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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | /* Changes: | |
17 | * | |
18 | * YOSHIFUJI Hideaki @USAGI | |
19 | * reworked default router selection. | |
20 | * - respect outgoing interface | |
21 | * - select from (probably) reachable routers (i.e. | |
22 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
23 | * - always select the same router if it is (probably) | |
24 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
25 | * Ville Nuorvala |
26 | * Fixed routing subtrees. | |
1da177e4 LT |
27 | */ |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 LT |
30 | #include <linux/errno.h> |
31 | #include <linux/types.h> | |
32 | #include <linux/times.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/sockios.h> | |
35 | #include <linux/net.h> | |
36 | #include <linux/route.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/in6.h> | |
39 | #include <linux/init.h> | |
1da177e4 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); | |
1ab1457c | 204 | } |
1da177e4 LT |
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) { | |
7cc48263 | 246 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { |
1da177e4 LT |
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; | |
1ab1457c | 255 | if (local && (!oif || |
1da177e4 LT |
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 | */ |
b6f99a21 | 311 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
312 | { |
313 | struct net_device *dev = rt->rt6i_dev; | |
a0d78ebf YH |
314 | int ret = 0; |
315 | ||
316 | if (!oif) | |
317 | return 2; | |
318 | if (dev->flags & IFF_LOOPBACK) { | |
319 | if (!WARN_ON(rt->rt6i_idev == NULL) && | |
320 | rt->rt6i_idev->dev->ifindex == oif) | |
321 | ret = 1; | |
322 | else | |
323 | return 0; | |
324 | } | |
325 | if (dev->ifindex == oif) | |
554cfb7e | 326 | return 2; |
a0d78ebf YH |
327 | |
328 | return ret; | |
554cfb7e | 329 | } |
1da177e4 | 330 | |
b6f99a21 | 331 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 332 | { |
554cfb7e YH |
333 | struct neighbour *neigh = rt->rt6i_nexthop; |
334 | int m = 0; | |
4d0c5911 YH |
335 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
336 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
337 | m = 1; | |
338 | else if (neigh) { | |
554cfb7e YH |
339 | read_lock_bh(&neigh->lock); |
340 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 341 | m = 2; |
ea73ee23 YH |
342 | else if (!(neigh->nud_state & NUD_FAILED)) |
343 | m = 1; | |
554cfb7e | 344 | read_unlock_bh(&neigh->lock); |
1da177e4 | 345 | } |
554cfb7e | 346 | return m; |
1da177e4 LT |
347 | } |
348 | ||
554cfb7e YH |
349 | static int rt6_score_route(struct rt6_info *rt, int oif, |
350 | int strict) | |
1da177e4 | 351 | { |
4d0c5911 | 352 | int m, n; |
1ab1457c | 353 | |
4d0c5911 | 354 | m = rt6_check_dev(rt, oif); |
77d16f45 | 355 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 356 | return -1; |
ebacaaa0 YH |
357 | #ifdef CONFIG_IPV6_ROUTER_PREF |
358 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
359 | #endif | |
4d0c5911 | 360 | n = rt6_check_neigh(rt); |
557e92ef | 361 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
362 | return -1; |
363 | return m; | |
364 | } | |
365 | ||
f11e6659 DM |
366 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
367 | int *mpri, struct rt6_info *match) | |
554cfb7e | 368 | { |
f11e6659 DM |
369 | int m; |
370 | ||
371 | if (rt6_check_expired(rt)) | |
372 | goto out; | |
373 | ||
374 | m = rt6_score_route(rt, oif, strict); | |
375 | if (m < 0) | |
376 | goto out; | |
377 | ||
378 | if (m > *mpri) { | |
379 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
380 | rt6_probe(match); | |
381 | *mpri = m; | |
382 | match = rt; | |
383 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
384 | rt6_probe(rt); | |
385 | } | |
386 | ||
387 | out: | |
388 | return match; | |
389 | } | |
390 | ||
391 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
392 | struct rt6_info *rr_head, | |
393 | u32 metric, int oif, int strict) | |
394 | { | |
395 | struct rt6_info *rt, *match; | |
554cfb7e | 396 | int mpri = -1; |
1da177e4 | 397 | |
f11e6659 DM |
398 | match = NULL; |
399 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
400 | rt = rt->u.dst.rt6_next) | |
401 | match = find_match(rt, oif, strict, &mpri, match); | |
402 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
403 | rt = rt->u.dst.rt6_next) | |
404 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 405 | |
f11e6659 DM |
406 | return match; |
407 | } | |
1da177e4 | 408 | |
f11e6659 DM |
409 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
410 | { | |
411 | struct rt6_info *match, *rt0; | |
1da177e4 | 412 | |
f11e6659 DM |
413 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
414 | __FUNCTION__, fn->leaf, oif); | |
554cfb7e | 415 | |
f11e6659 DM |
416 | rt0 = fn->rr_ptr; |
417 | if (!rt0) | |
418 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 419 | |
f11e6659 | 420 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 421 | |
554cfb7e | 422 | if (!match && |
f11e6659 DM |
423 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
424 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
425 | ||
554cfb7e | 426 | /* no entries matched; do round-robin */ |
f11e6659 DM |
427 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
428 | next = fn->leaf; | |
429 | ||
430 | if (next != rt0) | |
431 | fn->rr_ptr = next; | |
1da177e4 | 432 | } |
1da177e4 | 433 | |
f11e6659 DM |
434 | RT6_TRACE("%s() => %p\n", |
435 | __FUNCTION__, match); | |
1da177e4 | 436 | |
554cfb7e | 437 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
438 | } |
439 | ||
70ceb4f5 YH |
440 | #ifdef CONFIG_IPV6_ROUTE_INFO |
441 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
442 | struct in6_addr *gwaddr) | |
443 | { | |
444 | struct route_info *rinfo = (struct route_info *) opt; | |
445 | struct in6_addr prefix_buf, *prefix; | |
446 | unsigned int pref; | |
447 | u32 lifetime; | |
448 | struct rt6_info *rt; | |
449 | ||
450 | if (len < sizeof(struct route_info)) { | |
451 | return -EINVAL; | |
452 | } | |
453 | ||
454 | /* Sanity check for prefix_len and length */ | |
455 | if (rinfo->length > 3) { | |
456 | return -EINVAL; | |
457 | } else if (rinfo->prefix_len > 128) { | |
458 | return -EINVAL; | |
459 | } else if (rinfo->prefix_len > 64) { | |
460 | if (rinfo->length < 2) { | |
461 | return -EINVAL; | |
462 | } | |
463 | } else if (rinfo->prefix_len > 0) { | |
464 | if (rinfo->length < 1) { | |
465 | return -EINVAL; | |
466 | } | |
467 | } | |
468 | ||
469 | pref = rinfo->route_pref; | |
470 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
471 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
472 | ||
e69a4adc | 473 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
474 | if (lifetime == 0xffffffff) { |
475 | /* infinity */ | |
476 | } else if (lifetime > 0x7fffffff/HZ) { | |
477 | /* Avoid arithmetic overflow */ | |
478 | lifetime = 0x7fffffff/HZ - 1; | |
479 | } | |
480 | ||
481 | if (rinfo->length == 3) | |
482 | prefix = (struct in6_addr *)rinfo->prefix; | |
483 | else { | |
484 | /* this function is safe */ | |
485 | ipv6_addr_prefix(&prefix_buf, | |
486 | (struct in6_addr *)rinfo->prefix, | |
487 | rinfo->prefix_len); | |
488 | prefix = &prefix_buf; | |
489 | } | |
490 | ||
491 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
492 | ||
493 | if (rt && !lifetime) { | |
e0a1ad73 | 494 | ip6_del_rt(rt); |
70ceb4f5 YH |
495 | rt = NULL; |
496 | } | |
497 | ||
498 | if (!rt && lifetime) | |
499 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
500 | pref); | |
501 | else if (rt) | |
502 | rt->rt6i_flags = RTF_ROUTEINFO | | |
503 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
504 | ||
505 | if (rt) { | |
506 | if (lifetime == 0xffffffff) { | |
507 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
508 | } else { | |
509 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
510 | rt->rt6i_flags |= RTF_EXPIRES; | |
511 | } | |
512 | dst_release(&rt->u.dst); | |
513 | } | |
514 | return 0; | |
515 | } | |
516 | #endif | |
517 | ||
982f56f3 YH |
518 | #define BACKTRACK(saddr) \ |
519 | do { \ | |
520 | if (rt == &ip6_null_entry) { \ | |
521 | struct fib6_node *pn; \ | |
e0eda7bb | 522 | while (1) { \ |
982f56f3 YH |
523 | if (fn->fn_flags & RTN_TL_ROOT) \ |
524 | goto out; \ | |
525 | pn = fn->parent; \ | |
526 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 527 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
528 | else \ |
529 | fn = pn; \ | |
530 | if (fn->fn_flags & RTN_RTINFO) \ | |
531 | goto restart; \ | |
c71099ac | 532 | } \ |
c71099ac | 533 | } \ |
982f56f3 | 534 | } while(0) |
c71099ac TG |
535 | |
536 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
537 | struct flowi *fl, int flags) | |
1da177e4 LT |
538 | { |
539 | struct fib6_node *fn; | |
540 | struct rt6_info *rt; | |
541 | ||
c71099ac TG |
542 | read_lock_bh(&table->tb6_lock); |
543 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
544 | restart: | |
545 | rt = fn->leaf; | |
77d16f45 | 546 | rt = rt6_device_match(rt, fl->oif, flags); |
982f56f3 | 547 | BACKTRACK(&fl->fl6_src); |
c71099ac | 548 | out: |
33cc4896 | 549 | dst_hold(&rt->u.dst); |
c71099ac | 550 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
551 | |
552 | rt->u.dst.lastuse = jiffies; | |
c71099ac TG |
553 | rt->u.dst.__use++; |
554 | ||
555 | return rt; | |
556 | ||
557 | } | |
558 | ||
559 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, | |
560 | int oif, int strict) | |
561 | { | |
562 | struct flowi fl = { | |
563 | .oif = oif, | |
564 | .nl_u = { | |
565 | .ip6_u = { | |
566 | .daddr = *daddr, | |
c71099ac TG |
567 | }, |
568 | }, | |
569 | }; | |
570 | struct dst_entry *dst; | |
77d16f45 | 571 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 572 | |
adaa70bb TG |
573 | if (saddr) { |
574 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
575 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
576 | } | |
577 | ||
c71099ac TG |
578 | dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup); |
579 | if (dst->error == 0) | |
580 | return (struct rt6_info *) dst; | |
581 | ||
582 | dst_release(dst); | |
583 | ||
1da177e4 LT |
584 | return NULL; |
585 | } | |
586 | ||
c71099ac | 587 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
588 | It takes new route entry, the addition fails by any reason the |
589 | route is freed. In any case, if caller does not hold it, it may | |
590 | be destroyed. | |
591 | */ | |
592 | ||
86872cb5 | 593 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
594 | { |
595 | int err; | |
c71099ac | 596 | struct fib6_table *table; |
1da177e4 | 597 | |
c71099ac TG |
598 | table = rt->rt6i_table; |
599 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 600 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 601 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
602 | |
603 | return err; | |
604 | } | |
605 | ||
40e22e8f TG |
606 | int ip6_ins_rt(struct rt6_info *rt) |
607 | { | |
86872cb5 | 608 | return __ip6_ins_rt(rt, NULL); |
40e22e8f TG |
609 | } |
610 | ||
95a9a5ba YH |
611 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
612 | struct in6_addr *saddr) | |
1da177e4 | 613 | { |
1da177e4 LT |
614 | struct rt6_info *rt; |
615 | ||
616 | /* | |
617 | * Clone the route. | |
618 | */ | |
619 | ||
620 | rt = ip6_rt_copy(ort); | |
621 | ||
622 | if (rt) { | |
58c4fb86 YH |
623 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
624 | if (rt->rt6i_dst.plen != 128 && | |
625 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
626 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 627 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 628 | } |
1da177e4 | 629 | |
58c4fb86 | 630 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
631 | rt->rt6i_dst.plen = 128; |
632 | rt->rt6i_flags |= RTF_CACHE; | |
633 | rt->u.dst.flags |= DST_HOST; | |
634 | ||
635 | #ifdef CONFIG_IPV6_SUBTREES | |
636 | if (rt->rt6i_src.plen && saddr) { | |
637 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
638 | rt->rt6i_src.plen = 128; | |
639 | } | |
640 | #endif | |
641 | ||
642 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
643 | ||
95a9a5ba | 644 | } |
1da177e4 | 645 | |
95a9a5ba YH |
646 | return rt; |
647 | } | |
1da177e4 | 648 | |
299d9939 YH |
649 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
650 | { | |
651 | struct rt6_info *rt = ip6_rt_copy(ort); | |
652 | if (rt) { | |
653 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
654 | rt->rt6i_dst.plen = 128; | |
655 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
656 | rt->u.dst.flags |= DST_HOST; |
657 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
658 | } | |
659 | return rt; | |
660 | } | |
661 | ||
8ce11e6a AB |
662 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, |
663 | struct flowi *fl, int flags) | |
1da177e4 LT |
664 | { |
665 | struct fib6_node *fn; | |
519fbd87 | 666 | struct rt6_info *rt, *nrt; |
c71099ac | 667 | int strict = 0; |
1da177e4 | 668 | int attempts = 3; |
519fbd87 | 669 | int err; |
ea659e07 | 670 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 671 | |
77d16f45 | 672 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
673 | |
674 | relookup: | |
c71099ac | 675 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 676 | |
8238dd06 | 677 | restart_2: |
c71099ac | 678 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
679 | |
680 | restart: | |
f11e6659 | 681 | rt = rt6_select(fn, fl->iif, strict | reachable); |
982f56f3 | 682 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
683 | if (rt == &ip6_null_entry || |
684 | rt->rt6i_flags & RTF_CACHE) | |
1ddef044 | 685 | goto out; |
1da177e4 | 686 | |
fb9de91e | 687 | dst_hold(&rt->u.dst); |
c71099ac | 688 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 689 | |
519fbd87 | 690 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 691 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
692 | else { |
693 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 694 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
695 | #else |
696 | goto out2; | |
697 | #endif | |
698 | } | |
e40cf353 | 699 | |
519fbd87 YH |
700 | dst_release(&rt->u.dst); |
701 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 702 | |
519fbd87 YH |
703 | dst_hold(&rt->u.dst); |
704 | if (nrt) { | |
40e22e8f | 705 | err = ip6_ins_rt(nrt); |
519fbd87 | 706 | if (!err) |
1da177e4 | 707 | goto out2; |
1da177e4 | 708 | } |
1da177e4 | 709 | |
519fbd87 YH |
710 | if (--attempts <= 0) |
711 | goto out2; | |
712 | ||
713 | /* | |
c71099ac | 714 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
715 | * released someone could insert this route. Relookup. |
716 | */ | |
717 | dst_release(&rt->u.dst); | |
718 | goto relookup; | |
719 | ||
720 | out: | |
8238dd06 YH |
721 | if (reachable) { |
722 | reachable = 0; | |
723 | goto restart_2; | |
724 | } | |
519fbd87 | 725 | dst_hold(&rt->u.dst); |
c71099ac | 726 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
727 | out2: |
728 | rt->u.dst.lastuse = jiffies; | |
729 | rt->u.dst.__use++; | |
c71099ac TG |
730 | |
731 | return rt; | |
1da177e4 LT |
732 | } |
733 | ||
c71099ac TG |
734 | void ip6_route_input(struct sk_buff *skb) |
735 | { | |
736 | struct ipv6hdr *iph = skb->nh.ipv6h; | |
adaa70bb | 737 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
738 | struct flowi fl = { |
739 | .iif = skb->dev->ifindex, | |
740 | .nl_u = { | |
741 | .ip6_u = { | |
742 | .daddr = iph->daddr, | |
743 | .saddr = iph->saddr, | |
90bcaf7b | 744 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
745 | }, |
746 | }, | |
1ab1457c | 747 | .mark = skb->mark, |
c71099ac TG |
748 | .proto = iph->nexthdr, |
749 | }; | |
adaa70bb TG |
750 | |
751 | if (rt6_need_strict(&iph->daddr)) | |
752 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac TG |
753 | |
754 | skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input); | |
755 | } | |
756 | ||
757 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
758 | struct flowi *fl, int flags) | |
1da177e4 LT |
759 | { |
760 | struct fib6_node *fn; | |
519fbd87 | 761 | struct rt6_info *rt, *nrt; |
c71099ac | 762 | int strict = 0; |
1da177e4 | 763 | int attempts = 3; |
519fbd87 | 764 | int err; |
ea659e07 | 765 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 766 | |
77d16f45 | 767 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
768 | |
769 | relookup: | |
c71099ac | 770 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 771 | |
8238dd06 | 772 | restart_2: |
c71099ac | 773 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
774 | |
775 | restart: | |
f11e6659 | 776 | rt = rt6_select(fn, fl->oif, strict | reachable); |
982f56f3 | 777 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
778 | if (rt == &ip6_null_entry || |
779 | rt->rt6i_flags & RTF_CACHE) | |
1da177e4 | 780 | goto out; |
1da177e4 | 781 | |
fb9de91e | 782 | dst_hold(&rt->u.dst); |
c71099ac | 783 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 784 | |
519fbd87 | 785 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
e40cf353 | 786 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
787 | else { |
788 | #if CLONE_OFFLINK_ROUTE | |
789 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); | |
790 | #else | |
791 | goto out2; | |
792 | #endif | |
793 | } | |
1da177e4 | 794 | |
519fbd87 YH |
795 | dst_release(&rt->u.dst); |
796 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 797 | |
519fbd87 YH |
798 | dst_hold(&rt->u.dst); |
799 | if (nrt) { | |
40e22e8f | 800 | err = ip6_ins_rt(nrt); |
519fbd87 | 801 | if (!err) |
1da177e4 | 802 | goto out2; |
1da177e4 | 803 | } |
e40cf353 | 804 | |
519fbd87 YH |
805 | if (--attempts <= 0) |
806 | goto out2; | |
807 | ||
808 | /* | |
c71099ac | 809 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
810 | * released someone could insert this route. Relookup. |
811 | */ | |
812 | dst_release(&rt->u.dst); | |
813 | goto relookup; | |
814 | ||
815 | out: | |
8238dd06 YH |
816 | if (reachable) { |
817 | reachable = 0; | |
818 | goto restart_2; | |
819 | } | |
519fbd87 | 820 | dst_hold(&rt->u.dst); |
c71099ac | 821 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
822 | out2: |
823 | rt->u.dst.lastuse = jiffies; | |
824 | rt->u.dst.__use++; | |
c71099ac TG |
825 | return rt; |
826 | } | |
827 | ||
828 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
829 | { | |
830 | int flags = 0; | |
831 | ||
832 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 833 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 834 | |
adaa70bb TG |
835 | if (!ipv6_addr_any(&fl->fl6_src)) |
836 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
837 | ||
c71099ac | 838 | return fib6_rule_lookup(fl, flags, ip6_pol_route_output); |
1da177e4 LT |
839 | } |
840 | ||
841 | ||
842 | /* | |
843 | * Destination cache support functions | |
844 | */ | |
845 | ||
846 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
847 | { | |
848 | struct rt6_info *rt; | |
849 | ||
850 | rt = (struct rt6_info *) dst; | |
851 | ||
852 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
853 | return dst; | |
854 | ||
855 | return NULL; | |
856 | } | |
857 | ||
858 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
859 | { | |
860 | struct rt6_info *rt = (struct rt6_info *) dst; | |
861 | ||
862 | if (rt) { | |
863 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 864 | ip6_del_rt(rt); |
1da177e4 LT |
865 | else |
866 | dst_release(dst); | |
867 | } | |
868 | return NULL; | |
869 | } | |
870 | ||
871 | static void ip6_link_failure(struct sk_buff *skb) | |
872 | { | |
873 | struct rt6_info *rt; | |
874 | ||
875 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
876 | ||
877 | rt = (struct rt6_info *) skb->dst; | |
878 | if (rt) { | |
879 | if (rt->rt6i_flags&RTF_CACHE) { | |
880 | dst_set_expires(&rt->u.dst, 0); | |
881 | rt->rt6i_flags |= RTF_EXPIRES; | |
882 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
883 | rt->rt6i_node->fn_sernum = -1; | |
884 | } | |
885 | } | |
886 | ||
887 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
888 | { | |
889 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
890 | ||
891 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
892 | rt6->rt6i_flags |= RTF_MODIFIED; | |
893 | if (mtu < IPV6_MIN_MTU) { | |
894 | mtu = IPV6_MIN_MTU; | |
895 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
896 | } | |
897 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 898 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
899 | } |
900 | } | |
901 | ||
1da177e4 LT |
902 | static int ipv6_get_mtu(struct net_device *dev); |
903 | ||
904 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
905 | { | |
906 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
907 | ||
908 | if (mtu < ip6_rt_min_advmss) | |
909 | mtu = ip6_rt_min_advmss; | |
910 | ||
911 | /* | |
1ab1457c YH |
912 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
913 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
914 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
915 | * rely only on pmtu discovery" |
916 | */ | |
917 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
918 | mtu = IPV6_MAXPLEN; | |
919 | return mtu; | |
920 | } | |
921 | ||
5d0bbeeb | 922 | static struct dst_entry *ndisc_dst_gc_list; |
8ce11e6a | 923 | static DEFINE_SPINLOCK(ndisc_lock); |
5d0bbeeb | 924 | |
1ab1457c | 925 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, |
1da177e4 LT |
926 | struct neighbour *neigh, |
927 | struct in6_addr *addr, | |
928 | int (*output)(struct sk_buff *)) | |
929 | { | |
930 | struct rt6_info *rt; | |
931 | struct inet6_dev *idev = in6_dev_get(dev); | |
932 | ||
933 | if (unlikely(idev == NULL)) | |
934 | return NULL; | |
935 | ||
936 | rt = ip6_dst_alloc(); | |
937 | if (unlikely(rt == NULL)) { | |
938 | in6_dev_put(idev); | |
939 | goto out; | |
940 | } | |
941 | ||
942 | dev_hold(dev); | |
943 | if (neigh) | |
944 | neigh_hold(neigh); | |
945 | else | |
946 | neigh = ndisc_get_neigh(dev, addr); | |
947 | ||
948 | rt->rt6i_dev = dev; | |
949 | rt->rt6i_idev = idev; | |
950 | rt->rt6i_nexthop = neigh; | |
951 | atomic_set(&rt->u.dst.__refcnt, 1); | |
952 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
953 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
954 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
955 | rt->u.dst.output = output; | |
956 | ||
957 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
958 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
959 | ? DST_HOST | |
1da177e4 LT |
960 | : 0; |
961 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
962 | rt->rt6i_dst.plen = 128; | |
963 | #endif | |
964 | ||
5d0bbeeb | 965 | spin_lock_bh(&ndisc_lock); |
1da177e4 LT |
966 | rt->u.dst.next = ndisc_dst_gc_list; |
967 | ndisc_dst_gc_list = &rt->u.dst; | |
5d0bbeeb | 968 | spin_unlock_bh(&ndisc_lock); |
1da177e4 LT |
969 | |
970 | fib6_force_start_gc(); | |
971 | ||
972 | out: | |
40aa7b90 | 973 | return &rt->u.dst; |
1da177e4 LT |
974 | } |
975 | ||
976 | int ndisc_dst_gc(int *more) | |
977 | { | |
978 | struct dst_entry *dst, *next, **pprev; | |
979 | int freed; | |
980 | ||
981 | next = NULL; | |
1ab1457c | 982 | freed = 0; |
5d0bbeeb TG |
983 | |
984 | spin_lock_bh(&ndisc_lock); | |
1da177e4 | 985 | pprev = &ndisc_dst_gc_list; |
5d0bbeeb | 986 | |
1da177e4 LT |
987 | while ((dst = *pprev) != NULL) { |
988 | if (!atomic_read(&dst->__refcnt)) { | |
989 | *pprev = dst->next; | |
990 | dst_free(dst); | |
991 | freed++; | |
992 | } else { | |
993 | pprev = &dst->next; | |
994 | (*more)++; | |
995 | } | |
996 | } | |
997 | ||
5d0bbeeb TG |
998 | spin_unlock_bh(&ndisc_lock); |
999 | ||
1da177e4 LT |
1000 | return freed; |
1001 | } | |
1002 | ||
1003 | static int ip6_dst_gc(void) | |
1004 | { | |
1005 | static unsigned expire = 30*HZ; | |
1006 | static unsigned long last_gc; | |
1007 | unsigned long now = jiffies; | |
1008 | ||
1009 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && | |
1010 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) | |
1011 | goto out; | |
1012 | ||
1013 | expire++; | |
1014 | fib6_run_gc(expire); | |
1015 | last_gc = now; | |
1016 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
1017 | expire = ip6_rt_gc_timeout>>1; | |
1018 | ||
1019 | out: | |
1020 | expire -= expire>>ip6_rt_gc_elasticity; | |
1021 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); | |
1022 | } | |
1023 | ||
1024 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1025 | but results in cleaner routing tables. | |
1026 | ||
1027 | Remove it only when all the things will work! | |
1028 | */ | |
1029 | ||
1030 | static int ipv6_get_mtu(struct net_device *dev) | |
1031 | { | |
1032 | int mtu = IPV6_MIN_MTU; | |
1033 | struct inet6_dev *idev; | |
1034 | ||
1035 | idev = in6_dev_get(dev); | |
1036 | if (idev) { | |
1037 | mtu = idev->cnf.mtu6; | |
1038 | in6_dev_put(idev); | |
1039 | } | |
1040 | return mtu; | |
1041 | } | |
1042 | ||
1043 | int ipv6_get_hoplimit(struct net_device *dev) | |
1044 | { | |
1045 | int hoplimit = ipv6_devconf.hop_limit; | |
1046 | struct inet6_dev *idev; | |
1047 | ||
1048 | idev = in6_dev_get(dev); | |
1049 | if (idev) { | |
1050 | hoplimit = idev->cnf.hop_limit; | |
1051 | in6_dev_put(idev); | |
1052 | } | |
1053 | return hoplimit; | |
1054 | } | |
1055 | ||
1056 | /* | |
1057 | * | |
1058 | */ | |
1059 | ||
86872cb5 | 1060 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1061 | { |
1062 | int err; | |
1da177e4 LT |
1063 | struct rt6_info *rt = NULL; |
1064 | struct net_device *dev = NULL; | |
1065 | struct inet6_dev *idev = NULL; | |
c71099ac | 1066 | struct fib6_table *table; |
1da177e4 LT |
1067 | int addr_type; |
1068 | ||
86872cb5 | 1069 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1070 | return -EINVAL; |
1071 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1072 | if (cfg->fc_src_len) |
1da177e4 LT |
1073 | return -EINVAL; |
1074 | #endif | |
86872cb5 | 1075 | if (cfg->fc_ifindex) { |
1da177e4 | 1076 | err = -ENODEV; |
86872cb5 | 1077 | dev = dev_get_by_index(cfg->fc_ifindex); |
1da177e4 LT |
1078 | if (!dev) |
1079 | goto out; | |
1080 | idev = in6_dev_get(dev); | |
1081 | if (!idev) | |
1082 | goto out; | |
1083 | } | |
1084 | ||
86872cb5 TG |
1085 | if (cfg->fc_metric == 0) |
1086 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1087 | |
86872cb5 | 1088 | table = fib6_new_table(cfg->fc_table); |
c71099ac TG |
1089 | if (table == NULL) { |
1090 | err = -ENOBUFS; | |
1091 | goto out; | |
1092 | } | |
1093 | ||
1da177e4 LT |
1094 | rt = ip6_dst_alloc(); |
1095 | ||
1096 | if (rt == NULL) { | |
1097 | err = -ENOMEM; | |
1098 | goto out; | |
1099 | } | |
1100 | ||
1101 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1102 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1103 | |
86872cb5 TG |
1104 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1105 | cfg->fc_protocol = RTPROT_BOOT; | |
1106 | rt->rt6i_protocol = cfg->fc_protocol; | |
1107 | ||
1108 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1109 | |
1110 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1111 | rt->u.dst.input = ip6_mc_input; | |
1112 | else | |
1113 | rt->u.dst.input = ip6_forward; | |
1114 | ||
1115 | rt->u.dst.output = ip6_output; | |
1116 | ||
86872cb5 TG |
1117 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1118 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1119 | if (rt->rt6i_dst.plen == 128) |
1120 | rt->u.dst.flags = DST_HOST; | |
1121 | ||
1122 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1123 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1124 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1125 | #endif |
1126 | ||
86872cb5 | 1127 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1128 | |
1129 | /* We cannot add true routes via loopback here, | |
1130 | they would result in kernel looping; promote them to reject routes | |
1131 | */ | |
86872cb5 | 1132 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1133 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1134 | /* hold loopback dev/idev if we haven't done so. */ | |
1135 | if (dev != &loopback_dev) { | |
1136 | if (dev) { | |
1137 | dev_put(dev); | |
1138 | in6_dev_put(idev); | |
1139 | } | |
1140 | dev = &loopback_dev; | |
1141 | dev_hold(dev); | |
1142 | idev = in6_dev_get(dev); | |
1143 | if (!idev) { | |
1144 | err = -ENODEV; | |
1145 | goto out; | |
1146 | } | |
1147 | } | |
1148 | rt->u.dst.output = ip6_pkt_discard_out; | |
1149 | rt->u.dst.input = ip6_pkt_discard; | |
1150 | rt->u.dst.error = -ENETUNREACH; | |
1151 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1152 | goto install_route; | |
1153 | } | |
1154 | ||
86872cb5 | 1155 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1156 | struct in6_addr *gw_addr; |
1157 | int gwa_type; | |
1158 | ||
86872cb5 TG |
1159 | gw_addr = &cfg->fc_gateway; |
1160 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1161 | gwa_type = ipv6_addr_type(gw_addr); |
1162 | ||
1163 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1164 | struct rt6_info *grt; | |
1165 | ||
1166 | /* IPv6 strictly inhibits using not link-local | |
1167 | addresses as nexthop address. | |
1168 | Otherwise, router will not able to send redirects. | |
1169 | It is very good, but in some (rare!) circumstances | |
1170 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1171 | some exceptions. --ANK | |
1172 | */ | |
1173 | err = -EINVAL; | |
1174 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1175 | goto out; | |
1176 | ||
86872cb5 | 1177 | grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1178 | |
1179 | err = -EHOSTUNREACH; | |
1180 | if (grt == NULL) | |
1181 | goto out; | |
1182 | if (dev) { | |
1183 | if (dev != grt->rt6i_dev) { | |
1184 | dst_release(&grt->u.dst); | |
1185 | goto out; | |
1186 | } | |
1187 | } else { | |
1188 | dev = grt->rt6i_dev; | |
1189 | idev = grt->rt6i_idev; | |
1190 | dev_hold(dev); | |
1191 | in6_dev_hold(grt->rt6i_idev); | |
1192 | } | |
1193 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1194 | err = 0; | |
1195 | dst_release(&grt->u.dst); | |
1196 | ||
1197 | if (err) | |
1198 | goto out; | |
1199 | } | |
1200 | err = -EINVAL; | |
1201 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1202 | goto out; | |
1203 | } | |
1204 | ||
1205 | err = -ENODEV; | |
1206 | if (dev == NULL) | |
1207 | goto out; | |
1208 | ||
86872cb5 | 1209 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1210 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1211 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1212 | err = PTR_ERR(rt->rt6i_nexthop); | |
1213 | rt->rt6i_nexthop = NULL; | |
1214 | goto out; | |
1215 | } | |
1216 | } | |
1217 | ||
86872cb5 | 1218 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1219 | |
1220 | install_route: | |
86872cb5 TG |
1221 | if (cfg->fc_mx) { |
1222 | struct nlattr *nla; | |
1223 | int remaining; | |
1224 | ||
1225 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1226 | int type = nla->nla_type; | |
1227 | ||
1228 | if (type) { | |
1229 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1230 | err = -EINVAL; |
1231 | goto out; | |
1232 | } | |
86872cb5 TG |
1233 | |
1234 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1235 | } |
1da177e4 LT |
1236 | } |
1237 | } | |
1238 | ||
1239 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1240 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1241 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1242 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1243 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1244 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1245 | rt->u.dst.dev = dev; | |
1246 | rt->rt6i_idev = idev; | |
c71099ac | 1247 | rt->rt6i_table = table; |
86872cb5 | 1248 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1249 | |
1250 | out: | |
1251 | if (dev) | |
1252 | dev_put(dev); | |
1253 | if (idev) | |
1254 | in6_dev_put(idev); | |
1255 | if (rt) | |
40aa7b90 | 1256 | dst_free(&rt->u.dst); |
1da177e4 LT |
1257 | return err; |
1258 | } | |
1259 | ||
86872cb5 | 1260 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1261 | { |
1262 | int err; | |
c71099ac | 1263 | struct fib6_table *table; |
1da177e4 | 1264 | |
6c813a72 PM |
1265 | if (rt == &ip6_null_entry) |
1266 | return -ENOENT; | |
1267 | ||
c71099ac TG |
1268 | table = rt->rt6i_table; |
1269 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1270 | |
86872cb5 | 1271 | err = fib6_del(rt, info); |
1da177e4 LT |
1272 | dst_release(&rt->u.dst); |
1273 | ||
c71099ac | 1274 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1275 | |
1276 | return err; | |
1277 | } | |
1278 | ||
e0a1ad73 TG |
1279 | int ip6_del_rt(struct rt6_info *rt) |
1280 | { | |
86872cb5 | 1281 | return __ip6_del_rt(rt, NULL); |
e0a1ad73 TG |
1282 | } |
1283 | ||
86872cb5 | 1284 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1285 | { |
c71099ac | 1286 | struct fib6_table *table; |
1da177e4 LT |
1287 | struct fib6_node *fn; |
1288 | struct rt6_info *rt; | |
1289 | int err = -ESRCH; | |
1290 | ||
86872cb5 | 1291 | table = fib6_get_table(cfg->fc_table); |
c71099ac TG |
1292 | if (table == NULL) |
1293 | return err; | |
1294 | ||
1295 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1296 | |
c71099ac | 1297 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1298 | &cfg->fc_dst, cfg->fc_dst_len, |
1299 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1300 | |
1da177e4 | 1301 | if (fn) { |
7cc48263 | 1302 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1303 | if (cfg->fc_ifindex && |
1da177e4 | 1304 | (rt->rt6i_dev == NULL || |
86872cb5 | 1305 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1306 | continue; |
86872cb5 TG |
1307 | if (cfg->fc_flags & RTF_GATEWAY && |
1308 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1309 | continue; |
86872cb5 | 1310 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1311 | continue; |
1312 | dst_hold(&rt->u.dst); | |
c71099ac | 1313 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1314 | |
86872cb5 | 1315 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1316 | } |
1317 | } | |
c71099ac | 1318 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1319 | |
1320 | return err; | |
1321 | } | |
1322 | ||
1323 | /* | |
1324 | * Handle redirects | |
1325 | */ | |
a6279458 YH |
1326 | struct ip6rd_flowi { |
1327 | struct flowi fl; | |
1328 | struct in6_addr gateway; | |
1329 | }; | |
1330 | ||
1331 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1332 | struct flowi *fl, | |
1333 | int flags) | |
1da177e4 | 1334 | { |
a6279458 YH |
1335 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1336 | struct rt6_info *rt; | |
e843b9e1 | 1337 | struct fib6_node *fn; |
c71099ac | 1338 | |
1da177e4 | 1339 | /* |
e843b9e1 YH |
1340 | * Get the "current" route for this destination and |
1341 | * check if the redirect has come from approriate router. | |
1342 | * | |
1343 | * RFC 2461 specifies that redirects should only be | |
1344 | * accepted if they come from the nexthop to the target. | |
1345 | * Due to the way the routes are chosen, this notion | |
1346 | * is a bit fuzzy and one might need to check all possible | |
1347 | * routes. | |
1da177e4 | 1348 | */ |
1da177e4 | 1349 | |
c71099ac | 1350 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1351 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1352 | restart: |
7cc48263 | 1353 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1354 | /* |
1355 | * Current route is on-link; redirect is always invalid. | |
1356 | * | |
1357 | * Seems, previous statement is not true. It could | |
1358 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1359 | * But then router serving it might decide, that we should | |
1360 | * know truth 8)8) --ANK (980726). | |
1361 | */ | |
1362 | if (rt6_check_expired(rt)) | |
1363 | continue; | |
1364 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1365 | continue; | |
a6279458 | 1366 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1367 | continue; |
a6279458 | 1368 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1369 | continue; |
1370 | break; | |
1371 | } | |
a6279458 | 1372 | |
cb15d9c2 | 1373 | if (!rt) |
a6279458 | 1374 | rt = &ip6_null_entry; |
cb15d9c2 YH |
1375 | BACKTRACK(&fl->fl6_src); |
1376 | out: | |
a6279458 YH |
1377 | dst_hold(&rt->u.dst); |
1378 | ||
c71099ac | 1379 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1380 | |
a6279458 YH |
1381 | return rt; |
1382 | }; | |
1383 | ||
1384 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1385 | struct in6_addr *src, | |
1386 | struct in6_addr *gateway, | |
1387 | struct net_device *dev) | |
1388 | { | |
adaa70bb | 1389 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
a6279458 YH |
1390 | struct ip6rd_flowi rdfl = { |
1391 | .fl = { | |
1392 | .oif = dev->ifindex, | |
1393 | .nl_u = { | |
1394 | .ip6_u = { | |
1395 | .daddr = *dest, | |
1396 | .saddr = *src, | |
1397 | }, | |
1398 | }, | |
1399 | }, | |
1400 | .gateway = *gateway, | |
1401 | }; | |
adaa70bb TG |
1402 | |
1403 | if (rt6_need_strict(dest)) | |
1404 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 YH |
1405 | |
1406 | return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect); | |
1407 | } | |
1408 | ||
1409 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1410 | struct in6_addr *saddr, | |
1411 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1412 | { | |
1413 | struct rt6_info *rt, *nrt = NULL; | |
1414 | struct netevent_redirect netevent; | |
1415 | ||
1416 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1417 | ||
1418 | if (rt == &ip6_null_entry) { | |
1da177e4 LT |
1419 | if (net_ratelimit()) |
1420 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1421 | "for redirect target\n"); | |
a6279458 | 1422 | goto out; |
1da177e4 LT |
1423 | } |
1424 | ||
1da177e4 LT |
1425 | /* |
1426 | * We have finally decided to accept it. | |
1427 | */ | |
1428 | ||
1ab1457c | 1429 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1430 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1431 | NEIGH_UPDATE_F_OVERRIDE| | |
1432 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1433 | NEIGH_UPDATE_F_ISROUTER)) | |
1434 | ); | |
1435 | ||
1436 | /* | |
1437 | * Redirect received -> path was valid. | |
1438 | * Look, redirects are sent only in response to data packets, | |
1439 | * so that this nexthop apparently is reachable. --ANK | |
1440 | */ | |
1441 | dst_confirm(&rt->u.dst); | |
1442 | ||
1443 | /* Duplicate redirect: silently ignore. */ | |
1444 | if (neigh == rt->u.dst.neighbour) | |
1445 | goto out; | |
1446 | ||
1447 | nrt = ip6_rt_copy(rt); | |
1448 | if (nrt == NULL) | |
1449 | goto out; | |
1450 | ||
1451 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1452 | if (on_link) | |
1453 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1454 | ||
1455 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1456 | nrt->rt6i_dst.plen = 128; | |
1457 | nrt->u.dst.flags |= DST_HOST; | |
1458 | ||
1459 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1460 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1461 | /* Reset pmtu, it may be better */ | |
1462 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1463 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1464 | ||
40e22e8f | 1465 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1466 | goto out; |
1467 | ||
8d71740c TT |
1468 | netevent.old = &rt->u.dst; |
1469 | netevent.new = &nrt->u.dst; | |
1470 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1471 | ||
1da177e4 | 1472 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1473 | ip6_del_rt(rt); |
1da177e4 LT |
1474 | return; |
1475 | } | |
1476 | ||
1477 | out: | |
1ab1457c | 1478 | dst_release(&rt->u.dst); |
1da177e4 LT |
1479 | return; |
1480 | } | |
1481 | ||
1482 | /* | |
1483 | * Handle ICMP "packet too big" messages | |
1484 | * i.e. Path MTU discovery | |
1485 | */ | |
1486 | ||
1487 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1488 | struct net_device *dev, u32 pmtu) | |
1489 | { | |
1490 | struct rt6_info *rt, *nrt; | |
1491 | int allfrag = 0; | |
1492 | ||
1493 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1494 | if (rt == NULL) | |
1495 | return; | |
1496 | ||
1497 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1498 | goto out; | |
1499 | ||
1500 | if (pmtu < IPV6_MIN_MTU) { | |
1501 | /* | |
1ab1457c | 1502 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1503 | * MTU (1280) and a fragment header should always be included |
1504 | * after a node receiving Too Big message reporting PMTU is | |
1505 | * less than the IPv6 Minimum Link MTU. | |
1506 | */ | |
1507 | pmtu = IPV6_MIN_MTU; | |
1508 | allfrag = 1; | |
1509 | } | |
1510 | ||
1511 | /* New mtu received -> path was valid. | |
1512 | They are sent only in response to data packets, | |
1513 | so that this nexthop apparently is reachable. --ANK | |
1514 | */ | |
1515 | dst_confirm(&rt->u.dst); | |
1516 | ||
1517 | /* Host route. If it is static, it would be better | |
1518 | not to override it, but add new one, so that | |
1519 | when cache entry will expire old pmtu | |
1520 | would return automatically. | |
1521 | */ | |
1522 | if (rt->rt6i_flags & RTF_CACHE) { | |
1523 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1524 | if (allfrag) | |
1525 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1526 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); | |
1527 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; | |
1528 | goto out; | |
1529 | } | |
1530 | ||
1531 | /* Network route. | |
1532 | Two cases are possible: | |
1533 | 1. It is connected route. Action: COW | |
1534 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1535 | */ | |
d5315b50 | 1536 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1537 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1538 | else |
1539 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1540 | |
d5315b50 | 1541 | if (nrt) { |
a1e78363 YH |
1542 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1543 | if (allfrag) | |
1544 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1545 | ||
1546 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1547 | * happened within 5 mins, the recommended timer is 10 mins. | |
1548 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1549 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1550 | * and detecting PMTU increase will be automatically happened. | |
1551 | */ | |
1552 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); | |
1553 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; | |
1554 | ||
40e22e8f | 1555 | ip6_ins_rt(nrt); |
1da177e4 | 1556 | } |
1da177e4 LT |
1557 | out: |
1558 | dst_release(&rt->u.dst); | |
1559 | } | |
1560 | ||
1561 | /* | |
1562 | * Misc support functions | |
1563 | */ | |
1564 | ||
1565 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1566 | { | |
1567 | struct rt6_info *rt = ip6_dst_alloc(); | |
1568 | ||
1569 | if (rt) { | |
1570 | rt->u.dst.input = ort->u.dst.input; | |
1571 | rt->u.dst.output = ort->u.dst.output; | |
1572 | ||
1573 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1574 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1575 | rt->u.dst.dev = ort->u.dst.dev; |
1576 | if (rt->u.dst.dev) | |
1577 | dev_hold(rt->u.dst.dev); | |
1578 | rt->rt6i_idev = ort->rt6i_idev; | |
1579 | if (rt->rt6i_idev) | |
1580 | in6_dev_hold(rt->rt6i_idev); | |
1581 | rt->u.dst.lastuse = jiffies; | |
1582 | rt->rt6i_expires = 0; | |
1583 | ||
1584 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1585 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1586 | rt->rt6i_metric = 0; | |
1587 | ||
1588 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1589 | #ifdef CONFIG_IPV6_SUBTREES | |
1590 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1591 | #endif | |
c71099ac | 1592 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1593 | } |
1594 | return rt; | |
1595 | } | |
1596 | ||
70ceb4f5 YH |
1597 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1598 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1599 | struct in6_addr *gwaddr, int ifindex) | |
1600 | { | |
1601 | struct fib6_node *fn; | |
1602 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1603 | struct fib6_table *table; |
1604 | ||
1605 | table = fib6_get_table(RT6_TABLE_INFO); | |
1606 | if (table == NULL) | |
1607 | return NULL; | |
70ceb4f5 | 1608 | |
c71099ac TG |
1609 | write_lock_bh(&table->tb6_lock); |
1610 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1611 | if (!fn) |
1612 | goto out; | |
1613 | ||
7cc48263 | 1614 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1615 | if (rt->rt6i_dev->ifindex != ifindex) |
1616 | continue; | |
1617 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1618 | continue; | |
1619 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1620 | continue; | |
1621 | dst_hold(&rt->u.dst); | |
1622 | break; | |
1623 | } | |
1624 | out: | |
c71099ac | 1625 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1626 | return rt; |
1627 | } | |
1628 | ||
1629 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1630 | struct in6_addr *gwaddr, int ifindex, | |
1631 | unsigned pref) | |
1632 | { | |
86872cb5 TG |
1633 | struct fib6_config cfg = { |
1634 | .fc_table = RT6_TABLE_INFO, | |
1635 | .fc_metric = 1024, | |
1636 | .fc_ifindex = ifindex, | |
1637 | .fc_dst_len = prefixlen, | |
1638 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1639 | RTF_UP | RTF_PREF(pref), | |
1640 | }; | |
1641 | ||
1642 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1643 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1644 | |
e317da96 YH |
1645 | /* We should treat it as a default route if prefix length is 0. */ |
1646 | if (!prefixlen) | |
86872cb5 | 1647 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1648 | |
86872cb5 | 1649 | ip6_route_add(&cfg); |
70ceb4f5 YH |
1650 | |
1651 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1652 | } | |
1653 | #endif | |
1654 | ||
1da177e4 | 1655 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1656 | { |
1da177e4 | 1657 | struct rt6_info *rt; |
c71099ac | 1658 | struct fib6_table *table; |
1da177e4 | 1659 | |
c71099ac TG |
1660 | table = fib6_get_table(RT6_TABLE_DFLT); |
1661 | if (table == NULL) | |
1662 | return NULL; | |
1da177e4 | 1663 | |
c71099ac | 1664 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1665 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1666 | if (dev == rt->rt6i_dev && |
045927ff | 1667 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1668 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1669 | break; | |
1670 | } | |
1671 | if (rt) | |
1672 | dst_hold(&rt->u.dst); | |
c71099ac | 1673 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1674 | return rt; |
1675 | } | |
1676 | ||
1677 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1678 | struct net_device *dev, |
1679 | unsigned int pref) | |
1da177e4 | 1680 | { |
86872cb5 TG |
1681 | struct fib6_config cfg = { |
1682 | .fc_table = RT6_TABLE_DFLT, | |
1683 | .fc_metric = 1024, | |
1684 | .fc_ifindex = dev->ifindex, | |
1685 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1686 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
1687 | }; | |
1da177e4 | 1688 | |
86872cb5 | 1689 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1690 | |
86872cb5 | 1691 | ip6_route_add(&cfg); |
1da177e4 | 1692 | |
1da177e4 LT |
1693 | return rt6_get_dflt_router(gwaddr, dev); |
1694 | } | |
1695 | ||
1696 | void rt6_purge_dflt_routers(void) | |
1697 | { | |
1698 | struct rt6_info *rt; | |
c71099ac TG |
1699 | struct fib6_table *table; |
1700 | ||
1701 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
1702 | table = fib6_get_table(RT6_TABLE_DFLT); | |
1703 | if (table == NULL) | |
1704 | return; | |
1da177e4 LT |
1705 | |
1706 | restart: | |
c71099ac | 1707 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1708 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1709 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1710 | dst_hold(&rt->u.dst); | |
c71099ac | 1711 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1712 | ip6_del_rt(rt); |
1da177e4 LT |
1713 | goto restart; |
1714 | } | |
1715 | } | |
c71099ac | 1716 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1717 | } |
1718 | ||
86872cb5 TG |
1719 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, |
1720 | struct fib6_config *cfg) | |
1721 | { | |
1722 | memset(cfg, 0, sizeof(*cfg)); | |
1723 | ||
1724 | cfg->fc_table = RT6_TABLE_MAIN; | |
1725 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1726 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1727 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1728 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1729 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1730 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1731 | ||
1732 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); | |
1733 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1734 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1735 | } | |
1736 | ||
1da177e4 LT |
1737 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
1738 | { | |
86872cb5 | 1739 | struct fib6_config cfg; |
1da177e4 LT |
1740 | struct in6_rtmsg rtmsg; |
1741 | int err; | |
1742 | ||
1743 | switch(cmd) { | |
1744 | case SIOCADDRT: /* Add a route */ | |
1745 | case SIOCDELRT: /* Delete a route */ | |
1746 | if (!capable(CAP_NET_ADMIN)) | |
1747 | return -EPERM; | |
1748 | err = copy_from_user(&rtmsg, arg, | |
1749 | sizeof(struct in6_rtmsg)); | |
1750 | if (err) | |
1751 | return -EFAULT; | |
86872cb5 TG |
1752 | |
1753 | rtmsg_to_fib6_config(&rtmsg, &cfg); | |
1754 | ||
1da177e4 LT |
1755 | rtnl_lock(); |
1756 | switch (cmd) { | |
1757 | case SIOCADDRT: | |
86872cb5 | 1758 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1759 | break; |
1760 | case SIOCDELRT: | |
86872cb5 | 1761 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1762 | break; |
1763 | default: | |
1764 | err = -EINVAL; | |
1765 | } | |
1766 | rtnl_unlock(); | |
1767 | ||
1768 | return err; | |
1769 | }; | |
1770 | ||
1771 | return -EINVAL; | |
1772 | } | |
1773 | ||
1774 | /* | |
1775 | * Drop the packet on the floor | |
1776 | */ | |
1777 | ||
9ce8ade0 | 1778 | static inline int ip6_pkt_drop(struct sk_buff *skb, int code) |
1da177e4 | 1779 | { |
76d0cc1b LL |
1780 | int type = ipv6_addr_type(&skb->nh.ipv6h->daddr); |
1781 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) | |
a11d206d | 1782 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); |
76d0cc1b | 1783 | |
a11d206d | 1784 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 | 1785 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1786 | kfree_skb(skb); |
1787 | return 0; | |
1788 | } | |
1789 | ||
9ce8ade0 TG |
1790 | static int ip6_pkt_discard(struct sk_buff *skb) |
1791 | { | |
1792 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE); | |
1793 | } | |
1794 | ||
20380731 | 1795 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1796 | { |
1797 | skb->dev = skb->dst->dev; | |
1798 | return ip6_pkt_discard(skb); | |
1799 | } | |
1800 | ||
6723ab54 DM |
1801 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1802 | ||
9ce8ade0 TG |
1803 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1804 | { | |
1805 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED); | |
1806 | } | |
1807 | ||
1808 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1809 | { | |
1810 | skb->dev = skb->dst->dev; | |
1811 | return ip6_pkt_prohibit(skb); | |
1812 | } | |
1813 | ||
1814 | static int ip6_pkt_blk_hole(struct sk_buff *skb) | |
1815 | { | |
1816 | kfree_skb(skb); | |
1817 | return 0; | |
1818 | } | |
1819 | ||
6723ab54 DM |
1820 | #endif |
1821 | ||
1da177e4 LT |
1822 | /* |
1823 | * Allocate a dst for local (unicast / anycast) address. | |
1824 | */ | |
1825 | ||
1826 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1827 | const struct in6_addr *addr, | |
1828 | int anycast) | |
1829 | { | |
1830 | struct rt6_info *rt = ip6_dst_alloc(); | |
1831 | ||
1832 | if (rt == NULL) | |
1833 | return ERR_PTR(-ENOMEM); | |
1834 | ||
1835 | dev_hold(&loopback_dev); | |
1836 | in6_dev_hold(idev); | |
1837 | ||
1838 | rt->u.dst.flags = DST_HOST; | |
1839 | rt->u.dst.input = ip6_input; | |
1840 | rt->u.dst.output = ip6_output; | |
1841 | rt->rt6i_dev = &loopback_dev; | |
1842 | rt->rt6i_idev = idev; | |
1843 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1844 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1845 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1846 | rt->u.dst.obsolete = -1; | |
1847 | ||
1848 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1849 | if (anycast) |
1850 | rt->rt6i_flags |= RTF_ANYCAST; | |
1851 | else | |
1da177e4 LT |
1852 | rt->rt6i_flags |= RTF_LOCAL; |
1853 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1854 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1855 | dst_free(&rt->u.dst); |
1da177e4 LT |
1856 | return ERR_PTR(-ENOMEM); |
1857 | } | |
1858 | ||
1859 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1860 | rt->rt6i_dst.plen = 128; | |
c71099ac | 1861 | rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL); |
1da177e4 LT |
1862 | |
1863 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1864 | ||
1865 | return rt; | |
1866 | } | |
1867 | ||
1868 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1869 | { | |
1870 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1871 | rt != &ip6_null_entry) { | |
1872 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1873 | return -1; | |
1874 | } | |
1875 | return 0; | |
1876 | } | |
1877 | ||
1878 | void rt6_ifdown(struct net_device *dev) | |
1879 | { | |
c71099ac | 1880 | fib6_clean_all(fib6_ifdown, 0, dev); |
1da177e4 LT |
1881 | } |
1882 | ||
1883 | struct rt6_mtu_change_arg | |
1884 | { | |
1885 | struct net_device *dev; | |
1886 | unsigned mtu; | |
1887 | }; | |
1888 | ||
1889 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1890 | { | |
1891 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1892 | struct inet6_dev *idev; | |
1893 | ||
1894 | /* In IPv6 pmtu discovery is not optional, | |
1895 | so that RTAX_MTU lock cannot disable it. | |
1896 | We still use this lock to block changes | |
1897 | caused by addrconf/ndisc. | |
1898 | */ | |
1899 | ||
1900 | idev = __in6_dev_get(arg->dev); | |
1901 | if (idev == NULL) | |
1902 | return 0; | |
1903 | ||
1904 | /* For administrative MTU increase, there is no way to discover | |
1905 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1906 | Since RFC 1981 doesn't include administrative MTU increase | |
1907 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1908 | */ | |
1909 | /* | |
1910 | If new MTU is less than route PMTU, this new MTU will be the | |
1911 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1912 | decreases; if new MTU is greater than route PMTU, and the | |
1913 | old MTU is the lowest MTU in the path, update the route PMTU | |
1914 | to reflect the increase. In this case if the other nodes' MTU | |
1915 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1916 | PMTU discouvery. | |
1917 | */ | |
1918 | if (rt->rt6i_dev == arg->dev && | |
1919 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
1ab1457c YH |
1920 | (dst_mtu(&rt->u.dst) > arg->mtu || |
1921 | (dst_mtu(&rt->u.dst) < arg->mtu && | |
1da177e4 LT |
1922 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) |
1923 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; | |
1924 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); | |
1925 | return 0; | |
1926 | } | |
1927 | ||
1928 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1929 | { | |
c71099ac TG |
1930 | struct rt6_mtu_change_arg arg = { |
1931 | .dev = dev, | |
1932 | .mtu = mtu, | |
1933 | }; | |
1da177e4 | 1934 | |
c71099ac | 1935 | fib6_clean_all(rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1936 | } |
1937 | ||
86872cb5 | 1938 | static struct nla_policy rtm_ipv6_policy[RTA_MAX+1] __read_mostly = { |
5176f91e | 1939 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1940 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1941 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1942 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1943 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1944 | }; | |
1945 | ||
1946 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1947 | struct fib6_config *cfg) | |
1da177e4 | 1948 | { |
86872cb5 TG |
1949 | struct rtmsg *rtm; |
1950 | struct nlattr *tb[RTA_MAX+1]; | |
1951 | int err; | |
1da177e4 | 1952 | |
86872cb5 TG |
1953 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1954 | if (err < 0) | |
1955 | goto errout; | |
1da177e4 | 1956 | |
86872cb5 TG |
1957 | err = -EINVAL; |
1958 | rtm = nlmsg_data(nlh); | |
1959 | memset(cfg, 0, sizeof(*cfg)); | |
1960 | ||
1961 | cfg->fc_table = rtm->rtm_table; | |
1962 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
1963 | cfg->fc_src_len = rtm->rtm_src_len; | |
1964 | cfg->fc_flags = RTF_UP; | |
1965 | cfg->fc_protocol = rtm->rtm_protocol; | |
1966 | ||
1967 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
1968 | cfg->fc_flags |= RTF_REJECT; | |
1969 | ||
1970 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
1971 | cfg->fc_nlinfo.nlh = nlh; | |
1972 | ||
1973 | if (tb[RTA_GATEWAY]) { | |
1974 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
1975 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 1976 | } |
86872cb5 TG |
1977 | |
1978 | if (tb[RTA_DST]) { | |
1979 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
1980 | ||
1981 | if (nla_len(tb[RTA_DST]) < plen) | |
1982 | goto errout; | |
1983 | ||
1984 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 1985 | } |
86872cb5 TG |
1986 | |
1987 | if (tb[RTA_SRC]) { | |
1988 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
1989 | ||
1990 | if (nla_len(tb[RTA_SRC]) < plen) | |
1991 | goto errout; | |
1992 | ||
1993 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 1994 | } |
86872cb5 TG |
1995 | |
1996 | if (tb[RTA_OIF]) | |
1997 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
1998 | ||
1999 | if (tb[RTA_PRIORITY]) | |
2000 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2001 | ||
2002 | if (tb[RTA_METRICS]) { | |
2003 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2004 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2005 | } |
86872cb5 TG |
2006 | |
2007 | if (tb[RTA_TABLE]) | |
2008 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2009 | ||
2010 | err = 0; | |
2011 | errout: | |
2012 | return err; | |
1da177e4 LT |
2013 | } |
2014 | ||
2015 | int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
2016 | { | |
86872cb5 TG |
2017 | struct fib6_config cfg; |
2018 | int err; | |
1da177e4 | 2019 | |
86872cb5 TG |
2020 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2021 | if (err < 0) | |
2022 | return err; | |
2023 | ||
2024 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2025 | } |
2026 | ||
2027 | int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
2028 | { | |
86872cb5 TG |
2029 | struct fib6_config cfg; |
2030 | int err; | |
1da177e4 | 2031 | |
86872cb5 TG |
2032 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2033 | if (err < 0) | |
2034 | return err; | |
2035 | ||
2036 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2037 | } |
2038 | ||
339bf98f TG |
2039 | static inline size_t rt6_nlmsg_size(void) |
2040 | { | |
2041 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2042 | + nla_total_size(16) /* RTA_SRC */ | |
2043 | + nla_total_size(16) /* RTA_DST */ | |
2044 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2045 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2046 | + nla_total_size(4) /* RTA_TABLE */ | |
2047 | + nla_total_size(4) /* RTA_IIF */ | |
2048 | + nla_total_size(4) /* RTA_OIF */ | |
2049 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2050 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2051 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2052 | } | |
2053 | ||
1da177e4 | 2054 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2055 | struct in6_addr *dst, struct in6_addr *src, |
2056 | int iif, int type, u32 pid, u32 seq, | |
2057 | int prefix, unsigned int flags) | |
1da177e4 LT |
2058 | { |
2059 | struct rtmsg *rtm; | |
2d7202bf | 2060 | struct nlmsghdr *nlh; |
e3703b3d | 2061 | long expires; |
9e762a4a | 2062 | u32 table; |
1da177e4 LT |
2063 | |
2064 | if (prefix) { /* user wants prefix routes only */ | |
2065 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2066 | /* success since this is not a prefix route */ | |
2067 | return 1; | |
2068 | } | |
2069 | } | |
2070 | ||
2d7202bf TG |
2071 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2072 | if (nlh == NULL) | |
26932566 | 2073 | return -EMSGSIZE; |
2d7202bf TG |
2074 | |
2075 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2076 | rtm->rtm_family = AF_INET6; |
2077 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2078 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2079 | rtm->rtm_tos = 0; | |
c71099ac | 2080 | if (rt->rt6i_table) |
9e762a4a | 2081 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2082 | else |
9e762a4a PM |
2083 | table = RT6_TABLE_UNSPEC; |
2084 | rtm->rtm_table = table; | |
2d7202bf | 2085 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2086 | if (rt->rt6i_flags&RTF_REJECT) |
2087 | rtm->rtm_type = RTN_UNREACHABLE; | |
2088 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2089 | rtm->rtm_type = RTN_LOCAL; | |
2090 | else | |
2091 | rtm->rtm_type = RTN_UNICAST; | |
2092 | rtm->rtm_flags = 0; | |
2093 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2094 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2095 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2096 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2097 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2098 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2099 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2100 | rtm->rtm_protocol = RTPROT_RA; | |
2101 | ||
2102 | if (rt->rt6i_flags&RTF_CACHE) | |
2103 | rtm->rtm_flags |= RTM_F_CLONED; | |
2104 | ||
2105 | if (dst) { | |
2d7202bf | 2106 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2107 | rtm->rtm_dst_len = 128; |
1da177e4 | 2108 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2109 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2110 | #ifdef CONFIG_IPV6_SUBTREES |
2111 | if (src) { | |
2d7202bf | 2112 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2113 | rtm->rtm_src_len = 128; |
1da177e4 | 2114 | } else if (rtm->rtm_src_len) |
2d7202bf | 2115 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2116 | #endif |
2117 | if (iif) | |
2d7202bf | 2118 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2119 | else if (dst) { |
2120 | struct in6_addr saddr_buf; | |
2121 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) | |
2d7202bf | 2122 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2123 | } |
2d7202bf | 2124 | |
1da177e4 | 2125 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2126 | goto nla_put_failure; |
2127 | ||
1da177e4 | 2128 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2129 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2130 | ||
1da177e4 | 2131 | if (rt->u.dst.dev) |
2d7202bf TG |
2132 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2133 | ||
2134 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2135 | |
2136 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2137 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2138 | expires, rt->u.dst.error) < 0) | |
2139 | goto nla_put_failure; | |
2d7202bf TG |
2140 | |
2141 | return nlmsg_end(skb, nlh); | |
2142 | ||
2143 | nla_put_failure: | |
26932566 PM |
2144 | nlmsg_cancel(skb, nlh); |
2145 | return -EMSGSIZE; | |
1da177e4 LT |
2146 | } |
2147 | ||
1b43af54 | 2148 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2149 | { |
2150 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2151 | int prefix; | |
2152 | ||
2d7202bf TG |
2153 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2154 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2155 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2156 | } else | |
2157 | prefix = 0; | |
2158 | ||
2159 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2160 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2161 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2162 | } |
2163 | ||
1da177e4 LT |
2164 | int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
2165 | { | |
ab364a6f TG |
2166 | struct nlattr *tb[RTA_MAX+1]; |
2167 | struct rt6_info *rt; | |
1da177e4 | 2168 | struct sk_buff *skb; |
ab364a6f | 2169 | struct rtmsg *rtm; |
1da177e4 | 2170 | struct flowi fl; |
ab364a6f | 2171 | int err, iif = 0; |
1da177e4 | 2172 | |
ab364a6f TG |
2173 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2174 | if (err < 0) | |
2175 | goto errout; | |
1da177e4 | 2176 | |
ab364a6f | 2177 | err = -EINVAL; |
1da177e4 | 2178 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2179 | |
ab364a6f TG |
2180 | if (tb[RTA_SRC]) { |
2181 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2182 | goto errout; | |
2183 | ||
2184 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2185 | } | |
2186 | ||
2187 | if (tb[RTA_DST]) { | |
2188 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2189 | goto errout; | |
2190 | ||
2191 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2192 | } | |
2193 | ||
2194 | if (tb[RTA_IIF]) | |
2195 | iif = nla_get_u32(tb[RTA_IIF]); | |
2196 | ||
2197 | if (tb[RTA_OIF]) | |
2198 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2199 | |
2200 | if (iif) { | |
2201 | struct net_device *dev; | |
2202 | dev = __dev_get_by_index(iif); | |
2203 | if (!dev) { | |
2204 | err = -ENODEV; | |
ab364a6f | 2205 | goto errout; |
1da177e4 LT |
2206 | } |
2207 | } | |
2208 | ||
ab364a6f TG |
2209 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2210 | if (skb == NULL) { | |
2211 | err = -ENOBUFS; | |
2212 | goto errout; | |
2213 | } | |
1da177e4 | 2214 | |
ab364a6f TG |
2215 | /* Reserve room for dummy headers, this skb can pass |
2216 | through good chunk of routing engine. | |
2217 | */ | |
2218 | skb->mac.raw = skb->data; | |
2219 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); | |
1da177e4 | 2220 | |
ab364a6f | 2221 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2222 | skb->dst = &rt->u.dst; |
2223 | ||
ab364a6f | 2224 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2225 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2226 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2227 | if (err < 0) { |
ab364a6f TG |
2228 | kfree_skb(skb); |
2229 | goto errout; | |
1da177e4 LT |
2230 | } |
2231 | ||
2942e900 | 2232 | err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
ab364a6f | 2233 | errout: |
1da177e4 | 2234 | return err; |
1da177e4 LT |
2235 | } |
2236 | ||
86872cb5 | 2237 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2238 | { |
2239 | struct sk_buff *skb; | |
86872cb5 TG |
2240 | u32 pid = 0, seq = 0; |
2241 | struct nlmsghdr *nlh = NULL; | |
21713ebc TG |
2242 | int err = -ENOBUFS; |
2243 | ||
86872cb5 TG |
2244 | if (info) { |
2245 | pid = info->pid; | |
2246 | nlh = info->nlh; | |
2247 | if (nlh) | |
2248 | seq = nlh->nlmsg_seq; | |
2249 | } | |
2250 | ||
339bf98f | 2251 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2252 | if (skb == NULL) |
2253 | goto errout; | |
2254 | ||
2255 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0); | |
26932566 PM |
2256 | if (err < 0) { |
2257 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2258 | WARN_ON(err == -EMSGSIZE); | |
2259 | kfree_skb(skb); | |
2260 | goto errout; | |
2261 | } | |
21713ebc TG |
2262 | err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any()); |
2263 | errout: | |
2264 | if (err < 0) | |
2265 | rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err); | |
1da177e4 LT |
2266 | } |
2267 | ||
2268 | /* | |
2269 | * /proc | |
2270 | */ | |
2271 | ||
2272 | #ifdef CONFIG_PROC_FS | |
2273 | ||
2274 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2275 | ||
2276 | struct rt6_proc_arg | |
2277 | { | |
2278 | char *buffer; | |
2279 | int offset; | |
2280 | int length; | |
2281 | int skip; | |
2282 | int len; | |
2283 | }; | |
2284 | ||
2285 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2286 | { | |
2287 | struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg; | |
1da177e4 LT |
2288 | |
2289 | if (arg->skip < arg->offset / RT6_INFO_LEN) { | |
2290 | arg->skip++; | |
2291 | return 0; | |
2292 | } | |
2293 | ||
2294 | if (arg->len >= arg->length) | |
2295 | return 0; | |
2296 | ||
33e93c96 YH |
2297 | arg->len += sprintf(arg->buffer + arg->len, |
2298 | NIP6_SEQFMT " %02x ", | |
2299 | NIP6(rt->rt6i_dst.addr), | |
1da177e4 LT |
2300 | rt->rt6i_dst.plen); |
2301 | ||
2302 | #ifdef CONFIG_IPV6_SUBTREES | |
33e93c96 YH |
2303 | arg->len += sprintf(arg->buffer + arg->len, |
2304 | NIP6_SEQFMT " %02x ", | |
2305 | NIP6(rt->rt6i_src.addr), | |
1da177e4 LT |
2306 | rt->rt6i_src.plen); |
2307 | #else | |
33e93c96 YH |
2308 | arg->len += sprintf(arg->buffer + arg->len, |
2309 | "00000000000000000000000000000000 00 "); | |
1da177e4 LT |
2310 | #endif |
2311 | ||
2312 | if (rt->rt6i_nexthop) { | |
33e93c96 YH |
2313 | arg->len += sprintf(arg->buffer + arg->len, |
2314 | NIP6_SEQFMT, | |
2315 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2316 | } else { |
33e93c96 YH |
2317 | arg->len += sprintf(arg->buffer + arg->len, |
2318 | "00000000000000000000000000000000"); | |
1da177e4 LT |
2319 | } |
2320 | arg->len += sprintf(arg->buffer + arg->len, | |
2321 | " %08x %08x %08x %08x %8s\n", | |
2322 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
1ab1457c | 2323 | rt->u.dst.__use, rt->rt6i_flags, |
1da177e4 LT |
2324 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); |
2325 | return 0; | |
2326 | } | |
2327 | ||
2328 | static int rt6_proc_info(char *buffer, char **start, off_t offset, int length) | |
2329 | { | |
c71099ac TG |
2330 | struct rt6_proc_arg arg = { |
2331 | .buffer = buffer, | |
2332 | .offset = offset, | |
2333 | .length = length, | |
2334 | }; | |
1da177e4 | 2335 | |
c71099ac | 2336 | fib6_clean_all(rt6_info_route, 0, &arg); |
1da177e4 LT |
2337 | |
2338 | *start = buffer; | |
2339 | if (offset) | |
2340 | *start += offset % RT6_INFO_LEN; | |
2341 | ||
2342 | arg.len -= offset % RT6_INFO_LEN; | |
2343 | ||
2344 | if (arg.len > length) | |
2345 | arg.len = length; | |
2346 | if (arg.len < 0) | |
2347 | arg.len = 0; | |
2348 | ||
2349 | return arg.len; | |
2350 | } | |
2351 | ||
1da177e4 LT |
2352 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2353 | { | |
2354 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
2355 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
2356 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
2357 | rt6_stats.fib_rt_cache, | |
2358 | atomic_read(&ip6_dst_ops.entries), | |
2359 | rt6_stats.fib_discarded_routes); | |
2360 | ||
2361 | return 0; | |
2362 | } | |
2363 | ||
2364 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2365 | { | |
2366 | return single_open(file, rt6_stats_seq_show, NULL); | |
2367 | } | |
2368 | ||
9a32144e | 2369 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2370 | .owner = THIS_MODULE, |
2371 | .open = rt6_stats_seq_open, | |
2372 | .read = seq_read, | |
2373 | .llseek = seq_lseek, | |
2374 | .release = single_release, | |
2375 | }; | |
2376 | #endif /* CONFIG_PROC_FS */ | |
2377 | ||
2378 | #ifdef CONFIG_SYSCTL | |
2379 | ||
2380 | static int flush_delay; | |
2381 | ||
2382 | static | |
2383 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2384 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2385 | { | |
2386 | if (write) { | |
2387 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2388 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); | |
2389 | return 0; | |
2390 | } else | |
2391 | return -EINVAL; | |
2392 | } | |
2393 | ||
2394 | ctl_table ipv6_route_table[] = { | |
1ab1457c YH |
2395 | { |
2396 | .ctl_name = NET_IPV6_ROUTE_FLUSH, | |
1da177e4 | 2397 | .procname = "flush", |
1ab1457c | 2398 | .data = &flush_delay, |
1da177e4 | 2399 | .maxlen = sizeof(int), |
89c8b3a1 | 2400 | .mode = 0200, |
1ab1457c | 2401 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2402 | }, |
2403 | { | |
2404 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2405 | .procname = "gc_thresh", | |
1ab1457c | 2406 | .data = &ip6_dst_ops.gc_thresh, |
1da177e4 LT |
2407 | .maxlen = sizeof(int), |
2408 | .mode = 0644, | |
1ab1457c | 2409 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2410 | }, |
2411 | { | |
2412 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2413 | .procname = "max_size", | |
1ab1457c | 2414 | .data = &ip6_rt_max_size, |
1da177e4 LT |
2415 | .maxlen = sizeof(int), |
2416 | .mode = 0644, | |
1ab1457c | 2417 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2418 | }, |
2419 | { | |
2420 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2421 | .procname = "gc_min_interval", | |
1ab1457c | 2422 | .data = &ip6_rt_gc_min_interval, |
1da177e4 LT |
2423 | .maxlen = sizeof(int), |
2424 | .mode = 0644, | |
1ab1457c | 2425 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2426 | .strategy = &sysctl_jiffies, |
2427 | }, | |
2428 | { | |
2429 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2430 | .procname = "gc_timeout", | |
1ab1457c | 2431 | .data = &ip6_rt_gc_timeout, |
1da177e4 LT |
2432 | .maxlen = sizeof(int), |
2433 | .mode = 0644, | |
1ab1457c | 2434 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2435 | .strategy = &sysctl_jiffies, |
2436 | }, | |
2437 | { | |
2438 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2439 | .procname = "gc_interval", | |
1ab1457c | 2440 | .data = &ip6_rt_gc_interval, |
1da177e4 LT |
2441 | .maxlen = sizeof(int), |
2442 | .mode = 0644, | |
1ab1457c | 2443 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2444 | .strategy = &sysctl_jiffies, |
2445 | }, | |
2446 | { | |
2447 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2448 | .procname = "gc_elasticity", | |
1ab1457c | 2449 | .data = &ip6_rt_gc_elasticity, |
1da177e4 LT |
2450 | .maxlen = sizeof(int), |
2451 | .mode = 0644, | |
1ab1457c | 2452 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2453 | .strategy = &sysctl_jiffies, |
2454 | }, | |
2455 | { | |
2456 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2457 | .procname = "mtu_expires", | |
1ab1457c | 2458 | .data = &ip6_rt_mtu_expires, |
1da177e4 LT |
2459 | .maxlen = sizeof(int), |
2460 | .mode = 0644, | |
1ab1457c | 2461 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2462 | .strategy = &sysctl_jiffies, |
2463 | }, | |
2464 | { | |
2465 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2466 | .procname = "min_adv_mss", | |
1ab1457c | 2467 | .data = &ip6_rt_min_advmss, |
1da177e4 LT |
2468 | .maxlen = sizeof(int), |
2469 | .mode = 0644, | |
1ab1457c | 2470 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2471 | .strategy = &sysctl_jiffies, |
2472 | }, | |
2473 | { | |
2474 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2475 | .procname = "gc_min_interval_ms", | |
1ab1457c | 2476 | .data = &ip6_rt_gc_min_interval, |
1da177e4 LT |
2477 | .maxlen = sizeof(int), |
2478 | .mode = 0644, | |
1ab1457c | 2479 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2480 | .strategy = &sysctl_ms_jiffies, |
2481 | }, | |
2482 | { .ctl_name = 0 } | |
2483 | }; | |
2484 | ||
2485 | #endif | |
2486 | ||
2487 | void __init ip6_route_init(void) | |
2488 | { | |
2489 | struct proc_dir_entry *p; | |
2490 | ||
e5d679f3 AD |
2491 | ip6_dst_ops.kmem_cachep = |
2492 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
2493 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL); | |
1da177e4 LT |
2494 | fib6_init(); |
2495 | #ifdef CONFIG_PROC_FS | |
2496 | p = proc_net_create("ipv6_route", 0, rt6_proc_info); | |
2497 | if (p) | |
2498 | p->owner = THIS_MODULE; | |
2499 | ||
2500 | proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2501 | #endif | |
2502 | #ifdef CONFIG_XFRM | |
2503 | xfrm6_init(); | |
2504 | #endif | |
101367c2 TG |
2505 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2506 | fib6_rules_init(); | |
2507 | #endif | |
1da177e4 LT |
2508 | } |
2509 | ||
2510 | void ip6_route_cleanup(void) | |
2511 | { | |
101367c2 TG |
2512 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2513 | fib6_rules_cleanup(); | |
2514 | #endif | |
1da177e4 LT |
2515 | #ifdef CONFIG_PROC_FS |
2516 | proc_net_remove("ipv6_route"); | |
2517 | proc_net_remove("rt6_stats"); | |
2518 | #endif | |
2519 | #ifdef CONFIG_XFRM | |
2520 | xfrm6_fini(); | |
2521 | #endif | |
2522 | rt6_ifdown(NULL); | |
2523 | fib6_gc_cleanup(); | |
2524 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2525 | } |