Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
7 | * | |
8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | /* Changes: | |
17 | * | |
18 | * YOSHIFUJI Hideaki @USAGI | |
19 | * reworked default router selection. | |
20 | * - respect outgoing interface | |
21 | * - select from (probably) reachable routers (i.e. | |
22 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
23 | * - always select the same router if it is (probably) | |
24 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
25 | * Ville Nuorvala |
26 | * Fixed routing subtrees. | |
1da177e4 LT |
27 | */ |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 LT |
30 | #include <linux/errno.h> |
31 | #include <linux/types.h> | |
32 | #include <linux/times.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/sockios.h> | |
35 | #include <linux/net.h> | |
36 | #include <linux/route.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/in6.h> | |
39 | #include <linux/init.h> | |
1da177e4 LT |
40 | #include <linux/if_arp.h> |
41 | ||
42 | #ifdef CONFIG_PROC_FS | |
43 | #include <linux/proc_fs.h> | |
44 | #include <linux/seq_file.h> | |
45 | #endif | |
46 | ||
47 | #include <net/snmp.h> | |
48 | #include <net/ipv6.h> | |
49 | #include <net/ip6_fib.h> | |
50 | #include <net/ip6_route.h> | |
51 | #include <net/ndisc.h> | |
52 | #include <net/addrconf.h> | |
53 | #include <net/tcp.h> | |
54 | #include <linux/rtnetlink.h> | |
55 | #include <net/dst.h> | |
56 | #include <net/xfrm.h> | |
8d71740c | 57 | #include <net/netevent.h> |
21713ebc | 58 | #include <net/netlink.h> |
1da177e4 LT |
59 | |
60 | #include <asm/uaccess.h> | |
61 | ||
62 | #ifdef CONFIG_SYSCTL | |
63 | #include <linux/sysctl.h> | |
64 | #endif | |
65 | ||
66 | /* Set to 3 to get tracing. */ | |
67 | #define RT6_DEBUG 2 | |
68 | ||
69 | #if RT6_DEBUG >= 3 | |
70 | #define RDBG(x) printk x | |
71 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
72 | #else | |
73 | #define RDBG(x) | |
74 | #define RT6_TRACE(x...) do { ; } while (0) | |
75 | #endif | |
76 | ||
519fbd87 | 77 | #define CLONE_OFFLINK_ROUTE 0 |
1da177e4 LT |
78 | |
79 | static int ip6_rt_max_size = 4096; | |
80 | static int ip6_rt_gc_min_interval = HZ / 2; | |
81 | static int ip6_rt_gc_timeout = 60*HZ; | |
82 | int ip6_rt_gc_interval = 30*HZ; | |
83 | static int ip6_rt_gc_elasticity = 9; | |
84 | static int ip6_rt_mtu_expires = 10*60*HZ; | |
85 | static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
86 | ||
87 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); | |
88 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
89 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
90 | static void ip6_dst_destroy(struct dst_entry *); | |
91 | static void ip6_dst_ifdown(struct dst_entry *, | |
92 | struct net_device *dev, int how); | |
93 | static int ip6_dst_gc(void); | |
94 | ||
95 | static int ip6_pkt_discard(struct sk_buff *skb); | |
96 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
97 | static void ip6_link_failure(struct sk_buff *skb); | |
98 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
99 | ||
70ceb4f5 YH |
100 | #ifdef CONFIG_IPV6_ROUTE_INFO |
101 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
102 | struct in6_addr *gwaddr, int ifindex, | |
103 | unsigned pref); | |
104 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
105 | struct in6_addr *gwaddr, int ifindex); | |
106 | #endif | |
107 | ||
1da177e4 LT |
108 | static struct dst_ops ip6_dst_ops = { |
109 | .family = AF_INET6, | |
110 | .protocol = __constant_htons(ETH_P_IPV6), | |
111 | .gc = ip6_dst_gc, | |
112 | .gc_thresh = 1024, | |
113 | .check = ip6_dst_check, | |
114 | .destroy = ip6_dst_destroy, | |
115 | .ifdown = ip6_dst_ifdown, | |
116 | .negative_advice = ip6_negative_advice, | |
117 | .link_failure = ip6_link_failure, | |
118 | .update_pmtu = ip6_rt_update_pmtu, | |
119 | .entry_size = sizeof(struct rt6_info), | |
120 | }; | |
121 | ||
122 | struct rt6_info ip6_null_entry = { | |
123 | .u = { | |
124 | .dst = { | |
125 | .__refcnt = ATOMIC_INIT(1), | |
126 | .__use = 1, | |
127 | .dev = &loopback_dev, | |
128 | .obsolete = -1, | |
129 | .error = -ENETUNREACH, | |
130 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
131 | .input = ip6_pkt_discard, | |
132 | .output = ip6_pkt_discard_out, | |
133 | .ops = &ip6_dst_ops, | |
134 | .path = (struct dst_entry*)&ip6_null_entry, | |
135 | } | |
136 | }, | |
137 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
138 | .rt6i_metric = ~(u32) 0, | |
139 | .rt6i_ref = ATOMIC_INIT(1), | |
140 | }; | |
141 | ||
101367c2 TG |
142 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
143 | ||
144 | struct rt6_info ip6_prohibit_entry = { | |
145 | .u = { | |
146 | .dst = { | |
147 | .__refcnt = ATOMIC_INIT(1), | |
148 | .__use = 1, | |
149 | .dev = &loopback_dev, | |
150 | .obsolete = -1, | |
151 | .error = -EACCES, | |
152 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
153 | .input = ip6_pkt_discard, | |
154 | .output = ip6_pkt_discard_out, | |
155 | .ops = &ip6_dst_ops, | |
156 | .path = (struct dst_entry*)&ip6_prohibit_entry, | |
157 | } | |
158 | }, | |
159 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
160 | .rt6i_metric = ~(u32) 0, | |
161 | .rt6i_ref = ATOMIC_INIT(1), | |
162 | }; | |
163 | ||
164 | struct rt6_info ip6_blk_hole_entry = { | |
165 | .u = { | |
166 | .dst = { | |
167 | .__refcnt = ATOMIC_INIT(1), | |
168 | .__use = 1, | |
169 | .dev = &loopback_dev, | |
170 | .obsolete = -1, | |
171 | .error = -EINVAL, | |
172 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
173 | .input = ip6_pkt_discard, | |
174 | .output = ip6_pkt_discard_out, | |
175 | .ops = &ip6_dst_ops, | |
176 | .path = (struct dst_entry*)&ip6_blk_hole_entry, | |
177 | } | |
178 | }, | |
179 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
180 | .rt6i_metric = ~(u32) 0, | |
181 | .rt6i_ref = ATOMIC_INIT(1), | |
182 | }; | |
183 | ||
184 | #endif | |
185 | ||
1da177e4 LT |
186 | /* allocate dst with ip6_dst_ops */ |
187 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
188 | { | |
189 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
190 | } | |
191 | ||
192 | static void ip6_dst_destroy(struct dst_entry *dst) | |
193 | { | |
194 | struct rt6_info *rt = (struct rt6_info *)dst; | |
195 | struct inet6_dev *idev = rt->rt6i_idev; | |
196 | ||
197 | if (idev != NULL) { | |
198 | rt->rt6i_idev = NULL; | |
199 | in6_dev_put(idev); | |
200 | } | |
201 | } | |
202 | ||
203 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
204 | int how) | |
205 | { | |
206 | struct rt6_info *rt = (struct rt6_info *)dst; | |
207 | struct inet6_dev *idev = rt->rt6i_idev; | |
208 | ||
209 | if (dev != &loopback_dev && idev != NULL && idev->dev == dev) { | |
210 | struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev); | |
211 | if (loopback_idev != NULL) { | |
212 | rt->rt6i_idev = loopback_idev; | |
213 | in6_dev_put(idev); | |
214 | } | |
215 | } | |
216 | } | |
217 | ||
218 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
219 | { | |
220 | return (rt->rt6i_flags & RTF_EXPIRES && | |
221 | time_after(jiffies, rt->rt6i_expires)); | |
222 | } | |
223 | ||
c71099ac TG |
224 | static inline int rt6_need_strict(struct in6_addr *daddr) |
225 | { | |
226 | return (ipv6_addr_type(daddr) & | |
227 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
228 | } | |
229 | ||
1da177e4 | 230 | /* |
c71099ac | 231 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
232 | */ |
233 | ||
234 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
235 | int oif, | |
236 | int strict) | |
237 | { | |
238 | struct rt6_info *local = NULL; | |
239 | struct rt6_info *sprt; | |
240 | ||
241 | if (oif) { | |
242 | for (sprt = rt; sprt; sprt = sprt->u.next) { | |
243 | struct net_device *dev = sprt->rt6i_dev; | |
244 | if (dev->ifindex == oif) | |
245 | return sprt; | |
246 | if (dev->flags & IFF_LOOPBACK) { | |
247 | if (sprt->rt6i_idev == NULL || | |
248 | sprt->rt6i_idev->dev->ifindex != oif) { | |
249 | if (strict && oif) | |
250 | continue; | |
251 | if (local && (!oif || | |
252 | local->rt6i_idev->dev->ifindex == oif)) | |
253 | continue; | |
254 | } | |
255 | local = sprt; | |
256 | } | |
257 | } | |
258 | ||
259 | if (local) | |
260 | return local; | |
261 | ||
262 | if (strict) | |
263 | return &ip6_null_entry; | |
264 | } | |
265 | return rt; | |
266 | } | |
267 | ||
27097255 YH |
268 | #ifdef CONFIG_IPV6_ROUTER_PREF |
269 | static void rt6_probe(struct rt6_info *rt) | |
270 | { | |
271 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
272 | /* | |
273 | * Okay, this does not seem to be appropriate | |
274 | * for now, however, we need to check if it | |
275 | * is really so; aka Router Reachability Probing. | |
276 | * | |
277 | * Router Reachability Probe MUST be rate-limited | |
278 | * to no more than one per minute. | |
279 | */ | |
280 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
281 | return; | |
282 | read_lock_bh(&neigh->lock); | |
283 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 284 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
285 | struct in6_addr mcaddr; |
286 | struct in6_addr *target; | |
287 | ||
288 | neigh->updated = jiffies; | |
289 | read_unlock_bh(&neigh->lock); | |
290 | ||
291 | target = (struct in6_addr *)&neigh->primary_key; | |
292 | addrconf_addr_solict_mult(target, &mcaddr); | |
293 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
294 | } else | |
295 | read_unlock_bh(&neigh->lock); | |
296 | } | |
297 | #else | |
298 | static inline void rt6_probe(struct rt6_info *rt) | |
299 | { | |
300 | return; | |
301 | } | |
302 | #endif | |
303 | ||
1da177e4 | 304 | /* |
554cfb7e | 305 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 306 | */ |
554cfb7e YH |
307 | static int inline rt6_check_dev(struct rt6_info *rt, int oif) |
308 | { | |
309 | struct net_device *dev = rt->rt6i_dev; | |
310 | if (!oif || dev->ifindex == oif) | |
311 | return 2; | |
312 | if ((dev->flags & IFF_LOOPBACK) && | |
313 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
314 | return 1; | |
315 | return 0; | |
316 | } | |
1da177e4 | 317 | |
554cfb7e | 318 | static int inline rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 319 | { |
554cfb7e YH |
320 | struct neighbour *neigh = rt->rt6i_nexthop; |
321 | int m = 0; | |
4d0c5911 YH |
322 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
323 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
324 | m = 1; | |
325 | else if (neigh) { | |
554cfb7e YH |
326 | read_lock_bh(&neigh->lock); |
327 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 328 | m = 2; |
554cfb7e | 329 | read_unlock_bh(&neigh->lock); |
1da177e4 | 330 | } |
554cfb7e | 331 | return m; |
1da177e4 LT |
332 | } |
333 | ||
554cfb7e YH |
334 | static int rt6_score_route(struct rt6_info *rt, int oif, |
335 | int strict) | |
1da177e4 | 336 | { |
4d0c5911 YH |
337 | int m, n; |
338 | ||
339 | m = rt6_check_dev(rt, oif); | |
77d16f45 | 340 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 341 | return -1; |
ebacaaa0 YH |
342 | #ifdef CONFIG_IPV6_ROUTER_PREF |
343 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
344 | #endif | |
4d0c5911 YH |
345 | n = rt6_check_neigh(rt); |
346 | if (n > 1) | |
ebacaaa0 | 347 | m |= 16; |
77d16f45 | 348 | else if (!n && strict & RT6_LOOKUP_F_REACHABLE) |
554cfb7e YH |
349 | return -1; |
350 | return m; | |
351 | } | |
352 | ||
353 | static struct rt6_info *rt6_select(struct rt6_info **head, int oif, | |
354 | int strict) | |
355 | { | |
356 | struct rt6_info *match = NULL, *last = NULL; | |
357 | struct rt6_info *rt, *rt0 = *head; | |
358 | u32 metric; | |
359 | int mpri = -1; | |
1da177e4 | 360 | |
554cfb7e YH |
361 | RT6_TRACE("%s(head=%p(*head=%p), oif=%d)\n", |
362 | __FUNCTION__, head, head ? *head : NULL, oif); | |
1da177e4 | 363 | |
554cfb7e | 364 | for (rt = rt0, metric = rt0->rt6i_metric; |
c302e6d5 | 365 | rt && rt->rt6i_metric == metric && (!last || rt != rt0); |
554cfb7e YH |
366 | rt = rt->u.next) { |
367 | int m; | |
1da177e4 | 368 | |
554cfb7e | 369 | if (rt6_check_expired(rt)) |
1da177e4 LT |
370 | continue; |
371 | ||
554cfb7e YH |
372 | last = rt; |
373 | ||
374 | m = rt6_score_route(rt, oif, strict); | |
375 | if (m < 0) | |
1da177e4 | 376 | continue; |
1da177e4 | 377 | |
554cfb7e | 378 | if (m > mpri) { |
27097255 | 379 | rt6_probe(match); |
554cfb7e | 380 | match = rt; |
1da177e4 | 381 | mpri = m; |
27097255 YH |
382 | } else { |
383 | rt6_probe(rt); | |
1da177e4 LT |
384 | } |
385 | } | |
386 | ||
554cfb7e | 387 | if (!match && |
77d16f45 | 388 | (strict & RT6_LOOKUP_F_REACHABLE) && |
554cfb7e YH |
389 | last && last != rt0) { |
390 | /* no entries matched; do round-robin */ | |
34af946a | 391 | static DEFINE_SPINLOCK(lock); |
c302e6d5 | 392 | spin_lock(&lock); |
554cfb7e YH |
393 | *head = rt0->u.next; |
394 | rt0->u.next = last->u.next; | |
395 | last->u.next = rt0; | |
c302e6d5 | 396 | spin_unlock(&lock); |
1da177e4 | 397 | } |
1da177e4 | 398 | |
554cfb7e YH |
399 | RT6_TRACE("%s() => %p, score=%d\n", |
400 | __FUNCTION__, match, mpri); | |
1da177e4 | 401 | |
554cfb7e | 402 | return (match ? match : &ip6_null_entry); |
1da177e4 LT |
403 | } |
404 | ||
70ceb4f5 YH |
405 | #ifdef CONFIG_IPV6_ROUTE_INFO |
406 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
407 | struct in6_addr *gwaddr) | |
408 | { | |
409 | struct route_info *rinfo = (struct route_info *) opt; | |
410 | struct in6_addr prefix_buf, *prefix; | |
411 | unsigned int pref; | |
412 | u32 lifetime; | |
413 | struct rt6_info *rt; | |
414 | ||
415 | if (len < sizeof(struct route_info)) { | |
416 | return -EINVAL; | |
417 | } | |
418 | ||
419 | /* Sanity check for prefix_len and length */ | |
420 | if (rinfo->length > 3) { | |
421 | return -EINVAL; | |
422 | } else if (rinfo->prefix_len > 128) { | |
423 | return -EINVAL; | |
424 | } else if (rinfo->prefix_len > 64) { | |
425 | if (rinfo->length < 2) { | |
426 | return -EINVAL; | |
427 | } | |
428 | } else if (rinfo->prefix_len > 0) { | |
429 | if (rinfo->length < 1) { | |
430 | return -EINVAL; | |
431 | } | |
432 | } | |
433 | ||
434 | pref = rinfo->route_pref; | |
435 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
436 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
437 | ||
438 | lifetime = htonl(rinfo->lifetime); | |
439 | if (lifetime == 0xffffffff) { | |
440 | /* infinity */ | |
441 | } else if (lifetime > 0x7fffffff/HZ) { | |
442 | /* Avoid arithmetic overflow */ | |
443 | lifetime = 0x7fffffff/HZ - 1; | |
444 | } | |
445 | ||
446 | if (rinfo->length == 3) | |
447 | prefix = (struct in6_addr *)rinfo->prefix; | |
448 | else { | |
449 | /* this function is safe */ | |
450 | ipv6_addr_prefix(&prefix_buf, | |
451 | (struct in6_addr *)rinfo->prefix, | |
452 | rinfo->prefix_len); | |
453 | prefix = &prefix_buf; | |
454 | } | |
455 | ||
456 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
457 | ||
458 | if (rt && !lifetime) { | |
e0a1ad73 | 459 | ip6_del_rt(rt); |
70ceb4f5 YH |
460 | rt = NULL; |
461 | } | |
462 | ||
463 | if (!rt && lifetime) | |
464 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
465 | pref); | |
466 | else if (rt) | |
467 | rt->rt6i_flags = RTF_ROUTEINFO | | |
468 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
469 | ||
470 | if (rt) { | |
471 | if (lifetime == 0xffffffff) { | |
472 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
473 | } else { | |
474 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
475 | rt->rt6i_flags |= RTF_EXPIRES; | |
476 | } | |
477 | dst_release(&rt->u.dst); | |
478 | } | |
479 | return 0; | |
480 | } | |
481 | #endif | |
482 | ||
982f56f3 YH |
483 | #define BACKTRACK(saddr) \ |
484 | do { \ | |
485 | if (rt == &ip6_null_entry) { \ | |
486 | struct fib6_node *pn; \ | |
487 | while (fn) { \ | |
488 | if (fn->fn_flags & RTN_TL_ROOT) \ | |
489 | goto out; \ | |
490 | pn = fn->parent; \ | |
491 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
492 | fn = fib6_lookup(pn->subtree, NULL, saddr); \ | |
493 | else \ | |
494 | fn = pn; \ | |
495 | if (fn->fn_flags & RTN_RTINFO) \ | |
496 | goto restart; \ | |
c71099ac | 497 | } \ |
c71099ac | 498 | } \ |
982f56f3 | 499 | } while(0) |
c71099ac TG |
500 | |
501 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
502 | struct flowi *fl, int flags) | |
1da177e4 LT |
503 | { |
504 | struct fib6_node *fn; | |
505 | struct rt6_info *rt; | |
506 | ||
c71099ac TG |
507 | read_lock_bh(&table->tb6_lock); |
508 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
509 | restart: | |
510 | rt = fn->leaf; | |
77d16f45 | 511 | rt = rt6_device_match(rt, fl->oif, flags); |
982f56f3 | 512 | BACKTRACK(&fl->fl6_src); |
c71099ac | 513 | out: |
33cc4896 | 514 | dst_hold(&rt->u.dst); |
c71099ac | 515 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
516 | |
517 | rt->u.dst.lastuse = jiffies; | |
c71099ac TG |
518 | rt->u.dst.__use++; |
519 | ||
520 | return rt; | |
521 | ||
522 | } | |
523 | ||
524 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, | |
525 | int oif, int strict) | |
526 | { | |
527 | struct flowi fl = { | |
528 | .oif = oif, | |
529 | .nl_u = { | |
530 | .ip6_u = { | |
531 | .daddr = *daddr, | |
c71099ac TG |
532 | }, |
533 | }, | |
534 | }; | |
535 | struct dst_entry *dst; | |
77d16f45 | 536 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 537 | |
adaa70bb TG |
538 | if (saddr) { |
539 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
540 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
541 | } | |
542 | ||
c71099ac TG |
543 | dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup); |
544 | if (dst->error == 0) | |
545 | return (struct rt6_info *) dst; | |
546 | ||
547 | dst_release(dst); | |
548 | ||
1da177e4 LT |
549 | return NULL; |
550 | } | |
551 | ||
c71099ac | 552 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
553 | It takes new route entry, the addition fails by any reason the |
554 | route is freed. In any case, if caller does not hold it, it may | |
555 | be destroyed. | |
556 | */ | |
557 | ||
86872cb5 | 558 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
559 | { |
560 | int err; | |
c71099ac | 561 | struct fib6_table *table; |
1da177e4 | 562 | |
c71099ac TG |
563 | table = rt->rt6i_table; |
564 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 565 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 566 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
567 | |
568 | return err; | |
569 | } | |
570 | ||
40e22e8f TG |
571 | int ip6_ins_rt(struct rt6_info *rt) |
572 | { | |
86872cb5 | 573 | return __ip6_ins_rt(rt, NULL); |
40e22e8f TG |
574 | } |
575 | ||
95a9a5ba YH |
576 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
577 | struct in6_addr *saddr) | |
1da177e4 | 578 | { |
1da177e4 LT |
579 | struct rt6_info *rt; |
580 | ||
581 | /* | |
582 | * Clone the route. | |
583 | */ | |
584 | ||
585 | rt = ip6_rt_copy(ort); | |
586 | ||
587 | if (rt) { | |
58c4fb86 YH |
588 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
589 | if (rt->rt6i_dst.plen != 128 && | |
590 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
591 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 592 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 593 | } |
1da177e4 | 594 | |
58c4fb86 | 595 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
596 | rt->rt6i_dst.plen = 128; |
597 | rt->rt6i_flags |= RTF_CACHE; | |
598 | rt->u.dst.flags |= DST_HOST; | |
599 | ||
600 | #ifdef CONFIG_IPV6_SUBTREES | |
601 | if (rt->rt6i_src.plen && saddr) { | |
602 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
603 | rt->rt6i_src.plen = 128; | |
604 | } | |
605 | #endif | |
606 | ||
607 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
608 | ||
95a9a5ba | 609 | } |
1da177e4 | 610 | |
95a9a5ba YH |
611 | return rt; |
612 | } | |
1da177e4 | 613 | |
299d9939 YH |
614 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
615 | { | |
616 | struct rt6_info *rt = ip6_rt_copy(ort); | |
617 | if (rt) { | |
618 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
619 | rt->rt6i_dst.plen = 128; | |
620 | rt->rt6i_flags |= RTF_CACHE; | |
621 | if (rt->rt6i_flags & RTF_REJECT) | |
622 | rt->u.dst.error = ort->u.dst.error; | |
623 | rt->u.dst.flags |= DST_HOST; | |
624 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
625 | } | |
626 | return rt; | |
627 | } | |
628 | ||
8ce11e6a AB |
629 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, |
630 | struct flowi *fl, int flags) | |
1da177e4 LT |
631 | { |
632 | struct fib6_node *fn; | |
519fbd87 | 633 | struct rt6_info *rt, *nrt; |
c71099ac | 634 | int strict = 0; |
1da177e4 | 635 | int attempts = 3; |
519fbd87 | 636 | int err; |
77d16f45 | 637 | int reachable = RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 638 | |
77d16f45 | 639 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
640 | |
641 | relookup: | |
c71099ac | 642 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 643 | |
8238dd06 | 644 | restart_2: |
c71099ac | 645 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
646 | |
647 | restart: | |
c71099ac | 648 | rt = rt6_select(&fn->leaf, fl->iif, strict | reachable); |
982f56f3 | 649 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
650 | if (rt == &ip6_null_entry || |
651 | rt->rt6i_flags & RTF_CACHE) | |
1ddef044 | 652 | goto out; |
1da177e4 | 653 | |
fb9de91e | 654 | dst_hold(&rt->u.dst); |
c71099ac | 655 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 656 | |
519fbd87 | 657 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 658 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
659 | else { |
660 | #if CLONE_OFFLINK_ROUTE | |
c71099ac | 661 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
519fbd87 YH |
662 | #else |
663 | goto out2; | |
664 | #endif | |
665 | } | |
e40cf353 | 666 | |
519fbd87 YH |
667 | dst_release(&rt->u.dst); |
668 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 669 | |
519fbd87 YH |
670 | dst_hold(&rt->u.dst); |
671 | if (nrt) { | |
40e22e8f | 672 | err = ip6_ins_rt(nrt); |
519fbd87 | 673 | if (!err) |
1da177e4 | 674 | goto out2; |
1da177e4 | 675 | } |
1da177e4 | 676 | |
519fbd87 YH |
677 | if (--attempts <= 0) |
678 | goto out2; | |
679 | ||
680 | /* | |
c71099ac | 681 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
682 | * released someone could insert this route. Relookup. |
683 | */ | |
684 | dst_release(&rt->u.dst); | |
685 | goto relookup; | |
686 | ||
687 | out: | |
8238dd06 YH |
688 | if (reachable) { |
689 | reachable = 0; | |
690 | goto restart_2; | |
691 | } | |
519fbd87 | 692 | dst_hold(&rt->u.dst); |
c71099ac | 693 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
694 | out2: |
695 | rt->u.dst.lastuse = jiffies; | |
696 | rt->u.dst.__use++; | |
c71099ac TG |
697 | |
698 | return rt; | |
1da177e4 LT |
699 | } |
700 | ||
c71099ac TG |
701 | void ip6_route_input(struct sk_buff *skb) |
702 | { | |
703 | struct ipv6hdr *iph = skb->nh.ipv6h; | |
adaa70bb | 704 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
705 | struct flowi fl = { |
706 | .iif = skb->dev->ifindex, | |
707 | .nl_u = { | |
708 | .ip6_u = { | |
709 | .daddr = iph->daddr, | |
710 | .saddr = iph->saddr, | |
267935b1 | 711 | #ifdef CONFIG_IPV6_ROUTE_FWMARK |
75bff8f0 | 712 | .fwmark = skb->nfmark, |
267935b1 | 713 | #endif |
c71099ac TG |
714 | .flowlabel = (* (u32 *) iph)&IPV6_FLOWINFO_MASK, |
715 | }, | |
716 | }, | |
717 | .proto = iph->nexthdr, | |
718 | }; | |
adaa70bb TG |
719 | |
720 | if (rt6_need_strict(&iph->daddr)) | |
721 | flags |= RT6_LOOKUP_F_IFACE; | |
c71099ac TG |
722 | |
723 | skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input); | |
724 | } | |
725 | ||
726 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
727 | struct flowi *fl, int flags) | |
1da177e4 LT |
728 | { |
729 | struct fib6_node *fn; | |
519fbd87 | 730 | struct rt6_info *rt, *nrt; |
c71099ac | 731 | int strict = 0; |
1da177e4 | 732 | int attempts = 3; |
519fbd87 | 733 | int err; |
77d16f45 | 734 | int reachable = RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 735 | |
77d16f45 | 736 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
737 | |
738 | relookup: | |
c71099ac | 739 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 740 | |
8238dd06 | 741 | restart_2: |
c71099ac | 742 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
743 | |
744 | restart: | |
8238dd06 | 745 | rt = rt6_select(&fn->leaf, fl->oif, strict | reachable); |
982f56f3 | 746 | BACKTRACK(&fl->fl6_src); |
8238dd06 YH |
747 | if (rt == &ip6_null_entry || |
748 | rt->rt6i_flags & RTF_CACHE) | |
1da177e4 | 749 | goto out; |
1da177e4 | 750 | |
fb9de91e | 751 | dst_hold(&rt->u.dst); |
c71099ac | 752 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 753 | |
519fbd87 | 754 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
e40cf353 | 755 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
519fbd87 YH |
756 | else { |
757 | #if CLONE_OFFLINK_ROUTE | |
758 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); | |
759 | #else | |
760 | goto out2; | |
761 | #endif | |
762 | } | |
1da177e4 | 763 | |
519fbd87 YH |
764 | dst_release(&rt->u.dst); |
765 | rt = nrt ? : &ip6_null_entry; | |
1da177e4 | 766 | |
519fbd87 YH |
767 | dst_hold(&rt->u.dst); |
768 | if (nrt) { | |
40e22e8f | 769 | err = ip6_ins_rt(nrt); |
519fbd87 | 770 | if (!err) |
1da177e4 | 771 | goto out2; |
1da177e4 | 772 | } |
e40cf353 | 773 | |
519fbd87 YH |
774 | if (--attempts <= 0) |
775 | goto out2; | |
776 | ||
777 | /* | |
c71099ac | 778 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
779 | * released someone could insert this route. Relookup. |
780 | */ | |
781 | dst_release(&rt->u.dst); | |
782 | goto relookup; | |
783 | ||
784 | out: | |
8238dd06 YH |
785 | if (reachable) { |
786 | reachable = 0; | |
787 | goto restart_2; | |
788 | } | |
519fbd87 | 789 | dst_hold(&rt->u.dst); |
c71099ac | 790 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
791 | out2: |
792 | rt->u.dst.lastuse = jiffies; | |
793 | rt->u.dst.__use++; | |
c71099ac TG |
794 | return rt; |
795 | } | |
796 | ||
797 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
798 | { | |
799 | int flags = 0; | |
800 | ||
801 | if (rt6_need_strict(&fl->fl6_dst)) | |
77d16f45 | 802 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 803 | |
adaa70bb TG |
804 | if (!ipv6_addr_any(&fl->fl6_src)) |
805 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
806 | ||
c71099ac | 807 | return fib6_rule_lookup(fl, flags, ip6_pol_route_output); |
1da177e4 LT |
808 | } |
809 | ||
810 | ||
811 | /* | |
812 | * Destination cache support functions | |
813 | */ | |
814 | ||
815 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
816 | { | |
817 | struct rt6_info *rt; | |
818 | ||
819 | rt = (struct rt6_info *) dst; | |
820 | ||
821 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
822 | return dst; | |
823 | ||
824 | return NULL; | |
825 | } | |
826 | ||
827 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
828 | { | |
829 | struct rt6_info *rt = (struct rt6_info *) dst; | |
830 | ||
831 | if (rt) { | |
832 | if (rt->rt6i_flags & RTF_CACHE) | |
e0a1ad73 | 833 | ip6_del_rt(rt); |
1da177e4 LT |
834 | else |
835 | dst_release(dst); | |
836 | } | |
837 | return NULL; | |
838 | } | |
839 | ||
840 | static void ip6_link_failure(struct sk_buff *skb) | |
841 | { | |
842 | struct rt6_info *rt; | |
843 | ||
844 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
845 | ||
846 | rt = (struct rt6_info *) skb->dst; | |
847 | if (rt) { | |
848 | if (rt->rt6i_flags&RTF_CACHE) { | |
849 | dst_set_expires(&rt->u.dst, 0); | |
850 | rt->rt6i_flags |= RTF_EXPIRES; | |
851 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
852 | rt->rt6i_node->fn_sernum = -1; | |
853 | } | |
854 | } | |
855 | ||
856 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
857 | { | |
858 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
859 | ||
860 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
861 | rt6->rt6i_flags |= RTF_MODIFIED; | |
862 | if (mtu < IPV6_MIN_MTU) { | |
863 | mtu = IPV6_MIN_MTU; | |
864 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
865 | } | |
866 | dst->metrics[RTAX_MTU-1] = mtu; | |
8d71740c | 867 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); |
1da177e4 LT |
868 | } |
869 | } | |
870 | ||
1da177e4 LT |
871 | static int ipv6_get_mtu(struct net_device *dev); |
872 | ||
873 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
874 | { | |
875 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
876 | ||
877 | if (mtu < ip6_rt_min_advmss) | |
878 | mtu = ip6_rt_min_advmss; | |
879 | ||
880 | /* | |
881 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and | |
882 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
883 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
884 | * rely only on pmtu discovery" | |
885 | */ | |
886 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
887 | mtu = IPV6_MAXPLEN; | |
888 | return mtu; | |
889 | } | |
890 | ||
5d0bbeeb | 891 | static struct dst_entry *ndisc_dst_gc_list; |
8ce11e6a | 892 | static DEFINE_SPINLOCK(ndisc_lock); |
5d0bbeeb | 893 | |
1da177e4 LT |
894 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, |
895 | struct neighbour *neigh, | |
896 | struct in6_addr *addr, | |
897 | int (*output)(struct sk_buff *)) | |
898 | { | |
899 | struct rt6_info *rt; | |
900 | struct inet6_dev *idev = in6_dev_get(dev); | |
901 | ||
902 | if (unlikely(idev == NULL)) | |
903 | return NULL; | |
904 | ||
905 | rt = ip6_dst_alloc(); | |
906 | if (unlikely(rt == NULL)) { | |
907 | in6_dev_put(idev); | |
908 | goto out; | |
909 | } | |
910 | ||
911 | dev_hold(dev); | |
912 | if (neigh) | |
913 | neigh_hold(neigh); | |
914 | else | |
915 | neigh = ndisc_get_neigh(dev, addr); | |
916 | ||
917 | rt->rt6i_dev = dev; | |
918 | rt->rt6i_idev = idev; | |
919 | rt->rt6i_nexthop = neigh; | |
920 | atomic_set(&rt->u.dst.__refcnt, 1); | |
921 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
922 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
923 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
924 | rt->u.dst.output = output; | |
925 | ||
926 | #if 0 /* there's no chance to use these for ndisc */ | |
927 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST | |
928 | ? DST_HOST | |
929 | : 0; | |
930 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
931 | rt->rt6i_dst.plen = 128; | |
932 | #endif | |
933 | ||
5d0bbeeb | 934 | spin_lock_bh(&ndisc_lock); |
1da177e4 LT |
935 | rt->u.dst.next = ndisc_dst_gc_list; |
936 | ndisc_dst_gc_list = &rt->u.dst; | |
5d0bbeeb | 937 | spin_unlock_bh(&ndisc_lock); |
1da177e4 LT |
938 | |
939 | fib6_force_start_gc(); | |
940 | ||
941 | out: | |
942 | return (struct dst_entry *)rt; | |
943 | } | |
944 | ||
945 | int ndisc_dst_gc(int *more) | |
946 | { | |
947 | struct dst_entry *dst, *next, **pprev; | |
948 | int freed; | |
949 | ||
950 | next = NULL; | |
5d0bbeeb TG |
951 | freed = 0; |
952 | ||
953 | spin_lock_bh(&ndisc_lock); | |
1da177e4 | 954 | pprev = &ndisc_dst_gc_list; |
5d0bbeeb | 955 | |
1da177e4 LT |
956 | while ((dst = *pprev) != NULL) { |
957 | if (!atomic_read(&dst->__refcnt)) { | |
958 | *pprev = dst->next; | |
959 | dst_free(dst); | |
960 | freed++; | |
961 | } else { | |
962 | pprev = &dst->next; | |
963 | (*more)++; | |
964 | } | |
965 | } | |
966 | ||
5d0bbeeb TG |
967 | spin_unlock_bh(&ndisc_lock); |
968 | ||
1da177e4 LT |
969 | return freed; |
970 | } | |
971 | ||
972 | static int ip6_dst_gc(void) | |
973 | { | |
974 | static unsigned expire = 30*HZ; | |
975 | static unsigned long last_gc; | |
976 | unsigned long now = jiffies; | |
977 | ||
978 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && | |
979 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) | |
980 | goto out; | |
981 | ||
982 | expire++; | |
983 | fib6_run_gc(expire); | |
984 | last_gc = now; | |
985 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
986 | expire = ip6_rt_gc_timeout>>1; | |
987 | ||
988 | out: | |
989 | expire -= expire>>ip6_rt_gc_elasticity; | |
990 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); | |
991 | } | |
992 | ||
993 | /* Clean host part of a prefix. Not necessary in radix tree, | |
994 | but results in cleaner routing tables. | |
995 | ||
996 | Remove it only when all the things will work! | |
997 | */ | |
998 | ||
999 | static int ipv6_get_mtu(struct net_device *dev) | |
1000 | { | |
1001 | int mtu = IPV6_MIN_MTU; | |
1002 | struct inet6_dev *idev; | |
1003 | ||
1004 | idev = in6_dev_get(dev); | |
1005 | if (idev) { | |
1006 | mtu = idev->cnf.mtu6; | |
1007 | in6_dev_put(idev); | |
1008 | } | |
1009 | return mtu; | |
1010 | } | |
1011 | ||
1012 | int ipv6_get_hoplimit(struct net_device *dev) | |
1013 | { | |
1014 | int hoplimit = ipv6_devconf.hop_limit; | |
1015 | struct inet6_dev *idev; | |
1016 | ||
1017 | idev = in6_dev_get(dev); | |
1018 | if (idev) { | |
1019 | hoplimit = idev->cnf.hop_limit; | |
1020 | in6_dev_put(idev); | |
1021 | } | |
1022 | return hoplimit; | |
1023 | } | |
1024 | ||
1025 | /* | |
1026 | * | |
1027 | */ | |
1028 | ||
86872cb5 | 1029 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1030 | { |
1031 | int err; | |
1da177e4 LT |
1032 | struct rt6_info *rt = NULL; |
1033 | struct net_device *dev = NULL; | |
1034 | struct inet6_dev *idev = NULL; | |
c71099ac | 1035 | struct fib6_table *table; |
1da177e4 LT |
1036 | int addr_type; |
1037 | ||
86872cb5 | 1038 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1039 | return -EINVAL; |
1040 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1041 | if (cfg->fc_src_len) |
1da177e4 LT |
1042 | return -EINVAL; |
1043 | #endif | |
86872cb5 | 1044 | if (cfg->fc_ifindex) { |
1da177e4 | 1045 | err = -ENODEV; |
86872cb5 | 1046 | dev = dev_get_by_index(cfg->fc_ifindex); |
1da177e4 LT |
1047 | if (!dev) |
1048 | goto out; | |
1049 | idev = in6_dev_get(dev); | |
1050 | if (!idev) | |
1051 | goto out; | |
1052 | } | |
1053 | ||
86872cb5 TG |
1054 | if (cfg->fc_metric == 0) |
1055 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1056 | |
86872cb5 | 1057 | table = fib6_new_table(cfg->fc_table); |
c71099ac TG |
1058 | if (table == NULL) { |
1059 | err = -ENOBUFS; | |
1060 | goto out; | |
1061 | } | |
1062 | ||
1da177e4 LT |
1063 | rt = ip6_dst_alloc(); |
1064 | ||
1065 | if (rt == NULL) { | |
1066 | err = -ENOMEM; | |
1067 | goto out; | |
1068 | } | |
1069 | ||
1070 | rt->u.dst.obsolete = -1; | |
86872cb5 | 1071 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); |
1da177e4 | 1072 | |
86872cb5 TG |
1073 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1074 | cfg->fc_protocol = RTPROT_BOOT; | |
1075 | rt->rt6i_protocol = cfg->fc_protocol; | |
1076 | ||
1077 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1078 | |
1079 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1080 | rt->u.dst.input = ip6_mc_input; | |
1081 | else | |
1082 | rt->u.dst.input = ip6_forward; | |
1083 | ||
1084 | rt->u.dst.output = ip6_output; | |
1085 | ||
86872cb5 TG |
1086 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1087 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 LT |
1088 | if (rt->rt6i_dst.plen == 128) |
1089 | rt->u.dst.flags = DST_HOST; | |
1090 | ||
1091 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1092 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1093 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1094 | #endif |
1095 | ||
86872cb5 | 1096 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1097 | |
1098 | /* We cannot add true routes via loopback here, | |
1099 | they would result in kernel looping; promote them to reject routes | |
1100 | */ | |
86872cb5 | 1101 | if ((cfg->fc_flags & RTF_REJECT) || |
1da177e4 LT |
1102 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
1103 | /* hold loopback dev/idev if we haven't done so. */ | |
1104 | if (dev != &loopback_dev) { | |
1105 | if (dev) { | |
1106 | dev_put(dev); | |
1107 | in6_dev_put(idev); | |
1108 | } | |
1109 | dev = &loopback_dev; | |
1110 | dev_hold(dev); | |
1111 | idev = in6_dev_get(dev); | |
1112 | if (!idev) { | |
1113 | err = -ENODEV; | |
1114 | goto out; | |
1115 | } | |
1116 | } | |
1117 | rt->u.dst.output = ip6_pkt_discard_out; | |
1118 | rt->u.dst.input = ip6_pkt_discard; | |
1119 | rt->u.dst.error = -ENETUNREACH; | |
1120 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1121 | goto install_route; | |
1122 | } | |
1123 | ||
86872cb5 | 1124 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1125 | struct in6_addr *gw_addr; |
1126 | int gwa_type; | |
1127 | ||
86872cb5 TG |
1128 | gw_addr = &cfg->fc_gateway; |
1129 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1130 | gwa_type = ipv6_addr_type(gw_addr); |
1131 | ||
1132 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1133 | struct rt6_info *grt; | |
1134 | ||
1135 | /* IPv6 strictly inhibits using not link-local | |
1136 | addresses as nexthop address. | |
1137 | Otherwise, router will not able to send redirects. | |
1138 | It is very good, but in some (rare!) circumstances | |
1139 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1140 | some exceptions. --ANK | |
1141 | */ | |
1142 | err = -EINVAL; | |
1143 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1144 | goto out; | |
1145 | ||
86872cb5 | 1146 | grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1147 | |
1148 | err = -EHOSTUNREACH; | |
1149 | if (grt == NULL) | |
1150 | goto out; | |
1151 | if (dev) { | |
1152 | if (dev != grt->rt6i_dev) { | |
1153 | dst_release(&grt->u.dst); | |
1154 | goto out; | |
1155 | } | |
1156 | } else { | |
1157 | dev = grt->rt6i_dev; | |
1158 | idev = grt->rt6i_idev; | |
1159 | dev_hold(dev); | |
1160 | in6_dev_hold(grt->rt6i_idev); | |
1161 | } | |
1162 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1163 | err = 0; | |
1164 | dst_release(&grt->u.dst); | |
1165 | ||
1166 | if (err) | |
1167 | goto out; | |
1168 | } | |
1169 | err = -EINVAL; | |
1170 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1171 | goto out; | |
1172 | } | |
1173 | ||
1174 | err = -ENODEV; | |
1175 | if (dev == NULL) | |
1176 | goto out; | |
1177 | ||
86872cb5 | 1178 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1179 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1180 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1181 | err = PTR_ERR(rt->rt6i_nexthop); | |
1182 | rt->rt6i_nexthop = NULL; | |
1183 | goto out; | |
1184 | } | |
1185 | } | |
1186 | ||
86872cb5 | 1187 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1188 | |
1189 | install_route: | |
86872cb5 TG |
1190 | if (cfg->fc_mx) { |
1191 | struct nlattr *nla; | |
1192 | int remaining; | |
1193 | ||
1194 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1195 | int type = nla->nla_type; | |
1196 | ||
1197 | if (type) { | |
1198 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1199 | err = -EINVAL; |
1200 | goto out; | |
1201 | } | |
86872cb5 TG |
1202 | |
1203 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1da177e4 | 1204 | } |
1da177e4 LT |
1205 | } |
1206 | } | |
1207 | ||
1208 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1209 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1210 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1211 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1212 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1213 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1214 | rt->u.dst.dev = dev; | |
1215 | rt->rt6i_idev = idev; | |
c71099ac | 1216 | rt->rt6i_table = table; |
86872cb5 | 1217 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1218 | |
1219 | out: | |
1220 | if (dev) | |
1221 | dev_put(dev); | |
1222 | if (idev) | |
1223 | in6_dev_put(idev); | |
1224 | if (rt) | |
1225 | dst_free((struct dst_entry *) rt); | |
1226 | return err; | |
1227 | } | |
1228 | ||
86872cb5 | 1229 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1230 | { |
1231 | int err; | |
c71099ac | 1232 | struct fib6_table *table; |
1da177e4 | 1233 | |
6c813a72 PM |
1234 | if (rt == &ip6_null_entry) |
1235 | return -ENOENT; | |
1236 | ||
c71099ac TG |
1237 | table = rt->rt6i_table; |
1238 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1239 | |
86872cb5 | 1240 | err = fib6_del(rt, info); |
1da177e4 LT |
1241 | dst_release(&rt->u.dst); |
1242 | ||
c71099ac | 1243 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1244 | |
1245 | return err; | |
1246 | } | |
1247 | ||
e0a1ad73 TG |
1248 | int ip6_del_rt(struct rt6_info *rt) |
1249 | { | |
86872cb5 | 1250 | return __ip6_del_rt(rt, NULL); |
e0a1ad73 TG |
1251 | } |
1252 | ||
86872cb5 | 1253 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1254 | { |
c71099ac | 1255 | struct fib6_table *table; |
1da177e4 LT |
1256 | struct fib6_node *fn; |
1257 | struct rt6_info *rt; | |
1258 | int err = -ESRCH; | |
1259 | ||
86872cb5 | 1260 | table = fib6_get_table(cfg->fc_table); |
c71099ac TG |
1261 | if (table == NULL) |
1262 | return err; | |
1263 | ||
1264 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1265 | |
c71099ac | 1266 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1267 | &cfg->fc_dst, cfg->fc_dst_len, |
1268 | &cfg->fc_src, cfg->fc_src_len); | |
1da177e4 LT |
1269 | |
1270 | if (fn) { | |
1271 | for (rt = fn->leaf; rt; rt = rt->u.next) { | |
86872cb5 | 1272 | if (cfg->fc_ifindex && |
1da177e4 | 1273 | (rt->rt6i_dev == NULL || |
86872cb5 | 1274 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1275 | continue; |
86872cb5 TG |
1276 | if (cfg->fc_flags & RTF_GATEWAY && |
1277 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1278 | continue; |
86872cb5 | 1279 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 LT |
1280 | continue; |
1281 | dst_hold(&rt->u.dst); | |
c71099ac | 1282 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1283 | |
86872cb5 | 1284 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1285 | } |
1286 | } | |
c71099ac | 1287 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1288 | |
1289 | return err; | |
1290 | } | |
1291 | ||
1292 | /* | |
1293 | * Handle redirects | |
1294 | */ | |
a6279458 YH |
1295 | struct ip6rd_flowi { |
1296 | struct flowi fl; | |
1297 | struct in6_addr gateway; | |
1298 | }; | |
1299 | ||
1300 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1301 | struct flowi *fl, | |
1302 | int flags) | |
1da177e4 | 1303 | { |
a6279458 YH |
1304 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1305 | struct rt6_info *rt; | |
e843b9e1 | 1306 | struct fib6_node *fn; |
c71099ac | 1307 | |
1da177e4 | 1308 | /* |
e843b9e1 YH |
1309 | * Get the "current" route for this destination and |
1310 | * check if the redirect has come from approriate router. | |
1311 | * | |
1312 | * RFC 2461 specifies that redirects should only be | |
1313 | * accepted if they come from the nexthop to the target. | |
1314 | * Due to the way the routes are chosen, this notion | |
1315 | * is a bit fuzzy and one might need to check all possible | |
1316 | * routes. | |
1da177e4 | 1317 | */ |
1da177e4 | 1318 | |
c71099ac | 1319 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1320 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 YH |
1321 | restart: |
1322 | for (rt = fn->leaf; rt; rt = rt->u.next) { | |
1323 | /* | |
1324 | * Current route is on-link; redirect is always invalid. | |
1325 | * | |
1326 | * Seems, previous statement is not true. It could | |
1327 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1328 | * But then router serving it might decide, that we should | |
1329 | * know truth 8)8) --ANK (980726). | |
1330 | */ | |
1331 | if (rt6_check_expired(rt)) | |
1332 | continue; | |
1333 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1334 | continue; | |
a6279458 | 1335 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1336 | continue; |
a6279458 | 1337 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1338 | continue; |
1339 | break; | |
1340 | } | |
a6279458 | 1341 | |
cb15d9c2 | 1342 | if (!rt) |
a6279458 | 1343 | rt = &ip6_null_entry; |
cb15d9c2 YH |
1344 | BACKTRACK(&fl->fl6_src); |
1345 | out: | |
a6279458 YH |
1346 | dst_hold(&rt->u.dst); |
1347 | ||
c71099ac | 1348 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1349 | |
a6279458 YH |
1350 | return rt; |
1351 | }; | |
1352 | ||
1353 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1354 | struct in6_addr *src, | |
1355 | struct in6_addr *gateway, | |
1356 | struct net_device *dev) | |
1357 | { | |
adaa70bb | 1358 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
a6279458 YH |
1359 | struct ip6rd_flowi rdfl = { |
1360 | .fl = { | |
1361 | .oif = dev->ifindex, | |
1362 | .nl_u = { | |
1363 | .ip6_u = { | |
1364 | .daddr = *dest, | |
1365 | .saddr = *src, | |
1366 | }, | |
1367 | }, | |
1368 | }, | |
1369 | .gateway = *gateway, | |
1370 | }; | |
adaa70bb TG |
1371 | |
1372 | if (rt6_need_strict(dest)) | |
1373 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 YH |
1374 | |
1375 | return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect); | |
1376 | } | |
1377 | ||
1378 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1379 | struct in6_addr *saddr, | |
1380 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1381 | { | |
1382 | struct rt6_info *rt, *nrt = NULL; | |
1383 | struct netevent_redirect netevent; | |
1384 | ||
1385 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1386 | ||
1387 | if (rt == &ip6_null_entry) { | |
1da177e4 LT |
1388 | if (net_ratelimit()) |
1389 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1390 | "for redirect target\n"); | |
a6279458 | 1391 | goto out; |
1da177e4 LT |
1392 | } |
1393 | ||
1da177e4 LT |
1394 | /* |
1395 | * We have finally decided to accept it. | |
1396 | */ | |
1397 | ||
1398 | neigh_update(neigh, lladdr, NUD_STALE, | |
1399 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1400 | NEIGH_UPDATE_F_OVERRIDE| | |
1401 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1402 | NEIGH_UPDATE_F_ISROUTER)) | |
1403 | ); | |
1404 | ||
1405 | /* | |
1406 | * Redirect received -> path was valid. | |
1407 | * Look, redirects are sent only in response to data packets, | |
1408 | * so that this nexthop apparently is reachable. --ANK | |
1409 | */ | |
1410 | dst_confirm(&rt->u.dst); | |
1411 | ||
1412 | /* Duplicate redirect: silently ignore. */ | |
1413 | if (neigh == rt->u.dst.neighbour) | |
1414 | goto out; | |
1415 | ||
1416 | nrt = ip6_rt_copy(rt); | |
1417 | if (nrt == NULL) | |
1418 | goto out; | |
1419 | ||
1420 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1421 | if (on_link) | |
1422 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1423 | ||
1424 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1425 | nrt->rt6i_dst.plen = 128; | |
1426 | nrt->u.dst.flags |= DST_HOST; | |
1427 | ||
1428 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1429 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1430 | /* Reset pmtu, it may be better */ | |
1431 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1432 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1433 | ||
40e22e8f | 1434 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1435 | goto out; |
1436 | ||
8d71740c TT |
1437 | netevent.old = &rt->u.dst; |
1438 | netevent.new = &nrt->u.dst; | |
1439 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1440 | ||
1da177e4 | 1441 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1442 | ip6_del_rt(rt); |
1da177e4 LT |
1443 | return; |
1444 | } | |
1445 | ||
1446 | out: | |
1447 | dst_release(&rt->u.dst); | |
1448 | return; | |
1449 | } | |
1450 | ||
1451 | /* | |
1452 | * Handle ICMP "packet too big" messages | |
1453 | * i.e. Path MTU discovery | |
1454 | */ | |
1455 | ||
1456 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1457 | struct net_device *dev, u32 pmtu) | |
1458 | { | |
1459 | struct rt6_info *rt, *nrt; | |
1460 | int allfrag = 0; | |
1461 | ||
1462 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1463 | if (rt == NULL) | |
1464 | return; | |
1465 | ||
1466 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1467 | goto out; | |
1468 | ||
1469 | if (pmtu < IPV6_MIN_MTU) { | |
1470 | /* | |
1471 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link | |
1472 | * MTU (1280) and a fragment header should always be included | |
1473 | * after a node receiving Too Big message reporting PMTU is | |
1474 | * less than the IPv6 Minimum Link MTU. | |
1475 | */ | |
1476 | pmtu = IPV6_MIN_MTU; | |
1477 | allfrag = 1; | |
1478 | } | |
1479 | ||
1480 | /* New mtu received -> path was valid. | |
1481 | They are sent only in response to data packets, | |
1482 | so that this nexthop apparently is reachable. --ANK | |
1483 | */ | |
1484 | dst_confirm(&rt->u.dst); | |
1485 | ||
1486 | /* Host route. If it is static, it would be better | |
1487 | not to override it, but add new one, so that | |
1488 | when cache entry will expire old pmtu | |
1489 | would return automatically. | |
1490 | */ | |
1491 | if (rt->rt6i_flags & RTF_CACHE) { | |
1492 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1493 | if (allfrag) | |
1494 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1495 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); | |
1496 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; | |
1497 | goto out; | |
1498 | } | |
1499 | ||
1500 | /* Network route. | |
1501 | Two cases are possible: | |
1502 | 1. It is connected route. Action: COW | |
1503 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1504 | */ | |
d5315b50 | 1505 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1506 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1507 | else |
1508 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1509 | |
d5315b50 | 1510 | if (nrt) { |
a1e78363 YH |
1511 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
1512 | if (allfrag) | |
1513 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1514 | ||
1515 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1516 | * happened within 5 mins, the recommended timer is 10 mins. | |
1517 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1518 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1519 | * and detecting PMTU increase will be automatically happened. | |
1520 | */ | |
1521 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); | |
1522 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; | |
1523 | ||
40e22e8f | 1524 | ip6_ins_rt(nrt); |
1da177e4 | 1525 | } |
1da177e4 LT |
1526 | out: |
1527 | dst_release(&rt->u.dst); | |
1528 | } | |
1529 | ||
1530 | /* | |
1531 | * Misc support functions | |
1532 | */ | |
1533 | ||
1534 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1535 | { | |
1536 | struct rt6_info *rt = ip6_dst_alloc(); | |
1537 | ||
1538 | if (rt) { | |
1539 | rt->u.dst.input = ort->u.dst.input; | |
1540 | rt->u.dst.output = ort->u.dst.output; | |
1541 | ||
1542 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
1543 | rt->u.dst.dev = ort->u.dst.dev; | |
1544 | if (rt->u.dst.dev) | |
1545 | dev_hold(rt->u.dst.dev); | |
1546 | rt->rt6i_idev = ort->rt6i_idev; | |
1547 | if (rt->rt6i_idev) | |
1548 | in6_dev_hold(rt->rt6i_idev); | |
1549 | rt->u.dst.lastuse = jiffies; | |
1550 | rt->rt6i_expires = 0; | |
1551 | ||
1552 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1553 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1554 | rt->rt6i_metric = 0; | |
1555 | ||
1556 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1557 | #ifdef CONFIG_IPV6_SUBTREES | |
1558 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1559 | #endif | |
c71099ac | 1560 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1561 | } |
1562 | return rt; | |
1563 | } | |
1564 | ||
70ceb4f5 YH |
1565 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1566 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1567 | struct in6_addr *gwaddr, int ifindex) | |
1568 | { | |
1569 | struct fib6_node *fn; | |
1570 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1571 | struct fib6_table *table; |
1572 | ||
1573 | table = fib6_get_table(RT6_TABLE_INFO); | |
1574 | if (table == NULL) | |
1575 | return NULL; | |
70ceb4f5 | 1576 | |
c71099ac TG |
1577 | write_lock_bh(&table->tb6_lock); |
1578 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1579 | if (!fn) |
1580 | goto out; | |
1581 | ||
1582 | for (rt = fn->leaf; rt; rt = rt->u.next) { | |
1583 | if (rt->rt6i_dev->ifindex != ifindex) | |
1584 | continue; | |
1585 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1586 | continue; | |
1587 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1588 | continue; | |
1589 | dst_hold(&rt->u.dst); | |
1590 | break; | |
1591 | } | |
1592 | out: | |
c71099ac | 1593 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1594 | return rt; |
1595 | } | |
1596 | ||
1597 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1598 | struct in6_addr *gwaddr, int ifindex, | |
1599 | unsigned pref) | |
1600 | { | |
86872cb5 TG |
1601 | struct fib6_config cfg = { |
1602 | .fc_table = RT6_TABLE_INFO, | |
1603 | .fc_metric = 1024, | |
1604 | .fc_ifindex = ifindex, | |
1605 | .fc_dst_len = prefixlen, | |
1606 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1607 | RTF_UP | RTF_PREF(pref), | |
1608 | }; | |
1609 | ||
1610 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1611 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1612 | |
e317da96 YH |
1613 | /* We should treat it as a default route if prefix length is 0. */ |
1614 | if (!prefixlen) | |
86872cb5 | 1615 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1616 | |
86872cb5 | 1617 | ip6_route_add(&cfg); |
70ceb4f5 YH |
1618 | |
1619 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1620 | } | |
1621 | #endif | |
1622 | ||
1da177e4 LT |
1623 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1624 | { | |
1625 | struct rt6_info *rt; | |
c71099ac | 1626 | struct fib6_table *table; |
1da177e4 | 1627 | |
c71099ac TG |
1628 | table = fib6_get_table(RT6_TABLE_DFLT); |
1629 | if (table == NULL) | |
1630 | return NULL; | |
1da177e4 | 1631 | |
c71099ac TG |
1632 | write_lock_bh(&table->tb6_lock); |
1633 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.next) { | |
1da177e4 | 1634 | if (dev == rt->rt6i_dev && |
045927ff | 1635 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1636 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1637 | break; | |
1638 | } | |
1639 | if (rt) | |
1640 | dst_hold(&rt->u.dst); | |
c71099ac | 1641 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1642 | return rt; |
1643 | } | |
1644 | ||
1645 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1646 | struct net_device *dev, |
1647 | unsigned int pref) | |
1da177e4 | 1648 | { |
86872cb5 TG |
1649 | struct fib6_config cfg = { |
1650 | .fc_table = RT6_TABLE_DFLT, | |
1651 | .fc_metric = 1024, | |
1652 | .fc_ifindex = dev->ifindex, | |
1653 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1654 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
1655 | }; | |
1da177e4 | 1656 | |
86872cb5 | 1657 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1658 | |
86872cb5 | 1659 | ip6_route_add(&cfg); |
1da177e4 | 1660 | |
1da177e4 LT |
1661 | return rt6_get_dflt_router(gwaddr, dev); |
1662 | } | |
1663 | ||
1664 | void rt6_purge_dflt_routers(void) | |
1665 | { | |
1666 | struct rt6_info *rt; | |
c71099ac TG |
1667 | struct fib6_table *table; |
1668 | ||
1669 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
1670 | table = fib6_get_table(RT6_TABLE_DFLT); | |
1671 | if (table == NULL) | |
1672 | return; | |
1da177e4 LT |
1673 | |
1674 | restart: | |
c71099ac TG |
1675 | read_lock_bh(&table->tb6_lock); |
1676 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.next) { | |
1da177e4 LT |
1677 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
1678 | dst_hold(&rt->u.dst); | |
c71099ac | 1679 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1680 | ip6_del_rt(rt); |
1da177e4 LT |
1681 | goto restart; |
1682 | } | |
1683 | } | |
c71099ac | 1684 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1685 | } |
1686 | ||
86872cb5 TG |
1687 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, |
1688 | struct fib6_config *cfg) | |
1689 | { | |
1690 | memset(cfg, 0, sizeof(*cfg)); | |
1691 | ||
1692 | cfg->fc_table = RT6_TABLE_MAIN; | |
1693 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1694 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1695 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1696 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1697 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1698 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1699 | ||
1700 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); | |
1701 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1702 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1703 | } | |
1704 | ||
1da177e4 LT |
1705 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
1706 | { | |
86872cb5 | 1707 | struct fib6_config cfg; |
1da177e4 LT |
1708 | struct in6_rtmsg rtmsg; |
1709 | int err; | |
1710 | ||
1711 | switch(cmd) { | |
1712 | case SIOCADDRT: /* Add a route */ | |
1713 | case SIOCDELRT: /* Delete a route */ | |
1714 | if (!capable(CAP_NET_ADMIN)) | |
1715 | return -EPERM; | |
1716 | err = copy_from_user(&rtmsg, arg, | |
1717 | sizeof(struct in6_rtmsg)); | |
1718 | if (err) | |
1719 | return -EFAULT; | |
86872cb5 TG |
1720 | |
1721 | rtmsg_to_fib6_config(&rtmsg, &cfg); | |
1722 | ||
1da177e4 LT |
1723 | rtnl_lock(); |
1724 | switch (cmd) { | |
1725 | case SIOCADDRT: | |
86872cb5 | 1726 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1727 | break; |
1728 | case SIOCDELRT: | |
86872cb5 | 1729 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1730 | break; |
1731 | default: | |
1732 | err = -EINVAL; | |
1733 | } | |
1734 | rtnl_unlock(); | |
1735 | ||
1736 | return err; | |
1737 | }; | |
1738 | ||
1739 | return -EINVAL; | |
1740 | } | |
1741 | ||
1742 | /* | |
1743 | * Drop the packet on the floor | |
1744 | */ | |
1745 | ||
20380731 | 1746 | static int ip6_pkt_discard(struct sk_buff *skb) |
1da177e4 | 1747 | { |
76d0cc1b LL |
1748 | int type = ipv6_addr_type(&skb->nh.ipv6h->daddr); |
1749 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) | |
1750 | IP6_INC_STATS(IPSTATS_MIB_INADDRERRORS); | |
1751 | ||
1da177e4 LT |
1752 | IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES); |
1753 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev); | |
1754 | kfree_skb(skb); | |
1755 | return 0; | |
1756 | } | |
1757 | ||
20380731 | 1758 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 LT |
1759 | { |
1760 | skb->dev = skb->dst->dev; | |
1761 | return ip6_pkt_discard(skb); | |
1762 | } | |
1763 | ||
1764 | /* | |
1765 | * Allocate a dst for local (unicast / anycast) address. | |
1766 | */ | |
1767 | ||
1768 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1769 | const struct in6_addr *addr, | |
1770 | int anycast) | |
1771 | { | |
1772 | struct rt6_info *rt = ip6_dst_alloc(); | |
1773 | ||
1774 | if (rt == NULL) | |
1775 | return ERR_PTR(-ENOMEM); | |
1776 | ||
1777 | dev_hold(&loopback_dev); | |
1778 | in6_dev_hold(idev); | |
1779 | ||
1780 | rt->u.dst.flags = DST_HOST; | |
1781 | rt->u.dst.input = ip6_input; | |
1782 | rt->u.dst.output = ip6_output; | |
1783 | rt->rt6i_dev = &loopback_dev; | |
1784 | rt->rt6i_idev = idev; | |
1785 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1786 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1787 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1788 | rt->u.dst.obsolete = -1; | |
1789 | ||
1790 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
1791 | if (anycast) |
1792 | rt->rt6i_flags |= RTF_ANYCAST; | |
1793 | else | |
1da177e4 LT |
1794 | rt->rt6i_flags |= RTF_LOCAL; |
1795 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1796 | if (rt->rt6i_nexthop == NULL) { | |
1797 | dst_free((struct dst_entry *) rt); | |
1798 | return ERR_PTR(-ENOMEM); | |
1799 | } | |
1800 | ||
1801 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1802 | rt->rt6i_dst.plen = 128; | |
c71099ac | 1803 | rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL); |
1da177e4 LT |
1804 | |
1805 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1806 | ||
1807 | return rt; | |
1808 | } | |
1809 | ||
1810 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1811 | { | |
1812 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1813 | rt != &ip6_null_entry) { | |
1814 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1815 | return -1; | |
1816 | } | |
1817 | return 0; | |
1818 | } | |
1819 | ||
1820 | void rt6_ifdown(struct net_device *dev) | |
1821 | { | |
c71099ac | 1822 | fib6_clean_all(fib6_ifdown, 0, dev); |
1da177e4 LT |
1823 | } |
1824 | ||
1825 | struct rt6_mtu_change_arg | |
1826 | { | |
1827 | struct net_device *dev; | |
1828 | unsigned mtu; | |
1829 | }; | |
1830 | ||
1831 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1832 | { | |
1833 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1834 | struct inet6_dev *idev; | |
1835 | ||
1836 | /* In IPv6 pmtu discovery is not optional, | |
1837 | so that RTAX_MTU lock cannot disable it. | |
1838 | We still use this lock to block changes | |
1839 | caused by addrconf/ndisc. | |
1840 | */ | |
1841 | ||
1842 | idev = __in6_dev_get(arg->dev); | |
1843 | if (idev == NULL) | |
1844 | return 0; | |
1845 | ||
1846 | /* For administrative MTU increase, there is no way to discover | |
1847 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1848 | Since RFC 1981 doesn't include administrative MTU increase | |
1849 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1850 | */ | |
1851 | /* | |
1852 | If new MTU is less than route PMTU, this new MTU will be the | |
1853 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1854 | decreases; if new MTU is greater than route PMTU, and the | |
1855 | old MTU is the lowest MTU in the path, update the route PMTU | |
1856 | to reflect the increase. In this case if the other nodes' MTU | |
1857 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1858 | PMTU discouvery. | |
1859 | */ | |
1860 | if (rt->rt6i_dev == arg->dev && | |
1861 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
1862 | (dst_mtu(&rt->u.dst) > arg->mtu || | |
1863 | (dst_mtu(&rt->u.dst) < arg->mtu && | |
1864 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) | |
1865 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; | |
1866 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); | |
1867 | return 0; | |
1868 | } | |
1869 | ||
1870 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1871 | { | |
c71099ac TG |
1872 | struct rt6_mtu_change_arg arg = { |
1873 | .dev = dev, | |
1874 | .mtu = mtu, | |
1875 | }; | |
1da177e4 | 1876 | |
c71099ac | 1877 | fib6_clean_all(rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
1878 | } |
1879 | ||
86872cb5 | 1880 | static struct nla_policy rtm_ipv6_policy[RTA_MAX+1] __read_mostly = { |
5176f91e | 1881 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 1882 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 1883 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
1884 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
1885 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1886 | }; | |
1887 | ||
1888 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1889 | struct fib6_config *cfg) | |
1da177e4 | 1890 | { |
86872cb5 TG |
1891 | struct rtmsg *rtm; |
1892 | struct nlattr *tb[RTA_MAX+1]; | |
1893 | int err; | |
1da177e4 | 1894 | |
86872cb5 TG |
1895 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
1896 | if (err < 0) | |
1897 | goto errout; | |
1da177e4 | 1898 | |
86872cb5 TG |
1899 | err = -EINVAL; |
1900 | rtm = nlmsg_data(nlh); | |
1901 | memset(cfg, 0, sizeof(*cfg)); | |
1902 | ||
1903 | cfg->fc_table = rtm->rtm_table; | |
1904 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
1905 | cfg->fc_src_len = rtm->rtm_src_len; | |
1906 | cfg->fc_flags = RTF_UP; | |
1907 | cfg->fc_protocol = rtm->rtm_protocol; | |
1908 | ||
1909 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
1910 | cfg->fc_flags |= RTF_REJECT; | |
1911 | ||
1912 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
1913 | cfg->fc_nlinfo.nlh = nlh; | |
1914 | ||
1915 | if (tb[RTA_GATEWAY]) { | |
1916 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
1917 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 1918 | } |
86872cb5 TG |
1919 | |
1920 | if (tb[RTA_DST]) { | |
1921 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
1922 | ||
1923 | if (nla_len(tb[RTA_DST]) < plen) | |
1924 | goto errout; | |
1925 | ||
1926 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 1927 | } |
86872cb5 TG |
1928 | |
1929 | if (tb[RTA_SRC]) { | |
1930 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
1931 | ||
1932 | if (nla_len(tb[RTA_SRC]) < plen) | |
1933 | goto errout; | |
1934 | ||
1935 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 1936 | } |
86872cb5 TG |
1937 | |
1938 | if (tb[RTA_OIF]) | |
1939 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
1940 | ||
1941 | if (tb[RTA_PRIORITY]) | |
1942 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
1943 | ||
1944 | if (tb[RTA_METRICS]) { | |
1945 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
1946 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 1947 | } |
86872cb5 TG |
1948 | |
1949 | if (tb[RTA_TABLE]) | |
1950 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
1951 | ||
1952 | err = 0; | |
1953 | errout: | |
1954 | return err; | |
1da177e4 LT |
1955 | } |
1956 | ||
1957 | int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
1958 | { | |
86872cb5 TG |
1959 | struct fib6_config cfg; |
1960 | int err; | |
1da177e4 | 1961 | |
86872cb5 TG |
1962 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
1963 | if (err < 0) | |
1964 | return err; | |
1965 | ||
1966 | return ip6_route_del(&cfg); | |
1da177e4 LT |
1967 | } |
1968 | ||
1969 | int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
1970 | { | |
86872cb5 TG |
1971 | struct fib6_config cfg; |
1972 | int err; | |
1da177e4 | 1973 | |
86872cb5 TG |
1974 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
1975 | if (err < 0) | |
1976 | return err; | |
1977 | ||
1978 | return ip6_route_add(&cfg); | |
1da177e4 LT |
1979 | } |
1980 | ||
1da177e4 | 1981 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
0d51aa80 JHS |
1982 | struct in6_addr *dst, struct in6_addr *src, |
1983 | int iif, int type, u32 pid, u32 seq, | |
1984 | int prefix, unsigned int flags) | |
1da177e4 LT |
1985 | { |
1986 | struct rtmsg *rtm; | |
2d7202bf | 1987 | struct nlmsghdr *nlh; |
1da177e4 | 1988 | struct rta_cacheinfo ci; |
9e762a4a | 1989 | u32 table; |
1da177e4 LT |
1990 | |
1991 | if (prefix) { /* user wants prefix routes only */ | |
1992 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
1993 | /* success since this is not a prefix route */ | |
1994 | return 1; | |
1995 | } | |
1996 | } | |
1997 | ||
2d7202bf TG |
1998 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
1999 | if (nlh == NULL) | |
2000 | return -ENOBUFS; | |
2001 | ||
2002 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2003 | rtm->rtm_family = AF_INET6; |
2004 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2005 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2006 | rtm->rtm_tos = 0; | |
c71099ac | 2007 | if (rt->rt6i_table) |
9e762a4a | 2008 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2009 | else |
9e762a4a PM |
2010 | table = RT6_TABLE_UNSPEC; |
2011 | rtm->rtm_table = table; | |
2d7202bf | 2012 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2013 | if (rt->rt6i_flags&RTF_REJECT) |
2014 | rtm->rtm_type = RTN_UNREACHABLE; | |
2015 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2016 | rtm->rtm_type = RTN_LOCAL; | |
2017 | else | |
2018 | rtm->rtm_type = RTN_UNICAST; | |
2019 | rtm->rtm_flags = 0; | |
2020 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2021 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2022 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2023 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2024 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2025 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2026 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2027 | rtm->rtm_protocol = RTPROT_RA; | |
2028 | ||
2029 | if (rt->rt6i_flags&RTF_CACHE) | |
2030 | rtm->rtm_flags |= RTM_F_CLONED; | |
2031 | ||
2032 | if (dst) { | |
2d7202bf | 2033 | NLA_PUT(skb, RTA_DST, 16, dst); |
1da177e4 LT |
2034 | rtm->rtm_dst_len = 128; |
2035 | } else if (rtm->rtm_dst_len) | |
2d7202bf | 2036 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2037 | #ifdef CONFIG_IPV6_SUBTREES |
2038 | if (src) { | |
2d7202bf | 2039 | NLA_PUT(skb, RTA_SRC, 16, src); |
1da177e4 LT |
2040 | rtm->rtm_src_len = 128; |
2041 | } else if (rtm->rtm_src_len) | |
2d7202bf | 2042 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 LT |
2043 | #endif |
2044 | if (iif) | |
2d7202bf | 2045 | NLA_PUT_U32(skb, RTA_IIF, iif); |
1da177e4 LT |
2046 | else if (dst) { |
2047 | struct in6_addr saddr_buf; | |
2048 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) | |
2d7202bf | 2049 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2050 | } |
2d7202bf | 2051 | |
1da177e4 | 2052 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
2d7202bf TG |
2053 | goto nla_put_failure; |
2054 | ||
1da177e4 | 2055 | if (rt->u.dst.neighbour) |
2d7202bf TG |
2056 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
2057 | ||
1da177e4 | 2058 | if (rt->u.dst.dev) |
2d7202bf TG |
2059 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2060 | ||
2061 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
1da177e4 LT |
2062 | ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse); |
2063 | if (rt->rt6i_expires) | |
2064 | ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies); | |
2065 | else | |
2066 | ci.rta_expires = 0; | |
2067 | ci.rta_used = rt->u.dst.__use; | |
2068 | ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt); | |
2069 | ci.rta_error = rt->u.dst.error; | |
2070 | ci.rta_id = 0; | |
2071 | ci.rta_ts = 0; | |
2072 | ci.rta_tsage = 0; | |
2d7202bf TG |
2073 | NLA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci); |
2074 | ||
2075 | return nlmsg_end(skb, nlh); | |
2076 | ||
2077 | nla_put_failure: | |
2078 | return nlmsg_cancel(skb, nlh); | |
1da177e4 LT |
2079 | } |
2080 | ||
1b43af54 | 2081 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2082 | { |
2083 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2084 | int prefix; | |
2085 | ||
2d7202bf TG |
2086 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2087 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2088 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2089 | } else | |
2090 | prefix = 0; | |
2091 | ||
2092 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2093 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
0d51aa80 | 2094 | prefix, NLM_F_MULTI); |
1da177e4 LT |
2095 | } |
2096 | ||
1da177e4 LT |
2097 | int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
2098 | { | |
ab364a6f TG |
2099 | struct nlattr *tb[RTA_MAX+1]; |
2100 | struct rt6_info *rt; | |
1da177e4 | 2101 | struct sk_buff *skb; |
ab364a6f | 2102 | struct rtmsg *rtm; |
1da177e4 | 2103 | struct flowi fl; |
ab364a6f | 2104 | int err, iif = 0; |
1da177e4 | 2105 | |
ab364a6f TG |
2106 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2107 | if (err < 0) | |
2108 | goto errout; | |
1da177e4 | 2109 | |
ab364a6f | 2110 | err = -EINVAL; |
1da177e4 | 2111 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2112 | |
ab364a6f TG |
2113 | if (tb[RTA_SRC]) { |
2114 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2115 | goto errout; | |
2116 | ||
2117 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2118 | } | |
2119 | ||
2120 | if (tb[RTA_DST]) { | |
2121 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2122 | goto errout; | |
2123 | ||
2124 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2125 | } | |
2126 | ||
2127 | if (tb[RTA_IIF]) | |
2128 | iif = nla_get_u32(tb[RTA_IIF]); | |
2129 | ||
2130 | if (tb[RTA_OIF]) | |
2131 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2132 | |
2133 | if (iif) { | |
2134 | struct net_device *dev; | |
2135 | dev = __dev_get_by_index(iif); | |
2136 | if (!dev) { | |
2137 | err = -ENODEV; | |
ab364a6f | 2138 | goto errout; |
1da177e4 LT |
2139 | } |
2140 | } | |
2141 | ||
ab364a6f TG |
2142 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2143 | if (skb == NULL) { | |
2144 | err = -ENOBUFS; | |
2145 | goto errout; | |
2146 | } | |
1da177e4 | 2147 | |
ab364a6f TG |
2148 | /* Reserve room for dummy headers, this skb can pass |
2149 | through good chunk of routing engine. | |
2150 | */ | |
2151 | skb->mac.raw = skb->data; | |
2152 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); | |
1da177e4 | 2153 | |
ab364a6f | 2154 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); |
1da177e4 LT |
2155 | skb->dst = &rt->u.dst; |
2156 | ||
ab364a6f | 2157 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2158 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
0d51aa80 | 2159 | nlh->nlmsg_seq, 0, 0); |
1da177e4 | 2160 | if (err < 0) { |
ab364a6f TG |
2161 | kfree_skb(skb); |
2162 | goto errout; | |
1da177e4 LT |
2163 | } |
2164 | ||
2942e900 | 2165 | err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); |
ab364a6f | 2166 | errout: |
1da177e4 | 2167 | return err; |
1da177e4 LT |
2168 | } |
2169 | ||
86872cb5 | 2170 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2171 | { |
2172 | struct sk_buff *skb; | |
86872cb5 TG |
2173 | u32 pid = 0, seq = 0; |
2174 | struct nlmsghdr *nlh = NULL; | |
21713ebc TG |
2175 | int payload = sizeof(struct rtmsg) + 256; |
2176 | int err = -ENOBUFS; | |
2177 | ||
86872cb5 TG |
2178 | if (info) { |
2179 | pid = info->pid; | |
2180 | nlh = info->nlh; | |
2181 | if (nlh) | |
2182 | seq = nlh->nlmsg_seq; | |
2183 | } | |
2184 | ||
21713ebc TG |
2185 | skb = nlmsg_new(nlmsg_total_size(payload), gfp_any()); |
2186 | if (skb == NULL) | |
2187 | goto errout; | |
2188 | ||
2189 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0); | |
2190 | if (err < 0) { | |
1da177e4 | 2191 | kfree_skb(skb); |
21713ebc | 2192 | goto errout; |
1da177e4 | 2193 | } |
21713ebc TG |
2194 | |
2195 | err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any()); | |
2196 | errout: | |
2197 | if (err < 0) | |
2198 | rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err); | |
1da177e4 LT |
2199 | } |
2200 | ||
2201 | /* | |
2202 | * /proc | |
2203 | */ | |
2204 | ||
2205 | #ifdef CONFIG_PROC_FS | |
2206 | ||
2207 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2208 | ||
2209 | struct rt6_proc_arg | |
2210 | { | |
2211 | char *buffer; | |
2212 | int offset; | |
2213 | int length; | |
2214 | int skip; | |
2215 | int len; | |
2216 | }; | |
2217 | ||
2218 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2219 | { | |
2220 | struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg; | |
2221 | int i; | |
2222 | ||
2223 | if (arg->skip < arg->offset / RT6_INFO_LEN) { | |
2224 | arg->skip++; | |
2225 | return 0; | |
2226 | } | |
2227 | ||
2228 | if (arg->len >= arg->length) | |
2229 | return 0; | |
2230 | ||
2231 | for (i=0; i<16; i++) { | |
2232 | sprintf(arg->buffer + arg->len, "%02x", | |
2233 | rt->rt6i_dst.addr.s6_addr[i]); | |
2234 | arg->len += 2; | |
2235 | } | |
2236 | arg->len += sprintf(arg->buffer + arg->len, " %02x ", | |
2237 | rt->rt6i_dst.plen); | |
2238 | ||
2239 | #ifdef CONFIG_IPV6_SUBTREES | |
2240 | for (i=0; i<16; i++) { | |
2241 | sprintf(arg->buffer + arg->len, "%02x", | |
2242 | rt->rt6i_src.addr.s6_addr[i]); | |
2243 | arg->len += 2; | |
2244 | } | |
2245 | arg->len += sprintf(arg->buffer + arg->len, " %02x ", | |
2246 | rt->rt6i_src.plen); | |
2247 | #else | |
2248 | sprintf(arg->buffer + arg->len, | |
2249 | "00000000000000000000000000000000 00 "); | |
2250 | arg->len += 36; | |
2251 | #endif | |
2252 | ||
2253 | if (rt->rt6i_nexthop) { | |
2254 | for (i=0; i<16; i++) { | |
2255 | sprintf(arg->buffer + arg->len, "%02x", | |
2256 | rt->rt6i_nexthop->primary_key[i]); | |
2257 | arg->len += 2; | |
2258 | } | |
2259 | } else { | |
2260 | sprintf(arg->buffer + arg->len, | |
2261 | "00000000000000000000000000000000"); | |
2262 | arg->len += 32; | |
2263 | } | |
2264 | arg->len += sprintf(arg->buffer + arg->len, | |
2265 | " %08x %08x %08x %08x %8s\n", | |
2266 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2267 | rt->u.dst.__use, rt->rt6i_flags, | |
2268 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
2269 | return 0; | |
2270 | } | |
2271 | ||
2272 | static int rt6_proc_info(char *buffer, char **start, off_t offset, int length) | |
2273 | { | |
c71099ac TG |
2274 | struct rt6_proc_arg arg = { |
2275 | .buffer = buffer, | |
2276 | .offset = offset, | |
2277 | .length = length, | |
2278 | }; | |
1da177e4 | 2279 | |
c71099ac | 2280 | fib6_clean_all(rt6_info_route, 0, &arg); |
1da177e4 LT |
2281 | |
2282 | *start = buffer; | |
2283 | if (offset) | |
2284 | *start += offset % RT6_INFO_LEN; | |
2285 | ||
2286 | arg.len -= offset % RT6_INFO_LEN; | |
2287 | ||
2288 | if (arg.len > length) | |
2289 | arg.len = length; | |
2290 | if (arg.len < 0) | |
2291 | arg.len = 0; | |
2292 | ||
2293 | return arg.len; | |
2294 | } | |
2295 | ||
1da177e4 LT |
2296 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2297 | { | |
2298 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
2299 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
2300 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
2301 | rt6_stats.fib_rt_cache, | |
2302 | atomic_read(&ip6_dst_ops.entries), | |
2303 | rt6_stats.fib_discarded_routes); | |
2304 | ||
2305 | return 0; | |
2306 | } | |
2307 | ||
2308 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2309 | { | |
2310 | return single_open(file, rt6_stats_seq_show, NULL); | |
2311 | } | |
2312 | ||
2313 | static struct file_operations rt6_stats_seq_fops = { | |
2314 | .owner = THIS_MODULE, | |
2315 | .open = rt6_stats_seq_open, | |
2316 | .read = seq_read, | |
2317 | .llseek = seq_lseek, | |
2318 | .release = single_release, | |
2319 | }; | |
2320 | #endif /* CONFIG_PROC_FS */ | |
2321 | ||
2322 | #ifdef CONFIG_SYSCTL | |
2323 | ||
2324 | static int flush_delay; | |
2325 | ||
2326 | static | |
2327 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2328 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2329 | { | |
2330 | if (write) { | |
2331 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2332 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); | |
2333 | return 0; | |
2334 | } else | |
2335 | return -EINVAL; | |
2336 | } | |
2337 | ||
2338 | ctl_table ipv6_route_table[] = { | |
2339 | { | |
2340 | .ctl_name = NET_IPV6_ROUTE_FLUSH, | |
2341 | .procname = "flush", | |
2342 | .data = &flush_delay, | |
2343 | .maxlen = sizeof(int), | |
89c8b3a1 | 2344 | .mode = 0200, |
1da177e4 LT |
2345 | .proc_handler = &ipv6_sysctl_rtcache_flush |
2346 | }, | |
2347 | { | |
2348 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2349 | .procname = "gc_thresh", | |
2350 | .data = &ip6_dst_ops.gc_thresh, | |
2351 | .maxlen = sizeof(int), | |
2352 | .mode = 0644, | |
2353 | .proc_handler = &proc_dointvec, | |
2354 | }, | |
2355 | { | |
2356 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2357 | .procname = "max_size", | |
2358 | .data = &ip6_rt_max_size, | |
2359 | .maxlen = sizeof(int), | |
2360 | .mode = 0644, | |
2361 | .proc_handler = &proc_dointvec, | |
2362 | }, | |
2363 | { | |
2364 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2365 | .procname = "gc_min_interval", | |
2366 | .data = &ip6_rt_gc_min_interval, | |
2367 | .maxlen = sizeof(int), | |
2368 | .mode = 0644, | |
2369 | .proc_handler = &proc_dointvec_jiffies, | |
2370 | .strategy = &sysctl_jiffies, | |
2371 | }, | |
2372 | { | |
2373 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2374 | .procname = "gc_timeout", | |
2375 | .data = &ip6_rt_gc_timeout, | |
2376 | .maxlen = sizeof(int), | |
2377 | .mode = 0644, | |
2378 | .proc_handler = &proc_dointvec_jiffies, | |
2379 | .strategy = &sysctl_jiffies, | |
2380 | }, | |
2381 | { | |
2382 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2383 | .procname = "gc_interval", | |
2384 | .data = &ip6_rt_gc_interval, | |
2385 | .maxlen = sizeof(int), | |
2386 | .mode = 0644, | |
2387 | .proc_handler = &proc_dointvec_jiffies, | |
2388 | .strategy = &sysctl_jiffies, | |
2389 | }, | |
2390 | { | |
2391 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2392 | .procname = "gc_elasticity", | |
2393 | .data = &ip6_rt_gc_elasticity, | |
2394 | .maxlen = sizeof(int), | |
2395 | .mode = 0644, | |
2396 | .proc_handler = &proc_dointvec_jiffies, | |
2397 | .strategy = &sysctl_jiffies, | |
2398 | }, | |
2399 | { | |
2400 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2401 | .procname = "mtu_expires", | |
2402 | .data = &ip6_rt_mtu_expires, | |
2403 | .maxlen = sizeof(int), | |
2404 | .mode = 0644, | |
2405 | .proc_handler = &proc_dointvec_jiffies, | |
2406 | .strategy = &sysctl_jiffies, | |
2407 | }, | |
2408 | { | |
2409 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2410 | .procname = "min_adv_mss", | |
2411 | .data = &ip6_rt_min_advmss, | |
2412 | .maxlen = sizeof(int), | |
2413 | .mode = 0644, | |
2414 | .proc_handler = &proc_dointvec_jiffies, | |
2415 | .strategy = &sysctl_jiffies, | |
2416 | }, | |
2417 | { | |
2418 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2419 | .procname = "gc_min_interval_ms", | |
2420 | .data = &ip6_rt_gc_min_interval, | |
2421 | .maxlen = sizeof(int), | |
2422 | .mode = 0644, | |
2423 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2424 | .strategy = &sysctl_ms_jiffies, | |
2425 | }, | |
2426 | { .ctl_name = 0 } | |
2427 | }; | |
2428 | ||
2429 | #endif | |
2430 | ||
2431 | void __init ip6_route_init(void) | |
2432 | { | |
2433 | struct proc_dir_entry *p; | |
2434 | ||
e5d679f3 AD |
2435 | ip6_dst_ops.kmem_cachep = |
2436 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
2437 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL); | |
1da177e4 LT |
2438 | fib6_init(); |
2439 | #ifdef CONFIG_PROC_FS | |
2440 | p = proc_net_create("ipv6_route", 0, rt6_proc_info); | |
2441 | if (p) | |
2442 | p->owner = THIS_MODULE; | |
2443 | ||
2444 | proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2445 | #endif | |
2446 | #ifdef CONFIG_XFRM | |
2447 | xfrm6_init(); | |
2448 | #endif | |
101367c2 TG |
2449 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2450 | fib6_rules_init(); | |
2451 | #endif | |
1da177e4 LT |
2452 | } |
2453 | ||
2454 | void ip6_route_cleanup(void) | |
2455 | { | |
101367c2 TG |
2456 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2457 | fib6_rules_cleanup(); | |
2458 | #endif | |
1da177e4 LT |
2459 | #ifdef CONFIG_PROC_FS |
2460 | proc_net_remove("ipv6_route"); | |
2461 | proc_net_remove("rt6_stats"); | |
2462 | #endif | |
2463 | #ifdef CONFIG_XFRM | |
2464 | xfrm6_fini(); | |
2465 | #endif | |
2466 | rt6_ifdown(NULL); | |
2467 | fib6_gc_cleanup(); | |
2468 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2469 | } |