Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
f3213831 JP |
27 | #define pr_fmt(fmt) "IPv6: " fmt |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 | 30 | #include <linux/errno.h> |
bc3b2d7f | 31 | #include <linux/export.h> |
1da177e4 LT |
32 | #include <linux/types.h> |
33 | #include <linux/times.h> | |
34 | #include <linux/socket.h> | |
35 | #include <linux/sockios.h> | |
36 | #include <linux/net.h> | |
37 | #include <linux/route.h> | |
38 | #include <linux/netdevice.h> | |
39 | #include <linux/in6.h> | |
7bc570c8 | 40 | #include <linux/mroute6.h> |
1da177e4 | 41 | #include <linux/init.h> |
1da177e4 | 42 | #include <linux/if_arp.h> |
1da177e4 LT |
43 | #include <linux/proc_fs.h> |
44 | #include <linux/seq_file.h> | |
5b7c931d | 45 | #include <linux/nsproxy.h> |
5a0e3ad6 | 46 | #include <linux/slab.h> |
457c4cbc | 47 | #include <net/net_namespace.h> |
1da177e4 LT |
48 | #include <net/snmp.h> |
49 | #include <net/ipv6.h> | |
50 | #include <net/ip6_fib.h> | |
51 | #include <net/ip6_route.h> | |
52 | #include <net/ndisc.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/tcp.h> | |
55 | #include <linux/rtnetlink.h> | |
56 | #include <net/dst.h> | |
904af04d | 57 | #include <net/dst_metadata.h> |
1da177e4 | 58 | #include <net/xfrm.h> |
8d71740c | 59 | #include <net/netevent.h> |
21713ebc | 60 | #include <net/netlink.h> |
51ebd318 | 61 | #include <net/nexthop.h> |
19e42e45 | 62 | #include <net/lwtunnel.h> |
904af04d | 63 | #include <net/ip_tunnels.h> |
1da177e4 LT |
64 | |
65 | #include <asm/uaccess.h> | |
66 | ||
67 | #ifdef CONFIG_SYSCTL | |
68 | #include <linux/sysctl.h> | |
69 | #endif | |
70 | ||
afc154e9 | 71 | enum rt6_nud_state { |
7e980569 JB |
72 | RT6_NUD_FAIL_HARD = -3, |
73 | RT6_NUD_FAIL_PROBE = -2, | |
74 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
75 | RT6_NUD_SUCCEED = 1 |
76 | }; | |
77 | ||
83a09abd | 78 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort); |
1da177e4 | 79 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 80 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 81 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
82 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
83 | static void ip6_dst_destroy(struct dst_entry *); | |
84 | static void ip6_dst_ifdown(struct dst_entry *, | |
85 | struct net_device *dev, int how); | |
569d3645 | 86 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
87 | |
88 | static int ip6_pkt_discard(struct sk_buff *skb); | |
aad88724 | 89 | static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb); |
7150aede | 90 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
aad88724 | 91 | static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 92 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
93 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
94 | struct sk_buff *skb, u32 mtu); | |
95 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
96 | struct sk_buff *skb); | |
4b32b5ad | 97 | static void rt6_dst_from_metrics_check(struct rt6_info *rt); |
52bd4c0c | 98 | static int rt6_score_route(struct rt6_info *rt, int oif, int strict); |
1da177e4 | 99 | |
70ceb4f5 | 100 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 101 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
102 | const struct in6_addr *prefix, int prefixlen, |
103 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 104 | unsigned int pref); |
efa2cea0 | 105 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
106 | const struct in6_addr *prefix, int prefixlen, |
107 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
108 | #endif |
109 | ||
8d0b94af MKL |
110 | struct uncached_list { |
111 | spinlock_t lock; | |
112 | struct list_head head; | |
113 | }; | |
114 | ||
115 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
116 | ||
117 | static void rt6_uncached_list_add(struct rt6_info *rt) | |
118 | { | |
119 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
120 | ||
121 | rt->dst.flags |= DST_NOCACHE; | |
122 | rt->rt6i_uncached_list = ul; | |
123 | ||
124 | spin_lock_bh(&ul->lock); | |
125 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
126 | spin_unlock_bh(&ul->lock); | |
127 | } | |
128 | ||
129 | static void rt6_uncached_list_del(struct rt6_info *rt) | |
130 | { | |
131 | if (!list_empty(&rt->rt6i_uncached)) { | |
132 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
133 | ||
134 | spin_lock_bh(&ul->lock); | |
135 | list_del(&rt->rt6i_uncached); | |
136 | spin_unlock_bh(&ul->lock); | |
137 | } | |
138 | } | |
139 | ||
140 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
141 | { | |
142 | struct net_device *loopback_dev = net->loopback_dev; | |
143 | int cpu; | |
144 | ||
e332bc67 EB |
145 | if (dev == loopback_dev) |
146 | return; | |
147 | ||
8d0b94af MKL |
148 | for_each_possible_cpu(cpu) { |
149 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
150 | struct rt6_info *rt; | |
151 | ||
152 | spin_lock_bh(&ul->lock); | |
153 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
154 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
155 | struct net_device *rt_dev = rt->dst.dev; | |
156 | ||
e332bc67 | 157 | if (rt_idev->dev == dev) { |
8d0b94af MKL |
158 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
159 | in6_dev_put(rt_idev); | |
160 | } | |
161 | ||
e332bc67 | 162 | if (rt_dev == dev) { |
8d0b94af MKL |
163 | rt->dst.dev = loopback_dev; |
164 | dev_hold(rt->dst.dev); | |
165 | dev_put(rt_dev); | |
166 | } | |
167 | } | |
168 | spin_unlock_bh(&ul->lock); | |
169 | } | |
170 | } | |
171 | ||
d52d3997 MKL |
172 | static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt) |
173 | { | |
174 | return dst_metrics_write_ptr(rt->dst.from); | |
175 | } | |
176 | ||
06582540 DM |
177 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
178 | { | |
4b32b5ad | 179 | struct rt6_info *rt = (struct rt6_info *)dst; |
06582540 | 180 | |
d52d3997 MKL |
181 | if (rt->rt6i_flags & RTF_PCPU) |
182 | return rt6_pcpu_cow_metrics(rt); | |
183 | else if (rt->rt6i_flags & RTF_CACHE) | |
4b32b5ad MKL |
184 | return NULL; |
185 | else | |
3b471175 | 186 | return dst_cow_metrics_generic(dst, old); |
06582540 DM |
187 | } |
188 | ||
f894cbf8 DM |
189 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
190 | struct sk_buff *skb, | |
191 | const void *daddr) | |
39232973 DM |
192 | { |
193 | struct in6_addr *p = &rt->rt6i_gateway; | |
194 | ||
a7563f34 | 195 | if (!ipv6_addr_any(p)) |
39232973 | 196 | return (const void *) p; |
f894cbf8 DM |
197 | else if (skb) |
198 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
199 | return daddr; |
200 | } | |
201 | ||
f894cbf8 DM |
202 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
203 | struct sk_buff *skb, | |
204 | const void *daddr) | |
d3aaeb38 | 205 | { |
39232973 DM |
206 | struct rt6_info *rt = (struct rt6_info *) dst; |
207 | struct neighbour *n; | |
208 | ||
f894cbf8 | 209 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 210 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
211 | if (n) |
212 | return n; | |
213 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
214 | } | |
215 | ||
9a7ec3a9 | 216 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 217 | .family = AF_INET6, |
1da177e4 LT |
218 | .gc = ip6_dst_gc, |
219 | .gc_thresh = 1024, | |
220 | .check = ip6_dst_check, | |
0dbaee3b | 221 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 222 | .mtu = ip6_mtu, |
06582540 | 223 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
224 | .destroy = ip6_dst_destroy, |
225 | .ifdown = ip6_dst_ifdown, | |
226 | .negative_advice = ip6_negative_advice, | |
227 | .link_failure = ip6_link_failure, | |
228 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 229 | .redirect = rt6_do_redirect, |
1ac06e03 | 230 | .local_out = __ip6_local_out, |
d3aaeb38 | 231 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
232 | }; |
233 | ||
ebb762f2 | 234 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 235 | { |
618f9bc7 SK |
236 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
237 | ||
238 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
239 | } |
240 | ||
6700c270 DM |
241 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
242 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
243 | { |
244 | } | |
245 | ||
6700c270 DM |
246 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
247 | struct sk_buff *skb) | |
b587ee3b DM |
248 | { |
249 | } | |
250 | ||
14e50e57 DM |
251 | static struct dst_ops ip6_dst_blackhole_ops = { |
252 | .family = AF_INET6, | |
14e50e57 DM |
253 | .destroy = ip6_dst_destroy, |
254 | .check = ip6_dst_check, | |
ebb762f2 | 255 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 256 | .default_advmss = ip6_default_advmss, |
14e50e57 | 257 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 258 | .redirect = ip6_rt_blackhole_redirect, |
0a1f5962 | 259 | .cow_metrics = dst_cow_metrics_generic, |
d3aaeb38 | 260 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
261 | }; |
262 | ||
62fa8a84 | 263 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 264 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
265 | }; |
266 | ||
fb0af4c7 | 267 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
268 | .dst = { |
269 | .__refcnt = ATOMIC_INIT(1), | |
270 | .__use = 1, | |
2c20cbd7 | 271 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 272 | .error = -ENETUNREACH, |
d8d1f30b CG |
273 | .input = ip6_pkt_discard, |
274 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
275 | }, |
276 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 277 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
278 | .rt6i_metric = ~(u32) 0, |
279 | .rt6i_ref = ATOMIC_INIT(1), | |
280 | }; | |
281 | ||
101367c2 TG |
282 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
283 | ||
fb0af4c7 | 284 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
285 | .dst = { |
286 | .__refcnt = ATOMIC_INIT(1), | |
287 | .__use = 1, | |
2c20cbd7 | 288 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 289 | .error = -EACCES, |
d8d1f30b CG |
290 | .input = ip6_pkt_prohibit, |
291 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
292 | }, |
293 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 294 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
295 | .rt6i_metric = ~(u32) 0, |
296 | .rt6i_ref = ATOMIC_INIT(1), | |
297 | }; | |
298 | ||
fb0af4c7 | 299 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
300 | .dst = { |
301 | .__refcnt = ATOMIC_INIT(1), | |
302 | .__use = 1, | |
2c20cbd7 | 303 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 304 | .error = -EINVAL, |
d8d1f30b | 305 | .input = dst_discard, |
aad88724 | 306 | .output = dst_discard_sk, |
101367c2 TG |
307 | }, |
308 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 309 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
310 | .rt6i_metric = ~(u32) 0, |
311 | .rt6i_ref = ATOMIC_INIT(1), | |
312 | }; | |
313 | ||
314 | #endif | |
315 | ||
ebfa45f0 MKL |
316 | static void rt6_info_init(struct rt6_info *rt) |
317 | { | |
318 | struct dst_entry *dst = &rt->dst; | |
319 | ||
320 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
321 | INIT_LIST_HEAD(&rt->rt6i_siblings); | |
322 | INIT_LIST_HEAD(&rt->rt6i_uncached); | |
323 | } | |
324 | ||
1da177e4 | 325 | /* allocate dst with ip6_dst_ops */ |
d52d3997 MKL |
326 | static struct rt6_info *__ip6_dst_alloc(struct net *net, |
327 | struct net_device *dev, | |
ad706862 | 328 | int flags) |
1da177e4 | 329 | { |
97bab73f | 330 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 331 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 332 | |
ebfa45f0 MKL |
333 | if (rt) |
334 | rt6_info_init(rt); | |
8104891b | 335 | |
cf911662 | 336 | return rt; |
1da177e4 LT |
337 | } |
338 | ||
d52d3997 MKL |
339 | static struct rt6_info *ip6_dst_alloc(struct net *net, |
340 | struct net_device *dev, | |
ad706862 | 341 | int flags) |
d52d3997 | 342 | { |
ad706862 | 343 | struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags); |
d52d3997 MKL |
344 | |
345 | if (rt) { | |
346 | rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC); | |
347 | if (rt->rt6i_pcpu) { | |
348 | int cpu; | |
349 | ||
350 | for_each_possible_cpu(cpu) { | |
351 | struct rt6_info **p; | |
352 | ||
353 | p = per_cpu_ptr(rt->rt6i_pcpu, cpu); | |
354 | /* no one shares rt */ | |
355 | *p = NULL; | |
356 | } | |
357 | } else { | |
358 | dst_destroy((struct dst_entry *)rt); | |
359 | return NULL; | |
360 | } | |
361 | } | |
362 | ||
363 | return rt; | |
364 | } | |
365 | ||
1da177e4 LT |
366 | static void ip6_dst_destroy(struct dst_entry *dst) |
367 | { | |
368 | struct rt6_info *rt = (struct rt6_info *)dst; | |
ecd98837 | 369 | struct dst_entry *from = dst->from; |
8d0b94af | 370 | struct inet6_dev *idev; |
1da177e4 | 371 | |
4b32b5ad | 372 | dst_destroy_metrics_generic(dst); |
87775312 | 373 | free_percpu(rt->rt6i_pcpu); |
8d0b94af MKL |
374 | rt6_uncached_list_del(rt); |
375 | ||
376 | idev = rt->rt6i_idev; | |
38308473 | 377 | if (idev) { |
1da177e4 LT |
378 | rt->rt6i_idev = NULL; |
379 | in6_dev_put(idev); | |
1ab1457c | 380 | } |
1716a961 | 381 | |
ecd98837 YH |
382 | dst->from = NULL; |
383 | dst_release(from); | |
b3419363 DM |
384 | } |
385 | ||
1da177e4 LT |
386 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
387 | int how) | |
388 | { | |
389 | struct rt6_info *rt = (struct rt6_info *)dst; | |
390 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 391 | struct net_device *loopback_dev = |
c346dca1 | 392 | dev_net(dev)->loopback_dev; |
1da177e4 | 393 | |
97cac082 DM |
394 | if (dev != loopback_dev) { |
395 | if (idev && idev->dev == dev) { | |
396 | struct inet6_dev *loopback_idev = | |
397 | in6_dev_get(loopback_dev); | |
398 | if (loopback_idev) { | |
399 | rt->rt6i_idev = loopback_idev; | |
400 | in6_dev_put(idev); | |
401 | } | |
402 | } | |
1da177e4 LT |
403 | } |
404 | } | |
405 | ||
a50feda5 | 406 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 407 | { |
1716a961 G |
408 | if (rt->rt6i_flags & RTF_EXPIRES) { |
409 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 410 | return true; |
1716a961 | 411 | } else if (rt->dst.from) { |
3fd91fb3 | 412 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 413 | } |
a50feda5 | 414 | return false; |
1da177e4 LT |
415 | } |
416 | ||
51ebd318 ND |
417 | /* Multipath route selection: |
418 | * Hash based function using packet header and flowlabel. | |
419 | * Adapted from fib_info_hashfn() | |
420 | */ | |
421 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
422 | const struct flowi6 *fl6) | |
423 | { | |
424 | unsigned int val = fl6->flowi6_proto; | |
425 | ||
c08977bb YH |
426 | val ^= ipv6_addr_hash(&fl6->daddr); |
427 | val ^= ipv6_addr_hash(&fl6->saddr); | |
51ebd318 ND |
428 | |
429 | /* Work only if this not encapsulated */ | |
430 | switch (fl6->flowi6_proto) { | |
431 | case IPPROTO_UDP: | |
432 | case IPPROTO_TCP: | |
433 | case IPPROTO_SCTP: | |
b3ce5ae1 ND |
434 | val ^= (__force u16)fl6->fl6_sport; |
435 | val ^= (__force u16)fl6->fl6_dport; | |
51ebd318 ND |
436 | break; |
437 | ||
438 | case IPPROTO_ICMPV6: | |
b3ce5ae1 ND |
439 | val ^= (__force u16)fl6->fl6_icmp_type; |
440 | val ^= (__force u16)fl6->fl6_icmp_code; | |
51ebd318 ND |
441 | break; |
442 | } | |
443 | /* RFC6438 recommands to use flowlabel */ | |
b3ce5ae1 | 444 | val ^= (__force u32)fl6->flowlabel; |
51ebd318 ND |
445 | |
446 | /* Perhaps, we need to tune, this function? */ | |
447 | val = val ^ (val >> 7) ^ (val >> 12); | |
448 | return val % candidate_count; | |
449 | } | |
450 | ||
451 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
52bd4c0c ND |
452 | struct flowi6 *fl6, int oif, |
453 | int strict) | |
51ebd318 ND |
454 | { |
455 | struct rt6_info *sibling, *next_sibling; | |
456 | int route_choosen; | |
457 | ||
458 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
459 | /* Don't change the route, if route_choosen == 0 | |
460 | * (siblings does not include ourself) | |
461 | */ | |
462 | if (route_choosen) | |
463 | list_for_each_entry_safe(sibling, next_sibling, | |
464 | &match->rt6i_siblings, rt6i_siblings) { | |
465 | route_choosen--; | |
466 | if (route_choosen == 0) { | |
52bd4c0c ND |
467 | if (rt6_score_route(sibling, oif, strict) < 0) |
468 | break; | |
51ebd318 ND |
469 | match = sibling; |
470 | break; | |
471 | } | |
472 | } | |
473 | return match; | |
474 | } | |
475 | ||
1da177e4 | 476 | /* |
c71099ac | 477 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
478 | */ |
479 | ||
8ed67789 DL |
480 | static inline struct rt6_info *rt6_device_match(struct net *net, |
481 | struct rt6_info *rt, | |
b71d1d42 | 482 | const struct in6_addr *saddr, |
1da177e4 | 483 | int oif, |
d420895e | 484 | int flags) |
1da177e4 LT |
485 | { |
486 | struct rt6_info *local = NULL; | |
487 | struct rt6_info *sprt; | |
488 | ||
dd3abc4e YH |
489 | if (!oif && ipv6_addr_any(saddr)) |
490 | goto out; | |
491 | ||
d8d1f30b | 492 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 493 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
494 | |
495 | if (oif) { | |
1da177e4 LT |
496 | if (dev->ifindex == oif) |
497 | return sprt; | |
498 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 499 | if (!sprt->rt6i_idev || |
1da177e4 | 500 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 501 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 502 | continue; |
1ab1457c | 503 | if (local && (!oif || |
1da177e4 LT |
504 | local->rt6i_idev->dev->ifindex == oif)) |
505 | continue; | |
506 | } | |
507 | local = sprt; | |
508 | } | |
dd3abc4e YH |
509 | } else { |
510 | if (ipv6_chk_addr(net, saddr, dev, | |
511 | flags & RT6_LOOKUP_F_IFACE)) | |
512 | return sprt; | |
1da177e4 | 513 | } |
dd3abc4e | 514 | } |
1da177e4 | 515 | |
dd3abc4e | 516 | if (oif) { |
1da177e4 LT |
517 | if (local) |
518 | return local; | |
519 | ||
d420895e | 520 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 521 | return net->ipv6.ip6_null_entry; |
1da177e4 | 522 | } |
dd3abc4e | 523 | out: |
1da177e4 LT |
524 | return rt; |
525 | } | |
526 | ||
27097255 | 527 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
528 | struct __rt6_probe_work { |
529 | struct work_struct work; | |
530 | struct in6_addr target; | |
531 | struct net_device *dev; | |
532 | }; | |
533 | ||
534 | static void rt6_probe_deferred(struct work_struct *w) | |
535 | { | |
536 | struct in6_addr mcaddr; | |
537 | struct __rt6_probe_work *work = | |
538 | container_of(w, struct __rt6_probe_work, work); | |
539 | ||
540 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
ab450605 | 541 | ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL, NULL); |
c2f17e82 | 542 | dev_put(work->dev); |
662f5533 | 543 | kfree(work); |
c2f17e82 HFS |
544 | } |
545 | ||
27097255 YH |
546 | static void rt6_probe(struct rt6_info *rt) |
547 | { | |
990edb42 | 548 | struct __rt6_probe_work *work; |
f2c31e32 | 549 | struct neighbour *neigh; |
27097255 YH |
550 | /* |
551 | * Okay, this does not seem to be appropriate | |
552 | * for now, however, we need to check if it | |
553 | * is really so; aka Router Reachability Probing. | |
554 | * | |
555 | * Router Reachability Probe MUST be rate-limited | |
556 | * to no more than one per minute. | |
557 | */ | |
2152caea | 558 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 559 | return; |
2152caea YH |
560 | rcu_read_lock_bh(); |
561 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
562 | if (neigh) { | |
8d6c31bf MKL |
563 | if (neigh->nud_state & NUD_VALID) |
564 | goto out; | |
565 | ||
990edb42 | 566 | work = NULL; |
2152caea | 567 | write_lock(&neigh->lock); |
990edb42 MKL |
568 | if (!(neigh->nud_state & NUD_VALID) && |
569 | time_after(jiffies, | |
570 | neigh->updated + | |
571 | rt->rt6i_idev->cnf.rtr_probe_interval)) { | |
572 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
573 | if (work) | |
574 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 575 | } |
2152caea | 576 | write_unlock(&neigh->lock); |
990edb42 MKL |
577 | } else { |
578 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
f2c31e32 | 579 | } |
990edb42 MKL |
580 | |
581 | if (work) { | |
582 | INIT_WORK(&work->work, rt6_probe_deferred); | |
583 | work->target = rt->rt6i_gateway; | |
584 | dev_hold(rt->dst.dev); | |
585 | work->dev = rt->dst.dev; | |
586 | schedule_work(&work->work); | |
587 | } | |
588 | ||
8d6c31bf | 589 | out: |
2152caea | 590 | rcu_read_unlock_bh(); |
27097255 YH |
591 | } |
592 | #else | |
593 | static inline void rt6_probe(struct rt6_info *rt) | |
594 | { | |
27097255 YH |
595 | } |
596 | #endif | |
597 | ||
1da177e4 | 598 | /* |
554cfb7e | 599 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 600 | */ |
b6f99a21 | 601 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 602 | { |
d1918542 | 603 | struct net_device *dev = rt->dst.dev; |
161980f4 | 604 | if (!oif || dev->ifindex == oif) |
554cfb7e | 605 | return 2; |
161980f4 DM |
606 | if ((dev->flags & IFF_LOOPBACK) && |
607 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
608 | return 1; | |
609 | return 0; | |
554cfb7e | 610 | } |
1da177e4 | 611 | |
afc154e9 | 612 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 613 | { |
f2c31e32 | 614 | struct neighbour *neigh; |
afc154e9 | 615 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 616 | |
4d0c5911 YH |
617 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
618 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 619 | return RT6_NUD_SUCCEED; |
145a3621 YH |
620 | |
621 | rcu_read_lock_bh(); | |
622 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
623 | if (neigh) { | |
624 | read_lock(&neigh->lock); | |
554cfb7e | 625 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 626 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 627 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 628 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 629 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
630 | else |
631 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 632 | #endif |
145a3621 | 633 | read_unlock(&neigh->lock); |
afc154e9 HFS |
634 | } else { |
635 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 636 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 637 | } |
145a3621 YH |
638 | rcu_read_unlock_bh(); |
639 | ||
a5a81f0b | 640 | return ret; |
1da177e4 LT |
641 | } |
642 | ||
554cfb7e YH |
643 | static int rt6_score_route(struct rt6_info *rt, int oif, |
644 | int strict) | |
1da177e4 | 645 | { |
a5a81f0b | 646 | int m; |
1ab1457c | 647 | |
4d0c5911 | 648 | m = rt6_check_dev(rt, oif); |
77d16f45 | 649 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 650 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
651 | #ifdef CONFIG_IPV6_ROUTER_PREF |
652 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
653 | #endif | |
afc154e9 HFS |
654 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
655 | int n = rt6_check_neigh(rt); | |
656 | if (n < 0) | |
657 | return n; | |
658 | } | |
554cfb7e YH |
659 | return m; |
660 | } | |
661 | ||
f11e6659 | 662 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
663 | int *mpri, struct rt6_info *match, |
664 | bool *do_rr) | |
554cfb7e | 665 | { |
f11e6659 | 666 | int m; |
afc154e9 | 667 | bool match_do_rr = false; |
35103d11 AG |
668 | struct inet6_dev *idev = rt->rt6i_idev; |
669 | struct net_device *dev = rt->dst.dev; | |
670 | ||
671 | if (dev && !netif_carrier_ok(dev) && | |
672 | idev->cnf.ignore_routes_with_linkdown) | |
673 | goto out; | |
f11e6659 DM |
674 | |
675 | if (rt6_check_expired(rt)) | |
676 | goto out; | |
677 | ||
678 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 679 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
680 | match_do_rr = true; |
681 | m = 0; /* lowest valid score */ | |
7e980569 | 682 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 683 | goto out; |
afc154e9 HFS |
684 | } |
685 | ||
686 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
687 | rt6_probe(rt); | |
f11e6659 | 688 | |
7e980569 | 689 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 690 | if (m > *mpri) { |
afc154e9 | 691 | *do_rr = match_do_rr; |
f11e6659 DM |
692 | *mpri = m; |
693 | match = rt; | |
f11e6659 | 694 | } |
f11e6659 DM |
695 | out: |
696 | return match; | |
697 | } | |
698 | ||
699 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
700 | struct rt6_info *rr_head, | |
afc154e9 HFS |
701 | u32 metric, int oif, int strict, |
702 | bool *do_rr) | |
f11e6659 | 703 | { |
9fbdcfaf | 704 | struct rt6_info *rt, *match, *cont; |
554cfb7e | 705 | int mpri = -1; |
1da177e4 | 706 | |
f11e6659 | 707 | match = NULL; |
9fbdcfaf SK |
708 | cont = NULL; |
709 | for (rt = rr_head; rt; rt = rt->dst.rt6_next) { | |
710 | if (rt->rt6i_metric != metric) { | |
711 | cont = rt; | |
712 | break; | |
713 | } | |
714 | ||
715 | match = find_match(rt, oif, strict, &mpri, match, do_rr); | |
716 | } | |
717 | ||
718 | for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) { | |
719 | if (rt->rt6i_metric != metric) { | |
720 | cont = rt; | |
721 | break; | |
722 | } | |
723 | ||
afc154e9 | 724 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
9fbdcfaf SK |
725 | } |
726 | ||
727 | if (match || !cont) | |
728 | return match; | |
729 | ||
730 | for (rt = cont; rt; rt = rt->dst.rt6_next) | |
afc154e9 | 731 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 732 | |
f11e6659 DM |
733 | return match; |
734 | } | |
1da177e4 | 735 | |
f11e6659 DM |
736 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
737 | { | |
738 | struct rt6_info *match, *rt0; | |
8ed67789 | 739 | struct net *net; |
afc154e9 | 740 | bool do_rr = false; |
1da177e4 | 741 | |
f11e6659 DM |
742 | rt0 = fn->rr_ptr; |
743 | if (!rt0) | |
744 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 745 | |
afc154e9 HFS |
746 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
747 | &do_rr); | |
1da177e4 | 748 | |
afc154e9 | 749 | if (do_rr) { |
d8d1f30b | 750 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 751 | |
554cfb7e | 752 | /* no entries matched; do round-robin */ |
f11e6659 DM |
753 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
754 | next = fn->leaf; | |
755 | ||
756 | if (next != rt0) | |
757 | fn->rr_ptr = next; | |
1da177e4 | 758 | } |
1da177e4 | 759 | |
d1918542 | 760 | net = dev_net(rt0->dst.dev); |
a02cec21 | 761 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
762 | } |
763 | ||
8b9df265 MKL |
764 | static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt) |
765 | { | |
766 | return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)); | |
767 | } | |
768 | ||
70ceb4f5 YH |
769 | #ifdef CONFIG_IPV6_ROUTE_INFO |
770 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 771 | const struct in6_addr *gwaddr) |
70ceb4f5 | 772 | { |
c346dca1 | 773 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
774 | struct route_info *rinfo = (struct route_info *) opt; |
775 | struct in6_addr prefix_buf, *prefix; | |
776 | unsigned int pref; | |
4bed72e4 | 777 | unsigned long lifetime; |
70ceb4f5 YH |
778 | struct rt6_info *rt; |
779 | ||
780 | if (len < sizeof(struct route_info)) { | |
781 | return -EINVAL; | |
782 | } | |
783 | ||
784 | /* Sanity check for prefix_len and length */ | |
785 | if (rinfo->length > 3) { | |
786 | return -EINVAL; | |
787 | } else if (rinfo->prefix_len > 128) { | |
788 | return -EINVAL; | |
789 | } else if (rinfo->prefix_len > 64) { | |
790 | if (rinfo->length < 2) { | |
791 | return -EINVAL; | |
792 | } | |
793 | } else if (rinfo->prefix_len > 0) { | |
794 | if (rinfo->length < 1) { | |
795 | return -EINVAL; | |
796 | } | |
797 | } | |
798 | ||
799 | pref = rinfo->route_pref; | |
800 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 801 | return -EINVAL; |
70ceb4f5 | 802 | |
4bed72e4 | 803 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
804 | |
805 | if (rinfo->length == 3) | |
806 | prefix = (struct in6_addr *)rinfo->prefix; | |
807 | else { | |
808 | /* this function is safe */ | |
809 | ipv6_addr_prefix(&prefix_buf, | |
810 | (struct in6_addr *)rinfo->prefix, | |
811 | rinfo->prefix_len); | |
812 | prefix = &prefix_buf; | |
813 | } | |
814 | ||
f104a567 DJ |
815 | if (rinfo->prefix_len == 0) |
816 | rt = rt6_get_dflt_router(gwaddr, dev); | |
817 | else | |
818 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
819 | gwaddr, dev->ifindex); | |
70ceb4f5 YH |
820 | |
821 | if (rt && !lifetime) { | |
e0a1ad73 | 822 | ip6_del_rt(rt); |
70ceb4f5 YH |
823 | rt = NULL; |
824 | } | |
825 | ||
826 | if (!rt && lifetime) | |
efa2cea0 | 827 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
828 | pref); |
829 | else if (rt) | |
830 | rt->rt6i_flags = RTF_ROUTEINFO | | |
831 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
832 | ||
833 | if (rt) { | |
1716a961 G |
834 | if (!addrconf_finite_timeout(lifetime)) |
835 | rt6_clean_expires(rt); | |
836 | else | |
837 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
838 | ||
94e187c0 | 839 | ip6_rt_put(rt); |
70ceb4f5 YH |
840 | } |
841 | return 0; | |
842 | } | |
843 | #endif | |
844 | ||
a3c00e46 MKL |
845 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
846 | struct in6_addr *saddr) | |
847 | { | |
848 | struct fib6_node *pn; | |
849 | while (1) { | |
850 | if (fn->fn_flags & RTN_TL_ROOT) | |
851 | return NULL; | |
852 | pn = fn->parent; | |
853 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) | |
854 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); | |
855 | else | |
856 | fn = pn; | |
857 | if (fn->fn_flags & RTN_RTINFO) | |
858 | return fn; | |
859 | } | |
860 | } | |
c71099ac | 861 | |
8ed67789 DL |
862 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
863 | struct fib6_table *table, | |
4c9483b2 | 864 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
865 | { |
866 | struct fib6_node *fn; | |
867 | struct rt6_info *rt; | |
868 | ||
c71099ac | 869 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 870 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
871 | restart: |
872 | rt = fn->leaf; | |
4c9483b2 | 873 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 | 874 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
52bd4c0c | 875 | rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); |
a3c00e46 MKL |
876 | if (rt == net->ipv6.ip6_null_entry) { |
877 | fn = fib6_backtrack(fn, &fl6->saddr); | |
878 | if (fn) | |
879 | goto restart; | |
880 | } | |
d8d1f30b | 881 | dst_use(&rt->dst, jiffies); |
c71099ac | 882 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
883 | return rt; |
884 | ||
885 | } | |
886 | ||
67ba4152 | 887 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
ea6e574e FW |
888 | int flags) |
889 | { | |
890 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
891 | } | |
892 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
893 | ||
9acd9f3a YH |
894 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
895 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 896 | { |
4c9483b2 DM |
897 | struct flowi6 fl6 = { |
898 | .flowi6_oif = oif, | |
899 | .daddr = *daddr, | |
c71099ac TG |
900 | }; |
901 | struct dst_entry *dst; | |
77d16f45 | 902 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 903 | |
adaa70bb | 904 | if (saddr) { |
4c9483b2 | 905 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
906 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
907 | } | |
908 | ||
4c9483b2 | 909 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
910 | if (dst->error == 0) |
911 | return (struct rt6_info *) dst; | |
912 | ||
913 | dst_release(dst); | |
914 | ||
1da177e4 LT |
915 | return NULL; |
916 | } | |
7159039a YH |
917 | EXPORT_SYMBOL(rt6_lookup); |
918 | ||
c71099ac | 919 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
920 | It takes new route entry, the addition fails by any reason the |
921 | route is freed. In any case, if caller does not hold it, it may | |
922 | be destroyed. | |
923 | */ | |
924 | ||
e5fd387a | 925 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, |
e715b6d3 | 926 | struct mx6_config *mxc) |
1da177e4 LT |
927 | { |
928 | int err; | |
c71099ac | 929 | struct fib6_table *table; |
1da177e4 | 930 | |
c71099ac TG |
931 | table = rt->rt6i_table; |
932 | write_lock_bh(&table->tb6_lock); | |
e715b6d3 | 933 | err = fib6_add(&table->tb6_root, rt, info, mxc); |
c71099ac | 934 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
935 | |
936 | return err; | |
937 | } | |
938 | ||
40e22e8f TG |
939 | int ip6_ins_rt(struct rt6_info *rt) |
940 | { | |
e715b6d3 FW |
941 | struct nl_info info = { .nl_net = dev_net(rt->dst.dev), }; |
942 | struct mx6_config mxc = { .mx = NULL, }; | |
943 | ||
944 | return __ip6_ins_rt(rt, &info, &mxc); | |
40e22e8f TG |
945 | } |
946 | ||
8b9df265 MKL |
947 | static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort, |
948 | const struct in6_addr *daddr, | |
949 | const struct in6_addr *saddr) | |
1da177e4 | 950 | { |
1da177e4 LT |
951 | struct rt6_info *rt; |
952 | ||
953 | /* | |
954 | * Clone the route. | |
955 | */ | |
956 | ||
d52d3997 | 957 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) |
83a09abd | 958 | ort = (struct rt6_info *)ort->dst.from; |
1da177e4 | 959 | |
ad706862 | 960 | rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0); |
83a09abd MKL |
961 | |
962 | if (!rt) | |
963 | return NULL; | |
964 | ||
965 | ip6_rt_copy_init(rt, ort); | |
966 | rt->rt6i_flags |= RTF_CACHE; | |
967 | rt->rt6i_metric = 0; | |
968 | rt->dst.flags |= DST_HOST; | |
969 | rt->rt6i_dst.addr = *daddr; | |
970 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 971 | |
83a09abd MKL |
972 | if (!rt6_is_gw_or_nonexthop(ort)) { |
973 | if (ort->rt6i_dst.plen != 128 && | |
974 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
975 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 976 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
977 | if (rt->rt6i_src.plen && saddr) { |
978 | rt->rt6i_src.addr = *saddr; | |
979 | rt->rt6i_src.plen = 128; | |
8b9df265 | 980 | } |
83a09abd | 981 | #endif |
95a9a5ba | 982 | } |
1da177e4 | 983 | |
95a9a5ba YH |
984 | return rt; |
985 | } | |
1da177e4 | 986 | |
d52d3997 MKL |
987 | static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt) |
988 | { | |
989 | struct rt6_info *pcpu_rt; | |
990 | ||
991 | pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev), | |
ad706862 | 992 | rt->dst.dev, rt->dst.flags); |
d52d3997 MKL |
993 | |
994 | if (!pcpu_rt) | |
995 | return NULL; | |
996 | ip6_rt_copy_init(pcpu_rt, rt); | |
997 | pcpu_rt->rt6i_protocol = rt->rt6i_protocol; | |
998 | pcpu_rt->rt6i_flags |= RTF_PCPU; | |
999 | return pcpu_rt; | |
1000 | } | |
1001 | ||
1002 | /* It should be called with read_lock_bh(&tb6_lock) acquired */ | |
1003 | static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt) | |
1004 | { | |
a73e4195 | 1005 | struct rt6_info *pcpu_rt, **p; |
d52d3997 MKL |
1006 | |
1007 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1008 | pcpu_rt = *p; | |
1009 | ||
a73e4195 MKL |
1010 | if (pcpu_rt) { |
1011 | dst_hold(&pcpu_rt->dst); | |
1012 | rt6_dst_from_metrics_check(pcpu_rt); | |
1013 | } | |
1014 | return pcpu_rt; | |
1015 | } | |
1016 | ||
1017 | static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt) | |
1018 | { | |
9c7370a1 | 1019 | struct fib6_table *table = rt->rt6i_table; |
a73e4195 | 1020 | struct rt6_info *pcpu_rt, *prev, **p; |
d52d3997 MKL |
1021 | |
1022 | pcpu_rt = ip6_rt_pcpu_alloc(rt); | |
1023 | if (!pcpu_rt) { | |
1024 | struct net *net = dev_net(rt->dst.dev); | |
1025 | ||
9c7370a1 MKL |
1026 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
1027 | return net->ipv6.ip6_null_entry; | |
d52d3997 MKL |
1028 | } |
1029 | ||
9c7370a1 MKL |
1030 | read_lock_bh(&table->tb6_lock); |
1031 | if (rt->rt6i_pcpu) { | |
1032 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1033 | prev = cmpxchg(p, NULL, pcpu_rt); | |
1034 | if (prev) { | |
1035 | /* If someone did it before us, return prev instead */ | |
1036 | dst_destroy(&pcpu_rt->dst); | |
1037 | pcpu_rt = prev; | |
1038 | } | |
1039 | } else { | |
1040 | /* rt has been removed from the fib6 tree | |
1041 | * before we have a chance to acquire the read_lock. | |
1042 | * In this case, don't brother to create a pcpu rt | |
1043 | * since rt is going away anyway. The next | |
1044 | * dst_check() will trigger a re-lookup. | |
1045 | */ | |
d52d3997 | 1046 | dst_destroy(&pcpu_rt->dst); |
9c7370a1 | 1047 | pcpu_rt = rt; |
d52d3997 | 1048 | } |
d52d3997 MKL |
1049 | dst_hold(&pcpu_rt->dst); |
1050 | rt6_dst_from_metrics_check(pcpu_rt); | |
9c7370a1 | 1051 | read_unlock_bh(&table->tb6_lock); |
d52d3997 MKL |
1052 | return pcpu_rt; |
1053 | } | |
1054 | ||
8ed67789 | 1055 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 1056 | struct flowi6 *fl6, int flags) |
1da177e4 | 1057 | { |
367efcb9 | 1058 | struct fib6_node *fn, *saved_fn; |
45e4fd26 | 1059 | struct rt6_info *rt; |
c71099ac | 1060 | int strict = 0; |
1da177e4 | 1061 | |
77d16f45 | 1062 | strict |= flags & RT6_LOOKUP_F_IFACE; |
367efcb9 MKL |
1063 | if (net->ipv6.devconf_all->forwarding == 0) |
1064 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1da177e4 | 1065 | |
c71099ac | 1066 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 1067 | |
4c9483b2 | 1068 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 1069 | saved_fn = fn; |
1da177e4 | 1070 | |
f1900fb5 DA |
1071 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1072 | oif = 0; | |
1073 | ||
a3c00e46 | 1074 | redo_rt6_select: |
367efcb9 | 1075 | rt = rt6_select(fn, oif, strict); |
52bd4c0c | 1076 | if (rt->rt6i_nsiblings) |
367efcb9 | 1077 | rt = rt6_multipath_select(rt, fl6, oif, strict); |
a3c00e46 MKL |
1078 | if (rt == net->ipv6.ip6_null_entry) { |
1079 | fn = fib6_backtrack(fn, &fl6->saddr); | |
1080 | if (fn) | |
1081 | goto redo_rt6_select; | |
367efcb9 MKL |
1082 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
1083 | /* also consider unreachable route */ | |
1084 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
1085 | fn = saved_fn; | |
1086 | goto redo_rt6_select; | |
367efcb9 | 1087 | } |
a3c00e46 MKL |
1088 | } |
1089 | ||
fb9de91e | 1090 | |
3da59bd9 | 1091 | if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) { |
d52d3997 MKL |
1092 | dst_use(&rt->dst, jiffies); |
1093 | read_unlock_bh(&table->tb6_lock); | |
1094 | ||
1095 | rt6_dst_from_metrics_check(rt); | |
1096 | return rt; | |
3da59bd9 MKL |
1097 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
1098 | !(rt->rt6i_flags & RTF_GATEWAY))) { | |
1099 | /* Create a RTF_CACHE clone which will not be | |
1100 | * owned by the fib6 tree. It is for the special case where | |
1101 | * the daddr in the skb during the neighbor look-up is different | |
1102 | * from the fl6->daddr used to look-up route here. | |
1103 | */ | |
1104 | ||
1105 | struct rt6_info *uncached_rt; | |
1106 | ||
d52d3997 MKL |
1107 | dst_use(&rt->dst, jiffies); |
1108 | read_unlock_bh(&table->tb6_lock); | |
1109 | ||
3da59bd9 MKL |
1110 | uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL); |
1111 | dst_release(&rt->dst); | |
c71099ac | 1112 | |
3da59bd9 | 1113 | if (uncached_rt) |
8d0b94af | 1114 | rt6_uncached_list_add(uncached_rt); |
3da59bd9 MKL |
1115 | else |
1116 | uncached_rt = net->ipv6.ip6_null_entry; | |
d52d3997 | 1117 | |
3da59bd9 MKL |
1118 | dst_hold(&uncached_rt->dst); |
1119 | return uncached_rt; | |
3da59bd9 | 1120 | |
d52d3997 MKL |
1121 | } else { |
1122 | /* Get a percpu copy */ | |
1123 | ||
1124 | struct rt6_info *pcpu_rt; | |
1125 | ||
1126 | rt->dst.lastuse = jiffies; | |
1127 | rt->dst.__use++; | |
1128 | pcpu_rt = rt6_get_pcpu_route(rt); | |
d52d3997 | 1129 | |
9c7370a1 MKL |
1130 | if (pcpu_rt) { |
1131 | read_unlock_bh(&table->tb6_lock); | |
1132 | } else { | |
1133 | /* We have to do the read_unlock first | |
1134 | * because rt6_make_pcpu_route() may trigger | |
1135 | * ip6_dst_gc() which will take the write_lock. | |
1136 | */ | |
1137 | dst_hold(&rt->dst); | |
1138 | read_unlock_bh(&table->tb6_lock); | |
a73e4195 | 1139 | pcpu_rt = rt6_make_pcpu_route(rt); |
9c7370a1 MKL |
1140 | dst_release(&rt->dst); |
1141 | } | |
d52d3997 MKL |
1142 | |
1143 | return pcpu_rt; | |
9c7370a1 | 1144 | |
d52d3997 | 1145 | } |
1da177e4 LT |
1146 | } |
1147 | ||
8ed67789 | 1148 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 1149 | struct flowi6 *fl6, int flags) |
4acad72d | 1150 | { |
4c9483b2 | 1151 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
1152 | } |
1153 | ||
72331bc0 SL |
1154 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
1155 | struct net_device *dev, | |
1156 | struct flowi6 *fl6, int flags) | |
1157 | { | |
1158 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1159 | flags |= RT6_LOOKUP_F_IFACE; | |
1160 | ||
1161 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1162 | } | |
1163 | ||
c71099ac TG |
1164 | void ip6_route_input(struct sk_buff *skb) |
1165 | { | |
b71d1d42 | 1166 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1167 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1168 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
904af04d | 1169 | struct ip_tunnel_info *tun_info; |
4c9483b2 DM |
1170 | struct flowi6 fl6 = { |
1171 | .flowi6_iif = skb->dev->ifindex, | |
1172 | .daddr = iph->daddr, | |
1173 | .saddr = iph->saddr, | |
6502ca52 | 1174 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1175 | .flowi6_mark = skb->mark, |
1176 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1177 | }; |
adaa70bb | 1178 | |
904af04d | 1179 | tun_info = skb_tunnel_info(skb); |
46fa062a | 1180 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 1181 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
06e9d040 | 1182 | skb_dst_drop(skb); |
72331bc0 | 1183 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1184 | } |
1185 | ||
8ed67789 | 1186 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1187 | struct flowi6 *fl6, int flags) |
1da177e4 | 1188 | { |
4c9483b2 | 1189 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1190 | } |
1191 | ||
67ba4152 | 1192 | struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 1193 | struct flowi6 *fl6) |
c71099ac TG |
1194 | { |
1195 | int flags = 0; | |
1196 | ||
1fb9489b | 1197 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1198 | |
741a11d9 DA |
1199 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
1200 | fl6->flowi6_oif) | |
77d16f45 | 1201 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1202 | |
4c9483b2 | 1203 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 1204 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1205 | else if (sk) |
1206 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1207 | |
4c9483b2 | 1208 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 | 1209 | } |
7159039a | 1210 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 1211 | |
2774c131 | 1212 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1213 | { |
5c1e6aa3 | 1214 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1215 | struct dst_entry *new = NULL; |
1216 | ||
f5b0a874 | 1217 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1218 | if (rt) { |
0a1f5962 | 1219 | rt6_info_init(rt); |
8104891b | 1220 | |
0a1f5962 | 1221 | new = &rt->dst; |
14e50e57 | 1222 | new->__use = 1; |
352e512c | 1223 | new->input = dst_discard; |
aad88724 | 1224 | new->output = dst_discard_sk; |
14e50e57 | 1225 | |
0a1f5962 | 1226 | dst_copy_metrics(new, &ort->dst); |
14e50e57 DM |
1227 | rt->rt6i_idev = ort->rt6i_idev; |
1228 | if (rt->rt6i_idev) | |
1229 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1230 | |
4e3fd7a0 | 1231 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 1232 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
1233 | rt->rt6i_metric = 0; |
1234 | ||
1235 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1236 | #ifdef CONFIG_IPV6_SUBTREES | |
1237 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1238 | #endif | |
1239 | ||
1240 | dst_free(new); | |
1241 | } | |
1242 | ||
69ead7af DM |
1243 | dst_release(dst_orig); |
1244 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1245 | } |
14e50e57 | 1246 | |
1da177e4 LT |
1247 | /* |
1248 | * Destination cache support functions | |
1249 | */ | |
1250 | ||
4b32b5ad MKL |
1251 | static void rt6_dst_from_metrics_check(struct rt6_info *rt) |
1252 | { | |
1253 | if (rt->dst.from && | |
1254 | dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from)) | |
1255 | dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true); | |
1256 | } | |
1257 | ||
3da59bd9 MKL |
1258 | static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie) |
1259 | { | |
1260 | if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) | |
1261 | return NULL; | |
1262 | ||
1263 | if (rt6_check_expired(rt)) | |
1264 | return NULL; | |
1265 | ||
1266 | return &rt->dst; | |
1267 | } | |
1268 | ||
1269 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie) | |
1270 | { | |
1271 | if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
1272 | rt6_check((struct rt6_info *)(rt->dst.from), cookie)) | |
1273 | return &rt->dst; | |
1274 | else | |
1275 | return NULL; | |
1276 | } | |
1277 | ||
1da177e4 LT |
1278 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
1279 | { | |
1280 | struct rt6_info *rt; | |
1281 | ||
1282 | rt = (struct rt6_info *) dst; | |
1283 | ||
6f3118b5 ND |
1284 | /* All IPV6 dsts are created with ->obsolete set to the value |
1285 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1286 | * into this function always. | |
1287 | */ | |
e3bc10bd | 1288 | |
4b32b5ad MKL |
1289 | rt6_dst_from_metrics_check(rt); |
1290 | ||
d52d3997 | 1291 | if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE)) |
3da59bd9 MKL |
1292 | return rt6_dst_from_check(rt, cookie); |
1293 | else | |
1294 | return rt6_check(rt, cookie); | |
1da177e4 LT |
1295 | } |
1296 | ||
1297 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1298 | { | |
1299 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1300 | ||
1301 | if (rt) { | |
54c1a859 YH |
1302 | if (rt->rt6i_flags & RTF_CACHE) { |
1303 | if (rt6_check_expired(rt)) { | |
1304 | ip6_del_rt(rt); | |
1305 | dst = NULL; | |
1306 | } | |
1307 | } else { | |
1da177e4 | 1308 | dst_release(dst); |
54c1a859 YH |
1309 | dst = NULL; |
1310 | } | |
1da177e4 | 1311 | } |
54c1a859 | 1312 | return dst; |
1da177e4 LT |
1313 | } |
1314 | ||
1315 | static void ip6_link_failure(struct sk_buff *skb) | |
1316 | { | |
1317 | struct rt6_info *rt; | |
1318 | ||
3ffe533c | 1319 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1320 | |
adf30907 | 1321 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1322 | if (rt) { |
1eb4f758 HFS |
1323 | if (rt->rt6i_flags & RTF_CACHE) { |
1324 | dst_hold(&rt->dst); | |
8e3d5be7 | 1325 | ip6_del_rt(rt); |
1eb4f758 | 1326 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { |
1da177e4 | 1327 | rt->rt6i_node->fn_sernum = -1; |
1eb4f758 | 1328 | } |
1da177e4 LT |
1329 | } |
1330 | } | |
1331 | ||
45e4fd26 MKL |
1332 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
1333 | { | |
1334 | struct net *net = dev_net(rt->dst.dev); | |
1335 | ||
1336 | rt->rt6i_flags |= RTF_MODIFIED; | |
1337 | rt->rt6i_pmtu = mtu; | |
1338 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
1339 | } | |
1340 | ||
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 | |
45e4fd26 MKL |
1354 | if (rt6->rt6i_flags & RTF_CACHE) { |
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 | |
6b9ea5a6 | 1750 | int ip6_route_info_create(struct fib6_config *cfg, struct rt6_info **rt_ret) |
1da177e4 LT |
1751 | { |
1752 | int err; | |
5578689a | 1753 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1754 | struct rt6_info *rt = NULL; |
1755 | struct net_device *dev = NULL; | |
1756 | struct inet6_dev *idev = NULL; | |
c71099ac | 1757 | struct fib6_table *table; |
1da177e4 LT |
1758 | int addr_type; |
1759 | ||
86872cb5 | 1760 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1761 | return -EINVAL; |
1762 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1763 | if (cfg->fc_src_len) |
1da177e4 LT |
1764 | return -EINVAL; |
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; | |
aad88724 | 1879 | rt->dst.output = dst_discard_sk; |
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 | |
6b9ea5a6 RP |
1984 | *rt_ret = rt; |
1985 | ||
1986 | return 0; | |
1987 | out: | |
1988 | if (dev) | |
1989 | dev_put(dev); | |
1990 | if (idev) | |
1991 | in6_dev_put(idev); | |
1992 | if (rt) | |
1993 | dst_free(&rt->dst); | |
1994 | ||
1995 | *rt_ret = NULL; | |
1996 | ||
1997 | return err; | |
1998 | } | |
1999 | ||
2000 | int ip6_route_add(struct fib6_config *cfg) | |
2001 | { | |
2002 | struct mx6_config mxc = { .mx = NULL, }; | |
2003 | struct rt6_info *rt = NULL; | |
2004 | int err; | |
2005 | ||
2006 | err = ip6_route_info_create(cfg, &rt); | |
2007 | if (err) | |
2008 | goto out; | |
2009 | ||
e715b6d3 FW |
2010 | err = ip6_convert_metrics(&mxc, cfg); |
2011 | if (err) | |
2012 | goto out; | |
1da177e4 | 2013 | |
e715b6d3 FW |
2014 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc); |
2015 | ||
2016 | kfree(mxc.mx); | |
6b9ea5a6 | 2017 | |
e715b6d3 | 2018 | return err; |
1da177e4 | 2019 | out: |
1da177e4 | 2020 | if (rt) |
d8d1f30b | 2021 | dst_free(&rt->dst); |
6b9ea5a6 | 2022 | |
1da177e4 LT |
2023 | return err; |
2024 | } | |
2025 | ||
86872cb5 | 2026 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2027 | { |
2028 | int err; | |
c71099ac | 2029 | struct fib6_table *table; |
d1918542 | 2030 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 2031 | |
8e3d5be7 MKL |
2032 | if (rt == net->ipv6.ip6_null_entry || |
2033 | rt->dst.flags & DST_NOCACHE) { | |
6825a26c G |
2034 | err = -ENOENT; |
2035 | goto out; | |
2036 | } | |
6c813a72 | 2037 | |
c71099ac TG |
2038 | table = rt->rt6i_table; |
2039 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 2040 | err = fib6_del(rt, info); |
c71099ac | 2041 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 2042 | |
6825a26c | 2043 | out: |
94e187c0 | 2044 | ip6_rt_put(rt); |
1da177e4 LT |
2045 | return err; |
2046 | } | |
2047 | ||
e0a1ad73 TG |
2048 | int ip6_del_rt(struct rt6_info *rt) |
2049 | { | |
4d1169c1 | 2050 | struct nl_info info = { |
d1918542 | 2051 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 2052 | }; |
528c4ceb | 2053 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
2054 | } |
2055 | ||
86872cb5 | 2056 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 2057 | { |
c71099ac | 2058 | struct fib6_table *table; |
1da177e4 LT |
2059 | struct fib6_node *fn; |
2060 | struct rt6_info *rt; | |
2061 | int err = -ESRCH; | |
2062 | ||
5578689a | 2063 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 2064 | if (!table) |
c71099ac TG |
2065 | return err; |
2066 | ||
2067 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 2068 | |
c71099ac | 2069 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
2070 | &cfg->fc_dst, cfg->fc_dst_len, |
2071 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 2072 | |
1da177e4 | 2073 | if (fn) { |
d8d1f30b | 2074 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
1f56a01f MKL |
2075 | if ((rt->rt6i_flags & RTF_CACHE) && |
2076 | !(cfg->fc_flags & RTF_CACHE)) | |
2077 | continue; | |
86872cb5 | 2078 | if (cfg->fc_ifindex && |
d1918542 DM |
2079 | (!rt->dst.dev || |
2080 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 2081 | continue; |
86872cb5 TG |
2082 | if (cfg->fc_flags & RTF_GATEWAY && |
2083 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 2084 | continue; |
86872cb5 | 2085 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 2086 | continue; |
d8d1f30b | 2087 | dst_hold(&rt->dst); |
c71099ac | 2088 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 2089 | |
86872cb5 | 2090 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
2091 | } |
2092 | } | |
c71099ac | 2093 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2094 | |
2095 | return err; | |
2096 | } | |
2097 | ||
6700c270 | 2098 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 2099 | { |
e8599ff4 | 2100 | struct net *net = dev_net(skb->dev); |
a6279458 | 2101 | struct netevent_redirect netevent; |
e8599ff4 | 2102 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
2103 | struct ndisc_options ndopts; |
2104 | struct inet6_dev *in6_dev; | |
2105 | struct neighbour *neigh; | |
71bcdba0 | 2106 | struct rd_msg *msg; |
6e157b6a DM |
2107 | int optlen, on_link; |
2108 | u8 *lladdr; | |
e8599ff4 | 2109 | |
29a3cad5 | 2110 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 2111 | optlen -= sizeof(*msg); |
e8599ff4 DM |
2112 | |
2113 | if (optlen < 0) { | |
6e157b6a | 2114 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
2115 | return; |
2116 | } | |
2117 | ||
71bcdba0 | 2118 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 2119 | |
71bcdba0 | 2120 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 2121 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
2122 | return; |
2123 | } | |
2124 | ||
6e157b6a | 2125 | on_link = 0; |
71bcdba0 | 2126 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 2127 | on_link = 1; |
71bcdba0 | 2128 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 2129 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 2130 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
2131 | return; |
2132 | } | |
2133 | ||
2134 | in6_dev = __in6_dev_get(skb->dev); | |
2135 | if (!in6_dev) | |
2136 | return; | |
2137 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
2138 | return; | |
2139 | ||
2140 | /* RFC2461 8.1: | |
2141 | * The IP source address of the Redirect MUST be the same as the current | |
2142 | * first-hop router for the specified ICMP Destination Address. | |
2143 | */ | |
2144 | ||
71bcdba0 | 2145 | if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
2146 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
2147 | return; | |
2148 | } | |
6e157b6a DM |
2149 | |
2150 | lladdr = NULL; | |
e8599ff4 DM |
2151 | if (ndopts.nd_opts_tgt_lladdr) { |
2152 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
2153 | skb->dev); | |
2154 | if (!lladdr) { | |
2155 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
2156 | return; | |
2157 | } | |
2158 | } | |
2159 | ||
6e157b6a DM |
2160 | rt = (struct rt6_info *) dst; |
2161 | if (rt == net->ipv6.ip6_null_entry) { | |
2162 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); | |
e8599ff4 | 2163 | return; |
6e157b6a | 2164 | } |
e8599ff4 | 2165 | |
6e157b6a DM |
2166 | /* Redirect received -> path was valid. |
2167 | * Look, redirects are sent only in response to data packets, | |
2168 | * so that this nexthop apparently is reachable. --ANK | |
2169 | */ | |
2170 | dst_confirm(&rt->dst); | |
a6279458 | 2171 | |
71bcdba0 | 2172 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
2173 | if (!neigh) |
2174 | return; | |
a6279458 | 2175 | |
1da177e4 LT |
2176 | /* |
2177 | * We have finally decided to accept it. | |
2178 | */ | |
2179 | ||
1ab1457c | 2180 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
2181 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
2182 | NEIGH_UPDATE_F_OVERRIDE| | |
2183 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
2184 | NEIGH_UPDATE_F_ISROUTER)) | |
2185 | ); | |
2186 | ||
83a09abd | 2187 | nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL); |
38308473 | 2188 | if (!nrt) |
1da177e4 LT |
2189 | goto out; |
2190 | ||
2191 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
2192 | if (on_link) | |
2193 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
2194 | ||
4e3fd7a0 | 2195 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 2196 | |
40e22e8f | 2197 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
2198 | goto out; |
2199 | ||
d8d1f30b CG |
2200 | netevent.old = &rt->dst; |
2201 | netevent.new = &nrt->dst; | |
71bcdba0 | 2202 | netevent.daddr = &msg->dest; |
60592833 | 2203 | netevent.neigh = neigh; |
8d71740c TT |
2204 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
2205 | ||
38308473 | 2206 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 2207 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 2208 | ip6_del_rt(rt); |
1da177e4 LT |
2209 | } |
2210 | ||
2211 | out: | |
e8599ff4 | 2212 | neigh_release(neigh); |
6e157b6a DM |
2213 | } |
2214 | ||
1da177e4 LT |
2215 | /* |
2216 | * Misc support functions | |
2217 | */ | |
2218 | ||
4b32b5ad MKL |
2219 | static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) |
2220 | { | |
2221 | BUG_ON(from->dst.from); | |
2222 | ||
2223 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
2224 | dst_hold(&from->dst); | |
2225 | rt->dst.from = &from->dst; | |
2226 | dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true); | |
2227 | } | |
2228 | ||
83a09abd MKL |
2229 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort) |
2230 | { | |
2231 | rt->dst.input = ort->dst.input; | |
2232 | rt->dst.output = ort->dst.output; | |
2233 | rt->rt6i_dst = ort->rt6i_dst; | |
2234 | rt->dst.error = ort->dst.error; | |
2235 | rt->rt6i_idev = ort->rt6i_idev; | |
2236 | if (rt->rt6i_idev) | |
2237 | in6_dev_hold(rt->rt6i_idev); | |
2238 | rt->dst.lastuse = jiffies; | |
2239 | rt->rt6i_gateway = ort->rt6i_gateway; | |
2240 | rt->rt6i_flags = ort->rt6i_flags; | |
2241 | rt6_set_from(rt, ort); | |
2242 | rt->rt6i_metric = ort->rt6i_metric; | |
1da177e4 | 2243 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd | 2244 | rt->rt6i_src = ort->rt6i_src; |
1da177e4 | 2245 | #endif |
83a09abd MKL |
2246 | rt->rt6i_prefsrc = ort->rt6i_prefsrc; |
2247 | rt->rt6i_table = ort->rt6i_table; | |
61adedf3 | 2248 | rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate); |
1da177e4 LT |
2249 | } |
2250 | ||
70ceb4f5 | 2251 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 2252 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
2253 | const struct in6_addr *prefix, int prefixlen, |
2254 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
2255 | { |
2256 | struct fib6_node *fn; | |
2257 | struct rt6_info *rt = NULL; | |
c71099ac TG |
2258 | struct fib6_table *table; |
2259 | ||
efa2cea0 | 2260 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 2261 | if (!table) |
c71099ac | 2262 | return NULL; |
70ceb4f5 | 2263 | |
5744dd9b | 2264 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2265 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0); |
70ceb4f5 YH |
2266 | if (!fn) |
2267 | goto out; | |
2268 | ||
d8d1f30b | 2269 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2270 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
2271 | continue; |
2272 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
2273 | continue; | |
2274 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
2275 | continue; | |
d8d1f30b | 2276 | dst_hold(&rt->dst); |
70ceb4f5 YH |
2277 | break; |
2278 | } | |
2279 | out: | |
5744dd9b | 2280 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
2281 | return rt; |
2282 | } | |
2283 | ||
efa2cea0 | 2284 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
2285 | const struct in6_addr *prefix, int prefixlen, |
2286 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 2287 | unsigned int pref) |
70ceb4f5 | 2288 | { |
86872cb5 TG |
2289 | struct fib6_config cfg = { |
2290 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 2291 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2292 | .fc_ifindex = ifindex, |
2293 | .fc_dst_len = prefixlen, | |
2294 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
2295 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 2296 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
2297 | .fc_nlinfo.nlh = NULL, |
2298 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
2299 | }; |
2300 | ||
4e3fd7a0 AD |
2301 | cfg.fc_dst = *prefix; |
2302 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 2303 | |
e317da96 YH |
2304 | /* We should treat it as a default route if prefix length is 0. */ |
2305 | if (!prefixlen) | |
86872cb5 | 2306 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 2307 | |
86872cb5 | 2308 | ip6_route_add(&cfg); |
70ceb4f5 | 2309 | |
efa2cea0 | 2310 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
2311 | } |
2312 | #endif | |
2313 | ||
b71d1d42 | 2314 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 2315 | { |
1da177e4 | 2316 | struct rt6_info *rt; |
c71099ac | 2317 | struct fib6_table *table; |
1da177e4 | 2318 | |
c346dca1 | 2319 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 2320 | if (!table) |
c71099ac | 2321 | return NULL; |
1da177e4 | 2322 | |
5744dd9b | 2323 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2324 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2325 | if (dev == rt->dst.dev && |
045927ff | 2326 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
2327 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
2328 | break; | |
2329 | } | |
2330 | if (rt) | |
d8d1f30b | 2331 | dst_hold(&rt->dst); |
5744dd9b | 2332 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2333 | return rt; |
2334 | } | |
2335 | ||
b71d1d42 | 2336 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
2337 | struct net_device *dev, |
2338 | unsigned int pref) | |
1da177e4 | 2339 | { |
86872cb5 TG |
2340 | struct fib6_config cfg = { |
2341 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 2342 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2343 | .fc_ifindex = dev->ifindex, |
2344 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
2345 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 2346 | .fc_nlinfo.portid = 0, |
5578689a | 2347 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 2348 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 2349 | }; |
1da177e4 | 2350 | |
4e3fd7a0 | 2351 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 2352 | |
86872cb5 | 2353 | ip6_route_add(&cfg); |
1da177e4 | 2354 | |
1da177e4 LT |
2355 | return rt6_get_dflt_router(gwaddr, dev); |
2356 | } | |
2357 | ||
7b4da532 | 2358 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
2359 | { |
2360 | struct rt6_info *rt; | |
c71099ac TG |
2361 | struct fib6_table *table; |
2362 | ||
2363 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 2364 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 2365 | if (!table) |
c71099ac | 2366 | return; |
1da177e4 LT |
2367 | |
2368 | restart: | |
c71099ac | 2369 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 2370 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
3e8b0ac3 LC |
2371 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
2372 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d8d1f30b | 2373 | dst_hold(&rt->dst); |
c71099ac | 2374 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 2375 | ip6_del_rt(rt); |
1da177e4 LT |
2376 | goto restart; |
2377 | } | |
2378 | } | |
c71099ac | 2379 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2380 | } |
2381 | ||
5578689a DL |
2382 | static void rtmsg_to_fib6_config(struct net *net, |
2383 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
2384 | struct fib6_config *cfg) |
2385 | { | |
2386 | memset(cfg, 0, sizeof(*cfg)); | |
2387 | ||
2388 | cfg->fc_table = RT6_TABLE_MAIN; | |
2389 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
2390 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
2391 | cfg->fc_expires = rtmsg->rtmsg_info; | |
2392 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
2393 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
2394 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
2395 | ||
5578689a | 2396 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 2397 | |
4e3fd7a0 AD |
2398 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2399 | cfg->fc_src = rtmsg->rtmsg_src; | |
2400 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2401 | } |
2402 | ||
5578689a | 2403 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2404 | { |
86872cb5 | 2405 | struct fib6_config cfg; |
1da177e4 LT |
2406 | struct in6_rtmsg rtmsg; |
2407 | int err; | |
2408 | ||
67ba4152 | 2409 | switch (cmd) { |
1da177e4 LT |
2410 | case SIOCADDRT: /* Add a route */ |
2411 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 2412 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2413 | return -EPERM; |
2414 | err = copy_from_user(&rtmsg, arg, | |
2415 | sizeof(struct in6_rtmsg)); | |
2416 | if (err) | |
2417 | return -EFAULT; | |
86872cb5 | 2418 | |
5578689a | 2419 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2420 | |
1da177e4 LT |
2421 | rtnl_lock(); |
2422 | switch (cmd) { | |
2423 | case SIOCADDRT: | |
86872cb5 | 2424 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2425 | break; |
2426 | case SIOCDELRT: | |
86872cb5 | 2427 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2428 | break; |
2429 | default: | |
2430 | err = -EINVAL; | |
2431 | } | |
2432 | rtnl_unlock(); | |
2433 | ||
2434 | return err; | |
3ff50b79 | 2435 | } |
1da177e4 LT |
2436 | |
2437 | return -EINVAL; | |
2438 | } | |
2439 | ||
2440 | /* | |
2441 | * Drop the packet on the floor | |
2442 | */ | |
2443 | ||
d5fdd6ba | 2444 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2445 | { |
612f09e8 | 2446 | int type; |
adf30907 | 2447 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2448 | switch (ipstats_mib_noroutes) { |
2449 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2450 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2451 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2452 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2453 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2454 | break; |
2455 | } | |
2456 | /* FALLTHROUGH */ | |
2457 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2458 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2459 | ipstats_mib_noroutes); | |
612f09e8 YH |
2460 | break; |
2461 | } | |
3ffe533c | 2462 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2463 | kfree_skb(skb); |
2464 | return 0; | |
2465 | } | |
2466 | ||
9ce8ade0 TG |
2467 | static int ip6_pkt_discard(struct sk_buff *skb) |
2468 | { | |
612f09e8 | 2469 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2470 | } |
2471 | ||
aad88724 | 2472 | static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 2473 | { |
adf30907 | 2474 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2475 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2476 | } |
2477 | ||
9ce8ade0 TG |
2478 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2479 | { | |
612f09e8 | 2480 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2481 | } |
2482 | ||
aad88724 | 2483 | static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 2484 | { |
adf30907 | 2485 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2486 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2487 | } |
2488 | ||
1da177e4 LT |
2489 | /* |
2490 | * Allocate a dst for local (unicast / anycast) address. | |
2491 | */ | |
2492 | ||
2493 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2494 | const struct in6_addr *addr, | |
8f031519 | 2495 | bool anycast) |
1da177e4 | 2496 | { |
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; |
5578689a | 2519 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
8e3d5be7 | 2520 | rt->dst.flags |= DST_NOCACHE; |
1da177e4 | 2521 | |
d8d1f30b | 2522 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2523 | |
2524 | return rt; | |
2525 | } | |
2526 | ||
c3968a85 DW |
2527 | int ip6_route_get_saddr(struct net *net, |
2528 | struct rt6_info *rt, | |
b71d1d42 | 2529 | const struct in6_addr *daddr, |
c3968a85 DW |
2530 | unsigned int prefs, |
2531 | struct in6_addr *saddr) | |
2532 | { | |
e16e888b MS |
2533 | struct inet6_dev *idev = |
2534 | rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL; | |
c3968a85 | 2535 | int err = 0; |
e16e888b | 2536 | if (rt && rt->rt6i_prefsrc.plen) |
4e3fd7a0 | 2537 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2538 | else |
2539 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2540 | daddr, prefs, saddr); | |
2541 | return err; | |
2542 | } | |
2543 | ||
2544 | /* remove deleted ip from prefsrc entries */ | |
2545 | struct arg_dev_net_ip { | |
2546 | struct net_device *dev; | |
2547 | struct net *net; | |
2548 | struct in6_addr *addr; | |
2549 | }; | |
2550 | ||
2551 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2552 | { | |
2553 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2554 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2555 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2556 | ||
d1918542 | 2557 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2558 | rt != net->ipv6.ip6_null_entry && |
2559 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2560 | /* remove prefsrc entry */ | |
2561 | rt->rt6i_prefsrc.plen = 0; | |
2562 | } | |
2563 | return 0; | |
2564 | } | |
2565 | ||
2566 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2567 | { | |
2568 | struct net *net = dev_net(ifp->idev->dev); | |
2569 | struct arg_dev_net_ip adni = { | |
2570 | .dev = ifp->idev->dev, | |
2571 | .net = net, | |
2572 | .addr = &ifp->addr, | |
2573 | }; | |
0c3584d5 | 2574 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
2575 | } |
2576 | ||
be7a010d DJ |
2577 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) |
2578 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) | |
2579 | ||
2580 | /* Remove routers and update dst entries when gateway turn into host. */ | |
2581 | static int fib6_clean_tohost(struct rt6_info *rt, void *arg) | |
2582 | { | |
2583 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
2584 | ||
2585 | if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) || | |
2586 | ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) && | |
2587 | ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { | |
2588 | return -1; | |
2589 | } | |
2590 | return 0; | |
2591 | } | |
2592 | ||
2593 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
2594 | { | |
2595 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
2596 | } | |
2597 | ||
8ed67789 DL |
2598 | struct arg_dev_net { |
2599 | struct net_device *dev; | |
2600 | struct net *net; | |
2601 | }; | |
2602 | ||
1da177e4 LT |
2603 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2604 | { | |
bc3ef660 | 2605 | const struct arg_dev_net *adn = arg; |
2606 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2607 | |
d1918542 | 2608 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2609 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2610 | return -1; |
c159d30c | 2611 | |
1da177e4 LT |
2612 | return 0; |
2613 | } | |
2614 | ||
f3db4851 | 2615 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2616 | { |
8ed67789 DL |
2617 | struct arg_dev_net adn = { |
2618 | .dev = dev, | |
2619 | .net = net, | |
2620 | }; | |
2621 | ||
0c3584d5 | 2622 | fib6_clean_all(net, fib6_ifdown, &adn); |
1e493d19 | 2623 | icmp6_clean_all(fib6_ifdown, &adn); |
e332bc67 EB |
2624 | if (dev) |
2625 | rt6_uncached_list_flush_dev(net, dev); | |
1da177e4 LT |
2626 | } |
2627 | ||
95c96174 | 2628 | struct rt6_mtu_change_arg { |
1da177e4 | 2629 | struct net_device *dev; |
95c96174 | 2630 | unsigned int mtu; |
1da177e4 LT |
2631 | }; |
2632 | ||
2633 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2634 | { | |
2635 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2636 | struct inet6_dev *idev; | |
2637 | ||
2638 | /* In IPv6 pmtu discovery is not optional, | |
2639 | so that RTAX_MTU lock cannot disable it. | |
2640 | We still use this lock to block changes | |
2641 | caused by addrconf/ndisc. | |
2642 | */ | |
2643 | ||
2644 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2645 | if (!idev) |
1da177e4 LT |
2646 | return 0; |
2647 | ||
2648 | /* For administrative MTU increase, there is no way to discover | |
2649 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2650 | Since RFC 1981 doesn't include administrative MTU increase | |
2651 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2652 | */ | |
2653 | /* | |
2654 | If new MTU is less than route PMTU, this new MTU will be the | |
2655 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2656 | decreases; if new MTU is greater than route PMTU, and the | |
2657 | old MTU is the lowest MTU in the path, update the route PMTU | |
2658 | to reflect the increase. In this case if the other nodes' MTU | |
2659 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2660 | PMTU discouvery. | |
2661 | */ | |
d1918542 | 2662 | if (rt->dst.dev == arg->dev && |
4b32b5ad MKL |
2663 | !dst_metric_locked(&rt->dst, RTAX_MTU)) { |
2664 | if (rt->rt6i_flags & RTF_CACHE) { | |
2665 | /* For RTF_CACHE with rt6i_pmtu == 0 | |
2666 | * (i.e. a redirected route), | |
2667 | * the metrics of its rt->dst.from has already | |
2668 | * been updated. | |
2669 | */ | |
2670 | if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu) | |
2671 | rt->rt6i_pmtu = arg->mtu; | |
2672 | } else if (dst_mtu(&rt->dst) >= arg->mtu || | |
2673 | (dst_mtu(&rt->dst) < arg->mtu && | |
2674 | dst_mtu(&rt->dst) == idev->cnf.mtu6)) { | |
2675 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); | |
2676 | } | |
566cfd8f | 2677 | } |
1da177e4 LT |
2678 | return 0; |
2679 | } | |
2680 | ||
95c96174 | 2681 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2682 | { |
c71099ac TG |
2683 | struct rt6_mtu_change_arg arg = { |
2684 | .dev = dev, | |
2685 | .mtu = mtu, | |
2686 | }; | |
1da177e4 | 2687 | |
0c3584d5 | 2688 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
2689 | } |
2690 | ||
ef7c79ed | 2691 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2692 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2693 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2694 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2695 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2696 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2697 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 2698 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
2699 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
2700 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
86872cb5 TG |
2701 | }; |
2702 | ||
2703 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2704 | struct fib6_config *cfg) | |
1da177e4 | 2705 | { |
86872cb5 TG |
2706 | struct rtmsg *rtm; |
2707 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 2708 | unsigned int pref; |
86872cb5 | 2709 | int err; |
1da177e4 | 2710 | |
86872cb5 TG |
2711 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2712 | if (err < 0) | |
2713 | goto errout; | |
1da177e4 | 2714 | |
86872cb5 TG |
2715 | err = -EINVAL; |
2716 | rtm = nlmsg_data(nlh); | |
2717 | memset(cfg, 0, sizeof(*cfg)); | |
2718 | ||
2719 | cfg->fc_table = rtm->rtm_table; | |
2720 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2721 | cfg->fc_src_len = rtm->rtm_src_len; | |
2722 | cfg->fc_flags = RTF_UP; | |
2723 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2724 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2725 | |
ef2c7d7b ND |
2726 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2727 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2728 | rtm->rtm_type == RTN_PROHIBIT || |
2729 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2730 | cfg->fc_flags |= RTF_REJECT; |
2731 | ||
ab79ad14 MŻ |
2732 | if (rtm->rtm_type == RTN_LOCAL) |
2733 | cfg->fc_flags |= RTF_LOCAL; | |
2734 | ||
1f56a01f MKL |
2735 | if (rtm->rtm_flags & RTM_F_CLONED) |
2736 | cfg->fc_flags |= RTF_CACHE; | |
2737 | ||
15e47304 | 2738 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2739 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2740 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2741 | |
2742 | if (tb[RTA_GATEWAY]) { | |
67b61f6c | 2743 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 2744 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 2745 | } |
86872cb5 TG |
2746 | |
2747 | if (tb[RTA_DST]) { | |
2748 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2749 | ||
2750 | if (nla_len(tb[RTA_DST]) < plen) | |
2751 | goto errout; | |
2752 | ||
2753 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2754 | } |
86872cb5 TG |
2755 | |
2756 | if (tb[RTA_SRC]) { | |
2757 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2758 | ||
2759 | if (nla_len(tb[RTA_SRC]) < plen) | |
2760 | goto errout; | |
2761 | ||
2762 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2763 | } |
86872cb5 | 2764 | |
c3968a85 | 2765 | if (tb[RTA_PREFSRC]) |
67b61f6c | 2766 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 2767 | |
86872cb5 TG |
2768 | if (tb[RTA_OIF]) |
2769 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2770 | ||
2771 | if (tb[RTA_PRIORITY]) | |
2772 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2773 | ||
2774 | if (tb[RTA_METRICS]) { | |
2775 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2776 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2777 | } |
86872cb5 TG |
2778 | |
2779 | if (tb[RTA_TABLE]) | |
2780 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2781 | ||
51ebd318 ND |
2782 | if (tb[RTA_MULTIPATH]) { |
2783 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2784 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
2785 | } | |
2786 | ||
c78ba6d6 LR |
2787 | if (tb[RTA_PREF]) { |
2788 | pref = nla_get_u8(tb[RTA_PREF]); | |
2789 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
2790 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
2791 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
2792 | cfg->fc_flags |= RTF_PREF(pref); | |
2793 | } | |
2794 | ||
19e42e45 RP |
2795 | if (tb[RTA_ENCAP]) |
2796 | cfg->fc_encap = tb[RTA_ENCAP]; | |
2797 | ||
2798 | if (tb[RTA_ENCAP_TYPE]) | |
2799 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); | |
2800 | ||
86872cb5 TG |
2801 | err = 0; |
2802 | errout: | |
2803 | return err; | |
1da177e4 LT |
2804 | } |
2805 | ||
6b9ea5a6 RP |
2806 | struct rt6_nh { |
2807 | struct rt6_info *rt6_info; | |
2808 | struct fib6_config r_cfg; | |
2809 | struct mx6_config mxc; | |
2810 | struct list_head next; | |
2811 | }; | |
2812 | ||
2813 | static void ip6_print_replace_route_err(struct list_head *rt6_nh_list) | |
2814 | { | |
2815 | struct rt6_nh *nh; | |
2816 | ||
2817 | list_for_each_entry(nh, rt6_nh_list, next) { | |
2818 | pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n", | |
2819 | &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway, | |
2820 | nh->r_cfg.fc_ifindex); | |
2821 | } | |
2822 | } | |
2823 | ||
2824 | static int ip6_route_info_append(struct list_head *rt6_nh_list, | |
2825 | struct rt6_info *rt, struct fib6_config *r_cfg) | |
2826 | { | |
2827 | struct rt6_nh *nh; | |
2828 | struct rt6_info *rtnh; | |
2829 | int err = -EEXIST; | |
2830 | ||
2831 | list_for_each_entry(nh, rt6_nh_list, next) { | |
2832 | /* check if rt6_info already exists */ | |
2833 | rtnh = nh->rt6_info; | |
2834 | ||
2835 | if (rtnh->dst.dev == rt->dst.dev && | |
2836 | rtnh->rt6i_idev == rt->rt6i_idev && | |
2837 | ipv6_addr_equal(&rtnh->rt6i_gateway, | |
2838 | &rt->rt6i_gateway)) | |
2839 | return err; | |
2840 | } | |
2841 | ||
2842 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
2843 | if (!nh) | |
2844 | return -ENOMEM; | |
2845 | nh->rt6_info = rt; | |
2846 | err = ip6_convert_metrics(&nh->mxc, r_cfg); | |
2847 | if (err) { | |
2848 | kfree(nh); | |
2849 | return err; | |
2850 | } | |
2851 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); | |
2852 | list_add_tail(&nh->next, rt6_nh_list); | |
2853 | ||
2854 | return 0; | |
2855 | } | |
2856 | ||
2857 | static int ip6_route_multipath_add(struct fib6_config *cfg) | |
51ebd318 ND |
2858 | { |
2859 | struct fib6_config r_cfg; | |
2860 | struct rtnexthop *rtnh; | |
6b9ea5a6 RP |
2861 | struct rt6_info *rt; |
2862 | struct rt6_nh *err_nh; | |
2863 | struct rt6_nh *nh, *nh_safe; | |
51ebd318 ND |
2864 | int remaining; |
2865 | int attrlen; | |
6b9ea5a6 RP |
2866 | int err = 1; |
2867 | int nhn = 0; | |
2868 | int replace = (cfg->fc_nlinfo.nlh && | |
2869 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
2870 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 2871 | |
35f1b4e9 | 2872 | remaining = cfg->fc_mp_len; |
51ebd318 | 2873 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 2874 | |
6b9ea5a6 RP |
2875 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
2876 | * rt6_info structs per nexthop | |
2877 | */ | |
51ebd318 ND |
2878 | while (rtnh_ok(rtnh, remaining)) { |
2879 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2880 | if (rtnh->rtnh_ifindex) | |
2881 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2882 | ||
2883 | attrlen = rtnh_attrlen(rtnh); | |
2884 | if (attrlen > 0) { | |
2885 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2886 | ||
2887 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2888 | if (nla) { | |
67b61f6c | 2889 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
2890 | r_cfg.fc_flags |= RTF_GATEWAY; |
2891 | } | |
19e42e45 RP |
2892 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
2893 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
2894 | if (nla) | |
2895 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 2896 | } |
6b9ea5a6 RP |
2897 | |
2898 | err = ip6_route_info_create(&r_cfg, &rt); | |
2899 | if (err) | |
2900 | goto cleanup; | |
2901 | ||
2902 | err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg); | |
51ebd318 | 2903 | if (err) { |
6b9ea5a6 RP |
2904 | dst_free(&rt->dst); |
2905 | goto cleanup; | |
2906 | } | |
2907 | ||
2908 | rtnh = rtnh_next(rtnh, &remaining); | |
2909 | } | |
2910 | ||
2911 | err_nh = NULL; | |
2912 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
2913 | err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc); | |
2914 | /* nh->rt6_info is used or freed at this point, reset to NULL*/ | |
2915 | nh->rt6_info = NULL; | |
2916 | if (err) { | |
2917 | if (replace && nhn) | |
2918 | ip6_print_replace_route_err(&rt6_nh_list); | |
2919 | err_nh = nh; | |
2920 | goto add_errout; | |
51ebd318 | 2921 | } |
6b9ea5a6 | 2922 | |
1a72418b | 2923 | /* Because each route is added like a single route we remove |
27596472 MK |
2924 | * these flags after the first nexthop: if there is a collision, |
2925 | * we have already failed to add the first nexthop: | |
2926 | * fib6_add_rt2node() has rejected it; when replacing, old | |
2927 | * nexthops have been replaced by first new, the rest should | |
2928 | * be added to it. | |
1a72418b | 2929 | */ |
27596472 MK |
2930 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
2931 | NLM_F_REPLACE); | |
6b9ea5a6 RP |
2932 | nhn++; |
2933 | } | |
2934 | ||
2935 | goto cleanup; | |
2936 | ||
2937 | add_errout: | |
2938 | /* Delete routes that were already added */ | |
2939 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
2940 | if (err_nh == nh) | |
2941 | break; | |
2942 | ip6_route_del(&nh->r_cfg); | |
2943 | } | |
2944 | ||
2945 | cleanup: | |
2946 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
2947 | if (nh->rt6_info) | |
2948 | dst_free(&nh->rt6_info->dst); | |
52fe51f8 | 2949 | kfree(nh->mxc.mx); |
6b9ea5a6 RP |
2950 | list_del(&nh->next); |
2951 | kfree(nh); | |
2952 | } | |
2953 | ||
2954 | return err; | |
2955 | } | |
2956 | ||
2957 | static int ip6_route_multipath_del(struct fib6_config *cfg) | |
2958 | { | |
2959 | struct fib6_config r_cfg; | |
2960 | struct rtnexthop *rtnh; | |
2961 | int remaining; | |
2962 | int attrlen; | |
2963 | int err = 1, last_err = 0; | |
2964 | ||
2965 | remaining = cfg->fc_mp_len; | |
2966 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
2967 | ||
2968 | /* Parse a Multipath Entry */ | |
2969 | while (rtnh_ok(rtnh, remaining)) { | |
2970 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2971 | if (rtnh->rtnh_ifindex) | |
2972 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2973 | ||
2974 | attrlen = rtnh_attrlen(rtnh); | |
2975 | if (attrlen > 0) { | |
2976 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2977 | ||
2978 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2979 | if (nla) { | |
2980 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
2981 | r_cfg.fc_flags |= RTF_GATEWAY; | |
2982 | } | |
2983 | } | |
2984 | err = ip6_route_del(&r_cfg); | |
2985 | if (err) | |
2986 | last_err = err; | |
2987 | ||
51ebd318 ND |
2988 | rtnh = rtnh_next(rtnh, &remaining); |
2989 | } | |
2990 | ||
2991 | return last_err; | |
2992 | } | |
2993 | ||
67ba4152 | 2994 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 2995 | { |
86872cb5 TG |
2996 | struct fib6_config cfg; |
2997 | int err; | |
1da177e4 | 2998 | |
86872cb5 TG |
2999 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
3000 | if (err < 0) | |
3001 | return err; | |
3002 | ||
51ebd318 | 3003 | if (cfg.fc_mp) |
6b9ea5a6 | 3004 | return ip6_route_multipath_del(&cfg); |
51ebd318 ND |
3005 | else |
3006 | return ip6_route_del(&cfg); | |
1da177e4 LT |
3007 | } |
3008 | ||
67ba4152 | 3009 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 3010 | { |
86872cb5 TG |
3011 | struct fib6_config cfg; |
3012 | int err; | |
1da177e4 | 3013 | |
86872cb5 TG |
3014 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
3015 | if (err < 0) | |
3016 | return err; | |
3017 | ||
51ebd318 | 3018 | if (cfg.fc_mp) |
6b9ea5a6 | 3019 | return ip6_route_multipath_add(&cfg); |
51ebd318 ND |
3020 | else |
3021 | return ip6_route_add(&cfg); | |
1da177e4 LT |
3022 | } |
3023 | ||
19e42e45 | 3024 | static inline size_t rt6_nlmsg_size(struct rt6_info *rt) |
339bf98f TG |
3025 | { |
3026 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
3027 | + nla_total_size(16) /* RTA_SRC */ | |
3028 | + nla_total_size(16) /* RTA_DST */ | |
3029 | + nla_total_size(16) /* RTA_GATEWAY */ | |
3030 | + nla_total_size(16) /* RTA_PREFSRC */ | |
3031 | + nla_total_size(4) /* RTA_TABLE */ | |
3032 | + nla_total_size(4) /* RTA_IIF */ | |
3033 | + nla_total_size(4) /* RTA_OIF */ | |
3034 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 3035 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 3036 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 3037 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 3038 | + nla_total_size(1) /* RTA_PREF */ |
61adedf3 | 3039 | + lwtunnel_get_encap_size(rt->dst.lwtstate); |
339bf98f TG |
3040 | } |
3041 | ||
191cd582 BH |
3042 | static int rt6_fill_node(struct net *net, |
3043 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 3044 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 3045 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 3046 | int prefix, int nowait, unsigned int flags) |
1da177e4 | 3047 | { |
4b32b5ad | 3048 | u32 metrics[RTAX_MAX]; |
1da177e4 | 3049 | struct rtmsg *rtm; |
2d7202bf | 3050 | struct nlmsghdr *nlh; |
e3703b3d | 3051 | long expires; |
9e762a4a | 3052 | u32 table; |
1da177e4 LT |
3053 | |
3054 | if (prefix) { /* user wants prefix routes only */ | |
3055 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
3056 | /* success since this is not a prefix route */ | |
3057 | return 1; | |
3058 | } | |
3059 | } | |
3060 | ||
15e47304 | 3061 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 3062 | if (!nlh) |
26932566 | 3063 | return -EMSGSIZE; |
2d7202bf TG |
3064 | |
3065 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
3066 | rtm->rtm_family = AF_INET6; |
3067 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
3068 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
3069 | rtm->rtm_tos = 0; | |
c71099ac | 3070 | if (rt->rt6i_table) |
9e762a4a | 3071 | table = rt->rt6i_table->tb6_id; |
c71099ac | 3072 | else |
9e762a4a PM |
3073 | table = RT6_TABLE_UNSPEC; |
3074 | rtm->rtm_table = table; | |
c78679e8 DM |
3075 | if (nla_put_u32(skb, RTA_TABLE, table)) |
3076 | goto nla_put_failure; | |
ef2c7d7b ND |
3077 | if (rt->rt6i_flags & RTF_REJECT) { |
3078 | switch (rt->dst.error) { | |
3079 | case -EINVAL: | |
3080 | rtm->rtm_type = RTN_BLACKHOLE; | |
3081 | break; | |
3082 | case -EACCES: | |
3083 | rtm->rtm_type = RTN_PROHIBIT; | |
3084 | break; | |
b4949ab2 ND |
3085 | case -EAGAIN: |
3086 | rtm->rtm_type = RTN_THROW; | |
3087 | break; | |
ef2c7d7b ND |
3088 | default: |
3089 | rtm->rtm_type = RTN_UNREACHABLE; | |
3090 | break; | |
3091 | } | |
3092 | } | |
38308473 | 3093 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 3094 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 3095 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
3096 | rtm->rtm_type = RTN_LOCAL; |
3097 | else | |
3098 | rtm->rtm_type = RTN_UNICAST; | |
3099 | rtm->rtm_flags = 0; | |
35103d11 | 3100 | if (!netif_carrier_ok(rt->dst.dev)) { |
cea45e20 | 3101 | rtm->rtm_flags |= RTNH_F_LINKDOWN; |
35103d11 AG |
3102 | if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown) |
3103 | rtm->rtm_flags |= RTNH_F_DEAD; | |
3104 | } | |
1da177e4 LT |
3105 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
3106 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 3107 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 3108 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
3109 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
3110 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
3111 | rtm->rtm_protocol = RTPROT_RA; | |
3112 | else | |
3113 | rtm->rtm_protocol = RTPROT_KERNEL; | |
3114 | } | |
1da177e4 | 3115 | |
38308473 | 3116 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
3117 | rtm->rtm_flags |= RTM_F_CLONED; |
3118 | ||
3119 | if (dst) { | |
930345ea | 3120 | if (nla_put_in6_addr(skb, RTA_DST, dst)) |
c78679e8 | 3121 | goto nla_put_failure; |
1ab1457c | 3122 | rtm->rtm_dst_len = 128; |
1da177e4 | 3123 | } else if (rtm->rtm_dst_len) |
930345ea | 3124 | if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr)) |
c78679e8 | 3125 | goto nla_put_failure; |
1da177e4 LT |
3126 | #ifdef CONFIG_IPV6_SUBTREES |
3127 | if (src) { | |
930345ea | 3128 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 3129 | goto nla_put_failure; |
1ab1457c | 3130 | rtm->rtm_src_len = 128; |
c78679e8 | 3131 | } else if (rtm->rtm_src_len && |
930345ea | 3132 | nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr)) |
c78679e8 | 3133 | goto nla_put_failure; |
1da177e4 | 3134 | #endif |
7bc570c8 YH |
3135 | if (iif) { |
3136 | #ifdef CONFIG_IPV6_MROUTE | |
3137 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 3138 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
3139 | if (err <= 0) { |
3140 | if (!nowait) { | |
3141 | if (err == 0) | |
3142 | return 0; | |
3143 | goto nla_put_failure; | |
3144 | } else { | |
3145 | if (err == -EMSGSIZE) | |
3146 | goto nla_put_failure; | |
3147 | } | |
3148 | } | |
3149 | } else | |
3150 | #endif | |
c78679e8 DM |
3151 | if (nla_put_u32(skb, RTA_IIF, iif)) |
3152 | goto nla_put_failure; | |
7bc570c8 | 3153 | } else if (dst) { |
1da177e4 | 3154 | struct in6_addr saddr_buf; |
c78679e8 | 3155 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
930345ea | 3156 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3157 | goto nla_put_failure; |
1da177e4 | 3158 | } |
2d7202bf | 3159 | |
c3968a85 DW |
3160 | if (rt->rt6i_prefsrc.plen) { |
3161 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 3162 | saddr_buf = rt->rt6i_prefsrc.addr; |
930345ea | 3163 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3164 | goto nla_put_failure; |
c3968a85 DW |
3165 | } |
3166 | ||
4b32b5ad MKL |
3167 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
3168 | if (rt->rt6i_pmtu) | |
3169 | metrics[RTAX_MTU - 1] = rt->rt6i_pmtu; | |
3170 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
2d7202bf TG |
3171 | goto nla_put_failure; |
3172 | ||
dd0cbf29 | 3173 | if (rt->rt6i_flags & RTF_GATEWAY) { |
930345ea | 3174 | if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0) |
94f826b8 | 3175 | goto nla_put_failure; |
94f826b8 | 3176 | } |
2d7202bf | 3177 | |
c78679e8 DM |
3178 | if (rt->dst.dev && |
3179 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
3180 | goto nla_put_failure; | |
3181 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
3182 | goto nla_put_failure; | |
8253947e LW |
3183 | |
3184 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 3185 | |
87a50699 | 3186 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 3187 | goto nla_put_failure; |
2d7202bf | 3188 | |
c78ba6d6 LR |
3189 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags))) |
3190 | goto nla_put_failure; | |
3191 | ||
61adedf3 | 3192 | lwtunnel_fill_encap(skb, rt->dst.lwtstate); |
19e42e45 | 3193 | |
053c095a JB |
3194 | nlmsg_end(skb, nlh); |
3195 | return 0; | |
2d7202bf TG |
3196 | |
3197 | nla_put_failure: | |
26932566 PM |
3198 | nlmsg_cancel(skb, nlh); |
3199 | return -EMSGSIZE; | |
1da177e4 LT |
3200 | } |
3201 | ||
1b43af54 | 3202 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
3203 | { |
3204 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
3205 | int prefix; | |
3206 | ||
2d7202bf TG |
3207 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
3208 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
3209 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
3210 | } else | |
3211 | prefix = 0; | |
3212 | ||
191cd582 BH |
3213 | return rt6_fill_node(arg->net, |
3214 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 3215 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 3216 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
3217 | } |
3218 | ||
67ba4152 | 3219 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) |
1da177e4 | 3220 | { |
3b1e0a65 | 3221 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
3222 | struct nlattr *tb[RTA_MAX+1]; |
3223 | struct rt6_info *rt; | |
1da177e4 | 3224 | struct sk_buff *skb; |
ab364a6f | 3225 | struct rtmsg *rtm; |
4c9483b2 | 3226 | struct flowi6 fl6; |
72331bc0 | 3227 | int err, iif = 0, oif = 0; |
1da177e4 | 3228 | |
ab364a6f TG |
3229 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
3230 | if (err < 0) | |
3231 | goto errout; | |
1da177e4 | 3232 | |
ab364a6f | 3233 | err = -EINVAL; |
4c9483b2 | 3234 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 3235 | |
ab364a6f TG |
3236 | if (tb[RTA_SRC]) { |
3237 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
3238 | goto errout; | |
3239 | ||
4e3fd7a0 | 3240 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
3241 | } |
3242 | ||
3243 | if (tb[RTA_DST]) { | |
3244 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
3245 | goto errout; | |
3246 | ||
4e3fd7a0 | 3247 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
3248 | } |
3249 | ||
3250 | if (tb[RTA_IIF]) | |
3251 | iif = nla_get_u32(tb[RTA_IIF]); | |
3252 | ||
3253 | if (tb[RTA_OIF]) | |
72331bc0 | 3254 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 3255 | |
2e47b291 LC |
3256 | if (tb[RTA_MARK]) |
3257 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
3258 | ||
1da177e4 LT |
3259 | if (iif) { |
3260 | struct net_device *dev; | |
72331bc0 SL |
3261 | int flags = 0; |
3262 | ||
5578689a | 3263 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
3264 | if (!dev) { |
3265 | err = -ENODEV; | |
ab364a6f | 3266 | goto errout; |
1da177e4 | 3267 | } |
72331bc0 SL |
3268 | |
3269 | fl6.flowi6_iif = iif; | |
3270 | ||
3271 | if (!ipv6_addr_any(&fl6.saddr)) | |
3272 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3273 | ||
3274 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
3275 | flags); | |
3276 | } else { | |
3277 | fl6.flowi6_oif = oif; | |
3278 | ||
3279 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
3280 | } |
3281 | ||
ab364a6f | 3282 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 3283 | if (!skb) { |
94e187c0 | 3284 | ip6_rt_put(rt); |
ab364a6f TG |
3285 | err = -ENOBUFS; |
3286 | goto errout; | |
3287 | } | |
1da177e4 | 3288 | |
ab364a6f TG |
3289 | /* Reserve room for dummy headers, this skb can pass |
3290 | through good chunk of routing engine. | |
3291 | */ | |
459a98ed | 3292 | skb_reset_mac_header(skb); |
ab364a6f | 3293 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 3294 | |
d8d1f30b | 3295 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 3296 | |
4c9483b2 | 3297 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 3298 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 3299 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 3300 | if (err < 0) { |
ab364a6f TG |
3301 | kfree_skb(skb); |
3302 | goto errout; | |
1da177e4 LT |
3303 | } |
3304 | ||
15e47304 | 3305 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 3306 | errout: |
1da177e4 | 3307 | return err; |
1da177e4 LT |
3308 | } |
3309 | ||
37a1d361 RP |
3310 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info, |
3311 | unsigned int nlm_flags) | |
1da177e4 LT |
3312 | { |
3313 | struct sk_buff *skb; | |
5578689a | 3314 | struct net *net = info->nl_net; |
528c4ceb DL |
3315 | u32 seq; |
3316 | int err; | |
3317 | ||
3318 | err = -ENOBUFS; | |
38308473 | 3319 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 3320 | |
19e42e45 | 3321 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 3322 | if (!skb) |
21713ebc TG |
3323 | goto errout; |
3324 | ||
191cd582 | 3325 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
37a1d361 | 3326 | event, info->portid, seq, 0, 0, nlm_flags); |
26932566 PM |
3327 | if (err < 0) { |
3328 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
3329 | WARN_ON(err == -EMSGSIZE); | |
3330 | kfree_skb(skb); | |
3331 | goto errout; | |
3332 | } | |
15e47304 | 3333 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
3334 | info->nlh, gfp_any()); |
3335 | return; | |
21713ebc TG |
3336 | errout: |
3337 | if (err < 0) | |
5578689a | 3338 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
3339 | } |
3340 | ||
8ed67789 | 3341 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 3342 | unsigned long event, void *ptr) |
8ed67789 | 3343 | { |
351638e7 | 3344 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3345 | struct net *net = dev_net(dev); |
8ed67789 DL |
3346 | |
3347 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 3348 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
3349 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
3350 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3351 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 3352 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 3353 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
3354 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
3355 | #endif | |
3356 | } | |
3357 | ||
3358 | return NOTIFY_OK; | |
3359 | } | |
3360 | ||
1da177e4 LT |
3361 | /* |
3362 | * /proc | |
3363 | */ | |
3364 | ||
3365 | #ifdef CONFIG_PROC_FS | |
3366 | ||
33120b30 AD |
3367 | static const struct file_operations ipv6_route_proc_fops = { |
3368 | .owner = THIS_MODULE, | |
3369 | .open = ipv6_route_open, | |
3370 | .read = seq_read, | |
3371 | .llseek = seq_lseek, | |
8d2ca1d7 | 3372 | .release = seq_release_net, |
33120b30 AD |
3373 | }; |
3374 | ||
1da177e4 LT |
3375 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
3376 | { | |
69ddb805 | 3377 | struct net *net = (struct net *)seq->private; |
1da177e4 | 3378 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
3379 | net->ipv6.rt6_stats->fib_nodes, |
3380 | net->ipv6.rt6_stats->fib_route_nodes, | |
3381 | net->ipv6.rt6_stats->fib_rt_alloc, | |
3382 | net->ipv6.rt6_stats->fib_rt_entries, | |
3383 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 3384 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 3385 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
3386 | |
3387 | return 0; | |
3388 | } | |
3389 | ||
3390 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
3391 | { | |
de05c557 | 3392 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
3393 | } |
3394 | ||
9a32144e | 3395 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
3396 | .owner = THIS_MODULE, |
3397 | .open = rt6_stats_seq_open, | |
3398 | .read = seq_read, | |
3399 | .llseek = seq_lseek, | |
b6fcbdb4 | 3400 | .release = single_release_net, |
1da177e4 LT |
3401 | }; |
3402 | #endif /* CONFIG_PROC_FS */ | |
3403 | ||
3404 | #ifdef CONFIG_SYSCTL | |
3405 | ||
1da177e4 | 3406 | static |
fe2c6338 | 3407 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
3408 | void __user *buffer, size_t *lenp, loff_t *ppos) |
3409 | { | |
c486da34 LAG |
3410 | struct net *net; |
3411 | int delay; | |
3412 | if (!write) | |
1da177e4 | 3413 | return -EINVAL; |
c486da34 LAG |
3414 | |
3415 | net = (struct net *)ctl->extra1; | |
3416 | delay = net->ipv6.sysctl.flush_delay; | |
3417 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 3418 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 3419 | return 0; |
1da177e4 LT |
3420 | } |
3421 | ||
fe2c6338 | 3422 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 3423 | { |
1da177e4 | 3424 | .procname = "flush", |
4990509f | 3425 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 3426 | .maxlen = sizeof(int), |
89c8b3a1 | 3427 | .mode = 0200, |
6d9f239a | 3428 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
3429 | }, |
3430 | { | |
1da177e4 | 3431 | .procname = "gc_thresh", |
9a7ec3a9 | 3432 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
3433 | .maxlen = sizeof(int), |
3434 | .mode = 0644, | |
6d9f239a | 3435 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3436 | }, |
3437 | { | |
1da177e4 | 3438 | .procname = "max_size", |
4990509f | 3439 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
3440 | .maxlen = sizeof(int), |
3441 | .mode = 0644, | |
6d9f239a | 3442 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3443 | }, |
3444 | { | |
1da177e4 | 3445 | .procname = "gc_min_interval", |
4990509f | 3446 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3447 | .maxlen = sizeof(int), |
3448 | .mode = 0644, | |
6d9f239a | 3449 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3450 | }, |
3451 | { | |
1da177e4 | 3452 | .procname = "gc_timeout", |
4990509f | 3453 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
3454 | .maxlen = sizeof(int), |
3455 | .mode = 0644, | |
6d9f239a | 3456 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3457 | }, |
3458 | { | |
1da177e4 | 3459 | .procname = "gc_interval", |
4990509f | 3460 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
3461 | .maxlen = sizeof(int), |
3462 | .mode = 0644, | |
6d9f239a | 3463 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3464 | }, |
3465 | { | |
1da177e4 | 3466 | .procname = "gc_elasticity", |
4990509f | 3467 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
3468 | .maxlen = sizeof(int), |
3469 | .mode = 0644, | |
f3d3f616 | 3470 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3471 | }, |
3472 | { | |
1da177e4 | 3473 | .procname = "mtu_expires", |
4990509f | 3474 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
3475 | .maxlen = sizeof(int), |
3476 | .mode = 0644, | |
6d9f239a | 3477 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3478 | }, |
3479 | { | |
1da177e4 | 3480 | .procname = "min_adv_mss", |
4990509f | 3481 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
3482 | .maxlen = sizeof(int), |
3483 | .mode = 0644, | |
f3d3f616 | 3484 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3485 | }, |
3486 | { | |
1da177e4 | 3487 | .procname = "gc_min_interval_ms", |
4990509f | 3488 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3489 | .maxlen = sizeof(int), |
3490 | .mode = 0644, | |
6d9f239a | 3491 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 3492 | }, |
f8572d8f | 3493 | { } |
1da177e4 LT |
3494 | }; |
3495 | ||
2c8c1e72 | 3496 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
3497 | { |
3498 | struct ctl_table *table; | |
3499 | ||
3500 | table = kmemdup(ipv6_route_table_template, | |
3501 | sizeof(ipv6_route_table_template), | |
3502 | GFP_KERNEL); | |
5ee09105 YH |
3503 | |
3504 | if (table) { | |
3505 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 3506 | table[0].extra1 = net; |
86393e52 | 3507 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
3508 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
3509 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
3510 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3511 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
3512 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3513 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
3514 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 3515 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
3516 | |
3517 | /* Don't export sysctls to unprivileged users */ | |
3518 | if (net->user_ns != &init_user_ns) | |
3519 | table[0].procname = NULL; | |
5ee09105 YH |
3520 | } |
3521 | ||
760f2d01 DL |
3522 | return table; |
3523 | } | |
1da177e4 LT |
3524 | #endif |
3525 | ||
2c8c1e72 | 3526 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 3527 | { |
633d424b | 3528 | int ret = -ENOMEM; |
8ed67789 | 3529 | |
86393e52 AD |
3530 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
3531 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 3532 | |
fc66f95c ED |
3533 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
3534 | goto out_ip6_dst_ops; | |
3535 | ||
8ed67789 DL |
3536 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
3537 | sizeof(*net->ipv6.ip6_null_entry), | |
3538 | GFP_KERNEL); | |
3539 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 3540 | goto out_ip6_dst_entries; |
d8d1f30b | 3541 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 3542 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 3543 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3544 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
3545 | ip6_template_metrics, true); | |
8ed67789 DL |
3546 | |
3547 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3548 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
3549 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
3550 | GFP_KERNEL); | |
68fffc67 PZ |
3551 | if (!net->ipv6.ip6_prohibit_entry) |
3552 | goto out_ip6_null_entry; | |
d8d1f30b | 3553 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 3554 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 3555 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3556 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
3557 | ip6_template_metrics, true); | |
8ed67789 DL |
3558 | |
3559 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
3560 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
3561 | GFP_KERNEL); | |
68fffc67 PZ |
3562 | if (!net->ipv6.ip6_blk_hole_entry) |
3563 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 3564 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 3565 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 3566 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3567 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
3568 | ip6_template_metrics, true); | |
8ed67789 DL |
3569 | #endif |
3570 | ||
b339a47c PZ |
3571 | net->ipv6.sysctl.flush_delay = 0; |
3572 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3573 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3574 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3575 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3576 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
3577 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
3578 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
3579 | ||
6891a346 BT |
3580 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
3581 | ||
8ed67789 DL |
3582 | ret = 0; |
3583 | out: | |
3584 | return ret; | |
f2fc6a54 | 3585 | |
68fffc67 PZ |
3586 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
3587 | out_ip6_prohibit_entry: | |
3588 | kfree(net->ipv6.ip6_prohibit_entry); | |
3589 | out_ip6_null_entry: | |
3590 | kfree(net->ipv6.ip6_null_entry); | |
3591 | #endif | |
fc66f95c ED |
3592 | out_ip6_dst_entries: |
3593 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3594 | out_ip6_dst_ops: |
f2fc6a54 | 3595 | goto out; |
cdb18761 DL |
3596 | } |
3597 | ||
2c8c1e72 | 3598 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3599 | { |
8ed67789 DL |
3600 | kfree(net->ipv6.ip6_null_entry); |
3601 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3602 | kfree(net->ipv6.ip6_prohibit_entry); | |
3603 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3604 | #endif | |
41bb78b4 | 3605 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3606 | } |
3607 | ||
d189634e TG |
3608 | static int __net_init ip6_route_net_init_late(struct net *net) |
3609 | { | |
3610 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
3611 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
3612 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3613 | #endif |
3614 | return 0; | |
3615 | } | |
3616 | ||
3617 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3618 | { | |
3619 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3620 | remove_proc_entry("ipv6_route", net->proc_net); |
3621 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3622 | #endif |
3623 | } | |
3624 | ||
cdb18761 DL |
3625 | static struct pernet_operations ip6_route_net_ops = { |
3626 | .init = ip6_route_net_init, | |
3627 | .exit = ip6_route_net_exit, | |
3628 | }; | |
3629 | ||
c3426b47 DM |
3630 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3631 | { | |
3632 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3633 | ||
3634 | if (!bp) | |
3635 | return -ENOMEM; | |
3636 | inet_peer_base_init(bp); | |
3637 | net->ipv6.peers = bp; | |
3638 | return 0; | |
3639 | } | |
3640 | ||
3641 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3642 | { | |
3643 | struct inet_peer_base *bp = net->ipv6.peers; | |
3644 | ||
3645 | net->ipv6.peers = NULL; | |
56a6b248 | 3646 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3647 | kfree(bp); |
3648 | } | |
3649 | ||
2b823f72 | 3650 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3651 | .init = ipv6_inetpeer_init, |
3652 | .exit = ipv6_inetpeer_exit, | |
3653 | }; | |
3654 | ||
d189634e TG |
3655 | static struct pernet_operations ip6_route_net_late_ops = { |
3656 | .init = ip6_route_net_init_late, | |
3657 | .exit = ip6_route_net_exit_late, | |
3658 | }; | |
3659 | ||
8ed67789 DL |
3660 | static struct notifier_block ip6_route_dev_notifier = { |
3661 | .notifier_call = ip6_route_dev_notify, | |
3662 | .priority = 0, | |
3663 | }; | |
3664 | ||
433d49c3 | 3665 | int __init ip6_route_init(void) |
1da177e4 | 3666 | { |
433d49c3 | 3667 | int ret; |
8d0b94af | 3668 | int cpu; |
433d49c3 | 3669 | |
9a7ec3a9 DL |
3670 | ret = -ENOMEM; |
3671 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3672 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3673 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3674 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3675 | goto out; |
14e50e57 | 3676 | |
fc66f95c | 3677 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3678 | if (ret) |
bdb3289f | 3679 | goto out_kmem_cache; |
bdb3289f | 3680 | |
c3426b47 DM |
3681 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3682 | if (ret) | |
e8803b6c | 3683 | goto out_dst_entries; |
2a0c451a | 3684 | |
7e52b33b DM |
3685 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3686 | if (ret) | |
3687 | goto out_register_inetpeer; | |
c3426b47 | 3688 | |
5dc121e9 AE |
3689 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3690 | ||
8ed67789 DL |
3691 | /* Registering of the loopback is done before this portion of code, |
3692 | * the loopback reference in rt6_info will not be taken, do it | |
3693 | * manually for init_net */ | |
d8d1f30b | 3694 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3695 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3696 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3697 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3698 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3699 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3700 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3701 | #endif | |
e8803b6c | 3702 | ret = fib6_init(); |
433d49c3 | 3703 | if (ret) |
8ed67789 | 3704 | goto out_register_subsys; |
433d49c3 | 3705 | |
433d49c3 DL |
3706 | ret = xfrm6_init(); |
3707 | if (ret) | |
e8803b6c | 3708 | goto out_fib6_init; |
c35b7e72 | 3709 | |
433d49c3 DL |
3710 | ret = fib6_rules_init(); |
3711 | if (ret) | |
3712 | goto xfrm6_init; | |
7e5449c2 | 3713 | |
d189634e TG |
3714 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3715 | if (ret) | |
3716 | goto fib6_rules_init; | |
3717 | ||
433d49c3 | 3718 | ret = -ENOBUFS; |
c7ac8679 GR |
3719 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3720 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3721 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3722 | goto out_register_late_subsys; |
c127ea2c | 3723 | |
8ed67789 | 3724 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3725 | if (ret) |
d189634e | 3726 | goto out_register_late_subsys; |
8ed67789 | 3727 | |
8d0b94af MKL |
3728 | for_each_possible_cpu(cpu) { |
3729 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
3730 | ||
3731 | INIT_LIST_HEAD(&ul->head); | |
3732 | spin_lock_init(&ul->lock); | |
3733 | } | |
3734 | ||
433d49c3 DL |
3735 | out: |
3736 | return ret; | |
3737 | ||
d189634e TG |
3738 | out_register_late_subsys: |
3739 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3740 | fib6_rules_init: |
433d49c3 DL |
3741 | fib6_rules_cleanup(); |
3742 | xfrm6_init: | |
433d49c3 | 3743 | xfrm6_fini(); |
2a0c451a TG |
3744 | out_fib6_init: |
3745 | fib6_gc_cleanup(); | |
8ed67789 DL |
3746 | out_register_subsys: |
3747 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3748 | out_register_inetpeer: |
3749 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3750 | out_dst_entries: |
3751 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3752 | out_kmem_cache: |
f2fc6a54 | 3753 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3754 | goto out; |
1da177e4 LT |
3755 | } |
3756 | ||
3757 | void ip6_route_cleanup(void) | |
3758 | { | |
8ed67789 | 3759 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3760 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3761 | fib6_rules_cleanup(); |
1da177e4 | 3762 | xfrm6_fini(); |
1da177e4 | 3763 | fib6_gc_cleanup(); |
c3426b47 | 3764 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3765 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3766 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3767 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3768 | } |