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cifs: remove unneeded variable initialization in cifs_reconnect_tcon
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / route.c
blobe8987da06667225e44dae0cbfaf7fc51490788d7
1 /*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 /* Changes:
15 *
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
23 * Ville Nuorvala
24 * Fixed routing subtrees.
25 */
26
27 #include <linux/capability.h>
28 #include <linux/errno.h>
29 #include <linux/types.h>
30 #include <linux/times.h>
31 #include <linux/socket.h>
32 #include <linux/sockios.h>
33 #include <linux/net.h>
34 #include <linux/route.h>
35 #include <linux/netdevice.h>
36 #include <linux/in6.h>
37 #include <linux/mroute6.h>
38 #include <linux/init.h>
39 #include <linux/if_arp.h>
40 #include <linux/proc_fs.h>
41 #include <linux/seq_file.h>
42 #include <linux/nsproxy.h>
43 #include <linux/slab.h>
44 #include <net/net_namespace.h>
45 #include <net/snmp.h>
46 #include <net/ipv6.h>
47 #include <net/ip6_fib.h>
48 #include <net/ip6_route.h>
49 #include <net/ndisc.h>
50 #include <net/addrconf.h>
51 #include <net/tcp.h>
52 #include <linux/rtnetlink.h>
53 #include <net/dst.h>
54 #include <net/xfrm.h>
55 #include <net/netevent.h>
56 #include <net/netlink.h>
57
58 #include <asm/uaccess.h>
59
60 #ifdef CONFIG_SYSCTL
61 #include <linux/sysctl.h>
62 #endif
63
64 /* Set to 3 to get tracing. */
65 #define RT6_DEBUG 2
66
67 #if RT6_DEBUG >= 3
68 #define RDBG(x) printk x
69 #define RT6_TRACE(x...) printk(KERN_DEBUG x)
70 #else
71 #define RDBG(x)
72 #define RT6_TRACE(x...) do { ; } while (0)
73 #endif
74
75 static struct rt6_info *ip6_rt_copy(const struct rt6_info *ort,
76 const struct in6_addr *dest);
77 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
78 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
79 static unsigned int ip6_default_mtu(const struct dst_entry *dst);
80 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
81 static void ip6_dst_destroy(struct dst_entry *);
82 static void ip6_dst_ifdown(struct dst_entry *,
83 struct net_device *dev, int how);
84 static int ip6_dst_gc(struct dst_ops *ops);
85
86 static int ip6_pkt_discard(struct sk_buff *skb);
87 static int ip6_pkt_discard_out(struct sk_buff *skb);
88 static void ip6_link_failure(struct sk_buff *skb);
89 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
90
91 #ifdef CONFIG_IPV6_ROUTE_INFO
92 static struct rt6_info *rt6_add_route_info(struct net *net,
93 const struct in6_addr *prefix, int prefixlen,
94 const struct in6_addr *gwaddr, int ifindex,
95 unsigned pref);
96 static struct rt6_info *rt6_get_route_info(struct net *net,
97 const struct in6_addr *prefix, int prefixlen,
98 const struct in6_addr *gwaddr, int ifindex);
99 #endif
100
101 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
102 {
103 struct rt6_info *rt = (struct rt6_info *) dst;
104 struct inet_peer *peer;
105 u32 *p = NULL;
106
107 if (!rt->rt6i_peer)
108 rt6_bind_peer(rt, 1);
109
110 peer = rt->rt6i_peer;
111 if (peer) {
112 u32 *old_p = __DST_METRICS_PTR(old);
113 unsigned long prev, new;
114
115 p = peer->metrics;
116 if (inet_metrics_new(peer))
117 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
118
119 new = (unsigned long) p;
120 prev = cmpxchg(&dst->_metrics, old, new);
121
122 if (prev != old) {
123 p = __DST_METRICS_PTR(prev);
124 if (prev & DST_METRICS_READ_ONLY)
125 p = NULL;
126 }
127 }
128 return p;
129 }
130
131 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const void *daddr)
132 {
133 return __neigh_lookup_errno(&nd_tbl, daddr, dst->dev);
134 }
135
136 static struct dst_ops ip6_dst_ops_template = {
137 .family = AF_INET6,
138 .protocol = cpu_to_be16(ETH_P_IPV6),
139 .gc = ip6_dst_gc,
140 .gc_thresh = 1024,
141 .check = ip6_dst_check,
142 .default_advmss = ip6_default_advmss,
143 .default_mtu = ip6_default_mtu,
144 .cow_metrics = ipv6_cow_metrics,
145 .destroy = ip6_dst_destroy,
146 .ifdown = ip6_dst_ifdown,
147 .negative_advice = ip6_negative_advice,
148 .link_failure = ip6_link_failure,
149 .update_pmtu = ip6_rt_update_pmtu,
150 .local_out = __ip6_local_out,
151 .neigh_lookup = ip6_neigh_lookup,
152 };
153
154 static unsigned int ip6_blackhole_default_mtu(const struct dst_entry *dst)
155 {
156 return 0;
157 }
158
159 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
160 {
161 }
162
163 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
164 unsigned long old)
165 {
166 return NULL;
167 }
168
169 static struct dst_ops ip6_dst_blackhole_ops = {
170 .family = AF_INET6,
171 .protocol = cpu_to_be16(ETH_P_IPV6),
172 .destroy = ip6_dst_destroy,
173 .check = ip6_dst_check,
174 .default_mtu = ip6_blackhole_default_mtu,
175 .default_advmss = ip6_default_advmss,
176 .update_pmtu = ip6_rt_blackhole_update_pmtu,
177 .cow_metrics = ip6_rt_blackhole_cow_metrics,
178 .neigh_lookup = ip6_neigh_lookup,
179 };
180
181 static const u32 ip6_template_metrics[RTAX_MAX] = {
182 [RTAX_HOPLIMIT - 1] = 255,
183 };
184
185 static struct rt6_info ip6_null_entry_template = {
186 .dst = {
187 .__refcnt = ATOMIC_INIT(1),
188 .__use = 1,
189 .obsolete = -1,
190 .error = -ENETUNREACH,
191 .input = ip6_pkt_discard,
192 .output = ip6_pkt_discard_out,
193 },
194 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
195 .rt6i_protocol = RTPROT_KERNEL,
196 .rt6i_metric = ~(u32) 0,
197 .rt6i_ref = ATOMIC_INIT(1),
198 };
199
200 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
201
202 static int ip6_pkt_prohibit(struct sk_buff *skb);
203 static int ip6_pkt_prohibit_out(struct sk_buff *skb);
204
205 static struct rt6_info ip6_prohibit_entry_template = {
206 .dst = {
207 .__refcnt = ATOMIC_INIT(1),
208 .__use = 1,
209 .obsolete = -1,
210 .error = -EACCES,
211 .input = ip6_pkt_prohibit,
212 .output = ip6_pkt_prohibit_out,
213 },
214 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
215 .rt6i_protocol = RTPROT_KERNEL,
216 .rt6i_metric = ~(u32) 0,
217 .rt6i_ref = ATOMIC_INIT(1),
218 };
219
220 static struct rt6_info ip6_blk_hole_entry_template = {
221 .dst = {
222 .__refcnt = ATOMIC_INIT(1),
223 .__use = 1,
224 .obsolete = -1,
225 .error = -EINVAL,
226 .input = dst_discard,
227 .output = dst_discard,
228 },
229 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
230 .rt6i_protocol = RTPROT_KERNEL,
231 .rt6i_metric = ~(u32) 0,
232 .rt6i_ref = ATOMIC_INIT(1),
233 };
234
235 #endif
236
237 /* allocate dst with ip6_dst_ops */
238 static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops,
239 struct net_device *dev,
240 int flags)
241 {
242 struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, flags);
243
244 memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry));
245
246 return rt;
247 }
248
249 static void ip6_dst_destroy(struct dst_entry *dst)
250 {
251 struct rt6_info *rt = (struct rt6_info *)dst;
252 struct inet6_dev *idev = rt->rt6i_idev;
253 struct inet_peer *peer = rt->rt6i_peer;
254
255 if (idev != NULL) {
256 rt->rt6i_idev = NULL;
257 in6_dev_put(idev);
258 }
259 if (peer) {
260 rt->rt6i_peer = NULL;
261 inet_putpeer(peer);
262 }
263 }
264
265 static atomic_t __rt6_peer_genid = ATOMIC_INIT(0);
266
267 static u32 rt6_peer_genid(void)
268 {
269 return atomic_read(&__rt6_peer_genid);
270 }
271
272 void rt6_bind_peer(struct rt6_info *rt, int create)
273 {
274 struct inet_peer *peer;
275
276 peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create);
277 if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL)
278 inet_putpeer(peer);
279 else
280 rt->rt6i_peer_genid = rt6_peer_genid();
281 }
282
283 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
284 int how)
285 {
286 struct rt6_info *rt = (struct rt6_info *)dst;
287 struct inet6_dev *idev = rt->rt6i_idev;
288 struct net_device *loopback_dev =
289 dev_net(dev)->loopback_dev;
290
291 if (dev != loopback_dev && idev != NULL && idev->dev == dev) {
292 struct inet6_dev *loopback_idev =
293 in6_dev_get(loopback_dev);
294 if (loopback_idev != NULL) {
295 rt->rt6i_idev = loopback_idev;
296 in6_dev_put(idev);
297 }
298 }
299 }
300
301 static __inline__ int rt6_check_expired(const struct rt6_info *rt)
302 {
303 return (rt->rt6i_flags & RTF_EXPIRES) &&
304 time_after(jiffies, rt->rt6i_expires);
305 }
306
307 static inline int rt6_need_strict(const struct in6_addr *daddr)
308 {
309 return ipv6_addr_type(daddr) &
310 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
311 }
312
313 /*
314 * Route lookup. Any table->tb6_lock is implied.
315 */
316
317 static inline struct rt6_info *rt6_device_match(struct net *net,
318 struct rt6_info *rt,
319 const struct in6_addr *saddr,
320 int oif,
321 int flags)
322 {
323 struct rt6_info *local = NULL;
324 struct rt6_info *sprt;
325
326 if (!oif && ipv6_addr_any(saddr))
327 goto out;
328
329 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
330 struct net_device *dev = sprt->rt6i_dev;
331
332 if (oif) {
333 if (dev->ifindex == oif)
334 return sprt;
335 if (dev->flags & IFF_LOOPBACK) {
336 if (sprt->rt6i_idev == NULL ||
337 sprt->rt6i_idev->dev->ifindex != oif) {
338 if (flags & RT6_LOOKUP_F_IFACE && oif)
339 continue;
340 if (local && (!oif ||
341 local->rt6i_idev->dev->ifindex == oif))
342 continue;
343 }
344 local = sprt;
345 }
346 } else {
347 if (ipv6_chk_addr(net, saddr, dev,
348 flags & RT6_LOOKUP_F_IFACE))
349 return sprt;
350 }
351 }
352
353 if (oif) {
354 if (local)
355 return local;
356
357 if (flags & RT6_LOOKUP_F_IFACE)
358 return net->ipv6.ip6_null_entry;
359 }
360 out:
361 return rt;
362 }
363
364 #ifdef CONFIG_IPV6_ROUTER_PREF
365 static void rt6_probe(struct rt6_info *rt)
366 {
367 struct neighbour *neigh = rt ? dst_get_neighbour(&rt->dst) : NULL;
368 /*
369 * Okay, this does not seem to be appropriate
370 * for now, however, we need to check if it
371 * is really so; aka Router Reachability Probing.
372 *
373 * Router Reachability Probe MUST be rate-limited
374 * to no more than one per minute.
375 */
376 if (!neigh || (neigh->nud_state & NUD_VALID))
377 return;
378 read_lock_bh(&neigh->lock);
379 if (!(neigh->nud_state & NUD_VALID) &&
380 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
381 struct in6_addr mcaddr;
382 struct in6_addr *target;
383
384 neigh->updated = jiffies;
385 read_unlock_bh(&neigh->lock);
386
387 target = (struct in6_addr *)&neigh->primary_key;
388 addrconf_addr_solict_mult(target, &mcaddr);
389 ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL);
390 } else
391 read_unlock_bh(&neigh->lock);
392 }
393 #else
394 static inline void rt6_probe(struct rt6_info *rt)
395 {
396 }
397 #endif
398
399 /*
400 * Default Router Selection (RFC 2461 6.3.6)
401 */
402 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
403 {
404 struct net_device *dev = rt->rt6i_dev;
405 if (!oif || dev->ifindex == oif)
406 return 2;
407 if ((dev->flags & IFF_LOOPBACK) &&
408 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
409 return 1;
410 return 0;
411 }
412
413 static inline int rt6_check_neigh(struct rt6_info *rt)
414 {
415 struct neighbour *neigh = dst_get_neighbour(&rt->dst);
416 int m;
417 if (rt->rt6i_flags & RTF_NONEXTHOP ||
418 !(rt->rt6i_flags & RTF_GATEWAY))
419 m = 1;
420 else if (neigh) {
421 read_lock_bh(&neigh->lock);
422 if (neigh->nud_state & NUD_VALID)
423 m = 2;
424 #ifdef CONFIG_IPV6_ROUTER_PREF
425 else if (neigh->nud_state & NUD_FAILED)
426 m = 0;
427 #endif
428 else
429 m = 1;
430 read_unlock_bh(&neigh->lock);
431 } else
432 m = 0;
433 return m;
434 }
435
436 static int rt6_score_route(struct rt6_info *rt, int oif,
437 int strict)
438 {
439 int m, n;
440
441 m = rt6_check_dev(rt, oif);
442 if (!m && (strict & RT6_LOOKUP_F_IFACE))
443 return -1;
444 #ifdef CONFIG_IPV6_ROUTER_PREF
445 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
446 #endif
447 n = rt6_check_neigh(rt);
448 if (!n && (strict & RT6_LOOKUP_F_REACHABLE))
449 return -1;
450 return m;
451 }
452
453 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
454 int *mpri, struct rt6_info *match)
455 {
456 int m;
457
458 if (rt6_check_expired(rt))
459 goto out;
460
461 m = rt6_score_route(rt, oif, strict);
462 if (m < 0)
463 goto out;
464
465 if (m > *mpri) {
466 if (strict & RT6_LOOKUP_F_REACHABLE)
467 rt6_probe(match);
468 *mpri = m;
469 match = rt;
470 } else if (strict & RT6_LOOKUP_F_REACHABLE) {
471 rt6_probe(rt);
472 }
473
474 out:
475 return match;
476 }
477
478 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
479 struct rt6_info *rr_head,
480 u32 metric, int oif, int strict)
481 {
482 struct rt6_info *rt, *match;
483 int mpri = -1;
484
485 match = NULL;
486 for (rt = rr_head; rt && rt->rt6i_metric == metric;
487 rt = rt->dst.rt6_next)
488 match = find_match(rt, oif, strict, &mpri, match);
489 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
490 rt = rt->dst.rt6_next)
491 match = find_match(rt, oif, strict, &mpri, match);
492
493 return match;
494 }
495
496 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
497 {
498 struct rt6_info *match, *rt0;
499 struct net *net;
500
501 RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n",
502 __func__, fn->leaf, oif);
503
504 rt0 = fn->rr_ptr;
505 if (!rt0)
506 fn->rr_ptr = rt0 = fn->leaf;
507
508 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict);
509
510 if (!match &&
511 (strict & RT6_LOOKUP_F_REACHABLE)) {
512 struct rt6_info *next = rt0->dst.rt6_next;
513
514 /* no entries matched; do round-robin */
515 if (!next || next->rt6i_metric != rt0->rt6i_metric)
516 next = fn->leaf;
517
518 if (next != rt0)
519 fn->rr_ptr = next;
520 }
521
522 RT6_TRACE("%s() => %p\n",
523 __func__, match);
524
525 net = dev_net(rt0->rt6i_dev);
526 return match ? match : net->ipv6.ip6_null_entry;
527 }
528
529 #ifdef CONFIG_IPV6_ROUTE_INFO
530 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
531 const struct in6_addr *gwaddr)
532 {
533 struct net *net = dev_net(dev);
534 struct route_info *rinfo = (struct route_info *) opt;
535 struct in6_addr prefix_buf, *prefix;
536 unsigned int pref;
537 unsigned long lifetime;
538 struct rt6_info *rt;
539
540 if (len < sizeof(struct route_info)) {
541 return -EINVAL;
542 }
543
544 /* Sanity check for prefix_len and length */
545 if (rinfo->length > 3) {
546 return -EINVAL;
547 } else if (rinfo->prefix_len > 128) {
548 return -EINVAL;
549 } else if (rinfo->prefix_len > 64) {
550 if (rinfo->length < 2) {
551 return -EINVAL;
552 }
553 } else if (rinfo->prefix_len > 0) {
554 if (rinfo->length < 1) {
555 return -EINVAL;
556 }
557 }
558
559 pref = rinfo->route_pref;
560 if (pref == ICMPV6_ROUTER_PREF_INVALID)
561 return -EINVAL;
562
563 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
564
565 if (rinfo->length == 3)
566 prefix = (struct in6_addr *)rinfo->prefix;
567 else {
568 /* this function is safe */
569 ipv6_addr_prefix(&prefix_buf,
570 (struct in6_addr *)rinfo->prefix,
571 rinfo->prefix_len);
572 prefix = &prefix_buf;
573 }
574
575 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
576 dev->ifindex);
577
578 if (rt && !lifetime) {
579 ip6_del_rt(rt);
580 rt = NULL;
581 }
582
583 if (!rt && lifetime)
584 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
585 pref);
586 else if (rt)
587 rt->rt6i_flags = RTF_ROUTEINFO |
588 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
589
590 if (rt) {
591 if (!addrconf_finite_timeout(lifetime)) {
592 rt->rt6i_flags &= ~RTF_EXPIRES;
593 } else {
594 rt->rt6i_expires = jiffies + HZ * lifetime;
595 rt->rt6i_flags |= RTF_EXPIRES;
596 }
597 dst_release(&rt->dst);
598 }
599 return 0;
600 }
601 #endif
602
603 #define BACKTRACK(__net, saddr) \
604 do { \
605 if (rt == __net->ipv6.ip6_null_entry) { \
606 struct fib6_node *pn; \
607 while (1) { \
608 if (fn->fn_flags & RTN_TL_ROOT) \
609 goto out; \
610 pn = fn->parent; \
611 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
612 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
613 else \
614 fn = pn; \
615 if (fn->fn_flags & RTN_RTINFO) \
616 goto restart; \
617 } \
618 } \
619 } while(0)
620
621 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
622 struct fib6_table *table,
623 struct flowi6 *fl6, int flags)
624 {
625 struct fib6_node *fn;
626 struct rt6_info *rt;
627
628 read_lock_bh(&table->tb6_lock);
629 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
630 restart:
631 rt = fn->leaf;
632 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
633 BACKTRACK(net, &fl6->saddr);
634 out:
635 dst_use(&rt->dst, jiffies);
636 read_unlock_bh(&table->tb6_lock);
637 return rt;
638
639 }
640
641 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
642 const struct in6_addr *saddr, int oif, int strict)
643 {
644 struct flowi6 fl6 = {
645 .flowi6_oif = oif,
646 .daddr = *daddr,
647 };
648 struct dst_entry *dst;
649 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
650
651 if (saddr) {
652 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
653 flags |= RT6_LOOKUP_F_HAS_SADDR;
654 }
655
656 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
657 if (dst->error == 0)
658 return (struct rt6_info *) dst;
659
660 dst_release(dst);
661
662 return NULL;
663 }
664
665 EXPORT_SYMBOL(rt6_lookup);
666
667 /* ip6_ins_rt is called with FREE table->tb6_lock.
668 It takes new route entry, the addition fails by any reason the
669 route is freed. In any case, if caller does not hold it, it may
670 be destroyed.
671 */
672
673 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
674 {
675 int err;
676 struct fib6_table *table;
677
678 table = rt->rt6i_table;
679 write_lock_bh(&table->tb6_lock);
680 err = fib6_add(&table->tb6_root, rt, info);
681 write_unlock_bh(&table->tb6_lock);
682
683 return err;
684 }
685
686 int ip6_ins_rt(struct rt6_info *rt)
687 {
688 struct nl_info info = {
689 .nl_net = dev_net(rt->rt6i_dev),
690 };
691 return __ip6_ins_rt(rt, &info);
692 }
693
694 static struct rt6_info *rt6_alloc_cow(const struct rt6_info *ort,
695 const struct in6_addr *daddr,
696 const struct in6_addr *saddr)
697 {
698 struct rt6_info *rt;
699
700 /*
701 * Clone the route.
702 */
703
704 rt = ip6_rt_copy(ort, daddr);
705
706 if (rt) {
707 struct neighbour *neigh;
708 int attempts = !in_softirq();
709
710 if (!(rt->rt6i_flags&RTF_GATEWAY)) {
711 if (rt->rt6i_dst.plen != 128 &&
712 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
713 rt->rt6i_flags |= RTF_ANYCAST;
714 ipv6_addr_copy(&rt->rt6i_gateway, daddr);
715 }
716
717 rt->rt6i_dst.plen = 128;
718 rt->rt6i_flags |= RTF_CACHE;
719 rt->dst.flags |= DST_HOST;
720
721 #ifdef CONFIG_IPV6_SUBTREES
722 if (rt->rt6i_src.plen && saddr) {
723 ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
724 rt->rt6i_src.plen = 128;
725 }
726 #endif
727
728 retry:
729 neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
730 if (IS_ERR(neigh)) {
731 struct net *net = dev_net(rt->rt6i_dev);
732 int saved_rt_min_interval =
733 net->ipv6.sysctl.ip6_rt_gc_min_interval;
734 int saved_rt_elasticity =
735 net->ipv6.sysctl.ip6_rt_gc_elasticity;
736
737 if (attempts-- > 0) {
738 net->ipv6.sysctl.ip6_rt_gc_elasticity = 1;
739 net->ipv6.sysctl.ip6_rt_gc_min_interval = 0;
740
741 ip6_dst_gc(&net->ipv6.ip6_dst_ops);
742
743 net->ipv6.sysctl.ip6_rt_gc_elasticity =
744 saved_rt_elasticity;
745 net->ipv6.sysctl.ip6_rt_gc_min_interval =
746 saved_rt_min_interval;
747 goto retry;
748 }
749
750 if (net_ratelimit())
751 printk(KERN_WARNING
752 "ipv6: Neighbour table overflow.\n");
753 dst_free(&rt->dst);
754 return NULL;
755 }
756 dst_set_neighbour(&rt->dst, neigh);
757
758 }
759
760 return rt;
761 }
762
763 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
764 const struct in6_addr *daddr)
765 {
766 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
767
768 if (rt) {
769 rt->rt6i_dst.plen = 128;
770 rt->rt6i_flags |= RTF_CACHE;
771 rt->dst.flags |= DST_HOST;
772 dst_set_neighbour(&rt->dst, neigh_clone(dst_get_neighbour(&ort->dst)));
773 }
774 return rt;
775 }
776
777 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
778 struct flowi6 *fl6, int flags)
779 {
780 struct fib6_node *fn;
781 struct rt6_info *rt, *nrt;
782 int strict = 0;
783 int attempts = 3;
784 int err;
785 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
786
787 strict |= flags & RT6_LOOKUP_F_IFACE;
788
789 relookup:
790 read_lock_bh(&table->tb6_lock);
791
792 restart_2:
793 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
794
795 restart:
796 rt = rt6_select(fn, oif, strict | reachable);
797
798 BACKTRACK(net, &fl6->saddr);
799 if (rt == net->ipv6.ip6_null_entry ||
800 rt->rt6i_flags & RTF_CACHE)
801 goto out;
802
803 dst_hold(&rt->dst);
804 read_unlock_bh(&table->tb6_lock);
805
806 if (!dst_get_neighbour(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP))
807 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
808 else if (!(rt->dst.flags & DST_HOST))
809 nrt = rt6_alloc_clone(rt, &fl6->daddr);
810 else
811 goto out2;
812
813 dst_release(&rt->dst);
814 rt = nrt ? : net->ipv6.ip6_null_entry;
815
816 dst_hold(&rt->dst);
817 if (nrt) {
818 err = ip6_ins_rt(nrt);
819 if (!err)
820 goto out2;
821 }
822
823 if (--attempts <= 0)
824 goto out2;
825
826 /*
827 * Race condition! In the gap, when table->tb6_lock was
828 * released someone could insert this route. Relookup.
829 */
830 dst_release(&rt->dst);
831 goto relookup;
832
833 out:
834 if (reachable) {
835 reachable = 0;
836 goto restart_2;
837 }
838 dst_hold(&rt->dst);
839 read_unlock_bh(&table->tb6_lock);
840 out2:
841 rt->dst.lastuse = jiffies;
842 rt->dst.__use++;
843
844 return rt;
845 }
846
847 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
848 struct flowi6 *fl6, int flags)
849 {
850 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
851 }
852
853 void ip6_route_input(struct sk_buff *skb)
854 {
855 const struct ipv6hdr *iph = ipv6_hdr(skb);
856 struct net *net = dev_net(skb->dev);
857 int flags = RT6_LOOKUP_F_HAS_SADDR;
858 struct flowi6 fl6 = {
859 .flowi6_iif = skb->dev->ifindex,
860 .daddr = iph->daddr,
861 .saddr = iph->saddr,
862 .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK,
863 .flowi6_mark = skb->mark,
864 .flowi6_proto = iph->nexthdr,
865 };
866
867 if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG)
868 flags |= RT6_LOOKUP_F_IFACE;
869
870 skb_dst_set(skb, fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_input));
871 }
872
873 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
874 struct flowi6 *fl6, int flags)
875 {
876 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
877 }
878
879 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
880 struct flowi6 *fl6)
881 {
882 int flags = 0;
883
884 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
885 flags |= RT6_LOOKUP_F_IFACE;
886
887 if (!ipv6_addr_any(&fl6->saddr))
888 flags |= RT6_LOOKUP_F_HAS_SADDR;
889 else if (sk)
890 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
891
892 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
893 }
894
895 EXPORT_SYMBOL(ip6_route_output);
896
897 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
898 {
899 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
900 struct dst_entry *new = NULL;
901
902 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, 0, 0);
903 if (rt) {
904 memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry));
905
906 new = &rt->dst;
907
908 new->__use = 1;
909 new->input = dst_discard;
910 new->output = dst_discard;
911
912 if (dst_metrics_read_only(&ort->dst))
913 new->_metrics = ort->dst._metrics;
914 else
915 dst_copy_metrics(new, &ort->dst);
916 rt->rt6i_idev = ort->rt6i_idev;
917 if (rt->rt6i_idev)
918 in6_dev_hold(rt->rt6i_idev);
919 rt->rt6i_expires = 0;
920
921 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
922 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
923 rt->rt6i_metric = 0;
924
925 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
926 #ifdef CONFIG_IPV6_SUBTREES
927 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
928 #endif
929
930 dst_free(new);
931 }
932
933 dst_release(dst_orig);
934 return new ? new : ERR_PTR(-ENOMEM);
935 }
936
937 /*
938 * Destination cache support functions
939 */
940
941 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
942 {
943 struct rt6_info *rt;
944
945 rt = (struct rt6_info *) dst;
946
947 if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) {
948 if (rt->rt6i_peer_genid != rt6_peer_genid()) {
949 if (!rt->rt6i_peer)
950 rt6_bind_peer(rt, 0);
951 rt->rt6i_peer_genid = rt6_peer_genid();
952 }
953 return dst;
954 }
955 return NULL;
956 }
957
958 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
959 {
960 struct rt6_info *rt = (struct rt6_info *) dst;
961
962 if (rt) {
963 if (rt->rt6i_flags & RTF_CACHE) {
964 if (rt6_check_expired(rt)) {
965 ip6_del_rt(rt);
966 dst = NULL;
967 }
968 } else {
969 dst_release(dst);
970 dst = NULL;
971 }
972 }
973 return dst;
974 }
975
976 static void ip6_link_failure(struct sk_buff *skb)
977 {
978 struct rt6_info *rt;
979
980 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
981
982 rt = (struct rt6_info *) skb_dst(skb);
983 if (rt) {
984 if (rt->rt6i_flags&RTF_CACHE) {
985 dst_set_expires(&rt->dst, 0);
986 rt->rt6i_flags |= RTF_EXPIRES;
987 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
988 rt->rt6i_node->fn_sernum = -1;
989 }
990 }
991
992 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
993 {
994 struct rt6_info *rt6 = (struct rt6_info*)dst;
995
996 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
997 rt6->rt6i_flags |= RTF_MODIFIED;
998 if (mtu < IPV6_MIN_MTU) {
999 u32 features = dst_metric(dst, RTAX_FEATURES);
1000 mtu = IPV6_MIN_MTU;
1001 features |= RTAX_FEATURE_ALLFRAG;
1002 dst_metric_set(dst, RTAX_FEATURES, features);
1003 }
1004 dst_metric_set(dst, RTAX_MTU, mtu);
1005 }
1006 }
1007
1008 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1009 {
1010 struct net_device *dev = dst->dev;
1011 unsigned int mtu = dst_mtu(dst);
1012 struct net *net = dev_net(dev);
1013
1014 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1015
1016 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1017 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1018
1019 /*
1020 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1021 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1022 * IPV6_MAXPLEN is also valid and means: "any MSS,
1023 * rely only on pmtu discovery"
1024 */
1025 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1026 mtu = IPV6_MAXPLEN;
1027 return mtu;
1028 }
1029
1030 static unsigned int ip6_default_mtu(const struct dst_entry *dst)
1031 {
1032 unsigned int mtu = IPV6_MIN_MTU;
1033 struct inet6_dev *idev;
1034
1035 rcu_read_lock();
1036 idev = __in6_dev_get(dst->dev);
1037 if (idev)
1038 mtu = idev->cnf.mtu6;
1039 rcu_read_unlock();
1040
1041 return mtu;
1042 }
1043
1044 static struct dst_entry *icmp6_dst_gc_list;
1045 static DEFINE_SPINLOCK(icmp6_dst_lock);
1046
1047 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1048 struct neighbour *neigh,
1049 const struct in6_addr *addr)
1050 {
1051 struct rt6_info *rt;
1052 struct inet6_dev *idev = in6_dev_get(dev);
1053 struct net *net = dev_net(dev);
1054
1055 if (unlikely(idev == NULL))
1056 return NULL;
1057
1058 rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev, 0);
1059 if (unlikely(rt == NULL)) {
1060 in6_dev_put(idev);
1061 goto out;
1062 }
1063
1064 if (neigh)
1065 neigh_hold(neigh);
1066 else {
1067 neigh = ndisc_get_neigh(dev, addr);
1068 if (IS_ERR(neigh))
1069 neigh = NULL;
1070 }
1071
1072 rt->rt6i_idev = idev;
1073 dst_set_neighbour(&rt->dst, neigh);
1074 atomic_set(&rt->dst.__refcnt, 1);
1075 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
1076 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255);
1077 rt->dst.output = ip6_output;
1078
1079 spin_lock_bh(&icmp6_dst_lock);
1080 rt->dst.next = icmp6_dst_gc_list;
1081 icmp6_dst_gc_list = &rt->dst;
1082 spin_unlock_bh(&icmp6_dst_lock);
1083
1084 fib6_force_start_gc(net);
1085
1086 out:
1087 return &rt->dst;
1088 }
1089
1090 int icmp6_dst_gc(void)
1091 {
1092 struct dst_entry *dst, **pprev;
1093 int more = 0;
1094
1095 spin_lock_bh(&icmp6_dst_lock);
1096 pprev = &icmp6_dst_gc_list;
1097
1098 while ((dst = *pprev) != NULL) {
1099 if (!atomic_read(&dst->__refcnt)) {
1100 *pprev = dst->next;
1101 dst_free(dst);
1102 } else {
1103 pprev = &dst->next;
1104 ++more;
1105 }
1106 }
1107
1108 spin_unlock_bh(&icmp6_dst_lock);
1109
1110 return more;
1111 }
1112
1113 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1114 void *arg)
1115 {
1116 struct dst_entry *dst, **pprev;
1117
1118 spin_lock_bh(&icmp6_dst_lock);
1119 pprev = &icmp6_dst_gc_list;
1120 while ((dst = *pprev) != NULL) {
1121 struct rt6_info *rt = (struct rt6_info *) dst;
1122 if (func(rt, arg)) {
1123 *pprev = dst->next;
1124 dst_free(dst);
1125 } else {
1126 pprev = &dst->next;
1127 }
1128 }
1129 spin_unlock_bh(&icmp6_dst_lock);
1130 }
1131
1132 static int ip6_dst_gc(struct dst_ops *ops)
1133 {
1134 unsigned long now = jiffies;
1135 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1136 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1137 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1138 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1139 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1140 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1141 int entries;
1142
1143 entries = dst_entries_get_fast(ops);
1144 if (time_after(rt_last_gc + rt_min_interval, now) &&
1145 entries <= rt_max_size)
1146 goto out;
1147
1148 net->ipv6.ip6_rt_gc_expire++;
1149 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net);
1150 net->ipv6.ip6_rt_last_gc = now;
1151 entries = dst_entries_get_slow(ops);
1152 if (entries < ops->gc_thresh)
1153 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1154 out:
1155 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1156 return entries > rt_max_size;
1157 }
1158
1159 /* Clean host part of a prefix. Not necessary in radix tree,
1160 but results in cleaner routing tables.
1161
1162 Remove it only when all the things will work!
1163 */
1164
1165 int ip6_dst_hoplimit(struct dst_entry *dst)
1166 {
1167 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
1168 if (hoplimit == 0) {
1169 struct net_device *dev = dst->dev;
1170 struct inet6_dev *idev;
1171
1172 rcu_read_lock();
1173 idev = __in6_dev_get(dev);
1174 if (idev)
1175 hoplimit = idev->cnf.hop_limit;
1176 else
1177 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
1178 rcu_read_unlock();
1179 }
1180 return hoplimit;
1181 }
1182 EXPORT_SYMBOL(ip6_dst_hoplimit);
1183
1184 /*
1185 *
1186 */
1187
1188 int ip6_route_add(struct fib6_config *cfg)
1189 {
1190 int err;
1191 struct net *net = cfg->fc_nlinfo.nl_net;
1192 struct rt6_info *rt = NULL;
1193 struct net_device *dev = NULL;
1194 struct inet6_dev *idev = NULL;
1195 struct fib6_table *table;
1196 int addr_type;
1197
1198 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1199 return -EINVAL;
1200 #ifndef CONFIG_IPV6_SUBTREES
1201 if (cfg->fc_src_len)
1202 return -EINVAL;
1203 #endif
1204 if (cfg->fc_ifindex) {
1205 err = -ENODEV;
1206 dev = dev_get_by_index(net, cfg->fc_ifindex);
1207 if (!dev)
1208 goto out;
1209 idev = in6_dev_get(dev);
1210 if (!idev)
1211 goto out;
1212 }
1213
1214 if (cfg->fc_metric == 0)
1215 cfg->fc_metric = IP6_RT_PRIO_USER;
1216
1217 table = fib6_new_table(net, cfg->fc_table);
1218 if (table == NULL) {
1219 err = -ENOBUFS;
1220 goto out;
1221 }
1222
1223 rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL, DST_NOCOUNT);
1224
1225 if (rt == NULL) {
1226 err = -ENOMEM;
1227 goto out;
1228 }
1229
1230 rt->dst.obsolete = -1;
1231 rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ?
1232 jiffies + clock_t_to_jiffies(cfg->fc_expires) :
1233 0;
1234
1235 if (cfg->fc_protocol == RTPROT_UNSPEC)
1236 cfg->fc_protocol = RTPROT_BOOT;
1237 rt->rt6i_protocol = cfg->fc_protocol;
1238
1239 addr_type = ipv6_addr_type(&cfg->fc_dst);
1240
1241 if (addr_type & IPV6_ADDR_MULTICAST)
1242 rt->dst.input = ip6_mc_input;
1243 else if (cfg->fc_flags & RTF_LOCAL)
1244 rt->dst.input = ip6_input;
1245 else
1246 rt->dst.input = ip6_forward;
1247
1248 rt->dst.output = ip6_output;
1249
1250 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1251 rt->rt6i_dst.plen = cfg->fc_dst_len;
1252 if (rt->rt6i_dst.plen == 128)
1253 rt->dst.flags |= DST_HOST;
1254
1255 #ifdef CONFIG_IPV6_SUBTREES
1256 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1257 rt->rt6i_src.plen = cfg->fc_src_len;
1258 #endif
1259
1260 rt->rt6i_metric = cfg->fc_metric;
1261
1262 /* We cannot add true routes via loopback here,
1263 they would result in kernel looping; promote them to reject routes
1264 */
1265 if ((cfg->fc_flags & RTF_REJECT) ||
1266 (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK)
1267 && !(cfg->fc_flags&RTF_LOCAL))) {
1268 /* hold loopback dev/idev if we haven't done so. */
1269 if (dev != net->loopback_dev) {
1270 if (dev) {
1271 dev_put(dev);
1272 in6_dev_put(idev);
1273 }
1274 dev = net->loopback_dev;
1275 dev_hold(dev);
1276 idev = in6_dev_get(dev);
1277 if (!idev) {
1278 err = -ENODEV;
1279 goto out;
1280 }
1281 }
1282 rt->dst.output = ip6_pkt_discard_out;
1283 rt->dst.input = ip6_pkt_discard;
1284 rt->dst.error = -ENETUNREACH;
1285 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1286 goto install_route;
1287 }
1288
1289 if (cfg->fc_flags & RTF_GATEWAY) {
1290 const struct in6_addr *gw_addr;
1291 int gwa_type;
1292
1293 gw_addr = &cfg->fc_gateway;
1294 ipv6_addr_copy(&rt->rt6i_gateway, gw_addr);
1295 gwa_type = ipv6_addr_type(gw_addr);
1296
1297 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1298 struct rt6_info *grt;
1299
1300 /* IPv6 strictly inhibits using not link-local
1301 addresses as nexthop address.
1302 Otherwise, router will not able to send redirects.
1303 It is very good, but in some (rare!) circumstances
1304 (SIT, PtP, NBMA NOARP links) it is handy to allow
1305 some exceptions. --ANK
1306 */
1307 err = -EINVAL;
1308 if (!(gwa_type&IPV6_ADDR_UNICAST))
1309 goto out;
1310
1311 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1312
1313 err = -EHOSTUNREACH;
1314 if (grt == NULL)
1315 goto out;
1316 if (dev) {
1317 if (dev != grt->rt6i_dev) {
1318 dst_release(&grt->dst);
1319 goto out;
1320 }
1321 } else {
1322 dev = grt->rt6i_dev;
1323 idev = grt->rt6i_idev;
1324 dev_hold(dev);
1325 in6_dev_hold(grt->rt6i_idev);
1326 }
1327 if (!(grt->rt6i_flags&RTF_GATEWAY))
1328 err = 0;
1329 dst_release(&grt->dst);
1330
1331 if (err)
1332 goto out;
1333 }
1334 err = -EINVAL;
1335 if (dev == NULL || (dev->flags&IFF_LOOPBACK))
1336 goto out;
1337 }
1338
1339 err = -ENODEV;
1340 if (dev == NULL)
1341 goto out;
1342
1343 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1344 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1345 err = -EINVAL;
1346 goto out;
1347 }
1348 ipv6_addr_copy(&rt->rt6i_prefsrc.addr, &cfg->fc_prefsrc);
1349 rt->rt6i_prefsrc.plen = 128;
1350 } else
1351 rt->rt6i_prefsrc.plen = 0;
1352
1353 if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
1354 struct neighbour *n = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
1355 if (IS_ERR(n)) {
1356 err = PTR_ERR(n);
1357 goto out;
1358 }
1359 dst_set_neighbour(&rt->dst, n);
1360 }
1361
1362 rt->rt6i_flags = cfg->fc_flags;
1363
1364 install_route:
1365 if (cfg->fc_mx) {
1366 struct nlattr *nla;
1367 int remaining;
1368
1369 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1370 int type = nla_type(nla);
1371
1372 if (type) {
1373 if (type > RTAX_MAX) {
1374 err = -EINVAL;
1375 goto out;
1376 }
1377
1378 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1379 }
1380 }
1381 }
1382
1383 rt->dst.dev = dev;
1384 rt->rt6i_idev = idev;
1385 rt->rt6i_table = table;
1386
1387 cfg->fc_nlinfo.nl_net = dev_net(dev);
1388
1389 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1390
1391 out:
1392 if (dev)
1393 dev_put(dev);
1394 if (idev)
1395 in6_dev_put(idev);
1396 if (rt)
1397 dst_free(&rt->dst);
1398 return err;
1399 }
1400
1401 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1402 {
1403 int err;
1404 struct fib6_table *table;
1405 struct net *net = dev_net(rt->rt6i_dev);
1406
1407 if (rt == net->ipv6.ip6_null_entry)
1408 return -ENOENT;
1409
1410 table = rt->rt6i_table;
1411 write_lock_bh(&table->tb6_lock);
1412
1413 err = fib6_del(rt, info);
1414 dst_release(&rt->dst);
1415
1416 write_unlock_bh(&table->tb6_lock);
1417
1418 return err;
1419 }
1420
1421 int ip6_del_rt(struct rt6_info *rt)
1422 {
1423 struct nl_info info = {
1424 .nl_net = dev_net(rt->rt6i_dev),
1425 };
1426 return __ip6_del_rt(rt, &info);
1427 }
1428
1429 static int ip6_route_del(struct fib6_config *cfg)
1430 {
1431 struct fib6_table *table;
1432 struct fib6_node *fn;
1433 struct rt6_info *rt;
1434 int err = -ESRCH;
1435
1436 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1437 if (table == NULL)
1438 return err;
1439
1440 read_lock_bh(&table->tb6_lock);
1441
1442 fn = fib6_locate(&table->tb6_root,
1443 &cfg->fc_dst, cfg->fc_dst_len,
1444 &cfg->fc_src, cfg->fc_src_len);
1445
1446 if (fn) {
1447 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1448 if (cfg->fc_ifindex &&
1449 (rt->rt6i_dev == NULL ||
1450 rt->rt6i_dev->ifindex != cfg->fc_ifindex))
1451 continue;
1452 if (cfg->fc_flags & RTF_GATEWAY &&
1453 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1454 continue;
1455 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1456 continue;
1457 dst_hold(&rt->dst);
1458 read_unlock_bh(&table->tb6_lock);
1459
1460 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1461 }
1462 }
1463 read_unlock_bh(&table->tb6_lock);
1464
1465 return err;
1466 }
1467
1468 /*
1469 * Handle redirects
1470 */
1471 struct ip6rd_flowi {
1472 struct flowi6 fl6;
1473 struct in6_addr gateway;
1474 };
1475
1476 static struct rt6_info *__ip6_route_redirect(struct net *net,
1477 struct fib6_table *table,
1478 struct flowi6 *fl6,
1479 int flags)
1480 {
1481 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1482 struct rt6_info *rt;
1483 struct fib6_node *fn;
1484
1485 /*
1486 * Get the "current" route for this destination and
1487 * check if the redirect has come from approriate router.
1488 *
1489 * RFC 2461 specifies that redirects should only be
1490 * accepted if they come from the nexthop to the target.
1491 * Due to the way the routes are chosen, this notion
1492 * is a bit fuzzy and one might need to check all possible
1493 * routes.
1494 */
1495
1496 read_lock_bh(&table->tb6_lock);
1497 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1498 restart:
1499 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1500 /*
1501 * Current route is on-link; redirect is always invalid.
1502 *
1503 * Seems, previous statement is not true. It could
1504 * be node, which looks for us as on-link (f.e. proxy ndisc)
1505 * But then router serving it might decide, that we should
1506 * know truth 8)8) --ANK (980726).
1507 */
1508 if (rt6_check_expired(rt))
1509 continue;
1510 if (!(rt->rt6i_flags & RTF_GATEWAY))
1511 continue;
1512 if (fl6->flowi6_oif != rt->rt6i_dev->ifindex)
1513 continue;
1514 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1515 continue;
1516 break;
1517 }
1518
1519 if (!rt)
1520 rt = net->ipv6.ip6_null_entry;
1521 BACKTRACK(net, &fl6->saddr);
1522 out:
1523 dst_hold(&rt->dst);
1524
1525 read_unlock_bh(&table->tb6_lock);
1526
1527 return rt;
1528 };
1529
1530 static struct rt6_info *ip6_route_redirect(const struct in6_addr *dest,
1531 const struct in6_addr *src,
1532 const struct in6_addr *gateway,
1533 struct net_device *dev)
1534 {
1535 int flags = RT6_LOOKUP_F_HAS_SADDR;
1536 struct net *net = dev_net(dev);
1537 struct ip6rd_flowi rdfl = {
1538 .fl6 = {
1539 .flowi6_oif = dev->ifindex,
1540 .daddr = *dest,
1541 .saddr = *src,
1542 },
1543 };
1544
1545 ipv6_addr_copy(&rdfl.gateway, gateway);
1546
1547 if (rt6_need_strict(dest))
1548 flags |= RT6_LOOKUP_F_IFACE;
1549
1550 return (struct rt6_info *)fib6_rule_lookup(net, &rdfl.fl6,
1551 flags, __ip6_route_redirect);
1552 }
1553
1554 void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src,
1555 const struct in6_addr *saddr,
1556 struct neighbour *neigh, u8 *lladdr, int on_link)
1557 {
1558 struct rt6_info *rt, *nrt = NULL;
1559 struct netevent_redirect netevent;
1560 struct net *net = dev_net(neigh->dev);
1561
1562 rt = ip6_route_redirect(dest, src, saddr, neigh->dev);
1563
1564 if (rt == net->ipv6.ip6_null_entry) {
1565 if (net_ratelimit())
1566 printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
1567 "for redirect target\n");
1568 goto out;
1569 }
1570
1571 /*
1572 * We have finally decided to accept it.
1573 */
1574
1575 neigh_update(neigh, lladdr, NUD_STALE,
1576 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1577 NEIGH_UPDATE_F_OVERRIDE|
1578 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1579 NEIGH_UPDATE_F_ISROUTER))
1580 );
1581
1582 /*
1583 * Redirect received -> path was valid.
1584 * Look, redirects are sent only in response to data packets,
1585 * so that this nexthop apparently is reachable. --ANK
1586 */
1587 dst_confirm(&rt->dst);
1588
1589 /* Duplicate redirect: silently ignore. */
1590 if (neigh == dst_get_neighbour(&rt->dst))
1591 goto out;
1592
1593 nrt = ip6_rt_copy(rt, dest);
1594 if (nrt == NULL)
1595 goto out;
1596
1597 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1598 if (on_link)
1599 nrt->rt6i_flags &= ~RTF_GATEWAY;
1600
1601 nrt->rt6i_dst.plen = 128;
1602 nrt->dst.flags |= DST_HOST;
1603
1604 ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
1605 dst_set_neighbour(&nrt->dst, neigh_clone(neigh));
1606
1607 if (ip6_ins_rt(nrt))
1608 goto out;
1609
1610 netevent.old = &rt->dst;
1611 netevent.new = &nrt->dst;
1612 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1613
1614 if (rt->rt6i_flags&RTF_CACHE) {
1615 ip6_del_rt(rt);
1616 return;
1617 }
1618
1619 out:
1620 dst_release(&rt->dst);
1621 }
1622
1623 /*
1624 * Handle ICMP "packet too big" messages
1625 * i.e. Path MTU discovery
1626 */
1627
1628 static void rt6_do_pmtu_disc(const struct in6_addr *daddr, const struct in6_addr *saddr,
1629 struct net *net, u32 pmtu, int ifindex)
1630 {
1631 struct rt6_info *rt, *nrt;
1632 int allfrag = 0;
1633 again:
1634 rt = rt6_lookup(net, daddr, saddr, ifindex, 0);
1635 if (rt == NULL)
1636 return;
1637
1638 if (rt6_check_expired(rt)) {
1639 ip6_del_rt(rt);
1640 goto again;
1641 }
1642
1643 if (pmtu >= dst_mtu(&rt->dst))
1644 goto out;
1645
1646 if (pmtu < IPV6_MIN_MTU) {
1647 /*
1648 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
1649 * MTU (1280) and a fragment header should always be included
1650 * after a node receiving Too Big message reporting PMTU is
1651 * less than the IPv6 Minimum Link MTU.
1652 */
1653 pmtu = IPV6_MIN_MTU;
1654 allfrag = 1;
1655 }
1656
1657 /* New mtu received -> path was valid.
1658 They are sent only in response to data packets,
1659 so that this nexthop apparently is reachable. --ANK
1660 */
1661 dst_confirm(&rt->dst);
1662
1663 /* Host route. If it is static, it would be better
1664 not to override it, but add new one, so that
1665 when cache entry will expire old pmtu
1666 would return automatically.
1667 */
1668 if (rt->rt6i_flags & RTF_CACHE) {
1669 dst_metric_set(&rt->dst, RTAX_MTU, pmtu);
1670 if (allfrag) {
1671 u32 features = dst_metric(&rt->dst, RTAX_FEATURES);
1672 features |= RTAX_FEATURE_ALLFRAG;
1673 dst_metric_set(&rt->dst, RTAX_FEATURES, features);
1674 }
1675 dst_set_expires(&rt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires);
1676 rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
1677 goto out;
1678 }
1679
1680 /* Network route.
1681 Two cases are possible:
1682 1. It is connected route. Action: COW
1683 2. It is gatewayed route or NONEXTHOP route. Action: clone it.
1684 */
1685 if (!dst_get_neighbour(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP))
1686 nrt = rt6_alloc_cow(rt, daddr, saddr);
1687 else
1688 nrt = rt6_alloc_clone(rt, daddr);
1689
1690 if (nrt) {
1691 dst_metric_set(&nrt->dst, RTAX_MTU, pmtu);
1692 if (allfrag) {
1693 u32 features = dst_metric(&nrt->dst, RTAX_FEATURES);
1694 features |= RTAX_FEATURE_ALLFRAG;
1695 dst_metric_set(&nrt->dst, RTAX_FEATURES, features);
1696 }
1697
1698 /* According to RFC 1981, detecting PMTU increase shouldn't be
1699 * happened within 5 mins, the recommended timer is 10 mins.
1700 * Here this route expiration time is set to ip6_rt_mtu_expires
1701 * which is 10 mins. After 10 mins the decreased pmtu is expired
1702 * and detecting PMTU increase will be automatically happened.
1703 */
1704 dst_set_expires(&nrt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires);
1705 nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
1706
1707 ip6_ins_rt(nrt);
1708 }
1709 out:
1710 dst_release(&rt->dst);
1711 }
1712
1713 void rt6_pmtu_discovery(const struct in6_addr *daddr, const struct in6_addr *saddr,
1714 struct net_device *dev, u32 pmtu)
1715 {
1716 struct net *net = dev_net(dev);
1717
1718 /*
1719 * RFC 1981 states that a node "MUST reduce the size of the packets it
1720 * is sending along the path" that caused the Packet Too Big message.
1721 * Since it's not possible in the general case to determine which
1722 * interface was used to send the original packet, we update the MTU
1723 * on the interface that will be used to send future packets. We also
1724 * update the MTU on the interface that received the Packet Too Big in
1725 * case the original packet was forced out that interface with
1726 * SO_BINDTODEVICE or similar. This is the next best thing to the
1727 * correct behaviour, which would be to update the MTU on all
1728 * interfaces.
1729 */
1730 rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0);
1731 rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex);
1732 }
1733
1734 /*
1735 * Misc support functions
1736 */
1737
1738 static struct rt6_info *ip6_rt_copy(const struct rt6_info *ort,
1739 const struct in6_addr *dest)
1740 {
1741 struct net *net = dev_net(ort->rt6i_dev);
1742 struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops,
1743 ort->dst.dev, 0);
1744
1745 if (rt) {
1746 rt->dst.input = ort->dst.input;
1747 rt->dst.output = ort->dst.output;
1748
1749 ipv6_addr_copy(&rt->rt6i_dst.addr, dest);
1750 rt->rt6i_dst.plen = ort->rt6i_dst.plen;
1751 dst_copy_metrics(&rt->dst, &ort->dst);
1752 rt->dst.error = ort->dst.error;
1753 rt->rt6i_idev = ort->rt6i_idev;
1754 if (rt->rt6i_idev)
1755 in6_dev_hold(rt->rt6i_idev);
1756 rt->dst.lastuse = jiffies;
1757 rt->rt6i_expires = 0;
1758
1759 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
1760 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
1761 rt->rt6i_metric = 0;
1762
1763 #ifdef CONFIG_IPV6_SUBTREES
1764 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1765 #endif
1766 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1767 rt->rt6i_table = ort->rt6i_table;
1768 }
1769 return rt;
1770 }
1771
1772 #ifdef CONFIG_IPV6_ROUTE_INFO
1773 static struct rt6_info *rt6_get_route_info(struct net *net,
1774 const struct in6_addr *prefix, int prefixlen,
1775 const struct in6_addr *gwaddr, int ifindex)
1776 {
1777 struct fib6_node *fn;
1778 struct rt6_info *rt = NULL;
1779 struct fib6_table *table;
1780
1781 table = fib6_get_table(net, RT6_TABLE_INFO);
1782 if (table == NULL)
1783 return NULL;
1784
1785 write_lock_bh(&table->tb6_lock);
1786 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1787 if (!fn)
1788 goto out;
1789
1790 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1791 if (rt->rt6i_dev->ifindex != ifindex)
1792 continue;
1793 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1794 continue;
1795 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1796 continue;
1797 dst_hold(&rt->dst);
1798 break;
1799 }
1800 out:
1801 write_unlock_bh(&table->tb6_lock);
1802 return rt;
1803 }
1804
1805 static struct rt6_info *rt6_add_route_info(struct net *net,
1806 const struct in6_addr *prefix, int prefixlen,
1807 const struct in6_addr *gwaddr, int ifindex,
1808 unsigned pref)
1809 {
1810 struct fib6_config cfg = {
1811 .fc_table = RT6_TABLE_INFO,
1812 .fc_metric = IP6_RT_PRIO_USER,
1813 .fc_ifindex = ifindex,
1814 .fc_dst_len = prefixlen,
1815 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1816 RTF_UP | RTF_PREF(pref),
1817 .fc_nlinfo.pid = 0,
1818 .fc_nlinfo.nlh = NULL,
1819 .fc_nlinfo.nl_net = net,
1820 };
1821
1822 ipv6_addr_copy(&cfg.fc_dst, prefix);
1823 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1824
1825 /* We should treat it as a default route if prefix length is 0. */
1826 if (!prefixlen)
1827 cfg.fc_flags |= RTF_DEFAULT;
1828
1829 ip6_route_add(&cfg);
1830
1831 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1832 }
1833 #endif
1834
1835 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1836 {
1837 struct rt6_info *rt;
1838 struct fib6_table *table;
1839
1840 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1841 if (table == NULL)
1842 return NULL;
1843
1844 write_lock_bh(&table->tb6_lock);
1845 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1846 if (dev == rt->rt6i_dev &&
1847 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1848 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1849 break;
1850 }
1851 if (rt)
1852 dst_hold(&rt->dst);
1853 write_unlock_bh(&table->tb6_lock);
1854 return rt;
1855 }
1856
1857 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1858 struct net_device *dev,
1859 unsigned int pref)
1860 {
1861 struct fib6_config cfg = {
1862 .fc_table = RT6_TABLE_DFLT,
1863 .fc_metric = IP6_RT_PRIO_USER,
1864 .fc_ifindex = dev->ifindex,
1865 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1866 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1867 .fc_nlinfo.pid = 0,
1868 .fc_nlinfo.nlh = NULL,
1869 .fc_nlinfo.nl_net = dev_net(dev),
1870 };
1871
1872 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1873
1874 ip6_route_add(&cfg);
1875
1876 return rt6_get_dflt_router(gwaddr, dev);
1877 }
1878
1879 void rt6_purge_dflt_routers(struct net *net)
1880 {
1881 struct rt6_info *rt;
1882 struct fib6_table *table;
1883
1884 /* NOTE: Keep consistent with rt6_get_dflt_router */
1885 table = fib6_get_table(net, RT6_TABLE_DFLT);
1886 if (table == NULL)
1887 return;
1888
1889 restart:
1890 read_lock_bh(&table->tb6_lock);
1891 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
1892 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
1893 dst_hold(&rt->dst);
1894 read_unlock_bh(&table->tb6_lock);
1895 ip6_del_rt(rt);
1896 goto restart;
1897 }
1898 }
1899 read_unlock_bh(&table->tb6_lock);
1900 }
1901
1902 static void rtmsg_to_fib6_config(struct net *net,
1903 struct in6_rtmsg *rtmsg,
1904 struct fib6_config *cfg)
1905 {
1906 memset(cfg, 0, sizeof(*cfg));
1907
1908 cfg->fc_table = RT6_TABLE_MAIN;
1909 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1910 cfg->fc_metric = rtmsg->rtmsg_metric;
1911 cfg->fc_expires = rtmsg->rtmsg_info;
1912 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1913 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1914 cfg->fc_flags = rtmsg->rtmsg_flags;
1915
1916 cfg->fc_nlinfo.nl_net = net;
1917
1918 ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst);
1919 ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src);
1920 ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway);
1921 }
1922
1923 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1924 {
1925 struct fib6_config cfg;
1926 struct in6_rtmsg rtmsg;
1927 int err;
1928
1929 switch(cmd) {
1930 case SIOCADDRT: /* Add a route */
1931 case SIOCDELRT: /* Delete a route */
1932 if (!capable(CAP_NET_ADMIN))
1933 return -EPERM;
1934 err = copy_from_user(&rtmsg, arg,
1935 sizeof(struct in6_rtmsg));
1936 if (err)
1937 return -EFAULT;
1938
1939 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
1940
1941 rtnl_lock();
1942 switch (cmd) {
1943 case SIOCADDRT:
1944 err = ip6_route_add(&cfg);
1945 break;
1946 case SIOCDELRT:
1947 err = ip6_route_del(&cfg);
1948 break;
1949 default:
1950 err = -EINVAL;
1951 }
1952 rtnl_unlock();
1953
1954 return err;
1955 }
1956
1957 return -EINVAL;
1958 }
1959
1960 /*
1961 * Drop the packet on the floor
1962 */
1963
1964 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1965 {
1966 int type;
1967 struct dst_entry *dst = skb_dst(skb);
1968 switch (ipstats_mib_noroutes) {
1969 case IPSTATS_MIB_INNOROUTES:
1970 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
1971 if (type == IPV6_ADDR_ANY) {
1972 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
1973 IPSTATS_MIB_INADDRERRORS);
1974 break;
1975 }
1976 /* FALLTHROUGH */
1977 case IPSTATS_MIB_OUTNOROUTES:
1978 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
1979 ipstats_mib_noroutes);
1980 break;
1981 }
1982 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1983 kfree_skb(skb);
1984 return 0;
1985 }
1986
1987 static int ip6_pkt_discard(struct sk_buff *skb)
1988 {
1989 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
1990 }
1991
1992 static int ip6_pkt_discard_out(struct sk_buff *skb)
1993 {
1994 skb->dev = skb_dst(skb)->dev;
1995 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1996 }
1997
1998 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
1999
2000 static int ip6_pkt_prohibit(struct sk_buff *skb)
2001 {
2002 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2003 }
2004
2005 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2006 {
2007 skb->dev = skb_dst(skb)->dev;
2008 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2009 }
2010
2011 #endif
2012
2013 /*
2014 * Allocate a dst for local (unicast / anycast) address.
2015 */
2016
2017 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2018 const struct in6_addr *addr,
2019 int anycast)
2020 {
2021 struct net *net = dev_net(idev->dev);
2022 struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops,
2023 net->loopback_dev, 0);
2024 struct neighbour *neigh;
2025
2026 if (rt == NULL) {
2027 if (net_ratelimit())
2028 pr_warning("IPv6: Maximum number of routes reached,"
2029 " consider increasing route/max_size.\n");
2030 return ERR_PTR(-ENOMEM);
2031 }
2032
2033 in6_dev_hold(idev);
2034
2035 rt->dst.flags |= DST_HOST;
2036 rt->dst.input = ip6_input;
2037 rt->dst.output = ip6_output;
2038 rt->rt6i_idev = idev;
2039 rt->dst.obsolete = -1;
2040
2041 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2042 if (anycast)
2043 rt->rt6i_flags |= RTF_ANYCAST;
2044 else
2045 rt->rt6i_flags |= RTF_LOCAL;
2046 neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
2047 if (IS_ERR(neigh)) {
2048 dst_free(&rt->dst);
2049
2050 return ERR_CAST(neigh);
2051 }
2052 dst_set_neighbour(&rt->dst, neigh);
2053
2054 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
2055 rt->rt6i_dst.plen = 128;
2056 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2057
2058 atomic_set(&rt->dst.__refcnt, 1);
2059
2060 return rt;
2061 }
2062
2063 int ip6_route_get_saddr(struct net *net,
2064 struct rt6_info *rt,
2065 const struct in6_addr *daddr,
2066 unsigned int prefs,
2067 struct in6_addr *saddr)
2068 {
2069 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2070 int err = 0;
2071 if (rt->rt6i_prefsrc.plen)
2072 ipv6_addr_copy(saddr, &rt->rt6i_prefsrc.addr);
2073 else
2074 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2075 daddr, prefs, saddr);
2076 return err;
2077 }
2078
2079 /* remove deleted ip from prefsrc entries */
2080 struct arg_dev_net_ip {
2081 struct net_device *dev;
2082 struct net *net;
2083 struct in6_addr *addr;
2084 };
2085
2086 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2087 {
2088 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2089 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2090 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2091
2092 if (((void *)rt->rt6i_dev == dev || dev == NULL) &&
2093 rt != net->ipv6.ip6_null_entry &&
2094 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2095 /* remove prefsrc entry */
2096 rt->rt6i_prefsrc.plen = 0;
2097 }
2098 return 0;
2099 }
2100
2101 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2102 {
2103 struct net *net = dev_net(ifp->idev->dev);
2104 struct arg_dev_net_ip adni = {
2105 .dev = ifp->idev->dev,
2106 .net = net,
2107 .addr = &ifp->addr,
2108 };
2109 fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2110 }
2111
2112 struct arg_dev_net {
2113 struct net_device *dev;
2114 struct net *net;
2115 };
2116
2117 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2118 {
2119 const struct arg_dev_net *adn = arg;
2120 const struct net_device *dev = adn->dev;
2121
2122 if ((rt->rt6i_dev == dev || dev == NULL) &&
2123 rt != adn->net->ipv6.ip6_null_entry) {
2124 RT6_TRACE("deleted by ifdown %p\n", rt);
2125 return -1;
2126 }
2127 return 0;
2128 }
2129
2130 void rt6_ifdown(struct net *net, struct net_device *dev)
2131 {
2132 struct arg_dev_net adn = {
2133 .dev = dev,
2134 .net = net,
2135 };
2136
2137 fib6_clean_all(net, fib6_ifdown, 0, &adn);
2138 icmp6_clean_all(fib6_ifdown, &adn);
2139 }
2140
2141 struct rt6_mtu_change_arg
2142 {
2143 struct net_device *dev;
2144 unsigned mtu;
2145 };
2146
2147 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2148 {
2149 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2150 struct inet6_dev *idev;
2151
2152 /* In IPv6 pmtu discovery is not optional,
2153 so that RTAX_MTU lock cannot disable it.
2154 We still use this lock to block changes
2155 caused by addrconf/ndisc.
2156 */
2157
2158 idev = __in6_dev_get(arg->dev);
2159 if (idev == NULL)
2160 return 0;
2161
2162 /* For administrative MTU increase, there is no way to discover
2163 IPv6 PMTU increase, so PMTU increase should be updated here.
2164 Since RFC 1981 doesn't include administrative MTU increase
2165 update PMTU increase is a MUST. (i.e. jumbo frame)
2166 */
2167 /*
2168 If new MTU is less than route PMTU, this new MTU will be the
2169 lowest MTU in the path, update the route PMTU to reflect PMTU
2170 decreases; if new MTU is greater than route PMTU, and the
2171 old MTU is the lowest MTU in the path, update the route PMTU
2172 to reflect the increase. In this case if the other nodes' MTU
2173 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2174 PMTU discouvery.
2175 */
2176 if (rt->rt6i_dev == arg->dev &&
2177 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2178 (dst_mtu(&rt->dst) >= arg->mtu ||
2179 (dst_mtu(&rt->dst) < arg->mtu &&
2180 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2181 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2182 }
2183 return 0;
2184 }
2185
2186 void rt6_mtu_change(struct net_device *dev, unsigned mtu)
2187 {
2188 struct rt6_mtu_change_arg arg = {
2189 .dev = dev,
2190 .mtu = mtu,
2191 };
2192
2193 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2194 }
2195
2196 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2197 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2198 [RTA_OIF] = { .type = NLA_U32 },
2199 [RTA_IIF] = { .type = NLA_U32 },
2200 [RTA_PRIORITY] = { .type = NLA_U32 },
2201 [RTA_METRICS] = { .type = NLA_NESTED },
2202 };
2203
2204 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2205 struct fib6_config *cfg)
2206 {
2207 struct rtmsg *rtm;
2208 struct nlattr *tb[RTA_MAX+1];
2209 int err;
2210
2211 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2212 if (err < 0)
2213 goto errout;
2214
2215 err = -EINVAL;
2216 rtm = nlmsg_data(nlh);
2217 memset(cfg, 0, sizeof(*cfg));
2218
2219 cfg->fc_table = rtm->rtm_table;
2220 cfg->fc_dst_len = rtm->rtm_dst_len;
2221 cfg->fc_src_len = rtm->rtm_src_len;
2222 cfg->fc_flags = RTF_UP;
2223 cfg->fc_protocol = rtm->rtm_protocol;
2224
2225 if (rtm->rtm_type == RTN_UNREACHABLE)
2226 cfg->fc_flags |= RTF_REJECT;
2227
2228 if (rtm->rtm_type == RTN_LOCAL)
2229 cfg->fc_flags |= RTF_LOCAL;
2230
2231 cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
2232 cfg->fc_nlinfo.nlh = nlh;
2233 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2234
2235 if (tb[RTA_GATEWAY]) {
2236 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2237 cfg->fc_flags |= RTF_GATEWAY;
2238 }
2239
2240 if (tb[RTA_DST]) {
2241 int plen = (rtm->rtm_dst_len + 7) >> 3;
2242
2243 if (nla_len(tb[RTA_DST]) < plen)
2244 goto errout;
2245
2246 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2247 }
2248
2249 if (tb[RTA_SRC]) {
2250 int plen = (rtm->rtm_src_len + 7) >> 3;
2251
2252 if (nla_len(tb[RTA_SRC]) < plen)
2253 goto errout;
2254
2255 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2256 }
2257
2258 if (tb[RTA_PREFSRC])
2259 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2260
2261 if (tb[RTA_OIF])
2262 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2263
2264 if (tb[RTA_PRIORITY])
2265 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2266
2267 if (tb[RTA_METRICS]) {
2268 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2269 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2270 }
2271
2272 if (tb[RTA_TABLE])
2273 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2274
2275 err = 0;
2276 errout:
2277 return err;
2278 }
2279
2280 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2281 {
2282 struct fib6_config cfg;
2283 int err;
2284
2285 err = rtm_to_fib6_config(skb, nlh, &cfg);
2286 if (err < 0)
2287 return err;
2288
2289 return ip6_route_del(&cfg);
2290 }
2291
2292 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2293 {
2294 struct fib6_config cfg;
2295 int err;
2296
2297 err = rtm_to_fib6_config(skb, nlh, &cfg);
2298 if (err < 0)
2299 return err;
2300
2301 return ip6_route_add(&cfg);
2302 }
2303
2304 static inline size_t rt6_nlmsg_size(void)
2305 {
2306 return NLMSG_ALIGN(sizeof(struct rtmsg))
2307 + nla_total_size(16) /* RTA_SRC */
2308 + nla_total_size(16) /* RTA_DST */
2309 + nla_total_size(16) /* RTA_GATEWAY */
2310 + nla_total_size(16) /* RTA_PREFSRC */
2311 + nla_total_size(4) /* RTA_TABLE */
2312 + nla_total_size(4) /* RTA_IIF */
2313 + nla_total_size(4) /* RTA_OIF */
2314 + nla_total_size(4) /* RTA_PRIORITY */
2315 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2316 + nla_total_size(sizeof(struct rta_cacheinfo));
2317 }
2318
2319 static int rt6_fill_node(struct net *net,
2320 struct sk_buff *skb, struct rt6_info *rt,
2321 struct in6_addr *dst, struct in6_addr *src,
2322 int iif, int type, u32 pid, u32 seq,
2323 int prefix, int nowait, unsigned int flags)
2324 {
2325 struct rtmsg *rtm;
2326 struct nlmsghdr *nlh;
2327 long expires;
2328 u32 table;
2329
2330 if (prefix) { /* user wants prefix routes only */
2331 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2332 /* success since this is not a prefix route */
2333 return 1;
2334 }
2335 }
2336
2337 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
2338 if (nlh == NULL)
2339 return -EMSGSIZE;
2340
2341 rtm = nlmsg_data(nlh);
2342 rtm->rtm_family = AF_INET6;
2343 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2344 rtm->rtm_src_len = rt->rt6i_src.plen;
2345 rtm->rtm_tos = 0;
2346 if (rt->rt6i_table)
2347 table = rt->rt6i_table->tb6_id;
2348 else
2349 table = RT6_TABLE_UNSPEC;
2350 rtm->rtm_table = table;
2351 NLA_PUT_U32(skb, RTA_TABLE, table);
2352 if (rt->rt6i_flags&RTF_REJECT)
2353 rtm->rtm_type = RTN_UNREACHABLE;
2354 else if (rt->rt6i_flags&RTF_LOCAL)
2355 rtm->rtm_type = RTN_LOCAL;
2356 else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
2357 rtm->rtm_type = RTN_LOCAL;
2358 else
2359 rtm->rtm_type = RTN_UNICAST;
2360 rtm->rtm_flags = 0;
2361 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2362 rtm->rtm_protocol = rt->rt6i_protocol;
2363 if (rt->rt6i_flags&RTF_DYNAMIC)
2364 rtm->rtm_protocol = RTPROT_REDIRECT;
2365 else if (rt->rt6i_flags & RTF_ADDRCONF)
2366 rtm->rtm_protocol = RTPROT_KERNEL;
2367 else if (rt->rt6i_flags&RTF_DEFAULT)
2368 rtm->rtm_protocol = RTPROT_RA;
2369
2370 if (rt->rt6i_flags&RTF_CACHE)
2371 rtm->rtm_flags |= RTM_F_CLONED;
2372
2373 if (dst) {
2374 NLA_PUT(skb, RTA_DST, 16, dst);
2375 rtm->rtm_dst_len = 128;
2376 } else if (rtm->rtm_dst_len)
2377 NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
2378 #ifdef CONFIG_IPV6_SUBTREES
2379 if (src) {
2380 NLA_PUT(skb, RTA_SRC, 16, src);
2381 rtm->rtm_src_len = 128;
2382 } else if (rtm->rtm_src_len)
2383 NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
2384 #endif
2385 if (iif) {
2386 #ifdef CONFIG_IPV6_MROUTE
2387 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2388 int err = ip6mr_get_route(net, skb, rtm, nowait);
2389 if (err <= 0) {
2390 if (!nowait) {
2391 if (err == 0)
2392 return 0;
2393 goto nla_put_failure;
2394 } else {
2395 if (err == -EMSGSIZE)
2396 goto nla_put_failure;
2397 }
2398 }
2399 } else
2400 #endif
2401 NLA_PUT_U32(skb, RTA_IIF, iif);
2402 } else if (dst) {
2403 struct in6_addr saddr_buf;
2404 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0)
2405 NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
2406 }
2407
2408 if (rt->rt6i_prefsrc.plen) {
2409 struct in6_addr saddr_buf;
2410 ipv6_addr_copy(&saddr_buf, &rt->rt6i_prefsrc.addr);
2411 NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
2412 }
2413
2414 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2415 goto nla_put_failure;
2416
2417 if (dst_get_neighbour(&rt->dst))
2418 NLA_PUT(skb, RTA_GATEWAY, 16, &dst_get_neighbour(&rt->dst)->primary_key);
2419
2420 if (rt->dst.dev)
2421 NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex);
2422
2423 NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric);
2424
2425 if (!(rt->rt6i_flags & RTF_EXPIRES))
2426 expires = 0;
2427 else if (rt->rt6i_expires - jiffies < INT_MAX)
2428 expires = rt->rt6i_expires - jiffies;
2429 else
2430 expires = INT_MAX;
2431
2432 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0,
2433 expires, rt->dst.error) < 0)
2434 goto nla_put_failure;
2435
2436 return nlmsg_end(skb, nlh);
2437
2438 nla_put_failure:
2439 nlmsg_cancel(skb, nlh);
2440 return -EMSGSIZE;
2441 }
2442
2443 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2444 {
2445 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2446 int prefix;
2447
2448 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2449 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2450 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2451 } else
2452 prefix = 0;
2453
2454 return rt6_fill_node(arg->net,
2455 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2456 NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
2457 prefix, 0, NLM_F_MULTI);
2458 }
2459
2460 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
2461 {
2462 struct net *net = sock_net(in_skb->sk);
2463 struct nlattr *tb[RTA_MAX+1];
2464 struct rt6_info *rt;
2465 struct sk_buff *skb;
2466 struct rtmsg *rtm;
2467 struct flowi6 fl6;
2468 int err, iif = 0;
2469
2470 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2471 if (err < 0)
2472 goto errout;
2473
2474 err = -EINVAL;
2475 memset(&fl6, 0, sizeof(fl6));
2476
2477 if (tb[RTA_SRC]) {
2478 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2479 goto errout;
2480
2481 ipv6_addr_copy(&fl6.saddr, nla_data(tb[RTA_SRC]));
2482 }
2483
2484 if (tb[RTA_DST]) {
2485 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2486 goto errout;
2487
2488 ipv6_addr_copy(&fl6.daddr, nla_data(tb[RTA_DST]));
2489 }
2490
2491 if (tb[RTA_IIF])
2492 iif = nla_get_u32(tb[RTA_IIF]);
2493
2494 if (tb[RTA_OIF])
2495 fl6.flowi6_oif = nla_get_u32(tb[RTA_OIF]);
2496
2497 if (iif) {
2498 struct net_device *dev;
2499 dev = __dev_get_by_index(net, iif);
2500 if (!dev) {
2501 err = -ENODEV;
2502 goto errout;
2503 }
2504 }
2505
2506 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2507 if (skb == NULL) {
2508 err = -ENOBUFS;
2509 goto errout;
2510 }
2511
2512 /* Reserve room for dummy headers, this skb can pass
2513 through good chunk of routing engine.
2514 */
2515 skb_reset_mac_header(skb);
2516 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2517
2518 rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl6);
2519 skb_dst_set(skb, &rt->dst);
2520
2521 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2522 RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2523 nlh->nlmsg_seq, 0, 0, 0);
2524 if (err < 0) {
2525 kfree_skb(skb);
2526 goto errout;
2527 }
2528
2529 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
2530 errout:
2531 return err;
2532 }
2533
2534 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2535 {
2536 struct sk_buff *skb;
2537 struct net *net = info->nl_net;
2538 u32 seq;
2539 int err;
2540
2541 err = -ENOBUFS;
2542 seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0;
2543
2544 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2545 if (skb == NULL)
2546 goto errout;
2547
2548 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2549 event, info->pid, seq, 0, 0, 0);
2550 if (err < 0) {
2551 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2552 WARN_ON(err == -EMSGSIZE);
2553 kfree_skb(skb);
2554 goto errout;
2555 }
2556 rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE,
2557 info->nlh, gfp_any());
2558 return;
2559 errout:
2560 if (err < 0)
2561 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2562 }
2563
2564 static int ip6_route_dev_notify(struct notifier_block *this,
2565 unsigned long event, void *data)
2566 {
2567 struct net_device *dev = (struct net_device *)data;
2568 struct net *net = dev_net(dev);
2569
2570 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2571 net->ipv6.ip6_null_entry->dst.dev = dev;
2572 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2573 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2574 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2575 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2576 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2577 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2578 #endif
2579 }
2580
2581 return NOTIFY_OK;
2582 }
2583
2584 /*
2585 * /proc
2586 */
2587
2588 #ifdef CONFIG_PROC_FS
2589
2590 struct rt6_proc_arg
2591 {
2592 char *buffer;
2593 int offset;
2594 int length;
2595 int skip;
2596 int len;
2597 };
2598
2599 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2600 {
2601 struct seq_file *m = p_arg;
2602 struct neighbour *n;
2603
2604 seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
2605
2606 #ifdef CONFIG_IPV6_SUBTREES
2607 seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
2608 #else
2609 seq_puts(m, "00000000000000000000000000000000 00 ");
2610 #endif
2611 n = dst_get_neighbour(&rt->dst);
2612 if (n) {
2613 seq_printf(m, "%pi6", n->primary_key);
2614 } else {
2615 seq_puts(m, "00000000000000000000000000000000");
2616 }
2617 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2618 rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
2619 rt->dst.__use, rt->rt6i_flags,
2620 rt->rt6i_dev ? rt->rt6i_dev->name : "");
2621 return 0;
2622 }
2623
2624 static int ipv6_route_show(struct seq_file *m, void *v)
2625 {
2626 struct net *net = (struct net *)m->private;
2627 fib6_clean_all(net, rt6_info_route, 0, m);
2628 return 0;
2629 }
2630
2631 static int ipv6_route_open(struct inode *inode, struct file *file)
2632 {
2633 return single_open_net(inode, file, ipv6_route_show);
2634 }
2635
2636 static const struct file_operations ipv6_route_proc_fops = {
2637 .owner = THIS_MODULE,
2638 .open = ipv6_route_open,
2639 .read = seq_read,
2640 .llseek = seq_lseek,
2641 .release = single_release_net,
2642 };
2643
2644 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2645 {
2646 struct net *net = (struct net *)seq->private;
2647 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2648 net->ipv6.rt6_stats->fib_nodes,
2649 net->ipv6.rt6_stats->fib_route_nodes,
2650 net->ipv6.rt6_stats->fib_rt_alloc,
2651 net->ipv6.rt6_stats->fib_rt_entries,
2652 net->ipv6.rt6_stats->fib_rt_cache,
2653 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2654 net->ipv6.rt6_stats->fib_discarded_routes);
2655
2656 return 0;
2657 }
2658
2659 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2660 {
2661 return single_open_net(inode, file, rt6_stats_seq_show);
2662 }
2663
2664 static const struct file_operations rt6_stats_seq_fops = {
2665 .owner = THIS_MODULE,
2666 .open = rt6_stats_seq_open,
2667 .read = seq_read,
2668 .llseek = seq_lseek,
2669 .release = single_release_net,
2670 };
2671 #endif /* CONFIG_PROC_FS */
2672
2673 #ifdef CONFIG_SYSCTL
2674
2675 static
2676 int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write,
2677 void __user *buffer, size_t *lenp, loff_t *ppos)
2678 {
2679 struct net *net;
2680 int delay;
2681 if (!write)
2682 return -EINVAL;
2683
2684 net = (struct net *)ctl->extra1;
2685 delay = net->ipv6.sysctl.flush_delay;
2686 proc_dointvec(ctl, write, buffer, lenp, ppos);
2687 fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
2688 return 0;
2689 }
2690
2691 ctl_table ipv6_route_table_template[] = {
2692 {
2693 .procname = "flush",
2694 .data = &init_net.ipv6.sysctl.flush_delay,
2695 .maxlen = sizeof(int),
2696 .mode = 0200,
2697 .proc_handler = ipv6_sysctl_rtcache_flush
2698 },
2699 {
2700 .procname = "gc_thresh",
2701 .data = &ip6_dst_ops_template.gc_thresh,
2702 .maxlen = sizeof(int),
2703 .mode = 0644,
2704 .proc_handler = proc_dointvec,
2705 },
2706 {
2707 .procname = "max_size",
2708 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2709 .maxlen = sizeof(int),
2710 .mode = 0644,
2711 .proc_handler = proc_dointvec,
2712 },
2713 {
2714 .procname = "gc_min_interval",
2715 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2716 .maxlen = sizeof(int),
2717 .mode = 0644,
2718 .proc_handler = proc_dointvec_jiffies,
2719 },
2720 {
2721 .procname = "gc_timeout",
2722 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2723 .maxlen = sizeof(int),
2724 .mode = 0644,
2725 .proc_handler = proc_dointvec_jiffies,
2726 },
2727 {
2728 .procname = "gc_interval",
2729 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2730 .maxlen = sizeof(int),
2731 .mode = 0644,
2732 .proc_handler = proc_dointvec_jiffies,
2733 },
2734 {
2735 .procname = "gc_elasticity",
2736 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2737 .maxlen = sizeof(int),
2738 .mode = 0644,
2739 .proc_handler = proc_dointvec,
2740 },
2741 {
2742 .procname = "mtu_expires",
2743 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2744 .maxlen = sizeof(int),
2745 .mode = 0644,
2746 .proc_handler = proc_dointvec_jiffies,
2747 },
2748 {
2749 .procname = "min_adv_mss",
2750 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2751 .maxlen = sizeof(int),
2752 .mode = 0644,
2753 .proc_handler = proc_dointvec,
2754 },
2755 {
2756 .procname = "gc_min_interval_ms",
2757 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2758 .maxlen = sizeof(int),
2759 .mode = 0644,
2760 .proc_handler = proc_dointvec_ms_jiffies,
2761 },
2762 { }
2763 };
2764
2765 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2766 {
2767 struct ctl_table *table;
2768
2769 table = kmemdup(ipv6_route_table_template,
2770 sizeof(ipv6_route_table_template),
2771 GFP_KERNEL);
2772
2773 if (table) {
2774 table[0].data = &net->ipv6.sysctl.flush_delay;
2775 table[0].extra1 = net;
2776 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2777 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2778 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2779 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2780 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2781 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2782 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2783 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2784 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2785 }
2786
2787 return table;
2788 }
2789 #endif
2790
2791 static int __net_init ip6_route_net_init(struct net *net)
2792 {
2793 int ret = -ENOMEM;
2794
2795 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2796 sizeof(net->ipv6.ip6_dst_ops));
2797
2798 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2799 goto out_ip6_dst_ops;
2800
2801 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2802 sizeof(*net->ipv6.ip6_null_entry),
2803 GFP_KERNEL);
2804 if (!net->ipv6.ip6_null_entry)
2805 goto out_ip6_dst_entries;
2806 net->ipv6.ip6_null_entry->dst.path =
2807 (struct dst_entry *)net->ipv6.ip6_null_entry;
2808 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2809 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
2810 ip6_template_metrics, true);
2811
2812 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2813 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2814 sizeof(*net->ipv6.ip6_prohibit_entry),
2815 GFP_KERNEL);
2816 if (!net->ipv6.ip6_prohibit_entry)
2817 goto out_ip6_null_entry;
2818 net->ipv6.ip6_prohibit_entry->dst.path =
2819 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
2820 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2821 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
2822 ip6_template_metrics, true);
2823
2824 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
2825 sizeof(*net->ipv6.ip6_blk_hole_entry),
2826 GFP_KERNEL);
2827 if (!net->ipv6.ip6_blk_hole_entry)
2828 goto out_ip6_prohibit_entry;
2829 net->ipv6.ip6_blk_hole_entry->dst.path =
2830 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
2831 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2832 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
2833 ip6_template_metrics, true);
2834 #endif
2835
2836 net->ipv6.sysctl.flush_delay = 0;
2837 net->ipv6.sysctl.ip6_rt_max_size = 4096;
2838 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
2839 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
2840 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
2841 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
2842 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
2843 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
2844
2845 #ifdef CONFIG_PROC_FS
2846 proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
2847 proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
2848 #endif
2849 net->ipv6.ip6_rt_gc_expire = 30*HZ;
2850
2851 ret = 0;
2852 out:
2853 return ret;
2854
2855 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2856 out_ip6_prohibit_entry:
2857 kfree(net->ipv6.ip6_prohibit_entry);
2858 out_ip6_null_entry:
2859 kfree(net->ipv6.ip6_null_entry);
2860 #endif
2861 out_ip6_dst_entries:
2862 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
2863 out_ip6_dst_ops:
2864 goto out;
2865 }
2866
2867 static void __net_exit ip6_route_net_exit(struct net *net)
2868 {
2869 #ifdef CONFIG_PROC_FS
2870 proc_net_remove(net, "ipv6_route");
2871 proc_net_remove(net, "rt6_stats");
2872 #endif
2873 kfree(net->ipv6.ip6_null_entry);
2874 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2875 kfree(net->ipv6.ip6_prohibit_entry);
2876 kfree(net->ipv6.ip6_blk_hole_entry);
2877 #endif
2878 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
2879 }
2880
2881 static struct pernet_operations ip6_route_net_ops = {
2882 .init = ip6_route_net_init,
2883 .exit = ip6_route_net_exit,
2884 };
2885
2886 static struct notifier_block ip6_route_dev_notifier = {
2887 .notifier_call = ip6_route_dev_notify,
2888 .priority = 0,
2889 };
2890
2891 int __init ip6_route_init(void)
2892 {
2893 int ret;
2894
2895 ret = -ENOMEM;
2896 ip6_dst_ops_template.kmem_cachep =
2897 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
2898 SLAB_HWCACHE_ALIGN, NULL);
2899 if (!ip6_dst_ops_template.kmem_cachep)
2900 goto out;
2901
2902 ret = dst_entries_init(&ip6_dst_blackhole_ops);
2903 if (ret)
2904 goto out_kmem_cache;
2905
2906 ret = register_pernet_subsys(&ip6_route_net_ops);
2907 if (ret)
2908 goto out_dst_entries;
2909
2910 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
2911
2912 /* Registering of the loopback is done before this portion of code,
2913 * the loopback reference in rt6_info will not be taken, do it
2914 * manually for init_net */
2915 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
2916 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
2917 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2918 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
2919 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
2920 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
2921 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
2922 #endif
2923 ret = fib6_init();
2924 if (ret)
2925 goto out_register_subsys;
2926
2927 ret = xfrm6_init();
2928 if (ret)
2929 goto out_fib6_init;
2930
2931 ret = fib6_rules_init();
2932 if (ret)
2933 goto xfrm6_init;
2934
2935 ret = -ENOBUFS;
2936 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
2937 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
2938 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
2939 goto fib6_rules_init;
2940
2941 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
2942 if (ret)
2943 goto fib6_rules_init;
2944
2945 out:
2946 return ret;
2947
2948 fib6_rules_init:
2949 fib6_rules_cleanup();
2950 xfrm6_init:
2951 xfrm6_fini();
2952 out_fib6_init:
2953 fib6_gc_cleanup();
2954 out_register_subsys:
2955 unregister_pernet_subsys(&ip6_route_net_ops);
2956 out_dst_entries:
2957 dst_entries_destroy(&ip6_dst_blackhole_ops);
2958 out_kmem_cache:
2959 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
2960 goto out;
2961 }
2962
2963 void ip6_route_cleanup(void)
2964 {
2965 unregister_netdevice_notifier(&ip6_route_dev_notifier);
2966 fib6_rules_cleanup();
2967 xfrm6_fini();
2968 fib6_gc_cleanup();
2969 unregister_pernet_subsys(&ip6_route_net_ops);
2970 dst_entries_destroy(&ip6_dst_blackhole_ops);
2971 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
2972 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree