Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
7 | * | |
8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | /* Changes: | |
17 | * | |
18 | * YOSHIFUJI Hideaki @USAGI | |
19 | * reworked default router selection. | |
20 | * - respect outgoing interface | |
21 | * - select from (probably) reachable routers (i.e. | |
22 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
23 | * - always select the same router if it is (probably) | |
24 | * reachable. otherwise, round-robin the list. | |
25 | */ | |
26 | ||
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/times.h> | |
31 | #include <linux/socket.h> | |
32 | #include <linux/sockios.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/route.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/in6.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/netlink.h> | |
39 | #include <linux/if_arp.h> | |
40 | ||
41 | #ifdef CONFIG_PROC_FS | |
42 | #include <linux/proc_fs.h> | |
43 | #include <linux/seq_file.h> | |
44 | #endif | |
45 | ||
46 | #include <net/snmp.h> | |
47 | #include <net/ipv6.h> | |
48 | #include <net/ip6_fib.h> | |
49 | #include <net/ip6_route.h> | |
50 | #include <net/ndisc.h> | |
51 | #include <net/addrconf.h> | |
52 | #include <net/tcp.h> | |
53 | #include <linux/rtnetlink.h> | |
54 | #include <net/dst.h> | |
55 | #include <net/xfrm.h> | |
8d71740c | 56 | #include <net/netevent.h> |
1da177e4 LT |
57 | |
58 | #include <asm/uaccess.h> | |
59 | ||
60 | #ifdef CONFIG_SYSCTL | |
61 | #include <linux/sysctl.h> | |
62 | #endif | |
63 | ||
64 | /* Set to 3 to get tracing. */ | |
65 | #define RT6_DEBUG 2 | |
66 | ||
67 | #if RT6_DEBUG >= 3 | |
68 | #define RDBG(x) printk x | |
69 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
70 | #else | |
71 | #define RDBG(x) | |
72 | #define RT6_TRACE(x...) do { ; } while (0) | |
73 | #endif | |
74 | ||
519fbd87 | 75 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 | 76 | |
554cfb7e YH |
77 | #define RT6_SELECT_F_IFACE 0x1 |
78 | #define RT6_SELECT_F_REACHABLE 0x2 | |
79 | ||
1da177e4 LT |
80 | static int ip6_rt_max_size = 4096; |
81 | static int ip6_rt_gc_min_interval = HZ / 2; | |
82 | static int ip6_rt_gc_timeout = 60*HZ; | |
83 | int ip6_rt_gc_interval = 30*HZ; | |
84 | static int ip6_rt_gc_elasticity = 9; | |
85 | static int ip6_rt_mtu_expires = 10*60*HZ; | |
86 | static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
87 | ||
88 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); | |
89 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
90 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
91 | static void ip6_dst_destroy(struct dst_entry *); | |
92 | static void ip6_dst_ifdown(struct dst_entry *, | |
93 | struct net_device *dev, int how); | |
94 | static int ip6_dst_gc(void); | |
95 | ||
96 | static int ip6_pkt_discard(struct sk_buff *skb); | |
97 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
98 | static void ip6_link_failure(struct sk_buff *skb); | |
99 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
100 | ||
70ceb4f5 YH |
101 | #ifdef CONFIG_IPV6_ROUTE_INFO |
102 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
103 | struct in6_addr *gwaddr, int ifindex, | |
104 | unsigned pref); | |
105 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
106 | struct in6_addr *gwaddr, int ifindex); | |
107 | #endif | |
108 | ||
1da177e4 LT |
109 | static struct dst_ops ip6_dst_ops = { |
110 | .family = AF_INET6, | |
111 | .protocol = __constant_htons(ETH_P_IPV6), | |
112 | .gc = ip6_dst_gc, | |
113 | .gc_thresh = 1024, | |
114 | .check = ip6_dst_check, | |
115 | .destroy = ip6_dst_destroy, | |
116 | .ifdown = ip6_dst_ifdown, | |
117 | .negative_advice = ip6_negative_advice, | |
118 | .link_failure = ip6_link_failure, | |
119 | .update_pmtu = ip6_rt_update_pmtu, | |
120 | .entry_size = sizeof(struct rt6_info), | |
121 | }; | |
122 | ||
123 | struct rt6_info ip6_null_entry = { | |
124 | .u = { | |
125 | .dst = { | |
126 | .__refcnt = ATOMIC_INIT(1), | |
127 | .__use = 1, | |
128 | .dev = &loopback_dev, | |
129 | .obsolete = -1, | |
130 | .error = -ENETUNREACH, | |
131 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
132 | .input = ip6_pkt_discard, | |
133 | .output = ip6_pkt_discard_out, | |
134 | .ops = &ip6_dst_ops, | |
135 | .path = (struct dst_entry*)&ip6_null_entry, | |
136 | } | |
137 | }, | |
138 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
139 | .rt6i_metric = ~(u32) 0, | |
140 | .rt6i_ref = ATOMIC_INIT(1), | |
141 | }; | |
142 | ||
101367c2 TG |
143 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
144 | ||
145 | struct rt6_info ip6_prohibit_entry = { | |
146 | .u = { | |
147 | .dst = { | |
148 | .__refcnt = ATOMIC_INIT(1), | |
149 | .__use = 1, | |
150 | .dev = &loopback_dev, | |
151 | .obsolete = -1, | |
152 | .error = -EACCES, | |
153 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
154 | .input = ip6_pkt_discard, | |
155 | .output = ip6_pkt_discard_out, | |
156 | .ops = &ip6_dst_ops, | |
157 | .path = (struct dst_entry*)&ip6_prohibit_entry, | |
158 | } | |
159 | }, | |
160 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
161 | .rt6i_metric = ~(u32) 0, | |
162 | .rt6i_ref = ATOMIC_INIT(1), | |
163 | }; | |
164 | ||
165 | struct rt6_info ip6_blk_hole_entry = { | |
166 | .u = { | |
167 | .dst = { | |
168 | .__refcnt = ATOMIC_INIT(1), | |
169 | .__use = 1, | |
170 | .dev = &loopback_dev, | |
171 | .obsolete = -1, | |
172 | .error = -EINVAL, | |
173 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
174 | .input = ip6_pkt_discard, | |
175 | .output = ip6_pkt_discard_out, | |
176 | .ops = &ip6_dst_ops, | |
177 | .path = (struct dst_entry*)&ip6_blk_hole_entry, | |
178 | } | |
179 | }, | |
180 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
181 | .rt6i_metric = ~(u32) 0, | |
182 | .rt6i_ref = ATOMIC_INIT(1), | |
183 | }; | |
184 | ||
185 | #endif | |
186 | ||
1da177e4 LT |
187 | /* allocate dst with ip6_dst_ops */ |
188 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
189 | { | |
190 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
191 | } | |
192 | ||
193 | static void ip6_dst_destroy(struct dst_entry *dst) | |
194 | { | |
195 | struct rt6_info *rt = (struct rt6_info *)dst; | |
196 | struct inet6_dev *idev = rt->rt6i_idev; | |
197 | ||
198 | if (idev != NULL) { | |
199 | rt->rt6i_idev = NULL; | |
200 | in6_dev_put(idev); | |
201 | } | |
202 | } | |
203 | ||
204 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
205 | int how) | |
206 | { | |
207 | struct rt6_info *rt = (struct rt6_info *)dst; | |
208 | struct inet6_dev *idev = rt->rt6i_idev; | |
209 | ||
210 | if (dev != &loopback_dev && idev != NULL && idev->dev == dev) { | |
211 | struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev); | |
212 | if (loopback_idev != NULL) { | |
213 | rt->rt6i_idev = loopback_idev; | |
214 | in6_dev_put(idev); | |
215 | } | |
216 | } | |
217 | } | |
218 | ||
219 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
220 | { | |
221 | return (rt->rt6i_flags & RTF_EXPIRES && | |
222 | time_after(jiffies, rt->rt6i_expires)); | |
223 | } | |
224 | ||
c71099ac TG |
225 | static inline int rt6_need_strict(struct in6_addr *daddr) |
226 | { | |
227 | return (ipv6_addr_type(daddr) & | |
228 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
229 | } | |
230 | ||
1da177e4 | 231 | /* |
c71099ac | 232 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
233 | */ |
234 | ||
235 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
236 | int oif, | |
237 | int strict) | |
238 | { | |
239 | struct rt6_info *local = NULL; | |
240 | struct rt6_info *sprt; | |
241 | ||
242 | if (oif) { | |
243 | for (sprt = rt; sprt; sprt = sprt->u.next) { | |
244 | struct net_device *dev = sprt->rt6i_dev; | |
245 | if (dev->ifindex == oif) | |
246 | return sprt; | |
247 | if (dev->flags & IFF_LOOPBACK) { | |
248 | if (sprt->rt6i_idev == NULL || | |
249 | sprt->rt6i_idev->dev->ifindex != oif) { | |
250 | if (strict && oif) | |
251 | continue; | |
252 | if (local && (!oif || | |
253 | local->rt6i_idev->dev->ifindex == oif)) | |
254 | continue; | |
255 | } | |
256 | local = sprt; | |
257 | } | |
258 | } | |
259 | ||
260 | if (local) | |
261 | return local; | |
262 | ||
263 | if (strict) | |
264 | return &ip6_null_entry; | |
265 | } | |
266 | return rt; | |
267 | } | |
268 | ||
27097255 YH |
269 | #ifdef CONFIG_IPV6_ROUTER_PREF |
270 | static void rt6_probe(struct rt6_info *rt) | |
271 | { | |
272 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
273 | /* | |
274 | * Okay, this does not seem to be appropriate | |
275 | * for now, however, we need to check if it | |
276 | * is really so; aka Router Reachability Probing. | |
277 | * | |
278 | * Router Reachability Probe MUST be rate-limited | |
279 | * to no more than one per minute. | |
280 | */ | |
281 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
282 | return; | |
283 | read_lock_bh(&neigh->lock); | |
284 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 285 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
286 | struct in6_addr mcaddr; |
287 | struct in6_addr *target; | |
288 | ||
289 | neigh->updated = jiffies; | |
290 | read_unlock_bh(&neigh->lock); | |
291 | ||
292 | target = (struct in6_addr *)&neigh->primary_key; | |
293 | addrconf_addr_solict_mult(target, &mcaddr); | |
294 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
295 | } else | |
296 | read_unlock_bh(&neigh->lock); | |
297 | } | |
298 | #else | |
299 | static inline void rt6_probe(struct rt6_info *rt) | |
300 | { | |
301 | return; | |
302 | } | |
303 | #endif | |
304 | ||
1da177e4 | 305 | /* |
554cfb7e | 306 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 307 | */ |
554cfb7e YH |
308 | static int inline rt6_check_dev(struct rt6_info *rt, int oif) |
309 | { | |
310 | struct net_device *dev = rt->rt6i_dev; | |
311 | if (!oif || dev->ifindex == oif) | |
312 | return 2; | |
313 | if ((dev->flags & IFF_LOOPBACK) && | |
314 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
315 | return 1; | |
316 | return 0; | |
317 | } | |
1da177e4 | 318 | |
554cfb7e | 319 | static int inline rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 320 | { |
554cfb7e YH |
321 | struct neighbour *neigh = rt->rt6i_nexthop; |
322 | int m = 0; | |
4d0c5911 YH |
323 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
324 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
325 | m = 1; | |
326 | else if (neigh) { | |
554cfb7e YH |
327 | read_lock_bh(&neigh->lock); |
328 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 329 | m = 2; |
554cfb7e | 330 | read_unlock_bh(&neigh->lock); |
1da177e4 | 331 | } |
554cfb7e | 332 | return m; |
1da177e4 LT |
333 | } |
334 | ||
554cfb7e YH |
335 | static int rt6_score_route(struct rt6_info *rt, int oif, |
336 | int strict) | |
1da177e4 | 337 | { |
4d0c5911 YH |
338 | int m, n; |
339 | ||
340 | m = rt6_check_dev(rt, oif); | |
554cfb7e YH |
341 | if (!m && (strict & RT6_SELECT_F_IFACE)) |
342 | return -1; | |
ebacaaa0 YH |
343 | #ifdef CONFIG_IPV6_ROUTER_PREF |
344 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
345 | #endif | |
4d0c5911 YH |
346 | n = rt6_check_neigh(rt); |
347 | if (n > 1) | |
ebacaaa0 | 348 | m |= 16; |
4d0c5911 | 349 | else if (!n && strict & RT6_SELECT_F_REACHABLE) |
554cfb7e YH |
350 | return -1; |
351 | return m; | |
352 | } | |
353 | ||
354 | static struct rt6_info *rt6_select(struct rt6_info **head, int oif, | |
355 | int strict) | |
356 | { | |
357 | struct rt6_info *match = NULL, *last = NULL; | |
358 | struct rt6_info *rt, *rt0 = *head; | |
359 | u32 metric; | |
360 | int mpri = -1; | |
1da177e4 | 361 | |
554cfb7e YH |
362 | RT6_TRACE("%s(head=%p(*head=%p), oif=%d)\n", |
363 | __FUNCTION__, head, head ? *head : NULL, oif); | |
1da177e4 | 364 | |
554cfb7e | 365 | for (rt = rt0, metric = rt0->rt6i_metric; |
c302e6d5 | 366 | rt && rt->rt6i_metric == metric && (!last || rt != rt0); |
554cfb7e YH |
367 | rt = rt->u.next) { |
368 | int m; | |
1da177e4 | 369 | |
554cfb7e | 370 | if (rt6_check_expired(rt)) |
1da177e4 LT |
371 | continue; |
372 | ||
554cfb7e YH |
373 | last = rt; |
374 | ||
375 | m = rt6_score_route(rt, oif, strict); | |
376 | if (m < 0) | |
1da177e4 | 377 | continue; |
1da177e4 | 378 | |
554cfb7e | 379 | if (m > mpri) { |
27097255 | 380 | rt6_probe(match); |
554cfb7e | 381 | match = rt; |
1da177e4 | 382 | mpri = m; |
27097255 YH |
383 | } else { |
384 | rt6_probe(rt); | |
1da177e4 LT |
385 | } |
386 | } | |
387 | ||
554cfb7e YH |
388 | if (!match && |
389 | (strict & RT6_SELECT_F_REACHABLE) && | |
390 | last && last != rt0) { | |
391 | /* no entries matched; do round-robin */ | |
34af946a | 392 | static DEFINE_SPINLOCK(lock); |
c302e6d5 | 393 | spin_lock(&lock); |
554cfb7e YH |
394 | *head = rt0->u.next; |
395 | rt0->u.next = last->u.next; | |
396 | last->u.next = rt0; | |
c302e6d5 | 397 | spin_unlock(&lock); |
1da177e4 | 398 | } |
1da177e4 | 399 | |
554cfb7e YH |
400 | RT6_TRACE("%s() => %p, score=%d\n", |
401 | __FUNCTION__, match, mpri); | |
1da177e4 | 402 | |
554cfb7e | 403 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
404 | } |
405 | ||
70ceb4f5 YH |
406 | #ifdef CONFIG_IPV6_ROUTE_INFO |
407 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
408 | struct in6_addr *gwaddr) | |
409 | { | |
410 | struct route_info *rinfo = (struct route_info *) opt; | |
411 | struct in6_addr prefix_buf, *prefix; | |
412 | unsigned int pref; | |
413 | u32 lifetime; | |
414 | struct rt6_info *rt; | |
415 | ||
416 | if (len < sizeof(struct route_info)) { | |
417 | return -EINVAL; | |
418 | } | |
419 | ||
420 | /* Sanity check for prefix_len and length */ | |
421 | if (rinfo->length > 3) { | |
422 | return -EINVAL; | |
423 | } else if (rinfo->prefix_len > 128) { | |
424 | return -EINVAL; | |
425 | } else if (rinfo->prefix_len > 64) { | |
426 | if (rinfo->length < 2) { | |
427 | return -EINVAL; | |
428 | } | |
429 | } else if (rinfo->prefix_len > 0) { | |
430 | if (rinfo->length < 1) { | |
431 | return -EINVAL; | |
432 | } | |
433 | } | |
434 | ||
435 | pref = rinfo->route_pref; | |
436 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
437 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
438 | ||
439 | lifetime = htonl(rinfo->lifetime); | |
440 | if (lifetime == 0xffffffff) { | |
441 | /* infinity */ | |
442 | } else if (lifetime > 0x7fffffff/HZ) { | |
443 | /* Avoid arithmetic overflow */ | |
444 | lifetime = 0x7fffffff/HZ - 1; | |
445 | } | |
446 | ||
447 | if (rinfo->length == 3) | |
448 | prefix = (struct in6_addr *)rinfo->prefix; | |
449 | else { | |
450 | /* this function is safe */ | |
451 | ipv6_addr_prefix(&prefix_buf, | |
452 | (struct in6_addr *)rinfo->prefix, | |
453 | rinfo->prefix_len); | |
454 | prefix = &prefix_buf; | |
455 | } | |
456 | ||
457 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
458 | ||
459 | if (rt && !lifetime) { | |
460 | ip6_del_rt(rt, NULL, NULL, NULL); | |
461 | rt = NULL; | |
462 | } | |
463 | ||
464 | if (!rt && lifetime) | |
465 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
466 | pref); | |
467 | else if (rt) | |
468 | rt->rt6i_flags = RTF_ROUTEINFO | | |
469 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
470 | ||
471 | if (rt) { | |
472 | if (lifetime == 0xffffffff) { | |
473 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
474 | } else { | |
475 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
476 | rt->rt6i_flags |= RTF_EXPIRES; | |
477 | } | |
478 | dst_release(&rt->u.dst); | |
479 | } | |
480 | return 0; | |
481 | } | |
482 | #endif | |
483 | ||
c71099ac TG |
484 | #define BACKTRACK() \ |
485 | if (rt == &ip6_null_entry && flags & RT6_F_STRICT) { \ | |
486 | while ((fn = fn->parent) != NULL) { \ | |
487 | if (fn->fn_flags & RTN_TL_ROOT) { \ | |
488 | dst_hold(&rt->u.dst); \ | |
489 | goto out; \ | |
490 | } \ | |
491 | if (fn->fn_flags & RTN_RTINFO) \ | |
492 | goto restart; \ | |
493 | } \ | |
494 | } | |
495 | ||
496 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
497 | struct flowi *fl, int flags) | |
1da177e4 LT |
498 | { |
499 | struct fib6_node *fn; | |
500 | struct rt6_info *rt; | |
501 | ||
c71099ac TG |
502 | read_lock_bh(&table->tb6_lock); |
503 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
504 | restart: | |
505 | rt = fn->leaf; | |
506 | rt = rt6_device_match(rt, fl->oif, flags & RT6_F_STRICT); | |
507 | BACKTRACK(); | |
1da177e4 | 508 | dst_hold(&rt->u.dst); |
c71099ac TG |
509 | out: |
510 | read_unlock_bh(&table->tb6_lock); | |
1da177e4 LT |
511 | |
512 | rt->u.dst.lastuse = jiffies; | |
c71099ac TG |
513 | rt->u.dst.__use++; |
514 | ||
515 | return rt; | |
516 | ||
517 | } | |
518 | ||
519 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, | |
520 | int oif, int strict) | |
521 | { | |
522 | struct flowi fl = { | |
523 | .oif = oif, | |
524 | .nl_u = { | |
525 | .ip6_u = { | |
526 | .daddr = *daddr, | |
527 | /* TODO: saddr */ | |
528 | }, | |
529 | }, | |
530 | }; | |
531 | struct dst_entry *dst; | |
532 | int flags = strict ? RT6_F_STRICT : 0; | |
533 | ||
534 | dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup); | |
535 | if (dst->error == 0) | |
536 | return (struct rt6_info *) dst; | |
537 | ||
538 | dst_release(dst); | |
539 | ||
1da177e4 LT |
540 | return NULL; |
541 | } | |
542 | ||
c71099ac | 543 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
544 | It takes new route entry, the addition fails by any reason the |
545 | route is freed. In any case, if caller does not hold it, it may | |
546 | be destroyed. | |
547 | */ | |
548 | ||
0d51aa80 JHS |
549 | int ip6_ins_rt(struct rt6_info *rt, struct nlmsghdr *nlh, |
550 | void *_rtattr, struct netlink_skb_parms *req) | |
1da177e4 LT |
551 | { |
552 | int err; | |
c71099ac | 553 | struct fib6_table *table; |
1da177e4 | 554 | |
c71099ac TG |
555 | table = rt->rt6i_table; |
556 | write_lock_bh(&table->tb6_lock); | |
557 | err = fib6_add(&table->tb6_root, rt, nlh, _rtattr, req); | |
558 | write_unlock_bh(&table->tb6_lock); | |
1da177e4 LT |
559 | |
560 | return err; | |
561 | } | |
562 | ||
95a9a5ba YH |
563 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
564 | struct in6_addr *saddr) | |
1da177e4 | 565 | { |
1da177e4 LT |
566 | struct rt6_info *rt; |
567 | ||
568 | /* | |
569 | * Clone the route. | |
570 | */ | |
571 | ||
572 | rt = ip6_rt_copy(ort); | |
573 | ||
574 | if (rt) { | |
58c4fb86 YH |
575 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
576 | if (rt->rt6i_dst.plen != 128 && | |
577 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
578 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 579 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 580 | } |
1da177e4 | 581 | |
58c4fb86 | 582 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
583 | rt->rt6i_dst.plen = 128; |
584 | rt->rt6i_flags |= RTF_CACHE; | |
585 | rt->u.dst.flags |= DST_HOST; | |
586 | ||
587 | #ifdef CONFIG_IPV6_SUBTREES | |
588 | if (rt->rt6i_src.plen && saddr) { | |
589 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
590 | rt->rt6i_src.plen = 128; | |
591 | } | |
592 | #endif | |
593 | ||
594 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
595 | ||
95a9a5ba | 596 | } |
1da177e4 | 597 | |
95a9a5ba YH |
598 | return rt; |
599 | } | |
1da177e4 | 600 | |
299d9939 YH |
601 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
602 | { | |
603 | struct rt6_info *rt = ip6_rt_copy(ort); | |
604 | if (rt) { | |
605 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
606 | rt->rt6i_dst.plen = 128; | |
607 | rt->rt6i_flags |= RTF_CACHE; | |
608 | if (rt->rt6i_flags & RTF_REJECT) | |
609 | rt->u.dst.error = ort->u.dst.error; | |
610 | rt->u.dst.flags |= DST_HOST; | |
611 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
612 | } | |
613 | return rt; | |
614 | } | |
615 | ||
c71099ac TG |
616 | struct rt6_info *ip6_pol_route_input(struct fib6_table *table, struct flowi *fl, |
617 | int flags) | |
1da177e4 LT |
618 | { |
619 | struct fib6_node *fn; | |
519fbd87 | 620 | struct rt6_info *rt, *nrt; |
c71099ac | 621 | int strict = 0; |
1da177e4 | 622 | int attempts = 3; |
519fbd87 | 623 | int err; |
8238dd06 | 624 | int reachable = RT6_SELECT_F_REACHABLE; |
1da177e4 | 625 | |
c71099ac TG |
626 | if (flags & RT6_F_STRICT) |
627 | strict = RT6_SELECT_F_IFACE; | |
1da177e4 LT |
628 | |
629 | relookup: | |
c71099ac | 630 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 631 | |
8238dd06 | 632 | restart_2: |
c71099ac | 633 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
634 | |
635 | restart: | |
c71099ac | 636 | rt = rt6_select(&fn->leaf, fl->iif, strict | reachable); |
1da177e4 | 637 | BACKTRACK(); |
8238dd06 YH |
638 | if (rt == &ip6_null_entry || |
639 | rt->rt6i_flags & RTF_CACHE) | |
1ddef044 | 640 | goto out; |
1da177e4 | 641 | |
fb9de91e | 642 | dst_hold(&rt->u.dst); |
c71099ac | 643 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 644 | |
519fbd87 | 645 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 646 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
647 | else { |
648 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 649 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
650 | #else |
651 | goto out2; | |
652 | #endif | |
653 | } | |
e40cf353 | 654 | |
519fbd87 YH |
655 | dst_release(&rt->u.dst); |
656 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 657 | |
519fbd87 YH |
658 | dst_hold(&rt->u.dst); |
659 | if (nrt) { | |
c71099ac | 660 | err = ip6_ins_rt(nrt, NULL, NULL, NULL); |
519fbd87 | 661 | if (!err) |
1da177e4 | 662 | goto out2; |
1da177e4 | 663 | } |
1da177e4 | 664 | |
519fbd87 YH |
665 | if (--attempts <= 0) |
666 | goto out2; | |
667 | ||
668 | /* | |
c71099ac | 669 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
670 | * released someone could insert this route. Relookup. |
671 | */ | |
672 | dst_release(&rt->u.dst); | |
673 | goto relookup; | |
674 | ||
675 | out: | |
8238dd06 YH |
676 | if (reachable) { |
677 | reachable = 0; | |
678 | goto restart_2; | |
679 | } | |
519fbd87 | 680 | dst_hold(&rt->u.dst); |
c71099ac | 681 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
682 | out2: |
683 | rt->u.dst.lastuse = jiffies; | |
684 | rt->u.dst.__use++; | |
c71099ac TG |
685 | |
686 | return rt; | |
1da177e4 LT |
687 | } |
688 | ||
c71099ac TG |
689 | void ip6_route_input(struct sk_buff *skb) |
690 | { | |
691 | struct ipv6hdr *iph = skb->nh.ipv6h; | |
692 | struct flowi fl = { | |
693 | .iif = skb->dev->ifindex, | |
694 | .nl_u = { | |
695 | .ip6_u = { | |
696 | .daddr = iph->daddr, | |
697 | .saddr = iph->saddr, | |
698 | .flowlabel = (* (u32 *) iph)&IPV6_FLOWINFO_MASK, | |
699 | }, | |
700 | }, | |
701 | .proto = iph->nexthdr, | |
702 | }; | |
703 | int flags = 0; | |
704 | ||
705 | if (rt6_need_strict(&iph->daddr)) | |
706 | flags |= RT6_F_STRICT; | |
707 | ||
708 | skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input); | |
709 | } | |
710 | ||
711 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
712 | struct flowi *fl, int flags) | |
1da177e4 LT |
713 | { |
714 | struct fib6_node *fn; | |
519fbd87 | 715 | struct rt6_info *rt, *nrt; |
c71099ac | 716 | int strict = 0; |
1da177e4 | 717 | int attempts = 3; |
519fbd87 | 718 | int err; |
8238dd06 | 719 | int reachable = RT6_SELECT_F_REACHABLE; |
1da177e4 | 720 | |
c71099ac TG |
721 | if (flags & RT6_F_STRICT) |
722 | strict = RT6_SELECT_F_IFACE; | |
1da177e4 LT |
723 | |
724 | relookup: | |
c71099ac | 725 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 726 | |
8238dd06 | 727 | restart_2: |
c71099ac | 728 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
729 | |
730 | restart: | |
8238dd06 | 731 | rt = rt6_select(&fn->leaf, fl->oif, strict | reachable); |
1ddef044 | 732 | BACKTRACK(); |
8238dd06 YH |
733 | if (rt == &ip6_null_entry || |
734 | rt->rt6i_flags & RTF_CACHE) | |
1da177e4 | 735 | goto out; |
1da177e4 | 736 | |
fb9de91e | 737 | dst_hold(&rt->u.dst); |
c71099ac | 738 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 739 | |
519fbd87 | 740 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
e40cf353 | 741 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
742 | else { |
743 | #if CLONE_OFFLINK_ROUTE | |
744 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); | |
745 | #else | |
746 | goto out2; | |
747 | #endif | |
748 | } | |
1da177e4 | 749 | |
519fbd87 YH |
750 | dst_release(&rt->u.dst); |
751 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 752 | |
519fbd87 YH |
753 | dst_hold(&rt->u.dst); |
754 | if (nrt) { | |
755 | err = ip6_ins_rt(nrt, NULL, NULL, NULL); | |
756 | if (!err) | |
1da177e4 | 757 | goto out2; |
1da177e4 | 758 | } |
e40cf353 | 759 | |
519fbd87 YH |
760 | if (--attempts <= 0) |
761 | goto out2; | |
762 | ||
763 | /* | |
c71099ac | 764 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
765 | * released someone could insert this route. Relookup. |
766 | */ | |
767 | dst_release(&rt->u.dst); | |
768 | goto relookup; | |
769 | ||
770 | out: | |
8238dd06 YH |
771 | if (reachable) { |
772 | reachable = 0; | |
773 | goto restart_2; | |
774 | } | |
519fbd87 | 775 | dst_hold(&rt->u.dst); |
c71099ac | 776 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
777 | out2: |
778 | rt->u.dst.lastuse = jiffies; | |
779 | rt->u.dst.__use++; | |
c71099ac TG |
780 | return rt; |
781 | } | |
782 | ||
783 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
784 | { | |
785 | int flags = 0; | |
786 | ||
787 | if (rt6_need_strict(&fl->fl6_dst)) | |
788 | flags |= RT6_F_STRICT; | |
789 | ||
790 | return fib6_rule_lookup(fl, flags, ip6_pol_route_output); | |
1da177e4 LT |
791 | } |
792 | ||
793 | ||
794 | /* | |
795 | * Destination cache support functions | |
796 | */ | |
797 | ||
798 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
799 | { | |
800 | struct rt6_info *rt; | |
801 | ||
802 | rt = (struct rt6_info *) dst; | |
803 | ||
804 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
805 | return dst; | |
806 | ||
807 | return NULL; | |
808 | } | |
809 | ||
810 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
811 | { | |
812 | struct rt6_info *rt = (struct rt6_info *) dst; | |
813 | ||
814 | if (rt) { | |
815 | if (rt->rt6i_flags & RTF_CACHE) | |
0d51aa80 | 816 | ip6_del_rt(rt, NULL, NULL, NULL); |
1da177e4 LT |
817 | else |
818 | dst_release(dst); | |
819 | } | |
820 | return NULL; | |
821 | } | |
822 | ||
823 | static void ip6_link_failure(struct sk_buff *skb) | |
824 | { | |
825 | struct rt6_info *rt; | |
826 | ||
827 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
828 | ||
829 | rt = (struct rt6_info *) skb->dst; | |
830 | if (rt) { | |
831 | if (rt->rt6i_flags&RTF_CACHE) { | |
832 | dst_set_expires(&rt->u.dst, 0); | |
833 | rt->rt6i_flags |= RTF_EXPIRES; | |
834 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
835 | rt->rt6i_node->fn_sernum = -1; | |
836 | } | |
837 | } | |
838 | ||
839 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
840 | { | |
841 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
842 | ||
843 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
844 | rt6->rt6i_flags |= RTF_MODIFIED; | |
845 | if (mtu < IPV6_MIN_MTU) { | |
846 | mtu = IPV6_MIN_MTU; | |
847 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
848 | } | |
849 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 850 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
851 | } |
852 | } | |
853 | ||
1da177e4 LT |
854 | static int ipv6_get_mtu(struct net_device *dev); |
855 | ||
856 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
857 | { | |
858 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
859 | ||
860 | if (mtu < ip6_rt_min_advmss) | |
861 | mtu = ip6_rt_min_advmss; | |
862 | ||
863 | /* | |
864 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and | |
865 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
866 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
867 | * rely only on pmtu discovery" | |
868 | */ | |
869 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
870 | mtu = IPV6_MAXPLEN; | |
871 | return mtu; | |
872 | } | |
873 | ||
5d0bbeeb TG |
874 | static struct dst_entry *ndisc_dst_gc_list; |
875 | DEFINE_SPINLOCK(ndisc_lock); | |
876 | ||
1da177e4 LT |
877 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, |
878 | struct neighbour *neigh, | |
879 | struct in6_addr *addr, | |
880 | int (*output)(struct sk_buff *)) | |
881 | { | |
882 | struct rt6_info *rt; | |
883 | struct inet6_dev *idev = in6_dev_get(dev); | |
884 | ||
885 | if (unlikely(idev == NULL)) | |
886 | return NULL; | |
887 | ||
888 | rt = ip6_dst_alloc(); | |
889 | if (unlikely(rt == NULL)) { | |
890 | in6_dev_put(idev); | |
891 | goto out; | |
892 | } | |
893 | ||
894 | dev_hold(dev); | |
895 | if (neigh) | |
896 | neigh_hold(neigh); | |
897 | else | |
898 | neigh = ndisc_get_neigh(dev, addr); | |
899 | ||
900 | rt->rt6i_dev = dev; | |
901 | rt->rt6i_idev = idev; | |
902 | rt->rt6i_nexthop = neigh; | |
903 | atomic_set(&rt->u.dst.__refcnt, 1); | |
904 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
905 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
906 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
907 | rt->u.dst.output = output; | |
908 | ||
909 | #if 0 /* there's no chance to use these for ndisc */ | |
910 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST | |
911 | ? DST_HOST | |
912 | : 0; | |
913 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
914 | rt->rt6i_dst.plen = 128; | |
915 | #endif | |
916 | ||
5d0bbeeb | 917 | spin_lock_bh(&ndisc_lock); |
1da177e4 LT |
918 | rt->u.dst.next = ndisc_dst_gc_list; |
919 | ndisc_dst_gc_list = &rt->u.dst; | |
5d0bbeeb | 920 | spin_unlock_bh(&ndisc_lock); |
1da177e4 LT |
921 | |
922 | fib6_force_start_gc(); | |
923 | ||
924 | out: | |
925 | return (struct dst_entry *)rt; | |
926 | } | |
927 | ||
928 | int ndisc_dst_gc(int *more) | |
929 | { | |
930 | struct dst_entry *dst, *next, **pprev; | |
931 | int freed; | |
932 | ||
933 | next = NULL; | |
5d0bbeeb TG |
934 | freed = 0; |
935 | ||
936 | spin_lock_bh(&ndisc_lock); | |
1da177e4 | 937 | pprev = &ndisc_dst_gc_list; |
5d0bbeeb | 938 | |
1da177e4 LT |
939 | while ((dst = *pprev) != NULL) { |
940 | if (!atomic_read(&dst->__refcnt)) { | |
941 | *pprev = dst->next; | |
942 | dst_free(dst); | |
943 | freed++; | |
944 | } else { | |
945 | pprev = &dst->next; | |
946 | (*more)++; | |
947 | } | |
948 | } | |
949 | ||
5d0bbeeb TG |
950 | spin_unlock_bh(&ndisc_lock); |
951 | ||
1da177e4 LT |
952 | return freed; |
953 | } | |
954 | ||
955 | static int ip6_dst_gc(void) | |
956 | { | |
957 | static unsigned expire = 30*HZ; | |
958 | static unsigned long last_gc; | |
959 | unsigned long now = jiffies; | |
960 | ||
961 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && | |
962 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) | |
963 | goto out; | |
964 | ||
965 | expire++; | |
966 | fib6_run_gc(expire); | |
967 | last_gc = now; | |
968 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
969 | expire = ip6_rt_gc_timeout>>1; | |
970 | ||
971 | out: | |
972 | expire -= expire>>ip6_rt_gc_elasticity; | |
973 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); | |
974 | } | |
975 | ||
976 | /* Clean host part of a prefix. Not necessary in radix tree, | |
977 | but results in cleaner routing tables. | |
978 | ||
979 | Remove it only when all the things will work! | |
980 | */ | |
981 | ||
982 | static int ipv6_get_mtu(struct net_device *dev) | |
983 | { | |
984 | int mtu = IPV6_MIN_MTU; | |
985 | struct inet6_dev *idev; | |
986 | ||
987 | idev = in6_dev_get(dev); | |
988 | if (idev) { | |
989 | mtu = idev->cnf.mtu6; | |
990 | in6_dev_put(idev); | |
991 | } | |
992 | return mtu; | |
993 | } | |
994 | ||
995 | int ipv6_get_hoplimit(struct net_device *dev) | |
996 | { | |
997 | int hoplimit = ipv6_devconf.hop_limit; | |
998 | struct inet6_dev *idev; | |
999 | ||
1000 | idev = in6_dev_get(dev); | |
1001 | if (idev) { | |
1002 | hoplimit = idev->cnf.hop_limit; | |
1003 | in6_dev_put(idev); | |
1004 | } | |
1005 | return hoplimit; | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * | |
1010 | */ | |
1011 | ||
0d51aa80 | 1012 | int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, |
c71099ac TG |
1013 | void *_rtattr, struct netlink_skb_parms *req, |
1014 | u32 table_id) | |
1da177e4 LT |
1015 | { |
1016 | int err; | |
1017 | struct rtmsg *r; | |
1018 | struct rtattr **rta; | |
1019 | struct rt6_info *rt = NULL; | |
1020 | struct net_device *dev = NULL; | |
1021 | struct inet6_dev *idev = NULL; | |
c71099ac | 1022 | struct fib6_table *table; |
1da177e4 LT |
1023 | int addr_type; |
1024 | ||
1025 | rta = (struct rtattr **) _rtattr; | |
1026 | ||
1027 | if (rtmsg->rtmsg_dst_len > 128 || rtmsg->rtmsg_src_len > 128) | |
1028 | return -EINVAL; | |
1029 | #ifndef CONFIG_IPV6_SUBTREES | |
1030 | if (rtmsg->rtmsg_src_len) | |
1031 | return -EINVAL; | |
1032 | #endif | |
1033 | if (rtmsg->rtmsg_ifindex) { | |
1034 | err = -ENODEV; | |
1035 | dev = dev_get_by_index(rtmsg->rtmsg_ifindex); | |
1036 | if (!dev) | |
1037 | goto out; | |
1038 | idev = in6_dev_get(dev); | |
1039 | if (!idev) | |
1040 | goto out; | |
1041 | } | |
1042 | ||
1043 | if (rtmsg->rtmsg_metric == 0) | |
1044 | rtmsg->rtmsg_metric = IP6_RT_PRIO_USER; | |
1045 | ||
c71099ac TG |
1046 | table = fib6_new_table(table_id); |
1047 | if (table == NULL) { | |
1048 | err = -ENOBUFS; | |
1049 | goto out; | |
1050 | } | |
1051 | ||
1da177e4 LT |
1052 | rt = ip6_dst_alloc(); |
1053 | ||
1054 | if (rt == NULL) { | |
1055 | err = -ENOMEM; | |
1056 | goto out; | |
1057 | } | |
1058 | ||
1059 | rt->u.dst.obsolete = -1; | |
3dd4bc68 | 1060 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(rtmsg->rtmsg_info); |
1da177e4 LT |
1061 | if (nlh && (r = NLMSG_DATA(nlh))) { |
1062 | rt->rt6i_protocol = r->rtm_protocol; | |
1063 | } else { | |
1064 | rt->rt6i_protocol = RTPROT_BOOT; | |
1065 | } | |
1066 | ||
1067 | addr_type = ipv6_addr_type(&rtmsg->rtmsg_dst); | |
1068 | ||
1069 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1070 | rt->u.dst.input = ip6_mc_input; | |
1071 | else | |
1072 | rt->u.dst.input = ip6_forward; | |
1073 | ||
1074 | rt->u.dst.output = ip6_output; | |
1075 | ||
1076 | ipv6_addr_prefix(&rt->rt6i_dst.addr, | |
1077 | &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len); | |
1078 | rt->rt6i_dst.plen = rtmsg->rtmsg_dst_len; | |
1079 | if (rt->rt6i_dst.plen == 128) | |
1080 | rt->u.dst.flags = DST_HOST; | |
1081 | ||
1082 | #ifdef CONFIG_IPV6_SUBTREES | |
1083 | ipv6_addr_prefix(&rt->rt6i_src.addr, | |
1084 | &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len); | |
1085 | rt->rt6i_src.plen = rtmsg->rtmsg_src_len; | |
1086 | #endif | |
1087 | ||
1088 | rt->rt6i_metric = rtmsg->rtmsg_metric; | |
1089 | ||
1090 | /* We cannot add true routes via loopback here, | |
1091 | they would result in kernel looping; promote them to reject routes | |
1092 | */ | |
1093 | if ((rtmsg->rtmsg_flags&RTF_REJECT) || | |
1094 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { | |
1095 | /* hold loopback dev/idev if we haven't done so. */ | |
1096 | if (dev != &loopback_dev) { | |
1097 | if (dev) { | |
1098 | dev_put(dev); | |
1099 | in6_dev_put(idev); | |
1100 | } | |
1101 | dev = &loopback_dev; | |
1102 | dev_hold(dev); | |
1103 | idev = in6_dev_get(dev); | |
1104 | if (!idev) { | |
1105 | err = -ENODEV; | |
1106 | goto out; | |
1107 | } | |
1108 | } | |
1109 | rt->u.dst.output = ip6_pkt_discard_out; | |
1110 | rt->u.dst.input = ip6_pkt_discard; | |
1111 | rt->u.dst.error = -ENETUNREACH; | |
1112 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1113 | goto install_route; | |
1114 | } | |
1115 | ||
1116 | if (rtmsg->rtmsg_flags & RTF_GATEWAY) { | |
1117 | struct in6_addr *gw_addr; | |
1118 | int gwa_type; | |
1119 | ||
1120 | gw_addr = &rtmsg->rtmsg_gateway; | |
1121 | ipv6_addr_copy(&rt->rt6i_gateway, &rtmsg->rtmsg_gateway); | |
1122 | gwa_type = ipv6_addr_type(gw_addr); | |
1123 | ||
1124 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1125 | struct rt6_info *grt; | |
1126 | ||
1127 | /* IPv6 strictly inhibits using not link-local | |
1128 | addresses as nexthop address. | |
1129 | Otherwise, router will not able to send redirects. | |
1130 | It is very good, but in some (rare!) circumstances | |
1131 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1132 | some exceptions. --ANK | |
1133 | */ | |
1134 | err = -EINVAL; | |
1135 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1136 | goto out; | |
1137 | ||
1138 | grt = rt6_lookup(gw_addr, NULL, rtmsg->rtmsg_ifindex, 1); | |
1139 | ||
1140 | err = -EHOSTUNREACH; | |
1141 | if (grt == NULL) | |
1142 | goto out; | |
1143 | if (dev) { | |
1144 | if (dev != grt->rt6i_dev) { | |
1145 | dst_release(&grt->u.dst); | |
1146 | goto out; | |
1147 | } | |
1148 | } else { | |
1149 | dev = grt->rt6i_dev; | |
1150 | idev = grt->rt6i_idev; | |
1151 | dev_hold(dev); | |
1152 | in6_dev_hold(grt->rt6i_idev); | |
1153 | } | |
1154 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1155 | err = 0; | |
1156 | dst_release(&grt->u.dst); | |
1157 | ||
1158 | if (err) | |
1159 | goto out; | |
1160 | } | |
1161 | err = -EINVAL; | |
1162 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1163 | goto out; | |
1164 | } | |
1165 | ||
1166 | err = -ENODEV; | |
1167 | if (dev == NULL) | |
1168 | goto out; | |
1169 | ||
1170 | if (rtmsg->rtmsg_flags & (RTF_GATEWAY|RTF_NONEXTHOP)) { | |
1171 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); | |
1172 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1173 | err = PTR_ERR(rt->rt6i_nexthop); | |
1174 | rt->rt6i_nexthop = NULL; | |
1175 | goto out; | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | rt->rt6i_flags = rtmsg->rtmsg_flags; | |
1180 | ||
1181 | install_route: | |
1182 | if (rta && rta[RTA_METRICS-1]) { | |
1183 | int attrlen = RTA_PAYLOAD(rta[RTA_METRICS-1]); | |
1184 | struct rtattr *attr = RTA_DATA(rta[RTA_METRICS-1]); | |
1185 | ||
1186 | while (RTA_OK(attr, attrlen)) { | |
1187 | unsigned flavor = attr->rta_type; | |
1188 | if (flavor) { | |
1189 | if (flavor > RTAX_MAX) { | |
1190 | err = -EINVAL; | |
1191 | goto out; | |
1192 | } | |
1193 | rt->u.dst.metrics[flavor-1] = | |
1194 | *(u32 *)RTA_DATA(attr); | |
1195 | } | |
1196 | attr = RTA_NEXT(attr, attrlen); | |
1197 | } | |
1198 | } | |
1199 | ||
1200 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1201 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1202 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1203 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1204 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1205 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1206 | rt->u.dst.dev = dev; | |
1207 | rt->rt6i_idev = idev; | |
c71099ac | 1208 | rt->rt6i_table = table; |
0d51aa80 | 1209 | return ip6_ins_rt(rt, nlh, _rtattr, req); |
1da177e4 LT |
1210 | |
1211 | out: | |
1212 | if (dev) | |
1213 | dev_put(dev); | |
1214 | if (idev) | |
1215 | in6_dev_put(idev); | |
1216 | if (rt) | |
1217 | dst_free((struct dst_entry *) rt); | |
1218 | return err; | |
1219 | } | |
1220 | ||
0d51aa80 | 1221 | int ip6_del_rt(struct rt6_info *rt, struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req) |
1da177e4 LT |
1222 | { |
1223 | int err; | |
c71099ac | 1224 | struct fib6_table *table; |
1da177e4 | 1225 | |
6c813a72 PM |
1226 | if (rt == &ip6_null_entry) |
1227 | return -ENOENT; | |
1228 | ||
c71099ac TG |
1229 | table = rt->rt6i_table; |
1230 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1231 | |
0d51aa80 | 1232 | err = fib6_del(rt, nlh, _rtattr, req); |
1da177e4 LT |
1233 | dst_release(&rt->u.dst); |
1234 | ||
c71099ac | 1235 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1236 | |
1237 | return err; | |
1238 | } | |
1239 | ||
c71099ac TG |
1240 | static int ip6_route_del(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, |
1241 | void *_rtattr, struct netlink_skb_parms *req, | |
1242 | u32 table_id) | |
1da177e4 | 1243 | { |
c71099ac | 1244 | struct fib6_table *table; |
1da177e4 LT |
1245 | struct fib6_node *fn; |
1246 | struct rt6_info *rt; | |
1247 | int err = -ESRCH; | |
1248 | ||
c71099ac TG |
1249 | table = fib6_get_table(table_id); |
1250 | if (table == NULL) | |
1251 | return err; | |
1252 | ||
1253 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1254 | |
c71099ac | 1255 | fn = fib6_locate(&table->tb6_root, |
1da177e4 LT |
1256 | &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len, |
1257 | &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len); | |
1258 | ||
1259 | if (fn) { | |
1260 | for (rt = fn->leaf; rt; rt = rt->u.next) { | |
1261 | if (rtmsg->rtmsg_ifindex && | |
1262 | (rt->rt6i_dev == NULL || | |
1263 | rt->rt6i_dev->ifindex != rtmsg->rtmsg_ifindex)) | |
1264 | continue; | |
1265 | if (rtmsg->rtmsg_flags&RTF_GATEWAY && | |
1266 | !ipv6_addr_equal(&rtmsg->rtmsg_gateway, &rt->rt6i_gateway)) | |
1267 | continue; | |
1268 | if (rtmsg->rtmsg_metric && | |
1269 | rtmsg->rtmsg_metric != rt->rt6i_metric) | |
1270 | continue; | |
1271 | dst_hold(&rt->u.dst); | |
c71099ac | 1272 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1273 | |
0d51aa80 | 1274 | return ip6_del_rt(rt, nlh, _rtattr, req); |
1da177e4 LT |
1275 | } |
1276 | } | |
c71099ac | 1277 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1278 | |
1279 | return err; | |
1280 | } | |
1281 | ||
1282 | /* | |
1283 | * Handle redirects | |
1284 | */ | |
1285 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *saddr, | |
1286 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1287 | { | |
e843b9e1 | 1288 | struct rt6_info *rt, *nrt = NULL; |
e843b9e1 | 1289 | struct fib6_node *fn; |
c71099ac | 1290 | struct fib6_table *table; |
8d71740c | 1291 | struct netevent_redirect netevent; |
1da177e4 | 1292 | |
c71099ac TG |
1293 | /* TODO: Very lazy, might need to check all tables */ |
1294 | table = fib6_get_table(RT6_TABLE_MAIN); | |
1295 | if (table == NULL) | |
1296 | return; | |
1297 | ||
1da177e4 | 1298 | /* |
e843b9e1 YH |
1299 | * Get the "current" route for this destination and |
1300 | * check if the redirect has come from approriate router. | |
1301 | * | |
1302 | * RFC 2461 specifies that redirects should only be | |
1303 | * accepted if they come from the nexthop to the target. | |
1304 | * Due to the way the routes are chosen, this notion | |
1305 | * is a bit fuzzy and one might need to check all possible | |
1306 | * routes. | |
1da177e4 | 1307 | */ |
1da177e4 | 1308 | |
c71099ac TG |
1309 | read_lock_bh(&table->tb6_lock); |
1310 | fn = fib6_lookup(&table->tb6_root, dest, NULL); | |
e843b9e1 YH |
1311 | restart: |
1312 | for (rt = fn->leaf; rt; rt = rt->u.next) { | |
1313 | /* | |
1314 | * Current route is on-link; redirect is always invalid. | |
1315 | * | |
1316 | * Seems, previous statement is not true. It could | |
1317 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1318 | * But then router serving it might decide, that we should | |
1319 | * know truth 8)8) --ANK (980726). | |
1320 | */ | |
1321 | if (rt6_check_expired(rt)) | |
1322 | continue; | |
1323 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1324 | continue; | |
1325 | if (neigh->dev != rt->rt6i_dev) | |
1326 | continue; | |
1327 | if (!ipv6_addr_equal(saddr, &rt->rt6i_gateway)) | |
1328 | continue; | |
1329 | break; | |
1330 | } | |
1331 | if (rt) | |
1332 | dst_hold(&rt->u.dst); | |
c71099ac | 1333 | else if (rt6_need_strict(dest)) { |
e843b9e1 YH |
1334 | while ((fn = fn->parent) != NULL) { |
1335 | if (fn->fn_flags & RTN_ROOT) | |
1336 | break; | |
1337 | if (fn->fn_flags & RTN_RTINFO) | |
1338 | goto restart; | |
1da177e4 | 1339 | } |
e843b9e1 | 1340 | } |
c71099ac | 1341 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 YH |
1342 | |
1343 | if (!rt) { | |
1da177e4 LT |
1344 | if (net_ratelimit()) |
1345 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1346 | "for redirect target\n"); | |
e843b9e1 | 1347 | return; |
1da177e4 LT |
1348 | } |
1349 | ||
1da177e4 LT |
1350 | /* |
1351 | * We have finally decided to accept it. | |
1352 | */ | |
1353 | ||
1354 | neigh_update(neigh, lladdr, NUD_STALE, | |
1355 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1356 | NEIGH_UPDATE_F_OVERRIDE| | |
1357 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1358 | NEIGH_UPDATE_F_ISROUTER)) | |
1359 | ); | |
1360 | ||
1361 | /* | |
1362 | * Redirect received -> path was valid. | |
1363 | * Look, redirects are sent only in response to data packets, | |
1364 | * so that this nexthop apparently is reachable. --ANK | |
1365 | */ | |
1366 | dst_confirm(&rt->u.dst); | |
1367 | ||
1368 | /* Duplicate redirect: silently ignore. */ | |
1369 | if (neigh == rt->u.dst.neighbour) | |
1370 | goto out; | |
1371 | ||
1372 | nrt = ip6_rt_copy(rt); | |
1373 | if (nrt == NULL) | |
1374 | goto out; | |
1375 | ||
1376 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1377 | if (on_link) | |
1378 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1379 | ||
1380 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1381 | nrt->rt6i_dst.plen = 128; | |
1382 | nrt->u.dst.flags |= DST_HOST; | |
1383 | ||
1384 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1385 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1386 | /* Reset pmtu, it may be better */ | |
1387 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1388 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1389 | ||
0d51aa80 | 1390 | if (ip6_ins_rt(nrt, NULL, NULL, NULL)) |
1da177e4 LT |
1391 | goto out; |
1392 | ||
8d71740c TT |
1393 | netevent.old = &rt->u.dst; |
1394 | netevent.new = &nrt->u.dst; | |
1395 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1396 | ||
1da177e4 | 1397 | if (rt->rt6i_flags&RTF_CACHE) { |
0d51aa80 | 1398 | ip6_del_rt(rt, NULL, NULL, NULL); |
1da177e4 LT |
1399 | return; |
1400 | } | |
1401 | ||
1402 | out: | |
1403 | dst_release(&rt->u.dst); | |
1404 | return; | |
1405 | } | |
1406 | ||
1407 | /* | |
1408 | * Handle ICMP "packet too big" messages | |
1409 | * i.e. Path MTU discovery | |
1410 | */ | |
1411 | ||
1412 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1413 | struct net_device *dev, u32 pmtu) | |
1414 | { | |
1415 | struct rt6_info *rt, *nrt; | |
1416 | int allfrag = 0; | |
1417 | ||
1418 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1419 | if (rt == NULL) | |
1420 | return; | |
1421 | ||
1422 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1423 | goto out; | |
1424 | ||
1425 | if (pmtu < IPV6_MIN_MTU) { | |
1426 | /* | |
1427 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link | |
1428 | * MTU (1280) and a fragment header should always be included | |
1429 | * after a node receiving Too Big message reporting PMTU is | |
1430 | * less than the IPv6 Minimum Link MTU. | |
1431 | */ | |
1432 | pmtu = IPV6_MIN_MTU; | |
1433 | allfrag = 1; | |
1434 | } | |
1435 | ||
1436 | /* New mtu received -> path was valid. | |
1437 | They are sent only in response to data packets, | |
1438 | so that this nexthop apparently is reachable. --ANK | |
1439 | */ | |
1440 | dst_confirm(&rt->u.dst); | |
1441 | ||
1442 | /* Host route. If it is static, it would be better | |
1443 | not to override it, but add new one, so that | |
1444 | when cache entry will expire old pmtu | |
1445 | would return automatically. | |
1446 | */ | |
1447 | if (rt->rt6i_flags & RTF_CACHE) { | |
1448 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1449 | if (allfrag) | |
1450 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1451 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); | |
1452 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; | |
1453 | goto out; | |
1454 | } | |
1455 | ||
1456 | /* Network route. | |
1457 | Two cases are possible: | |
1458 | 1. It is connected route. Action: COW | |
1459 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1460 | */ | |
d5315b50 | 1461 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1462 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1463 | else |
1464 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1465 | |
d5315b50 | 1466 | if (nrt) { |
a1e78363 YH |
1467 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1468 | if (allfrag) | |
1469 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1470 | ||
1471 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1472 | * happened within 5 mins, the recommended timer is 10 mins. | |
1473 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1474 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1475 | * and detecting PMTU increase will be automatically happened. | |
1476 | */ | |
1477 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); | |
1478 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; | |
1479 | ||
1480 | ip6_ins_rt(nrt, NULL, NULL, NULL); | |
1da177e4 | 1481 | } |
1da177e4 LT |
1482 | out: |
1483 | dst_release(&rt->u.dst); | |
1484 | } | |
1485 | ||
1486 | /* | |
1487 | * Misc support functions | |
1488 | */ | |
1489 | ||
1490 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1491 | { | |
1492 | struct rt6_info *rt = ip6_dst_alloc(); | |
1493 | ||
1494 | if (rt) { | |
1495 | rt->u.dst.input = ort->u.dst.input; | |
1496 | rt->u.dst.output = ort->u.dst.output; | |
1497 | ||
1498 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
1499 | rt->u.dst.dev = ort->u.dst.dev; | |
1500 | if (rt->u.dst.dev) | |
1501 | dev_hold(rt->u.dst.dev); | |
1502 | rt->rt6i_idev = ort->rt6i_idev; | |
1503 | if (rt->rt6i_idev) | |
1504 | in6_dev_hold(rt->rt6i_idev); | |
1505 | rt->u.dst.lastuse = jiffies; | |
1506 | rt->rt6i_expires = 0; | |
1507 | ||
1508 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1509 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1510 | rt->rt6i_metric = 0; | |
1511 | ||
1512 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1513 | #ifdef CONFIG_IPV6_SUBTREES | |
1514 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1515 | #endif | |
c71099ac | 1516 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1517 | } |
1518 | return rt; | |
1519 | } | |
1520 | ||
70ceb4f5 YH |
1521 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1522 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1523 | struct in6_addr *gwaddr, int ifindex) | |
1524 | { | |
1525 | struct fib6_node *fn; | |
1526 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1527 | struct fib6_table *table; |
1528 | ||
1529 | table = fib6_get_table(RT6_TABLE_INFO); | |
1530 | if (table == NULL) | |
1531 | return NULL; | |
70ceb4f5 | 1532 | |
c71099ac TG |
1533 | write_lock_bh(&table->tb6_lock); |
1534 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1535 | if (!fn) |
1536 | goto out; | |
1537 | ||
1538 | for (rt = fn->leaf; rt; rt = rt->u.next) { | |
1539 | if (rt->rt6i_dev->ifindex != ifindex) | |
1540 | continue; | |
1541 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1542 | continue; | |
1543 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1544 | continue; | |
1545 | dst_hold(&rt->u.dst); | |
1546 | break; | |
1547 | } | |
1548 | out: | |
c71099ac | 1549 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1550 | return rt; |
1551 | } | |
1552 | ||
1553 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1554 | struct in6_addr *gwaddr, int ifindex, | |
1555 | unsigned pref) | |
1556 | { | |
1557 | struct in6_rtmsg rtmsg; | |
1558 | ||
1559 | memset(&rtmsg, 0, sizeof(rtmsg)); | |
1560 | rtmsg.rtmsg_type = RTMSG_NEWROUTE; | |
1561 | ipv6_addr_copy(&rtmsg.rtmsg_dst, prefix); | |
1562 | rtmsg.rtmsg_dst_len = prefixlen; | |
1563 | ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr); | |
1564 | rtmsg.rtmsg_metric = 1024; | |
1565 | rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | RTF_UP | RTF_PREF(pref); | |
e317da96 YH |
1566 | /* We should treat it as a default route if prefix length is 0. */ |
1567 | if (!prefixlen) | |
1568 | rtmsg.rtmsg_flags |= RTF_DEFAULT; | |
70ceb4f5 YH |
1569 | rtmsg.rtmsg_ifindex = ifindex; |
1570 | ||
c71099ac | 1571 | ip6_route_add(&rtmsg, NULL, NULL, NULL, RT6_TABLE_INFO); |
70ceb4f5 YH |
1572 | |
1573 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1574 | } | |
1575 | #endif | |
1576 | ||
1da177e4 LT |
1577 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1578 | { | |
1579 | struct rt6_info *rt; | |
c71099ac | 1580 | struct fib6_table *table; |
1da177e4 | 1581 | |
c71099ac TG |
1582 | table = fib6_get_table(RT6_TABLE_DFLT); |
1583 | if (table == NULL) | |
1584 | return NULL; | |
1da177e4 | 1585 | |
c71099ac TG |
1586 | write_lock_bh(&table->tb6_lock); |
1587 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.next) { | |
1da177e4 | 1588 | if (dev == rt->rt6i_dev && |
045927ff | 1589 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1590 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1591 | break; | |
1592 | } | |
1593 | if (rt) | |
1594 | dst_hold(&rt->u.dst); | |
c71099ac | 1595 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1596 | return rt; |
1597 | } | |
1598 | ||
1599 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1600 | struct net_device *dev, |
1601 | unsigned int pref) | |
1da177e4 LT |
1602 | { |
1603 | struct in6_rtmsg rtmsg; | |
1604 | ||
1605 | memset(&rtmsg, 0, sizeof(struct in6_rtmsg)); | |
1606 | rtmsg.rtmsg_type = RTMSG_NEWROUTE; | |
1607 | ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr); | |
1608 | rtmsg.rtmsg_metric = 1024; | |
ebacaaa0 YH |
1609 | rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | RTF_UP | RTF_EXPIRES | |
1610 | RTF_PREF(pref); | |
1da177e4 LT |
1611 | |
1612 | rtmsg.rtmsg_ifindex = dev->ifindex; | |
1613 | ||
c71099ac | 1614 | ip6_route_add(&rtmsg, NULL, NULL, NULL, RT6_TABLE_DFLT); |
1da177e4 LT |
1615 | return rt6_get_dflt_router(gwaddr, dev); |
1616 | } | |
1617 | ||
1618 | void rt6_purge_dflt_routers(void) | |
1619 | { | |
1620 | struct rt6_info *rt; | |
c71099ac TG |
1621 | struct fib6_table *table; |
1622 | ||
1623 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
1624 | table = fib6_get_table(RT6_TABLE_DFLT); | |
1625 | if (table == NULL) | |
1626 | return; | |
1da177e4 LT |
1627 | |
1628 | restart: | |
c71099ac TG |
1629 | read_lock_bh(&table->tb6_lock); |
1630 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.next) { | |
1da177e4 LT |
1631 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1632 | dst_hold(&rt->u.dst); | |
c71099ac | 1633 | read_unlock_bh(&table->tb6_lock); |
0d51aa80 | 1634 | ip6_del_rt(rt, NULL, NULL, NULL); |
1da177e4 LT |
1635 | goto restart; |
1636 | } | |
1637 | } | |
c71099ac | 1638 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1639 | } |
1640 | ||
1641 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) | |
1642 | { | |
1643 | struct in6_rtmsg rtmsg; | |
1644 | int err; | |
1645 | ||
1646 | switch(cmd) { | |
1647 | case SIOCADDRT: /* Add a route */ | |
1648 | case SIOCDELRT: /* Delete a route */ | |
1649 | if (!capable(CAP_NET_ADMIN)) | |
1650 | return -EPERM; | |
1651 | err = copy_from_user(&rtmsg, arg, | |
1652 | sizeof(struct in6_rtmsg)); | |
1653 | if (err) | |
1654 | return -EFAULT; | |
1655 | ||
1656 | rtnl_lock(); | |
1657 | switch (cmd) { | |
1658 | case SIOCADDRT: | |
c71099ac TG |
1659 | err = ip6_route_add(&rtmsg, NULL, NULL, NULL, |
1660 | RT6_TABLE_MAIN); | |
1da177e4 LT |
1661 | break; |
1662 | case SIOCDELRT: | |
c71099ac TG |
1663 | err = ip6_route_del(&rtmsg, NULL, NULL, NULL, |
1664 | RT6_TABLE_MAIN); | |
1da177e4 LT |
1665 | break; |
1666 | default: | |
1667 | err = -EINVAL; | |
1668 | } | |
1669 | rtnl_unlock(); | |
1670 | ||
1671 | return err; | |
1672 | }; | |
1673 | ||
1674 | return -EINVAL; | |
1675 | } | |
1676 | ||
1677 | /* | |
1678 | * Drop the packet on the floor | |
1679 | */ | |
1680 | ||
20380731 | 1681 | static int ip6_pkt_discard(struct sk_buff *skb) |
1da177e4 | 1682 | { |
76d0cc1b LL |
1683 | int type = ipv6_addr_type(&skb->nh.ipv6h->daddr); |
1684 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) | |
1685 | IP6_INC_STATS(IPSTATS_MIB_INADDRERRORS); | |
1686 | ||
1da177e4 LT |
1687 | IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES); |
1688 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev); | |
1689 | kfree_skb(skb); | |
1690 | return 0; | |
1691 | } | |
1692 | ||
20380731 | 1693 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1694 | { |
1695 | skb->dev = skb->dst->dev; | |
1696 | return ip6_pkt_discard(skb); | |
1697 | } | |
1698 | ||
1699 | /* | |
1700 | * Allocate a dst for local (unicast / anycast) address. | |
1701 | */ | |
1702 | ||
1703 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1704 | const struct in6_addr *addr, | |
1705 | int anycast) | |
1706 | { | |
1707 | struct rt6_info *rt = ip6_dst_alloc(); | |
1708 | ||
1709 | if (rt == NULL) | |
1710 | return ERR_PTR(-ENOMEM); | |
1711 | ||
1712 | dev_hold(&loopback_dev); | |
1713 | in6_dev_hold(idev); | |
1714 | ||
1715 | rt->u.dst.flags = DST_HOST; | |
1716 | rt->u.dst.input = ip6_input; | |
1717 | rt->u.dst.output = ip6_output; | |
1718 | rt->rt6i_dev = &loopback_dev; | |
1719 | rt->rt6i_idev = idev; | |
1720 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1721 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1722 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1723 | rt->u.dst.obsolete = -1; | |
1724 | ||
1725 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1726 | if (anycast) |
1727 | rt->rt6i_flags |= RTF_ANYCAST; | |
1728 | else | |
1da177e4 LT |
1729 | rt->rt6i_flags |= RTF_LOCAL; |
1730 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1731 | if (rt->rt6i_nexthop == NULL) { | |
1732 | dst_free((struct dst_entry *) rt); | |
1733 | return ERR_PTR(-ENOMEM); | |
1734 | } | |
1735 | ||
1736 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1737 | rt->rt6i_dst.plen = 128; | |
c71099ac | 1738 | rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL); |
1da177e4 LT |
1739 | |
1740 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1741 | ||
1742 | return rt; | |
1743 | } | |
1744 | ||
1745 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1746 | { | |
1747 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1748 | rt != &ip6_null_entry) { | |
1749 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1750 | return -1; | |
1751 | } | |
1752 | return 0; | |
1753 | } | |
1754 | ||
1755 | void rt6_ifdown(struct net_device *dev) | |
1756 | { | |
c71099ac | 1757 | fib6_clean_all(fib6_ifdown, 0, dev); |
1da177e4 LT |
1758 | } |
1759 | ||
1760 | struct rt6_mtu_change_arg | |
1761 | { | |
1762 | struct net_device *dev; | |
1763 | unsigned mtu; | |
1764 | }; | |
1765 | ||
1766 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1767 | { | |
1768 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1769 | struct inet6_dev *idev; | |
1770 | ||
1771 | /* In IPv6 pmtu discovery is not optional, | |
1772 | so that RTAX_MTU lock cannot disable it. | |
1773 | We still use this lock to block changes | |
1774 | caused by addrconf/ndisc. | |
1775 | */ | |
1776 | ||
1777 | idev = __in6_dev_get(arg->dev); | |
1778 | if (idev == NULL) | |
1779 | return 0; | |
1780 | ||
1781 | /* For administrative MTU increase, there is no way to discover | |
1782 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1783 | Since RFC 1981 doesn't include administrative MTU increase | |
1784 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1785 | */ | |
1786 | /* | |
1787 | If new MTU is less than route PMTU, this new MTU will be the | |
1788 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1789 | decreases; if new MTU is greater than route PMTU, and the | |
1790 | old MTU is the lowest MTU in the path, update the route PMTU | |
1791 | to reflect the increase. In this case if the other nodes' MTU | |
1792 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1793 | PMTU discouvery. | |
1794 | */ | |
1795 | if (rt->rt6i_dev == arg->dev && | |
1796 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
1797 | (dst_mtu(&rt->u.dst) > arg->mtu || | |
1798 | (dst_mtu(&rt->u.dst) < arg->mtu && | |
1799 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) | |
1800 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; | |
1801 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); | |
1802 | return 0; | |
1803 | } | |
1804 | ||
1805 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1806 | { | |
c71099ac TG |
1807 | struct rt6_mtu_change_arg arg = { |
1808 | .dev = dev, | |
1809 | .mtu = mtu, | |
1810 | }; | |
1da177e4 | 1811 | |
c71099ac | 1812 | fib6_clean_all(rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1813 | } |
1814 | ||
1815 | static int inet6_rtm_to_rtmsg(struct rtmsg *r, struct rtattr **rta, | |
1816 | struct in6_rtmsg *rtmsg) | |
1817 | { | |
1818 | memset(rtmsg, 0, sizeof(*rtmsg)); | |
1819 | ||
1820 | rtmsg->rtmsg_dst_len = r->rtm_dst_len; | |
1821 | rtmsg->rtmsg_src_len = r->rtm_src_len; | |
1822 | rtmsg->rtmsg_flags = RTF_UP; | |
1823 | if (r->rtm_type == RTN_UNREACHABLE) | |
1824 | rtmsg->rtmsg_flags |= RTF_REJECT; | |
1825 | ||
1826 | if (rta[RTA_GATEWAY-1]) { | |
1827 | if (rta[RTA_GATEWAY-1]->rta_len != RTA_LENGTH(16)) | |
1828 | return -EINVAL; | |
1829 | memcpy(&rtmsg->rtmsg_gateway, RTA_DATA(rta[RTA_GATEWAY-1]), 16); | |
1830 | rtmsg->rtmsg_flags |= RTF_GATEWAY; | |
1831 | } | |
1832 | if (rta[RTA_DST-1]) { | |
1833 | if (RTA_PAYLOAD(rta[RTA_DST-1]) < ((r->rtm_dst_len+7)>>3)) | |
1834 | return -EINVAL; | |
1835 | memcpy(&rtmsg->rtmsg_dst, RTA_DATA(rta[RTA_DST-1]), ((r->rtm_dst_len+7)>>3)); | |
1836 | } | |
1837 | if (rta[RTA_SRC-1]) { | |
1838 | if (RTA_PAYLOAD(rta[RTA_SRC-1]) < ((r->rtm_src_len+7)>>3)) | |
1839 | return -EINVAL; | |
1840 | memcpy(&rtmsg->rtmsg_src, RTA_DATA(rta[RTA_SRC-1]), ((r->rtm_src_len+7)>>3)); | |
1841 | } | |
1842 | if (rta[RTA_OIF-1]) { | |
1843 | if (rta[RTA_OIF-1]->rta_len != RTA_LENGTH(sizeof(int))) | |
1844 | return -EINVAL; | |
1845 | memcpy(&rtmsg->rtmsg_ifindex, RTA_DATA(rta[RTA_OIF-1]), sizeof(int)); | |
1846 | } | |
1847 | if (rta[RTA_PRIORITY-1]) { | |
1848 | if (rta[RTA_PRIORITY-1]->rta_len != RTA_LENGTH(4)) | |
1849 | return -EINVAL; | |
1850 | memcpy(&rtmsg->rtmsg_metric, RTA_DATA(rta[RTA_PRIORITY-1]), 4); | |
1851 | } | |
1852 | return 0; | |
1853 | } | |
1854 | ||
1855 | int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
1856 | { | |
1857 | struct rtmsg *r = NLMSG_DATA(nlh); | |
1858 | struct in6_rtmsg rtmsg; | |
1859 | ||
1860 | if (inet6_rtm_to_rtmsg(r, arg, &rtmsg)) | |
1861 | return -EINVAL; | |
c71099ac | 1862 | return ip6_route_del(&rtmsg, nlh, arg, &NETLINK_CB(skb), r->rtm_table); |
1da177e4 LT |
1863 | } |
1864 | ||
1865 | int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
1866 | { | |
1867 | struct rtmsg *r = NLMSG_DATA(nlh); | |
1868 | struct in6_rtmsg rtmsg; | |
1869 | ||
1870 | if (inet6_rtm_to_rtmsg(r, arg, &rtmsg)) | |
1871 | return -EINVAL; | |
c71099ac | 1872 | return ip6_route_add(&rtmsg, nlh, arg, &NETLINK_CB(skb), r->rtm_table); |
1da177e4 LT |
1873 | } |
1874 | ||
1875 | struct rt6_rtnl_dump_arg | |
1876 | { | |
1877 | struct sk_buff *skb; | |
1878 | struct netlink_callback *cb; | |
1879 | }; | |
1880 | ||
1881 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
1882 | struct in6_addr *dst, struct in6_addr *src, |
1883 | int iif, int type, u32 pid, u32 seq, | |
1884 | int prefix, unsigned int flags) | |
1da177e4 LT |
1885 | { |
1886 | struct rtmsg *rtm; | |
1887 | struct nlmsghdr *nlh; | |
1888 | unsigned char *b = skb->tail; | |
1889 | struct rta_cacheinfo ci; | |
1890 | ||
1891 | if (prefix) { /* user wants prefix routes only */ | |
1892 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
1893 | /* success since this is not a prefix route */ | |
1894 | return 1; | |
1895 | } | |
1896 | } | |
1897 | ||
b6544c0b | 1898 | nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*rtm), flags); |
1da177e4 LT |
1899 | rtm = NLMSG_DATA(nlh); |
1900 | rtm->rtm_family = AF_INET6; | |
1901 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
1902 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
1903 | rtm->rtm_tos = 0; | |
c71099ac TG |
1904 | if (rt->rt6i_table) |
1905 | rtm->rtm_table = rt->rt6i_table->tb6_id; | |
1906 | else | |
1907 | rtm->rtm_table = RT6_TABLE_UNSPEC; | |
1da177e4 LT |
1908 | if (rt->rt6i_flags&RTF_REJECT) |
1909 | rtm->rtm_type = RTN_UNREACHABLE; | |
1910 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
1911 | rtm->rtm_type = RTN_LOCAL; | |
1912 | else | |
1913 | rtm->rtm_type = RTN_UNICAST; | |
1914 | rtm->rtm_flags = 0; | |
1915 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
1916 | rtm->rtm_protocol = rt->rt6i_protocol; | |
1917 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
1918 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
1919 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
1920 | rtm->rtm_protocol = RTPROT_KERNEL; | |
1921 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
1922 | rtm->rtm_protocol = RTPROT_RA; | |
1923 | ||
1924 | if (rt->rt6i_flags&RTF_CACHE) | |
1925 | rtm->rtm_flags |= RTM_F_CLONED; | |
1926 | ||
1927 | if (dst) { | |
1928 | RTA_PUT(skb, RTA_DST, 16, dst); | |
1929 | rtm->rtm_dst_len = 128; | |
1930 | } else if (rtm->rtm_dst_len) | |
1931 | RTA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); | |
1932 | #ifdef CONFIG_IPV6_SUBTREES | |
1933 | if (src) { | |
1934 | RTA_PUT(skb, RTA_SRC, 16, src); | |
1935 | rtm->rtm_src_len = 128; | |
1936 | } else if (rtm->rtm_src_len) | |
1937 | RTA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); | |
1938 | #endif | |
1939 | if (iif) | |
1940 | RTA_PUT(skb, RTA_IIF, 4, &iif); | |
1941 | else if (dst) { | |
1942 | struct in6_addr saddr_buf; | |
1943 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) | |
1944 | RTA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); | |
1945 | } | |
1946 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) | |
1947 | goto rtattr_failure; | |
1948 | if (rt->u.dst.neighbour) | |
1949 | RTA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); | |
1950 | if (rt->u.dst.dev) | |
1951 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->rt6i_dev->ifindex); | |
1952 | RTA_PUT(skb, RTA_PRIORITY, 4, &rt->rt6i_metric); | |
1953 | ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse); | |
1954 | if (rt->rt6i_expires) | |
1955 | ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies); | |
1956 | else | |
1957 | ci.rta_expires = 0; | |
1958 | ci.rta_used = rt->u.dst.__use; | |
1959 | ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt); | |
1960 | ci.rta_error = rt->u.dst.error; | |
1961 | ci.rta_id = 0; | |
1962 | ci.rta_ts = 0; | |
1963 | ci.rta_tsage = 0; | |
1964 | RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci); | |
1965 | nlh->nlmsg_len = skb->tail - b; | |
1966 | return skb->len; | |
1967 | ||
1968 | nlmsg_failure: | |
1969 | rtattr_failure: | |
1970 | skb_trim(skb, b - skb->data); | |
1971 | return -1; | |
1972 | } | |
1973 | ||
1974 | static int rt6_dump_route(struct rt6_info *rt, void *p_arg) | |
1975 | { | |
1976 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
1977 | int prefix; | |
1978 | ||
1979 | if (arg->cb->nlh->nlmsg_len >= NLMSG_LENGTH(sizeof(struct rtmsg))) { | |
1980 | struct rtmsg *rtm = NLMSG_DATA(arg->cb->nlh); | |
1981 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; | |
1982 | } else | |
1983 | prefix = 0; | |
1984 | ||
1985 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1986 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 1987 | prefix, NLM_F_MULTI); |
1da177e4 LT |
1988 | } |
1989 | ||
1990 | static int fib6_dump_node(struct fib6_walker_t *w) | |
1991 | { | |
1992 | int res; | |
1993 | struct rt6_info *rt; | |
1994 | ||
1995 | for (rt = w->leaf; rt; rt = rt->u.next) { | |
1996 | res = rt6_dump_route(rt, w->args); | |
1997 | if (res < 0) { | |
1998 | /* Frame is full, suspend walking */ | |
1999 | w->leaf = rt; | |
2000 | return 1; | |
2001 | } | |
2002 | BUG_TRAP(res!=0); | |
2003 | } | |
2004 | w->leaf = NULL; | |
2005 | return 0; | |
2006 | } | |
2007 | ||
2008 | static void fib6_dump_end(struct netlink_callback *cb) | |
2009 | { | |
2010 | struct fib6_walker_t *w = (void*)cb->args[0]; | |
2011 | ||
2012 | if (w) { | |
2013 | cb->args[0] = 0; | |
1da177e4 LT |
2014 | kfree(w); |
2015 | } | |
efacfbcb HX |
2016 | cb->done = (void*)cb->args[1]; |
2017 | cb->args[1] = 0; | |
1da177e4 LT |
2018 | } |
2019 | ||
2020 | static int fib6_dump_done(struct netlink_callback *cb) | |
2021 | { | |
2022 | fib6_dump_end(cb); | |
a8f74b22 | 2023 | return cb->done ? cb->done(cb) : 0; |
1da177e4 LT |
2024 | } |
2025 | ||
2026 | int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) | |
2027 | { | |
c71099ac | 2028 | struct fib6_table *table; |
1da177e4 LT |
2029 | struct rt6_rtnl_dump_arg arg; |
2030 | struct fib6_walker_t *w; | |
c71099ac | 2031 | int i, res = 0; |
1da177e4 LT |
2032 | |
2033 | arg.skb = skb; | |
2034 | arg.cb = cb; | |
2035 | ||
c71099ac TG |
2036 | /* |
2037 | * cb->args[0] = pointer to walker structure | |
2038 | * cb->args[1] = saved cb->done() pointer | |
2039 | * cb->args[2] = current table being dumped | |
2040 | */ | |
2041 | ||
1da177e4 LT |
2042 | w = (void*)cb->args[0]; |
2043 | if (w == NULL) { | |
2044 | /* New dump: | |
2045 | * | |
2046 | * 1. hook callback destructor. | |
2047 | */ | |
2048 | cb->args[1] = (long)cb->done; | |
2049 | cb->done = fib6_dump_done; | |
2050 | ||
2051 | /* | |
2052 | * 2. allocate and initialize walker. | |
2053 | */ | |
0c600eda | 2054 | w = kzalloc(sizeof(*w), GFP_ATOMIC); |
1da177e4 LT |
2055 | if (w == NULL) |
2056 | return -ENOMEM; | |
1da177e4 LT |
2057 | w->func = fib6_dump_node; |
2058 | w->args = &arg; | |
2059 | cb->args[0] = (long)w; | |
c71099ac | 2060 | cb->args[2] = FIB6_TABLE_MIN; |
1da177e4 LT |
2061 | } else { |
2062 | w->args = &arg; | |
c71099ac TG |
2063 | i = cb->args[2]; |
2064 | if (i > FIB6_TABLE_MAX) | |
2065 | goto end; | |
2066 | ||
2067 | table = fib6_get_table(i); | |
2068 | if (table != NULL) { | |
2069 | read_lock_bh(&table->tb6_lock); | |
2070 | w->root = &table->tb6_root; | |
2071 | res = fib6_walk_continue(w); | |
2072 | read_unlock_bh(&table->tb6_lock); | |
2073 | if (res != 0) { | |
2074 | if (res < 0) | |
2075 | fib6_walker_unlink(w); | |
2076 | goto end; | |
2077 | } | |
2078 | } | |
2079 | ||
2080 | fib6_walker_unlink(w); | |
2081 | cb->args[2] = ++i; | |
1da177e4 | 2082 | } |
c71099ac TG |
2083 | |
2084 | for (i = cb->args[2]; i <= FIB6_TABLE_MAX; i++) { | |
2085 | table = fib6_get_table(i); | |
2086 | if (table == NULL) | |
2087 | continue; | |
2088 | ||
2089 | read_lock_bh(&table->tb6_lock); | |
2090 | w->root = &table->tb6_root; | |
2091 | res = fib6_walk(w); | |
2092 | read_unlock_bh(&table->tb6_lock); | |
2093 | if (res) | |
2094 | break; | |
2095 | } | |
2096 | end: | |
2097 | cb->args[2] = i; | |
2098 | ||
1da177e4 LT |
2099 | res = res < 0 ? res : skb->len; |
2100 | /* res < 0 is an error. (really, impossible) | |
2101 | res == 0 means that dump is complete, but skb still can contain data. | |
2102 | res > 0 dump is not complete, but frame is full. | |
2103 | */ | |
2104 | /* Destroy walker, if dump of this table is complete. */ | |
2105 | if (res <= 0) | |
2106 | fib6_dump_end(cb); | |
2107 | return res; | |
2108 | } | |
2109 | ||
2110 | int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) | |
2111 | { | |
2112 | struct rtattr **rta = arg; | |
2113 | int iif = 0; | |
2114 | int err = -ENOBUFS; | |
2115 | struct sk_buff *skb; | |
2116 | struct flowi fl; | |
2117 | struct rt6_info *rt; | |
2118 | ||
2119 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2120 | if (skb == NULL) | |
2121 | goto out; | |
2122 | ||
2123 | /* Reserve room for dummy headers, this skb can pass | |
2124 | through good chunk of routing engine. | |
2125 | */ | |
2126 | skb->mac.raw = skb->data; | |
2127 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); | |
2128 | ||
2129 | memset(&fl, 0, sizeof(fl)); | |
2130 | if (rta[RTA_SRC-1]) | |
2131 | ipv6_addr_copy(&fl.fl6_src, | |
2132 | (struct in6_addr*)RTA_DATA(rta[RTA_SRC-1])); | |
2133 | if (rta[RTA_DST-1]) | |
2134 | ipv6_addr_copy(&fl.fl6_dst, | |
2135 | (struct in6_addr*)RTA_DATA(rta[RTA_DST-1])); | |
2136 | ||
2137 | if (rta[RTA_IIF-1]) | |
2138 | memcpy(&iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); | |
2139 | ||
2140 | if (iif) { | |
2141 | struct net_device *dev; | |
2142 | dev = __dev_get_by_index(iif); | |
2143 | if (!dev) { | |
2144 | err = -ENODEV; | |
2145 | goto out_free; | |
2146 | } | |
2147 | } | |
2148 | ||
2149 | fl.oif = 0; | |
2150 | if (rta[RTA_OIF-1]) | |
2151 | memcpy(&fl.oif, RTA_DATA(rta[RTA_OIF-1]), sizeof(int)); | |
2152 | ||
2153 | rt = (struct rt6_info*)ip6_route_output(NULL, &fl); | |
2154 | ||
2155 | skb->dst = &rt->u.dst; | |
2156 | ||
2157 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; | |
2158 | err = rt6_fill_node(skb, rt, | |
2159 | &fl.fl6_dst, &fl.fl6_src, | |
2160 | iif, | |
2161 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, | |
0d51aa80 | 2162 | nlh->nlmsg_seq, 0, 0); |
1da177e4 LT |
2163 | if (err < 0) { |
2164 | err = -EMSGSIZE; | |
2165 | goto out_free; | |
2166 | } | |
2167 | ||
2168 | err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); | |
2169 | if (err > 0) | |
2170 | err = 0; | |
2171 | out: | |
2172 | return err; | |
2173 | out_free: | |
2174 | kfree_skb(skb); | |
2175 | goto out; | |
2176 | } | |
2177 | ||
0d51aa80 JHS |
2178 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nlmsghdr *nlh, |
2179 | struct netlink_skb_parms *req) | |
1da177e4 LT |
2180 | { |
2181 | struct sk_buff *skb; | |
2182 | int size = NLMSG_SPACE(sizeof(struct rtmsg)+256); | |
0d51aa80 JHS |
2183 | u32 pid = current->pid; |
2184 | u32 seq = 0; | |
1da177e4 | 2185 | |
0d51aa80 JHS |
2186 | if (req) |
2187 | pid = req->pid; | |
2188 | if (nlh) | |
2189 | seq = nlh->nlmsg_seq; | |
2190 | ||
1da177e4 LT |
2191 | skb = alloc_skb(size, gfp_any()); |
2192 | if (!skb) { | |
ac6d439d | 2193 | netlink_set_err(rtnl, 0, RTNLGRP_IPV6_ROUTE, ENOBUFS); |
1da177e4 LT |
2194 | return; |
2195 | } | |
0d51aa80 | 2196 | if (rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0) < 0) { |
1da177e4 | 2197 | kfree_skb(skb); |
ac6d439d | 2198 | netlink_set_err(rtnl, 0, RTNLGRP_IPV6_ROUTE, EINVAL); |
1da177e4 LT |
2199 | return; |
2200 | } | |
ac6d439d PM |
2201 | NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_ROUTE; |
2202 | netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_ROUTE, gfp_any()); | |
1da177e4 LT |
2203 | } |
2204 | ||
2205 | /* | |
2206 | * /proc | |
2207 | */ | |
2208 | ||
2209 | #ifdef CONFIG_PROC_FS | |
2210 | ||
2211 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2212 | ||
2213 | struct rt6_proc_arg | |
2214 | { | |
2215 | char *buffer; | |
2216 | int offset; | |
2217 | int length; | |
2218 | int skip; | |
2219 | int len; | |
2220 | }; | |
2221 | ||
2222 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2223 | { | |
2224 | struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg; | |
2225 | int i; | |
2226 | ||
2227 | if (arg->skip < arg->offset / RT6_INFO_LEN) { | |
2228 | arg->skip++; | |
2229 | return 0; | |
2230 | } | |
2231 | ||
2232 | if (arg->len >= arg->length) | |
2233 | return 0; | |
2234 | ||
2235 | for (i=0; i<16; i++) { | |
2236 | sprintf(arg->buffer + arg->len, "%02x", | |
2237 | rt->rt6i_dst.addr.s6_addr[i]); | |
2238 | arg->len += 2; | |
2239 | } | |
2240 | arg->len += sprintf(arg->buffer + arg->len, " %02x ", | |
2241 | rt->rt6i_dst.plen); | |
2242 | ||
2243 | #ifdef CONFIG_IPV6_SUBTREES | |
2244 | for (i=0; i<16; i++) { | |
2245 | sprintf(arg->buffer + arg->len, "%02x", | |
2246 | rt->rt6i_src.addr.s6_addr[i]); | |
2247 | arg->len += 2; | |
2248 | } | |
2249 | arg->len += sprintf(arg->buffer + arg->len, " %02x ", | |
2250 | rt->rt6i_src.plen); | |
2251 | #else | |
2252 | sprintf(arg->buffer + arg->len, | |
2253 | "00000000000000000000000000000000 00 "); | |
2254 | arg->len += 36; | |
2255 | #endif | |
2256 | ||
2257 | if (rt->rt6i_nexthop) { | |
2258 | for (i=0; i<16; i++) { | |
2259 | sprintf(arg->buffer + arg->len, "%02x", | |
2260 | rt->rt6i_nexthop->primary_key[i]); | |
2261 | arg->len += 2; | |
2262 | } | |
2263 | } else { | |
2264 | sprintf(arg->buffer + arg->len, | |
2265 | "00000000000000000000000000000000"); | |
2266 | arg->len += 32; | |
2267 | } | |
2268 | arg->len += sprintf(arg->buffer + arg->len, | |
2269 | " %08x %08x %08x %08x %8s\n", | |
2270 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2271 | rt->u.dst.__use, rt->rt6i_flags, | |
2272 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
2273 | return 0; | |
2274 | } | |
2275 | ||
2276 | static int rt6_proc_info(char *buffer, char **start, off_t offset, int length) | |
2277 | { | |
c71099ac TG |
2278 | struct rt6_proc_arg arg = { |
2279 | .buffer = buffer, | |
2280 | .offset = offset, | |
2281 | .length = length, | |
2282 | }; | |
1da177e4 | 2283 | |
c71099ac | 2284 | fib6_clean_all(rt6_info_route, 0, &arg); |
1da177e4 LT |
2285 | |
2286 | *start = buffer; | |
2287 | if (offset) | |
2288 | *start += offset % RT6_INFO_LEN; | |
2289 | ||
2290 | arg.len -= offset % RT6_INFO_LEN; | |
2291 | ||
2292 | if (arg.len > length) | |
2293 | arg.len = length; | |
2294 | if (arg.len < 0) | |
2295 | arg.len = 0; | |
2296 | ||
2297 | return arg.len; | |
2298 | } | |
2299 | ||
1da177e4 LT |
2300 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2301 | { | |
2302 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
2303 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
2304 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
2305 | rt6_stats.fib_rt_cache, | |
2306 | atomic_read(&ip6_dst_ops.entries), | |
2307 | rt6_stats.fib_discarded_routes); | |
2308 | ||
2309 | return 0; | |
2310 | } | |
2311 | ||
2312 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2313 | { | |
2314 | return single_open(file, rt6_stats_seq_show, NULL); | |
2315 | } | |
2316 | ||
2317 | static struct file_operations rt6_stats_seq_fops = { | |
2318 | .owner = THIS_MODULE, | |
2319 | .open = rt6_stats_seq_open, | |
2320 | .read = seq_read, | |
2321 | .llseek = seq_lseek, | |
2322 | .release = single_release, | |
2323 | }; | |
2324 | #endif /* CONFIG_PROC_FS */ | |
2325 | ||
2326 | #ifdef CONFIG_SYSCTL | |
2327 | ||
2328 | static int flush_delay; | |
2329 | ||
2330 | static | |
2331 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2332 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2333 | { | |
2334 | if (write) { | |
2335 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2336 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); | |
2337 | return 0; | |
2338 | } else | |
2339 | return -EINVAL; | |
2340 | } | |
2341 | ||
2342 | ctl_table ipv6_route_table[] = { | |
2343 | { | |
2344 | .ctl_name = NET_IPV6_ROUTE_FLUSH, | |
2345 | .procname = "flush", | |
2346 | .data = &flush_delay, | |
2347 | .maxlen = sizeof(int), | |
89c8b3a1 | 2348 | .mode = 0200, |
1da177e4 LT |
2349 | .proc_handler = &ipv6_sysctl_rtcache_flush |
2350 | }, | |
2351 | { | |
2352 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2353 | .procname = "gc_thresh", | |
2354 | .data = &ip6_dst_ops.gc_thresh, | |
2355 | .maxlen = sizeof(int), | |
2356 | .mode = 0644, | |
2357 | .proc_handler = &proc_dointvec, | |
2358 | }, | |
2359 | { | |
2360 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2361 | .procname = "max_size", | |
2362 | .data = &ip6_rt_max_size, | |
2363 | .maxlen = sizeof(int), | |
2364 | .mode = 0644, | |
2365 | .proc_handler = &proc_dointvec, | |
2366 | }, | |
2367 | { | |
2368 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2369 | .procname = "gc_min_interval", | |
2370 | .data = &ip6_rt_gc_min_interval, | |
2371 | .maxlen = sizeof(int), | |
2372 | .mode = 0644, | |
2373 | .proc_handler = &proc_dointvec_jiffies, | |
2374 | .strategy = &sysctl_jiffies, | |
2375 | }, | |
2376 | { | |
2377 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2378 | .procname = "gc_timeout", | |
2379 | .data = &ip6_rt_gc_timeout, | |
2380 | .maxlen = sizeof(int), | |
2381 | .mode = 0644, | |
2382 | .proc_handler = &proc_dointvec_jiffies, | |
2383 | .strategy = &sysctl_jiffies, | |
2384 | }, | |
2385 | { | |
2386 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2387 | .procname = "gc_interval", | |
2388 | .data = &ip6_rt_gc_interval, | |
2389 | .maxlen = sizeof(int), | |
2390 | .mode = 0644, | |
2391 | .proc_handler = &proc_dointvec_jiffies, | |
2392 | .strategy = &sysctl_jiffies, | |
2393 | }, | |
2394 | { | |
2395 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2396 | .procname = "gc_elasticity", | |
2397 | .data = &ip6_rt_gc_elasticity, | |
2398 | .maxlen = sizeof(int), | |
2399 | .mode = 0644, | |
2400 | .proc_handler = &proc_dointvec_jiffies, | |
2401 | .strategy = &sysctl_jiffies, | |
2402 | }, | |
2403 | { | |
2404 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2405 | .procname = "mtu_expires", | |
2406 | .data = &ip6_rt_mtu_expires, | |
2407 | .maxlen = sizeof(int), | |
2408 | .mode = 0644, | |
2409 | .proc_handler = &proc_dointvec_jiffies, | |
2410 | .strategy = &sysctl_jiffies, | |
2411 | }, | |
2412 | { | |
2413 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2414 | .procname = "min_adv_mss", | |
2415 | .data = &ip6_rt_min_advmss, | |
2416 | .maxlen = sizeof(int), | |
2417 | .mode = 0644, | |
2418 | .proc_handler = &proc_dointvec_jiffies, | |
2419 | .strategy = &sysctl_jiffies, | |
2420 | }, | |
2421 | { | |
2422 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2423 | .procname = "gc_min_interval_ms", | |
2424 | .data = &ip6_rt_gc_min_interval, | |
2425 | .maxlen = sizeof(int), | |
2426 | .mode = 0644, | |
2427 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2428 | .strategy = &sysctl_ms_jiffies, | |
2429 | }, | |
2430 | { .ctl_name = 0 } | |
2431 | }; | |
2432 | ||
2433 | #endif | |
2434 | ||
2435 | void __init ip6_route_init(void) | |
2436 | { | |
2437 | struct proc_dir_entry *p; | |
2438 | ||
2439 | ip6_dst_ops.kmem_cachep = kmem_cache_create("ip6_dst_cache", | |
2440 | sizeof(struct rt6_info), | |
2441 | 0, SLAB_HWCACHE_ALIGN, | |
2442 | NULL, NULL); | |
2443 | if (!ip6_dst_ops.kmem_cachep) | |
2444 | panic("cannot create ip6_dst_cache"); | |
2445 | ||
2446 | fib6_init(); | |
2447 | #ifdef CONFIG_PROC_FS | |
2448 | p = proc_net_create("ipv6_route", 0, rt6_proc_info); | |
2449 | if (p) | |
2450 | p->owner = THIS_MODULE; | |
2451 | ||
2452 | proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2453 | #endif | |
2454 | #ifdef CONFIG_XFRM | |
2455 | xfrm6_init(); | |
2456 | #endif | |
101367c2 TG |
2457 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2458 | fib6_rules_init(); | |
2459 | #endif | |
1da177e4 LT |
2460 | } |
2461 | ||
2462 | void ip6_route_cleanup(void) | |
2463 | { | |
101367c2 TG |
2464 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2465 | fib6_rules_cleanup(); | |
2466 | #endif | |
1da177e4 LT |
2467 | #ifdef CONFIG_PROC_FS |
2468 | proc_net_remove("ipv6_route"); | |
2469 | proc_net_remove("rt6_stats"); | |
2470 | #endif | |
2471 | #ifdef CONFIG_XFRM | |
2472 | xfrm6_fini(); | |
2473 | #endif | |
2474 | rt6_ifdown(NULL); | |
2475 | fib6_gc_cleanup(); | |
2476 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2477 | } |