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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 | ||
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/times.h> | |
31 | #include <linux/socket.h> | |
32 | #include <linux/sockios.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/route.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/in6.h> | |
7bc570c8 | 37 | #include <linux/mroute6.h> |
1da177e4 | 38 | #include <linux/init.h> |
1da177e4 | 39 | #include <linux/if_arp.h> |
1da177e4 LT |
40 | #include <linux/proc_fs.h> |
41 | #include <linux/seq_file.h> | |
5b7c931d | 42 | #include <linux/nsproxy.h> |
5a0e3ad6 | 43 | #include <linux/slab.h> |
457c4cbc | 44 | #include <net/net_namespace.h> |
1da177e4 LT |
45 | #include <net/snmp.h> |
46 | #include <net/ipv6.h> | |
47 | #include <net/ip6_fib.h> | |
48 | #include <net/ip6_route.h> | |
49 | #include <net/ndisc.h> | |
50 | #include <net/addrconf.h> | |
51 | #include <net/tcp.h> | |
52 | #include <linux/rtnetlink.h> | |
53 | #include <net/dst.h> | |
54 | #include <net/xfrm.h> | |
8d71740c | 55 | #include <net/netevent.h> |
21713ebc | 56 | #include <net/netlink.h> |
1da177e4 LT |
57 | |
58 | #include <asm/uaccess.h> | |
59 | ||
60 | #ifdef CONFIG_SYSCTL | |
61 | #include <linux/sysctl.h> | |
62 | #endif | |
63 | ||
64 | /* Set to 3 to get tracing. */ | |
65 | #define RT6_DEBUG 2 | |
66 | ||
67 | #if RT6_DEBUG >= 3 | |
68 | #define RDBG(x) printk x | |
69 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
70 | #else | |
71 | #define RDBG(x) | |
72 | #define RT6_TRACE(x...) do { ; } while (0) | |
73 | #endif | |
74 | ||
519fbd87 | 75 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 76 | |
1da177e4 LT |
77 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
78 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 79 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
1da177e4 LT |
80 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
81 | static void ip6_dst_destroy(struct dst_entry *); | |
82 | static void ip6_dst_ifdown(struct dst_entry *, | |
83 | struct net_device *dev, int how); | |
569d3645 | 84 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
85 | |
86 | static int ip6_pkt_discard(struct sk_buff *skb); | |
87 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
88 | static void ip6_link_failure(struct sk_buff *skb); | |
89 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
90 | ||
70ceb4f5 | 91 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
92 | static struct rt6_info *rt6_add_route_info(struct net *net, |
93 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
94 | struct in6_addr *gwaddr, int ifindex, |
95 | unsigned pref); | |
efa2cea0 DL |
96 | static struct rt6_info *rt6_get_route_info(struct net *net, |
97 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
98 | struct in6_addr *gwaddr, int ifindex); |
99 | #endif | |
100 | ||
9a7ec3a9 | 101 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 102 | .family = AF_INET6, |
09640e63 | 103 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
104 | .gc = ip6_dst_gc, |
105 | .gc_thresh = 1024, | |
106 | .check = ip6_dst_check, | |
0dbaee3b | 107 | .default_advmss = ip6_default_advmss, |
1da177e4 LT |
108 | .destroy = ip6_dst_destroy, |
109 | .ifdown = ip6_dst_ifdown, | |
110 | .negative_advice = ip6_negative_advice, | |
111 | .link_failure = ip6_link_failure, | |
112 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 113 | .local_out = __ip6_local_out, |
1da177e4 LT |
114 | }; |
115 | ||
14e50e57 DM |
116 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
117 | { | |
118 | } | |
119 | ||
120 | static struct dst_ops ip6_dst_blackhole_ops = { | |
121 | .family = AF_INET6, | |
09640e63 | 122 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
123 | .destroy = ip6_dst_destroy, |
124 | .check = ip6_dst_check, | |
125 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
14e50e57 DM |
126 | }; |
127 | ||
bdb3289f | 128 | static struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
129 | .dst = { |
130 | .__refcnt = ATOMIC_INIT(1), | |
131 | .__use = 1, | |
132 | .obsolete = -1, | |
133 | .error = -ENETUNREACH, | |
d8d1f30b CG |
134 | .input = ip6_pkt_discard, |
135 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
136 | }, |
137 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 138 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
139 | .rt6i_metric = ~(u32) 0, |
140 | .rt6i_ref = ATOMIC_INIT(1), | |
141 | }; | |
142 | ||
101367c2 TG |
143 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
144 | ||
6723ab54 DM |
145 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
146 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 147 | |
280a34c8 | 148 | static struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
149 | .dst = { |
150 | .__refcnt = ATOMIC_INIT(1), | |
151 | .__use = 1, | |
152 | .obsolete = -1, | |
153 | .error = -EACCES, | |
d8d1f30b CG |
154 | .input = ip6_pkt_prohibit, |
155 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
156 | }, |
157 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 158 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
159 | .rt6i_metric = ~(u32) 0, |
160 | .rt6i_ref = ATOMIC_INIT(1), | |
161 | }; | |
162 | ||
bdb3289f | 163 | static struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
164 | .dst = { |
165 | .__refcnt = ATOMIC_INIT(1), | |
166 | .__use = 1, | |
167 | .obsolete = -1, | |
168 | .error = -EINVAL, | |
d8d1f30b CG |
169 | .input = dst_discard, |
170 | .output = dst_discard, | |
101367c2 TG |
171 | }, |
172 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 173 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
174 | .rt6i_metric = ~(u32) 0, |
175 | .rt6i_ref = ATOMIC_INIT(1), | |
176 | }; | |
177 | ||
178 | #endif | |
179 | ||
1da177e4 | 180 | /* allocate dst with ip6_dst_ops */ |
f2fc6a54 | 181 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops) |
1da177e4 | 182 | { |
f2fc6a54 | 183 | return (struct rt6_info *)dst_alloc(ops); |
1da177e4 LT |
184 | } |
185 | ||
186 | static void ip6_dst_destroy(struct dst_entry *dst) | |
187 | { | |
188 | struct rt6_info *rt = (struct rt6_info *)dst; | |
189 | struct inet6_dev *idev = rt->rt6i_idev; | |
b3419363 | 190 | struct inet_peer *peer = rt->rt6i_peer; |
1da177e4 LT |
191 | |
192 | if (idev != NULL) { | |
193 | rt->rt6i_idev = NULL; | |
194 | in6_dev_put(idev); | |
1ab1457c | 195 | } |
b3419363 DM |
196 | if (peer) { |
197 | BUG_ON(!(rt->rt6i_flags & RTF_CACHE)); | |
198 | rt->rt6i_peer = NULL; | |
199 | inet_putpeer(peer); | |
200 | } | |
201 | } | |
202 | ||
203 | void rt6_bind_peer(struct rt6_info *rt, int create) | |
204 | { | |
205 | struct inet_peer *peer; | |
206 | ||
207 | if (WARN_ON(!(rt->rt6i_flags & RTF_CACHE))) | |
208 | return; | |
209 | ||
210 | peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create); | |
211 | if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL) | |
212 | inet_putpeer(peer); | |
1da177e4 LT |
213 | } |
214 | ||
215 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
216 | int how) | |
217 | { | |
218 | struct rt6_info *rt = (struct rt6_info *)dst; | |
219 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 220 | struct net_device *loopback_dev = |
c346dca1 | 221 | dev_net(dev)->loopback_dev; |
1da177e4 | 222 | |
5a3e55d6 DL |
223 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
224 | struct inet6_dev *loopback_idev = | |
225 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
226 | if (loopback_idev != NULL) { |
227 | rt->rt6i_idev = loopback_idev; | |
228 | in6_dev_put(idev); | |
229 | } | |
230 | } | |
231 | } | |
232 | ||
233 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
234 | { | |
a02cec21 ED |
235 | return (rt->rt6i_flags & RTF_EXPIRES) && |
236 | time_after(jiffies, rt->rt6i_expires); | |
1da177e4 LT |
237 | } |
238 | ||
c71099ac TG |
239 | static inline int rt6_need_strict(struct in6_addr *daddr) |
240 | { | |
a02cec21 ED |
241 | return ipv6_addr_type(daddr) & |
242 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
243 | } |
244 | ||
1da177e4 | 245 | /* |
c71099ac | 246 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
247 | */ |
248 | ||
8ed67789 DL |
249 | static inline struct rt6_info *rt6_device_match(struct net *net, |
250 | struct rt6_info *rt, | |
dd3abc4e | 251 | struct in6_addr *saddr, |
1da177e4 | 252 | int oif, |
d420895e | 253 | int flags) |
1da177e4 LT |
254 | { |
255 | struct rt6_info *local = NULL; | |
256 | struct rt6_info *sprt; | |
257 | ||
dd3abc4e YH |
258 | if (!oif && ipv6_addr_any(saddr)) |
259 | goto out; | |
260 | ||
d8d1f30b | 261 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
dd3abc4e YH |
262 | struct net_device *dev = sprt->rt6i_dev; |
263 | ||
264 | if (oif) { | |
1da177e4 LT |
265 | if (dev->ifindex == oif) |
266 | return sprt; | |
267 | if (dev->flags & IFF_LOOPBACK) { | |
268 | if (sprt->rt6i_idev == NULL || | |
269 | sprt->rt6i_idev->dev->ifindex != oif) { | |
d420895e | 270 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 271 | continue; |
1ab1457c | 272 | if (local && (!oif || |
1da177e4 LT |
273 | local->rt6i_idev->dev->ifindex == oif)) |
274 | continue; | |
275 | } | |
276 | local = sprt; | |
277 | } | |
dd3abc4e YH |
278 | } else { |
279 | if (ipv6_chk_addr(net, saddr, dev, | |
280 | flags & RT6_LOOKUP_F_IFACE)) | |
281 | return sprt; | |
1da177e4 | 282 | } |
dd3abc4e | 283 | } |
1da177e4 | 284 | |
dd3abc4e | 285 | if (oif) { |
1da177e4 LT |
286 | if (local) |
287 | return local; | |
288 | ||
d420895e | 289 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 290 | return net->ipv6.ip6_null_entry; |
1da177e4 | 291 | } |
dd3abc4e | 292 | out: |
1da177e4 LT |
293 | return rt; |
294 | } | |
295 | ||
27097255 YH |
296 | #ifdef CONFIG_IPV6_ROUTER_PREF |
297 | static void rt6_probe(struct rt6_info *rt) | |
298 | { | |
299 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
300 | /* | |
301 | * Okay, this does not seem to be appropriate | |
302 | * for now, however, we need to check if it | |
303 | * is really so; aka Router Reachability Probing. | |
304 | * | |
305 | * Router Reachability Probe MUST be rate-limited | |
306 | * to no more than one per minute. | |
307 | */ | |
308 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
309 | return; | |
310 | read_lock_bh(&neigh->lock); | |
311 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 312 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
313 | struct in6_addr mcaddr; |
314 | struct in6_addr *target; | |
315 | ||
316 | neigh->updated = jiffies; | |
317 | read_unlock_bh(&neigh->lock); | |
318 | ||
319 | target = (struct in6_addr *)&neigh->primary_key; | |
320 | addrconf_addr_solict_mult(target, &mcaddr); | |
321 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
322 | } else | |
323 | read_unlock_bh(&neigh->lock); | |
324 | } | |
325 | #else | |
326 | static inline void rt6_probe(struct rt6_info *rt) | |
327 | { | |
27097255 YH |
328 | } |
329 | #endif | |
330 | ||
1da177e4 | 331 | /* |
554cfb7e | 332 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 333 | */ |
b6f99a21 | 334 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
335 | { |
336 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 337 | if (!oif || dev->ifindex == oif) |
554cfb7e | 338 | return 2; |
161980f4 DM |
339 | if ((dev->flags & IFF_LOOPBACK) && |
340 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
341 | return 1; | |
342 | return 0; | |
554cfb7e | 343 | } |
1da177e4 | 344 | |
b6f99a21 | 345 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 346 | { |
554cfb7e | 347 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 348 | int m; |
4d0c5911 YH |
349 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
350 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
351 | m = 1; | |
352 | else if (neigh) { | |
554cfb7e YH |
353 | read_lock_bh(&neigh->lock); |
354 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 355 | m = 2; |
398bcbeb YH |
356 | #ifdef CONFIG_IPV6_ROUTER_PREF |
357 | else if (neigh->nud_state & NUD_FAILED) | |
358 | m = 0; | |
359 | #endif | |
360 | else | |
ea73ee23 | 361 | m = 1; |
554cfb7e | 362 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
363 | } else |
364 | m = 0; | |
554cfb7e | 365 | return m; |
1da177e4 LT |
366 | } |
367 | ||
554cfb7e YH |
368 | static int rt6_score_route(struct rt6_info *rt, int oif, |
369 | int strict) | |
1da177e4 | 370 | { |
4d0c5911 | 371 | int m, n; |
1ab1457c | 372 | |
4d0c5911 | 373 | m = rt6_check_dev(rt, oif); |
77d16f45 | 374 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 375 | return -1; |
ebacaaa0 YH |
376 | #ifdef CONFIG_IPV6_ROUTER_PREF |
377 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
378 | #endif | |
4d0c5911 | 379 | n = rt6_check_neigh(rt); |
557e92ef | 380 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
381 | return -1; |
382 | return m; | |
383 | } | |
384 | ||
f11e6659 DM |
385 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
386 | int *mpri, struct rt6_info *match) | |
554cfb7e | 387 | { |
f11e6659 DM |
388 | int m; |
389 | ||
390 | if (rt6_check_expired(rt)) | |
391 | goto out; | |
392 | ||
393 | m = rt6_score_route(rt, oif, strict); | |
394 | if (m < 0) | |
395 | goto out; | |
396 | ||
397 | if (m > *mpri) { | |
398 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
399 | rt6_probe(match); | |
400 | *mpri = m; | |
401 | match = rt; | |
402 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
403 | rt6_probe(rt); | |
404 | } | |
405 | ||
406 | out: | |
407 | return match; | |
408 | } | |
409 | ||
410 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
411 | struct rt6_info *rr_head, | |
412 | u32 metric, int oif, int strict) | |
413 | { | |
414 | struct rt6_info *rt, *match; | |
554cfb7e | 415 | int mpri = -1; |
1da177e4 | 416 | |
f11e6659 DM |
417 | match = NULL; |
418 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 419 | rt = rt->dst.rt6_next) |
f11e6659 DM |
420 | match = find_match(rt, oif, strict, &mpri, match); |
421 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 422 | rt = rt->dst.rt6_next) |
f11e6659 | 423 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 424 | |
f11e6659 DM |
425 | return match; |
426 | } | |
1da177e4 | 427 | |
f11e6659 DM |
428 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
429 | { | |
430 | struct rt6_info *match, *rt0; | |
8ed67789 | 431 | struct net *net; |
1da177e4 | 432 | |
f11e6659 | 433 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 434 | __func__, fn->leaf, oif); |
554cfb7e | 435 | |
f11e6659 DM |
436 | rt0 = fn->rr_ptr; |
437 | if (!rt0) | |
438 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 439 | |
f11e6659 | 440 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 441 | |
554cfb7e | 442 | if (!match && |
f11e6659 | 443 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 444 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 445 | |
554cfb7e | 446 | /* no entries matched; do round-robin */ |
f11e6659 DM |
447 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
448 | next = fn->leaf; | |
449 | ||
450 | if (next != rt0) | |
451 | fn->rr_ptr = next; | |
1da177e4 | 452 | } |
1da177e4 | 453 | |
f11e6659 | 454 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 455 | __func__, match); |
1da177e4 | 456 | |
c346dca1 | 457 | net = dev_net(rt0->rt6i_dev); |
a02cec21 | 458 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
459 | } |
460 | ||
70ceb4f5 YH |
461 | #ifdef CONFIG_IPV6_ROUTE_INFO |
462 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
463 | struct in6_addr *gwaddr) | |
464 | { | |
c346dca1 | 465 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
466 | struct route_info *rinfo = (struct route_info *) opt; |
467 | struct in6_addr prefix_buf, *prefix; | |
468 | unsigned int pref; | |
4bed72e4 | 469 | unsigned long lifetime; |
70ceb4f5 YH |
470 | struct rt6_info *rt; |
471 | ||
472 | if (len < sizeof(struct route_info)) { | |
473 | return -EINVAL; | |
474 | } | |
475 | ||
476 | /* Sanity check for prefix_len and length */ | |
477 | if (rinfo->length > 3) { | |
478 | return -EINVAL; | |
479 | } else if (rinfo->prefix_len > 128) { | |
480 | return -EINVAL; | |
481 | } else if (rinfo->prefix_len > 64) { | |
482 | if (rinfo->length < 2) { | |
483 | return -EINVAL; | |
484 | } | |
485 | } else if (rinfo->prefix_len > 0) { | |
486 | if (rinfo->length < 1) { | |
487 | return -EINVAL; | |
488 | } | |
489 | } | |
490 | ||
491 | pref = rinfo->route_pref; | |
492 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 493 | return -EINVAL; |
70ceb4f5 | 494 | |
4bed72e4 | 495 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
496 | |
497 | if (rinfo->length == 3) | |
498 | prefix = (struct in6_addr *)rinfo->prefix; | |
499 | else { | |
500 | /* this function is safe */ | |
501 | ipv6_addr_prefix(&prefix_buf, | |
502 | (struct in6_addr *)rinfo->prefix, | |
503 | rinfo->prefix_len); | |
504 | prefix = &prefix_buf; | |
505 | } | |
506 | ||
efa2cea0 DL |
507 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
508 | dev->ifindex); | |
70ceb4f5 YH |
509 | |
510 | if (rt && !lifetime) { | |
e0a1ad73 | 511 | ip6_del_rt(rt); |
70ceb4f5 YH |
512 | rt = NULL; |
513 | } | |
514 | ||
515 | if (!rt && lifetime) | |
efa2cea0 | 516 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
517 | pref); |
518 | else if (rt) | |
519 | rt->rt6i_flags = RTF_ROUTEINFO | | |
520 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
521 | ||
522 | if (rt) { | |
4bed72e4 | 523 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
524 | rt->rt6i_flags &= ~RTF_EXPIRES; |
525 | } else { | |
526 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
527 | rt->rt6i_flags |= RTF_EXPIRES; | |
528 | } | |
d8d1f30b | 529 | dst_release(&rt->dst); |
70ceb4f5 YH |
530 | } |
531 | return 0; | |
532 | } | |
533 | #endif | |
534 | ||
8ed67789 | 535 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 536 | do { \ |
8ed67789 | 537 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 538 | struct fib6_node *pn; \ |
e0eda7bb | 539 | while (1) { \ |
982f56f3 YH |
540 | if (fn->fn_flags & RTN_TL_ROOT) \ |
541 | goto out; \ | |
542 | pn = fn->parent; \ | |
543 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 544 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
545 | else \ |
546 | fn = pn; \ | |
547 | if (fn->fn_flags & RTN_RTINFO) \ | |
548 | goto restart; \ | |
c71099ac | 549 | } \ |
c71099ac | 550 | } \ |
982f56f3 | 551 | } while(0) |
c71099ac | 552 | |
8ed67789 DL |
553 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
554 | struct fib6_table *table, | |
c71099ac | 555 | struct flowi *fl, int flags) |
1da177e4 LT |
556 | { |
557 | struct fib6_node *fn; | |
558 | struct rt6_info *rt; | |
559 | ||
c71099ac TG |
560 | read_lock_bh(&table->tb6_lock); |
561 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
562 | restart: | |
563 | rt = fn->leaf; | |
dd3abc4e | 564 | rt = rt6_device_match(net, rt, &fl->fl6_src, fl->oif, flags); |
8ed67789 | 565 | BACKTRACK(net, &fl->fl6_src); |
c71099ac | 566 | out: |
d8d1f30b | 567 | dst_use(&rt->dst, jiffies); |
c71099ac | 568 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
569 | return rt; |
570 | ||
571 | } | |
572 | ||
9acd9f3a YH |
573 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
574 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
575 | { |
576 | struct flowi fl = { | |
577 | .oif = oif, | |
5811662b | 578 | .fl6_dst = *daddr, |
c71099ac TG |
579 | }; |
580 | struct dst_entry *dst; | |
77d16f45 | 581 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 582 | |
adaa70bb TG |
583 | if (saddr) { |
584 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
585 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
586 | } | |
587 | ||
606a2b48 | 588 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
589 | if (dst->error == 0) |
590 | return (struct rt6_info *) dst; | |
591 | ||
592 | dst_release(dst); | |
593 | ||
1da177e4 LT |
594 | return NULL; |
595 | } | |
596 | ||
7159039a YH |
597 | EXPORT_SYMBOL(rt6_lookup); |
598 | ||
c71099ac | 599 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
600 | It takes new route entry, the addition fails by any reason the |
601 | route is freed. In any case, if caller does not hold it, it may | |
602 | be destroyed. | |
603 | */ | |
604 | ||
86872cb5 | 605 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
606 | { |
607 | int err; | |
c71099ac | 608 | struct fib6_table *table; |
1da177e4 | 609 | |
c71099ac TG |
610 | table = rt->rt6i_table; |
611 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 612 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 613 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
614 | |
615 | return err; | |
616 | } | |
617 | ||
40e22e8f TG |
618 | int ip6_ins_rt(struct rt6_info *rt) |
619 | { | |
4d1169c1 | 620 | struct nl_info info = { |
c346dca1 | 621 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 622 | }; |
528c4ceb | 623 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
624 | } |
625 | ||
95a9a5ba YH |
626 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
627 | struct in6_addr *saddr) | |
1da177e4 | 628 | { |
1da177e4 LT |
629 | struct rt6_info *rt; |
630 | ||
631 | /* | |
632 | * Clone the route. | |
633 | */ | |
634 | ||
635 | rt = ip6_rt_copy(ort); | |
636 | ||
637 | if (rt) { | |
14deae41 DM |
638 | struct neighbour *neigh; |
639 | int attempts = !in_softirq(); | |
640 | ||
58c4fb86 YH |
641 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
642 | if (rt->rt6i_dst.plen != 128 && | |
643 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
644 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 645 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 646 | } |
1da177e4 | 647 | |
58c4fb86 | 648 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
649 | rt->rt6i_dst.plen = 128; |
650 | rt->rt6i_flags |= RTF_CACHE; | |
d8d1f30b | 651 | rt->dst.flags |= DST_HOST; |
1da177e4 LT |
652 | |
653 | #ifdef CONFIG_IPV6_SUBTREES | |
654 | if (rt->rt6i_src.plen && saddr) { | |
655 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
656 | rt->rt6i_src.plen = 128; | |
657 | } | |
658 | #endif | |
659 | ||
14deae41 DM |
660 | retry: |
661 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
662 | if (IS_ERR(neigh)) { | |
663 | struct net *net = dev_net(rt->rt6i_dev); | |
664 | int saved_rt_min_interval = | |
665 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
666 | int saved_rt_elasticity = | |
667 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
668 | ||
669 | if (attempts-- > 0) { | |
670 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
671 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
672 | ||
86393e52 | 673 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
674 | |
675 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
676 | saved_rt_elasticity; | |
677 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
678 | saved_rt_min_interval; | |
679 | goto retry; | |
680 | } | |
681 | ||
682 | if (net_ratelimit()) | |
683 | printk(KERN_WARNING | |
7e1b33e5 | 684 | "ipv6: Neighbour table overflow.\n"); |
d8d1f30b | 685 | dst_free(&rt->dst); |
14deae41 DM |
686 | return NULL; |
687 | } | |
688 | rt->rt6i_nexthop = neigh; | |
1da177e4 | 689 | |
95a9a5ba | 690 | } |
1da177e4 | 691 | |
95a9a5ba YH |
692 | return rt; |
693 | } | |
1da177e4 | 694 | |
299d9939 YH |
695 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
696 | { | |
697 | struct rt6_info *rt = ip6_rt_copy(ort); | |
698 | if (rt) { | |
699 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
700 | rt->rt6i_dst.plen = 128; | |
701 | rt->rt6i_flags |= RTF_CACHE; | |
d8d1f30b | 702 | rt->dst.flags |= DST_HOST; |
299d9939 YH |
703 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); |
704 | } | |
705 | return rt; | |
706 | } | |
707 | ||
8ed67789 DL |
708 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
709 | struct flowi *fl, int flags) | |
1da177e4 LT |
710 | { |
711 | struct fib6_node *fn; | |
519fbd87 | 712 | struct rt6_info *rt, *nrt; |
c71099ac | 713 | int strict = 0; |
1da177e4 | 714 | int attempts = 3; |
519fbd87 | 715 | int err; |
53b7997f | 716 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 717 | |
77d16f45 | 718 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
719 | |
720 | relookup: | |
c71099ac | 721 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 722 | |
8238dd06 | 723 | restart_2: |
c71099ac | 724 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
725 | |
726 | restart: | |
4acad72d | 727 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 DL |
728 | |
729 | BACKTRACK(net, &fl->fl6_src); | |
730 | if (rt == net->ipv6.ip6_null_entry || | |
8238dd06 | 731 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 732 | goto out; |
1da177e4 | 733 | |
d8d1f30b | 734 | dst_hold(&rt->dst); |
c71099ac | 735 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 736 | |
519fbd87 | 737 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 738 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
739 | else { |
740 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 741 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
742 | #else |
743 | goto out2; | |
744 | #endif | |
745 | } | |
e40cf353 | 746 | |
d8d1f30b | 747 | dst_release(&rt->dst); |
8ed67789 | 748 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 749 | |
d8d1f30b | 750 | dst_hold(&rt->dst); |
519fbd87 | 751 | if (nrt) { |
40e22e8f | 752 | err = ip6_ins_rt(nrt); |
519fbd87 | 753 | if (!err) |
1da177e4 | 754 | goto out2; |
1da177e4 | 755 | } |
1da177e4 | 756 | |
519fbd87 YH |
757 | if (--attempts <= 0) |
758 | goto out2; | |
759 | ||
760 | /* | |
c71099ac | 761 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
762 | * released someone could insert this route. Relookup. |
763 | */ | |
d8d1f30b | 764 | dst_release(&rt->dst); |
519fbd87 YH |
765 | goto relookup; |
766 | ||
767 | out: | |
8238dd06 YH |
768 | if (reachable) { |
769 | reachable = 0; | |
770 | goto restart_2; | |
771 | } | |
d8d1f30b | 772 | dst_hold(&rt->dst); |
c71099ac | 773 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 774 | out2: |
d8d1f30b CG |
775 | rt->dst.lastuse = jiffies; |
776 | rt->dst.__use++; | |
c71099ac TG |
777 | |
778 | return rt; | |
1da177e4 LT |
779 | } |
780 | ||
8ed67789 | 781 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4acad72d PE |
782 | struct flowi *fl, int flags) |
783 | { | |
8ed67789 | 784 | return ip6_pol_route(net, table, fl->iif, fl, flags); |
4acad72d PE |
785 | } |
786 | ||
c71099ac TG |
787 | void ip6_route_input(struct sk_buff *skb) |
788 | { | |
0660e03f | 789 | struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 790 | struct net *net = dev_net(skb->dev); |
adaa70bb | 791 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
792 | struct flowi fl = { |
793 | .iif = skb->dev->ifindex, | |
5811662b CG |
794 | .fl6_dst = iph->daddr, |
795 | .fl6_src = iph->saddr, | |
796 | .fl6_flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, | |
1ab1457c | 797 | .mark = skb->mark, |
c71099ac TG |
798 | .proto = iph->nexthdr, |
799 | }; | |
adaa70bb | 800 | |
1d6e55f1 | 801 | if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG) |
adaa70bb | 802 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 803 | |
adf30907 | 804 | skb_dst_set(skb, fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input)); |
c71099ac TG |
805 | } |
806 | ||
8ed67789 | 807 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
c71099ac | 808 | struct flowi *fl, int flags) |
1da177e4 | 809 | { |
8ed67789 | 810 | return ip6_pol_route(net, table, fl->oif, fl, flags); |
c71099ac TG |
811 | } |
812 | ||
4591db4f DL |
813 | struct dst_entry * ip6_route_output(struct net *net, struct sock *sk, |
814 | struct flowi *fl) | |
c71099ac TG |
815 | { |
816 | int flags = 0; | |
817 | ||
6057fd78 | 818 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl->fl6_dst)) |
77d16f45 | 819 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 820 | |
adaa70bb TG |
821 | if (!ipv6_addr_any(&fl->fl6_src)) |
822 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
0c9a2ac1 YH |
823 | else if (sk) |
824 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 825 | |
4591db4f | 826 | return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
827 | } |
828 | ||
7159039a | 829 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 830 | |
14e50e57 DM |
831 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
832 | { | |
833 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
834 | struct rt6_info *rt = (struct rt6_info *) | |
835 | dst_alloc(&ip6_dst_blackhole_ops); | |
836 | struct dst_entry *new = NULL; | |
837 | ||
838 | if (rt) { | |
d8d1f30b | 839 | new = &rt->dst; |
14e50e57 DM |
840 | |
841 | atomic_set(&new->__refcnt, 1); | |
842 | new->__use = 1; | |
352e512c HX |
843 | new->input = dst_discard; |
844 | new->output = dst_discard; | |
14e50e57 | 845 | |
defb3519 | 846 | dst_copy_metrics(new, &ort->dst); |
d8d1f30b | 847 | new->dev = ort->dst.dev; |
14e50e57 DM |
848 | if (new->dev) |
849 | dev_hold(new->dev); | |
850 | rt->rt6i_idev = ort->rt6i_idev; | |
851 | if (rt->rt6i_idev) | |
852 | in6_dev_hold(rt->rt6i_idev); | |
853 | rt->rt6i_expires = 0; | |
854 | ||
855 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
856 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
857 | rt->rt6i_metric = 0; | |
858 | ||
859 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
860 | #ifdef CONFIG_IPV6_SUBTREES | |
861 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
862 | #endif | |
863 | ||
864 | dst_free(new); | |
865 | } | |
866 | ||
867 | dst_release(*dstp); | |
868 | *dstp = new; | |
a02cec21 | 869 | return new ? 0 : -ENOMEM; |
14e50e57 DM |
870 | } |
871 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
872 | ||
1da177e4 LT |
873 | /* |
874 | * Destination cache support functions | |
875 | */ | |
876 | ||
877 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
878 | { | |
879 | struct rt6_info *rt; | |
880 | ||
881 | rt = (struct rt6_info *) dst; | |
882 | ||
10414444 | 883 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) |
1da177e4 LT |
884 | return dst; |
885 | ||
886 | return NULL; | |
887 | } | |
888 | ||
889 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
890 | { | |
891 | struct rt6_info *rt = (struct rt6_info *) dst; | |
892 | ||
893 | if (rt) { | |
54c1a859 YH |
894 | if (rt->rt6i_flags & RTF_CACHE) { |
895 | if (rt6_check_expired(rt)) { | |
896 | ip6_del_rt(rt); | |
897 | dst = NULL; | |
898 | } | |
899 | } else { | |
1da177e4 | 900 | dst_release(dst); |
54c1a859 YH |
901 | dst = NULL; |
902 | } | |
1da177e4 | 903 | } |
54c1a859 | 904 | return dst; |
1da177e4 LT |
905 | } |
906 | ||
907 | static void ip6_link_failure(struct sk_buff *skb) | |
908 | { | |
909 | struct rt6_info *rt; | |
910 | ||
3ffe533c | 911 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 912 | |
adf30907 | 913 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 LT |
914 | if (rt) { |
915 | if (rt->rt6i_flags&RTF_CACHE) { | |
d8d1f30b | 916 | dst_set_expires(&rt->dst, 0); |
1da177e4 LT |
917 | rt->rt6i_flags |= RTF_EXPIRES; |
918 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
919 | rt->rt6i_node->fn_sernum = -1; | |
920 | } | |
921 | } | |
922 | ||
923 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
924 | { | |
925 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
926 | ||
927 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
928 | rt6->rt6i_flags |= RTF_MODIFIED; | |
929 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 930 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 931 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
932 | features |= RTAX_FEATURE_ALLFRAG; |
933 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 934 | } |
defb3519 | 935 | dst_metric_set(dst, RTAX_MTU, mtu); |
8d71740c | 936 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
937 | } |
938 | } | |
939 | ||
1da177e4 LT |
940 | static int ipv6_get_mtu(struct net_device *dev); |
941 | ||
0dbaee3b | 942 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 943 | { |
0dbaee3b DM |
944 | struct net_device *dev = dst->dev; |
945 | unsigned int mtu = dst_mtu(dst); | |
946 | struct net *net = dev_net(dev); | |
947 | ||
1da177e4 LT |
948 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
949 | ||
5578689a DL |
950 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
951 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
952 | |
953 | /* | |
1ab1457c YH |
954 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
955 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
956 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
957 | * rely only on pmtu discovery" |
958 | */ | |
959 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
960 | mtu = IPV6_MAXPLEN; | |
961 | return mtu; | |
962 | } | |
963 | ||
3b00944c YH |
964 | static struct dst_entry *icmp6_dst_gc_list; |
965 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 966 | |
3b00944c | 967 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 968 | struct neighbour *neigh, |
9acd9f3a | 969 | const struct in6_addr *addr) |
1da177e4 LT |
970 | { |
971 | struct rt6_info *rt; | |
972 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 973 | struct net *net = dev_net(dev); |
1da177e4 LT |
974 | |
975 | if (unlikely(idev == NULL)) | |
976 | return NULL; | |
977 | ||
86393e52 | 978 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
979 | if (unlikely(rt == NULL)) { |
980 | in6_dev_put(idev); | |
981 | goto out; | |
982 | } | |
983 | ||
984 | dev_hold(dev); | |
985 | if (neigh) | |
986 | neigh_hold(neigh); | |
14deae41 | 987 | else { |
1da177e4 | 988 | neigh = ndisc_get_neigh(dev, addr); |
14deae41 DM |
989 | if (IS_ERR(neigh)) |
990 | neigh = NULL; | |
991 | } | |
1da177e4 LT |
992 | |
993 | rt->rt6i_dev = dev; | |
994 | rt->rt6i_idev = idev; | |
995 | rt->rt6i_nexthop = neigh; | |
d8d1f30b | 996 | atomic_set(&rt->dst.__refcnt, 1); |
defb3519 DM |
997 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255); |
998 | dst_metric_set(&rt->dst, RTAX_MTU, ipv6_get_mtu(rt->rt6i_dev)); | |
d8d1f30b | 999 | rt->dst.output = ip6_output; |
1da177e4 LT |
1000 | |
1001 | #if 0 /* there's no chance to use these for ndisc */ | |
d8d1f30b | 1002 | rt->dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
1ab1457c | 1003 | ? DST_HOST |
1da177e4 LT |
1004 | : 0; |
1005 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1006 | rt->rt6i_dst.plen = 128; | |
1007 | #endif | |
1008 | ||
3b00944c | 1009 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1010 | rt->dst.next = icmp6_dst_gc_list; |
1011 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1012 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1013 | |
5578689a | 1014 | fib6_force_start_gc(net); |
1da177e4 LT |
1015 | |
1016 | out: | |
d8d1f30b | 1017 | return &rt->dst; |
1da177e4 LT |
1018 | } |
1019 | ||
3d0f24a7 | 1020 | int icmp6_dst_gc(void) |
1da177e4 LT |
1021 | { |
1022 | struct dst_entry *dst, *next, **pprev; | |
3d0f24a7 | 1023 | int more = 0; |
1da177e4 LT |
1024 | |
1025 | next = NULL; | |
5d0bbeeb | 1026 | |
3b00944c YH |
1027 | spin_lock_bh(&icmp6_dst_lock); |
1028 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1029 | |
1da177e4 LT |
1030 | while ((dst = *pprev) != NULL) { |
1031 | if (!atomic_read(&dst->__refcnt)) { | |
1032 | *pprev = dst->next; | |
1033 | dst_free(dst); | |
1da177e4 LT |
1034 | } else { |
1035 | pprev = &dst->next; | |
3d0f24a7 | 1036 | ++more; |
1da177e4 LT |
1037 | } |
1038 | } | |
1039 | ||
3b00944c | 1040 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1041 | |
3d0f24a7 | 1042 | return more; |
1da177e4 LT |
1043 | } |
1044 | ||
1e493d19 DM |
1045 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1046 | void *arg) | |
1047 | { | |
1048 | struct dst_entry *dst, **pprev; | |
1049 | ||
1050 | spin_lock_bh(&icmp6_dst_lock); | |
1051 | pprev = &icmp6_dst_gc_list; | |
1052 | while ((dst = *pprev) != NULL) { | |
1053 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1054 | if (func(rt, arg)) { | |
1055 | *pprev = dst->next; | |
1056 | dst_free(dst); | |
1057 | } else { | |
1058 | pprev = &dst->next; | |
1059 | } | |
1060 | } | |
1061 | spin_unlock_bh(&icmp6_dst_lock); | |
1062 | } | |
1063 | ||
569d3645 | 1064 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1065 | { |
1da177e4 | 1066 | unsigned long now = jiffies; |
86393e52 | 1067 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1068 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1069 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1070 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1071 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1072 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1073 | int entries; |
7019b78e | 1074 | |
fc66f95c | 1075 | entries = dst_entries_get_fast(ops); |
7019b78e | 1076 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1077 | entries <= rt_max_size) |
1da177e4 LT |
1078 | goto out; |
1079 | ||
6891a346 BT |
1080 | net->ipv6.ip6_rt_gc_expire++; |
1081 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1082 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1083 | entries = dst_entries_get_slow(ops); |
1084 | if (entries < ops->gc_thresh) | |
7019b78e | 1085 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1086 | out: |
7019b78e | 1087 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1088 | return entries > rt_max_size; |
1da177e4 LT |
1089 | } |
1090 | ||
1091 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1092 | but results in cleaner routing tables. | |
1093 | ||
1094 | Remove it only when all the things will work! | |
1095 | */ | |
1096 | ||
1097 | static int ipv6_get_mtu(struct net_device *dev) | |
1098 | { | |
1099 | int mtu = IPV6_MIN_MTU; | |
1100 | struct inet6_dev *idev; | |
1101 | ||
c68f24cc ED |
1102 | rcu_read_lock(); |
1103 | idev = __in6_dev_get(dev); | |
1104 | if (idev) | |
1da177e4 | 1105 | mtu = idev->cnf.mtu6; |
c68f24cc | 1106 | rcu_read_unlock(); |
1da177e4 LT |
1107 | return mtu; |
1108 | } | |
1109 | ||
6b75d090 | 1110 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1111 | { |
5170ae82 | 1112 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1113 | if (hoplimit == 0) { |
6b75d090 | 1114 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1115 | struct inet6_dev *idev; |
1116 | ||
1117 | rcu_read_lock(); | |
1118 | idev = __in6_dev_get(dev); | |
1119 | if (idev) | |
6b75d090 | 1120 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1121 | else |
53b7997f | 1122 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1123 | rcu_read_unlock(); |
1da177e4 LT |
1124 | } |
1125 | return hoplimit; | |
1126 | } | |
abbf46ae | 1127 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1128 | |
1129 | /* | |
1130 | * | |
1131 | */ | |
1132 | ||
86872cb5 | 1133 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1134 | { |
1135 | int err; | |
5578689a | 1136 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1137 | struct rt6_info *rt = NULL; |
1138 | struct net_device *dev = NULL; | |
1139 | struct inet6_dev *idev = NULL; | |
c71099ac | 1140 | struct fib6_table *table; |
1da177e4 LT |
1141 | int addr_type; |
1142 | ||
86872cb5 | 1143 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1144 | return -EINVAL; |
1145 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1146 | if (cfg->fc_src_len) |
1da177e4 LT |
1147 | return -EINVAL; |
1148 | #endif | |
86872cb5 | 1149 | if (cfg->fc_ifindex) { |
1da177e4 | 1150 | err = -ENODEV; |
5578689a | 1151 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1152 | if (!dev) |
1153 | goto out; | |
1154 | idev = in6_dev_get(dev); | |
1155 | if (!idev) | |
1156 | goto out; | |
1157 | } | |
1158 | ||
86872cb5 TG |
1159 | if (cfg->fc_metric == 0) |
1160 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1161 | |
5578689a | 1162 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1163 | if (table == NULL) { |
1164 | err = -ENOBUFS; | |
1165 | goto out; | |
1166 | } | |
1167 | ||
86393e52 | 1168 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1169 | |
1170 | if (rt == NULL) { | |
1171 | err = -ENOMEM; | |
1172 | goto out; | |
1173 | } | |
1174 | ||
d8d1f30b | 1175 | rt->dst.obsolete = -1; |
6f704992 YH |
1176 | rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ? |
1177 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : | |
1178 | 0; | |
1da177e4 | 1179 | |
86872cb5 TG |
1180 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1181 | cfg->fc_protocol = RTPROT_BOOT; | |
1182 | rt->rt6i_protocol = cfg->fc_protocol; | |
1183 | ||
1184 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1185 | |
1186 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1187 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1188 | else if (cfg->fc_flags & RTF_LOCAL) |
1189 | rt->dst.input = ip6_input; | |
1da177e4 | 1190 | else |
d8d1f30b | 1191 | rt->dst.input = ip6_forward; |
1da177e4 | 1192 | |
d8d1f30b | 1193 | rt->dst.output = ip6_output; |
1da177e4 | 1194 | |
86872cb5 TG |
1195 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1196 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1197 | if (rt->rt6i_dst.plen == 128) |
d8d1f30b | 1198 | rt->dst.flags = DST_HOST; |
1da177e4 LT |
1199 | |
1200 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1201 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1202 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1203 | #endif |
1204 | ||
86872cb5 | 1205 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1206 | |
1207 | /* We cannot add true routes via loopback here, | |
1208 | they would result in kernel looping; promote them to reject routes | |
1209 | */ | |
86872cb5 | 1210 | if ((cfg->fc_flags & RTF_REJECT) || |
ab79ad14 MŻ |
1211 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK) |
1212 | && !(cfg->fc_flags&RTF_LOCAL))) { | |
1da177e4 | 1213 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1214 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1215 | if (dev) { |
1216 | dev_put(dev); | |
1217 | in6_dev_put(idev); | |
1218 | } | |
5578689a | 1219 | dev = net->loopback_dev; |
1da177e4 LT |
1220 | dev_hold(dev); |
1221 | idev = in6_dev_get(dev); | |
1222 | if (!idev) { | |
1223 | err = -ENODEV; | |
1224 | goto out; | |
1225 | } | |
1226 | } | |
d8d1f30b CG |
1227 | rt->dst.output = ip6_pkt_discard_out; |
1228 | rt->dst.input = ip6_pkt_discard; | |
1229 | rt->dst.error = -ENETUNREACH; | |
1da177e4 LT |
1230 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
1231 | goto install_route; | |
1232 | } | |
1233 | ||
86872cb5 | 1234 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1235 | struct in6_addr *gw_addr; |
1236 | int gwa_type; | |
1237 | ||
86872cb5 TG |
1238 | gw_addr = &cfg->fc_gateway; |
1239 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1240 | gwa_type = ipv6_addr_type(gw_addr); |
1241 | ||
1242 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1243 | struct rt6_info *grt; | |
1244 | ||
1245 | /* IPv6 strictly inhibits using not link-local | |
1246 | addresses as nexthop address. | |
1247 | Otherwise, router will not able to send redirects. | |
1248 | It is very good, but in some (rare!) circumstances | |
1249 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1250 | some exceptions. --ANK | |
1251 | */ | |
1252 | err = -EINVAL; | |
1253 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1254 | goto out; | |
1255 | ||
5578689a | 1256 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1257 | |
1258 | err = -EHOSTUNREACH; | |
1259 | if (grt == NULL) | |
1260 | goto out; | |
1261 | if (dev) { | |
1262 | if (dev != grt->rt6i_dev) { | |
d8d1f30b | 1263 | dst_release(&grt->dst); |
1da177e4 LT |
1264 | goto out; |
1265 | } | |
1266 | } else { | |
1267 | dev = grt->rt6i_dev; | |
1268 | idev = grt->rt6i_idev; | |
1269 | dev_hold(dev); | |
1270 | in6_dev_hold(grt->rt6i_idev); | |
1271 | } | |
1272 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1273 | err = 0; | |
d8d1f30b | 1274 | dst_release(&grt->dst); |
1da177e4 LT |
1275 | |
1276 | if (err) | |
1277 | goto out; | |
1278 | } | |
1279 | err = -EINVAL; | |
1280 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1281 | goto out; | |
1282 | } | |
1283 | ||
1284 | err = -ENODEV; | |
1285 | if (dev == NULL) | |
1286 | goto out; | |
1287 | ||
86872cb5 | 1288 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1289 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1290 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1291 | err = PTR_ERR(rt->rt6i_nexthop); | |
1292 | rt->rt6i_nexthop = NULL; | |
1293 | goto out; | |
1294 | } | |
1295 | } | |
1296 | ||
86872cb5 | 1297 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1298 | |
1299 | install_route: | |
86872cb5 TG |
1300 | if (cfg->fc_mx) { |
1301 | struct nlattr *nla; | |
1302 | int remaining; | |
1303 | ||
1304 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1305 | int type = nla_type(nla); |
86872cb5 TG |
1306 | |
1307 | if (type) { | |
1308 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1309 | err = -EINVAL; |
1310 | goto out; | |
1311 | } | |
86872cb5 | 1312 | |
defb3519 | 1313 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1314 | } |
1da177e4 LT |
1315 | } |
1316 | } | |
1317 | ||
d8d1f30b | 1318 | if (!dst_mtu(&rt->dst)) |
defb3519 | 1319 | dst_metric_set(&rt->dst, RTAX_MTU, ipv6_get_mtu(dev)); |
d8d1f30b | 1320 | rt->dst.dev = dev; |
1da177e4 | 1321 | rt->rt6i_idev = idev; |
c71099ac | 1322 | rt->rt6i_table = table; |
63152fc0 | 1323 | |
c346dca1 | 1324 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1325 | |
86872cb5 | 1326 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1327 | |
1328 | out: | |
1329 | if (dev) | |
1330 | dev_put(dev); | |
1331 | if (idev) | |
1332 | in6_dev_put(idev); | |
1333 | if (rt) | |
d8d1f30b | 1334 | dst_free(&rt->dst); |
1da177e4 LT |
1335 | return err; |
1336 | } | |
1337 | ||
86872cb5 | 1338 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1339 | { |
1340 | int err; | |
c71099ac | 1341 | struct fib6_table *table; |
c346dca1 | 1342 | struct net *net = dev_net(rt->rt6i_dev); |
1da177e4 | 1343 | |
8ed67789 | 1344 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1345 | return -ENOENT; |
1346 | ||
c71099ac TG |
1347 | table = rt->rt6i_table; |
1348 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1349 | |
86872cb5 | 1350 | err = fib6_del(rt, info); |
d8d1f30b | 1351 | dst_release(&rt->dst); |
1da177e4 | 1352 | |
c71099ac | 1353 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1354 | |
1355 | return err; | |
1356 | } | |
1357 | ||
e0a1ad73 TG |
1358 | int ip6_del_rt(struct rt6_info *rt) |
1359 | { | |
4d1169c1 | 1360 | struct nl_info info = { |
c346dca1 | 1361 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 1362 | }; |
528c4ceb | 1363 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1364 | } |
1365 | ||
86872cb5 | 1366 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1367 | { |
c71099ac | 1368 | struct fib6_table *table; |
1da177e4 LT |
1369 | struct fib6_node *fn; |
1370 | struct rt6_info *rt; | |
1371 | int err = -ESRCH; | |
1372 | ||
5578689a | 1373 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1374 | if (table == NULL) |
1375 | return err; | |
1376 | ||
1377 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1378 | |
c71099ac | 1379 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1380 | &cfg->fc_dst, cfg->fc_dst_len, |
1381 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1382 | |
1da177e4 | 1383 | if (fn) { |
d8d1f30b | 1384 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1385 | if (cfg->fc_ifindex && |
1da177e4 | 1386 | (rt->rt6i_dev == NULL || |
86872cb5 | 1387 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1388 | continue; |
86872cb5 TG |
1389 | if (cfg->fc_flags & RTF_GATEWAY && |
1390 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1391 | continue; |
86872cb5 | 1392 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1393 | continue; |
d8d1f30b | 1394 | dst_hold(&rt->dst); |
c71099ac | 1395 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1396 | |
86872cb5 | 1397 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1398 | } |
1399 | } | |
c71099ac | 1400 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1401 | |
1402 | return err; | |
1403 | } | |
1404 | ||
1405 | /* | |
1406 | * Handle redirects | |
1407 | */ | |
a6279458 YH |
1408 | struct ip6rd_flowi { |
1409 | struct flowi fl; | |
1410 | struct in6_addr gateway; | |
1411 | }; | |
1412 | ||
8ed67789 DL |
1413 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1414 | struct fib6_table *table, | |
a6279458 YH |
1415 | struct flowi *fl, |
1416 | int flags) | |
1da177e4 | 1417 | { |
a6279458 YH |
1418 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1419 | struct rt6_info *rt; | |
e843b9e1 | 1420 | struct fib6_node *fn; |
c71099ac | 1421 | |
1da177e4 | 1422 | /* |
e843b9e1 YH |
1423 | * Get the "current" route for this destination and |
1424 | * check if the redirect has come from approriate router. | |
1425 | * | |
1426 | * RFC 2461 specifies that redirects should only be | |
1427 | * accepted if they come from the nexthop to the target. | |
1428 | * Due to the way the routes are chosen, this notion | |
1429 | * is a bit fuzzy and one might need to check all possible | |
1430 | * routes. | |
1da177e4 | 1431 | */ |
1da177e4 | 1432 | |
c71099ac | 1433 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1434 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1435 | restart: |
d8d1f30b | 1436 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
e843b9e1 YH |
1437 | /* |
1438 | * Current route is on-link; redirect is always invalid. | |
1439 | * | |
1440 | * Seems, previous statement is not true. It could | |
1441 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1442 | * But then router serving it might decide, that we should | |
1443 | * know truth 8)8) --ANK (980726). | |
1444 | */ | |
1445 | if (rt6_check_expired(rt)) | |
1446 | continue; | |
1447 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1448 | continue; | |
a6279458 | 1449 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1450 | continue; |
a6279458 | 1451 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1452 | continue; |
1453 | break; | |
1454 | } | |
a6279458 | 1455 | |
cb15d9c2 | 1456 | if (!rt) |
8ed67789 DL |
1457 | rt = net->ipv6.ip6_null_entry; |
1458 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1459 | out: |
d8d1f30b | 1460 | dst_hold(&rt->dst); |
a6279458 | 1461 | |
c71099ac | 1462 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1463 | |
a6279458 YH |
1464 | return rt; |
1465 | }; | |
1466 | ||
1467 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1468 | struct in6_addr *src, | |
1469 | struct in6_addr *gateway, | |
1470 | struct net_device *dev) | |
1471 | { | |
adaa70bb | 1472 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1473 | struct net *net = dev_net(dev); |
a6279458 YH |
1474 | struct ip6rd_flowi rdfl = { |
1475 | .fl = { | |
1476 | .oif = dev->ifindex, | |
5811662b CG |
1477 | .fl6_dst = *dest, |
1478 | .fl6_src = *src, | |
a6279458 | 1479 | }, |
a6279458 | 1480 | }; |
adaa70bb | 1481 | |
86c36ce4 BH |
1482 | ipv6_addr_copy(&rdfl.gateway, gateway); |
1483 | ||
adaa70bb TG |
1484 | if (rt6_need_strict(dest)) |
1485 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1486 | |
5578689a | 1487 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1488 | flags, __ip6_route_redirect); |
a6279458 YH |
1489 | } |
1490 | ||
1491 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1492 | struct in6_addr *saddr, | |
1493 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1494 | { | |
1495 | struct rt6_info *rt, *nrt = NULL; | |
1496 | struct netevent_redirect netevent; | |
c346dca1 | 1497 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1498 | |
1499 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1500 | ||
8ed67789 | 1501 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1502 | if (net_ratelimit()) |
1503 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1504 | "for redirect target\n"); | |
a6279458 | 1505 | goto out; |
1da177e4 LT |
1506 | } |
1507 | ||
1da177e4 LT |
1508 | /* |
1509 | * We have finally decided to accept it. | |
1510 | */ | |
1511 | ||
1ab1457c | 1512 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1513 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1514 | NEIGH_UPDATE_F_OVERRIDE| | |
1515 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1516 | NEIGH_UPDATE_F_ISROUTER)) | |
1517 | ); | |
1518 | ||
1519 | /* | |
1520 | * Redirect received -> path was valid. | |
1521 | * Look, redirects are sent only in response to data packets, | |
1522 | * so that this nexthop apparently is reachable. --ANK | |
1523 | */ | |
d8d1f30b | 1524 | dst_confirm(&rt->dst); |
1da177e4 LT |
1525 | |
1526 | /* Duplicate redirect: silently ignore. */ | |
d8d1f30b | 1527 | if (neigh == rt->dst.neighbour) |
1da177e4 LT |
1528 | goto out; |
1529 | ||
1530 | nrt = ip6_rt_copy(rt); | |
1531 | if (nrt == NULL) | |
1532 | goto out; | |
1533 | ||
1534 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1535 | if (on_link) | |
1536 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1537 | ||
1538 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1539 | nrt->rt6i_dst.plen = 128; | |
d8d1f30b | 1540 | nrt->dst.flags |= DST_HOST; |
1da177e4 LT |
1541 | |
1542 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1543 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1544 | /* Reset pmtu, it may be better */ | |
defb3519 | 1545 | dst_metric_set(&nrt->dst, RTAX_MTU, ipv6_get_mtu(neigh->dev)); |
1da177e4 | 1546 | |
40e22e8f | 1547 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1548 | goto out; |
1549 | ||
d8d1f30b CG |
1550 | netevent.old = &rt->dst; |
1551 | netevent.new = &nrt->dst; | |
8d71740c TT |
1552 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1553 | ||
1da177e4 | 1554 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1555 | ip6_del_rt(rt); |
1da177e4 LT |
1556 | return; |
1557 | } | |
1558 | ||
1559 | out: | |
d8d1f30b | 1560 | dst_release(&rt->dst); |
1da177e4 LT |
1561 | } |
1562 | ||
1563 | /* | |
1564 | * Handle ICMP "packet too big" messages | |
1565 | * i.e. Path MTU discovery | |
1566 | */ | |
1567 | ||
ae878ae2 MŻ |
1568 | static void rt6_do_pmtu_disc(struct in6_addr *daddr, struct in6_addr *saddr, |
1569 | struct net *net, u32 pmtu, int ifindex) | |
1da177e4 LT |
1570 | { |
1571 | struct rt6_info *rt, *nrt; | |
1572 | int allfrag = 0; | |
1573 | ||
ae878ae2 | 1574 | rt = rt6_lookup(net, daddr, saddr, ifindex, 0); |
1da177e4 LT |
1575 | if (rt == NULL) |
1576 | return; | |
1577 | ||
d8d1f30b | 1578 | if (pmtu >= dst_mtu(&rt->dst)) |
1da177e4 LT |
1579 | goto out; |
1580 | ||
1581 | if (pmtu < IPV6_MIN_MTU) { | |
1582 | /* | |
1ab1457c | 1583 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1584 | * MTU (1280) and a fragment header should always be included |
1585 | * after a node receiving Too Big message reporting PMTU is | |
1586 | * less than the IPv6 Minimum Link MTU. | |
1587 | */ | |
1588 | pmtu = IPV6_MIN_MTU; | |
1589 | allfrag = 1; | |
1590 | } | |
1591 | ||
1592 | /* New mtu received -> path was valid. | |
1593 | They are sent only in response to data packets, | |
1594 | so that this nexthop apparently is reachable. --ANK | |
1595 | */ | |
d8d1f30b | 1596 | dst_confirm(&rt->dst); |
1da177e4 LT |
1597 | |
1598 | /* Host route. If it is static, it would be better | |
1599 | not to override it, but add new one, so that | |
1600 | when cache entry will expire old pmtu | |
1601 | would return automatically. | |
1602 | */ | |
1603 | if (rt->rt6i_flags & RTF_CACHE) { | |
defb3519 DM |
1604 | dst_metric_set(&rt->dst, RTAX_MTU, pmtu); |
1605 | if (allfrag) { | |
1606 | u32 features = dst_metric(&rt->dst, RTAX_FEATURES); | |
1607 | features |= RTAX_FEATURE_ALLFRAG; | |
1608 | dst_metric_set(&rt->dst, RTAX_FEATURES, features); | |
1609 | } | |
d8d1f30b | 1610 | dst_set_expires(&rt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1611 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1612 | goto out; | |
1613 | } | |
1614 | ||
1615 | /* Network route. | |
1616 | Two cases are possible: | |
1617 | 1. It is connected route. Action: COW | |
1618 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1619 | */ | |
d5315b50 | 1620 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1621 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1622 | else |
1623 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1624 | |
d5315b50 | 1625 | if (nrt) { |
defb3519 DM |
1626 | dst_metric_set(&nrt->dst, RTAX_MTU, pmtu); |
1627 | if (allfrag) { | |
1628 | u32 features = dst_metric(&nrt->dst, RTAX_FEATURES); | |
1629 | features |= RTAX_FEATURE_ALLFRAG; | |
1630 | dst_metric_set(&nrt->dst, RTAX_FEATURES, features); | |
1631 | } | |
a1e78363 YH |
1632 | |
1633 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1634 | * happened within 5 mins, the recommended timer is 10 mins. | |
1635 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1636 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1637 | * and detecting PMTU increase will be automatically happened. | |
1638 | */ | |
d8d1f30b | 1639 | dst_set_expires(&nrt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1640 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1641 | ||
40e22e8f | 1642 | ip6_ins_rt(nrt); |
1da177e4 | 1643 | } |
1da177e4 | 1644 | out: |
d8d1f30b | 1645 | dst_release(&rt->dst); |
1da177e4 LT |
1646 | } |
1647 | ||
ae878ae2 MŻ |
1648 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, |
1649 | struct net_device *dev, u32 pmtu) | |
1650 | { | |
1651 | struct net *net = dev_net(dev); | |
1652 | ||
1653 | /* | |
1654 | * RFC 1981 states that a node "MUST reduce the size of the packets it | |
1655 | * is sending along the path" that caused the Packet Too Big message. | |
1656 | * Since it's not possible in the general case to determine which | |
1657 | * interface was used to send the original packet, we update the MTU | |
1658 | * on the interface that will be used to send future packets. We also | |
1659 | * update the MTU on the interface that received the Packet Too Big in | |
1660 | * case the original packet was forced out that interface with | |
1661 | * SO_BINDTODEVICE or similar. This is the next best thing to the | |
1662 | * correct behaviour, which would be to update the MTU on all | |
1663 | * interfaces. | |
1664 | */ | |
1665 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0); | |
1666 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex); | |
1667 | } | |
1668 | ||
1da177e4 LT |
1669 | /* |
1670 | * Misc support functions | |
1671 | */ | |
1672 | ||
1673 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1674 | { | |
c346dca1 | 1675 | struct net *net = dev_net(ort->rt6i_dev); |
86393e52 | 1676 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1677 | |
1678 | if (rt) { | |
d8d1f30b CG |
1679 | rt->dst.input = ort->dst.input; |
1680 | rt->dst.output = ort->dst.output; | |
1681 | ||
defb3519 | 1682 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b CG |
1683 | rt->dst.error = ort->dst.error; |
1684 | rt->dst.dev = ort->dst.dev; | |
1685 | if (rt->dst.dev) | |
1686 | dev_hold(rt->dst.dev); | |
1da177e4 LT |
1687 | rt->rt6i_idev = ort->rt6i_idev; |
1688 | if (rt->rt6i_idev) | |
1689 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1690 | rt->dst.lastuse = jiffies; |
1da177e4 LT |
1691 | rt->rt6i_expires = 0; |
1692 | ||
1693 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1694 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1695 | rt->rt6i_metric = 0; | |
1696 | ||
1697 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1698 | #ifdef CONFIG_IPV6_SUBTREES | |
1699 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1700 | #endif | |
c71099ac | 1701 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1702 | } |
1703 | return rt; | |
1704 | } | |
1705 | ||
70ceb4f5 | 1706 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1707 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1708 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1709 | struct in6_addr *gwaddr, int ifindex) |
1710 | { | |
1711 | struct fib6_node *fn; | |
1712 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1713 | struct fib6_table *table; |
1714 | ||
efa2cea0 | 1715 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1716 | if (table == NULL) |
1717 | return NULL; | |
70ceb4f5 | 1718 | |
c71099ac TG |
1719 | write_lock_bh(&table->tb6_lock); |
1720 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1721 | if (!fn) |
1722 | goto out; | |
1723 | ||
d8d1f30b | 1724 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
70ceb4f5 YH |
1725 | if (rt->rt6i_dev->ifindex != ifindex) |
1726 | continue; | |
1727 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1728 | continue; | |
1729 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1730 | continue; | |
d8d1f30b | 1731 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1732 | break; |
1733 | } | |
1734 | out: | |
c71099ac | 1735 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1736 | return rt; |
1737 | } | |
1738 | ||
efa2cea0 DL |
1739 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1740 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1741 | struct in6_addr *gwaddr, int ifindex, |
1742 | unsigned pref) | |
1743 | { | |
86872cb5 TG |
1744 | struct fib6_config cfg = { |
1745 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1746 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1747 | .fc_ifindex = ifindex, |
1748 | .fc_dst_len = prefixlen, | |
1749 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1750 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1751 | .fc_nlinfo.pid = 0, |
1752 | .fc_nlinfo.nlh = NULL, | |
1753 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1754 | }; |
1755 | ||
1756 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1757 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1758 | |
e317da96 YH |
1759 | /* We should treat it as a default route if prefix length is 0. */ |
1760 | if (!prefixlen) | |
86872cb5 | 1761 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1762 | |
86872cb5 | 1763 | ip6_route_add(&cfg); |
70ceb4f5 | 1764 | |
efa2cea0 | 1765 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1766 | } |
1767 | #endif | |
1768 | ||
1da177e4 | 1769 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1770 | { |
1da177e4 | 1771 | struct rt6_info *rt; |
c71099ac | 1772 | struct fib6_table *table; |
1da177e4 | 1773 | |
c346dca1 | 1774 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
c71099ac TG |
1775 | if (table == NULL) |
1776 | return NULL; | |
1da177e4 | 1777 | |
c71099ac | 1778 | write_lock_bh(&table->tb6_lock); |
d8d1f30b | 1779 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
1da177e4 | 1780 | if (dev == rt->rt6i_dev && |
045927ff | 1781 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1782 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1783 | break; | |
1784 | } | |
1785 | if (rt) | |
d8d1f30b | 1786 | dst_hold(&rt->dst); |
c71099ac | 1787 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1788 | return rt; |
1789 | } | |
1790 | ||
1791 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1792 | struct net_device *dev, |
1793 | unsigned int pref) | |
1da177e4 | 1794 | { |
86872cb5 TG |
1795 | struct fib6_config cfg = { |
1796 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1797 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1798 | .fc_ifindex = dev->ifindex, |
1799 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1800 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1801 | .fc_nlinfo.pid = 0, |
1802 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1803 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1804 | }; |
1da177e4 | 1805 | |
86872cb5 | 1806 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1807 | |
86872cb5 | 1808 | ip6_route_add(&cfg); |
1da177e4 | 1809 | |
1da177e4 LT |
1810 | return rt6_get_dflt_router(gwaddr, dev); |
1811 | } | |
1812 | ||
7b4da532 | 1813 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1814 | { |
1815 | struct rt6_info *rt; | |
c71099ac TG |
1816 | struct fib6_table *table; |
1817 | ||
1818 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1819 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1820 | if (table == NULL) |
1821 | return; | |
1da177e4 LT |
1822 | |
1823 | restart: | |
c71099ac | 1824 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1825 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1826 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1827 | dst_hold(&rt->dst); |
c71099ac | 1828 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1829 | ip6_del_rt(rt); |
1da177e4 LT |
1830 | goto restart; |
1831 | } | |
1832 | } | |
c71099ac | 1833 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1834 | } |
1835 | ||
5578689a DL |
1836 | static void rtmsg_to_fib6_config(struct net *net, |
1837 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1838 | struct fib6_config *cfg) |
1839 | { | |
1840 | memset(cfg, 0, sizeof(*cfg)); | |
1841 | ||
1842 | cfg->fc_table = RT6_TABLE_MAIN; | |
1843 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1844 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1845 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1846 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1847 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1848 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1849 | ||
5578689a | 1850 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1851 | |
86872cb5 TG |
1852 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1853 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1854 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1855 | } | |
1856 | ||
5578689a | 1857 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1858 | { |
86872cb5 | 1859 | struct fib6_config cfg; |
1da177e4 LT |
1860 | struct in6_rtmsg rtmsg; |
1861 | int err; | |
1862 | ||
1863 | switch(cmd) { | |
1864 | case SIOCADDRT: /* Add a route */ | |
1865 | case SIOCDELRT: /* Delete a route */ | |
1866 | if (!capable(CAP_NET_ADMIN)) | |
1867 | return -EPERM; | |
1868 | err = copy_from_user(&rtmsg, arg, | |
1869 | sizeof(struct in6_rtmsg)); | |
1870 | if (err) | |
1871 | return -EFAULT; | |
86872cb5 | 1872 | |
5578689a | 1873 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1874 | |
1da177e4 LT |
1875 | rtnl_lock(); |
1876 | switch (cmd) { | |
1877 | case SIOCADDRT: | |
86872cb5 | 1878 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1879 | break; |
1880 | case SIOCDELRT: | |
86872cb5 | 1881 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1882 | break; |
1883 | default: | |
1884 | err = -EINVAL; | |
1885 | } | |
1886 | rtnl_unlock(); | |
1887 | ||
1888 | return err; | |
3ff50b79 | 1889 | } |
1da177e4 LT |
1890 | |
1891 | return -EINVAL; | |
1892 | } | |
1893 | ||
1894 | /* | |
1895 | * Drop the packet on the floor | |
1896 | */ | |
1897 | ||
d5fdd6ba | 1898 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 1899 | { |
612f09e8 | 1900 | int type; |
adf30907 | 1901 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
1902 | switch (ipstats_mib_noroutes) { |
1903 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1904 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 1905 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
1906 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1907 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
1908 | break; |
1909 | } | |
1910 | /* FALLTHROUGH */ | |
1911 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
1912 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1913 | ipstats_mib_noroutes); | |
612f09e8 YH |
1914 | break; |
1915 | } | |
3ffe533c | 1916 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
1917 | kfree_skb(skb); |
1918 | return 0; | |
1919 | } | |
1920 | ||
9ce8ade0 TG |
1921 | static int ip6_pkt_discard(struct sk_buff *skb) |
1922 | { | |
612f09e8 | 1923 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1924 | } |
1925 | ||
20380731 | 1926 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 1927 | { |
adf30907 | 1928 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 1929 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1930 | } |
1931 | ||
6723ab54 DM |
1932 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1933 | ||
9ce8ade0 TG |
1934 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1935 | { | |
612f09e8 | 1936 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1937 | } |
1938 | ||
1939 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1940 | { | |
adf30907 | 1941 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 1942 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1943 | } |
1944 | ||
6723ab54 DM |
1945 | #endif |
1946 | ||
1da177e4 LT |
1947 | /* |
1948 | * Allocate a dst for local (unicast / anycast) address. | |
1949 | */ | |
1950 | ||
1951 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1952 | const struct in6_addr *addr, | |
1953 | int anycast) | |
1954 | { | |
c346dca1 | 1955 | struct net *net = dev_net(idev->dev); |
86393e52 | 1956 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
14deae41 | 1957 | struct neighbour *neigh; |
1da177e4 | 1958 | |
40385653 BG |
1959 | if (rt == NULL) { |
1960 | if (net_ratelimit()) | |
1961 | pr_warning("IPv6: Maximum number of routes reached," | |
1962 | " consider increasing route/max_size.\n"); | |
1da177e4 | 1963 | return ERR_PTR(-ENOMEM); |
40385653 | 1964 | } |
1da177e4 | 1965 | |
5578689a | 1966 | dev_hold(net->loopback_dev); |
1da177e4 LT |
1967 | in6_dev_hold(idev); |
1968 | ||
d8d1f30b CG |
1969 | rt->dst.flags = DST_HOST; |
1970 | rt->dst.input = ip6_input; | |
1971 | rt->dst.output = ip6_output; | |
5578689a | 1972 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 | 1973 | rt->rt6i_idev = idev; |
defb3519 | 1974 | dst_metric_set(&rt->dst, RTAX_MTU, ipv6_get_mtu(rt->rt6i_dev)); |
defb3519 | 1975 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, -1); |
d8d1f30b | 1976 | rt->dst.obsolete = -1; |
1da177e4 LT |
1977 | |
1978 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1979 | if (anycast) |
1980 | rt->rt6i_flags |= RTF_ANYCAST; | |
1981 | else | |
1da177e4 | 1982 | rt->rt6i_flags |= RTF_LOCAL; |
14deae41 DM |
1983 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); |
1984 | if (IS_ERR(neigh)) { | |
d8d1f30b | 1985 | dst_free(&rt->dst); |
14deae41 DM |
1986 | |
1987 | /* We are casting this because that is the return | |
1988 | * value type. But an errno encoded pointer is the | |
1989 | * same regardless of the underlying pointer type, | |
1990 | * and that's what we are returning. So this is OK. | |
1991 | */ | |
1992 | return (struct rt6_info *) neigh; | |
1da177e4 | 1993 | } |
14deae41 | 1994 | rt->rt6i_nexthop = neigh; |
1da177e4 LT |
1995 | |
1996 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1997 | rt->rt6i_dst.plen = 128; | |
5578689a | 1998 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 1999 | |
d8d1f30b | 2000 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2001 | |
2002 | return rt; | |
2003 | } | |
2004 | ||
8ed67789 DL |
2005 | struct arg_dev_net { |
2006 | struct net_device *dev; | |
2007 | struct net *net; | |
2008 | }; | |
2009 | ||
1da177e4 LT |
2010 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2011 | { | |
8ed67789 DL |
2012 | struct net_device *dev = ((struct arg_dev_net *)arg)->dev; |
2013 | struct net *net = ((struct arg_dev_net *)arg)->net; | |
2014 | ||
2015 | if (((void *)rt->rt6i_dev == dev || dev == NULL) && | |
2016 | rt != net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
2017 | RT6_TRACE("deleted by ifdown %p\n", rt); |
2018 | return -1; | |
2019 | } | |
2020 | return 0; | |
2021 | } | |
2022 | ||
f3db4851 | 2023 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2024 | { |
8ed67789 DL |
2025 | struct arg_dev_net adn = { |
2026 | .dev = dev, | |
2027 | .net = net, | |
2028 | }; | |
2029 | ||
2030 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2031 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2032 | } |
2033 | ||
2034 | struct rt6_mtu_change_arg | |
2035 | { | |
2036 | struct net_device *dev; | |
2037 | unsigned mtu; | |
2038 | }; | |
2039 | ||
2040 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2041 | { | |
2042 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2043 | struct inet6_dev *idev; | |
2044 | ||
2045 | /* In IPv6 pmtu discovery is not optional, | |
2046 | so that RTAX_MTU lock cannot disable it. | |
2047 | We still use this lock to block changes | |
2048 | caused by addrconf/ndisc. | |
2049 | */ | |
2050 | ||
2051 | idev = __in6_dev_get(arg->dev); | |
2052 | if (idev == NULL) | |
2053 | return 0; | |
2054 | ||
2055 | /* For administrative MTU increase, there is no way to discover | |
2056 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2057 | Since RFC 1981 doesn't include administrative MTU increase | |
2058 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2059 | */ | |
2060 | /* | |
2061 | If new MTU is less than route PMTU, this new MTU will be the | |
2062 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2063 | decreases; if new MTU is greater than route PMTU, and the | |
2064 | old MTU is the lowest MTU in the path, update the route PMTU | |
2065 | to reflect the increase. In this case if the other nodes' MTU | |
2066 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2067 | PMTU discouvery. | |
2068 | */ | |
2069 | if (rt->rt6i_dev == arg->dev && | |
d8d1f30b CG |
2070 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2071 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2072 | (dst_mtu(&rt->dst) < arg->mtu && | |
2073 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2074 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2075 | } |
1da177e4 LT |
2076 | return 0; |
2077 | } | |
2078 | ||
2079 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
2080 | { | |
c71099ac TG |
2081 | struct rt6_mtu_change_arg arg = { |
2082 | .dev = dev, | |
2083 | .mtu = mtu, | |
2084 | }; | |
1da177e4 | 2085 | |
c346dca1 | 2086 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2087 | } |
2088 | ||
ef7c79ed | 2089 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2090 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2091 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2092 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2093 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2094 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2095 | }; | |
2096 | ||
2097 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2098 | struct fib6_config *cfg) | |
1da177e4 | 2099 | { |
86872cb5 TG |
2100 | struct rtmsg *rtm; |
2101 | struct nlattr *tb[RTA_MAX+1]; | |
2102 | int err; | |
1da177e4 | 2103 | |
86872cb5 TG |
2104 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2105 | if (err < 0) | |
2106 | goto errout; | |
1da177e4 | 2107 | |
86872cb5 TG |
2108 | err = -EINVAL; |
2109 | rtm = nlmsg_data(nlh); | |
2110 | memset(cfg, 0, sizeof(*cfg)); | |
2111 | ||
2112 | cfg->fc_table = rtm->rtm_table; | |
2113 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2114 | cfg->fc_src_len = rtm->rtm_src_len; | |
2115 | cfg->fc_flags = RTF_UP; | |
2116 | cfg->fc_protocol = rtm->rtm_protocol; | |
2117 | ||
2118 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2119 | cfg->fc_flags |= RTF_REJECT; | |
2120 | ||
ab79ad14 MŻ |
2121 | if (rtm->rtm_type == RTN_LOCAL) |
2122 | cfg->fc_flags |= RTF_LOCAL; | |
2123 | ||
86872cb5 TG |
2124 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
2125 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2126 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2127 | |
2128 | if (tb[RTA_GATEWAY]) { | |
2129 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2130 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2131 | } |
86872cb5 TG |
2132 | |
2133 | if (tb[RTA_DST]) { | |
2134 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2135 | ||
2136 | if (nla_len(tb[RTA_DST]) < plen) | |
2137 | goto errout; | |
2138 | ||
2139 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2140 | } |
86872cb5 TG |
2141 | |
2142 | if (tb[RTA_SRC]) { | |
2143 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2144 | ||
2145 | if (nla_len(tb[RTA_SRC]) < plen) | |
2146 | goto errout; | |
2147 | ||
2148 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2149 | } |
86872cb5 TG |
2150 | |
2151 | if (tb[RTA_OIF]) | |
2152 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2153 | ||
2154 | if (tb[RTA_PRIORITY]) | |
2155 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2156 | ||
2157 | if (tb[RTA_METRICS]) { | |
2158 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2159 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2160 | } |
86872cb5 TG |
2161 | |
2162 | if (tb[RTA_TABLE]) | |
2163 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2164 | ||
2165 | err = 0; | |
2166 | errout: | |
2167 | return err; | |
1da177e4 LT |
2168 | } |
2169 | ||
c127ea2c | 2170 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2171 | { |
86872cb5 TG |
2172 | struct fib6_config cfg; |
2173 | int err; | |
1da177e4 | 2174 | |
86872cb5 TG |
2175 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2176 | if (err < 0) | |
2177 | return err; | |
2178 | ||
2179 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2180 | } |
2181 | ||
c127ea2c | 2182 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2183 | { |
86872cb5 TG |
2184 | struct fib6_config cfg; |
2185 | int err; | |
1da177e4 | 2186 | |
86872cb5 TG |
2187 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2188 | if (err < 0) | |
2189 | return err; | |
2190 | ||
2191 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2192 | } |
2193 | ||
339bf98f TG |
2194 | static inline size_t rt6_nlmsg_size(void) |
2195 | { | |
2196 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2197 | + nla_total_size(16) /* RTA_SRC */ | |
2198 | + nla_total_size(16) /* RTA_DST */ | |
2199 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2200 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2201 | + nla_total_size(4) /* RTA_TABLE */ | |
2202 | + nla_total_size(4) /* RTA_IIF */ | |
2203 | + nla_total_size(4) /* RTA_OIF */ | |
2204 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2205 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2206 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2207 | } | |
2208 | ||
191cd582 BH |
2209 | static int rt6_fill_node(struct net *net, |
2210 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2211 | struct in6_addr *dst, struct in6_addr *src, |
2212 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2213 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2214 | { |
2215 | struct rtmsg *rtm; | |
2d7202bf | 2216 | struct nlmsghdr *nlh; |
e3703b3d | 2217 | long expires; |
9e762a4a | 2218 | u32 table; |
1da177e4 LT |
2219 | |
2220 | if (prefix) { /* user wants prefix routes only */ | |
2221 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2222 | /* success since this is not a prefix route */ | |
2223 | return 1; | |
2224 | } | |
2225 | } | |
2226 | ||
2d7202bf TG |
2227 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2228 | if (nlh == NULL) | |
26932566 | 2229 | return -EMSGSIZE; |
2d7202bf TG |
2230 | |
2231 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2232 | rtm->rtm_family = AF_INET6; |
2233 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2234 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2235 | rtm->rtm_tos = 0; | |
c71099ac | 2236 | if (rt->rt6i_table) |
9e762a4a | 2237 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2238 | else |
9e762a4a PM |
2239 | table = RT6_TABLE_UNSPEC; |
2240 | rtm->rtm_table = table; | |
2d7202bf | 2241 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2242 | if (rt->rt6i_flags&RTF_REJECT) |
2243 | rtm->rtm_type = RTN_UNREACHABLE; | |
ab79ad14 MŻ |
2244 | else if (rt->rt6i_flags&RTF_LOCAL) |
2245 | rtm->rtm_type = RTN_LOCAL; | |
1da177e4 LT |
2246 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) |
2247 | rtm->rtm_type = RTN_LOCAL; | |
2248 | else | |
2249 | rtm->rtm_type = RTN_UNICAST; | |
2250 | rtm->rtm_flags = 0; | |
2251 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2252 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2253 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2254 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2255 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2256 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2257 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2258 | rtm->rtm_protocol = RTPROT_RA; | |
2259 | ||
2260 | if (rt->rt6i_flags&RTF_CACHE) | |
2261 | rtm->rtm_flags |= RTM_F_CLONED; | |
2262 | ||
2263 | if (dst) { | |
2d7202bf | 2264 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2265 | rtm->rtm_dst_len = 128; |
1da177e4 | 2266 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2267 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2268 | #ifdef CONFIG_IPV6_SUBTREES |
2269 | if (src) { | |
2d7202bf | 2270 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2271 | rtm->rtm_src_len = 128; |
1da177e4 | 2272 | } else if (rtm->rtm_src_len) |
2d7202bf | 2273 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2274 | #endif |
7bc570c8 YH |
2275 | if (iif) { |
2276 | #ifdef CONFIG_IPV6_MROUTE | |
2277 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2278 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2279 | if (err <= 0) { |
2280 | if (!nowait) { | |
2281 | if (err == 0) | |
2282 | return 0; | |
2283 | goto nla_put_failure; | |
2284 | } else { | |
2285 | if (err == -EMSGSIZE) | |
2286 | goto nla_put_failure; | |
2287 | } | |
2288 | } | |
2289 | } else | |
2290 | #endif | |
2291 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2292 | } else if (dst) { | |
d8d1f30b | 2293 | struct inet6_dev *idev = ip6_dst_idev(&rt->dst); |
1da177e4 | 2294 | struct in6_addr saddr_buf; |
191cd582 | 2295 | if (ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, |
7cbca67c | 2296 | dst, 0, &saddr_buf) == 0) |
2d7202bf | 2297 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2298 | } |
2d7202bf | 2299 | |
defb3519 | 2300 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2301 | goto nla_put_failure; |
2302 | ||
d8d1f30b CG |
2303 | if (rt->dst.neighbour) |
2304 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->dst.neighbour->primary_key); | |
2d7202bf | 2305 | |
d8d1f30b | 2306 | if (rt->dst.dev) |
2d7202bf TG |
2307 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2308 | ||
2309 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2310 | |
36e3deae YH |
2311 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2312 | expires = 0; | |
2313 | else if (rt->rt6i_expires - jiffies < INT_MAX) | |
2314 | expires = rt->rt6i_expires - jiffies; | |
2315 | else | |
2316 | expires = INT_MAX; | |
69cdf8f9 | 2317 | |
d8d1f30b CG |
2318 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, |
2319 | expires, rt->dst.error) < 0) | |
e3703b3d | 2320 | goto nla_put_failure; |
2d7202bf TG |
2321 | |
2322 | return nlmsg_end(skb, nlh); | |
2323 | ||
2324 | nla_put_failure: | |
26932566 PM |
2325 | nlmsg_cancel(skb, nlh); |
2326 | return -EMSGSIZE; | |
1da177e4 LT |
2327 | } |
2328 | ||
1b43af54 | 2329 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2330 | { |
2331 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2332 | int prefix; | |
2333 | ||
2d7202bf TG |
2334 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2335 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2336 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2337 | } else | |
2338 | prefix = 0; | |
2339 | ||
191cd582 BH |
2340 | return rt6_fill_node(arg->net, |
2341 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2342 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2343 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2344 | } |
2345 | ||
c127ea2c | 2346 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2347 | { |
3b1e0a65 | 2348 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2349 | struct nlattr *tb[RTA_MAX+1]; |
2350 | struct rt6_info *rt; | |
1da177e4 | 2351 | struct sk_buff *skb; |
ab364a6f | 2352 | struct rtmsg *rtm; |
1da177e4 | 2353 | struct flowi fl; |
ab364a6f | 2354 | int err, iif = 0; |
1da177e4 | 2355 | |
ab364a6f TG |
2356 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2357 | if (err < 0) | |
2358 | goto errout; | |
1da177e4 | 2359 | |
ab364a6f | 2360 | err = -EINVAL; |
1da177e4 | 2361 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2362 | |
ab364a6f TG |
2363 | if (tb[RTA_SRC]) { |
2364 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2365 | goto errout; | |
2366 | ||
2367 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2368 | } | |
2369 | ||
2370 | if (tb[RTA_DST]) { | |
2371 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2372 | goto errout; | |
2373 | ||
2374 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2375 | } | |
2376 | ||
2377 | if (tb[RTA_IIF]) | |
2378 | iif = nla_get_u32(tb[RTA_IIF]); | |
2379 | ||
2380 | if (tb[RTA_OIF]) | |
2381 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2382 | |
2383 | if (iif) { | |
2384 | struct net_device *dev; | |
5578689a | 2385 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2386 | if (!dev) { |
2387 | err = -ENODEV; | |
ab364a6f | 2388 | goto errout; |
1da177e4 LT |
2389 | } |
2390 | } | |
2391 | ||
ab364a6f TG |
2392 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2393 | if (skb == NULL) { | |
2394 | err = -ENOBUFS; | |
2395 | goto errout; | |
2396 | } | |
1da177e4 | 2397 | |
ab364a6f TG |
2398 | /* Reserve room for dummy headers, this skb can pass |
2399 | through good chunk of routing engine. | |
2400 | */ | |
459a98ed | 2401 | skb_reset_mac_header(skb); |
ab364a6f | 2402 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2403 | |
8a3edd80 | 2404 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl); |
d8d1f30b | 2405 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2406 | |
191cd582 | 2407 | err = rt6_fill_node(net, skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2408 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2409 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2410 | if (err < 0) { |
ab364a6f TG |
2411 | kfree_skb(skb); |
2412 | goto errout; | |
1da177e4 LT |
2413 | } |
2414 | ||
5578689a | 2415 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2416 | errout: |
1da177e4 | 2417 | return err; |
1da177e4 LT |
2418 | } |
2419 | ||
86872cb5 | 2420 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2421 | { |
2422 | struct sk_buff *skb; | |
5578689a | 2423 | struct net *net = info->nl_net; |
528c4ceb DL |
2424 | u32 seq; |
2425 | int err; | |
2426 | ||
2427 | err = -ENOBUFS; | |
2428 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2429 | |
339bf98f | 2430 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2431 | if (skb == NULL) |
2432 | goto errout; | |
2433 | ||
191cd582 | 2434 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2435 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2436 | if (err < 0) { |
2437 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2438 | WARN_ON(err == -EMSGSIZE); | |
2439 | kfree_skb(skb); | |
2440 | goto errout; | |
2441 | } | |
1ce85fe4 PNA |
2442 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2443 | info->nlh, gfp_any()); | |
2444 | return; | |
21713ebc TG |
2445 | errout: |
2446 | if (err < 0) | |
5578689a | 2447 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2448 | } |
2449 | ||
8ed67789 DL |
2450 | static int ip6_route_dev_notify(struct notifier_block *this, |
2451 | unsigned long event, void *data) | |
2452 | { | |
2453 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2454 | struct net *net = dev_net(dev); |
8ed67789 DL |
2455 | |
2456 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2457 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2458 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2459 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2460 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2461 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2462 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2463 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2464 | #endif | |
2465 | } | |
2466 | ||
2467 | return NOTIFY_OK; | |
2468 | } | |
2469 | ||
1da177e4 LT |
2470 | /* |
2471 | * /proc | |
2472 | */ | |
2473 | ||
2474 | #ifdef CONFIG_PROC_FS | |
2475 | ||
1da177e4 LT |
2476 | struct rt6_proc_arg |
2477 | { | |
2478 | char *buffer; | |
2479 | int offset; | |
2480 | int length; | |
2481 | int skip; | |
2482 | int len; | |
2483 | }; | |
2484 | ||
2485 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2486 | { | |
33120b30 | 2487 | struct seq_file *m = p_arg; |
1da177e4 | 2488 | |
4b7a4274 | 2489 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2490 | |
2491 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2492 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2493 | #else |
33120b30 | 2494 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2495 | #endif |
2496 | ||
2497 | if (rt->rt6i_nexthop) { | |
4b7a4274 | 2498 | seq_printf(m, "%pi6", rt->rt6i_nexthop->primary_key); |
1da177e4 | 2499 | } else { |
33120b30 | 2500 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2501 | } |
33120b30 | 2502 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2503 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2504 | rt->dst.__use, rt->rt6i_flags, | |
33120b30 | 2505 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); |
1da177e4 LT |
2506 | return 0; |
2507 | } | |
2508 | ||
33120b30 | 2509 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2510 | { |
f3db4851 DL |
2511 | struct net *net = (struct net *)m->private; |
2512 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2513 | return 0; |
2514 | } | |
1da177e4 | 2515 | |
33120b30 AD |
2516 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2517 | { | |
de05c557 | 2518 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2519 | } |
2520 | ||
33120b30 AD |
2521 | static const struct file_operations ipv6_route_proc_fops = { |
2522 | .owner = THIS_MODULE, | |
2523 | .open = ipv6_route_open, | |
2524 | .read = seq_read, | |
2525 | .llseek = seq_lseek, | |
b6fcbdb4 | 2526 | .release = single_release_net, |
33120b30 AD |
2527 | }; |
2528 | ||
1da177e4 LT |
2529 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2530 | { | |
69ddb805 | 2531 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2532 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2533 | net->ipv6.rt6_stats->fib_nodes, |
2534 | net->ipv6.rt6_stats->fib_route_nodes, | |
2535 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2536 | net->ipv6.rt6_stats->fib_rt_entries, | |
2537 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2538 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2539 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2540 | |
2541 | return 0; | |
2542 | } | |
2543 | ||
2544 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2545 | { | |
de05c557 | 2546 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2547 | } |
2548 | ||
9a32144e | 2549 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2550 | .owner = THIS_MODULE, |
2551 | .open = rt6_stats_seq_open, | |
2552 | .read = seq_read, | |
2553 | .llseek = seq_lseek, | |
b6fcbdb4 | 2554 | .release = single_release_net, |
1da177e4 LT |
2555 | }; |
2556 | #endif /* CONFIG_PROC_FS */ | |
2557 | ||
2558 | #ifdef CONFIG_SYSCTL | |
2559 | ||
1da177e4 | 2560 | static |
8d65af78 | 2561 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2562 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2563 | { | |
5b7c931d DL |
2564 | struct net *net = current->nsproxy->net_ns; |
2565 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 | 2566 | if (write) { |
8d65af78 | 2567 | proc_dointvec(ctl, write, buffer, lenp, ppos); |
5b7c931d | 2568 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2569 | return 0; |
2570 | } else | |
2571 | return -EINVAL; | |
2572 | } | |
2573 | ||
760f2d01 | 2574 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2575 | { |
1da177e4 | 2576 | .procname = "flush", |
4990509f | 2577 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2578 | .maxlen = sizeof(int), |
89c8b3a1 | 2579 | .mode = 0200, |
6d9f239a | 2580 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2581 | }, |
2582 | { | |
1da177e4 | 2583 | .procname = "gc_thresh", |
9a7ec3a9 | 2584 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2585 | .maxlen = sizeof(int), |
2586 | .mode = 0644, | |
6d9f239a | 2587 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2588 | }, |
2589 | { | |
1da177e4 | 2590 | .procname = "max_size", |
4990509f | 2591 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2592 | .maxlen = sizeof(int), |
2593 | .mode = 0644, | |
6d9f239a | 2594 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2595 | }, |
2596 | { | |
1da177e4 | 2597 | .procname = "gc_min_interval", |
4990509f | 2598 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2599 | .maxlen = sizeof(int), |
2600 | .mode = 0644, | |
6d9f239a | 2601 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2602 | }, |
2603 | { | |
1da177e4 | 2604 | .procname = "gc_timeout", |
4990509f | 2605 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2606 | .maxlen = sizeof(int), |
2607 | .mode = 0644, | |
6d9f239a | 2608 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2609 | }, |
2610 | { | |
1da177e4 | 2611 | .procname = "gc_interval", |
4990509f | 2612 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2613 | .maxlen = sizeof(int), |
2614 | .mode = 0644, | |
6d9f239a | 2615 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2616 | }, |
2617 | { | |
1da177e4 | 2618 | .procname = "gc_elasticity", |
4990509f | 2619 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2620 | .maxlen = sizeof(int), |
2621 | .mode = 0644, | |
f3d3f616 | 2622 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2623 | }, |
2624 | { | |
1da177e4 | 2625 | .procname = "mtu_expires", |
4990509f | 2626 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2627 | .maxlen = sizeof(int), |
2628 | .mode = 0644, | |
6d9f239a | 2629 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2630 | }, |
2631 | { | |
1da177e4 | 2632 | .procname = "min_adv_mss", |
4990509f | 2633 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2634 | .maxlen = sizeof(int), |
2635 | .mode = 0644, | |
f3d3f616 | 2636 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2637 | }, |
2638 | { | |
1da177e4 | 2639 | .procname = "gc_min_interval_ms", |
4990509f | 2640 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2641 | .maxlen = sizeof(int), |
2642 | .mode = 0644, | |
6d9f239a | 2643 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2644 | }, |
f8572d8f | 2645 | { } |
1da177e4 LT |
2646 | }; |
2647 | ||
2c8c1e72 | 2648 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2649 | { |
2650 | struct ctl_table *table; | |
2651 | ||
2652 | table = kmemdup(ipv6_route_table_template, | |
2653 | sizeof(ipv6_route_table_template), | |
2654 | GFP_KERNEL); | |
5ee09105 YH |
2655 | |
2656 | if (table) { | |
2657 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
86393e52 | 2658 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2659 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2660 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2661 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2662 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2663 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2664 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2665 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2666 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2667 | } |
2668 | ||
760f2d01 DL |
2669 | return table; |
2670 | } | |
1da177e4 LT |
2671 | #endif |
2672 | ||
2c8c1e72 | 2673 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2674 | { |
633d424b | 2675 | int ret = -ENOMEM; |
8ed67789 | 2676 | |
86393e52 AD |
2677 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2678 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2679 | |
fc66f95c ED |
2680 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2681 | goto out_ip6_dst_ops; | |
2682 | ||
8ed67789 DL |
2683 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2684 | sizeof(*net->ipv6.ip6_null_entry), | |
2685 | GFP_KERNEL); | |
2686 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2687 | goto out_ip6_dst_entries; |
d8d1f30b | 2688 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2689 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2690 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
defb3519 | 2691 | dst_metric_set(&net->ipv6.ip6_null_entry->dst, RTAX_HOPLIMIT, 255); |
8ed67789 DL |
2692 | |
2693 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2694 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2695 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2696 | GFP_KERNEL); | |
68fffc67 PZ |
2697 | if (!net->ipv6.ip6_prohibit_entry) |
2698 | goto out_ip6_null_entry; | |
d8d1f30b | 2699 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2700 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2701 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
defb3519 | 2702 | dst_metric_set(&net->ipv6.ip6_prohibit_entry->dst, RTAX_HOPLIMIT, 255); |
8ed67789 DL |
2703 | |
2704 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2705 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2706 | GFP_KERNEL); | |
68fffc67 PZ |
2707 | if (!net->ipv6.ip6_blk_hole_entry) |
2708 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2709 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2710 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2711 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
defb3519 | 2712 | dst_metric_set(&net->ipv6.ip6_blk_hole_entry->dst, RTAX_HOPLIMIT, 255); |
8ed67789 DL |
2713 | #endif |
2714 | ||
b339a47c PZ |
2715 | net->ipv6.sysctl.flush_delay = 0; |
2716 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2717 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2718 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2719 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2720 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2721 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2722 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2723 | ||
cdb18761 DL |
2724 | #ifdef CONFIG_PROC_FS |
2725 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2726 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2727 | #endif | |
6891a346 BT |
2728 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2729 | ||
8ed67789 DL |
2730 | ret = 0; |
2731 | out: | |
2732 | return ret; | |
f2fc6a54 | 2733 | |
68fffc67 PZ |
2734 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2735 | out_ip6_prohibit_entry: | |
2736 | kfree(net->ipv6.ip6_prohibit_entry); | |
2737 | out_ip6_null_entry: | |
2738 | kfree(net->ipv6.ip6_null_entry); | |
2739 | #endif | |
fc66f95c ED |
2740 | out_ip6_dst_entries: |
2741 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2742 | out_ip6_dst_ops: |
f2fc6a54 | 2743 | goto out; |
cdb18761 DL |
2744 | } |
2745 | ||
2c8c1e72 | 2746 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 DL |
2747 | { |
2748 | #ifdef CONFIG_PROC_FS | |
2749 | proc_net_remove(net, "ipv6_route"); | |
2750 | proc_net_remove(net, "rt6_stats"); | |
2751 | #endif | |
8ed67789 DL |
2752 | kfree(net->ipv6.ip6_null_entry); |
2753 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2754 | kfree(net->ipv6.ip6_prohibit_entry); | |
2755 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2756 | #endif | |
41bb78b4 | 2757 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2758 | } |
2759 | ||
2760 | static struct pernet_operations ip6_route_net_ops = { | |
2761 | .init = ip6_route_net_init, | |
2762 | .exit = ip6_route_net_exit, | |
2763 | }; | |
2764 | ||
8ed67789 DL |
2765 | static struct notifier_block ip6_route_dev_notifier = { |
2766 | .notifier_call = ip6_route_dev_notify, | |
2767 | .priority = 0, | |
2768 | }; | |
2769 | ||
433d49c3 | 2770 | int __init ip6_route_init(void) |
1da177e4 | 2771 | { |
433d49c3 DL |
2772 | int ret; |
2773 | ||
9a7ec3a9 DL |
2774 | ret = -ENOMEM; |
2775 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2776 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2777 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2778 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 2779 | goto out; |
14e50e57 | 2780 | |
fc66f95c | 2781 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 2782 | if (ret) |
bdb3289f | 2783 | goto out_kmem_cache; |
bdb3289f | 2784 | |
fc66f95c ED |
2785 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2786 | if (ret) | |
2787 | goto out_dst_entries; | |
2788 | ||
5dc121e9 AE |
2789 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2790 | ||
8ed67789 DL |
2791 | /* Registering of the loopback is done before this portion of code, |
2792 | * the loopback reference in rt6_info will not be taken, do it | |
2793 | * manually for init_net */ | |
d8d1f30b | 2794 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2795 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2796 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2797 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 2798 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 2799 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2800 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2801 | #endif | |
433d49c3 DL |
2802 | ret = fib6_init(); |
2803 | if (ret) | |
8ed67789 | 2804 | goto out_register_subsys; |
433d49c3 | 2805 | |
433d49c3 DL |
2806 | ret = xfrm6_init(); |
2807 | if (ret) | |
cdb18761 | 2808 | goto out_fib6_init; |
c35b7e72 | 2809 | |
433d49c3 DL |
2810 | ret = fib6_rules_init(); |
2811 | if (ret) | |
2812 | goto xfrm6_init; | |
7e5449c2 | 2813 | |
433d49c3 DL |
2814 | ret = -ENOBUFS; |
2815 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2816 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2817 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2818 | goto fib6_rules_init; | |
c127ea2c | 2819 | |
8ed67789 | 2820 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2821 | if (ret) |
2822 | goto fib6_rules_init; | |
8ed67789 | 2823 | |
433d49c3 DL |
2824 | out: |
2825 | return ret; | |
2826 | ||
2827 | fib6_rules_init: | |
433d49c3 DL |
2828 | fib6_rules_cleanup(); |
2829 | xfrm6_init: | |
433d49c3 | 2830 | xfrm6_fini(); |
433d49c3 | 2831 | out_fib6_init: |
433d49c3 | 2832 | fib6_gc_cleanup(); |
8ed67789 DL |
2833 | out_register_subsys: |
2834 | unregister_pernet_subsys(&ip6_route_net_ops); | |
fc66f95c ED |
2835 | out_dst_entries: |
2836 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 2837 | out_kmem_cache: |
f2fc6a54 | 2838 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2839 | goto out; |
1da177e4 LT |
2840 | } |
2841 | ||
2842 | void ip6_route_cleanup(void) | |
2843 | { | |
8ed67789 | 2844 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2845 | fib6_rules_cleanup(); |
1da177e4 | 2846 | xfrm6_fini(); |
1da177e4 | 2847 | fib6_gc_cleanup(); |
8ed67789 | 2848 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 2849 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 2850 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2851 | } |