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1 | /* | |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
7 | * | |
8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | /* Changes: | |
17 | * | |
18 | * YOSHIFUJI Hideaki @USAGI | |
19 | * reworked default router selection. | |
20 | * - respect outgoing interface | |
21 | * - select from (probably) reachable routers (i.e. | |
22 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
23 | * - always select the same router if it is (probably) | |
24 | * reachable. otherwise, round-robin the list. | |
25 | * Ville Nuorvala | |
26 | * Fixed routing subtrees. | |
27 | */ | |
28 | ||
29 | #include <linux/capability.h> | |
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> | |
40 | #include <linux/if_arp.h> | |
41 | #include <linux/proc_fs.h> | |
42 | #include <linux/seq_file.h> | |
43 | #include <net/net_namespace.h> | |
44 | #include <net/snmp.h> | |
45 | #include <net/ipv6.h> | |
46 | #include <net/ip6_fib.h> | |
47 | #include <net/ip6_route.h> | |
48 | #include <net/ndisc.h> | |
49 | #include <net/addrconf.h> | |
50 | #include <net/tcp.h> | |
51 | #include <linux/rtnetlink.h> | |
52 | #include <net/dst.h> | |
53 | #include <net/xfrm.h> | |
54 | #include <net/netevent.h> | |
55 | #include <net/netlink.h> | |
56 | ||
57 | #include <asm/uaccess.h> | |
58 | ||
59 | #ifdef CONFIG_SYSCTL | |
60 | #include <linux/sysctl.h> | |
61 | #endif | |
62 | ||
63 | /* Set to 3 to get tracing. */ | |
64 | #define RT6_DEBUG 2 | |
65 | ||
66 | #if RT6_DEBUG >= 3 | |
67 | #define RDBG(x) printk x | |
68 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
69 | #else | |
70 | #define RDBG(x) | |
71 | #define RT6_TRACE(x...) do { ; } while (0) | |
72 | #endif | |
73 | ||
74 | #define CLONE_OFFLINK_ROUTE 0 | |
75 | ||
76 | static int ip6_rt_max_size = 4096; | |
77 | static int ip6_rt_gc_min_interval = HZ / 2; | |
78 | static int ip6_rt_gc_timeout = 60*HZ; | |
79 | int ip6_rt_gc_interval = 30*HZ; | |
80 | static int ip6_rt_gc_elasticity = 9; | |
81 | static int ip6_rt_mtu_expires = 10*60*HZ; | |
82 | static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
83 | ||
84 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); | |
85 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
86 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); | |
87 | static void ip6_dst_destroy(struct dst_entry *); | |
88 | static void ip6_dst_ifdown(struct dst_entry *, | |
89 | struct net_device *dev, int how); | |
90 | static int ip6_dst_gc(void); | |
91 | ||
92 | static int ip6_pkt_discard(struct sk_buff *skb); | |
93 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
94 | static void ip6_link_failure(struct sk_buff *skb); | |
95 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
96 | ||
97 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
98 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
99 | struct in6_addr *gwaddr, int ifindex, | |
100 | unsigned pref); | |
101 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
102 | struct in6_addr *gwaddr, int ifindex); | |
103 | #endif | |
104 | ||
105 | static struct dst_ops ip6_dst_ops = { | |
106 | .family = AF_INET6, | |
107 | .protocol = __constant_htons(ETH_P_IPV6), | |
108 | .gc = ip6_dst_gc, | |
109 | .gc_thresh = 1024, | |
110 | .check = ip6_dst_check, | |
111 | .destroy = ip6_dst_destroy, | |
112 | .ifdown = ip6_dst_ifdown, | |
113 | .negative_advice = ip6_negative_advice, | |
114 | .link_failure = ip6_link_failure, | |
115 | .update_pmtu = ip6_rt_update_pmtu, | |
116 | .entry_size = sizeof(struct rt6_info), | |
117 | }; | |
118 | ||
119 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) | |
120 | { | |
121 | } | |
122 | ||
123 | static struct dst_ops ip6_dst_blackhole_ops = { | |
124 | .family = AF_INET6, | |
125 | .protocol = __constant_htons(ETH_P_IPV6), | |
126 | .destroy = ip6_dst_destroy, | |
127 | .check = ip6_dst_check, | |
128 | .update_pmtu = ip6_rt_blackhole_update_pmtu, | |
129 | .entry_size = sizeof(struct rt6_info), | |
130 | }; | |
131 | ||
132 | struct rt6_info ip6_null_entry = { | |
133 | .u = { | |
134 | .dst = { | |
135 | .__refcnt = ATOMIC_INIT(1), | |
136 | .__use = 1, | |
137 | .obsolete = -1, | |
138 | .error = -ENETUNREACH, | |
139 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
140 | .input = ip6_pkt_discard, | |
141 | .output = ip6_pkt_discard_out, | |
142 | .ops = &ip6_dst_ops, | |
143 | .path = (struct dst_entry*)&ip6_null_entry, | |
144 | } | |
145 | }, | |
146 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
147 | .rt6i_metric = ~(u32) 0, | |
148 | .rt6i_ref = ATOMIC_INIT(1), | |
149 | }; | |
150 | ||
151 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
152 | ||
153 | static int ip6_pkt_prohibit(struct sk_buff *skb); | |
154 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
155 | static int ip6_pkt_blk_hole(struct sk_buff *skb); | |
156 | ||
157 | struct rt6_info ip6_prohibit_entry = { | |
158 | .u = { | |
159 | .dst = { | |
160 | .__refcnt = ATOMIC_INIT(1), | |
161 | .__use = 1, | |
162 | .obsolete = -1, | |
163 | .error = -EACCES, | |
164 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
165 | .input = ip6_pkt_prohibit, | |
166 | .output = ip6_pkt_prohibit_out, | |
167 | .ops = &ip6_dst_ops, | |
168 | .path = (struct dst_entry*)&ip6_prohibit_entry, | |
169 | } | |
170 | }, | |
171 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
172 | .rt6i_metric = ~(u32) 0, | |
173 | .rt6i_ref = ATOMIC_INIT(1), | |
174 | }; | |
175 | ||
176 | struct rt6_info ip6_blk_hole_entry = { | |
177 | .u = { | |
178 | .dst = { | |
179 | .__refcnt = ATOMIC_INIT(1), | |
180 | .__use = 1, | |
181 | .obsolete = -1, | |
182 | .error = -EINVAL, | |
183 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, | |
184 | .input = ip6_pkt_blk_hole, | |
185 | .output = ip6_pkt_blk_hole, | |
186 | .ops = &ip6_dst_ops, | |
187 | .path = (struct dst_entry*)&ip6_blk_hole_entry, | |
188 | } | |
189 | }, | |
190 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
191 | .rt6i_metric = ~(u32) 0, | |
192 | .rt6i_ref = ATOMIC_INIT(1), | |
193 | }; | |
194 | ||
195 | #endif | |
196 | ||
197 | /* allocate dst with ip6_dst_ops */ | |
198 | static __inline__ struct rt6_info *ip6_dst_alloc(void) | |
199 | { | |
200 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); | |
201 | } | |
202 | ||
203 | static void ip6_dst_destroy(struct dst_entry *dst) | |
204 | { | |
205 | struct rt6_info *rt = (struct rt6_info *)dst; | |
206 | struct inet6_dev *idev = rt->rt6i_idev; | |
207 | ||
208 | if (idev != NULL) { | |
209 | rt->rt6i_idev = NULL; | |
210 | in6_dev_put(idev); | |
211 | } | |
212 | } | |
213 | ||
214 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
215 | int how) | |
216 | { | |
217 | struct rt6_info *rt = (struct rt6_info *)dst; | |
218 | struct inet6_dev *idev = rt->rt6i_idev; | |
219 | ||
220 | if (dev != init_net.loopback_dev && idev != NULL && idev->dev == dev) { | |
221 | struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev); | |
222 | if (loopback_idev != NULL) { | |
223 | rt->rt6i_idev = loopback_idev; | |
224 | in6_dev_put(idev); | |
225 | } | |
226 | } | |
227 | } | |
228 | ||
229 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
230 | { | |
231 | return (rt->rt6i_flags & RTF_EXPIRES && | |
232 | time_after(jiffies, rt->rt6i_expires)); | |
233 | } | |
234 | ||
235 | static inline int rt6_need_strict(struct in6_addr *daddr) | |
236 | { | |
237 | return (ipv6_addr_type(daddr) & | |
238 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)); | |
239 | } | |
240 | ||
241 | /* | |
242 | * Route lookup. Any table->tb6_lock is implied. | |
243 | */ | |
244 | ||
245 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, | |
246 | int oif, | |
247 | int strict) | |
248 | { | |
249 | struct rt6_info *local = NULL; | |
250 | struct rt6_info *sprt; | |
251 | ||
252 | if (oif) { | |
253 | for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) { | |
254 | struct net_device *dev = sprt->rt6i_dev; | |
255 | if (dev->ifindex == oif) | |
256 | return sprt; | |
257 | if (dev->flags & IFF_LOOPBACK) { | |
258 | if (sprt->rt6i_idev == NULL || | |
259 | sprt->rt6i_idev->dev->ifindex != oif) { | |
260 | if (strict && oif) | |
261 | continue; | |
262 | if (local && (!oif || | |
263 | local->rt6i_idev->dev->ifindex == oif)) | |
264 | continue; | |
265 | } | |
266 | local = sprt; | |
267 | } | |
268 | } | |
269 | ||
270 | if (local) | |
271 | return local; | |
272 | ||
273 | if (strict) | |
274 | return &ip6_null_entry; | |
275 | } | |
276 | return rt; | |
277 | } | |
278 | ||
279 | #ifdef CONFIG_IPV6_ROUTER_PREF | |
280 | static void rt6_probe(struct rt6_info *rt) | |
281 | { | |
282 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
283 | /* | |
284 | * Okay, this does not seem to be appropriate | |
285 | * for now, however, we need to check if it | |
286 | * is really so; aka Router Reachability Probing. | |
287 | * | |
288 | * Router Reachability Probe MUST be rate-limited | |
289 | * to no more than one per minute. | |
290 | */ | |
291 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
292 | return; | |
293 | read_lock_bh(&neigh->lock); | |
294 | if (!(neigh->nud_state & NUD_VALID) && | |
295 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { | |
296 | struct in6_addr mcaddr; | |
297 | struct in6_addr *target; | |
298 | ||
299 | neigh->updated = jiffies; | |
300 | read_unlock_bh(&neigh->lock); | |
301 | ||
302 | target = (struct in6_addr *)&neigh->primary_key; | |
303 | addrconf_addr_solict_mult(target, &mcaddr); | |
304 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
305 | } else | |
306 | read_unlock_bh(&neigh->lock); | |
307 | } | |
308 | #else | |
309 | static inline void rt6_probe(struct rt6_info *rt) | |
310 | { | |
311 | return; | |
312 | } | |
313 | #endif | |
314 | ||
315 | /* | |
316 | * Default Router Selection (RFC 2461 6.3.6) | |
317 | */ | |
318 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) | |
319 | { | |
320 | struct net_device *dev = rt->rt6i_dev; | |
321 | if (!oif || dev->ifindex == oif) | |
322 | return 2; | |
323 | if ((dev->flags & IFF_LOOPBACK) && | |
324 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
325 | return 1; | |
326 | return 0; | |
327 | } | |
328 | ||
329 | static inline int rt6_check_neigh(struct rt6_info *rt) | |
330 | { | |
331 | struct neighbour *neigh = rt->rt6i_nexthop; | |
332 | int m = 0; | |
333 | if (rt->rt6i_flags & RTF_NONEXTHOP || | |
334 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
335 | m = 1; | |
336 | else if (neigh) { | |
337 | read_lock_bh(&neigh->lock); | |
338 | if (neigh->nud_state & NUD_VALID) | |
339 | m = 2; | |
340 | else if (!(neigh->nud_state & NUD_FAILED)) | |
341 | m = 1; | |
342 | read_unlock_bh(&neigh->lock); | |
343 | } | |
344 | return m; | |
345 | } | |
346 | ||
347 | static int rt6_score_route(struct rt6_info *rt, int oif, | |
348 | int strict) | |
349 | { | |
350 | int m, n; | |
351 | ||
352 | m = rt6_check_dev(rt, oif); | |
353 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) | |
354 | return -1; | |
355 | #ifdef CONFIG_IPV6_ROUTER_PREF | |
356 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
357 | #endif | |
358 | n = rt6_check_neigh(rt); | |
359 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) | |
360 | return -1; | |
361 | return m; | |
362 | } | |
363 | ||
364 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, | |
365 | int *mpri, struct rt6_info *match) | |
366 | { | |
367 | int m; | |
368 | ||
369 | if (rt6_check_expired(rt)) | |
370 | goto out; | |
371 | ||
372 | m = rt6_score_route(rt, oif, strict); | |
373 | if (m < 0) | |
374 | goto out; | |
375 | ||
376 | if (m > *mpri) { | |
377 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
378 | rt6_probe(match); | |
379 | *mpri = m; | |
380 | match = rt; | |
381 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
382 | rt6_probe(rt); | |
383 | } | |
384 | ||
385 | out: | |
386 | return match; | |
387 | } | |
388 | ||
389 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
390 | struct rt6_info *rr_head, | |
391 | u32 metric, int oif, int strict) | |
392 | { | |
393 | struct rt6_info *rt, *match; | |
394 | int mpri = -1; | |
395 | ||
396 | match = NULL; | |
397 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
398 | rt = rt->u.dst.rt6_next) | |
399 | match = find_match(rt, oif, strict, &mpri, match); | |
400 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
401 | rt = rt->u.dst.rt6_next) | |
402 | match = find_match(rt, oif, strict, &mpri, match); | |
403 | ||
404 | return match; | |
405 | } | |
406 | ||
407 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) | |
408 | { | |
409 | struct rt6_info *match, *rt0; | |
410 | ||
411 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", | |
412 | __FUNCTION__, fn->leaf, oif); | |
413 | ||
414 | rt0 = fn->rr_ptr; | |
415 | if (!rt0) | |
416 | fn->rr_ptr = rt0 = fn->leaf; | |
417 | ||
418 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); | |
419 | ||
420 | if (!match && | |
421 | (strict & RT6_LOOKUP_F_REACHABLE)) { | |
422 | struct rt6_info *next = rt0->u.dst.rt6_next; | |
423 | ||
424 | /* no entries matched; do round-robin */ | |
425 | if (!next || next->rt6i_metric != rt0->rt6i_metric) | |
426 | next = fn->leaf; | |
427 | ||
428 | if (next != rt0) | |
429 | fn->rr_ptr = next; | |
430 | } | |
431 | ||
432 | RT6_TRACE("%s() => %p\n", | |
433 | __FUNCTION__, match); | |
434 | ||
435 | return (match ? match : &ip6_null_entry); | |
436 | } | |
437 | ||
438 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
439 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
440 | struct in6_addr *gwaddr) | |
441 | { | |
442 | struct route_info *rinfo = (struct route_info *) opt; | |
443 | struct in6_addr prefix_buf, *prefix; | |
444 | unsigned int pref; | |
445 | u32 lifetime; | |
446 | struct rt6_info *rt; | |
447 | ||
448 | if (len < sizeof(struct route_info)) { | |
449 | return -EINVAL; | |
450 | } | |
451 | ||
452 | /* Sanity check for prefix_len and length */ | |
453 | if (rinfo->length > 3) { | |
454 | return -EINVAL; | |
455 | } else if (rinfo->prefix_len > 128) { | |
456 | return -EINVAL; | |
457 | } else if (rinfo->prefix_len > 64) { | |
458 | if (rinfo->length < 2) { | |
459 | return -EINVAL; | |
460 | } | |
461 | } else if (rinfo->prefix_len > 0) { | |
462 | if (rinfo->length < 1) { | |
463 | return -EINVAL; | |
464 | } | |
465 | } | |
466 | ||
467 | pref = rinfo->route_pref; | |
468 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
469 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
470 | ||
471 | lifetime = ntohl(rinfo->lifetime); | |
472 | if (lifetime == 0xffffffff) { | |
473 | /* infinity */ | |
474 | } else if (lifetime > 0x7fffffff/HZ) { | |
475 | /* Avoid arithmetic overflow */ | |
476 | lifetime = 0x7fffffff/HZ - 1; | |
477 | } | |
478 | ||
479 | if (rinfo->length == 3) | |
480 | prefix = (struct in6_addr *)rinfo->prefix; | |
481 | else { | |
482 | /* this function is safe */ | |
483 | ipv6_addr_prefix(&prefix_buf, | |
484 | (struct in6_addr *)rinfo->prefix, | |
485 | rinfo->prefix_len); | |
486 | prefix = &prefix_buf; | |
487 | } | |
488 | ||
489 | rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex); | |
490 | ||
491 | if (rt && !lifetime) { | |
492 | ip6_del_rt(rt); | |
493 | rt = NULL; | |
494 | } | |
495 | ||
496 | if (!rt && lifetime) | |
497 | rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex, | |
498 | pref); | |
499 | else if (rt) | |
500 | rt->rt6i_flags = RTF_ROUTEINFO | | |
501 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
502 | ||
503 | if (rt) { | |
504 | if (lifetime == 0xffffffff) { | |
505 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
506 | } else { | |
507 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
508 | rt->rt6i_flags |= RTF_EXPIRES; | |
509 | } | |
510 | dst_release(&rt->u.dst); | |
511 | } | |
512 | return 0; | |
513 | } | |
514 | #endif | |
515 | ||
516 | #define BACKTRACK(saddr) \ | |
517 | do { \ | |
518 | if (rt == &ip6_null_entry) { \ | |
519 | struct fib6_node *pn; \ | |
520 | while (1) { \ | |
521 | if (fn->fn_flags & RTN_TL_ROOT) \ | |
522 | goto out; \ | |
523 | pn = fn->parent; \ | |
524 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
525 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ | |
526 | else \ | |
527 | fn = pn; \ | |
528 | if (fn->fn_flags & RTN_RTINFO) \ | |
529 | goto restart; \ | |
530 | } \ | |
531 | } \ | |
532 | } while(0) | |
533 | ||
534 | static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table, | |
535 | struct flowi *fl, int flags) | |
536 | { | |
537 | struct fib6_node *fn; | |
538 | struct rt6_info *rt; | |
539 | ||
540 | read_lock_bh(&table->tb6_lock); | |
541 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
542 | restart: | |
543 | rt = fn->leaf; | |
544 | rt = rt6_device_match(rt, fl->oif, flags); | |
545 | BACKTRACK(&fl->fl6_src); | |
546 | out: | |
547 | dst_use(&rt->u.dst, jiffies); | |
548 | read_unlock_bh(&table->tb6_lock); | |
549 | return rt; | |
550 | ||
551 | } | |
552 | ||
553 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, | |
554 | int oif, int strict) | |
555 | { | |
556 | struct flowi fl = { | |
557 | .oif = oif, | |
558 | .nl_u = { | |
559 | .ip6_u = { | |
560 | .daddr = *daddr, | |
561 | }, | |
562 | }, | |
563 | }; | |
564 | struct dst_entry *dst; | |
565 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; | |
566 | ||
567 | if (saddr) { | |
568 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
569 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
570 | } | |
571 | ||
572 | dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup); | |
573 | if (dst->error == 0) | |
574 | return (struct rt6_info *) dst; | |
575 | ||
576 | dst_release(dst); | |
577 | ||
578 | return NULL; | |
579 | } | |
580 | ||
581 | EXPORT_SYMBOL(rt6_lookup); | |
582 | ||
583 | /* ip6_ins_rt is called with FREE table->tb6_lock. | |
584 | It takes new route entry, the addition fails by any reason the | |
585 | route is freed. In any case, if caller does not hold it, it may | |
586 | be destroyed. | |
587 | */ | |
588 | ||
589 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) | |
590 | { | |
591 | int err; | |
592 | struct fib6_table *table; | |
593 | ||
594 | table = rt->rt6i_table; | |
595 | write_lock_bh(&table->tb6_lock); | |
596 | err = fib6_add(&table->tb6_root, rt, info); | |
597 | write_unlock_bh(&table->tb6_lock); | |
598 | ||
599 | return err; | |
600 | } | |
601 | ||
602 | int ip6_ins_rt(struct rt6_info *rt) | |
603 | { | |
604 | return __ip6_ins_rt(rt, NULL); | |
605 | } | |
606 | ||
607 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, | |
608 | struct in6_addr *saddr) | |
609 | { | |
610 | struct rt6_info *rt; | |
611 | ||
612 | /* | |
613 | * Clone the route. | |
614 | */ | |
615 | ||
616 | rt = ip6_rt_copy(ort); | |
617 | ||
618 | if (rt) { | |
619 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { | |
620 | if (rt->rt6i_dst.plen != 128 && | |
621 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
622 | rt->rt6i_flags |= RTF_ANYCAST; | |
623 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); | |
624 | } | |
625 | ||
626 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
627 | rt->rt6i_dst.plen = 128; | |
628 | rt->rt6i_flags |= RTF_CACHE; | |
629 | rt->u.dst.flags |= DST_HOST; | |
630 | ||
631 | #ifdef CONFIG_IPV6_SUBTREES | |
632 | if (rt->rt6i_src.plen && saddr) { | |
633 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
634 | rt->rt6i_src.plen = 128; | |
635 | } | |
636 | #endif | |
637 | ||
638 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
639 | ||
640 | } | |
641 | ||
642 | return rt; | |
643 | } | |
644 | ||
645 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) | |
646 | { | |
647 | struct rt6_info *rt = ip6_rt_copy(ort); | |
648 | if (rt) { | |
649 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
650 | rt->rt6i_dst.plen = 128; | |
651 | rt->rt6i_flags |= RTF_CACHE; | |
652 | rt->u.dst.flags |= DST_HOST; | |
653 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); | |
654 | } | |
655 | return rt; | |
656 | } | |
657 | ||
658 | static struct rt6_info *ip6_pol_route(struct fib6_table *table, int oif, | |
659 | struct flowi *fl, int flags) | |
660 | { | |
661 | struct fib6_node *fn; | |
662 | struct rt6_info *rt, *nrt; | |
663 | int strict = 0; | |
664 | int attempts = 3; | |
665 | int err; | |
666 | int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; | |
667 | ||
668 | strict |= flags & RT6_LOOKUP_F_IFACE; | |
669 | ||
670 | relookup: | |
671 | read_lock_bh(&table->tb6_lock); | |
672 | ||
673 | restart_2: | |
674 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
675 | ||
676 | restart: | |
677 | rt = rt6_select(fn, oif, strict | reachable); | |
678 | BACKTRACK(&fl->fl6_src); | |
679 | if (rt == &ip6_null_entry || | |
680 | rt->rt6i_flags & RTF_CACHE) | |
681 | goto out; | |
682 | ||
683 | dst_hold(&rt->u.dst); | |
684 | read_unlock_bh(&table->tb6_lock); | |
685 | ||
686 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) | |
687 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); | |
688 | else { | |
689 | #if CLONE_OFFLINK_ROUTE | |
690 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); | |
691 | #else | |
692 | goto out2; | |
693 | #endif | |
694 | } | |
695 | ||
696 | dst_release(&rt->u.dst); | |
697 | rt = nrt ? : &ip6_null_entry; | |
698 | ||
699 | dst_hold(&rt->u.dst); | |
700 | if (nrt) { | |
701 | err = ip6_ins_rt(nrt); | |
702 | if (!err) | |
703 | goto out2; | |
704 | } | |
705 | ||
706 | if (--attempts <= 0) | |
707 | goto out2; | |
708 | ||
709 | /* | |
710 | * Race condition! In the gap, when table->tb6_lock was | |
711 | * released someone could insert this route. Relookup. | |
712 | */ | |
713 | dst_release(&rt->u.dst); | |
714 | goto relookup; | |
715 | ||
716 | out: | |
717 | if (reachable) { | |
718 | reachable = 0; | |
719 | goto restart_2; | |
720 | } | |
721 | dst_hold(&rt->u.dst); | |
722 | read_unlock_bh(&table->tb6_lock); | |
723 | out2: | |
724 | rt->u.dst.lastuse = jiffies; | |
725 | rt->u.dst.__use++; | |
726 | ||
727 | return rt; | |
728 | } | |
729 | ||
730 | static struct rt6_info *ip6_pol_route_input(struct fib6_table *table, | |
731 | struct flowi *fl, int flags) | |
732 | { | |
733 | return ip6_pol_route(table, fl->iif, fl, flags); | |
734 | } | |
735 | ||
736 | void ip6_route_input(struct sk_buff *skb) | |
737 | { | |
738 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
739 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
740 | struct flowi fl = { | |
741 | .iif = skb->dev->ifindex, | |
742 | .nl_u = { | |
743 | .ip6_u = { | |
744 | .daddr = iph->daddr, | |
745 | .saddr = iph->saddr, | |
746 | .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, | |
747 | }, | |
748 | }, | |
749 | .mark = skb->mark, | |
750 | .proto = iph->nexthdr, | |
751 | }; | |
752 | ||
753 | if (rt6_need_strict(&iph->daddr)) | |
754 | flags |= RT6_LOOKUP_F_IFACE; | |
755 | ||
756 | skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input); | |
757 | } | |
758 | ||
759 | static struct rt6_info *ip6_pol_route_output(struct fib6_table *table, | |
760 | struct flowi *fl, int flags) | |
761 | { | |
762 | return ip6_pol_route(table, fl->oif, fl, flags); | |
763 | } | |
764 | ||
765 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) | |
766 | { | |
767 | int flags = 0; | |
768 | ||
769 | if (rt6_need_strict(&fl->fl6_dst)) | |
770 | flags |= RT6_LOOKUP_F_IFACE; | |
771 | ||
772 | if (!ipv6_addr_any(&fl->fl6_src)) | |
773 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
774 | ||
775 | return fib6_rule_lookup(fl, flags, ip6_pol_route_output); | |
776 | } | |
777 | ||
778 | EXPORT_SYMBOL(ip6_route_output); | |
779 | ||
780 | static int ip6_blackhole_output(struct sk_buff *skb) | |
781 | { | |
782 | kfree_skb(skb); | |
783 | return 0; | |
784 | } | |
785 | ||
786 | int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl) | |
787 | { | |
788 | struct rt6_info *ort = (struct rt6_info *) *dstp; | |
789 | struct rt6_info *rt = (struct rt6_info *) | |
790 | dst_alloc(&ip6_dst_blackhole_ops); | |
791 | struct dst_entry *new = NULL; | |
792 | ||
793 | if (rt) { | |
794 | new = &rt->u.dst; | |
795 | ||
796 | atomic_set(&new->__refcnt, 1); | |
797 | new->__use = 1; | |
798 | new->input = ip6_blackhole_output; | |
799 | new->output = ip6_blackhole_output; | |
800 | ||
801 | memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
802 | new->dev = ort->u.dst.dev; | |
803 | if (new->dev) | |
804 | dev_hold(new->dev); | |
805 | rt->rt6i_idev = ort->rt6i_idev; | |
806 | if (rt->rt6i_idev) | |
807 | in6_dev_hold(rt->rt6i_idev); | |
808 | rt->rt6i_expires = 0; | |
809 | ||
810 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
811 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
812 | rt->rt6i_metric = 0; | |
813 | ||
814 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
815 | #ifdef CONFIG_IPV6_SUBTREES | |
816 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
817 | #endif | |
818 | ||
819 | dst_free(new); | |
820 | } | |
821 | ||
822 | dst_release(*dstp); | |
823 | *dstp = new; | |
824 | return (new ? 0 : -ENOMEM); | |
825 | } | |
826 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
827 | ||
828 | /* | |
829 | * Destination cache support functions | |
830 | */ | |
831 | ||
832 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
833 | { | |
834 | struct rt6_info *rt; | |
835 | ||
836 | rt = (struct rt6_info *) dst; | |
837 | ||
838 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) | |
839 | return dst; | |
840 | ||
841 | return NULL; | |
842 | } | |
843 | ||
844 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
845 | { | |
846 | struct rt6_info *rt = (struct rt6_info *) dst; | |
847 | ||
848 | if (rt) { | |
849 | if (rt->rt6i_flags & RTF_CACHE) | |
850 | ip6_del_rt(rt); | |
851 | else | |
852 | dst_release(dst); | |
853 | } | |
854 | return NULL; | |
855 | } | |
856 | ||
857 | static void ip6_link_failure(struct sk_buff *skb) | |
858 | { | |
859 | struct rt6_info *rt; | |
860 | ||
861 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); | |
862 | ||
863 | rt = (struct rt6_info *) skb->dst; | |
864 | if (rt) { | |
865 | if (rt->rt6i_flags&RTF_CACHE) { | |
866 | dst_set_expires(&rt->u.dst, 0); | |
867 | rt->rt6i_flags |= RTF_EXPIRES; | |
868 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
869 | rt->rt6i_node->fn_sernum = -1; | |
870 | } | |
871 | } | |
872 | ||
873 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
874 | { | |
875 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
876 | ||
877 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
878 | rt6->rt6i_flags |= RTF_MODIFIED; | |
879 | if (mtu < IPV6_MIN_MTU) { | |
880 | mtu = IPV6_MIN_MTU; | |
881 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
882 | } | |
883 | dst->metrics[RTAX_MTU-1] = mtu; | |
884 | call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst); | |
885 | } | |
886 | } | |
887 | ||
888 | static int ipv6_get_mtu(struct net_device *dev); | |
889 | ||
890 | static inline unsigned int ipv6_advmss(unsigned int mtu) | |
891 | { | |
892 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); | |
893 | ||
894 | if (mtu < ip6_rt_min_advmss) | |
895 | mtu = ip6_rt_min_advmss; | |
896 | ||
897 | /* | |
898 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and | |
899 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
900 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
901 | * rely only on pmtu discovery" | |
902 | */ | |
903 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
904 | mtu = IPV6_MAXPLEN; | |
905 | return mtu; | |
906 | } | |
907 | ||
908 | static struct dst_entry *ndisc_dst_gc_list; | |
909 | static DEFINE_SPINLOCK(ndisc_lock); | |
910 | ||
911 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, | |
912 | struct neighbour *neigh, | |
913 | struct in6_addr *addr, | |
914 | int (*output)(struct sk_buff *)) | |
915 | { | |
916 | struct rt6_info *rt; | |
917 | struct inet6_dev *idev = in6_dev_get(dev); | |
918 | ||
919 | if (unlikely(idev == NULL)) | |
920 | return NULL; | |
921 | ||
922 | rt = ip6_dst_alloc(); | |
923 | if (unlikely(rt == NULL)) { | |
924 | in6_dev_put(idev); | |
925 | goto out; | |
926 | } | |
927 | ||
928 | dev_hold(dev); | |
929 | if (neigh) | |
930 | neigh_hold(neigh); | |
931 | else | |
932 | neigh = ndisc_get_neigh(dev, addr); | |
933 | ||
934 | rt->rt6i_dev = dev; | |
935 | rt->rt6i_idev = idev; | |
936 | rt->rt6i_nexthop = neigh; | |
937 | atomic_set(&rt->u.dst.__refcnt, 1); | |
938 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; | |
939 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
940 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
941 | rt->u.dst.output = output; | |
942 | ||
943 | #if 0 /* there's no chance to use these for ndisc */ | |
944 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST | |
945 | ? DST_HOST | |
946 | : 0; | |
947 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
948 | rt->rt6i_dst.plen = 128; | |
949 | #endif | |
950 | ||
951 | spin_lock_bh(&ndisc_lock); | |
952 | rt->u.dst.next = ndisc_dst_gc_list; | |
953 | ndisc_dst_gc_list = &rt->u.dst; | |
954 | spin_unlock_bh(&ndisc_lock); | |
955 | ||
956 | fib6_force_start_gc(); | |
957 | ||
958 | out: | |
959 | return &rt->u.dst; | |
960 | } | |
961 | ||
962 | int ndisc_dst_gc(int *more) | |
963 | { | |
964 | struct dst_entry *dst, *next, **pprev; | |
965 | int freed; | |
966 | ||
967 | next = NULL; | |
968 | freed = 0; | |
969 | ||
970 | spin_lock_bh(&ndisc_lock); | |
971 | pprev = &ndisc_dst_gc_list; | |
972 | ||
973 | while ((dst = *pprev) != NULL) { | |
974 | if (!atomic_read(&dst->__refcnt)) { | |
975 | *pprev = dst->next; | |
976 | dst_free(dst); | |
977 | freed++; | |
978 | } else { | |
979 | pprev = &dst->next; | |
980 | (*more)++; | |
981 | } | |
982 | } | |
983 | ||
984 | spin_unlock_bh(&ndisc_lock); | |
985 | ||
986 | return freed; | |
987 | } | |
988 | ||
989 | static int ip6_dst_gc(void) | |
990 | { | |
991 | static unsigned expire = 30*HZ; | |
992 | static unsigned long last_gc; | |
993 | unsigned long now = jiffies; | |
994 | ||
995 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && | |
996 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) | |
997 | goto out; | |
998 | ||
999 | expire++; | |
1000 | fib6_run_gc(expire); | |
1001 | last_gc = now; | |
1002 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) | |
1003 | expire = ip6_rt_gc_timeout>>1; | |
1004 | ||
1005 | out: | |
1006 | expire -= expire>>ip6_rt_gc_elasticity; | |
1007 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); | |
1008 | } | |
1009 | ||
1010 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1011 | but results in cleaner routing tables. | |
1012 | ||
1013 | Remove it only when all the things will work! | |
1014 | */ | |
1015 | ||
1016 | static int ipv6_get_mtu(struct net_device *dev) | |
1017 | { | |
1018 | int mtu = IPV6_MIN_MTU; | |
1019 | struct inet6_dev *idev; | |
1020 | ||
1021 | idev = in6_dev_get(dev); | |
1022 | if (idev) { | |
1023 | mtu = idev->cnf.mtu6; | |
1024 | in6_dev_put(idev); | |
1025 | } | |
1026 | return mtu; | |
1027 | } | |
1028 | ||
1029 | int ipv6_get_hoplimit(struct net_device *dev) | |
1030 | { | |
1031 | int hoplimit = ipv6_devconf.hop_limit; | |
1032 | struct inet6_dev *idev; | |
1033 | ||
1034 | idev = in6_dev_get(dev); | |
1035 | if (idev) { | |
1036 | hoplimit = idev->cnf.hop_limit; | |
1037 | in6_dev_put(idev); | |
1038 | } | |
1039 | return hoplimit; | |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * | |
1044 | */ | |
1045 | ||
1046 | int ip6_route_add(struct fib6_config *cfg) | |
1047 | { | |
1048 | int err; | |
1049 | struct rt6_info *rt = NULL; | |
1050 | struct net_device *dev = NULL; | |
1051 | struct inet6_dev *idev = NULL; | |
1052 | struct fib6_table *table; | |
1053 | int addr_type; | |
1054 | ||
1055 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) | |
1056 | return -EINVAL; | |
1057 | #ifndef CONFIG_IPV6_SUBTREES | |
1058 | if (cfg->fc_src_len) | |
1059 | return -EINVAL; | |
1060 | #endif | |
1061 | if (cfg->fc_ifindex) { | |
1062 | err = -ENODEV; | |
1063 | dev = dev_get_by_index(&init_net, cfg->fc_ifindex); | |
1064 | if (!dev) | |
1065 | goto out; | |
1066 | idev = in6_dev_get(dev); | |
1067 | if (!idev) | |
1068 | goto out; | |
1069 | } | |
1070 | ||
1071 | if (cfg->fc_metric == 0) | |
1072 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1073 | ||
1074 | table = fib6_new_table(cfg->fc_table); | |
1075 | if (table == NULL) { | |
1076 | err = -ENOBUFS; | |
1077 | goto out; | |
1078 | } | |
1079 | ||
1080 | rt = ip6_dst_alloc(); | |
1081 | ||
1082 | if (rt == NULL) { | |
1083 | err = -ENOMEM; | |
1084 | goto out; | |
1085 | } | |
1086 | ||
1087 | rt->u.dst.obsolete = -1; | |
1088 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires); | |
1089 | ||
1090 | if (cfg->fc_protocol == RTPROT_UNSPEC) | |
1091 | cfg->fc_protocol = RTPROT_BOOT; | |
1092 | rt->rt6i_protocol = cfg->fc_protocol; | |
1093 | ||
1094 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1095 | ||
1096 | if (addr_type & IPV6_ADDR_MULTICAST) | |
1097 | rt->u.dst.input = ip6_mc_input; | |
1098 | else | |
1099 | rt->u.dst.input = ip6_forward; | |
1100 | ||
1101 | rt->u.dst.output = ip6_output; | |
1102 | ||
1103 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); | |
1104 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1105 | if (rt->rt6i_dst.plen == 128) | |
1106 | rt->u.dst.flags = DST_HOST; | |
1107 | ||
1108 | #ifdef CONFIG_IPV6_SUBTREES | |
1109 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); | |
1110 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1111 | #endif | |
1112 | ||
1113 | rt->rt6i_metric = cfg->fc_metric; | |
1114 | ||
1115 | /* We cannot add true routes via loopback here, | |
1116 | they would result in kernel looping; promote them to reject routes | |
1117 | */ | |
1118 | if ((cfg->fc_flags & RTF_REJECT) || | |
1119 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { | |
1120 | /* hold loopback dev/idev if we haven't done so. */ | |
1121 | if (dev != init_net.loopback_dev) { | |
1122 | if (dev) { | |
1123 | dev_put(dev); | |
1124 | in6_dev_put(idev); | |
1125 | } | |
1126 | dev = init_net.loopback_dev; | |
1127 | dev_hold(dev); | |
1128 | idev = in6_dev_get(dev); | |
1129 | if (!idev) { | |
1130 | err = -ENODEV; | |
1131 | goto out; | |
1132 | } | |
1133 | } | |
1134 | rt->u.dst.output = ip6_pkt_discard_out; | |
1135 | rt->u.dst.input = ip6_pkt_discard; | |
1136 | rt->u.dst.error = -ENETUNREACH; | |
1137 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; | |
1138 | goto install_route; | |
1139 | } | |
1140 | ||
1141 | if (cfg->fc_flags & RTF_GATEWAY) { | |
1142 | struct in6_addr *gw_addr; | |
1143 | int gwa_type; | |
1144 | ||
1145 | gw_addr = &cfg->fc_gateway; | |
1146 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1147 | gwa_type = ipv6_addr_type(gw_addr); | |
1148 | ||
1149 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1150 | struct rt6_info *grt; | |
1151 | ||
1152 | /* IPv6 strictly inhibits using not link-local | |
1153 | addresses as nexthop address. | |
1154 | Otherwise, router will not able to send redirects. | |
1155 | It is very good, but in some (rare!) circumstances | |
1156 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1157 | some exceptions. --ANK | |
1158 | */ | |
1159 | err = -EINVAL; | |
1160 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1161 | goto out; | |
1162 | ||
1163 | grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1); | |
1164 | ||
1165 | err = -EHOSTUNREACH; | |
1166 | if (grt == NULL) | |
1167 | goto out; | |
1168 | if (dev) { | |
1169 | if (dev != grt->rt6i_dev) { | |
1170 | dst_release(&grt->u.dst); | |
1171 | goto out; | |
1172 | } | |
1173 | } else { | |
1174 | dev = grt->rt6i_dev; | |
1175 | idev = grt->rt6i_idev; | |
1176 | dev_hold(dev); | |
1177 | in6_dev_hold(grt->rt6i_idev); | |
1178 | } | |
1179 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1180 | err = 0; | |
1181 | dst_release(&grt->u.dst); | |
1182 | ||
1183 | if (err) | |
1184 | goto out; | |
1185 | } | |
1186 | err = -EINVAL; | |
1187 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1188 | goto out; | |
1189 | } | |
1190 | ||
1191 | err = -ENODEV; | |
1192 | if (dev == NULL) | |
1193 | goto out; | |
1194 | ||
1195 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { | |
1196 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); | |
1197 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1198 | err = PTR_ERR(rt->rt6i_nexthop); | |
1199 | rt->rt6i_nexthop = NULL; | |
1200 | goto out; | |
1201 | } | |
1202 | } | |
1203 | ||
1204 | rt->rt6i_flags = cfg->fc_flags; | |
1205 | ||
1206 | install_route: | |
1207 | if (cfg->fc_mx) { | |
1208 | struct nlattr *nla; | |
1209 | int remaining; | |
1210 | ||
1211 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1212 | int type = nla_type(nla); | |
1213 | ||
1214 | if (type) { | |
1215 | if (type > RTAX_MAX) { | |
1216 | err = -EINVAL; | |
1217 | goto out; | |
1218 | } | |
1219 | ||
1220 | rt->u.dst.metrics[type - 1] = nla_get_u32(nla); | |
1221 | } | |
1222 | } | |
1223 | } | |
1224 | ||
1225 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) | |
1226 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1227 | if (!rt->u.dst.metrics[RTAX_MTU-1]) | |
1228 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); | |
1229 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) | |
1230 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1231 | rt->u.dst.dev = dev; | |
1232 | rt->rt6i_idev = idev; | |
1233 | rt->rt6i_table = table; | |
1234 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); | |
1235 | ||
1236 | out: | |
1237 | if (dev) | |
1238 | dev_put(dev); | |
1239 | if (idev) | |
1240 | in6_dev_put(idev); | |
1241 | if (rt) | |
1242 | dst_free(&rt->u.dst); | |
1243 | return err; | |
1244 | } | |
1245 | ||
1246 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) | |
1247 | { | |
1248 | int err; | |
1249 | struct fib6_table *table; | |
1250 | ||
1251 | if (rt == &ip6_null_entry) | |
1252 | return -ENOENT; | |
1253 | ||
1254 | table = rt->rt6i_table; | |
1255 | write_lock_bh(&table->tb6_lock); | |
1256 | ||
1257 | err = fib6_del(rt, info); | |
1258 | dst_release(&rt->u.dst); | |
1259 | ||
1260 | write_unlock_bh(&table->tb6_lock); | |
1261 | ||
1262 | return err; | |
1263 | } | |
1264 | ||
1265 | int ip6_del_rt(struct rt6_info *rt) | |
1266 | { | |
1267 | return __ip6_del_rt(rt, NULL); | |
1268 | } | |
1269 | ||
1270 | static int ip6_route_del(struct fib6_config *cfg) | |
1271 | { | |
1272 | struct fib6_table *table; | |
1273 | struct fib6_node *fn; | |
1274 | struct rt6_info *rt; | |
1275 | int err = -ESRCH; | |
1276 | ||
1277 | table = fib6_get_table(cfg->fc_table); | |
1278 | if (table == NULL) | |
1279 | return err; | |
1280 | ||
1281 | read_lock_bh(&table->tb6_lock); | |
1282 | ||
1283 | fn = fib6_locate(&table->tb6_root, | |
1284 | &cfg->fc_dst, cfg->fc_dst_len, | |
1285 | &cfg->fc_src, cfg->fc_src_len); | |
1286 | ||
1287 | if (fn) { | |
1288 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { | |
1289 | if (cfg->fc_ifindex && | |
1290 | (rt->rt6i_dev == NULL || | |
1291 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) | |
1292 | continue; | |
1293 | if (cfg->fc_flags & RTF_GATEWAY && | |
1294 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1295 | continue; | |
1296 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) | |
1297 | continue; | |
1298 | dst_hold(&rt->u.dst); | |
1299 | read_unlock_bh(&table->tb6_lock); | |
1300 | ||
1301 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
1302 | } | |
1303 | } | |
1304 | read_unlock_bh(&table->tb6_lock); | |
1305 | ||
1306 | return err; | |
1307 | } | |
1308 | ||
1309 | /* | |
1310 | * Handle redirects | |
1311 | */ | |
1312 | struct ip6rd_flowi { | |
1313 | struct flowi fl; | |
1314 | struct in6_addr gateway; | |
1315 | }; | |
1316 | ||
1317 | static struct rt6_info *__ip6_route_redirect(struct fib6_table *table, | |
1318 | struct flowi *fl, | |
1319 | int flags) | |
1320 | { | |
1321 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; | |
1322 | struct rt6_info *rt; | |
1323 | struct fib6_node *fn; | |
1324 | ||
1325 | /* | |
1326 | * Get the "current" route for this destination and | |
1327 | * check if the redirect has come from approriate router. | |
1328 | * | |
1329 | * RFC 2461 specifies that redirects should only be | |
1330 | * accepted if they come from the nexthop to the target. | |
1331 | * Due to the way the routes are chosen, this notion | |
1332 | * is a bit fuzzy and one might need to check all possible | |
1333 | * routes. | |
1334 | */ | |
1335 | ||
1336 | read_lock_bh(&table->tb6_lock); | |
1337 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
1338 | restart: | |
1339 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { | |
1340 | /* | |
1341 | * Current route is on-link; redirect is always invalid. | |
1342 | * | |
1343 | * Seems, previous statement is not true. It could | |
1344 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1345 | * But then router serving it might decide, that we should | |
1346 | * know truth 8)8) --ANK (980726). | |
1347 | */ | |
1348 | if (rt6_check_expired(rt)) | |
1349 | continue; | |
1350 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1351 | continue; | |
1352 | if (fl->oif != rt->rt6i_dev->ifindex) | |
1353 | continue; | |
1354 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) | |
1355 | continue; | |
1356 | break; | |
1357 | } | |
1358 | ||
1359 | if (!rt) | |
1360 | rt = &ip6_null_entry; | |
1361 | BACKTRACK(&fl->fl6_src); | |
1362 | out: | |
1363 | dst_hold(&rt->u.dst); | |
1364 | ||
1365 | read_unlock_bh(&table->tb6_lock); | |
1366 | ||
1367 | return rt; | |
1368 | }; | |
1369 | ||
1370 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1371 | struct in6_addr *src, | |
1372 | struct in6_addr *gateway, | |
1373 | struct net_device *dev) | |
1374 | { | |
1375 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
1376 | struct ip6rd_flowi rdfl = { | |
1377 | .fl = { | |
1378 | .oif = dev->ifindex, | |
1379 | .nl_u = { | |
1380 | .ip6_u = { | |
1381 | .daddr = *dest, | |
1382 | .saddr = *src, | |
1383 | }, | |
1384 | }, | |
1385 | }, | |
1386 | .gateway = *gateway, | |
1387 | }; | |
1388 | ||
1389 | if (rt6_need_strict(dest)) | |
1390 | flags |= RT6_LOOKUP_F_IFACE; | |
1391 | ||
1392 | return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect); | |
1393 | } | |
1394 | ||
1395 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1396 | struct in6_addr *saddr, | |
1397 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1398 | { | |
1399 | struct rt6_info *rt, *nrt = NULL; | |
1400 | struct netevent_redirect netevent; | |
1401 | ||
1402 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1403 | ||
1404 | if (rt == &ip6_null_entry) { | |
1405 | if (net_ratelimit()) | |
1406 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1407 | "for redirect target\n"); | |
1408 | goto out; | |
1409 | } | |
1410 | ||
1411 | /* | |
1412 | * We have finally decided to accept it. | |
1413 | */ | |
1414 | ||
1415 | neigh_update(neigh, lladdr, NUD_STALE, | |
1416 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1417 | NEIGH_UPDATE_F_OVERRIDE| | |
1418 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1419 | NEIGH_UPDATE_F_ISROUTER)) | |
1420 | ); | |
1421 | ||
1422 | /* | |
1423 | * Redirect received -> path was valid. | |
1424 | * Look, redirects are sent only in response to data packets, | |
1425 | * so that this nexthop apparently is reachable. --ANK | |
1426 | */ | |
1427 | dst_confirm(&rt->u.dst); | |
1428 | ||
1429 | /* Duplicate redirect: silently ignore. */ | |
1430 | if (neigh == rt->u.dst.neighbour) | |
1431 | goto out; | |
1432 | ||
1433 | nrt = ip6_rt_copy(rt); | |
1434 | if (nrt == NULL) | |
1435 | goto out; | |
1436 | ||
1437 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1438 | if (on_link) | |
1439 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1440 | ||
1441 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1442 | nrt->rt6i_dst.plen = 128; | |
1443 | nrt->u.dst.flags |= DST_HOST; | |
1444 | ||
1445 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1446 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1447 | /* Reset pmtu, it may be better */ | |
1448 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); | |
1449 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); | |
1450 | ||
1451 | if (ip6_ins_rt(nrt)) | |
1452 | goto out; | |
1453 | ||
1454 | netevent.old = &rt->u.dst; | |
1455 | netevent.new = &nrt->u.dst; | |
1456 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); | |
1457 | ||
1458 | if (rt->rt6i_flags&RTF_CACHE) { | |
1459 | ip6_del_rt(rt); | |
1460 | return; | |
1461 | } | |
1462 | ||
1463 | out: | |
1464 | dst_release(&rt->u.dst); | |
1465 | return; | |
1466 | } | |
1467 | ||
1468 | /* | |
1469 | * Handle ICMP "packet too big" messages | |
1470 | * i.e. Path MTU discovery | |
1471 | */ | |
1472 | ||
1473 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, | |
1474 | struct net_device *dev, u32 pmtu) | |
1475 | { | |
1476 | struct rt6_info *rt, *nrt; | |
1477 | int allfrag = 0; | |
1478 | ||
1479 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); | |
1480 | if (rt == NULL) | |
1481 | return; | |
1482 | ||
1483 | if (pmtu >= dst_mtu(&rt->u.dst)) | |
1484 | goto out; | |
1485 | ||
1486 | if (pmtu < IPV6_MIN_MTU) { | |
1487 | /* | |
1488 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link | |
1489 | * MTU (1280) and a fragment header should always be included | |
1490 | * after a node receiving Too Big message reporting PMTU is | |
1491 | * less than the IPv6 Minimum Link MTU. | |
1492 | */ | |
1493 | pmtu = IPV6_MIN_MTU; | |
1494 | allfrag = 1; | |
1495 | } | |
1496 | ||
1497 | /* New mtu received -> path was valid. | |
1498 | They are sent only in response to data packets, | |
1499 | so that this nexthop apparently is reachable. --ANK | |
1500 | */ | |
1501 | dst_confirm(&rt->u.dst); | |
1502 | ||
1503 | /* Host route. If it is static, it would be better | |
1504 | not to override it, but add new one, so that | |
1505 | when cache entry will expire old pmtu | |
1506 | would return automatically. | |
1507 | */ | |
1508 | if (rt->rt6i_flags & RTF_CACHE) { | |
1509 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1510 | if (allfrag) | |
1511 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1512 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); | |
1513 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; | |
1514 | goto out; | |
1515 | } | |
1516 | ||
1517 | /* Network route. | |
1518 | Two cases are possible: | |
1519 | 1. It is connected route. Action: COW | |
1520 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1521 | */ | |
1522 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) | |
1523 | nrt = rt6_alloc_cow(rt, daddr, saddr); | |
1524 | else | |
1525 | nrt = rt6_alloc_clone(rt, daddr); | |
1526 | ||
1527 | if (nrt) { | |
1528 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; | |
1529 | if (allfrag) | |
1530 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; | |
1531 | ||
1532 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1533 | * happened within 5 mins, the recommended timer is 10 mins. | |
1534 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1535 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1536 | * and detecting PMTU increase will be automatically happened. | |
1537 | */ | |
1538 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); | |
1539 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; | |
1540 | ||
1541 | ip6_ins_rt(nrt); | |
1542 | } | |
1543 | out: | |
1544 | dst_release(&rt->u.dst); | |
1545 | } | |
1546 | ||
1547 | /* | |
1548 | * Misc support functions | |
1549 | */ | |
1550 | ||
1551 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1552 | { | |
1553 | struct rt6_info *rt = ip6_dst_alloc(); | |
1554 | ||
1555 | if (rt) { | |
1556 | rt->u.dst.input = ort->u.dst.input; | |
1557 | rt->u.dst.output = ort->u.dst.output; | |
1558 | ||
1559 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); | |
1560 | rt->u.dst.error = ort->u.dst.error; | |
1561 | rt->u.dst.dev = ort->u.dst.dev; | |
1562 | if (rt->u.dst.dev) | |
1563 | dev_hold(rt->u.dst.dev); | |
1564 | rt->rt6i_idev = ort->rt6i_idev; | |
1565 | if (rt->rt6i_idev) | |
1566 | in6_dev_hold(rt->rt6i_idev); | |
1567 | rt->u.dst.lastuse = jiffies; | |
1568 | rt->rt6i_expires = 0; | |
1569 | ||
1570 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1571 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1572 | rt->rt6i_metric = 0; | |
1573 | ||
1574 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1575 | #ifdef CONFIG_IPV6_SUBTREES | |
1576 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1577 | #endif | |
1578 | rt->rt6i_table = ort->rt6i_table; | |
1579 | } | |
1580 | return rt; | |
1581 | } | |
1582 | ||
1583 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
1584 | static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen, | |
1585 | struct in6_addr *gwaddr, int ifindex) | |
1586 | { | |
1587 | struct fib6_node *fn; | |
1588 | struct rt6_info *rt = NULL; | |
1589 | struct fib6_table *table; | |
1590 | ||
1591 | table = fib6_get_table(RT6_TABLE_INFO); | |
1592 | if (table == NULL) | |
1593 | return NULL; | |
1594 | ||
1595 | write_lock_bh(&table->tb6_lock); | |
1596 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
1597 | if (!fn) | |
1598 | goto out; | |
1599 | ||
1600 | for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) { | |
1601 | if (rt->rt6i_dev->ifindex != ifindex) | |
1602 | continue; | |
1603 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1604 | continue; | |
1605 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1606 | continue; | |
1607 | dst_hold(&rt->u.dst); | |
1608 | break; | |
1609 | } | |
1610 | out: | |
1611 | write_unlock_bh(&table->tb6_lock); | |
1612 | return rt; | |
1613 | } | |
1614 | ||
1615 | static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen, | |
1616 | struct in6_addr *gwaddr, int ifindex, | |
1617 | unsigned pref) | |
1618 | { | |
1619 | struct fib6_config cfg = { | |
1620 | .fc_table = RT6_TABLE_INFO, | |
1621 | .fc_metric = 1024, | |
1622 | .fc_ifindex = ifindex, | |
1623 | .fc_dst_len = prefixlen, | |
1624 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1625 | RTF_UP | RTF_PREF(pref), | |
1626 | }; | |
1627 | ||
1628 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1629 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
1630 | ||
1631 | /* We should treat it as a default route if prefix length is 0. */ | |
1632 | if (!prefixlen) | |
1633 | cfg.fc_flags |= RTF_DEFAULT; | |
1634 | ||
1635 | ip6_route_add(&cfg); | |
1636 | ||
1637 | return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex); | |
1638 | } | |
1639 | #endif | |
1640 | ||
1641 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) | |
1642 | { | |
1643 | struct rt6_info *rt; | |
1644 | struct fib6_table *table; | |
1645 | ||
1646 | table = fib6_get_table(RT6_TABLE_DFLT); | |
1647 | if (table == NULL) | |
1648 | return NULL; | |
1649 | ||
1650 | write_lock_bh(&table->tb6_lock); | |
1651 | for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) { | |
1652 | if (dev == rt->rt6i_dev && | |
1653 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && | |
1654 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) | |
1655 | break; | |
1656 | } | |
1657 | if (rt) | |
1658 | dst_hold(&rt->u.dst); | |
1659 | write_unlock_bh(&table->tb6_lock); | |
1660 | return rt; | |
1661 | } | |
1662 | ||
1663 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
1664 | struct net_device *dev, | |
1665 | unsigned int pref) | |
1666 | { | |
1667 | struct fib6_config cfg = { | |
1668 | .fc_table = RT6_TABLE_DFLT, | |
1669 | .fc_metric = 1024, | |
1670 | .fc_ifindex = dev->ifindex, | |
1671 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1672 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
1673 | }; | |
1674 | ||
1675 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
1676 | ||
1677 | ip6_route_add(&cfg); | |
1678 | ||
1679 | return rt6_get_dflt_router(gwaddr, dev); | |
1680 | } | |
1681 | ||
1682 | void rt6_purge_dflt_routers(void) | |
1683 | { | |
1684 | struct rt6_info *rt; | |
1685 | struct fib6_table *table; | |
1686 | ||
1687 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
1688 | table = fib6_get_table(RT6_TABLE_DFLT); | |
1689 | if (table == NULL) | |
1690 | return; | |
1691 | ||
1692 | restart: | |
1693 | read_lock_bh(&table->tb6_lock); | |
1694 | for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) { | |
1695 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { | |
1696 | dst_hold(&rt->u.dst); | |
1697 | read_unlock_bh(&table->tb6_lock); | |
1698 | ip6_del_rt(rt); | |
1699 | goto restart; | |
1700 | } | |
1701 | } | |
1702 | read_unlock_bh(&table->tb6_lock); | |
1703 | } | |
1704 | ||
1705 | static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg, | |
1706 | struct fib6_config *cfg) | |
1707 | { | |
1708 | memset(cfg, 0, sizeof(*cfg)); | |
1709 | ||
1710 | cfg->fc_table = RT6_TABLE_MAIN; | |
1711 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1712 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1713 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1714 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1715 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1716 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1717 | ||
1718 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); | |
1719 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1720 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1721 | } | |
1722 | ||
1723 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) | |
1724 | { | |
1725 | struct fib6_config cfg; | |
1726 | struct in6_rtmsg rtmsg; | |
1727 | int err; | |
1728 | ||
1729 | switch(cmd) { | |
1730 | case SIOCADDRT: /* Add a route */ | |
1731 | case SIOCDELRT: /* Delete a route */ | |
1732 | if (!capable(CAP_NET_ADMIN)) | |
1733 | return -EPERM; | |
1734 | err = copy_from_user(&rtmsg, arg, | |
1735 | sizeof(struct in6_rtmsg)); | |
1736 | if (err) | |
1737 | return -EFAULT; | |
1738 | ||
1739 | rtmsg_to_fib6_config(&rtmsg, &cfg); | |
1740 | ||
1741 | rtnl_lock(); | |
1742 | switch (cmd) { | |
1743 | case SIOCADDRT: | |
1744 | err = ip6_route_add(&cfg); | |
1745 | break; | |
1746 | case SIOCDELRT: | |
1747 | err = ip6_route_del(&cfg); | |
1748 | break; | |
1749 | default: | |
1750 | err = -EINVAL; | |
1751 | } | |
1752 | rtnl_unlock(); | |
1753 | ||
1754 | return err; | |
1755 | } | |
1756 | ||
1757 | return -EINVAL; | |
1758 | } | |
1759 | ||
1760 | /* | |
1761 | * Drop the packet on the floor | |
1762 | */ | |
1763 | ||
1764 | static inline int ip6_pkt_drop(struct sk_buff *skb, int code, | |
1765 | int ipstats_mib_noroutes) | |
1766 | { | |
1767 | int type; | |
1768 | switch (ipstats_mib_noroutes) { | |
1769 | case IPSTATS_MIB_INNOROUTES: | |
1770 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); | |
1771 | if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) { | |
1772 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS); | |
1773 | break; | |
1774 | } | |
1775 | /* FALLTHROUGH */ | |
1776 | case IPSTATS_MIB_OUTNOROUTES: | |
1777 | IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes); | |
1778 | break; | |
1779 | } | |
1780 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev); | |
1781 | kfree_skb(skb); | |
1782 | return 0; | |
1783 | } | |
1784 | ||
1785 | static int ip6_pkt_discard(struct sk_buff *skb) | |
1786 | { | |
1787 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); | |
1788 | } | |
1789 | ||
1790 | static int ip6_pkt_discard_out(struct sk_buff *skb) | |
1791 | { | |
1792 | skb->dev = skb->dst->dev; | |
1793 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); | |
1794 | } | |
1795 | ||
1796 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
1797 | ||
1798 | static int ip6_pkt_prohibit(struct sk_buff *skb) | |
1799 | { | |
1800 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); | |
1801 | } | |
1802 | ||
1803 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1804 | { | |
1805 | skb->dev = skb->dst->dev; | |
1806 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); | |
1807 | } | |
1808 | ||
1809 | static int ip6_pkt_blk_hole(struct sk_buff *skb) | |
1810 | { | |
1811 | kfree_skb(skb); | |
1812 | return 0; | |
1813 | } | |
1814 | ||
1815 | #endif | |
1816 | ||
1817 | /* | |
1818 | * Allocate a dst for local (unicast / anycast) address. | |
1819 | */ | |
1820 | ||
1821 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1822 | const struct in6_addr *addr, | |
1823 | int anycast) | |
1824 | { | |
1825 | struct rt6_info *rt = ip6_dst_alloc(); | |
1826 | ||
1827 | if (rt == NULL) | |
1828 | return ERR_PTR(-ENOMEM); | |
1829 | ||
1830 | dev_hold(init_net.loopback_dev); | |
1831 | in6_dev_hold(idev); | |
1832 | ||
1833 | rt->u.dst.flags = DST_HOST; | |
1834 | rt->u.dst.input = ip6_input; | |
1835 | rt->u.dst.output = ip6_output; | |
1836 | rt->rt6i_dev = init_net.loopback_dev; | |
1837 | rt->rt6i_idev = idev; | |
1838 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); | |
1839 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); | |
1840 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; | |
1841 | rt->u.dst.obsolete = -1; | |
1842 | ||
1843 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
1844 | if (anycast) | |
1845 | rt->rt6i_flags |= RTF_ANYCAST; | |
1846 | else | |
1847 | rt->rt6i_flags |= RTF_LOCAL; | |
1848 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
1849 | if (rt->rt6i_nexthop == NULL) { | |
1850 | dst_free(&rt->u.dst); | |
1851 | return ERR_PTR(-ENOMEM); | |
1852 | } | |
1853 | ||
1854 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1855 | rt->rt6i_dst.plen = 128; | |
1856 | rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL); | |
1857 | ||
1858 | atomic_set(&rt->u.dst.__refcnt, 1); | |
1859 | ||
1860 | return rt; | |
1861 | } | |
1862 | ||
1863 | static int fib6_ifdown(struct rt6_info *rt, void *arg) | |
1864 | { | |
1865 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && | |
1866 | rt != &ip6_null_entry) { | |
1867 | RT6_TRACE("deleted by ifdown %p\n", rt); | |
1868 | return -1; | |
1869 | } | |
1870 | return 0; | |
1871 | } | |
1872 | ||
1873 | void rt6_ifdown(struct net_device *dev) | |
1874 | { | |
1875 | fib6_clean_all(fib6_ifdown, 0, dev); | |
1876 | } | |
1877 | ||
1878 | struct rt6_mtu_change_arg | |
1879 | { | |
1880 | struct net_device *dev; | |
1881 | unsigned mtu; | |
1882 | }; | |
1883 | ||
1884 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
1885 | { | |
1886 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
1887 | struct inet6_dev *idev; | |
1888 | ||
1889 | /* In IPv6 pmtu discovery is not optional, | |
1890 | so that RTAX_MTU lock cannot disable it. | |
1891 | We still use this lock to block changes | |
1892 | caused by addrconf/ndisc. | |
1893 | */ | |
1894 | ||
1895 | idev = __in6_dev_get(arg->dev); | |
1896 | if (idev == NULL) | |
1897 | return 0; | |
1898 | ||
1899 | /* For administrative MTU increase, there is no way to discover | |
1900 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
1901 | Since RFC 1981 doesn't include administrative MTU increase | |
1902 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
1903 | */ | |
1904 | /* | |
1905 | If new MTU is less than route PMTU, this new MTU will be the | |
1906 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
1907 | decreases; if new MTU is greater than route PMTU, and the | |
1908 | old MTU is the lowest MTU in the path, update the route PMTU | |
1909 | to reflect the increase. In this case if the other nodes' MTU | |
1910 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
1911 | PMTU discouvery. | |
1912 | */ | |
1913 | if (rt->rt6i_dev == arg->dev && | |
1914 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && | |
1915 | (dst_mtu(&rt->u.dst) > arg->mtu || | |
1916 | (dst_mtu(&rt->u.dst) < arg->mtu && | |
1917 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) { | |
1918 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; | |
1919 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); | |
1920 | } | |
1921 | return 0; | |
1922 | } | |
1923 | ||
1924 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
1925 | { | |
1926 | struct rt6_mtu_change_arg arg = { | |
1927 | .dev = dev, | |
1928 | .mtu = mtu, | |
1929 | }; | |
1930 | ||
1931 | fib6_clean_all(rt6_mtu_change_route, 0, &arg); | |
1932 | } | |
1933 | ||
1934 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { | |
1935 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, | |
1936 | [RTA_OIF] = { .type = NLA_U32 }, | |
1937 | [RTA_IIF] = { .type = NLA_U32 }, | |
1938 | [RTA_PRIORITY] = { .type = NLA_U32 }, | |
1939 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
1940 | }; | |
1941 | ||
1942 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
1943 | struct fib6_config *cfg) | |
1944 | { | |
1945 | struct rtmsg *rtm; | |
1946 | struct nlattr *tb[RTA_MAX+1]; | |
1947 | int err; | |
1948 | ||
1949 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); | |
1950 | if (err < 0) | |
1951 | goto errout; | |
1952 | ||
1953 | err = -EINVAL; | |
1954 | rtm = nlmsg_data(nlh); | |
1955 | memset(cfg, 0, sizeof(*cfg)); | |
1956 | ||
1957 | cfg->fc_table = rtm->rtm_table; | |
1958 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
1959 | cfg->fc_src_len = rtm->rtm_src_len; | |
1960 | cfg->fc_flags = RTF_UP; | |
1961 | cfg->fc_protocol = rtm->rtm_protocol; | |
1962 | ||
1963 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
1964 | cfg->fc_flags |= RTF_REJECT; | |
1965 | ||
1966 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; | |
1967 | cfg->fc_nlinfo.nlh = nlh; | |
1968 | ||
1969 | if (tb[RTA_GATEWAY]) { | |
1970 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
1971 | cfg->fc_flags |= RTF_GATEWAY; | |
1972 | } | |
1973 | ||
1974 | if (tb[RTA_DST]) { | |
1975 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
1976 | ||
1977 | if (nla_len(tb[RTA_DST]) < plen) | |
1978 | goto errout; | |
1979 | ||
1980 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1981 | } | |
1982 | ||
1983 | if (tb[RTA_SRC]) { | |
1984 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
1985 | ||
1986 | if (nla_len(tb[RTA_SRC]) < plen) | |
1987 | goto errout; | |
1988 | ||
1989 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1990 | } | |
1991 | ||
1992 | if (tb[RTA_OIF]) | |
1993 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
1994 | ||
1995 | if (tb[RTA_PRIORITY]) | |
1996 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
1997 | ||
1998 | if (tb[RTA_METRICS]) { | |
1999 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2000 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
2001 | } | |
2002 | ||
2003 | if (tb[RTA_TABLE]) | |
2004 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2005 | ||
2006 | err = 0; | |
2007 | errout: | |
2008 | return err; | |
2009 | } | |
2010 | ||
2011 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
2012 | { | |
2013 | struct fib6_config cfg; | |
2014 | int err; | |
2015 | ||
2016 | err = rtm_to_fib6_config(skb, nlh, &cfg); | |
2017 | if (err < 0) | |
2018 | return err; | |
2019 | ||
2020 | return ip6_route_del(&cfg); | |
2021 | } | |
2022 | ||
2023 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) | |
2024 | { | |
2025 | struct fib6_config cfg; | |
2026 | int err; | |
2027 | ||
2028 | err = rtm_to_fib6_config(skb, nlh, &cfg); | |
2029 | if (err < 0) | |
2030 | return err; | |
2031 | ||
2032 | return ip6_route_add(&cfg); | |
2033 | } | |
2034 | ||
2035 | static inline size_t rt6_nlmsg_size(void) | |
2036 | { | |
2037 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2038 | + nla_total_size(16) /* RTA_SRC */ | |
2039 | + nla_total_size(16) /* RTA_DST */ | |
2040 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2041 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2042 | + nla_total_size(4) /* RTA_TABLE */ | |
2043 | + nla_total_size(4) /* RTA_IIF */ | |
2044 | + nla_total_size(4) /* RTA_OIF */ | |
2045 | + nla_total_size(4) /* RTA_PRIORITY */ | |
2046 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ | |
2047 | + nla_total_size(sizeof(struct rta_cacheinfo)); | |
2048 | } | |
2049 | ||
2050 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, | |
2051 | struct in6_addr *dst, struct in6_addr *src, | |
2052 | int iif, int type, u32 pid, u32 seq, | |
2053 | int prefix, unsigned int flags) | |
2054 | { | |
2055 | struct rtmsg *rtm; | |
2056 | struct nlmsghdr *nlh; | |
2057 | long expires; | |
2058 | u32 table; | |
2059 | ||
2060 | if (prefix) { /* user wants prefix routes only */ | |
2061 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2062 | /* success since this is not a prefix route */ | |
2063 | return 1; | |
2064 | } | |
2065 | } | |
2066 | ||
2067 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); | |
2068 | if (nlh == NULL) | |
2069 | return -EMSGSIZE; | |
2070 | ||
2071 | rtm = nlmsg_data(nlh); | |
2072 | rtm->rtm_family = AF_INET6; | |
2073 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2074 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2075 | rtm->rtm_tos = 0; | |
2076 | if (rt->rt6i_table) | |
2077 | table = rt->rt6i_table->tb6_id; | |
2078 | else | |
2079 | table = RT6_TABLE_UNSPEC; | |
2080 | rtm->rtm_table = table; | |
2081 | NLA_PUT_U32(skb, RTA_TABLE, table); | |
2082 | if (rt->rt6i_flags&RTF_REJECT) | |
2083 | rtm->rtm_type = RTN_UNREACHABLE; | |
2084 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) | |
2085 | rtm->rtm_type = RTN_LOCAL; | |
2086 | else | |
2087 | rtm->rtm_type = RTN_UNICAST; | |
2088 | rtm->rtm_flags = 0; | |
2089 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2090 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2091 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2092 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2093 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2094 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2095 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2096 | rtm->rtm_protocol = RTPROT_RA; | |
2097 | ||
2098 | if (rt->rt6i_flags&RTF_CACHE) | |
2099 | rtm->rtm_flags |= RTM_F_CLONED; | |
2100 | ||
2101 | if (dst) { | |
2102 | NLA_PUT(skb, RTA_DST, 16, dst); | |
2103 | rtm->rtm_dst_len = 128; | |
2104 | } else if (rtm->rtm_dst_len) | |
2105 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); | |
2106 | #ifdef CONFIG_IPV6_SUBTREES | |
2107 | if (src) { | |
2108 | NLA_PUT(skb, RTA_SRC, 16, src); | |
2109 | rtm->rtm_src_len = 128; | |
2110 | } else if (rtm->rtm_src_len) | |
2111 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); | |
2112 | #endif | |
2113 | if (iif) | |
2114 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2115 | else if (dst) { | |
2116 | struct in6_addr saddr_buf; | |
2117 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) | |
2118 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); | |
2119 | } | |
2120 | ||
2121 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) | |
2122 | goto nla_put_failure; | |
2123 | ||
2124 | if (rt->u.dst.neighbour) | |
2125 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); | |
2126 | ||
2127 | if (rt->u.dst.dev) | |
2128 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); | |
2129 | ||
2130 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
2131 | ||
2132 | expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0; | |
2133 | if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0, | |
2134 | expires, rt->u.dst.error) < 0) | |
2135 | goto nla_put_failure; | |
2136 | ||
2137 | return nlmsg_end(skb, nlh); | |
2138 | ||
2139 | nla_put_failure: | |
2140 | nlmsg_cancel(skb, nlh); | |
2141 | return -EMSGSIZE; | |
2142 | } | |
2143 | ||
2144 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) | |
2145 | { | |
2146 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2147 | int prefix; | |
2148 | ||
2149 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { | |
2150 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
2151 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; | |
2152 | } else | |
2153 | prefix = 0; | |
2154 | ||
2155 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
2156 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, | |
2157 | prefix, NLM_F_MULTI); | |
2158 | } | |
2159 | ||
2160 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) | |
2161 | { | |
2162 | struct nlattr *tb[RTA_MAX+1]; | |
2163 | struct rt6_info *rt; | |
2164 | struct sk_buff *skb; | |
2165 | struct rtmsg *rtm; | |
2166 | struct flowi fl; | |
2167 | int err, iif = 0; | |
2168 | ||
2169 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); | |
2170 | if (err < 0) | |
2171 | goto errout; | |
2172 | ||
2173 | err = -EINVAL; | |
2174 | memset(&fl, 0, sizeof(fl)); | |
2175 | ||
2176 | if (tb[RTA_SRC]) { | |
2177 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2178 | goto errout; | |
2179 | ||
2180 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2181 | } | |
2182 | ||
2183 | if (tb[RTA_DST]) { | |
2184 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2185 | goto errout; | |
2186 | ||
2187 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2188 | } | |
2189 | ||
2190 | if (tb[RTA_IIF]) | |
2191 | iif = nla_get_u32(tb[RTA_IIF]); | |
2192 | ||
2193 | if (tb[RTA_OIF]) | |
2194 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
2195 | ||
2196 | if (iif) { | |
2197 | struct net_device *dev; | |
2198 | dev = __dev_get_by_index(&init_net, iif); | |
2199 | if (!dev) { | |
2200 | err = -ENODEV; | |
2201 | goto errout; | |
2202 | } | |
2203 | } | |
2204 | ||
2205 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
2206 | if (skb == NULL) { | |
2207 | err = -ENOBUFS; | |
2208 | goto errout; | |
2209 | } | |
2210 | ||
2211 | /* Reserve room for dummy headers, this skb can pass | |
2212 | through good chunk of routing engine. | |
2213 | */ | |
2214 | skb_reset_mac_header(skb); | |
2215 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); | |
2216 | ||
2217 | rt = (struct rt6_info*) ip6_route_output(NULL, &fl); | |
2218 | skb->dst = &rt->u.dst; | |
2219 | ||
2220 | err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, | |
2221 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, | |
2222 | nlh->nlmsg_seq, 0, 0); | |
2223 | if (err < 0) { | |
2224 | kfree_skb(skb); | |
2225 | goto errout; | |
2226 | } | |
2227 | ||
2228 | err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid); | |
2229 | errout: | |
2230 | return err; | |
2231 | } | |
2232 | ||
2233 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) | |
2234 | { | |
2235 | struct sk_buff *skb; | |
2236 | u32 pid = 0, seq = 0; | |
2237 | struct nlmsghdr *nlh = NULL; | |
2238 | int err = -ENOBUFS; | |
2239 | ||
2240 | if (info) { | |
2241 | pid = info->pid; | |
2242 | nlh = info->nlh; | |
2243 | if (nlh) | |
2244 | seq = nlh->nlmsg_seq; | |
2245 | } | |
2246 | ||
2247 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); | |
2248 | if (skb == NULL) | |
2249 | goto errout; | |
2250 | ||
2251 | err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0); | |
2252 | if (err < 0) { | |
2253 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2254 | WARN_ON(err == -EMSGSIZE); | |
2255 | kfree_skb(skb); | |
2256 | goto errout; | |
2257 | } | |
2258 | err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any()); | |
2259 | errout: | |
2260 | if (err < 0) | |
2261 | rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err); | |
2262 | } | |
2263 | ||
2264 | /* | |
2265 | * /proc | |
2266 | */ | |
2267 | ||
2268 | #ifdef CONFIG_PROC_FS | |
2269 | ||
2270 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) | |
2271 | ||
2272 | struct rt6_proc_arg | |
2273 | { | |
2274 | char *buffer; | |
2275 | int offset; | |
2276 | int length; | |
2277 | int skip; | |
2278 | int len; | |
2279 | }; | |
2280 | ||
2281 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2282 | { | |
2283 | struct seq_file *m = p_arg; | |
2284 | ||
2285 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr), | |
2286 | rt->rt6i_dst.plen); | |
2287 | ||
2288 | #ifdef CONFIG_IPV6_SUBTREES | |
2289 | seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr), | |
2290 | rt->rt6i_src.plen); | |
2291 | #else | |
2292 | seq_puts(m, "00000000000000000000000000000000 00 "); | |
2293 | #endif | |
2294 | ||
2295 | if (rt->rt6i_nexthop) { | |
2296 | seq_printf(m, NIP6_SEQFMT, | |
2297 | NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key))); | |
2298 | } else { | |
2299 | seq_puts(m, "00000000000000000000000000000000"); | |
2300 | } | |
2301 | seq_printf(m, " %08x %08x %08x %08x %8s\n", | |
2302 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), | |
2303 | rt->u.dst.__use, rt->rt6i_flags, | |
2304 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); | |
2305 | return 0; | |
2306 | } | |
2307 | ||
2308 | static int ipv6_route_show(struct seq_file *m, void *v) | |
2309 | { | |
2310 | fib6_clean_all(rt6_info_route, 0, m); | |
2311 | return 0; | |
2312 | } | |
2313 | ||
2314 | static int ipv6_route_open(struct inode *inode, struct file *file) | |
2315 | { | |
2316 | return single_open(file, ipv6_route_show, NULL); | |
2317 | } | |
2318 | ||
2319 | static const struct file_operations ipv6_route_proc_fops = { | |
2320 | .owner = THIS_MODULE, | |
2321 | .open = ipv6_route_open, | |
2322 | .read = seq_read, | |
2323 | .llseek = seq_lseek, | |
2324 | .release = single_release, | |
2325 | }; | |
2326 | ||
2327 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) | |
2328 | { | |
2329 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", | |
2330 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, | |
2331 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, | |
2332 | rt6_stats.fib_rt_cache, | |
2333 | atomic_read(&ip6_dst_ops.entries), | |
2334 | rt6_stats.fib_discarded_routes); | |
2335 | ||
2336 | return 0; | |
2337 | } | |
2338 | ||
2339 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2340 | { | |
2341 | return single_open(file, rt6_stats_seq_show, NULL); | |
2342 | } | |
2343 | ||
2344 | static const struct file_operations rt6_stats_seq_fops = { | |
2345 | .owner = THIS_MODULE, | |
2346 | .open = rt6_stats_seq_open, | |
2347 | .read = seq_read, | |
2348 | .llseek = seq_lseek, | |
2349 | .release = single_release, | |
2350 | }; | |
2351 | #endif /* CONFIG_PROC_FS */ | |
2352 | ||
2353 | #ifdef CONFIG_SYSCTL | |
2354 | ||
2355 | static int flush_delay; | |
2356 | ||
2357 | static | |
2358 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, | |
2359 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2360 | { | |
2361 | if (write) { | |
2362 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
2363 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); | |
2364 | return 0; | |
2365 | } else | |
2366 | return -EINVAL; | |
2367 | } | |
2368 | ||
2369 | ctl_table ipv6_route_table[] = { | |
2370 | { | |
2371 | .procname = "flush", | |
2372 | .data = &flush_delay, | |
2373 | .maxlen = sizeof(int), | |
2374 | .mode = 0200, | |
2375 | .proc_handler = &ipv6_sysctl_rtcache_flush | |
2376 | }, | |
2377 | { | |
2378 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, | |
2379 | .procname = "gc_thresh", | |
2380 | .data = &ip6_dst_ops.gc_thresh, | |
2381 | .maxlen = sizeof(int), | |
2382 | .mode = 0644, | |
2383 | .proc_handler = &proc_dointvec, | |
2384 | }, | |
2385 | { | |
2386 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, | |
2387 | .procname = "max_size", | |
2388 | .data = &ip6_rt_max_size, | |
2389 | .maxlen = sizeof(int), | |
2390 | .mode = 0644, | |
2391 | .proc_handler = &proc_dointvec, | |
2392 | }, | |
2393 | { | |
2394 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, | |
2395 | .procname = "gc_min_interval", | |
2396 | .data = &ip6_rt_gc_min_interval, | |
2397 | .maxlen = sizeof(int), | |
2398 | .mode = 0644, | |
2399 | .proc_handler = &proc_dointvec_jiffies, | |
2400 | .strategy = &sysctl_jiffies, | |
2401 | }, | |
2402 | { | |
2403 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, | |
2404 | .procname = "gc_timeout", | |
2405 | .data = &ip6_rt_gc_timeout, | |
2406 | .maxlen = sizeof(int), | |
2407 | .mode = 0644, | |
2408 | .proc_handler = &proc_dointvec_jiffies, | |
2409 | .strategy = &sysctl_jiffies, | |
2410 | }, | |
2411 | { | |
2412 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, | |
2413 | .procname = "gc_interval", | |
2414 | .data = &ip6_rt_gc_interval, | |
2415 | .maxlen = sizeof(int), | |
2416 | .mode = 0644, | |
2417 | .proc_handler = &proc_dointvec_jiffies, | |
2418 | .strategy = &sysctl_jiffies, | |
2419 | }, | |
2420 | { | |
2421 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, | |
2422 | .procname = "gc_elasticity", | |
2423 | .data = &ip6_rt_gc_elasticity, | |
2424 | .maxlen = sizeof(int), | |
2425 | .mode = 0644, | |
2426 | .proc_handler = &proc_dointvec_jiffies, | |
2427 | .strategy = &sysctl_jiffies, | |
2428 | }, | |
2429 | { | |
2430 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, | |
2431 | .procname = "mtu_expires", | |
2432 | .data = &ip6_rt_mtu_expires, | |
2433 | .maxlen = sizeof(int), | |
2434 | .mode = 0644, | |
2435 | .proc_handler = &proc_dointvec_jiffies, | |
2436 | .strategy = &sysctl_jiffies, | |
2437 | }, | |
2438 | { | |
2439 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, | |
2440 | .procname = "min_adv_mss", | |
2441 | .data = &ip6_rt_min_advmss, | |
2442 | .maxlen = sizeof(int), | |
2443 | .mode = 0644, | |
2444 | .proc_handler = &proc_dointvec_jiffies, | |
2445 | .strategy = &sysctl_jiffies, | |
2446 | }, | |
2447 | { | |
2448 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, | |
2449 | .procname = "gc_min_interval_ms", | |
2450 | .data = &ip6_rt_gc_min_interval, | |
2451 | .maxlen = sizeof(int), | |
2452 | .mode = 0644, | |
2453 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2454 | .strategy = &sysctl_ms_jiffies, | |
2455 | }, | |
2456 | { .ctl_name = 0 } | |
2457 | }; | |
2458 | ||
2459 | #endif | |
2460 | ||
2461 | void __init ip6_route_init(void) | |
2462 | { | |
2463 | ip6_dst_ops.kmem_cachep = | |
2464 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, | |
2465 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); | |
2466 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep; | |
2467 | ||
2468 | fib6_init(); | |
2469 | proc_net_fops_create(&init_net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2470 | proc_net_fops_create(&init_net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2471 | #ifdef CONFIG_XFRM | |
2472 | xfrm6_init(); | |
2473 | #endif | |
2474 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2475 | fib6_rules_init(); | |
2476 | #endif | |
2477 | ||
2478 | __rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL); | |
2479 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL); | |
2480 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL); | |
2481 | } | |
2482 | ||
2483 | void ip6_route_cleanup(void) | |
2484 | { | |
2485 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2486 | fib6_rules_cleanup(); | |
2487 | #endif | |
2488 | #ifdef CONFIG_PROC_FS | |
2489 | proc_net_remove(&init_net, "ipv6_route"); | |
2490 | proc_net_remove(&init_net, "rt6_stats"); | |
2491 | #endif | |
2492 | #ifdef CONFIG_XFRM | |
2493 | xfrm6_fini(); | |
2494 | #endif | |
2495 | rt6_ifdown(NULL); | |
2496 | fib6_gc_cleanup(); | |
2497 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); | |
2498 | } |