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