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ipv6: fix typo in fib6_net_exit()
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / route.c
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1/*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * 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
68enum rt6_nud_state {
69 RT6_NUD_FAIL_HARD = -2,
70 RT6_NUD_FAIL_SOFT = -1,
71 RT6_NUD_SUCCEED = 1
72};
73
74static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
75 const struct in6_addr *dest);
76static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
77static unsigned int ip6_default_advmss(const struct dst_entry *dst);
78static unsigned int ip6_mtu(const struct dst_entry *dst);
79static struct dst_entry *ip6_negative_advice(struct dst_entry *);
80static void ip6_dst_destroy(struct dst_entry *);
81static void ip6_dst_ifdown(struct dst_entry *,
82 struct net_device *dev, int how);
83static int ip6_dst_gc(struct dst_ops *ops);
84
85static int ip6_pkt_discard(struct sk_buff *skb);
86static int ip6_pkt_discard_out(struct sk_buff *skb);
87static int ip6_pkt_prohibit(struct sk_buff *skb);
88static int ip6_pkt_prohibit_out(struct sk_buff *skb);
89static void ip6_link_failure(struct sk_buff *skb);
90static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
91 struct sk_buff *skb, u32 mtu);
92static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
93 struct sk_buff *skb);
94
95#ifdef CONFIG_IPV6_ROUTE_INFO
96static struct rt6_info *rt6_add_route_info(struct net *net,
97 const struct in6_addr *prefix, int prefixlen,
98 const struct in6_addr *gwaddr, int ifindex,
99 unsigned int pref);
100static struct rt6_info *rt6_get_route_info(struct net *net,
101 const struct in6_addr *prefix, int prefixlen,
102 const struct in6_addr *gwaddr, int ifindex);
103#endif
104
105static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
106{
107 struct rt6_info *rt = (struct rt6_info *) dst;
108 struct inet_peer *peer;
109 u32 *p = NULL;
110
111 if (!(rt->dst.flags & DST_HOST))
112 return dst_cow_metrics_generic(dst, old);
113
114 peer = rt6_get_peer_create(rt);
115 if (peer) {
116 u32 *old_p = __DST_METRICS_PTR(old);
117 unsigned long prev, new;
118
119 p = peer->metrics;
120 if (inet_metrics_new(peer))
121 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
122
123 new = (unsigned long) p;
124 prev = cmpxchg(&dst->_metrics, old, new);
125
126 if (prev != old) {
127 p = __DST_METRICS_PTR(prev);
128 if (prev & DST_METRICS_READ_ONLY)
129 p = NULL;
130 }
131 }
132 return p;
133}
134
135static inline const void *choose_neigh_daddr(struct rt6_info *rt,
136 struct sk_buff *skb,
137 const void *daddr)
138{
139 struct in6_addr *p = &rt->rt6i_gateway;
140
141 if (!ipv6_addr_any(p))
142 return (const void *) p;
143 else if (skb)
144 return &ipv6_hdr(skb)->daddr;
145 return daddr;
146}
147
148static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
149 struct sk_buff *skb,
150 const void *daddr)
151{
152 struct rt6_info *rt = (struct rt6_info *) dst;
153 struct neighbour *n;
154
155 daddr = choose_neigh_daddr(rt, skb, daddr);
156 n = __ipv6_neigh_lookup(dst->dev, daddr);
157 if (n)
158 return n;
159 return neigh_create(&nd_tbl, daddr, dst->dev);
160}
161
162static struct dst_ops ip6_dst_ops_template = {
163 .family = AF_INET6,
164 .protocol = cpu_to_be16(ETH_P_IPV6),
165 .gc = ip6_dst_gc,
166 .gc_thresh = 1024,
167 .check = ip6_dst_check,
168 .default_advmss = ip6_default_advmss,
169 .mtu = ip6_mtu,
170 .cow_metrics = ipv6_cow_metrics,
171 .destroy = ip6_dst_destroy,
172 .ifdown = ip6_dst_ifdown,
173 .negative_advice = ip6_negative_advice,
174 .link_failure = ip6_link_failure,
175 .update_pmtu = ip6_rt_update_pmtu,
176 .redirect = rt6_do_redirect,
177 .local_out = __ip6_local_out,
178 .neigh_lookup = ip6_neigh_lookup,
179};
180
181static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
182{
183 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
184
185 return mtu ? : dst->dev->mtu;
186}
187
188static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
189 struct sk_buff *skb, u32 mtu)
190{
191}
192
193static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
194 struct sk_buff *skb)
195{
196}
197
198static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
199 unsigned long old)
200{
201 return NULL;
202}
203
204static struct dst_ops ip6_dst_blackhole_ops = {
205 .family = AF_INET6,
206 .protocol = cpu_to_be16(ETH_P_IPV6),
207 .destroy = ip6_dst_destroy,
208 .check = ip6_dst_check,
209 .mtu = ip6_blackhole_mtu,
210 .default_advmss = ip6_default_advmss,
211 .update_pmtu = ip6_rt_blackhole_update_pmtu,
212 .redirect = ip6_rt_blackhole_redirect,
213 .cow_metrics = ip6_rt_blackhole_cow_metrics,
214 .neigh_lookup = ip6_neigh_lookup,
215};
216
217static const u32 ip6_template_metrics[RTAX_MAX] = {
218 [RTAX_HOPLIMIT - 1] = 0,
219};
220
221static const struct rt6_info ip6_null_entry_template = {
222 .dst = {
223 .__refcnt = ATOMIC_INIT(1),
224 .__use = 1,
225 .obsolete = DST_OBSOLETE_FORCE_CHK,
226 .error = -ENETUNREACH,
227 .input = ip6_pkt_discard,
228 .output = ip6_pkt_discard_out,
229 },
230 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
231 .rt6i_protocol = RTPROT_KERNEL,
232 .rt6i_metric = ~(u32) 0,
233 .rt6i_ref = ATOMIC_INIT(1),
234};
235
236#ifdef CONFIG_IPV6_MULTIPLE_TABLES
237
238static const struct rt6_info ip6_prohibit_entry_template = {
239 .dst = {
240 .__refcnt = ATOMIC_INIT(1),
241 .__use = 1,
242 .obsolete = DST_OBSOLETE_FORCE_CHK,
243 .error = -EACCES,
244 .input = ip6_pkt_prohibit,
245 .output = ip6_pkt_prohibit_out,
246 },
247 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
248 .rt6i_protocol = RTPROT_KERNEL,
249 .rt6i_metric = ~(u32) 0,
250 .rt6i_ref = ATOMIC_INIT(1),
251};
252
253static const struct rt6_info ip6_blk_hole_entry_template = {
254 .dst = {
255 .__refcnt = ATOMIC_INIT(1),
256 .__use = 1,
257 .obsolete = DST_OBSOLETE_FORCE_CHK,
258 .error = -EINVAL,
259 .input = dst_discard,
260 .output = dst_discard,
261 },
262 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
263 .rt6i_protocol = RTPROT_KERNEL,
264 .rt6i_metric = ~(u32) 0,
265 .rt6i_ref = ATOMIC_INIT(1),
266};
267
268#endif
269
270/* allocate dst with ip6_dst_ops */
271static inline struct rt6_info *ip6_dst_alloc(struct net *net,
272 struct net_device *dev,
273 int flags,
274 struct fib6_table *table)
275{
276 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
277 0, DST_OBSOLETE_FORCE_CHK, flags);
278
279 if (rt) {
280 struct dst_entry *dst = &rt->dst;
281
282 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
283 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
284 rt->rt6i_genid = rt_genid(net);
285 INIT_LIST_HEAD(&rt->rt6i_siblings);
286 rt->rt6i_nsiblings = 0;
287 }
288 return rt;
289}
290
291static void ip6_dst_destroy(struct dst_entry *dst)
292{
293 struct rt6_info *rt = (struct rt6_info *)dst;
294 struct inet6_dev *idev = rt->rt6i_idev;
295 struct dst_entry *from = dst->from;
296
297 if (!(rt->dst.flags & DST_HOST))
298 dst_destroy_metrics_generic(dst);
299
300 if (idev) {
301 rt->rt6i_idev = NULL;
302 in6_dev_put(idev);
303 }
304
305 dst->from = NULL;
306 dst_release(from);
307
308 if (rt6_has_peer(rt)) {
309 struct inet_peer *peer = rt6_peer_ptr(rt);
310 inet_putpeer(peer);
311 }
312}
313
314void rt6_bind_peer(struct rt6_info *rt, int create)
315{
316 struct inet_peer_base *base;
317 struct inet_peer *peer;
318
319 base = inetpeer_base_ptr(rt->_rt6i_peer);
320 if (!base)
321 return;
322
323 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
324 if (peer) {
325 if (!rt6_set_peer(rt, peer))
326 inet_putpeer(peer);
327 }
328}
329
330static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
331 int how)
332{
333 struct rt6_info *rt = (struct rt6_info *)dst;
334 struct inet6_dev *idev = rt->rt6i_idev;
335 struct net_device *loopback_dev =
336 dev_net(dev)->loopback_dev;
337
338 if (dev != loopback_dev) {
339 if (idev && idev->dev == dev) {
340 struct inet6_dev *loopback_idev =
341 in6_dev_get(loopback_dev);
342 if (loopback_idev) {
343 rt->rt6i_idev = loopback_idev;
344 in6_dev_put(idev);
345 }
346 }
347 }
348}
349
350static bool rt6_check_expired(const struct rt6_info *rt)
351{
352 if (rt->rt6i_flags & RTF_EXPIRES) {
353 if (time_after(jiffies, rt->dst.expires))
354 return true;
355 } else if (rt->dst.from) {
356 return rt6_check_expired((struct rt6_info *) rt->dst.from);
357 }
358 return false;
359}
360
361static bool rt6_need_strict(const struct in6_addr *daddr)
362{
363 return ipv6_addr_type(daddr) &
364 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
365}
366
367/* Multipath route selection:
368 * Hash based function using packet header and flowlabel.
369 * Adapted from fib_info_hashfn()
370 */
371static int rt6_info_hash_nhsfn(unsigned int candidate_count,
372 const struct flowi6 *fl6)
373{
374 unsigned int val = fl6->flowi6_proto;
375
376 val ^= ipv6_addr_hash(&fl6->daddr);
377 val ^= ipv6_addr_hash(&fl6->saddr);
378
379 /* Work only if this not encapsulated */
380 switch (fl6->flowi6_proto) {
381 case IPPROTO_UDP:
382 case IPPROTO_TCP:
383 case IPPROTO_SCTP:
384 val ^= (__force u16)fl6->fl6_sport;
385 val ^= (__force u16)fl6->fl6_dport;
386 break;
387
388 case IPPROTO_ICMPV6:
389 val ^= (__force u16)fl6->fl6_icmp_type;
390 val ^= (__force u16)fl6->fl6_icmp_code;
391 break;
392 }
393 /* RFC6438 recommands to use flowlabel */
394 val ^= (__force u32)fl6->flowlabel;
395
396 /* Perhaps, we need to tune, this function? */
397 val = val ^ (val >> 7) ^ (val >> 12);
398 return val % candidate_count;
399}
400
401static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
402 struct flowi6 *fl6)
403{
404 struct rt6_info *sibling, *next_sibling;
405 int route_choosen;
406
407 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
408 /* Don't change the route, if route_choosen == 0
409 * (siblings does not include ourself)
410 */
411 if (route_choosen)
412 list_for_each_entry_safe(sibling, next_sibling,
413 &match->rt6i_siblings, rt6i_siblings) {
414 route_choosen--;
415 if (route_choosen == 0) {
416 match = sibling;
417 break;
418 }
419 }
420 return match;
421}
422
423/*
424 * Route lookup. Any table->tb6_lock is implied.
425 */
426
427static inline struct rt6_info *rt6_device_match(struct net *net,
428 struct rt6_info *rt,
429 const struct in6_addr *saddr,
430 int oif,
431 int flags)
432{
433 struct rt6_info *local = NULL;
434 struct rt6_info *sprt;
435
436 if (!oif && ipv6_addr_any(saddr))
437 goto out;
438
439 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
440 struct net_device *dev = sprt->dst.dev;
441
442 if (oif) {
443 if (dev->ifindex == oif)
444 return sprt;
445 if (dev->flags & IFF_LOOPBACK) {
446 if (!sprt->rt6i_idev ||
447 sprt->rt6i_idev->dev->ifindex != oif) {
448 if (flags & RT6_LOOKUP_F_IFACE && oif)
449 continue;
450 if (local && (!oif ||
451 local->rt6i_idev->dev->ifindex == oif))
452 continue;
453 }
454 local = sprt;
455 }
456 } else {
457 if (ipv6_chk_addr(net, saddr, dev,
458 flags & RT6_LOOKUP_F_IFACE))
459 return sprt;
460 }
461 }
462
463 if (oif) {
464 if (local)
465 return local;
466
467 if (flags & RT6_LOOKUP_F_IFACE)
468 return net->ipv6.ip6_null_entry;
469 }
470out:
471 return rt;
472}
473
474#ifdef CONFIG_IPV6_ROUTER_PREF
475struct __rt6_probe_work {
476 struct work_struct work;
477 struct in6_addr target;
478 struct net_device *dev;
479};
480
481static void rt6_probe_deferred(struct work_struct *w)
482{
483 struct in6_addr mcaddr;
484 struct __rt6_probe_work *work =
485 container_of(w, struct __rt6_probe_work, work);
486
487 addrconf_addr_solict_mult(&work->target, &mcaddr);
488 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
489 dev_put(work->dev);
490 kfree(w);
491}
492
493static void rt6_probe(struct rt6_info *rt)
494{
495 struct neighbour *neigh;
496 /*
497 * Okay, this does not seem to be appropriate
498 * for now, however, we need to check if it
499 * is really so; aka Router Reachability Probing.
500 *
501 * Router Reachability Probe MUST be rate-limited
502 * to no more than one per minute.
503 */
504 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
505 return;
506 rcu_read_lock_bh();
507 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
508 if (neigh) {
509 write_lock(&neigh->lock);
510 if (neigh->nud_state & NUD_VALID)
511 goto out;
512 }
513
514 if (!neigh ||
515 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
516 struct __rt6_probe_work *work;
517
518 work = kmalloc(sizeof(*work), GFP_ATOMIC);
519
520 if (neigh && work)
521 neigh->updated = jiffies;
522
523 if (neigh)
524 write_unlock(&neigh->lock);
525
526 if (work) {
527 INIT_WORK(&work->work, rt6_probe_deferred);
528 work->target = rt->rt6i_gateway;
529 dev_hold(rt->dst.dev);
530 work->dev = rt->dst.dev;
531 schedule_work(&work->work);
532 }
533 } else {
534out:
535 write_unlock(&neigh->lock);
536 }
537 rcu_read_unlock_bh();
538}
539#else
540static inline void rt6_probe(struct rt6_info *rt)
541{
542}
543#endif
544
545/*
546 * Default Router Selection (RFC 2461 6.3.6)
547 */
548static inline int rt6_check_dev(struct rt6_info *rt, int oif)
549{
550 struct net_device *dev = rt->dst.dev;
551 if (!oif || dev->ifindex == oif)
552 return 2;
553 if ((dev->flags & IFF_LOOPBACK) &&
554 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
555 return 1;
556 return 0;
557}
558
559static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
560{
561 struct neighbour *neigh;
562 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
563
564 if (rt->rt6i_flags & RTF_NONEXTHOP ||
565 !(rt->rt6i_flags & RTF_GATEWAY))
566 return RT6_NUD_SUCCEED;
567
568 rcu_read_lock_bh();
569 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
570 if (neigh) {
571 read_lock(&neigh->lock);
572 if (neigh->nud_state & NUD_VALID)
573 ret = RT6_NUD_SUCCEED;
574#ifdef CONFIG_IPV6_ROUTER_PREF
575 else if (!(neigh->nud_state & NUD_FAILED))
576 ret = RT6_NUD_SUCCEED;
577#endif
578 read_unlock(&neigh->lock);
579 } else {
580 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
581 RT6_NUD_SUCCEED : RT6_NUD_FAIL_SOFT;
582 }
583 rcu_read_unlock_bh();
584
585 return ret;
586}
587
588static int rt6_score_route(struct rt6_info *rt, int oif,
589 int strict)
590{
591 int m;
592
593 m = rt6_check_dev(rt, oif);
594 if (!m && (strict & RT6_LOOKUP_F_IFACE))
595 return RT6_NUD_FAIL_HARD;
596#ifdef CONFIG_IPV6_ROUTER_PREF
597 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
598#endif
599 if (strict & RT6_LOOKUP_F_REACHABLE) {
600 int n = rt6_check_neigh(rt);
601 if (n < 0)
602 return n;
603 }
604 return m;
605}
606
607static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
608 int *mpri, struct rt6_info *match,
609 bool *do_rr)
610{
611 int m;
612 bool match_do_rr = false;
613
614 if (rt6_check_expired(rt))
615 goto out;
616
617 m = rt6_score_route(rt, oif, strict);
618 if (m == RT6_NUD_FAIL_SOFT && !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF)) {
619 match_do_rr = true;
620 m = 0; /* lowest valid score */
621 } else if (m < 0) {
622 goto out;
623 }
624
625 if (strict & RT6_LOOKUP_F_REACHABLE)
626 rt6_probe(rt);
627
628 if (m > *mpri) {
629 *do_rr = match_do_rr;
630 *mpri = m;
631 match = rt;
632 }
633out:
634 return match;
635}
636
637static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
638 struct rt6_info *rr_head,
639 u32 metric, int oif, int strict,
640 bool *do_rr)
641{
642 struct rt6_info *rt, *match;
643 int mpri = -1;
644
645 match = NULL;
646 for (rt = rr_head; rt && rt->rt6i_metric == metric;
647 rt = rt->dst.rt6_next)
648 match = find_match(rt, oif, strict, &mpri, match, do_rr);
649 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
650 rt = rt->dst.rt6_next)
651 match = find_match(rt, oif, strict, &mpri, match, do_rr);
652
653 return match;
654}
655
656static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
657{
658 struct rt6_info *match, *rt0;
659 struct net *net;
660 bool do_rr = false;
661
662 rt0 = fn->rr_ptr;
663 if (!rt0)
664 fn->rr_ptr = rt0 = fn->leaf;
665
666 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
667 &do_rr);
668
669 if (do_rr) {
670 struct rt6_info *next = rt0->dst.rt6_next;
671
672 /* no entries matched; do round-robin */
673 if (!next || next->rt6i_metric != rt0->rt6i_metric)
674 next = fn->leaf;
675
676 if (next != rt0)
677 fn->rr_ptr = next;
678 }
679
680 net = dev_net(rt0->dst.dev);
681 return match ? match : net->ipv6.ip6_null_entry;
682}
683
684#ifdef CONFIG_IPV6_ROUTE_INFO
685int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
686 const struct in6_addr *gwaddr)
687{
688 struct net *net = dev_net(dev);
689 struct route_info *rinfo = (struct route_info *) opt;
690 struct in6_addr prefix_buf, *prefix;
691 unsigned int pref;
692 unsigned long lifetime;
693 struct rt6_info *rt;
694
695 if (len < sizeof(struct route_info)) {
696 return -EINVAL;
697 }
698
699 /* Sanity check for prefix_len and length */
700 if (rinfo->length > 3) {
701 return -EINVAL;
702 } else if (rinfo->prefix_len > 128) {
703 return -EINVAL;
704 } else if (rinfo->prefix_len > 64) {
705 if (rinfo->length < 2) {
706 return -EINVAL;
707 }
708 } else if (rinfo->prefix_len > 0) {
709 if (rinfo->length < 1) {
710 return -EINVAL;
711 }
712 }
713
714 pref = rinfo->route_pref;
715 if (pref == ICMPV6_ROUTER_PREF_INVALID)
716 return -EINVAL;
717
718 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
719
720 if (rinfo->length == 3)
721 prefix = (struct in6_addr *)rinfo->prefix;
722 else {
723 /* this function is safe */
724 ipv6_addr_prefix(&prefix_buf,
725 (struct in6_addr *)rinfo->prefix,
726 rinfo->prefix_len);
727 prefix = &prefix_buf;
728 }
729
730 if (rinfo->prefix_len == 0)
731 rt = rt6_get_dflt_router(gwaddr, dev);
732 else
733 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
734 gwaddr, dev->ifindex);
735
736 if (rt && !lifetime) {
737 ip6_del_rt(rt);
738 rt = NULL;
739 }
740
741 if (!rt && lifetime)
742 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
743 pref);
744 else if (rt)
745 rt->rt6i_flags = RTF_ROUTEINFO |
746 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
747
748 if (rt) {
749 if (!addrconf_finite_timeout(lifetime))
750 rt6_clean_expires(rt);
751 else
752 rt6_set_expires(rt, jiffies + HZ * lifetime);
753
754 ip6_rt_put(rt);
755 }
756 return 0;
757}
758#endif
759
760#define BACKTRACK(__net, saddr) \
761do { \
762 if (rt == __net->ipv6.ip6_null_entry) { \
763 struct fib6_node *pn; \
764 while (1) { \
765 if (fn->fn_flags & RTN_TL_ROOT) \
766 goto out; \
767 pn = fn->parent; \
768 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
769 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
770 else \
771 fn = pn; \
772 if (fn->fn_flags & RTN_RTINFO) \
773 goto restart; \
774 } \
775 } \
776} while (0)
777
778static struct rt6_info *ip6_pol_route_lookup(struct net *net,
779 struct fib6_table *table,
780 struct flowi6 *fl6, int flags)
781{
782 struct fib6_node *fn;
783 struct rt6_info *rt;
784
785 read_lock_bh(&table->tb6_lock);
786 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
787restart:
788 rt = fn->leaf;
789 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
790 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
791 rt = rt6_multipath_select(rt, fl6);
792 BACKTRACK(net, &fl6->saddr);
793out:
794 dst_use(&rt->dst, jiffies);
795 read_unlock_bh(&table->tb6_lock);
796 return rt;
797
798}
799
800struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
801 int flags)
802{
803 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
804}
805EXPORT_SYMBOL_GPL(ip6_route_lookup);
806
807struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
808 const struct in6_addr *saddr, int oif, int strict)
809{
810 struct flowi6 fl6 = {
811 .flowi6_oif = oif,
812 .daddr = *daddr,
813 };
814 struct dst_entry *dst;
815 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
816
817 if (saddr) {
818 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
819 flags |= RT6_LOOKUP_F_HAS_SADDR;
820 }
821
822 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
823 if (dst->error == 0)
824 return (struct rt6_info *) dst;
825
826 dst_release(dst);
827
828 return NULL;
829}
830
831EXPORT_SYMBOL(rt6_lookup);
832
833/* ip6_ins_rt is called with FREE table->tb6_lock.
834 It takes new route entry, the addition fails by any reason the
835 route is freed. In any case, if caller does not hold it, it may
836 be destroyed.
837 */
838
839static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
840{
841 int err;
842 struct fib6_table *table;
843
844 table = rt->rt6i_table;
845 write_lock_bh(&table->tb6_lock);
846 err = fib6_add(&table->tb6_root, rt, info);
847 write_unlock_bh(&table->tb6_lock);
848
849 return err;
850}
851
852int ip6_ins_rt(struct rt6_info *rt)
853{
854 struct nl_info info = {
855 .nl_net = dev_net(rt->dst.dev),
856 };
857 return __ip6_ins_rt(rt, &info);
858}
859
860static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
861 const struct in6_addr *daddr,
862 const struct in6_addr *saddr)
863{
864 struct rt6_info *rt;
865
866 /*
867 * Clone the route.
868 */
869
870 rt = ip6_rt_copy(ort, daddr);
871
872 if (rt) {
873 if (!(rt->rt6i_flags & RTF_GATEWAY)) {
874 if (ort->rt6i_dst.plen != 128 &&
875 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
876 rt->rt6i_flags |= RTF_ANYCAST;
877 }
878
879 rt->rt6i_flags |= RTF_CACHE;
880
881#ifdef CONFIG_IPV6_SUBTREES
882 if (rt->rt6i_src.plen && saddr) {
883 rt->rt6i_src.addr = *saddr;
884 rt->rt6i_src.plen = 128;
885 }
886#endif
887 }
888
889 return rt;
890}
891
892static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
893 const struct in6_addr *daddr)
894{
895 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
896
897 if (rt)
898 rt->rt6i_flags |= RTF_CACHE;
899 return rt;
900}
901
902static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
903 struct flowi6 *fl6, int flags)
904{
905 struct fib6_node *fn;
906 struct rt6_info *rt, *nrt;
907 int strict = 0;
908 int attempts = 3;
909 int err;
910 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
911
912 strict |= flags & RT6_LOOKUP_F_IFACE;
913
914relookup:
915 read_lock_bh(&table->tb6_lock);
916
917restart_2:
918 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
919
920restart:
921 rt = rt6_select(fn, oif, strict | reachable);
922 if (rt->rt6i_nsiblings && oif == 0)
923 rt = rt6_multipath_select(rt, fl6);
924 BACKTRACK(net, &fl6->saddr);
925 if (rt == net->ipv6.ip6_null_entry ||
926 rt->rt6i_flags & RTF_CACHE)
927 goto out;
928
929 dst_hold(&rt->dst);
930 read_unlock_bh(&table->tb6_lock);
931
932 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
933 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
934 else if (!(rt->dst.flags & DST_HOST))
935 nrt = rt6_alloc_clone(rt, &fl6->daddr);
936 else
937 goto out2;
938
939 ip6_rt_put(rt);
940 rt = nrt ? : net->ipv6.ip6_null_entry;
941
942 dst_hold(&rt->dst);
943 if (nrt) {
944 err = ip6_ins_rt(nrt);
945 if (!err)
946 goto out2;
947 }
948
949 if (--attempts <= 0)
950 goto out2;
951
952 /*
953 * Race condition! In the gap, when table->tb6_lock was
954 * released someone could insert this route. Relookup.
955 */
956 ip6_rt_put(rt);
957 goto relookup;
958
959out:
960 if (reachable) {
961 reachable = 0;
962 goto restart_2;
963 }
964 dst_hold(&rt->dst);
965 read_unlock_bh(&table->tb6_lock);
966out2:
967 rt->dst.lastuse = jiffies;
968 rt->dst.__use++;
969
970 return rt;
971}
972
973static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
974 struct flowi6 *fl6, int flags)
975{
976 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
977}
978
979static struct dst_entry *ip6_route_input_lookup(struct net *net,
980 struct net_device *dev,
981 struct flowi6 *fl6, int flags)
982{
983 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
984 flags |= RT6_LOOKUP_F_IFACE;
985
986 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
987}
988
989void ip6_route_input(struct sk_buff *skb)
990{
991 const struct ipv6hdr *iph = ipv6_hdr(skb);
992 struct net *net = dev_net(skb->dev);
993 int flags = RT6_LOOKUP_F_HAS_SADDR;
994 struct flowi6 fl6 = {
995 .flowi6_iif = skb->dev->ifindex,
996 .daddr = iph->daddr,
997 .saddr = iph->saddr,
998 .flowlabel = ip6_flowinfo(iph),
999 .flowi6_mark = skb->mark,
1000 .flowi6_proto = iph->nexthdr,
1001 };
1002
1003 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1004}
1005
1006static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1007 struct flowi6 *fl6, int flags)
1008{
1009 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1010}
1011
1012struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
1013 struct flowi6 *fl6)
1014{
1015 int flags = 0;
1016
1017 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1018
1019 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1020 flags |= RT6_LOOKUP_F_IFACE;
1021
1022 if (!ipv6_addr_any(&fl6->saddr))
1023 flags |= RT6_LOOKUP_F_HAS_SADDR;
1024 else if (sk)
1025 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1026
1027 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1028}
1029
1030EXPORT_SYMBOL(ip6_route_output);
1031
1032struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1033{
1034 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1035 struct dst_entry *new = NULL;
1036
1037 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1038 if (rt) {
1039 new = &rt->dst;
1040
1041 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1042 rt6_init_peer(rt, net->ipv6.peers);
1043
1044 new->__use = 1;
1045 new->input = dst_discard;
1046 new->output = dst_discard;
1047
1048 if (dst_metrics_read_only(&ort->dst))
1049 new->_metrics = ort->dst._metrics;
1050 else
1051 dst_copy_metrics(new, &ort->dst);
1052 rt->rt6i_idev = ort->rt6i_idev;
1053 if (rt->rt6i_idev)
1054 in6_dev_hold(rt->rt6i_idev);
1055
1056 rt->rt6i_gateway = ort->rt6i_gateway;
1057 rt->rt6i_flags = ort->rt6i_flags;
1058 rt->rt6i_metric = 0;
1059
1060 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1061#ifdef CONFIG_IPV6_SUBTREES
1062 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1063#endif
1064
1065 dst_free(new);
1066 }
1067
1068 dst_release(dst_orig);
1069 return new ? new : ERR_PTR(-ENOMEM);
1070}
1071
1072/*
1073 * Destination cache support functions
1074 */
1075
1076static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1077{
1078 struct rt6_info *rt;
1079
1080 rt = (struct rt6_info *) dst;
1081
1082 /* All IPV6 dsts are created with ->obsolete set to the value
1083 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1084 * into this function always.
1085 */
1086 if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev)))
1087 return NULL;
1088
1089 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1090 return NULL;
1091
1092 if (rt6_check_expired(rt))
1093 return NULL;
1094
1095 return dst;
1096}
1097
1098static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1099{
1100 struct rt6_info *rt = (struct rt6_info *) dst;
1101
1102 if (rt) {
1103 if (rt->rt6i_flags & RTF_CACHE) {
1104 if (rt6_check_expired(rt)) {
1105 ip6_del_rt(rt);
1106 dst = NULL;
1107 }
1108 } else {
1109 dst_release(dst);
1110 dst = NULL;
1111 }
1112 }
1113 return dst;
1114}
1115
1116static void ip6_link_failure(struct sk_buff *skb)
1117{
1118 struct rt6_info *rt;
1119
1120 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1121
1122 rt = (struct rt6_info *) skb_dst(skb);
1123 if (rt) {
1124 if (rt->rt6i_flags & RTF_CACHE) {
1125 dst_hold(&rt->dst);
1126 if (ip6_del_rt(rt))
1127 dst_free(&rt->dst);
1128 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1129 rt->rt6i_node->fn_sernum = -1;
1130 }
1131 }
1132}
1133
1134static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1135 struct sk_buff *skb, u32 mtu)
1136{
1137 struct rt6_info *rt6 = (struct rt6_info*)dst;
1138
1139 dst_confirm(dst);
1140 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1141 struct net *net = dev_net(dst->dev);
1142
1143 rt6->rt6i_flags |= RTF_MODIFIED;
1144 if (mtu < IPV6_MIN_MTU)
1145 mtu = IPV6_MIN_MTU;
1146
1147 dst_metric_set(dst, RTAX_MTU, mtu);
1148 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1149 }
1150}
1151
1152void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1153 int oif, u32 mark)
1154{
1155 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1156 struct dst_entry *dst;
1157 struct flowi6 fl6;
1158
1159 memset(&fl6, 0, sizeof(fl6));
1160 fl6.flowi6_oif = oif;
1161 fl6.flowi6_mark = mark;
1162 fl6.flowi6_flags = 0;
1163 fl6.daddr = iph->daddr;
1164 fl6.saddr = iph->saddr;
1165 fl6.flowlabel = ip6_flowinfo(iph);
1166
1167 dst = ip6_route_output(net, NULL, &fl6);
1168 if (!dst->error)
1169 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1170 dst_release(dst);
1171}
1172EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1173
1174void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1175{
1176 ip6_update_pmtu(skb, sock_net(sk), mtu,
1177 sk->sk_bound_dev_if, sk->sk_mark);
1178}
1179EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1180
1181void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1182{
1183 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1184 struct dst_entry *dst;
1185 struct flowi6 fl6;
1186
1187 memset(&fl6, 0, sizeof(fl6));
1188 fl6.flowi6_oif = oif;
1189 fl6.flowi6_mark = mark;
1190 fl6.flowi6_flags = 0;
1191 fl6.daddr = iph->daddr;
1192 fl6.saddr = iph->saddr;
1193 fl6.flowlabel = ip6_flowinfo(iph);
1194
1195 dst = ip6_route_output(net, NULL, &fl6);
1196 if (!dst->error)
1197 rt6_do_redirect(dst, NULL, skb);
1198 dst_release(dst);
1199}
1200EXPORT_SYMBOL_GPL(ip6_redirect);
1201
1202void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1203{
1204 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1205}
1206EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1207
1208static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1209{
1210 struct net_device *dev = dst->dev;
1211 unsigned int mtu = dst_mtu(dst);
1212 struct net *net = dev_net(dev);
1213
1214 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1215
1216 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1217 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1218
1219 /*
1220 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1221 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1222 * IPV6_MAXPLEN is also valid and means: "any MSS,
1223 * rely only on pmtu discovery"
1224 */
1225 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1226 mtu = IPV6_MAXPLEN;
1227 return mtu;
1228}
1229
1230static unsigned int ip6_mtu(const struct dst_entry *dst)
1231{
1232 struct inet6_dev *idev;
1233 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1234
1235 if (mtu)
1236 goto out;
1237
1238 mtu = IPV6_MIN_MTU;
1239
1240 rcu_read_lock();
1241 idev = __in6_dev_get(dst->dev);
1242 if (idev)
1243 mtu = idev->cnf.mtu6;
1244 rcu_read_unlock();
1245
1246out:
1247 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1248}
1249
1250static struct dst_entry *icmp6_dst_gc_list;
1251static DEFINE_SPINLOCK(icmp6_dst_lock);
1252
1253struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1254 struct flowi6 *fl6)
1255{
1256 struct dst_entry *dst;
1257 struct rt6_info *rt;
1258 struct inet6_dev *idev = in6_dev_get(dev);
1259 struct net *net = dev_net(dev);
1260
1261 if (unlikely(!idev))
1262 return ERR_PTR(-ENODEV);
1263
1264 rt = ip6_dst_alloc(net, dev, 0, NULL);
1265 if (unlikely(!rt)) {
1266 in6_dev_put(idev);
1267 dst = ERR_PTR(-ENOMEM);
1268 goto out;
1269 }
1270
1271 rt->dst.flags |= DST_HOST;
1272 rt->dst.output = ip6_output;
1273 atomic_set(&rt->dst.__refcnt, 1);
1274 rt->rt6i_gateway = fl6->daddr;
1275 rt->rt6i_dst.addr = fl6->daddr;
1276 rt->rt6i_dst.plen = 128;
1277 rt->rt6i_idev = idev;
1278 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1279
1280 spin_lock_bh(&icmp6_dst_lock);
1281 rt->dst.next = icmp6_dst_gc_list;
1282 icmp6_dst_gc_list = &rt->dst;
1283 spin_unlock_bh(&icmp6_dst_lock);
1284
1285 fib6_force_start_gc(net);
1286
1287 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1288
1289out:
1290 return dst;
1291}
1292
1293int icmp6_dst_gc(void)
1294{
1295 struct dst_entry *dst, **pprev;
1296 int more = 0;
1297
1298 spin_lock_bh(&icmp6_dst_lock);
1299 pprev = &icmp6_dst_gc_list;
1300
1301 while ((dst = *pprev) != NULL) {
1302 if (!atomic_read(&dst->__refcnt)) {
1303 *pprev = dst->next;
1304 dst_free(dst);
1305 } else {
1306 pprev = &dst->next;
1307 ++more;
1308 }
1309 }
1310
1311 spin_unlock_bh(&icmp6_dst_lock);
1312
1313 return more;
1314}
1315
1316static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1317 void *arg)
1318{
1319 struct dst_entry *dst, **pprev;
1320
1321 spin_lock_bh(&icmp6_dst_lock);
1322 pprev = &icmp6_dst_gc_list;
1323 while ((dst = *pprev) != NULL) {
1324 struct rt6_info *rt = (struct rt6_info *) dst;
1325 if (func(rt, arg)) {
1326 *pprev = dst->next;
1327 dst_free(dst);
1328 } else {
1329 pprev = &dst->next;
1330 }
1331 }
1332 spin_unlock_bh(&icmp6_dst_lock);
1333}
1334
1335static int ip6_dst_gc(struct dst_ops *ops)
1336{
1337 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1338 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1339 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1340 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1341 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1342 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1343 int entries;
1344
1345 entries = dst_entries_get_fast(ops);
1346 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1347 entries <= rt_max_size)
1348 goto out;
1349
1350 net->ipv6.ip6_rt_gc_expire++;
1351 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size);
1352 entries = dst_entries_get_slow(ops);
1353 if (entries < ops->gc_thresh)
1354 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1355out:
1356 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1357 return entries > rt_max_size;
1358}
1359
1360int ip6_dst_hoplimit(struct dst_entry *dst)
1361{
1362 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
1363 if (hoplimit == 0) {
1364 struct net_device *dev = dst->dev;
1365 struct inet6_dev *idev;
1366
1367 rcu_read_lock();
1368 idev = __in6_dev_get(dev);
1369 if (idev)
1370 hoplimit = idev->cnf.hop_limit;
1371 else
1372 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
1373 rcu_read_unlock();
1374 }
1375 return hoplimit;
1376}
1377EXPORT_SYMBOL(ip6_dst_hoplimit);
1378
1379/*
1380 *
1381 */
1382
1383int ip6_route_add(struct fib6_config *cfg)
1384{
1385 int err;
1386 struct net *net = cfg->fc_nlinfo.nl_net;
1387 struct rt6_info *rt = NULL;
1388 struct net_device *dev = NULL;
1389 struct inet6_dev *idev = NULL;
1390 struct fib6_table *table;
1391 int addr_type;
1392
1393 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1394 return -EINVAL;
1395#ifndef CONFIG_IPV6_SUBTREES
1396 if (cfg->fc_src_len)
1397 return -EINVAL;
1398#endif
1399 if (cfg->fc_ifindex) {
1400 err = -ENODEV;
1401 dev = dev_get_by_index(net, cfg->fc_ifindex);
1402 if (!dev)
1403 goto out;
1404 idev = in6_dev_get(dev);
1405 if (!idev)
1406 goto out;
1407 }
1408
1409 if (cfg->fc_metric == 0)
1410 cfg->fc_metric = IP6_RT_PRIO_USER;
1411
1412 err = -ENOBUFS;
1413 if (cfg->fc_nlinfo.nlh &&
1414 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1415 table = fib6_get_table(net, cfg->fc_table);
1416 if (!table) {
1417 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1418 table = fib6_new_table(net, cfg->fc_table);
1419 }
1420 } else {
1421 table = fib6_new_table(net, cfg->fc_table);
1422 }
1423
1424 if (!table)
1425 goto out;
1426
1427 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1428
1429 if (!rt) {
1430 err = -ENOMEM;
1431 goto out;
1432 }
1433
1434 if (cfg->fc_flags & RTF_EXPIRES)
1435 rt6_set_expires(rt, jiffies +
1436 clock_t_to_jiffies(cfg->fc_expires));
1437 else
1438 rt6_clean_expires(rt);
1439
1440 if (cfg->fc_protocol == RTPROT_UNSPEC)
1441 cfg->fc_protocol = RTPROT_BOOT;
1442 rt->rt6i_protocol = cfg->fc_protocol;
1443
1444 addr_type = ipv6_addr_type(&cfg->fc_dst);
1445
1446 if (addr_type & IPV6_ADDR_MULTICAST)
1447 rt->dst.input = ip6_mc_input;
1448 else if (cfg->fc_flags & RTF_LOCAL)
1449 rt->dst.input = ip6_input;
1450 else
1451 rt->dst.input = ip6_forward;
1452
1453 rt->dst.output = ip6_output;
1454
1455 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1456 rt->rt6i_dst.plen = cfg->fc_dst_len;
1457 if (rt->rt6i_dst.plen == 128)
1458 rt->dst.flags |= DST_HOST;
1459
1460 if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
1461 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1462 if (!metrics) {
1463 err = -ENOMEM;
1464 goto out;
1465 }
1466 dst_init_metrics(&rt->dst, metrics, 0);
1467 }
1468#ifdef CONFIG_IPV6_SUBTREES
1469 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1470 rt->rt6i_src.plen = cfg->fc_src_len;
1471#endif
1472
1473 rt->rt6i_metric = cfg->fc_metric;
1474
1475 /* We cannot add true routes via loopback here,
1476 they would result in kernel looping; promote them to reject routes
1477 */
1478 if ((cfg->fc_flags & RTF_REJECT) ||
1479 (dev && (dev->flags & IFF_LOOPBACK) &&
1480 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1481 !(cfg->fc_flags & RTF_LOCAL))) {
1482 /* hold loopback dev/idev if we haven't done so. */
1483 if (dev != net->loopback_dev) {
1484 if (dev) {
1485 dev_put(dev);
1486 in6_dev_put(idev);
1487 }
1488 dev = net->loopback_dev;
1489 dev_hold(dev);
1490 idev = in6_dev_get(dev);
1491 if (!idev) {
1492 err = -ENODEV;
1493 goto out;
1494 }
1495 }
1496 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1497 switch (cfg->fc_type) {
1498 case RTN_BLACKHOLE:
1499 rt->dst.error = -EINVAL;
1500 rt->dst.output = dst_discard;
1501 rt->dst.input = dst_discard;
1502 break;
1503 case RTN_PROHIBIT:
1504 rt->dst.error = -EACCES;
1505 rt->dst.output = ip6_pkt_prohibit_out;
1506 rt->dst.input = ip6_pkt_prohibit;
1507 break;
1508 case RTN_THROW:
1509 default:
1510 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1511 : -ENETUNREACH;
1512 rt->dst.output = ip6_pkt_discard_out;
1513 rt->dst.input = ip6_pkt_discard;
1514 break;
1515 }
1516 goto install_route;
1517 }
1518
1519 if (cfg->fc_flags & RTF_GATEWAY) {
1520 const struct in6_addr *gw_addr;
1521 int gwa_type;
1522
1523 gw_addr = &cfg->fc_gateway;
1524 rt->rt6i_gateway = *gw_addr;
1525 gwa_type = ipv6_addr_type(gw_addr);
1526
1527 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1528 struct rt6_info *grt;
1529
1530 /* IPv6 strictly inhibits using not link-local
1531 addresses as nexthop address.
1532 Otherwise, router will not able to send redirects.
1533 It is very good, but in some (rare!) circumstances
1534 (SIT, PtP, NBMA NOARP links) it is handy to allow
1535 some exceptions. --ANK
1536 */
1537 err = -EINVAL;
1538 if (!(gwa_type & IPV6_ADDR_UNICAST))
1539 goto out;
1540
1541 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1542
1543 err = -EHOSTUNREACH;
1544 if (!grt)
1545 goto out;
1546 if (dev) {
1547 if (dev != grt->dst.dev) {
1548 ip6_rt_put(grt);
1549 goto out;
1550 }
1551 } else {
1552 dev = grt->dst.dev;
1553 idev = grt->rt6i_idev;
1554 dev_hold(dev);
1555 in6_dev_hold(grt->rt6i_idev);
1556 }
1557 if (!(grt->rt6i_flags & RTF_GATEWAY))
1558 err = 0;
1559 ip6_rt_put(grt);
1560
1561 if (err)
1562 goto out;
1563 }
1564 err = -EINVAL;
1565 if (!dev || (dev->flags & IFF_LOOPBACK))
1566 goto out;
1567 }
1568
1569 err = -ENODEV;
1570 if (!dev)
1571 goto out;
1572
1573 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1574 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1575 err = -EINVAL;
1576 goto out;
1577 }
1578 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1579 rt->rt6i_prefsrc.plen = 128;
1580 } else
1581 rt->rt6i_prefsrc.plen = 0;
1582
1583 rt->rt6i_flags = cfg->fc_flags;
1584
1585install_route:
1586 if (cfg->fc_mx) {
1587 struct nlattr *nla;
1588 int remaining;
1589
1590 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1591 int type = nla_type(nla);
1592
1593 if (type) {
1594 if (type > RTAX_MAX) {
1595 err = -EINVAL;
1596 goto out;
1597 }
1598
1599 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1600 }
1601 }
1602 }
1603
1604 rt->dst.dev = dev;
1605 rt->rt6i_idev = idev;
1606 rt->rt6i_table = table;
1607
1608 cfg->fc_nlinfo.nl_net = dev_net(dev);
1609
1610 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1611
1612out:
1613 if (dev)
1614 dev_put(dev);
1615 if (idev)
1616 in6_dev_put(idev);
1617 if (rt)
1618 dst_free(&rt->dst);
1619 return err;
1620}
1621
1622static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1623{
1624 int err;
1625 struct fib6_table *table;
1626 struct net *net = dev_net(rt->dst.dev);
1627
1628 if (rt == net->ipv6.ip6_null_entry) {
1629 err = -ENOENT;
1630 goto out;
1631 }
1632
1633 table = rt->rt6i_table;
1634 write_lock_bh(&table->tb6_lock);
1635 err = fib6_del(rt, info);
1636 write_unlock_bh(&table->tb6_lock);
1637
1638out:
1639 ip6_rt_put(rt);
1640 return err;
1641}
1642
1643int ip6_del_rt(struct rt6_info *rt)
1644{
1645 struct nl_info info = {
1646 .nl_net = dev_net(rt->dst.dev),
1647 };
1648 return __ip6_del_rt(rt, &info);
1649}
1650
1651static int ip6_route_del(struct fib6_config *cfg)
1652{
1653 struct fib6_table *table;
1654 struct fib6_node *fn;
1655 struct rt6_info *rt;
1656 int err = -ESRCH;
1657
1658 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1659 if (!table)
1660 return err;
1661
1662 read_lock_bh(&table->tb6_lock);
1663
1664 fn = fib6_locate(&table->tb6_root,
1665 &cfg->fc_dst, cfg->fc_dst_len,
1666 &cfg->fc_src, cfg->fc_src_len);
1667
1668 if (fn) {
1669 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1670 if (cfg->fc_ifindex &&
1671 (!rt->dst.dev ||
1672 rt->dst.dev->ifindex != cfg->fc_ifindex))
1673 continue;
1674 if (cfg->fc_flags & RTF_GATEWAY &&
1675 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1676 continue;
1677 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1678 continue;
1679 if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol)
1680 continue;
1681 dst_hold(&rt->dst);
1682 read_unlock_bh(&table->tb6_lock);
1683
1684 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1685 }
1686 }
1687 read_unlock_bh(&table->tb6_lock);
1688
1689 return err;
1690}
1691
1692static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1693{
1694 struct net *net = dev_net(skb->dev);
1695 struct netevent_redirect netevent;
1696 struct rt6_info *rt, *nrt = NULL;
1697 struct ndisc_options ndopts;
1698 struct inet6_dev *in6_dev;
1699 struct neighbour *neigh;
1700 struct rd_msg *msg;
1701 int optlen, on_link;
1702 u8 *lladdr;
1703
1704 optlen = skb->tail - skb->transport_header;
1705 optlen -= sizeof(*msg);
1706
1707 if (optlen < 0) {
1708 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1709 return;
1710 }
1711
1712 msg = (struct rd_msg *)icmp6_hdr(skb);
1713
1714 if (ipv6_addr_is_multicast(&msg->dest)) {
1715 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1716 return;
1717 }
1718
1719 on_link = 0;
1720 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1721 on_link = 1;
1722 } else if (ipv6_addr_type(&msg->target) !=
1723 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1724 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1725 return;
1726 }
1727
1728 in6_dev = __in6_dev_get(skb->dev);
1729 if (!in6_dev)
1730 return;
1731 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1732 return;
1733
1734 /* RFC2461 8.1:
1735 * The IP source address of the Redirect MUST be the same as the current
1736 * first-hop router for the specified ICMP Destination Address.
1737 */
1738
1739 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1740 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1741 return;
1742 }
1743
1744 lladdr = NULL;
1745 if (ndopts.nd_opts_tgt_lladdr) {
1746 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1747 skb->dev);
1748 if (!lladdr) {
1749 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1750 return;
1751 }
1752 }
1753
1754 rt = (struct rt6_info *) dst;
1755 if (rt == net->ipv6.ip6_null_entry) {
1756 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1757 return;
1758 }
1759
1760 /* Redirect received -> path was valid.
1761 * Look, redirects are sent only in response to data packets,
1762 * so that this nexthop apparently is reachable. --ANK
1763 */
1764 dst_confirm(&rt->dst);
1765
1766 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1767 if (!neigh)
1768 return;
1769
1770 /*
1771 * We have finally decided to accept it.
1772 */
1773
1774 neigh_update(neigh, lladdr, NUD_STALE,
1775 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1776 NEIGH_UPDATE_F_OVERRIDE|
1777 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1778 NEIGH_UPDATE_F_ISROUTER))
1779 );
1780
1781 nrt = ip6_rt_copy(rt, &msg->dest);
1782 if (!nrt)
1783 goto out;
1784
1785 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1786 if (on_link)
1787 nrt->rt6i_flags &= ~RTF_GATEWAY;
1788
1789 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1790
1791 if (ip6_ins_rt(nrt))
1792 goto out;
1793
1794 netevent.old = &rt->dst;
1795 netevent.new = &nrt->dst;
1796 netevent.daddr = &msg->dest;
1797 netevent.neigh = neigh;
1798 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1799
1800 if (rt->rt6i_flags & RTF_CACHE) {
1801 rt = (struct rt6_info *) dst_clone(&rt->dst);
1802 ip6_del_rt(rt);
1803 }
1804
1805out:
1806 neigh_release(neigh);
1807}
1808
1809/*
1810 * Misc support functions
1811 */
1812
1813static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1814 const struct in6_addr *dest)
1815{
1816 struct net *net = dev_net(ort->dst.dev);
1817 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1818 ort->rt6i_table);
1819
1820 if (rt) {
1821 rt->dst.input = ort->dst.input;
1822 rt->dst.output = ort->dst.output;
1823 rt->dst.flags |= DST_HOST;
1824
1825 rt->rt6i_dst.addr = *dest;
1826 rt->rt6i_dst.plen = 128;
1827 dst_copy_metrics(&rt->dst, &ort->dst);
1828 rt->dst.error = ort->dst.error;
1829 rt->rt6i_idev = ort->rt6i_idev;
1830 if (rt->rt6i_idev)
1831 in6_dev_hold(rt->rt6i_idev);
1832 rt->dst.lastuse = jiffies;
1833
1834 if (ort->rt6i_flags & RTF_GATEWAY)
1835 rt->rt6i_gateway = ort->rt6i_gateway;
1836 else
1837 rt->rt6i_gateway = *dest;
1838 rt->rt6i_flags = ort->rt6i_flags;
1839 rt6_set_from(rt, ort);
1840 rt->rt6i_metric = 0;
1841
1842#ifdef CONFIG_IPV6_SUBTREES
1843 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1844#endif
1845 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1846 rt->rt6i_table = ort->rt6i_table;
1847 }
1848 return rt;
1849}
1850
1851#ifdef CONFIG_IPV6_ROUTE_INFO
1852static struct rt6_info *rt6_get_route_info(struct net *net,
1853 const struct in6_addr *prefix, int prefixlen,
1854 const struct in6_addr *gwaddr, int ifindex)
1855{
1856 struct fib6_node *fn;
1857 struct rt6_info *rt = NULL;
1858 struct fib6_table *table;
1859
1860 table = fib6_get_table(net, RT6_TABLE_INFO);
1861 if (!table)
1862 return NULL;
1863
1864 read_lock_bh(&table->tb6_lock);
1865 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1866 if (!fn)
1867 goto out;
1868
1869 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1870 if (rt->dst.dev->ifindex != ifindex)
1871 continue;
1872 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1873 continue;
1874 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1875 continue;
1876 dst_hold(&rt->dst);
1877 break;
1878 }
1879out:
1880 read_unlock_bh(&table->tb6_lock);
1881 return rt;
1882}
1883
1884static struct rt6_info *rt6_add_route_info(struct net *net,
1885 const struct in6_addr *prefix, int prefixlen,
1886 const struct in6_addr *gwaddr, int ifindex,
1887 unsigned int pref)
1888{
1889 struct fib6_config cfg = {
1890 .fc_table = RT6_TABLE_INFO,
1891 .fc_metric = IP6_RT_PRIO_USER,
1892 .fc_ifindex = ifindex,
1893 .fc_dst_len = prefixlen,
1894 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1895 RTF_UP | RTF_PREF(pref),
1896 .fc_nlinfo.portid = 0,
1897 .fc_nlinfo.nlh = NULL,
1898 .fc_nlinfo.nl_net = net,
1899 };
1900
1901 cfg.fc_dst = *prefix;
1902 cfg.fc_gateway = *gwaddr;
1903
1904 /* We should treat it as a default route if prefix length is 0. */
1905 if (!prefixlen)
1906 cfg.fc_flags |= RTF_DEFAULT;
1907
1908 ip6_route_add(&cfg);
1909
1910 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1911}
1912#endif
1913
1914struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1915{
1916 struct rt6_info *rt;
1917 struct fib6_table *table;
1918
1919 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1920 if (!table)
1921 return NULL;
1922
1923 read_lock_bh(&table->tb6_lock);
1924 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1925 if (dev == rt->dst.dev &&
1926 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1927 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1928 break;
1929 }
1930 if (rt)
1931 dst_hold(&rt->dst);
1932 read_unlock_bh(&table->tb6_lock);
1933 return rt;
1934}
1935
1936struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1937 struct net_device *dev,
1938 unsigned int pref)
1939{
1940 struct fib6_config cfg = {
1941 .fc_table = RT6_TABLE_DFLT,
1942 .fc_metric = IP6_RT_PRIO_USER,
1943 .fc_ifindex = dev->ifindex,
1944 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1945 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1946 .fc_nlinfo.portid = 0,
1947 .fc_nlinfo.nlh = NULL,
1948 .fc_nlinfo.nl_net = dev_net(dev),
1949 };
1950
1951 cfg.fc_gateway = *gwaddr;
1952
1953 ip6_route_add(&cfg);
1954
1955 return rt6_get_dflt_router(gwaddr, dev);
1956}
1957
1958void rt6_purge_dflt_routers(struct net *net)
1959{
1960 struct rt6_info *rt;
1961 struct fib6_table *table;
1962
1963 /* NOTE: Keep consistent with rt6_get_dflt_router */
1964 table = fib6_get_table(net, RT6_TABLE_DFLT);
1965 if (!table)
1966 return;
1967
1968restart:
1969 read_lock_bh(&table->tb6_lock);
1970 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
1971 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
1972 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
1973 dst_hold(&rt->dst);
1974 read_unlock_bh(&table->tb6_lock);
1975 ip6_del_rt(rt);
1976 goto restart;
1977 }
1978 }
1979 read_unlock_bh(&table->tb6_lock);
1980}
1981
1982static void rtmsg_to_fib6_config(struct net *net,
1983 struct in6_rtmsg *rtmsg,
1984 struct fib6_config *cfg)
1985{
1986 memset(cfg, 0, sizeof(*cfg));
1987
1988 cfg->fc_table = RT6_TABLE_MAIN;
1989 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1990 cfg->fc_metric = rtmsg->rtmsg_metric;
1991 cfg->fc_expires = rtmsg->rtmsg_info;
1992 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1993 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1994 cfg->fc_flags = rtmsg->rtmsg_flags;
1995
1996 cfg->fc_nlinfo.nl_net = net;
1997
1998 cfg->fc_dst = rtmsg->rtmsg_dst;
1999 cfg->fc_src = rtmsg->rtmsg_src;
2000 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2001}
2002
2003int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2004{
2005 struct fib6_config cfg;
2006 struct in6_rtmsg rtmsg;
2007 int err;
2008
2009 switch(cmd) {
2010 case SIOCADDRT: /* Add a route */
2011 case SIOCDELRT: /* Delete a route */
2012 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2013 return -EPERM;
2014 err = copy_from_user(&rtmsg, arg,
2015 sizeof(struct in6_rtmsg));
2016 if (err)
2017 return -EFAULT;
2018
2019 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2020
2021 rtnl_lock();
2022 switch (cmd) {
2023 case SIOCADDRT:
2024 err = ip6_route_add(&cfg);
2025 break;
2026 case SIOCDELRT:
2027 err = ip6_route_del(&cfg);
2028 break;
2029 default:
2030 err = -EINVAL;
2031 }
2032 rtnl_unlock();
2033
2034 return err;
2035 }
2036
2037 return -EINVAL;
2038}
2039
2040/*
2041 * Drop the packet on the floor
2042 */
2043
2044static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2045{
2046 int type;
2047 struct dst_entry *dst = skb_dst(skb);
2048 switch (ipstats_mib_noroutes) {
2049 case IPSTATS_MIB_INNOROUTES:
2050 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2051 if (type == IPV6_ADDR_ANY) {
2052 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2053 IPSTATS_MIB_INADDRERRORS);
2054 break;
2055 }
2056 /* FALLTHROUGH */
2057 case IPSTATS_MIB_OUTNOROUTES:
2058 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2059 ipstats_mib_noroutes);
2060 break;
2061 }
2062 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2063 kfree_skb(skb);
2064 return 0;
2065}
2066
2067static int ip6_pkt_discard(struct sk_buff *skb)
2068{
2069 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2070}
2071
2072static int ip6_pkt_discard_out(struct sk_buff *skb)
2073{
2074 skb->dev = skb_dst(skb)->dev;
2075 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2076}
2077
2078static int ip6_pkt_prohibit(struct sk_buff *skb)
2079{
2080 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2081}
2082
2083static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2084{
2085 skb->dev = skb_dst(skb)->dev;
2086 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2087}
2088
2089/*
2090 * Allocate a dst for local (unicast / anycast) address.
2091 */
2092
2093struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2094 const struct in6_addr *addr,
2095 bool anycast)
2096{
2097 struct net *net = dev_net(idev->dev);
2098 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2099 DST_NOCOUNT, NULL);
2100 if (!rt)
2101 return ERR_PTR(-ENOMEM);
2102
2103 in6_dev_hold(idev);
2104
2105 rt->dst.flags |= DST_HOST;
2106 rt->dst.input = ip6_input;
2107 rt->dst.output = ip6_output;
2108 rt->rt6i_idev = idev;
2109
2110 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2111 if (anycast)
2112 rt->rt6i_flags |= RTF_ANYCAST;
2113 else
2114 rt->rt6i_flags |= RTF_LOCAL;
2115
2116 rt->rt6i_gateway = *addr;
2117 rt->rt6i_dst.addr = *addr;
2118 rt->rt6i_dst.plen = 128;
2119 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2120
2121 atomic_set(&rt->dst.__refcnt, 1);
2122
2123 return rt;
2124}
2125
2126int ip6_route_get_saddr(struct net *net,
2127 struct rt6_info *rt,
2128 const struct in6_addr *daddr,
2129 unsigned int prefs,
2130 struct in6_addr *saddr)
2131{
2132 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2133 int err = 0;
2134 if (rt->rt6i_prefsrc.plen)
2135 *saddr = rt->rt6i_prefsrc.addr;
2136 else
2137 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2138 daddr, prefs, saddr);
2139 return err;
2140}
2141
2142/* remove deleted ip from prefsrc entries */
2143struct arg_dev_net_ip {
2144 struct net_device *dev;
2145 struct net *net;
2146 struct in6_addr *addr;
2147};
2148
2149static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2150{
2151 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2152 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2153 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2154
2155 if (((void *)rt->dst.dev == dev || !dev) &&
2156 rt != net->ipv6.ip6_null_entry &&
2157 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2158 /* remove prefsrc entry */
2159 rt->rt6i_prefsrc.plen = 0;
2160 }
2161 return 0;
2162}
2163
2164void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2165{
2166 struct net *net = dev_net(ifp->idev->dev);
2167 struct arg_dev_net_ip adni = {
2168 .dev = ifp->idev->dev,
2169 .net = net,
2170 .addr = &ifp->addr,
2171 };
2172 fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2173}
2174
2175struct arg_dev_net {
2176 struct net_device *dev;
2177 struct net *net;
2178};
2179
2180static int fib6_ifdown(struct rt6_info *rt, void *arg)
2181{
2182 const struct arg_dev_net *adn = arg;
2183 const struct net_device *dev = adn->dev;
2184
2185 if ((rt->dst.dev == dev || !dev) &&
2186 rt != adn->net->ipv6.ip6_null_entry)
2187 return -1;
2188
2189 return 0;
2190}
2191
2192void rt6_ifdown(struct net *net, struct net_device *dev)
2193{
2194 struct arg_dev_net adn = {
2195 .dev = dev,
2196 .net = net,
2197 };
2198
2199 fib6_clean_all(net, fib6_ifdown, 0, &adn);
2200 icmp6_clean_all(fib6_ifdown, &adn);
2201}
2202
2203struct rt6_mtu_change_arg {
2204 struct net_device *dev;
2205 unsigned int mtu;
2206};
2207
2208static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2209{
2210 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2211 struct inet6_dev *idev;
2212
2213 /* In IPv6 pmtu discovery is not optional,
2214 so that RTAX_MTU lock cannot disable it.
2215 We still use this lock to block changes
2216 caused by addrconf/ndisc.
2217 */
2218
2219 idev = __in6_dev_get(arg->dev);
2220 if (!idev)
2221 return 0;
2222
2223 /* For administrative MTU increase, there is no way to discover
2224 IPv6 PMTU increase, so PMTU increase should be updated here.
2225 Since RFC 1981 doesn't include administrative MTU increase
2226 update PMTU increase is a MUST. (i.e. jumbo frame)
2227 */
2228 /*
2229 If new MTU is less than route PMTU, this new MTU will be the
2230 lowest MTU in the path, update the route PMTU to reflect PMTU
2231 decreases; if new MTU is greater than route PMTU, and the
2232 old MTU is the lowest MTU in the path, update the route PMTU
2233 to reflect the increase. In this case if the other nodes' MTU
2234 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2235 PMTU discouvery.
2236 */
2237 if (rt->dst.dev == arg->dev &&
2238 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2239 (dst_mtu(&rt->dst) >= arg->mtu ||
2240 (dst_mtu(&rt->dst) < arg->mtu &&
2241 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2242 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2243 }
2244 return 0;
2245}
2246
2247void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2248{
2249 struct rt6_mtu_change_arg arg = {
2250 .dev = dev,
2251 .mtu = mtu,
2252 };
2253
2254 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2255}
2256
2257static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2258 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2259 [RTA_OIF] = { .type = NLA_U32 },
2260 [RTA_IIF] = { .type = NLA_U32 },
2261 [RTA_PRIORITY] = { .type = NLA_U32 },
2262 [RTA_METRICS] = { .type = NLA_NESTED },
2263 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2264};
2265
2266static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2267 struct fib6_config *cfg)
2268{
2269 struct rtmsg *rtm;
2270 struct nlattr *tb[RTA_MAX+1];
2271 int err;
2272
2273 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2274 if (err < 0)
2275 goto errout;
2276
2277 err = -EINVAL;
2278 rtm = nlmsg_data(nlh);
2279 memset(cfg, 0, sizeof(*cfg));
2280
2281 cfg->fc_table = rtm->rtm_table;
2282 cfg->fc_dst_len = rtm->rtm_dst_len;
2283 cfg->fc_src_len = rtm->rtm_src_len;
2284 cfg->fc_flags = RTF_UP;
2285 cfg->fc_protocol = rtm->rtm_protocol;
2286 cfg->fc_type = rtm->rtm_type;
2287
2288 if (rtm->rtm_type == RTN_UNREACHABLE ||
2289 rtm->rtm_type == RTN_BLACKHOLE ||
2290 rtm->rtm_type == RTN_PROHIBIT ||
2291 rtm->rtm_type == RTN_THROW)
2292 cfg->fc_flags |= RTF_REJECT;
2293
2294 if (rtm->rtm_type == RTN_LOCAL)
2295 cfg->fc_flags |= RTF_LOCAL;
2296
2297 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2298 cfg->fc_nlinfo.nlh = nlh;
2299 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2300
2301 if (tb[RTA_GATEWAY]) {
2302 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2303 cfg->fc_flags |= RTF_GATEWAY;
2304 }
2305
2306 if (tb[RTA_DST]) {
2307 int plen = (rtm->rtm_dst_len + 7) >> 3;
2308
2309 if (nla_len(tb[RTA_DST]) < plen)
2310 goto errout;
2311
2312 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2313 }
2314
2315 if (tb[RTA_SRC]) {
2316 int plen = (rtm->rtm_src_len + 7) >> 3;
2317
2318 if (nla_len(tb[RTA_SRC]) < plen)
2319 goto errout;
2320
2321 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2322 }
2323
2324 if (tb[RTA_PREFSRC])
2325 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2326
2327 if (tb[RTA_OIF])
2328 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2329
2330 if (tb[RTA_PRIORITY])
2331 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2332
2333 if (tb[RTA_METRICS]) {
2334 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2335 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2336 }
2337
2338 if (tb[RTA_TABLE])
2339 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2340
2341 if (tb[RTA_MULTIPATH]) {
2342 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2343 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2344 }
2345
2346 err = 0;
2347errout:
2348 return err;
2349}
2350
2351static int ip6_route_multipath(struct fib6_config *cfg, int add)
2352{
2353 struct fib6_config r_cfg;
2354 struct rtnexthop *rtnh;
2355 int remaining;
2356 int attrlen;
2357 int err = 0, last_err = 0;
2358
2359beginning:
2360 rtnh = (struct rtnexthop *)cfg->fc_mp;
2361 remaining = cfg->fc_mp_len;
2362
2363 /* Parse a Multipath Entry */
2364 while (rtnh_ok(rtnh, remaining)) {
2365 memcpy(&r_cfg, cfg, sizeof(*cfg));
2366 if (rtnh->rtnh_ifindex)
2367 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2368
2369 attrlen = rtnh_attrlen(rtnh);
2370 if (attrlen > 0) {
2371 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2372
2373 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2374 if (nla) {
2375 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2376 r_cfg.fc_flags |= RTF_GATEWAY;
2377 }
2378 }
2379 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2380 if (err) {
2381 last_err = err;
2382 /* If we are trying to remove a route, do not stop the
2383 * loop when ip6_route_del() fails (because next hop is
2384 * already gone), we should try to remove all next hops.
2385 */
2386 if (add) {
2387 /* If add fails, we should try to delete all
2388 * next hops that have been already added.
2389 */
2390 add = 0;
2391 goto beginning;
2392 }
2393 }
2394 /* Because each route is added like a single route we remove
2395 * this flag after the first nexthop (if there is a collision,
2396 * we have already fail to add the first nexthop:
2397 * fib6_add_rt2node() has reject it).
2398 */
2399 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2400 rtnh = rtnh_next(rtnh, &remaining);
2401 }
2402
2403 return last_err;
2404}
2405
2406static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2407{
2408 struct fib6_config cfg;
2409 int err;
2410
2411 err = rtm_to_fib6_config(skb, nlh, &cfg);
2412 if (err < 0)
2413 return err;
2414
2415 if (cfg.fc_mp)
2416 return ip6_route_multipath(&cfg, 0);
2417 else
2418 return ip6_route_del(&cfg);
2419}
2420
2421static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2422{
2423 struct fib6_config cfg;
2424 int err;
2425
2426 err = rtm_to_fib6_config(skb, nlh, &cfg);
2427 if (err < 0)
2428 return err;
2429
2430 if (cfg.fc_mp)
2431 return ip6_route_multipath(&cfg, 1);
2432 else
2433 return ip6_route_add(&cfg);
2434}
2435
2436static inline size_t rt6_nlmsg_size(void)
2437{
2438 return NLMSG_ALIGN(sizeof(struct rtmsg))
2439 + nla_total_size(16) /* RTA_SRC */
2440 + nla_total_size(16) /* RTA_DST */
2441 + nla_total_size(16) /* RTA_GATEWAY */
2442 + nla_total_size(16) /* RTA_PREFSRC */
2443 + nla_total_size(4) /* RTA_TABLE */
2444 + nla_total_size(4) /* RTA_IIF */
2445 + nla_total_size(4) /* RTA_OIF */
2446 + nla_total_size(4) /* RTA_PRIORITY */
2447 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2448 + nla_total_size(sizeof(struct rta_cacheinfo));
2449}
2450
2451static int rt6_fill_node(struct net *net,
2452 struct sk_buff *skb, struct rt6_info *rt,
2453 struct in6_addr *dst, struct in6_addr *src,
2454 int iif, int type, u32 portid, u32 seq,
2455 int prefix, int nowait, unsigned int flags)
2456{
2457 struct rtmsg *rtm;
2458 struct nlmsghdr *nlh;
2459 long expires;
2460 u32 table;
2461
2462 if (prefix) { /* user wants prefix routes only */
2463 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2464 /* success since this is not a prefix route */
2465 return 1;
2466 }
2467 }
2468
2469 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2470 if (!nlh)
2471 return -EMSGSIZE;
2472
2473 rtm = nlmsg_data(nlh);
2474 rtm->rtm_family = AF_INET6;
2475 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2476 rtm->rtm_src_len = rt->rt6i_src.plen;
2477 rtm->rtm_tos = 0;
2478 if (rt->rt6i_table)
2479 table = rt->rt6i_table->tb6_id;
2480 else
2481 table = RT6_TABLE_UNSPEC;
2482 rtm->rtm_table = table;
2483 if (nla_put_u32(skb, RTA_TABLE, table))
2484 goto nla_put_failure;
2485 if (rt->rt6i_flags & RTF_REJECT) {
2486 switch (rt->dst.error) {
2487 case -EINVAL:
2488 rtm->rtm_type = RTN_BLACKHOLE;
2489 break;
2490 case -EACCES:
2491 rtm->rtm_type = RTN_PROHIBIT;
2492 break;
2493 case -EAGAIN:
2494 rtm->rtm_type = RTN_THROW;
2495 break;
2496 default:
2497 rtm->rtm_type = RTN_UNREACHABLE;
2498 break;
2499 }
2500 }
2501 else if (rt->rt6i_flags & RTF_LOCAL)
2502 rtm->rtm_type = RTN_LOCAL;
2503 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2504 rtm->rtm_type = RTN_LOCAL;
2505 else
2506 rtm->rtm_type = RTN_UNICAST;
2507 rtm->rtm_flags = 0;
2508 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2509 rtm->rtm_protocol = rt->rt6i_protocol;
2510 if (rt->rt6i_flags & RTF_DYNAMIC)
2511 rtm->rtm_protocol = RTPROT_REDIRECT;
2512 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2513 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2514 rtm->rtm_protocol = RTPROT_RA;
2515 else
2516 rtm->rtm_protocol = RTPROT_KERNEL;
2517 }
2518
2519 if (rt->rt6i_flags & RTF_CACHE)
2520 rtm->rtm_flags |= RTM_F_CLONED;
2521
2522 if (dst) {
2523 if (nla_put(skb, RTA_DST, 16, dst))
2524 goto nla_put_failure;
2525 rtm->rtm_dst_len = 128;
2526 } else if (rtm->rtm_dst_len)
2527 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2528 goto nla_put_failure;
2529#ifdef CONFIG_IPV6_SUBTREES
2530 if (src) {
2531 if (nla_put(skb, RTA_SRC, 16, src))
2532 goto nla_put_failure;
2533 rtm->rtm_src_len = 128;
2534 } else if (rtm->rtm_src_len &&
2535 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2536 goto nla_put_failure;
2537#endif
2538 if (iif) {
2539#ifdef CONFIG_IPV6_MROUTE
2540 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2541 int err = ip6mr_get_route(net, skb, rtm, nowait,
2542 portid);
2543
2544 if (err <= 0) {
2545 if (!nowait) {
2546 if (err == 0)
2547 return 0;
2548 goto nla_put_failure;
2549 } else {
2550 if (err == -EMSGSIZE)
2551 goto nla_put_failure;
2552 }
2553 }
2554 } else
2555#endif
2556 if (nla_put_u32(skb, RTA_IIF, iif))
2557 goto nla_put_failure;
2558 } else if (dst) {
2559 struct in6_addr saddr_buf;
2560 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2561 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2562 goto nla_put_failure;
2563 }
2564
2565 if (rt->rt6i_prefsrc.plen) {
2566 struct in6_addr saddr_buf;
2567 saddr_buf = rt->rt6i_prefsrc.addr;
2568 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2569 goto nla_put_failure;
2570 }
2571
2572 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2573 goto nla_put_failure;
2574
2575 if (rt->rt6i_flags & RTF_GATEWAY) {
2576 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2577 goto nla_put_failure;
2578 }
2579
2580 if (rt->dst.dev &&
2581 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2582 goto nla_put_failure;
2583 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2584 goto nla_put_failure;
2585
2586 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2587
2588 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2589 goto nla_put_failure;
2590
2591 return nlmsg_end(skb, nlh);
2592
2593nla_put_failure:
2594 nlmsg_cancel(skb, nlh);
2595 return -EMSGSIZE;
2596}
2597
2598int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2599{
2600 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2601 int prefix;
2602
2603 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2604 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2605 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2606 } else
2607 prefix = 0;
2608
2609 return rt6_fill_node(arg->net,
2610 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2611 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2612 prefix, 0, NLM_F_MULTI);
2613}
2614
2615static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2616{
2617 struct net *net = sock_net(in_skb->sk);
2618 struct nlattr *tb[RTA_MAX+1];
2619 struct rt6_info *rt;
2620 struct sk_buff *skb;
2621 struct rtmsg *rtm;
2622 struct flowi6 fl6;
2623 int err, iif = 0, oif = 0;
2624
2625 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2626 if (err < 0)
2627 goto errout;
2628
2629 err = -EINVAL;
2630 memset(&fl6, 0, sizeof(fl6));
2631
2632 if (tb[RTA_SRC]) {
2633 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2634 goto errout;
2635
2636 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2637 }
2638
2639 if (tb[RTA_DST]) {
2640 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2641 goto errout;
2642
2643 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2644 }
2645
2646 if (tb[RTA_IIF])
2647 iif = nla_get_u32(tb[RTA_IIF]);
2648
2649 if (tb[RTA_OIF])
2650 oif = nla_get_u32(tb[RTA_OIF]);
2651
2652 if (iif) {
2653 struct net_device *dev;
2654 int flags = 0;
2655
2656 dev = __dev_get_by_index(net, iif);
2657 if (!dev) {
2658 err = -ENODEV;
2659 goto errout;
2660 }
2661
2662 fl6.flowi6_iif = iif;
2663
2664 if (!ipv6_addr_any(&fl6.saddr))
2665 flags |= RT6_LOOKUP_F_HAS_SADDR;
2666
2667 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2668 flags);
2669 } else {
2670 fl6.flowi6_oif = oif;
2671
2672 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2673 }
2674
2675 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2676 if (!skb) {
2677 ip6_rt_put(rt);
2678 err = -ENOBUFS;
2679 goto errout;
2680 }
2681
2682 /* Reserve room for dummy headers, this skb can pass
2683 through good chunk of routing engine.
2684 */
2685 skb_reset_mac_header(skb);
2686 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2687
2688 skb_dst_set(skb, &rt->dst);
2689
2690 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2691 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2692 nlh->nlmsg_seq, 0, 0, 0);
2693 if (err < 0) {
2694 kfree_skb(skb);
2695 goto errout;
2696 }
2697
2698 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2699errout:
2700 return err;
2701}
2702
2703void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2704{
2705 struct sk_buff *skb;
2706 struct net *net = info->nl_net;
2707 u32 seq;
2708 int err;
2709
2710 err = -ENOBUFS;
2711 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2712
2713 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2714 if (!skb)
2715 goto errout;
2716
2717 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2718 event, info->portid, seq, 0, 0, 0);
2719 if (err < 0) {
2720 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2721 WARN_ON(err == -EMSGSIZE);
2722 kfree_skb(skb);
2723 goto errout;
2724 }
2725 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2726 info->nlh, gfp_any());
2727 return;
2728errout:
2729 if (err < 0)
2730 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2731}
2732
2733static int ip6_route_dev_notify(struct notifier_block *this,
2734 unsigned long event, void *data)
2735{
2736 struct net_device *dev = (struct net_device *)data;
2737 struct net *net = dev_net(dev);
2738
2739 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2740 net->ipv6.ip6_null_entry->dst.dev = dev;
2741 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2742#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2743 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2744 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2745 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2746 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2747#endif
2748 }
2749
2750 return NOTIFY_OK;
2751}
2752
2753/*
2754 * /proc
2755 */
2756
2757#ifdef CONFIG_PROC_FS
2758
2759struct rt6_proc_arg
2760{
2761 char *buffer;
2762 int offset;
2763 int length;
2764 int skip;
2765 int len;
2766};
2767
2768static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2769{
2770 struct seq_file *m = p_arg;
2771
2772 seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
2773
2774#ifdef CONFIG_IPV6_SUBTREES
2775 seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
2776#else
2777 seq_puts(m, "00000000000000000000000000000000 00 ");
2778#endif
2779 if (rt->rt6i_flags & RTF_GATEWAY) {
2780 seq_printf(m, "%pi6", &rt->rt6i_gateway);
2781 } else {
2782 seq_puts(m, "00000000000000000000000000000000");
2783 }
2784 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2785 rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
2786 rt->dst.__use, rt->rt6i_flags,
2787 rt->dst.dev ? rt->dst.dev->name : "");
2788 return 0;
2789}
2790
2791static int ipv6_route_show(struct seq_file *m, void *v)
2792{
2793 struct net *net = (struct net *)m->private;
2794 fib6_clean_all_ro(net, rt6_info_route, 0, m);
2795 return 0;
2796}
2797
2798static int ipv6_route_open(struct inode *inode, struct file *file)
2799{
2800 return single_open_net(inode, file, ipv6_route_show);
2801}
2802
2803static const struct file_operations ipv6_route_proc_fops = {
2804 .owner = THIS_MODULE,
2805 .open = ipv6_route_open,
2806 .read = seq_read,
2807 .llseek = seq_lseek,
2808 .release = single_release_net,
2809};
2810
2811static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2812{
2813 struct net *net = (struct net *)seq->private;
2814 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2815 net->ipv6.rt6_stats->fib_nodes,
2816 net->ipv6.rt6_stats->fib_route_nodes,
2817 net->ipv6.rt6_stats->fib_rt_alloc,
2818 net->ipv6.rt6_stats->fib_rt_entries,
2819 net->ipv6.rt6_stats->fib_rt_cache,
2820 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2821 net->ipv6.rt6_stats->fib_discarded_routes);
2822
2823 return 0;
2824}
2825
2826static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2827{
2828 return single_open_net(inode, file, rt6_stats_seq_show);
2829}
2830
2831static const struct file_operations rt6_stats_seq_fops = {
2832 .owner = THIS_MODULE,
2833 .open = rt6_stats_seq_open,
2834 .read = seq_read,
2835 .llseek = seq_lseek,
2836 .release = single_release_net,
2837};
2838#endif /* CONFIG_PROC_FS */
2839
2840#ifdef CONFIG_SYSCTL
2841
2842static
2843int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write,
2844 void __user *buffer, size_t *lenp, loff_t *ppos)
2845{
2846 struct net *net;
2847 int delay;
2848 if (!write)
2849 return -EINVAL;
2850
2851 net = (struct net *)ctl->extra1;
2852 delay = net->ipv6.sysctl.flush_delay;
2853 proc_dointvec(ctl, write, buffer, lenp, ppos);
2854 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
2855 return 0;
2856}
2857
2858ctl_table ipv6_route_table_template[] = {
2859 {
2860 .procname = "flush",
2861 .data = &init_net.ipv6.sysctl.flush_delay,
2862 .maxlen = sizeof(int),
2863 .mode = 0200,
2864 .proc_handler = ipv6_sysctl_rtcache_flush
2865 },
2866 {
2867 .procname = "gc_thresh",
2868 .data = &ip6_dst_ops_template.gc_thresh,
2869 .maxlen = sizeof(int),
2870 .mode = 0644,
2871 .proc_handler = proc_dointvec,
2872 },
2873 {
2874 .procname = "max_size",
2875 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2876 .maxlen = sizeof(int),
2877 .mode = 0644,
2878 .proc_handler = proc_dointvec,
2879 },
2880 {
2881 .procname = "gc_min_interval",
2882 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2883 .maxlen = sizeof(int),
2884 .mode = 0644,
2885 .proc_handler = proc_dointvec_jiffies,
2886 },
2887 {
2888 .procname = "gc_timeout",
2889 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2890 .maxlen = sizeof(int),
2891 .mode = 0644,
2892 .proc_handler = proc_dointvec_jiffies,
2893 },
2894 {
2895 .procname = "gc_interval",
2896 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2897 .maxlen = sizeof(int),
2898 .mode = 0644,
2899 .proc_handler = proc_dointvec_jiffies,
2900 },
2901 {
2902 .procname = "gc_elasticity",
2903 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2904 .maxlen = sizeof(int),
2905 .mode = 0644,
2906 .proc_handler = proc_dointvec,
2907 },
2908 {
2909 .procname = "mtu_expires",
2910 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2911 .maxlen = sizeof(int),
2912 .mode = 0644,
2913 .proc_handler = proc_dointvec_jiffies,
2914 },
2915 {
2916 .procname = "min_adv_mss",
2917 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2918 .maxlen = sizeof(int),
2919 .mode = 0644,
2920 .proc_handler = proc_dointvec,
2921 },
2922 {
2923 .procname = "gc_min_interval_ms",
2924 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2925 .maxlen = sizeof(int),
2926 .mode = 0644,
2927 .proc_handler = proc_dointvec_ms_jiffies,
2928 },
2929 { }
2930};
2931
2932struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2933{
2934 struct ctl_table *table;
2935
2936 table = kmemdup(ipv6_route_table_template,
2937 sizeof(ipv6_route_table_template),
2938 GFP_KERNEL);
2939
2940 if (table) {
2941 table[0].data = &net->ipv6.sysctl.flush_delay;
2942 table[0].extra1 = net;
2943 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2944 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2945 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2946 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2947 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2948 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2949 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2950 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2951 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2952
2953 /* Don't export sysctls to unprivileged users */
2954 if (net->user_ns != &init_user_ns)
2955 table[0].procname = NULL;
2956 }
2957
2958 return table;
2959}
2960#endif
2961
2962static int __net_init ip6_route_net_init(struct net *net)
2963{
2964 int ret = -ENOMEM;
2965
2966 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2967 sizeof(net->ipv6.ip6_dst_ops));
2968
2969 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2970 goto out_ip6_dst_ops;
2971
2972 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2973 sizeof(*net->ipv6.ip6_null_entry),
2974 GFP_KERNEL);
2975 if (!net->ipv6.ip6_null_entry)
2976 goto out_ip6_dst_entries;
2977 net->ipv6.ip6_null_entry->dst.path =
2978 (struct dst_entry *)net->ipv6.ip6_null_entry;
2979 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2980 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
2981 ip6_template_metrics, true);
2982
2983#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2984 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2985 sizeof(*net->ipv6.ip6_prohibit_entry),
2986 GFP_KERNEL);
2987 if (!net->ipv6.ip6_prohibit_entry)
2988 goto out_ip6_null_entry;
2989 net->ipv6.ip6_prohibit_entry->dst.path =
2990 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
2991 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2992 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
2993 ip6_template_metrics, true);
2994
2995 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
2996 sizeof(*net->ipv6.ip6_blk_hole_entry),
2997 GFP_KERNEL);
2998 if (!net->ipv6.ip6_blk_hole_entry)
2999 goto out_ip6_prohibit_entry;
3000 net->ipv6.ip6_blk_hole_entry->dst.path =
3001 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3002 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3003 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3004 ip6_template_metrics, true);
3005#endif
3006
3007 net->ipv6.sysctl.flush_delay = 0;
3008 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3009 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3010 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3011 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3012 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3013 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3014 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3015
3016 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3017
3018 ret = 0;
3019out:
3020 return ret;
3021
3022#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3023out_ip6_prohibit_entry:
3024 kfree(net->ipv6.ip6_prohibit_entry);
3025out_ip6_null_entry:
3026 kfree(net->ipv6.ip6_null_entry);
3027#endif
3028out_ip6_dst_entries:
3029 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3030out_ip6_dst_ops:
3031 goto out;
3032}
3033
3034static void __net_exit ip6_route_net_exit(struct net *net)
3035{
3036 kfree(net->ipv6.ip6_null_entry);
3037#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3038 kfree(net->ipv6.ip6_prohibit_entry);
3039 kfree(net->ipv6.ip6_blk_hole_entry);
3040#endif
3041 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3042}
3043
3044static int __net_init ip6_route_net_init_late(struct net *net)
3045{
3046#ifdef CONFIG_PROC_FS
3047 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3048 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3049#endif
3050 return 0;
3051}
3052
3053static void __net_exit ip6_route_net_exit_late(struct net *net)
3054{
3055#ifdef CONFIG_PROC_FS
3056 remove_proc_entry("ipv6_route", net->proc_net);
3057 remove_proc_entry("rt6_stats", net->proc_net);
3058#endif
3059}
3060
3061static struct pernet_operations ip6_route_net_ops = {
3062 .init = ip6_route_net_init,
3063 .exit = ip6_route_net_exit,
3064};
3065
3066static int __net_init ipv6_inetpeer_init(struct net *net)
3067{
3068 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3069
3070 if (!bp)
3071 return -ENOMEM;
3072 inet_peer_base_init(bp);
3073 net->ipv6.peers = bp;
3074 return 0;
3075}
3076
3077static void __net_exit ipv6_inetpeer_exit(struct net *net)
3078{
3079 struct inet_peer_base *bp = net->ipv6.peers;
3080
3081 net->ipv6.peers = NULL;
3082 inetpeer_invalidate_tree(bp);
3083 kfree(bp);
3084}
3085
3086static struct pernet_operations ipv6_inetpeer_ops = {
3087 .init = ipv6_inetpeer_init,
3088 .exit = ipv6_inetpeer_exit,
3089};
3090
3091static struct pernet_operations ip6_route_net_late_ops = {
3092 .init = ip6_route_net_init_late,
3093 .exit = ip6_route_net_exit_late,
3094};
3095
3096static struct notifier_block ip6_route_dev_notifier = {
3097 .notifier_call = ip6_route_dev_notify,
3098 .priority = 0,
3099};
3100
3101int __init ip6_route_init(void)
3102{
3103 int ret;
3104
3105 ret = -ENOMEM;
3106 ip6_dst_ops_template.kmem_cachep =
3107 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3108 SLAB_HWCACHE_ALIGN, NULL);
3109 if (!ip6_dst_ops_template.kmem_cachep)
3110 goto out;
3111
3112 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3113 if (ret)
3114 goto out_kmem_cache;
3115
3116 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3117 if (ret)
3118 goto out_dst_entries;
3119
3120 ret = register_pernet_subsys(&ip6_route_net_ops);
3121 if (ret)
3122 goto out_register_inetpeer;
3123
3124 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3125
3126 /* Registering of the loopback is done before this portion of code,
3127 * the loopback reference in rt6_info will not be taken, do it
3128 * manually for init_net */
3129 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3130 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3131 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3132 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3133 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3134 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3135 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3136 #endif
3137 ret = fib6_init();
3138 if (ret)
3139 goto out_register_subsys;
3140
3141 ret = xfrm6_init();
3142 if (ret)
3143 goto out_fib6_init;
3144
3145 ret = fib6_rules_init();
3146 if (ret)
3147 goto xfrm6_init;
3148
3149 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3150 if (ret)
3151 goto fib6_rules_init;
3152
3153 ret = -ENOBUFS;
3154 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3155 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3156 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3157 goto out_register_late_subsys;
3158
3159 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3160 if (ret)
3161 goto out_register_late_subsys;
3162
3163out:
3164 return ret;
3165
3166out_register_late_subsys:
3167 unregister_pernet_subsys(&ip6_route_net_late_ops);
3168fib6_rules_init:
3169 fib6_rules_cleanup();
3170xfrm6_init:
3171 xfrm6_fini();
3172out_fib6_init:
3173 fib6_gc_cleanup();
3174out_register_subsys:
3175 unregister_pernet_subsys(&ip6_route_net_ops);
3176out_register_inetpeer:
3177 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3178out_dst_entries:
3179 dst_entries_destroy(&ip6_dst_blackhole_ops);
3180out_kmem_cache:
3181 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3182 goto out;
3183}
3184
3185void ip6_route_cleanup(void)
3186{
3187 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3188 unregister_pernet_subsys(&ip6_route_net_late_ops);
3189 fib6_rules_cleanup();
3190 xfrm6_fini();
3191 fib6_gc_cleanup();
3192 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3193 unregister_pernet_subsys(&ip6_route_net_ops);
3194 dst_entries_destroy(&ip6_dst_blackhole_ops);
3195 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3196}
kernel source for telekom puls (alcatel/mediatek)