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> |
1da177e4 LT |
60 | |
61 | #include <asm/uaccess.h> | |
62 | ||
63 | #ifdef CONFIG_SYSCTL | |
64 | #include <linux/sysctl.h> | |
65 | #endif | |
66 | ||
1716a961 | 67 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 68 | const struct in6_addr *dest); |
1da177e4 | 69 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 70 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 71 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
72 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
73 | static void ip6_dst_destroy(struct dst_entry *); | |
74 | static void ip6_dst_ifdown(struct dst_entry *, | |
75 | struct net_device *dev, int how); | |
569d3645 | 76 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
77 | |
78 | static int ip6_pkt_discard(struct sk_buff *skb); | |
79 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
80 | static void ip6_link_failure(struct sk_buff *skb); | |
81 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
6e157b6a | 82 | static void rt6_do_redirect(struct dst_entry *dst, struct sk_buff *skb); |
1da177e4 | 83 | |
70ceb4f5 | 84 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 85 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
86 | const struct in6_addr *prefix, int prefixlen, |
87 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 88 | unsigned int pref); |
efa2cea0 | 89 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
90 | const struct in6_addr *prefix, int prefixlen, |
91 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
92 | #endif |
93 | ||
06582540 DM |
94 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
95 | { | |
96 | struct rt6_info *rt = (struct rt6_info *) dst; | |
97 | struct inet_peer *peer; | |
98 | u32 *p = NULL; | |
99 | ||
8e2ec639 YZ |
100 | if (!(rt->dst.flags & DST_HOST)) |
101 | return NULL; | |
102 | ||
fbfe95a4 | 103 | peer = rt6_get_peer_create(rt); |
06582540 DM |
104 | if (peer) { |
105 | u32 *old_p = __DST_METRICS_PTR(old); | |
106 | unsigned long prev, new; | |
107 | ||
108 | p = peer->metrics; | |
109 | if (inet_metrics_new(peer)) | |
110 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
111 | ||
112 | new = (unsigned long) p; | |
113 | prev = cmpxchg(&dst->_metrics, old, new); | |
114 | ||
115 | if (prev != old) { | |
116 | p = __DST_METRICS_PTR(prev); | |
117 | if (prev & DST_METRICS_READ_ONLY) | |
118 | p = NULL; | |
119 | } | |
120 | } | |
121 | return p; | |
122 | } | |
123 | ||
f894cbf8 DM |
124 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
125 | struct sk_buff *skb, | |
126 | const void *daddr) | |
39232973 DM |
127 | { |
128 | struct in6_addr *p = &rt->rt6i_gateway; | |
129 | ||
a7563f34 | 130 | if (!ipv6_addr_any(p)) |
39232973 | 131 | return (const void *) p; |
f894cbf8 DM |
132 | else if (skb) |
133 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
134 | return daddr; |
135 | } | |
136 | ||
f894cbf8 DM |
137 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
138 | struct sk_buff *skb, | |
139 | const void *daddr) | |
d3aaeb38 | 140 | { |
39232973 DM |
141 | struct rt6_info *rt = (struct rt6_info *) dst; |
142 | struct neighbour *n; | |
143 | ||
f894cbf8 | 144 | daddr = choose_neigh_daddr(rt, skb, daddr); |
39232973 | 145 | n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr); |
f83c7790 DM |
146 | if (n) |
147 | return n; | |
148 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
149 | } | |
150 | ||
8ade06c6 | 151 | static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev) |
f83c7790 | 152 | { |
8ade06c6 DM |
153 | struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dev, &rt->rt6i_gateway); |
154 | if (!n) { | |
155 | n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev); | |
156 | if (IS_ERR(n)) | |
157 | return PTR_ERR(n); | |
158 | } | |
97cac082 | 159 | rt->n = n; |
f83c7790 DM |
160 | |
161 | return 0; | |
d3aaeb38 DM |
162 | } |
163 | ||
9a7ec3a9 | 164 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 165 | .family = AF_INET6, |
09640e63 | 166 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
167 | .gc = ip6_dst_gc, |
168 | .gc_thresh = 1024, | |
169 | .check = ip6_dst_check, | |
0dbaee3b | 170 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 171 | .mtu = ip6_mtu, |
06582540 | 172 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
173 | .destroy = ip6_dst_destroy, |
174 | .ifdown = ip6_dst_ifdown, | |
175 | .negative_advice = ip6_negative_advice, | |
176 | .link_failure = ip6_link_failure, | |
177 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 178 | .redirect = rt6_do_redirect, |
1ac06e03 | 179 | .local_out = __ip6_local_out, |
d3aaeb38 | 180 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
181 | }; |
182 | ||
ebb762f2 | 183 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 184 | { |
618f9bc7 SK |
185 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
186 | ||
187 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
188 | } |
189 | ||
14e50e57 DM |
190 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
191 | { | |
192 | } | |
193 | ||
0972ddb2 HB |
194 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
195 | unsigned long old) | |
196 | { | |
197 | return NULL; | |
198 | } | |
199 | ||
14e50e57 DM |
200 | static struct dst_ops ip6_dst_blackhole_ops = { |
201 | .family = AF_INET6, | |
09640e63 | 202 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
203 | .destroy = ip6_dst_destroy, |
204 | .check = ip6_dst_check, | |
ebb762f2 | 205 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 206 | .default_advmss = ip6_default_advmss, |
14e50e57 | 207 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
0972ddb2 | 208 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 209 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
210 | }; |
211 | ||
62fa8a84 DM |
212 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
213 | [RTAX_HOPLIMIT - 1] = 255, | |
214 | }; | |
215 | ||
bdb3289f | 216 | static struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
217 | .dst = { |
218 | .__refcnt = ATOMIC_INIT(1), | |
219 | .__use = 1, | |
220 | .obsolete = -1, | |
221 | .error = -ENETUNREACH, | |
d8d1f30b CG |
222 | .input = ip6_pkt_discard, |
223 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
224 | }, |
225 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 226 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
227 | .rt6i_metric = ~(u32) 0, |
228 | .rt6i_ref = ATOMIC_INIT(1), | |
229 | }; | |
230 | ||
101367c2 TG |
231 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
232 | ||
6723ab54 DM |
233 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
234 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 235 | |
280a34c8 | 236 | static struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
237 | .dst = { |
238 | .__refcnt = ATOMIC_INIT(1), | |
239 | .__use = 1, | |
240 | .obsolete = -1, | |
241 | .error = -EACCES, | |
d8d1f30b CG |
242 | .input = ip6_pkt_prohibit, |
243 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
244 | }, |
245 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 246 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
247 | .rt6i_metric = ~(u32) 0, |
248 | .rt6i_ref = ATOMIC_INIT(1), | |
249 | }; | |
250 | ||
bdb3289f | 251 | static struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
252 | .dst = { |
253 | .__refcnt = ATOMIC_INIT(1), | |
254 | .__use = 1, | |
255 | .obsolete = -1, | |
256 | .error = -EINVAL, | |
d8d1f30b CG |
257 | .input = dst_discard, |
258 | .output = dst_discard, | |
101367c2 TG |
259 | }, |
260 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 261 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
262 | .rt6i_metric = ~(u32) 0, |
263 | .rt6i_ref = ATOMIC_INIT(1), | |
264 | }; | |
265 | ||
266 | #endif | |
267 | ||
1da177e4 | 268 | /* allocate dst with ip6_dst_ops */ |
97bab73f | 269 | static inline struct rt6_info *ip6_dst_alloc(struct net *net, |
957c665f | 270 | struct net_device *dev, |
8b96d22d DM |
271 | int flags, |
272 | struct fib6_table *table) | |
1da177e4 | 273 | { |
97bab73f DM |
274 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
275 | 0, 0, flags); | |
cf911662 | 276 | |
97bab73f | 277 | if (rt) { |
a2de86f6 | 278 | memset(&rt->n, 0, |
38308473 | 279 | sizeof(*rt) - sizeof(struct dst_entry)); |
8b96d22d | 280 | rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers); |
97bab73f | 281 | } |
cf911662 | 282 | return rt; |
1da177e4 LT |
283 | } |
284 | ||
285 | static void ip6_dst_destroy(struct dst_entry *dst) | |
286 | { | |
287 | struct rt6_info *rt = (struct rt6_info *)dst; | |
288 | struct inet6_dev *idev = rt->rt6i_idev; | |
289 | ||
97cac082 DM |
290 | if (rt->n) |
291 | neigh_release(rt->n); | |
292 | ||
8e2ec639 YZ |
293 | if (!(rt->dst.flags & DST_HOST)) |
294 | dst_destroy_metrics_generic(dst); | |
295 | ||
38308473 | 296 | if (idev) { |
1da177e4 LT |
297 | rt->rt6i_idev = NULL; |
298 | in6_dev_put(idev); | |
1ab1457c | 299 | } |
1716a961 G |
300 | |
301 | if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from) | |
302 | dst_release(dst->from); | |
303 | ||
97bab73f DM |
304 | if (rt6_has_peer(rt)) { |
305 | struct inet_peer *peer = rt6_peer_ptr(rt); | |
b3419363 DM |
306 | inet_putpeer(peer); |
307 | } | |
308 | } | |
309 | ||
6431cbc2 DM |
310 | static atomic_t __rt6_peer_genid = ATOMIC_INIT(0); |
311 | ||
312 | static u32 rt6_peer_genid(void) | |
313 | { | |
314 | return atomic_read(&__rt6_peer_genid); | |
315 | } | |
316 | ||
b3419363 DM |
317 | void rt6_bind_peer(struct rt6_info *rt, int create) |
318 | { | |
97bab73f | 319 | struct inet_peer_base *base; |
b3419363 DM |
320 | struct inet_peer *peer; |
321 | ||
97bab73f DM |
322 | base = inetpeer_base_ptr(rt->_rt6i_peer); |
323 | if (!base) | |
324 | return; | |
325 | ||
326 | peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create); | |
7b34ca2a DM |
327 | if (peer) { |
328 | if (!rt6_set_peer(rt, peer)) | |
329 | inet_putpeer(peer); | |
330 | else | |
331 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
332 | } | |
1da177e4 LT |
333 | } |
334 | ||
335 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
336 | int how) | |
337 | { | |
338 | struct rt6_info *rt = (struct rt6_info *)dst; | |
339 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 340 | struct net_device *loopback_dev = |
c346dca1 | 341 | dev_net(dev)->loopback_dev; |
1da177e4 | 342 | |
97cac082 DM |
343 | if (dev != loopback_dev) { |
344 | if (idev && idev->dev == dev) { | |
345 | struct inet6_dev *loopback_idev = | |
346 | in6_dev_get(loopback_dev); | |
347 | if (loopback_idev) { | |
348 | rt->rt6i_idev = loopback_idev; | |
349 | in6_dev_put(idev); | |
350 | } | |
351 | } | |
352 | if (rt->n && rt->n->dev == dev) { | |
353 | rt->n->dev = loopback_dev; | |
354 | dev_hold(loopback_dev); | |
355 | dev_put(dev); | |
1da177e4 LT |
356 | } |
357 | } | |
358 | } | |
359 | ||
a50feda5 | 360 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 361 | { |
1716a961 G |
362 | struct rt6_info *ort = NULL; |
363 | ||
364 | if (rt->rt6i_flags & RTF_EXPIRES) { | |
365 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 366 | return true; |
1716a961 G |
367 | } else if (rt->dst.from) { |
368 | ort = (struct rt6_info *) rt->dst.from; | |
369 | return (ort->rt6i_flags & RTF_EXPIRES) && | |
370 | time_after(jiffies, ort->dst.expires); | |
371 | } | |
a50feda5 | 372 | return false; |
1da177e4 LT |
373 | } |
374 | ||
a50feda5 | 375 | static bool rt6_need_strict(const struct in6_addr *daddr) |
c71099ac | 376 | { |
a02cec21 ED |
377 | return ipv6_addr_type(daddr) & |
378 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
379 | } |
380 | ||
1da177e4 | 381 | /* |
c71099ac | 382 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
383 | */ |
384 | ||
8ed67789 DL |
385 | static inline struct rt6_info *rt6_device_match(struct net *net, |
386 | struct rt6_info *rt, | |
b71d1d42 | 387 | const struct in6_addr *saddr, |
1da177e4 | 388 | int oif, |
d420895e | 389 | int flags) |
1da177e4 LT |
390 | { |
391 | struct rt6_info *local = NULL; | |
392 | struct rt6_info *sprt; | |
393 | ||
dd3abc4e YH |
394 | if (!oif && ipv6_addr_any(saddr)) |
395 | goto out; | |
396 | ||
d8d1f30b | 397 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 398 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
399 | |
400 | if (oif) { | |
1da177e4 LT |
401 | if (dev->ifindex == oif) |
402 | return sprt; | |
403 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 404 | if (!sprt->rt6i_idev || |
1da177e4 | 405 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 406 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 407 | continue; |
1ab1457c | 408 | if (local && (!oif || |
1da177e4 LT |
409 | local->rt6i_idev->dev->ifindex == oif)) |
410 | continue; | |
411 | } | |
412 | local = sprt; | |
413 | } | |
dd3abc4e YH |
414 | } else { |
415 | if (ipv6_chk_addr(net, saddr, dev, | |
416 | flags & RT6_LOOKUP_F_IFACE)) | |
417 | return sprt; | |
1da177e4 | 418 | } |
dd3abc4e | 419 | } |
1da177e4 | 420 | |
dd3abc4e | 421 | if (oif) { |
1da177e4 LT |
422 | if (local) |
423 | return local; | |
424 | ||
d420895e | 425 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 426 | return net->ipv6.ip6_null_entry; |
1da177e4 | 427 | } |
dd3abc4e | 428 | out: |
1da177e4 LT |
429 | return rt; |
430 | } | |
431 | ||
27097255 YH |
432 | #ifdef CONFIG_IPV6_ROUTER_PREF |
433 | static void rt6_probe(struct rt6_info *rt) | |
434 | { | |
f2c31e32 | 435 | struct neighbour *neigh; |
27097255 YH |
436 | /* |
437 | * Okay, this does not seem to be appropriate | |
438 | * for now, however, we need to check if it | |
439 | * is really so; aka Router Reachability Probing. | |
440 | * | |
441 | * Router Reachability Probe MUST be rate-limited | |
442 | * to no more than one per minute. | |
443 | */ | |
f2c31e32 | 444 | rcu_read_lock(); |
97cac082 | 445 | neigh = rt ? rt->n : NULL; |
27097255 | 446 | if (!neigh || (neigh->nud_state & NUD_VALID)) |
f2c31e32 | 447 | goto out; |
27097255 YH |
448 | read_lock_bh(&neigh->lock); |
449 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 450 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
451 | struct in6_addr mcaddr; |
452 | struct in6_addr *target; | |
453 | ||
454 | neigh->updated = jiffies; | |
455 | read_unlock_bh(&neigh->lock); | |
456 | ||
457 | target = (struct in6_addr *)&neigh->primary_key; | |
458 | addrconf_addr_solict_mult(target, &mcaddr); | |
d1918542 | 459 | ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL); |
f2c31e32 | 460 | } else { |
27097255 | 461 | read_unlock_bh(&neigh->lock); |
f2c31e32 ED |
462 | } |
463 | out: | |
464 | rcu_read_unlock(); | |
27097255 YH |
465 | } |
466 | #else | |
467 | static inline void rt6_probe(struct rt6_info *rt) | |
468 | { | |
27097255 YH |
469 | } |
470 | #endif | |
471 | ||
1da177e4 | 472 | /* |
554cfb7e | 473 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 474 | */ |
b6f99a21 | 475 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 476 | { |
d1918542 | 477 | struct net_device *dev = rt->dst.dev; |
161980f4 | 478 | if (!oif || dev->ifindex == oif) |
554cfb7e | 479 | return 2; |
161980f4 DM |
480 | if ((dev->flags & IFF_LOOPBACK) && |
481 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
482 | return 1; | |
483 | return 0; | |
554cfb7e | 484 | } |
1da177e4 | 485 | |
b6f99a21 | 486 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 487 | { |
f2c31e32 | 488 | struct neighbour *neigh; |
398bcbeb | 489 | int m; |
f2c31e32 ED |
490 | |
491 | rcu_read_lock(); | |
97cac082 | 492 | neigh = rt->n; |
4d0c5911 YH |
493 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
494 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
495 | m = 1; | |
496 | else if (neigh) { | |
554cfb7e YH |
497 | read_lock_bh(&neigh->lock); |
498 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 499 | m = 2; |
398bcbeb YH |
500 | #ifdef CONFIG_IPV6_ROUTER_PREF |
501 | else if (neigh->nud_state & NUD_FAILED) | |
502 | m = 0; | |
503 | #endif | |
504 | else | |
ea73ee23 | 505 | m = 1; |
554cfb7e | 506 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
507 | } else |
508 | m = 0; | |
f2c31e32 | 509 | rcu_read_unlock(); |
554cfb7e | 510 | return m; |
1da177e4 LT |
511 | } |
512 | ||
554cfb7e YH |
513 | static int rt6_score_route(struct rt6_info *rt, int oif, |
514 | int strict) | |
1da177e4 | 515 | { |
4d0c5911 | 516 | int m, n; |
1ab1457c | 517 | |
4d0c5911 | 518 | m = rt6_check_dev(rt, oif); |
77d16f45 | 519 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 520 | return -1; |
ebacaaa0 YH |
521 | #ifdef CONFIG_IPV6_ROUTER_PREF |
522 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
523 | #endif | |
4d0c5911 | 524 | n = rt6_check_neigh(rt); |
557e92ef | 525 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
526 | return -1; |
527 | return m; | |
528 | } | |
529 | ||
f11e6659 DM |
530 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
531 | int *mpri, struct rt6_info *match) | |
554cfb7e | 532 | { |
f11e6659 DM |
533 | int m; |
534 | ||
535 | if (rt6_check_expired(rt)) | |
536 | goto out; | |
537 | ||
538 | m = rt6_score_route(rt, oif, strict); | |
539 | if (m < 0) | |
540 | goto out; | |
541 | ||
542 | if (m > *mpri) { | |
543 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
544 | rt6_probe(match); | |
545 | *mpri = m; | |
546 | match = rt; | |
547 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
548 | rt6_probe(rt); | |
549 | } | |
550 | ||
551 | out: | |
552 | return match; | |
553 | } | |
554 | ||
555 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
556 | struct rt6_info *rr_head, | |
557 | u32 metric, int oif, int strict) | |
558 | { | |
559 | struct rt6_info *rt, *match; | |
554cfb7e | 560 | int mpri = -1; |
1da177e4 | 561 | |
f11e6659 DM |
562 | match = NULL; |
563 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 564 | rt = rt->dst.rt6_next) |
f11e6659 DM |
565 | match = find_match(rt, oif, strict, &mpri, match); |
566 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 567 | rt = rt->dst.rt6_next) |
f11e6659 | 568 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 569 | |
f11e6659 DM |
570 | return match; |
571 | } | |
1da177e4 | 572 | |
f11e6659 DM |
573 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
574 | { | |
575 | struct rt6_info *match, *rt0; | |
8ed67789 | 576 | struct net *net; |
1da177e4 | 577 | |
f11e6659 DM |
578 | rt0 = fn->rr_ptr; |
579 | if (!rt0) | |
580 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 581 | |
f11e6659 | 582 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 583 | |
554cfb7e | 584 | if (!match && |
f11e6659 | 585 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 586 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 587 | |
554cfb7e | 588 | /* no entries matched; do round-robin */ |
f11e6659 DM |
589 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
590 | next = fn->leaf; | |
591 | ||
592 | if (next != rt0) | |
593 | fn->rr_ptr = next; | |
1da177e4 | 594 | } |
1da177e4 | 595 | |
d1918542 | 596 | net = dev_net(rt0->dst.dev); |
a02cec21 | 597 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
598 | } |
599 | ||
70ceb4f5 YH |
600 | #ifdef CONFIG_IPV6_ROUTE_INFO |
601 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 602 | const struct in6_addr *gwaddr) |
70ceb4f5 | 603 | { |
c346dca1 | 604 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
605 | struct route_info *rinfo = (struct route_info *) opt; |
606 | struct in6_addr prefix_buf, *prefix; | |
607 | unsigned int pref; | |
4bed72e4 | 608 | unsigned long lifetime; |
70ceb4f5 YH |
609 | struct rt6_info *rt; |
610 | ||
611 | if (len < sizeof(struct route_info)) { | |
612 | return -EINVAL; | |
613 | } | |
614 | ||
615 | /* Sanity check for prefix_len and length */ | |
616 | if (rinfo->length > 3) { | |
617 | return -EINVAL; | |
618 | } else if (rinfo->prefix_len > 128) { | |
619 | return -EINVAL; | |
620 | } else if (rinfo->prefix_len > 64) { | |
621 | if (rinfo->length < 2) { | |
622 | return -EINVAL; | |
623 | } | |
624 | } else if (rinfo->prefix_len > 0) { | |
625 | if (rinfo->length < 1) { | |
626 | return -EINVAL; | |
627 | } | |
628 | } | |
629 | ||
630 | pref = rinfo->route_pref; | |
631 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 632 | return -EINVAL; |
70ceb4f5 | 633 | |
4bed72e4 | 634 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
635 | |
636 | if (rinfo->length == 3) | |
637 | prefix = (struct in6_addr *)rinfo->prefix; | |
638 | else { | |
639 | /* this function is safe */ | |
640 | ipv6_addr_prefix(&prefix_buf, | |
641 | (struct in6_addr *)rinfo->prefix, | |
642 | rinfo->prefix_len); | |
643 | prefix = &prefix_buf; | |
644 | } | |
645 | ||
efa2cea0 DL |
646 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
647 | dev->ifindex); | |
70ceb4f5 YH |
648 | |
649 | if (rt && !lifetime) { | |
e0a1ad73 | 650 | ip6_del_rt(rt); |
70ceb4f5 YH |
651 | rt = NULL; |
652 | } | |
653 | ||
654 | if (!rt && lifetime) | |
efa2cea0 | 655 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
656 | pref); |
657 | else if (rt) | |
658 | rt->rt6i_flags = RTF_ROUTEINFO | | |
659 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
660 | ||
661 | if (rt) { | |
1716a961 G |
662 | if (!addrconf_finite_timeout(lifetime)) |
663 | rt6_clean_expires(rt); | |
664 | else | |
665 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
666 | ||
d8d1f30b | 667 | dst_release(&rt->dst); |
70ceb4f5 YH |
668 | } |
669 | return 0; | |
670 | } | |
671 | #endif | |
672 | ||
8ed67789 | 673 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 674 | do { \ |
8ed67789 | 675 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 676 | struct fib6_node *pn; \ |
e0eda7bb | 677 | while (1) { \ |
982f56f3 YH |
678 | if (fn->fn_flags & RTN_TL_ROOT) \ |
679 | goto out; \ | |
680 | pn = fn->parent; \ | |
681 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 682 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
683 | else \ |
684 | fn = pn; \ | |
685 | if (fn->fn_flags & RTN_RTINFO) \ | |
686 | goto restart; \ | |
c71099ac | 687 | } \ |
c71099ac | 688 | } \ |
38308473 | 689 | } while (0) |
c71099ac | 690 | |
8ed67789 DL |
691 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
692 | struct fib6_table *table, | |
4c9483b2 | 693 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
694 | { |
695 | struct fib6_node *fn; | |
696 | struct rt6_info *rt; | |
697 | ||
c71099ac | 698 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 699 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
700 | restart: |
701 | rt = fn->leaf; | |
4c9483b2 DM |
702 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
703 | BACKTRACK(net, &fl6->saddr); | |
c71099ac | 704 | out: |
d8d1f30b | 705 | dst_use(&rt->dst, jiffies); |
c71099ac | 706 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
707 | return rt; |
708 | ||
709 | } | |
710 | ||
ea6e574e FW |
711 | struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
712 | int flags) | |
713 | { | |
714 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
715 | } | |
716 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
717 | ||
9acd9f3a YH |
718 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
719 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 720 | { |
4c9483b2 DM |
721 | struct flowi6 fl6 = { |
722 | .flowi6_oif = oif, | |
723 | .daddr = *daddr, | |
c71099ac TG |
724 | }; |
725 | struct dst_entry *dst; | |
77d16f45 | 726 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 727 | |
adaa70bb | 728 | if (saddr) { |
4c9483b2 | 729 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
730 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
731 | } | |
732 | ||
4c9483b2 | 733 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
734 | if (dst->error == 0) |
735 | return (struct rt6_info *) dst; | |
736 | ||
737 | dst_release(dst); | |
738 | ||
1da177e4 LT |
739 | return NULL; |
740 | } | |
741 | ||
7159039a YH |
742 | EXPORT_SYMBOL(rt6_lookup); |
743 | ||
c71099ac | 744 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
745 | It takes new route entry, the addition fails by any reason the |
746 | route is freed. In any case, if caller does not hold it, it may | |
747 | be destroyed. | |
748 | */ | |
749 | ||
86872cb5 | 750 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
751 | { |
752 | int err; | |
c71099ac | 753 | struct fib6_table *table; |
1da177e4 | 754 | |
c71099ac TG |
755 | table = rt->rt6i_table; |
756 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 757 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 758 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
759 | |
760 | return err; | |
761 | } | |
762 | ||
40e22e8f TG |
763 | int ip6_ins_rt(struct rt6_info *rt) |
764 | { | |
4d1169c1 | 765 | struct nl_info info = { |
d1918542 | 766 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 767 | }; |
528c4ceb | 768 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
769 | } |
770 | ||
1716a961 | 771 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, |
21efcfa0 | 772 | const struct in6_addr *daddr, |
b71d1d42 | 773 | const struct in6_addr *saddr) |
1da177e4 | 774 | { |
1da177e4 LT |
775 | struct rt6_info *rt; |
776 | ||
777 | /* | |
778 | * Clone the route. | |
779 | */ | |
780 | ||
21efcfa0 | 781 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
782 | |
783 | if (rt) { | |
14deae41 DM |
784 | int attempts = !in_softirq(); |
785 | ||
38308473 | 786 | if (!(rt->rt6i_flags & RTF_GATEWAY)) { |
bb3c3686 | 787 | if (ort->rt6i_dst.plen != 128 && |
21efcfa0 | 788 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) |
58c4fb86 | 789 | rt->rt6i_flags |= RTF_ANYCAST; |
4e3fd7a0 | 790 | rt->rt6i_gateway = *daddr; |
58c4fb86 | 791 | } |
1da177e4 | 792 | |
1da177e4 | 793 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
794 | |
795 | #ifdef CONFIG_IPV6_SUBTREES | |
796 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 797 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
798 | rt->rt6i_src.plen = 128; |
799 | } | |
800 | #endif | |
801 | ||
14deae41 | 802 | retry: |
8ade06c6 | 803 | if (rt6_bind_neighbour(rt, rt->dst.dev)) { |
d1918542 | 804 | struct net *net = dev_net(rt->dst.dev); |
14deae41 DM |
805 | int saved_rt_min_interval = |
806 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
807 | int saved_rt_elasticity = | |
808 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
809 | ||
810 | if (attempts-- > 0) { | |
811 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
812 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
813 | ||
86393e52 | 814 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
815 | |
816 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
817 | saved_rt_elasticity; | |
818 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
819 | saved_rt_min_interval; | |
820 | goto retry; | |
821 | } | |
822 | ||
f3213831 | 823 | net_warn_ratelimited("Neighbour table overflow\n"); |
d8d1f30b | 824 | dst_free(&rt->dst); |
14deae41 DM |
825 | return NULL; |
826 | } | |
95a9a5ba | 827 | } |
1da177e4 | 828 | |
95a9a5ba YH |
829 | return rt; |
830 | } | |
1da177e4 | 831 | |
21efcfa0 ED |
832 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
833 | const struct in6_addr *daddr) | |
299d9939 | 834 | { |
21efcfa0 ED |
835 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
836 | ||
299d9939 | 837 | if (rt) { |
299d9939 | 838 | rt->rt6i_flags |= RTF_CACHE; |
97cac082 | 839 | rt->n = neigh_clone(ort->n); |
299d9939 YH |
840 | } |
841 | return rt; | |
842 | } | |
843 | ||
8ed67789 | 844 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 845 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
846 | { |
847 | struct fib6_node *fn; | |
519fbd87 | 848 | struct rt6_info *rt, *nrt; |
c71099ac | 849 | int strict = 0; |
1da177e4 | 850 | int attempts = 3; |
519fbd87 | 851 | int err; |
53b7997f | 852 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 853 | |
77d16f45 | 854 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
855 | |
856 | relookup: | |
c71099ac | 857 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 858 | |
8238dd06 | 859 | restart_2: |
4c9483b2 | 860 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
861 | |
862 | restart: | |
4acad72d | 863 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 | 864 | |
4c9483b2 | 865 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 866 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 867 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 868 | goto out; |
1da177e4 | 869 | |
d8d1f30b | 870 | dst_hold(&rt->dst); |
c71099ac | 871 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 872 | |
97cac082 | 873 | if (!rt->n && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
4c9483b2 | 874 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 875 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 876 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
877 | else |
878 | goto out2; | |
e40cf353 | 879 | |
d8d1f30b | 880 | dst_release(&rt->dst); |
8ed67789 | 881 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 882 | |
d8d1f30b | 883 | dst_hold(&rt->dst); |
519fbd87 | 884 | if (nrt) { |
40e22e8f | 885 | err = ip6_ins_rt(nrt); |
519fbd87 | 886 | if (!err) |
1da177e4 | 887 | goto out2; |
1da177e4 | 888 | } |
1da177e4 | 889 | |
519fbd87 YH |
890 | if (--attempts <= 0) |
891 | goto out2; | |
892 | ||
893 | /* | |
c71099ac | 894 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
895 | * released someone could insert this route. Relookup. |
896 | */ | |
d8d1f30b | 897 | dst_release(&rt->dst); |
519fbd87 YH |
898 | goto relookup; |
899 | ||
900 | out: | |
8238dd06 YH |
901 | if (reachable) { |
902 | reachable = 0; | |
903 | goto restart_2; | |
904 | } | |
d8d1f30b | 905 | dst_hold(&rt->dst); |
c71099ac | 906 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 907 | out2: |
d8d1f30b CG |
908 | rt->dst.lastuse = jiffies; |
909 | rt->dst.__use++; | |
c71099ac TG |
910 | |
911 | return rt; | |
1da177e4 LT |
912 | } |
913 | ||
8ed67789 | 914 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 915 | struct flowi6 *fl6, int flags) |
4acad72d | 916 | { |
4c9483b2 | 917 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
918 | } |
919 | ||
72331bc0 SL |
920 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
921 | struct net_device *dev, | |
922 | struct flowi6 *fl6, int flags) | |
923 | { | |
924 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
925 | flags |= RT6_LOOKUP_F_IFACE; | |
926 | ||
927 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
928 | } | |
929 | ||
c71099ac TG |
930 | void ip6_route_input(struct sk_buff *skb) |
931 | { | |
b71d1d42 | 932 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 933 | struct net *net = dev_net(skb->dev); |
adaa70bb | 934 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
935 | struct flowi6 fl6 = { |
936 | .flowi6_iif = skb->dev->ifindex, | |
937 | .daddr = iph->daddr, | |
938 | .saddr = iph->saddr, | |
38308473 | 939 | .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK, |
4c9483b2 DM |
940 | .flowi6_mark = skb->mark, |
941 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 942 | }; |
adaa70bb | 943 | |
72331bc0 | 944 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
945 | } |
946 | ||
8ed67789 | 947 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 948 | struct flowi6 *fl6, int flags) |
1da177e4 | 949 | { |
4c9483b2 | 950 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
951 | } |
952 | ||
9c7a4f9c | 953 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 954 | struct flowi6 *fl6) |
c71099ac TG |
955 | { |
956 | int flags = 0; | |
957 | ||
4dc27d1c DM |
958 | fl6->flowi6_iif = net->loopback_dev->ifindex; |
959 | ||
4c9483b2 | 960 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 961 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 962 | |
4c9483b2 | 963 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 964 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
965 | else if (sk) |
966 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 967 | |
4c9483b2 | 968 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
969 | } |
970 | ||
7159039a | 971 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 972 | |
2774c131 | 973 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 974 | { |
5c1e6aa3 | 975 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
976 | struct dst_entry *new = NULL; |
977 | ||
5c1e6aa3 | 978 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, 0, 0); |
14e50e57 | 979 | if (rt) { |
cf911662 | 980 | memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry)); |
97bab73f | 981 | rt6_init_peer(rt, net->ipv6.peers); |
cf911662 | 982 | |
d8d1f30b | 983 | new = &rt->dst; |
14e50e57 | 984 | |
14e50e57 | 985 | new->__use = 1; |
352e512c HX |
986 | new->input = dst_discard; |
987 | new->output = dst_discard; | |
14e50e57 | 988 | |
21efcfa0 ED |
989 | if (dst_metrics_read_only(&ort->dst)) |
990 | new->_metrics = ort->dst._metrics; | |
991 | else | |
992 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
993 | rt->rt6i_idev = ort->rt6i_idev; |
994 | if (rt->rt6i_idev) | |
995 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 996 | |
4e3fd7a0 | 997 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
998 | rt->rt6i_flags = ort->rt6i_flags; |
999 | rt6_clean_expires(rt); | |
14e50e57 DM |
1000 | rt->rt6i_metric = 0; |
1001 | ||
1002 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1003 | #ifdef CONFIG_IPV6_SUBTREES | |
1004 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1005 | #endif | |
1006 | ||
1007 | dst_free(new); | |
1008 | } | |
1009 | ||
69ead7af DM |
1010 | dst_release(dst_orig); |
1011 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1012 | } |
14e50e57 | 1013 | |
1da177e4 LT |
1014 | /* |
1015 | * Destination cache support functions | |
1016 | */ | |
1017 | ||
1018 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
1019 | { | |
1020 | struct rt6_info *rt; | |
1021 | ||
1022 | rt = (struct rt6_info *) dst; | |
1023 | ||
6431cbc2 DM |
1024 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) { |
1025 | if (rt->rt6i_peer_genid != rt6_peer_genid()) { | |
97bab73f | 1026 | if (!rt6_has_peer(rt)) |
6431cbc2 DM |
1027 | rt6_bind_peer(rt, 0); |
1028 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
1029 | } | |
1da177e4 | 1030 | return dst; |
6431cbc2 | 1031 | } |
1da177e4 LT |
1032 | return NULL; |
1033 | } | |
1034 | ||
1035 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1036 | { | |
1037 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1038 | ||
1039 | if (rt) { | |
54c1a859 YH |
1040 | if (rt->rt6i_flags & RTF_CACHE) { |
1041 | if (rt6_check_expired(rt)) { | |
1042 | ip6_del_rt(rt); | |
1043 | dst = NULL; | |
1044 | } | |
1045 | } else { | |
1da177e4 | 1046 | dst_release(dst); |
54c1a859 YH |
1047 | dst = NULL; |
1048 | } | |
1da177e4 | 1049 | } |
54c1a859 | 1050 | return dst; |
1da177e4 LT |
1051 | } |
1052 | ||
1053 | static void ip6_link_failure(struct sk_buff *skb) | |
1054 | { | |
1055 | struct rt6_info *rt; | |
1056 | ||
3ffe533c | 1057 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1058 | |
adf30907 | 1059 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1060 | if (rt) { |
1716a961 G |
1061 | if (rt->rt6i_flags & RTF_CACHE) |
1062 | rt6_update_expires(rt, 0); | |
1063 | else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
1da177e4 LT |
1064 | rt->rt6i_node->fn_sernum = -1; |
1065 | } | |
1066 | } | |
1067 | ||
1068 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1069 | { | |
1070 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
1071 | ||
81aded24 | 1072 | dst_confirm(dst); |
1da177e4 | 1073 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { |
81aded24 DM |
1074 | struct net *net = dev_net(dst->dev); |
1075 | ||
1da177e4 LT |
1076 | rt6->rt6i_flags |= RTF_MODIFIED; |
1077 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 1078 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 1079 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
1080 | features |= RTAX_FEATURE_ALLFRAG; |
1081 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 1082 | } |
defb3519 | 1083 | dst_metric_set(dst, RTAX_MTU, mtu); |
81aded24 | 1084 | rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1085 | } |
1086 | } | |
1087 | ||
42ae66c8 DM |
1088 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
1089 | int oif, u32 mark) | |
81aded24 DM |
1090 | { |
1091 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1092 | struct dst_entry *dst; | |
1093 | struct flowi6 fl6; | |
1094 | ||
1095 | memset(&fl6, 0, sizeof(fl6)); | |
1096 | fl6.flowi6_oif = oif; | |
1097 | fl6.flowi6_mark = mark; | |
3e12939a | 1098 | fl6.flowi6_flags = 0; |
81aded24 DM |
1099 | fl6.daddr = iph->daddr; |
1100 | fl6.saddr = iph->saddr; | |
1101 | fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK; | |
1102 | ||
1103 | dst = ip6_route_output(net, NULL, &fl6); | |
1104 | if (!dst->error) | |
1105 | ip6_rt_update_pmtu(dst, ntohl(mtu)); | |
1106 | dst_release(dst); | |
1107 | } | |
1108 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1109 | ||
1110 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1111 | { | |
1112 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
1113 | sk->sk_bound_dev_if, sk->sk_mark); | |
1114 | } | |
1115 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1116 | ||
3a5ad2ee DM |
1117 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1118 | { | |
1119 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1120 | struct dst_entry *dst; | |
1121 | struct flowi6 fl6; | |
1122 | ||
1123 | memset(&fl6, 0, sizeof(fl6)); | |
1124 | fl6.flowi6_oif = oif; | |
1125 | fl6.flowi6_mark = mark; | |
1126 | fl6.flowi6_flags = 0; | |
1127 | fl6.daddr = iph->daddr; | |
1128 | fl6.saddr = iph->saddr; | |
1129 | fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK; | |
1130 | ||
1131 | dst = ip6_route_output(net, NULL, &fl6); | |
1132 | if (!dst->error) | |
1133 | rt6_do_redirect(dst, skb); | |
1134 | dst_release(dst); | |
1135 | } | |
1136 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1137 | ||
1138 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1139 | { | |
1140 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1141 | } | |
1142 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1143 | ||
0dbaee3b | 1144 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1145 | { |
0dbaee3b DM |
1146 | struct net_device *dev = dst->dev; |
1147 | unsigned int mtu = dst_mtu(dst); | |
1148 | struct net *net = dev_net(dev); | |
1149 | ||
1da177e4 LT |
1150 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1151 | ||
5578689a DL |
1152 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1153 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1154 | |
1155 | /* | |
1ab1457c YH |
1156 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1157 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1158 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1159 | * rely only on pmtu discovery" |
1160 | */ | |
1161 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1162 | mtu = IPV6_MAXPLEN; | |
1163 | return mtu; | |
1164 | } | |
1165 | ||
ebb762f2 | 1166 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1167 | { |
d33e4553 | 1168 | struct inet6_dev *idev; |
618f9bc7 SK |
1169 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1170 | ||
1171 | if (mtu) | |
1172 | return mtu; | |
1173 | ||
1174 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1175 | |
1176 | rcu_read_lock(); | |
1177 | idev = __in6_dev_get(dst->dev); | |
1178 | if (idev) | |
1179 | mtu = idev->cnf.mtu6; | |
1180 | rcu_read_unlock(); | |
1181 | ||
1182 | return mtu; | |
1183 | } | |
1184 | ||
3b00944c YH |
1185 | static struct dst_entry *icmp6_dst_gc_list; |
1186 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1187 | |
3b00944c | 1188 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 1189 | struct neighbour *neigh, |
87a11578 | 1190 | struct flowi6 *fl6) |
1da177e4 | 1191 | { |
87a11578 | 1192 | struct dst_entry *dst; |
1da177e4 LT |
1193 | struct rt6_info *rt; |
1194 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1195 | struct net *net = dev_net(dev); |
1da177e4 | 1196 | |
38308473 | 1197 | if (unlikely(!idev)) |
122bdf67 | 1198 | return ERR_PTR(-ENODEV); |
1da177e4 | 1199 | |
8b96d22d | 1200 | rt = ip6_dst_alloc(net, dev, 0, NULL); |
38308473 | 1201 | if (unlikely(!rt)) { |
1da177e4 | 1202 | in6_dev_put(idev); |
87a11578 | 1203 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1204 | goto out; |
1205 | } | |
1206 | ||
1da177e4 LT |
1207 | if (neigh) |
1208 | neigh_hold(neigh); | |
14deae41 | 1209 | else { |
f894cbf8 | 1210 | neigh = ip6_neigh_lookup(&rt->dst, NULL, &fl6->daddr); |
b43faac6 | 1211 | if (IS_ERR(neigh)) { |
252c3d84 | 1212 | in6_dev_put(idev); |
b43faac6 DM |
1213 | dst_free(&rt->dst); |
1214 | return ERR_CAST(neigh); | |
1215 | } | |
14deae41 | 1216 | } |
1da177e4 | 1217 | |
8e2ec639 YZ |
1218 | rt->dst.flags |= DST_HOST; |
1219 | rt->dst.output = ip6_output; | |
97cac082 | 1220 | rt->n = neigh; |
d8d1f30b | 1221 | atomic_set(&rt->dst.__refcnt, 1); |
87a11578 | 1222 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1223 | rt->rt6i_dst.plen = 128; |
1224 | rt->rt6i_idev = idev; | |
7011687f | 1225 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255); |
1da177e4 | 1226 | |
3b00944c | 1227 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1228 | rt->dst.next = icmp6_dst_gc_list; |
1229 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1230 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1231 | |
5578689a | 1232 | fib6_force_start_gc(net); |
1da177e4 | 1233 | |
87a11578 DM |
1234 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1235 | ||
1da177e4 | 1236 | out: |
87a11578 | 1237 | return dst; |
1da177e4 LT |
1238 | } |
1239 | ||
3d0f24a7 | 1240 | int icmp6_dst_gc(void) |
1da177e4 | 1241 | { |
e9476e95 | 1242 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1243 | int more = 0; |
1da177e4 | 1244 | |
3b00944c YH |
1245 | spin_lock_bh(&icmp6_dst_lock); |
1246 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1247 | |
1da177e4 LT |
1248 | while ((dst = *pprev) != NULL) { |
1249 | if (!atomic_read(&dst->__refcnt)) { | |
1250 | *pprev = dst->next; | |
1251 | dst_free(dst); | |
1da177e4 LT |
1252 | } else { |
1253 | pprev = &dst->next; | |
3d0f24a7 | 1254 | ++more; |
1da177e4 LT |
1255 | } |
1256 | } | |
1257 | ||
3b00944c | 1258 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1259 | |
3d0f24a7 | 1260 | return more; |
1da177e4 LT |
1261 | } |
1262 | ||
1e493d19 DM |
1263 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1264 | void *arg) | |
1265 | { | |
1266 | struct dst_entry *dst, **pprev; | |
1267 | ||
1268 | spin_lock_bh(&icmp6_dst_lock); | |
1269 | pprev = &icmp6_dst_gc_list; | |
1270 | while ((dst = *pprev) != NULL) { | |
1271 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1272 | if (func(rt, arg)) { | |
1273 | *pprev = dst->next; | |
1274 | dst_free(dst); | |
1275 | } else { | |
1276 | pprev = &dst->next; | |
1277 | } | |
1278 | } | |
1279 | spin_unlock_bh(&icmp6_dst_lock); | |
1280 | } | |
1281 | ||
569d3645 | 1282 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1283 | { |
1da177e4 | 1284 | unsigned long now = jiffies; |
86393e52 | 1285 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1286 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1287 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1288 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1289 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1290 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1291 | int entries; |
7019b78e | 1292 | |
fc66f95c | 1293 | entries = dst_entries_get_fast(ops); |
7019b78e | 1294 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1295 | entries <= rt_max_size) |
1da177e4 LT |
1296 | goto out; |
1297 | ||
6891a346 BT |
1298 | net->ipv6.ip6_rt_gc_expire++; |
1299 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1300 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1301 | entries = dst_entries_get_slow(ops); |
1302 | if (entries < ops->gc_thresh) | |
7019b78e | 1303 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1304 | out: |
7019b78e | 1305 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1306 | return entries > rt_max_size; |
1da177e4 LT |
1307 | } |
1308 | ||
1309 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1310 | but results in cleaner routing tables. | |
1311 | ||
1312 | Remove it only when all the things will work! | |
1313 | */ | |
1314 | ||
6b75d090 | 1315 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1316 | { |
5170ae82 | 1317 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1318 | if (hoplimit == 0) { |
6b75d090 | 1319 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1320 | struct inet6_dev *idev; |
1321 | ||
1322 | rcu_read_lock(); | |
1323 | idev = __in6_dev_get(dev); | |
1324 | if (idev) | |
6b75d090 | 1325 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1326 | else |
53b7997f | 1327 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1328 | rcu_read_unlock(); |
1da177e4 LT |
1329 | } |
1330 | return hoplimit; | |
1331 | } | |
abbf46ae | 1332 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1333 | |
1334 | /* | |
1335 | * | |
1336 | */ | |
1337 | ||
86872cb5 | 1338 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1339 | { |
1340 | int err; | |
5578689a | 1341 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1342 | struct rt6_info *rt = NULL; |
1343 | struct net_device *dev = NULL; | |
1344 | struct inet6_dev *idev = NULL; | |
c71099ac | 1345 | struct fib6_table *table; |
1da177e4 LT |
1346 | int addr_type; |
1347 | ||
86872cb5 | 1348 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1349 | return -EINVAL; |
1350 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1351 | if (cfg->fc_src_len) |
1da177e4 LT |
1352 | return -EINVAL; |
1353 | #endif | |
86872cb5 | 1354 | if (cfg->fc_ifindex) { |
1da177e4 | 1355 | err = -ENODEV; |
5578689a | 1356 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1357 | if (!dev) |
1358 | goto out; | |
1359 | idev = in6_dev_get(dev); | |
1360 | if (!idev) | |
1361 | goto out; | |
1362 | } | |
1363 | ||
86872cb5 TG |
1364 | if (cfg->fc_metric == 0) |
1365 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1366 | |
d71314b4 | 1367 | err = -ENOBUFS; |
38308473 DM |
1368 | if (cfg->fc_nlinfo.nlh && |
1369 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1370 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1371 | if (!table) { |
f3213831 | 1372 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1373 | table = fib6_new_table(net, cfg->fc_table); |
1374 | } | |
1375 | } else { | |
1376 | table = fib6_new_table(net, cfg->fc_table); | |
1377 | } | |
38308473 DM |
1378 | |
1379 | if (!table) | |
c71099ac | 1380 | goto out; |
c71099ac | 1381 | |
8b96d22d | 1382 | rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table); |
1da177e4 | 1383 | |
38308473 | 1384 | if (!rt) { |
1da177e4 LT |
1385 | err = -ENOMEM; |
1386 | goto out; | |
1387 | } | |
1388 | ||
d8d1f30b | 1389 | rt->dst.obsolete = -1; |
1716a961 G |
1390 | |
1391 | if (cfg->fc_flags & RTF_EXPIRES) | |
1392 | rt6_set_expires(rt, jiffies + | |
1393 | clock_t_to_jiffies(cfg->fc_expires)); | |
1394 | else | |
1395 | rt6_clean_expires(rt); | |
1da177e4 | 1396 | |
86872cb5 TG |
1397 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1398 | cfg->fc_protocol = RTPROT_BOOT; | |
1399 | rt->rt6i_protocol = cfg->fc_protocol; | |
1400 | ||
1401 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1402 | |
1403 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1404 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1405 | else if (cfg->fc_flags & RTF_LOCAL) |
1406 | rt->dst.input = ip6_input; | |
1da177e4 | 1407 | else |
d8d1f30b | 1408 | rt->dst.input = ip6_forward; |
1da177e4 | 1409 | |
d8d1f30b | 1410 | rt->dst.output = ip6_output; |
1da177e4 | 1411 | |
86872cb5 TG |
1412 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1413 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1414 | if (rt->rt6i_dst.plen == 128) |
11d53b49 | 1415 | rt->dst.flags |= DST_HOST; |
1da177e4 | 1416 | |
8e2ec639 YZ |
1417 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
1418 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1419 | if (!metrics) { | |
1420 | err = -ENOMEM; | |
1421 | goto out; | |
1422 | } | |
1423 | dst_init_metrics(&rt->dst, metrics, 0); | |
1424 | } | |
1da177e4 | 1425 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1426 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1427 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1428 | #endif |
1429 | ||
86872cb5 | 1430 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1431 | |
1432 | /* We cannot add true routes via loopback here, | |
1433 | they would result in kernel looping; promote them to reject routes | |
1434 | */ | |
86872cb5 | 1435 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1436 | (dev && (dev->flags & IFF_LOOPBACK) && |
1437 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1438 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1439 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1440 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1441 | if (dev) { |
1442 | dev_put(dev); | |
1443 | in6_dev_put(idev); | |
1444 | } | |
5578689a | 1445 | dev = net->loopback_dev; |
1da177e4 LT |
1446 | dev_hold(dev); |
1447 | idev = in6_dev_get(dev); | |
1448 | if (!idev) { | |
1449 | err = -ENODEV; | |
1450 | goto out; | |
1451 | } | |
1452 | } | |
d8d1f30b CG |
1453 | rt->dst.output = ip6_pkt_discard_out; |
1454 | rt->dst.input = ip6_pkt_discard; | |
1455 | rt->dst.error = -ENETUNREACH; | |
1da177e4 LT |
1456 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
1457 | goto install_route; | |
1458 | } | |
1459 | ||
86872cb5 | 1460 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1461 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1462 | int gwa_type; |
1463 | ||
86872cb5 | 1464 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1465 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1466 | gwa_type = ipv6_addr_type(gw_addr); |
1467 | ||
1468 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1469 | struct rt6_info *grt; | |
1470 | ||
1471 | /* IPv6 strictly inhibits using not link-local | |
1472 | addresses as nexthop address. | |
1473 | Otherwise, router will not able to send redirects. | |
1474 | It is very good, but in some (rare!) circumstances | |
1475 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1476 | some exceptions. --ANK | |
1477 | */ | |
1478 | err = -EINVAL; | |
38308473 | 1479 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1480 | goto out; |
1481 | ||
5578689a | 1482 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1483 | |
1484 | err = -EHOSTUNREACH; | |
38308473 | 1485 | if (!grt) |
1da177e4 LT |
1486 | goto out; |
1487 | if (dev) { | |
d1918542 | 1488 | if (dev != grt->dst.dev) { |
d8d1f30b | 1489 | dst_release(&grt->dst); |
1da177e4 LT |
1490 | goto out; |
1491 | } | |
1492 | } else { | |
d1918542 | 1493 | dev = grt->dst.dev; |
1da177e4 LT |
1494 | idev = grt->rt6i_idev; |
1495 | dev_hold(dev); | |
1496 | in6_dev_hold(grt->rt6i_idev); | |
1497 | } | |
38308473 | 1498 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1499 | err = 0; |
d8d1f30b | 1500 | dst_release(&grt->dst); |
1da177e4 LT |
1501 | |
1502 | if (err) | |
1503 | goto out; | |
1504 | } | |
1505 | err = -EINVAL; | |
38308473 | 1506 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1507 | goto out; |
1508 | } | |
1509 | ||
1510 | err = -ENODEV; | |
38308473 | 1511 | if (!dev) |
1da177e4 LT |
1512 | goto out; |
1513 | ||
c3968a85 DW |
1514 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1515 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1516 | err = -EINVAL; | |
1517 | goto out; | |
1518 | } | |
4e3fd7a0 | 1519 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1520 | rt->rt6i_prefsrc.plen = 128; |
1521 | } else | |
1522 | rt->rt6i_prefsrc.plen = 0; | |
1523 | ||
86872cb5 | 1524 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
8ade06c6 | 1525 | err = rt6_bind_neighbour(rt, dev); |
f83c7790 | 1526 | if (err) |
1da177e4 | 1527 | goto out; |
1da177e4 LT |
1528 | } |
1529 | ||
86872cb5 | 1530 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1531 | |
1532 | install_route: | |
86872cb5 TG |
1533 | if (cfg->fc_mx) { |
1534 | struct nlattr *nla; | |
1535 | int remaining; | |
1536 | ||
1537 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1538 | int type = nla_type(nla); |
86872cb5 TG |
1539 | |
1540 | if (type) { | |
1541 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1542 | err = -EINVAL; |
1543 | goto out; | |
1544 | } | |
86872cb5 | 1545 | |
defb3519 | 1546 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1547 | } |
1da177e4 LT |
1548 | } |
1549 | } | |
1550 | ||
d8d1f30b | 1551 | rt->dst.dev = dev; |
1da177e4 | 1552 | rt->rt6i_idev = idev; |
c71099ac | 1553 | rt->rt6i_table = table; |
63152fc0 | 1554 | |
c346dca1 | 1555 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1556 | |
86872cb5 | 1557 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1558 | |
1559 | out: | |
1560 | if (dev) | |
1561 | dev_put(dev); | |
1562 | if (idev) | |
1563 | in6_dev_put(idev); | |
1564 | if (rt) | |
d8d1f30b | 1565 | dst_free(&rt->dst); |
1da177e4 LT |
1566 | return err; |
1567 | } | |
1568 | ||
86872cb5 | 1569 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1570 | { |
1571 | int err; | |
c71099ac | 1572 | struct fib6_table *table; |
d1918542 | 1573 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1574 | |
8ed67789 | 1575 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1576 | return -ENOENT; |
1577 | ||
c71099ac TG |
1578 | table = rt->rt6i_table; |
1579 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1580 | |
86872cb5 | 1581 | err = fib6_del(rt, info); |
d8d1f30b | 1582 | dst_release(&rt->dst); |
1da177e4 | 1583 | |
c71099ac | 1584 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1585 | |
1586 | return err; | |
1587 | } | |
1588 | ||
e0a1ad73 TG |
1589 | int ip6_del_rt(struct rt6_info *rt) |
1590 | { | |
4d1169c1 | 1591 | struct nl_info info = { |
d1918542 | 1592 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1593 | }; |
528c4ceb | 1594 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1595 | } |
1596 | ||
86872cb5 | 1597 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1598 | { |
c71099ac | 1599 | struct fib6_table *table; |
1da177e4 LT |
1600 | struct fib6_node *fn; |
1601 | struct rt6_info *rt; | |
1602 | int err = -ESRCH; | |
1603 | ||
5578689a | 1604 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1605 | if (!table) |
c71099ac TG |
1606 | return err; |
1607 | ||
1608 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1609 | |
c71099ac | 1610 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1611 | &cfg->fc_dst, cfg->fc_dst_len, |
1612 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1613 | |
1da177e4 | 1614 | if (fn) { |
d8d1f30b | 1615 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1616 | if (cfg->fc_ifindex && |
d1918542 DM |
1617 | (!rt->dst.dev || |
1618 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1619 | continue; |
86872cb5 TG |
1620 | if (cfg->fc_flags & RTF_GATEWAY && |
1621 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1622 | continue; |
86872cb5 | 1623 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1624 | continue; |
d8d1f30b | 1625 | dst_hold(&rt->dst); |
c71099ac | 1626 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1627 | |
86872cb5 | 1628 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1629 | } |
1630 | } | |
c71099ac | 1631 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1632 | |
1633 | return err; | |
1634 | } | |
1635 | ||
6e157b6a | 1636 | static void rt6_do_redirect(struct dst_entry *dst, struct sk_buff *skb) |
a6279458 | 1637 | { |
e8599ff4 | 1638 | struct net *net = dev_net(skb->dev); |
a6279458 | 1639 | struct netevent_redirect netevent; |
e8599ff4 DM |
1640 | struct rt6_info *rt, *nrt = NULL; |
1641 | const struct in6_addr *target; | |
e8599ff4 | 1642 | struct ndisc_options ndopts; |
6e157b6a DM |
1643 | const struct in6_addr *dest; |
1644 | struct neighbour *old_neigh; | |
e8599ff4 DM |
1645 | struct inet6_dev *in6_dev; |
1646 | struct neighbour *neigh; | |
1647 | struct icmp6hdr *icmph; | |
6e157b6a DM |
1648 | int optlen, on_link; |
1649 | u8 *lladdr; | |
e8599ff4 DM |
1650 | |
1651 | optlen = skb->tail - skb->transport_header; | |
1652 | optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); | |
1653 | ||
1654 | if (optlen < 0) { | |
6e157b6a | 1655 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
1656 | return; |
1657 | } | |
1658 | ||
1659 | icmph = icmp6_hdr(skb); | |
1660 | target = (const struct in6_addr *) (icmph + 1); | |
1661 | dest = target + 1; | |
1662 | ||
1663 | if (ipv6_addr_is_multicast(dest)) { | |
6e157b6a | 1664 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
1665 | return; |
1666 | } | |
1667 | ||
6e157b6a | 1668 | on_link = 0; |
e8599ff4 DM |
1669 | if (ipv6_addr_equal(dest, target)) { |
1670 | on_link = 1; | |
1671 | } else if (ipv6_addr_type(target) != | |
1672 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { | |
6e157b6a | 1673 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
1674 | return; |
1675 | } | |
1676 | ||
1677 | in6_dev = __in6_dev_get(skb->dev); | |
1678 | if (!in6_dev) | |
1679 | return; | |
1680 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
1681 | return; | |
1682 | ||
1683 | /* RFC2461 8.1: | |
1684 | * The IP source address of the Redirect MUST be the same as the current | |
1685 | * first-hop router for the specified ICMP Destination Address. | |
1686 | */ | |
1687 | ||
1688 | if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) { | |
1689 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); | |
1690 | return; | |
1691 | } | |
6e157b6a DM |
1692 | |
1693 | lladdr = NULL; | |
e8599ff4 DM |
1694 | if (ndopts.nd_opts_tgt_lladdr) { |
1695 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1696 | skb->dev); | |
1697 | if (!lladdr) { | |
1698 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
1699 | return; | |
1700 | } | |
1701 | } | |
1702 | ||
6e157b6a DM |
1703 | rt = (struct rt6_info *) dst; |
1704 | if (rt == net->ipv6.ip6_null_entry) { | |
1705 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); | |
e8599ff4 | 1706 | return; |
6e157b6a | 1707 | } |
e8599ff4 | 1708 | |
6e157b6a DM |
1709 | /* Redirect received -> path was valid. |
1710 | * Look, redirects are sent only in response to data packets, | |
1711 | * so that this nexthop apparently is reachable. --ANK | |
1712 | */ | |
1713 | dst_confirm(&rt->dst); | |
a6279458 | 1714 | |
6e157b6a DM |
1715 | neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1); |
1716 | if (!neigh) | |
1717 | return; | |
a6279458 | 1718 | |
6e157b6a DM |
1719 | /* Duplicate redirect: silently ignore. */ |
1720 | old_neigh = rt->n; | |
1721 | if (neigh == old_neigh) | |
a6279458 | 1722 | goto out; |
1da177e4 | 1723 | |
1da177e4 LT |
1724 | /* |
1725 | * We have finally decided to accept it. | |
1726 | */ | |
1727 | ||
1ab1457c | 1728 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1729 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1730 | NEIGH_UPDATE_F_OVERRIDE| | |
1731 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1732 | NEIGH_UPDATE_F_ISROUTER)) | |
1733 | ); | |
1734 | ||
21efcfa0 | 1735 | nrt = ip6_rt_copy(rt, dest); |
38308473 | 1736 | if (!nrt) |
1da177e4 LT |
1737 | goto out; |
1738 | ||
1739 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1740 | if (on_link) | |
1741 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1742 | ||
4e3fd7a0 | 1743 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
97cac082 | 1744 | nrt->n = neigh_clone(neigh); |
1da177e4 | 1745 | |
40e22e8f | 1746 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1747 | goto out; |
1748 | ||
d8d1f30b | 1749 | netevent.old = &rt->dst; |
1d248b1c | 1750 | netevent.old_neigh = old_neigh; |
d8d1f30b | 1751 | netevent.new = &nrt->dst; |
1d248b1c DM |
1752 | netevent.new_neigh = neigh; |
1753 | netevent.daddr = dest; | |
8d71740c TT |
1754 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1755 | ||
38308473 | 1756 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 1757 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 1758 | ip6_del_rt(rt); |
1da177e4 LT |
1759 | } |
1760 | ||
1761 | out: | |
e8599ff4 | 1762 | neigh_release(neigh); |
6e157b6a DM |
1763 | } |
1764 | ||
1da177e4 LT |
1765 | /* |
1766 | * Misc support functions | |
1767 | */ | |
1768 | ||
1716a961 | 1769 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 1770 | const struct in6_addr *dest) |
1da177e4 | 1771 | { |
d1918542 | 1772 | struct net *net = dev_net(ort->dst.dev); |
8b96d22d DM |
1773 | struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0, |
1774 | ort->rt6i_table); | |
1da177e4 LT |
1775 | |
1776 | if (rt) { | |
d8d1f30b CG |
1777 | rt->dst.input = ort->dst.input; |
1778 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1779 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1780 | |
4e3fd7a0 | 1781 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1782 | rt->rt6i_dst.plen = 128; |
defb3519 | 1783 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1784 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1785 | rt->rt6i_idev = ort->rt6i_idev; |
1786 | if (rt->rt6i_idev) | |
1787 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1788 | rt->dst.lastuse = jiffies; |
1da177e4 | 1789 | |
4e3fd7a0 | 1790 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
1791 | rt->rt6i_flags = ort->rt6i_flags; |
1792 | if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) == | |
1793 | (RTF_DEFAULT | RTF_ADDRCONF)) | |
1794 | rt6_set_from(rt, ort); | |
1795 | else | |
1796 | rt6_clean_expires(rt); | |
1da177e4 LT |
1797 | rt->rt6i_metric = 0; |
1798 | ||
1da177e4 LT |
1799 | #ifdef CONFIG_IPV6_SUBTREES |
1800 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1801 | #endif | |
0f6c6392 | 1802 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1803 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1804 | } |
1805 | return rt; | |
1806 | } | |
1807 | ||
70ceb4f5 | 1808 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1809 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1810 | const struct in6_addr *prefix, int prefixlen, |
1811 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1812 | { |
1813 | struct fib6_node *fn; | |
1814 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1815 | struct fib6_table *table; |
1816 | ||
efa2cea0 | 1817 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 1818 | if (!table) |
c71099ac | 1819 | return NULL; |
70ceb4f5 | 1820 | |
c71099ac TG |
1821 | write_lock_bh(&table->tb6_lock); |
1822 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1823 | if (!fn) |
1824 | goto out; | |
1825 | ||
d8d1f30b | 1826 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 1827 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
1828 | continue; |
1829 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1830 | continue; | |
1831 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1832 | continue; | |
d8d1f30b | 1833 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1834 | break; |
1835 | } | |
1836 | out: | |
c71099ac | 1837 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1838 | return rt; |
1839 | } | |
1840 | ||
efa2cea0 | 1841 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
1842 | const struct in6_addr *prefix, int prefixlen, |
1843 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 1844 | unsigned int pref) |
70ceb4f5 | 1845 | { |
86872cb5 TG |
1846 | struct fib6_config cfg = { |
1847 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1848 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1849 | .fc_ifindex = ifindex, |
1850 | .fc_dst_len = prefixlen, | |
1851 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1852 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1853 | .fc_nlinfo.pid = 0, |
1854 | .fc_nlinfo.nlh = NULL, | |
1855 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1856 | }; |
1857 | ||
4e3fd7a0 AD |
1858 | cfg.fc_dst = *prefix; |
1859 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 1860 | |
e317da96 YH |
1861 | /* We should treat it as a default route if prefix length is 0. */ |
1862 | if (!prefixlen) | |
86872cb5 | 1863 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1864 | |
86872cb5 | 1865 | ip6_route_add(&cfg); |
70ceb4f5 | 1866 | |
efa2cea0 | 1867 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1868 | } |
1869 | #endif | |
1870 | ||
b71d1d42 | 1871 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1872 | { |
1da177e4 | 1873 | struct rt6_info *rt; |
c71099ac | 1874 | struct fib6_table *table; |
1da177e4 | 1875 | |
c346dca1 | 1876 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 1877 | if (!table) |
c71099ac | 1878 | return NULL; |
1da177e4 | 1879 | |
c71099ac | 1880 | write_lock_bh(&table->tb6_lock); |
d8d1f30b | 1881 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
d1918542 | 1882 | if (dev == rt->dst.dev && |
045927ff | 1883 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1884 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1885 | break; | |
1886 | } | |
1887 | if (rt) | |
d8d1f30b | 1888 | dst_hold(&rt->dst); |
c71099ac | 1889 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1890 | return rt; |
1891 | } | |
1892 | ||
b71d1d42 | 1893 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
1894 | struct net_device *dev, |
1895 | unsigned int pref) | |
1da177e4 | 1896 | { |
86872cb5 TG |
1897 | struct fib6_config cfg = { |
1898 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1899 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1900 | .fc_ifindex = dev->ifindex, |
1901 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1902 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1903 | .fc_nlinfo.pid = 0, |
1904 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1905 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1906 | }; |
1da177e4 | 1907 | |
4e3fd7a0 | 1908 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 1909 | |
86872cb5 | 1910 | ip6_route_add(&cfg); |
1da177e4 | 1911 | |
1da177e4 LT |
1912 | return rt6_get_dflt_router(gwaddr, dev); |
1913 | } | |
1914 | ||
7b4da532 | 1915 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1916 | { |
1917 | struct rt6_info *rt; | |
c71099ac TG |
1918 | struct fib6_table *table; |
1919 | ||
1920 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1921 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 1922 | if (!table) |
c71099ac | 1923 | return; |
1da177e4 LT |
1924 | |
1925 | restart: | |
c71099ac | 1926 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1927 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1928 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1929 | dst_hold(&rt->dst); |
c71099ac | 1930 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1931 | ip6_del_rt(rt); |
1da177e4 LT |
1932 | goto restart; |
1933 | } | |
1934 | } | |
c71099ac | 1935 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1936 | } |
1937 | ||
5578689a DL |
1938 | static void rtmsg_to_fib6_config(struct net *net, |
1939 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1940 | struct fib6_config *cfg) |
1941 | { | |
1942 | memset(cfg, 0, sizeof(*cfg)); | |
1943 | ||
1944 | cfg->fc_table = RT6_TABLE_MAIN; | |
1945 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1946 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1947 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1948 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1949 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1950 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1951 | ||
5578689a | 1952 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1953 | |
4e3fd7a0 AD |
1954 | cfg->fc_dst = rtmsg->rtmsg_dst; |
1955 | cfg->fc_src = rtmsg->rtmsg_src; | |
1956 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
1957 | } |
1958 | ||
5578689a | 1959 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1960 | { |
86872cb5 | 1961 | struct fib6_config cfg; |
1da177e4 LT |
1962 | struct in6_rtmsg rtmsg; |
1963 | int err; | |
1964 | ||
1965 | switch(cmd) { | |
1966 | case SIOCADDRT: /* Add a route */ | |
1967 | case SIOCDELRT: /* Delete a route */ | |
1968 | if (!capable(CAP_NET_ADMIN)) | |
1969 | return -EPERM; | |
1970 | err = copy_from_user(&rtmsg, arg, | |
1971 | sizeof(struct in6_rtmsg)); | |
1972 | if (err) | |
1973 | return -EFAULT; | |
86872cb5 | 1974 | |
5578689a | 1975 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1976 | |
1da177e4 LT |
1977 | rtnl_lock(); |
1978 | switch (cmd) { | |
1979 | case SIOCADDRT: | |
86872cb5 | 1980 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1981 | break; |
1982 | case SIOCDELRT: | |
86872cb5 | 1983 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1984 | break; |
1985 | default: | |
1986 | err = -EINVAL; | |
1987 | } | |
1988 | rtnl_unlock(); | |
1989 | ||
1990 | return err; | |
3ff50b79 | 1991 | } |
1da177e4 LT |
1992 | |
1993 | return -EINVAL; | |
1994 | } | |
1995 | ||
1996 | /* | |
1997 | * Drop the packet on the floor | |
1998 | */ | |
1999 | ||
d5fdd6ba | 2000 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2001 | { |
612f09e8 | 2002 | int type; |
adf30907 | 2003 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2004 | switch (ipstats_mib_noroutes) { |
2005 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2006 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2007 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2008 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2009 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2010 | break; |
2011 | } | |
2012 | /* FALLTHROUGH */ | |
2013 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2014 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2015 | ipstats_mib_noroutes); | |
612f09e8 YH |
2016 | break; |
2017 | } | |
3ffe533c | 2018 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2019 | kfree_skb(skb); |
2020 | return 0; | |
2021 | } | |
2022 | ||
9ce8ade0 TG |
2023 | static int ip6_pkt_discard(struct sk_buff *skb) |
2024 | { | |
612f09e8 | 2025 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2026 | } |
2027 | ||
20380731 | 2028 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 2029 | { |
adf30907 | 2030 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2031 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2032 | } |
2033 | ||
6723ab54 DM |
2034 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2035 | ||
9ce8ade0 TG |
2036 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2037 | { | |
612f09e8 | 2038 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2039 | } |
2040 | ||
2041 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
2042 | { | |
adf30907 | 2043 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2044 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2045 | } |
2046 | ||
6723ab54 DM |
2047 | #endif |
2048 | ||
1da177e4 LT |
2049 | /* |
2050 | * Allocate a dst for local (unicast / anycast) address. | |
2051 | */ | |
2052 | ||
2053 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2054 | const struct in6_addr *addr, | |
8f031519 | 2055 | bool anycast) |
1da177e4 | 2056 | { |
c346dca1 | 2057 | struct net *net = dev_net(idev->dev); |
8b96d22d | 2058 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL); |
f83c7790 | 2059 | int err; |
1da177e4 | 2060 | |
38308473 | 2061 | if (!rt) { |
f3213831 | 2062 | net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n"); |
1da177e4 | 2063 | return ERR_PTR(-ENOMEM); |
40385653 | 2064 | } |
1da177e4 | 2065 | |
1da177e4 LT |
2066 | in6_dev_hold(idev); |
2067 | ||
11d53b49 | 2068 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2069 | rt->dst.input = ip6_input; |
2070 | rt->dst.output = ip6_output; | |
1da177e4 | 2071 | rt->rt6i_idev = idev; |
d8d1f30b | 2072 | rt->dst.obsolete = -1; |
1da177e4 LT |
2073 | |
2074 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2075 | if (anycast) |
2076 | rt->rt6i_flags |= RTF_ANYCAST; | |
2077 | else | |
1da177e4 | 2078 | rt->rt6i_flags |= RTF_LOCAL; |
8ade06c6 | 2079 | err = rt6_bind_neighbour(rt, rt->dst.dev); |
f83c7790 | 2080 | if (err) { |
d8d1f30b | 2081 | dst_free(&rt->dst); |
f83c7790 | 2082 | return ERR_PTR(err); |
1da177e4 LT |
2083 | } |
2084 | ||
4e3fd7a0 | 2085 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2086 | rt->rt6i_dst.plen = 128; |
5578689a | 2087 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2088 | |
d8d1f30b | 2089 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2090 | |
2091 | return rt; | |
2092 | } | |
2093 | ||
c3968a85 DW |
2094 | int ip6_route_get_saddr(struct net *net, |
2095 | struct rt6_info *rt, | |
b71d1d42 | 2096 | const struct in6_addr *daddr, |
c3968a85 DW |
2097 | unsigned int prefs, |
2098 | struct in6_addr *saddr) | |
2099 | { | |
2100 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2101 | int err = 0; | |
2102 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2103 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2104 | else |
2105 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2106 | daddr, prefs, saddr); | |
2107 | return err; | |
2108 | } | |
2109 | ||
2110 | /* remove deleted ip from prefsrc entries */ | |
2111 | struct arg_dev_net_ip { | |
2112 | struct net_device *dev; | |
2113 | struct net *net; | |
2114 | struct in6_addr *addr; | |
2115 | }; | |
2116 | ||
2117 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2118 | { | |
2119 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2120 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2121 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2122 | ||
d1918542 | 2123 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2124 | rt != net->ipv6.ip6_null_entry && |
2125 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2126 | /* remove prefsrc entry */ | |
2127 | rt->rt6i_prefsrc.plen = 0; | |
2128 | } | |
2129 | return 0; | |
2130 | } | |
2131 | ||
2132 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2133 | { | |
2134 | struct net *net = dev_net(ifp->idev->dev); | |
2135 | struct arg_dev_net_ip adni = { | |
2136 | .dev = ifp->idev->dev, | |
2137 | .net = net, | |
2138 | .addr = &ifp->addr, | |
2139 | }; | |
2140 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); | |
2141 | } | |
2142 | ||
8ed67789 DL |
2143 | struct arg_dev_net { |
2144 | struct net_device *dev; | |
2145 | struct net *net; | |
2146 | }; | |
2147 | ||
1da177e4 LT |
2148 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2149 | { | |
bc3ef660 | 2150 | const struct arg_dev_net *adn = arg; |
2151 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2152 | |
d1918542 | 2153 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2154 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2155 | return -1; |
c159d30c | 2156 | |
1da177e4 LT |
2157 | return 0; |
2158 | } | |
2159 | ||
f3db4851 | 2160 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2161 | { |
8ed67789 DL |
2162 | struct arg_dev_net adn = { |
2163 | .dev = dev, | |
2164 | .net = net, | |
2165 | }; | |
2166 | ||
2167 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2168 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2169 | } |
2170 | ||
95c96174 | 2171 | struct rt6_mtu_change_arg { |
1da177e4 | 2172 | struct net_device *dev; |
95c96174 | 2173 | unsigned int mtu; |
1da177e4 LT |
2174 | }; |
2175 | ||
2176 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2177 | { | |
2178 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2179 | struct inet6_dev *idev; | |
2180 | ||
2181 | /* In IPv6 pmtu discovery is not optional, | |
2182 | so that RTAX_MTU lock cannot disable it. | |
2183 | We still use this lock to block changes | |
2184 | caused by addrconf/ndisc. | |
2185 | */ | |
2186 | ||
2187 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2188 | if (!idev) |
1da177e4 LT |
2189 | return 0; |
2190 | ||
2191 | /* For administrative MTU increase, there is no way to discover | |
2192 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2193 | Since RFC 1981 doesn't include administrative MTU increase | |
2194 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2195 | */ | |
2196 | /* | |
2197 | If new MTU is less than route PMTU, this new MTU will be the | |
2198 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2199 | decreases; if new MTU is greater than route PMTU, and the | |
2200 | old MTU is the lowest MTU in the path, update the route PMTU | |
2201 | to reflect the increase. In this case if the other nodes' MTU | |
2202 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2203 | PMTU discouvery. | |
2204 | */ | |
d1918542 | 2205 | if (rt->dst.dev == arg->dev && |
d8d1f30b CG |
2206 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2207 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2208 | (dst_mtu(&rt->dst) < arg->mtu && | |
2209 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2210 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2211 | } |
1da177e4 LT |
2212 | return 0; |
2213 | } | |
2214 | ||
95c96174 | 2215 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2216 | { |
c71099ac TG |
2217 | struct rt6_mtu_change_arg arg = { |
2218 | .dev = dev, | |
2219 | .mtu = mtu, | |
2220 | }; | |
1da177e4 | 2221 | |
c346dca1 | 2222 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2223 | } |
2224 | ||
ef7c79ed | 2225 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2226 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2227 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2228 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2229 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2230 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2231 | }; | |
2232 | ||
2233 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2234 | struct fib6_config *cfg) | |
1da177e4 | 2235 | { |
86872cb5 TG |
2236 | struct rtmsg *rtm; |
2237 | struct nlattr *tb[RTA_MAX+1]; | |
2238 | int err; | |
1da177e4 | 2239 | |
86872cb5 TG |
2240 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2241 | if (err < 0) | |
2242 | goto errout; | |
1da177e4 | 2243 | |
86872cb5 TG |
2244 | err = -EINVAL; |
2245 | rtm = nlmsg_data(nlh); | |
2246 | memset(cfg, 0, sizeof(*cfg)); | |
2247 | ||
2248 | cfg->fc_table = rtm->rtm_table; | |
2249 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2250 | cfg->fc_src_len = rtm->rtm_src_len; | |
2251 | cfg->fc_flags = RTF_UP; | |
2252 | cfg->fc_protocol = rtm->rtm_protocol; | |
2253 | ||
2254 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2255 | cfg->fc_flags |= RTF_REJECT; | |
2256 | ||
ab79ad14 MŻ |
2257 | if (rtm->rtm_type == RTN_LOCAL) |
2258 | cfg->fc_flags |= RTF_LOCAL; | |
2259 | ||
86872cb5 TG |
2260 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
2261 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2262 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2263 | |
2264 | if (tb[RTA_GATEWAY]) { | |
2265 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2266 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2267 | } |
86872cb5 TG |
2268 | |
2269 | if (tb[RTA_DST]) { | |
2270 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2271 | ||
2272 | if (nla_len(tb[RTA_DST]) < plen) | |
2273 | goto errout; | |
2274 | ||
2275 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2276 | } |
86872cb5 TG |
2277 | |
2278 | if (tb[RTA_SRC]) { | |
2279 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2280 | ||
2281 | if (nla_len(tb[RTA_SRC]) < plen) | |
2282 | goto errout; | |
2283 | ||
2284 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2285 | } |
86872cb5 | 2286 | |
c3968a85 DW |
2287 | if (tb[RTA_PREFSRC]) |
2288 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2289 | ||
86872cb5 TG |
2290 | if (tb[RTA_OIF]) |
2291 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2292 | ||
2293 | if (tb[RTA_PRIORITY]) | |
2294 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2295 | ||
2296 | if (tb[RTA_METRICS]) { | |
2297 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2298 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2299 | } |
86872cb5 TG |
2300 | |
2301 | if (tb[RTA_TABLE]) | |
2302 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2303 | ||
2304 | err = 0; | |
2305 | errout: | |
2306 | return err; | |
1da177e4 LT |
2307 | } |
2308 | ||
c127ea2c | 2309 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2310 | { |
86872cb5 TG |
2311 | struct fib6_config cfg; |
2312 | int err; | |
1da177e4 | 2313 | |
86872cb5 TG |
2314 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2315 | if (err < 0) | |
2316 | return err; | |
2317 | ||
2318 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2319 | } |
2320 | ||
c127ea2c | 2321 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2322 | { |
86872cb5 TG |
2323 | struct fib6_config cfg; |
2324 | int err; | |
1da177e4 | 2325 | |
86872cb5 TG |
2326 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2327 | if (err < 0) | |
2328 | return err; | |
2329 | ||
2330 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2331 | } |
2332 | ||
339bf98f TG |
2333 | static inline size_t rt6_nlmsg_size(void) |
2334 | { | |
2335 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2336 | + nla_total_size(16) /* RTA_SRC */ | |
2337 | + nla_total_size(16) /* RTA_DST */ | |
2338 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2339 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2340 | + nla_total_size(4) /* RTA_TABLE */ | |
2341 | + nla_total_size(4) /* RTA_IIF */ | |
2342 | + nla_total_size(4) /* RTA_OIF */ | |
2343 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2344 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2345 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2346 | } | |
2347 | ||
191cd582 BH |
2348 | static int rt6_fill_node(struct net *net, |
2349 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2350 | struct in6_addr *dst, struct in6_addr *src, |
2351 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2352 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2353 | { |
2354 | struct rtmsg *rtm; | |
2d7202bf | 2355 | struct nlmsghdr *nlh; |
e3703b3d | 2356 | long expires; |
9e762a4a | 2357 | u32 table; |
f2c31e32 | 2358 | struct neighbour *n; |
1da177e4 LT |
2359 | |
2360 | if (prefix) { /* user wants prefix routes only */ | |
2361 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2362 | /* success since this is not a prefix route */ | |
2363 | return 1; | |
2364 | } | |
2365 | } | |
2366 | ||
2d7202bf | 2367 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
38308473 | 2368 | if (!nlh) |
26932566 | 2369 | return -EMSGSIZE; |
2d7202bf TG |
2370 | |
2371 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2372 | rtm->rtm_family = AF_INET6; |
2373 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2374 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2375 | rtm->rtm_tos = 0; | |
c71099ac | 2376 | if (rt->rt6i_table) |
9e762a4a | 2377 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2378 | else |
9e762a4a PM |
2379 | table = RT6_TABLE_UNSPEC; |
2380 | rtm->rtm_table = table; | |
c78679e8 DM |
2381 | if (nla_put_u32(skb, RTA_TABLE, table)) |
2382 | goto nla_put_failure; | |
38308473 | 2383 | if (rt->rt6i_flags & RTF_REJECT) |
1da177e4 | 2384 | rtm->rtm_type = RTN_UNREACHABLE; |
38308473 | 2385 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2386 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2387 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2388 | rtm->rtm_type = RTN_LOCAL; |
2389 | else | |
2390 | rtm->rtm_type = RTN_UNICAST; | |
2391 | rtm->rtm_flags = 0; | |
2392 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2393 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2394 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 LT |
2395 | rtm->rtm_protocol = RTPROT_REDIRECT; |
2396 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2397 | rtm->rtm_protocol = RTPROT_KERNEL; | |
38308473 | 2398 | else if (rt->rt6i_flags & RTF_DEFAULT) |
1da177e4 LT |
2399 | rtm->rtm_protocol = RTPROT_RA; |
2400 | ||
38308473 | 2401 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2402 | rtm->rtm_flags |= RTM_F_CLONED; |
2403 | ||
2404 | if (dst) { | |
c78679e8 DM |
2405 | if (nla_put(skb, RTA_DST, 16, dst)) |
2406 | goto nla_put_failure; | |
1ab1457c | 2407 | rtm->rtm_dst_len = 128; |
1da177e4 | 2408 | } else if (rtm->rtm_dst_len) |
c78679e8 DM |
2409 | if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) |
2410 | goto nla_put_failure; | |
1da177e4 LT |
2411 | #ifdef CONFIG_IPV6_SUBTREES |
2412 | if (src) { | |
c78679e8 DM |
2413 | if (nla_put(skb, RTA_SRC, 16, src)) |
2414 | goto nla_put_failure; | |
1ab1457c | 2415 | rtm->rtm_src_len = 128; |
c78679e8 DM |
2416 | } else if (rtm->rtm_src_len && |
2417 | nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) | |
2418 | goto nla_put_failure; | |
1da177e4 | 2419 | #endif |
7bc570c8 YH |
2420 | if (iif) { |
2421 | #ifdef CONFIG_IPV6_MROUTE | |
2422 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2423 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2424 | if (err <= 0) { |
2425 | if (!nowait) { | |
2426 | if (err == 0) | |
2427 | return 0; | |
2428 | goto nla_put_failure; | |
2429 | } else { | |
2430 | if (err == -EMSGSIZE) | |
2431 | goto nla_put_failure; | |
2432 | } | |
2433 | } | |
2434 | } else | |
2435 | #endif | |
c78679e8 DM |
2436 | if (nla_put_u32(skb, RTA_IIF, iif)) |
2437 | goto nla_put_failure; | |
7bc570c8 | 2438 | } else if (dst) { |
1da177e4 | 2439 | struct in6_addr saddr_buf; |
c78679e8 DM |
2440 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
2441 | nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) | |
2442 | goto nla_put_failure; | |
1da177e4 | 2443 | } |
2d7202bf | 2444 | |
c3968a85 DW |
2445 | if (rt->rt6i_prefsrc.plen) { |
2446 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2447 | saddr_buf = rt->rt6i_prefsrc.addr; |
c78679e8 DM |
2448 | if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
2449 | goto nla_put_failure; | |
c3968a85 DW |
2450 | } |
2451 | ||
defb3519 | 2452 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2453 | goto nla_put_failure; |
2454 | ||
f2c31e32 | 2455 | rcu_read_lock(); |
97cac082 | 2456 | n = rt->n; |
94f826b8 ED |
2457 | if (n) { |
2458 | if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) { | |
2459 | rcu_read_unlock(); | |
2460 | goto nla_put_failure; | |
2461 | } | |
2462 | } | |
f2c31e32 | 2463 | rcu_read_unlock(); |
2d7202bf | 2464 | |
c78679e8 DM |
2465 | if (rt->dst.dev && |
2466 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2467 | goto nla_put_failure; | |
2468 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
2469 | goto nla_put_failure; | |
36e3deae YH |
2470 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2471 | expires = 0; | |
d1918542 DM |
2472 | else if (rt->dst.expires - jiffies < INT_MAX) |
2473 | expires = rt->dst.expires - jiffies; | |
36e3deae YH |
2474 | else |
2475 | expires = INT_MAX; | |
69cdf8f9 | 2476 | |
87a50699 | 2477 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 2478 | goto nla_put_failure; |
2d7202bf TG |
2479 | |
2480 | return nlmsg_end(skb, nlh); | |
2481 | ||
2482 | nla_put_failure: | |
26932566 PM |
2483 | nlmsg_cancel(skb, nlh); |
2484 | return -EMSGSIZE; | |
1da177e4 LT |
2485 | } |
2486 | ||
1b43af54 | 2487 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2488 | { |
2489 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2490 | int prefix; | |
2491 | ||
2d7202bf TG |
2492 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2493 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2494 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2495 | } else | |
2496 | prefix = 0; | |
2497 | ||
191cd582 BH |
2498 | return rt6_fill_node(arg->net, |
2499 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2500 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2501 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2502 | } |
2503 | ||
c127ea2c | 2504 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2505 | { |
3b1e0a65 | 2506 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2507 | struct nlattr *tb[RTA_MAX+1]; |
2508 | struct rt6_info *rt; | |
1da177e4 | 2509 | struct sk_buff *skb; |
ab364a6f | 2510 | struct rtmsg *rtm; |
4c9483b2 | 2511 | struct flowi6 fl6; |
72331bc0 | 2512 | int err, iif = 0, oif = 0; |
1da177e4 | 2513 | |
ab364a6f TG |
2514 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2515 | if (err < 0) | |
2516 | goto errout; | |
1da177e4 | 2517 | |
ab364a6f | 2518 | err = -EINVAL; |
4c9483b2 | 2519 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2520 | |
ab364a6f TG |
2521 | if (tb[RTA_SRC]) { |
2522 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2523 | goto errout; | |
2524 | ||
4e3fd7a0 | 2525 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2526 | } |
2527 | ||
2528 | if (tb[RTA_DST]) { | |
2529 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2530 | goto errout; | |
2531 | ||
4e3fd7a0 | 2532 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2533 | } |
2534 | ||
2535 | if (tb[RTA_IIF]) | |
2536 | iif = nla_get_u32(tb[RTA_IIF]); | |
2537 | ||
2538 | if (tb[RTA_OIF]) | |
72331bc0 | 2539 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 LT |
2540 | |
2541 | if (iif) { | |
2542 | struct net_device *dev; | |
72331bc0 SL |
2543 | int flags = 0; |
2544 | ||
5578689a | 2545 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2546 | if (!dev) { |
2547 | err = -ENODEV; | |
ab364a6f | 2548 | goto errout; |
1da177e4 | 2549 | } |
72331bc0 SL |
2550 | |
2551 | fl6.flowi6_iif = iif; | |
2552 | ||
2553 | if (!ipv6_addr_any(&fl6.saddr)) | |
2554 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2555 | ||
2556 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
2557 | flags); | |
2558 | } else { | |
2559 | fl6.flowi6_oif = oif; | |
2560 | ||
2561 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
2562 | } |
2563 | ||
ab364a6f | 2564 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2565 | if (!skb) { |
2173bff5 | 2566 | dst_release(&rt->dst); |
ab364a6f TG |
2567 | err = -ENOBUFS; |
2568 | goto errout; | |
2569 | } | |
1da177e4 | 2570 | |
ab364a6f TG |
2571 | /* Reserve room for dummy headers, this skb can pass |
2572 | through good chunk of routing engine. | |
2573 | */ | |
459a98ed | 2574 | skb_reset_mac_header(skb); |
ab364a6f | 2575 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2576 | |
d8d1f30b | 2577 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2578 | |
4c9483b2 | 2579 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
1da177e4 | 2580 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2581 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2582 | if (err < 0) { |
ab364a6f TG |
2583 | kfree_skb(skb); |
2584 | goto errout; | |
1da177e4 LT |
2585 | } |
2586 | ||
5578689a | 2587 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2588 | errout: |
1da177e4 | 2589 | return err; |
1da177e4 LT |
2590 | } |
2591 | ||
86872cb5 | 2592 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2593 | { |
2594 | struct sk_buff *skb; | |
5578689a | 2595 | struct net *net = info->nl_net; |
528c4ceb DL |
2596 | u32 seq; |
2597 | int err; | |
2598 | ||
2599 | err = -ENOBUFS; | |
38308473 | 2600 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2601 | |
339bf98f | 2602 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2603 | if (!skb) |
21713ebc TG |
2604 | goto errout; |
2605 | ||
191cd582 | 2606 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2607 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2608 | if (err < 0) { |
2609 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2610 | WARN_ON(err == -EMSGSIZE); | |
2611 | kfree_skb(skb); | |
2612 | goto errout; | |
2613 | } | |
1ce85fe4 PNA |
2614 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2615 | info->nlh, gfp_any()); | |
2616 | return; | |
21713ebc TG |
2617 | errout: |
2618 | if (err < 0) | |
5578689a | 2619 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2620 | } |
2621 | ||
8ed67789 DL |
2622 | static int ip6_route_dev_notify(struct notifier_block *this, |
2623 | unsigned long event, void *data) | |
2624 | { | |
2625 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2626 | struct net *net = dev_net(dev); |
8ed67789 DL |
2627 | |
2628 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2629 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2630 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2631 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2632 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2633 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2634 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2635 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2636 | #endif | |
2637 | } | |
2638 | ||
2639 | return NOTIFY_OK; | |
2640 | } | |
2641 | ||
1da177e4 LT |
2642 | /* |
2643 | * /proc | |
2644 | */ | |
2645 | ||
2646 | #ifdef CONFIG_PROC_FS | |
2647 | ||
1da177e4 LT |
2648 | struct rt6_proc_arg |
2649 | { | |
2650 | char *buffer; | |
2651 | int offset; | |
2652 | int length; | |
2653 | int skip; | |
2654 | int len; | |
2655 | }; | |
2656 | ||
2657 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2658 | { | |
33120b30 | 2659 | struct seq_file *m = p_arg; |
69cce1d1 | 2660 | struct neighbour *n; |
1da177e4 | 2661 | |
4b7a4274 | 2662 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2663 | |
2664 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2665 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2666 | #else |
33120b30 | 2667 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 | 2668 | #endif |
f2c31e32 | 2669 | rcu_read_lock(); |
97cac082 | 2670 | n = rt->n; |
69cce1d1 DM |
2671 | if (n) { |
2672 | seq_printf(m, "%pi6", n->primary_key); | |
1da177e4 | 2673 | } else { |
33120b30 | 2674 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2675 | } |
f2c31e32 | 2676 | rcu_read_unlock(); |
33120b30 | 2677 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2678 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2679 | rt->dst.__use, rt->rt6i_flags, | |
d1918542 | 2680 | rt->dst.dev ? rt->dst.dev->name : ""); |
1da177e4 LT |
2681 | return 0; |
2682 | } | |
2683 | ||
33120b30 | 2684 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2685 | { |
f3db4851 | 2686 | struct net *net = (struct net *)m->private; |
32b293a5 | 2687 | fib6_clean_all_ro(net, rt6_info_route, 0, m); |
33120b30 AD |
2688 | return 0; |
2689 | } | |
1da177e4 | 2690 | |
33120b30 AD |
2691 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2692 | { | |
de05c557 | 2693 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2694 | } |
2695 | ||
33120b30 AD |
2696 | static const struct file_operations ipv6_route_proc_fops = { |
2697 | .owner = THIS_MODULE, | |
2698 | .open = ipv6_route_open, | |
2699 | .read = seq_read, | |
2700 | .llseek = seq_lseek, | |
b6fcbdb4 | 2701 | .release = single_release_net, |
33120b30 AD |
2702 | }; |
2703 | ||
1da177e4 LT |
2704 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2705 | { | |
69ddb805 | 2706 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2707 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2708 | net->ipv6.rt6_stats->fib_nodes, |
2709 | net->ipv6.rt6_stats->fib_route_nodes, | |
2710 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2711 | net->ipv6.rt6_stats->fib_rt_entries, | |
2712 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2713 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2714 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2715 | |
2716 | return 0; | |
2717 | } | |
2718 | ||
2719 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2720 | { | |
de05c557 | 2721 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2722 | } |
2723 | ||
9a32144e | 2724 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2725 | .owner = THIS_MODULE, |
2726 | .open = rt6_stats_seq_open, | |
2727 | .read = seq_read, | |
2728 | .llseek = seq_lseek, | |
b6fcbdb4 | 2729 | .release = single_release_net, |
1da177e4 LT |
2730 | }; |
2731 | #endif /* CONFIG_PROC_FS */ | |
2732 | ||
2733 | #ifdef CONFIG_SYSCTL | |
2734 | ||
1da177e4 | 2735 | static |
8d65af78 | 2736 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2737 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2738 | { | |
c486da34 LAG |
2739 | struct net *net; |
2740 | int delay; | |
2741 | if (!write) | |
1da177e4 | 2742 | return -EINVAL; |
c486da34 LAG |
2743 | |
2744 | net = (struct net *)ctl->extra1; | |
2745 | delay = net->ipv6.sysctl.flush_delay; | |
2746 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2747 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); | |
2748 | return 0; | |
1da177e4 LT |
2749 | } |
2750 | ||
760f2d01 | 2751 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2752 | { |
1da177e4 | 2753 | .procname = "flush", |
4990509f | 2754 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2755 | .maxlen = sizeof(int), |
89c8b3a1 | 2756 | .mode = 0200, |
6d9f239a | 2757 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2758 | }, |
2759 | { | |
1da177e4 | 2760 | .procname = "gc_thresh", |
9a7ec3a9 | 2761 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2762 | .maxlen = sizeof(int), |
2763 | .mode = 0644, | |
6d9f239a | 2764 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2765 | }, |
2766 | { | |
1da177e4 | 2767 | .procname = "max_size", |
4990509f | 2768 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2769 | .maxlen = sizeof(int), |
2770 | .mode = 0644, | |
6d9f239a | 2771 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2772 | }, |
2773 | { | |
1da177e4 | 2774 | .procname = "gc_min_interval", |
4990509f | 2775 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2776 | .maxlen = sizeof(int), |
2777 | .mode = 0644, | |
6d9f239a | 2778 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2779 | }, |
2780 | { | |
1da177e4 | 2781 | .procname = "gc_timeout", |
4990509f | 2782 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2783 | .maxlen = sizeof(int), |
2784 | .mode = 0644, | |
6d9f239a | 2785 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2786 | }, |
2787 | { | |
1da177e4 | 2788 | .procname = "gc_interval", |
4990509f | 2789 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2790 | .maxlen = sizeof(int), |
2791 | .mode = 0644, | |
6d9f239a | 2792 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2793 | }, |
2794 | { | |
1da177e4 | 2795 | .procname = "gc_elasticity", |
4990509f | 2796 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2797 | .maxlen = sizeof(int), |
2798 | .mode = 0644, | |
f3d3f616 | 2799 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2800 | }, |
2801 | { | |
1da177e4 | 2802 | .procname = "mtu_expires", |
4990509f | 2803 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2804 | .maxlen = sizeof(int), |
2805 | .mode = 0644, | |
6d9f239a | 2806 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2807 | }, |
2808 | { | |
1da177e4 | 2809 | .procname = "min_adv_mss", |
4990509f | 2810 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2811 | .maxlen = sizeof(int), |
2812 | .mode = 0644, | |
f3d3f616 | 2813 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2814 | }, |
2815 | { | |
1da177e4 | 2816 | .procname = "gc_min_interval_ms", |
4990509f | 2817 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2818 | .maxlen = sizeof(int), |
2819 | .mode = 0644, | |
6d9f239a | 2820 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2821 | }, |
f8572d8f | 2822 | { } |
1da177e4 LT |
2823 | }; |
2824 | ||
2c8c1e72 | 2825 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2826 | { |
2827 | struct ctl_table *table; | |
2828 | ||
2829 | table = kmemdup(ipv6_route_table_template, | |
2830 | sizeof(ipv6_route_table_template), | |
2831 | GFP_KERNEL); | |
5ee09105 YH |
2832 | |
2833 | if (table) { | |
2834 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2835 | table[0].extra1 = net; |
86393e52 | 2836 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2837 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2838 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2839 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2840 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2841 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2842 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2843 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2844 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2845 | } |
2846 | ||
760f2d01 DL |
2847 | return table; |
2848 | } | |
1da177e4 LT |
2849 | #endif |
2850 | ||
2c8c1e72 | 2851 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2852 | { |
633d424b | 2853 | int ret = -ENOMEM; |
8ed67789 | 2854 | |
86393e52 AD |
2855 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2856 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2857 | |
fc66f95c ED |
2858 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2859 | goto out_ip6_dst_ops; | |
2860 | ||
8ed67789 DL |
2861 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2862 | sizeof(*net->ipv6.ip6_null_entry), | |
2863 | GFP_KERNEL); | |
2864 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2865 | goto out_ip6_dst_entries; |
d8d1f30b | 2866 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2867 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2868 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2869 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
2870 | ip6_template_metrics, true); | |
8ed67789 DL |
2871 | |
2872 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2873 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2874 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2875 | GFP_KERNEL); | |
68fffc67 PZ |
2876 | if (!net->ipv6.ip6_prohibit_entry) |
2877 | goto out_ip6_null_entry; | |
d8d1f30b | 2878 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2879 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2880 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2881 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
2882 | ip6_template_metrics, true); | |
8ed67789 DL |
2883 | |
2884 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2885 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2886 | GFP_KERNEL); | |
68fffc67 PZ |
2887 | if (!net->ipv6.ip6_blk_hole_entry) |
2888 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2889 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2890 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2891 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2892 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
2893 | ip6_template_metrics, true); | |
8ed67789 DL |
2894 | #endif |
2895 | ||
b339a47c PZ |
2896 | net->ipv6.sysctl.flush_delay = 0; |
2897 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2898 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2899 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2900 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2901 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2902 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2903 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2904 | ||
6891a346 BT |
2905 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2906 | ||
8ed67789 DL |
2907 | ret = 0; |
2908 | out: | |
2909 | return ret; | |
f2fc6a54 | 2910 | |
68fffc67 PZ |
2911 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2912 | out_ip6_prohibit_entry: | |
2913 | kfree(net->ipv6.ip6_prohibit_entry); | |
2914 | out_ip6_null_entry: | |
2915 | kfree(net->ipv6.ip6_null_entry); | |
2916 | #endif | |
fc66f95c ED |
2917 | out_ip6_dst_entries: |
2918 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2919 | out_ip6_dst_ops: |
f2fc6a54 | 2920 | goto out; |
cdb18761 DL |
2921 | } |
2922 | ||
2c8c1e72 | 2923 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 2924 | { |
8ed67789 DL |
2925 | kfree(net->ipv6.ip6_null_entry); |
2926 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2927 | kfree(net->ipv6.ip6_prohibit_entry); | |
2928 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2929 | #endif | |
41bb78b4 | 2930 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2931 | } |
2932 | ||
d189634e TG |
2933 | static int __net_init ip6_route_net_init_late(struct net *net) |
2934 | { | |
2935 | #ifdef CONFIG_PROC_FS | |
2936 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2937 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2938 | #endif | |
2939 | return 0; | |
2940 | } | |
2941 | ||
2942 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
2943 | { | |
2944 | #ifdef CONFIG_PROC_FS | |
2945 | proc_net_remove(net, "ipv6_route"); | |
2946 | proc_net_remove(net, "rt6_stats"); | |
2947 | #endif | |
2948 | } | |
2949 | ||
cdb18761 DL |
2950 | static struct pernet_operations ip6_route_net_ops = { |
2951 | .init = ip6_route_net_init, | |
2952 | .exit = ip6_route_net_exit, | |
2953 | }; | |
2954 | ||
c3426b47 DM |
2955 | static int __net_init ipv6_inetpeer_init(struct net *net) |
2956 | { | |
2957 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
2958 | ||
2959 | if (!bp) | |
2960 | return -ENOMEM; | |
2961 | inet_peer_base_init(bp); | |
2962 | net->ipv6.peers = bp; | |
2963 | return 0; | |
2964 | } | |
2965 | ||
2966 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
2967 | { | |
2968 | struct inet_peer_base *bp = net->ipv6.peers; | |
2969 | ||
2970 | net->ipv6.peers = NULL; | |
56a6b248 | 2971 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
2972 | kfree(bp); |
2973 | } | |
2974 | ||
2b823f72 | 2975 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
2976 | .init = ipv6_inetpeer_init, |
2977 | .exit = ipv6_inetpeer_exit, | |
2978 | }; | |
2979 | ||
d189634e TG |
2980 | static struct pernet_operations ip6_route_net_late_ops = { |
2981 | .init = ip6_route_net_init_late, | |
2982 | .exit = ip6_route_net_exit_late, | |
2983 | }; | |
2984 | ||
8ed67789 DL |
2985 | static struct notifier_block ip6_route_dev_notifier = { |
2986 | .notifier_call = ip6_route_dev_notify, | |
2987 | .priority = 0, | |
2988 | }; | |
2989 | ||
433d49c3 | 2990 | int __init ip6_route_init(void) |
1da177e4 | 2991 | { |
433d49c3 DL |
2992 | int ret; |
2993 | ||
9a7ec3a9 DL |
2994 | ret = -ENOMEM; |
2995 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2996 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2997 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2998 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 2999 | goto out; |
14e50e57 | 3000 | |
fc66f95c | 3001 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3002 | if (ret) |
bdb3289f | 3003 | goto out_kmem_cache; |
bdb3289f | 3004 | |
c3426b47 DM |
3005 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3006 | if (ret) | |
e8803b6c | 3007 | goto out_dst_entries; |
2a0c451a | 3008 | |
7e52b33b DM |
3009 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3010 | if (ret) | |
3011 | goto out_register_inetpeer; | |
c3426b47 | 3012 | |
5dc121e9 AE |
3013 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3014 | ||
8ed67789 DL |
3015 | /* Registering of the loopback is done before this portion of code, |
3016 | * the loopback reference in rt6_info will not be taken, do it | |
3017 | * manually for init_net */ | |
d8d1f30b | 3018 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3019 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3020 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3021 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3022 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3023 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3024 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3025 | #endif | |
e8803b6c | 3026 | ret = fib6_init(); |
433d49c3 | 3027 | if (ret) |
8ed67789 | 3028 | goto out_register_subsys; |
433d49c3 | 3029 | |
433d49c3 DL |
3030 | ret = xfrm6_init(); |
3031 | if (ret) | |
e8803b6c | 3032 | goto out_fib6_init; |
c35b7e72 | 3033 | |
433d49c3 DL |
3034 | ret = fib6_rules_init(); |
3035 | if (ret) | |
3036 | goto xfrm6_init; | |
7e5449c2 | 3037 | |
d189634e TG |
3038 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3039 | if (ret) | |
3040 | goto fib6_rules_init; | |
3041 | ||
433d49c3 | 3042 | ret = -ENOBUFS; |
c7ac8679 GR |
3043 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3044 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3045 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3046 | goto out_register_late_subsys; |
c127ea2c | 3047 | |
8ed67789 | 3048 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3049 | if (ret) |
d189634e | 3050 | goto out_register_late_subsys; |
8ed67789 | 3051 | |
433d49c3 DL |
3052 | out: |
3053 | return ret; | |
3054 | ||
d189634e TG |
3055 | out_register_late_subsys: |
3056 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3057 | fib6_rules_init: |
433d49c3 DL |
3058 | fib6_rules_cleanup(); |
3059 | xfrm6_init: | |
433d49c3 | 3060 | xfrm6_fini(); |
2a0c451a TG |
3061 | out_fib6_init: |
3062 | fib6_gc_cleanup(); | |
8ed67789 DL |
3063 | out_register_subsys: |
3064 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3065 | out_register_inetpeer: |
3066 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3067 | out_dst_entries: |
3068 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3069 | out_kmem_cache: |
f2fc6a54 | 3070 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3071 | goto out; |
1da177e4 LT |
3072 | } |
3073 | ||
3074 | void ip6_route_cleanup(void) | |
3075 | { | |
8ed67789 | 3076 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3077 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3078 | fib6_rules_cleanup(); |
1da177e4 | 3079 | xfrm6_fini(); |
1da177e4 | 3080 | fib6_gc_cleanup(); |
c3426b47 | 3081 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3082 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3083 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3084 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3085 | } |