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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | /* Changes: | |
17 | * | |
18 | * YOSHIFUJI Hideaki @USAGI | |
19 | * reworked default router selection. | |
20 | * - respect outgoing interface | |
21 | * - select from (probably) reachable routers (i.e. | |
22 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
23 | * - always select the same router if it is (probably) | |
24 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
25 | * Ville Nuorvala |
26 | * Fixed routing subtrees. | |
1da177e4 LT |
27 | */ |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 LT |
30 | #include <linux/errno.h> |
31 | #include <linux/types.h> | |
32 | #include <linux/times.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/sockios.h> | |
35 | #include <linux/net.h> | |
36 | #include <linux/route.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/in6.h> | |
39 | #include <linux/init.h> | |
1da177e4 | 40 | #include <linux/if_arp.h> |
1da177e4 LT |
41 | #include <linux/proc_fs.h> |
42 | #include <linux/seq_file.h> | |
5b7c931d | 43 | #include <linux/nsproxy.h> |
457c4cbc | 44 | #include <net/net_namespace.h> |
1da177e4 LT |
45 | #include <net/snmp.h> |
46 | #include <net/ipv6.h> | |
47 | #include <net/ip6_fib.h> | |
48 | #include <net/ip6_route.h> | |
49 | #include <net/ndisc.h> | |
50 | #include <net/addrconf.h> | |
51 | #include <net/tcp.h> | |
52 | #include <linux/rtnetlink.h> | |
53 | #include <net/dst.h> | |
54 | #include <net/xfrm.h> | |
8d71740c | 55 | #include <net/netevent.h> |
21713ebc | 56 | #include <net/netlink.h> |
1da177e4 LT |
57 | |
58 | #include <asm/uaccess.h> | |
59 | ||
60 | #ifdef CONFIG_SYSCTL | |
61 | #include <linux/sysctl.h> | |
62 | #endif | |
63 | ||
64 | /* Set to 3 to get tracing. */ | |
65 | #define RT6_DEBUG 2 | |
66 | ||
67 | #if RT6_DEBUG >= 3 | |
68 | #define RDBG(x) printk x | |
69 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
70 | #else | |
71 | #define RDBG(x) | |
72 | #define RT6_TRACE(x...) do { ; } while (0) | |
73 | #endif | |
74 | ||
519fbd87 | 75 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 76 | |
1da177e4 LT |
77 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
78 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
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 LT |
101 | .family = AF_INET6, |
102 | .protocol = __constant_htons(ETH_P_IPV6), | |
103 | .gc = ip6_dst_gc, | |
104 | .gc_thresh = 1024, | |
105 | .check = ip6_dst_check, | |
106 | .destroy = ip6_dst_destroy, | |
107 | .ifdown = ip6_dst_ifdown, | |
108 | .negative_advice = ip6_negative_advice, | |
109 | .link_failure = ip6_link_failure, | |
110 | .update_pmtu = ip6_rt_update_pmtu, | |
862b82c6 | 111 | .local_out = ip6_local_out, |
1da177e4 | 112 | .entry_size = sizeof(struct rt6_info), |
e2422970 | 113 | .entries = ATOMIC_INIT(0), |
1da177e4 LT |
114 | }; |
115 | ||
14e50e57 DM |
116 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
117 | { | |
118 | } | |
119 | ||
120 | static struct dst_ops ip6_dst_blackhole_ops = { | |
121 | .family = AF_INET6, | |
122 | .protocol = __constant_htons(ETH_P_IPV6), | |
123 | .destroy = ip6_dst_destroy, | |
124 | .check = ip6_dst_check, | |
125 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
126 | .entry_size = sizeof(struct rt6_info), | |
e2422970 | 127 | .entries = ATOMIC_INIT(0), |
14e50e57 DM |
128 | }; |
129 | ||
bdb3289f | 130 | static struct rt6_info ip6_null_entry_template = { |
1da177e4 LT |
131 | .u = { |
132 | .dst = { | |
133 | .__refcnt = ATOMIC_INIT(1), | |
134 | .__use = 1, | |
1da177e4 LT |
135 | .obsolete = -1, |
136 | .error = -ENETUNREACH, | |
137 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
138 | .input = ip6_pkt_discard, | |
139 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
140 | } |
141 | }, | |
142 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
143 | .rt6i_metric = ~(u32) 0, | |
144 | .rt6i_ref = ATOMIC_INIT(1), | |
145 | }; | |
146 | ||
101367c2 TG |
147 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
148 | ||
6723ab54 DM |
149 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
150 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 151 | |
bdb3289f | 152 | struct rt6_info ip6_prohibit_entry_template = { |
101367c2 TG |
153 | .u = { |
154 | .dst = { | |
155 | .__refcnt = ATOMIC_INIT(1), | |
156 | .__use = 1, | |
101367c2 TG |
157 | .obsolete = -1, |
158 | .error = -EACCES, | |
159 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
160 | .input = ip6_pkt_prohibit, |
161 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
162 | } |
163 | }, | |
164 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
165 | .rt6i_metric = ~(u32) 0, | |
166 | .rt6i_ref = ATOMIC_INIT(1), | |
167 | }; | |
168 | ||
bdb3289f | 169 | static struct rt6_info ip6_blk_hole_entry_template = { |
101367c2 TG |
170 | .u = { |
171 | .dst = { | |
172 | .__refcnt = ATOMIC_INIT(1), | |
173 | .__use = 1, | |
101367c2 TG |
174 | .obsolete = -1, |
175 | .error = -EINVAL, | |
176 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
352e512c HX |
177 | .input = dst_discard, |
178 | .output = dst_discard, | |
101367c2 TG |
179 | } |
180 | }, | |
181 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
182 | .rt6i_metric = ~(u32) 0, | |
183 | .rt6i_ref = ATOMIC_INIT(1), | |
184 | }; | |
185 | ||
186 | #endif | |
187 | ||
1da177e4 | 188 | /* allocate dst with ip6_dst_ops */ |
f2fc6a54 | 189 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops) |
1da177e4 | 190 | { |
f2fc6a54 | 191 | return (struct rt6_info *)dst_alloc(ops); |
1da177e4 LT |
192 | } |
193 | ||
194 | static void ip6_dst_destroy(struct dst_entry *dst) | |
195 | { | |
196 | struct rt6_info *rt = (struct rt6_info *)dst; | |
197 | struct inet6_dev *idev = rt->rt6i_idev; | |
198 | ||
199 | if (idev != NULL) { | |
200 | rt->rt6i_idev = NULL; | |
201 | in6_dev_put(idev); | |
1ab1457c | 202 | } |
1da177e4 LT |
203 | } |
204 | ||
205 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
206 | int how) | |
207 | { | |
208 | struct rt6_info *rt = (struct rt6_info *)dst; | |
209 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 DL |
210 | struct net_device *loopback_dev = |
211 | dev->nd_net->loopback_dev; | |
1da177e4 | 212 | |
5a3e55d6 DL |
213 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
214 | struct inet6_dev *loopback_idev = | |
215 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
216 | if (loopback_idev != NULL) { |
217 | rt->rt6i_idev = loopback_idev; | |
218 | in6_dev_put(idev); | |
219 | } | |
220 | } | |
221 | } | |
222 | ||
223 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
224 | { | |
225 | return (rt->rt6i_flags & RTF_EXPIRES && | |
226 | time_after(jiffies, rt->rt6i_expires)); | |
227 | } | |
228 | ||
c71099ac TG |
229 | static inline int rt6_need_strict(struct in6_addr *daddr) |
230 | { | |
231 | return (ipv6_addr_type(daddr) & | |
232 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
233 | } | |
234 | ||
1da177e4 | 235 | /* |
c71099ac | 236 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
237 | */ |
238 | ||
8ed67789 DL |
239 | static inline struct rt6_info *rt6_device_match(struct net *net, |
240 | struct rt6_info *rt, | |
1da177e4 LT |
241 | int oif, |
242 | int strict) | |
243 | { | |
244 | struct rt6_info *local = NULL; | |
245 | struct rt6_info *sprt; | |
246 | ||
247 | if (oif) { | |
7cc48263 | 248 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
249 | struct net_device *dev = sprt->rt6i_dev; |
250 | if (dev->ifindex == oif) | |
251 | return sprt; | |
252 | if (dev->flags & IFF_LOOPBACK) { | |
253 | if (sprt->rt6i_idev == NULL || | |
254 | sprt->rt6i_idev->dev->ifindex != oif) { | |
255 | if (strict && oif) | |
256 | continue; | |
1ab1457c | 257 | if (local && (!oif || |
1da177e4 LT |
258 | local->rt6i_idev->dev->ifindex == oif)) |
259 | continue; | |
260 | } | |
261 | local = sprt; | |
262 | } | |
263 | } | |
264 | ||
265 | if (local) | |
266 | return local; | |
267 | ||
268 | if (strict) | |
8ed67789 | 269 | return net->ipv6.ip6_null_entry; |
1da177e4 LT |
270 | } |
271 | return rt; | |
272 | } | |
273 | ||
27097255 YH |
274 | #ifdef CONFIG_IPV6_ROUTER_PREF |
275 | static void rt6_probe(struct rt6_info *rt) | |
276 | { | |
277 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
278 | /* | |
279 | * Okay, this does not seem to be appropriate | |
280 | * for now, however, we need to check if it | |
281 | * is really so; aka Router Reachability Probing. | |
282 | * | |
283 | * Router Reachability Probe MUST be rate-limited | |
284 | * to no more than one per minute. | |
285 | */ | |
286 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
287 | return; | |
288 | read_lock_bh(&neigh->lock); | |
289 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 290 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
291 | struct in6_addr mcaddr; |
292 | struct in6_addr *target; | |
293 | ||
294 | neigh->updated = jiffies; | |
295 | read_unlock_bh(&neigh->lock); | |
296 | ||
297 | target = (struct in6_addr *)&neigh->primary_key; | |
298 | addrconf_addr_solict_mult(target, &mcaddr); | |
299 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
300 | } else | |
301 | read_unlock_bh(&neigh->lock); | |
302 | } | |
303 | #else | |
304 | static inline void rt6_probe(struct rt6_info *rt) | |
305 | { | |
306 | return; | |
307 | } | |
308 | #endif | |
309 | ||
1da177e4 | 310 | /* |
554cfb7e | 311 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 312 | */ |
b6f99a21 | 313 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
314 | { |
315 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 316 | if (!oif || dev->ifindex == oif) |
554cfb7e | 317 | return 2; |
161980f4 DM |
318 | if ((dev->flags & IFF_LOOPBACK) && |
319 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
320 | return 1; | |
321 | return 0; | |
554cfb7e | 322 | } |
1da177e4 | 323 | |
b6f99a21 | 324 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 325 | { |
554cfb7e | 326 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 327 | int m; |
4d0c5911 YH |
328 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
329 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
330 | m = 1; | |
331 | else if (neigh) { | |
554cfb7e YH |
332 | read_lock_bh(&neigh->lock); |
333 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 334 | m = 2; |
398bcbeb YH |
335 | #ifdef CONFIG_IPV6_ROUTER_PREF |
336 | else if (neigh->nud_state & NUD_FAILED) | |
337 | m = 0; | |
338 | #endif | |
339 | else | |
ea73ee23 | 340 | m = 1; |
554cfb7e | 341 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
342 | } else |
343 | m = 0; | |
554cfb7e | 344 | return m; |
1da177e4 LT |
345 | } |
346 | ||
554cfb7e YH |
347 | static int rt6_score_route(struct rt6_info *rt, int oif, |
348 | int strict) | |
1da177e4 | 349 | { |
4d0c5911 | 350 | int m, n; |
1ab1457c | 351 | |
4d0c5911 | 352 | m = rt6_check_dev(rt, oif); |
77d16f45 | 353 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 354 | return -1; |
ebacaaa0 YH |
355 | #ifdef CONFIG_IPV6_ROUTER_PREF |
356 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
357 | #endif | |
4d0c5911 | 358 | n = rt6_check_neigh(rt); |
557e92ef | 359 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
360 | return -1; |
361 | return m; | |
362 | } | |
363 | ||
f11e6659 DM |
364 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
365 | int *mpri, struct rt6_info *match) | |
554cfb7e | 366 | { |
f11e6659 DM |
367 | int m; |
368 | ||
369 | if (rt6_check_expired(rt)) | |
370 | goto out; | |
371 | ||
372 | m = rt6_score_route(rt, oif, strict); | |
373 | if (m < 0) | |
374 | goto out; | |
375 | ||
376 | if (m > *mpri) { | |
377 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
378 | rt6_probe(match); | |
379 | *mpri = m; | |
380 | match = rt; | |
381 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
382 | rt6_probe(rt); | |
383 | } | |
384 | ||
385 | out: | |
386 | return match; | |
387 | } | |
388 | ||
389 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
390 | struct rt6_info *rr_head, | |
391 | u32 metric, int oif, int strict) | |
392 | { | |
393 | struct rt6_info *rt, *match; | |
554cfb7e | 394 | int mpri = -1; |
1da177e4 | 395 | |
f11e6659 DM |
396 | match = NULL; |
397 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
398 | rt = rt->u.dst.rt6_next) | |
399 | match = find_match(rt, oif, strict, &mpri, match); | |
400 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
401 | rt = rt->u.dst.rt6_next) | |
402 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 403 | |
f11e6659 DM |
404 | return match; |
405 | } | |
1da177e4 | 406 | |
f11e6659 DM |
407 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
408 | { | |
409 | struct rt6_info *match, *rt0; | |
8ed67789 | 410 | struct net *net; |
1da177e4 | 411 | |
f11e6659 | 412 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 413 | __func__, fn->leaf, oif); |
554cfb7e | 414 | |
f11e6659 DM |
415 | rt0 = fn->rr_ptr; |
416 | if (!rt0) | |
417 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 418 | |
f11e6659 | 419 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 420 | |
554cfb7e | 421 | if (!match && |
f11e6659 DM |
422 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
423 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
424 | ||
554cfb7e | 425 | /* no entries matched; do round-robin */ |
f11e6659 DM |
426 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
427 | next = fn->leaf; | |
428 | ||
429 | if (next != rt0) | |
430 | fn->rr_ptr = next; | |
1da177e4 | 431 | } |
1da177e4 | 432 | |
f11e6659 | 433 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 434 | __func__, match); |
1da177e4 | 435 | |
8ed67789 DL |
436 | net = rt0->rt6i_dev->nd_net; |
437 | return (match ? match : net->ipv6.ip6_null_entry); | |
1da177e4 LT |
438 | } |
439 | ||
70ceb4f5 YH |
440 | #ifdef CONFIG_IPV6_ROUTE_INFO |
441 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
442 | struct in6_addr *gwaddr) | |
443 | { | |
efa2cea0 | 444 | struct net *net = dev->nd_net; |
70ceb4f5 YH |
445 | struct route_info *rinfo = (struct route_info *) opt; |
446 | struct in6_addr prefix_buf, *prefix; | |
447 | unsigned int pref; | |
448 | u32 lifetime; | |
449 | struct rt6_info *rt; | |
450 | ||
451 | if (len < sizeof(struct route_info)) { | |
452 | return -EINVAL; | |
453 | } | |
454 | ||
455 | /* Sanity check for prefix_len and length */ | |
456 | if (rinfo->length > 3) { | |
457 | return -EINVAL; | |
458 | } else if (rinfo->prefix_len > 128) { | |
459 | return -EINVAL; | |
460 | } else if (rinfo->prefix_len > 64) { | |
461 | if (rinfo->length < 2) { | |
462 | return -EINVAL; | |
463 | } | |
464 | } else if (rinfo->prefix_len > 0) { | |
465 | if (rinfo->length < 1) { | |
466 | return -EINVAL; | |
467 | } | |
468 | } | |
469 | ||
470 | pref = rinfo->route_pref; | |
471 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
472 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
473 | ||
e69a4adc | 474 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
475 | if (lifetime == 0xffffffff) { |
476 | /* infinity */ | |
477 | } else if (lifetime > 0x7fffffff/HZ) { | |
478 | /* Avoid arithmetic overflow */ | |
479 | lifetime = 0x7fffffff/HZ - 1; | |
480 | } | |
481 | ||
482 | if (rinfo->length == 3) | |
483 | prefix = (struct in6_addr *)rinfo->prefix; | |
484 | else { | |
485 | /* this function is safe */ | |
486 | ipv6_addr_prefix(&prefix_buf, | |
487 | (struct in6_addr *)rinfo->prefix, | |
488 | rinfo->prefix_len); | |
489 | prefix = &prefix_buf; | |
490 | } | |
491 | ||
efa2cea0 DL |
492 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
493 | dev->ifindex); | |
70ceb4f5 YH |
494 | |
495 | if (rt && !lifetime) { | |
e0a1ad73 | 496 | ip6_del_rt(rt); |
70ceb4f5 YH |
497 | rt = NULL; |
498 | } | |
499 | ||
500 | if (!rt && lifetime) | |
efa2cea0 | 501 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
502 | pref); |
503 | else if (rt) | |
504 | rt->rt6i_flags = RTF_ROUTEINFO | | |
505 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
506 | ||
507 | if (rt) { | |
508 | if (lifetime == 0xffffffff) { | |
509 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
510 | } else { | |
511 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
512 | rt->rt6i_flags |= RTF_EXPIRES; | |
513 | } | |
514 | dst_release(&rt->u.dst); | |
515 | } | |
516 | return 0; | |
517 | } | |
518 | #endif | |
519 | ||
8ed67789 | 520 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 521 | do { \ |
8ed67789 | 522 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 523 | struct fib6_node *pn; \ |
e0eda7bb | 524 | while (1) { \ |
982f56f3 YH |
525 | if (fn->fn_flags & RTN_TL_ROOT) \ |
526 | goto out; \ | |
527 | pn = fn->parent; \ | |
528 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 529 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
530 | else \ |
531 | fn = pn; \ | |
532 | if (fn->fn_flags & RTN_RTINFO) \ | |
533 | goto restart; \ | |
c71099ac | 534 | } \ |
c71099ac | 535 | } \ |
982f56f3 | 536 | } while(0) |
c71099ac | 537 | |
8ed67789 DL |
538 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
539 | struct fib6_table *table, | |
c71099ac | 540 | struct flowi *fl, int flags) |
1da177e4 LT |
541 | { |
542 | struct fib6_node *fn; | |
543 | struct rt6_info *rt; | |
544 | ||
c71099ac TG |
545 | read_lock_bh(&table->tb6_lock); |
546 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
547 | restart: | |
548 | rt = fn->leaf; | |
8ed67789 DL |
549 | rt = rt6_device_match(net, rt, fl->oif, flags); |
550 | BACKTRACK(net, &fl->fl6_src); | |
c71099ac | 551 | out: |
03f49f34 | 552 | dst_use(&rt->u.dst, jiffies); |
c71099ac | 553 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
554 | return rt; |
555 | ||
556 | } | |
557 | ||
606a2b48 DL |
558 | struct rt6_info *rt6_lookup(struct net *net, struct in6_addr *daddr, |
559 | struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
560 | { |
561 | struct flowi fl = { | |
562 | .oif = oif, | |
563 | .nl_u = { | |
564 | .ip6_u = { | |
565 | .daddr = *daddr, | |
c71099ac TG |
566 | }, |
567 | }, | |
568 | }; | |
569 | struct dst_entry *dst; | |
77d16f45 | 570 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 571 | |
adaa70bb TG |
572 | if (saddr) { |
573 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
574 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
575 | } | |
576 | ||
606a2b48 | 577 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
578 | if (dst->error == 0) |
579 | return (struct rt6_info *) dst; | |
580 | ||
581 | dst_release(dst); | |
582 | ||
1da177e4 LT |
583 | return NULL; |
584 | } | |
585 | ||
7159039a YH |
586 | EXPORT_SYMBOL(rt6_lookup); |
587 | ||
c71099ac | 588 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
589 | It takes new route entry, the addition fails by any reason the |
590 | route is freed. In any case, if caller does not hold it, it may | |
591 | be destroyed. | |
592 | */ | |
593 | ||
86872cb5 | 594 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
595 | { |
596 | int err; | |
c71099ac | 597 | struct fib6_table *table; |
1da177e4 | 598 | |
c71099ac TG |
599 | table = rt->rt6i_table; |
600 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 601 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 602 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
603 | |
604 | return err; | |
605 | } | |
606 | ||
40e22e8f TG |
607 | int ip6_ins_rt(struct rt6_info *rt) |
608 | { | |
4d1169c1 | 609 | struct nl_info info = { |
5578689a | 610 | .nl_net = rt->rt6i_dev->nd_net, |
4d1169c1 | 611 | }; |
528c4ceb | 612 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
613 | } |
614 | ||
95a9a5ba YH |
615 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
616 | struct in6_addr *saddr) | |
1da177e4 | 617 | { |
1da177e4 LT |
618 | struct rt6_info *rt; |
619 | ||
620 | /* | |
621 | * Clone the route. | |
622 | */ | |
623 | ||
624 | rt = ip6_rt_copy(ort); | |
625 | ||
626 | if (rt) { | |
58c4fb86 YH |
627 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
628 | if (rt->rt6i_dst.plen != 128 && | |
629 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
630 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 631 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 632 | } |
1da177e4 | 633 | |
58c4fb86 | 634 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
635 | rt->rt6i_dst.plen = 128; |
636 | rt->rt6i_flags |= RTF_CACHE; | |
637 | rt->u.dst.flags |= DST_HOST; | |
638 | ||
639 | #ifdef CONFIG_IPV6_SUBTREES | |
640 | if (rt->rt6i_src.plen && saddr) { | |
641 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
642 | rt->rt6i_src.plen = 128; | |
643 | } | |
644 | #endif | |
645 | ||
646 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
647 | ||
95a9a5ba | 648 | } |
1da177e4 | 649 | |
95a9a5ba YH |
650 | return rt; |
651 | } | |
1da177e4 | 652 | |
299d9939 YH |
653 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
654 | { | |
655 | struct rt6_info *rt = ip6_rt_copy(ort); | |
656 | if (rt) { | |
657 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
658 | rt->rt6i_dst.plen = 128; | |
659 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
660 | rt->u.dst.flags |= DST_HOST; |
661 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
662 | } | |
663 | return rt; | |
664 | } | |
665 | ||
8ed67789 DL |
666 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
667 | struct flowi *fl, int flags) | |
1da177e4 LT |
668 | { |
669 | struct fib6_node *fn; | |
519fbd87 | 670 | struct rt6_info *rt, *nrt; |
c71099ac | 671 | int strict = 0; |
1da177e4 | 672 | int attempts = 3; |
519fbd87 | 673 | int err; |
ea659e07 | 674 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 675 | |
77d16f45 | 676 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
677 | |
678 | relookup: | |
c71099ac | 679 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 680 | |
8238dd06 | 681 | restart_2: |
c71099ac | 682 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
683 | |
684 | restart: | |
4acad72d | 685 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 DL |
686 | |
687 | BACKTRACK(net, &fl->fl6_src); | |
688 | if (rt == net->ipv6.ip6_null_entry || | |
8238dd06 | 689 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 690 | goto out; |
1da177e4 | 691 | |
fb9de91e | 692 | dst_hold(&rt->u.dst); |
c71099ac | 693 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 694 | |
519fbd87 | 695 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 696 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
697 | else { |
698 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 699 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
700 | #else |
701 | goto out2; | |
702 | #endif | |
703 | } | |
e40cf353 | 704 | |
519fbd87 | 705 | dst_release(&rt->u.dst); |
8ed67789 | 706 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 707 | |
519fbd87 YH |
708 | dst_hold(&rt->u.dst); |
709 | if (nrt) { | |
40e22e8f | 710 | err = ip6_ins_rt(nrt); |
519fbd87 | 711 | if (!err) |
1da177e4 | 712 | goto out2; |
1da177e4 | 713 | } |
1da177e4 | 714 | |
519fbd87 YH |
715 | if (--attempts <= 0) |
716 | goto out2; | |
717 | ||
718 | /* | |
c71099ac | 719 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
720 | * released someone could insert this route. Relookup. |
721 | */ | |
722 | dst_release(&rt->u.dst); | |
723 | goto relookup; | |
724 | ||
725 | out: | |
8238dd06 YH |
726 | if (reachable) { |
727 | reachable = 0; | |
728 | goto restart_2; | |
729 | } | |
519fbd87 | 730 | dst_hold(&rt->u.dst); |
c71099ac | 731 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
732 | out2: |
733 | rt->u.dst.lastuse = jiffies; | |
734 | rt->u.dst.__use++; | |
c71099ac TG |
735 | |
736 | return rt; | |
1da177e4 LT |
737 | } |
738 | ||
8ed67789 | 739 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4acad72d PE |
740 | struct flowi *fl, int flags) |
741 | { | |
8ed67789 | 742 | return ip6_pol_route(net, table, fl->iif, fl, flags); |
4acad72d PE |
743 | } |
744 | ||
c71099ac TG |
745 | void ip6_route_input(struct sk_buff *skb) |
746 | { | |
0660e03f | 747 | struct ipv6hdr *iph = ipv6_hdr(skb); |
5578689a | 748 | struct net *net = skb->dev->nd_net; |
adaa70bb | 749 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
750 | struct flowi fl = { |
751 | .iif = skb->dev->ifindex, | |
752 | .nl_u = { | |
753 | .ip6_u = { | |
754 | .daddr = iph->daddr, | |
755 | .saddr = iph->saddr, | |
90bcaf7b | 756 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
757 | }, |
758 | }, | |
1ab1457c | 759 | .mark = skb->mark, |
c71099ac TG |
760 | .proto = iph->nexthdr, |
761 | }; | |
adaa70bb TG |
762 | |
763 | if (rt6_need_strict(&iph->daddr)) | |
764 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac | 765 | |
5578689a | 766 | skb->dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input); |
c71099ac TG |
767 | } |
768 | ||
8ed67789 | 769 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
c71099ac | 770 | struct flowi *fl, int flags) |
1da177e4 | 771 | { |
8ed67789 | 772 | return ip6_pol_route(net, table, fl->oif, fl, flags); |
c71099ac TG |
773 | } |
774 | ||
4591db4f DL |
775 | struct dst_entry * ip6_route_output(struct net *net, struct sock *sk, |
776 | struct flowi *fl) | |
c71099ac TG |
777 | { |
778 | int flags = 0; | |
779 | ||
780 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 781 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 782 | |
adaa70bb TG |
783 | if (!ipv6_addr_any(&fl->fl6_src)) |
784 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
785 | ||
4591db4f | 786 | return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
787 | } |
788 | ||
7159039a | 789 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 790 | |
14e50e57 DM |
791 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) |
792 | { | |
793 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
794 | struct rt6_info *rt = (struct rt6_info *) | |
795 | dst_alloc(&ip6_dst_blackhole_ops); | |
796 | struct dst_entry *new = NULL; | |
797 | ||
798 | if (rt) { | |
799 | new = &rt->u.dst; | |
800 | ||
801 | atomic_set(&new->__refcnt, 1); | |
802 | new->__use = 1; | |
352e512c HX |
803 | new->input = dst_discard; |
804 | new->output = dst_discard; | |
14e50e57 DM |
805 | |
806 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
807 | new->dev = ort->u.dst.dev; | |
808 | if (new->dev) | |
809 | dev_hold(new->dev); | |
810 | rt->rt6i_idev = ort->rt6i_idev; | |
811 | if (rt->rt6i_idev) | |
812 | in6_dev_hold(rt->rt6i_idev); | |
813 | rt->rt6i_expires = 0; | |
814 | ||
815 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
816 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
817 | rt->rt6i_metric = 0; | |
818 | ||
819 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
820 | #ifdef CONFIG_IPV6_SUBTREES | |
821 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
822 | #endif | |
823 | ||
824 | dst_free(new); | |
825 | } | |
826 | ||
827 | dst_release(*dstp); | |
828 | *dstp = new; | |
829 | return (new ? 0 : -ENOMEM); | |
830 | } | |
831 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
832 | ||
1da177e4 LT |
833 | /* |
834 | * Destination cache support functions | |
835 | */ | |
836 | ||
837 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
838 | { | |
839 | struct rt6_info *rt; | |
840 | ||
841 | rt = (struct rt6_info *) dst; | |
842 | ||
843 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
844 | return dst; | |
845 | ||
846 | return NULL; | |
847 | } | |
848 | ||
849 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
850 | { | |
851 | struct rt6_info *rt = (struct rt6_info *) dst; | |
852 | ||
853 | if (rt) { | |
854 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 855 | ip6_del_rt(rt); |
1da177e4 LT |
856 | else |
857 | dst_release(dst); | |
858 | } | |
859 | return NULL; | |
860 | } | |
861 | ||
862 | static void ip6_link_failure(struct sk_buff *skb) | |
863 | { | |
864 | struct rt6_info *rt; | |
865 | ||
866 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
867 | ||
868 | rt = (struct rt6_info *) skb->dst; | |
869 | if (rt) { | |
870 | if (rt->rt6i_flags&RTF_CACHE) { | |
871 | dst_set_expires(&rt->u.dst, 0); | |
872 | rt->rt6i_flags |= RTF_EXPIRES; | |
873 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
874 | rt->rt6i_node->fn_sernum = -1; | |
875 | } | |
876 | } | |
877 | ||
878 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
879 | { | |
880 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
881 | ||
882 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
883 | rt6->rt6i_flags |= RTF_MODIFIED; | |
884 | if (mtu < IPV6_MIN_MTU) { | |
885 | mtu = IPV6_MIN_MTU; | |
886 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
887 | } | |
888 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 889 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
890 | } |
891 | } | |
892 | ||
1da177e4 LT |
893 | static int ipv6_get_mtu(struct net_device *dev); |
894 | ||
5578689a | 895 | static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu) |
1da177e4 LT |
896 | { |
897 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
898 | ||
5578689a DL |
899 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
900 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
901 | |
902 | /* | |
1ab1457c YH |
903 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
904 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
905 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
906 | * rely only on pmtu discovery" |
907 | */ | |
908 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
909 | mtu = IPV6_MAXPLEN; | |
910 | return mtu; | |
911 | } | |
912 | ||
3b00944c YH |
913 | static struct dst_entry *icmp6_dst_gc_list; |
914 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 915 | |
3b00944c | 916 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 917 | struct neighbour *neigh, |
3b00944c | 918 | struct in6_addr *addr) |
1da177e4 LT |
919 | { |
920 | struct rt6_info *rt; | |
921 | struct inet6_dev *idev = in6_dev_get(dev); | |
5578689a | 922 | struct net *net = dev->nd_net; |
1da177e4 LT |
923 | |
924 | if (unlikely(idev == NULL)) | |
925 | return NULL; | |
926 | ||
f2fc6a54 | 927 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
928 | if (unlikely(rt == NULL)) { |
929 | in6_dev_put(idev); | |
930 | goto out; | |
931 | } | |
932 | ||
933 | dev_hold(dev); | |
934 | if (neigh) | |
935 | neigh_hold(neigh); | |
936 | else | |
937 | neigh = ndisc_get_neigh(dev, addr); | |
938 | ||
939 | rt->rt6i_dev = dev; | |
940 | rt->rt6i_idev = idev; | |
941 | rt->rt6i_nexthop = neigh; | |
942 | atomic_set(&rt->u.dst.__refcnt, 1); | |
943 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
944 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 945 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
3b00944c | 946 | rt->u.dst.output = ip6_output; |
1da177e4 LT |
947 | |
948 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
949 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
950 | ? DST_HOST | |
1da177e4 LT |
951 | : 0; |
952 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
953 | rt->rt6i_dst.plen = 128; | |
954 | #endif | |
955 | ||
3b00944c YH |
956 | spin_lock_bh(&icmp6_dst_lock); |
957 | rt->u.dst.next = icmp6_dst_gc_list; | |
958 | icmp6_dst_gc_list = &rt->u.dst; | |
959 | spin_unlock_bh(&icmp6_dst_lock); | |
1da177e4 | 960 | |
5578689a | 961 | fib6_force_start_gc(net); |
1da177e4 LT |
962 | |
963 | out: | |
40aa7b90 | 964 | return &rt->u.dst; |
1da177e4 LT |
965 | } |
966 | ||
3b00944c | 967 | int icmp6_dst_gc(int *more) |
1da177e4 LT |
968 | { |
969 | struct dst_entry *dst, *next, **pprev; | |
970 | int freed; | |
971 | ||
972 | next = NULL; | |
1ab1457c | 973 | freed = 0; |
5d0bbeeb | 974 | |
3b00944c YH |
975 | spin_lock_bh(&icmp6_dst_lock); |
976 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 977 | |
1da177e4 LT |
978 | while ((dst = *pprev) != NULL) { |
979 | if (!atomic_read(&dst->__refcnt)) { | |
980 | *pprev = dst->next; | |
981 | dst_free(dst); | |
982 | freed++; | |
983 | } else { | |
984 | pprev = &dst->next; | |
985 | (*more)++; | |
986 | } | |
987 | } | |
988 | ||
3b00944c | 989 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 990 | |
1da177e4 LT |
991 | return freed; |
992 | } | |
993 | ||
569d3645 | 994 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 995 | { |
1da177e4 | 996 | unsigned long now = jiffies; |
7019b78e DL |
997 | struct net *net = ops->dst_net; |
998 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
999 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1000 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1001 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1002 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
1003 | ||
1004 | if (time_after(rt_last_gc + rt_min_interval, now) && | |
1005 | atomic_read(&ops->entries) <= rt_max_size) | |
1da177e4 LT |
1006 | goto out; |
1007 | ||
6891a346 BT |
1008 | net->ipv6.ip6_rt_gc_expire++; |
1009 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1010 | net->ipv6.ip6_rt_last_gc = now; | |
7019b78e DL |
1011 | if (atomic_read(&ops->entries) < ops->gc_thresh) |
1012 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; | |
1da177e4 | 1013 | out: |
7019b78e DL |
1014 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
1015 | return (atomic_read(&ops->entries) > rt_max_size); | |
1da177e4 LT |
1016 | } |
1017 | ||
1018 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1019 | but results in cleaner routing tables. | |
1020 | ||
1021 | Remove it only when all the things will work! | |
1022 | */ | |
1023 | ||
1024 | static int ipv6_get_mtu(struct net_device *dev) | |
1025 | { | |
1026 | int mtu = IPV6_MIN_MTU; | |
1027 | struct inet6_dev *idev; | |
1028 | ||
1029 | idev = in6_dev_get(dev); | |
1030 | if (idev) { | |
1031 | mtu = idev->cnf.mtu6; | |
1032 | in6_dev_put(idev); | |
1033 | } | |
1034 | return mtu; | |
1035 | } | |
1036 | ||
6b75d090 | 1037 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1038 | { |
6b75d090 YH |
1039 | int hoplimit = dst_metric(dst, RTAX_HOPLIMIT); |
1040 | if (hoplimit < 0) { | |
1041 | struct net_device *dev = dst->dev; | |
1042 | struct inet6_dev *idev = in6_dev_get(dev); | |
1043 | if (idev) { | |
1044 | hoplimit = idev->cnf.hop_limit; | |
1045 | in6_dev_put(idev); | |
1046 | } else | |
1047 | hoplimit = ipv6_devconf.hop_limit; | |
1da177e4 LT |
1048 | } |
1049 | return hoplimit; | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * | |
1054 | */ | |
1055 | ||
86872cb5 | 1056 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1057 | { |
1058 | int err; | |
5578689a | 1059 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1060 | struct rt6_info *rt = NULL; |
1061 | struct net_device *dev = NULL; | |
1062 | struct inet6_dev *idev = NULL; | |
c71099ac | 1063 | struct fib6_table *table; |
1da177e4 LT |
1064 | int addr_type; |
1065 | ||
86872cb5 | 1066 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1067 | return -EINVAL; |
1068 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1069 | if (cfg->fc_src_len) |
1da177e4 LT |
1070 | return -EINVAL; |
1071 | #endif | |
86872cb5 | 1072 | if (cfg->fc_ifindex) { |
1da177e4 | 1073 | err = -ENODEV; |
5578689a | 1074 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1075 | if (!dev) |
1076 | goto out; | |
1077 | idev = in6_dev_get(dev); | |
1078 | if (!idev) | |
1079 | goto out; | |
1080 | } | |
1081 | ||
86872cb5 TG |
1082 | if (cfg->fc_metric == 0) |
1083 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1084 | |
5578689a | 1085 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1086 | if (table == NULL) { |
1087 | err = -ENOBUFS; | |
1088 | goto out; | |
1089 | } | |
1090 | ||
f2fc6a54 | 1091 | rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1092 | |
1093 | if (rt == NULL) { | |
1094 | err = -ENOMEM; | |
1095 | goto out; | |
1096 | } | |
1097 | ||
1098 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1099 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1100 | |
86872cb5 TG |
1101 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1102 | cfg->fc_protocol = RTPROT_BOOT; | |
1103 | rt->rt6i_protocol = cfg->fc_protocol; | |
1104 | ||
1105 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1106 | |
1107 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1108 | rt->u.dst.input = ip6_mc_input; | |
1109 | else | |
1110 | rt->u.dst.input = ip6_forward; | |
1111 | ||
1112 | rt->u.dst.output = ip6_output; | |
1113 | ||
86872cb5 TG |
1114 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1115 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1116 | if (rt->rt6i_dst.plen == 128) |
1117 | rt->u.dst.flags = DST_HOST; | |
1118 | ||
1119 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1120 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1121 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1122 | #endif |
1123 | ||
86872cb5 | 1124 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1125 | |
1126 | /* We cannot add true routes via loopback here, | |
1127 | they would result in kernel looping; promote them to reject routes | |
1128 | */ | |
86872cb5 | 1129 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1130 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1131 | /* hold loopback dev/idev if we haven't done so. */ | |
5578689a | 1132 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1133 | if (dev) { |
1134 | dev_put(dev); | |
1135 | in6_dev_put(idev); | |
1136 | } | |
5578689a | 1137 | dev = net->loopback_dev; |
1da177e4 LT |
1138 | dev_hold(dev); |
1139 | idev = in6_dev_get(dev); | |
1140 | if (!idev) { | |
1141 | err = -ENODEV; | |
1142 | goto out; | |
1143 | } | |
1144 | } | |
1145 | rt->u.dst.output = ip6_pkt_discard_out; | |
1146 | rt->u.dst.input = ip6_pkt_discard; | |
1147 | rt->u.dst.error = -ENETUNREACH; | |
1148 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1149 | goto install_route; | |
1150 | } | |
1151 | ||
86872cb5 | 1152 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1153 | struct in6_addr *gw_addr; |
1154 | int gwa_type; | |
1155 | ||
86872cb5 TG |
1156 | gw_addr = &cfg->fc_gateway; |
1157 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1158 | gwa_type = ipv6_addr_type(gw_addr); |
1159 | ||
1160 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1161 | struct rt6_info *grt; | |
1162 | ||
1163 | /* IPv6 strictly inhibits using not link-local | |
1164 | addresses as nexthop address. | |
1165 | Otherwise, router will not able to send redirects. | |
1166 | It is very good, but in some (rare!) circumstances | |
1167 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1168 | some exceptions. --ANK | |
1169 | */ | |
1170 | err = -EINVAL; | |
1171 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1172 | goto out; | |
1173 | ||
5578689a | 1174 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1175 | |
1176 | err = -EHOSTUNREACH; | |
1177 | if (grt == NULL) | |
1178 | goto out; | |
1179 | if (dev) { | |
1180 | if (dev != grt->rt6i_dev) { | |
1181 | dst_release(&grt->u.dst); | |
1182 | goto out; | |
1183 | } | |
1184 | } else { | |
1185 | dev = grt->rt6i_dev; | |
1186 | idev = grt->rt6i_idev; | |
1187 | dev_hold(dev); | |
1188 | in6_dev_hold(grt->rt6i_idev); | |
1189 | } | |
1190 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1191 | err = 0; | |
1192 | dst_release(&grt->u.dst); | |
1193 | ||
1194 | if (err) | |
1195 | goto out; | |
1196 | } | |
1197 | err = -EINVAL; | |
1198 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1199 | goto out; | |
1200 | } | |
1201 | ||
1202 | err = -ENODEV; | |
1203 | if (dev == NULL) | |
1204 | goto out; | |
1205 | ||
86872cb5 | 1206 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1207 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1208 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1209 | err = PTR_ERR(rt->rt6i_nexthop); | |
1210 | rt->rt6i_nexthop = NULL; | |
1211 | goto out; | |
1212 | } | |
1213 | } | |
1214 | ||
86872cb5 | 1215 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1216 | |
1217 | install_route: | |
86872cb5 TG |
1218 | if (cfg->fc_mx) { |
1219 | struct nlattr *nla; | |
1220 | int remaining; | |
1221 | ||
1222 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1223 | int type = nla_type(nla); |
86872cb5 TG |
1224 | |
1225 | if (type) { | |
1226 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1227 | err = -EINVAL; |
1228 | goto out; | |
1229 | } | |
86872cb5 TG |
1230 | |
1231 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1232 | } |
1da177e4 LT |
1233 | } |
1234 | } | |
1235 | ||
1236 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1237 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1238 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1239 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1240 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
5578689a | 1241 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1242 | rt->u.dst.dev = dev; |
1243 | rt->rt6i_idev = idev; | |
c71099ac | 1244 | rt->rt6i_table = table; |
63152fc0 DL |
1245 | |
1246 | cfg->fc_nlinfo.nl_net = dev->nd_net; | |
1247 | ||
86872cb5 | 1248 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1249 | |
1250 | out: | |
1251 | if (dev) | |
1252 | dev_put(dev); | |
1253 | if (idev) | |
1254 | in6_dev_put(idev); | |
1255 | if (rt) | |
40aa7b90 | 1256 | dst_free(&rt->u.dst); |
1da177e4 LT |
1257 | return err; |
1258 | } | |
1259 | ||
86872cb5 | 1260 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1261 | { |
1262 | int err; | |
c71099ac | 1263 | struct fib6_table *table; |
8ed67789 | 1264 | struct net *net = rt->rt6i_dev->nd_net; |
1da177e4 | 1265 | |
8ed67789 | 1266 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1267 | return -ENOENT; |
1268 | ||
c71099ac TG |
1269 | table = rt->rt6i_table; |
1270 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1271 | |
86872cb5 | 1272 | err = fib6_del(rt, info); |
1da177e4 LT |
1273 | dst_release(&rt->u.dst); |
1274 | ||
c71099ac | 1275 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1276 | |
1277 | return err; | |
1278 | } | |
1279 | ||
e0a1ad73 TG |
1280 | int ip6_del_rt(struct rt6_info *rt) |
1281 | { | |
4d1169c1 | 1282 | struct nl_info info = { |
5578689a | 1283 | .nl_net = rt->rt6i_dev->nd_net, |
4d1169c1 | 1284 | }; |
528c4ceb | 1285 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1286 | } |
1287 | ||
86872cb5 | 1288 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1289 | { |
c71099ac | 1290 | struct fib6_table *table; |
1da177e4 LT |
1291 | struct fib6_node *fn; |
1292 | struct rt6_info *rt; | |
1293 | int err = -ESRCH; | |
1294 | ||
5578689a | 1295 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1296 | if (table == NULL) |
1297 | return err; | |
1298 | ||
1299 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1300 | |
c71099ac | 1301 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1302 | &cfg->fc_dst, cfg->fc_dst_len, |
1303 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1304 | |
1da177e4 | 1305 | if (fn) { |
7cc48263 | 1306 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1307 | if (cfg->fc_ifindex && |
1da177e4 | 1308 | (rt->rt6i_dev == NULL || |
86872cb5 | 1309 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1310 | continue; |
86872cb5 TG |
1311 | if (cfg->fc_flags & RTF_GATEWAY && |
1312 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1313 | continue; |
86872cb5 | 1314 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1315 | continue; |
1316 | dst_hold(&rt->u.dst); | |
c71099ac | 1317 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1318 | |
86872cb5 | 1319 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1320 | } |
1321 | } | |
c71099ac | 1322 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1323 | |
1324 | return err; | |
1325 | } | |
1326 | ||
1327 | /* | |
1328 | * Handle redirects | |
1329 | */ | |
a6279458 YH |
1330 | struct ip6rd_flowi { |
1331 | struct flowi fl; | |
1332 | struct in6_addr gateway; | |
1333 | }; | |
1334 | ||
8ed67789 DL |
1335 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1336 | struct fib6_table *table, | |
a6279458 YH |
1337 | struct flowi *fl, |
1338 | int flags) | |
1da177e4 | 1339 | { |
a6279458 YH |
1340 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1341 | struct rt6_info *rt; | |
e843b9e1 | 1342 | struct fib6_node *fn; |
c71099ac | 1343 | |
1da177e4 | 1344 | /* |
e843b9e1 YH |
1345 | * Get the "current" route for this destination and |
1346 | * check if the redirect has come from approriate router. | |
1347 | * | |
1348 | * RFC 2461 specifies that redirects should only be | |
1349 | * accepted if they come from the nexthop to the target. | |
1350 | * Due to the way the routes are chosen, this notion | |
1351 | * is a bit fuzzy and one might need to check all possible | |
1352 | * routes. | |
1da177e4 | 1353 | */ |
1da177e4 | 1354 | |
c71099ac | 1355 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1356 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1357 | restart: |
7cc48263 | 1358 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1359 | /* |
1360 | * Current route is on-link; redirect is always invalid. | |
1361 | * | |
1362 | * Seems, previous statement is not true. It could | |
1363 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1364 | * But then router serving it might decide, that we should | |
1365 | * know truth 8)8) --ANK (980726). | |
1366 | */ | |
1367 | if (rt6_check_expired(rt)) | |
1368 | continue; | |
1369 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1370 | continue; | |
a6279458 | 1371 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1372 | continue; |
a6279458 | 1373 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1374 | continue; |
1375 | break; | |
1376 | } | |
a6279458 | 1377 | |
cb15d9c2 | 1378 | if (!rt) |
8ed67789 DL |
1379 | rt = net->ipv6.ip6_null_entry; |
1380 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1381 | out: |
a6279458 YH |
1382 | dst_hold(&rt->u.dst); |
1383 | ||
c71099ac | 1384 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1385 | |
a6279458 YH |
1386 | return rt; |
1387 | }; | |
1388 | ||
1389 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1390 | struct in6_addr *src, | |
1391 | struct in6_addr *gateway, | |
1392 | struct net_device *dev) | |
1393 | { | |
adaa70bb | 1394 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
5578689a | 1395 | struct net *net = dev->nd_net; |
a6279458 YH |
1396 | struct ip6rd_flowi rdfl = { |
1397 | .fl = { | |
1398 | .oif = dev->ifindex, | |
1399 | .nl_u = { | |
1400 | .ip6_u = { | |
1401 | .daddr = *dest, | |
1402 | .saddr = *src, | |
1403 | }, | |
1404 | }, | |
1405 | }, | |
1406 | .gateway = *gateway, | |
1407 | }; | |
adaa70bb TG |
1408 | |
1409 | if (rt6_need_strict(dest)) | |
1410 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1411 | |
5578689a | 1412 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1413 | flags, __ip6_route_redirect); |
a6279458 YH |
1414 | } |
1415 | ||
1416 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1417 | struct in6_addr *saddr, | |
1418 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1419 | { | |
1420 | struct rt6_info *rt, *nrt = NULL; | |
1421 | struct netevent_redirect netevent; | |
8ed67789 | 1422 | struct net *net = neigh->dev->nd_net; |
a6279458 YH |
1423 | |
1424 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1425 | ||
8ed67789 | 1426 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1427 | if (net_ratelimit()) |
1428 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1429 | "for redirect target\n"); | |
a6279458 | 1430 | goto out; |
1da177e4 LT |
1431 | } |
1432 | ||
1da177e4 LT |
1433 | /* |
1434 | * We have finally decided to accept it. | |
1435 | */ | |
1436 | ||
1ab1457c | 1437 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1438 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1439 | NEIGH_UPDATE_F_OVERRIDE| | |
1440 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1441 | NEIGH_UPDATE_F_ISROUTER)) | |
1442 | ); | |
1443 | ||
1444 | /* | |
1445 | * Redirect received -> path was valid. | |
1446 | * Look, redirects are sent only in response to data packets, | |
1447 | * so that this nexthop apparently is reachable. --ANK | |
1448 | */ | |
1449 | dst_confirm(&rt->u.dst); | |
1450 | ||
1451 | /* Duplicate redirect: silently ignore. */ | |
1452 | if (neigh == rt->u.dst.neighbour) | |
1453 | goto out; | |
1454 | ||
1455 | nrt = ip6_rt_copy(rt); | |
1456 | if (nrt == NULL) | |
1457 | goto out; | |
1458 | ||
1459 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1460 | if (on_link) | |
1461 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1462 | ||
1463 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1464 | nrt->rt6i_dst.plen = 128; | |
1465 | nrt->u.dst.flags |= DST_HOST; | |
1466 | ||
1467 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1468 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1469 | /* Reset pmtu, it may be better */ | |
1470 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
5578689a DL |
1471 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(neigh->dev->nd_net, |
1472 | dst_mtu(&nrt->u.dst)); | |
1da177e4 | 1473 | |
40e22e8f | 1474 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1475 | goto out; |
1476 | ||
8d71740c TT |
1477 | netevent.old = &rt->u.dst; |
1478 | netevent.new = &nrt->u.dst; | |
1479 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1480 | ||
1da177e4 | 1481 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1482 | ip6_del_rt(rt); |
1da177e4 LT |
1483 | return; |
1484 | } | |
1485 | ||
1486 | out: | |
1ab1457c | 1487 | dst_release(&rt->u.dst); |
1da177e4 LT |
1488 | return; |
1489 | } | |
1490 | ||
1491 | /* | |
1492 | * Handle ICMP "packet too big" messages | |
1493 | * i.e. Path MTU discovery | |
1494 | */ | |
1495 | ||
1496 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1497 | struct net_device *dev, u32 pmtu) | |
1498 | { | |
1499 | struct rt6_info *rt, *nrt; | |
5578689a | 1500 | struct net *net = dev->nd_net; |
1da177e4 LT |
1501 | int allfrag = 0; |
1502 | ||
5578689a | 1503 | rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0); |
1da177e4 LT |
1504 | if (rt == NULL) |
1505 | return; | |
1506 | ||
1507 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1508 | goto out; | |
1509 | ||
1510 | if (pmtu < IPV6_MIN_MTU) { | |
1511 | /* | |
1ab1457c | 1512 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1513 | * MTU (1280) and a fragment header should always be included |
1514 | * after a node receiving Too Big message reporting PMTU is | |
1515 | * less than the IPv6 Minimum Link MTU. | |
1516 | */ | |
1517 | pmtu = IPV6_MIN_MTU; | |
1518 | allfrag = 1; | |
1519 | } | |
1520 | ||
1521 | /* New mtu received -> path was valid. | |
1522 | They are sent only in response to data packets, | |
1523 | so that this nexthop apparently is reachable. --ANK | |
1524 | */ | |
1525 | dst_confirm(&rt->u.dst); | |
1526 | ||
1527 | /* Host route. If it is static, it would be better | |
1528 | not to override it, but add new one, so that | |
1529 | when cache entry will expire old pmtu | |
1530 | would return automatically. | |
1531 | */ | |
1532 | if (rt->rt6i_flags & RTF_CACHE) { | |
1533 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1534 | if (allfrag) | |
1535 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
5578689a | 1536 | dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1537 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1538 | goto out; | |
1539 | } | |
1540 | ||
1541 | /* Network route. | |
1542 | Two cases are possible: | |
1543 | 1. It is connected route. Action: COW | |
1544 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1545 | */ | |
d5315b50 | 1546 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1547 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1548 | else |
1549 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1550 | |
d5315b50 | 1551 | if (nrt) { |
a1e78363 YH |
1552 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1553 | if (allfrag) | |
1554 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1555 | ||
1556 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1557 | * happened within 5 mins, the recommended timer is 10 mins. | |
1558 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1559 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1560 | * and detecting PMTU increase will be automatically happened. | |
1561 | */ | |
5578689a | 1562 | dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1563 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1564 | ||
40e22e8f | 1565 | ip6_ins_rt(nrt); |
1da177e4 | 1566 | } |
1da177e4 LT |
1567 | out: |
1568 | dst_release(&rt->u.dst); | |
1569 | } | |
1570 | ||
1571 | /* | |
1572 | * Misc support functions | |
1573 | */ | |
1574 | ||
1575 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1576 | { | |
f2fc6a54 BT |
1577 | struct net *net = ort->rt6i_dev->nd_net; |
1578 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); | |
1da177e4 LT |
1579 | |
1580 | if (rt) { | |
1581 | rt->u.dst.input = ort->u.dst.input; | |
1582 | rt->u.dst.output = ort->u.dst.output; | |
1583 | ||
1584 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1585 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1586 | rt->u.dst.dev = ort->u.dst.dev; |
1587 | if (rt->u.dst.dev) | |
1588 | dev_hold(rt->u.dst.dev); | |
1589 | rt->rt6i_idev = ort->rt6i_idev; | |
1590 | if (rt->rt6i_idev) | |
1591 | in6_dev_hold(rt->rt6i_idev); | |
1592 | rt->u.dst.lastuse = jiffies; | |
1593 | rt->rt6i_expires = 0; | |
1594 | ||
1595 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1596 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1597 | rt->rt6i_metric = 0; | |
1598 | ||
1599 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1600 | #ifdef CONFIG_IPV6_SUBTREES | |
1601 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1602 | #endif | |
c71099ac | 1603 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1604 | } |
1605 | return rt; | |
1606 | } | |
1607 | ||
70ceb4f5 | 1608 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1609 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1610 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1611 | struct in6_addr *gwaddr, int ifindex) |
1612 | { | |
1613 | struct fib6_node *fn; | |
1614 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1615 | struct fib6_table *table; |
1616 | ||
efa2cea0 | 1617 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1618 | if (table == NULL) |
1619 | return NULL; | |
70ceb4f5 | 1620 | |
c71099ac TG |
1621 | write_lock_bh(&table->tb6_lock); |
1622 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1623 | if (!fn) |
1624 | goto out; | |
1625 | ||
7cc48263 | 1626 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1627 | if (rt->rt6i_dev->ifindex != ifindex) |
1628 | continue; | |
1629 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1630 | continue; | |
1631 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1632 | continue; | |
1633 | dst_hold(&rt->u.dst); | |
1634 | break; | |
1635 | } | |
1636 | out: | |
c71099ac | 1637 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1638 | return rt; |
1639 | } | |
1640 | ||
efa2cea0 DL |
1641 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1642 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1643 | struct in6_addr *gwaddr, int ifindex, |
1644 | unsigned pref) | |
1645 | { | |
86872cb5 TG |
1646 | struct fib6_config cfg = { |
1647 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1648 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1649 | .fc_ifindex = ifindex, |
1650 | .fc_dst_len = prefixlen, | |
1651 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1652 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1653 | .fc_nlinfo.pid = 0, |
1654 | .fc_nlinfo.nlh = NULL, | |
1655 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1656 | }; |
1657 | ||
1658 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1659 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1660 | |
e317da96 YH |
1661 | /* We should treat it as a default route if prefix length is 0. */ |
1662 | if (!prefixlen) | |
86872cb5 | 1663 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1664 | |
86872cb5 | 1665 | ip6_route_add(&cfg); |
70ceb4f5 | 1666 | |
efa2cea0 | 1667 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1668 | } |
1669 | #endif | |
1670 | ||
1da177e4 | 1671 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1672 | { |
1da177e4 | 1673 | struct rt6_info *rt; |
c71099ac | 1674 | struct fib6_table *table; |
1da177e4 | 1675 | |
5578689a | 1676 | table = fib6_get_table(dev->nd_net, RT6_TABLE_DFLT); |
c71099ac TG |
1677 | if (table == NULL) |
1678 | return NULL; | |
1da177e4 | 1679 | |
c71099ac | 1680 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1681 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1682 | if (dev == rt->rt6i_dev && |
045927ff | 1683 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1684 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1685 | break; | |
1686 | } | |
1687 | if (rt) | |
1688 | dst_hold(&rt->u.dst); | |
c71099ac | 1689 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1690 | return rt; |
1691 | } | |
1692 | ||
c7dc89c0 FT |
1693 | EXPORT_SYMBOL(rt6_get_dflt_router); |
1694 | ||
1da177e4 | 1695 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, |
ebacaaa0 YH |
1696 | struct net_device *dev, |
1697 | unsigned int pref) | |
1da177e4 | 1698 | { |
86872cb5 TG |
1699 | struct fib6_config cfg = { |
1700 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1701 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1702 | .fc_ifindex = dev->ifindex, |
1703 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1704 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1705 | .fc_nlinfo.pid = 0, |
1706 | .fc_nlinfo.nlh = NULL, | |
1707 | .fc_nlinfo.nl_net = dev->nd_net, | |
86872cb5 | 1708 | }; |
1da177e4 | 1709 | |
86872cb5 | 1710 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1711 | |
86872cb5 | 1712 | ip6_route_add(&cfg); |
1da177e4 | 1713 | |
1da177e4 LT |
1714 | return rt6_get_dflt_router(gwaddr, dev); |
1715 | } | |
1716 | ||
7b4da532 | 1717 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1718 | { |
1719 | struct rt6_info *rt; | |
c71099ac TG |
1720 | struct fib6_table *table; |
1721 | ||
1722 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1723 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1724 | if (table == NULL) |
1725 | return; | |
1da177e4 LT |
1726 | |
1727 | restart: | |
c71099ac | 1728 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1729 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1730 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1731 | dst_hold(&rt->u.dst); | |
c71099ac | 1732 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1733 | ip6_del_rt(rt); |
1da177e4 LT |
1734 | goto restart; |
1735 | } | |
1736 | } | |
c71099ac | 1737 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1738 | } |
1739 | ||
5578689a DL |
1740 | static void rtmsg_to_fib6_config(struct net *net, |
1741 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1742 | struct fib6_config *cfg) |
1743 | { | |
1744 | memset(cfg, 0, sizeof(*cfg)); | |
1745 | ||
1746 | cfg->fc_table = RT6_TABLE_MAIN; | |
1747 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1748 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1749 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1750 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1751 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1752 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1753 | ||
5578689a | 1754 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1755 | |
86872cb5 TG |
1756 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1757 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1758 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1759 | } | |
1760 | ||
5578689a | 1761 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1762 | { |
86872cb5 | 1763 | struct fib6_config cfg; |
1da177e4 LT |
1764 | struct in6_rtmsg rtmsg; |
1765 | int err; | |
1766 | ||
1767 | switch(cmd) { | |
1768 | case SIOCADDRT: /* Add a route */ | |
1769 | case SIOCDELRT: /* Delete a route */ | |
1770 | if (!capable(CAP_NET_ADMIN)) | |
1771 | return -EPERM; | |
1772 | err = copy_from_user(&rtmsg, arg, | |
1773 | sizeof(struct in6_rtmsg)); | |
1774 | if (err) | |
1775 | return -EFAULT; | |
86872cb5 | 1776 | |
5578689a | 1777 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1778 | |
1da177e4 LT |
1779 | rtnl_lock(); |
1780 | switch (cmd) { | |
1781 | case SIOCADDRT: | |
86872cb5 | 1782 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1783 | break; |
1784 | case SIOCDELRT: | |
86872cb5 | 1785 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1786 | break; |
1787 | default: | |
1788 | err = -EINVAL; | |
1789 | } | |
1790 | rtnl_unlock(); | |
1791 | ||
1792 | return err; | |
3ff50b79 | 1793 | } |
1da177e4 LT |
1794 | |
1795 | return -EINVAL; | |
1796 | } | |
1797 | ||
1798 | /* | |
1799 | * Drop the packet on the floor | |
1800 | */ | |
1801 | ||
50eb431d | 1802 | static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes) |
1da177e4 | 1803 | { |
612f09e8 YH |
1804 | int type; |
1805 | switch (ipstats_mib_noroutes) { | |
1806 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1807 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 YH |
1808 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
1809 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1810 | break; | |
1811 | } | |
1812 | /* FALLTHROUGH */ | |
1813 | case IPSTATS_MIB_OUTNOROUTES: | |
1814 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1815 | break; | |
1816 | } | |
9ce8ade0 | 1817 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1818 | kfree_skb(skb); |
1819 | return 0; | |
1820 | } | |
1821 | ||
9ce8ade0 TG |
1822 | static int ip6_pkt_discard(struct sk_buff *skb) |
1823 | { | |
612f09e8 | 1824 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1825 | } |
1826 | ||
20380731 | 1827 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1828 | { |
1829 | skb->dev = skb->dst->dev; | |
612f09e8 | 1830 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1831 | } |
1832 | ||
6723ab54 DM |
1833 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1834 | ||
9ce8ade0 TG |
1835 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1836 | { | |
612f09e8 | 1837 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1838 | } |
1839 | ||
1840 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1841 | { | |
1842 | skb->dev = skb->dst->dev; | |
612f09e8 | 1843 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1844 | } |
1845 | ||
6723ab54 DM |
1846 | #endif |
1847 | ||
1da177e4 LT |
1848 | /* |
1849 | * Allocate a dst for local (unicast / anycast) address. | |
1850 | */ | |
1851 | ||
1852 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1853 | const struct in6_addr *addr, | |
1854 | int anycast) | |
1855 | { | |
5578689a | 1856 | struct net *net = idev->dev->nd_net; |
f2fc6a54 | 1857 | struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1858 | |
1859 | if (rt == NULL) | |
1860 | return ERR_PTR(-ENOMEM); | |
1861 | ||
5578689a | 1862 | dev_hold(net->loopback_dev); |
1da177e4 LT |
1863 | in6_dev_hold(idev); |
1864 | ||
1865 | rt->u.dst.flags = DST_HOST; | |
1866 | rt->u.dst.input = ip6_input; | |
1867 | rt->u.dst.output = ip6_output; | |
5578689a | 1868 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 LT |
1869 | rt->rt6i_idev = idev; |
1870 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
5578689a | 1871 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst)); |
1da177e4 LT |
1872 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
1873 | rt->u.dst.obsolete = -1; | |
1874 | ||
1875 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1876 | if (anycast) |
1877 | rt->rt6i_flags |= RTF_ANYCAST; | |
1878 | else | |
1da177e4 LT |
1879 | rt->rt6i_flags |= RTF_LOCAL; |
1880 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1881 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1882 | dst_free(&rt->u.dst); |
1da177e4 LT |
1883 | return ERR_PTR(-ENOMEM); |
1884 | } | |
1885 | ||
1886 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1887 | rt->rt6i_dst.plen = 128; | |
5578689a | 1888 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 LT |
1889 | |
1890 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1891 | ||
1892 | return rt; | |
1893 | } | |
1894 | ||
8ed67789 DL |
1895 | struct arg_dev_net { |
1896 | struct net_device *dev; | |
1897 | struct net *net; | |
1898 | }; | |
1899 | ||
1da177e4 LT |
1900 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
1901 | { | |
8ed67789 DL |
1902 | struct net_device *dev = ((struct arg_dev_net *)arg)->dev; |
1903 | struct net *net = ((struct arg_dev_net *)arg)->net; | |
1904 | ||
1905 | if (((void *)rt->rt6i_dev == dev || dev == NULL) && | |
1906 | rt != net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
1907 | RT6_TRACE("deleted by ifdown %p\n", rt); |
1908 | return -1; | |
1909 | } | |
1910 | return 0; | |
1911 | } | |
1912 | ||
f3db4851 | 1913 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 1914 | { |
8ed67789 DL |
1915 | struct arg_dev_net adn = { |
1916 | .dev = dev, | |
1917 | .net = net, | |
1918 | }; | |
1919 | ||
1920 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1da177e4 LT |
1921 | } |
1922 | ||
1923 | struct rt6_mtu_change_arg | |
1924 | { | |
1925 | struct net_device *dev; | |
1926 | unsigned mtu; | |
1927 | }; | |
1928 | ||
1929 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1930 | { | |
1931 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1932 | struct inet6_dev *idev; | |
5578689a | 1933 | struct net *net = arg->dev->nd_net; |
1da177e4 LT |
1934 | |
1935 | /* In IPv6 pmtu discovery is not optional, | |
1936 | so that RTAX_MTU lock cannot disable it. | |
1937 | We still use this lock to block changes | |
1938 | caused by addrconf/ndisc. | |
1939 | */ | |
1940 | ||
1941 | idev = __in6_dev_get(arg->dev); | |
1942 | if (idev == NULL) | |
1943 | return 0; | |
1944 | ||
1945 | /* For administrative MTU increase, there is no way to discover | |
1946 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1947 | Since RFC 1981 doesn't include administrative MTU increase | |
1948 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1949 | */ | |
1950 | /* | |
1951 | If new MTU is less than route PMTU, this new MTU will be the | |
1952 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1953 | decreases; if new MTU is greater than route PMTU, and the | |
1954 | old MTU is the lowest MTU in the path, update the route PMTU | |
1955 | to reflect the increase. In this case if the other nodes' MTU | |
1956 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1957 | PMTU discouvery. | |
1958 | */ | |
1959 | if (rt->rt6i_dev == arg->dev && | |
1960 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
23717795 | 1961 | (dst_mtu(&rt->u.dst) >= arg->mtu || |
1ab1457c | 1962 | (dst_mtu(&rt->u.dst) < arg->mtu && |
566cfd8f | 1963 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { |
1da177e4 | 1964 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
5578689a | 1965 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu); |
566cfd8f | 1966 | } |
1da177e4 LT |
1967 | return 0; |
1968 | } | |
1969 | ||
1970 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1971 | { | |
c71099ac TG |
1972 | struct rt6_mtu_change_arg arg = { |
1973 | .dev = dev, | |
1974 | .mtu = mtu, | |
1975 | }; | |
1da177e4 | 1976 | |
f3db4851 | 1977 | fib6_clean_all(dev->nd_net, rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1978 | } |
1979 | ||
ef7c79ed | 1980 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 1981 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1982 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1983 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1984 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1985 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1986 | }; | |
1987 | ||
1988 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1989 | struct fib6_config *cfg) | |
1da177e4 | 1990 | { |
86872cb5 TG |
1991 | struct rtmsg *rtm; |
1992 | struct nlattr *tb[RTA_MAX+1]; | |
1993 | int err; | |
1da177e4 | 1994 | |
86872cb5 TG |
1995 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1996 | if (err < 0) | |
1997 | goto errout; | |
1da177e4 | 1998 | |
86872cb5 TG |
1999 | err = -EINVAL; |
2000 | rtm = nlmsg_data(nlh); | |
2001 | memset(cfg, 0, sizeof(*cfg)); | |
2002 | ||
2003 | cfg->fc_table = rtm->rtm_table; | |
2004 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2005 | cfg->fc_src_len = rtm->rtm_src_len; | |
2006 | cfg->fc_flags = RTF_UP; | |
2007 | cfg->fc_protocol = rtm->rtm_protocol; | |
2008 | ||
2009 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2010 | cfg->fc_flags |= RTF_REJECT; | |
2011 | ||
2012 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
2013 | cfg->fc_nlinfo.nlh = nlh; | |
2216b483 | 2014 | cfg->fc_nlinfo.nl_net = skb->sk->sk_net; |
86872cb5 TG |
2015 | |
2016 | if (tb[RTA_GATEWAY]) { | |
2017 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2018 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2019 | } |
86872cb5 TG |
2020 | |
2021 | if (tb[RTA_DST]) { | |
2022 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2023 | ||
2024 | if (nla_len(tb[RTA_DST]) < plen) | |
2025 | goto errout; | |
2026 | ||
2027 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2028 | } |
86872cb5 TG |
2029 | |
2030 | if (tb[RTA_SRC]) { | |
2031 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2032 | ||
2033 | if (nla_len(tb[RTA_SRC]) < plen) | |
2034 | goto errout; | |
2035 | ||
2036 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2037 | } |
86872cb5 TG |
2038 | |
2039 | if (tb[RTA_OIF]) | |
2040 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2041 | ||
2042 | if (tb[RTA_PRIORITY]) | |
2043 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2044 | ||
2045 | if (tb[RTA_METRICS]) { | |
2046 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2047 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2048 | } |
86872cb5 TG |
2049 | |
2050 | if (tb[RTA_TABLE]) | |
2051 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2052 | ||
2053 | err = 0; | |
2054 | errout: | |
2055 | return err; | |
1da177e4 LT |
2056 | } |
2057 | ||
c127ea2c | 2058 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2059 | { |
86872cb5 TG |
2060 | struct fib6_config cfg; |
2061 | int err; | |
1da177e4 | 2062 | |
86872cb5 TG |
2063 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2064 | if (err < 0) | |
2065 | return err; | |
2066 | ||
2067 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2068 | } |
2069 | ||
c127ea2c | 2070 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2071 | { |
86872cb5 TG |
2072 | struct fib6_config cfg; |
2073 | int err; | |
1da177e4 | 2074 | |
86872cb5 TG |
2075 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2076 | if (err < 0) | |
2077 | return err; | |
2078 | ||
2079 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2080 | } |
2081 | ||
339bf98f TG |
2082 | static inline size_t rt6_nlmsg_size(void) |
2083 | { | |
2084 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2085 | + nla_total_size(16) /* RTA_SRC */ | |
2086 | + nla_total_size(16) /* RTA_DST */ | |
2087 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2088 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2089 | + nla_total_size(4) /* RTA_TABLE */ | |
2090 | + nla_total_size(4) /* RTA_IIF */ | |
2091 | + nla_total_size(4) /* RTA_OIF */ | |
2092 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2093 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2094 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2095 | } | |
2096 | ||
1da177e4 | 2097 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2098 | struct in6_addr *dst, struct in6_addr *src, |
2099 | int iif, int type, u32 pid, u32 seq, | |
2100 | int prefix, unsigned int flags) | |
1da177e4 LT |
2101 | { |
2102 | struct rtmsg *rtm; | |
2d7202bf | 2103 | struct nlmsghdr *nlh; |
e3703b3d | 2104 | long expires; |
9e762a4a | 2105 | u32 table; |
1da177e4 LT |
2106 | |
2107 | if (prefix) { /* user wants prefix routes only */ | |
2108 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2109 | /* success since this is not a prefix route */ | |
2110 | return 1; | |
2111 | } | |
2112 | } | |
2113 | ||
2d7202bf TG |
2114 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2115 | if (nlh == NULL) | |
26932566 | 2116 | return -EMSGSIZE; |
2d7202bf TG |
2117 | |
2118 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2119 | rtm->rtm_family = AF_INET6; |
2120 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2121 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2122 | rtm->rtm_tos = 0; | |
c71099ac | 2123 | if (rt->rt6i_table) |
9e762a4a | 2124 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2125 | else |
9e762a4a PM |
2126 | table = RT6_TABLE_UNSPEC; |
2127 | rtm->rtm_table = table; | |
2d7202bf | 2128 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2129 | if (rt->rt6i_flags&RTF_REJECT) |
2130 | rtm->rtm_type = RTN_UNREACHABLE; | |
2131 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2132 | rtm->rtm_type = RTN_LOCAL; | |
2133 | else | |
2134 | rtm->rtm_type = RTN_UNICAST; | |
2135 | rtm->rtm_flags = 0; | |
2136 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2137 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2138 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2139 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2140 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2141 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2142 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2143 | rtm->rtm_protocol = RTPROT_RA; | |
2144 | ||
2145 | if (rt->rt6i_flags&RTF_CACHE) | |
2146 | rtm->rtm_flags |= RTM_F_CLONED; | |
2147 | ||
2148 | if (dst) { | |
2d7202bf | 2149 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2150 | rtm->rtm_dst_len = 128; |
1da177e4 | 2151 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2152 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2153 | #ifdef CONFIG_IPV6_SUBTREES |
2154 | if (src) { | |
2d7202bf | 2155 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2156 | rtm->rtm_src_len = 128; |
1da177e4 | 2157 | } else if (rtm->rtm_src_len) |
2d7202bf | 2158 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2159 | #endif |
2160 | if (iif) | |
2d7202bf | 2161 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2162 | else if (dst) { |
2163 | struct in6_addr saddr_buf; | |
5e5f3f0f YH |
2164 | if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev, |
2165 | dst, &saddr_buf) == 0) | |
2d7202bf | 2166 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2167 | } |
2d7202bf | 2168 | |
1da177e4 | 2169 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2170 | goto nla_put_failure; |
2171 | ||
1da177e4 | 2172 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2173 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2174 | ||
1da177e4 | 2175 | if (rt->u.dst.dev) |
2d7202bf TG |
2176 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2177 | ||
2178 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2179 | |
2180 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2181 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2182 | expires, rt->u.dst.error) < 0) | |
2183 | goto nla_put_failure; | |
2d7202bf TG |
2184 | |
2185 | return nlmsg_end(skb, nlh); | |
2186 | ||
2187 | nla_put_failure: | |
26932566 PM |
2188 | nlmsg_cancel(skb, nlh); |
2189 | return -EMSGSIZE; | |
1da177e4 LT |
2190 | } |
2191 | ||
1b43af54 | 2192 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2193 | { |
2194 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2195 | int prefix; | |
2196 | ||
2d7202bf TG |
2197 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2198 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2199 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2200 | } else | |
2201 | prefix = 0; | |
2202 | ||
2203 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2204 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2205 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2206 | } |
2207 | ||
c127ea2c | 2208 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2209 | { |
b854272b | 2210 | struct net *net = in_skb->sk->sk_net; |
ab364a6f TG |
2211 | struct nlattr *tb[RTA_MAX+1]; |
2212 | struct rt6_info *rt; | |
1da177e4 | 2213 | struct sk_buff *skb; |
ab364a6f | 2214 | struct rtmsg *rtm; |
1da177e4 | 2215 | struct flowi fl; |
ab364a6f | 2216 | int err, iif = 0; |
1da177e4 | 2217 | |
ab364a6f TG |
2218 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2219 | if (err < 0) | |
2220 | goto errout; | |
1da177e4 | 2221 | |
ab364a6f | 2222 | err = -EINVAL; |
1da177e4 | 2223 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2224 | |
ab364a6f TG |
2225 | if (tb[RTA_SRC]) { |
2226 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2227 | goto errout; | |
2228 | ||
2229 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2230 | } | |
2231 | ||
2232 | if (tb[RTA_DST]) { | |
2233 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2234 | goto errout; | |
2235 | ||
2236 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2237 | } | |
2238 | ||
2239 | if (tb[RTA_IIF]) | |
2240 | iif = nla_get_u32(tb[RTA_IIF]); | |
2241 | ||
2242 | if (tb[RTA_OIF]) | |
2243 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2244 | |
2245 | if (iif) { | |
2246 | struct net_device *dev; | |
5578689a | 2247 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2248 | if (!dev) { |
2249 | err = -ENODEV; | |
ab364a6f | 2250 | goto errout; |
1da177e4 LT |
2251 | } |
2252 | } | |
2253 | ||
ab364a6f TG |
2254 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2255 | if (skb == NULL) { | |
2256 | err = -ENOBUFS; | |
2257 | goto errout; | |
2258 | } | |
1da177e4 | 2259 | |
ab364a6f TG |
2260 | /* Reserve room for dummy headers, this skb can pass |
2261 | through good chunk of routing engine. | |
2262 | */ | |
459a98ed | 2263 | skb_reset_mac_header(skb); |
ab364a6f | 2264 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2265 | |
8a3edd80 | 2266 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl); |
1da177e4 LT |
2267 | skb->dst = &rt->u.dst; |
2268 | ||
ab364a6f | 2269 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2270 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2271 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2272 | if (err < 0) { |
ab364a6f TG |
2273 | kfree_skb(skb); |
2274 | goto errout; | |
1da177e4 LT |
2275 | } |
2276 | ||
5578689a | 2277 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2278 | errout: |
1da177e4 | 2279 | return err; |
1da177e4 LT |
2280 | } |
2281 | ||
86872cb5 | 2282 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2283 | { |
2284 | struct sk_buff *skb; | |
5578689a | 2285 | struct net *net = info->nl_net; |
528c4ceb DL |
2286 | u32 seq; |
2287 | int err; | |
2288 | ||
2289 | err = -ENOBUFS; | |
2290 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2291 | |
339bf98f | 2292 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2293 | if (skb == NULL) |
2294 | goto errout; | |
2295 | ||
528c4ceb DL |
2296 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, |
2297 | event, info->pid, seq, 0, 0); | |
26932566 PM |
2298 | if (err < 0) { |
2299 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2300 | WARN_ON(err == -EMSGSIZE); | |
2301 | kfree_skb(skb); | |
2302 | goto errout; | |
2303 | } | |
5578689a DL |
2304 | err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2305 | info->nlh, gfp_any()); | |
21713ebc TG |
2306 | errout: |
2307 | if (err < 0) | |
5578689a | 2308 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2309 | } |
2310 | ||
8ed67789 DL |
2311 | static int ip6_route_dev_notify(struct notifier_block *this, |
2312 | unsigned long event, void *data) | |
2313 | { | |
2314 | struct net_device *dev = (struct net_device *)data; | |
2315 | struct net *net = dev->nd_net; | |
2316 | ||
2317 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
2318 | net->ipv6.ip6_null_entry->u.dst.dev = dev; | |
2319 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); | |
2320 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2321 | net->ipv6.ip6_prohibit_entry->u.dst.dev = dev; | |
2322 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); | |
2323 | net->ipv6.ip6_blk_hole_entry->u.dst.dev = dev; | |
2324 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); | |
2325 | #endif | |
2326 | } | |
2327 | ||
2328 | return NOTIFY_OK; | |
2329 | } | |
2330 | ||
1da177e4 LT |
2331 | /* |
2332 | * /proc | |
2333 | */ | |
2334 | ||
2335 | #ifdef CONFIG_PROC_FS | |
2336 | ||
2337 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2338 | ||
2339 | struct rt6_proc_arg | |
2340 | { | |
2341 | char *buffer; | |
2342 | int offset; | |
2343 | int length; | |
2344 | int skip; | |
2345 | int len; | |
2346 | }; | |
2347 | ||
2348 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2349 | { | |
33120b30 | 2350 | struct seq_file *m = p_arg; |
1da177e4 | 2351 | |
33120b30 AD |
2352 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), |
2353 | rt->rt6i_dst.plen); | |
1da177e4 LT |
2354 | |
2355 | #ifdef CONFIG_IPV6_SUBTREES | |
33120b30 AD |
2356 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), |
2357 | rt->rt6i_src.plen); | |
1da177e4 | 2358 | #else |
33120b30 | 2359 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2360 | #endif |
2361 | ||
2362 | if (rt->rt6i_nexthop) { | |
33120b30 AD |
2363 | seq_printf(m, NIP6_SEQFMT, |
2364 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2365 | } else { |
33120b30 | 2366 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2367 | } |
33120b30 AD |
2368 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
2369 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2370 | rt->u.dst.__use, rt->rt6i_flags, | |
2371 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1da177e4 LT |
2372 | return 0; |
2373 | } | |
2374 | ||
33120b30 | 2375 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2376 | { |
f3db4851 DL |
2377 | struct net *net = (struct net *)m->private; |
2378 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2379 | return 0; |
2380 | } | |
1da177e4 | 2381 | |
33120b30 AD |
2382 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2383 | { | |
f3db4851 DL |
2384 | struct net *net = get_proc_net(inode); |
2385 | if (!net) | |
2386 | return -ENXIO; | |
2387 | return single_open(file, ipv6_route_show, net); | |
2388 | } | |
2389 | ||
2390 | static int ipv6_route_release(struct inode *inode, struct file *file) | |
2391 | { | |
2392 | struct seq_file *seq = file->private_data; | |
2393 | struct net *net = seq->private; | |
2394 | put_net(net); | |
2395 | return single_release(inode, file); | |
1da177e4 LT |
2396 | } |
2397 | ||
33120b30 AD |
2398 | static const struct file_operations ipv6_route_proc_fops = { |
2399 | .owner = THIS_MODULE, | |
2400 | .open = ipv6_route_open, | |
2401 | .read = seq_read, | |
2402 | .llseek = seq_lseek, | |
f3db4851 | 2403 | .release = ipv6_route_release, |
33120b30 AD |
2404 | }; |
2405 | ||
1da177e4 LT |
2406 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2407 | { | |
69ddb805 | 2408 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2409 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2410 | net->ipv6.rt6_stats->fib_nodes, |
2411 | net->ipv6.rt6_stats->fib_route_nodes, | |
2412 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2413 | net->ipv6.rt6_stats->fib_rt_entries, | |
2414 | net->ipv6.rt6_stats->fib_rt_cache, | |
f2fc6a54 | 2415 | atomic_read(&net->ipv6.ip6_dst_ops->entries), |
69ddb805 | 2416 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2417 | |
2418 | return 0; | |
2419 | } | |
2420 | ||
2421 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2422 | { | |
69ddb805 DL |
2423 | struct net *net = get_proc_net(inode); |
2424 | return single_open(file, rt6_stats_seq_show, net); | |
2425 | } | |
2426 | ||
2427 | static int rt6_stats_seq_release(struct inode *inode, struct file *file) | |
2428 | { | |
2429 | struct seq_file *seq = file->private_data; | |
2430 | struct net *net = (struct net *)seq->private; | |
2431 | put_net(net); | |
2432 | return single_release(inode, file); | |
1da177e4 LT |
2433 | } |
2434 | ||
9a32144e | 2435 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2436 | .owner = THIS_MODULE, |
2437 | .open = rt6_stats_seq_open, | |
2438 | .read = seq_read, | |
2439 | .llseek = seq_lseek, | |
69ddb805 | 2440 | .release = rt6_stats_seq_release, |
1da177e4 LT |
2441 | }; |
2442 | #endif /* CONFIG_PROC_FS */ | |
2443 | ||
2444 | #ifdef CONFIG_SYSCTL | |
2445 | ||
1da177e4 LT |
2446 | static |
2447 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2448 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2449 | { | |
5b7c931d DL |
2450 | struct net *net = current->nsproxy->net_ns; |
2451 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 LT |
2452 | if (write) { |
2453 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
5b7c931d | 2454 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2455 | return 0; |
2456 | } else | |
2457 | return -EINVAL; | |
2458 | } | |
2459 | ||
760f2d01 | 2460 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2461 | { |
1da177e4 | 2462 | .procname = "flush", |
4990509f | 2463 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2464 | .maxlen = sizeof(int), |
89c8b3a1 | 2465 | .mode = 0200, |
1ab1457c | 2466 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2467 | }, |
2468 | { | |
2469 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2470 | .procname = "gc_thresh", | |
9a7ec3a9 | 2471 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2472 | .maxlen = sizeof(int), |
2473 | .mode = 0644, | |
1ab1457c | 2474 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2475 | }, |
2476 | { | |
2477 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2478 | .procname = "max_size", | |
4990509f | 2479 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2480 | .maxlen = sizeof(int), |
2481 | .mode = 0644, | |
1ab1457c | 2482 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2483 | }, |
2484 | { | |
2485 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2486 | .procname = "gc_min_interval", | |
4990509f | 2487 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2488 | .maxlen = sizeof(int), |
2489 | .mode = 0644, | |
1ab1457c | 2490 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2491 | .strategy = &sysctl_jiffies, |
2492 | }, | |
2493 | { | |
2494 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2495 | .procname = "gc_timeout", | |
4990509f | 2496 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2497 | .maxlen = sizeof(int), |
2498 | .mode = 0644, | |
1ab1457c | 2499 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2500 | .strategy = &sysctl_jiffies, |
2501 | }, | |
2502 | { | |
2503 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2504 | .procname = "gc_interval", | |
4990509f | 2505 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2506 | .maxlen = sizeof(int), |
2507 | .mode = 0644, | |
1ab1457c | 2508 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2509 | .strategy = &sysctl_jiffies, |
2510 | }, | |
2511 | { | |
2512 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2513 | .procname = "gc_elasticity", | |
4990509f | 2514 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2515 | .maxlen = sizeof(int), |
2516 | .mode = 0644, | |
1ab1457c | 2517 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2518 | .strategy = &sysctl_jiffies, |
2519 | }, | |
2520 | { | |
2521 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2522 | .procname = "mtu_expires", | |
4990509f | 2523 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2524 | .maxlen = sizeof(int), |
2525 | .mode = 0644, | |
1ab1457c | 2526 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2527 | .strategy = &sysctl_jiffies, |
2528 | }, | |
2529 | { | |
2530 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2531 | .procname = "min_adv_mss", | |
4990509f | 2532 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2533 | .maxlen = sizeof(int), |
2534 | .mode = 0644, | |
1ab1457c | 2535 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2536 | .strategy = &sysctl_jiffies, |
2537 | }, | |
2538 | { | |
2539 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2540 | .procname = "gc_min_interval_ms", | |
4990509f | 2541 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2542 | .maxlen = sizeof(int), |
2543 | .mode = 0644, | |
1ab1457c | 2544 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2545 | .strategy = &sysctl_ms_jiffies, |
2546 | }, | |
2547 | { .ctl_name = 0 } | |
2548 | }; | |
2549 | ||
760f2d01 DL |
2550 | struct ctl_table *ipv6_route_sysctl_init(struct net *net) |
2551 | { | |
2552 | struct ctl_table *table; | |
2553 | ||
2554 | table = kmemdup(ipv6_route_table_template, | |
2555 | sizeof(ipv6_route_table_template), | |
2556 | GFP_KERNEL); | |
5ee09105 YH |
2557 | |
2558 | if (table) { | |
2559 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
f2fc6a54 | 2560 | table[1].data = &net->ipv6.ip6_dst_ops->gc_thresh; |
5ee09105 YH |
2561 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2562 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2563 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2564 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2565 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2566 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2567 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
2568 | } | |
2569 | ||
760f2d01 DL |
2570 | return table; |
2571 | } | |
1da177e4 LT |
2572 | #endif |
2573 | ||
cdb18761 DL |
2574 | static int ip6_route_net_init(struct net *net) |
2575 | { | |
8ed67789 DL |
2576 | int ret = 0; |
2577 | ||
2578 | ret = -ENOMEM; | |
f2fc6a54 BT |
2579 | net->ipv6.ip6_dst_ops = kmemdup(&ip6_dst_ops_template, |
2580 | sizeof(*net->ipv6.ip6_dst_ops), | |
2581 | GFP_KERNEL); | |
2582 | if (!net->ipv6.ip6_dst_ops) | |
2583 | goto out; | |
2584 | net->ipv6.ip6_dst_ops->dst_net = net; | |
2585 | ||
8ed67789 DL |
2586 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2587 | sizeof(*net->ipv6.ip6_null_entry), | |
2588 | GFP_KERNEL); | |
2589 | if (!net->ipv6.ip6_null_entry) | |
f2fc6a54 | 2590 | goto out_ip6_dst_ops; |
8ed67789 DL |
2591 | net->ipv6.ip6_null_entry->u.dst.path = |
2592 | (struct dst_entry *)net->ipv6.ip6_null_entry; | |
f2fc6a54 | 2593 | net->ipv6.ip6_null_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2594 | |
2595 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2596 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2597 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2598 | GFP_KERNEL); | |
2599 | if (!net->ipv6.ip6_prohibit_entry) { | |
2600 | kfree(net->ipv6.ip6_null_entry); | |
2601 | goto out; | |
2602 | } | |
2603 | net->ipv6.ip6_prohibit_entry->u.dst.path = | |
2604 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; | |
f2fc6a54 | 2605 | net->ipv6.ip6_prohibit_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2606 | |
2607 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2608 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2609 | GFP_KERNEL); | |
2610 | if (!net->ipv6.ip6_blk_hole_entry) { | |
2611 | kfree(net->ipv6.ip6_null_entry); | |
2612 | kfree(net->ipv6.ip6_prohibit_entry); | |
2613 | goto out; | |
2614 | } | |
2615 | net->ipv6.ip6_blk_hole_entry->u.dst.path = | |
2616 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; | |
f2fc6a54 | 2617 | net->ipv6.ip6_blk_hole_entry->u.dst.ops = net->ipv6.ip6_dst_ops; |
8ed67789 DL |
2618 | #endif |
2619 | ||
cdb18761 DL |
2620 | #ifdef CONFIG_PROC_FS |
2621 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2622 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2623 | #endif | |
6891a346 BT |
2624 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2625 | ||
8ed67789 DL |
2626 | ret = 0; |
2627 | out: | |
2628 | return ret; | |
f2fc6a54 BT |
2629 | |
2630 | out_ip6_dst_ops: | |
2631 | kfree(net->ipv6.ip6_dst_ops); | |
2632 | goto out; | |
cdb18761 DL |
2633 | } |
2634 | ||
2635 | static void ip6_route_net_exit(struct net *net) | |
2636 | { | |
2637 | #ifdef CONFIG_PROC_FS | |
2638 | proc_net_remove(net, "ipv6_route"); | |
2639 | proc_net_remove(net, "rt6_stats"); | |
2640 | #endif | |
8ed67789 DL |
2641 | kfree(net->ipv6.ip6_null_entry); |
2642 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2643 | kfree(net->ipv6.ip6_prohibit_entry); | |
2644 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2645 | #endif | |
f2fc6a54 | 2646 | kfree(net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2647 | } |
2648 | ||
2649 | static struct pernet_operations ip6_route_net_ops = { | |
2650 | .init = ip6_route_net_init, | |
2651 | .exit = ip6_route_net_exit, | |
2652 | }; | |
2653 | ||
8ed67789 DL |
2654 | static struct notifier_block ip6_route_dev_notifier = { |
2655 | .notifier_call = ip6_route_dev_notify, | |
2656 | .priority = 0, | |
2657 | }; | |
2658 | ||
433d49c3 | 2659 | int __init ip6_route_init(void) |
1da177e4 | 2660 | { |
433d49c3 DL |
2661 | int ret; |
2662 | ||
9a7ec3a9 DL |
2663 | ret = -ENOMEM; |
2664 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2665 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2666 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2667 | if (!ip6_dst_ops_template.kmem_cachep) |
f2fc6a54 | 2668 | goto out;; |
14e50e57 | 2669 | |
8ed67789 DL |
2670 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2671 | if (ret) | |
bdb3289f | 2672 | goto out_kmem_cache; |
bdb3289f | 2673 | |
8ed67789 DL |
2674 | /* Registering of the loopback is done before this portion of code, |
2675 | * the loopback reference in rt6_info will not be taken, do it | |
2676 | * manually for init_net */ | |
2677 | init_net.ipv6.ip6_null_entry->u.dst.dev = init_net.loopback_dev; | |
2678 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2679 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2680 | init_net.ipv6.ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev; | |
2681 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2682 | init_net.ipv6.ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev; | |
2683 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
2684 | #endif | |
433d49c3 DL |
2685 | ret = fib6_init(); |
2686 | if (ret) | |
8ed67789 | 2687 | goto out_register_subsys; |
433d49c3 | 2688 | |
433d49c3 DL |
2689 | ret = xfrm6_init(); |
2690 | if (ret) | |
cdb18761 | 2691 | goto out_fib6_init; |
c35b7e72 | 2692 | |
433d49c3 DL |
2693 | ret = fib6_rules_init(); |
2694 | if (ret) | |
2695 | goto xfrm6_init; | |
7e5449c2 | 2696 | |
433d49c3 DL |
2697 | ret = -ENOBUFS; |
2698 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2699 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2700 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2701 | goto fib6_rules_init; | |
c127ea2c | 2702 | |
8ed67789 | 2703 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2704 | if (ret) |
2705 | goto fib6_rules_init; | |
8ed67789 | 2706 | |
433d49c3 DL |
2707 | out: |
2708 | return ret; | |
2709 | ||
2710 | fib6_rules_init: | |
433d49c3 DL |
2711 | fib6_rules_cleanup(); |
2712 | xfrm6_init: | |
433d49c3 | 2713 | xfrm6_fini(); |
433d49c3 | 2714 | out_fib6_init: |
433d49c3 | 2715 | fib6_gc_cleanup(); |
8ed67789 DL |
2716 | out_register_subsys: |
2717 | unregister_pernet_subsys(&ip6_route_net_ops); | |
433d49c3 | 2718 | out_kmem_cache: |
f2fc6a54 | 2719 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2720 | goto out; |
1da177e4 LT |
2721 | } |
2722 | ||
2723 | void ip6_route_cleanup(void) | |
2724 | { | |
8ed67789 | 2725 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2726 | fib6_rules_cleanup(); |
1da177e4 | 2727 | xfrm6_fini(); |
1da177e4 | 2728 | fib6_gc_cleanup(); |
8ed67789 | 2729 | unregister_pernet_subsys(&ip6_route_net_ops); |
f2fc6a54 | 2730 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2731 | } |