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net: inet: Support UID-based routing in IP protocols.
[GitHub/LineageOS/android_kernel_samsung_universal7580.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 int ip6_pkt_prohibit(struct sk_buff *skb);
88 static int ip6_pkt_prohibit_out(struct sk_buff *skb);
89 static void ip6_link_failure(struct sk_buff *skb);
90 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
91 struct sk_buff *skb, u32 mtu);
92 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
93 struct sk_buff *skb);
94
95 #ifdef CONFIG_IPV6_ROUTE_INFO
96 static struct rt6_info *rt6_add_route_info(struct net_device *dev,
97 const struct in6_addr *prefix, int prefixlen,
98 const struct in6_addr *gwaddr, unsigned int pref);
99 static struct rt6_info *rt6_get_route_info(struct net_device *dev,
100 const struct in6_addr *prefix, int prefixlen,
101 const struct in6_addr *gwaddr);
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 dst_cow_metrics_generic(dst, old);
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 const struct rt6_info ip6_prohibit_entry_template = {
238 .dst = {
239 .__refcnt = ATOMIC_INIT(1),
240 .__use = 1,
241 .obsolete = DST_OBSOLETE_FORCE_CHK,
242 .error = -EACCES,
243 .input = ip6_pkt_prohibit,
244 .output = ip6_pkt_prohibit_out,
245 },
246 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
247 .rt6i_protocol = RTPROT_KERNEL,
248 .rt6i_metric = ~(u32) 0,
249 .rt6i_ref = ATOMIC_INIT(1),
250 };
251
252 static const struct rt6_info ip6_blk_hole_entry_template = {
253 .dst = {
254 .__refcnt = ATOMIC_INIT(1),
255 .__use = 1,
256 .obsolete = DST_OBSOLETE_FORCE_CHK,
257 .error = -EINVAL,
258 .input = dst_discard,
259 .output = dst_discard,
260 },
261 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
262 .rt6i_protocol = RTPROT_KERNEL,
263 .rt6i_metric = ~(u32) 0,
264 .rt6i_ref = ATOMIC_INIT(1),
265 };
266
267 #endif
268
269 /* allocate dst with ip6_dst_ops */
270 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
271 struct net_device *dev,
272 int flags,
273 struct fib6_table *table)
274 {
275 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
276 0, DST_OBSOLETE_FORCE_CHK, flags);
277
278 if (rt) {
279 struct dst_entry *dst = &rt->dst;
280
281 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
282 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
283 rt->rt6i_genid = rt_genid(net);
284 INIT_LIST_HEAD(&rt->rt6i_siblings);
285 rt->rt6i_nsiblings = 0;
286 }
287 return rt;
288 }
289
290 static void ip6_dst_destroy(struct dst_entry *dst)
291 {
292 struct rt6_info *rt = (struct rt6_info *)dst;
293 struct inet6_dev *idev = rt->rt6i_idev;
294 struct dst_entry *from = dst->from;
295
296 if (!(rt->dst.flags & DST_HOST))
297 dst_destroy_metrics_generic(dst);
298
299 if (idev) {
300 rt->rt6i_idev = NULL;
301 in6_dev_put(idev);
302 }
303
304 dst->from = NULL;
305 dst_release(from);
306
307 if (rt6_has_peer(rt)) {
308 struct inet_peer *peer = rt6_peer_ptr(rt);
309 inet_putpeer(peer);
310 }
311 }
312
313 void rt6_bind_peer(struct rt6_info *rt, int create)
314 {
315 struct inet_peer_base *base;
316 struct inet_peer *peer;
317
318 base = inetpeer_base_ptr(rt->_rt6i_peer);
319 if (!base)
320 return;
321
322 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
323 if (peer) {
324 if (!rt6_set_peer(rt, peer))
325 inet_putpeer(peer);
326 }
327 }
328
329 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
330 int how)
331 {
332 struct rt6_info *rt = (struct rt6_info *)dst;
333 struct inet6_dev *idev = rt->rt6i_idev;
334 struct net_device *loopback_dev =
335 dev_net(dev)->loopback_dev;
336
337 if (dev != loopback_dev) {
338 if (idev && idev->dev == dev) {
339 struct inet6_dev *loopback_idev =
340 in6_dev_get(loopback_dev);
341 if (loopback_idev) {
342 rt->rt6i_idev = loopback_idev;
343 in6_dev_put(idev);
344 }
345 }
346 }
347 }
348
349 static bool rt6_check_expired(const struct rt6_info *rt)
350 {
351 if (rt->rt6i_flags & RTF_EXPIRES) {
352 if (time_after(jiffies, rt->dst.expires))
353 return true;
354 } else if (rt->dst.from) {
355 return rt6_check_expired((struct rt6_info *) rt->dst.from);
356 }
357 return false;
358 }
359
360 static bool rt6_need_strict(const struct in6_addr *daddr)
361 {
362 return ipv6_addr_type(daddr) &
363 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
364 }
365
366 /* Multipath route selection:
367 * Hash based function using packet header and flowlabel.
368 * Adapted from fib_info_hashfn()
369 */
370 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
371 const struct flowi6 *fl6)
372 {
373 unsigned int val = fl6->flowi6_proto;
374
375 val ^= ipv6_addr_hash(&fl6->daddr);
376 val ^= ipv6_addr_hash(&fl6->saddr);
377
378 /* Work only if this not encapsulated */
379 switch (fl6->flowi6_proto) {
380 case IPPROTO_UDP:
381 case IPPROTO_TCP:
382 case IPPROTO_SCTP:
383 val ^= (__force u16)fl6->fl6_sport;
384 val ^= (__force u16)fl6->fl6_dport;
385 break;
386
387 case IPPROTO_ICMPV6:
388 val ^= (__force u16)fl6->fl6_icmp_type;
389 val ^= (__force u16)fl6->fl6_icmp_code;
390 break;
391 }
392 /* RFC6438 recommands to use flowlabel */
393 val ^= (__force u32)fl6->flowlabel;
394
395 /* Perhaps, we need to tune, this function? */
396 val = val ^ (val >> 7) ^ (val >> 12);
397 return val % candidate_count;
398 }
399
400 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
401 struct flowi6 *fl6)
402 {
403 struct rt6_info *sibling, *next_sibling;
404 int route_choosen;
405
406 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
407 /* Don't change the route, if route_choosen == 0
408 * (siblings does not include ourself)
409 */
410 if (route_choosen)
411 list_for_each_entry_safe(sibling, next_sibling,
412 &match->rt6i_siblings, rt6i_siblings) {
413 route_choosen--;
414 if (route_choosen == 0) {
415 match = sibling;
416 break;
417 }
418 }
419 return match;
420 }
421
422 /*
423 * Route lookup. Any table->tb6_lock is implied.
424 */
425
426 static inline struct rt6_info *rt6_device_match(struct net *net,
427 struct rt6_info *rt,
428 const struct in6_addr *saddr,
429 int oif,
430 int flags)
431 {
432 struct rt6_info *local = NULL;
433 struct rt6_info *sprt;
434
435 if (!oif && ipv6_addr_any(saddr))
436 goto out;
437
438 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
439 struct net_device *dev = sprt->dst.dev;
440
441 if (oif) {
442 if (dev->ifindex == oif)
443 return sprt;
444 if (dev->flags & IFF_LOOPBACK) {
445 if (!sprt->rt6i_idev ||
446 sprt->rt6i_idev->dev->ifindex != oif) {
447 if (flags & RT6_LOOKUP_F_IFACE && oif)
448 continue;
449 if (local && (!oif ||
450 local->rt6i_idev->dev->ifindex == oif))
451 continue;
452 }
453 local = sprt;
454 }
455 } else {
456 if (ipv6_chk_addr(net, saddr, dev,
457 flags & RT6_LOOKUP_F_IFACE))
458 return sprt;
459 }
460 }
461
462 if (oif) {
463 if (local)
464 return local;
465
466 if (flags & RT6_LOOKUP_F_IFACE)
467 return net->ipv6.ip6_null_entry;
468 }
469 out:
470 return rt;
471 }
472
473 #ifdef CONFIG_IPV6_ROUTER_PREF
474 struct __rt6_probe_work {
475 struct work_struct work;
476 struct in6_addr target;
477 struct net_device *dev;
478 };
479
480 static void rt6_probe_deferred(struct work_struct *w)
481 {
482 struct in6_addr mcaddr;
483 struct __rt6_probe_work *work =
484 container_of(w, struct __rt6_probe_work, work);
485
486 addrconf_addr_solict_mult(&work->target, &mcaddr);
487 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
488 dev_put(work->dev);
489 kfree(w);
490 }
491
492 static void rt6_probe(struct rt6_info *rt)
493 {
494 struct neighbour *neigh;
495 /*
496 * Okay, this does not seem to be appropriate
497 * for now, however, we need to check if it
498 * is really so; aka Router Reachability Probing.
499 *
500 * Router Reachability Probe MUST be rate-limited
501 * to no more than one per minute.
502 */
503 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
504 return;
505 rcu_read_lock_bh();
506 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
507 if (neigh) {
508 write_lock(&neigh->lock);
509 if (neigh->nud_state & NUD_VALID)
510 goto out;
511 }
512
513 if (!neigh ||
514 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
515 struct __rt6_probe_work *work;
516
517 work = kmalloc(sizeof(*work), GFP_ATOMIC);
518
519 if (neigh && work)
520 neigh->updated = jiffies;
521
522 if (neigh)
523 write_unlock(&neigh->lock);
524
525 if (work) {
526 INIT_WORK(&work->work, rt6_probe_deferred);
527 work->target = rt->rt6i_gateway;
528 dev_hold(rt->dst.dev);
529 work->dev = rt->dst.dev;
530 schedule_work(&work->work);
531 }
532 } else {
533 out:
534 write_unlock(&neigh->lock);
535 }
536 rcu_read_unlock_bh();
537 }
538 #else
539 static inline void rt6_probe(struct rt6_info *rt)
540 {
541 }
542 #endif
543
544 /*
545 * Default Router Selection (RFC 2461 6.3.6)
546 */
547 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
548 {
549 struct net_device *dev = rt->dst.dev;
550 if (!oif || dev->ifindex == oif)
551 return 2;
552 if ((dev->flags & IFF_LOOPBACK) &&
553 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
554 return 1;
555 return 0;
556 }
557
558 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
559 {
560 struct neighbour *neigh;
561 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
562
563 if (rt->rt6i_flags & RTF_NONEXTHOP ||
564 !(rt->rt6i_flags & RTF_GATEWAY))
565 return RT6_NUD_SUCCEED;
566
567 rcu_read_lock_bh();
568 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
569 if (neigh) {
570 read_lock(&neigh->lock);
571 if (neigh->nud_state & NUD_VALID)
572 ret = RT6_NUD_SUCCEED;
573 #ifdef CONFIG_IPV6_ROUTER_PREF
574 else if (!(neigh->nud_state & NUD_FAILED))
575 ret = RT6_NUD_SUCCEED;
576 #endif
577 read_unlock(&neigh->lock);
578 } else {
579 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
580 RT6_NUD_SUCCEED : RT6_NUD_FAIL_SOFT;
581 }
582 rcu_read_unlock_bh();
583
584 return ret;
585 }
586
587 static int rt6_score_route(struct rt6_info *rt, int oif,
588 int strict)
589 {
590 int m;
591
592 m = rt6_check_dev(rt, oif);
593 if (!m && (strict & RT6_LOOKUP_F_IFACE))
594 return RT6_NUD_FAIL_HARD;
595 #ifdef CONFIG_IPV6_ROUTER_PREF
596 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
597 #endif
598 if (strict & RT6_LOOKUP_F_REACHABLE) {
599 int n = rt6_check_neigh(rt);
600 if (n < 0)
601 return n;
602 }
603 return m;
604 }
605
606 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
607 int *mpri, struct rt6_info *match,
608 bool *do_rr)
609 {
610 int m;
611 bool match_do_rr = false;
612
613 if (rt6_check_expired(rt))
614 goto out;
615
616 m = rt6_score_route(rt, oif, strict);
617 if (m == RT6_NUD_FAIL_SOFT && !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF)) {
618 match_do_rr = true;
619 m = 0; /* lowest valid score */
620 } else if (m < 0) {
621 goto out;
622 }
623
624 if (strict & RT6_LOOKUP_F_REACHABLE)
625 rt6_probe(rt);
626
627 if (m > *mpri) {
628 *do_rr = match_do_rr;
629 *mpri = m;
630 match = rt;
631 }
632 out:
633 return match;
634 }
635
636 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
637 struct rt6_info *rr_head,
638 u32 metric, int oif, int strict,
639 bool *do_rr)
640 {
641 struct rt6_info *rt, *match;
642 int mpri = -1;
643
644 match = NULL;
645 for (rt = rr_head; rt && rt->rt6i_metric == metric;
646 rt = rt->dst.rt6_next)
647 match = find_match(rt, oif, strict, &mpri, match, do_rr);
648 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
649 rt = rt->dst.rt6_next)
650 match = find_match(rt, oif, strict, &mpri, match, do_rr);
651
652 return match;
653 }
654
655 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
656 {
657 struct rt6_info *match, *rt0;
658 struct net *net;
659 bool do_rr = false;
660
661 rt0 = fn->rr_ptr;
662 if (!rt0)
663 fn->rr_ptr = rt0 = fn->leaf;
664
665 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
666 &do_rr);
667
668 if (do_rr) {
669 struct rt6_info *next = rt0->dst.rt6_next;
670
671 /* no entries matched; do round-robin */
672 if (!next || next->rt6i_metric != rt0->rt6i_metric)
673 next = fn->leaf;
674
675 if (next != rt0)
676 fn->rr_ptr = next;
677 }
678
679 net = dev_net(rt0->dst.dev);
680 return match ? match : net->ipv6.ip6_null_entry;
681 }
682
683 #ifdef CONFIG_IPV6_ROUTE_INFO
684 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
685 const struct in6_addr *gwaddr)
686 {
687 struct route_info *rinfo = (struct route_info *) opt;
688 struct in6_addr prefix_buf, *prefix;
689 unsigned int pref;
690 unsigned long lifetime;
691 struct rt6_info *rt;
692
693 if (len < sizeof(struct route_info)) {
694 return -EINVAL;
695 }
696
697 /* Sanity check for prefix_len and length */
698 if (rinfo->length > 3) {
699 return -EINVAL;
700 } else if (rinfo->prefix_len > 128) {
701 return -EINVAL;
702 } else if (rinfo->prefix_len > 64) {
703 if (rinfo->length < 2) {
704 return -EINVAL;
705 }
706 } else if (rinfo->prefix_len > 0) {
707 if (rinfo->length < 1) {
708 return -EINVAL;
709 }
710 }
711
712 pref = rinfo->route_pref;
713 if (pref == ICMPV6_ROUTER_PREF_INVALID)
714 return -EINVAL;
715
716 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
717
718 if (rinfo->length == 3)
719 prefix = (struct in6_addr *)rinfo->prefix;
720 else {
721 /* this function is safe */
722 ipv6_addr_prefix(&prefix_buf,
723 (struct in6_addr *)rinfo->prefix,
724 rinfo->prefix_len);
725 prefix = &prefix_buf;
726 }
727
728 rt = rt6_get_route_info(dev, prefix, rinfo->prefix_len, gwaddr);
729
730 if (rt && !lifetime) {
731 ip6_del_rt(rt);
732 rt = NULL;
733 }
734
735 if (!rt && lifetime)
736 rt = rt6_add_route_info(dev, prefix, rinfo->prefix_len, gwaddr, pref);
737 else if (rt)
738 rt->rt6i_flags = RTF_ROUTEINFO |
739 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
740
741 if (rt) {
742 if (!addrconf_finite_timeout(lifetime))
743 rt6_clean_expires(rt);
744 else
745 rt6_set_expires(rt, jiffies + HZ * lifetime);
746
747 ip6_rt_put(rt);
748 }
749 return 0;
750 }
751 #endif
752
753 #define BACKTRACK(__net, saddr) \
754 do { \
755 if (rt == __net->ipv6.ip6_null_entry) { \
756 struct fib6_node *pn; \
757 while (1) { \
758 if (fn->fn_flags & RTN_TL_ROOT) \
759 goto out; \
760 pn = fn->parent; \
761 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
762 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
763 else \
764 fn = pn; \
765 if (fn->fn_flags & RTN_RTINFO) \
766 goto restart; \
767 } \
768 } \
769 } while (0)
770
771 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
772 struct fib6_table *table,
773 struct flowi6 *fl6, int flags)
774 {
775 struct fib6_node *fn;
776 struct rt6_info *rt;
777
778 read_lock_bh(&table->tb6_lock);
779 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
780 restart:
781 rt = fn->leaf;
782 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
783 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
784 rt = rt6_multipath_select(rt, fl6);
785 BACKTRACK(net, &fl6->saddr);
786 out:
787 dst_use(&rt->dst, jiffies);
788 read_unlock_bh(&table->tb6_lock);
789 return rt;
790
791 }
792
793 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
794 int flags)
795 {
796 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
797 }
798 EXPORT_SYMBOL_GPL(ip6_route_lookup);
799
800 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
801 const struct in6_addr *saddr, int oif, int strict)
802 {
803 struct flowi6 fl6 = {
804 .flowi6_oif = oif,
805 .daddr = *daddr,
806 };
807 struct dst_entry *dst;
808 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
809
810 if (saddr) {
811 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
812 flags |= RT6_LOOKUP_F_HAS_SADDR;
813 }
814
815 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
816 if (dst->error == 0)
817 return (struct rt6_info *) dst;
818
819 dst_release(dst);
820
821 return NULL;
822 }
823
824 EXPORT_SYMBOL(rt6_lookup);
825
826 /* ip6_ins_rt is called with FREE table->tb6_lock.
827 It takes new route entry, the addition fails by any reason the
828 route is freed. In any case, if caller does not hold it, it may
829 be destroyed.
830 */
831
832 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
833 {
834 int err;
835 struct fib6_table *table;
836
837 table = rt->rt6i_table;
838 write_lock_bh(&table->tb6_lock);
839 err = fib6_add(&table->tb6_root, rt, info);
840 write_unlock_bh(&table->tb6_lock);
841
842 return err;
843 }
844
845 int ip6_ins_rt(struct rt6_info *rt)
846 {
847 struct nl_info info = {
848 .nl_net = dev_net(rt->dst.dev),
849 };
850 return __ip6_ins_rt(rt, &info);
851 }
852
853 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
854 const struct in6_addr *daddr,
855 const struct in6_addr *saddr)
856 {
857 struct rt6_info *rt;
858
859 /*
860 * Clone the route.
861 */
862
863 rt = ip6_rt_copy(ort, daddr);
864
865 if (rt) {
866 if (!(rt->rt6i_flags & RTF_GATEWAY)) {
867 if (ort->rt6i_dst.plen != 128 &&
868 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
869 rt->rt6i_flags |= RTF_ANYCAST;
870 }
871
872 rt->rt6i_flags |= RTF_CACHE;
873
874 #ifdef CONFIG_IPV6_SUBTREES
875 if (rt->rt6i_src.plen && saddr) {
876 rt->rt6i_src.addr = *saddr;
877 rt->rt6i_src.plen = 128;
878 }
879 #endif
880 }
881
882 return rt;
883 }
884
885 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
886 const struct in6_addr *daddr)
887 {
888 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
889
890 if (rt)
891 rt->rt6i_flags |= RTF_CACHE;
892 return rt;
893 }
894
895 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
896 struct flowi6 *fl6, int flags)
897 {
898 struct fib6_node *fn;
899 struct rt6_info *rt, *nrt;
900 int strict = 0;
901 int attempts = 3;
902 int err;
903 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
904
905 strict |= flags & RT6_LOOKUP_F_IFACE;
906
907 relookup:
908 read_lock_bh(&table->tb6_lock);
909
910 restart_2:
911 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
912
913 restart:
914 rt = rt6_select(fn, oif, strict | reachable);
915 if (rt->rt6i_nsiblings && oif == 0)
916 rt = rt6_multipath_select(rt, fl6);
917 BACKTRACK(net, &fl6->saddr);
918 if (rt == net->ipv6.ip6_null_entry ||
919 rt->rt6i_flags & RTF_CACHE)
920 goto out;
921
922 dst_hold(&rt->dst);
923 read_unlock_bh(&table->tb6_lock);
924
925 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
926 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
927 else if (!(rt->dst.flags & DST_HOST))
928 nrt = rt6_alloc_clone(rt, &fl6->daddr);
929 else
930 goto out2;
931
932 ip6_rt_put(rt);
933 rt = nrt ? : net->ipv6.ip6_null_entry;
934
935 dst_hold(&rt->dst);
936 if (nrt) {
937 err = ip6_ins_rt(nrt);
938 if (!err)
939 goto out2;
940 }
941
942 if (--attempts <= 0)
943 goto out2;
944
945 /*
946 * Race condition! In the gap, when table->tb6_lock was
947 * released someone could insert this route. Relookup.
948 */
949 ip6_rt_put(rt);
950 goto relookup;
951
952 out:
953 if (reachable) {
954 reachable = 0;
955 goto restart_2;
956 }
957 dst_hold(&rt->dst);
958 read_unlock_bh(&table->tb6_lock);
959 out2:
960 rt->dst.lastuse = jiffies;
961 rt->dst.__use++;
962
963 return rt;
964 }
965
966 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
967 struct flowi6 *fl6, int flags)
968 {
969 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
970 }
971
972 static struct dst_entry *ip6_route_input_lookup(struct net *net,
973 struct net_device *dev,
974 struct flowi6 *fl6, int flags)
975 {
976 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
977 flags |= RT6_LOOKUP_F_IFACE;
978
979 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
980 }
981
982 void ip6_route_input(struct sk_buff *skb)
983 {
984 const struct ipv6hdr *iph = ipv6_hdr(skb);
985 struct net *net = dev_net(skb->dev);
986 int flags = RT6_LOOKUP_F_HAS_SADDR;
987 struct flowi6 fl6 = {
988 .flowi6_iif = skb->dev->ifindex,
989 .daddr = iph->daddr,
990 .saddr = iph->saddr,
991 .flowlabel = ip6_flowinfo(iph),
992 .flowi6_mark = skb->mark,
993 .flowi6_proto = iph->nexthdr,
994 };
995
996 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
997 }
998
999 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1000 struct flowi6 *fl6, int flags)
1001 {
1002 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1003 }
1004
1005 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
1006 struct flowi6 *fl6)
1007 {
1008 int flags = 0;
1009
1010 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1011
1012 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1013 flags |= RT6_LOOKUP_F_IFACE;
1014
1015 if (!ipv6_addr_any(&fl6->saddr))
1016 flags |= RT6_LOOKUP_F_HAS_SADDR;
1017 else if (sk)
1018 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1019
1020 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1021 }
1022
1023 EXPORT_SYMBOL(ip6_route_output);
1024
1025 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1026 {
1027 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1028 struct dst_entry *new = NULL;
1029
1030 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1031 if (rt) {
1032 new = &rt->dst;
1033
1034 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1035 rt6_init_peer(rt, net->ipv6.peers);
1036
1037 new->__use = 1;
1038 new->input = dst_discard;
1039 new->output = dst_discard;
1040
1041 if (dst_metrics_read_only(&ort->dst))
1042 new->_metrics = ort->dst._metrics;
1043 else
1044 dst_copy_metrics(new, &ort->dst);
1045 rt->rt6i_idev = ort->rt6i_idev;
1046 if (rt->rt6i_idev)
1047 in6_dev_hold(rt->rt6i_idev);
1048
1049 rt->rt6i_gateway = ort->rt6i_gateway;
1050 rt->rt6i_flags = ort->rt6i_flags;
1051 rt->rt6i_metric = 0;
1052
1053 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1054 #ifdef CONFIG_IPV6_SUBTREES
1055 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1056 #endif
1057
1058 dst_free(new);
1059 }
1060
1061 dst_release(dst_orig);
1062 return new ? new : ERR_PTR(-ENOMEM);
1063 }
1064
1065 /*
1066 * Destination cache support functions
1067 */
1068
1069 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1070 {
1071 struct rt6_info *rt;
1072
1073 rt = (struct rt6_info *) dst;
1074
1075 /* All IPV6 dsts are created with ->obsolete set to the value
1076 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1077 * into this function always.
1078 */
1079 if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev)))
1080 return NULL;
1081
1082 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1083 return NULL;
1084
1085 if (rt6_check_expired(rt))
1086 return NULL;
1087
1088 return dst;
1089 }
1090
1091 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1092 {
1093 struct rt6_info *rt = (struct rt6_info *) dst;
1094
1095 if (rt) {
1096 if (rt->rt6i_flags & RTF_CACHE) {
1097 if (rt6_check_expired(rt)) {
1098 ip6_del_rt(rt);
1099 dst = NULL;
1100 }
1101 } else {
1102 dst_release(dst);
1103 dst = NULL;
1104 }
1105 }
1106 return dst;
1107 }
1108
1109 static void ip6_link_failure(struct sk_buff *skb)
1110 {
1111 struct rt6_info *rt;
1112
1113 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1114
1115 rt = (struct rt6_info *) skb_dst(skb);
1116 if (rt) {
1117 if (rt->rt6i_flags & RTF_CACHE) {
1118 dst_hold(&rt->dst);
1119 if (ip6_del_rt(rt))
1120 dst_free(&rt->dst);
1121 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1122 rt->rt6i_node->fn_sernum = -1;
1123 }
1124 }
1125 }
1126
1127 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1128 struct sk_buff *skb, u32 mtu)
1129 {
1130 struct rt6_info *rt6 = (struct rt6_info*)dst;
1131
1132 dst_confirm(dst);
1133 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1134 struct net *net = dev_net(dst->dev);
1135
1136 rt6->rt6i_flags |= RTF_MODIFIED;
1137 if (mtu < IPV6_MIN_MTU)
1138 mtu = IPV6_MIN_MTU;
1139
1140 dst_metric_set(dst, RTAX_MTU, mtu);
1141 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1142 }
1143 }
1144
1145 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1146 int oif, u32 mark, kuid_t uid)
1147 {
1148 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1149 struct dst_entry *dst;
1150 struct flowi6 fl6;
1151
1152 memset(&fl6, 0, sizeof(fl6));
1153 fl6.flowi6_oif = oif;
1154 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1155 fl6.flowi6_flags = 0;
1156 fl6.daddr = iph->daddr;
1157 fl6.saddr = iph->saddr;
1158 fl6.flowlabel = ip6_flowinfo(iph);
1159 fl6.flowi6_uid = uid;
1160
1161 dst = ip6_route_output(net, NULL, &fl6);
1162 if (!dst->error)
1163 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1164 dst_release(dst);
1165 }
1166 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1167
1168 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1169 {
1170 ip6_update_pmtu(skb, sock_net(sk), mtu,
1171 sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid);
1172 }
1173 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1174
1175 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
1176 kuid_t uid)
1177 {
1178 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1179 struct dst_entry *dst;
1180 struct flowi6 fl6;
1181
1182 memset(&fl6, 0, sizeof(fl6));
1183 fl6.flowi6_oif = oif;
1184 fl6.flowi6_mark = mark;
1185 fl6.flowi6_flags = 0;
1186 fl6.daddr = iph->daddr;
1187 fl6.saddr = iph->saddr;
1188 fl6.flowlabel = ip6_flowinfo(iph);
1189 fl6.flowi6_uid = uid;
1190
1191 dst = ip6_route_output(net, NULL, &fl6);
1192 if (!dst->error)
1193 rt6_do_redirect(dst, NULL, skb);
1194 dst_release(dst);
1195 }
1196 EXPORT_SYMBOL_GPL(ip6_redirect);
1197
1198 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1199 {
1200 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
1201 sk->sk_uid);
1202 }
1203 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1204
1205 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1206 {
1207 struct net_device *dev = dst->dev;
1208 unsigned int mtu = dst_mtu(dst);
1209 struct net *net = dev_net(dev);
1210
1211 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1212
1213 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1214 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1215
1216 /*
1217 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1218 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1219 * IPV6_MAXPLEN is also valid and means: "any MSS,
1220 * rely only on pmtu discovery"
1221 */
1222 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1223 mtu = IPV6_MAXPLEN;
1224 return mtu;
1225 }
1226
1227 static unsigned int ip6_mtu(const struct dst_entry *dst)
1228 {
1229 struct inet6_dev *idev;
1230 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1231
1232 if (mtu)
1233 goto out;
1234
1235 mtu = IPV6_MIN_MTU;
1236
1237 rcu_read_lock();
1238 idev = __in6_dev_get(dst->dev);
1239 if (idev)
1240 mtu = idev->cnf.mtu6;
1241 rcu_read_unlock();
1242
1243 out:
1244 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1245 }
1246
1247 static struct dst_entry *icmp6_dst_gc_list;
1248 static DEFINE_SPINLOCK(icmp6_dst_lock);
1249
1250 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1251 struct flowi6 *fl6)
1252 {
1253 struct dst_entry *dst;
1254 struct rt6_info *rt;
1255 struct inet6_dev *idev = in6_dev_get(dev);
1256 struct net *net = dev_net(dev);
1257
1258 if (unlikely(!idev))
1259 return ERR_PTR(-ENODEV);
1260
1261 rt = ip6_dst_alloc(net, dev, 0, NULL);
1262 if (unlikely(!rt)) {
1263 in6_dev_put(idev);
1264 dst = ERR_PTR(-ENOMEM);
1265 goto out;
1266 }
1267
1268 rt->dst.flags |= DST_HOST;
1269 rt->dst.output = ip6_output;
1270 atomic_set(&rt->dst.__refcnt, 1);
1271 rt->rt6i_gateway = fl6->daddr;
1272 rt->rt6i_dst.addr = fl6->daddr;
1273 rt->rt6i_dst.plen = 128;
1274 rt->rt6i_idev = idev;
1275 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1276
1277 spin_lock_bh(&icmp6_dst_lock);
1278 rt->dst.next = icmp6_dst_gc_list;
1279 icmp6_dst_gc_list = &rt->dst;
1280 spin_unlock_bh(&icmp6_dst_lock);
1281
1282 fib6_force_start_gc(net);
1283
1284 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1285
1286 out:
1287 return dst;
1288 }
1289
1290 int icmp6_dst_gc(void)
1291 {
1292 struct dst_entry *dst, **pprev;
1293 int more = 0;
1294
1295 spin_lock_bh(&icmp6_dst_lock);
1296 pprev = &icmp6_dst_gc_list;
1297
1298 while ((dst = *pprev) != NULL) {
1299 if (!atomic_read(&dst->__refcnt)) {
1300 *pprev = dst->next;
1301 dst_free(dst);
1302 } else {
1303 pprev = &dst->next;
1304 ++more;
1305 }
1306 }
1307
1308 spin_unlock_bh(&icmp6_dst_lock);
1309
1310 return more;
1311 }
1312
1313 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1314 void *arg)
1315 {
1316 struct dst_entry *dst, **pprev;
1317
1318 spin_lock_bh(&icmp6_dst_lock);
1319 pprev = &icmp6_dst_gc_list;
1320 while ((dst = *pprev) != NULL) {
1321 struct rt6_info *rt = (struct rt6_info *) dst;
1322 if (func(rt, arg)) {
1323 *pprev = dst->next;
1324 dst_free(dst);
1325 } else {
1326 pprev = &dst->next;
1327 }
1328 }
1329 spin_unlock_bh(&icmp6_dst_lock);
1330 }
1331
1332 static int ip6_dst_gc(struct dst_ops *ops)
1333 {
1334 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1335 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1336 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1337 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1338 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1339 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1340 int entries;
1341
1342 entries = dst_entries_get_fast(ops);
1343 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1344 entries <= rt_max_size)
1345 goto out;
1346
1347 net->ipv6.ip6_rt_gc_expire++;
1348 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size);
1349 entries = dst_entries_get_slow(ops);
1350 if (entries < ops->gc_thresh)
1351 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1352 out:
1353 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1354 return entries > rt_max_size;
1355 }
1356
1357 int ip6_dst_hoplimit(struct dst_entry *dst)
1358 {
1359 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
1360 if (hoplimit == 0) {
1361 struct net_device *dev = dst->dev;
1362 struct inet6_dev *idev;
1363
1364 rcu_read_lock();
1365 idev = __in6_dev_get(dev);
1366 if (idev)
1367 hoplimit = idev->cnf.hop_limit;
1368 else
1369 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
1370 rcu_read_unlock();
1371 }
1372 return hoplimit;
1373 }
1374 EXPORT_SYMBOL(ip6_dst_hoplimit);
1375
1376 /*
1377 *
1378 */
1379
1380 int ip6_route_add(struct fib6_config *cfg)
1381 {
1382 int err;
1383 struct net *net = cfg->fc_nlinfo.nl_net;
1384 struct rt6_info *rt = NULL;
1385 struct net_device *dev = NULL;
1386 struct inet6_dev *idev = NULL;
1387 struct fib6_table *table;
1388 int addr_type;
1389
1390 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1391 return -EINVAL;
1392 #ifndef CONFIG_IPV6_SUBTREES
1393 if (cfg->fc_src_len)
1394 return -EINVAL;
1395 #endif
1396 if (cfg->fc_ifindex) {
1397 err = -ENODEV;
1398 dev = dev_get_by_index(net, cfg->fc_ifindex);
1399 if (!dev)
1400 goto out;
1401 idev = in6_dev_get(dev);
1402 if (!idev)
1403 goto out;
1404 }
1405
1406 if (cfg->fc_metric == 0)
1407 cfg->fc_metric = IP6_RT_PRIO_USER;
1408
1409 err = -ENOBUFS;
1410 if (cfg->fc_nlinfo.nlh &&
1411 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1412 table = fib6_get_table(net, cfg->fc_table);
1413 if (!table) {
1414 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1415 table = fib6_new_table(net, cfg->fc_table);
1416 }
1417 } else {
1418 table = fib6_new_table(net, cfg->fc_table);
1419 }
1420
1421 if (!table)
1422 goto out;
1423
1424 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1425
1426 if (!rt) {
1427 err = -ENOMEM;
1428 goto out;
1429 }
1430
1431 if (cfg->fc_flags & RTF_EXPIRES)
1432 rt6_set_expires(rt, jiffies +
1433 clock_t_to_jiffies(cfg->fc_expires));
1434 else
1435 rt6_clean_expires(rt);
1436
1437 if (cfg->fc_protocol == RTPROT_UNSPEC)
1438 cfg->fc_protocol = RTPROT_BOOT;
1439 rt->rt6i_protocol = cfg->fc_protocol;
1440
1441 addr_type = ipv6_addr_type(&cfg->fc_dst);
1442
1443 if (addr_type & IPV6_ADDR_MULTICAST)
1444 rt->dst.input = ip6_mc_input;
1445 else if (cfg->fc_flags & RTF_LOCAL)
1446 rt->dst.input = ip6_input;
1447 else
1448 rt->dst.input = ip6_forward;
1449
1450 rt->dst.output = ip6_output;
1451
1452 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1453 rt->rt6i_dst.plen = cfg->fc_dst_len;
1454 if (rt->rt6i_dst.plen == 128)
1455 rt->dst.flags |= DST_HOST;
1456
1457 if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
1458 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1459 if (!metrics) {
1460 err = -ENOMEM;
1461 goto out;
1462 }
1463 dst_init_metrics(&rt->dst, metrics, 0);
1464 }
1465 #ifdef CONFIG_IPV6_SUBTREES
1466 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1467 rt->rt6i_src.plen = cfg->fc_src_len;
1468 #endif
1469
1470 rt->rt6i_metric = cfg->fc_metric;
1471
1472 /* We cannot add true routes via loopback here,
1473 they would result in kernel looping; promote them to reject routes
1474 */
1475 if ((cfg->fc_flags & RTF_REJECT) ||
1476 (dev && (dev->flags & IFF_LOOPBACK) &&
1477 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1478 !(cfg->fc_flags & RTF_LOCAL))) {
1479 /* hold loopback dev/idev if we haven't done so. */
1480 if (dev != net->loopback_dev) {
1481 if (dev) {
1482 dev_put(dev);
1483 in6_dev_put(idev);
1484 }
1485 dev = net->loopback_dev;
1486 dev_hold(dev);
1487 idev = in6_dev_get(dev);
1488 if (!idev) {
1489 err = -ENODEV;
1490 goto out;
1491 }
1492 }
1493 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1494 switch (cfg->fc_type) {
1495 case RTN_BLACKHOLE:
1496 rt->dst.error = -EINVAL;
1497 rt->dst.output = dst_discard;
1498 rt->dst.input = dst_discard;
1499 break;
1500 case RTN_PROHIBIT:
1501 rt->dst.error = -EACCES;
1502 rt->dst.output = ip6_pkt_prohibit_out;
1503 rt->dst.input = ip6_pkt_prohibit;
1504 break;
1505 case RTN_THROW:
1506 default:
1507 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1508 : -ENETUNREACH;
1509 rt->dst.output = ip6_pkt_discard_out;
1510 rt->dst.input = ip6_pkt_discard;
1511 break;
1512 }
1513 goto install_route;
1514 }
1515
1516 if (cfg->fc_flags & RTF_GATEWAY) {
1517 const struct in6_addr *gw_addr;
1518 int gwa_type;
1519
1520 gw_addr = &cfg->fc_gateway;
1521 rt->rt6i_gateway = *gw_addr;
1522 gwa_type = ipv6_addr_type(gw_addr);
1523
1524 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1525 struct rt6_info *grt;
1526
1527 /* IPv6 strictly inhibits using not link-local
1528 addresses as nexthop address.
1529 Otherwise, router will not able to send redirects.
1530 It is very good, but in some (rare!) circumstances
1531 (SIT, PtP, NBMA NOARP links) it is handy to allow
1532 some exceptions. --ANK
1533 */
1534 err = -EINVAL;
1535 if (!(gwa_type & IPV6_ADDR_UNICAST))
1536 goto out;
1537
1538 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1539
1540 err = -EHOSTUNREACH;
1541 if (!grt)
1542 goto out;
1543 if (dev) {
1544 if (dev != grt->dst.dev) {
1545 ip6_rt_put(grt);
1546 goto out;
1547 }
1548 } else {
1549 dev = grt->dst.dev;
1550 idev = grt->rt6i_idev;
1551 dev_hold(dev);
1552 in6_dev_hold(grt->rt6i_idev);
1553 }
1554 if (!(grt->rt6i_flags & RTF_GATEWAY))
1555 err = 0;
1556 ip6_rt_put(grt);
1557
1558 if (err)
1559 goto out;
1560 }
1561 err = -EINVAL;
1562 if (!dev || (dev->flags & IFF_LOOPBACK))
1563 goto out;
1564 }
1565
1566 err = -ENODEV;
1567 if (!dev)
1568 goto out;
1569
1570 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1571 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1572 err = -EINVAL;
1573 goto out;
1574 }
1575 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1576 rt->rt6i_prefsrc.plen = 128;
1577 } else
1578 rt->rt6i_prefsrc.plen = 0;
1579
1580 rt->rt6i_flags = cfg->fc_flags;
1581
1582 install_route:
1583 if (cfg->fc_mx) {
1584 struct nlattr *nla;
1585 int remaining;
1586
1587 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1588 int type = nla_type(nla);
1589
1590 if (type) {
1591 if (type > RTAX_MAX) {
1592 err = -EINVAL;
1593 goto out;
1594 }
1595
1596 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1597 }
1598 }
1599 }
1600
1601 rt->dst.dev = dev;
1602 rt->rt6i_idev = idev;
1603 rt->rt6i_table = table;
1604
1605 cfg->fc_nlinfo.nl_net = dev_net(dev);
1606
1607 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1608
1609 out:
1610 if (dev)
1611 dev_put(dev);
1612 if (idev)
1613 in6_dev_put(idev);
1614 if (rt)
1615 dst_free(&rt->dst);
1616 return err;
1617 }
1618
1619 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1620 {
1621 int err;
1622 struct fib6_table *table;
1623 struct net *net = dev_net(rt->dst.dev);
1624
1625 if (rt == net->ipv6.ip6_null_entry) {
1626 err = -ENOENT;
1627 goto out;
1628 }
1629
1630 table = rt->rt6i_table;
1631 write_lock_bh(&table->tb6_lock);
1632 err = fib6_del(rt, info);
1633 write_unlock_bh(&table->tb6_lock);
1634
1635 out:
1636 ip6_rt_put(rt);
1637 return err;
1638 }
1639
1640 int ip6_del_rt(struct rt6_info *rt)
1641 {
1642 struct nl_info info = {
1643 .nl_net = dev_net(rt->dst.dev),
1644 };
1645 return __ip6_del_rt(rt, &info);
1646 }
1647
1648 static int ip6_route_del(struct fib6_config *cfg)
1649 {
1650 struct fib6_table *table;
1651 struct fib6_node *fn;
1652 struct rt6_info *rt;
1653 int err = -ESRCH;
1654
1655 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1656 if (!table)
1657 return err;
1658
1659 read_lock_bh(&table->tb6_lock);
1660
1661 fn = fib6_locate(&table->tb6_root,
1662 &cfg->fc_dst, cfg->fc_dst_len,
1663 &cfg->fc_src, cfg->fc_src_len);
1664
1665 if (fn) {
1666 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1667 if (cfg->fc_ifindex &&
1668 (!rt->dst.dev ||
1669 rt->dst.dev->ifindex != cfg->fc_ifindex))
1670 continue;
1671 if (cfg->fc_flags & RTF_GATEWAY &&
1672 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1673 continue;
1674 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1675 continue;
1676 if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol)
1677 continue;
1678 dst_hold(&rt->dst);
1679 read_unlock_bh(&table->tb6_lock);
1680
1681 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1682 }
1683 }
1684 read_unlock_bh(&table->tb6_lock);
1685
1686 return err;
1687 }
1688
1689 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1690 {
1691 struct net *net = dev_net(skb->dev);
1692 struct netevent_redirect netevent;
1693 struct rt6_info *rt, *nrt = NULL;
1694 struct ndisc_options ndopts;
1695 struct inet6_dev *in6_dev;
1696 struct neighbour *neigh;
1697 struct rd_msg *msg;
1698 int optlen, on_link;
1699 u8 *lladdr;
1700
1701 optlen = skb->tail - skb->transport_header;
1702 optlen -= sizeof(*msg);
1703
1704 if (optlen < 0) {
1705 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1706 return;
1707 }
1708
1709 msg = (struct rd_msg *)icmp6_hdr(skb);
1710
1711 if (ipv6_addr_is_multicast(&msg->dest)) {
1712 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1713 return;
1714 }
1715
1716 on_link = 0;
1717 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1718 on_link = 1;
1719 } else if (ipv6_addr_type(&msg->target) !=
1720 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1721 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1722 return;
1723 }
1724
1725 in6_dev = __in6_dev_get(skb->dev);
1726 if (!in6_dev)
1727 return;
1728 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1729 return;
1730
1731 /* RFC2461 8.1:
1732 * The IP source address of the Redirect MUST be the same as the current
1733 * first-hop router for the specified ICMP Destination Address.
1734 */
1735
1736 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1737 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1738 return;
1739 }
1740
1741 lladdr = NULL;
1742 if (ndopts.nd_opts_tgt_lladdr) {
1743 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1744 skb->dev);
1745 if (!lladdr) {
1746 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1747 return;
1748 }
1749 }
1750
1751 rt = (struct rt6_info *) dst;
1752 if (rt == net->ipv6.ip6_null_entry) {
1753 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1754 return;
1755 }
1756
1757 /* Redirect received -> path was valid.
1758 * Look, redirects are sent only in response to data packets,
1759 * so that this nexthop apparently is reachable. --ANK
1760 */
1761 dst_confirm(&rt->dst);
1762
1763 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1764 if (!neigh)
1765 return;
1766
1767 /*
1768 * We have finally decided to accept it.
1769 */
1770
1771 neigh_update(neigh, lladdr, NUD_STALE,
1772 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1773 NEIGH_UPDATE_F_OVERRIDE|
1774 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1775 NEIGH_UPDATE_F_ISROUTER))
1776 );
1777
1778 nrt = ip6_rt_copy(rt, &msg->dest);
1779 if (!nrt)
1780 goto out;
1781
1782 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1783 if (on_link)
1784 nrt->rt6i_flags &= ~RTF_GATEWAY;
1785
1786 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1787
1788 if (ip6_ins_rt(nrt))
1789 goto out;
1790
1791 netevent.old = &rt->dst;
1792 netevent.new = &nrt->dst;
1793 netevent.daddr = &msg->dest;
1794 netevent.neigh = neigh;
1795 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1796
1797 if (rt->rt6i_flags & RTF_CACHE) {
1798 rt = (struct rt6_info *) dst_clone(&rt->dst);
1799 ip6_del_rt(rt);
1800 }
1801
1802 out:
1803 neigh_release(neigh);
1804 }
1805
1806 /*
1807 * Misc support functions
1808 */
1809
1810 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1811 const struct in6_addr *dest)
1812 {
1813 struct net *net = dev_net(ort->dst.dev);
1814 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1815 ort->rt6i_table);
1816
1817 if (rt) {
1818 rt->dst.input = ort->dst.input;
1819 rt->dst.output = ort->dst.output;
1820 rt->dst.flags |= DST_HOST;
1821
1822 rt->rt6i_dst.addr = *dest;
1823 rt->rt6i_dst.plen = 128;
1824 dst_copy_metrics(&rt->dst, &ort->dst);
1825 rt->dst.error = ort->dst.error;
1826 rt->rt6i_idev = ort->rt6i_idev;
1827 if (rt->rt6i_idev)
1828 in6_dev_hold(rt->rt6i_idev);
1829 rt->dst.lastuse = jiffies;
1830
1831 if (ort->rt6i_flags & RTF_GATEWAY)
1832 rt->rt6i_gateway = ort->rt6i_gateway;
1833 else
1834 rt->rt6i_gateway = *dest;
1835 rt->rt6i_flags = ort->rt6i_flags;
1836 rt6_set_from(rt, ort);
1837 rt->rt6i_metric = 0;
1838
1839 #ifdef CONFIG_IPV6_SUBTREES
1840 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1841 #endif
1842 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1843 rt->rt6i_table = ort->rt6i_table;
1844 }
1845 return rt;
1846 }
1847
1848 #ifdef CONFIG_IPV6_ROUTE_INFO
1849 static struct rt6_info *rt6_get_route_info(struct net_device *dev,
1850 const struct in6_addr *prefix, int prefixlen,
1851 const struct in6_addr *gwaddr)
1852 {
1853 struct fib6_node *fn;
1854 struct rt6_info *rt = NULL;
1855 struct fib6_table *table;
1856
1857 table = fib6_get_table(dev_net(dev),
1858 addrconf_rt_table(dev, RT6_TABLE_INFO));
1859 if (!table)
1860 return NULL;
1861
1862 read_lock_bh(&table->tb6_lock);
1863 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1864 if (!fn)
1865 goto out;
1866
1867 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1868 if (rt->dst.dev->ifindex != dev->ifindex)
1869 continue;
1870 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1871 continue;
1872 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1873 continue;
1874 dst_hold(&rt->dst);
1875 break;
1876 }
1877 out:
1878 read_unlock_bh(&table->tb6_lock);
1879 return rt;
1880 }
1881
1882 static struct rt6_info *rt6_add_route_info(struct net_device *dev,
1883 const struct in6_addr *prefix, int prefixlen,
1884 const struct in6_addr *gwaddr, unsigned int pref)
1885 {
1886 struct fib6_config cfg = {
1887 .fc_table = addrconf_rt_table(dev, RT6_TABLE_INFO),
1888 .fc_metric = IP6_RT_PRIO_USER,
1889 .fc_ifindex = dev->ifindex,
1890 .fc_dst_len = prefixlen,
1891 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1892 RTF_UP | RTF_PREF(pref),
1893 .fc_nlinfo.portid = 0,
1894 .fc_nlinfo.nlh = NULL,
1895 .fc_nlinfo.nl_net = dev_net(dev),
1896 };
1897
1898 cfg.fc_dst = *prefix;
1899 cfg.fc_gateway = *gwaddr;
1900
1901 /* We should treat it as a default route if prefix length is 0. */
1902 if (!prefixlen)
1903 cfg.fc_flags |= RTF_DEFAULT;
1904
1905 ip6_route_add(&cfg);
1906
1907 return rt6_get_route_info(dev, prefix, prefixlen, gwaddr);
1908 }
1909 #endif
1910
1911 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1912 {
1913 struct rt6_info *rt;
1914 struct fib6_table *table;
1915
1916 table = fib6_get_table(dev_net(dev),
1917 addrconf_rt_table(dev, RT6_TABLE_MAIN));
1918 if (!table)
1919 return NULL;
1920
1921 read_lock_bh(&table->tb6_lock);
1922 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1923 if (dev == rt->dst.dev &&
1924 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1925 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1926 break;
1927 }
1928 if (rt)
1929 dst_hold(&rt->dst);
1930 read_unlock_bh(&table->tb6_lock);
1931 return rt;
1932 }
1933
1934 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1935 struct net_device *dev,
1936 unsigned int pref)
1937 {
1938 struct fib6_config cfg = {
1939 .fc_table = addrconf_rt_table(dev, RT6_TABLE_DFLT),
1940 .fc_metric = IP6_RT_PRIO_USER,
1941 .fc_ifindex = dev->ifindex,
1942 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1943 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1944 .fc_nlinfo.portid = 0,
1945 .fc_nlinfo.nlh = NULL,
1946 .fc_nlinfo.nl_net = dev_net(dev),
1947 };
1948
1949 cfg.fc_gateway = *gwaddr;
1950
1951 ip6_route_add(&cfg);
1952
1953 return rt6_get_dflt_router(gwaddr, dev);
1954 }
1955
1956
1957 int rt6_addrconf_purge(struct rt6_info *rt, void *arg) {
1958 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
1959 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2))
1960 return -1;
1961 return 0;
1962 }
1963
1964 void rt6_purge_dflt_routers(struct net *net)
1965 {
1966 fib6_clean_all(net, rt6_addrconf_purge, 0, NULL);
1967 }
1968
1969 static void rtmsg_to_fib6_config(struct net *net,
1970 struct in6_rtmsg *rtmsg,
1971 struct fib6_config *cfg)
1972 {
1973 memset(cfg, 0, sizeof(*cfg));
1974
1975 cfg->fc_table = RT6_TABLE_MAIN;
1976 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1977 cfg->fc_metric = rtmsg->rtmsg_metric;
1978 cfg->fc_expires = rtmsg->rtmsg_info;
1979 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1980 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1981 cfg->fc_flags = rtmsg->rtmsg_flags;
1982
1983 cfg->fc_nlinfo.nl_net = net;
1984
1985 cfg->fc_dst = rtmsg->rtmsg_dst;
1986 cfg->fc_src = rtmsg->rtmsg_src;
1987 cfg->fc_gateway = rtmsg->rtmsg_gateway;
1988 }
1989
1990 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1991 {
1992 struct fib6_config cfg;
1993 struct in6_rtmsg rtmsg;
1994 int err;
1995
1996 switch(cmd) {
1997 case SIOCADDRT: /* Add a route */
1998 case SIOCDELRT: /* Delete a route */
1999 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2000 return -EPERM;
2001 err = copy_from_user(&rtmsg, arg,
2002 sizeof(struct in6_rtmsg));
2003 if (err)
2004 return -EFAULT;
2005
2006 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2007
2008 rtnl_lock();
2009 switch (cmd) {
2010 case SIOCADDRT:
2011 err = ip6_route_add(&cfg);
2012 break;
2013 case SIOCDELRT:
2014 err = ip6_route_del(&cfg);
2015 break;
2016 default:
2017 err = -EINVAL;
2018 }
2019 rtnl_unlock();
2020
2021 return err;
2022 }
2023
2024 return -EINVAL;
2025 }
2026
2027 /*
2028 * Drop the packet on the floor
2029 */
2030
2031 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2032 {
2033 int type;
2034 struct dst_entry *dst = skb_dst(skb);
2035 switch (ipstats_mib_noroutes) {
2036 case IPSTATS_MIB_INNOROUTES:
2037 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2038 if (type == IPV6_ADDR_ANY) {
2039 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2040 IPSTATS_MIB_INADDRERRORS);
2041 break;
2042 }
2043 /* FALLTHROUGH */
2044 case IPSTATS_MIB_OUTNOROUTES:
2045 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2046 ipstats_mib_noroutes);
2047 break;
2048 }
2049 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2050 kfree_skb(skb);
2051 return 0;
2052 }
2053
2054 static int ip6_pkt_discard(struct sk_buff *skb)
2055 {
2056 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2057 }
2058
2059 static int ip6_pkt_discard_out(struct sk_buff *skb)
2060 {
2061 skb->dev = skb_dst(skb)->dev;
2062 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2063 }
2064
2065 static int ip6_pkt_prohibit(struct sk_buff *skb)
2066 {
2067 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2068 }
2069
2070 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2071 {
2072 skb->dev = skb_dst(skb)->dev;
2073 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2074 }
2075
2076 /*
2077 * Allocate a dst for local (unicast / anycast) address.
2078 */
2079
2080 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2081 const struct in6_addr *addr,
2082 bool anycast)
2083 {
2084 struct net *net = dev_net(idev->dev);
2085 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2086 DST_NOCOUNT, NULL);
2087 if (!rt)
2088 return ERR_PTR(-ENOMEM);
2089
2090 in6_dev_hold(idev);
2091
2092 rt->dst.flags |= DST_HOST;
2093 rt->dst.input = ip6_input;
2094 rt->dst.output = ip6_output;
2095 rt->rt6i_idev = idev;
2096
2097 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2098 if (anycast)
2099 rt->rt6i_flags |= RTF_ANYCAST;
2100 else
2101 rt->rt6i_flags |= RTF_LOCAL;
2102
2103 rt->rt6i_gateway = *addr;
2104 rt->rt6i_dst.addr = *addr;
2105 rt->rt6i_dst.plen = 128;
2106 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2107
2108 atomic_set(&rt->dst.__refcnt, 1);
2109
2110 return rt;
2111 }
2112
2113 int ip6_route_get_saddr(struct net *net,
2114 struct rt6_info *rt,
2115 const struct in6_addr *daddr,
2116 unsigned int prefs,
2117 struct in6_addr *saddr)
2118 {
2119 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2120 int err = 0;
2121 if (rt->rt6i_prefsrc.plen)
2122 *saddr = rt->rt6i_prefsrc.addr;
2123 else
2124 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2125 daddr, prefs, saddr);
2126 return err;
2127 }
2128
2129 /* remove deleted ip from prefsrc entries */
2130 struct arg_dev_net_ip {
2131 struct net_device *dev;
2132 struct net *net;
2133 struct in6_addr *addr;
2134 };
2135
2136 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2137 {
2138 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2139 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2140 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2141
2142 if (((void *)rt->dst.dev == dev || !dev) &&
2143 rt != net->ipv6.ip6_null_entry &&
2144 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2145 /* remove prefsrc entry */
2146 rt->rt6i_prefsrc.plen = 0;
2147 }
2148 return 0;
2149 }
2150
2151 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2152 {
2153 struct net *net = dev_net(ifp->idev->dev);
2154 struct arg_dev_net_ip adni = {
2155 .dev = ifp->idev->dev,
2156 .net = net,
2157 .addr = &ifp->addr,
2158 };
2159 fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2160 }
2161
2162 struct arg_dev_net {
2163 struct net_device *dev;
2164 struct net *net;
2165 };
2166
2167 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2168 {
2169 const struct arg_dev_net *adn = arg;
2170 const struct net_device *dev = adn->dev;
2171
2172 if ((rt->dst.dev == dev || !dev) &&
2173 rt != adn->net->ipv6.ip6_null_entry)
2174 return -1;
2175
2176 return 0;
2177 }
2178
2179 void rt6_ifdown(struct net *net, struct net_device *dev)
2180 {
2181 struct arg_dev_net adn = {
2182 .dev = dev,
2183 .net = net,
2184 };
2185
2186 fib6_clean_all(net, fib6_ifdown, 0, &adn);
2187 icmp6_clean_all(fib6_ifdown, &adn);
2188 }
2189
2190 struct rt6_mtu_change_arg {
2191 struct net_device *dev;
2192 unsigned int mtu;
2193 };
2194
2195 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2196 {
2197 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2198 struct inet6_dev *idev;
2199
2200 /* In IPv6 pmtu discovery is not optional,
2201 so that RTAX_MTU lock cannot disable it.
2202 We still use this lock to block changes
2203 caused by addrconf/ndisc.
2204 */
2205
2206 idev = __in6_dev_get(arg->dev);
2207 if (!idev)
2208 return 0;
2209
2210 /* For administrative MTU increase, there is no way to discover
2211 IPv6 PMTU increase, so PMTU increase should be updated here.
2212 Since RFC 1981 doesn't include administrative MTU increase
2213 update PMTU increase is a MUST. (i.e. jumbo frame)
2214 */
2215 /*
2216 If new MTU is less than route PMTU, this new MTU will be the
2217 lowest MTU in the path, update the route PMTU to reflect PMTU
2218 decreases; if new MTU is greater than route PMTU, and the
2219 old MTU is the lowest MTU in the path, update the route PMTU
2220 to reflect the increase. In this case if the other nodes' MTU
2221 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2222 PMTU discouvery.
2223 */
2224 if (rt->dst.dev == arg->dev &&
2225 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2226 (dst_mtu(&rt->dst) >= arg->mtu ||
2227 (dst_mtu(&rt->dst) < arg->mtu &&
2228 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2229 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2230 }
2231 return 0;
2232 }
2233
2234 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2235 {
2236 struct rt6_mtu_change_arg arg = {
2237 .dev = dev,
2238 .mtu = mtu,
2239 };
2240
2241 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2242 }
2243
2244 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2245 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2246 [RTA_OIF] = { .type = NLA_U32 },
2247 [RTA_IIF] = { .type = NLA_U32 },
2248 [RTA_PRIORITY] = { .type = NLA_U32 },
2249 [RTA_METRICS] = { .type = NLA_NESTED },
2250 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2251 [RTA_UID] = { .type = NLA_U32 },
2252 };
2253
2254 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2255 struct fib6_config *cfg)
2256 {
2257 struct rtmsg *rtm;
2258 struct nlattr *tb[RTA_MAX+1];
2259 int err;
2260
2261 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2262 if (err < 0)
2263 goto errout;
2264
2265 err = -EINVAL;
2266 rtm = nlmsg_data(nlh);
2267 memset(cfg, 0, sizeof(*cfg));
2268
2269 cfg->fc_table = rtm->rtm_table;
2270 cfg->fc_dst_len = rtm->rtm_dst_len;
2271 cfg->fc_src_len = rtm->rtm_src_len;
2272 cfg->fc_flags = RTF_UP;
2273 cfg->fc_protocol = rtm->rtm_protocol;
2274 cfg->fc_type = rtm->rtm_type;
2275
2276 if (rtm->rtm_type == RTN_UNREACHABLE ||
2277 rtm->rtm_type == RTN_BLACKHOLE ||
2278 rtm->rtm_type == RTN_PROHIBIT ||
2279 rtm->rtm_type == RTN_THROW)
2280 cfg->fc_flags |= RTF_REJECT;
2281
2282 if (rtm->rtm_type == RTN_LOCAL)
2283 cfg->fc_flags |= RTF_LOCAL;
2284
2285 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2286 cfg->fc_nlinfo.nlh = nlh;
2287 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2288
2289 if (tb[RTA_GATEWAY]) {
2290 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2291 cfg->fc_flags |= RTF_GATEWAY;
2292 }
2293
2294 if (tb[RTA_DST]) {
2295 int plen = (rtm->rtm_dst_len + 7) >> 3;
2296
2297 if (nla_len(tb[RTA_DST]) < plen)
2298 goto errout;
2299
2300 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2301 }
2302
2303 if (tb[RTA_SRC]) {
2304 int plen = (rtm->rtm_src_len + 7) >> 3;
2305
2306 if (nla_len(tb[RTA_SRC]) < plen)
2307 goto errout;
2308
2309 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2310 }
2311
2312 if (tb[RTA_PREFSRC])
2313 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2314
2315 if (tb[RTA_OIF])
2316 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2317
2318 if (tb[RTA_PRIORITY])
2319 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2320
2321 if (tb[RTA_METRICS]) {
2322 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2323 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2324 }
2325
2326 if (tb[RTA_TABLE])
2327 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2328
2329 if (tb[RTA_MULTIPATH]) {
2330 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2331 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2332 }
2333
2334 err = 0;
2335 errout:
2336 return err;
2337 }
2338
2339 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2340 {
2341 struct fib6_config r_cfg;
2342 struct rtnexthop *rtnh;
2343 int remaining;
2344 int attrlen;
2345 int err = 0, last_err = 0;
2346
2347 beginning:
2348 rtnh = (struct rtnexthop *)cfg->fc_mp;
2349 remaining = cfg->fc_mp_len;
2350
2351 /* Parse a Multipath Entry */
2352 while (rtnh_ok(rtnh, remaining)) {
2353 memcpy(&r_cfg, cfg, sizeof(*cfg));
2354 if (rtnh->rtnh_ifindex)
2355 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2356
2357 attrlen = rtnh_attrlen(rtnh);
2358 if (attrlen > 0) {
2359 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2360
2361 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2362 if (nla) {
2363 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2364 r_cfg.fc_flags |= RTF_GATEWAY;
2365 }
2366 }
2367 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2368 if (err) {
2369 last_err = err;
2370 /* If we are trying to remove a route, do not stop the
2371 * loop when ip6_route_del() fails (because next hop is
2372 * already gone), we should try to remove all next hops.
2373 */
2374 if (add) {
2375 /* If add fails, we should try to delete all
2376 * next hops that have been already added.
2377 */
2378 add = 0;
2379 goto beginning;
2380 }
2381 }
2382 /* Because each route is added like a single route we remove
2383 * this flag after the first nexthop (if there is a collision,
2384 * we have already fail to add the first nexthop:
2385 * fib6_add_rt2node() has reject it).
2386 */
2387 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2388 rtnh = rtnh_next(rtnh, &remaining);
2389 }
2390
2391 return last_err;
2392 }
2393
2394 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2395 {
2396 struct fib6_config cfg;
2397 int err;
2398
2399 err = rtm_to_fib6_config(skb, nlh, &cfg);
2400 if (err < 0)
2401 return err;
2402
2403 if (cfg.fc_mp)
2404 return ip6_route_multipath(&cfg, 0);
2405 else
2406 return ip6_route_del(&cfg);
2407 }
2408
2409 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2410 {
2411 struct fib6_config cfg;
2412 int err;
2413
2414 err = rtm_to_fib6_config(skb, nlh, &cfg);
2415 if (err < 0)
2416 return err;
2417
2418 if (cfg.fc_mp)
2419 return ip6_route_multipath(&cfg, 1);
2420 else
2421 return ip6_route_add(&cfg);
2422 }
2423
2424 static inline size_t rt6_nlmsg_size(void)
2425 {
2426 return NLMSG_ALIGN(sizeof(struct rtmsg))
2427 + nla_total_size(16) /* RTA_SRC */
2428 + nla_total_size(16) /* RTA_DST */
2429 + nla_total_size(16) /* RTA_GATEWAY */
2430 + nla_total_size(16) /* RTA_PREFSRC */
2431 + nla_total_size(4) /* RTA_TABLE */
2432 + nla_total_size(4) /* RTA_IIF */
2433 + nla_total_size(4) /* RTA_OIF */
2434 + nla_total_size(4) /* RTA_PRIORITY */
2435 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2436 + nla_total_size(sizeof(struct rta_cacheinfo));
2437 }
2438
2439 static int rt6_fill_node(struct net *net,
2440 struct sk_buff *skb, struct rt6_info *rt,
2441 struct in6_addr *dst, struct in6_addr *src,
2442 int iif, int type, u32 portid, u32 seq,
2443 int prefix, int nowait, unsigned int flags)
2444 {
2445 struct rtmsg *rtm;
2446 struct nlmsghdr *nlh;
2447 long expires;
2448 u32 table;
2449
2450 if (prefix) { /* user wants prefix routes only */
2451 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2452 /* success since this is not a prefix route */
2453 return 1;
2454 }
2455 }
2456
2457 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2458 if (!nlh)
2459 return -EMSGSIZE;
2460
2461 rtm = nlmsg_data(nlh);
2462 rtm->rtm_family = AF_INET6;
2463 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2464 rtm->rtm_src_len = rt->rt6i_src.plen;
2465 rtm->rtm_tos = 0;
2466 if (rt->rt6i_table)
2467 table = rt->rt6i_table->tb6_id;
2468 else
2469 table = RT6_TABLE_UNSPEC;
2470 rtm->rtm_table = table;
2471 if (nla_put_u32(skb, RTA_TABLE, table))
2472 goto nla_put_failure;
2473 if (rt->rt6i_flags & RTF_REJECT) {
2474 switch (rt->dst.error) {
2475 case -EINVAL:
2476 rtm->rtm_type = RTN_BLACKHOLE;
2477 break;
2478 case -EACCES:
2479 rtm->rtm_type = RTN_PROHIBIT;
2480 break;
2481 case -EAGAIN:
2482 rtm->rtm_type = RTN_THROW;
2483 break;
2484 default:
2485 rtm->rtm_type = RTN_UNREACHABLE;
2486 break;
2487 }
2488 }
2489 else if (rt->rt6i_flags & RTF_LOCAL)
2490 rtm->rtm_type = RTN_LOCAL;
2491 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2492 rtm->rtm_type = RTN_LOCAL;
2493 else
2494 rtm->rtm_type = RTN_UNICAST;
2495 rtm->rtm_flags = 0;
2496 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2497 rtm->rtm_protocol = rt->rt6i_protocol;
2498 if (rt->rt6i_flags & RTF_DYNAMIC)
2499 rtm->rtm_protocol = RTPROT_REDIRECT;
2500 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2501 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2502 rtm->rtm_protocol = RTPROT_RA;
2503 else
2504 rtm->rtm_protocol = RTPROT_KERNEL;
2505 }
2506
2507 if (rt->rt6i_flags & RTF_CACHE)
2508 rtm->rtm_flags |= RTM_F_CLONED;
2509
2510 if (dst) {
2511 if (nla_put(skb, RTA_DST, 16, dst))
2512 goto nla_put_failure;
2513 rtm->rtm_dst_len = 128;
2514 } else if (rtm->rtm_dst_len)
2515 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2516 goto nla_put_failure;
2517 #ifdef CONFIG_IPV6_SUBTREES
2518 if (src) {
2519 if (nla_put(skb, RTA_SRC, 16, src))
2520 goto nla_put_failure;
2521 rtm->rtm_src_len = 128;
2522 } else if (rtm->rtm_src_len &&
2523 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2524 goto nla_put_failure;
2525 #endif
2526 if (iif) {
2527 #ifdef CONFIG_IPV6_MROUTE
2528 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2529 int err = ip6mr_get_route(net, skb, rtm, nowait,
2530 portid);
2531
2532 if (err <= 0) {
2533 if (!nowait) {
2534 if (err == 0)
2535 return 0;
2536 goto nla_put_failure;
2537 } else {
2538 if (err == -EMSGSIZE)
2539 goto nla_put_failure;
2540 }
2541 }
2542 } else
2543 #endif
2544 if (nla_put_u32(skb, RTA_IIF, iif))
2545 goto nla_put_failure;
2546 } else if (dst) {
2547 struct in6_addr saddr_buf;
2548 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2549 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2550 goto nla_put_failure;
2551 }
2552
2553 if (rt->rt6i_prefsrc.plen) {
2554 struct in6_addr saddr_buf;
2555 saddr_buf = rt->rt6i_prefsrc.addr;
2556 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2557 goto nla_put_failure;
2558 }
2559
2560 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2561 goto nla_put_failure;
2562
2563 if (rt->rt6i_flags & RTF_GATEWAY) {
2564 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2565 goto nla_put_failure;
2566 }
2567
2568 if (rt->dst.dev &&
2569 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2570 goto nla_put_failure;
2571 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2572 goto nla_put_failure;
2573
2574 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2575
2576 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2577 goto nla_put_failure;
2578
2579 return nlmsg_end(skb, nlh);
2580
2581 nla_put_failure:
2582 nlmsg_cancel(skb, nlh);
2583 return -EMSGSIZE;
2584 }
2585
2586 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2587 {
2588 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2589 int prefix;
2590
2591 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2592 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2593 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2594 } else
2595 prefix = 0;
2596
2597 return rt6_fill_node(arg->net,
2598 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2599 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2600 prefix, 0, NLM_F_MULTI);
2601 }
2602
2603 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2604 {
2605 struct net *net = sock_net(in_skb->sk);
2606 struct nlattr *tb[RTA_MAX+1];
2607 struct rt6_info *rt;
2608 struct sk_buff *skb;
2609 struct rtmsg *rtm;
2610 struct flowi6 fl6;
2611 int err, iif = 0, oif = 0;
2612
2613 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2614 if (err < 0)
2615 goto errout;
2616
2617 err = -EINVAL;
2618 memset(&fl6, 0, sizeof(fl6));
2619
2620 if (tb[RTA_SRC]) {
2621 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2622 goto errout;
2623
2624 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2625 }
2626
2627 if (tb[RTA_DST]) {
2628 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2629 goto errout;
2630
2631 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2632 }
2633
2634 if (tb[RTA_IIF])
2635 iif = nla_get_u32(tb[RTA_IIF]);
2636
2637 if (tb[RTA_OIF])
2638 oif = nla_get_u32(tb[RTA_OIF]);
2639
2640 if (tb[RTA_MARK])
2641 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
2642
2643 if (tb[RTA_UID])
2644 fl6.flowi6_uid = make_kuid(current_user_ns(),
2645 nla_get_u32(tb[RTA_UID]));
2646 else
2647 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
2648
2649 if (iif) {
2650 struct net_device *dev;
2651 int flags = 0;
2652
2653 dev = __dev_get_by_index(net, iif);
2654 if (!dev) {
2655 err = -ENODEV;
2656 goto errout;
2657 }
2658
2659 fl6.flowi6_iif = iif;
2660
2661 if (!ipv6_addr_any(&fl6.saddr))
2662 flags |= RT6_LOOKUP_F_HAS_SADDR;
2663
2664 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2665 flags);
2666 } else {
2667 fl6.flowi6_oif = oif;
2668
2669 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2670 }
2671
2672 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2673 if (!skb) {
2674 ip6_rt_put(rt);
2675 err = -ENOBUFS;
2676 goto errout;
2677 }
2678
2679 /* Reserve room for dummy headers, this skb can pass
2680 through good chunk of routing engine.
2681 */
2682 skb_reset_mac_header(skb);
2683 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2684
2685 skb_dst_set(skb, &rt->dst);
2686
2687 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2688 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2689 nlh->nlmsg_seq, 0, 0, 0);
2690 if (err < 0) {
2691 kfree_skb(skb);
2692 goto errout;
2693 }
2694
2695 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2696 errout:
2697 return err;
2698 }
2699
2700 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2701 {
2702 struct sk_buff *skb;
2703 struct net *net = info->nl_net;
2704 u32 seq;
2705 int err;
2706
2707 err = -ENOBUFS;
2708 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2709
2710 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2711 if (!skb)
2712 goto errout;
2713
2714 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2715 event, info->portid, seq, 0, 0, 0);
2716 if (err < 0) {
2717 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2718 WARN_ON(err == -EMSGSIZE);
2719 kfree_skb(skb);
2720 goto errout;
2721 }
2722 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2723 info->nlh, gfp_any());
2724 return;
2725 errout:
2726 if (err < 0)
2727 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2728 }
2729
2730 static int ip6_route_dev_notify(struct notifier_block *this,
2731 unsigned long event, void *data)
2732 {
2733 struct net_device *dev = (struct net_device *)data;
2734 struct net *net = dev_net(dev);
2735
2736 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2737 net->ipv6.ip6_null_entry->dst.dev = dev;
2738 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2739 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2740 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2741 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2742 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2743 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2744 #endif
2745 }
2746
2747 return NOTIFY_OK;
2748 }
2749
2750 /*
2751 * /proc
2752 */
2753
2754 #ifdef CONFIG_PROC_FS
2755
2756 struct rt6_proc_arg
2757 {
2758 char *buffer;
2759 int offset;
2760 int length;
2761 int skip;
2762 int len;
2763 };
2764
2765 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2766 {
2767 struct seq_file *m = p_arg;
2768
2769 seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
2770
2771 #ifdef CONFIG_IPV6_SUBTREES
2772 seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
2773 #else
2774 seq_puts(m, "00000000000000000000000000000000 00 ");
2775 #endif
2776 if (rt->rt6i_flags & RTF_GATEWAY) {
2777 seq_printf(m, "%pi6", &rt->rt6i_gateway);
2778 } else {
2779 seq_puts(m, "00000000000000000000000000000000");
2780 }
2781 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2782 rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
2783 rt->dst.__use, rt->rt6i_flags,
2784 rt->dst.dev ? rt->dst.dev->name : "");
2785 return 0;
2786 }
2787
2788 static int ipv6_route_show(struct seq_file *m, void *v)
2789 {
2790 struct net *net = (struct net *)m->private;
2791 fib6_clean_all_ro(net, rt6_info_route, 0, m);
2792 return 0;
2793 }
2794
2795 static int ipv6_route_open(struct inode *inode, struct file *file)
2796 {
2797 return single_open_net(inode, file, ipv6_route_show);
2798 }
2799
2800 static const struct file_operations ipv6_route_proc_fops = {
2801 .owner = THIS_MODULE,
2802 .open = ipv6_route_open,
2803 .read = seq_read,
2804 .llseek = seq_lseek,
2805 .release = single_release_net,
2806 };
2807
2808 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2809 {
2810 struct net *net = (struct net *)seq->private;
2811 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2812 net->ipv6.rt6_stats->fib_nodes,
2813 net->ipv6.rt6_stats->fib_route_nodes,
2814 net->ipv6.rt6_stats->fib_rt_alloc,
2815 net->ipv6.rt6_stats->fib_rt_entries,
2816 net->ipv6.rt6_stats->fib_rt_cache,
2817 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2818 net->ipv6.rt6_stats->fib_discarded_routes);
2819
2820 return 0;
2821 }
2822
2823 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2824 {
2825 return single_open_net(inode, file, rt6_stats_seq_show);
2826 }
2827
2828 static const struct file_operations rt6_stats_seq_fops = {
2829 .owner = THIS_MODULE,
2830 .open = rt6_stats_seq_open,
2831 .read = seq_read,
2832 .llseek = seq_lseek,
2833 .release = single_release_net,
2834 };
2835 #endif /* CONFIG_PROC_FS */
2836
2837 #ifdef CONFIG_SYSCTL
2838
2839 static
2840 int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write,
2841 void __user *buffer, size_t *lenp, loff_t *ppos)
2842 {
2843 struct net *net;
2844 int delay;
2845 if (!write)
2846 return -EINVAL;
2847
2848 net = (struct net *)ctl->extra1;
2849 delay = net->ipv6.sysctl.flush_delay;
2850 proc_dointvec(ctl, write, buffer, lenp, ppos);
2851 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
2852 return 0;
2853 }
2854
2855 ctl_table ipv6_route_table_template[] = {
2856 {
2857 .procname = "flush",
2858 .data = &init_net.ipv6.sysctl.flush_delay,
2859 .maxlen = sizeof(int),
2860 .mode = 0200,
2861 .proc_handler = ipv6_sysctl_rtcache_flush
2862 },
2863 {
2864 .procname = "gc_thresh",
2865 .data = &ip6_dst_ops_template.gc_thresh,
2866 .maxlen = sizeof(int),
2867 .mode = 0644,
2868 .proc_handler = proc_dointvec,
2869 },
2870 {
2871 .procname = "max_size",
2872 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2873 .maxlen = sizeof(int),
2874 .mode = 0644,
2875 .proc_handler = proc_dointvec,
2876 },
2877 {
2878 .procname = "gc_min_interval",
2879 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2880 .maxlen = sizeof(int),
2881 .mode = 0644,
2882 .proc_handler = proc_dointvec_jiffies,
2883 },
2884 {
2885 .procname = "gc_timeout",
2886 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2887 .maxlen = sizeof(int),
2888 .mode = 0644,
2889 .proc_handler = proc_dointvec_jiffies,
2890 },
2891 {
2892 .procname = "gc_interval",
2893 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2894 .maxlen = sizeof(int),
2895 .mode = 0644,
2896 .proc_handler = proc_dointvec_jiffies,
2897 },
2898 {
2899 .procname = "gc_elasticity",
2900 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2901 .maxlen = sizeof(int),
2902 .mode = 0644,
2903 .proc_handler = proc_dointvec,
2904 },
2905 {
2906 .procname = "mtu_expires",
2907 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2908 .maxlen = sizeof(int),
2909 .mode = 0644,
2910 .proc_handler = proc_dointvec_jiffies,
2911 },
2912 {
2913 .procname = "min_adv_mss",
2914 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2915 .maxlen = sizeof(int),
2916 .mode = 0644,
2917 .proc_handler = proc_dointvec,
2918 },
2919 {
2920 .procname = "gc_min_interval_ms",
2921 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2922 .maxlen = sizeof(int),
2923 .mode = 0644,
2924 .proc_handler = proc_dointvec_ms_jiffies,
2925 },
2926 { }
2927 };
2928
2929 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2930 {
2931 struct ctl_table *table;
2932
2933 table = kmemdup(ipv6_route_table_template,
2934 sizeof(ipv6_route_table_template),
2935 GFP_KERNEL);
2936
2937 if (table) {
2938 table[0].data = &net->ipv6.sysctl.flush_delay;
2939 table[0].extra1 = net;
2940 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2941 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2942 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2943 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2944 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2945 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2946 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2947 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2948 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2949
2950 /* Don't export sysctls to unprivileged users */
2951 if (net->user_ns != &init_user_ns)
2952 table[0].procname = NULL;
2953 }
2954
2955 return table;
2956 }
2957 #endif
2958
2959 static int __net_init ip6_route_net_init(struct net *net)
2960 {
2961 int ret = -ENOMEM;
2962
2963 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2964 sizeof(net->ipv6.ip6_dst_ops));
2965
2966 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2967 goto out_ip6_dst_ops;
2968
2969 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2970 sizeof(*net->ipv6.ip6_null_entry),
2971 GFP_KERNEL);
2972 if (!net->ipv6.ip6_null_entry)
2973 goto out_ip6_dst_entries;
2974 net->ipv6.ip6_null_entry->dst.path =
2975 (struct dst_entry *)net->ipv6.ip6_null_entry;
2976 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2977 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
2978 ip6_template_metrics, true);
2979
2980 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2981 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2982 sizeof(*net->ipv6.ip6_prohibit_entry),
2983 GFP_KERNEL);
2984 if (!net->ipv6.ip6_prohibit_entry)
2985 goto out_ip6_null_entry;
2986 net->ipv6.ip6_prohibit_entry->dst.path =
2987 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
2988 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2989 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
2990 ip6_template_metrics, true);
2991
2992 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
2993 sizeof(*net->ipv6.ip6_blk_hole_entry),
2994 GFP_KERNEL);
2995 if (!net->ipv6.ip6_blk_hole_entry)
2996 goto out_ip6_prohibit_entry;
2997 net->ipv6.ip6_blk_hole_entry->dst.path =
2998 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
2999 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3000 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3001 ip6_template_metrics, true);
3002 #endif
3003
3004 net->ipv6.sysctl.flush_delay = 0;
3005 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3006 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3007 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3008 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3009 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3010 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3011 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3012
3013 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3014
3015 ret = 0;
3016 out:
3017 return ret;
3018
3019 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3020 out_ip6_prohibit_entry:
3021 kfree(net->ipv6.ip6_prohibit_entry);
3022 out_ip6_null_entry:
3023 kfree(net->ipv6.ip6_null_entry);
3024 #endif
3025 out_ip6_dst_entries:
3026 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3027 out_ip6_dst_ops:
3028 goto out;
3029 }
3030
3031 static void __net_exit ip6_route_net_exit(struct net *net)
3032 {
3033 kfree(net->ipv6.ip6_null_entry);
3034 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3035 kfree(net->ipv6.ip6_prohibit_entry);
3036 kfree(net->ipv6.ip6_blk_hole_entry);
3037 #endif
3038 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3039 }
3040
3041 static int __net_init ip6_route_net_init_late(struct net *net)
3042 {
3043 #ifdef CONFIG_PROC_FS
3044 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3045 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3046 #endif
3047 return 0;
3048 }
3049
3050 static void __net_exit ip6_route_net_exit_late(struct net *net)
3051 {
3052 #ifdef CONFIG_PROC_FS
3053 remove_proc_entry("ipv6_route", net->proc_net);
3054 remove_proc_entry("rt6_stats", net->proc_net);
3055 #endif
3056 }
3057
3058 static struct pernet_operations ip6_route_net_ops = {
3059 .init = ip6_route_net_init,
3060 .exit = ip6_route_net_exit,
3061 };
3062
3063 static int __net_init ipv6_inetpeer_init(struct net *net)
3064 {
3065 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3066
3067 if (!bp)
3068 return -ENOMEM;
3069 inet_peer_base_init(bp);
3070 net->ipv6.peers = bp;
3071 return 0;
3072 }
3073
3074 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3075 {
3076 struct inet_peer_base *bp = net->ipv6.peers;
3077
3078 net->ipv6.peers = NULL;
3079 inetpeer_invalidate_tree(bp);
3080 kfree(bp);
3081 }
3082
3083 static struct pernet_operations ipv6_inetpeer_ops = {
3084 .init = ipv6_inetpeer_init,
3085 .exit = ipv6_inetpeer_exit,
3086 };
3087
3088 static struct pernet_operations ip6_route_net_late_ops = {
3089 .init = ip6_route_net_init_late,
3090 .exit = ip6_route_net_exit_late,
3091 };
3092
3093 static struct notifier_block ip6_route_dev_notifier = {
3094 .notifier_call = ip6_route_dev_notify,
3095 .priority = 0,
3096 };
3097
3098 int __init ip6_route_init(void)
3099 {
3100 int ret;
3101
3102 ret = -ENOMEM;
3103 ip6_dst_ops_template.kmem_cachep =
3104 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3105 SLAB_HWCACHE_ALIGN, NULL);
3106 if (!ip6_dst_ops_template.kmem_cachep)
3107 goto out;
3108
3109 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3110 if (ret)
3111 goto out_kmem_cache;
3112
3113 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3114 if (ret)
3115 goto out_dst_entries;
3116
3117 ret = register_pernet_subsys(&ip6_route_net_ops);
3118 if (ret)
3119 goto out_register_inetpeer;
3120
3121 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3122
3123 /* Registering of the loopback is done before this portion of code,
3124 * the loopback reference in rt6_info will not be taken, do it
3125 * manually for init_net */
3126 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3127 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3128 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3129 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3130 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3131 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3132 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3133 #endif
3134 ret = fib6_init();
3135 if (ret)
3136 goto out_register_subsys;
3137
3138 ret = xfrm6_init();
3139 if (ret)
3140 goto out_fib6_init;
3141
3142 ret = fib6_rules_init();
3143 if (ret)
3144 goto xfrm6_init;
3145
3146 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3147 if (ret)
3148 goto fib6_rules_init;
3149
3150 ret = -ENOBUFS;
3151 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3152 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3153 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3154 goto out_register_late_subsys;
3155
3156 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3157 if (ret)
3158 goto out_register_late_subsys;
3159
3160 out:
3161 return ret;
3162
3163 out_register_late_subsys:
3164 unregister_pernet_subsys(&ip6_route_net_late_ops);
3165 fib6_rules_init:
3166 fib6_rules_cleanup();
3167 xfrm6_init:
3168 xfrm6_fini();
3169 out_fib6_init:
3170 fib6_gc_cleanup();
3171 out_register_subsys:
3172 unregister_pernet_subsys(&ip6_route_net_ops);
3173 out_register_inetpeer:
3174 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3175 out_dst_entries:
3176 dst_entries_destroy(&ip6_dst_blackhole_ops);
3177 out_kmem_cache:
3178 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3179 goto out;
3180 }
3181
3182 void ip6_route_cleanup(void)
3183 {
3184 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3185 unregister_pernet_subsys(&ip6_route_net_late_ops);
3186 fib6_rules_cleanup();
3187 xfrm6_fini();
3188 fib6_gc_cleanup();
3189 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3190 unregister_pernet_subsys(&ip6_route_net_ops);
3191 dst_entries_destroy(&ip6_dst_blackhole_ops);
3192 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3193 }