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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: | |
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/config.h> |
29 | #include <linux/errno.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/times.h> | |
32 | #include <linux/socket.h> | |
33 | #include <linux/sockios.h> | |
34 | #include <linux/net.h> | |
35 | #include <linux/route.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/in6.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/netlink.h> | |
40 | #include <linux/if_arp.h> | |
41 | ||
42 | #ifdef CONFIG_PROC_FS | |
43 | #include <linux/proc_fs.h> | |
44 | #include <linux/seq_file.h> | |
45 | #endif | |
46 | ||
47 | #include <net/snmp.h> | |
48 | #include <net/ipv6.h> | |
49 | #include <net/ip6_fib.h> | |
50 | #include <net/ip6_route.h> | |
51 | #include <net/ndisc.h> | |
52 | #include <net/addrconf.h> | |
53 | #include <net/tcp.h> | |
54 | #include <linux/rtnetlink.h> | |
55 | #include <net/dst.h> | |
56 | #include <net/xfrm.h> | |
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 | ||
101 | static struct dst_ops ip6_dst_ops = { | |
102 | .family = AF_INET6, | |
103 | .protocol = __constant_htons(ETH_P_IPV6), | |
104 | .gc = ip6_dst_gc, | |
105 | .gc_thresh = 1024, | |
106 | .check = ip6_dst_check, | |
107 | .destroy = ip6_dst_destroy, | |
108 | .ifdown = ip6_dst_ifdown, | |
109 | .negative_advice = ip6_negative_advice, | |
110 | .link_failure = ip6_link_failure, | |
111 | .update_pmtu = ip6_rt_update_pmtu, | |
112 | .entry_size = sizeof(struct rt6_info), | |
113 | }; | |
114 | ||
115 | struct rt6_info ip6_null_entry = { | |
116 | .u = { | |
117 | .dst = { | |
118 | .__refcnt = ATOMIC_INIT(1), | |
119 | .__use = 1, | |
120 | .dev = &loopback_dev, | |
121 | .obsolete = -1, | |
122 | .error = -ENETUNREACH, | |
123 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
124 | .input = ip6_pkt_discard, | |
125 | .output = ip6_pkt_discard_out, | |
126 | .ops = &ip6_dst_ops, | |
127 | .path = (struct dst_entry*)&ip6_null_entry, | |
128 | } | |
129 | }, | |
130 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
131 | .rt6i_metric = ~(u32) 0, | |
132 | .rt6i_ref = ATOMIC_INIT(1), | |
133 | }; | |
134 | ||
135 | struct fib6_node ip6_routing_table = { | |
136 | .leaf = &ip6_null_entry, | |
137 | .fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO, | |
138 | }; | |
139 | ||
140 | /* Protects all the ip6 fib */ | |
141 | ||
142 | DEFINE_RWLOCK(rt6_lock); | |
143 | ||
144 | ||
145 | /* allocate dst with ip6_dst_ops */ | |
146 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
147 | { | |
148 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
149 | } | |
150 | ||
151 | static void ip6_dst_destroy(struct dst_entry *dst) | |
152 | { | |
153 | struct rt6_info *rt = (struct rt6_info *)dst; | |
154 | struct inet6_dev *idev = rt->rt6i_idev; | |
155 | ||
156 | if (idev != NULL) { | |
157 | rt->rt6i_idev = NULL; | |
158 | in6_dev_put(idev); | |
159 | } | |
160 | } | |
161 | ||
162 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
163 | int how) | |
164 | { | |
165 | struct rt6_info *rt = (struct rt6_info *)dst; | |
166 | struct inet6_dev *idev = rt->rt6i_idev; | |
167 | ||
168 | if (dev != &loopback_dev && idev != NULL && idev->dev == dev) { | |
169 | struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev); | |
170 | if (loopback_idev != NULL) { | |
171 | rt->rt6i_idev = loopback_idev; | |
172 | in6_dev_put(idev); | |
173 | } | |
174 | } | |
175 | } | |
176 | ||
177 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
178 | { | |
179 | return (rt->rt6i_flags & RTF_EXPIRES && | |
180 | time_after(jiffies, rt->rt6i_expires)); | |
181 | } | |
182 | ||
183 | /* | |
184 | * Route lookup. Any rt6_lock is implied. | |
185 | */ | |
186 | ||
187 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
188 | int oif, | |
189 | int strict) | |
190 | { | |
191 | struct rt6_info *local = NULL; | |
192 | struct rt6_info *sprt; | |
193 | ||
194 | if (oif) { | |
195 | for (sprt = rt; sprt; sprt = sprt->u.next) { | |
196 | struct net_device *dev = sprt->rt6i_dev; | |
197 | if (dev->ifindex == oif) | |
198 | return sprt; | |
199 | if (dev->flags & IFF_LOOPBACK) { | |
200 | if (sprt->rt6i_idev == NULL || | |
201 | sprt->rt6i_idev->dev->ifindex != oif) { | |
202 | if (strict && oif) | |
203 | continue; | |
204 | if (local && (!oif || | |
205 | local->rt6i_idev->dev->ifindex == oif)) | |
206 | continue; | |
207 | } | |
208 | local = sprt; | |
209 | } | |
210 | } | |
211 | ||
212 | if (local) | |
213 | return local; | |
214 | ||
215 | if (strict) | |
216 | return &ip6_null_entry; | |
217 | } | |
218 | return rt; | |
219 | } | |
220 | ||
27097255 YH |
221 | #ifdef CONFIG_IPV6_ROUTER_PREF |
222 | static void rt6_probe(struct rt6_info *rt) | |
223 | { | |
224 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
225 | /* | |
226 | * Okay, this does not seem to be appropriate | |
227 | * for now, however, we need to check if it | |
228 | * is really so; aka Router Reachability Probing. | |
229 | * | |
230 | * Router Reachability Probe MUST be rate-limited | |
231 | * to no more than one per minute. | |
232 | */ | |
233 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
234 | return; | |
235 | read_lock_bh(&neigh->lock); | |
236 | if (!(neigh->nud_state & NUD_VALID) && | |
237 | time_after(jiffies, neigh->updated + 60 * HZ)) { | |
238 | struct in6_addr mcaddr; | |
239 | struct in6_addr *target; | |
240 | ||
241 | neigh->updated = jiffies; | |
242 | read_unlock_bh(&neigh->lock); | |
243 | ||
244 | target = (struct in6_addr *)&neigh->primary_key; | |
245 | addrconf_addr_solict_mult(target, &mcaddr); | |
246 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
247 | } else | |
248 | read_unlock_bh(&neigh->lock); | |
249 | } | |
250 | #else | |
251 | static inline void rt6_probe(struct rt6_info *rt) | |
252 | { | |
253 | return; | |
254 | } | |
255 | #endif | |
256 | ||
1da177e4 | 257 | /* |
554cfb7e | 258 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 259 | */ |
554cfb7e YH |
260 | static int inline rt6_check_dev(struct rt6_info *rt, int oif) |
261 | { | |
262 | struct net_device *dev = rt->rt6i_dev; | |
263 | if (!oif || dev->ifindex == oif) | |
264 | return 2; | |
265 | if ((dev->flags & IFF_LOOPBACK) && | |
266 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
267 | return 1; | |
268 | return 0; | |
269 | } | |
1da177e4 | 270 | |
554cfb7e | 271 | static int inline rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 272 | { |
554cfb7e YH |
273 | struct neighbour *neigh = rt->rt6i_nexthop; |
274 | int m = 0; | |
275 | if (neigh) { | |
276 | read_lock_bh(&neigh->lock); | |
277 | if (neigh->nud_state & NUD_VALID) | |
278 | m = 1; | |
279 | read_unlock_bh(&neigh->lock); | |
1da177e4 | 280 | } |
554cfb7e | 281 | return m; |
1da177e4 LT |
282 | } |
283 | ||
554cfb7e YH |
284 | static int rt6_score_route(struct rt6_info *rt, int oif, |
285 | int strict) | |
1da177e4 | 286 | { |
554cfb7e YH |
287 | int m = rt6_check_dev(rt, oif); |
288 | if (!m && (strict & RT6_SELECT_F_IFACE)) | |
289 | return -1; | |
ebacaaa0 YH |
290 | #ifdef CONFIG_IPV6_ROUTER_PREF |
291 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
292 | #endif | |
554cfb7e | 293 | if (rt6_check_neigh(rt)) |
ebacaaa0 | 294 | m |= 16; |
554cfb7e YH |
295 | else if (strict & RT6_SELECT_F_REACHABLE) |
296 | return -1; | |
297 | return m; | |
298 | } | |
299 | ||
300 | static struct rt6_info *rt6_select(struct rt6_info **head, int oif, | |
301 | int strict) | |
302 | { | |
303 | struct rt6_info *match = NULL, *last = NULL; | |
304 | struct rt6_info *rt, *rt0 = *head; | |
305 | u32 metric; | |
306 | int mpri = -1; | |
1da177e4 | 307 | |
554cfb7e YH |
308 | RT6_TRACE("%s(head=%p(*head=%p), oif=%d)\n", |
309 | __FUNCTION__, head, head ? *head : NULL, oif); | |
1da177e4 | 310 | |
554cfb7e YH |
311 | for (rt = rt0, metric = rt0->rt6i_metric; |
312 | rt && rt->rt6i_metric == metric; | |
313 | rt = rt->u.next) { | |
314 | int m; | |
1da177e4 | 315 | |
554cfb7e | 316 | if (rt6_check_expired(rt)) |
1da177e4 LT |
317 | continue; |
318 | ||
554cfb7e YH |
319 | last = rt; |
320 | ||
321 | m = rt6_score_route(rt, oif, strict); | |
322 | if (m < 0) | |
1da177e4 | 323 | continue; |
1da177e4 | 324 | |
554cfb7e | 325 | if (m > mpri) { |
27097255 | 326 | rt6_probe(match); |
554cfb7e | 327 | match = rt; |
1da177e4 | 328 | mpri = m; |
27097255 YH |
329 | } else { |
330 | rt6_probe(rt); | |
1da177e4 LT |
331 | } |
332 | } | |
333 | ||
554cfb7e YH |
334 | if (!match && |
335 | (strict & RT6_SELECT_F_REACHABLE) && | |
336 | last && last != rt0) { | |
337 | /* no entries matched; do round-robin */ | |
338 | *head = rt0->u.next; | |
339 | rt0->u.next = last->u.next; | |
340 | last->u.next = rt0; | |
1da177e4 | 341 | } |
1da177e4 | 342 | |
554cfb7e YH |
343 | RT6_TRACE("%s() => %p, score=%d\n", |
344 | __FUNCTION__, match, mpri); | |
1da177e4 | 345 | |
554cfb7e | 346 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
347 | } |
348 | ||
349 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, | |
350 | int oif, int strict) | |
351 | { | |
352 | struct fib6_node *fn; | |
353 | struct rt6_info *rt; | |
354 | ||
355 | read_lock_bh(&rt6_lock); | |
356 | fn = fib6_lookup(&ip6_routing_table, daddr, saddr); | |
357 | rt = rt6_device_match(fn->leaf, oif, strict); | |
358 | dst_hold(&rt->u.dst); | |
359 | rt->u.dst.__use++; | |
360 | read_unlock_bh(&rt6_lock); | |
361 | ||
362 | rt->u.dst.lastuse = jiffies; | |
363 | if (rt->u.dst.error == 0) | |
364 | return rt; | |
365 | dst_release(&rt->u.dst); | |
366 | return NULL; | |
367 | } | |
368 | ||
369 | /* ip6_ins_rt is called with FREE rt6_lock. | |
370 | It takes new route entry, the addition fails by any reason the | |
371 | route is freed. In any case, if caller does not hold it, it may | |
372 | be destroyed. | |
373 | */ | |
374 | ||
0d51aa80 JHS |
375 | int ip6_ins_rt(struct rt6_info *rt, struct nlmsghdr *nlh, |
376 | void *_rtattr, struct netlink_skb_parms *req) | |
1da177e4 LT |
377 | { |
378 | int err; | |
379 | ||
380 | write_lock_bh(&rt6_lock); | |
0d51aa80 | 381 | err = fib6_add(&ip6_routing_table, rt, nlh, _rtattr, req); |
1da177e4 LT |
382 | write_unlock_bh(&rt6_lock); |
383 | ||
384 | return err; | |
385 | } | |
386 | ||
95a9a5ba YH |
387 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
388 | struct in6_addr *saddr) | |
1da177e4 | 389 | { |
1da177e4 LT |
390 | struct rt6_info *rt; |
391 | ||
392 | /* | |
393 | * Clone the route. | |
394 | */ | |
395 | ||
396 | rt = ip6_rt_copy(ort); | |
397 | ||
398 | if (rt) { | |
58c4fb86 YH |
399 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
400 | if (rt->rt6i_dst.plen != 128 && | |
401 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
402 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 403 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 404 | } |
1da177e4 | 405 | |
58c4fb86 | 406 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
407 | rt->rt6i_dst.plen = 128; |
408 | rt->rt6i_flags |= RTF_CACHE; | |
409 | rt->u.dst.flags |= DST_HOST; | |
410 | ||
411 | #ifdef CONFIG_IPV6_SUBTREES | |
412 | if (rt->rt6i_src.plen && saddr) { | |
413 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
414 | rt->rt6i_src.plen = 128; | |
415 | } | |
416 | #endif | |
417 | ||
418 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
419 | ||
95a9a5ba | 420 | } |
1da177e4 | 421 | |
95a9a5ba YH |
422 | return rt; |
423 | } | |
1da177e4 | 424 | |
299d9939 YH |
425 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
426 | { | |
427 | struct rt6_info *rt = ip6_rt_copy(ort); | |
428 | if (rt) { | |
429 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
430 | rt->rt6i_dst.plen = 128; | |
431 | rt->rt6i_flags |= RTF_CACHE; | |
432 | if (rt->rt6i_flags & RTF_REJECT) | |
433 | rt->u.dst.error = ort->u.dst.error; | |
434 | rt->u.dst.flags |= DST_HOST; | |
435 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
436 | } | |
437 | return rt; | |
438 | } | |
439 | ||
1da177e4 | 440 | #define BACKTRACK() \ |
bb133964 | 441 | if (rt == &ip6_null_entry) { \ |
1da177e4 LT |
442 | while ((fn = fn->parent) != NULL) { \ |
443 | if (fn->fn_flags & RTN_ROOT) { \ | |
1da177e4 LT |
444 | goto out; \ |
445 | } \ | |
446 | if (fn->fn_flags & RTN_RTINFO) \ | |
447 | goto restart; \ | |
448 | } \ | |
449 | } | |
450 | ||
451 | ||
452 | void ip6_route_input(struct sk_buff *skb) | |
453 | { | |
454 | struct fib6_node *fn; | |
519fbd87 | 455 | struct rt6_info *rt, *nrt; |
1da177e4 LT |
456 | int strict; |
457 | int attempts = 3; | |
519fbd87 | 458 | int err; |
8238dd06 | 459 | int reachable = RT6_SELECT_F_REACHABLE; |
1da177e4 | 460 | |
118f8c16 | 461 | strict = ipv6_addr_type(&skb->nh.ipv6h->daddr) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL) ? RT6_SELECT_F_IFACE : 0; |
1da177e4 LT |
462 | |
463 | relookup: | |
464 | read_lock_bh(&rt6_lock); | |
465 | ||
8238dd06 | 466 | restart_2: |
1da177e4 LT |
467 | fn = fib6_lookup(&ip6_routing_table, &skb->nh.ipv6h->daddr, |
468 | &skb->nh.ipv6h->saddr); | |
469 | ||
470 | restart: | |
8238dd06 | 471 | rt = rt6_select(&fn->leaf, skb->dev->ifindex, strict | reachable); |
1da177e4 | 472 | BACKTRACK(); |
8238dd06 YH |
473 | if (rt == &ip6_null_entry || |
474 | rt->rt6i_flags & RTF_CACHE) | |
1ddef044 | 475 | goto out; |
1da177e4 | 476 | |
fb9de91e YH |
477 | dst_hold(&rt->u.dst); |
478 | read_unlock_bh(&rt6_lock); | |
479 | ||
519fbd87 YH |
480 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
481 | nrt = rt6_alloc_cow(rt, &skb->nh.ipv6h->daddr, &skb->nh.ipv6h->saddr); | |
482 | else { | |
483 | #if CLONE_OFFLINK_ROUTE | |
484 | nrt = rt6_alloc_clone(rt, &skb->nh.ipv6h->daddr); | |
485 | #else | |
486 | goto out2; | |
487 | #endif | |
488 | } | |
e40cf353 | 489 | |
519fbd87 YH |
490 | dst_release(&rt->u.dst); |
491 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 492 | |
519fbd87 YH |
493 | dst_hold(&rt->u.dst); |
494 | if (nrt) { | |
495 | err = ip6_ins_rt(nrt, NULL, NULL, &NETLINK_CB(skb)); | |
496 | if (!err) | |
1da177e4 | 497 | goto out2; |
1da177e4 | 498 | } |
1da177e4 | 499 | |
519fbd87 YH |
500 | if (--attempts <= 0) |
501 | goto out2; | |
502 | ||
503 | /* | |
504 | * Race condition! In the gap, when rt6_lock was | |
505 | * released someone could insert this route. Relookup. | |
506 | */ | |
507 | dst_release(&rt->u.dst); | |
508 | goto relookup; | |
509 | ||
510 | out: | |
8238dd06 YH |
511 | if (reachable) { |
512 | reachable = 0; | |
513 | goto restart_2; | |
514 | } | |
519fbd87 YH |
515 | dst_hold(&rt->u.dst); |
516 | read_unlock_bh(&rt6_lock); | |
1da177e4 LT |
517 | out2: |
518 | rt->u.dst.lastuse = jiffies; | |
519 | rt->u.dst.__use++; | |
520 | skb->dst = (struct dst_entry *) rt; | |
fb9de91e | 521 | return; |
1da177e4 LT |
522 | } |
523 | ||
524 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
525 | { | |
526 | struct fib6_node *fn; | |
519fbd87 | 527 | struct rt6_info *rt, *nrt; |
1da177e4 LT |
528 | int strict; |
529 | int attempts = 3; | |
519fbd87 | 530 | int err; |
8238dd06 | 531 | int reachable = RT6_SELECT_F_REACHABLE; |
1da177e4 | 532 | |
554cfb7e | 533 | strict = ipv6_addr_type(&fl->fl6_dst) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL) ? RT6_SELECT_F_IFACE : 0; |
1da177e4 LT |
534 | |
535 | relookup: | |
536 | read_lock_bh(&rt6_lock); | |
537 | ||
8238dd06 | 538 | restart_2: |
1da177e4 LT |
539 | fn = fib6_lookup(&ip6_routing_table, &fl->fl6_dst, &fl->fl6_src); |
540 | ||
541 | restart: | |
8238dd06 | 542 | rt = rt6_select(&fn->leaf, fl->oif, strict | reachable); |
1ddef044 | 543 | BACKTRACK(); |
8238dd06 YH |
544 | if (rt == &ip6_null_entry || |
545 | rt->rt6i_flags & RTF_CACHE) | |
1da177e4 | 546 | goto out; |
1da177e4 | 547 | |
fb9de91e YH |
548 | dst_hold(&rt->u.dst); |
549 | read_unlock_bh(&rt6_lock); | |
550 | ||
519fbd87 | 551 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
e40cf353 | 552 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
553 | else { |
554 | #if CLONE_OFFLINK_ROUTE | |
555 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); | |
556 | #else | |
557 | goto out2; | |
558 | #endif | |
559 | } | |
1da177e4 | 560 | |
519fbd87 YH |
561 | dst_release(&rt->u.dst); |
562 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 563 | |
519fbd87 YH |
564 | dst_hold(&rt->u.dst); |
565 | if (nrt) { | |
566 | err = ip6_ins_rt(nrt, NULL, NULL, NULL); | |
567 | if (!err) | |
1da177e4 | 568 | goto out2; |
1da177e4 | 569 | } |
e40cf353 | 570 | |
519fbd87 YH |
571 | if (--attempts <= 0) |
572 | goto out2; | |
573 | ||
574 | /* | |
575 | * Race condition! In the gap, when rt6_lock was | |
576 | * released someone could insert this route. Relookup. | |
577 | */ | |
578 | dst_release(&rt->u.dst); | |
579 | goto relookup; | |
580 | ||
581 | out: | |
8238dd06 YH |
582 | if (reachable) { |
583 | reachable = 0; | |
584 | goto restart_2; | |
585 | } | |
519fbd87 YH |
586 | dst_hold(&rt->u.dst); |
587 | read_unlock_bh(&rt6_lock); | |
1da177e4 LT |
588 | out2: |
589 | rt->u.dst.lastuse = jiffies; | |
590 | rt->u.dst.__use++; | |
591 | return &rt->u.dst; | |
592 | } | |
593 | ||
594 | ||
595 | /* | |
596 | * Destination cache support functions | |
597 | */ | |
598 | ||
599 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
600 | { | |
601 | struct rt6_info *rt; | |
602 | ||
603 | rt = (struct rt6_info *) dst; | |
604 | ||
605 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
606 | return dst; | |
607 | ||
608 | return NULL; | |
609 | } | |
610 | ||
611 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
612 | { | |
613 | struct rt6_info *rt = (struct rt6_info *) dst; | |
614 | ||
615 | if (rt) { | |
616 | if (rt->rt6i_flags & RTF_CACHE) | |
0d51aa80 | 617 | ip6_del_rt(rt, NULL, NULL, NULL); |
1da177e4 LT |
618 | else |
619 | dst_release(dst); | |
620 | } | |
621 | return NULL; | |
622 | } | |
623 | ||
624 | static void ip6_link_failure(struct sk_buff *skb) | |
625 | { | |
626 | struct rt6_info *rt; | |
627 | ||
628 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
629 | ||
630 | rt = (struct rt6_info *) skb->dst; | |
631 | if (rt) { | |
632 | if (rt->rt6i_flags&RTF_CACHE) { | |
633 | dst_set_expires(&rt->u.dst, 0); | |
634 | rt->rt6i_flags |= RTF_EXPIRES; | |
635 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
636 | rt->rt6i_node->fn_sernum = -1; | |
637 | } | |
638 | } | |
639 | ||
640 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
641 | { | |
642 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
643 | ||
644 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
645 | rt6->rt6i_flags |= RTF_MODIFIED; | |
646 | if (mtu < IPV6_MIN_MTU) { | |
647 | mtu = IPV6_MIN_MTU; | |
648 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
649 | } | |
650 | dst->metrics[RTAX_MTU-1] = mtu; | |
651 | } | |
652 | } | |
653 | ||
654 | /* Protected by rt6_lock. */ | |
655 | static struct dst_entry *ndisc_dst_gc_list; | |
656 | static int ipv6_get_mtu(struct net_device *dev); | |
657 | ||
658 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
659 | { | |
660 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
661 | ||
662 | if (mtu < ip6_rt_min_advmss) | |
663 | mtu = ip6_rt_min_advmss; | |
664 | ||
665 | /* | |
666 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and | |
667 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
668 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
669 | * rely only on pmtu discovery" | |
670 | */ | |
671 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
672 | mtu = IPV6_MAXPLEN; | |
673 | return mtu; | |
674 | } | |
675 | ||
676 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, | |
677 | struct neighbour *neigh, | |
678 | struct in6_addr *addr, | |
679 | int (*output)(struct sk_buff *)) | |
680 | { | |
681 | struct rt6_info *rt; | |
682 | struct inet6_dev *idev = in6_dev_get(dev); | |
683 | ||
684 | if (unlikely(idev == NULL)) | |
685 | return NULL; | |
686 | ||
687 | rt = ip6_dst_alloc(); | |
688 | if (unlikely(rt == NULL)) { | |
689 | in6_dev_put(idev); | |
690 | goto out; | |
691 | } | |
692 | ||
693 | dev_hold(dev); | |
694 | if (neigh) | |
695 | neigh_hold(neigh); | |
696 | else | |
697 | neigh = ndisc_get_neigh(dev, addr); | |
698 | ||
699 | rt->rt6i_dev = dev; | |
700 | rt->rt6i_idev = idev; | |
701 | rt->rt6i_nexthop = neigh; | |
702 | atomic_set(&rt->u.dst.__refcnt, 1); | |
703 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
704 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
705 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
706 | rt->u.dst.output = output; | |
707 | ||
708 | #if 0 /* there's no chance to use these for ndisc */ | |
709 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST | |
710 | ? DST_HOST | |
711 | : 0; | |
712 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
713 | rt->rt6i_dst.plen = 128; | |
714 | #endif | |
715 | ||
716 | write_lock_bh(&rt6_lock); | |
717 | rt->u.dst.next = ndisc_dst_gc_list; | |
718 | ndisc_dst_gc_list = &rt->u.dst; | |
719 | write_unlock_bh(&rt6_lock); | |
720 | ||
721 | fib6_force_start_gc(); | |
722 | ||
723 | out: | |
724 | return (struct dst_entry *)rt; | |
725 | } | |
726 | ||
727 | int ndisc_dst_gc(int *more) | |
728 | { | |
729 | struct dst_entry *dst, *next, **pprev; | |
730 | int freed; | |
731 | ||
732 | next = NULL; | |
733 | pprev = &ndisc_dst_gc_list; | |
734 | freed = 0; | |
735 | while ((dst = *pprev) != NULL) { | |
736 | if (!atomic_read(&dst->__refcnt)) { | |
737 | *pprev = dst->next; | |
738 | dst_free(dst); | |
739 | freed++; | |
740 | } else { | |
741 | pprev = &dst->next; | |
742 | (*more)++; | |
743 | } | |
744 | } | |
745 | ||
746 | return freed; | |
747 | } | |
748 | ||
749 | static int ip6_dst_gc(void) | |
750 | { | |
751 | static unsigned expire = 30*HZ; | |
752 | static unsigned long last_gc; | |
753 | unsigned long now = jiffies; | |
754 | ||
755 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && | |
756 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) | |
757 | goto out; | |
758 | ||
759 | expire++; | |
760 | fib6_run_gc(expire); | |
761 | last_gc = now; | |
762 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
763 | expire = ip6_rt_gc_timeout>>1; | |
764 | ||
765 | out: | |
766 | expire -= expire>>ip6_rt_gc_elasticity; | |
767 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); | |
768 | } | |
769 | ||
770 | /* Clean host part of a prefix. Not necessary in radix tree, | |
771 | but results in cleaner routing tables. | |
772 | ||
773 | Remove it only when all the things will work! | |
774 | */ | |
775 | ||
776 | static int ipv6_get_mtu(struct net_device *dev) | |
777 | { | |
778 | int mtu = IPV6_MIN_MTU; | |
779 | struct inet6_dev *idev; | |
780 | ||
781 | idev = in6_dev_get(dev); | |
782 | if (idev) { | |
783 | mtu = idev->cnf.mtu6; | |
784 | in6_dev_put(idev); | |
785 | } | |
786 | return mtu; | |
787 | } | |
788 | ||
789 | int ipv6_get_hoplimit(struct net_device *dev) | |
790 | { | |
791 | int hoplimit = ipv6_devconf.hop_limit; | |
792 | struct inet6_dev *idev; | |
793 | ||
794 | idev = in6_dev_get(dev); | |
795 | if (idev) { | |
796 | hoplimit = idev->cnf.hop_limit; | |
797 | in6_dev_put(idev); | |
798 | } | |
799 | return hoplimit; | |
800 | } | |
801 | ||
802 | /* | |
803 | * | |
804 | */ | |
805 | ||
0d51aa80 JHS |
806 | int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, |
807 | void *_rtattr, struct netlink_skb_parms *req) | |
1da177e4 LT |
808 | { |
809 | int err; | |
810 | struct rtmsg *r; | |
811 | struct rtattr **rta; | |
812 | struct rt6_info *rt = NULL; | |
813 | struct net_device *dev = NULL; | |
814 | struct inet6_dev *idev = NULL; | |
815 | int addr_type; | |
816 | ||
817 | rta = (struct rtattr **) _rtattr; | |
818 | ||
819 | if (rtmsg->rtmsg_dst_len > 128 || rtmsg->rtmsg_src_len > 128) | |
820 | return -EINVAL; | |
821 | #ifndef CONFIG_IPV6_SUBTREES | |
822 | if (rtmsg->rtmsg_src_len) | |
823 | return -EINVAL; | |
824 | #endif | |
825 | if (rtmsg->rtmsg_ifindex) { | |
826 | err = -ENODEV; | |
827 | dev = dev_get_by_index(rtmsg->rtmsg_ifindex); | |
828 | if (!dev) | |
829 | goto out; | |
830 | idev = in6_dev_get(dev); | |
831 | if (!idev) | |
832 | goto out; | |
833 | } | |
834 | ||
835 | if (rtmsg->rtmsg_metric == 0) | |
836 | rtmsg->rtmsg_metric = IP6_RT_PRIO_USER; | |
837 | ||
838 | rt = ip6_dst_alloc(); | |
839 | ||
840 | if (rt == NULL) { | |
841 | err = -ENOMEM; | |
842 | goto out; | |
843 | } | |
844 | ||
845 | rt->u.dst.obsolete = -1; | |
3dd4bc68 | 846 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(rtmsg->rtmsg_info); |
1da177e4 LT |
847 | if (nlh && (r = NLMSG_DATA(nlh))) { |
848 | rt->rt6i_protocol = r->rtm_protocol; | |
849 | } else { | |
850 | rt->rt6i_protocol = RTPROT_BOOT; | |
851 | } | |
852 | ||
853 | addr_type = ipv6_addr_type(&rtmsg->rtmsg_dst); | |
854 | ||
855 | if (addr_type & IPV6_ADDR_MULTICAST) | |
856 | rt->u.dst.input = ip6_mc_input; | |
857 | else | |
858 | rt->u.dst.input = ip6_forward; | |
859 | ||
860 | rt->u.dst.output = ip6_output; | |
861 | ||
862 | ipv6_addr_prefix(&rt->rt6i_dst.addr, | |
863 | &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len); | |
864 | rt->rt6i_dst.plen = rtmsg->rtmsg_dst_len; | |
865 | if (rt->rt6i_dst.plen == 128) | |
866 | rt->u.dst.flags = DST_HOST; | |
867 | ||
868 | #ifdef CONFIG_IPV6_SUBTREES | |
869 | ipv6_addr_prefix(&rt->rt6i_src.addr, | |
870 | &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len); | |
871 | rt->rt6i_src.plen = rtmsg->rtmsg_src_len; | |
872 | #endif | |
873 | ||
874 | rt->rt6i_metric = rtmsg->rtmsg_metric; | |
875 | ||
876 | /* We cannot add true routes via loopback here, | |
877 | they would result in kernel looping; promote them to reject routes | |
878 | */ | |
879 | if ((rtmsg->rtmsg_flags&RTF_REJECT) || | |
880 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { | |
881 | /* hold loopback dev/idev if we haven't done so. */ | |
882 | if (dev != &loopback_dev) { | |
883 | if (dev) { | |
884 | dev_put(dev); | |
885 | in6_dev_put(idev); | |
886 | } | |
887 | dev = &loopback_dev; | |
888 | dev_hold(dev); | |
889 | idev = in6_dev_get(dev); | |
890 | if (!idev) { | |
891 | err = -ENODEV; | |
892 | goto out; | |
893 | } | |
894 | } | |
895 | rt->u.dst.output = ip6_pkt_discard_out; | |
896 | rt->u.dst.input = ip6_pkt_discard; | |
897 | rt->u.dst.error = -ENETUNREACH; | |
898 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
899 | goto install_route; | |
900 | } | |
901 | ||
902 | if (rtmsg->rtmsg_flags & RTF_GATEWAY) { | |
903 | struct in6_addr *gw_addr; | |
904 | int gwa_type; | |
905 | ||
906 | gw_addr = &rtmsg->rtmsg_gateway; | |
907 | ipv6_addr_copy(&rt->rt6i_gateway, &rtmsg->rtmsg_gateway); | |
908 | gwa_type = ipv6_addr_type(gw_addr); | |
909 | ||
910 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
911 | struct rt6_info *grt; | |
912 | ||
913 | /* IPv6 strictly inhibits using not link-local | |
914 | addresses as nexthop address. | |
915 | Otherwise, router will not able to send redirects. | |
916 | It is very good, but in some (rare!) circumstances | |
917 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
918 | some exceptions. --ANK | |
919 | */ | |
920 | err = -EINVAL; | |
921 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
922 | goto out; | |
923 | ||
924 | grt = rt6_lookup(gw_addr, NULL, rtmsg->rtmsg_ifindex, 1); | |
925 | ||
926 | err = -EHOSTUNREACH; | |
927 | if (grt == NULL) | |
928 | goto out; | |
929 | if (dev) { | |
930 | if (dev != grt->rt6i_dev) { | |
931 | dst_release(&grt->u.dst); | |
932 | goto out; | |
933 | } | |
934 | } else { | |
935 | dev = grt->rt6i_dev; | |
936 | idev = grt->rt6i_idev; | |
937 | dev_hold(dev); | |
938 | in6_dev_hold(grt->rt6i_idev); | |
939 | } | |
940 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
941 | err = 0; | |
942 | dst_release(&grt->u.dst); | |
943 | ||
944 | if (err) | |
945 | goto out; | |
946 | } | |
947 | err = -EINVAL; | |
948 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
949 | goto out; | |
950 | } | |
951 | ||
952 | err = -ENODEV; | |
953 | if (dev == NULL) | |
954 | goto out; | |
955 | ||
956 | if (rtmsg->rtmsg_flags & (RTF_GATEWAY|RTF_NONEXTHOP)) { | |
957 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); | |
958 | if (IS_ERR(rt->rt6i_nexthop)) { | |
959 | err = PTR_ERR(rt->rt6i_nexthop); | |
960 | rt->rt6i_nexthop = NULL; | |
961 | goto out; | |
962 | } | |
963 | } | |
964 | ||
965 | rt->rt6i_flags = rtmsg->rtmsg_flags; | |
966 | ||
967 | install_route: | |
968 | if (rta && rta[RTA_METRICS-1]) { | |
969 | int attrlen = RTA_PAYLOAD(rta[RTA_METRICS-1]); | |
970 | struct rtattr *attr = RTA_DATA(rta[RTA_METRICS-1]); | |
971 | ||
972 | while (RTA_OK(attr, attrlen)) { | |
973 | unsigned flavor = attr->rta_type; | |
974 | if (flavor) { | |
975 | if (flavor > RTAX_MAX) { | |
976 | err = -EINVAL; | |
977 | goto out; | |
978 | } | |
979 | rt->u.dst.metrics[flavor-1] = | |
980 | *(u32 *)RTA_DATA(attr); | |
981 | } | |
982 | attr = RTA_NEXT(attr, attrlen); | |
983 | } | |
984 | } | |
985 | ||
986 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
987 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
988 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
989 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
990 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
991 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
992 | rt->u.dst.dev = dev; | |
993 | rt->rt6i_idev = idev; | |
0d51aa80 | 994 | return ip6_ins_rt(rt, nlh, _rtattr, req); |
1da177e4 LT |
995 | |
996 | out: | |
997 | if (dev) | |
998 | dev_put(dev); | |
999 | if (idev) | |
1000 | in6_dev_put(idev); | |
1001 | if (rt) | |
1002 | dst_free((struct dst_entry *) rt); | |
1003 | return err; | |
1004 | } | |
1005 | ||
0d51aa80 | 1006 | int ip6_del_rt(struct rt6_info *rt, struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req) |
1da177e4 LT |
1007 | { |
1008 | int err; | |
1009 | ||
1010 | write_lock_bh(&rt6_lock); | |
1011 | ||
0d51aa80 | 1012 | err = fib6_del(rt, nlh, _rtattr, req); |
1da177e4 LT |
1013 | dst_release(&rt->u.dst); |
1014 | ||
1015 | write_unlock_bh(&rt6_lock); | |
1016 | ||
1017 | return err; | |
1018 | } | |
1019 | ||
0d51aa80 | 1020 | static int ip6_route_del(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req) |
1da177e4 LT |
1021 | { |
1022 | struct fib6_node *fn; | |
1023 | struct rt6_info *rt; | |
1024 | int err = -ESRCH; | |
1025 | ||
1026 | read_lock_bh(&rt6_lock); | |
1027 | ||
1028 | fn = fib6_locate(&ip6_routing_table, | |
1029 | &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len, | |
1030 | &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len); | |
1031 | ||
1032 | if (fn) { | |
1033 | for (rt = fn->leaf; rt; rt = rt->u.next) { | |
1034 | if (rtmsg->rtmsg_ifindex && | |
1035 | (rt->rt6i_dev == NULL || | |
1036 | rt->rt6i_dev->ifindex != rtmsg->rtmsg_ifindex)) | |
1037 | continue; | |
1038 | if (rtmsg->rtmsg_flags&RTF_GATEWAY && | |
1039 | !ipv6_addr_equal(&rtmsg->rtmsg_gateway, &rt->rt6i_gateway)) | |
1040 | continue; | |
1041 | if (rtmsg->rtmsg_metric && | |
1042 | rtmsg->rtmsg_metric != rt->rt6i_metric) | |
1043 | continue; | |
1044 | dst_hold(&rt->u.dst); | |
1045 | read_unlock_bh(&rt6_lock); | |
1046 | ||
0d51aa80 | 1047 | return ip6_del_rt(rt, nlh, _rtattr, req); |
1da177e4 LT |
1048 | } |
1049 | } | |
1050 | read_unlock_bh(&rt6_lock); | |
1051 | ||
1052 | return err; | |
1053 | } | |
1054 | ||
1055 | /* | |
1056 | * Handle redirects | |
1057 | */ | |
1058 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *saddr, | |
1059 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1060 | { | |
1061 | struct rt6_info *rt, *nrt; | |
1062 | ||
1063 | /* Locate old route to this destination. */ | |
1064 | rt = rt6_lookup(dest, NULL, neigh->dev->ifindex, 1); | |
1065 | ||
1066 | if (rt == NULL) | |
1067 | return; | |
1068 | ||
1069 | if (neigh->dev != rt->rt6i_dev) | |
1070 | goto out; | |
1071 | ||
1072 | /* | |
1073 | * Current route is on-link; redirect is always invalid. | |
1074 | * | |
1075 | * Seems, previous statement is not true. It could | |
1076 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1077 | * But then router serving it might decide, that we should | |
1078 | * know truth 8)8) --ANK (980726). | |
1079 | */ | |
1080 | if (!(rt->rt6i_flags&RTF_GATEWAY)) | |
1081 | goto out; | |
1082 | ||
1083 | /* | |
1084 | * RFC 2461 specifies that redirects should only be | |
1085 | * accepted if they come from the nexthop to the target. | |
1086 | * Due to the way default routers are chosen, this notion | |
1087 | * is a bit fuzzy and one might need to check all default | |
1088 | * routers. | |
1089 | */ | |
1090 | if (!ipv6_addr_equal(saddr, &rt->rt6i_gateway)) { | |
1091 | if (rt->rt6i_flags & RTF_DEFAULT) { | |
1092 | struct rt6_info *rt1; | |
1093 | ||
1094 | read_lock(&rt6_lock); | |
1095 | for (rt1 = ip6_routing_table.leaf; rt1; rt1 = rt1->u.next) { | |
1096 | if (ipv6_addr_equal(saddr, &rt1->rt6i_gateway)) { | |
1097 | dst_hold(&rt1->u.dst); | |
1098 | dst_release(&rt->u.dst); | |
1099 | read_unlock(&rt6_lock); | |
1100 | rt = rt1; | |
1101 | goto source_ok; | |
1102 | } | |
1103 | } | |
1104 | read_unlock(&rt6_lock); | |
1105 | } | |
1106 | if (net_ratelimit()) | |
1107 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1108 | "for redirect target\n"); | |
1109 | goto out; | |
1110 | } | |
1111 | ||
1112 | source_ok: | |
1113 | ||
1114 | /* | |
1115 | * We have finally decided to accept it. | |
1116 | */ | |
1117 | ||
1118 | neigh_update(neigh, lladdr, NUD_STALE, | |
1119 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1120 | NEIGH_UPDATE_F_OVERRIDE| | |
1121 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1122 | NEIGH_UPDATE_F_ISROUTER)) | |
1123 | ); | |
1124 | ||
1125 | /* | |
1126 | * Redirect received -> path was valid. | |
1127 | * Look, redirects are sent only in response to data packets, | |
1128 | * so that this nexthop apparently is reachable. --ANK | |
1129 | */ | |
1130 | dst_confirm(&rt->u.dst); | |
1131 | ||
1132 | /* Duplicate redirect: silently ignore. */ | |
1133 | if (neigh == rt->u.dst.neighbour) | |
1134 | goto out; | |
1135 | ||
1136 | nrt = ip6_rt_copy(rt); | |
1137 | if (nrt == NULL) | |
1138 | goto out; | |
1139 | ||
1140 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1141 | if (on_link) | |
1142 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1143 | ||
1144 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1145 | nrt->rt6i_dst.plen = 128; | |
1146 | nrt->u.dst.flags |= DST_HOST; | |
1147 | ||
1148 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1149 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1150 | /* Reset pmtu, it may be better */ | |
1151 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1152 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1153 | ||
0d51aa80 | 1154 | if (ip6_ins_rt(nrt, NULL, NULL, NULL)) |
1da177e4 LT |
1155 | goto out; |
1156 | ||
1157 | if (rt->rt6i_flags&RTF_CACHE) { | |
0d51aa80 | 1158 | ip6_del_rt(rt, NULL, NULL, NULL); |
1da177e4 LT |
1159 | return; |
1160 | } | |
1161 | ||
1162 | out: | |
1163 | dst_release(&rt->u.dst); | |
1164 | return; | |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * Handle ICMP "packet too big" messages | |
1169 | * i.e. Path MTU discovery | |
1170 | */ | |
1171 | ||
1172 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1173 | struct net_device *dev, u32 pmtu) | |
1174 | { | |
1175 | struct rt6_info *rt, *nrt; | |
1176 | int allfrag = 0; | |
1177 | ||
1178 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1179 | if (rt == NULL) | |
1180 | return; | |
1181 | ||
1182 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1183 | goto out; | |
1184 | ||
1185 | if (pmtu < IPV6_MIN_MTU) { | |
1186 | /* | |
1187 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link | |
1188 | * MTU (1280) and a fragment header should always be included | |
1189 | * after a node receiving Too Big message reporting PMTU is | |
1190 | * less than the IPv6 Minimum Link MTU. | |
1191 | */ | |
1192 | pmtu = IPV6_MIN_MTU; | |
1193 | allfrag = 1; | |
1194 | } | |
1195 | ||
1196 | /* New mtu received -> path was valid. | |
1197 | They are sent only in response to data packets, | |
1198 | so that this nexthop apparently is reachable. --ANK | |
1199 | */ | |
1200 | dst_confirm(&rt->u.dst); | |
1201 | ||
1202 | /* Host route. If it is static, it would be better | |
1203 | not to override it, but add new one, so that | |
1204 | when cache entry will expire old pmtu | |
1205 | would return automatically. | |
1206 | */ | |
1207 | if (rt->rt6i_flags & RTF_CACHE) { | |
1208 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1209 | if (allfrag) | |
1210 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1211 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); | |
1212 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; | |
1213 | goto out; | |
1214 | } | |
1215 | ||
1216 | /* Network route. | |
1217 | Two cases are possible: | |
1218 | 1. It is connected route. Action: COW | |
1219 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1220 | */ | |
d5315b50 | 1221 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1222 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1223 | else |
1224 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1225 | |
d5315b50 | 1226 | if (nrt) { |
a1e78363 YH |
1227 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1228 | if (allfrag) | |
1229 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1230 | ||
1231 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1232 | * happened within 5 mins, the recommended timer is 10 mins. | |
1233 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1234 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1235 | * and detecting PMTU increase will be automatically happened. | |
1236 | */ | |
1237 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); | |
1238 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; | |
1239 | ||
1240 | ip6_ins_rt(nrt, NULL, NULL, NULL); | |
1da177e4 | 1241 | } |
1da177e4 LT |
1242 | out: |
1243 | dst_release(&rt->u.dst); | |
1244 | } | |
1245 | ||
1246 | /* | |
1247 | * Misc support functions | |
1248 | */ | |
1249 | ||
1250 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1251 | { | |
1252 | struct rt6_info *rt = ip6_dst_alloc(); | |
1253 | ||
1254 | if (rt) { | |
1255 | rt->u.dst.input = ort->u.dst.input; | |
1256 | rt->u.dst.output = ort->u.dst.output; | |
1257 | ||
1258 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
1259 | rt->u.dst.dev = ort->u.dst.dev; | |
1260 | if (rt->u.dst.dev) | |
1261 | dev_hold(rt->u.dst.dev); | |
1262 | rt->rt6i_idev = ort->rt6i_idev; | |
1263 | if (rt->rt6i_idev) | |
1264 | in6_dev_hold(rt->rt6i_idev); | |
1265 | rt->u.dst.lastuse = jiffies; | |
1266 | rt->rt6i_expires = 0; | |
1267 | ||
1268 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1269 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1270 | rt->rt6i_metric = 0; | |
1271 | ||
1272 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1273 | #ifdef CONFIG_IPV6_SUBTREES | |
1274 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1275 | #endif | |
1276 | } | |
1277 | return rt; | |
1278 | } | |
1279 | ||
1280 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) | |
1281 | { | |
1282 | struct rt6_info *rt; | |
1283 | struct fib6_node *fn; | |
1284 | ||
1285 | fn = &ip6_routing_table; | |
1286 | ||
1287 | write_lock_bh(&rt6_lock); | |
1288 | for (rt = fn->leaf; rt; rt=rt->u.next) { | |
1289 | if (dev == rt->rt6i_dev && | |
045927ff | 1290 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1291 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1292 | break; | |
1293 | } | |
1294 | if (rt) | |
1295 | dst_hold(&rt->u.dst); | |
1296 | write_unlock_bh(&rt6_lock); | |
1297 | return rt; | |
1298 | } | |
1299 | ||
1300 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1301 | struct net_device *dev, |
1302 | unsigned int pref) | |
1da177e4 LT |
1303 | { |
1304 | struct in6_rtmsg rtmsg; | |
1305 | ||
1306 | memset(&rtmsg, 0, sizeof(struct in6_rtmsg)); | |
1307 | rtmsg.rtmsg_type = RTMSG_NEWROUTE; | |
1308 | ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr); | |
1309 | rtmsg.rtmsg_metric = 1024; | |
ebacaaa0 YH |
1310 | rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | RTF_UP | RTF_EXPIRES | |
1311 | RTF_PREF(pref); | |
1da177e4 LT |
1312 | |
1313 | rtmsg.rtmsg_ifindex = dev->ifindex; | |
1314 | ||
0d51aa80 | 1315 | ip6_route_add(&rtmsg, NULL, NULL, NULL); |
1da177e4 LT |
1316 | return rt6_get_dflt_router(gwaddr, dev); |
1317 | } | |
1318 | ||
1319 | void rt6_purge_dflt_routers(void) | |
1320 | { | |
1321 | struct rt6_info *rt; | |
1322 | ||
1323 | restart: | |
1324 | read_lock_bh(&rt6_lock); | |
1325 | for (rt = ip6_routing_table.leaf; rt; rt = rt->u.next) { | |
1326 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { | |
1327 | dst_hold(&rt->u.dst); | |
1328 | ||
1da177e4 LT |
1329 | read_unlock_bh(&rt6_lock); |
1330 | ||
0d51aa80 | 1331 | ip6_del_rt(rt, NULL, NULL, NULL); |
1da177e4 LT |
1332 | |
1333 | goto restart; | |
1334 | } | |
1335 | } | |
1336 | read_unlock_bh(&rt6_lock); | |
1337 | } | |
1338 | ||
1339 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) | |
1340 | { | |
1341 | struct in6_rtmsg rtmsg; | |
1342 | int err; | |
1343 | ||
1344 | switch(cmd) { | |
1345 | case SIOCADDRT: /* Add a route */ | |
1346 | case SIOCDELRT: /* Delete a route */ | |
1347 | if (!capable(CAP_NET_ADMIN)) | |
1348 | return -EPERM; | |
1349 | err = copy_from_user(&rtmsg, arg, | |
1350 | sizeof(struct in6_rtmsg)); | |
1351 | if (err) | |
1352 | return -EFAULT; | |
1353 | ||
1354 | rtnl_lock(); | |
1355 | switch (cmd) { | |
1356 | case SIOCADDRT: | |
0d51aa80 | 1357 | err = ip6_route_add(&rtmsg, NULL, NULL, NULL); |
1da177e4 LT |
1358 | break; |
1359 | case SIOCDELRT: | |
0d51aa80 | 1360 | err = ip6_route_del(&rtmsg, NULL, NULL, NULL); |
1da177e4 LT |
1361 | break; |
1362 | default: | |
1363 | err = -EINVAL; | |
1364 | } | |
1365 | rtnl_unlock(); | |
1366 | ||
1367 | return err; | |
1368 | }; | |
1369 | ||
1370 | return -EINVAL; | |
1371 | } | |
1372 | ||
1373 | /* | |
1374 | * Drop the packet on the floor | |
1375 | */ | |
1376 | ||
20380731 | 1377 | static int ip6_pkt_discard(struct sk_buff *skb) |
1da177e4 LT |
1378 | { |
1379 | IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES); | |
1380 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev); | |
1381 | kfree_skb(skb); | |
1382 | return 0; | |
1383 | } | |
1384 | ||
20380731 | 1385 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1386 | { |
1387 | skb->dev = skb->dst->dev; | |
1388 | return ip6_pkt_discard(skb); | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * Allocate a dst for local (unicast / anycast) address. | |
1393 | */ | |
1394 | ||
1395 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1396 | const struct in6_addr *addr, | |
1397 | int anycast) | |
1398 | { | |
1399 | struct rt6_info *rt = ip6_dst_alloc(); | |
1400 | ||
1401 | if (rt == NULL) | |
1402 | return ERR_PTR(-ENOMEM); | |
1403 | ||
1404 | dev_hold(&loopback_dev); | |
1405 | in6_dev_hold(idev); | |
1406 | ||
1407 | rt->u.dst.flags = DST_HOST; | |
1408 | rt->u.dst.input = ip6_input; | |
1409 | rt->u.dst.output = ip6_output; | |
1410 | rt->rt6i_dev = &loopback_dev; | |
1411 | rt->rt6i_idev = idev; | |
1412 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1413 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1414 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1415 | rt->u.dst.obsolete = -1; | |
1416 | ||
1417 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1418 | if (anycast) |
1419 | rt->rt6i_flags |= RTF_ANYCAST; | |
1420 | else | |
1da177e4 LT |
1421 | rt->rt6i_flags |= RTF_LOCAL; |
1422 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1423 | if (rt->rt6i_nexthop == NULL) { | |
1424 | dst_free((struct dst_entry *) rt); | |
1425 | return ERR_PTR(-ENOMEM); | |
1426 | } | |
1427 | ||
1428 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1429 | rt->rt6i_dst.plen = 128; | |
1430 | ||
1431 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1432 | ||
1433 | return rt; | |
1434 | } | |
1435 | ||
1436 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1437 | { | |
1438 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1439 | rt != &ip6_null_entry) { | |
1440 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1441 | return -1; | |
1442 | } | |
1443 | return 0; | |
1444 | } | |
1445 | ||
1446 | void rt6_ifdown(struct net_device *dev) | |
1447 | { | |
1448 | write_lock_bh(&rt6_lock); | |
1449 | fib6_clean_tree(&ip6_routing_table, fib6_ifdown, 0, dev); | |
1450 | write_unlock_bh(&rt6_lock); | |
1451 | } | |
1452 | ||
1453 | struct rt6_mtu_change_arg | |
1454 | { | |
1455 | struct net_device *dev; | |
1456 | unsigned mtu; | |
1457 | }; | |
1458 | ||
1459 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1460 | { | |
1461 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1462 | struct inet6_dev *idev; | |
1463 | ||
1464 | /* In IPv6 pmtu discovery is not optional, | |
1465 | so that RTAX_MTU lock cannot disable it. | |
1466 | We still use this lock to block changes | |
1467 | caused by addrconf/ndisc. | |
1468 | */ | |
1469 | ||
1470 | idev = __in6_dev_get(arg->dev); | |
1471 | if (idev == NULL) | |
1472 | return 0; | |
1473 | ||
1474 | /* For administrative MTU increase, there is no way to discover | |
1475 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1476 | Since RFC 1981 doesn't include administrative MTU increase | |
1477 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1478 | */ | |
1479 | /* | |
1480 | If new MTU is less than route PMTU, this new MTU will be the | |
1481 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1482 | decreases; if new MTU is greater than route PMTU, and the | |
1483 | old MTU is the lowest MTU in the path, update the route PMTU | |
1484 | to reflect the increase. In this case if the other nodes' MTU | |
1485 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1486 | PMTU discouvery. | |
1487 | */ | |
1488 | if (rt->rt6i_dev == arg->dev && | |
1489 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
1490 | (dst_mtu(&rt->u.dst) > arg->mtu || | |
1491 | (dst_mtu(&rt->u.dst) < arg->mtu && | |
1492 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) | |
1493 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; | |
1494 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); | |
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1499 | { | |
1500 | struct rt6_mtu_change_arg arg; | |
1501 | ||
1502 | arg.dev = dev; | |
1503 | arg.mtu = mtu; | |
1504 | read_lock_bh(&rt6_lock); | |
1505 | fib6_clean_tree(&ip6_routing_table, rt6_mtu_change_route, 0, &arg); | |
1506 | read_unlock_bh(&rt6_lock); | |
1507 | } | |
1508 | ||
1509 | static int inet6_rtm_to_rtmsg(struct rtmsg *r, struct rtattr **rta, | |
1510 | struct in6_rtmsg *rtmsg) | |
1511 | { | |
1512 | memset(rtmsg, 0, sizeof(*rtmsg)); | |
1513 | ||
1514 | rtmsg->rtmsg_dst_len = r->rtm_dst_len; | |
1515 | rtmsg->rtmsg_src_len = r->rtm_src_len; | |
1516 | rtmsg->rtmsg_flags = RTF_UP; | |
1517 | if (r->rtm_type == RTN_UNREACHABLE) | |
1518 | rtmsg->rtmsg_flags |= RTF_REJECT; | |
1519 | ||
1520 | if (rta[RTA_GATEWAY-1]) { | |
1521 | if (rta[RTA_GATEWAY-1]->rta_len != RTA_LENGTH(16)) | |
1522 | return -EINVAL; | |
1523 | memcpy(&rtmsg->rtmsg_gateway, RTA_DATA(rta[RTA_GATEWAY-1]), 16); | |
1524 | rtmsg->rtmsg_flags |= RTF_GATEWAY; | |
1525 | } | |
1526 | if (rta[RTA_DST-1]) { | |
1527 | if (RTA_PAYLOAD(rta[RTA_DST-1]) < ((r->rtm_dst_len+7)>>3)) | |
1528 | return -EINVAL; | |
1529 | memcpy(&rtmsg->rtmsg_dst, RTA_DATA(rta[RTA_DST-1]), ((r->rtm_dst_len+7)>>3)); | |
1530 | } | |
1531 | if (rta[RTA_SRC-1]) { | |
1532 | if (RTA_PAYLOAD(rta[RTA_SRC-1]) < ((r->rtm_src_len+7)>>3)) | |
1533 | return -EINVAL; | |
1534 | memcpy(&rtmsg->rtmsg_src, RTA_DATA(rta[RTA_SRC-1]), ((r->rtm_src_len+7)>>3)); | |
1535 | } | |
1536 | if (rta[RTA_OIF-1]) { | |
1537 | if (rta[RTA_OIF-1]->rta_len != RTA_LENGTH(sizeof(int))) | |
1538 | return -EINVAL; | |
1539 | memcpy(&rtmsg->rtmsg_ifindex, RTA_DATA(rta[RTA_OIF-1]), sizeof(int)); | |
1540 | } | |
1541 | if (rta[RTA_PRIORITY-1]) { | |
1542 | if (rta[RTA_PRIORITY-1]->rta_len != RTA_LENGTH(4)) | |
1543 | return -EINVAL; | |
1544 | memcpy(&rtmsg->rtmsg_metric, RTA_DATA(rta[RTA_PRIORITY-1]), 4); | |
1545 | } | |
1546 | return 0; | |
1547 | } | |
1548 | ||
1549 | int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
1550 | { | |
1551 | struct rtmsg *r = NLMSG_DATA(nlh); | |
1552 | struct in6_rtmsg rtmsg; | |
1553 | ||
1554 | if (inet6_rtm_to_rtmsg(r, arg, &rtmsg)) | |
1555 | return -EINVAL; | |
0d51aa80 | 1556 | return ip6_route_del(&rtmsg, nlh, arg, &NETLINK_CB(skb)); |
1da177e4 LT |
1557 | } |
1558 | ||
1559 | int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
1560 | { | |
1561 | struct rtmsg *r = NLMSG_DATA(nlh); | |
1562 | struct in6_rtmsg rtmsg; | |
1563 | ||
1564 | if (inet6_rtm_to_rtmsg(r, arg, &rtmsg)) | |
1565 | return -EINVAL; | |
0d51aa80 | 1566 | return ip6_route_add(&rtmsg, nlh, arg, &NETLINK_CB(skb)); |
1da177e4 LT |
1567 | } |
1568 | ||
1569 | struct rt6_rtnl_dump_arg | |
1570 | { | |
1571 | struct sk_buff *skb; | |
1572 | struct netlink_callback *cb; | |
1573 | }; | |
1574 | ||
1575 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
1576 | struct in6_addr *dst, struct in6_addr *src, |
1577 | int iif, int type, u32 pid, u32 seq, | |
1578 | int prefix, unsigned int flags) | |
1da177e4 LT |
1579 | { |
1580 | struct rtmsg *rtm; | |
1581 | struct nlmsghdr *nlh; | |
1582 | unsigned char *b = skb->tail; | |
1583 | struct rta_cacheinfo ci; | |
1584 | ||
1585 | if (prefix) { /* user wants prefix routes only */ | |
1586 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
1587 | /* success since this is not a prefix route */ | |
1588 | return 1; | |
1589 | } | |
1590 | } | |
1591 | ||
b6544c0b | 1592 | nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*rtm), flags); |
1da177e4 LT |
1593 | rtm = NLMSG_DATA(nlh); |
1594 | rtm->rtm_family = AF_INET6; | |
1595 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
1596 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
1597 | rtm->rtm_tos = 0; | |
1598 | rtm->rtm_table = RT_TABLE_MAIN; | |
1599 | if (rt->rt6i_flags&RTF_REJECT) | |
1600 | rtm->rtm_type = RTN_UNREACHABLE; | |
1601 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
1602 | rtm->rtm_type = RTN_LOCAL; | |
1603 | else | |
1604 | rtm->rtm_type = RTN_UNICAST; | |
1605 | rtm->rtm_flags = 0; | |
1606 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
1607 | rtm->rtm_protocol = rt->rt6i_protocol; | |
1608 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
1609 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
1610 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
1611 | rtm->rtm_protocol = RTPROT_KERNEL; | |
1612 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
1613 | rtm->rtm_protocol = RTPROT_RA; | |
1614 | ||
1615 | if (rt->rt6i_flags&RTF_CACHE) | |
1616 | rtm->rtm_flags |= RTM_F_CLONED; | |
1617 | ||
1618 | if (dst) { | |
1619 | RTA_PUT(skb, RTA_DST, 16, dst); | |
1620 | rtm->rtm_dst_len = 128; | |
1621 | } else if (rtm->rtm_dst_len) | |
1622 | RTA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); | |
1623 | #ifdef CONFIG_IPV6_SUBTREES | |
1624 | if (src) { | |
1625 | RTA_PUT(skb, RTA_SRC, 16, src); | |
1626 | rtm->rtm_src_len = 128; | |
1627 | } else if (rtm->rtm_src_len) | |
1628 | RTA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); | |
1629 | #endif | |
1630 | if (iif) | |
1631 | RTA_PUT(skb, RTA_IIF, 4, &iif); | |
1632 | else if (dst) { | |
1633 | struct in6_addr saddr_buf; | |
1634 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) | |
1635 | RTA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); | |
1636 | } | |
1637 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) | |
1638 | goto rtattr_failure; | |
1639 | if (rt->u.dst.neighbour) | |
1640 | RTA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); | |
1641 | if (rt->u.dst.dev) | |
1642 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->rt6i_dev->ifindex); | |
1643 | RTA_PUT(skb, RTA_PRIORITY, 4, &rt->rt6i_metric); | |
1644 | ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse); | |
1645 | if (rt->rt6i_expires) | |
1646 | ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies); | |
1647 | else | |
1648 | ci.rta_expires = 0; | |
1649 | ci.rta_used = rt->u.dst.__use; | |
1650 | ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt); | |
1651 | ci.rta_error = rt->u.dst.error; | |
1652 | ci.rta_id = 0; | |
1653 | ci.rta_ts = 0; | |
1654 | ci.rta_tsage = 0; | |
1655 | RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci); | |
1656 | nlh->nlmsg_len = skb->tail - b; | |
1657 | return skb->len; | |
1658 | ||
1659 | nlmsg_failure: | |
1660 | rtattr_failure: | |
1661 | skb_trim(skb, b - skb->data); | |
1662 | return -1; | |
1663 | } | |
1664 | ||
1665 | static int rt6_dump_route(struct rt6_info *rt, void *p_arg) | |
1666 | { | |
1667 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
1668 | int prefix; | |
1669 | ||
1670 | if (arg->cb->nlh->nlmsg_len >= NLMSG_LENGTH(sizeof(struct rtmsg))) { | |
1671 | struct rtmsg *rtm = NLMSG_DATA(arg->cb->nlh); | |
1672 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; | |
1673 | } else | |
1674 | prefix = 0; | |
1675 | ||
1676 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1677 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 1678 | prefix, NLM_F_MULTI); |
1da177e4 LT |
1679 | } |
1680 | ||
1681 | static int fib6_dump_node(struct fib6_walker_t *w) | |
1682 | { | |
1683 | int res; | |
1684 | struct rt6_info *rt; | |
1685 | ||
1686 | for (rt = w->leaf; rt; rt = rt->u.next) { | |
1687 | res = rt6_dump_route(rt, w->args); | |
1688 | if (res < 0) { | |
1689 | /* Frame is full, suspend walking */ | |
1690 | w->leaf = rt; | |
1691 | return 1; | |
1692 | } | |
1693 | BUG_TRAP(res!=0); | |
1694 | } | |
1695 | w->leaf = NULL; | |
1696 | return 0; | |
1697 | } | |
1698 | ||
1699 | static void fib6_dump_end(struct netlink_callback *cb) | |
1700 | { | |
1701 | struct fib6_walker_t *w = (void*)cb->args[0]; | |
1702 | ||
1703 | if (w) { | |
1704 | cb->args[0] = 0; | |
1705 | fib6_walker_unlink(w); | |
1706 | kfree(w); | |
1707 | } | |
efacfbcb HX |
1708 | cb->done = (void*)cb->args[1]; |
1709 | cb->args[1] = 0; | |
1da177e4 LT |
1710 | } |
1711 | ||
1712 | static int fib6_dump_done(struct netlink_callback *cb) | |
1713 | { | |
1714 | fib6_dump_end(cb); | |
a8f74b22 | 1715 | return cb->done ? cb->done(cb) : 0; |
1da177e4 LT |
1716 | } |
1717 | ||
1718 | int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) | |
1719 | { | |
1720 | struct rt6_rtnl_dump_arg arg; | |
1721 | struct fib6_walker_t *w; | |
1722 | int res; | |
1723 | ||
1724 | arg.skb = skb; | |
1725 | arg.cb = cb; | |
1726 | ||
1727 | w = (void*)cb->args[0]; | |
1728 | if (w == NULL) { | |
1729 | /* New dump: | |
1730 | * | |
1731 | * 1. hook callback destructor. | |
1732 | */ | |
1733 | cb->args[1] = (long)cb->done; | |
1734 | cb->done = fib6_dump_done; | |
1735 | ||
1736 | /* | |
1737 | * 2. allocate and initialize walker. | |
1738 | */ | |
9e147a1c | 1739 | w = kmalloc(sizeof(*w), GFP_ATOMIC); |
1da177e4 LT |
1740 | if (w == NULL) |
1741 | return -ENOMEM; | |
1742 | RT6_TRACE("dump<%p", w); | |
1743 | memset(w, 0, sizeof(*w)); | |
1744 | w->root = &ip6_routing_table; | |
1745 | w->func = fib6_dump_node; | |
1746 | w->args = &arg; | |
1747 | cb->args[0] = (long)w; | |
1748 | read_lock_bh(&rt6_lock); | |
1749 | res = fib6_walk(w); | |
1750 | read_unlock_bh(&rt6_lock); | |
1751 | } else { | |
1752 | w->args = &arg; | |
1753 | read_lock_bh(&rt6_lock); | |
1754 | res = fib6_walk_continue(w); | |
1755 | read_unlock_bh(&rt6_lock); | |
1756 | } | |
1757 | #if RT6_DEBUG >= 3 | |
1758 | if (res <= 0 && skb->len == 0) | |
1759 | RT6_TRACE("%p>dump end\n", w); | |
1760 | #endif | |
1761 | res = res < 0 ? res : skb->len; | |
1762 | /* res < 0 is an error. (really, impossible) | |
1763 | res == 0 means that dump is complete, but skb still can contain data. | |
1764 | res > 0 dump is not complete, but frame is full. | |
1765 | */ | |
1766 | /* Destroy walker, if dump of this table is complete. */ | |
1767 | if (res <= 0) | |
1768 | fib6_dump_end(cb); | |
1769 | return res; | |
1770 | } | |
1771 | ||
1772 | int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) | |
1773 | { | |
1774 | struct rtattr **rta = arg; | |
1775 | int iif = 0; | |
1776 | int err = -ENOBUFS; | |
1777 | struct sk_buff *skb; | |
1778 | struct flowi fl; | |
1779 | struct rt6_info *rt; | |
1780 | ||
1781 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
1782 | if (skb == NULL) | |
1783 | goto out; | |
1784 | ||
1785 | /* Reserve room for dummy headers, this skb can pass | |
1786 | through good chunk of routing engine. | |
1787 | */ | |
1788 | skb->mac.raw = skb->data; | |
1789 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); | |
1790 | ||
1791 | memset(&fl, 0, sizeof(fl)); | |
1792 | if (rta[RTA_SRC-1]) | |
1793 | ipv6_addr_copy(&fl.fl6_src, | |
1794 | (struct in6_addr*)RTA_DATA(rta[RTA_SRC-1])); | |
1795 | if (rta[RTA_DST-1]) | |
1796 | ipv6_addr_copy(&fl.fl6_dst, | |
1797 | (struct in6_addr*)RTA_DATA(rta[RTA_DST-1])); | |
1798 | ||
1799 | if (rta[RTA_IIF-1]) | |
1800 | memcpy(&iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); | |
1801 | ||
1802 | if (iif) { | |
1803 | struct net_device *dev; | |
1804 | dev = __dev_get_by_index(iif); | |
1805 | if (!dev) { | |
1806 | err = -ENODEV; | |
1807 | goto out_free; | |
1808 | } | |
1809 | } | |
1810 | ||
1811 | fl.oif = 0; | |
1812 | if (rta[RTA_OIF-1]) | |
1813 | memcpy(&fl.oif, RTA_DATA(rta[RTA_OIF-1]), sizeof(int)); | |
1814 | ||
1815 | rt = (struct rt6_info*)ip6_route_output(NULL, &fl); | |
1816 | ||
1817 | skb->dst = &rt->u.dst; | |
1818 | ||
1819 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; | |
1820 | err = rt6_fill_node(skb, rt, | |
1821 | &fl.fl6_dst, &fl.fl6_src, | |
1822 | iif, | |
1823 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, | |
0d51aa80 | 1824 | nlh->nlmsg_seq, 0, 0); |
1da177e4 LT |
1825 | if (err < 0) { |
1826 | err = -EMSGSIZE; | |
1827 | goto out_free; | |
1828 | } | |
1829 | ||
1830 | err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); | |
1831 | if (err > 0) | |
1832 | err = 0; | |
1833 | out: | |
1834 | return err; | |
1835 | out_free: | |
1836 | kfree_skb(skb); | |
1837 | goto out; | |
1838 | } | |
1839 | ||
0d51aa80 JHS |
1840 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nlmsghdr *nlh, |
1841 | struct netlink_skb_parms *req) | |
1da177e4 LT |
1842 | { |
1843 | struct sk_buff *skb; | |
1844 | int size = NLMSG_SPACE(sizeof(struct rtmsg)+256); | |
0d51aa80 JHS |
1845 | u32 pid = current->pid; |
1846 | u32 seq = 0; | |
1da177e4 | 1847 | |
0d51aa80 JHS |
1848 | if (req) |
1849 | pid = req->pid; | |
1850 | if (nlh) | |
1851 | seq = nlh->nlmsg_seq; | |
1852 | ||
1da177e4 LT |
1853 | skb = alloc_skb(size, gfp_any()); |
1854 | if (!skb) { | |
ac6d439d | 1855 | netlink_set_err(rtnl, 0, RTNLGRP_IPV6_ROUTE, ENOBUFS); |
1da177e4 LT |
1856 | return; |
1857 | } | |
0d51aa80 | 1858 | if (rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0) < 0) { |
1da177e4 | 1859 | kfree_skb(skb); |
ac6d439d | 1860 | netlink_set_err(rtnl, 0, RTNLGRP_IPV6_ROUTE, EINVAL); |
1da177e4 LT |
1861 | return; |
1862 | } | |
ac6d439d PM |
1863 | NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_ROUTE; |
1864 | netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_ROUTE, gfp_any()); | |
1da177e4 LT |
1865 | } |
1866 | ||
1867 | /* | |
1868 | * /proc | |
1869 | */ | |
1870 | ||
1871 | #ifdef CONFIG_PROC_FS | |
1872 | ||
1873 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
1874 | ||
1875 | struct rt6_proc_arg | |
1876 | { | |
1877 | char *buffer; | |
1878 | int offset; | |
1879 | int length; | |
1880 | int skip; | |
1881 | int len; | |
1882 | }; | |
1883 | ||
1884 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
1885 | { | |
1886 | struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg; | |
1887 | int i; | |
1888 | ||
1889 | if (arg->skip < arg->offset / RT6_INFO_LEN) { | |
1890 | arg->skip++; | |
1891 | return 0; | |
1892 | } | |
1893 | ||
1894 | if (arg->len >= arg->length) | |
1895 | return 0; | |
1896 | ||
1897 | for (i=0; i<16; i++) { | |
1898 | sprintf(arg->buffer + arg->len, "%02x", | |
1899 | rt->rt6i_dst.addr.s6_addr[i]); | |
1900 | arg->len += 2; | |
1901 | } | |
1902 | arg->len += sprintf(arg->buffer + arg->len, " %02x ", | |
1903 | rt->rt6i_dst.plen); | |
1904 | ||
1905 | #ifdef CONFIG_IPV6_SUBTREES | |
1906 | for (i=0; i<16; i++) { | |
1907 | sprintf(arg->buffer + arg->len, "%02x", | |
1908 | rt->rt6i_src.addr.s6_addr[i]); | |
1909 | arg->len += 2; | |
1910 | } | |
1911 | arg->len += sprintf(arg->buffer + arg->len, " %02x ", | |
1912 | rt->rt6i_src.plen); | |
1913 | #else | |
1914 | sprintf(arg->buffer + arg->len, | |
1915 | "00000000000000000000000000000000 00 "); | |
1916 | arg->len += 36; | |
1917 | #endif | |
1918 | ||
1919 | if (rt->rt6i_nexthop) { | |
1920 | for (i=0; i<16; i++) { | |
1921 | sprintf(arg->buffer + arg->len, "%02x", | |
1922 | rt->rt6i_nexthop->primary_key[i]); | |
1923 | arg->len += 2; | |
1924 | } | |
1925 | } else { | |
1926 | sprintf(arg->buffer + arg->len, | |
1927 | "00000000000000000000000000000000"); | |
1928 | arg->len += 32; | |
1929 | } | |
1930 | arg->len += sprintf(arg->buffer + arg->len, | |
1931 | " %08x %08x %08x %08x %8s\n", | |
1932 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
1933 | rt->u.dst.__use, rt->rt6i_flags, | |
1934 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
1935 | return 0; | |
1936 | } | |
1937 | ||
1938 | static int rt6_proc_info(char *buffer, char **start, off_t offset, int length) | |
1939 | { | |
1940 | struct rt6_proc_arg arg; | |
1941 | arg.buffer = buffer; | |
1942 | arg.offset = offset; | |
1943 | arg.length = length; | |
1944 | arg.skip = 0; | |
1945 | arg.len = 0; | |
1946 | ||
1947 | read_lock_bh(&rt6_lock); | |
1948 | fib6_clean_tree(&ip6_routing_table, rt6_info_route, 0, &arg); | |
1949 | read_unlock_bh(&rt6_lock); | |
1950 | ||
1951 | *start = buffer; | |
1952 | if (offset) | |
1953 | *start += offset % RT6_INFO_LEN; | |
1954 | ||
1955 | arg.len -= offset % RT6_INFO_LEN; | |
1956 | ||
1957 | if (arg.len > length) | |
1958 | arg.len = length; | |
1959 | if (arg.len < 0) | |
1960 | arg.len = 0; | |
1961 | ||
1962 | return arg.len; | |
1963 | } | |
1964 | ||
1da177e4 LT |
1965 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
1966 | { | |
1967 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
1968 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
1969 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
1970 | rt6_stats.fib_rt_cache, | |
1971 | atomic_read(&ip6_dst_ops.entries), | |
1972 | rt6_stats.fib_discarded_routes); | |
1973 | ||
1974 | return 0; | |
1975 | } | |
1976 | ||
1977 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
1978 | { | |
1979 | return single_open(file, rt6_stats_seq_show, NULL); | |
1980 | } | |
1981 | ||
1982 | static struct file_operations rt6_stats_seq_fops = { | |
1983 | .owner = THIS_MODULE, | |
1984 | .open = rt6_stats_seq_open, | |
1985 | .read = seq_read, | |
1986 | .llseek = seq_lseek, | |
1987 | .release = single_release, | |
1988 | }; | |
1989 | #endif /* CONFIG_PROC_FS */ | |
1990 | ||
1991 | #ifdef CONFIG_SYSCTL | |
1992 | ||
1993 | static int flush_delay; | |
1994 | ||
1995 | static | |
1996 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
1997 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1998 | { | |
1999 | if (write) { | |
2000 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2001 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); | |
2002 | return 0; | |
2003 | } else | |
2004 | return -EINVAL; | |
2005 | } | |
2006 | ||
2007 | ctl_table ipv6_route_table[] = { | |
2008 | { | |
2009 | .ctl_name = NET_IPV6_ROUTE_FLUSH, | |
2010 | .procname = "flush", | |
2011 | .data = &flush_delay, | |
2012 | .maxlen = sizeof(int), | |
89c8b3a1 | 2013 | .mode = 0200, |
1da177e4 LT |
2014 | .proc_handler = &ipv6_sysctl_rtcache_flush |
2015 | }, | |
2016 | { | |
2017 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2018 | .procname = "gc_thresh", | |
2019 | .data = &ip6_dst_ops.gc_thresh, | |
2020 | .maxlen = sizeof(int), | |
2021 | .mode = 0644, | |
2022 | .proc_handler = &proc_dointvec, | |
2023 | }, | |
2024 | { | |
2025 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2026 | .procname = "max_size", | |
2027 | .data = &ip6_rt_max_size, | |
2028 | .maxlen = sizeof(int), | |
2029 | .mode = 0644, | |
2030 | .proc_handler = &proc_dointvec, | |
2031 | }, | |
2032 | { | |
2033 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2034 | .procname = "gc_min_interval", | |
2035 | .data = &ip6_rt_gc_min_interval, | |
2036 | .maxlen = sizeof(int), | |
2037 | .mode = 0644, | |
2038 | .proc_handler = &proc_dointvec_jiffies, | |
2039 | .strategy = &sysctl_jiffies, | |
2040 | }, | |
2041 | { | |
2042 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2043 | .procname = "gc_timeout", | |
2044 | .data = &ip6_rt_gc_timeout, | |
2045 | .maxlen = sizeof(int), | |
2046 | .mode = 0644, | |
2047 | .proc_handler = &proc_dointvec_jiffies, | |
2048 | .strategy = &sysctl_jiffies, | |
2049 | }, | |
2050 | { | |
2051 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2052 | .procname = "gc_interval", | |
2053 | .data = &ip6_rt_gc_interval, | |
2054 | .maxlen = sizeof(int), | |
2055 | .mode = 0644, | |
2056 | .proc_handler = &proc_dointvec_jiffies, | |
2057 | .strategy = &sysctl_jiffies, | |
2058 | }, | |
2059 | { | |
2060 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2061 | .procname = "gc_elasticity", | |
2062 | .data = &ip6_rt_gc_elasticity, | |
2063 | .maxlen = sizeof(int), | |
2064 | .mode = 0644, | |
2065 | .proc_handler = &proc_dointvec_jiffies, | |
2066 | .strategy = &sysctl_jiffies, | |
2067 | }, | |
2068 | { | |
2069 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2070 | .procname = "mtu_expires", | |
2071 | .data = &ip6_rt_mtu_expires, | |
2072 | .maxlen = sizeof(int), | |
2073 | .mode = 0644, | |
2074 | .proc_handler = &proc_dointvec_jiffies, | |
2075 | .strategy = &sysctl_jiffies, | |
2076 | }, | |
2077 | { | |
2078 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2079 | .procname = "min_adv_mss", | |
2080 | .data = &ip6_rt_min_advmss, | |
2081 | .maxlen = sizeof(int), | |
2082 | .mode = 0644, | |
2083 | .proc_handler = &proc_dointvec_jiffies, | |
2084 | .strategy = &sysctl_jiffies, | |
2085 | }, | |
2086 | { | |
2087 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2088 | .procname = "gc_min_interval_ms", | |
2089 | .data = &ip6_rt_gc_min_interval, | |
2090 | .maxlen = sizeof(int), | |
2091 | .mode = 0644, | |
2092 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2093 | .strategy = &sysctl_ms_jiffies, | |
2094 | }, | |
2095 | { .ctl_name = 0 } | |
2096 | }; | |
2097 | ||
2098 | #endif | |
2099 | ||
2100 | void __init ip6_route_init(void) | |
2101 | { | |
2102 | struct proc_dir_entry *p; | |
2103 | ||
2104 | ip6_dst_ops.kmem_cachep = kmem_cache_create("ip6_dst_cache", | |
2105 | sizeof(struct rt6_info), | |
2106 | 0, SLAB_HWCACHE_ALIGN, | |
2107 | NULL, NULL); | |
2108 | if (!ip6_dst_ops.kmem_cachep) | |
2109 | panic("cannot create ip6_dst_cache"); | |
2110 | ||
2111 | fib6_init(); | |
2112 | #ifdef CONFIG_PROC_FS | |
2113 | p = proc_net_create("ipv6_route", 0, rt6_proc_info); | |
2114 | if (p) | |
2115 | p->owner = THIS_MODULE; | |
2116 | ||
2117 | proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2118 | #endif | |
2119 | #ifdef CONFIG_XFRM | |
2120 | xfrm6_init(); | |
2121 | #endif | |
2122 | } | |
2123 | ||
2124 | void ip6_route_cleanup(void) | |
2125 | { | |
2126 | #ifdef CONFIG_PROC_FS | |
2127 | proc_net_remove("ipv6_route"); | |
2128 | proc_net_remove("rt6_stats"); | |
2129 | #endif | |
2130 | #ifdef CONFIG_XFRM | |
2131 | xfrm6_fini(); | |
2132 | #endif | |
2133 | rt6_ifdown(NULL); | |
2134 | fib6_gc_cleanup(); | |
2135 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2136 | } |