Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
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 | ||
1da177e4 LT |
75 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
76 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 77 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
d33e4553 | 78 | static unsigned int ip6_default_mtu(const struct dst_entry *dst); |
1da177e4 LT |
79 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
80 | static void ip6_dst_destroy(struct dst_entry *); | |
81 | static void ip6_dst_ifdown(struct dst_entry *, | |
82 | struct net_device *dev, int how); | |
569d3645 | 83 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
84 | |
85 | static int ip6_pkt_discard(struct sk_buff *skb); | |
86 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
87 | static void ip6_link_failure(struct sk_buff *skb); | |
88 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
89 | ||
70ceb4f5 | 90 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
91 | static struct rt6_info *rt6_add_route_info(struct net *net, |
92 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
93 | struct in6_addr *gwaddr, int ifindex, |
94 | unsigned pref); | |
efa2cea0 DL |
95 | static struct rt6_info *rt6_get_route_info(struct net *net, |
96 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
97 | struct in6_addr *gwaddr, int ifindex); |
98 | #endif | |
99 | ||
9a7ec3a9 | 100 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 101 | .family = AF_INET6, |
09640e63 | 102 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
103 | .gc = ip6_dst_gc, |
104 | .gc_thresh = 1024, | |
105 | .check = ip6_dst_check, | |
0dbaee3b | 106 | .default_advmss = ip6_default_advmss, |
d33e4553 | 107 | .default_mtu = ip6_default_mtu, |
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 | ||
ec831ea7 RD |
116 | static unsigned int ip6_blackhole_default_mtu(const struct dst_entry *dst) |
117 | { | |
118 | return 0; | |
119 | } | |
120 | ||
14e50e57 DM |
121 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
122 | { | |
123 | } | |
124 | ||
125 | static struct dst_ops ip6_dst_blackhole_ops = { | |
126 | .family = AF_INET6, | |
09640e63 | 127 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
128 | .destroy = ip6_dst_destroy, |
129 | .check = ip6_dst_check, | |
ec831ea7 | 130 | .default_mtu = ip6_blackhole_default_mtu, |
214f45c9 | 131 | .default_advmss = ip6_default_advmss, |
14e50e57 | 132 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
14e50e57 DM |
133 | }; |
134 | ||
bdb3289f | 135 | static struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
136 | .dst = { |
137 | .__refcnt = ATOMIC_INIT(1), | |
138 | .__use = 1, | |
139 | .obsolete = -1, | |
140 | .error = -ENETUNREACH, | |
d8d1f30b CG |
141 | .input = ip6_pkt_discard, |
142 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
143 | }, |
144 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 145 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
146 | .rt6i_metric = ~(u32) 0, |
147 | .rt6i_ref = ATOMIC_INIT(1), | |
148 | }; | |
149 | ||
101367c2 TG |
150 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
151 | ||
6723ab54 DM |
152 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
153 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 154 | |
280a34c8 | 155 | static struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
156 | .dst = { |
157 | .__refcnt = ATOMIC_INIT(1), | |
158 | .__use = 1, | |
159 | .obsolete = -1, | |
160 | .error = -EACCES, | |
d8d1f30b CG |
161 | .input = ip6_pkt_prohibit, |
162 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
163 | }, |
164 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 165 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
166 | .rt6i_metric = ~(u32) 0, |
167 | .rt6i_ref = ATOMIC_INIT(1), | |
168 | }; | |
169 | ||
bdb3289f | 170 | static struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
171 | .dst = { |
172 | .__refcnt = ATOMIC_INIT(1), | |
173 | .__use = 1, | |
174 | .obsolete = -1, | |
175 | .error = -EINVAL, | |
d8d1f30b CG |
176 | .input = dst_discard, |
177 | .output = dst_discard, | |
101367c2 TG |
178 | }, |
179 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 180 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
181 | .rt6i_metric = ~(u32) 0, |
182 | .rt6i_ref = ATOMIC_INIT(1), | |
183 | }; | |
184 | ||
185 | #endif | |
186 | ||
1da177e4 | 187 | /* allocate dst with ip6_dst_ops */ |
f2fc6a54 | 188 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops) |
1da177e4 | 189 | { |
f2fc6a54 | 190 | return (struct rt6_info *)dst_alloc(ops); |
1da177e4 LT |
191 | } |
192 | ||
193 | static void ip6_dst_destroy(struct dst_entry *dst) | |
194 | { | |
195 | struct rt6_info *rt = (struct rt6_info *)dst; | |
196 | struct inet6_dev *idev = rt->rt6i_idev; | |
b3419363 | 197 | struct inet_peer *peer = rt->rt6i_peer; |
1da177e4 LT |
198 | |
199 | if (idev != NULL) { | |
200 | rt->rt6i_idev = NULL; | |
201 | in6_dev_put(idev); | |
1ab1457c | 202 | } |
b3419363 | 203 | if (peer) { |
b3419363 DM |
204 | rt->rt6i_peer = NULL; |
205 | inet_putpeer(peer); | |
206 | } | |
207 | } | |
208 | ||
209 | void rt6_bind_peer(struct rt6_info *rt, int create) | |
210 | { | |
211 | struct inet_peer *peer; | |
212 | ||
b3419363 DM |
213 | peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create); |
214 | if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL) | |
215 | inet_putpeer(peer); | |
1da177e4 LT |
216 | } |
217 | ||
218 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
219 | int how) | |
220 | { | |
221 | struct rt6_info *rt = (struct rt6_info *)dst; | |
222 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 223 | struct net_device *loopback_dev = |
c346dca1 | 224 | dev_net(dev)->loopback_dev; |
1da177e4 | 225 | |
5a3e55d6 DL |
226 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
227 | struct inet6_dev *loopback_idev = | |
228 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
229 | if (loopback_idev != NULL) { |
230 | rt->rt6i_idev = loopback_idev; | |
231 | in6_dev_put(idev); | |
232 | } | |
233 | } | |
234 | } | |
235 | ||
236 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
237 | { | |
a02cec21 ED |
238 | return (rt->rt6i_flags & RTF_EXPIRES) && |
239 | time_after(jiffies, rt->rt6i_expires); | |
1da177e4 LT |
240 | } |
241 | ||
c71099ac TG |
242 | static inline int rt6_need_strict(struct in6_addr *daddr) |
243 | { | |
a02cec21 ED |
244 | return ipv6_addr_type(daddr) & |
245 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
246 | } |
247 | ||
1da177e4 | 248 | /* |
c71099ac | 249 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
250 | */ |
251 | ||
8ed67789 DL |
252 | static inline struct rt6_info *rt6_device_match(struct net *net, |
253 | struct rt6_info *rt, | |
dd3abc4e | 254 | struct in6_addr *saddr, |
1da177e4 | 255 | int oif, |
d420895e | 256 | int flags) |
1da177e4 LT |
257 | { |
258 | struct rt6_info *local = NULL; | |
259 | struct rt6_info *sprt; | |
260 | ||
dd3abc4e YH |
261 | if (!oif && ipv6_addr_any(saddr)) |
262 | goto out; | |
263 | ||
d8d1f30b | 264 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
dd3abc4e YH |
265 | struct net_device *dev = sprt->rt6i_dev; |
266 | ||
267 | if (oif) { | |
1da177e4 LT |
268 | if (dev->ifindex == oif) |
269 | return sprt; | |
270 | if (dev->flags & IFF_LOOPBACK) { | |
271 | if (sprt->rt6i_idev == NULL || | |
272 | sprt->rt6i_idev->dev->ifindex != oif) { | |
d420895e | 273 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 274 | continue; |
1ab1457c | 275 | if (local && (!oif || |
1da177e4 LT |
276 | local->rt6i_idev->dev->ifindex == oif)) |
277 | continue; | |
278 | } | |
279 | local = sprt; | |
280 | } | |
dd3abc4e YH |
281 | } else { |
282 | if (ipv6_chk_addr(net, saddr, dev, | |
283 | flags & RT6_LOOKUP_F_IFACE)) | |
284 | return sprt; | |
1da177e4 | 285 | } |
dd3abc4e | 286 | } |
1da177e4 | 287 | |
dd3abc4e | 288 | if (oif) { |
1da177e4 LT |
289 | if (local) |
290 | return local; | |
291 | ||
d420895e | 292 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 293 | return net->ipv6.ip6_null_entry; |
1da177e4 | 294 | } |
dd3abc4e | 295 | out: |
1da177e4 LT |
296 | return rt; |
297 | } | |
298 | ||
27097255 YH |
299 | #ifdef CONFIG_IPV6_ROUTER_PREF |
300 | static void rt6_probe(struct rt6_info *rt) | |
301 | { | |
302 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
303 | /* | |
304 | * Okay, this does not seem to be appropriate | |
305 | * for now, however, we need to check if it | |
306 | * is really so; aka Router Reachability Probing. | |
307 | * | |
308 | * Router Reachability Probe MUST be rate-limited | |
309 | * to no more than one per minute. | |
310 | */ | |
311 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
312 | return; | |
313 | read_lock_bh(&neigh->lock); | |
314 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 315 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
316 | struct in6_addr mcaddr; |
317 | struct in6_addr *target; | |
318 | ||
319 | neigh->updated = jiffies; | |
320 | read_unlock_bh(&neigh->lock); | |
321 | ||
322 | target = (struct in6_addr *)&neigh->primary_key; | |
323 | addrconf_addr_solict_mult(target, &mcaddr); | |
324 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
325 | } else | |
326 | read_unlock_bh(&neigh->lock); | |
327 | } | |
328 | #else | |
329 | static inline void rt6_probe(struct rt6_info *rt) | |
330 | { | |
27097255 YH |
331 | } |
332 | #endif | |
333 | ||
1da177e4 | 334 | /* |
554cfb7e | 335 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 336 | */ |
b6f99a21 | 337 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
338 | { |
339 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 340 | if (!oif || dev->ifindex == oif) |
554cfb7e | 341 | return 2; |
161980f4 DM |
342 | if ((dev->flags & IFF_LOOPBACK) && |
343 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
344 | return 1; | |
345 | return 0; | |
554cfb7e | 346 | } |
1da177e4 | 347 | |
b6f99a21 | 348 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 349 | { |
554cfb7e | 350 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 351 | int m; |
4d0c5911 YH |
352 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
353 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
354 | m = 1; | |
355 | else if (neigh) { | |
554cfb7e YH |
356 | read_lock_bh(&neigh->lock); |
357 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 358 | m = 2; |
398bcbeb YH |
359 | #ifdef CONFIG_IPV6_ROUTER_PREF |
360 | else if (neigh->nud_state & NUD_FAILED) | |
361 | m = 0; | |
362 | #endif | |
363 | else | |
ea73ee23 | 364 | m = 1; |
554cfb7e | 365 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
366 | } else |
367 | m = 0; | |
554cfb7e | 368 | return m; |
1da177e4 LT |
369 | } |
370 | ||
554cfb7e YH |
371 | static int rt6_score_route(struct rt6_info *rt, int oif, |
372 | int strict) | |
1da177e4 | 373 | { |
4d0c5911 | 374 | int m, n; |
1ab1457c | 375 | |
4d0c5911 | 376 | m = rt6_check_dev(rt, oif); |
77d16f45 | 377 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 378 | return -1; |
ebacaaa0 YH |
379 | #ifdef CONFIG_IPV6_ROUTER_PREF |
380 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
381 | #endif | |
4d0c5911 | 382 | n = rt6_check_neigh(rt); |
557e92ef | 383 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
384 | return -1; |
385 | return m; | |
386 | } | |
387 | ||
f11e6659 DM |
388 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
389 | int *mpri, struct rt6_info *match) | |
554cfb7e | 390 | { |
f11e6659 DM |
391 | int m; |
392 | ||
393 | if (rt6_check_expired(rt)) | |
394 | goto out; | |
395 | ||
396 | m = rt6_score_route(rt, oif, strict); | |
397 | if (m < 0) | |
398 | goto out; | |
399 | ||
400 | if (m > *mpri) { | |
401 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
402 | rt6_probe(match); | |
403 | *mpri = m; | |
404 | match = rt; | |
405 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
406 | rt6_probe(rt); | |
407 | } | |
408 | ||
409 | out: | |
410 | return match; | |
411 | } | |
412 | ||
413 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
414 | struct rt6_info *rr_head, | |
415 | u32 metric, int oif, int strict) | |
416 | { | |
417 | struct rt6_info *rt, *match; | |
554cfb7e | 418 | int mpri = -1; |
1da177e4 | 419 | |
f11e6659 DM |
420 | match = NULL; |
421 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 422 | rt = rt->dst.rt6_next) |
f11e6659 DM |
423 | match = find_match(rt, oif, strict, &mpri, match); |
424 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 425 | rt = rt->dst.rt6_next) |
f11e6659 | 426 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 427 | |
f11e6659 DM |
428 | return match; |
429 | } | |
1da177e4 | 430 | |
f11e6659 DM |
431 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
432 | { | |
433 | struct rt6_info *match, *rt0; | |
8ed67789 | 434 | struct net *net; |
1da177e4 | 435 | |
f11e6659 | 436 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 437 | __func__, fn->leaf, oif); |
554cfb7e | 438 | |
f11e6659 DM |
439 | rt0 = fn->rr_ptr; |
440 | if (!rt0) | |
441 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 442 | |
f11e6659 | 443 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 444 | |
554cfb7e | 445 | if (!match && |
f11e6659 | 446 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 447 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 448 | |
554cfb7e | 449 | /* no entries matched; do round-robin */ |
f11e6659 DM |
450 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
451 | next = fn->leaf; | |
452 | ||
453 | if (next != rt0) | |
454 | fn->rr_ptr = next; | |
1da177e4 | 455 | } |
1da177e4 | 456 | |
f11e6659 | 457 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 458 | __func__, match); |
1da177e4 | 459 | |
c346dca1 | 460 | net = dev_net(rt0->rt6i_dev); |
a02cec21 | 461 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
462 | } |
463 | ||
70ceb4f5 YH |
464 | #ifdef CONFIG_IPV6_ROUTE_INFO |
465 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
466 | struct in6_addr *gwaddr) | |
467 | { | |
c346dca1 | 468 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
469 | struct route_info *rinfo = (struct route_info *) opt; |
470 | struct in6_addr prefix_buf, *prefix; | |
471 | unsigned int pref; | |
4bed72e4 | 472 | unsigned long lifetime; |
70ceb4f5 YH |
473 | struct rt6_info *rt; |
474 | ||
475 | if (len < sizeof(struct route_info)) { | |
476 | return -EINVAL; | |
477 | } | |
478 | ||
479 | /* Sanity check for prefix_len and length */ | |
480 | if (rinfo->length > 3) { | |
481 | return -EINVAL; | |
482 | } else if (rinfo->prefix_len > 128) { | |
483 | return -EINVAL; | |
484 | } else if (rinfo->prefix_len > 64) { | |
485 | if (rinfo->length < 2) { | |
486 | return -EINVAL; | |
487 | } | |
488 | } else if (rinfo->prefix_len > 0) { | |
489 | if (rinfo->length < 1) { | |
490 | return -EINVAL; | |
491 | } | |
492 | } | |
493 | ||
494 | pref = rinfo->route_pref; | |
495 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 496 | return -EINVAL; |
70ceb4f5 | 497 | |
4bed72e4 | 498 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
499 | |
500 | if (rinfo->length == 3) | |
501 | prefix = (struct in6_addr *)rinfo->prefix; | |
502 | else { | |
503 | /* this function is safe */ | |
504 | ipv6_addr_prefix(&prefix_buf, | |
505 | (struct in6_addr *)rinfo->prefix, | |
506 | rinfo->prefix_len); | |
507 | prefix = &prefix_buf; | |
508 | } | |
509 | ||
efa2cea0 DL |
510 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
511 | dev->ifindex); | |
70ceb4f5 YH |
512 | |
513 | if (rt && !lifetime) { | |
e0a1ad73 | 514 | ip6_del_rt(rt); |
70ceb4f5 YH |
515 | rt = NULL; |
516 | } | |
517 | ||
518 | if (!rt && lifetime) | |
efa2cea0 | 519 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
520 | pref); |
521 | else if (rt) | |
522 | rt->rt6i_flags = RTF_ROUTEINFO | | |
523 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
524 | ||
525 | if (rt) { | |
4bed72e4 | 526 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
527 | rt->rt6i_flags &= ~RTF_EXPIRES; |
528 | } else { | |
529 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
530 | rt->rt6i_flags |= RTF_EXPIRES; | |
531 | } | |
d8d1f30b | 532 | dst_release(&rt->dst); |
70ceb4f5 YH |
533 | } |
534 | return 0; | |
535 | } | |
536 | #endif | |
537 | ||
8ed67789 | 538 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 539 | do { \ |
8ed67789 | 540 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 541 | struct fib6_node *pn; \ |
e0eda7bb | 542 | while (1) { \ |
982f56f3 YH |
543 | if (fn->fn_flags & RTN_TL_ROOT) \ |
544 | goto out; \ | |
545 | pn = fn->parent; \ | |
546 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 547 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
548 | else \ |
549 | fn = pn; \ | |
550 | if (fn->fn_flags & RTN_RTINFO) \ | |
551 | goto restart; \ | |
c71099ac | 552 | } \ |
c71099ac | 553 | } \ |
982f56f3 | 554 | } while(0) |
c71099ac | 555 | |
8ed67789 DL |
556 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
557 | struct fib6_table *table, | |
c71099ac | 558 | struct flowi *fl, int flags) |
1da177e4 LT |
559 | { |
560 | struct fib6_node *fn; | |
561 | struct rt6_info *rt; | |
562 | ||
c71099ac TG |
563 | read_lock_bh(&table->tb6_lock); |
564 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
565 | restart: | |
566 | rt = fn->leaf; | |
dd3abc4e | 567 | rt = rt6_device_match(net, rt, &fl->fl6_src, fl->oif, flags); |
8ed67789 | 568 | BACKTRACK(net, &fl->fl6_src); |
c71099ac | 569 | out: |
d8d1f30b | 570 | dst_use(&rt->dst, jiffies); |
c71099ac | 571 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
572 | return rt; |
573 | ||
574 | } | |
575 | ||
9acd9f3a YH |
576 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
577 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
578 | { |
579 | struct flowi fl = { | |
580 | .oif = oif, | |
5811662b | 581 | .fl6_dst = *daddr, |
c71099ac TG |
582 | }; |
583 | struct dst_entry *dst; | |
77d16f45 | 584 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 585 | |
adaa70bb TG |
586 | if (saddr) { |
587 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
588 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
589 | } | |
590 | ||
606a2b48 | 591 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
592 | if (dst->error == 0) |
593 | return (struct rt6_info *) dst; | |
594 | ||
595 | dst_release(dst); | |
596 | ||
1da177e4 LT |
597 | return NULL; |
598 | } | |
599 | ||
7159039a YH |
600 | EXPORT_SYMBOL(rt6_lookup); |
601 | ||
c71099ac | 602 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
603 | It takes new route entry, the addition fails by any reason the |
604 | route is freed. In any case, if caller does not hold it, it may | |
605 | be destroyed. | |
606 | */ | |
607 | ||
86872cb5 | 608 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
609 | { |
610 | int err; | |
c71099ac | 611 | struct fib6_table *table; |
1da177e4 | 612 | |
c71099ac TG |
613 | table = rt->rt6i_table; |
614 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 615 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 616 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
617 | |
618 | return err; | |
619 | } | |
620 | ||
40e22e8f TG |
621 | int ip6_ins_rt(struct rt6_info *rt) |
622 | { | |
4d1169c1 | 623 | struct nl_info info = { |
c346dca1 | 624 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 625 | }; |
528c4ceb | 626 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
627 | } |
628 | ||
95a9a5ba YH |
629 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
630 | struct in6_addr *saddr) | |
1da177e4 | 631 | { |
1da177e4 LT |
632 | struct rt6_info *rt; |
633 | ||
634 | /* | |
635 | * Clone the route. | |
636 | */ | |
637 | ||
638 | rt = ip6_rt_copy(ort); | |
639 | ||
640 | if (rt) { | |
14deae41 DM |
641 | struct neighbour *neigh; |
642 | int attempts = !in_softirq(); | |
643 | ||
58c4fb86 YH |
644 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
645 | if (rt->rt6i_dst.plen != 128 && | |
646 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
647 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 648 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 649 | } |
1da177e4 | 650 | |
58c4fb86 | 651 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
652 | rt->rt6i_dst.plen = 128; |
653 | rt->rt6i_flags |= RTF_CACHE; | |
d8d1f30b | 654 | rt->dst.flags |= DST_HOST; |
1da177e4 LT |
655 | |
656 | #ifdef CONFIG_IPV6_SUBTREES | |
657 | if (rt->rt6i_src.plen && saddr) { | |
658 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
659 | rt->rt6i_src.plen = 128; | |
660 | } | |
661 | #endif | |
662 | ||
14deae41 DM |
663 | retry: |
664 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
665 | if (IS_ERR(neigh)) { | |
666 | struct net *net = dev_net(rt->rt6i_dev); | |
667 | int saved_rt_min_interval = | |
668 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
669 | int saved_rt_elasticity = | |
670 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
671 | ||
672 | if (attempts-- > 0) { | |
673 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
674 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
675 | ||
86393e52 | 676 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
677 | |
678 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
679 | saved_rt_elasticity; | |
680 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
681 | saved_rt_min_interval; | |
682 | goto retry; | |
683 | } | |
684 | ||
685 | if (net_ratelimit()) | |
686 | printk(KERN_WARNING | |
7e1b33e5 | 687 | "ipv6: Neighbour table overflow.\n"); |
d8d1f30b | 688 | dst_free(&rt->dst); |
14deae41 DM |
689 | return NULL; |
690 | } | |
691 | rt->rt6i_nexthop = neigh; | |
1da177e4 | 692 | |
95a9a5ba | 693 | } |
1da177e4 | 694 | |
95a9a5ba YH |
695 | return rt; |
696 | } | |
1da177e4 | 697 | |
299d9939 YH |
698 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
699 | { | |
700 | struct rt6_info *rt = ip6_rt_copy(ort); | |
701 | if (rt) { | |
702 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
703 | rt->rt6i_dst.plen = 128; | |
704 | rt->rt6i_flags |= RTF_CACHE; | |
d8d1f30b | 705 | rt->dst.flags |= DST_HOST; |
299d9939 YH |
706 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); |
707 | } | |
708 | return rt; | |
709 | } | |
710 | ||
8ed67789 DL |
711 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
712 | struct flowi *fl, int flags) | |
1da177e4 LT |
713 | { |
714 | struct fib6_node *fn; | |
519fbd87 | 715 | struct rt6_info *rt, *nrt; |
c71099ac | 716 | int strict = 0; |
1da177e4 | 717 | int attempts = 3; |
519fbd87 | 718 | int err; |
53b7997f | 719 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 720 | |
77d16f45 | 721 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
722 | |
723 | relookup: | |
c71099ac | 724 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 725 | |
8238dd06 | 726 | restart_2: |
c71099ac | 727 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
728 | |
729 | restart: | |
4acad72d | 730 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 DL |
731 | |
732 | BACKTRACK(net, &fl->fl6_src); | |
733 | if (rt == net->ipv6.ip6_null_entry || | |
8238dd06 | 734 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 735 | goto out; |
1da177e4 | 736 | |
d8d1f30b | 737 | dst_hold(&rt->dst); |
c71099ac | 738 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 739 | |
519fbd87 | 740 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 741 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
d80bc0fd | 742 | else |
c71099ac | 743 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
e40cf353 | 744 | |
d8d1f30b | 745 | dst_release(&rt->dst); |
8ed67789 | 746 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 747 | |
d8d1f30b | 748 | dst_hold(&rt->dst); |
519fbd87 | 749 | if (nrt) { |
40e22e8f | 750 | err = ip6_ins_rt(nrt); |
519fbd87 | 751 | if (!err) |
1da177e4 | 752 | goto out2; |
1da177e4 | 753 | } |
1da177e4 | 754 | |
519fbd87 YH |
755 | if (--attempts <= 0) |
756 | goto out2; | |
757 | ||
758 | /* | |
c71099ac | 759 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
760 | * released someone could insert this route. Relookup. |
761 | */ | |
d8d1f30b | 762 | dst_release(&rt->dst); |
519fbd87 YH |
763 | goto relookup; |
764 | ||
765 | out: | |
8238dd06 YH |
766 | if (reachable) { |
767 | reachable = 0; | |
768 | goto restart_2; | |
769 | } | |
d8d1f30b | 770 | dst_hold(&rt->dst); |
c71099ac | 771 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 772 | out2: |
d8d1f30b CG |
773 | rt->dst.lastuse = jiffies; |
774 | rt->dst.__use++; | |
c71099ac TG |
775 | |
776 | return rt; | |
1da177e4 LT |
777 | } |
778 | ||
8ed67789 | 779 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4acad72d PE |
780 | struct flowi *fl, int flags) |
781 | { | |
8ed67789 | 782 | return ip6_pol_route(net, table, fl->iif, fl, flags); |
4acad72d PE |
783 | } |
784 | ||
c71099ac TG |
785 | void ip6_route_input(struct sk_buff *skb) |
786 | { | |
0660e03f | 787 | struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 788 | struct net *net = dev_net(skb->dev); |
adaa70bb | 789 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
790 | struct flowi fl = { |
791 | .iif = skb->dev->ifindex, | |
5811662b CG |
792 | .fl6_dst = iph->daddr, |
793 | .fl6_src = iph->saddr, | |
794 | .fl6_flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, | |
1ab1457c | 795 | .mark = skb->mark, |
c71099ac TG |
796 | .proto = iph->nexthdr, |
797 | }; | |
adaa70bb | 798 | |
1d6e55f1 | 799 | if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG) |
adaa70bb | 800 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 801 | |
adf30907 | 802 | skb_dst_set(skb, fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input)); |
c71099ac TG |
803 | } |
804 | ||
8ed67789 | 805 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
c71099ac | 806 | struct flowi *fl, int flags) |
1da177e4 | 807 | { |
8ed67789 | 808 | return ip6_pol_route(net, table, fl->oif, fl, flags); |
c71099ac TG |
809 | } |
810 | ||
4591db4f DL |
811 | struct dst_entry * ip6_route_output(struct net *net, struct sock *sk, |
812 | struct flowi *fl) | |
c71099ac TG |
813 | { |
814 | int flags = 0; | |
815 | ||
6057fd78 | 816 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl->fl6_dst)) |
77d16f45 | 817 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 818 | |
adaa70bb TG |
819 | if (!ipv6_addr_any(&fl->fl6_src)) |
820 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
0c9a2ac1 YH |
821 | else if (sk) |
822 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 823 | |
4591db4f | 824 | return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
825 | } |
826 | ||
7159039a | 827 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 828 | |
14e50e57 DM |
829 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
830 | { | |
831 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
832 | struct rt6_info *rt = (struct rt6_info *) | |
833 | dst_alloc(&ip6_dst_blackhole_ops); | |
834 | struct dst_entry *new = NULL; | |
835 | ||
836 | if (rt) { | |
d8d1f30b | 837 | new = &rt->dst; |
14e50e57 DM |
838 | |
839 | atomic_set(&new->__refcnt, 1); | |
840 | new->__use = 1; | |
352e512c HX |
841 | new->input = dst_discard; |
842 | new->output = dst_discard; | |
14e50e57 | 843 | |
defb3519 | 844 | dst_copy_metrics(new, &ort->dst); |
d8d1f30b | 845 | new->dev = ort->dst.dev; |
14e50e57 DM |
846 | if (new->dev) |
847 | dev_hold(new->dev); | |
848 | rt->rt6i_idev = ort->rt6i_idev; | |
849 | if (rt->rt6i_idev) | |
850 | in6_dev_hold(rt->rt6i_idev); | |
851 | rt->rt6i_expires = 0; | |
852 | ||
853 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
854 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
855 | rt->rt6i_metric = 0; | |
856 | ||
857 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
858 | #ifdef CONFIG_IPV6_SUBTREES | |
859 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
860 | #endif | |
861 | ||
862 | dst_free(new); | |
863 | } | |
864 | ||
865 | dst_release(*dstp); | |
866 | *dstp = new; | |
a02cec21 | 867 | return new ? 0 : -ENOMEM; |
14e50e57 DM |
868 | } |
869 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
870 | ||
1da177e4 LT |
871 | /* |
872 | * Destination cache support functions | |
873 | */ | |
874 | ||
875 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
876 | { | |
877 | struct rt6_info *rt; | |
878 | ||
879 | rt = (struct rt6_info *) dst; | |
880 | ||
10414444 | 881 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) |
1da177e4 LT |
882 | return dst; |
883 | ||
884 | return NULL; | |
885 | } | |
886 | ||
887 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
888 | { | |
889 | struct rt6_info *rt = (struct rt6_info *) dst; | |
890 | ||
891 | if (rt) { | |
54c1a859 YH |
892 | if (rt->rt6i_flags & RTF_CACHE) { |
893 | if (rt6_check_expired(rt)) { | |
894 | ip6_del_rt(rt); | |
895 | dst = NULL; | |
896 | } | |
897 | } else { | |
1da177e4 | 898 | dst_release(dst); |
54c1a859 YH |
899 | dst = NULL; |
900 | } | |
1da177e4 | 901 | } |
54c1a859 | 902 | return dst; |
1da177e4 LT |
903 | } |
904 | ||
905 | static void ip6_link_failure(struct sk_buff *skb) | |
906 | { | |
907 | struct rt6_info *rt; | |
908 | ||
3ffe533c | 909 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 910 | |
adf30907 | 911 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 LT |
912 | if (rt) { |
913 | if (rt->rt6i_flags&RTF_CACHE) { | |
d8d1f30b | 914 | dst_set_expires(&rt->dst, 0); |
1da177e4 LT |
915 | rt->rt6i_flags |= RTF_EXPIRES; |
916 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
917 | rt->rt6i_node->fn_sernum = -1; | |
918 | } | |
919 | } | |
920 | ||
921 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
922 | { | |
923 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
924 | ||
925 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
926 | rt6->rt6i_flags |= RTF_MODIFIED; | |
927 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 928 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 929 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
930 | features |= RTAX_FEATURE_ALLFRAG; |
931 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 932 | } |
defb3519 | 933 | dst_metric_set(dst, RTAX_MTU, mtu); |
8d71740c | 934 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
935 | } |
936 | } | |
937 | ||
0dbaee3b | 938 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 939 | { |
0dbaee3b DM |
940 | struct net_device *dev = dst->dev; |
941 | unsigned int mtu = dst_mtu(dst); | |
942 | struct net *net = dev_net(dev); | |
943 | ||
1da177e4 LT |
944 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
945 | ||
5578689a DL |
946 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
947 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
948 | |
949 | /* | |
1ab1457c YH |
950 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
951 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
952 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
953 | * rely only on pmtu discovery" |
954 | */ | |
955 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
956 | mtu = IPV6_MAXPLEN; | |
957 | return mtu; | |
958 | } | |
959 | ||
d33e4553 DM |
960 | static unsigned int ip6_default_mtu(const struct dst_entry *dst) |
961 | { | |
962 | unsigned int mtu = IPV6_MIN_MTU; | |
963 | struct inet6_dev *idev; | |
964 | ||
965 | rcu_read_lock(); | |
966 | idev = __in6_dev_get(dst->dev); | |
967 | if (idev) | |
968 | mtu = idev->cnf.mtu6; | |
969 | rcu_read_unlock(); | |
970 | ||
971 | return mtu; | |
972 | } | |
973 | ||
3b00944c YH |
974 | static struct dst_entry *icmp6_dst_gc_list; |
975 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 976 | |
3b00944c | 977 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 978 | struct neighbour *neigh, |
9acd9f3a | 979 | const struct in6_addr *addr) |
1da177e4 LT |
980 | { |
981 | struct rt6_info *rt; | |
982 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 983 | struct net *net = dev_net(dev); |
1da177e4 LT |
984 | |
985 | if (unlikely(idev == NULL)) | |
986 | return NULL; | |
987 | ||
86393e52 | 988 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
989 | if (unlikely(rt == NULL)) { |
990 | in6_dev_put(idev); | |
991 | goto out; | |
992 | } | |
993 | ||
994 | dev_hold(dev); | |
995 | if (neigh) | |
996 | neigh_hold(neigh); | |
14deae41 | 997 | else { |
1da177e4 | 998 | neigh = ndisc_get_neigh(dev, addr); |
14deae41 DM |
999 | if (IS_ERR(neigh)) |
1000 | neigh = NULL; | |
1001 | } | |
1da177e4 LT |
1002 | |
1003 | rt->rt6i_dev = dev; | |
1004 | rt->rt6i_idev = idev; | |
1005 | rt->rt6i_nexthop = neigh; | |
d8d1f30b | 1006 | atomic_set(&rt->dst.__refcnt, 1); |
defb3519 | 1007 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255); |
d8d1f30b | 1008 | rt->dst.output = ip6_output; |
1da177e4 LT |
1009 | |
1010 | #if 0 /* there's no chance to use these for ndisc */ | |
d8d1f30b | 1011 | rt->dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
1ab1457c | 1012 | ? DST_HOST |
1da177e4 LT |
1013 | : 0; |
1014 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1015 | rt->rt6i_dst.plen = 128; | |
1016 | #endif | |
1017 | ||
3b00944c | 1018 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1019 | rt->dst.next = icmp6_dst_gc_list; |
1020 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1021 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1022 | |
5578689a | 1023 | fib6_force_start_gc(net); |
1da177e4 LT |
1024 | |
1025 | out: | |
d8d1f30b | 1026 | return &rt->dst; |
1da177e4 LT |
1027 | } |
1028 | ||
3d0f24a7 | 1029 | int icmp6_dst_gc(void) |
1da177e4 LT |
1030 | { |
1031 | struct dst_entry *dst, *next, **pprev; | |
3d0f24a7 | 1032 | int more = 0; |
1da177e4 LT |
1033 | |
1034 | next = NULL; | |
5d0bbeeb | 1035 | |
3b00944c YH |
1036 | spin_lock_bh(&icmp6_dst_lock); |
1037 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1038 | |
1da177e4 LT |
1039 | while ((dst = *pprev) != NULL) { |
1040 | if (!atomic_read(&dst->__refcnt)) { | |
1041 | *pprev = dst->next; | |
1042 | dst_free(dst); | |
1da177e4 LT |
1043 | } else { |
1044 | pprev = &dst->next; | |
3d0f24a7 | 1045 | ++more; |
1da177e4 LT |
1046 | } |
1047 | } | |
1048 | ||
3b00944c | 1049 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1050 | |
3d0f24a7 | 1051 | return more; |
1da177e4 LT |
1052 | } |
1053 | ||
1e493d19 DM |
1054 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1055 | void *arg) | |
1056 | { | |
1057 | struct dst_entry *dst, **pprev; | |
1058 | ||
1059 | spin_lock_bh(&icmp6_dst_lock); | |
1060 | pprev = &icmp6_dst_gc_list; | |
1061 | while ((dst = *pprev) != NULL) { | |
1062 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1063 | if (func(rt, arg)) { | |
1064 | *pprev = dst->next; | |
1065 | dst_free(dst); | |
1066 | } else { | |
1067 | pprev = &dst->next; | |
1068 | } | |
1069 | } | |
1070 | spin_unlock_bh(&icmp6_dst_lock); | |
1071 | } | |
1072 | ||
569d3645 | 1073 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1074 | { |
1da177e4 | 1075 | unsigned long now = jiffies; |
86393e52 | 1076 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1077 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1078 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1079 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1080 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1081 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1082 | int entries; |
7019b78e | 1083 | |
fc66f95c | 1084 | entries = dst_entries_get_fast(ops); |
7019b78e | 1085 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1086 | entries <= rt_max_size) |
1da177e4 LT |
1087 | goto out; |
1088 | ||
6891a346 BT |
1089 | net->ipv6.ip6_rt_gc_expire++; |
1090 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1091 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1092 | entries = dst_entries_get_slow(ops); |
1093 | if (entries < ops->gc_thresh) | |
7019b78e | 1094 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1095 | out: |
7019b78e | 1096 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1097 | return entries > rt_max_size; |
1da177e4 LT |
1098 | } |
1099 | ||
1100 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1101 | but results in cleaner routing tables. | |
1102 | ||
1103 | Remove it only when all the things will work! | |
1104 | */ | |
1105 | ||
6b75d090 | 1106 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1107 | { |
5170ae82 | 1108 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1109 | if (hoplimit == 0) { |
6b75d090 | 1110 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1111 | struct inet6_dev *idev; |
1112 | ||
1113 | rcu_read_lock(); | |
1114 | idev = __in6_dev_get(dev); | |
1115 | if (idev) | |
6b75d090 | 1116 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1117 | else |
53b7997f | 1118 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1119 | rcu_read_unlock(); |
1da177e4 LT |
1120 | } |
1121 | return hoplimit; | |
1122 | } | |
abbf46ae | 1123 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1124 | |
1125 | /* | |
1126 | * | |
1127 | */ | |
1128 | ||
86872cb5 | 1129 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1130 | { |
1131 | int err; | |
5578689a | 1132 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1133 | struct rt6_info *rt = NULL; |
1134 | struct net_device *dev = NULL; | |
1135 | struct inet6_dev *idev = NULL; | |
c71099ac | 1136 | struct fib6_table *table; |
1da177e4 LT |
1137 | int addr_type; |
1138 | ||
86872cb5 | 1139 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1140 | return -EINVAL; |
1141 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1142 | if (cfg->fc_src_len) |
1da177e4 LT |
1143 | return -EINVAL; |
1144 | #endif | |
86872cb5 | 1145 | if (cfg->fc_ifindex) { |
1da177e4 | 1146 | err = -ENODEV; |
5578689a | 1147 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1148 | if (!dev) |
1149 | goto out; | |
1150 | idev = in6_dev_get(dev); | |
1151 | if (!idev) | |
1152 | goto out; | |
1153 | } | |
1154 | ||
86872cb5 TG |
1155 | if (cfg->fc_metric == 0) |
1156 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1157 | |
5578689a | 1158 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1159 | if (table == NULL) { |
1160 | err = -ENOBUFS; | |
1161 | goto out; | |
1162 | } | |
1163 | ||
86393e52 | 1164 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1165 | |
1166 | if (rt == NULL) { | |
1167 | err = -ENOMEM; | |
1168 | goto out; | |
1169 | } | |
1170 | ||
d8d1f30b | 1171 | rt->dst.obsolete = -1; |
6f704992 YH |
1172 | rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ? |
1173 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : | |
1174 | 0; | |
1da177e4 | 1175 | |
86872cb5 TG |
1176 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1177 | cfg->fc_protocol = RTPROT_BOOT; | |
1178 | rt->rt6i_protocol = cfg->fc_protocol; | |
1179 | ||
1180 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1181 | |
1182 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1183 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1184 | else if (cfg->fc_flags & RTF_LOCAL) |
1185 | rt->dst.input = ip6_input; | |
1da177e4 | 1186 | else |
d8d1f30b | 1187 | rt->dst.input = ip6_forward; |
1da177e4 | 1188 | |
d8d1f30b | 1189 | rt->dst.output = ip6_output; |
1da177e4 | 1190 | |
86872cb5 TG |
1191 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1192 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1193 | if (rt->rt6i_dst.plen == 128) |
d8d1f30b | 1194 | rt->dst.flags = DST_HOST; |
1da177e4 LT |
1195 | |
1196 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1197 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1198 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1199 | #endif |
1200 | ||
86872cb5 | 1201 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1202 | |
1203 | /* We cannot add true routes via loopback here, | |
1204 | they would result in kernel looping; promote them to reject routes | |
1205 | */ | |
86872cb5 | 1206 | if ((cfg->fc_flags & RTF_REJECT) || |
ab79ad14 MŻ |
1207 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK) |
1208 | && !(cfg->fc_flags&RTF_LOCAL))) { | |
1da177e4 | 1209 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1210 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1211 | if (dev) { |
1212 | dev_put(dev); | |
1213 | in6_dev_put(idev); | |
1214 | } | |
5578689a | 1215 | dev = net->loopback_dev; |
1da177e4 LT |
1216 | dev_hold(dev); |
1217 | idev = in6_dev_get(dev); | |
1218 | if (!idev) { | |
1219 | err = -ENODEV; | |
1220 | goto out; | |
1221 | } | |
1222 | } | |
d8d1f30b CG |
1223 | rt->dst.output = ip6_pkt_discard_out; |
1224 | rt->dst.input = ip6_pkt_discard; | |
1225 | rt->dst.error = -ENETUNREACH; | |
1da177e4 LT |
1226 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
1227 | goto install_route; | |
1228 | } | |
1229 | ||
86872cb5 | 1230 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1231 | struct in6_addr *gw_addr; |
1232 | int gwa_type; | |
1233 | ||
86872cb5 TG |
1234 | gw_addr = &cfg->fc_gateway; |
1235 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1236 | gwa_type = ipv6_addr_type(gw_addr); |
1237 | ||
1238 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1239 | struct rt6_info *grt; | |
1240 | ||
1241 | /* IPv6 strictly inhibits using not link-local | |
1242 | addresses as nexthop address. | |
1243 | Otherwise, router will not able to send redirects. | |
1244 | It is very good, but in some (rare!) circumstances | |
1245 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1246 | some exceptions. --ANK | |
1247 | */ | |
1248 | err = -EINVAL; | |
1249 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1250 | goto out; | |
1251 | ||
5578689a | 1252 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1253 | |
1254 | err = -EHOSTUNREACH; | |
1255 | if (grt == NULL) | |
1256 | goto out; | |
1257 | if (dev) { | |
1258 | if (dev != grt->rt6i_dev) { | |
d8d1f30b | 1259 | dst_release(&grt->dst); |
1da177e4 LT |
1260 | goto out; |
1261 | } | |
1262 | } else { | |
1263 | dev = grt->rt6i_dev; | |
1264 | idev = grt->rt6i_idev; | |
1265 | dev_hold(dev); | |
1266 | in6_dev_hold(grt->rt6i_idev); | |
1267 | } | |
1268 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1269 | err = 0; | |
d8d1f30b | 1270 | dst_release(&grt->dst); |
1da177e4 LT |
1271 | |
1272 | if (err) | |
1273 | goto out; | |
1274 | } | |
1275 | err = -EINVAL; | |
1276 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1277 | goto out; | |
1278 | } | |
1279 | ||
1280 | err = -ENODEV; | |
1281 | if (dev == NULL) | |
1282 | goto out; | |
1283 | ||
86872cb5 | 1284 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1285 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1286 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1287 | err = PTR_ERR(rt->rt6i_nexthop); | |
1288 | rt->rt6i_nexthop = NULL; | |
1289 | goto out; | |
1290 | } | |
1291 | } | |
1292 | ||
86872cb5 | 1293 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1294 | |
1295 | install_route: | |
86872cb5 TG |
1296 | if (cfg->fc_mx) { |
1297 | struct nlattr *nla; | |
1298 | int remaining; | |
1299 | ||
1300 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1301 | int type = nla_type(nla); |
86872cb5 TG |
1302 | |
1303 | if (type) { | |
1304 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1305 | err = -EINVAL; |
1306 | goto out; | |
1307 | } | |
86872cb5 | 1308 | |
defb3519 | 1309 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1310 | } |
1da177e4 LT |
1311 | } |
1312 | } | |
1313 | ||
d8d1f30b | 1314 | rt->dst.dev = dev; |
1da177e4 | 1315 | rt->rt6i_idev = idev; |
c71099ac | 1316 | rt->rt6i_table = table; |
63152fc0 | 1317 | |
c346dca1 | 1318 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1319 | |
86872cb5 | 1320 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1321 | |
1322 | out: | |
1323 | if (dev) | |
1324 | dev_put(dev); | |
1325 | if (idev) | |
1326 | in6_dev_put(idev); | |
1327 | if (rt) | |
d8d1f30b | 1328 | dst_free(&rt->dst); |
1da177e4 LT |
1329 | return err; |
1330 | } | |
1331 | ||
86872cb5 | 1332 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1333 | { |
1334 | int err; | |
c71099ac | 1335 | struct fib6_table *table; |
c346dca1 | 1336 | struct net *net = dev_net(rt->rt6i_dev); |
1da177e4 | 1337 | |
8ed67789 | 1338 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1339 | return -ENOENT; |
1340 | ||
c71099ac TG |
1341 | table = rt->rt6i_table; |
1342 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1343 | |
86872cb5 | 1344 | err = fib6_del(rt, info); |
d8d1f30b | 1345 | dst_release(&rt->dst); |
1da177e4 | 1346 | |
c71099ac | 1347 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1348 | |
1349 | return err; | |
1350 | } | |
1351 | ||
e0a1ad73 TG |
1352 | int ip6_del_rt(struct rt6_info *rt) |
1353 | { | |
4d1169c1 | 1354 | struct nl_info info = { |
c346dca1 | 1355 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 1356 | }; |
528c4ceb | 1357 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1358 | } |
1359 | ||
86872cb5 | 1360 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1361 | { |
c71099ac | 1362 | struct fib6_table *table; |
1da177e4 LT |
1363 | struct fib6_node *fn; |
1364 | struct rt6_info *rt; | |
1365 | int err = -ESRCH; | |
1366 | ||
5578689a | 1367 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1368 | if (table == NULL) |
1369 | return err; | |
1370 | ||
1371 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1372 | |
c71099ac | 1373 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1374 | &cfg->fc_dst, cfg->fc_dst_len, |
1375 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1376 | |
1da177e4 | 1377 | if (fn) { |
d8d1f30b | 1378 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1379 | if (cfg->fc_ifindex && |
1da177e4 | 1380 | (rt->rt6i_dev == NULL || |
86872cb5 | 1381 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1382 | continue; |
86872cb5 TG |
1383 | if (cfg->fc_flags & RTF_GATEWAY && |
1384 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1385 | continue; |
86872cb5 | 1386 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1387 | continue; |
d8d1f30b | 1388 | dst_hold(&rt->dst); |
c71099ac | 1389 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1390 | |
86872cb5 | 1391 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1392 | } |
1393 | } | |
c71099ac | 1394 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1395 | |
1396 | return err; | |
1397 | } | |
1398 | ||
1399 | /* | |
1400 | * Handle redirects | |
1401 | */ | |
a6279458 YH |
1402 | struct ip6rd_flowi { |
1403 | struct flowi fl; | |
1404 | struct in6_addr gateway; | |
1405 | }; | |
1406 | ||
8ed67789 DL |
1407 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1408 | struct fib6_table *table, | |
a6279458 YH |
1409 | struct flowi *fl, |
1410 | int flags) | |
1da177e4 | 1411 | { |
a6279458 YH |
1412 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1413 | struct rt6_info *rt; | |
e843b9e1 | 1414 | struct fib6_node *fn; |
c71099ac | 1415 | |
1da177e4 | 1416 | /* |
e843b9e1 YH |
1417 | * Get the "current" route for this destination and |
1418 | * check if the redirect has come from approriate router. | |
1419 | * | |
1420 | * RFC 2461 specifies that redirects should only be | |
1421 | * accepted if they come from the nexthop to the target. | |
1422 | * Due to the way the routes are chosen, this notion | |
1423 | * is a bit fuzzy and one might need to check all possible | |
1424 | * routes. | |
1da177e4 | 1425 | */ |
1da177e4 | 1426 | |
c71099ac | 1427 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1428 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1429 | restart: |
d8d1f30b | 1430 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
e843b9e1 YH |
1431 | /* |
1432 | * Current route is on-link; redirect is always invalid. | |
1433 | * | |
1434 | * Seems, previous statement is not true. It could | |
1435 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1436 | * But then router serving it might decide, that we should | |
1437 | * know truth 8)8) --ANK (980726). | |
1438 | */ | |
1439 | if (rt6_check_expired(rt)) | |
1440 | continue; | |
1441 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1442 | continue; | |
a6279458 | 1443 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1444 | continue; |
a6279458 | 1445 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1446 | continue; |
1447 | break; | |
1448 | } | |
a6279458 | 1449 | |
cb15d9c2 | 1450 | if (!rt) |
8ed67789 DL |
1451 | rt = net->ipv6.ip6_null_entry; |
1452 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1453 | out: |
d8d1f30b | 1454 | dst_hold(&rt->dst); |
a6279458 | 1455 | |
c71099ac | 1456 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1457 | |
a6279458 YH |
1458 | return rt; |
1459 | }; | |
1460 | ||
1461 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1462 | struct in6_addr *src, | |
1463 | struct in6_addr *gateway, | |
1464 | struct net_device *dev) | |
1465 | { | |
adaa70bb | 1466 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1467 | struct net *net = dev_net(dev); |
a6279458 YH |
1468 | struct ip6rd_flowi rdfl = { |
1469 | .fl = { | |
1470 | .oif = dev->ifindex, | |
5811662b CG |
1471 | .fl6_dst = *dest, |
1472 | .fl6_src = *src, | |
a6279458 | 1473 | }, |
a6279458 | 1474 | }; |
adaa70bb | 1475 | |
86c36ce4 BH |
1476 | ipv6_addr_copy(&rdfl.gateway, gateway); |
1477 | ||
adaa70bb TG |
1478 | if (rt6_need_strict(dest)) |
1479 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1480 | |
5578689a | 1481 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1482 | flags, __ip6_route_redirect); |
a6279458 YH |
1483 | } |
1484 | ||
1485 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1486 | struct in6_addr *saddr, | |
1487 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1488 | { | |
1489 | struct rt6_info *rt, *nrt = NULL; | |
1490 | struct netevent_redirect netevent; | |
c346dca1 | 1491 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1492 | |
1493 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1494 | ||
8ed67789 | 1495 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1496 | if (net_ratelimit()) |
1497 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1498 | "for redirect target\n"); | |
a6279458 | 1499 | goto out; |
1da177e4 LT |
1500 | } |
1501 | ||
1da177e4 LT |
1502 | /* |
1503 | * We have finally decided to accept it. | |
1504 | */ | |
1505 | ||
1ab1457c | 1506 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1507 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1508 | NEIGH_UPDATE_F_OVERRIDE| | |
1509 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1510 | NEIGH_UPDATE_F_ISROUTER)) | |
1511 | ); | |
1512 | ||
1513 | /* | |
1514 | * Redirect received -> path was valid. | |
1515 | * Look, redirects are sent only in response to data packets, | |
1516 | * so that this nexthop apparently is reachable. --ANK | |
1517 | */ | |
d8d1f30b | 1518 | dst_confirm(&rt->dst); |
1da177e4 LT |
1519 | |
1520 | /* Duplicate redirect: silently ignore. */ | |
d8d1f30b | 1521 | if (neigh == rt->dst.neighbour) |
1da177e4 LT |
1522 | goto out; |
1523 | ||
1524 | nrt = ip6_rt_copy(rt); | |
1525 | if (nrt == NULL) | |
1526 | goto out; | |
1527 | ||
1528 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1529 | if (on_link) | |
1530 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1531 | ||
1532 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1533 | nrt->rt6i_dst.plen = 128; | |
d8d1f30b | 1534 | nrt->dst.flags |= DST_HOST; |
1da177e4 LT |
1535 | |
1536 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1537 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1da177e4 | 1538 | |
40e22e8f | 1539 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1540 | goto out; |
1541 | ||
d8d1f30b CG |
1542 | netevent.old = &rt->dst; |
1543 | netevent.new = &nrt->dst; | |
8d71740c TT |
1544 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1545 | ||
1da177e4 | 1546 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1547 | ip6_del_rt(rt); |
1da177e4 LT |
1548 | return; |
1549 | } | |
1550 | ||
1551 | out: | |
d8d1f30b | 1552 | dst_release(&rt->dst); |
1da177e4 LT |
1553 | } |
1554 | ||
1555 | /* | |
1556 | * Handle ICMP "packet too big" messages | |
1557 | * i.e. Path MTU discovery | |
1558 | */ | |
1559 | ||
ae878ae2 MŻ |
1560 | static void rt6_do_pmtu_disc(struct in6_addr *daddr, struct in6_addr *saddr, |
1561 | struct net *net, u32 pmtu, int ifindex) | |
1da177e4 LT |
1562 | { |
1563 | struct rt6_info *rt, *nrt; | |
1564 | int allfrag = 0; | |
d3052b55 | 1565 | again: |
ae878ae2 | 1566 | rt = rt6_lookup(net, daddr, saddr, ifindex, 0); |
1da177e4 LT |
1567 | if (rt == NULL) |
1568 | return; | |
1569 | ||
d3052b55 AV |
1570 | if (rt6_check_expired(rt)) { |
1571 | ip6_del_rt(rt); | |
1572 | goto again; | |
1573 | } | |
1574 | ||
d8d1f30b | 1575 | if (pmtu >= dst_mtu(&rt->dst)) |
1da177e4 LT |
1576 | goto out; |
1577 | ||
1578 | if (pmtu < IPV6_MIN_MTU) { | |
1579 | /* | |
1ab1457c | 1580 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1581 | * MTU (1280) and a fragment header should always be included |
1582 | * after a node receiving Too Big message reporting PMTU is | |
1583 | * less than the IPv6 Minimum Link MTU. | |
1584 | */ | |
1585 | pmtu = IPV6_MIN_MTU; | |
1586 | allfrag = 1; | |
1587 | } | |
1588 | ||
1589 | /* New mtu received -> path was valid. | |
1590 | They are sent only in response to data packets, | |
1591 | so that this nexthop apparently is reachable. --ANK | |
1592 | */ | |
d8d1f30b | 1593 | dst_confirm(&rt->dst); |
1da177e4 LT |
1594 | |
1595 | /* Host route. If it is static, it would be better | |
1596 | not to override it, but add new one, so that | |
1597 | when cache entry will expire old pmtu | |
1598 | would return automatically. | |
1599 | */ | |
1600 | if (rt->rt6i_flags & RTF_CACHE) { | |
defb3519 DM |
1601 | dst_metric_set(&rt->dst, RTAX_MTU, pmtu); |
1602 | if (allfrag) { | |
1603 | u32 features = dst_metric(&rt->dst, RTAX_FEATURES); | |
1604 | features |= RTAX_FEATURE_ALLFRAG; | |
1605 | dst_metric_set(&rt->dst, RTAX_FEATURES, features); | |
1606 | } | |
d8d1f30b | 1607 | dst_set_expires(&rt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1608 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1609 | goto out; | |
1610 | } | |
1611 | ||
1612 | /* Network route. | |
1613 | Two cases are possible: | |
1614 | 1. It is connected route. Action: COW | |
1615 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1616 | */ | |
d5315b50 | 1617 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1618 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1619 | else |
1620 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1621 | |
d5315b50 | 1622 | if (nrt) { |
defb3519 DM |
1623 | dst_metric_set(&nrt->dst, RTAX_MTU, pmtu); |
1624 | if (allfrag) { | |
1625 | u32 features = dst_metric(&nrt->dst, RTAX_FEATURES); | |
1626 | features |= RTAX_FEATURE_ALLFRAG; | |
1627 | dst_metric_set(&nrt->dst, RTAX_FEATURES, features); | |
1628 | } | |
a1e78363 YH |
1629 | |
1630 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1631 | * happened within 5 mins, the recommended timer is 10 mins. | |
1632 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1633 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1634 | * and detecting PMTU increase will be automatically happened. | |
1635 | */ | |
d8d1f30b | 1636 | dst_set_expires(&nrt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1637 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1638 | ||
40e22e8f | 1639 | ip6_ins_rt(nrt); |
1da177e4 | 1640 | } |
1da177e4 | 1641 | out: |
d8d1f30b | 1642 | dst_release(&rt->dst); |
1da177e4 LT |
1643 | } |
1644 | ||
ae878ae2 MŻ |
1645 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, |
1646 | struct net_device *dev, u32 pmtu) | |
1647 | { | |
1648 | struct net *net = dev_net(dev); | |
1649 | ||
1650 | /* | |
1651 | * RFC 1981 states that a node "MUST reduce the size of the packets it | |
1652 | * is sending along the path" that caused the Packet Too Big message. | |
1653 | * Since it's not possible in the general case to determine which | |
1654 | * interface was used to send the original packet, we update the MTU | |
1655 | * on the interface that will be used to send future packets. We also | |
1656 | * update the MTU on the interface that received the Packet Too Big in | |
1657 | * case the original packet was forced out that interface with | |
1658 | * SO_BINDTODEVICE or similar. This is the next best thing to the | |
1659 | * correct behaviour, which would be to update the MTU on all | |
1660 | * interfaces. | |
1661 | */ | |
1662 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0); | |
1663 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex); | |
1664 | } | |
1665 | ||
1da177e4 LT |
1666 | /* |
1667 | * Misc support functions | |
1668 | */ | |
1669 | ||
1670 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1671 | { | |
c346dca1 | 1672 | struct net *net = dev_net(ort->rt6i_dev); |
86393e52 | 1673 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1674 | |
1675 | if (rt) { | |
d8d1f30b CG |
1676 | rt->dst.input = ort->dst.input; |
1677 | rt->dst.output = ort->dst.output; | |
1678 | ||
defb3519 | 1679 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b CG |
1680 | rt->dst.error = ort->dst.error; |
1681 | rt->dst.dev = ort->dst.dev; | |
1682 | if (rt->dst.dev) | |
1683 | dev_hold(rt->dst.dev); | |
1da177e4 LT |
1684 | rt->rt6i_idev = ort->rt6i_idev; |
1685 | if (rt->rt6i_idev) | |
1686 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1687 | rt->dst.lastuse = jiffies; |
1da177e4 LT |
1688 | rt->rt6i_expires = 0; |
1689 | ||
1690 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1691 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1692 | rt->rt6i_metric = 0; | |
1693 | ||
1694 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1695 | #ifdef CONFIG_IPV6_SUBTREES | |
1696 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1697 | #endif | |
c71099ac | 1698 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1699 | } |
1700 | return rt; | |
1701 | } | |
1702 | ||
70ceb4f5 | 1703 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1704 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1705 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1706 | struct in6_addr *gwaddr, int ifindex) |
1707 | { | |
1708 | struct fib6_node *fn; | |
1709 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1710 | struct fib6_table *table; |
1711 | ||
efa2cea0 | 1712 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1713 | if (table == NULL) |
1714 | return NULL; | |
70ceb4f5 | 1715 | |
c71099ac TG |
1716 | write_lock_bh(&table->tb6_lock); |
1717 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1718 | if (!fn) |
1719 | goto out; | |
1720 | ||
d8d1f30b | 1721 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
70ceb4f5 YH |
1722 | if (rt->rt6i_dev->ifindex != ifindex) |
1723 | continue; | |
1724 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1725 | continue; | |
1726 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1727 | continue; | |
d8d1f30b | 1728 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1729 | break; |
1730 | } | |
1731 | out: | |
c71099ac | 1732 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1733 | return rt; |
1734 | } | |
1735 | ||
efa2cea0 DL |
1736 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1737 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1738 | struct in6_addr *gwaddr, int ifindex, |
1739 | unsigned pref) | |
1740 | { | |
86872cb5 TG |
1741 | struct fib6_config cfg = { |
1742 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1743 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1744 | .fc_ifindex = ifindex, |
1745 | .fc_dst_len = prefixlen, | |
1746 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1747 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1748 | .fc_nlinfo.pid = 0, |
1749 | .fc_nlinfo.nlh = NULL, | |
1750 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1751 | }; |
1752 | ||
1753 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1754 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1755 | |
e317da96 YH |
1756 | /* We should treat it as a default route if prefix length is 0. */ |
1757 | if (!prefixlen) | |
86872cb5 | 1758 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1759 | |
86872cb5 | 1760 | ip6_route_add(&cfg); |
70ceb4f5 | 1761 | |
efa2cea0 | 1762 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1763 | } |
1764 | #endif | |
1765 | ||
1da177e4 | 1766 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1767 | { |
1da177e4 | 1768 | struct rt6_info *rt; |
c71099ac | 1769 | struct fib6_table *table; |
1da177e4 | 1770 | |
c346dca1 | 1771 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
c71099ac TG |
1772 | if (table == NULL) |
1773 | return NULL; | |
1da177e4 | 1774 | |
c71099ac | 1775 | write_lock_bh(&table->tb6_lock); |
d8d1f30b | 1776 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
1da177e4 | 1777 | if (dev == rt->rt6i_dev && |
045927ff | 1778 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1779 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1780 | break; | |
1781 | } | |
1782 | if (rt) | |
d8d1f30b | 1783 | dst_hold(&rt->dst); |
c71099ac | 1784 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1785 | return rt; |
1786 | } | |
1787 | ||
1788 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1789 | struct net_device *dev, |
1790 | unsigned int pref) | |
1da177e4 | 1791 | { |
86872cb5 TG |
1792 | struct fib6_config cfg = { |
1793 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1794 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1795 | .fc_ifindex = dev->ifindex, |
1796 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1797 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1798 | .fc_nlinfo.pid = 0, |
1799 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1800 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1801 | }; |
1da177e4 | 1802 | |
86872cb5 | 1803 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1804 | |
86872cb5 | 1805 | ip6_route_add(&cfg); |
1da177e4 | 1806 | |
1da177e4 LT |
1807 | return rt6_get_dflt_router(gwaddr, dev); |
1808 | } | |
1809 | ||
7b4da532 | 1810 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1811 | { |
1812 | struct rt6_info *rt; | |
c71099ac TG |
1813 | struct fib6_table *table; |
1814 | ||
1815 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1816 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1817 | if (table == NULL) |
1818 | return; | |
1da177e4 LT |
1819 | |
1820 | restart: | |
c71099ac | 1821 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1822 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1823 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1824 | dst_hold(&rt->dst); |
c71099ac | 1825 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1826 | ip6_del_rt(rt); |
1da177e4 LT |
1827 | goto restart; |
1828 | } | |
1829 | } | |
c71099ac | 1830 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1831 | } |
1832 | ||
5578689a DL |
1833 | static void rtmsg_to_fib6_config(struct net *net, |
1834 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1835 | struct fib6_config *cfg) |
1836 | { | |
1837 | memset(cfg, 0, sizeof(*cfg)); | |
1838 | ||
1839 | cfg->fc_table = RT6_TABLE_MAIN; | |
1840 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1841 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1842 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1843 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1844 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1845 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1846 | ||
5578689a | 1847 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1848 | |
86872cb5 TG |
1849 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1850 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1851 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1852 | } | |
1853 | ||
5578689a | 1854 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1855 | { |
86872cb5 | 1856 | struct fib6_config cfg; |
1da177e4 LT |
1857 | struct in6_rtmsg rtmsg; |
1858 | int err; | |
1859 | ||
1860 | switch(cmd) { | |
1861 | case SIOCADDRT: /* Add a route */ | |
1862 | case SIOCDELRT: /* Delete a route */ | |
1863 | if (!capable(CAP_NET_ADMIN)) | |
1864 | return -EPERM; | |
1865 | err = copy_from_user(&rtmsg, arg, | |
1866 | sizeof(struct in6_rtmsg)); | |
1867 | if (err) | |
1868 | return -EFAULT; | |
86872cb5 | 1869 | |
5578689a | 1870 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1871 | |
1da177e4 LT |
1872 | rtnl_lock(); |
1873 | switch (cmd) { | |
1874 | case SIOCADDRT: | |
86872cb5 | 1875 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1876 | break; |
1877 | case SIOCDELRT: | |
86872cb5 | 1878 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1879 | break; |
1880 | default: | |
1881 | err = -EINVAL; | |
1882 | } | |
1883 | rtnl_unlock(); | |
1884 | ||
1885 | return err; | |
3ff50b79 | 1886 | } |
1da177e4 LT |
1887 | |
1888 | return -EINVAL; | |
1889 | } | |
1890 | ||
1891 | /* | |
1892 | * Drop the packet on the floor | |
1893 | */ | |
1894 | ||
d5fdd6ba | 1895 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 1896 | { |
612f09e8 | 1897 | int type; |
adf30907 | 1898 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
1899 | switch (ipstats_mib_noroutes) { |
1900 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1901 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 1902 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
1903 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1904 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
1905 | break; |
1906 | } | |
1907 | /* FALLTHROUGH */ | |
1908 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
1909 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1910 | ipstats_mib_noroutes); | |
612f09e8 YH |
1911 | break; |
1912 | } | |
3ffe533c | 1913 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
1914 | kfree_skb(skb); |
1915 | return 0; | |
1916 | } | |
1917 | ||
9ce8ade0 TG |
1918 | static int ip6_pkt_discard(struct sk_buff *skb) |
1919 | { | |
612f09e8 | 1920 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1921 | } |
1922 | ||
20380731 | 1923 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 1924 | { |
adf30907 | 1925 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 1926 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1927 | } |
1928 | ||
6723ab54 DM |
1929 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1930 | ||
9ce8ade0 TG |
1931 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1932 | { | |
612f09e8 | 1933 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1934 | } |
1935 | ||
1936 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1937 | { | |
adf30907 | 1938 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 1939 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1940 | } |
1941 | ||
6723ab54 DM |
1942 | #endif |
1943 | ||
1da177e4 LT |
1944 | /* |
1945 | * Allocate a dst for local (unicast / anycast) address. | |
1946 | */ | |
1947 | ||
1948 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1949 | const struct in6_addr *addr, | |
1950 | int anycast) | |
1951 | { | |
c346dca1 | 1952 | struct net *net = dev_net(idev->dev); |
86393e52 | 1953 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
14deae41 | 1954 | struct neighbour *neigh; |
1da177e4 | 1955 | |
40385653 BG |
1956 | if (rt == NULL) { |
1957 | if (net_ratelimit()) | |
1958 | pr_warning("IPv6: Maximum number of routes reached," | |
1959 | " consider increasing route/max_size.\n"); | |
1da177e4 | 1960 | return ERR_PTR(-ENOMEM); |
40385653 | 1961 | } |
1da177e4 | 1962 | |
5578689a | 1963 | dev_hold(net->loopback_dev); |
1da177e4 LT |
1964 | in6_dev_hold(idev); |
1965 | ||
d8d1f30b CG |
1966 | rt->dst.flags = DST_HOST; |
1967 | rt->dst.input = ip6_input; | |
1968 | rt->dst.output = ip6_output; | |
5578689a | 1969 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 | 1970 | rt->rt6i_idev = idev; |
defb3519 | 1971 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, -1); |
d8d1f30b | 1972 | rt->dst.obsolete = -1; |
1da177e4 LT |
1973 | |
1974 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1975 | if (anycast) |
1976 | rt->rt6i_flags |= RTF_ANYCAST; | |
1977 | else | |
1da177e4 | 1978 | rt->rt6i_flags |= RTF_LOCAL; |
14deae41 DM |
1979 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); |
1980 | if (IS_ERR(neigh)) { | |
d8d1f30b | 1981 | dst_free(&rt->dst); |
14deae41 DM |
1982 | |
1983 | /* We are casting this because that is the return | |
1984 | * value type. But an errno encoded pointer is the | |
1985 | * same regardless of the underlying pointer type, | |
1986 | * and that's what we are returning. So this is OK. | |
1987 | */ | |
1988 | return (struct rt6_info *) neigh; | |
1da177e4 | 1989 | } |
14deae41 | 1990 | rt->rt6i_nexthop = neigh; |
1da177e4 LT |
1991 | |
1992 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1993 | rt->rt6i_dst.plen = 128; | |
5578689a | 1994 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 1995 | |
d8d1f30b | 1996 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
1997 | |
1998 | return rt; | |
1999 | } | |
2000 | ||
8ed67789 DL |
2001 | struct arg_dev_net { |
2002 | struct net_device *dev; | |
2003 | struct net *net; | |
2004 | }; | |
2005 | ||
1da177e4 LT |
2006 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2007 | { | |
bc3ef660 | 2008 | const struct arg_dev_net *adn = arg; |
2009 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2010 | |
bc3ef660 | 2011 | if ((rt->rt6i_dev == dev || dev == NULL) && |
2012 | rt != adn->net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
2013 | RT6_TRACE("deleted by ifdown %p\n", rt); |
2014 | return -1; | |
2015 | } | |
2016 | return 0; | |
2017 | } | |
2018 | ||
f3db4851 | 2019 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2020 | { |
8ed67789 DL |
2021 | struct arg_dev_net adn = { |
2022 | .dev = dev, | |
2023 | .net = net, | |
2024 | }; | |
2025 | ||
2026 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2027 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2028 | } |
2029 | ||
2030 | struct rt6_mtu_change_arg | |
2031 | { | |
2032 | struct net_device *dev; | |
2033 | unsigned mtu; | |
2034 | }; | |
2035 | ||
2036 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2037 | { | |
2038 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2039 | struct inet6_dev *idev; | |
2040 | ||
2041 | /* In IPv6 pmtu discovery is not optional, | |
2042 | so that RTAX_MTU lock cannot disable it. | |
2043 | We still use this lock to block changes | |
2044 | caused by addrconf/ndisc. | |
2045 | */ | |
2046 | ||
2047 | idev = __in6_dev_get(arg->dev); | |
2048 | if (idev == NULL) | |
2049 | return 0; | |
2050 | ||
2051 | /* For administrative MTU increase, there is no way to discover | |
2052 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2053 | Since RFC 1981 doesn't include administrative MTU increase | |
2054 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2055 | */ | |
2056 | /* | |
2057 | If new MTU is less than route PMTU, this new MTU will be the | |
2058 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2059 | decreases; if new MTU is greater than route PMTU, and the | |
2060 | old MTU is the lowest MTU in the path, update the route PMTU | |
2061 | to reflect the increase. In this case if the other nodes' MTU | |
2062 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2063 | PMTU discouvery. | |
2064 | */ | |
2065 | if (rt->rt6i_dev == arg->dev && | |
d8d1f30b CG |
2066 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2067 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2068 | (dst_mtu(&rt->dst) < arg->mtu && | |
2069 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2070 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2071 | } |
1da177e4 LT |
2072 | return 0; |
2073 | } | |
2074 | ||
2075 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
2076 | { | |
c71099ac TG |
2077 | struct rt6_mtu_change_arg arg = { |
2078 | .dev = dev, | |
2079 | .mtu = mtu, | |
2080 | }; | |
1da177e4 | 2081 | |
c346dca1 | 2082 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2083 | } |
2084 | ||
ef7c79ed | 2085 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2086 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2087 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2088 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2089 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2090 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2091 | }; | |
2092 | ||
2093 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2094 | struct fib6_config *cfg) | |
1da177e4 | 2095 | { |
86872cb5 TG |
2096 | struct rtmsg *rtm; |
2097 | struct nlattr *tb[RTA_MAX+1]; | |
2098 | int err; | |
1da177e4 | 2099 | |
86872cb5 TG |
2100 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2101 | if (err < 0) | |
2102 | goto errout; | |
1da177e4 | 2103 | |
86872cb5 TG |
2104 | err = -EINVAL; |
2105 | rtm = nlmsg_data(nlh); | |
2106 | memset(cfg, 0, sizeof(*cfg)); | |
2107 | ||
2108 | cfg->fc_table = rtm->rtm_table; | |
2109 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2110 | cfg->fc_src_len = rtm->rtm_src_len; | |
2111 | cfg->fc_flags = RTF_UP; | |
2112 | cfg->fc_protocol = rtm->rtm_protocol; | |
2113 | ||
2114 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2115 | cfg->fc_flags |= RTF_REJECT; | |
2116 | ||
ab79ad14 MŻ |
2117 | if (rtm->rtm_type == RTN_LOCAL) |
2118 | cfg->fc_flags |= RTF_LOCAL; | |
2119 | ||
86872cb5 TG |
2120 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
2121 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2122 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2123 | |
2124 | if (tb[RTA_GATEWAY]) { | |
2125 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2126 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2127 | } |
86872cb5 TG |
2128 | |
2129 | if (tb[RTA_DST]) { | |
2130 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2131 | ||
2132 | if (nla_len(tb[RTA_DST]) < plen) | |
2133 | goto errout; | |
2134 | ||
2135 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2136 | } |
86872cb5 TG |
2137 | |
2138 | if (tb[RTA_SRC]) { | |
2139 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2140 | ||
2141 | if (nla_len(tb[RTA_SRC]) < plen) | |
2142 | goto errout; | |
2143 | ||
2144 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2145 | } |
86872cb5 TG |
2146 | |
2147 | if (tb[RTA_OIF]) | |
2148 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2149 | ||
2150 | if (tb[RTA_PRIORITY]) | |
2151 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2152 | ||
2153 | if (tb[RTA_METRICS]) { | |
2154 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2155 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2156 | } |
86872cb5 TG |
2157 | |
2158 | if (tb[RTA_TABLE]) | |
2159 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2160 | ||
2161 | err = 0; | |
2162 | errout: | |
2163 | return err; | |
1da177e4 LT |
2164 | } |
2165 | ||
c127ea2c | 2166 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2167 | { |
86872cb5 TG |
2168 | struct fib6_config cfg; |
2169 | int err; | |
1da177e4 | 2170 | |
86872cb5 TG |
2171 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2172 | if (err < 0) | |
2173 | return err; | |
2174 | ||
2175 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2176 | } |
2177 | ||
c127ea2c | 2178 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2179 | { |
86872cb5 TG |
2180 | struct fib6_config cfg; |
2181 | int err; | |
1da177e4 | 2182 | |
86872cb5 TG |
2183 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2184 | if (err < 0) | |
2185 | return err; | |
2186 | ||
2187 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2188 | } |
2189 | ||
339bf98f TG |
2190 | static inline size_t rt6_nlmsg_size(void) |
2191 | { | |
2192 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2193 | + nla_total_size(16) /* RTA_SRC */ | |
2194 | + nla_total_size(16) /* RTA_DST */ | |
2195 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2196 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2197 | + nla_total_size(4) /* RTA_TABLE */ | |
2198 | + nla_total_size(4) /* RTA_IIF */ | |
2199 | + nla_total_size(4) /* RTA_OIF */ | |
2200 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2201 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2202 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2203 | } | |
2204 | ||
191cd582 BH |
2205 | static int rt6_fill_node(struct net *net, |
2206 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2207 | struct in6_addr *dst, struct in6_addr *src, |
2208 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2209 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2210 | { |
2211 | struct rtmsg *rtm; | |
2d7202bf | 2212 | struct nlmsghdr *nlh; |
e3703b3d | 2213 | long expires; |
9e762a4a | 2214 | u32 table; |
1da177e4 LT |
2215 | |
2216 | if (prefix) { /* user wants prefix routes only */ | |
2217 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2218 | /* success since this is not a prefix route */ | |
2219 | return 1; | |
2220 | } | |
2221 | } | |
2222 | ||
2d7202bf TG |
2223 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2224 | if (nlh == NULL) | |
26932566 | 2225 | return -EMSGSIZE; |
2d7202bf TG |
2226 | |
2227 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2228 | rtm->rtm_family = AF_INET6; |
2229 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2230 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2231 | rtm->rtm_tos = 0; | |
c71099ac | 2232 | if (rt->rt6i_table) |
9e762a4a | 2233 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2234 | else |
9e762a4a PM |
2235 | table = RT6_TABLE_UNSPEC; |
2236 | rtm->rtm_table = table; | |
2d7202bf | 2237 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2238 | if (rt->rt6i_flags&RTF_REJECT) |
2239 | rtm->rtm_type = RTN_UNREACHABLE; | |
ab79ad14 MŻ |
2240 | else if (rt->rt6i_flags&RTF_LOCAL) |
2241 | rtm->rtm_type = RTN_LOCAL; | |
1da177e4 LT |
2242 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) |
2243 | rtm->rtm_type = RTN_LOCAL; | |
2244 | else | |
2245 | rtm->rtm_type = RTN_UNICAST; | |
2246 | rtm->rtm_flags = 0; | |
2247 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2248 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2249 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2250 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2251 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2252 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2253 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2254 | rtm->rtm_protocol = RTPROT_RA; | |
2255 | ||
2256 | if (rt->rt6i_flags&RTF_CACHE) | |
2257 | rtm->rtm_flags |= RTM_F_CLONED; | |
2258 | ||
2259 | if (dst) { | |
2d7202bf | 2260 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2261 | rtm->rtm_dst_len = 128; |
1da177e4 | 2262 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2263 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2264 | #ifdef CONFIG_IPV6_SUBTREES |
2265 | if (src) { | |
2d7202bf | 2266 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2267 | rtm->rtm_src_len = 128; |
1da177e4 | 2268 | } else if (rtm->rtm_src_len) |
2d7202bf | 2269 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2270 | #endif |
7bc570c8 YH |
2271 | if (iif) { |
2272 | #ifdef CONFIG_IPV6_MROUTE | |
2273 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2274 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2275 | if (err <= 0) { |
2276 | if (!nowait) { | |
2277 | if (err == 0) | |
2278 | return 0; | |
2279 | goto nla_put_failure; | |
2280 | } else { | |
2281 | if (err == -EMSGSIZE) | |
2282 | goto nla_put_failure; | |
2283 | } | |
2284 | } | |
2285 | } else | |
2286 | #endif | |
2287 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2288 | } else if (dst) { | |
d8d1f30b | 2289 | struct inet6_dev *idev = ip6_dst_idev(&rt->dst); |
1da177e4 | 2290 | struct in6_addr saddr_buf; |
191cd582 | 2291 | if (ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, |
7cbca67c | 2292 | dst, 0, &saddr_buf) == 0) |
2d7202bf | 2293 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2294 | } |
2d7202bf | 2295 | |
defb3519 | 2296 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2297 | goto nla_put_failure; |
2298 | ||
d8d1f30b CG |
2299 | if (rt->dst.neighbour) |
2300 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->dst.neighbour->primary_key); | |
2d7202bf | 2301 | |
d8d1f30b | 2302 | if (rt->dst.dev) |
2d7202bf TG |
2303 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2304 | ||
2305 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2306 | |
36e3deae YH |
2307 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2308 | expires = 0; | |
2309 | else if (rt->rt6i_expires - jiffies < INT_MAX) | |
2310 | expires = rt->rt6i_expires - jiffies; | |
2311 | else | |
2312 | expires = INT_MAX; | |
69cdf8f9 | 2313 | |
d8d1f30b CG |
2314 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, |
2315 | expires, rt->dst.error) < 0) | |
e3703b3d | 2316 | goto nla_put_failure; |
2d7202bf TG |
2317 | |
2318 | return nlmsg_end(skb, nlh); | |
2319 | ||
2320 | nla_put_failure: | |
26932566 PM |
2321 | nlmsg_cancel(skb, nlh); |
2322 | return -EMSGSIZE; | |
1da177e4 LT |
2323 | } |
2324 | ||
1b43af54 | 2325 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2326 | { |
2327 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2328 | int prefix; | |
2329 | ||
2d7202bf TG |
2330 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2331 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2332 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2333 | } else | |
2334 | prefix = 0; | |
2335 | ||
191cd582 BH |
2336 | return rt6_fill_node(arg->net, |
2337 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2338 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2339 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2340 | } |
2341 | ||
c127ea2c | 2342 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2343 | { |
3b1e0a65 | 2344 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2345 | struct nlattr *tb[RTA_MAX+1]; |
2346 | struct rt6_info *rt; | |
1da177e4 | 2347 | struct sk_buff *skb; |
ab364a6f | 2348 | struct rtmsg *rtm; |
1da177e4 | 2349 | struct flowi fl; |
ab364a6f | 2350 | int err, iif = 0; |
1da177e4 | 2351 | |
ab364a6f TG |
2352 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2353 | if (err < 0) | |
2354 | goto errout; | |
1da177e4 | 2355 | |
ab364a6f | 2356 | err = -EINVAL; |
1da177e4 | 2357 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2358 | |
ab364a6f TG |
2359 | if (tb[RTA_SRC]) { |
2360 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2361 | goto errout; | |
2362 | ||
2363 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2364 | } | |
2365 | ||
2366 | if (tb[RTA_DST]) { | |
2367 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2368 | goto errout; | |
2369 | ||
2370 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2371 | } | |
2372 | ||
2373 | if (tb[RTA_IIF]) | |
2374 | iif = nla_get_u32(tb[RTA_IIF]); | |
2375 | ||
2376 | if (tb[RTA_OIF]) | |
2377 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2378 | |
2379 | if (iif) { | |
2380 | struct net_device *dev; | |
5578689a | 2381 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2382 | if (!dev) { |
2383 | err = -ENODEV; | |
ab364a6f | 2384 | goto errout; |
1da177e4 LT |
2385 | } |
2386 | } | |
2387 | ||
ab364a6f TG |
2388 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2389 | if (skb == NULL) { | |
2390 | err = -ENOBUFS; | |
2391 | goto errout; | |
2392 | } | |
1da177e4 | 2393 | |
ab364a6f TG |
2394 | /* Reserve room for dummy headers, this skb can pass |
2395 | through good chunk of routing engine. | |
2396 | */ | |
459a98ed | 2397 | skb_reset_mac_header(skb); |
ab364a6f | 2398 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2399 | |
8a3edd80 | 2400 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl); |
d8d1f30b | 2401 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2402 | |
191cd582 | 2403 | err = rt6_fill_node(net, skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2404 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2405 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2406 | if (err < 0) { |
ab364a6f TG |
2407 | kfree_skb(skb); |
2408 | goto errout; | |
1da177e4 LT |
2409 | } |
2410 | ||
5578689a | 2411 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2412 | errout: |
1da177e4 | 2413 | return err; |
1da177e4 LT |
2414 | } |
2415 | ||
86872cb5 | 2416 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2417 | { |
2418 | struct sk_buff *skb; | |
5578689a | 2419 | struct net *net = info->nl_net; |
528c4ceb DL |
2420 | u32 seq; |
2421 | int err; | |
2422 | ||
2423 | err = -ENOBUFS; | |
2424 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2425 | |
339bf98f | 2426 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2427 | if (skb == NULL) |
2428 | goto errout; | |
2429 | ||
191cd582 | 2430 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2431 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2432 | if (err < 0) { |
2433 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2434 | WARN_ON(err == -EMSGSIZE); | |
2435 | kfree_skb(skb); | |
2436 | goto errout; | |
2437 | } | |
1ce85fe4 PNA |
2438 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2439 | info->nlh, gfp_any()); | |
2440 | return; | |
21713ebc TG |
2441 | errout: |
2442 | if (err < 0) | |
5578689a | 2443 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2444 | } |
2445 | ||
8ed67789 DL |
2446 | static int ip6_route_dev_notify(struct notifier_block *this, |
2447 | unsigned long event, void *data) | |
2448 | { | |
2449 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2450 | struct net *net = dev_net(dev); |
8ed67789 DL |
2451 | |
2452 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2453 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2454 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2455 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2456 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2457 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2458 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2459 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2460 | #endif | |
2461 | } | |
2462 | ||
2463 | return NOTIFY_OK; | |
2464 | } | |
2465 | ||
1da177e4 LT |
2466 | /* |
2467 | * /proc | |
2468 | */ | |
2469 | ||
2470 | #ifdef CONFIG_PROC_FS | |
2471 | ||
1da177e4 LT |
2472 | struct rt6_proc_arg |
2473 | { | |
2474 | char *buffer; | |
2475 | int offset; | |
2476 | int length; | |
2477 | int skip; | |
2478 | int len; | |
2479 | }; | |
2480 | ||
2481 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2482 | { | |
33120b30 | 2483 | struct seq_file *m = p_arg; |
1da177e4 | 2484 | |
4b7a4274 | 2485 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2486 | |
2487 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2488 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2489 | #else |
33120b30 | 2490 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2491 | #endif |
2492 | ||
2493 | if (rt->rt6i_nexthop) { | |
4b7a4274 | 2494 | seq_printf(m, "%pi6", rt->rt6i_nexthop->primary_key); |
1da177e4 | 2495 | } else { |
33120b30 | 2496 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2497 | } |
33120b30 | 2498 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2499 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2500 | rt->dst.__use, rt->rt6i_flags, | |
33120b30 | 2501 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); |
1da177e4 LT |
2502 | return 0; |
2503 | } | |
2504 | ||
33120b30 | 2505 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2506 | { |
f3db4851 DL |
2507 | struct net *net = (struct net *)m->private; |
2508 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2509 | return 0; |
2510 | } | |
1da177e4 | 2511 | |
33120b30 AD |
2512 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2513 | { | |
de05c557 | 2514 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2515 | } |
2516 | ||
33120b30 AD |
2517 | static const struct file_operations ipv6_route_proc_fops = { |
2518 | .owner = THIS_MODULE, | |
2519 | .open = ipv6_route_open, | |
2520 | .read = seq_read, | |
2521 | .llseek = seq_lseek, | |
b6fcbdb4 | 2522 | .release = single_release_net, |
33120b30 AD |
2523 | }; |
2524 | ||
1da177e4 LT |
2525 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2526 | { | |
69ddb805 | 2527 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2528 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2529 | net->ipv6.rt6_stats->fib_nodes, |
2530 | net->ipv6.rt6_stats->fib_route_nodes, | |
2531 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2532 | net->ipv6.rt6_stats->fib_rt_entries, | |
2533 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2534 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2535 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2536 | |
2537 | return 0; | |
2538 | } | |
2539 | ||
2540 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2541 | { | |
de05c557 | 2542 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2543 | } |
2544 | ||
9a32144e | 2545 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2546 | .owner = THIS_MODULE, |
2547 | .open = rt6_stats_seq_open, | |
2548 | .read = seq_read, | |
2549 | .llseek = seq_lseek, | |
b6fcbdb4 | 2550 | .release = single_release_net, |
1da177e4 LT |
2551 | }; |
2552 | #endif /* CONFIG_PROC_FS */ | |
2553 | ||
2554 | #ifdef CONFIG_SYSCTL | |
2555 | ||
1da177e4 | 2556 | static |
8d65af78 | 2557 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2558 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2559 | { | |
c486da34 LAG |
2560 | struct net *net; |
2561 | int delay; | |
2562 | if (!write) | |
1da177e4 | 2563 | return -EINVAL; |
c486da34 LAG |
2564 | |
2565 | net = (struct net *)ctl->extra1; | |
2566 | delay = net->ipv6.sysctl.flush_delay; | |
2567 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2568 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); | |
2569 | return 0; | |
1da177e4 LT |
2570 | } |
2571 | ||
760f2d01 | 2572 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2573 | { |
1da177e4 | 2574 | .procname = "flush", |
4990509f | 2575 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2576 | .maxlen = sizeof(int), |
89c8b3a1 | 2577 | .mode = 0200, |
6d9f239a | 2578 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2579 | }, |
2580 | { | |
1da177e4 | 2581 | .procname = "gc_thresh", |
9a7ec3a9 | 2582 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2583 | .maxlen = sizeof(int), |
2584 | .mode = 0644, | |
6d9f239a | 2585 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2586 | }, |
2587 | { | |
1da177e4 | 2588 | .procname = "max_size", |
4990509f | 2589 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2590 | .maxlen = sizeof(int), |
2591 | .mode = 0644, | |
6d9f239a | 2592 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2593 | }, |
2594 | { | |
1da177e4 | 2595 | .procname = "gc_min_interval", |
4990509f | 2596 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2597 | .maxlen = sizeof(int), |
2598 | .mode = 0644, | |
6d9f239a | 2599 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2600 | }, |
2601 | { | |
1da177e4 | 2602 | .procname = "gc_timeout", |
4990509f | 2603 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2604 | .maxlen = sizeof(int), |
2605 | .mode = 0644, | |
6d9f239a | 2606 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2607 | }, |
2608 | { | |
1da177e4 | 2609 | .procname = "gc_interval", |
4990509f | 2610 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2611 | .maxlen = sizeof(int), |
2612 | .mode = 0644, | |
6d9f239a | 2613 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2614 | }, |
2615 | { | |
1da177e4 | 2616 | .procname = "gc_elasticity", |
4990509f | 2617 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2618 | .maxlen = sizeof(int), |
2619 | .mode = 0644, | |
f3d3f616 | 2620 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2621 | }, |
2622 | { | |
1da177e4 | 2623 | .procname = "mtu_expires", |
4990509f | 2624 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2625 | .maxlen = sizeof(int), |
2626 | .mode = 0644, | |
6d9f239a | 2627 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2628 | }, |
2629 | { | |
1da177e4 | 2630 | .procname = "min_adv_mss", |
4990509f | 2631 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2632 | .maxlen = sizeof(int), |
2633 | .mode = 0644, | |
f3d3f616 | 2634 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2635 | }, |
2636 | { | |
1da177e4 | 2637 | .procname = "gc_min_interval_ms", |
4990509f | 2638 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2639 | .maxlen = sizeof(int), |
2640 | .mode = 0644, | |
6d9f239a | 2641 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2642 | }, |
f8572d8f | 2643 | { } |
1da177e4 LT |
2644 | }; |
2645 | ||
2c8c1e72 | 2646 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2647 | { |
2648 | struct ctl_table *table; | |
2649 | ||
2650 | table = kmemdup(ipv6_route_table_template, | |
2651 | sizeof(ipv6_route_table_template), | |
2652 | GFP_KERNEL); | |
5ee09105 YH |
2653 | |
2654 | if (table) { | |
2655 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2656 | table[0].extra1 = net; |
86393e52 | 2657 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2658 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2659 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2660 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2661 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2662 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2663 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2664 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2665 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2666 | } |
2667 | ||
760f2d01 DL |
2668 | return table; |
2669 | } | |
1da177e4 LT |
2670 | #endif |
2671 | ||
2c8c1e72 | 2672 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2673 | { |
633d424b | 2674 | int ret = -ENOMEM; |
8ed67789 | 2675 | |
86393e52 AD |
2676 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2677 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2678 | |
fc66f95c ED |
2679 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2680 | goto out_ip6_dst_ops; | |
2681 | ||
8ed67789 DL |
2682 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2683 | sizeof(*net->ipv6.ip6_null_entry), | |
2684 | GFP_KERNEL); | |
2685 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2686 | goto out_ip6_dst_entries; |
d8d1f30b | 2687 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2688 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2689 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
defb3519 | 2690 | dst_metric_set(&net->ipv6.ip6_null_entry->dst, RTAX_HOPLIMIT, 255); |
8ed67789 DL |
2691 | |
2692 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2693 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2694 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2695 | GFP_KERNEL); | |
68fffc67 PZ |
2696 | if (!net->ipv6.ip6_prohibit_entry) |
2697 | goto out_ip6_null_entry; | |
d8d1f30b | 2698 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2699 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2700 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
defb3519 | 2701 | dst_metric_set(&net->ipv6.ip6_prohibit_entry->dst, RTAX_HOPLIMIT, 255); |
8ed67789 DL |
2702 | |
2703 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2704 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2705 | GFP_KERNEL); | |
68fffc67 PZ |
2706 | if (!net->ipv6.ip6_blk_hole_entry) |
2707 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2708 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2709 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2710 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
defb3519 | 2711 | dst_metric_set(&net->ipv6.ip6_blk_hole_entry->dst, RTAX_HOPLIMIT, 255); |
8ed67789 DL |
2712 | #endif |
2713 | ||
b339a47c PZ |
2714 | net->ipv6.sysctl.flush_delay = 0; |
2715 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2716 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2717 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2718 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2719 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2720 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2721 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2722 | ||
cdb18761 DL |
2723 | #ifdef CONFIG_PROC_FS |
2724 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2725 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2726 | #endif | |
6891a346 BT |
2727 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2728 | ||
8ed67789 DL |
2729 | ret = 0; |
2730 | out: | |
2731 | return ret; | |
f2fc6a54 | 2732 | |
68fffc67 PZ |
2733 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2734 | out_ip6_prohibit_entry: | |
2735 | kfree(net->ipv6.ip6_prohibit_entry); | |
2736 | out_ip6_null_entry: | |
2737 | kfree(net->ipv6.ip6_null_entry); | |
2738 | #endif | |
fc66f95c ED |
2739 | out_ip6_dst_entries: |
2740 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2741 | out_ip6_dst_ops: |
f2fc6a54 | 2742 | goto out; |
cdb18761 DL |
2743 | } |
2744 | ||
2c8c1e72 | 2745 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 DL |
2746 | { |
2747 | #ifdef CONFIG_PROC_FS | |
2748 | proc_net_remove(net, "ipv6_route"); | |
2749 | proc_net_remove(net, "rt6_stats"); | |
2750 | #endif | |
8ed67789 DL |
2751 | kfree(net->ipv6.ip6_null_entry); |
2752 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2753 | kfree(net->ipv6.ip6_prohibit_entry); | |
2754 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2755 | #endif | |
41bb78b4 | 2756 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2757 | } |
2758 | ||
2759 | static struct pernet_operations ip6_route_net_ops = { | |
2760 | .init = ip6_route_net_init, | |
2761 | .exit = ip6_route_net_exit, | |
2762 | }; | |
2763 | ||
8ed67789 DL |
2764 | static struct notifier_block ip6_route_dev_notifier = { |
2765 | .notifier_call = ip6_route_dev_notify, | |
2766 | .priority = 0, | |
2767 | }; | |
2768 | ||
433d49c3 | 2769 | int __init ip6_route_init(void) |
1da177e4 | 2770 | { |
433d49c3 DL |
2771 | int ret; |
2772 | ||
9a7ec3a9 DL |
2773 | ret = -ENOMEM; |
2774 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2775 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2776 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2777 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 2778 | goto out; |
14e50e57 | 2779 | |
fc66f95c | 2780 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 2781 | if (ret) |
bdb3289f | 2782 | goto out_kmem_cache; |
bdb3289f | 2783 | |
fc66f95c ED |
2784 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2785 | if (ret) | |
2786 | goto out_dst_entries; | |
2787 | ||
5dc121e9 AE |
2788 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2789 | ||
8ed67789 DL |
2790 | /* Registering of the loopback is done before this portion of code, |
2791 | * the loopback reference in rt6_info will not be taken, do it | |
2792 | * manually for init_net */ | |
d8d1f30b | 2793 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2794 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2795 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2796 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 2797 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 2798 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2799 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2800 | #endif | |
433d49c3 DL |
2801 | ret = fib6_init(); |
2802 | if (ret) | |
8ed67789 | 2803 | goto out_register_subsys; |
433d49c3 | 2804 | |
433d49c3 DL |
2805 | ret = xfrm6_init(); |
2806 | if (ret) | |
cdb18761 | 2807 | goto out_fib6_init; |
c35b7e72 | 2808 | |
433d49c3 DL |
2809 | ret = fib6_rules_init(); |
2810 | if (ret) | |
2811 | goto xfrm6_init; | |
7e5449c2 | 2812 | |
433d49c3 DL |
2813 | ret = -ENOBUFS; |
2814 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2815 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2816 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2817 | goto fib6_rules_init; | |
c127ea2c | 2818 | |
8ed67789 | 2819 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2820 | if (ret) |
2821 | goto fib6_rules_init; | |
8ed67789 | 2822 | |
433d49c3 DL |
2823 | out: |
2824 | return ret; | |
2825 | ||
2826 | fib6_rules_init: | |
433d49c3 DL |
2827 | fib6_rules_cleanup(); |
2828 | xfrm6_init: | |
433d49c3 | 2829 | xfrm6_fini(); |
433d49c3 | 2830 | out_fib6_init: |
433d49c3 | 2831 | fib6_gc_cleanup(); |
8ed67789 DL |
2832 | out_register_subsys: |
2833 | unregister_pernet_subsys(&ip6_route_net_ops); | |
fc66f95c ED |
2834 | out_dst_entries: |
2835 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 2836 | out_kmem_cache: |
f2fc6a54 | 2837 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2838 | goto out; |
1da177e4 LT |
2839 | } |
2840 | ||
2841 | void ip6_route_cleanup(void) | |
2842 | { | |
8ed67789 | 2843 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2844 | fib6_rules_cleanup(); |
1da177e4 | 2845 | xfrm6_fini(); |
1da177e4 | 2846 | fib6_gc_cleanup(); |
8ed67789 | 2847 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 2848 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 2849 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2850 | } |