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> |
1da177e4 LT |
65 | |
66 | #include <asm/uaccess.h> | |
67 | ||
68 | #ifdef CONFIG_SYSCTL | |
69 | #include <linux/sysctl.h> | |
70 | #endif | |
71 | ||
afc154e9 | 72 | enum rt6_nud_state { |
7e980569 JB |
73 | RT6_NUD_FAIL_HARD = -3, |
74 | RT6_NUD_FAIL_PROBE = -2, | |
75 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
76 | RT6_NUD_SUCCEED = 1 |
77 | }; | |
78 | ||
83a09abd | 79 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort); |
1da177e4 | 80 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 81 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 82 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
83 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
84 | static void ip6_dst_destroy(struct dst_entry *); | |
85 | static void ip6_dst_ifdown(struct dst_entry *, | |
86 | struct net_device *dev, int how); | |
569d3645 | 87 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
88 | |
89 | static int ip6_pkt_discard(struct sk_buff *skb); | |
ede2059d | 90 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
7150aede | 91 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
ede2059d | 92 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 93 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
94 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
95 | struct sk_buff *skb, u32 mtu); | |
96 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
97 | struct sk_buff *skb); | |
4b32b5ad | 98 | static void rt6_dst_from_metrics_check(struct rt6_info *rt); |
52bd4c0c | 99 | static int rt6_score_route(struct rt6_info *rt, int oif, int strict); |
1da177e4 | 100 | |
70ceb4f5 | 101 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 102 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
103 | const struct in6_addr *prefix, int prefixlen, |
104 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 105 | unsigned int pref); |
efa2cea0 | 106 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
107 | const struct in6_addr *prefix, int prefixlen, |
108 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
109 | #endif |
110 | ||
8d0b94af MKL |
111 | struct uncached_list { |
112 | spinlock_t lock; | |
113 | struct list_head head; | |
114 | }; | |
115 | ||
116 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
117 | ||
118 | static void rt6_uncached_list_add(struct rt6_info *rt) | |
119 | { | |
120 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
121 | ||
122 | rt->dst.flags |= DST_NOCACHE; | |
123 | rt->rt6i_uncached_list = ul; | |
124 | ||
125 | spin_lock_bh(&ul->lock); | |
126 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
127 | spin_unlock_bh(&ul->lock); | |
128 | } | |
129 | ||
130 | static void rt6_uncached_list_del(struct rt6_info *rt) | |
131 | { | |
132 | if (!list_empty(&rt->rt6i_uncached)) { | |
133 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
134 | ||
135 | spin_lock_bh(&ul->lock); | |
136 | list_del(&rt->rt6i_uncached); | |
137 | spin_unlock_bh(&ul->lock); | |
138 | } | |
139 | } | |
140 | ||
141 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
142 | { | |
143 | struct net_device *loopback_dev = net->loopback_dev; | |
144 | int cpu; | |
145 | ||
e332bc67 EB |
146 | if (dev == loopback_dev) |
147 | return; | |
148 | ||
8d0b94af MKL |
149 | for_each_possible_cpu(cpu) { |
150 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
151 | struct rt6_info *rt; | |
152 | ||
153 | spin_lock_bh(&ul->lock); | |
154 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
155 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
156 | struct net_device *rt_dev = rt->dst.dev; | |
157 | ||
e332bc67 | 158 | if (rt_idev->dev == dev) { |
8d0b94af MKL |
159 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
160 | in6_dev_put(rt_idev); | |
161 | } | |
162 | ||
e332bc67 | 163 | if (rt_dev == dev) { |
8d0b94af MKL |
164 | rt->dst.dev = loopback_dev; |
165 | dev_hold(rt->dst.dev); | |
166 | dev_put(rt_dev); | |
167 | } | |
168 | } | |
169 | spin_unlock_bh(&ul->lock); | |
170 | } | |
171 | } | |
172 | ||
d52d3997 MKL |
173 | static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt) |
174 | { | |
175 | return dst_metrics_write_ptr(rt->dst.from); | |
176 | } | |
177 | ||
06582540 DM |
178 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
179 | { | |
4b32b5ad | 180 | struct rt6_info *rt = (struct rt6_info *)dst; |
06582540 | 181 | |
d52d3997 MKL |
182 | if (rt->rt6i_flags & RTF_PCPU) |
183 | return rt6_pcpu_cow_metrics(rt); | |
184 | else if (rt->rt6i_flags & RTF_CACHE) | |
4b32b5ad MKL |
185 | return NULL; |
186 | else | |
3b471175 | 187 | return dst_cow_metrics_generic(dst, old); |
06582540 DM |
188 | } |
189 | ||
f894cbf8 DM |
190 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
191 | struct sk_buff *skb, | |
192 | const void *daddr) | |
39232973 DM |
193 | { |
194 | struct in6_addr *p = &rt->rt6i_gateway; | |
195 | ||
a7563f34 | 196 | if (!ipv6_addr_any(p)) |
39232973 | 197 | return (const void *) p; |
f894cbf8 DM |
198 | else if (skb) |
199 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
200 | return daddr; |
201 | } | |
202 | ||
f894cbf8 DM |
203 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
204 | struct sk_buff *skb, | |
205 | const void *daddr) | |
d3aaeb38 | 206 | { |
39232973 DM |
207 | struct rt6_info *rt = (struct rt6_info *) dst; |
208 | struct neighbour *n; | |
209 | ||
f894cbf8 | 210 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 211 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
212 | if (n) |
213 | return n; | |
214 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
215 | } | |
216 | ||
9a7ec3a9 | 217 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 218 | .family = AF_INET6, |
1da177e4 LT |
219 | .gc = ip6_dst_gc, |
220 | .gc_thresh = 1024, | |
221 | .check = ip6_dst_check, | |
0dbaee3b | 222 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 223 | .mtu = ip6_mtu, |
06582540 | 224 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
225 | .destroy = ip6_dst_destroy, |
226 | .ifdown = ip6_dst_ifdown, | |
227 | .negative_advice = ip6_negative_advice, | |
228 | .link_failure = ip6_link_failure, | |
229 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 230 | .redirect = rt6_do_redirect, |
9f8955cc | 231 | .local_out = __ip6_local_out, |
d3aaeb38 | 232 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
233 | }; |
234 | ||
ebb762f2 | 235 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 236 | { |
618f9bc7 SK |
237 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
238 | ||
239 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
240 | } |
241 | ||
6700c270 DM |
242 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
243 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
244 | { |
245 | } | |
246 | ||
6700c270 DM |
247 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
248 | struct sk_buff *skb) | |
b587ee3b DM |
249 | { |
250 | } | |
251 | ||
14e50e57 DM |
252 | static struct dst_ops ip6_dst_blackhole_ops = { |
253 | .family = AF_INET6, | |
14e50e57 DM |
254 | .destroy = ip6_dst_destroy, |
255 | .check = ip6_dst_check, | |
ebb762f2 | 256 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 257 | .default_advmss = ip6_default_advmss, |
14e50e57 | 258 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 259 | .redirect = ip6_rt_blackhole_redirect, |
0a1f5962 | 260 | .cow_metrics = dst_cow_metrics_generic, |
d3aaeb38 | 261 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
262 | }; |
263 | ||
62fa8a84 | 264 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 265 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
266 | }; |
267 | ||
fb0af4c7 | 268 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
269 | .dst = { |
270 | .__refcnt = ATOMIC_INIT(1), | |
271 | .__use = 1, | |
2c20cbd7 | 272 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 273 | .error = -ENETUNREACH, |
d8d1f30b CG |
274 | .input = ip6_pkt_discard, |
275 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
276 | }, |
277 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 278 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
279 | .rt6i_metric = ~(u32) 0, |
280 | .rt6i_ref = ATOMIC_INIT(1), | |
281 | }; | |
282 | ||
101367c2 TG |
283 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
284 | ||
fb0af4c7 | 285 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
286 | .dst = { |
287 | .__refcnt = ATOMIC_INIT(1), | |
288 | .__use = 1, | |
2c20cbd7 | 289 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 290 | .error = -EACCES, |
d8d1f30b CG |
291 | .input = ip6_pkt_prohibit, |
292 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
293 | }, |
294 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 295 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
296 | .rt6i_metric = ~(u32) 0, |
297 | .rt6i_ref = ATOMIC_INIT(1), | |
298 | }; | |
299 | ||
fb0af4c7 | 300 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
301 | .dst = { |
302 | .__refcnt = ATOMIC_INIT(1), | |
303 | .__use = 1, | |
2c20cbd7 | 304 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 305 | .error = -EINVAL, |
d8d1f30b | 306 | .input = dst_discard, |
ede2059d | 307 | .output = dst_discard_out, |
101367c2 TG |
308 | }, |
309 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 310 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
311 | .rt6i_metric = ~(u32) 0, |
312 | .rt6i_ref = ATOMIC_INIT(1), | |
313 | }; | |
314 | ||
315 | #endif | |
316 | ||
ebfa45f0 MKL |
317 | static void rt6_info_init(struct rt6_info *rt) |
318 | { | |
319 | struct dst_entry *dst = &rt->dst; | |
320 | ||
321 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
322 | INIT_LIST_HEAD(&rt->rt6i_siblings); | |
323 | INIT_LIST_HEAD(&rt->rt6i_uncached); | |
324 | } | |
325 | ||
1da177e4 | 326 | /* allocate dst with ip6_dst_ops */ |
d52d3997 MKL |
327 | static struct rt6_info *__ip6_dst_alloc(struct net *net, |
328 | struct net_device *dev, | |
ad706862 | 329 | int flags) |
1da177e4 | 330 | { |
97bab73f | 331 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 332 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 333 | |
ebfa45f0 MKL |
334 | if (rt) |
335 | rt6_info_init(rt); | |
8104891b | 336 | |
cf911662 | 337 | return rt; |
1da177e4 LT |
338 | } |
339 | ||
d52d3997 MKL |
340 | static struct rt6_info *ip6_dst_alloc(struct net *net, |
341 | struct net_device *dev, | |
ad706862 | 342 | int flags) |
d52d3997 | 343 | { |
ad706862 | 344 | struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags); |
d52d3997 MKL |
345 | |
346 | if (rt) { | |
347 | rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC); | |
348 | if (rt->rt6i_pcpu) { | |
349 | int cpu; | |
350 | ||
351 | for_each_possible_cpu(cpu) { | |
352 | struct rt6_info **p; | |
353 | ||
354 | p = per_cpu_ptr(rt->rt6i_pcpu, cpu); | |
355 | /* no one shares rt */ | |
356 | *p = NULL; | |
357 | } | |
358 | } else { | |
359 | dst_destroy((struct dst_entry *)rt); | |
360 | return NULL; | |
361 | } | |
362 | } | |
363 | ||
364 | return rt; | |
365 | } | |
366 | ||
1da177e4 LT |
367 | static void ip6_dst_destroy(struct dst_entry *dst) |
368 | { | |
369 | struct rt6_info *rt = (struct rt6_info *)dst; | |
ecd98837 | 370 | struct dst_entry *from = dst->from; |
8d0b94af | 371 | struct inet6_dev *idev; |
1da177e4 | 372 | |
4b32b5ad | 373 | dst_destroy_metrics_generic(dst); |
87775312 | 374 | free_percpu(rt->rt6i_pcpu); |
8d0b94af MKL |
375 | rt6_uncached_list_del(rt); |
376 | ||
377 | idev = rt->rt6i_idev; | |
38308473 | 378 | if (idev) { |
1da177e4 LT |
379 | rt->rt6i_idev = NULL; |
380 | in6_dev_put(idev); | |
1ab1457c | 381 | } |
1716a961 | 382 | |
ecd98837 YH |
383 | dst->from = NULL; |
384 | dst_release(from); | |
b3419363 DM |
385 | } |
386 | ||
1da177e4 LT |
387 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
388 | int how) | |
389 | { | |
390 | struct rt6_info *rt = (struct rt6_info *)dst; | |
391 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 392 | struct net_device *loopback_dev = |
c346dca1 | 393 | dev_net(dev)->loopback_dev; |
1da177e4 | 394 | |
97cac082 DM |
395 | if (dev != loopback_dev) { |
396 | if (idev && idev->dev == dev) { | |
397 | struct inet6_dev *loopback_idev = | |
398 | in6_dev_get(loopback_dev); | |
399 | if (loopback_idev) { | |
400 | rt->rt6i_idev = loopback_idev; | |
401 | in6_dev_put(idev); | |
402 | } | |
403 | } | |
1da177e4 LT |
404 | } |
405 | } | |
406 | ||
5973fb1e MKL |
407 | static bool __rt6_check_expired(const struct rt6_info *rt) |
408 | { | |
409 | if (rt->rt6i_flags & RTF_EXPIRES) | |
410 | return time_after(jiffies, rt->dst.expires); | |
411 | else | |
412 | return false; | |
413 | } | |
414 | ||
a50feda5 | 415 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 416 | { |
1716a961 G |
417 | if (rt->rt6i_flags & RTF_EXPIRES) { |
418 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 419 | return true; |
1716a961 | 420 | } else if (rt->dst.from) { |
3fd91fb3 | 421 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 422 | } |
a50feda5 | 423 | return false; |
1da177e4 LT |
424 | } |
425 | ||
51ebd318 ND |
426 | /* Multipath route selection: |
427 | * Hash based function using packet header and flowlabel. | |
428 | * Adapted from fib_info_hashfn() | |
429 | */ | |
430 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
431 | const struct flowi6 *fl6) | |
432 | { | |
644d0e65 | 433 | return get_hash_from_flowi6(fl6) % candidate_count; |
51ebd318 ND |
434 | } |
435 | ||
436 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
52bd4c0c ND |
437 | struct flowi6 *fl6, int oif, |
438 | int strict) | |
51ebd318 ND |
439 | { |
440 | struct rt6_info *sibling, *next_sibling; | |
441 | int route_choosen; | |
442 | ||
443 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
444 | /* Don't change the route, if route_choosen == 0 | |
445 | * (siblings does not include ourself) | |
446 | */ | |
447 | if (route_choosen) | |
448 | list_for_each_entry_safe(sibling, next_sibling, | |
449 | &match->rt6i_siblings, rt6i_siblings) { | |
450 | route_choosen--; | |
451 | if (route_choosen == 0) { | |
52bd4c0c ND |
452 | if (rt6_score_route(sibling, oif, strict) < 0) |
453 | break; | |
51ebd318 ND |
454 | match = sibling; |
455 | break; | |
456 | } | |
457 | } | |
458 | return match; | |
459 | } | |
460 | ||
1da177e4 | 461 | /* |
c71099ac | 462 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
463 | */ |
464 | ||
8ed67789 DL |
465 | static inline struct rt6_info *rt6_device_match(struct net *net, |
466 | struct rt6_info *rt, | |
b71d1d42 | 467 | const struct in6_addr *saddr, |
1da177e4 | 468 | int oif, |
d420895e | 469 | int flags) |
1da177e4 LT |
470 | { |
471 | struct rt6_info *local = NULL; | |
472 | struct rt6_info *sprt; | |
473 | ||
dd3abc4e YH |
474 | if (!oif && ipv6_addr_any(saddr)) |
475 | goto out; | |
476 | ||
d8d1f30b | 477 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 478 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
479 | |
480 | if (oif) { | |
1da177e4 LT |
481 | if (dev->ifindex == oif) |
482 | return sprt; | |
483 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 484 | if (!sprt->rt6i_idev || |
1da177e4 | 485 | sprt->rt6i_idev->dev->ifindex != oif) { |
17fb0b2b | 486 | if (flags & RT6_LOOKUP_F_IFACE) |
1da177e4 | 487 | continue; |
17fb0b2b DA |
488 | if (local && |
489 | local->rt6i_idev->dev->ifindex == oif) | |
1da177e4 LT |
490 | continue; |
491 | } | |
492 | local = sprt; | |
493 | } | |
dd3abc4e YH |
494 | } else { |
495 | if (ipv6_chk_addr(net, saddr, dev, | |
496 | flags & RT6_LOOKUP_F_IFACE)) | |
497 | return sprt; | |
1da177e4 | 498 | } |
dd3abc4e | 499 | } |
1da177e4 | 500 | |
dd3abc4e | 501 | if (oif) { |
1da177e4 LT |
502 | if (local) |
503 | return local; | |
504 | ||
d420895e | 505 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 506 | return net->ipv6.ip6_null_entry; |
1da177e4 | 507 | } |
dd3abc4e | 508 | out: |
1da177e4 LT |
509 | return rt; |
510 | } | |
511 | ||
27097255 | 512 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
513 | struct __rt6_probe_work { |
514 | struct work_struct work; | |
515 | struct in6_addr target; | |
516 | struct net_device *dev; | |
517 | }; | |
518 | ||
519 | static void rt6_probe_deferred(struct work_struct *w) | |
520 | { | |
521 | struct in6_addr mcaddr; | |
522 | struct __rt6_probe_work *work = | |
523 | container_of(w, struct __rt6_probe_work, work); | |
524 | ||
525 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
38cf595b | 526 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, NULL); |
c2f17e82 | 527 | dev_put(work->dev); |
662f5533 | 528 | kfree(work); |
c2f17e82 HFS |
529 | } |
530 | ||
27097255 YH |
531 | static void rt6_probe(struct rt6_info *rt) |
532 | { | |
990edb42 | 533 | struct __rt6_probe_work *work; |
f2c31e32 | 534 | struct neighbour *neigh; |
27097255 YH |
535 | /* |
536 | * Okay, this does not seem to be appropriate | |
537 | * for now, however, we need to check if it | |
538 | * is really so; aka Router Reachability Probing. | |
539 | * | |
540 | * Router Reachability Probe MUST be rate-limited | |
541 | * to no more than one per minute. | |
542 | */ | |
2152caea | 543 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 544 | return; |
2152caea YH |
545 | rcu_read_lock_bh(); |
546 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
547 | if (neigh) { | |
8d6c31bf MKL |
548 | if (neigh->nud_state & NUD_VALID) |
549 | goto out; | |
550 | ||
990edb42 | 551 | work = NULL; |
2152caea | 552 | write_lock(&neigh->lock); |
990edb42 MKL |
553 | if (!(neigh->nud_state & NUD_VALID) && |
554 | time_after(jiffies, | |
555 | neigh->updated + | |
556 | rt->rt6i_idev->cnf.rtr_probe_interval)) { | |
557 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
558 | if (work) | |
559 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 560 | } |
2152caea | 561 | write_unlock(&neigh->lock); |
990edb42 MKL |
562 | } else { |
563 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
f2c31e32 | 564 | } |
990edb42 MKL |
565 | |
566 | if (work) { | |
567 | INIT_WORK(&work->work, rt6_probe_deferred); | |
568 | work->target = rt->rt6i_gateway; | |
569 | dev_hold(rt->dst.dev); | |
570 | work->dev = rt->dst.dev; | |
571 | schedule_work(&work->work); | |
572 | } | |
573 | ||
8d6c31bf | 574 | out: |
2152caea | 575 | rcu_read_unlock_bh(); |
27097255 YH |
576 | } |
577 | #else | |
578 | static inline void rt6_probe(struct rt6_info *rt) | |
579 | { | |
27097255 YH |
580 | } |
581 | #endif | |
582 | ||
1da177e4 | 583 | /* |
554cfb7e | 584 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 585 | */ |
b6f99a21 | 586 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 587 | { |
d1918542 | 588 | struct net_device *dev = rt->dst.dev; |
161980f4 | 589 | if (!oif || dev->ifindex == oif) |
554cfb7e | 590 | return 2; |
161980f4 DM |
591 | if ((dev->flags & IFF_LOOPBACK) && |
592 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
593 | return 1; | |
594 | return 0; | |
554cfb7e | 595 | } |
1da177e4 | 596 | |
afc154e9 | 597 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 598 | { |
f2c31e32 | 599 | struct neighbour *neigh; |
afc154e9 | 600 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 601 | |
4d0c5911 YH |
602 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
603 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 604 | return RT6_NUD_SUCCEED; |
145a3621 YH |
605 | |
606 | rcu_read_lock_bh(); | |
607 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
608 | if (neigh) { | |
609 | read_lock(&neigh->lock); | |
554cfb7e | 610 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 611 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 612 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 613 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 614 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
615 | else |
616 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 617 | #endif |
145a3621 | 618 | read_unlock(&neigh->lock); |
afc154e9 HFS |
619 | } else { |
620 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 621 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 622 | } |
145a3621 YH |
623 | rcu_read_unlock_bh(); |
624 | ||
a5a81f0b | 625 | return ret; |
1da177e4 LT |
626 | } |
627 | ||
554cfb7e YH |
628 | static int rt6_score_route(struct rt6_info *rt, int oif, |
629 | int strict) | |
1da177e4 | 630 | { |
a5a81f0b | 631 | int m; |
1ab1457c | 632 | |
4d0c5911 | 633 | m = rt6_check_dev(rt, oif); |
77d16f45 | 634 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 635 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
636 | #ifdef CONFIG_IPV6_ROUTER_PREF |
637 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
638 | #endif | |
afc154e9 HFS |
639 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
640 | int n = rt6_check_neigh(rt); | |
641 | if (n < 0) | |
642 | return n; | |
643 | } | |
554cfb7e YH |
644 | return m; |
645 | } | |
646 | ||
f11e6659 | 647 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
648 | int *mpri, struct rt6_info *match, |
649 | bool *do_rr) | |
554cfb7e | 650 | { |
f11e6659 | 651 | int m; |
afc154e9 | 652 | bool match_do_rr = false; |
35103d11 AG |
653 | struct inet6_dev *idev = rt->rt6i_idev; |
654 | struct net_device *dev = rt->dst.dev; | |
655 | ||
656 | if (dev && !netif_carrier_ok(dev) && | |
657 | idev->cnf.ignore_routes_with_linkdown) | |
658 | goto out; | |
f11e6659 DM |
659 | |
660 | if (rt6_check_expired(rt)) | |
661 | goto out; | |
662 | ||
663 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 664 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
665 | match_do_rr = true; |
666 | m = 0; /* lowest valid score */ | |
7e980569 | 667 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 668 | goto out; |
afc154e9 HFS |
669 | } |
670 | ||
671 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
672 | rt6_probe(rt); | |
f11e6659 | 673 | |
7e980569 | 674 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 675 | if (m > *mpri) { |
afc154e9 | 676 | *do_rr = match_do_rr; |
f11e6659 DM |
677 | *mpri = m; |
678 | match = rt; | |
f11e6659 | 679 | } |
f11e6659 DM |
680 | out: |
681 | return match; | |
682 | } | |
683 | ||
684 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
685 | struct rt6_info *rr_head, | |
afc154e9 HFS |
686 | u32 metric, int oif, int strict, |
687 | bool *do_rr) | |
f11e6659 | 688 | { |
9fbdcfaf | 689 | struct rt6_info *rt, *match, *cont; |
554cfb7e | 690 | int mpri = -1; |
1da177e4 | 691 | |
f11e6659 | 692 | match = NULL; |
9fbdcfaf SK |
693 | cont = NULL; |
694 | for (rt = rr_head; rt; rt = rt->dst.rt6_next) { | |
695 | if (rt->rt6i_metric != metric) { | |
696 | cont = rt; | |
697 | break; | |
698 | } | |
699 | ||
700 | match = find_match(rt, oif, strict, &mpri, match, do_rr); | |
701 | } | |
702 | ||
703 | for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) { | |
704 | if (rt->rt6i_metric != metric) { | |
705 | cont = rt; | |
706 | break; | |
707 | } | |
708 | ||
afc154e9 | 709 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
9fbdcfaf SK |
710 | } |
711 | ||
712 | if (match || !cont) | |
713 | return match; | |
714 | ||
715 | for (rt = cont; rt; rt = rt->dst.rt6_next) | |
afc154e9 | 716 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 717 | |
f11e6659 DM |
718 | return match; |
719 | } | |
1da177e4 | 720 | |
f11e6659 DM |
721 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
722 | { | |
723 | struct rt6_info *match, *rt0; | |
8ed67789 | 724 | struct net *net; |
afc154e9 | 725 | bool do_rr = false; |
1da177e4 | 726 | |
f11e6659 DM |
727 | rt0 = fn->rr_ptr; |
728 | if (!rt0) | |
729 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 730 | |
afc154e9 HFS |
731 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
732 | &do_rr); | |
1da177e4 | 733 | |
afc154e9 | 734 | if (do_rr) { |
d8d1f30b | 735 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 736 | |
554cfb7e | 737 | /* no entries matched; do round-robin */ |
f11e6659 DM |
738 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
739 | next = fn->leaf; | |
740 | ||
741 | if (next != rt0) | |
742 | fn->rr_ptr = next; | |
1da177e4 | 743 | } |
1da177e4 | 744 | |
d1918542 | 745 | net = dev_net(rt0->dst.dev); |
a02cec21 | 746 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
747 | } |
748 | ||
8b9df265 MKL |
749 | static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt) |
750 | { | |
751 | return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)); | |
752 | } | |
753 | ||
70ceb4f5 YH |
754 | #ifdef CONFIG_IPV6_ROUTE_INFO |
755 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 756 | const struct in6_addr *gwaddr) |
70ceb4f5 | 757 | { |
c346dca1 | 758 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
759 | struct route_info *rinfo = (struct route_info *) opt; |
760 | struct in6_addr prefix_buf, *prefix; | |
761 | unsigned int pref; | |
4bed72e4 | 762 | unsigned long lifetime; |
70ceb4f5 YH |
763 | struct rt6_info *rt; |
764 | ||
765 | if (len < sizeof(struct route_info)) { | |
766 | return -EINVAL; | |
767 | } | |
768 | ||
769 | /* Sanity check for prefix_len and length */ | |
770 | if (rinfo->length > 3) { | |
771 | return -EINVAL; | |
772 | } else if (rinfo->prefix_len > 128) { | |
773 | return -EINVAL; | |
774 | } else if (rinfo->prefix_len > 64) { | |
775 | if (rinfo->length < 2) { | |
776 | return -EINVAL; | |
777 | } | |
778 | } else if (rinfo->prefix_len > 0) { | |
779 | if (rinfo->length < 1) { | |
780 | return -EINVAL; | |
781 | } | |
782 | } | |
783 | ||
784 | pref = rinfo->route_pref; | |
785 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 786 | return -EINVAL; |
70ceb4f5 | 787 | |
4bed72e4 | 788 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
789 | |
790 | if (rinfo->length == 3) | |
791 | prefix = (struct in6_addr *)rinfo->prefix; | |
792 | else { | |
793 | /* this function is safe */ | |
794 | ipv6_addr_prefix(&prefix_buf, | |
795 | (struct in6_addr *)rinfo->prefix, | |
796 | rinfo->prefix_len); | |
797 | prefix = &prefix_buf; | |
798 | } | |
799 | ||
f104a567 DJ |
800 | if (rinfo->prefix_len == 0) |
801 | rt = rt6_get_dflt_router(gwaddr, dev); | |
802 | else | |
803 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
804 | gwaddr, dev->ifindex); | |
70ceb4f5 YH |
805 | |
806 | if (rt && !lifetime) { | |
e0a1ad73 | 807 | ip6_del_rt(rt); |
70ceb4f5 YH |
808 | rt = NULL; |
809 | } | |
810 | ||
811 | if (!rt && lifetime) | |
efa2cea0 | 812 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
813 | pref); |
814 | else if (rt) | |
815 | rt->rt6i_flags = RTF_ROUTEINFO | | |
816 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
817 | ||
818 | if (rt) { | |
1716a961 G |
819 | if (!addrconf_finite_timeout(lifetime)) |
820 | rt6_clean_expires(rt); | |
821 | else | |
822 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
823 | ||
94e187c0 | 824 | ip6_rt_put(rt); |
70ceb4f5 YH |
825 | } |
826 | return 0; | |
827 | } | |
828 | #endif | |
829 | ||
a3c00e46 MKL |
830 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
831 | struct in6_addr *saddr) | |
832 | { | |
833 | struct fib6_node *pn; | |
834 | while (1) { | |
835 | if (fn->fn_flags & RTN_TL_ROOT) | |
836 | return NULL; | |
837 | pn = fn->parent; | |
838 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) | |
839 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); | |
840 | else | |
841 | fn = pn; | |
842 | if (fn->fn_flags & RTN_RTINFO) | |
843 | return fn; | |
844 | } | |
845 | } | |
c71099ac | 846 | |
8ed67789 DL |
847 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
848 | struct fib6_table *table, | |
4c9483b2 | 849 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
850 | { |
851 | struct fib6_node *fn; | |
852 | struct rt6_info *rt; | |
853 | ||
c71099ac | 854 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 855 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
856 | restart: |
857 | rt = fn->leaf; | |
4c9483b2 | 858 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 | 859 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
52bd4c0c | 860 | rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); |
a3c00e46 MKL |
861 | if (rt == net->ipv6.ip6_null_entry) { |
862 | fn = fib6_backtrack(fn, &fl6->saddr); | |
863 | if (fn) | |
864 | goto restart; | |
865 | } | |
d8d1f30b | 866 | dst_use(&rt->dst, jiffies); |
c71099ac | 867 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
868 | return rt; |
869 | ||
870 | } | |
871 | ||
67ba4152 | 872 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
ea6e574e FW |
873 | int flags) |
874 | { | |
875 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
876 | } | |
877 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
878 | ||
9acd9f3a YH |
879 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
880 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 881 | { |
4c9483b2 DM |
882 | struct flowi6 fl6 = { |
883 | .flowi6_oif = oif, | |
884 | .daddr = *daddr, | |
c71099ac TG |
885 | }; |
886 | struct dst_entry *dst; | |
77d16f45 | 887 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 888 | |
adaa70bb | 889 | if (saddr) { |
4c9483b2 | 890 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
891 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
892 | } | |
893 | ||
4c9483b2 | 894 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
895 | if (dst->error == 0) |
896 | return (struct rt6_info *) dst; | |
897 | ||
898 | dst_release(dst); | |
899 | ||
1da177e4 LT |
900 | return NULL; |
901 | } | |
7159039a YH |
902 | EXPORT_SYMBOL(rt6_lookup); |
903 | ||
c71099ac | 904 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
905 | It takes new route entry, the addition fails by any reason the |
906 | route is freed. In any case, if caller does not hold it, it may | |
907 | be destroyed. | |
908 | */ | |
909 | ||
e5fd387a | 910 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, |
e715b6d3 | 911 | struct mx6_config *mxc) |
1da177e4 LT |
912 | { |
913 | int err; | |
c71099ac | 914 | struct fib6_table *table; |
1da177e4 | 915 | |
c71099ac TG |
916 | table = rt->rt6i_table; |
917 | write_lock_bh(&table->tb6_lock); | |
e715b6d3 | 918 | err = fib6_add(&table->tb6_root, rt, info, mxc); |
c71099ac | 919 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
920 | |
921 | return err; | |
922 | } | |
923 | ||
40e22e8f TG |
924 | int ip6_ins_rt(struct rt6_info *rt) |
925 | { | |
e715b6d3 FW |
926 | struct nl_info info = { .nl_net = dev_net(rt->dst.dev), }; |
927 | struct mx6_config mxc = { .mx = NULL, }; | |
928 | ||
929 | return __ip6_ins_rt(rt, &info, &mxc); | |
40e22e8f TG |
930 | } |
931 | ||
8b9df265 MKL |
932 | static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort, |
933 | const struct in6_addr *daddr, | |
934 | const struct in6_addr *saddr) | |
1da177e4 | 935 | { |
1da177e4 LT |
936 | struct rt6_info *rt; |
937 | ||
938 | /* | |
939 | * Clone the route. | |
940 | */ | |
941 | ||
d52d3997 | 942 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) |
83a09abd | 943 | ort = (struct rt6_info *)ort->dst.from; |
1da177e4 | 944 | |
ad706862 | 945 | rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0); |
83a09abd MKL |
946 | |
947 | if (!rt) | |
948 | return NULL; | |
949 | ||
950 | ip6_rt_copy_init(rt, ort); | |
951 | rt->rt6i_flags |= RTF_CACHE; | |
952 | rt->rt6i_metric = 0; | |
953 | rt->dst.flags |= DST_HOST; | |
954 | rt->rt6i_dst.addr = *daddr; | |
955 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 956 | |
83a09abd MKL |
957 | if (!rt6_is_gw_or_nonexthop(ort)) { |
958 | if (ort->rt6i_dst.plen != 128 && | |
959 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
960 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 961 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
962 | if (rt->rt6i_src.plen && saddr) { |
963 | rt->rt6i_src.addr = *saddr; | |
964 | rt->rt6i_src.plen = 128; | |
8b9df265 | 965 | } |
83a09abd | 966 | #endif |
95a9a5ba | 967 | } |
1da177e4 | 968 | |
95a9a5ba YH |
969 | return rt; |
970 | } | |
1da177e4 | 971 | |
d52d3997 MKL |
972 | static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt) |
973 | { | |
974 | struct rt6_info *pcpu_rt; | |
975 | ||
976 | pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev), | |
ad706862 | 977 | rt->dst.dev, rt->dst.flags); |
d52d3997 MKL |
978 | |
979 | if (!pcpu_rt) | |
980 | return NULL; | |
981 | ip6_rt_copy_init(pcpu_rt, rt); | |
982 | pcpu_rt->rt6i_protocol = rt->rt6i_protocol; | |
983 | pcpu_rt->rt6i_flags |= RTF_PCPU; | |
984 | return pcpu_rt; | |
985 | } | |
986 | ||
987 | /* It should be called with read_lock_bh(&tb6_lock) acquired */ | |
988 | static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt) | |
989 | { | |
a73e4195 | 990 | struct rt6_info *pcpu_rt, **p; |
d52d3997 MKL |
991 | |
992 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
993 | pcpu_rt = *p; | |
994 | ||
a73e4195 MKL |
995 | if (pcpu_rt) { |
996 | dst_hold(&pcpu_rt->dst); | |
997 | rt6_dst_from_metrics_check(pcpu_rt); | |
998 | } | |
999 | return pcpu_rt; | |
1000 | } | |
1001 | ||
1002 | static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt) | |
1003 | { | |
9c7370a1 | 1004 | struct fib6_table *table = rt->rt6i_table; |
a73e4195 | 1005 | struct rt6_info *pcpu_rt, *prev, **p; |
d52d3997 MKL |
1006 | |
1007 | pcpu_rt = ip6_rt_pcpu_alloc(rt); | |
1008 | if (!pcpu_rt) { | |
1009 | struct net *net = dev_net(rt->dst.dev); | |
1010 | ||
9c7370a1 MKL |
1011 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
1012 | return net->ipv6.ip6_null_entry; | |
d52d3997 MKL |
1013 | } |
1014 | ||
9c7370a1 MKL |
1015 | read_lock_bh(&table->tb6_lock); |
1016 | if (rt->rt6i_pcpu) { | |
1017 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1018 | prev = cmpxchg(p, NULL, pcpu_rt); | |
1019 | if (prev) { | |
1020 | /* If someone did it before us, return prev instead */ | |
1021 | dst_destroy(&pcpu_rt->dst); | |
1022 | pcpu_rt = prev; | |
1023 | } | |
1024 | } else { | |
1025 | /* rt has been removed from the fib6 tree | |
1026 | * before we have a chance to acquire the read_lock. | |
1027 | * In this case, don't brother to create a pcpu rt | |
1028 | * since rt is going away anyway. The next | |
1029 | * dst_check() will trigger a re-lookup. | |
1030 | */ | |
d52d3997 | 1031 | dst_destroy(&pcpu_rt->dst); |
9c7370a1 | 1032 | pcpu_rt = rt; |
d52d3997 | 1033 | } |
d52d3997 MKL |
1034 | dst_hold(&pcpu_rt->dst); |
1035 | rt6_dst_from_metrics_check(pcpu_rt); | |
9c7370a1 | 1036 | read_unlock_bh(&table->tb6_lock); |
d52d3997 MKL |
1037 | return pcpu_rt; |
1038 | } | |
1039 | ||
8ed67789 | 1040 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 1041 | struct flowi6 *fl6, int flags) |
1da177e4 | 1042 | { |
367efcb9 | 1043 | struct fib6_node *fn, *saved_fn; |
45e4fd26 | 1044 | struct rt6_info *rt; |
c71099ac | 1045 | int strict = 0; |
1da177e4 | 1046 | |
77d16f45 | 1047 | strict |= flags & RT6_LOOKUP_F_IFACE; |
367efcb9 MKL |
1048 | if (net->ipv6.devconf_all->forwarding == 0) |
1049 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1da177e4 | 1050 | |
c71099ac | 1051 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 1052 | |
4c9483b2 | 1053 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 1054 | saved_fn = fn; |
1da177e4 | 1055 | |
ca254490 DA |
1056 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1057 | oif = 0; | |
1058 | ||
a3c00e46 | 1059 | redo_rt6_select: |
367efcb9 | 1060 | rt = rt6_select(fn, oif, strict); |
52bd4c0c | 1061 | if (rt->rt6i_nsiblings) |
367efcb9 | 1062 | rt = rt6_multipath_select(rt, fl6, oif, strict); |
a3c00e46 MKL |
1063 | if (rt == net->ipv6.ip6_null_entry) { |
1064 | fn = fib6_backtrack(fn, &fl6->saddr); | |
1065 | if (fn) | |
1066 | goto redo_rt6_select; | |
367efcb9 MKL |
1067 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
1068 | /* also consider unreachable route */ | |
1069 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
1070 | fn = saved_fn; | |
1071 | goto redo_rt6_select; | |
367efcb9 | 1072 | } |
a3c00e46 MKL |
1073 | } |
1074 | ||
fb9de91e | 1075 | |
3da59bd9 | 1076 | if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) { |
d52d3997 MKL |
1077 | dst_use(&rt->dst, jiffies); |
1078 | read_unlock_bh(&table->tb6_lock); | |
1079 | ||
1080 | rt6_dst_from_metrics_check(rt); | |
1081 | return rt; | |
3da59bd9 MKL |
1082 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
1083 | !(rt->rt6i_flags & RTF_GATEWAY))) { | |
1084 | /* Create a RTF_CACHE clone which will not be | |
1085 | * owned by the fib6 tree. It is for the special case where | |
1086 | * the daddr in the skb during the neighbor look-up is different | |
1087 | * from the fl6->daddr used to look-up route here. | |
1088 | */ | |
1089 | ||
1090 | struct rt6_info *uncached_rt; | |
1091 | ||
d52d3997 MKL |
1092 | dst_use(&rt->dst, jiffies); |
1093 | read_unlock_bh(&table->tb6_lock); | |
1094 | ||
3da59bd9 MKL |
1095 | uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL); |
1096 | dst_release(&rt->dst); | |
c71099ac | 1097 | |
3da59bd9 | 1098 | if (uncached_rt) |
8d0b94af | 1099 | rt6_uncached_list_add(uncached_rt); |
3da59bd9 MKL |
1100 | else |
1101 | uncached_rt = net->ipv6.ip6_null_entry; | |
d52d3997 | 1102 | |
3da59bd9 MKL |
1103 | dst_hold(&uncached_rt->dst); |
1104 | return uncached_rt; | |
3da59bd9 | 1105 | |
d52d3997 MKL |
1106 | } else { |
1107 | /* Get a percpu copy */ | |
1108 | ||
1109 | struct rt6_info *pcpu_rt; | |
1110 | ||
1111 | rt->dst.lastuse = jiffies; | |
1112 | rt->dst.__use++; | |
1113 | pcpu_rt = rt6_get_pcpu_route(rt); | |
d52d3997 | 1114 | |
9c7370a1 MKL |
1115 | if (pcpu_rt) { |
1116 | read_unlock_bh(&table->tb6_lock); | |
1117 | } else { | |
1118 | /* We have to do the read_unlock first | |
1119 | * because rt6_make_pcpu_route() may trigger | |
1120 | * ip6_dst_gc() which will take the write_lock. | |
1121 | */ | |
1122 | dst_hold(&rt->dst); | |
1123 | read_unlock_bh(&table->tb6_lock); | |
a73e4195 | 1124 | pcpu_rt = rt6_make_pcpu_route(rt); |
9c7370a1 MKL |
1125 | dst_release(&rt->dst); |
1126 | } | |
d52d3997 MKL |
1127 | |
1128 | return pcpu_rt; | |
9c7370a1 | 1129 | |
d52d3997 | 1130 | } |
1da177e4 LT |
1131 | } |
1132 | ||
8ed67789 | 1133 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 1134 | struct flowi6 *fl6, int flags) |
4acad72d | 1135 | { |
4c9483b2 | 1136 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
1137 | } |
1138 | ||
72331bc0 SL |
1139 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
1140 | struct net_device *dev, | |
1141 | struct flowi6 *fl6, int flags) | |
1142 | { | |
1143 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1144 | flags |= RT6_LOOKUP_F_IFACE; | |
1145 | ||
1146 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1147 | } | |
1148 | ||
c71099ac TG |
1149 | void ip6_route_input(struct sk_buff *skb) |
1150 | { | |
b71d1d42 | 1151 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1152 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1153 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
904af04d | 1154 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 1155 | struct flowi6 fl6 = { |
ca254490 | 1156 | .flowi6_iif = l3mdev_fib_oif(skb->dev), |
4c9483b2 DM |
1157 | .daddr = iph->daddr, |
1158 | .saddr = iph->saddr, | |
6502ca52 | 1159 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1160 | .flowi6_mark = skb->mark, |
1161 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1162 | }; |
adaa70bb | 1163 | |
904af04d | 1164 | tun_info = skb_tunnel_info(skb); |
46fa062a | 1165 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 1166 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
06e9d040 | 1167 | skb_dst_drop(skb); |
72331bc0 | 1168 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1169 | } |
1170 | ||
8ed67789 | 1171 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1172 | struct flowi6 *fl6, int flags) |
1da177e4 | 1173 | { |
4c9483b2 | 1174 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1175 | } |
1176 | ||
67ba4152 | 1177 | struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 1178 | struct flowi6 *fl6) |
c71099ac | 1179 | { |
ca254490 | 1180 | struct dst_entry *dst; |
c71099ac | 1181 | int flags = 0; |
d46a9d67 | 1182 | bool any_src; |
c71099ac | 1183 | |
ca254490 DA |
1184 | dst = l3mdev_rt6_dst_by_oif(net, fl6); |
1185 | if (dst) | |
1186 | return dst; | |
1187 | ||
1fb9489b | 1188 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1189 | |
d46a9d67 | 1190 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 1191 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 1192 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 1193 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1194 | |
d46a9d67 | 1195 | if (!any_src) |
adaa70bb | 1196 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1197 | else if (sk) |
1198 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1199 | |
4c9483b2 | 1200 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 | 1201 | } |
7159039a | 1202 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 1203 | |
2774c131 | 1204 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1205 | { |
5c1e6aa3 | 1206 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1207 | struct dst_entry *new = NULL; |
1208 | ||
f5b0a874 | 1209 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1210 | if (rt) { |
0a1f5962 | 1211 | rt6_info_init(rt); |
8104891b | 1212 | |
0a1f5962 | 1213 | new = &rt->dst; |
14e50e57 | 1214 | new->__use = 1; |
352e512c | 1215 | new->input = dst_discard; |
ede2059d | 1216 | new->output = dst_discard_out; |
14e50e57 | 1217 | |
0a1f5962 | 1218 | dst_copy_metrics(new, &ort->dst); |
14e50e57 DM |
1219 | rt->rt6i_idev = ort->rt6i_idev; |
1220 | if (rt->rt6i_idev) | |
1221 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1222 | |
4e3fd7a0 | 1223 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 1224 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
1225 | rt->rt6i_metric = 0; |
1226 | ||
1227 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1228 | #ifdef CONFIG_IPV6_SUBTREES | |
1229 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1230 | #endif | |
1231 | ||
1232 | dst_free(new); | |
1233 | } | |
1234 | ||
69ead7af DM |
1235 | dst_release(dst_orig); |
1236 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1237 | } |
14e50e57 | 1238 | |
1da177e4 LT |
1239 | /* |
1240 | * Destination cache support functions | |
1241 | */ | |
1242 | ||
4b32b5ad MKL |
1243 | static void rt6_dst_from_metrics_check(struct rt6_info *rt) |
1244 | { | |
1245 | if (rt->dst.from && | |
1246 | dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from)) | |
1247 | dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true); | |
1248 | } | |
1249 | ||
3da59bd9 MKL |
1250 | static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie) |
1251 | { | |
1252 | if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) | |
1253 | return NULL; | |
1254 | ||
1255 | if (rt6_check_expired(rt)) | |
1256 | return NULL; | |
1257 | ||
1258 | return &rt->dst; | |
1259 | } | |
1260 | ||
1261 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie) | |
1262 | { | |
5973fb1e MKL |
1263 | if (!__rt6_check_expired(rt) && |
1264 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
3da59bd9 MKL |
1265 | rt6_check((struct rt6_info *)(rt->dst.from), cookie)) |
1266 | return &rt->dst; | |
1267 | else | |
1268 | return NULL; | |
1269 | } | |
1270 | ||
1da177e4 LT |
1271 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
1272 | { | |
1273 | struct rt6_info *rt; | |
1274 | ||
1275 | rt = (struct rt6_info *) dst; | |
1276 | ||
6f3118b5 ND |
1277 | /* All IPV6 dsts are created with ->obsolete set to the value |
1278 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1279 | * into this function always. | |
1280 | */ | |
e3bc10bd | 1281 | |
4b32b5ad MKL |
1282 | rt6_dst_from_metrics_check(rt); |
1283 | ||
02bcf4e0 MKL |
1284 | if (rt->rt6i_flags & RTF_PCPU || |
1285 | (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from)) | |
3da59bd9 MKL |
1286 | return rt6_dst_from_check(rt, cookie); |
1287 | else | |
1288 | return rt6_check(rt, cookie); | |
1da177e4 LT |
1289 | } |
1290 | ||
1291 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1292 | { | |
1293 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1294 | ||
1295 | if (rt) { | |
54c1a859 YH |
1296 | if (rt->rt6i_flags & RTF_CACHE) { |
1297 | if (rt6_check_expired(rt)) { | |
1298 | ip6_del_rt(rt); | |
1299 | dst = NULL; | |
1300 | } | |
1301 | } else { | |
1da177e4 | 1302 | dst_release(dst); |
54c1a859 YH |
1303 | dst = NULL; |
1304 | } | |
1da177e4 | 1305 | } |
54c1a859 | 1306 | return dst; |
1da177e4 LT |
1307 | } |
1308 | ||
1309 | static void ip6_link_failure(struct sk_buff *skb) | |
1310 | { | |
1311 | struct rt6_info *rt; | |
1312 | ||
3ffe533c | 1313 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1314 | |
adf30907 | 1315 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1316 | if (rt) { |
1eb4f758 HFS |
1317 | if (rt->rt6i_flags & RTF_CACHE) { |
1318 | dst_hold(&rt->dst); | |
8e3d5be7 | 1319 | ip6_del_rt(rt); |
1eb4f758 | 1320 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { |
1da177e4 | 1321 | rt->rt6i_node->fn_sernum = -1; |
1eb4f758 | 1322 | } |
1da177e4 LT |
1323 | } |
1324 | } | |
1325 | ||
45e4fd26 MKL |
1326 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
1327 | { | |
1328 | struct net *net = dev_net(rt->dst.dev); | |
1329 | ||
1330 | rt->rt6i_flags |= RTF_MODIFIED; | |
1331 | rt->rt6i_pmtu = mtu; | |
1332 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
1333 | } | |
1334 | ||
0d3f6d29 MKL |
1335 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
1336 | { | |
1337 | return !(rt->rt6i_flags & RTF_CACHE) && | |
1338 | (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node); | |
1339 | } | |
1340 | ||
45e4fd26 MKL |
1341 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
1342 | const struct ipv6hdr *iph, u32 mtu) | |
1da177e4 | 1343 | { |
67ba4152 | 1344 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 1345 | |
45e4fd26 MKL |
1346 | if (rt6->rt6i_flags & RTF_LOCAL) |
1347 | return; | |
81aded24 | 1348 | |
45e4fd26 MKL |
1349 | dst_confirm(dst); |
1350 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); | |
1351 | if (mtu >= dst_mtu(dst)) | |
1352 | return; | |
9d289715 | 1353 | |
0d3f6d29 | 1354 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 MKL |
1355 | rt6_do_update_pmtu(rt6, mtu); |
1356 | } else { | |
1357 | const struct in6_addr *daddr, *saddr; | |
1358 | struct rt6_info *nrt6; | |
1359 | ||
1360 | if (iph) { | |
1361 | daddr = &iph->daddr; | |
1362 | saddr = &iph->saddr; | |
1363 | } else if (sk) { | |
1364 | daddr = &sk->sk_v6_daddr; | |
1365 | saddr = &inet6_sk(sk)->saddr; | |
1366 | } else { | |
1367 | return; | |
1368 | } | |
1369 | nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr); | |
1370 | if (nrt6) { | |
1371 | rt6_do_update_pmtu(nrt6, mtu); | |
1372 | ||
1373 | /* ip6_ins_rt(nrt6) will bump the | |
1374 | * rt6->rt6i_node->fn_sernum | |
1375 | * which will fail the next rt6_check() and | |
1376 | * invalidate the sk->sk_dst_cache. | |
1377 | */ | |
1378 | ip6_ins_rt(nrt6); | |
1379 | } | |
1da177e4 LT |
1380 | } |
1381 | } | |
1382 | ||
45e4fd26 MKL |
1383 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1384 | struct sk_buff *skb, u32 mtu) | |
1385 | { | |
1386 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu); | |
1387 | } | |
1388 | ||
42ae66c8 DM |
1389 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
1390 | int oif, u32 mark) | |
81aded24 DM |
1391 | { |
1392 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1393 | struct dst_entry *dst; | |
1394 | struct flowi6 fl6; | |
1395 | ||
1396 | memset(&fl6, 0, sizeof(fl6)); | |
1397 | fl6.flowi6_oif = oif; | |
1b3c61dc | 1398 | fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); |
81aded24 DM |
1399 | fl6.daddr = iph->daddr; |
1400 | fl6.saddr = iph->saddr; | |
6502ca52 | 1401 | fl6.flowlabel = ip6_flowinfo(iph); |
81aded24 DM |
1402 | |
1403 | dst = ip6_route_output(net, NULL, &fl6); | |
1404 | if (!dst->error) | |
45e4fd26 | 1405 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu)); |
81aded24 DM |
1406 | dst_release(dst); |
1407 | } | |
1408 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1409 | ||
1410 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1411 | { | |
1412 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
1413 | sk->sk_bound_dev_if, sk->sk_mark); | |
1414 | } | |
1415 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1416 | ||
b55b76b2 DJ |
1417 | /* Handle redirects */ |
1418 | struct ip6rd_flowi { | |
1419 | struct flowi6 fl6; | |
1420 | struct in6_addr gateway; | |
1421 | }; | |
1422 | ||
1423 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
1424 | struct fib6_table *table, | |
1425 | struct flowi6 *fl6, | |
1426 | int flags) | |
1427 | { | |
1428 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
1429 | struct rt6_info *rt; | |
1430 | struct fib6_node *fn; | |
1431 | ||
1432 | /* Get the "current" route for this destination and | |
1433 | * check if the redirect has come from approriate router. | |
1434 | * | |
1435 | * RFC 4861 specifies that redirects should only be | |
1436 | * accepted if they come from the nexthop to the target. | |
1437 | * Due to the way the routes are chosen, this notion | |
1438 | * is a bit fuzzy and one might need to check all possible | |
1439 | * routes. | |
1440 | */ | |
1441 | ||
1442 | read_lock_bh(&table->tb6_lock); | |
1443 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); | |
1444 | restart: | |
1445 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { | |
1446 | if (rt6_check_expired(rt)) | |
1447 | continue; | |
1448 | if (rt->dst.error) | |
1449 | break; | |
1450 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1451 | continue; | |
1452 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) | |
1453 | continue; | |
1454 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) | |
1455 | continue; | |
1456 | break; | |
1457 | } | |
1458 | ||
1459 | if (!rt) | |
1460 | rt = net->ipv6.ip6_null_entry; | |
1461 | else if (rt->dst.error) { | |
1462 | rt = net->ipv6.ip6_null_entry; | |
b0a1ba59 MKL |
1463 | goto out; |
1464 | } | |
1465 | ||
1466 | if (rt == net->ipv6.ip6_null_entry) { | |
a3c00e46 MKL |
1467 | fn = fib6_backtrack(fn, &fl6->saddr); |
1468 | if (fn) | |
1469 | goto restart; | |
b55b76b2 | 1470 | } |
a3c00e46 | 1471 | |
b0a1ba59 | 1472 | out: |
b55b76b2 DJ |
1473 | dst_hold(&rt->dst); |
1474 | ||
1475 | read_unlock_bh(&table->tb6_lock); | |
1476 | ||
1477 | return rt; | |
1478 | }; | |
1479 | ||
1480 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
1481 | const struct flowi6 *fl6, | |
1482 | const struct in6_addr *gateway) | |
1483 | { | |
1484 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
1485 | struct ip6rd_flowi rdfl; | |
1486 | ||
1487 | rdfl.fl6 = *fl6; | |
1488 | rdfl.gateway = *gateway; | |
1489 | ||
1490 | return fib6_rule_lookup(net, &rdfl.fl6, | |
1491 | flags, __ip6_route_redirect); | |
1492 | } | |
1493 | ||
3a5ad2ee DM |
1494 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1495 | { | |
1496 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1497 | struct dst_entry *dst; | |
1498 | struct flowi6 fl6; | |
1499 | ||
1500 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1501 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
3a5ad2ee DM |
1502 | fl6.flowi6_oif = oif; |
1503 | fl6.flowi6_mark = mark; | |
3a5ad2ee DM |
1504 | fl6.daddr = iph->daddr; |
1505 | fl6.saddr = iph->saddr; | |
6502ca52 | 1506 | fl6.flowlabel = ip6_flowinfo(iph); |
3a5ad2ee | 1507 | |
b55b76b2 DJ |
1508 | dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
1509 | rt6_do_redirect(dst, NULL, skb); | |
3a5ad2ee DM |
1510 | dst_release(dst); |
1511 | } | |
1512 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1513 | ||
c92a59ec DJ |
1514 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
1515 | u32 mark) | |
1516 | { | |
1517 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1518 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
1519 | struct dst_entry *dst; | |
1520 | struct flowi6 fl6; | |
1521 | ||
1522 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1523 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
c92a59ec DJ |
1524 | fl6.flowi6_oif = oif; |
1525 | fl6.flowi6_mark = mark; | |
c92a59ec DJ |
1526 | fl6.daddr = msg->dest; |
1527 | fl6.saddr = iph->daddr; | |
1528 | ||
b55b76b2 DJ |
1529 | dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
1530 | rt6_do_redirect(dst, NULL, skb); | |
c92a59ec DJ |
1531 | dst_release(dst); |
1532 | } | |
1533 | ||
3a5ad2ee DM |
1534 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
1535 | { | |
1536 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1537 | } | |
1538 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1539 | ||
0dbaee3b | 1540 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1541 | { |
0dbaee3b DM |
1542 | struct net_device *dev = dst->dev; |
1543 | unsigned int mtu = dst_mtu(dst); | |
1544 | struct net *net = dev_net(dev); | |
1545 | ||
1da177e4 LT |
1546 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1547 | ||
5578689a DL |
1548 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1549 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1550 | |
1551 | /* | |
1ab1457c YH |
1552 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1553 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1554 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1555 | * rely only on pmtu discovery" |
1556 | */ | |
1557 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1558 | mtu = IPV6_MAXPLEN; | |
1559 | return mtu; | |
1560 | } | |
1561 | ||
ebb762f2 | 1562 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1563 | { |
4b32b5ad MKL |
1564 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
1565 | unsigned int mtu = rt->rt6i_pmtu; | |
d33e4553 | 1566 | struct inet6_dev *idev; |
618f9bc7 | 1567 | |
4b32b5ad MKL |
1568 | if (mtu) |
1569 | goto out; | |
1570 | ||
1571 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 1572 | if (mtu) |
30f78d8e | 1573 | goto out; |
618f9bc7 SK |
1574 | |
1575 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1576 | |
1577 | rcu_read_lock(); | |
1578 | idev = __in6_dev_get(dst->dev); | |
1579 | if (idev) | |
1580 | mtu = idev->cnf.mtu6; | |
1581 | rcu_read_unlock(); | |
1582 | ||
30f78d8e ED |
1583 | out: |
1584 | return min_t(unsigned int, mtu, IP6_MAX_MTU); | |
d33e4553 DM |
1585 | } |
1586 | ||
3b00944c YH |
1587 | static struct dst_entry *icmp6_dst_gc_list; |
1588 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1589 | |
3b00944c | 1590 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1591 | struct flowi6 *fl6) |
1da177e4 | 1592 | { |
87a11578 | 1593 | struct dst_entry *dst; |
1da177e4 LT |
1594 | struct rt6_info *rt; |
1595 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1596 | struct net *net = dev_net(dev); |
1da177e4 | 1597 | |
38308473 | 1598 | if (unlikely(!idev)) |
122bdf67 | 1599 | return ERR_PTR(-ENODEV); |
1da177e4 | 1600 | |
ad706862 | 1601 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 1602 | if (unlikely(!rt)) { |
1da177e4 | 1603 | in6_dev_put(idev); |
87a11578 | 1604 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1605 | goto out; |
1606 | } | |
1607 | ||
8e2ec639 YZ |
1608 | rt->dst.flags |= DST_HOST; |
1609 | rt->dst.output = ip6_output; | |
d8d1f30b | 1610 | atomic_set(&rt->dst.__refcnt, 1); |
550bab42 | 1611 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 1612 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1613 | rt->rt6i_dst.plen = 128; |
1614 | rt->rt6i_idev = idev; | |
14edd87d | 1615 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1616 | |
3b00944c | 1617 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1618 | rt->dst.next = icmp6_dst_gc_list; |
1619 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1620 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1621 | |
5578689a | 1622 | fib6_force_start_gc(net); |
1da177e4 | 1623 | |
87a11578 DM |
1624 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1625 | ||
1da177e4 | 1626 | out: |
87a11578 | 1627 | return dst; |
1da177e4 LT |
1628 | } |
1629 | ||
3d0f24a7 | 1630 | int icmp6_dst_gc(void) |
1da177e4 | 1631 | { |
e9476e95 | 1632 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1633 | int more = 0; |
1da177e4 | 1634 | |
3b00944c YH |
1635 | spin_lock_bh(&icmp6_dst_lock); |
1636 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1637 | |
1da177e4 LT |
1638 | while ((dst = *pprev) != NULL) { |
1639 | if (!atomic_read(&dst->__refcnt)) { | |
1640 | *pprev = dst->next; | |
1641 | dst_free(dst); | |
1da177e4 LT |
1642 | } else { |
1643 | pprev = &dst->next; | |
3d0f24a7 | 1644 | ++more; |
1da177e4 LT |
1645 | } |
1646 | } | |
1647 | ||
3b00944c | 1648 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1649 | |
3d0f24a7 | 1650 | return more; |
1da177e4 LT |
1651 | } |
1652 | ||
1e493d19 DM |
1653 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1654 | void *arg) | |
1655 | { | |
1656 | struct dst_entry *dst, **pprev; | |
1657 | ||
1658 | spin_lock_bh(&icmp6_dst_lock); | |
1659 | pprev = &icmp6_dst_gc_list; | |
1660 | while ((dst = *pprev) != NULL) { | |
1661 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1662 | if (func(rt, arg)) { | |
1663 | *pprev = dst->next; | |
1664 | dst_free(dst); | |
1665 | } else { | |
1666 | pprev = &dst->next; | |
1667 | } | |
1668 | } | |
1669 | spin_unlock_bh(&icmp6_dst_lock); | |
1670 | } | |
1671 | ||
569d3645 | 1672 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1673 | { |
86393e52 | 1674 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1675 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1676 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1677 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1678 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1679 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1680 | int entries; |
7019b78e | 1681 | |
fc66f95c | 1682 | entries = dst_entries_get_fast(ops); |
49a18d86 | 1683 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 1684 | entries <= rt_max_size) |
1da177e4 LT |
1685 | goto out; |
1686 | ||
6891a346 | 1687 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 1688 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
1689 | entries = dst_entries_get_slow(ops); |
1690 | if (entries < ops->gc_thresh) | |
7019b78e | 1691 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1692 | out: |
7019b78e | 1693 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1694 | return entries > rt_max_size; |
1da177e4 LT |
1695 | } |
1696 | ||
e715b6d3 FW |
1697 | static int ip6_convert_metrics(struct mx6_config *mxc, |
1698 | const struct fib6_config *cfg) | |
1699 | { | |
c3a8d947 | 1700 | bool ecn_ca = false; |
e715b6d3 FW |
1701 | struct nlattr *nla; |
1702 | int remaining; | |
1703 | u32 *mp; | |
1704 | ||
63159f29 | 1705 | if (!cfg->fc_mx) |
e715b6d3 FW |
1706 | return 0; |
1707 | ||
1708 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1709 | if (unlikely(!mp)) | |
1710 | return -ENOMEM; | |
1711 | ||
1712 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1713 | int type = nla_type(nla); | |
1bb14807 | 1714 | u32 val; |
e715b6d3 | 1715 | |
1bb14807 DB |
1716 | if (!type) |
1717 | continue; | |
1718 | if (unlikely(type > RTAX_MAX)) | |
1719 | goto err; | |
ea697639 | 1720 | |
1bb14807 DB |
1721 | if (type == RTAX_CC_ALGO) { |
1722 | char tmp[TCP_CA_NAME_MAX]; | |
e715b6d3 | 1723 | |
1bb14807 | 1724 | nla_strlcpy(tmp, nla, sizeof(tmp)); |
c3a8d947 | 1725 | val = tcp_ca_get_key_by_name(tmp, &ecn_ca); |
1bb14807 DB |
1726 | if (val == TCP_CA_UNSPEC) |
1727 | goto err; | |
1728 | } else { | |
1729 | val = nla_get_u32(nla); | |
e715b6d3 | 1730 | } |
b8d3e416 DB |
1731 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
1732 | goto err; | |
1bb14807 DB |
1733 | |
1734 | mp[type - 1] = val; | |
1735 | __set_bit(type - 1, mxc->mx_valid); | |
e715b6d3 FW |
1736 | } |
1737 | ||
c3a8d947 DB |
1738 | if (ecn_ca) { |
1739 | __set_bit(RTAX_FEATURES - 1, mxc->mx_valid); | |
1740 | mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; | |
1741 | } | |
e715b6d3 | 1742 | |
c3a8d947 | 1743 | mxc->mx = mp; |
e715b6d3 FW |
1744 | return 0; |
1745 | err: | |
1746 | kfree(mp); | |
1747 | return -EINVAL; | |
1748 | } | |
1da177e4 | 1749 | |
8c5b83f0 | 1750 | static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg) |
1da177e4 | 1751 | { |
5578689a | 1752 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1753 | struct rt6_info *rt = NULL; |
1754 | struct net_device *dev = NULL; | |
1755 | struct inet6_dev *idev = NULL; | |
c71099ac | 1756 | struct fib6_table *table; |
1da177e4 | 1757 | int addr_type; |
8c5b83f0 | 1758 | int err = -EINVAL; |
1da177e4 | 1759 | |
86872cb5 | 1760 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
8c5b83f0 | 1761 | goto out; |
1da177e4 | 1762 | #ifndef CONFIG_IPV6_SUBTREES |
86872cb5 | 1763 | if (cfg->fc_src_len) |
8c5b83f0 | 1764 | goto out; |
1da177e4 | 1765 | #endif |
86872cb5 | 1766 | if (cfg->fc_ifindex) { |
1da177e4 | 1767 | err = -ENODEV; |
5578689a | 1768 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1769 | if (!dev) |
1770 | goto out; | |
1771 | idev = in6_dev_get(dev); | |
1772 | if (!idev) | |
1773 | goto out; | |
1774 | } | |
1775 | ||
86872cb5 TG |
1776 | if (cfg->fc_metric == 0) |
1777 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1778 | |
d71314b4 | 1779 | err = -ENOBUFS; |
38308473 DM |
1780 | if (cfg->fc_nlinfo.nlh && |
1781 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1782 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1783 | if (!table) { |
f3213831 | 1784 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1785 | table = fib6_new_table(net, cfg->fc_table); |
1786 | } | |
1787 | } else { | |
1788 | table = fib6_new_table(net, cfg->fc_table); | |
1789 | } | |
38308473 DM |
1790 | |
1791 | if (!table) | |
c71099ac | 1792 | goto out; |
c71099ac | 1793 | |
ad706862 MKL |
1794 | rt = ip6_dst_alloc(net, NULL, |
1795 | (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT); | |
1da177e4 | 1796 | |
38308473 | 1797 | if (!rt) { |
1da177e4 LT |
1798 | err = -ENOMEM; |
1799 | goto out; | |
1800 | } | |
1801 | ||
1716a961 G |
1802 | if (cfg->fc_flags & RTF_EXPIRES) |
1803 | rt6_set_expires(rt, jiffies + | |
1804 | clock_t_to_jiffies(cfg->fc_expires)); | |
1805 | else | |
1806 | rt6_clean_expires(rt); | |
1da177e4 | 1807 | |
86872cb5 TG |
1808 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1809 | cfg->fc_protocol = RTPROT_BOOT; | |
1810 | rt->rt6i_protocol = cfg->fc_protocol; | |
1811 | ||
1812 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1813 | |
1814 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1815 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1816 | else if (cfg->fc_flags & RTF_LOCAL) |
1817 | rt->dst.input = ip6_input; | |
1da177e4 | 1818 | else |
d8d1f30b | 1819 | rt->dst.input = ip6_forward; |
1da177e4 | 1820 | |
d8d1f30b | 1821 | rt->dst.output = ip6_output; |
1da177e4 | 1822 | |
19e42e45 RP |
1823 | if (cfg->fc_encap) { |
1824 | struct lwtunnel_state *lwtstate; | |
1825 | ||
1826 | err = lwtunnel_build_state(dev, cfg->fc_encap_type, | |
127eb7cd TH |
1827 | cfg->fc_encap, AF_INET6, cfg, |
1828 | &lwtstate); | |
19e42e45 RP |
1829 | if (err) |
1830 | goto out; | |
61adedf3 JB |
1831 | rt->dst.lwtstate = lwtstate_get(lwtstate); |
1832 | if (lwtunnel_output_redirect(rt->dst.lwtstate)) { | |
1833 | rt->dst.lwtstate->orig_output = rt->dst.output; | |
1834 | rt->dst.output = lwtunnel_output; | |
25368623 | 1835 | } |
61adedf3 JB |
1836 | if (lwtunnel_input_redirect(rt->dst.lwtstate)) { |
1837 | rt->dst.lwtstate->orig_input = rt->dst.input; | |
1838 | rt->dst.input = lwtunnel_input; | |
25368623 | 1839 | } |
19e42e45 RP |
1840 | } |
1841 | ||
86872cb5 TG |
1842 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1843 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
afc4eef8 | 1844 | if (rt->rt6i_dst.plen == 128) |
e5fd387a | 1845 | rt->dst.flags |= DST_HOST; |
e5fd387a | 1846 | |
1da177e4 | 1847 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1848 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1849 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1850 | #endif |
1851 | ||
86872cb5 | 1852 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1853 | |
1854 | /* We cannot add true routes via loopback here, | |
1855 | they would result in kernel looping; promote them to reject routes | |
1856 | */ | |
86872cb5 | 1857 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1858 | (dev && (dev->flags & IFF_LOOPBACK) && |
1859 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1860 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1861 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1862 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1863 | if (dev) { |
1864 | dev_put(dev); | |
1865 | in6_dev_put(idev); | |
1866 | } | |
5578689a | 1867 | dev = net->loopback_dev; |
1da177e4 LT |
1868 | dev_hold(dev); |
1869 | idev = in6_dev_get(dev); | |
1870 | if (!idev) { | |
1871 | err = -ENODEV; | |
1872 | goto out; | |
1873 | } | |
1874 | } | |
1da177e4 | 1875 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1876 | switch (cfg->fc_type) { |
1877 | case RTN_BLACKHOLE: | |
1878 | rt->dst.error = -EINVAL; | |
ede2059d | 1879 | rt->dst.output = dst_discard_out; |
7150aede | 1880 | rt->dst.input = dst_discard; |
ef2c7d7b ND |
1881 | break; |
1882 | case RTN_PROHIBIT: | |
1883 | rt->dst.error = -EACCES; | |
7150aede K |
1884 | rt->dst.output = ip6_pkt_prohibit_out; |
1885 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 1886 | break; |
b4949ab2 | 1887 | case RTN_THROW: |
0315e382 | 1888 | case RTN_UNREACHABLE: |
ef2c7d7b | 1889 | default: |
7150aede | 1890 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
0315e382 NF |
1891 | : (cfg->fc_type == RTN_UNREACHABLE) |
1892 | ? -EHOSTUNREACH : -ENETUNREACH; | |
7150aede K |
1893 | rt->dst.output = ip6_pkt_discard_out; |
1894 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
1895 | break; |
1896 | } | |
1da177e4 LT |
1897 | goto install_route; |
1898 | } | |
1899 | ||
86872cb5 | 1900 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1901 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1902 | int gwa_type; |
1903 | ||
86872cb5 | 1904 | gw_addr = &cfg->fc_gateway; |
330567b7 | 1905 | gwa_type = ipv6_addr_type(gw_addr); |
48ed7b26 FW |
1906 | |
1907 | /* if gw_addr is local we will fail to detect this in case | |
1908 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
1909 | * will return already-added prefix route via interface that | |
1910 | * prefix route was assigned to, which might be non-loopback. | |
1911 | */ | |
1912 | err = -EINVAL; | |
330567b7 FW |
1913 | if (ipv6_chk_addr_and_flags(net, gw_addr, |
1914 | gwa_type & IPV6_ADDR_LINKLOCAL ? | |
1915 | dev : NULL, 0, 0)) | |
48ed7b26 FW |
1916 | goto out; |
1917 | ||
4e3fd7a0 | 1918 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1919 | |
1920 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1921 | struct rt6_info *grt; | |
1922 | ||
1923 | /* IPv6 strictly inhibits using not link-local | |
1924 | addresses as nexthop address. | |
1925 | Otherwise, router will not able to send redirects. | |
1926 | It is very good, but in some (rare!) circumstances | |
1927 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1928 | some exceptions. --ANK | |
1929 | */ | |
38308473 | 1930 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1931 | goto out; |
1932 | ||
5578689a | 1933 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1934 | |
1935 | err = -EHOSTUNREACH; | |
38308473 | 1936 | if (!grt) |
1da177e4 LT |
1937 | goto out; |
1938 | if (dev) { | |
d1918542 | 1939 | if (dev != grt->dst.dev) { |
94e187c0 | 1940 | ip6_rt_put(grt); |
1da177e4 LT |
1941 | goto out; |
1942 | } | |
1943 | } else { | |
d1918542 | 1944 | dev = grt->dst.dev; |
1da177e4 LT |
1945 | idev = grt->rt6i_idev; |
1946 | dev_hold(dev); | |
1947 | in6_dev_hold(grt->rt6i_idev); | |
1948 | } | |
38308473 | 1949 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1950 | err = 0; |
94e187c0 | 1951 | ip6_rt_put(grt); |
1da177e4 LT |
1952 | |
1953 | if (err) | |
1954 | goto out; | |
1955 | } | |
1956 | err = -EINVAL; | |
38308473 | 1957 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1958 | goto out; |
1959 | } | |
1960 | ||
1961 | err = -ENODEV; | |
38308473 | 1962 | if (!dev) |
1da177e4 LT |
1963 | goto out; |
1964 | ||
c3968a85 DW |
1965 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1966 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1967 | err = -EINVAL; | |
1968 | goto out; | |
1969 | } | |
4e3fd7a0 | 1970 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1971 | rt->rt6i_prefsrc.plen = 128; |
1972 | } else | |
1973 | rt->rt6i_prefsrc.plen = 0; | |
1974 | ||
86872cb5 | 1975 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1976 | |
1977 | install_route: | |
d8d1f30b | 1978 | rt->dst.dev = dev; |
1da177e4 | 1979 | rt->rt6i_idev = idev; |
c71099ac | 1980 | rt->rt6i_table = table; |
63152fc0 | 1981 | |
c346dca1 | 1982 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1983 | |
8c5b83f0 | 1984 | return rt; |
6b9ea5a6 RP |
1985 | out: |
1986 | if (dev) | |
1987 | dev_put(dev); | |
1988 | if (idev) | |
1989 | in6_dev_put(idev); | |
1990 | if (rt) | |
1991 | dst_free(&rt->dst); | |
1992 | ||
8c5b83f0 | 1993 | return ERR_PTR(err); |
6b9ea5a6 RP |
1994 | } |
1995 | ||
1996 | int ip6_route_add(struct fib6_config *cfg) | |
1997 | { | |
1998 | struct mx6_config mxc = { .mx = NULL, }; | |
8c5b83f0 | 1999 | struct rt6_info *rt; |
6b9ea5a6 RP |
2000 | int err; |
2001 | ||
8c5b83f0 RP |
2002 | rt = ip6_route_info_create(cfg); |
2003 | if (IS_ERR(rt)) { | |
2004 | err = PTR_ERR(rt); | |
2005 | rt = NULL; | |
6b9ea5a6 | 2006 | goto out; |
8c5b83f0 | 2007 | } |
6b9ea5a6 | 2008 | |
e715b6d3 FW |
2009 | err = ip6_convert_metrics(&mxc, cfg); |
2010 | if (err) | |
2011 | goto out; | |
1da177e4 | 2012 | |
e715b6d3 FW |
2013 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc); |
2014 | ||
2015 | kfree(mxc.mx); | |
6b9ea5a6 | 2016 | |
e715b6d3 | 2017 | return err; |
1da177e4 | 2018 | out: |
1da177e4 | 2019 | if (rt) |
d8d1f30b | 2020 | dst_free(&rt->dst); |
6b9ea5a6 | 2021 | |
1da177e4 LT |
2022 | return err; |
2023 | } | |
2024 | ||
86872cb5 | 2025 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2026 | { |
2027 | int err; | |
c71099ac | 2028 | struct fib6_table *table; |
d1918542 | 2029 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 2030 | |
8e3d5be7 MKL |
2031 | if (rt == net->ipv6.ip6_null_entry || |
2032 | rt->dst.flags & DST_NOCACHE) { | |
6825a26c G |
2033 | err = -ENOENT; |
2034 | goto out; | |
2035 | } | |
6c813a72 | 2036 | |
c71099ac TG |
2037 | table = rt->rt6i_table; |
2038 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 2039 | err = fib6_del(rt, info); |
c71099ac | 2040 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 2041 | |
6825a26c | 2042 | out: |
94e187c0 | 2043 | ip6_rt_put(rt); |
1da177e4 LT |
2044 | return err; |
2045 | } | |
2046 | ||
e0a1ad73 TG |
2047 | int ip6_del_rt(struct rt6_info *rt) |
2048 | { | |
4d1169c1 | 2049 | struct nl_info info = { |
d1918542 | 2050 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 2051 | }; |
528c4ceb | 2052 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
2053 | } |
2054 | ||
86872cb5 | 2055 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 2056 | { |
c71099ac | 2057 | struct fib6_table *table; |
1da177e4 LT |
2058 | struct fib6_node *fn; |
2059 | struct rt6_info *rt; | |
2060 | int err = -ESRCH; | |
2061 | ||
5578689a | 2062 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 2063 | if (!table) |
c71099ac TG |
2064 | return err; |
2065 | ||
2066 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 2067 | |
c71099ac | 2068 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
2069 | &cfg->fc_dst, cfg->fc_dst_len, |
2070 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 2071 | |
1da177e4 | 2072 | if (fn) { |
d8d1f30b | 2073 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
1f56a01f MKL |
2074 | if ((rt->rt6i_flags & RTF_CACHE) && |
2075 | !(cfg->fc_flags & RTF_CACHE)) | |
2076 | continue; | |
86872cb5 | 2077 | if (cfg->fc_ifindex && |
d1918542 DM |
2078 | (!rt->dst.dev || |
2079 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 2080 | continue; |
86872cb5 TG |
2081 | if (cfg->fc_flags & RTF_GATEWAY && |
2082 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 2083 | continue; |
86872cb5 | 2084 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 2085 | continue; |
d8d1f30b | 2086 | dst_hold(&rt->dst); |
c71099ac | 2087 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 2088 | |
86872cb5 | 2089 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
2090 | } |
2091 | } | |
c71099ac | 2092 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2093 | |
2094 | return err; | |
2095 | } | |
2096 | ||
6700c270 | 2097 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 2098 | { |
a6279458 | 2099 | struct netevent_redirect netevent; |
e8599ff4 | 2100 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
2101 | struct ndisc_options ndopts; |
2102 | struct inet6_dev *in6_dev; | |
2103 | struct neighbour *neigh; | |
71bcdba0 | 2104 | struct rd_msg *msg; |
6e157b6a DM |
2105 | int optlen, on_link; |
2106 | u8 *lladdr; | |
e8599ff4 | 2107 | |
29a3cad5 | 2108 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 2109 | optlen -= sizeof(*msg); |
e8599ff4 DM |
2110 | |
2111 | if (optlen < 0) { | |
6e157b6a | 2112 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
2113 | return; |
2114 | } | |
2115 | ||
71bcdba0 | 2116 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 2117 | |
71bcdba0 | 2118 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 2119 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
2120 | return; |
2121 | } | |
2122 | ||
6e157b6a | 2123 | on_link = 0; |
71bcdba0 | 2124 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 2125 | on_link = 1; |
71bcdba0 | 2126 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 2127 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 2128 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
2129 | return; |
2130 | } | |
2131 | ||
2132 | in6_dev = __in6_dev_get(skb->dev); | |
2133 | if (!in6_dev) | |
2134 | return; | |
2135 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
2136 | return; | |
2137 | ||
2138 | /* RFC2461 8.1: | |
2139 | * The IP source address of the Redirect MUST be the same as the current | |
2140 | * first-hop router for the specified ICMP Destination Address. | |
2141 | */ | |
2142 | ||
71bcdba0 | 2143 | if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
2144 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
2145 | return; | |
2146 | } | |
6e157b6a DM |
2147 | |
2148 | lladdr = NULL; | |
e8599ff4 DM |
2149 | if (ndopts.nd_opts_tgt_lladdr) { |
2150 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
2151 | skb->dev); | |
2152 | if (!lladdr) { | |
2153 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
2154 | return; | |
2155 | } | |
2156 | } | |
2157 | ||
6e157b6a | 2158 | rt = (struct rt6_info *) dst; |
ec13ad1d | 2159 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 2160 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 2161 | return; |
6e157b6a | 2162 | } |
e8599ff4 | 2163 | |
6e157b6a DM |
2164 | /* Redirect received -> path was valid. |
2165 | * Look, redirects are sent only in response to data packets, | |
2166 | * so that this nexthop apparently is reachable. --ANK | |
2167 | */ | |
2168 | dst_confirm(&rt->dst); | |
a6279458 | 2169 | |
71bcdba0 | 2170 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
2171 | if (!neigh) |
2172 | return; | |
a6279458 | 2173 | |
1da177e4 LT |
2174 | /* |
2175 | * We have finally decided to accept it. | |
2176 | */ | |
2177 | ||
1ab1457c | 2178 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
2179 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
2180 | NEIGH_UPDATE_F_OVERRIDE| | |
2181 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
2182 | NEIGH_UPDATE_F_ISROUTER)) | |
2183 | ); | |
2184 | ||
83a09abd | 2185 | nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL); |
38308473 | 2186 | if (!nrt) |
1da177e4 LT |
2187 | goto out; |
2188 | ||
2189 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
2190 | if (on_link) | |
2191 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
2192 | ||
4e3fd7a0 | 2193 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 2194 | |
40e22e8f | 2195 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
2196 | goto out; |
2197 | ||
d8d1f30b CG |
2198 | netevent.old = &rt->dst; |
2199 | netevent.new = &nrt->dst; | |
71bcdba0 | 2200 | netevent.daddr = &msg->dest; |
60592833 | 2201 | netevent.neigh = neigh; |
8d71740c TT |
2202 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
2203 | ||
38308473 | 2204 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 2205 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 2206 | ip6_del_rt(rt); |
1da177e4 LT |
2207 | } |
2208 | ||
2209 | out: | |
e8599ff4 | 2210 | neigh_release(neigh); |
6e157b6a DM |
2211 | } |
2212 | ||
1da177e4 LT |
2213 | /* |
2214 | * Misc support functions | |
2215 | */ | |
2216 | ||
4b32b5ad MKL |
2217 | static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) |
2218 | { | |
2219 | BUG_ON(from->dst.from); | |
2220 | ||
2221 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
2222 | dst_hold(&from->dst); | |
2223 | rt->dst.from = &from->dst; | |
2224 | dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true); | |
2225 | } | |
2226 | ||
83a09abd MKL |
2227 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort) |
2228 | { | |
2229 | rt->dst.input = ort->dst.input; | |
2230 | rt->dst.output = ort->dst.output; | |
2231 | rt->rt6i_dst = ort->rt6i_dst; | |
2232 | rt->dst.error = ort->dst.error; | |
2233 | rt->rt6i_idev = ort->rt6i_idev; | |
2234 | if (rt->rt6i_idev) | |
2235 | in6_dev_hold(rt->rt6i_idev); | |
2236 | rt->dst.lastuse = jiffies; | |
2237 | rt->rt6i_gateway = ort->rt6i_gateway; | |
2238 | rt->rt6i_flags = ort->rt6i_flags; | |
2239 | rt6_set_from(rt, ort); | |
2240 | rt->rt6i_metric = ort->rt6i_metric; | |
1da177e4 | 2241 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd | 2242 | rt->rt6i_src = ort->rt6i_src; |
1da177e4 | 2243 | #endif |
83a09abd MKL |
2244 | rt->rt6i_prefsrc = ort->rt6i_prefsrc; |
2245 | rt->rt6i_table = ort->rt6i_table; | |
61adedf3 | 2246 | rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate); |
1da177e4 LT |
2247 | } |
2248 | ||
70ceb4f5 | 2249 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 2250 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
2251 | const struct in6_addr *prefix, int prefixlen, |
2252 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
2253 | { |
2254 | struct fib6_node *fn; | |
2255 | struct rt6_info *rt = NULL; | |
c71099ac TG |
2256 | struct fib6_table *table; |
2257 | ||
efa2cea0 | 2258 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 2259 | if (!table) |
c71099ac | 2260 | return NULL; |
70ceb4f5 | 2261 | |
5744dd9b | 2262 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2263 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0); |
70ceb4f5 YH |
2264 | if (!fn) |
2265 | goto out; | |
2266 | ||
d8d1f30b | 2267 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2268 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
2269 | continue; |
2270 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
2271 | continue; | |
2272 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
2273 | continue; | |
d8d1f30b | 2274 | dst_hold(&rt->dst); |
70ceb4f5 YH |
2275 | break; |
2276 | } | |
2277 | out: | |
5744dd9b | 2278 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
2279 | return rt; |
2280 | } | |
2281 | ||
efa2cea0 | 2282 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
2283 | const struct in6_addr *prefix, int prefixlen, |
2284 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 2285 | unsigned int pref) |
70ceb4f5 | 2286 | { |
86872cb5 | 2287 | struct fib6_config cfg = { |
238fc7ea | 2288 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2289 | .fc_ifindex = ifindex, |
2290 | .fc_dst_len = prefixlen, | |
2291 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
2292 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 2293 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
2294 | .fc_nlinfo.nlh = NULL, |
2295 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
2296 | }; |
2297 | ||
ca254490 | 2298 | cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO; |
4e3fd7a0 AD |
2299 | cfg.fc_dst = *prefix; |
2300 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 2301 | |
e317da96 YH |
2302 | /* We should treat it as a default route if prefix length is 0. */ |
2303 | if (!prefixlen) | |
86872cb5 | 2304 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 2305 | |
86872cb5 | 2306 | ip6_route_add(&cfg); |
70ceb4f5 | 2307 | |
efa2cea0 | 2308 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
2309 | } |
2310 | #endif | |
2311 | ||
b71d1d42 | 2312 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 2313 | { |
1da177e4 | 2314 | struct rt6_info *rt; |
c71099ac | 2315 | struct fib6_table *table; |
1da177e4 | 2316 | |
c346dca1 | 2317 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 2318 | if (!table) |
c71099ac | 2319 | return NULL; |
1da177e4 | 2320 | |
5744dd9b | 2321 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2322 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2323 | if (dev == rt->dst.dev && |
045927ff | 2324 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
2325 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
2326 | break; | |
2327 | } | |
2328 | if (rt) | |
d8d1f30b | 2329 | dst_hold(&rt->dst); |
5744dd9b | 2330 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2331 | return rt; |
2332 | } | |
2333 | ||
b71d1d42 | 2334 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
2335 | struct net_device *dev, |
2336 | unsigned int pref) | |
1da177e4 | 2337 | { |
86872cb5 | 2338 | struct fib6_config cfg = { |
ca254490 | 2339 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
238fc7ea | 2340 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2341 | .fc_ifindex = dev->ifindex, |
2342 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
2343 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 2344 | .fc_nlinfo.portid = 0, |
5578689a | 2345 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 2346 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 2347 | }; |
1da177e4 | 2348 | |
4e3fd7a0 | 2349 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 2350 | |
86872cb5 | 2351 | ip6_route_add(&cfg); |
1da177e4 | 2352 | |
1da177e4 LT |
2353 | return rt6_get_dflt_router(gwaddr, dev); |
2354 | } | |
2355 | ||
7b4da532 | 2356 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
2357 | { |
2358 | struct rt6_info *rt; | |
c71099ac TG |
2359 | struct fib6_table *table; |
2360 | ||
2361 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 2362 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 2363 | if (!table) |
c71099ac | 2364 | return; |
1da177e4 LT |
2365 | |
2366 | restart: | |
c71099ac | 2367 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 2368 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
3e8b0ac3 LC |
2369 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
2370 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d8d1f30b | 2371 | dst_hold(&rt->dst); |
c71099ac | 2372 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 2373 | ip6_del_rt(rt); |
1da177e4 LT |
2374 | goto restart; |
2375 | } | |
2376 | } | |
c71099ac | 2377 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2378 | } |
2379 | ||
5578689a DL |
2380 | static void rtmsg_to_fib6_config(struct net *net, |
2381 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
2382 | struct fib6_config *cfg) |
2383 | { | |
2384 | memset(cfg, 0, sizeof(*cfg)); | |
2385 | ||
ca254490 DA |
2386 | cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? |
2387 | : RT6_TABLE_MAIN; | |
86872cb5 TG |
2388 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; |
2389 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
2390 | cfg->fc_expires = rtmsg->rtmsg_info; | |
2391 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
2392 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
2393 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
2394 | ||
5578689a | 2395 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 2396 | |
4e3fd7a0 AD |
2397 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2398 | cfg->fc_src = rtmsg->rtmsg_src; | |
2399 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2400 | } |
2401 | ||
5578689a | 2402 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2403 | { |
86872cb5 | 2404 | struct fib6_config cfg; |
1da177e4 LT |
2405 | struct in6_rtmsg rtmsg; |
2406 | int err; | |
2407 | ||
67ba4152 | 2408 | switch (cmd) { |
1da177e4 LT |
2409 | case SIOCADDRT: /* Add a route */ |
2410 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 2411 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2412 | return -EPERM; |
2413 | err = copy_from_user(&rtmsg, arg, | |
2414 | sizeof(struct in6_rtmsg)); | |
2415 | if (err) | |
2416 | return -EFAULT; | |
86872cb5 | 2417 | |
5578689a | 2418 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2419 | |
1da177e4 LT |
2420 | rtnl_lock(); |
2421 | switch (cmd) { | |
2422 | case SIOCADDRT: | |
86872cb5 | 2423 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2424 | break; |
2425 | case SIOCDELRT: | |
86872cb5 | 2426 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2427 | break; |
2428 | default: | |
2429 | err = -EINVAL; | |
2430 | } | |
2431 | rtnl_unlock(); | |
2432 | ||
2433 | return err; | |
3ff50b79 | 2434 | } |
1da177e4 LT |
2435 | |
2436 | return -EINVAL; | |
2437 | } | |
2438 | ||
2439 | /* | |
2440 | * Drop the packet on the floor | |
2441 | */ | |
2442 | ||
d5fdd6ba | 2443 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2444 | { |
612f09e8 | 2445 | int type; |
adf30907 | 2446 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2447 | switch (ipstats_mib_noroutes) { |
2448 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2449 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2450 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2451 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2452 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2453 | break; |
2454 | } | |
2455 | /* FALLTHROUGH */ | |
2456 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2457 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2458 | ipstats_mib_noroutes); | |
612f09e8 YH |
2459 | break; |
2460 | } | |
3ffe533c | 2461 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2462 | kfree_skb(skb); |
2463 | return 0; | |
2464 | } | |
2465 | ||
9ce8ade0 TG |
2466 | static int ip6_pkt_discard(struct sk_buff *skb) |
2467 | { | |
612f09e8 | 2468 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2469 | } |
2470 | ||
ede2059d | 2471 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 2472 | { |
adf30907 | 2473 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2474 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2475 | } |
2476 | ||
9ce8ade0 TG |
2477 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2478 | { | |
612f09e8 | 2479 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2480 | } |
2481 | ||
ede2059d | 2482 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 2483 | { |
adf30907 | 2484 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2485 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2486 | } |
2487 | ||
1da177e4 LT |
2488 | /* |
2489 | * Allocate a dst for local (unicast / anycast) address. | |
2490 | */ | |
2491 | ||
2492 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2493 | const struct in6_addr *addr, | |
8f031519 | 2494 | bool anycast) |
1da177e4 | 2495 | { |
ca254490 | 2496 | u32 tb_id; |
c346dca1 | 2497 | struct net *net = dev_net(idev->dev); |
a3300ef4 | 2498 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, |
ad706862 | 2499 | DST_NOCOUNT); |
a3300ef4 | 2500 | if (!rt) |
1da177e4 LT |
2501 | return ERR_PTR(-ENOMEM); |
2502 | ||
1da177e4 LT |
2503 | in6_dev_hold(idev); |
2504 | ||
11d53b49 | 2505 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2506 | rt->dst.input = ip6_input; |
2507 | rt->dst.output = ip6_output; | |
1da177e4 | 2508 | rt->rt6i_idev = idev; |
1da177e4 LT |
2509 | |
2510 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2511 | if (anycast) |
2512 | rt->rt6i_flags |= RTF_ANYCAST; | |
2513 | else | |
1da177e4 | 2514 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2515 | |
550bab42 | 2516 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 2517 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2518 | rt->rt6i_dst.plen = 128; |
ca254490 DA |
2519 | tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL; |
2520 | rt->rt6i_table = fib6_get_table(net, tb_id); | |
8e3d5be7 | 2521 | rt->dst.flags |= DST_NOCACHE; |
1da177e4 | 2522 | |
d8d1f30b | 2523 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2524 | |
2525 | return rt; | |
2526 | } | |
2527 | ||
c3968a85 DW |
2528 | int ip6_route_get_saddr(struct net *net, |
2529 | struct rt6_info *rt, | |
b71d1d42 | 2530 | const struct in6_addr *daddr, |
c3968a85 DW |
2531 | unsigned int prefs, |
2532 | struct in6_addr *saddr) | |
2533 | { | |
e16e888b MS |
2534 | struct inet6_dev *idev = |
2535 | rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL; | |
c3968a85 | 2536 | int err = 0; |
e16e888b | 2537 | if (rt && rt->rt6i_prefsrc.plen) |
4e3fd7a0 | 2538 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2539 | else |
2540 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2541 | daddr, prefs, saddr); | |
2542 | return err; | |
2543 | } | |
2544 | ||
2545 | /* remove deleted ip from prefsrc entries */ | |
2546 | struct arg_dev_net_ip { | |
2547 | struct net_device *dev; | |
2548 | struct net *net; | |
2549 | struct in6_addr *addr; | |
2550 | }; | |
2551 | ||
2552 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2553 | { | |
2554 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2555 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2556 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2557 | ||
d1918542 | 2558 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2559 | rt != net->ipv6.ip6_null_entry && |
2560 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2561 | /* remove prefsrc entry */ | |
2562 | rt->rt6i_prefsrc.plen = 0; | |
2563 | } | |
2564 | return 0; | |
2565 | } | |
2566 | ||
2567 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2568 | { | |
2569 | struct net *net = dev_net(ifp->idev->dev); | |
2570 | struct arg_dev_net_ip adni = { | |
2571 | .dev = ifp->idev->dev, | |
2572 | .net = net, | |
2573 | .addr = &ifp->addr, | |
2574 | }; | |
0c3584d5 | 2575 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
2576 | } |
2577 | ||
be7a010d DJ |
2578 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) |
2579 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) | |
2580 | ||
2581 | /* Remove routers and update dst entries when gateway turn into host. */ | |
2582 | static int fib6_clean_tohost(struct rt6_info *rt, void *arg) | |
2583 | { | |
2584 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
2585 | ||
2586 | if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) || | |
2587 | ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) && | |
2588 | ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { | |
2589 | return -1; | |
2590 | } | |
2591 | return 0; | |
2592 | } | |
2593 | ||
2594 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
2595 | { | |
2596 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
2597 | } | |
2598 | ||
8ed67789 DL |
2599 | struct arg_dev_net { |
2600 | struct net_device *dev; | |
2601 | struct net *net; | |
2602 | }; | |
2603 | ||
1da177e4 LT |
2604 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2605 | { | |
bc3ef660 | 2606 | const struct arg_dev_net *adn = arg; |
2607 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2608 | |
d1918542 | 2609 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2610 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2611 | return -1; |
c159d30c | 2612 | |
1da177e4 LT |
2613 | return 0; |
2614 | } | |
2615 | ||
f3db4851 | 2616 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2617 | { |
8ed67789 DL |
2618 | struct arg_dev_net adn = { |
2619 | .dev = dev, | |
2620 | .net = net, | |
2621 | }; | |
2622 | ||
0c3584d5 | 2623 | fib6_clean_all(net, fib6_ifdown, &adn); |
1e493d19 | 2624 | icmp6_clean_all(fib6_ifdown, &adn); |
e332bc67 EB |
2625 | if (dev) |
2626 | rt6_uncached_list_flush_dev(net, dev); | |
1da177e4 LT |
2627 | } |
2628 | ||
95c96174 | 2629 | struct rt6_mtu_change_arg { |
1da177e4 | 2630 | struct net_device *dev; |
95c96174 | 2631 | unsigned int mtu; |
1da177e4 LT |
2632 | }; |
2633 | ||
2634 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2635 | { | |
2636 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2637 | struct inet6_dev *idev; | |
2638 | ||
2639 | /* In IPv6 pmtu discovery is not optional, | |
2640 | so that RTAX_MTU lock cannot disable it. | |
2641 | We still use this lock to block changes | |
2642 | caused by addrconf/ndisc. | |
2643 | */ | |
2644 | ||
2645 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2646 | if (!idev) |
1da177e4 LT |
2647 | return 0; |
2648 | ||
2649 | /* For administrative MTU increase, there is no way to discover | |
2650 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2651 | Since RFC 1981 doesn't include administrative MTU increase | |
2652 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2653 | */ | |
2654 | /* | |
2655 | If new MTU is less than route PMTU, this new MTU will be the | |
2656 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2657 | decreases; if new MTU is greater than route PMTU, and the | |
2658 | old MTU is the lowest MTU in the path, update the route PMTU | |
2659 | to reflect the increase. In this case if the other nodes' MTU | |
2660 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2661 | PMTU discouvery. | |
2662 | */ | |
d1918542 | 2663 | if (rt->dst.dev == arg->dev && |
4b32b5ad MKL |
2664 | !dst_metric_locked(&rt->dst, RTAX_MTU)) { |
2665 | if (rt->rt6i_flags & RTF_CACHE) { | |
2666 | /* For RTF_CACHE with rt6i_pmtu == 0 | |
2667 | * (i.e. a redirected route), | |
2668 | * the metrics of its rt->dst.from has already | |
2669 | * been updated. | |
2670 | */ | |
2671 | if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu) | |
2672 | rt->rt6i_pmtu = arg->mtu; | |
2673 | } else if (dst_mtu(&rt->dst) >= arg->mtu || | |
2674 | (dst_mtu(&rt->dst) < arg->mtu && | |
2675 | dst_mtu(&rt->dst) == idev->cnf.mtu6)) { | |
2676 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); | |
2677 | } | |
566cfd8f | 2678 | } |
1da177e4 LT |
2679 | return 0; |
2680 | } | |
2681 | ||
95c96174 | 2682 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2683 | { |
c71099ac TG |
2684 | struct rt6_mtu_change_arg arg = { |
2685 | .dev = dev, | |
2686 | .mtu = mtu, | |
2687 | }; | |
1da177e4 | 2688 | |
0c3584d5 | 2689 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
2690 | } |
2691 | ||
ef7c79ed | 2692 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2693 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2694 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2695 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2696 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2697 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2698 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 2699 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
2700 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
2701 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
86872cb5 TG |
2702 | }; |
2703 | ||
2704 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2705 | struct fib6_config *cfg) | |
1da177e4 | 2706 | { |
86872cb5 TG |
2707 | struct rtmsg *rtm; |
2708 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 2709 | unsigned int pref; |
86872cb5 | 2710 | int err; |
1da177e4 | 2711 | |
86872cb5 TG |
2712 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2713 | if (err < 0) | |
2714 | goto errout; | |
1da177e4 | 2715 | |
86872cb5 TG |
2716 | err = -EINVAL; |
2717 | rtm = nlmsg_data(nlh); | |
2718 | memset(cfg, 0, sizeof(*cfg)); | |
2719 | ||
2720 | cfg->fc_table = rtm->rtm_table; | |
2721 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2722 | cfg->fc_src_len = rtm->rtm_src_len; | |
2723 | cfg->fc_flags = RTF_UP; | |
2724 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2725 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2726 | |
ef2c7d7b ND |
2727 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2728 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2729 | rtm->rtm_type == RTN_PROHIBIT || |
2730 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2731 | cfg->fc_flags |= RTF_REJECT; |
2732 | ||
ab79ad14 MŻ |
2733 | if (rtm->rtm_type == RTN_LOCAL) |
2734 | cfg->fc_flags |= RTF_LOCAL; | |
2735 | ||
1f56a01f MKL |
2736 | if (rtm->rtm_flags & RTM_F_CLONED) |
2737 | cfg->fc_flags |= RTF_CACHE; | |
2738 | ||
15e47304 | 2739 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2740 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2741 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2742 | |
2743 | if (tb[RTA_GATEWAY]) { | |
67b61f6c | 2744 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 2745 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 2746 | } |
86872cb5 TG |
2747 | |
2748 | if (tb[RTA_DST]) { | |
2749 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2750 | ||
2751 | if (nla_len(tb[RTA_DST]) < plen) | |
2752 | goto errout; | |
2753 | ||
2754 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2755 | } |
86872cb5 TG |
2756 | |
2757 | if (tb[RTA_SRC]) { | |
2758 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2759 | ||
2760 | if (nla_len(tb[RTA_SRC]) < plen) | |
2761 | goto errout; | |
2762 | ||
2763 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2764 | } |
86872cb5 | 2765 | |
c3968a85 | 2766 | if (tb[RTA_PREFSRC]) |
67b61f6c | 2767 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 2768 | |
86872cb5 TG |
2769 | if (tb[RTA_OIF]) |
2770 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2771 | ||
2772 | if (tb[RTA_PRIORITY]) | |
2773 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2774 | ||
2775 | if (tb[RTA_METRICS]) { | |
2776 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2777 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2778 | } |
86872cb5 TG |
2779 | |
2780 | if (tb[RTA_TABLE]) | |
2781 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2782 | ||
51ebd318 ND |
2783 | if (tb[RTA_MULTIPATH]) { |
2784 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2785 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
2786 | } | |
2787 | ||
c78ba6d6 LR |
2788 | if (tb[RTA_PREF]) { |
2789 | pref = nla_get_u8(tb[RTA_PREF]); | |
2790 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
2791 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
2792 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
2793 | cfg->fc_flags |= RTF_PREF(pref); | |
2794 | } | |
2795 | ||
19e42e45 RP |
2796 | if (tb[RTA_ENCAP]) |
2797 | cfg->fc_encap = tb[RTA_ENCAP]; | |
2798 | ||
2799 | if (tb[RTA_ENCAP_TYPE]) | |
2800 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); | |
2801 | ||
86872cb5 TG |
2802 | err = 0; |
2803 | errout: | |
2804 | return err; | |
1da177e4 LT |
2805 | } |
2806 | ||
6b9ea5a6 RP |
2807 | struct rt6_nh { |
2808 | struct rt6_info *rt6_info; | |
2809 | struct fib6_config r_cfg; | |
2810 | struct mx6_config mxc; | |
2811 | struct list_head next; | |
2812 | }; | |
2813 | ||
2814 | static void ip6_print_replace_route_err(struct list_head *rt6_nh_list) | |
2815 | { | |
2816 | struct rt6_nh *nh; | |
2817 | ||
2818 | list_for_each_entry(nh, rt6_nh_list, next) { | |
2819 | pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n", | |
2820 | &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway, | |
2821 | nh->r_cfg.fc_ifindex); | |
2822 | } | |
2823 | } | |
2824 | ||
2825 | static int ip6_route_info_append(struct list_head *rt6_nh_list, | |
2826 | struct rt6_info *rt, struct fib6_config *r_cfg) | |
2827 | { | |
2828 | struct rt6_nh *nh; | |
2829 | struct rt6_info *rtnh; | |
2830 | int err = -EEXIST; | |
2831 | ||
2832 | list_for_each_entry(nh, rt6_nh_list, next) { | |
2833 | /* check if rt6_info already exists */ | |
2834 | rtnh = nh->rt6_info; | |
2835 | ||
2836 | if (rtnh->dst.dev == rt->dst.dev && | |
2837 | rtnh->rt6i_idev == rt->rt6i_idev && | |
2838 | ipv6_addr_equal(&rtnh->rt6i_gateway, | |
2839 | &rt->rt6i_gateway)) | |
2840 | return err; | |
2841 | } | |
2842 | ||
2843 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
2844 | if (!nh) | |
2845 | return -ENOMEM; | |
2846 | nh->rt6_info = rt; | |
2847 | err = ip6_convert_metrics(&nh->mxc, r_cfg); | |
2848 | if (err) { | |
2849 | kfree(nh); | |
2850 | return err; | |
2851 | } | |
2852 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); | |
2853 | list_add_tail(&nh->next, rt6_nh_list); | |
2854 | ||
2855 | return 0; | |
2856 | } | |
2857 | ||
2858 | static int ip6_route_multipath_add(struct fib6_config *cfg) | |
51ebd318 ND |
2859 | { |
2860 | struct fib6_config r_cfg; | |
2861 | struct rtnexthop *rtnh; | |
6b9ea5a6 RP |
2862 | struct rt6_info *rt; |
2863 | struct rt6_nh *err_nh; | |
2864 | struct rt6_nh *nh, *nh_safe; | |
51ebd318 ND |
2865 | int remaining; |
2866 | int attrlen; | |
6b9ea5a6 RP |
2867 | int err = 1; |
2868 | int nhn = 0; | |
2869 | int replace = (cfg->fc_nlinfo.nlh && | |
2870 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
2871 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 2872 | |
35f1b4e9 | 2873 | remaining = cfg->fc_mp_len; |
51ebd318 | 2874 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 2875 | |
6b9ea5a6 RP |
2876 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
2877 | * rt6_info structs per nexthop | |
2878 | */ | |
51ebd318 ND |
2879 | while (rtnh_ok(rtnh, remaining)) { |
2880 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2881 | if (rtnh->rtnh_ifindex) | |
2882 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2883 | ||
2884 | attrlen = rtnh_attrlen(rtnh); | |
2885 | if (attrlen > 0) { | |
2886 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2887 | ||
2888 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2889 | if (nla) { | |
67b61f6c | 2890 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
2891 | r_cfg.fc_flags |= RTF_GATEWAY; |
2892 | } | |
19e42e45 RP |
2893 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
2894 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
2895 | if (nla) | |
2896 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 2897 | } |
6b9ea5a6 | 2898 | |
8c5b83f0 RP |
2899 | rt = ip6_route_info_create(&r_cfg); |
2900 | if (IS_ERR(rt)) { | |
2901 | err = PTR_ERR(rt); | |
2902 | rt = NULL; | |
6b9ea5a6 | 2903 | goto cleanup; |
8c5b83f0 | 2904 | } |
6b9ea5a6 RP |
2905 | |
2906 | err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg); | |
51ebd318 | 2907 | if (err) { |
6b9ea5a6 RP |
2908 | dst_free(&rt->dst); |
2909 | goto cleanup; | |
2910 | } | |
2911 | ||
2912 | rtnh = rtnh_next(rtnh, &remaining); | |
2913 | } | |
2914 | ||
2915 | err_nh = NULL; | |
2916 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
2917 | err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc); | |
2918 | /* nh->rt6_info is used or freed at this point, reset to NULL*/ | |
2919 | nh->rt6_info = NULL; | |
2920 | if (err) { | |
2921 | if (replace && nhn) | |
2922 | ip6_print_replace_route_err(&rt6_nh_list); | |
2923 | err_nh = nh; | |
2924 | goto add_errout; | |
51ebd318 | 2925 | } |
6b9ea5a6 | 2926 | |
1a72418b | 2927 | /* Because each route is added like a single route we remove |
27596472 MK |
2928 | * these flags after the first nexthop: if there is a collision, |
2929 | * we have already failed to add the first nexthop: | |
2930 | * fib6_add_rt2node() has rejected it; when replacing, old | |
2931 | * nexthops have been replaced by first new, the rest should | |
2932 | * be added to it. | |
1a72418b | 2933 | */ |
27596472 MK |
2934 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
2935 | NLM_F_REPLACE); | |
6b9ea5a6 RP |
2936 | nhn++; |
2937 | } | |
2938 | ||
2939 | goto cleanup; | |
2940 | ||
2941 | add_errout: | |
2942 | /* Delete routes that were already added */ | |
2943 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
2944 | if (err_nh == nh) | |
2945 | break; | |
2946 | ip6_route_del(&nh->r_cfg); | |
2947 | } | |
2948 | ||
2949 | cleanup: | |
2950 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
2951 | if (nh->rt6_info) | |
2952 | dst_free(&nh->rt6_info->dst); | |
52fe51f8 | 2953 | kfree(nh->mxc.mx); |
6b9ea5a6 RP |
2954 | list_del(&nh->next); |
2955 | kfree(nh); | |
2956 | } | |
2957 | ||
2958 | return err; | |
2959 | } | |
2960 | ||
2961 | static int ip6_route_multipath_del(struct fib6_config *cfg) | |
2962 | { | |
2963 | struct fib6_config r_cfg; | |
2964 | struct rtnexthop *rtnh; | |
2965 | int remaining; | |
2966 | int attrlen; | |
2967 | int err = 1, last_err = 0; | |
2968 | ||
2969 | remaining = cfg->fc_mp_len; | |
2970 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
2971 | ||
2972 | /* Parse a Multipath Entry */ | |
2973 | while (rtnh_ok(rtnh, remaining)) { | |
2974 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2975 | if (rtnh->rtnh_ifindex) | |
2976 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2977 | ||
2978 | attrlen = rtnh_attrlen(rtnh); | |
2979 | if (attrlen > 0) { | |
2980 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2981 | ||
2982 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2983 | if (nla) { | |
2984 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
2985 | r_cfg.fc_flags |= RTF_GATEWAY; | |
2986 | } | |
2987 | } | |
2988 | err = ip6_route_del(&r_cfg); | |
2989 | if (err) | |
2990 | last_err = err; | |
2991 | ||
51ebd318 ND |
2992 | rtnh = rtnh_next(rtnh, &remaining); |
2993 | } | |
2994 | ||
2995 | return last_err; | |
2996 | } | |
2997 | ||
67ba4152 | 2998 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 2999 | { |
86872cb5 TG |
3000 | struct fib6_config cfg; |
3001 | int err; | |
1da177e4 | 3002 | |
86872cb5 TG |
3003 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
3004 | if (err < 0) | |
3005 | return err; | |
3006 | ||
51ebd318 | 3007 | if (cfg.fc_mp) |
6b9ea5a6 | 3008 | return ip6_route_multipath_del(&cfg); |
51ebd318 ND |
3009 | else |
3010 | return ip6_route_del(&cfg); | |
1da177e4 LT |
3011 | } |
3012 | ||
67ba4152 | 3013 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 3014 | { |
86872cb5 TG |
3015 | struct fib6_config cfg; |
3016 | int err; | |
1da177e4 | 3017 | |
86872cb5 TG |
3018 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
3019 | if (err < 0) | |
3020 | return err; | |
3021 | ||
51ebd318 | 3022 | if (cfg.fc_mp) |
6b9ea5a6 | 3023 | return ip6_route_multipath_add(&cfg); |
51ebd318 ND |
3024 | else |
3025 | return ip6_route_add(&cfg); | |
1da177e4 LT |
3026 | } |
3027 | ||
19e42e45 | 3028 | static inline size_t rt6_nlmsg_size(struct rt6_info *rt) |
339bf98f TG |
3029 | { |
3030 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
3031 | + nla_total_size(16) /* RTA_SRC */ | |
3032 | + nla_total_size(16) /* RTA_DST */ | |
3033 | + nla_total_size(16) /* RTA_GATEWAY */ | |
3034 | + nla_total_size(16) /* RTA_PREFSRC */ | |
3035 | + nla_total_size(4) /* RTA_TABLE */ | |
3036 | + nla_total_size(4) /* RTA_IIF */ | |
3037 | + nla_total_size(4) /* RTA_OIF */ | |
3038 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 3039 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 3040 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 3041 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 3042 | + nla_total_size(1) /* RTA_PREF */ |
61adedf3 | 3043 | + lwtunnel_get_encap_size(rt->dst.lwtstate); |
339bf98f TG |
3044 | } |
3045 | ||
191cd582 BH |
3046 | static int rt6_fill_node(struct net *net, |
3047 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 3048 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 3049 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 3050 | int prefix, int nowait, unsigned int flags) |
1da177e4 | 3051 | { |
4b32b5ad | 3052 | u32 metrics[RTAX_MAX]; |
1da177e4 | 3053 | struct rtmsg *rtm; |
2d7202bf | 3054 | struct nlmsghdr *nlh; |
e3703b3d | 3055 | long expires; |
9e762a4a | 3056 | u32 table; |
1da177e4 LT |
3057 | |
3058 | if (prefix) { /* user wants prefix routes only */ | |
3059 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
3060 | /* success since this is not a prefix route */ | |
3061 | return 1; | |
3062 | } | |
3063 | } | |
3064 | ||
15e47304 | 3065 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 3066 | if (!nlh) |
26932566 | 3067 | return -EMSGSIZE; |
2d7202bf TG |
3068 | |
3069 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
3070 | rtm->rtm_family = AF_INET6; |
3071 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
3072 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
3073 | rtm->rtm_tos = 0; | |
c71099ac | 3074 | if (rt->rt6i_table) |
9e762a4a | 3075 | table = rt->rt6i_table->tb6_id; |
c71099ac | 3076 | else |
9e762a4a PM |
3077 | table = RT6_TABLE_UNSPEC; |
3078 | rtm->rtm_table = table; | |
c78679e8 DM |
3079 | if (nla_put_u32(skb, RTA_TABLE, table)) |
3080 | goto nla_put_failure; | |
ef2c7d7b ND |
3081 | if (rt->rt6i_flags & RTF_REJECT) { |
3082 | switch (rt->dst.error) { | |
3083 | case -EINVAL: | |
3084 | rtm->rtm_type = RTN_BLACKHOLE; | |
3085 | break; | |
3086 | case -EACCES: | |
3087 | rtm->rtm_type = RTN_PROHIBIT; | |
3088 | break; | |
b4949ab2 ND |
3089 | case -EAGAIN: |
3090 | rtm->rtm_type = RTN_THROW; | |
3091 | break; | |
ef2c7d7b ND |
3092 | default: |
3093 | rtm->rtm_type = RTN_UNREACHABLE; | |
3094 | break; | |
3095 | } | |
3096 | } | |
38308473 | 3097 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 3098 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 3099 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
3100 | rtm->rtm_type = RTN_LOCAL; |
3101 | else | |
3102 | rtm->rtm_type = RTN_UNICAST; | |
3103 | rtm->rtm_flags = 0; | |
35103d11 | 3104 | if (!netif_carrier_ok(rt->dst.dev)) { |
cea45e20 | 3105 | rtm->rtm_flags |= RTNH_F_LINKDOWN; |
35103d11 AG |
3106 | if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown) |
3107 | rtm->rtm_flags |= RTNH_F_DEAD; | |
3108 | } | |
1da177e4 LT |
3109 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
3110 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 3111 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 3112 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
3113 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
3114 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
3115 | rtm->rtm_protocol = RTPROT_RA; | |
3116 | else | |
3117 | rtm->rtm_protocol = RTPROT_KERNEL; | |
3118 | } | |
1da177e4 | 3119 | |
38308473 | 3120 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
3121 | rtm->rtm_flags |= RTM_F_CLONED; |
3122 | ||
3123 | if (dst) { | |
930345ea | 3124 | if (nla_put_in6_addr(skb, RTA_DST, dst)) |
c78679e8 | 3125 | goto nla_put_failure; |
1ab1457c | 3126 | rtm->rtm_dst_len = 128; |
1da177e4 | 3127 | } else if (rtm->rtm_dst_len) |
930345ea | 3128 | if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr)) |
c78679e8 | 3129 | goto nla_put_failure; |
1da177e4 LT |
3130 | #ifdef CONFIG_IPV6_SUBTREES |
3131 | if (src) { | |
930345ea | 3132 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 3133 | goto nla_put_failure; |
1ab1457c | 3134 | rtm->rtm_src_len = 128; |
c78679e8 | 3135 | } else if (rtm->rtm_src_len && |
930345ea | 3136 | nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr)) |
c78679e8 | 3137 | goto nla_put_failure; |
1da177e4 | 3138 | #endif |
7bc570c8 YH |
3139 | if (iif) { |
3140 | #ifdef CONFIG_IPV6_MROUTE | |
3141 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 3142 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
3143 | if (err <= 0) { |
3144 | if (!nowait) { | |
3145 | if (err == 0) | |
3146 | return 0; | |
3147 | goto nla_put_failure; | |
3148 | } else { | |
3149 | if (err == -EMSGSIZE) | |
3150 | goto nla_put_failure; | |
3151 | } | |
3152 | } | |
3153 | } else | |
3154 | #endif | |
c78679e8 DM |
3155 | if (nla_put_u32(skb, RTA_IIF, iif)) |
3156 | goto nla_put_failure; | |
7bc570c8 | 3157 | } else if (dst) { |
1da177e4 | 3158 | struct in6_addr saddr_buf; |
c78679e8 | 3159 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
930345ea | 3160 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3161 | goto nla_put_failure; |
1da177e4 | 3162 | } |
2d7202bf | 3163 | |
c3968a85 DW |
3164 | if (rt->rt6i_prefsrc.plen) { |
3165 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 3166 | saddr_buf = rt->rt6i_prefsrc.addr; |
930345ea | 3167 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3168 | goto nla_put_failure; |
c3968a85 DW |
3169 | } |
3170 | ||
4b32b5ad MKL |
3171 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
3172 | if (rt->rt6i_pmtu) | |
3173 | metrics[RTAX_MTU - 1] = rt->rt6i_pmtu; | |
3174 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
2d7202bf TG |
3175 | goto nla_put_failure; |
3176 | ||
dd0cbf29 | 3177 | if (rt->rt6i_flags & RTF_GATEWAY) { |
930345ea | 3178 | if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0) |
94f826b8 | 3179 | goto nla_put_failure; |
94f826b8 | 3180 | } |
2d7202bf | 3181 | |
c78679e8 DM |
3182 | if (rt->dst.dev && |
3183 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
3184 | goto nla_put_failure; | |
3185 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
3186 | goto nla_put_failure; | |
8253947e LW |
3187 | |
3188 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 3189 | |
87a50699 | 3190 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 3191 | goto nla_put_failure; |
2d7202bf | 3192 | |
c78ba6d6 LR |
3193 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags))) |
3194 | goto nla_put_failure; | |
3195 | ||
61adedf3 | 3196 | lwtunnel_fill_encap(skb, rt->dst.lwtstate); |
19e42e45 | 3197 | |
053c095a JB |
3198 | nlmsg_end(skb, nlh); |
3199 | return 0; | |
2d7202bf TG |
3200 | |
3201 | nla_put_failure: | |
26932566 PM |
3202 | nlmsg_cancel(skb, nlh); |
3203 | return -EMSGSIZE; | |
1da177e4 LT |
3204 | } |
3205 | ||
1b43af54 | 3206 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
3207 | { |
3208 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
3209 | int prefix; | |
3210 | ||
2d7202bf TG |
3211 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
3212 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
3213 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
3214 | } else | |
3215 | prefix = 0; | |
3216 | ||
191cd582 BH |
3217 | return rt6_fill_node(arg->net, |
3218 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 3219 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 3220 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
3221 | } |
3222 | ||
67ba4152 | 3223 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) |
1da177e4 | 3224 | { |
3b1e0a65 | 3225 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
3226 | struct nlattr *tb[RTA_MAX+1]; |
3227 | struct rt6_info *rt; | |
1da177e4 | 3228 | struct sk_buff *skb; |
ab364a6f | 3229 | struct rtmsg *rtm; |
4c9483b2 | 3230 | struct flowi6 fl6; |
72331bc0 | 3231 | int err, iif = 0, oif = 0; |
1da177e4 | 3232 | |
ab364a6f TG |
3233 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
3234 | if (err < 0) | |
3235 | goto errout; | |
1da177e4 | 3236 | |
ab364a6f | 3237 | err = -EINVAL; |
4c9483b2 | 3238 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 3239 | |
ab364a6f TG |
3240 | if (tb[RTA_SRC]) { |
3241 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
3242 | goto errout; | |
3243 | ||
4e3fd7a0 | 3244 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
3245 | } |
3246 | ||
3247 | if (tb[RTA_DST]) { | |
3248 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
3249 | goto errout; | |
3250 | ||
4e3fd7a0 | 3251 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
3252 | } |
3253 | ||
3254 | if (tb[RTA_IIF]) | |
3255 | iif = nla_get_u32(tb[RTA_IIF]); | |
3256 | ||
3257 | if (tb[RTA_OIF]) | |
72331bc0 | 3258 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 3259 | |
2e47b291 LC |
3260 | if (tb[RTA_MARK]) |
3261 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
3262 | ||
1da177e4 LT |
3263 | if (iif) { |
3264 | struct net_device *dev; | |
72331bc0 SL |
3265 | int flags = 0; |
3266 | ||
5578689a | 3267 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
3268 | if (!dev) { |
3269 | err = -ENODEV; | |
ab364a6f | 3270 | goto errout; |
1da177e4 | 3271 | } |
72331bc0 SL |
3272 | |
3273 | fl6.flowi6_iif = iif; | |
3274 | ||
3275 | if (!ipv6_addr_any(&fl6.saddr)) | |
3276 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3277 | ||
3278 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
3279 | flags); | |
3280 | } else { | |
3281 | fl6.flowi6_oif = oif; | |
3282 | ||
ca254490 DA |
3283 | if (netif_index_is_l3_master(net, oif)) { |
3284 | fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC | | |
3285 | FLOWI_FLAG_SKIP_NH_OIF; | |
3286 | } | |
3287 | ||
72331bc0 | 3288 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); |
1da177e4 LT |
3289 | } |
3290 | ||
ab364a6f | 3291 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 3292 | if (!skb) { |
94e187c0 | 3293 | ip6_rt_put(rt); |
ab364a6f TG |
3294 | err = -ENOBUFS; |
3295 | goto errout; | |
3296 | } | |
1da177e4 | 3297 | |
ab364a6f TG |
3298 | /* Reserve room for dummy headers, this skb can pass |
3299 | through good chunk of routing engine. | |
3300 | */ | |
459a98ed | 3301 | skb_reset_mac_header(skb); |
ab364a6f | 3302 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 3303 | |
d8d1f30b | 3304 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 3305 | |
4c9483b2 | 3306 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 3307 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 3308 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 3309 | if (err < 0) { |
ab364a6f TG |
3310 | kfree_skb(skb); |
3311 | goto errout; | |
1da177e4 LT |
3312 | } |
3313 | ||
15e47304 | 3314 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 3315 | errout: |
1da177e4 | 3316 | return err; |
1da177e4 LT |
3317 | } |
3318 | ||
37a1d361 RP |
3319 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info, |
3320 | unsigned int nlm_flags) | |
1da177e4 LT |
3321 | { |
3322 | struct sk_buff *skb; | |
5578689a | 3323 | struct net *net = info->nl_net; |
528c4ceb DL |
3324 | u32 seq; |
3325 | int err; | |
3326 | ||
3327 | err = -ENOBUFS; | |
38308473 | 3328 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 3329 | |
19e42e45 | 3330 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 3331 | if (!skb) |
21713ebc TG |
3332 | goto errout; |
3333 | ||
191cd582 | 3334 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
37a1d361 | 3335 | event, info->portid, seq, 0, 0, nlm_flags); |
26932566 PM |
3336 | if (err < 0) { |
3337 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
3338 | WARN_ON(err == -EMSGSIZE); | |
3339 | kfree_skb(skb); | |
3340 | goto errout; | |
3341 | } | |
15e47304 | 3342 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
3343 | info->nlh, gfp_any()); |
3344 | return; | |
21713ebc TG |
3345 | errout: |
3346 | if (err < 0) | |
5578689a | 3347 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
3348 | } |
3349 | ||
8ed67789 | 3350 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 3351 | unsigned long event, void *ptr) |
8ed67789 | 3352 | { |
351638e7 | 3353 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3354 | struct net *net = dev_net(dev); |
8ed67789 DL |
3355 | |
3356 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 3357 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
3358 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
3359 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3360 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 3361 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 3362 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
3363 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
3364 | #endif | |
3365 | } | |
3366 | ||
3367 | return NOTIFY_OK; | |
3368 | } | |
3369 | ||
1da177e4 LT |
3370 | /* |
3371 | * /proc | |
3372 | */ | |
3373 | ||
3374 | #ifdef CONFIG_PROC_FS | |
3375 | ||
33120b30 AD |
3376 | static const struct file_operations ipv6_route_proc_fops = { |
3377 | .owner = THIS_MODULE, | |
3378 | .open = ipv6_route_open, | |
3379 | .read = seq_read, | |
3380 | .llseek = seq_lseek, | |
8d2ca1d7 | 3381 | .release = seq_release_net, |
33120b30 AD |
3382 | }; |
3383 | ||
1da177e4 LT |
3384 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
3385 | { | |
69ddb805 | 3386 | struct net *net = (struct net *)seq->private; |
1da177e4 | 3387 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
3388 | net->ipv6.rt6_stats->fib_nodes, |
3389 | net->ipv6.rt6_stats->fib_route_nodes, | |
3390 | net->ipv6.rt6_stats->fib_rt_alloc, | |
3391 | net->ipv6.rt6_stats->fib_rt_entries, | |
3392 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 3393 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 3394 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
3395 | |
3396 | return 0; | |
3397 | } | |
3398 | ||
3399 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
3400 | { | |
de05c557 | 3401 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
3402 | } |
3403 | ||
9a32144e | 3404 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
3405 | .owner = THIS_MODULE, |
3406 | .open = rt6_stats_seq_open, | |
3407 | .read = seq_read, | |
3408 | .llseek = seq_lseek, | |
b6fcbdb4 | 3409 | .release = single_release_net, |
1da177e4 LT |
3410 | }; |
3411 | #endif /* CONFIG_PROC_FS */ | |
3412 | ||
3413 | #ifdef CONFIG_SYSCTL | |
3414 | ||
1da177e4 | 3415 | static |
fe2c6338 | 3416 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
3417 | void __user *buffer, size_t *lenp, loff_t *ppos) |
3418 | { | |
c486da34 LAG |
3419 | struct net *net; |
3420 | int delay; | |
3421 | if (!write) | |
1da177e4 | 3422 | return -EINVAL; |
c486da34 LAG |
3423 | |
3424 | net = (struct net *)ctl->extra1; | |
3425 | delay = net->ipv6.sysctl.flush_delay; | |
3426 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 3427 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 3428 | return 0; |
1da177e4 LT |
3429 | } |
3430 | ||
fe2c6338 | 3431 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 3432 | { |
1da177e4 | 3433 | .procname = "flush", |
4990509f | 3434 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 3435 | .maxlen = sizeof(int), |
89c8b3a1 | 3436 | .mode = 0200, |
6d9f239a | 3437 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
3438 | }, |
3439 | { | |
1da177e4 | 3440 | .procname = "gc_thresh", |
9a7ec3a9 | 3441 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
3442 | .maxlen = sizeof(int), |
3443 | .mode = 0644, | |
6d9f239a | 3444 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3445 | }, |
3446 | { | |
1da177e4 | 3447 | .procname = "max_size", |
4990509f | 3448 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
3449 | .maxlen = sizeof(int), |
3450 | .mode = 0644, | |
6d9f239a | 3451 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3452 | }, |
3453 | { | |
1da177e4 | 3454 | .procname = "gc_min_interval", |
4990509f | 3455 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3456 | .maxlen = sizeof(int), |
3457 | .mode = 0644, | |
6d9f239a | 3458 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3459 | }, |
3460 | { | |
1da177e4 | 3461 | .procname = "gc_timeout", |
4990509f | 3462 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
3463 | .maxlen = sizeof(int), |
3464 | .mode = 0644, | |
6d9f239a | 3465 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3466 | }, |
3467 | { | |
1da177e4 | 3468 | .procname = "gc_interval", |
4990509f | 3469 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
3470 | .maxlen = sizeof(int), |
3471 | .mode = 0644, | |
6d9f239a | 3472 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3473 | }, |
3474 | { | |
1da177e4 | 3475 | .procname = "gc_elasticity", |
4990509f | 3476 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
3477 | .maxlen = sizeof(int), |
3478 | .mode = 0644, | |
f3d3f616 | 3479 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3480 | }, |
3481 | { | |
1da177e4 | 3482 | .procname = "mtu_expires", |
4990509f | 3483 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
3484 | .maxlen = sizeof(int), |
3485 | .mode = 0644, | |
6d9f239a | 3486 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3487 | }, |
3488 | { | |
1da177e4 | 3489 | .procname = "min_adv_mss", |
4990509f | 3490 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
3491 | .maxlen = sizeof(int), |
3492 | .mode = 0644, | |
f3d3f616 | 3493 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3494 | }, |
3495 | { | |
1da177e4 | 3496 | .procname = "gc_min_interval_ms", |
4990509f | 3497 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3498 | .maxlen = sizeof(int), |
3499 | .mode = 0644, | |
6d9f239a | 3500 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 3501 | }, |
f8572d8f | 3502 | { } |
1da177e4 LT |
3503 | }; |
3504 | ||
2c8c1e72 | 3505 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
3506 | { |
3507 | struct ctl_table *table; | |
3508 | ||
3509 | table = kmemdup(ipv6_route_table_template, | |
3510 | sizeof(ipv6_route_table_template), | |
3511 | GFP_KERNEL); | |
5ee09105 YH |
3512 | |
3513 | if (table) { | |
3514 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 3515 | table[0].extra1 = net; |
86393e52 | 3516 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
3517 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
3518 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
3519 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3520 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
3521 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3522 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
3523 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 3524 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
3525 | |
3526 | /* Don't export sysctls to unprivileged users */ | |
3527 | if (net->user_ns != &init_user_ns) | |
3528 | table[0].procname = NULL; | |
5ee09105 YH |
3529 | } |
3530 | ||
760f2d01 DL |
3531 | return table; |
3532 | } | |
1da177e4 LT |
3533 | #endif |
3534 | ||
2c8c1e72 | 3535 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 3536 | { |
633d424b | 3537 | int ret = -ENOMEM; |
8ed67789 | 3538 | |
86393e52 AD |
3539 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
3540 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 3541 | |
fc66f95c ED |
3542 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
3543 | goto out_ip6_dst_ops; | |
3544 | ||
8ed67789 DL |
3545 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
3546 | sizeof(*net->ipv6.ip6_null_entry), | |
3547 | GFP_KERNEL); | |
3548 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 3549 | goto out_ip6_dst_entries; |
d8d1f30b | 3550 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 3551 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 3552 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3553 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
3554 | ip6_template_metrics, true); | |
8ed67789 DL |
3555 | |
3556 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3557 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
3558 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
3559 | GFP_KERNEL); | |
68fffc67 PZ |
3560 | if (!net->ipv6.ip6_prohibit_entry) |
3561 | goto out_ip6_null_entry; | |
d8d1f30b | 3562 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 3563 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 3564 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3565 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
3566 | ip6_template_metrics, true); | |
8ed67789 DL |
3567 | |
3568 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
3569 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
3570 | GFP_KERNEL); | |
68fffc67 PZ |
3571 | if (!net->ipv6.ip6_blk_hole_entry) |
3572 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 3573 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 3574 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 3575 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3576 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
3577 | ip6_template_metrics, true); | |
8ed67789 DL |
3578 | #endif |
3579 | ||
b339a47c PZ |
3580 | net->ipv6.sysctl.flush_delay = 0; |
3581 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3582 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3583 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3584 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3585 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
3586 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
3587 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
3588 | ||
6891a346 BT |
3589 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
3590 | ||
8ed67789 DL |
3591 | ret = 0; |
3592 | out: | |
3593 | return ret; | |
f2fc6a54 | 3594 | |
68fffc67 PZ |
3595 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
3596 | out_ip6_prohibit_entry: | |
3597 | kfree(net->ipv6.ip6_prohibit_entry); | |
3598 | out_ip6_null_entry: | |
3599 | kfree(net->ipv6.ip6_null_entry); | |
3600 | #endif | |
fc66f95c ED |
3601 | out_ip6_dst_entries: |
3602 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3603 | out_ip6_dst_ops: |
f2fc6a54 | 3604 | goto out; |
cdb18761 DL |
3605 | } |
3606 | ||
2c8c1e72 | 3607 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3608 | { |
8ed67789 DL |
3609 | kfree(net->ipv6.ip6_null_entry); |
3610 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3611 | kfree(net->ipv6.ip6_prohibit_entry); | |
3612 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3613 | #endif | |
41bb78b4 | 3614 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3615 | } |
3616 | ||
d189634e TG |
3617 | static int __net_init ip6_route_net_init_late(struct net *net) |
3618 | { | |
3619 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
3620 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
3621 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3622 | #endif |
3623 | return 0; | |
3624 | } | |
3625 | ||
3626 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3627 | { | |
3628 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3629 | remove_proc_entry("ipv6_route", net->proc_net); |
3630 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3631 | #endif |
3632 | } | |
3633 | ||
cdb18761 DL |
3634 | static struct pernet_operations ip6_route_net_ops = { |
3635 | .init = ip6_route_net_init, | |
3636 | .exit = ip6_route_net_exit, | |
3637 | }; | |
3638 | ||
c3426b47 DM |
3639 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3640 | { | |
3641 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3642 | ||
3643 | if (!bp) | |
3644 | return -ENOMEM; | |
3645 | inet_peer_base_init(bp); | |
3646 | net->ipv6.peers = bp; | |
3647 | return 0; | |
3648 | } | |
3649 | ||
3650 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3651 | { | |
3652 | struct inet_peer_base *bp = net->ipv6.peers; | |
3653 | ||
3654 | net->ipv6.peers = NULL; | |
56a6b248 | 3655 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3656 | kfree(bp); |
3657 | } | |
3658 | ||
2b823f72 | 3659 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3660 | .init = ipv6_inetpeer_init, |
3661 | .exit = ipv6_inetpeer_exit, | |
3662 | }; | |
3663 | ||
d189634e TG |
3664 | static struct pernet_operations ip6_route_net_late_ops = { |
3665 | .init = ip6_route_net_init_late, | |
3666 | .exit = ip6_route_net_exit_late, | |
3667 | }; | |
3668 | ||
8ed67789 DL |
3669 | static struct notifier_block ip6_route_dev_notifier = { |
3670 | .notifier_call = ip6_route_dev_notify, | |
3671 | .priority = 0, | |
3672 | }; | |
3673 | ||
433d49c3 | 3674 | int __init ip6_route_init(void) |
1da177e4 | 3675 | { |
433d49c3 | 3676 | int ret; |
8d0b94af | 3677 | int cpu; |
433d49c3 | 3678 | |
9a7ec3a9 DL |
3679 | ret = -ENOMEM; |
3680 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3681 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3682 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3683 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3684 | goto out; |
14e50e57 | 3685 | |
fc66f95c | 3686 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3687 | if (ret) |
bdb3289f | 3688 | goto out_kmem_cache; |
bdb3289f | 3689 | |
c3426b47 DM |
3690 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3691 | if (ret) | |
e8803b6c | 3692 | goto out_dst_entries; |
2a0c451a | 3693 | |
7e52b33b DM |
3694 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3695 | if (ret) | |
3696 | goto out_register_inetpeer; | |
c3426b47 | 3697 | |
5dc121e9 AE |
3698 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3699 | ||
8ed67789 DL |
3700 | /* Registering of the loopback is done before this portion of code, |
3701 | * the loopback reference in rt6_info will not be taken, do it | |
3702 | * manually for init_net */ | |
d8d1f30b | 3703 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3704 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3705 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3706 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3707 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3708 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3709 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3710 | #endif | |
e8803b6c | 3711 | ret = fib6_init(); |
433d49c3 | 3712 | if (ret) |
8ed67789 | 3713 | goto out_register_subsys; |
433d49c3 | 3714 | |
433d49c3 DL |
3715 | ret = xfrm6_init(); |
3716 | if (ret) | |
e8803b6c | 3717 | goto out_fib6_init; |
c35b7e72 | 3718 | |
433d49c3 DL |
3719 | ret = fib6_rules_init(); |
3720 | if (ret) | |
3721 | goto xfrm6_init; | |
7e5449c2 | 3722 | |
d189634e TG |
3723 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3724 | if (ret) | |
3725 | goto fib6_rules_init; | |
3726 | ||
433d49c3 | 3727 | ret = -ENOBUFS; |
c7ac8679 GR |
3728 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3729 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3730 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3731 | goto out_register_late_subsys; |
c127ea2c | 3732 | |
8ed67789 | 3733 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3734 | if (ret) |
d189634e | 3735 | goto out_register_late_subsys; |
8ed67789 | 3736 | |
8d0b94af MKL |
3737 | for_each_possible_cpu(cpu) { |
3738 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
3739 | ||
3740 | INIT_LIST_HEAD(&ul->head); | |
3741 | spin_lock_init(&ul->lock); | |
3742 | } | |
3743 | ||
433d49c3 DL |
3744 | out: |
3745 | return ret; | |
3746 | ||
d189634e TG |
3747 | out_register_late_subsys: |
3748 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3749 | fib6_rules_init: |
433d49c3 DL |
3750 | fib6_rules_cleanup(); |
3751 | xfrm6_init: | |
433d49c3 | 3752 | xfrm6_fini(); |
2a0c451a TG |
3753 | out_fib6_init: |
3754 | fib6_gc_cleanup(); | |
8ed67789 DL |
3755 | out_register_subsys: |
3756 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3757 | out_register_inetpeer: |
3758 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3759 | out_dst_entries: |
3760 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3761 | out_kmem_cache: |
f2fc6a54 | 3762 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3763 | goto out; |
1da177e4 LT |
3764 | } |
3765 | ||
3766 | void ip6_route_cleanup(void) | |
3767 | { | |
8ed67789 | 3768 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3769 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3770 | fib6_rules_cleanup(); |
1da177e4 | 3771 | xfrm6_fini(); |
1da177e4 | 3772 | fib6_gc_cleanup(); |
c3426b47 | 3773 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3774 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3775 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3776 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3777 | } |