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ipv6: initialize ip6_route sysctl vars in ip6_route_net_init()
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / route.c
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 <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 struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
77 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
78 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
79 static void ip6_dst_destroy(struct dst_entry *);
80 static void ip6_dst_ifdown(struct dst_entry *,
81 struct net_device *dev, int how);
82 static int ip6_dst_gc(struct dst_ops *ops);
83
84 static int ip6_pkt_discard(struct sk_buff *skb);
85 static int ip6_pkt_discard_out(struct sk_buff *skb);
86 static void ip6_link_failure(struct sk_buff *skb);
87 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
88
89 #ifdef CONFIG_IPV6_ROUTE_INFO
90 static struct rt6_info *rt6_add_route_info(struct net *net,
91 struct in6_addr *prefix, int prefixlen,
92 struct in6_addr *gwaddr, int ifindex,
93 unsigned pref);
94 static struct rt6_info *rt6_get_route_info(struct net *net,
95 struct in6_addr *prefix, int prefixlen,
96 struct in6_addr *gwaddr, int ifindex);
97 #endif
98
99 static struct dst_ops ip6_dst_ops_template = {
100 .family = AF_INET6,
101 .protocol = __constant_htons(ETH_P_IPV6),
102 .gc = ip6_dst_gc,
103 .gc_thresh = 1024,
104 .check = ip6_dst_check,
105 .destroy = ip6_dst_destroy,
106 .ifdown = ip6_dst_ifdown,
107 .negative_advice = ip6_negative_advice,
108 .link_failure = ip6_link_failure,
109 .update_pmtu = ip6_rt_update_pmtu,
110 .local_out = __ip6_local_out,
111 .entry_size = sizeof(struct rt6_info),
112 .entries = ATOMIC_INIT(0),
113 };
114
115 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
116 {
117 }
118
119 static struct dst_ops ip6_dst_blackhole_ops = {
120 .family = AF_INET6,
121 .protocol = __constant_htons(ETH_P_IPV6),
122 .destroy = ip6_dst_destroy,
123 .check = ip6_dst_check,
124 .update_pmtu = ip6_rt_blackhole_update_pmtu,
125 .entry_size = sizeof(struct rt6_info),
126 .entries = ATOMIC_INIT(0),
127 };
128
129 static struct rt6_info ip6_null_entry_template = {
130 .u = {
131 .dst = {
132 .__refcnt = ATOMIC_INIT(1),
133 .__use = 1,
134 .obsolete = -1,
135 .error = -ENETUNREACH,
136 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
137 .input = ip6_pkt_discard,
138 .output = ip6_pkt_discard_out,
139 }
140 },
141 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
142 .rt6i_metric = ~(u32) 0,
143 .rt6i_ref = ATOMIC_INIT(1),
144 };
145
146 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
147
148 static int ip6_pkt_prohibit(struct sk_buff *skb);
149 static int ip6_pkt_prohibit_out(struct sk_buff *skb);
150
151 static struct rt6_info ip6_prohibit_entry_template = {
152 .u = {
153 .dst = {
154 .__refcnt = ATOMIC_INIT(1),
155 .__use = 1,
156 .obsolete = -1,
157 .error = -EACCES,
158 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
159 .input = ip6_pkt_prohibit,
160 .output = ip6_pkt_prohibit_out,
161 }
162 },
163 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
164 .rt6i_metric = ~(u32) 0,
165 .rt6i_ref = ATOMIC_INIT(1),
166 };
167
168 static struct rt6_info ip6_blk_hole_entry_template = {
169 .u = {
170 .dst = {
171 .__refcnt = ATOMIC_INIT(1),
172 .__use = 1,
173 .obsolete = -1,
174 .error = -EINVAL,
175 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
176 .input = dst_discard,
177 .output = dst_discard,
178 }
179 },
180 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
181 .rt6i_metric = ~(u32) 0,
182 .rt6i_ref = ATOMIC_INIT(1),
183 };
184
185 #endif
186
187 /* allocate dst with ip6_dst_ops */
188 static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops)
189 {
190 return (struct rt6_info *)dst_alloc(ops);
191 }
192
193 static void ip6_dst_destroy(struct dst_entry *dst)
194 {
195 struct rt6_info *rt = (struct rt6_info *)dst;
196 struct inet6_dev *idev = rt->rt6i_idev;
197
198 if (idev != NULL) {
199 rt->rt6i_idev = NULL;
200 in6_dev_put(idev);
201 }
202 }
203
204 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
205 int how)
206 {
207 struct rt6_info *rt = (struct rt6_info *)dst;
208 struct inet6_dev *idev = rt->rt6i_idev;
209 struct net_device *loopback_dev =
210 dev_net(dev)->loopback_dev;
211
212 if (dev != loopback_dev && idev != NULL && idev->dev == dev) {
213 struct inet6_dev *loopback_idev =
214 in6_dev_get(loopback_dev);
215 if (loopback_idev != NULL) {
216 rt->rt6i_idev = loopback_idev;
217 in6_dev_put(idev);
218 }
219 }
220 }
221
222 static __inline__ int rt6_check_expired(const struct rt6_info *rt)
223 {
224 return (rt->rt6i_flags & RTF_EXPIRES &&
225 time_after(jiffies, rt->rt6i_expires));
226 }
227
228 static inline int rt6_need_strict(struct in6_addr *daddr)
229 {
230 return (ipv6_addr_type(daddr) &
231 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK));
232 }
233
234 /*
235 * Route lookup. Any table->tb6_lock is implied.
236 */
237
238 static inline struct rt6_info *rt6_device_match(struct net *net,
239 struct rt6_info *rt,
240 struct in6_addr *saddr,
241 int oif,
242 int flags)
243 {
244 struct rt6_info *local = NULL;
245 struct rt6_info *sprt;
246
247 if (!oif && ipv6_addr_any(saddr))
248 goto out;
249
250 for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) {
251 struct net_device *dev = sprt->rt6i_dev;
252
253 if (oif) {
254 if (dev->ifindex == oif)
255 return sprt;
256 if (dev->flags & IFF_LOOPBACK) {
257 if (sprt->rt6i_idev == NULL ||
258 sprt->rt6i_idev->dev->ifindex != oif) {
259 if (flags & RT6_LOOKUP_F_IFACE && oif)
260 continue;
261 if (local && (!oif ||
262 local->rt6i_idev->dev->ifindex == oif))
263 continue;
264 }
265 local = sprt;
266 }
267 } else {
268 if (ipv6_chk_addr(net, saddr, dev,
269 flags & RT6_LOOKUP_F_IFACE))
270 return sprt;
271 }
272 }
273
274 if (oif) {
275 if (local)
276 return local;
277
278 if (flags & RT6_LOOKUP_F_IFACE)
279 return net->ipv6.ip6_null_entry;
280 }
281 out:
282 return rt;
283 }
284
285 #ifdef CONFIG_IPV6_ROUTER_PREF
286 static void rt6_probe(struct rt6_info *rt)
287 {
288 struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL;
289 /*
290 * Okay, this does not seem to be appropriate
291 * for now, however, we need to check if it
292 * is really so; aka Router Reachability Probing.
293 *
294 * Router Reachability Probe MUST be rate-limited
295 * to no more than one per minute.
296 */
297 if (!neigh || (neigh->nud_state & NUD_VALID))
298 return;
299 read_lock_bh(&neigh->lock);
300 if (!(neigh->nud_state & NUD_VALID) &&
301 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
302 struct in6_addr mcaddr;
303 struct in6_addr *target;
304
305 neigh->updated = jiffies;
306 read_unlock_bh(&neigh->lock);
307
308 target = (struct in6_addr *)&neigh->primary_key;
309 addrconf_addr_solict_mult(target, &mcaddr);
310 ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL);
311 } else
312 read_unlock_bh(&neigh->lock);
313 }
314 #else
315 static inline void rt6_probe(struct rt6_info *rt)
316 {
317 return;
318 }
319 #endif
320
321 /*
322 * Default Router Selection (RFC 2461 6.3.6)
323 */
324 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
325 {
326 struct net_device *dev = rt->rt6i_dev;
327 if (!oif || dev->ifindex == oif)
328 return 2;
329 if ((dev->flags & IFF_LOOPBACK) &&
330 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
331 return 1;
332 return 0;
333 }
334
335 static inline int rt6_check_neigh(struct rt6_info *rt)
336 {
337 struct neighbour *neigh = rt->rt6i_nexthop;
338 int m;
339 if (rt->rt6i_flags & RTF_NONEXTHOP ||
340 !(rt->rt6i_flags & RTF_GATEWAY))
341 m = 1;
342 else if (neigh) {
343 read_lock_bh(&neigh->lock);
344 if (neigh->nud_state & NUD_VALID)
345 m = 2;
346 #ifdef CONFIG_IPV6_ROUTER_PREF
347 else if (neigh->nud_state & NUD_FAILED)
348 m = 0;
349 #endif
350 else
351 m = 1;
352 read_unlock_bh(&neigh->lock);
353 } else
354 m = 0;
355 return m;
356 }
357
358 static int rt6_score_route(struct rt6_info *rt, int oif,
359 int strict)
360 {
361 int m, n;
362
363 m = rt6_check_dev(rt, oif);
364 if (!m && (strict & RT6_LOOKUP_F_IFACE))
365 return -1;
366 #ifdef CONFIG_IPV6_ROUTER_PREF
367 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
368 #endif
369 n = rt6_check_neigh(rt);
370 if (!n && (strict & RT6_LOOKUP_F_REACHABLE))
371 return -1;
372 return m;
373 }
374
375 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
376 int *mpri, struct rt6_info *match)
377 {
378 int m;
379
380 if (rt6_check_expired(rt))
381 goto out;
382
383 m = rt6_score_route(rt, oif, strict);
384 if (m < 0)
385 goto out;
386
387 if (m > *mpri) {
388 if (strict & RT6_LOOKUP_F_REACHABLE)
389 rt6_probe(match);
390 *mpri = m;
391 match = rt;
392 } else if (strict & RT6_LOOKUP_F_REACHABLE) {
393 rt6_probe(rt);
394 }
395
396 out:
397 return match;
398 }
399
400 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
401 struct rt6_info *rr_head,
402 u32 metric, int oif, int strict)
403 {
404 struct rt6_info *rt, *match;
405 int mpri = -1;
406
407 match = NULL;
408 for (rt = rr_head; rt && rt->rt6i_metric == metric;
409 rt = rt->u.dst.rt6_next)
410 match = find_match(rt, oif, strict, &mpri, match);
411 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
412 rt = rt->u.dst.rt6_next)
413 match = find_match(rt, oif, strict, &mpri, match);
414
415 return match;
416 }
417
418 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
419 {
420 struct rt6_info *match, *rt0;
421 struct net *net;
422
423 RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n",
424 __func__, fn->leaf, oif);
425
426 rt0 = fn->rr_ptr;
427 if (!rt0)
428 fn->rr_ptr = rt0 = fn->leaf;
429
430 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict);
431
432 if (!match &&
433 (strict & RT6_LOOKUP_F_REACHABLE)) {
434 struct rt6_info *next = rt0->u.dst.rt6_next;
435
436 /* no entries matched; do round-robin */
437 if (!next || next->rt6i_metric != rt0->rt6i_metric)
438 next = fn->leaf;
439
440 if (next != rt0)
441 fn->rr_ptr = next;
442 }
443
444 RT6_TRACE("%s() => %p\n",
445 __func__, match);
446
447 net = dev_net(rt0->rt6i_dev);
448 return (match ? match : net->ipv6.ip6_null_entry);
449 }
450
451 #ifdef CONFIG_IPV6_ROUTE_INFO
452 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
453 struct in6_addr *gwaddr)
454 {
455 struct net *net = dev_net(dev);
456 struct route_info *rinfo = (struct route_info *) opt;
457 struct in6_addr prefix_buf, *prefix;
458 unsigned int pref;
459 unsigned long lifetime;
460 struct rt6_info *rt;
461
462 if (len < sizeof(struct route_info)) {
463 return -EINVAL;
464 }
465
466 /* Sanity check for prefix_len and length */
467 if (rinfo->length > 3) {
468 return -EINVAL;
469 } else if (rinfo->prefix_len > 128) {
470 return -EINVAL;
471 } else if (rinfo->prefix_len > 64) {
472 if (rinfo->length < 2) {
473 return -EINVAL;
474 }
475 } else if (rinfo->prefix_len > 0) {
476 if (rinfo->length < 1) {
477 return -EINVAL;
478 }
479 }
480
481 pref = rinfo->route_pref;
482 if (pref == ICMPV6_ROUTER_PREF_INVALID)
483 pref = ICMPV6_ROUTER_PREF_MEDIUM;
484
485 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
486
487 if (rinfo->length == 3)
488 prefix = (struct in6_addr *)rinfo->prefix;
489 else {
490 /* this function is safe */
491 ipv6_addr_prefix(&prefix_buf,
492 (struct in6_addr *)rinfo->prefix,
493 rinfo->prefix_len);
494 prefix = &prefix_buf;
495 }
496
497 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
498 dev->ifindex);
499
500 if (rt && !lifetime) {
501 ip6_del_rt(rt);
502 rt = NULL;
503 }
504
505 if (!rt && lifetime)
506 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
507 pref);
508 else if (rt)
509 rt->rt6i_flags = RTF_ROUTEINFO |
510 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
511
512 if (rt) {
513 if (!addrconf_finite_timeout(lifetime)) {
514 rt->rt6i_flags &= ~RTF_EXPIRES;
515 } else {
516 rt->rt6i_expires = jiffies + HZ * lifetime;
517 rt->rt6i_flags |= RTF_EXPIRES;
518 }
519 dst_release(&rt->u.dst);
520 }
521 return 0;
522 }
523 #endif
524
525 #define BACKTRACK(__net, saddr) \
526 do { \
527 if (rt == __net->ipv6.ip6_null_entry) { \
528 struct fib6_node *pn; \
529 while (1) { \
530 if (fn->fn_flags & RTN_TL_ROOT) \
531 goto out; \
532 pn = fn->parent; \
533 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
534 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
535 else \
536 fn = pn; \
537 if (fn->fn_flags & RTN_RTINFO) \
538 goto restart; \
539 } \
540 } \
541 } while(0)
542
543 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
544 struct fib6_table *table,
545 struct flowi *fl, int flags)
546 {
547 struct fib6_node *fn;
548 struct rt6_info *rt;
549
550 read_lock_bh(&table->tb6_lock);
551 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
552 restart:
553 rt = fn->leaf;
554 rt = rt6_device_match(net, rt, &fl->fl6_src, fl->oif, flags);
555 BACKTRACK(net, &fl->fl6_src);
556 out:
557 dst_use(&rt->u.dst, jiffies);
558 read_unlock_bh(&table->tb6_lock);
559 return rt;
560
561 }
562
563 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
564 const struct in6_addr *saddr, int oif, int strict)
565 {
566 struct flowi fl = {
567 .oif = oif,
568 .nl_u = {
569 .ip6_u = {
570 .daddr = *daddr,
571 },
572 },
573 };
574 struct dst_entry *dst;
575 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
576
577 if (saddr) {
578 memcpy(&fl.fl6_src, saddr, sizeof(*saddr));
579 flags |= RT6_LOOKUP_F_HAS_SADDR;
580 }
581
582 dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup);
583 if (dst->error == 0)
584 return (struct rt6_info *) dst;
585
586 dst_release(dst);
587
588 return NULL;
589 }
590
591 EXPORT_SYMBOL(rt6_lookup);
592
593 /* ip6_ins_rt is called with FREE table->tb6_lock.
594 It takes new route entry, the addition fails by any reason the
595 route is freed. In any case, if caller does not hold it, it may
596 be destroyed.
597 */
598
599 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
600 {
601 int err;
602 struct fib6_table *table;
603
604 table = rt->rt6i_table;
605 write_lock_bh(&table->tb6_lock);
606 err = fib6_add(&table->tb6_root, rt, info);
607 write_unlock_bh(&table->tb6_lock);
608
609 return err;
610 }
611
612 int ip6_ins_rt(struct rt6_info *rt)
613 {
614 struct nl_info info = {
615 .nl_net = dev_net(rt->rt6i_dev),
616 };
617 return __ip6_ins_rt(rt, &info);
618 }
619
620 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
621 struct in6_addr *saddr)
622 {
623 struct rt6_info *rt;
624
625 /*
626 * Clone the route.
627 */
628
629 rt = ip6_rt_copy(ort);
630
631 if (rt) {
632 if (!(rt->rt6i_flags&RTF_GATEWAY)) {
633 if (rt->rt6i_dst.plen != 128 &&
634 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr))
635 rt->rt6i_flags |= RTF_ANYCAST;
636 ipv6_addr_copy(&rt->rt6i_gateway, daddr);
637 }
638
639 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
640 rt->rt6i_dst.plen = 128;
641 rt->rt6i_flags |= RTF_CACHE;
642 rt->u.dst.flags |= DST_HOST;
643
644 #ifdef CONFIG_IPV6_SUBTREES
645 if (rt->rt6i_src.plen && saddr) {
646 ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
647 rt->rt6i_src.plen = 128;
648 }
649 #endif
650
651 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
652
653 }
654
655 return rt;
656 }
657
658 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr)
659 {
660 struct rt6_info *rt = ip6_rt_copy(ort);
661 if (rt) {
662 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
663 rt->rt6i_dst.plen = 128;
664 rt->rt6i_flags |= RTF_CACHE;
665 rt->u.dst.flags |= DST_HOST;
666 rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
667 }
668 return rt;
669 }
670
671 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
672 struct flowi *fl, int flags)
673 {
674 struct fib6_node *fn;
675 struct rt6_info *rt, *nrt;
676 int strict = 0;
677 int attempts = 3;
678 int err;
679 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
680
681 strict |= flags & RT6_LOOKUP_F_IFACE;
682
683 relookup:
684 read_lock_bh(&table->tb6_lock);
685
686 restart_2:
687 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
688
689 restart:
690 rt = rt6_select(fn, oif, strict | reachable);
691
692 BACKTRACK(net, &fl->fl6_src);
693 if (rt == net->ipv6.ip6_null_entry ||
694 rt->rt6i_flags & RTF_CACHE)
695 goto out;
696
697 dst_hold(&rt->u.dst);
698 read_unlock_bh(&table->tb6_lock);
699
700 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
701 nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
702 else {
703 #if CLONE_OFFLINK_ROUTE
704 nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
705 #else
706 goto out2;
707 #endif
708 }
709
710 dst_release(&rt->u.dst);
711 rt = nrt ? : net->ipv6.ip6_null_entry;
712
713 dst_hold(&rt->u.dst);
714 if (nrt) {
715 err = ip6_ins_rt(nrt);
716 if (!err)
717 goto out2;
718 }
719
720 if (--attempts <= 0)
721 goto out2;
722
723 /*
724 * Race condition! In the gap, when table->tb6_lock was
725 * released someone could insert this route. Relookup.
726 */
727 dst_release(&rt->u.dst);
728 goto relookup;
729
730 out:
731 if (reachable) {
732 reachable = 0;
733 goto restart_2;
734 }
735 dst_hold(&rt->u.dst);
736 read_unlock_bh(&table->tb6_lock);
737 out2:
738 rt->u.dst.lastuse = jiffies;
739 rt->u.dst.__use++;
740
741 return rt;
742 }
743
744 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
745 struct flowi *fl, int flags)
746 {
747 return ip6_pol_route(net, table, fl->iif, fl, flags);
748 }
749
750 void ip6_route_input(struct sk_buff *skb)
751 {
752 struct ipv6hdr *iph = ipv6_hdr(skb);
753 struct net *net = dev_net(skb->dev);
754 int flags = RT6_LOOKUP_F_HAS_SADDR;
755 struct flowi fl = {
756 .iif = skb->dev->ifindex,
757 .nl_u = {
758 .ip6_u = {
759 .daddr = iph->daddr,
760 .saddr = iph->saddr,
761 .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK,
762 },
763 },
764 .mark = skb->mark,
765 .proto = iph->nexthdr,
766 };
767
768 if (rt6_need_strict(&iph->daddr))
769 flags |= RT6_LOOKUP_F_IFACE;
770
771 skb->dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input);
772 }
773
774 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
775 struct flowi *fl, int flags)
776 {
777 return ip6_pol_route(net, table, fl->oif, fl, flags);
778 }
779
780 struct dst_entry * ip6_route_output(struct net *net, struct sock *sk,
781 struct flowi *fl)
782 {
783 int flags = 0;
784
785 if (rt6_need_strict(&fl->fl6_dst))
786 flags |= RT6_LOOKUP_F_IFACE;
787
788 if (!ipv6_addr_any(&fl->fl6_src))
789 flags |= RT6_LOOKUP_F_HAS_SADDR;
790 else if (sk) {
791 unsigned int prefs = inet6_sk(sk)->srcprefs;
792 if (prefs & IPV6_PREFER_SRC_TMP)
793 flags |= RT6_LOOKUP_F_SRCPREF_TMP;
794 if (prefs & IPV6_PREFER_SRC_PUBLIC)
795 flags |= RT6_LOOKUP_F_SRCPREF_PUBLIC;
796 if (prefs & IPV6_PREFER_SRC_COA)
797 flags |= RT6_LOOKUP_F_SRCPREF_COA;
798 }
799
800 return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output);
801 }
802
803 EXPORT_SYMBOL(ip6_route_output);
804
805 int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl)
806 {
807 struct rt6_info *ort = (struct rt6_info *) *dstp;
808 struct rt6_info *rt = (struct rt6_info *)
809 dst_alloc(&ip6_dst_blackhole_ops);
810 struct dst_entry *new = NULL;
811
812 if (rt) {
813 new = &rt->u.dst;
814
815 atomic_set(&new->__refcnt, 1);
816 new->__use = 1;
817 new->input = dst_discard;
818 new->output = dst_discard;
819
820 memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
821 new->dev = ort->u.dst.dev;
822 if (new->dev)
823 dev_hold(new->dev);
824 rt->rt6i_idev = ort->rt6i_idev;
825 if (rt->rt6i_idev)
826 in6_dev_hold(rt->rt6i_idev);
827 rt->rt6i_expires = 0;
828
829 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
830 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
831 rt->rt6i_metric = 0;
832
833 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
834 #ifdef CONFIG_IPV6_SUBTREES
835 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
836 #endif
837
838 dst_free(new);
839 }
840
841 dst_release(*dstp);
842 *dstp = new;
843 return (new ? 0 : -ENOMEM);
844 }
845 EXPORT_SYMBOL_GPL(ip6_dst_blackhole);
846
847 /*
848 * Destination cache support functions
849 */
850
851 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
852 {
853 struct rt6_info *rt;
854
855 rt = (struct rt6_info *) dst;
856
857 if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
858 return dst;
859
860 return NULL;
861 }
862
863 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
864 {
865 struct rt6_info *rt = (struct rt6_info *) dst;
866
867 if (rt) {
868 if (rt->rt6i_flags & RTF_CACHE)
869 ip6_del_rt(rt);
870 else
871 dst_release(dst);
872 }
873 return NULL;
874 }
875
876 static void ip6_link_failure(struct sk_buff *skb)
877 {
878 struct rt6_info *rt;
879
880 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
881
882 rt = (struct rt6_info *) skb->dst;
883 if (rt) {
884 if (rt->rt6i_flags&RTF_CACHE) {
885 dst_set_expires(&rt->u.dst, 0);
886 rt->rt6i_flags |= RTF_EXPIRES;
887 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
888 rt->rt6i_node->fn_sernum = -1;
889 }
890 }
891
892 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
893 {
894 struct rt6_info *rt6 = (struct rt6_info*)dst;
895
896 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
897 rt6->rt6i_flags |= RTF_MODIFIED;
898 if (mtu < IPV6_MIN_MTU) {
899 mtu = IPV6_MIN_MTU;
900 dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
901 }
902 dst->metrics[RTAX_MTU-1] = mtu;
903 call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
904 }
905 }
906
907 static int ipv6_get_mtu(struct net_device *dev);
908
909 static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu)
910 {
911 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
912
913 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
914 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
915
916 /*
917 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
918 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
919 * IPV6_MAXPLEN is also valid and means: "any MSS,
920 * rely only on pmtu discovery"
921 */
922 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
923 mtu = IPV6_MAXPLEN;
924 return mtu;
925 }
926
927 static struct dst_entry *icmp6_dst_gc_list;
928 static DEFINE_SPINLOCK(icmp6_dst_lock);
929
930 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
931 struct neighbour *neigh,
932 const struct in6_addr *addr)
933 {
934 struct rt6_info *rt;
935 struct inet6_dev *idev = in6_dev_get(dev);
936 struct net *net = dev_net(dev);
937
938 if (unlikely(idev == NULL))
939 return NULL;
940
941 rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
942 if (unlikely(rt == NULL)) {
943 in6_dev_put(idev);
944 goto out;
945 }
946
947 dev_hold(dev);
948 if (neigh)
949 neigh_hold(neigh);
950 else
951 neigh = ndisc_get_neigh(dev, addr);
952
953 rt->rt6i_dev = dev;
954 rt->rt6i_idev = idev;
955 rt->rt6i_nexthop = neigh;
956 atomic_set(&rt->u.dst.__refcnt, 1);
957 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
958 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
959 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
960 rt->u.dst.output = ip6_output;
961
962 #if 0 /* there's no chance to use these for ndisc */
963 rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
964 ? DST_HOST
965 : 0;
966 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
967 rt->rt6i_dst.plen = 128;
968 #endif
969
970 spin_lock_bh(&icmp6_dst_lock);
971 rt->u.dst.next = icmp6_dst_gc_list;
972 icmp6_dst_gc_list = &rt->u.dst;
973 spin_unlock_bh(&icmp6_dst_lock);
974
975 fib6_force_start_gc(net);
976
977 out:
978 return &rt->u.dst;
979 }
980
981 int icmp6_dst_gc(void)
982 {
983 struct dst_entry *dst, *next, **pprev;
984 int more = 0;
985
986 next = NULL;
987
988 spin_lock_bh(&icmp6_dst_lock);
989 pprev = &icmp6_dst_gc_list;
990
991 while ((dst = *pprev) != NULL) {
992 if (!atomic_read(&dst->__refcnt)) {
993 *pprev = dst->next;
994 dst_free(dst);
995 } else {
996 pprev = &dst->next;
997 ++more;
998 }
999 }
1000
1001 spin_unlock_bh(&icmp6_dst_lock);
1002
1003 return more;
1004 }
1005
1006 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1007 void *arg)
1008 {
1009 struct dst_entry *dst, **pprev;
1010
1011 spin_lock_bh(&icmp6_dst_lock);
1012 pprev = &icmp6_dst_gc_list;
1013 while ((dst = *pprev) != NULL) {
1014 struct rt6_info *rt = (struct rt6_info *) dst;
1015 if (func(rt, arg)) {
1016 *pprev = dst->next;
1017 dst_free(dst);
1018 } else {
1019 pprev = &dst->next;
1020 }
1021 }
1022 spin_unlock_bh(&icmp6_dst_lock);
1023 }
1024
1025 static int ip6_dst_gc(struct dst_ops *ops)
1026 {
1027 unsigned long now = jiffies;
1028 struct net *net = ops->dst_net;
1029 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1030 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1031 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1032 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1033 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1034
1035 if (time_after(rt_last_gc + rt_min_interval, now) &&
1036 atomic_read(&ops->entries) <= rt_max_size)
1037 goto out;
1038
1039 net->ipv6.ip6_rt_gc_expire++;
1040 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net);
1041 net->ipv6.ip6_rt_last_gc = now;
1042 if (atomic_read(&ops->entries) < ops->gc_thresh)
1043 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1044 out:
1045 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1046 return (atomic_read(&ops->entries) > rt_max_size);
1047 }
1048
1049 /* Clean host part of a prefix. Not necessary in radix tree,
1050 but results in cleaner routing tables.
1051
1052 Remove it only when all the things will work!
1053 */
1054
1055 static int ipv6_get_mtu(struct net_device *dev)
1056 {
1057 int mtu = IPV6_MIN_MTU;
1058 struct inet6_dev *idev;
1059
1060 idev = in6_dev_get(dev);
1061 if (idev) {
1062 mtu = idev->cnf.mtu6;
1063 in6_dev_put(idev);
1064 }
1065 return mtu;
1066 }
1067
1068 int ip6_dst_hoplimit(struct dst_entry *dst)
1069 {
1070 int hoplimit = dst_metric(dst, RTAX_HOPLIMIT);
1071 if (hoplimit < 0) {
1072 struct net_device *dev = dst->dev;
1073 struct inet6_dev *idev = in6_dev_get(dev);
1074 if (idev) {
1075 hoplimit = idev->cnf.hop_limit;
1076 in6_dev_put(idev);
1077 } else
1078 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
1079 }
1080 return hoplimit;
1081 }
1082
1083 /*
1084 *
1085 */
1086
1087 int ip6_route_add(struct fib6_config *cfg)
1088 {
1089 int err;
1090 struct net *net = cfg->fc_nlinfo.nl_net;
1091 struct rt6_info *rt = NULL;
1092 struct net_device *dev = NULL;
1093 struct inet6_dev *idev = NULL;
1094 struct fib6_table *table;
1095 int addr_type;
1096
1097 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1098 return -EINVAL;
1099 #ifndef CONFIG_IPV6_SUBTREES
1100 if (cfg->fc_src_len)
1101 return -EINVAL;
1102 #endif
1103 if (cfg->fc_ifindex) {
1104 err = -ENODEV;
1105 dev = dev_get_by_index(net, cfg->fc_ifindex);
1106 if (!dev)
1107 goto out;
1108 idev = in6_dev_get(dev);
1109 if (!idev)
1110 goto out;
1111 }
1112
1113 if (cfg->fc_metric == 0)
1114 cfg->fc_metric = IP6_RT_PRIO_USER;
1115
1116 table = fib6_new_table(net, cfg->fc_table);
1117 if (table == NULL) {
1118 err = -ENOBUFS;
1119 goto out;
1120 }
1121
1122 rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
1123
1124 if (rt == NULL) {
1125 err = -ENOMEM;
1126 goto out;
1127 }
1128
1129 rt->u.dst.obsolete = -1;
1130 rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ?
1131 jiffies + clock_t_to_jiffies(cfg->fc_expires) :
1132 0;
1133
1134 if (cfg->fc_protocol == RTPROT_UNSPEC)
1135 cfg->fc_protocol = RTPROT_BOOT;
1136 rt->rt6i_protocol = cfg->fc_protocol;
1137
1138 addr_type = ipv6_addr_type(&cfg->fc_dst);
1139
1140 if (addr_type & IPV6_ADDR_MULTICAST)
1141 rt->u.dst.input = ip6_mc_input;
1142 else
1143 rt->u.dst.input = ip6_forward;
1144
1145 rt->u.dst.output = ip6_output;
1146
1147 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1148 rt->rt6i_dst.plen = cfg->fc_dst_len;
1149 if (rt->rt6i_dst.plen == 128)
1150 rt->u.dst.flags = DST_HOST;
1151
1152 #ifdef CONFIG_IPV6_SUBTREES
1153 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1154 rt->rt6i_src.plen = cfg->fc_src_len;
1155 #endif
1156
1157 rt->rt6i_metric = cfg->fc_metric;
1158
1159 /* We cannot add true routes via loopback here,
1160 they would result in kernel looping; promote them to reject routes
1161 */
1162 if ((cfg->fc_flags & RTF_REJECT) ||
1163 (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
1164 /* hold loopback dev/idev if we haven't done so. */
1165 if (dev != net->loopback_dev) {
1166 if (dev) {
1167 dev_put(dev);
1168 in6_dev_put(idev);
1169 }
1170 dev = net->loopback_dev;
1171 dev_hold(dev);
1172 idev = in6_dev_get(dev);
1173 if (!idev) {
1174 err = -ENODEV;
1175 goto out;
1176 }
1177 }
1178 rt->u.dst.output = ip6_pkt_discard_out;
1179 rt->u.dst.input = ip6_pkt_discard;
1180 rt->u.dst.error = -ENETUNREACH;
1181 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1182 goto install_route;
1183 }
1184
1185 if (cfg->fc_flags & RTF_GATEWAY) {
1186 struct in6_addr *gw_addr;
1187 int gwa_type;
1188
1189 gw_addr = &cfg->fc_gateway;
1190 ipv6_addr_copy(&rt->rt6i_gateway, gw_addr);
1191 gwa_type = ipv6_addr_type(gw_addr);
1192
1193 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1194 struct rt6_info *grt;
1195
1196 /* IPv6 strictly inhibits using not link-local
1197 addresses as nexthop address.
1198 Otherwise, router will not able to send redirects.
1199 It is very good, but in some (rare!) circumstances
1200 (SIT, PtP, NBMA NOARP links) it is handy to allow
1201 some exceptions. --ANK
1202 */
1203 err = -EINVAL;
1204 if (!(gwa_type&IPV6_ADDR_UNICAST))
1205 goto out;
1206
1207 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1208
1209 err = -EHOSTUNREACH;
1210 if (grt == NULL)
1211 goto out;
1212 if (dev) {
1213 if (dev != grt->rt6i_dev) {
1214 dst_release(&grt->u.dst);
1215 goto out;
1216 }
1217 } else {
1218 dev = grt->rt6i_dev;
1219 idev = grt->rt6i_idev;
1220 dev_hold(dev);
1221 in6_dev_hold(grt->rt6i_idev);
1222 }
1223 if (!(grt->rt6i_flags&RTF_GATEWAY))
1224 err = 0;
1225 dst_release(&grt->u.dst);
1226
1227 if (err)
1228 goto out;
1229 }
1230 err = -EINVAL;
1231 if (dev == NULL || (dev->flags&IFF_LOOPBACK))
1232 goto out;
1233 }
1234
1235 err = -ENODEV;
1236 if (dev == NULL)
1237 goto out;
1238
1239 if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
1240 rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
1241 if (IS_ERR(rt->rt6i_nexthop)) {
1242 err = PTR_ERR(rt->rt6i_nexthop);
1243 rt->rt6i_nexthop = NULL;
1244 goto out;
1245 }
1246 }
1247
1248 rt->rt6i_flags = cfg->fc_flags;
1249
1250 install_route:
1251 if (cfg->fc_mx) {
1252 struct nlattr *nla;
1253 int remaining;
1254
1255 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1256 int type = nla_type(nla);
1257
1258 if (type) {
1259 if (type > RTAX_MAX) {
1260 err = -EINVAL;
1261 goto out;
1262 }
1263
1264 rt->u.dst.metrics[type - 1] = nla_get_u32(nla);
1265 }
1266 }
1267 }
1268
1269 if (dst_metric(&rt->u.dst, RTAX_HOPLIMIT) == 0)
1270 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1271 if (!dst_mtu(&rt->u.dst))
1272 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
1273 if (!dst_metric(&rt->u.dst, RTAX_ADVMSS))
1274 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
1275 rt->u.dst.dev = dev;
1276 rt->rt6i_idev = idev;
1277 rt->rt6i_table = table;
1278
1279 cfg->fc_nlinfo.nl_net = dev_net(dev);
1280
1281 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1282
1283 out:
1284 if (dev)
1285 dev_put(dev);
1286 if (idev)
1287 in6_dev_put(idev);
1288 if (rt)
1289 dst_free(&rt->u.dst);
1290 return err;
1291 }
1292
1293 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1294 {
1295 int err;
1296 struct fib6_table *table;
1297 struct net *net = dev_net(rt->rt6i_dev);
1298
1299 if (rt == net->ipv6.ip6_null_entry)
1300 return -ENOENT;
1301
1302 table = rt->rt6i_table;
1303 write_lock_bh(&table->tb6_lock);
1304
1305 err = fib6_del(rt, info);
1306 dst_release(&rt->u.dst);
1307
1308 write_unlock_bh(&table->tb6_lock);
1309
1310 return err;
1311 }
1312
1313 int ip6_del_rt(struct rt6_info *rt)
1314 {
1315 struct nl_info info = {
1316 .nl_net = dev_net(rt->rt6i_dev),
1317 };
1318 return __ip6_del_rt(rt, &info);
1319 }
1320
1321 static int ip6_route_del(struct fib6_config *cfg)
1322 {
1323 struct fib6_table *table;
1324 struct fib6_node *fn;
1325 struct rt6_info *rt;
1326 int err = -ESRCH;
1327
1328 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1329 if (table == NULL)
1330 return err;
1331
1332 read_lock_bh(&table->tb6_lock);
1333
1334 fn = fib6_locate(&table->tb6_root,
1335 &cfg->fc_dst, cfg->fc_dst_len,
1336 &cfg->fc_src, cfg->fc_src_len);
1337
1338 if (fn) {
1339 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1340 if (cfg->fc_ifindex &&
1341 (rt->rt6i_dev == NULL ||
1342 rt->rt6i_dev->ifindex != cfg->fc_ifindex))
1343 continue;
1344 if (cfg->fc_flags & RTF_GATEWAY &&
1345 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1346 continue;
1347 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1348 continue;
1349 dst_hold(&rt->u.dst);
1350 read_unlock_bh(&table->tb6_lock);
1351
1352 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1353 }
1354 }
1355 read_unlock_bh(&table->tb6_lock);
1356
1357 return err;
1358 }
1359
1360 /*
1361 * Handle redirects
1362 */
1363 struct ip6rd_flowi {
1364 struct flowi fl;
1365 struct in6_addr gateway;
1366 };
1367
1368 static struct rt6_info *__ip6_route_redirect(struct net *net,
1369 struct fib6_table *table,
1370 struct flowi *fl,
1371 int flags)
1372 {
1373 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;
1374 struct rt6_info *rt;
1375 struct fib6_node *fn;
1376
1377 /*
1378 * Get the "current" route for this destination and
1379 * check if the redirect has come from approriate router.
1380 *
1381 * RFC 2461 specifies that redirects should only be
1382 * accepted if they come from the nexthop to the target.
1383 * Due to the way the routes are chosen, this notion
1384 * is a bit fuzzy and one might need to check all possible
1385 * routes.
1386 */
1387
1388 read_lock_bh(&table->tb6_lock);
1389 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1390 restart:
1391 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1392 /*
1393 * Current route is on-link; redirect is always invalid.
1394 *
1395 * Seems, previous statement is not true. It could
1396 * be node, which looks for us as on-link (f.e. proxy ndisc)
1397 * But then router serving it might decide, that we should
1398 * know truth 8)8) --ANK (980726).
1399 */
1400 if (rt6_check_expired(rt))
1401 continue;
1402 if (!(rt->rt6i_flags & RTF_GATEWAY))
1403 continue;
1404 if (fl->oif != rt->rt6i_dev->ifindex)
1405 continue;
1406 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1407 continue;
1408 break;
1409 }
1410
1411 if (!rt)
1412 rt = net->ipv6.ip6_null_entry;
1413 BACKTRACK(net, &fl->fl6_src);
1414 out:
1415 dst_hold(&rt->u.dst);
1416
1417 read_unlock_bh(&table->tb6_lock);
1418
1419 return rt;
1420 };
1421
1422 static struct rt6_info *ip6_route_redirect(struct in6_addr *dest,
1423 struct in6_addr *src,
1424 struct in6_addr *gateway,
1425 struct net_device *dev)
1426 {
1427 int flags = RT6_LOOKUP_F_HAS_SADDR;
1428 struct net *net = dev_net(dev);
1429 struct ip6rd_flowi rdfl = {
1430 .fl = {
1431 .oif = dev->ifindex,
1432 .nl_u = {
1433 .ip6_u = {
1434 .daddr = *dest,
1435 .saddr = *src,
1436 },
1437 },
1438 },
1439 .gateway = *gateway,
1440 };
1441
1442 if (rt6_need_strict(dest))
1443 flags |= RT6_LOOKUP_F_IFACE;
1444
1445 return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl,
1446 flags, __ip6_route_redirect);
1447 }
1448
1449 void rt6_redirect(struct in6_addr *dest, struct in6_addr *src,
1450 struct in6_addr *saddr,
1451 struct neighbour *neigh, u8 *lladdr, int on_link)
1452 {
1453 struct rt6_info *rt, *nrt = NULL;
1454 struct netevent_redirect netevent;
1455 struct net *net = dev_net(neigh->dev);
1456
1457 rt = ip6_route_redirect(dest, src, saddr, neigh->dev);
1458
1459 if (rt == net->ipv6.ip6_null_entry) {
1460 if (net_ratelimit())
1461 printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
1462 "for redirect target\n");
1463 goto out;
1464 }
1465
1466 /*
1467 * We have finally decided to accept it.
1468 */
1469
1470 neigh_update(neigh, lladdr, NUD_STALE,
1471 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1472 NEIGH_UPDATE_F_OVERRIDE|
1473 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1474 NEIGH_UPDATE_F_ISROUTER))
1475 );
1476
1477 /*
1478 * Redirect received -> path was valid.
1479 * Look, redirects are sent only in response to data packets,
1480 * so that this nexthop apparently is reachable. --ANK
1481 */
1482 dst_confirm(&rt->u.dst);
1483
1484 /* Duplicate redirect: silently ignore. */
1485 if (neigh == rt->u.dst.neighbour)
1486 goto out;
1487
1488 nrt = ip6_rt_copy(rt);
1489 if (nrt == NULL)
1490 goto out;
1491
1492 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1493 if (on_link)
1494 nrt->rt6i_flags &= ~RTF_GATEWAY;
1495
1496 ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
1497 nrt->rt6i_dst.plen = 128;
1498 nrt->u.dst.flags |= DST_HOST;
1499
1500 ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
1501 nrt->rt6i_nexthop = neigh_clone(neigh);
1502 /* Reset pmtu, it may be better */
1503 nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
1504 nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dev_net(neigh->dev),
1505 dst_mtu(&nrt->u.dst));
1506
1507 if (ip6_ins_rt(nrt))
1508 goto out;
1509
1510 netevent.old = &rt->u.dst;
1511 netevent.new = &nrt->u.dst;
1512 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1513
1514 if (rt->rt6i_flags&RTF_CACHE) {
1515 ip6_del_rt(rt);
1516 return;
1517 }
1518
1519 out:
1520 dst_release(&rt->u.dst);
1521 return;
1522 }
1523
1524 /*
1525 * Handle ICMP "packet too big" messages
1526 * i.e. Path MTU discovery
1527 */
1528
1529 void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
1530 struct net_device *dev, u32 pmtu)
1531 {
1532 struct rt6_info *rt, *nrt;
1533 struct net *net = dev_net(dev);
1534 int allfrag = 0;
1535
1536 rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0);
1537 if (rt == NULL)
1538 return;
1539
1540 if (pmtu >= dst_mtu(&rt->u.dst))
1541 goto out;
1542
1543 if (pmtu < IPV6_MIN_MTU) {
1544 /*
1545 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
1546 * MTU (1280) and a fragment header should always be included
1547 * after a node receiving Too Big message reporting PMTU is
1548 * less than the IPv6 Minimum Link MTU.
1549 */
1550 pmtu = IPV6_MIN_MTU;
1551 allfrag = 1;
1552 }
1553
1554 /* New mtu received -> path was valid.
1555 They are sent only in response to data packets,
1556 so that this nexthop apparently is reachable. --ANK
1557 */
1558 dst_confirm(&rt->u.dst);
1559
1560 /* Host route. If it is static, it would be better
1561 not to override it, but add new one, so that
1562 when cache entry will expire old pmtu
1563 would return automatically.
1564 */
1565 if (rt->rt6i_flags & RTF_CACHE) {
1566 rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1567 if (allfrag)
1568 rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1569 dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires);
1570 rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
1571 goto out;
1572 }
1573
1574 /* Network route.
1575 Two cases are possible:
1576 1. It is connected route. Action: COW
1577 2. It is gatewayed route or NONEXTHOP route. Action: clone it.
1578 */
1579 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
1580 nrt = rt6_alloc_cow(rt, daddr, saddr);
1581 else
1582 nrt = rt6_alloc_clone(rt, daddr);
1583
1584 if (nrt) {
1585 nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1586 if (allfrag)
1587 nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1588
1589 /* According to RFC 1981, detecting PMTU increase shouldn't be
1590 * happened within 5 mins, the recommended timer is 10 mins.
1591 * Here this route expiration time is set to ip6_rt_mtu_expires
1592 * which is 10 mins. After 10 mins the decreased pmtu is expired
1593 * and detecting PMTU increase will be automatically happened.
1594 */
1595 dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires);
1596 nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
1597
1598 ip6_ins_rt(nrt);
1599 }
1600 out:
1601 dst_release(&rt->u.dst);
1602 }
1603
1604 /*
1605 * Misc support functions
1606 */
1607
1608 static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
1609 {
1610 struct net *net = dev_net(ort->rt6i_dev);
1611 struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
1612
1613 if (rt) {
1614 rt->u.dst.input = ort->u.dst.input;
1615 rt->u.dst.output = ort->u.dst.output;
1616
1617 memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
1618 rt->u.dst.error = ort->u.dst.error;
1619 rt->u.dst.dev = ort->u.dst.dev;
1620 if (rt->u.dst.dev)
1621 dev_hold(rt->u.dst.dev);
1622 rt->rt6i_idev = ort->rt6i_idev;
1623 if (rt->rt6i_idev)
1624 in6_dev_hold(rt->rt6i_idev);
1625 rt->u.dst.lastuse = jiffies;
1626 rt->rt6i_expires = 0;
1627
1628 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
1629 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
1630 rt->rt6i_metric = 0;
1631
1632 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1633 #ifdef CONFIG_IPV6_SUBTREES
1634 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1635 #endif
1636 rt->rt6i_table = ort->rt6i_table;
1637 }
1638 return rt;
1639 }
1640
1641 #ifdef CONFIG_IPV6_ROUTE_INFO
1642 static struct rt6_info *rt6_get_route_info(struct net *net,
1643 struct in6_addr *prefix, int prefixlen,
1644 struct in6_addr *gwaddr, int ifindex)
1645 {
1646 struct fib6_node *fn;
1647 struct rt6_info *rt = NULL;
1648 struct fib6_table *table;
1649
1650 table = fib6_get_table(net, RT6_TABLE_INFO);
1651 if (table == NULL)
1652 return NULL;
1653
1654 write_lock_bh(&table->tb6_lock);
1655 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1656 if (!fn)
1657 goto out;
1658
1659 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1660 if (rt->rt6i_dev->ifindex != ifindex)
1661 continue;
1662 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1663 continue;
1664 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1665 continue;
1666 dst_hold(&rt->u.dst);
1667 break;
1668 }
1669 out:
1670 write_unlock_bh(&table->tb6_lock);
1671 return rt;
1672 }
1673
1674 static struct rt6_info *rt6_add_route_info(struct net *net,
1675 struct in6_addr *prefix, int prefixlen,
1676 struct in6_addr *gwaddr, int ifindex,
1677 unsigned pref)
1678 {
1679 struct fib6_config cfg = {
1680 .fc_table = RT6_TABLE_INFO,
1681 .fc_metric = IP6_RT_PRIO_USER,
1682 .fc_ifindex = ifindex,
1683 .fc_dst_len = prefixlen,
1684 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1685 RTF_UP | RTF_PREF(pref),
1686 .fc_nlinfo.pid = 0,
1687 .fc_nlinfo.nlh = NULL,
1688 .fc_nlinfo.nl_net = net,
1689 };
1690
1691 ipv6_addr_copy(&cfg.fc_dst, prefix);
1692 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1693
1694 /* We should treat it as a default route if prefix length is 0. */
1695 if (!prefixlen)
1696 cfg.fc_flags |= RTF_DEFAULT;
1697
1698 ip6_route_add(&cfg);
1699
1700 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1701 }
1702 #endif
1703
1704 struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
1705 {
1706 struct rt6_info *rt;
1707 struct fib6_table *table;
1708
1709 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1710 if (table == NULL)
1711 return NULL;
1712
1713 write_lock_bh(&table->tb6_lock);
1714 for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) {
1715 if (dev == rt->rt6i_dev &&
1716 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1717 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1718 break;
1719 }
1720 if (rt)
1721 dst_hold(&rt->u.dst);
1722 write_unlock_bh(&table->tb6_lock);
1723 return rt;
1724 }
1725
1726 struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1727 struct net_device *dev,
1728 unsigned int pref)
1729 {
1730 struct fib6_config cfg = {
1731 .fc_table = RT6_TABLE_DFLT,
1732 .fc_metric = IP6_RT_PRIO_USER,
1733 .fc_ifindex = dev->ifindex,
1734 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1735 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1736 .fc_nlinfo.pid = 0,
1737 .fc_nlinfo.nlh = NULL,
1738 .fc_nlinfo.nl_net = dev_net(dev),
1739 };
1740
1741 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1742
1743 ip6_route_add(&cfg);
1744
1745 return rt6_get_dflt_router(gwaddr, dev);
1746 }
1747
1748 void rt6_purge_dflt_routers(struct net *net)
1749 {
1750 struct rt6_info *rt;
1751 struct fib6_table *table;
1752
1753 /* NOTE: Keep consistent with rt6_get_dflt_router */
1754 table = fib6_get_table(net, RT6_TABLE_DFLT);
1755 if (table == NULL)
1756 return;
1757
1758 restart:
1759 read_lock_bh(&table->tb6_lock);
1760 for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) {
1761 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
1762 dst_hold(&rt->u.dst);
1763 read_unlock_bh(&table->tb6_lock);
1764 ip6_del_rt(rt);
1765 goto restart;
1766 }
1767 }
1768 read_unlock_bh(&table->tb6_lock);
1769 }
1770
1771 static void rtmsg_to_fib6_config(struct net *net,
1772 struct in6_rtmsg *rtmsg,
1773 struct fib6_config *cfg)
1774 {
1775 memset(cfg, 0, sizeof(*cfg));
1776
1777 cfg->fc_table = RT6_TABLE_MAIN;
1778 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1779 cfg->fc_metric = rtmsg->rtmsg_metric;
1780 cfg->fc_expires = rtmsg->rtmsg_info;
1781 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1782 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1783 cfg->fc_flags = rtmsg->rtmsg_flags;
1784
1785 cfg->fc_nlinfo.nl_net = net;
1786
1787 ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst);
1788 ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src);
1789 ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway);
1790 }
1791
1792 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1793 {
1794 struct fib6_config cfg;
1795 struct in6_rtmsg rtmsg;
1796 int err;
1797
1798 switch(cmd) {
1799 case SIOCADDRT: /* Add a route */
1800 case SIOCDELRT: /* Delete a route */
1801 if (!capable(CAP_NET_ADMIN))
1802 return -EPERM;
1803 err = copy_from_user(&rtmsg, arg,
1804 sizeof(struct in6_rtmsg));
1805 if (err)
1806 return -EFAULT;
1807
1808 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
1809
1810 rtnl_lock();
1811 switch (cmd) {
1812 case SIOCADDRT:
1813 err = ip6_route_add(&cfg);
1814 break;
1815 case SIOCDELRT:
1816 err = ip6_route_del(&cfg);
1817 break;
1818 default:
1819 err = -EINVAL;
1820 }
1821 rtnl_unlock();
1822
1823 return err;
1824 }
1825
1826 return -EINVAL;
1827 }
1828
1829 /*
1830 * Drop the packet on the floor
1831 */
1832
1833 static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes)
1834 {
1835 int type;
1836 switch (ipstats_mib_noroutes) {
1837 case IPSTATS_MIB_INNOROUTES:
1838 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
1839 if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) {
1840 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS);
1841 break;
1842 }
1843 /* FALLTHROUGH */
1844 case IPSTATS_MIB_OUTNOROUTES:
1845 IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes);
1846 break;
1847 }
1848 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev);
1849 kfree_skb(skb);
1850 return 0;
1851 }
1852
1853 static int ip6_pkt_discard(struct sk_buff *skb)
1854 {
1855 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
1856 }
1857
1858 static int ip6_pkt_discard_out(struct sk_buff *skb)
1859 {
1860 skb->dev = skb->dst->dev;
1861 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1862 }
1863
1864 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
1865
1866 static int ip6_pkt_prohibit(struct sk_buff *skb)
1867 {
1868 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
1869 }
1870
1871 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
1872 {
1873 skb->dev = skb->dst->dev;
1874 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
1875 }
1876
1877 #endif
1878
1879 /*
1880 * Allocate a dst for local (unicast / anycast) address.
1881 */
1882
1883 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
1884 const struct in6_addr *addr,
1885 int anycast)
1886 {
1887 struct net *net = dev_net(idev->dev);
1888 struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
1889
1890 if (rt == NULL)
1891 return ERR_PTR(-ENOMEM);
1892
1893 dev_hold(net->loopback_dev);
1894 in6_dev_hold(idev);
1895
1896 rt->u.dst.flags = DST_HOST;
1897 rt->u.dst.input = ip6_input;
1898 rt->u.dst.output = ip6_output;
1899 rt->rt6i_dev = net->loopback_dev;
1900 rt->rt6i_idev = idev;
1901 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
1902 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
1903 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1904 rt->u.dst.obsolete = -1;
1905
1906 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
1907 if (anycast)
1908 rt->rt6i_flags |= RTF_ANYCAST;
1909 else
1910 rt->rt6i_flags |= RTF_LOCAL;
1911 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
1912 if (rt->rt6i_nexthop == NULL) {
1913 dst_free(&rt->u.dst);
1914 return ERR_PTR(-ENOMEM);
1915 }
1916
1917 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
1918 rt->rt6i_dst.plen = 128;
1919 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
1920
1921 atomic_set(&rt->u.dst.__refcnt, 1);
1922
1923 return rt;
1924 }
1925
1926 struct arg_dev_net {
1927 struct net_device *dev;
1928 struct net *net;
1929 };
1930
1931 static int fib6_ifdown(struct rt6_info *rt, void *arg)
1932 {
1933 struct net_device *dev = ((struct arg_dev_net *)arg)->dev;
1934 struct net *net = ((struct arg_dev_net *)arg)->net;
1935
1936 if (((void *)rt->rt6i_dev == dev || dev == NULL) &&
1937 rt != net->ipv6.ip6_null_entry) {
1938 RT6_TRACE("deleted by ifdown %p\n", rt);
1939 return -1;
1940 }
1941 return 0;
1942 }
1943
1944 void rt6_ifdown(struct net *net, struct net_device *dev)
1945 {
1946 struct arg_dev_net adn = {
1947 .dev = dev,
1948 .net = net,
1949 };
1950
1951 fib6_clean_all(net, fib6_ifdown, 0, &adn);
1952 icmp6_clean_all(fib6_ifdown, &adn);
1953 }
1954
1955 struct rt6_mtu_change_arg
1956 {
1957 struct net_device *dev;
1958 unsigned mtu;
1959 };
1960
1961 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
1962 {
1963 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
1964 struct inet6_dev *idev;
1965 struct net *net = dev_net(arg->dev);
1966
1967 /* In IPv6 pmtu discovery is not optional,
1968 so that RTAX_MTU lock cannot disable it.
1969 We still use this lock to block changes
1970 caused by addrconf/ndisc.
1971 */
1972
1973 idev = __in6_dev_get(arg->dev);
1974 if (idev == NULL)
1975 return 0;
1976
1977 /* For administrative MTU increase, there is no way to discover
1978 IPv6 PMTU increase, so PMTU increase should be updated here.
1979 Since RFC 1981 doesn't include administrative MTU increase
1980 update PMTU increase is a MUST. (i.e. jumbo frame)
1981 */
1982 /*
1983 If new MTU is less than route PMTU, this new MTU will be the
1984 lowest MTU in the path, update the route PMTU to reflect PMTU
1985 decreases; if new MTU is greater than route PMTU, and the
1986 old MTU is the lowest MTU in the path, update the route PMTU
1987 to reflect the increase. In this case if the other nodes' MTU
1988 also have the lowest MTU, TOO BIG MESSAGE will be lead to
1989 PMTU discouvery.
1990 */
1991 if (rt->rt6i_dev == arg->dev &&
1992 !dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
1993 (dst_mtu(&rt->u.dst) >= arg->mtu ||
1994 (dst_mtu(&rt->u.dst) < arg->mtu &&
1995 dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) {
1996 rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
1997 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu);
1998 }
1999 return 0;
2000 }
2001
2002 void rt6_mtu_change(struct net_device *dev, unsigned mtu)
2003 {
2004 struct rt6_mtu_change_arg arg = {
2005 .dev = dev,
2006 .mtu = mtu,
2007 };
2008
2009 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2010 }
2011
2012 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2013 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2014 [RTA_OIF] = { .type = NLA_U32 },
2015 [RTA_IIF] = { .type = NLA_U32 },
2016 [RTA_PRIORITY] = { .type = NLA_U32 },
2017 [RTA_METRICS] = { .type = NLA_NESTED },
2018 };
2019
2020 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2021 struct fib6_config *cfg)
2022 {
2023 struct rtmsg *rtm;
2024 struct nlattr *tb[RTA_MAX+1];
2025 int err;
2026
2027 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2028 if (err < 0)
2029 goto errout;
2030
2031 err = -EINVAL;
2032 rtm = nlmsg_data(nlh);
2033 memset(cfg, 0, sizeof(*cfg));
2034
2035 cfg->fc_table = rtm->rtm_table;
2036 cfg->fc_dst_len = rtm->rtm_dst_len;
2037 cfg->fc_src_len = rtm->rtm_src_len;
2038 cfg->fc_flags = RTF_UP;
2039 cfg->fc_protocol = rtm->rtm_protocol;
2040
2041 if (rtm->rtm_type == RTN_UNREACHABLE)
2042 cfg->fc_flags |= RTF_REJECT;
2043
2044 cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
2045 cfg->fc_nlinfo.nlh = nlh;
2046 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2047
2048 if (tb[RTA_GATEWAY]) {
2049 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2050 cfg->fc_flags |= RTF_GATEWAY;
2051 }
2052
2053 if (tb[RTA_DST]) {
2054 int plen = (rtm->rtm_dst_len + 7) >> 3;
2055
2056 if (nla_len(tb[RTA_DST]) < plen)
2057 goto errout;
2058
2059 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2060 }
2061
2062 if (tb[RTA_SRC]) {
2063 int plen = (rtm->rtm_src_len + 7) >> 3;
2064
2065 if (nla_len(tb[RTA_SRC]) < plen)
2066 goto errout;
2067
2068 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2069 }
2070
2071 if (tb[RTA_OIF])
2072 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2073
2074 if (tb[RTA_PRIORITY])
2075 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2076
2077 if (tb[RTA_METRICS]) {
2078 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2079 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2080 }
2081
2082 if (tb[RTA_TABLE])
2083 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2084
2085 err = 0;
2086 errout:
2087 return err;
2088 }
2089
2090 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2091 {
2092 struct fib6_config cfg;
2093 int err;
2094
2095 err = rtm_to_fib6_config(skb, nlh, &cfg);
2096 if (err < 0)
2097 return err;
2098
2099 return ip6_route_del(&cfg);
2100 }
2101
2102 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2103 {
2104 struct fib6_config cfg;
2105 int err;
2106
2107 err = rtm_to_fib6_config(skb, nlh, &cfg);
2108 if (err < 0)
2109 return err;
2110
2111 return ip6_route_add(&cfg);
2112 }
2113
2114 static inline size_t rt6_nlmsg_size(void)
2115 {
2116 return NLMSG_ALIGN(sizeof(struct rtmsg))
2117 + nla_total_size(16) /* RTA_SRC */
2118 + nla_total_size(16) /* RTA_DST */
2119 + nla_total_size(16) /* RTA_GATEWAY */
2120 + nla_total_size(16) /* RTA_PREFSRC */
2121 + nla_total_size(4) /* RTA_TABLE */
2122 + nla_total_size(4) /* RTA_IIF */
2123 + nla_total_size(4) /* RTA_OIF */
2124 + nla_total_size(4) /* RTA_PRIORITY */
2125 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2126 + nla_total_size(sizeof(struct rta_cacheinfo));
2127 }
2128
2129 static int rt6_fill_node(struct net *net,
2130 struct sk_buff *skb, struct rt6_info *rt,
2131 struct in6_addr *dst, struct in6_addr *src,
2132 int iif, int type, u32 pid, u32 seq,
2133 int prefix, int nowait, unsigned int flags)
2134 {
2135 struct rtmsg *rtm;
2136 struct nlmsghdr *nlh;
2137 long expires;
2138 u32 table;
2139
2140 if (prefix) { /* user wants prefix routes only */
2141 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2142 /* success since this is not a prefix route */
2143 return 1;
2144 }
2145 }
2146
2147 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
2148 if (nlh == NULL)
2149 return -EMSGSIZE;
2150
2151 rtm = nlmsg_data(nlh);
2152 rtm->rtm_family = AF_INET6;
2153 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2154 rtm->rtm_src_len = rt->rt6i_src.plen;
2155 rtm->rtm_tos = 0;
2156 if (rt->rt6i_table)
2157 table = rt->rt6i_table->tb6_id;
2158 else
2159 table = RT6_TABLE_UNSPEC;
2160 rtm->rtm_table = table;
2161 NLA_PUT_U32(skb, RTA_TABLE, table);
2162 if (rt->rt6i_flags&RTF_REJECT)
2163 rtm->rtm_type = RTN_UNREACHABLE;
2164 else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
2165 rtm->rtm_type = RTN_LOCAL;
2166 else
2167 rtm->rtm_type = RTN_UNICAST;
2168 rtm->rtm_flags = 0;
2169 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2170 rtm->rtm_protocol = rt->rt6i_protocol;
2171 if (rt->rt6i_flags&RTF_DYNAMIC)
2172 rtm->rtm_protocol = RTPROT_REDIRECT;
2173 else if (rt->rt6i_flags & RTF_ADDRCONF)
2174 rtm->rtm_protocol = RTPROT_KERNEL;
2175 else if (rt->rt6i_flags&RTF_DEFAULT)
2176 rtm->rtm_protocol = RTPROT_RA;
2177
2178 if (rt->rt6i_flags&RTF_CACHE)
2179 rtm->rtm_flags |= RTM_F_CLONED;
2180
2181 if (dst) {
2182 NLA_PUT(skb, RTA_DST, 16, dst);
2183 rtm->rtm_dst_len = 128;
2184 } else if (rtm->rtm_dst_len)
2185 NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
2186 #ifdef CONFIG_IPV6_SUBTREES
2187 if (src) {
2188 NLA_PUT(skb, RTA_SRC, 16, src);
2189 rtm->rtm_src_len = 128;
2190 } else if (rtm->rtm_src_len)
2191 NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
2192 #endif
2193 if (iif) {
2194 #ifdef CONFIG_IPV6_MROUTE
2195 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2196 int err = ip6mr_get_route(skb, rtm, nowait);
2197 if (err <= 0) {
2198 if (!nowait) {
2199 if (err == 0)
2200 return 0;
2201 goto nla_put_failure;
2202 } else {
2203 if (err == -EMSGSIZE)
2204 goto nla_put_failure;
2205 }
2206 }
2207 } else
2208 #endif
2209 NLA_PUT_U32(skb, RTA_IIF, iif);
2210 } else if (dst) {
2211 struct inet6_dev *idev = ip6_dst_idev(&rt->u.dst);
2212 struct in6_addr saddr_buf;
2213 if (ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2214 dst, 0, &saddr_buf) == 0)
2215 NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
2216 }
2217
2218 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
2219 goto nla_put_failure;
2220
2221 if (rt->u.dst.neighbour)
2222 NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);
2223
2224 if (rt->u.dst.dev)
2225 NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex);
2226
2227 NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric);
2228
2229 if (!(rt->rt6i_flags & RTF_EXPIRES))
2230 expires = 0;
2231 else if (rt->rt6i_expires - jiffies < INT_MAX)
2232 expires = rt->rt6i_expires - jiffies;
2233 else
2234 expires = INT_MAX;
2235
2236 if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0,
2237 expires, rt->u.dst.error) < 0)
2238 goto nla_put_failure;
2239
2240 return nlmsg_end(skb, nlh);
2241
2242 nla_put_failure:
2243 nlmsg_cancel(skb, nlh);
2244 return -EMSGSIZE;
2245 }
2246
2247 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2248 {
2249 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2250 int prefix;
2251
2252 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2253 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2254 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2255 } else
2256 prefix = 0;
2257
2258 return rt6_fill_node(arg->net,
2259 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2260 NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
2261 prefix, 0, NLM_F_MULTI);
2262 }
2263
2264 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
2265 {
2266 struct net *net = sock_net(in_skb->sk);
2267 struct nlattr *tb[RTA_MAX+1];
2268 struct rt6_info *rt;
2269 struct sk_buff *skb;
2270 struct rtmsg *rtm;
2271 struct flowi fl;
2272 int err, iif = 0;
2273
2274 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2275 if (err < 0)
2276 goto errout;
2277
2278 err = -EINVAL;
2279 memset(&fl, 0, sizeof(fl));
2280
2281 if (tb[RTA_SRC]) {
2282 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2283 goto errout;
2284
2285 ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC]));
2286 }
2287
2288 if (tb[RTA_DST]) {
2289 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2290 goto errout;
2291
2292 ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST]));
2293 }
2294
2295 if (tb[RTA_IIF])
2296 iif = nla_get_u32(tb[RTA_IIF]);
2297
2298 if (tb[RTA_OIF])
2299 fl.oif = nla_get_u32(tb[RTA_OIF]);
2300
2301 if (iif) {
2302 struct net_device *dev;
2303 dev = __dev_get_by_index(net, iif);
2304 if (!dev) {
2305 err = -ENODEV;
2306 goto errout;
2307 }
2308 }
2309
2310 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2311 if (skb == NULL) {
2312 err = -ENOBUFS;
2313 goto errout;
2314 }
2315
2316 /* Reserve room for dummy headers, this skb can pass
2317 through good chunk of routing engine.
2318 */
2319 skb_reset_mac_header(skb);
2320 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2321
2322 rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl);
2323 skb->dst = &rt->u.dst;
2324
2325 err = rt6_fill_node(net, skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
2326 RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2327 nlh->nlmsg_seq, 0, 0, 0);
2328 if (err < 0) {
2329 kfree_skb(skb);
2330 goto errout;
2331 }
2332
2333 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
2334 errout:
2335 return err;
2336 }
2337
2338 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2339 {
2340 struct sk_buff *skb;
2341 struct net *net = info->nl_net;
2342 u32 seq;
2343 int err;
2344
2345 err = -ENOBUFS;
2346 seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0;
2347
2348 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2349 if (skb == NULL)
2350 goto errout;
2351
2352 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2353 event, info->pid, seq, 0, 0, 0);
2354 if (err < 0) {
2355 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2356 WARN_ON(err == -EMSGSIZE);
2357 kfree_skb(skb);
2358 goto errout;
2359 }
2360 err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE,
2361 info->nlh, gfp_any());
2362 errout:
2363 if (err < 0)
2364 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2365 }
2366
2367 static int ip6_route_dev_notify(struct notifier_block *this,
2368 unsigned long event, void *data)
2369 {
2370 struct net_device *dev = (struct net_device *)data;
2371 struct net *net = dev_net(dev);
2372
2373 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2374 net->ipv6.ip6_null_entry->u.dst.dev = dev;
2375 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2376 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2377 net->ipv6.ip6_prohibit_entry->u.dst.dev = dev;
2378 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2379 net->ipv6.ip6_blk_hole_entry->u.dst.dev = dev;
2380 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2381 #endif
2382 }
2383
2384 return NOTIFY_OK;
2385 }
2386
2387 /*
2388 * /proc
2389 */
2390
2391 #ifdef CONFIG_PROC_FS
2392
2393 #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1)
2394
2395 struct rt6_proc_arg
2396 {
2397 char *buffer;
2398 int offset;
2399 int length;
2400 int skip;
2401 int len;
2402 };
2403
2404 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2405 {
2406 struct seq_file *m = p_arg;
2407
2408 seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr),
2409 rt->rt6i_dst.plen);
2410
2411 #ifdef CONFIG_IPV6_SUBTREES
2412 seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr),
2413 rt->rt6i_src.plen);
2414 #else
2415 seq_puts(m, "00000000000000000000000000000000 00 ");
2416 #endif
2417
2418 if (rt->rt6i_nexthop) {
2419 seq_printf(m, NIP6_SEQFMT,
2420 NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key)));
2421 } else {
2422 seq_puts(m, "00000000000000000000000000000000");
2423 }
2424 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2425 rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
2426 rt->u.dst.__use, rt->rt6i_flags,
2427 rt->rt6i_dev ? rt->rt6i_dev->name : "");
2428 return 0;
2429 }
2430
2431 static int ipv6_route_show(struct seq_file *m, void *v)
2432 {
2433 struct net *net = (struct net *)m->private;
2434 fib6_clean_all(net, rt6_info_route, 0, m);
2435 return 0;
2436 }
2437
2438 static int ipv6_route_open(struct inode *inode, struct file *file)
2439 {
2440 return single_open_net(inode, file, ipv6_route_show);
2441 }
2442
2443 static const struct file_operations ipv6_route_proc_fops = {
2444 .owner = THIS_MODULE,
2445 .open = ipv6_route_open,
2446 .read = seq_read,
2447 .llseek = seq_lseek,
2448 .release = single_release_net,
2449 };
2450
2451 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2452 {
2453 struct net *net = (struct net *)seq->private;
2454 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2455 net->ipv6.rt6_stats->fib_nodes,
2456 net->ipv6.rt6_stats->fib_route_nodes,
2457 net->ipv6.rt6_stats->fib_rt_alloc,
2458 net->ipv6.rt6_stats->fib_rt_entries,
2459 net->ipv6.rt6_stats->fib_rt_cache,
2460 atomic_read(&net->ipv6.ip6_dst_ops->entries),
2461 net->ipv6.rt6_stats->fib_discarded_routes);
2462
2463 return 0;
2464 }
2465
2466 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2467 {
2468 return single_open_net(inode, file, rt6_stats_seq_show);
2469 }
2470
2471 static const struct file_operations rt6_stats_seq_fops = {
2472 .owner = THIS_MODULE,
2473 .open = rt6_stats_seq_open,
2474 .read = seq_read,
2475 .llseek = seq_lseek,
2476 .release = single_release_net,
2477 };
2478 #endif /* CONFIG_PROC_FS */
2479
2480 #ifdef CONFIG_SYSCTL
2481
2482 static
2483 int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
2484 void __user *buffer, size_t *lenp, loff_t *ppos)
2485 {
2486 struct net *net = current->nsproxy->net_ns;
2487 int delay = net->ipv6.sysctl.flush_delay;
2488 if (write) {
2489 proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
2490 fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
2491 return 0;
2492 } else
2493 return -EINVAL;
2494 }
2495
2496 ctl_table ipv6_route_table_template[] = {
2497 {
2498 .procname = "flush",
2499 .data = &init_net.ipv6.sysctl.flush_delay,
2500 .maxlen = sizeof(int),
2501 .mode = 0200,
2502 .proc_handler = &ipv6_sysctl_rtcache_flush
2503 },
2504 {
2505 .ctl_name = NET_IPV6_ROUTE_GC_THRESH,
2506 .procname = "gc_thresh",
2507 .data = &ip6_dst_ops_template.gc_thresh,
2508 .maxlen = sizeof(int),
2509 .mode = 0644,
2510 .proc_handler = &proc_dointvec,
2511 },
2512 {
2513 .ctl_name = NET_IPV6_ROUTE_MAX_SIZE,
2514 .procname = "max_size",
2515 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2516 .maxlen = sizeof(int),
2517 .mode = 0644,
2518 .proc_handler = &proc_dointvec,
2519 },
2520 {
2521 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL,
2522 .procname = "gc_min_interval",
2523 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2524 .maxlen = sizeof(int),
2525 .mode = 0644,
2526 .proc_handler = &proc_dointvec_jiffies,
2527 .strategy = &sysctl_jiffies,
2528 },
2529 {
2530 .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT,
2531 .procname = "gc_timeout",
2532 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2533 .maxlen = sizeof(int),
2534 .mode = 0644,
2535 .proc_handler = &proc_dointvec_jiffies,
2536 .strategy = &sysctl_jiffies,
2537 },
2538 {
2539 .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL,
2540 .procname = "gc_interval",
2541 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2542 .maxlen = sizeof(int),
2543 .mode = 0644,
2544 .proc_handler = &proc_dointvec_jiffies,
2545 .strategy = &sysctl_jiffies,
2546 },
2547 {
2548 .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY,
2549 .procname = "gc_elasticity",
2550 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2551 .maxlen = sizeof(int),
2552 .mode = 0644,
2553 .proc_handler = &proc_dointvec_jiffies,
2554 .strategy = &sysctl_jiffies,
2555 },
2556 {
2557 .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES,
2558 .procname = "mtu_expires",
2559 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2560 .maxlen = sizeof(int),
2561 .mode = 0644,
2562 .proc_handler = &proc_dointvec_jiffies,
2563 .strategy = &sysctl_jiffies,
2564 },
2565 {
2566 .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS,
2567 .procname = "min_adv_mss",
2568 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2569 .maxlen = sizeof(int),
2570 .mode = 0644,
2571 .proc_handler = &proc_dointvec_jiffies,
2572 .strategy = &sysctl_jiffies,
2573 },
2574 {
2575 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
2576 .procname = "gc_min_interval_ms",
2577 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2578 .maxlen = sizeof(int),
2579 .mode = 0644,
2580 .proc_handler = &proc_dointvec_ms_jiffies,
2581 .strategy = &sysctl_ms_jiffies,
2582 },
2583 { .ctl_name = 0 }
2584 };
2585
2586 struct ctl_table *ipv6_route_sysctl_init(struct net *net)
2587 {
2588 struct ctl_table *table;
2589
2590 table = kmemdup(ipv6_route_table_template,
2591 sizeof(ipv6_route_table_template),
2592 GFP_KERNEL);
2593
2594 if (table) {
2595 table[0].data = &net->ipv6.sysctl.flush_delay;
2596 table[1].data = &net->ipv6.ip6_dst_ops->gc_thresh;
2597 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2598 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2599 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2600 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2601 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2602 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2603 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2604 }
2605
2606 return table;
2607 }
2608 #endif
2609
2610 static int ip6_route_net_init(struct net *net)
2611 {
2612 int ret = -ENOMEM;
2613
2614 net->ipv6.ip6_dst_ops = kmemdup(&ip6_dst_ops_template,
2615 sizeof(*net->ipv6.ip6_dst_ops),
2616 GFP_KERNEL);
2617 if (!net->ipv6.ip6_dst_ops)
2618 goto out;
2619 net->ipv6.ip6_dst_ops->dst_net = hold_net(net);
2620
2621 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2622 sizeof(*net->ipv6.ip6_null_entry),
2623 GFP_KERNEL);
2624 if (!net->ipv6.ip6_null_entry)
2625 goto out_ip6_dst_ops;
2626 net->ipv6.ip6_null_entry->u.dst.path =
2627 (struct dst_entry *)net->ipv6.ip6_null_entry;
2628 net->ipv6.ip6_null_entry->u.dst.ops = net->ipv6.ip6_dst_ops;
2629
2630 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2631 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2632 sizeof(*net->ipv6.ip6_prohibit_entry),
2633 GFP_KERNEL);
2634 if (!net->ipv6.ip6_prohibit_entry)
2635 goto out_ip6_null_entry;
2636 net->ipv6.ip6_prohibit_entry->u.dst.path =
2637 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
2638 net->ipv6.ip6_prohibit_entry->u.dst.ops = net->ipv6.ip6_dst_ops;
2639
2640 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
2641 sizeof(*net->ipv6.ip6_blk_hole_entry),
2642 GFP_KERNEL);
2643 if (!net->ipv6.ip6_blk_hole_entry)
2644 goto out_ip6_prohibit_entry;
2645 net->ipv6.ip6_blk_hole_entry->u.dst.path =
2646 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
2647 net->ipv6.ip6_blk_hole_entry->u.dst.ops = net->ipv6.ip6_dst_ops;
2648 #endif
2649
2650 net->ipv6.sysctl.flush_delay = 0;
2651 net->ipv6.sysctl.ip6_rt_max_size = 4096;
2652 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
2653 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
2654 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
2655 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
2656 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
2657 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
2658
2659 #ifdef CONFIG_PROC_FS
2660 proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
2661 proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
2662 #endif
2663 net->ipv6.ip6_rt_gc_expire = 30*HZ;
2664
2665 ret = 0;
2666 out:
2667 return ret;
2668
2669 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2670 out_ip6_prohibit_entry:
2671 kfree(net->ipv6.ip6_prohibit_entry);
2672 out_ip6_null_entry:
2673 kfree(net->ipv6.ip6_null_entry);
2674 #endif
2675 out_ip6_dst_ops:
2676 release_net(net->ipv6.ip6_dst_ops->dst_net);
2677 kfree(net->ipv6.ip6_dst_ops);
2678 goto out;
2679 }
2680
2681 static void ip6_route_net_exit(struct net *net)
2682 {
2683 #ifdef CONFIG_PROC_FS
2684 proc_net_remove(net, "ipv6_route");
2685 proc_net_remove(net, "rt6_stats");
2686 #endif
2687 kfree(net->ipv6.ip6_null_entry);
2688 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2689 kfree(net->ipv6.ip6_prohibit_entry);
2690 kfree(net->ipv6.ip6_blk_hole_entry);
2691 #endif
2692 release_net(net->ipv6.ip6_dst_ops->dst_net);
2693 kfree(net->ipv6.ip6_dst_ops);
2694 }
2695
2696 static struct pernet_operations ip6_route_net_ops = {
2697 .init = ip6_route_net_init,
2698 .exit = ip6_route_net_exit,
2699 };
2700
2701 static struct notifier_block ip6_route_dev_notifier = {
2702 .notifier_call = ip6_route_dev_notify,
2703 .priority = 0,
2704 };
2705
2706 int __init ip6_route_init(void)
2707 {
2708 int ret;
2709
2710 ret = -ENOMEM;
2711 ip6_dst_ops_template.kmem_cachep =
2712 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
2713 SLAB_HWCACHE_ALIGN, NULL);
2714 if (!ip6_dst_ops_template.kmem_cachep)
2715 goto out;;
2716
2717 ret = register_pernet_subsys(&ip6_route_net_ops);
2718 if (ret)
2719 goto out_kmem_cache;
2720
2721 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
2722
2723 /* Registering of the loopback is done before this portion of code,
2724 * the loopback reference in rt6_info will not be taken, do it
2725 * manually for init_net */
2726 init_net.ipv6.ip6_null_entry->u.dst.dev = init_net.loopback_dev;
2727 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
2728 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2729 init_net.ipv6.ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev;
2730 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
2731 init_net.ipv6.ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev;
2732 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
2733 #endif
2734 ret = fib6_init();
2735 if (ret)
2736 goto out_register_subsys;
2737
2738 ret = xfrm6_init();
2739 if (ret)
2740 goto out_fib6_init;
2741
2742 ret = fib6_rules_init();
2743 if (ret)
2744 goto xfrm6_init;
2745
2746 ret = -ENOBUFS;
2747 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) ||
2748 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) ||
2749 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL))
2750 goto fib6_rules_init;
2751
2752 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
2753 if (ret)
2754 goto fib6_rules_init;
2755
2756 out:
2757 return ret;
2758
2759 fib6_rules_init:
2760 fib6_rules_cleanup();
2761 xfrm6_init:
2762 xfrm6_fini();
2763 out_fib6_init:
2764 fib6_gc_cleanup();
2765 out_register_subsys:
2766 unregister_pernet_subsys(&ip6_route_net_ops);
2767 out_kmem_cache:
2768 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
2769 goto out;
2770 }
2771
2772 void ip6_route_cleanup(void)
2773 {
2774 unregister_netdevice_notifier(&ip6_route_dev_notifier);
2775 fib6_rules_cleanup();
2776 xfrm6_fini();
2777 fib6_gc_cleanup();
2778 unregister_pernet_subsys(&ip6_route_net_ops);
2779 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
2780 }
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