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> | |
57 | #include <net/xfrm.h> | |
8d71740c | 58 | #include <net/netevent.h> |
21713ebc | 59 | #include <net/netlink.h> |
51ebd318 | 60 | #include <net/nexthop.h> |
1da177e4 LT |
61 | |
62 | #include <asm/uaccess.h> | |
63 | ||
64 | #ifdef CONFIG_SYSCTL | |
65 | #include <linux/sysctl.h> | |
66 | #endif | |
67 | ||
afc154e9 | 68 | enum rt6_nud_state { |
7e980569 JB |
69 | RT6_NUD_FAIL_HARD = -3, |
70 | RT6_NUD_FAIL_PROBE = -2, | |
71 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
72 | RT6_NUD_SUCCEED = 1 |
73 | }; | |
74 | ||
1716a961 | 75 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 76 | const struct in6_addr *dest); |
1da177e4 | 77 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 78 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 79 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
80 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
81 | static void ip6_dst_destroy(struct dst_entry *); | |
82 | static void ip6_dst_ifdown(struct dst_entry *, | |
83 | struct net_device *dev, int how); | |
569d3645 | 84 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
85 | |
86 | static int ip6_pkt_discard(struct sk_buff *skb); | |
aad88724 | 87 | static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb); |
7150aede | 88 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
aad88724 | 89 | static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 90 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
91 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
92 | struct sk_buff *skb, u32 mtu); | |
93 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
94 | struct sk_buff *skb); | |
52bd4c0c | 95 | static int rt6_score_route(struct rt6_info *rt, int oif, int strict); |
1da177e4 | 96 | |
70ceb4f5 | 97 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 98 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
99 | const struct in6_addr *prefix, int prefixlen, |
100 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 101 | unsigned int pref); |
efa2cea0 | 102 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
103 | const struct in6_addr *prefix, int prefixlen, |
104 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
105 | #endif |
106 | ||
e8243534 | 107 | static void rt6_bind_peer(struct rt6_info *rt, int create) |
108 | { | |
109 | struct inet_peer_base *base; | |
110 | struct inet_peer *peer; | |
111 | ||
112 | base = inetpeer_base_ptr(rt->_rt6i_peer); | |
113 | if (!base) | |
114 | return; | |
115 | ||
116 | peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create); | |
117 | if (peer) { | |
118 | if (!rt6_set_peer(rt, peer)) | |
119 | inet_putpeer(peer); | |
120 | } | |
121 | } | |
122 | ||
123 | static struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create) | |
124 | { | |
125 | if (rt6_has_peer(rt)) | |
126 | return rt6_peer_ptr(rt); | |
127 | ||
128 | rt6_bind_peer(rt, create); | |
129 | return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL); | |
130 | } | |
131 | ||
132 | static struct inet_peer *rt6_get_peer_create(struct rt6_info *rt) | |
133 | { | |
134 | return __rt6_get_peer(rt, 1); | |
135 | } | |
136 | ||
06582540 DM |
137 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
138 | { | |
139 | struct rt6_info *rt = (struct rt6_info *) dst; | |
140 | struct inet_peer *peer; | |
141 | u32 *p = NULL; | |
142 | ||
8e2ec639 | 143 | if (!(rt->dst.flags & DST_HOST)) |
3b471175 | 144 | return dst_cow_metrics_generic(dst, old); |
8e2ec639 | 145 | |
fbfe95a4 | 146 | peer = rt6_get_peer_create(rt); |
06582540 DM |
147 | if (peer) { |
148 | u32 *old_p = __DST_METRICS_PTR(old); | |
149 | unsigned long prev, new; | |
150 | ||
151 | p = peer->metrics; | |
e5fd387a MK |
152 | if (inet_metrics_new(peer) || |
153 | (old & DST_METRICS_FORCE_OVERWRITE)) | |
06582540 DM |
154 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); |
155 | ||
156 | new = (unsigned long) p; | |
157 | prev = cmpxchg(&dst->_metrics, old, new); | |
158 | ||
159 | if (prev != old) { | |
160 | p = __DST_METRICS_PTR(prev); | |
161 | if (prev & DST_METRICS_READ_ONLY) | |
162 | p = NULL; | |
163 | } | |
164 | } | |
165 | return p; | |
166 | } | |
167 | ||
f894cbf8 DM |
168 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
169 | struct sk_buff *skb, | |
170 | const void *daddr) | |
39232973 DM |
171 | { |
172 | struct in6_addr *p = &rt->rt6i_gateway; | |
173 | ||
a7563f34 | 174 | if (!ipv6_addr_any(p)) |
39232973 | 175 | return (const void *) p; |
f894cbf8 DM |
176 | else if (skb) |
177 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
178 | return daddr; |
179 | } | |
180 | ||
f894cbf8 DM |
181 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
182 | struct sk_buff *skb, | |
183 | const void *daddr) | |
d3aaeb38 | 184 | { |
39232973 DM |
185 | struct rt6_info *rt = (struct rt6_info *) dst; |
186 | struct neighbour *n; | |
187 | ||
f894cbf8 | 188 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 189 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
190 | if (n) |
191 | return n; | |
192 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
193 | } | |
194 | ||
9a7ec3a9 | 195 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 196 | .family = AF_INET6, |
09640e63 | 197 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
198 | .gc = ip6_dst_gc, |
199 | .gc_thresh = 1024, | |
200 | .check = ip6_dst_check, | |
0dbaee3b | 201 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 202 | .mtu = ip6_mtu, |
06582540 | 203 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
204 | .destroy = ip6_dst_destroy, |
205 | .ifdown = ip6_dst_ifdown, | |
206 | .negative_advice = ip6_negative_advice, | |
207 | .link_failure = ip6_link_failure, | |
208 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 209 | .redirect = rt6_do_redirect, |
1ac06e03 | 210 | .local_out = __ip6_local_out, |
d3aaeb38 | 211 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
212 | }; |
213 | ||
ebb762f2 | 214 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 215 | { |
618f9bc7 SK |
216 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
217 | ||
218 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
219 | } |
220 | ||
6700c270 DM |
221 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
222 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
223 | { |
224 | } | |
225 | ||
6700c270 DM |
226 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
227 | struct sk_buff *skb) | |
b587ee3b DM |
228 | { |
229 | } | |
230 | ||
0972ddb2 HB |
231 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
232 | unsigned long old) | |
233 | { | |
234 | return NULL; | |
235 | } | |
236 | ||
14e50e57 DM |
237 | static struct dst_ops ip6_dst_blackhole_ops = { |
238 | .family = AF_INET6, | |
09640e63 | 239 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
240 | .destroy = ip6_dst_destroy, |
241 | .check = ip6_dst_check, | |
ebb762f2 | 242 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 243 | .default_advmss = ip6_default_advmss, |
14e50e57 | 244 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 245 | .redirect = ip6_rt_blackhole_redirect, |
0972ddb2 | 246 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 247 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
248 | }; |
249 | ||
62fa8a84 | 250 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 251 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
252 | }; |
253 | ||
fb0af4c7 | 254 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
255 | .dst = { |
256 | .__refcnt = ATOMIC_INIT(1), | |
257 | .__use = 1, | |
2c20cbd7 | 258 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 259 | .error = -ENETUNREACH, |
d8d1f30b CG |
260 | .input = ip6_pkt_discard, |
261 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
262 | }, |
263 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 264 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
265 | .rt6i_metric = ~(u32) 0, |
266 | .rt6i_ref = ATOMIC_INIT(1), | |
267 | }; | |
268 | ||
101367c2 TG |
269 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
270 | ||
fb0af4c7 | 271 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
272 | .dst = { |
273 | .__refcnt = ATOMIC_INIT(1), | |
274 | .__use = 1, | |
2c20cbd7 | 275 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 276 | .error = -EACCES, |
d8d1f30b CG |
277 | .input = ip6_pkt_prohibit, |
278 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
279 | }, |
280 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 281 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
282 | .rt6i_metric = ~(u32) 0, |
283 | .rt6i_ref = ATOMIC_INIT(1), | |
284 | }; | |
285 | ||
fb0af4c7 | 286 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
287 | .dst = { |
288 | .__refcnt = ATOMIC_INIT(1), | |
289 | .__use = 1, | |
2c20cbd7 | 290 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 291 | .error = -EINVAL, |
d8d1f30b | 292 | .input = dst_discard, |
aad88724 | 293 | .output = dst_discard_sk, |
101367c2 TG |
294 | }, |
295 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 296 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
297 | .rt6i_metric = ~(u32) 0, |
298 | .rt6i_ref = ATOMIC_INIT(1), | |
299 | }; | |
300 | ||
301 | #endif | |
302 | ||
1da177e4 | 303 | /* allocate dst with ip6_dst_ops */ |
97bab73f | 304 | static inline struct rt6_info *ip6_dst_alloc(struct net *net, |
957c665f | 305 | struct net_device *dev, |
8b96d22d DM |
306 | int flags, |
307 | struct fib6_table *table) | |
1da177e4 | 308 | { |
97bab73f | 309 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 310 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 311 | |
97bab73f | 312 | if (rt) { |
8104891b SK |
313 | struct dst_entry *dst = &rt->dst; |
314 | ||
315 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
8b96d22d | 316 | rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers); |
51ebd318 | 317 | INIT_LIST_HEAD(&rt->rt6i_siblings); |
97bab73f | 318 | } |
cf911662 | 319 | return rt; |
1da177e4 LT |
320 | } |
321 | ||
322 | static void ip6_dst_destroy(struct dst_entry *dst) | |
323 | { | |
324 | struct rt6_info *rt = (struct rt6_info *)dst; | |
325 | struct inet6_dev *idev = rt->rt6i_idev; | |
ecd98837 | 326 | struct dst_entry *from = dst->from; |
1da177e4 | 327 | |
8e2ec639 YZ |
328 | if (!(rt->dst.flags & DST_HOST)) |
329 | dst_destroy_metrics_generic(dst); | |
330 | ||
38308473 | 331 | if (idev) { |
1da177e4 LT |
332 | rt->rt6i_idev = NULL; |
333 | in6_dev_put(idev); | |
1ab1457c | 334 | } |
1716a961 | 335 | |
ecd98837 YH |
336 | dst->from = NULL; |
337 | dst_release(from); | |
1716a961 | 338 | |
97bab73f DM |
339 | if (rt6_has_peer(rt)) { |
340 | struct inet_peer *peer = rt6_peer_ptr(rt); | |
b3419363 DM |
341 | inet_putpeer(peer); |
342 | } | |
343 | } | |
344 | ||
1da177e4 LT |
345 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
346 | int how) | |
347 | { | |
348 | struct rt6_info *rt = (struct rt6_info *)dst; | |
349 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 350 | struct net_device *loopback_dev = |
c346dca1 | 351 | dev_net(dev)->loopback_dev; |
1da177e4 | 352 | |
97cac082 DM |
353 | if (dev != loopback_dev) { |
354 | if (idev && idev->dev == dev) { | |
355 | struct inet6_dev *loopback_idev = | |
356 | in6_dev_get(loopback_dev); | |
357 | if (loopback_idev) { | |
358 | rt->rt6i_idev = loopback_idev; | |
359 | in6_dev_put(idev); | |
360 | } | |
361 | } | |
1da177e4 LT |
362 | } |
363 | } | |
364 | ||
a50feda5 | 365 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 366 | { |
1716a961 G |
367 | if (rt->rt6i_flags & RTF_EXPIRES) { |
368 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 369 | return true; |
1716a961 | 370 | } else if (rt->dst.from) { |
3fd91fb3 | 371 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 372 | } |
a50feda5 | 373 | return false; |
1da177e4 LT |
374 | } |
375 | ||
51ebd318 ND |
376 | /* Multipath route selection: |
377 | * Hash based function using packet header and flowlabel. | |
378 | * Adapted from fib_info_hashfn() | |
379 | */ | |
380 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
381 | const struct flowi6 *fl6) | |
382 | { | |
383 | unsigned int val = fl6->flowi6_proto; | |
384 | ||
c08977bb YH |
385 | val ^= ipv6_addr_hash(&fl6->daddr); |
386 | val ^= ipv6_addr_hash(&fl6->saddr); | |
51ebd318 ND |
387 | |
388 | /* Work only if this not encapsulated */ | |
389 | switch (fl6->flowi6_proto) { | |
390 | case IPPROTO_UDP: | |
391 | case IPPROTO_TCP: | |
392 | case IPPROTO_SCTP: | |
b3ce5ae1 ND |
393 | val ^= (__force u16)fl6->fl6_sport; |
394 | val ^= (__force u16)fl6->fl6_dport; | |
51ebd318 ND |
395 | break; |
396 | ||
397 | case IPPROTO_ICMPV6: | |
b3ce5ae1 ND |
398 | val ^= (__force u16)fl6->fl6_icmp_type; |
399 | val ^= (__force u16)fl6->fl6_icmp_code; | |
51ebd318 ND |
400 | break; |
401 | } | |
402 | /* RFC6438 recommands to use flowlabel */ | |
b3ce5ae1 | 403 | val ^= (__force u32)fl6->flowlabel; |
51ebd318 ND |
404 | |
405 | /* Perhaps, we need to tune, this function? */ | |
406 | val = val ^ (val >> 7) ^ (val >> 12); | |
407 | return val % candidate_count; | |
408 | } | |
409 | ||
410 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
52bd4c0c ND |
411 | struct flowi6 *fl6, int oif, |
412 | int strict) | |
51ebd318 ND |
413 | { |
414 | struct rt6_info *sibling, *next_sibling; | |
415 | int route_choosen; | |
416 | ||
417 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
418 | /* Don't change the route, if route_choosen == 0 | |
419 | * (siblings does not include ourself) | |
420 | */ | |
421 | if (route_choosen) | |
422 | list_for_each_entry_safe(sibling, next_sibling, | |
423 | &match->rt6i_siblings, rt6i_siblings) { | |
424 | route_choosen--; | |
425 | if (route_choosen == 0) { | |
52bd4c0c ND |
426 | if (rt6_score_route(sibling, oif, strict) < 0) |
427 | break; | |
51ebd318 ND |
428 | match = sibling; |
429 | break; | |
430 | } | |
431 | } | |
432 | return match; | |
433 | } | |
434 | ||
1da177e4 | 435 | /* |
c71099ac | 436 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
437 | */ |
438 | ||
8ed67789 DL |
439 | static inline struct rt6_info *rt6_device_match(struct net *net, |
440 | struct rt6_info *rt, | |
b71d1d42 | 441 | const struct in6_addr *saddr, |
1da177e4 | 442 | int oif, |
d420895e | 443 | int flags) |
1da177e4 LT |
444 | { |
445 | struct rt6_info *local = NULL; | |
446 | struct rt6_info *sprt; | |
447 | ||
dd3abc4e YH |
448 | if (!oif && ipv6_addr_any(saddr)) |
449 | goto out; | |
450 | ||
d8d1f30b | 451 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 452 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
453 | |
454 | if (oif) { | |
1da177e4 LT |
455 | if (dev->ifindex == oif) |
456 | return sprt; | |
457 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 458 | if (!sprt->rt6i_idev || |
1da177e4 | 459 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 460 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 461 | continue; |
1ab1457c | 462 | if (local && (!oif || |
1da177e4 LT |
463 | local->rt6i_idev->dev->ifindex == oif)) |
464 | continue; | |
465 | } | |
466 | local = sprt; | |
467 | } | |
dd3abc4e YH |
468 | } else { |
469 | if (ipv6_chk_addr(net, saddr, dev, | |
470 | flags & RT6_LOOKUP_F_IFACE)) | |
471 | return sprt; | |
1da177e4 | 472 | } |
dd3abc4e | 473 | } |
1da177e4 | 474 | |
dd3abc4e | 475 | if (oif) { |
1da177e4 LT |
476 | if (local) |
477 | return local; | |
478 | ||
d420895e | 479 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 480 | return net->ipv6.ip6_null_entry; |
1da177e4 | 481 | } |
dd3abc4e | 482 | out: |
1da177e4 LT |
483 | return rt; |
484 | } | |
485 | ||
27097255 | 486 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
487 | struct __rt6_probe_work { |
488 | struct work_struct work; | |
489 | struct in6_addr target; | |
490 | struct net_device *dev; | |
491 | }; | |
492 | ||
493 | static void rt6_probe_deferred(struct work_struct *w) | |
494 | { | |
495 | struct in6_addr mcaddr; | |
496 | struct __rt6_probe_work *work = | |
497 | container_of(w, struct __rt6_probe_work, work); | |
498 | ||
499 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
500 | ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL); | |
501 | dev_put(work->dev); | |
662f5533 | 502 | kfree(work); |
c2f17e82 HFS |
503 | } |
504 | ||
27097255 YH |
505 | static void rt6_probe(struct rt6_info *rt) |
506 | { | |
f2c31e32 | 507 | struct neighbour *neigh; |
27097255 YH |
508 | /* |
509 | * Okay, this does not seem to be appropriate | |
510 | * for now, however, we need to check if it | |
511 | * is really so; aka Router Reachability Probing. | |
512 | * | |
513 | * Router Reachability Probe MUST be rate-limited | |
514 | * to no more than one per minute. | |
515 | */ | |
2152caea | 516 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 517 | return; |
2152caea YH |
518 | rcu_read_lock_bh(); |
519 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
520 | if (neigh) { | |
521 | write_lock(&neigh->lock); | |
522 | if (neigh->nud_state & NUD_VALID) | |
523 | goto out; | |
7ff74a59 | 524 | } |
2152caea YH |
525 | |
526 | if (!neigh || | |
52e16356 | 527 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
c2f17e82 | 528 | struct __rt6_probe_work *work; |
27097255 | 529 | |
c2f17e82 HFS |
530 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
531 | ||
532 | if (neigh && work) | |
7e980569 | 533 | __neigh_set_probe_once(neigh); |
c2f17e82 HFS |
534 | |
535 | if (neigh) | |
2152caea YH |
536 | write_unlock(&neigh->lock); |
537 | ||
c2f17e82 HFS |
538 | if (work) { |
539 | INIT_WORK(&work->work, rt6_probe_deferred); | |
540 | work->target = rt->rt6i_gateway; | |
541 | dev_hold(rt->dst.dev); | |
542 | work->dev = rt->dst.dev; | |
543 | schedule_work(&work->work); | |
544 | } | |
f2c31e32 | 545 | } else { |
2152caea YH |
546 | out: |
547 | write_unlock(&neigh->lock); | |
f2c31e32 | 548 | } |
2152caea | 549 | rcu_read_unlock_bh(); |
27097255 YH |
550 | } |
551 | #else | |
552 | static inline void rt6_probe(struct rt6_info *rt) | |
553 | { | |
27097255 YH |
554 | } |
555 | #endif | |
556 | ||
1da177e4 | 557 | /* |
554cfb7e | 558 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 559 | */ |
b6f99a21 | 560 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 561 | { |
d1918542 | 562 | struct net_device *dev = rt->dst.dev; |
161980f4 | 563 | if (!oif || dev->ifindex == oif) |
554cfb7e | 564 | return 2; |
161980f4 DM |
565 | if ((dev->flags & IFF_LOOPBACK) && |
566 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
567 | return 1; | |
568 | return 0; | |
554cfb7e | 569 | } |
1da177e4 | 570 | |
afc154e9 | 571 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 572 | { |
f2c31e32 | 573 | struct neighbour *neigh; |
afc154e9 | 574 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 575 | |
4d0c5911 YH |
576 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
577 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 578 | return RT6_NUD_SUCCEED; |
145a3621 YH |
579 | |
580 | rcu_read_lock_bh(); | |
581 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
582 | if (neigh) { | |
583 | read_lock(&neigh->lock); | |
554cfb7e | 584 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 585 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 586 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 587 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 588 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
589 | else |
590 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 591 | #endif |
145a3621 | 592 | read_unlock(&neigh->lock); |
afc154e9 HFS |
593 | } else { |
594 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 595 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 596 | } |
145a3621 YH |
597 | rcu_read_unlock_bh(); |
598 | ||
a5a81f0b | 599 | return ret; |
1da177e4 LT |
600 | } |
601 | ||
554cfb7e YH |
602 | static int rt6_score_route(struct rt6_info *rt, int oif, |
603 | int strict) | |
1da177e4 | 604 | { |
a5a81f0b | 605 | int m; |
1ab1457c | 606 | |
4d0c5911 | 607 | m = rt6_check_dev(rt, oif); |
77d16f45 | 608 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 609 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
610 | #ifdef CONFIG_IPV6_ROUTER_PREF |
611 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
612 | #endif | |
afc154e9 HFS |
613 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
614 | int n = rt6_check_neigh(rt); | |
615 | if (n < 0) | |
616 | return n; | |
617 | } | |
554cfb7e YH |
618 | return m; |
619 | } | |
620 | ||
f11e6659 | 621 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
622 | int *mpri, struct rt6_info *match, |
623 | bool *do_rr) | |
554cfb7e | 624 | { |
f11e6659 | 625 | int m; |
afc154e9 | 626 | bool match_do_rr = false; |
f11e6659 DM |
627 | |
628 | if (rt6_check_expired(rt)) | |
629 | goto out; | |
630 | ||
631 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 632 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
633 | match_do_rr = true; |
634 | m = 0; /* lowest valid score */ | |
7e980569 | 635 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 636 | goto out; |
afc154e9 HFS |
637 | } |
638 | ||
639 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
640 | rt6_probe(rt); | |
f11e6659 | 641 | |
7e980569 | 642 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 643 | if (m > *mpri) { |
afc154e9 | 644 | *do_rr = match_do_rr; |
f11e6659 DM |
645 | *mpri = m; |
646 | match = rt; | |
f11e6659 | 647 | } |
f11e6659 DM |
648 | out: |
649 | return match; | |
650 | } | |
651 | ||
652 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
653 | struct rt6_info *rr_head, | |
afc154e9 HFS |
654 | u32 metric, int oif, int strict, |
655 | bool *do_rr) | |
f11e6659 DM |
656 | { |
657 | struct rt6_info *rt, *match; | |
554cfb7e | 658 | int mpri = -1; |
1da177e4 | 659 | |
f11e6659 DM |
660 | match = NULL; |
661 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 662 | rt = rt->dst.rt6_next) |
afc154e9 | 663 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
f11e6659 | 664 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; |
d8d1f30b | 665 | rt = rt->dst.rt6_next) |
afc154e9 | 666 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 667 | |
f11e6659 DM |
668 | return match; |
669 | } | |
1da177e4 | 670 | |
f11e6659 DM |
671 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
672 | { | |
673 | struct rt6_info *match, *rt0; | |
8ed67789 | 674 | struct net *net; |
afc154e9 | 675 | bool do_rr = false; |
1da177e4 | 676 | |
f11e6659 DM |
677 | rt0 = fn->rr_ptr; |
678 | if (!rt0) | |
679 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 680 | |
afc154e9 HFS |
681 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
682 | &do_rr); | |
1da177e4 | 683 | |
afc154e9 | 684 | if (do_rr) { |
d8d1f30b | 685 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 686 | |
554cfb7e | 687 | /* no entries matched; do round-robin */ |
f11e6659 DM |
688 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
689 | next = fn->leaf; | |
690 | ||
691 | if (next != rt0) | |
692 | fn->rr_ptr = next; | |
1da177e4 | 693 | } |
1da177e4 | 694 | |
d1918542 | 695 | net = dev_net(rt0->dst.dev); |
a02cec21 | 696 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
697 | } |
698 | ||
70ceb4f5 YH |
699 | #ifdef CONFIG_IPV6_ROUTE_INFO |
700 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 701 | const struct in6_addr *gwaddr) |
70ceb4f5 | 702 | { |
c346dca1 | 703 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
704 | struct route_info *rinfo = (struct route_info *) opt; |
705 | struct in6_addr prefix_buf, *prefix; | |
706 | unsigned int pref; | |
4bed72e4 | 707 | unsigned long lifetime; |
70ceb4f5 YH |
708 | struct rt6_info *rt; |
709 | ||
710 | if (len < sizeof(struct route_info)) { | |
711 | return -EINVAL; | |
712 | } | |
713 | ||
714 | /* Sanity check for prefix_len and length */ | |
715 | if (rinfo->length > 3) { | |
716 | return -EINVAL; | |
717 | } else if (rinfo->prefix_len > 128) { | |
718 | return -EINVAL; | |
719 | } else if (rinfo->prefix_len > 64) { | |
720 | if (rinfo->length < 2) { | |
721 | return -EINVAL; | |
722 | } | |
723 | } else if (rinfo->prefix_len > 0) { | |
724 | if (rinfo->length < 1) { | |
725 | return -EINVAL; | |
726 | } | |
727 | } | |
728 | ||
729 | pref = rinfo->route_pref; | |
730 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 731 | return -EINVAL; |
70ceb4f5 | 732 | |
4bed72e4 | 733 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
734 | |
735 | if (rinfo->length == 3) | |
736 | prefix = (struct in6_addr *)rinfo->prefix; | |
737 | else { | |
738 | /* this function is safe */ | |
739 | ipv6_addr_prefix(&prefix_buf, | |
740 | (struct in6_addr *)rinfo->prefix, | |
741 | rinfo->prefix_len); | |
742 | prefix = &prefix_buf; | |
743 | } | |
744 | ||
f104a567 DJ |
745 | if (rinfo->prefix_len == 0) |
746 | rt = rt6_get_dflt_router(gwaddr, dev); | |
747 | else | |
748 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
749 | gwaddr, dev->ifindex); | |
70ceb4f5 YH |
750 | |
751 | if (rt && !lifetime) { | |
e0a1ad73 | 752 | ip6_del_rt(rt); |
70ceb4f5 YH |
753 | rt = NULL; |
754 | } | |
755 | ||
756 | if (!rt && lifetime) | |
efa2cea0 | 757 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
758 | pref); |
759 | else if (rt) | |
760 | rt->rt6i_flags = RTF_ROUTEINFO | | |
761 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
762 | ||
763 | if (rt) { | |
1716a961 G |
764 | if (!addrconf_finite_timeout(lifetime)) |
765 | rt6_clean_expires(rt); | |
766 | else | |
767 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
768 | ||
94e187c0 | 769 | ip6_rt_put(rt); |
70ceb4f5 YH |
770 | } |
771 | return 0; | |
772 | } | |
773 | #endif | |
774 | ||
a3c00e46 MKL |
775 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
776 | struct in6_addr *saddr) | |
777 | { | |
778 | struct fib6_node *pn; | |
779 | while (1) { | |
780 | if (fn->fn_flags & RTN_TL_ROOT) | |
781 | return NULL; | |
782 | pn = fn->parent; | |
783 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) | |
784 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); | |
785 | else | |
786 | fn = pn; | |
787 | if (fn->fn_flags & RTN_RTINFO) | |
788 | return fn; | |
789 | } | |
790 | } | |
c71099ac | 791 | |
8ed67789 DL |
792 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
793 | struct fib6_table *table, | |
4c9483b2 | 794 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
795 | { |
796 | struct fib6_node *fn; | |
797 | struct rt6_info *rt; | |
798 | ||
c71099ac | 799 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 800 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
801 | restart: |
802 | rt = fn->leaf; | |
4c9483b2 | 803 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 | 804 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
52bd4c0c | 805 | rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); |
a3c00e46 MKL |
806 | if (rt == net->ipv6.ip6_null_entry) { |
807 | fn = fib6_backtrack(fn, &fl6->saddr); | |
808 | if (fn) | |
809 | goto restart; | |
810 | } | |
d8d1f30b | 811 | dst_use(&rt->dst, jiffies); |
c71099ac | 812 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
813 | return rt; |
814 | ||
815 | } | |
816 | ||
67ba4152 | 817 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
ea6e574e FW |
818 | int flags) |
819 | { | |
820 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
821 | } | |
822 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
823 | ||
9acd9f3a YH |
824 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
825 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 826 | { |
4c9483b2 DM |
827 | struct flowi6 fl6 = { |
828 | .flowi6_oif = oif, | |
829 | .daddr = *daddr, | |
c71099ac TG |
830 | }; |
831 | struct dst_entry *dst; | |
77d16f45 | 832 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 833 | |
adaa70bb | 834 | if (saddr) { |
4c9483b2 | 835 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
836 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
837 | } | |
838 | ||
4c9483b2 | 839 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
840 | if (dst->error == 0) |
841 | return (struct rt6_info *) dst; | |
842 | ||
843 | dst_release(dst); | |
844 | ||
1da177e4 LT |
845 | return NULL; |
846 | } | |
7159039a YH |
847 | EXPORT_SYMBOL(rt6_lookup); |
848 | ||
c71099ac | 849 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
850 | It takes new route entry, the addition fails by any reason the |
851 | route is freed. In any case, if caller does not hold it, it may | |
852 | be destroyed. | |
853 | */ | |
854 | ||
e5fd387a | 855 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, |
e715b6d3 | 856 | struct mx6_config *mxc) |
1da177e4 LT |
857 | { |
858 | int err; | |
c71099ac | 859 | struct fib6_table *table; |
1da177e4 | 860 | |
c71099ac TG |
861 | table = rt->rt6i_table; |
862 | write_lock_bh(&table->tb6_lock); | |
e715b6d3 | 863 | err = fib6_add(&table->tb6_root, rt, info, mxc); |
c71099ac | 864 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
865 | |
866 | return err; | |
867 | } | |
868 | ||
40e22e8f TG |
869 | int ip6_ins_rt(struct rt6_info *rt) |
870 | { | |
e715b6d3 FW |
871 | struct nl_info info = { .nl_net = dev_net(rt->dst.dev), }; |
872 | struct mx6_config mxc = { .mx = NULL, }; | |
873 | ||
874 | return __ip6_ins_rt(rt, &info, &mxc); | |
40e22e8f TG |
875 | } |
876 | ||
1716a961 | 877 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, |
21efcfa0 | 878 | const struct in6_addr *daddr, |
b71d1d42 | 879 | const struct in6_addr *saddr) |
1da177e4 | 880 | { |
1da177e4 LT |
881 | struct rt6_info *rt; |
882 | ||
883 | /* | |
884 | * Clone the route. | |
885 | */ | |
886 | ||
21efcfa0 | 887 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
888 | |
889 | if (rt) { | |
249a3630 DJ |
890 | if (ort->rt6i_dst.plen != 128 && |
891 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
892 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 893 | |
1da177e4 | 894 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
895 | |
896 | #ifdef CONFIG_IPV6_SUBTREES | |
897 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 898 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
899 | rt->rt6i_src.plen = 128; |
900 | } | |
901 | #endif | |
95a9a5ba | 902 | } |
1da177e4 | 903 | |
95a9a5ba YH |
904 | return rt; |
905 | } | |
1da177e4 | 906 | |
21efcfa0 ED |
907 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
908 | const struct in6_addr *daddr) | |
299d9939 | 909 | { |
21efcfa0 ED |
910 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
911 | ||
887c95cc | 912 | if (rt) |
299d9939 | 913 | rt->rt6i_flags |= RTF_CACHE; |
299d9939 YH |
914 | return rt; |
915 | } | |
916 | ||
8ed67789 | 917 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 918 | struct flowi6 *fl6, int flags) |
1da177e4 | 919 | { |
367efcb9 | 920 | struct fib6_node *fn, *saved_fn; |
519fbd87 | 921 | struct rt6_info *rt, *nrt; |
c71099ac | 922 | int strict = 0; |
1da177e4 | 923 | int attempts = 3; |
519fbd87 | 924 | int err; |
1da177e4 | 925 | |
77d16f45 | 926 | strict |= flags & RT6_LOOKUP_F_IFACE; |
367efcb9 MKL |
927 | if (net->ipv6.devconf_all->forwarding == 0) |
928 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1da177e4 | 929 | |
a3c00e46 | 930 | redo_fib6_lookup_lock: |
c71099ac | 931 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 932 | |
4c9483b2 | 933 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 934 | saved_fn = fn; |
1da177e4 | 935 | |
a3c00e46 | 936 | redo_rt6_select: |
367efcb9 | 937 | rt = rt6_select(fn, oif, strict); |
52bd4c0c | 938 | if (rt->rt6i_nsiblings) |
367efcb9 | 939 | rt = rt6_multipath_select(rt, fl6, oif, strict); |
a3c00e46 MKL |
940 | if (rt == net->ipv6.ip6_null_entry) { |
941 | fn = fib6_backtrack(fn, &fl6->saddr); | |
942 | if (fn) | |
943 | goto redo_rt6_select; | |
367efcb9 MKL |
944 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
945 | /* also consider unreachable route */ | |
946 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
947 | fn = saved_fn; | |
948 | goto redo_rt6_select; | |
949 | } else { | |
950 | dst_hold(&rt->dst); | |
951 | read_unlock_bh(&table->tb6_lock); | |
952 | goto out2; | |
953 | } | |
a3c00e46 MKL |
954 | } |
955 | ||
d8d1f30b | 956 | dst_hold(&rt->dst); |
c71099ac | 957 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 958 | |
94c77bb4 MKL |
959 | if (rt->rt6i_flags & RTF_CACHE) |
960 | goto out2; | |
961 | ||
c440f160 | 962 | if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY))) |
4c9483b2 | 963 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 964 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 965 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
966 | else |
967 | goto out2; | |
e40cf353 | 968 | |
94e187c0 | 969 | ip6_rt_put(rt); |
8ed67789 | 970 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 971 | |
d8d1f30b | 972 | dst_hold(&rt->dst); |
519fbd87 | 973 | if (nrt) { |
40e22e8f | 974 | err = ip6_ins_rt(nrt); |
519fbd87 | 975 | if (!err) |
1da177e4 | 976 | goto out2; |
1da177e4 | 977 | } |
1da177e4 | 978 | |
519fbd87 YH |
979 | if (--attempts <= 0) |
980 | goto out2; | |
981 | ||
982 | /* | |
c71099ac | 983 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
984 | * released someone could insert this route. Relookup. |
985 | */ | |
94e187c0 | 986 | ip6_rt_put(rt); |
a3c00e46 | 987 | goto redo_fib6_lookup_lock; |
519fbd87 | 988 | |
1da177e4 | 989 | out2: |
d8d1f30b CG |
990 | rt->dst.lastuse = jiffies; |
991 | rt->dst.__use++; | |
c71099ac TG |
992 | |
993 | return rt; | |
1da177e4 LT |
994 | } |
995 | ||
8ed67789 | 996 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 997 | struct flowi6 *fl6, int flags) |
4acad72d | 998 | { |
4c9483b2 | 999 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
1000 | } |
1001 | ||
72331bc0 SL |
1002 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
1003 | struct net_device *dev, | |
1004 | struct flowi6 *fl6, int flags) | |
1005 | { | |
1006 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1007 | flags |= RT6_LOOKUP_F_IFACE; | |
1008 | ||
1009 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1010 | } | |
1011 | ||
c71099ac TG |
1012 | void ip6_route_input(struct sk_buff *skb) |
1013 | { | |
b71d1d42 | 1014 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1015 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1016 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
1017 | struct flowi6 fl6 = { |
1018 | .flowi6_iif = skb->dev->ifindex, | |
1019 | .daddr = iph->daddr, | |
1020 | .saddr = iph->saddr, | |
6502ca52 | 1021 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1022 | .flowi6_mark = skb->mark, |
1023 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1024 | }; |
adaa70bb | 1025 | |
72331bc0 | 1026 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1027 | } |
1028 | ||
8ed67789 | 1029 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1030 | struct flowi6 *fl6, int flags) |
1da177e4 | 1031 | { |
4c9483b2 | 1032 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1033 | } |
1034 | ||
67ba4152 | 1035 | struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 1036 | struct flowi6 *fl6) |
c71099ac TG |
1037 | { |
1038 | int flags = 0; | |
1039 | ||
1fb9489b | 1040 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1041 | |
4c9483b2 | 1042 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 1043 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1044 | |
4c9483b2 | 1045 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 1046 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1047 | else if (sk) |
1048 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1049 | |
4c9483b2 | 1050 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 | 1051 | } |
7159039a | 1052 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 1053 | |
2774c131 | 1054 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1055 | { |
5c1e6aa3 | 1056 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1057 | struct dst_entry *new = NULL; |
1058 | ||
f5b0a874 | 1059 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1060 | if (rt) { |
d8d1f30b | 1061 | new = &rt->dst; |
14e50e57 | 1062 | |
8104891b SK |
1063 | memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); |
1064 | rt6_init_peer(rt, net->ipv6.peers); | |
1065 | ||
14e50e57 | 1066 | new->__use = 1; |
352e512c | 1067 | new->input = dst_discard; |
aad88724 | 1068 | new->output = dst_discard_sk; |
14e50e57 | 1069 | |
21efcfa0 ED |
1070 | if (dst_metrics_read_only(&ort->dst)) |
1071 | new->_metrics = ort->dst._metrics; | |
1072 | else | |
1073 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
1074 | rt->rt6i_idev = ort->rt6i_idev; |
1075 | if (rt->rt6i_idev) | |
1076 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1077 | |
4e3fd7a0 | 1078 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 | 1079 | rt->rt6i_flags = ort->rt6i_flags; |
14e50e57 DM |
1080 | rt->rt6i_metric = 0; |
1081 | ||
1082 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1083 | #ifdef CONFIG_IPV6_SUBTREES | |
1084 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1085 | #endif | |
1086 | ||
1087 | dst_free(new); | |
1088 | } | |
1089 | ||
69ead7af DM |
1090 | dst_release(dst_orig); |
1091 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1092 | } |
14e50e57 | 1093 | |
1da177e4 LT |
1094 | /* |
1095 | * Destination cache support functions | |
1096 | */ | |
1097 | ||
1098 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
1099 | { | |
1100 | struct rt6_info *rt; | |
1101 | ||
1102 | rt = (struct rt6_info *) dst; | |
1103 | ||
6f3118b5 ND |
1104 | /* All IPV6 dsts are created with ->obsolete set to the value |
1105 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1106 | * into this function always. | |
1107 | */ | |
e3bc10bd HFS |
1108 | if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) |
1109 | return NULL; | |
a4477c4d | 1110 | |
e3bc10bd HFS |
1111 | if (rt6_check_expired(rt)) |
1112 | return NULL; | |
1113 | ||
1114 | return dst; | |
1da177e4 LT |
1115 | } |
1116 | ||
1117 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1118 | { | |
1119 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1120 | ||
1121 | if (rt) { | |
54c1a859 YH |
1122 | if (rt->rt6i_flags & RTF_CACHE) { |
1123 | if (rt6_check_expired(rt)) { | |
1124 | ip6_del_rt(rt); | |
1125 | dst = NULL; | |
1126 | } | |
1127 | } else { | |
1da177e4 | 1128 | dst_release(dst); |
54c1a859 YH |
1129 | dst = NULL; |
1130 | } | |
1da177e4 | 1131 | } |
54c1a859 | 1132 | return dst; |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | static void ip6_link_failure(struct sk_buff *skb) | |
1136 | { | |
1137 | struct rt6_info *rt; | |
1138 | ||
3ffe533c | 1139 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1140 | |
adf30907 | 1141 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1142 | if (rt) { |
1eb4f758 HFS |
1143 | if (rt->rt6i_flags & RTF_CACHE) { |
1144 | dst_hold(&rt->dst); | |
1145 | if (ip6_del_rt(rt)) | |
1146 | dst_free(&rt->dst); | |
1147 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { | |
1da177e4 | 1148 | rt->rt6i_node->fn_sernum = -1; |
1eb4f758 | 1149 | } |
1da177e4 LT |
1150 | } |
1151 | } | |
1152 | ||
6700c270 DM |
1153 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1154 | struct sk_buff *skb, u32 mtu) | |
1da177e4 | 1155 | { |
67ba4152 | 1156 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 1157 | |
81aded24 | 1158 | dst_confirm(dst); |
1da177e4 | 1159 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { |
81aded24 DM |
1160 | struct net *net = dev_net(dst->dev); |
1161 | ||
1da177e4 | 1162 | rt6->rt6i_flags |= RTF_MODIFIED; |
9d289715 | 1163 | if (mtu < IPV6_MIN_MTU) |
1da177e4 | 1164 | mtu = IPV6_MIN_MTU; |
9d289715 | 1165 | |
defb3519 | 1166 | dst_metric_set(dst, RTAX_MTU, mtu); |
81aded24 | 1167 | rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1168 | } |
1169 | } | |
1170 | ||
42ae66c8 DM |
1171 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
1172 | int oif, u32 mark) | |
81aded24 DM |
1173 | { |
1174 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1175 | struct dst_entry *dst; | |
1176 | struct flowi6 fl6; | |
1177 | ||
1178 | memset(&fl6, 0, sizeof(fl6)); | |
1179 | fl6.flowi6_oif = oif; | |
1b3c61dc | 1180 | fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); |
81aded24 DM |
1181 | fl6.daddr = iph->daddr; |
1182 | fl6.saddr = iph->saddr; | |
6502ca52 | 1183 | fl6.flowlabel = ip6_flowinfo(iph); |
81aded24 DM |
1184 | |
1185 | dst = ip6_route_output(net, NULL, &fl6); | |
1186 | if (!dst->error) | |
6700c270 | 1187 | ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu)); |
81aded24 DM |
1188 | dst_release(dst); |
1189 | } | |
1190 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1191 | ||
1192 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1193 | { | |
1194 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
1195 | sk->sk_bound_dev_if, sk->sk_mark); | |
1196 | } | |
1197 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1198 | ||
b55b76b2 DJ |
1199 | /* Handle redirects */ |
1200 | struct ip6rd_flowi { | |
1201 | struct flowi6 fl6; | |
1202 | struct in6_addr gateway; | |
1203 | }; | |
1204 | ||
1205 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
1206 | struct fib6_table *table, | |
1207 | struct flowi6 *fl6, | |
1208 | int flags) | |
1209 | { | |
1210 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
1211 | struct rt6_info *rt; | |
1212 | struct fib6_node *fn; | |
1213 | ||
1214 | /* Get the "current" route for this destination and | |
1215 | * check if the redirect has come from approriate router. | |
1216 | * | |
1217 | * RFC 4861 specifies that redirects should only be | |
1218 | * accepted if they come from the nexthop to the target. | |
1219 | * Due to the way the routes are chosen, this notion | |
1220 | * is a bit fuzzy and one might need to check all possible | |
1221 | * routes. | |
1222 | */ | |
1223 | ||
1224 | read_lock_bh(&table->tb6_lock); | |
1225 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); | |
1226 | restart: | |
1227 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { | |
1228 | if (rt6_check_expired(rt)) | |
1229 | continue; | |
1230 | if (rt->dst.error) | |
1231 | break; | |
1232 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1233 | continue; | |
1234 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) | |
1235 | continue; | |
1236 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) | |
1237 | continue; | |
1238 | break; | |
1239 | } | |
1240 | ||
1241 | if (!rt) | |
1242 | rt = net->ipv6.ip6_null_entry; | |
1243 | else if (rt->dst.error) { | |
1244 | rt = net->ipv6.ip6_null_entry; | |
b0a1ba59 MKL |
1245 | goto out; |
1246 | } | |
1247 | ||
1248 | if (rt == net->ipv6.ip6_null_entry) { | |
a3c00e46 MKL |
1249 | fn = fib6_backtrack(fn, &fl6->saddr); |
1250 | if (fn) | |
1251 | goto restart; | |
b55b76b2 | 1252 | } |
a3c00e46 | 1253 | |
b0a1ba59 | 1254 | out: |
b55b76b2 DJ |
1255 | dst_hold(&rt->dst); |
1256 | ||
1257 | read_unlock_bh(&table->tb6_lock); | |
1258 | ||
1259 | return rt; | |
1260 | }; | |
1261 | ||
1262 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
1263 | const struct flowi6 *fl6, | |
1264 | const struct in6_addr *gateway) | |
1265 | { | |
1266 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
1267 | struct ip6rd_flowi rdfl; | |
1268 | ||
1269 | rdfl.fl6 = *fl6; | |
1270 | rdfl.gateway = *gateway; | |
1271 | ||
1272 | return fib6_rule_lookup(net, &rdfl.fl6, | |
1273 | flags, __ip6_route_redirect); | |
1274 | } | |
1275 | ||
3a5ad2ee DM |
1276 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1277 | { | |
1278 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1279 | struct dst_entry *dst; | |
1280 | struct flowi6 fl6; | |
1281 | ||
1282 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1283 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
3a5ad2ee DM |
1284 | fl6.flowi6_oif = oif; |
1285 | fl6.flowi6_mark = mark; | |
3a5ad2ee DM |
1286 | fl6.daddr = iph->daddr; |
1287 | fl6.saddr = iph->saddr; | |
6502ca52 | 1288 | fl6.flowlabel = ip6_flowinfo(iph); |
3a5ad2ee | 1289 | |
b55b76b2 DJ |
1290 | dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
1291 | rt6_do_redirect(dst, NULL, skb); | |
3a5ad2ee DM |
1292 | dst_release(dst); |
1293 | } | |
1294 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1295 | ||
c92a59ec DJ |
1296 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
1297 | u32 mark) | |
1298 | { | |
1299 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1300 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
1301 | struct dst_entry *dst; | |
1302 | struct flowi6 fl6; | |
1303 | ||
1304 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1305 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
c92a59ec DJ |
1306 | fl6.flowi6_oif = oif; |
1307 | fl6.flowi6_mark = mark; | |
c92a59ec DJ |
1308 | fl6.daddr = msg->dest; |
1309 | fl6.saddr = iph->daddr; | |
1310 | ||
b55b76b2 DJ |
1311 | dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
1312 | rt6_do_redirect(dst, NULL, skb); | |
c92a59ec DJ |
1313 | dst_release(dst); |
1314 | } | |
1315 | ||
3a5ad2ee DM |
1316 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
1317 | { | |
1318 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1319 | } | |
1320 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1321 | ||
0dbaee3b | 1322 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1323 | { |
0dbaee3b DM |
1324 | struct net_device *dev = dst->dev; |
1325 | unsigned int mtu = dst_mtu(dst); | |
1326 | struct net *net = dev_net(dev); | |
1327 | ||
1da177e4 LT |
1328 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1329 | ||
5578689a DL |
1330 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1331 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1332 | |
1333 | /* | |
1ab1457c YH |
1334 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1335 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1336 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1337 | * rely only on pmtu discovery" |
1338 | */ | |
1339 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1340 | mtu = IPV6_MAXPLEN; | |
1341 | return mtu; | |
1342 | } | |
1343 | ||
ebb762f2 | 1344 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1345 | { |
d33e4553 | 1346 | struct inet6_dev *idev; |
618f9bc7 SK |
1347 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1348 | ||
1349 | if (mtu) | |
30f78d8e | 1350 | goto out; |
618f9bc7 SK |
1351 | |
1352 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1353 | |
1354 | rcu_read_lock(); | |
1355 | idev = __in6_dev_get(dst->dev); | |
1356 | if (idev) | |
1357 | mtu = idev->cnf.mtu6; | |
1358 | rcu_read_unlock(); | |
1359 | ||
30f78d8e ED |
1360 | out: |
1361 | return min_t(unsigned int, mtu, IP6_MAX_MTU); | |
d33e4553 DM |
1362 | } |
1363 | ||
3b00944c YH |
1364 | static struct dst_entry *icmp6_dst_gc_list; |
1365 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1366 | |
3b00944c | 1367 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1368 | struct flowi6 *fl6) |
1da177e4 | 1369 | { |
87a11578 | 1370 | struct dst_entry *dst; |
1da177e4 LT |
1371 | struct rt6_info *rt; |
1372 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1373 | struct net *net = dev_net(dev); |
1da177e4 | 1374 | |
38308473 | 1375 | if (unlikely(!idev)) |
122bdf67 | 1376 | return ERR_PTR(-ENODEV); |
1da177e4 | 1377 | |
8b96d22d | 1378 | rt = ip6_dst_alloc(net, dev, 0, NULL); |
38308473 | 1379 | if (unlikely(!rt)) { |
1da177e4 | 1380 | in6_dev_put(idev); |
87a11578 | 1381 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1382 | goto out; |
1383 | } | |
1384 | ||
8e2ec639 YZ |
1385 | rt->dst.flags |= DST_HOST; |
1386 | rt->dst.output = ip6_output; | |
d8d1f30b | 1387 | atomic_set(&rt->dst.__refcnt, 1); |
550bab42 | 1388 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 1389 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1390 | rt->rt6i_dst.plen = 128; |
1391 | rt->rt6i_idev = idev; | |
14edd87d | 1392 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1393 | |
3b00944c | 1394 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1395 | rt->dst.next = icmp6_dst_gc_list; |
1396 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1397 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1398 | |
5578689a | 1399 | fib6_force_start_gc(net); |
1da177e4 | 1400 | |
87a11578 DM |
1401 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1402 | ||
1da177e4 | 1403 | out: |
87a11578 | 1404 | return dst; |
1da177e4 LT |
1405 | } |
1406 | ||
3d0f24a7 | 1407 | int icmp6_dst_gc(void) |
1da177e4 | 1408 | { |
e9476e95 | 1409 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1410 | int more = 0; |
1da177e4 | 1411 | |
3b00944c YH |
1412 | spin_lock_bh(&icmp6_dst_lock); |
1413 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1414 | |
1da177e4 LT |
1415 | while ((dst = *pprev) != NULL) { |
1416 | if (!atomic_read(&dst->__refcnt)) { | |
1417 | *pprev = dst->next; | |
1418 | dst_free(dst); | |
1da177e4 LT |
1419 | } else { |
1420 | pprev = &dst->next; | |
3d0f24a7 | 1421 | ++more; |
1da177e4 LT |
1422 | } |
1423 | } | |
1424 | ||
3b00944c | 1425 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1426 | |
3d0f24a7 | 1427 | return more; |
1da177e4 LT |
1428 | } |
1429 | ||
1e493d19 DM |
1430 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1431 | void *arg) | |
1432 | { | |
1433 | struct dst_entry *dst, **pprev; | |
1434 | ||
1435 | spin_lock_bh(&icmp6_dst_lock); | |
1436 | pprev = &icmp6_dst_gc_list; | |
1437 | while ((dst = *pprev) != NULL) { | |
1438 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1439 | if (func(rt, arg)) { | |
1440 | *pprev = dst->next; | |
1441 | dst_free(dst); | |
1442 | } else { | |
1443 | pprev = &dst->next; | |
1444 | } | |
1445 | } | |
1446 | spin_unlock_bh(&icmp6_dst_lock); | |
1447 | } | |
1448 | ||
569d3645 | 1449 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1450 | { |
86393e52 | 1451 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1452 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1453 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1454 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1455 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1456 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1457 | int entries; |
7019b78e | 1458 | |
fc66f95c | 1459 | entries = dst_entries_get_fast(ops); |
49a18d86 | 1460 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 1461 | entries <= rt_max_size) |
1da177e4 LT |
1462 | goto out; |
1463 | ||
6891a346 | 1464 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 1465 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
1466 | entries = dst_entries_get_slow(ops); |
1467 | if (entries < ops->gc_thresh) | |
7019b78e | 1468 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1469 | out: |
7019b78e | 1470 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1471 | return entries > rt_max_size; |
1da177e4 LT |
1472 | } |
1473 | ||
e715b6d3 FW |
1474 | static int ip6_convert_metrics(struct mx6_config *mxc, |
1475 | const struct fib6_config *cfg) | |
1476 | { | |
1477 | struct nlattr *nla; | |
1478 | int remaining; | |
1479 | u32 *mp; | |
1480 | ||
1481 | if (cfg->fc_mx == NULL) | |
1482 | return 0; | |
1483 | ||
1484 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1485 | if (unlikely(!mp)) | |
1486 | return -ENOMEM; | |
1487 | ||
1488 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1489 | int type = nla_type(nla); | |
1490 | ||
1491 | if (type) { | |
ea697639 DB |
1492 | u32 val; |
1493 | ||
e715b6d3 FW |
1494 | if (unlikely(type > RTAX_MAX)) |
1495 | goto err; | |
ea697639 DB |
1496 | if (type == RTAX_CC_ALGO) { |
1497 | char tmp[TCP_CA_NAME_MAX]; | |
1498 | ||
1499 | nla_strlcpy(tmp, nla, sizeof(tmp)); | |
1500 | val = tcp_ca_get_key_by_name(tmp); | |
1501 | if (val == TCP_CA_UNSPEC) | |
1502 | goto err; | |
1503 | } else { | |
1504 | val = nla_get_u32(nla); | |
1505 | } | |
e715b6d3 | 1506 | |
ea697639 | 1507 | mp[type - 1] = val; |
e715b6d3 FW |
1508 | __set_bit(type - 1, mxc->mx_valid); |
1509 | } | |
1510 | } | |
1511 | ||
1512 | mxc->mx = mp; | |
1513 | ||
1514 | return 0; | |
1515 | err: | |
1516 | kfree(mp); | |
1517 | return -EINVAL; | |
1518 | } | |
1da177e4 | 1519 | |
86872cb5 | 1520 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1521 | { |
1522 | int err; | |
5578689a | 1523 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1524 | struct rt6_info *rt = NULL; |
1525 | struct net_device *dev = NULL; | |
1526 | struct inet6_dev *idev = NULL; | |
c71099ac | 1527 | struct fib6_table *table; |
e715b6d3 | 1528 | struct mx6_config mxc = { .mx = NULL, }; |
1da177e4 LT |
1529 | int addr_type; |
1530 | ||
86872cb5 | 1531 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1532 | return -EINVAL; |
1533 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1534 | if (cfg->fc_src_len) |
1da177e4 LT |
1535 | return -EINVAL; |
1536 | #endif | |
86872cb5 | 1537 | if (cfg->fc_ifindex) { |
1da177e4 | 1538 | err = -ENODEV; |
5578689a | 1539 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1540 | if (!dev) |
1541 | goto out; | |
1542 | idev = in6_dev_get(dev); | |
1543 | if (!idev) | |
1544 | goto out; | |
1545 | } | |
1546 | ||
86872cb5 TG |
1547 | if (cfg->fc_metric == 0) |
1548 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1549 | |
d71314b4 | 1550 | err = -ENOBUFS; |
38308473 DM |
1551 | if (cfg->fc_nlinfo.nlh && |
1552 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1553 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1554 | if (!table) { |
f3213831 | 1555 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1556 | table = fib6_new_table(net, cfg->fc_table); |
1557 | } | |
1558 | } else { | |
1559 | table = fib6_new_table(net, cfg->fc_table); | |
1560 | } | |
38308473 DM |
1561 | |
1562 | if (!table) | |
c71099ac | 1563 | goto out; |
c71099ac | 1564 | |
c88507fb | 1565 | rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table); |
1da177e4 | 1566 | |
38308473 | 1567 | if (!rt) { |
1da177e4 LT |
1568 | err = -ENOMEM; |
1569 | goto out; | |
1570 | } | |
1571 | ||
1716a961 G |
1572 | if (cfg->fc_flags & RTF_EXPIRES) |
1573 | rt6_set_expires(rt, jiffies + | |
1574 | clock_t_to_jiffies(cfg->fc_expires)); | |
1575 | else | |
1576 | rt6_clean_expires(rt); | |
1da177e4 | 1577 | |
86872cb5 TG |
1578 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1579 | cfg->fc_protocol = RTPROT_BOOT; | |
1580 | rt->rt6i_protocol = cfg->fc_protocol; | |
1581 | ||
1582 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1583 | |
1584 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1585 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1586 | else if (cfg->fc_flags & RTF_LOCAL) |
1587 | rt->dst.input = ip6_input; | |
1da177e4 | 1588 | else |
d8d1f30b | 1589 | rt->dst.input = ip6_forward; |
1da177e4 | 1590 | |
d8d1f30b | 1591 | rt->dst.output = ip6_output; |
1da177e4 | 1592 | |
86872cb5 TG |
1593 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1594 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
e5fd387a MK |
1595 | if (rt->rt6i_dst.plen == 128) { |
1596 | rt->dst.flags |= DST_HOST; | |
1597 | dst_metrics_set_force_overwrite(&rt->dst); | |
8e2ec639 | 1598 | } |
e5fd387a | 1599 | |
1da177e4 | 1600 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1601 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1602 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1603 | #endif |
1604 | ||
86872cb5 | 1605 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1606 | |
1607 | /* We cannot add true routes via loopback here, | |
1608 | they would result in kernel looping; promote them to reject routes | |
1609 | */ | |
86872cb5 | 1610 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1611 | (dev && (dev->flags & IFF_LOOPBACK) && |
1612 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1613 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1614 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1615 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1616 | if (dev) { |
1617 | dev_put(dev); | |
1618 | in6_dev_put(idev); | |
1619 | } | |
5578689a | 1620 | dev = net->loopback_dev; |
1da177e4 LT |
1621 | dev_hold(dev); |
1622 | idev = in6_dev_get(dev); | |
1623 | if (!idev) { | |
1624 | err = -ENODEV; | |
1625 | goto out; | |
1626 | } | |
1627 | } | |
1da177e4 | 1628 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1629 | switch (cfg->fc_type) { |
1630 | case RTN_BLACKHOLE: | |
1631 | rt->dst.error = -EINVAL; | |
aad88724 | 1632 | rt->dst.output = dst_discard_sk; |
7150aede | 1633 | rt->dst.input = dst_discard; |
ef2c7d7b ND |
1634 | break; |
1635 | case RTN_PROHIBIT: | |
1636 | rt->dst.error = -EACCES; | |
7150aede K |
1637 | rt->dst.output = ip6_pkt_prohibit_out; |
1638 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 1639 | break; |
b4949ab2 | 1640 | case RTN_THROW: |
ef2c7d7b | 1641 | default: |
7150aede K |
1642 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
1643 | : -ENETUNREACH; | |
1644 | rt->dst.output = ip6_pkt_discard_out; | |
1645 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
1646 | break; |
1647 | } | |
1da177e4 LT |
1648 | goto install_route; |
1649 | } | |
1650 | ||
86872cb5 | 1651 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1652 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1653 | int gwa_type; |
1654 | ||
86872cb5 | 1655 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1656 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1657 | gwa_type = ipv6_addr_type(gw_addr); |
1658 | ||
1659 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1660 | struct rt6_info *grt; | |
1661 | ||
1662 | /* IPv6 strictly inhibits using not link-local | |
1663 | addresses as nexthop address. | |
1664 | Otherwise, router will not able to send redirects. | |
1665 | It is very good, but in some (rare!) circumstances | |
1666 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1667 | some exceptions. --ANK | |
1668 | */ | |
1669 | err = -EINVAL; | |
38308473 | 1670 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1671 | goto out; |
1672 | ||
5578689a | 1673 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1674 | |
1675 | err = -EHOSTUNREACH; | |
38308473 | 1676 | if (!grt) |
1da177e4 LT |
1677 | goto out; |
1678 | if (dev) { | |
d1918542 | 1679 | if (dev != grt->dst.dev) { |
94e187c0 | 1680 | ip6_rt_put(grt); |
1da177e4 LT |
1681 | goto out; |
1682 | } | |
1683 | } else { | |
d1918542 | 1684 | dev = grt->dst.dev; |
1da177e4 LT |
1685 | idev = grt->rt6i_idev; |
1686 | dev_hold(dev); | |
1687 | in6_dev_hold(grt->rt6i_idev); | |
1688 | } | |
38308473 | 1689 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1690 | err = 0; |
94e187c0 | 1691 | ip6_rt_put(grt); |
1da177e4 LT |
1692 | |
1693 | if (err) | |
1694 | goto out; | |
1695 | } | |
1696 | err = -EINVAL; | |
38308473 | 1697 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1698 | goto out; |
1699 | } | |
1700 | ||
1701 | err = -ENODEV; | |
38308473 | 1702 | if (!dev) |
1da177e4 LT |
1703 | goto out; |
1704 | ||
c3968a85 DW |
1705 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1706 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1707 | err = -EINVAL; | |
1708 | goto out; | |
1709 | } | |
4e3fd7a0 | 1710 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1711 | rt->rt6i_prefsrc.plen = 128; |
1712 | } else | |
1713 | rt->rt6i_prefsrc.plen = 0; | |
1714 | ||
86872cb5 | 1715 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1716 | |
1717 | install_route: | |
d8d1f30b | 1718 | rt->dst.dev = dev; |
1da177e4 | 1719 | rt->rt6i_idev = idev; |
c71099ac | 1720 | rt->rt6i_table = table; |
63152fc0 | 1721 | |
c346dca1 | 1722 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1723 | |
e715b6d3 FW |
1724 | err = ip6_convert_metrics(&mxc, cfg); |
1725 | if (err) | |
1726 | goto out; | |
1da177e4 | 1727 | |
e715b6d3 FW |
1728 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc); |
1729 | ||
1730 | kfree(mxc.mx); | |
1731 | return err; | |
1da177e4 LT |
1732 | out: |
1733 | if (dev) | |
1734 | dev_put(dev); | |
1735 | if (idev) | |
1736 | in6_dev_put(idev); | |
1737 | if (rt) | |
d8d1f30b | 1738 | dst_free(&rt->dst); |
1da177e4 LT |
1739 | return err; |
1740 | } | |
1741 | ||
86872cb5 | 1742 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1743 | { |
1744 | int err; | |
c71099ac | 1745 | struct fib6_table *table; |
d1918542 | 1746 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1747 | |
6825a26c G |
1748 | if (rt == net->ipv6.ip6_null_entry) { |
1749 | err = -ENOENT; | |
1750 | goto out; | |
1751 | } | |
6c813a72 | 1752 | |
c71099ac TG |
1753 | table = rt->rt6i_table; |
1754 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 1755 | err = fib6_del(rt, info); |
c71099ac | 1756 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 1757 | |
6825a26c | 1758 | out: |
94e187c0 | 1759 | ip6_rt_put(rt); |
1da177e4 LT |
1760 | return err; |
1761 | } | |
1762 | ||
e0a1ad73 TG |
1763 | int ip6_del_rt(struct rt6_info *rt) |
1764 | { | |
4d1169c1 | 1765 | struct nl_info info = { |
d1918542 | 1766 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1767 | }; |
528c4ceb | 1768 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1769 | } |
1770 | ||
86872cb5 | 1771 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1772 | { |
c71099ac | 1773 | struct fib6_table *table; |
1da177e4 LT |
1774 | struct fib6_node *fn; |
1775 | struct rt6_info *rt; | |
1776 | int err = -ESRCH; | |
1777 | ||
5578689a | 1778 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1779 | if (!table) |
c71099ac TG |
1780 | return err; |
1781 | ||
1782 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1783 | |
c71099ac | 1784 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1785 | &cfg->fc_dst, cfg->fc_dst_len, |
1786 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1787 | |
1da177e4 | 1788 | if (fn) { |
d8d1f30b | 1789 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1790 | if (cfg->fc_ifindex && |
d1918542 DM |
1791 | (!rt->dst.dev || |
1792 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1793 | continue; |
86872cb5 TG |
1794 | if (cfg->fc_flags & RTF_GATEWAY && |
1795 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1796 | continue; |
86872cb5 | 1797 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1798 | continue; |
d8d1f30b | 1799 | dst_hold(&rt->dst); |
c71099ac | 1800 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1801 | |
86872cb5 | 1802 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1803 | } |
1804 | } | |
c71099ac | 1805 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1806 | |
1807 | return err; | |
1808 | } | |
1809 | ||
6700c270 | 1810 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 1811 | { |
e8599ff4 | 1812 | struct net *net = dev_net(skb->dev); |
a6279458 | 1813 | struct netevent_redirect netevent; |
e8599ff4 | 1814 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
1815 | struct ndisc_options ndopts; |
1816 | struct inet6_dev *in6_dev; | |
1817 | struct neighbour *neigh; | |
71bcdba0 | 1818 | struct rd_msg *msg; |
6e157b6a DM |
1819 | int optlen, on_link; |
1820 | u8 *lladdr; | |
e8599ff4 | 1821 | |
29a3cad5 | 1822 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 1823 | optlen -= sizeof(*msg); |
e8599ff4 DM |
1824 | |
1825 | if (optlen < 0) { | |
6e157b6a | 1826 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
1827 | return; |
1828 | } | |
1829 | ||
71bcdba0 | 1830 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 1831 | |
71bcdba0 | 1832 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 1833 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
1834 | return; |
1835 | } | |
1836 | ||
6e157b6a | 1837 | on_link = 0; |
71bcdba0 | 1838 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 1839 | on_link = 1; |
71bcdba0 | 1840 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 1841 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 1842 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
1843 | return; |
1844 | } | |
1845 | ||
1846 | in6_dev = __in6_dev_get(skb->dev); | |
1847 | if (!in6_dev) | |
1848 | return; | |
1849 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
1850 | return; | |
1851 | ||
1852 | /* RFC2461 8.1: | |
1853 | * The IP source address of the Redirect MUST be the same as the current | |
1854 | * first-hop router for the specified ICMP Destination Address. | |
1855 | */ | |
1856 | ||
71bcdba0 | 1857 | if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
1858 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
1859 | return; | |
1860 | } | |
6e157b6a DM |
1861 | |
1862 | lladdr = NULL; | |
e8599ff4 DM |
1863 | if (ndopts.nd_opts_tgt_lladdr) { |
1864 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1865 | skb->dev); | |
1866 | if (!lladdr) { | |
1867 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
1868 | return; | |
1869 | } | |
1870 | } | |
1871 | ||
6e157b6a DM |
1872 | rt = (struct rt6_info *) dst; |
1873 | if (rt == net->ipv6.ip6_null_entry) { | |
1874 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); | |
e8599ff4 | 1875 | return; |
6e157b6a | 1876 | } |
e8599ff4 | 1877 | |
6e157b6a DM |
1878 | /* Redirect received -> path was valid. |
1879 | * Look, redirects are sent only in response to data packets, | |
1880 | * so that this nexthop apparently is reachable. --ANK | |
1881 | */ | |
1882 | dst_confirm(&rt->dst); | |
a6279458 | 1883 | |
71bcdba0 | 1884 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
1885 | if (!neigh) |
1886 | return; | |
a6279458 | 1887 | |
1da177e4 LT |
1888 | /* |
1889 | * We have finally decided to accept it. | |
1890 | */ | |
1891 | ||
1ab1457c | 1892 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1893 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1894 | NEIGH_UPDATE_F_OVERRIDE| | |
1895 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1896 | NEIGH_UPDATE_F_ISROUTER)) | |
1897 | ); | |
1898 | ||
71bcdba0 | 1899 | nrt = ip6_rt_copy(rt, &msg->dest); |
38308473 | 1900 | if (!nrt) |
1da177e4 LT |
1901 | goto out; |
1902 | ||
1903 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1904 | if (on_link) | |
1905 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1906 | ||
4e3fd7a0 | 1907 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 1908 | |
40e22e8f | 1909 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1910 | goto out; |
1911 | ||
d8d1f30b CG |
1912 | netevent.old = &rt->dst; |
1913 | netevent.new = &nrt->dst; | |
71bcdba0 | 1914 | netevent.daddr = &msg->dest; |
60592833 | 1915 | netevent.neigh = neigh; |
8d71740c TT |
1916 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1917 | ||
38308473 | 1918 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 1919 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 1920 | ip6_del_rt(rt); |
1da177e4 LT |
1921 | } |
1922 | ||
1923 | out: | |
e8599ff4 | 1924 | neigh_release(neigh); |
6e157b6a DM |
1925 | } |
1926 | ||
1da177e4 LT |
1927 | /* |
1928 | * Misc support functions | |
1929 | */ | |
1930 | ||
1716a961 | 1931 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 1932 | const struct in6_addr *dest) |
1da177e4 | 1933 | { |
d1918542 | 1934 | struct net *net = dev_net(ort->dst.dev); |
8b96d22d DM |
1935 | struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0, |
1936 | ort->rt6i_table); | |
1da177e4 LT |
1937 | |
1938 | if (rt) { | |
d8d1f30b CG |
1939 | rt->dst.input = ort->dst.input; |
1940 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1941 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1942 | |
4e3fd7a0 | 1943 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1944 | rt->rt6i_dst.plen = 128; |
defb3519 | 1945 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1946 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1947 | rt->rt6i_idev = ort->rt6i_idev; |
1948 | if (rt->rt6i_idev) | |
1949 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1950 | rt->dst.lastuse = jiffies; |
1da177e4 | 1951 | |
550bab42 JA |
1952 | if (ort->rt6i_flags & RTF_GATEWAY) |
1953 | rt->rt6i_gateway = ort->rt6i_gateway; | |
1954 | else | |
1955 | rt->rt6i_gateway = *dest; | |
1716a961 | 1956 | rt->rt6i_flags = ort->rt6i_flags; |
24f5b855 | 1957 | rt6_set_from(rt, ort); |
1da177e4 LT |
1958 | rt->rt6i_metric = 0; |
1959 | ||
1da177e4 LT |
1960 | #ifdef CONFIG_IPV6_SUBTREES |
1961 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1962 | #endif | |
0f6c6392 | 1963 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1964 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1965 | } |
1966 | return rt; | |
1967 | } | |
1968 | ||
70ceb4f5 | 1969 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1970 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1971 | const struct in6_addr *prefix, int prefixlen, |
1972 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1973 | { |
1974 | struct fib6_node *fn; | |
1975 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1976 | struct fib6_table *table; |
1977 | ||
efa2cea0 | 1978 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 1979 | if (!table) |
c71099ac | 1980 | return NULL; |
70ceb4f5 | 1981 | |
5744dd9b | 1982 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 1983 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0); |
70ceb4f5 YH |
1984 | if (!fn) |
1985 | goto out; | |
1986 | ||
d8d1f30b | 1987 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 1988 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
1989 | continue; |
1990 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1991 | continue; | |
1992 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1993 | continue; | |
d8d1f30b | 1994 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1995 | break; |
1996 | } | |
1997 | out: | |
5744dd9b | 1998 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1999 | return rt; |
2000 | } | |
2001 | ||
efa2cea0 | 2002 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
2003 | const struct in6_addr *prefix, int prefixlen, |
2004 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 2005 | unsigned int pref) |
70ceb4f5 | 2006 | { |
86872cb5 TG |
2007 | struct fib6_config cfg = { |
2008 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 2009 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2010 | .fc_ifindex = ifindex, |
2011 | .fc_dst_len = prefixlen, | |
2012 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
2013 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 2014 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
2015 | .fc_nlinfo.nlh = NULL, |
2016 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
2017 | }; |
2018 | ||
4e3fd7a0 AD |
2019 | cfg.fc_dst = *prefix; |
2020 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 2021 | |
e317da96 YH |
2022 | /* We should treat it as a default route if prefix length is 0. */ |
2023 | if (!prefixlen) | |
86872cb5 | 2024 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 2025 | |
86872cb5 | 2026 | ip6_route_add(&cfg); |
70ceb4f5 | 2027 | |
efa2cea0 | 2028 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
2029 | } |
2030 | #endif | |
2031 | ||
b71d1d42 | 2032 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 2033 | { |
1da177e4 | 2034 | struct rt6_info *rt; |
c71099ac | 2035 | struct fib6_table *table; |
1da177e4 | 2036 | |
c346dca1 | 2037 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 2038 | if (!table) |
c71099ac | 2039 | return NULL; |
1da177e4 | 2040 | |
5744dd9b | 2041 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2042 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2043 | if (dev == rt->dst.dev && |
045927ff | 2044 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
2045 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
2046 | break; | |
2047 | } | |
2048 | if (rt) | |
d8d1f30b | 2049 | dst_hold(&rt->dst); |
5744dd9b | 2050 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2051 | return rt; |
2052 | } | |
2053 | ||
b71d1d42 | 2054 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
2055 | struct net_device *dev, |
2056 | unsigned int pref) | |
1da177e4 | 2057 | { |
86872cb5 TG |
2058 | struct fib6_config cfg = { |
2059 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 2060 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2061 | .fc_ifindex = dev->ifindex, |
2062 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
2063 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 2064 | .fc_nlinfo.portid = 0, |
5578689a | 2065 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 2066 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 2067 | }; |
1da177e4 | 2068 | |
4e3fd7a0 | 2069 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 2070 | |
86872cb5 | 2071 | ip6_route_add(&cfg); |
1da177e4 | 2072 | |
1da177e4 LT |
2073 | return rt6_get_dflt_router(gwaddr, dev); |
2074 | } | |
2075 | ||
7b4da532 | 2076 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
2077 | { |
2078 | struct rt6_info *rt; | |
c71099ac TG |
2079 | struct fib6_table *table; |
2080 | ||
2081 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 2082 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 2083 | if (!table) |
c71099ac | 2084 | return; |
1da177e4 LT |
2085 | |
2086 | restart: | |
c71099ac | 2087 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 2088 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
3e8b0ac3 LC |
2089 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
2090 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d8d1f30b | 2091 | dst_hold(&rt->dst); |
c71099ac | 2092 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 2093 | ip6_del_rt(rt); |
1da177e4 LT |
2094 | goto restart; |
2095 | } | |
2096 | } | |
c71099ac | 2097 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2098 | } |
2099 | ||
5578689a DL |
2100 | static void rtmsg_to_fib6_config(struct net *net, |
2101 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
2102 | struct fib6_config *cfg) |
2103 | { | |
2104 | memset(cfg, 0, sizeof(*cfg)); | |
2105 | ||
2106 | cfg->fc_table = RT6_TABLE_MAIN; | |
2107 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
2108 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
2109 | cfg->fc_expires = rtmsg->rtmsg_info; | |
2110 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
2111 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
2112 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
2113 | ||
5578689a | 2114 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 2115 | |
4e3fd7a0 AD |
2116 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2117 | cfg->fc_src = rtmsg->rtmsg_src; | |
2118 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2119 | } |
2120 | ||
5578689a | 2121 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2122 | { |
86872cb5 | 2123 | struct fib6_config cfg; |
1da177e4 LT |
2124 | struct in6_rtmsg rtmsg; |
2125 | int err; | |
2126 | ||
67ba4152 | 2127 | switch (cmd) { |
1da177e4 LT |
2128 | case SIOCADDRT: /* Add a route */ |
2129 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 2130 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2131 | return -EPERM; |
2132 | err = copy_from_user(&rtmsg, arg, | |
2133 | sizeof(struct in6_rtmsg)); | |
2134 | if (err) | |
2135 | return -EFAULT; | |
86872cb5 | 2136 | |
5578689a | 2137 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2138 | |
1da177e4 LT |
2139 | rtnl_lock(); |
2140 | switch (cmd) { | |
2141 | case SIOCADDRT: | |
86872cb5 | 2142 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2143 | break; |
2144 | case SIOCDELRT: | |
86872cb5 | 2145 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2146 | break; |
2147 | default: | |
2148 | err = -EINVAL; | |
2149 | } | |
2150 | rtnl_unlock(); | |
2151 | ||
2152 | return err; | |
3ff50b79 | 2153 | } |
1da177e4 LT |
2154 | |
2155 | return -EINVAL; | |
2156 | } | |
2157 | ||
2158 | /* | |
2159 | * Drop the packet on the floor | |
2160 | */ | |
2161 | ||
d5fdd6ba | 2162 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2163 | { |
612f09e8 | 2164 | int type; |
adf30907 | 2165 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2166 | switch (ipstats_mib_noroutes) { |
2167 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2168 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2169 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2170 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2171 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2172 | break; |
2173 | } | |
2174 | /* FALLTHROUGH */ | |
2175 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2176 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2177 | ipstats_mib_noroutes); | |
612f09e8 YH |
2178 | break; |
2179 | } | |
3ffe533c | 2180 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2181 | kfree_skb(skb); |
2182 | return 0; | |
2183 | } | |
2184 | ||
9ce8ade0 TG |
2185 | static int ip6_pkt_discard(struct sk_buff *skb) |
2186 | { | |
612f09e8 | 2187 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2188 | } |
2189 | ||
aad88724 | 2190 | static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 2191 | { |
adf30907 | 2192 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2193 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2194 | } |
2195 | ||
9ce8ade0 TG |
2196 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2197 | { | |
612f09e8 | 2198 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2199 | } |
2200 | ||
aad88724 | 2201 | static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 2202 | { |
adf30907 | 2203 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2204 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2205 | } |
2206 | ||
1da177e4 LT |
2207 | /* |
2208 | * Allocate a dst for local (unicast / anycast) address. | |
2209 | */ | |
2210 | ||
2211 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2212 | const struct in6_addr *addr, | |
8f031519 | 2213 | bool anycast) |
1da177e4 | 2214 | { |
c346dca1 | 2215 | struct net *net = dev_net(idev->dev); |
a3300ef4 HFS |
2216 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, |
2217 | DST_NOCOUNT, NULL); | |
2218 | if (!rt) | |
1da177e4 LT |
2219 | return ERR_PTR(-ENOMEM); |
2220 | ||
1da177e4 LT |
2221 | in6_dev_hold(idev); |
2222 | ||
11d53b49 | 2223 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2224 | rt->dst.input = ip6_input; |
2225 | rt->dst.output = ip6_output; | |
1da177e4 | 2226 | rt->rt6i_idev = idev; |
1da177e4 LT |
2227 | |
2228 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2229 | if (anycast) |
2230 | rt->rt6i_flags |= RTF_ANYCAST; | |
2231 | else | |
1da177e4 | 2232 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2233 | |
550bab42 | 2234 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 2235 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2236 | rt->rt6i_dst.plen = 128; |
5578689a | 2237 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2238 | |
d8d1f30b | 2239 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2240 | |
2241 | return rt; | |
2242 | } | |
2243 | ||
c3968a85 DW |
2244 | int ip6_route_get_saddr(struct net *net, |
2245 | struct rt6_info *rt, | |
b71d1d42 | 2246 | const struct in6_addr *daddr, |
c3968a85 DW |
2247 | unsigned int prefs, |
2248 | struct in6_addr *saddr) | |
2249 | { | |
67ba4152 | 2250 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt); |
c3968a85 DW |
2251 | int err = 0; |
2252 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2253 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2254 | else |
2255 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2256 | daddr, prefs, saddr); | |
2257 | return err; | |
2258 | } | |
2259 | ||
2260 | /* remove deleted ip from prefsrc entries */ | |
2261 | struct arg_dev_net_ip { | |
2262 | struct net_device *dev; | |
2263 | struct net *net; | |
2264 | struct in6_addr *addr; | |
2265 | }; | |
2266 | ||
2267 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2268 | { | |
2269 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2270 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2271 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2272 | ||
d1918542 | 2273 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2274 | rt != net->ipv6.ip6_null_entry && |
2275 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2276 | /* remove prefsrc entry */ | |
2277 | rt->rt6i_prefsrc.plen = 0; | |
2278 | } | |
2279 | return 0; | |
2280 | } | |
2281 | ||
2282 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2283 | { | |
2284 | struct net *net = dev_net(ifp->idev->dev); | |
2285 | struct arg_dev_net_ip adni = { | |
2286 | .dev = ifp->idev->dev, | |
2287 | .net = net, | |
2288 | .addr = &ifp->addr, | |
2289 | }; | |
0c3584d5 | 2290 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
2291 | } |
2292 | ||
be7a010d DJ |
2293 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) |
2294 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) | |
2295 | ||
2296 | /* Remove routers and update dst entries when gateway turn into host. */ | |
2297 | static int fib6_clean_tohost(struct rt6_info *rt, void *arg) | |
2298 | { | |
2299 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
2300 | ||
2301 | if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) || | |
2302 | ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) && | |
2303 | ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { | |
2304 | return -1; | |
2305 | } | |
2306 | return 0; | |
2307 | } | |
2308 | ||
2309 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
2310 | { | |
2311 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
2312 | } | |
2313 | ||
8ed67789 DL |
2314 | struct arg_dev_net { |
2315 | struct net_device *dev; | |
2316 | struct net *net; | |
2317 | }; | |
2318 | ||
1da177e4 LT |
2319 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2320 | { | |
bc3ef660 | 2321 | const struct arg_dev_net *adn = arg; |
2322 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2323 | |
d1918542 | 2324 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2325 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2326 | return -1; |
c159d30c | 2327 | |
1da177e4 LT |
2328 | return 0; |
2329 | } | |
2330 | ||
f3db4851 | 2331 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2332 | { |
8ed67789 DL |
2333 | struct arg_dev_net adn = { |
2334 | .dev = dev, | |
2335 | .net = net, | |
2336 | }; | |
2337 | ||
0c3584d5 | 2338 | fib6_clean_all(net, fib6_ifdown, &adn); |
1e493d19 | 2339 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2340 | } |
2341 | ||
95c96174 | 2342 | struct rt6_mtu_change_arg { |
1da177e4 | 2343 | struct net_device *dev; |
95c96174 | 2344 | unsigned int mtu; |
1da177e4 LT |
2345 | }; |
2346 | ||
2347 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2348 | { | |
2349 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2350 | struct inet6_dev *idev; | |
2351 | ||
2352 | /* In IPv6 pmtu discovery is not optional, | |
2353 | so that RTAX_MTU lock cannot disable it. | |
2354 | We still use this lock to block changes | |
2355 | caused by addrconf/ndisc. | |
2356 | */ | |
2357 | ||
2358 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2359 | if (!idev) |
1da177e4 LT |
2360 | return 0; |
2361 | ||
2362 | /* For administrative MTU increase, there is no way to discover | |
2363 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2364 | Since RFC 1981 doesn't include administrative MTU increase | |
2365 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2366 | */ | |
2367 | /* | |
2368 | If new MTU is less than route PMTU, this new MTU will be the | |
2369 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2370 | decreases; if new MTU is greater than route PMTU, and the | |
2371 | old MTU is the lowest MTU in the path, update the route PMTU | |
2372 | to reflect the increase. In this case if the other nodes' MTU | |
2373 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2374 | PMTU discouvery. | |
2375 | */ | |
d1918542 | 2376 | if (rt->dst.dev == arg->dev && |
d8d1f30b CG |
2377 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2378 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2379 | (dst_mtu(&rt->dst) < arg->mtu && | |
2380 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2381 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2382 | } |
1da177e4 LT |
2383 | return 0; |
2384 | } | |
2385 | ||
95c96174 | 2386 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2387 | { |
c71099ac TG |
2388 | struct rt6_mtu_change_arg arg = { |
2389 | .dev = dev, | |
2390 | .mtu = mtu, | |
2391 | }; | |
1da177e4 | 2392 | |
0c3584d5 | 2393 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
2394 | } |
2395 | ||
ef7c79ed | 2396 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2397 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2398 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2399 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2400 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2401 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2402 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
86872cb5 TG |
2403 | }; |
2404 | ||
2405 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2406 | struct fib6_config *cfg) | |
1da177e4 | 2407 | { |
86872cb5 TG |
2408 | struct rtmsg *rtm; |
2409 | struct nlattr *tb[RTA_MAX+1]; | |
2410 | int err; | |
1da177e4 | 2411 | |
86872cb5 TG |
2412 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2413 | if (err < 0) | |
2414 | goto errout; | |
1da177e4 | 2415 | |
86872cb5 TG |
2416 | err = -EINVAL; |
2417 | rtm = nlmsg_data(nlh); | |
2418 | memset(cfg, 0, sizeof(*cfg)); | |
2419 | ||
2420 | cfg->fc_table = rtm->rtm_table; | |
2421 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2422 | cfg->fc_src_len = rtm->rtm_src_len; | |
2423 | cfg->fc_flags = RTF_UP; | |
2424 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2425 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2426 | |
ef2c7d7b ND |
2427 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2428 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2429 | rtm->rtm_type == RTN_PROHIBIT || |
2430 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2431 | cfg->fc_flags |= RTF_REJECT; |
2432 | ||
ab79ad14 MŻ |
2433 | if (rtm->rtm_type == RTN_LOCAL) |
2434 | cfg->fc_flags |= RTF_LOCAL; | |
2435 | ||
15e47304 | 2436 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2437 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2438 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2439 | |
2440 | if (tb[RTA_GATEWAY]) { | |
2441 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2442 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2443 | } |
86872cb5 TG |
2444 | |
2445 | if (tb[RTA_DST]) { | |
2446 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2447 | ||
2448 | if (nla_len(tb[RTA_DST]) < plen) | |
2449 | goto errout; | |
2450 | ||
2451 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2452 | } |
86872cb5 TG |
2453 | |
2454 | if (tb[RTA_SRC]) { | |
2455 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2456 | ||
2457 | if (nla_len(tb[RTA_SRC]) < plen) | |
2458 | goto errout; | |
2459 | ||
2460 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2461 | } |
86872cb5 | 2462 | |
c3968a85 DW |
2463 | if (tb[RTA_PREFSRC]) |
2464 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2465 | ||
86872cb5 TG |
2466 | if (tb[RTA_OIF]) |
2467 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2468 | ||
2469 | if (tb[RTA_PRIORITY]) | |
2470 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2471 | ||
2472 | if (tb[RTA_METRICS]) { | |
2473 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2474 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2475 | } |
86872cb5 TG |
2476 | |
2477 | if (tb[RTA_TABLE]) | |
2478 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2479 | ||
51ebd318 ND |
2480 | if (tb[RTA_MULTIPATH]) { |
2481 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2482 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
2483 | } | |
2484 | ||
86872cb5 TG |
2485 | err = 0; |
2486 | errout: | |
2487 | return err; | |
1da177e4 LT |
2488 | } |
2489 | ||
51ebd318 ND |
2490 | static int ip6_route_multipath(struct fib6_config *cfg, int add) |
2491 | { | |
2492 | struct fib6_config r_cfg; | |
2493 | struct rtnexthop *rtnh; | |
2494 | int remaining; | |
2495 | int attrlen; | |
2496 | int err = 0, last_err = 0; | |
2497 | ||
2498 | beginning: | |
2499 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
2500 | remaining = cfg->fc_mp_len; | |
2501 | ||
2502 | /* Parse a Multipath Entry */ | |
2503 | while (rtnh_ok(rtnh, remaining)) { | |
2504 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2505 | if (rtnh->rtnh_ifindex) | |
2506 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2507 | ||
2508 | attrlen = rtnh_attrlen(rtnh); | |
2509 | if (attrlen > 0) { | |
2510 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2511 | ||
2512 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2513 | if (nla) { | |
2514 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
2515 | r_cfg.fc_flags |= RTF_GATEWAY; | |
2516 | } | |
2517 | } | |
2518 | err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg); | |
2519 | if (err) { | |
2520 | last_err = err; | |
2521 | /* If we are trying to remove a route, do not stop the | |
2522 | * loop when ip6_route_del() fails (because next hop is | |
2523 | * already gone), we should try to remove all next hops. | |
2524 | */ | |
2525 | if (add) { | |
2526 | /* If add fails, we should try to delete all | |
2527 | * next hops that have been already added. | |
2528 | */ | |
2529 | add = 0; | |
2530 | goto beginning; | |
2531 | } | |
2532 | } | |
1a72418b ND |
2533 | /* Because each route is added like a single route we remove |
2534 | * this flag after the first nexthop (if there is a collision, | |
2535 | * we have already fail to add the first nexthop: | |
2536 | * fib6_add_rt2node() has reject it). | |
2537 | */ | |
2538 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL; | |
51ebd318 ND |
2539 | rtnh = rtnh_next(rtnh, &remaining); |
2540 | } | |
2541 | ||
2542 | return last_err; | |
2543 | } | |
2544 | ||
67ba4152 | 2545 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 2546 | { |
86872cb5 TG |
2547 | struct fib6_config cfg; |
2548 | int err; | |
1da177e4 | 2549 | |
86872cb5 TG |
2550 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2551 | if (err < 0) | |
2552 | return err; | |
2553 | ||
51ebd318 ND |
2554 | if (cfg.fc_mp) |
2555 | return ip6_route_multipath(&cfg, 0); | |
2556 | else | |
2557 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2558 | } |
2559 | ||
67ba4152 | 2560 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 2561 | { |
86872cb5 TG |
2562 | struct fib6_config cfg; |
2563 | int err; | |
1da177e4 | 2564 | |
86872cb5 TG |
2565 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2566 | if (err < 0) | |
2567 | return err; | |
2568 | ||
51ebd318 ND |
2569 | if (cfg.fc_mp) |
2570 | return ip6_route_multipath(&cfg, 1); | |
2571 | else | |
2572 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2573 | } |
2574 | ||
339bf98f TG |
2575 | static inline size_t rt6_nlmsg_size(void) |
2576 | { | |
2577 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2578 | + nla_total_size(16) /* RTA_SRC */ | |
2579 | + nla_total_size(16) /* RTA_DST */ | |
2580 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2581 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2582 | + nla_total_size(4) /* RTA_TABLE */ | |
2583 | + nla_total_size(4) /* RTA_IIF */ | |
2584 | + nla_total_size(4) /* RTA_OIF */ | |
2585 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2586 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 DB |
2587 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
2588 | + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ | |
339bf98f TG |
2589 | } |
2590 | ||
191cd582 BH |
2591 | static int rt6_fill_node(struct net *net, |
2592 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 2593 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 2594 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 2595 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2596 | { |
2597 | struct rtmsg *rtm; | |
2d7202bf | 2598 | struct nlmsghdr *nlh; |
e3703b3d | 2599 | long expires; |
9e762a4a | 2600 | u32 table; |
1da177e4 LT |
2601 | |
2602 | if (prefix) { /* user wants prefix routes only */ | |
2603 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2604 | /* success since this is not a prefix route */ | |
2605 | return 1; | |
2606 | } | |
2607 | } | |
2608 | ||
15e47304 | 2609 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 2610 | if (!nlh) |
26932566 | 2611 | return -EMSGSIZE; |
2d7202bf TG |
2612 | |
2613 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2614 | rtm->rtm_family = AF_INET6; |
2615 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2616 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2617 | rtm->rtm_tos = 0; | |
c71099ac | 2618 | if (rt->rt6i_table) |
9e762a4a | 2619 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2620 | else |
9e762a4a PM |
2621 | table = RT6_TABLE_UNSPEC; |
2622 | rtm->rtm_table = table; | |
c78679e8 DM |
2623 | if (nla_put_u32(skb, RTA_TABLE, table)) |
2624 | goto nla_put_failure; | |
ef2c7d7b ND |
2625 | if (rt->rt6i_flags & RTF_REJECT) { |
2626 | switch (rt->dst.error) { | |
2627 | case -EINVAL: | |
2628 | rtm->rtm_type = RTN_BLACKHOLE; | |
2629 | break; | |
2630 | case -EACCES: | |
2631 | rtm->rtm_type = RTN_PROHIBIT; | |
2632 | break; | |
b4949ab2 ND |
2633 | case -EAGAIN: |
2634 | rtm->rtm_type = RTN_THROW; | |
2635 | break; | |
ef2c7d7b ND |
2636 | default: |
2637 | rtm->rtm_type = RTN_UNREACHABLE; | |
2638 | break; | |
2639 | } | |
2640 | } | |
38308473 | 2641 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2642 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2643 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2644 | rtm->rtm_type = RTN_LOCAL; |
2645 | else | |
2646 | rtm->rtm_type = RTN_UNICAST; | |
2647 | rtm->rtm_flags = 0; | |
2648 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2649 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2650 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 2651 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
2652 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
2653 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
2654 | rtm->rtm_protocol = RTPROT_RA; | |
2655 | else | |
2656 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2657 | } | |
1da177e4 | 2658 | |
38308473 | 2659 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2660 | rtm->rtm_flags |= RTM_F_CLONED; |
2661 | ||
2662 | if (dst) { | |
c78679e8 DM |
2663 | if (nla_put(skb, RTA_DST, 16, dst)) |
2664 | goto nla_put_failure; | |
1ab1457c | 2665 | rtm->rtm_dst_len = 128; |
1da177e4 | 2666 | } else if (rtm->rtm_dst_len) |
c78679e8 DM |
2667 | if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) |
2668 | goto nla_put_failure; | |
1da177e4 LT |
2669 | #ifdef CONFIG_IPV6_SUBTREES |
2670 | if (src) { | |
c78679e8 DM |
2671 | if (nla_put(skb, RTA_SRC, 16, src)) |
2672 | goto nla_put_failure; | |
1ab1457c | 2673 | rtm->rtm_src_len = 128; |
c78679e8 DM |
2674 | } else if (rtm->rtm_src_len && |
2675 | nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) | |
2676 | goto nla_put_failure; | |
1da177e4 | 2677 | #endif |
7bc570c8 YH |
2678 | if (iif) { |
2679 | #ifdef CONFIG_IPV6_MROUTE | |
2680 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2681 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2682 | if (err <= 0) { |
2683 | if (!nowait) { | |
2684 | if (err == 0) | |
2685 | return 0; | |
2686 | goto nla_put_failure; | |
2687 | } else { | |
2688 | if (err == -EMSGSIZE) | |
2689 | goto nla_put_failure; | |
2690 | } | |
2691 | } | |
2692 | } else | |
2693 | #endif | |
c78679e8 DM |
2694 | if (nla_put_u32(skb, RTA_IIF, iif)) |
2695 | goto nla_put_failure; | |
7bc570c8 | 2696 | } else if (dst) { |
1da177e4 | 2697 | struct in6_addr saddr_buf; |
c78679e8 DM |
2698 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
2699 | nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) | |
2700 | goto nla_put_failure; | |
1da177e4 | 2701 | } |
2d7202bf | 2702 | |
c3968a85 DW |
2703 | if (rt->rt6i_prefsrc.plen) { |
2704 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2705 | saddr_buf = rt->rt6i_prefsrc.addr; |
c78679e8 DM |
2706 | if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
2707 | goto nla_put_failure; | |
c3968a85 DW |
2708 | } |
2709 | ||
defb3519 | 2710 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2711 | goto nla_put_failure; |
2712 | ||
dd0cbf29 YH |
2713 | if (rt->rt6i_flags & RTF_GATEWAY) { |
2714 | if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0) | |
94f826b8 | 2715 | goto nla_put_failure; |
94f826b8 | 2716 | } |
2d7202bf | 2717 | |
c78679e8 DM |
2718 | if (rt->dst.dev && |
2719 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2720 | goto nla_put_failure; | |
2721 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
2722 | goto nla_put_failure; | |
8253947e LW |
2723 | |
2724 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 2725 | |
87a50699 | 2726 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 2727 | goto nla_put_failure; |
2d7202bf | 2728 | |
053c095a JB |
2729 | nlmsg_end(skb, nlh); |
2730 | return 0; | |
2d7202bf TG |
2731 | |
2732 | nla_put_failure: | |
26932566 PM |
2733 | nlmsg_cancel(skb, nlh); |
2734 | return -EMSGSIZE; | |
1da177e4 LT |
2735 | } |
2736 | ||
1b43af54 | 2737 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2738 | { |
2739 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2740 | int prefix; | |
2741 | ||
2d7202bf TG |
2742 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2743 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2744 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2745 | } else | |
2746 | prefix = 0; | |
2747 | ||
191cd582 BH |
2748 | return rt6_fill_node(arg->net, |
2749 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 2750 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2751 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2752 | } |
2753 | ||
67ba4152 | 2754 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) |
1da177e4 | 2755 | { |
3b1e0a65 | 2756 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2757 | struct nlattr *tb[RTA_MAX+1]; |
2758 | struct rt6_info *rt; | |
1da177e4 | 2759 | struct sk_buff *skb; |
ab364a6f | 2760 | struct rtmsg *rtm; |
4c9483b2 | 2761 | struct flowi6 fl6; |
72331bc0 | 2762 | int err, iif = 0, oif = 0; |
1da177e4 | 2763 | |
ab364a6f TG |
2764 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2765 | if (err < 0) | |
2766 | goto errout; | |
1da177e4 | 2767 | |
ab364a6f | 2768 | err = -EINVAL; |
4c9483b2 | 2769 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2770 | |
ab364a6f TG |
2771 | if (tb[RTA_SRC]) { |
2772 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2773 | goto errout; | |
2774 | ||
4e3fd7a0 | 2775 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2776 | } |
2777 | ||
2778 | if (tb[RTA_DST]) { | |
2779 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2780 | goto errout; | |
2781 | ||
4e3fd7a0 | 2782 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2783 | } |
2784 | ||
2785 | if (tb[RTA_IIF]) | |
2786 | iif = nla_get_u32(tb[RTA_IIF]); | |
2787 | ||
2788 | if (tb[RTA_OIF]) | |
72331bc0 | 2789 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 2790 | |
2e47b291 LC |
2791 | if (tb[RTA_MARK]) |
2792 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
2793 | ||
1da177e4 LT |
2794 | if (iif) { |
2795 | struct net_device *dev; | |
72331bc0 SL |
2796 | int flags = 0; |
2797 | ||
5578689a | 2798 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2799 | if (!dev) { |
2800 | err = -ENODEV; | |
ab364a6f | 2801 | goto errout; |
1da177e4 | 2802 | } |
72331bc0 SL |
2803 | |
2804 | fl6.flowi6_iif = iif; | |
2805 | ||
2806 | if (!ipv6_addr_any(&fl6.saddr)) | |
2807 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2808 | ||
2809 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
2810 | flags); | |
2811 | } else { | |
2812 | fl6.flowi6_oif = oif; | |
2813 | ||
2814 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
2815 | } |
2816 | ||
ab364a6f | 2817 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2818 | if (!skb) { |
94e187c0 | 2819 | ip6_rt_put(rt); |
ab364a6f TG |
2820 | err = -ENOBUFS; |
2821 | goto errout; | |
2822 | } | |
1da177e4 | 2823 | |
ab364a6f TG |
2824 | /* Reserve room for dummy headers, this skb can pass |
2825 | through good chunk of routing engine. | |
2826 | */ | |
459a98ed | 2827 | skb_reset_mac_header(skb); |
ab364a6f | 2828 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2829 | |
d8d1f30b | 2830 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2831 | |
4c9483b2 | 2832 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 2833 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 2834 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2835 | if (err < 0) { |
ab364a6f TG |
2836 | kfree_skb(skb); |
2837 | goto errout; | |
1da177e4 LT |
2838 | } |
2839 | ||
15e47304 | 2840 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 2841 | errout: |
1da177e4 | 2842 | return err; |
1da177e4 LT |
2843 | } |
2844 | ||
86872cb5 | 2845 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2846 | { |
2847 | struct sk_buff *skb; | |
5578689a | 2848 | struct net *net = info->nl_net; |
528c4ceb DL |
2849 | u32 seq; |
2850 | int err; | |
2851 | ||
2852 | err = -ENOBUFS; | |
38308473 | 2853 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2854 | |
339bf98f | 2855 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2856 | if (!skb) |
21713ebc TG |
2857 | goto errout; |
2858 | ||
191cd582 | 2859 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
15e47304 | 2860 | event, info->portid, seq, 0, 0, 0); |
26932566 PM |
2861 | if (err < 0) { |
2862 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2863 | WARN_ON(err == -EMSGSIZE); | |
2864 | kfree_skb(skb); | |
2865 | goto errout; | |
2866 | } | |
15e47304 | 2867 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
2868 | info->nlh, gfp_any()); |
2869 | return; | |
21713ebc TG |
2870 | errout: |
2871 | if (err < 0) | |
5578689a | 2872 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2873 | } |
2874 | ||
8ed67789 | 2875 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 2876 | unsigned long event, void *ptr) |
8ed67789 | 2877 | { |
351638e7 | 2878 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 2879 | struct net *net = dev_net(dev); |
8ed67789 DL |
2880 | |
2881 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2882 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2883 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2884 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2885 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2886 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2887 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2888 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2889 | #endif | |
2890 | } | |
2891 | ||
2892 | return NOTIFY_OK; | |
2893 | } | |
2894 | ||
1da177e4 LT |
2895 | /* |
2896 | * /proc | |
2897 | */ | |
2898 | ||
2899 | #ifdef CONFIG_PROC_FS | |
2900 | ||
33120b30 AD |
2901 | static const struct file_operations ipv6_route_proc_fops = { |
2902 | .owner = THIS_MODULE, | |
2903 | .open = ipv6_route_open, | |
2904 | .read = seq_read, | |
2905 | .llseek = seq_lseek, | |
8d2ca1d7 | 2906 | .release = seq_release_net, |
33120b30 AD |
2907 | }; |
2908 | ||
1da177e4 LT |
2909 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2910 | { | |
69ddb805 | 2911 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2912 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2913 | net->ipv6.rt6_stats->fib_nodes, |
2914 | net->ipv6.rt6_stats->fib_route_nodes, | |
2915 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2916 | net->ipv6.rt6_stats->fib_rt_entries, | |
2917 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2918 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2919 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2920 | |
2921 | return 0; | |
2922 | } | |
2923 | ||
2924 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2925 | { | |
de05c557 | 2926 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2927 | } |
2928 | ||
9a32144e | 2929 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2930 | .owner = THIS_MODULE, |
2931 | .open = rt6_stats_seq_open, | |
2932 | .read = seq_read, | |
2933 | .llseek = seq_lseek, | |
b6fcbdb4 | 2934 | .release = single_release_net, |
1da177e4 LT |
2935 | }; |
2936 | #endif /* CONFIG_PROC_FS */ | |
2937 | ||
2938 | #ifdef CONFIG_SYSCTL | |
2939 | ||
1da177e4 | 2940 | static |
fe2c6338 | 2941 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
2942 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2943 | { | |
c486da34 LAG |
2944 | struct net *net; |
2945 | int delay; | |
2946 | if (!write) | |
1da177e4 | 2947 | return -EINVAL; |
c486da34 LAG |
2948 | |
2949 | net = (struct net *)ctl->extra1; | |
2950 | delay = net->ipv6.sysctl.flush_delay; | |
2951 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 2952 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 2953 | return 0; |
1da177e4 LT |
2954 | } |
2955 | ||
fe2c6338 | 2956 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2957 | { |
1da177e4 | 2958 | .procname = "flush", |
4990509f | 2959 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2960 | .maxlen = sizeof(int), |
89c8b3a1 | 2961 | .mode = 0200, |
6d9f239a | 2962 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2963 | }, |
2964 | { | |
1da177e4 | 2965 | .procname = "gc_thresh", |
9a7ec3a9 | 2966 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2967 | .maxlen = sizeof(int), |
2968 | .mode = 0644, | |
6d9f239a | 2969 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2970 | }, |
2971 | { | |
1da177e4 | 2972 | .procname = "max_size", |
4990509f | 2973 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2974 | .maxlen = sizeof(int), |
2975 | .mode = 0644, | |
6d9f239a | 2976 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2977 | }, |
2978 | { | |
1da177e4 | 2979 | .procname = "gc_min_interval", |
4990509f | 2980 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2981 | .maxlen = sizeof(int), |
2982 | .mode = 0644, | |
6d9f239a | 2983 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2984 | }, |
2985 | { | |
1da177e4 | 2986 | .procname = "gc_timeout", |
4990509f | 2987 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2988 | .maxlen = sizeof(int), |
2989 | .mode = 0644, | |
6d9f239a | 2990 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2991 | }, |
2992 | { | |
1da177e4 | 2993 | .procname = "gc_interval", |
4990509f | 2994 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2995 | .maxlen = sizeof(int), |
2996 | .mode = 0644, | |
6d9f239a | 2997 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2998 | }, |
2999 | { | |
1da177e4 | 3000 | .procname = "gc_elasticity", |
4990509f | 3001 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
3002 | .maxlen = sizeof(int), |
3003 | .mode = 0644, | |
f3d3f616 | 3004 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3005 | }, |
3006 | { | |
1da177e4 | 3007 | .procname = "mtu_expires", |
4990509f | 3008 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
3009 | .maxlen = sizeof(int), |
3010 | .mode = 0644, | |
6d9f239a | 3011 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3012 | }, |
3013 | { | |
1da177e4 | 3014 | .procname = "min_adv_mss", |
4990509f | 3015 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
3016 | .maxlen = sizeof(int), |
3017 | .mode = 0644, | |
f3d3f616 | 3018 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3019 | }, |
3020 | { | |
1da177e4 | 3021 | .procname = "gc_min_interval_ms", |
4990509f | 3022 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3023 | .maxlen = sizeof(int), |
3024 | .mode = 0644, | |
6d9f239a | 3025 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 3026 | }, |
f8572d8f | 3027 | { } |
1da177e4 LT |
3028 | }; |
3029 | ||
2c8c1e72 | 3030 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
3031 | { |
3032 | struct ctl_table *table; | |
3033 | ||
3034 | table = kmemdup(ipv6_route_table_template, | |
3035 | sizeof(ipv6_route_table_template), | |
3036 | GFP_KERNEL); | |
5ee09105 YH |
3037 | |
3038 | if (table) { | |
3039 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 3040 | table[0].extra1 = net; |
86393e52 | 3041 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
3042 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
3043 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
3044 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3045 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
3046 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3047 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
3048 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 3049 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
3050 | |
3051 | /* Don't export sysctls to unprivileged users */ | |
3052 | if (net->user_ns != &init_user_ns) | |
3053 | table[0].procname = NULL; | |
5ee09105 YH |
3054 | } |
3055 | ||
760f2d01 DL |
3056 | return table; |
3057 | } | |
1da177e4 LT |
3058 | #endif |
3059 | ||
2c8c1e72 | 3060 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 3061 | { |
633d424b | 3062 | int ret = -ENOMEM; |
8ed67789 | 3063 | |
86393e52 AD |
3064 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
3065 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 3066 | |
fc66f95c ED |
3067 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
3068 | goto out_ip6_dst_ops; | |
3069 | ||
8ed67789 DL |
3070 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
3071 | sizeof(*net->ipv6.ip6_null_entry), | |
3072 | GFP_KERNEL); | |
3073 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 3074 | goto out_ip6_dst_entries; |
d8d1f30b | 3075 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 3076 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 3077 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3078 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
3079 | ip6_template_metrics, true); | |
8ed67789 DL |
3080 | |
3081 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3082 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
3083 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
3084 | GFP_KERNEL); | |
68fffc67 PZ |
3085 | if (!net->ipv6.ip6_prohibit_entry) |
3086 | goto out_ip6_null_entry; | |
d8d1f30b | 3087 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 3088 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 3089 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3090 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
3091 | ip6_template_metrics, true); | |
8ed67789 DL |
3092 | |
3093 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
3094 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
3095 | GFP_KERNEL); | |
68fffc67 PZ |
3096 | if (!net->ipv6.ip6_blk_hole_entry) |
3097 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 3098 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 3099 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 3100 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3101 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
3102 | ip6_template_metrics, true); | |
8ed67789 DL |
3103 | #endif |
3104 | ||
b339a47c PZ |
3105 | net->ipv6.sysctl.flush_delay = 0; |
3106 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3107 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3108 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3109 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3110 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
3111 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
3112 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
3113 | ||
6891a346 BT |
3114 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
3115 | ||
8ed67789 DL |
3116 | ret = 0; |
3117 | out: | |
3118 | return ret; | |
f2fc6a54 | 3119 | |
68fffc67 PZ |
3120 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
3121 | out_ip6_prohibit_entry: | |
3122 | kfree(net->ipv6.ip6_prohibit_entry); | |
3123 | out_ip6_null_entry: | |
3124 | kfree(net->ipv6.ip6_null_entry); | |
3125 | #endif | |
fc66f95c ED |
3126 | out_ip6_dst_entries: |
3127 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3128 | out_ip6_dst_ops: |
f2fc6a54 | 3129 | goto out; |
cdb18761 DL |
3130 | } |
3131 | ||
2c8c1e72 | 3132 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3133 | { |
8ed67789 DL |
3134 | kfree(net->ipv6.ip6_null_entry); |
3135 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3136 | kfree(net->ipv6.ip6_prohibit_entry); | |
3137 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3138 | #endif | |
41bb78b4 | 3139 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3140 | } |
3141 | ||
d189634e TG |
3142 | static int __net_init ip6_route_net_init_late(struct net *net) |
3143 | { | |
3144 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
3145 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
3146 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3147 | #endif |
3148 | return 0; | |
3149 | } | |
3150 | ||
3151 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3152 | { | |
3153 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3154 | remove_proc_entry("ipv6_route", net->proc_net); |
3155 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3156 | #endif |
3157 | } | |
3158 | ||
cdb18761 DL |
3159 | static struct pernet_operations ip6_route_net_ops = { |
3160 | .init = ip6_route_net_init, | |
3161 | .exit = ip6_route_net_exit, | |
3162 | }; | |
3163 | ||
c3426b47 DM |
3164 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3165 | { | |
3166 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3167 | ||
3168 | if (!bp) | |
3169 | return -ENOMEM; | |
3170 | inet_peer_base_init(bp); | |
3171 | net->ipv6.peers = bp; | |
3172 | return 0; | |
3173 | } | |
3174 | ||
3175 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3176 | { | |
3177 | struct inet_peer_base *bp = net->ipv6.peers; | |
3178 | ||
3179 | net->ipv6.peers = NULL; | |
56a6b248 | 3180 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3181 | kfree(bp); |
3182 | } | |
3183 | ||
2b823f72 | 3184 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3185 | .init = ipv6_inetpeer_init, |
3186 | .exit = ipv6_inetpeer_exit, | |
3187 | }; | |
3188 | ||
d189634e TG |
3189 | static struct pernet_operations ip6_route_net_late_ops = { |
3190 | .init = ip6_route_net_init_late, | |
3191 | .exit = ip6_route_net_exit_late, | |
3192 | }; | |
3193 | ||
8ed67789 DL |
3194 | static struct notifier_block ip6_route_dev_notifier = { |
3195 | .notifier_call = ip6_route_dev_notify, | |
3196 | .priority = 0, | |
3197 | }; | |
3198 | ||
433d49c3 | 3199 | int __init ip6_route_init(void) |
1da177e4 | 3200 | { |
433d49c3 DL |
3201 | int ret; |
3202 | ||
9a7ec3a9 DL |
3203 | ret = -ENOMEM; |
3204 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3205 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3206 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3207 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3208 | goto out; |
14e50e57 | 3209 | |
fc66f95c | 3210 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3211 | if (ret) |
bdb3289f | 3212 | goto out_kmem_cache; |
bdb3289f | 3213 | |
c3426b47 DM |
3214 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3215 | if (ret) | |
e8803b6c | 3216 | goto out_dst_entries; |
2a0c451a | 3217 | |
7e52b33b DM |
3218 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3219 | if (ret) | |
3220 | goto out_register_inetpeer; | |
c3426b47 | 3221 | |
5dc121e9 AE |
3222 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3223 | ||
8ed67789 DL |
3224 | /* Registering of the loopback is done before this portion of code, |
3225 | * the loopback reference in rt6_info will not be taken, do it | |
3226 | * manually for init_net */ | |
d8d1f30b | 3227 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3228 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3229 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3230 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3231 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3232 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3233 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3234 | #endif | |
e8803b6c | 3235 | ret = fib6_init(); |
433d49c3 | 3236 | if (ret) |
8ed67789 | 3237 | goto out_register_subsys; |
433d49c3 | 3238 | |
433d49c3 DL |
3239 | ret = xfrm6_init(); |
3240 | if (ret) | |
e8803b6c | 3241 | goto out_fib6_init; |
c35b7e72 | 3242 | |
433d49c3 DL |
3243 | ret = fib6_rules_init(); |
3244 | if (ret) | |
3245 | goto xfrm6_init; | |
7e5449c2 | 3246 | |
d189634e TG |
3247 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3248 | if (ret) | |
3249 | goto fib6_rules_init; | |
3250 | ||
433d49c3 | 3251 | ret = -ENOBUFS; |
c7ac8679 GR |
3252 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3253 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3254 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3255 | goto out_register_late_subsys; |
c127ea2c | 3256 | |
8ed67789 | 3257 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3258 | if (ret) |
d189634e | 3259 | goto out_register_late_subsys; |
8ed67789 | 3260 | |
433d49c3 DL |
3261 | out: |
3262 | return ret; | |
3263 | ||
d189634e TG |
3264 | out_register_late_subsys: |
3265 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3266 | fib6_rules_init: |
433d49c3 DL |
3267 | fib6_rules_cleanup(); |
3268 | xfrm6_init: | |
433d49c3 | 3269 | xfrm6_fini(); |
2a0c451a TG |
3270 | out_fib6_init: |
3271 | fib6_gc_cleanup(); | |
8ed67789 DL |
3272 | out_register_subsys: |
3273 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3274 | out_register_inetpeer: |
3275 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3276 | out_dst_entries: |
3277 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3278 | out_kmem_cache: |
f2fc6a54 | 3279 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3280 | goto out; |
1da177e4 LT |
3281 | } |
3282 | ||
3283 | void ip6_route_cleanup(void) | |
3284 | { | |
8ed67789 | 3285 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3286 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3287 | fib6_rules_cleanup(); |
1da177e4 | 3288 | xfrm6_fini(); |
1da177e4 | 3289 | fib6_gc_cleanup(); |
c3426b47 | 3290 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3291 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3292 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3293 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3294 | } |