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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
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. | |
25 | */ | |
26 | ||
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/times.h> | |
31 | #include <linux/socket.h> | |
32 | #include <linux/sockios.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/route.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/in6.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/netlink.h> | |
39 | #include <linux/if_arp.h> | |
40 | ||
41 | #ifdef CONFIG_PROC_FS | |
42 | #include <linux/proc_fs.h> | |
43 | #include <linux/seq_file.h> | |
44 | #endif | |
45 | ||
46 | #include <net/snmp.h> | |
47 | #include <net/ipv6.h> | |
48 | #include <net/ip6_fib.h> | |
49 | #include <net/ip6_route.h> | |
50 | #include <net/ndisc.h> | |
51 | #include <net/addrconf.h> | |
52 | #include <net/tcp.h> | |
53 | #include <linux/rtnetlink.h> | |
54 | #include <net/dst.h> | |
55 | #include <net/xfrm.h> | |
8d71740c | 56 | #include <net/netevent.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 | |
554cfb7e YH |
77 | #define RT6_SELECT_F_IFACE 0x1 |
78 | #define RT6_SELECT_F_REACHABLE 0x2 | |
79 | ||
1da177e4 LT |
80 | static int ip6_rt_max_size = 4096; |
81 | static int ip6_rt_gc_min_interval = HZ / 2; | |
82 | static int ip6_rt_gc_timeout = 60*HZ; | |
83 | int ip6_rt_gc_interval = 30*HZ; | |
84 | static int ip6_rt_gc_elasticity = 9; | |
85 | static int ip6_rt_mtu_expires = 10*60*HZ; | |
86 | static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
87 | ||
88 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); | |
89 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
90 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
91 | static void ip6_dst_destroy(struct dst_entry *); | |
92 | static void ip6_dst_ifdown(struct dst_entry *, | |
93 | struct net_device *dev, int how); | |
94 | static int ip6_dst_gc(void); | |
95 | ||
96 | static int ip6_pkt_discard(struct sk_buff *skb); | |
97 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
98 | static void ip6_link_failure(struct sk_buff *skb); | |
99 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
100 | ||
70ceb4f5 YH |
101 | #ifdef CONFIG_IPV6_ROUTE_INFO |
102 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
103 | struct in6_addr *gwaddr, int ifindex, | |
104 | unsigned pref); | |
105 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
106 | struct in6_addr *gwaddr, int ifindex); | |
107 | #endif | |
108 | ||
1da177e4 LT |
109 | static struct dst_ops ip6_dst_ops = { |
110 | .family = AF_INET6, | |
111 | .protocol = __constant_htons(ETH_P_IPV6), | |
112 | .gc = ip6_dst_gc, | |
113 | .gc_thresh = 1024, | |
114 | .check = ip6_dst_check, | |
115 | .destroy = ip6_dst_destroy, | |
116 | .ifdown = ip6_dst_ifdown, | |
117 | .negative_advice = ip6_negative_advice, | |
118 | .link_failure = ip6_link_failure, | |
119 | .update_pmtu = ip6_rt_update_pmtu, | |
120 | .entry_size = sizeof(struct rt6_info), | |
121 | }; | |
122 | ||
123 | struct rt6_info ip6_null_entry = { | |
124 | .u = { | |
125 | .dst = { | |
126 | .__refcnt = ATOMIC_INIT(1), | |
127 | .__use = 1, | |
128 | .dev = &loopback_dev, | |
129 | .obsolete = -1, | |
130 | .error = -ENETUNREACH, | |
131 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
132 | .input = ip6_pkt_discard, | |
133 | .output = ip6_pkt_discard_out, | |
134 | .ops = &ip6_dst_ops, | |
135 | .path = (struct dst_entry*)&ip6_null_entry, | |
136 | } | |
137 | }, | |
138 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
139 | .rt6i_metric = ~(u32) 0, | |
140 | .rt6i_ref = ATOMIC_INIT(1), | |
141 | }; | |
142 | ||
143 | struct fib6_node ip6_routing_table = { | |
144 | .leaf = &ip6_null_entry, | |
145 | .fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO, | |
146 | }; | |
147 | ||
148 | /* Protects all the ip6 fib */ | |
149 | ||
150 | DEFINE_RWLOCK(rt6_lock); | |
151 | ||
152 | ||
153 | /* allocate dst with ip6_dst_ops */ | |
154 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
155 | { | |
156 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
157 | } | |
158 | ||
159 | static void ip6_dst_destroy(struct dst_entry *dst) | |
160 | { | |
161 | struct rt6_info *rt = (struct rt6_info *)dst; | |
162 | struct inet6_dev *idev = rt->rt6i_idev; | |
163 | ||
164 | if (idev != NULL) { | |
165 | rt->rt6i_idev = NULL; | |
166 | in6_dev_put(idev); | |
167 | } | |
168 | } | |
169 | ||
170 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
171 | int how) | |
172 | { | |
173 | struct rt6_info *rt = (struct rt6_info *)dst; | |
174 | struct inet6_dev *idev = rt->rt6i_idev; | |
175 | ||
176 | if (dev != &loopback_dev && idev != NULL && idev->dev == dev) { | |
177 | struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev); | |
178 | if (loopback_idev != NULL) { | |
179 | rt->rt6i_idev = loopback_idev; | |
180 | in6_dev_put(idev); | |
181 | } | |
182 | } | |
183 | } | |
184 | ||
185 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
186 | { | |
187 | return (rt->rt6i_flags & RTF_EXPIRES && | |
188 | time_after(jiffies, rt->rt6i_expires)); | |
189 | } | |
190 | ||
191 | /* | |
192 | * Route lookup. Any rt6_lock is implied. | |
193 | */ | |
194 | ||
195 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
196 | int oif, | |
197 | int strict) | |
198 | { | |
199 | struct rt6_info *local = NULL; | |
200 | struct rt6_info *sprt; | |
201 | ||
202 | if (oif) { | |
203 | for (sprt = rt; sprt; sprt = sprt->u.next) { | |
204 | struct net_device *dev = sprt->rt6i_dev; | |
205 | if (dev->ifindex == oif) | |
206 | return sprt; | |
207 | if (dev->flags & IFF_LOOPBACK) { | |
208 | if (sprt->rt6i_idev == NULL || | |
209 | sprt->rt6i_idev->dev->ifindex != oif) { | |
210 | if (strict && oif) | |
211 | continue; | |
212 | if (local && (!oif || | |
213 | local->rt6i_idev->dev->ifindex == oif)) | |
214 | continue; | |
215 | } | |
216 | local = sprt; | |
217 | } | |
218 | } | |
219 | ||
220 | if (local) | |
221 | return local; | |
222 | ||
223 | if (strict) | |
224 | return &ip6_null_entry; | |
225 | } | |
226 | return rt; | |
227 | } | |
228 | ||
27097255 YH |
229 | #ifdef CONFIG_IPV6_ROUTER_PREF |
230 | static void rt6_probe(struct rt6_info *rt) | |
231 | { | |
232 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
233 | /* | |
234 | * Okay, this does not seem to be appropriate | |
235 | * for now, however, we need to check if it | |
236 | * is really so; aka Router Reachability Probing. | |
237 | * | |
238 | * Router Reachability Probe MUST be rate-limited | |
239 | * to no more than one per minute. | |
240 | */ | |
241 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
242 | return; | |
243 | read_lock_bh(&neigh->lock); | |
244 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 245 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
246 | struct in6_addr mcaddr; |
247 | struct in6_addr *target; | |
248 | ||
249 | neigh->updated = jiffies; | |
250 | read_unlock_bh(&neigh->lock); | |
251 | ||
252 | target = (struct in6_addr *)&neigh->primary_key; | |
253 | addrconf_addr_solict_mult(target, &mcaddr); | |
254 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
255 | } else | |
256 | read_unlock_bh(&neigh->lock); | |
257 | } | |
258 | #else | |
259 | static inline void rt6_probe(struct rt6_info *rt) | |
260 | { | |
261 | return; | |
262 | } | |
263 | #endif | |
264 | ||
1da177e4 | 265 | /* |
554cfb7e | 266 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 267 | */ |
554cfb7e YH |
268 | static int inline rt6_check_dev(struct rt6_info *rt, int oif) |
269 | { | |
270 | struct net_device *dev = rt->rt6i_dev; | |
271 | if (!oif || dev->ifindex == oif) | |
272 | return 2; | |
273 | if ((dev->flags & IFF_LOOPBACK) && | |
274 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
275 | return 1; | |
276 | return 0; | |
277 | } | |
1da177e4 | 278 | |
554cfb7e | 279 | static int inline rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 280 | { |
554cfb7e YH |
281 | struct neighbour *neigh = rt->rt6i_nexthop; |
282 | int m = 0; | |
4d0c5911 YH |
283 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
284 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
285 | m = 1; | |
286 | else if (neigh) { | |
554cfb7e YH |
287 | read_lock_bh(&neigh->lock); |
288 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 289 | m = 2; |
554cfb7e | 290 | read_unlock_bh(&neigh->lock); |
1da177e4 | 291 | } |
554cfb7e | 292 | return m; |
1da177e4 LT |
293 | } |
294 | ||
554cfb7e YH |
295 | static int rt6_score_route(struct rt6_info *rt, int oif, |
296 | int strict) | |
1da177e4 | 297 | { |
4d0c5911 YH |
298 | int m, n; |
299 | ||
300 | m = rt6_check_dev(rt, oif); | |
554cfb7e YH |
301 | if (!m && (strict & RT6_SELECT_F_IFACE)) |
302 | return -1; | |
ebacaaa0 YH |
303 | #ifdef CONFIG_IPV6_ROUTER_PREF |
304 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
305 | #endif | |
4d0c5911 YH |
306 | n = rt6_check_neigh(rt); |
307 | if (n > 1) | |
ebacaaa0 | 308 | m |= 16; |
4d0c5911 | 309 | else if (!n && strict & RT6_SELECT_F_REACHABLE) |
554cfb7e YH |
310 | return -1; |
311 | return m; | |
312 | } | |
313 | ||
314 | static struct rt6_info *rt6_select(struct rt6_info **head, int oif, | |
315 | int strict) | |
316 | { | |
317 | struct rt6_info *match = NULL, *last = NULL; | |
318 | struct rt6_info *rt, *rt0 = *head; | |
319 | u32 metric; | |
320 | int mpri = -1; | |
1da177e4 | 321 | |
554cfb7e YH |
322 | RT6_TRACE("%s(head=%p(*head=%p), oif=%d)\n", |
323 | __FUNCTION__, head, head ? *head : NULL, oif); | |
1da177e4 | 324 | |
554cfb7e | 325 | for (rt = rt0, metric = rt0->rt6i_metric; |
c302e6d5 | 326 | rt && rt->rt6i_metric == metric && (!last || rt != rt0); |
554cfb7e YH |
327 | rt = rt->u.next) { |
328 | int m; | |
1da177e4 | 329 | |
554cfb7e | 330 | if (rt6_check_expired(rt)) |
1da177e4 LT |
331 | continue; |
332 | ||
554cfb7e YH |
333 | last = rt; |
334 | ||
335 | m = rt6_score_route(rt, oif, strict); | |
336 | if (m < 0) | |
1da177e4 | 337 | continue; |
1da177e4 | 338 | |
554cfb7e | 339 | if (m > mpri) { |
27097255 | 340 | rt6_probe(match); |
554cfb7e | 341 | match = rt; |
1da177e4 | 342 | mpri = m; |
27097255 YH |
343 | } else { |
344 | rt6_probe(rt); | |
1da177e4 LT |
345 | } |
346 | } | |
347 | ||
554cfb7e YH |
348 | if (!match && |
349 | (strict & RT6_SELECT_F_REACHABLE) && | |
350 | last && last != rt0) { | |
351 | /* no entries matched; do round-robin */ | |
34af946a | 352 | static DEFINE_SPINLOCK(lock); |
c302e6d5 | 353 | spin_lock(&lock); |
554cfb7e YH |
354 | *head = rt0->u.next; |
355 | rt0->u.next = last->u.next; | |
356 | last->u.next = rt0; | |
c302e6d5 | 357 | spin_unlock(&lock); |
1da177e4 | 358 | } |
1da177e4 | 359 | |
554cfb7e YH |
360 | RT6_TRACE("%s() => %p, score=%d\n", |
361 | __FUNCTION__, match, mpri); | |
1da177e4 | 362 | |
554cfb7e | 363 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
364 | } |
365 | ||
70ceb4f5 YH |
366 | #ifdef CONFIG_IPV6_ROUTE_INFO |
367 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
368 | struct in6_addr *gwaddr) | |
369 | { | |
370 | struct route_info *rinfo = (struct route_info *) opt; | |
371 | struct in6_addr prefix_buf, *prefix; | |
372 | unsigned int pref; | |
373 | u32 lifetime; | |
374 | struct rt6_info *rt; | |
375 | ||
376 | if (len < sizeof(struct route_info)) { | |
377 | return -EINVAL; | |
378 | } | |
379 | ||
380 | /* Sanity check for prefix_len and length */ | |
381 | if (rinfo->length > 3) { | |
382 | return -EINVAL; | |
383 | } else if (rinfo->prefix_len > 128) { | |
384 | return -EINVAL; | |
385 | } else if (rinfo->prefix_len > 64) { | |
386 | if (rinfo->length < 2) { | |
387 | return -EINVAL; | |
388 | } | |
389 | } else if (rinfo->prefix_len > 0) { | |
390 | if (rinfo->length < 1) { | |
391 | return -EINVAL; | |
392 | } | |
393 | } | |
394 | ||
395 | pref = rinfo->route_pref; | |
396 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
397 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
398 | ||
399 | lifetime = htonl(rinfo->lifetime); | |
400 | if (lifetime == 0xffffffff) { | |
401 | /* infinity */ | |
402 | } else if (lifetime > 0x7fffffff/HZ) { | |
403 | /* Avoid arithmetic overflow */ | |
404 | lifetime = 0x7fffffff/HZ - 1; | |
405 | } | |
406 | ||
407 | if (rinfo->length == 3) | |
408 | prefix = (struct in6_addr *)rinfo->prefix; | |
409 | else { | |
410 | /* this function is safe */ | |
411 | ipv6_addr_prefix(&prefix_buf, | |
412 | (struct in6_addr *)rinfo->prefix, | |
413 | rinfo->prefix_len); | |
414 | prefix = &prefix_buf; | |
415 | } | |
416 | ||
417 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
418 | ||
419 | if (rt && !lifetime) { | |
420 | ip6_del_rt(rt, NULL, NULL, NULL); | |
421 | rt = NULL; | |
422 | } | |
423 | ||
424 | if (!rt && lifetime) | |
425 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
426 | pref); | |
427 | else if (rt) | |
428 | rt->rt6i_flags = RTF_ROUTEINFO | | |
429 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
430 | ||
431 | if (rt) { | |
432 | if (lifetime == 0xffffffff) { | |
433 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
434 | } else { | |
435 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
436 | rt->rt6i_flags |= RTF_EXPIRES; | |
437 | } | |
438 | dst_release(&rt->u.dst); | |
439 | } | |
440 | return 0; | |
441 | } | |
442 | #endif | |
443 | ||
1da177e4 LT |
444 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, |
445 | int oif, int strict) | |
446 | { | |
447 | struct fib6_node *fn; | |
448 | struct rt6_info *rt; | |
449 | ||
450 | read_lock_bh(&rt6_lock); | |
451 | fn = fib6_lookup(&ip6_routing_table, daddr, saddr); | |
452 | rt = rt6_device_match(fn->leaf, oif, strict); | |
453 | dst_hold(&rt->u.dst); | |
454 | rt->u.dst.__use++; | |
455 | read_unlock_bh(&rt6_lock); | |
456 | ||
457 | rt->u.dst.lastuse = jiffies; | |
458 | if (rt->u.dst.error == 0) | |
459 | return rt; | |
460 | dst_release(&rt->u.dst); | |
461 | return NULL; | |
462 | } | |
463 | ||
464 | /* ip6_ins_rt is called with FREE rt6_lock. | |
465 | It takes new route entry, the addition fails by any reason the | |
466 | route is freed. In any case, if caller does not hold it, it may | |
467 | be destroyed. | |
468 | */ | |
469 | ||
0d51aa80 JHS |
470 | int ip6_ins_rt(struct rt6_info *rt, struct nlmsghdr *nlh, |
471 | void *_rtattr, struct netlink_skb_parms *req) | |
1da177e4 LT |
472 | { |
473 | int err; | |
474 | ||
475 | write_lock_bh(&rt6_lock); | |
0d51aa80 | 476 | err = fib6_add(&ip6_routing_table, rt, nlh, _rtattr, req); |
1da177e4 LT |
477 | write_unlock_bh(&rt6_lock); |
478 | ||
479 | return err; | |
480 | } | |
481 | ||
95a9a5ba YH |
482 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
483 | struct in6_addr *saddr) | |
1da177e4 | 484 | { |
1da177e4 LT |
485 | struct rt6_info *rt; |
486 | ||
487 | /* | |
488 | * Clone the route. | |
489 | */ | |
490 | ||
491 | rt = ip6_rt_copy(ort); | |
492 | ||
493 | if (rt) { | |
58c4fb86 YH |
494 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
495 | if (rt->rt6i_dst.plen != 128 && | |
496 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
497 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 498 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 499 | } |
1da177e4 | 500 | |
58c4fb86 | 501 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
502 | rt->rt6i_dst.plen = 128; |
503 | rt->rt6i_flags |= RTF_CACHE; | |
504 | rt->u.dst.flags |= DST_HOST; | |
505 | ||
506 | #ifdef CONFIG_IPV6_SUBTREES | |
507 | if (rt->rt6i_src.plen && saddr) { | |
508 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
509 | rt->rt6i_src.plen = 128; | |
510 | } | |
511 | #endif | |
512 | ||
513 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
514 | ||
95a9a5ba | 515 | } |
1da177e4 | 516 | |
95a9a5ba YH |
517 | return rt; |
518 | } | |
1da177e4 | 519 | |
299d9939 YH |
520 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
521 | { | |
522 | struct rt6_info *rt = ip6_rt_copy(ort); | |
523 | if (rt) { | |
524 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
525 | rt->rt6i_dst.plen = 128; | |
526 | rt->rt6i_flags |= RTF_CACHE; | |
527 | if (rt->rt6i_flags & RTF_REJECT) | |
528 | rt->u.dst.error = ort->u.dst.error; | |
529 | rt->u.dst.flags |= DST_HOST; | |
530 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
531 | } | |
532 | return rt; | |
533 | } | |
534 | ||
1da177e4 | 535 | #define BACKTRACK() \ |
bb133964 | 536 | if (rt == &ip6_null_entry) { \ |
1da177e4 LT |
537 | while ((fn = fn->parent) != NULL) { \ |
538 | if (fn->fn_flags & RTN_ROOT) { \ | |
1da177e4 LT |
539 | goto out; \ |
540 | } \ | |
541 | if (fn->fn_flags & RTN_RTINFO) \ | |
542 | goto restart; \ | |
543 | } \ | |
544 | } | |
545 | ||
546 | ||
547 | void ip6_route_input(struct sk_buff *skb) | |
548 | { | |
549 | struct fib6_node *fn; | |
519fbd87 | 550 | struct rt6_info *rt, *nrt; |
1da177e4 LT |
551 | int strict; |
552 | int attempts = 3; | |
519fbd87 | 553 | int err; |
8238dd06 | 554 | int reachable = RT6_SELECT_F_REACHABLE; |
1da177e4 | 555 | |
118f8c16 | 556 | strict = ipv6_addr_type(&skb->nh.ipv6h->daddr) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL) ? RT6_SELECT_F_IFACE : 0; |
1da177e4 LT |
557 | |
558 | relookup: | |
559 | read_lock_bh(&rt6_lock); | |
560 | ||
8238dd06 | 561 | restart_2: |
1da177e4 LT |
562 | fn = fib6_lookup(&ip6_routing_table, &skb->nh.ipv6h->daddr, |
563 | &skb->nh.ipv6h->saddr); | |
564 | ||
565 | restart: | |
8238dd06 | 566 | rt = rt6_select(&fn->leaf, skb->dev->ifindex, strict | reachable); |
1da177e4 | 567 | BACKTRACK(); |
8238dd06 YH |
568 | if (rt == &ip6_null_entry || |
569 | rt->rt6i_flags & RTF_CACHE) | |
1ddef044 | 570 | goto out; |
1da177e4 | 571 | |
fb9de91e YH |
572 | dst_hold(&rt->u.dst); |
573 | read_unlock_bh(&rt6_lock); | |
574 | ||
519fbd87 YH |
575 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
576 | nrt = rt6_alloc_cow(rt, &skb->nh.ipv6h->daddr, &skb->nh.ipv6h->saddr); | |
577 | else { | |
578 | #if CLONE_OFFLINK_ROUTE | |
579 | nrt = rt6_alloc_clone(rt, &skb->nh.ipv6h->daddr); | |
580 | #else | |
581 | goto out2; | |
582 | #endif | |
583 | } | |
e40cf353 | 584 | |
519fbd87 YH |
585 | dst_release(&rt->u.dst); |
586 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 587 | |
519fbd87 YH |
588 | dst_hold(&rt->u.dst); |
589 | if (nrt) { | |
590 | err = ip6_ins_rt(nrt, NULL, NULL, &NETLINK_CB(skb)); | |
591 | if (!err) | |
1da177e4 | 592 | goto out2; |
1da177e4 | 593 | } |
1da177e4 | 594 | |
519fbd87 YH |
595 | if (--attempts <= 0) |
596 | goto out2; | |
597 | ||
598 | /* | |
599 | * Race condition! In the gap, when rt6_lock was | |
600 | * released someone could insert this route. Relookup. | |
601 | */ | |
602 | dst_release(&rt->u.dst); | |
603 | goto relookup; | |
604 | ||
605 | out: | |
8238dd06 YH |
606 | if (reachable) { |
607 | reachable = 0; | |
608 | goto restart_2; | |
609 | } | |
519fbd87 YH |
610 | dst_hold(&rt->u.dst); |
611 | read_unlock_bh(&rt6_lock); | |
1da177e4 LT |
612 | out2: |
613 | rt->u.dst.lastuse = jiffies; | |
614 | rt->u.dst.__use++; | |
615 | skb->dst = (struct dst_entry *) rt; | |
fb9de91e | 616 | return; |
1da177e4 LT |
617 | } |
618 | ||
619 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
620 | { | |
621 | struct fib6_node *fn; | |
519fbd87 | 622 | struct rt6_info *rt, *nrt; |
1da177e4 LT |
623 | int strict; |
624 | int attempts = 3; | |
519fbd87 | 625 | int err; |
8238dd06 | 626 | int reachable = RT6_SELECT_F_REACHABLE; |
1da177e4 | 627 | |
554cfb7e | 628 | strict = ipv6_addr_type(&fl->fl6_dst) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL) ? RT6_SELECT_F_IFACE : 0; |
1da177e4 LT |
629 | |
630 | relookup: | |
631 | read_lock_bh(&rt6_lock); | |
632 | ||
8238dd06 | 633 | restart_2: |
1da177e4 LT |
634 | fn = fib6_lookup(&ip6_routing_table, &fl->fl6_dst, &fl->fl6_src); |
635 | ||
636 | restart: | |
8238dd06 | 637 | rt = rt6_select(&fn->leaf, fl->oif, strict | reachable); |
1ddef044 | 638 | BACKTRACK(); |
8238dd06 YH |
639 | if (rt == &ip6_null_entry || |
640 | rt->rt6i_flags & RTF_CACHE) | |
1da177e4 | 641 | goto out; |
1da177e4 | 642 | |
fb9de91e YH |
643 | dst_hold(&rt->u.dst); |
644 | read_unlock_bh(&rt6_lock); | |
645 | ||
519fbd87 | 646 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
e40cf353 | 647 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
648 | else { |
649 | #if CLONE_OFFLINK_ROUTE | |
650 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); | |
651 | #else | |
652 | goto out2; | |
653 | #endif | |
654 | } | |
1da177e4 | 655 | |
519fbd87 YH |
656 | dst_release(&rt->u.dst); |
657 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 658 | |
519fbd87 YH |
659 | dst_hold(&rt->u.dst); |
660 | if (nrt) { | |
661 | err = ip6_ins_rt(nrt, NULL, NULL, NULL); | |
662 | if (!err) | |
1da177e4 | 663 | goto out2; |
1da177e4 | 664 | } |
e40cf353 | 665 | |
519fbd87 YH |
666 | if (--attempts <= 0) |
667 | goto out2; | |
668 | ||
669 | /* | |
670 | * Race condition! In the gap, when rt6_lock was | |
671 | * released someone could insert this route. Relookup. | |
672 | */ | |
673 | dst_release(&rt->u.dst); | |
674 | goto relookup; | |
675 | ||
676 | out: | |
8238dd06 YH |
677 | if (reachable) { |
678 | reachable = 0; | |
679 | goto restart_2; | |
680 | } | |
519fbd87 YH |
681 | dst_hold(&rt->u.dst); |
682 | read_unlock_bh(&rt6_lock); | |
1da177e4 LT |
683 | out2: |
684 | rt->u.dst.lastuse = jiffies; | |
685 | rt->u.dst.__use++; | |
686 | return &rt->u.dst; | |
687 | } | |
688 | ||
689 | ||
690 | /* | |
691 | * Destination cache support functions | |
692 | */ | |
693 | ||
694 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
695 | { | |
696 | struct rt6_info *rt; | |
697 | ||
698 | rt = (struct rt6_info *) dst; | |
699 | ||
700 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
701 | return dst; | |
702 | ||
703 | return NULL; | |
704 | } | |
705 | ||
706 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
707 | { | |
708 | struct rt6_info *rt = (struct rt6_info *) dst; | |
709 | ||
710 | if (rt) { | |
711 | if (rt->rt6i_flags & RTF_CACHE) | |
0d51aa80 | 712 | ip6_del_rt(rt, NULL, NULL, NULL); |
1da177e4 LT |
713 | else |
714 | dst_release(dst); | |
715 | } | |
716 | return NULL; | |
717 | } | |
718 | ||
719 | static void ip6_link_failure(struct sk_buff *skb) | |
720 | { | |
721 | struct rt6_info *rt; | |
722 | ||
723 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
724 | ||
725 | rt = (struct rt6_info *) skb->dst; | |
726 | if (rt) { | |
727 | if (rt->rt6i_flags&RTF_CACHE) { | |
728 | dst_set_expires(&rt->u.dst, 0); | |
729 | rt->rt6i_flags |= RTF_EXPIRES; | |
730 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
731 | rt->rt6i_node->fn_sernum = -1; | |
732 | } | |
733 | } | |
734 | ||
735 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
736 | { | |
737 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
738 | ||
739 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
740 | rt6->rt6i_flags |= RTF_MODIFIED; | |
741 | if (mtu < IPV6_MIN_MTU) { | |
742 | mtu = IPV6_MIN_MTU; | |
743 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
744 | } | |
745 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 746 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
747 | } |
748 | } | |
749 | ||
750 | /* Protected by rt6_lock. */ | |
751 | static struct dst_entry *ndisc_dst_gc_list; | |
752 | static int ipv6_get_mtu(struct net_device *dev); | |
753 | ||
754 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
755 | { | |
756 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
757 | ||
758 | if (mtu < ip6_rt_min_advmss) | |
759 | mtu = ip6_rt_min_advmss; | |
760 | ||
761 | /* | |
762 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and | |
763 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
764 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
765 | * rely only on pmtu discovery" | |
766 | */ | |
767 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
768 | mtu = IPV6_MAXPLEN; | |
769 | return mtu; | |
770 | } | |
771 | ||
772 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, | |
773 | struct neighbour *neigh, | |
774 | struct in6_addr *addr, | |
775 | int (*output)(struct sk_buff *)) | |
776 | { | |
777 | struct rt6_info *rt; | |
778 | struct inet6_dev *idev = in6_dev_get(dev); | |
779 | ||
780 | if (unlikely(idev == NULL)) | |
781 | return NULL; | |
782 | ||
783 | rt = ip6_dst_alloc(); | |
784 | if (unlikely(rt == NULL)) { | |
785 | in6_dev_put(idev); | |
786 | goto out; | |
787 | } | |
788 | ||
789 | dev_hold(dev); | |
790 | if (neigh) | |
791 | neigh_hold(neigh); | |
792 | else | |
793 | neigh = ndisc_get_neigh(dev, addr); | |
794 | ||
795 | rt->rt6i_dev = dev; | |
796 | rt->rt6i_idev = idev; | |
797 | rt->rt6i_nexthop = neigh; | |
798 | atomic_set(&rt->u.dst.__refcnt, 1); | |
799 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
800 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
801 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
802 | rt->u.dst.output = output; | |
803 | ||
804 | #if 0 /* there's no chance to use these for ndisc */ | |
805 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST | |
806 | ? DST_HOST | |
807 | : 0; | |
808 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
809 | rt->rt6i_dst.plen = 128; | |
810 | #endif | |
811 | ||
812 | write_lock_bh(&rt6_lock); | |
813 | rt->u.dst.next = ndisc_dst_gc_list; | |
814 | ndisc_dst_gc_list = &rt->u.dst; | |
815 | write_unlock_bh(&rt6_lock); | |
816 | ||
817 | fib6_force_start_gc(); | |
818 | ||
819 | out: | |
820 | return (struct dst_entry *)rt; | |
821 | } | |
822 | ||
823 | int ndisc_dst_gc(int *more) | |
824 | { | |
825 | struct dst_entry *dst, *next, **pprev; | |
826 | int freed; | |
827 | ||
828 | next = NULL; | |
829 | pprev = &ndisc_dst_gc_list; | |
830 | freed = 0; | |
831 | while ((dst = *pprev) != NULL) { | |
832 | if (!atomic_read(&dst->__refcnt)) { | |
833 | *pprev = dst->next; | |
834 | dst_free(dst); | |
835 | freed++; | |
836 | } else { | |
837 | pprev = &dst->next; | |
838 | (*more)++; | |
839 | } | |
840 | } | |
841 | ||
842 | return freed; | |
843 | } | |
844 | ||
845 | static int ip6_dst_gc(void) | |
846 | { | |
847 | static unsigned expire = 30*HZ; | |
848 | static unsigned long last_gc; | |
849 | unsigned long now = jiffies; | |
850 | ||
851 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && | |
852 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) | |
853 | goto out; | |
854 | ||
855 | expire++; | |
856 | fib6_run_gc(expire); | |
857 | last_gc = now; | |
858 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
859 | expire = ip6_rt_gc_timeout>>1; | |
860 | ||
861 | out: | |
862 | expire -= expire>>ip6_rt_gc_elasticity; | |
863 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); | |
864 | } | |
865 | ||
866 | /* Clean host part of a prefix. Not necessary in radix tree, | |
867 | but results in cleaner routing tables. | |
868 | ||
869 | Remove it only when all the things will work! | |
870 | */ | |
871 | ||
872 | static int ipv6_get_mtu(struct net_device *dev) | |
873 | { | |
874 | int mtu = IPV6_MIN_MTU; | |
875 | struct inet6_dev *idev; | |
876 | ||
877 | idev = in6_dev_get(dev); | |
878 | if (idev) { | |
879 | mtu = idev->cnf.mtu6; | |
880 | in6_dev_put(idev); | |
881 | } | |
882 | return mtu; | |
883 | } | |
884 | ||
885 | int ipv6_get_hoplimit(struct net_device *dev) | |
886 | { | |
887 | int hoplimit = ipv6_devconf.hop_limit; | |
888 | struct inet6_dev *idev; | |
889 | ||
890 | idev = in6_dev_get(dev); | |
891 | if (idev) { | |
892 | hoplimit = idev->cnf.hop_limit; | |
893 | in6_dev_put(idev); | |
894 | } | |
895 | return hoplimit; | |
896 | } | |
897 | ||
898 | /* | |
899 | * | |
900 | */ | |
901 | ||
0d51aa80 JHS |
902 | int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, |
903 | void *_rtattr, struct netlink_skb_parms *req) | |
1da177e4 LT |
904 | { |
905 | int err; | |
906 | struct rtmsg *r; | |
907 | struct rtattr **rta; | |
908 | struct rt6_info *rt = NULL; | |
909 | struct net_device *dev = NULL; | |
910 | struct inet6_dev *idev = NULL; | |
911 | int addr_type; | |
912 | ||
913 | rta = (struct rtattr **) _rtattr; | |
914 | ||
915 | if (rtmsg->rtmsg_dst_len > 128 || rtmsg->rtmsg_src_len > 128) | |
916 | return -EINVAL; | |
917 | #ifndef CONFIG_IPV6_SUBTREES | |
918 | if (rtmsg->rtmsg_src_len) | |
919 | return -EINVAL; | |
920 | #endif | |
921 | if (rtmsg->rtmsg_ifindex) { | |
922 | err = -ENODEV; | |
923 | dev = dev_get_by_index(rtmsg->rtmsg_ifindex); | |
924 | if (!dev) | |
925 | goto out; | |
926 | idev = in6_dev_get(dev); | |
927 | if (!idev) | |
928 | goto out; | |
929 | } | |
930 | ||
931 | if (rtmsg->rtmsg_metric == 0) | |
932 | rtmsg->rtmsg_metric = IP6_RT_PRIO_USER; | |
933 | ||
934 | rt = ip6_dst_alloc(); | |
935 | ||
936 | if (rt == NULL) { | |
937 | err = -ENOMEM; | |
938 | goto out; | |
939 | } | |
940 | ||
941 | rt->u.dst.obsolete = -1; | |
3dd4bc68 | 942 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(rtmsg->rtmsg_info); |
1da177e4 LT |
943 | if (nlh && (r = NLMSG_DATA(nlh))) { |
944 | rt->rt6i_protocol = r->rtm_protocol; | |
945 | } else { | |
946 | rt->rt6i_protocol = RTPROT_BOOT; | |
947 | } | |
948 | ||
949 | addr_type = ipv6_addr_type(&rtmsg->rtmsg_dst); | |
950 | ||
951 | if (addr_type & IPV6_ADDR_MULTICAST) | |
952 | rt->u.dst.input = ip6_mc_input; | |
953 | else | |
954 | rt->u.dst.input = ip6_forward; | |
955 | ||
956 | rt->u.dst.output = ip6_output; | |
957 | ||
958 | ipv6_addr_prefix(&rt->rt6i_dst.addr, | |
959 | &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len); | |
960 | rt->rt6i_dst.plen = rtmsg->rtmsg_dst_len; | |
961 | if (rt->rt6i_dst.plen == 128) | |
962 | rt->u.dst.flags = DST_HOST; | |
963 | ||
964 | #ifdef CONFIG_IPV6_SUBTREES | |
965 | ipv6_addr_prefix(&rt->rt6i_src.addr, | |
966 | &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len); | |
967 | rt->rt6i_src.plen = rtmsg->rtmsg_src_len; | |
968 | #endif | |
969 | ||
970 | rt->rt6i_metric = rtmsg->rtmsg_metric; | |
971 | ||
972 | /* We cannot add true routes via loopback here, | |
973 | they would result in kernel looping; promote them to reject routes | |
974 | */ | |
975 | if ((rtmsg->rtmsg_flags&RTF_REJECT) || | |
976 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { | |
977 | /* hold loopback dev/idev if we haven't done so. */ | |
978 | if (dev != &loopback_dev) { | |
979 | if (dev) { | |
980 | dev_put(dev); | |
981 | in6_dev_put(idev); | |
982 | } | |
983 | dev = &loopback_dev; | |
984 | dev_hold(dev); | |
985 | idev = in6_dev_get(dev); | |
986 | if (!idev) { | |
987 | err = -ENODEV; | |
988 | goto out; | |
989 | } | |
990 | } | |
991 | rt->u.dst.output = ip6_pkt_discard_out; | |
992 | rt->u.dst.input = ip6_pkt_discard; | |
993 | rt->u.dst.error = -ENETUNREACH; | |
994 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
995 | goto install_route; | |
996 | } | |
997 | ||
998 | if (rtmsg->rtmsg_flags & RTF_GATEWAY) { | |
999 | struct in6_addr *gw_addr; | |
1000 | int gwa_type; | |
1001 | ||
1002 | gw_addr = &rtmsg->rtmsg_gateway; | |
1003 | ipv6_addr_copy(&rt->rt6i_gateway, &rtmsg->rtmsg_gateway); | |
1004 | gwa_type = ipv6_addr_type(gw_addr); | |
1005 | ||
1006 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1007 | struct rt6_info *grt; | |
1008 | ||
1009 | /* IPv6 strictly inhibits using not link-local | |
1010 | addresses as nexthop address. | |
1011 | Otherwise, router will not able to send redirects. | |
1012 | It is very good, but in some (rare!) circumstances | |
1013 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1014 | some exceptions. --ANK | |
1015 | */ | |
1016 | err = -EINVAL; | |
1017 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1018 | goto out; | |
1019 | ||
1020 | grt = rt6_lookup(gw_addr, NULL, rtmsg->rtmsg_ifindex, 1); | |
1021 | ||
1022 | err = -EHOSTUNREACH; | |
1023 | if (grt == NULL) | |
1024 | goto out; | |
1025 | if (dev) { | |
1026 | if (dev != grt->rt6i_dev) { | |
1027 | dst_release(&grt->u.dst); | |
1028 | goto out; | |
1029 | } | |
1030 | } else { | |
1031 | dev = grt->rt6i_dev; | |
1032 | idev = grt->rt6i_idev; | |
1033 | dev_hold(dev); | |
1034 | in6_dev_hold(grt->rt6i_idev); | |
1035 | } | |
1036 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1037 | err = 0; | |
1038 | dst_release(&grt->u.dst); | |
1039 | ||
1040 | if (err) | |
1041 | goto out; | |
1042 | } | |
1043 | err = -EINVAL; | |
1044 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1045 | goto out; | |
1046 | } | |
1047 | ||
1048 | err = -ENODEV; | |
1049 | if (dev == NULL) | |
1050 | goto out; | |
1051 | ||
1052 | if (rtmsg->rtmsg_flags & (RTF_GATEWAY|RTF_NONEXTHOP)) { | |
1053 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); | |
1054 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1055 | err = PTR_ERR(rt->rt6i_nexthop); | |
1056 | rt->rt6i_nexthop = NULL; | |
1057 | goto out; | |
1058 | } | |
1059 | } | |
1060 | ||
1061 | rt->rt6i_flags = rtmsg->rtmsg_flags; | |
1062 | ||
1063 | install_route: | |
1064 | if (rta && rta[RTA_METRICS-1]) { | |
1065 | int attrlen = RTA_PAYLOAD(rta[RTA_METRICS-1]); | |
1066 | struct rtattr *attr = RTA_DATA(rta[RTA_METRICS-1]); | |
1067 | ||
1068 | while (RTA_OK(attr, attrlen)) { | |
1069 | unsigned flavor = attr->rta_type; | |
1070 | if (flavor) { | |
1071 | if (flavor > RTAX_MAX) { | |
1072 | err = -EINVAL; | |
1073 | goto out; | |
1074 | } | |
1075 | rt->u.dst.metrics[flavor-1] = | |
1076 | *(u32 *)RTA_DATA(attr); | |
1077 | } | |
1078 | attr = RTA_NEXT(attr, attrlen); | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1083 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1084 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1085 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1086 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1087 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1088 | rt->u.dst.dev = dev; | |
1089 | rt->rt6i_idev = idev; | |
0d51aa80 | 1090 | return ip6_ins_rt(rt, nlh, _rtattr, req); |
1da177e4 LT |
1091 | |
1092 | out: | |
1093 | if (dev) | |
1094 | dev_put(dev); | |
1095 | if (idev) | |
1096 | in6_dev_put(idev); | |
1097 | if (rt) | |
1098 | dst_free((struct dst_entry *) rt); | |
1099 | return err; | |
1100 | } | |
1101 | ||
0d51aa80 | 1102 | int ip6_del_rt(struct rt6_info *rt, struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req) |
1da177e4 LT |
1103 | { |
1104 | int err; | |
1105 | ||
1106 | write_lock_bh(&rt6_lock); | |
1107 | ||
0d51aa80 | 1108 | err = fib6_del(rt, nlh, _rtattr, req); |
1da177e4 LT |
1109 | dst_release(&rt->u.dst); |
1110 | ||
1111 | write_unlock_bh(&rt6_lock); | |
1112 | ||
1113 | return err; | |
1114 | } | |
1115 | ||
0d51aa80 | 1116 | static int ip6_route_del(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req) |
1da177e4 LT |
1117 | { |
1118 | struct fib6_node *fn; | |
1119 | struct rt6_info *rt; | |
1120 | int err = -ESRCH; | |
1121 | ||
1122 | read_lock_bh(&rt6_lock); | |
1123 | ||
1124 | fn = fib6_locate(&ip6_routing_table, | |
1125 | &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len, | |
1126 | &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len); | |
1127 | ||
1128 | if (fn) { | |
1129 | for (rt = fn->leaf; rt; rt = rt->u.next) { | |
1130 | if (rtmsg->rtmsg_ifindex && | |
1131 | (rt->rt6i_dev == NULL || | |
1132 | rt->rt6i_dev->ifindex != rtmsg->rtmsg_ifindex)) | |
1133 | continue; | |
1134 | if (rtmsg->rtmsg_flags&RTF_GATEWAY && | |
1135 | !ipv6_addr_equal(&rtmsg->rtmsg_gateway, &rt->rt6i_gateway)) | |
1136 | continue; | |
1137 | if (rtmsg->rtmsg_metric && | |
1138 | rtmsg->rtmsg_metric != rt->rt6i_metric) | |
1139 | continue; | |
1140 | dst_hold(&rt->u.dst); | |
1141 | read_unlock_bh(&rt6_lock); | |
1142 | ||
0d51aa80 | 1143 | return ip6_del_rt(rt, nlh, _rtattr, req); |
1da177e4 LT |
1144 | } |
1145 | } | |
1146 | read_unlock_bh(&rt6_lock); | |
1147 | ||
1148 | return err; | |
1149 | } | |
1150 | ||
1151 | /* | |
1152 | * Handle redirects | |
1153 | */ | |
1154 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *saddr, | |
1155 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1156 | { | |
e843b9e1 YH |
1157 | struct rt6_info *rt, *nrt = NULL; |
1158 | int strict; | |
1159 | struct fib6_node *fn; | |
8d71740c | 1160 | struct netevent_redirect netevent; |
1da177e4 LT |
1161 | |
1162 | /* | |
e843b9e1 YH |
1163 | * Get the "current" route for this destination and |
1164 | * check if the redirect has come from approriate router. | |
1165 | * | |
1166 | * RFC 2461 specifies that redirects should only be | |
1167 | * accepted if they come from the nexthop to the target. | |
1168 | * Due to the way the routes are chosen, this notion | |
1169 | * is a bit fuzzy and one might need to check all possible | |
1170 | * routes. | |
1da177e4 | 1171 | */ |
e843b9e1 | 1172 | strict = ipv6_addr_type(dest) & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL); |
1da177e4 | 1173 | |
e843b9e1 YH |
1174 | read_lock_bh(&rt6_lock); |
1175 | fn = fib6_lookup(&ip6_routing_table, dest, NULL); | |
1176 | restart: | |
1177 | for (rt = fn->leaf; rt; rt = rt->u.next) { | |
1178 | /* | |
1179 | * Current route is on-link; redirect is always invalid. | |
1180 | * | |
1181 | * Seems, previous statement is not true. It could | |
1182 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1183 | * But then router serving it might decide, that we should | |
1184 | * know truth 8)8) --ANK (980726). | |
1185 | */ | |
1186 | if (rt6_check_expired(rt)) | |
1187 | continue; | |
1188 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1189 | continue; | |
1190 | if (neigh->dev != rt->rt6i_dev) | |
1191 | continue; | |
1192 | if (!ipv6_addr_equal(saddr, &rt->rt6i_gateway)) | |
1193 | continue; | |
1194 | break; | |
1195 | } | |
1196 | if (rt) | |
1197 | dst_hold(&rt->u.dst); | |
1198 | else if (strict) { | |
1199 | while ((fn = fn->parent) != NULL) { | |
1200 | if (fn->fn_flags & RTN_ROOT) | |
1201 | break; | |
1202 | if (fn->fn_flags & RTN_RTINFO) | |
1203 | goto restart; | |
1da177e4 | 1204 | } |
e843b9e1 YH |
1205 | } |
1206 | read_unlock_bh(&rt6_lock); | |
1207 | ||
1208 | if (!rt) { | |
1da177e4 LT |
1209 | if (net_ratelimit()) |
1210 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1211 | "for redirect target\n"); | |
e843b9e1 | 1212 | return; |
1da177e4 LT |
1213 | } |
1214 | ||
1da177e4 LT |
1215 | /* |
1216 | * We have finally decided to accept it. | |
1217 | */ | |
1218 | ||
1219 | neigh_update(neigh, lladdr, NUD_STALE, | |
1220 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1221 | NEIGH_UPDATE_F_OVERRIDE| | |
1222 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1223 | NEIGH_UPDATE_F_ISROUTER)) | |
1224 | ); | |
1225 | ||
1226 | /* | |
1227 | * Redirect received -> path was valid. | |
1228 | * Look, redirects are sent only in response to data packets, | |
1229 | * so that this nexthop apparently is reachable. --ANK | |
1230 | */ | |
1231 | dst_confirm(&rt->u.dst); | |
1232 | ||
1233 | /* Duplicate redirect: silently ignore. */ | |
1234 | if (neigh == rt->u.dst.neighbour) | |
1235 | goto out; | |
1236 | ||
1237 | nrt = ip6_rt_copy(rt); | |
1238 | if (nrt == NULL) | |
1239 | goto out; | |
1240 | ||
1241 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1242 | if (on_link) | |
1243 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1244 | ||
1245 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1246 | nrt->rt6i_dst.plen = 128; | |
1247 | nrt->u.dst.flags |= DST_HOST; | |
1248 | ||
1249 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1250 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1251 | /* Reset pmtu, it may be better */ | |
1252 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1253 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1254 | ||
0d51aa80 | 1255 | if (ip6_ins_rt(nrt, NULL, NULL, NULL)) |
1da177e4 LT |
1256 | goto out; |
1257 | ||
8d71740c TT |
1258 | netevent.old = &rt->u.dst; |
1259 | netevent.new = &nrt->u.dst; | |
1260 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1261 | ||
1da177e4 | 1262 | if (rt->rt6i_flags&RTF_CACHE) { |
0d51aa80 | 1263 | ip6_del_rt(rt, NULL, NULL, NULL); |
1da177e4 LT |
1264 | return; |
1265 | } | |
1266 | ||
1267 | out: | |
1268 | dst_release(&rt->u.dst); | |
1269 | return; | |
1270 | } | |
1271 | ||
1272 | /* | |
1273 | * Handle ICMP "packet too big" messages | |
1274 | * i.e. Path MTU discovery | |
1275 | */ | |
1276 | ||
1277 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1278 | struct net_device *dev, u32 pmtu) | |
1279 | { | |
1280 | struct rt6_info *rt, *nrt; | |
1281 | int allfrag = 0; | |
1282 | ||
1283 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1284 | if (rt == NULL) | |
1285 | return; | |
1286 | ||
1287 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1288 | goto out; | |
1289 | ||
1290 | if (pmtu < IPV6_MIN_MTU) { | |
1291 | /* | |
1292 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link | |
1293 | * MTU (1280) and a fragment header should always be included | |
1294 | * after a node receiving Too Big message reporting PMTU is | |
1295 | * less than the IPv6 Minimum Link MTU. | |
1296 | */ | |
1297 | pmtu = IPV6_MIN_MTU; | |
1298 | allfrag = 1; | |
1299 | } | |
1300 | ||
1301 | /* New mtu received -> path was valid. | |
1302 | They are sent only in response to data packets, | |
1303 | so that this nexthop apparently is reachable. --ANK | |
1304 | */ | |
1305 | dst_confirm(&rt->u.dst); | |
1306 | ||
1307 | /* Host route. If it is static, it would be better | |
1308 | not to override it, but add new one, so that | |
1309 | when cache entry will expire old pmtu | |
1310 | would return automatically. | |
1311 | */ | |
1312 | if (rt->rt6i_flags & RTF_CACHE) { | |
1313 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1314 | if (allfrag) | |
1315 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1316 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); | |
1317 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; | |
1318 | goto out; | |
1319 | } | |
1320 | ||
1321 | /* Network route. | |
1322 | Two cases are possible: | |
1323 | 1. It is connected route. Action: COW | |
1324 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1325 | */ | |
d5315b50 | 1326 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1327 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1328 | else |
1329 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1330 | |
d5315b50 | 1331 | if (nrt) { |
a1e78363 YH |
1332 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1333 | if (allfrag) | |
1334 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1335 | ||
1336 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1337 | * happened within 5 mins, the recommended timer is 10 mins. | |
1338 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1339 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1340 | * and detecting PMTU increase will be automatically happened. | |
1341 | */ | |
1342 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); | |
1343 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; | |
1344 | ||
1345 | ip6_ins_rt(nrt, NULL, NULL, NULL); | |
1da177e4 | 1346 | } |
1da177e4 LT |
1347 | out: |
1348 | dst_release(&rt->u.dst); | |
1349 | } | |
1350 | ||
1351 | /* | |
1352 | * Misc support functions | |
1353 | */ | |
1354 | ||
1355 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1356 | { | |
1357 | struct rt6_info *rt = ip6_dst_alloc(); | |
1358 | ||
1359 | if (rt) { | |
1360 | rt->u.dst.input = ort->u.dst.input; | |
1361 | rt->u.dst.output = ort->u.dst.output; | |
1362 | ||
1363 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
1364 | rt->u.dst.dev = ort->u.dst.dev; | |
1365 | if (rt->u.dst.dev) | |
1366 | dev_hold(rt->u.dst.dev); | |
1367 | rt->rt6i_idev = ort->rt6i_idev; | |
1368 | if (rt->rt6i_idev) | |
1369 | in6_dev_hold(rt->rt6i_idev); | |
1370 | rt->u.dst.lastuse = jiffies; | |
1371 | rt->rt6i_expires = 0; | |
1372 | ||
1373 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1374 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1375 | rt->rt6i_metric = 0; | |
1376 | ||
1377 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1378 | #ifdef CONFIG_IPV6_SUBTREES | |
1379 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1380 | #endif | |
1381 | } | |
1382 | return rt; | |
1383 | } | |
1384 | ||
70ceb4f5 YH |
1385 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1386 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1387 | struct in6_addr *gwaddr, int ifindex) | |
1388 | { | |
1389 | struct fib6_node *fn; | |
1390 | struct rt6_info *rt = NULL; | |
1391 | ||
1392 | write_lock_bh(&rt6_lock); | |
1393 | fn = fib6_locate(&ip6_routing_table, prefix ,prefixlen, NULL, 0); | |
1394 | if (!fn) | |
1395 | goto out; | |
1396 | ||
1397 | for (rt = fn->leaf; rt; rt = rt->u.next) { | |
1398 | if (rt->rt6i_dev->ifindex != ifindex) | |
1399 | continue; | |
1400 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1401 | continue; | |
1402 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1403 | continue; | |
1404 | dst_hold(&rt->u.dst); | |
1405 | break; | |
1406 | } | |
1407 | out: | |
1408 | write_unlock_bh(&rt6_lock); | |
1409 | return rt; | |
1410 | } | |
1411 | ||
1412 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1413 | struct in6_addr *gwaddr, int ifindex, | |
1414 | unsigned pref) | |
1415 | { | |
1416 | struct in6_rtmsg rtmsg; | |
1417 | ||
1418 | memset(&rtmsg, 0, sizeof(rtmsg)); | |
1419 | rtmsg.rtmsg_type = RTMSG_NEWROUTE; | |
1420 | ipv6_addr_copy(&rtmsg.rtmsg_dst, prefix); | |
1421 | rtmsg.rtmsg_dst_len = prefixlen; | |
1422 | ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr); | |
1423 | rtmsg.rtmsg_metric = 1024; | |
1424 | rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | RTF_UP | RTF_PREF(pref); | |
e317da96 YH |
1425 | /* We should treat it as a default route if prefix length is 0. */ |
1426 | if (!prefixlen) | |
1427 | rtmsg.rtmsg_flags |= RTF_DEFAULT; | |
70ceb4f5 YH |
1428 | rtmsg.rtmsg_ifindex = ifindex; |
1429 | ||
1430 | ip6_route_add(&rtmsg, NULL, NULL, NULL); | |
1431 | ||
1432 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1433 | } | |
1434 | #endif | |
1435 | ||
1da177e4 LT |
1436 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1437 | { | |
1438 | struct rt6_info *rt; | |
1439 | struct fib6_node *fn; | |
1440 | ||
1441 | fn = &ip6_routing_table; | |
1442 | ||
1443 | write_lock_bh(&rt6_lock); | |
1444 | for (rt = fn->leaf; rt; rt=rt->u.next) { | |
1445 | if (dev == rt->rt6i_dev && | |
045927ff | 1446 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1447 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1448 | break; | |
1449 | } | |
1450 | if (rt) | |
1451 | dst_hold(&rt->u.dst); | |
1452 | write_unlock_bh(&rt6_lock); | |
1453 | return rt; | |
1454 | } | |
1455 | ||
1456 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1457 | struct net_device *dev, |
1458 | unsigned int pref) | |
1da177e4 LT |
1459 | { |
1460 | struct in6_rtmsg rtmsg; | |
1461 | ||
1462 | memset(&rtmsg, 0, sizeof(struct in6_rtmsg)); | |
1463 | rtmsg.rtmsg_type = RTMSG_NEWROUTE; | |
1464 | ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr); | |
1465 | rtmsg.rtmsg_metric = 1024; | |
ebacaaa0 YH |
1466 | rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | RTF_UP | RTF_EXPIRES | |
1467 | RTF_PREF(pref); | |
1da177e4 LT |
1468 | |
1469 | rtmsg.rtmsg_ifindex = dev->ifindex; | |
1470 | ||
0d51aa80 | 1471 | ip6_route_add(&rtmsg, NULL, NULL, NULL); |
1da177e4 LT |
1472 | return rt6_get_dflt_router(gwaddr, dev); |
1473 | } | |
1474 | ||
1475 | void rt6_purge_dflt_routers(void) | |
1476 | { | |
1477 | struct rt6_info *rt; | |
1478 | ||
1479 | restart: | |
1480 | read_lock_bh(&rt6_lock); | |
1481 | for (rt = ip6_routing_table.leaf; rt; rt = rt->u.next) { | |
1482 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { | |
1483 | dst_hold(&rt->u.dst); | |
1484 | ||
1da177e4 LT |
1485 | read_unlock_bh(&rt6_lock); |
1486 | ||
0d51aa80 | 1487 | ip6_del_rt(rt, NULL, NULL, NULL); |
1da177e4 LT |
1488 | |
1489 | goto restart; | |
1490 | } | |
1491 | } | |
1492 | read_unlock_bh(&rt6_lock); | |
1493 | } | |
1494 | ||
1495 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) | |
1496 | { | |
1497 | struct in6_rtmsg rtmsg; | |
1498 | int err; | |
1499 | ||
1500 | switch(cmd) { | |
1501 | case SIOCADDRT: /* Add a route */ | |
1502 | case SIOCDELRT: /* Delete a route */ | |
1503 | if (!capable(CAP_NET_ADMIN)) | |
1504 | return -EPERM; | |
1505 | err = copy_from_user(&rtmsg, arg, | |
1506 | sizeof(struct in6_rtmsg)); | |
1507 | if (err) | |
1508 | return -EFAULT; | |
1509 | ||
1510 | rtnl_lock(); | |
1511 | switch (cmd) { | |
1512 | case SIOCADDRT: | |
0d51aa80 | 1513 | err = ip6_route_add(&rtmsg, NULL, NULL, NULL); |
1da177e4 LT |
1514 | break; |
1515 | case SIOCDELRT: | |
0d51aa80 | 1516 | err = ip6_route_del(&rtmsg, NULL, NULL, NULL); |
1da177e4 LT |
1517 | break; |
1518 | default: | |
1519 | err = -EINVAL; | |
1520 | } | |
1521 | rtnl_unlock(); | |
1522 | ||
1523 | return err; | |
1524 | }; | |
1525 | ||
1526 | return -EINVAL; | |
1527 | } | |
1528 | ||
1529 | /* | |
1530 | * Drop the packet on the floor | |
1531 | */ | |
1532 | ||
20380731 | 1533 | static int ip6_pkt_discard(struct sk_buff *skb) |
1da177e4 | 1534 | { |
76d0cc1b LL |
1535 | int type = ipv6_addr_type(&skb->nh.ipv6h->daddr); |
1536 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) | |
1537 | IP6_INC_STATS(IPSTATS_MIB_INADDRERRORS); | |
1538 | ||
1da177e4 LT |
1539 | IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES); |
1540 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev); | |
1541 | kfree_skb(skb); | |
1542 | return 0; | |
1543 | } | |
1544 | ||
20380731 | 1545 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1546 | { |
1547 | skb->dev = skb->dst->dev; | |
1548 | return ip6_pkt_discard(skb); | |
1549 | } | |
1550 | ||
1551 | /* | |
1552 | * Allocate a dst for local (unicast / anycast) address. | |
1553 | */ | |
1554 | ||
1555 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1556 | const struct in6_addr *addr, | |
1557 | int anycast) | |
1558 | { | |
1559 | struct rt6_info *rt = ip6_dst_alloc(); | |
1560 | ||
1561 | if (rt == NULL) | |
1562 | return ERR_PTR(-ENOMEM); | |
1563 | ||
1564 | dev_hold(&loopback_dev); | |
1565 | in6_dev_hold(idev); | |
1566 | ||
1567 | rt->u.dst.flags = DST_HOST; | |
1568 | rt->u.dst.input = ip6_input; | |
1569 | rt->u.dst.output = ip6_output; | |
1570 | rt->rt6i_dev = &loopback_dev; | |
1571 | rt->rt6i_idev = idev; | |
1572 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1573 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1574 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1575 | rt->u.dst.obsolete = -1; | |
1576 | ||
1577 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1578 | if (anycast) |
1579 | rt->rt6i_flags |= RTF_ANYCAST; | |
1580 | else | |
1da177e4 LT |
1581 | rt->rt6i_flags |= RTF_LOCAL; |
1582 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1583 | if (rt->rt6i_nexthop == NULL) { | |
1584 | dst_free((struct dst_entry *) rt); | |
1585 | return ERR_PTR(-ENOMEM); | |
1586 | } | |
1587 | ||
1588 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1589 | rt->rt6i_dst.plen = 128; | |
1590 | ||
1591 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1592 | ||
1593 | return rt; | |
1594 | } | |
1595 | ||
1596 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1597 | { | |
1598 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1599 | rt != &ip6_null_entry) { | |
1600 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1601 | return -1; | |
1602 | } | |
1603 | return 0; | |
1604 | } | |
1605 | ||
1606 | void rt6_ifdown(struct net_device *dev) | |
1607 | { | |
1608 | write_lock_bh(&rt6_lock); | |
1609 | fib6_clean_tree(&ip6_routing_table, fib6_ifdown, 0, dev); | |
1610 | write_unlock_bh(&rt6_lock); | |
1611 | } | |
1612 | ||
1613 | struct rt6_mtu_change_arg | |
1614 | { | |
1615 | struct net_device *dev; | |
1616 | unsigned mtu; | |
1617 | }; | |
1618 | ||
1619 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1620 | { | |
1621 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1622 | struct inet6_dev *idev; | |
1623 | ||
1624 | /* In IPv6 pmtu discovery is not optional, | |
1625 | so that RTAX_MTU lock cannot disable it. | |
1626 | We still use this lock to block changes | |
1627 | caused by addrconf/ndisc. | |
1628 | */ | |
1629 | ||
1630 | idev = __in6_dev_get(arg->dev); | |
1631 | if (idev == NULL) | |
1632 | return 0; | |
1633 | ||
1634 | /* For administrative MTU increase, there is no way to discover | |
1635 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1636 | Since RFC 1981 doesn't include administrative MTU increase | |
1637 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1638 | */ | |
1639 | /* | |
1640 | If new MTU is less than route PMTU, this new MTU will be the | |
1641 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1642 | decreases; if new MTU is greater than route PMTU, and the | |
1643 | old MTU is the lowest MTU in the path, update the route PMTU | |
1644 | to reflect the increase. In this case if the other nodes' MTU | |
1645 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1646 | PMTU discouvery. | |
1647 | */ | |
1648 | if (rt->rt6i_dev == arg->dev && | |
1649 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
1650 | (dst_mtu(&rt->u.dst) > arg->mtu || | |
1651 | (dst_mtu(&rt->u.dst) < arg->mtu && | |
1652 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) | |
1653 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; | |
1654 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); | |
1655 | return 0; | |
1656 | } | |
1657 | ||
1658 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1659 | { | |
1660 | struct rt6_mtu_change_arg arg; | |
1661 | ||
1662 | arg.dev = dev; | |
1663 | arg.mtu = mtu; | |
1664 | read_lock_bh(&rt6_lock); | |
1665 | fib6_clean_tree(&ip6_routing_table, rt6_mtu_change_route, 0, &arg); | |
1666 | read_unlock_bh(&rt6_lock); | |
1667 | } | |
1668 | ||
1669 | static int inet6_rtm_to_rtmsg(struct rtmsg *r, struct rtattr **rta, | |
1670 | struct in6_rtmsg *rtmsg) | |
1671 | { | |
1672 | memset(rtmsg, 0, sizeof(*rtmsg)); | |
1673 | ||
1674 | rtmsg->rtmsg_dst_len = r->rtm_dst_len; | |
1675 | rtmsg->rtmsg_src_len = r->rtm_src_len; | |
1676 | rtmsg->rtmsg_flags = RTF_UP; | |
1677 | if (r->rtm_type == RTN_UNREACHABLE) | |
1678 | rtmsg->rtmsg_flags |= RTF_REJECT; | |
1679 | ||
1680 | if (rta[RTA_GATEWAY-1]) { | |
1681 | if (rta[RTA_GATEWAY-1]->rta_len != RTA_LENGTH(16)) | |
1682 | return -EINVAL; | |
1683 | memcpy(&rtmsg->rtmsg_gateway, RTA_DATA(rta[RTA_GATEWAY-1]), 16); | |
1684 | rtmsg->rtmsg_flags |= RTF_GATEWAY; | |
1685 | } | |
1686 | if (rta[RTA_DST-1]) { | |
1687 | if (RTA_PAYLOAD(rta[RTA_DST-1]) < ((r->rtm_dst_len+7)>>3)) | |
1688 | return -EINVAL; | |
1689 | memcpy(&rtmsg->rtmsg_dst, RTA_DATA(rta[RTA_DST-1]), ((r->rtm_dst_len+7)>>3)); | |
1690 | } | |
1691 | if (rta[RTA_SRC-1]) { | |
1692 | if (RTA_PAYLOAD(rta[RTA_SRC-1]) < ((r->rtm_src_len+7)>>3)) | |
1693 | return -EINVAL; | |
1694 | memcpy(&rtmsg->rtmsg_src, RTA_DATA(rta[RTA_SRC-1]), ((r->rtm_src_len+7)>>3)); | |
1695 | } | |
1696 | if (rta[RTA_OIF-1]) { | |
1697 | if (rta[RTA_OIF-1]->rta_len != RTA_LENGTH(sizeof(int))) | |
1698 | return -EINVAL; | |
1699 | memcpy(&rtmsg->rtmsg_ifindex, RTA_DATA(rta[RTA_OIF-1]), sizeof(int)); | |
1700 | } | |
1701 | if (rta[RTA_PRIORITY-1]) { | |
1702 | if (rta[RTA_PRIORITY-1]->rta_len != RTA_LENGTH(4)) | |
1703 | return -EINVAL; | |
1704 | memcpy(&rtmsg->rtmsg_metric, RTA_DATA(rta[RTA_PRIORITY-1]), 4); | |
1705 | } | |
1706 | return 0; | |
1707 | } | |
1708 | ||
1709 | int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
1710 | { | |
1711 | struct rtmsg *r = NLMSG_DATA(nlh); | |
1712 | struct in6_rtmsg rtmsg; | |
1713 | ||
1714 | if (inet6_rtm_to_rtmsg(r, arg, &rtmsg)) | |
1715 | return -EINVAL; | |
0d51aa80 | 1716 | return ip6_route_del(&rtmsg, nlh, arg, &NETLINK_CB(skb)); |
1da177e4 LT |
1717 | } |
1718 | ||
1719 | int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
1720 | { | |
1721 | struct rtmsg *r = NLMSG_DATA(nlh); | |
1722 | struct in6_rtmsg rtmsg; | |
1723 | ||
1724 | if (inet6_rtm_to_rtmsg(r, arg, &rtmsg)) | |
1725 | return -EINVAL; | |
0d51aa80 | 1726 | return ip6_route_add(&rtmsg, nlh, arg, &NETLINK_CB(skb)); |
1da177e4 LT |
1727 | } |
1728 | ||
1729 | struct rt6_rtnl_dump_arg | |
1730 | { | |
1731 | struct sk_buff *skb; | |
1732 | struct netlink_callback *cb; | |
1733 | }; | |
1734 | ||
1735 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
1736 | struct in6_addr *dst, struct in6_addr *src, |
1737 | int iif, int type, u32 pid, u32 seq, | |
1738 | int prefix, unsigned int flags) | |
1da177e4 LT |
1739 | { |
1740 | struct rtmsg *rtm; | |
1741 | struct nlmsghdr *nlh; | |
1742 | unsigned char *b = skb->tail; | |
1743 | struct rta_cacheinfo ci; | |
1744 | ||
1745 | if (prefix) { /* user wants prefix routes only */ | |
1746 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
1747 | /* success since this is not a prefix route */ | |
1748 | return 1; | |
1749 | } | |
1750 | } | |
1751 | ||
b6544c0b | 1752 | nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*rtm), flags); |
1da177e4 LT |
1753 | rtm = NLMSG_DATA(nlh); |
1754 | rtm->rtm_family = AF_INET6; | |
1755 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
1756 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
1757 | rtm->rtm_tos = 0; | |
1758 | rtm->rtm_table = RT_TABLE_MAIN; | |
1759 | if (rt->rt6i_flags&RTF_REJECT) | |
1760 | rtm->rtm_type = RTN_UNREACHABLE; | |
1761 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
1762 | rtm->rtm_type = RTN_LOCAL; | |
1763 | else | |
1764 | rtm->rtm_type = RTN_UNICAST; | |
1765 | rtm->rtm_flags = 0; | |
1766 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
1767 | rtm->rtm_protocol = rt->rt6i_protocol; | |
1768 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
1769 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
1770 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
1771 | rtm->rtm_protocol = RTPROT_KERNEL; | |
1772 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
1773 | rtm->rtm_protocol = RTPROT_RA; | |
1774 | ||
1775 | if (rt->rt6i_flags&RTF_CACHE) | |
1776 | rtm->rtm_flags |= RTM_F_CLONED; | |
1777 | ||
1778 | if (dst) { | |
1779 | RTA_PUT(skb, RTA_DST, 16, dst); | |
1780 | rtm->rtm_dst_len = 128; | |
1781 | } else if (rtm->rtm_dst_len) | |
1782 | RTA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); | |
1783 | #ifdef CONFIG_IPV6_SUBTREES | |
1784 | if (src) { | |
1785 | RTA_PUT(skb, RTA_SRC, 16, src); | |
1786 | rtm->rtm_src_len = 128; | |
1787 | } else if (rtm->rtm_src_len) | |
1788 | RTA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); | |
1789 | #endif | |
1790 | if (iif) | |
1791 | RTA_PUT(skb, RTA_IIF, 4, &iif); | |
1792 | else if (dst) { | |
1793 | struct in6_addr saddr_buf; | |
1794 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) | |
1795 | RTA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); | |
1796 | } | |
1797 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) | |
1798 | goto rtattr_failure; | |
1799 | if (rt->u.dst.neighbour) | |
1800 | RTA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); | |
1801 | if (rt->u.dst.dev) | |
1802 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->rt6i_dev->ifindex); | |
1803 | RTA_PUT(skb, RTA_PRIORITY, 4, &rt->rt6i_metric); | |
1804 | ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse); | |
1805 | if (rt->rt6i_expires) | |
1806 | ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies); | |
1807 | else | |
1808 | ci.rta_expires = 0; | |
1809 | ci.rta_used = rt->u.dst.__use; | |
1810 | ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt); | |
1811 | ci.rta_error = rt->u.dst.error; | |
1812 | ci.rta_id = 0; | |
1813 | ci.rta_ts = 0; | |
1814 | ci.rta_tsage = 0; | |
1815 | RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci); | |
1816 | nlh->nlmsg_len = skb->tail - b; | |
1817 | return skb->len; | |
1818 | ||
1819 | nlmsg_failure: | |
1820 | rtattr_failure: | |
1821 | skb_trim(skb, b - skb->data); | |
1822 | return -1; | |
1823 | } | |
1824 | ||
1825 | static int rt6_dump_route(struct rt6_info *rt, void *p_arg) | |
1826 | { | |
1827 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
1828 | int prefix; | |
1829 | ||
1830 | if (arg->cb->nlh->nlmsg_len >= NLMSG_LENGTH(sizeof(struct rtmsg))) { | |
1831 | struct rtmsg *rtm = NLMSG_DATA(arg->cb->nlh); | |
1832 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; | |
1833 | } else | |
1834 | prefix = 0; | |
1835 | ||
1836 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1837 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 1838 | prefix, NLM_F_MULTI); |
1da177e4 LT |
1839 | } |
1840 | ||
1841 | static int fib6_dump_node(struct fib6_walker_t *w) | |
1842 | { | |
1843 | int res; | |
1844 | struct rt6_info *rt; | |
1845 | ||
1846 | for (rt = w->leaf; rt; rt = rt->u.next) { | |
1847 | res = rt6_dump_route(rt, w->args); | |
1848 | if (res < 0) { | |
1849 | /* Frame is full, suspend walking */ | |
1850 | w->leaf = rt; | |
1851 | return 1; | |
1852 | } | |
1853 | BUG_TRAP(res!=0); | |
1854 | } | |
1855 | w->leaf = NULL; | |
1856 | return 0; | |
1857 | } | |
1858 | ||
1859 | static void fib6_dump_end(struct netlink_callback *cb) | |
1860 | { | |
1861 | struct fib6_walker_t *w = (void*)cb->args[0]; | |
1862 | ||
1863 | if (w) { | |
1864 | cb->args[0] = 0; | |
1865 | fib6_walker_unlink(w); | |
1866 | kfree(w); | |
1867 | } | |
efacfbcb HX |
1868 | cb->done = (void*)cb->args[1]; |
1869 | cb->args[1] = 0; | |
1da177e4 LT |
1870 | } |
1871 | ||
1872 | static int fib6_dump_done(struct netlink_callback *cb) | |
1873 | { | |
1874 | fib6_dump_end(cb); | |
a8f74b22 | 1875 | return cb->done ? cb->done(cb) : 0; |
1da177e4 LT |
1876 | } |
1877 | ||
1878 | int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) | |
1879 | { | |
1880 | struct rt6_rtnl_dump_arg arg; | |
1881 | struct fib6_walker_t *w; | |
1882 | int res; | |
1883 | ||
1884 | arg.skb = skb; | |
1885 | arg.cb = cb; | |
1886 | ||
1887 | w = (void*)cb->args[0]; | |
1888 | if (w == NULL) { | |
1889 | /* New dump: | |
1890 | * | |
1891 | * 1. hook callback destructor. | |
1892 | */ | |
1893 | cb->args[1] = (long)cb->done; | |
1894 | cb->done = fib6_dump_done; | |
1895 | ||
1896 | /* | |
1897 | * 2. allocate and initialize walker. | |
1898 | */ | |
0c600eda | 1899 | w = kzalloc(sizeof(*w), GFP_ATOMIC); |
1da177e4 LT |
1900 | if (w == NULL) |
1901 | return -ENOMEM; | |
1902 | RT6_TRACE("dump<%p", w); | |
1da177e4 LT |
1903 | w->root = &ip6_routing_table; |
1904 | w->func = fib6_dump_node; | |
1905 | w->args = &arg; | |
1906 | cb->args[0] = (long)w; | |
1907 | read_lock_bh(&rt6_lock); | |
1908 | res = fib6_walk(w); | |
1909 | read_unlock_bh(&rt6_lock); | |
1910 | } else { | |
1911 | w->args = &arg; | |
1912 | read_lock_bh(&rt6_lock); | |
1913 | res = fib6_walk_continue(w); | |
1914 | read_unlock_bh(&rt6_lock); | |
1915 | } | |
1916 | #if RT6_DEBUG >= 3 | |
1917 | if (res <= 0 && skb->len == 0) | |
1918 | RT6_TRACE("%p>dump end\n", w); | |
1919 | #endif | |
1920 | res = res < 0 ? res : skb->len; | |
1921 | /* res < 0 is an error. (really, impossible) | |
1922 | res == 0 means that dump is complete, but skb still can contain data. | |
1923 | res > 0 dump is not complete, but frame is full. | |
1924 | */ | |
1925 | /* Destroy walker, if dump of this table is complete. */ | |
1926 | if (res <= 0) | |
1927 | fib6_dump_end(cb); | |
1928 | return res; | |
1929 | } | |
1930 | ||
1931 | int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) | |
1932 | { | |
1933 | struct rtattr **rta = arg; | |
1934 | int iif = 0; | |
1935 | int err = -ENOBUFS; | |
1936 | struct sk_buff *skb; | |
1937 | struct flowi fl; | |
1938 | struct rt6_info *rt; | |
1939 | ||
1940 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1941 | if (skb == NULL) | |
1942 | goto out; | |
1943 | ||
1944 | /* Reserve room for dummy headers, this skb can pass | |
1945 | through good chunk of routing engine. | |
1946 | */ | |
1947 | skb->mac.raw = skb->data; | |
1948 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); | |
1949 | ||
1950 | memset(&fl, 0, sizeof(fl)); | |
1951 | if (rta[RTA_SRC-1]) | |
1952 | ipv6_addr_copy(&fl.fl6_src, | |
1953 | (struct in6_addr*)RTA_DATA(rta[RTA_SRC-1])); | |
1954 | if (rta[RTA_DST-1]) | |
1955 | ipv6_addr_copy(&fl.fl6_dst, | |
1956 | (struct in6_addr*)RTA_DATA(rta[RTA_DST-1])); | |
1957 | ||
1958 | if (rta[RTA_IIF-1]) | |
1959 | memcpy(&iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); | |
1960 | ||
1961 | if (iif) { | |
1962 | struct net_device *dev; | |
1963 | dev = __dev_get_by_index(iif); | |
1964 | if (!dev) { | |
1965 | err = -ENODEV; | |
1966 | goto out_free; | |
1967 | } | |
1968 | } | |
1969 | ||
1970 | fl.oif = 0; | |
1971 | if (rta[RTA_OIF-1]) | |
1972 | memcpy(&fl.oif, RTA_DATA(rta[RTA_OIF-1]), sizeof(int)); | |
1973 | ||
1974 | rt = (struct rt6_info*)ip6_route_output(NULL, &fl); | |
1975 | ||
1976 | skb->dst = &rt->u.dst; | |
1977 | ||
1978 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; | |
1979 | err = rt6_fill_node(skb, rt, | |
1980 | &fl.fl6_dst, &fl.fl6_src, | |
1981 | iif, | |
1982 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, | |
0d51aa80 | 1983 | nlh->nlmsg_seq, 0, 0); |
1da177e4 LT |
1984 | if (err < 0) { |
1985 | err = -EMSGSIZE; | |
1986 | goto out_free; | |
1987 | } | |
1988 | ||
1989 | err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); | |
1990 | if (err > 0) | |
1991 | err = 0; | |
1992 | out: | |
1993 | return err; | |
1994 | out_free: | |
1995 | kfree_skb(skb); | |
1996 | goto out; | |
1997 | } | |
1998 | ||
0d51aa80 JHS |
1999 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nlmsghdr *nlh, |
2000 | struct netlink_skb_parms *req) | |
1da177e4 LT |
2001 | { |
2002 | struct sk_buff *skb; | |
2003 | int size = NLMSG_SPACE(sizeof(struct rtmsg)+256); | |
0d51aa80 JHS |
2004 | u32 pid = current->pid; |
2005 | u32 seq = 0; | |
1da177e4 | 2006 | |
0d51aa80 JHS |
2007 | if (req) |
2008 | pid = req->pid; | |
2009 | if (nlh) | |
2010 | seq = nlh->nlmsg_seq; | |
2011 | ||
1da177e4 LT |
2012 | skb = alloc_skb(size, gfp_any()); |
2013 | if (!skb) { | |
ac6d439d | 2014 | netlink_set_err(rtnl, 0, RTNLGRP_IPV6_ROUTE, ENOBUFS); |
1da177e4 LT |
2015 | return; |
2016 | } | |
0d51aa80 | 2017 | if (rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0) < 0) { |
1da177e4 | 2018 | kfree_skb(skb); |
ac6d439d | 2019 | netlink_set_err(rtnl, 0, RTNLGRP_IPV6_ROUTE, EINVAL); |
1da177e4 LT |
2020 | return; |
2021 | } | |
ac6d439d PM |
2022 | NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_ROUTE; |
2023 | netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_ROUTE, gfp_any()); | |
1da177e4 LT |
2024 | } |
2025 | ||
2026 | /* | |
2027 | * /proc | |
2028 | */ | |
2029 | ||
2030 | #ifdef CONFIG_PROC_FS | |
2031 | ||
2032 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2033 | ||
2034 | struct rt6_proc_arg | |
2035 | { | |
2036 | char *buffer; | |
2037 | int offset; | |
2038 | int length; | |
2039 | int skip; | |
2040 | int len; | |
2041 | }; | |
2042 | ||
2043 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2044 | { | |
2045 | struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg; | |
2046 | int i; | |
2047 | ||
2048 | if (arg->skip < arg->offset / RT6_INFO_LEN) { | |
2049 | arg->skip++; | |
2050 | return 0; | |
2051 | } | |
2052 | ||
2053 | if (arg->len >= arg->length) | |
2054 | return 0; | |
2055 | ||
2056 | for (i=0; i<16; i++) { | |
2057 | sprintf(arg->buffer + arg->len, "%02x", | |
2058 | rt->rt6i_dst.addr.s6_addr[i]); | |
2059 | arg->len += 2; | |
2060 | } | |
2061 | arg->len += sprintf(arg->buffer + arg->len, " %02x ", | |
2062 | rt->rt6i_dst.plen); | |
2063 | ||
2064 | #ifdef CONFIG_IPV6_SUBTREES | |
2065 | for (i=0; i<16; i++) { | |
2066 | sprintf(arg->buffer + arg->len, "%02x", | |
2067 | rt->rt6i_src.addr.s6_addr[i]); | |
2068 | arg->len += 2; | |
2069 | } | |
2070 | arg->len += sprintf(arg->buffer + arg->len, " %02x ", | |
2071 | rt->rt6i_src.plen); | |
2072 | #else | |
2073 | sprintf(arg->buffer + arg->len, | |
2074 | "00000000000000000000000000000000 00 "); | |
2075 | arg->len += 36; | |
2076 | #endif | |
2077 | ||
2078 | if (rt->rt6i_nexthop) { | |
2079 | for (i=0; i<16; i++) { | |
2080 | sprintf(arg->buffer + arg->len, "%02x", | |
2081 | rt->rt6i_nexthop->primary_key[i]); | |
2082 | arg->len += 2; | |
2083 | } | |
2084 | } else { | |
2085 | sprintf(arg->buffer + arg->len, | |
2086 | "00000000000000000000000000000000"); | |
2087 | arg->len += 32; | |
2088 | } | |
2089 | arg->len += sprintf(arg->buffer + arg->len, | |
2090 | " %08x %08x %08x %08x %8s\n", | |
2091 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2092 | rt->u.dst.__use, rt->rt6i_flags, | |
2093 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
2094 | return 0; | |
2095 | } | |
2096 | ||
2097 | static int rt6_proc_info(char *buffer, char **start, off_t offset, int length) | |
2098 | { | |
2099 | struct rt6_proc_arg arg; | |
2100 | arg.buffer = buffer; | |
2101 | arg.offset = offset; | |
2102 | arg.length = length; | |
2103 | arg.skip = 0; | |
2104 | arg.len = 0; | |
2105 | ||
2106 | read_lock_bh(&rt6_lock); | |
2107 | fib6_clean_tree(&ip6_routing_table, rt6_info_route, 0, &arg); | |
2108 | read_unlock_bh(&rt6_lock); | |
2109 | ||
2110 | *start = buffer; | |
2111 | if (offset) | |
2112 | *start += offset % RT6_INFO_LEN; | |
2113 | ||
2114 | arg.len -= offset % RT6_INFO_LEN; | |
2115 | ||
2116 | if (arg.len > length) | |
2117 | arg.len = length; | |
2118 | if (arg.len < 0) | |
2119 | arg.len = 0; | |
2120 | ||
2121 | return arg.len; | |
2122 | } | |
2123 | ||
1da177e4 LT |
2124 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2125 | { | |
2126 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
2127 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
2128 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
2129 | rt6_stats.fib_rt_cache, | |
2130 | atomic_read(&ip6_dst_ops.entries), | |
2131 | rt6_stats.fib_discarded_routes); | |
2132 | ||
2133 | return 0; | |
2134 | } | |
2135 | ||
2136 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2137 | { | |
2138 | return single_open(file, rt6_stats_seq_show, NULL); | |
2139 | } | |
2140 | ||
2141 | static struct file_operations rt6_stats_seq_fops = { | |
2142 | .owner = THIS_MODULE, | |
2143 | .open = rt6_stats_seq_open, | |
2144 | .read = seq_read, | |
2145 | .llseek = seq_lseek, | |
2146 | .release = single_release, | |
2147 | }; | |
2148 | #endif /* CONFIG_PROC_FS */ | |
2149 | ||
2150 | #ifdef CONFIG_SYSCTL | |
2151 | ||
2152 | static int flush_delay; | |
2153 | ||
2154 | static | |
2155 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2156 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2157 | { | |
2158 | if (write) { | |
2159 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2160 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); | |
2161 | return 0; | |
2162 | } else | |
2163 | return -EINVAL; | |
2164 | } | |
2165 | ||
2166 | ctl_table ipv6_route_table[] = { | |
2167 | { | |
2168 | .ctl_name = NET_IPV6_ROUTE_FLUSH, | |
2169 | .procname = "flush", | |
2170 | .data = &flush_delay, | |
2171 | .maxlen = sizeof(int), | |
89c8b3a1 | 2172 | .mode = 0200, |
1da177e4 LT |
2173 | .proc_handler = &ipv6_sysctl_rtcache_flush |
2174 | }, | |
2175 | { | |
2176 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2177 | .procname = "gc_thresh", | |
2178 | .data = &ip6_dst_ops.gc_thresh, | |
2179 | .maxlen = sizeof(int), | |
2180 | .mode = 0644, | |
2181 | .proc_handler = &proc_dointvec, | |
2182 | }, | |
2183 | { | |
2184 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2185 | .procname = "max_size", | |
2186 | .data = &ip6_rt_max_size, | |
2187 | .maxlen = sizeof(int), | |
2188 | .mode = 0644, | |
2189 | .proc_handler = &proc_dointvec, | |
2190 | }, | |
2191 | { | |
2192 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2193 | .procname = "gc_min_interval", | |
2194 | .data = &ip6_rt_gc_min_interval, | |
2195 | .maxlen = sizeof(int), | |
2196 | .mode = 0644, | |
2197 | .proc_handler = &proc_dointvec_jiffies, | |
2198 | .strategy = &sysctl_jiffies, | |
2199 | }, | |
2200 | { | |
2201 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2202 | .procname = "gc_timeout", | |
2203 | .data = &ip6_rt_gc_timeout, | |
2204 | .maxlen = sizeof(int), | |
2205 | .mode = 0644, | |
2206 | .proc_handler = &proc_dointvec_jiffies, | |
2207 | .strategy = &sysctl_jiffies, | |
2208 | }, | |
2209 | { | |
2210 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2211 | .procname = "gc_interval", | |
2212 | .data = &ip6_rt_gc_interval, | |
2213 | .maxlen = sizeof(int), | |
2214 | .mode = 0644, | |
2215 | .proc_handler = &proc_dointvec_jiffies, | |
2216 | .strategy = &sysctl_jiffies, | |
2217 | }, | |
2218 | { | |
2219 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2220 | .procname = "gc_elasticity", | |
2221 | .data = &ip6_rt_gc_elasticity, | |
2222 | .maxlen = sizeof(int), | |
2223 | .mode = 0644, | |
2224 | .proc_handler = &proc_dointvec_jiffies, | |
2225 | .strategy = &sysctl_jiffies, | |
2226 | }, | |
2227 | { | |
2228 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2229 | .procname = "mtu_expires", | |
2230 | .data = &ip6_rt_mtu_expires, | |
2231 | .maxlen = sizeof(int), | |
2232 | .mode = 0644, | |
2233 | .proc_handler = &proc_dointvec_jiffies, | |
2234 | .strategy = &sysctl_jiffies, | |
2235 | }, | |
2236 | { | |
2237 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2238 | .procname = "min_adv_mss", | |
2239 | .data = &ip6_rt_min_advmss, | |
2240 | .maxlen = sizeof(int), | |
2241 | .mode = 0644, | |
2242 | .proc_handler = &proc_dointvec_jiffies, | |
2243 | .strategy = &sysctl_jiffies, | |
2244 | }, | |
2245 | { | |
2246 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2247 | .procname = "gc_min_interval_ms", | |
2248 | .data = &ip6_rt_gc_min_interval, | |
2249 | .maxlen = sizeof(int), | |
2250 | .mode = 0644, | |
2251 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2252 | .strategy = &sysctl_ms_jiffies, | |
2253 | }, | |
2254 | { .ctl_name = 0 } | |
2255 | }; | |
2256 | ||
2257 | #endif | |
2258 | ||
2259 | void __init ip6_route_init(void) | |
2260 | { | |
2261 | struct proc_dir_entry *p; | |
2262 | ||
2263 | ip6_dst_ops.kmem_cachep = kmem_cache_create("ip6_dst_cache", | |
2264 | sizeof(struct rt6_info), | |
2265 | 0, SLAB_HWCACHE_ALIGN, | |
2266 | NULL, NULL); | |
2267 | if (!ip6_dst_ops.kmem_cachep) | |
2268 | panic("cannot create ip6_dst_cache"); | |
2269 | ||
2270 | fib6_init(); | |
2271 | #ifdef CONFIG_PROC_FS | |
2272 | p = proc_net_create("ipv6_route", 0, rt6_proc_info); | |
2273 | if (p) | |
2274 | p->owner = THIS_MODULE; | |
2275 | ||
2276 | proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2277 | #endif | |
2278 | #ifdef CONFIG_XFRM | |
2279 | xfrm6_init(); | |
2280 | #endif | |
2281 | } | |
2282 | ||
2283 | void ip6_route_cleanup(void) | |
2284 | { | |
2285 | #ifdef CONFIG_PROC_FS | |
2286 | proc_net_remove("ipv6_route"); | |
2287 | proc_net_remove("rt6_stats"); | |
2288 | #endif | |
2289 | #ifdef CONFIG_XFRM | |
2290 | xfrm6_fini(); | |
2291 | #endif | |
2292 | rt6_ifdown(NULL); | |
2293 | fib6_gc_cleanup(); | |
2294 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2295 | } |