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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. | |
c0bece9f YH |
25 | * Ville Nuorvala |
26 | * Fixed routing subtrees. | |
1da177e4 LT |
27 | */ |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 LT |
30 | #include <linux/errno.h> |
31 | #include <linux/types.h> | |
32 | #include <linux/times.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/sockios.h> | |
35 | #include <linux/net.h> | |
36 | #include <linux/route.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/in6.h> | |
39 | #include <linux/init.h> | |
1da177e4 LT |
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> | |
8d71740c | 57 | #include <net/netevent.h> |
21713ebc | 58 | #include <net/netlink.h> |
1da177e4 LT |
59 | |
60 | #include <asm/uaccess.h> | |
61 | ||
62 | #ifdef CONFIG_SYSCTL | |
63 | #include <linux/sysctl.h> | |
64 | #endif | |
65 | ||
66 | /* Set to 3 to get tracing. */ | |
67 | #define RT6_DEBUG 2 | |
68 | ||
69 | #if RT6_DEBUG >= 3 | |
70 | #define RDBG(x) printk x | |
71 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
72 | #else | |
73 | #define RDBG(x) | |
74 | #define RT6_TRACE(x...) do { ; } while (0) | |
75 | #endif | |
76 | ||
519fbd87 | 77 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 LT |
78 | |
79 | static int ip6_rt_max_size = 4096; | |
80 | static int ip6_rt_gc_min_interval = HZ / 2; | |
81 | static int ip6_rt_gc_timeout = 60*HZ; | |
82 | int ip6_rt_gc_interval = 30*HZ; | |
83 | static int ip6_rt_gc_elasticity = 9; | |
84 | static int ip6_rt_mtu_expires = 10*60*HZ; | |
85 | static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
86 | ||
87 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); | |
88 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
89 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
90 | static void ip6_dst_destroy(struct dst_entry *); | |
91 | static void ip6_dst_ifdown(struct dst_entry *, | |
92 | struct net_device *dev, int how); | |
93 | static int ip6_dst_gc(void); | |
94 | ||
95 | static int ip6_pkt_discard(struct sk_buff *skb); | |
96 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
97 | static void ip6_link_failure(struct sk_buff *skb); | |
98 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
99 | ||
70ceb4f5 YH |
100 | #ifdef CONFIG_IPV6_ROUTE_INFO |
101 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
102 | struct in6_addr *gwaddr, int ifindex, | |
103 | unsigned pref); | |
104 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
105 | struct in6_addr *gwaddr, int ifindex); | |
106 | #endif | |
107 | ||
1da177e4 LT |
108 | static struct dst_ops ip6_dst_ops = { |
109 | .family = AF_INET6, | |
110 | .protocol = __constant_htons(ETH_P_IPV6), | |
111 | .gc = ip6_dst_gc, | |
112 | .gc_thresh = 1024, | |
113 | .check = ip6_dst_check, | |
114 | .destroy = ip6_dst_destroy, | |
115 | .ifdown = ip6_dst_ifdown, | |
116 | .negative_advice = ip6_negative_advice, | |
117 | .link_failure = ip6_link_failure, | |
118 | .update_pmtu = ip6_rt_update_pmtu, | |
119 | .entry_size = sizeof(struct rt6_info), | |
120 | }; | |
121 | ||
122 | struct rt6_info ip6_null_entry = { | |
123 | .u = { | |
124 | .dst = { | |
125 | .__refcnt = ATOMIC_INIT(1), | |
126 | .__use = 1, | |
127 | .dev = &loopback_dev, | |
128 | .obsolete = -1, | |
129 | .error = -ENETUNREACH, | |
130 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
131 | .input = ip6_pkt_discard, | |
132 | .output = ip6_pkt_discard_out, | |
133 | .ops = &ip6_dst_ops, | |
134 | .path = (struct dst_entry*)&ip6_null_entry, | |
135 | } | |
136 | }, | |
137 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
138 | .rt6i_metric = ~(u32) 0, | |
139 | .rt6i_ref = ATOMIC_INIT(1), | |
140 | }; | |
141 | ||
101367c2 TG |
142 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
143 | ||
6723ab54 DM |
144 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
145 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
146 | static int ip6_pkt_blk_hole(struct sk_buff *skb); | |
147 | ||
101367c2 TG |
148 | struct rt6_info ip6_prohibit_entry = { |
149 | .u = { | |
150 | .dst = { | |
151 | .__refcnt = ATOMIC_INIT(1), | |
152 | .__use = 1, | |
153 | .dev = &loopback_dev, | |
154 | .obsolete = -1, | |
155 | .error = -EACCES, | |
156 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
157 | .input = ip6_pkt_prohibit, |
158 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
159 | .ops = &ip6_dst_ops, |
160 | .path = (struct dst_entry*)&ip6_prohibit_entry, | |
161 | } | |
162 | }, | |
163 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
164 | .rt6i_metric = ~(u32) 0, | |
165 | .rt6i_ref = ATOMIC_INIT(1), | |
166 | }; | |
167 | ||
168 | struct rt6_info ip6_blk_hole_entry = { | |
169 | .u = { | |
170 | .dst = { | |
171 | .__refcnt = ATOMIC_INIT(1), | |
172 | .__use = 1, | |
173 | .dev = &loopback_dev, | |
174 | .obsolete = -1, | |
175 | .error = -EINVAL, | |
176 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
9ce8ade0 TG |
177 | .input = ip6_pkt_blk_hole, |
178 | .output = ip6_pkt_blk_hole, | |
101367c2 TG |
179 | .ops = &ip6_dst_ops, |
180 | .path = (struct dst_entry*)&ip6_blk_hole_entry, | |
181 | } | |
182 | }, | |
183 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
184 | .rt6i_metric = ~(u32) 0, | |
185 | .rt6i_ref = ATOMIC_INIT(1), | |
186 | }; | |
187 | ||
188 | #endif | |
189 | ||
1da177e4 LT |
190 | /* allocate dst with ip6_dst_ops */ |
191 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
192 | { | |
193 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
194 | } | |
195 | ||
196 | static void ip6_dst_destroy(struct dst_entry *dst) | |
197 | { | |
198 | struct rt6_info *rt = (struct rt6_info *)dst; | |
199 | struct inet6_dev *idev = rt->rt6i_idev; | |
200 | ||
201 | if (idev != NULL) { | |
202 | rt->rt6i_idev = NULL; | |
203 | in6_dev_put(idev); | |
204 | } | |
205 | } | |
206 | ||
207 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
208 | int how) | |
209 | { | |
210 | struct rt6_info *rt = (struct rt6_info *)dst; | |
211 | struct inet6_dev *idev = rt->rt6i_idev; | |
212 | ||
213 | if (dev != &loopback_dev && idev != NULL && idev->dev == dev) { | |
214 | struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev); | |
215 | if (loopback_idev != NULL) { | |
216 | rt->rt6i_idev = loopback_idev; | |
217 | in6_dev_put(idev); | |
218 | } | |
219 | } | |
220 | } | |
221 | ||
222 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
223 | { | |
224 | return (rt->rt6i_flags & RTF_EXPIRES && | |
225 | time_after(jiffies, rt->rt6i_expires)); | |
226 | } | |
227 | ||
c71099ac TG |
228 | static inline int rt6_need_strict(struct in6_addr *daddr) |
229 | { | |
230 | return (ipv6_addr_type(daddr) & | |
231 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
232 | } | |
233 | ||
1da177e4 | 234 | /* |
c71099ac | 235 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
236 | */ |
237 | ||
238 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
239 | int oif, | |
240 | int strict) | |
241 | { | |
242 | struct rt6_info *local = NULL; | |
243 | struct rt6_info *sprt; | |
244 | ||
245 | if (oif) { | |
246 | for (sprt = rt; sprt; sprt = sprt->u.next) { | |
247 | struct net_device *dev = sprt->rt6i_dev; | |
248 | if (dev->ifindex == oif) | |
249 | return sprt; | |
250 | if (dev->flags & IFF_LOOPBACK) { | |
251 | if (sprt->rt6i_idev == NULL || | |
252 | sprt->rt6i_idev->dev->ifindex != oif) { | |
253 | if (strict && oif) | |
254 | continue; | |
255 | if (local && (!oif || | |
256 | local->rt6i_idev->dev->ifindex == oif)) | |
257 | continue; | |
258 | } | |
259 | local = sprt; | |
260 | } | |
261 | } | |
262 | ||
263 | if (local) | |
264 | return local; | |
265 | ||
266 | if (strict) | |
267 | return &ip6_null_entry; | |
268 | } | |
269 | return rt; | |
270 | } | |
271 | ||
27097255 YH |
272 | #ifdef CONFIG_IPV6_ROUTER_PREF |
273 | static void rt6_probe(struct rt6_info *rt) | |
274 | { | |
275 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
276 | /* | |
277 | * Okay, this does not seem to be appropriate | |
278 | * for now, however, we need to check if it | |
279 | * is really so; aka Router Reachability Probing. | |
280 | * | |
281 | * Router Reachability Probe MUST be rate-limited | |
282 | * to no more than one per minute. | |
283 | */ | |
284 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
285 | return; | |
286 | read_lock_bh(&neigh->lock); | |
287 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 288 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
289 | struct in6_addr mcaddr; |
290 | struct in6_addr *target; | |
291 | ||
292 | neigh->updated = jiffies; | |
293 | read_unlock_bh(&neigh->lock); | |
294 | ||
295 | target = (struct in6_addr *)&neigh->primary_key; | |
296 | addrconf_addr_solict_mult(target, &mcaddr); | |
297 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
298 | } else | |
299 | read_unlock_bh(&neigh->lock); | |
300 | } | |
301 | #else | |
302 | static inline void rt6_probe(struct rt6_info *rt) | |
303 | { | |
304 | return; | |
305 | } | |
306 | #endif | |
307 | ||
1da177e4 | 308 | /* |
554cfb7e | 309 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 310 | */ |
554cfb7e YH |
311 | static int inline rt6_check_dev(struct rt6_info *rt, int oif) |
312 | { | |
313 | struct net_device *dev = rt->rt6i_dev; | |
314 | if (!oif || dev->ifindex == oif) | |
315 | return 2; | |
316 | if ((dev->flags & IFF_LOOPBACK) && | |
317 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
318 | return 1; | |
319 | return 0; | |
320 | } | |
1da177e4 | 321 | |
554cfb7e | 322 | static int inline rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 323 | { |
554cfb7e YH |
324 | struct neighbour *neigh = rt->rt6i_nexthop; |
325 | int m = 0; | |
4d0c5911 YH |
326 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
327 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
328 | m = 1; | |
329 | else if (neigh) { | |
554cfb7e YH |
330 | read_lock_bh(&neigh->lock); |
331 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 332 | m = 2; |
ea73ee23 YH |
333 | else if (!(neigh->nud_state & NUD_FAILED)) |
334 | m = 1; | |
554cfb7e | 335 | read_unlock_bh(&neigh->lock); |
1da177e4 | 336 | } |
554cfb7e | 337 | return m; |
1da177e4 LT |
338 | } |
339 | ||
554cfb7e YH |
340 | static int rt6_score_route(struct rt6_info *rt, int oif, |
341 | int strict) | |
1da177e4 | 342 | { |
4d0c5911 YH |
343 | int m, n; |
344 | ||
345 | m = rt6_check_dev(rt, oif); | |
77d16f45 | 346 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 347 | return -1; |
ebacaaa0 YH |
348 | #ifdef CONFIG_IPV6_ROUTER_PREF |
349 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
350 | #endif | |
4d0c5911 | 351 | n = rt6_check_neigh(rt); |
557e92ef | 352 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
353 | return -1; |
354 | return m; | |
355 | } | |
356 | ||
357 | static struct rt6_info *rt6_select(struct rt6_info **head, int oif, | |
358 | int strict) | |
359 | { | |
360 | struct rt6_info *match = NULL, *last = NULL; | |
361 | struct rt6_info *rt, *rt0 = *head; | |
362 | u32 metric; | |
363 | int mpri = -1; | |
1da177e4 | 364 | |
554cfb7e YH |
365 | RT6_TRACE("%s(head=%p(*head=%p), oif=%d)\n", |
366 | __FUNCTION__, head, head ? *head : NULL, oif); | |
1da177e4 | 367 | |
554cfb7e | 368 | for (rt = rt0, metric = rt0->rt6i_metric; |
c302e6d5 | 369 | rt && rt->rt6i_metric == metric && (!last || rt != rt0); |
554cfb7e YH |
370 | rt = rt->u.next) { |
371 | int m; | |
1da177e4 | 372 | |
554cfb7e | 373 | if (rt6_check_expired(rt)) |
1da177e4 LT |
374 | continue; |
375 | ||
554cfb7e YH |
376 | last = rt; |
377 | ||
378 | m = rt6_score_route(rt, oif, strict); | |
379 | if (m < 0) | |
1da177e4 | 380 | continue; |
1da177e4 | 381 | |
554cfb7e | 382 | if (m > mpri) { |
ea659e07 YH |
383 | if (strict & RT6_LOOKUP_F_REACHABLE) |
384 | rt6_probe(match); | |
554cfb7e | 385 | match = rt; |
1da177e4 | 386 | mpri = m; |
ea659e07 | 387 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { |
27097255 | 388 | rt6_probe(rt); |
1da177e4 LT |
389 | } |
390 | } | |
391 | ||
554cfb7e | 392 | if (!match && |
77d16f45 | 393 | (strict & RT6_LOOKUP_F_REACHABLE) && |
554cfb7e YH |
394 | last && last != rt0) { |
395 | /* no entries matched; do round-robin */ | |
34af946a | 396 | static DEFINE_SPINLOCK(lock); |
c302e6d5 | 397 | spin_lock(&lock); |
554cfb7e YH |
398 | *head = rt0->u.next; |
399 | rt0->u.next = last->u.next; | |
400 | last->u.next = rt0; | |
c302e6d5 | 401 | spin_unlock(&lock); |
1da177e4 | 402 | } |
1da177e4 | 403 | |
554cfb7e YH |
404 | RT6_TRACE("%s() => %p, score=%d\n", |
405 | __FUNCTION__, match, mpri); | |
1da177e4 | 406 | |
554cfb7e | 407 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
408 | } |
409 | ||
70ceb4f5 YH |
410 | #ifdef CONFIG_IPV6_ROUTE_INFO |
411 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
412 | struct in6_addr *gwaddr) | |
413 | { | |
414 | struct route_info *rinfo = (struct route_info *) opt; | |
415 | struct in6_addr prefix_buf, *prefix; | |
416 | unsigned int pref; | |
417 | u32 lifetime; | |
418 | struct rt6_info *rt; | |
419 | ||
420 | if (len < sizeof(struct route_info)) { | |
421 | return -EINVAL; | |
422 | } | |
423 | ||
424 | /* Sanity check for prefix_len and length */ | |
425 | if (rinfo->length > 3) { | |
426 | return -EINVAL; | |
427 | } else if (rinfo->prefix_len > 128) { | |
428 | return -EINVAL; | |
429 | } else if (rinfo->prefix_len > 64) { | |
430 | if (rinfo->length < 2) { | |
431 | return -EINVAL; | |
432 | } | |
433 | } else if (rinfo->prefix_len > 0) { | |
434 | if (rinfo->length < 1) { | |
435 | return -EINVAL; | |
436 | } | |
437 | } | |
438 | ||
439 | pref = rinfo->route_pref; | |
440 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
441 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
442 | ||
443 | lifetime = htonl(rinfo->lifetime); | |
444 | if (lifetime == 0xffffffff) { | |
445 | /* infinity */ | |
446 | } else if (lifetime > 0x7fffffff/HZ) { | |
447 | /* Avoid arithmetic overflow */ | |
448 | lifetime = 0x7fffffff/HZ - 1; | |
449 | } | |
450 | ||
451 | if (rinfo->length == 3) | |
452 | prefix = (struct in6_addr *)rinfo->prefix; | |
453 | else { | |
454 | /* this function is safe */ | |
455 | ipv6_addr_prefix(&prefix_buf, | |
456 | (struct in6_addr *)rinfo->prefix, | |
457 | rinfo->prefix_len); | |
458 | prefix = &prefix_buf; | |
459 | } | |
460 | ||
461 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
462 | ||
463 | if (rt && !lifetime) { | |
e0a1ad73 | 464 | ip6_del_rt(rt); |
70ceb4f5 YH |
465 | rt = NULL; |
466 | } | |
467 | ||
468 | if (!rt && lifetime) | |
469 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
470 | pref); | |
471 | else if (rt) | |
472 | rt->rt6i_flags = RTF_ROUTEINFO | | |
473 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
474 | ||
475 | if (rt) { | |
476 | if (lifetime == 0xffffffff) { | |
477 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
478 | } else { | |
479 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
480 | rt->rt6i_flags |= RTF_EXPIRES; | |
481 | } | |
482 | dst_release(&rt->u.dst); | |
483 | } | |
484 | return 0; | |
485 | } | |
486 | #endif | |
487 | ||
982f56f3 YH |
488 | #define BACKTRACK(saddr) \ |
489 | do { \ | |
490 | if (rt == &ip6_null_entry) { \ | |
491 | struct fib6_node *pn; \ | |
e0eda7bb | 492 | while (1) { \ |
982f56f3 YH |
493 | if (fn->fn_flags & RTN_TL_ROOT) \ |
494 | goto out; \ | |
495 | pn = fn->parent; \ | |
496 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
497 | fn = fib6_lookup(pn->subtree, NULL, saddr); \ | |
498 | else \ | |
499 | fn = pn; \ | |
500 | if (fn->fn_flags & RTN_RTINFO) \ | |
501 | goto restart; \ | |
c71099ac | 502 | } \ |
c71099ac | 503 | } \ |
982f56f3 | 504 | } while(0) |
c71099ac TG |
505 | |
506 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
507 | struct flowi *fl, int flags) | |
1da177e4 LT |
508 | { |
509 | struct fib6_node *fn; | |
510 | struct rt6_info *rt; | |
511 | ||
c71099ac TG |
512 | read_lock_bh(&table->tb6_lock); |
513 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
514 | restart: | |
515 | rt = fn->leaf; | |
77d16f45 | 516 | rt = rt6_device_match(rt, fl->oif, flags); |
982f56f3 | 517 | BACKTRACK(&fl->fl6_src); |
c71099ac | 518 | out: |
33cc4896 | 519 | dst_hold(&rt->u.dst); |
c71099ac | 520 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
521 | |
522 | rt->u.dst.lastuse = jiffies; | |
c71099ac TG |
523 | rt->u.dst.__use++; |
524 | ||
525 | return rt; | |
526 | ||
527 | } | |
528 | ||
529 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, | |
530 | int oif, int strict) | |
531 | { | |
532 | struct flowi fl = { | |
533 | .oif = oif, | |
534 | .nl_u = { | |
535 | .ip6_u = { | |
536 | .daddr = *daddr, | |
c71099ac TG |
537 | }, |
538 | }, | |
539 | }; | |
540 | struct dst_entry *dst; | |
77d16f45 | 541 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 542 | |
adaa70bb TG |
543 | if (saddr) { |
544 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
545 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
546 | } | |
547 | ||
c71099ac TG |
548 | dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup); |
549 | if (dst->error == 0) | |
550 | return (struct rt6_info *) dst; | |
551 | ||
552 | dst_release(dst); | |
553 | ||
1da177e4 LT |
554 | return NULL; |
555 | } | |
556 | ||
c71099ac | 557 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
558 | It takes new route entry, the addition fails by any reason the |
559 | route is freed. In any case, if caller does not hold it, it may | |
560 | be destroyed. | |
561 | */ | |
562 | ||
86872cb5 | 563 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
564 | { |
565 | int err; | |
c71099ac | 566 | struct fib6_table *table; |
1da177e4 | 567 | |
c71099ac TG |
568 | table = rt->rt6i_table; |
569 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 570 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 571 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
572 | |
573 | return err; | |
574 | } | |
575 | ||
40e22e8f TG |
576 | int ip6_ins_rt(struct rt6_info *rt) |
577 | { | |
86872cb5 | 578 | return __ip6_ins_rt(rt, NULL); |
40e22e8f TG |
579 | } |
580 | ||
95a9a5ba YH |
581 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
582 | struct in6_addr *saddr) | |
1da177e4 | 583 | { |
1da177e4 LT |
584 | struct rt6_info *rt; |
585 | ||
586 | /* | |
587 | * Clone the route. | |
588 | */ | |
589 | ||
590 | rt = ip6_rt_copy(ort); | |
591 | ||
592 | if (rt) { | |
58c4fb86 YH |
593 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
594 | if (rt->rt6i_dst.plen != 128 && | |
595 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
596 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 597 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 598 | } |
1da177e4 | 599 | |
58c4fb86 | 600 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
601 | rt->rt6i_dst.plen = 128; |
602 | rt->rt6i_flags |= RTF_CACHE; | |
603 | rt->u.dst.flags |= DST_HOST; | |
604 | ||
605 | #ifdef CONFIG_IPV6_SUBTREES | |
606 | if (rt->rt6i_src.plen && saddr) { | |
607 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
608 | rt->rt6i_src.plen = 128; | |
609 | } | |
610 | #endif | |
611 | ||
612 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
613 | ||
95a9a5ba | 614 | } |
1da177e4 | 615 | |
95a9a5ba YH |
616 | return rt; |
617 | } | |
1da177e4 | 618 | |
299d9939 YH |
619 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
620 | { | |
621 | struct rt6_info *rt = ip6_rt_copy(ort); | |
622 | if (rt) { | |
623 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
624 | rt->rt6i_dst.plen = 128; | |
625 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
626 | rt->u.dst.flags |= DST_HOST; |
627 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
628 | } | |
629 | return rt; | |
630 | } | |
631 | ||
8ce11e6a AB |
632 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, |
633 | struct flowi *fl, int flags) | |
1da177e4 LT |
634 | { |
635 | struct fib6_node *fn; | |
519fbd87 | 636 | struct rt6_info *rt, *nrt; |
c71099ac | 637 | int strict = 0; |
1da177e4 | 638 | int attempts = 3; |
519fbd87 | 639 | int err; |
ea659e07 | 640 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 641 | |
77d16f45 | 642 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
643 | |
644 | relookup: | |
c71099ac | 645 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 646 | |
8238dd06 | 647 | restart_2: |
c71099ac | 648 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
649 | |
650 | restart: | |
c71099ac | 651 | rt = rt6_select(&fn->leaf, fl->iif, strict | reachable); |
982f56f3 | 652 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
653 | if (rt == &ip6_null_entry || |
654 | rt->rt6i_flags & RTF_CACHE) | |
1ddef044 | 655 | goto out; |
1da177e4 | 656 | |
fb9de91e | 657 | dst_hold(&rt->u.dst); |
c71099ac | 658 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 659 | |
519fbd87 | 660 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 661 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
662 | else { |
663 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 664 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
665 | #else |
666 | goto out2; | |
667 | #endif | |
668 | } | |
e40cf353 | 669 | |
519fbd87 YH |
670 | dst_release(&rt->u.dst); |
671 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 672 | |
519fbd87 YH |
673 | dst_hold(&rt->u.dst); |
674 | if (nrt) { | |
40e22e8f | 675 | err = ip6_ins_rt(nrt); |
519fbd87 | 676 | if (!err) |
1da177e4 | 677 | goto out2; |
1da177e4 | 678 | } |
1da177e4 | 679 | |
519fbd87 YH |
680 | if (--attempts <= 0) |
681 | goto out2; | |
682 | ||
683 | /* | |
c71099ac | 684 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
685 | * released someone could insert this route. Relookup. |
686 | */ | |
687 | dst_release(&rt->u.dst); | |
688 | goto relookup; | |
689 | ||
690 | out: | |
8238dd06 YH |
691 | if (reachable) { |
692 | reachable = 0; | |
693 | goto restart_2; | |
694 | } | |
519fbd87 | 695 | dst_hold(&rt->u.dst); |
c71099ac | 696 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
697 | out2: |
698 | rt->u.dst.lastuse = jiffies; | |
699 | rt->u.dst.__use++; | |
c71099ac TG |
700 | |
701 | return rt; | |
1da177e4 LT |
702 | } |
703 | ||
c71099ac TG |
704 | void ip6_route_input(struct sk_buff *skb) |
705 | { | |
706 | struct ipv6hdr *iph = skb->nh.ipv6h; | |
adaa70bb | 707 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
708 | struct flowi fl = { |
709 | .iif = skb->dev->ifindex, | |
710 | .nl_u = { | |
711 | .ip6_u = { | |
712 | .daddr = iph->daddr, | |
713 | .saddr = iph->saddr, | |
267935b1 | 714 | #ifdef CONFIG_IPV6_ROUTE_FWMARK |
82e91ffe | 715 | .fwmark = skb->mark, |
267935b1 | 716 | #endif |
90bcaf7b | 717 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
718 | }, |
719 | }, | |
720 | .proto = iph->nexthdr, | |
721 | }; | |
adaa70bb TG |
722 | |
723 | if (rt6_need_strict(&iph->daddr)) | |
724 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac TG |
725 | |
726 | skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input); | |
727 | } | |
728 | ||
729 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
730 | struct flowi *fl, int flags) | |
1da177e4 LT |
731 | { |
732 | struct fib6_node *fn; | |
519fbd87 | 733 | struct rt6_info *rt, *nrt; |
c71099ac | 734 | int strict = 0; |
1da177e4 | 735 | int attempts = 3; |
519fbd87 | 736 | int err; |
ea659e07 | 737 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 738 | |
77d16f45 | 739 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
740 | |
741 | relookup: | |
c71099ac | 742 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 743 | |
8238dd06 | 744 | restart_2: |
c71099ac | 745 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
746 | |
747 | restart: | |
8238dd06 | 748 | rt = rt6_select(&fn->leaf, fl->oif, strict | reachable); |
982f56f3 | 749 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
750 | if (rt == &ip6_null_entry || |
751 | rt->rt6i_flags & RTF_CACHE) | |
1da177e4 | 752 | goto out; |
1da177e4 | 753 | |
fb9de91e | 754 | dst_hold(&rt->u.dst); |
c71099ac | 755 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 756 | |
519fbd87 | 757 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
e40cf353 | 758 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
759 | else { |
760 | #if CLONE_OFFLINK_ROUTE | |
761 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); | |
762 | #else | |
763 | goto out2; | |
764 | #endif | |
765 | } | |
1da177e4 | 766 | |
519fbd87 YH |
767 | dst_release(&rt->u.dst); |
768 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 769 | |
519fbd87 YH |
770 | dst_hold(&rt->u.dst); |
771 | if (nrt) { | |
40e22e8f | 772 | err = ip6_ins_rt(nrt); |
519fbd87 | 773 | if (!err) |
1da177e4 | 774 | goto out2; |
1da177e4 | 775 | } |
e40cf353 | 776 | |
519fbd87 YH |
777 | if (--attempts <= 0) |
778 | goto out2; | |
779 | ||
780 | /* | |
c71099ac | 781 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
782 | * released someone could insert this route. Relookup. |
783 | */ | |
784 | dst_release(&rt->u.dst); | |
785 | goto relookup; | |
786 | ||
787 | out: | |
8238dd06 YH |
788 | if (reachable) { |
789 | reachable = 0; | |
790 | goto restart_2; | |
791 | } | |
519fbd87 | 792 | dst_hold(&rt->u.dst); |
c71099ac | 793 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
794 | out2: |
795 | rt->u.dst.lastuse = jiffies; | |
796 | rt->u.dst.__use++; | |
c71099ac TG |
797 | return rt; |
798 | } | |
799 | ||
800 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
801 | { | |
802 | int flags = 0; | |
803 | ||
804 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 805 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 806 | |
adaa70bb TG |
807 | if (!ipv6_addr_any(&fl->fl6_src)) |
808 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
809 | ||
c71099ac | 810 | return fib6_rule_lookup(fl, flags, ip6_pol_route_output); |
1da177e4 LT |
811 | } |
812 | ||
813 | ||
814 | /* | |
815 | * Destination cache support functions | |
816 | */ | |
817 | ||
818 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
819 | { | |
820 | struct rt6_info *rt; | |
821 | ||
822 | rt = (struct rt6_info *) dst; | |
823 | ||
824 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
825 | return dst; | |
826 | ||
827 | return NULL; | |
828 | } | |
829 | ||
830 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
831 | { | |
832 | struct rt6_info *rt = (struct rt6_info *) dst; | |
833 | ||
834 | if (rt) { | |
835 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 836 | ip6_del_rt(rt); |
1da177e4 LT |
837 | else |
838 | dst_release(dst); | |
839 | } | |
840 | return NULL; | |
841 | } | |
842 | ||
843 | static void ip6_link_failure(struct sk_buff *skb) | |
844 | { | |
845 | struct rt6_info *rt; | |
846 | ||
847 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
848 | ||
849 | rt = (struct rt6_info *) skb->dst; | |
850 | if (rt) { | |
851 | if (rt->rt6i_flags&RTF_CACHE) { | |
852 | dst_set_expires(&rt->u.dst, 0); | |
853 | rt->rt6i_flags |= RTF_EXPIRES; | |
854 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
855 | rt->rt6i_node->fn_sernum = -1; | |
856 | } | |
857 | } | |
858 | ||
859 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
860 | { | |
861 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
862 | ||
863 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
864 | rt6->rt6i_flags |= RTF_MODIFIED; | |
865 | if (mtu < IPV6_MIN_MTU) { | |
866 | mtu = IPV6_MIN_MTU; | |
867 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
868 | } | |
869 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 870 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
871 | } |
872 | } | |
873 | ||
1da177e4 LT |
874 | static int ipv6_get_mtu(struct net_device *dev); |
875 | ||
876 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
877 | { | |
878 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
879 | ||
880 | if (mtu < ip6_rt_min_advmss) | |
881 | mtu = ip6_rt_min_advmss; | |
882 | ||
883 | /* | |
884 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and | |
885 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
886 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
887 | * rely only on pmtu discovery" | |
888 | */ | |
889 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
890 | mtu = IPV6_MAXPLEN; | |
891 | return mtu; | |
892 | } | |
893 | ||
5d0bbeeb | 894 | static struct dst_entry *ndisc_dst_gc_list; |
8ce11e6a | 895 | static DEFINE_SPINLOCK(ndisc_lock); |
5d0bbeeb | 896 | |
1da177e4 LT |
897 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, |
898 | struct neighbour *neigh, | |
899 | struct in6_addr *addr, | |
900 | int (*output)(struct sk_buff *)) | |
901 | { | |
902 | struct rt6_info *rt; | |
903 | struct inet6_dev *idev = in6_dev_get(dev); | |
904 | ||
905 | if (unlikely(idev == NULL)) | |
906 | return NULL; | |
907 | ||
908 | rt = ip6_dst_alloc(); | |
909 | if (unlikely(rt == NULL)) { | |
910 | in6_dev_put(idev); | |
911 | goto out; | |
912 | } | |
913 | ||
914 | dev_hold(dev); | |
915 | if (neigh) | |
916 | neigh_hold(neigh); | |
917 | else | |
918 | neigh = ndisc_get_neigh(dev, addr); | |
919 | ||
920 | rt->rt6i_dev = dev; | |
921 | rt->rt6i_idev = idev; | |
922 | rt->rt6i_nexthop = neigh; | |
923 | atomic_set(&rt->u.dst.__refcnt, 1); | |
924 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
925 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
926 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
927 | rt->u.dst.output = output; | |
928 | ||
929 | #if 0 /* there's no chance to use these for ndisc */ | |
930 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST | |
931 | ? DST_HOST | |
932 | : 0; | |
933 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
934 | rt->rt6i_dst.plen = 128; | |
935 | #endif | |
936 | ||
5d0bbeeb | 937 | spin_lock_bh(&ndisc_lock); |
1da177e4 LT |
938 | rt->u.dst.next = ndisc_dst_gc_list; |
939 | ndisc_dst_gc_list = &rt->u.dst; | |
5d0bbeeb | 940 | spin_unlock_bh(&ndisc_lock); |
1da177e4 LT |
941 | |
942 | fib6_force_start_gc(); | |
943 | ||
944 | out: | |
945 | return (struct dst_entry *)rt; | |
946 | } | |
947 | ||
948 | int ndisc_dst_gc(int *more) | |
949 | { | |
950 | struct dst_entry *dst, *next, **pprev; | |
951 | int freed; | |
952 | ||
953 | next = NULL; | |
5d0bbeeb TG |
954 | freed = 0; |
955 | ||
956 | spin_lock_bh(&ndisc_lock); | |
1da177e4 | 957 | pprev = &ndisc_dst_gc_list; |
5d0bbeeb | 958 | |
1da177e4 LT |
959 | while ((dst = *pprev) != NULL) { |
960 | if (!atomic_read(&dst->__refcnt)) { | |
961 | *pprev = dst->next; | |
962 | dst_free(dst); | |
963 | freed++; | |
964 | } else { | |
965 | pprev = &dst->next; | |
966 | (*more)++; | |
967 | } | |
968 | } | |
969 | ||
5d0bbeeb TG |
970 | spin_unlock_bh(&ndisc_lock); |
971 | ||
1da177e4 LT |
972 | return freed; |
973 | } | |
974 | ||
975 | static int ip6_dst_gc(void) | |
976 | { | |
977 | static unsigned expire = 30*HZ; | |
978 | static unsigned long last_gc; | |
979 | unsigned long now = jiffies; | |
980 | ||
981 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && | |
982 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) | |
983 | goto out; | |
984 | ||
985 | expire++; | |
986 | fib6_run_gc(expire); | |
987 | last_gc = now; | |
988 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
989 | expire = ip6_rt_gc_timeout>>1; | |
990 | ||
991 | out: | |
992 | expire -= expire>>ip6_rt_gc_elasticity; | |
993 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); | |
994 | } | |
995 | ||
996 | /* Clean host part of a prefix. Not necessary in radix tree, | |
997 | but results in cleaner routing tables. | |
998 | ||
999 | Remove it only when all the things will work! | |
1000 | */ | |
1001 | ||
1002 | static int ipv6_get_mtu(struct net_device *dev) | |
1003 | { | |
1004 | int mtu = IPV6_MIN_MTU; | |
1005 | struct inet6_dev *idev; | |
1006 | ||
1007 | idev = in6_dev_get(dev); | |
1008 | if (idev) { | |
1009 | mtu = idev->cnf.mtu6; | |
1010 | in6_dev_put(idev); | |
1011 | } | |
1012 | return mtu; | |
1013 | } | |
1014 | ||
1015 | int ipv6_get_hoplimit(struct net_device *dev) | |
1016 | { | |
1017 | int hoplimit = ipv6_devconf.hop_limit; | |
1018 | struct inet6_dev *idev; | |
1019 | ||
1020 | idev = in6_dev_get(dev); | |
1021 | if (idev) { | |
1022 | hoplimit = idev->cnf.hop_limit; | |
1023 | in6_dev_put(idev); | |
1024 | } | |
1025 | return hoplimit; | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * | |
1030 | */ | |
1031 | ||
86872cb5 | 1032 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1033 | { |
1034 | int err; | |
1da177e4 LT |
1035 | struct rt6_info *rt = NULL; |
1036 | struct net_device *dev = NULL; | |
1037 | struct inet6_dev *idev = NULL; | |
c71099ac | 1038 | struct fib6_table *table; |
1da177e4 LT |
1039 | int addr_type; |
1040 | ||
86872cb5 | 1041 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1042 | return -EINVAL; |
1043 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1044 | if (cfg->fc_src_len) |
1da177e4 LT |
1045 | return -EINVAL; |
1046 | #endif | |
86872cb5 | 1047 | if (cfg->fc_ifindex) { |
1da177e4 | 1048 | err = -ENODEV; |
86872cb5 | 1049 | dev = dev_get_by_index(cfg->fc_ifindex); |
1da177e4 LT |
1050 | if (!dev) |
1051 | goto out; | |
1052 | idev = in6_dev_get(dev); | |
1053 | if (!idev) | |
1054 | goto out; | |
1055 | } | |
1056 | ||
86872cb5 TG |
1057 | if (cfg->fc_metric == 0) |
1058 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1059 | |
86872cb5 | 1060 | table = fib6_new_table(cfg->fc_table); |
c71099ac TG |
1061 | if (table == NULL) { |
1062 | err = -ENOBUFS; | |
1063 | goto out; | |
1064 | } | |
1065 | ||
1da177e4 LT |
1066 | rt = ip6_dst_alloc(); |
1067 | ||
1068 | if (rt == NULL) { | |
1069 | err = -ENOMEM; | |
1070 | goto out; | |
1071 | } | |
1072 | ||
1073 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1074 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1075 | |
86872cb5 TG |
1076 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1077 | cfg->fc_protocol = RTPROT_BOOT; | |
1078 | rt->rt6i_protocol = cfg->fc_protocol; | |
1079 | ||
1080 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1081 | |
1082 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1083 | rt->u.dst.input = ip6_mc_input; | |
1084 | else | |
1085 | rt->u.dst.input = ip6_forward; | |
1086 | ||
1087 | rt->u.dst.output = ip6_output; | |
1088 | ||
86872cb5 TG |
1089 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1090 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1091 | if (rt->rt6i_dst.plen == 128) |
1092 | rt->u.dst.flags = DST_HOST; | |
1093 | ||
1094 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1095 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1096 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1097 | #endif |
1098 | ||
86872cb5 | 1099 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1100 | |
1101 | /* We cannot add true routes via loopback here, | |
1102 | they would result in kernel looping; promote them to reject routes | |
1103 | */ | |
86872cb5 | 1104 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1105 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1106 | /* hold loopback dev/idev if we haven't done so. */ | |
1107 | if (dev != &loopback_dev) { | |
1108 | if (dev) { | |
1109 | dev_put(dev); | |
1110 | in6_dev_put(idev); | |
1111 | } | |
1112 | dev = &loopback_dev; | |
1113 | dev_hold(dev); | |
1114 | idev = in6_dev_get(dev); | |
1115 | if (!idev) { | |
1116 | err = -ENODEV; | |
1117 | goto out; | |
1118 | } | |
1119 | } | |
1120 | rt->u.dst.output = ip6_pkt_discard_out; | |
1121 | rt->u.dst.input = ip6_pkt_discard; | |
1122 | rt->u.dst.error = -ENETUNREACH; | |
1123 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1124 | goto install_route; | |
1125 | } | |
1126 | ||
86872cb5 | 1127 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1128 | struct in6_addr *gw_addr; |
1129 | int gwa_type; | |
1130 | ||
86872cb5 TG |
1131 | gw_addr = &cfg->fc_gateway; |
1132 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1133 | gwa_type = ipv6_addr_type(gw_addr); |
1134 | ||
1135 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1136 | struct rt6_info *grt; | |
1137 | ||
1138 | /* IPv6 strictly inhibits using not link-local | |
1139 | addresses as nexthop address. | |
1140 | Otherwise, router will not able to send redirects. | |
1141 | It is very good, but in some (rare!) circumstances | |
1142 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1143 | some exceptions. --ANK | |
1144 | */ | |
1145 | err = -EINVAL; | |
1146 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1147 | goto out; | |
1148 | ||
86872cb5 | 1149 | grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1150 | |
1151 | err = -EHOSTUNREACH; | |
1152 | if (grt == NULL) | |
1153 | goto out; | |
1154 | if (dev) { | |
1155 | if (dev != grt->rt6i_dev) { | |
1156 | dst_release(&grt->u.dst); | |
1157 | goto out; | |
1158 | } | |
1159 | } else { | |
1160 | dev = grt->rt6i_dev; | |
1161 | idev = grt->rt6i_idev; | |
1162 | dev_hold(dev); | |
1163 | in6_dev_hold(grt->rt6i_idev); | |
1164 | } | |
1165 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1166 | err = 0; | |
1167 | dst_release(&grt->u.dst); | |
1168 | ||
1169 | if (err) | |
1170 | goto out; | |
1171 | } | |
1172 | err = -EINVAL; | |
1173 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1174 | goto out; | |
1175 | } | |
1176 | ||
1177 | err = -ENODEV; | |
1178 | if (dev == NULL) | |
1179 | goto out; | |
1180 | ||
86872cb5 | 1181 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1182 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1183 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1184 | err = PTR_ERR(rt->rt6i_nexthop); | |
1185 | rt->rt6i_nexthop = NULL; | |
1186 | goto out; | |
1187 | } | |
1188 | } | |
1189 | ||
86872cb5 | 1190 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1191 | |
1192 | install_route: | |
86872cb5 TG |
1193 | if (cfg->fc_mx) { |
1194 | struct nlattr *nla; | |
1195 | int remaining; | |
1196 | ||
1197 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1198 | int type = nla->nla_type; | |
1199 | ||
1200 | if (type) { | |
1201 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1202 | err = -EINVAL; |
1203 | goto out; | |
1204 | } | |
86872cb5 TG |
1205 | |
1206 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1207 | } |
1da177e4 LT |
1208 | } |
1209 | } | |
1210 | ||
1211 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1212 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1213 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1214 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1215 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1216 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1217 | rt->u.dst.dev = dev; | |
1218 | rt->rt6i_idev = idev; | |
c71099ac | 1219 | rt->rt6i_table = table; |
86872cb5 | 1220 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1221 | |
1222 | out: | |
1223 | if (dev) | |
1224 | dev_put(dev); | |
1225 | if (idev) | |
1226 | in6_dev_put(idev); | |
1227 | if (rt) | |
1228 | dst_free((struct dst_entry *) rt); | |
1229 | return err; | |
1230 | } | |
1231 | ||
86872cb5 | 1232 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1233 | { |
1234 | int err; | |
c71099ac | 1235 | struct fib6_table *table; |
1da177e4 | 1236 | |
6c813a72 PM |
1237 | if (rt == &ip6_null_entry) |
1238 | return -ENOENT; | |
1239 | ||
c71099ac TG |
1240 | table = rt->rt6i_table; |
1241 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1242 | |
86872cb5 | 1243 | err = fib6_del(rt, info); |
1da177e4 LT |
1244 | dst_release(&rt->u.dst); |
1245 | ||
c71099ac | 1246 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1247 | |
1248 | return err; | |
1249 | } | |
1250 | ||
e0a1ad73 TG |
1251 | int ip6_del_rt(struct rt6_info *rt) |
1252 | { | |
86872cb5 | 1253 | return __ip6_del_rt(rt, NULL); |
e0a1ad73 TG |
1254 | } |
1255 | ||
86872cb5 | 1256 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1257 | { |
c71099ac | 1258 | struct fib6_table *table; |
1da177e4 LT |
1259 | struct fib6_node *fn; |
1260 | struct rt6_info *rt; | |
1261 | int err = -ESRCH; | |
1262 | ||
86872cb5 | 1263 | table = fib6_get_table(cfg->fc_table); |
c71099ac TG |
1264 | if (table == NULL) |
1265 | return err; | |
1266 | ||
1267 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1268 | |
c71099ac | 1269 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1270 | &cfg->fc_dst, cfg->fc_dst_len, |
1271 | &cfg->fc_src, cfg->fc_src_len); | |
1da177e4 LT |
1272 | |
1273 | if (fn) { | |
1274 | for (rt = fn->leaf; rt; rt = rt->u.next) { | |
86872cb5 | 1275 | if (cfg->fc_ifindex && |
1da177e4 | 1276 | (rt->rt6i_dev == NULL || |
86872cb5 | 1277 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1278 | continue; |
86872cb5 TG |
1279 | if (cfg->fc_flags & RTF_GATEWAY && |
1280 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1281 | continue; |
86872cb5 | 1282 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1283 | continue; |
1284 | dst_hold(&rt->u.dst); | |
c71099ac | 1285 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1286 | |
86872cb5 | 1287 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1288 | } |
1289 | } | |
c71099ac | 1290 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1291 | |
1292 | return err; | |
1293 | } | |
1294 | ||
1295 | /* | |
1296 | * Handle redirects | |
1297 | */ | |
a6279458 YH |
1298 | struct ip6rd_flowi { |
1299 | struct flowi fl; | |
1300 | struct in6_addr gateway; | |
1301 | }; | |
1302 | ||
1303 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1304 | struct flowi *fl, | |
1305 | int flags) | |
1da177e4 | 1306 | { |
a6279458 YH |
1307 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1308 | struct rt6_info *rt; | |
e843b9e1 | 1309 | struct fib6_node *fn; |
c71099ac | 1310 | |
1da177e4 | 1311 | /* |
e843b9e1 YH |
1312 | * Get the "current" route for this destination and |
1313 | * check if the redirect has come from approriate router. | |
1314 | * | |
1315 | * RFC 2461 specifies that redirects should only be | |
1316 | * accepted if they come from the nexthop to the target. | |
1317 | * Due to the way the routes are chosen, this notion | |
1318 | * is a bit fuzzy and one might need to check all possible | |
1319 | * routes. | |
1da177e4 | 1320 | */ |
1da177e4 | 1321 | |
c71099ac | 1322 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1323 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 YH |
1324 | restart: |
1325 | for (rt = fn->leaf; rt; rt = rt->u.next) { | |
1326 | /* | |
1327 | * Current route is on-link; redirect is always invalid. | |
1328 | * | |
1329 | * Seems, previous statement is not true. It could | |
1330 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1331 | * But then router serving it might decide, that we should | |
1332 | * know truth 8)8) --ANK (980726). | |
1333 | */ | |
1334 | if (rt6_check_expired(rt)) | |
1335 | continue; | |
1336 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1337 | continue; | |
a6279458 | 1338 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1339 | continue; |
a6279458 | 1340 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1341 | continue; |
1342 | break; | |
1343 | } | |
a6279458 | 1344 | |
cb15d9c2 | 1345 | if (!rt) |
a6279458 | 1346 | rt = &ip6_null_entry; |
cb15d9c2 YH |
1347 | BACKTRACK(&fl->fl6_src); |
1348 | out: | |
a6279458 YH |
1349 | dst_hold(&rt->u.dst); |
1350 | ||
c71099ac | 1351 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1352 | |
a6279458 YH |
1353 | return rt; |
1354 | }; | |
1355 | ||
1356 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1357 | struct in6_addr *src, | |
1358 | struct in6_addr *gateway, | |
1359 | struct net_device *dev) | |
1360 | { | |
adaa70bb | 1361 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
a6279458 YH |
1362 | struct ip6rd_flowi rdfl = { |
1363 | .fl = { | |
1364 | .oif = dev->ifindex, | |
1365 | .nl_u = { | |
1366 | .ip6_u = { | |
1367 | .daddr = *dest, | |
1368 | .saddr = *src, | |
1369 | }, | |
1370 | }, | |
1371 | }, | |
1372 | .gateway = *gateway, | |
1373 | }; | |
adaa70bb TG |
1374 | |
1375 | if (rt6_need_strict(dest)) | |
1376 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 YH |
1377 | |
1378 | return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect); | |
1379 | } | |
1380 | ||
1381 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1382 | struct in6_addr *saddr, | |
1383 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1384 | { | |
1385 | struct rt6_info *rt, *nrt = NULL; | |
1386 | struct netevent_redirect netevent; | |
1387 | ||
1388 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1389 | ||
1390 | if (rt == &ip6_null_entry) { | |
1da177e4 LT |
1391 | if (net_ratelimit()) |
1392 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1393 | "for redirect target\n"); | |
a6279458 | 1394 | goto out; |
1da177e4 LT |
1395 | } |
1396 | ||
1da177e4 LT |
1397 | /* |
1398 | * We have finally decided to accept it. | |
1399 | */ | |
1400 | ||
1401 | neigh_update(neigh, lladdr, NUD_STALE, | |
1402 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1403 | NEIGH_UPDATE_F_OVERRIDE| | |
1404 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1405 | NEIGH_UPDATE_F_ISROUTER)) | |
1406 | ); | |
1407 | ||
1408 | /* | |
1409 | * Redirect received -> path was valid. | |
1410 | * Look, redirects are sent only in response to data packets, | |
1411 | * so that this nexthop apparently is reachable. --ANK | |
1412 | */ | |
1413 | dst_confirm(&rt->u.dst); | |
1414 | ||
1415 | /* Duplicate redirect: silently ignore. */ | |
1416 | if (neigh == rt->u.dst.neighbour) | |
1417 | goto out; | |
1418 | ||
1419 | nrt = ip6_rt_copy(rt); | |
1420 | if (nrt == NULL) | |
1421 | goto out; | |
1422 | ||
1423 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1424 | if (on_link) | |
1425 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1426 | ||
1427 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1428 | nrt->rt6i_dst.plen = 128; | |
1429 | nrt->u.dst.flags |= DST_HOST; | |
1430 | ||
1431 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1432 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1433 | /* Reset pmtu, it may be better */ | |
1434 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1435 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1436 | ||
40e22e8f | 1437 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1438 | goto out; |
1439 | ||
8d71740c TT |
1440 | netevent.old = &rt->u.dst; |
1441 | netevent.new = &nrt->u.dst; | |
1442 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1443 | ||
1da177e4 | 1444 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1445 | ip6_del_rt(rt); |
1da177e4 LT |
1446 | return; |
1447 | } | |
1448 | ||
1449 | out: | |
1450 | dst_release(&rt->u.dst); | |
1451 | return; | |
1452 | } | |
1453 | ||
1454 | /* | |
1455 | * Handle ICMP "packet too big" messages | |
1456 | * i.e. Path MTU discovery | |
1457 | */ | |
1458 | ||
1459 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1460 | struct net_device *dev, u32 pmtu) | |
1461 | { | |
1462 | struct rt6_info *rt, *nrt; | |
1463 | int allfrag = 0; | |
1464 | ||
1465 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1466 | if (rt == NULL) | |
1467 | return; | |
1468 | ||
1469 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1470 | goto out; | |
1471 | ||
1472 | if (pmtu < IPV6_MIN_MTU) { | |
1473 | /* | |
1474 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link | |
1475 | * MTU (1280) and a fragment header should always be included | |
1476 | * after a node receiving Too Big message reporting PMTU is | |
1477 | * less than the IPv6 Minimum Link MTU. | |
1478 | */ | |
1479 | pmtu = IPV6_MIN_MTU; | |
1480 | allfrag = 1; | |
1481 | } | |
1482 | ||
1483 | /* New mtu received -> path was valid. | |
1484 | They are sent only in response to data packets, | |
1485 | so that this nexthop apparently is reachable. --ANK | |
1486 | */ | |
1487 | dst_confirm(&rt->u.dst); | |
1488 | ||
1489 | /* Host route. If it is static, it would be better | |
1490 | not to override it, but add new one, so that | |
1491 | when cache entry will expire old pmtu | |
1492 | would return automatically. | |
1493 | */ | |
1494 | if (rt->rt6i_flags & RTF_CACHE) { | |
1495 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1496 | if (allfrag) | |
1497 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1498 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); | |
1499 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; | |
1500 | goto out; | |
1501 | } | |
1502 | ||
1503 | /* Network route. | |
1504 | Two cases are possible: | |
1505 | 1. It is connected route. Action: COW | |
1506 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1507 | */ | |
d5315b50 | 1508 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1509 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1510 | else |
1511 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1512 | |
d5315b50 | 1513 | if (nrt) { |
a1e78363 YH |
1514 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1515 | if (allfrag) | |
1516 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1517 | ||
1518 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1519 | * happened within 5 mins, the recommended timer is 10 mins. | |
1520 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1521 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1522 | * and detecting PMTU increase will be automatically happened. | |
1523 | */ | |
1524 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); | |
1525 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; | |
1526 | ||
40e22e8f | 1527 | ip6_ins_rt(nrt); |
1da177e4 | 1528 | } |
1da177e4 LT |
1529 | out: |
1530 | dst_release(&rt->u.dst); | |
1531 | } | |
1532 | ||
1533 | /* | |
1534 | * Misc support functions | |
1535 | */ | |
1536 | ||
1537 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1538 | { | |
1539 | struct rt6_info *rt = ip6_dst_alloc(); | |
1540 | ||
1541 | if (rt) { | |
1542 | rt->u.dst.input = ort->u.dst.input; | |
1543 | rt->u.dst.output = ort->u.dst.output; | |
1544 | ||
1545 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1546 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1547 | rt->u.dst.dev = ort->u.dst.dev; |
1548 | if (rt->u.dst.dev) | |
1549 | dev_hold(rt->u.dst.dev); | |
1550 | rt->rt6i_idev = ort->rt6i_idev; | |
1551 | if (rt->rt6i_idev) | |
1552 | in6_dev_hold(rt->rt6i_idev); | |
1553 | rt->u.dst.lastuse = jiffies; | |
1554 | rt->rt6i_expires = 0; | |
1555 | ||
1556 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1557 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1558 | rt->rt6i_metric = 0; | |
1559 | ||
1560 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1561 | #ifdef CONFIG_IPV6_SUBTREES | |
1562 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1563 | #endif | |
c71099ac | 1564 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1565 | } |
1566 | return rt; | |
1567 | } | |
1568 | ||
70ceb4f5 YH |
1569 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1570 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1571 | struct in6_addr *gwaddr, int ifindex) | |
1572 | { | |
1573 | struct fib6_node *fn; | |
1574 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1575 | struct fib6_table *table; |
1576 | ||
1577 | table = fib6_get_table(RT6_TABLE_INFO); | |
1578 | if (table == NULL) | |
1579 | return NULL; | |
70ceb4f5 | 1580 | |
c71099ac TG |
1581 | write_lock_bh(&table->tb6_lock); |
1582 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1583 | if (!fn) |
1584 | goto out; | |
1585 | ||
1586 | for (rt = fn->leaf; rt; rt = rt->u.next) { | |
1587 | if (rt->rt6i_dev->ifindex != ifindex) | |
1588 | continue; | |
1589 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1590 | continue; | |
1591 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1592 | continue; | |
1593 | dst_hold(&rt->u.dst); | |
1594 | break; | |
1595 | } | |
1596 | out: | |
c71099ac | 1597 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1598 | return rt; |
1599 | } | |
1600 | ||
1601 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1602 | struct in6_addr *gwaddr, int ifindex, | |
1603 | unsigned pref) | |
1604 | { | |
86872cb5 TG |
1605 | struct fib6_config cfg = { |
1606 | .fc_table = RT6_TABLE_INFO, | |
1607 | .fc_metric = 1024, | |
1608 | .fc_ifindex = ifindex, | |
1609 | .fc_dst_len = prefixlen, | |
1610 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1611 | RTF_UP | RTF_PREF(pref), | |
1612 | }; | |
1613 | ||
1614 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1615 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1616 | |
e317da96 YH |
1617 | /* We should treat it as a default route if prefix length is 0. */ |
1618 | if (!prefixlen) | |
86872cb5 | 1619 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1620 | |
86872cb5 | 1621 | ip6_route_add(&cfg); |
70ceb4f5 YH |
1622 | |
1623 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1624 | } | |
1625 | #endif | |
1626 | ||
1da177e4 LT |
1627 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1628 | { | |
1629 | struct rt6_info *rt; | |
c71099ac | 1630 | struct fib6_table *table; |
1da177e4 | 1631 | |
c71099ac TG |
1632 | table = fib6_get_table(RT6_TABLE_DFLT); |
1633 | if (table == NULL) | |
1634 | return NULL; | |
1da177e4 | 1635 | |
c71099ac TG |
1636 | write_lock_bh(&table->tb6_lock); |
1637 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.next) { | |
1da177e4 | 1638 | if (dev == rt->rt6i_dev && |
045927ff | 1639 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1640 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1641 | break; | |
1642 | } | |
1643 | if (rt) | |
1644 | dst_hold(&rt->u.dst); | |
c71099ac | 1645 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1646 | return rt; |
1647 | } | |
1648 | ||
1649 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1650 | struct net_device *dev, |
1651 | unsigned int pref) | |
1da177e4 | 1652 | { |
86872cb5 TG |
1653 | struct fib6_config cfg = { |
1654 | .fc_table = RT6_TABLE_DFLT, | |
1655 | .fc_metric = 1024, | |
1656 | .fc_ifindex = dev->ifindex, | |
1657 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1658 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
1659 | }; | |
1da177e4 | 1660 | |
86872cb5 | 1661 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1662 | |
86872cb5 | 1663 | ip6_route_add(&cfg); |
1da177e4 | 1664 | |
1da177e4 LT |
1665 | return rt6_get_dflt_router(gwaddr, dev); |
1666 | } | |
1667 | ||
1668 | void rt6_purge_dflt_routers(void) | |
1669 | { | |
1670 | struct rt6_info *rt; | |
c71099ac TG |
1671 | struct fib6_table *table; |
1672 | ||
1673 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
1674 | table = fib6_get_table(RT6_TABLE_DFLT); | |
1675 | if (table == NULL) | |
1676 | return; | |
1da177e4 LT |
1677 | |
1678 | restart: | |
c71099ac TG |
1679 | read_lock_bh(&table->tb6_lock); |
1680 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.next) { | |
1da177e4 LT |
1681 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1682 | dst_hold(&rt->u.dst); | |
c71099ac | 1683 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1684 | ip6_del_rt(rt); |
1da177e4 LT |
1685 | goto restart; |
1686 | } | |
1687 | } | |
c71099ac | 1688 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1689 | } |
1690 | ||
86872cb5 TG |
1691 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, |
1692 | struct fib6_config *cfg) | |
1693 | { | |
1694 | memset(cfg, 0, sizeof(*cfg)); | |
1695 | ||
1696 | cfg->fc_table = RT6_TABLE_MAIN; | |
1697 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1698 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1699 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1700 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1701 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1702 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1703 | ||
1704 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); | |
1705 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1706 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1707 | } | |
1708 | ||
1da177e4 LT |
1709 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
1710 | { | |
86872cb5 | 1711 | struct fib6_config cfg; |
1da177e4 LT |
1712 | struct in6_rtmsg rtmsg; |
1713 | int err; | |
1714 | ||
1715 | switch(cmd) { | |
1716 | case SIOCADDRT: /* Add a route */ | |
1717 | case SIOCDELRT: /* Delete a route */ | |
1718 | if (!capable(CAP_NET_ADMIN)) | |
1719 | return -EPERM; | |
1720 | err = copy_from_user(&rtmsg, arg, | |
1721 | sizeof(struct in6_rtmsg)); | |
1722 | if (err) | |
1723 | return -EFAULT; | |
86872cb5 TG |
1724 | |
1725 | rtmsg_to_fib6_config(&rtmsg, &cfg); | |
1726 | ||
1da177e4 LT |
1727 | rtnl_lock(); |
1728 | switch (cmd) { | |
1729 | case SIOCADDRT: | |
86872cb5 | 1730 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1731 | break; |
1732 | case SIOCDELRT: | |
86872cb5 | 1733 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1734 | break; |
1735 | default: | |
1736 | err = -EINVAL; | |
1737 | } | |
1738 | rtnl_unlock(); | |
1739 | ||
1740 | return err; | |
1741 | }; | |
1742 | ||
1743 | return -EINVAL; | |
1744 | } | |
1745 | ||
1746 | /* | |
1747 | * Drop the packet on the floor | |
1748 | */ | |
1749 | ||
9ce8ade0 | 1750 | static inline int ip6_pkt_drop(struct sk_buff *skb, int code) |
1da177e4 | 1751 | { |
76d0cc1b LL |
1752 | int type = ipv6_addr_type(&skb->nh.ipv6h->daddr); |
1753 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) | |
1754 | IP6_INC_STATS(IPSTATS_MIB_INADDRERRORS); | |
1755 | ||
1da177e4 | 1756 | IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 | 1757 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1758 | kfree_skb(skb); |
1759 | return 0; | |
1760 | } | |
1761 | ||
9ce8ade0 TG |
1762 | static int ip6_pkt_discard(struct sk_buff *skb) |
1763 | { | |
1764 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE); | |
1765 | } | |
1766 | ||
20380731 | 1767 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1768 | { |
1769 | skb->dev = skb->dst->dev; | |
1770 | return ip6_pkt_discard(skb); | |
1771 | } | |
1772 | ||
6723ab54 DM |
1773 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1774 | ||
9ce8ade0 TG |
1775 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1776 | { | |
1777 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED); | |
1778 | } | |
1779 | ||
1780 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1781 | { | |
1782 | skb->dev = skb->dst->dev; | |
1783 | return ip6_pkt_prohibit(skb); | |
1784 | } | |
1785 | ||
1786 | static int ip6_pkt_blk_hole(struct sk_buff *skb) | |
1787 | { | |
1788 | kfree_skb(skb); | |
1789 | return 0; | |
1790 | } | |
1791 | ||
6723ab54 DM |
1792 | #endif |
1793 | ||
1da177e4 LT |
1794 | /* |
1795 | * Allocate a dst for local (unicast / anycast) address. | |
1796 | */ | |
1797 | ||
1798 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1799 | const struct in6_addr *addr, | |
1800 | int anycast) | |
1801 | { | |
1802 | struct rt6_info *rt = ip6_dst_alloc(); | |
1803 | ||
1804 | if (rt == NULL) | |
1805 | return ERR_PTR(-ENOMEM); | |
1806 | ||
1807 | dev_hold(&loopback_dev); | |
1808 | in6_dev_hold(idev); | |
1809 | ||
1810 | rt->u.dst.flags = DST_HOST; | |
1811 | rt->u.dst.input = ip6_input; | |
1812 | rt->u.dst.output = ip6_output; | |
1813 | rt->rt6i_dev = &loopback_dev; | |
1814 | rt->rt6i_idev = idev; | |
1815 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1816 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1817 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1818 | rt->u.dst.obsolete = -1; | |
1819 | ||
1820 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1821 | if (anycast) |
1822 | rt->rt6i_flags |= RTF_ANYCAST; | |
1823 | else | |
1da177e4 LT |
1824 | rt->rt6i_flags |= RTF_LOCAL; |
1825 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1826 | if (rt->rt6i_nexthop == NULL) { | |
1827 | dst_free((struct dst_entry *) rt); | |
1828 | return ERR_PTR(-ENOMEM); | |
1829 | } | |
1830 | ||
1831 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1832 | rt->rt6i_dst.plen = 128; | |
c71099ac | 1833 | rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL); |
1da177e4 LT |
1834 | |
1835 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1836 | ||
1837 | return rt; | |
1838 | } | |
1839 | ||
1840 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1841 | { | |
1842 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1843 | rt != &ip6_null_entry) { | |
1844 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1845 | return -1; | |
1846 | } | |
1847 | return 0; | |
1848 | } | |
1849 | ||
1850 | void rt6_ifdown(struct net_device *dev) | |
1851 | { | |
c71099ac | 1852 | fib6_clean_all(fib6_ifdown, 0, dev); |
1da177e4 LT |
1853 | } |
1854 | ||
1855 | struct rt6_mtu_change_arg | |
1856 | { | |
1857 | struct net_device *dev; | |
1858 | unsigned mtu; | |
1859 | }; | |
1860 | ||
1861 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1862 | { | |
1863 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1864 | struct inet6_dev *idev; | |
1865 | ||
1866 | /* In IPv6 pmtu discovery is not optional, | |
1867 | so that RTAX_MTU lock cannot disable it. | |
1868 | We still use this lock to block changes | |
1869 | caused by addrconf/ndisc. | |
1870 | */ | |
1871 | ||
1872 | idev = __in6_dev_get(arg->dev); | |
1873 | if (idev == NULL) | |
1874 | return 0; | |
1875 | ||
1876 | /* For administrative MTU increase, there is no way to discover | |
1877 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1878 | Since RFC 1981 doesn't include administrative MTU increase | |
1879 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1880 | */ | |
1881 | /* | |
1882 | If new MTU is less than route PMTU, this new MTU will be the | |
1883 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1884 | decreases; if new MTU is greater than route PMTU, and the | |
1885 | old MTU is the lowest MTU in the path, update the route PMTU | |
1886 | to reflect the increase. In this case if the other nodes' MTU | |
1887 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1888 | PMTU discouvery. | |
1889 | */ | |
1890 | if (rt->rt6i_dev == arg->dev && | |
1891 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
1892 | (dst_mtu(&rt->u.dst) > arg->mtu || | |
1893 | (dst_mtu(&rt->u.dst) < arg->mtu && | |
1894 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) | |
1895 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; | |
1896 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); | |
1897 | return 0; | |
1898 | } | |
1899 | ||
1900 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1901 | { | |
c71099ac TG |
1902 | struct rt6_mtu_change_arg arg = { |
1903 | .dev = dev, | |
1904 | .mtu = mtu, | |
1905 | }; | |
1da177e4 | 1906 | |
c71099ac | 1907 | fib6_clean_all(rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1908 | } |
1909 | ||
86872cb5 | 1910 | static struct nla_policy rtm_ipv6_policy[RTA_MAX+1] __read_mostly = { |
5176f91e | 1911 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1912 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1913 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1914 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1915 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1916 | }; | |
1917 | ||
1918 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1919 | struct fib6_config *cfg) | |
1da177e4 | 1920 | { |
86872cb5 TG |
1921 | struct rtmsg *rtm; |
1922 | struct nlattr *tb[RTA_MAX+1]; | |
1923 | int err; | |
1da177e4 | 1924 | |
86872cb5 TG |
1925 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1926 | if (err < 0) | |
1927 | goto errout; | |
1da177e4 | 1928 | |
86872cb5 TG |
1929 | err = -EINVAL; |
1930 | rtm = nlmsg_data(nlh); | |
1931 | memset(cfg, 0, sizeof(*cfg)); | |
1932 | ||
1933 | cfg->fc_table = rtm->rtm_table; | |
1934 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
1935 | cfg->fc_src_len = rtm->rtm_src_len; | |
1936 | cfg->fc_flags = RTF_UP; | |
1937 | cfg->fc_protocol = rtm->rtm_protocol; | |
1938 | ||
1939 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
1940 | cfg->fc_flags |= RTF_REJECT; | |
1941 | ||
1942 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
1943 | cfg->fc_nlinfo.nlh = nlh; | |
1944 | ||
1945 | if (tb[RTA_GATEWAY]) { | |
1946 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
1947 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 1948 | } |
86872cb5 TG |
1949 | |
1950 | if (tb[RTA_DST]) { | |
1951 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
1952 | ||
1953 | if (nla_len(tb[RTA_DST]) < plen) | |
1954 | goto errout; | |
1955 | ||
1956 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 1957 | } |
86872cb5 TG |
1958 | |
1959 | if (tb[RTA_SRC]) { | |
1960 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
1961 | ||
1962 | if (nla_len(tb[RTA_SRC]) < plen) | |
1963 | goto errout; | |
1964 | ||
1965 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 1966 | } |
86872cb5 TG |
1967 | |
1968 | if (tb[RTA_OIF]) | |
1969 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
1970 | ||
1971 | if (tb[RTA_PRIORITY]) | |
1972 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
1973 | ||
1974 | if (tb[RTA_METRICS]) { | |
1975 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
1976 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 1977 | } |
86872cb5 TG |
1978 | |
1979 | if (tb[RTA_TABLE]) | |
1980 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
1981 | ||
1982 | err = 0; | |
1983 | errout: | |
1984 | return err; | |
1da177e4 LT |
1985 | } |
1986 | ||
1987 | int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
1988 | { | |
86872cb5 TG |
1989 | struct fib6_config cfg; |
1990 | int err; | |
1da177e4 | 1991 | |
86872cb5 TG |
1992 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
1993 | if (err < 0) | |
1994 | return err; | |
1995 | ||
1996 | return ip6_route_del(&cfg); | |
1da177e4 LT |
1997 | } |
1998 | ||
1999 | int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
2000 | { | |
86872cb5 TG |
2001 | struct fib6_config cfg; |
2002 | int err; | |
1da177e4 | 2003 | |
86872cb5 TG |
2004 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2005 | if (err < 0) | |
2006 | return err; | |
2007 | ||
2008 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2009 | } |
2010 | ||
1da177e4 | 2011 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2012 | struct in6_addr *dst, struct in6_addr *src, |
2013 | int iif, int type, u32 pid, u32 seq, | |
2014 | int prefix, unsigned int flags) | |
1da177e4 LT |
2015 | { |
2016 | struct rtmsg *rtm; | |
2d7202bf | 2017 | struct nlmsghdr *nlh; |
1da177e4 | 2018 | struct rta_cacheinfo ci; |
9e762a4a | 2019 | u32 table; |
1da177e4 LT |
2020 | |
2021 | if (prefix) { /* user wants prefix routes only */ | |
2022 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2023 | /* success since this is not a prefix route */ | |
2024 | return 1; | |
2025 | } | |
2026 | } | |
2027 | ||
2d7202bf TG |
2028 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2029 | if (nlh == NULL) | |
2030 | return -ENOBUFS; | |
2031 | ||
2032 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2033 | rtm->rtm_family = AF_INET6; |
2034 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2035 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2036 | rtm->rtm_tos = 0; | |
c71099ac | 2037 | if (rt->rt6i_table) |
9e762a4a | 2038 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2039 | else |
9e762a4a PM |
2040 | table = RT6_TABLE_UNSPEC; |
2041 | rtm->rtm_table = table; | |
2d7202bf | 2042 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2043 | if (rt->rt6i_flags&RTF_REJECT) |
2044 | rtm->rtm_type = RTN_UNREACHABLE; | |
2045 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2046 | rtm->rtm_type = RTN_LOCAL; | |
2047 | else | |
2048 | rtm->rtm_type = RTN_UNICAST; | |
2049 | rtm->rtm_flags = 0; | |
2050 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2051 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2052 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2053 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2054 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2055 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2056 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2057 | rtm->rtm_protocol = RTPROT_RA; | |
2058 | ||
2059 | if (rt->rt6i_flags&RTF_CACHE) | |
2060 | rtm->rtm_flags |= RTM_F_CLONED; | |
2061 | ||
2062 | if (dst) { | |
2d7202bf | 2063 | NLA_PUT(skb, RTA_DST, 16, dst); |
1da177e4 LT |
2064 | rtm->rtm_dst_len = 128; |
2065 | } else if (rtm->rtm_dst_len) | |
2d7202bf | 2066 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2067 | #ifdef CONFIG_IPV6_SUBTREES |
2068 | if (src) { | |
2d7202bf | 2069 | NLA_PUT(skb, RTA_SRC, 16, src); |
1da177e4 LT |
2070 | rtm->rtm_src_len = 128; |
2071 | } else if (rtm->rtm_src_len) | |
2d7202bf | 2072 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2073 | #endif |
2074 | if (iif) | |
2d7202bf | 2075 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2076 | else if (dst) { |
2077 | struct in6_addr saddr_buf; | |
2078 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) | |
2d7202bf | 2079 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2080 | } |
2d7202bf | 2081 | |
1da177e4 | 2082 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2083 | goto nla_put_failure; |
2084 | ||
1da177e4 | 2085 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2086 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2087 | ||
1da177e4 | 2088 | if (rt->u.dst.dev) |
2d7202bf TG |
2089 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2090 | ||
2091 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
1da177e4 LT |
2092 | ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse); |
2093 | if (rt->rt6i_expires) | |
2094 | ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies); | |
2095 | else | |
2096 | ci.rta_expires = 0; | |
2097 | ci.rta_used = rt->u.dst.__use; | |
2098 | ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt); | |
2099 | ci.rta_error = rt->u.dst.error; | |
2100 | ci.rta_id = 0; | |
2101 | ci.rta_ts = 0; | |
2102 | ci.rta_tsage = 0; | |
2d7202bf TG |
2103 | NLA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci); |
2104 | ||
2105 | return nlmsg_end(skb, nlh); | |
2106 | ||
2107 | nla_put_failure: | |
2108 | return nlmsg_cancel(skb, nlh); | |
1da177e4 LT |
2109 | } |
2110 | ||
1b43af54 | 2111 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2112 | { |
2113 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2114 | int prefix; | |
2115 | ||
2d7202bf TG |
2116 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2117 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2118 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2119 | } else | |
2120 | prefix = 0; | |
2121 | ||
2122 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2123 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2124 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2125 | } |
2126 | ||
1da177e4 LT |
2127 | int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
2128 | { | |
ab364a6f TG |
2129 | struct nlattr *tb[RTA_MAX+1]; |
2130 | struct rt6_info *rt; | |
1da177e4 | 2131 | struct sk_buff *skb; |
ab364a6f | 2132 | struct rtmsg *rtm; |
1da177e4 | 2133 | struct flowi fl; |
ab364a6f | 2134 | int err, iif = 0; |
1da177e4 | 2135 | |
ab364a6f TG |
2136 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2137 | if (err < 0) | |
2138 | goto errout; | |
1da177e4 | 2139 | |
ab364a6f | 2140 | err = -EINVAL; |
1da177e4 | 2141 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2142 | |
ab364a6f TG |
2143 | if (tb[RTA_SRC]) { |
2144 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2145 | goto errout; | |
2146 | ||
2147 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2148 | } | |
2149 | ||
2150 | if (tb[RTA_DST]) { | |
2151 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2152 | goto errout; | |
2153 | ||
2154 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2155 | } | |
2156 | ||
2157 | if (tb[RTA_IIF]) | |
2158 | iif = nla_get_u32(tb[RTA_IIF]); | |
2159 | ||
2160 | if (tb[RTA_OIF]) | |
2161 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2162 | |
2163 | if (iif) { | |
2164 | struct net_device *dev; | |
2165 | dev = __dev_get_by_index(iif); | |
2166 | if (!dev) { | |
2167 | err = -ENODEV; | |
ab364a6f | 2168 | goto errout; |
1da177e4 LT |
2169 | } |
2170 | } | |
2171 | ||
ab364a6f TG |
2172 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2173 | if (skb == NULL) { | |
2174 | err = -ENOBUFS; | |
2175 | goto errout; | |
2176 | } | |
1da177e4 | 2177 | |
ab364a6f TG |
2178 | /* Reserve room for dummy headers, this skb can pass |
2179 | through good chunk of routing engine. | |
2180 | */ | |
2181 | skb->mac.raw = skb->data; | |
2182 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); | |
1da177e4 | 2183 | |
ab364a6f | 2184 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2185 | skb->dst = &rt->u.dst; |
2186 | ||
ab364a6f | 2187 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2188 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2189 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2190 | if (err < 0) { |
ab364a6f TG |
2191 | kfree_skb(skb); |
2192 | goto errout; | |
1da177e4 LT |
2193 | } |
2194 | ||
2942e900 | 2195 | err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
ab364a6f | 2196 | errout: |
1da177e4 | 2197 | return err; |
1da177e4 LT |
2198 | } |
2199 | ||
86872cb5 | 2200 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2201 | { |
2202 | struct sk_buff *skb; | |
86872cb5 TG |
2203 | u32 pid = 0, seq = 0; |
2204 | struct nlmsghdr *nlh = NULL; | |
21713ebc TG |
2205 | int payload = sizeof(struct rtmsg) + 256; |
2206 | int err = -ENOBUFS; | |
2207 | ||
86872cb5 TG |
2208 | if (info) { |
2209 | pid = info->pid; | |
2210 | nlh = info->nlh; | |
2211 | if (nlh) | |
2212 | seq = nlh->nlmsg_seq; | |
2213 | } | |
2214 | ||
21713ebc TG |
2215 | skb = nlmsg_new(nlmsg_total_size(payload), gfp_any()); |
2216 | if (skb == NULL) | |
2217 | goto errout; | |
2218 | ||
2219 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0); | |
2220 | if (err < 0) { | |
1da177e4 | 2221 | kfree_skb(skb); |
21713ebc | 2222 | goto errout; |
1da177e4 | 2223 | } |
21713ebc TG |
2224 | |
2225 | err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any()); | |
2226 | errout: | |
2227 | if (err < 0) | |
2228 | rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err); | |
1da177e4 LT |
2229 | } |
2230 | ||
2231 | /* | |
2232 | * /proc | |
2233 | */ | |
2234 | ||
2235 | #ifdef CONFIG_PROC_FS | |
2236 | ||
2237 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2238 | ||
2239 | struct rt6_proc_arg | |
2240 | { | |
2241 | char *buffer; | |
2242 | int offset; | |
2243 | int length; | |
2244 | int skip; | |
2245 | int len; | |
2246 | }; | |
2247 | ||
2248 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2249 | { | |
2250 | struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg; | |
2251 | int i; | |
2252 | ||
2253 | if (arg->skip < arg->offset / RT6_INFO_LEN) { | |
2254 | arg->skip++; | |
2255 | return 0; | |
2256 | } | |
2257 | ||
2258 | if (arg->len >= arg->length) | |
2259 | return 0; | |
2260 | ||
2261 | for (i=0; i<16; i++) { | |
2262 | sprintf(arg->buffer + arg->len, "%02x", | |
2263 | rt->rt6i_dst.addr.s6_addr[i]); | |
2264 | arg->len += 2; | |
2265 | } | |
2266 | arg->len += sprintf(arg->buffer + arg->len, " %02x ", | |
2267 | rt->rt6i_dst.plen); | |
2268 | ||
2269 | #ifdef CONFIG_IPV6_SUBTREES | |
2270 | for (i=0; i<16; i++) { | |
2271 | sprintf(arg->buffer + arg->len, "%02x", | |
2272 | rt->rt6i_src.addr.s6_addr[i]); | |
2273 | arg->len += 2; | |
2274 | } | |
2275 | arg->len += sprintf(arg->buffer + arg->len, " %02x ", | |
2276 | rt->rt6i_src.plen); | |
2277 | #else | |
2278 | sprintf(arg->buffer + arg->len, | |
2279 | "00000000000000000000000000000000 00 "); | |
2280 | arg->len += 36; | |
2281 | #endif | |
2282 | ||
2283 | if (rt->rt6i_nexthop) { | |
2284 | for (i=0; i<16; i++) { | |
2285 | sprintf(arg->buffer + arg->len, "%02x", | |
2286 | rt->rt6i_nexthop->primary_key[i]); | |
2287 | arg->len += 2; | |
2288 | } | |
2289 | } else { | |
2290 | sprintf(arg->buffer + arg->len, | |
2291 | "00000000000000000000000000000000"); | |
2292 | arg->len += 32; | |
2293 | } | |
2294 | arg->len += sprintf(arg->buffer + arg->len, | |
2295 | " %08x %08x %08x %08x %8s\n", | |
2296 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2297 | rt->u.dst.__use, rt->rt6i_flags, | |
2298 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
2299 | return 0; | |
2300 | } | |
2301 | ||
2302 | static int rt6_proc_info(char *buffer, char **start, off_t offset, int length) | |
2303 | { | |
c71099ac TG |
2304 | struct rt6_proc_arg arg = { |
2305 | .buffer = buffer, | |
2306 | .offset = offset, | |
2307 | .length = length, | |
2308 | }; | |
1da177e4 | 2309 | |
c71099ac | 2310 | fib6_clean_all(rt6_info_route, 0, &arg); |
1da177e4 LT |
2311 | |
2312 | *start = buffer; | |
2313 | if (offset) | |
2314 | *start += offset % RT6_INFO_LEN; | |
2315 | ||
2316 | arg.len -= offset % RT6_INFO_LEN; | |
2317 | ||
2318 | if (arg.len > length) | |
2319 | arg.len = length; | |
2320 | if (arg.len < 0) | |
2321 | arg.len = 0; | |
2322 | ||
2323 | return arg.len; | |
2324 | } | |
2325 | ||
1da177e4 LT |
2326 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2327 | { | |
2328 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
2329 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
2330 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
2331 | rt6_stats.fib_rt_cache, | |
2332 | atomic_read(&ip6_dst_ops.entries), | |
2333 | rt6_stats.fib_discarded_routes); | |
2334 | ||
2335 | return 0; | |
2336 | } | |
2337 | ||
2338 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2339 | { | |
2340 | return single_open(file, rt6_stats_seq_show, NULL); | |
2341 | } | |
2342 | ||
2343 | static struct file_operations rt6_stats_seq_fops = { | |
2344 | .owner = THIS_MODULE, | |
2345 | .open = rt6_stats_seq_open, | |
2346 | .read = seq_read, | |
2347 | .llseek = seq_lseek, | |
2348 | .release = single_release, | |
2349 | }; | |
2350 | #endif /* CONFIG_PROC_FS */ | |
2351 | ||
2352 | #ifdef CONFIG_SYSCTL | |
2353 | ||
2354 | static int flush_delay; | |
2355 | ||
2356 | static | |
2357 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2358 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2359 | { | |
2360 | if (write) { | |
2361 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2362 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); | |
2363 | return 0; | |
2364 | } else | |
2365 | return -EINVAL; | |
2366 | } | |
2367 | ||
2368 | ctl_table ipv6_route_table[] = { | |
2369 | { | |
2370 | .ctl_name = NET_IPV6_ROUTE_FLUSH, | |
2371 | .procname = "flush", | |
2372 | .data = &flush_delay, | |
2373 | .maxlen = sizeof(int), | |
89c8b3a1 | 2374 | .mode = 0200, |
1da177e4 LT |
2375 | .proc_handler = &ipv6_sysctl_rtcache_flush |
2376 | }, | |
2377 | { | |
2378 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2379 | .procname = "gc_thresh", | |
2380 | .data = &ip6_dst_ops.gc_thresh, | |
2381 | .maxlen = sizeof(int), | |
2382 | .mode = 0644, | |
2383 | .proc_handler = &proc_dointvec, | |
2384 | }, | |
2385 | { | |
2386 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2387 | .procname = "max_size", | |
2388 | .data = &ip6_rt_max_size, | |
2389 | .maxlen = sizeof(int), | |
2390 | .mode = 0644, | |
2391 | .proc_handler = &proc_dointvec, | |
2392 | }, | |
2393 | { | |
2394 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2395 | .procname = "gc_min_interval", | |
2396 | .data = &ip6_rt_gc_min_interval, | |
2397 | .maxlen = sizeof(int), | |
2398 | .mode = 0644, | |
2399 | .proc_handler = &proc_dointvec_jiffies, | |
2400 | .strategy = &sysctl_jiffies, | |
2401 | }, | |
2402 | { | |
2403 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2404 | .procname = "gc_timeout", | |
2405 | .data = &ip6_rt_gc_timeout, | |
2406 | .maxlen = sizeof(int), | |
2407 | .mode = 0644, | |
2408 | .proc_handler = &proc_dointvec_jiffies, | |
2409 | .strategy = &sysctl_jiffies, | |
2410 | }, | |
2411 | { | |
2412 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2413 | .procname = "gc_interval", | |
2414 | .data = &ip6_rt_gc_interval, | |
2415 | .maxlen = sizeof(int), | |
2416 | .mode = 0644, | |
2417 | .proc_handler = &proc_dointvec_jiffies, | |
2418 | .strategy = &sysctl_jiffies, | |
2419 | }, | |
2420 | { | |
2421 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2422 | .procname = "gc_elasticity", | |
2423 | .data = &ip6_rt_gc_elasticity, | |
2424 | .maxlen = sizeof(int), | |
2425 | .mode = 0644, | |
2426 | .proc_handler = &proc_dointvec_jiffies, | |
2427 | .strategy = &sysctl_jiffies, | |
2428 | }, | |
2429 | { | |
2430 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2431 | .procname = "mtu_expires", | |
2432 | .data = &ip6_rt_mtu_expires, | |
2433 | .maxlen = sizeof(int), | |
2434 | .mode = 0644, | |
2435 | .proc_handler = &proc_dointvec_jiffies, | |
2436 | .strategy = &sysctl_jiffies, | |
2437 | }, | |
2438 | { | |
2439 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2440 | .procname = "min_adv_mss", | |
2441 | .data = &ip6_rt_min_advmss, | |
2442 | .maxlen = sizeof(int), | |
2443 | .mode = 0644, | |
2444 | .proc_handler = &proc_dointvec_jiffies, | |
2445 | .strategy = &sysctl_jiffies, | |
2446 | }, | |
2447 | { | |
2448 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2449 | .procname = "gc_min_interval_ms", | |
2450 | .data = &ip6_rt_gc_min_interval, | |
2451 | .maxlen = sizeof(int), | |
2452 | .mode = 0644, | |
2453 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2454 | .strategy = &sysctl_ms_jiffies, | |
2455 | }, | |
2456 | { .ctl_name = 0 } | |
2457 | }; | |
2458 | ||
2459 | #endif | |
2460 | ||
2461 | void __init ip6_route_init(void) | |
2462 | { | |
2463 | struct proc_dir_entry *p; | |
2464 | ||
e5d679f3 AD |
2465 | ip6_dst_ops.kmem_cachep = |
2466 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
2467 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL); | |
1da177e4 LT |
2468 | fib6_init(); |
2469 | #ifdef CONFIG_PROC_FS | |
2470 | p = proc_net_create("ipv6_route", 0, rt6_proc_info); | |
2471 | if (p) | |
2472 | p->owner = THIS_MODULE; | |
2473 | ||
2474 | proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2475 | #endif | |
2476 | #ifdef CONFIG_XFRM | |
2477 | xfrm6_init(); | |
2478 | #endif | |
101367c2 TG |
2479 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2480 | fib6_rules_init(); | |
2481 | #endif | |
1da177e4 LT |
2482 | } |
2483 | ||
2484 | void ip6_route_cleanup(void) | |
2485 | { | |
101367c2 TG |
2486 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2487 | fib6_rules_cleanup(); | |
2488 | #endif | |
1da177e4 LT |
2489 | #ifdef CONFIG_PROC_FS |
2490 | proc_net_remove("ipv6_route"); | |
2491 | proc_net_remove("rt6_stats"); | |
2492 | #endif | |
2493 | #ifdef CONFIG_XFRM | |
2494 | xfrm6_fini(); | |
2495 | #endif | |
2496 | rt6_ifdown(NULL); | |
2497 | fib6_gc_cleanup(); | |
2498 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2499 | } |