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> |
ca254490 | 64 | #include <net/l3mdev.h> |
b811580d | 65 | #include <trace/events/fib6.h> |
1da177e4 LT |
66 | |
67 | #include <asm/uaccess.h> | |
68 | ||
69 | #ifdef CONFIG_SYSCTL | |
70 | #include <linux/sysctl.h> | |
71 | #endif | |
72 | ||
afc154e9 | 73 | enum rt6_nud_state { |
7e980569 JB |
74 | RT6_NUD_FAIL_HARD = -3, |
75 | RT6_NUD_FAIL_PROBE = -2, | |
76 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
77 | RT6_NUD_SUCCEED = 1 |
78 | }; | |
79 | ||
83a09abd | 80 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort); |
1da177e4 | 81 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 82 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 83 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
84 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
85 | static void ip6_dst_destroy(struct dst_entry *); | |
86 | static void ip6_dst_ifdown(struct dst_entry *, | |
87 | struct net_device *dev, int how); | |
569d3645 | 88 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
89 | |
90 | static int ip6_pkt_discard(struct sk_buff *skb); | |
ede2059d | 91 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
7150aede | 92 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
ede2059d | 93 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 94 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
95 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
96 | struct sk_buff *skb, u32 mtu); | |
97 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
98 | struct sk_buff *skb); | |
4b32b5ad | 99 | static void rt6_dst_from_metrics_check(struct rt6_info *rt); |
52bd4c0c | 100 | static int rt6_score_route(struct rt6_info *rt, int oif, int strict); |
1da177e4 | 101 | |
70ceb4f5 | 102 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 103 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
104 | const struct in6_addr *prefix, int prefixlen, |
105 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 106 | unsigned int pref); |
efa2cea0 | 107 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
108 | const struct in6_addr *prefix, int prefixlen, |
109 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
110 | #endif |
111 | ||
8d0b94af MKL |
112 | struct uncached_list { |
113 | spinlock_t lock; | |
114 | struct list_head head; | |
115 | }; | |
116 | ||
117 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
118 | ||
119 | static void rt6_uncached_list_add(struct rt6_info *rt) | |
120 | { | |
121 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
122 | ||
123 | rt->dst.flags |= DST_NOCACHE; | |
124 | rt->rt6i_uncached_list = ul; | |
125 | ||
126 | spin_lock_bh(&ul->lock); | |
127 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
128 | spin_unlock_bh(&ul->lock); | |
129 | } | |
130 | ||
131 | static void rt6_uncached_list_del(struct rt6_info *rt) | |
132 | { | |
133 | if (!list_empty(&rt->rt6i_uncached)) { | |
134 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
135 | ||
136 | spin_lock_bh(&ul->lock); | |
137 | list_del(&rt->rt6i_uncached); | |
138 | spin_unlock_bh(&ul->lock); | |
139 | } | |
140 | } | |
141 | ||
142 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
143 | { | |
144 | struct net_device *loopback_dev = net->loopback_dev; | |
145 | int cpu; | |
146 | ||
e332bc67 EB |
147 | if (dev == loopback_dev) |
148 | return; | |
149 | ||
8d0b94af MKL |
150 | for_each_possible_cpu(cpu) { |
151 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
152 | struct rt6_info *rt; | |
153 | ||
154 | spin_lock_bh(&ul->lock); | |
155 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
156 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
157 | struct net_device *rt_dev = rt->dst.dev; | |
158 | ||
e332bc67 | 159 | if (rt_idev->dev == dev) { |
8d0b94af MKL |
160 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
161 | in6_dev_put(rt_idev); | |
162 | } | |
163 | ||
e332bc67 | 164 | if (rt_dev == dev) { |
8d0b94af MKL |
165 | rt->dst.dev = loopback_dev; |
166 | dev_hold(rt->dst.dev); | |
167 | dev_put(rt_dev); | |
168 | } | |
169 | } | |
170 | spin_unlock_bh(&ul->lock); | |
171 | } | |
172 | } | |
173 | ||
d52d3997 MKL |
174 | static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt) |
175 | { | |
176 | return dst_metrics_write_ptr(rt->dst.from); | |
177 | } | |
178 | ||
06582540 DM |
179 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
180 | { | |
4b32b5ad | 181 | struct rt6_info *rt = (struct rt6_info *)dst; |
06582540 | 182 | |
d52d3997 MKL |
183 | if (rt->rt6i_flags & RTF_PCPU) |
184 | return rt6_pcpu_cow_metrics(rt); | |
185 | else if (rt->rt6i_flags & RTF_CACHE) | |
4b32b5ad MKL |
186 | return NULL; |
187 | else | |
3b471175 | 188 | return dst_cow_metrics_generic(dst, old); |
06582540 DM |
189 | } |
190 | ||
f894cbf8 DM |
191 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
192 | struct sk_buff *skb, | |
193 | const void *daddr) | |
39232973 DM |
194 | { |
195 | struct in6_addr *p = &rt->rt6i_gateway; | |
196 | ||
a7563f34 | 197 | if (!ipv6_addr_any(p)) |
39232973 | 198 | return (const void *) p; |
f894cbf8 DM |
199 | else if (skb) |
200 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
201 | return daddr; |
202 | } | |
203 | ||
f894cbf8 DM |
204 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
205 | struct sk_buff *skb, | |
206 | const void *daddr) | |
d3aaeb38 | 207 | { |
39232973 DM |
208 | struct rt6_info *rt = (struct rt6_info *) dst; |
209 | struct neighbour *n; | |
210 | ||
f894cbf8 | 211 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 212 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
213 | if (n) |
214 | return n; | |
215 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
216 | } | |
217 | ||
9a7ec3a9 | 218 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 219 | .family = AF_INET6, |
1da177e4 LT |
220 | .gc = ip6_dst_gc, |
221 | .gc_thresh = 1024, | |
222 | .check = ip6_dst_check, | |
0dbaee3b | 223 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 224 | .mtu = ip6_mtu, |
06582540 | 225 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
226 | .destroy = ip6_dst_destroy, |
227 | .ifdown = ip6_dst_ifdown, | |
228 | .negative_advice = ip6_negative_advice, | |
229 | .link_failure = ip6_link_failure, | |
230 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 231 | .redirect = rt6_do_redirect, |
9f8955cc | 232 | .local_out = __ip6_local_out, |
d3aaeb38 | 233 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
234 | }; |
235 | ||
ebb762f2 | 236 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 237 | { |
618f9bc7 SK |
238 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
239 | ||
240 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
241 | } |
242 | ||
6700c270 DM |
243 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
244 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
245 | { |
246 | } | |
247 | ||
6700c270 DM |
248 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
249 | struct sk_buff *skb) | |
b587ee3b DM |
250 | { |
251 | } | |
252 | ||
14e50e57 DM |
253 | static struct dst_ops ip6_dst_blackhole_ops = { |
254 | .family = AF_INET6, | |
14e50e57 DM |
255 | .destroy = ip6_dst_destroy, |
256 | .check = ip6_dst_check, | |
ebb762f2 | 257 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 258 | .default_advmss = ip6_default_advmss, |
14e50e57 | 259 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 260 | .redirect = ip6_rt_blackhole_redirect, |
0a1f5962 | 261 | .cow_metrics = dst_cow_metrics_generic, |
d3aaeb38 | 262 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
263 | }; |
264 | ||
62fa8a84 | 265 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 266 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
267 | }; |
268 | ||
fb0af4c7 | 269 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
270 | .dst = { |
271 | .__refcnt = ATOMIC_INIT(1), | |
272 | .__use = 1, | |
2c20cbd7 | 273 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 274 | .error = -ENETUNREACH, |
d8d1f30b CG |
275 | .input = ip6_pkt_discard, |
276 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
277 | }, |
278 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 279 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
280 | .rt6i_metric = ~(u32) 0, |
281 | .rt6i_ref = ATOMIC_INIT(1), | |
282 | }; | |
283 | ||
101367c2 TG |
284 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
285 | ||
fb0af4c7 | 286 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
287 | .dst = { |
288 | .__refcnt = ATOMIC_INIT(1), | |
289 | .__use = 1, | |
2c20cbd7 | 290 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 291 | .error = -EACCES, |
d8d1f30b CG |
292 | .input = ip6_pkt_prohibit, |
293 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
294 | }, |
295 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 296 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
297 | .rt6i_metric = ~(u32) 0, |
298 | .rt6i_ref = ATOMIC_INIT(1), | |
299 | }; | |
300 | ||
fb0af4c7 | 301 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
302 | .dst = { |
303 | .__refcnt = ATOMIC_INIT(1), | |
304 | .__use = 1, | |
2c20cbd7 | 305 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 306 | .error = -EINVAL, |
d8d1f30b | 307 | .input = dst_discard, |
ede2059d | 308 | .output = dst_discard_out, |
101367c2 TG |
309 | }, |
310 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 311 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
312 | .rt6i_metric = ~(u32) 0, |
313 | .rt6i_ref = ATOMIC_INIT(1), | |
314 | }; | |
315 | ||
316 | #endif | |
317 | ||
ebfa45f0 MKL |
318 | static void rt6_info_init(struct rt6_info *rt) |
319 | { | |
320 | struct dst_entry *dst = &rt->dst; | |
321 | ||
322 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
323 | INIT_LIST_HEAD(&rt->rt6i_siblings); | |
324 | INIT_LIST_HEAD(&rt->rt6i_uncached); | |
325 | } | |
326 | ||
1da177e4 | 327 | /* allocate dst with ip6_dst_ops */ |
d52d3997 MKL |
328 | static struct rt6_info *__ip6_dst_alloc(struct net *net, |
329 | struct net_device *dev, | |
ad706862 | 330 | int flags) |
1da177e4 | 331 | { |
97bab73f | 332 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 333 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 334 | |
ebfa45f0 MKL |
335 | if (rt) |
336 | rt6_info_init(rt); | |
8104891b | 337 | |
cf911662 | 338 | return rt; |
1da177e4 LT |
339 | } |
340 | ||
9ab179d8 DA |
341 | struct rt6_info *ip6_dst_alloc(struct net *net, |
342 | struct net_device *dev, | |
343 | int flags) | |
d52d3997 | 344 | { |
ad706862 | 345 | struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags); |
d52d3997 MKL |
346 | |
347 | if (rt) { | |
348 | rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC); | |
349 | if (rt->rt6i_pcpu) { | |
350 | int cpu; | |
351 | ||
352 | for_each_possible_cpu(cpu) { | |
353 | struct rt6_info **p; | |
354 | ||
355 | p = per_cpu_ptr(rt->rt6i_pcpu, cpu); | |
356 | /* no one shares rt */ | |
357 | *p = NULL; | |
358 | } | |
359 | } else { | |
360 | dst_destroy((struct dst_entry *)rt); | |
361 | return NULL; | |
362 | } | |
363 | } | |
364 | ||
365 | return rt; | |
366 | } | |
9ab179d8 | 367 | EXPORT_SYMBOL(ip6_dst_alloc); |
d52d3997 | 368 | |
1da177e4 LT |
369 | static void ip6_dst_destroy(struct dst_entry *dst) |
370 | { | |
371 | struct rt6_info *rt = (struct rt6_info *)dst; | |
ecd98837 | 372 | struct dst_entry *from = dst->from; |
8d0b94af | 373 | struct inet6_dev *idev; |
1da177e4 | 374 | |
4b32b5ad | 375 | dst_destroy_metrics_generic(dst); |
87775312 | 376 | free_percpu(rt->rt6i_pcpu); |
8d0b94af MKL |
377 | rt6_uncached_list_del(rt); |
378 | ||
379 | idev = rt->rt6i_idev; | |
38308473 | 380 | if (idev) { |
1da177e4 LT |
381 | rt->rt6i_idev = NULL; |
382 | in6_dev_put(idev); | |
1ab1457c | 383 | } |
1716a961 | 384 | |
ecd98837 YH |
385 | dst->from = NULL; |
386 | dst_release(from); | |
b3419363 DM |
387 | } |
388 | ||
1da177e4 LT |
389 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
390 | int how) | |
391 | { | |
392 | struct rt6_info *rt = (struct rt6_info *)dst; | |
393 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 394 | struct net_device *loopback_dev = |
c346dca1 | 395 | dev_net(dev)->loopback_dev; |
1da177e4 | 396 | |
97cac082 DM |
397 | if (dev != loopback_dev) { |
398 | if (idev && idev->dev == dev) { | |
399 | struct inet6_dev *loopback_idev = | |
400 | in6_dev_get(loopback_dev); | |
401 | if (loopback_idev) { | |
402 | rt->rt6i_idev = loopback_idev; | |
403 | in6_dev_put(idev); | |
404 | } | |
405 | } | |
1da177e4 LT |
406 | } |
407 | } | |
408 | ||
5973fb1e MKL |
409 | static bool __rt6_check_expired(const struct rt6_info *rt) |
410 | { | |
411 | if (rt->rt6i_flags & RTF_EXPIRES) | |
412 | return time_after(jiffies, rt->dst.expires); | |
413 | else | |
414 | return false; | |
415 | } | |
416 | ||
a50feda5 | 417 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 418 | { |
1716a961 G |
419 | if (rt->rt6i_flags & RTF_EXPIRES) { |
420 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 421 | return true; |
1716a961 | 422 | } else if (rt->dst.from) { |
3fd91fb3 | 423 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 424 | } |
a50feda5 | 425 | return false; |
1da177e4 LT |
426 | } |
427 | ||
51ebd318 ND |
428 | /* Multipath route selection: |
429 | * Hash based function using packet header and flowlabel. | |
430 | * Adapted from fib_info_hashfn() | |
431 | */ | |
432 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
433 | const struct flowi6 *fl6) | |
434 | { | |
644d0e65 | 435 | return get_hash_from_flowi6(fl6) % candidate_count; |
51ebd318 ND |
436 | } |
437 | ||
438 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
52bd4c0c ND |
439 | struct flowi6 *fl6, int oif, |
440 | int strict) | |
51ebd318 ND |
441 | { |
442 | struct rt6_info *sibling, *next_sibling; | |
443 | int route_choosen; | |
444 | ||
445 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
446 | /* Don't change the route, if route_choosen == 0 | |
447 | * (siblings does not include ourself) | |
448 | */ | |
449 | if (route_choosen) | |
450 | list_for_each_entry_safe(sibling, next_sibling, | |
451 | &match->rt6i_siblings, rt6i_siblings) { | |
452 | route_choosen--; | |
453 | if (route_choosen == 0) { | |
52bd4c0c ND |
454 | if (rt6_score_route(sibling, oif, strict) < 0) |
455 | break; | |
51ebd318 ND |
456 | match = sibling; |
457 | break; | |
458 | } | |
459 | } | |
460 | return match; | |
461 | } | |
462 | ||
1da177e4 | 463 | /* |
c71099ac | 464 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
465 | */ |
466 | ||
8ed67789 DL |
467 | static inline struct rt6_info *rt6_device_match(struct net *net, |
468 | struct rt6_info *rt, | |
b71d1d42 | 469 | const struct in6_addr *saddr, |
1da177e4 | 470 | int oif, |
d420895e | 471 | int flags) |
1da177e4 LT |
472 | { |
473 | struct rt6_info *local = NULL; | |
474 | struct rt6_info *sprt; | |
475 | ||
dd3abc4e YH |
476 | if (!oif && ipv6_addr_any(saddr)) |
477 | goto out; | |
478 | ||
d8d1f30b | 479 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 480 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
481 | |
482 | if (oif) { | |
1da177e4 LT |
483 | if (dev->ifindex == oif) |
484 | return sprt; | |
485 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 486 | if (!sprt->rt6i_idev || |
1da177e4 | 487 | sprt->rt6i_idev->dev->ifindex != oif) { |
17fb0b2b | 488 | if (flags & RT6_LOOKUP_F_IFACE) |
1da177e4 | 489 | continue; |
17fb0b2b DA |
490 | if (local && |
491 | local->rt6i_idev->dev->ifindex == oif) | |
1da177e4 LT |
492 | continue; |
493 | } | |
494 | local = sprt; | |
495 | } | |
dd3abc4e YH |
496 | } else { |
497 | if (ipv6_chk_addr(net, saddr, dev, | |
498 | flags & RT6_LOOKUP_F_IFACE)) | |
499 | return sprt; | |
1da177e4 | 500 | } |
dd3abc4e | 501 | } |
1da177e4 | 502 | |
dd3abc4e | 503 | if (oif) { |
1da177e4 LT |
504 | if (local) |
505 | return local; | |
506 | ||
d420895e | 507 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 508 | return net->ipv6.ip6_null_entry; |
1da177e4 | 509 | } |
dd3abc4e | 510 | out: |
1da177e4 LT |
511 | return rt; |
512 | } | |
513 | ||
27097255 | 514 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
515 | struct __rt6_probe_work { |
516 | struct work_struct work; | |
517 | struct in6_addr target; | |
518 | struct net_device *dev; | |
519 | }; | |
520 | ||
521 | static void rt6_probe_deferred(struct work_struct *w) | |
522 | { | |
523 | struct in6_addr mcaddr; | |
524 | struct __rt6_probe_work *work = | |
525 | container_of(w, struct __rt6_probe_work, work); | |
526 | ||
527 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
304d888b | 528 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL); |
c2f17e82 | 529 | dev_put(work->dev); |
662f5533 | 530 | kfree(work); |
c2f17e82 HFS |
531 | } |
532 | ||
27097255 YH |
533 | static void rt6_probe(struct rt6_info *rt) |
534 | { | |
990edb42 | 535 | struct __rt6_probe_work *work; |
f2c31e32 | 536 | struct neighbour *neigh; |
27097255 YH |
537 | /* |
538 | * Okay, this does not seem to be appropriate | |
539 | * for now, however, we need to check if it | |
540 | * is really so; aka Router Reachability Probing. | |
541 | * | |
542 | * Router Reachability Probe MUST be rate-limited | |
543 | * to no more than one per minute. | |
544 | */ | |
2152caea | 545 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 546 | return; |
2152caea YH |
547 | rcu_read_lock_bh(); |
548 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
549 | if (neigh) { | |
8d6c31bf MKL |
550 | if (neigh->nud_state & NUD_VALID) |
551 | goto out; | |
552 | ||
990edb42 | 553 | work = NULL; |
2152caea | 554 | write_lock(&neigh->lock); |
990edb42 MKL |
555 | if (!(neigh->nud_state & NUD_VALID) && |
556 | time_after(jiffies, | |
557 | neigh->updated + | |
558 | rt->rt6i_idev->cnf.rtr_probe_interval)) { | |
559 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
560 | if (work) | |
561 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 562 | } |
2152caea | 563 | write_unlock(&neigh->lock); |
990edb42 MKL |
564 | } else { |
565 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
f2c31e32 | 566 | } |
990edb42 MKL |
567 | |
568 | if (work) { | |
569 | INIT_WORK(&work->work, rt6_probe_deferred); | |
570 | work->target = rt->rt6i_gateway; | |
571 | dev_hold(rt->dst.dev); | |
572 | work->dev = rt->dst.dev; | |
573 | schedule_work(&work->work); | |
574 | } | |
575 | ||
8d6c31bf | 576 | out: |
2152caea | 577 | rcu_read_unlock_bh(); |
27097255 YH |
578 | } |
579 | #else | |
580 | static inline void rt6_probe(struct rt6_info *rt) | |
581 | { | |
27097255 YH |
582 | } |
583 | #endif | |
584 | ||
1da177e4 | 585 | /* |
554cfb7e | 586 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 587 | */ |
b6f99a21 | 588 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 589 | { |
d1918542 | 590 | struct net_device *dev = rt->dst.dev; |
161980f4 | 591 | if (!oif || dev->ifindex == oif) |
554cfb7e | 592 | return 2; |
161980f4 DM |
593 | if ((dev->flags & IFF_LOOPBACK) && |
594 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
595 | return 1; | |
596 | return 0; | |
554cfb7e | 597 | } |
1da177e4 | 598 | |
afc154e9 | 599 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 600 | { |
f2c31e32 | 601 | struct neighbour *neigh; |
afc154e9 | 602 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 603 | |
4d0c5911 YH |
604 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
605 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 606 | return RT6_NUD_SUCCEED; |
145a3621 YH |
607 | |
608 | rcu_read_lock_bh(); | |
609 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
610 | if (neigh) { | |
611 | read_lock(&neigh->lock); | |
554cfb7e | 612 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 613 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 614 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 615 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 616 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
617 | else |
618 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 619 | #endif |
145a3621 | 620 | read_unlock(&neigh->lock); |
afc154e9 HFS |
621 | } else { |
622 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 623 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 624 | } |
145a3621 YH |
625 | rcu_read_unlock_bh(); |
626 | ||
a5a81f0b | 627 | return ret; |
1da177e4 LT |
628 | } |
629 | ||
554cfb7e YH |
630 | static int rt6_score_route(struct rt6_info *rt, int oif, |
631 | int strict) | |
1da177e4 | 632 | { |
a5a81f0b | 633 | int m; |
1ab1457c | 634 | |
4d0c5911 | 635 | m = rt6_check_dev(rt, oif); |
77d16f45 | 636 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 637 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
638 | #ifdef CONFIG_IPV6_ROUTER_PREF |
639 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
640 | #endif | |
afc154e9 HFS |
641 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
642 | int n = rt6_check_neigh(rt); | |
643 | if (n < 0) | |
644 | return n; | |
645 | } | |
554cfb7e YH |
646 | return m; |
647 | } | |
648 | ||
f11e6659 | 649 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
650 | int *mpri, struct rt6_info *match, |
651 | bool *do_rr) | |
554cfb7e | 652 | { |
f11e6659 | 653 | int m; |
afc154e9 | 654 | bool match_do_rr = false; |
35103d11 AG |
655 | struct inet6_dev *idev = rt->rt6i_idev; |
656 | struct net_device *dev = rt->dst.dev; | |
657 | ||
658 | if (dev && !netif_carrier_ok(dev) && | |
659 | idev->cnf.ignore_routes_with_linkdown) | |
660 | goto out; | |
f11e6659 DM |
661 | |
662 | if (rt6_check_expired(rt)) | |
663 | goto out; | |
664 | ||
665 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 666 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
667 | match_do_rr = true; |
668 | m = 0; /* lowest valid score */ | |
7e980569 | 669 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 670 | goto out; |
afc154e9 HFS |
671 | } |
672 | ||
673 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
674 | rt6_probe(rt); | |
f11e6659 | 675 | |
7e980569 | 676 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 677 | if (m > *mpri) { |
afc154e9 | 678 | *do_rr = match_do_rr; |
f11e6659 DM |
679 | *mpri = m; |
680 | match = rt; | |
f11e6659 | 681 | } |
f11e6659 DM |
682 | out: |
683 | return match; | |
684 | } | |
685 | ||
686 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
687 | struct rt6_info *rr_head, | |
afc154e9 HFS |
688 | u32 metric, int oif, int strict, |
689 | bool *do_rr) | |
f11e6659 | 690 | { |
9fbdcfaf | 691 | struct rt6_info *rt, *match, *cont; |
554cfb7e | 692 | int mpri = -1; |
1da177e4 | 693 | |
f11e6659 | 694 | match = NULL; |
9fbdcfaf SK |
695 | cont = NULL; |
696 | for (rt = rr_head; rt; rt = rt->dst.rt6_next) { | |
697 | if (rt->rt6i_metric != metric) { | |
698 | cont = rt; | |
699 | break; | |
700 | } | |
701 | ||
702 | match = find_match(rt, oif, strict, &mpri, match, do_rr); | |
703 | } | |
704 | ||
705 | for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) { | |
706 | if (rt->rt6i_metric != metric) { | |
707 | cont = rt; | |
708 | break; | |
709 | } | |
710 | ||
afc154e9 | 711 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
9fbdcfaf SK |
712 | } |
713 | ||
714 | if (match || !cont) | |
715 | return match; | |
716 | ||
717 | for (rt = cont; rt; rt = rt->dst.rt6_next) | |
afc154e9 | 718 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 719 | |
f11e6659 DM |
720 | return match; |
721 | } | |
1da177e4 | 722 | |
f11e6659 DM |
723 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
724 | { | |
725 | struct rt6_info *match, *rt0; | |
8ed67789 | 726 | struct net *net; |
afc154e9 | 727 | bool do_rr = false; |
1da177e4 | 728 | |
f11e6659 DM |
729 | rt0 = fn->rr_ptr; |
730 | if (!rt0) | |
731 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 732 | |
afc154e9 HFS |
733 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
734 | &do_rr); | |
1da177e4 | 735 | |
afc154e9 | 736 | if (do_rr) { |
d8d1f30b | 737 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 738 | |
554cfb7e | 739 | /* no entries matched; do round-robin */ |
f11e6659 DM |
740 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
741 | next = fn->leaf; | |
742 | ||
743 | if (next != rt0) | |
744 | fn->rr_ptr = next; | |
1da177e4 | 745 | } |
1da177e4 | 746 | |
d1918542 | 747 | net = dev_net(rt0->dst.dev); |
a02cec21 | 748 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
749 | } |
750 | ||
8b9df265 MKL |
751 | static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt) |
752 | { | |
753 | return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)); | |
754 | } | |
755 | ||
70ceb4f5 YH |
756 | #ifdef CONFIG_IPV6_ROUTE_INFO |
757 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 758 | const struct in6_addr *gwaddr) |
70ceb4f5 | 759 | { |
c346dca1 | 760 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
761 | struct route_info *rinfo = (struct route_info *) opt; |
762 | struct in6_addr prefix_buf, *prefix; | |
763 | unsigned int pref; | |
4bed72e4 | 764 | unsigned long lifetime; |
70ceb4f5 YH |
765 | struct rt6_info *rt; |
766 | ||
767 | if (len < sizeof(struct route_info)) { | |
768 | return -EINVAL; | |
769 | } | |
770 | ||
771 | /* Sanity check for prefix_len and length */ | |
772 | if (rinfo->length > 3) { | |
773 | return -EINVAL; | |
774 | } else if (rinfo->prefix_len > 128) { | |
775 | return -EINVAL; | |
776 | } else if (rinfo->prefix_len > 64) { | |
777 | if (rinfo->length < 2) { | |
778 | return -EINVAL; | |
779 | } | |
780 | } else if (rinfo->prefix_len > 0) { | |
781 | if (rinfo->length < 1) { | |
782 | return -EINVAL; | |
783 | } | |
784 | } | |
785 | ||
786 | pref = rinfo->route_pref; | |
787 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 788 | return -EINVAL; |
70ceb4f5 | 789 | |
4bed72e4 | 790 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
791 | |
792 | if (rinfo->length == 3) | |
793 | prefix = (struct in6_addr *)rinfo->prefix; | |
794 | else { | |
795 | /* this function is safe */ | |
796 | ipv6_addr_prefix(&prefix_buf, | |
797 | (struct in6_addr *)rinfo->prefix, | |
798 | rinfo->prefix_len); | |
799 | prefix = &prefix_buf; | |
800 | } | |
801 | ||
f104a567 DJ |
802 | if (rinfo->prefix_len == 0) |
803 | rt = rt6_get_dflt_router(gwaddr, dev); | |
804 | else | |
805 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
806 | gwaddr, dev->ifindex); | |
70ceb4f5 YH |
807 | |
808 | if (rt && !lifetime) { | |
e0a1ad73 | 809 | ip6_del_rt(rt); |
70ceb4f5 YH |
810 | rt = NULL; |
811 | } | |
812 | ||
813 | if (!rt && lifetime) | |
efa2cea0 | 814 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
815 | pref); |
816 | else if (rt) | |
817 | rt->rt6i_flags = RTF_ROUTEINFO | | |
818 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
819 | ||
820 | if (rt) { | |
1716a961 G |
821 | if (!addrconf_finite_timeout(lifetime)) |
822 | rt6_clean_expires(rt); | |
823 | else | |
824 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
825 | ||
94e187c0 | 826 | ip6_rt_put(rt); |
70ceb4f5 YH |
827 | } |
828 | return 0; | |
829 | } | |
830 | #endif | |
831 | ||
a3c00e46 MKL |
832 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
833 | struct in6_addr *saddr) | |
834 | { | |
835 | struct fib6_node *pn; | |
836 | while (1) { | |
837 | if (fn->fn_flags & RTN_TL_ROOT) | |
838 | return NULL; | |
839 | pn = fn->parent; | |
840 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) | |
841 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); | |
842 | else | |
843 | fn = pn; | |
844 | if (fn->fn_flags & RTN_RTINFO) | |
845 | return fn; | |
846 | } | |
847 | } | |
c71099ac | 848 | |
8ed67789 DL |
849 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
850 | struct fib6_table *table, | |
4c9483b2 | 851 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
852 | { |
853 | struct fib6_node *fn; | |
854 | struct rt6_info *rt; | |
855 | ||
c71099ac | 856 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 857 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
858 | restart: |
859 | rt = fn->leaf; | |
4c9483b2 | 860 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 | 861 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
52bd4c0c | 862 | rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); |
a3c00e46 MKL |
863 | if (rt == net->ipv6.ip6_null_entry) { |
864 | fn = fib6_backtrack(fn, &fl6->saddr); | |
865 | if (fn) | |
866 | goto restart; | |
867 | } | |
d8d1f30b | 868 | dst_use(&rt->dst, jiffies); |
c71099ac | 869 | read_unlock_bh(&table->tb6_lock); |
b811580d DA |
870 | |
871 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); | |
872 | ||
c71099ac TG |
873 | return rt; |
874 | ||
875 | } | |
876 | ||
67ba4152 | 877 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
ea6e574e FW |
878 | int flags) |
879 | { | |
880 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
881 | } | |
882 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
883 | ||
9acd9f3a YH |
884 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
885 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 886 | { |
4c9483b2 DM |
887 | struct flowi6 fl6 = { |
888 | .flowi6_oif = oif, | |
889 | .daddr = *daddr, | |
c71099ac TG |
890 | }; |
891 | struct dst_entry *dst; | |
77d16f45 | 892 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 893 | |
adaa70bb | 894 | if (saddr) { |
4c9483b2 | 895 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
896 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
897 | } | |
898 | ||
4c9483b2 | 899 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
900 | if (dst->error == 0) |
901 | return (struct rt6_info *) dst; | |
902 | ||
903 | dst_release(dst); | |
904 | ||
1da177e4 LT |
905 | return NULL; |
906 | } | |
7159039a YH |
907 | EXPORT_SYMBOL(rt6_lookup); |
908 | ||
c71099ac | 909 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
910 | It takes new route entry, the addition fails by any reason the |
911 | route is freed. In any case, if caller does not hold it, it may | |
912 | be destroyed. | |
913 | */ | |
914 | ||
e5fd387a | 915 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, |
e715b6d3 | 916 | struct mx6_config *mxc) |
1da177e4 LT |
917 | { |
918 | int err; | |
c71099ac | 919 | struct fib6_table *table; |
1da177e4 | 920 | |
c71099ac TG |
921 | table = rt->rt6i_table; |
922 | write_lock_bh(&table->tb6_lock); | |
e715b6d3 | 923 | err = fib6_add(&table->tb6_root, rt, info, mxc); |
c71099ac | 924 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
925 | |
926 | return err; | |
927 | } | |
928 | ||
40e22e8f TG |
929 | int ip6_ins_rt(struct rt6_info *rt) |
930 | { | |
e715b6d3 FW |
931 | struct nl_info info = { .nl_net = dev_net(rt->dst.dev), }; |
932 | struct mx6_config mxc = { .mx = NULL, }; | |
933 | ||
934 | return __ip6_ins_rt(rt, &info, &mxc); | |
40e22e8f TG |
935 | } |
936 | ||
8b9df265 MKL |
937 | static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort, |
938 | const struct in6_addr *daddr, | |
939 | const struct in6_addr *saddr) | |
1da177e4 | 940 | { |
1da177e4 LT |
941 | struct rt6_info *rt; |
942 | ||
943 | /* | |
944 | * Clone the route. | |
945 | */ | |
946 | ||
d52d3997 | 947 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) |
83a09abd | 948 | ort = (struct rt6_info *)ort->dst.from; |
1da177e4 | 949 | |
ad706862 | 950 | rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0); |
83a09abd MKL |
951 | |
952 | if (!rt) | |
953 | return NULL; | |
954 | ||
955 | ip6_rt_copy_init(rt, ort); | |
956 | rt->rt6i_flags |= RTF_CACHE; | |
957 | rt->rt6i_metric = 0; | |
958 | rt->dst.flags |= DST_HOST; | |
959 | rt->rt6i_dst.addr = *daddr; | |
960 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 961 | |
83a09abd MKL |
962 | if (!rt6_is_gw_or_nonexthop(ort)) { |
963 | if (ort->rt6i_dst.plen != 128 && | |
964 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
965 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 966 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
967 | if (rt->rt6i_src.plen && saddr) { |
968 | rt->rt6i_src.addr = *saddr; | |
969 | rt->rt6i_src.plen = 128; | |
8b9df265 | 970 | } |
83a09abd | 971 | #endif |
95a9a5ba | 972 | } |
1da177e4 | 973 | |
95a9a5ba YH |
974 | return rt; |
975 | } | |
1da177e4 | 976 | |
d52d3997 MKL |
977 | static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt) |
978 | { | |
979 | struct rt6_info *pcpu_rt; | |
980 | ||
981 | pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev), | |
ad706862 | 982 | rt->dst.dev, rt->dst.flags); |
d52d3997 MKL |
983 | |
984 | if (!pcpu_rt) | |
985 | return NULL; | |
986 | ip6_rt_copy_init(pcpu_rt, rt); | |
987 | pcpu_rt->rt6i_protocol = rt->rt6i_protocol; | |
988 | pcpu_rt->rt6i_flags |= RTF_PCPU; | |
989 | return pcpu_rt; | |
990 | } | |
991 | ||
992 | /* It should be called with read_lock_bh(&tb6_lock) acquired */ | |
993 | static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt) | |
994 | { | |
a73e4195 | 995 | struct rt6_info *pcpu_rt, **p; |
d52d3997 MKL |
996 | |
997 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
998 | pcpu_rt = *p; | |
999 | ||
a73e4195 MKL |
1000 | if (pcpu_rt) { |
1001 | dst_hold(&pcpu_rt->dst); | |
1002 | rt6_dst_from_metrics_check(pcpu_rt); | |
1003 | } | |
1004 | return pcpu_rt; | |
1005 | } | |
1006 | ||
1007 | static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt) | |
1008 | { | |
9c7370a1 | 1009 | struct fib6_table *table = rt->rt6i_table; |
a73e4195 | 1010 | struct rt6_info *pcpu_rt, *prev, **p; |
d52d3997 MKL |
1011 | |
1012 | pcpu_rt = ip6_rt_pcpu_alloc(rt); | |
1013 | if (!pcpu_rt) { | |
1014 | struct net *net = dev_net(rt->dst.dev); | |
1015 | ||
9c7370a1 MKL |
1016 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
1017 | return net->ipv6.ip6_null_entry; | |
d52d3997 MKL |
1018 | } |
1019 | ||
9c7370a1 MKL |
1020 | read_lock_bh(&table->tb6_lock); |
1021 | if (rt->rt6i_pcpu) { | |
1022 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1023 | prev = cmpxchg(p, NULL, pcpu_rt); | |
1024 | if (prev) { | |
1025 | /* If someone did it before us, return prev instead */ | |
1026 | dst_destroy(&pcpu_rt->dst); | |
1027 | pcpu_rt = prev; | |
1028 | } | |
1029 | } else { | |
1030 | /* rt has been removed from the fib6 tree | |
1031 | * before we have a chance to acquire the read_lock. | |
1032 | * In this case, don't brother to create a pcpu rt | |
1033 | * since rt is going away anyway. The next | |
1034 | * dst_check() will trigger a re-lookup. | |
1035 | */ | |
d52d3997 | 1036 | dst_destroy(&pcpu_rt->dst); |
9c7370a1 | 1037 | pcpu_rt = rt; |
d52d3997 | 1038 | } |
d52d3997 MKL |
1039 | dst_hold(&pcpu_rt->dst); |
1040 | rt6_dst_from_metrics_check(pcpu_rt); | |
9c7370a1 | 1041 | read_unlock_bh(&table->tb6_lock); |
d52d3997 MKL |
1042 | return pcpu_rt; |
1043 | } | |
1044 | ||
9ff74384 DA |
1045 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, |
1046 | int oif, struct flowi6 *fl6, int flags) | |
1da177e4 | 1047 | { |
367efcb9 | 1048 | struct fib6_node *fn, *saved_fn; |
45e4fd26 | 1049 | struct rt6_info *rt; |
c71099ac | 1050 | int strict = 0; |
1da177e4 | 1051 | |
77d16f45 | 1052 | strict |= flags & RT6_LOOKUP_F_IFACE; |
367efcb9 MKL |
1053 | if (net->ipv6.devconf_all->forwarding == 0) |
1054 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1da177e4 | 1055 | |
c71099ac | 1056 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 1057 | |
4c9483b2 | 1058 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 1059 | saved_fn = fn; |
1da177e4 | 1060 | |
ca254490 DA |
1061 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1062 | oif = 0; | |
1063 | ||
a3c00e46 | 1064 | redo_rt6_select: |
367efcb9 | 1065 | rt = rt6_select(fn, oif, strict); |
52bd4c0c | 1066 | if (rt->rt6i_nsiblings) |
367efcb9 | 1067 | rt = rt6_multipath_select(rt, fl6, oif, strict); |
a3c00e46 MKL |
1068 | if (rt == net->ipv6.ip6_null_entry) { |
1069 | fn = fib6_backtrack(fn, &fl6->saddr); | |
1070 | if (fn) | |
1071 | goto redo_rt6_select; | |
367efcb9 MKL |
1072 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
1073 | /* also consider unreachable route */ | |
1074 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
1075 | fn = saved_fn; | |
1076 | goto redo_rt6_select; | |
367efcb9 | 1077 | } |
a3c00e46 MKL |
1078 | } |
1079 | ||
fb9de91e | 1080 | |
3da59bd9 | 1081 | if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) { |
d52d3997 MKL |
1082 | dst_use(&rt->dst, jiffies); |
1083 | read_unlock_bh(&table->tb6_lock); | |
1084 | ||
1085 | rt6_dst_from_metrics_check(rt); | |
b811580d DA |
1086 | |
1087 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); | |
d52d3997 | 1088 | return rt; |
3da59bd9 MKL |
1089 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
1090 | !(rt->rt6i_flags & RTF_GATEWAY))) { | |
1091 | /* Create a RTF_CACHE clone which will not be | |
1092 | * owned by the fib6 tree. It is for the special case where | |
1093 | * the daddr in the skb during the neighbor look-up is different | |
1094 | * from the fl6->daddr used to look-up route here. | |
1095 | */ | |
1096 | ||
1097 | struct rt6_info *uncached_rt; | |
1098 | ||
d52d3997 MKL |
1099 | dst_use(&rt->dst, jiffies); |
1100 | read_unlock_bh(&table->tb6_lock); | |
1101 | ||
3da59bd9 MKL |
1102 | uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL); |
1103 | dst_release(&rt->dst); | |
c71099ac | 1104 | |
3da59bd9 | 1105 | if (uncached_rt) |
8d0b94af | 1106 | rt6_uncached_list_add(uncached_rt); |
3da59bd9 MKL |
1107 | else |
1108 | uncached_rt = net->ipv6.ip6_null_entry; | |
d52d3997 | 1109 | |
3da59bd9 | 1110 | dst_hold(&uncached_rt->dst); |
b811580d DA |
1111 | |
1112 | trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6); | |
3da59bd9 | 1113 | return uncached_rt; |
3da59bd9 | 1114 | |
d52d3997 MKL |
1115 | } else { |
1116 | /* Get a percpu copy */ | |
1117 | ||
1118 | struct rt6_info *pcpu_rt; | |
1119 | ||
1120 | rt->dst.lastuse = jiffies; | |
1121 | rt->dst.__use++; | |
1122 | pcpu_rt = rt6_get_pcpu_route(rt); | |
d52d3997 | 1123 | |
9c7370a1 MKL |
1124 | if (pcpu_rt) { |
1125 | read_unlock_bh(&table->tb6_lock); | |
1126 | } else { | |
1127 | /* We have to do the read_unlock first | |
1128 | * because rt6_make_pcpu_route() may trigger | |
1129 | * ip6_dst_gc() which will take the write_lock. | |
1130 | */ | |
1131 | dst_hold(&rt->dst); | |
1132 | read_unlock_bh(&table->tb6_lock); | |
a73e4195 | 1133 | pcpu_rt = rt6_make_pcpu_route(rt); |
9c7370a1 MKL |
1134 | dst_release(&rt->dst); |
1135 | } | |
d52d3997 | 1136 | |
b811580d | 1137 | trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6); |
d52d3997 | 1138 | return pcpu_rt; |
9c7370a1 | 1139 | |
d52d3997 | 1140 | } |
1da177e4 | 1141 | } |
9ff74384 | 1142 | EXPORT_SYMBOL_GPL(ip6_pol_route); |
1da177e4 | 1143 | |
8ed67789 | 1144 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 1145 | struct flowi6 *fl6, int flags) |
4acad72d | 1146 | { |
4c9483b2 | 1147 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
1148 | } |
1149 | ||
72331bc0 SL |
1150 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
1151 | struct net_device *dev, | |
1152 | struct flowi6 *fl6, int flags) | |
1153 | { | |
1154 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1155 | flags |= RT6_LOOKUP_F_IFACE; | |
1156 | ||
1157 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1158 | } | |
1159 | ||
c71099ac TG |
1160 | void ip6_route_input(struct sk_buff *skb) |
1161 | { | |
b71d1d42 | 1162 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1163 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1164 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
904af04d | 1165 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 1166 | struct flowi6 fl6 = { |
e0d56fdd | 1167 | .flowi6_iif = skb->dev->ifindex, |
4c9483b2 DM |
1168 | .daddr = iph->daddr, |
1169 | .saddr = iph->saddr, | |
6502ca52 | 1170 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1171 | .flowi6_mark = skb->mark, |
1172 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1173 | }; |
adaa70bb | 1174 | |
904af04d | 1175 | tun_info = skb_tunnel_info(skb); |
46fa062a | 1176 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 1177 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
06e9d040 | 1178 | skb_dst_drop(skb); |
72331bc0 | 1179 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1180 | } |
1181 | ||
8ed67789 | 1182 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1183 | struct flowi6 *fl6, int flags) |
1da177e4 | 1184 | { |
4c9483b2 | 1185 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1186 | } |
1187 | ||
6f21c96a PA |
1188 | struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, |
1189 | struct flowi6 *fl6, int flags) | |
c71099ac | 1190 | { |
d46a9d67 | 1191 | bool any_src; |
c71099ac | 1192 | |
4c1feac5 DA |
1193 | if (rt6_need_strict(&fl6->daddr)) { |
1194 | struct dst_entry *dst; | |
1195 | ||
1196 | dst = l3mdev_link_scope_lookup(net, fl6); | |
1197 | if (dst) | |
1198 | return dst; | |
1199 | } | |
ca254490 | 1200 | |
1fb9489b | 1201 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1202 | |
d46a9d67 | 1203 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 1204 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 1205 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 1206 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1207 | |
d46a9d67 | 1208 | if (!any_src) |
adaa70bb | 1209 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1210 | else if (sk) |
1211 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1212 | |
4c9483b2 | 1213 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 | 1214 | } |
6f21c96a | 1215 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 1216 | |
2774c131 | 1217 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1218 | { |
5c1e6aa3 | 1219 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1220 | struct dst_entry *new = NULL; |
1221 | ||
f5b0a874 | 1222 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1223 | if (rt) { |
0a1f5962 | 1224 | rt6_info_init(rt); |
8104891b | 1225 | |
0a1f5962 | 1226 | new = &rt->dst; |
14e50e57 | 1227 | new->__use = 1; |
352e512c | 1228 | new->input = dst_discard; |
ede2059d | 1229 | new->output = dst_discard_out; |
14e50e57 | 1230 | |
0a1f5962 | 1231 | dst_copy_metrics(new, &ort->dst); |
14e50e57 DM |
1232 | rt->rt6i_idev = ort->rt6i_idev; |
1233 | if (rt->rt6i_idev) | |
1234 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1235 | |
4e3fd7a0 | 1236 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 1237 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
1238 | rt->rt6i_metric = 0; |
1239 | ||
1240 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1241 | #ifdef CONFIG_IPV6_SUBTREES | |
1242 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1243 | #endif | |
1244 | ||
1245 | dst_free(new); | |
1246 | } | |
1247 | ||
69ead7af DM |
1248 | dst_release(dst_orig); |
1249 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1250 | } |
14e50e57 | 1251 | |
1da177e4 LT |
1252 | /* |
1253 | * Destination cache support functions | |
1254 | */ | |
1255 | ||
4b32b5ad MKL |
1256 | static void rt6_dst_from_metrics_check(struct rt6_info *rt) |
1257 | { | |
1258 | if (rt->dst.from && | |
1259 | dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from)) | |
1260 | dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true); | |
1261 | } | |
1262 | ||
3da59bd9 MKL |
1263 | static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie) |
1264 | { | |
1265 | if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) | |
1266 | return NULL; | |
1267 | ||
1268 | if (rt6_check_expired(rt)) | |
1269 | return NULL; | |
1270 | ||
1271 | return &rt->dst; | |
1272 | } | |
1273 | ||
1274 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie) | |
1275 | { | |
5973fb1e MKL |
1276 | if (!__rt6_check_expired(rt) && |
1277 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
3da59bd9 MKL |
1278 | rt6_check((struct rt6_info *)(rt->dst.from), cookie)) |
1279 | return &rt->dst; | |
1280 | else | |
1281 | return NULL; | |
1282 | } | |
1283 | ||
1da177e4 LT |
1284 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
1285 | { | |
1286 | struct rt6_info *rt; | |
1287 | ||
1288 | rt = (struct rt6_info *) dst; | |
1289 | ||
6f3118b5 ND |
1290 | /* All IPV6 dsts are created with ->obsolete set to the value |
1291 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1292 | * into this function always. | |
1293 | */ | |
e3bc10bd | 1294 | |
4b32b5ad MKL |
1295 | rt6_dst_from_metrics_check(rt); |
1296 | ||
02bcf4e0 MKL |
1297 | if (rt->rt6i_flags & RTF_PCPU || |
1298 | (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from)) | |
3da59bd9 MKL |
1299 | return rt6_dst_from_check(rt, cookie); |
1300 | else | |
1301 | return rt6_check(rt, cookie); | |
1da177e4 LT |
1302 | } |
1303 | ||
1304 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1305 | { | |
1306 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1307 | ||
1308 | if (rt) { | |
54c1a859 YH |
1309 | if (rt->rt6i_flags & RTF_CACHE) { |
1310 | if (rt6_check_expired(rt)) { | |
1311 | ip6_del_rt(rt); | |
1312 | dst = NULL; | |
1313 | } | |
1314 | } else { | |
1da177e4 | 1315 | dst_release(dst); |
54c1a859 YH |
1316 | dst = NULL; |
1317 | } | |
1da177e4 | 1318 | } |
54c1a859 | 1319 | return dst; |
1da177e4 LT |
1320 | } |
1321 | ||
1322 | static void ip6_link_failure(struct sk_buff *skb) | |
1323 | { | |
1324 | struct rt6_info *rt; | |
1325 | ||
3ffe533c | 1326 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1327 | |
adf30907 | 1328 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1329 | if (rt) { |
1eb4f758 HFS |
1330 | if (rt->rt6i_flags & RTF_CACHE) { |
1331 | dst_hold(&rt->dst); | |
8e3d5be7 | 1332 | ip6_del_rt(rt); |
1eb4f758 | 1333 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { |
1da177e4 | 1334 | rt->rt6i_node->fn_sernum = -1; |
1eb4f758 | 1335 | } |
1da177e4 LT |
1336 | } |
1337 | } | |
1338 | ||
45e4fd26 MKL |
1339 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
1340 | { | |
1341 | struct net *net = dev_net(rt->dst.dev); | |
1342 | ||
1343 | rt->rt6i_flags |= RTF_MODIFIED; | |
1344 | rt->rt6i_pmtu = mtu; | |
1345 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
1346 | } | |
1347 | ||
0d3f6d29 MKL |
1348 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
1349 | { | |
1350 | return !(rt->rt6i_flags & RTF_CACHE) && | |
1351 | (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node); | |
1352 | } | |
1353 | ||
45e4fd26 MKL |
1354 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
1355 | const struct ipv6hdr *iph, u32 mtu) | |
1da177e4 | 1356 | { |
67ba4152 | 1357 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 1358 | |
45e4fd26 MKL |
1359 | if (rt6->rt6i_flags & RTF_LOCAL) |
1360 | return; | |
81aded24 | 1361 | |
45e4fd26 MKL |
1362 | dst_confirm(dst); |
1363 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); | |
1364 | if (mtu >= dst_mtu(dst)) | |
1365 | return; | |
9d289715 | 1366 | |
0d3f6d29 | 1367 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 MKL |
1368 | rt6_do_update_pmtu(rt6, mtu); |
1369 | } else { | |
1370 | const struct in6_addr *daddr, *saddr; | |
1371 | struct rt6_info *nrt6; | |
1372 | ||
1373 | if (iph) { | |
1374 | daddr = &iph->daddr; | |
1375 | saddr = &iph->saddr; | |
1376 | } else if (sk) { | |
1377 | daddr = &sk->sk_v6_daddr; | |
1378 | saddr = &inet6_sk(sk)->saddr; | |
1379 | } else { | |
1380 | return; | |
1381 | } | |
1382 | nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr); | |
1383 | if (nrt6) { | |
1384 | rt6_do_update_pmtu(nrt6, mtu); | |
1385 | ||
1386 | /* ip6_ins_rt(nrt6) will bump the | |
1387 | * rt6->rt6i_node->fn_sernum | |
1388 | * which will fail the next rt6_check() and | |
1389 | * invalidate the sk->sk_dst_cache. | |
1390 | */ | |
1391 | ip6_ins_rt(nrt6); | |
1392 | } | |
1da177e4 LT |
1393 | } |
1394 | } | |
1395 | ||
45e4fd26 MKL |
1396 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1397 | struct sk_buff *skb, u32 mtu) | |
1398 | { | |
1399 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu); | |
1400 | } | |
1401 | ||
42ae66c8 DM |
1402 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
1403 | int oif, u32 mark) | |
81aded24 DM |
1404 | { |
1405 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1406 | struct dst_entry *dst; | |
1407 | struct flowi6 fl6; | |
1408 | ||
1409 | memset(&fl6, 0, sizeof(fl6)); | |
1410 | fl6.flowi6_oif = oif; | |
1b3c61dc | 1411 | fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); |
81aded24 DM |
1412 | fl6.daddr = iph->daddr; |
1413 | fl6.saddr = iph->saddr; | |
6502ca52 | 1414 | fl6.flowlabel = ip6_flowinfo(iph); |
81aded24 DM |
1415 | |
1416 | dst = ip6_route_output(net, NULL, &fl6); | |
1417 | if (!dst->error) | |
45e4fd26 | 1418 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu)); |
81aded24 DM |
1419 | dst_release(dst); |
1420 | } | |
1421 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1422 | ||
1423 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1424 | { | |
33c162a9 MKL |
1425 | struct dst_entry *dst; |
1426 | ||
81aded24 DM |
1427 | ip6_update_pmtu(skb, sock_net(sk), mtu, |
1428 | sk->sk_bound_dev_if, sk->sk_mark); | |
33c162a9 MKL |
1429 | |
1430 | dst = __sk_dst_get(sk); | |
1431 | if (!dst || !dst->obsolete || | |
1432 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) | |
1433 | return; | |
1434 | ||
1435 | bh_lock_sock(sk); | |
1436 | if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
1437 | ip6_datagram_dst_update(sk, false); | |
1438 | bh_unlock_sock(sk); | |
81aded24 DM |
1439 | } |
1440 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1441 | ||
b55b76b2 DJ |
1442 | /* Handle redirects */ |
1443 | struct ip6rd_flowi { | |
1444 | struct flowi6 fl6; | |
1445 | struct in6_addr gateway; | |
1446 | }; | |
1447 | ||
1448 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
1449 | struct fib6_table *table, | |
1450 | struct flowi6 *fl6, | |
1451 | int flags) | |
1452 | { | |
1453 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
1454 | struct rt6_info *rt; | |
1455 | struct fib6_node *fn; | |
1456 | ||
1457 | /* Get the "current" route for this destination and | |
1458 | * check if the redirect has come from approriate router. | |
1459 | * | |
1460 | * RFC 4861 specifies that redirects should only be | |
1461 | * accepted if they come from the nexthop to the target. | |
1462 | * Due to the way the routes are chosen, this notion | |
1463 | * is a bit fuzzy and one might need to check all possible | |
1464 | * routes. | |
1465 | */ | |
1466 | ||
1467 | read_lock_bh(&table->tb6_lock); | |
1468 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); | |
1469 | restart: | |
1470 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { | |
1471 | if (rt6_check_expired(rt)) | |
1472 | continue; | |
1473 | if (rt->dst.error) | |
1474 | break; | |
1475 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1476 | continue; | |
1477 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) | |
1478 | continue; | |
1479 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) | |
1480 | continue; | |
1481 | break; | |
1482 | } | |
1483 | ||
1484 | if (!rt) | |
1485 | rt = net->ipv6.ip6_null_entry; | |
1486 | else if (rt->dst.error) { | |
1487 | rt = net->ipv6.ip6_null_entry; | |
b0a1ba59 MKL |
1488 | goto out; |
1489 | } | |
1490 | ||
1491 | if (rt == net->ipv6.ip6_null_entry) { | |
a3c00e46 MKL |
1492 | fn = fib6_backtrack(fn, &fl6->saddr); |
1493 | if (fn) | |
1494 | goto restart; | |
b55b76b2 | 1495 | } |
a3c00e46 | 1496 | |
b0a1ba59 | 1497 | out: |
b55b76b2 DJ |
1498 | dst_hold(&rt->dst); |
1499 | ||
1500 | read_unlock_bh(&table->tb6_lock); | |
1501 | ||
b811580d | 1502 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); |
b55b76b2 DJ |
1503 | return rt; |
1504 | }; | |
1505 | ||
1506 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
1507 | const struct flowi6 *fl6, | |
1508 | const struct in6_addr *gateway) | |
1509 | { | |
1510 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
1511 | struct ip6rd_flowi rdfl; | |
1512 | ||
1513 | rdfl.fl6 = *fl6; | |
1514 | rdfl.gateway = *gateway; | |
1515 | ||
1516 | return fib6_rule_lookup(net, &rdfl.fl6, | |
1517 | flags, __ip6_route_redirect); | |
1518 | } | |
1519 | ||
3a5ad2ee DM |
1520 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1521 | { | |
1522 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1523 | struct dst_entry *dst; | |
1524 | struct flowi6 fl6; | |
1525 | ||
1526 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1527 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
3a5ad2ee DM |
1528 | fl6.flowi6_oif = oif; |
1529 | fl6.flowi6_mark = mark; | |
3a5ad2ee DM |
1530 | fl6.daddr = iph->daddr; |
1531 | fl6.saddr = iph->saddr; | |
6502ca52 | 1532 | fl6.flowlabel = ip6_flowinfo(iph); |
3a5ad2ee | 1533 | |
b55b76b2 DJ |
1534 | dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
1535 | rt6_do_redirect(dst, NULL, skb); | |
3a5ad2ee DM |
1536 | dst_release(dst); |
1537 | } | |
1538 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1539 | ||
c92a59ec DJ |
1540 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
1541 | u32 mark) | |
1542 | { | |
1543 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1544 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
1545 | struct dst_entry *dst; | |
1546 | struct flowi6 fl6; | |
1547 | ||
1548 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1549 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
c92a59ec DJ |
1550 | fl6.flowi6_oif = oif; |
1551 | fl6.flowi6_mark = mark; | |
c92a59ec DJ |
1552 | fl6.daddr = msg->dest; |
1553 | fl6.saddr = iph->daddr; | |
1554 | ||
b55b76b2 DJ |
1555 | dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
1556 | rt6_do_redirect(dst, NULL, skb); | |
c92a59ec DJ |
1557 | dst_release(dst); |
1558 | } | |
1559 | ||
3a5ad2ee DM |
1560 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
1561 | { | |
1562 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1563 | } | |
1564 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1565 | ||
0dbaee3b | 1566 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1567 | { |
0dbaee3b DM |
1568 | struct net_device *dev = dst->dev; |
1569 | unsigned int mtu = dst_mtu(dst); | |
1570 | struct net *net = dev_net(dev); | |
1571 | ||
1da177e4 LT |
1572 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1573 | ||
5578689a DL |
1574 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1575 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1576 | |
1577 | /* | |
1ab1457c YH |
1578 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1579 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1580 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1581 | * rely only on pmtu discovery" |
1582 | */ | |
1583 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1584 | mtu = IPV6_MAXPLEN; | |
1585 | return mtu; | |
1586 | } | |
1587 | ||
ebb762f2 | 1588 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1589 | { |
4b32b5ad MKL |
1590 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
1591 | unsigned int mtu = rt->rt6i_pmtu; | |
d33e4553 | 1592 | struct inet6_dev *idev; |
618f9bc7 | 1593 | |
4b32b5ad MKL |
1594 | if (mtu) |
1595 | goto out; | |
1596 | ||
1597 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 1598 | if (mtu) |
30f78d8e | 1599 | goto out; |
618f9bc7 SK |
1600 | |
1601 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1602 | |
1603 | rcu_read_lock(); | |
1604 | idev = __in6_dev_get(dst->dev); | |
1605 | if (idev) | |
1606 | mtu = idev->cnf.mtu6; | |
1607 | rcu_read_unlock(); | |
1608 | ||
30f78d8e | 1609 | out: |
14972cbd RP |
1610 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
1611 | ||
1612 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
1613 | } |
1614 | ||
3b00944c YH |
1615 | static struct dst_entry *icmp6_dst_gc_list; |
1616 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1617 | |
3b00944c | 1618 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1619 | struct flowi6 *fl6) |
1da177e4 | 1620 | { |
87a11578 | 1621 | struct dst_entry *dst; |
1da177e4 LT |
1622 | struct rt6_info *rt; |
1623 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1624 | struct net *net = dev_net(dev); |
1da177e4 | 1625 | |
38308473 | 1626 | if (unlikely(!idev)) |
122bdf67 | 1627 | return ERR_PTR(-ENODEV); |
1da177e4 | 1628 | |
ad706862 | 1629 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 1630 | if (unlikely(!rt)) { |
1da177e4 | 1631 | in6_dev_put(idev); |
87a11578 | 1632 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1633 | goto out; |
1634 | } | |
1635 | ||
8e2ec639 YZ |
1636 | rt->dst.flags |= DST_HOST; |
1637 | rt->dst.output = ip6_output; | |
d8d1f30b | 1638 | atomic_set(&rt->dst.__refcnt, 1); |
550bab42 | 1639 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 1640 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1641 | rt->rt6i_dst.plen = 128; |
1642 | rt->rt6i_idev = idev; | |
14edd87d | 1643 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1644 | |
3b00944c | 1645 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1646 | rt->dst.next = icmp6_dst_gc_list; |
1647 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1648 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1649 | |
5578689a | 1650 | fib6_force_start_gc(net); |
1da177e4 | 1651 | |
87a11578 DM |
1652 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1653 | ||
1da177e4 | 1654 | out: |
87a11578 | 1655 | return dst; |
1da177e4 LT |
1656 | } |
1657 | ||
3d0f24a7 | 1658 | int icmp6_dst_gc(void) |
1da177e4 | 1659 | { |
e9476e95 | 1660 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1661 | int more = 0; |
1da177e4 | 1662 | |
3b00944c YH |
1663 | spin_lock_bh(&icmp6_dst_lock); |
1664 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1665 | |
1da177e4 LT |
1666 | while ((dst = *pprev) != NULL) { |
1667 | if (!atomic_read(&dst->__refcnt)) { | |
1668 | *pprev = dst->next; | |
1669 | dst_free(dst); | |
1da177e4 LT |
1670 | } else { |
1671 | pprev = &dst->next; | |
3d0f24a7 | 1672 | ++more; |
1da177e4 LT |
1673 | } |
1674 | } | |
1675 | ||
3b00944c | 1676 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1677 | |
3d0f24a7 | 1678 | return more; |
1da177e4 LT |
1679 | } |
1680 | ||
1e493d19 DM |
1681 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1682 | void *arg) | |
1683 | { | |
1684 | struct dst_entry *dst, **pprev; | |
1685 | ||
1686 | spin_lock_bh(&icmp6_dst_lock); | |
1687 | pprev = &icmp6_dst_gc_list; | |
1688 | while ((dst = *pprev) != NULL) { | |
1689 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1690 | if (func(rt, arg)) { | |
1691 | *pprev = dst->next; | |
1692 | dst_free(dst); | |
1693 | } else { | |
1694 | pprev = &dst->next; | |
1695 | } | |
1696 | } | |
1697 | spin_unlock_bh(&icmp6_dst_lock); | |
1698 | } | |
1699 | ||
569d3645 | 1700 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1701 | { |
86393e52 | 1702 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1703 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1704 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1705 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1706 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1707 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1708 | int entries; |
7019b78e | 1709 | |
fc66f95c | 1710 | entries = dst_entries_get_fast(ops); |
49a18d86 | 1711 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 1712 | entries <= rt_max_size) |
1da177e4 LT |
1713 | goto out; |
1714 | ||
6891a346 | 1715 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 1716 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
1717 | entries = dst_entries_get_slow(ops); |
1718 | if (entries < ops->gc_thresh) | |
7019b78e | 1719 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1720 | out: |
7019b78e | 1721 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1722 | return entries > rt_max_size; |
1da177e4 LT |
1723 | } |
1724 | ||
e715b6d3 FW |
1725 | static int ip6_convert_metrics(struct mx6_config *mxc, |
1726 | const struct fib6_config *cfg) | |
1727 | { | |
c3a8d947 | 1728 | bool ecn_ca = false; |
e715b6d3 FW |
1729 | struct nlattr *nla; |
1730 | int remaining; | |
1731 | u32 *mp; | |
1732 | ||
63159f29 | 1733 | if (!cfg->fc_mx) |
e715b6d3 FW |
1734 | return 0; |
1735 | ||
1736 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1737 | if (unlikely(!mp)) | |
1738 | return -ENOMEM; | |
1739 | ||
1740 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1741 | int type = nla_type(nla); | |
1bb14807 | 1742 | u32 val; |
e715b6d3 | 1743 | |
1bb14807 DB |
1744 | if (!type) |
1745 | continue; | |
1746 | if (unlikely(type > RTAX_MAX)) | |
1747 | goto err; | |
ea697639 | 1748 | |
1bb14807 DB |
1749 | if (type == RTAX_CC_ALGO) { |
1750 | char tmp[TCP_CA_NAME_MAX]; | |
e715b6d3 | 1751 | |
1bb14807 | 1752 | nla_strlcpy(tmp, nla, sizeof(tmp)); |
c3a8d947 | 1753 | val = tcp_ca_get_key_by_name(tmp, &ecn_ca); |
1bb14807 DB |
1754 | if (val == TCP_CA_UNSPEC) |
1755 | goto err; | |
1756 | } else { | |
1757 | val = nla_get_u32(nla); | |
e715b6d3 | 1758 | } |
626abd59 PA |
1759 | if (type == RTAX_HOPLIMIT && val > 255) |
1760 | val = 255; | |
b8d3e416 DB |
1761 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
1762 | goto err; | |
1bb14807 DB |
1763 | |
1764 | mp[type - 1] = val; | |
1765 | __set_bit(type - 1, mxc->mx_valid); | |
e715b6d3 FW |
1766 | } |
1767 | ||
c3a8d947 DB |
1768 | if (ecn_ca) { |
1769 | __set_bit(RTAX_FEATURES - 1, mxc->mx_valid); | |
1770 | mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; | |
1771 | } | |
e715b6d3 | 1772 | |
c3a8d947 | 1773 | mxc->mx = mp; |
e715b6d3 FW |
1774 | return 0; |
1775 | err: | |
1776 | kfree(mp); | |
1777 | return -EINVAL; | |
1778 | } | |
1da177e4 | 1779 | |
8c14586f DA |
1780 | static struct rt6_info *ip6_nh_lookup_table(struct net *net, |
1781 | struct fib6_config *cfg, | |
1782 | const struct in6_addr *gw_addr) | |
1783 | { | |
1784 | struct flowi6 fl6 = { | |
1785 | .flowi6_oif = cfg->fc_ifindex, | |
1786 | .daddr = *gw_addr, | |
1787 | .saddr = cfg->fc_prefsrc, | |
1788 | }; | |
1789 | struct fib6_table *table; | |
1790 | struct rt6_info *rt; | |
48f1dcb5 | 1791 | int flags = RT6_LOOKUP_F_IFACE; |
8c14586f DA |
1792 | |
1793 | table = fib6_get_table(net, cfg->fc_table); | |
1794 | if (!table) | |
1795 | return NULL; | |
1796 | ||
1797 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) | |
1798 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1799 | ||
1800 | rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags); | |
1801 | ||
1802 | /* if table lookup failed, fall back to full lookup */ | |
1803 | if (rt == net->ipv6.ip6_null_entry) { | |
1804 | ip6_rt_put(rt); | |
1805 | rt = NULL; | |
1806 | } | |
1807 | ||
1808 | return rt; | |
1809 | } | |
1810 | ||
8c5b83f0 | 1811 | static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg) |
1da177e4 | 1812 | { |
5578689a | 1813 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1814 | struct rt6_info *rt = NULL; |
1815 | struct net_device *dev = NULL; | |
1816 | struct inet6_dev *idev = NULL; | |
c71099ac | 1817 | struct fib6_table *table; |
1da177e4 | 1818 | int addr_type; |
8c5b83f0 | 1819 | int err = -EINVAL; |
1da177e4 | 1820 | |
86872cb5 | 1821 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
8c5b83f0 | 1822 | goto out; |
1da177e4 | 1823 | #ifndef CONFIG_IPV6_SUBTREES |
86872cb5 | 1824 | if (cfg->fc_src_len) |
8c5b83f0 | 1825 | goto out; |
1da177e4 | 1826 | #endif |
86872cb5 | 1827 | if (cfg->fc_ifindex) { |
1da177e4 | 1828 | err = -ENODEV; |
5578689a | 1829 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1830 | if (!dev) |
1831 | goto out; | |
1832 | idev = in6_dev_get(dev); | |
1833 | if (!idev) | |
1834 | goto out; | |
1835 | } | |
1836 | ||
86872cb5 TG |
1837 | if (cfg->fc_metric == 0) |
1838 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1839 | |
d71314b4 | 1840 | err = -ENOBUFS; |
38308473 DM |
1841 | if (cfg->fc_nlinfo.nlh && |
1842 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1843 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1844 | if (!table) { |
f3213831 | 1845 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1846 | table = fib6_new_table(net, cfg->fc_table); |
1847 | } | |
1848 | } else { | |
1849 | table = fib6_new_table(net, cfg->fc_table); | |
1850 | } | |
38308473 DM |
1851 | |
1852 | if (!table) | |
c71099ac | 1853 | goto out; |
c71099ac | 1854 | |
ad706862 MKL |
1855 | rt = ip6_dst_alloc(net, NULL, |
1856 | (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT); | |
1da177e4 | 1857 | |
38308473 | 1858 | if (!rt) { |
1da177e4 LT |
1859 | err = -ENOMEM; |
1860 | goto out; | |
1861 | } | |
1862 | ||
1716a961 G |
1863 | if (cfg->fc_flags & RTF_EXPIRES) |
1864 | rt6_set_expires(rt, jiffies + | |
1865 | clock_t_to_jiffies(cfg->fc_expires)); | |
1866 | else | |
1867 | rt6_clean_expires(rt); | |
1da177e4 | 1868 | |
86872cb5 TG |
1869 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1870 | cfg->fc_protocol = RTPROT_BOOT; | |
1871 | rt->rt6i_protocol = cfg->fc_protocol; | |
1872 | ||
1873 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1874 | |
1875 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1876 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1877 | else if (cfg->fc_flags & RTF_LOCAL) |
1878 | rt->dst.input = ip6_input; | |
1da177e4 | 1879 | else |
d8d1f30b | 1880 | rt->dst.input = ip6_forward; |
1da177e4 | 1881 | |
d8d1f30b | 1882 | rt->dst.output = ip6_output; |
1da177e4 | 1883 | |
19e42e45 RP |
1884 | if (cfg->fc_encap) { |
1885 | struct lwtunnel_state *lwtstate; | |
1886 | ||
1887 | err = lwtunnel_build_state(dev, cfg->fc_encap_type, | |
127eb7cd TH |
1888 | cfg->fc_encap, AF_INET6, cfg, |
1889 | &lwtstate); | |
19e42e45 RP |
1890 | if (err) |
1891 | goto out; | |
61adedf3 JB |
1892 | rt->dst.lwtstate = lwtstate_get(lwtstate); |
1893 | if (lwtunnel_output_redirect(rt->dst.lwtstate)) { | |
1894 | rt->dst.lwtstate->orig_output = rt->dst.output; | |
1895 | rt->dst.output = lwtunnel_output; | |
25368623 | 1896 | } |
61adedf3 JB |
1897 | if (lwtunnel_input_redirect(rt->dst.lwtstate)) { |
1898 | rt->dst.lwtstate->orig_input = rt->dst.input; | |
1899 | rt->dst.input = lwtunnel_input; | |
25368623 | 1900 | } |
19e42e45 RP |
1901 | } |
1902 | ||
86872cb5 TG |
1903 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1904 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
afc4eef8 | 1905 | if (rt->rt6i_dst.plen == 128) |
e5fd387a | 1906 | rt->dst.flags |= DST_HOST; |
e5fd387a | 1907 | |
1da177e4 | 1908 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1909 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1910 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1911 | #endif |
1912 | ||
86872cb5 | 1913 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1914 | |
1915 | /* We cannot add true routes via loopback here, | |
1916 | they would result in kernel looping; promote them to reject routes | |
1917 | */ | |
86872cb5 | 1918 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1919 | (dev && (dev->flags & IFF_LOOPBACK) && |
1920 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1921 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1922 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1923 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1924 | if (dev) { |
1925 | dev_put(dev); | |
1926 | in6_dev_put(idev); | |
1927 | } | |
5578689a | 1928 | dev = net->loopback_dev; |
1da177e4 LT |
1929 | dev_hold(dev); |
1930 | idev = in6_dev_get(dev); | |
1931 | if (!idev) { | |
1932 | err = -ENODEV; | |
1933 | goto out; | |
1934 | } | |
1935 | } | |
1da177e4 | 1936 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1937 | switch (cfg->fc_type) { |
1938 | case RTN_BLACKHOLE: | |
1939 | rt->dst.error = -EINVAL; | |
ede2059d | 1940 | rt->dst.output = dst_discard_out; |
7150aede | 1941 | rt->dst.input = dst_discard; |
ef2c7d7b ND |
1942 | break; |
1943 | case RTN_PROHIBIT: | |
1944 | rt->dst.error = -EACCES; | |
7150aede K |
1945 | rt->dst.output = ip6_pkt_prohibit_out; |
1946 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 1947 | break; |
b4949ab2 | 1948 | case RTN_THROW: |
0315e382 | 1949 | case RTN_UNREACHABLE: |
ef2c7d7b | 1950 | default: |
7150aede | 1951 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
0315e382 NF |
1952 | : (cfg->fc_type == RTN_UNREACHABLE) |
1953 | ? -EHOSTUNREACH : -ENETUNREACH; | |
7150aede K |
1954 | rt->dst.output = ip6_pkt_discard_out; |
1955 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
1956 | break; |
1957 | } | |
1da177e4 LT |
1958 | goto install_route; |
1959 | } | |
1960 | ||
86872cb5 | 1961 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1962 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1963 | int gwa_type; |
1964 | ||
86872cb5 | 1965 | gw_addr = &cfg->fc_gateway; |
330567b7 | 1966 | gwa_type = ipv6_addr_type(gw_addr); |
48ed7b26 FW |
1967 | |
1968 | /* if gw_addr is local we will fail to detect this in case | |
1969 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
1970 | * will return already-added prefix route via interface that | |
1971 | * prefix route was assigned to, which might be non-loopback. | |
1972 | */ | |
1973 | err = -EINVAL; | |
330567b7 FW |
1974 | if (ipv6_chk_addr_and_flags(net, gw_addr, |
1975 | gwa_type & IPV6_ADDR_LINKLOCAL ? | |
1976 | dev : NULL, 0, 0)) | |
48ed7b26 FW |
1977 | goto out; |
1978 | ||
4e3fd7a0 | 1979 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1980 | |
1981 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
8c14586f | 1982 | struct rt6_info *grt = NULL; |
1da177e4 LT |
1983 | |
1984 | /* IPv6 strictly inhibits using not link-local | |
1985 | addresses as nexthop address. | |
1986 | Otherwise, router will not able to send redirects. | |
1987 | It is very good, but in some (rare!) circumstances | |
1988 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1989 | some exceptions. --ANK | |
1990 | */ | |
38308473 | 1991 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1992 | goto out; |
1993 | ||
8c14586f DA |
1994 | if (cfg->fc_table) |
1995 | grt = ip6_nh_lookup_table(net, cfg, gw_addr); | |
1996 | ||
1997 | if (!grt) | |
1998 | grt = rt6_lookup(net, gw_addr, NULL, | |
1999 | cfg->fc_ifindex, 1); | |
1da177e4 LT |
2000 | |
2001 | err = -EHOSTUNREACH; | |
38308473 | 2002 | if (!grt) |
1da177e4 LT |
2003 | goto out; |
2004 | if (dev) { | |
d1918542 | 2005 | if (dev != grt->dst.dev) { |
94e187c0 | 2006 | ip6_rt_put(grt); |
1da177e4 LT |
2007 | goto out; |
2008 | } | |
2009 | } else { | |
d1918542 | 2010 | dev = grt->dst.dev; |
1da177e4 LT |
2011 | idev = grt->rt6i_idev; |
2012 | dev_hold(dev); | |
2013 | in6_dev_hold(grt->rt6i_idev); | |
2014 | } | |
38308473 | 2015 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 2016 | err = 0; |
94e187c0 | 2017 | ip6_rt_put(grt); |
1da177e4 LT |
2018 | |
2019 | if (err) | |
2020 | goto out; | |
2021 | } | |
2022 | err = -EINVAL; | |
38308473 | 2023 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2024 | goto out; |
2025 | } | |
2026 | ||
2027 | err = -ENODEV; | |
38308473 | 2028 | if (!dev) |
1da177e4 LT |
2029 | goto out; |
2030 | ||
c3968a85 DW |
2031 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
2032 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
2033 | err = -EINVAL; | |
2034 | goto out; | |
2035 | } | |
4e3fd7a0 | 2036 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
2037 | rt->rt6i_prefsrc.plen = 128; |
2038 | } else | |
2039 | rt->rt6i_prefsrc.plen = 0; | |
2040 | ||
86872cb5 | 2041 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
2042 | |
2043 | install_route: | |
d8d1f30b | 2044 | rt->dst.dev = dev; |
1da177e4 | 2045 | rt->rt6i_idev = idev; |
c71099ac | 2046 | rt->rt6i_table = table; |
63152fc0 | 2047 | |
c346dca1 | 2048 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 2049 | |
8c5b83f0 | 2050 | return rt; |
6b9ea5a6 RP |
2051 | out: |
2052 | if (dev) | |
2053 | dev_put(dev); | |
2054 | if (idev) | |
2055 | in6_dev_put(idev); | |
2056 | if (rt) | |
2057 | dst_free(&rt->dst); | |
2058 | ||
8c5b83f0 | 2059 | return ERR_PTR(err); |
6b9ea5a6 RP |
2060 | } |
2061 | ||
2062 | int ip6_route_add(struct fib6_config *cfg) | |
2063 | { | |
2064 | struct mx6_config mxc = { .mx = NULL, }; | |
8c5b83f0 | 2065 | struct rt6_info *rt; |
6b9ea5a6 RP |
2066 | int err; |
2067 | ||
8c5b83f0 RP |
2068 | rt = ip6_route_info_create(cfg); |
2069 | if (IS_ERR(rt)) { | |
2070 | err = PTR_ERR(rt); | |
2071 | rt = NULL; | |
6b9ea5a6 | 2072 | goto out; |
8c5b83f0 | 2073 | } |
6b9ea5a6 | 2074 | |
e715b6d3 FW |
2075 | err = ip6_convert_metrics(&mxc, cfg); |
2076 | if (err) | |
2077 | goto out; | |
1da177e4 | 2078 | |
e715b6d3 FW |
2079 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc); |
2080 | ||
2081 | kfree(mxc.mx); | |
6b9ea5a6 | 2082 | |
e715b6d3 | 2083 | return err; |
1da177e4 | 2084 | out: |
1da177e4 | 2085 | if (rt) |
d8d1f30b | 2086 | dst_free(&rt->dst); |
6b9ea5a6 | 2087 | |
1da177e4 LT |
2088 | return err; |
2089 | } | |
2090 | ||
86872cb5 | 2091 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2092 | { |
2093 | int err; | |
c71099ac | 2094 | struct fib6_table *table; |
d1918542 | 2095 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 2096 | |
8e3d5be7 MKL |
2097 | if (rt == net->ipv6.ip6_null_entry || |
2098 | rt->dst.flags & DST_NOCACHE) { | |
6825a26c G |
2099 | err = -ENOENT; |
2100 | goto out; | |
2101 | } | |
6c813a72 | 2102 | |
c71099ac TG |
2103 | table = rt->rt6i_table; |
2104 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 2105 | err = fib6_del(rt, info); |
c71099ac | 2106 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 2107 | |
6825a26c | 2108 | out: |
94e187c0 | 2109 | ip6_rt_put(rt); |
1da177e4 LT |
2110 | return err; |
2111 | } | |
2112 | ||
e0a1ad73 TG |
2113 | int ip6_del_rt(struct rt6_info *rt) |
2114 | { | |
4d1169c1 | 2115 | struct nl_info info = { |
d1918542 | 2116 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 2117 | }; |
528c4ceb | 2118 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
2119 | } |
2120 | ||
86872cb5 | 2121 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 2122 | { |
c71099ac | 2123 | struct fib6_table *table; |
1da177e4 LT |
2124 | struct fib6_node *fn; |
2125 | struct rt6_info *rt; | |
2126 | int err = -ESRCH; | |
2127 | ||
5578689a | 2128 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 2129 | if (!table) |
c71099ac TG |
2130 | return err; |
2131 | ||
2132 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 2133 | |
c71099ac | 2134 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
2135 | &cfg->fc_dst, cfg->fc_dst_len, |
2136 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 2137 | |
1da177e4 | 2138 | if (fn) { |
d8d1f30b | 2139 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
1f56a01f MKL |
2140 | if ((rt->rt6i_flags & RTF_CACHE) && |
2141 | !(cfg->fc_flags & RTF_CACHE)) | |
2142 | continue; | |
86872cb5 | 2143 | if (cfg->fc_ifindex && |
d1918542 DM |
2144 | (!rt->dst.dev || |
2145 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 2146 | continue; |
86872cb5 TG |
2147 | if (cfg->fc_flags & RTF_GATEWAY && |
2148 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 2149 | continue; |
86872cb5 | 2150 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 2151 | continue; |
d8d1f30b | 2152 | dst_hold(&rt->dst); |
c71099ac | 2153 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 2154 | |
86872cb5 | 2155 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
2156 | } |
2157 | } | |
c71099ac | 2158 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2159 | |
2160 | return err; | |
2161 | } | |
2162 | ||
6700c270 | 2163 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 2164 | { |
a6279458 | 2165 | struct netevent_redirect netevent; |
e8599ff4 | 2166 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
2167 | struct ndisc_options ndopts; |
2168 | struct inet6_dev *in6_dev; | |
2169 | struct neighbour *neigh; | |
71bcdba0 | 2170 | struct rd_msg *msg; |
6e157b6a DM |
2171 | int optlen, on_link; |
2172 | u8 *lladdr; | |
e8599ff4 | 2173 | |
29a3cad5 | 2174 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 2175 | optlen -= sizeof(*msg); |
e8599ff4 DM |
2176 | |
2177 | if (optlen < 0) { | |
6e157b6a | 2178 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
2179 | return; |
2180 | } | |
2181 | ||
71bcdba0 | 2182 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 2183 | |
71bcdba0 | 2184 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 2185 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
2186 | return; |
2187 | } | |
2188 | ||
6e157b6a | 2189 | on_link = 0; |
71bcdba0 | 2190 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 2191 | on_link = 1; |
71bcdba0 | 2192 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 2193 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 2194 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
2195 | return; |
2196 | } | |
2197 | ||
2198 | in6_dev = __in6_dev_get(skb->dev); | |
2199 | if (!in6_dev) | |
2200 | return; | |
2201 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
2202 | return; | |
2203 | ||
2204 | /* RFC2461 8.1: | |
2205 | * The IP source address of the Redirect MUST be the same as the current | |
2206 | * first-hop router for the specified ICMP Destination Address. | |
2207 | */ | |
2208 | ||
f997c55c | 2209 | if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
2210 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
2211 | return; | |
2212 | } | |
6e157b6a DM |
2213 | |
2214 | lladdr = NULL; | |
e8599ff4 DM |
2215 | if (ndopts.nd_opts_tgt_lladdr) { |
2216 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
2217 | skb->dev); | |
2218 | if (!lladdr) { | |
2219 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
2220 | return; | |
2221 | } | |
2222 | } | |
2223 | ||
6e157b6a | 2224 | rt = (struct rt6_info *) dst; |
ec13ad1d | 2225 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 2226 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 2227 | return; |
6e157b6a | 2228 | } |
e8599ff4 | 2229 | |
6e157b6a DM |
2230 | /* Redirect received -> path was valid. |
2231 | * Look, redirects are sent only in response to data packets, | |
2232 | * so that this nexthop apparently is reachable. --ANK | |
2233 | */ | |
2234 | dst_confirm(&rt->dst); | |
a6279458 | 2235 | |
71bcdba0 | 2236 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
2237 | if (!neigh) |
2238 | return; | |
a6279458 | 2239 | |
1da177e4 LT |
2240 | /* |
2241 | * We have finally decided to accept it. | |
2242 | */ | |
2243 | ||
f997c55c | 2244 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
2245 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
2246 | NEIGH_UPDATE_F_OVERRIDE| | |
2247 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
2248 | NEIGH_UPDATE_F_ISROUTER)), |
2249 | NDISC_REDIRECT, &ndopts); | |
1da177e4 | 2250 | |
83a09abd | 2251 | nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL); |
38308473 | 2252 | if (!nrt) |
1da177e4 LT |
2253 | goto out; |
2254 | ||
2255 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
2256 | if (on_link) | |
2257 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
2258 | ||
4e3fd7a0 | 2259 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 2260 | |
40e22e8f | 2261 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
2262 | goto out; |
2263 | ||
d8d1f30b CG |
2264 | netevent.old = &rt->dst; |
2265 | netevent.new = &nrt->dst; | |
71bcdba0 | 2266 | netevent.daddr = &msg->dest; |
60592833 | 2267 | netevent.neigh = neigh; |
8d71740c TT |
2268 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
2269 | ||
38308473 | 2270 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 2271 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 2272 | ip6_del_rt(rt); |
1da177e4 LT |
2273 | } |
2274 | ||
2275 | out: | |
e8599ff4 | 2276 | neigh_release(neigh); |
6e157b6a DM |
2277 | } |
2278 | ||
1da177e4 LT |
2279 | /* |
2280 | * Misc support functions | |
2281 | */ | |
2282 | ||
4b32b5ad MKL |
2283 | static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) |
2284 | { | |
2285 | BUG_ON(from->dst.from); | |
2286 | ||
2287 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
2288 | dst_hold(&from->dst); | |
2289 | rt->dst.from = &from->dst; | |
2290 | dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true); | |
2291 | } | |
2292 | ||
83a09abd MKL |
2293 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort) |
2294 | { | |
2295 | rt->dst.input = ort->dst.input; | |
2296 | rt->dst.output = ort->dst.output; | |
2297 | rt->rt6i_dst = ort->rt6i_dst; | |
2298 | rt->dst.error = ort->dst.error; | |
2299 | rt->rt6i_idev = ort->rt6i_idev; | |
2300 | if (rt->rt6i_idev) | |
2301 | in6_dev_hold(rt->rt6i_idev); | |
2302 | rt->dst.lastuse = jiffies; | |
2303 | rt->rt6i_gateway = ort->rt6i_gateway; | |
2304 | rt->rt6i_flags = ort->rt6i_flags; | |
2305 | rt6_set_from(rt, ort); | |
2306 | rt->rt6i_metric = ort->rt6i_metric; | |
1da177e4 | 2307 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd | 2308 | rt->rt6i_src = ort->rt6i_src; |
1da177e4 | 2309 | #endif |
83a09abd MKL |
2310 | rt->rt6i_prefsrc = ort->rt6i_prefsrc; |
2311 | rt->rt6i_table = ort->rt6i_table; | |
61adedf3 | 2312 | rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate); |
1da177e4 LT |
2313 | } |
2314 | ||
70ceb4f5 | 2315 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 2316 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
2317 | const struct in6_addr *prefix, int prefixlen, |
2318 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
2319 | { |
2320 | struct fib6_node *fn; | |
2321 | struct rt6_info *rt = NULL; | |
c71099ac TG |
2322 | struct fib6_table *table; |
2323 | ||
efa2cea0 | 2324 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 2325 | if (!table) |
c71099ac | 2326 | return NULL; |
70ceb4f5 | 2327 | |
5744dd9b | 2328 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2329 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0); |
70ceb4f5 YH |
2330 | if (!fn) |
2331 | goto out; | |
2332 | ||
d8d1f30b | 2333 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2334 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
2335 | continue; |
2336 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
2337 | continue; | |
2338 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
2339 | continue; | |
d8d1f30b | 2340 | dst_hold(&rt->dst); |
70ceb4f5 YH |
2341 | break; |
2342 | } | |
2343 | out: | |
5744dd9b | 2344 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
2345 | return rt; |
2346 | } | |
2347 | ||
efa2cea0 | 2348 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
2349 | const struct in6_addr *prefix, int prefixlen, |
2350 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 2351 | unsigned int pref) |
70ceb4f5 | 2352 | { |
86872cb5 | 2353 | struct fib6_config cfg = { |
238fc7ea | 2354 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2355 | .fc_ifindex = ifindex, |
2356 | .fc_dst_len = prefixlen, | |
2357 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
2358 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 2359 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
2360 | .fc_nlinfo.nlh = NULL, |
2361 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
2362 | }; |
2363 | ||
ca254490 | 2364 | cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO; |
4e3fd7a0 AD |
2365 | cfg.fc_dst = *prefix; |
2366 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 2367 | |
e317da96 YH |
2368 | /* We should treat it as a default route if prefix length is 0. */ |
2369 | if (!prefixlen) | |
86872cb5 | 2370 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 2371 | |
86872cb5 | 2372 | ip6_route_add(&cfg); |
70ceb4f5 | 2373 | |
efa2cea0 | 2374 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
2375 | } |
2376 | #endif | |
2377 | ||
b71d1d42 | 2378 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 2379 | { |
1da177e4 | 2380 | struct rt6_info *rt; |
c71099ac | 2381 | struct fib6_table *table; |
1da177e4 | 2382 | |
c346dca1 | 2383 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 2384 | if (!table) |
c71099ac | 2385 | return NULL; |
1da177e4 | 2386 | |
5744dd9b | 2387 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2388 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2389 | if (dev == rt->dst.dev && |
045927ff | 2390 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
2391 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
2392 | break; | |
2393 | } | |
2394 | if (rt) | |
d8d1f30b | 2395 | dst_hold(&rt->dst); |
5744dd9b | 2396 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2397 | return rt; |
2398 | } | |
2399 | ||
b71d1d42 | 2400 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
2401 | struct net_device *dev, |
2402 | unsigned int pref) | |
1da177e4 | 2403 | { |
86872cb5 | 2404 | struct fib6_config cfg = { |
ca254490 | 2405 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
238fc7ea | 2406 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2407 | .fc_ifindex = dev->ifindex, |
2408 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
2409 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 2410 | .fc_nlinfo.portid = 0, |
5578689a | 2411 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 2412 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 2413 | }; |
1da177e4 | 2414 | |
4e3fd7a0 | 2415 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 2416 | |
86872cb5 | 2417 | ip6_route_add(&cfg); |
1da177e4 | 2418 | |
1da177e4 LT |
2419 | return rt6_get_dflt_router(gwaddr, dev); |
2420 | } | |
2421 | ||
7b4da532 | 2422 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
2423 | { |
2424 | struct rt6_info *rt; | |
c71099ac TG |
2425 | struct fib6_table *table; |
2426 | ||
2427 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 2428 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 2429 | if (!table) |
c71099ac | 2430 | return; |
1da177e4 LT |
2431 | |
2432 | restart: | |
c71099ac | 2433 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 2434 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
3e8b0ac3 LC |
2435 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
2436 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d8d1f30b | 2437 | dst_hold(&rt->dst); |
c71099ac | 2438 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 2439 | ip6_del_rt(rt); |
1da177e4 LT |
2440 | goto restart; |
2441 | } | |
2442 | } | |
c71099ac | 2443 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2444 | } |
2445 | ||
5578689a DL |
2446 | static void rtmsg_to_fib6_config(struct net *net, |
2447 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
2448 | struct fib6_config *cfg) |
2449 | { | |
2450 | memset(cfg, 0, sizeof(*cfg)); | |
2451 | ||
ca254490 DA |
2452 | cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? |
2453 | : RT6_TABLE_MAIN; | |
86872cb5 TG |
2454 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; |
2455 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
2456 | cfg->fc_expires = rtmsg->rtmsg_info; | |
2457 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
2458 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
2459 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
2460 | ||
5578689a | 2461 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 2462 | |
4e3fd7a0 AD |
2463 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2464 | cfg->fc_src = rtmsg->rtmsg_src; | |
2465 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2466 | } |
2467 | ||
5578689a | 2468 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2469 | { |
86872cb5 | 2470 | struct fib6_config cfg; |
1da177e4 LT |
2471 | struct in6_rtmsg rtmsg; |
2472 | int err; | |
2473 | ||
67ba4152 | 2474 | switch (cmd) { |
1da177e4 LT |
2475 | case SIOCADDRT: /* Add a route */ |
2476 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 2477 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2478 | return -EPERM; |
2479 | err = copy_from_user(&rtmsg, arg, | |
2480 | sizeof(struct in6_rtmsg)); | |
2481 | if (err) | |
2482 | return -EFAULT; | |
86872cb5 | 2483 | |
5578689a | 2484 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2485 | |
1da177e4 LT |
2486 | rtnl_lock(); |
2487 | switch (cmd) { | |
2488 | case SIOCADDRT: | |
86872cb5 | 2489 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2490 | break; |
2491 | case SIOCDELRT: | |
86872cb5 | 2492 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2493 | break; |
2494 | default: | |
2495 | err = -EINVAL; | |
2496 | } | |
2497 | rtnl_unlock(); | |
2498 | ||
2499 | return err; | |
3ff50b79 | 2500 | } |
1da177e4 LT |
2501 | |
2502 | return -EINVAL; | |
2503 | } | |
2504 | ||
2505 | /* | |
2506 | * Drop the packet on the floor | |
2507 | */ | |
2508 | ||
d5fdd6ba | 2509 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2510 | { |
612f09e8 | 2511 | int type; |
adf30907 | 2512 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2513 | switch (ipstats_mib_noroutes) { |
2514 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2515 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2516 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2517 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2518 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2519 | break; |
2520 | } | |
2521 | /* FALLTHROUGH */ | |
2522 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2523 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2524 | ipstats_mib_noroutes); | |
612f09e8 YH |
2525 | break; |
2526 | } | |
3ffe533c | 2527 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2528 | kfree_skb(skb); |
2529 | return 0; | |
2530 | } | |
2531 | ||
9ce8ade0 TG |
2532 | static int ip6_pkt_discard(struct sk_buff *skb) |
2533 | { | |
612f09e8 | 2534 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2535 | } |
2536 | ||
ede2059d | 2537 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 2538 | { |
adf30907 | 2539 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2540 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2541 | } |
2542 | ||
9ce8ade0 TG |
2543 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2544 | { | |
612f09e8 | 2545 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2546 | } |
2547 | ||
ede2059d | 2548 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 2549 | { |
adf30907 | 2550 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2551 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2552 | } |
2553 | ||
1da177e4 LT |
2554 | /* |
2555 | * Allocate a dst for local (unicast / anycast) address. | |
2556 | */ | |
2557 | ||
2558 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2559 | const struct in6_addr *addr, | |
8f031519 | 2560 | bool anycast) |
1da177e4 | 2561 | { |
ca254490 | 2562 | u32 tb_id; |
c346dca1 | 2563 | struct net *net = dev_net(idev->dev); |
5f02ce24 DA |
2564 | struct net_device *dev = net->loopback_dev; |
2565 | struct rt6_info *rt; | |
2566 | ||
2567 | /* use L3 Master device as loopback for host routes if device | |
2568 | * is enslaved and address is not link local or multicast | |
2569 | */ | |
2570 | if (!rt6_need_strict(addr)) | |
2571 | dev = l3mdev_master_dev_rcu(idev->dev) ? : dev; | |
2572 | ||
2573 | rt = ip6_dst_alloc(net, dev, DST_NOCOUNT); | |
a3300ef4 | 2574 | if (!rt) |
1da177e4 LT |
2575 | return ERR_PTR(-ENOMEM); |
2576 | ||
1da177e4 LT |
2577 | in6_dev_hold(idev); |
2578 | ||
11d53b49 | 2579 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2580 | rt->dst.input = ip6_input; |
2581 | rt->dst.output = ip6_output; | |
1da177e4 | 2582 | rt->rt6i_idev = idev; |
1da177e4 LT |
2583 | |
2584 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2585 | if (anycast) |
2586 | rt->rt6i_flags |= RTF_ANYCAST; | |
2587 | else | |
1da177e4 | 2588 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2589 | |
550bab42 | 2590 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 2591 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2592 | rt->rt6i_dst.plen = 128; |
ca254490 DA |
2593 | tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL; |
2594 | rt->rt6i_table = fib6_get_table(net, tb_id); | |
8e3d5be7 | 2595 | rt->dst.flags |= DST_NOCACHE; |
1da177e4 | 2596 | |
d8d1f30b | 2597 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2598 | |
2599 | return rt; | |
2600 | } | |
2601 | ||
c3968a85 DW |
2602 | /* remove deleted ip from prefsrc entries */ |
2603 | struct arg_dev_net_ip { | |
2604 | struct net_device *dev; | |
2605 | struct net *net; | |
2606 | struct in6_addr *addr; | |
2607 | }; | |
2608 | ||
2609 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2610 | { | |
2611 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2612 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2613 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2614 | ||
d1918542 | 2615 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2616 | rt != net->ipv6.ip6_null_entry && |
2617 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2618 | /* remove prefsrc entry */ | |
2619 | rt->rt6i_prefsrc.plen = 0; | |
2620 | } | |
2621 | return 0; | |
2622 | } | |
2623 | ||
2624 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2625 | { | |
2626 | struct net *net = dev_net(ifp->idev->dev); | |
2627 | struct arg_dev_net_ip adni = { | |
2628 | .dev = ifp->idev->dev, | |
2629 | .net = net, | |
2630 | .addr = &ifp->addr, | |
2631 | }; | |
0c3584d5 | 2632 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
2633 | } |
2634 | ||
be7a010d DJ |
2635 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) |
2636 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) | |
2637 | ||
2638 | /* Remove routers and update dst entries when gateway turn into host. */ | |
2639 | static int fib6_clean_tohost(struct rt6_info *rt, void *arg) | |
2640 | { | |
2641 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
2642 | ||
2643 | if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) || | |
2644 | ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) && | |
2645 | ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { | |
2646 | return -1; | |
2647 | } | |
2648 | return 0; | |
2649 | } | |
2650 | ||
2651 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
2652 | { | |
2653 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
2654 | } | |
2655 | ||
8ed67789 DL |
2656 | struct arg_dev_net { |
2657 | struct net_device *dev; | |
2658 | struct net *net; | |
2659 | }; | |
2660 | ||
1da177e4 LT |
2661 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2662 | { | |
bc3ef660 | 2663 | const struct arg_dev_net *adn = arg; |
2664 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2665 | |
d1918542 | 2666 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2667 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2668 | return -1; |
c159d30c | 2669 | |
1da177e4 LT |
2670 | return 0; |
2671 | } | |
2672 | ||
f3db4851 | 2673 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2674 | { |
8ed67789 DL |
2675 | struct arg_dev_net adn = { |
2676 | .dev = dev, | |
2677 | .net = net, | |
2678 | }; | |
2679 | ||
0c3584d5 | 2680 | fib6_clean_all(net, fib6_ifdown, &adn); |
1e493d19 | 2681 | icmp6_clean_all(fib6_ifdown, &adn); |
e332bc67 EB |
2682 | if (dev) |
2683 | rt6_uncached_list_flush_dev(net, dev); | |
1da177e4 LT |
2684 | } |
2685 | ||
95c96174 | 2686 | struct rt6_mtu_change_arg { |
1da177e4 | 2687 | struct net_device *dev; |
95c96174 | 2688 | unsigned int mtu; |
1da177e4 LT |
2689 | }; |
2690 | ||
2691 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2692 | { | |
2693 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2694 | struct inet6_dev *idev; | |
2695 | ||
2696 | /* In IPv6 pmtu discovery is not optional, | |
2697 | so that RTAX_MTU lock cannot disable it. | |
2698 | We still use this lock to block changes | |
2699 | caused by addrconf/ndisc. | |
2700 | */ | |
2701 | ||
2702 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2703 | if (!idev) |
1da177e4 LT |
2704 | return 0; |
2705 | ||
2706 | /* For administrative MTU increase, there is no way to discover | |
2707 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2708 | Since RFC 1981 doesn't include administrative MTU increase | |
2709 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2710 | */ | |
2711 | /* | |
2712 | If new MTU is less than route PMTU, this new MTU will be the | |
2713 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2714 | decreases; if new MTU is greater than route PMTU, and the | |
2715 | old MTU is the lowest MTU in the path, update the route PMTU | |
2716 | to reflect the increase. In this case if the other nodes' MTU | |
2717 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2718 | PMTU discouvery. | |
2719 | */ | |
d1918542 | 2720 | if (rt->dst.dev == arg->dev && |
4b32b5ad MKL |
2721 | !dst_metric_locked(&rt->dst, RTAX_MTU)) { |
2722 | if (rt->rt6i_flags & RTF_CACHE) { | |
2723 | /* For RTF_CACHE with rt6i_pmtu == 0 | |
2724 | * (i.e. a redirected route), | |
2725 | * the metrics of its rt->dst.from has already | |
2726 | * been updated. | |
2727 | */ | |
2728 | if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu) | |
2729 | rt->rt6i_pmtu = arg->mtu; | |
2730 | } else if (dst_mtu(&rt->dst) >= arg->mtu || | |
2731 | (dst_mtu(&rt->dst) < arg->mtu && | |
2732 | dst_mtu(&rt->dst) == idev->cnf.mtu6)) { | |
2733 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); | |
2734 | } | |
566cfd8f | 2735 | } |
1da177e4 LT |
2736 | return 0; |
2737 | } | |
2738 | ||
95c96174 | 2739 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2740 | { |
c71099ac TG |
2741 | struct rt6_mtu_change_arg arg = { |
2742 | .dev = dev, | |
2743 | .mtu = mtu, | |
2744 | }; | |
1da177e4 | 2745 | |
0c3584d5 | 2746 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
2747 | } |
2748 | ||
ef7c79ed | 2749 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2750 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2751 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2752 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2753 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2754 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2755 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 2756 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
2757 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
2758 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 2759 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
86872cb5 TG |
2760 | }; |
2761 | ||
2762 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2763 | struct fib6_config *cfg) | |
1da177e4 | 2764 | { |
86872cb5 TG |
2765 | struct rtmsg *rtm; |
2766 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 2767 | unsigned int pref; |
86872cb5 | 2768 | int err; |
1da177e4 | 2769 | |
86872cb5 TG |
2770 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2771 | if (err < 0) | |
2772 | goto errout; | |
1da177e4 | 2773 | |
86872cb5 TG |
2774 | err = -EINVAL; |
2775 | rtm = nlmsg_data(nlh); | |
2776 | memset(cfg, 0, sizeof(*cfg)); | |
2777 | ||
2778 | cfg->fc_table = rtm->rtm_table; | |
2779 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2780 | cfg->fc_src_len = rtm->rtm_src_len; | |
2781 | cfg->fc_flags = RTF_UP; | |
2782 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2783 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2784 | |
ef2c7d7b ND |
2785 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2786 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2787 | rtm->rtm_type == RTN_PROHIBIT || |
2788 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2789 | cfg->fc_flags |= RTF_REJECT; |
2790 | ||
ab79ad14 MŻ |
2791 | if (rtm->rtm_type == RTN_LOCAL) |
2792 | cfg->fc_flags |= RTF_LOCAL; | |
2793 | ||
1f56a01f MKL |
2794 | if (rtm->rtm_flags & RTM_F_CLONED) |
2795 | cfg->fc_flags |= RTF_CACHE; | |
2796 | ||
15e47304 | 2797 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2798 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2799 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2800 | |
2801 | if (tb[RTA_GATEWAY]) { | |
67b61f6c | 2802 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 2803 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 2804 | } |
86872cb5 TG |
2805 | |
2806 | if (tb[RTA_DST]) { | |
2807 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2808 | ||
2809 | if (nla_len(tb[RTA_DST]) < plen) | |
2810 | goto errout; | |
2811 | ||
2812 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2813 | } |
86872cb5 TG |
2814 | |
2815 | if (tb[RTA_SRC]) { | |
2816 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2817 | ||
2818 | if (nla_len(tb[RTA_SRC]) < plen) | |
2819 | goto errout; | |
2820 | ||
2821 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2822 | } |
86872cb5 | 2823 | |
c3968a85 | 2824 | if (tb[RTA_PREFSRC]) |
67b61f6c | 2825 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 2826 | |
86872cb5 TG |
2827 | if (tb[RTA_OIF]) |
2828 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2829 | ||
2830 | if (tb[RTA_PRIORITY]) | |
2831 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2832 | ||
2833 | if (tb[RTA_METRICS]) { | |
2834 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2835 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2836 | } |
86872cb5 TG |
2837 | |
2838 | if (tb[RTA_TABLE]) | |
2839 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2840 | ||
51ebd318 ND |
2841 | if (tb[RTA_MULTIPATH]) { |
2842 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2843 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
2844 | } | |
2845 | ||
c78ba6d6 LR |
2846 | if (tb[RTA_PREF]) { |
2847 | pref = nla_get_u8(tb[RTA_PREF]); | |
2848 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
2849 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
2850 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
2851 | cfg->fc_flags |= RTF_PREF(pref); | |
2852 | } | |
2853 | ||
19e42e45 RP |
2854 | if (tb[RTA_ENCAP]) |
2855 | cfg->fc_encap = tb[RTA_ENCAP]; | |
2856 | ||
2857 | if (tb[RTA_ENCAP_TYPE]) | |
2858 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); | |
2859 | ||
32bc201e XL |
2860 | if (tb[RTA_EXPIRES]) { |
2861 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
2862 | ||
2863 | if (addrconf_finite_timeout(timeout)) { | |
2864 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
2865 | cfg->fc_flags |= RTF_EXPIRES; | |
2866 | } | |
2867 | } | |
2868 | ||
86872cb5 TG |
2869 | err = 0; |
2870 | errout: | |
2871 | return err; | |
1da177e4 LT |
2872 | } |
2873 | ||
6b9ea5a6 RP |
2874 | struct rt6_nh { |
2875 | struct rt6_info *rt6_info; | |
2876 | struct fib6_config r_cfg; | |
2877 | struct mx6_config mxc; | |
2878 | struct list_head next; | |
2879 | }; | |
2880 | ||
2881 | static void ip6_print_replace_route_err(struct list_head *rt6_nh_list) | |
2882 | { | |
2883 | struct rt6_nh *nh; | |
2884 | ||
2885 | list_for_each_entry(nh, rt6_nh_list, next) { | |
2886 | pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n", | |
2887 | &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway, | |
2888 | nh->r_cfg.fc_ifindex); | |
2889 | } | |
2890 | } | |
2891 | ||
2892 | static int ip6_route_info_append(struct list_head *rt6_nh_list, | |
2893 | struct rt6_info *rt, struct fib6_config *r_cfg) | |
2894 | { | |
2895 | struct rt6_nh *nh; | |
2896 | struct rt6_info *rtnh; | |
2897 | int err = -EEXIST; | |
2898 | ||
2899 | list_for_each_entry(nh, rt6_nh_list, next) { | |
2900 | /* check if rt6_info already exists */ | |
2901 | rtnh = nh->rt6_info; | |
2902 | ||
2903 | if (rtnh->dst.dev == rt->dst.dev && | |
2904 | rtnh->rt6i_idev == rt->rt6i_idev && | |
2905 | ipv6_addr_equal(&rtnh->rt6i_gateway, | |
2906 | &rt->rt6i_gateway)) | |
2907 | return err; | |
2908 | } | |
2909 | ||
2910 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
2911 | if (!nh) | |
2912 | return -ENOMEM; | |
2913 | nh->rt6_info = rt; | |
2914 | err = ip6_convert_metrics(&nh->mxc, r_cfg); | |
2915 | if (err) { | |
2916 | kfree(nh); | |
2917 | return err; | |
2918 | } | |
2919 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); | |
2920 | list_add_tail(&nh->next, rt6_nh_list); | |
2921 | ||
2922 | return 0; | |
2923 | } | |
2924 | ||
2925 | static int ip6_route_multipath_add(struct fib6_config *cfg) | |
51ebd318 ND |
2926 | { |
2927 | struct fib6_config r_cfg; | |
2928 | struct rtnexthop *rtnh; | |
6b9ea5a6 RP |
2929 | struct rt6_info *rt; |
2930 | struct rt6_nh *err_nh; | |
2931 | struct rt6_nh *nh, *nh_safe; | |
51ebd318 ND |
2932 | int remaining; |
2933 | int attrlen; | |
6b9ea5a6 RP |
2934 | int err = 1; |
2935 | int nhn = 0; | |
2936 | int replace = (cfg->fc_nlinfo.nlh && | |
2937 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
2938 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 2939 | |
35f1b4e9 | 2940 | remaining = cfg->fc_mp_len; |
51ebd318 | 2941 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 2942 | |
6b9ea5a6 RP |
2943 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
2944 | * rt6_info structs per nexthop | |
2945 | */ | |
51ebd318 ND |
2946 | while (rtnh_ok(rtnh, remaining)) { |
2947 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2948 | if (rtnh->rtnh_ifindex) | |
2949 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2950 | ||
2951 | attrlen = rtnh_attrlen(rtnh); | |
2952 | if (attrlen > 0) { | |
2953 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2954 | ||
2955 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2956 | if (nla) { | |
67b61f6c | 2957 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
2958 | r_cfg.fc_flags |= RTF_GATEWAY; |
2959 | } | |
19e42e45 RP |
2960 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
2961 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
2962 | if (nla) | |
2963 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 2964 | } |
6b9ea5a6 | 2965 | |
8c5b83f0 RP |
2966 | rt = ip6_route_info_create(&r_cfg); |
2967 | if (IS_ERR(rt)) { | |
2968 | err = PTR_ERR(rt); | |
2969 | rt = NULL; | |
6b9ea5a6 | 2970 | goto cleanup; |
8c5b83f0 | 2971 | } |
6b9ea5a6 RP |
2972 | |
2973 | err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg); | |
51ebd318 | 2974 | if (err) { |
6b9ea5a6 RP |
2975 | dst_free(&rt->dst); |
2976 | goto cleanup; | |
2977 | } | |
2978 | ||
2979 | rtnh = rtnh_next(rtnh, &remaining); | |
2980 | } | |
2981 | ||
2982 | err_nh = NULL; | |
2983 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
2984 | err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc); | |
2985 | /* nh->rt6_info is used or freed at this point, reset to NULL*/ | |
2986 | nh->rt6_info = NULL; | |
2987 | if (err) { | |
2988 | if (replace && nhn) | |
2989 | ip6_print_replace_route_err(&rt6_nh_list); | |
2990 | err_nh = nh; | |
2991 | goto add_errout; | |
51ebd318 | 2992 | } |
6b9ea5a6 | 2993 | |
1a72418b | 2994 | /* Because each route is added like a single route we remove |
27596472 MK |
2995 | * these flags after the first nexthop: if there is a collision, |
2996 | * we have already failed to add the first nexthop: | |
2997 | * fib6_add_rt2node() has rejected it; when replacing, old | |
2998 | * nexthops have been replaced by first new, the rest should | |
2999 | * be added to it. | |
1a72418b | 3000 | */ |
27596472 MK |
3001 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
3002 | NLM_F_REPLACE); | |
6b9ea5a6 RP |
3003 | nhn++; |
3004 | } | |
3005 | ||
3006 | goto cleanup; | |
3007 | ||
3008 | add_errout: | |
3009 | /* Delete routes that were already added */ | |
3010 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
3011 | if (err_nh == nh) | |
3012 | break; | |
3013 | ip6_route_del(&nh->r_cfg); | |
3014 | } | |
3015 | ||
3016 | cleanup: | |
3017 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
3018 | if (nh->rt6_info) | |
3019 | dst_free(&nh->rt6_info->dst); | |
52fe51f8 | 3020 | kfree(nh->mxc.mx); |
6b9ea5a6 RP |
3021 | list_del(&nh->next); |
3022 | kfree(nh); | |
3023 | } | |
3024 | ||
3025 | return err; | |
3026 | } | |
3027 | ||
3028 | static int ip6_route_multipath_del(struct fib6_config *cfg) | |
3029 | { | |
3030 | struct fib6_config r_cfg; | |
3031 | struct rtnexthop *rtnh; | |
3032 | int remaining; | |
3033 | int attrlen; | |
3034 | int err = 1, last_err = 0; | |
3035 | ||
3036 | remaining = cfg->fc_mp_len; | |
3037 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
3038 | ||
3039 | /* Parse a Multipath Entry */ | |
3040 | while (rtnh_ok(rtnh, remaining)) { | |
3041 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
3042 | if (rtnh->rtnh_ifindex) | |
3043 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
3044 | ||
3045 | attrlen = rtnh_attrlen(rtnh); | |
3046 | if (attrlen > 0) { | |
3047 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
3048 | ||
3049 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
3050 | if (nla) { | |
3051 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
3052 | r_cfg.fc_flags |= RTF_GATEWAY; | |
3053 | } | |
3054 | } | |
3055 | err = ip6_route_del(&r_cfg); | |
3056 | if (err) | |
3057 | last_err = err; | |
3058 | ||
51ebd318 ND |
3059 | rtnh = rtnh_next(rtnh, &remaining); |
3060 | } | |
3061 | ||
3062 | return last_err; | |
3063 | } | |
3064 | ||
67ba4152 | 3065 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 3066 | { |
86872cb5 TG |
3067 | struct fib6_config cfg; |
3068 | int err; | |
1da177e4 | 3069 | |
86872cb5 TG |
3070 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
3071 | if (err < 0) | |
3072 | return err; | |
3073 | ||
51ebd318 | 3074 | if (cfg.fc_mp) |
6b9ea5a6 | 3075 | return ip6_route_multipath_del(&cfg); |
51ebd318 ND |
3076 | else |
3077 | return ip6_route_del(&cfg); | |
1da177e4 LT |
3078 | } |
3079 | ||
67ba4152 | 3080 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 3081 | { |
86872cb5 TG |
3082 | struct fib6_config cfg; |
3083 | int err; | |
1da177e4 | 3084 | |
86872cb5 TG |
3085 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
3086 | if (err < 0) | |
3087 | return err; | |
3088 | ||
51ebd318 | 3089 | if (cfg.fc_mp) |
6b9ea5a6 | 3090 | return ip6_route_multipath_add(&cfg); |
51ebd318 ND |
3091 | else |
3092 | return ip6_route_add(&cfg); | |
1da177e4 LT |
3093 | } |
3094 | ||
19e42e45 | 3095 | static inline size_t rt6_nlmsg_size(struct rt6_info *rt) |
339bf98f TG |
3096 | { |
3097 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
3098 | + nla_total_size(16) /* RTA_SRC */ | |
3099 | + nla_total_size(16) /* RTA_DST */ | |
3100 | + nla_total_size(16) /* RTA_GATEWAY */ | |
3101 | + nla_total_size(16) /* RTA_PREFSRC */ | |
3102 | + nla_total_size(4) /* RTA_TABLE */ | |
3103 | + nla_total_size(4) /* RTA_IIF */ | |
3104 | + nla_total_size(4) /* RTA_OIF */ | |
3105 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 3106 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 3107 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 3108 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 3109 | + nla_total_size(1) /* RTA_PREF */ |
61adedf3 | 3110 | + lwtunnel_get_encap_size(rt->dst.lwtstate); |
339bf98f TG |
3111 | } |
3112 | ||
191cd582 BH |
3113 | static int rt6_fill_node(struct net *net, |
3114 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 3115 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 3116 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 3117 | int prefix, int nowait, unsigned int flags) |
1da177e4 | 3118 | { |
4b32b5ad | 3119 | u32 metrics[RTAX_MAX]; |
1da177e4 | 3120 | struct rtmsg *rtm; |
2d7202bf | 3121 | struct nlmsghdr *nlh; |
e3703b3d | 3122 | long expires; |
9e762a4a | 3123 | u32 table; |
1da177e4 LT |
3124 | |
3125 | if (prefix) { /* user wants prefix routes only */ | |
3126 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
3127 | /* success since this is not a prefix route */ | |
3128 | return 1; | |
3129 | } | |
3130 | } | |
3131 | ||
15e47304 | 3132 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 3133 | if (!nlh) |
26932566 | 3134 | return -EMSGSIZE; |
2d7202bf TG |
3135 | |
3136 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
3137 | rtm->rtm_family = AF_INET6; |
3138 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
3139 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
3140 | rtm->rtm_tos = 0; | |
c71099ac | 3141 | if (rt->rt6i_table) |
9e762a4a | 3142 | table = rt->rt6i_table->tb6_id; |
c71099ac | 3143 | else |
9e762a4a PM |
3144 | table = RT6_TABLE_UNSPEC; |
3145 | rtm->rtm_table = table; | |
c78679e8 DM |
3146 | if (nla_put_u32(skb, RTA_TABLE, table)) |
3147 | goto nla_put_failure; | |
ef2c7d7b ND |
3148 | if (rt->rt6i_flags & RTF_REJECT) { |
3149 | switch (rt->dst.error) { | |
3150 | case -EINVAL: | |
3151 | rtm->rtm_type = RTN_BLACKHOLE; | |
3152 | break; | |
3153 | case -EACCES: | |
3154 | rtm->rtm_type = RTN_PROHIBIT; | |
3155 | break; | |
b4949ab2 ND |
3156 | case -EAGAIN: |
3157 | rtm->rtm_type = RTN_THROW; | |
3158 | break; | |
ef2c7d7b ND |
3159 | default: |
3160 | rtm->rtm_type = RTN_UNREACHABLE; | |
3161 | break; | |
3162 | } | |
3163 | } | |
38308473 | 3164 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 3165 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 3166 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
3167 | rtm->rtm_type = RTN_LOCAL; |
3168 | else | |
3169 | rtm->rtm_type = RTN_UNICAST; | |
3170 | rtm->rtm_flags = 0; | |
35103d11 | 3171 | if (!netif_carrier_ok(rt->dst.dev)) { |
cea45e20 | 3172 | rtm->rtm_flags |= RTNH_F_LINKDOWN; |
35103d11 AG |
3173 | if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown) |
3174 | rtm->rtm_flags |= RTNH_F_DEAD; | |
3175 | } | |
1da177e4 LT |
3176 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
3177 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 3178 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 3179 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
3180 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
3181 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
3182 | rtm->rtm_protocol = RTPROT_RA; | |
3183 | else | |
3184 | rtm->rtm_protocol = RTPROT_KERNEL; | |
3185 | } | |
1da177e4 | 3186 | |
38308473 | 3187 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
3188 | rtm->rtm_flags |= RTM_F_CLONED; |
3189 | ||
3190 | if (dst) { | |
930345ea | 3191 | if (nla_put_in6_addr(skb, RTA_DST, dst)) |
c78679e8 | 3192 | goto nla_put_failure; |
1ab1457c | 3193 | rtm->rtm_dst_len = 128; |
1da177e4 | 3194 | } else if (rtm->rtm_dst_len) |
930345ea | 3195 | if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr)) |
c78679e8 | 3196 | goto nla_put_failure; |
1da177e4 LT |
3197 | #ifdef CONFIG_IPV6_SUBTREES |
3198 | if (src) { | |
930345ea | 3199 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 3200 | goto nla_put_failure; |
1ab1457c | 3201 | rtm->rtm_src_len = 128; |
c78679e8 | 3202 | } else if (rtm->rtm_src_len && |
930345ea | 3203 | nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr)) |
c78679e8 | 3204 | goto nla_put_failure; |
1da177e4 | 3205 | #endif |
7bc570c8 YH |
3206 | if (iif) { |
3207 | #ifdef CONFIG_IPV6_MROUTE | |
3208 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 3209 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
3210 | if (err <= 0) { |
3211 | if (!nowait) { | |
3212 | if (err == 0) | |
3213 | return 0; | |
3214 | goto nla_put_failure; | |
3215 | } else { | |
3216 | if (err == -EMSGSIZE) | |
3217 | goto nla_put_failure; | |
3218 | } | |
3219 | } | |
3220 | } else | |
3221 | #endif | |
c78679e8 DM |
3222 | if (nla_put_u32(skb, RTA_IIF, iif)) |
3223 | goto nla_put_failure; | |
7bc570c8 | 3224 | } else if (dst) { |
1da177e4 | 3225 | struct in6_addr saddr_buf; |
c78679e8 | 3226 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
930345ea | 3227 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3228 | goto nla_put_failure; |
1da177e4 | 3229 | } |
2d7202bf | 3230 | |
c3968a85 DW |
3231 | if (rt->rt6i_prefsrc.plen) { |
3232 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 3233 | saddr_buf = rt->rt6i_prefsrc.addr; |
930345ea | 3234 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3235 | goto nla_put_failure; |
c3968a85 DW |
3236 | } |
3237 | ||
4b32b5ad MKL |
3238 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
3239 | if (rt->rt6i_pmtu) | |
3240 | metrics[RTAX_MTU - 1] = rt->rt6i_pmtu; | |
3241 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
2d7202bf TG |
3242 | goto nla_put_failure; |
3243 | ||
dd0cbf29 | 3244 | if (rt->rt6i_flags & RTF_GATEWAY) { |
930345ea | 3245 | if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0) |
94f826b8 | 3246 | goto nla_put_failure; |
94f826b8 | 3247 | } |
2d7202bf | 3248 | |
c78679e8 DM |
3249 | if (rt->dst.dev && |
3250 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
3251 | goto nla_put_failure; | |
3252 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
3253 | goto nla_put_failure; | |
8253947e LW |
3254 | |
3255 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 3256 | |
87a50699 | 3257 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 3258 | goto nla_put_failure; |
2d7202bf | 3259 | |
c78ba6d6 LR |
3260 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags))) |
3261 | goto nla_put_failure; | |
3262 | ||
61adedf3 | 3263 | lwtunnel_fill_encap(skb, rt->dst.lwtstate); |
19e42e45 | 3264 | |
053c095a JB |
3265 | nlmsg_end(skb, nlh); |
3266 | return 0; | |
2d7202bf TG |
3267 | |
3268 | nla_put_failure: | |
26932566 PM |
3269 | nlmsg_cancel(skb, nlh); |
3270 | return -EMSGSIZE; | |
1da177e4 LT |
3271 | } |
3272 | ||
1b43af54 | 3273 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
3274 | { |
3275 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
3276 | int prefix; | |
3277 | ||
2d7202bf TG |
3278 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
3279 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
3280 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
3281 | } else | |
3282 | prefix = 0; | |
3283 | ||
191cd582 BH |
3284 | return rt6_fill_node(arg->net, |
3285 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 3286 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 3287 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
3288 | } |
3289 | ||
67ba4152 | 3290 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) |
1da177e4 | 3291 | { |
3b1e0a65 | 3292 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
3293 | struct nlattr *tb[RTA_MAX+1]; |
3294 | struct rt6_info *rt; | |
1da177e4 | 3295 | struct sk_buff *skb; |
ab364a6f | 3296 | struct rtmsg *rtm; |
4c9483b2 | 3297 | struct flowi6 fl6; |
72331bc0 | 3298 | int err, iif = 0, oif = 0; |
1da177e4 | 3299 | |
ab364a6f TG |
3300 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
3301 | if (err < 0) | |
3302 | goto errout; | |
1da177e4 | 3303 | |
ab364a6f | 3304 | err = -EINVAL; |
4c9483b2 | 3305 | memset(&fl6, 0, sizeof(fl6)); |
38b7097b HFS |
3306 | rtm = nlmsg_data(nlh); |
3307 | fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0); | |
1da177e4 | 3308 | |
ab364a6f TG |
3309 | if (tb[RTA_SRC]) { |
3310 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
3311 | goto errout; | |
3312 | ||
4e3fd7a0 | 3313 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
3314 | } |
3315 | ||
3316 | if (tb[RTA_DST]) { | |
3317 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
3318 | goto errout; | |
3319 | ||
4e3fd7a0 | 3320 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
3321 | } |
3322 | ||
3323 | if (tb[RTA_IIF]) | |
3324 | iif = nla_get_u32(tb[RTA_IIF]); | |
3325 | ||
3326 | if (tb[RTA_OIF]) | |
72331bc0 | 3327 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 3328 | |
2e47b291 LC |
3329 | if (tb[RTA_MARK]) |
3330 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
3331 | ||
1da177e4 LT |
3332 | if (iif) { |
3333 | struct net_device *dev; | |
72331bc0 SL |
3334 | int flags = 0; |
3335 | ||
5578689a | 3336 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
3337 | if (!dev) { |
3338 | err = -ENODEV; | |
ab364a6f | 3339 | goto errout; |
1da177e4 | 3340 | } |
72331bc0 SL |
3341 | |
3342 | fl6.flowi6_iif = iif; | |
3343 | ||
3344 | if (!ipv6_addr_any(&fl6.saddr)) | |
3345 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3346 | ||
3347 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
3348 | flags); | |
3349 | } else { | |
3350 | fl6.flowi6_oif = oif; | |
3351 | ||
3352 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
3353 | } |
3354 | ||
ab364a6f | 3355 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 3356 | if (!skb) { |
94e187c0 | 3357 | ip6_rt_put(rt); |
ab364a6f TG |
3358 | err = -ENOBUFS; |
3359 | goto errout; | |
3360 | } | |
1da177e4 | 3361 | |
ab364a6f TG |
3362 | /* Reserve room for dummy headers, this skb can pass |
3363 | through good chunk of routing engine. | |
3364 | */ | |
459a98ed | 3365 | skb_reset_mac_header(skb); |
ab364a6f | 3366 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 3367 | |
d8d1f30b | 3368 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 3369 | |
4c9483b2 | 3370 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 3371 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 3372 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 3373 | if (err < 0) { |
ab364a6f TG |
3374 | kfree_skb(skb); |
3375 | goto errout; | |
1da177e4 LT |
3376 | } |
3377 | ||
15e47304 | 3378 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 3379 | errout: |
1da177e4 | 3380 | return err; |
1da177e4 LT |
3381 | } |
3382 | ||
37a1d361 RP |
3383 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info, |
3384 | unsigned int nlm_flags) | |
1da177e4 LT |
3385 | { |
3386 | struct sk_buff *skb; | |
5578689a | 3387 | struct net *net = info->nl_net; |
528c4ceb DL |
3388 | u32 seq; |
3389 | int err; | |
3390 | ||
3391 | err = -ENOBUFS; | |
38308473 | 3392 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 3393 | |
19e42e45 | 3394 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 3395 | if (!skb) |
21713ebc TG |
3396 | goto errout; |
3397 | ||
191cd582 | 3398 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
37a1d361 | 3399 | event, info->portid, seq, 0, 0, nlm_flags); |
26932566 PM |
3400 | if (err < 0) { |
3401 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
3402 | WARN_ON(err == -EMSGSIZE); | |
3403 | kfree_skb(skb); | |
3404 | goto errout; | |
3405 | } | |
15e47304 | 3406 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
3407 | info->nlh, gfp_any()); |
3408 | return; | |
21713ebc TG |
3409 | errout: |
3410 | if (err < 0) | |
5578689a | 3411 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
3412 | } |
3413 | ||
8ed67789 | 3414 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 3415 | unsigned long event, void *ptr) |
8ed67789 | 3416 | { |
351638e7 | 3417 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3418 | struct net *net = dev_net(dev); |
8ed67789 DL |
3419 | |
3420 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 3421 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
3422 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
3423 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3424 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 3425 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 3426 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
3427 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
3428 | #endif | |
3429 | } | |
3430 | ||
3431 | return NOTIFY_OK; | |
3432 | } | |
3433 | ||
1da177e4 LT |
3434 | /* |
3435 | * /proc | |
3436 | */ | |
3437 | ||
3438 | #ifdef CONFIG_PROC_FS | |
3439 | ||
33120b30 AD |
3440 | static const struct file_operations ipv6_route_proc_fops = { |
3441 | .owner = THIS_MODULE, | |
3442 | .open = ipv6_route_open, | |
3443 | .read = seq_read, | |
3444 | .llseek = seq_lseek, | |
8d2ca1d7 | 3445 | .release = seq_release_net, |
33120b30 AD |
3446 | }; |
3447 | ||
1da177e4 LT |
3448 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
3449 | { | |
69ddb805 | 3450 | struct net *net = (struct net *)seq->private; |
1da177e4 | 3451 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
3452 | net->ipv6.rt6_stats->fib_nodes, |
3453 | net->ipv6.rt6_stats->fib_route_nodes, | |
3454 | net->ipv6.rt6_stats->fib_rt_alloc, | |
3455 | net->ipv6.rt6_stats->fib_rt_entries, | |
3456 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 3457 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 3458 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
3459 | |
3460 | return 0; | |
3461 | } | |
3462 | ||
3463 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
3464 | { | |
de05c557 | 3465 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
3466 | } |
3467 | ||
9a32144e | 3468 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
3469 | .owner = THIS_MODULE, |
3470 | .open = rt6_stats_seq_open, | |
3471 | .read = seq_read, | |
3472 | .llseek = seq_lseek, | |
b6fcbdb4 | 3473 | .release = single_release_net, |
1da177e4 LT |
3474 | }; |
3475 | #endif /* CONFIG_PROC_FS */ | |
3476 | ||
3477 | #ifdef CONFIG_SYSCTL | |
3478 | ||
1da177e4 | 3479 | static |
fe2c6338 | 3480 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
3481 | void __user *buffer, size_t *lenp, loff_t *ppos) |
3482 | { | |
c486da34 LAG |
3483 | struct net *net; |
3484 | int delay; | |
3485 | if (!write) | |
1da177e4 | 3486 | return -EINVAL; |
c486da34 LAG |
3487 | |
3488 | net = (struct net *)ctl->extra1; | |
3489 | delay = net->ipv6.sysctl.flush_delay; | |
3490 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 3491 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 3492 | return 0; |
1da177e4 LT |
3493 | } |
3494 | ||
fe2c6338 | 3495 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 3496 | { |
1da177e4 | 3497 | .procname = "flush", |
4990509f | 3498 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 3499 | .maxlen = sizeof(int), |
89c8b3a1 | 3500 | .mode = 0200, |
6d9f239a | 3501 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
3502 | }, |
3503 | { | |
1da177e4 | 3504 | .procname = "gc_thresh", |
9a7ec3a9 | 3505 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
3506 | .maxlen = sizeof(int), |
3507 | .mode = 0644, | |
6d9f239a | 3508 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3509 | }, |
3510 | { | |
1da177e4 | 3511 | .procname = "max_size", |
4990509f | 3512 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
3513 | .maxlen = sizeof(int), |
3514 | .mode = 0644, | |
6d9f239a | 3515 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3516 | }, |
3517 | { | |
1da177e4 | 3518 | .procname = "gc_min_interval", |
4990509f | 3519 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3520 | .maxlen = sizeof(int), |
3521 | .mode = 0644, | |
6d9f239a | 3522 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3523 | }, |
3524 | { | |
1da177e4 | 3525 | .procname = "gc_timeout", |
4990509f | 3526 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
3527 | .maxlen = sizeof(int), |
3528 | .mode = 0644, | |
6d9f239a | 3529 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3530 | }, |
3531 | { | |
1da177e4 | 3532 | .procname = "gc_interval", |
4990509f | 3533 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
3534 | .maxlen = sizeof(int), |
3535 | .mode = 0644, | |
6d9f239a | 3536 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3537 | }, |
3538 | { | |
1da177e4 | 3539 | .procname = "gc_elasticity", |
4990509f | 3540 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
3541 | .maxlen = sizeof(int), |
3542 | .mode = 0644, | |
f3d3f616 | 3543 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3544 | }, |
3545 | { | |
1da177e4 | 3546 | .procname = "mtu_expires", |
4990509f | 3547 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
3548 | .maxlen = sizeof(int), |
3549 | .mode = 0644, | |
6d9f239a | 3550 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3551 | }, |
3552 | { | |
1da177e4 | 3553 | .procname = "min_adv_mss", |
4990509f | 3554 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
3555 | .maxlen = sizeof(int), |
3556 | .mode = 0644, | |
f3d3f616 | 3557 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3558 | }, |
3559 | { | |
1da177e4 | 3560 | .procname = "gc_min_interval_ms", |
4990509f | 3561 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3562 | .maxlen = sizeof(int), |
3563 | .mode = 0644, | |
6d9f239a | 3564 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 3565 | }, |
f8572d8f | 3566 | { } |
1da177e4 LT |
3567 | }; |
3568 | ||
2c8c1e72 | 3569 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
3570 | { |
3571 | struct ctl_table *table; | |
3572 | ||
3573 | table = kmemdup(ipv6_route_table_template, | |
3574 | sizeof(ipv6_route_table_template), | |
3575 | GFP_KERNEL); | |
5ee09105 YH |
3576 | |
3577 | if (table) { | |
3578 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 3579 | table[0].extra1 = net; |
86393e52 | 3580 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
3581 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
3582 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
3583 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3584 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
3585 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3586 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
3587 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 3588 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
3589 | |
3590 | /* Don't export sysctls to unprivileged users */ | |
3591 | if (net->user_ns != &init_user_ns) | |
3592 | table[0].procname = NULL; | |
5ee09105 YH |
3593 | } |
3594 | ||
760f2d01 DL |
3595 | return table; |
3596 | } | |
1da177e4 LT |
3597 | #endif |
3598 | ||
2c8c1e72 | 3599 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 3600 | { |
633d424b | 3601 | int ret = -ENOMEM; |
8ed67789 | 3602 | |
86393e52 AD |
3603 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
3604 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 3605 | |
fc66f95c ED |
3606 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
3607 | goto out_ip6_dst_ops; | |
3608 | ||
8ed67789 DL |
3609 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
3610 | sizeof(*net->ipv6.ip6_null_entry), | |
3611 | GFP_KERNEL); | |
3612 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 3613 | goto out_ip6_dst_entries; |
d8d1f30b | 3614 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 3615 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 3616 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3617 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
3618 | ip6_template_metrics, true); | |
8ed67789 DL |
3619 | |
3620 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3621 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
3622 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
3623 | GFP_KERNEL); | |
68fffc67 PZ |
3624 | if (!net->ipv6.ip6_prohibit_entry) |
3625 | goto out_ip6_null_entry; | |
d8d1f30b | 3626 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 3627 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 3628 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3629 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
3630 | ip6_template_metrics, true); | |
8ed67789 DL |
3631 | |
3632 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
3633 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
3634 | GFP_KERNEL); | |
68fffc67 PZ |
3635 | if (!net->ipv6.ip6_blk_hole_entry) |
3636 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 3637 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 3638 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 3639 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3640 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
3641 | ip6_template_metrics, true); | |
8ed67789 DL |
3642 | #endif |
3643 | ||
b339a47c PZ |
3644 | net->ipv6.sysctl.flush_delay = 0; |
3645 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3646 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3647 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3648 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3649 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
3650 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
3651 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
3652 | ||
6891a346 BT |
3653 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
3654 | ||
8ed67789 DL |
3655 | ret = 0; |
3656 | out: | |
3657 | return ret; | |
f2fc6a54 | 3658 | |
68fffc67 PZ |
3659 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
3660 | out_ip6_prohibit_entry: | |
3661 | kfree(net->ipv6.ip6_prohibit_entry); | |
3662 | out_ip6_null_entry: | |
3663 | kfree(net->ipv6.ip6_null_entry); | |
3664 | #endif | |
fc66f95c ED |
3665 | out_ip6_dst_entries: |
3666 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3667 | out_ip6_dst_ops: |
f2fc6a54 | 3668 | goto out; |
cdb18761 DL |
3669 | } |
3670 | ||
2c8c1e72 | 3671 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3672 | { |
8ed67789 DL |
3673 | kfree(net->ipv6.ip6_null_entry); |
3674 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3675 | kfree(net->ipv6.ip6_prohibit_entry); | |
3676 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3677 | #endif | |
41bb78b4 | 3678 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3679 | } |
3680 | ||
d189634e TG |
3681 | static int __net_init ip6_route_net_init_late(struct net *net) |
3682 | { | |
3683 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
3684 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
3685 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3686 | #endif |
3687 | return 0; | |
3688 | } | |
3689 | ||
3690 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3691 | { | |
3692 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3693 | remove_proc_entry("ipv6_route", net->proc_net); |
3694 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3695 | #endif |
3696 | } | |
3697 | ||
cdb18761 DL |
3698 | static struct pernet_operations ip6_route_net_ops = { |
3699 | .init = ip6_route_net_init, | |
3700 | .exit = ip6_route_net_exit, | |
3701 | }; | |
3702 | ||
c3426b47 DM |
3703 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3704 | { | |
3705 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3706 | ||
3707 | if (!bp) | |
3708 | return -ENOMEM; | |
3709 | inet_peer_base_init(bp); | |
3710 | net->ipv6.peers = bp; | |
3711 | return 0; | |
3712 | } | |
3713 | ||
3714 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3715 | { | |
3716 | struct inet_peer_base *bp = net->ipv6.peers; | |
3717 | ||
3718 | net->ipv6.peers = NULL; | |
56a6b248 | 3719 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3720 | kfree(bp); |
3721 | } | |
3722 | ||
2b823f72 | 3723 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3724 | .init = ipv6_inetpeer_init, |
3725 | .exit = ipv6_inetpeer_exit, | |
3726 | }; | |
3727 | ||
d189634e TG |
3728 | static struct pernet_operations ip6_route_net_late_ops = { |
3729 | .init = ip6_route_net_init_late, | |
3730 | .exit = ip6_route_net_exit_late, | |
3731 | }; | |
3732 | ||
8ed67789 DL |
3733 | static struct notifier_block ip6_route_dev_notifier = { |
3734 | .notifier_call = ip6_route_dev_notify, | |
3735 | .priority = 0, | |
3736 | }; | |
3737 | ||
433d49c3 | 3738 | int __init ip6_route_init(void) |
1da177e4 | 3739 | { |
433d49c3 | 3740 | int ret; |
8d0b94af | 3741 | int cpu; |
433d49c3 | 3742 | |
9a7ec3a9 DL |
3743 | ret = -ENOMEM; |
3744 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3745 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3746 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3747 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3748 | goto out; |
14e50e57 | 3749 | |
fc66f95c | 3750 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3751 | if (ret) |
bdb3289f | 3752 | goto out_kmem_cache; |
bdb3289f | 3753 | |
c3426b47 DM |
3754 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3755 | if (ret) | |
e8803b6c | 3756 | goto out_dst_entries; |
2a0c451a | 3757 | |
7e52b33b DM |
3758 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3759 | if (ret) | |
3760 | goto out_register_inetpeer; | |
c3426b47 | 3761 | |
5dc121e9 AE |
3762 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3763 | ||
8ed67789 DL |
3764 | /* Registering of the loopback is done before this portion of code, |
3765 | * the loopback reference in rt6_info will not be taken, do it | |
3766 | * manually for init_net */ | |
d8d1f30b | 3767 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3768 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3769 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3770 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3771 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3772 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3773 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3774 | #endif | |
e8803b6c | 3775 | ret = fib6_init(); |
433d49c3 | 3776 | if (ret) |
8ed67789 | 3777 | goto out_register_subsys; |
433d49c3 | 3778 | |
433d49c3 DL |
3779 | ret = xfrm6_init(); |
3780 | if (ret) | |
e8803b6c | 3781 | goto out_fib6_init; |
c35b7e72 | 3782 | |
433d49c3 DL |
3783 | ret = fib6_rules_init(); |
3784 | if (ret) | |
3785 | goto xfrm6_init; | |
7e5449c2 | 3786 | |
d189634e TG |
3787 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3788 | if (ret) | |
3789 | goto fib6_rules_init; | |
3790 | ||
433d49c3 | 3791 | ret = -ENOBUFS; |
c7ac8679 GR |
3792 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3793 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3794 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3795 | goto out_register_late_subsys; |
c127ea2c | 3796 | |
8ed67789 | 3797 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3798 | if (ret) |
d189634e | 3799 | goto out_register_late_subsys; |
8ed67789 | 3800 | |
8d0b94af MKL |
3801 | for_each_possible_cpu(cpu) { |
3802 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
3803 | ||
3804 | INIT_LIST_HEAD(&ul->head); | |
3805 | spin_lock_init(&ul->lock); | |
3806 | } | |
3807 | ||
433d49c3 DL |
3808 | out: |
3809 | return ret; | |
3810 | ||
d189634e TG |
3811 | out_register_late_subsys: |
3812 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3813 | fib6_rules_init: |
433d49c3 DL |
3814 | fib6_rules_cleanup(); |
3815 | xfrm6_init: | |
433d49c3 | 3816 | xfrm6_fini(); |
2a0c451a TG |
3817 | out_fib6_init: |
3818 | fib6_gc_cleanup(); | |
8ed67789 DL |
3819 | out_register_subsys: |
3820 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3821 | out_register_inetpeer: |
3822 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3823 | out_dst_entries: |
3824 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3825 | out_kmem_cache: |
f2fc6a54 | 3826 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3827 | goto out; |
1da177e4 LT |
3828 | } |
3829 | ||
3830 | void ip6_route_cleanup(void) | |
3831 | { | |
8ed67789 | 3832 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3833 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3834 | fib6_rules_cleanup(); |
1da177e4 | 3835 | xfrm6_fini(); |
1da177e4 | 3836 | fib6_gc_cleanup(); |
c3426b47 | 3837 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3838 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3839 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3840 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3841 | } |