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Commit | Line | Data |
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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); | |
6700c270 DM |
81 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
82 | struct sk_buff *skb, u32 mtu); | |
83 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
84 | struct sk_buff *skb); | |
1da177e4 | 85 | |
70ceb4f5 | 86 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 87 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
88 | const struct in6_addr *prefix, int prefixlen, |
89 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 90 | unsigned int pref); |
efa2cea0 | 91 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
92 | const struct in6_addr *prefix, int prefixlen, |
93 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
94 | #endif |
95 | ||
06582540 DM |
96 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
97 | { | |
98 | struct rt6_info *rt = (struct rt6_info *) dst; | |
99 | struct inet_peer *peer; | |
100 | u32 *p = NULL; | |
101 | ||
8e2ec639 YZ |
102 | if (!(rt->dst.flags & DST_HOST)) |
103 | return NULL; | |
104 | ||
fbfe95a4 | 105 | peer = rt6_get_peer_create(rt); |
06582540 DM |
106 | if (peer) { |
107 | u32 *old_p = __DST_METRICS_PTR(old); | |
108 | unsigned long prev, new; | |
109 | ||
110 | p = peer->metrics; | |
111 | if (inet_metrics_new(peer)) | |
112 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
113 | ||
114 | new = (unsigned long) p; | |
115 | prev = cmpxchg(&dst->_metrics, old, new); | |
116 | ||
117 | if (prev != old) { | |
118 | p = __DST_METRICS_PTR(prev); | |
119 | if (prev & DST_METRICS_READ_ONLY) | |
120 | p = NULL; | |
121 | } | |
122 | } | |
123 | return p; | |
124 | } | |
125 | ||
f894cbf8 DM |
126 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
127 | struct sk_buff *skb, | |
128 | const void *daddr) | |
39232973 DM |
129 | { |
130 | struct in6_addr *p = &rt->rt6i_gateway; | |
131 | ||
a7563f34 | 132 | if (!ipv6_addr_any(p)) |
39232973 | 133 | return (const void *) p; |
f894cbf8 DM |
134 | else if (skb) |
135 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
136 | return daddr; |
137 | } | |
138 | ||
f894cbf8 DM |
139 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
140 | struct sk_buff *skb, | |
141 | const void *daddr) | |
d3aaeb38 | 142 | { |
39232973 DM |
143 | struct rt6_info *rt = (struct rt6_info *) dst; |
144 | struct neighbour *n; | |
145 | ||
f894cbf8 | 146 | daddr = choose_neigh_daddr(rt, skb, daddr); |
39232973 | 147 | n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr); |
f83c7790 DM |
148 | if (n) |
149 | return n; | |
150 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
151 | } | |
152 | ||
8ade06c6 | 153 | static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev) |
f83c7790 | 154 | { |
8ade06c6 DM |
155 | struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dev, &rt->rt6i_gateway); |
156 | if (!n) { | |
157 | n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev); | |
158 | if (IS_ERR(n)) | |
159 | return PTR_ERR(n); | |
160 | } | |
97cac082 | 161 | rt->n = n; |
f83c7790 DM |
162 | |
163 | return 0; | |
d3aaeb38 DM |
164 | } |
165 | ||
9a7ec3a9 | 166 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 167 | .family = AF_INET6, |
09640e63 | 168 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
169 | .gc = ip6_dst_gc, |
170 | .gc_thresh = 1024, | |
171 | .check = ip6_dst_check, | |
0dbaee3b | 172 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 173 | .mtu = ip6_mtu, |
06582540 | 174 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
175 | .destroy = ip6_dst_destroy, |
176 | .ifdown = ip6_dst_ifdown, | |
177 | .negative_advice = ip6_negative_advice, | |
178 | .link_failure = ip6_link_failure, | |
179 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 180 | .redirect = rt6_do_redirect, |
1ac06e03 | 181 | .local_out = __ip6_local_out, |
d3aaeb38 | 182 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
183 | }; |
184 | ||
ebb762f2 | 185 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 186 | { |
618f9bc7 SK |
187 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
188 | ||
189 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
190 | } |
191 | ||
6700c270 DM |
192 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
193 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
194 | { |
195 | } | |
196 | ||
6700c270 DM |
197 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
198 | struct sk_buff *skb) | |
b587ee3b DM |
199 | { |
200 | } | |
201 | ||
0972ddb2 HB |
202 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
203 | unsigned long old) | |
204 | { | |
205 | return NULL; | |
206 | } | |
207 | ||
14e50e57 DM |
208 | static struct dst_ops ip6_dst_blackhole_ops = { |
209 | .family = AF_INET6, | |
09640e63 | 210 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
211 | .destroy = ip6_dst_destroy, |
212 | .check = ip6_dst_check, | |
ebb762f2 | 213 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 214 | .default_advmss = ip6_default_advmss, |
14e50e57 | 215 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 216 | .redirect = ip6_rt_blackhole_redirect, |
0972ddb2 | 217 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 218 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
219 | }; |
220 | ||
62fa8a84 DM |
221 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
222 | [RTAX_HOPLIMIT - 1] = 255, | |
223 | }; | |
224 | ||
fb0af4c7 | 225 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
226 | .dst = { |
227 | .__refcnt = ATOMIC_INIT(1), | |
228 | .__use = 1, | |
229 | .obsolete = -1, | |
230 | .error = -ENETUNREACH, | |
d8d1f30b CG |
231 | .input = ip6_pkt_discard, |
232 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
233 | }, |
234 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 235 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
236 | .rt6i_metric = ~(u32) 0, |
237 | .rt6i_ref = ATOMIC_INIT(1), | |
238 | }; | |
239 | ||
101367c2 TG |
240 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
241 | ||
6723ab54 DM |
242 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
243 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 244 | |
fb0af4c7 | 245 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
246 | .dst = { |
247 | .__refcnt = ATOMIC_INIT(1), | |
248 | .__use = 1, | |
249 | .obsolete = -1, | |
250 | .error = -EACCES, | |
d8d1f30b CG |
251 | .input = ip6_pkt_prohibit, |
252 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
253 | }, |
254 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 255 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
256 | .rt6i_metric = ~(u32) 0, |
257 | .rt6i_ref = ATOMIC_INIT(1), | |
258 | }; | |
259 | ||
fb0af4c7 | 260 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
261 | .dst = { |
262 | .__refcnt = ATOMIC_INIT(1), | |
263 | .__use = 1, | |
264 | .obsolete = -1, | |
265 | .error = -EINVAL, | |
d8d1f30b CG |
266 | .input = dst_discard, |
267 | .output = dst_discard, | |
101367c2 TG |
268 | }, |
269 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 270 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
271 | .rt6i_metric = ~(u32) 0, |
272 | .rt6i_ref = ATOMIC_INIT(1), | |
273 | }; | |
274 | ||
275 | #endif | |
276 | ||
1da177e4 | 277 | /* allocate dst with ip6_dst_ops */ |
97bab73f | 278 | static inline struct rt6_info *ip6_dst_alloc(struct net *net, |
957c665f | 279 | struct net_device *dev, |
8b96d22d DM |
280 | int flags, |
281 | struct fib6_table *table) | |
1da177e4 | 282 | { |
97bab73f | 283 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
f5b0a874 | 284 | 0, DST_OBSOLETE_NONE, flags); |
cf911662 | 285 | |
97bab73f | 286 | if (rt) { |
8104891b SK |
287 | struct dst_entry *dst = &rt->dst; |
288 | ||
289 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
8b96d22d | 290 | rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers); |
97bab73f | 291 | } |
cf911662 | 292 | return rt; |
1da177e4 LT |
293 | } |
294 | ||
295 | static void ip6_dst_destroy(struct dst_entry *dst) | |
296 | { | |
297 | struct rt6_info *rt = (struct rt6_info *)dst; | |
298 | struct inet6_dev *idev = rt->rt6i_idev; | |
299 | ||
97cac082 DM |
300 | if (rt->n) |
301 | neigh_release(rt->n); | |
302 | ||
8e2ec639 YZ |
303 | if (!(rt->dst.flags & DST_HOST)) |
304 | dst_destroy_metrics_generic(dst); | |
305 | ||
38308473 | 306 | if (idev) { |
1da177e4 LT |
307 | rt->rt6i_idev = NULL; |
308 | in6_dev_put(idev); | |
1ab1457c | 309 | } |
1716a961 G |
310 | |
311 | if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from) | |
312 | dst_release(dst->from); | |
313 | ||
97bab73f DM |
314 | if (rt6_has_peer(rt)) { |
315 | struct inet_peer *peer = rt6_peer_ptr(rt); | |
b3419363 DM |
316 | inet_putpeer(peer); |
317 | } | |
318 | } | |
319 | ||
6431cbc2 DM |
320 | static atomic_t __rt6_peer_genid = ATOMIC_INIT(0); |
321 | ||
322 | static u32 rt6_peer_genid(void) | |
323 | { | |
324 | return atomic_read(&__rt6_peer_genid); | |
325 | } | |
326 | ||
b3419363 DM |
327 | void rt6_bind_peer(struct rt6_info *rt, int create) |
328 | { | |
97bab73f | 329 | struct inet_peer_base *base; |
b3419363 DM |
330 | struct inet_peer *peer; |
331 | ||
97bab73f DM |
332 | base = inetpeer_base_ptr(rt->_rt6i_peer); |
333 | if (!base) | |
334 | return; | |
335 | ||
336 | peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create); | |
7b34ca2a DM |
337 | if (peer) { |
338 | if (!rt6_set_peer(rt, peer)) | |
339 | inet_putpeer(peer); | |
340 | else | |
341 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
342 | } | |
1da177e4 LT |
343 | } |
344 | ||
345 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
346 | int how) | |
347 | { | |
348 | struct rt6_info *rt = (struct rt6_info *)dst; | |
349 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 350 | struct net_device *loopback_dev = |
c346dca1 | 351 | dev_net(dev)->loopback_dev; |
1da177e4 | 352 | |
97cac082 DM |
353 | if (dev != loopback_dev) { |
354 | if (idev && idev->dev == dev) { | |
355 | struct inet6_dev *loopback_idev = | |
356 | in6_dev_get(loopback_dev); | |
357 | if (loopback_idev) { | |
358 | rt->rt6i_idev = loopback_idev; | |
359 | in6_dev_put(idev); | |
360 | } | |
361 | } | |
362 | if (rt->n && rt->n->dev == dev) { | |
363 | rt->n->dev = loopback_dev; | |
364 | dev_hold(loopback_dev); | |
365 | dev_put(dev); | |
1da177e4 LT |
366 | } |
367 | } | |
368 | } | |
369 | ||
a50feda5 | 370 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 371 | { |
1716a961 G |
372 | if (rt->rt6i_flags & RTF_EXPIRES) { |
373 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 374 | return true; |
1716a961 | 375 | } else if (rt->dst.from) { |
3fd91fb3 | 376 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 377 | } |
a50feda5 | 378 | return false; |
1da177e4 LT |
379 | } |
380 | ||
a50feda5 | 381 | static bool rt6_need_strict(const struct in6_addr *daddr) |
c71099ac | 382 | { |
a02cec21 ED |
383 | return ipv6_addr_type(daddr) & |
384 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
385 | } |
386 | ||
1da177e4 | 387 | /* |
c71099ac | 388 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
389 | */ |
390 | ||
8ed67789 DL |
391 | static inline struct rt6_info *rt6_device_match(struct net *net, |
392 | struct rt6_info *rt, | |
b71d1d42 | 393 | const struct in6_addr *saddr, |
1da177e4 | 394 | int oif, |
d420895e | 395 | int flags) |
1da177e4 LT |
396 | { |
397 | struct rt6_info *local = NULL; | |
398 | struct rt6_info *sprt; | |
399 | ||
dd3abc4e YH |
400 | if (!oif && ipv6_addr_any(saddr)) |
401 | goto out; | |
402 | ||
d8d1f30b | 403 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 404 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
405 | |
406 | if (oif) { | |
1da177e4 LT |
407 | if (dev->ifindex == oif) |
408 | return sprt; | |
409 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 410 | if (!sprt->rt6i_idev || |
1da177e4 | 411 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 412 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 413 | continue; |
1ab1457c | 414 | if (local && (!oif || |
1da177e4 LT |
415 | local->rt6i_idev->dev->ifindex == oif)) |
416 | continue; | |
417 | } | |
418 | local = sprt; | |
419 | } | |
dd3abc4e YH |
420 | } else { |
421 | if (ipv6_chk_addr(net, saddr, dev, | |
422 | flags & RT6_LOOKUP_F_IFACE)) | |
423 | return sprt; | |
1da177e4 | 424 | } |
dd3abc4e | 425 | } |
1da177e4 | 426 | |
dd3abc4e | 427 | if (oif) { |
1da177e4 LT |
428 | if (local) |
429 | return local; | |
430 | ||
d420895e | 431 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 432 | return net->ipv6.ip6_null_entry; |
1da177e4 | 433 | } |
dd3abc4e | 434 | out: |
1da177e4 LT |
435 | return rt; |
436 | } | |
437 | ||
27097255 YH |
438 | #ifdef CONFIG_IPV6_ROUTER_PREF |
439 | static void rt6_probe(struct rt6_info *rt) | |
440 | { | |
f2c31e32 | 441 | struct neighbour *neigh; |
27097255 YH |
442 | /* |
443 | * Okay, this does not seem to be appropriate | |
444 | * for now, however, we need to check if it | |
445 | * is really so; aka Router Reachability Probing. | |
446 | * | |
447 | * Router Reachability Probe MUST be rate-limited | |
448 | * to no more than one per minute. | |
449 | */ | |
97cac082 | 450 | neigh = rt ? rt->n : NULL; |
27097255 | 451 | if (!neigh || (neigh->nud_state & NUD_VALID)) |
fdd6681d | 452 | return; |
27097255 YH |
453 | read_lock_bh(&neigh->lock); |
454 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 455 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
456 | struct in6_addr mcaddr; |
457 | struct in6_addr *target; | |
458 | ||
459 | neigh->updated = jiffies; | |
460 | read_unlock_bh(&neigh->lock); | |
461 | ||
462 | target = (struct in6_addr *)&neigh->primary_key; | |
463 | addrconf_addr_solict_mult(target, &mcaddr); | |
d1918542 | 464 | ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL); |
f2c31e32 | 465 | } else { |
27097255 | 466 | read_unlock_bh(&neigh->lock); |
f2c31e32 | 467 | } |
27097255 YH |
468 | } |
469 | #else | |
470 | static inline void rt6_probe(struct rt6_info *rt) | |
471 | { | |
27097255 YH |
472 | } |
473 | #endif | |
474 | ||
1da177e4 | 475 | /* |
554cfb7e | 476 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 477 | */ |
b6f99a21 | 478 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 479 | { |
d1918542 | 480 | struct net_device *dev = rt->dst.dev; |
161980f4 | 481 | if (!oif || dev->ifindex == oif) |
554cfb7e | 482 | return 2; |
161980f4 DM |
483 | if ((dev->flags & IFF_LOOPBACK) && |
484 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
485 | return 1; | |
486 | return 0; | |
554cfb7e | 487 | } |
1da177e4 | 488 | |
b6f99a21 | 489 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 490 | { |
f2c31e32 | 491 | struct neighbour *neigh; |
398bcbeb | 492 | int m; |
f2c31e32 | 493 | |
97cac082 | 494 | neigh = rt->n; |
4d0c5911 YH |
495 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
496 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
497 | m = 1; | |
498 | else if (neigh) { | |
554cfb7e YH |
499 | read_lock_bh(&neigh->lock); |
500 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 501 | m = 2; |
398bcbeb YH |
502 | #ifdef CONFIG_IPV6_ROUTER_PREF |
503 | else if (neigh->nud_state & NUD_FAILED) | |
504 | m = 0; | |
505 | #endif | |
506 | else | |
ea73ee23 | 507 | m = 1; |
554cfb7e | 508 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
509 | } else |
510 | m = 0; | |
554cfb7e | 511 | return m; |
1da177e4 LT |
512 | } |
513 | ||
554cfb7e YH |
514 | static int rt6_score_route(struct rt6_info *rt, int oif, |
515 | int strict) | |
1da177e4 | 516 | { |
4d0c5911 | 517 | int m, n; |
1ab1457c | 518 | |
4d0c5911 | 519 | m = rt6_check_dev(rt, oif); |
77d16f45 | 520 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 521 | return -1; |
ebacaaa0 YH |
522 | #ifdef CONFIG_IPV6_ROUTER_PREF |
523 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
524 | #endif | |
4d0c5911 | 525 | n = rt6_check_neigh(rt); |
557e92ef | 526 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
527 | return -1; |
528 | return m; | |
529 | } | |
530 | ||
f11e6659 DM |
531 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
532 | int *mpri, struct rt6_info *match) | |
554cfb7e | 533 | { |
f11e6659 DM |
534 | int m; |
535 | ||
536 | if (rt6_check_expired(rt)) | |
537 | goto out; | |
538 | ||
539 | m = rt6_score_route(rt, oif, strict); | |
540 | if (m < 0) | |
541 | goto out; | |
542 | ||
543 | if (m > *mpri) { | |
544 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
545 | rt6_probe(match); | |
546 | *mpri = m; | |
547 | match = rt; | |
548 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
549 | rt6_probe(rt); | |
550 | } | |
551 | ||
552 | out: | |
553 | return match; | |
554 | } | |
555 | ||
556 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
557 | struct rt6_info *rr_head, | |
558 | u32 metric, int oif, int strict) | |
559 | { | |
560 | struct rt6_info *rt, *match; | |
554cfb7e | 561 | int mpri = -1; |
1da177e4 | 562 | |
f11e6659 DM |
563 | match = NULL; |
564 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 565 | rt = rt->dst.rt6_next) |
f11e6659 DM |
566 | match = find_match(rt, oif, strict, &mpri, match); |
567 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 568 | rt = rt->dst.rt6_next) |
f11e6659 | 569 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 570 | |
f11e6659 DM |
571 | return match; |
572 | } | |
1da177e4 | 573 | |
f11e6659 DM |
574 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
575 | { | |
576 | struct rt6_info *match, *rt0; | |
8ed67789 | 577 | struct net *net; |
1da177e4 | 578 | |
f11e6659 DM |
579 | rt0 = fn->rr_ptr; |
580 | if (!rt0) | |
581 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 582 | |
f11e6659 | 583 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 584 | |
554cfb7e | 585 | if (!match && |
f11e6659 | 586 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 587 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 588 | |
554cfb7e | 589 | /* no entries matched; do round-robin */ |
f11e6659 DM |
590 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
591 | next = fn->leaf; | |
592 | ||
593 | if (next != rt0) | |
594 | fn->rr_ptr = next; | |
1da177e4 | 595 | } |
1da177e4 | 596 | |
d1918542 | 597 | net = dev_net(rt0->dst.dev); |
a02cec21 | 598 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
599 | } |
600 | ||
70ceb4f5 YH |
601 | #ifdef CONFIG_IPV6_ROUTE_INFO |
602 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 603 | const struct in6_addr *gwaddr) |
70ceb4f5 | 604 | { |
c346dca1 | 605 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
606 | struct route_info *rinfo = (struct route_info *) opt; |
607 | struct in6_addr prefix_buf, *prefix; | |
608 | unsigned int pref; | |
4bed72e4 | 609 | unsigned long lifetime; |
70ceb4f5 YH |
610 | struct rt6_info *rt; |
611 | ||
612 | if (len < sizeof(struct route_info)) { | |
613 | return -EINVAL; | |
614 | } | |
615 | ||
616 | /* Sanity check for prefix_len and length */ | |
617 | if (rinfo->length > 3) { | |
618 | return -EINVAL; | |
619 | } else if (rinfo->prefix_len > 128) { | |
620 | return -EINVAL; | |
621 | } else if (rinfo->prefix_len > 64) { | |
622 | if (rinfo->length < 2) { | |
623 | return -EINVAL; | |
624 | } | |
625 | } else if (rinfo->prefix_len > 0) { | |
626 | if (rinfo->length < 1) { | |
627 | return -EINVAL; | |
628 | } | |
629 | } | |
630 | ||
631 | pref = rinfo->route_pref; | |
632 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 633 | return -EINVAL; |
70ceb4f5 | 634 | |
4bed72e4 | 635 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
636 | |
637 | if (rinfo->length == 3) | |
638 | prefix = (struct in6_addr *)rinfo->prefix; | |
639 | else { | |
640 | /* this function is safe */ | |
641 | ipv6_addr_prefix(&prefix_buf, | |
642 | (struct in6_addr *)rinfo->prefix, | |
643 | rinfo->prefix_len); | |
644 | prefix = &prefix_buf; | |
645 | } | |
646 | ||
efa2cea0 DL |
647 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
648 | dev->ifindex); | |
70ceb4f5 YH |
649 | |
650 | if (rt && !lifetime) { | |
e0a1ad73 | 651 | ip6_del_rt(rt); |
70ceb4f5 YH |
652 | rt = NULL; |
653 | } | |
654 | ||
655 | if (!rt && lifetime) | |
efa2cea0 | 656 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
657 | pref); |
658 | else if (rt) | |
659 | rt->rt6i_flags = RTF_ROUTEINFO | | |
660 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
661 | ||
662 | if (rt) { | |
1716a961 G |
663 | if (!addrconf_finite_timeout(lifetime)) |
664 | rt6_clean_expires(rt); | |
665 | else | |
666 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
667 | ||
d8d1f30b | 668 | dst_release(&rt->dst); |
70ceb4f5 YH |
669 | } |
670 | return 0; | |
671 | } | |
672 | #endif | |
673 | ||
8ed67789 | 674 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 675 | do { \ |
8ed67789 | 676 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 677 | struct fib6_node *pn; \ |
e0eda7bb | 678 | while (1) { \ |
982f56f3 YH |
679 | if (fn->fn_flags & RTN_TL_ROOT) \ |
680 | goto out; \ | |
681 | pn = fn->parent; \ | |
682 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 683 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
684 | else \ |
685 | fn = pn; \ | |
686 | if (fn->fn_flags & RTN_RTINFO) \ | |
687 | goto restart; \ | |
c71099ac | 688 | } \ |
c71099ac | 689 | } \ |
38308473 | 690 | } while (0) |
c71099ac | 691 | |
8ed67789 DL |
692 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
693 | struct fib6_table *table, | |
4c9483b2 | 694 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
695 | { |
696 | struct fib6_node *fn; | |
697 | struct rt6_info *rt; | |
698 | ||
c71099ac | 699 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 700 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
701 | restart: |
702 | rt = fn->leaf; | |
4c9483b2 DM |
703 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
704 | BACKTRACK(net, &fl6->saddr); | |
c71099ac | 705 | out: |
d8d1f30b | 706 | dst_use(&rt->dst, jiffies); |
c71099ac | 707 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
708 | return rt; |
709 | ||
710 | } | |
711 | ||
ea6e574e FW |
712 | struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
713 | int flags) | |
714 | { | |
715 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
716 | } | |
717 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
718 | ||
9acd9f3a YH |
719 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
720 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 721 | { |
4c9483b2 DM |
722 | struct flowi6 fl6 = { |
723 | .flowi6_oif = oif, | |
724 | .daddr = *daddr, | |
c71099ac TG |
725 | }; |
726 | struct dst_entry *dst; | |
77d16f45 | 727 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 728 | |
adaa70bb | 729 | if (saddr) { |
4c9483b2 | 730 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
731 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
732 | } | |
733 | ||
4c9483b2 | 734 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
735 | if (dst->error == 0) |
736 | return (struct rt6_info *) dst; | |
737 | ||
738 | dst_release(dst); | |
739 | ||
1da177e4 LT |
740 | return NULL; |
741 | } | |
742 | ||
7159039a YH |
743 | EXPORT_SYMBOL(rt6_lookup); |
744 | ||
c71099ac | 745 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
746 | It takes new route entry, the addition fails by any reason the |
747 | route is freed. In any case, if caller does not hold it, it may | |
748 | be destroyed. | |
749 | */ | |
750 | ||
86872cb5 | 751 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
752 | { |
753 | int err; | |
c71099ac | 754 | struct fib6_table *table; |
1da177e4 | 755 | |
c71099ac TG |
756 | table = rt->rt6i_table; |
757 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 758 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 759 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
760 | |
761 | return err; | |
762 | } | |
763 | ||
40e22e8f TG |
764 | int ip6_ins_rt(struct rt6_info *rt) |
765 | { | |
4d1169c1 | 766 | struct nl_info info = { |
d1918542 | 767 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 768 | }; |
528c4ceb | 769 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
770 | } |
771 | ||
1716a961 | 772 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, |
21efcfa0 | 773 | const struct in6_addr *daddr, |
b71d1d42 | 774 | const struct in6_addr *saddr) |
1da177e4 | 775 | { |
1da177e4 LT |
776 | struct rt6_info *rt; |
777 | ||
778 | /* | |
779 | * Clone the route. | |
780 | */ | |
781 | ||
21efcfa0 | 782 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
783 | |
784 | if (rt) { | |
14deae41 DM |
785 | int attempts = !in_softirq(); |
786 | ||
38308473 | 787 | if (!(rt->rt6i_flags & RTF_GATEWAY)) { |
bb3c3686 | 788 | if (ort->rt6i_dst.plen != 128 && |
21efcfa0 | 789 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) |
58c4fb86 | 790 | rt->rt6i_flags |= RTF_ANYCAST; |
4e3fd7a0 | 791 | rt->rt6i_gateway = *daddr; |
58c4fb86 | 792 | } |
1da177e4 | 793 | |
1da177e4 | 794 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
795 | |
796 | #ifdef CONFIG_IPV6_SUBTREES | |
797 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 798 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
799 | rt->rt6i_src.plen = 128; |
800 | } | |
801 | #endif | |
802 | ||
14deae41 | 803 | retry: |
8ade06c6 | 804 | if (rt6_bind_neighbour(rt, rt->dst.dev)) { |
d1918542 | 805 | struct net *net = dev_net(rt->dst.dev); |
14deae41 DM |
806 | int saved_rt_min_interval = |
807 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
808 | int saved_rt_elasticity = | |
809 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
810 | ||
811 | if (attempts-- > 0) { | |
812 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
813 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
814 | ||
86393e52 | 815 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
816 | |
817 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
818 | saved_rt_elasticity; | |
819 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
820 | saved_rt_min_interval; | |
821 | goto retry; | |
822 | } | |
823 | ||
f3213831 | 824 | net_warn_ratelimited("Neighbour table overflow\n"); |
d8d1f30b | 825 | dst_free(&rt->dst); |
14deae41 DM |
826 | return NULL; |
827 | } | |
95a9a5ba | 828 | } |
1da177e4 | 829 | |
95a9a5ba YH |
830 | return rt; |
831 | } | |
1da177e4 | 832 | |
21efcfa0 ED |
833 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
834 | const struct in6_addr *daddr) | |
299d9939 | 835 | { |
21efcfa0 ED |
836 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
837 | ||
299d9939 | 838 | if (rt) { |
299d9939 | 839 | rt->rt6i_flags |= RTF_CACHE; |
97cac082 | 840 | rt->n = neigh_clone(ort->n); |
299d9939 YH |
841 | } |
842 | return rt; | |
843 | } | |
844 | ||
8ed67789 | 845 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 846 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
847 | { |
848 | struct fib6_node *fn; | |
519fbd87 | 849 | struct rt6_info *rt, *nrt; |
c71099ac | 850 | int strict = 0; |
1da177e4 | 851 | int attempts = 3; |
519fbd87 | 852 | int err; |
53b7997f | 853 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 854 | |
77d16f45 | 855 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
856 | |
857 | relookup: | |
c71099ac | 858 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 859 | |
8238dd06 | 860 | restart_2: |
4c9483b2 | 861 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
862 | |
863 | restart: | |
4acad72d | 864 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 | 865 | |
4c9483b2 | 866 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 867 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 868 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 869 | goto out; |
1da177e4 | 870 | |
d8d1f30b | 871 | dst_hold(&rt->dst); |
c71099ac | 872 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 873 | |
97cac082 | 874 | if (!rt->n && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
4c9483b2 | 875 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 876 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 877 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
878 | else |
879 | goto out2; | |
e40cf353 | 880 | |
d8d1f30b | 881 | dst_release(&rt->dst); |
8ed67789 | 882 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 883 | |
d8d1f30b | 884 | dst_hold(&rt->dst); |
519fbd87 | 885 | if (nrt) { |
40e22e8f | 886 | err = ip6_ins_rt(nrt); |
519fbd87 | 887 | if (!err) |
1da177e4 | 888 | goto out2; |
1da177e4 | 889 | } |
1da177e4 | 890 | |
519fbd87 YH |
891 | if (--attempts <= 0) |
892 | goto out2; | |
893 | ||
894 | /* | |
c71099ac | 895 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
896 | * released someone could insert this route. Relookup. |
897 | */ | |
d8d1f30b | 898 | dst_release(&rt->dst); |
519fbd87 YH |
899 | goto relookup; |
900 | ||
901 | out: | |
8238dd06 YH |
902 | if (reachable) { |
903 | reachable = 0; | |
904 | goto restart_2; | |
905 | } | |
d8d1f30b | 906 | dst_hold(&rt->dst); |
c71099ac | 907 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 908 | out2: |
d8d1f30b CG |
909 | rt->dst.lastuse = jiffies; |
910 | rt->dst.__use++; | |
c71099ac TG |
911 | |
912 | return rt; | |
1da177e4 LT |
913 | } |
914 | ||
8ed67789 | 915 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 916 | struct flowi6 *fl6, int flags) |
4acad72d | 917 | { |
4c9483b2 | 918 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
919 | } |
920 | ||
72331bc0 SL |
921 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
922 | struct net_device *dev, | |
923 | struct flowi6 *fl6, int flags) | |
924 | { | |
925 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
926 | flags |= RT6_LOOKUP_F_IFACE; | |
927 | ||
928 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
929 | } | |
930 | ||
c71099ac TG |
931 | void ip6_route_input(struct sk_buff *skb) |
932 | { | |
b71d1d42 | 933 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 934 | struct net *net = dev_net(skb->dev); |
adaa70bb | 935 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
936 | struct flowi6 fl6 = { |
937 | .flowi6_iif = skb->dev->ifindex, | |
938 | .daddr = iph->daddr, | |
939 | .saddr = iph->saddr, | |
38308473 | 940 | .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK, |
4c9483b2 DM |
941 | .flowi6_mark = skb->mark, |
942 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 943 | }; |
adaa70bb | 944 | |
72331bc0 | 945 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
946 | } |
947 | ||
8ed67789 | 948 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 949 | struct flowi6 *fl6, int flags) |
1da177e4 | 950 | { |
4c9483b2 | 951 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
952 | } |
953 | ||
9c7a4f9c | 954 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 955 | struct flowi6 *fl6) |
c71099ac TG |
956 | { |
957 | int flags = 0; | |
958 | ||
1fb9489b | 959 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 960 | |
4c9483b2 | 961 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 962 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 963 | |
4c9483b2 | 964 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 965 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
966 | else if (sk) |
967 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 968 | |
4c9483b2 | 969 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
970 | } |
971 | ||
7159039a | 972 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 973 | |
2774c131 | 974 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 975 | { |
5c1e6aa3 | 976 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
977 | struct dst_entry *new = NULL; |
978 | ||
f5b0a874 | 979 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 980 | if (rt) { |
d8d1f30b | 981 | new = &rt->dst; |
14e50e57 | 982 | |
8104891b SK |
983 | memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); |
984 | rt6_init_peer(rt, net->ipv6.peers); | |
985 | ||
14e50e57 | 986 | new->__use = 1; |
352e512c HX |
987 | new->input = dst_discard; |
988 | new->output = dst_discard; | |
14e50e57 | 989 | |
21efcfa0 ED |
990 | if (dst_metrics_read_only(&ort->dst)) |
991 | new->_metrics = ort->dst._metrics; | |
992 | else | |
993 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
994 | rt->rt6i_idev = ort->rt6i_idev; |
995 | if (rt->rt6i_idev) | |
996 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 997 | |
4e3fd7a0 | 998 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
999 | rt->rt6i_flags = ort->rt6i_flags; |
1000 | rt6_clean_expires(rt); | |
14e50e57 DM |
1001 | rt->rt6i_metric = 0; |
1002 | ||
1003 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1004 | #ifdef CONFIG_IPV6_SUBTREES | |
1005 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1006 | #endif | |
1007 | ||
1008 | dst_free(new); | |
1009 | } | |
1010 | ||
69ead7af DM |
1011 | dst_release(dst_orig); |
1012 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1013 | } |
14e50e57 | 1014 | |
1da177e4 LT |
1015 | /* |
1016 | * Destination cache support functions | |
1017 | */ | |
1018 | ||
1019 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
1020 | { | |
1021 | struct rt6_info *rt; | |
1022 | ||
1023 | rt = (struct rt6_info *) dst; | |
1024 | ||
6431cbc2 DM |
1025 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) { |
1026 | if (rt->rt6i_peer_genid != rt6_peer_genid()) { | |
97bab73f | 1027 | if (!rt6_has_peer(rt)) |
6431cbc2 DM |
1028 | rt6_bind_peer(rt, 0); |
1029 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
1030 | } | |
1da177e4 | 1031 | return dst; |
6431cbc2 | 1032 | } |
1da177e4 LT |
1033 | return NULL; |
1034 | } | |
1035 | ||
1036 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1037 | { | |
1038 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1039 | ||
1040 | if (rt) { | |
54c1a859 YH |
1041 | if (rt->rt6i_flags & RTF_CACHE) { |
1042 | if (rt6_check_expired(rt)) { | |
1043 | ip6_del_rt(rt); | |
1044 | dst = NULL; | |
1045 | } | |
1046 | } else { | |
1da177e4 | 1047 | dst_release(dst); |
54c1a859 YH |
1048 | dst = NULL; |
1049 | } | |
1da177e4 | 1050 | } |
54c1a859 | 1051 | return dst; |
1da177e4 LT |
1052 | } |
1053 | ||
1054 | static void ip6_link_failure(struct sk_buff *skb) | |
1055 | { | |
1056 | struct rt6_info *rt; | |
1057 | ||
3ffe533c | 1058 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1059 | |
adf30907 | 1060 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1061 | if (rt) { |
1716a961 G |
1062 | if (rt->rt6i_flags & RTF_CACHE) |
1063 | rt6_update_expires(rt, 0); | |
1064 | else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
1da177e4 LT |
1065 | rt->rt6i_node->fn_sernum = -1; |
1066 | } | |
1067 | } | |
1068 | ||
6700c270 DM |
1069 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1070 | struct sk_buff *skb, u32 mtu) | |
1da177e4 LT |
1071 | { |
1072 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
1073 | ||
81aded24 | 1074 | dst_confirm(dst); |
1da177e4 | 1075 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { |
81aded24 DM |
1076 | struct net *net = dev_net(dst->dev); |
1077 | ||
1da177e4 LT |
1078 | rt6->rt6i_flags |= RTF_MODIFIED; |
1079 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 1080 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 1081 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
1082 | features |= RTAX_FEATURE_ALLFRAG; |
1083 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 1084 | } |
defb3519 | 1085 | dst_metric_set(dst, RTAX_MTU, mtu); |
81aded24 | 1086 | rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1087 | } |
1088 | } | |
1089 | ||
42ae66c8 DM |
1090 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
1091 | int oif, u32 mark) | |
81aded24 DM |
1092 | { |
1093 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1094 | struct dst_entry *dst; | |
1095 | struct flowi6 fl6; | |
1096 | ||
1097 | memset(&fl6, 0, sizeof(fl6)); | |
1098 | fl6.flowi6_oif = oif; | |
1099 | fl6.flowi6_mark = mark; | |
3e12939a | 1100 | fl6.flowi6_flags = 0; |
81aded24 DM |
1101 | fl6.daddr = iph->daddr; |
1102 | fl6.saddr = iph->saddr; | |
1103 | fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK; | |
1104 | ||
1105 | dst = ip6_route_output(net, NULL, &fl6); | |
1106 | if (!dst->error) | |
6700c270 | 1107 | ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu)); |
81aded24 DM |
1108 | dst_release(dst); |
1109 | } | |
1110 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1111 | ||
1112 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1113 | { | |
1114 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
1115 | sk->sk_bound_dev_if, sk->sk_mark); | |
1116 | } | |
1117 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1118 | ||
3a5ad2ee DM |
1119 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1120 | { | |
1121 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1122 | struct dst_entry *dst; | |
1123 | struct flowi6 fl6; | |
1124 | ||
1125 | memset(&fl6, 0, sizeof(fl6)); | |
1126 | fl6.flowi6_oif = oif; | |
1127 | fl6.flowi6_mark = mark; | |
1128 | fl6.flowi6_flags = 0; | |
1129 | fl6.daddr = iph->daddr; | |
1130 | fl6.saddr = iph->saddr; | |
1131 | fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK; | |
1132 | ||
1133 | dst = ip6_route_output(net, NULL, &fl6); | |
1134 | if (!dst->error) | |
6700c270 | 1135 | rt6_do_redirect(dst, NULL, skb); |
3a5ad2ee DM |
1136 | dst_release(dst); |
1137 | } | |
1138 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1139 | ||
1140 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1141 | { | |
1142 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1143 | } | |
1144 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1145 | ||
0dbaee3b | 1146 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1147 | { |
0dbaee3b DM |
1148 | struct net_device *dev = dst->dev; |
1149 | unsigned int mtu = dst_mtu(dst); | |
1150 | struct net *net = dev_net(dev); | |
1151 | ||
1da177e4 LT |
1152 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1153 | ||
5578689a DL |
1154 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1155 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1156 | |
1157 | /* | |
1ab1457c YH |
1158 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1159 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1160 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1161 | * rely only on pmtu discovery" |
1162 | */ | |
1163 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1164 | mtu = IPV6_MAXPLEN; | |
1165 | return mtu; | |
1166 | } | |
1167 | ||
ebb762f2 | 1168 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1169 | { |
d33e4553 | 1170 | struct inet6_dev *idev; |
618f9bc7 SK |
1171 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1172 | ||
1173 | if (mtu) | |
1174 | return mtu; | |
1175 | ||
1176 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1177 | |
1178 | rcu_read_lock(); | |
1179 | idev = __in6_dev_get(dst->dev); | |
1180 | if (idev) | |
1181 | mtu = idev->cnf.mtu6; | |
1182 | rcu_read_unlock(); | |
1183 | ||
1184 | return mtu; | |
1185 | } | |
1186 | ||
3b00944c YH |
1187 | static struct dst_entry *icmp6_dst_gc_list; |
1188 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1189 | |
3b00944c | 1190 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 1191 | struct neighbour *neigh, |
87a11578 | 1192 | struct flowi6 *fl6) |
1da177e4 | 1193 | { |
87a11578 | 1194 | struct dst_entry *dst; |
1da177e4 LT |
1195 | struct rt6_info *rt; |
1196 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1197 | struct net *net = dev_net(dev); |
1da177e4 | 1198 | |
38308473 | 1199 | if (unlikely(!idev)) |
122bdf67 | 1200 | return ERR_PTR(-ENODEV); |
1da177e4 | 1201 | |
8b96d22d | 1202 | rt = ip6_dst_alloc(net, dev, 0, NULL); |
38308473 | 1203 | if (unlikely(!rt)) { |
1da177e4 | 1204 | in6_dev_put(idev); |
87a11578 | 1205 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1206 | goto out; |
1207 | } | |
1208 | ||
1da177e4 LT |
1209 | if (neigh) |
1210 | neigh_hold(neigh); | |
14deae41 | 1211 | else { |
f894cbf8 | 1212 | neigh = ip6_neigh_lookup(&rt->dst, NULL, &fl6->daddr); |
b43faac6 | 1213 | if (IS_ERR(neigh)) { |
252c3d84 | 1214 | in6_dev_put(idev); |
b43faac6 DM |
1215 | dst_free(&rt->dst); |
1216 | return ERR_CAST(neigh); | |
1217 | } | |
14deae41 | 1218 | } |
1da177e4 | 1219 | |
8e2ec639 YZ |
1220 | rt->dst.flags |= DST_HOST; |
1221 | rt->dst.output = ip6_output; | |
97cac082 | 1222 | rt->n = neigh; |
d8d1f30b | 1223 | atomic_set(&rt->dst.__refcnt, 1); |
87a11578 | 1224 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1225 | rt->rt6i_dst.plen = 128; |
1226 | rt->rt6i_idev = idev; | |
7011687f | 1227 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255); |
1da177e4 | 1228 | |
3b00944c | 1229 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1230 | rt->dst.next = icmp6_dst_gc_list; |
1231 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1232 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1233 | |
5578689a | 1234 | fib6_force_start_gc(net); |
1da177e4 | 1235 | |
87a11578 DM |
1236 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1237 | ||
1da177e4 | 1238 | out: |
87a11578 | 1239 | return dst; |
1da177e4 LT |
1240 | } |
1241 | ||
3d0f24a7 | 1242 | int icmp6_dst_gc(void) |
1da177e4 | 1243 | { |
e9476e95 | 1244 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1245 | int more = 0; |
1da177e4 | 1246 | |
3b00944c YH |
1247 | spin_lock_bh(&icmp6_dst_lock); |
1248 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1249 | |
1da177e4 LT |
1250 | while ((dst = *pprev) != NULL) { |
1251 | if (!atomic_read(&dst->__refcnt)) { | |
1252 | *pprev = dst->next; | |
1253 | dst_free(dst); | |
1da177e4 LT |
1254 | } else { |
1255 | pprev = &dst->next; | |
3d0f24a7 | 1256 | ++more; |
1da177e4 LT |
1257 | } |
1258 | } | |
1259 | ||
3b00944c | 1260 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1261 | |
3d0f24a7 | 1262 | return more; |
1da177e4 LT |
1263 | } |
1264 | ||
1e493d19 DM |
1265 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1266 | void *arg) | |
1267 | { | |
1268 | struct dst_entry *dst, **pprev; | |
1269 | ||
1270 | spin_lock_bh(&icmp6_dst_lock); | |
1271 | pprev = &icmp6_dst_gc_list; | |
1272 | while ((dst = *pprev) != NULL) { | |
1273 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1274 | if (func(rt, arg)) { | |
1275 | *pprev = dst->next; | |
1276 | dst_free(dst); | |
1277 | } else { | |
1278 | pprev = &dst->next; | |
1279 | } | |
1280 | } | |
1281 | spin_unlock_bh(&icmp6_dst_lock); | |
1282 | } | |
1283 | ||
569d3645 | 1284 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1285 | { |
1da177e4 | 1286 | unsigned long now = jiffies; |
86393e52 | 1287 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1288 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1289 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1290 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1291 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1292 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1293 | int entries; |
7019b78e | 1294 | |
fc66f95c | 1295 | entries = dst_entries_get_fast(ops); |
7019b78e | 1296 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1297 | entries <= rt_max_size) |
1da177e4 LT |
1298 | goto out; |
1299 | ||
6891a346 BT |
1300 | net->ipv6.ip6_rt_gc_expire++; |
1301 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1302 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1303 | entries = dst_entries_get_slow(ops); |
1304 | if (entries < ops->gc_thresh) | |
7019b78e | 1305 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1306 | out: |
7019b78e | 1307 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1308 | return entries > rt_max_size; |
1da177e4 LT |
1309 | } |
1310 | ||
1311 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1312 | but results in cleaner routing tables. | |
1313 | ||
1314 | Remove it only when all the things will work! | |
1315 | */ | |
1316 | ||
6b75d090 | 1317 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1318 | { |
5170ae82 | 1319 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1320 | if (hoplimit == 0) { |
6b75d090 | 1321 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1322 | struct inet6_dev *idev; |
1323 | ||
1324 | rcu_read_lock(); | |
1325 | idev = __in6_dev_get(dev); | |
1326 | if (idev) | |
6b75d090 | 1327 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1328 | else |
53b7997f | 1329 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1330 | rcu_read_unlock(); |
1da177e4 LT |
1331 | } |
1332 | return hoplimit; | |
1333 | } | |
abbf46ae | 1334 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1335 | |
1336 | /* | |
1337 | * | |
1338 | */ | |
1339 | ||
86872cb5 | 1340 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1341 | { |
1342 | int err; | |
5578689a | 1343 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1344 | struct rt6_info *rt = NULL; |
1345 | struct net_device *dev = NULL; | |
1346 | struct inet6_dev *idev = NULL; | |
c71099ac | 1347 | struct fib6_table *table; |
1da177e4 LT |
1348 | int addr_type; |
1349 | ||
86872cb5 | 1350 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1351 | return -EINVAL; |
1352 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1353 | if (cfg->fc_src_len) |
1da177e4 LT |
1354 | return -EINVAL; |
1355 | #endif | |
86872cb5 | 1356 | if (cfg->fc_ifindex) { |
1da177e4 | 1357 | err = -ENODEV; |
5578689a | 1358 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1359 | if (!dev) |
1360 | goto out; | |
1361 | idev = in6_dev_get(dev); | |
1362 | if (!idev) | |
1363 | goto out; | |
1364 | } | |
1365 | ||
86872cb5 TG |
1366 | if (cfg->fc_metric == 0) |
1367 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1368 | |
d71314b4 | 1369 | err = -ENOBUFS; |
38308473 DM |
1370 | if (cfg->fc_nlinfo.nlh && |
1371 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1372 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1373 | if (!table) { |
f3213831 | 1374 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1375 | table = fib6_new_table(net, cfg->fc_table); |
1376 | } | |
1377 | } else { | |
1378 | table = fib6_new_table(net, cfg->fc_table); | |
1379 | } | |
38308473 DM |
1380 | |
1381 | if (!table) | |
c71099ac | 1382 | goto out; |
c71099ac | 1383 | |
8b96d22d | 1384 | rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table); |
1da177e4 | 1385 | |
38308473 | 1386 | if (!rt) { |
1da177e4 LT |
1387 | err = -ENOMEM; |
1388 | goto out; | |
1389 | } | |
1390 | ||
d8d1f30b | 1391 | rt->dst.obsolete = -1; |
1716a961 G |
1392 | |
1393 | if (cfg->fc_flags & RTF_EXPIRES) | |
1394 | rt6_set_expires(rt, jiffies + | |
1395 | clock_t_to_jiffies(cfg->fc_expires)); | |
1396 | else | |
1397 | rt6_clean_expires(rt); | |
1da177e4 | 1398 | |
86872cb5 TG |
1399 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1400 | cfg->fc_protocol = RTPROT_BOOT; | |
1401 | rt->rt6i_protocol = cfg->fc_protocol; | |
1402 | ||
1403 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1404 | |
1405 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1406 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1407 | else if (cfg->fc_flags & RTF_LOCAL) |
1408 | rt->dst.input = ip6_input; | |
1da177e4 | 1409 | else |
d8d1f30b | 1410 | rt->dst.input = ip6_forward; |
1da177e4 | 1411 | |
d8d1f30b | 1412 | rt->dst.output = ip6_output; |
1da177e4 | 1413 | |
86872cb5 TG |
1414 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1415 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1416 | if (rt->rt6i_dst.plen == 128) |
11d53b49 | 1417 | rt->dst.flags |= DST_HOST; |
1da177e4 | 1418 | |
8e2ec639 YZ |
1419 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
1420 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1421 | if (!metrics) { | |
1422 | err = -ENOMEM; | |
1423 | goto out; | |
1424 | } | |
1425 | dst_init_metrics(&rt->dst, metrics, 0); | |
1426 | } | |
1da177e4 | 1427 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1428 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1429 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1430 | #endif |
1431 | ||
86872cb5 | 1432 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1433 | |
1434 | /* We cannot add true routes via loopback here, | |
1435 | they would result in kernel looping; promote them to reject routes | |
1436 | */ | |
86872cb5 | 1437 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1438 | (dev && (dev->flags & IFF_LOOPBACK) && |
1439 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1440 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1441 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1442 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1443 | if (dev) { |
1444 | dev_put(dev); | |
1445 | in6_dev_put(idev); | |
1446 | } | |
5578689a | 1447 | dev = net->loopback_dev; |
1da177e4 LT |
1448 | dev_hold(dev); |
1449 | idev = in6_dev_get(dev); | |
1450 | if (!idev) { | |
1451 | err = -ENODEV; | |
1452 | goto out; | |
1453 | } | |
1454 | } | |
d8d1f30b CG |
1455 | rt->dst.output = ip6_pkt_discard_out; |
1456 | rt->dst.input = ip6_pkt_discard; | |
1da177e4 | 1457 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1458 | switch (cfg->fc_type) { |
1459 | case RTN_BLACKHOLE: | |
1460 | rt->dst.error = -EINVAL; | |
1461 | break; | |
1462 | case RTN_PROHIBIT: | |
1463 | rt->dst.error = -EACCES; | |
1464 | break; | |
b4949ab2 ND |
1465 | case RTN_THROW: |
1466 | rt->dst.error = -EAGAIN; | |
1467 | break; | |
ef2c7d7b ND |
1468 | default: |
1469 | rt->dst.error = -ENETUNREACH; | |
1470 | break; | |
1471 | } | |
1da177e4 LT |
1472 | goto install_route; |
1473 | } | |
1474 | ||
86872cb5 | 1475 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1476 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1477 | int gwa_type; |
1478 | ||
86872cb5 | 1479 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1480 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1481 | gwa_type = ipv6_addr_type(gw_addr); |
1482 | ||
1483 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1484 | struct rt6_info *grt; | |
1485 | ||
1486 | /* IPv6 strictly inhibits using not link-local | |
1487 | addresses as nexthop address. | |
1488 | Otherwise, router will not able to send redirects. | |
1489 | It is very good, but in some (rare!) circumstances | |
1490 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1491 | some exceptions. --ANK | |
1492 | */ | |
1493 | err = -EINVAL; | |
38308473 | 1494 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1495 | goto out; |
1496 | ||
5578689a | 1497 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1498 | |
1499 | err = -EHOSTUNREACH; | |
38308473 | 1500 | if (!grt) |
1da177e4 LT |
1501 | goto out; |
1502 | if (dev) { | |
d1918542 | 1503 | if (dev != grt->dst.dev) { |
d8d1f30b | 1504 | dst_release(&grt->dst); |
1da177e4 LT |
1505 | goto out; |
1506 | } | |
1507 | } else { | |
d1918542 | 1508 | dev = grt->dst.dev; |
1da177e4 LT |
1509 | idev = grt->rt6i_idev; |
1510 | dev_hold(dev); | |
1511 | in6_dev_hold(grt->rt6i_idev); | |
1512 | } | |
38308473 | 1513 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1514 | err = 0; |
d8d1f30b | 1515 | dst_release(&grt->dst); |
1da177e4 LT |
1516 | |
1517 | if (err) | |
1518 | goto out; | |
1519 | } | |
1520 | err = -EINVAL; | |
38308473 | 1521 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1522 | goto out; |
1523 | } | |
1524 | ||
1525 | err = -ENODEV; | |
38308473 | 1526 | if (!dev) |
1da177e4 LT |
1527 | goto out; |
1528 | ||
c3968a85 DW |
1529 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1530 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1531 | err = -EINVAL; | |
1532 | goto out; | |
1533 | } | |
4e3fd7a0 | 1534 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1535 | rt->rt6i_prefsrc.plen = 128; |
1536 | } else | |
1537 | rt->rt6i_prefsrc.plen = 0; | |
1538 | ||
86872cb5 | 1539 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
8ade06c6 | 1540 | err = rt6_bind_neighbour(rt, dev); |
f83c7790 | 1541 | if (err) |
1da177e4 | 1542 | goto out; |
1da177e4 LT |
1543 | } |
1544 | ||
86872cb5 | 1545 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1546 | |
1547 | install_route: | |
86872cb5 TG |
1548 | if (cfg->fc_mx) { |
1549 | struct nlattr *nla; | |
1550 | int remaining; | |
1551 | ||
1552 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1553 | int type = nla_type(nla); |
86872cb5 TG |
1554 | |
1555 | if (type) { | |
1556 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1557 | err = -EINVAL; |
1558 | goto out; | |
1559 | } | |
86872cb5 | 1560 | |
defb3519 | 1561 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1562 | } |
1da177e4 LT |
1563 | } |
1564 | } | |
1565 | ||
d8d1f30b | 1566 | rt->dst.dev = dev; |
1da177e4 | 1567 | rt->rt6i_idev = idev; |
c71099ac | 1568 | rt->rt6i_table = table; |
63152fc0 | 1569 | |
c346dca1 | 1570 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1571 | |
86872cb5 | 1572 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1573 | |
1574 | out: | |
1575 | if (dev) | |
1576 | dev_put(dev); | |
1577 | if (idev) | |
1578 | in6_dev_put(idev); | |
1579 | if (rt) | |
d8d1f30b | 1580 | dst_free(&rt->dst); |
1da177e4 LT |
1581 | return err; |
1582 | } | |
1583 | ||
86872cb5 | 1584 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1585 | { |
1586 | int err; | |
c71099ac | 1587 | struct fib6_table *table; |
d1918542 | 1588 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1589 | |
8ed67789 | 1590 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1591 | return -ENOENT; |
1592 | ||
c71099ac TG |
1593 | table = rt->rt6i_table; |
1594 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1595 | |
86872cb5 | 1596 | err = fib6_del(rt, info); |
d8d1f30b | 1597 | dst_release(&rt->dst); |
1da177e4 | 1598 | |
c71099ac | 1599 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1600 | |
1601 | return err; | |
1602 | } | |
1603 | ||
e0a1ad73 TG |
1604 | int ip6_del_rt(struct rt6_info *rt) |
1605 | { | |
4d1169c1 | 1606 | struct nl_info info = { |
d1918542 | 1607 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1608 | }; |
528c4ceb | 1609 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1610 | } |
1611 | ||
86872cb5 | 1612 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1613 | { |
c71099ac | 1614 | struct fib6_table *table; |
1da177e4 LT |
1615 | struct fib6_node *fn; |
1616 | struct rt6_info *rt; | |
1617 | int err = -ESRCH; | |
1618 | ||
5578689a | 1619 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1620 | if (!table) |
c71099ac TG |
1621 | return err; |
1622 | ||
1623 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1624 | |
c71099ac | 1625 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1626 | &cfg->fc_dst, cfg->fc_dst_len, |
1627 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1628 | |
1da177e4 | 1629 | if (fn) { |
d8d1f30b | 1630 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1631 | if (cfg->fc_ifindex && |
d1918542 DM |
1632 | (!rt->dst.dev || |
1633 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1634 | continue; |
86872cb5 TG |
1635 | if (cfg->fc_flags & RTF_GATEWAY && |
1636 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1637 | continue; |
86872cb5 | 1638 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1639 | continue; |
d8d1f30b | 1640 | dst_hold(&rt->dst); |
c71099ac | 1641 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1642 | |
86872cb5 | 1643 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1644 | } |
1645 | } | |
c71099ac | 1646 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1647 | |
1648 | return err; | |
1649 | } | |
1650 | ||
6700c270 | 1651 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 1652 | { |
e8599ff4 | 1653 | struct net *net = dev_net(skb->dev); |
a6279458 | 1654 | struct netevent_redirect netevent; |
e8599ff4 DM |
1655 | struct rt6_info *rt, *nrt = NULL; |
1656 | const struct in6_addr *target; | |
e8599ff4 | 1657 | struct ndisc_options ndopts; |
6e157b6a DM |
1658 | const struct in6_addr *dest; |
1659 | struct neighbour *old_neigh; | |
e8599ff4 DM |
1660 | struct inet6_dev *in6_dev; |
1661 | struct neighbour *neigh; | |
1662 | struct icmp6hdr *icmph; | |
6e157b6a DM |
1663 | int optlen, on_link; |
1664 | u8 *lladdr; | |
e8599ff4 DM |
1665 | |
1666 | optlen = skb->tail - skb->transport_header; | |
1667 | optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); | |
1668 | ||
1669 | if (optlen < 0) { | |
6e157b6a | 1670 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
1671 | return; |
1672 | } | |
1673 | ||
1674 | icmph = icmp6_hdr(skb); | |
1675 | target = (const struct in6_addr *) (icmph + 1); | |
1676 | dest = target + 1; | |
1677 | ||
1678 | if (ipv6_addr_is_multicast(dest)) { | |
6e157b6a | 1679 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
1680 | return; |
1681 | } | |
1682 | ||
6e157b6a | 1683 | on_link = 0; |
e8599ff4 DM |
1684 | if (ipv6_addr_equal(dest, target)) { |
1685 | on_link = 1; | |
1686 | } else if (ipv6_addr_type(target) != | |
1687 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { | |
6e157b6a | 1688 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
1689 | return; |
1690 | } | |
1691 | ||
1692 | in6_dev = __in6_dev_get(skb->dev); | |
1693 | if (!in6_dev) | |
1694 | return; | |
1695 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
1696 | return; | |
1697 | ||
1698 | /* RFC2461 8.1: | |
1699 | * The IP source address of the Redirect MUST be the same as the current | |
1700 | * first-hop router for the specified ICMP Destination Address. | |
1701 | */ | |
1702 | ||
1703 | if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) { | |
1704 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); | |
1705 | return; | |
1706 | } | |
6e157b6a DM |
1707 | |
1708 | lladdr = NULL; | |
e8599ff4 DM |
1709 | if (ndopts.nd_opts_tgt_lladdr) { |
1710 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1711 | skb->dev); | |
1712 | if (!lladdr) { | |
1713 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
1714 | return; | |
1715 | } | |
1716 | } | |
1717 | ||
6e157b6a DM |
1718 | rt = (struct rt6_info *) dst; |
1719 | if (rt == net->ipv6.ip6_null_entry) { | |
1720 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); | |
e8599ff4 | 1721 | return; |
6e157b6a | 1722 | } |
e8599ff4 | 1723 | |
6e157b6a DM |
1724 | /* Redirect received -> path was valid. |
1725 | * Look, redirects are sent only in response to data packets, | |
1726 | * so that this nexthop apparently is reachable. --ANK | |
1727 | */ | |
1728 | dst_confirm(&rt->dst); | |
a6279458 | 1729 | |
6e157b6a DM |
1730 | neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1); |
1731 | if (!neigh) | |
1732 | return; | |
a6279458 | 1733 | |
6e157b6a DM |
1734 | /* Duplicate redirect: silently ignore. */ |
1735 | old_neigh = rt->n; | |
1736 | if (neigh == old_neigh) | |
a6279458 | 1737 | goto out; |
1da177e4 | 1738 | |
1da177e4 LT |
1739 | /* |
1740 | * We have finally decided to accept it. | |
1741 | */ | |
1742 | ||
1ab1457c | 1743 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1744 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1745 | NEIGH_UPDATE_F_OVERRIDE| | |
1746 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1747 | NEIGH_UPDATE_F_ISROUTER)) | |
1748 | ); | |
1749 | ||
21efcfa0 | 1750 | nrt = ip6_rt_copy(rt, dest); |
38308473 | 1751 | if (!nrt) |
1da177e4 LT |
1752 | goto out; |
1753 | ||
1754 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1755 | if (on_link) | |
1756 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1757 | ||
4e3fd7a0 | 1758 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
97cac082 | 1759 | nrt->n = neigh_clone(neigh); |
1da177e4 | 1760 | |
40e22e8f | 1761 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1762 | goto out; |
1763 | ||
d8d1f30b | 1764 | netevent.old = &rt->dst; |
1d248b1c | 1765 | netevent.old_neigh = old_neigh; |
d8d1f30b | 1766 | netevent.new = &nrt->dst; |
1d248b1c DM |
1767 | netevent.new_neigh = neigh; |
1768 | netevent.daddr = dest; | |
8d71740c TT |
1769 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1770 | ||
38308473 | 1771 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 1772 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 1773 | ip6_del_rt(rt); |
1da177e4 LT |
1774 | } |
1775 | ||
1776 | out: | |
e8599ff4 | 1777 | neigh_release(neigh); |
6e157b6a DM |
1778 | } |
1779 | ||
1da177e4 LT |
1780 | /* |
1781 | * Misc support functions | |
1782 | */ | |
1783 | ||
1716a961 | 1784 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 1785 | const struct in6_addr *dest) |
1da177e4 | 1786 | { |
d1918542 | 1787 | struct net *net = dev_net(ort->dst.dev); |
8b96d22d DM |
1788 | struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0, |
1789 | ort->rt6i_table); | |
1da177e4 LT |
1790 | |
1791 | if (rt) { | |
d8d1f30b CG |
1792 | rt->dst.input = ort->dst.input; |
1793 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1794 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1795 | |
4e3fd7a0 | 1796 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1797 | rt->rt6i_dst.plen = 128; |
defb3519 | 1798 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1799 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1800 | rt->rt6i_idev = ort->rt6i_idev; |
1801 | if (rt->rt6i_idev) | |
1802 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1803 | rt->dst.lastuse = jiffies; |
1da177e4 | 1804 | |
4e3fd7a0 | 1805 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
1806 | rt->rt6i_flags = ort->rt6i_flags; |
1807 | if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) == | |
1808 | (RTF_DEFAULT | RTF_ADDRCONF)) | |
1809 | rt6_set_from(rt, ort); | |
1810 | else | |
1811 | rt6_clean_expires(rt); | |
1da177e4 LT |
1812 | rt->rt6i_metric = 0; |
1813 | ||
1da177e4 LT |
1814 | #ifdef CONFIG_IPV6_SUBTREES |
1815 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1816 | #endif | |
0f6c6392 | 1817 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1818 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1819 | } |
1820 | return rt; | |
1821 | } | |
1822 | ||
70ceb4f5 | 1823 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1824 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1825 | const struct in6_addr *prefix, int prefixlen, |
1826 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1827 | { |
1828 | struct fib6_node *fn; | |
1829 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1830 | struct fib6_table *table; |
1831 | ||
efa2cea0 | 1832 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 1833 | if (!table) |
c71099ac | 1834 | return NULL; |
70ceb4f5 | 1835 | |
5744dd9b | 1836 | read_lock_bh(&table->tb6_lock); |
c71099ac | 1837 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); |
70ceb4f5 YH |
1838 | if (!fn) |
1839 | goto out; | |
1840 | ||
d8d1f30b | 1841 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 1842 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
1843 | continue; |
1844 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1845 | continue; | |
1846 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1847 | continue; | |
d8d1f30b | 1848 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1849 | break; |
1850 | } | |
1851 | out: | |
5744dd9b | 1852 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1853 | return rt; |
1854 | } | |
1855 | ||
efa2cea0 | 1856 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
1857 | const struct in6_addr *prefix, int prefixlen, |
1858 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 1859 | unsigned int pref) |
70ceb4f5 | 1860 | { |
86872cb5 TG |
1861 | struct fib6_config cfg = { |
1862 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1863 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1864 | .fc_ifindex = ifindex, |
1865 | .fc_dst_len = prefixlen, | |
1866 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1867 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 1868 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
1869 | .fc_nlinfo.nlh = NULL, |
1870 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1871 | }; |
1872 | ||
4e3fd7a0 AD |
1873 | cfg.fc_dst = *prefix; |
1874 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 1875 | |
e317da96 YH |
1876 | /* We should treat it as a default route if prefix length is 0. */ |
1877 | if (!prefixlen) | |
86872cb5 | 1878 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1879 | |
86872cb5 | 1880 | ip6_route_add(&cfg); |
70ceb4f5 | 1881 | |
efa2cea0 | 1882 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1883 | } |
1884 | #endif | |
1885 | ||
b71d1d42 | 1886 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1887 | { |
1da177e4 | 1888 | struct rt6_info *rt; |
c71099ac | 1889 | struct fib6_table *table; |
1da177e4 | 1890 | |
c346dca1 | 1891 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 1892 | if (!table) |
c71099ac | 1893 | return NULL; |
1da177e4 | 1894 | |
5744dd9b | 1895 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1896 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
d1918542 | 1897 | if (dev == rt->dst.dev && |
045927ff | 1898 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1899 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1900 | break; | |
1901 | } | |
1902 | if (rt) | |
d8d1f30b | 1903 | dst_hold(&rt->dst); |
5744dd9b | 1904 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1905 | return rt; |
1906 | } | |
1907 | ||
b71d1d42 | 1908 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
1909 | struct net_device *dev, |
1910 | unsigned int pref) | |
1da177e4 | 1911 | { |
86872cb5 TG |
1912 | struct fib6_config cfg = { |
1913 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1914 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1915 | .fc_ifindex = dev->ifindex, |
1916 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1917 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 1918 | .fc_nlinfo.portid = 0, |
5578689a | 1919 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 1920 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1921 | }; |
1da177e4 | 1922 | |
4e3fd7a0 | 1923 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 1924 | |
86872cb5 | 1925 | ip6_route_add(&cfg); |
1da177e4 | 1926 | |
1da177e4 LT |
1927 | return rt6_get_dflt_router(gwaddr, dev); |
1928 | } | |
1929 | ||
7b4da532 | 1930 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1931 | { |
1932 | struct rt6_info *rt; | |
c71099ac TG |
1933 | struct fib6_table *table; |
1934 | ||
1935 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1936 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 1937 | if (!table) |
c71099ac | 1938 | return; |
1da177e4 LT |
1939 | |
1940 | restart: | |
c71099ac | 1941 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1942 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1943 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1944 | dst_hold(&rt->dst); |
c71099ac | 1945 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1946 | ip6_del_rt(rt); |
1da177e4 LT |
1947 | goto restart; |
1948 | } | |
1949 | } | |
c71099ac | 1950 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1951 | } |
1952 | ||
5578689a DL |
1953 | static void rtmsg_to_fib6_config(struct net *net, |
1954 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1955 | struct fib6_config *cfg) |
1956 | { | |
1957 | memset(cfg, 0, sizeof(*cfg)); | |
1958 | ||
1959 | cfg->fc_table = RT6_TABLE_MAIN; | |
1960 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1961 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1962 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1963 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1964 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1965 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1966 | ||
5578689a | 1967 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1968 | |
4e3fd7a0 AD |
1969 | cfg->fc_dst = rtmsg->rtmsg_dst; |
1970 | cfg->fc_src = rtmsg->rtmsg_src; | |
1971 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
1972 | } |
1973 | ||
5578689a | 1974 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1975 | { |
86872cb5 | 1976 | struct fib6_config cfg; |
1da177e4 LT |
1977 | struct in6_rtmsg rtmsg; |
1978 | int err; | |
1979 | ||
1980 | switch(cmd) { | |
1981 | case SIOCADDRT: /* Add a route */ | |
1982 | case SIOCDELRT: /* Delete a route */ | |
1983 | if (!capable(CAP_NET_ADMIN)) | |
1984 | return -EPERM; | |
1985 | err = copy_from_user(&rtmsg, arg, | |
1986 | sizeof(struct in6_rtmsg)); | |
1987 | if (err) | |
1988 | return -EFAULT; | |
86872cb5 | 1989 | |
5578689a | 1990 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1991 | |
1da177e4 LT |
1992 | rtnl_lock(); |
1993 | switch (cmd) { | |
1994 | case SIOCADDRT: | |
86872cb5 | 1995 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1996 | break; |
1997 | case SIOCDELRT: | |
86872cb5 | 1998 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1999 | break; |
2000 | default: | |
2001 | err = -EINVAL; | |
2002 | } | |
2003 | rtnl_unlock(); | |
2004 | ||
2005 | return err; | |
3ff50b79 | 2006 | } |
1da177e4 LT |
2007 | |
2008 | return -EINVAL; | |
2009 | } | |
2010 | ||
2011 | /* | |
2012 | * Drop the packet on the floor | |
2013 | */ | |
2014 | ||
d5fdd6ba | 2015 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2016 | { |
612f09e8 | 2017 | int type; |
adf30907 | 2018 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2019 | switch (ipstats_mib_noroutes) { |
2020 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2021 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2022 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2023 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2024 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2025 | break; |
2026 | } | |
2027 | /* FALLTHROUGH */ | |
2028 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2029 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2030 | ipstats_mib_noroutes); | |
612f09e8 YH |
2031 | break; |
2032 | } | |
3ffe533c | 2033 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2034 | kfree_skb(skb); |
2035 | return 0; | |
2036 | } | |
2037 | ||
9ce8ade0 TG |
2038 | static int ip6_pkt_discard(struct sk_buff *skb) |
2039 | { | |
612f09e8 | 2040 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2041 | } |
2042 | ||
20380731 | 2043 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 2044 | { |
adf30907 | 2045 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2046 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2047 | } |
2048 | ||
6723ab54 DM |
2049 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2050 | ||
9ce8ade0 TG |
2051 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2052 | { | |
612f09e8 | 2053 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2054 | } |
2055 | ||
2056 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
2057 | { | |
adf30907 | 2058 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2059 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2060 | } |
2061 | ||
6723ab54 DM |
2062 | #endif |
2063 | ||
1da177e4 LT |
2064 | /* |
2065 | * Allocate a dst for local (unicast / anycast) address. | |
2066 | */ | |
2067 | ||
2068 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2069 | const struct in6_addr *addr, | |
8f031519 | 2070 | bool anycast) |
1da177e4 | 2071 | { |
c346dca1 | 2072 | struct net *net = dev_net(idev->dev); |
8b96d22d | 2073 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL); |
f83c7790 | 2074 | int err; |
1da177e4 | 2075 | |
38308473 | 2076 | if (!rt) { |
f3213831 | 2077 | net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n"); |
1da177e4 | 2078 | return ERR_PTR(-ENOMEM); |
40385653 | 2079 | } |
1da177e4 | 2080 | |
1da177e4 LT |
2081 | in6_dev_hold(idev); |
2082 | ||
11d53b49 | 2083 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2084 | rt->dst.input = ip6_input; |
2085 | rt->dst.output = ip6_output; | |
1da177e4 | 2086 | rt->rt6i_idev = idev; |
d8d1f30b | 2087 | rt->dst.obsolete = -1; |
1da177e4 LT |
2088 | |
2089 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2090 | if (anycast) |
2091 | rt->rt6i_flags |= RTF_ANYCAST; | |
2092 | else | |
1da177e4 | 2093 | rt->rt6i_flags |= RTF_LOCAL; |
8ade06c6 | 2094 | err = rt6_bind_neighbour(rt, rt->dst.dev); |
f83c7790 | 2095 | if (err) { |
d8d1f30b | 2096 | dst_free(&rt->dst); |
f83c7790 | 2097 | return ERR_PTR(err); |
1da177e4 LT |
2098 | } |
2099 | ||
4e3fd7a0 | 2100 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2101 | rt->rt6i_dst.plen = 128; |
5578689a | 2102 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2103 | |
d8d1f30b | 2104 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2105 | |
2106 | return rt; | |
2107 | } | |
2108 | ||
c3968a85 DW |
2109 | int ip6_route_get_saddr(struct net *net, |
2110 | struct rt6_info *rt, | |
b71d1d42 | 2111 | const struct in6_addr *daddr, |
c3968a85 DW |
2112 | unsigned int prefs, |
2113 | struct in6_addr *saddr) | |
2114 | { | |
2115 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2116 | int err = 0; | |
2117 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2118 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2119 | else |
2120 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2121 | daddr, prefs, saddr); | |
2122 | return err; | |
2123 | } | |
2124 | ||
2125 | /* remove deleted ip from prefsrc entries */ | |
2126 | struct arg_dev_net_ip { | |
2127 | struct net_device *dev; | |
2128 | struct net *net; | |
2129 | struct in6_addr *addr; | |
2130 | }; | |
2131 | ||
2132 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2133 | { | |
2134 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2135 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2136 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2137 | ||
d1918542 | 2138 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2139 | rt != net->ipv6.ip6_null_entry && |
2140 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2141 | /* remove prefsrc entry */ | |
2142 | rt->rt6i_prefsrc.plen = 0; | |
2143 | } | |
2144 | return 0; | |
2145 | } | |
2146 | ||
2147 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2148 | { | |
2149 | struct net *net = dev_net(ifp->idev->dev); | |
2150 | struct arg_dev_net_ip adni = { | |
2151 | .dev = ifp->idev->dev, | |
2152 | .net = net, | |
2153 | .addr = &ifp->addr, | |
2154 | }; | |
2155 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); | |
2156 | } | |
2157 | ||
8ed67789 DL |
2158 | struct arg_dev_net { |
2159 | struct net_device *dev; | |
2160 | struct net *net; | |
2161 | }; | |
2162 | ||
1da177e4 LT |
2163 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2164 | { | |
bc3ef660 | 2165 | const struct arg_dev_net *adn = arg; |
2166 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2167 | |
d1918542 | 2168 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2169 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2170 | return -1; |
c159d30c | 2171 | |
1da177e4 LT |
2172 | return 0; |
2173 | } | |
2174 | ||
f3db4851 | 2175 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2176 | { |
8ed67789 DL |
2177 | struct arg_dev_net adn = { |
2178 | .dev = dev, | |
2179 | .net = net, | |
2180 | }; | |
2181 | ||
2182 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2183 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2184 | } |
2185 | ||
95c96174 | 2186 | struct rt6_mtu_change_arg { |
1da177e4 | 2187 | struct net_device *dev; |
95c96174 | 2188 | unsigned int mtu; |
1da177e4 LT |
2189 | }; |
2190 | ||
2191 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2192 | { | |
2193 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2194 | struct inet6_dev *idev; | |
2195 | ||
2196 | /* In IPv6 pmtu discovery is not optional, | |
2197 | so that RTAX_MTU lock cannot disable it. | |
2198 | We still use this lock to block changes | |
2199 | caused by addrconf/ndisc. | |
2200 | */ | |
2201 | ||
2202 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2203 | if (!idev) |
1da177e4 LT |
2204 | return 0; |
2205 | ||
2206 | /* For administrative MTU increase, there is no way to discover | |
2207 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2208 | Since RFC 1981 doesn't include administrative MTU increase | |
2209 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2210 | */ | |
2211 | /* | |
2212 | If new MTU is less than route PMTU, this new MTU will be the | |
2213 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2214 | decreases; if new MTU is greater than route PMTU, and the | |
2215 | old MTU is the lowest MTU in the path, update the route PMTU | |
2216 | to reflect the increase. In this case if the other nodes' MTU | |
2217 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2218 | PMTU discouvery. | |
2219 | */ | |
d1918542 | 2220 | if (rt->dst.dev == arg->dev && |
d8d1f30b CG |
2221 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2222 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2223 | (dst_mtu(&rt->dst) < arg->mtu && | |
2224 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2225 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2226 | } |
1da177e4 LT |
2227 | return 0; |
2228 | } | |
2229 | ||
95c96174 | 2230 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2231 | { |
c71099ac TG |
2232 | struct rt6_mtu_change_arg arg = { |
2233 | .dev = dev, | |
2234 | .mtu = mtu, | |
2235 | }; | |
1da177e4 | 2236 | |
c346dca1 | 2237 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2238 | } |
2239 | ||
ef7c79ed | 2240 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2241 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2242 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2243 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2244 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2245 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2246 | }; | |
2247 | ||
2248 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2249 | struct fib6_config *cfg) | |
1da177e4 | 2250 | { |
86872cb5 TG |
2251 | struct rtmsg *rtm; |
2252 | struct nlattr *tb[RTA_MAX+1]; | |
2253 | int err; | |
1da177e4 | 2254 | |
86872cb5 TG |
2255 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2256 | if (err < 0) | |
2257 | goto errout; | |
1da177e4 | 2258 | |
86872cb5 TG |
2259 | err = -EINVAL; |
2260 | rtm = nlmsg_data(nlh); | |
2261 | memset(cfg, 0, sizeof(*cfg)); | |
2262 | ||
2263 | cfg->fc_table = rtm->rtm_table; | |
2264 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2265 | cfg->fc_src_len = rtm->rtm_src_len; | |
2266 | cfg->fc_flags = RTF_UP; | |
2267 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2268 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2269 | |
ef2c7d7b ND |
2270 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2271 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2272 | rtm->rtm_type == RTN_PROHIBIT || |
2273 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2274 | cfg->fc_flags |= RTF_REJECT; |
2275 | ||
ab79ad14 MŻ |
2276 | if (rtm->rtm_type == RTN_LOCAL) |
2277 | cfg->fc_flags |= RTF_LOCAL; | |
2278 | ||
15e47304 | 2279 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2280 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2281 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2282 | |
2283 | if (tb[RTA_GATEWAY]) { | |
2284 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2285 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2286 | } |
86872cb5 TG |
2287 | |
2288 | if (tb[RTA_DST]) { | |
2289 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2290 | ||
2291 | if (nla_len(tb[RTA_DST]) < plen) | |
2292 | goto errout; | |
2293 | ||
2294 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2295 | } |
86872cb5 TG |
2296 | |
2297 | if (tb[RTA_SRC]) { | |
2298 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2299 | ||
2300 | if (nla_len(tb[RTA_SRC]) < plen) | |
2301 | goto errout; | |
2302 | ||
2303 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2304 | } |
86872cb5 | 2305 | |
c3968a85 DW |
2306 | if (tb[RTA_PREFSRC]) |
2307 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2308 | ||
86872cb5 TG |
2309 | if (tb[RTA_OIF]) |
2310 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2311 | ||
2312 | if (tb[RTA_PRIORITY]) | |
2313 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2314 | ||
2315 | if (tb[RTA_METRICS]) { | |
2316 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2317 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2318 | } |
86872cb5 TG |
2319 | |
2320 | if (tb[RTA_TABLE]) | |
2321 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2322 | ||
2323 | err = 0; | |
2324 | errout: | |
2325 | return err; | |
1da177e4 LT |
2326 | } |
2327 | ||
c127ea2c | 2328 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2329 | { |
86872cb5 TG |
2330 | struct fib6_config cfg; |
2331 | int err; | |
1da177e4 | 2332 | |
86872cb5 TG |
2333 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2334 | if (err < 0) | |
2335 | return err; | |
2336 | ||
2337 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2338 | } |
2339 | ||
c127ea2c | 2340 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2341 | { |
86872cb5 TG |
2342 | struct fib6_config cfg; |
2343 | int err; | |
1da177e4 | 2344 | |
86872cb5 TG |
2345 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2346 | if (err < 0) | |
2347 | return err; | |
2348 | ||
2349 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2350 | } |
2351 | ||
339bf98f TG |
2352 | static inline size_t rt6_nlmsg_size(void) |
2353 | { | |
2354 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2355 | + nla_total_size(16) /* RTA_SRC */ | |
2356 | + nla_total_size(16) /* RTA_DST */ | |
2357 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2358 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2359 | + nla_total_size(4) /* RTA_TABLE */ | |
2360 | + nla_total_size(4) /* RTA_IIF */ | |
2361 | + nla_total_size(4) /* RTA_OIF */ | |
2362 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2363 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2364 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2365 | } | |
2366 | ||
191cd582 BH |
2367 | static int rt6_fill_node(struct net *net, |
2368 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 2369 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 2370 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 2371 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2372 | { |
2373 | struct rtmsg *rtm; | |
2d7202bf | 2374 | struct nlmsghdr *nlh; |
e3703b3d | 2375 | long expires; |
9e762a4a | 2376 | u32 table; |
f2c31e32 | 2377 | struct neighbour *n; |
1da177e4 LT |
2378 | |
2379 | if (prefix) { /* user wants prefix routes only */ | |
2380 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2381 | /* success since this is not a prefix route */ | |
2382 | return 1; | |
2383 | } | |
2384 | } | |
2385 | ||
15e47304 | 2386 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 2387 | if (!nlh) |
26932566 | 2388 | return -EMSGSIZE; |
2d7202bf TG |
2389 | |
2390 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2391 | rtm->rtm_family = AF_INET6; |
2392 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2393 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2394 | rtm->rtm_tos = 0; | |
c71099ac | 2395 | if (rt->rt6i_table) |
9e762a4a | 2396 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2397 | else |
9e762a4a PM |
2398 | table = RT6_TABLE_UNSPEC; |
2399 | rtm->rtm_table = table; | |
c78679e8 DM |
2400 | if (nla_put_u32(skb, RTA_TABLE, table)) |
2401 | goto nla_put_failure; | |
ef2c7d7b ND |
2402 | if (rt->rt6i_flags & RTF_REJECT) { |
2403 | switch (rt->dst.error) { | |
2404 | case -EINVAL: | |
2405 | rtm->rtm_type = RTN_BLACKHOLE; | |
2406 | break; | |
2407 | case -EACCES: | |
2408 | rtm->rtm_type = RTN_PROHIBIT; | |
2409 | break; | |
b4949ab2 ND |
2410 | case -EAGAIN: |
2411 | rtm->rtm_type = RTN_THROW; | |
2412 | break; | |
ef2c7d7b ND |
2413 | default: |
2414 | rtm->rtm_type = RTN_UNREACHABLE; | |
2415 | break; | |
2416 | } | |
2417 | } | |
38308473 | 2418 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2419 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2420 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2421 | rtm->rtm_type = RTN_LOCAL; |
2422 | else | |
2423 | rtm->rtm_type = RTN_UNICAST; | |
2424 | rtm->rtm_flags = 0; | |
2425 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2426 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2427 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 2428 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
2429 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
2430 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
2431 | rtm->rtm_protocol = RTPROT_RA; | |
2432 | else | |
2433 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2434 | } | |
1da177e4 | 2435 | |
38308473 | 2436 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2437 | rtm->rtm_flags |= RTM_F_CLONED; |
2438 | ||
2439 | if (dst) { | |
c78679e8 DM |
2440 | if (nla_put(skb, RTA_DST, 16, dst)) |
2441 | goto nla_put_failure; | |
1ab1457c | 2442 | rtm->rtm_dst_len = 128; |
1da177e4 | 2443 | } else if (rtm->rtm_dst_len) |
c78679e8 DM |
2444 | if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) |
2445 | goto nla_put_failure; | |
1da177e4 LT |
2446 | #ifdef CONFIG_IPV6_SUBTREES |
2447 | if (src) { | |
c78679e8 DM |
2448 | if (nla_put(skb, RTA_SRC, 16, src)) |
2449 | goto nla_put_failure; | |
1ab1457c | 2450 | rtm->rtm_src_len = 128; |
c78679e8 DM |
2451 | } else if (rtm->rtm_src_len && |
2452 | nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) | |
2453 | goto nla_put_failure; | |
1da177e4 | 2454 | #endif |
7bc570c8 YH |
2455 | if (iif) { |
2456 | #ifdef CONFIG_IPV6_MROUTE | |
2457 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2458 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2459 | if (err <= 0) { |
2460 | if (!nowait) { | |
2461 | if (err == 0) | |
2462 | return 0; | |
2463 | goto nla_put_failure; | |
2464 | } else { | |
2465 | if (err == -EMSGSIZE) | |
2466 | goto nla_put_failure; | |
2467 | } | |
2468 | } | |
2469 | } else | |
2470 | #endif | |
c78679e8 DM |
2471 | if (nla_put_u32(skb, RTA_IIF, iif)) |
2472 | goto nla_put_failure; | |
7bc570c8 | 2473 | } else if (dst) { |
1da177e4 | 2474 | struct in6_addr saddr_buf; |
c78679e8 DM |
2475 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
2476 | nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) | |
2477 | goto nla_put_failure; | |
1da177e4 | 2478 | } |
2d7202bf | 2479 | |
c3968a85 DW |
2480 | if (rt->rt6i_prefsrc.plen) { |
2481 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2482 | saddr_buf = rt->rt6i_prefsrc.addr; |
c78679e8 DM |
2483 | if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
2484 | goto nla_put_failure; | |
c3968a85 DW |
2485 | } |
2486 | ||
defb3519 | 2487 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2488 | goto nla_put_failure; |
2489 | ||
97cac082 | 2490 | n = rt->n; |
94f826b8 | 2491 | if (n) { |
fdd6681d | 2492 | if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) |
94f826b8 | 2493 | goto nla_put_failure; |
94f826b8 | 2494 | } |
2d7202bf | 2495 | |
c78679e8 DM |
2496 | if (rt->dst.dev && |
2497 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2498 | goto nla_put_failure; | |
2499 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
2500 | goto nla_put_failure; | |
8253947e LW |
2501 | |
2502 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 2503 | |
87a50699 | 2504 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 2505 | goto nla_put_failure; |
2d7202bf TG |
2506 | |
2507 | return nlmsg_end(skb, nlh); | |
2508 | ||
2509 | nla_put_failure: | |
26932566 PM |
2510 | nlmsg_cancel(skb, nlh); |
2511 | return -EMSGSIZE; | |
1da177e4 LT |
2512 | } |
2513 | ||
1b43af54 | 2514 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2515 | { |
2516 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2517 | int prefix; | |
2518 | ||
2d7202bf TG |
2519 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2520 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2521 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2522 | } else | |
2523 | prefix = 0; | |
2524 | ||
191cd582 BH |
2525 | return rt6_fill_node(arg->net, |
2526 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 2527 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2528 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2529 | } |
2530 | ||
c127ea2c | 2531 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2532 | { |
3b1e0a65 | 2533 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2534 | struct nlattr *tb[RTA_MAX+1]; |
2535 | struct rt6_info *rt; | |
1da177e4 | 2536 | struct sk_buff *skb; |
ab364a6f | 2537 | struct rtmsg *rtm; |
4c9483b2 | 2538 | struct flowi6 fl6; |
72331bc0 | 2539 | int err, iif = 0, oif = 0; |
1da177e4 | 2540 | |
ab364a6f TG |
2541 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2542 | if (err < 0) | |
2543 | goto errout; | |
1da177e4 | 2544 | |
ab364a6f | 2545 | err = -EINVAL; |
4c9483b2 | 2546 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2547 | |
ab364a6f TG |
2548 | if (tb[RTA_SRC]) { |
2549 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2550 | goto errout; | |
2551 | ||
4e3fd7a0 | 2552 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2553 | } |
2554 | ||
2555 | if (tb[RTA_DST]) { | |
2556 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2557 | goto errout; | |
2558 | ||
4e3fd7a0 | 2559 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2560 | } |
2561 | ||
2562 | if (tb[RTA_IIF]) | |
2563 | iif = nla_get_u32(tb[RTA_IIF]); | |
2564 | ||
2565 | if (tb[RTA_OIF]) | |
72331bc0 | 2566 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 LT |
2567 | |
2568 | if (iif) { | |
2569 | struct net_device *dev; | |
72331bc0 SL |
2570 | int flags = 0; |
2571 | ||
5578689a | 2572 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2573 | if (!dev) { |
2574 | err = -ENODEV; | |
ab364a6f | 2575 | goto errout; |
1da177e4 | 2576 | } |
72331bc0 SL |
2577 | |
2578 | fl6.flowi6_iif = iif; | |
2579 | ||
2580 | if (!ipv6_addr_any(&fl6.saddr)) | |
2581 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2582 | ||
2583 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
2584 | flags); | |
2585 | } else { | |
2586 | fl6.flowi6_oif = oif; | |
2587 | ||
2588 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
2589 | } |
2590 | ||
ab364a6f | 2591 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2592 | if (!skb) { |
2173bff5 | 2593 | dst_release(&rt->dst); |
ab364a6f TG |
2594 | err = -ENOBUFS; |
2595 | goto errout; | |
2596 | } | |
1da177e4 | 2597 | |
ab364a6f TG |
2598 | /* Reserve room for dummy headers, this skb can pass |
2599 | through good chunk of routing engine. | |
2600 | */ | |
459a98ed | 2601 | skb_reset_mac_header(skb); |
ab364a6f | 2602 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2603 | |
d8d1f30b | 2604 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2605 | |
4c9483b2 | 2606 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 2607 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 2608 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2609 | if (err < 0) { |
ab364a6f TG |
2610 | kfree_skb(skb); |
2611 | goto errout; | |
1da177e4 LT |
2612 | } |
2613 | ||
15e47304 | 2614 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 2615 | errout: |
1da177e4 | 2616 | return err; |
1da177e4 LT |
2617 | } |
2618 | ||
86872cb5 | 2619 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2620 | { |
2621 | struct sk_buff *skb; | |
5578689a | 2622 | struct net *net = info->nl_net; |
528c4ceb DL |
2623 | u32 seq; |
2624 | int err; | |
2625 | ||
2626 | err = -ENOBUFS; | |
38308473 | 2627 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2628 | |
339bf98f | 2629 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2630 | if (!skb) |
21713ebc TG |
2631 | goto errout; |
2632 | ||
191cd582 | 2633 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
15e47304 | 2634 | event, info->portid, seq, 0, 0, 0); |
26932566 PM |
2635 | if (err < 0) { |
2636 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2637 | WARN_ON(err == -EMSGSIZE); | |
2638 | kfree_skb(skb); | |
2639 | goto errout; | |
2640 | } | |
15e47304 | 2641 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
2642 | info->nlh, gfp_any()); |
2643 | return; | |
21713ebc TG |
2644 | errout: |
2645 | if (err < 0) | |
5578689a | 2646 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2647 | } |
2648 | ||
8ed67789 DL |
2649 | static int ip6_route_dev_notify(struct notifier_block *this, |
2650 | unsigned long event, void *data) | |
2651 | { | |
2652 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2653 | struct net *net = dev_net(dev); |
8ed67789 DL |
2654 | |
2655 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2656 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2657 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2658 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2659 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2660 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2661 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2662 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2663 | #endif | |
2664 | } | |
2665 | ||
2666 | return NOTIFY_OK; | |
2667 | } | |
2668 | ||
1da177e4 LT |
2669 | /* |
2670 | * /proc | |
2671 | */ | |
2672 | ||
2673 | #ifdef CONFIG_PROC_FS | |
2674 | ||
1da177e4 LT |
2675 | struct rt6_proc_arg |
2676 | { | |
2677 | char *buffer; | |
2678 | int offset; | |
2679 | int length; | |
2680 | int skip; | |
2681 | int len; | |
2682 | }; | |
2683 | ||
2684 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2685 | { | |
33120b30 | 2686 | struct seq_file *m = p_arg; |
69cce1d1 | 2687 | struct neighbour *n; |
1da177e4 | 2688 | |
4b7a4274 | 2689 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2690 | |
2691 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2692 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2693 | #else |
33120b30 | 2694 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 | 2695 | #endif |
97cac082 | 2696 | n = rt->n; |
69cce1d1 DM |
2697 | if (n) { |
2698 | seq_printf(m, "%pi6", n->primary_key); | |
1da177e4 | 2699 | } else { |
33120b30 | 2700 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2701 | } |
33120b30 | 2702 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2703 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2704 | rt->dst.__use, rt->rt6i_flags, | |
d1918542 | 2705 | rt->dst.dev ? rt->dst.dev->name : ""); |
1da177e4 LT |
2706 | return 0; |
2707 | } | |
2708 | ||
33120b30 | 2709 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2710 | { |
f3db4851 | 2711 | struct net *net = (struct net *)m->private; |
32b293a5 | 2712 | fib6_clean_all_ro(net, rt6_info_route, 0, m); |
33120b30 AD |
2713 | return 0; |
2714 | } | |
1da177e4 | 2715 | |
33120b30 AD |
2716 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2717 | { | |
de05c557 | 2718 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2719 | } |
2720 | ||
33120b30 AD |
2721 | static const struct file_operations ipv6_route_proc_fops = { |
2722 | .owner = THIS_MODULE, | |
2723 | .open = ipv6_route_open, | |
2724 | .read = seq_read, | |
2725 | .llseek = seq_lseek, | |
b6fcbdb4 | 2726 | .release = single_release_net, |
33120b30 AD |
2727 | }; |
2728 | ||
1da177e4 LT |
2729 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2730 | { | |
69ddb805 | 2731 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2732 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2733 | net->ipv6.rt6_stats->fib_nodes, |
2734 | net->ipv6.rt6_stats->fib_route_nodes, | |
2735 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2736 | net->ipv6.rt6_stats->fib_rt_entries, | |
2737 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2738 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2739 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2740 | |
2741 | return 0; | |
2742 | } | |
2743 | ||
2744 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2745 | { | |
de05c557 | 2746 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2747 | } |
2748 | ||
9a32144e | 2749 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2750 | .owner = THIS_MODULE, |
2751 | .open = rt6_stats_seq_open, | |
2752 | .read = seq_read, | |
2753 | .llseek = seq_lseek, | |
b6fcbdb4 | 2754 | .release = single_release_net, |
1da177e4 LT |
2755 | }; |
2756 | #endif /* CONFIG_PROC_FS */ | |
2757 | ||
2758 | #ifdef CONFIG_SYSCTL | |
2759 | ||
1da177e4 | 2760 | static |
8d65af78 | 2761 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2762 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2763 | { | |
c486da34 LAG |
2764 | struct net *net; |
2765 | int delay; | |
2766 | if (!write) | |
1da177e4 | 2767 | return -EINVAL; |
c486da34 LAG |
2768 | |
2769 | net = (struct net *)ctl->extra1; | |
2770 | delay = net->ipv6.sysctl.flush_delay; | |
2771 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2772 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); | |
2773 | return 0; | |
1da177e4 LT |
2774 | } |
2775 | ||
760f2d01 | 2776 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2777 | { |
1da177e4 | 2778 | .procname = "flush", |
4990509f | 2779 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2780 | .maxlen = sizeof(int), |
89c8b3a1 | 2781 | .mode = 0200, |
6d9f239a | 2782 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2783 | }, |
2784 | { | |
1da177e4 | 2785 | .procname = "gc_thresh", |
9a7ec3a9 | 2786 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2787 | .maxlen = sizeof(int), |
2788 | .mode = 0644, | |
6d9f239a | 2789 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2790 | }, |
2791 | { | |
1da177e4 | 2792 | .procname = "max_size", |
4990509f | 2793 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2794 | .maxlen = sizeof(int), |
2795 | .mode = 0644, | |
6d9f239a | 2796 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2797 | }, |
2798 | { | |
1da177e4 | 2799 | .procname = "gc_min_interval", |
4990509f | 2800 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2801 | .maxlen = sizeof(int), |
2802 | .mode = 0644, | |
6d9f239a | 2803 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2804 | }, |
2805 | { | |
1da177e4 | 2806 | .procname = "gc_timeout", |
4990509f | 2807 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2808 | .maxlen = sizeof(int), |
2809 | .mode = 0644, | |
6d9f239a | 2810 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2811 | }, |
2812 | { | |
1da177e4 | 2813 | .procname = "gc_interval", |
4990509f | 2814 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2815 | .maxlen = sizeof(int), |
2816 | .mode = 0644, | |
6d9f239a | 2817 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2818 | }, |
2819 | { | |
1da177e4 | 2820 | .procname = "gc_elasticity", |
4990509f | 2821 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2822 | .maxlen = sizeof(int), |
2823 | .mode = 0644, | |
f3d3f616 | 2824 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2825 | }, |
2826 | { | |
1da177e4 | 2827 | .procname = "mtu_expires", |
4990509f | 2828 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2829 | .maxlen = sizeof(int), |
2830 | .mode = 0644, | |
6d9f239a | 2831 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2832 | }, |
2833 | { | |
1da177e4 | 2834 | .procname = "min_adv_mss", |
4990509f | 2835 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2836 | .maxlen = sizeof(int), |
2837 | .mode = 0644, | |
f3d3f616 | 2838 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2839 | }, |
2840 | { | |
1da177e4 | 2841 | .procname = "gc_min_interval_ms", |
4990509f | 2842 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2843 | .maxlen = sizeof(int), |
2844 | .mode = 0644, | |
6d9f239a | 2845 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2846 | }, |
f8572d8f | 2847 | { } |
1da177e4 LT |
2848 | }; |
2849 | ||
2c8c1e72 | 2850 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2851 | { |
2852 | struct ctl_table *table; | |
2853 | ||
2854 | table = kmemdup(ipv6_route_table_template, | |
2855 | sizeof(ipv6_route_table_template), | |
2856 | GFP_KERNEL); | |
5ee09105 YH |
2857 | |
2858 | if (table) { | |
2859 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2860 | table[0].extra1 = net; |
86393e52 | 2861 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2862 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2863 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2864 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2865 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2866 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2867 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2868 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2869 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2870 | } |
2871 | ||
760f2d01 DL |
2872 | return table; |
2873 | } | |
1da177e4 LT |
2874 | #endif |
2875 | ||
2c8c1e72 | 2876 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2877 | { |
633d424b | 2878 | int ret = -ENOMEM; |
8ed67789 | 2879 | |
86393e52 AD |
2880 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2881 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2882 | |
fc66f95c ED |
2883 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2884 | goto out_ip6_dst_ops; | |
2885 | ||
8ed67789 DL |
2886 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2887 | sizeof(*net->ipv6.ip6_null_entry), | |
2888 | GFP_KERNEL); | |
2889 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2890 | goto out_ip6_dst_entries; |
d8d1f30b | 2891 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2892 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2893 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2894 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
2895 | ip6_template_metrics, true); | |
8ed67789 DL |
2896 | |
2897 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2898 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2899 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2900 | GFP_KERNEL); | |
68fffc67 PZ |
2901 | if (!net->ipv6.ip6_prohibit_entry) |
2902 | goto out_ip6_null_entry; | |
d8d1f30b | 2903 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2904 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2905 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2906 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
2907 | ip6_template_metrics, true); | |
8ed67789 DL |
2908 | |
2909 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2910 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2911 | GFP_KERNEL); | |
68fffc67 PZ |
2912 | if (!net->ipv6.ip6_blk_hole_entry) |
2913 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2914 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2915 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2916 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2917 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
2918 | ip6_template_metrics, true); | |
8ed67789 DL |
2919 | #endif |
2920 | ||
b339a47c PZ |
2921 | net->ipv6.sysctl.flush_delay = 0; |
2922 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2923 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2924 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2925 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2926 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2927 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2928 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2929 | ||
6891a346 BT |
2930 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2931 | ||
8ed67789 DL |
2932 | ret = 0; |
2933 | out: | |
2934 | return ret; | |
f2fc6a54 | 2935 | |
68fffc67 PZ |
2936 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2937 | out_ip6_prohibit_entry: | |
2938 | kfree(net->ipv6.ip6_prohibit_entry); | |
2939 | out_ip6_null_entry: | |
2940 | kfree(net->ipv6.ip6_null_entry); | |
2941 | #endif | |
fc66f95c ED |
2942 | out_ip6_dst_entries: |
2943 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2944 | out_ip6_dst_ops: |
f2fc6a54 | 2945 | goto out; |
cdb18761 DL |
2946 | } |
2947 | ||
2c8c1e72 | 2948 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 2949 | { |
8ed67789 DL |
2950 | kfree(net->ipv6.ip6_null_entry); |
2951 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2952 | kfree(net->ipv6.ip6_prohibit_entry); | |
2953 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2954 | #endif | |
41bb78b4 | 2955 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2956 | } |
2957 | ||
d189634e TG |
2958 | static int __net_init ip6_route_net_init_late(struct net *net) |
2959 | { | |
2960 | #ifdef CONFIG_PROC_FS | |
2961 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2962 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2963 | #endif | |
2964 | return 0; | |
2965 | } | |
2966 | ||
2967 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
2968 | { | |
2969 | #ifdef CONFIG_PROC_FS | |
2970 | proc_net_remove(net, "ipv6_route"); | |
2971 | proc_net_remove(net, "rt6_stats"); | |
2972 | #endif | |
2973 | } | |
2974 | ||
cdb18761 DL |
2975 | static struct pernet_operations ip6_route_net_ops = { |
2976 | .init = ip6_route_net_init, | |
2977 | .exit = ip6_route_net_exit, | |
2978 | }; | |
2979 | ||
c3426b47 DM |
2980 | static int __net_init ipv6_inetpeer_init(struct net *net) |
2981 | { | |
2982 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
2983 | ||
2984 | if (!bp) | |
2985 | return -ENOMEM; | |
2986 | inet_peer_base_init(bp); | |
2987 | net->ipv6.peers = bp; | |
2988 | return 0; | |
2989 | } | |
2990 | ||
2991 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
2992 | { | |
2993 | struct inet_peer_base *bp = net->ipv6.peers; | |
2994 | ||
2995 | net->ipv6.peers = NULL; | |
56a6b248 | 2996 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
2997 | kfree(bp); |
2998 | } | |
2999 | ||
2b823f72 | 3000 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3001 | .init = ipv6_inetpeer_init, |
3002 | .exit = ipv6_inetpeer_exit, | |
3003 | }; | |
3004 | ||
d189634e TG |
3005 | static struct pernet_operations ip6_route_net_late_ops = { |
3006 | .init = ip6_route_net_init_late, | |
3007 | .exit = ip6_route_net_exit_late, | |
3008 | }; | |
3009 | ||
8ed67789 DL |
3010 | static struct notifier_block ip6_route_dev_notifier = { |
3011 | .notifier_call = ip6_route_dev_notify, | |
3012 | .priority = 0, | |
3013 | }; | |
3014 | ||
433d49c3 | 3015 | int __init ip6_route_init(void) |
1da177e4 | 3016 | { |
433d49c3 DL |
3017 | int ret; |
3018 | ||
9a7ec3a9 DL |
3019 | ret = -ENOMEM; |
3020 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3021 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3022 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3023 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3024 | goto out; |
14e50e57 | 3025 | |
fc66f95c | 3026 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3027 | if (ret) |
bdb3289f | 3028 | goto out_kmem_cache; |
bdb3289f | 3029 | |
c3426b47 DM |
3030 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3031 | if (ret) | |
e8803b6c | 3032 | goto out_dst_entries; |
2a0c451a | 3033 | |
7e52b33b DM |
3034 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3035 | if (ret) | |
3036 | goto out_register_inetpeer; | |
c3426b47 | 3037 | |
5dc121e9 AE |
3038 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3039 | ||
8ed67789 DL |
3040 | /* Registering of the loopback is done before this portion of code, |
3041 | * the loopback reference in rt6_info will not be taken, do it | |
3042 | * manually for init_net */ | |
d8d1f30b | 3043 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3044 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3045 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3046 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3047 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3048 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3049 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3050 | #endif | |
e8803b6c | 3051 | ret = fib6_init(); |
433d49c3 | 3052 | if (ret) |
8ed67789 | 3053 | goto out_register_subsys; |
433d49c3 | 3054 | |
433d49c3 DL |
3055 | ret = xfrm6_init(); |
3056 | if (ret) | |
e8803b6c | 3057 | goto out_fib6_init; |
c35b7e72 | 3058 | |
433d49c3 DL |
3059 | ret = fib6_rules_init(); |
3060 | if (ret) | |
3061 | goto xfrm6_init; | |
7e5449c2 | 3062 | |
d189634e TG |
3063 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3064 | if (ret) | |
3065 | goto fib6_rules_init; | |
3066 | ||
433d49c3 | 3067 | ret = -ENOBUFS; |
c7ac8679 GR |
3068 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3069 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3070 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3071 | goto out_register_late_subsys; |
c127ea2c | 3072 | |
8ed67789 | 3073 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3074 | if (ret) |
d189634e | 3075 | goto out_register_late_subsys; |
8ed67789 | 3076 | |
433d49c3 DL |
3077 | out: |
3078 | return ret; | |
3079 | ||
d189634e TG |
3080 | out_register_late_subsys: |
3081 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3082 | fib6_rules_init: |
433d49c3 DL |
3083 | fib6_rules_cleanup(); |
3084 | xfrm6_init: | |
433d49c3 | 3085 | xfrm6_fini(); |
2a0c451a TG |
3086 | out_fib6_init: |
3087 | fib6_gc_cleanup(); | |
8ed67789 DL |
3088 | out_register_subsys: |
3089 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3090 | out_register_inetpeer: |
3091 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3092 | out_dst_entries: |
3093 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3094 | out_kmem_cache: |
f2fc6a54 | 3095 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3096 | goto out; |
1da177e4 LT |
3097 | } |
3098 | ||
3099 | void ip6_route_cleanup(void) | |
3100 | { | |
8ed67789 | 3101 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3102 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3103 | fib6_rules_cleanup(); |
1da177e4 | 3104 | xfrm6_fini(); |
1da177e4 | 3105 | fib6_gc_cleanup(); |
c3426b47 | 3106 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3107 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3108 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3109 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3110 | } |