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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; | |
161980f4 | 314 | if (!oif || dev->ifindex == oif) |
554cfb7e | 315 | return 2; |
161980f4 DM |
316 | if ((dev->flags & IFF_LOOPBACK) && |
317 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
318 | return 1; | |
319 | return 0; | |
554cfb7e | 320 | } |
1da177e4 | 321 | |
b6f99a21 | 322 | static inline int 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 | 343 | int m, n; |
1ab1457c | 344 | |
4d0c5911 | 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 | ||
f11e6659 DM |
357 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
358 | int *mpri, struct rt6_info *match) | |
554cfb7e | 359 | { |
f11e6659 DM |
360 | int m; |
361 | ||
362 | if (rt6_check_expired(rt)) | |
363 | goto out; | |
364 | ||
365 | m = rt6_score_route(rt, oif, strict); | |
366 | if (m < 0) | |
367 | goto out; | |
368 | ||
369 | if (m > *mpri) { | |
370 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
371 | rt6_probe(match); | |
372 | *mpri = m; | |
373 | match = rt; | |
374 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
375 | rt6_probe(rt); | |
376 | } | |
377 | ||
378 | out: | |
379 | return match; | |
380 | } | |
381 | ||
382 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
383 | struct rt6_info *rr_head, | |
384 | u32 metric, int oif, int strict) | |
385 | { | |
386 | struct rt6_info *rt, *match; | |
554cfb7e | 387 | int mpri = -1; |
1da177e4 | 388 | |
f11e6659 DM |
389 | match = NULL; |
390 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
391 | rt = rt->u.dst.rt6_next) | |
392 | match = find_match(rt, oif, strict, &mpri, match); | |
393 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
394 | rt = rt->u.dst.rt6_next) | |
395 | match = find_match(rt, oif, strict, &mpri, match); | |
1da177e4 | 396 | |
f11e6659 DM |
397 | return match; |
398 | } | |
1da177e4 | 399 | |
f11e6659 DM |
400 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
401 | { | |
402 | struct rt6_info *match, *rt0; | |
1da177e4 | 403 | |
f11e6659 DM |
404 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
405 | __FUNCTION__, fn->leaf, oif); | |
554cfb7e | 406 | |
f11e6659 DM |
407 | rt0 = fn->rr_ptr; |
408 | if (!rt0) | |
409 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 410 | |
f11e6659 | 411 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 412 | |
554cfb7e | 413 | if (!match && |
f11e6659 DM |
414 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
415 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
416 | ||
554cfb7e | 417 | /* no entries matched; do round-robin */ |
f11e6659 DM |
418 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
419 | next = fn->leaf; | |
420 | ||
421 | if (next != rt0) | |
422 | fn->rr_ptr = next; | |
1da177e4 | 423 | } |
1da177e4 | 424 | |
f11e6659 DM |
425 | RT6_TRACE("%s() => %p\n", |
426 | __FUNCTION__, match); | |
1da177e4 | 427 | |
554cfb7e | 428 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
429 | } |
430 | ||
70ceb4f5 YH |
431 | #ifdef CONFIG_IPV6_ROUTE_INFO |
432 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
433 | struct in6_addr *gwaddr) | |
434 | { | |
435 | struct route_info *rinfo = (struct route_info *) opt; | |
436 | struct in6_addr prefix_buf, *prefix; | |
437 | unsigned int pref; | |
438 | u32 lifetime; | |
439 | struct rt6_info *rt; | |
440 | ||
441 | if (len < sizeof(struct route_info)) { | |
442 | return -EINVAL; | |
443 | } | |
444 | ||
445 | /* Sanity check for prefix_len and length */ | |
446 | if (rinfo->length > 3) { | |
447 | return -EINVAL; | |
448 | } else if (rinfo->prefix_len > 128) { | |
449 | return -EINVAL; | |
450 | } else if (rinfo->prefix_len > 64) { | |
451 | if (rinfo->length < 2) { | |
452 | return -EINVAL; | |
453 | } | |
454 | } else if (rinfo->prefix_len > 0) { | |
455 | if (rinfo->length < 1) { | |
456 | return -EINVAL; | |
457 | } | |
458 | } | |
459 | ||
460 | pref = rinfo->route_pref; | |
461 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
462 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
463 | ||
e69a4adc | 464 | lifetime = ntohl(rinfo->lifetime); |
70ceb4f5 YH |
465 | if (lifetime == 0xffffffff) { |
466 | /* infinity */ | |
467 | } else if (lifetime > 0x7fffffff/HZ) { | |
468 | /* Avoid arithmetic overflow */ | |
469 | lifetime = 0x7fffffff/HZ - 1; | |
470 | } | |
471 | ||
472 | if (rinfo->length == 3) | |
473 | prefix = (struct in6_addr *)rinfo->prefix; | |
474 | else { | |
475 | /* this function is safe */ | |
476 | ipv6_addr_prefix(&prefix_buf, | |
477 | (struct in6_addr *)rinfo->prefix, | |
478 | rinfo->prefix_len); | |
479 | prefix = &prefix_buf; | |
480 | } | |
481 | ||
482 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
483 | ||
484 | if (rt && !lifetime) { | |
e0a1ad73 | 485 | ip6_del_rt(rt); |
70ceb4f5 YH |
486 | rt = NULL; |
487 | } | |
488 | ||
489 | if (!rt && lifetime) | |
490 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
491 | pref); | |
492 | else if (rt) | |
493 | rt->rt6i_flags = RTF_ROUTEINFO | | |
494 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
495 | ||
496 | if (rt) { | |
497 | if (lifetime == 0xffffffff) { | |
498 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
499 | } else { | |
500 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
501 | rt->rt6i_flags |= RTF_EXPIRES; | |
502 | } | |
503 | dst_release(&rt->u.dst); | |
504 | } | |
505 | return 0; | |
506 | } | |
507 | #endif | |
508 | ||
982f56f3 YH |
509 | #define BACKTRACK(saddr) \ |
510 | do { \ | |
511 | if (rt == &ip6_null_entry) { \ | |
512 | struct fib6_node *pn; \ | |
e0eda7bb | 513 | while (1) { \ |
982f56f3 YH |
514 | if (fn->fn_flags & RTN_TL_ROOT) \ |
515 | goto out; \ | |
516 | pn = fn->parent; \ | |
517 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 518 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
519 | else \ |
520 | fn = pn; \ | |
521 | if (fn->fn_flags & RTN_RTINFO) \ | |
522 | goto restart; \ | |
c71099ac | 523 | } \ |
c71099ac | 524 | } \ |
982f56f3 | 525 | } while(0) |
c71099ac TG |
526 | |
527 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
528 | struct flowi *fl, int flags) | |
1da177e4 LT |
529 | { |
530 | struct fib6_node *fn; | |
531 | struct rt6_info *rt; | |
532 | ||
c71099ac TG |
533 | read_lock_bh(&table->tb6_lock); |
534 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
535 | restart: | |
536 | rt = fn->leaf; | |
77d16f45 | 537 | rt = rt6_device_match(rt, fl->oif, flags); |
982f56f3 | 538 | BACKTRACK(&fl->fl6_src); |
c71099ac | 539 | out: |
33cc4896 | 540 | dst_hold(&rt->u.dst); |
c71099ac | 541 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
542 | |
543 | rt->u.dst.lastuse = jiffies; | |
c71099ac TG |
544 | rt->u.dst.__use++; |
545 | ||
546 | return rt; | |
547 | ||
548 | } | |
549 | ||
550 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, | |
551 | int oif, int strict) | |
552 | { | |
553 | struct flowi fl = { | |
554 | .oif = oif, | |
555 | .nl_u = { | |
556 | .ip6_u = { | |
557 | .daddr = *daddr, | |
c71099ac TG |
558 | }, |
559 | }, | |
560 | }; | |
561 | struct dst_entry *dst; | |
77d16f45 | 562 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 563 | |
adaa70bb TG |
564 | if (saddr) { |
565 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
566 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
567 | } | |
568 | ||
c71099ac TG |
569 | dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup); |
570 | if (dst->error == 0) | |
571 | return (struct rt6_info *) dst; | |
572 | ||
573 | dst_release(dst); | |
574 | ||
1da177e4 LT |
575 | return NULL; |
576 | } | |
577 | ||
7159039a YH |
578 | EXPORT_SYMBOL(rt6_lookup); |
579 | ||
c71099ac | 580 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
581 | It takes new route entry, the addition fails by any reason the |
582 | route is freed. In any case, if caller does not hold it, it may | |
583 | be destroyed. | |
584 | */ | |
585 | ||
86872cb5 | 586 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
587 | { |
588 | int err; | |
c71099ac | 589 | struct fib6_table *table; |
1da177e4 | 590 | |
c71099ac TG |
591 | table = rt->rt6i_table; |
592 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 593 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 594 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
595 | |
596 | return err; | |
597 | } | |
598 | ||
40e22e8f TG |
599 | int ip6_ins_rt(struct rt6_info *rt) |
600 | { | |
86872cb5 | 601 | return __ip6_ins_rt(rt, NULL); |
40e22e8f TG |
602 | } |
603 | ||
95a9a5ba YH |
604 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
605 | struct in6_addr *saddr) | |
1da177e4 | 606 | { |
1da177e4 LT |
607 | struct rt6_info *rt; |
608 | ||
609 | /* | |
610 | * Clone the route. | |
611 | */ | |
612 | ||
613 | rt = ip6_rt_copy(ort); | |
614 | ||
615 | if (rt) { | |
58c4fb86 YH |
616 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
617 | if (rt->rt6i_dst.plen != 128 && | |
618 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
619 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 620 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 621 | } |
1da177e4 | 622 | |
58c4fb86 | 623 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
624 | rt->rt6i_dst.plen = 128; |
625 | rt->rt6i_flags |= RTF_CACHE; | |
626 | rt->u.dst.flags |= DST_HOST; | |
627 | ||
628 | #ifdef CONFIG_IPV6_SUBTREES | |
629 | if (rt->rt6i_src.plen && saddr) { | |
630 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
631 | rt->rt6i_src.plen = 128; | |
632 | } | |
633 | #endif | |
634 | ||
635 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
636 | ||
95a9a5ba | 637 | } |
1da177e4 | 638 | |
95a9a5ba YH |
639 | return rt; |
640 | } | |
1da177e4 | 641 | |
299d9939 YH |
642 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
643 | { | |
644 | struct rt6_info *rt = ip6_rt_copy(ort); | |
645 | if (rt) { | |
646 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
647 | rt->rt6i_dst.plen = 128; | |
648 | rt->rt6i_flags |= RTF_CACHE; | |
299d9939 YH |
649 | rt->u.dst.flags |= DST_HOST; |
650 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
651 | } | |
652 | return rt; | |
653 | } | |
654 | ||
8ce11e6a AB |
655 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, |
656 | struct flowi *fl, int flags) | |
1da177e4 LT |
657 | { |
658 | struct fib6_node *fn; | |
519fbd87 | 659 | struct rt6_info *rt, *nrt; |
c71099ac | 660 | int strict = 0; |
1da177e4 | 661 | int attempts = 3; |
519fbd87 | 662 | int err; |
ea659e07 | 663 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 664 | |
77d16f45 | 665 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
666 | |
667 | relookup: | |
c71099ac | 668 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 669 | |
8238dd06 | 670 | restart_2: |
c71099ac | 671 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
672 | |
673 | restart: | |
f11e6659 | 674 | rt = rt6_select(fn, fl->iif, strict | reachable); |
982f56f3 | 675 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
676 | if (rt == &ip6_null_entry || |
677 | rt->rt6i_flags & RTF_CACHE) | |
1ddef044 | 678 | goto out; |
1da177e4 | 679 | |
fb9de91e | 680 | dst_hold(&rt->u.dst); |
c71099ac | 681 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 682 | |
519fbd87 | 683 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 684 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
685 | else { |
686 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 687 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
688 | #else |
689 | goto out2; | |
690 | #endif | |
691 | } | |
e40cf353 | 692 | |
519fbd87 YH |
693 | dst_release(&rt->u.dst); |
694 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 695 | |
519fbd87 YH |
696 | dst_hold(&rt->u.dst); |
697 | if (nrt) { | |
40e22e8f | 698 | err = ip6_ins_rt(nrt); |
519fbd87 | 699 | if (!err) |
1da177e4 | 700 | goto out2; |
1da177e4 | 701 | } |
1da177e4 | 702 | |
519fbd87 YH |
703 | if (--attempts <= 0) |
704 | goto out2; | |
705 | ||
706 | /* | |
c71099ac | 707 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
708 | * released someone could insert this route. Relookup. |
709 | */ | |
710 | dst_release(&rt->u.dst); | |
711 | goto relookup; | |
712 | ||
713 | out: | |
8238dd06 YH |
714 | if (reachable) { |
715 | reachable = 0; | |
716 | goto restart_2; | |
717 | } | |
519fbd87 | 718 | dst_hold(&rt->u.dst); |
c71099ac | 719 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
720 | out2: |
721 | rt->u.dst.lastuse = jiffies; | |
722 | rt->u.dst.__use++; | |
c71099ac TG |
723 | |
724 | return rt; | |
1da177e4 LT |
725 | } |
726 | ||
c71099ac TG |
727 | void ip6_route_input(struct sk_buff *skb) |
728 | { | |
0660e03f | 729 | struct ipv6hdr *iph = ipv6_hdr(skb); |
adaa70bb | 730 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
731 | struct flowi fl = { |
732 | .iif = skb->dev->ifindex, | |
733 | .nl_u = { | |
734 | .ip6_u = { | |
735 | .daddr = iph->daddr, | |
736 | .saddr = iph->saddr, | |
90bcaf7b | 737 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, |
c71099ac TG |
738 | }, |
739 | }, | |
1ab1457c | 740 | .mark = skb->mark, |
c71099ac TG |
741 | .proto = iph->nexthdr, |
742 | }; | |
adaa70bb TG |
743 | |
744 | if (rt6_need_strict(&iph->daddr)) | |
745 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac TG |
746 | |
747 | skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input); | |
748 | } | |
749 | ||
750 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
751 | struct flowi *fl, int flags) | |
1da177e4 LT |
752 | { |
753 | struct fib6_node *fn; | |
519fbd87 | 754 | struct rt6_info *rt, *nrt; |
c71099ac | 755 | int strict = 0; |
1da177e4 | 756 | int attempts = 3; |
519fbd87 | 757 | int err; |
ea659e07 | 758 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 759 | |
77d16f45 | 760 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
761 | |
762 | relookup: | |
c71099ac | 763 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 764 | |
8238dd06 | 765 | restart_2: |
c71099ac | 766 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
767 | |
768 | restart: | |
f11e6659 | 769 | rt = rt6_select(fn, fl->oif, strict | reachable); |
982f56f3 | 770 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
771 | if (rt == &ip6_null_entry || |
772 | rt->rt6i_flags & RTF_CACHE) | |
1da177e4 | 773 | goto out; |
1da177e4 | 774 | |
fb9de91e | 775 | dst_hold(&rt->u.dst); |
c71099ac | 776 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 777 | |
519fbd87 | 778 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
e40cf353 | 779 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
780 | else { |
781 | #if CLONE_OFFLINK_ROUTE | |
782 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); | |
783 | #else | |
784 | goto out2; | |
785 | #endif | |
786 | } | |
1da177e4 | 787 | |
519fbd87 YH |
788 | dst_release(&rt->u.dst); |
789 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 790 | |
519fbd87 YH |
791 | dst_hold(&rt->u.dst); |
792 | if (nrt) { | |
40e22e8f | 793 | err = ip6_ins_rt(nrt); |
519fbd87 | 794 | if (!err) |
1da177e4 | 795 | goto out2; |
1da177e4 | 796 | } |
e40cf353 | 797 | |
519fbd87 YH |
798 | if (--attempts <= 0) |
799 | goto out2; | |
800 | ||
801 | /* | |
c71099ac | 802 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
803 | * released someone could insert this route. Relookup. |
804 | */ | |
805 | dst_release(&rt->u.dst); | |
806 | goto relookup; | |
807 | ||
808 | out: | |
8238dd06 YH |
809 | if (reachable) { |
810 | reachable = 0; | |
811 | goto restart_2; | |
812 | } | |
519fbd87 | 813 | dst_hold(&rt->u.dst); |
c71099ac | 814 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
815 | out2: |
816 | rt->u.dst.lastuse = jiffies; | |
817 | rt->u.dst.__use++; | |
c71099ac TG |
818 | return rt; |
819 | } | |
820 | ||
821 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
822 | { | |
823 | int flags = 0; | |
824 | ||
825 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 826 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 827 | |
adaa70bb TG |
828 | if (!ipv6_addr_any(&fl->fl6_src)) |
829 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
830 | ||
c71099ac | 831 | return fib6_rule_lookup(fl, flags, ip6_pol_route_output); |
1da177e4 LT |
832 | } |
833 | ||
7159039a | 834 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 LT |
835 | |
836 | /* | |
837 | * Destination cache support functions | |
838 | */ | |
839 | ||
840 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
841 | { | |
842 | struct rt6_info *rt; | |
843 | ||
844 | rt = (struct rt6_info *) dst; | |
845 | ||
846 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
847 | return dst; | |
848 | ||
849 | return NULL; | |
850 | } | |
851 | ||
852 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
853 | { | |
854 | struct rt6_info *rt = (struct rt6_info *) dst; | |
855 | ||
856 | if (rt) { | |
857 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 858 | ip6_del_rt(rt); |
1da177e4 LT |
859 | else |
860 | dst_release(dst); | |
861 | } | |
862 | return NULL; | |
863 | } | |
864 | ||
865 | static void ip6_link_failure(struct sk_buff *skb) | |
866 | { | |
867 | struct rt6_info *rt; | |
868 | ||
869 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
870 | ||
871 | rt = (struct rt6_info *) skb->dst; | |
872 | if (rt) { | |
873 | if (rt->rt6i_flags&RTF_CACHE) { | |
874 | dst_set_expires(&rt->u.dst, 0); | |
875 | rt->rt6i_flags |= RTF_EXPIRES; | |
876 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
877 | rt->rt6i_node->fn_sernum = -1; | |
878 | } | |
879 | } | |
880 | ||
881 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
882 | { | |
883 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
884 | ||
885 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
886 | rt6->rt6i_flags |= RTF_MODIFIED; | |
887 | if (mtu < IPV6_MIN_MTU) { | |
888 | mtu = IPV6_MIN_MTU; | |
889 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
890 | } | |
891 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 892 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
893 | } |
894 | } | |
895 | ||
1da177e4 LT |
896 | static int ipv6_get_mtu(struct net_device *dev); |
897 | ||
898 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
899 | { | |
900 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
901 | ||
902 | if (mtu < ip6_rt_min_advmss) | |
903 | mtu = ip6_rt_min_advmss; | |
904 | ||
905 | /* | |
1ab1457c YH |
906 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
907 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
908 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
909 | * rely only on pmtu discovery" |
910 | */ | |
911 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
912 | mtu = IPV6_MAXPLEN; | |
913 | return mtu; | |
914 | } | |
915 | ||
5d0bbeeb | 916 | static struct dst_entry *ndisc_dst_gc_list; |
8ce11e6a | 917 | static DEFINE_SPINLOCK(ndisc_lock); |
5d0bbeeb | 918 | |
1ab1457c | 919 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, |
1da177e4 LT |
920 | struct neighbour *neigh, |
921 | struct in6_addr *addr, | |
922 | int (*output)(struct sk_buff *)) | |
923 | { | |
924 | struct rt6_info *rt; | |
925 | struct inet6_dev *idev = in6_dev_get(dev); | |
926 | ||
927 | if (unlikely(idev == NULL)) | |
928 | return NULL; | |
929 | ||
930 | rt = ip6_dst_alloc(); | |
931 | if (unlikely(rt == NULL)) { | |
932 | in6_dev_put(idev); | |
933 | goto out; | |
934 | } | |
935 | ||
936 | dev_hold(dev); | |
937 | if (neigh) | |
938 | neigh_hold(neigh); | |
939 | else | |
940 | neigh = ndisc_get_neigh(dev, addr); | |
941 | ||
942 | rt->rt6i_dev = dev; | |
943 | rt->rt6i_idev = idev; | |
944 | rt->rt6i_nexthop = neigh; | |
945 | atomic_set(&rt->u.dst.__refcnt, 1); | |
946 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
947 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
948 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
949 | rt->u.dst.output = output; | |
950 | ||
951 | #if 0 /* there's no chance to use these for ndisc */ | |
1ab1457c YH |
952 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
953 | ? DST_HOST | |
1da177e4 LT |
954 | : 0; |
955 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
956 | rt->rt6i_dst.plen = 128; | |
957 | #endif | |
958 | ||
5d0bbeeb | 959 | spin_lock_bh(&ndisc_lock); |
1da177e4 LT |
960 | rt->u.dst.next = ndisc_dst_gc_list; |
961 | ndisc_dst_gc_list = &rt->u.dst; | |
5d0bbeeb | 962 | spin_unlock_bh(&ndisc_lock); |
1da177e4 LT |
963 | |
964 | fib6_force_start_gc(); | |
965 | ||
966 | out: | |
40aa7b90 | 967 | return &rt->u.dst; |
1da177e4 LT |
968 | } |
969 | ||
970 | int ndisc_dst_gc(int *more) | |
971 | { | |
972 | struct dst_entry *dst, *next, **pprev; | |
973 | int freed; | |
974 | ||
975 | next = NULL; | |
1ab1457c | 976 | freed = 0; |
5d0bbeeb TG |
977 | |
978 | spin_lock_bh(&ndisc_lock); | |
1da177e4 | 979 | pprev = &ndisc_dst_gc_list; |
5d0bbeeb | 980 | |
1da177e4 LT |
981 | while ((dst = *pprev) != NULL) { |
982 | if (!atomic_read(&dst->__refcnt)) { | |
983 | *pprev = dst->next; | |
984 | dst_free(dst); | |
985 | freed++; | |
986 | } else { | |
987 | pprev = &dst->next; | |
988 | (*more)++; | |
989 | } | |
990 | } | |
991 | ||
5d0bbeeb TG |
992 | spin_unlock_bh(&ndisc_lock); |
993 | ||
1da177e4 LT |
994 | return freed; |
995 | } | |
996 | ||
997 | static int ip6_dst_gc(void) | |
998 | { | |
999 | static unsigned expire = 30*HZ; | |
1000 | static unsigned long last_gc; | |
1001 | unsigned long now = jiffies; | |
1002 | ||
1003 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && | |
1004 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) | |
1005 | goto out; | |
1006 | ||
1007 | expire++; | |
1008 | fib6_run_gc(expire); | |
1009 | last_gc = now; | |
1010 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
1011 | expire = ip6_rt_gc_timeout>>1; | |
1012 | ||
1013 | out: | |
1014 | expire -= expire>>ip6_rt_gc_elasticity; | |
1015 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); | |
1016 | } | |
1017 | ||
1018 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1019 | but results in cleaner routing tables. | |
1020 | ||
1021 | Remove it only when all the things will work! | |
1022 | */ | |
1023 | ||
1024 | static int ipv6_get_mtu(struct net_device *dev) | |
1025 | { | |
1026 | int mtu = IPV6_MIN_MTU; | |
1027 | struct inet6_dev *idev; | |
1028 | ||
1029 | idev = in6_dev_get(dev); | |
1030 | if (idev) { | |
1031 | mtu = idev->cnf.mtu6; | |
1032 | in6_dev_put(idev); | |
1033 | } | |
1034 | return mtu; | |
1035 | } | |
1036 | ||
1037 | int ipv6_get_hoplimit(struct net_device *dev) | |
1038 | { | |
1039 | int hoplimit = ipv6_devconf.hop_limit; | |
1040 | struct inet6_dev *idev; | |
1041 | ||
1042 | idev = in6_dev_get(dev); | |
1043 | if (idev) { | |
1044 | hoplimit = idev->cnf.hop_limit; | |
1045 | in6_dev_put(idev); | |
1046 | } | |
1047 | return hoplimit; | |
1048 | } | |
1049 | ||
1050 | /* | |
1051 | * | |
1052 | */ | |
1053 | ||
86872cb5 | 1054 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1055 | { |
1056 | int err; | |
1da177e4 LT |
1057 | struct rt6_info *rt = NULL; |
1058 | struct net_device *dev = NULL; | |
1059 | struct inet6_dev *idev = NULL; | |
c71099ac | 1060 | struct fib6_table *table; |
1da177e4 LT |
1061 | int addr_type; |
1062 | ||
86872cb5 | 1063 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1064 | return -EINVAL; |
1065 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1066 | if (cfg->fc_src_len) |
1da177e4 LT |
1067 | return -EINVAL; |
1068 | #endif | |
86872cb5 | 1069 | if (cfg->fc_ifindex) { |
1da177e4 | 1070 | err = -ENODEV; |
86872cb5 | 1071 | dev = dev_get_by_index(cfg->fc_ifindex); |
1da177e4 LT |
1072 | if (!dev) |
1073 | goto out; | |
1074 | idev = in6_dev_get(dev); | |
1075 | if (!idev) | |
1076 | goto out; | |
1077 | } | |
1078 | ||
86872cb5 TG |
1079 | if (cfg->fc_metric == 0) |
1080 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1081 | |
86872cb5 | 1082 | table = fib6_new_table(cfg->fc_table); |
c71099ac TG |
1083 | if (table == NULL) { |
1084 | err = -ENOBUFS; | |
1085 | goto out; | |
1086 | } | |
1087 | ||
1da177e4 LT |
1088 | rt = ip6_dst_alloc(); |
1089 | ||
1090 | if (rt == NULL) { | |
1091 | err = -ENOMEM; | |
1092 | goto out; | |
1093 | } | |
1094 | ||
1095 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1096 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1097 | |
86872cb5 TG |
1098 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1099 | cfg->fc_protocol = RTPROT_BOOT; | |
1100 | rt->rt6i_protocol = cfg->fc_protocol; | |
1101 | ||
1102 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1103 | |
1104 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1105 | rt->u.dst.input = ip6_mc_input; | |
1106 | else | |
1107 | rt->u.dst.input = ip6_forward; | |
1108 | ||
1109 | rt->u.dst.output = ip6_output; | |
1110 | ||
86872cb5 TG |
1111 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1112 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1113 | if (rt->rt6i_dst.plen == 128) |
1114 | rt->u.dst.flags = DST_HOST; | |
1115 | ||
1116 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1117 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1118 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1119 | #endif |
1120 | ||
86872cb5 | 1121 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1122 | |
1123 | /* We cannot add true routes via loopback here, | |
1124 | they would result in kernel looping; promote them to reject routes | |
1125 | */ | |
86872cb5 | 1126 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1127 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1128 | /* hold loopback dev/idev if we haven't done so. */ | |
1129 | if (dev != &loopback_dev) { | |
1130 | if (dev) { | |
1131 | dev_put(dev); | |
1132 | in6_dev_put(idev); | |
1133 | } | |
1134 | dev = &loopback_dev; | |
1135 | dev_hold(dev); | |
1136 | idev = in6_dev_get(dev); | |
1137 | if (!idev) { | |
1138 | err = -ENODEV; | |
1139 | goto out; | |
1140 | } | |
1141 | } | |
1142 | rt->u.dst.output = ip6_pkt_discard_out; | |
1143 | rt->u.dst.input = ip6_pkt_discard; | |
1144 | rt->u.dst.error = -ENETUNREACH; | |
1145 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1146 | goto install_route; | |
1147 | } | |
1148 | ||
86872cb5 | 1149 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1150 | struct in6_addr *gw_addr; |
1151 | int gwa_type; | |
1152 | ||
86872cb5 TG |
1153 | gw_addr = &cfg->fc_gateway; |
1154 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1155 | gwa_type = ipv6_addr_type(gw_addr); |
1156 | ||
1157 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1158 | struct rt6_info *grt; | |
1159 | ||
1160 | /* IPv6 strictly inhibits using not link-local | |
1161 | addresses as nexthop address. | |
1162 | Otherwise, router will not able to send redirects. | |
1163 | It is very good, but in some (rare!) circumstances | |
1164 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1165 | some exceptions. --ANK | |
1166 | */ | |
1167 | err = -EINVAL; | |
1168 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1169 | goto out; | |
1170 | ||
86872cb5 | 1171 | grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1172 | |
1173 | err = -EHOSTUNREACH; | |
1174 | if (grt == NULL) | |
1175 | goto out; | |
1176 | if (dev) { | |
1177 | if (dev != grt->rt6i_dev) { | |
1178 | dst_release(&grt->u.dst); | |
1179 | goto out; | |
1180 | } | |
1181 | } else { | |
1182 | dev = grt->rt6i_dev; | |
1183 | idev = grt->rt6i_idev; | |
1184 | dev_hold(dev); | |
1185 | in6_dev_hold(grt->rt6i_idev); | |
1186 | } | |
1187 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1188 | err = 0; | |
1189 | dst_release(&grt->u.dst); | |
1190 | ||
1191 | if (err) | |
1192 | goto out; | |
1193 | } | |
1194 | err = -EINVAL; | |
1195 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1196 | goto out; | |
1197 | } | |
1198 | ||
1199 | err = -ENODEV; | |
1200 | if (dev == NULL) | |
1201 | goto out; | |
1202 | ||
86872cb5 | 1203 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1204 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1205 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1206 | err = PTR_ERR(rt->rt6i_nexthop); | |
1207 | rt->rt6i_nexthop = NULL; | |
1208 | goto out; | |
1209 | } | |
1210 | } | |
1211 | ||
86872cb5 | 1212 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1213 | |
1214 | install_route: | |
86872cb5 TG |
1215 | if (cfg->fc_mx) { |
1216 | struct nlattr *nla; | |
1217 | int remaining; | |
1218 | ||
1219 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1220 | int type = nla->nla_type; | |
1221 | ||
1222 | if (type) { | |
1223 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1224 | err = -EINVAL; |
1225 | goto out; | |
1226 | } | |
86872cb5 TG |
1227 | |
1228 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1229 | } |
1da177e4 LT |
1230 | } |
1231 | } | |
1232 | ||
1233 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1234 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1235 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1236 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1237 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1238 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1239 | rt->u.dst.dev = dev; | |
1240 | rt->rt6i_idev = idev; | |
c71099ac | 1241 | rt->rt6i_table = table; |
86872cb5 | 1242 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1243 | |
1244 | out: | |
1245 | if (dev) | |
1246 | dev_put(dev); | |
1247 | if (idev) | |
1248 | in6_dev_put(idev); | |
1249 | if (rt) | |
40aa7b90 | 1250 | dst_free(&rt->u.dst); |
1da177e4 LT |
1251 | return err; |
1252 | } | |
1253 | ||
86872cb5 | 1254 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1255 | { |
1256 | int err; | |
c71099ac | 1257 | struct fib6_table *table; |
1da177e4 | 1258 | |
6c813a72 PM |
1259 | if (rt == &ip6_null_entry) |
1260 | return -ENOENT; | |
1261 | ||
c71099ac TG |
1262 | table = rt->rt6i_table; |
1263 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1264 | |
86872cb5 | 1265 | err = fib6_del(rt, info); |
1da177e4 LT |
1266 | dst_release(&rt->u.dst); |
1267 | ||
c71099ac | 1268 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1269 | |
1270 | return err; | |
1271 | } | |
1272 | ||
e0a1ad73 TG |
1273 | int ip6_del_rt(struct rt6_info *rt) |
1274 | { | |
86872cb5 | 1275 | return __ip6_del_rt(rt, NULL); |
e0a1ad73 TG |
1276 | } |
1277 | ||
86872cb5 | 1278 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1279 | { |
c71099ac | 1280 | struct fib6_table *table; |
1da177e4 LT |
1281 | struct fib6_node *fn; |
1282 | struct rt6_info *rt; | |
1283 | int err = -ESRCH; | |
1284 | ||
86872cb5 | 1285 | table = fib6_get_table(cfg->fc_table); |
c71099ac TG |
1286 | if (table == NULL) |
1287 | return err; | |
1288 | ||
1289 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1290 | |
c71099ac | 1291 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1292 | &cfg->fc_dst, cfg->fc_dst_len, |
1293 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1294 | |
1da177e4 | 1295 | if (fn) { |
7cc48263 | 1296 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
86872cb5 | 1297 | if (cfg->fc_ifindex && |
1da177e4 | 1298 | (rt->rt6i_dev == NULL || |
86872cb5 | 1299 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1300 | continue; |
86872cb5 TG |
1301 | if (cfg->fc_flags & RTF_GATEWAY && |
1302 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1303 | continue; |
86872cb5 | 1304 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1305 | continue; |
1306 | dst_hold(&rt->u.dst); | |
c71099ac | 1307 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1308 | |
86872cb5 | 1309 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1310 | } |
1311 | } | |
c71099ac | 1312 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1313 | |
1314 | return err; | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * Handle redirects | |
1319 | */ | |
a6279458 YH |
1320 | struct ip6rd_flowi { |
1321 | struct flowi fl; | |
1322 | struct in6_addr gateway; | |
1323 | }; | |
1324 | ||
1325 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1326 | struct flowi *fl, | |
1327 | int flags) | |
1da177e4 | 1328 | { |
a6279458 YH |
1329 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1330 | struct rt6_info *rt; | |
e843b9e1 | 1331 | struct fib6_node *fn; |
c71099ac | 1332 | |
1da177e4 | 1333 | /* |
e843b9e1 YH |
1334 | * Get the "current" route for this destination and |
1335 | * check if the redirect has come from approriate router. | |
1336 | * | |
1337 | * RFC 2461 specifies that redirects should only be | |
1338 | * accepted if they come from the nexthop to the target. | |
1339 | * Due to the way the routes are chosen, this notion | |
1340 | * is a bit fuzzy and one might need to check all possible | |
1341 | * routes. | |
1da177e4 | 1342 | */ |
1da177e4 | 1343 | |
c71099ac | 1344 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1345 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1346 | restart: |
7cc48263 | 1347 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
e843b9e1 YH |
1348 | /* |
1349 | * Current route is on-link; redirect is always invalid. | |
1350 | * | |
1351 | * Seems, previous statement is not true. It could | |
1352 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1353 | * But then router serving it might decide, that we should | |
1354 | * know truth 8)8) --ANK (980726). | |
1355 | */ | |
1356 | if (rt6_check_expired(rt)) | |
1357 | continue; | |
1358 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1359 | continue; | |
a6279458 | 1360 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1361 | continue; |
a6279458 | 1362 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1363 | continue; |
1364 | break; | |
1365 | } | |
a6279458 | 1366 | |
cb15d9c2 | 1367 | if (!rt) |
a6279458 | 1368 | rt = &ip6_null_entry; |
cb15d9c2 YH |
1369 | BACKTRACK(&fl->fl6_src); |
1370 | out: | |
a6279458 YH |
1371 | dst_hold(&rt->u.dst); |
1372 | ||
c71099ac | 1373 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1374 | |
a6279458 YH |
1375 | return rt; |
1376 | }; | |
1377 | ||
1378 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1379 | struct in6_addr *src, | |
1380 | struct in6_addr *gateway, | |
1381 | struct net_device *dev) | |
1382 | { | |
adaa70bb | 1383 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
a6279458 YH |
1384 | struct ip6rd_flowi rdfl = { |
1385 | .fl = { | |
1386 | .oif = dev->ifindex, | |
1387 | .nl_u = { | |
1388 | .ip6_u = { | |
1389 | .daddr = *dest, | |
1390 | .saddr = *src, | |
1391 | }, | |
1392 | }, | |
1393 | }, | |
1394 | .gateway = *gateway, | |
1395 | }; | |
adaa70bb TG |
1396 | |
1397 | if (rt6_need_strict(dest)) | |
1398 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 YH |
1399 | |
1400 | return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect); | |
1401 | } | |
1402 | ||
1403 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1404 | struct in6_addr *saddr, | |
1405 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1406 | { | |
1407 | struct rt6_info *rt, *nrt = NULL; | |
1408 | struct netevent_redirect netevent; | |
1409 | ||
1410 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1411 | ||
1412 | if (rt == &ip6_null_entry) { | |
1da177e4 LT |
1413 | if (net_ratelimit()) |
1414 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1415 | "for redirect target\n"); | |
a6279458 | 1416 | goto out; |
1da177e4 LT |
1417 | } |
1418 | ||
1da177e4 LT |
1419 | /* |
1420 | * We have finally decided to accept it. | |
1421 | */ | |
1422 | ||
1ab1457c | 1423 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1424 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1425 | NEIGH_UPDATE_F_OVERRIDE| | |
1426 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1427 | NEIGH_UPDATE_F_ISROUTER)) | |
1428 | ); | |
1429 | ||
1430 | /* | |
1431 | * Redirect received -> path was valid. | |
1432 | * Look, redirects are sent only in response to data packets, | |
1433 | * so that this nexthop apparently is reachable. --ANK | |
1434 | */ | |
1435 | dst_confirm(&rt->u.dst); | |
1436 | ||
1437 | /* Duplicate redirect: silently ignore. */ | |
1438 | if (neigh == rt->u.dst.neighbour) | |
1439 | goto out; | |
1440 | ||
1441 | nrt = ip6_rt_copy(rt); | |
1442 | if (nrt == NULL) | |
1443 | goto out; | |
1444 | ||
1445 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1446 | if (on_link) | |
1447 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1448 | ||
1449 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1450 | nrt->rt6i_dst.plen = 128; | |
1451 | nrt->u.dst.flags |= DST_HOST; | |
1452 | ||
1453 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1454 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1455 | /* Reset pmtu, it may be better */ | |
1456 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1457 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1458 | ||
40e22e8f | 1459 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1460 | goto out; |
1461 | ||
8d71740c TT |
1462 | netevent.old = &rt->u.dst; |
1463 | netevent.new = &nrt->u.dst; | |
1464 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1465 | ||
1da177e4 | 1466 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1467 | ip6_del_rt(rt); |
1da177e4 LT |
1468 | return; |
1469 | } | |
1470 | ||
1471 | out: | |
1ab1457c | 1472 | dst_release(&rt->u.dst); |
1da177e4 LT |
1473 | return; |
1474 | } | |
1475 | ||
1476 | /* | |
1477 | * Handle ICMP "packet too big" messages | |
1478 | * i.e. Path MTU discovery | |
1479 | */ | |
1480 | ||
1481 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1482 | struct net_device *dev, u32 pmtu) | |
1483 | { | |
1484 | struct rt6_info *rt, *nrt; | |
1485 | int allfrag = 0; | |
1486 | ||
1487 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1488 | if (rt == NULL) | |
1489 | return; | |
1490 | ||
1491 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1492 | goto out; | |
1493 | ||
1494 | if (pmtu < IPV6_MIN_MTU) { | |
1495 | /* | |
1ab1457c | 1496 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1497 | * MTU (1280) and a fragment header should always be included |
1498 | * after a node receiving Too Big message reporting PMTU is | |
1499 | * less than the IPv6 Minimum Link MTU. | |
1500 | */ | |
1501 | pmtu = IPV6_MIN_MTU; | |
1502 | allfrag = 1; | |
1503 | } | |
1504 | ||
1505 | /* New mtu received -> path was valid. | |
1506 | They are sent only in response to data packets, | |
1507 | so that this nexthop apparently is reachable. --ANK | |
1508 | */ | |
1509 | dst_confirm(&rt->u.dst); | |
1510 | ||
1511 | /* Host route. If it is static, it would be better | |
1512 | not to override it, but add new one, so that | |
1513 | when cache entry will expire old pmtu | |
1514 | would return automatically. | |
1515 | */ | |
1516 | if (rt->rt6i_flags & RTF_CACHE) { | |
1517 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1518 | if (allfrag) | |
1519 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1520 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); | |
1521 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; | |
1522 | goto out; | |
1523 | } | |
1524 | ||
1525 | /* Network route. | |
1526 | Two cases are possible: | |
1527 | 1. It is connected route. Action: COW | |
1528 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1529 | */ | |
d5315b50 | 1530 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1531 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1532 | else |
1533 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1534 | |
d5315b50 | 1535 | if (nrt) { |
a1e78363 YH |
1536 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1537 | if (allfrag) | |
1538 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1539 | ||
1540 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1541 | * happened within 5 mins, the recommended timer is 10 mins. | |
1542 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1543 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1544 | * and detecting PMTU increase will be automatically happened. | |
1545 | */ | |
1546 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); | |
1547 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; | |
1548 | ||
40e22e8f | 1549 | ip6_ins_rt(nrt); |
1da177e4 | 1550 | } |
1da177e4 LT |
1551 | out: |
1552 | dst_release(&rt->u.dst); | |
1553 | } | |
1554 | ||
1555 | /* | |
1556 | * Misc support functions | |
1557 | */ | |
1558 | ||
1559 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1560 | { | |
1561 | struct rt6_info *rt = ip6_dst_alloc(); | |
1562 | ||
1563 | if (rt) { | |
1564 | rt->u.dst.input = ort->u.dst.input; | |
1565 | rt->u.dst.output = ort->u.dst.output; | |
1566 | ||
1567 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
22e1e4d8 | 1568 | rt->u.dst.error = ort->u.dst.error; |
1da177e4 LT |
1569 | rt->u.dst.dev = ort->u.dst.dev; |
1570 | if (rt->u.dst.dev) | |
1571 | dev_hold(rt->u.dst.dev); | |
1572 | rt->rt6i_idev = ort->rt6i_idev; | |
1573 | if (rt->rt6i_idev) | |
1574 | in6_dev_hold(rt->rt6i_idev); | |
1575 | rt->u.dst.lastuse = jiffies; | |
1576 | rt->rt6i_expires = 0; | |
1577 | ||
1578 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1579 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1580 | rt->rt6i_metric = 0; | |
1581 | ||
1582 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1583 | #ifdef CONFIG_IPV6_SUBTREES | |
1584 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1585 | #endif | |
c71099ac | 1586 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1587 | } |
1588 | return rt; | |
1589 | } | |
1590 | ||
70ceb4f5 YH |
1591 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1592 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1593 | struct in6_addr *gwaddr, int ifindex) | |
1594 | { | |
1595 | struct fib6_node *fn; | |
1596 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1597 | struct fib6_table *table; |
1598 | ||
1599 | table = fib6_get_table(RT6_TABLE_INFO); | |
1600 | if (table == NULL) | |
1601 | return NULL; | |
70ceb4f5 | 1602 | |
c71099ac TG |
1603 | write_lock_bh(&table->tb6_lock); |
1604 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1605 | if (!fn) |
1606 | goto out; | |
1607 | ||
7cc48263 | 1608 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { |
70ceb4f5 YH |
1609 | if (rt->rt6i_dev->ifindex != ifindex) |
1610 | continue; | |
1611 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1612 | continue; | |
1613 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1614 | continue; | |
1615 | dst_hold(&rt->u.dst); | |
1616 | break; | |
1617 | } | |
1618 | out: | |
c71099ac | 1619 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1620 | return rt; |
1621 | } | |
1622 | ||
1623 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1624 | struct in6_addr *gwaddr, int ifindex, | |
1625 | unsigned pref) | |
1626 | { | |
86872cb5 TG |
1627 | struct fib6_config cfg = { |
1628 | .fc_table = RT6_TABLE_INFO, | |
1629 | .fc_metric = 1024, | |
1630 | .fc_ifindex = ifindex, | |
1631 | .fc_dst_len = prefixlen, | |
1632 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1633 | RTF_UP | RTF_PREF(pref), | |
1634 | }; | |
1635 | ||
1636 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1637 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1638 | |
e317da96 YH |
1639 | /* We should treat it as a default route if prefix length is 0. */ |
1640 | if (!prefixlen) | |
86872cb5 | 1641 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1642 | |
86872cb5 | 1643 | ip6_route_add(&cfg); |
70ceb4f5 YH |
1644 | |
1645 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1646 | } | |
1647 | #endif | |
1648 | ||
1da177e4 | 1649 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1650 | { |
1da177e4 | 1651 | struct rt6_info *rt; |
c71099ac | 1652 | struct fib6_table *table; |
1da177e4 | 1653 | |
c71099ac TG |
1654 | table = fib6_get_table(RT6_TABLE_DFLT); |
1655 | if (table == NULL) | |
1656 | return NULL; | |
1da177e4 | 1657 | |
c71099ac | 1658 | write_lock_bh(&table->tb6_lock); |
7cc48263 | 1659 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { |
1da177e4 | 1660 | if (dev == rt->rt6i_dev && |
045927ff | 1661 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1662 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1663 | break; | |
1664 | } | |
1665 | if (rt) | |
1666 | dst_hold(&rt->u.dst); | |
c71099ac | 1667 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1668 | return rt; |
1669 | } | |
1670 | ||
1671 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1672 | struct net_device *dev, |
1673 | unsigned int pref) | |
1da177e4 | 1674 | { |
86872cb5 TG |
1675 | struct fib6_config cfg = { |
1676 | .fc_table = RT6_TABLE_DFLT, | |
1677 | .fc_metric = 1024, | |
1678 | .fc_ifindex = dev->ifindex, | |
1679 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1680 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
1681 | }; | |
1da177e4 | 1682 | |
86872cb5 | 1683 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1684 | |
86872cb5 | 1685 | ip6_route_add(&cfg); |
1da177e4 | 1686 | |
1da177e4 LT |
1687 | return rt6_get_dflt_router(gwaddr, dev); |
1688 | } | |
1689 | ||
1690 | void rt6_purge_dflt_routers(void) | |
1691 | { | |
1692 | struct rt6_info *rt; | |
c71099ac TG |
1693 | struct fib6_table *table; |
1694 | ||
1695 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
1696 | table = fib6_get_table(RT6_TABLE_DFLT); | |
1697 | if (table == NULL) | |
1698 | return; | |
1da177e4 LT |
1699 | |
1700 | restart: | |
c71099ac | 1701 | read_lock_bh(&table->tb6_lock); |
7cc48263 | 1702 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { |
1da177e4 LT |
1703 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1704 | dst_hold(&rt->u.dst); | |
c71099ac | 1705 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1706 | ip6_del_rt(rt); |
1da177e4 LT |
1707 | goto restart; |
1708 | } | |
1709 | } | |
c71099ac | 1710 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1711 | } |
1712 | ||
86872cb5 TG |
1713 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, |
1714 | struct fib6_config *cfg) | |
1715 | { | |
1716 | memset(cfg, 0, sizeof(*cfg)); | |
1717 | ||
1718 | cfg->fc_table = RT6_TABLE_MAIN; | |
1719 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1720 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1721 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1722 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1723 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1724 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1725 | ||
1726 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); | |
1727 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1728 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1729 | } | |
1730 | ||
1da177e4 LT |
1731 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
1732 | { | |
86872cb5 | 1733 | struct fib6_config cfg; |
1da177e4 LT |
1734 | struct in6_rtmsg rtmsg; |
1735 | int err; | |
1736 | ||
1737 | switch(cmd) { | |
1738 | case SIOCADDRT: /* Add a route */ | |
1739 | case SIOCDELRT: /* Delete a route */ | |
1740 | if (!capable(CAP_NET_ADMIN)) | |
1741 | return -EPERM; | |
1742 | err = copy_from_user(&rtmsg, arg, | |
1743 | sizeof(struct in6_rtmsg)); | |
1744 | if (err) | |
1745 | return -EFAULT; | |
86872cb5 TG |
1746 | |
1747 | rtmsg_to_fib6_config(&rtmsg, &cfg); | |
1748 | ||
1da177e4 LT |
1749 | rtnl_lock(); |
1750 | switch (cmd) { | |
1751 | case SIOCADDRT: | |
86872cb5 | 1752 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1753 | break; |
1754 | case SIOCDELRT: | |
86872cb5 | 1755 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1756 | break; |
1757 | default: | |
1758 | err = -EINVAL; | |
1759 | } | |
1760 | rtnl_unlock(); | |
1761 | ||
1762 | return err; | |
3ff50b79 | 1763 | } |
1da177e4 LT |
1764 | |
1765 | return -EINVAL; | |
1766 | } | |
1767 | ||
1768 | /* | |
1769 | * Drop the packet on the floor | |
1770 | */ | |
1771 | ||
612f09e8 YH |
1772 | static inline int ip6_pkt_drop(struct sk_buff *skb, int code, |
1773 | int ipstats_mib_noroutes) | |
1da177e4 | 1774 | { |
612f09e8 YH |
1775 | int type; |
1776 | switch (ipstats_mib_noroutes) { | |
1777 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1778 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
612f09e8 YH |
1779 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { |
1780 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1781 | break; | |
1782 | } | |
1783 | /* FALLTHROUGH */ | |
1784 | case IPSTATS_MIB_OUTNOROUTES: | |
1785 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1786 | break; | |
1787 | } | |
9ce8ade0 | 1788 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); |
1da177e4 LT |
1789 | kfree_skb(skb); |
1790 | return 0; | |
1791 | } | |
1792 | ||
9ce8ade0 TG |
1793 | static int ip6_pkt_discard(struct sk_buff *skb) |
1794 | { | |
612f09e8 | 1795 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1796 | } |
1797 | ||
20380731 | 1798 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1799 | { |
1800 | skb->dev = skb->dst->dev; | |
612f09e8 | 1801 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1802 | } |
1803 | ||
6723ab54 DM |
1804 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1805 | ||
9ce8ade0 TG |
1806 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1807 | { | |
612f09e8 | 1808 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1809 | } |
1810 | ||
1811 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1812 | { | |
1813 | skb->dev = skb->dst->dev; | |
612f09e8 | 1814 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1815 | } |
1816 | ||
1817 | static int ip6_pkt_blk_hole(struct sk_buff *skb) | |
1818 | { | |
1819 | kfree_skb(skb); | |
1820 | return 0; | |
1821 | } | |
1822 | ||
6723ab54 DM |
1823 | #endif |
1824 | ||
1da177e4 LT |
1825 | /* |
1826 | * Allocate a dst for local (unicast / anycast) address. | |
1827 | */ | |
1828 | ||
1829 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1830 | const struct in6_addr *addr, | |
1831 | int anycast) | |
1832 | { | |
1833 | struct rt6_info *rt = ip6_dst_alloc(); | |
1834 | ||
1835 | if (rt == NULL) | |
1836 | return ERR_PTR(-ENOMEM); | |
1837 | ||
1838 | dev_hold(&loopback_dev); | |
1839 | in6_dev_hold(idev); | |
1840 | ||
1841 | rt->u.dst.flags = DST_HOST; | |
1842 | rt->u.dst.input = ip6_input; | |
1843 | rt->u.dst.output = ip6_output; | |
1844 | rt->rt6i_dev = &loopback_dev; | |
1845 | rt->rt6i_idev = idev; | |
1846 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1847 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1848 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1849 | rt->u.dst.obsolete = -1; | |
1850 | ||
1851 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1852 | if (anycast) |
1853 | rt->rt6i_flags |= RTF_ANYCAST; | |
1854 | else | |
1da177e4 LT |
1855 | rt->rt6i_flags |= RTF_LOCAL; |
1856 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1857 | if (rt->rt6i_nexthop == NULL) { | |
40aa7b90 | 1858 | dst_free(&rt->u.dst); |
1da177e4 LT |
1859 | return ERR_PTR(-ENOMEM); |
1860 | } | |
1861 | ||
1862 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1863 | rt->rt6i_dst.plen = 128; | |
c71099ac | 1864 | rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL); |
1da177e4 LT |
1865 | |
1866 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1867 | ||
1868 | return rt; | |
1869 | } | |
1870 | ||
1871 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1872 | { | |
1873 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1874 | rt != &ip6_null_entry) { | |
1875 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1876 | return -1; | |
1877 | } | |
1878 | return 0; | |
1879 | } | |
1880 | ||
1881 | void rt6_ifdown(struct net_device *dev) | |
1882 | { | |
c71099ac | 1883 | fib6_clean_all(fib6_ifdown, 0, dev); |
1da177e4 LT |
1884 | } |
1885 | ||
1886 | struct rt6_mtu_change_arg | |
1887 | { | |
1888 | struct net_device *dev; | |
1889 | unsigned mtu; | |
1890 | }; | |
1891 | ||
1892 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1893 | { | |
1894 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1895 | struct inet6_dev *idev; | |
1896 | ||
1897 | /* In IPv6 pmtu discovery is not optional, | |
1898 | so that RTAX_MTU lock cannot disable it. | |
1899 | We still use this lock to block changes | |
1900 | caused by addrconf/ndisc. | |
1901 | */ | |
1902 | ||
1903 | idev = __in6_dev_get(arg->dev); | |
1904 | if (idev == NULL) | |
1905 | return 0; | |
1906 | ||
1907 | /* For administrative MTU increase, there is no way to discover | |
1908 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1909 | Since RFC 1981 doesn't include administrative MTU increase | |
1910 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1911 | */ | |
1912 | /* | |
1913 | If new MTU is less than route PMTU, this new MTU will be the | |
1914 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1915 | decreases; if new MTU is greater than route PMTU, and the | |
1916 | old MTU is the lowest MTU in the path, update the route PMTU | |
1917 | to reflect the increase. In this case if the other nodes' MTU | |
1918 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1919 | PMTU discouvery. | |
1920 | */ | |
1921 | if (rt->rt6i_dev == arg->dev && | |
1922 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
1ab1457c YH |
1923 | (dst_mtu(&rt->u.dst) > arg->mtu || |
1924 | (dst_mtu(&rt->u.dst) < arg->mtu && | |
1da177e4 LT |
1925 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) |
1926 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; | |
1927 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); | |
1928 | return 0; | |
1929 | } | |
1930 | ||
1931 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1932 | { | |
c71099ac TG |
1933 | struct rt6_mtu_change_arg arg = { |
1934 | .dev = dev, | |
1935 | .mtu = mtu, | |
1936 | }; | |
1da177e4 | 1937 | |
c71099ac | 1938 | fib6_clean_all(rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1939 | } |
1940 | ||
86872cb5 | 1941 | static struct nla_policy rtm_ipv6_policy[RTA_MAX+1] __read_mostly = { |
5176f91e | 1942 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1943 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1944 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1945 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1946 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1947 | }; | |
1948 | ||
1949 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1950 | struct fib6_config *cfg) | |
1da177e4 | 1951 | { |
86872cb5 TG |
1952 | struct rtmsg *rtm; |
1953 | struct nlattr *tb[RTA_MAX+1]; | |
1954 | int err; | |
1da177e4 | 1955 | |
86872cb5 TG |
1956 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1957 | if (err < 0) | |
1958 | goto errout; | |
1da177e4 | 1959 | |
86872cb5 TG |
1960 | err = -EINVAL; |
1961 | rtm = nlmsg_data(nlh); | |
1962 | memset(cfg, 0, sizeof(*cfg)); | |
1963 | ||
1964 | cfg->fc_table = rtm->rtm_table; | |
1965 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
1966 | cfg->fc_src_len = rtm->rtm_src_len; | |
1967 | cfg->fc_flags = RTF_UP; | |
1968 | cfg->fc_protocol = rtm->rtm_protocol; | |
1969 | ||
1970 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
1971 | cfg->fc_flags |= RTF_REJECT; | |
1972 | ||
1973 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
1974 | cfg->fc_nlinfo.nlh = nlh; | |
1975 | ||
1976 | if (tb[RTA_GATEWAY]) { | |
1977 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
1978 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 1979 | } |
86872cb5 TG |
1980 | |
1981 | if (tb[RTA_DST]) { | |
1982 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
1983 | ||
1984 | if (nla_len(tb[RTA_DST]) < plen) | |
1985 | goto errout; | |
1986 | ||
1987 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 1988 | } |
86872cb5 TG |
1989 | |
1990 | if (tb[RTA_SRC]) { | |
1991 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
1992 | ||
1993 | if (nla_len(tb[RTA_SRC]) < plen) | |
1994 | goto errout; | |
1995 | ||
1996 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 1997 | } |
86872cb5 TG |
1998 | |
1999 | if (tb[RTA_OIF]) | |
2000 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2001 | ||
2002 | if (tb[RTA_PRIORITY]) | |
2003 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2004 | ||
2005 | if (tb[RTA_METRICS]) { | |
2006 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2007 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2008 | } |
86872cb5 TG |
2009 | |
2010 | if (tb[RTA_TABLE]) | |
2011 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2012 | ||
2013 | err = 0; | |
2014 | errout: | |
2015 | return err; | |
1da177e4 LT |
2016 | } |
2017 | ||
c127ea2c | 2018 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2019 | { |
86872cb5 TG |
2020 | struct fib6_config cfg; |
2021 | int err; | |
1da177e4 | 2022 | |
86872cb5 TG |
2023 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2024 | if (err < 0) | |
2025 | return err; | |
2026 | ||
2027 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2028 | } |
2029 | ||
c127ea2c | 2030 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2031 | { |
86872cb5 TG |
2032 | struct fib6_config cfg; |
2033 | int err; | |
1da177e4 | 2034 | |
86872cb5 TG |
2035 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2036 | if (err < 0) | |
2037 | return err; | |
2038 | ||
2039 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2040 | } |
2041 | ||
339bf98f TG |
2042 | static inline size_t rt6_nlmsg_size(void) |
2043 | { | |
2044 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2045 | + nla_total_size(16) /* RTA_SRC */ | |
2046 | + nla_total_size(16) /* RTA_DST */ | |
2047 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2048 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2049 | + nla_total_size(4) /* RTA_TABLE */ | |
2050 | + nla_total_size(4) /* RTA_IIF */ | |
2051 | + nla_total_size(4) /* RTA_OIF */ | |
2052 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2053 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2054 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2055 | } | |
2056 | ||
1da177e4 | 2057 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
2058 | struct in6_addr *dst, struct in6_addr *src, |
2059 | int iif, int type, u32 pid, u32 seq, | |
2060 | int prefix, unsigned int flags) | |
1da177e4 LT |
2061 | { |
2062 | struct rtmsg *rtm; | |
2d7202bf | 2063 | struct nlmsghdr *nlh; |
e3703b3d | 2064 | long expires; |
9e762a4a | 2065 | u32 table; |
1da177e4 LT |
2066 | |
2067 | if (prefix) { /* user wants prefix routes only */ | |
2068 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2069 | /* success since this is not a prefix route */ | |
2070 | return 1; | |
2071 | } | |
2072 | } | |
2073 | ||
2d7202bf TG |
2074 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2075 | if (nlh == NULL) | |
26932566 | 2076 | return -EMSGSIZE; |
2d7202bf TG |
2077 | |
2078 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2079 | rtm->rtm_family = AF_INET6; |
2080 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2081 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2082 | rtm->rtm_tos = 0; | |
c71099ac | 2083 | if (rt->rt6i_table) |
9e762a4a | 2084 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2085 | else |
9e762a4a PM |
2086 | table = RT6_TABLE_UNSPEC; |
2087 | rtm->rtm_table = table; | |
2d7202bf | 2088 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2089 | if (rt->rt6i_flags&RTF_REJECT) |
2090 | rtm->rtm_type = RTN_UNREACHABLE; | |
2091 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2092 | rtm->rtm_type = RTN_LOCAL; | |
2093 | else | |
2094 | rtm->rtm_type = RTN_UNICAST; | |
2095 | rtm->rtm_flags = 0; | |
2096 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2097 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2098 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2099 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2100 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2101 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2102 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2103 | rtm->rtm_protocol = RTPROT_RA; | |
2104 | ||
2105 | if (rt->rt6i_flags&RTF_CACHE) | |
2106 | rtm->rtm_flags |= RTM_F_CLONED; | |
2107 | ||
2108 | if (dst) { | |
2d7202bf | 2109 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2110 | rtm->rtm_dst_len = 128; |
1da177e4 | 2111 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2112 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2113 | #ifdef CONFIG_IPV6_SUBTREES |
2114 | if (src) { | |
2d7202bf | 2115 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2116 | rtm->rtm_src_len = 128; |
1da177e4 | 2117 | } else if (rtm->rtm_src_len) |
2d7202bf | 2118 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2119 | #endif |
2120 | if (iif) | |
2d7202bf | 2121 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2122 | else if (dst) { |
2123 | struct in6_addr saddr_buf; | |
2124 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) | |
2d7202bf | 2125 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2126 | } |
2d7202bf | 2127 | |
1da177e4 | 2128 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2129 | goto nla_put_failure; |
2130 | ||
1da177e4 | 2131 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2132 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2133 | ||
1da177e4 | 2134 | if (rt->u.dst.dev) |
2d7202bf TG |
2135 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2136 | ||
2137 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d TG |
2138 | |
2139 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2140 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2141 | expires, rt->u.dst.error) < 0) | |
2142 | goto nla_put_failure; | |
2d7202bf TG |
2143 | |
2144 | return nlmsg_end(skb, nlh); | |
2145 | ||
2146 | nla_put_failure: | |
26932566 PM |
2147 | nlmsg_cancel(skb, nlh); |
2148 | return -EMSGSIZE; | |
1da177e4 LT |
2149 | } |
2150 | ||
1b43af54 | 2151 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2152 | { |
2153 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2154 | int prefix; | |
2155 | ||
2d7202bf TG |
2156 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2157 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2158 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2159 | } else | |
2160 | prefix = 0; | |
2161 | ||
2162 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2163 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2164 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2165 | } |
2166 | ||
c127ea2c | 2167 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2168 | { |
ab364a6f TG |
2169 | struct nlattr *tb[RTA_MAX+1]; |
2170 | struct rt6_info *rt; | |
1da177e4 | 2171 | struct sk_buff *skb; |
ab364a6f | 2172 | struct rtmsg *rtm; |
1da177e4 | 2173 | struct flowi fl; |
ab364a6f | 2174 | int err, iif = 0; |
1da177e4 | 2175 | |
ab364a6f TG |
2176 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2177 | if (err < 0) | |
2178 | goto errout; | |
1da177e4 | 2179 | |
ab364a6f | 2180 | err = -EINVAL; |
1da177e4 | 2181 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2182 | |
ab364a6f TG |
2183 | if (tb[RTA_SRC]) { |
2184 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2185 | goto errout; | |
2186 | ||
2187 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2188 | } | |
2189 | ||
2190 | if (tb[RTA_DST]) { | |
2191 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2192 | goto errout; | |
2193 | ||
2194 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2195 | } | |
2196 | ||
2197 | if (tb[RTA_IIF]) | |
2198 | iif = nla_get_u32(tb[RTA_IIF]); | |
2199 | ||
2200 | if (tb[RTA_OIF]) | |
2201 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2202 | |
2203 | if (iif) { | |
2204 | struct net_device *dev; | |
2205 | dev = __dev_get_by_index(iif); | |
2206 | if (!dev) { | |
2207 | err = -ENODEV; | |
ab364a6f | 2208 | goto errout; |
1da177e4 LT |
2209 | } |
2210 | } | |
2211 | ||
ab364a6f TG |
2212 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2213 | if (skb == NULL) { | |
2214 | err = -ENOBUFS; | |
2215 | goto errout; | |
2216 | } | |
1da177e4 | 2217 | |
ab364a6f TG |
2218 | /* Reserve room for dummy headers, this skb can pass |
2219 | through good chunk of routing engine. | |
2220 | */ | |
459a98ed | 2221 | skb_reset_mac_header(skb); |
ab364a6f | 2222 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2223 | |
ab364a6f | 2224 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2225 | skb->dst = &rt->u.dst; |
2226 | ||
ab364a6f | 2227 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2228 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2229 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2230 | if (err < 0) { |
ab364a6f TG |
2231 | kfree_skb(skb); |
2232 | goto errout; | |
1da177e4 LT |
2233 | } |
2234 | ||
2942e900 | 2235 | err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
ab364a6f | 2236 | errout: |
1da177e4 | 2237 | return err; |
1da177e4 LT |
2238 | } |
2239 | ||
86872cb5 | 2240 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2241 | { |
2242 | struct sk_buff *skb; | |
86872cb5 TG |
2243 | u32 pid = 0, seq = 0; |
2244 | struct nlmsghdr *nlh = NULL; | |
21713ebc TG |
2245 | int err = -ENOBUFS; |
2246 | ||
86872cb5 TG |
2247 | if (info) { |
2248 | pid = info->pid; | |
2249 | nlh = info->nlh; | |
2250 | if (nlh) | |
2251 | seq = nlh->nlmsg_seq; | |
2252 | } | |
2253 | ||
339bf98f | 2254 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2255 | if (skb == NULL) |
2256 | goto errout; | |
2257 | ||
2258 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0); | |
26932566 PM |
2259 | if (err < 0) { |
2260 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2261 | WARN_ON(err == -EMSGSIZE); | |
2262 | kfree_skb(skb); | |
2263 | goto errout; | |
2264 | } | |
21713ebc TG |
2265 | err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any()); |
2266 | errout: | |
2267 | if (err < 0) | |
2268 | rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err); | |
1da177e4 LT |
2269 | } |
2270 | ||
2271 | /* | |
2272 | * /proc | |
2273 | */ | |
2274 | ||
2275 | #ifdef CONFIG_PROC_FS | |
2276 | ||
2277 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2278 | ||
2279 | struct rt6_proc_arg | |
2280 | { | |
2281 | char *buffer; | |
2282 | int offset; | |
2283 | int length; | |
2284 | int skip; | |
2285 | int len; | |
2286 | }; | |
2287 | ||
2288 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2289 | { | |
2290 | struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg; | |
1da177e4 LT |
2291 | |
2292 | if (arg->skip < arg->offset / RT6_INFO_LEN) { | |
2293 | arg->skip++; | |
2294 | return 0; | |
2295 | } | |
2296 | ||
2297 | if (arg->len >= arg->length) | |
2298 | return 0; | |
2299 | ||
33e93c96 YH |
2300 | arg->len += sprintf(arg->buffer + arg->len, |
2301 | NIP6_SEQFMT " %02x ", | |
2302 | NIP6(rt->rt6i_dst.addr), | |
1da177e4 LT |
2303 | rt->rt6i_dst.plen); |
2304 | ||
2305 | #ifdef CONFIG_IPV6_SUBTREES | |
33e93c96 YH |
2306 | arg->len += sprintf(arg->buffer + arg->len, |
2307 | NIP6_SEQFMT " %02x ", | |
2308 | NIP6(rt->rt6i_src.addr), | |
1da177e4 LT |
2309 | rt->rt6i_src.plen); |
2310 | #else | |
33e93c96 YH |
2311 | arg->len += sprintf(arg->buffer + arg->len, |
2312 | "00000000000000000000000000000000 00 "); | |
1da177e4 LT |
2313 | #endif |
2314 | ||
2315 | if (rt->rt6i_nexthop) { | |
33e93c96 YH |
2316 | arg->len += sprintf(arg->buffer + arg->len, |
2317 | NIP6_SEQFMT, | |
2318 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
1da177e4 | 2319 | } else { |
33e93c96 YH |
2320 | arg->len += sprintf(arg->buffer + arg->len, |
2321 | "00000000000000000000000000000000"); | |
1da177e4 LT |
2322 | } |
2323 | arg->len += sprintf(arg->buffer + arg->len, | |
2324 | " %08x %08x %08x %08x %8s\n", | |
2325 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
1ab1457c | 2326 | rt->u.dst.__use, rt->rt6i_flags, |
1da177e4 LT |
2327 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); |
2328 | return 0; | |
2329 | } | |
2330 | ||
2331 | static int rt6_proc_info(char *buffer, char **start, off_t offset, int length) | |
2332 | { | |
c71099ac TG |
2333 | struct rt6_proc_arg arg = { |
2334 | .buffer = buffer, | |
2335 | .offset = offset, | |
2336 | .length = length, | |
2337 | }; | |
1da177e4 | 2338 | |
c71099ac | 2339 | fib6_clean_all(rt6_info_route, 0, &arg); |
1da177e4 LT |
2340 | |
2341 | *start = buffer; | |
2342 | if (offset) | |
2343 | *start += offset % RT6_INFO_LEN; | |
2344 | ||
2345 | arg.len -= offset % RT6_INFO_LEN; | |
2346 | ||
2347 | if (arg.len > length) | |
2348 | arg.len = length; | |
2349 | if (arg.len < 0) | |
2350 | arg.len = 0; | |
2351 | ||
2352 | return arg.len; | |
2353 | } | |
2354 | ||
1da177e4 LT |
2355 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2356 | { | |
2357 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
2358 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
2359 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
2360 | rt6_stats.fib_rt_cache, | |
2361 | atomic_read(&ip6_dst_ops.entries), | |
2362 | rt6_stats.fib_discarded_routes); | |
2363 | ||
2364 | return 0; | |
2365 | } | |
2366 | ||
2367 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2368 | { | |
2369 | return single_open(file, rt6_stats_seq_show, NULL); | |
2370 | } | |
2371 | ||
9a32144e | 2372 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2373 | .owner = THIS_MODULE, |
2374 | .open = rt6_stats_seq_open, | |
2375 | .read = seq_read, | |
2376 | .llseek = seq_lseek, | |
2377 | .release = single_release, | |
2378 | }; | |
2379 | #endif /* CONFIG_PROC_FS */ | |
2380 | ||
2381 | #ifdef CONFIG_SYSCTL | |
2382 | ||
2383 | static int flush_delay; | |
2384 | ||
2385 | static | |
2386 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2387 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2388 | { | |
2389 | if (write) { | |
2390 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2391 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); | |
2392 | return 0; | |
2393 | } else | |
2394 | return -EINVAL; | |
2395 | } | |
2396 | ||
2397 | ctl_table ipv6_route_table[] = { | |
1ab1457c YH |
2398 | { |
2399 | .ctl_name = NET_IPV6_ROUTE_FLUSH, | |
1da177e4 | 2400 | .procname = "flush", |
1ab1457c | 2401 | .data = &flush_delay, |
1da177e4 | 2402 | .maxlen = sizeof(int), |
89c8b3a1 | 2403 | .mode = 0200, |
1ab1457c | 2404 | .proc_handler = &ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2405 | }, |
2406 | { | |
2407 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2408 | .procname = "gc_thresh", | |
1ab1457c | 2409 | .data = &ip6_dst_ops.gc_thresh, |
1da177e4 LT |
2410 | .maxlen = sizeof(int), |
2411 | .mode = 0644, | |
1ab1457c | 2412 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2413 | }, |
2414 | { | |
2415 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2416 | .procname = "max_size", | |
1ab1457c | 2417 | .data = &ip6_rt_max_size, |
1da177e4 LT |
2418 | .maxlen = sizeof(int), |
2419 | .mode = 0644, | |
1ab1457c | 2420 | .proc_handler = &proc_dointvec, |
1da177e4 LT |
2421 | }, |
2422 | { | |
2423 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2424 | .procname = "gc_min_interval", | |
1ab1457c | 2425 | .data = &ip6_rt_gc_min_interval, |
1da177e4 LT |
2426 | .maxlen = sizeof(int), |
2427 | .mode = 0644, | |
1ab1457c | 2428 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2429 | .strategy = &sysctl_jiffies, |
2430 | }, | |
2431 | { | |
2432 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2433 | .procname = "gc_timeout", | |
1ab1457c | 2434 | .data = &ip6_rt_gc_timeout, |
1da177e4 LT |
2435 | .maxlen = sizeof(int), |
2436 | .mode = 0644, | |
1ab1457c | 2437 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2438 | .strategy = &sysctl_jiffies, |
2439 | }, | |
2440 | { | |
2441 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2442 | .procname = "gc_interval", | |
1ab1457c | 2443 | .data = &ip6_rt_gc_interval, |
1da177e4 LT |
2444 | .maxlen = sizeof(int), |
2445 | .mode = 0644, | |
1ab1457c | 2446 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2447 | .strategy = &sysctl_jiffies, |
2448 | }, | |
2449 | { | |
2450 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2451 | .procname = "gc_elasticity", | |
1ab1457c | 2452 | .data = &ip6_rt_gc_elasticity, |
1da177e4 LT |
2453 | .maxlen = sizeof(int), |
2454 | .mode = 0644, | |
1ab1457c | 2455 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2456 | .strategy = &sysctl_jiffies, |
2457 | }, | |
2458 | { | |
2459 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2460 | .procname = "mtu_expires", | |
1ab1457c | 2461 | .data = &ip6_rt_mtu_expires, |
1da177e4 LT |
2462 | .maxlen = sizeof(int), |
2463 | .mode = 0644, | |
1ab1457c | 2464 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2465 | .strategy = &sysctl_jiffies, |
2466 | }, | |
2467 | { | |
2468 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2469 | .procname = "min_adv_mss", | |
1ab1457c | 2470 | .data = &ip6_rt_min_advmss, |
1da177e4 LT |
2471 | .maxlen = sizeof(int), |
2472 | .mode = 0644, | |
1ab1457c | 2473 | .proc_handler = &proc_dointvec_jiffies, |
1da177e4 LT |
2474 | .strategy = &sysctl_jiffies, |
2475 | }, | |
2476 | { | |
2477 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2478 | .procname = "gc_min_interval_ms", | |
1ab1457c | 2479 | .data = &ip6_rt_gc_min_interval, |
1da177e4 LT |
2480 | .maxlen = sizeof(int), |
2481 | .mode = 0644, | |
1ab1457c | 2482 | .proc_handler = &proc_dointvec_ms_jiffies, |
1da177e4 LT |
2483 | .strategy = &sysctl_ms_jiffies, |
2484 | }, | |
2485 | { .ctl_name = 0 } | |
2486 | }; | |
2487 | ||
2488 | #endif | |
2489 | ||
2490 | void __init ip6_route_init(void) | |
2491 | { | |
2492 | struct proc_dir_entry *p; | |
2493 | ||
e5d679f3 AD |
2494 | ip6_dst_ops.kmem_cachep = |
2495 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
2496 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL); | |
1da177e4 LT |
2497 | fib6_init(); |
2498 | #ifdef CONFIG_PROC_FS | |
2499 | p = proc_net_create("ipv6_route", 0, rt6_proc_info); | |
2500 | if (p) | |
2501 | p->owner = THIS_MODULE; | |
2502 | ||
2503 | proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2504 | #endif | |
2505 | #ifdef CONFIG_XFRM | |
2506 | xfrm6_init(); | |
2507 | #endif | |
101367c2 TG |
2508 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2509 | fib6_rules_init(); | |
2510 | #endif | |
c127ea2c TG |
2511 | |
2512 | __rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL); | |
2513 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL); | |
2514 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL); | |
1da177e4 LT |
2515 | } |
2516 | ||
2517 | void ip6_route_cleanup(void) | |
2518 | { | |
101367c2 TG |
2519 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2520 | fib6_rules_cleanup(); | |
2521 | #endif | |
1da177e4 LT |
2522 | #ifdef CONFIG_PROC_FS |
2523 | proc_net_remove("ipv6_route"); | |
2524 | proc_net_remove("rt6_stats"); | |
2525 | #endif | |
2526 | #ifdef CONFIG_XFRM | |
2527 | xfrm6_fini(); | |
2528 | #endif | |
2529 | rt6_ifdown(NULL); | |
2530 | fib6_gc_cleanup(); | |
2531 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2532 | } |