rt6_info *rt); |
52bd4c0c | 98 | static int rt6_score_route(struct rt6_info *rt, int oif, int strict); |
1da177e4 | 99 | |
70ceb4f5 | 100 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 101 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
102 | const struct in6_addr *prefix, int prefixlen, |
103 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 104 | unsigned int pref); |
efa2cea0 | 105 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
106 | const struct in6_addr *prefix, int prefixlen, |
107 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
108 | #endif |
109 | ||
8d0b94af MKL |
110 | struct uncached_list { |
111 | spinlock_t lock; | |
112 | struct list_head head; | |
113 | }; | |
114 | ||
115 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
116 | ||
117 | static void rt6_uncached_list_add(struct rt6_info *rt) | |
118 | { | |
119 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
120 | ||
121 | rt->dst.flags |= DST_NOCACHE; | |
122 | rt->rt6i_uncached_list = ul; | |
123 | ||
124 | spin_lock_bh(&ul->lock); | |
125 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
126 | spin_unlock_bh(&ul->lock); | |
127 | } | |
128 | ||
129 | static void rt6_uncached_list_del(struct rt6_info *rt) | |
130 | { | |
131 | if (!list_empty(&rt->rt6i_uncached)) { | |
132 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
133 | ||
134 | spin_lock_bh(&ul->lock); | |
135 | list_del(&rt->rt6i_uncached); | |
136 | spin_unlock_bh(&ul->lock); | |
137 | } | |
138 | } | |
139 | ||
140 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
141 | { | |
142 | struct net_device *loopback_dev = net->loopback_dev; | |
143 | int cpu; | |
144 | ||
145 | for_each_possible_cpu(cpu) { | |
146 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
147 | struct rt6_info *rt; | |
148 | ||
149 | spin_lock_bh(&ul->lock); | |
150 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
151 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
152 | struct net_device *rt_dev = rt->dst.dev; | |
153 | ||
154 | if (rt_idev && (rt_idev->dev == dev || !dev) && | |
155 | rt_idev->dev != loopback_dev) { | |
156 | rt->rt6i_idev = in6_dev_get(loopback_dev); | |
157 | in6_dev_put(rt_idev); | |
158 | } | |
159 | ||
160 | if (rt_dev && (rt_dev == dev || !dev) && | |
161 | rt_dev != loopback_dev) { | |
162 | rt->dst.dev = loopback_dev; | |
163 | dev_hold(rt->dst.dev); | |
164 | dev_put(rt_dev); | |
165 | } | |
166 | } | |
167 | spin_unlock_bh(&ul->lock); | |
168 | } | |
169 | } | |
170 | ||
d52d3997 MKL |
171 | static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt) |
172 | { | |
173 | return dst_metrics_write_ptr(rt->dst.from); | |
174 | } | |
175 | ||
06582540 DM |
176 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
177 | { | |
4b32b5ad | 178 | struct rt6_info *rt = (struct rt6_info *)dst; |
06582540 | 179 | |
d52d3997 MKL |
180 | if (rt->rt6i_flags & RTF_PCPU) |
181 | return rt6_pcpu_cow_metrics(rt); | |
182 | else if (rt->rt6i_flags & RTF_CACHE) | |
4b32b5ad MKL |
183 | return NULL; |
184 | else | |
3b471175 | 185 | return dst_cow_metrics_generic(dst, old); |
06582540 DM |
186 | } |
187 | ||
f894cbf8 DM |
188 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
189 | struct sk_buff *skb, | |
190 | const void *daddr) | |
39232973 DM |
191 | { |
192 | struct in6_addr *p = &rt->rt6i_gateway; | |
193 | ||
a7563f34 | 194 | if (!ipv6_addr_any(p)) |
39232973 | 195 | return (const void *) p; |
f894cbf8 DM |
196 | else if (skb) |
197 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
198 | return daddr; |
199 | } | |
200 | ||
f894cbf8 DM |
201 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
202 | struct sk_buff *skb, | |
203 | const void *daddr) | |
d3aaeb38 | 204 | { |
39232973 DM |
205 | struct rt6_info *rt = (struct rt6_info *) dst; |
206 | struct neighbour *n; | |
207 | ||
f894cbf8 | 208 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 209 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
210 | if (n) |
211 | return n; | |
212 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
213 | } | |
214 | ||
9a7ec3a9 | 215 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 216 | .family = AF_INET6, |
1da177e4 LT |
217 | .gc = ip6_dst_gc, |
218 | .gc_thresh = 1024, | |
219 | .check = ip6_dst_check, | |
0dbaee3b | 220 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 221 | .mtu = ip6_mtu, |
06582540 | 222 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
223 | .destroy = ip6_dst_destroy, |
224 | .ifdown = ip6_dst_ifdown, | |
225 | .negative_advice = ip6_negative_advice, | |
226 | .link_failure = ip6_link_failure, | |
227 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 228 | .redirect = rt6_do_redirect, |
9f8955cc | 229 | .local_out = __ip6_local_out, |
d3aaeb38 | 230 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
231 | }; |
232 | ||
ebb762f2 | 233 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 234 | { |
618f9bc7 SK |
235 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
236 | ||
237 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
238 | } |
239 | ||
6700c270 DM |
240 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
241 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
242 | { |
243 | } | |
244 | ||
6700c270 DM |
245 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
246 | struct sk_buff *skb) | |
b587ee3b DM |
247 | { |
248 | } | |
249 | ||
0972ddb2 HB |
250 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
251 | unsigned long old) | |
252 | { | |
253 | return NULL; | |
254 | } | |
255 | ||
14e50e57 DM |
256 | static struct dst_ops ip6_dst_blackhole_ops = { |
257 | .family = AF_INET6, | |
14e50e57 DM |
258 | .destroy = ip6_dst_destroy, |
259 | .check = ip6_dst_check, | |
ebb762f2 | 260 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 261 | .default_advmss = ip6_default_advmss, |
14e50e57 | 262 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 263 | .redirect = ip6_rt_blackhole_redirect, |
0972ddb2 | 264 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 265 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
266 | }; |
267 | ||
62fa8a84 | 268 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 269 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
270 | }; |
271 | ||
fb0af4c7 | 272 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
273 | .dst = { |
274 | .__refcnt = ATOMIC_INIT(1), | |
275 | .__use = 1, | |
2c20cbd7 | 276 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 277 | .error = -ENETUNREACH, |
d8d1f30b CG |
278 | .input = ip6_pkt_discard, |
279 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
280 | }, |
281 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 282 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
283 | .rt6i_metric = ~(u32) 0, |
284 | .rt6i_ref = ATOMIC_INIT(1), | |
285 | }; | |
286 | ||
101367c2 TG |
287 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
288 | ||
fb0af4c7 | 289 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
290 | .dst = { |
291 | .__refcnt = ATOMIC_INIT(1), | |
292 | .__use = 1, | |
2c20cbd7 | 293 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 294 | .error = -EACCES, |
d8d1f30b CG |
295 | .input = ip6_pkt_prohibit, |
296 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
297 | }, |
298 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 299 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
300 | .rt6i_metric = ~(u32) 0, |
301 | .rt6i_ref = ATOMIC_INIT(1), | |
302 | }; | |
303 | ||
fb0af4c7 | 304 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
305 | .dst = { |
306 | .__refcnt = ATOMIC_INIT(1), | |
307 | .__use = 1, | |
2c20cbd7 | 308 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 309 | .error = -EINVAL, |
d8d1f30b | 310 | .input = dst_discard, |
ede2059d | 311 | .output = dst_discard_out, |
101367c2 TG |
312 | }, |
313 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 314 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
315 | .rt6i_metric = ~(u32) 0, |
316 | .rt6i_ref = ATOMIC_INIT(1), | |
317 | }; | |
318 | ||
319 | #endif | |
320 | ||
1da177e4 | 321 | /* allocate dst with ip6_dst_ops */ |
d52d3997 MKL |
322 | static struct rt6_info *__ip6_dst_alloc(struct net *net, |
323 | struct net_device *dev, | |
ad706862 | 324 | int flags) |
1da177e4 | 325 | { |
97bab73f | 326 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 327 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 328 | |
97bab73f | 329 | if (rt) { |
8104891b SK |
330 | struct dst_entry *dst = &rt->dst; |
331 | ||
332 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
51ebd318 | 333 | INIT_LIST_HEAD(&rt->rt6i_siblings); |
8d0b94af | 334 | INIT_LIST_HEAD(&rt->rt6i_uncached); |
97bab73f | 335 | } |
cf911662 | 336 | return rt; |
1da177e4 LT |
337 | } |
338 | ||
d52d3997 MKL |
339 | static struct rt6_info *ip6_dst_alloc(struct net *net, |
340 | struct net_device *dev, | |
ad706862 | 341 | int flags) |
d52d3997 | 342 | { |
ad706862 | 343 | struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags); |
d52d3997 MKL |
344 | |
345 | if (rt) { | |
346 | rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC); | |
347 | if (rt->rt6i_pcpu) { | |
348 | int cpu; | |
349 | ||
350 | for_each_possible_cpu(cpu) { | |
351 | struct rt6_info **p; | |
352 | ||
353 | p = per_cpu_ptr(rt->rt6i_pcpu, cpu); | |
354 | /* no one shares rt */ | |
355 | *p = NULL; | |
356 | } | |
357 | } else { | |
358 | dst_destroy((struct dst_entry *)rt); | |
359 | return NULL; | |
360 | } | |
361 | } | |
362 | ||
363 | return rt; | |
364 | } | |
365 | ||
1da177e4 LT |
366 | static void ip6_dst_destroy(struct dst_entry *dst) |
367 | { | |
368 | struct rt6_info *rt = (struct rt6_info *)dst; | |
ecd98837 | 369 | struct dst_entry *from = dst->from; |
8d0b94af | 370 | struct inet6_dev *idev; |
1da177e4 | 371 | |
4b32b5ad | 372 | dst_destroy_metrics_generic(dst); |
87775312 | 373 | free_percpu(rt->rt6i_pcpu); |
8d0b94af MKL |
374 | rt6_uncached_list_del(rt); |
375 | ||
376 | idev = rt->rt6i_idev; | |
38308473 | 377 | if (idev) { |
1da177e4 LT |
378 | rt->rt6i_idev = NULL; |
379 | in6_dev_put(idev); | |
1ab1457c | 380 | } |
1716a961 | 381 | |
ecd98837 YH |
382 | dst->from = NULL; |
383 | dst_release(from); | |
b3419363 DM |
384 | } |
385 | ||
1da177e4 LT |
386 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
387 | int how) | |
388 | { | |
389 | struct rt6_info *rt = (struct rt6_info *)dst; | |
390 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 391 | struct net_device *loopback_dev = |
c346dca1 | 392 | dev_net(dev)->loopback_dev; |
1da177e4 | 393 | |
97cac082 DM |
394 | if (dev != loopback_dev) { |
395 | if (idev && idev->dev == dev) { | |
396 | struct inet6_dev *loopback_idev = | |
397 | in6_dev_get(loopback_dev); | |
398 | if (loopback_idev) { | |
399 | rt->rt6i_idev = loopback_idev; | |
400 | in6_dev_put(idev); | |
401 | } | |
402 | } | |
1da177e4 LT |
403 | } |
404 | } | |
405 | ||
a50feda5 | 406 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 407 | { |
1716a961 G |
408 | if (rt->rt6i_flags & RTF_EXPIRES) { |
409 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 410 | return true; |
1716a961 | 411 | } else if (rt->dst.from) { |
3fd91fb3 | 412 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 413 | } |
a50feda5 | 414 | return false; |
1da177e4 LT |
415 | } |
416 | ||
51ebd318 ND |
417 | /* Multipath route selection: |
418 | * Hash based function using packet header and flowlabel. | |
419 | * Adapted from fib_info_hashfn() | |
420 | */ | |
421 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
422 | const struct flowi6 *fl6) | |
423 | { | |
644d0e65 | 424 | return get_hash_from_flowi6(fl6) % candidate_count; |
51ebd318 ND |
425 | } |
426 | ||
427 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
52bd4c0c ND |
428 | struct flowi6 *fl6, int oif, |
429 | int strict) | |
51ebd318 ND |
430 | { |
431 | struct rt6_info *sibling, *next_sibling; | |
432 | int route_choosen; | |
433 | ||
434 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
435 | /* Don't change the route, if route_choosen == 0 | |
436 | * (siblings does not include ourself) | |
437 | */ | |
438 | if (route_choosen) | |
439 | list_for_each_entry_safe(sibling, next_sibling, | |
440 | &match->rt6i_siblings, rt6i_siblings) { | |
441 | route_choosen--; | |
442 | if (route_choosen == 0) { | |
52bd4c0c ND |
443 | if (rt6_score_route(sibling, oif, strict) < 0) |
444 | break; | |
51ebd318 ND |
445 | match = sibling; |
446 | break; | |
447 | } | |
448 | } | |
449 | return match; | |
450 | } | |
451 | ||
1da177e4 | 452 | /* |
c71099ac | 453 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
454 | */ |
455 | ||
8ed67789 DL |
456 | static inline struct rt6_info *rt6_device_match(struct net *net, |
457 | struct rt6_info *rt, | |
b71d1d42 | 458 | const struct in6_addr *saddr, |
1da177e4 | 459 | int oif, |
d420895e | 460 | int flags) |
1da177e4 LT |
461 | { |
462 | struct rt6_info *local = NULL; | |
463 | struct rt6_info *sprt; | |
464 | ||
dd3abc4e YH |
465 | if (!oif && ipv6_addr_any(saddr)) |
466 | goto out; | |
467 | ||
d8d1f30b | 468 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 469 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
470 | |
471 | if (oif) { | |
1da177e4 LT |
472 | if (dev->ifindex == oif) |
473 | return sprt; | |
474 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 475 | if (!sprt->rt6i_idev || |
1da177e4 | 476 | sprt->rt6i_idev->dev->ifindex != oif) { |
17fb0b2b | 477 | if (flags & RT6_LOOKUP_F_IFACE) |
1da177e4 | 478 | continue; |
17fb0b2b DA |
479 | if (local && |
480 | local->rt6i_idev->dev->ifindex == oif) | |
1da177e4 LT |
481 | continue; |
482 | } | |
483 | local = sprt; | |
484 | } | |
dd3abc4e YH |
485 | } else { |
486 | if (ipv6_chk_addr(net, saddr, dev, | |
487 | flags & RT6_LOOKUP_F_IFACE)) | |
488 | return sprt; | |
1da177e4 | 489 | } |
dd3abc4e | 490 | } |
1da177e4 | 491 | |
dd3abc4e | 492 | if (oif) { |
1da177e4 LT |
493 | if (local) |
494 | return local; | |
495 | ||
d420895e | 496 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 497 | return net->ipv6.ip6_null_entry; |
1da177e4 | 498 | } |
dd3abc4e | 499 | out: |
1da177e4 LT |
500 | return rt; |
501 | } | |
502 | ||
27097255 | 503 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
504 | struct __rt6_probe_work { |
505 | struct work_struct work; | |
506 | struct in6_addr target; | |
507 | struct net_device *dev; | |
508 | }; | |
509 | ||
510 | static void rt6_probe_deferred(struct work_struct *w) | |
511 | { | |
512 | struct in6_addr mcaddr; | |
513 | struct __rt6_probe_work *work = | |
514 | container_of(w, struct __rt6_probe_work, work); | |
515 | ||
516 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
38cf595b | 517 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, NULL); |
c2f17e82 | 518 | dev_put(work->dev); |
662f5533 | 519 | kfree(work); |
c2f17e82 HFS |
520 | } |
521 | ||
27097255 YH |
522 | static void rt6_probe(struct rt6_info *rt) |
523 | { | |
990edb42 | 524 | struct __rt6_probe_work *work; |
f2c31e32 | 525 | struct neighbour *neigh; |
27097255 YH |
526 | /* |
527 | * Okay, this does not seem to be appropriate | |
528 | * for now, however, we need to check if it | |
529 | * is really so; aka Router Reachability Probing. | |
530 | * | |
531 | * Router Reachability Probe MUST be rate-limited | |
532 | * to no more than one per minute. | |
533 | */ | |
2152caea | 534 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 535 | return; |
2152caea YH |
536 | rcu_read_lock_bh(); |
537 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
538 | if (neigh) { | |
8d6c31bf MKL |
539 | if (neigh->nud_state & NUD_VALID) |
540 | goto out; | |
541 | ||
990edb42 | 542 | work = NULL; |
2152caea | 543 | write_lock(&neigh->lock); |
990edb42 MKL |
544 | if (!(neigh->nud_state & NUD_VALID) && |
545 | time_after(jiffies, | |
546 | neigh->updated + | |
547 | rt->rt6i_idev->cnf.rtr_probe_interval)) { | |
548 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
549 | if (work) | |
550 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 551 | } |
2152caea | 552 | write_unlock(&neigh->lock); |
990edb42 MKL |
553 | } else { |
554 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
f2c31e32 | 555 | } |
990edb42 MKL |
556 | |
557 | if (work) { | |
558 | INIT_WORK(&work->work, rt6_probe_deferred); | |
559 | work->target = rt->rt6i_gateway; | |
560 | dev_hold(rt->dst.dev); | |
561 | work->dev = rt->dst.dev; | |
562 | schedule_work(&work->work); | |
563 | } | |
564 | ||
8d6c31bf | 565 | out: |
2152caea | 566 | rcu_read_unlock_bh(); |
27097255 YH |
567 | } |
568 | #else | |
569 | static inline void rt6_probe(struct rt6_info *rt) | |
570 | { | |
27097255 YH |
571 | } |
572 | #endif | |
573 | ||
1da177e4 | 574 | /* |
554cfb7e | 575 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 576 | */ |
b6f99a21 | 577 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 578 | { |
d1918542 | 579 | struct net_device *dev = rt->dst.dev; |
161980f4 | 580 | if (!oif || dev->ifindex == oif) |
554cfb7e | 581 | return 2; |
161980f4 DM |
582 | if ((dev->flags & IFF_LOOPBACK) && |
583 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
584 | return 1; | |
585 | return 0; | |
554cfb7e | 586 | } |
1da177e4 | 587 | |
afc154e9 | 588 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 589 | { |
f2c31e32 | 590 | struct neighbour *neigh; |
afc154e9 | 591 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 592 | |
4d0c5911 YH |
593 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
594 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 595 | return RT6_NUD_SUCCEED; |
145a3621 YH |
596 | |
597 | rcu_read_lock_bh(); | |
598 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
599 | if (neigh) { | |
600 | read_lock(&neigh->lock); | |
554cfb7e | 601 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 602 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 603 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 604 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 605 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
606 | else |
607 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 608 | #endif |
145a3621 | 609 | read_unlock(&neigh->lock); |
afc154e9 HFS |
610 | } else { |
611 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 612 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 613 | } |
145a3621 YH |
614 | rcu_read_unlock_bh(); |
615 | ||
a5a81f0b | 616 | return ret; |
1da177e4 LT |
617 | } |
618 | ||
554cfb7e YH |
619 | static int rt6_score_route(struct rt6_info *rt, int oif, |
620 | int strict) | |
1da177e4 | 621 | { |
a5a81f0b | 622 | int m; |
1ab1457c | 623 | |
4d0c5911 | 624 | m = rt6_check_dev(rt, oif); |
77d16f45 | 625 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 626 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
627 | #ifdef CONFIG_IPV6_ROUTER_PREF |
628 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
629 | #endif | |
afc154e9 HFS |
630 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
631 | int n = rt6_check_neigh(rt); | |
632 | if (n < 0) | |
633 | return n; | |
634 | } | |
554cfb7e YH |
635 | return m; |
636 | } | |
637 | ||
f11e6659 | 638 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
639 | int *mpri, struct rt6_info *match, |
640 | bool *do_rr) | |
554cfb7e | 641 | { |
f11e6659 | 642 | int m; |
afc154e9 | 643 | bool match_do_rr = false; |
35103d11 AG |
644 | struct inet6_dev *idev = rt->rt6i_idev; |
645 | struct net_device *dev = rt->dst.dev; | |
646 | ||
647 | if (dev && !netif_carrier_ok(dev) && | |
648 | idev->cnf.ignore_routes_with_linkdown) | |
649 | goto out; | |
f11e6659 DM |
650 | |
651 | if (rt6_check_expired(rt)) | |
652 | goto out; | |
653 | ||
654 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 655 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
656 | match_do_rr = true; |
657 | m = 0; /* lowest valid score */ | |
7e980569 | 658 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 659 | goto out; |
afc154e9 HFS |
660 | } |
661 | ||
662 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
663 | rt6_probe(rt); | |
f11e6659 | 664 | |
7e980569 | 665 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 666 | if (m > *mpri) { |
afc154e9 | 667 | *do_rr = match_do_rr; |
f11e6659 DM |
668 | *mpri = m; |
669 | match = rt; | |
f11e6659 | 670 | } |
f11e6659 DM |
671 | out: |
672 | return match; | |
673 | } | |
674 | ||
675 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
676 | struct rt6_info *rr_head, | |
afc154e9 HFS |
677 | u32 metric, int oif, int strict, |
678 | bool *do_rr) | |
f11e6659 | 679 | { |
9fbdcfaf | 680 | struct rt6_info *rt, *match, *cont; |
554cfb7e | 681 | int mpri = -1; |
1da177e4 | 682 | |
f11e6659 | 683 | match = NULL; |
9fbdcfaf SK |
684 | cont = NULL; |
685 | for (rt = rr_head; rt; rt = rt->dst.rt6_next) { | |
686 | if (rt->rt6i_metric != metric) { | |
687 | cont = rt; | |
688 | break; | |
689 | } | |
690 | ||
691 | match = find_match(rt, oif, strict, &mpri, match, do_rr); | |
692 | } | |
693 | ||
694 | for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) { | |
695 | if (rt->rt6i_metric != metric) { | |
696 | cont = rt; | |
697 | break; | |
698 | } | |
699 | ||
afc154e9 | 700 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
9fbdcfaf SK |
701 | } |
702 | ||
703 | if (match || !cont) | |
704 | return match; | |
705 | ||
706 | for (rt = cont; rt; rt = rt->dst.rt6_next) | |
afc154e9 | 707 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 708 | |
f11e6659 DM |
709 | return match; |
710 | } | |
1da177e4 | 711 | |
f11e6659 DM |
712 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
713 | { | |
714 | struct rt6_info *match, *rt0; | |
8ed67789 | 715 | struct net *net; |
afc154e9 | 716 | bool do_rr = false; |
1da177e4 | 717 | |
f11e6659 DM |
718 | rt0 = fn->rr_ptr; |
719 | if (!rt0) | |
720 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 721 | |
afc154e9 HFS |
722 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
723 | &do_rr); | |
1da177e4 | 724 | |
afc154e9 | 725 | if (do_rr) { |
d8d1f30b | 726 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 727 | |
554cfb7e | 728 | /* no entries matched; do round-robin */ |
f11e6659 DM |
729 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
730 | next = fn->leaf; | |
731 | ||
732 | if (next != rt0) | |
733 | fn->rr_ptr = next; | |
1da177e4 | 734 | } |
1da177e4 | 735 | |
d1918542 | 736 | net = dev_net(rt0->dst.dev); |
a02cec21 | 737 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
738 | } |
739 | ||
8b9df265 MKL |
740 | static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt) |
741 | { | |
742 | return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)); | |
743 | } | |
744 | ||
70ceb4f5 YH |
745 | #ifdef CONFIG_IPV6_ROUTE_INFO |
746 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 747 | const struct in6_addr *gwaddr) |
70ceb4f5 | 748 | { |
c346dca1 | 749 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
750 | struct route_info *rinfo = (struct route_info *) opt; |
751 | struct in6_addr prefix_buf, *prefix; | |
752 | unsigned int pref; | |
4bed72e4 | 753 | unsigned long lifetime; |
70ceb4f5 YH |
754 | struct rt6_info *rt; |
755 | ||
756 | if (len < sizeof(struct route_info)) { | |
757 | return -EINVAL; | |
758 | } | |
759 | ||
760 | /* Sanity check for prefix_len and length */ | |
761 | if (rinfo->length > 3) { | |
762 | return -EINVAL; | |
763 | } else if (rinfo->prefix_len > 128) { | |
764 | return -EINVAL; | |
765 | } else if (rinfo->prefix_len > 64) { | |
766 | if (rinfo->length < 2) { | |
767 | return -EINVAL; | |
768 | } | |
769 | } else if (rinfo->prefix_len > 0) { | |
770 | if (rinfo->length < 1) { | |
771 | return -EINVAL; | |
772 | } | |
773 | } | |
774 | ||
775 | pref = rinfo->route_pref; | |
776 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 777 | return -EINVAL; |
70ceb4f5 | 778 | |
4bed72e4 | 779 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
780 | |
781 | if (rinfo->length == 3) | |
782 | prefix = (struct in6_addr *)rinfo->prefix; | |
783 | else { | |
784 | /* this function is safe */ | |
785 | ipv6_addr_prefix(&prefix_buf, | |
786 | (struct in6_addr *)rinfo->prefix, | |
787 | rinfo->prefix_len); | |
788 | prefix = &prefix_buf; | |
789 | } | |
790 | ||
f104a567 DJ |
791 | if (rinfo->prefix_len == 0) |
792 | rt = rt6_get_dflt_router(gwaddr, dev); | |
793 | else | |
794 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
795 | gwaddr, dev->ifindex); | |
70ceb4f5 YH |
796 | |
797 | if (rt && !lifetime) { | |
e0a1ad73 | 798 | ip6_del_rt(rt); |
70ceb4f5 YH |
799 | rt = NULL; |
800 | } | |
801 | ||
802 | if (!rt && lifetime) | |
efa2cea0 | 803 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
804 | pref); |
805 | else if (rt) | |
806 | rt->rt6i_flags = RTF_ROUTEINFO | | |
807 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
808 | ||
809 | if (rt) { | |
1716a961 G |
810 | if (!addrconf_finite_timeout(lifetime)) |
811 | rt6_clean_expires(rt); | |
812 | else | |
813 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
814 | ||
94e187c0 | 815 | ip6_rt_put(rt); |
70ceb4f5 YH |
816 | } |
817 | return 0; | |
818 | } | |
819 | #endif | |
820 | ||
a3c00e46 MKL |
821 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
822 | struct in6_addr *saddr) | |
823 | { | |
824 | struct fib6_node *pn; | |
825 | while (1) { | |
826 | if (fn->fn_flags & RTN_TL_ROOT) | |
827 | return NULL; | |
828 | pn = fn->parent; | |
829 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) | |
830 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); | |
831 | else | |
832 | fn = pn; | |
833 | if (fn->fn_flags & RTN_RTINFO) | |
834 | return fn; | |
835 | } | |
836 | } | |
c71099ac | 837 | |
8ed67789 DL |
838 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
839 | struct fib6_table *table, | |
4c9483b2 | 840 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
841 | { |
842 | struct fib6_node *fn; | |
843 | struct rt6_info *rt; | |
844 | ||
c71099ac | 845 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 846 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
847 | restart: |
848 | rt = fn->leaf; | |
4c9483b2 | 849 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 | 850 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
52bd4c0c | 851 | rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); |
a3c00e46 MKL |
852 | if (rt == net->ipv6.ip6_null_entry) { |
853 | fn = fib6_backtrack(fn, &fl6->saddr); | |
854 | if (fn) | |
855 | goto restart; | |
856 | } | |
d8d1f30b | 857 | dst_use(&rt->dst, jiffies); |
c71099ac | 858 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
859 | return rt; |
860 | ||
861 | } | |
862 | ||
67ba4152 | 863 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
ea6e574e FW |
864 | int flags) |
865 | { | |
866 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
867 | } | |
868 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
869 | ||
9acd9f3a YH |
870 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
871 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 872 | { |
4c9483b2 DM |
873 | struct flowi6 fl6 = { |
874 | .flowi6_oif = oif, | |
875 | .daddr = *daddr, | |
c71099ac TG |
876 | }; |
877 | struct dst_entry *dst; | |
77d16f45 | 878 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 879 | |
adaa70bb | 880 | if (saddr) { |
4c9483b2 | 881 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
882 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
883 | } | |
884 | ||
4c9483b2 | 885 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
886 | if (dst->error == 0) |
887 | return (struct rt6_info *) dst; | |
888 | ||
889 | dst_release(dst); | |
890 | ||
1da177e4 LT |
891 | return NULL; |
892 | } | |
7159039a YH |
893 | EXPORT_SYMBOL(rt6_lookup); |
894 | ||
c71099ac | 895 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
896 | It takes new route entry, the addition fails by any reason the |
897 | route is freed. In any case, if caller does not hold it, it may | |
898 | be destroyed. | |
899 | */ | |
900 | ||
e5fd387a | 901 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, |
e715b6d3 | 902 | struct mx6_config *mxc) |
1da177e4 LT |
903 | { |
904 | int err; | |
c71099ac | 905 | struct fib6_table *table; |
1da177e4 | 906 | |
c71099ac TG |
907 | table = rt->rt6i_table; |
908 | write_lock_bh(&table->tb6_lock); | |
e715b6d3 | 909 | err = fib6_add(&table->tb6_root, rt, info, mxc); |
c71099ac | 910 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
911 | |
912 | return err; | |
913 | } | |
914 | ||
40e22e8f TG |
915 | int ip6_ins_rt(struct rt6_info *rt) |
916 | { | |
e715b6d3 FW |
917 | struct nl_info info = { .nl_net = dev_net(rt->dst.dev), }; |
918 | struct mx6_config mxc = { .mx = NULL, }; | |
919 | ||
920 | return __ip6_ins_rt(rt, &info, &mxc); | |
40e22e8f TG |
921 | } |
922 | ||
8b9df265 MKL |
923 | static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort, |
924 | const struct in6_addr *daddr, | |
925 | const struct in6_addr *saddr) | |
1da177e4 | 926 | { |
1da177e4 LT |
927 | struct rt6_info *rt; |
928 | ||
929 | /* | |
930 | * Clone the route. | |
931 | */ | |
932 | ||
d52d3997 | 933 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) |
83a09abd | 934 | ort = (struct rt6_info *)ort->dst.from; |
1da177e4 | 935 | |
ad706862 | 936 | rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0); |
83a09abd MKL |
937 | |
938 | if (!rt) | |
939 | return NULL; | |
940 | ||
941 | ip6_rt_copy_init(rt, ort); | |
942 | rt->rt6i_flags |= RTF_CACHE; | |
943 | rt->rt6i_metric = 0; | |
944 | rt->dst.flags |= DST_HOST; | |
945 | rt->rt6i_dst.addr = *daddr; | |
946 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 947 | |
83a09abd MKL |
948 | if (!rt6_is_gw_or_nonexthop(ort)) { |
949 | if (ort->rt6i_dst.plen != 128 && | |
950 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
951 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 952 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
953 | if (rt->rt6i_src.plen && saddr) { |
954 | rt->rt6i_src.addr = *saddr; | |
955 | rt->rt6i_src.plen = 128; | |
8b9df265 | 956 | } |
83a09abd | 957 | #endif |
95a9a5ba | 958 | } |
1da177e4 | 959 | |
95a9a5ba YH |
960 | return rt; |
961 | } | |
1da177e4 | 962 | |
d52d3997 MKL |
963 | static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt) |
964 | { | |
965 | struct rt6_info *pcpu_rt; | |
966 | ||
967 | pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev), | |
ad706862 | 968 | rt->dst.dev, rt->dst.flags); |
d52d3997 MKL |
969 | |
970 | if (!pcpu_rt) | |
971 | return NULL; | |
972 | ip6_rt_copy_init(pcpu_rt, rt); | |
973 | pcpu_rt->rt6i_protocol = rt->rt6i_protocol; | |
974 | pcpu_rt->rt6i_flags |= RTF_PCPU; | |
975 | return pcpu_rt; | |
976 | } | |
977 | ||
978 | /* It should be called with read_lock_bh(&tb6_lock) acquired */ | |
979 | static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt) | |
980 | { | |
a73e4195 | 981 | struct rt6_info *pcpu_rt, **p; |
d52d3997 MKL |
982 | |
983 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
984 | pcpu_rt = *p; | |
985 | ||
a73e4195 MKL |
986 | if (pcpu_rt) { |
987 | dst_hold(&pcpu_rt->dst); | |
988 | rt6_dst_from_metrics_check(pcpu_rt); | |
989 | } | |
990 | return pcpu_rt; | |
991 | } | |
992 | ||
993 | static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt) | |
994 | { | |
9c7370a1 | 995 | struct fib6_table *table = rt->rt6i_table; |
a73e4195 | 996 | struct rt6_info *pcpu_rt, *prev, **p; |
d52d3997 MKL |
997 | |
998 | pcpu_rt = ip6_rt_pcpu_alloc(rt); | |
999 | if (!pcpu_rt) { | |
1000 | struct net *net = dev_net(rt->dst.dev); | |
1001 | ||
9c7370a1 MKL |
1002 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
1003 | return net->ipv6.ip6_null_entry; | |
d52d3997 MKL |
1004 | } |
1005 | ||
9c7370a1 MKL |
1006 | read_lock_bh(&table->tb6_lock); |
1007 | if (rt->rt6i_pcpu) { | |
1008 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1009 | prev = cmpxchg(p, NULL, pcpu_rt); | |
1010 | if (prev) { | |
1011 | /* If someone did it before us, return prev instead */ | |
1012 | dst_destroy(&pcpu_rt->dst); | |
1013 | pcpu_rt = prev; | |
1014 | } | |
1015 | } else { | |
1016 | /* rt has been removed from the fib6 tree | |
1017 | * before we have a chance to acquire the read_lock. | |
1018 | * In this case, don't brother to create a pcpu rt | |
1019 | * since rt is going away anyway. The next | |
1020 | * dst_check() will trigger a re-lookup. | |
1021 | */ | |
d52d3997 | 1022 | dst_destroy(&pcpu_rt->dst); |
9c7370a1 | 1023 | pcpu_rt = rt; |
d52d3997 | 1024 | } |
d52d3997 MKL |
1025 | dst_hold(&pcpu_rt->dst); |
1026 | rt6_dst_from_metrics_check(pcpu_rt); | |
9c7370a1 | 1027 | read_unlock_bh(&table->tb6_lock); |
d52d3997 MKL |
1028 | return pcpu_rt; |
1029 | } | |
1030 | ||
8ed67789 | 1031 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 1032 | struct flowi6 *fl6, int flags) |
1da177e4 | 1033 | { |
367efcb9 | 1034 | struct fib6_node *fn, *saved_fn; |
45e4fd26 | 1035 | struct rt6_info *rt; |
c71099ac | 1036 | int strict = 0; |
1da177e4 | 1037 | |
77d16f45 | 1038 | strict |= flags & RT6_LOOKUP_F_IFACE; |
367efcb9 MKL |
1039 | if (net->ipv6.devconf_all->forwarding == 0) |
1040 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1da177e4 | 1041 | |
c71099ac | 1042 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 1043 | |
4c9483b2 | 1044 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 1045 | saved_fn = fn; |
1da177e4 | 1046 | |
a3c00e46 | 1047 | redo_rt6_select: |
367efcb9 | 1048 | rt = rt6_select(fn, oif, strict); |
52bd4c0c | 1049 | if (rt->rt6i_nsiblings) |
367efcb9 | 1050 | rt = rt6_multipath_select(rt, fl6, oif, strict); |
a3c00e46 MKL |
1051 | if (rt == net->ipv6.ip6_null_entry) { |
1052 | fn = fib6_backtrack(fn, &fl6->saddr); | |
1053 | if (fn) | |
1054 | goto redo_rt6_select; | |
367efcb9 MKL |
1055 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
1056 | /* also consider unreachable route */ | |
1057 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
1058 | fn = saved_fn; | |
1059 | goto redo_rt6_select; | |
367efcb9 | 1060 | } |
a3c00e46 MKL |
1061 | } |
1062 | ||
fb9de91e | 1063 | |
3da59bd9 | 1064 | if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) { |
d52d3997 MKL |
1065 | dst_use(&rt->dst, jiffies); |
1066 | read_unlock_bh(&table->tb6_lock); | |
1067 | ||
1068 | rt6_dst_from_metrics_check(rt); | |
1069 | return rt; | |
3da59bd9 MKL |
1070 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
1071 | !(rt->rt6i_flags & RTF_GATEWAY))) { | |
1072 | /* Create a RTF_CACHE clone which will not be | |
1073 | * owned by the fib6 tree. It is for the special case where | |
1074 | * the daddr in the skb during the neighbor look-up is different | |
1075 | * from the fl6->daddr used to look-up route here. | |
1076 | */ | |
1077 | ||
1078 | struct rt6_info *uncached_rt; | |
1079 | ||
d52d3997 MKL |
1080 | dst_use(&rt->dst, jiffies); |
1081 | read_unlock_bh(&table->tb6_lock); | |
1082 | ||
3da59bd9 MKL |
1083 | uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL); |
1084 | dst_release(&rt->dst); | |
c71099ac | 1085 | |
3da59bd9 | 1086 | if (uncached_rt) |
8d0b94af | 1087 | rt6_uncached_list_add(uncached_rt); |
3da59bd9 MKL |
1088 | else |
1089 | uncached_rt = net->ipv6.ip6_null_entry; | |
d52d3997 | 1090 | |
3da59bd9 MKL |
1091 | dst_hold(&uncached_rt->dst); |
1092 | return uncached_rt; | |
3da59bd9 | 1093 | |
d52d3997 MKL |
1094 | } else { |
1095 | /* Get a percpu copy */ | |
1096 | ||
1097 | struct rt6_info *pcpu_rt; | |
1098 | ||
1099 | rt->dst.lastuse = jiffies; | |
1100 | rt->dst.__use++; | |
1101 | pcpu_rt = rt6_get_pcpu_route(rt); | |
d52d3997 | 1102 | |
9c7370a1 MKL |
1103 | if (pcpu_rt) { |
1104 | read_unlock_bh(&table->tb6_lock); | |
1105 | } else { | |
1106 | /* We have to do the read_unlock first | |
1107 | * because rt6_make_pcpu_route() may trigger | |
1108 | * ip6_dst_gc() which will take the write_lock. | |
1109 | */ | |
1110 | dst_hold(&rt->dst); | |
1111 | read_unlock_bh(&table->tb6_lock); | |
a73e4195 | 1112 | pcpu_rt = rt6_make_pcpu_route(rt); |
9c7370a1 MKL |
1113 | dst_release(&rt->dst); |
1114 | } | |
d52d3997 MKL |
1115 | |
1116 | return pcpu_rt; | |
9c7370a1 | 1117 | |
d52d3997 | 1118 | } |
1da177e4 LT |
1119 | } |
1120 | ||
8ed67789 | 1121 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 1122 | struct flowi6 *fl6, int flags) |
4acad72d | 1123 | { |
4c9483b2 | 1124 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
1125 | } |
1126 | ||
72331bc0 SL |
1127 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
1128 | struct net_device *dev, | |
1129 | struct flowi6 *fl6, int flags) | |
1130 | { | |
1131 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1132 | flags |= RT6_LOOKUP_F_IFACE; | |
1133 | ||
1134 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1135 | } | |
1136 | ||
c71099ac TG |
1137 | void ip6_route_input(struct sk_buff *skb) |
1138 | { | |
b71d1d42 | 1139 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1140 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1141 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
904af04d | 1142 | struct ip_tunnel_info *tun_info; |
4c9483b2 DM |
1143 | struct flowi6 fl6 = { |
1144 | .flowi6_iif = skb->dev->ifindex, | |
1145 | .daddr = iph->daddr, | |
1146 | .saddr = iph->saddr, | |
6502ca52 | 1147 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1148 | .flowi6_mark = skb->mark, |
1149 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1150 | }; |
adaa70bb | 1151 | |
904af04d | 1152 | tun_info = skb_tunnel_info(skb); |
46fa062a | 1153 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 1154 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
06e9d040 | 1155 | skb_dst_drop(skb); |
72331bc0 | 1156 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1157 | } |
1158 | ||
8ed67789 | 1159 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1160 | struct flowi6 *fl6, int flags) |
1da177e4 | 1161 | { |
4c9483b2 | 1162 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1163 | } |
1164 | ||
67ba4152 | 1165 | struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 1166 | struct flowi6 *fl6) |
c71099ac TG |
1167 | { |
1168 | int flags = 0; | |
1169 | ||
1fb9489b | 1170 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1171 | |
741a11d9 DA |
1172 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
1173 | fl6->flowi6_oif) | |
77d16f45 | 1174 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1175 | |
4c9483b2 | 1176 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 1177 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1178 | else if (sk) |
1179 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1180 | |
4c9483b2 | 1181 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 | 1182 | } |
7159039a | 1183 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 1184 | |
2774c131 | 1185 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1186 | { |
5c1e6aa3 | 1187 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1188 | struct dst_entry *new = NULL; |
1189 | ||
f5b0a874 | 1190 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1191 | if (rt) { |
d8d1f30b | 1192 | new = &rt->dst; |
14e50e57 | 1193 | |
8104891b | 1194 | memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); |
8104891b | 1195 | |
14e50e57 | 1196 | new->__use = 1; |
352e512c | 1197 | new->input = dst_discard; |
ede2059d | 1198 | new->output = dst_discard_out; |
14e50e57 | 1199 | |
21efcfa0 ED |
1200 | if (dst_metrics_read_only(&ort->dst)) |
1201 | new->_metrics = ort->dst._metrics; | |
1202 | else | |
1203 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
1204 | rt->rt6i_idev = ort->rt6i_idev; |
1205 | if (rt->rt6i_idev) | |
1206 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1207 | |
4e3fd7a0 | 1208 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 | 1209 | rt->rt6i_flags = ort->rt6i_flags; |
14e50e57 DM |
1210 | rt->rt6i_metric = 0; |
1211 | ||
1212 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1213 | #ifdef CONFIG_IPV6_SUBTREES | |
1214 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1215 | #endif | |
1216 | ||
1217 | dst_free(new); | |
1218 | } | |
1219 | ||
69ead7af DM |
1220 | dst_release(dst_orig); |
1221 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1222 | } |
14e50e57 | 1223 | |
1da177e4 LT |
1224 | /* |
1225 | * Destination cache support functions | |
1226 | */ | |
1227 | ||
4b32b5ad MKL |
1228 | static void rt6_dst_from_metrics_check(struct rt6_info *rt) |
1229 | { | |
1230 | if (rt->dst.from && | |
1231 | dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from)) | |
1232 | dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true); | |
1233 | } | |
1234 | ||
3da59bd9 MKL |
1235 | static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie) |
1236 | { | |
1237 | if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) | |
1238 | return NULL; | |
1239 | ||
1240 | if (rt6_check_expired(rt)) | |
1241 | return NULL; | |
1242 | ||
1243 | return &rt->dst; | |
1244 | } | |
1245 | ||
1246 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie) | |
1247 | { | |
1248 | if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
1249 | rt6_check((struct rt6_info *)(rt->dst.from), cookie)) | |
1250 | return &rt->dst; | |
1251 | else | |
1252 | return NULL; | |
1253 | } | |
1254 | ||
1da177e4 LT |
1255 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
1256 | { | |
1257 | struct rt6_info *rt; | |
1258 | ||
1259 | rt = (struct rt6_info *) dst; | |
1260 | ||
6f3118b5 ND |
1261 | /* All IPV6 dsts are created with ->obsolete set to the value |
1262 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1263 | * into this function always. | |
1264 | */ | |
e3bc10bd | 1265 | |
4b32b5ad MKL |
1266 | rt6_dst_from_metrics_check(rt); |
1267 | ||
d52d3997 | 1268 | if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE)) |
3da59bd9 MKL |
1269 | return rt6_dst_from_check(rt, cookie); |
1270 | else | |
1271 | return rt6_check(rt, cookie); | |
1da177e4 LT |
1272 | } |
1273 | ||
1274 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1275 | { | |
1276 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1277 | ||
1278 | if (rt) { | |
54c1a859 YH |
1279 | if (rt->rt6i_flags & RTF_CACHE) { |
1280 | if (rt6_check_expired(rt)) { | |
1281 | ip6_del_rt(rt); | |
1282 | dst = NULL; | |
1283 | } | |
1284 | } else { | |
1da177e4 | 1285 | dst_release(dst); |
54c1a859 YH |
1286 | dst = NULL; |
1287 | } | |
1da177e4 | 1288 | } |
54c1a859 | 1289 | return dst; |
1da177e4 LT |
1290 | } |
1291 | ||
1292 | static void ip6_link_failure(struct sk_buff *skb) | |
1293 | { | |
1294 | struct rt6_info *rt; | |
1295 | ||
3ffe533c | 1296 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1297 | |
adf30907 | 1298 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1299 | if (rt) { |
1eb4f758 HFS |
1300 | if (rt->rt6i_flags & RTF_CACHE) { |
1301 | dst_hold(&rt->dst); | |
8e3d5be7 | 1302 | ip6_del_rt(rt); |
1eb4f758 | 1303 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { |
1da177e4 | 1304 | rt->rt6i_node->fn_sernum = -1; |
1eb4f758 | 1305 | } |
1da177e4 LT |
1306 | } |
1307 | } | |
1308 | ||
45e4fd26 MKL |
1309 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
1310 | { | |
1311 | struct net *net = dev_net(rt->dst.dev); | |
1312 | ||
1313 | rt->rt6i_flags |= RTF_MODIFIED; | |
1314 | rt->rt6i_pmtu = mtu; | |
1315 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
1316 | } | |
1317 | ||
1318 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, | |
1319 | const struct ipv6hdr *iph, u32 mtu) | |
1da177e4 | 1320 | { |
67ba4152 | 1321 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 1322 | |
45e4fd26 MKL |
1323 | if (rt6->rt6i_flags & RTF_LOCAL) |
1324 | return; | |
81aded24 | 1325 | |
45e4fd26 MKL |
1326 | dst_confirm(dst); |
1327 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); | |
1328 | if (mtu >= dst_mtu(dst)) | |
1329 | return; | |
9d289715 | 1330 | |
45e4fd26 MKL |
1331 | if (rt6->rt6i_flags & RTF_CACHE) { |
1332 | rt6_do_update_pmtu(rt6, mtu); | |
1333 | } else { | |
1334 | const struct in6_addr *daddr, *saddr; | |
1335 | struct rt6_info *nrt6; | |
1336 | ||
1337 | if (iph) { | |
1338 | daddr = &iph->daddr; | |
1339 | saddr = &iph->saddr; | |
1340 | } else if (sk) { | |
1341 | daddr = &sk->sk_v6_daddr; | |
1342 | saddr = &inet6_sk(sk)->saddr; | |
1343 | } else { | |
1344 | return; | |
1345 | } | |
1346 | nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr); | |
1347 | if (nrt6) { | |
1348 | rt6_do_update_pmtu(nrt6, mtu); | |
1349 | ||
1350 | /* ip6_ins_rt(nrt6) will bump the | |
1351 | * rt6->rt6i_node->fn_sernum | |
1352 | * which will fail the next rt6_check() and | |
1353 | * invalidate the sk->sk_dst_cache. | |
1354 | */ | |
1355 | ip6_ins_rt(nrt6); | |
1356 | } | |
1da177e4 LT |
1357 | } |
1358 | } | |
1359 | ||
45e4fd26 MKL |
1360 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1361 | struct sk_buff *skb, u32 mtu) | |
1362 | { | |
1363 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu); | |
1364 | } | |
1365 | ||
42ae66c8 DM |
1366 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
1367 | int oif, u32 mark) | |
81aded24 DM |
1368 | { |
1369 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1370 | struct dst_entry *dst; | |
1371 | struct flowi6 fl6; | |
1372 | ||
1373 | memset(&fl6, 0, sizeof(fl6)); | |
1374 | fl6.flowi6_oif = oif; | |
1b3c61dc | 1375 | fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); |
81aded24 DM |
1376 | fl6.daddr = iph->daddr; |
1377 | fl6.saddr = iph->saddr; | |
6502ca52 | 1378 | fl6.flowlabel = ip6_flowinfo(iph); |
81aded24 DM |
1379 | |
1380 | dst = ip6_route_output(net, NULL, &fl6); | |
1381 | if (!dst->error) | |
45e4fd26 | 1382 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu)); |
81aded24 DM |
1383 | dst_release(dst); |
1384 | } | |
1385 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1386 | ||
1387 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1388 | { | |
1389 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
1390 | sk->sk_bound_dev_if, sk->sk_mark); | |
1391 | } | |
1392 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1393 | ||
b55b76b2 DJ |
1394 | /* Handle redirects */ |
1395 | struct ip6rd_flowi { | |
1396 | struct flowi6 fl6; | |
1397 | struct in6_addr gateway; | |
1398 | }; | |
1399 | ||
1400 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
1401 | struct fib6_table *table, | |
1402 | struct flowi6 *fl6, | |
1403 | int flags) | |
1404 | { | |
1405 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
1406 | struct rt6_info *rt; | |
1407 | struct fib6_node *fn; | |
1408 | ||
1409 | /* Get the "current" route for this destination and | |
1410 | * check if the redirect has come from approriate router. | |
1411 | * | |
1412 | * RFC 4861 specifies that redirects should only be | |
1413 | * accepted if they come from the nexthop to the target. | |
1414 | * Due to the way the routes are chosen, this notion | |
1415 | * is a bit fuzzy and one might need to check all possible | |
1416 | * routes. | |
1417 | */ | |
1418 | ||
1419 | read_lock_bh(&table->tb6_lock); | |
1420 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); | |
1421 | restart: | |
1422 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { | |
1423 | if (rt6_check_expired(rt)) | |
1424 | continue; | |
1425 | if (rt->dst.error) | |
1426 | break; | |
1427 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1428 | continue; | |
1429 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) | |
1430 | continue; | |
1431 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) | |
1432 | continue; | |
1433 | break; | |
1434 | } | |
1435 | ||
1436 | if (!rt) | |
1437 | rt = net->ipv6.ip6_null_entry; | |
1438 | else if (rt->dst.error) { | |
1439 | rt = net->ipv6.ip6_null_entry; | |
b0a1ba59 MKL |
1440 | goto out; |
1441 | } | |
1442 | ||
1443 | if (rt == net->ipv6.ip6_null_entry) { | |
a3c00e46 MKL |
1444 | fn = fib6_backtrack(fn, &fl6->saddr); |
1445 | if (fn) | |
1446 | goto restart; | |
b55b76b2 | 1447 | } |
a3c00e46 | 1448 | |
b0a1ba59 | 1449 | out: |
b55b76b2 DJ |
1450 | dst_hold(&rt->dst); |
1451 | ||
1452 | read_unlock_bh(&table->tb6_lock); | |
1453 | ||
1454 | return rt; | |
1455 | }; | |
1456 | ||
1457 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
1458 | const struct flowi6 *fl6, | |
1459 | const struct in6_addr *gateway) | |
1460 | { | |
1461 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
1462 | struct ip6rd_flowi rdfl; | |
1463 | ||
1464 | rdfl.fl6 = *fl6; | |
1465 | rdfl.gateway = *gateway; | |
1466 | ||
1467 | return fib6_rule_lookup(net, &rdfl.fl6, | |
1468 | flags, __ip6_route_redirect); | |
1469 | } | |
1470 | ||
3a5ad2ee DM |
1471 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1472 | { | |
1473 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1474 | struct dst_entry *dst; | |
1475 | struct flowi6 fl6; | |
1476 | ||
1477 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1478 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
3a5ad2ee DM |
1479 | fl6.flowi6_oif = oif; |
1480 | fl6.flowi6_mark = mark; | |
3a5ad2ee DM |
1481 | fl6.daddr = iph->daddr; |
1482 | fl6.saddr = iph->saddr; | |
6502ca52 | 1483 | fl6.flowlabel = ip6_flowinfo(iph); |
3a5ad2ee | 1484 | |
b55b76b2 DJ |
1485 | dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
1486 | rt6_do_redirect(dst, NULL, skb); | |
3a5ad2ee DM |
1487 | dst_release(dst); |
1488 | } | |
1489 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1490 | ||
c92a59ec DJ |
1491 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
1492 | u32 mark) | |
1493 | { | |
1494 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1495 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
1496 | struct dst_entry *dst; | |
1497 | struct flowi6 fl6; | |
1498 | ||
1499 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1500 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
c92a59ec DJ |
1501 | fl6.flowi6_oif = oif; |
1502 | fl6.flowi6_mark = mark; | |
c92a59ec DJ |
1503 | fl6.daddr = msg->dest; |
1504 | fl6.saddr = iph->daddr; | |
1505 | ||
b55b76b2 DJ |
1506 | dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
1507 | rt6_do_redirect(dst, NULL, skb); | |
c92a59ec DJ |
1508 | dst_release(dst); |
1509 | } | |
1510 | ||
3a5ad2ee DM |
1511 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
1512 | { | |
1513 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1514 | } | |
1515 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1516 | ||
0dbaee3b | 1517 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1518 | { |
0dbaee3b DM |
1519 | struct net_device *dev = dst->dev; |
1520 | unsigned int mtu = dst_mtu(dst); | |
1521 | struct net *net = dev_net(dev); | |
1522 | ||
1da177e4 LT |
1523 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1524 | ||
5578689a DL |
1525 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1526 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1527 | |
1528 | /* | |
1ab1457c YH |
1529 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1530 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1531 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1532 | * rely only on pmtu discovery" |
1533 | */ | |
1534 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1535 | mtu = IPV6_MAXPLEN; | |
1536 | return mtu; | |
1537 | } | |
1538 | ||
ebb762f2 | 1539 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1540 | { |
4b32b5ad MKL |
1541 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
1542 | unsigned int mtu = rt->rt6i_pmtu; | |
d33e4553 | 1543 | struct inet6_dev *idev; |
618f9bc7 | 1544 | |
4b32b5ad MKL |
1545 | if (mtu) |
1546 | goto out; | |
1547 | ||
1548 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 1549 | if (mtu) |
30f78d8e | 1550 | goto out; |
618f9bc7 SK |
1551 | |
1552 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1553 | |
1554 | rcu_read_lock(); | |
1555 | idev = __in6_dev_get(dst->dev); | |
1556 | if (idev) | |
1557 | mtu = idev->cnf.mtu6; | |
1558 | rcu_read_unlock(); | |
1559 | ||
30f78d8e ED |
1560 | out: |
1561 | return min_t(unsigned int, mtu, IP6_MAX_MTU); | |
d33e4553 DM |
1562 | } |
1563 | ||
3b00944c YH |
1564 | static struct dst_entry *icmp6_dst_gc_list; |
1565 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1566 | |
3b00944c | 1567 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1568 | struct flowi6 *fl6) |
1da177e4 | 1569 | { |
87a11578 | 1570 | struct dst_entry *dst; |
1da177e4 LT |
1571 | struct rt6_info *rt; |
1572 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1573 | struct net *net = dev_net(dev); |
1da177e4 | 1574 | |
38308473 | 1575 | if (unlikely(!idev)) |
122bdf67 | 1576 | return ERR_PTR(-ENODEV); |
1da177e4 | 1577 | |
ad706862 | 1578 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 1579 | if (unlikely(!rt)) { |
1da177e4 | 1580 | in6_dev_put(idev); |
87a11578 | 1581 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1582 | goto out; |
1583 | } | |
1584 | ||
8e2ec639 YZ |
1585 | rt->dst.flags |= DST_HOST; |
1586 | rt->dst.output = ip6_output; | |
d8d1f30b | 1587 | atomic_set(&rt->dst.__refcnt, 1); |
550bab42 | 1588 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 1589 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1590 | rt->rt6i_dst.plen = 128; |
1591 | rt->rt6i_idev = idev; | |
14edd87d | 1592 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1593 | |
3b00944c | 1594 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1595 | rt->dst.next = icmp6_dst_gc_list; |
1596 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1597 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1598 | |
5578689a | 1599 | fib6_force_start_gc(net); |
1da177e4 | 1600 | |
87a11578 DM |
1601 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1602 | ||
1da177e4 | 1603 | out: |
87a11578 | 1604 | return dst; |
1da177e4 LT |
1605 | } |
1606 | ||
3d0f24a7 | 1607 | int icmp6_dst_gc(void) |
1da177e4 | 1608 | { |
e9476e95 | 1609 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1610 | int more = 0; |
1da177e4 | 1611 | |
3b00944c YH |
1612 | spin_lock_bh(&icmp6_dst_lock); |
1613 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1614 | |
1da177e4 LT |
1615 | while ((dst = *pprev) != NULL) { |
1616 | if (!atomic_read(&dst->__refcnt)) { | |
1617 | *pprev = dst->next; | |
1618 | dst_free(dst); | |
1da177e4 LT |
1619 | } else { |
1620 | pprev = &dst->next; | |
3d0f24a7 | 1621 | ++more; |
1da177e4 LT |
1622 | } |
1623 | } | |
1624 | ||
3b00944c | 1625 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1626 | |
3d0f24a7 | 1627 | return more; |
1da177e4 LT |
1628 | } |
1629 | ||
1e493d19 DM |
1630 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1631 | void *arg) | |
1632 | { | |
1633 | struct dst_entry *dst, **pprev; | |
1634 | ||
1635 | spin_lock_bh(&icmp6_dst_lock); | |
1636 | pprev = &icmp6_dst_gc_list; | |
1637 | while ((dst = *pprev) != NULL) { | |
1638 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1639 | if (func(rt, arg)) { | |
1640 | *pprev = dst->next; | |
1641 | dst_free(dst); | |
1642 | } else { | |
1643 | pprev = &dst->next; | |
1644 | } | |
1645 | } | |
1646 | spin_unlock_bh(&icmp6_dst_lock); | |
1647 | } | |
1648 | ||
569d3645 | 1649 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1650 | { |
86393e52 | 1651 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1652 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1653 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1654 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1655 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1656 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1657 | int entries; |
7019b78e | 1658 | |
fc66f95c | 1659 | entries = dst_entries_get_fast(ops); |
49a18d86 | 1660 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 1661 | entries <= rt_max_size) |
1da177e4 LT |
1662 | goto out; |
1663 | ||
6891a346 | 1664 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 1665 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
1666 | entries = dst_entries_get_slow(ops); |
1667 | if (entries < ops->gc_thresh) | |
7019b78e | 1668 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1669 | out: |
7019b78e | 1670 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1671 | return entries > rt_max_size; |
1da177e4 LT |
1672 | } |
1673 | ||
e715b6d3 FW |
1674 | static int ip6_convert_metrics(struct mx6_config *mxc, |
1675 | const struct fib6_config *cfg) | |
1676 | { | |
c3a8d947 | 1677 | bool ecn_ca = false; |
e715b6d3 FW |
1678 | struct nlattr *nla; |
1679 | int remaining; | |
1680 | u32 *mp; | |
1681 | ||
63159f29 | 1682 | if (!cfg->fc_mx) |
e715b6d3 FW |
1683 | return 0; |
1684 | ||
1685 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1686 | if (unlikely(!mp)) | |
1687 | return -ENOMEM; | |
1688 | ||
1689 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1690 | int type = nla_type(nla); | |
1bb14807 | 1691 | u32 val; |
e715b6d3 | 1692 | |
1bb14807 DB |
1693 | if (!type) |
1694 | continue; | |
1695 | if (unlikely(type > RTAX_MAX)) | |
1696 | goto err; | |
ea697639 | 1697 | |
1bb14807 DB |
1698 | if (type == RTAX_CC_ALGO) { |
1699 | char tmp[TCP_CA_NAME_MAX]; | |
e715b6d3 | 1700 | |
1bb14807 | 1701 | nla_strlcpy(tmp, nla, sizeof(tmp)); |
c3a8d947 | 1702 | val = tcp_ca_get_key_by_name(tmp, &ecn_ca); |
1bb14807 DB |
1703 | if (val == TCP_CA_UNSPEC) |
1704 | goto err; | |
1705 | } else { | |
1706 | val = nla_get_u32(nla); | |
e715b6d3 | 1707 | } |
b8d3e416 DB |
1708 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
1709 | goto err; | |
1bb14807 DB |
1710 | |
1711 | mp[type - 1] = val; | |
1712 | __set_bit(type - 1, mxc->mx_valid); | |
e715b6d3 FW |
1713 | } |
1714 | ||
c3a8d947 DB |
1715 | if (ecn_ca) { |
1716 | __set_bit(RTAX_FEATURES - 1, mxc->mx_valid); | |
1717 | mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; | |
1718 | } | |
e715b6d3 | 1719 | |
c3a8d947 | 1720 | mxc->mx = mp; |
e715b6d3 FW |
1721 | return 0; |
1722 | err: | |
1723 | kfree(mp); | |
1724 | return -EINVAL; | |
1725 | } | |
1da177e4 | 1726 | |
8c5b83f0 | 1727 | static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg) |
1da177e4 | 1728 | { |
5578689a | 1729 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1730 | struct rt6_info *rt = NULL; |
1731 | struct net_device *dev = NULL; | |
1732 | struct inet6_dev *idev = NULL; | |
c71099ac | 1733 | struct fib6_table *table; |
1da177e4 | 1734 | int addr_type; |
8c5b83f0 | 1735 | int err = -EINVAL; |
1da177e4 | 1736 | |
86872cb5 | 1737 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
8c5b83f0 | 1738 | goto out; |
1da177e4 | 1739 | #ifndef CONFIG_IPV6_SUBTREES |
86872cb5 | 1740 | if (cfg->fc_src_len) |
8c5b83f0 | 1741 | goto out; |
1da177e4 | 1742 | #endif |
86872cb5 | 1743 | if (cfg->fc_ifindex) { |
1da177e4 | 1744 | err = -ENODEV; |
5578689a | 1745 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1746 | if (!dev) |
1747 | goto out; | |
1748 | idev = in6_dev_get(dev); | |
1749 | if (!idev) | |
1750 | goto out; | |
1751 | } | |
1752 | ||
86872cb5 TG |
1753 | if (cfg->fc_metric == 0) |
1754 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1755 | |
d71314b4 | 1756 | err = -ENOBUFS; |
38308473 DM |
1757 | if (cfg->fc_nlinfo.nlh && |
1758 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1759 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1760 | if (!table) { |
f3213831 | 1761 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1762 | table = fib6_new_table(net, cfg->fc_table); |
1763 | } | |
1764 | } else { | |
1765 | table = fib6_new_table(net, cfg->fc_table); | |
1766 | } | |
38308473 DM |
1767 | |
1768 | if (!table) | |
c71099ac | 1769 | goto out; |
c71099ac | 1770 | |
ad706862 MKL |
1771 | rt = ip6_dst_alloc(net, NULL, |
1772 | (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT); | |
1da177e4 | 1773 | |
38308473 | 1774 | if (!rt) { |
1da177e4 LT |
1775 | err = -ENOMEM; |
1776 | goto out; | |
1777 | } | |
1778 | ||
1716a961 G |
1779 | if (cfg->fc_flags & RTF_EXPIRES) |
1780 | rt6_set_expires(rt, jiffies + | |
1781 | clock_t_to_jiffies(cfg->fc_expires)); | |
1782 | else | |
1783 | rt6_clean_expires(rt); | |
1da177e4 | 1784 | |
86872cb5 TG |
1785 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1786 | cfg->fc_protocol = RTPROT_BOOT; | |
1787 | rt->rt6i_protocol = cfg->fc_protocol; | |
1788 | ||
1789 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1790 | |
1791 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1792 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1793 | else if (cfg->fc_flags & RTF_LOCAL) |
1794 | rt->dst.input = ip6_input; | |
1da177e4 | 1795 | else |
d8d1f30b | 1796 | rt->dst.input = ip6_forward; |
1da177e4 | 1797 | |
d8d1f30b | 1798 | rt->dst.output = ip6_output; |
1da177e4 | 1799 | |
19e42e45 RP |
1800 | if (cfg->fc_encap) { |
1801 | struct lwtunnel_state *lwtstate; | |
1802 | ||
1803 | err = lwtunnel_build_state(dev, cfg->fc_encap_type, | |
127eb7cd TH |
1804 | cfg->fc_encap, AF_INET6, cfg, |
1805 | &lwtstate); | |
19e42e45 RP |
1806 | if (err) |
1807 | goto out; | |
61adedf3 JB |
1808 | rt->dst.lwtstate = lwtstate_get(lwtstate); |
1809 | if (lwtunnel_output_redirect(rt->dst.lwtstate)) { | |
1810 | rt->dst.lwtstate->orig_output = rt->dst.output; | |
1811 | rt->dst.output = lwtunnel_output; | |
25368623 | 1812 | } |
61adedf3 JB |
1813 | if (lwtunnel_input_redirect(rt->dst.lwtstate)) { |
1814 | rt->dst.lwtstate->orig_input = rt->dst.input; | |
1815 | rt->dst.input = lwtunnel_input; | |
25368623 | 1816 | } |
19e42e45 RP |
1817 | } |
1818 | ||
86872cb5 TG |
1819 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1820 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
afc4eef8 | 1821 | if (rt->rt6i_dst.plen == 128) |
e5fd387a | 1822 | rt->dst.flags |= DST_HOST; |
e5fd387a | 1823 | |
1da177e4 | 1824 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1825 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1826 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1827 | #endif |
1828 | ||
86872cb5 | 1829 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1830 | |
1831 | /* We cannot add true routes via loopback here, | |
1832 | they would result in kernel looping; promote them to reject routes | |
1833 | */ | |
86872cb5 | 1834 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1835 | (dev && (dev->flags & IFF_LOOPBACK) && |
1836 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1837 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1838 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1839 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1840 | if (dev) { |
1841 | dev_put(dev); | |
1842 | in6_dev_put(idev); | |
1843 | } | |
5578689a | 1844 | dev = net->loopback_dev; |
1da177e4 LT |
1845 | dev_hold(dev); |
1846 | idev = in6_dev_get(dev); | |
1847 | if (!idev) { | |
1848 | err = -ENODEV; | |
1849 | goto out; | |
1850 | } | |
1851 | } | |
1da177e4 | 1852 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1853 | switch (cfg->fc_type) { |
1854 | case RTN_BLACKHOLE: | |
1855 | rt->dst.error = -EINVAL; | |
ede2059d | 1856 | rt->dst.output = dst_discard_out; |
7150aede | 1857 | rt->dst.input = dst_discard; |
ef2c7d7b ND |
1858 | break; |
1859 | case RTN_PROHIBIT: | |
1860 | rt->dst.error = -EACCES; | |
7150aede K |
1861 | rt->dst.output = ip6_pkt_prohibit_out; |
1862 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 1863 | break; |
b4949ab2 | 1864 | case RTN_THROW: |
0315e382 | 1865 | case RTN_UNREACHABLE: |
ef2c7d7b | 1866 | default: |
7150aede | 1867 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
0315e382 NF |
1868 | : (cfg->fc_type == RTN_UNREACHABLE) |
1869 | ? -EHOSTUNREACH : -ENETUNREACH; | |
7150aede K |
1870 | rt->dst.output = ip6_pkt_discard_out; |
1871 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
1872 | break; |
1873 | } | |
1da177e4 LT |
1874 | goto install_route; |
1875 | } | |
1876 | ||
86872cb5 | 1877 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1878 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1879 | int gwa_type; |
1880 | ||
86872cb5 | 1881 | gw_addr = &cfg->fc_gateway; |
330567b7 | 1882 | gwa_type = ipv6_addr_type(gw_addr); |
48ed7b26 FW |
1883 | |
1884 | /* if gw_addr is local we will fail to detect this in case | |
1885 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
1886 | * will return already-added prefix route via interface that | |
1887 | * prefix route was assigned to, which might be non-loopback. | |
1888 | */ | |
1889 | err = -EINVAL; | |
330567b7 FW |
1890 | if (ipv6_chk_addr_and_flags(net, gw_addr, |
1891 | gwa_type & IPV6_ADDR_LINKLOCAL ? | |
1892 | dev : NULL, 0, 0)) | |
48ed7b26 FW |
1893 | goto out; |
1894 | ||
4e3fd7a0 | 1895 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1896 | |
1897 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1898 | struct rt6_info *grt; | |
1899 | ||
1900 | /* IPv6 strictly inhibits using not link-local | |
1901 | addresses as nexthop address. | |
1902 | Otherwise, router will not able to send redirects. | |
1903 | It is very good, but in some (rare!) circumstances | |
1904 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1905 | some exceptions. --ANK | |
1906 | */ | |
38308473 | 1907 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1908 | goto out; |
1909 | ||
5578689a | 1910 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1911 | |
1912 | err = -EHOSTUNREACH; | |
38308473 | 1913 | if (!grt) |
1da177e4 LT |
1914 | goto out; |
1915 | if (dev) { | |
d1918542 | 1916 | if (dev != grt->dst.dev) { |
94e187c0 | 1917 | ip6_rt_put(grt); |
1da177e4 LT |
1918 | goto out; |
1919 | } | |
1920 | } else { | |
d1918542 | 1921 | dev = grt->dst.dev; |
1da177e4 LT |
1922 | idev = grt->rt6i_idev; |
1923 | dev_hold(dev); | |
1924 | in6_dev_hold(grt->rt6i_idev); | |
1925 | } | |
38308473 | 1926 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1927 | err = 0; |
94e187c0 | 1928 | ip6_rt_put(grt); |
1da177e4 LT |
1929 | |
1930 | if (err) | |
1931 | goto out; | |
1932 | } | |
1933 | err = -EINVAL; | |
38308473 | 1934 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1935 | goto out; |
1936 | } | |
1937 | ||
1938 | err = -ENODEV; | |
38308473 | 1939 | if (!dev) |
1da177e4 LT |
1940 | goto out; |
1941 | ||
c3968a85 DW |
1942 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1943 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1944 | err = -EINVAL; | |
1945 | goto out; | |
1946 | } | |
4e3fd7a0 | 1947 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1948 | rt->rt6i_prefsrc.plen = 128; |
1949 | } else | |
1950 | rt->rt6i_prefsrc.plen = 0; | |
1951 | ||
86872cb5 | 1952 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1953 | |
1954 | install_route: | |
d8d1f30b | 1955 | rt->dst.dev = dev; |
1da177e4 | 1956 | rt->rt6i_idev = idev; |
c71099ac | 1957 | rt->rt6i_table = table; |
63152fc0 | 1958 | |
c346dca1 | 1959 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1960 | |
8c5b83f0 | 1961 | return rt; |
6b9ea5a6 RP |
1962 | out: |
1963 | if (dev) | |
1964 | dev_put(dev); | |
1965 | if (idev) | |
1966 | in6_dev_put(idev); | |
1967 | if (rt) | |
1968 | dst_free(&rt->dst); | |
1969 | ||
8c5b83f0 | 1970 | return ERR_PTR(err); |
6b9ea5a6 RP |
1971 | } |
1972 | ||
1973 | int ip6_route_add(struct fib6_config *cfg) | |
1974 | { | |
1975 | struct mx6_config mxc = { .mx = NULL, }; | |
8c5b83f0 | 1976 | struct rt6_info *rt; |
6b9ea5a6 RP |
1977 | int err; |
1978 | ||
8c5b83f0 RP |
1979 | rt = ip6_route_info_create(cfg); |
1980 | if (IS_ERR(rt)) { | |
1981 | err = PTR_ERR(rt); | |
1982 | rt = NULL; | |
6b9ea5a6 | 1983 | goto out; |
8c5b83f0 | 1984 | } |
6b9ea5a6 | 1985 | |
e715b6d3 FW |
1986 | err = ip6_convert_metrics(&mxc, cfg); |
1987 | if (err) | |
1988 | goto out; | |
1da177e4 | 1989 | |
e715b6d3 FW |
1990 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc); |
1991 | ||
1992 | kfree(mxc.mx); | |
6b9ea5a6 | 1993 | |
e715b6d3 | 1994 | return err; |
1da177e4 | 1995 | out: |
1da177e4 | 1996 | if (rt) |
d8d1f30b | 1997 | dst_free(&rt->dst); |
6b9ea5a6 | 1998 | |
1da177e4 LT |
1999 | return err; |
2000 | } | |
2001 | ||
86872cb5 | 2002 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2003 | { |
2004 | int err; | |
c71099ac | 2005 | struct fib6_table *table; |
d1918542 | 2006 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 2007 | |
8e3d5be7 MKL |
2008 | if (rt == net->ipv6.ip6_null_entry || |
2009 | rt->dst.flags & DST_NOCACHE) { | |
6825a26c G |
2010 | err = -ENOENT; |
2011 | goto out; | |
2012 | } | |
6c813a72 | 2013 | |
c71099ac TG |
2014 | table = rt->rt6i_table; |
2015 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 2016 | err = fib6_del(rt, info); |
c71099ac | 2017 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 2018 | |
6825a26c | 2019 | out: |
94e187c0 | 2020 | ip6_rt_put(rt); |
1da177e4 LT |
2021 | return err; |
2022 | } | |
2023 | ||
e0a1ad73 TG |
2024 | int ip6_del_rt(struct rt6_info *rt) |
2025 | { | |
4d1169c1 | 2026 | struct nl_info info = { |
d1918542 | 2027 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 2028 | }; |
528c4ceb | 2029 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
2030 | } |
2031 | ||
86872cb5 | 2032 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 2033 | { |
c71099ac | 2034 | struct fib6_table *table; |
1da177e4 LT |
2035 | struct fib6_node *fn; |
2036 | struct rt6_info *rt; | |
2037 | int err = -ESRCH; | |
2038 | ||
5578689a | 2039 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 2040 | if (!table) |
c71099ac TG |
2041 | return err; |
2042 | ||
2043 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 2044 | |
c71099ac | 2045 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
2046 | &cfg->fc_dst, cfg->fc_dst_len, |
2047 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 2048 | |
1da177e4 | 2049 | if (fn) { |
d8d1f30b | 2050 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
1f56a01f MKL |
2051 | if ((rt->rt6i_flags & RTF_CACHE) && |
2052 | !(cfg->fc_flags & RTF_CACHE)) | |
2053 | continue; | |
86872cb5 | 2054 | if (cfg->fc_ifindex && |
d1918542 DM |
2055 | (!rt->dst.dev || |
2056 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 2057 | continue; |
86872cb5 TG |
2058 | if (cfg->fc_flags & RTF_GATEWAY && |
2059 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 2060 | continue; |
86872cb5 | 2061 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 2062 | continue; |
d8d1f30b | 2063 | dst_hold(&rt->dst); |
c71099ac | 2064 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 2065 | |
86872cb5 | 2066 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
2067 | } |
2068 | } | |
c71099ac | 2069 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2070 | |
2071 | return err; | |
2072 | } | |
2073 | ||
6700c270 | 2074 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 2075 | { |
e8599ff4 | 2076 | struct net *net = dev_net(skb->dev); |
a6279458 | 2077 | struct netevent_redirect netevent; |
e8599ff4 | 2078 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
2079 | struct ndisc_options ndopts; |
2080 | struct inet6_dev *in6_dev; | |
2081 | struct neighbour *neigh; | |
71bcdba0 | 2082 | struct rd_msg *msg; |
6e157b6a DM |
2083 | int optlen, on_link; |
2084 | u8 *lladdr; | |
e8599ff4 | 2085 | |
29a3cad5 | 2086 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 2087 | optlen -= sizeof(*msg); |
e8599ff4 DM |
2088 | |
2089 | if (optlen < 0) { | |
6e157b6a | 2090 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
2091 | return; |
2092 | } | |
2093 | ||
71bcdba0 | 2094 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 2095 | |
71bcdba0 | 2096 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 2097 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
2098 | return; |
2099 | } | |
2100 | ||
6e157b6a | 2101 | on_link = 0; |
71bcdba0 | 2102 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 2103 | on_link = 1; |
71bcdba0 | 2104 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 2105 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 2106 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
2107 | return; |
2108 | } | |
2109 | ||
2110 | in6_dev = __in6_dev_get(skb->dev); | |
2111 | if (!in6_dev) | |
2112 | return; | |
2113 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
2114 | return; | |
2115 | ||
2116 | /* RFC2461 8.1: | |
2117 | * The IP source address of the Redirect MUST be the same as the current | |
2118 | * first-hop router for the specified ICMP Destination Address. | |
2119 | */ | |
2120 | ||
71bcdba0 | 2121 | if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
2122 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
2123 | return; | |
2124 | } | |
6e157b6a DM |
2125 | |
2126 | lladdr = NULL; | |
e8599ff4 DM |
2127 | if (ndopts.nd_opts_tgt_lladdr) { |
2128 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
2129 | skb->dev); | |
2130 | if (!lladdr) { | |
2131 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
2132 | return; | |
2133 | } | |
2134 | } | |
2135 | ||
6e157b6a DM |
2136 | rt = (struct rt6_info *) dst; |
2137 | if (rt == net->ipv6.ip6_null_entry) { | |
2138 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); | |
e8599ff4 | 2139 | return; |
6e157b6a | 2140 | } |
e8599ff4 | 2141 | |
6e157b6a DM |
2142 | /* Redirect received -> path was valid. |
2143 | * Look, redirects are sent only in response to data packets, | |
2144 | * so that this nexthop apparently is reachable. --ANK | |
2145 | */ | |
2146 | dst_confirm(&rt->dst); | |
a6279458 | 2147 | |
71bcdba0 | 2148 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
2149 | if (!neigh) |
2150 | return; | |
a6279458 | 2151 | |
1da177e4 LT |
2152 | /* |
2153 | * We have finally decided to accept it. | |
2154 | */ | |
2155 | ||
1ab1457c | 2156 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
2157 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
2158 | NEIGH_UPDATE_F_OVERRIDE| | |
2159 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
2160 | NEIGH_UPDATE_F_ISROUTER)) | |
2161 | ); | |
2162 | ||
83a09abd | 2163 | nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL); |
38308473 | 2164 | if (!nrt) |
1da177e4 LT |
2165 | goto out; |
2166 | ||
2167 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
2168 | if (on_link) | |
2169 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
2170 | ||
4e3fd7a0 | 2171 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 2172 | |
40e22e8f | 2173 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
2174 | goto out; |
2175 | ||
d8d1f30b CG |
2176 | netevent.old = &rt->dst; |
2177 | netevent.new = &nrt->dst; | |
71bcdba0 | 2178 | netevent.daddr = &msg->dest; |
60592833 | 2179 | netevent.neigh = neigh; |
8d71740c TT |
2180 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
2181 | ||
38308473 | 2182 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 2183 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 2184 | ip6_del_rt(rt); |
1da177e4 LT |
2185 | } |
2186 | ||
2187 | out: | |
e8599ff4 | 2188 | neigh_release(neigh); |
6e157b6a DM |
2189 | } |
2190 | ||
1da177e4 LT |
2191 | /* |
2192 | * Misc support functions | |
2193 | */ | |
2194 | ||
4b32b5ad MKL |
2195 | static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) |
2196 | { | |
2197 | BUG_ON(from->dst.from); | |
2198 | ||
2199 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
2200 | dst_hold(&from->dst); | |
2201 | rt->dst.from = &from->dst; | |
2202 | dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true); | |
2203 | } | |
2204 | ||
83a09abd MKL |
2205 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort) |
2206 | { | |
2207 | rt->dst.input = ort->dst.input; | |
2208 | rt->dst.output = ort->dst.output; | |
2209 | rt->rt6i_dst = ort->rt6i_dst; | |
2210 | rt->dst.error = ort->dst.error; | |
2211 | rt->rt6i_idev = ort->rt6i_idev; | |
2212 | if (rt->rt6i_idev) | |
2213 | in6_dev_hold(rt->rt6i_idev); | |
2214 | rt->dst.lastuse = jiffies; | |
2215 | rt->rt6i_gateway = ort->rt6i_gateway; | |
2216 | rt->rt6i_flags = ort->rt6i_flags; | |
2217 | rt6_set_from(rt, ort); | |
2218 | rt->rt6i_metric = ort->rt6i_metric; | |
1da177e4 | 2219 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd | 2220 | rt->rt6i_src = ort->rt6i_src; |
1da177e4 | 2221 | #endif |
83a09abd MKL |
2222 | rt->rt6i_prefsrc = ort->rt6i_prefsrc; |
2223 | rt->rt6i_table = ort->rt6i_table; | |
61adedf3 | 2224 | rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate); |
1da177e4 LT |
2225 | } |
2226 | ||
70ceb4f5 | 2227 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 2228 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
2229 | const struct in6_addr *prefix, int prefixlen, |
2230 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
2231 | { |
2232 | struct fib6_node *fn; | |
2233 | struct rt6_info *rt = NULL; | |
c71099ac TG |
2234 | struct fib6_table *table; |
2235 | ||
efa2cea0 | 2236 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 2237 | if (!table) |
c71099ac | 2238 | return NULL; |
70ceb4f5 | 2239 | |
5744dd9b | 2240 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2241 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0); |
70ceb4f5 YH |
2242 | if (!fn) |
2243 | goto out; | |
2244 | ||
d8d1f30b | 2245 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2246 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
2247 | continue; |
2248 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
2249 | continue; | |
2250 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
2251 | continue; | |
d8d1f30b | 2252 | dst_hold(&rt->dst); |
70ceb4f5 YH |
2253 | break; |
2254 | } | |
2255 | out: | |
5744dd9b | 2256 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
2257 | return rt; |
2258 | } | |
2259 | ||
efa2cea0 | 2260 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
2261 | const struct in6_addr *prefix, int prefixlen, |
2262 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 2263 | unsigned int pref) |
70ceb4f5 | 2264 | { |
86872cb5 TG |
2265 | struct fib6_config cfg = { |
2266 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 2267 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2268 | .fc_ifindex = ifindex, |
2269 | .fc_dst_len = prefixlen, | |
2270 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
2271 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 2272 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
2273 | .fc_nlinfo.nlh = NULL, |
2274 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
2275 | }; |
2276 | ||
4e3fd7a0 AD |
2277 | cfg.fc_dst = *prefix; |
2278 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 2279 | |
e317da96 YH |
2280 | /* We should treat it as a default route if prefix length is 0. */ |
2281 | if (!prefixlen) | |
86872cb5 | 2282 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 2283 | |
86872cb5 | 2284 | ip6_route_add(&cfg); |
70ceb4f5 | 2285 | |
efa2cea0 | 2286 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
2287 | } |
2288 | #endif | |
2289 | ||
b71d1d42 | 2290 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 2291 | { |
1da177e4 | 2292 | struct rt6_info *rt; |
c71099ac | 2293 | struct fib6_table *table; |
1da177e4 | 2294 | |
c346dca1 | 2295 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 2296 | if (!table) |
c71099ac | 2297 | return NULL; |
1da177e4 | 2298 | |
5744dd9b | 2299 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2300 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2301 | if (dev == rt->dst.dev && |
045927ff | 2302 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
2303 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
2304 | break; | |
2305 | } | |
2306 | if (rt) | |
d8d1f30b | 2307 | dst_hold(&rt->dst); |
5744dd9b | 2308 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2309 | return rt; |
2310 | } | |
2311 | ||
b71d1d42 | 2312 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
2313 | struct net_device *dev, |
2314 | unsigned int pref) | |
1da177e4 | 2315 | { |
86872cb5 TG |
2316 | struct fib6_config cfg = { |
2317 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 2318 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2319 | .fc_ifindex = dev->ifindex, |
2320 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
2321 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 2322 | .fc_nlinfo.portid = 0, |
5578689a | 2323 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 2324 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 2325 | }; |
1da177e4 | 2326 | |
4e3fd7a0 | 2327 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 2328 | |
86872cb5 | 2329 | ip6_route_add(&cfg); |
1da177e4 | 2330 | |
1da177e4 LT |
2331 | return rt6_get_dflt_router(gwaddr, dev); |
2332 | } | |
2333 | ||
7b4da532 | 2334 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
2335 | { |
2336 | struct rt6_info *rt; | |
c71099ac TG |
2337 | struct fib6_table *table; |
2338 | ||
2339 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 2340 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 2341 | if (!table) |
c71099ac | 2342 | return; |
1da177e4 LT |
2343 | |
2344 | restart: | |
c71099ac | 2345 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 2346 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
3e8b0ac3 LC |
2347 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
2348 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d8d1f30b | 2349 | dst_hold(&rt->dst); |
c71099ac | 2350 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 2351 | ip6_del_rt(rt); |
1da177e4 LT |
2352 | goto restart; |
2353 | } | |
2354 | } | |
c71099ac | 2355 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2356 | } |
2357 | ||
5578689a DL |
2358 | static void rtmsg_to_fib6_config(struct net *net, |
2359 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
2360 | struct fib6_config *cfg) |
2361 | { | |
2362 | memset(cfg, 0, sizeof(*cfg)); | |
2363 | ||
2364 | cfg->fc_table = RT6_TABLE_MAIN; | |
2365 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
2366 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
2367 | cfg->fc_expires = rtmsg->rtmsg_info; | |
2368 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
2369 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
2370 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
2371 | ||
5578689a | 2372 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 2373 | |
4e3fd7a0 AD |
2374 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2375 | cfg->fc_src = rtmsg->rtmsg_src; | |
2376 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2377 | } |
2378 | ||
5578689a | 2379 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2380 | { |
86872cb5 | 2381 | struct fib6_config cfg; |
1da177e4 LT |
2382 | struct in6_rtmsg rtmsg; |
2383 | int err; | |
2384 | ||
67ba4152 | 2385 | switch (cmd) { |
1da177e4 LT |
2386 | case SIOCADDRT: /* Add a route */ |
2387 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 2388 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2389 | return -EPERM; |
2390 | err = copy_from_user(&rtmsg, arg, | |
2391 | sizeof(struct in6_rtmsg)); | |
2392 | if (err) | |
2393 | return -EFAULT; | |
86872cb5 | 2394 | |
5578689a | 2395 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2396 | |
1da177e4 LT |
2397 | rtnl_lock(); |
2398 | switch (cmd) { | |
2399 | case SIOCADDRT: | |
86872cb5 | 2400 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2401 | break; |
2402 | case SIOCDELRT: | |
86872cb5 | 2403 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2404 | break; |
2405 | default: | |
2406 | err = -EINVAL; | |
2407 | } | |
2408 | rtnl_unlock(); | |
2409 | ||
2410 | return err; | |
3ff50b79 | 2411 | } |
1da177e4 LT |
2412 | |
2413 | return -EINVAL; | |
2414 | } | |
2415 | ||
2416 | /* | |
2417 | * Drop the packet on the floor | |
2418 | */ | |
2419 | ||
d5fdd6ba | 2420 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2421 | { |
612f09e8 | 2422 | int type; |
adf30907 | 2423 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2424 | switch (ipstats_mib_noroutes) { |
2425 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2426 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2427 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2428 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2429 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2430 | break; |
2431 | } | |
2432 | /* FALLTHROUGH */ | |
2433 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2434 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2435 | ipstats_mib_noroutes); | |
612f09e8 YH |
2436 | break; |
2437 | } | |
3ffe533c | 2438 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2439 | kfree_skb(skb); |
2440 | return 0; | |
2441 | } | |
2442 | ||
9ce8ade0 TG |
2443 | static int ip6_pkt_discard(struct sk_buff *skb) |
2444 | { | |
612f09e8 | 2445 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2446 | } |
2447 | ||
ede2059d | 2448 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 2449 | { |
adf30907 | 2450 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2451 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2452 | } |
2453 | ||
9ce8ade0 TG |
2454 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2455 | { | |
612f09e8 | 2456 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2457 | } |
2458 | ||
ede2059d | 2459 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 2460 | { |
adf30907 | 2461 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2462 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2463 | } |
2464 | ||
1da177e4 LT |
2465 | /* |
2466 | * Allocate a dst for local (unicast / anycast) address. | |
2467 | */ | |
2468 | ||
2469 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2470 | const struct in6_addr *addr, | |
8f031519 | 2471 | bool anycast) |
1da177e4 | 2472 | { |
c346dca1 | 2473 | struct net *net = dev_net(idev->dev); |
a3300ef4 | 2474 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, |
ad706862 | 2475 | DST_NOCOUNT); |
a3300ef4 | 2476 | if (!rt) |
1da177e4 LT |
2477 | return ERR_PTR(-ENOMEM); |
2478 | ||
1da177e4 LT |
2479 | in6_dev_hold(idev); |
2480 | ||
11d53b49 | 2481 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2482 | rt->dst.input = ip6_input; |
2483 | rt->dst.output = ip6_output; | |
1da177e4 | 2484 | rt->rt6i_idev = idev; |
1da177e4 LT |
2485 | |
2486 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2487 | if (anycast) |
2488 | rt->rt6i_flags |= RTF_ANYCAST; | |
2489 | else | |
1da177e4 | 2490 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2491 | |
550bab42 | 2492 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 2493 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2494 | rt->rt6i_dst.plen = 128; |
5578689a | 2495 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
8e3d5be7 | 2496 | rt->dst.flags |= DST_NOCACHE; |
1da177e4 | 2497 | |
d8d1f30b | 2498 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2499 | |
2500 | return rt; | |
2501 | } | |
2502 | ||
c3968a85 DW |
2503 | int ip6_route_get_saddr(struct net *net, |
2504 | struct rt6_info *rt, | |
b71d1d42 | 2505 | const struct in6_addr *daddr, |
c3968a85 DW |
2506 | unsigned int prefs, |
2507 | struct in6_addr *saddr) | |
2508 | { | |
e16e888b MS |
2509 | struct inet6_dev *idev = |
2510 | rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL; | |
c3968a85 | 2511 | int err = 0; |
e16e888b | 2512 | if (rt && rt->rt6i_prefsrc.plen) |
4e3fd7a0 | 2513 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2514 | else |
2515 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2516 | daddr, prefs, saddr); | |
2517 | return err; | |
2518 | } | |
2519 | ||
2520 | /* remove deleted ip from prefsrc entries */ | |
2521 | struct arg_dev_net_ip { | |
2522 | struct net_device *dev; | |
2523 | struct net *net; | |
2524 | struct in6_addr *addr; | |
2525 | }; | |
2526 | ||
2527 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2528 | { | |
2529 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2530 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2531 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2532 | ||
d1918542 | 2533 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2534 | rt != net->ipv6.ip6_null_entry && |
2535 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2536 | /* remove prefsrc entry */ | |
2537 | rt->rt6i_prefsrc.plen = 0; | |
2538 | } | |
2539 | return 0; | |
2540 | } | |
2541 | ||
2542 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2543 | { | |
2544 | struct net *net = dev_net(ifp->idev->dev); | |
2545 | struct arg_dev_net_ip adni = { | |
2546 | .dev = ifp->idev->dev, | |
2547 | .net = net, | |
2548 | .addr = &ifp->addr, | |
2549 | }; | |
0c3584d5 | 2550 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
2551 | } |
2552 | ||
be7a010d DJ |
2553 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) |
2554 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) | |
2555 | ||
2556 | /* Remove routers and update dst entries when gateway turn into host. */ | |
2557 | static int fib6_clean_tohost(struct rt6_info *rt, void *arg) | |
2558 | { | |
2559 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
2560 | ||
2561 | if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) || | |
2562 | ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) && | |
2563 | ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { | |
2564 | return -1; | |
2565 | } | |
2566 | return 0; | |
2567 | } | |
2568 | ||
2569 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
2570 | { | |
2571 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
2572 | } | |
2573 | ||
8ed67789 DL |
2574 | struct arg_dev_net { |
2575 | struct net_device *dev; | |
2576 | struct net *net; | |
2577 | }; | |
2578 | ||
1da177e4 LT |
2579 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2580 | { | |
bc3ef660 | 2581 | const struct arg_dev_net *adn = arg; |
2582 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2583 | |
d1918542 | 2584 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2585 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2586 | return -1; |
c159d30c | 2587 | |
1da177e4 LT |
2588 | return 0; |
2589 | } | |
2590 | ||
f3db4851 | 2591 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2592 | { |
8ed67789 DL |
2593 | struct arg_dev_net adn = { |
2594 | .dev = dev, | |
2595 | .net = net, | |
2596 | }; | |
2597 | ||
0c3584d5 | 2598 | fib6_clean_all(net, fib6_ifdown, &adn); |
1e493d19 | 2599 | icmp6_clean_all(fib6_ifdown, &adn); |
8d0b94af | 2600 | rt6_uncached_list_flush_dev(net, dev); |
1da177e4 LT |
2601 | } |
2602 | ||
95c96174 | 2603 | struct rt6_mtu_change_arg { |
1da177e4 | 2604 | struct net_device *dev; |
95c96174 | 2605 | unsigned int mtu; |
1da177e4 LT |
2606 | }; |
2607 | ||
2608 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2609 | { | |
2610 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2611 | struct inet6_dev *idev; | |
2612 | ||
2613 | /* In IPv6 pmtu discovery is not optional, | |
2614 | so that RTAX_MTU lock cannot disable it. | |
2615 | We still use this lock to block changes | |
2616 | caused by addrconf/ndisc. | |
2617 | */ | |
2618 | ||
2619 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2620 | if (!idev) |
1da177e4 LT |
2621 | return 0; |
2622 | ||
2623 | /* For administrative MTU increase, there is no way to discover | |
2624 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2625 | Since RFC 1981 doesn't include administrative MTU increase | |
2626 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2627 | */ | |
2628 | /* | |
2629 | If new MTU is less than route PMTU, this new MTU will be the | |
2630 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2631 | decreases; if new MTU is greater than route PMTU, and the | |
2632 | old MTU is the lowest MTU in the path, update the route PMTU | |
2633 | to reflect the increase. In this case if the other nodes' MTU | |
2634 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2635 | PMTU discouvery. | |
2636 | */ | |
d1918542 | 2637 | if (rt->dst.dev == arg->dev && |
4b32b5ad MKL |
2638 | !dst_metric_locked(&rt->dst, RTAX_MTU)) { |
2639 | if (rt->rt6i_flags & RTF_CACHE) { | |
2640 | /* For RTF_CACHE with rt6i_pmtu == 0 | |
2641 | * (i.e. a redirected route), | |
2642 | * the metrics of its rt->dst.from has already | |
2643 | * been updated. | |
2644 | */ | |
2645 | if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu) | |
2646 | rt->rt6i_pmtu = arg->mtu; | |
2647 | } else if (dst_mtu(&rt->dst) >= arg->mtu || | |
2648 | (dst_mtu(&rt->dst) < arg->mtu && | |
2649 | dst_mtu(&rt->dst) == idev->cnf.mtu6)) { | |
2650 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); | |
2651 | } | |
566cfd8f | 2652 | } |
1da177e4 LT |
2653 | return 0; |
2654 | } | |
2655 | ||
95c96174 | 2656 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2657 | { |
c71099ac TG |
2658 | struct rt6_mtu_change_arg arg = { |
2659 | .dev = dev, | |
2660 | .mtu = mtu, | |
2661 | }; | |
1da177e4 | 2662 | |
0c3584d5 | 2663 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
2664 | } |
2665 | ||
ef7c79ed | 2666 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2667 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2668 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2669 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2670 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2671 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2672 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 2673 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
2674 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
2675 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
86872cb5 TG |
2676 | }; |
2677 | ||
2678 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2679 | struct fib6_config *cfg) | |
1da177e4 | 2680 | { |
86872cb5 TG |
2681 | struct rtmsg *rtm; |
2682 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 2683 | unsigned int pref; |
86872cb5 | 2684 | int err; |
1da177e4 | 2685 | |
86872cb5 TG |
2686 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2687 | if (err < 0) | |
2688 | goto errout; | |
1da177e4 | 2689 | |
86872cb5 TG |
2690 | err = -EINVAL; |
2691 | rtm = nlmsg_data(nlh); | |
2692 | memset(cfg, 0, sizeof(*cfg)); | |
2693 | ||
2694 | cfg->fc_table = rtm->rtm_table; | |
2695 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2696 | cfg->fc_src_len = rtm->rtm_src_len; | |
2697 | cfg->fc_flags = RTF_UP; | |
2698 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2699 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2700 | |
ef2c7d7b ND |
2701 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2702 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2703 | rtm->rtm_type == RTN_PROHIBIT || |
2704 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2705 | cfg->fc_flags |= RTF_REJECT; |
2706 | ||
ab79ad14 MŻ |
2707 | if (rtm->rtm_type == RTN_LOCAL) |
2708 | cfg->fc_flags |= RTF_LOCAL; | |
2709 | ||
1f56a01f MKL |
2710 | if (rtm->rtm_flags & RTM_F_CLONED) |
2711 | cfg->fc_flags |= RTF_CACHE; | |
2712 | ||
15e47304 | 2713 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2714 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2715 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2716 | |
2717 | if (tb[RTA_GATEWAY]) { | |
67b61f6c | 2718 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 2719 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 2720 | } |
86872cb5 TG |
2721 | |
2722 | if (tb[RTA_DST]) { | |
2723 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2724 | ||
2725 | if (nla_len(tb[RTA_DST]) < plen) | |
2726 | goto errout; | |
2727 | ||
2728 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2729 | } |
86872cb5 TG |
2730 | |
2731 | if (tb[RTA_SRC]) { | |
2732 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2733 | ||
2734 | if (nla_len(tb[RTA_SRC]) < plen) | |
2735 | goto errout; | |
2736 | ||
2737 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2738 | } |
86872cb5 | 2739 | |
c3968a85 | 2740 | if (tb[RTA_PREFSRC]) |
67b61f6c | 2741 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 2742 | |
86872cb5 TG |
2743 | if (tb[RTA_OIF]) |
2744 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2745 | ||
2746 | if (tb[RTA_PRIORITY]) | |
2747 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2748 | ||
2749 | if (tb[RTA_METRICS]) { | |
2750 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2751 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2752 | } |
86872cb5 TG |
2753 | |
2754 | if (tb[RTA_TABLE]) | |
2755 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2756 | ||
51ebd318 ND |
2757 | if (tb[RTA_MULTIPATH]) { |
2758 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2759 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
2760 | } | |
2761 | ||
c78ba6d6 LR |
2762 | if (tb[RTA_PREF]) { |
2763 | pref = nla_get_u8(tb[RTA_PREF]); | |
2764 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
2765 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
2766 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
2767 | cfg->fc_flags |= RTF_PREF(pref); | |
2768 | } | |
2769 | ||
19e42e45 RP |
2770 | if (tb[RTA_ENCAP]) |
2771 | cfg->fc_encap = tb[RTA_ENCAP]; | |
2772 | ||
2773 | if (tb[RTA_ENCAP_TYPE]) | |
2774 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); | |
2775 | ||
86872cb5 TG |
2776 | err = 0; |
2777 | errout: | |
2778 | return err; | |
1da177e4 LT |
2779 | } |
2780 | ||
6b9ea5a6 RP |
2781 | struct rt6_nh { |
2782 | struct rt6_info *rt6_info; | |
2783 | struct fib6_config r_cfg; | |
2784 | struct mx6_config mxc; | |
2785 | struct list_head next; | |
2786 | }; | |
2787 | ||
2788 | static void ip6_print_replace_route_err(struct list_head *rt6_nh_list) | |
2789 | { | |
2790 | struct rt6_nh *nh; | |
2791 | ||
2792 | list_for_each_entry(nh, rt6_nh_list, next) { | |
2793 | pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n", | |
2794 | &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway, | |
2795 | nh->r_cfg.fc_ifindex); | |
2796 | } | |
2797 | } | |
2798 | ||
2799 | static int ip6_route_info_append(struct list_head *rt6_nh_list, | |
2800 | struct rt6_info *rt, struct fib6_config *r_cfg) | |
2801 | { | |
2802 | struct rt6_nh *nh; | |
2803 | struct rt6_info *rtnh; | |
2804 | int err = -EEXIST; | |
2805 | ||
2806 | list_for_each_entry(nh, rt6_nh_list, next) { | |
2807 | /* check if rt6_info already exists */ | |
2808 | rtnh = nh->rt6_info; | |
2809 | ||
2810 | if (rtnh->dst.dev == rt->dst.dev && | |
2811 | rtnh->rt6i_idev == rt->rt6i_idev && | |
2812 | ipv6_addr_equal(&rtnh->rt6i_gateway, | |
2813 | &rt->rt6i_gateway)) | |
2814 | return err; | |
2815 | } | |
2816 | ||
2817 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
2818 | if (!nh) | |
2819 | return -ENOMEM; | |
2820 | nh->rt6_info = rt; | |
2821 | err = ip6_convert_metrics(&nh->mxc, r_cfg); | |
2822 | if (err) { | |
2823 | kfree(nh); | |
2824 | return err; | |
2825 | } | |
2826 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); | |
2827 | list_add_tail(&nh->next, rt6_nh_list); | |
2828 | ||
2829 | return 0; | |
2830 | } | |
2831 | ||
2832 | static int ip6_route_multipath_add(struct fib6_config *cfg) | |
51ebd318 ND |
2833 | { |
2834 | struct fib6_config r_cfg; | |
2835 | struct rtnexthop *rtnh; | |
6b9ea5a6 RP |
2836 | struct rt6_info *rt; |
2837 | struct rt6_nh *err_nh; | |
2838 | struct rt6_nh *nh, *nh_safe; | |
51ebd318 ND |
2839 | int remaining; |
2840 | int attrlen; | |
6b9ea5a6 RP |
2841 | int err = 1; |
2842 | int nhn = 0; | |
2843 | int replace = (cfg->fc_nlinfo.nlh && | |
2844 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
2845 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 2846 | |
35f1b4e9 | 2847 | remaining = cfg->fc_mp_len; |
51ebd318 | 2848 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 2849 | |
6b9ea5a6 RP |
2850 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
2851 | * rt6_info structs per nexthop | |
2852 | */ | |
51ebd318 ND |
2853 | while (rtnh_ok(rtnh, remaining)) { |
2854 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2855 | if (rtnh->rtnh_ifindex) | |
2856 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2857 | ||
2858 | attrlen = rtnh_attrlen(rtnh); | |
2859 | if (attrlen > 0) { | |
2860 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2861 | ||
2862 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2863 | if (nla) { | |
67b61f6c | 2864 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
2865 | r_cfg.fc_flags |= RTF_GATEWAY; |
2866 | } | |
19e42e45 RP |
2867 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
2868 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
2869 | if (nla) | |
2870 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 2871 | } |
6b9ea5a6 | 2872 | |
8c5b83f0 RP |
2873 | rt = ip6_route_info_create(&r_cfg); |
2874 | if (IS_ERR(rt)) { | |
2875 | err = PTR_ERR(rt); | |
2876 | rt = NULL; | |
6b9ea5a6 | 2877 | goto cleanup; |
8c5b83f0 | 2878 | } |
6b9ea5a6 RP |
2879 | |
2880 | err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg); | |
51ebd318 | 2881 | if (err) { |
6b9ea5a6 RP |
2882 | dst_free(&rt->dst); |
2883 | goto cleanup; | |
2884 | } | |
2885 | ||
2886 | rtnh = rtnh_next(rtnh, &remaining); | |
2887 | } | |
2888 | ||
2889 | err_nh = NULL; | |
2890 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
2891 | err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc); | |
2892 | /* nh->rt6_info is used or freed at this point, reset to NULL*/ | |
2893 | nh->rt6_info = NULL; | |
2894 | if (err) { | |
2895 | if (replace && nhn) | |
2896 | ip6_print_replace_route_err(&rt6_nh_list); | |
2897 | err_nh = nh; | |
2898 | goto add_errout; | |
51ebd318 | 2899 | } |
6b9ea5a6 | 2900 | |
1a72418b | 2901 | /* Because each route is added like a single route we remove |
27596472 MK |
2902 | * these flags after the first nexthop: if there is a collision, |
2903 | * we have already failed to add the first nexthop: | |
2904 | * fib6_add_rt2node() has rejected it; when replacing, old | |
2905 | * nexthops have been replaced by first new, the rest should | |
2906 | * be added to it. | |
1a72418b | 2907 | */ |
27596472 MK |
2908 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
2909 | NLM_F_REPLACE); | |
6b9ea5a6 RP |
2910 | nhn++; |
2911 | } | |
2912 | ||
2913 | goto cleanup; | |
2914 | ||
2915 | add_errout: | |
2916 | /* Delete routes that were already added */ | |
2917 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
2918 | if (err_nh == nh) | |
2919 | break; | |
2920 | ip6_route_del(&nh->r_cfg); | |
2921 | } | |
2922 | ||
2923 | cleanup: | |
2924 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
2925 | if (nh->rt6_info) | |
2926 | dst_free(&nh->rt6_info->dst); | |
52fe51f8 | 2927 | kfree(nh->mxc.mx); |
6b9ea5a6 RP |
2928 | list_del(&nh->next); |
2929 | kfree(nh); | |
2930 | } | |
2931 | ||
2932 | return err; | |
2933 | } | |
2934 | ||
2935 | static int ip6_route_multipath_del(struct fib6_config *cfg) | |
2936 | { | |
2937 | struct fib6_config r_cfg; | |
2938 | struct rtnexthop *rtnh; | |
2939 | int remaining; | |
2940 | int attrlen; | |
2941 | int err = 1, last_err = 0; | |
2942 | ||
2943 | remaining = cfg->fc_mp_len; | |
2944 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
2945 | ||
2946 | /* Parse a Multipath Entry */ | |
2947 | while (rtnh_ok(rtnh, remaining)) { | |
2948 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2949 | if (rtnh->rtnh_ifindex) | |
2950 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2951 | ||
2952 | attrlen = rtnh_attrlen(rtnh); | |
2953 | if (attrlen > 0) { | |
2954 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2955 | ||
2956 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2957 | if (nla) { | |
2958 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
2959 | r_cfg.fc_flags |= RTF_GATEWAY; | |
2960 | } | |
2961 | } | |
2962 | err = ip6_route_del(&r_cfg); | |
2963 | if (err) | |
2964 | last_err = err; | |
2965 | ||
51ebd318 ND |
2966 | rtnh = rtnh_next(rtnh, &remaining); |
2967 | } | |
2968 | ||
2969 | return last_err; | |
2970 | } | |
2971 | ||
67ba4152 | 2972 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 2973 | { |
86872cb5 TG |
2974 | struct fib6_config cfg; |
2975 | int err; | |
1da177e4 | 2976 | |
86872cb5 TG |
2977 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2978 | if (err < 0) | |
2979 | return err; | |
2980 | ||
51ebd318 | 2981 | if (cfg.fc_mp) |
6b9ea5a6 | 2982 | return ip6_route_multipath_del(&cfg); |
51ebd318 ND |
2983 | else |
2984 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2985 | } |
2986 | ||
67ba4152 | 2987 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 2988 | { |
86872cb5 TG |
2989 | struct fib6_config cfg; |
2990 | int err; | |
1da177e4 | 2991 | |
86872cb5 TG |
2992 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2993 | if (err < 0) | |
2994 | return err; | |
2995 | ||
51ebd318 | 2996 | if (cfg.fc_mp) |
6b9ea5a6 | 2997 | return ip6_route_multipath_add(&cfg); |
51ebd318 ND |
2998 | else |
2999 | return ip6_route_add(&cfg); | |
1da177e4 LT |
3000 | } |
3001 | ||
19e42e45 | 3002 | static inline size_t rt6_nlmsg_size(struct rt6_info *rt) |
339bf98f TG |
3003 | { |
3004 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
3005 | + nla_total_size(16) /* RTA_SRC */ | |
3006 | + nla_total_size(16) /* RTA_DST */ | |
3007 | + nla_total_size(16) /* RTA_GATEWAY */ | |
3008 | + nla_total_size(16) /* RTA_PREFSRC */ | |
3009 | + nla_total_size(4) /* RTA_TABLE */ | |
3010 | + nla_total_size(4) /* RTA_IIF */ | |
3011 | + nla_total_size(4) /* RTA_OIF */ | |
3012 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 3013 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 3014 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 3015 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 3016 | + nla_total_size(1) /* RTA_PREF */ |
61adedf3 | 3017 | + lwtunnel_get_encap_size(rt->dst.lwtstate); |
339bf98f TG |
3018 | } |
3019 | ||
191cd582 BH |
3020 | static int rt6_fill_node(struct net *net, |
3021 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 3022 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 3023 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 3024 | int prefix, int nowait, unsigned int flags) |
1da177e4 | 3025 | { |
4b32b5ad | 3026 | u32 metrics[RTAX_MAX]; |
1da177e4 | 3027 | struct rtmsg *rtm; |
2d7202bf | 3028 | struct nlmsghdr *nlh; |
e3703b3d | 3029 | long expires; |
9e762a4a | 3030 | u32 table; |
1da177e4 LT |
3031 | |
3032 | if (prefix) { /* user wants prefix routes only */ | |
3033 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
3034 | /* success since this is not a prefix route */ | |
3035 | return 1; | |
3036 | } | |
3037 | } | |
3038 | ||
15e47304 | 3039 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 3040 | if (!nlh) |
26932566 | 3041 | return -EMSGSIZE; |
2d7202bf TG |
3042 | |
3043 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
3044 | rtm->rtm_family = AF_INET6; |
3045 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
3046 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
3047 | rtm->rtm_tos = 0; | |
c71099ac | 3048 | if (rt->rt6i_table) |
9e762a4a | 3049 | table = rt->rt6i_table->tb6_id; |
c71099ac | 3050 | else |
9e762a4a PM |
3051 | table = RT6_TABLE_UNSPEC; |
3052 | rtm->rtm_table = table; | |
c78679e8 DM |
3053 | if (nla_put_u32(skb, RTA_TABLE, table)) |
3054 | goto nla_put_failure; | |
ef2c7d7b ND |
3055 | if (rt->rt6i_flags & RTF_REJECT) { |
3056 | switch (rt->dst.error) { | |
3057 | case -EINVAL: | |
3058 | rtm->rtm_type = RTN_BLACKHOLE; | |
3059 | break; | |
3060 | case -EACCES: | |
3061 | rtm->rtm_type = RTN_PROHIBIT; | |
3062 | break; | |
b4949ab2 ND |
3063 | case -EAGAIN: |
3064 | rtm->rtm_type = RTN_THROW; | |
3065 | break; | |
ef2c7d7b ND |
3066 | default: |
3067 | rtm->rtm_type = RTN_UNREACHABLE; | |
3068 | break; | |
3069 | } | |
3070 | } | |
38308473 | 3071 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 3072 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 3073 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
3074 | rtm->rtm_type = RTN_LOCAL; |
3075 | else | |
3076 | rtm->rtm_type = RTN_UNICAST; | |
3077 | rtm->rtm_flags = 0; | |
35103d11 | 3078 | if (!netif_carrier_ok(rt->dst.dev)) { |
cea45e20 | 3079 | rtm->rtm_flags |= RTNH_F_LINKDOWN; |
35103d11 AG |
3080 | if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown) |
3081 | rtm->rtm_flags |= RTNH_F_DEAD; | |
3082 | } | |
1da177e4 LT |
3083 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
3084 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 3085 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 3086 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
3087 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
3088 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
3089 | rtm->rtm_protocol = RTPROT_RA; | |
3090 | else | |
3091 | rtm->rtm_protocol = RTPROT_KERNEL; | |
3092 | } | |
1da177e4 | 3093 | |
38308473 | 3094 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
3095 | rtm->rtm_flags |= RTM_F_CLONED; |
3096 | ||
3097 | if (dst) { | |
930345ea | 3098 | if (nla_put_in6_addr(skb, RTA_DST, dst)) |
c78679e8 | 3099 | goto nla_put_failure; |
1ab1457c | 3100 | rtm->rtm_dst_len = 128; |
1da177e4 | 3101 | } else if (rtm->rtm_dst_len) |
930345ea | 3102 | if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr)) |
c78679e8 | 3103 | goto nla_put_failure; |
1da177e4 LT |
3104 | #ifdef CONFIG_IPV6_SUBTREES |
3105 | if (src) { | |
930345ea | 3106 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 3107 | goto nla_put_failure; |
1ab1457c | 3108 | rtm->rtm_src_len = 128; |
c78679e8 | 3109 | } else if (rtm->rtm_src_len && |
930345ea | 3110 | nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr)) |
c78679e8 | 3111 | goto nla_put_failure; |
1da177e4 | 3112 | #endif |
7bc570c8 YH |
3113 | if (iif) { |
3114 | #ifdef CONFIG_IPV6_MROUTE | |
3115 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 3116 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
3117 | if (err <= 0) { |
3118 | if (!nowait) { | |
3119 | if (err == 0) | |
3120 | return 0; | |
3121 | goto nla_put_failure; | |
3122 | } else { | |
3123 | if (err == -EMSGSIZE) | |
3124 | goto nla_put_failure; | |
3125 | } | |
3126 | } | |
3127 | } else | |
3128 | #endif | |
c78679e8 DM |
3129 | if (nla_put_u32(skb, RTA_IIF, iif)) |
3130 | goto nla_put_failure; | |
7bc570c8 | 3131 | } else if (dst) { |
1da177e4 | 3132 | struct in6_addr saddr_buf; |
c78679e8 | 3133 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
930345ea | 3134 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3135 | goto nla_put_failure; |
1da177e4 | 3136 | } |
2d7202bf | 3137 | |
c3968a85 DW |
3138 | if (rt->rt6i_prefsrc.plen) { |
3139 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 3140 | saddr_buf = rt->rt6i_prefsrc.addr; |
930345ea | 3141 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3142 | goto nla_put_failure; |
c3968a85 DW |
3143 | } |
3144 | ||
4b32b5ad MKL |
3145 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
3146 | if (rt->rt6i_pmtu) | |
3147 | metrics[RTAX_MTU - 1] = rt->rt6i_pmtu; | |
3148 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
2d7202bf TG |
3149 | goto nla_put_failure; |
3150 | ||
dd0cbf29 | 3151 | if (rt->rt6i_flags & RTF_GATEWAY) { |
930345ea | 3152 | if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0) |
94f826b8 | 3153 | goto nla_put_failure; |
94f826b8 | 3154 | } |
2d7202bf | 3155 | |
c78679e8 DM |
3156 | if (rt->dst.dev && |
3157 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
3158 | goto nla_put_failure; | |
3159 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
3160 | goto nla_put_failure; | |
8253947e LW |
3161 | |
3162 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 3163 | |
87a50699 | 3164 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 3165 | goto nla_put_failure; |
2d7202bf | 3166 | |
c78ba6d6 LR |
3167 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags))) |
3168 | goto nla_put_failure; | |
3169 | ||
61adedf3 | 3170 | lwtunnel_fill_encap(skb, rt->dst.lwtstate); |
19e42e45 | 3171 | |
053c095a JB |
3172 | nlmsg_end(skb, nlh); |
3173 | return 0; | |
2d7202bf TG |
3174 | |
3175 | nla_put_failure: | |
26932566 PM |
3176 | nlmsg_cancel(skb, nlh); |
3177 | return -EMSGSIZE; | |
1da177e4 LT |
3178 | } |
3179 | ||
1b43af54 | 3180 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
3181 | { |
3182 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
3183 | int prefix; | |
3184 | ||
2d7202bf TG |
3185 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
3186 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
3187 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
3188 | } else | |
3189 | prefix = 0; | |
3190 | ||
191cd582 BH |
3191 | return rt6_fill_node(arg->net, |
3192 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 3193 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 3194 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
3195 | } |
3196 | ||
67ba4152 | 3197 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) |
1da177e4 | 3198 | { |
3b1e0a65 | 3199 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
3200 | struct nlattr *tb[RTA_MAX+1]; |
3201 | struct rt6_info *rt; | |
1da177e4 | 3202 | struct sk_buff *skb; |
ab364a6f | 3203 | struct rtmsg *rtm; |
4c9483b2 | 3204 | struct flowi6 fl6; |
72331bc0 | 3205 | int err, iif = 0, oif = 0; |
1da177e4 | 3206 | |
ab364a6f TG |
3207 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
3208 | if (err < 0) | |
3209 | goto errout; | |
1da177e4 | 3210 | |
ab364a6f | 3211 | err = -EINVAL; |
4c9483b2 | 3212 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 3213 | |
ab364a6f TG |
3214 | if (tb[RTA_SRC]) { |
3215 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
3216 | goto errout; | |
3217 | ||
4e3fd7a0 | 3218 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
3219 | } |
3220 | ||
3221 | if (tb[RTA_DST]) { | |
3222 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
3223 | goto errout; | |
3224 | ||
4e3fd7a0 | 3225 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
3226 | } |
3227 | ||
3228 | if (tb[RTA_IIF]) | |
3229 | iif = nla_get_u32(tb[RTA_IIF]); | |
3230 | ||
3231 | if (tb[RTA_OIF]) | |
72331bc0 | 3232 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 3233 | |
2e47b291 LC |
3234 | if (tb[RTA_MARK]) |
3235 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
3236 | ||
1da177e4 LT |
3237 | if (iif) { |
3238 | struct net_device *dev; | |
72331bc0 SL |
3239 | int flags = 0; |
3240 | ||
5578689a | 3241 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
3242 | if (!dev) { |
3243 | err = -ENODEV; | |
ab364a6f | 3244 | goto errout; |
1da177e4 | 3245 | } |
72331bc0 SL |
3246 | |
3247 | fl6.flowi6_iif = iif; | |
3248 | ||
3249 | if (!ipv6_addr_any(&fl6.saddr)) | |
3250 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3251 | ||
3252 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
3253 | flags); | |
3254 | } else { | |
3255 | fl6.flowi6_oif = oif; | |
3256 | ||
3257 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
3258 | } |
3259 | ||
ab364a6f | 3260 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 3261 | if (!skb) { |
94e187c0 | 3262 | ip6_rt_put(rt); |
ab364a6f TG |
3263 | err = -ENOBUFS; |
3264 | goto errout; | |
3265 | } | |
1da177e4 | 3266 | |
ab364a6f TG |
3267 | /* Reserve room for dummy headers, this skb can pass |
3268 | through good chunk of routing engine. | |
3269 | */ | |
459a98ed | 3270 | skb_reset_mac_header(skb); |
ab364a6f | 3271 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 3272 | |
d8d1f30b | 3273 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 3274 | |
4c9483b2 | 3275 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 3276 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 3277 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 3278 | if (err < 0) { |
ab364a6f TG |
3279 | kfree_skb(skb); |
3280 | goto errout; | |
1da177e4 LT |
3281 | } |
3282 | ||
15e47304 | 3283 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 3284 | errout: |
1da177e4 | 3285 | return err; |
1da177e4 LT |
3286 | } |
3287 | ||
37a1d361 RP |
3288 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info, |
3289 | unsigned int nlm_flags) | |
1da177e4 LT |
3290 | { |
3291 | struct sk_buff *skb; | |
5578689a | 3292 | struct net *net = info->nl_net; |
528c4ceb DL |
3293 | u32 seq; |
3294 | int err; | |
3295 | ||
3296 | err = -ENOBUFS; | |
38308473 | 3297 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 3298 | |
19e42e45 | 3299 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 3300 | if (!skb) |
21713ebc TG |
3301 | goto errout; |
3302 | ||
191cd582 | 3303 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
37a1d361 | 3304 | event, info->portid, seq, 0, 0, nlm_flags); |
26932566 PM |
3305 | if (err < 0) { |
3306 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
3307 | WARN_ON(err == -EMSGSIZE); | |
3308 | kfree_skb(skb); | |
3309 | goto errout; | |
3310 | } | |
15e47304 | 3311 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
3312 | info->nlh, gfp_any()); |
3313 | return; | |
21713ebc TG |
3314 | errout: |
3315 | if (err < 0) | |
5578689a | 3316 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
3317 | } |
3318 | ||
8ed67789 | 3319 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 3320 | unsigned long event, void *ptr) |
8ed67789 | 3321 | { |
351638e7 | 3322 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3323 | struct net *net = dev_net(dev); |
8ed67789 DL |
3324 | |
3325 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 3326 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
3327 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
3328 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3329 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 3330 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 3331 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
3332 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
3333 | #endif | |
3334 | } | |
3335 | ||
3336 | return NOTIFY_OK; | |
3337 | } | |
3338 | ||
1da177e4 LT |
3339 | /* |
3340 | * /proc | |
3341 | */ | |
3342 | ||
3343 | #ifdef CONFIG_PROC_FS | |
3344 | ||
33120b30 AD |
3345 | static const struct file_operations ipv6_route_proc_fops = { |
3346 | .owner = THIS_MODULE, | |
3347 | .open = ipv6_route_open, | |
3348 | .read = seq_read, | |
3349 | .llseek = seq_lseek, | |
8d2ca1d7 | 3350 | .release = seq_release_net, |
33120b30 AD |
3351 | }; |
3352 | ||
1da177e4 LT |
3353 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
3354 | { | |
69ddb805 | 3355 | struct net *net = (struct net *)seq->private; |
1da177e4 | 3356 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
3357 | net->ipv6.rt6_stats->fib_nodes, |
3358 | net->ipv6.rt6_stats->fib_route_nodes, | |
3359 | net->ipv6.rt6_stats->fib_rt_alloc, | |
3360 | net->ipv6.rt6_stats->fib_rt_entries, | |
3361 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 3362 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 3363 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
3364 | |
3365 | return 0; | |
3366 | } | |
3367 | ||
3368 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
3369 | { | |
de05c557 | 3370 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
3371 | } |
3372 | ||
9a32144e | 3373 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
3374 | .owner = THIS_MODULE, |
3375 | .open = rt6_stats_seq_open, | |
3376 | .read = seq_read, | |
3377 | .llseek = seq_lseek, | |
b6fcbdb4 | 3378 | .release = single_release_net, |
1da177e4 LT |
3379 | }; |
3380 | #endif /* CONFIG_PROC_FS */ | |
3381 | ||
3382 | #ifdef CONFIG_SYSCTL | |
3383 | ||
1da177e4 | 3384 | static |
fe2c6338 | 3385 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
3386 | void __user *buffer, size_t *lenp, loff_t *ppos) |
3387 | { | |
c486da34 LAG |
3388 | struct net *net; |
3389 | int delay; | |
3390 | if (!write) | |
1da177e4 | 3391 | return -EINVAL; |
c486da34 LAG |
3392 | |
3393 | net = (struct net *)ctl->extra1; | |
3394 | delay = net->ipv6.sysctl.flush_delay; | |
3395 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 3396 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 3397 | return 0; |
1da177e4 LT |
3398 | } |
3399 | ||
fe2c6338 | 3400 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 3401 | { |
1da177e4 | 3402 | .procname = "flush", |
4990509f | 3403 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 3404 | .maxlen = sizeof(int), |
89c8b3a1 | 3405 | .mode = 0200, |
6d9f239a | 3406 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
3407 | }, |
3408 | { | |
1da177e4 | 3409 | .procname = "gc_thresh", |
9a7ec3a9 | 3410 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
3411 | .maxlen = sizeof(int), |
3412 | .mode = 0644, | |
6d9f239a | 3413 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3414 | }, |
3415 | { | |
1da177e4 | 3416 | .procname = "max_size", |
4990509f | 3417 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
3418 | .maxlen = sizeof(int), |
3419 | .mode = 0644, | |
6d9f239a | 3420 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3421 | }, |
3422 | { | |
1da177e4 | 3423 | .procname = "gc_min_interval", |
4990509f | 3424 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3425 | .maxlen = sizeof(int), |
3426 | .mode = 0644, | |
6d9f239a | 3427 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3428 | }, |
3429 | { | |
1da177e4 | 3430 | .procname = "gc_timeout", |
4990509f | 3431 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
3432 | .maxlen = sizeof(int), |
3433 | .mode = 0644, | |
6d9f239a | 3434 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3435 | }, |
3436 | { | |
1da177e4 | 3437 | .procname = "gc_interval", |
4990509f | 3438 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
3439 | .maxlen = sizeof(int), |
3440 | .mode = 0644, | |
6d9f239a | 3441 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3442 | }, |
3443 | { | |
1da177e4 | 3444 | .procname = "gc_elasticity", |
4990509f | 3445 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
3446 | .maxlen = sizeof(int), |
3447 | .mode = 0644, | |
f3d3f616 | 3448 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3449 | }, |
3450 | { | |
1da177e4 | 3451 | .procname = "mtu_expires", |
4990509f | 3452 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
3453 | .maxlen = sizeof(int), |
3454 | .mode = 0644, | |
6d9f239a | 3455 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3456 | }, |
3457 | { | |
1da177e4 | 3458 | .procname = "min_adv_mss", |
4990509f | 3459 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
3460 | .maxlen = sizeof(int), |
3461 | .mode = 0644, | |
f3d3f616 | 3462 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3463 | }, |
3464 | { | |
1da177e4 | 3465 | .procname = "gc_min_interval_ms", |
4990509f | 3466 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3467 | .maxlen = sizeof(int), |
3468 | .mode = 0644, | |
6d9f239a | 3469 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 3470 | }, |
f8572d8f | 3471 | { } |
1da177e4 LT |
3472 | }; |
3473 | ||
2c8c1e72 | 3474 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
3475 | { |
3476 | struct ctl_table *table; | |
3477 | ||
3478 | table = kmemdup(ipv6_route_table_template, | |
3479 | sizeof(ipv6_route_table_template), | |
3480 | GFP_KERNEL); | |
5ee09105 YH |
3481 | |
3482 | if (table) { | |
3483 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 3484 | table[0].extra1 = net; |
86393e52 | 3485 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
3486 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
3487 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
3488 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3489 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
3490 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3491 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
3492 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 3493 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
3494 | |
3495 | /* Don't export sysctls to unprivileged users */ | |
3496 | if (net->user_ns != &init_user_ns) | |
3497 | table[0].procname = NULL; | |
5ee09105 YH |
3498 | } |
3499 | ||
760f2d01 DL |
3500 | return table; |
3501 | } | |
1da177e4 LT |
3502 | #endif |
3503 | ||
2c8c1e72 | 3504 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 3505 | { |
633d424b | 3506 | int ret = -ENOMEM; |
8ed67789 | 3507 | |
86393e52 AD |
3508 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
3509 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 3510 | |
fc66f95c ED |
3511 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
3512 | goto out_ip6_dst_ops; | |
3513 | ||
8ed67789 DL |
3514 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
3515 | sizeof(*net->ipv6.ip6_null_entry), | |
3516 | GFP_KERNEL); | |
3517 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 3518 | goto out_ip6_dst_entries; |
d8d1f30b | 3519 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 3520 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 3521 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3522 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
3523 | ip6_template_metrics, true); | |
8ed67789 DL |
3524 | |
3525 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3526 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
3527 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
3528 | GFP_KERNEL); | |
68fffc67 PZ |
3529 | if (!net->ipv6.ip6_prohibit_entry) |
3530 | goto out_ip6_null_entry; | |
d8d1f30b | 3531 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 3532 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 3533 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3534 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
3535 | ip6_template_metrics, true); | |
8ed67789 DL |
3536 | |
3537 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
3538 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
3539 | GFP_KERNEL); | |
68fffc67 PZ |
3540 | if (!net->ipv6.ip6_blk_hole_entry) |
3541 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 3542 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 3543 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 3544 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3545 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
3546 | ip6_template_metrics, true); | |
8ed67789 DL |
3547 | #endif |
3548 | ||
b339a47c PZ |
3549 | net->ipv6.sysctl.flush_delay = 0; |
3550 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3551 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3552 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3553 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3554 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
3555 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
3556 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
3557 | ||
6891a346 BT |
3558 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
3559 | ||
8ed67789 DL |
3560 | ret = 0; |
3561 | out: | |
3562 | return ret; | |
f2fc6a54 | 3563 | |
68fffc67 PZ |
3564 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
3565 | out_ip6_prohibit_entry: | |
3566 | kfree(net->ipv6.ip6_prohibit_entry); | |
3567 | out_ip6_null_entry: | |
3568 | kfree(net->ipv6.ip6_null_entry); | |
3569 | #endif | |
fc66f95c ED |
3570 | out_ip6_dst_entries: |
3571 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3572 | out_ip6_dst_ops: |
f2fc6a54 | 3573 | goto out; |
cdb18761 DL |
3574 | } |
3575 | ||
2c8c1e72 | 3576 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3577 | { |
8ed67789 DL |
3578 | kfree(net->ipv6.ip6_null_entry); |
3579 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3580 | kfree(net->ipv6.ip6_prohibit_entry); | |
3581 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3582 | #endif | |
41bb78b4 | 3583 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3584 | } |
3585 | ||
d189634e TG |
3586 | static int __net_init ip6_route_net_init_late(struct net *net) |
3587 | { | |
3588 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
3589 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
3590 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3591 | #endif |
3592 | return 0; | |
3593 | } | |
3594 | ||
3595 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3596 | { | |
3597 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3598 | remove_proc_entry("ipv6_route", net->proc_net); |
3599 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3600 | #endif |
3601 | } | |
3602 | ||
cdb18761 DL |
3603 | static struct pernet_operations ip6_route_net_ops = { |
3604 | .init = ip6_route_net_init, | |
3605 | .exit = ip6_route_net_exit, | |
3606 | }; | |
3607 | ||
c3426b47 DM |
3608 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3609 | { | |
3610 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3611 | ||
3612 | if (!bp) | |
3613 | return -ENOMEM; | |
3614 | inet_peer_base_init(bp); | |
3615 | net->ipv6.peers = bp; | |
3616 | return 0; | |
3617 | } | |
3618 | ||
3619 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3620 | { | |
3621 | struct inet_peer_base *bp = net->ipv6.peers; | |
3622 | ||
3623 | net->ipv6.peers = NULL; | |
56a6b248 | 3624 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3625 | kfree(bp); |
3626 | } | |
3627 | ||
2b823f72 | 3628 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3629 | .init = ipv6_inetpeer_init, |
3630 | .exit = ipv6_inetpeer_exit, | |
3631 | }; | |
3632 | ||
d189634e TG |
3633 | static struct pernet_operations ip6_route_net_late_ops = { |
3634 | .init = ip6_route_net_init_late, | |
3635 | .exit = ip6_route_net_exit_late, | |
3636 | }; | |
3637 | ||
8ed67789 DL |
3638 | static struct notifier_block ip6_route_dev_notifier = { |
3639 | .notifier_call = ip6_route_dev_notify, | |
3640 | .priority = 0, | |
3641 | }; | |
3642 | ||
433d49c3 | 3643 | int __init ip6_route_init(void) |
1da177e4 | 3644 | { |
433d49c3 | 3645 | int ret; |
8d0b94af | 3646 | int cpu; |
433d49c3 | 3647 | |
9a7ec3a9 DL |
3648 | ret = -ENOMEM; |
3649 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3650 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3651 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3652 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3653 | goto out; |
14e50e57 | 3654 | |
fc66f95c | 3655 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3656 | if (ret) |
bdb3289f | 3657 | goto out_kmem_cache; |
bdb3289f | 3658 | |
c3426b47 DM |
3659 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3660 | if (ret) | |
e8803b6c | 3661 | goto out_dst_entries; |
2a0c451a | 3662 | |
7e52b33b DM |
3663 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3664 | if (ret) | |
3665 | goto out_register_inetpeer; | |
c3426b47 | 3666 | |
5dc121e9 AE |
3667 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3668 | ||
8ed67789 DL |
3669 | /* Registering of the loopback is done before this portion of code, |
3670 | * the loopback reference in rt6_info will not be taken, do it | |
3671 | * manually for init_net */ | |
d8d1f30b | 3672 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3673 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3674 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3675 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3676 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3677 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3678 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3679 | #endif | |
e8803b6c | 3680 | ret = fib6_init(); |
433d49c3 | 3681 | if (ret) |
8ed67789 | 3682 | goto out_register_subsys; |
433d49c3 | 3683 | |
433d49c3 DL |
3684 | ret = xfrm6_init(); |
3685 | if (ret) | |
e8803b6c | 3686 | goto out_fib6_init; |
c35b7e72 | 3687 | |
433d49c3 DL |
3688 | ret = fib6_rules_init(); |
3689 | if (ret) | |
3690 | goto xfrm6_init; | |
7e5449c2 | 3691 | |
d189634e TG |
3692 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3693 | if (ret) | |
3694 | goto fib6_rules_init; | |
3695 | ||
433d49c3 | 3696 | ret = -ENOBUFS; |
c7ac8679 GR |
3697 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3698 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3699 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3700 | goto out_register_late_subsys; |
c127ea2c | 3701 | |
8ed67789 | 3702 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3703 | if (ret) |
d189634e | 3704 | goto out_register_late_subsys; |
8ed67789 | 3705 | |
8d0b94af MKL |
3706 | for_each_possible_cpu(cpu) { |
3707 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
3708 | ||
3709 | INIT_LIST_HEAD(&ul->head); | |
3710 | spin_lock_init(&ul->lock); | |
3711 | } | |
3712 | ||
433d49c3 DL |
3713 | out: |
3714 | return ret; | |
3715 | ||
d189634e TG |
3716 | out_register_late_subsys: |
3717 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3718 | fib6_rules_init: |
433d49c3 DL |
3719 | fib6_rules_cleanup(); |
3720 | xfrm6_init: | |
433d49c3 | 3721 | xfrm6_fini(); |
2a0c451a TG |
3722 | out_fib6_init: |
3723 | fib6_gc_cleanup(); | |
8ed67789 DL |
3724 | out_register_subsys: |
3725 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3726 | out_register_inetpeer: |
3727 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3728 | out_dst_entries: |
3729 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3730 | out_kmem_cache: |
f2fc6a54 | 3731 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3732 | goto out; |
1da177e4 LT |
3733 | } |
3734 | ||
3735 | void ip6_route_cleanup(void) | |
3736 | { | |
8ed67789 | 3737 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3738 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3739 | fib6_rules_cleanup(); |
1da177e4 | 3740 | xfrm6_fini(); |
1da177e4 | 3741 | fib6_gc_cleanup(); |
c3426b47 | 3742 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3743 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3744 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3745 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3746 | } |