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); | |
5af58eb0 K |
87 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
88 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
1da177e4 | 89 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
90 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
91 | struct sk_buff *skb, u32 mtu); | |
92 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
93 | struct sk_buff *skb); | |
1da177e4 | 94 | |
70ceb4f5 | 95 | #ifdef CONFIG_IPV6_ROUTE_INFO |
6fa3eb70 | 96 | static struct rt6_info *rt6_add_route_info(struct net_device *dev, |
b71d1d42 | 97 | const struct in6_addr *prefix, int prefixlen, |
6fa3eb70 S |
98 | const struct in6_addr *gwaddr, unsigned int pref); |
99 | static struct rt6_info *rt6_get_route_info(struct net_device *dev, | |
b71d1d42 | 100 | const struct in6_addr *prefix, int prefixlen, |
6fa3eb70 | 101 | const struct in6_addr *gwaddr); |
70ceb4f5 YH |
102 | #endif |
103 | ||
06582540 DM |
104 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
105 | { | |
106 | struct rt6_info *rt = (struct rt6_info *) dst; | |
107 | struct inet_peer *peer; | |
108 | u32 *p = NULL; | |
109 | ||
8e2ec639 | 110 | if (!(rt->dst.flags & DST_HOST)) |
e5fc2a02 | 111 | return dst_cow_metrics_generic(dst, old); |
8e2ec639 | 112 | |
fbfe95a4 | 113 | peer = rt6_get_peer_create(rt); |
06582540 DM |
114 | if (peer) { |
115 | u32 *old_p = __DST_METRICS_PTR(old); | |
116 | unsigned long prev, new; | |
117 | ||
118 | p = peer->metrics; | |
119 | if (inet_metrics_new(peer)) | |
120 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
121 | ||
122 | new = (unsigned long) p; | |
123 | prev = cmpxchg(&dst->_metrics, old, new); | |
124 | ||
125 | if (prev != old) { | |
126 | p = __DST_METRICS_PTR(prev); | |
127 | if (prev & DST_METRICS_READ_ONLY) | |
128 | p = NULL; | |
129 | } | |
130 | } | |
131 | return p; | |
132 | } | |
133 | ||
f894cbf8 DM |
134 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
135 | struct sk_buff *skb, | |
136 | const void *daddr) | |
39232973 DM |
137 | { |
138 | struct in6_addr *p = &rt->rt6i_gateway; | |
139 | ||
a7563f34 | 140 | if (!ipv6_addr_any(p)) |
39232973 | 141 | return (const void *) p; |
f894cbf8 DM |
142 | else if (skb) |
143 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
144 | return daddr; |
145 | } | |
146 | ||
f894cbf8 DM |
147 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
148 | struct sk_buff *skb, | |
149 | const void *daddr) | |
d3aaeb38 | 150 | { |
39232973 DM |
151 | struct rt6_info *rt = (struct rt6_info *) dst; |
152 | struct neighbour *n; | |
153 | ||
f894cbf8 | 154 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 155 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
156 | if (n) |
157 | return n; | |
158 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
159 | } | |
160 | ||
9a7ec3a9 | 161 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 162 | .family = AF_INET6, |
09640e63 | 163 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
164 | .gc = ip6_dst_gc, |
165 | .gc_thresh = 1024, | |
166 | .check = ip6_dst_check, | |
0dbaee3b | 167 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 168 | .mtu = ip6_mtu, |
06582540 | 169 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
170 | .destroy = ip6_dst_destroy, |
171 | .ifdown = ip6_dst_ifdown, | |
172 | .negative_advice = ip6_negative_advice, | |
173 | .link_failure = ip6_link_failure, | |
174 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 175 | .redirect = rt6_do_redirect, |
1ac06e03 | 176 | .local_out = __ip6_local_out, |
d3aaeb38 | 177 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
178 | }; |
179 | ||
ebb762f2 | 180 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 181 | { |
618f9bc7 SK |
182 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
183 | ||
184 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
185 | } |
186 | ||
6700c270 DM |
187 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
188 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
189 | { |
190 | } | |
191 | ||
6700c270 DM |
192 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
193 | struct sk_buff *skb) | |
b587ee3b DM |
194 | { |
195 | } | |
196 | ||
0972ddb2 HB |
197 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
198 | unsigned long old) | |
199 | { | |
200 | return NULL; | |
201 | } | |
202 | ||
14e50e57 DM |
203 | static struct dst_ops ip6_dst_blackhole_ops = { |
204 | .family = AF_INET6, | |
09640e63 | 205 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
206 | .destroy = ip6_dst_destroy, |
207 | .check = ip6_dst_check, | |
ebb762f2 | 208 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 209 | .default_advmss = ip6_default_advmss, |
14e50e57 | 210 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 211 | .redirect = ip6_rt_blackhole_redirect, |
0972ddb2 | 212 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 213 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
214 | }; |
215 | ||
62fa8a84 | 216 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 217 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
218 | }; |
219 | ||
fb0af4c7 | 220 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
221 | .dst = { |
222 | .__refcnt = ATOMIC_INIT(1), | |
223 | .__use = 1, | |
2c20cbd7 | 224 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 225 | .error = -ENETUNREACH, |
d8d1f30b CG |
226 | .input = ip6_pkt_discard, |
227 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
228 | }, |
229 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 230 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
231 | .rt6i_metric = ~(u32) 0, |
232 | .rt6i_ref = ATOMIC_INIT(1), | |
233 | }; | |
234 | ||
101367c2 TG |
235 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
236 | ||
fb0af4c7 | 237 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
238 | .dst = { |
239 | .__refcnt = ATOMIC_INIT(1), | |
240 | .__use = 1, | |
2c20cbd7 | 241 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 242 | .error = -EACCES, |
d8d1f30b CG |
243 | .input = ip6_pkt_prohibit, |
244 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
245 | }, |
246 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 247 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
248 | .rt6i_metric = ~(u32) 0, |
249 | .rt6i_ref = ATOMIC_INIT(1), | |
250 | }; | |
251 | ||
fb0af4c7 | 252 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
253 | .dst = { |
254 | .__refcnt = ATOMIC_INIT(1), | |
255 | .__use = 1, | |
2c20cbd7 | 256 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 257 | .error = -EINVAL, |
d8d1f30b CG |
258 | .input = dst_discard, |
259 | .output = dst_discard, | |
101367c2 TG |
260 | }, |
261 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 262 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
263 | .rt6i_metric = ~(u32) 0, |
264 | .rt6i_ref = ATOMIC_INIT(1), | |
265 | }; | |
266 | ||
267 | #endif | |
268 | ||
1da177e4 | 269 | /* allocate dst with ip6_dst_ops */ |
97bab73f | 270 | static inline struct rt6_info *ip6_dst_alloc(struct net *net, |
957c665f | 271 | struct net_device *dev, |
8b96d22d DM |
272 | int flags, |
273 | struct fib6_table *table) | |
1da177e4 | 274 | { |
97bab73f | 275 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 276 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 277 | |
97bab73f | 278 | if (rt) { |
8104891b SK |
279 | struct dst_entry *dst = &rt->dst; |
280 | ||
281 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
8b96d22d | 282 | rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers); |
6f3118b5 | 283 | rt->rt6i_genid = rt_genid(net); |
51ebd318 ND |
284 | INIT_LIST_HEAD(&rt->rt6i_siblings); |
285 | rt->rt6i_nsiblings = 0; | |
97bab73f | 286 | } |
cf911662 | 287 | return rt; |
1da177e4 LT |
288 | } |
289 | ||
290 | static void ip6_dst_destroy(struct dst_entry *dst) | |
291 | { | |
292 | struct rt6_info *rt = (struct rt6_info *)dst; | |
293 | struct inet6_dev *idev = rt->rt6i_idev; | |
ecd98837 | 294 | struct dst_entry *from = dst->from; |
1da177e4 | 295 | |
8e2ec639 YZ |
296 | if (!(rt->dst.flags & DST_HOST)) |
297 | dst_destroy_metrics_generic(dst); | |
298 | ||
38308473 | 299 | if (idev) { |
1da177e4 LT |
300 | rt->rt6i_idev = NULL; |
301 | in6_dev_put(idev); | |
1ab1457c | 302 | } |
1716a961 | 303 | |
ecd98837 YH |
304 | dst->from = NULL; |
305 | dst_release(from); | |
1716a961 | 306 | |
97bab73f DM |
307 | if (rt6_has_peer(rt)) { |
308 | struct inet_peer *peer = rt6_peer_ptr(rt); | |
b3419363 DM |
309 | inet_putpeer(peer); |
310 | } | |
311 | } | |
312 | ||
313 | void rt6_bind_peer(struct rt6_info *rt, int create) | |
314 | { | |
97bab73f | 315 | struct inet_peer_base *base; |
b3419363 DM |
316 | struct inet_peer *peer; |
317 | ||
97bab73f DM |
318 | base = inetpeer_base_ptr(rt->_rt6i_peer); |
319 | if (!base) | |
320 | return; | |
321 | ||
322 | peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create); | |
7b34ca2a DM |
323 | if (peer) { |
324 | if (!rt6_set_peer(rt, peer)) | |
325 | inet_putpeer(peer); | |
7b34ca2a | 326 | } |
1da177e4 LT |
327 | } |
328 | ||
329 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
330 | int how) | |
331 | { | |
332 | struct rt6_info *rt = (struct rt6_info *)dst; | |
333 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 334 | struct net_device *loopback_dev = |
c346dca1 | 335 | dev_net(dev)->loopback_dev; |
1da177e4 | 336 | |
97cac082 DM |
337 | if (dev != loopback_dev) { |
338 | if (idev && idev->dev == dev) { | |
339 | struct inet6_dev *loopback_idev = | |
340 | in6_dev_get(loopback_dev); | |
341 | if (loopback_idev) { | |
342 | rt->rt6i_idev = loopback_idev; | |
343 | in6_dev_put(idev); | |
344 | } | |
345 | } | |
1da177e4 LT |
346 | } |
347 | } | |
348 | ||
a50feda5 | 349 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 350 | { |
1716a961 G |
351 | if (rt->rt6i_flags & RTF_EXPIRES) { |
352 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 353 | return true; |
1716a961 | 354 | } else if (rt->dst.from) { |
3fd91fb3 | 355 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 356 | } |
a50feda5 | 357 | return false; |
1da177e4 LT |
358 | } |
359 | ||
a50feda5 | 360 | static bool rt6_need_strict(const struct in6_addr *daddr) |
c71099ac | 361 | { |
a02cec21 ED |
362 | return ipv6_addr_type(daddr) & |
363 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
364 | } |
365 | ||
51ebd318 ND |
366 | /* Multipath route selection: |
367 | * Hash based function using packet header and flowlabel. | |
368 | * Adapted from fib_info_hashfn() | |
369 | */ | |
370 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
371 | const struct flowi6 *fl6) | |
372 | { | |
373 | unsigned int val = fl6->flowi6_proto; | |
374 | ||
c08977bb YH |
375 | val ^= ipv6_addr_hash(&fl6->daddr); |
376 | val ^= ipv6_addr_hash(&fl6->saddr); | |
51ebd318 ND |
377 | |
378 | /* Work only if this not encapsulated */ | |
379 | switch (fl6->flowi6_proto) { | |
380 | case IPPROTO_UDP: | |
381 | case IPPROTO_TCP: | |
382 | case IPPROTO_SCTP: | |
b3ce5ae1 ND |
383 | val ^= (__force u16)fl6->fl6_sport; |
384 | val ^= (__force u16)fl6->fl6_dport; | |
51ebd318 ND |
385 | break; |
386 | ||
387 | case IPPROTO_ICMPV6: | |
b3ce5ae1 ND |
388 | val ^= (__force u16)fl6->fl6_icmp_type; |
389 | val ^= (__force u16)fl6->fl6_icmp_code; | |
51ebd318 ND |
390 | break; |
391 | } | |
392 | /* RFC6438 recommands to use flowlabel */ | |
b3ce5ae1 | 393 | val ^= (__force u32)fl6->flowlabel; |
51ebd318 ND |
394 | |
395 | /* Perhaps, we need to tune, this function? */ | |
396 | val = val ^ (val >> 7) ^ (val >> 12); | |
397 | return val % candidate_count; | |
398 | } | |
399 | ||
400 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
401 | struct flowi6 *fl6) | |
402 | { | |
403 | struct rt6_info *sibling, *next_sibling; | |
404 | int route_choosen; | |
405 | ||
406 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
407 | /* Don't change the route, if route_choosen == 0 | |
408 | * (siblings does not include ourself) | |
409 | */ | |
410 | if (route_choosen) | |
411 | list_for_each_entry_safe(sibling, next_sibling, | |
412 | &match->rt6i_siblings, rt6i_siblings) { | |
413 | route_choosen--; | |
414 | if (route_choosen == 0) { | |
415 | match = sibling; | |
416 | break; | |
417 | } | |
418 | } | |
419 | return match; | |
420 | } | |
421 | ||
1da177e4 | 422 | /* |
c71099ac | 423 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
424 | */ |
425 | ||
8ed67789 DL |
426 | static inline struct rt6_info *rt6_device_match(struct net *net, |
427 | struct rt6_info *rt, | |
b71d1d42 | 428 | const struct in6_addr *saddr, |
1da177e4 | 429 | int oif, |
d420895e | 430 | int flags) |
1da177e4 LT |
431 | { |
432 | struct rt6_info *local = NULL; | |
433 | struct rt6_info *sprt; | |
434 | ||
dd3abc4e YH |
435 | if (!oif && ipv6_addr_any(saddr)) |
436 | goto out; | |
437 | ||
d8d1f30b | 438 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 439 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
440 | |
441 | if (oif) { | |
1da177e4 LT |
442 | if (dev->ifindex == oif) |
443 | return sprt; | |
444 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 445 | if (!sprt->rt6i_idev || |
1da177e4 | 446 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 447 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 448 | continue; |
1ab1457c | 449 | if (local && (!oif || |
1da177e4 LT |
450 | local->rt6i_idev->dev->ifindex == oif)) |
451 | continue; | |
452 | } | |
453 | local = sprt; | |
454 | } | |
dd3abc4e YH |
455 | } else { |
456 | if (ipv6_chk_addr(net, saddr, dev, | |
457 | flags & RT6_LOOKUP_F_IFACE)) | |
458 | return sprt; | |
1da177e4 | 459 | } |
dd3abc4e | 460 | } |
1da177e4 | 461 | |
dd3abc4e | 462 | if (oif) { |
1da177e4 LT |
463 | if (local) |
464 | return local; | |
465 | ||
d420895e | 466 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 467 | return net->ipv6.ip6_null_entry; |
1da177e4 | 468 | } |
dd3abc4e | 469 | out: |
1da177e4 LT |
470 | return rt; |
471 | } | |
472 | ||
27097255 | 473 | #ifdef CONFIG_IPV6_ROUTER_PREF |
8df627da HFS |
474 | struct __rt6_probe_work { |
475 | struct work_struct work; | |
476 | struct in6_addr target; | |
477 | struct net_device *dev; | |
478 | }; | |
479 | ||
480 | static void rt6_probe_deferred(struct work_struct *w) | |
481 | { | |
482 | struct in6_addr mcaddr; | |
483 | struct __rt6_probe_work *work = | |
484 | container_of(w, struct __rt6_probe_work, work); | |
485 | ||
486 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
487 | ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL); | |
488 | dev_put(work->dev); | |
489 | kfree(w); | |
490 | } | |
491 | ||
27097255 YH |
492 | static void rt6_probe(struct rt6_info *rt) |
493 | { | |
f2c31e32 | 494 | struct neighbour *neigh; |
27097255 YH |
495 | /* |
496 | * Okay, this does not seem to be appropriate | |
497 | * for now, however, we need to check if it | |
498 | * is really so; aka Router Reachability Probing. | |
499 | * | |
500 | * Router Reachability Probe MUST be rate-limited | |
501 | * to no more than one per minute. | |
502 | */ | |
2152caea | 503 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 504 | return; |
2152caea YH |
505 | rcu_read_lock_bh(); |
506 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
507 | if (neigh) { | |
508 | write_lock(&neigh->lock); | |
509 | if (neigh->nud_state & NUD_VALID) | |
510 | goto out; | |
7ff74a59 | 511 | } |
2152caea YH |
512 | |
513 | if (!neigh || | |
52e16356 | 514 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
8df627da | 515 | struct __rt6_probe_work *work; |
27097255 | 516 | |
8df627da HFS |
517 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
518 | ||
519 | if (neigh && work) | |
b820bb6b | 520 | neigh->updated = jiffies; |
8df627da HFS |
521 | |
522 | if (neigh) | |
2152caea YH |
523 | write_unlock(&neigh->lock); |
524 | ||
8df627da HFS |
525 | if (work) { |
526 | INIT_WORK(&work->work, rt6_probe_deferred); | |
527 | work->target = rt->rt6i_gateway; | |
528 | dev_hold(rt->dst.dev); | |
529 | work->dev = rt->dst.dev; | |
530 | schedule_work(&work->work); | |
531 | } | |
f2c31e32 | 532 | } else { |
2152caea YH |
533 | out: |
534 | write_unlock(&neigh->lock); | |
f2c31e32 | 535 | } |
2152caea | 536 | rcu_read_unlock_bh(); |
27097255 YH |
537 | } |
538 | #else | |
539 | static inline void rt6_probe(struct rt6_info *rt) | |
540 | { | |
27097255 YH |
541 | } |
542 | #endif | |
543 | ||
1da177e4 | 544 | /* |
554cfb7e | 545 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 546 | */ |
b6f99a21 | 547 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 548 | { |
d1918542 | 549 | struct net_device *dev = rt->dst.dev; |
161980f4 | 550 | if (!oif || dev->ifindex == oif) |
554cfb7e | 551 | return 2; |
161980f4 DM |
552 | if ((dev->flags & IFF_LOOPBACK) && |
553 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
554 | return 1; | |
555 | return 0; | |
554cfb7e | 556 | } |
1da177e4 | 557 | |
b4f1489e | 558 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 559 | { |
f2c31e32 | 560 | struct neighbour *neigh; |
b4f1489e | 561 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 562 | |
4d0c5911 YH |
563 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
564 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
b4f1489e | 565 | return RT6_NUD_SUCCEED; |
145a3621 YH |
566 | |
567 | rcu_read_lock_bh(); | |
568 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
569 | if (neigh) { | |
570 | read_lock(&neigh->lock); | |
554cfb7e | 571 | if (neigh->nud_state & NUD_VALID) |
b4f1489e | 572 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 573 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 574 | else if (!(neigh->nud_state & NUD_FAILED)) |
b4f1489e | 575 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 576 | #endif |
145a3621 | 577 | read_unlock(&neigh->lock); |
b4f1489e HFS |
578 | } else { |
579 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
580 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_SOFT; | |
a5a81f0b | 581 | } |
145a3621 YH |
582 | rcu_read_unlock_bh(); |
583 | ||
a5a81f0b | 584 | return ret; |
1da177e4 LT |
585 | } |
586 | ||
554cfb7e YH |
587 | static int rt6_score_route(struct rt6_info *rt, int oif, |
588 | int strict) | |
1da177e4 | 589 | { |
a5a81f0b | 590 | int m; |
1ab1457c | 591 | |
4d0c5911 | 592 | m = rt6_check_dev(rt, oif); |
77d16f45 | 593 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
b4f1489e | 594 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
595 | #ifdef CONFIG_IPV6_ROUTER_PREF |
596 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
597 | #endif | |
b4f1489e HFS |
598 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
599 | int n = rt6_check_neigh(rt); | |
600 | if (n < 0) | |
601 | return n; | |
602 | } | |
554cfb7e YH |
603 | return m; |
604 | } | |
605 | ||
f11e6659 | 606 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
b4f1489e HFS |
607 | int *mpri, struct rt6_info *match, |
608 | bool *do_rr) | |
554cfb7e | 609 | { |
f11e6659 | 610 | int m; |
b4f1489e | 611 | bool match_do_rr = false; |
f11e6659 DM |
612 | |
613 | if (rt6_check_expired(rt)) | |
614 | goto out; | |
615 | ||
616 | m = rt6_score_route(rt, oif, strict); | |
b4f1489e HFS |
617 | if (m == RT6_NUD_FAIL_SOFT && !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF)) { |
618 | match_do_rr = true; | |
619 | m = 0; /* lowest valid score */ | |
620 | } else if (m < 0) { | |
f11e6659 | 621 | goto out; |
b4f1489e HFS |
622 | } |
623 | ||
624 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
625 | rt6_probe(rt); | |
f11e6659 DM |
626 | |
627 | if (m > *mpri) { | |
b4f1489e | 628 | *do_rr = match_do_rr; |
f11e6659 DM |
629 | *mpri = m; |
630 | match = rt; | |
f11e6659 | 631 | } |
f11e6659 DM |
632 | out: |
633 | return match; | |
634 | } | |
635 | ||
636 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
637 | struct rt6_info *rr_head, | |
b4f1489e HFS |
638 | u32 metric, int oif, int strict, |
639 | bool *do_rr) | |
f11e6659 DM |
640 | { |
641 | struct rt6_info *rt, *match; | |
554cfb7e | 642 | int mpri = -1; |
1da177e4 | 643 | |
f11e6659 DM |
644 | match = NULL; |
645 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 646 | rt = rt->dst.rt6_next) |
b4f1489e | 647 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
f11e6659 | 648 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; |
d8d1f30b | 649 | rt = rt->dst.rt6_next) |
b4f1489e | 650 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 651 | |
f11e6659 DM |
652 | return match; |
653 | } | |
1da177e4 | 654 | |
f11e6659 DM |
655 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
656 | { | |
657 | struct rt6_info *match, *rt0; | |
8ed67789 | 658 | struct net *net; |
b4f1489e | 659 | bool do_rr = false; |
1da177e4 | 660 | |
f11e6659 DM |
661 | rt0 = fn->rr_ptr; |
662 | if (!rt0) | |
663 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 664 | |
b4f1489e HFS |
665 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
666 | &do_rr); | |
1da177e4 | 667 | |
b4f1489e | 668 | if (do_rr) { |
d8d1f30b | 669 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 670 | |
554cfb7e | 671 | /* no entries matched; do round-robin */ |
f11e6659 DM |
672 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
673 | next = fn->leaf; | |
674 | ||
675 | if (next != rt0) | |
676 | fn->rr_ptr = next; | |
1da177e4 | 677 | } |
1da177e4 | 678 | |
d1918542 | 679 | net = dev_net(rt0->dst.dev); |
a02cec21 | 680 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
681 | } |
682 | ||
70ceb4f5 YH |
683 | #ifdef CONFIG_IPV6_ROUTE_INFO |
684 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 685 | const struct in6_addr *gwaddr) |
70ceb4f5 YH |
686 | { |
687 | struct route_info *rinfo = (struct route_info *) opt; | |
688 | struct in6_addr prefix_buf, *prefix; | |
689 | unsigned int pref; | |
4bed72e4 | 690 | unsigned long lifetime; |
70ceb4f5 YH |
691 | struct rt6_info *rt; |
692 | ||
693 | if (len < sizeof(struct route_info)) { | |
694 | return -EINVAL; | |
695 | } | |
696 | ||
697 | /* Sanity check for prefix_len and length */ | |
698 | if (rinfo->length > 3) { | |
699 | return -EINVAL; | |
700 | } else if (rinfo->prefix_len > 128) { | |
701 | return -EINVAL; | |
702 | } else if (rinfo->prefix_len > 64) { | |
703 | if (rinfo->length < 2) { | |
704 | return -EINVAL; | |
705 | } | |
706 | } else if (rinfo->prefix_len > 0) { | |
707 | if (rinfo->length < 1) { | |
708 | return -EINVAL; | |
709 | } | |
710 | } | |
711 | ||
712 | pref = rinfo->route_pref; | |
713 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 714 | return -EINVAL; |
70ceb4f5 | 715 | |
4bed72e4 | 716 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
717 | |
718 | if (rinfo->length == 3) | |
719 | prefix = (struct in6_addr *)rinfo->prefix; | |
720 | else { | |
721 | /* this function is safe */ | |
722 | ipv6_addr_prefix(&prefix_buf, | |
723 | (struct in6_addr *)rinfo->prefix, | |
724 | rinfo->prefix_len); | |
725 | prefix = &prefix_buf; | |
726 | } | |
727 | ||
ea136c0d DJ |
728 | if (rinfo->prefix_len == 0) |
729 | rt = rt6_get_dflt_router(gwaddr, dev); | |
730 | else | |
6fa3eb70 | 731 | rt = rt6_get_route_info(dev, prefix, rinfo->prefix_len, gwaddr); |
70ceb4f5 YH |
732 | |
733 | if (rt && !lifetime) { | |
e0a1ad73 | 734 | ip6_del_rt(rt); |
70ceb4f5 YH |
735 | rt = NULL; |
736 | } | |
737 | ||
738 | if (!rt && lifetime) | |
6fa3eb70 | 739 | rt = rt6_add_route_info(dev, prefix, rinfo->prefix_len, gwaddr, pref); |
70ceb4f5 YH |
740 | else if (rt) |
741 | rt->rt6i_flags = RTF_ROUTEINFO | | |
742 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
743 | ||
744 | if (rt) { | |
1716a961 G |
745 | if (!addrconf_finite_timeout(lifetime)) |
746 | rt6_clean_expires(rt); | |
747 | else | |
748 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
749 | ||
94e187c0 | 750 | ip6_rt_put(rt); |
70ceb4f5 YH |
751 | } |
752 | return 0; | |
753 | } | |
754 | #endif | |
755 | ||
8ed67789 | 756 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 757 | do { \ |
8ed67789 | 758 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 759 | struct fib6_node *pn; \ |
e0eda7bb | 760 | while (1) { \ |
982f56f3 YH |
761 | if (fn->fn_flags & RTN_TL_ROOT) \ |
762 | goto out; \ | |
763 | pn = fn->parent; \ | |
764 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 765 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
766 | else \ |
767 | fn = pn; \ | |
768 | if (fn->fn_flags & RTN_RTINFO) \ | |
769 | goto restart; \ | |
c71099ac | 770 | } \ |
c71099ac | 771 | } \ |
38308473 | 772 | } while (0) |
c71099ac | 773 | |
8ed67789 DL |
774 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
775 | struct fib6_table *table, | |
4c9483b2 | 776 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
777 | { |
778 | struct fib6_node *fn; | |
779 | struct rt6_info *rt; | |
780 | ||
c71099ac | 781 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 782 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
783 | restart: |
784 | rt = fn->leaf; | |
4c9483b2 | 785 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 ND |
786 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
787 | rt = rt6_multipath_select(rt, fl6); | |
4c9483b2 | 788 | BACKTRACK(net, &fl6->saddr); |
c71099ac | 789 | out: |
d8d1f30b | 790 | dst_use(&rt->dst, jiffies); |
c71099ac | 791 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
792 | return rt; |
793 | ||
794 | } | |
795 | ||
ea6e574e FW |
796 | struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
797 | int flags) | |
798 | { | |
799 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
800 | } | |
801 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
802 | ||
9acd9f3a YH |
803 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
804 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 805 | { |
4c9483b2 DM |
806 | struct flowi6 fl6 = { |
807 | .flowi6_oif = oif, | |
808 | .daddr = *daddr, | |
c71099ac TG |
809 | }; |
810 | struct dst_entry *dst; | |
77d16f45 | 811 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 812 | |
adaa70bb | 813 | if (saddr) { |
4c9483b2 | 814 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
815 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
816 | } | |
817 | ||
4c9483b2 | 818 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
819 | if (dst->error == 0) |
820 | return (struct rt6_info *) dst; | |
821 | ||
822 | dst_release(dst); | |
823 | ||
1da177e4 LT |
824 | return NULL; |
825 | } | |
826 | ||
7159039a YH |
827 | EXPORT_SYMBOL(rt6_lookup); |
828 | ||
c71099ac | 829 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
830 | It takes new route entry, the addition fails by any reason the |
831 | route is freed. In any case, if caller does not hold it, it may | |
832 | be destroyed. | |
833 | */ | |
834 | ||
86872cb5 | 835 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
836 | { |
837 | int err; | |
c71099ac | 838 | struct fib6_table *table; |
1da177e4 | 839 | |
c71099ac TG |
840 | table = rt->rt6i_table; |
841 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 842 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 843 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
844 | |
845 | return err; | |
846 | } | |
847 | ||
40e22e8f TG |
848 | int ip6_ins_rt(struct rt6_info *rt) |
849 | { | |
4d1169c1 | 850 | struct nl_info info = { |
d1918542 | 851 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 852 | }; |
528c4ceb | 853 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
854 | } |
855 | ||
1716a961 | 856 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, |
21efcfa0 | 857 | const struct in6_addr *daddr, |
b71d1d42 | 858 | const struct in6_addr *saddr) |
1da177e4 | 859 | { |
1da177e4 LT |
860 | struct rt6_info *rt; |
861 | ||
862 | /* | |
863 | * Clone the route. | |
864 | */ | |
865 | ||
21efcfa0 | 866 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
867 | |
868 | if (rt) { | |
38308473 | 869 | if (!(rt->rt6i_flags & RTF_GATEWAY)) { |
bb3c3686 | 870 | if (ort->rt6i_dst.plen != 128 && |
21efcfa0 | 871 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) |
58c4fb86 | 872 | rt->rt6i_flags |= RTF_ANYCAST; |
58c4fb86 | 873 | } |
1da177e4 | 874 | |
1da177e4 | 875 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
876 | |
877 | #ifdef CONFIG_IPV6_SUBTREES | |
878 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 879 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
880 | rt->rt6i_src.plen = 128; |
881 | } | |
882 | #endif | |
95a9a5ba | 883 | } |
1da177e4 | 884 | |
95a9a5ba YH |
885 | return rt; |
886 | } | |
1da177e4 | 887 | |
21efcfa0 ED |
888 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
889 | const struct in6_addr *daddr) | |
299d9939 | 890 | { |
21efcfa0 ED |
891 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
892 | ||
887c95cc | 893 | if (rt) |
299d9939 | 894 | rt->rt6i_flags |= RTF_CACHE; |
299d9939 YH |
895 | return rt; |
896 | } | |
897 | ||
8ed67789 | 898 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 899 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
900 | { |
901 | struct fib6_node *fn; | |
519fbd87 | 902 | struct rt6_info *rt, *nrt; |
c71099ac | 903 | int strict = 0; |
1da177e4 | 904 | int attempts = 3; |
519fbd87 | 905 | int err; |
53b7997f | 906 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 907 | |
77d16f45 | 908 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
909 | |
910 | relookup: | |
c71099ac | 911 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 912 | |
8238dd06 | 913 | restart_2: |
4c9483b2 | 914 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
915 | |
916 | restart: | |
4acad72d | 917 | rt = rt6_select(fn, oif, strict | reachable); |
51ebd318 ND |
918 | if (rt->rt6i_nsiblings && oif == 0) |
919 | rt = rt6_multipath_select(rt, fl6); | |
4c9483b2 | 920 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 921 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 922 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 923 | goto out; |
1da177e4 | 924 | |
d8d1f30b | 925 | dst_hold(&rt->dst); |
c71099ac | 926 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 927 | |
c440f160 | 928 | if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY))) |
4c9483b2 | 929 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 930 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 931 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
932 | else |
933 | goto out2; | |
e40cf353 | 934 | |
94e187c0 | 935 | ip6_rt_put(rt); |
8ed67789 | 936 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 937 | |
d8d1f30b | 938 | dst_hold(&rt->dst); |
519fbd87 | 939 | if (nrt) { |
40e22e8f | 940 | err = ip6_ins_rt(nrt); |
519fbd87 | 941 | if (!err) |
1da177e4 | 942 | goto out2; |
1da177e4 | 943 | } |
1da177e4 | 944 | |
519fbd87 YH |
945 | if (--attempts <= 0) |
946 | goto out2; | |
947 | ||
948 | /* | |
c71099ac | 949 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
950 | * released someone could insert this route. Relookup. |
951 | */ | |
94e187c0 | 952 | ip6_rt_put(rt); |
519fbd87 YH |
953 | goto relookup; |
954 | ||
955 | out: | |
8238dd06 YH |
956 | if (reachable) { |
957 | reachable = 0; | |
958 | goto restart_2; | |
959 | } | |
d8d1f30b | 960 | dst_hold(&rt->dst); |
c71099ac | 961 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 962 | out2: |
d8d1f30b CG |
963 | rt->dst.lastuse = jiffies; |
964 | rt->dst.__use++; | |
c71099ac TG |
965 | |
966 | return rt; | |
1da177e4 LT |
967 | } |
968 | ||
8ed67789 | 969 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 970 | struct flowi6 *fl6, int flags) |
4acad72d | 971 | { |
4c9483b2 | 972 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
973 | } |
974 | ||
72331bc0 SL |
975 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
976 | struct net_device *dev, | |
977 | struct flowi6 *fl6, int flags) | |
978 | { | |
979 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
980 | flags |= RT6_LOOKUP_F_IFACE; | |
981 | ||
982 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
983 | } | |
984 | ||
c71099ac TG |
985 | void ip6_route_input(struct sk_buff *skb) |
986 | { | |
b71d1d42 | 987 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 988 | struct net *net = dev_net(skb->dev); |
adaa70bb | 989 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
990 | struct flowi6 fl6 = { |
991 | .flowi6_iif = skb->dev->ifindex, | |
992 | .daddr = iph->daddr, | |
993 | .saddr = iph->saddr, | |
6502ca52 | 994 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
995 | .flowi6_mark = skb->mark, |
996 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 997 | }; |
adaa70bb | 998 | |
72331bc0 | 999 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1000 | } |
1001 | ||
8ed67789 | 1002 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1003 | struct flowi6 *fl6, int flags) |
1da177e4 | 1004 | { |
4c9483b2 | 1005 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1006 | } |
1007 | ||
9c7a4f9c | 1008 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 1009 | struct flowi6 *fl6) |
c71099ac TG |
1010 | { |
1011 | int flags = 0; | |
1012 | ||
1fb9489b | 1013 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1014 | |
4c9483b2 | 1015 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 1016 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1017 | |
4c9483b2 | 1018 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 1019 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1020 | else if (sk) |
1021 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1022 | |
4c9483b2 | 1023 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
1024 | } |
1025 | ||
7159039a | 1026 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 1027 | |
2774c131 | 1028 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1029 | { |
5c1e6aa3 | 1030 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1031 | struct dst_entry *new = NULL; |
1032 | ||
f5b0a874 | 1033 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1034 | if (rt) { |
d8d1f30b | 1035 | new = &rt->dst; |
14e50e57 | 1036 | |
8104891b SK |
1037 | memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); |
1038 | rt6_init_peer(rt, net->ipv6.peers); | |
1039 | ||
14e50e57 | 1040 | new->__use = 1; |
352e512c HX |
1041 | new->input = dst_discard; |
1042 | new->output = dst_discard; | |
14e50e57 | 1043 | |
21efcfa0 ED |
1044 | if (dst_metrics_read_only(&ort->dst)) |
1045 | new->_metrics = ort->dst._metrics; | |
1046 | else | |
1047 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
1048 | rt->rt6i_idev = ort->rt6i_idev; |
1049 | if (rt->rt6i_idev) | |
1050 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1051 | |
4e3fd7a0 | 1052 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 | 1053 | rt->rt6i_flags = ort->rt6i_flags; |
14e50e57 DM |
1054 | rt->rt6i_metric = 0; |
1055 | ||
1056 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1057 | #ifdef CONFIG_IPV6_SUBTREES | |
1058 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1059 | #endif | |
1060 | ||
1061 | dst_free(new); | |
1062 | } | |
1063 | ||
69ead7af DM |
1064 | dst_release(dst_orig); |
1065 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1066 | } |
14e50e57 | 1067 | |
1da177e4 LT |
1068 | /* |
1069 | * Destination cache support functions | |
1070 | */ | |
1071 | ||
1072 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
1073 | { | |
1074 | struct rt6_info *rt; | |
1075 | ||
1076 | rt = (struct rt6_info *) dst; | |
1077 | ||
6f3118b5 ND |
1078 | /* All IPV6 dsts are created with ->obsolete set to the value |
1079 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1080 | * into this function always. | |
1081 | */ | |
1082 | if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev))) | |
1083 | return NULL; | |
1084 | ||
8ffff756 HFS |
1085 | if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) |
1086 | return NULL; | |
a4477c4d | 1087 | |
8ffff756 HFS |
1088 | if (rt6_check_expired(rt)) |
1089 | return NULL; | |
1090 | ||
1091 | return dst; | |
1da177e4 LT |
1092 | } |
1093 | ||
1094 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1095 | { | |
1096 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1097 | ||
1098 | if (rt) { | |
54c1a859 YH |
1099 | if (rt->rt6i_flags & RTF_CACHE) { |
1100 | if (rt6_check_expired(rt)) { | |
1101 | ip6_del_rt(rt); | |
1102 | dst = NULL; | |
1103 | } | |
1104 | } else { | |
1da177e4 | 1105 | dst_release(dst); |
54c1a859 YH |
1106 | dst = NULL; |
1107 | } | |
1da177e4 | 1108 | } |
54c1a859 | 1109 | return dst; |
1da177e4 LT |
1110 | } |
1111 | ||
1112 | static void ip6_link_failure(struct sk_buff *skb) | |
1113 | { | |
1114 | struct rt6_info *rt; | |
1115 | ||
3ffe533c | 1116 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1117 | |
adf30907 | 1118 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1119 | if (rt) { |
a025e28a HFS |
1120 | if (rt->rt6i_flags & RTF_CACHE) { |
1121 | dst_hold(&rt->dst); | |
1122 | if (ip6_del_rt(rt)) | |
1123 | dst_free(&rt->dst); | |
1124 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { | |
1da177e4 | 1125 | rt->rt6i_node->fn_sernum = -1; |
a025e28a | 1126 | } |
1da177e4 LT |
1127 | } |
1128 | } | |
1129 | ||
6700c270 DM |
1130 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1131 | struct sk_buff *skb, u32 mtu) | |
1da177e4 LT |
1132 | { |
1133 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
1134 | ||
81aded24 | 1135 | dst_confirm(dst); |
1da177e4 | 1136 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { |
81aded24 DM |
1137 | struct net *net = dev_net(dst->dev); |
1138 | ||
1da177e4 | 1139 | rt6->rt6i_flags |= RTF_MODIFIED; |
fa3f55df | 1140 | if (mtu < IPV6_MIN_MTU) |
1da177e4 | 1141 | mtu = IPV6_MIN_MTU; |
fa3f55df | 1142 | |
defb3519 | 1143 | dst_metric_set(dst, RTAX_MTU, mtu); |
81aded24 | 1144 | rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1145 | } |
1146 | } | |
1147 | ||
42ae66c8 | 1148 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
6fa3eb70 | 1149 | int oif, u32 mark, kuid_t uid) |
81aded24 DM |
1150 | { |
1151 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1152 | struct dst_entry *dst; | |
1153 | struct flowi6 fl6; | |
1154 | ||
1155 | memset(&fl6, 0, sizeof(fl6)); | |
1156 | fl6.flowi6_oif = oif; | |
6fa3eb70 | 1157 | fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); |
3e12939a | 1158 | fl6.flowi6_flags = 0; |
81aded24 DM |
1159 | fl6.daddr = iph->daddr; |
1160 | fl6.saddr = iph->saddr; | |
6502ca52 | 1161 | fl6.flowlabel = ip6_flowinfo(iph); |
6fa3eb70 | 1162 | fl6.flowi6_uid = uid; |
81aded24 DM |
1163 | |
1164 | dst = ip6_route_output(net, NULL, &fl6); | |
1165 | if (!dst->error) | |
6700c270 | 1166 | ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu)); |
81aded24 DM |
1167 | dst_release(dst); |
1168 | } | |
1169 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1170 | ||
1171 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1172 | { | |
1173 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
6fa3eb70 | 1174 | sk->sk_bound_dev_if, sk->sk_mark, sock_i_uid(sk)); |
81aded24 DM |
1175 | } |
1176 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1177 | ||
3a5ad2ee DM |
1178 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1179 | { | |
1180 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1181 | struct dst_entry *dst; | |
1182 | struct flowi6 fl6; | |
1183 | ||
1184 | memset(&fl6, 0, sizeof(fl6)); | |
1185 | fl6.flowi6_oif = oif; | |
1186 | fl6.flowi6_mark = mark; | |
1187 | fl6.flowi6_flags = 0; | |
1188 | fl6.daddr = iph->daddr; | |
1189 | fl6.saddr = iph->saddr; | |
6502ca52 | 1190 | fl6.flowlabel = ip6_flowinfo(iph); |
3a5ad2ee DM |
1191 | |
1192 | dst = ip6_route_output(net, NULL, &fl6); | |
1193 | if (!dst->error) | |
6700c270 | 1194 | rt6_do_redirect(dst, NULL, skb); |
3a5ad2ee DM |
1195 | dst_release(dst); |
1196 | } | |
1197 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1198 | ||
1199 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1200 | { | |
1201 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1202 | } | |
1203 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1204 | ||
0dbaee3b | 1205 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1206 | { |
0dbaee3b DM |
1207 | struct net_device *dev = dst->dev; |
1208 | unsigned int mtu = dst_mtu(dst); | |
1209 | struct net *net = dev_net(dev); | |
1210 | ||
1da177e4 LT |
1211 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1212 | ||
5578689a DL |
1213 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1214 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1215 | |
1216 | /* | |
1ab1457c YH |
1217 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1218 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1219 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1220 | * rely only on pmtu discovery" |
1221 | */ | |
1222 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1223 | mtu = IPV6_MAXPLEN; | |
1224 | return mtu; | |
1225 | } | |
1226 | ||
ebb762f2 | 1227 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1228 | { |
d33e4553 | 1229 | struct inet6_dev *idev; |
618f9bc7 SK |
1230 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1231 | ||
1232 | if (mtu) | |
132da31a | 1233 | goto out; |
618f9bc7 SK |
1234 | |
1235 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1236 | |
1237 | rcu_read_lock(); | |
1238 | idev = __in6_dev_get(dst->dev); | |
1239 | if (idev) | |
1240 | mtu = idev->cnf.mtu6; | |
1241 | rcu_read_unlock(); | |
1242 | ||
132da31a ED |
1243 | out: |
1244 | return min_t(unsigned int, mtu, IP6_MAX_MTU); | |
d33e4553 DM |
1245 | } |
1246 | ||
3b00944c YH |
1247 | static struct dst_entry *icmp6_dst_gc_list; |
1248 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1249 | |
3b00944c | 1250 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1251 | struct flowi6 *fl6) |
1da177e4 | 1252 | { |
87a11578 | 1253 | struct dst_entry *dst; |
1da177e4 LT |
1254 | struct rt6_info *rt; |
1255 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1256 | struct net *net = dev_net(dev); |
1da177e4 | 1257 | |
38308473 | 1258 | if (unlikely(!idev)) |
122bdf67 | 1259 | return ERR_PTR(-ENODEV); |
1da177e4 | 1260 | |
8b96d22d | 1261 | rt = ip6_dst_alloc(net, dev, 0, NULL); |
38308473 | 1262 | if (unlikely(!rt)) { |
1da177e4 | 1263 | in6_dev_put(idev); |
87a11578 | 1264 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1265 | goto out; |
1266 | } | |
1267 | ||
8e2ec639 YZ |
1268 | rt->dst.flags |= DST_HOST; |
1269 | rt->dst.output = ip6_output; | |
d8d1f30b | 1270 | atomic_set(&rt->dst.__refcnt, 1); |
044d6efb | 1271 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 1272 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1273 | rt->rt6i_dst.plen = 128; |
1274 | rt->rt6i_idev = idev; | |
14edd87d | 1275 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1276 | |
3b00944c | 1277 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1278 | rt->dst.next = icmp6_dst_gc_list; |
1279 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1280 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1281 | |
5578689a | 1282 | fib6_force_start_gc(net); |
1da177e4 | 1283 | |
87a11578 DM |
1284 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1285 | ||
1da177e4 | 1286 | out: |
87a11578 | 1287 | return dst; |
1da177e4 LT |
1288 | } |
1289 | ||
3d0f24a7 | 1290 | int icmp6_dst_gc(void) |
1da177e4 | 1291 | { |
e9476e95 | 1292 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1293 | int more = 0; |
1da177e4 | 1294 | |
3b00944c YH |
1295 | spin_lock_bh(&icmp6_dst_lock); |
1296 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1297 | |
1da177e4 LT |
1298 | while ((dst = *pprev) != NULL) { |
1299 | if (!atomic_read(&dst->__refcnt)) { | |
1300 | *pprev = dst->next; | |
1301 | dst_free(dst); | |
1da177e4 LT |
1302 | } else { |
1303 | pprev = &dst->next; | |
3d0f24a7 | 1304 | ++more; |
1da177e4 LT |
1305 | } |
1306 | } | |
1307 | ||
3b00944c | 1308 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1309 | |
3d0f24a7 | 1310 | return more; |
1da177e4 LT |
1311 | } |
1312 | ||
1e493d19 DM |
1313 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1314 | void *arg) | |
1315 | { | |
1316 | struct dst_entry *dst, **pprev; | |
1317 | ||
1318 | spin_lock_bh(&icmp6_dst_lock); | |
1319 | pprev = &icmp6_dst_gc_list; | |
1320 | while ((dst = *pprev) != NULL) { | |
1321 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1322 | if (func(rt, arg)) { | |
1323 | *pprev = dst->next; | |
1324 | dst_free(dst); | |
1325 | } else { | |
1326 | pprev = &dst->next; | |
1327 | } | |
1328 | } | |
1329 | spin_unlock_bh(&icmp6_dst_lock); | |
1330 | } | |
1331 | ||
569d3645 | 1332 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1333 | { |
86393e52 | 1334 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1335 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1336 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1337 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1338 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1339 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1340 | int entries; |
7019b78e | 1341 | |
fc66f95c | 1342 | entries = dst_entries_get_fast(ops); |
c1e1eb15 | 1343 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 1344 | entries <= rt_max_size) |
1da177e4 LT |
1345 | goto out; |
1346 | ||
6891a346 | 1347 | net->ipv6.ip6_rt_gc_expire++; |
ba310bc8 | 1348 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size); |
fc66f95c ED |
1349 | entries = dst_entries_get_slow(ops); |
1350 | if (entries < ops->gc_thresh) | |
7019b78e | 1351 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1352 | out: |
7019b78e | 1353 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1354 | return entries > rt_max_size; |
1da177e4 LT |
1355 | } |
1356 | ||
6b75d090 | 1357 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1358 | { |
5170ae82 | 1359 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1360 | if (hoplimit == 0) { |
6b75d090 | 1361 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1362 | struct inet6_dev *idev; |
1363 | ||
1364 | rcu_read_lock(); | |
1365 | idev = __in6_dev_get(dev); | |
1366 | if (idev) | |
6b75d090 | 1367 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1368 | else |
53b7997f | 1369 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1370 | rcu_read_unlock(); |
1da177e4 LT |
1371 | } |
1372 | return hoplimit; | |
1373 | } | |
abbf46ae | 1374 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1375 | |
1376 | /* | |
1377 | * | |
1378 | */ | |
1379 | ||
86872cb5 | 1380 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1381 | { |
1382 | int err; | |
5578689a | 1383 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1384 | struct rt6_info *rt = NULL; |
1385 | struct net_device *dev = NULL; | |
1386 | struct inet6_dev *idev = NULL; | |
c71099ac | 1387 | struct fib6_table *table; |
1da177e4 LT |
1388 | int addr_type; |
1389 | ||
86872cb5 | 1390 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1391 | return -EINVAL; |
1392 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1393 | if (cfg->fc_src_len) |
1da177e4 LT |
1394 | return -EINVAL; |
1395 | #endif | |
86872cb5 | 1396 | if (cfg->fc_ifindex) { |
1da177e4 | 1397 | err = -ENODEV; |
5578689a | 1398 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1399 | if (!dev) |
1400 | goto out; | |
1401 | idev = in6_dev_get(dev); | |
1402 | if (!idev) | |
1403 | goto out; | |
1404 | } | |
1405 | ||
86872cb5 TG |
1406 | if (cfg->fc_metric == 0) |
1407 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1408 | |
d71314b4 | 1409 | err = -ENOBUFS; |
38308473 DM |
1410 | if (cfg->fc_nlinfo.nlh && |
1411 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1412 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1413 | if (!table) { |
f3213831 | 1414 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1415 | table = fib6_new_table(net, cfg->fc_table); |
1416 | } | |
1417 | } else { | |
1418 | table = fib6_new_table(net, cfg->fc_table); | |
1419 | } | |
38308473 DM |
1420 | |
1421 | if (!table) | |
c71099ac | 1422 | goto out; |
c71099ac | 1423 | |
8f41e6a8 | 1424 | rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table); |
1da177e4 | 1425 | |
38308473 | 1426 | if (!rt) { |
1da177e4 LT |
1427 | err = -ENOMEM; |
1428 | goto out; | |
1429 | } | |
1430 | ||
1716a961 G |
1431 | if (cfg->fc_flags & RTF_EXPIRES) |
1432 | rt6_set_expires(rt, jiffies + | |
1433 | clock_t_to_jiffies(cfg->fc_expires)); | |
1434 | else | |
1435 | rt6_clean_expires(rt); | |
1da177e4 | 1436 | |
86872cb5 TG |
1437 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1438 | cfg->fc_protocol = RTPROT_BOOT; | |
1439 | rt->rt6i_protocol = cfg->fc_protocol; | |
1440 | ||
1441 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1442 | |
1443 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1444 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1445 | else if (cfg->fc_flags & RTF_LOCAL) |
1446 | rt->dst.input = ip6_input; | |
1da177e4 | 1447 | else |
d8d1f30b | 1448 | rt->dst.input = ip6_forward; |
1da177e4 | 1449 | |
d8d1f30b | 1450 | rt->dst.output = ip6_output; |
1da177e4 | 1451 | |
86872cb5 TG |
1452 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1453 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1454 | if (rt->rt6i_dst.plen == 128) |
11d53b49 | 1455 | rt->dst.flags |= DST_HOST; |
1da177e4 | 1456 | |
8e2ec639 YZ |
1457 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
1458 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1459 | if (!metrics) { | |
1460 | err = -ENOMEM; | |
1461 | goto out; | |
1462 | } | |
1463 | dst_init_metrics(&rt->dst, metrics, 0); | |
1464 | } | |
1da177e4 | 1465 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1466 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1467 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1468 | #endif |
1469 | ||
86872cb5 | 1470 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1471 | |
1472 | /* We cannot add true routes via loopback here, | |
1473 | they would result in kernel looping; promote them to reject routes | |
1474 | */ | |
86872cb5 | 1475 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1476 | (dev && (dev->flags & IFF_LOOPBACK) && |
1477 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1478 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1479 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1480 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1481 | if (dev) { |
1482 | dev_put(dev); | |
1483 | in6_dev_put(idev); | |
1484 | } | |
5578689a | 1485 | dev = net->loopback_dev; |
1da177e4 LT |
1486 | dev_hold(dev); |
1487 | idev = in6_dev_get(dev); | |
1488 | if (!idev) { | |
1489 | err = -ENODEV; | |
1490 | goto out; | |
1491 | } | |
1492 | } | |
1da177e4 | 1493 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1494 | switch (cfg->fc_type) { |
1495 | case RTN_BLACKHOLE: | |
1496 | rt->dst.error = -EINVAL; | |
5af58eb0 K |
1497 | rt->dst.output = dst_discard; |
1498 | rt->dst.input = dst_discard; | |
ef2c7d7b ND |
1499 | break; |
1500 | case RTN_PROHIBIT: | |
1501 | rt->dst.error = -EACCES; | |
5af58eb0 K |
1502 | rt->dst.output = ip6_pkt_prohibit_out; |
1503 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 1504 | break; |
b4949ab2 | 1505 | case RTN_THROW: |
ef2c7d7b | 1506 | default: |
5af58eb0 K |
1507 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
1508 | : -ENETUNREACH; | |
1509 | rt->dst.output = ip6_pkt_discard_out; | |
1510 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
1511 | break; |
1512 | } | |
1da177e4 LT |
1513 | goto install_route; |
1514 | } | |
1515 | ||
86872cb5 | 1516 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1517 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1518 | int gwa_type; |
1519 | ||
86872cb5 | 1520 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1521 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1522 | gwa_type = ipv6_addr_type(gw_addr); |
1523 | ||
1524 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1525 | struct rt6_info *grt; | |
1526 | ||
1527 | /* IPv6 strictly inhibits using not link-local | |
1528 | addresses as nexthop address. | |
1529 | Otherwise, router will not able to send redirects. | |
1530 | It is very good, but in some (rare!) circumstances | |
1531 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1532 | some exceptions. --ANK | |
1533 | */ | |
1534 | err = -EINVAL; | |
38308473 | 1535 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1536 | goto out; |
1537 | ||
5578689a | 1538 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1539 | |
1540 | err = -EHOSTUNREACH; | |
38308473 | 1541 | if (!grt) |
1da177e4 LT |
1542 | goto out; |
1543 | if (dev) { | |
d1918542 | 1544 | if (dev != grt->dst.dev) { |
94e187c0 | 1545 | ip6_rt_put(grt); |
1da177e4 LT |
1546 | goto out; |
1547 | } | |
1548 | } else { | |
d1918542 | 1549 | dev = grt->dst.dev; |
1da177e4 LT |
1550 | idev = grt->rt6i_idev; |
1551 | dev_hold(dev); | |
1552 | in6_dev_hold(grt->rt6i_idev); | |
1553 | } | |
38308473 | 1554 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1555 | err = 0; |
94e187c0 | 1556 | ip6_rt_put(grt); |
1da177e4 LT |
1557 | |
1558 | if (err) | |
1559 | goto out; | |
1560 | } | |
1561 | err = -EINVAL; | |
38308473 | 1562 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1563 | goto out; |
1564 | } | |
1565 | ||
1566 | err = -ENODEV; | |
38308473 | 1567 | if (!dev) |
1da177e4 LT |
1568 | goto out; |
1569 | ||
c3968a85 DW |
1570 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1571 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1572 | err = -EINVAL; | |
1573 | goto out; | |
1574 | } | |
4e3fd7a0 | 1575 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1576 | rt->rt6i_prefsrc.plen = 128; |
1577 | } else | |
1578 | rt->rt6i_prefsrc.plen = 0; | |
1579 | ||
86872cb5 | 1580 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1581 | |
1582 | install_route: | |
86872cb5 TG |
1583 | if (cfg->fc_mx) { |
1584 | struct nlattr *nla; | |
1585 | int remaining; | |
1586 | ||
1587 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1588 | int type = nla_type(nla); |
86872cb5 TG |
1589 | |
1590 | if (type) { | |
1591 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1592 | err = -EINVAL; |
1593 | goto out; | |
1594 | } | |
86872cb5 | 1595 | |
defb3519 | 1596 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1597 | } |
1da177e4 LT |
1598 | } |
1599 | } | |
1600 | ||
d8d1f30b | 1601 | rt->dst.dev = dev; |
1da177e4 | 1602 | rt->rt6i_idev = idev; |
c71099ac | 1603 | rt->rt6i_table = table; |
63152fc0 | 1604 | |
c346dca1 | 1605 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1606 | |
86872cb5 | 1607 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1608 | |
1609 | out: | |
1610 | if (dev) | |
1611 | dev_put(dev); | |
1612 | if (idev) | |
1613 | in6_dev_put(idev); | |
1614 | if (rt) | |
d8d1f30b | 1615 | dst_free(&rt->dst); |
1da177e4 LT |
1616 | return err; |
1617 | } | |
1618 | ||
86872cb5 | 1619 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1620 | { |
1621 | int err; | |
c71099ac | 1622 | struct fib6_table *table; |
d1918542 | 1623 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1624 | |
6825a26c G |
1625 | if (rt == net->ipv6.ip6_null_entry) { |
1626 | err = -ENOENT; | |
1627 | goto out; | |
1628 | } | |
6c813a72 | 1629 | |
c71099ac TG |
1630 | table = rt->rt6i_table; |
1631 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 1632 | err = fib6_del(rt, info); |
c71099ac | 1633 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 1634 | |
6825a26c | 1635 | out: |
94e187c0 | 1636 | ip6_rt_put(rt); |
1da177e4 LT |
1637 | return err; |
1638 | } | |
1639 | ||
e0a1ad73 TG |
1640 | int ip6_del_rt(struct rt6_info *rt) |
1641 | { | |
4d1169c1 | 1642 | struct nl_info info = { |
d1918542 | 1643 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1644 | }; |
528c4ceb | 1645 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1646 | } |
1647 | ||
86872cb5 | 1648 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1649 | { |
c71099ac | 1650 | struct fib6_table *table; |
1da177e4 LT |
1651 | struct fib6_node *fn; |
1652 | struct rt6_info *rt; | |
1653 | int err = -ESRCH; | |
1654 | ||
5578689a | 1655 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1656 | if (!table) |
c71099ac TG |
1657 | return err; |
1658 | ||
1659 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1660 | |
c71099ac | 1661 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1662 | &cfg->fc_dst, cfg->fc_dst_len, |
1663 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1664 | |
1da177e4 | 1665 | if (fn) { |
d8d1f30b | 1666 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1667 | if (cfg->fc_ifindex && |
d1918542 DM |
1668 | (!rt->dst.dev || |
1669 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1670 | continue; |
86872cb5 TG |
1671 | if (cfg->fc_flags & RTF_GATEWAY && |
1672 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1673 | continue; |
86872cb5 | 1674 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1675 | continue; |
3fa16561 M |
1676 | if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol) |
1677 | continue; | |
d8d1f30b | 1678 | dst_hold(&rt->dst); |
c71099ac | 1679 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1680 | |
86872cb5 | 1681 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1682 | } |
1683 | } | |
c71099ac | 1684 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1685 | |
1686 | return err; | |
1687 | } | |
1688 | ||
6700c270 | 1689 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 1690 | { |
e8599ff4 | 1691 | struct net *net = dev_net(skb->dev); |
a6279458 | 1692 | struct netevent_redirect netevent; |
e8599ff4 | 1693 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
1694 | struct ndisc_options ndopts; |
1695 | struct inet6_dev *in6_dev; | |
1696 | struct neighbour *neigh; | |
71bcdba0 | 1697 | struct rd_msg *msg; |
6e157b6a DM |
1698 | int optlen, on_link; |
1699 | u8 *lladdr; | |
e8599ff4 DM |
1700 | |
1701 | optlen = skb->tail - skb->transport_header; | |
71bcdba0 | 1702 | optlen -= sizeof(*msg); |
e8599ff4 DM |
1703 | |
1704 | if (optlen < 0) { | |
6e157b6a | 1705 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
1706 | return; |
1707 | } | |
1708 | ||
71bcdba0 | 1709 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 1710 | |
71bcdba0 | 1711 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 1712 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
1713 | return; |
1714 | } | |
1715 | ||
6e157b6a | 1716 | on_link = 0; |
71bcdba0 | 1717 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 1718 | on_link = 1; |
71bcdba0 | 1719 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 1720 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 1721 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
1722 | return; |
1723 | } | |
1724 | ||
1725 | in6_dev = __in6_dev_get(skb->dev); | |
1726 | if (!in6_dev) | |
1727 | return; | |
1728 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
1729 | return; | |
1730 | ||
1731 | /* RFC2461 8.1: | |
1732 | * The IP source address of the Redirect MUST be the same as the current | |
1733 | * first-hop router for the specified ICMP Destination Address. | |
1734 | */ | |
1735 | ||
71bcdba0 | 1736 | if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
1737 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
1738 | return; | |
1739 | } | |
6e157b6a DM |
1740 | |
1741 | lladdr = NULL; | |
e8599ff4 DM |
1742 | if (ndopts.nd_opts_tgt_lladdr) { |
1743 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1744 | skb->dev); | |
1745 | if (!lladdr) { | |
1746 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
1747 | return; | |
1748 | } | |
1749 | } | |
1750 | ||
6e157b6a DM |
1751 | rt = (struct rt6_info *) dst; |
1752 | if (rt == net->ipv6.ip6_null_entry) { | |
1753 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); | |
e8599ff4 | 1754 | return; |
6e157b6a | 1755 | } |
e8599ff4 | 1756 | |
6e157b6a DM |
1757 | /* Redirect received -> path was valid. |
1758 | * Look, redirects are sent only in response to data packets, | |
1759 | * so that this nexthop apparently is reachable. --ANK | |
1760 | */ | |
1761 | dst_confirm(&rt->dst); | |
a6279458 | 1762 | |
71bcdba0 | 1763 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
1764 | if (!neigh) |
1765 | return; | |
a6279458 | 1766 | |
1da177e4 LT |
1767 | /* |
1768 | * We have finally decided to accept it. | |
1769 | */ | |
1770 | ||
1ab1457c | 1771 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1772 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1773 | NEIGH_UPDATE_F_OVERRIDE| | |
1774 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1775 | NEIGH_UPDATE_F_ISROUTER)) | |
1776 | ); | |
1777 | ||
71bcdba0 | 1778 | nrt = ip6_rt_copy(rt, &msg->dest); |
38308473 | 1779 | if (!nrt) |
1da177e4 LT |
1780 | goto out; |
1781 | ||
1782 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1783 | if (on_link) | |
1784 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1785 | ||
4e3fd7a0 | 1786 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 1787 | |
40e22e8f | 1788 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1789 | goto out; |
1790 | ||
d8d1f30b CG |
1791 | netevent.old = &rt->dst; |
1792 | netevent.new = &nrt->dst; | |
71bcdba0 | 1793 | netevent.daddr = &msg->dest; |
60592833 | 1794 | netevent.neigh = neigh; |
8d71740c TT |
1795 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1796 | ||
38308473 | 1797 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 1798 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 1799 | ip6_del_rt(rt); |
1da177e4 LT |
1800 | } |
1801 | ||
1802 | out: | |
e8599ff4 | 1803 | neigh_release(neigh); |
6e157b6a DM |
1804 | } |
1805 | ||
1da177e4 LT |
1806 | /* |
1807 | * Misc support functions | |
1808 | */ | |
1809 | ||
1716a961 | 1810 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 1811 | const struct in6_addr *dest) |
1da177e4 | 1812 | { |
d1918542 | 1813 | struct net *net = dev_net(ort->dst.dev); |
8b96d22d DM |
1814 | struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0, |
1815 | ort->rt6i_table); | |
1da177e4 LT |
1816 | |
1817 | if (rt) { | |
d8d1f30b CG |
1818 | rt->dst.input = ort->dst.input; |
1819 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1820 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1821 | |
4e3fd7a0 | 1822 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1823 | rt->rt6i_dst.plen = 128; |
defb3519 | 1824 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1825 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1826 | rt->rt6i_idev = ort->rt6i_idev; |
1827 | if (rt->rt6i_idev) | |
1828 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1829 | rt->dst.lastuse = jiffies; |
1da177e4 | 1830 | |
044d6efb JA |
1831 | if (ort->rt6i_flags & RTF_GATEWAY) |
1832 | rt->rt6i_gateway = ort->rt6i_gateway; | |
1833 | else | |
1834 | rt->rt6i_gateway = *dest; | |
1716a961 | 1835 | rt->rt6i_flags = ort->rt6i_flags; |
717e66b3 | 1836 | rt6_set_from(rt, ort); |
1da177e4 LT |
1837 | rt->rt6i_metric = 0; |
1838 | ||
1da177e4 LT |
1839 | #ifdef CONFIG_IPV6_SUBTREES |
1840 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1841 | #endif | |
0f6c6392 | 1842 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1843 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1844 | } |
1845 | return rt; | |
1846 | } | |
1847 | ||
70ceb4f5 | 1848 | #ifdef CONFIG_IPV6_ROUTE_INFO |
6fa3eb70 | 1849 | static struct rt6_info *rt6_get_route_info(struct net_device *dev, |
b71d1d42 | 1850 | const struct in6_addr *prefix, int prefixlen, |
6fa3eb70 | 1851 | const struct in6_addr *gwaddr) |
70ceb4f5 YH |
1852 | { |
1853 | struct fib6_node *fn; | |
1854 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1855 | struct fib6_table *table; |
1856 | ||
6fa3eb70 S |
1857 | table = fib6_get_table(dev_net(dev), |
1858 | addrconf_rt_table(dev, RT6_TABLE_INFO)); | |
38308473 | 1859 | if (!table) |
c71099ac | 1860 | return NULL; |
70ceb4f5 | 1861 | |
5744dd9b | 1862 | read_lock_bh(&table->tb6_lock); |
c71099ac | 1863 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); |
70ceb4f5 YH |
1864 | if (!fn) |
1865 | goto out; | |
1866 | ||
d8d1f30b | 1867 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
6fa3eb70 | 1868 | if (rt->dst.dev->ifindex != dev->ifindex) |
70ceb4f5 YH |
1869 | continue; |
1870 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1871 | continue; | |
1872 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1873 | continue; | |
d8d1f30b | 1874 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1875 | break; |
1876 | } | |
1877 | out: | |
5744dd9b | 1878 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1879 | return rt; |
1880 | } | |
1881 | ||
6fa3eb70 | 1882 | static struct rt6_info *rt6_add_route_info(struct net_device *dev, |
b71d1d42 | 1883 | const struct in6_addr *prefix, int prefixlen, |
6fa3eb70 | 1884 | const struct in6_addr *gwaddr, unsigned int pref) |
70ceb4f5 | 1885 | { |
86872cb5 | 1886 | struct fib6_config cfg = { |
6fa3eb70 | 1887 | .fc_table = addrconf_rt_table(dev, RT6_TABLE_INFO), |
238fc7ea | 1888 | .fc_metric = IP6_RT_PRIO_USER, |
6fa3eb70 | 1889 | .fc_ifindex = dev->ifindex, |
86872cb5 TG |
1890 | .fc_dst_len = prefixlen, |
1891 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1892 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 1893 | .fc_nlinfo.portid = 0, |
efa2cea0 | 1894 | .fc_nlinfo.nlh = NULL, |
6fa3eb70 | 1895 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 TG |
1896 | }; |
1897 | ||
4e3fd7a0 AD |
1898 | cfg.fc_dst = *prefix; |
1899 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 1900 | |
e317da96 YH |
1901 | /* We should treat it as a default route if prefix length is 0. */ |
1902 | if (!prefixlen) | |
86872cb5 | 1903 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1904 | |
86872cb5 | 1905 | ip6_route_add(&cfg); |
70ceb4f5 | 1906 | |
6fa3eb70 | 1907 | return rt6_get_route_info(dev, prefix, prefixlen, gwaddr); |
70ceb4f5 YH |
1908 | } |
1909 | #endif | |
1910 | ||
b71d1d42 | 1911 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1912 | { |
1da177e4 | 1913 | struct rt6_info *rt; |
c71099ac | 1914 | struct fib6_table *table; |
1da177e4 | 1915 | |
6fa3eb70 S |
1916 | table = fib6_get_table(dev_net(dev), |
1917 | addrconf_rt_table(dev, RT6_TABLE_MAIN)); | |
38308473 | 1918 | if (!table) |
c71099ac | 1919 | return NULL; |
1da177e4 | 1920 | |
5744dd9b | 1921 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1922 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
d1918542 | 1923 | if (dev == rt->dst.dev && |
045927ff | 1924 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1925 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1926 | break; | |
1927 | } | |
1928 | if (rt) | |
d8d1f30b | 1929 | dst_hold(&rt->dst); |
5744dd9b | 1930 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1931 | return rt; |
1932 | } | |
1933 | ||
b71d1d42 | 1934 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
1935 | struct net_device *dev, |
1936 | unsigned int pref) | |
1da177e4 | 1937 | { |
86872cb5 | 1938 | struct fib6_config cfg = { |
6fa3eb70 | 1939 | .fc_table = addrconf_rt_table(dev, RT6_TABLE_DFLT), |
238fc7ea | 1940 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1941 | .fc_ifindex = dev->ifindex, |
1942 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1943 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 1944 | .fc_nlinfo.portid = 0, |
5578689a | 1945 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 1946 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1947 | }; |
1da177e4 | 1948 | |
4e3fd7a0 | 1949 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 1950 | |
86872cb5 | 1951 | ip6_route_add(&cfg); |
1da177e4 | 1952 | |
1da177e4 LT |
1953 | return rt6_get_dflt_router(gwaddr, dev); |
1954 | } | |
1955 | ||
c71099ac | 1956 | |
6fa3eb70 S |
1957 | int rt6_addrconf_purge(struct rt6_info *rt, void *arg) { |
1958 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && | |
1959 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) | |
1960 | return -1; | |
1961 | return 0; | |
1962 | } | |
1da177e4 | 1963 | |
6fa3eb70 S |
1964 | void rt6_purge_dflt_routers(struct net *net) |
1965 | { | |
1966 | fib6_clean_all(net, rt6_addrconf_purge, 0, NULL); | |
1da177e4 LT |
1967 | } |
1968 | ||
5578689a DL |
1969 | static void rtmsg_to_fib6_config(struct net *net, |
1970 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1971 | struct fib6_config *cfg) |
1972 | { | |
1973 | memset(cfg, 0, sizeof(*cfg)); | |
1974 | ||
1975 | cfg->fc_table = RT6_TABLE_MAIN; | |
1976 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1977 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1978 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1979 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1980 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1981 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1982 | ||
5578689a | 1983 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1984 | |
4e3fd7a0 AD |
1985 | cfg->fc_dst = rtmsg->rtmsg_dst; |
1986 | cfg->fc_src = rtmsg->rtmsg_src; | |
1987 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
1988 | } |
1989 | ||
5578689a | 1990 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1991 | { |
86872cb5 | 1992 | struct fib6_config cfg; |
1da177e4 LT |
1993 | struct in6_rtmsg rtmsg; |
1994 | int err; | |
1995 | ||
1996 | switch(cmd) { | |
1997 | case SIOCADDRT: /* Add a route */ | |
1998 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 1999 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2000 | return -EPERM; |
2001 | err = copy_from_user(&rtmsg, arg, | |
2002 | sizeof(struct in6_rtmsg)); | |
2003 | if (err) | |
2004 | return -EFAULT; | |
86872cb5 | 2005 | |
5578689a | 2006 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2007 | |
1da177e4 LT |
2008 | rtnl_lock(); |
2009 | switch (cmd) { | |
2010 | case SIOCADDRT: | |
86872cb5 | 2011 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2012 | break; |
2013 | case SIOCDELRT: | |
86872cb5 | 2014 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2015 | break; |
2016 | default: | |
2017 | err = -EINVAL; | |
2018 | } | |
2019 | rtnl_unlock(); | |
2020 | ||
2021 | return err; | |
3ff50b79 | 2022 | } |
1da177e4 LT |
2023 | |
2024 | return -EINVAL; | |
2025 | } | |
2026 | ||
2027 | /* | |
2028 | * Drop the packet on the floor | |
2029 | */ | |
2030 | ||
d5fdd6ba | 2031 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2032 | { |
612f09e8 | 2033 | int type; |
adf30907 | 2034 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2035 | switch (ipstats_mib_noroutes) { |
2036 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2037 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2038 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2039 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2040 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2041 | break; |
2042 | } | |
2043 | /* FALLTHROUGH */ | |
2044 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2045 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2046 | ipstats_mib_noroutes); | |
612f09e8 YH |
2047 | break; |
2048 | } | |
3ffe533c | 2049 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2050 | kfree_skb(skb); |
2051 | return 0; | |
2052 | } | |
2053 | ||
9ce8ade0 TG |
2054 | static int ip6_pkt_discard(struct sk_buff *skb) |
2055 | { | |
612f09e8 | 2056 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2057 | } |
2058 | ||
20380731 | 2059 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 2060 | { |
adf30907 | 2061 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2062 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2063 | } |
2064 | ||
9ce8ade0 TG |
2065 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2066 | { | |
612f09e8 | 2067 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2068 | } |
2069 | ||
2070 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
2071 | { | |
adf30907 | 2072 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2073 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2074 | } |
2075 | ||
1da177e4 LT |
2076 | /* |
2077 | * Allocate a dst for local (unicast / anycast) address. | |
2078 | */ | |
2079 | ||
2080 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2081 | const struct in6_addr *addr, | |
8f031519 | 2082 | bool anycast) |
1da177e4 | 2083 | { |
c346dca1 | 2084 | struct net *net = dev_net(idev->dev); |
e28c2d64 HFS |
2085 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, |
2086 | DST_NOCOUNT, NULL); | |
2087 | if (!rt) | |
1da177e4 LT |
2088 | return ERR_PTR(-ENOMEM); |
2089 | ||
1da177e4 LT |
2090 | in6_dev_hold(idev); |
2091 | ||
11d53b49 | 2092 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2093 | rt->dst.input = ip6_input; |
2094 | rt->dst.output = ip6_output; | |
1da177e4 | 2095 | rt->rt6i_idev = idev; |
1da177e4 LT |
2096 | |
2097 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2098 | if (anycast) |
2099 | rt->rt6i_flags |= RTF_ANYCAST; | |
2100 | else | |
1da177e4 | 2101 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2102 | |
044d6efb | 2103 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 2104 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2105 | rt->rt6i_dst.plen = 128; |
5578689a | 2106 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2107 | |
d8d1f30b | 2108 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2109 | |
2110 | return rt; | |
2111 | } | |
2112 | ||
c3968a85 DW |
2113 | int ip6_route_get_saddr(struct net *net, |
2114 | struct rt6_info *rt, | |
b71d1d42 | 2115 | const struct in6_addr *daddr, |
c3968a85 DW |
2116 | unsigned int prefs, |
2117 | struct in6_addr *saddr) | |
2118 | { | |
2119 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2120 | int err = 0; | |
2121 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2122 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2123 | else |
2124 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2125 | daddr, prefs, saddr); | |
2126 | return err; | |
2127 | } | |
2128 | ||
2129 | /* remove deleted ip from prefsrc entries */ | |
2130 | struct arg_dev_net_ip { | |
2131 | struct net_device *dev; | |
2132 | struct net *net; | |
2133 | struct in6_addr *addr; | |
2134 | }; | |
2135 | ||
2136 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2137 | { | |
2138 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2139 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2140 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2141 | ||
d1918542 | 2142 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2143 | rt != net->ipv6.ip6_null_entry && |
2144 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2145 | /* remove prefsrc entry */ | |
2146 | rt->rt6i_prefsrc.plen = 0; | |
2147 | } | |
2148 | return 0; | |
2149 | } | |
2150 | ||
2151 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2152 | { | |
2153 | struct net *net = dev_net(ifp->idev->dev); | |
2154 | struct arg_dev_net_ip adni = { | |
2155 | .dev = ifp->idev->dev, | |
2156 | .net = net, | |
2157 | .addr = &ifp->addr, | |
2158 | }; | |
2159 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); | |
2160 | } | |
2161 | ||
8ed67789 DL |
2162 | struct arg_dev_net { |
2163 | struct net_device *dev; | |
2164 | struct net *net; | |
2165 | }; | |
2166 | ||
1da177e4 LT |
2167 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2168 | { | |
bc3ef660 | 2169 | const struct arg_dev_net *adn = arg; |
2170 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2171 | |
d1918542 | 2172 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2173 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2174 | return -1; |
c159d30c | 2175 | |
1da177e4 LT |
2176 | return 0; |
2177 | } | |
2178 | ||
f3db4851 | 2179 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2180 | { |
8ed67789 DL |
2181 | struct arg_dev_net adn = { |
2182 | .dev = dev, | |
2183 | .net = net, | |
2184 | }; | |
2185 | ||
2186 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2187 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2188 | } |
2189 | ||
95c96174 | 2190 | struct rt6_mtu_change_arg { |
1da177e4 | 2191 | struct net_device *dev; |
95c96174 | 2192 | unsigned int mtu; |
1da177e4 LT |
2193 | }; |
2194 | ||
2195 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2196 | { | |
2197 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2198 | struct inet6_dev *idev; | |
2199 | ||
2200 | /* In IPv6 pmtu discovery is not optional, | |
2201 | so that RTAX_MTU lock cannot disable it. | |
2202 | We still use this lock to block changes | |
2203 | caused by addrconf/ndisc. | |
2204 | */ | |
2205 | ||
2206 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2207 | if (!idev) |
1da177e4 LT |
2208 | return 0; |
2209 | ||
2210 | /* For administrative MTU increase, there is no way to discover | |
2211 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2212 | Since RFC 1981 doesn't include administrative MTU increase | |
2213 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2214 | */ | |
2215 | /* | |
2216 | If new MTU is less than route PMTU, this new MTU will be the | |
2217 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2218 | decreases; if new MTU is greater than route PMTU, and the | |
2219 | old MTU is the lowest MTU in the path, update the route PMTU | |
2220 | to reflect the increase. In this case if the other nodes' MTU | |
2221 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2222 | PMTU discouvery. | |
2223 | */ | |
d1918542 | 2224 | if (rt->dst.dev == arg->dev && |
d8d1f30b CG |
2225 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2226 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2227 | (dst_mtu(&rt->dst) < arg->mtu && | |
2228 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2229 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2230 | } |
1da177e4 LT |
2231 | return 0; |
2232 | } | |
2233 | ||
95c96174 | 2234 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2235 | { |
c71099ac TG |
2236 | struct rt6_mtu_change_arg arg = { |
2237 | .dev = dev, | |
2238 | .mtu = mtu, | |
2239 | }; | |
1da177e4 | 2240 | |
c346dca1 | 2241 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2242 | } |
2243 | ||
ef7c79ed | 2244 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2245 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2246 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2247 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2248 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2249 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2250 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
6fa3eb70 | 2251 | [RTA_UID] = { .type = NLA_U32 }, |
86872cb5 TG |
2252 | }; |
2253 | ||
2254 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2255 | struct fib6_config *cfg) | |
1da177e4 | 2256 | { |
86872cb5 TG |
2257 | struct rtmsg *rtm; |
2258 | struct nlattr *tb[RTA_MAX+1]; | |
2259 | int err; | |
1da177e4 | 2260 | |
86872cb5 TG |
2261 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2262 | if (err < 0) | |
2263 | goto errout; | |
1da177e4 | 2264 | |
86872cb5 TG |
2265 | err = -EINVAL; |
2266 | rtm = nlmsg_data(nlh); | |
2267 | memset(cfg, 0, sizeof(*cfg)); | |
2268 | ||
2269 | cfg->fc_table = rtm->rtm_table; | |
2270 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2271 | cfg->fc_src_len = rtm->rtm_src_len; | |
2272 | cfg->fc_flags = RTF_UP; | |
2273 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2274 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2275 | |
ef2c7d7b ND |
2276 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2277 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2278 | rtm->rtm_type == RTN_PROHIBIT || |
2279 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2280 | cfg->fc_flags |= RTF_REJECT; |
2281 | ||
ab79ad14 MŻ |
2282 | if (rtm->rtm_type == RTN_LOCAL) |
2283 | cfg->fc_flags |= RTF_LOCAL; | |
2284 | ||
15e47304 | 2285 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2286 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2287 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2288 | |
2289 | if (tb[RTA_GATEWAY]) { | |
2290 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2291 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2292 | } |
86872cb5 TG |
2293 | |
2294 | if (tb[RTA_DST]) { | |
2295 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2296 | ||
2297 | if (nla_len(tb[RTA_DST]) < plen) | |
2298 | goto errout; | |
2299 | ||
2300 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2301 | } |
86872cb5 TG |
2302 | |
2303 | if (tb[RTA_SRC]) { | |
2304 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2305 | ||
2306 | if (nla_len(tb[RTA_SRC]) < plen) | |
2307 | goto errout; | |
2308 | ||
2309 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2310 | } |
86872cb5 | 2311 | |
c3968a85 DW |
2312 | if (tb[RTA_PREFSRC]) |
2313 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2314 | ||
86872cb5 TG |
2315 | if (tb[RTA_OIF]) |
2316 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2317 | ||
2318 | if (tb[RTA_PRIORITY]) | |
2319 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2320 | ||
2321 | if (tb[RTA_METRICS]) { | |
2322 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2323 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2324 | } |
86872cb5 TG |
2325 | |
2326 | if (tb[RTA_TABLE]) | |
2327 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2328 | ||
51ebd318 ND |
2329 | if (tb[RTA_MULTIPATH]) { |
2330 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2331 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
2332 | } | |
2333 | ||
86872cb5 TG |
2334 | err = 0; |
2335 | errout: | |
2336 | return err; | |
1da177e4 LT |
2337 | } |
2338 | ||
51ebd318 ND |
2339 | static int ip6_route_multipath(struct fib6_config *cfg, int add) |
2340 | { | |
2341 | struct fib6_config r_cfg; | |
2342 | struct rtnexthop *rtnh; | |
2343 | int remaining; | |
2344 | int attrlen; | |
2345 | int err = 0, last_err = 0; | |
2346 | ||
2347 | beginning: | |
2348 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
2349 | remaining = cfg->fc_mp_len; | |
2350 | ||
2351 | /* Parse a Multipath Entry */ | |
2352 | while (rtnh_ok(rtnh, remaining)) { | |
2353 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2354 | if (rtnh->rtnh_ifindex) | |
2355 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2356 | ||
2357 | attrlen = rtnh_attrlen(rtnh); | |
2358 | if (attrlen > 0) { | |
2359 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2360 | ||
2361 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2362 | if (nla) { | |
2363 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
2364 | r_cfg.fc_flags |= RTF_GATEWAY; | |
2365 | } | |
2366 | } | |
2367 | err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg); | |
2368 | if (err) { | |
2369 | last_err = err; | |
2370 | /* If we are trying to remove a route, do not stop the | |
2371 | * loop when ip6_route_del() fails (because next hop is | |
2372 | * already gone), we should try to remove all next hops. | |
2373 | */ | |
2374 | if (add) { | |
2375 | /* If add fails, we should try to delete all | |
2376 | * next hops that have been already added. | |
2377 | */ | |
2378 | add = 0; | |
2379 | goto beginning; | |
2380 | } | |
2381 | } | |
1a72418b ND |
2382 | /* Because each route is added like a single route we remove |
2383 | * this flag after the first nexthop (if there is a collision, | |
2384 | * we have already fail to add the first nexthop: | |
2385 | * fib6_add_rt2node() has reject it). | |
2386 | */ | |
2387 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL; | |
51ebd318 ND |
2388 | rtnh = rtnh_next(rtnh, &remaining); |
2389 | } | |
2390 | ||
2391 | return last_err; | |
2392 | } | |
2393 | ||
661d2967 | 2394 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh) |
1da177e4 | 2395 | { |
86872cb5 TG |
2396 | struct fib6_config cfg; |
2397 | int err; | |
1da177e4 | 2398 | |
86872cb5 TG |
2399 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2400 | if (err < 0) | |
2401 | return err; | |
2402 | ||
51ebd318 ND |
2403 | if (cfg.fc_mp) |
2404 | return ip6_route_multipath(&cfg, 0); | |
2405 | else | |
2406 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2407 | } |
2408 | ||
661d2967 | 2409 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh) |
1da177e4 | 2410 | { |
86872cb5 TG |
2411 | struct fib6_config cfg; |
2412 | int err; | |
1da177e4 | 2413 | |
86872cb5 TG |
2414 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2415 | if (err < 0) | |
2416 | return err; | |
2417 | ||
51ebd318 ND |
2418 | if (cfg.fc_mp) |
2419 | return ip6_route_multipath(&cfg, 1); | |
2420 | else | |
2421 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2422 | } |
2423 | ||
339bf98f TG |
2424 | static inline size_t rt6_nlmsg_size(void) |
2425 | { | |
2426 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2427 | + nla_total_size(16) /* RTA_SRC */ | |
2428 | + nla_total_size(16) /* RTA_DST */ | |
2429 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2430 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2431 | + nla_total_size(4) /* RTA_TABLE */ | |
2432 | + nla_total_size(4) /* RTA_IIF */ | |
2433 | + nla_total_size(4) /* RTA_OIF */ | |
2434 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2435 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2436 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2437 | } | |
2438 | ||
191cd582 BH |
2439 | static int rt6_fill_node(struct net *net, |
2440 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 2441 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 2442 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 2443 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2444 | { |
2445 | struct rtmsg *rtm; | |
2d7202bf | 2446 | struct nlmsghdr *nlh; |
e3703b3d | 2447 | long expires; |
9e762a4a | 2448 | u32 table; |
1da177e4 LT |
2449 | |
2450 | if (prefix) { /* user wants prefix routes only */ | |
2451 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2452 | /* success since this is not a prefix route */ | |
2453 | return 1; | |
2454 | } | |
2455 | } | |
2456 | ||
15e47304 | 2457 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 2458 | if (!nlh) |
26932566 | 2459 | return -EMSGSIZE; |
2d7202bf TG |
2460 | |
2461 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2462 | rtm->rtm_family = AF_INET6; |
2463 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2464 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2465 | rtm->rtm_tos = 0; | |
c71099ac | 2466 | if (rt->rt6i_table) |
9e762a4a | 2467 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2468 | else |
9e762a4a PM |
2469 | table = RT6_TABLE_UNSPEC; |
2470 | rtm->rtm_table = table; | |
c78679e8 DM |
2471 | if (nla_put_u32(skb, RTA_TABLE, table)) |
2472 | goto nla_put_failure; | |
ef2c7d7b ND |
2473 | if (rt->rt6i_flags & RTF_REJECT) { |
2474 | switch (rt->dst.error) { | |
2475 | case -EINVAL: | |
2476 | rtm->rtm_type = RTN_BLACKHOLE; | |
2477 | break; | |
2478 | case -EACCES: | |
2479 | rtm->rtm_type = RTN_PROHIBIT; | |
2480 | break; | |
b4949ab2 ND |
2481 | case -EAGAIN: |
2482 | rtm->rtm_type = RTN_THROW; | |
2483 | break; | |
ef2c7d7b ND |
2484 | default: |
2485 | rtm->rtm_type = RTN_UNREACHABLE; | |
2486 | break; | |
2487 | } | |
2488 | } | |
38308473 | 2489 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2490 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2491 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2492 | rtm->rtm_type = RTN_LOCAL; |
2493 | else | |
2494 | rtm->rtm_type = RTN_UNICAST; | |
2495 | rtm->rtm_flags = 0; | |
2496 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2497 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2498 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 2499 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
2500 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
2501 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
2502 | rtm->rtm_protocol = RTPROT_RA; | |
2503 | else | |
2504 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2505 | } | |
1da177e4 | 2506 | |
38308473 | 2507 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2508 | rtm->rtm_flags |= RTM_F_CLONED; |
2509 | ||
2510 | if (dst) { | |
c78679e8 DM |
2511 | if (nla_put(skb, RTA_DST, 16, dst)) |
2512 | goto nla_put_failure; | |
1ab1457c | 2513 | rtm->rtm_dst_len = 128; |
1da177e4 | 2514 | } else if (rtm->rtm_dst_len) |
c78679e8 DM |
2515 | if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) |
2516 | goto nla_put_failure; | |
1da177e4 LT |
2517 | #ifdef CONFIG_IPV6_SUBTREES |
2518 | if (src) { | |
c78679e8 DM |
2519 | if (nla_put(skb, RTA_SRC, 16, src)) |
2520 | goto nla_put_failure; | |
1ab1457c | 2521 | rtm->rtm_src_len = 128; |
c78679e8 DM |
2522 | } else if (rtm->rtm_src_len && |
2523 | nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) | |
2524 | goto nla_put_failure; | |
1da177e4 | 2525 | #endif |
7bc570c8 YH |
2526 | if (iif) { |
2527 | #ifdef CONFIG_IPV6_MROUTE | |
2528 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
2943dca4 NA |
2529 | int err = ip6mr_get_route(net, skb, rtm, nowait, |
2530 | portid); | |
2531 | ||
7bc570c8 YH |
2532 | if (err <= 0) { |
2533 | if (!nowait) { | |
2534 | if (err == 0) | |
2535 | return 0; | |
2536 | goto nla_put_failure; | |
2537 | } else { | |
2538 | if (err == -EMSGSIZE) | |
2539 | goto nla_put_failure; | |
2540 | } | |
2541 | } | |
2542 | } else | |
2543 | #endif | |
c78679e8 DM |
2544 | if (nla_put_u32(skb, RTA_IIF, iif)) |
2545 | goto nla_put_failure; | |
7bc570c8 | 2546 | } else if (dst) { |
1da177e4 | 2547 | struct in6_addr saddr_buf; |
c78679e8 DM |
2548 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
2549 | nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) | |
2550 | goto nla_put_failure; | |
1da177e4 | 2551 | } |
2d7202bf | 2552 | |
c3968a85 DW |
2553 | if (rt->rt6i_prefsrc.plen) { |
2554 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2555 | saddr_buf = rt->rt6i_prefsrc.addr; |
c78679e8 DM |
2556 | if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
2557 | goto nla_put_failure; | |
c3968a85 DW |
2558 | } |
2559 | ||
defb3519 | 2560 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2561 | goto nla_put_failure; |
2562 | ||
dd0cbf29 YH |
2563 | if (rt->rt6i_flags & RTF_GATEWAY) { |
2564 | if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0) | |
94f826b8 | 2565 | goto nla_put_failure; |
94f826b8 | 2566 | } |
2d7202bf | 2567 | |
c78679e8 DM |
2568 | if (rt->dst.dev && |
2569 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2570 | goto nla_put_failure; | |
2571 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
2572 | goto nla_put_failure; | |
8253947e LW |
2573 | |
2574 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 2575 | |
87a50699 | 2576 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 2577 | goto nla_put_failure; |
2d7202bf TG |
2578 | |
2579 | return nlmsg_end(skb, nlh); | |
2580 | ||
2581 | nla_put_failure: | |
26932566 PM |
2582 | nlmsg_cancel(skb, nlh); |
2583 | return -EMSGSIZE; | |
1da177e4 LT |
2584 | } |
2585 | ||
1b43af54 | 2586 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2587 | { |
2588 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2589 | int prefix; | |
2590 | ||
2d7202bf TG |
2591 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2592 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2593 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2594 | } else | |
2595 | prefix = 0; | |
2596 | ||
191cd582 BH |
2597 | return rt6_fill_node(arg->net, |
2598 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 2599 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2600 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2601 | } |
2602 | ||
661d2967 | 2603 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh) |
1da177e4 | 2604 | { |
3b1e0a65 | 2605 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2606 | struct nlattr *tb[RTA_MAX+1]; |
2607 | struct rt6_info *rt; | |
1da177e4 | 2608 | struct sk_buff *skb; |
ab364a6f | 2609 | struct rtmsg *rtm; |
4c9483b2 | 2610 | struct flowi6 fl6; |
72331bc0 | 2611 | int err, iif = 0, oif = 0; |
1da177e4 | 2612 | |
ab364a6f TG |
2613 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2614 | if (err < 0) | |
2615 | goto errout; | |
1da177e4 | 2616 | |
ab364a6f | 2617 | err = -EINVAL; |
4c9483b2 | 2618 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2619 | |
ab364a6f TG |
2620 | if (tb[RTA_SRC]) { |
2621 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2622 | goto errout; | |
2623 | ||
4e3fd7a0 | 2624 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2625 | } |
2626 | ||
2627 | if (tb[RTA_DST]) { | |
2628 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2629 | goto errout; | |
2630 | ||
4e3fd7a0 | 2631 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2632 | } |
2633 | ||
2634 | if (tb[RTA_IIF]) | |
2635 | iif = nla_get_u32(tb[RTA_IIF]); | |
2636 | ||
2637 | if (tb[RTA_OIF]) | |
72331bc0 | 2638 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 2639 | |
6fa3eb70 S |
2640 | if (tb[RTA_UID]) |
2641 | fl6.flowi6_uid = make_kuid(current_user_ns(), | |
2642 | nla_get_u32(tb[RTA_UID])); | |
2643 | else | |
2644 | fl6.flowi6_uid = iif ? INVALID_UID : current_uid(); | |
2645 | ||
1da177e4 LT |
2646 | if (iif) { |
2647 | struct net_device *dev; | |
72331bc0 SL |
2648 | int flags = 0; |
2649 | ||
5578689a | 2650 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2651 | if (!dev) { |
2652 | err = -ENODEV; | |
ab364a6f | 2653 | goto errout; |
1da177e4 | 2654 | } |
72331bc0 SL |
2655 | |
2656 | fl6.flowi6_iif = iif; | |
2657 | ||
2658 | if (!ipv6_addr_any(&fl6.saddr)) | |
2659 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2660 | ||
2661 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
2662 | flags); | |
2663 | } else { | |
2664 | fl6.flowi6_oif = oif; | |
2665 | ||
2666 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
2667 | } |
2668 | ||
ab364a6f | 2669 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2670 | if (!skb) { |
94e187c0 | 2671 | ip6_rt_put(rt); |
ab364a6f TG |
2672 | err = -ENOBUFS; |
2673 | goto errout; | |
2674 | } | |
1da177e4 | 2675 | |
ab364a6f TG |
2676 | /* Reserve room for dummy headers, this skb can pass |
2677 | through good chunk of routing engine. | |
2678 | */ | |
459a98ed | 2679 | skb_reset_mac_header(skb); |
ab364a6f | 2680 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2681 | |
d8d1f30b | 2682 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2683 | |
4c9483b2 | 2684 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 2685 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 2686 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2687 | if (err < 0) { |
ab364a6f TG |
2688 | kfree_skb(skb); |
2689 | goto errout; | |
1da177e4 LT |
2690 | } |
2691 | ||
15e47304 | 2692 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 2693 | errout: |
1da177e4 | 2694 | return err; |
1da177e4 LT |
2695 | } |
2696 | ||
86872cb5 | 2697 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2698 | { |
2699 | struct sk_buff *skb; | |
5578689a | 2700 | struct net *net = info->nl_net; |
528c4ceb DL |
2701 | u32 seq; |
2702 | int err; | |
2703 | ||
2704 | err = -ENOBUFS; | |
38308473 | 2705 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2706 | |
339bf98f | 2707 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2708 | if (!skb) |
21713ebc TG |
2709 | goto errout; |
2710 | ||
191cd582 | 2711 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
15e47304 | 2712 | event, info->portid, seq, 0, 0, 0); |
26932566 PM |
2713 | if (err < 0) { |
2714 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2715 | WARN_ON(err == -EMSGSIZE); | |
2716 | kfree_skb(skb); | |
2717 | goto errout; | |
2718 | } | |
15e47304 | 2719 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
2720 | info->nlh, gfp_any()); |
2721 | return; | |
21713ebc TG |
2722 | errout: |
2723 | if (err < 0) | |
5578689a | 2724 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2725 | } |
2726 | ||
8ed67789 DL |
2727 | static int ip6_route_dev_notify(struct notifier_block *this, |
2728 | unsigned long event, void *data) | |
2729 | { | |
2730 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2731 | struct net *net = dev_net(dev); |
8ed67789 DL |
2732 | |
2733 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2734 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2735 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2736 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2737 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2738 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2739 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2740 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2741 | #endif | |
2742 | } | |
2743 | ||
2744 | return NOTIFY_OK; | |
2745 | } | |
2746 | ||
1da177e4 LT |
2747 | /* |
2748 | * /proc | |
2749 | */ | |
2750 | ||
2751 | #ifdef CONFIG_PROC_FS | |
2752 | ||
1da177e4 LT |
2753 | struct rt6_proc_arg |
2754 | { | |
2755 | char *buffer; | |
2756 | int offset; | |
2757 | int length; | |
2758 | int skip; | |
2759 | int len; | |
2760 | }; | |
2761 | ||
2762 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2763 | { | |
33120b30 | 2764 | struct seq_file *m = p_arg; |
1da177e4 | 2765 | |
4b7a4274 | 2766 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2767 | |
2768 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2769 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2770 | #else |
33120b30 | 2771 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 | 2772 | #endif |
dd0cbf29 YH |
2773 | if (rt->rt6i_flags & RTF_GATEWAY) { |
2774 | seq_printf(m, "%pi6", &rt->rt6i_gateway); | |
1da177e4 | 2775 | } else { |
33120b30 | 2776 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2777 | } |
33120b30 | 2778 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2779 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2780 | rt->dst.__use, rt->rt6i_flags, | |
d1918542 | 2781 | rt->dst.dev ? rt->dst.dev->name : ""); |
1da177e4 LT |
2782 | return 0; |
2783 | } | |
2784 | ||
33120b30 | 2785 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2786 | { |
f3db4851 | 2787 | struct net *net = (struct net *)m->private; |
32b293a5 | 2788 | fib6_clean_all_ro(net, rt6_info_route, 0, m); |
33120b30 AD |
2789 | return 0; |
2790 | } | |
1da177e4 | 2791 | |
33120b30 AD |
2792 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2793 | { | |
de05c557 | 2794 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2795 | } |
2796 | ||
33120b30 AD |
2797 | static const struct file_operations ipv6_route_proc_fops = { |
2798 | .owner = THIS_MODULE, | |
2799 | .open = ipv6_route_open, | |
2800 | .read = seq_read, | |
2801 | .llseek = seq_lseek, | |
b6fcbdb4 | 2802 | .release = single_release_net, |
33120b30 AD |
2803 | }; |
2804 | ||
1da177e4 LT |
2805 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2806 | { | |
69ddb805 | 2807 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2808 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2809 | net->ipv6.rt6_stats->fib_nodes, |
2810 | net->ipv6.rt6_stats->fib_route_nodes, | |
2811 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2812 | net->ipv6.rt6_stats->fib_rt_entries, | |
2813 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2814 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2815 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2816 | |
2817 | return 0; | |
2818 | } | |
2819 | ||
2820 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2821 | { | |
de05c557 | 2822 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2823 | } |
2824 | ||
9a32144e | 2825 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2826 | .owner = THIS_MODULE, |
2827 | .open = rt6_stats_seq_open, | |
2828 | .read = seq_read, | |
2829 | .llseek = seq_lseek, | |
b6fcbdb4 | 2830 | .release = single_release_net, |
1da177e4 LT |
2831 | }; |
2832 | #endif /* CONFIG_PROC_FS */ | |
2833 | ||
2834 | #ifdef CONFIG_SYSCTL | |
2835 | ||
1da177e4 | 2836 | static |
8d65af78 | 2837 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2838 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2839 | { | |
c486da34 LAG |
2840 | struct net *net; |
2841 | int delay; | |
2842 | if (!write) | |
1da177e4 | 2843 | return -EINVAL; |
c486da34 LAG |
2844 | |
2845 | net = (struct net *)ctl->extra1; | |
2846 | delay = net->ipv6.sysctl.flush_delay; | |
2847 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
ba310bc8 | 2848 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 2849 | return 0; |
1da177e4 LT |
2850 | } |
2851 | ||
760f2d01 | 2852 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2853 | { |
1da177e4 | 2854 | .procname = "flush", |
4990509f | 2855 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2856 | .maxlen = sizeof(int), |
89c8b3a1 | 2857 | .mode = 0200, |
6d9f239a | 2858 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2859 | }, |
2860 | { | |
1da177e4 | 2861 | .procname = "gc_thresh", |
9a7ec3a9 | 2862 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2863 | .maxlen = sizeof(int), |
2864 | .mode = 0644, | |
6d9f239a | 2865 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2866 | }, |
2867 | { | |
1da177e4 | 2868 | .procname = "max_size", |
4990509f | 2869 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2870 | .maxlen = sizeof(int), |
2871 | .mode = 0644, | |
6d9f239a | 2872 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2873 | }, |
2874 | { | |
1da177e4 | 2875 | .procname = "gc_min_interval", |
4990509f | 2876 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2877 | .maxlen = sizeof(int), |
2878 | .mode = 0644, | |
6d9f239a | 2879 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2880 | }, |
2881 | { | |
1da177e4 | 2882 | .procname = "gc_timeout", |
4990509f | 2883 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2884 | .maxlen = sizeof(int), |
2885 | .mode = 0644, | |
6d9f239a | 2886 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2887 | }, |
2888 | { | |
1da177e4 | 2889 | .procname = "gc_interval", |
4990509f | 2890 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2891 | .maxlen = sizeof(int), |
2892 | .mode = 0644, | |
6d9f239a | 2893 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2894 | }, |
2895 | { | |
1da177e4 | 2896 | .procname = "gc_elasticity", |
4990509f | 2897 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2898 | .maxlen = sizeof(int), |
2899 | .mode = 0644, | |
f3d3f616 | 2900 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2901 | }, |
2902 | { | |
1da177e4 | 2903 | .procname = "mtu_expires", |
4990509f | 2904 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2905 | .maxlen = sizeof(int), |
2906 | .mode = 0644, | |
6d9f239a | 2907 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2908 | }, |
2909 | { | |
1da177e4 | 2910 | .procname = "min_adv_mss", |
4990509f | 2911 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2912 | .maxlen = sizeof(int), |
2913 | .mode = 0644, | |
f3d3f616 | 2914 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2915 | }, |
2916 | { | |
1da177e4 | 2917 | .procname = "gc_min_interval_ms", |
4990509f | 2918 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2919 | .maxlen = sizeof(int), |
2920 | .mode = 0644, | |
6d9f239a | 2921 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2922 | }, |
f8572d8f | 2923 | { } |
1da177e4 LT |
2924 | }; |
2925 | ||
2c8c1e72 | 2926 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2927 | { |
2928 | struct ctl_table *table; | |
2929 | ||
2930 | table = kmemdup(ipv6_route_table_template, | |
2931 | sizeof(ipv6_route_table_template), | |
2932 | GFP_KERNEL); | |
5ee09105 YH |
2933 | |
2934 | if (table) { | |
2935 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2936 | table[0].extra1 = net; |
86393e52 | 2937 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2938 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2939 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2940 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2941 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2942 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2943 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2944 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2945 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
2946 | |
2947 | /* Don't export sysctls to unprivileged users */ | |
2948 | if (net->user_ns != &init_user_ns) | |
2949 | table[0].procname = NULL; | |
5ee09105 YH |
2950 | } |
2951 | ||
760f2d01 DL |
2952 | return table; |
2953 | } | |
1da177e4 LT |
2954 | #endif |
2955 | ||
2c8c1e72 | 2956 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2957 | { |
633d424b | 2958 | int ret = -ENOMEM; |
8ed67789 | 2959 | |
86393e52 AD |
2960 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2961 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2962 | |
fc66f95c ED |
2963 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2964 | goto out_ip6_dst_ops; | |
2965 | ||
8ed67789 DL |
2966 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2967 | sizeof(*net->ipv6.ip6_null_entry), | |
2968 | GFP_KERNEL); | |
2969 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2970 | goto out_ip6_dst_entries; |
d8d1f30b | 2971 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2972 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2973 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2974 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
2975 | ip6_template_metrics, true); | |
8ed67789 DL |
2976 | |
2977 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2978 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2979 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2980 | GFP_KERNEL); | |
68fffc67 PZ |
2981 | if (!net->ipv6.ip6_prohibit_entry) |
2982 | goto out_ip6_null_entry; | |
d8d1f30b | 2983 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2984 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2985 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2986 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
2987 | ip6_template_metrics, true); | |
8ed67789 DL |
2988 | |
2989 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2990 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2991 | GFP_KERNEL); | |
68fffc67 PZ |
2992 | if (!net->ipv6.ip6_blk_hole_entry) |
2993 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2994 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2995 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2996 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2997 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
2998 | ip6_template_metrics, true); | |
8ed67789 DL |
2999 | #endif |
3000 | ||
b339a47c PZ |
3001 | net->ipv6.sysctl.flush_delay = 0; |
3002 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3003 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3004 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3005 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3006 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
3007 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
3008 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
3009 | ||
6891a346 BT |
3010 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
3011 | ||
8ed67789 DL |
3012 | ret = 0; |
3013 | out: | |
3014 | return ret; | |
f2fc6a54 | 3015 | |
68fffc67 PZ |
3016 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
3017 | out_ip6_prohibit_entry: | |
3018 | kfree(net->ipv6.ip6_prohibit_entry); | |
3019 | out_ip6_null_entry: | |
3020 | kfree(net->ipv6.ip6_null_entry); | |
3021 | #endif | |
fc66f95c ED |
3022 | out_ip6_dst_entries: |
3023 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3024 | out_ip6_dst_ops: |
f2fc6a54 | 3025 | goto out; |
cdb18761 DL |
3026 | } |
3027 | ||
2c8c1e72 | 3028 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3029 | { |
8ed67789 DL |
3030 | kfree(net->ipv6.ip6_null_entry); |
3031 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3032 | kfree(net->ipv6.ip6_prohibit_entry); | |
3033 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3034 | #endif | |
41bb78b4 | 3035 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3036 | } |
3037 | ||
d189634e TG |
3038 | static int __net_init ip6_route_net_init_late(struct net *net) |
3039 | { | |
3040 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
3041 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
3042 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3043 | #endif |
3044 | return 0; | |
3045 | } | |
3046 | ||
3047 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3048 | { | |
3049 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3050 | remove_proc_entry("ipv6_route", net->proc_net); |
3051 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3052 | #endif |
3053 | } | |
3054 | ||
cdb18761 DL |
3055 | static struct pernet_operations ip6_route_net_ops = { |
3056 | .init = ip6_route_net_init, | |
3057 | .exit = ip6_route_net_exit, | |
3058 | }; | |
3059 | ||
c3426b47 DM |
3060 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3061 | { | |
3062 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3063 | ||
3064 | if (!bp) | |
3065 | return -ENOMEM; | |
3066 | inet_peer_base_init(bp); | |
3067 | net->ipv6.peers = bp; | |
3068 | return 0; | |
3069 | } | |
3070 | ||
3071 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3072 | { | |
3073 | struct inet_peer_base *bp = net->ipv6.peers; | |
3074 | ||
3075 | net->ipv6.peers = NULL; | |
56a6b248 | 3076 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3077 | kfree(bp); |
3078 | } | |
3079 | ||
2b823f72 | 3080 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3081 | .init = ipv6_inetpeer_init, |
3082 | .exit = ipv6_inetpeer_exit, | |
3083 | }; | |
3084 | ||
d189634e TG |
3085 | static struct pernet_operations ip6_route_net_late_ops = { |
3086 | .init = ip6_route_net_init_late, | |
3087 | .exit = ip6_route_net_exit_late, | |
3088 | }; | |
3089 | ||
8ed67789 DL |
3090 | static struct notifier_block ip6_route_dev_notifier = { |
3091 | .notifier_call = ip6_route_dev_notify, | |
3092 | .priority = 0, | |
3093 | }; | |
3094 | ||
433d49c3 | 3095 | int __init ip6_route_init(void) |
1da177e4 | 3096 | { |
433d49c3 DL |
3097 | int ret; |
3098 | ||
9a7ec3a9 DL |
3099 | ret = -ENOMEM; |
3100 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3101 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3102 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3103 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3104 | goto out; |
14e50e57 | 3105 | |
fc66f95c | 3106 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3107 | if (ret) |
bdb3289f | 3108 | goto out_kmem_cache; |
bdb3289f | 3109 | |
c3426b47 DM |
3110 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3111 | if (ret) | |
e8803b6c | 3112 | goto out_dst_entries; |
2a0c451a | 3113 | |
7e52b33b DM |
3114 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3115 | if (ret) | |
3116 | goto out_register_inetpeer; | |
c3426b47 | 3117 | |
5dc121e9 AE |
3118 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3119 | ||
8ed67789 DL |
3120 | /* Registering of the loopback is done before this portion of code, |
3121 | * the loopback reference in rt6_info will not be taken, do it | |
3122 | * manually for init_net */ | |
d8d1f30b | 3123 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3124 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3125 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3126 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3127 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3128 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3129 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3130 | #endif | |
e8803b6c | 3131 | ret = fib6_init(); |
433d49c3 | 3132 | if (ret) |
8ed67789 | 3133 | goto out_register_subsys; |
433d49c3 | 3134 | |
433d49c3 DL |
3135 | ret = xfrm6_init(); |
3136 | if (ret) | |
e8803b6c | 3137 | goto out_fib6_init; |
c35b7e72 | 3138 | |
433d49c3 DL |
3139 | ret = fib6_rules_init(); |
3140 | if (ret) | |
3141 | goto xfrm6_init; | |
7e5449c2 | 3142 | |
d189634e TG |
3143 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3144 | if (ret) | |
3145 | goto fib6_rules_init; | |
3146 | ||
433d49c3 | 3147 | ret = -ENOBUFS; |
c7ac8679 GR |
3148 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3149 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3150 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3151 | goto out_register_late_subsys; |
c127ea2c | 3152 | |
8ed67789 | 3153 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3154 | if (ret) |
d189634e | 3155 | goto out_register_late_subsys; |
8ed67789 | 3156 | |
433d49c3 DL |
3157 | out: |
3158 | return ret; | |
3159 | ||
d189634e TG |
3160 | out_register_late_subsys: |
3161 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3162 | fib6_rules_init: |
433d49c3 DL |
3163 | fib6_rules_cleanup(); |
3164 | xfrm6_init: | |
433d49c3 | 3165 | xfrm6_fini(); |
2a0c451a TG |
3166 | out_fib6_init: |
3167 | fib6_gc_cleanup(); | |
8ed67789 DL |
3168 | out_register_subsys: |
3169 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3170 | out_register_inetpeer: |
3171 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3172 | out_dst_entries: |
3173 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3174 | out_kmem_cache: |
f2fc6a54 | 3175 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3176 | goto out; |
1da177e4 LT |
3177 | } |
3178 | ||
3179 | void ip6_route_cleanup(void) | |
3180 | { | |
8ed67789 | 3181 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3182 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3183 | fib6_rules_cleanup(); |
1da177e4 | 3184 | xfrm6_fini(); |
1da177e4 | 3185 | fib6_gc_cleanup(); |
c3426b47 | 3186 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3187 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3188 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3189 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3190 | } |