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ipv6: change ipv6_stub_impl.ipv6_dst_lookup to take net argument
[deliverable/linux.git] / net / ipv6 / route.c
1 /*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 /* Changes:
15 *
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
23 * Ville Nuorvala
24 * Fixed routing subtrees.
25 */
26
27 #define pr_fmt(fmt) "IPv6: " fmt
28
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
48 #include <net/snmp.h>
49 #include <net/ipv6.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
54 #include <net/tcp.h>
55 #include <linux/rtnetlink.h>
56 #include <net/dst.h>
57 #include <net/xfrm.h>
58 #include <net/netevent.h>
59 #include <net/netlink.h>
60 #include <net/nexthop.h>
61 #include <net/lwtunnel.h>
62
63 #include <asm/uaccess.h>
64
65 #ifdef CONFIG_SYSCTL
66 #include <linux/sysctl.h>
67 #endif
68
69 enum rt6_nud_state {
70 RT6_NUD_FAIL_HARD = -3,
71 RT6_NUD_FAIL_PROBE = -2,
72 RT6_NUD_FAIL_DO_RR = -1,
73 RT6_NUD_SUCCEED = 1
74 };
75
76 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
77 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
78 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
79 static unsigned int ip6_mtu(const struct dst_entry *dst);
80 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
81 static void ip6_dst_destroy(struct dst_entry *);
82 static void ip6_dst_ifdown(struct dst_entry *,
83 struct net_device *dev, int how);
84 static int ip6_dst_gc(struct dst_ops *ops);
85
86 static int ip6_pkt_discard(struct sk_buff *skb);
87 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
88 static int ip6_pkt_prohibit(struct sk_buff *skb);
89 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb);
90 static void ip6_link_failure(struct sk_buff *skb);
91 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
92 struct sk_buff *skb, u32 mtu);
93 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
94 struct sk_buff *skb);
95 static void rt6_dst_from_metrics_check(struct rt6_info *rt);
96 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
97
98 #ifdef CONFIG_IPV6_ROUTE_INFO
99 static struct rt6_info *rt6_add_route_info(struct net *net,
100 const struct in6_addr *prefix, int prefixlen,
101 const struct in6_addr *gwaddr, int ifindex,
102 unsigned int pref);
103 static struct rt6_info *rt6_get_route_info(struct net *net,
104 const struct in6_addr *prefix, int prefixlen,
105 const struct in6_addr *gwaddr, int ifindex);
106 #endif
107
108 struct uncached_list {
109 spinlock_t lock;
110 struct list_head head;
111 };
112
113 static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
114
115 static void rt6_uncached_list_add(struct rt6_info *rt)
116 {
117 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
118
119 rt->dst.flags |= DST_NOCACHE;
120 rt->rt6i_uncached_list = ul;
121
122 spin_lock_bh(&ul->lock);
123 list_add_tail(&rt->rt6i_uncached, &ul->head);
124 spin_unlock_bh(&ul->lock);
125 }
126
127 static void rt6_uncached_list_del(struct rt6_info *rt)
128 {
129 if (!list_empty(&rt->rt6i_uncached)) {
130 struct uncached_list *ul = rt->rt6i_uncached_list;
131
132 spin_lock_bh(&ul->lock);
133 list_del(&rt->rt6i_uncached);
134 spin_unlock_bh(&ul->lock);
135 }
136 }
137
138 static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
139 {
140 struct net_device *loopback_dev = net->loopback_dev;
141 int cpu;
142
143 for_each_possible_cpu(cpu) {
144 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
145 struct rt6_info *rt;
146
147 spin_lock_bh(&ul->lock);
148 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
149 struct inet6_dev *rt_idev = rt->rt6i_idev;
150 struct net_device *rt_dev = rt->dst.dev;
151
152 if (rt_idev && (rt_idev->dev == dev || !dev) &&
153 rt_idev->dev != loopback_dev) {
154 rt->rt6i_idev = in6_dev_get(loopback_dev);
155 in6_dev_put(rt_idev);
156 }
157
158 if (rt_dev && (rt_dev == dev || !dev) &&
159 rt_dev != loopback_dev) {
160 rt->dst.dev = loopback_dev;
161 dev_hold(rt->dst.dev);
162 dev_put(rt_dev);
163 }
164 }
165 spin_unlock_bh(&ul->lock);
166 }
167 }
168
169 static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
170 {
171 return dst_metrics_write_ptr(rt->dst.from);
172 }
173
174 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
175 {
176 struct rt6_info *rt = (struct rt6_info *)dst;
177
178 if (rt->rt6i_flags & RTF_PCPU)
179 return rt6_pcpu_cow_metrics(rt);
180 else if (rt->rt6i_flags & RTF_CACHE)
181 return NULL;
182 else
183 return dst_cow_metrics_generic(dst, old);
184 }
185
186 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
187 struct sk_buff *skb,
188 const void *daddr)
189 {
190 struct in6_addr *p = &rt->rt6i_gateway;
191
192 if (!ipv6_addr_any(p))
193 return (const void *) p;
194 else if (skb)
195 return &ipv6_hdr(skb)->daddr;
196 return daddr;
197 }
198
199 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
200 struct sk_buff *skb,
201 const void *daddr)
202 {
203 struct rt6_info *rt = (struct rt6_info *) dst;
204 struct neighbour *n;
205
206 daddr = choose_neigh_daddr(rt, skb, daddr);
207 n = __ipv6_neigh_lookup(dst->dev, daddr);
208 if (n)
209 return n;
210 return neigh_create(&nd_tbl, daddr, dst->dev);
211 }
212
213 static struct dst_ops ip6_dst_ops_template = {
214 .family = AF_INET6,
215 .gc = ip6_dst_gc,
216 .gc_thresh = 1024,
217 .check = ip6_dst_check,
218 .default_advmss = ip6_default_advmss,
219 .mtu = ip6_mtu,
220 .cow_metrics = ipv6_cow_metrics,
221 .destroy = ip6_dst_destroy,
222 .ifdown = ip6_dst_ifdown,
223 .negative_advice = ip6_negative_advice,
224 .link_failure = ip6_link_failure,
225 .update_pmtu = ip6_rt_update_pmtu,
226 .redirect = rt6_do_redirect,
227 .local_out = __ip6_local_out,
228 .neigh_lookup = ip6_neigh_lookup,
229 };
230
231 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
232 {
233 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
234
235 return mtu ? : dst->dev->mtu;
236 }
237
238 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
239 struct sk_buff *skb, u32 mtu)
240 {
241 }
242
243 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
244 struct sk_buff *skb)
245 {
246 }
247
248 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
249 unsigned long old)
250 {
251 return NULL;
252 }
253
254 static struct dst_ops ip6_dst_blackhole_ops = {
255 .family = AF_INET6,
256 .destroy = ip6_dst_destroy,
257 .check = ip6_dst_check,
258 .mtu = ip6_blackhole_mtu,
259 .default_advmss = ip6_default_advmss,
260 .update_pmtu = ip6_rt_blackhole_update_pmtu,
261 .redirect = ip6_rt_blackhole_redirect,
262 .cow_metrics = ip6_rt_blackhole_cow_metrics,
263 .neigh_lookup = ip6_neigh_lookup,
264 };
265
266 static const u32 ip6_template_metrics[RTAX_MAX] = {
267 [RTAX_HOPLIMIT - 1] = 0,
268 };
269
270 static const struct rt6_info ip6_null_entry_template = {
271 .dst = {
272 .__refcnt = ATOMIC_INIT(1),
273 .__use = 1,
274 .obsolete = DST_OBSOLETE_FORCE_CHK,
275 .error = -ENETUNREACH,
276 .input = ip6_pkt_discard,
277 .output = ip6_pkt_discard_out,
278 },
279 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
280 .rt6i_protocol = RTPROT_KERNEL,
281 .rt6i_metric = ~(u32) 0,
282 .rt6i_ref = ATOMIC_INIT(1),
283 };
284
285 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
286
287 static const struct rt6_info ip6_prohibit_entry_template = {
288 .dst = {
289 .__refcnt = ATOMIC_INIT(1),
290 .__use = 1,
291 .obsolete = DST_OBSOLETE_FORCE_CHK,
292 .error = -EACCES,
293 .input = ip6_pkt_prohibit,
294 .output = ip6_pkt_prohibit_out,
295 },
296 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
297 .rt6i_protocol = RTPROT_KERNEL,
298 .rt6i_metric = ~(u32) 0,
299 .rt6i_ref = ATOMIC_INIT(1),
300 };
301
302 static const struct rt6_info ip6_blk_hole_entry_template = {
303 .dst = {
304 .__refcnt = ATOMIC_INIT(1),
305 .__use = 1,
306 .obsolete = DST_OBSOLETE_FORCE_CHK,
307 .error = -EINVAL,
308 .input = dst_discard,
309 .output = dst_discard_sk,
310 },
311 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
312 .rt6i_protocol = RTPROT_KERNEL,
313 .rt6i_metric = ~(u32) 0,
314 .rt6i_ref = ATOMIC_INIT(1),
315 };
316
317 #endif
318
319 /* allocate dst with ip6_dst_ops */
320 static struct rt6_info *__ip6_dst_alloc(struct net *net,
321 struct net_device *dev,
322 int flags,
323 struct fib6_table *table)
324 {
325 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
326 0, DST_OBSOLETE_FORCE_CHK, flags);
327
328 if (rt) {
329 struct dst_entry *dst = &rt->dst;
330
331 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
332 INIT_LIST_HEAD(&rt->rt6i_siblings);
333 INIT_LIST_HEAD(&rt->rt6i_uncached);
334 }
335 return rt;
336 }
337
338 static struct rt6_info *ip6_dst_alloc(struct net *net,
339 struct net_device *dev,
340 int flags,
341 struct fib6_table *table)
342 {
343 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags, table);
344
345 if (rt) {
346 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
347 if (rt->rt6i_pcpu) {
348 int cpu;
349
350 for_each_possible_cpu(cpu) {
351 struct rt6_info **p;
352
353 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
354 /* no one shares rt */
355 *p = NULL;
356 }
357 } else {
358 dst_destroy((struct dst_entry *)rt);
359 return NULL;
360 }
361 }
362
363 return rt;
364 }
365
366 static void ip6_dst_destroy(struct dst_entry *dst)
367 {
368 struct rt6_info *rt = (struct rt6_info *)dst;
369 struct dst_entry *from = dst->from;
370 struct inet6_dev *idev;
371
372 dst_destroy_metrics_generic(dst);
373 free_percpu(rt->rt6i_pcpu);
374 rt6_uncached_list_del(rt);
375
376 idev = rt->rt6i_idev;
377 if (idev) {
378 rt->rt6i_idev = NULL;
379 in6_dev_put(idev);
380 }
381
382 dst->from = NULL;
383 dst_release(from);
384 }
385
386 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
387 int how)
388 {
389 struct rt6_info *rt = (struct rt6_info *)dst;
390 struct inet6_dev *idev = rt->rt6i_idev;
391 struct net_device *loopback_dev =
392 dev_net(dev)->loopback_dev;
393
394 if (dev != loopback_dev) {
395 if (idev && idev->dev == dev) {
396 struct inet6_dev *loopback_idev =
397 in6_dev_get(loopback_dev);
398 if (loopback_idev) {
399 rt->rt6i_idev = loopback_idev;
400 in6_dev_put(idev);
401 }
402 }
403 }
404 }
405
406 static bool rt6_check_expired(const struct rt6_info *rt)
407 {
408 if (rt->rt6i_flags & RTF_EXPIRES) {
409 if (time_after(jiffies, rt->dst.expires))
410 return true;
411 } else if (rt->dst.from) {
412 return rt6_check_expired((struct rt6_info *) rt->dst.from);
413 }
414 return false;
415 }
416
417 /* Multipath route selection:
418 * Hash based function using packet header and flowlabel.
419 * Adapted from fib_info_hashfn()
420 */
421 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
422 const struct flowi6 *fl6)
423 {
424 unsigned int val = fl6->flowi6_proto;
425
426 val ^= ipv6_addr_hash(&fl6->daddr);
427 val ^= ipv6_addr_hash(&fl6->saddr);
428
429 /* Work only if this not encapsulated */
430 switch (fl6->flowi6_proto) {
431 case IPPROTO_UDP:
432 case IPPROTO_TCP:
433 case IPPROTO_SCTP:
434 val ^= (__force u16)fl6->fl6_sport;
435 val ^= (__force u16)fl6->fl6_dport;
436 break;
437
438 case IPPROTO_ICMPV6:
439 val ^= (__force u16)fl6->fl6_icmp_type;
440 val ^= (__force u16)fl6->fl6_icmp_code;
441 break;
442 }
443 /* RFC6438 recommands to use flowlabel */
444 val ^= (__force u32)fl6->flowlabel;
445
446 /* Perhaps, we need to tune, this function? */
447 val = val ^ (val >> 7) ^ (val >> 12);
448 return val % candidate_count;
449 }
450
451 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
452 struct flowi6 *fl6, int oif,
453 int strict)
454 {
455 struct rt6_info *sibling, *next_sibling;
456 int route_choosen;
457
458 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
459 /* Don't change the route, if route_choosen == 0
460 * (siblings does not include ourself)
461 */
462 if (route_choosen)
463 list_for_each_entry_safe(sibling, next_sibling,
464 &match->rt6i_siblings, rt6i_siblings) {
465 route_choosen--;
466 if (route_choosen == 0) {
467 if (rt6_score_route(sibling, oif, strict) < 0)
468 break;
469 match = sibling;
470 break;
471 }
472 }
473 return match;
474 }
475
476 /*
477 * Route lookup. Any table->tb6_lock is implied.
478 */
479
480 static inline struct rt6_info *rt6_device_match(struct net *net,
481 struct rt6_info *rt,
482 const struct in6_addr *saddr,
483 int oif,
484 int flags)
485 {
486 struct rt6_info *local = NULL;
487 struct rt6_info *sprt;
488
489 if (!oif && ipv6_addr_any(saddr))
490 goto out;
491
492 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
493 struct net_device *dev = sprt->dst.dev;
494
495 if (oif) {
496 if (dev->ifindex == oif)
497 return sprt;
498 if (dev->flags & IFF_LOOPBACK) {
499 if (!sprt->rt6i_idev ||
500 sprt->rt6i_idev->dev->ifindex != oif) {
501 if (flags & RT6_LOOKUP_F_IFACE && oif)
502 continue;
503 if (local && (!oif ||
504 local->rt6i_idev->dev->ifindex == oif))
505 continue;
506 }
507 local = sprt;
508 }
509 } else {
510 if (ipv6_chk_addr(net, saddr, dev,
511 flags & RT6_LOOKUP_F_IFACE))
512 return sprt;
513 }
514 }
515
516 if (oif) {
517 if (local)
518 return local;
519
520 if (flags & RT6_LOOKUP_F_IFACE)
521 return net->ipv6.ip6_null_entry;
522 }
523 out:
524 return rt;
525 }
526
527 #ifdef CONFIG_IPV6_ROUTER_PREF
528 struct __rt6_probe_work {
529 struct work_struct work;
530 struct in6_addr target;
531 struct net_device *dev;
532 };
533
534 static void rt6_probe_deferred(struct work_struct *w)
535 {
536 struct in6_addr mcaddr;
537 struct __rt6_probe_work *work =
538 container_of(w, struct __rt6_probe_work, work);
539
540 addrconf_addr_solict_mult(&work->target, &mcaddr);
541 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
542 dev_put(work->dev);
543 kfree(work);
544 }
545
546 static void rt6_probe(struct rt6_info *rt)
547 {
548 struct __rt6_probe_work *work;
549 struct neighbour *neigh;
550 /*
551 * Okay, this does not seem to be appropriate
552 * for now, however, we need to check if it
553 * is really so; aka Router Reachability Probing.
554 *
555 * Router Reachability Probe MUST be rate-limited
556 * to no more than one per minute.
557 */
558 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
559 return;
560 rcu_read_lock_bh();
561 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
562 if (neigh) {
563 if (neigh->nud_state & NUD_VALID)
564 goto out;
565
566 work = NULL;
567 write_lock(&neigh->lock);
568 if (!(neigh->nud_state & NUD_VALID) &&
569 time_after(jiffies,
570 neigh->updated +
571 rt->rt6i_idev->cnf.rtr_probe_interval)) {
572 work = kmalloc(sizeof(*work), GFP_ATOMIC);
573 if (work)
574 __neigh_set_probe_once(neigh);
575 }
576 write_unlock(&neigh->lock);
577 } else {
578 work = kmalloc(sizeof(*work), GFP_ATOMIC);
579 }
580
581 if (work) {
582 INIT_WORK(&work->work, rt6_probe_deferred);
583 work->target = rt->rt6i_gateway;
584 dev_hold(rt->dst.dev);
585 work->dev = rt->dst.dev;
586 schedule_work(&work->work);
587 }
588
589 out:
590 rcu_read_unlock_bh();
591 }
592 #else
593 static inline void rt6_probe(struct rt6_info *rt)
594 {
595 }
596 #endif
597
598 /*
599 * Default Router Selection (RFC 2461 6.3.6)
600 */
601 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
602 {
603 struct net_device *dev = rt->dst.dev;
604 if (!oif || dev->ifindex == oif)
605 return 2;
606 if ((dev->flags & IFF_LOOPBACK) &&
607 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
608 return 1;
609 return 0;
610 }
611
612 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
613 {
614 struct neighbour *neigh;
615 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
616
617 if (rt->rt6i_flags & RTF_NONEXTHOP ||
618 !(rt->rt6i_flags & RTF_GATEWAY))
619 return RT6_NUD_SUCCEED;
620
621 rcu_read_lock_bh();
622 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
623 if (neigh) {
624 read_lock(&neigh->lock);
625 if (neigh->nud_state & NUD_VALID)
626 ret = RT6_NUD_SUCCEED;
627 #ifdef CONFIG_IPV6_ROUTER_PREF
628 else if (!(neigh->nud_state & NUD_FAILED))
629 ret = RT6_NUD_SUCCEED;
630 else
631 ret = RT6_NUD_FAIL_PROBE;
632 #endif
633 read_unlock(&neigh->lock);
634 } else {
635 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
636 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
637 }
638 rcu_read_unlock_bh();
639
640 return ret;
641 }
642
643 static int rt6_score_route(struct rt6_info *rt, int oif,
644 int strict)
645 {
646 int m;
647
648 m = rt6_check_dev(rt, oif);
649 if (!m && (strict & RT6_LOOKUP_F_IFACE))
650 return RT6_NUD_FAIL_HARD;
651 #ifdef CONFIG_IPV6_ROUTER_PREF
652 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
653 #endif
654 if (strict & RT6_LOOKUP_F_REACHABLE) {
655 int n = rt6_check_neigh(rt);
656 if (n < 0)
657 return n;
658 }
659 return m;
660 }
661
662 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
663 int *mpri, struct rt6_info *match,
664 bool *do_rr)
665 {
666 int m;
667 bool match_do_rr = false;
668
669 if (rt6_check_expired(rt))
670 goto out;
671
672 m = rt6_score_route(rt, oif, strict);
673 if (m == RT6_NUD_FAIL_DO_RR) {
674 match_do_rr = true;
675 m = 0; /* lowest valid score */
676 } else if (m == RT6_NUD_FAIL_HARD) {
677 goto out;
678 }
679
680 if (strict & RT6_LOOKUP_F_REACHABLE)
681 rt6_probe(rt);
682
683 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
684 if (m > *mpri) {
685 *do_rr = match_do_rr;
686 *mpri = m;
687 match = rt;
688 }
689 out:
690 return match;
691 }
692
693 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
694 struct rt6_info *rr_head,
695 u32 metric, int oif, int strict,
696 bool *do_rr)
697 {
698 struct rt6_info *rt, *match, *cont;
699 int mpri = -1;
700
701 match = NULL;
702 cont = NULL;
703 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
704 if (rt->rt6i_metric != metric) {
705 cont = rt;
706 break;
707 }
708
709 match = find_match(rt, oif, strict, &mpri, match, do_rr);
710 }
711
712 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
713 if (rt->rt6i_metric != metric) {
714 cont = rt;
715 break;
716 }
717
718 match = find_match(rt, oif, strict, &mpri, match, do_rr);
719 }
720
721 if (match || !cont)
722 return match;
723
724 for (rt = cont; rt; rt = rt->dst.rt6_next)
725 match = find_match(rt, oif, strict, &mpri, match, do_rr);
726
727 return match;
728 }
729
730 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
731 {
732 struct rt6_info *match, *rt0;
733 struct net *net;
734 bool do_rr = false;
735
736 rt0 = fn->rr_ptr;
737 if (!rt0)
738 fn->rr_ptr = rt0 = fn->leaf;
739
740 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
741 &do_rr);
742
743 if (do_rr) {
744 struct rt6_info *next = rt0->dst.rt6_next;
745
746 /* no entries matched; do round-robin */
747 if (!next || next->rt6i_metric != rt0->rt6i_metric)
748 next = fn->leaf;
749
750 if (next != rt0)
751 fn->rr_ptr = next;
752 }
753
754 net = dev_net(rt0->dst.dev);
755 return match ? match : net->ipv6.ip6_null_entry;
756 }
757
758 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
759 {
760 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
761 }
762
763 #ifdef CONFIG_IPV6_ROUTE_INFO
764 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
765 const struct in6_addr *gwaddr)
766 {
767 struct net *net = dev_net(dev);
768 struct route_info *rinfo = (struct route_info *) opt;
769 struct in6_addr prefix_buf, *prefix;
770 unsigned int pref;
771 unsigned long lifetime;
772 struct rt6_info *rt;
773
774 if (len < sizeof(struct route_info)) {
775 return -EINVAL;
776 }
777
778 /* Sanity check for prefix_len and length */
779 if (rinfo->length > 3) {
780 return -EINVAL;
781 } else if (rinfo->prefix_len > 128) {
782 return -EINVAL;
783 } else if (rinfo->prefix_len > 64) {
784 if (rinfo->length < 2) {
785 return -EINVAL;
786 }
787 } else if (rinfo->prefix_len > 0) {
788 if (rinfo->length < 1) {
789 return -EINVAL;
790 }
791 }
792
793 pref = rinfo->route_pref;
794 if (pref == ICMPV6_ROUTER_PREF_INVALID)
795 return -EINVAL;
796
797 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
798
799 if (rinfo->length == 3)
800 prefix = (struct in6_addr *)rinfo->prefix;
801 else {
802 /* this function is safe */
803 ipv6_addr_prefix(&prefix_buf,
804 (struct in6_addr *)rinfo->prefix,
805 rinfo->prefix_len);
806 prefix = &prefix_buf;
807 }
808
809 if (rinfo->prefix_len == 0)
810 rt = rt6_get_dflt_router(gwaddr, dev);
811 else
812 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
813 gwaddr, dev->ifindex);
814
815 if (rt && !lifetime) {
816 ip6_del_rt(rt);
817 rt = NULL;
818 }
819
820 if (!rt && lifetime)
821 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
822 pref);
823 else if (rt)
824 rt->rt6i_flags = RTF_ROUTEINFO |
825 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
826
827 if (rt) {
828 if (!addrconf_finite_timeout(lifetime))
829 rt6_clean_expires(rt);
830 else
831 rt6_set_expires(rt, jiffies + HZ * lifetime);
832
833 ip6_rt_put(rt);
834 }
835 return 0;
836 }
837 #endif
838
839 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
840 struct in6_addr *saddr)
841 {
842 struct fib6_node *pn;
843 while (1) {
844 if (fn->fn_flags & RTN_TL_ROOT)
845 return NULL;
846 pn = fn->parent;
847 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
848 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
849 else
850 fn = pn;
851 if (fn->fn_flags & RTN_RTINFO)
852 return fn;
853 }
854 }
855
856 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
857 struct fib6_table *table,
858 struct flowi6 *fl6, int flags)
859 {
860 struct fib6_node *fn;
861 struct rt6_info *rt;
862
863 read_lock_bh(&table->tb6_lock);
864 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
865 restart:
866 rt = fn->leaf;
867 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
868 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
869 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
870 if (rt == net->ipv6.ip6_null_entry) {
871 fn = fib6_backtrack(fn, &fl6->saddr);
872 if (fn)
873 goto restart;
874 }
875 dst_use(&rt->dst, jiffies);
876 read_unlock_bh(&table->tb6_lock);
877 return rt;
878
879 }
880
881 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
882 int flags)
883 {
884 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
885 }
886 EXPORT_SYMBOL_GPL(ip6_route_lookup);
887
888 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
889 const struct in6_addr *saddr, int oif, int strict)
890 {
891 struct flowi6 fl6 = {
892 .flowi6_oif = oif,
893 .daddr = *daddr,
894 };
895 struct dst_entry *dst;
896 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
897
898 if (saddr) {
899 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
900 flags |= RT6_LOOKUP_F_HAS_SADDR;
901 }
902
903 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
904 if (dst->error == 0)
905 return (struct rt6_info *) dst;
906
907 dst_release(dst);
908
909 return NULL;
910 }
911 EXPORT_SYMBOL(rt6_lookup);
912
913 /* ip6_ins_rt is called with FREE table->tb6_lock.
914 It takes new route entry, the addition fails by any reason the
915 route is freed. In any case, if caller does not hold it, it may
916 be destroyed.
917 */
918
919 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
920 struct mx6_config *mxc)
921 {
922 int err;
923 struct fib6_table *table;
924
925 table = rt->rt6i_table;
926 write_lock_bh(&table->tb6_lock);
927 err = fib6_add(&table->tb6_root, rt, info, mxc);
928 write_unlock_bh(&table->tb6_lock);
929
930 return err;
931 }
932
933 int ip6_ins_rt(struct rt6_info *rt)
934 {
935 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
936 struct mx6_config mxc = { .mx = NULL, };
937
938 return __ip6_ins_rt(rt, &info, &mxc);
939 }
940
941 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
942 const struct in6_addr *daddr,
943 const struct in6_addr *saddr)
944 {
945 struct rt6_info *rt;
946
947 /*
948 * Clone the route.
949 */
950
951 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
952 ort = (struct rt6_info *)ort->dst.from;
953
954 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev,
955 0, ort->rt6i_table);
956
957 if (!rt)
958 return NULL;
959
960 ip6_rt_copy_init(rt, ort);
961 rt->rt6i_flags |= RTF_CACHE;
962 rt->rt6i_metric = 0;
963 rt->dst.flags |= DST_HOST;
964 rt->rt6i_dst.addr = *daddr;
965 rt->rt6i_dst.plen = 128;
966
967 if (!rt6_is_gw_or_nonexthop(ort)) {
968 if (ort->rt6i_dst.plen != 128 &&
969 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
970 rt->rt6i_flags |= RTF_ANYCAST;
971 #ifdef CONFIG_IPV6_SUBTREES
972 if (rt->rt6i_src.plen && saddr) {
973 rt->rt6i_src.addr = *saddr;
974 rt->rt6i_src.plen = 128;
975 }
976 #endif
977 }
978
979 return rt;
980 }
981
982 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
983 {
984 struct rt6_info *pcpu_rt;
985
986 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
987 rt->dst.dev, rt->dst.flags,
988 rt->rt6i_table);
989
990 if (!pcpu_rt)
991 return NULL;
992 ip6_rt_copy_init(pcpu_rt, rt);
993 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
994 pcpu_rt->rt6i_flags |= RTF_PCPU;
995 return pcpu_rt;
996 }
997
998 /* It should be called with read_lock_bh(&tb6_lock) acquired */
999 static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
1000 {
1001 struct rt6_info *pcpu_rt, *prev, **p;
1002
1003 p = this_cpu_ptr(rt->rt6i_pcpu);
1004 pcpu_rt = *p;
1005
1006 if (pcpu_rt)
1007 goto done;
1008
1009 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1010 if (!pcpu_rt) {
1011 struct net *net = dev_net(rt->dst.dev);
1012
1013 pcpu_rt = net->ipv6.ip6_null_entry;
1014 goto done;
1015 }
1016
1017 prev = cmpxchg(p, NULL, pcpu_rt);
1018 if (prev) {
1019 /* If someone did it before us, return prev instead */
1020 dst_destroy(&pcpu_rt->dst);
1021 pcpu_rt = prev;
1022 }
1023
1024 done:
1025 dst_hold(&pcpu_rt->dst);
1026 rt6_dst_from_metrics_check(pcpu_rt);
1027 return pcpu_rt;
1028 }
1029
1030 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
1031 struct flowi6 *fl6, int flags)
1032 {
1033 struct fib6_node *fn, *saved_fn;
1034 struct rt6_info *rt;
1035 int strict = 0;
1036
1037 strict |= flags & RT6_LOOKUP_F_IFACE;
1038 if (net->ipv6.devconf_all->forwarding == 0)
1039 strict |= RT6_LOOKUP_F_REACHABLE;
1040
1041 read_lock_bh(&table->tb6_lock);
1042
1043 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1044 saved_fn = fn;
1045
1046 redo_rt6_select:
1047 rt = rt6_select(fn, oif, strict);
1048 if (rt->rt6i_nsiblings)
1049 rt = rt6_multipath_select(rt, fl6, oif, strict);
1050 if (rt == net->ipv6.ip6_null_entry) {
1051 fn = fib6_backtrack(fn, &fl6->saddr);
1052 if (fn)
1053 goto redo_rt6_select;
1054 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1055 /* also consider unreachable route */
1056 strict &= ~RT6_LOOKUP_F_REACHABLE;
1057 fn = saved_fn;
1058 goto redo_rt6_select;
1059 }
1060 }
1061
1062
1063 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1064 dst_use(&rt->dst, jiffies);
1065 read_unlock_bh(&table->tb6_lock);
1066
1067 rt6_dst_from_metrics_check(rt);
1068 return rt;
1069 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1070 !(rt->rt6i_flags & RTF_GATEWAY))) {
1071 /* Create a RTF_CACHE clone which will not be
1072 * owned by the fib6 tree. It is for the special case where
1073 * the daddr in the skb during the neighbor look-up is different
1074 * from the fl6->daddr used to look-up route here.
1075 */
1076
1077 struct rt6_info *uncached_rt;
1078
1079 dst_use(&rt->dst, jiffies);
1080 read_unlock_bh(&table->tb6_lock);
1081
1082 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1083 dst_release(&rt->dst);
1084
1085 if (uncached_rt)
1086 rt6_uncached_list_add(uncached_rt);
1087 else
1088 uncached_rt = net->ipv6.ip6_null_entry;
1089
1090 dst_hold(&uncached_rt->dst);
1091 return uncached_rt;
1092
1093 } else {
1094 /* Get a percpu copy */
1095
1096 struct rt6_info *pcpu_rt;
1097
1098 rt->dst.lastuse = jiffies;
1099 rt->dst.__use++;
1100 pcpu_rt = rt6_get_pcpu_route(rt);
1101 read_unlock_bh(&table->tb6_lock);
1102
1103 return pcpu_rt;
1104 }
1105 }
1106
1107 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1108 struct flowi6 *fl6, int flags)
1109 {
1110 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1111 }
1112
1113 static struct dst_entry *ip6_route_input_lookup(struct net *net,
1114 struct net_device *dev,
1115 struct flowi6 *fl6, int flags)
1116 {
1117 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1118 flags |= RT6_LOOKUP_F_IFACE;
1119
1120 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1121 }
1122
1123 void ip6_route_input(struct sk_buff *skb)
1124 {
1125 const struct ipv6hdr *iph = ipv6_hdr(skb);
1126 struct net *net = dev_net(skb->dev);
1127 int flags = RT6_LOOKUP_F_HAS_SADDR;
1128 struct flowi6 fl6 = {
1129 .flowi6_iif = skb->dev->ifindex,
1130 .daddr = iph->daddr,
1131 .saddr = iph->saddr,
1132 .flowlabel = ip6_flowinfo(iph),
1133 .flowi6_mark = skb->mark,
1134 .flowi6_proto = iph->nexthdr,
1135 };
1136
1137 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1138 }
1139
1140 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1141 struct flowi6 *fl6, int flags)
1142 {
1143 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1144 }
1145
1146 struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
1147 struct flowi6 *fl6)
1148 {
1149 int flags = 0;
1150
1151 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1152
1153 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1154 flags |= RT6_LOOKUP_F_IFACE;
1155
1156 if (!ipv6_addr_any(&fl6->saddr))
1157 flags |= RT6_LOOKUP_F_HAS_SADDR;
1158 else if (sk)
1159 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1160
1161 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1162 }
1163 EXPORT_SYMBOL(ip6_route_output);
1164
1165 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1166 {
1167 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1168 struct dst_entry *new = NULL;
1169
1170 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1171 if (rt) {
1172 new = &rt->dst;
1173
1174 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1175
1176 new->__use = 1;
1177 new->input = dst_discard;
1178 new->output = dst_discard_sk;
1179
1180 if (dst_metrics_read_only(&ort->dst))
1181 new->_metrics = ort->dst._metrics;
1182 else
1183 dst_copy_metrics(new, &ort->dst);
1184 rt->rt6i_idev = ort->rt6i_idev;
1185 if (rt->rt6i_idev)
1186 in6_dev_hold(rt->rt6i_idev);
1187
1188 rt->rt6i_gateway = ort->rt6i_gateway;
1189 rt->rt6i_flags = ort->rt6i_flags;
1190 rt->rt6i_metric = 0;
1191
1192 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1193 #ifdef CONFIG_IPV6_SUBTREES
1194 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1195 #endif
1196
1197 dst_free(new);
1198 }
1199
1200 dst_release(dst_orig);
1201 return new ? new : ERR_PTR(-ENOMEM);
1202 }
1203
1204 /*
1205 * Destination cache support functions
1206 */
1207
1208 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1209 {
1210 if (rt->dst.from &&
1211 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1212 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1213 }
1214
1215 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1216 {
1217 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1218 return NULL;
1219
1220 if (rt6_check_expired(rt))
1221 return NULL;
1222
1223 return &rt->dst;
1224 }
1225
1226 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1227 {
1228 if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1229 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1230 return &rt->dst;
1231 else
1232 return NULL;
1233 }
1234
1235 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1236 {
1237 struct rt6_info *rt;
1238
1239 rt = (struct rt6_info *) dst;
1240
1241 /* All IPV6 dsts are created with ->obsolete set to the value
1242 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1243 * into this function always.
1244 */
1245
1246 rt6_dst_from_metrics_check(rt);
1247
1248 if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE))
1249 return rt6_dst_from_check(rt, cookie);
1250 else
1251 return rt6_check(rt, cookie);
1252 }
1253
1254 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1255 {
1256 struct rt6_info *rt = (struct rt6_info *) dst;
1257
1258 if (rt) {
1259 if (rt->rt6i_flags & RTF_CACHE) {
1260 if (rt6_check_expired(rt)) {
1261 ip6_del_rt(rt);
1262 dst = NULL;
1263 }
1264 } else {
1265 dst_release(dst);
1266 dst = NULL;
1267 }
1268 }
1269 return dst;
1270 }
1271
1272 static void ip6_link_failure(struct sk_buff *skb)
1273 {
1274 struct rt6_info *rt;
1275
1276 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1277
1278 rt = (struct rt6_info *) skb_dst(skb);
1279 if (rt) {
1280 if (rt->rt6i_flags & RTF_CACHE) {
1281 dst_hold(&rt->dst);
1282 if (ip6_del_rt(rt))
1283 dst_free(&rt->dst);
1284 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1285 rt->rt6i_node->fn_sernum = -1;
1286 }
1287 }
1288 }
1289
1290 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1291 {
1292 struct net *net = dev_net(rt->dst.dev);
1293
1294 rt->rt6i_flags |= RTF_MODIFIED;
1295 rt->rt6i_pmtu = mtu;
1296 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1297 }
1298
1299 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1300 const struct ipv6hdr *iph, u32 mtu)
1301 {
1302 struct rt6_info *rt6 = (struct rt6_info *)dst;
1303
1304 if (rt6->rt6i_flags & RTF_LOCAL)
1305 return;
1306
1307 dst_confirm(dst);
1308 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1309 if (mtu >= dst_mtu(dst))
1310 return;
1311
1312 if (rt6->rt6i_flags & RTF_CACHE) {
1313 rt6_do_update_pmtu(rt6, mtu);
1314 } else {
1315 const struct in6_addr *daddr, *saddr;
1316 struct rt6_info *nrt6;
1317
1318 if (iph) {
1319 daddr = &iph->daddr;
1320 saddr = &iph->saddr;
1321 } else if (sk) {
1322 daddr = &sk->sk_v6_daddr;
1323 saddr = &inet6_sk(sk)->saddr;
1324 } else {
1325 return;
1326 }
1327 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1328 if (nrt6) {
1329 rt6_do_update_pmtu(nrt6, mtu);
1330
1331 /* ip6_ins_rt(nrt6) will bump the
1332 * rt6->rt6i_node->fn_sernum
1333 * which will fail the next rt6_check() and
1334 * invalidate the sk->sk_dst_cache.
1335 */
1336 ip6_ins_rt(nrt6);
1337 }
1338 }
1339 }
1340
1341 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1342 struct sk_buff *skb, u32 mtu)
1343 {
1344 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1345 }
1346
1347 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1348 int oif, u32 mark)
1349 {
1350 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1351 struct dst_entry *dst;
1352 struct flowi6 fl6;
1353
1354 memset(&fl6, 0, sizeof(fl6));
1355 fl6.flowi6_oif = oif;
1356 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1357 fl6.daddr = iph->daddr;
1358 fl6.saddr = iph->saddr;
1359 fl6.flowlabel = ip6_flowinfo(iph);
1360
1361 dst = ip6_route_output(net, NULL, &fl6);
1362 if (!dst->error)
1363 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1364 dst_release(dst);
1365 }
1366 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1367
1368 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1369 {
1370 ip6_update_pmtu(skb, sock_net(sk), mtu,
1371 sk->sk_bound_dev_if, sk->sk_mark);
1372 }
1373 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1374
1375 /* Handle redirects */
1376 struct ip6rd_flowi {
1377 struct flowi6 fl6;
1378 struct in6_addr gateway;
1379 };
1380
1381 static struct rt6_info *__ip6_route_redirect(struct net *net,
1382 struct fib6_table *table,
1383 struct flowi6 *fl6,
1384 int flags)
1385 {
1386 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1387 struct rt6_info *rt;
1388 struct fib6_node *fn;
1389
1390 /* Get the "current" route for this destination and
1391 * check if the redirect has come from approriate router.
1392 *
1393 * RFC 4861 specifies that redirects should only be
1394 * accepted if they come from the nexthop to the target.
1395 * Due to the way the routes are chosen, this notion
1396 * is a bit fuzzy and one might need to check all possible
1397 * routes.
1398 */
1399
1400 read_lock_bh(&table->tb6_lock);
1401 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1402 restart:
1403 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1404 if (rt6_check_expired(rt))
1405 continue;
1406 if (rt->dst.error)
1407 break;
1408 if (!(rt->rt6i_flags & RTF_GATEWAY))
1409 continue;
1410 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1411 continue;
1412 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1413 continue;
1414 break;
1415 }
1416
1417 if (!rt)
1418 rt = net->ipv6.ip6_null_entry;
1419 else if (rt->dst.error) {
1420 rt = net->ipv6.ip6_null_entry;
1421 goto out;
1422 }
1423
1424 if (rt == net->ipv6.ip6_null_entry) {
1425 fn = fib6_backtrack(fn, &fl6->saddr);
1426 if (fn)
1427 goto restart;
1428 }
1429
1430 out:
1431 dst_hold(&rt->dst);
1432
1433 read_unlock_bh(&table->tb6_lock);
1434
1435 return rt;
1436 };
1437
1438 static struct dst_entry *ip6_route_redirect(struct net *net,
1439 const struct flowi6 *fl6,
1440 const struct in6_addr *gateway)
1441 {
1442 int flags = RT6_LOOKUP_F_HAS_SADDR;
1443 struct ip6rd_flowi rdfl;
1444
1445 rdfl.fl6 = *fl6;
1446 rdfl.gateway = *gateway;
1447
1448 return fib6_rule_lookup(net, &rdfl.fl6,
1449 flags, __ip6_route_redirect);
1450 }
1451
1452 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1453 {
1454 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1455 struct dst_entry *dst;
1456 struct flowi6 fl6;
1457
1458 memset(&fl6, 0, sizeof(fl6));
1459 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1460 fl6.flowi6_oif = oif;
1461 fl6.flowi6_mark = mark;
1462 fl6.daddr = iph->daddr;
1463 fl6.saddr = iph->saddr;
1464 fl6.flowlabel = ip6_flowinfo(iph);
1465
1466 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1467 rt6_do_redirect(dst, NULL, skb);
1468 dst_release(dst);
1469 }
1470 EXPORT_SYMBOL_GPL(ip6_redirect);
1471
1472 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1473 u32 mark)
1474 {
1475 const struct ipv6hdr *iph = ipv6_hdr(skb);
1476 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1477 struct dst_entry *dst;
1478 struct flowi6 fl6;
1479
1480 memset(&fl6, 0, sizeof(fl6));
1481 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1482 fl6.flowi6_oif = oif;
1483 fl6.flowi6_mark = mark;
1484 fl6.daddr = msg->dest;
1485 fl6.saddr = iph->daddr;
1486
1487 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1488 rt6_do_redirect(dst, NULL, skb);
1489 dst_release(dst);
1490 }
1491
1492 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1493 {
1494 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1495 }
1496 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1497
1498 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1499 {
1500 struct net_device *dev = dst->dev;
1501 unsigned int mtu = dst_mtu(dst);
1502 struct net *net = dev_net(dev);
1503
1504 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1505
1506 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1507 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1508
1509 /*
1510 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1511 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1512 * IPV6_MAXPLEN is also valid and means: "any MSS,
1513 * rely only on pmtu discovery"
1514 */
1515 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1516 mtu = IPV6_MAXPLEN;
1517 return mtu;
1518 }
1519
1520 static unsigned int ip6_mtu(const struct dst_entry *dst)
1521 {
1522 const struct rt6_info *rt = (const struct rt6_info *)dst;
1523 unsigned int mtu = rt->rt6i_pmtu;
1524 struct inet6_dev *idev;
1525
1526 if (mtu)
1527 goto out;
1528
1529 mtu = dst_metric_raw(dst, RTAX_MTU);
1530 if (mtu)
1531 goto out;
1532
1533 mtu = IPV6_MIN_MTU;
1534
1535 rcu_read_lock();
1536 idev = __in6_dev_get(dst->dev);
1537 if (idev)
1538 mtu = idev->cnf.mtu6;
1539 rcu_read_unlock();
1540
1541 out:
1542 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1543 }
1544
1545 static struct dst_entry *icmp6_dst_gc_list;
1546 static DEFINE_SPINLOCK(icmp6_dst_lock);
1547
1548 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1549 struct flowi6 *fl6)
1550 {
1551 struct dst_entry *dst;
1552 struct rt6_info *rt;
1553 struct inet6_dev *idev = in6_dev_get(dev);
1554 struct net *net = dev_net(dev);
1555
1556 if (unlikely(!idev))
1557 return ERR_PTR(-ENODEV);
1558
1559 rt = ip6_dst_alloc(net, dev, 0, NULL);
1560 if (unlikely(!rt)) {
1561 in6_dev_put(idev);
1562 dst = ERR_PTR(-ENOMEM);
1563 goto out;
1564 }
1565
1566 rt->dst.flags |= DST_HOST;
1567 rt->dst.output = ip6_output;
1568 atomic_set(&rt->dst.__refcnt, 1);
1569 rt->rt6i_gateway = fl6->daddr;
1570 rt->rt6i_dst.addr = fl6->daddr;
1571 rt->rt6i_dst.plen = 128;
1572 rt->rt6i_idev = idev;
1573 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1574
1575 spin_lock_bh(&icmp6_dst_lock);
1576 rt->dst.next = icmp6_dst_gc_list;
1577 icmp6_dst_gc_list = &rt->dst;
1578 spin_unlock_bh(&icmp6_dst_lock);
1579
1580 fib6_force_start_gc(net);
1581
1582 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1583
1584 out:
1585 return dst;
1586 }
1587
1588 int icmp6_dst_gc(void)
1589 {
1590 struct dst_entry *dst, **pprev;
1591 int more = 0;
1592
1593 spin_lock_bh(&icmp6_dst_lock);
1594 pprev = &icmp6_dst_gc_list;
1595
1596 while ((dst = *pprev) != NULL) {
1597 if (!atomic_read(&dst->__refcnt)) {
1598 *pprev = dst->next;
1599 dst_free(dst);
1600 } else {
1601 pprev = &dst->next;
1602 ++more;
1603 }
1604 }
1605
1606 spin_unlock_bh(&icmp6_dst_lock);
1607
1608 return more;
1609 }
1610
1611 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1612 void *arg)
1613 {
1614 struct dst_entry *dst, **pprev;
1615
1616 spin_lock_bh(&icmp6_dst_lock);
1617 pprev = &icmp6_dst_gc_list;
1618 while ((dst = *pprev) != NULL) {
1619 struct rt6_info *rt = (struct rt6_info *) dst;
1620 if (func(rt, arg)) {
1621 *pprev = dst->next;
1622 dst_free(dst);
1623 } else {
1624 pprev = &dst->next;
1625 }
1626 }
1627 spin_unlock_bh(&icmp6_dst_lock);
1628 }
1629
1630 static int ip6_dst_gc(struct dst_ops *ops)
1631 {
1632 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1633 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1634 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1635 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1636 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1637 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1638 int entries;
1639
1640 entries = dst_entries_get_fast(ops);
1641 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1642 entries <= rt_max_size)
1643 goto out;
1644
1645 net->ipv6.ip6_rt_gc_expire++;
1646 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1647 entries = dst_entries_get_slow(ops);
1648 if (entries < ops->gc_thresh)
1649 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1650 out:
1651 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1652 return entries > rt_max_size;
1653 }
1654
1655 static int ip6_convert_metrics(struct mx6_config *mxc,
1656 const struct fib6_config *cfg)
1657 {
1658 struct nlattr *nla;
1659 int remaining;
1660 u32 *mp;
1661
1662 if (!cfg->fc_mx)
1663 return 0;
1664
1665 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1666 if (unlikely(!mp))
1667 return -ENOMEM;
1668
1669 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1670 int type = nla_type(nla);
1671
1672 if (type) {
1673 u32 val;
1674
1675 if (unlikely(type > RTAX_MAX))
1676 goto err;
1677 if (type == RTAX_CC_ALGO) {
1678 char tmp[TCP_CA_NAME_MAX];
1679
1680 nla_strlcpy(tmp, nla, sizeof(tmp));
1681 val = tcp_ca_get_key_by_name(tmp);
1682 if (val == TCP_CA_UNSPEC)
1683 goto err;
1684 } else {
1685 val = nla_get_u32(nla);
1686 }
1687
1688 mp[type - 1] = val;
1689 __set_bit(type - 1, mxc->mx_valid);
1690 }
1691 }
1692
1693 mxc->mx = mp;
1694
1695 return 0;
1696 err:
1697 kfree(mp);
1698 return -EINVAL;
1699 }
1700
1701 int ip6_route_add(struct fib6_config *cfg)
1702 {
1703 int err;
1704 struct net *net = cfg->fc_nlinfo.nl_net;
1705 struct rt6_info *rt = NULL;
1706 struct net_device *dev = NULL;
1707 struct inet6_dev *idev = NULL;
1708 struct fib6_table *table;
1709 struct mx6_config mxc = { .mx = NULL, };
1710 int addr_type;
1711
1712 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1713 return -EINVAL;
1714 #ifndef CONFIG_IPV6_SUBTREES
1715 if (cfg->fc_src_len)
1716 return -EINVAL;
1717 #endif
1718 if (cfg->fc_ifindex) {
1719 err = -ENODEV;
1720 dev = dev_get_by_index(net, cfg->fc_ifindex);
1721 if (!dev)
1722 goto out;
1723 idev = in6_dev_get(dev);
1724 if (!idev)
1725 goto out;
1726 }
1727
1728 if (cfg->fc_metric == 0)
1729 cfg->fc_metric = IP6_RT_PRIO_USER;
1730
1731 err = -ENOBUFS;
1732 if (cfg->fc_nlinfo.nlh &&
1733 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1734 table = fib6_get_table(net, cfg->fc_table);
1735 if (!table) {
1736 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1737 table = fib6_new_table(net, cfg->fc_table);
1738 }
1739 } else {
1740 table = fib6_new_table(net, cfg->fc_table);
1741 }
1742
1743 if (!table)
1744 goto out;
1745
1746 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1747
1748 if (!rt) {
1749 err = -ENOMEM;
1750 goto out;
1751 }
1752
1753 if (cfg->fc_flags & RTF_EXPIRES)
1754 rt6_set_expires(rt, jiffies +
1755 clock_t_to_jiffies(cfg->fc_expires));
1756 else
1757 rt6_clean_expires(rt);
1758
1759 if (cfg->fc_protocol == RTPROT_UNSPEC)
1760 cfg->fc_protocol = RTPROT_BOOT;
1761 rt->rt6i_protocol = cfg->fc_protocol;
1762
1763 addr_type = ipv6_addr_type(&cfg->fc_dst);
1764
1765 if (addr_type & IPV6_ADDR_MULTICAST)
1766 rt->dst.input = ip6_mc_input;
1767 else if (cfg->fc_flags & RTF_LOCAL)
1768 rt->dst.input = ip6_input;
1769 else
1770 rt->dst.input = ip6_forward;
1771
1772 rt->dst.output = ip6_output;
1773
1774 if (cfg->fc_encap) {
1775 struct lwtunnel_state *lwtstate;
1776
1777 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1778 cfg->fc_encap, &lwtstate);
1779 if (err)
1780 goto out;
1781 rt->rt6i_lwtstate = lwtstate_get(lwtstate);
1782 if (lwtunnel_output_redirect(rt->rt6i_lwtstate))
1783 rt->dst.output = lwtunnel_output6;
1784 }
1785
1786 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1787 rt->rt6i_dst.plen = cfg->fc_dst_len;
1788 if (rt->rt6i_dst.plen == 128)
1789 rt->dst.flags |= DST_HOST;
1790
1791 #ifdef CONFIG_IPV6_SUBTREES
1792 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1793 rt->rt6i_src.plen = cfg->fc_src_len;
1794 #endif
1795
1796 rt->rt6i_metric = cfg->fc_metric;
1797
1798 /* We cannot add true routes via loopback here,
1799 they would result in kernel looping; promote them to reject routes
1800 */
1801 if ((cfg->fc_flags & RTF_REJECT) ||
1802 (dev && (dev->flags & IFF_LOOPBACK) &&
1803 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1804 !(cfg->fc_flags & RTF_LOCAL))) {
1805 /* hold loopback dev/idev if we haven't done so. */
1806 if (dev != net->loopback_dev) {
1807 if (dev) {
1808 dev_put(dev);
1809 in6_dev_put(idev);
1810 }
1811 dev = net->loopback_dev;
1812 dev_hold(dev);
1813 idev = in6_dev_get(dev);
1814 if (!idev) {
1815 err = -ENODEV;
1816 goto out;
1817 }
1818 }
1819 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1820 switch (cfg->fc_type) {
1821 case RTN_BLACKHOLE:
1822 rt->dst.error = -EINVAL;
1823 rt->dst.output = dst_discard_sk;
1824 rt->dst.input = dst_discard;
1825 break;
1826 case RTN_PROHIBIT:
1827 rt->dst.error = -EACCES;
1828 rt->dst.output = ip6_pkt_prohibit_out;
1829 rt->dst.input = ip6_pkt_prohibit;
1830 break;
1831 case RTN_THROW:
1832 default:
1833 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1834 : -ENETUNREACH;
1835 rt->dst.output = ip6_pkt_discard_out;
1836 rt->dst.input = ip6_pkt_discard;
1837 break;
1838 }
1839 goto install_route;
1840 }
1841
1842 if (cfg->fc_flags & RTF_GATEWAY) {
1843 const struct in6_addr *gw_addr;
1844 int gwa_type;
1845
1846 gw_addr = &cfg->fc_gateway;
1847
1848 /* if gw_addr is local we will fail to detect this in case
1849 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1850 * will return already-added prefix route via interface that
1851 * prefix route was assigned to, which might be non-loopback.
1852 */
1853 err = -EINVAL;
1854 if (ipv6_chk_addr_and_flags(net, gw_addr, NULL, 0, 0))
1855 goto out;
1856
1857 rt->rt6i_gateway = *gw_addr;
1858 gwa_type = ipv6_addr_type(gw_addr);
1859
1860 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1861 struct rt6_info *grt;
1862
1863 /* IPv6 strictly inhibits using not link-local
1864 addresses as nexthop address.
1865 Otherwise, router will not able to send redirects.
1866 It is very good, but in some (rare!) circumstances
1867 (SIT, PtP, NBMA NOARP links) it is handy to allow
1868 some exceptions. --ANK
1869 */
1870 if (!(gwa_type & IPV6_ADDR_UNICAST))
1871 goto out;
1872
1873 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1874
1875 err = -EHOSTUNREACH;
1876 if (!grt)
1877 goto out;
1878 if (dev) {
1879 if (dev != grt->dst.dev) {
1880 ip6_rt_put(grt);
1881 goto out;
1882 }
1883 } else {
1884 dev = grt->dst.dev;
1885 idev = grt->rt6i_idev;
1886 dev_hold(dev);
1887 in6_dev_hold(grt->rt6i_idev);
1888 }
1889 if (!(grt->rt6i_flags & RTF_GATEWAY))
1890 err = 0;
1891 ip6_rt_put(grt);
1892
1893 if (err)
1894 goto out;
1895 }
1896 err = -EINVAL;
1897 if (!dev || (dev->flags & IFF_LOOPBACK))
1898 goto out;
1899 }
1900
1901 err = -ENODEV;
1902 if (!dev)
1903 goto out;
1904
1905 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1906 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1907 err = -EINVAL;
1908 goto out;
1909 }
1910 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1911 rt->rt6i_prefsrc.plen = 128;
1912 } else
1913 rt->rt6i_prefsrc.plen = 0;
1914
1915 rt->rt6i_flags = cfg->fc_flags;
1916
1917 install_route:
1918 rt->dst.dev = dev;
1919 rt->rt6i_idev = idev;
1920 rt->rt6i_table = table;
1921
1922 cfg->fc_nlinfo.nl_net = dev_net(dev);
1923
1924 err = ip6_convert_metrics(&mxc, cfg);
1925 if (err)
1926 goto out;
1927
1928 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
1929
1930 kfree(mxc.mx);
1931 return err;
1932 out:
1933 if (dev)
1934 dev_put(dev);
1935 if (idev)
1936 in6_dev_put(idev);
1937 if (rt)
1938 dst_free(&rt->dst);
1939 return err;
1940 }
1941
1942 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1943 {
1944 int err;
1945 struct fib6_table *table;
1946 struct net *net = dev_net(rt->dst.dev);
1947
1948 if (rt == net->ipv6.ip6_null_entry) {
1949 err = -ENOENT;
1950 goto out;
1951 }
1952
1953 table = rt->rt6i_table;
1954 write_lock_bh(&table->tb6_lock);
1955 err = fib6_del(rt, info);
1956 write_unlock_bh(&table->tb6_lock);
1957
1958 out:
1959 ip6_rt_put(rt);
1960 return err;
1961 }
1962
1963 int ip6_del_rt(struct rt6_info *rt)
1964 {
1965 struct nl_info info = {
1966 .nl_net = dev_net(rt->dst.dev),
1967 };
1968 return __ip6_del_rt(rt, &info);
1969 }
1970
1971 static int ip6_route_del(struct fib6_config *cfg)
1972 {
1973 struct fib6_table *table;
1974 struct fib6_node *fn;
1975 struct rt6_info *rt;
1976 int err = -ESRCH;
1977
1978 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1979 if (!table)
1980 return err;
1981
1982 read_lock_bh(&table->tb6_lock);
1983
1984 fn = fib6_locate(&table->tb6_root,
1985 &cfg->fc_dst, cfg->fc_dst_len,
1986 &cfg->fc_src, cfg->fc_src_len);
1987
1988 if (fn) {
1989 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1990 if ((rt->rt6i_flags & RTF_CACHE) &&
1991 !(cfg->fc_flags & RTF_CACHE))
1992 continue;
1993 if (cfg->fc_ifindex &&
1994 (!rt->dst.dev ||
1995 rt->dst.dev->ifindex != cfg->fc_ifindex))
1996 continue;
1997 if (cfg->fc_flags & RTF_GATEWAY &&
1998 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1999 continue;
2000 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2001 continue;
2002 dst_hold(&rt->dst);
2003 read_unlock_bh(&table->tb6_lock);
2004
2005 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2006 }
2007 }
2008 read_unlock_bh(&table->tb6_lock);
2009
2010 return err;
2011 }
2012
2013 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2014 {
2015 struct net *net = dev_net(skb->dev);
2016 struct netevent_redirect netevent;
2017 struct rt6_info *rt, *nrt = NULL;
2018 struct ndisc_options ndopts;
2019 struct inet6_dev *in6_dev;
2020 struct neighbour *neigh;
2021 struct rd_msg *msg;
2022 int optlen, on_link;
2023 u8 *lladdr;
2024
2025 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2026 optlen -= sizeof(*msg);
2027
2028 if (optlen < 0) {
2029 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2030 return;
2031 }
2032
2033 msg = (struct rd_msg *)icmp6_hdr(skb);
2034
2035 if (ipv6_addr_is_multicast(&msg->dest)) {
2036 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2037 return;
2038 }
2039
2040 on_link = 0;
2041 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2042 on_link = 1;
2043 } else if (ipv6_addr_type(&msg->target) !=
2044 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2045 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2046 return;
2047 }
2048
2049 in6_dev = __in6_dev_get(skb->dev);
2050 if (!in6_dev)
2051 return;
2052 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2053 return;
2054
2055 /* RFC2461 8.1:
2056 * The IP source address of the Redirect MUST be the same as the current
2057 * first-hop router for the specified ICMP Destination Address.
2058 */
2059
2060 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
2061 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2062 return;
2063 }
2064
2065 lladdr = NULL;
2066 if (ndopts.nd_opts_tgt_lladdr) {
2067 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2068 skb->dev);
2069 if (!lladdr) {
2070 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2071 return;
2072 }
2073 }
2074
2075 rt = (struct rt6_info *) dst;
2076 if (rt == net->ipv6.ip6_null_entry) {
2077 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2078 return;
2079 }
2080
2081 /* Redirect received -> path was valid.
2082 * Look, redirects are sent only in response to data packets,
2083 * so that this nexthop apparently is reachable. --ANK
2084 */
2085 dst_confirm(&rt->dst);
2086
2087 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2088 if (!neigh)
2089 return;
2090
2091 /*
2092 * We have finally decided to accept it.
2093 */
2094
2095 neigh_update(neigh, lladdr, NUD_STALE,
2096 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2097 NEIGH_UPDATE_F_OVERRIDE|
2098 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2099 NEIGH_UPDATE_F_ISROUTER))
2100 );
2101
2102 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2103 if (!nrt)
2104 goto out;
2105
2106 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2107 if (on_link)
2108 nrt->rt6i_flags &= ~RTF_GATEWAY;
2109
2110 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2111
2112 if (ip6_ins_rt(nrt))
2113 goto out;
2114
2115 netevent.old = &rt->dst;
2116 netevent.new = &nrt->dst;
2117 netevent.daddr = &msg->dest;
2118 netevent.neigh = neigh;
2119 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2120
2121 if (rt->rt6i_flags & RTF_CACHE) {
2122 rt = (struct rt6_info *) dst_clone(&rt->dst);
2123 ip6_del_rt(rt);
2124 }
2125
2126 out:
2127 neigh_release(neigh);
2128 }
2129
2130 /*
2131 * Misc support functions
2132 */
2133
2134 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2135 {
2136 BUG_ON(from->dst.from);
2137
2138 rt->rt6i_flags &= ~RTF_EXPIRES;
2139 dst_hold(&from->dst);
2140 rt->dst.from = &from->dst;
2141 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2142 }
2143
2144 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2145 {
2146 rt->dst.input = ort->dst.input;
2147 rt->dst.output = ort->dst.output;
2148 rt->rt6i_dst = ort->rt6i_dst;
2149 rt->dst.error = ort->dst.error;
2150 rt->rt6i_idev = ort->rt6i_idev;
2151 if (rt->rt6i_idev)
2152 in6_dev_hold(rt->rt6i_idev);
2153 rt->dst.lastuse = jiffies;
2154 rt->rt6i_gateway = ort->rt6i_gateway;
2155 rt->rt6i_flags = ort->rt6i_flags;
2156 rt6_set_from(rt, ort);
2157 rt->rt6i_metric = ort->rt6i_metric;
2158 #ifdef CONFIG_IPV6_SUBTREES
2159 rt->rt6i_src = ort->rt6i_src;
2160 #endif
2161 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2162 rt->rt6i_table = ort->rt6i_table;
2163 rt->rt6i_lwtstate = lwtstate_get(ort->rt6i_lwtstate);
2164 }
2165
2166 #ifdef CONFIG_IPV6_ROUTE_INFO
2167 static struct rt6_info *rt6_get_route_info(struct net *net,
2168 const struct in6_addr *prefix, int prefixlen,
2169 const struct in6_addr *gwaddr, int ifindex)
2170 {
2171 struct fib6_node *fn;
2172 struct rt6_info *rt = NULL;
2173 struct fib6_table *table;
2174
2175 table = fib6_get_table(net, RT6_TABLE_INFO);
2176 if (!table)
2177 return NULL;
2178
2179 read_lock_bh(&table->tb6_lock);
2180 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2181 if (!fn)
2182 goto out;
2183
2184 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2185 if (rt->dst.dev->ifindex != ifindex)
2186 continue;
2187 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2188 continue;
2189 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2190 continue;
2191 dst_hold(&rt->dst);
2192 break;
2193 }
2194 out:
2195 read_unlock_bh(&table->tb6_lock);
2196 return rt;
2197 }
2198
2199 static struct rt6_info *rt6_add_route_info(struct net *net,
2200 const struct in6_addr *prefix, int prefixlen,
2201 const struct in6_addr *gwaddr, int ifindex,
2202 unsigned int pref)
2203 {
2204 struct fib6_config cfg = {
2205 .fc_table = RT6_TABLE_INFO,
2206 .fc_metric = IP6_RT_PRIO_USER,
2207 .fc_ifindex = ifindex,
2208 .fc_dst_len = prefixlen,
2209 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2210 RTF_UP | RTF_PREF(pref),
2211 .fc_nlinfo.portid = 0,
2212 .fc_nlinfo.nlh = NULL,
2213 .fc_nlinfo.nl_net = net,
2214 };
2215
2216 cfg.fc_dst = *prefix;
2217 cfg.fc_gateway = *gwaddr;
2218
2219 /* We should treat it as a default route if prefix length is 0. */
2220 if (!prefixlen)
2221 cfg.fc_flags |= RTF_DEFAULT;
2222
2223 ip6_route_add(&cfg);
2224
2225 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
2226 }
2227 #endif
2228
2229 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2230 {
2231 struct rt6_info *rt;
2232 struct fib6_table *table;
2233
2234 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
2235 if (!table)
2236 return NULL;
2237
2238 read_lock_bh(&table->tb6_lock);
2239 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2240 if (dev == rt->dst.dev &&
2241 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2242 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2243 break;
2244 }
2245 if (rt)
2246 dst_hold(&rt->dst);
2247 read_unlock_bh(&table->tb6_lock);
2248 return rt;
2249 }
2250
2251 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2252 struct net_device *dev,
2253 unsigned int pref)
2254 {
2255 struct fib6_config cfg = {
2256 .fc_table = RT6_TABLE_DFLT,
2257 .fc_metric = IP6_RT_PRIO_USER,
2258 .fc_ifindex = dev->ifindex,
2259 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2260 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2261 .fc_nlinfo.portid = 0,
2262 .fc_nlinfo.nlh = NULL,
2263 .fc_nlinfo.nl_net = dev_net(dev),
2264 };
2265
2266 cfg.fc_gateway = *gwaddr;
2267
2268 ip6_route_add(&cfg);
2269
2270 return rt6_get_dflt_router(gwaddr, dev);
2271 }
2272
2273 void rt6_purge_dflt_routers(struct net *net)
2274 {
2275 struct rt6_info *rt;
2276 struct fib6_table *table;
2277
2278 /* NOTE: Keep consistent with rt6_get_dflt_router */
2279 table = fib6_get_table(net, RT6_TABLE_DFLT);
2280 if (!table)
2281 return;
2282
2283 restart:
2284 read_lock_bh(&table->tb6_lock);
2285 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2286 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2287 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2288 dst_hold(&rt->dst);
2289 read_unlock_bh(&table->tb6_lock);
2290 ip6_del_rt(rt);
2291 goto restart;
2292 }
2293 }
2294 read_unlock_bh(&table->tb6_lock);
2295 }
2296
2297 static void rtmsg_to_fib6_config(struct net *net,
2298 struct in6_rtmsg *rtmsg,
2299 struct fib6_config *cfg)
2300 {
2301 memset(cfg, 0, sizeof(*cfg));
2302
2303 cfg->fc_table = RT6_TABLE_MAIN;
2304 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2305 cfg->fc_metric = rtmsg->rtmsg_metric;
2306 cfg->fc_expires = rtmsg->rtmsg_info;
2307 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2308 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2309 cfg->fc_flags = rtmsg->rtmsg_flags;
2310
2311 cfg->fc_nlinfo.nl_net = net;
2312
2313 cfg->fc_dst = rtmsg->rtmsg_dst;
2314 cfg->fc_src = rtmsg->rtmsg_src;
2315 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2316 }
2317
2318 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2319 {
2320 struct fib6_config cfg;
2321 struct in6_rtmsg rtmsg;
2322 int err;
2323
2324 switch (cmd) {
2325 case SIOCADDRT: /* Add a route */
2326 case SIOCDELRT: /* Delete a route */
2327 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2328 return -EPERM;
2329 err = copy_from_user(&rtmsg, arg,
2330 sizeof(struct in6_rtmsg));
2331 if (err)
2332 return -EFAULT;
2333
2334 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2335
2336 rtnl_lock();
2337 switch (cmd) {
2338 case SIOCADDRT:
2339 err = ip6_route_add(&cfg);
2340 break;
2341 case SIOCDELRT:
2342 err = ip6_route_del(&cfg);
2343 break;
2344 default:
2345 err = -EINVAL;
2346 }
2347 rtnl_unlock();
2348
2349 return err;
2350 }
2351
2352 return -EINVAL;
2353 }
2354
2355 /*
2356 * Drop the packet on the floor
2357 */
2358
2359 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2360 {
2361 int type;
2362 struct dst_entry *dst = skb_dst(skb);
2363 switch (ipstats_mib_noroutes) {
2364 case IPSTATS_MIB_INNOROUTES:
2365 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2366 if (type == IPV6_ADDR_ANY) {
2367 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2368 IPSTATS_MIB_INADDRERRORS);
2369 break;
2370 }
2371 /* FALLTHROUGH */
2372 case IPSTATS_MIB_OUTNOROUTES:
2373 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2374 ipstats_mib_noroutes);
2375 break;
2376 }
2377 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2378 kfree_skb(skb);
2379 return 0;
2380 }
2381
2382 static int ip6_pkt_discard(struct sk_buff *skb)
2383 {
2384 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2385 }
2386
2387 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
2388 {
2389 skb->dev = skb_dst(skb)->dev;
2390 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2391 }
2392
2393 static int ip6_pkt_prohibit(struct sk_buff *skb)
2394 {
2395 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2396 }
2397
2398 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
2399 {
2400 skb->dev = skb_dst(skb)->dev;
2401 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2402 }
2403
2404 /*
2405 * Allocate a dst for local (unicast / anycast) address.
2406 */
2407
2408 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2409 const struct in6_addr *addr,
2410 bool anycast)
2411 {
2412 struct net *net = dev_net(idev->dev);
2413 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2414 DST_NOCOUNT, NULL);
2415 if (!rt)
2416 return ERR_PTR(-ENOMEM);
2417
2418 in6_dev_hold(idev);
2419
2420 rt->dst.flags |= DST_HOST;
2421 rt->dst.input = ip6_input;
2422 rt->dst.output = ip6_output;
2423 rt->rt6i_idev = idev;
2424
2425 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2426 if (anycast)
2427 rt->rt6i_flags |= RTF_ANYCAST;
2428 else
2429 rt->rt6i_flags |= RTF_LOCAL;
2430
2431 rt->rt6i_gateway = *addr;
2432 rt->rt6i_dst.addr = *addr;
2433 rt->rt6i_dst.plen = 128;
2434 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2435
2436 atomic_set(&rt->dst.__refcnt, 1);
2437
2438 return rt;
2439 }
2440
2441 int ip6_route_get_saddr(struct net *net,
2442 struct rt6_info *rt,
2443 const struct in6_addr *daddr,
2444 unsigned int prefs,
2445 struct in6_addr *saddr)
2446 {
2447 struct inet6_dev *idev =
2448 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
2449 int err = 0;
2450 if (rt && rt->rt6i_prefsrc.plen)
2451 *saddr = rt->rt6i_prefsrc.addr;
2452 else
2453 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2454 daddr, prefs, saddr);
2455 return err;
2456 }
2457
2458 /* remove deleted ip from prefsrc entries */
2459 struct arg_dev_net_ip {
2460 struct net_device *dev;
2461 struct net *net;
2462 struct in6_addr *addr;
2463 };
2464
2465 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2466 {
2467 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2468 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2469 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2470
2471 if (((void *)rt->dst.dev == dev || !dev) &&
2472 rt != net->ipv6.ip6_null_entry &&
2473 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2474 /* remove prefsrc entry */
2475 rt->rt6i_prefsrc.plen = 0;
2476 }
2477 return 0;
2478 }
2479
2480 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2481 {
2482 struct net *net = dev_net(ifp->idev->dev);
2483 struct arg_dev_net_ip adni = {
2484 .dev = ifp->idev->dev,
2485 .net = net,
2486 .addr = &ifp->addr,
2487 };
2488 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2489 }
2490
2491 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2492 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2493
2494 /* Remove routers and update dst entries when gateway turn into host. */
2495 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2496 {
2497 struct in6_addr *gateway = (struct in6_addr *)arg;
2498
2499 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2500 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2501 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2502 return -1;
2503 }
2504 return 0;
2505 }
2506
2507 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2508 {
2509 fib6_clean_all(net, fib6_clean_tohost, gateway);
2510 }
2511
2512 struct arg_dev_net {
2513 struct net_device *dev;
2514 struct net *net;
2515 };
2516
2517 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2518 {
2519 const struct arg_dev_net *adn = arg;
2520 const struct net_device *dev = adn->dev;
2521
2522 if ((rt->dst.dev == dev || !dev) &&
2523 rt != adn->net->ipv6.ip6_null_entry)
2524 return -1;
2525
2526 return 0;
2527 }
2528
2529 void rt6_ifdown(struct net *net, struct net_device *dev)
2530 {
2531 struct arg_dev_net adn = {
2532 .dev = dev,
2533 .net = net,
2534 };
2535
2536 fib6_clean_all(net, fib6_ifdown, &adn);
2537 icmp6_clean_all(fib6_ifdown, &adn);
2538 rt6_uncached_list_flush_dev(net, dev);
2539 }
2540
2541 struct rt6_mtu_change_arg {
2542 struct net_device *dev;
2543 unsigned int mtu;
2544 };
2545
2546 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2547 {
2548 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2549 struct inet6_dev *idev;
2550
2551 /* In IPv6 pmtu discovery is not optional,
2552 so that RTAX_MTU lock cannot disable it.
2553 We still use this lock to block changes
2554 caused by addrconf/ndisc.
2555 */
2556
2557 idev = __in6_dev_get(arg->dev);
2558 if (!idev)
2559 return 0;
2560
2561 /* For administrative MTU increase, there is no way to discover
2562 IPv6 PMTU increase, so PMTU increase should be updated here.
2563 Since RFC 1981 doesn't include administrative MTU increase
2564 update PMTU increase is a MUST. (i.e. jumbo frame)
2565 */
2566 /*
2567 If new MTU is less than route PMTU, this new MTU will be the
2568 lowest MTU in the path, update the route PMTU to reflect PMTU
2569 decreases; if new MTU is greater than route PMTU, and the
2570 old MTU is the lowest MTU in the path, update the route PMTU
2571 to reflect the increase. In this case if the other nodes' MTU
2572 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2573 PMTU discouvery.
2574 */
2575 if (rt->dst.dev == arg->dev &&
2576 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2577 if (rt->rt6i_flags & RTF_CACHE) {
2578 /* For RTF_CACHE with rt6i_pmtu == 0
2579 * (i.e. a redirected route),
2580 * the metrics of its rt->dst.from has already
2581 * been updated.
2582 */
2583 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2584 rt->rt6i_pmtu = arg->mtu;
2585 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2586 (dst_mtu(&rt->dst) < arg->mtu &&
2587 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2588 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2589 }
2590 }
2591 return 0;
2592 }
2593
2594 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2595 {
2596 struct rt6_mtu_change_arg arg = {
2597 .dev = dev,
2598 .mtu = mtu,
2599 };
2600
2601 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2602 }
2603
2604 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2605 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2606 [RTA_OIF] = { .type = NLA_U32 },
2607 [RTA_IIF] = { .type = NLA_U32 },
2608 [RTA_PRIORITY] = { .type = NLA_U32 },
2609 [RTA_METRICS] = { .type = NLA_NESTED },
2610 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2611 [RTA_PREF] = { .type = NLA_U8 },
2612 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2613 [RTA_ENCAP] = { .type = NLA_NESTED },
2614 };
2615
2616 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2617 struct fib6_config *cfg)
2618 {
2619 struct rtmsg *rtm;
2620 struct nlattr *tb[RTA_MAX+1];
2621 unsigned int pref;
2622 int err;
2623
2624 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2625 if (err < 0)
2626 goto errout;
2627
2628 err = -EINVAL;
2629 rtm = nlmsg_data(nlh);
2630 memset(cfg, 0, sizeof(*cfg));
2631
2632 cfg->fc_table = rtm->rtm_table;
2633 cfg->fc_dst_len = rtm->rtm_dst_len;
2634 cfg->fc_src_len = rtm->rtm_src_len;
2635 cfg->fc_flags = RTF_UP;
2636 cfg->fc_protocol = rtm->rtm_protocol;
2637 cfg->fc_type = rtm->rtm_type;
2638
2639 if (rtm->rtm_type == RTN_UNREACHABLE ||
2640 rtm->rtm_type == RTN_BLACKHOLE ||
2641 rtm->rtm_type == RTN_PROHIBIT ||
2642 rtm->rtm_type == RTN_THROW)
2643 cfg->fc_flags |= RTF_REJECT;
2644
2645 if (rtm->rtm_type == RTN_LOCAL)
2646 cfg->fc_flags |= RTF_LOCAL;
2647
2648 if (rtm->rtm_flags & RTM_F_CLONED)
2649 cfg->fc_flags |= RTF_CACHE;
2650
2651 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2652 cfg->fc_nlinfo.nlh = nlh;
2653 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2654
2655 if (tb[RTA_GATEWAY]) {
2656 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2657 cfg->fc_flags |= RTF_GATEWAY;
2658 }
2659
2660 if (tb[RTA_DST]) {
2661 int plen = (rtm->rtm_dst_len + 7) >> 3;
2662
2663 if (nla_len(tb[RTA_DST]) < plen)
2664 goto errout;
2665
2666 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2667 }
2668
2669 if (tb[RTA_SRC]) {
2670 int plen = (rtm->rtm_src_len + 7) >> 3;
2671
2672 if (nla_len(tb[RTA_SRC]) < plen)
2673 goto errout;
2674
2675 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2676 }
2677
2678 if (tb[RTA_PREFSRC])
2679 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2680
2681 if (tb[RTA_OIF])
2682 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2683
2684 if (tb[RTA_PRIORITY])
2685 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2686
2687 if (tb[RTA_METRICS]) {
2688 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2689 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2690 }
2691
2692 if (tb[RTA_TABLE])
2693 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2694
2695 if (tb[RTA_MULTIPATH]) {
2696 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2697 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2698 }
2699
2700 if (tb[RTA_PREF]) {
2701 pref = nla_get_u8(tb[RTA_PREF]);
2702 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2703 pref != ICMPV6_ROUTER_PREF_HIGH)
2704 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2705 cfg->fc_flags |= RTF_PREF(pref);
2706 }
2707
2708 if (tb[RTA_ENCAP])
2709 cfg->fc_encap = tb[RTA_ENCAP];
2710
2711 if (tb[RTA_ENCAP_TYPE])
2712 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2713
2714 err = 0;
2715 errout:
2716 return err;
2717 }
2718
2719 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2720 {
2721 struct fib6_config r_cfg;
2722 struct rtnexthop *rtnh;
2723 int remaining;
2724 int attrlen;
2725 int err = 0, last_err = 0;
2726
2727 remaining = cfg->fc_mp_len;
2728 beginning:
2729 rtnh = (struct rtnexthop *)cfg->fc_mp;
2730
2731 /* Parse a Multipath Entry */
2732 while (rtnh_ok(rtnh, remaining)) {
2733 memcpy(&r_cfg, cfg, sizeof(*cfg));
2734 if (rtnh->rtnh_ifindex)
2735 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2736
2737 attrlen = rtnh_attrlen(rtnh);
2738 if (attrlen > 0) {
2739 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2740
2741 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2742 if (nla) {
2743 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2744 r_cfg.fc_flags |= RTF_GATEWAY;
2745 }
2746 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2747 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2748 if (nla)
2749 r_cfg.fc_encap_type = nla_get_u16(nla);
2750 }
2751 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2752 if (err) {
2753 last_err = err;
2754 /* If we are trying to remove a route, do not stop the
2755 * loop when ip6_route_del() fails (because next hop is
2756 * already gone), we should try to remove all next hops.
2757 */
2758 if (add) {
2759 /* If add fails, we should try to delete all
2760 * next hops that have been already added.
2761 */
2762 add = 0;
2763 remaining = cfg->fc_mp_len - remaining;
2764 goto beginning;
2765 }
2766 }
2767 /* Because each route is added like a single route we remove
2768 * these flags after the first nexthop: if there is a collision,
2769 * we have already failed to add the first nexthop:
2770 * fib6_add_rt2node() has rejected it; when replacing, old
2771 * nexthops have been replaced by first new, the rest should
2772 * be added to it.
2773 */
2774 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2775 NLM_F_REPLACE);
2776 rtnh = rtnh_next(rtnh, &remaining);
2777 }
2778
2779 return last_err;
2780 }
2781
2782 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2783 {
2784 struct fib6_config cfg;
2785 int err;
2786
2787 err = rtm_to_fib6_config(skb, nlh, &cfg);
2788 if (err < 0)
2789 return err;
2790
2791 if (cfg.fc_mp)
2792 return ip6_route_multipath(&cfg, 0);
2793 else
2794 return ip6_route_del(&cfg);
2795 }
2796
2797 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2798 {
2799 struct fib6_config cfg;
2800 int err;
2801
2802 err = rtm_to_fib6_config(skb, nlh, &cfg);
2803 if (err < 0)
2804 return err;
2805
2806 if (cfg.fc_mp)
2807 return ip6_route_multipath(&cfg, 1);
2808 else
2809 return ip6_route_add(&cfg);
2810 }
2811
2812 static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
2813 {
2814 return NLMSG_ALIGN(sizeof(struct rtmsg))
2815 + nla_total_size(16) /* RTA_SRC */
2816 + nla_total_size(16) /* RTA_DST */
2817 + nla_total_size(16) /* RTA_GATEWAY */
2818 + nla_total_size(16) /* RTA_PREFSRC */
2819 + nla_total_size(4) /* RTA_TABLE */
2820 + nla_total_size(4) /* RTA_IIF */
2821 + nla_total_size(4) /* RTA_OIF */
2822 + nla_total_size(4) /* RTA_PRIORITY */
2823 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2824 + nla_total_size(sizeof(struct rta_cacheinfo))
2825 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
2826 + nla_total_size(1) /* RTA_PREF */
2827 + lwtunnel_get_encap_size(rt->rt6i_lwtstate);
2828 }
2829
2830 static int rt6_fill_node(struct net *net,
2831 struct sk_buff *skb, struct rt6_info *rt,
2832 struct in6_addr *dst, struct in6_addr *src,
2833 int iif, int type, u32 portid, u32 seq,
2834 int prefix, int nowait, unsigned int flags)
2835 {
2836 u32 metrics[RTAX_MAX];
2837 struct rtmsg *rtm;
2838 struct nlmsghdr *nlh;
2839 long expires;
2840 u32 table;
2841
2842 if (prefix) { /* user wants prefix routes only */
2843 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2844 /* success since this is not a prefix route */
2845 return 1;
2846 }
2847 }
2848
2849 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2850 if (!nlh)
2851 return -EMSGSIZE;
2852
2853 rtm = nlmsg_data(nlh);
2854 rtm->rtm_family = AF_INET6;
2855 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2856 rtm->rtm_src_len = rt->rt6i_src.plen;
2857 rtm->rtm_tos = 0;
2858 if (rt->rt6i_table)
2859 table = rt->rt6i_table->tb6_id;
2860 else
2861 table = RT6_TABLE_UNSPEC;
2862 rtm->rtm_table = table;
2863 if (nla_put_u32(skb, RTA_TABLE, table))
2864 goto nla_put_failure;
2865 if (rt->rt6i_flags & RTF_REJECT) {
2866 switch (rt->dst.error) {
2867 case -EINVAL:
2868 rtm->rtm_type = RTN_BLACKHOLE;
2869 break;
2870 case -EACCES:
2871 rtm->rtm_type = RTN_PROHIBIT;
2872 break;
2873 case -EAGAIN:
2874 rtm->rtm_type = RTN_THROW;
2875 break;
2876 default:
2877 rtm->rtm_type = RTN_UNREACHABLE;
2878 break;
2879 }
2880 }
2881 else if (rt->rt6i_flags & RTF_LOCAL)
2882 rtm->rtm_type = RTN_LOCAL;
2883 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2884 rtm->rtm_type = RTN_LOCAL;
2885 else
2886 rtm->rtm_type = RTN_UNICAST;
2887 rtm->rtm_flags = 0;
2888 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2889 rtm->rtm_protocol = rt->rt6i_protocol;
2890 if (rt->rt6i_flags & RTF_DYNAMIC)
2891 rtm->rtm_protocol = RTPROT_REDIRECT;
2892 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2893 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2894 rtm->rtm_protocol = RTPROT_RA;
2895 else
2896 rtm->rtm_protocol = RTPROT_KERNEL;
2897 }
2898
2899 if (rt->rt6i_flags & RTF_CACHE)
2900 rtm->rtm_flags |= RTM_F_CLONED;
2901
2902 if (dst) {
2903 if (nla_put_in6_addr(skb, RTA_DST, dst))
2904 goto nla_put_failure;
2905 rtm->rtm_dst_len = 128;
2906 } else if (rtm->rtm_dst_len)
2907 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
2908 goto nla_put_failure;
2909 #ifdef CONFIG_IPV6_SUBTREES
2910 if (src) {
2911 if (nla_put_in6_addr(skb, RTA_SRC, src))
2912 goto nla_put_failure;
2913 rtm->rtm_src_len = 128;
2914 } else if (rtm->rtm_src_len &&
2915 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
2916 goto nla_put_failure;
2917 #endif
2918 if (iif) {
2919 #ifdef CONFIG_IPV6_MROUTE
2920 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2921 int err = ip6mr_get_route(net, skb, rtm, nowait);
2922 if (err <= 0) {
2923 if (!nowait) {
2924 if (err == 0)
2925 return 0;
2926 goto nla_put_failure;
2927 } else {
2928 if (err == -EMSGSIZE)
2929 goto nla_put_failure;
2930 }
2931 }
2932 } else
2933 #endif
2934 if (nla_put_u32(skb, RTA_IIF, iif))
2935 goto nla_put_failure;
2936 } else if (dst) {
2937 struct in6_addr saddr_buf;
2938 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2939 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
2940 goto nla_put_failure;
2941 }
2942
2943 if (rt->rt6i_prefsrc.plen) {
2944 struct in6_addr saddr_buf;
2945 saddr_buf = rt->rt6i_prefsrc.addr;
2946 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
2947 goto nla_put_failure;
2948 }
2949
2950 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
2951 if (rt->rt6i_pmtu)
2952 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
2953 if (rtnetlink_put_metrics(skb, metrics) < 0)
2954 goto nla_put_failure;
2955
2956 if (rt->rt6i_flags & RTF_GATEWAY) {
2957 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
2958 goto nla_put_failure;
2959 }
2960
2961 if (rt->dst.dev &&
2962 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2963 goto nla_put_failure;
2964 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2965 goto nla_put_failure;
2966
2967 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2968
2969 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2970 goto nla_put_failure;
2971
2972 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
2973 goto nla_put_failure;
2974
2975 lwtunnel_fill_encap(skb, rt->rt6i_lwtstate);
2976
2977 nlmsg_end(skb, nlh);
2978 return 0;
2979
2980 nla_put_failure:
2981 nlmsg_cancel(skb, nlh);
2982 return -EMSGSIZE;
2983 }
2984
2985 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2986 {
2987 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2988 int prefix;
2989
2990 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2991 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2992 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2993 } else
2994 prefix = 0;
2995
2996 return rt6_fill_node(arg->net,
2997 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2998 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2999 prefix, 0, NLM_F_MULTI);
3000 }
3001
3002 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3003 {
3004 struct net *net = sock_net(in_skb->sk);
3005 struct nlattr *tb[RTA_MAX+1];
3006 struct rt6_info *rt;
3007 struct sk_buff *skb;
3008 struct rtmsg *rtm;
3009 struct flowi6 fl6;
3010 int err, iif = 0, oif = 0;
3011
3012 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3013 if (err < 0)
3014 goto errout;
3015
3016 err = -EINVAL;
3017 memset(&fl6, 0, sizeof(fl6));
3018
3019 if (tb[RTA_SRC]) {
3020 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3021 goto errout;
3022
3023 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3024 }
3025
3026 if (tb[RTA_DST]) {
3027 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3028 goto errout;
3029
3030 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3031 }
3032
3033 if (tb[RTA_IIF])
3034 iif = nla_get_u32(tb[RTA_IIF]);
3035
3036 if (tb[RTA_OIF])
3037 oif = nla_get_u32(tb[RTA_OIF]);
3038
3039 if (tb[RTA_MARK])
3040 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3041
3042 if (iif) {
3043 struct net_device *dev;
3044 int flags = 0;
3045
3046 dev = __dev_get_by_index(net, iif);
3047 if (!dev) {
3048 err = -ENODEV;
3049 goto errout;
3050 }
3051
3052 fl6.flowi6_iif = iif;
3053
3054 if (!ipv6_addr_any(&fl6.saddr))
3055 flags |= RT6_LOOKUP_F_HAS_SADDR;
3056
3057 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3058 flags);
3059 } else {
3060 fl6.flowi6_oif = oif;
3061
3062 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3063 }
3064
3065 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3066 if (!skb) {
3067 ip6_rt_put(rt);
3068 err = -ENOBUFS;
3069 goto errout;
3070 }
3071
3072 /* Reserve room for dummy headers, this skb can pass
3073 through good chunk of routing engine.
3074 */
3075 skb_reset_mac_header(skb);
3076 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3077
3078 skb_dst_set(skb, &rt->dst);
3079
3080 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3081 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3082 nlh->nlmsg_seq, 0, 0, 0);
3083 if (err < 0) {
3084 kfree_skb(skb);
3085 goto errout;
3086 }
3087
3088 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3089 errout:
3090 return err;
3091 }
3092
3093 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
3094 {
3095 struct sk_buff *skb;
3096 struct net *net = info->nl_net;
3097 u32 seq;
3098 int err;
3099
3100 err = -ENOBUFS;
3101 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3102
3103 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3104 if (!skb)
3105 goto errout;
3106
3107 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3108 event, info->portid, seq, 0, 0, 0);
3109 if (err < 0) {
3110 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3111 WARN_ON(err == -EMSGSIZE);
3112 kfree_skb(skb);
3113 goto errout;
3114 }
3115 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3116 info->nlh, gfp_any());
3117 return;
3118 errout:
3119 if (err < 0)
3120 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3121 }
3122
3123 static int ip6_route_dev_notify(struct notifier_block *this,
3124 unsigned long event, void *ptr)
3125 {
3126 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3127 struct net *net = dev_net(dev);
3128
3129 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3130 net->ipv6.ip6_null_entry->dst.dev = dev;
3131 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3132 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3133 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3134 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3135 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3136 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3137 #endif
3138 }
3139
3140 return NOTIFY_OK;
3141 }
3142
3143 /*
3144 * /proc
3145 */
3146
3147 #ifdef CONFIG_PROC_FS
3148
3149 static const struct file_operations ipv6_route_proc_fops = {
3150 .owner = THIS_MODULE,
3151 .open = ipv6_route_open,
3152 .read = seq_read,
3153 .llseek = seq_lseek,
3154 .release = seq_release_net,
3155 };
3156
3157 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3158 {
3159 struct net *net = (struct net *)seq->private;
3160 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3161 net->ipv6.rt6_stats->fib_nodes,
3162 net->ipv6.rt6_stats->fib_route_nodes,
3163 net->ipv6.rt6_stats->fib_rt_alloc,
3164 net->ipv6.rt6_stats->fib_rt_entries,
3165 net->ipv6.rt6_stats->fib_rt_cache,
3166 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3167 net->ipv6.rt6_stats->fib_discarded_routes);
3168
3169 return 0;
3170 }
3171
3172 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3173 {
3174 return single_open_net(inode, file, rt6_stats_seq_show);
3175 }
3176
3177 static const struct file_operations rt6_stats_seq_fops = {
3178 .owner = THIS_MODULE,
3179 .open = rt6_stats_seq_open,
3180 .read = seq_read,
3181 .llseek = seq_lseek,
3182 .release = single_release_net,
3183 };
3184 #endif /* CONFIG_PROC_FS */
3185
3186 #ifdef CONFIG_SYSCTL
3187
3188 static
3189 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3190 void __user *buffer, size_t *lenp, loff_t *ppos)
3191 {
3192 struct net *net;
3193 int delay;
3194 if (!write)
3195 return -EINVAL;
3196
3197 net = (struct net *)ctl->extra1;
3198 delay = net->ipv6.sysctl.flush_delay;
3199 proc_dointvec(ctl, write, buffer, lenp, ppos);
3200 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3201 return 0;
3202 }
3203
3204 struct ctl_table ipv6_route_table_template[] = {
3205 {
3206 .procname = "flush",
3207 .data = &init_net.ipv6.sysctl.flush_delay,
3208 .maxlen = sizeof(int),
3209 .mode = 0200,
3210 .proc_handler = ipv6_sysctl_rtcache_flush
3211 },
3212 {
3213 .procname = "gc_thresh",
3214 .data = &ip6_dst_ops_template.gc_thresh,
3215 .maxlen = sizeof(int),
3216 .mode = 0644,
3217 .proc_handler = proc_dointvec,
3218 },
3219 {
3220 .procname = "max_size",
3221 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3222 .maxlen = sizeof(int),
3223 .mode = 0644,
3224 .proc_handler = proc_dointvec,
3225 },
3226 {
3227 .procname = "gc_min_interval",
3228 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3229 .maxlen = sizeof(int),
3230 .mode = 0644,
3231 .proc_handler = proc_dointvec_jiffies,
3232 },
3233 {
3234 .procname = "gc_timeout",
3235 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3236 .maxlen = sizeof(int),
3237 .mode = 0644,
3238 .proc_handler = proc_dointvec_jiffies,
3239 },
3240 {
3241 .procname = "gc_interval",
3242 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3243 .maxlen = sizeof(int),
3244 .mode = 0644,
3245 .proc_handler = proc_dointvec_jiffies,
3246 },
3247 {
3248 .procname = "gc_elasticity",
3249 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3250 .maxlen = sizeof(int),
3251 .mode = 0644,
3252 .proc_handler = proc_dointvec,
3253 },
3254 {
3255 .procname = "mtu_expires",
3256 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3257 .maxlen = sizeof(int),
3258 .mode = 0644,
3259 .proc_handler = proc_dointvec_jiffies,
3260 },
3261 {
3262 .procname = "min_adv_mss",
3263 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3264 .maxlen = sizeof(int),
3265 .mode = 0644,
3266 .proc_handler = proc_dointvec,
3267 },
3268 {
3269 .procname = "gc_min_interval_ms",
3270 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3271 .maxlen = sizeof(int),
3272 .mode = 0644,
3273 .proc_handler = proc_dointvec_ms_jiffies,
3274 },
3275 { }
3276 };
3277
3278 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3279 {
3280 struct ctl_table *table;
3281
3282 table = kmemdup(ipv6_route_table_template,
3283 sizeof(ipv6_route_table_template),
3284 GFP_KERNEL);
3285
3286 if (table) {
3287 table[0].data = &net->ipv6.sysctl.flush_delay;
3288 table[0].extra1 = net;
3289 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3290 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3291 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3292 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3293 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3294 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3295 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3296 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3297 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3298
3299 /* Don't export sysctls to unprivileged users */
3300 if (net->user_ns != &init_user_ns)
3301 table[0].procname = NULL;
3302 }
3303
3304 return table;
3305 }
3306 #endif
3307
3308 static int __net_init ip6_route_net_init(struct net *net)
3309 {
3310 int ret = -ENOMEM;
3311
3312 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3313 sizeof(net->ipv6.ip6_dst_ops));
3314
3315 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3316 goto out_ip6_dst_ops;
3317
3318 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3319 sizeof(*net->ipv6.ip6_null_entry),
3320 GFP_KERNEL);
3321 if (!net->ipv6.ip6_null_entry)
3322 goto out_ip6_dst_entries;
3323 net->ipv6.ip6_null_entry->dst.path =
3324 (struct dst_entry *)net->ipv6.ip6_null_entry;
3325 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3326 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3327 ip6_template_metrics, true);
3328
3329 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3330 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3331 sizeof(*net->ipv6.ip6_prohibit_entry),
3332 GFP_KERNEL);
3333 if (!net->ipv6.ip6_prohibit_entry)
3334 goto out_ip6_null_entry;
3335 net->ipv6.ip6_prohibit_entry->dst.path =
3336 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3337 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3338 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3339 ip6_template_metrics, true);
3340
3341 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3342 sizeof(*net->ipv6.ip6_blk_hole_entry),
3343 GFP_KERNEL);
3344 if (!net->ipv6.ip6_blk_hole_entry)
3345 goto out_ip6_prohibit_entry;
3346 net->ipv6.ip6_blk_hole_entry->dst.path =
3347 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3348 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3349 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3350 ip6_template_metrics, true);
3351 #endif
3352
3353 net->ipv6.sysctl.flush_delay = 0;
3354 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3355 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3356 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3357 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3358 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3359 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3360 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3361
3362 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3363
3364 ret = 0;
3365 out:
3366 return ret;
3367
3368 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3369 out_ip6_prohibit_entry:
3370 kfree(net->ipv6.ip6_prohibit_entry);
3371 out_ip6_null_entry:
3372 kfree(net->ipv6.ip6_null_entry);
3373 #endif
3374 out_ip6_dst_entries:
3375 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3376 out_ip6_dst_ops:
3377 goto out;
3378 }
3379
3380 static void __net_exit ip6_route_net_exit(struct net *net)
3381 {
3382 kfree(net->ipv6.ip6_null_entry);
3383 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3384 kfree(net->ipv6.ip6_prohibit_entry);
3385 kfree(net->ipv6.ip6_blk_hole_entry);
3386 #endif
3387 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3388 }
3389
3390 static int __net_init ip6_route_net_init_late(struct net *net)
3391 {
3392 #ifdef CONFIG_PROC_FS
3393 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3394 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3395 #endif
3396 return 0;
3397 }
3398
3399 static void __net_exit ip6_route_net_exit_late(struct net *net)
3400 {
3401 #ifdef CONFIG_PROC_FS
3402 remove_proc_entry("ipv6_route", net->proc_net);
3403 remove_proc_entry("rt6_stats", net->proc_net);
3404 #endif
3405 }
3406
3407 static struct pernet_operations ip6_route_net_ops = {
3408 .init = ip6_route_net_init,
3409 .exit = ip6_route_net_exit,
3410 };
3411
3412 static int __net_init ipv6_inetpeer_init(struct net *net)
3413 {
3414 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3415
3416 if (!bp)
3417 return -ENOMEM;
3418 inet_peer_base_init(bp);
3419 net->ipv6.peers = bp;
3420 return 0;
3421 }
3422
3423 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3424 {
3425 struct inet_peer_base *bp = net->ipv6.peers;
3426
3427 net->ipv6.peers = NULL;
3428 inetpeer_invalidate_tree(bp);
3429 kfree(bp);
3430 }
3431
3432 static struct pernet_operations ipv6_inetpeer_ops = {
3433 .init = ipv6_inetpeer_init,
3434 .exit = ipv6_inetpeer_exit,
3435 };
3436
3437 static struct pernet_operations ip6_route_net_late_ops = {
3438 .init = ip6_route_net_init_late,
3439 .exit = ip6_route_net_exit_late,
3440 };
3441
3442 static struct notifier_block ip6_route_dev_notifier = {
3443 .notifier_call = ip6_route_dev_notify,
3444 .priority = 0,
3445 };
3446
3447 int __init ip6_route_init(void)
3448 {
3449 int ret;
3450 int cpu;
3451
3452 ret = -ENOMEM;
3453 ip6_dst_ops_template.kmem_cachep =
3454 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3455 SLAB_HWCACHE_ALIGN, NULL);
3456 if (!ip6_dst_ops_template.kmem_cachep)
3457 goto out;
3458
3459 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3460 if (ret)
3461 goto out_kmem_cache;
3462
3463 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3464 if (ret)
3465 goto out_dst_entries;
3466
3467 ret = register_pernet_subsys(&ip6_route_net_ops);
3468 if (ret)
3469 goto out_register_inetpeer;
3470
3471 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3472
3473 /* Registering of the loopback is done before this portion of code,
3474 * the loopback reference in rt6_info will not be taken, do it
3475 * manually for init_net */
3476 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3477 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3478 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3479 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3480 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3481 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3482 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3483 #endif
3484 ret = fib6_init();
3485 if (ret)
3486 goto out_register_subsys;
3487
3488 ret = xfrm6_init();
3489 if (ret)
3490 goto out_fib6_init;
3491
3492 ret = fib6_rules_init();
3493 if (ret)
3494 goto xfrm6_init;
3495
3496 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3497 if (ret)
3498 goto fib6_rules_init;
3499
3500 ret = -ENOBUFS;
3501 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3502 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3503 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3504 goto out_register_late_subsys;
3505
3506 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3507 if (ret)
3508 goto out_register_late_subsys;
3509
3510 for_each_possible_cpu(cpu) {
3511 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3512
3513 INIT_LIST_HEAD(&ul->head);
3514 spin_lock_init(&ul->lock);
3515 }
3516
3517 out:
3518 return ret;
3519
3520 out_register_late_subsys:
3521 unregister_pernet_subsys(&ip6_route_net_late_ops);
3522 fib6_rules_init:
3523 fib6_rules_cleanup();
3524 xfrm6_init:
3525 xfrm6_fini();
3526 out_fib6_init:
3527 fib6_gc_cleanup();
3528 out_register_subsys:
3529 unregister_pernet_subsys(&ip6_route_net_ops);
3530 out_register_inetpeer:
3531 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3532 out_dst_entries:
3533 dst_entries_destroy(&ip6_dst_blackhole_ops);
3534 out_kmem_cache:
3535 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3536 goto out;
3537 }
3538
3539 void ip6_route_cleanup(void)
3540 {
3541 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3542 unregister_pernet_subsys(&ip6_route_net_late_ops);
3543 fib6_rules_cleanup();
3544 xfrm6_fini();
3545 fib6_gc_cleanup();
3546 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3547 unregister_pernet_subsys(&ip6_route_net_ops);
3548 dst_entries_destroy(&ip6_dst_blackhole_ops);
3549 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3550 }
Linux kernel - Deliverables
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