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Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixes
[deliverable/linux.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 #define pr_fmt(fmt) "IPv6: " fmt
28
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
48 #include <net/snmp.h>
49 #include <net/ipv6.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
54 #include <net/tcp.h>
55 #include <linux/rtnetlink.h>
56 #include <net/dst.h>
57 #include <net/xfrm.h>
58 #include <net/netevent.h>
59 #include <net/netlink.h>
60 #include <net/nexthop.h>
61
62 #include <asm/uaccess.h>
63
64 #ifdef CONFIG_SYSCTL
65 #include <linux/sysctl.h>
66 #endif
67
68 enum rt6_nud_state {
69 RT6_NUD_FAIL_HARD = -2,
70 RT6_NUD_FAIL_SOFT = -1,
71 RT6_NUD_SUCCEED = 1
72 };
73
74 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
75 const struct in6_addr *dest);
76 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
77 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
78 static unsigned int ip6_mtu(const struct dst_entry *dst);
79 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
80 static void ip6_dst_destroy(struct dst_entry *);
81 static void ip6_dst_ifdown(struct dst_entry *,
82 struct net_device *dev, int how);
83 static int ip6_dst_gc(struct dst_ops *ops);
84
85 static int ip6_pkt_discard(struct sk_buff *skb);
86 static int ip6_pkt_discard_out(struct sk_buff *skb);
87 static void ip6_link_failure(struct sk_buff *skb);
88 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
89 struct sk_buff *skb, u32 mtu);
90 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
91 struct sk_buff *skb);
92 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
93
94 #ifdef CONFIG_IPV6_ROUTE_INFO
95 static struct rt6_info *rt6_add_route_info(struct net *net,
96 const struct in6_addr *prefix, int prefixlen,
97 const struct in6_addr *gwaddr, int ifindex,
98 unsigned int pref);
99 static struct rt6_info *rt6_get_route_info(struct net *net,
100 const struct in6_addr *prefix, int prefixlen,
101 const struct in6_addr *gwaddr, int ifindex);
102 #endif
103
104 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
105 {
106 struct rt6_info *rt = (struct rt6_info *) dst;
107 struct inet_peer *peer;
108 u32 *p = NULL;
109
110 if (!(rt->dst.flags & DST_HOST))
111 return NULL;
112
113 peer = rt6_get_peer_create(rt);
114 if (peer) {
115 u32 *old_p = __DST_METRICS_PTR(old);
116 unsigned long prev, new;
117
118 p = peer->metrics;
119 if (inet_metrics_new(peer))
120 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
121
122 new = (unsigned long) p;
123 prev = cmpxchg(&dst->_metrics, old, new);
124
125 if (prev != old) {
126 p = __DST_METRICS_PTR(prev);
127 if (prev & DST_METRICS_READ_ONLY)
128 p = NULL;
129 }
130 }
131 return p;
132 }
133
134 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
135 struct sk_buff *skb,
136 const void *daddr)
137 {
138 struct in6_addr *p = &rt->rt6i_gateway;
139
140 if (!ipv6_addr_any(p))
141 return (const void *) p;
142 else if (skb)
143 return &ipv6_hdr(skb)->daddr;
144 return daddr;
145 }
146
147 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
148 struct sk_buff *skb,
149 const void *daddr)
150 {
151 struct rt6_info *rt = (struct rt6_info *) dst;
152 struct neighbour *n;
153
154 daddr = choose_neigh_daddr(rt, skb, daddr);
155 n = __ipv6_neigh_lookup(dst->dev, daddr);
156 if (n)
157 return n;
158 return neigh_create(&nd_tbl, daddr, dst->dev);
159 }
160
161 static struct dst_ops ip6_dst_ops_template = {
162 .family = AF_INET6,
163 .protocol = cpu_to_be16(ETH_P_IPV6),
164 .gc = ip6_dst_gc,
165 .gc_thresh = 1024,
166 .check = ip6_dst_check,
167 .default_advmss = ip6_default_advmss,
168 .mtu = ip6_mtu,
169 .cow_metrics = ipv6_cow_metrics,
170 .destroy = ip6_dst_destroy,
171 .ifdown = ip6_dst_ifdown,
172 .negative_advice = ip6_negative_advice,
173 .link_failure = ip6_link_failure,
174 .update_pmtu = ip6_rt_update_pmtu,
175 .redirect = rt6_do_redirect,
176 .local_out = __ip6_local_out,
177 .neigh_lookup = ip6_neigh_lookup,
178 };
179
180 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
181 {
182 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
183
184 return mtu ? : dst->dev->mtu;
185 }
186
187 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
188 struct sk_buff *skb, u32 mtu)
189 {
190 }
191
192 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
193 struct sk_buff *skb)
194 {
195 }
196
197 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
198 unsigned long old)
199 {
200 return NULL;
201 }
202
203 static struct dst_ops ip6_dst_blackhole_ops = {
204 .family = AF_INET6,
205 .protocol = cpu_to_be16(ETH_P_IPV6),
206 .destroy = ip6_dst_destroy,
207 .check = ip6_dst_check,
208 .mtu = ip6_blackhole_mtu,
209 .default_advmss = ip6_default_advmss,
210 .update_pmtu = ip6_rt_blackhole_update_pmtu,
211 .redirect = ip6_rt_blackhole_redirect,
212 .cow_metrics = ip6_rt_blackhole_cow_metrics,
213 .neigh_lookup = ip6_neigh_lookup,
214 };
215
216 static const u32 ip6_template_metrics[RTAX_MAX] = {
217 [RTAX_HOPLIMIT - 1] = 0,
218 };
219
220 static const struct rt6_info ip6_null_entry_template = {
221 .dst = {
222 .__refcnt = ATOMIC_INIT(1),
223 .__use = 1,
224 .obsolete = DST_OBSOLETE_FORCE_CHK,
225 .error = -ENETUNREACH,
226 .input = ip6_pkt_discard,
227 .output = ip6_pkt_discard_out,
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 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
236
237 static int ip6_pkt_prohibit(struct sk_buff *skb);
238 static int ip6_pkt_prohibit_out(struct sk_buff *skb);
239
240 static const struct rt6_info ip6_prohibit_entry_template = {
241 .dst = {
242 .__refcnt = ATOMIC_INIT(1),
243 .__use = 1,
244 .obsolete = DST_OBSOLETE_FORCE_CHK,
245 .error = -EACCES,
246 .input = ip6_pkt_prohibit,
247 .output = ip6_pkt_prohibit_out,
248 },
249 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
250 .rt6i_protocol = RTPROT_KERNEL,
251 .rt6i_metric = ~(u32) 0,
252 .rt6i_ref = ATOMIC_INIT(1),
253 };
254
255 static const struct rt6_info ip6_blk_hole_entry_template = {
256 .dst = {
257 .__refcnt = ATOMIC_INIT(1),
258 .__use = 1,
259 .obsolete = DST_OBSOLETE_FORCE_CHK,
260 .error = -EINVAL,
261 .input = dst_discard,
262 .output = dst_discard,
263 },
264 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
265 .rt6i_protocol = RTPROT_KERNEL,
266 .rt6i_metric = ~(u32) 0,
267 .rt6i_ref = ATOMIC_INIT(1),
268 };
269
270 #endif
271
272 /* allocate dst with ip6_dst_ops */
273 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
274 struct net_device *dev,
275 int flags,
276 struct fib6_table *table)
277 {
278 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
279 0, DST_OBSOLETE_FORCE_CHK, flags);
280
281 if (rt) {
282 struct dst_entry *dst = &rt->dst;
283
284 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
285 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
286 rt->rt6i_genid = rt_genid(net);
287 INIT_LIST_HEAD(&rt->rt6i_siblings);
288 rt->rt6i_nsiblings = 0;
289 }
290 return rt;
291 }
292
293 static void ip6_dst_destroy(struct dst_entry *dst)
294 {
295 struct rt6_info *rt = (struct rt6_info *)dst;
296 struct inet6_dev *idev = rt->rt6i_idev;
297 struct dst_entry *from = dst->from;
298
299 if (!(rt->dst.flags & DST_HOST))
300 dst_destroy_metrics_generic(dst);
301
302 if (idev) {
303 rt->rt6i_idev = NULL;
304 in6_dev_put(idev);
305 }
306
307 dst->from = NULL;
308 dst_release(from);
309
310 if (rt6_has_peer(rt)) {
311 struct inet_peer *peer = rt6_peer_ptr(rt);
312 inet_putpeer(peer);
313 }
314 }
315
316 void rt6_bind_peer(struct rt6_info *rt, int create)
317 {
318 struct inet_peer_base *base;
319 struct inet_peer *peer;
320
321 base = inetpeer_base_ptr(rt->_rt6i_peer);
322 if (!base)
323 return;
324
325 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
326 if (peer) {
327 if (!rt6_set_peer(rt, peer))
328 inet_putpeer(peer);
329 }
330 }
331
332 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
333 int how)
334 {
335 struct rt6_info *rt = (struct rt6_info *)dst;
336 struct inet6_dev *idev = rt->rt6i_idev;
337 struct net_device *loopback_dev =
338 dev_net(dev)->loopback_dev;
339
340 if (dev != loopback_dev) {
341 if (idev && idev->dev == dev) {
342 struct inet6_dev *loopback_idev =
343 in6_dev_get(loopback_dev);
344 if (loopback_idev) {
345 rt->rt6i_idev = loopback_idev;
346 in6_dev_put(idev);
347 }
348 }
349 }
350 }
351
352 static bool rt6_check_expired(const struct rt6_info *rt)
353 {
354 if (rt->rt6i_flags & RTF_EXPIRES) {
355 if (time_after(jiffies, rt->dst.expires))
356 return true;
357 } else if (rt->dst.from) {
358 return rt6_check_expired((struct rt6_info *) rt->dst.from);
359 }
360 return false;
361 }
362
363 static bool rt6_need_strict(const struct in6_addr *daddr)
364 {
365 return ipv6_addr_type(daddr) &
366 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
367 }
368
369 /* Multipath route selection:
370 * Hash based function using packet header and flowlabel.
371 * Adapted from fib_info_hashfn()
372 */
373 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
374 const struct flowi6 *fl6)
375 {
376 unsigned int val = fl6->flowi6_proto;
377
378 val ^= ipv6_addr_hash(&fl6->daddr);
379 val ^= ipv6_addr_hash(&fl6->saddr);
380
381 /* Work only if this not encapsulated */
382 switch (fl6->flowi6_proto) {
383 case IPPROTO_UDP:
384 case IPPROTO_TCP:
385 case IPPROTO_SCTP:
386 val ^= (__force u16)fl6->fl6_sport;
387 val ^= (__force u16)fl6->fl6_dport;
388 break;
389
390 case IPPROTO_ICMPV6:
391 val ^= (__force u16)fl6->fl6_icmp_type;
392 val ^= (__force u16)fl6->fl6_icmp_code;
393 break;
394 }
395 /* RFC6438 recommands to use flowlabel */
396 val ^= (__force u32)fl6->flowlabel;
397
398 /* Perhaps, we need to tune, this function? */
399 val = val ^ (val >> 7) ^ (val >> 12);
400 return val % candidate_count;
401 }
402
403 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
404 struct flowi6 *fl6, int oif,
405 int strict)
406 {
407 struct rt6_info *sibling, *next_sibling;
408 int route_choosen;
409
410 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
411 /* Don't change the route, if route_choosen == 0
412 * (siblings does not include ourself)
413 */
414 if (route_choosen)
415 list_for_each_entry_safe(sibling, next_sibling,
416 &match->rt6i_siblings, rt6i_siblings) {
417 route_choosen--;
418 if (route_choosen == 0) {
419 if (rt6_score_route(sibling, oif, strict) < 0)
420 break;
421 match = sibling;
422 break;
423 }
424 }
425 return match;
426 }
427
428 /*
429 * Route lookup. Any table->tb6_lock is implied.
430 */
431
432 static inline struct rt6_info *rt6_device_match(struct net *net,
433 struct rt6_info *rt,
434 const struct in6_addr *saddr,
435 int oif,
436 int flags)
437 {
438 struct rt6_info *local = NULL;
439 struct rt6_info *sprt;
440
441 if (!oif && ipv6_addr_any(saddr))
442 goto out;
443
444 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
445 struct net_device *dev = sprt->dst.dev;
446
447 if (oif) {
448 if (dev->ifindex == oif)
449 return sprt;
450 if (dev->flags & IFF_LOOPBACK) {
451 if (!sprt->rt6i_idev ||
452 sprt->rt6i_idev->dev->ifindex != oif) {
453 if (flags & RT6_LOOKUP_F_IFACE && oif)
454 continue;
455 if (local && (!oif ||
456 local->rt6i_idev->dev->ifindex == oif))
457 continue;
458 }
459 local = sprt;
460 }
461 } else {
462 if (ipv6_chk_addr(net, saddr, dev,
463 flags & RT6_LOOKUP_F_IFACE))
464 return sprt;
465 }
466 }
467
468 if (oif) {
469 if (local)
470 return local;
471
472 if (flags & RT6_LOOKUP_F_IFACE)
473 return net->ipv6.ip6_null_entry;
474 }
475 out:
476 return rt;
477 }
478
479 #ifdef CONFIG_IPV6_ROUTER_PREF
480 static void rt6_probe(struct rt6_info *rt)
481 {
482 struct neighbour *neigh;
483 /*
484 * Okay, this does not seem to be appropriate
485 * for now, however, we need to check if it
486 * is really so; aka Router Reachability Probing.
487 *
488 * Router Reachability Probe MUST be rate-limited
489 * to no more than one per minute.
490 */
491 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
492 return;
493 rcu_read_lock_bh();
494 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
495 if (neigh) {
496 write_lock(&neigh->lock);
497 if (neigh->nud_state & NUD_VALID)
498 goto out;
499 }
500
501 if (!neigh ||
502 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
503 struct in6_addr mcaddr;
504 struct in6_addr *target;
505
506 if (neigh) {
507 neigh->updated = jiffies;
508 write_unlock(&neigh->lock);
509 }
510
511 target = (struct in6_addr *)&rt->rt6i_gateway;
512 addrconf_addr_solict_mult(target, &mcaddr);
513 ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL);
514 } else {
515 out:
516 write_unlock(&neigh->lock);
517 }
518 rcu_read_unlock_bh();
519 }
520 #else
521 static inline void rt6_probe(struct rt6_info *rt)
522 {
523 }
524 #endif
525
526 /*
527 * Default Router Selection (RFC 2461 6.3.6)
528 */
529 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
530 {
531 struct net_device *dev = rt->dst.dev;
532 if (!oif || dev->ifindex == oif)
533 return 2;
534 if ((dev->flags & IFF_LOOPBACK) &&
535 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
536 return 1;
537 return 0;
538 }
539
540 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
541 {
542 struct neighbour *neigh;
543 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
544
545 if (rt->rt6i_flags & RTF_NONEXTHOP ||
546 !(rt->rt6i_flags & RTF_GATEWAY))
547 return RT6_NUD_SUCCEED;
548
549 rcu_read_lock_bh();
550 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
551 if (neigh) {
552 read_lock(&neigh->lock);
553 if (neigh->nud_state & NUD_VALID)
554 ret = RT6_NUD_SUCCEED;
555 #ifdef CONFIG_IPV6_ROUTER_PREF
556 else if (!(neigh->nud_state & NUD_FAILED))
557 ret = RT6_NUD_SUCCEED;
558 #endif
559 read_unlock(&neigh->lock);
560 } else {
561 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
562 RT6_NUD_SUCCEED : RT6_NUD_FAIL_SOFT;
563 }
564 rcu_read_unlock_bh();
565
566 return ret;
567 }
568
569 static int rt6_score_route(struct rt6_info *rt, int oif,
570 int strict)
571 {
572 int m;
573
574 m = rt6_check_dev(rt, oif);
575 if (!m && (strict & RT6_LOOKUP_F_IFACE))
576 return RT6_NUD_FAIL_HARD;
577 #ifdef CONFIG_IPV6_ROUTER_PREF
578 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
579 #endif
580 if (strict & RT6_LOOKUP_F_REACHABLE) {
581 int n = rt6_check_neigh(rt);
582 if (n < 0)
583 return n;
584 }
585 return m;
586 }
587
588 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
589 int *mpri, struct rt6_info *match,
590 bool *do_rr)
591 {
592 int m;
593 bool match_do_rr = false;
594
595 if (rt6_check_expired(rt))
596 goto out;
597
598 m = rt6_score_route(rt, oif, strict);
599 if (m == RT6_NUD_FAIL_SOFT && !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF)) {
600 match_do_rr = true;
601 m = 0; /* lowest valid score */
602 } else if (m < 0) {
603 goto out;
604 }
605
606 if (strict & RT6_LOOKUP_F_REACHABLE)
607 rt6_probe(rt);
608
609 if (m > *mpri) {
610 *do_rr = match_do_rr;
611 *mpri = m;
612 match = rt;
613 }
614 out:
615 return match;
616 }
617
618 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
619 struct rt6_info *rr_head,
620 u32 metric, int oif, int strict,
621 bool *do_rr)
622 {
623 struct rt6_info *rt, *match;
624 int mpri = -1;
625
626 match = NULL;
627 for (rt = rr_head; rt && rt->rt6i_metric == metric;
628 rt = rt->dst.rt6_next)
629 match = find_match(rt, oif, strict, &mpri, match, do_rr);
630 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
631 rt = rt->dst.rt6_next)
632 match = find_match(rt, oif, strict, &mpri, match, do_rr);
633
634 return match;
635 }
636
637 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
638 {
639 struct rt6_info *match, *rt0;
640 struct net *net;
641 bool do_rr = false;
642
643 rt0 = fn->rr_ptr;
644 if (!rt0)
645 fn->rr_ptr = rt0 = fn->leaf;
646
647 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
648 &do_rr);
649
650 if (do_rr) {
651 struct rt6_info *next = rt0->dst.rt6_next;
652
653 /* no entries matched; do round-robin */
654 if (!next || next->rt6i_metric != rt0->rt6i_metric)
655 next = fn->leaf;
656
657 if (next != rt0)
658 fn->rr_ptr = next;
659 }
660
661 net = dev_net(rt0->dst.dev);
662 return match ? match : net->ipv6.ip6_null_entry;
663 }
664
665 #ifdef CONFIG_IPV6_ROUTE_INFO
666 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
667 const struct in6_addr *gwaddr)
668 {
669 struct net *net = dev_net(dev);
670 struct route_info *rinfo = (struct route_info *) opt;
671 struct in6_addr prefix_buf, *prefix;
672 unsigned int pref;
673 unsigned long lifetime;
674 struct rt6_info *rt;
675
676 if (len < sizeof(struct route_info)) {
677 return -EINVAL;
678 }
679
680 /* Sanity check for prefix_len and length */
681 if (rinfo->length > 3) {
682 return -EINVAL;
683 } else if (rinfo->prefix_len > 128) {
684 return -EINVAL;
685 } else if (rinfo->prefix_len > 64) {
686 if (rinfo->length < 2) {
687 return -EINVAL;
688 }
689 } else if (rinfo->prefix_len > 0) {
690 if (rinfo->length < 1) {
691 return -EINVAL;
692 }
693 }
694
695 pref = rinfo->route_pref;
696 if (pref == ICMPV6_ROUTER_PREF_INVALID)
697 return -EINVAL;
698
699 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
700
701 if (rinfo->length == 3)
702 prefix = (struct in6_addr *)rinfo->prefix;
703 else {
704 /* this function is safe */
705 ipv6_addr_prefix(&prefix_buf,
706 (struct in6_addr *)rinfo->prefix,
707 rinfo->prefix_len);
708 prefix = &prefix_buf;
709 }
710
711 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
712 dev->ifindex);
713
714 if (rt && !lifetime) {
715 ip6_del_rt(rt);
716 rt = NULL;
717 }
718
719 if (!rt && lifetime)
720 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
721 pref);
722 else if (rt)
723 rt->rt6i_flags = RTF_ROUTEINFO |
724 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
725
726 if (rt) {
727 if (!addrconf_finite_timeout(lifetime))
728 rt6_clean_expires(rt);
729 else
730 rt6_set_expires(rt, jiffies + HZ * lifetime);
731
732 ip6_rt_put(rt);
733 }
734 return 0;
735 }
736 #endif
737
738 #define BACKTRACK(__net, saddr) \
739 do { \
740 if (rt == __net->ipv6.ip6_null_entry) { \
741 struct fib6_node *pn; \
742 while (1) { \
743 if (fn->fn_flags & RTN_TL_ROOT) \
744 goto out; \
745 pn = fn->parent; \
746 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
747 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
748 else \
749 fn = pn; \
750 if (fn->fn_flags & RTN_RTINFO) \
751 goto restart; \
752 } \
753 } \
754 } while (0)
755
756 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
757 struct fib6_table *table,
758 struct flowi6 *fl6, int flags)
759 {
760 struct fib6_node *fn;
761 struct rt6_info *rt;
762
763 read_lock_bh(&table->tb6_lock);
764 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
765 restart:
766 rt = fn->leaf;
767 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
768 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
769 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
770 BACKTRACK(net, &fl6->saddr);
771 out:
772 dst_use(&rt->dst, jiffies);
773 read_unlock_bh(&table->tb6_lock);
774 return rt;
775
776 }
777
778 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
779 int flags)
780 {
781 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
782 }
783 EXPORT_SYMBOL_GPL(ip6_route_lookup);
784
785 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
786 const struct in6_addr *saddr, int oif, int strict)
787 {
788 struct flowi6 fl6 = {
789 .flowi6_oif = oif,
790 .daddr = *daddr,
791 };
792 struct dst_entry *dst;
793 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
794
795 if (saddr) {
796 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
797 flags |= RT6_LOOKUP_F_HAS_SADDR;
798 }
799
800 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
801 if (dst->error == 0)
802 return (struct rt6_info *) dst;
803
804 dst_release(dst);
805
806 return NULL;
807 }
808
809 EXPORT_SYMBOL(rt6_lookup);
810
811 /* ip6_ins_rt is called with FREE table->tb6_lock.
812 It takes new route entry, the addition fails by any reason the
813 route is freed. In any case, if caller does not hold it, it may
814 be destroyed.
815 */
816
817 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
818 {
819 int err;
820 struct fib6_table *table;
821
822 table = rt->rt6i_table;
823 write_lock_bh(&table->tb6_lock);
824 err = fib6_add(&table->tb6_root, rt, info);
825 write_unlock_bh(&table->tb6_lock);
826
827 return err;
828 }
829
830 int ip6_ins_rt(struct rt6_info *rt)
831 {
832 struct nl_info info = {
833 .nl_net = dev_net(rt->dst.dev),
834 };
835 return __ip6_ins_rt(rt, &info);
836 }
837
838 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
839 const struct in6_addr *daddr,
840 const struct in6_addr *saddr)
841 {
842 struct rt6_info *rt;
843
844 /*
845 * Clone the route.
846 */
847
848 rt = ip6_rt_copy(ort, daddr);
849
850 if (rt) {
851 if (!(rt->rt6i_flags & RTF_GATEWAY)) {
852 if (ort->rt6i_dst.plen != 128 &&
853 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
854 rt->rt6i_flags |= RTF_ANYCAST;
855 rt->rt6i_gateway = *daddr;
856 }
857
858 rt->rt6i_flags |= RTF_CACHE;
859
860 #ifdef CONFIG_IPV6_SUBTREES
861 if (rt->rt6i_src.plen && saddr) {
862 rt->rt6i_src.addr = *saddr;
863 rt->rt6i_src.plen = 128;
864 }
865 #endif
866 }
867
868 return rt;
869 }
870
871 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
872 const struct in6_addr *daddr)
873 {
874 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
875
876 if (rt)
877 rt->rt6i_flags |= RTF_CACHE;
878 return rt;
879 }
880
881 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
882 struct flowi6 *fl6, int flags)
883 {
884 struct fib6_node *fn;
885 struct rt6_info *rt, *nrt;
886 int strict = 0;
887 int attempts = 3;
888 int err;
889 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
890
891 strict |= flags & RT6_LOOKUP_F_IFACE;
892
893 relookup:
894 read_lock_bh(&table->tb6_lock);
895
896 restart_2:
897 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
898
899 restart:
900 rt = rt6_select(fn, oif, strict | reachable);
901 if (rt->rt6i_nsiblings)
902 rt = rt6_multipath_select(rt, fl6, oif, strict | reachable);
903 BACKTRACK(net, &fl6->saddr);
904 if (rt == net->ipv6.ip6_null_entry ||
905 rt->rt6i_flags & RTF_CACHE)
906 goto out;
907
908 dst_hold(&rt->dst);
909 read_unlock_bh(&table->tb6_lock);
910
911 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
912 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
913 else if (!(rt->dst.flags & DST_HOST))
914 nrt = rt6_alloc_clone(rt, &fl6->daddr);
915 else
916 goto out2;
917
918 ip6_rt_put(rt);
919 rt = nrt ? : net->ipv6.ip6_null_entry;
920
921 dst_hold(&rt->dst);
922 if (nrt) {
923 err = ip6_ins_rt(nrt);
924 if (!err)
925 goto out2;
926 }
927
928 if (--attempts <= 0)
929 goto out2;
930
931 /*
932 * Race condition! In the gap, when table->tb6_lock was
933 * released someone could insert this route. Relookup.
934 */
935 ip6_rt_put(rt);
936 goto relookup;
937
938 out:
939 if (reachable) {
940 reachable = 0;
941 goto restart_2;
942 }
943 dst_hold(&rt->dst);
944 read_unlock_bh(&table->tb6_lock);
945 out2:
946 rt->dst.lastuse = jiffies;
947 rt->dst.__use++;
948
949 return rt;
950 }
951
952 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
953 struct flowi6 *fl6, int flags)
954 {
955 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
956 }
957
958 static struct dst_entry *ip6_route_input_lookup(struct net *net,
959 struct net_device *dev,
960 struct flowi6 *fl6, int flags)
961 {
962 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
963 flags |= RT6_LOOKUP_F_IFACE;
964
965 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
966 }
967
968 void ip6_route_input(struct sk_buff *skb)
969 {
970 const struct ipv6hdr *iph = ipv6_hdr(skb);
971 struct net *net = dev_net(skb->dev);
972 int flags = RT6_LOOKUP_F_HAS_SADDR;
973 struct flowi6 fl6 = {
974 .flowi6_iif = skb->dev->ifindex,
975 .daddr = iph->daddr,
976 .saddr = iph->saddr,
977 .flowlabel = ip6_flowinfo(iph),
978 .flowi6_mark = skb->mark,
979 .flowi6_proto = iph->nexthdr,
980 };
981
982 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
983 }
984
985 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
986 struct flowi6 *fl6, int flags)
987 {
988 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
989 }
990
991 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
992 struct flowi6 *fl6)
993 {
994 int flags = 0;
995
996 fl6->flowi6_iif = LOOPBACK_IFINDEX;
997
998 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
999 flags |= RT6_LOOKUP_F_IFACE;
1000
1001 if (!ipv6_addr_any(&fl6->saddr))
1002 flags |= RT6_LOOKUP_F_HAS_SADDR;
1003 else if (sk)
1004 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1005
1006 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1007 }
1008
1009 EXPORT_SYMBOL(ip6_route_output);
1010
1011 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1012 {
1013 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1014 struct dst_entry *new = NULL;
1015
1016 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1017 if (rt) {
1018 new = &rt->dst;
1019
1020 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1021 rt6_init_peer(rt, net->ipv6.peers);
1022
1023 new->__use = 1;
1024 new->input = dst_discard;
1025 new->output = dst_discard;
1026
1027 if (dst_metrics_read_only(&ort->dst))
1028 new->_metrics = ort->dst._metrics;
1029 else
1030 dst_copy_metrics(new, &ort->dst);
1031 rt->rt6i_idev = ort->rt6i_idev;
1032 if (rt->rt6i_idev)
1033 in6_dev_hold(rt->rt6i_idev);
1034
1035 rt->rt6i_gateway = ort->rt6i_gateway;
1036 rt->rt6i_flags = ort->rt6i_flags;
1037 rt->rt6i_metric = 0;
1038
1039 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1040 #ifdef CONFIG_IPV6_SUBTREES
1041 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1042 #endif
1043
1044 dst_free(new);
1045 }
1046
1047 dst_release(dst_orig);
1048 return new ? new : ERR_PTR(-ENOMEM);
1049 }
1050
1051 /*
1052 * Destination cache support functions
1053 */
1054
1055 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1056 {
1057 struct rt6_info *rt;
1058
1059 rt = (struct rt6_info *) dst;
1060
1061 /* All IPV6 dsts are created with ->obsolete set to the value
1062 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1063 * into this function always.
1064 */
1065 if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev)))
1066 return NULL;
1067
1068 if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
1069 return dst;
1070
1071 return NULL;
1072 }
1073
1074 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1075 {
1076 struct rt6_info *rt = (struct rt6_info *) dst;
1077
1078 if (rt) {
1079 if (rt->rt6i_flags & RTF_CACHE) {
1080 if (rt6_check_expired(rt)) {
1081 ip6_del_rt(rt);
1082 dst = NULL;
1083 }
1084 } else {
1085 dst_release(dst);
1086 dst = NULL;
1087 }
1088 }
1089 return dst;
1090 }
1091
1092 static void ip6_link_failure(struct sk_buff *skb)
1093 {
1094 struct rt6_info *rt;
1095
1096 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1097
1098 rt = (struct rt6_info *) skb_dst(skb);
1099 if (rt) {
1100 if (rt->rt6i_flags & RTF_CACHE) {
1101 dst_hold(&rt->dst);
1102 if (ip6_del_rt(rt))
1103 dst_free(&rt->dst);
1104 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1105 rt->rt6i_node->fn_sernum = -1;
1106 }
1107 }
1108 }
1109
1110 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1111 struct sk_buff *skb, u32 mtu)
1112 {
1113 struct rt6_info *rt6 = (struct rt6_info*)dst;
1114
1115 dst_confirm(dst);
1116 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1117 struct net *net = dev_net(dst->dev);
1118
1119 rt6->rt6i_flags |= RTF_MODIFIED;
1120 if (mtu < IPV6_MIN_MTU) {
1121 u32 features = dst_metric(dst, RTAX_FEATURES);
1122 mtu = IPV6_MIN_MTU;
1123 features |= RTAX_FEATURE_ALLFRAG;
1124 dst_metric_set(dst, RTAX_FEATURES, features);
1125 }
1126 dst_metric_set(dst, RTAX_MTU, mtu);
1127 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1128 }
1129 }
1130
1131 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1132 int oif, u32 mark)
1133 {
1134 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1135 struct dst_entry *dst;
1136 struct flowi6 fl6;
1137
1138 memset(&fl6, 0, sizeof(fl6));
1139 fl6.flowi6_oif = oif;
1140 fl6.flowi6_mark = mark;
1141 fl6.flowi6_flags = 0;
1142 fl6.daddr = iph->daddr;
1143 fl6.saddr = iph->saddr;
1144 fl6.flowlabel = ip6_flowinfo(iph);
1145
1146 dst = ip6_route_output(net, NULL, &fl6);
1147 if (!dst->error)
1148 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1149 dst_release(dst);
1150 }
1151 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1152
1153 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1154 {
1155 ip6_update_pmtu(skb, sock_net(sk), mtu,
1156 sk->sk_bound_dev_if, sk->sk_mark);
1157 }
1158 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1159
1160 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1161 {
1162 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1163 struct dst_entry *dst;
1164 struct flowi6 fl6;
1165
1166 memset(&fl6, 0, sizeof(fl6));
1167 fl6.flowi6_oif = oif;
1168 fl6.flowi6_mark = mark;
1169 fl6.flowi6_flags = 0;
1170 fl6.daddr = iph->daddr;
1171 fl6.saddr = iph->saddr;
1172 fl6.flowlabel = ip6_flowinfo(iph);
1173
1174 dst = ip6_route_output(net, NULL, &fl6);
1175 if (!dst->error)
1176 rt6_do_redirect(dst, NULL, skb);
1177 dst_release(dst);
1178 }
1179 EXPORT_SYMBOL_GPL(ip6_redirect);
1180
1181 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1182 {
1183 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1184 }
1185 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1186
1187 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1188 {
1189 struct net_device *dev = dst->dev;
1190 unsigned int mtu = dst_mtu(dst);
1191 struct net *net = dev_net(dev);
1192
1193 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1194
1195 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1196 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1197
1198 /*
1199 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1200 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1201 * IPV6_MAXPLEN is also valid and means: "any MSS,
1202 * rely only on pmtu discovery"
1203 */
1204 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1205 mtu = IPV6_MAXPLEN;
1206 return mtu;
1207 }
1208
1209 static unsigned int ip6_mtu(const struct dst_entry *dst)
1210 {
1211 struct inet6_dev *idev;
1212 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1213
1214 if (mtu)
1215 return mtu;
1216
1217 mtu = IPV6_MIN_MTU;
1218
1219 rcu_read_lock();
1220 idev = __in6_dev_get(dst->dev);
1221 if (idev)
1222 mtu = idev->cnf.mtu6;
1223 rcu_read_unlock();
1224
1225 return mtu;
1226 }
1227
1228 static struct dst_entry *icmp6_dst_gc_list;
1229 static DEFINE_SPINLOCK(icmp6_dst_lock);
1230
1231 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1232 struct flowi6 *fl6)
1233 {
1234 struct dst_entry *dst;
1235 struct rt6_info *rt;
1236 struct inet6_dev *idev = in6_dev_get(dev);
1237 struct net *net = dev_net(dev);
1238
1239 if (unlikely(!idev))
1240 return ERR_PTR(-ENODEV);
1241
1242 rt = ip6_dst_alloc(net, dev, 0, NULL);
1243 if (unlikely(!rt)) {
1244 in6_dev_put(idev);
1245 dst = ERR_PTR(-ENOMEM);
1246 goto out;
1247 }
1248
1249 rt->dst.flags |= DST_HOST;
1250 rt->dst.output = ip6_output;
1251 atomic_set(&rt->dst.__refcnt, 1);
1252 rt->rt6i_dst.addr = fl6->daddr;
1253 rt->rt6i_dst.plen = 128;
1254 rt->rt6i_idev = idev;
1255 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1256
1257 spin_lock_bh(&icmp6_dst_lock);
1258 rt->dst.next = icmp6_dst_gc_list;
1259 icmp6_dst_gc_list = &rt->dst;
1260 spin_unlock_bh(&icmp6_dst_lock);
1261
1262 fib6_force_start_gc(net);
1263
1264 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1265
1266 out:
1267 return dst;
1268 }
1269
1270 int icmp6_dst_gc(void)
1271 {
1272 struct dst_entry *dst, **pprev;
1273 int more = 0;
1274
1275 spin_lock_bh(&icmp6_dst_lock);
1276 pprev = &icmp6_dst_gc_list;
1277
1278 while ((dst = *pprev) != NULL) {
1279 if (!atomic_read(&dst->__refcnt)) {
1280 *pprev = dst->next;
1281 dst_free(dst);
1282 } else {
1283 pprev = &dst->next;
1284 ++more;
1285 }
1286 }
1287
1288 spin_unlock_bh(&icmp6_dst_lock);
1289
1290 return more;
1291 }
1292
1293 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1294 void *arg)
1295 {
1296 struct dst_entry *dst, **pprev;
1297
1298 spin_lock_bh(&icmp6_dst_lock);
1299 pprev = &icmp6_dst_gc_list;
1300 while ((dst = *pprev) != NULL) {
1301 struct rt6_info *rt = (struct rt6_info *) dst;
1302 if (func(rt, arg)) {
1303 *pprev = dst->next;
1304 dst_free(dst);
1305 } else {
1306 pprev = &dst->next;
1307 }
1308 }
1309 spin_unlock_bh(&icmp6_dst_lock);
1310 }
1311
1312 static int ip6_dst_gc(struct dst_ops *ops)
1313 {
1314 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1315 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1316 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1317 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1318 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1319 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1320 int entries;
1321
1322 entries = dst_entries_get_fast(ops);
1323 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1324 entries <= rt_max_size)
1325 goto out;
1326
1327 net->ipv6.ip6_rt_gc_expire++;
1328 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size);
1329 entries = dst_entries_get_slow(ops);
1330 if (entries < ops->gc_thresh)
1331 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1332 out:
1333 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1334 return entries > rt_max_size;
1335 }
1336
1337 int ip6_dst_hoplimit(struct dst_entry *dst)
1338 {
1339 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
1340 if (hoplimit == 0) {
1341 struct net_device *dev = dst->dev;
1342 struct inet6_dev *idev;
1343
1344 rcu_read_lock();
1345 idev = __in6_dev_get(dev);
1346 if (idev)
1347 hoplimit = idev->cnf.hop_limit;
1348 else
1349 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
1350 rcu_read_unlock();
1351 }
1352 return hoplimit;
1353 }
1354 EXPORT_SYMBOL(ip6_dst_hoplimit);
1355
1356 /*
1357 *
1358 */
1359
1360 int ip6_route_add(struct fib6_config *cfg)
1361 {
1362 int err;
1363 struct net *net = cfg->fc_nlinfo.nl_net;
1364 struct rt6_info *rt = NULL;
1365 struct net_device *dev = NULL;
1366 struct inet6_dev *idev = NULL;
1367 struct fib6_table *table;
1368 int addr_type;
1369
1370 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1371 return -EINVAL;
1372 #ifndef CONFIG_IPV6_SUBTREES
1373 if (cfg->fc_src_len)
1374 return -EINVAL;
1375 #endif
1376 if (cfg->fc_ifindex) {
1377 err = -ENODEV;
1378 dev = dev_get_by_index(net, cfg->fc_ifindex);
1379 if (!dev)
1380 goto out;
1381 idev = in6_dev_get(dev);
1382 if (!idev)
1383 goto out;
1384 }
1385
1386 if (cfg->fc_metric == 0)
1387 cfg->fc_metric = IP6_RT_PRIO_USER;
1388
1389 err = -ENOBUFS;
1390 if (cfg->fc_nlinfo.nlh &&
1391 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1392 table = fib6_get_table(net, cfg->fc_table);
1393 if (!table) {
1394 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1395 table = fib6_new_table(net, cfg->fc_table);
1396 }
1397 } else {
1398 table = fib6_new_table(net, cfg->fc_table);
1399 }
1400
1401 if (!table)
1402 goto out;
1403
1404 rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table);
1405
1406 if (!rt) {
1407 err = -ENOMEM;
1408 goto out;
1409 }
1410
1411 if (cfg->fc_flags & RTF_EXPIRES)
1412 rt6_set_expires(rt, jiffies +
1413 clock_t_to_jiffies(cfg->fc_expires));
1414 else
1415 rt6_clean_expires(rt);
1416
1417 if (cfg->fc_protocol == RTPROT_UNSPEC)
1418 cfg->fc_protocol = RTPROT_BOOT;
1419 rt->rt6i_protocol = cfg->fc_protocol;
1420
1421 addr_type = ipv6_addr_type(&cfg->fc_dst);
1422
1423 if (addr_type & IPV6_ADDR_MULTICAST)
1424 rt->dst.input = ip6_mc_input;
1425 else if (cfg->fc_flags & RTF_LOCAL)
1426 rt->dst.input = ip6_input;
1427 else
1428 rt->dst.input = ip6_forward;
1429
1430 rt->dst.output = ip6_output;
1431
1432 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1433 rt->rt6i_dst.plen = cfg->fc_dst_len;
1434 if (rt->rt6i_dst.plen == 128)
1435 rt->dst.flags |= DST_HOST;
1436
1437 if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
1438 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1439 if (!metrics) {
1440 err = -ENOMEM;
1441 goto out;
1442 }
1443 dst_init_metrics(&rt->dst, metrics, 0);
1444 }
1445 #ifdef CONFIG_IPV6_SUBTREES
1446 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1447 rt->rt6i_src.plen = cfg->fc_src_len;
1448 #endif
1449
1450 rt->rt6i_metric = cfg->fc_metric;
1451
1452 /* We cannot add true routes via loopback here,
1453 they would result in kernel looping; promote them to reject routes
1454 */
1455 if ((cfg->fc_flags & RTF_REJECT) ||
1456 (dev && (dev->flags & IFF_LOOPBACK) &&
1457 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1458 !(cfg->fc_flags & RTF_LOCAL))) {
1459 /* hold loopback dev/idev if we haven't done so. */
1460 if (dev != net->loopback_dev) {
1461 if (dev) {
1462 dev_put(dev);
1463 in6_dev_put(idev);
1464 }
1465 dev = net->loopback_dev;
1466 dev_hold(dev);
1467 idev = in6_dev_get(dev);
1468 if (!idev) {
1469 err = -ENODEV;
1470 goto out;
1471 }
1472 }
1473 rt->dst.output = ip6_pkt_discard_out;
1474 rt->dst.input = ip6_pkt_discard;
1475 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1476 switch (cfg->fc_type) {
1477 case RTN_BLACKHOLE:
1478 rt->dst.error = -EINVAL;
1479 break;
1480 case RTN_PROHIBIT:
1481 rt->dst.error = -EACCES;
1482 break;
1483 case RTN_THROW:
1484 rt->dst.error = -EAGAIN;
1485 break;
1486 default:
1487 rt->dst.error = -ENETUNREACH;
1488 break;
1489 }
1490 goto install_route;
1491 }
1492
1493 if (cfg->fc_flags & RTF_GATEWAY) {
1494 const struct in6_addr *gw_addr;
1495 int gwa_type;
1496
1497 gw_addr = &cfg->fc_gateway;
1498 rt->rt6i_gateway = *gw_addr;
1499 gwa_type = ipv6_addr_type(gw_addr);
1500
1501 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1502 struct rt6_info *grt;
1503
1504 /* IPv6 strictly inhibits using not link-local
1505 addresses as nexthop address.
1506 Otherwise, router will not able to send redirects.
1507 It is very good, but in some (rare!) circumstances
1508 (SIT, PtP, NBMA NOARP links) it is handy to allow
1509 some exceptions. --ANK
1510 */
1511 err = -EINVAL;
1512 if (!(gwa_type & IPV6_ADDR_UNICAST))
1513 goto out;
1514
1515 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1516
1517 err = -EHOSTUNREACH;
1518 if (!grt)
1519 goto out;
1520 if (dev) {
1521 if (dev != grt->dst.dev) {
1522 ip6_rt_put(grt);
1523 goto out;
1524 }
1525 } else {
1526 dev = grt->dst.dev;
1527 idev = grt->rt6i_idev;
1528 dev_hold(dev);
1529 in6_dev_hold(grt->rt6i_idev);
1530 }
1531 if (!(grt->rt6i_flags & RTF_GATEWAY))
1532 err = 0;
1533 ip6_rt_put(grt);
1534
1535 if (err)
1536 goto out;
1537 }
1538 err = -EINVAL;
1539 if (!dev || (dev->flags & IFF_LOOPBACK))
1540 goto out;
1541 }
1542
1543 err = -ENODEV;
1544 if (!dev)
1545 goto out;
1546
1547 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1548 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1549 err = -EINVAL;
1550 goto out;
1551 }
1552 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1553 rt->rt6i_prefsrc.plen = 128;
1554 } else
1555 rt->rt6i_prefsrc.plen = 0;
1556
1557 rt->rt6i_flags = cfg->fc_flags;
1558
1559 install_route:
1560 if (cfg->fc_mx) {
1561 struct nlattr *nla;
1562 int remaining;
1563
1564 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1565 int type = nla_type(nla);
1566
1567 if (type) {
1568 if (type > RTAX_MAX) {
1569 err = -EINVAL;
1570 goto out;
1571 }
1572
1573 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1574 }
1575 }
1576 }
1577
1578 rt->dst.dev = dev;
1579 rt->rt6i_idev = idev;
1580 rt->rt6i_table = table;
1581
1582 cfg->fc_nlinfo.nl_net = dev_net(dev);
1583
1584 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1585
1586 out:
1587 if (dev)
1588 dev_put(dev);
1589 if (idev)
1590 in6_dev_put(idev);
1591 if (rt)
1592 dst_free(&rt->dst);
1593 return err;
1594 }
1595
1596 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1597 {
1598 int err;
1599 struct fib6_table *table;
1600 struct net *net = dev_net(rt->dst.dev);
1601
1602 if (rt == net->ipv6.ip6_null_entry) {
1603 err = -ENOENT;
1604 goto out;
1605 }
1606
1607 table = rt->rt6i_table;
1608 write_lock_bh(&table->tb6_lock);
1609 err = fib6_del(rt, info);
1610 write_unlock_bh(&table->tb6_lock);
1611
1612 out:
1613 ip6_rt_put(rt);
1614 return err;
1615 }
1616
1617 int ip6_del_rt(struct rt6_info *rt)
1618 {
1619 struct nl_info info = {
1620 .nl_net = dev_net(rt->dst.dev),
1621 };
1622 return __ip6_del_rt(rt, &info);
1623 }
1624
1625 static int ip6_route_del(struct fib6_config *cfg)
1626 {
1627 struct fib6_table *table;
1628 struct fib6_node *fn;
1629 struct rt6_info *rt;
1630 int err = -ESRCH;
1631
1632 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1633 if (!table)
1634 return err;
1635
1636 read_lock_bh(&table->tb6_lock);
1637
1638 fn = fib6_locate(&table->tb6_root,
1639 &cfg->fc_dst, cfg->fc_dst_len,
1640 &cfg->fc_src, cfg->fc_src_len);
1641
1642 if (fn) {
1643 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1644 if (cfg->fc_ifindex &&
1645 (!rt->dst.dev ||
1646 rt->dst.dev->ifindex != cfg->fc_ifindex))
1647 continue;
1648 if (cfg->fc_flags & RTF_GATEWAY &&
1649 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1650 continue;
1651 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1652 continue;
1653 dst_hold(&rt->dst);
1654 read_unlock_bh(&table->tb6_lock);
1655
1656 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1657 }
1658 }
1659 read_unlock_bh(&table->tb6_lock);
1660
1661 return err;
1662 }
1663
1664 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1665 {
1666 struct net *net = dev_net(skb->dev);
1667 struct netevent_redirect netevent;
1668 struct rt6_info *rt, *nrt = NULL;
1669 struct ndisc_options ndopts;
1670 struct inet6_dev *in6_dev;
1671 struct neighbour *neigh;
1672 struct rd_msg *msg;
1673 int optlen, on_link;
1674 u8 *lladdr;
1675
1676 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1677 optlen -= sizeof(*msg);
1678
1679 if (optlen < 0) {
1680 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1681 return;
1682 }
1683
1684 msg = (struct rd_msg *)icmp6_hdr(skb);
1685
1686 if (ipv6_addr_is_multicast(&msg->dest)) {
1687 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1688 return;
1689 }
1690
1691 on_link = 0;
1692 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1693 on_link = 1;
1694 } else if (ipv6_addr_type(&msg->target) !=
1695 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1696 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1697 return;
1698 }
1699
1700 in6_dev = __in6_dev_get(skb->dev);
1701 if (!in6_dev)
1702 return;
1703 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1704 return;
1705
1706 /* RFC2461 8.1:
1707 * The IP source address of the Redirect MUST be the same as the current
1708 * first-hop router for the specified ICMP Destination Address.
1709 */
1710
1711 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1712 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1713 return;
1714 }
1715
1716 lladdr = NULL;
1717 if (ndopts.nd_opts_tgt_lladdr) {
1718 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1719 skb->dev);
1720 if (!lladdr) {
1721 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1722 return;
1723 }
1724 }
1725
1726 rt = (struct rt6_info *) dst;
1727 if (rt == net->ipv6.ip6_null_entry) {
1728 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1729 return;
1730 }
1731
1732 /* Redirect received -> path was valid.
1733 * Look, redirects are sent only in response to data packets,
1734 * so that this nexthop apparently is reachable. --ANK
1735 */
1736 dst_confirm(&rt->dst);
1737
1738 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1739 if (!neigh)
1740 return;
1741
1742 /*
1743 * We have finally decided to accept it.
1744 */
1745
1746 neigh_update(neigh, lladdr, NUD_STALE,
1747 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1748 NEIGH_UPDATE_F_OVERRIDE|
1749 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1750 NEIGH_UPDATE_F_ISROUTER))
1751 );
1752
1753 nrt = ip6_rt_copy(rt, &msg->dest);
1754 if (!nrt)
1755 goto out;
1756
1757 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1758 if (on_link)
1759 nrt->rt6i_flags &= ~RTF_GATEWAY;
1760
1761 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1762
1763 if (ip6_ins_rt(nrt))
1764 goto out;
1765
1766 netevent.old = &rt->dst;
1767 netevent.new = &nrt->dst;
1768 netevent.daddr = &msg->dest;
1769 netevent.neigh = neigh;
1770 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1771
1772 if (rt->rt6i_flags & RTF_CACHE) {
1773 rt = (struct rt6_info *) dst_clone(&rt->dst);
1774 ip6_del_rt(rt);
1775 }
1776
1777 out:
1778 neigh_release(neigh);
1779 }
1780
1781 /*
1782 * Misc support functions
1783 */
1784
1785 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1786 const struct in6_addr *dest)
1787 {
1788 struct net *net = dev_net(ort->dst.dev);
1789 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1790 ort->rt6i_table);
1791
1792 if (rt) {
1793 rt->dst.input = ort->dst.input;
1794 rt->dst.output = ort->dst.output;
1795 rt->dst.flags |= DST_HOST;
1796
1797 rt->rt6i_dst.addr = *dest;
1798 rt->rt6i_dst.plen = 128;
1799 dst_copy_metrics(&rt->dst, &ort->dst);
1800 rt->dst.error = ort->dst.error;
1801 rt->rt6i_idev = ort->rt6i_idev;
1802 if (rt->rt6i_idev)
1803 in6_dev_hold(rt->rt6i_idev);
1804 rt->dst.lastuse = jiffies;
1805
1806 rt->rt6i_gateway = ort->rt6i_gateway;
1807 rt->rt6i_flags = ort->rt6i_flags;
1808 if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) ==
1809 (RTF_DEFAULT | RTF_ADDRCONF))
1810 rt6_set_from(rt, ort);
1811 rt->rt6i_metric = 0;
1812
1813 #ifdef CONFIG_IPV6_SUBTREES
1814 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1815 #endif
1816 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1817 rt->rt6i_table = ort->rt6i_table;
1818 }
1819 return rt;
1820 }
1821
1822 #ifdef CONFIG_IPV6_ROUTE_INFO
1823 static struct rt6_info *rt6_get_route_info(struct net *net,
1824 const struct in6_addr *prefix, int prefixlen,
1825 const struct in6_addr *gwaddr, int ifindex)
1826 {
1827 struct fib6_node *fn;
1828 struct rt6_info *rt = NULL;
1829 struct fib6_table *table;
1830
1831 table = fib6_get_table(net, RT6_TABLE_INFO);
1832 if (!table)
1833 return NULL;
1834
1835 read_lock_bh(&table->tb6_lock);
1836 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1837 if (!fn)
1838 goto out;
1839
1840 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1841 if (rt->dst.dev->ifindex != ifindex)
1842 continue;
1843 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1844 continue;
1845 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1846 continue;
1847 dst_hold(&rt->dst);
1848 break;
1849 }
1850 out:
1851 read_unlock_bh(&table->tb6_lock);
1852 return rt;
1853 }
1854
1855 static struct rt6_info *rt6_add_route_info(struct net *net,
1856 const struct in6_addr *prefix, int prefixlen,
1857 const struct in6_addr *gwaddr, int ifindex,
1858 unsigned int pref)
1859 {
1860 struct fib6_config cfg = {
1861 .fc_table = RT6_TABLE_INFO,
1862 .fc_metric = IP6_RT_PRIO_USER,
1863 .fc_ifindex = ifindex,
1864 .fc_dst_len = prefixlen,
1865 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1866 RTF_UP | RTF_PREF(pref),
1867 .fc_nlinfo.portid = 0,
1868 .fc_nlinfo.nlh = NULL,
1869 .fc_nlinfo.nl_net = net,
1870 };
1871
1872 cfg.fc_dst = *prefix;
1873 cfg.fc_gateway = *gwaddr;
1874
1875 /* We should treat it as a default route if prefix length is 0. */
1876 if (!prefixlen)
1877 cfg.fc_flags |= RTF_DEFAULT;
1878
1879 ip6_route_add(&cfg);
1880
1881 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1882 }
1883 #endif
1884
1885 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1886 {
1887 struct rt6_info *rt;
1888 struct fib6_table *table;
1889
1890 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1891 if (!table)
1892 return NULL;
1893
1894 read_lock_bh(&table->tb6_lock);
1895 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1896 if (dev == rt->dst.dev &&
1897 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1898 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1899 break;
1900 }
1901 if (rt)
1902 dst_hold(&rt->dst);
1903 read_unlock_bh(&table->tb6_lock);
1904 return rt;
1905 }
1906
1907 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1908 struct net_device *dev,
1909 unsigned int pref)
1910 {
1911 struct fib6_config cfg = {
1912 .fc_table = RT6_TABLE_DFLT,
1913 .fc_metric = IP6_RT_PRIO_USER,
1914 .fc_ifindex = dev->ifindex,
1915 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1916 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1917 .fc_nlinfo.portid = 0,
1918 .fc_nlinfo.nlh = NULL,
1919 .fc_nlinfo.nl_net = dev_net(dev),
1920 };
1921
1922 cfg.fc_gateway = *gwaddr;
1923
1924 ip6_route_add(&cfg);
1925
1926 return rt6_get_dflt_router(gwaddr, dev);
1927 }
1928
1929 void rt6_purge_dflt_routers(struct net *net)
1930 {
1931 struct rt6_info *rt;
1932 struct fib6_table *table;
1933
1934 /* NOTE: Keep consistent with rt6_get_dflt_router */
1935 table = fib6_get_table(net, RT6_TABLE_DFLT);
1936 if (!table)
1937 return;
1938
1939 restart:
1940 read_lock_bh(&table->tb6_lock);
1941 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
1942 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
1943 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
1944 dst_hold(&rt->dst);
1945 read_unlock_bh(&table->tb6_lock);
1946 ip6_del_rt(rt);
1947 goto restart;
1948 }
1949 }
1950 read_unlock_bh(&table->tb6_lock);
1951 }
1952
1953 static void rtmsg_to_fib6_config(struct net *net,
1954 struct in6_rtmsg *rtmsg,
1955 struct fib6_config *cfg)
1956 {
1957 memset(cfg, 0, sizeof(*cfg));
1958
1959 cfg->fc_table = RT6_TABLE_MAIN;
1960 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1961 cfg->fc_metric = rtmsg->rtmsg_metric;
1962 cfg->fc_expires = rtmsg->rtmsg_info;
1963 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1964 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1965 cfg->fc_flags = rtmsg->rtmsg_flags;
1966
1967 cfg->fc_nlinfo.nl_net = net;
1968
1969 cfg->fc_dst = rtmsg->rtmsg_dst;
1970 cfg->fc_src = rtmsg->rtmsg_src;
1971 cfg->fc_gateway = rtmsg->rtmsg_gateway;
1972 }
1973
1974 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1975 {
1976 struct fib6_config cfg;
1977 struct in6_rtmsg rtmsg;
1978 int err;
1979
1980 switch(cmd) {
1981 case SIOCADDRT: /* Add a route */
1982 case SIOCDELRT: /* Delete a route */
1983 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1984 return -EPERM;
1985 err = copy_from_user(&rtmsg, arg,
1986 sizeof(struct in6_rtmsg));
1987 if (err)
1988 return -EFAULT;
1989
1990 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
1991
1992 rtnl_lock();
1993 switch (cmd) {
1994 case SIOCADDRT:
1995 err = ip6_route_add(&cfg);
1996 break;
1997 case SIOCDELRT:
1998 err = ip6_route_del(&cfg);
1999 break;
2000 default:
2001 err = -EINVAL;
2002 }
2003 rtnl_unlock();
2004
2005 return err;
2006 }
2007
2008 return -EINVAL;
2009 }
2010
2011 /*
2012 * Drop the packet on the floor
2013 */
2014
2015 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2016 {
2017 int type;
2018 struct dst_entry *dst = skb_dst(skb);
2019 switch (ipstats_mib_noroutes) {
2020 case IPSTATS_MIB_INNOROUTES:
2021 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2022 if (type == IPV6_ADDR_ANY) {
2023 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2024 IPSTATS_MIB_INADDRERRORS);
2025 break;
2026 }
2027 /* FALLTHROUGH */
2028 case IPSTATS_MIB_OUTNOROUTES:
2029 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2030 ipstats_mib_noroutes);
2031 break;
2032 }
2033 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2034 kfree_skb(skb);
2035 return 0;
2036 }
2037
2038 static int ip6_pkt_discard(struct sk_buff *skb)
2039 {
2040 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2041 }
2042
2043 static int ip6_pkt_discard_out(struct sk_buff *skb)
2044 {
2045 skb->dev = skb_dst(skb)->dev;
2046 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2047 }
2048
2049 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2050
2051 static int ip6_pkt_prohibit(struct sk_buff *skb)
2052 {
2053 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2054 }
2055
2056 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2057 {
2058 skb->dev = skb_dst(skb)->dev;
2059 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2060 }
2061
2062 #endif
2063
2064 /*
2065 * Allocate a dst for local (unicast / anycast) address.
2066 */
2067
2068 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2069 const struct in6_addr *addr,
2070 bool anycast)
2071 {
2072 struct net *net = dev_net(idev->dev);
2073 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL);
2074
2075 if (!rt) {
2076 net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n");
2077 return ERR_PTR(-ENOMEM);
2078 }
2079
2080 in6_dev_hold(idev);
2081
2082 rt->dst.flags |= DST_HOST;
2083 rt->dst.input = ip6_input;
2084 rt->dst.output = ip6_output;
2085 rt->rt6i_idev = idev;
2086
2087 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2088 if (anycast)
2089 rt->rt6i_flags |= RTF_ANYCAST;
2090 else
2091 rt->rt6i_flags |= RTF_LOCAL;
2092
2093 rt->rt6i_dst.addr = *addr;
2094 rt->rt6i_dst.plen = 128;
2095 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2096
2097 atomic_set(&rt->dst.__refcnt, 1);
2098
2099 return rt;
2100 }
2101
2102 int ip6_route_get_saddr(struct net *net,
2103 struct rt6_info *rt,
2104 const struct in6_addr *daddr,
2105 unsigned int prefs,
2106 struct in6_addr *saddr)
2107 {
2108 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2109 int err = 0;
2110 if (rt->rt6i_prefsrc.plen)
2111 *saddr = rt->rt6i_prefsrc.addr;
2112 else
2113 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2114 daddr, prefs, saddr);
2115 return err;
2116 }
2117
2118 /* remove deleted ip from prefsrc entries */
2119 struct arg_dev_net_ip {
2120 struct net_device *dev;
2121 struct net *net;
2122 struct in6_addr *addr;
2123 };
2124
2125 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2126 {
2127 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2128 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2129 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2130
2131 if (((void *)rt->dst.dev == dev || !dev) &&
2132 rt != net->ipv6.ip6_null_entry &&
2133 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2134 /* remove prefsrc entry */
2135 rt->rt6i_prefsrc.plen = 0;
2136 }
2137 return 0;
2138 }
2139
2140 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2141 {
2142 struct net *net = dev_net(ifp->idev->dev);
2143 struct arg_dev_net_ip adni = {
2144 .dev = ifp->idev->dev,
2145 .net = net,
2146 .addr = &ifp->addr,
2147 };
2148 fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2149 }
2150
2151 struct arg_dev_net {
2152 struct net_device *dev;
2153 struct net *net;
2154 };
2155
2156 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2157 {
2158 const struct arg_dev_net *adn = arg;
2159 const struct net_device *dev = adn->dev;
2160
2161 if ((rt->dst.dev == dev || !dev) &&
2162 rt != adn->net->ipv6.ip6_null_entry)
2163 return -1;
2164
2165 return 0;
2166 }
2167
2168 void rt6_ifdown(struct net *net, struct net_device *dev)
2169 {
2170 struct arg_dev_net adn = {
2171 .dev = dev,
2172 .net = net,
2173 };
2174
2175 fib6_clean_all(net, fib6_ifdown, 0, &adn);
2176 icmp6_clean_all(fib6_ifdown, &adn);
2177 }
2178
2179 struct rt6_mtu_change_arg {
2180 struct net_device *dev;
2181 unsigned int mtu;
2182 };
2183
2184 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2185 {
2186 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2187 struct inet6_dev *idev;
2188
2189 /* In IPv6 pmtu discovery is not optional,
2190 so that RTAX_MTU lock cannot disable it.
2191 We still use this lock to block changes
2192 caused by addrconf/ndisc.
2193 */
2194
2195 idev = __in6_dev_get(arg->dev);
2196 if (!idev)
2197 return 0;
2198
2199 /* For administrative MTU increase, there is no way to discover
2200 IPv6 PMTU increase, so PMTU increase should be updated here.
2201 Since RFC 1981 doesn't include administrative MTU increase
2202 update PMTU increase is a MUST. (i.e. jumbo frame)
2203 */
2204 /*
2205 If new MTU is less than route PMTU, this new MTU will be the
2206 lowest MTU in the path, update the route PMTU to reflect PMTU
2207 decreases; if new MTU is greater than route PMTU, and the
2208 old MTU is the lowest MTU in the path, update the route PMTU
2209 to reflect the increase. In this case if the other nodes' MTU
2210 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2211 PMTU discouvery.
2212 */
2213 if (rt->dst.dev == arg->dev &&
2214 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2215 (dst_mtu(&rt->dst) >= arg->mtu ||
2216 (dst_mtu(&rt->dst) < arg->mtu &&
2217 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2218 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2219 }
2220 return 0;
2221 }
2222
2223 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2224 {
2225 struct rt6_mtu_change_arg arg = {
2226 .dev = dev,
2227 .mtu = mtu,
2228 };
2229
2230 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2231 }
2232
2233 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2234 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2235 [RTA_OIF] = { .type = NLA_U32 },
2236 [RTA_IIF] = { .type = NLA_U32 },
2237 [RTA_PRIORITY] = { .type = NLA_U32 },
2238 [RTA_METRICS] = { .type = NLA_NESTED },
2239 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2240 };
2241
2242 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2243 struct fib6_config *cfg)
2244 {
2245 struct rtmsg *rtm;
2246 struct nlattr *tb[RTA_MAX+1];
2247 int err;
2248
2249 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2250 if (err < 0)
2251 goto errout;
2252
2253 err = -EINVAL;
2254 rtm = nlmsg_data(nlh);
2255 memset(cfg, 0, sizeof(*cfg));
2256
2257 cfg->fc_table = rtm->rtm_table;
2258 cfg->fc_dst_len = rtm->rtm_dst_len;
2259 cfg->fc_src_len = rtm->rtm_src_len;
2260 cfg->fc_flags = RTF_UP;
2261 cfg->fc_protocol = rtm->rtm_protocol;
2262 cfg->fc_type = rtm->rtm_type;
2263
2264 if (rtm->rtm_type == RTN_UNREACHABLE ||
2265 rtm->rtm_type == RTN_BLACKHOLE ||
2266 rtm->rtm_type == RTN_PROHIBIT ||
2267 rtm->rtm_type == RTN_THROW)
2268 cfg->fc_flags |= RTF_REJECT;
2269
2270 if (rtm->rtm_type == RTN_LOCAL)
2271 cfg->fc_flags |= RTF_LOCAL;
2272
2273 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2274 cfg->fc_nlinfo.nlh = nlh;
2275 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2276
2277 if (tb[RTA_GATEWAY]) {
2278 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2279 cfg->fc_flags |= RTF_GATEWAY;
2280 }
2281
2282 if (tb[RTA_DST]) {
2283 int plen = (rtm->rtm_dst_len + 7) >> 3;
2284
2285 if (nla_len(tb[RTA_DST]) < plen)
2286 goto errout;
2287
2288 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2289 }
2290
2291 if (tb[RTA_SRC]) {
2292 int plen = (rtm->rtm_src_len + 7) >> 3;
2293
2294 if (nla_len(tb[RTA_SRC]) < plen)
2295 goto errout;
2296
2297 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2298 }
2299
2300 if (tb[RTA_PREFSRC])
2301 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2302
2303 if (tb[RTA_OIF])
2304 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2305
2306 if (tb[RTA_PRIORITY])
2307 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2308
2309 if (tb[RTA_METRICS]) {
2310 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2311 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2312 }
2313
2314 if (tb[RTA_TABLE])
2315 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2316
2317 if (tb[RTA_MULTIPATH]) {
2318 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2319 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2320 }
2321
2322 err = 0;
2323 errout:
2324 return err;
2325 }
2326
2327 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2328 {
2329 struct fib6_config r_cfg;
2330 struct rtnexthop *rtnh;
2331 int remaining;
2332 int attrlen;
2333 int err = 0, last_err = 0;
2334
2335 beginning:
2336 rtnh = (struct rtnexthop *)cfg->fc_mp;
2337 remaining = cfg->fc_mp_len;
2338
2339 /* Parse a Multipath Entry */
2340 while (rtnh_ok(rtnh, remaining)) {
2341 memcpy(&r_cfg, cfg, sizeof(*cfg));
2342 if (rtnh->rtnh_ifindex)
2343 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2344
2345 attrlen = rtnh_attrlen(rtnh);
2346 if (attrlen > 0) {
2347 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2348
2349 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2350 if (nla) {
2351 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2352 r_cfg.fc_flags |= RTF_GATEWAY;
2353 }
2354 }
2355 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2356 if (err) {
2357 last_err = err;
2358 /* If we are trying to remove a route, do not stop the
2359 * loop when ip6_route_del() fails (because next hop is
2360 * already gone), we should try to remove all next hops.
2361 */
2362 if (add) {
2363 /* If add fails, we should try to delete all
2364 * next hops that have been already added.
2365 */
2366 add = 0;
2367 goto beginning;
2368 }
2369 }
2370 /* Because each route is added like a single route we remove
2371 * this flag after the first nexthop (if there is a collision,
2372 * we have already fail to add the first nexthop:
2373 * fib6_add_rt2node() has reject it).
2374 */
2375 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2376 rtnh = rtnh_next(rtnh, &remaining);
2377 }
2378
2379 return last_err;
2380 }
2381
2382 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2383 {
2384 struct fib6_config cfg;
2385 int err;
2386
2387 err = rtm_to_fib6_config(skb, nlh, &cfg);
2388 if (err < 0)
2389 return err;
2390
2391 if (cfg.fc_mp)
2392 return ip6_route_multipath(&cfg, 0);
2393 else
2394 return ip6_route_del(&cfg);
2395 }
2396
2397 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2398 {
2399 struct fib6_config cfg;
2400 int err;
2401
2402 err = rtm_to_fib6_config(skb, nlh, &cfg);
2403 if (err < 0)
2404 return err;
2405
2406 if (cfg.fc_mp)
2407 return ip6_route_multipath(&cfg, 1);
2408 else
2409 return ip6_route_add(&cfg);
2410 }
2411
2412 static inline size_t rt6_nlmsg_size(void)
2413 {
2414 return NLMSG_ALIGN(sizeof(struct rtmsg))
2415 + nla_total_size(16) /* RTA_SRC */
2416 + nla_total_size(16) /* RTA_DST */
2417 + nla_total_size(16) /* RTA_GATEWAY */
2418 + nla_total_size(16) /* RTA_PREFSRC */
2419 + nla_total_size(4) /* RTA_TABLE */
2420 + nla_total_size(4) /* RTA_IIF */
2421 + nla_total_size(4) /* RTA_OIF */
2422 + nla_total_size(4) /* RTA_PRIORITY */
2423 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2424 + nla_total_size(sizeof(struct rta_cacheinfo));
2425 }
2426
2427 static int rt6_fill_node(struct net *net,
2428 struct sk_buff *skb, struct rt6_info *rt,
2429 struct in6_addr *dst, struct in6_addr *src,
2430 int iif, int type, u32 portid, u32 seq,
2431 int prefix, int nowait, unsigned int flags)
2432 {
2433 struct rtmsg *rtm;
2434 struct nlmsghdr *nlh;
2435 long expires;
2436 u32 table;
2437
2438 if (prefix) { /* user wants prefix routes only */
2439 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2440 /* success since this is not a prefix route */
2441 return 1;
2442 }
2443 }
2444
2445 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2446 if (!nlh)
2447 return -EMSGSIZE;
2448
2449 rtm = nlmsg_data(nlh);
2450 rtm->rtm_family = AF_INET6;
2451 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2452 rtm->rtm_src_len = rt->rt6i_src.plen;
2453 rtm->rtm_tos = 0;
2454 if (rt->rt6i_table)
2455 table = rt->rt6i_table->tb6_id;
2456 else
2457 table = RT6_TABLE_UNSPEC;
2458 rtm->rtm_table = table;
2459 if (nla_put_u32(skb, RTA_TABLE, table))
2460 goto nla_put_failure;
2461 if (rt->rt6i_flags & RTF_REJECT) {
2462 switch (rt->dst.error) {
2463 case -EINVAL:
2464 rtm->rtm_type = RTN_BLACKHOLE;
2465 break;
2466 case -EACCES:
2467 rtm->rtm_type = RTN_PROHIBIT;
2468 break;
2469 case -EAGAIN:
2470 rtm->rtm_type = RTN_THROW;
2471 break;
2472 default:
2473 rtm->rtm_type = RTN_UNREACHABLE;
2474 break;
2475 }
2476 }
2477 else if (rt->rt6i_flags & RTF_LOCAL)
2478 rtm->rtm_type = RTN_LOCAL;
2479 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2480 rtm->rtm_type = RTN_LOCAL;
2481 else
2482 rtm->rtm_type = RTN_UNICAST;
2483 rtm->rtm_flags = 0;
2484 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2485 rtm->rtm_protocol = rt->rt6i_protocol;
2486 if (rt->rt6i_flags & RTF_DYNAMIC)
2487 rtm->rtm_protocol = RTPROT_REDIRECT;
2488 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2489 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2490 rtm->rtm_protocol = RTPROT_RA;
2491 else
2492 rtm->rtm_protocol = RTPROT_KERNEL;
2493 }
2494
2495 if (rt->rt6i_flags & RTF_CACHE)
2496 rtm->rtm_flags |= RTM_F_CLONED;
2497
2498 if (dst) {
2499 if (nla_put(skb, RTA_DST, 16, dst))
2500 goto nla_put_failure;
2501 rtm->rtm_dst_len = 128;
2502 } else if (rtm->rtm_dst_len)
2503 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2504 goto nla_put_failure;
2505 #ifdef CONFIG_IPV6_SUBTREES
2506 if (src) {
2507 if (nla_put(skb, RTA_SRC, 16, src))
2508 goto nla_put_failure;
2509 rtm->rtm_src_len = 128;
2510 } else if (rtm->rtm_src_len &&
2511 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2512 goto nla_put_failure;
2513 #endif
2514 if (iif) {
2515 #ifdef CONFIG_IPV6_MROUTE
2516 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2517 int err = ip6mr_get_route(net, skb, rtm, nowait);
2518 if (err <= 0) {
2519 if (!nowait) {
2520 if (err == 0)
2521 return 0;
2522 goto nla_put_failure;
2523 } else {
2524 if (err == -EMSGSIZE)
2525 goto nla_put_failure;
2526 }
2527 }
2528 } else
2529 #endif
2530 if (nla_put_u32(skb, RTA_IIF, iif))
2531 goto nla_put_failure;
2532 } else if (dst) {
2533 struct in6_addr saddr_buf;
2534 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2535 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2536 goto nla_put_failure;
2537 }
2538
2539 if (rt->rt6i_prefsrc.plen) {
2540 struct in6_addr saddr_buf;
2541 saddr_buf = rt->rt6i_prefsrc.addr;
2542 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2543 goto nla_put_failure;
2544 }
2545
2546 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2547 goto nla_put_failure;
2548
2549 if (rt->rt6i_flags & RTF_GATEWAY) {
2550 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2551 goto nla_put_failure;
2552 }
2553
2554 if (rt->dst.dev &&
2555 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2556 goto nla_put_failure;
2557 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2558 goto nla_put_failure;
2559
2560 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2561
2562 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2563 goto nla_put_failure;
2564
2565 return nlmsg_end(skb, nlh);
2566
2567 nla_put_failure:
2568 nlmsg_cancel(skb, nlh);
2569 return -EMSGSIZE;
2570 }
2571
2572 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2573 {
2574 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2575 int prefix;
2576
2577 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2578 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2579 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2580 } else
2581 prefix = 0;
2582
2583 return rt6_fill_node(arg->net,
2584 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2585 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2586 prefix, 0, NLM_F_MULTI);
2587 }
2588
2589 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2590 {
2591 struct net *net = sock_net(in_skb->sk);
2592 struct nlattr *tb[RTA_MAX+1];
2593 struct rt6_info *rt;
2594 struct sk_buff *skb;
2595 struct rtmsg *rtm;
2596 struct flowi6 fl6;
2597 int err, iif = 0, oif = 0;
2598
2599 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2600 if (err < 0)
2601 goto errout;
2602
2603 err = -EINVAL;
2604 memset(&fl6, 0, sizeof(fl6));
2605
2606 if (tb[RTA_SRC]) {
2607 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2608 goto errout;
2609
2610 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2611 }
2612
2613 if (tb[RTA_DST]) {
2614 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2615 goto errout;
2616
2617 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2618 }
2619
2620 if (tb[RTA_IIF])
2621 iif = nla_get_u32(tb[RTA_IIF]);
2622
2623 if (tb[RTA_OIF])
2624 oif = nla_get_u32(tb[RTA_OIF]);
2625
2626 if (iif) {
2627 struct net_device *dev;
2628 int flags = 0;
2629
2630 dev = __dev_get_by_index(net, iif);
2631 if (!dev) {
2632 err = -ENODEV;
2633 goto errout;
2634 }
2635
2636 fl6.flowi6_iif = iif;
2637
2638 if (!ipv6_addr_any(&fl6.saddr))
2639 flags |= RT6_LOOKUP_F_HAS_SADDR;
2640
2641 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2642 flags);
2643 } else {
2644 fl6.flowi6_oif = oif;
2645
2646 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2647 }
2648
2649 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2650 if (!skb) {
2651 ip6_rt_put(rt);
2652 err = -ENOBUFS;
2653 goto errout;
2654 }
2655
2656 /* Reserve room for dummy headers, this skb can pass
2657 through good chunk of routing engine.
2658 */
2659 skb_reset_mac_header(skb);
2660 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2661
2662 skb_dst_set(skb, &rt->dst);
2663
2664 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2665 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2666 nlh->nlmsg_seq, 0, 0, 0);
2667 if (err < 0) {
2668 kfree_skb(skb);
2669 goto errout;
2670 }
2671
2672 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2673 errout:
2674 return err;
2675 }
2676
2677 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2678 {
2679 struct sk_buff *skb;
2680 struct net *net = info->nl_net;
2681 u32 seq;
2682 int err;
2683
2684 err = -ENOBUFS;
2685 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2686
2687 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2688 if (!skb)
2689 goto errout;
2690
2691 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2692 event, info->portid, seq, 0, 0, 0);
2693 if (err < 0) {
2694 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2695 WARN_ON(err == -EMSGSIZE);
2696 kfree_skb(skb);
2697 goto errout;
2698 }
2699 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2700 info->nlh, gfp_any());
2701 return;
2702 errout:
2703 if (err < 0)
2704 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2705 }
2706
2707 static int ip6_route_dev_notify(struct notifier_block *this,
2708 unsigned long event, void *ptr)
2709 {
2710 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2711 struct net *net = dev_net(dev);
2712
2713 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2714 net->ipv6.ip6_null_entry->dst.dev = dev;
2715 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2716 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2717 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2718 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2719 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2720 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2721 #endif
2722 }
2723
2724 return NOTIFY_OK;
2725 }
2726
2727 /*
2728 * /proc
2729 */
2730
2731 #ifdef CONFIG_PROC_FS
2732
2733 struct rt6_proc_arg
2734 {
2735 char *buffer;
2736 int offset;
2737 int length;
2738 int skip;
2739 int len;
2740 };
2741
2742 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2743 {
2744 struct seq_file *m = p_arg;
2745
2746 seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
2747
2748 #ifdef CONFIG_IPV6_SUBTREES
2749 seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
2750 #else
2751 seq_puts(m, "00000000000000000000000000000000 00 ");
2752 #endif
2753 if (rt->rt6i_flags & RTF_GATEWAY) {
2754 seq_printf(m, "%pi6", &rt->rt6i_gateway);
2755 } else {
2756 seq_puts(m, "00000000000000000000000000000000");
2757 }
2758 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2759 rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
2760 rt->dst.__use, rt->rt6i_flags,
2761 rt->dst.dev ? rt->dst.dev->name : "");
2762 return 0;
2763 }
2764
2765 static int ipv6_route_show(struct seq_file *m, void *v)
2766 {
2767 struct net *net = (struct net *)m->private;
2768 fib6_clean_all_ro(net, rt6_info_route, 0, m);
2769 return 0;
2770 }
2771
2772 static int ipv6_route_open(struct inode *inode, struct file *file)
2773 {
2774 return single_open_net(inode, file, ipv6_route_show);
2775 }
2776
2777 static const struct file_operations ipv6_route_proc_fops = {
2778 .owner = THIS_MODULE,
2779 .open = ipv6_route_open,
2780 .read = seq_read,
2781 .llseek = seq_lseek,
2782 .release = single_release_net,
2783 };
2784
2785 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2786 {
2787 struct net *net = (struct net *)seq->private;
2788 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2789 net->ipv6.rt6_stats->fib_nodes,
2790 net->ipv6.rt6_stats->fib_route_nodes,
2791 net->ipv6.rt6_stats->fib_rt_alloc,
2792 net->ipv6.rt6_stats->fib_rt_entries,
2793 net->ipv6.rt6_stats->fib_rt_cache,
2794 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2795 net->ipv6.rt6_stats->fib_discarded_routes);
2796
2797 return 0;
2798 }
2799
2800 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2801 {
2802 return single_open_net(inode, file, rt6_stats_seq_show);
2803 }
2804
2805 static const struct file_operations rt6_stats_seq_fops = {
2806 .owner = THIS_MODULE,
2807 .open = rt6_stats_seq_open,
2808 .read = seq_read,
2809 .llseek = seq_lseek,
2810 .release = single_release_net,
2811 };
2812 #endif /* CONFIG_PROC_FS */
2813
2814 #ifdef CONFIG_SYSCTL
2815
2816 static
2817 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
2818 void __user *buffer, size_t *lenp, loff_t *ppos)
2819 {
2820 struct net *net;
2821 int delay;
2822 if (!write)
2823 return -EINVAL;
2824
2825 net = (struct net *)ctl->extra1;
2826 delay = net->ipv6.sysctl.flush_delay;
2827 proc_dointvec(ctl, write, buffer, lenp, ppos);
2828 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
2829 return 0;
2830 }
2831
2832 struct ctl_table ipv6_route_table_template[] = {
2833 {
2834 .procname = "flush",
2835 .data = &init_net.ipv6.sysctl.flush_delay,
2836 .maxlen = sizeof(int),
2837 .mode = 0200,
2838 .proc_handler = ipv6_sysctl_rtcache_flush
2839 },
2840 {
2841 .procname = "gc_thresh",
2842 .data = &ip6_dst_ops_template.gc_thresh,
2843 .maxlen = sizeof(int),
2844 .mode = 0644,
2845 .proc_handler = proc_dointvec,
2846 },
2847 {
2848 .procname = "max_size",
2849 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2850 .maxlen = sizeof(int),
2851 .mode = 0644,
2852 .proc_handler = proc_dointvec,
2853 },
2854 {
2855 .procname = "gc_min_interval",
2856 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2857 .maxlen = sizeof(int),
2858 .mode = 0644,
2859 .proc_handler = proc_dointvec_jiffies,
2860 },
2861 {
2862 .procname = "gc_timeout",
2863 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2864 .maxlen = sizeof(int),
2865 .mode = 0644,
2866 .proc_handler = proc_dointvec_jiffies,
2867 },
2868 {
2869 .procname = "gc_interval",
2870 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2871 .maxlen = sizeof(int),
2872 .mode = 0644,
2873 .proc_handler = proc_dointvec_jiffies,
2874 },
2875 {
2876 .procname = "gc_elasticity",
2877 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2878 .maxlen = sizeof(int),
2879 .mode = 0644,
2880 .proc_handler = proc_dointvec,
2881 },
2882 {
2883 .procname = "mtu_expires",
2884 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2885 .maxlen = sizeof(int),
2886 .mode = 0644,
2887 .proc_handler = proc_dointvec_jiffies,
2888 },
2889 {
2890 .procname = "min_adv_mss",
2891 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2892 .maxlen = sizeof(int),
2893 .mode = 0644,
2894 .proc_handler = proc_dointvec,
2895 },
2896 {
2897 .procname = "gc_min_interval_ms",
2898 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2899 .maxlen = sizeof(int),
2900 .mode = 0644,
2901 .proc_handler = proc_dointvec_ms_jiffies,
2902 },
2903 { }
2904 };
2905
2906 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2907 {
2908 struct ctl_table *table;
2909
2910 table = kmemdup(ipv6_route_table_template,
2911 sizeof(ipv6_route_table_template),
2912 GFP_KERNEL);
2913
2914 if (table) {
2915 table[0].data = &net->ipv6.sysctl.flush_delay;
2916 table[0].extra1 = net;
2917 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2918 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2919 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2920 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2921 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2922 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2923 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2924 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2925 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2926
2927 /* Don't export sysctls to unprivileged users */
2928 if (net->user_ns != &init_user_ns)
2929 table[0].procname = NULL;
2930 }
2931
2932 return table;
2933 }
2934 #endif
2935
2936 static int __net_init ip6_route_net_init(struct net *net)
2937 {
2938 int ret = -ENOMEM;
2939
2940 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2941 sizeof(net->ipv6.ip6_dst_ops));
2942
2943 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2944 goto out_ip6_dst_ops;
2945
2946 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2947 sizeof(*net->ipv6.ip6_null_entry),
2948 GFP_KERNEL);
2949 if (!net->ipv6.ip6_null_entry)
2950 goto out_ip6_dst_entries;
2951 net->ipv6.ip6_null_entry->dst.path =
2952 (struct dst_entry *)net->ipv6.ip6_null_entry;
2953 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2954 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
2955 ip6_template_metrics, true);
2956
2957 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2958 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2959 sizeof(*net->ipv6.ip6_prohibit_entry),
2960 GFP_KERNEL);
2961 if (!net->ipv6.ip6_prohibit_entry)
2962 goto out_ip6_null_entry;
2963 net->ipv6.ip6_prohibit_entry->dst.path =
2964 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
2965 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2966 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
2967 ip6_template_metrics, true);
2968
2969 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
2970 sizeof(*net->ipv6.ip6_blk_hole_entry),
2971 GFP_KERNEL);
2972 if (!net->ipv6.ip6_blk_hole_entry)
2973 goto out_ip6_prohibit_entry;
2974 net->ipv6.ip6_blk_hole_entry->dst.path =
2975 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
2976 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2977 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
2978 ip6_template_metrics, true);
2979 #endif
2980
2981 net->ipv6.sysctl.flush_delay = 0;
2982 net->ipv6.sysctl.ip6_rt_max_size = 4096;
2983 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
2984 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
2985 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
2986 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
2987 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
2988 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
2989
2990 net->ipv6.ip6_rt_gc_expire = 30*HZ;
2991
2992 ret = 0;
2993 out:
2994 return ret;
2995
2996 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2997 out_ip6_prohibit_entry:
2998 kfree(net->ipv6.ip6_prohibit_entry);
2999 out_ip6_null_entry:
3000 kfree(net->ipv6.ip6_null_entry);
3001 #endif
3002 out_ip6_dst_entries:
3003 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3004 out_ip6_dst_ops:
3005 goto out;
3006 }
3007
3008 static void __net_exit ip6_route_net_exit(struct net *net)
3009 {
3010 kfree(net->ipv6.ip6_null_entry);
3011 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3012 kfree(net->ipv6.ip6_prohibit_entry);
3013 kfree(net->ipv6.ip6_blk_hole_entry);
3014 #endif
3015 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3016 }
3017
3018 static int __net_init ip6_route_net_init_late(struct net *net)
3019 {
3020 #ifdef CONFIG_PROC_FS
3021 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3022 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3023 #endif
3024 return 0;
3025 }
3026
3027 static void __net_exit ip6_route_net_exit_late(struct net *net)
3028 {
3029 #ifdef CONFIG_PROC_FS
3030 remove_proc_entry("ipv6_route", net->proc_net);
3031 remove_proc_entry("rt6_stats", net->proc_net);
3032 #endif
3033 }
3034
3035 static struct pernet_operations ip6_route_net_ops = {
3036 .init = ip6_route_net_init,
3037 .exit = ip6_route_net_exit,
3038 };
3039
3040 static int __net_init ipv6_inetpeer_init(struct net *net)
3041 {
3042 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3043
3044 if (!bp)
3045 return -ENOMEM;
3046 inet_peer_base_init(bp);
3047 net->ipv6.peers = bp;
3048 return 0;
3049 }
3050
3051 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3052 {
3053 struct inet_peer_base *bp = net->ipv6.peers;
3054
3055 net->ipv6.peers = NULL;
3056 inetpeer_invalidate_tree(bp);
3057 kfree(bp);
3058 }
3059
3060 static struct pernet_operations ipv6_inetpeer_ops = {
3061 .init = ipv6_inetpeer_init,
3062 .exit = ipv6_inetpeer_exit,
3063 };
3064
3065 static struct pernet_operations ip6_route_net_late_ops = {
3066 .init = ip6_route_net_init_late,
3067 .exit = ip6_route_net_exit_late,
3068 };
3069
3070 static struct notifier_block ip6_route_dev_notifier = {
3071 .notifier_call = ip6_route_dev_notify,
3072 .priority = 0,
3073 };
3074
3075 int __init ip6_route_init(void)
3076 {
3077 int ret;
3078
3079 ret = -ENOMEM;
3080 ip6_dst_ops_template.kmem_cachep =
3081 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3082 SLAB_HWCACHE_ALIGN, NULL);
3083 if (!ip6_dst_ops_template.kmem_cachep)
3084 goto out;
3085
3086 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3087 if (ret)
3088 goto out_kmem_cache;
3089
3090 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3091 if (ret)
3092 goto out_dst_entries;
3093
3094 ret = register_pernet_subsys(&ip6_route_net_ops);
3095 if (ret)
3096 goto out_register_inetpeer;
3097
3098 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3099
3100 /* Registering of the loopback is done before this portion of code,
3101 * the loopback reference in rt6_info will not be taken, do it
3102 * manually for init_net */
3103 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3104 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3105 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3106 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3107 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3108 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3109 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3110 #endif
3111 ret = fib6_init();
3112 if (ret)
3113 goto out_register_subsys;
3114
3115 ret = xfrm6_init();
3116 if (ret)
3117 goto out_fib6_init;
3118
3119 ret = fib6_rules_init();
3120 if (ret)
3121 goto xfrm6_init;
3122
3123 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3124 if (ret)
3125 goto fib6_rules_init;
3126
3127 ret = -ENOBUFS;
3128 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3129 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3130 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3131 goto out_register_late_subsys;
3132
3133 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3134 if (ret)
3135 goto out_register_late_subsys;
3136
3137 out:
3138 return ret;
3139
3140 out_register_late_subsys:
3141 unregister_pernet_subsys(&ip6_route_net_late_ops);
3142 fib6_rules_init:
3143 fib6_rules_cleanup();
3144 xfrm6_init:
3145 xfrm6_fini();
3146 out_fib6_init:
3147 fib6_gc_cleanup();
3148 out_register_subsys:
3149 unregister_pernet_subsys(&ip6_route_net_ops);
3150 out_register_inetpeer:
3151 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3152 out_dst_entries:
3153 dst_entries_destroy(&ip6_dst_blackhole_ops);
3154 out_kmem_cache:
3155 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3156 goto out;
3157 }
3158
3159 void ip6_route_cleanup(void)
3160 {
3161 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3162 unregister_pernet_subsys(&ip6_route_net_late_ops);
3163 fib6_rules_cleanup();
3164 xfrm6_fini();
3165 fib6_gc_cleanup();
3166 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3167 unregister_pernet_subsys(&ip6_route_net_ops);
3168 dst_entries_destroy(&ip6_dst_blackhole_ops);
3169 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3170 }
Linux kernel - Deliverables
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