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 | ||
b4f1489e HFS |
68 | enum rt6_nud_state { |
69 | RT6_NUD_FAIL_HARD = -2, | |
70 | RT6_NUD_FAIL_SOFT = -1, | |
71 | RT6_NUD_SUCCEED = 1 | |
72 | }; | |
73 | ||
1716a961 | 74 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 75 | const struct in6_addr *dest); |
1da177e4 | 76 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 77 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 78 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
79 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
80 | static void ip6_dst_destroy(struct dst_entry *); | |
81 | static void ip6_dst_ifdown(struct dst_entry *, | |
82 | struct net_device *dev, int how); | |
569d3645 | 83 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
84 | |
85 | static int ip6_pkt_discard(struct sk_buff *skb); | |
86 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
87 | static void ip6_link_failure(struct sk_buff *skb); | |
6700c270 DM |
88 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
89 | struct sk_buff *skb, u32 mtu); | |
90 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
91 | struct sk_buff *skb); | |
1da177e4 | 92 | |
70ceb4f5 | 93 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 94 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
95 | const struct in6_addr *prefix, int prefixlen, |
96 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 97 | unsigned int pref); |
efa2cea0 | 98 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
99 | const struct in6_addr *prefix, int prefixlen, |
100 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
101 | #endif |
102 | ||
06582540 DM |
103 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
104 | { | |
105 | struct rt6_info *rt = (struct rt6_info *) dst; | |
106 | struct inet_peer *peer; | |
107 | u32 *p = NULL; | |
108 | ||
8e2ec639 YZ |
109 | if (!(rt->dst.flags & DST_HOST)) |
110 | return NULL; | |
111 | ||
fbfe95a4 | 112 | peer = rt6_get_peer_create(rt); |
06582540 DM |
113 | if (peer) { |
114 | u32 *old_p = __DST_METRICS_PTR(old); | |
115 | unsigned long prev, new; | |
116 | ||
117 | p = peer->metrics; | |
118 | if (inet_metrics_new(peer)) | |
119 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
120 | ||
121 | new = (unsigned long) p; | |
122 | prev = cmpxchg(&dst->_metrics, old, new); | |
123 | ||
124 | if (prev != old) { | |
125 | p = __DST_METRICS_PTR(prev); | |
126 | if (prev & DST_METRICS_READ_ONLY) | |
127 | p = NULL; | |
128 | } | |
129 | } | |
130 | return p; | |
131 | } | |
132 | ||
f894cbf8 DM |
133 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
134 | struct sk_buff *skb, | |
135 | const void *daddr) | |
39232973 DM |
136 | { |
137 | struct in6_addr *p = &rt->rt6i_gateway; | |
138 | ||
a7563f34 | 139 | if (!ipv6_addr_any(p)) |
39232973 | 140 | return (const void *) p; |
f894cbf8 DM |
141 | else if (skb) |
142 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
143 | return daddr; |
144 | } | |
145 | ||
f894cbf8 DM |
146 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
147 | struct sk_buff *skb, | |
148 | const void *daddr) | |
d3aaeb38 | 149 | { |
39232973 DM |
150 | struct rt6_info *rt = (struct rt6_info *) dst; |
151 | struct neighbour *n; | |
152 | ||
f894cbf8 | 153 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 154 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
155 | if (n) |
156 | return n; | |
157 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
158 | } | |
159 | ||
9a7ec3a9 | 160 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 161 | .family = AF_INET6, |
09640e63 | 162 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
163 | .gc = ip6_dst_gc, |
164 | .gc_thresh = 1024, | |
165 | .check = ip6_dst_check, | |
0dbaee3b | 166 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 167 | .mtu = ip6_mtu, |
06582540 | 168 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
169 | .destroy = ip6_dst_destroy, |
170 | .ifdown = ip6_dst_ifdown, | |
171 | .negative_advice = ip6_negative_advice, | |
172 | .link_failure = ip6_link_failure, | |
173 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 174 | .redirect = rt6_do_redirect, |
1ac06e03 | 175 | .local_out = __ip6_local_out, |
d3aaeb38 | 176 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
177 | }; |
178 | ||
ebb762f2 | 179 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 180 | { |
618f9bc7 SK |
181 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
182 | ||
183 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
184 | } |
185 | ||
6700c270 DM |
186 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
187 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
188 | { |
189 | } | |
190 | ||
6700c270 DM |
191 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
192 | struct sk_buff *skb) | |
b587ee3b DM |
193 | { |
194 | } | |
195 | ||
0972ddb2 HB |
196 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
197 | unsigned long old) | |
198 | { | |
199 | return NULL; | |
200 | } | |
201 | ||
14e50e57 DM |
202 | static struct dst_ops ip6_dst_blackhole_ops = { |
203 | .family = AF_INET6, | |
09640e63 | 204 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
205 | .destroy = ip6_dst_destroy, |
206 | .check = ip6_dst_check, | |
ebb762f2 | 207 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 208 | .default_advmss = ip6_default_advmss, |
14e50e57 | 209 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 210 | .redirect = ip6_rt_blackhole_redirect, |
0972ddb2 | 211 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 212 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
213 | }; |
214 | ||
62fa8a84 | 215 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 216 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
217 | }; |
218 | ||
fb0af4c7 | 219 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
220 | .dst = { |
221 | .__refcnt = ATOMIC_INIT(1), | |
222 | .__use = 1, | |
2c20cbd7 | 223 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 224 | .error = -ENETUNREACH, |
d8d1f30b CG |
225 | .input = ip6_pkt_discard, |
226 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
227 | }, |
228 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 229 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
230 | .rt6i_metric = ~(u32) 0, |
231 | .rt6i_ref = ATOMIC_INIT(1), | |
232 | }; | |
233 | ||
101367c2 TG |
234 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
235 | ||
6723ab54 DM |
236 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
237 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 238 | |
fb0af4c7 | 239 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
240 | .dst = { |
241 | .__refcnt = ATOMIC_INIT(1), | |
242 | .__use = 1, | |
2c20cbd7 | 243 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 244 | .error = -EACCES, |
d8d1f30b CG |
245 | .input = ip6_pkt_prohibit, |
246 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
247 | }, |
248 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 249 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
250 | .rt6i_metric = ~(u32) 0, |
251 | .rt6i_ref = ATOMIC_INIT(1), | |
252 | }; | |
253 | ||
fb0af4c7 | 254 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
255 | .dst = { |
256 | .__refcnt = ATOMIC_INIT(1), | |
257 | .__use = 1, | |
2c20cbd7 | 258 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 259 | .error = -EINVAL, |
d8d1f30b CG |
260 | .input = dst_discard, |
261 | .output = dst_discard, | |
101367c2 TG |
262 | }, |
263 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 264 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
265 | .rt6i_metric = ~(u32) 0, |
266 | .rt6i_ref = ATOMIC_INIT(1), | |
267 | }; | |
268 | ||
269 | #endif | |
270 | ||
1da177e4 | 271 | /* allocate dst with ip6_dst_ops */ |
97bab73f | 272 | static inline struct rt6_info *ip6_dst_alloc(struct net *net, |
957c665f | 273 | struct net_device *dev, |
8b96d22d DM |
274 | int flags, |
275 | struct fib6_table *table) | |
1da177e4 | 276 | { |
97bab73f | 277 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 278 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 279 | |
97bab73f | 280 | if (rt) { |
8104891b SK |
281 | struct dst_entry *dst = &rt->dst; |
282 | ||
283 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
8b96d22d | 284 | rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers); |
6f3118b5 | 285 | rt->rt6i_genid = rt_genid(net); |
51ebd318 ND |
286 | INIT_LIST_HEAD(&rt->rt6i_siblings); |
287 | rt->rt6i_nsiblings = 0; | |
97bab73f | 288 | } |
cf911662 | 289 | return rt; |
1da177e4 LT |
290 | } |
291 | ||
292 | static void ip6_dst_destroy(struct dst_entry *dst) | |
293 | { | |
294 | struct rt6_info *rt = (struct rt6_info *)dst; | |
295 | struct inet6_dev *idev = rt->rt6i_idev; | |
ecd98837 | 296 | struct dst_entry *from = dst->from; |
1da177e4 | 297 | |
8e2ec639 YZ |
298 | if (!(rt->dst.flags & DST_HOST)) |
299 | dst_destroy_metrics_generic(dst); | |
300 | ||
38308473 | 301 | if (idev) { |
1da177e4 LT |
302 | rt->rt6i_idev = NULL; |
303 | in6_dev_put(idev); | |
1ab1457c | 304 | } |
1716a961 | 305 | |
ecd98837 YH |
306 | dst->from = NULL; |
307 | dst_release(from); | |
1716a961 | 308 | |
97bab73f DM |
309 | if (rt6_has_peer(rt)) { |
310 | struct inet_peer *peer = rt6_peer_ptr(rt); | |
b3419363 DM |
311 | inet_putpeer(peer); |
312 | } | |
313 | } | |
314 | ||
315 | void rt6_bind_peer(struct rt6_info *rt, int create) | |
316 | { | |
97bab73f | 317 | struct inet_peer_base *base; |
b3419363 DM |
318 | struct inet_peer *peer; |
319 | ||
97bab73f DM |
320 | base = inetpeer_base_ptr(rt->_rt6i_peer); |
321 | if (!base) | |
322 | return; | |
323 | ||
324 | peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create); | |
7b34ca2a DM |
325 | if (peer) { |
326 | if (!rt6_set_peer(rt, peer)) | |
327 | inet_putpeer(peer); | |
7b34ca2a | 328 | } |
1da177e4 LT |
329 | } |
330 | ||
331 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
332 | int how) | |
333 | { | |
334 | struct rt6_info *rt = (struct rt6_info *)dst; | |
335 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 336 | struct net_device *loopback_dev = |
c346dca1 | 337 | dev_net(dev)->loopback_dev; |
1da177e4 | 338 | |
97cac082 DM |
339 | if (dev != loopback_dev) { |
340 | if (idev && idev->dev == dev) { | |
341 | struct inet6_dev *loopback_idev = | |
342 | in6_dev_get(loopback_dev); | |
343 | if (loopback_idev) { | |
344 | rt->rt6i_idev = loopback_idev; | |
345 | in6_dev_put(idev); | |
346 | } | |
347 | } | |
1da177e4 LT |
348 | } |
349 | } | |
350 | ||
a50feda5 | 351 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 352 | { |
1716a961 G |
353 | if (rt->rt6i_flags & RTF_EXPIRES) { |
354 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 355 | return true; |
1716a961 | 356 | } else if (rt->dst.from) { |
3fd91fb3 | 357 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 358 | } |
a50feda5 | 359 | return false; |
1da177e4 LT |
360 | } |
361 | ||
a50feda5 | 362 | static bool rt6_need_strict(const struct in6_addr *daddr) |
c71099ac | 363 | { |
a02cec21 ED |
364 | return ipv6_addr_type(daddr) & |
365 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
366 | } |
367 | ||
51ebd318 ND |
368 | /* Multipath route selection: |
369 | * Hash based function using packet header and flowlabel. | |
370 | * Adapted from fib_info_hashfn() | |
371 | */ | |
372 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
373 | const struct flowi6 *fl6) | |
374 | { | |
375 | unsigned int val = fl6->flowi6_proto; | |
376 | ||
c08977bb YH |
377 | val ^= ipv6_addr_hash(&fl6->daddr); |
378 | val ^= ipv6_addr_hash(&fl6->saddr); | |
51ebd318 ND |
379 | |
380 | /* Work only if this not encapsulated */ | |
381 | switch (fl6->flowi6_proto) { | |
382 | case IPPROTO_UDP: | |
383 | case IPPROTO_TCP: | |
384 | case IPPROTO_SCTP: | |
b3ce5ae1 ND |
385 | val ^= (__force u16)fl6->fl6_sport; |
386 | val ^= (__force u16)fl6->fl6_dport; | |
51ebd318 ND |
387 | break; |
388 | ||
389 | case IPPROTO_ICMPV6: | |
b3ce5ae1 ND |
390 | val ^= (__force u16)fl6->fl6_icmp_type; |
391 | val ^= (__force u16)fl6->fl6_icmp_code; | |
51ebd318 ND |
392 | break; |
393 | } | |
394 | /* RFC6438 recommands to use flowlabel */ | |
b3ce5ae1 | 395 | val ^= (__force u32)fl6->flowlabel; |
51ebd318 ND |
396 | |
397 | /* Perhaps, we need to tune, this function? */ | |
398 | val = val ^ (val >> 7) ^ (val >> 12); | |
399 | return val % candidate_count; | |
400 | } | |
401 | ||
402 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
403 | struct flowi6 *fl6) | |
404 | { | |
405 | struct rt6_info *sibling, *next_sibling; | |
406 | int route_choosen; | |
407 | ||
408 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
409 | /* Don't change the route, if route_choosen == 0 | |
410 | * (siblings does not include ourself) | |
411 | */ | |
412 | if (route_choosen) | |
413 | list_for_each_entry_safe(sibling, next_sibling, | |
414 | &match->rt6i_siblings, rt6i_siblings) { | |
415 | route_choosen--; | |
416 | if (route_choosen == 0) { | |
417 | match = sibling; | |
418 | break; | |
419 | } | |
420 | } | |
421 | return match; | |
422 | } | |
423 | ||
1da177e4 | 424 | /* |
c71099ac | 425 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
426 | */ |
427 | ||
8ed67789 DL |
428 | static inline struct rt6_info *rt6_device_match(struct net *net, |
429 | struct rt6_info *rt, | |
b71d1d42 | 430 | const struct in6_addr *saddr, |
1da177e4 | 431 | int oif, |
d420895e | 432 | int flags) |
1da177e4 LT |
433 | { |
434 | struct rt6_info *local = NULL; | |
435 | struct rt6_info *sprt; | |
436 | ||
dd3abc4e YH |
437 | if (!oif && ipv6_addr_any(saddr)) |
438 | goto out; | |
439 | ||
d8d1f30b | 440 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 441 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
442 | |
443 | if (oif) { | |
1da177e4 LT |
444 | if (dev->ifindex == oif) |
445 | return sprt; | |
446 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 447 | if (!sprt->rt6i_idev || |
1da177e4 | 448 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 449 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 450 | continue; |
1ab1457c | 451 | if (local && (!oif || |
1da177e4 LT |
452 | local->rt6i_idev->dev->ifindex == oif)) |
453 | continue; | |
454 | } | |
455 | local = sprt; | |
456 | } | |
dd3abc4e YH |
457 | } else { |
458 | if (ipv6_chk_addr(net, saddr, dev, | |
459 | flags & RT6_LOOKUP_F_IFACE)) | |
460 | return sprt; | |
1da177e4 | 461 | } |
dd3abc4e | 462 | } |
1da177e4 | 463 | |
dd3abc4e | 464 | if (oif) { |
1da177e4 LT |
465 | if (local) |
466 | return local; | |
467 | ||
d420895e | 468 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 469 | return net->ipv6.ip6_null_entry; |
1da177e4 | 470 | } |
dd3abc4e | 471 | out: |
1da177e4 LT |
472 | return rt; |
473 | } | |
474 | ||
27097255 YH |
475 | #ifdef CONFIG_IPV6_ROUTER_PREF |
476 | static void rt6_probe(struct rt6_info *rt) | |
477 | { | |
f2c31e32 | 478 | struct neighbour *neigh; |
27097255 YH |
479 | /* |
480 | * Okay, this does not seem to be appropriate | |
481 | * for now, however, we need to check if it | |
482 | * is really so; aka Router Reachability Probing. | |
483 | * | |
484 | * Router Reachability Probe MUST be rate-limited | |
485 | * to no more than one per minute. | |
486 | */ | |
2152caea | 487 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 488 | return; |
2152caea YH |
489 | rcu_read_lock_bh(); |
490 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
491 | if (neigh) { | |
492 | write_lock(&neigh->lock); | |
493 | if (neigh->nud_state & NUD_VALID) | |
494 | goto out; | |
7ff74a59 | 495 | } |
2152caea YH |
496 | |
497 | if (!neigh || | |
52e16356 | 498 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
499 | struct in6_addr mcaddr; |
500 | struct in6_addr *target; | |
501 | ||
b820bb6b YH |
502 | if (neigh) { |
503 | neigh->updated = jiffies; | |
2152caea | 504 | write_unlock(&neigh->lock); |
b820bb6b | 505 | } |
2152caea YH |
506 | |
507 | target = (struct in6_addr *)&rt->rt6i_gateway; | |
27097255 | 508 | addrconf_addr_solict_mult(target, &mcaddr); |
d1918542 | 509 | ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL); |
f2c31e32 | 510 | } else { |
2152caea YH |
511 | out: |
512 | write_unlock(&neigh->lock); | |
f2c31e32 | 513 | } |
2152caea | 514 | rcu_read_unlock_bh(); |
27097255 YH |
515 | } |
516 | #else | |
517 | static inline void rt6_probe(struct rt6_info *rt) | |
518 | { | |
27097255 YH |
519 | } |
520 | #endif | |
521 | ||
1da177e4 | 522 | /* |
554cfb7e | 523 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 524 | */ |
b6f99a21 | 525 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 526 | { |
d1918542 | 527 | struct net_device *dev = rt->dst.dev; |
161980f4 | 528 | if (!oif || dev->ifindex == oif) |
554cfb7e | 529 | return 2; |
161980f4 DM |
530 | if ((dev->flags & IFF_LOOPBACK) && |
531 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
532 | return 1; | |
533 | return 0; | |
554cfb7e | 534 | } |
1da177e4 | 535 | |
b4f1489e | 536 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 537 | { |
f2c31e32 | 538 | struct neighbour *neigh; |
b4f1489e | 539 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 540 | |
4d0c5911 YH |
541 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
542 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
b4f1489e | 543 | return RT6_NUD_SUCCEED; |
145a3621 YH |
544 | |
545 | rcu_read_lock_bh(); | |
546 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
547 | if (neigh) { | |
548 | read_lock(&neigh->lock); | |
554cfb7e | 549 | if (neigh->nud_state & NUD_VALID) |
b4f1489e | 550 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 551 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 552 | else if (!(neigh->nud_state & NUD_FAILED)) |
b4f1489e | 553 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 554 | #endif |
145a3621 | 555 | read_unlock(&neigh->lock); |
b4f1489e HFS |
556 | } else { |
557 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
558 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_SOFT; | |
a5a81f0b | 559 | } |
145a3621 YH |
560 | rcu_read_unlock_bh(); |
561 | ||
a5a81f0b | 562 | return ret; |
1da177e4 LT |
563 | } |
564 | ||
554cfb7e YH |
565 | static int rt6_score_route(struct rt6_info *rt, int oif, |
566 | int strict) | |
1da177e4 | 567 | { |
a5a81f0b | 568 | int m; |
1ab1457c | 569 | |
4d0c5911 | 570 | m = rt6_check_dev(rt, oif); |
77d16f45 | 571 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
b4f1489e | 572 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
573 | #ifdef CONFIG_IPV6_ROUTER_PREF |
574 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
575 | #endif | |
b4f1489e HFS |
576 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
577 | int n = rt6_check_neigh(rt); | |
578 | if (n < 0) | |
579 | return n; | |
580 | } | |
554cfb7e YH |
581 | return m; |
582 | } | |
583 | ||
f11e6659 | 584 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
b4f1489e HFS |
585 | int *mpri, struct rt6_info *match, |
586 | bool *do_rr) | |
554cfb7e | 587 | { |
f11e6659 | 588 | int m; |
b4f1489e | 589 | bool match_do_rr = false; |
f11e6659 DM |
590 | |
591 | if (rt6_check_expired(rt)) | |
592 | goto out; | |
593 | ||
594 | m = rt6_score_route(rt, oif, strict); | |
b4f1489e HFS |
595 | if (m == RT6_NUD_FAIL_SOFT && !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF)) { |
596 | match_do_rr = true; | |
597 | m = 0; /* lowest valid score */ | |
598 | } else if (m < 0) { | |
f11e6659 | 599 | goto out; |
b4f1489e HFS |
600 | } |
601 | ||
602 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
603 | rt6_probe(rt); | |
f11e6659 DM |
604 | |
605 | if (m > *mpri) { | |
b4f1489e | 606 | *do_rr = match_do_rr; |
f11e6659 DM |
607 | *mpri = m; |
608 | match = rt; | |
f11e6659 | 609 | } |
f11e6659 DM |
610 | out: |
611 | return match; | |
612 | } | |
613 | ||
614 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
615 | struct rt6_info *rr_head, | |
b4f1489e HFS |
616 | u32 metric, int oif, int strict, |
617 | bool *do_rr) | |
f11e6659 DM |
618 | { |
619 | struct rt6_info *rt, *match; | |
554cfb7e | 620 | int mpri = -1; |
1da177e4 | 621 | |
f11e6659 DM |
622 | match = NULL; |
623 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 624 | rt = rt->dst.rt6_next) |
b4f1489e | 625 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
f11e6659 | 626 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; |
d8d1f30b | 627 | rt = rt->dst.rt6_next) |
b4f1489e | 628 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 629 | |
f11e6659 DM |
630 | return match; |
631 | } | |
1da177e4 | 632 | |
f11e6659 DM |
633 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
634 | { | |
635 | struct rt6_info *match, *rt0; | |
8ed67789 | 636 | struct net *net; |
b4f1489e | 637 | bool do_rr = false; |
1da177e4 | 638 | |
f11e6659 DM |
639 | rt0 = fn->rr_ptr; |
640 | if (!rt0) | |
641 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 642 | |
b4f1489e HFS |
643 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
644 | &do_rr); | |
1da177e4 | 645 | |
b4f1489e | 646 | if (do_rr) { |
d8d1f30b | 647 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 648 | |
554cfb7e | 649 | /* no entries matched; do round-robin */ |
f11e6659 DM |
650 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
651 | next = fn->leaf; | |
652 | ||
653 | if (next != rt0) | |
654 | fn->rr_ptr = next; | |
1da177e4 | 655 | } |
1da177e4 | 656 | |
d1918542 | 657 | net = dev_net(rt0->dst.dev); |
a02cec21 | 658 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
659 | } |
660 | ||
70ceb4f5 YH |
661 | #ifdef CONFIG_IPV6_ROUTE_INFO |
662 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 663 | const struct in6_addr *gwaddr) |
70ceb4f5 | 664 | { |
c346dca1 | 665 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
666 | struct route_info *rinfo = (struct route_info *) opt; |
667 | struct in6_addr prefix_buf, *prefix; | |
668 | unsigned int pref; | |
4bed72e4 | 669 | unsigned long lifetime; |
70ceb4f5 YH |
670 | struct rt6_info *rt; |
671 | ||
672 | if (len < sizeof(struct route_info)) { | |
673 | return -EINVAL; | |
674 | } | |
675 | ||
676 | /* Sanity check for prefix_len and length */ | |
677 | if (rinfo->length > 3) { | |
678 | return -EINVAL; | |
679 | } else if (rinfo->prefix_len > 128) { | |
680 | return -EINVAL; | |
681 | } else if (rinfo->prefix_len > 64) { | |
682 | if (rinfo->length < 2) { | |
683 | return -EINVAL; | |
684 | } | |
685 | } else if (rinfo->prefix_len > 0) { | |
686 | if (rinfo->length < 1) { | |
687 | return -EINVAL; | |
688 | } | |
689 | } | |
690 | ||
691 | pref = rinfo->route_pref; | |
692 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 693 | return -EINVAL; |
70ceb4f5 | 694 | |
4bed72e4 | 695 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
696 | |
697 | if (rinfo->length == 3) | |
698 | prefix = (struct in6_addr *)rinfo->prefix; | |
699 | else { | |
700 | /* this function is safe */ | |
701 | ipv6_addr_prefix(&prefix_buf, | |
702 | (struct in6_addr *)rinfo->prefix, | |
703 | rinfo->prefix_len); | |
704 | prefix = &prefix_buf; | |
705 | } | |
706 | ||
efa2cea0 DL |
707 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
708 | dev->ifindex); | |
70ceb4f5 YH |
709 | |
710 | if (rt && !lifetime) { | |
e0a1ad73 | 711 | ip6_del_rt(rt); |
70ceb4f5 YH |
712 | rt = NULL; |
713 | } | |
714 | ||
715 | if (!rt && lifetime) | |
efa2cea0 | 716 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
717 | pref); |
718 | else if (rt) | |
719 | rt->rt6i_flags = RTF_ROUTEINFO | | |
720 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
721 | ||
722 | if (rt) { | |
1716a961 G |
723 | if (!addrconf_finite_timeout(lifetime)) |
724 | rt6_clean_expires(rt); | |
725 | else | |
726 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
727 | ||
94e187c0 | 728 | ip6_rt_put(rt); |
70ceb4f5 YH |
729 | } |
730 | return 0; | |
731 | } | |
732 | #endif | |
733 | ||
8ed67789 | 734 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 735 | do { \ |
8ed67789 | 736 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 737 | struct fib6_node *pn; \ |
e0eda7bb | 738 | while (1) { \ |
982f56f3 YH |
739 | if (fn->fn_flags & RTN_TL_ROOT) \ |
740 | goto out; \ | |
741 | pn = fn->parent; \ | |
742 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 743 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
744 | else \ |
745 | fn = pn; \ | |
746 | if (fn->fn_flags & RTN_RTINFO) \ | |
747 | goto restart; \ | |
c71099ac | 748 | } \ |
c71099ac | 749 | } \ |
38308473 | 750 | } while (0) |
c71099ac | 751 | |
8ed67789 DL |
752 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
753 | struct fib6_table *table, | |
4c9483b2 | 754 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
755 | { |
756 | struct fib6_node *fn; | |
757 | struct rt6_info *rt; | |
758 | ||
c71099ac | 759 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 760 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
761 | restart: |
762 | rt = fn->leaf; | |
4c9483b2 | 763 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 ND |
764 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
765 | rt = rt6_multipath_select(rt, fl6); | |
4c9483b2 | 766 | BACKTRACK(net, &fl6->saddr); |
c71099ac | 767 | out: |
d8d1f30b | 768 | dst_use(&rt->dst, jiffies); |
c71099ac | 769 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
770 | return rt; |
771 | ||
772 | } | |
773 | ||
ea6e574e FW |
774 | struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
775 | int flags) | |
776 | { | |
777 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
778 | } | |
779 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
780 | ||
9acd9f3a YH |
781 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
782 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 783 | { |
4c9483b2 DM |
784 | struct flowi6 fl6 = { |
785 | .flowi6_oif = oif, | |
786 | .daddr = *daddr, | |
c71099ac TG |
787 | }; |
788 | struct dst_entry *dst; | |
77d16f45 | 789 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 790 | |
adaa70bb | 791 | if (saddr) { |
4c9483b2 | 792 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
793 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
794 | } | |
795 | ||
4c9483b2 | 796 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
797 | if (dst->error == 0) |
798 | return (struct rt6_info *) dst; | |
799 | ||
800 | dst_release(dst); | |
801 | ||
1da177e4 LT |
802 | return NULL; |
803 | } | |
804 | ||
7159039a YH |
805 | EXPORT_SYMBOL(rt6_lookup); |
806 | ||
c71099ac | 807 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
808 | It takes new route entry, the addition fails by any reason the |
809 | route is freed. In any case, if caller does not hold it, it may | |
810 | be destroyed. | |
811 | */ | |
812 | ||
86872cb5 | 813 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
814 | { |
815 | int err; | |
c71099ac | 816 | struct fib6_table *table; |
1da177e4 | 817 | |
c71099ac TG |
818 | table = rt->rt6i_table; |
819 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 820 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 821 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
822 | |
823 | return err; | |
824 | } | |
825 | ||
40e22e8f TG |
826 | int ip6_ins_rt(struct rt6_info *rt) |
827 | { | |
4d1169c1 | 828 | struct nl_info info = { |
d1918542 | 829 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 830 | }; |
528c4ceb | 831 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
832 | } |
833 | ||
1716a961 | 834 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, |
21efcfa0 | 835 | const struct in6_addr *daddr, |
b71d1d42 | 836 | const struct in6_addr *saddr) |
1da177e4 | 837 | { |
1da177e4 LT |
838 | struct rt6_info *rt; |
839 | ||
840 | /* | |
841 | * Clone the route. | |
842 | */ | |
843 | ||
21efcfa0 | 844 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
845 | |
846 | if (rt) { | |
38308473 | 847 | if (!(rt->rt6i_flags & RTF_GATEWAY)) { |
bb3c3686 | 848 | if (ort->rt6i_dst.plen != 128 && |
21efcfa0 | 849 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) |
58c4fb86 | 850 | rt->rt6i_flags |= RTF_ANYCAST; |
4e3fd7a0 | 851 | rt->rt6i_gateway = *daddr; |
58c4fb86 | 852 | } |
1da177e4 | 853 | |
1da177e4 | 854 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
855 | |
856 | #ifdef CONFIG_IPV6_SUBTREES | |
857 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 858 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
859 | rt->rt6i_src.plen = 128; |
860 | } | |
861 | #endif | |
95a9a5ba | 862 | } |
1da177e4 | 863 | |
95a9a5ba YH |
864 | return rt; |
865 | } | |
1da177e4 | 866 | |
21efcfa0 ED |
867 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
868 | const struct in6_addr *daddr) | |
299d9939 | 869 | { |
21efcfa0 ED |
870 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
871 | ||
887c95cc | 872 | if (rt) |
299d9939 | 873 | rt->rt6i_flags |= RTF_CACHE; |
299d9939 YH |
874 | return rt; |
875 | } | |
876 | ||
8ed67789 | 877 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 878 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
879 | { |
880 | struct fib6_node *fn; | |
519fbd87 | 881 | struct rt6_info *rt, *nrt; |
c71099ac | 882 | int strict = 0; |
1da177e4 | 883 | int attempts = 3; |
519fbd87 | 884 | int err; |
53b7997f | 885 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 886 | |
77d16f45 | 887 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
888 | |
889 | relookup: | |
c71099ac | 890 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 891 | |
8238dd06 | 892 | restart_2: |
4c9483b2 | 893 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
894 | |
895 | restart: | |
4acad72d | 896 | rt = rt6_select(fn, oif, strict | reachable); |
51ebd318 ND |
897 | if (rt->rt6i_nsiblings && oif == 0) |
898 | rt = rt6_multipath_select(rt, fl6); | |
4c9483b2 | 899 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 900 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 901 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 902 | goto out; |
1da177e4 | 903 | |
d8d1f30b | 904 | dst_hold(&rt->dst); |
c71099ac | 905 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 906 | |
c440f160 | 907 | if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY))) |
4c9483b2 | 908 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 909 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 910 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
911 | else |
912 | goto out2; | |
e40cf353 | 913 | |
94e187c0 | 914 | ip6_rt_put(rt); |
8ed67789 | 915 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 916 | |
d8d1f30b | 917 | dst_hold(&rt->dst); |
519fbd87 | 918 | if (nrt) { |
40e22e8f | 919 | err = ip6_ins_rt(nrt); |
519fbd87 | 920 | if (!err) |
1da177e4 | 921 | goto out2; |
1da177e4 | 922 | } |
1da177e4 | 923 | |
519fbd87 YH |
924 | if (--attempts <= 0) |
925 | goto out2; | |
926 | ||
927 | /* | |
c71099ac | 928 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
929 | * released someone could insert this route. Relookup. |
930 | */ | |
94e187c0 | 931 | ip6_rt_put(rt); |
519fbd87 YH |
932 | goto relookup; |
933 | ||
934 | out: | |
8238dd06 YH |
935 | if (reachable) { |
936 | reachable = 0; | |
937 | goto restart_2; | |
938 | } | |
d8d1f30b | 939 | dst_hold(&rt->dst); |
c71099ac | 940 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 941 | out2: |
d8d1f30b CG |
942 | rt->dst.lastuse = jiffies; |
943 | rt->dst.__use++; | |
c71099ac TG |
944 | |
945 | return rt; | |
1da177e4 LT |
946 | } |
947 | ||
8ed67789 | 948 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 949 | struct flowi6 *fl6, int flags) |
4acad72d | 950 | { |
4c9483b2 | 951 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
952 | } |
953 | ||
72331bc0 SL |
954 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
955 | struct net_device *dev, | |
956 | struct flowi6 *fl6, int flags) | |
957 | { | |
958 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
959 | flags |= RT6_LOOKUP_F_IFACE; | |
960 | ||
961 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
962 | } | |
963 | ||
c71099ac TG |
964 | void ip6_route_input(struct sk_buff *skb) |
965 | { | |
b71d1d42 | 966 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 967 | struct net *net = dev_net(skb->dev); |
adaa70bb | 968 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
969 | struct flowi6 fl6 = { |
970 | .flowi6_iif = skb->dev->ifindex, | |
971 | .daddr = iph->daddr, | |
972 | .saddr = iph->saddr, | |
6502ca52 | 973 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
974 | .flowi6_mark = skb->mark, |
975 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 976 | }; |
adaa70bb | 977 | |
72331bc0 | 978 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
979 | } |
980 | ||
8ed67789 | 981 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 982 | struct flowi6 *fl6, int flags) |
1da177e4 | 983 | { |
4c9483b2 | 984 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
985 | } |
986 | ||
9c7a4f9c | 987 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 988 | struct flowi6 *fl6) |
c71099ac TG |
989 | { |
990 | int flags = 0; | |
991 | ||
1fb9489b | 992 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 993 | |
4c9483b2 | 994 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 995 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 996 | |
4c9483b2 | 997 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 998 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
999 | else if (sk) |
1000 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1001 | |
4c9483b2 | 1002 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
1003 | } |
1004 | ||
7159039a | 1005 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 1006 | |
2774c131 | 1007 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1008 | { |
5c1e6aa3 | 1009 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1010 | struct dst_entry *new = NULL; |
1011 | ||
f5b0a874 | 1012 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1013 | if (rt) { |
d8d1f30b | 1014 | new = &rt->dst; |
14e50e57 | 1015 | |
8104891b SK |
1016 | memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); |
1017 | rt6_init_peer(rt, net->ipv6.peers); | |
1018 | ||
14e50e57 | 1019 | new->__use = 1; |
352e512c HX |
1020 | new->input = dst_discard; |
1021 | new->output = dst_discard; | |
14e50e57 | 1022 | |
21efcfa0 ED |
1023 | if (dst_metrics_read_only(&ort->dst)) |
1024 | new->_metrics = ort->dst._metrics; | |
1025 | else | |
1026 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
1027 | rt->rt6i_idev = ort->rt6i_idev; |
1028 | if (rt->rt6i_idev) | |
1029 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1030 | |
4e3fd7a0 | 1031 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 | 1032 | rt->rt6i_flags = ort->rt6i_flags; |
14e50e57 DM |
1033 | rt->rt6i_metric = 0; |
1034 | ||
1035 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1036 | #ifdef CONFIG_IPV6_SUBTREES | |
1037 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1038 | #endif | |
1039 | ||
1040 | dst_free(new); | |
1041 | } | |
1042 | ||
69ead7af DM |
1043 | dst_release(dst_orig); |
1044 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1045 | } |
14e50e57 | 1046 | |
1da177e4 LT |
1047 | /* |
1048 | * Destination cache support functions | |
1049 | */ | |
1050 | ||
1051 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
1052 | { | |
1053 | struct rt6_info *rt; | |
1054 | ||
1055 | rt = (struct rt6_info *) dst; | |
1056 | ||
6f3118b5 ND |
1057 | /* All IPV6 dsts are created with ->obsolete set to the value |
1058 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1059 | * into this function always. | |
1060 | */ | |
1061 | if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev))) | |
1062 | return NULL; | |
1063 | ||
a4477c4d | 1064 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) |
1da177e4 | 1065 | return dst; |
a4477c4d | 1066 | |
1da177e4 LT |
1067 | return NULL; |
1068 | } | |
1069 | ||
1070 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1071 | { | |
1072 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1073 | ||
1074 | if (rt) { | |
54c1a859 YH |
1075 | if (rt->rt6i_flags & RTF_CACHE) { |
1076 | if (rt6_check_expired(rt)) { | |
1077 | ip6_del_rt(rt); | |
1078 | dst = NULL; | |
1079 | } | |
1080 | } else { | |
1da177e4 | 1081 | dst_release(dst); |
54c1a859 YH |
1082 | dst = NULL; |
1083 | } | |
1da177e4 | 1084 | } |
54c1a859 | 1085 | return dst; |
1da177e4 LT |
1086 | } |
1087 | ||
1088 | static void ip6_link_failure(struct sk_buff *skb) | |
1089 | { | |
1090 | struct rt6_info *rt; | |
1091 | ||
3ffe533c | 1092 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1093 | |
adf30907 | 1094 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1095 | if (rt) { |
a025e28a HFS |
1096 | if (rt->rt6i_flags & RTF_CACHE) { |
1097 | dst_hold(&rt->dst); | |
1098 | if (ip6_del_rt(rt)) | |
1099 | dst_free(&rt->dst); | |
1100 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { | |
1da177e4 | 1101 | rt->rt6i_node->fn_sernum = -1; |
a025e28a | 1102 | } |
1da177e4 LT |
1103 | } |
1104 | } | |
1105 | ||
6700c270 DM |
1106 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1107 | struct sk_buff *skb, u32 mtu) | |
1da177e4 LT |
1108 | { |
1109 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
1110 | ||
81aded24 | 1111 | dst_confirm(dst); |
1da177e4 | 1112 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { |
81aded24 DM |
1113 | struct net *net = dev_net(dst->dev); |
1114 | ||
1da177e4 LT |
1115 | rt6->rt6i_flags |= RTF_MODIFIED; |
1116 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 1117 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 1118 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
1119 | features |= RTAX_FEATURE_ALLFRAG; |
1120 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 1121 | } |
defb3519 | 1122 | dst_metric_set(dst, RTAX_MTU, mtu); |
81aded24 | 1123 | rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1124 | } |
1125 | } | |
1126 | ||
42ae66c8 DM |
1127 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
1128 | int oif, u32 mark) | |
81aded24 DM |
1129 | { |
1130 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1131 | struct dst_entry *dst; | |
1132 | struct flowi6 fl6; | |
1133 | ||
1134 | memset(&fl6, 0, sizeof(fl6)); | |
1135 | fl6.flowi6_oif = oif; | |
1136 | fl6.flowi6_mark = mark; | |
3e12939a | 1137 | fl6.flowi6_flags = 0; |
81aded24 DM |
1138 | fl6.daddr = iph->daddr; |
1139 | fl6.saddr = iph->saddr; | |
6502ca52 | 1140 | fl6.flowlabel = ip6_flowinfo(iph); |
81aded24 DM |
1141 | |
1142 | dst = ip6_route_output(net, NULL, &fl6); | |
1143 | if (!dst->error) | |
6700c270 | 1144 | ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu)); |
81aded24 DM |
1145 | dst_release(dst); |
1146 | } | |
1147 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1148 | ||
1149 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1150 | { | |
1151 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
1152 | sk->sk_bound_dev_if, sk->sk_mark); | |
1153 | } | |
1154 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1155 | ||
3a5ad2ee DM |
1156 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1157 | { | |
1158 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1159 | struct dst_entry *dst; | |
1160 | struct flowi6 fl6; | |
1161 | ||
1162 | memset(&fl6, 0, sizeof(fl6)); | |
1163 | fl6.flowi6_oif = oif; | |
1164 | fl6.flowi6_mark = mark; | |
1165 | fl6.flowi6_flags = 0; | |
1166 | fl6.daddr = iph->daddr; | |
1167 | fl6.saddr = iph->saddr; | |
6502ca52 | 1168 | fl6.flowlabel = ip6_flowinfo(iph); |
3a5ad2ee DM |
1169 | |
1170 | dst = ip6_route_output(net, NULL, &fl6); | |
1171 | if (!dst->error) | |
6700c270 | 1172 | rt6_do_redirect(dst, NULL, skb); |
3a5ad2ee DM |
1173 | dst_release(dst); |
1174 | } | |
1175 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1176 | ||
1177 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1178 | { | |
1179 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1180 | } | |
1181 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1182 | ||
0dbaee3b | 1183 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1184 | { |
0dbaee3b DM |
1185 | struct net_device *dev = dst->dev; |
1186 | unsigned int mtu = dst_mtu(dst); | |
1187 | struct net *net = dev_net(dev); | |
1188 | ||
1da177e4 LT |
1189 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1190 | ||
5578689a DL |
1191 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1192 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1193 | |
1194 | /* | |
1ab1457c YH |
1195 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1196 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1197 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1198 | * rely only on pmtu discovery" |
1199 | */ | |
1200 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1201 | mtu = IPV6_MAXPLEN; | |
1202 | return mtu; | |
1203 | } | |
1204 | ||
ebb762f2 | 1205 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1206 | { |
d33e4553 | 1207 | struct inet6_dev *idev; |
618f9bc7 SK |
1208 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1209 | ||
1210 | if (mtu) | |
1211 | return mtu; | |
1212 | ||
1213 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1214 | |
1215 | rcu_read_lock(); | |
1216 | idev = __in6_dev_get(dst->dev); | |
1217 | if (idev) | |
1218 | mtu = idev->cnf.mtu6; | |
1219 | rcu_read_unlock(); | |
1220 | ||
1221 | return mtu; | |
1222 | } | |
1223 | ||
3b00944c YH |
1224 | static struct dst_entry *icmp6_dst_gc_list; |
1225 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1226 | |
3b00944c | 1227 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1228 | struct flowi6 *fl6) |
1da177e4 | 1229 | { |
87a11578 | 1230 | struct dst_entry *dst; |
1da177e4 LT |
1231 | struct rt6_info *rt; |
1232 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1233 | struct net *net = dev_net(dev); |
1da177e4 | 1234 | |
38308473 | 1235 | if (unlikely(!idev)) |
122bdf67 | 1236 | return ERR_PTR(-ENODEV); |
1da177e4 | 1237 | |
8b96d22d | 1238 | rt = ip6_dst_alloc(net, dev, 0, NULL); |
38308473 | 1239 | if (unlikely(!rt)) { |
1da177e4 | 1240 | in6_dev_put(idev); |
87a11578 | 1241 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1242 | goto out; |
1243 | } | |
1244 | ||
8e2ec639 YZ |
1245 | rt->dst.flags |= DST_HOST; |
1246 | rt->dst.output = ip6_output; | |
d8d1f30b | 1247 | atomic_set(&rt->dst.__refcnt, 1); |
87a11578 | 1248 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1249 | rt->rt6i_dst.plen = 128; |
1250 | rt->rt6i_idev = idev; | |
14edd87d | 1251 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1252 | |
3b00944c | 1253 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1254 | rt->dst.next = icmp6_dst_gc_list; |
1255 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1256 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1257 | |
5578689a | 1258 | fib6_force_start_gc(net); |
1da177e4 | 1259 | |
87a11578 DM |
1260 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1261 | ||
1da177e4 | 1262 | out: |
87a11578 | 1263 | return dst; |
1da177e4 LT |
1264 | } |
1265 | ||
3d0f24a7 | 1266 | int icmp6_dst_gc(void) |
1da177e4 | 1267 | { |
e9476e95 | 1268 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1269 | int more = 0; |
1da177e4 | 1270 | |
3b00944c YH |
1271 | spin_lock_bh(&icmp6_dst_lock); |
1272 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1273 | |
1da177e4 LT |
1274 | while ((dst = *pprev) != NULL) { |
1275 | if (!atomic_read(&dst->__refcnt)) { | |
1276 | *pprev = dst->next; | |
1277 | dst_free(dst); | |
1da177e4 LT |
1278 | } else { |
1279 | pprev = &dst->next; | |
3d0f24a7 | 1280 | ++more; |
1da177e4 LT |
1281 | } |
1282 | } | |
1283 | ||
3b00944c | 1284 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1285 | |
3d0f24a7 | 1286 | return more; |
1da177e4 LT |
1287 | } |
1288 | ||
1e493d19 DM |
1289 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1290 | void *arg) | |
1291 | { | |
1292 | struct dst_entry *dst, **pprev; | |
1293 | ||
1294 | spin_lock_bh(&icmp6_dst_lock); | |
1295 | pprev = &icmp6_dst_gc_list; | |
1296 | while ((dst = *pprev) != NULL) { | |
1297 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1298 | if (func(rt, arg)) { | |
1299 | *pprev = dst->next; | |
1300 | dst_free(dst); | |
1301 | } else { | |
1302 | pprev = &dst->next; | |
1303 | } | |
1304 | } | |
1305 | spin_unlock_bh(&icmp6_dst_lock); | |
1306 | } | |
1307 | ||
569d3645 | 1308 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1309 | { |
1da177e4 | 1310 | unsigned long now = jiffies; |
86393e52 | 1311 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1312 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1313 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1314 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1315 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1316 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1317 | int entries; |
7019b78e | 1318 | |
fc66f95c | 1319 | entries = dst_entries_get_fast(ops); |
7019b78e | 1320 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1321 | entries <= rt_max_size) |
1da177e4 LT |
1322 | goto out; |
1323 | ||
6891a346 BT |
1324 | net->ipv6.ip6_rt_gc_expire++; |
1325 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1326 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1327 | entries = dst_entries_get_slow(ops); |
1328 | if (entries < ops->gc_thresh) | |
7019b78e | 1329 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1330 | out: |
7019b78e | 1331 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1332 | return entries > rt_max_size; |
1da177e4 LT |
1333 | } |
1334 | ||
6b75d090 | 1335 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1336 | { |
5170ae82 | 1337 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1338 | if (hoplimit == 0) { |
6b75d090 | 1339 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1340 | struct inet6_dev *idev; |
1341 | ||
1342 | rcu_read_lock(); | |
1343 | idev = __in6_dev_get(dev); | |
1344 | if (idev) | |
6b75d090 | 1345 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1346 | else |
53b7997f | 1347 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1348 | rcu_read_unlock(); |
1da177e4 LT |
1349 | } |
1350 | return hoplimit; | |
1351 | } | |
abbf46ae | 1352 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1353 | |
1354 | /* | |
1355 | * | |
1356 | */ | |
1357 | ||
86872cb5 | 1358 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1359 | { |
1360 | int err; | |
5578689a | 1361 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1362 | struct rt6_info *rt = NULL; |
1363 | struct net_device *dev = NULL; | |
1364 | struct inet6_dev *idev = NULL; | |
c71099ac | 1365 | struct fib6_table *table; |
1da177e4 LT |
1366 | int addr_type; |
1367 | ||
86872cb5 | 1368 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1369 | return -EINVAL; |
1370 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1371 | if (cfg->fc_src_len) |
1da177e4 LT |
1372 | return -EINVAL; |
1373 | #endif | |
86872cb5 | 1374 | if (cfg->fc_ifindex) { |
1da177e4 | 1375 | err = -ENODEV; |
5578689a | 1376 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1377 | if (!dev) |
1378 | goto out; | |
1379 | idev = in6_dev_get(dev); | |
1380 | if (!idev) | |
1381 | goto out; | |
1382 | } | |
1383 | ||
86872cb5 TG |
1384 | if (cfg->fc_metric == 0) |
1385 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1386 | |
d71314b4 | 1387 | err = -ENOBUFS; |
38308473 DM |
1388 | if (cfg->fc_nlinfo.nlh && |
1389 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1390 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1391 | if (!table) { |
f3213831 | 1392 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1393 | table = fib6_new_table(net, cfg->fc_table); |
1394 | } | |
1395 | } else { | |
1396 | table = fib6_new_table(net, cfg->fc_table); | |
1397 | } | |
38308473 DM |
1398 | |
1399 | if (!table) | |
c71099ac | 1400 | goto out; |
c71099ac | 1401 | |
8b96d22d | 1402 | rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table); |
1da177e4 | 1403 | |
38308473 | 1404 | if (!rt) { |
1da177e4 LT |
1405 | err = -ENOMEM; |
1406 | goto out; | |
1407 | } | |
1408 | ||
1716a961 G |
1409 | if (cfg->fc_flags & RTF_EXPIRES) |
1410 | rt6_set_expires(rt, jiffies + | |
1411 | clock_t_to_jiffies(cfg->fc_expires)); | |
1412 | else | |
1413 | rt6_clean_expires(rt); | |
1da177e4 | 1414 | |
86872cb5 TG |
1415 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1416 | cfg->fc_protocol = RTPROT_BOOT; | |
1417 | rt->rt6i_protocol = cfg->fc_protocol; | |
1418 | ||
1419 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1420 | |
1421 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1422 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1423 | else if (cfg->fc_flags & RTF_LOCAL) |
1424 | rt->dst.input = ip6_input; | |
1da177e4 | 1425 | else |
d8d1f30b | 1426 | rt->dst.input = ip6_forward; |
1da177e4 | 1427 | |
d8d1f30b | 1428 | rt->dst.output = ip6_output; |
1da177e4 | 1429 | |
86872cb5 TG |
1430 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1431 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1432 | if (rt->rt6i_dst.plen == 128) |
11d53b49 | 1433 | rt->dst.flags |= DST_HOST; |
1da177e4 | 1434 | |
8e2ec639 YZ |
1435 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
1436 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1437 | if (!metrics) { | |
1438 | err = -ENOMEM; | |
1439 | goto out; | |
1440 | } | |
1441 | dst_init_metrics(&rt->dst, metrics, 0); | |
1442 | } | |
1da177e4 | 1443 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1444 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1445 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1446 | #endif |
1447 | ||
86872cb5 | 1448 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1449 | |
1450 | /* We cannot add true routes via loopback here, | |
1451 | they would result in kernel looping; promote them to reject routes | |
1452 | */ | |
86872cb5 | 1453 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1454 | (dev && (dev->flags & IFF_LOOPBACK) && |
1455 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1456 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1457 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1458 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1459 | if (dev) { |
1460 | dev_put(dev); | |
1461 | in6_dev_put(idev); | |
1462 | } | |
5578689a | 1463 | dev = net->loopback_dev; |
1da177e4 LT |
1464 | dev_hold(dev); |
1465 | idev = in6_dev_get(dev); | |
1466 | if (!idev) { | |
1467 | err = -ENODEV; | |
1468 | goto out; | |
1469 | } | |
1470 | } | |
d8d1f30b CG |
1471 | rt->dst.output = ip6_pkt_discard_out; |
1472 | rt->dst.input = ip6_pkt_discard; | |
1da177e4 | 1473 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1474 | switch (cfg->fc_type) { |
1475 | case RTN_BLACKHOLE: | |
1476 | rt->dst.error = -EINVAL; | |
1477 | break; | |
1478 | case RTN_PROHIBIT: | |
1479 | rt->dst.error = -EACCES; | |
1480 | break; | |
b4949ab2 ND |
1481 | case RTN_THROW: |
1482 | rt->dst.error = -EAGAIN; | |
1483 | break; | |
ef2c7d7b ND |
1484 | default: |
1485 | rt->dst.error = -ENETUNREACH; | |
1486 | break; | |
1487 | } | |
1da177e4 LT |
1488 | goto install_route; |
1489 | } | |
1490 | ||
86872cb5 | 1491 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1492 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1493 | int gwa_type; |
1494 | ||
86872cb5 | 1495 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1496 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1497 | gwa_type = ipv6_addr_type(gw_addr); |
1498 | ||
1499 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1500 | struct rt6_info *grt; | |
1501 | ||
1502 | /* IPv6 strictly inhibits using not link-local | |
1503 | addresses as nexthop address. | |
1504 | Otherwise, router will not able to send redirects. | |
1505 | It is very good, but in some (rare!) circumstances | |
1506 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1507 | some exceptions. --ANK | |
1508 | */ | |
1509 | err = -EINVAL; | |
38308473 | 1510 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1511 | goto out; |
1512 | ||
5578689a | 1513 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1514 | |
1515 | err = -EHOSTUNREACH; | |
38308473 | 1516 | if (!grt) |
1da177e4 LT |
1517 | goto out; |
1518 | if (dev) { | |
d1918542 | 1519 | if (dev != grt->dst.dev) { |
94e187c0 | 1520 | ip6_rt_put(grt); |
1da177e4 LT |
1521 | goto out; |
1522 | } | |
1523 | } else { | |
d1918542 | 1524 | dev = grt->dst.dev; |
1da177e4 LT |
1525 | idev = grt->rt6i_idev; |
1526 | dev_hold(dev); | |
1527 | in6_dev_hold(grt->rt6i_idev); | |
1528 | } | |
38308473 | 1529 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1530 | err = 0; |
94e187c0 | 1531 | ip6_rt_put(grt); |
1da177e4 LT |
1532 | |
1533 | if (err) | |
1534 | goto out; | |
1535 | } | |
1536 | err = -EINVAL; | |
38308473 | 1537 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1538 | goto out; |
1539 | } | |
1540 | ||
1541 | err = -ENODEV; | |
38308473 | 1542 | if (!dev) |
1da177e4 LT |
1543 | goto out; |
1544 | ||
c3968a85 DW |
1545 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1546 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1547 | err = -EINVAL; | |
1548 | goto out; | |
1549 | } | |
4e3fd7a0 | 1550 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1551 | rt->rt6i_prefsrc.plen = 128; |
1552 | } else | |
1553 | rt->rt6i_prefsrc.plen = 0; | |
1554 | ||
86872cb5 | 1555 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1556 | |
1557 | install_route: | |
86872cb5 TG |
1558 | if (cfg->fc_mx) { |
1559 | struct nlattr *nla; | |
1560 | int remaining; | |
1561 | ||
1562 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1563 | int type = nla_type(nla); |
86872cb5 TG |
1564 | |
1565 | if (type) { | |
1566 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1567 | err = -EINVAL; |
1568 | goto out; | |
1569 | } | |
86872cb5 | 1570 | |
defb3519 | 1571 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1572 | } |
1da177e4 LT |
1573 | } |
1574 | } | |
1575 | ||
d8d1f30b | 1576 | rt->dst.dev = dev; |
1da177e4 | 1577 | rt->rt6i_idev = idev; |
c71099ac | 1578 | rt->rt6i_table = table; |
63152fc0 | 1579 | |
c346dca1 | 1580 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1581 | |
86872cb5 | 1582 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1583 | |
1584 | out: | |
1585 | if (dev) | |
1586 | dev_put(dev); | |
1587 | if (idev) | |
1588 | in6_dev_put(idev); | |
1589 | if (rt) | |
d8d1f30b | 1590 | dst_free(&rt->dst); |
1da177e4 LT |
1591 | return err; |
1592 | } | |
1593 | ||
86872cb5 | 1594 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1595 | { |
1596 | int err; | |
c71099ac | 1597 | struct fib6_table *table; |
d1918542 | 1598 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1599 | |
6825a26c G |
1600 | if (rt == net->ipv6.ip6_null_entry) { |
1601 | err = -ENOENT; | |
1602 | goto out; | |
1603 | } | |
6c813a72 | 1604 | |
c71099ac TG |
1605 | table = rt->rt6i_table; |
1606 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 1607 | err = fib6_del(rt, info); |
c71099ac | 1608 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 1609 | |
6825a26c | 1610 | out: |
94e187c0 | 1611 | ip6_rt_put(rt); |
1da177e4 LT |
1612 | return err; |
1613 | } | |
1614 | ||
e0a1ad73 TG |
1615 | int ip6_del_rt(struct rt6_info *rt) |
1616 | { | |
4d1169c1 | 1617 | struct nl_info info = { |
d1918542 | 1618 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1619 | }; |
528c4ceb | 1620 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1621 | } |
1622 | ||
86872cb5 | 1623 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1624 | { |
c71099ac | 1625 | struct fib6_table *table; |
1da177e4 LT |
1626 | struct fib6_node *fn; |
1627 | struct rt6_info *rt; | |
1628 | int err = -ESRCH; | |
1629 | ||
5578689a | 1630 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1631 | if (!table) |
c71099ac TG |
1632 | return err; |
1633 | ||
1634 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1635 | |
c71099ac | 1636 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1637 | &cfg->fc_dst, cfg->fc_dst_len, |
1638 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1639 | |
1da177e4 | 1640 | if (fn) { |
d8d1f30b | 1641 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1642 | if (cfg->fc_ifindex && |
d1918542 DM |
1643 | (!rt->dst.dev || |
1644 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1645 | continue; |
86872cb5 TG |
1646 | if (cfg->fc_flags & RTF_GATEWAY && |
1647 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1648 | continue; |
86872cb5 | 1649 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1650 | continue; |
d8d1f30b | 1651 | dst_hold(&rt->dst); |
c71099ac | 1652 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1653 | |
86872cb5 | 1654 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1655 | } |
1656 | } | |
c71099ac | 1657 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1658 | |
1659 | return err; | |
1660 | } | |
1661 | ||
6700c270 | 1662 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 1663 | { |
e8599ff4 | 1664 | struct net *net = dev_net(skb->dev); |
a6279458 | 1665 | struct netevent_redirect netevent; |
e8599ff4 | 1666 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
1667 | struct ndisc_options ndopts; |
1668 | struct inet6_dev *in6_dev; | |
1669 | struct neighbour *neigh; | |
71bcdba0 | 1670 | struct rd_msg *msg; |
6e157b6a DM |
1671 | int optlen, on_link; |
1672 | u8 *lladdr; | |
e8599ff4 DM |
1673 | |
1674 | optlen = skb->tail - skb->transport_header; | |
71bcdba0 | 1675 | optlen -= sizeof(*msg); |
e8599ff4 DM |
1676 | |
1677 | if (optlen < 0) { | |
6e157b6a | 1678 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
1679 | return; |
1680 | } | |
1681 | ||
71bcdba0 | 1682 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 1683 | |
71bcdba0 | 1684 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 1685 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
1686 | return; |
1687 | } | |
1688 | ||
6e157b6a | 1689 | on_link = 0; |
71bcdba0 | 1690 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 1691 | on_link = 1; |
71bcdba0 | 1692 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 1693 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 1694 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
1695 | return; |
1696 | } | |
1697 | ||
1698 | in6_dev = __in6_dev_get(skb->dev); | |
1699 | if (!in6_dev) | |
1700 | return; | |
1701 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
1702 | return; | |
1703 | ||
1704 | /* RFC2461 8.1: | |
1705 | * The IP source address of the Redirect MUST be the same as the current | |
1706 | * first-hop router for the specified ICMP Destination Address. | |
1707 | */ | |
1708 | ||
71bcdba0 | 1709 | if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
1710 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
1711 | return; | |
1712 | } | |
6e157b6a DM |
1713 | |
1714 | lladdr = NULL; | |
e8599ff4 DM |
1715 | if (ndopts.nd_opts_tgt_lladdr) { |
1716 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1717 | skb->dev); | |
1718 | if (!lladdr) { | |
1719 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
1720 | return; | |
1721 | } | |
1722 | } | |
1723 | ||
6e157b6a DM |
1724 | rt = (struct rt6_info *) dst; |
1725 | if (rt == net->ipv6.ip6_null_entry) { | |
1726 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); | |
e8599ff4 | 1727 | return; |
6e157b6a | 1728 | } |
e8599ff4 | 1729 | |
6e157b6a DM |
1730 | /* Redirect received -> path was valid. |
1731 | * Look, redirects are sent only in response to data packets, | |
1732 | * so that this nexthop apparently is reachable. --ANK | |
1733 | */ | |
1734 | dst_confirm(&rt->dst); | |
a6279458 | 1735 | |
71bcdba0 | 1736 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
1737 | if (!neigh) |
1738 | return; | |
a6279458 | 1739 | |
1da177e4 LT |
1740 | /* |
1741 | * We have finally decided to accept it. | |
1742 | */ | |
1743 | ||
1ab1457c | 1744 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1745 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1746 | NEIGH_UPDATE_F_OVERRIDE| | |
1747 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1748 | NEIGH_UPDATE_F_ISROUTER)) | |
1749 | ); | |
1750 | ||
71bcdba0 | 1751 | nrt = ip6_rt_copy(rt, &msg->dest); |
38308473 | 1752 | if (!nrt) |
1da177e4 LT |
1753 | goto out; |
1754 | ||
1755 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1756 | if (on_link) | |
1757 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1758 | ||
4e3fd7a0 | 1759 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 1760 | |
40e22e8f | 1761 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1762 | goto out; |
1763 | ||
d8d1f30b CG |
1764 | netevent.old = &rt->dst; |
1765 | netevent.new = &nrt->dst; | |
71bcdba0 | 1766 | netevent.daddr = &msg->dest; |
60592833 | 1767 | netevent.neigh = neigh; |
8d71740c TT |
1768 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1769 | ||
38308473 | 1770 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 1771 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 1772 | ip6_del_rt(rt); |
1da177e4 LT |
1773 | } |
1774 | ||
1775 | out: | |
e8599ff4 | 1776 | neigh_release(neigh); |
6e157b6a DM |
1777 | } |
1778 | ||
1da177e4 LT |
1779 | /* |
1780 | * Misc support functions | |
1781 | */ | |
1782 | ||
1716a961 | 1783 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 1784 | const struct in6_addr *dest) |
1da177e4 | 1785 | { |
d1918542 | 1786 | struct net *net = dev_net(ort->dst.dev); |
8b96d22d DM |
1787 | struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0, |
1788 | ort->rt6i_table); | |
1da177e4 LT |
1789 | |
1790 | if (rt) { | |
d8d1f30b CG |
1791 | rt->dst.input = ort->dst.input; |
1792 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1793 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1794 | |
4e3fd7a0 | 1795 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1796 | rt->rt6i_dst.plen = 128; |
defb3519 | 1797 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1798 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1799 | rt->rt6i_idev = ort->rt6i_idev; |
1800 | if (rt->rt6i_idev) | |
1801 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1802 | rt->dst.lastuse = jiffies; |
1da177e4 | 1803 | |
4e3fd7a0 | 1804 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
1805 | rt->rt6i_flags = ort->rt6i_flags; |
1806 | if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) == | |
1807 | (RTF_DEFAULT | RTF_ADDRCONF)) | |
1808 | rt6_set_from(rt, ort); | |
1da177e4 LT |
1809 | rt->rt6i_metric = 0; |
1810 | ||
1da177e4 LT |
1811 | #ifdef CONFIG_IPV6_SUBTREES |
1812 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1813 | #endif | |
0f6c6392 | 1814 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1815 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1816 | } |
1817 | return rt; | |
1818 | } | |
1819 | ||
70ceb4f5 | 1820 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1821 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1822 | const struct in6_addr *prefix, int prefixlen, |
1823 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1824 | { |
1825 | struct fib6_node *fn; | |
1826 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1827 | struct fib6_table *table; |
1828 | ||
efa2cea0 | 1829 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 1830 | if (!table) |
c71099ac | 1831 | return NULL; |
70ceb4f5 | 1832 | |
5744dd9b | 1833 | read_lock_bh(&table->tb6_lock); |
c71099ac | 1834 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); |
70ceb4f5 YH |
1835 | if (!fn) |
1836 | goto out; | |
1837 | ||
d8d1f30b | 1838 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 1839 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
1840 | continue; |
1841 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1842 | continue; | |
1843 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1844 | continue; | |
d8d1f30b | 1845 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1846 | break; |
1847 | } | |
1848 | out: | |
5744dd9b | 1849 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1850 | return rt; |
1851 | } | |
1852 | ||
efa2cea0 | 1853 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
1854 | const struct in6_addr *prefix, int prefixlen, |
1855 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 1856 | unsigned int pref) |
70ceb4f5 | 1857 | { |
86872cb5 TG |
1858 | struct fib6_config cfg = { |
1859 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1860 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1861 | .fc_ifindex = ifindex, |
1862 | .fc_dst_len = prefixlen, | |
1863 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1864 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 1865 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
1866 | .fc_nlinfo.nlh = NULL, |
1867 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1868 | }; |
1869 | ||
4e3fd7a0 AD |
1870 | cfg.fc_dst = *prefix; |
1871 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 1872 | |
e317da96 YH |
1873 | /* We should treat it as a default route if prefix length is 0. */ |
1874 | if (!prefixlen) | |
86872cb5 | 1875 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1876 | |
86872cb5 | 1877 | ip6_route_add(&cfg); |
70ceb4f5 | 1878 | |
efa2cea0 | 1879 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1880 | } |
1881 | #endif | |
1882 | ||
b71d1d42 | 1883 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1884 | { |
1da177e4 | 1885 | struct rt6_info *rt; |
c71099ac | 1886 | struct fib6_table *table; |
1da177e4 | 1887 | |
c346dca1 | 1888 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 1889 | if (!table) |
c71099ac | 1890 | return NULL; |
1da177e4 | 1891 | |
5744dd9b | 1892 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1893 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
d1918542 | 1894 | if (dev == rt->dst.dev && |
045927ff | 1895 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1896 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1897 | break; | |
1898 | } | |
1899 | if (rt) | |
d8d1f30b | 1900 | dst_hold(&rt->dst); |
5744dd9b | 1901 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1902 | return rt; |
1903 | } | |
1904 | ||
b71d1d42 | 1905 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
1906 | struct net_device *dev, |
1907 | unsigned int pref) | |
1da177e4 | 1908 | { |
86872cb5 TG |
1909 | struct fib6_config cfg = { |
1910 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1911 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1912 | .fc_ifindex = dev->ifindex, |
1913 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1914 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 1915 | .fc_nlinfo.portid = 0, |
5578689a | 1916 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 1917 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1918 | }; |
1da177e4 | 1919 | |
4e3fd7a0 | 1920 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 1921 | |
86872cb5 | 1922 | ip6_route_add(&cfg); |
1da177e4 | 1923 | |
1da177e4 LT |
1924 | return rt6_get_dflt_router(gwaddr, dev); |
1925 | } | |
1926 | ||
7b4da532 | 1927 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1928 | { |
1929 | struct rt6_info *rt; | |
c71099ac TG |
1930 | struct fib6_table *table; |
1931 | ||
1932 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1933 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 1934 | if (!table) |
c71099ac | 1935 | return; |
1da177e4 LT |
1936 | |
1937 | restart: | |
c71099ac | 1938 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1939 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
3e8b0ac3 LC |
1940 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
1941 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d8d1f30b | 1942 | dst_hold(&rt->dst); |
c71099ac | 1943 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1944 | ip6_del_rt(rt); |
1da177e4 LT |
1945 | goto restart; |
1946 | } | |
1947 | } | |
c71099ac | 1948 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1949 | } |
1950 | ||
5578689a DL |
1951 | static void rtmsg_to_fib6_config(struct net *net, |
1952 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1953 | struct fib6_config *cfg) |
1954 | { | |
1955 | memset(cfg, 0, sizeof(*cfg)); | |
1956 | ||
1957 | cfg->fc_table = RT6_TABLE_MAIN; | |
1958 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1959 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1960 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1961 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1962 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1963 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1964 | ||
5578689a | 1965 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1966 | |
4e3fd7a0 AD |
1967 | cfg->fc_dst = rtmsg->rtmsg_dst; |
1968 | cfg->fc_src = rtmsg->rtmsg_src; | |
1969 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
1970 | } |
1971 | ||
5578689a | 1972 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1973 | { |
86872cb5 | 1974 | struct fib6_config cfg; |
1da177e4 LT |
1975 | struct in6_rtmsg rtmsg; |
1976 | int err; | |
1977 | ||
1978 | switch(cmd) { | |
1979 | case SIOCADDRT: /* Add a route */ | |
1980 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 1981 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1982 | return -EPERM; |
1983 | err = copy_from_user(&rtmsg, arg, | |
1984 | sizeof(struct in6_rtmsg)); | |
1985 | if (err) | |
1986 | return -EFAULT; | |
86872cb5 | 1987 | |
5578689a | 1988 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1989 | |
1da177e4 LT |
1990 | rtnl_lock(); |
1991 | switch (cmd) { | |
1992 | case SIOCADDRT: | |
86872cb5 | 1993 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1994 | break; |
1995 | case SIOCDELRT: | |
86872cb5 | 1996 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1997 | break; |
1998 | default: | |
1999 | err = -EINVAL; | |
2000 | } | |
2001 | rtnl_unlock(); | |
2002 | ||
2003 | return err; | |
3ff50b79 | 2004 | } |
1da177e4 LT |
2005 | |
2006 | return -EINVAL; | |
2007 | } | |
2008 | ||
2009 | /* | |
2010 | * Drop the packet on the floor | |
2011 | */ | |
2012 | ||
d5fdd6ba | 2013 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2014 | { |
612f09e8 | 2015 | int type; |
adf30907 | 2016 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2017 | switch (ipstats_mib_noroutes) { |
2018 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2019 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2020 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2021 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2022 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2023 | break; |
2024 | } | |
2025 | /* FALLTHROUGH */ | |
2026 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2027 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2028 | ipstats_mib_noroutes); | |
612f09e8 YH |
2029 | break; |
2030 | } | |
3ffe533c | 2031 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2032 | kfree_skb(skb); |
2033 | return 0; | |
2034 | } | |
2035 | ||
9ce8ade0 TG |
2036 | static int ip6_pkt_discard(struct sk_buff *skb) |
2037 | { | |
612f09e8 | 2038 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2039 | } |
2040 | ||
20380731 | 2041 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 2042 | { |
adf30907 | 2043 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2044 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2045 | } |
2046 | ||
6723ab54 DM |
2047 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2048 | ||
9ce8ade0 TG |
2049 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2050 | { | |
612f09e8 | 2051 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2052 | } |
2053 | ||
2054 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
2055 | { | |
adf30907 | 2056 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2057 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2058 | } |
2059 | ||
6723ab54 DM |
2060 | #endif |
2061 | ||
1da177e4 LT |
2062 | /* |
2063 | * Allocate a dst for local (unicast / anycast) address. | |
2064 | */ | |
2065 | ||
2066 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2067 | const struct in6_addr *addr, | |
8f031519 | 2068 | bool anycast) |
1da177e4 | 2069 | { |
c346dca1 | 2070 | struct net *net = dev_net(idev->dev); |
8b96d22d | 2071 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL); |
1da177e4 | 2072 | |
38308473 | 2073 | if (!rt) { |
f3213831 | 2074 | net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n"); |
1da177e4 | 2075 | return ERR_PTR(-ENOMEM); |
40385653 | 2076 | } |
1da177e4 | 2077 | |
1da177e4 LT |
2078 | in6_dev_hold(idev); |
2079 | ||
11d53b49 | 2080 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2081 | rt->dst.input = ip6_input; |
2082 | rt->dst.output = ip6_output; | |
1da177e4 | 2083 | rt->rt6i_idev = idev; |
1da177e4 LT |
2084 | |
2085 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2086 | if (anycast) |
2087 | rt->rt6i_flags |= RTF_ANYCAST; | |
2088 | else | |
1da177e4 | 2089 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2090 | |
4e3fd7a0 | 2091 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2092 | rt->rt6i_dst.plen = 128; |
5578689a | 2093 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2094 | |
d8d1f30b | 2095 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2096 | |
2097 | return rt; | |
2098 | } | |
2099 | ||
c3968a85 DW |
2100 | int ip6_route_get_saddr(struct net *net, |
2101 | struct rt6_info *rt, | |
b71d1d42 | 2102 | const struct in6_addr *daddr, |
c3968a85 DW |
2103 | unsigned int prefs, |
2104 | struct in6_addr *saddr) | |
2105 | { | |
2106 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2107 | int err = 0; | |
2108 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2109 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2110 | else |
2111 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2112 | daddr, prefs, saddr); | |
2113 | return err; | |
2114 | } | |
2115 | ||
2116 | /* remove deleted ip from prefsrc entries */ | |
2117 | struct arg_dev_net_ip { | |
2118 | struct net_device *dev; | |
2119 | struct net *net; | |
2120 | struct in6_addr *addr; | |
2121 | }; | |
2122 | ||
2123 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2124 | { | |
2125 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2126 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2127 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2128 | ||
d1918542 | 2129 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2130 | rt != net->ipv6.ip6_null_entry && |
2131 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2132 | /* remove prefsrc entry */ | |
2133 | rt->rt6i_prefsrc.plen = 0; | |
2134 | } | |
2135 | return 0; | |
2136 | } | |
2137 | ||
2138 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2139 | { | |
2140 | struct net *net = dev_net(ifp->idev->dev); | |
2141 | struct arg_dev_net_ip adni = { | |
2142 | .dev = ifp->idev->dev, | |
2143 | .net = net, | |
2144 | .addr = &ifp->addr, | |
2145 | }; | |
2146 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); | |
2147 | } | |
2148 | ||
8ed67789 DL |
2149 | struct arg_dev_net { |
2150 | struct net_device *dev; | |
2151 | struct net *net; | |
2152 | }; | |
2153 | ||
1da177e4 LT |
2154 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2155 | { | |
bc3ef660 | 2156 | const struct arg_dev_net *adn = arg; |
2157 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2158 | |
d1918542 | 2159 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2160 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2161 | return -1; |
c159d30c | 2162 | |
1da177e4 LT |
2163 | return 0; |
2164 | } | |
2165 | ||
f3db4851 | 2166 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2167 | { |
8ed67789 DL |
2168 | struct arg_dev_net adn = { |
2169 | .dev = dev, | |
2170 | .net = net, | |
2171 | }; | |
2172 | ||
2173 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2174 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2175 | } |
2176 | ||
95c96174 | 2177 | struct rt6_mtu_change_arg { |
1da177e4 | 2178 | struct net_device *dev; |
95c96174 | 2179 | unsigned int mtu; |
1da177e4 LT |
2180 | }; |
2181 | ||
2182 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2183 | { | |
2184 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2185 | struct inet6_dev *idev; | |
2186 | ||
2187 | /* In IPv6 pmtu discovery is not optional, | |
2188 | so that RTAX_MTU lock cannot disable it. | |
2189 | We still use this lock to block changes | |
2190 | caused by addrconf/ndisc. | |
2191 | */ | |
2192 | ||
2193 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2194 | if (!idev) |
1da177e4 LT |
2195 | return 0; |
2196 | ||
2197 | /* For administrative MTU increase, there is no way to discover | |
2198 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2199 | Since RFC 1981 doesn't include administrative MTU increase | |
2200 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2201 | */ | |
2202 | /* | |
2203 | If new MTU is less than route PMTU, this new MTU will be the | |
2204 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2205 | decreases; if new MTU is greater than route PMTU, and the | |
2206 | old MTU is the lowest MTU in the path, update the route PMTU | |
2207 | to reflect the increase. In this case if the other nodes' MTU | |
2208 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2209 | PMTU discouvery. | |
2210 | */ | |
d1918542 | 2211 | if (rt->dst.dev == arg->dev && |
d8d1f30b CG |
2212 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2213 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2214 | (dst_mtu(&rt->dst) < arg->mtu && | |
2215 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2216 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2217 | } |
1da177e4 LT |
2218 | return 0; |
2219 | } | |
2220 | ||
95c96174 | 2221 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2222 | { |
c71099ac TG |
2223 | struct rt6_mtu_change_arg arg = { |
2224 | .dev = dev, | |
2225 | .mtu = mtu, | |
2226 | }; | |
1da177e4 | 2227 | |
c346dca1 | 2228 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2229 | } |
2230 | ||
ef7c79ed | 2231 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2232 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2233 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2234 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2235 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2236 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2237 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
86872cb5 TG |
2238 | }; |
2239 | ||
2240 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2241 | struct fib6_config *cfg) | |
1da177e4 | 2242 | { |
86872cb5 TG |
2243 | struct rtmsg *rtm; |
2244 | struct nlattr *tb[RTA_MAX+1]; | |
2245 | int err; | |
1da177e4 | 2246 | |
86872cb5 TG |
2247 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2248 | if (err < 0) | |
2249 | goto errout; | |
1da177e4 | 2250 | |
86872cb5 TG |
2251 | err = -EINVAL; |
2252 | rtm = nlmsg_data(nlh); | |
2253 | memset(cfg, 0, sizeof(*cfg)); | |
2254 | ||
2255 | cfg->fc_table = rtm->rtm_table; | |
2256 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2257 | cfg->fc_src_len = rtm->rtm_src_len; | |
2258 | cfg->fc_flags = RTF_UP; | |
2259 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2260 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2261 | |
ef2c7d7b ND |
2262 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2263 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2264 | rtm->rtm_type == RTN_PROHIBIT || |
2265 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2266 | cfg->fc_flags |= RTF_REJECT; |
2267 | ||
ab79ad14 MŻ |
2268 | if (rtm->rtm_type == RTN_LOCAL) |
2269 | cfg->fc_flags |= RTF_LOCAL; | |
2270 | ||
15e47304 | 2271 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2272 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2273 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2274 | |
2275 | if (tb[RTA_GATEWAY]) { | |
2276 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2277 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2278 | } |
86872cb5 TG |
2279 | |
2280 | if (tb[RTA_DST]) { | |
2281 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2282 | ||
2283 | if (nla_len(tb[RTA_DST]) < plen) | |
2284 | goto errout; | |
2285 | ||
2286 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2287 | } |
86872cb5 TG |
2288 | |
2289 | if (tb[RTA_SRC]) { | |
2290 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2291 | ||
2292 | if (nla_len(tb[RTA_SRC]) < plen) | |
2293 | goto errout; | |
2294 | ||
2295 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2296 | } |
86872cb5 | 2297 | |
c3968a85 DW |
2298 | if (tb[RTA_PREFSRC]) |
2299 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2300 | ||
86872cb5 TG |
2301 | if (tb[RTA_OIF]) |
2302 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2303 | ||
2304 | if (tb[RTA_PRIORITY]) | |
2305 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2306 | ||
2307 | if (tb[RTA_METRICS]) { | |
2308 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2309 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2310 | } |
86872cb5 TG |
2311 | |
2312 | if (tb[RTA_TABLE]) | |
2313 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2314 | ||
51ebd318 ND |
2315 | if (tb[RTA_MULTIPATH]) { |
2316 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2317 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
2318 | } | |
2319 | ||
86872cb5 TG |
2320 | err = 0; |
2321 | errout: | |
2322 | return err; | |
1da177e4 LT |
2323 | } |
2324 | ||
51ebd318 ND |
2325 | static int ip6_route_multipath(struct fib6_config *cfg, int add) |
2326 | { | |
2327 | struct fib6_config r_cfg; | |
2328 | struct rtnexthop *rtnh; | |
2329 | int remaining; | |
2330 | int attrlen; | |
2331 | int err = 0, last_err = 0; | |
2332 | ||
2333 | beginning: | |
2334 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
2335 | remaining = cfg->fc_mp_len; | |
2336 | ||
2337 | /* Parse a Multipath Entry */ | |
2338 | while (rtnh_ok(rtnh, remaining)) { | |
2339 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2340 | if (rtnh->rtnh_ifindex) | |
2341 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2342 | ||
2343 | attrlen = rtnh_attrlen(rtnh); | |
2344 | if (attrlen > 0) { | |
2345 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2346 | ||
2347 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2348 | if (nla) { | |
2349 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
2350 | r_cfg.fc_flags |= RTF_GATEWAY; | |
2351 | } | |
2352 | } | |
2353 | err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg); | |
2354 | if (err) { | |
2355 | last_err = err; | |
2356 | /* If we are trying to remove a route, do not stop the | |
2357 | * loop when ip6_route_del() fails (because next hop is | |
2358 | * already gone), we should try to remove all next hops. | |
2359 | */ | |
2360 | if (add) { | |
2361 | /* If add fails, we should try to delete all | |
2362 | * next hops that have been already added. | |
2363 | */ | |
2364 | add = 0; | |
2365 | goto beginning; | |
2366 | } | |
2367 | } | |
1a72418b ND |
2368 | /* Because each route is added like a single route we remove |
2369 | * this flag after the first nexthop (if there is a collision, | |
2370 | * we have already fail to add the first nexthop: | |
2371 | * fib6_add_rt2node() has reject it). | |
2372 | */ | |
2373 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL; | |
51ebd318 ND |
2374 | rtnh = rtnh_next(rtnh, &remaining); |
2375 | } | |
2376 | ||
2377 | return last_err; | |
2378 | } | |
2379 | ||
661d2967 | 2380 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh) |
1da177e4 | 2381 | { |
86872cb5 TG |
2382 | struct fib6_config cfg; |
2383 | int err; | |
1da177e4 | 2384 | |
86872cb5 TG |
2385 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2386 | if (err < 0) | |
2387 | return err; | |
2388 | ||
51ebd318 ND |
2389 | if (cfg.fc_mp) |
2390 | return ip6_route_multipath(&cfg, 0); | |
2391 | else | |
2392 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2393 | } |
2394 | ||
661d2967 | 2395 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh) |
1da177e4 | 2396 | { |
86872cb5 TG |
2397 | struct fib6_config cfg; |
2398 | int err; | |
1da177e4 | 2399 | |
86872cb5 TG |
2400 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2401 | if (err < 0) | |
2402 | return err; | |
2403 | ||
51ebd318 ND |
2404 | if (cfg.fc_mp) |
2405 | return ip6_route_multipath(&cfg, 1); | |
2406 | else | |
2407 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2408 | } |
2409 | ||
339bf98f TG |
2410 | static inline size_t rt6_nlmsg_size(void) |
2411 | { | |
2412 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2413 | + nla_total_size(16) /* RTA_SRC */ | |
2414 | + nla_total_size(16) /* RTA_DST */ | |
2415 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2416 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2417 | + nla_total_size(4) /* RTA_TABLE */ | |
2418 | + nla_total_size(4) /* RTA_IIF */ | |
2419 | + nla_total_size(4) /* RTA_OIF */ | |
2420 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2421 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2422 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2423 | } | |
2424 | ||
191cd582 BH |
2425 | static int rt6_fill_node(struct net *net, |
2426 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 2427 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 2428 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 2429 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2430 | { |
2431 | struct rtmsg *rtm; | |
2d7202bf | 2432 | struct nlmsghdr *nlh; |
e3703b3d | 2433 | long expires; |
9e762a4a | 2434 | u32 table; |
1da177e4 LT |
2435 | |
2436 | if (prefix) { /* user wants prefix routes only */ | |
2437 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2438 | /* success since this is not a prefix route */ | |
2439 | return 1; | |
2440 | } | |
2441 | } | |
2442 | ||
15e47304 | 2443 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 2444 | if (!nlh) |
26932566 | 2445 | return -EMSGSIZE; |
2d7202bf TG |
2446 | |
2447 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2448 | rtm->rtm_family = AF_INET6; |
2449 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2450 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2451 | rtm->rtm_tos = 0; | |
c71099ac | 2452 | if (rt->rt6i_table) |
9e762a4a | 2453 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2454 | else |
9e762a4a PM |
2455 | table = RT6_TABLE_UNSPEC; |
2456 | rtm->rtm_table = table; | |
c78679e8 DM |
2457 | if (nla_put_u32(skb, RTA_TABLE, table)) |
2458 | goto nla_put_failure; | |
ef2c7d7b ND |
2459 | if (rt->rt6i_flags & RTF_REJECT) { |
2460 | switch (rt->dst.error) { | |
2461 | case -EINVAL: | |
2462 | rtm->rtm_type = RTN_BLACKHOLE; | |
2463 | break; | |
2464 | case -EACCES: | |
2465 | rtm->rtm_type = RTN_PROHIBIT; | |
2466 | break; | |
b4949ab2 ND |
2467 | case -EAGAIN: |
2468 | rtm->rtm_type = RTN_THROW; | |
2469 | break; | |
ef2c7d7b ND |
2470 | default: |
2471 | rtm->rtm_type = RTN_UNREACHABLE; | |
2472 | break; | |
2473 | } | |
2474 | } | |
38308473 | 2475 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2476 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2477 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2478 | rtm->rtm_type = RTN_LOCAL; |
2479 | else | |
2480 | rtm->rtm_type = RTN_UNICAST; | |
2481 | rtm->rtm_flags = 0; | |
2482 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2483 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2484 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 2485 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
2486 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
2487 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
2488 | rtm->rtm_protocol = RTPROT_RA; | |
2489 | else | |
2490 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2491 | } | |
1da177e4 | 2492 | |
38308473 | 2493 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2494 | rtm->rtm_flags |= RTM_F_CLONED; |
2495 | ||
2496 | if (dst) { | |
c78679e8 DM |
2497 | if (nla_put(skb, RTA_DST, 16, dst)) |
2498 | goto nla_put_failure; | |
1ab1457c | 2499 | rtm->rtm_dst_len = 128; |
1da177e4 | 2500 | } else if (rtm->rtm_dst_len) |
c78679e8 DM |
2501 | if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) |
2502 | goto nla_put_failure; | |
1da177e4 LT |
2503 | #ifdef CONFIG_IPV6_SUBTREES |
2504 | if (src) { | |
c78679e8 DM |
2505 | if (nla_put(skb, RTA_SRC, 16, src)) |
2506 | goto nla_put_failure; | |
1ab1457c | 2507 | rtm->rtm_src_len = 128; |
c78679e8 DM |
2508 | } else if (rtm->rtm_src_len && |
2509 | nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) | |
2510 | goto nla_put_failure; | |
1da177e4 | 2511 | #endif |
7bc570c8 YH |
2512 | if (iif) { |
2513 | #ifdef CONFIG_IPV6_MROUTE | |
2514 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2515 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2516 | if (err <= 0) { |
2517 | if (!nowait) { | |
2518 | if (err == 0) | |
2519 | return 0; | |
2520 | goto nla_put_failure; | |
2521 | } else { | |
2522 | if (err == -EMSGSIZE) | |
2523 | goto nla_put_failure; | |
2524 | } | |
2525 | } | |
2526 | } else | |
2527 | #endif | |
c78679e8 DM |
2528 | if (nla_put_u32(skb, RTA_IIF, iif)) |
2529 | goto nla_put_failure; | |
7bc570c8 | 2530 | } else if (dst) { |
1da177e4 | 2531 | struct in6_addr saddr_buf; |
c78679e8 DM |
2532 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
2533 | nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) | |
2534 | goto nla_put_failure; | |
1da177e4 | 2535 | } |
2d7202bf | 2536 | |
c3968a85 DW |
2537 | if (rt->rt6i_prefsrc.plen) { |
2538 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2539 | saddr_buf = rt->rt6i_prefsrc.addr; |
c78679e8 DM |
2540 | if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
2541 | goto nla_put_failure; | |
c3968a85 DW |
2542 | } |
2543 | ||
defb3519 | 2544 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2545 | goto nla_put_failure; |
2546 | ||
dd0cbf29 YH |
2547 | if (rt->rt6i_flags & RTF_GATEWAY) { |
2548 | if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0) | |
94f826b8 | 2549 | goto nla_put_failure; |
94f826b8 | 2550 | } |
2d7202bf | 2551 | |
c78679e8 DM |
2552 | if (rt->dst.dev && |
2553 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2554 | goto nla_put_failure; | |
2555 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
2556 | goto nla_put_failure; | |
8253947e LW |
2557 | |
2558 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 2559 | |
87a50699 | 2560 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 2561 | goto nla_put_failure; |
2d7202bf TG |
2562 | |
2563 | return nlmsg_end(skb, nlh); | |
2564 | ||
2565 | nla_put_failure: | |
26932566 PM |
2566 | nlmsg_cancel(skb, nlh); |
2567 | return -EMSGSIZE; | |
1da177e4 LT |
2568 | } |
2569 | ||
1b43af54 | 2570 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2571 | { |
2572 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2573 | int prefix; | |
2574 | ||
2d7202bf TG |
2575 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2576 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2577 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2578 | } else | |
2579 | prefix = 0; | |
2580 | ||
191cd582 BH |
2581 | return rt6_fill_node(arg->net, |
2582 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 2583 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2584 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2585 | } |
2586 | ||
661d2967 | 2587 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh) |
1da177e4 | 2588 | { |
3b1e0a65 | 2589 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2590 | struct nlattr *tb[RTA_MAX+1]; |
2591 | struct rt6_info *rt; | |
1da177e4 | 2592 | struct sk_buff *skb; |
ab364a6f | 2593 | struct rtmsg *rtm; |
4c9483b2 | 2594 | struct flowi6 fl6; |
72331bc0 | 2595 | int err, iif = 0, oif = 0; |
1da177e4 | 2596 | |
ab364a6f TG |
2597 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2598 | if (err < 0) | |
2599 | goto errout; | |
1da177e4 | 2600 | |
ab364a6f | 2601 | err = -EINVAL; |
4c9483b2 | 2602 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2603 | |
ab364a6f TG |
2604 | if (tb[RTA_SRC]) { |
2605 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2606 | goto errout; | |
2607 | ||
4e3fd7a0 | 2608 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2609 | } |
2610 | ||
2611 | if (tb[RTA_DST]) { | |
2612 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2613 | goto errout; | |
2614 | ||
4e3fd7a0 | 2615 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2616 | } |
2617 | ||
2618 | if (tb[RTA_IIF]) | |
2619 | iif = nla_get_u32(tb[RTA_IIF]); | |
2620 | ||
2621 | if (tb[RTA_OIF]) | |
72331bc0 | 2622 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 LT |
2623 | |
2624 | if (iif) { | |
2625 | struct net_device *dev; | |
72331bc0 SL |
2626 | int flags = 0; |
2627 | ||
5578689a | 2628 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2629 | if (!dev) { |
2630 | err = -ENODEV; | |
ab364a6f | 2631 | goto errout; |
1da177e4 | 2632 | } |
72331bc0 SL |
2633 | |
2634 | fl6.flowi6_iif = iif; | |
2635 | ||
2636 | if (!ipv6_addr_any(&fl6.saddr)) | |
2637 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2638 | ||
2639 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
2640 | flags); | |
2641 | } else { | |
2642 | fl6.flowi6_oif = oif; | |
2643 | ||
2644 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
2645 | } |
2646 | ||
ab364a6f | 2647 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2648 | if (!skb) { |
94e187c0 | 2649 | ip6_rt_put(rt); |
ab364a6f TG |
2650 | err = -ENOBUFS; |
2651 | goto errout; | |
2652 | } | |
1da177e4 | 2653 | |
ab364a6f TG |
2654 | /* Reserve room for dummy headers, this skb can pass |
2655 | through good chunk of routing engine. | |
2656 | */ | |
459a98ed | 2657 | skb_reset_mac_header(skb); |
ab364a6f | 2658 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2659 | |
d8d1f30b | 2660 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2661 | |
4c9483b2 | 2662 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 2663 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 2664 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2665 | if (err < 0) { |
ab364a6f TG |
2666 | kfree_skb(skb); |
2667 | goto errout; | |
1da177e4 LT |
2668 | } |
2669 | ||
15e47304 | 2670 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 2671 | errout: |
1da177e4 | 2672 | return err; |
1da177e4 LT |
2673 | } |
2674 | ||
86872cb5 | 2675 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2676 | { |
2677 | struct sk_buff *skb; | |
5578689a | 2678 | struct net *net = info->nl_net; |
528c4ceb DL |
2679 | u32 seq; |
2680 | int err; | |
2681 | ||
2682 | err = -ENOBUFS; | |
38308473 | 2683 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2684 | |
339bf98f | 2685 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2686 | if (!skb) |
21713ebc TG |
2687 | goto errout; |
2688 | ||
191cd582 | 2689 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
15e47304 | 2690 | event, info->portid, seq, 0, 0, 0); |
26932566 PM |
2691 | if (err < 0) { |
2692 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2693 | WARN_ON(err == -EMSGSIZE); | |
2694 | kfree_skb(skb); | |
2695 | goto errout; | |
2696 | } | |
15e47304 | 2697 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
2698 | info->nlh, gfp_any()); |
2699 | return; | |
21713ebc TG |
2700 | errout: |
2701 | if (err < 0) | |
5578689a | 2702 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2703 | } |
2704 | ||
8ed67789 DL |
2705 | static int ip6_route_dev_notify(struct notifier_block *this, |
2706 | unsigned long event, void *data) | |
2707 | { | |
2708 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2709 | struct net *net = dev_net(dev); |
8ed67789 DL |
2710 | |
2711 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2712 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2713 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2714 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2715 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2716 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2717 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2718 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2719 | #endif | |
2720 | } | |
2721 | ||
2722 | return NOTIFY_OK; | |
2723 | } | |
2724 | ||
1da177e4 LT |
2725 | /* |
2726 | * /proc | |
2727 | */ | |
2728 | ||
2729 | #ifdef CONFIG_PROC_FS | |
2730 | ||
1da177e4 LT |
2731 | struct rt6_proc_arg |
2732 | { | |
2733 | char *buffer; | |
2734 | int offset; | |
2735 | int length; | |
2736 | int skip; | |
2737 | int len; | |
2738 | }; | |
2739 | ||
2740 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2741 | { | |
33120b30 | 2742 | struct seq_file *m = p_arg; |
1da177e4 | 2743 | |
4b7a4274 | 2744 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2745 | |
2746 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2747 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2748 | #else |
33120b30 | 2749 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 | 2750 | #endif |
dd0cbf29 YH |
2751 | if (rt->rt6i_flags & RTF_GATEWAY) { |
2752 | seq_printf(m, "%pi6", &rt->rt6i_gateway); | |
1da177e4 | 2753 | } else { |
33120b30 | 2754 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2755 | } |
33120b30 | 2756 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2757 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2758 | rt->dst.__use, rt->rt6i_flags, | |
d1918542 | 2759 | rt->dst.dev ? rt->dst.dev->name : ""); |
1da177e4 LT |
2760 | return 0; |
2761 | } | |
2762 | ||
33120b30 | 2763 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2764 | { |
f3db4851 | 2765 | struct net *net = (struct net *)m->private; |
32b293a5 | 2766 | fib6_clean_all_ro(net, rt6_info_route, 0, m); |
33120b30 AD |
2767 | return 0; |
2768 | } | |
1da177e4 | 2769 | |
33120b30 AD |
2770 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2771 | { | |
de05c557 | 2772 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2773 | } |
2774 | ||
33120b30 AD |
2775 | static const struct file_operations ipv6_route_proc_fops = { |
2776 | .owner = THIS_MODULE, | |
2777 | .open = ipv6_route_open, | |
2778 | .read = seq_read, | |
2779 | .llseek = seq_lseek, | |
b6fcbdb4 | 2780 | .release = single_release_net, |
33120b30 AD |
2781 | }; |
2782 | ||
1da177e4 LT |
2783 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2784 | { | |
69ddb805 | 2785 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2786 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2787 | net->ipv6.rt6_stats->fib_nodes, |
2788 | net->ipv6.rt6_stats->fib_route_nodes, | |
2789 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2790 | net->ipv6.rt6_stats->fib_rt_entries, | |
2791 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2792 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2793 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2794 | |
2795 | return 0; | |
2796 | } | |
2797 | ||
2798 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2799 | { | |
de05c557 | 2800 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2801 | } |
2802 | ||
9a32144e | 2803 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2804 | .owner = THIS_MODULE, |
2805 | .open = rt6_stats_seq_open, | |
2806 | .read = seq_read, | |
2807 | .llseek = seq_lseek, | |
b6fcbdb4 | 2808 | .release = single_release_net, |
1da177e4 LT |
2809 | }; |
2810 | #endif /* CONFIG_PROC_FS */ | |
2811 | ||
2812 | #ifdef CONFIG_SYSCTL | |
2813 | ||
1da177e4 | 2814 | static |
8d65af78 | 2815 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2816 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2817 | { | |
c486da34 LAG |
2818 | struct net *net; |
2819 | int delay; | |
2820 | if (!write) | |
1da177e4 | 2821 | return -EINVAL; |
c486da34 LAG |
2822 | |
2823 | net = (struct net *)ctl->extra1; | |
2824 | delay = net->ipv6.sysctl.flush_delay; | |
2825 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2826 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); | |
2827 | return 0; | |
1da177e4 LT |
2828 | } |
2829 | ||
760f2d01 | 2830 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2831 | { |
1da177e4 | 2832 | .procname = "flush", |
4990509f | 2833 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2834 | .maxlen = sizeof(int), |
89c8b3a1 | 2835 | .mode = 0200, |
6d9f239a | 2836 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2837 | }, |
2838 | { | |
1da177e4 | 2839 | .procname = "gc_thresh", |
9a7ec3a9 | 2840 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2841 | .maxlen = sizeof(int), |
2842 | .mode = 0644, | |
6d9f239a | 2843 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2844 | }, |
2845 | { | |
1da177e4 | 2846 | .procname = "max_size", |
4990509f | 2847 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2848 | .maxlen = sizeof(int), |
2849 | .mode = 0644, | |
6d9f239a | 2850 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2851 | }, |
2852 | { | |
1da177e4 | 2853 | .procname = "gc_min_interval", |
4990509f | 2854 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2855 | .maxlen = sizeof(int), |
2856 | .mode = 0644, | |
6d9f239a | 2857 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2858 | }, |
2859 | { | |
1da177e4 | 2860 | .procname = "gc_timeout", |
4990509f | 2861 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2862 | .maxlen = sizeof(int), |
2863 | .mode = 0644, | |
6d9f239a | 2864 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2865 | }, |
2866 | { | |
1da177e4 | 2867 | .procname = "gc_interval", |
4990509f | 2868 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2869 | .maxlen = sizeof(int), |
2870 | .mode = 0644, | |
6d9f239a | 2871 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2872 | }, |
2873 | { | |
1da177e4 | 2874 | .procname = "gc_elasticity", |
4990509f | 2875 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2876 | .maxlen = sizeof(int), |
2877 | .mode = 0644, | |
f3d3f616 | 2878 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2879 | }, |
2880 | { | |
1da177e4 | 2881 | .procname = "mtu_expires", |
4990509f | 2882 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2883 | .maxlen = sizeof(int), |
2884 | .mode = 0644, | |
6d9f239a | 2885 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2886 | }, |
2887 | { | |
1da177e4 | 2888 | .procname = "min_adv_mss", |
4990509f | 2889 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2890 | .maxlen = sizeof(int), |
2891 | .mode = 0644, | |
f3d3f616 | 2892 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2893 | }, |
2894 | { | |
1da177e4 | 2895 | .procname = "gc_min_interval_ms", |
4990509f | 2896 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2897 | .maxlen = sizeof(int), |
2898 | .mode = 0644, | |
6d9f239a | 2899 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2900 | }, |
f8572d8f | 2901 | { } |
1da177e4 LT |
2902 | }; |
2903 | ||
2c8c1e72 | 2904 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2905 | { |
2906 | struct ctl_table *table; | |
2907 | ||
2908 | table = kmemdup(ipv6_route_table_template, | |
2909 | sizeof(ipv6_route_table_template), | |
2910 | GFP_KERNEL); | |
5ee09105 YH |
2911 | |
2912 | if (table) { | |
2913 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2914 | table[0].extra1 = net; |
86393e52 | 2915 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2916 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2917 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2918 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2919 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2920 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2921 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2922 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2923 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
2924 | |
2925 | /* Don't export sysctls to unprivileged users */ | |
2926 | if (net->user_ns != &init_user_ns) | |
2927 | table[0].procname = NULL; | |
5ee09105 YH |
2928 | } |
2929 | ||
760f2d01 DL |
2930 | return table; |
2931 | } | |
1da177e4 LT |
2932 | #endif |
2933 | ||
2c8c1e72 | 2934 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2935 | { |
633d424b | 2936 | int ret = -ENOMEM; |
8ed67789 | 2937 | |
86393e52 AD |
2938 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2939 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2940 | |
fc66f95c ED |
2941 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2942 | goto out_ip6_dst_ops; | |
2943 | ||
8ed67789 DL |
2944 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2945 | sizeof(*net->ipv6.ip6_null_entry), | |
2946 | GFP_KERNEL); | |
2947 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2948 | goto out_ip6_dst_entries; |
d8d1f30b | 2949 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2950 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2951 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2952 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
2953 | ip6_template_metrics, true); | |
8ed67789 DL |
2954 | |
2955 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2956 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2957 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2958 | GFP_KERNEL); | |
68fffc67 PZ |
2959 | if (!net->ipv6.ip6_prohibit_entry) |
2960 | goto out_ip6_null_entry; | |
d8d1f30b | 2961 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2962 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2963 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2964 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
2965 | ip6_template_metrics, true); | |
8ed67789 DL |
2966 | |
2967 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2968 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2969 | GFP_KERNEL); | |
68fffc67 PZ |
2970 | if (!net->ipv6.ip6_blk_hole_entry) |
2971 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2972 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2973 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2974 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2975 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
2976 | ip6_template_metrics, true); | |
8ed67789 DL |
2977 | #endif |
2978 | ||
b339a47c PZ |
2979 | net->ipv6.sysctl.flush_delay = 0; |
2980 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2981 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2982 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2983 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2984 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2985 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2986 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2987 | ||
6891a346 BT |
2988 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2989 | ||
8ed67789 DL |
2990 | ret = 0; |
2991 | out: | |
2992 | return ret; | |
f2fc6a54 | 2993 | |
68fffc67 PZ |
2994 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2995 | out_ip6_prohibit_entry: | |
2996 | kfree(net->ipv6.ip6_prohibit_entry); | |
2997 | out_ip6_null_entry: | |
2998 | kfree(net->ipv6.ip6_null_entry); | |
2999 | #endif | |
fc66f95c ED |
3000 | out_ip6_dst_entries: |
3001 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3002 | out_ip6_dst_ops: |
f2fc6a54 | 3003 | goto out; |
cdb18761 DL |
3004 | } |
3005 | ||
2c8c1e72 | 3006 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3007 | { |
8ed67789 DL |
3008 | kfree(net->ipv6.ip6_null_entry); |
3009 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3010 | kfree(net->ipv6.ip6_prohibit_entry); | |
3011 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3012 | #endif | |
41bb78b4 | 3013 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3014 | } |
3015 | ||
d189634e TG |
3016 | static int __net_init ip6_route_net_init_late(struct net *net) |
3017 | { | |
3018 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
3019 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
3020 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3021 | #endif |
3022 | return 0; | |
3023 | } | |
3024 | ||
3025 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3026 | { | |
3027 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3028 | remove_proc_entry("ipv6_route", net->proc_net); |
3029 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3030 | #endif |
3031 | } | |
3032 | ||
cdb18761 DL |
3033 | static struct pernet_operations ip6_route_net_ops = { |
3034 | .init = ip6_route_net_init, | |
3035 | .exit = ip6_route_net_exit, | |
3036 | }; | |
3037 | ||
c3426b47 DM |
3038 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3039 | { | |
3040 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3041 | ||
3042 | if (!bp) | |
3043 | return -ENOMEM; | |
3044 | inet_peer_base_init(bp); | |
3045 | net->ipv6.peers = bp; | |
3046 | return 0; | |
3047 | } | |
3048 | ||
3049 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3050 | { | |
3051 | struct inet_peer_base *bp = net->ipv6.peers; | |
3052 | ||
3053 | net->ipv6.peers = NULL; | |
56a6b248 | 3054 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3055 | kfree(bp); |
3056 | } | |
3057 | ||
2b823f72 | 3058 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3059 | .init = ipv6_inetpeer_init, |
3060 | .exit = ipv6_inetpeer_exit, | |
3061 | }; | |
3062 | ||
d189634e TG |
3063 | static struct pernet_operations ip6_route_net_late_ops = { |
3064 | .init = ip6_route_net_init_late, | |
3065 | .exit = ip6_route_net_exit_late, | |
3066 | }; | |
3067 | ||
8ed67789 DL |
3068 | static struct notifier_block ip6_route_dev_notifier = { |
3069 | .notifier_call = ip6_route_dev_notify, | |
3070 | .priority = 0, | |
3071 | }; | |
3072 | ||
433d49c3 | 3073 | int __init ip6_route_init(void) |
1da177e4 | 3074 | { |
433d49c3 DL |
3075 | int ret; |
3076 | ||
9a7ec3a9 DL |
3077 | ret = -ENOMEM; |
3078 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3079 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3080 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3081 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3082 | goto out; |
14e50e57 | 3083 | |
fc66f95c | 3084 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3085 | if (ret) |
bdb3289f | 3086 | goto out_kmem_cache; |
bdb3289f | 3087 | |
c3426b47 DM |
3088 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3089 | if (ret) | |
e8803b6c | 3090 | goto out_dst_entries; |
2a0c451a | 3091 | |
7e52b33b DM |
3092 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3093 | if (ret) | |
3094 | goto out_register_inetpeer; | |
c3426b47 | 3095 | |
5dc121e9 AE |
3096 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3097 | ||
8ed67789 DL |
3098 | /* Registering of the loopback is done before this portion of code, |
3099 | * the loopback reference in rt6_info will not be taken, do it | |
3100 | * manually for init_net */ | |
d8d1f30b | 3101 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3102 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3103 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3104 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3105 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3106 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3107 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3108 | #endif | |
e8803b6c | 3109 | ret = fib6_init(); |
433d49c3 | 3110 | if (ret) |
8ed67789 | 3111 | goto out_register_subsys; |
433d49c3 | 3112 | |
433d49c3 DL |
3113 | ret = xfrm6_init(); |
3114 | if (ret) | |
e8803b6c | 3115 | goto out_fib6_init; |
c35b7e72 | 3116 | |
433d49c3 DL |
3117 | ret = fib6_rules_init(); |
3118 | if (ret) | |
3119 | goto xfrm6_init; | |
7e5449c2 | 3120 | |
d189634e TG |
3121 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3122 | if (ret) | |
3123 | goto fib6_rules_init; | |
3124 | ||
433d49c3 | 3125 | ret = -ENOBUFS; |
c7ac8679 GR |
3126 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3127 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3128 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3129 | goto out_register_late_subsys; |
c127ea2c | 3130 | |
8ed67789 | 3131 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3132 | if (ret) |
d189634e | 3133 | goto out_register_late_subsys; |
8ed67789 | 3134 | |
433d49c3 DL |
3135 | out: |
3136 | return ret; | |
3137 | ||
d189634e TG |
3138 | out_register_late_subsys: |
3139 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3140 | fib6_rules_init: |
433d49c3 DL |
3141 | fib6_rules_cleanup(); |
3142 | xfrm6_init: | |
433d49c3 | 3143 | xfrm6_fini(); |
2a0c451a TG |
3144 | out_fib6_init: |
3145 | fib6_gc_cleanup(); | |
8ed67789 DL |
3146 | out_register_subsys: |
3147 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3148 | out_register_inetpeer: |
3149 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3150 | out_dst_entries: |
3151 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3152 | out_kmem_cache: |
f2fc6a54 | 3153 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3154 | goto out; |
1da177e4 LT |
3155 | } |
3156 | ||
3157 | void ip6_route_cleanup(void) | |
3158 | { | |
8ed67789 | 3159 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3160 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3161 | fib6_rules_cleanup(); |
1da177e4 | 3162 | xfrm6_fini(); |
1da177e4 | 3163 | fib6_gc_cleanup(); |
c3426b47 | 3164 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3165 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3166 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3167 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3168 | } |