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 | ||
d52d3997 MKL |
341 | static struct rt6_info *ip6_dst_alloc(struct net *net, |
342 | struct net_device *dev, | |
ad706862 | 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 | } | |
367 | ||
1da177e4 LT |
368 | static void ip6_dst_destroy(struct dst_entry *dst) |
369 | { | |
370 | struct rt6_info *rt = (struct rt6_info *)dst; | |
ecd98837 | 371 | struct dst_entry *from = dst->from; |
8d0b94af | 372 | struct inet6_dev *idev; |
1da177e4 | 373 | |
4b32b5ad | 374 | dst_destroy_metrics_generic(dst); |
87775312 | 375 | free_percpu(rt->rt6i_pcpu); |
8d0b94af MKL |
376 | rt6_uncached_list_del(rt); |
377 | ||
378 | idev = rt->rt6i_idev; | |
38308473 | 379 | if (idev) { |
1da177e4 LT |
380 | rt->rt6i_idev = NULL; |
381 | in6_dev_put(idev); | |
1ab1457c | 382 | } |
1716a961 | 383 | |
ecd98837 YH |
384 | dst->from = NULL; |
385 | dst_release(from); | |
b3419363 DM |
386 | } |
387 | ||
1da177e4 LT |
388 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
389 | int how) | |
390 | { | |
391 | struct rt6_info *rt = (struct rt6_info *)dst; | |
392 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 393 | struct net_device *loopback_dev = |
c346dca1 | 394 | dev_net(dev)->loopback_dev; |
1da177e4 | 395 | |
97cac082 DM |
396 | if (dev != loopback_dev) { |
397 | if (idev && idev->dev == dev) { | |
398 | struct inet6_dev *loopback_idev = | |
399 | in6_dev_get(loopback_dev); | |
400 | if (loopback_idev) { | |
401 | rt->rt6i_idev = loopback_idev; | |
402 | in6_dev_put(idev); | |
403 | } | |
404 | } | |
1da177e4 LT |
405 | } |
406 | } | |
407 | ||
5973fb1e MKL |
408 | static bool __rt6_check_expired(const struct rt6_info *rt) |
409 | { | |
410 | if (rt->rt6i_flags & RTF_EXPIRES) | |
411 | return time_after(jiffies, rt->dst.expires); | |
412 | else | |
413 | return false; | |
414 | } | |
415 | ||
a50feda5 | 416 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 417 | { |
1716a961 G |
418 | if (rt->rt6i_flags & RTF_EXPIRES) { |
419 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 420 | return true; |
1716a961 | 421 | } else if (rt->dst.from) { |
3fd91fb3 | 422 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 423 | } |
a50feda5 | 424 | return false; |
1da177e4 LT |
425 | } |
426 | ||
51ebd318 ND |
427 | /* Multipath route selection: |
428 | * Hash based function using packet header and flowlabel. | |
429 | * Adapted from fib_info_hashfn() | |
430 | */ | |
431 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
432 | const struct flowi6 *fl6) | |
433 | { | |
644d0e65 | 434 | return get_hash_from_flowi6(fl6) % candidate_count; |
51ebd318 ND |
435 | } |
436 | ||
437 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
52bd4c0c ND |
438 | struct flowi6 *fl6, int oif, |
439 | int strict) | |
51ebd318 ND |
440 | { |
441 | struct rt6_info *sibling, *next_sibling; | |
442 | int route_choosen; | |
443 | ||
444 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
445 | /* Don't change the route, if route_choosen == 0 | |
446 | * (siblings does not include ourself) | |
447 | */ | |
448 | if (route_choosen) | |
449 | list_for_each_entry_safe(sibling, next_sibling, | |
450 | &match->rt6i_siblings, rt6i_siblings) { | |
451 | route_choosen--; | |
452 | if (route_choosen == 0) { | |
52bd4c0c ND |
453 | if (rt6_score_route(sibling, oif, strict) < 0) |
454 | break; | |
51ebd318 ND |
455 | match = sibling; |
456 | break; | |
457 | } | |
458 | } | |
459 | return match; | |
460 | } | |
461 | ||
1da177e4 | 462 | /* |
c71099ac | 463 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
464 | */ |
465 | ||
8ed67789 DL |
466 | static inline struct rt6_info *rt6_device_match(struct net *net, |
467 | struct rt6_info *rt, | |
b71d1d42 | 468 | const struct in6_addr *saddr, |
1da177e4 | 469 | int oif, |
d420895e | 470 | int flags) |
1da177e4 LT |
471 | { |
472 | struct rt6_info *local = NULL; | |
473 | struct rt6_info *sprt; | |
474 | ||
dd3abc4e YH |
475 | if (!oif && ipv6_addr_any(saddr)) |
476 | goto out; | |
477 | ||
d8d1f30b | 478 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 479 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
480 | |
481 | if (oif) { | |
1da177e4 LT |
482 | if (dev->ifindex == oif) |
483 | return sprt; | |
484 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 485 | if (!sprt->rt6i_idev || |
1da177e4 | 486 | sprt->rt6i_idev->dev->ifindex != oif) { |
17fb0b2b | 487 | if (flags & RT6_LOOKUP_F_IFACE) |
1da177e4 | 488 | continue; |
17fb0b2b DA |
489 | if (local && |
490 | local->rt6i_idev->dev->ifindex == oif) | |
1da177e4 LT |
491 | continue; |
492 | } | |
493 | local = sprt; | |
494 | } | |
dd3abc4e YH |
495 | } else { |
496 | if (ipv6_chk_addr(net, saddr, dev, | |
497 | flags & RT6_LOOKUP_F_IFACE)) | |
498 | return sprt; | |
1da177e4 | 499 | } |
dd3abc4e | 500 | } |
1da177e4 | 501 | |
dd3abc4e | 502 | if (oif) { |
1da177e4 LT |
503 | if (local) |
504 | return local; | |
505 | ||
d420895e | 506 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 507 | return net->ipv6.ip6_null_entry; |
1da177e4 | 508 | } |
dd3abc4e | 509 | out: |
1da177e4 LT |
510 | return rt; |
511 | } | |
512 | ||
27097255 | 513 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
514 | struct __rt6_probe_work { |
515 | struct work_struct work; | |
516 | struct in6_addr target; | |
517 | struct net_device *dev; | |
518 | }; | |
519 | ||
520 | static void rt6_probe_deferred(struct work_struct *w) | |
521 | { | |
522 | struct in6_addr mcaddr; | |
523 | struct __rt6_probe_work *work = | |
524 | container_of(w, struct __rt6_probe_work, work); | |
525 | ||
526 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
304d888b | 527 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL); |
c2f17e82 | 528 | dev_put(work->dev); |
662f5533 | 529 | kfree(work); |
c2f17e82 HFS |
530 | } |
531 | ||
27097255 YH |
532 | static void rt6_probe(struct rt6_info *rt) |
533 | { | |
990edb42 | 534 | struct __rt6_probe_work *work; |
f2c31e32 | 535 | struct neighbour *neigh; |
27097255 YH |
536 | /* |
537 | * Okay, this does not seem to be appropriate | |
538 | * for now, however, we need to check if it | |
539 | * is really so; aka Router Reachability Probing. | |
540 | * | |
541 | * Router Reachability Probe MUST be rate-limited | |
542 | * to no more than one per minute. | |
543 | */ | |
2152caea | 544 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 545 | return; |
2152caea YH |
546 | rcu_read_lock_bh(); |
547 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
548 | if (neigh) { | |
8d6c31bf MKL |
549 | if (neigh->nud_state & NUD_VALID) |
550 | goto out; | |
551 | ||
990edb42 | 552 | work = NULL; |
2152caea | 553 | write_lock(&neigh->lock); |
990edb42 MKL |
554 | if (!(neigh->nud_state & NUD_VALID) && |
555 | time_after(jiffies, | |
556 | neigh->updated + | |
557 | rt->rt6i_idev->cnf.rtr_probe_interval)) { | |
558 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
559 | if (work) | |
560 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 561 | } |
2152caea | 562 | write_unlock(&neigh->lock); |
990edb42 MKL |
563 | } else { |
564 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
f2c31e32 | 565 | } |
990edb42 MKL |
566 | |
567 | if (work) { | |
568 | INIT_WORK(&work->work, rt6_probe_deferred); | |
569 | work->target = rt->rt6i_gateway; | |
570 | dev_hold(rt->dst.dev); | |
571 | work->dev = rt->dst.dev; | |
572 | schedule_work(&work->work); | |
573 | } | |
574 | ||
8d6c31bf | 575 | out: |
2152caea | 576 | rcu_read_unlock_bh(); |
27097255 YH |
577 | } |
578 | #else | |
579 | static inline void rt6_probe(struct rt6_info *rt) | |
580 | { | |
27097255 YH |
581 | } |
582 | #endif | |
583 | ||
1da177e4 | 584 | /* |
554cfb7e | 585 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 586 | */ |
b6f99a21 | 587 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 588 | { |
d1918542 | 589 | struct net_device *dev = rt->dst.dev; |
161980f4 | 590 | if (!oif || dev->ifindex == oif) |
554cfb7e | 591 | return 2; |
161980f4 DM |
592 | if ((dev->flags & IFF_LOOPBACK) && |
593 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
594 | return 1; | |
595 | return 0; | |
554cfb7e | 596 | } |
1da177e4 | 597 | |
afc154e9 | 598 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 599 | { |
f2c31e32 | 600 | struct neighbour *neigh; |
afc154e9 | 601 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 602 | |
4d0c5911 YH |
603 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
604 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 605 | return RT6_NUD_SUCCEED; |
145a3621 YH |
606 | |
607 | rcu_read_lock_bh(); | |
608 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
609 | if (neigh) { | |
610 | read_lock(&neigh->lock); | |
554cfb7e | 611 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 612 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 613 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 614 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 615 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
616 | else |
617 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 618 | #endif |
145a3621 | 619 | read_unlock(&neigh->lock); |
afc154e9 HFS |
620 | } else { |
621 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 622 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 623 | } |
145a3621 YH |
624 | rcu_read_unlock_bh(); |
625 | ||
a5a81f0b | 626 | return ret; |
1da177e4 LT |
627 | } |
628 | ||
554cfb7e YH |
629 | static int rt6_score_route(struct rt6_info *rt, int oif, |
630 | int strict) | |
1da177e4 | 631 | { |
a5a81f0b | 632 | int m; |
1ab1457c | 633 | |
4d0c5911 | 634 | m = rt6_check_dev(rt, oif); |
77d16f45 | 635 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 636 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
637 | #ifdef CONFIG_IPV6_ROUTER_PREF |
638 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
639 | #endif | |
afc154e9 HFS |
640 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
641 | int n = rt6_check_neigh(rt); | |
642 | if (n < 0) | |
643 | return n; | |
644 | } | |
554cfb7e YH |
645 | return m; |
646 | } | |
647 | ||
f11e6659 | 648 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
649 | int *mpri, struct rt6_info *match, |
650 | bool *do_rr) | |
554cfb7e | 651 | { |
f11e6659 | 652 | int m; |
afc154e9 | 653 | bool match_do_rr = false; |
35103d11 AG |
654 | struct inet6_dev *idev = rt->rt6i_idev; |
655 | struct net_device *dev = rt->dst.dev; | |
656 | ||
657 | if (dev && !netif_carrier_ok(dev) && | |
658 | idev->cnf.ignore_routes_with_linkdown) | |
659 | goto out; | |
f11e6659 DM |
660 | |
661 | if (rt6_check_expired(rt)) | |
662 | goto out; | |
663 | ||
664 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 665 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
666 | match_do_rr = true; |
667 | m = 0; /* lowest valid score */ | |
7e980569 | 668 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 669 | goto out; |
afc154e9 HFS |
670 | } |
671 | ||
672 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
673 | rt6_probe(rt); | |
f11e6659 | 674 | |
7e980569 | 675 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 676 | if (m > *mpri) { |
afc154e9 | 677 | *do_rr = match_do_rr; |
f11e6659 DM |
678 | *mpri = m; |
679 | match = rt; | |
f11e6659 | 680 | } |
f11e6659 DM |
681 | out: |
682 | return match; | |
683 | } | |
684 | ||
685 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
686 | struct rt6_info *rr_head, | |
afc154e9 HFS |
687 | u32 metric, int oif, int strict, |
688 | bool *do_rr) | |
f11e6659 | 689 | { |
9fbdcfaf | 690 | struct rt6_info *rt, *match, *cont; |
554cfb7e | 691 | int mpri = -1; |
1da177e4 | 692 | |
f11e6659 | 693 | match = NULL; |
9fbdcfaf SK |
694 | cont = NULL; |
695 | for (rt = rr_head; rt; rt = rt->dst.rt6_next) { | |
696 | if (rt->rt6i_metric != metric) { | |
697 | cont = rt; | |
698 | break; | |
699 | } | |
700 | ||
701 | match = find_match(rt, oif, strict, &mpri, match, do_rr); | |
702 | } | |
703 | ||
704 | for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) { | |
705 | if (rt->rt6i_metric != metric) { | |
706 | cont = rt; | |
707 | break; | |
708 | } | |
709 | ||
afc154e9 | 710 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
9fbdcfaf SK |
711 | } |
712 | ||
713 | if (match || !cont) | |
714 | return match; | |
715 | ||
716 | for (rt = cont; rt; rt = rt->dst.rt6_next) | |
afc154e9 | 717 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 718 | |
f11e6659 DM |
719 | return match; |
720 | } | |
1da177e4 | 721 | |
f11e6659 DM |
722 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
723 | { | |
724 | struct rt6_info *match, *rt0; | |
8ed67789 | 725 | struct net *net; |
afc154e9 | 726 | bool do_rr = false; |
1da177e4 | 727 | |
f11e6659 DM |
728 | rt0 = fn->rr_ptr; |
729 | if (!rt0) | |
730 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 731 | |
afc154e9 HFS |
732 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
733 | &do_rr); | |
1da177e4 | 734 | |
afc154e9 | 735 | if (do_rr) { |
d8d1f30b | 736 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 737 | |
554cfb7e | 738 | /* no entries matched; do round-robin */ |
f11e6659 DM |
739 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
740 | next = fn->leaf; | |
741 | ||
742 | if (next != rt0) | |
743 | fn->rr_ptr = next; | |
1da177e4 | 744 | } |
1da177e4 | 745 | |
d1918542 | 746 | net = dev_net(rt0->dst.dev); |
a02cec21 | 747 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
748 | } |
749 | ||
8b9df265 MKL |
750 | static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt) |
751 | { | |
752 | return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)); | |
753 | } | |
754 | ||
70ceb4f5 YH |
755 | #ifdef CONFIG_IPV6_ROUTE_INFO |
756 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 757 | const struct in6_addr *gwaddr) |
70ceb4f5 | 758 | { |
c346dca1 | 759 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
760 | struct route_info *rinfo = (struct route_info *) opt; |
761 | struct in6_addr prefix_buf, *prefix; | |
762 | unsigned int pref; | |
4bed72e4 | 763 | unsigned long lifetime; |
70ceb4f5 YH |
764 | struct rt6_info *rt; |
765 | ||
766 | if (len < sizeof(struct route_info)) { | |
767 | return -EINVAL; | |
768 | } | |
769 | ||
770 | /* Sanity check for prefix_len and length */ | |
771 | if (rinfo->length > 3) { | |
772 | return -EINVAL; | |
773 | } else if (rinfo->prefix_len > 128) { | |
774 | return -EINVAL; | |
775 | } else if (rinfo->prefix_len > 64) { | |
776 | if (rinfo->length < 2) { | |
777 | return -EINVAL; | |
778 | } | |
779 | } else if (rinfo->prefix_len > 0) { | |
780 | if (rinfo->length < 1) { | |
781 | return -EINVAL; | |
782 | } | |
783 | } | |
784 | ||
785 | pref = rinfo->route_pref; | |
786 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 787 | return -EINVAL; |
70ceb4f5 | 788 | |
4bed72e4 | 789 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
790 | |
791 | if (rinfo->length == 3) | |
792 | prefix = (struct in6_addr *)rinfo->prefix; | |
793 | else { | |
794 | /* this function is safe */ | |
795 | ipv6_addr_prefix(&prefix_buf, | |
796 | (struct in6_addr *)rinfo->prefix, | |
797 | rinfo->prefix_len); | |
798 | prefix = &prefix_buf; | |
799 | } | |
800 | ||
f104a567 DJ |
801 | if (rinfo->prefix_len == 0) |
802 | rt = rt6_get_dflt_router(gwaddr, dev); | |
803 | else | |
804 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
805 | gwaddr, dev->ifindex); | |
70ceb4f5 YH |
806 | |
807 | if (rt && !lifetime) { | |
e0a1ad73 | 808 | ip6_del_rt(rt); |
70ceb4f5 YH |
809 | rt = NULL; |
810 | } | |
811 | ||
812 | if (!rt && lifetime) | |
efa2cea0 | 813 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
814 | pref); |
815 | else if (rt) | |
816 | rt->rt6i_flags = RTF_ROUTEINFO | | |
817 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
818 | ||
819 | if (rt) { | |
1716a961 G |
820 | if (!addrconf_finite_timeout(lifetime)) |
821 | rt6_clean_expires(rt); | |
822 | else | |
823 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
824 | ||
94e187c0 | 825 | ip6_rt_put(rt); |
70ceb4f5 YH |
826 | } |
827 | return 0; | |
828 | } | |
829 | #endif | |
830 | ||
a3c00e46 MKL |
831 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
832 | struct in6_addr *saddr) | |
833 | { | |
834 | struct fib6_node *pn; | |
835 | while (1) { | |
836 | if (fn->fn_flags & RTN_TL_ROOT) | |
837 | return NULL; | |
838 | pn = fn->parent; | |
839 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) | |
840 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); | |
841 | else | |
842 | fn = pn; | |
843 | if (fn->fn_flags & RTN_RTINFO) | |
844 | return fn; | |
845 | } | |
846 | } | |
c71099ac | 847 | |
8ed67789 DL |
848 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
849 | struct fib6_table *table, | |
4c9483b2 | 850 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
851 | { |
852 | struct fib6_node *fn; | |
853 | struct rt6_info *rt; | |
854 | ||
c71099ac | 855 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 856 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
857 | restart: |
858 | rt = fn->leaf; | |
4c9483b2 | 859 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 | 860 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
52bd4c0c | 861 | rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); |
a3c00e46 MKL |
862 | if (rt == net->ipv6.ip6_null_entry) { |
863 | fn = fib6_backtrack(fn, &fl6->saddr); | |
864 | if (fn) | |
865 | goto restart; | |
866 | } | |
d8d1f30b | 867 | dst_use(&rt->dst, jiffies); |
c71099ac | 868 | read_unlock_bh(&table->tb6_lock); |
b811580d DA |
869 | |
870 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); | |
871 | ||
c71099ac TG |
872 | return rt; |
873 | ||
874 | } | |
875 | ||
67ba4152 | 876 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
ea6e574e FW |
877 | int flags) |
878 | { | |
879 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
880 | } | |
881 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
882 | ||
9acd9f3a YH |
883 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
884 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 885 | { |
4c9483b2 DM |
886 | struct flowi6 fl6 = { |
887 | .flowi6_oif = oif, | |
888 | .daddr = *daddr, | |
c71099ac TG |
889 | }; |
890 | struct dst_entry *dst; | |
77d16f45 | 891 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 892 | |
adaa70bb | 893 | if (saddr) { |
4c9483b2 | 894 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
895 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
896 | } | |
897 | ||
4c9483b2 | 898 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
899 | if (dst->error == 0) |
900 | return (struct rt6_info *) dst; | |
901 | ||
902 | dst_release(dst); | |
903 | ||
1da177e4 LT |
904 | return NULL; |
905 | } | |
7159039a YH |
906 | EXPORT_SYMBOL(rt6_lookup); |
907 | ||
c71099ac | 908 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
909 | It takes new route entry, the addition fails by any reason the |
910 | route is freed. In any case, if caller does not hold it, it may | |
911 | be destroyed. | |
912 | */ | |
913 | ||
e5fd387a | 914 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, |
e715b6d3 | 915 | struct mx6_config *mxc) |
1da177e4 LT |
916 | { |
917 | int err; | |
c71099ac | 918 | struct fib6_table *table; |
1da177e4 | 919 | |
c71099ac TG |
920 | table = rt->rt6i_table; |
921 | write_lock_bh(&table->tb6_lock); | |
e715b6d3 | 922 | err = fib6_add(&table->tb6_root, rt, info, mxc); |
c71099ac | 923 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
924 | |
925 | return err; | |
926 | } | |
927 | ||
40e22e8f TG |
928 | int ip6_ins_rt(struct rt6_info *rt) |
929 | { | |
e715b6d3 FW |
930 | struct nl_info info = { .nl_net = dev_net(rt->dst.dev), }; |
931 | struct mx6_config mxc = { .mx = NULL, }; | |
932 | ||
933 | return __ip6_ins_rt(rt, &info, &mxc); | |
40e22e8f TG |
934 | } |
935 | ||
8b9df265 MKL |
936 | static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort, |
937 | const struct in6_addr *daddr, | |
938 | const struct in6_addr *saddr) | |
1da177e4 | 939 | { |
1da177e4 LT |
940 | struct rt6_info *rt; |
941 | ||
942 | /* | |
943 | * Clone the route. | |
944 | */ | |
945 | ||
d52d3997 | 946 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) |
83a09abd | 947 | ort = (struct rt6_info *)ort->dst.from; |
1da177e4 | 948 | |
ad706862 | 949 | rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0); |
83a09abd MKL |
950 | |
951 | if (!rt) | |
952 | return NULL; | |
953 | ||
954 | ip6_rt_copy_init(rt, ort); | |
955 | rt->rt6i_flags |= RTF_CACHE; | |
956 | rt->rt6i_metric = 0; | |
957 | rt->dst.flags |= DST_HOST; | |
958 | rt->rt6i_dst.addr = *daddr; | |
959 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 960 | |
83a09abd MKL |
961 | if (!rt6_is_gw_or_nonexthop(ort)) { |
962 | if (ort->rt6i_dst.plen != 128 && | |
963 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
964 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 965 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
966 | if (rt->rt6i_src.plen && saddr) { |
967 | rt->rt6i_src.addr = *saddr; | |
968 | rt->rt6i_src.plen = 128; | |
8b9df265 | 969 | } |
83a09abd | 970 | #endif |
95a9a5ba | 971 | } |
1da177e4 | 972 | |
95a9a5ba YH |
973 | return rt; |
974 | } | |
1da177e4 | 975 | |
d52d3997 MKL |
976 | static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt) |
977 | { | |
978 | struct rt6_info *pcpu_rt; | |
979 | ||
980 | pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev), | |
ad706862 | 981 | rt->dst.dev, rt->dst.flags); |
d52d3997 MKL |
982 | |
983 | if (!pcpu_rt) | |
984 | return NULL; | |
985 | ip6_rt_copy_init(pcpu_rt, rt); | |
986 | pcpu_rt->rt6i_protocol = rt->rt6i_protocol; | |
987 | pcpu_rt->rt6i_flags |= RTF_PCPU; | |
988 | return pcpu_rt; | |
989 | } | |
990 | ||
991 | /* It should be called with read_lock_bh(&tb6_lock) acquired */ | |
992 | static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt) | |
993 | { | |
a73e4195 | 994 | struct rt6_info *pcpu_rt, **p; |
d52d3997 MKL |
995 | |
996 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
997 | pcpu_rt = *p; | |
998 | ||
a73e4195 MKL |
999 | if (pcpu_rt) { |
1000 | dst_hold(&pcpu_rt->dst); | |
1001 | rt6_dst_from_metrics_check(pcpu_rt); | |
1002 | } | |
1003 | return pcpu_rt; | |
1004 | } | |
1005 | ||
1006 | static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt) | |
1007 | { | |
9c7370a1 | 1008 | struct fib6_table *table = rt->rt6i_table; |
a73e4195 | 1009 | struct rt6_info *pcpu_rt, *prev, **p; |
d52d3997 MKL |
1010 | |
1011 | pcpu_rt = ip6_rt_pcpu_alloc(rt); | |
1012 | if (!pcpu_rt) { | |
1013 | struct net *net = dev_net(rt->dst.dev); | |
1014 | ||
9c7370a1 MKL |
1015 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
1016 | return net->ipv6.ip6_null_entry; | |
d52d3997 MKL |
1017 | } |
1018 | ||
9c7370a1 MKL |
1019 | read_lock_bh(&table->tb6_lock); |
1020 | if (rt->rt6i_pcpu) { | |
1021 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1022 | prev = cmpxchg(p, NULL, pcpu_rt); | |
1023 | if (prev) { | |
1024 | /* If someone did it before us, return prev instead */ | |
1025 | dst_destroy(&pcpu_rt->dst); | |
1026 | pcpu_rt = prev; | |
1027 | } | |
1028 | } else { | |
1029 | /* rt has been removed from the fib6 tree | |
1030 | * before we have a chance to acquire the read_lock. | |
1031 | * In this case, don't brother to create a pcpu rt | |
1032 | * since rt is going away anyway. The next | |
1033 | * dst_check() will trigger a re-lookup. | |
1034 | */ | |
d52d3997 | 1035 | dst_destroy(&pcpu_rt->dst); |
9c7370a1 | 1036 | pcpu_rt = rt; |
d52d3997 | 1037 | } |
d52d3997 MKL |
1038 | dst_hold(&pcpu_rt->dst); |
1039 | rt6_dst_from_metrics_check(pcpu_rt); | |
9c7370a1 | 1040 | read_unlock_bh(&table->tb6_lock); |
d52d3997 MKL |
1041 | return pcpu_rt; |
1042 | } | |
1043 | ||
8ed67789 | 1044 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 1045 | struct flowi6 *fl6, int flags) |
1da177e4 | 1046 | { |
367efcb9 | 1047 | struct fib6_node *fn, *saved_fn; |
45e4fd26 | 1048 | struct rt6_info *rt; |
c71099ac | 1049 | int strict = 0; |
1da177e4 | 1050 | |
77d16f45 | 1051 | strict |= flags & RT6_LOOKUP_F_IFACE; |
367efcb9 MKL |
1052 | if (net->ipv6.devconf_all->forwarding == 0) |
1053 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1da177e4 | 1054 | |
c71099ac | 1055 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 1056 | |
4c9483b2 | 1057 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 1058 | saved_fn = fn; |
1da177e4 | 1059 | |
ca254490 DA |
1060 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1061 | oif = 0; | |
1062 | ||
a3c00e46 | 1063 | redo_rt6_select: |
367efcb9 | 1064 | rt = rt6_select(fn, oif, strict); |
52bd4c0c | 1065 | if (rt->rt6i_nsiblings) |
367efcb9 | 1066 | rt = rt6_multipath_select(rt, fl6, oif, strict); |
a3c00e46 MKL |
1067 | if (rt == net->ipv6.ip6_null_entry) { |
1068 | fn = fib6_backtrack(fn, &fl6->saddr); | |
1069 | if (fn) | |
1070 | goto redo_rt6_select; | |
367efcb9 MKL |
1071 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
1072 | /* also consider unreachable route */ | |
1073 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
1074 | fn = saved_fn; | |
1075 | goto redo_rt6_select; | |
367efcb9 | 1076 | } |
a3c00e46 MKL |
1077 | } |
1078 | ||
fb9de91e | 1079 | |
3da59bd9 | 1080 | if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) { |
d52d3997 MKL |
1081 | dst_use(&rt->dst, jiffies); |
1082 | read_unlock_bh(&table->tb6_lock); | |
1083 | ||
1084 | rt6_dst_from_metrics_check(rt); | |
b811580d DA |
1085 | |
1086 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); | |
d52d3997 | 1087 | return rt; |
3da59bd9 MKL |
1088 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
1089 | !(rt->rt6i_flags & RTF_GATEWAY))) { | |
1090 | /* Create a RTF_CACHE clone which will not be | |
1091 | * owned by the fib6 tree. It is for the special case where | |
1092 | * the daddr in the skb during the neighbor look-up is different | |
1093 | * from the fl6->daddr used to look-up route here. | |
1094 | */ | |
1095 | ||
1096 | struct rt6_info *uncached_rt; | |
1097 | ||
d52d3997 MKL |
1098 | dst_use(&rt->dst, jiffies); |
1099 | read_unlock_bh(&table->tb6_lock); | |
1100 | ||
3da59bd9 MKL |
1101 | uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL); |
1102 | dst_release(&rt->dst); | |
c71099ac | 1103 | |
3da59bd9 | 1104 | if (uncached_rt) |
8d0b94af | 1105 | rt6_uncached_list_add(uncached_rt); |
3da59bd9 MKL |
1106 | else |
1107 | uncached_rt = net->ipv6.ip6_null_entry; | |
d52d3997 | 1108 | |
3da59bd9 | 1109 | dst_hold(&uncached_rt->dst); |
b811580d DA |
1110 | |
1111 | trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6); | |
3da59bd9 | 1112 | return uncached_rt; |
3da59bd9 | 1113 | |
d52d3997 MKL |
1114 | } else { |
1115 | /* Get a percpu copy */ | |
1116 | ||
1117 | struct rt6_info *pcpu_rt; | |
1118 | ||
1119 | rt->dst.lastuse = jiffies; | |
1120 | rt->dst.__use++; | |
1121 | pcpu_rt = rt6_get_pcpu_route(rt); | |
d52d3997 | 1122 | |
9c7370a1 MKL |
1123 | if (pcpu_rt) { |
1124 | read_unlock_bh(&table->tb6_lock); | |
1125 | } else { | |
1126 | /* We have to do the read_unlock first | |
1127 | * because rt6_make_pcpu_route() may trigger | |
1128 | * ip6_dst_gc() which will take the write_lock. | |
1129 | */ | |
1130 | dst_hold(&rt->dst); | |
1131 | read_unlock_bh(&table->tb6_lock); | |
a73e4195 | 1132 | pcpu_rt = rt6_make_pcpu_route(rt); |
9c7370a1 MKL |
1133 | dst_release(&rt->dst); |
1134 | } | |
d52d3997 | 1135 | |
b811580d | 1136 | trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6); |
d52d3997 | 1137 | return pcpu_rt; |
9c7370a1 | 1138 | |
d52d3997 | 1139 | } |
1da177e4 LT |
1140 | } |
1141 | ||
8ed67789 | 1142 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 1143 | struct flowi6 *fl6, int flags) |
4acad72d | 1144 | { |
4c9483b2 | 1145 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
1146 | } |
1147 | ||
72331bc0 SL |
1148 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
1149 | struct net_device *dev, | |
1150 | struct flowi6 *fl6, int flags) | |
1151 | { | |
1152 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1153 | flags |= RT6_LOOKUP_F_IFACE; | |
1154 | ||
1155 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1156 | } | |
1157 | ||
c71099ac TG |
1158 | void ip6_route_input(struct sk_buff *skb) |
1159 | { | |
b71d1d42 | 1160 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1161 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1162 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
904af04d | 1163 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 1164 | struct flowi6 fl6 = { |
ca254490 | 1165 | .flowi6_iif = l3mdev_fib_oif(skb->dev), |
4c9483b2 DM |
1166 | .daddr = iph->daddr, |
1167 | .saddr = iph->saddr, | |
6502ca52 | 1168 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1169 | .flowi6_mark = skb->mark, |
1170 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1171 | }; |
adaa70bb | 1172 | |
904af04d | 1173 | tun_info = skb_tunnel_info(skb); |
46fa062a | 1174 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 1175 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
06e9d040 | 1176 | skb_dst_drop(skb); |
72331bc0 | 1177 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1178 | } |
1179 | ||
8ed67789 | 1180 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1181 | struct flowi6 *fl6, int flags) |
1da177e4 | 1182 | { |
4c9483b2 | 1183 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1184 | } |
1185 | ||
6f21c96a PA |
1186 | struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, |
1187 | struct flowi6 *fl6, int flags) | |
c71099ac | 1188 | { |
ca254490 | 1189 | struct dst_entry *dst; |
d46a9d67 | 1190 | bool any_src; |
c71099ac | 1191 | |
ca254490 DA |
1192 | dst = l3mdev_rt6_dst_by_oif(net, fl6); |
1193 | if (dst) | |
1194 | return dst; | |
1195 | ||
1fb9489b | 1196 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1197 | |
d46a9d67 | 1198 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 1199 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 1200 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 1201 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1202 | |
d46a9d67 | 1203 | if (!any_src) |
adaa70bb | 1204 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1205 | else if (sk) |
1206 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1207 | |
4c9483b2 | 1208 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 | 1209 | } |
6f21c96a | 1210 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 1211 | |
2774c131 | 1212 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1213 | { |
5c1e6aa3 | 1214 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1215 | struct dst_entry *new = NULL; |
1216 | ||
f5b0a874 | 1217 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1218 | if (rt) { |
0a1f5962 | 1219 | rt6_info_init(rt); |
8104891b | 1220 | |
0a1f5962 | 1221 | new = &rt->dst; |
14e50e57 | 1222 | new->__use = 1; |
352e512c | 1223 | new->input = dst_discard; |
ede2059d | 1224 | new->output = dst_discard_out; |
14e50e57 | 1225 | |
0a1f5962 | 1226 | dst_copy_metrics(new, &ort->dst); |
14e50e57 DM |
1227 | rt->rt6i_idev = ort->rt6i_idev; |
1228 | if (rt->rt6i_idev) | |
1229 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1230 | |
4e3fd7a0 | 1231 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 1232 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
1233 | rt->rt6i_metric = 0; |
1234 | ||
1235 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1236 | #ifdef CONFIG_IPV6_SUBTREES | |
1237 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1238 | #endif | |
1239 | ||
1240 | dst_free(new); | |
1241 | } | |
1242 | ||
69ead7af DM |
1243 | dst_release(dst_orig); |
1244 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1245 | } |
14e50e57 | 1246 | |
1da177e4 LT |
1247 | /* |
1248 | * Destination cache support functions | |
1249 | */ | |
1250 | ||
4b32b5ad MKL |
1251 | static void rt6_dst_from_metrics_check(struct rt6_info *rt) |
1252 | { | |
1253 | if (rt->dst.from && | |
1254 | dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from)) | |
1255 | dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true); | |
1256 | } | |
1257 | ||
3da59bd9 MKL |
1258 | static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie) |
1259 | { | |
1260 | if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) | |
1261 | return NULL; | |
1262 | ||
1263 | if (rt6_check_expired(rt)) | |
1264 | return NULL; | |
1265 | ||
1266 | return &rt->dst; | |
1267 | } | |
1268 | ||
1269 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie) | |
1270 | { | |
5973fb1e MKL |
1271 | if (!__rt6_check_expired(rt) && |
1272 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
3da59bd9 MKL |
1273 | rt6_check((struct rt6_info *)(rt->dst.from), cookie)) |
1274 | return &rt->dst; | |
1275 | else | |
1276 | return NULL; | |
1277 | } | |
1278 | ||
1da177e4 LT |
1279 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
1280 | { | |
1281 | struct rt6_info *rt; | |
1282 | ||
1283 | rt = (struct rt6_info *) dst; | |
1284 | ||
6f3118b5 ND |
1285 | /* All IPV6 dsts are created with ->obsolete set to the value |
1286 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1287 | * into this function always. | |
1288 | */ | |
e3bc10bd | 1289 | |
4b32b5ad MKL |
1290 | rt6_dst_from_metrics_check(rt); |
1291 | ||
02bcf4e0 MKL |
1292 | if (rt->rt6i_flags & RTF_PCPU || |
1293 | (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from)) | |
3da59bd9 MKL |
1294 | return rt6_dst_from_check(rt, cookie); |
1295 | else | |
1296 | return rt6_check(rt, cookie); | |
1da177e4 LT |
1297 | } |
1298 | ||
1299 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1300 | { | |
1301 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1302 | ||
1303 | if (rt) { | |
54c1a859 YH |
1304 | if (rt->rt6i_flags & RTF_CACHE) { |
1305 | if (rt6_check_expired(rt)) { | |
1306 | ip6_del_rt(rt); | |
1307 | dst = NULL; | |
1308 | } | |
1309 | } else { | |
1da177e4 | 1310 | dst_release(dst); |
54c1a859 YH |
1311 | dst = NULL; |
1312 | } | |
1da177e4 | 1313 | } |
54c1a859 | 1314 | return dst; |
1da177e4 LT |
1315 | } |
1316 | ||
1317 | static void ip6_link_failure(struct sk_buff *skb) | |
1318 | { | |
1319 | struct rt6_info *rt; | |
1320 | ||
3ffe533c | 1321 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1322 | |
adf30907 | 1323 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1324 | if (rt) { |
1eb4f758 HFS |
1325 | if (rt->rt6i_flags & RTF_CACHE) { |
1326 | dst_hold(&rt->dst); | |
8e3d5be7 | 1327 | ip6_del_rt(rt); |
1eb4f758 | 1328 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { |
1da177e4 | 1329 | rt->rt6i_node->fn_sernum = -1; |
1eb4f758 | 1330 | } |
1da177e4 LT |
1331 | } |
1332 | } | |
1333 | ||
45e4fd26 MKL |
1334 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
1335 | { | |
1336 | struct net *net = dev_net(rt->dst.dev); | |
1337 | ||
1338 | rt->rt6i_flags |= RTF_MODIFIED; | |
1339 | rt->rt6i_pmtu = mtu; | |
1340 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
1341 | } | |
1342 | ||
0d3f6d29 MKL |
1343 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
1344 | { | |
1345 | return !(rt->rt6i_flags & RTF_CACHE) && | |
1346 | (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node); | |
1347 | } | |
1348 | ||
45e4fd26 MKL |
1349 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
1350 | const struct ipv6hdr *iph, u32 mtu) | |
1da177e4 | 1351 | { |
67ba4152 | 1352 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 1353 | |
45e4fd26 MKL |
1354 | if (rt6->rt6i_flags & RTF_LOCAL) |
1355 | return; | |
81aded24 | 1356 | |
45e4fd26 MKL |
1357 | dst_confirm(dst); |
1358 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); | |
1359 | if (mtu >= dst_mtu(dst)) | |
1360 | return; | |
9d289715 | 1361 | |
0d3f6d29 | 1362 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 MKL |
1363 | rt6_do_update_pmtu(rt6, mtu); |
1364 | } else { | |
1365 | const struct in6_addr *daddr, *saddr; | |
1366 | struct rt6_info *nrt6; | |
1367 | ||
1368 | if (iph) { | |
1369 | daddr = &iph->daddr; | |
1370 | saddr = &iph->saddr; | |
1371 | } else if (sk) { | |
1372 | daddr = &sk->sk_v6_daddr; | |
1373 | saddr = &inet6_sk(sk)->saddr; | |
1374 | } else { | |
1375 | return; | |
1376 | } | |
1377 | nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr); | |
1378 | if (nrt6) { | |
1379 | rt6_do_update_pmtu(nrt6, mtu); | |
1380 | ||
1381 | /* ip6_ins_rt(nrt6) will bump the | |
1382 | * rt6->rt6i_node->fn_sernum | |
1383 | * which will fail the next rt6_check() and | |
1384 | * invalidate the sk->sk_dst_cache. | |
1385 | */ | |
1386 | ip6_ins_rt(nrt6); | |
1387 | } | |
1da177e4 LT |
1388 | } |
1389 | } | |
1390 | ||
45e4fd26 MKL |
1391 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1392 | struct sk_buff *skb, u32 mtu) | |
1393 | { | |
1394 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu); | |
1395 | } | |
1396 | ||
42ae66c8 DM |
1397 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
1398 | int oif, u32 mark) | |
81aded24 DM |
1399 | { |
1400 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1401 | struct dst_entry *dst; | |
1402 | struct flowi6 fl6; | |
1403 | ||
1404 | memset(&fl6, 0, sizeof(fl6)); | |
1405 | fl6.flowi6_oif = oif; | |
1b3c61dc | 1406 | fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); |
81aded24 DM |
1407 | fl6.daddr = iph->daddr; |
1408 | fl6.saddr = iph->saddr; | |
6502ca52 | 1409 | fl6.flowlabel = ip6_flowinfo(iph); |
81aded24 DM |
1410 | |
1411 | dst = ip6_route_output(net, NULL, &fl6); | |
1412 | if (!dst->error) | |
45e4fd26 | 1413 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu)); |
81aded24 DM |
1414 | dst_release(dst); |
1415 | } | |
1416 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1417 | ||
1418 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1419 | { | |
1420 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
1421 | sk->sk_bound_dev_if, sk->sk_mark); | |
1422 | } | |
1423 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1424 | ||
b55b76b2 DJ |
1425 | /* Handle redirects */ |
1426 | struct ip6rd_flowi { | |
1427 | struct flowi6 fl6; | |
1428 | struct in6_addr gateway; | |
1429 | }; | |
1430 | ||
1431 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
1432 | struct fib6_table *table, | |
1433 | struct flowi6 *fl6, | |
1434 | int flags) | |
1435 | { | |
1436 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
1437 | struct rt6_info *rt; | |
1438 | struct fib6_node *fn; | |
1439 | ||
1440 | /* Get the "current" route for this destination and | |
1441 | * check if the redirect has come from approriate router. | |
1442 | * | |
1443 | * RFC 4861 specifies that redirects should only be | |
1444 | * accepted if they come from the nexthop to the target. | |
1445 | * Due to the way the routes are chosen, this notion | |
1446 | * is a bit fuzzy and one might need to check all possible | |
1447 | * routes. | |
1448 | */ | |
1449 | ||
1450 | read_lock_bh(&table->tb6_lock); | |
1451 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); | |
1452 | restart: | |
1453 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { | |
1454 | if (rt6_check_expired(rt)) | |
1455 | continue; | |
1456 | if (rt->dst.error) | |
1457 | break; | |
1458 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1459 | continue; | |
1460 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) | |
1461 | continue; | |
1462 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) | |
1463 | continue; | |
1464 | break; | |
1465 | } | |
1466 | ||
1467 | if (!rt) | |
1468 | rt = net->ipv6.ip6_null_entry; | |
1469 | else if (rt->dst.error) { | |
1470 | rt = net->ipv6.ip6_null_entry; | |
b0a1ba59 MKL |
1471 | goto out; |
1472 | } | |
1473 | ||
1474 | if (rt == net->ipv6.ip6_null_entry) { | |
a3c00e46 MKL |
1475 | fn = fib6_backtrack(fn, &fl6->saddr); |
1476 | if (fn) | |
1477 | goto restart; | |
b55b76b2 | 1478 | } |
a3c00e46 | 1479 | |
b0a1ba59 | 1480 | out: |
b55b76b2 DJ |
1481 | dst_hold(&rt->dst); |
1482 | ||
1483 | read_unlock_bh(&table->tb6_lock); | |
1484 | ||
b811580d | 1485 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); |
b55b76b2 DJ |
1486 | return rt; |
1487 | }; | |
1488 | ||
1489 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
1490 | const struct flowi6 *fl6, | |
1491 | const struct in6_addr *gateway) | |
1492 | { | |
1493 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
1494 | struct ip6rd_flowi rdfl; | |
1495 | ||
1496 | rdfl.fl6 = *fl6; | |
1497 | rdfl.gateway = *gateway; | |
1498 | ||
1499 | return fib6_rule_lookup(net, &rdfl.fl6, | |
1500 | flags, __ip6_route_redirect); | |
1501 | } | |
1502 | ||
3a5ad2ee DM |
1503 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1504 | { | |
1505 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1506 | struct dst_entry *dst; | |
1507 | struct flowi6 fl6; | |
1508 | ||
1509 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1510 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
3a5ad2ee DM |
1511 | fl6.flowi6_oif = oif; |
1512 | fl6.flowi6_mark = mark; | |
3a5ad2ee DM |
1513 | fl6.daddr = iph->daddr; |
1514 | fl6.saddr = iph->saddr; | |
6502ca52 | 1515 | fl6.flowlabel = ip6_flowinfo(iph); |
3a5ad2ee | 1516 | |
b55b76b2 DJ |
1517 | dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
1518 | rt6_do_redirect(dst, NULL, skb); | |
3a5ad2ee DM |
1519 | dst_release(dst); |
1520 | } | |
1521 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1522 | ||
c92a59ec DJ |
1523 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
1524 | u32 mark) | |
1525 | { | |
1526 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1527 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
1528 | struct dst_entry *dst; | |
1529 | struct flowi6 fl6; | |
1530 | ||
1531 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1532 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
c92a59ec DJ |
1533 | fl6.flowi6_oif = oif; |
1534 | fl6.flowi6_mark = mark; | |
c92a59ec DJ |
1535 | fl6.daddr = msg->dest; |
1536 | fl6.saddr = iph->daddr; | |
1537 | ||
b55b76b2 DJ |
1538 | dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
1539 | rt6_do_redirect(dst, NULL, skb); | |
c92a59ec DJ |
1540 | dst_release(dst); |
1541 | } | |
1542 | ||
3a5ad2ee DM |
1543 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
1544 | { | |
1545 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1546 | } | |
1547 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1548 | ||
0dbaee3b | 1549 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1550 | { |
0dbaee3b DM |
1551 | struct net_device *dev = dst->dev; |
1552 | unsigned int mtu = dst_mtu(dst); | |
1553 | struct net *net = dev_net(dev); | |
1554 | ||
1da177e4 LT |
1555 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1556 | ||
5578689a DL |
1557 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1558 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1559 | |
1560 | /* | |
1ab1457c YH |
1561 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1562 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1563 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1564 | * rely only on pmtu discovery" |
1565 | */ | |
1566 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1567 | mtu = IPV6_MAXPLEN; | |
1568 | return mtu; | |
1569 | } | |
1570 | ||
ebb762f2 | 1571 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1572 | { |
4b32b5ad MKL |
1573 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
1574 | unsigned int mtu = rt->rt6i_pmtu; | |
d33e4553 | 1575 | struct inet6_dev *idev; |
618f9bc7 | 1576 | |
4b32b5ad MKL |
1577 | if (mtu) |
1578 | goto out; | |
1579 | ||
1580 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 1581 | if (mtu) |
30f78d8e | 1582 | goto out; |
618f9bc7 SK |
1583 | |
1584 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1585 | |
1586 | rcu_read_lock(); | |
1587 | idev = __in6_dev_get(dst->dev); | |
1588 | if (idev) | |
1589 | mtu = idev->cnf.mtu6; | |
1590 | rcu_read_unlock(); | |
1591 | ||
30f78d8e ED |
1592 | out: |
1593 | return min_t(unsigned int, mtu, IP6_MAX_MTU); | |
d33e4553 DM |
1594 | } |
1595 | ||
3b00944c YH |
1596 | static struct dst_entry *icmp6_dst_gc_list; |
1597 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1598 | |
3b00944c | 1599 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1600 | struct flowi6 *fl6) |
1da177e4 | 1601 | { |
87a11578 | 1602 | struct dst_entry *dst; |
1da177e4 LT |
1603 | struct rt6_info *rt; |
1604 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1605 | struct net *net = dev_net(dev); |
1da177e4 | 1606 | |
38308473 | 1607 | if (unlikely(!idev)) |
122bdf67 | 1608 | return ERR_PTR(-ENODEV); |
1da177e4 | 1609 | |
ad706862 | 1610 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 1611 | if (unlikely(!rt)) { |
1da177e4 | 1612 | in6_dev_put(idev); |
87a11578 | 1613 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1614 | goto out; |
1615 | } | |
1616 | ||
8e2ec639 YZ |
1617 | rt->dst.flags |= DST_HOST; |
1618 | rt->dst.output = ip6_output; | |
d8d1f30b | 1619 | atomic_set(&rt->dst.__refcnt, 1); |
550bab42 | 1620 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 1621 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1622 | rt->rt6i_dst.plen = 128; |
1623 | rt->rt6i_idev = idev; | |
14edd87d | 1624 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1625 | |
3b00944c | 1626 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1627 | rt->dst.next = icmp6_dst_gc_list; |
1628 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1629 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1630 | |
5578689a | 1631 | fib6_force_start_gc(net); |
1da177e4 | 1632 | |
87a11578 DM |
1633 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1634 | ||
1da177e4 | 1635 | out: |
87a11578 | 1636 | return dst; |
1da177e4 LT |
1637 | } |
1638 | ||
3d0f24a7 | 1639 | int icmp6_dst_gc(void) |
1da177e4 | 1640 | { |
e9476e95 | 1641 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1642 | int more = 0; |
1da177e4 | 1643 | |
3b00944c YH |
1644 | spin_lock_bh(&icmp6_dst_lock); |
1645 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1646 | |
1da177e4 LT |
1647 | while ((dst = *pprev) != NULL) { |
1648 | if (!atomic_read(&dst->__refcnt)) { | |
1649 | *pprev = dst->next; | |
1650 | dst_free(dst); | |
1da177e4 LT |
1651 | } else { |
1652 | pprev = &dst->next; | |
3d0f24a7 | 1653 | ++more; |
1da177e4 LT |
1654 | } |
1655 | } | |
1656 | ||
3b00944c | 1657 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1658 | |
3d0f24a7 | 1659 | return more; |
1da177e4 LT |
1660 | } |
1661 | ||
1e493d19 DM |
1662 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1663 | void *arg) | |
1664 | { | |
1665 | struct dst_entry *dst, **pprev; | |
1666 | ||
1667 | spin_lock_bh(&icmp6_dst_lock); | |
1668 | pprev = &icmp6_dst_gc_list; | |
1669 | while ((dst = *pprev) != NULL) { | |
1670 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1671 | if (func(rt, arg)) { | |
1672 | *pprev = dst->next; | |
1673 | dst_free(dst); | |
1674 | } else { | |
1675 | pprev = &dst->next; | |
1676 | } | |
1677 | } | |
1678 | spin_unlock_bh(&icmp6_dst_lock); | |
1679 | } | |
1680 | ||
569d3645 | 1681 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1682 | { |
86393e52 | 1683 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1684 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1685 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1686 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1687 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1688 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1689 | int entries; |
7019b78e | 1690 | |
fc66f95c | 1691 | entries = dst_entries_get_fast(ops); |
49a18d86 | 1692 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 1693 | entries <= rt_max_size) |
1da177e4 LT |
1694 | goto out; |
1695 | ||
6891a346 | 1696 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 1697 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
1698 | entries = dst_entries_get_slow(ops); |
1699 | if (entries < ops->gc_thresh) | |
7019b78e | 1700 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1701 | out: |
7019b78e | 1702 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1703 | return entries > rt_max_size; |
1da177e4 LT |
1704 | } |
1705 | ||
e715b6d3 FW |
1706 | static int ip6_convert_metrics(struct mx6_config *mxc, |
1707 | const struct fib6_config *cfg) | |
1708 | { | |
c3a8d947 | 1709 | bool ecn_ca = false; |
e715b6d3 FW |
1710 | struct nlattr *nla; |
1711 | int remaining; | |
1712 | u32 *mp; | |
1713 | ||
63159f29 | 1714 | if (!cfg->fc_mx) |
e715b6d3 FW |
1715 | return 0; |
1716 | ||
1717 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1718 | if (unlikely(!mp)) | |
1719 | return -ENOMEM; | |
1720 | ||
1721 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1722 | int type = nla_type(nla); | |
1bb14807 | 1723 | u32 val; |
e715b6d3 | 1724 | |
1bb14807 DB |
1725 | if (!type) |
1726 | continue; | |
1727 | if (unlikely(type > RTAX_MAX)) | |
1728 | goto err; | |
ea697639 | 1729 | |
1bb14807 DB |
1730 | if (type == RTAX_CC_ALGO) { |
1731 | char tmp[TCP_CA_NAME_MAX]; | |
e715b6d3 | 1732 | |
1bb14807 | 1733 | nla_strlcpy(tmp, nla, sizeof(tmp)); |
c3a8d947 | 1734 | val = tcp_ca_get_key_by_name(tmp, &ecn_ca); |
1bb14807 DB |
1735 | if (val == TCP_CA_UNSPEC) |
1736 | goto err; | |
1737 | } else { | |
1738 | val = nla_get_u32(nla); | |
e715b6d3 | 1739 | } |
b8d3e416 DB |
1740 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
1741 | goto err; | |
1bb14807 DB |
1742 | |
1743 | mp[type - 1] = val; | |
1744 | __set_bit(type - 1, mxc->mx_valid); | |
e715b6d3 FW |
1745 | } |
1746 | ||
c3a8d947 DB |
1747 | if (ecn_ca) { |
1748 | __set_bit(RTAX_FEATURES - 1, mxc->mx_valid); | |
1749 | mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; | |
1750 | } | |
e715b6d3 | 1751 | |
c3a8d947 | 1752 | mxc->mx = mp; |
e715b6d3 FW |
1753 | return 0; |
1754 | err: | |
1755 | kfree(mp); | |
1756 | return -EINVAL; | |
1757 | } | |
1da177e4 | 1758 | |
8c5b83f0 | 1759 | static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg) |
1da177e4 | 1760 | { |
5578689a | 1761 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1762 | struct rt6_info *rt = NULL; |
1763 | struct net_device *dev = NULL; | |
1764 | struct inet6_dev *idev = NULL; | |
c71099ac | 1765 | struct fib6_table *table; |
1da177e4 | 1766 | int addr_type; |
8c5b83f0 | 1767 | int err = -EINVAL; |
1da177e4 | 1768 | |
86872cb5 | 1769 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
8c5b83f0 | 1770 | goto out; |
1da177e4 | 1771 | #ifndef CONFIG_IPV6_SUBTREES |
86872cb5 | 1772 | if (cfg->fc_src_len) |
8c5b83f0 | 1773 | goto out; |
1da177e4 | 1774 | #endif |
86872cb5 | 1775 | if (cfg->fc_ifindex) { |
1da177e4 | 1776 | err = -ENODEV; |
5578689a | 1777 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1778 | if (!dev) |
1779 | goto out; | |
1780 | idev = in6_dev_get(dev); | |
1781 | if (!idev) | |
1782 | goto out; | |
1783 | } | |
1784 | ||
86872cb5 TG |
1785 | if (cfg->fc_metric == 0) |
1786 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1787 | |
d71314b4 | 1788 | err = -ENOBUFS; |
38308473 DM |
1789 | if (cfg->fc_nlinfo.nlh && |
1790 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1791 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1792 | if (!table) { |
f3213831 | 1793 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1794 | table = fib6_new_table(net, cfg->fc_table); |
1795 | } | |
1796 | } else { | |
1797 | table = fib6_new_table(net, cfg->fc_table); | |
1798 | } | |
38308473 DM |
1799 | |
1800 | if (!table) | |
c71099ac | 1801 | goto out; |
c71099ac | 1802 | |
ad706862 MKL |
1803 | rt = ip6_dst_alloc(net, NULL, |
1804 | (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT); | |
1da177e4 | 1805 | |
38308473 | 1806 | if (!rt) { |
1da177e4 LT |
1807 | err = -ENOMEM; |
1808 | goto out; | |
1809 | } | |
1810 | ||
1716a961 G |
1811 | if (cfg->fc_flags & RTF_EXPIRES) |
1812 | rt6_set_expires(rt, jiffies + | |
1813 | clock_t_to_jiffies(cfg->fc_expires)); | |
1814 | else | |
1815 | rt6_clean_expires(rt); | |
1da177e4 | 1816 | |
86872cb5 TG |
1817 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1818 | cfg->fc_protocol = RTPROT_BOOT; | |
1819 | rt->rt6i_protocol = cfg->fc_protocol; | |
1820 | ||
1821 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1822 | |
1823 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1824 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1825 | else if (cfg->fc_flags & RTF_LOCAL) |
1826 | rt->dst.input = ip6_input; | |
1da177e4 | 1827 | else |
d8d1f30b | 1828 | rt->dst.input = ip6_forward; |
1da177e4 | 1829 | |
d8d1f30b | 1830 | rt->dst.output = ip6_output; |
1da177e4 | 1831 | |
19e42e45 RP |
1832 | if (cfg->fc_encap) { |
1833 | struct lwtunnel_state *lwtstate; | |
1834 | ||
1835 | err = lwtunnel_build_state(dev, cfg->fc_encap_type, | |
127eb7cd TH |
1836 | cfg->fc_encap, AF_INET6, cfg, |
1837 | &lwtstate); | |
19e42e45 RP |
1838 | if (err) |
1839 | goto out; | |
61adedf3 JB |
1840 | rt->dst.lwtstate = lwtstate_get(lwtstate); |
1841 | if (lwtunnel_output_redirect(rt->dst.lwtstate)) { | |
1842 | rt->dst.lwtstate->orig_output = rt->dst.output; | |
1843 | rt->dst.output = lwtunnel_output; | |
25368623 | 1844 | } |
61adedf3 JB |
1845 | if (lwtunnel_input_redirect(rt->dst.lwtstate)) { |
1846 | rt->dst.lwtstate->orig_input = rt->dst.input; | |
1847 | rt->dst.input = lwtunnel_input; | |
25368623 | 1848 | } |
19e42e45 RP |
1849 | } |
1850 | ||
86872cb5 TG |
1851 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1852 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
afc4eef8 | 1853 | if (rt->rt6i_dst.plen == 128) |
e5fd387a | 1854 | rt->dst.flags |= DST_HOST; |
e5fd387a | 1855 | |
1da177e4 | 1856 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1857 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1858 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1859 | #endif |
1860 | ||
86872cb5 | 1861 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1862 | |
1863 | /* We cannot add true routes via loopback here, | |
1864 | they would result in kernel looping; promote them to reject routes | |
1865 | */ | |
86872cb5 | 1866 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1867 | (dev && (dev->flags & IFF_LOOPBACK) && |
1868 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1869 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1870 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1871 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1872 | if (dev) { |
1873 | dev_put(dev); | |
1874 | in6_dev_put(idev); | |
1875 | } | |
5578689a | 1876 | dev = net->loopback_dev; |
1da177e4 LT |
1877 | dev_hold(dev); |
1878 | idev = in6_dev_get(dev); | |
1879 | if (!idev) { | |
1880 | err = -ENODEV; | |
1881 | goto out; | |
1882 | } | |
1883 | } | |
1da177e4 | 1884 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1885 | switch (cfg->fc_type) { |
1886 | case RTN_BLACKHOLE: | |
1887 | rt->dst.error = -EINVAL; | |
ede2059d | 1888 | rt->dst.output = dst_discard_out; |
7150aede | 1889 | rt->dst.input = dst_discard; |
ef2c7d7b ND |
1890 | break; |
1891 | case RTN_PROHIBIT: | |
1892 | rt->dst.error = -EACCES; | |
7150aede K |
1893 | rt->dst.output = ip6_pkt_prohibit_out; |
1894 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 1895 | break; |
b4949ab2 | 1896 | case RTN_THROW: |
0315e382 | 1897 | case RTN_UNREACHABLE: |
ef2c7d7b | 1898 | default: |
7150aede | 1899 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
0315e382 NF |
1900 | : (cfg->fc_type == RTN_UNREACHABLE) |
1901 | ? -EHOSTUNREACH : -ENETUNREACH; | |
7150aede K |
1902 | rt->dst.output = ip6_pkt_discard_out; |
1903 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
1904 | break; |
1905 | } | |
1da177e4 LT |
1906 | goto install_route; |
1907 | } | |
1908 | ||
86872cb5 | 1909 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1910 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1911 | int gwa_type; |
1912 | ||
86872cb5 | 1913 | gw_addr = &cfg->fc_gateway; |
330567b7 | 1914 | gwa_type = ipv6_addr_type(gw_addr); |
48ed7b26 FW |
1915 | |
1916 | /* if gw_addr is local we will fail to detect this in case | |
1917 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
1918 | * will return already-added prefix route via interface that | |
1919 | * prefix route was assigned to, which might be non-loopback. | |
1920 | */ | |
1921 | err = -EINVAL; | |
330567b7 FW |
1922 | if (ipv6_chk_addr_and_flags(net, gw_addr, |
1923 | gwa_type & IPV6_ADDR_LINKLOCAL ? | |
1924 | dev : NULL, 0, 0)) | |
48ed7b26 FW |
1925 | goto out; |
1926 | ||
4e3fd7a0 | 1927 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1928 | |
1929 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1930 | struct rt6_info *grt; | |
1931 | ||
1932 | /* IPv6 strictly inhibits using not link-local | |
1933 | addresses as nexthop address. | |
1934 | Otherwise, router will not able to send redirects. | |
1935 | It is very good, but in some (rare!) circumstances | |
1936 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1937 | some exceptions. --ANK | |
1938 | */ | |
38308473 | 1939 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1940 | goto out; |
1941 | ||
5578689a | 1942 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1943 | |
1944 | err = -EHOSTUNREACH; | |
38308473 | 1945 | if (!grt) |
1da177e4 LT |
1946 | goto out; |
1947 | if (dev) { | |
d1918542 | 1948 | if (dev != grt->dst.dev) { |
94e187c0 | 1949 | ip6_rt_put(grt); |
1da177e4 LT |
1950 | goto out; |
1951 | } | |
1952 | } else { | |
d1918542 | 1953 | dev = grt->dst.dev; |
1da177e4 LT |
1954 | idev = grt->rt6i_idev; |
1955 | dev_hold(dev); | |
1956 | in6_dev_hold(grt->rt6i_idev); | |
1957 | } | |
38308473 | 1958 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1959 | err = 0; |
94e187c0 | 1960 | ip6_rt_put(grt); |
1da177e4 LT |
1961 | |
1962 | if (err) | |
1963 | goto out; | |
1964 | } | |
1965 | err = -EINVAL; | |
38308473 | 1966 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1967 | goto out; |
1968 | } | |
1969 | ||
1970 | err = -ENODEV; | |
38308473 | 1971 | if (!dev) |
1da177e4 LT |
1972 | goto out; |
1973 | ||
c3968a85 DW |
1974 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1975 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1976 | err = -EINVAL; | |
1977 | goto out; | |
1978 | } | |
4e3fd7a0 | 1979 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1980 | rt->rt6i_prefsrc.plen = 128; |
1981 | } else | |
1982 | rt->rt6i_prefsrc.plen = 0; | |
1983 | ||
86872cb5 | 1984 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1985 | |
1986 | install_route: | |
d8d1f30b | 1987 | rt->dst.dev = dev; |
1da177e4 | 1988 | rt->rt6i_idev = idev; |
c71099ac | 1989 | rt->rt6i_table = table; |
63152fc0 | 1990 | |
c346dca1 | 1991 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1992 | |
8c5b83f0 | 1993 | return rt; |
6b9ea5a6 RP |
1994 | out: |
1995 | if (dev) | |
1996 | dev_put(dev); | |
1997 | if (idev) | |
1998 | in6_dev_put(idev); | |
1999 | if (rt) | |
2000 | dst_free(&rt->dst); | |
2001 | ||
8c5b83f0 | 2002 | return ERR_PTR(err); |
6b9ea5a6 RP |
2003 | } |
2004 | ||
2005 | int ip6_route_add(struct fib6_config *cfg) | |
2006 | { | |
2007 | struct mx6_config mxc = { .mx = NULL, }; | |
8c5b83f0 | 2008 | struct rt6_info *rt; |
6b9ea5a6 RP |
2009 | int err; |
2010 | ||
8c5b83f0 RP |
2011 | rt = ip6_route_info_create(cfg); |
2012 | if (IS_ERR(rt)) { | |
2013 | err = PTR_ERR(rt); | |
2014 | rt = NULL; | |
6b9ea5a6 | 2015 | goto out; |
8c5b83f0 | 2016 | } |
6b9ea5a6 | 2017 | |
e715b6d3 FW |
2018 | err = ip6_convert_metrics(&mxc, cfg); |
2019 | if (err) | |
2020 | goto out; | |
1da177e4 | 2021 | |
e715b6d3 FW |
2022 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc); |
2023 | ||
2024 | kfree(mxc.mx); | |
6b9ea5a6 | 2025 | |
e715b6d3 | 2026 | return err; |
1da177e4 | 2027 | out: |
1da177e4 | 2028 | if (rt) |
d8d1f30b | 2029 | dst_free(&rt->dst); |
6b9ea5a6 | 2030 | |
1da177e4 LT |
2031 | return err; |
2032 | } | |
2033 | ||
86872cb5 | 2034 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2035 | { |
2036 | int err; | |
c71099ac | 2037 | struct fib6_table *table; |
d1918542 | 2038 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 2039 | |
8e3d5be7 MKL |
2040 | if (rt == net->ipv6.ip6_null_entry || |
2041 | rt->dst.flags & DST_NOCACHE) { | |
6825a26c G |
2042 | err = -ENOENT; |
2043 | goto out; | |
2044 | } | |
6c813a72 | 2045 | |
c71099ac TG |
2046 | table = rt->rt6i_table; |
2047 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 2048 | err = fib6_del(rt, info); |
c71099ac | 2049 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 2050 | |
6825a26c | 2051 | out: |
94e187c0 | 2052 | ip6_rt_put(rt); |
1da177e4 LT |
2053 | return err; |
2054 | } | |
2055 | ||
e0a1ad73 TG |
2056 | int ip6_del_rt(struct rt6_info *rt) |
2057 | { | |
4d1169c1 | 2058 | struct nl_info info = { |
d1918542 | 2059 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 2060 | }; |
528c4ceb | 2061 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
2062 | } |
2063 | ||
86872cb5 | 2064 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 2065 | { |
c71099ac | 2066 | struct fib6_table *table; |
1da177e4 LT |
2067 | struct fib6_node *fn; |
2068 | struct rt6_info *rt; | |
2069 | int err = -ESRCH; | |
2070 | ||
5578689a | 2071 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 2072 | if (!table) |
c71099ac TG |
2073 | return err; |
2074 | ||
2075 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 2076 | |
c71099ac | 2077 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
2078 | &cfg->fc_dst, cfg->fc_dst_len, |
2079 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 2080 | |
1da177e4 | 2081 | if (fn) { |
d8d1f30b | 2082 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
1f56a01f MKL |
2083 | if ((rt->rt6i_flags & RTF_CACHE) && |
2084 | !(cfg->fc_flags & RTF_CACHE)) | |
2085 | continue; | |
86872cb5 | 2086 | if (cfg->fc_ifindex && |
d1918542 DM |
2087 | (!rt->dst.dev || |
2088 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 2089 | continue; |
86872cb5 TG |
2090 | if (cfg->fc_flags & RTF_GATEWAY && |
2091 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 2092 | continue; |
86872cb5 | 2093 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 2094 | continue; |
d8d1f30b | 2095 | dst_hold(&rt->dst); |
c71099ac | 2096 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 2097 | |
86872cb5 | 2098 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
2099 | } |
2100 | } | |
c71099ac | 2101 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2102 | |
2103 | return err; | |
2104 | } | |
2105 | ||
6700c270 | 2106 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 2107 | { |
a6279458 | 2108 | struct netevent_redirect netevent; |
e8599ff4 | 2109 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
2110 | struct ndisc_options ndopts; |
2111 | struct inet6_dev *in6_dev; | |
2112 | struct neighbour *neigh; | |
71bcdba0 | 2113 | struct rd_msg *msg; |
6e157b6a DM |
2114 | int optlen, on_link; |
2115 | u8 *lladdr; | |
e8599ff4 | 2116 | |
29a3cad5 | 2117 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 2118 | optlen -= sizeof(*msg); |
e8599ff4 DM |
2119 | |
2120 | if (optlen < 0) { | |
6e157b6a | 2121 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
2122 | return; |
2123 | } | |
2124 | ||
71bcdba0 | 2125 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 2126 | |
71bcdba0 | 2127 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 2128 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
2129 | return; |
2130 | } | |
2131 | ||
6e157b6a | 2132 | on_link = 0; |
71bcdba0 | 2133 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 2134 | on_link = 1; |
71bcdba0 | 2135 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 2136 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 2137 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
2138 | return; |
2139 | } | |
2140 | ||
2141 | in6_dev = __in6_dev_get(skb->dev); | |
2142 | if (!in6_dev) | |
2143 | return; | |
2144 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
2145 | return; | |
2146 | ||
2147 | /* RFC2461 8.1: | |
2148 | * The IP source address of the Redirect MUST be the same as the current | |
2149 | * first-hop router for the specified ICMP Destination Address. | |
2150 | */ | |
2151 | ||
71bcdba0 | 2152 | if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
2153 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
2154 | return; | |
2155 | } | |
6e157b6a DM |
2156 | |
2157 | lladdr = NULL; | |
e8599ff4 DM |
2158 | if (ndopts.nd_opts_tgt_lladdr) { |
2159 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
2160 | skb->dev); | |
2161 | if (!lladdr) { | |
2162 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
2163 | return; | |
2164 | } | |
2165 | } | |
2166 | ||
6e157b6a | 2167 | rt = (struct rt6_info *) dst; |
ec13ad1d | 2168 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 2169 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 2170 | return; |
6e157b6a | 2171 | } |
e8599ff4 | 2172 | |
6e157b6a DM |
2173 | /* Redirect received -> path was valid. |
2174 | * Look, redirects are sent only in response to data packets, | |
2175 | * so that this nexthop apparently is reachable. --ANK | |
2176 | */ | |
2177 | dst_confirm(&rt->dst); | |
a6279458 | 2178 | |
71bcdba0 | 2179 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
2180 | if (!neigh) |
2181 | return; | |
a6279458 | 2182 | |
1da177e4 LT |
2183 | /* |
2184 | * We have finally decided to accept it. | |
2185 | */ | |
2186 | ||
1ab1457c | 2187 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
2188 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
2189 | NEIGH_UPDATE_F_OVERRIDE| | |
2190 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
2191 | NEIGH_UPDATE_F_ISROUTER)) | |
2192 | ); | |
2193 | ||
83a09abd | 2194 | nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL); |
38308473 | 2195 | if (!nrt) |
1da177e4 LT |
2196 | goto out; |
2197 | ||
2198 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
2199 | if (on_link) | |
2200 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
2201 | ||
4e3fd7a0 | 2202 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 2203 | |
40e22e8f | 2204 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
2205 | goto out; |
2206 | ||
d8d1f30b CG |
2207 | netevent.old = &rt->dst; |
2208 | netevent.new = &nrt->dst; | |
71bcdba0 | 2209 | netevent.daddr = &msg->dest; |
60592833 | 2210 | netevent.neigh = neigh; |
8d71740c TT |
2211 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
2212 | ||
38308473 | 2213 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 2214 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 2215 | ip6_del_rt(rt); |
1da177e4 LT |
2216 | } |
2217 | ||
2218 | out: | |
e8599ff4 | 2219 | neigh_release(neigh); |
6e157b6a DM |
2220 | } |
2221 | ||
1da177e4 LT |
2222 | /* |
2223 | * Misc support functions | |
2224 | */ | |
2225 | ||
4b32b5ad MKL |
2226 | static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) |
2227 | { | |
2228 | BUG_ON(from->dst.from); | |
2229 | ||
2230 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
2231 | dst_hold(&from->dst); | |
2232 | rt->dst.from = &from->dst; | |
2233 | dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true); | |
2234 | } | |
2235 | ||
83a09abd MKL |
2236 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort) |
2237 | { | |
2238 | rt->dst.input = ort->dst.input; | |
2239 | rt->dst.output = ort->dst.output; | |
2240 | rt->rt6i_dst = ort->rt6i_dst; | |
2241 | rt->dst.error = ort->dst.error; | |
2242 | rt->rt6i_idev = ort->rt6i_idev; | |
2243 | if (rt->rt6i_idev) | |
2244 | in6_dev_hold(rt->rt6i_idev); | |
2245 | rt->dst.lastuse = jiffies; | |
2246 | rt->rt6i_gateway = ort->rt6i_gateway; | |
2247 | rt->rt6i_flags = ort->rt6i_flags; | |
2248 | rt6_set_from(rt, ort); | |
2249 | rt->rt6i_metric = ort->rt6i_metric; | |
1da177e4 | 2250 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd | 2251 | rt->rt6i_src = ort->rt6i_src; |
1da177e4 | 2252 | #endif |
83a09abd MKL |
2253 | rt->rt6i_prefsrc = ort->rt6i_prefsrc; |
2254 | rt->rt6i_table = ort->rt6i_table; | |
61adedf3 | 2255 | rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate); |
1da177e4 LT |
2256 | } |
2257 | ||
70ceb4f5 | 2258 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 2259 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
2260 | const struct in6_addr *prefix, int prefixlen, |
2261 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
2262 | { |
2263 | struct fib6_node *fn; | |
2264 | struct rt6_info *rt = NULL; | |
c71099ac TG |
2265 | struct fib6_table *table; |
2266 | ||
efa2cea0 | 2267 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 2268 | if (!table) |
c71099ac | 2269 | return NULL; |
70ceb4f5 | 2270 | |
5744dd9b | 2271 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2272 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0); |
70ceb4f5 YH |
2273 | if (!fn) |
2274 | goto out; | |
2275 | ||
d8d1f30b | 2276 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2277 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
2278 | continue; |
2279 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
2280 | continue; | |
2281 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
2282 | continue; | |
d8d1f30b | 2283 | dst_hold(&rt->dst); |
70ceb4f5 YH |
2284 | break; |
2285 | } | |
2286 | out: | |
5744dd9b | 2287 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
2288 | return rt; |
2289 | } | |
2290 | ||
efa2cea0 | 2291 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
2292 | const struct in6_addr *prefix, int prefixlen, |
2293 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 2294 | unsigned int pref) |
70ceb4f5 | 2295 | { |
86872cb5 | 2296 | struct fib6_config cfg = { |
238fc7ea | 2297 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2298 | .fc_ifindex = ifindex, |
2299 | .fc_dst_len = prefixlen, | |
2300 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
2301 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 2302 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
2303 | .fc_nlinfo.nlh = NULL, |
2304 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
2305 | }; |
2306 | ||
ca254490 | 2307 | cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO; |
4e3fd7a0 AD |
2308 | cfg.fc_dst = *prefix; |
2309 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 2310 | |
e317da96 YH |
2311 | /* We should treat it as a default route if prefix length is 0. */ |
2312 | if (!prefixlen) | |
86872cb5 | 2313 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 2314 | |
86872cb5 | 2315 | ip6_route_add(&cfg); |
70ceb4f5 | 2316 | |
efa2cea0 | 2317 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
2318 | } |
2319 | #endif | |
2320 | ||
b71d1d42 | 2321 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 2322 | { |
1da177e4 | 2323 | struct rt6_info *rt; |
c71099ac | 2324 | struct fib6_table *table; |
1da177e4 | 2325 | |
c346dca1 | 2326 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 2327 | if (!table) |
c71099ac | 2328 | return NULL; |
1da177e4 | 2329 | |
5744dd9b | 2330 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2331 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2332 | if (dev == rt->dst.dev && |
045927ff | 2333 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
2334 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
2335 | break; | |
2336 | } | |
2337 | if (rt) | |
d8d1f30b | 2338 | dst_hold(&rt->dst); |
5744dd9b | 2339 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2340 | return rt; |
2341 | } | |
2342 | ||
b71d1d42 | 2343 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
2344 | struct net_device *dev, |
2345 | unsigned int pref) | |
1da177e4 | 2346 | { |
86872cb5 | 2347 | struct fib6_config cfg = { |
ca254490 | 2348 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
238fc7ea | 2349 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2350 | .fc_ifindex = dev->ifindex, |
2351 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
2352 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 2353 | .fc_nlinfo.portid = 0, |
5578689a | 2354 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 2355 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 2356 | }; |
1da177e4 | 2357 | |
4e3fd7a0 | 2358 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 2359 | |
86872cb5 | 2360 | ip6_route_add(&cfg); |
1da177e4 | 2361 | |
1da177e4 LT |
2362 | return rt6_get_dflt_router(gwaddr, dev); |
2363 | } | |
2364 | ||
7b4da532 | 2365 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
2366 | { |
2367 | struct rt6_info *rt; | |
c71099ac TG |
2368 | struct fib6_table *table; |
2369 | ||
2370 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 2371 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 2372 | if (!table) |
c71099ac | 2373 | return; |
1da177e4 LT |
2374 | |
2375 | restart: | |
c71099ac | 2376 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 2377 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
3e8b0ac3 LC |
2378 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
2379 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d8d1f30b | 2380 | dst_hold(&rt->dst); |
c71099ac | 2381 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 2382 | ip6_del_rt(rt); |
1da177e4 LT |
2383 | goto restart; |
2384 | } | |
2385 | } | |
c71099ac | 2386 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2387 | } |
2388 | ||
5578689a DL |
2389 | static void rtmsg_to_fib6_config(struct net *net, |
2390 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
2391 | struct fib6_config *cfg) |
2392 | { | |
2393 | memset(cfg, 0, sizeof(*cfg)); | |
2394 | ||
ca254490 DA |
2395 | cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? |
2396 | : RT6_TABLE_MAIN; | |
86872cb5 TG |
2397 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; |
2398 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
2399 | cfg->fc_expires = rtmsg->rtmsg_info; | |
2400 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
2401 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
2402 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
2403 | ||
5578689a | 2404 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 2405 | |
4e3fd7a0 AD |
2406 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2407 | cfg->fc_src = rtmsg->rtmsg_src; | |
2408 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2409 | } |
2410 | ||
5578689a | 2411 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2412 | { |
86872cb5 | 2413 | struct fib6_config cfg; |
1da177e4 LT |
2414 | struct in6_rtmsg rtmsg; |
2415 | int err; | |
2416 | ||
67ba4152 | 2417 | switch (cmd) { |
1da177e4 LT |
2418 | case SIOCADDRT: /* Add a route */ |
2419 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 2420 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2421 | return -EPERM; |
2422 | err = copy_from_user(&rtmsg, arg, | |
2423 | sizeof(struct in6_rtmsg)); | |
2424 | if (err) | |
2425 | return -EFAULT; | |
86872cb5 | 2426 | |
5578689a | 2427 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2428 | |
1da177e4 LT |
2429 | rtnl_lock(); |
2430 | switch (cmd) { | |
2431 | case SIOCADDRT: | |
86872cb5 | 2432 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2433 | break; |
2434 | case SIOCDELRT: | |
86872cb5 | 2435 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2436 | break; |
2437 | default: | |
2438 | err = -EINVAL; | |
2439 | } | |
2440 | rtnl_unlock(); | |
2441 | ||
2442 | return err; | |
3ff50b79 | 2443 | } |
1da177e4 LT |
2444 | |
2445 | return -EINVAL; | |
2446 | } | |
2447 | ||
2448 | /* | |
2449 | * Drop the packet on the floor | |
2450 | */ | |
2451 | ||
d5fdd6ba | 2452 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2453 | { |
612f09e8 | 2454 | int type; |
adf30907 | 2455 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2456 | switch (ipstats_mib_noroutes) { |
2457 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2458 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2459 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2460 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2461 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2462 | break; |
2463 | } | |
2464 | /* FALLTHROUGH */ | |
2465 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2466 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2467 | ipstats_mib_noroutes); | |
612f09e8 YH |
2468 | break; |
2469 | } | |
3ffe533c | 2470 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2471 | kfree_skb(skb); |
2472 | return 0; | |
2473 | } | |
2474 | ||
9ce8ade0 TG |
2475 | static int ip6_pkt_discard(struct sk_buff *skb) |
2476 | { | |
612f09e8 | 2477 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2478 | } |
2479 | ||
ede2059d | 2480 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 2481 | { |
adf30907 | 2482 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2483 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2484 | } |
2485 | ||
9ce8ade0 TG |
2486 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2487 | { | |
612f09e8 | 2488 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2489 | } |
2490 | ||
ede2059d | 2491 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 2492 | { |
adf30907 | 2493 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2494 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2495 | } |
2496 | ||
1da177e4 LT |
2497 | /* |
2498 | * Allocate a dst for local (unicast / anycast) address. | |
2499 | */ | |
2500 | ||
2501 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2502 | const struct in6_addr *addr, | |
8f031519 | 2503 | bool anycast) |
1da177e4 | 2504 | { |
ca254490 | 2505 | u32 tb_id; |
c346dca1 | 2506 | struct net *net = dev_net(idev->dev); |
a3300ef4 | 2507 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, |
ad706862 | 2508 | DST_NOCOUNT); |
a3300ef4 | 2509 | if (!rt) |
1da177e4 LT |
2510 | return ERR_PTR(-ENOMEM); |
2511 | ||
1da177e4 LT |
2512 | in6_dev_hold(idev); |
2513 | ||
11d53b49 | 2514 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2515 | rt->dst.input = ip6_input; |
2516 | rt->dst.output = ip6_output; | |
1da177e4 | 2517 | rt->rt6i_idev = idev; |
1da177e4 LT |
2518 | |
2519 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2520 | if (anycast) |
2521 | rt->rt6i_flags |= RTF_ANYCAST; | |
2522 | else | |
1da177e4 | 2523 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2524 | |
550bab42 | 2525 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 2526 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2527 | rt->rt6i_dst.plen = 128; |
ca254490 DA |
2528 | tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL; |
2529 | rt->rt6i_table = fib6_get_table(net, tb_id); | |
8e3d5be7 | 2530 | rt->dst.flags |= DST_NOCACHE; |
1da177e4 | 2531 | |
d8d1f30b | 2532 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2533 | |
2534 | return rt; | |
2535 | } | |
2536 | ||
c3968a85 DW |
2537 | int ip6_route_get_saddr(struct net *net, |
2538 | struct rt6_info *rt, | |
b71d1d42 | 2539 | const struct in6_addr *daddr, |
c3968a85 DW |
2540 | unsigned int prefs, |
2541 | struct in6_addr *saddr) | |
2542 | { | |
e16e888b MS |
2543 | struct inet6_dev *idev = |
2544 | rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL; | |
c3968a85 | 2545 | int err = 0; |
e16e888b | 2546 | if (rt && rt->rt6i_prefsrc.plen) |
4e3fd7a0 | 2547 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2548 | else |
2549 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2550 | daddr, prefs, saddr); | |
2551 | return err; | |
2552 | } | |
2553 | ||
2554 | /* remove deleted ip from prefsrc entries */ | |
2555 | struct arg_dev_net_ip { | |
2556 | struct net_device *dev; | |
2557 | struct net *net; | |
2558 | struct in6_addr *addr; | |
2559 | }; | |
2560 | ||
2561 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2562 | { | |
2563 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2564 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2565 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2566 | ||
d1918542 | 2567 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2568 | rt != net->ipv6.ip6_null_entry && |
2569 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2570 | /* remove prefsrc entry */ | |
2571 | rt->rt6i_prefsrc.plen = 0; | |
2572 | } | |
2573 | return 0; | |
2574 | } | |
2575 | ||
2576 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2577 | { | |
2578 | struct net *net = dev_net(ifp->idev->dev); | |
2579 | struct arg_dev_net_ip adni = { | |
2580 | .dev = ifp->idev->dev, | |
2581 | .net = net, | |
2582 | .addr = &ifp->addr, | |
2583 | }; | |
0c3584d5 | 2584 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
2585 | } |
2586 | ||
be7a010d DJ |
2587 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) |
2588 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) | |
2589 | ||
2590 | /* Remove routers and update dst entries when gateway turn into host. */ | |
2591 | static int fib6_clean_tohost(struct rt6_info *rt, void *arg) | |
2592 | { | |
2593 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
2594 | ||
2595 | if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) || | |
2596 | ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) && | |
2597 | ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { | |
2598 | return -1; | |
2599 | } | |
2600 | return 0; | |
2601 | } | |
2602 | ||
2603 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
2604 | { | |
2605 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
2606 | } | |
2607 | ||
8ed67789 DL |
2608 | struct arg_dev_net { |
2609 | struct net_device *dev; | |
2610 | struct net *net; | |
2611 | }; | |
2612 | ||
1da177e4 LT |
2613 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2614 | { | |
bc3ef660 | 2615 | const struct arg_dev_net *adn = arg; |
2616 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2617 | |
d1918542 | 2618 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2619 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2620 | return -1; |
c159d30c | 2621 | |
1da177e4 LT |
2622 | return 0; |
2623 | } | |
2624 | ||
f3db4851 | 2625 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2626 | { |
8ed67789 DL |
2627 | struct arg_dev_net adn = { |
2628 | .dev = dev, | |
2629 | .net = net, | |
2630 | }; | |
2631 | ||
0c3584d5 | 2632 | fib6_clean_all(net, fib6_ifdown, &adn); |
1e493d19 | 2633 | icmp6_clean_all(fib6_ifdown, &adn); |
e332bc67 EB |
2634 | if (dev) |
2635 | rt6_uncached_list_flush_dev(net, dev); | |
1da177e4 LT |
2636 | } |
2637 | ||
95c96174 | 2638 | struct rt6_mtu_change_arg { |
1da177e4 | 2639 | struct net_device *dev; |
95c96174 | 2640 | unsigned int mtu; |
1da177e4 LT |
2641 | }; |
2642 | ||
2643 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2644 | { | |
2645 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2646 | struct inet6_dev *idev; | |
2647 | ||
2648 | /* In IPv6 pmtu discovery is not optional, | |
2649 | so that RTAX_MTU lock cannot disable it. | |
2650 | We still use this lock to block changes | |
2651 | caused by addrconf/ndisc. | |
2652 | */ | |
2653 | ||
2654 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2655 | if (!idev) |
1da177e4 LT |
2656 | return 0; |
2657 | ||
2658 | /* For administrative MTU increase, there is no way to discover | |
2659 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2660 | Since RFC 1981 doesn't include administrative MTU increase | |
2661 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2662 | */ | |
2663 | /* | |
2664 | If new MTU is less than route PMTU, this new MTU will be the | |
2665 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2666 | decreases; if new MTU is greater than route PMTU, and the | |
2667 | old MTU is the lowest MTU in the path, update the route PMTU | |
2668 | to reflect the increase. In this case if the other nodes' MTU | |
2669 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2670 | PMTU discouvery. | |
2671 | */ | |
d1918542 | 2672 | if (rt->dst.dev == arg->dev && |
4b32b5ad MKL |
2673 | !dst_metric_locked(&rt->dst, RTAX_MTU)) { |
2674 | if (rt->rt6i_flags & RTF_CACHE) { | |
2675 | /* For RTF_CACHE with rt6i_pmtu == 0 | |
2676 | * (i.e. a redirected route), | |
2677 | * the metrics of its rt->dst.from has already | |
2678 | * been updated. | |
2679 | */ | |
2680 | if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu) | |
2681 | rt->rt6i_pmtu = arg->mtu; | |
2682 | } else if (dst_mtu(&rt->dst) >= arg->mtu || | |
2683 | (dst_mtu(&rt->dst) < arg->mtu && | |
2684 | dst_mtu(&rt->dst) == idev->cnf.mtu6)) { | |
2685 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); | |
2686 | } | |
566cfd8f | 2687 | } |
1da177e4 LT |
2688 | return 0; |
2689 | } | |
2690 | ||
95c96174 | 2691 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2692 | { |
c71099ac TG |
2693 | struct rt6_mtu_change_arg arg = { |
2694 | .dev = dev, | |
2695 | .mtu = mtu, | |
2696 | }; | |
1da177e4 | 2697 | |
0c3584d5 | 2698 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
2699 | } |
2700 | ||
ef7c79ed | 2701 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2702 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2703 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2704 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2705 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2706 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2707 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 2708 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
2709 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
2710 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 2711 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
86872cb5 TG |
2712 | }; |
2713 | ||
2714 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2715 | struct fib6_config *cfg) | |
1da177e4 | 2716 | { |
86872cb5 TG |
2717 | struct rtmsg *rtm; |
2718 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 2719 | unsigned int pref; |
86872cb5 | 2720 | int err; |
1da177e4 | 2721 | |
86872cb5 TG |
2722 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2723 | if (err < 0) | |
2724 | goto errout; | |
1da177e4 | 2725 | |
86872cb5 TG |
2726 | err = -EINVAL; |
2727 | rtm = nlmsg_data(nlh); | |
2728 | memset(cfg, 0, sizeof(*cfg)); | |
2729 | ||
2730 | cfg->fc_table = rtm->rtm_table; | |
2731 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2732 | cfg->fc_src_len = rtm->rtm_src_len; | |
2733 | cfg->fc_flags = RTF_UP; | |
2734 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2735 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2736 | |
ef2c7d7b ND |
2737 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2738 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2739 | rtm->rtm_type == RTN_PROHIBIT || |
2740 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2741 | cfg->fc_flags |= RTF_REJECT; |
2742 | ||
ab79ad14 MŻ |
2743 | if (rtm->rtm_type == RTN_LOCAL) |
2744 | cfg->fc_flags |= RTF_LOCAL; | |
2745 | ||
1f56a01f MKL |
2746 | if (rtm->rtm_flags & RTM_F_CLONED) |
2747 | cfg->fc_flags |= RTF_CACHE; | |
2748 | ||
15e47304 | 2749 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2750 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2751 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2752 | |
2753 | if (tb[RTA_GATEWAY]) { | |
67b61f6c | 2754 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 2755 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 2756 | } |
86872cb5 TG |
2757 | |
2758 | if (tb[RTA_DST]) { | |
2759 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2760 | ||
2761 | if (nla_len(tb[RTA_DST]) < plen) | |
2762 | goto errout; | |
2763 | ||
2764 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2765 | } |
86872cb5 TG |
2766 | |
2767 | if (tb[RTA_SRC]) { | |
2768 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2769 | ||
2770 | if (nla_len(tb[RTA_SRC]) < plen) | |
2771 | goto errout; | |
2772 | ||
2773 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2774 | } |
86872cb5 | 2775 | |
c3968a85 | 2776 | if (tb[RTA_PREFSRC]) |
67b61f6c | 2777 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 2778 | |
86872cb5 TG |
2779 | if (tb[RTA_OIF]) |
2780 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2781 | ||
2782 | if (tb[RTA_PRIORITY]) | |
2783 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2784 | ||
2785 | if (tb[RTA_METRICS]) { | |
2786 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2787 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2788 | } |
86872cb5 TG |
2789 | |
2790 | if (tb[RTA_TABLE]) | |
2791 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2792 | ||
51ebd318 ND |
2793 | if (tb[RTA_MULTIPATH]) { |
2794 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2795 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
2796 | } | |
2797 | ||
c78ba6d6 LR |
2798 | if (tb[RTA_PREF]) { |
2799 | pref = nla_get_u8(tb[RTA_PREF]); | |
2800 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
2801 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
2802 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
2803 | cfg->fc_flags |= RTF_PREF(pref); | |
2804 | } | |
2805 | ||
19e42e45 RP |
2806 | if (tb[RTA_ENCAP]) |
2807 | cfg->fc_encap = tb[RTA_ENCAP]; | |
2808 | ||
2809 | if (tb[RTA_ENCAP_TYPE]) | |
2810 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); | |
2811 | ||
32bc201e XL |
2812 | if (tb[RTA_EXPIRES]) { |
2813 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
2814 | ||
2815 | if (addrconf_finite_timeout(timeout)) { | |
2816 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
2817 | cfg->fc_flags |= RTF_EXPIRES; | |
2818 | } | |
2819 | } | |
2820 | ||
86872cb5 TG |
2821 | err = 0; |
2822 | errout: | |
2823 | return err; | |
1da177e4 LT |
2824 | } |
2825 | ||
6b9ea5a6 RP |
2826 | struct rt6_nh { |
2827 | struct rt6_info *rt6_info; | |
2828 | struct fib6_config r_cfg; | |
2829 | struct mx6_config mxc; | |
2830 | struct list_head next; | |
2831 | }; | |
2832 | ||
2833 | static void ip6_print_replace_route_err(struct list_head *rt6_nh_list) | |
2834 | { | |
2835 | struct rt6_nh *nh; | |
2836 | ||
2837 | list_for_each_entry(nh, rt6_nh_list, next) { | |
2838 | pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n", | |
2839 | &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway, | |
2840 | nh->r_cfg.fc_ifindex); | |
2841 | } | |
2842 | } | |
2843 | ||
2844 | static int ip6_route_info_append(struct list_head *rt6_nh_list, | |
2845 | struct rt6_info *rt, struct fib6_config *r_cfg) | |
2846 | { | |
2847 | struct rt6_nh *nh; | |
2848 | struct rt6_info *rtnh; | |
2849 | int err = -EEXIST; | |
2850 | ||
2851 | list_for_each_entry(nh, rt6_nh_list, next) { | |
2852 | /* check if rt6_info already exists */ | |
2853 | rtnh = nh->rt6_info; | |
2854 | ||
2855 | if (rtnh->dst.dev == rt->dst.dev && | |
2856 | rtnh->rt6i_idev == rt->rt6i_idev && | |
2857 | ipv6_addr_equal(&rtnh->rt6i_gateway, | |
2858 | &rt->rt6i_gateway)) | |
2859 | return err; | |
2860 | } | |
2861 | ||
2862 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
2863 | if (!nh) | |
2864 | return -ENOMEM; | |
2865 | nh->rt6_info = rt; | |
2866 | err = ip6_convert_metrics(&nh->mxc, r_cfg); | |
2867 | if (err) { | |
2868 | kfree(nh); | |
2869 | return err; | |
2870 | } | |
2871 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); | |
2872 | list_add_tail(&nh->next, rt6_nh_list); | |
2873 | ||
2874 | return 0; | |
2875 | } | |
2876 | ||
2877 | static int ip6_route_multipath_add(struct fib6_config *cfg) | |
51ebd318 ND |
2878 | { |
2879 | struct fib6_config r_cfg; | |
2880 | struct rtnexthop *rtnh; | |
6b9ea5a6 RP |
2881 | struct rt6_info *rt; |
2882 | struct rt6_nh *err_nh; | |
2883 | struct rt6_nh *nh, *nh_safe; | |
51ebd318 ND |
2884 | int remaining; |
2885 | int attrlen; | |
6b9ea5a6 RP |
2886 | int err = 1; |
2887 | int nhn = 0; | |
2888 | int replace = (cfg->fc_nlinfo.nlh && | |
2889 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
2890 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 2891 | |
35f1b4e9 | 2892 | remaining = cfg->fc_mp_len; |
51ebd318 | 2893 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 2894 | |
6b9ea5a6 RP |
2895 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
2896 | * rt6_info structs per nexthop | |
2897 | */ | |
51ebd318 ND |
2898 | while (rtnh_ok(rtnh, remaining)) { |
2899 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2900 | if (rtnh->rtnh_ifindex) | |
2901 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2902 | ||
2903 | attrlen = rtnh_attrlen(rtnh); | |
2904 | if (attrlen > 0) { | |
2905 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2906 | ||
2907 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2908 | if (nla) { | |
67b61f6c | 2909 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
2910 | r_cfg.fc_flags |= RTF_GATEWAY; |
2911 | } | |
19e42e45 RP |
2912 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
2913 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
2914 | if (nla) | |
2915 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 2916 | } |
6b9ea5a6 | 2917 | |
8c5b83f0 RP |
2918 | rt = ip6_route_info_create(&r_cfg); |
2919 | if (IS_ERR(rt)) { | |
2920 | err = PTR_ERR(rt); | |
2921 | rt = NULL; | |
6b9ea5a6 | 2922 | goto cleanup; |
8c5b83f0 | 2923 | } |
6b9ea5a6 RP |
2924 | |
2925 | err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg); | |
51ebd318 | 2926 | if (err) { |
6b9ea5a6 RP |
2927 | dst_free(&rt->dst); |
2928 | goto cleanup; | |
2929 | } | |
2930 | ||
2931 | rtnh = rtnh_next(rtnh, &remaining); | |
2932 | } | |
2933 | ||
2934 | err_nh = NULL; | |
2935 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
2936 | err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc); | |
2937 | /* nh->rt6_info is used or freed at this point, reset to NULL*/ | |
2938 | nh->rt6_info = NULL; | |
2939 | if (err) { | |
2940 | if (replace && nhn) | |
2941 | ip6_print_replace_route_err(&rt6_nh_list); | |
2942 | err_nh = nh; | |
2943 | goto add_errout; | |
51ebd318 | 2944 | } |
6b9ea5a6 | 2945 | |
1a72418b | 2946 | /* Because each route is added like a single route we remove |
27596472 MK |
2947 | * these flags after the first nexthop: if there is a collision, |
2948 | * we have already failed to add the first nexthop: | |
2949 | * fib6_add_rt2node() has rejected it; when replacing, old | |
2950 | * nexthops have been replaced by first new, the rest should | |
2951 | * be added to it. | |
1a72418b | 2952 | */ |
27596472 MK |
2953 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
2954 | NLM_F_REPLACE); | |
6b9ea5a6 RP |
2955 | nhn++; |
2956 | } | |
2957 | ||
2958 | goto cleanup; | |
2959 | ||
2960 | add_errout: | |
2961 | /* Delete routes that were already added */ | |
2962 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
2963 | if (err_nh == nh) | |
2964 | break; | |
2965 | ip6_route_del(&nh->r_cfg); | |
2966 | } | |
2967 | ||
2968 | cleanup: | |
2969 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
2970 | if (nh->rt6_info) | |
2971 | dst_free(&nh->rt6_info->dst); | |
52fe51f8 | 2972 | kfree(nh->mxc.mx); |
6b9ea5a6 RP |
2973 | list_del(&nh->next); |
2974 | kfree(nh); | |
2975 | } | |
2976 | ||
2977 | return err; | |
2978 | } | |
2979 | ||
2980 | static int ip6_route_multipath_del(struct fib6_config *cfg) | |
2981 | { | |
2982 | struct fib6_config r_cfg; | |
2983 | struct rtnexthop *rtnh; | |
2984 | int remaining; | |
2985 | int attrlen; | |
2986 | int err = 1, last_err = 0; | |
2987 | ||
2988 | remaining = cfg->fc_mp_len; | |
2989 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
2990 | ||
2991 | /* Parse a Multipath Entry */ | |
2992 | while (rtnh_ok(rtnh, remaining)) { | |
2993 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2994 | if (rtnh->rtnh_ifindex) | |
2995 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2996 | ||
2997 | attrlen = rtnh_attrlen(rtnh); | |
2998 | if (attrlen > 0) { | |
2999 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
3000 | ||
3001 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
3002 | if (nla) { | |
3003 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
3004 | r_cfg.fc_flags |= RTF_GATEWAY; | |
3005 | } | |
3006 | } | |
3007 | err = ip6_route_del(&r_cfg); | |
3008 | if (err) | |
3009 | last_err = err; | |
3010 | ||
51ebd318 ND |
3011 | rtnh = rtnh_next(rtnh, &remaining); |
3012 | } | |
3013 | ||
3014 | return last_err; | |
3015 | } | |
3016 | ||
67ba4152 | 3017 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 3018 | { |
86872cb5 TG |
3019 | struct fib6_config cfg; |
3020 | int err; | |
1da177e4 | 3021 | |
86872cb5 TG |
3022 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
3023 | if (err < 0) | |
3024 | return err; | |
3025 | ||
51ebd318 | 3026 | if (cfg.fc_mp) |
6b9ea5a6 | 3027 | return ip6_route_multipath_del(&cfg); |
51ebd318 ND |
3028 | else |
3029 | return ip6_route_del(&cfg); | |
1da177e4 LT |
3030 | } |
3031 | ||
67ba4152 | 3032 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 3033 | { |
86872cb5 TG |
3034 | struct fib6_config cfg; |
3035 | int err; | |
1da177e4 | 3036 | |
86872cb5 TG |
3037 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
3038 | if (err < 0) | |
3039 | return err; | |
3040 | ||
51ebd318 | 3041 | if (cfg.fc_mp) |
6b9ea5a6 | 3042 | return ip6_route_multipath_add(&cfg); |
51ebd318 ND |
3043 | else |
3044 | return ip6_route_add(&cfg); | |
1da177e4 LT |
3045 | } |
3046 | ||
19e42e45 | 3047 | static inline size_t rt6_nlmsg_size(struct rt6_info *rt) |
339bf98f TG |
3048 | { |
3049 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
3050 | + nla_total_size(16) /* RTA_SRC */ | |
3051 | + nla_total_size(16) /* RTA_DST */ | |
3052 | + nla_total_size(16) /* RTA_GATEWAY */ | |
3053 | + nla_total_size(16) /* RTA_PREFSRC */ | |
3054 | + nla_total_size(4) /* RTA_TABLE */ | |
3055 | + nla_total_size(4) /* RTA_IIF */ | |
3056 | + nla_total_size(4) /* RTA_OIF */ | |
3057 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 3058 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 3059 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 3060 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 3061 | + nla_total_size(1) /* RTA_PREF */ |
61adedf3 | 3062 | + lwtunnel_get_encap_size(rt->dst.lwtstate); |
339bf98f TG |
3063 | } |
3064 | ||
191cd582 BH |
3065 | static int rt6_fill_node(struct net *net, |
3066 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 3067 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 3068 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 3069 | int prefix, int nowait, unsigned int flags) |
1da177e4 | 3070 | { |
4b32b5ad | 3071 | u32 metrics[RTAX_MAX]; |
1da177e4 | 3072 | struct rtmsg *rtm; |
2d7202bf | 3073 | struct nlmsghdr *nlh; |
e3703b3d | 3074 | long expires; |
9e762a4a | 3075 | u32 table; |
1da177e4 LT |
3076 | |
3077 | if (prefix) { /* user wants prefix routes only */ | |
3078 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
3079 | /* success since this is not a prefix route */ | |
3080 | return 1; | |
3081 | } | |
3082 | } | |
3083 | ||
15e47304 | 3084 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 3085 | if (!nlh) |
26932566 | 3086 | return -EMSGSIZE; |
2d7202bf TG |
3087 | |
3088 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
3089 | rtm->rtm_family = AF_INET6; |
3090 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
3091 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
3092 | rtm->rtm_tos = 0; | |
c71099ac | 3093 | if (rt->rt6i_table) |
9e762a4a | 3094 | table = rt->rt6i_table->tb6_id; |
c71099ac | 3095 | else |
9e762a4a PM |
3096 | table = RT6_TABLE_UNSPEC; |
3097 | rtm->rtm_table = table; | |
c78679e8 DM |
3098 | if (nla_put_u32(skb, RTA_TABLE, table)) |
3099 | goto nla_put_failure; | |
ef2c7d7b ND |
3100 | if (rt->rt6i_flags & RTF_REJECT) { |
3101 | switch (rt->dst.error) { | |
3102 | case -EINVAL: | |
3103 | rtm->rtm_type = RTN_BLACKHOLE; | |
3104 | break; | |
3105 | case -EACCES: | |
3106 | rtm->rtm_type = RTN_PROHIBIT; | |
3107 | break; | |
b4949ab2 ND |
3108 | case -EAGAIN: |
3109 | rtm->rtm_type = RTN_THROW; | |
3110 | break; | |
ef2c7d7b ND |
3111 | default: |
3112 | rtm->rtm_type = RTN_UNREACHABLE; | |
3113 | break; | |
3114 | } | |
3115 | } | |
38308473 | 3116 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 3117 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 3118 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
3119 | rtm->rtm_type = RTN_LOCAL; |
3120 | else | |
3121 | rtm->rtm_type = RTN_UNICAST; | |
3122 | rtm->rtm_flags = 0; | |
35103d11 | 3123 | if (!netif_carrier_ok(rt->dst.dev)) { |
cea45e20 | 3124 | rtm->rtm_flags |= RTNH_F_LINKDOWN; |
35103d11 AG |
3125 | if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown) |
3126 | rtm->rtm_flags |= RTNH_F_DEAD; | |
3127 | } | |
1da177e4 LT |
3128 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
3129 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 3130 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 3131 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
3132 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
3133 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
3134 | rtm->rtm_protocol = RTPROT_RA; | |
3135 | else | |
3136 | rtm->rtm_protocol = RTPROT_KERNEL; | |
3137 | } | |
1da177e4 | 3138 | |
38308473 | 3139 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
3140 | rtm->rtm_flags |= RTM_F_CLONED; |
3141 | ||
3142 | if (dst) { | |
930345ea | 3143 | if (nla_put_in6_addr(skb, RTA_DST, dst)) |
c78679e8 | 3144 | goto nla_put_failure; |
1ab1457c | 3145 | rtm->rtm_dst_len = 128; |
1da177e4 | 3146 | } else if (rtm->rtm_dst_len) |
930345ea | 3147 | if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr)) |
c78679e8 | 3148 | goto nla_put_failure; |
1da177e4 LT |
3149 | #ifdef CONFIG_IPV6_SUBTREES |
3150 | if (src) { | |
930345ea | 3151 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 3152 | goto nla_put_failure; |
1ab1457c | 3153 | rtm->rtm_src_len = 128; |
c78679e8 | 3154 | } else if (rtm->rtm_src_len && |
930345ea | 3155 | nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr)) |
c78679e8 | 3156 | goto nla_put_failure; |
1da177e4 | 3157 | #endif |
7bc570c8 YH |
3158 | if (iif) { |
3159 | #ifdef CONFIG_IPV6_MROUTE | |
3160 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 3161 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
3162 | if (err <= 0) { |
3163 | if (!nowait) { | |
3164 | if (err == 0) | |
3165 | return 0; | |
3166 | goto nla_put_failure; | |
3167 | } else { | |
3168 | if (err == -EMSGSIZE) | |
3169 | goto nla_put_failure; | |
3170 | } | |
3171 | } | |
3172 | } else | |
3173 | #endif | |
c78679e8 DM |
3174 | if (nla_put_u32(skb, RTA_IIF, iif)) |
3175 | goto nla_put_failure; | |
7bc570c8 | 3176 | } else if (dst) { |
1da177e4 | 3177 | struct in6_addr saddr_buf; |
c78679e8 | 3178 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
930345ea | 3179 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3180 | goto nla_put_failure; |
1da177e4 | 3181 | } |
2d7202bf | 3182 | |
c3968a85 DW |
3183 | if (rt->rt6i_prefsrc.plen) { |
3184 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 3185 | saddr_buf = rt->rt6i_prefsrc.addr; |
930345ea | 3186 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3187 | goto nla_put_failure; |
c3968a85 DW |
3188 | } |
3189 | ||
4b32b5ad MKL |
3190 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
3191 | if (rt->rt6i_pmtu) | |
3192 | metrics[RTAX_MTU - 1] = rt->rt6i_pmtu; | |
3193 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
2d7202bf TG |
3194 | goto nla_put_failure; |
3195 | ||
dd0cbf29 | 3196 | if (rt->rt6i_flags & RTF_GATEWAY) { |
930345ea | 3197 | if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0) |
94f826b8 | 3198 | goto nla_put_failure; |
94f826b8 | 3199 | } |
2d7202bf | 3200 | |
c78679e8 DM |
3201 | if (rt->dst.dev && |
3202 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
3203 | goto nla_put_failure; | |
3204 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
3205 | goto nla_put_failure; | |
8253947e LW |
3206 | |
3207 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 3208 | |
87a50699 | 3209 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 3210 | goto nla_put_failure; |
2d7202bf | 3211 | |
c78ba6d6 LR |
3212 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags))) |
3213 | goto nla_put_failure; | |
3214 | ||
61adedf3 | 3215 | lwtunnel_fill_encap(skb, rt->dst.lwtstate); |
19e42e45 | 3216 | |
053c095a JB |
3217 | nlmsg_end(skb, nlh); |
3218 | return 0; | |
2d7202bf TG |
3219 | |
3220 | nla_put_failure: | |
26932566 PM |
3221 | nlmsg_cancel(skb, nlh); |
3222 | return -EMSGSIZE; | |
1da177e4 LT |
3223 | } |
3224 | ||
1b43af54 | 3225 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
3226 | { |
3227 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
3228 | int prefix; | |
3229 | ||
2d7202bf TG |
3230 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
3231 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
3232 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
3233 | } else | |
3234 | prefix = 0; | |
3235 | ||
191cd582 BH |
3236 | return rt6_fill_node(arg->net, |
3237 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 3238 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 3239 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
3240 | } |
3241 | ||
67ba4152 | 3242 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) |
1da177e4 | 3243 | { |
3b1e0a65 | 3244 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
3245 | struct nlattr *tb[RTA_MAX+1]; |
3246 | struct rt6_info *rt; | |
1da177e4 | 3247 | struct sk_buff *skb; |
ab364a6f | 3248 | struct rtmsg *rtm; |
4c9483b2 | 3249 | struct flowi6 fl6; |
72331bc0 | 3250 | int err, iif = 0, oif = 0; |
1da177e4 | 3251 | |
ab364a6f TG |
3252 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
3253 | if (err < 0) | |
3254 | goto errout; | |
1da177e4 | 3255 | |
ab364a6f | 3256 | err = -EINVAL; |
4c9483b2 | 3257 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 3258 | |
ab364a6f TG |
3259 | if (tb[RTA_SRC]) { |
3260 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
3261 | goto errout; | |
3262 | ||
4e3fd7a0 | 3263 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
3264 | } |
3265 | ||
3266 | if (tb[RTA_DST]) { | |
3267 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
3268 | goto errout; | |
3269 | ||
4e3fd7a0 | 3270 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
3271 | } |
3272 | ||
3273 | if (tb[RTA_IIF]) | |
3274 | iif = nla_get_u32(tb[RTA_IIF]); | |
3275 | ||
3276 | if (tb[RTA_OIF]) | |
72331bc0 | 3277 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 3278 | |
2e47b291 LC |
3279 | if (tb[RTA_MARK]) |
3280 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
3281 | ||
1da177e4 LT |
3282 | if (iif) { |
3283 | struct net_device *dev; | |
72331bc0 SL |
3284 | int flags = 0; |
3285 | ||
5578689a | 3286 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
3287 | if (!dev) { |
3288 | err = -ENODEV; | |
ab364a6f | 3289 | goto errout; |
1da177e4 | 3290 | } |
72331bc0 SL |
3291 | |
3292 | fl6.flowi6_iif = iif; | |
3293 | ||
3294 | if (!ipv6_addr_any(&fl6.saddr)) | |
3295 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3296 | ||
3297 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
3298 | flags); | |
3299 | } else { | |
3300 | fl6.flowi6_oif = oif; | |
3301 | ||
ca254490 DA |
3302 | if (netif_index_is_l3_master(net, oif)) { |
3303 | fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | | |
3304 | FLOWI_FLAG_SKIP_NH_OIF; | |
3305 | } | |
3306 | ||
72331bc0 | 3307 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); |
1da177e4 LT |
3308 | } |
3309 | ||
ab364a6f | 3310 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 3311 | if (!skb) { |
94e187c0 | 3312 | ip6_rt_put(rt); |
ab364a6f TG |
3313 | err = -ENOBUFS; |
3314 | goto errout; | |
3315 | } | |
1da177e4 | 3316 | |
ab364a6f TG |
3317 | /* Reserve room for dummy headers, this skb can pass |
3318 | through good chunk of routing engine. | |
3319 | */ | |
459a98ed | 3320 | skb_reset_mac_header(skb); |
ab364a6f | 3321 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 3322 | |
d8d1f30b | 3323 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 3324 | |
4c9483b2 | 3325 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 3326 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 3327 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 3328 | if (err < 0) { |
ab364a6f TG |
3329 | kfree_skb(skb); |
3330 | goto errout; | |
1da177e4 LT |
3331 | } |
3332 | ||
15e47304 | 3333 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 3334 | errout: |
1da177e4 | 3335 | return err; |
1da177e4 LT |
3336 | } |
3337 | ||
37a1d361 RP |
3338 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info, |
3339 | unsigned int nlm_flags) | |
1da177e4 LT |
3340 | { |
3341 | struct sk_buff *skb; | |
5578689a | 3342 | struct net *net = info->nl_net; |
528c4ceb DL |
3343 | u32 seq; |
3344 | int err; | |
3345 | ||
3346 | err = -ENOBUFS; | |
38308473 | 3347 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 3348 | |
19e42e45 | 3349 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 3350 | if (!skb) |
21713ebc TG |
3351 | goto errout; |
3352 | ||
191cd582 | 3353 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
37a1d361 | 3354 | event, info->portid, seq, 0, 0, nlm_flags); |
26932566 PM |
3355 | if (err < 0) { |
3356 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
3357 | WARN_ON(err == -EMSGSIZE); | |
3358 | kfree_skb(skb); | |
3359 | goto errout; | |
3360 | } | |
15e47304 | 3361 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
3362 | info->nlh, gfp_any()); |
3363 | return; | |
21713ebc TG |
3364 | errout: |
3365 | if (err < 0) | |
5578689a | 3366 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
3367 | } |
3368 | ||
8ed67789 | 3369 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 3370 | unsigned long event, void *ptr) |
8ed67789 | 3371 | { |
351638e7 | 3372 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3373 | struct net *net = dev_net(dev); |
8ed67789 DL |
3374 | |
3375 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 3376 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
3377 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
3378 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3379 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 3380 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 3381 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
3382 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
3383 | #endif | |
3384 | } | |
3385 | ||
3386 | return NOTIFY_OK; | |
3387 | } | |
3388 | ||
1da177e4 LT |
3389 | /* |
3390 | * /proc | |
3391 | */ | |
3392 | ||
3393 | #ifdef CONFIG_PROC_FS | |
3394 | ||
33120b30 AD |
3395 | static const struct file_operations ipv6_route_proc_fops = { |
3396 | .owner = THIS_MODULE, | |
3397 | .open = ipv6_route_open, | |
3398 | .read = seq_read, | |
3399 | .llseek = seq_lseek, | |
8d2ca1d7 | 3400 | .release = seq_release_net, |
33120b30 AD |
3401 | }; |
3402 | ||
1da177e4 LT |
3403 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
3404 | { | |
69ddb805 | 3405 | struct net *net = (struct net *)seq->private; |
1da177e4 | 3406 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
3407 | net->ipv6.rt6_stats->fib_nodes, |
3408 | net->ipv6.rt6_stats->fib_route_nodes, | |
3409 | net->ipv6.rt6_stats->fib_rt_alloc, | |
3410 | net->ipv6.rt6_stats->fib_rt_entries, | |
3411 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 3412 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 3413 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
3414 | |
3415 | return 0; | |
3416 | } | |
3417 | ||
3418 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
3419 | { | |
de05c557 | 3420 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
3421 | } |
3422 | ||
9a32144e | 3423 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
3424 | .owner = THIS_MODULE, |
3425 | .open = rt6_stats_seq_open, | |
3426 | .read = seq_read, | |
3427 | .llseek = seq_lseek, | |
b6fcbdb4 | 3428 | .release = single_release_net, |
1da177e4 LT |
3429 | }; |
3430 | #endif /* CONFIG_PROC_FS */ | |
3431 | ||
3432 | #ifdef CONFIG_SYSCTL | |
3433 | ||
1da177e4 | 3434 | static |
fe2c6338 | 3435 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
3436 | void __user *buffer, size_t *lenp, loff_t *ppos) |
3437 | { | |
c486da34 LAG |
3438 | struct net *net; |
3439 | int delay; | |
3440 | if (!write) | |
1da177e4 | 3441 | return -EINVAL; |
c486da34 LAG |
3442 | |
3443 | net = (struct net *)ctl->extra1; | |
3444 | delay = net->ipv6.sysctl.flush_delay; | |
3445 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 3446 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 3447 | return 0; |
1da177e4 LT |
3448 | } |
3449 | ||
fe2c6338 | 3450 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 3451 | { |
1da177e4 | 3452 | .procname = "flush", |
4990509f | 3453 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 3454 | .maxlen = sizeof(int), |
89c8b3a1 | 3455 | .mode = 0200, |
6d9f239a | 3456 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
3457 | }, |
3458 | { | |
1da177e4 | 3459 | .procname = "gc_thresh", |
9a7ec3a9 | 3460 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
3461 | .maxlen = sizeof(int), |
3462 | .mode = 0644, | |
6d9f239a | 3463 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3464 | }, |
3465 | { | |
1da177e4 | 3466 | .procname = "max_size", |
4990509f | 3467 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
3468 | .maxlen = sizeof(int), |
3469 | .mode = 0644, | |
6d9f239a | 3470 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3471 | }, |
3472 | { | |
1da177e4 | 3473 | .procname = "gc_min_interval", |
4990509f | 3474 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3475 | .maxlen = sizeof(int), |
3476 | .mode = 0644, | |
6d9f239a | 3477 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3478 | }, |
3479 | { | |
1da177e4 | 3480 | .procname = "gc_timeout", |
4990509f | 3481 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
3482 | .maxlen = sizeof(int), |
3483 | .mode = 0644, | |
6d9f239a | 3484 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3485 | }, |
3486 | { | |
1da177e4 | 3487 | .procname = "gc_interval", |
4990509f | 3488 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
3489 | .maxlen = sizeof(int), |
3490 | .mode = 0644, | |
6d9f239a | 3491 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3492 | }, |
3493 | { | |
1da177e4 | 3494 | .procname = "gc_elasticity", |
4990509f | 3495 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
3496 | .maxlen = sizeof(int), |
3497 | .mode = 0644, | |
f3d3f616 | 3498 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3499 | }, |
3500 | { | |
1da177e4 | 3501 | .procname = "mtu_expires", |
4990509f | 3502 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
3503 | .maxlen = sizeof(int), |
3504 | .mode = 0644, | |
6d9f239a | 3505 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3506 | }, |
3507 | { | |
1da177e4 | 3508 | .procname = "min_adv_mss", |
4990509f | 3509 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
3510 | .maxlen = sizeof(int), |
3511 | .mode = 0644, | |
f3d3f616 | 3512 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3513 | }, |
3514 | { | |
1da177e4 | 3515 | .procname = "gc_min_interval_ms", |
4990509f | 3516 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3517 | .maxlen = sizeof(int), |
3518 | .mode = 0644, | |
6d9f239a | 3519 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 3520 | }, |
f8572d8f | 3521 | { } |
1da177e4 LT |
3522 | }; |
3523 | ||
2c8c1e72 | 3524 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
3525 | { |
3526 | struct ctl_table *table; | |
3527 | ||
3528 | table = kmemdup(ipv6_route_table_template, | |
3529 | sizeof(ipv6_route_table_template), | |
3530 | GFP_KERNEL); | |
5ee09105 YH |
3531 | |
3532 | if (table) { | |
3533 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 3534 | table[0].extra1 = net; |
86393e52 | 3535 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
3536 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
3537 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
3538 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3539 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
3540 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3541 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
3542 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 3543 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
3544 | |
3545 | /* Don't export sysctls to unprivileged users */ | |
3546 | if (net->user_ns != &init_user_ns) | |
3547 | table[0].procname = NULL; | |
5ee09105 YH |
3548 | } |
3549 | ||
760f2d01 DL |
3550 | return table; |
3551 | } | |
1da177e4 LT |
3552 | #endif |
3553 | ||
2c8c1e72 | 3554 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 3555 | { |
633d424b | 3556 | int ret = -ENOMEM; |
8ed67789 | 3557 | |
86393e52 AD |
3558 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
3559 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 3560 | |
fc66f95c ED |
3561 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
3562 | goto out_ip6_dst_ops; | |
3563 | ||
8ed67789 DL |
3564 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
3565 | sizeof(*net->ipv6.ip6_null_entry), | |
3566 | GFP_KERNEL); | |
3567 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 3568 | goto out_ip6_dst_entries; |
d8d1f30b | 3569 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 3570 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 3571 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3572 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
3573 | ip6_template_metrics, true); | |
8ed67789 DL |
3574 | |
3575 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3576 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
3577 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
3578 | GFP_KERNEL); | |
68fffc67 PZ |
3579 | if (!net->ipv6.ip6_prohibit_entry) |
3580 | goto out_ip6_null_entry; | |
d8d1f30b | 3581 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 3582 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 3583 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3584 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
3585 | ip6_template_metrics, true); | |
8ed67789 DL |
3586 | |
3587 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
3588 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
3589 | GFP_KERNEL); | |
68fffc67 PZ |
3590 | if (!net->ipv6.ip6_blk_hole_entry) |
3591 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 3592 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 3593 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 3594 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3595 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
3596 | ip6_template_metrics, true); | |
8ed67789 DL |
3597 | #endif |
3598 | ||
b339a47c PZ |
3599 | net->ipv6.sysctl.flush_delay = 0; |
3600 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3601 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3602 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3603 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3604 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
3605 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
3606 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
3607 | ||
6891a346 BT |
3608 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
3609 | ||
8ed67789 DL |
3610 | ret = 0; |
3611 | out: | |
3612 | return ret; | |
f2fc6a54 | 3613 | |
68fffc67 PZ |
3614 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
3615 | out_ip6_prohibit_entry: | |
3616 | kfree(net->ipv6.ip6_prohibit_entry); | |
3617 | out_ip6_null_entry: | |
3618 | kfree(net->ipv6.ip6_null_entry); | |
3619 | #endif | |
fc66f95c ED |
3620 | out_ip6_dst_entries: |
3621 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3622 | out_ip6_dst_ops: |
f2fc6a54 | 3623 | goto out; |
cdb18761 DL |
3624 | } |
3625 | ||
2c8c1e72 | 3626 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3627 | { |
8ed67789 DL |
3628 | kfree(net->ipv6.ip6_null_entry); |
3629 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3630 | kfree(net->ipv6.ip6_prohibit_entry); | |
3631 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3632 | #endif | |
41bb78b4 | 3633 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3634 | } |
3635 | ||
d189634e TG |
3636 | static int __net_init ip6_route_net_init_late(struct net *net) |
3637 | { | |
3638 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
3639 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
3640 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3641 | #endif |
3642 | return 0; | |
3643 | } | |
3644 | ||
3645 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3646 | { | |
3647 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3648 | remove_proc_entry("ipv6_route", net->proc_net); |
3649 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3650 | #endif |
3651 | } | |
3652 | ||
cdb18761 DL |
3653 | static struct pernet_operations ip6_route_net_ops = { |
3654 | .init = ip6_route_net_init, | |
3655 | .exit = ip6_route_net_exit, | |
3656 | }; | |
3657 | ||
c3426b47 DM |
3658 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3659 | { | |
3660 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3661 | ||
3662 | if (!bp) | |
3663 | return -ENOMEM; | |
3664 | inet_peer_base_init(bp); | |
3665 | net->ipv6.peers = bp; | |
3666 | return 0; | |
3667 | } | |
3668 | ||
3669 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3670 | { | |
3671 | struct inet_peer_base *bp = net->ipv6.peers; | |
3672 | ||
3673 | net->ipv6.peers = NULL; | |
56a6b248 | 3674 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3675 | kfree(bp); |
3676 | } | |
3677 | ||
2b823f72 | 3678 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3679 | .init = ipv6_inetpeer_init, |
3680 | .exit = ipv6_inetpeer_exit, | |
3681 | }; | |
3682 | ||
d189634e TG |
3683 | static struct pernet_operations ip6_route_net_late_ops = { |
3684 | .init = ip6_route_net_init_late, | |
3685 | .exit = ip6_route_net_exit_late, | |
3686 | }; | |
3687 | ||
8ed67789 DL |
3688 | static struct notifier_block ip6_route_dev_notifier = { |
3689 | .notifier_call = ip6_route_dev_notify, | |
3690 | .priority = 0, | |
3691 | }; | |
3692 | ||
433d49c3 | 3693 | int __init ip6_route_init(void) |
1da177e4 | 3694 | { |
433d49c3 | 3695 | int ret; |
8d0b94af | 3696 | int cpu; |
433d49c3 | 3697 | |
9a7ec3a9 DL |
3698 | ret = -ENOMEM; |
3699 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3700 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3701 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3702 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3703 | goto out; |
14e50e57 | 3704 | |
fc66f95c | 3705 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3706 | if (ret) |
bdb3289f | 3707 | goto out_kmem_cache; |
bdb3289f | 3708 | |
c3426b47 DM |
3709 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3710 | if (ret) | |
e8803b6c | 3711 | goto out_dst_entries; |
2a0c451a | 3712 | |
7e52b33b DM |
3713 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3714 | if (ret) | |
3715 | goto out_register_inetpeer; | |
c3426b47 | 3716 | |
5dc121e9 AE |
3717 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3718 | ||
8ed67789 DL |
3719 | /* Registering of the loopback is done before this portion of code, |
3720 | * the loopback reference in rt6_info will not be taken, do it | |
3721 | * manually for init_net */ | |
d8d1f30b | 3722 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3723 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3724 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3725 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3726 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3727 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3728 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3729 | #endif | |
e8803b6c | 3730 | ret = fib6_init(); |
433d49c3 | 3731 | if (ret) |
8ed67789 | 3732 | goto out_register_subsys; |
433d49c3 | 3733 | |
433d49c3 DL |
3734 | ret = xfrm6_init(); |
3735 | if (ret) | |
e8803b6c | 3736 | goto out_fib6_init; |
c35b7e72 | 3737 | |
433d49c3 DL |
3738 | ret = fib6_rules_init(); |
3739 | if (ret) | |
3740 | goto xfrm6_init; | |
7e5449c2 | 3741 | |
d189634e TG |
3742 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3743 | if (ret) | |
3744 | goto fib6_rules_init; | |
3745 | ||
433d49c3 | 3746 | ret = -ENOBUFS; |
c7ac8679 GR |
3747 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3748 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3749 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3750 | goto out_register_late_subsys; |
c127ea2c | 3751 | |
8ed67789 | 3752 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3753 | if (ret) |
d189634e | 3754 | goto out_register_late_subsys; |
8ed67789 | 3755 | |
8d0b94af MKL |
3756 | for_each_possible_cpu(cpu) { |
3757 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
3758 | ||
3759 | INIT_LIST_HEAD(&ul->head); | |
3760 | spin_lock_init(&ul->lock); | |
3761 | } | |
3762 | ||
433d49c3 DL |
3763 | out: |
3764 | return ret; | |
3765 | ||
d189634e TG |
3766 | out_register_late_subsys: |
3767 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3768 | fib6_rules_init: |
433d49c3 DL |
3769 | fib6_rules_cleanup(); |
3770 | xfrm6_init: | |
433d49c3 | 3771 | xfrm6_fini(); |
2a0c451a TG |
3772 | out_fib6_init: |
3773 | fib6_gc_cleanup(); | |
8ed67789 DL |
3774 | out_register_subsys: |
3775 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3776 | out_register_inetpeer: |
3777 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3778 | out_dst_entries: |
3779 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3780 | out_kmem_cache: |
f2fc6a54 | 3781 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3782 | goto out; |
1da177e4 LT |
3783 | } |
3784 | ||
3785 | void ip6_route_cleanup(void) | |
3786 | { | |
8ed67789 | 3787 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3788 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3789 | fib6_rules_cleanup(); |
1da177e4 | 3790 | xfrm6_fini(); |
1da177e4 | 3791 | fib6_gc_cleanup(); |
c3426b47 | 3792 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3793 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3794 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3795 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3796 | } |