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23#define pr_fmt(fmt) "IPv6: " fmt
24
25#include <linux/capability.h>
26#include <linux/errno.h>
27#include <linux/export.h>
28#include <linux/types.h>
29#include <linux/times.h>
30#include <linux/socket.h>
31#include <linux/sockios.h>
32#include <linux/net.h>
33#include <linux/route.h>
34#include <linux/netdevice.h>
35#include <linux/in6.h>
36#include <linux/mroute6.h>
37#include <linux/init.h>
38#include <linux/if_arp.h>
39#include <linux/proc_fs.h>
40#include <linux/seq_file.h>
41#include <linux/nsproxy.h>
42#include <linux/slab.h>
43#include <linux/jhash.h>
44#include <net/net_namespace.h>
45#include <net/snmp.h>
46#include <net/ipv6.h>
47#include <net/ip6_fib.h>
48#include <net/ip6_route.h>
49#include <net/ndisc.h>
50#include <net/addrconf.h>
51#include <net/tcp.h>
52#include <linux/rtnetlink.h>
53#include <net/dst.h>
54#include <net/dst_metadata.h>
55#include <net/xfrm.h>
56#include <net/netevent.h>
57#include <net/netlink.h>
58#include <net/rtnh.h>
59#include <net/lwtunnel.h>
60#include <net/ip_tunnels.h>
61#include <net/l3mdev.h>
62#include <net/ip.h>
63#include <linux/uaccess.h>
64#include <linux/btf_ids.h>
65
66#ifdef CONFIG_SYSCTL
67#include <linux/sysctl.h>
68#endif
69
70static int ip6_rt_type_to_error(u8 fib6_type);
71
72#define CREATE_TRACE_POINTS
73#include <trace/events/fib6.h>
74EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup);
75#undef CREATE_TRACE_POINTS
76
77enum rt6_nud_state {
78 RT6_NUD_FAIL_HARD = -3,
79 RT6_NUD_FAIL_PROBE = -2,
80 RT6_NUD_FAIL_DO_RR = -1,
81 RT6_NUD_SUCCEED = 1
82};
83
84static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
85static unsigned int ip6_default_advmss(const struct dst_entry *dst);
86static unsigned int ip6_mtu(const struct dst_entry *dst);
87static struct dst_entry *ip6_negative_advice(struct dst_entry *);
88static void ip6_dst_destroy(struct dst_entry *);
89static void ip6_dst_ifdown(struct dst_entry *,
90 struct net_device *dev, int how);
91static int ip6_dst_gc(struct dst_ops *ops);
92
93static int ip6_pkt_discard(struct sk_buff *skb);
94static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
95static int ip6_pkt_prohibit(struct sk_buff *skb);
96static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
97static void ip6_link_failure(struct sk_buff *skb);
98static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
99 struct sk_buff *skb, u32 mtu,
100 bool confirm_neigh);
101static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
102 struct sk_buff *skb);
103static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
104 int strict);
105static size_t rt6_nlmsg_size(struct fib6_info *f6i);
106static int rt6_fill_node(struct net *net, struct sk_buff *skb,
107 struct fib6_info *rt, struct dst_entry *dst,
108 struct in6_addr *dest, struct in6_addr *src,
109 int iif, int type, u32 portid, u32 seq,
110 unsigned int flags);
111static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
112 const struct in6_addr *daddr,
113 const struct in6_addr *saddr);
114
115#ifdef CONFIG_IPV6_ROUTE_INFO
116static struct fib6_info *rt6_add_route_info(struct net *net,
117 const struct in6_addr *prefix, int prefixlen,
118 const struct in6_addr *gwaddr,
119 struct net_device *dev,
120 unsigned int pref);
121static struct fib6_info *rt6_get_route_info(struct net *net,
122 const struct in6_addr *prefix, int prefixlen,
123 const struct in6_addr *gwaddr,
124 struct net_device *dev);
125#endif
126
127struct uncached_list {
128 spinlock_t lock;
129 struct list_head head;
130};
131
132static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
133
134void rt6_uncached_list_add(struct rt6_info *rt)
135{
136 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
137
138 rt->rt6i_uncached_list = ul;
139
140 spin_lock_bh(&ul->lock);
141 list_add_tail(&rt->rt6i_uncached, &ul->head);
142 spin_unlock_bh(&ul->lock);
143}
144
145void rt6_uncached_list_del(struct rt6_info *rt)
146{
147 if (!list_empty(&rt->rt6i_uncached)) {
148 struct uncached_list *ul = rt->rt6i_uncached_list;
149 struct net *net = dev_net(rt->dst.dev);
150
151 spin_lock_bh(&ul->lock);
152 list_del(&rt->rt6i_uncached);
153 atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache);
154 spin_unlock_bh(&ul->lock);
155 }
156}
157
158static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
159{
160 struct net_device *loopback_dev = net->loopback_dev;
161 int cpu;
162
163 if (dev == loopback_dev)
164 return;
165
166 for_each_possible_cpu(cpu) {
167 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
168 struct rt6_info *rt;
169
170 spin_lock_bh(&ul->lock);
171 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
172 struct inet6_dev *rt_idev = rt->rt6i_idev;
173 struct net_device *rt_dev = rt->dst.dev;
174
175 if (rt_idev->dev == dev) {
176 rt->rt6i_idev = in6_dev_get(loopback_dev);
177 in6_dev_put(rt_idev);
178 }
179
180 if (rt_dev == dev) {
181 rt->dst.dev = blackhole_netdev;
182 dev_hold(rt->dst.dev);
183 dev_put(rt_dev);
184 }
185 }
186 spin_unlock_bh(&ul->lock);
187 }
188}
189
190static inline const void *choose_neigh_daddr(const struct in6_addr *p,
191 struct sk_buff *skb,
192 const void *daddr)
193{
194 if (!ipv6_addr_any(p))
195 return (const void *) p;
196 else if (skb)
197 return &ipv6_hdr(skb)->daddr;
198 return daddr;
199}
200
201struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
202 struct net_device *dev,
203 struct sk_buff *skb,
204 const void *daddr)
205{
206 struct neighbour *n;
207
208 daddr = choose_neigh_daddr(gw, skb, daddr);
209 n = __ipv6_neigh_lookup(dev, daddr);
210 if (n)
211 return n;
212
213 n = neigh_create(&nd_tbl, daddr, dev);
214 return IS_ERR(n) ? NULL : n;
215}
216
217static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,
218 struct sk_buff *skb,
219 const void *daddr)
220{
221 const struct rt6_info *rt = container_of(dst, struct rt6_info, dst);
222
223 return ip6_neigh_lookup(rt6_nexthop(rt, &in6addr_any),
224 dst->dev, skb, daddr);
225}
226
227static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
228{
229 struct net_device *dev = dst->dev;
230 struct rt6_info *rt = (struct rt6_info *)dst;
231
232 daddr = choose_neigh_daddr(rt6_nexthop(rt, &in6addr_any), NULL, daddr);
233 if (!daddr)
234 return;
235 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
236 return;
237 if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
238 return;
239 __ipv6_confirm_neigh(dev, daddr);
240}
241
242static struct dst_ops ip6_dst_ops_template = {
243 .family = AF_INET6,
244 .gc = ip6_dst_gc,
245 .gc_thresh = 1024,
246 .check = ip6_dst_check,
247 .default_advmss = ip6_default_advmss,
248 .mtu = ip6_mtu,
249 .cow_metrics = dst_cow_metrics_generic,
250 .destroy = ip6_dst_destroy,
251 .ifdown = ip6_dst_ifdown,
252 .negative_advice = ip6_negative_advice,
253 .link_failure = ip6_link_failure,
254 .update_pmtu = ip6_rt_update_pmtu,
255 .redirect = rt6_do_redirect,
256 .local_out = __ip6_local_out,
257 .neigh_lookup = ip6_dst_neigh_lookup,
258 .confirm_neigh = ip6_confirm_neigh,
259};
260
261static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
262{
263 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
264
265 return mtu ? : dst->dev->mtu;
266}
267
268static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
269 struct sk_buff *skb, u32 mtu,
270 bool confirm_neigh)
271{
272}
273
274static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
275 struct sk_buff *skb)
276{
277}
278
279static struct dst_ops ip6_dst_blackhole_ops = {
280 .family = AF_INET6,
281 .destroy = ip6_dst_destroy,
282 .check = ip6_dst_check,
283 .mtu = ip6_blackhole_mtu,
284 .default_advmss = ip6_default_advmss,
285 .update_pmtu = ip6_rt_blackhole_update_pmtu,
286 .redirect = ip6_rt_blackhole_redirect,
287 .cow_metrics = dst_cow_metrics_generic,
288 .neigh_lookup = ip6_dst_neigh_lookup,
289};
290
291static const u32 ip6_template_metrics[RTAX_MAX] = {
292 [RTAX_HOPLIMIT - 1] = 0,
293};
294
295static const struct fib6_info fib6_null_entry_template = {
296 .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP),
297 .fib6_protocol = RTPROT_KERNEL,
298 .fib6_metric = ~(u32)0,
299 .fib6_ref = REFCOUNT_INIT(1),
300 .fib6_type = RTN_UNREACHABLE,
301 .fib6_metrics = (struct dst_metrics *)&dst_default_metrics,
302};
303
304static const struct rt6_info ip6_null_entry_template = {
305 .dst = {
306 .__refcnt = ATOMIC_INIT(1),
307 .__use = 1,
308 .obsolete = DST_OBSOLETE_FORCE_CHK,
309 .error = -ENETUNREACH,
310 .input = ip6_pkt_discard,
311 .output = ip6_pkt_discard_out,
312 },
313 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
314};
315
316#ifdef CONFIG_IPV6_MULTIPLE_TABLES
317
318static const struct rt6_info ip6_prohibit_entry_template = {
319 .dst = {
320 .__refcnt = ATOMIC_INIT(1),
321 .__use = 1,
322 .obsolete = DST_OBSOLETE_FORCE_CHK,
323 .error = -EACCES,
324 .input = ip6_pkt_prohibit,
325 .output = ip6_pkt_prohibit_out,
326 },
327 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
328};
329
330static const struct rt6_info ip6_blk_hole_entry_template = {
331 .dst = {
332 .__refcnt = ATOMIC_INIT(1),
333 .__use = 1,
334 .obsolete = DST_OBSOLETE_FORCE_CHK,
335 .error = -EINVAL,
336 .input = dst_discard,
337 .output = dst_discard_out,
338 },
339 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
340};
341
342#endif
343
344static void rt6_info_init(struct rt6_info *rt)
345{
346 struct dst_entry *dst = &rt->dst;
347
348 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
349 INIT_LIST_HEAD(&rt->rt6i_uncached);
350}
351
352
353struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
354 int flags)
355{
356 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
357 1, DST_OBSOLETE_FORCE_CHK, flags);
358
359 if (rt) {
360 rt6_info_init(rt);
361 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
362 }
363
364 return rt;
365}
366EXPORT_SYMBOL(ip6_dst_alloc);
367
368static void ip6_dst_destroy(struct dst_entry *dst)
369{
370 struct rt6_info *rt = (struct rt6_info *)dst;
371 struct fib6_info *from;
372 struct inet6_dev *idev;
373
374 ip_dst_metrics_put(dst);
375 rt6_uncached_list_del(rt);
376
377 idev = rt->rt6i_idev;
378 if (idev) {
379 rt->rt6i_idev = NULL;
380 in6_dev_put(idev);
381 }
382
383 from = xchg((__force struct fib6_info **)&rt->from, NULL);
384 fib6_info_release(from);
385}
386
387static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
388 int how)
389{
390 struct rt6_info *rt = (struct rt6_info *)dst;
391 struct inet6_dev *idev = rt->rt6i_idev;
392 struct net_device *loopback_dev =
393 dev_net(dev)->loopback_dev;
394
395 if (idev && idev->dev != loopback_dev) {
396 struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev);
397 if (loopback_idev) {
398 rt->rt6i_idev = loopback_idev;
399 in6_dev_put(idev);
400 }
401 }
402}
403
404static bool __rt6_check_expired(const struct rt6_info *rt)
405{
406 if (rt->rt6i_flags & RTF_EXPIRES)
407 return time_after(jiffies, rt->dst.expires);
408 else
409 return false;
410}
411
412static bool rt6_check_expired(const struct rt6_info *rt)
413{
414 struct fib6_info *from;
415
416 from = rcu_dereference(rt->from);
417
418 if (rt->rt6i_flags & RTF_EXPIRES) {
419 if (time_after(jiffies, rt->dst.expires))
420 return true;
421 } else if (from) {
422 return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK ||
423 fib6_check_expired(from);
424 }
425 return false;
426}
427
428void fib6_select_path(const struct net *net, struct fib6_result *res,
429 struct flowi6 *fl6, int oif, bool have_oif_match,
430 const struct sk_buff *skb, int strict)
431{
432 struct fib6_info *sibling, *next_sibling;
433 struct fib6_info *match = res->f6i;
434
435 if (!match->nh && (!match->fib6_nsiblings || have_oif_match))
436 goto out;
437
438 if (match->nh && have_oif_match && res->nh)
439 return;
440
441
442
443
444 if (!fl6->mp_hash &&
445 (!match->nh || nexthop_is_multipath(match->nh)))
446 fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
447
448 if (unlikely(match->nh)) {
449 nexthop_path_fib6_result(res, fl6->mp_hash);
450 return;
451 }
452
453 if (fl6->mp_hash <= atomic_read(&match->fib6_nh->fib_nh_upper_bound))
454 goto out;
455
456 list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings,
457 fib6_siblings) {
458 const struct fib6_nh *nh = sibling->fib6_nh;
459 int nh_upper_bound;
460
461 nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound);
462 if (fl6->mp_hash > nh_upper_bound)
463 continue;
464 if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0)
465 break;
466 match = sibling;
467 break;
468 }
469
470out:
471 res->f6i = match;
472 res->nh = match->fib6_nh;
473}
474
475
476
477
478
479static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh,
480 const struct in6_addr *saddr, int oif, int flags)
481{
482 const struct net_device *dev;
483
484 if (nh->fib_nh_flags & RTNH_F_DEAD)
485 return false;
486
487 dev = nh->fib_nh_dev;
488 if (oif) {
489 if (dev->ifindex == oif)
490 return true;
491 } else {
492 if (ipv6_chk_addr(net, saddr, dev,
493 flags & RT6_LOOKUP_F_IFACE))
494 return true;
495 }
496
497 return false;
498}
499
500struct fib6_nh_dm_arg {
501 struct net *net;
502 const struct in6_addr *saddr;
503 int oif;
504 int flags;
505 struct fib6_nh *nh;
506};
507
508static int __rt6_nh_dev_match(struct fib6_nh *nh, void *_arg)
509{
510 struct fib6_nh_dm_arg *arg = _arg;
511
512 arg->nh = nh;
513 return __rt6_device_match(arg->net, nh, arg->saddr, arg->oif,
514 arg->flags);
515}
516
517
518static struct fib6_nh *rt6_nh_dev_match(struct net *net, struct nexthop *nh,
519 struct fib6_result *res,
520 const struct in6_addr *saddr,
521 int oif, int flags)
522{
523 struct fib6_nh_dm_arg arg = {
524 .net = net,
525 .saddr = saddr,
526 .oif = oif,
527 .flags = flags,
528 };
529
530 if (nexthop_is_blackhole(nh))
531 return NULL;
532
533 if (nexthop_for_each_fib6_nh(nh, __rt6_nh_dev_match, &arg))
534 return arg.nh;
535
536 return NULL;
537}
538
539static void rt6_device_match(struct net *net, struct fib6_result *res,
540 const struct in6_addr *saddr, int oif, int flags)
541{
542 struct fib6_info *f6i = res->f6i;
543 struct fib6_info *spf6i;
544 struct fib6_nh *nh;
545
546 if (!oif && ipv6_addr_any(saddr)) {
547 if (unlikely(f6i->nh)) {
548 nh = nexthop_fib6_nh(f6i->nh);
549 if (nexthop_is_blackhole(f6i->nh))
550 goto out_blackhole;
551 } else {
552 nh = f6i->fib6_nh;
553 }
554 if (!(nh->fib_nh_flags & RTNH_F_DEAD))
555 goto out;
556 }
557
558 for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) {
559 bool matched = false;
560
561 if (unlikely(spf6i->nh)) {
562 nh = rt6_nh_dev_match(net, spf6i->nh, res, saddr,
563 oif, flags);
564 if (nh)
565 matched = true;
566 } else {
567 nh = spf6i->fib6_nh;
568 if (__rt6_device_match(net, nh, saddr, oif, flags))
569 matched = true;
570 }
571 if (matched) {
572 res->f6i = spf6i;
573 goto out;
574 }
575 }
576
577 if (oif && flags & RT6_LOOKUP_F_IFACE) {
578 res->f6i = net->ipv6.fib6_null_entry;
579 nh = res->f6i->fib6_nh;
580 goto out;
581 }
582
583 if (unlikely(f6i->nh)) {
584 nh = nexthop_fib6_nh(f6i->nh);
585 if (nexthop_is_blackhole(f6i->nh))
586 goto out_blackhole;
587 } else {
588 nh = f6i->fib6_nh;
589 }
590
591 if (nh->fib_nh_flags & RTNH_F_DEAD) {
592 res->f6i = net->ipv6.fib6_null_entry;
593 nh = res->f6i->fib6_nh;
594 }
595out:
596 res->nh = nh;
597 res->fib6_type = res->f6i->fib6_type;
598 res->fib6_flags = res->f6i->fib6_flags;
599 return;
600
601out_blackhole:
602 res->fib6_flags |= RTF_REJECT;
603 res->fib6_type = RTN_BLACKHOLE;
604 res->nh = nh;
605}
606
607#ifdef CONFIG_IPV6_ROUTER_PREF
608struct __rt6_probe_work {
609 struct work_struct work;
610 struct in6_addr target;
611 struct net_device *dev;
612};
613
614static void rt6_probe_deferred(struct work_struct *w)
615{
616 struct in6_addr mcaddr;
617 struct __rt6_probe_work *work =
618 container_of(w, struct __rt6_probe_work, work);
619
620 addrconf_addr_solict_mult(&work->target, &mcaddr);
621 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
622 dev_put(work->dev);
623 kfree(work);
624}
625
626static void rt6_probe(struct fib6_nh *fib6_nh)
627{
628 struct __rt6_probe_work *work = NULL;
629 const struct in6_addr *nh_gw;
630 unsigned long last_probe;
631 struct neighbour *neigh;
632 struct net_device *dev;
633 struct inet6_dev *idev;
634
635
636
637
638
639
640
641
642
643 if (!fib6_nh->fib_nh_gw_family)
644 return;
645
646 nh_gw = &fib6_nh->fib_nh_gw6;
647 dev = fib6_nh->fib_nh_dev;
648 rcu_read_lock_bh();
649 last_probe = READ_ONCE(fib6_nh->last_probe);
650 idev = __in6_dev_get(dev);
651 neigh = __ipv6_neigh_lookup_noref(dev, nh_gw);
652 if (neigh) {
653 if (neigh->nud_state & NUD_VALID)
654 goto out;
655
656 write_lock(&neigh->lock);
657 if (!(neigh->nud_state & NUD_VALID) &&
658 time_after(jiffies,
659 neigh->updated + idev->cnf.rtr_probe_interval)) {
660 work = kmalloc(sizeof(*work), GFP_ATOMIC);
661 if (work)
662 __neigh_set_probe_once(neigh);
663 }
664 write_unlock(&neigh->lock);
665 } else if (time_after(jiffies, last_probe +
666 idev->cnf.rtr_probe_interval)) {
667 work = kmalloc(sizeof(*work), GFP_ATOMIC);
668 }
669
670 if (!work || cmpxchg(&fib6_nh->last_probe,
671 last_probe, jiffies) != last_probe) {
672 kfree(work);
673 } else {
674 INIT_WORK(&work->work, rt6_probe_deferred);
675 work->target = *nh_gw;
676 dev_hold(dev);
677 work->dev = dev;
678 schedule_work(&work->work);
679 }
680
681out:
682 rcu_read_unlock_bh();
683}
684#else
685static inline void rt6_probe(struct fib6_nh *fib6_nh)
686{
687}
688#endif
689
690
691
692
693static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh)
694{
695 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
696 struct neighbour *neigh;
697
698 rcu_read_lock_bh();
699 neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev,
700 &fib6_nh->fib_nh_gw6);
701 if (neigh) {
702 read_lock(&neigh->lock);
703 if (neigh->nud_state & NUD_VALID)
704 ret = RT6_NUD_SUCCEED;
705#ifdef CONFIG_IPV6_ROUTER_PREF
706 else if (!(neigh->nud_state & NUD_FAILED))
707 ret = RT6_NUD_SUCCEED;
708 else
709 ret = RT6_NUD_FAIL_PROBE;
710#endif
711 read_unlock(&neigh->lock);
712 } else {
713 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
714 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
715 }
716 rcu_read_unlock_bh();
717
718 return ret;
719}
720
721static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
722 int strict)
723{
724 int m = 0;
725
726 if (!oif || nh->fib_nh_dev->ifindex == oif)
727 m = 2;
728
729 if (!m && (strict & RT6_LOOKUP_F_IFACE))
730 return RT6_NUD_FAIL_HARD;
731#ifdef CONFIG_IPV6_ROUTER_PREF
732 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2;
733#endif
734 if ((strict & RT6_LOOKUP_F_REACHABLE) &&
735 !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) {
736 int n = rt6_check_neigh(nh);
737 if (n < 0)
738 return n;
739 }
740 return m;
741}
742
743static bool find_match(struct fib6_nh *nh, u32 fib6_flags,
744 int oif, int strict, int *mpri, bool *do_rr)
745{
746 bool match_do_rr = false;
747 bool rc = false;
748 int m;
749
750 if (nh->fib_nh_flags & RTNH_F_DEAD)
751 goto out;
752
753 if (ip6_ignore_linkdown(nh->fib_nh_dev) &&
754 nh->fib_nh_flags & RTNH_F_LINKDOWN &&
755 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
756 goto out;
757
758 m = rt6_score_route(nh, fib6_flags, oif, strict);
759 if (m == RT6_NUD_FAIL_DO_RR) {
760 match_do_rr = true;
761 m = 0;
762 } else if (m == RT6_NUD_FAIL_HARD) {
763 goto out;
764 }
765
766 if (strict & RT6_LOOKUP_F_REACHABLE)
767 rt6_probe(nh);
768
769
770 if (m > *mpri) {
771 *do_rr = match_do_rr;
772 *mpri = m;
773 rc = true;
774 }
775out:
776 return rc;
777}
778
779struct fib6_nh_frl_arg {
780 u32 flags;
781 int oif;
782 int strict;
783 int *mpri;
784 bool *do_rr;
785 struct fib6_nh *nh;
786};
787
788static int rt6_nh_find_match(struct fib6_nh *nh, void *_arg)
789{
790 struct fib6_nh_frl_arg *arg = _arg;
791
792 arg->nh = nh;
793 return find_match(nh, arg->flags, arg->oif, arg->strict,
794 arg->mpri, arg->do_rr);
795}
796
797static void __find_rr_leaf(struct fib6_info *f6i_start,
798 struct fib6_info *nomatch, u32 metric,
799 struct fib6_result *res, struct fib6_info **cont,
800 int oif, int strict, bool *do_rr, int *mpri)
801{
802 struct fib6_info *f6i;
803
804 for (f6i = f6i_start;
805 f6i && f6i != nomatch;
806 f6i = rcu_dereference(f6i->fib6_next)) {
807 bool matched = false;
808 struct fib6_nh *nh;
809
810 if (cont && f6i->fib6_metric != metric) {
811 *cont = f6i;
812 return;
813 }
814
815 if (fib6_check_expired(f6i))
816 continue;
817
818 if (unlikely(f6i->nh)) {
819 struct fib6_nh_frl_arg arg = {
820 .flags = f6i->fib6_flags,
821 .oif = oif,
822 .strict = strict,
823 .mpri = mpri,
824 .do_rr = do_rr
825 };
826
827 if (nexthop_is_blackhole(f6i->nh)) {
828 res->fib6_flags = RTF_REJECT;
829 res->fib6_type = RTN_BLACKHOLE;
830 res->f6i = f6i;
831 res->nh = nexthop_fib6_nh(f6i->nh);
832 return;
833 }
834 if (nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_find_match,
835 &arg)) {
836 matched = true;
837 nh = arg.nh;
838 }
839 } else {
840 nh = f6i->fib6_nh;
841 if (find_match(nh, f6i->fib6_flags, oif, strict,
842 mpri, do_rr))
843 matched = true;
844 }
845 if (matched) {
846 res->f6i = f6i;
847 res->nh = nh;
848 res->fib6_flags = f6i->fib6_flags;
849 res->fib6_type = f6i->fib6_type;
850 }
851 }
852}
853
854static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf,
855 struct fib6_info *rr_head, int oif, int strict,
856 bool *do_rr, struct fib6_result *res)
857{
858 u32 metric = rr_head->fib6_metric;
859 struct fib6_info *cont = NULL;
860 int mpri = -1;
861
862 __find_rr_leaf(rr_head, NULL, metric, res, &cont,
863 oif, strict, do_rr, &mpri);
864
865 __find_rr_leaf(leaf, rr_head, metric, res, &cont,
866 oif, strict, do_rr, &mpri);
867
868 if (res->f6i || !cont)
869 return;
870
871 __find_rr_leaf(cont, NULL, metric, res, NULL,
872 oif, strict, do_rr, &mpri);
873}
874
875static void rt6_select(struct net *net, struct fib6_node *fn, int oif,
876 struct fib6_result *res, int strict)
877{
878 struct fib6_info *leaf = rcu_dereference(fn->leaf);
879 struct fib6_info *rt0;
880 bool do_rr = false;
881 int key_plen;
882
883
884 res->f6i = NULL;
885
886 if (!leaf || leaf == net->ipv6.fib6_null_entry)
887 goto out;
888
889 rt0 = rcu_dereference(fn->rr_ptr);
890 if (!rt0)
891 rt0 = leaf;
892
893
894
895
896
897
898 key_plen = rt0->fib6_dst.plen;
899#ifdef CONFIG_IPV6_SUBTREES
900 if (rt0->fib6_src.plen)
901 key_plen = rt0->fib6_src.plen;
902#endif
903 if (fn->fn_bit != key_plen)
904 goto out;
905
906 find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res);
907 if (do_rr) {
908 struct fib6_info *next = rcu_dereference(rt0->fib6_next);
909
910
911 if (!next || next->fib6_metric != rt0->fib6_metric)
912 next = leaf;
913
914 if (next != rt0) {
915 spin_lock_bh(&leaf->fib6_table->tb6_lock);
916
917 if (next->fib6_node)
918 rcu_assign_pointer(fn->rr_ptr, next);
919 spin_unlock_bh(&leaf->fib6_table->tb6_lock);
920 }
921 }
922
923out:
924 if (!res->f6i) {
925 res->f6i = net->ipv6.fib6_null_entry;
926 res->nh = res->f6i->fib6_nh;
927 res->fib6_flags = res->f6i->fib6_flags;
928 res->fib6_type = res->f6i->fib6_type;
929 }
930}
931
932static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res)
933{
934 return (res->f6i->fib6_flags & RTF_NONEXTHOP) ||
935 res->nh->fib_nh_gw_family;
936}
937
938#ifdef CONFIG_IPV6_ROUTE_INFO
939int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
940 const struct in6_addr *gwaddr)
941{
942 struct net *net = dev_net(dev);
943 struct route_info *rinfo = (struct route_info *) opt;
944 struct in6_addr prefix_buf, *prefix;
945 unsigned int pref;
946 unsigned long lifetime;
947 struct fib6_info *rt;
948
949 if (len < sizeof(struct route_info)) {
950 return -EINVAL;
951 }
952
953
954 if (rinfo->length > 3) {
955 return -EINVAL;
956 } else if (rinfo->prefix_len > 128) {
957 return -EINVAL;
958 } else if (rinfo->prefix_len > 64) {
959 if (rinfo->length < 2) {
960 return -EINVAL;
961 }
962 } else if (rinfo->prefix_len > 0) {
963 if (rinfo->length < 1) {
964 return -EINVAL;
965 }
966 }
967
968 pref = rinfo->route_pref;
969 if (pref == ICMPV6_ROUTER_PREF_INVALID)
970 return -EINVAL;
971
972 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
973
974 if (rinfo->length == 3)
975 prefix = (struct in6_addr *)rinfo->prefix;
976 else {
977
978 ipv6_addr_prefix(&prefix_buf,
979 (struct in6_addr *)rinfo->prefix,
980 rinfo->prefix_len);
981 prefix = &prefix_buf;
982 }
983
984 if (rinfo->prefix_len == 0)
985 rt = rt6_get_dflt_router(net, gwaddr, dev);
986 else
987 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
988 gwaddr, dev);
989
990 if (rt && !lifetime) {
991 ip6_del_rt(net, rt, false);
992 rt = NULL;
993 }
994
995 if (!rt && lifetime)
996 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
997 dev, pref);
998 else if (rt)
999 rt->fib6_flags = RTF_ROUTEINFO |
1000 (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
1001
1002 if (rt) {
1003 if (!addrconf_finite_timeout(lifetime))
1004 fib6_clean_expires(rt);
1005 else
1006 fib6_set_expires(rt, jiffies + HZ * lifetime);
1007
1008 fib6_info_release(rt);
1009 }
1010 return 0;
1011}
1012#endif
1013
1014
1015
1016
1017
1018
1019static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res)
1020{
1021 struct net_device *dev = res->nh->fib_nh_dev;
1022
1023 if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) {
1024
1025
1026
1027
1028 if (netif_is_l3_slave(dev) &&
1029 !rt6_need_strict(&res->f6i->fib6_dst.addr))
1030 dev = l3mdev_master_dev_rcu(dev);
1031 else if (!netif_is_l3_master(dev))
1032 dev = dev_net(dev)->loopback_dev;
1033
1034
1035
1036 }
1037
1038 return dev;
1039}
1040
1041static const int fib6_prop[RTN_MAX + 1] = {
1042 [RTN_UNSPEC] = 0,
1043 [RTN_UNICAST] = 0,
1044 [RTN_LOCAL] = 0,
1045 [RTN_BROADCAST] = 0,
1046 [RTN_ANYCAST] = 0,
1047 [RTN_MULTICAST] = 0,
1048 [RTN_BLACKHOLE] = -EINVAL,
1049 [RTN_UNREACHABLE] = -EHOSTUNREACH,
1050 [RTN_PROHIBIT] = -EACCES,
1051 [RTN_THROW] = -EAGAIN,
1052 [RTN_NAT] = -EINVAL,
1053 [RTN_XRESOLVE] = -EINVAL,
1054};
1055
1056static int ip6_rt_type_to_error(u8 fib6_type)
1057{
1058 return fib6_prop[fib6_type];
1059}
1060
1061static unsigned short fib6_info_dst_flags(struct fib6_info *rt)
1062{
1063 unsigned short flags = 0;
1064
1065 if (rt->dst_nocount)
1066 flags |= DST_NOCOUNT;
1067 if (rt->dst_nopolicy)
1068 flags |= DST_NOPOLICY;
1069
1070 return flags;
1071}
1072
1073static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type)
1074{
1075 rt->dst.error = ip6_rt_type_to_error(fib6_type);
1076
1077 switch (fib6_type) {
1078 case RTN_BLACKHOLE:
1079 rt->dst.output = dst_discard_out;
1080 rt->dst.input = dst_discard;
1081 break;
1082 case RTN_PROHIBIT:
1083 rt->dst.output = ip6_pkt_prohibit_out;
1084 rt->dst.input = ip6_pkt_prohibit;
1085 break;
1086 case RTN_THROW:
1087 case RTN_UNREACHABLE:
1088 default:
1089 rt->dst.output = ip6_pkt_discard_out;
1090 rt->dst.input = ip6_pkt_discard;
1091 break;
1092 }
1093}
1094
1095static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res)
1096{
1097 struct fib6_info *f6i = res->f6i;
1098
1099 if (res->fib6_flags & RTF_REJECT) {
1100 ip6_rt_init_dst_reject(rt, res->fib6_type);
1101 return;
1102 }
1103
1104 rt->dst.error = 0;
1105 rt->dst.output = ip6_output;
1106
1107 if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) {
1108 rt->dst.input = ip6_input;
1109 } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) {
1110 rt->dst.input = ip6_mc_input;
1111 } else {
1112 rt->dst.input = ip6_forward;
1113 }
1114
1115 if (res->nh->fib_nh_lws) {
1116 rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws);
1117 lwtunnel_set_redirect(&rt->dst);
1118 }
1119
1120 rt->dst.lastuse = jiffies;
1121}
1122
1123
1124static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from)
1125{
1126 rt->rt6i_flags &= ~RTF_EXPIRES;
1127 rcu_assign_pointer(rt->from, from);
1128 ip_dst_init_metrics(&rt->dst, from->fib6_metrics);
1129}
1130
1131
1132static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res)
1133{
1134 const struct fib6_nh *nh = res->nh;
1135 const struct net_device *dev = nh->fib_nh_dev;
1136 struct fib6_info *f6i = res->f6i;
1137
1138 ip6_rt_init_dst(rt, res);
1139
1140 rt->rt6i_dst = f6i->fib6_dst;
1141 rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
1142 rt->rt6i_flags = res->fib6_flags;
1143 if (nh->fib_nh_gw_family) {
1144 rt->rt6i_gateway = nh->fib_nh_gw6;
1145 rt->rt6i_flags |= RTF_GATEWAY;
1146 }
1147 rt6_set_from(rt, f6i);
1148#ifdef CONFIG_IPV6_SUBTREES
1149 rt->rt6i_src = f6i->fib6_src;
1150#endif
1151}
1152
1153static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
1154 struct in6_addr *saddr)
1155{
1156 struct fib6_node *pn, *sn;
1157 while (1) {
1158 if (fn->fn_flags & RTN_TL_ROOT)
1159 return NULL;
1160 pn = rcu_dereference(fn->parent);
1161 sn = FIB6_SUBTREE(pn);
1162 if (sn && sn != fn)
1163 fn = fib6_node_lookup(sn, NULL, saddr);
1164 else
1165 fn = pn;
1166 if (fn->fn_flags & RTN_RTINFO)
1167 return fn;
1168 }
1169}
1170
1171static bool ip6_hold_safe(struct net *net, struct rt6_info **prt)
1172{
1173 struct rt6_info *rt = *prt;
1174
1175 if (dst_hold_safe(&rt->dst))
1176 return true;
1177 if (net) {
1178 rt = net->ipv6.ip6_null_entry;
1179 dst_hold(&rt->dst);
1180 } else {
1181 rt = NULL;
1182 }
1183 *prt = rt;
1184 return false;
1185}
1186
1187
1188static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res)
1189{
1190 struct net_device *dev = res->nh->fib_nh_dev;
1191 struct fib6_info *f6i = res->f6i;
1192 unsigned short flags;
1193 struct rt6_info *nrt;
1194
1195 if (!fib6_info_hold_safe(f6i))
1196 goto fallback;
1197
1198 flags = fib6_info_dst_flags(f6i);
1199 nrt = ip6_dst_alloc(dev_net(dev), dev, flags);
1200 if (!nrt) {
1201 fib6_info_release(f6i);
1202 goto fallback;
1203 }
1204
1205 ip6_rt_copy_init(nrt, res);
1206 return nrt;
1207
1208fallback:
1209 nrt = dev_net(dev)->ipv6.ip6_null_entry;
1210 dst_hold(&nrt->dst);
1211 return nrt;
1212}
1213
1214INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_lookup(struct net *net,
1215 struct fib6_table *table,
1216 struct flowi6 *fl6,
1217 const struct sk_buff *skb,
1218 int flags)
1219{
1220 struct fib6_result res = {};
1221 struct fib6_node *fn;
1222 struct rt6_info *rt;
1223
1224 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1225 flags &= ~RT6_LOOKUP_F_IFACE;
1226
1227 rcu_read_lock();
1228 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1229restart:
1230 res.f6i = rcu_dereference(fn->leaf);
1231 if (!res.f6i)
1232 res.f6i = net->ipv6.fib6_null_entry;
1233 else
1234 rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif,
1235 flags);
1236
1237 if (res.f6i == net->ipv6.fib6_null_entry) {
1238 fn = fib6_backtrack(fn, &fl6->saddr);
1239 if (fn)
1240 goto restart;
1241
1242 rt = net->ipv6.ip6_null_entry;
1243 dst_hold(&rt->dst);
1244 goto out;
1245 } else if (res.fib6_flags & RTF_REJECT) {
1246 goto do_create;
1247 }
1248
1249 fib6_select_path(net, &res, fl6, fl6->flowi6_oif,
1250 fl6->flowi6_oif != 0, skb, flags);
1251
1252
1253 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
1254 if (rt) {
1255 if (ip6_hold_safe(net, &rt))
1256 dst_use_noref(&rt->dst, jiffies);
1257 } else {
1258do_create:
1259 rt = ip6_create_rt_rcu(&res);
1260 }
1261
1262out:
1263 trace_fib6_table_lookup(net, &res, table, fl6);
1264
1265 rcu_read_unlock();
1266
1267 return rt;
1268}
1269
1270struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
1271 const struct sk_buff *skb, int flags)
1272{
1273 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup);
1274}
1275EXPORT_SYMBOL_GPL(ip6_route_lookup);
1276
1277struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
1278 const struct in6_addr *saddr, int oif,
1279 const struct sk_buff *skb, int strict)
1280{
1281 struct flowi6 fl6 = {
1282 .flowi6_oif = oif,
1283 .daddr = *daddr,
1284 };
1285 struct dst_entry *dst;
1286 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
1287
1288 if (saddr) {
1289 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
1290 flags |= RT6_LOOKUP_F_HAS_SADDR;
1291 }
1292
1293 dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup);
1294 if (dst->error == 0)
1295 return (struct rt6_info *) dst;
1296
1297 dst_release(dst);
1298
1299 return NULL;
1300}
1301EXPORT_SYMBOL(rt6_lookup);
1302
1303
1304
1305
1306
1307
1308
1309static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info,
1310 struct netlink_ext_ack *extack)
1311{
1312 int err;
1313 struct fib6_table *table;
1314
1315 table = rt->fib6_table;
1316 spin_lock_bh(&table->tb6_lock);
1317 err = fib6_add(&table->tb6_root, rt, info, extack);
1318 spin_unlock_bh(&table->tb6_lock);
1319
1320 return err;
1321}
1322
1323int ip6_ins_rt(struct net *net, struct fib6_info *rt)
1324{
1325 struct nl_info info = { .nl_net = net, };
1326
1327 return __ip6_ins_rt(rt, &info, NULL);
1328}
1329
1330static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res,
1331 const struct in6_addr *daddr,
1332 const struct in6_addr *saddr)
1333{
1334 struct fib6_info *f6i = res->f6i;
1335 struct net_device *dev;
1336 struct rt6_info *rt;
1337
1338
1339
1340
1341
1342 if (!fib6_info_hold_safe(f6i))
1343 return NULL;
1344
1345 dev = ip6_rt_get_dev_rcu(res);
1346 rt = ip6_dst_alloc(dev_net(dev), dev, 0);
1347 if (!rt) {
1348 fib6_info_release(f6i);
1349 return NULL;
1350 }
1351
1352 ip6_rt_copy_init(rt, res);
1353 rt->rt6i_flags |= RTF_CACHE;
1354 rt->rt6i_dst.addr = *daddr;
1355 rt->rt6i_dst.plen = 128;
1356
1357 if (!rt6_is_gw_or_nonexthop(res)) {
1358 if (f6i->fib6_dst.plen != 128 &&
1359 ipv6_addr_equal(&f6i->fib6_dst.addr, daddr))
1360 rt->rt6i_flags |= RTF_ANYCAST;
1361#ifdef CONFIG_IPV6_SUBTREES
1362 if (rt->rt6i_src.plen && saddr) {
1363 rt->rt6i_src.addr = *saddr;
1364 rt->rt6i_src.plen = 128;
1365 }
1366#endif
1367 }
1368
1369 return rt;
1370}
1371
1372static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res)
1373{
1374 struct fib6_info *f6i = res->f6i;
1375 unsigned short flags = fib6_info_dst_flags(f6i);
1376 struct net_device *dev;
1377 struct rt6_info *pcpu_rt;
1378
1379 if (!fib6_info_hold_safe(f6i))
1380 return NULL;
1381
1382 rcu_read_lock();
1383 dev = ip6_rt_get_dev_rcu(res);
1384 pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags | DST_NOCOUNT);
1385 rcu_read_unlock();
1386 if (!pcpu_rt) {
1387 fib6_info_release(f6i);
1388 return NULL;
1389 }
1390 ip6_rt_copy_init(pcpu_rt, res);
1391 pcpu_rt->rt6i_flags |= RTF_PCPU;
1392
1393 if (f6i->nh)
1394 pcpu_rt->sernum = rt_genid_ipv6(dev_net(dev));
1395
1396 return pcpu_rt;
1397}
1398
1399static bool rt6_is_valid(const struct rt6_info *rt6)
1400{
1401 return rt6->sernum == rt_genid_ipv6(dev_net(rt6->dst.dev));
1402}
1403
1404
1405static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res)
1406{
1407 struct rt6_info *pcpu_rt;
1408
1409 pcpu_rt = this_cpu_read(*res->nh->rt6i_pcpu);
1410
1411 if (pcpu_rt && pcpu_rt->sernum && !rt6_is_valid(pcpu_rt)) {
1412 struct rt6_info *prev, **p;
1413
1414 p = this_cpu_ptr(res->nh->rt6i_pcpu);
1415 prev = xchg(p, NULL);
1416 if (prev) {
1417 dst_dev_put(&prev->dst);
1418 dst_release(&prev->dst);
1419 }
1420
1421 pcpu_rt = NULL;
1422 }
1423
1424 return pcpu_rt;
1425}
1426
1427static struct rt6_info *rt6_make_pcpu_route(struct net *net,
1428 const struct fib6_result *res)
1429{
1430 struct rt6_info *pcpu_rt, *prev, **p;
1431
1432 pcpu_rt = ip6_rt_pcpu_alloc(res);
1433 if (!pcpu_rt)
1434 return NULL;
1435
1436 p = this_cpu_ptr(res->nh->rt6i_pcpu);
1437 prev = cmpxchg(p, NULL, pcpu_rt);
1438 BUG_ON(prev);
1439
1440 if (res->f6i->fib6_destroying) {
1441 struct fib6_info *from;
1442
1443 from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL);
1444 fib6_info_release(from);
1445 }
1446
1447 return pcpu_rt;
1448}
1449
1450
1451
1452static DEFINE_SPINLOCK(rt6_exception_lock);
1453
1454
1455
1456
1457static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
1458 struct rt6_exception *rt6_ex)
1459{
1460 struct fib6_info *from;
1461 struct net *net;
1462
1463 if (!bucket || !rt6_ex)
1464 return;
1465
1466 net = dev_net(rt6_ex->rt6i->dst.dev);
1467 net->ipv6.rt6_stats->fib_rt_cache--;
1468
1469
1470
1471
1472 from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL);
1473 fib6_info_release(from);
1474 dst_dev_put(&rt6_ex->rt6i->dst);
1475
1476 hlist_del_rcu(&rt6_ex->hlist);
1477 dst_release(&rt6_ex->rt6i->dst);
1478 kfree_rcu(rt6_ex, rcu);
1479 WARN_ON_ONCE(!bucket->depth);
1480 bucket->depth--;
1481}
1482
1483
1484
1485
1486static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket)
1487{
1488 struct rt6_exception *rt6_ex, *oldest = NULL;
1489
1490 if (!bucket)
1491 return;
1492
1493 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
1494 if (!oldest || time_before(rt6_ex->stamp, oldest->stamp))
1495 oldest = rt6_ex;
1496 }
1497 rt6_remove_exception(bucket, oldest);
1498}
1499
1500static u32 rt6_exception_hash(const struct in6_addr *dst,
1501 const struct in6_addr *src)
1502{
1503 static u32 seed __read_mostly;
1504 u32 val;
1505
1506 net_get_random_once(&seed, sizeof(seed));
1507 val = jhash2((const u32 *)dst, sizeof(*dst)/sizeof(u32), seed);
1508
1509#ifdef CONFIG_IPV6_SUBTREES
1510 if (src)
1511 val = jhash2((const u32 *)src, sizeof(*src)/sizeof(u32), val);
1512#endif
1513 return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
1514}
1515
1516
1517
1518
1519
1520
1521static struct rt6_exception *
1522__rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket,
1523 const struct in6_addr *daddr,
1524 const struct in6_addr *saddr)
1525{
1526 struct rt6_exception *rt6_ex;
1527 u32 hval;
1528
1529 if (!(*bucket) || !daddr)
1530 return NULL;
1531
1532 hval = rt6_exception_hash(daddr, saddr);
1533 *bucket += hval;
1534
1535 hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) {
1536 struct rt6_info *rt6 = rt6_ex->rt6i;
1537 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1538
1539#ifdef CONFIG_IPV6_SUBTREES
1540 if (matched && saddr)
1541 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1542#endif
1543 if (matched)
1544 return rt6_ex;
1545 }
1546 return NULL;
1547}
1548
1549
1550
1551
1552
1553
1554static struct rt6_exception *
1555__rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
1556 const struct in6_addr *daddr,
1557 const struct in6_addr *saddr)
1558{
1559 struct rt6_exception *rt6_ex;
1560 u32 hval;
1561
1562 WARN_ON_ONCE(!rcu_read_lock_held());
1563
1564 if (!(*bucket) || !daddr)
1565 return NULL;
1566
1567 hval = rt6_exception_hash(daddr, saddr);
1568 *bucket += hval;
1569
1570 hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) {
1571 struct rt6_info *rt6 = rt6_ex->rt6i;
1572 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1573
1574#ifdef CONFIG_IPV6_SUBTREES
1575 if (matched && saddr)
1576 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1577#endif
1578 if (matched)
1579 return rt6_ex;
1580 }
1581 return NULL;
1582}
1583
1584static unsigned int fib6_mtu(const struct fib6_result *res)
1585{
1586 const struct fib6_nh *nh = res->nh;
1587 unsigned int mtu;
1588
1589 if (res->f6i->fib6_pmtu) {
1590 mtu = res->f6i->fib6_pmtu;
1591 } else {
1592 struct net_device *dev = nh->fib_nh_dev;
1593 struct inet6_dev *idev;
1594
1595 rcu_read_lock();
1596 idev = __in6_dev_get(dev);
1597 mtu = idev->cnf.mtu6;
1598 rcu_read_unlock();
1599 }
1600
1601 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1602
1603 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
1604}
1605
1606#define FIB6_EXCEPTION_BUCKET_FLUSHED 0x1UL
1607
1608
1609
1610
1611
1612
1613static
1614struct rt6_exception_bucket *fib6_nh_get_excptn_bucket(const struct fib6_nh *nh,
1615 spinlock_t *lock)
1616{
1617 struct rt6_exception_bucket *bucket;
1618
1619 if (lock)
1620 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1621 lockdep_is_held(lock));
1622 else
1623 bucket = rcu_dereference(nh->rt6i_exception_bucket);
1624
1625
1626 if (bucket) {
1627 unsigned long p = (unsigned long)bucket;
1628
1629 p &= ~FIB6_EXCEPTION_BUCKET_FLUSHED;
1630 bucket = (struct rt6_exception_bucket *)p;
1631 }
1632
1633 return bucket;
1634}
1635
1636static bool fib6_nh_excptn_bucket_flushed(struct rt6_exception_bucket *bucket)
1637{
1638 unsigned long p = (unsigned long)bucket;
1639
1640 return !!(p & FIB6_EXCEPTION_BUCKET_FLUSHED);
1641}
1642
1643
1644static void fib6_nh_excptn_bucket_set_flushed(struct fib6_nh *nh,
1645 spinlock_t *lock)
1646{
1647 struct rt6_exception_bucket *bucket;
1648 unsigned long p;
1649
1650 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1651 lockdep_is_held(lock));
1652
1653 p = (unsigned long)bucket;
1654 p |= FIB6_EXCEPTION_BUCKET_FLUSHED;
1655 bucket = (struct rt6_exception_bucket *)p;
1656 rcu_assign_pointer(nh->rt6i_exception_bucket, bucket);
1657}
1658
1659static int rt6_insert_exception(struct rt6_info *nrt,
1660 const struct fib6_result *res)
1661{
1662 struct net *net = dev_net(nrt->dst.dev);
1663 struct rt6_exception_bucket *bucket;
1664 struct fib6_info *f6i = res->f6i;
1665 struct in6_addr *src_key = NULL;
1666 struct rt6_exception *rt6_ex;
1667 struct fib6_nh *nh = res->nh;
1668 int err = 0;
1669
1670 spin_lock_bh(&rt6_exception_lock);
1671
1672 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1673 lockdep_is_held(&rt6_exception_lock));
1674 if (!bucket) {
1675 bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket),
1676 GFP_ATOMIC);
1677 if (!bucket) {
1678 err = -ENOMEM;
1679 goto out;
1680 }
1681 rcu_assign_pointer(nh->rt6i_exception_bucket, bucket);
1682 } else if (fib6_nh_excptn_bucket_flushed(bucket)) {
1683 err = -EINVAL;
1684 goto out;
1685 }
1686
1687#ifdef CONFIG_IPV6_SUBTREES
1688
1689
1690
1691
1692
1693
1694 if (f6i->fib6_src.plen)
1695 src_key = &nrt->rt6i_src.addr;
1696#endif
1697
1698
1699
1700
1701 if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) {
1702 err = -EINVAL;
1703 goto out;
1704 }
1705
1706 rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr,
1707 src_key);
1708 if (rt6_ex)
1709 rt6_remove_exception(bucket, rt6_ex);
1710
1711 rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC);
1712 if (!rt6_ex) {
1713 err = -ENOMEM;
1714 goto out;
1715 }
1716 rt6_ex->rt6i = nrt;
1717 rt6_ex->stamp = jiffies;
1718 hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain);
1719 bucket->depth++;
1720 net->ipv6.rt6_stats->fib_rt_cache++;
1721
1722 if (bucket->depth > FIB6_MAX_DEPTH)
1723 rt6_exception_remove_oldest(bucket);
1724
1725out:
1726 spin_unlock_bh(&rt6_exception_lock);
1727
1728
1729 if (!err) {
1730 spin_lock_bh(&f6i->fib6_table->tb6_lock);
1731 fib6_update_sernum(net, f6i);
1732 spin_unlock_bh(&f6i->fib6_table->tb6_lock);
1733 fib6_force_start_gc(net);
1734 }
1735
1736 return err;
1737}
1738
1739static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from)
1740{
1741 struct rt6_exception_bucket *bucket;
1742 struct rt6_exception *rt6_ex;
1743 struct hlist_node *tmp;
1744 int i;
1745
1746 spin_lock_bh(&rt6_exception_lock);
1747
1748 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
1749 if (!bucket)
1750 goto out;
1751
1752
1753 if (!from)
1754 fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock);
1755
1756 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1757 hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) {
1758 if (!from ||
1759 rcu_access_pointer(rt6_ex->rt6i->from) == from)
1760 rt6_remove_exception(bucket, rt6_ex);
1761 }
1762 WARN_ON_ONCE(!from && bucket->depth);
1763 bucket++;
1764 }
1765out:
1766 spin_unlock_bh(&rt6_exception_lock);
1767}
1768
1769static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg)
1770{
1771 struct fib6_info *f6i = arg;
1772
1773 fib6_nh_flush_exceptions(nh, f6i);
1774
1775 return 0;
1776}
1777
1778void rt6_flush_exceptions(struct fib6_info *f6i)
1779{
1780 if (f6i->nh)
1781 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions,
1782 f6i);
1783 else
1784 fib6_nh_flush_exceptions(f6i->fib6_nh, f6i);
1785}
1786
1787
1788
1789
1790static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
1791 const struct in6_addr *daddr,
1792 const struct in6_addr *saddr)
1793{
1794 const struct in6_addr *src_key = NULL;
1795 struct rt6_exception_bucket *bucket;
1796 struct rt6_exception *rt6_ex;
1797 struct rt6_info *ret = NULL;
1798
1799#ifdef CONFIG_IPV6_SUBTREES
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811 if (res->f6i->fib6_src.plen)
1812 src_key = saddr;
1813find_ex:
1814#endif
1815 bucket = fib6_nh_get_excptn_bucket(res->nh, NULL);
1816 rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
1817
1818 if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
1819 ret = rt6_ex->rt6i;
1820
1821#ifdef CONFIG_IPV6_SUBTREES
1822
1823 if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) {
1824 src_key = &res->f6i->fib6_src.addr;
1825 goto find_ex;
1826 }
1827#endif
1828
1829 return ret;
1830}
1831
1832
1833static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen,
1834 const struct rt6_info *rt)
1835{
1836 const struct in6_addr *src_key = NULL;
1837 struct rt6_exception_bucket *bucket;
1838 struct rt6_exception *rt6_ex;
1839 int err;
1840
1841 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
1842 return -ENOENT;
1843
1844 spin_lock_bh(&rt6_exception_lock);
1845 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
1846
1847#ifdef CONFIG_IPV6_SUBTREES
1848
1849
1850
1851
1852
1853
1854 if (plen)
1855 src_key = &rt->rt6i_src.addr;
1856#endif
1857 rt6_ex = __rt6_find_exception_spinlock(&bucket,
1858 &rt->rt6i_dst.addr,
1859 src_key);
1860 if (rt6_ex) {
1861 rt6_remove_exception(bucket, rt6_ex);
1862 err = 0;
1863 } else {
1864 err = -ENOENT;
1865 }
1866
1867 spin_unlock_bh(&rt6_exception_lock);
1868 return err;
1869}
1870
1871struct fib6_nh_excptn_arg {
1872 struct rt6_info *rt;
1873 int plen;
1874};
1875
1876static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg)
1877{
1878 struct fib6_nh_excptn_arg *arg = _arg;
1879 int err;
1880
1881 err = fib6_nh_remove_exception(nh, arg->plen, arg->rt);
1882 if (err == 0)
1883 return 1;
1884
1885 return 0;
1886}
1887
1888static int rt6_remove_exception_rt(struct rt6_info *rt)
1889{
1890 struct fib6_info *from;
1891
1892 from = rcu_dereference(rt->from);
1893 if (!from || !(rt->rt6i_flags & RTF_CACHE))
1894 return -EINVAL;
1895
1896 if (from->nh) {
1897 struct fib6_nh_excptn_arg arg = {
1898 .rt = rt,
1899 .plen = from->fib6_src.plen
1900 };
1901 int rc;
1902
1903
1904 rc = nexthop_for_each_fib6_nh(from->nh,
1905 rt6_nh_remove_exception_rt,
1906 &arg);
1907 return rc ? 0 : -ENOENT;
1908 }
1909
1910 return fib6_nh_remove_exception(from->fib6_nh,
1911 from->fib6_src.plen, rt);
1912}
1913
1914
1915
1916
1917static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen,
1918 const struct rt6_info *rt)
1919{
1920 const struct in6_addr *src_key = NULL;
1921 struct rt6_exception_bucket *bucket;
1922 struct rt6_exception *rt6_ex;
1923
1924 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
1925#ifdef CONFIG_IPV6_SUBTREES
1926
1927
1928
1929
1930
1931
1932 if (plen)
1933 src_key = &rt->rt6i_src.addr;
1934#endif
1935 rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key);
1936 if (rt6_ex)
1937 rt6_ex->stamp = jiffies;
1938}
1939
1940struct fib6_nh_match_arg {
1941 const struct net_device *dev;
1942 const struct in6_addr *gw;
1943 struct fib6_nh *match;
1944};
1945
1946
1947static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg)
1948{
1949 struct fib6_nh_match_arg *arg = _arg;
1950
1951 if (arg->dev != nh->fib_nh_dev ||
1952 (arg->gw && !nh->fib_nh_gw_family) ||
1953 (!arg->gw && nh->fib_nh_gw_family) ||
1954 (arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6)))
1955 return 0;
1956
1957 arg->match = nh;
1958
1959
1960 return 1;
1961}
1962
1963static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
1964{
1965 struct fib6_info *from;
1966 struct fib6_nh *fib6_nh;
1967
1968 rcu_read_lock();
1969
1970 from = rcu_dereference(rt->from);
1971 if (!from || !(rt->rt6i_flags & RTF_CACHE))
1972 goto unlock;
1973
1974 if (from->nh) {
1975 struct fib6_nh_match_arg arg = {
1976 .dev = rt->dst.dev,
1977 .gw = &rt->rt6i_gateway,
1978 };
1979
1980 nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg);
1981
1982 if (!arg.match)
1983 goto unlock;
1984 fib6_nh = arg.match;
1985 } else {
1986 fib6_nh = from->fib6_nh;
1987 }
1988 fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt);
1989unlock:
1990 rcu_read_unlock();
1991}
1992
1993static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
1994 struct rt6_info *rt, int mtu)
1995{
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006 if (dst_mtu(&rt->dst) >= mtu)
2007 return true;
2008
2009 if (dst_mtu(&rt->dst) == idev->cnf.mtu6)
2010 return true;
2011
2012 return false;
2013}
2014
2015static void rt6_exceptions_update_pmtu(struct inet6_dev *idev,
2016 const struct fib6_nh *nh, int mtu)
2017{
2018 struct rt6_exception_bucket *bucket;
2019 struct rt6_exception *rt6_ex;
2020 int i;
2021
2022 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
2023 if (!bucket)
2024 return;
2025
2026 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2027 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
2028 struct rt6_info *entry = rt6_ex->rt6i;
2029
2030
2031
2032
2033
2034 if (dst_metric_raw(&entry->dst, RTAX_MTU) &&
2035 rt6_mtu_change_route_allowed(idev, entry, mtu))
2036 dst_metric_set(&entry->dst, RTAX_MTU, mtu);
2037 }
2038 bucket++;
2039 }
2040}
2041
2042#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2043
2044static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh,
2045 const struct in6_addr *gateway)
2046{
2047 struct rt6_exception_bucket *bucket;
2048 struct rt6_exception *rt6_ex;
2049 struct hlist_node *tmp;
2050 int i;
2051
2052 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
2053 return;
2054
2055 spin_lock_bh(&rt6_exception_lock);
2056 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
2057 if (bucket) {
2058 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2059 hlist_for_each_entry_safe(rt6_ex, tmp,
2060 &bucket->chain, hlist) {
2061 struct rt6_info *entry = rt6_ex->rt6i;
2062
2063 if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) ==
2064 RTF_CACHE_GATEWAY &&
2065 ipv6_addr_equal(gateway,
2066 &entry->rt6i_gateway)) {
2067 rt6_remove_exception(bucket, rt6_ex);
2068 }
2069 }
2070 bucket++;
2071 }
2072 }
2073
2074 spin_unlock_bh(&rt6_exception_lock);
2075}
2076
2077static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket,
2078 struct rt6_exception *rt6_ex,
2079 struct fib6_gc_args *gc_args,
2080 unsigned long now)
2081{
2082 struct rt6_info *rt = rt6_ex->rt6i;
2083
2084
2085
2086
2087
2088
2089
2090 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
2091 if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) {
2092 RT6_TRACE("aging clone %p\n", rt);
2093 rt6_remove_exception(bucket, rt6_ex);
2094 return;
2095 }
2096 } else if (time_after(jiffies, rt->dst.expires)) {
2097 RT6_TRACE("purging expired route %p\n", rt);
2098 rt6_remove_exception(bucket, rt6_ex);
2099 return;
2100 }
2101
2102 if (rt->rt6i_flags & RTF_GATEWAY) {
2103 struct neighbour *neigh;
2104 __u8 neigh_flags = 0;
2105
2106 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
2107 if (neigh)
2108 neigh_flags = neigh->flags;
2109
2110 if (!(neigh_flags & NTF_ROUTER)) {
2111 RT6_TRACE("purging route %p via non-router but gateway\n",
2112 rt);
2113 rt6_remove_exception(bucket, rt6_ex);
2114 return;
2115 }
2116 }
2117
2118 gc_args->more++;
2119}
2120
2121static void fib6_nh_age_exceptions(const struct fib6_nh *nh,
2122 struct fib6_gc_args *gc_args,
2123 unsigned long now)
2124{
2125 struct rt6_exception_bucket *bucket;
2126 struct rt6_exception *rt6_ex;
2127 struct hlist_node *tmp;
2128 int i;
2129
2130 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
2131 return;
2132
2133 rcu_read_lock_bh();
2134 spin_lock(&rt6_exception_lock);
2135 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
2136 if (bucket) {
2137 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2138 hlist_for_each_entry_safe(rt6_ex, tmp,
2139 &bucket->chain, hlist) {
2140 rt6_age_examine_exception(bucket, rt6_ex,
2141 gc_args, now);
2142 }
2143 bucket++;
2144 }
2145 }
2146 spin_unlock(&rt6_exception_lock);
2147 rcu_read_unlock_bh();
2148}
2149
2150struct fib6_nh_age_excptn_arg {
2151 struct fib6_gc_args *gc_args;
2152 unsigned long now;
2153};
2154
2155static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg)
2156{
2157 struct fib6_nh_age_excptn_arg *arg = _arg;
2158
2159 fib6_nh_age_exceptions(nh, arg->gc_args, arg->now);
2160 return 0;
2161}
2162
2163void rt6_age_exceptions(struct fib6_info *f6i,
2164 struct fib6_gc_args *gc_args,
2165 unsigned long now)
2166{
2167 if (f6i->nh) {
2168 struct fib6_nh_age_excptn_arg arg = {
2169 .gc_args = gc_args,
2170 .now = now
2171 };
2172
2173 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions,
2174 &arg);
2175 } else {
2176 fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now);
2177 }
2178}
2179
2180
2181int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif,
2182 struct flowi6 *fl6, struct fib6_result *res, int strict)
2183{
2184 struct fib6_node *fn, *saved_fn;
2185
2186 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
2187 saved_fn = fn;
2188
2189 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
2190 oif = 0;
2191
2192redo_rt6_select:
2193 rt6_select(net, fn, oif, res, strict);
2194 if (res->f6i == net->ipv6.fib6_null_entry) {
2195 fn = fib6_backtrack(fn, &fl6->saddr);
2196 if (fn)
2197 goto redo_rt6_select;
2198 else if (strict & RT6_LOOKUP_F_REACHABLE) {
2199
2200 strict &= ~RT6_LOOKUP_F_REACHABLE;
2201 fn = saved_fn;
2202 goto redo_rt6_select;
2203 }
2204 }
2205
2206 trace_fib6_table_lookup(net, res, table, fl6);
2207
2208 return 0;
2209}
2210
2211struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
2212 int oif, struct flowi6 *fl6,
2213 const struct sk_buff *skb, int flags)
2214{
2215 struct fib6_result res = {};
2216 struct rt6_info *rt = NULL;
2217 int strict = 0;
2218
2219 WARN_ON_ONCE((flags & RT6_LOOKUP_F_DST_NOREF) &&
2220 !rcu_read_lock_held());
2221
2222 strict |= flags & RT6_LOOKUP_F_IFACE;
2223 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
2224 if (net->ipv6.devconf_all->forwarding == 0)
2225 strict |= RT6_LOOKUP_F_REACHABLE;
2226
2227 rcu_read_lock();
2228
2229 fib6_table_lookup(net, table, oif, fl6, &res, strict);
2230 if (res.f6i == net->ipv6.fib6_null_entry)
2231 goto out;
2232
2233 fib6_select_path(net, &res, fl6, oif, false, skb, strict);
2234
2235
2236 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
2237 if (rt) {
2238 goto out;
2239 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
2240 !res.nh->fib_nh_gw_family)) {
2241
2242
2243
2244
2245
2246 rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL);
2247
2248 if (rt) {
2249
2250
2251
2252
2253
2254 rt6_uncached_list_add(rt);
2255 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
2256 rcu_read_unlock();
2257
2258 return rt;
2259 }
2260 } else {
2261
2262 local_bh_disable();
2263 rt = rt6_get_pcpu_route(&res);
2264
2265 if (!rt)
2266 rt = rt6_make_pcpu_route(net, &res);
2267
2268 local_bh_enable();
2269 }
2270out:
2271 if (!rt)
2272 rt = net->ipv6.ip6_null_entry;
2273 if (!(flags & RT6_LOOKUP_F_DST_NOREF))
2274 ip6_hold_safe(net, &rt);
2275 rcu_read_unlock();
2276
2277 return rt;
2278}
2279EXPORT_SYMBOL_GPL(ip6_pol_route);
2280
2281INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_input(struct net *net,
2282 struct fib6_table *table,
2283 struct flowi6 *fl6,
2284 const struct sk_buff *skb,
2285 int flags)
2286{
2287 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags);
2288}
2289
2290struct dst_entry *ip6_route_input_lookup(struct net *net,
2291 struct net_device *dev,
2292 struct flowi6 *fl6,
2293 const struct sk_buff *skb,
2294 int flags)
2295{
2296 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
2297 flags |= RT6_LOOKUP_F_IFACE;
2298
2299 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input);
2300}
2301EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
2302
2303static void ip6_multipath_l3_keys(const struct sk_buff *skb,
2304 struct flow_keys *keys,
2305 struct flow_keys *flkeys)
2306{
2307 const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
2308 const struct ipv6hdr *key_iph = outer_iph;
2309 struct flow_keys *_flkeys = flkeys;
2310 const struct ipv6hdr *inner_iph;
2311 const struct icmp6hdr *icmph;
2312 struct ipv6hdr _inner_iph;
2313 struct icmp6hdr _icmph;
2314
2315 if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6))
2316 goto out;
2317
2318 icmph = skb_header_pointer(skb, skb_transport_offset(skb),
2319 sizeof(_icmph), &_icmph);
2320 if (!icmph)
2321 goto out;
2322
2323 if (!icmpv6_is_err(icmph->icmp6_type))
2324 goto out;
2325
2326 inner_iph = skb_header_pointer(skb,
2327 skb_transport_offset(skb) + sizeof(*icmph),
2328 sizeof(_inner_iph), &_inner_iph);
2329 if (!inner_iph)
2330 goto out;
2331
2332 key_iph = inner_iph;
2333 _flkeys = NULL;
2334out:
2335 if (_flkeys) {
2336 keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src;
2337 keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst;
2338 keys->tags.flow_label = _flkeys->tags.flow_label;
2339 keys->basic.ip_proto = _flkeys->basic.ip_proto;
2340 } else {
2341 keys->addrs.v6addrs.src = key_iph->saddr;
2342 keys->addrs.v6addrs.dst = key_iph->daddr;
2343 keys->tags.flow_label = ip6_flowlabel(key_iph);
2344 keys->basic.ip_proto = key_iph->nexthdr;
2345 }
2346}
2347
2348
2349u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
2350 const struct sk_buff *skb, struct flow_keys *flkeys)
2351{
2352 struct flow_keys hash_keys;
2353 u32 mhash;
2354
2355 switch (ip6_multipath_hash_policy(net)) {
2356 case 0:
2357 memset(&hash_keys, 0, sizeof(hash_keys));
2358 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2359 if (skb) {
2360 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2361 } else {
2362 hash_keys.addrs.v6addrs.src = fl6->saddr;
2363 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2364 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2365 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2366 }
2367 break;
2368 case 1:
2369 if (skb) {
2370 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
2371 struct flow_keys keys;
2372
2373
2374 if (skb->l4_hash)
2375 return skb_get_hash_raw(skb) >> 1;
2376
2377 memset(&hash_keys, 0, sizeof(hash_keys));
2378
2379 if (!flkeys) {
2380 skb_flow_dissect_flow_keys(skb, &keys, flag);
2381 flkeys = &keys;
2382 }
2383 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2384 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2385 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2386 hash_keys.ports.src = flkeys->ports.src;
2387 hash_keys.ports.dst = flkeys->ports.dst;
2388 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2389 } else {
2390 memset(&hash_keys, 0, sizeof(hash_keys));
2391 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2392 hash_keys.addrs.v6addrs.src = fl6->saddr;
2393 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2394 hash_keys.ports.src = fl6->fl6_sport;
2395 hash_keys.ports.dst = fl6->fl6_dport;
2396 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2397 }
2398 break;
2399 case 2:
2400 memset(&hash_keys, 0, sizeof(hash_keys));
2401 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2402 if (skb) {
2403 struct flow_keys keys;
2404
2405 if (!flkeys) {
2406 skb_flow_dissect_flow_keys(skb, &keys, 0);
2407 flkeys = &keys;
2408 }
2409
2410
2411 if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
2412 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
2413 hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src;
2414 hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst;
2415 } else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
2416 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2417 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2418 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2419 hash_keys.tags.flow_label = flkeys->tags.flow_label;
2420 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2421 } else {
2422
2423 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2424 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2425 }
2426 } else {
2427
2428 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2429 hash_keys.addrs.v6addrs.src = fl6->saddr;
2430 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2431 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2432 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2433 }
2434 break;
2435 }
2436 mhash = flow_hash_from_keys(&hash_keys);
2437
2438 return mhash >> 1;
2439}
2440
2441
2442void ip6_route_input(struct sk_buff *skb)
2443{
2444 const struct ipv6hdr *iph = ipv6_hdr(skb);
2445 struct net *net = dev_net(skb->dev);
2446 int flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_DST_NOREF;
2447 struct ip_tunnel_info *tun_info;
2448 struct flowi6 fl6 = {
2449 .flowi6_iif = skb->dev->ifindex,
2450 .daddr = iph->daddr,
2451 .saddr = iph->saddr,
2452 .flowlabel = ip6_flowinfo(iph),
2453 .flowi6_mark = skb->mark,
2454 .flowi6_proto = iph->nexthdr,
2455 };
2456 struct flow_keys *flkeys = NULL, _flkeys;
2457
2458 tun_info = skb_tunnel_info(skb);
2459 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
2460 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
2461
2462 if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys))
2463 flkeys = &_flkeys;
2464
2465 if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6))
2466 fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys);
2467 skb_dst_drop(skb);
2468 skb_dst_set_noref(skb, ip6_route_input_lookup(net, skb->dev,
2469 &fl6, skb, flags));
2470}
2471
2472INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_output(struct net *net,
2473 struct fib6_table *table,
2474 struct flowi6 *fl6,
2475 const struct sk_buff *skb,
2476 int flags)
2477{
2478 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags);
2479}
2480
2481struct dst_entry *ip6_route_output_flags_noref(struct net *net,
2482 const struct sock *sk,
2483 struct flowi6 *fl6, int flags)
2484{
2485 bool any_src;
2486
2487 if (ipv6_addr_type(&fl6->daddr) &
2488 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) {
2489 struct dst_entry *dst;
2490
2491
2492 dst = l3mdev_link_scope_lookup(net, fl6);
2493 if (dst)
2494 return dst;
2495 }
2496
2497 fl6->flowi6_iif = LOOPBACK_IFINDEX;
2498
2499 flags |= RT6_LOOKUP_F_DST_NOREF;
2500 any_src = ipv6_addr_any(&fl6->saddr);
2501 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
2502 (fl6->flowi6_oif && any_src))
2503 flags |= RT6_LOOKUP_F_IFACE;
2504
2505 if (!any_src)
2506 flags |= RT6_LOOKUP_F_HAS_SADDR;
2507 else if (sk)
2508 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
2509
2510 return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output);
2511}
2512EXPORT_SYMBOL_GPL(ip6_route_output_flags_noref);
2513
2514struct dst_entry *ip6_route_output_flags(struct net *net,
2515 const struct sock *sk,
2516 struct flowi6 *fl6,
2517 int flags)
2518{
2519 struct dst_entry *dst;
2520 struct rt6_info *rt6;
2521
2522 rcu_read_lock();
2523 dst = ip6_route_output_flags_noref(net, sk, fl6, flags);
2524 rt6 = (struct rt6_info *)dst;
2525
2526 if (list_empty(&rt6->rt6i_uncached) && !dst_hold_safe(dst)) {
2527 dst = &net->ipv6.ip6_null_entry->dst;
2528 dst_hold(dst);
2529 }
2530 rcu_read_unlock();
2531
2532 return dst;
2533}
2534EXPORT_SYMBOL_GPL(ip6_route_output_flags);
2535
2536struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
2537{
2538 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
2539 struct net_device *loopback_dev = net->loopback_dev;
2540 struct dst_entry *new = NULL;
2541
2542 rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
2543 DST_OBSOLETE_DEAD, 0);
2544 if (rt) {
2545 rt6_info_init(rt);
2546 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
2547
2548 new = &rt->dst;
2549 new->__use = 1;
2550 new->input = dst_discard;
2551 new->output = dst_discard_out;
2552
2553 dst_copy_metrics(new, &ort->dst);
2554
2555 rt->rt6i_idev = in6_dev_get(loopback_dev);
2556 rt->rt6i_gateway = ort->rt6i_gateway;
2557 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
2558
2559 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
2560#ifdef CONFIG_IPV6_SUBTREES
2561 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
2562#endif
2563 }
2564
2565 dst_release(dst_orig);
2566 return new ? new : ERR_PTR(-ENOMEM);
2567}
2568
2569
2570
2571
2572
2573static bool fib6_check(struct fib6_info *f6i, u32 cookie)
2574{
2575 u32 rt_cookie = 0;
2576
2577 if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie)
2578 return false;
2579
2580 if (fib6_check_expired(f6i))
2581 return false;
2582
2583 return true;
2584}
2585
2586static struct dst_entry *rt6_check(struct rt6_info *rt,
2587 struct fib6_info *from,
2588 u32 cookie)
2589{
2590 u32 rt_cookie = 0;
2591
2592 if (!from || !fib6_get_cookie_safe(from, &rt_cookie) ||
2593 rt_cookie != cookie)
2594 return NULL;
2595
2596 if (rt6_check_expired(rt))
2597 return NULL;
2598
2599 return &rt->dst;
2600}
2601
2602static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt,
2603 struct fib6_info *from,
2604 u32 cookie)
2605{
2606 if (!__rt6_check_expired(rt) &&
2607 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
2608 fib6_check(from, cookie))
2609 return &rt->dst;
2610 else
2611 return NULL;
2612}
2613
2614static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
2615{
2616 struct dst_entry *dst_ret;
2617 struct fib6_info *from;
2618 struct rt6_info *rt;
2619
2620 rt = container_of(dst, struct rt6_info, dst);
2621
2622 if (rt->sernum)
2623 return rt6_is_valid(rt) ? dst : NULL;
2624
2625 rcu_read_lock();
2626
2627
2628
2629
2630
2631
2632 from = rcu_dereference(rt->from);
2633
2634 if (from && (rt->rt6i_flags & RTF_PCPU ||
2635 unlikely(!list_empty(&rt->rt6i_uncached))))
2636 dst_ret = rt6_dst_from_check(rt, from, cookie);
2637 else
2638 dst_ret = rt6_check(rt, from, cookie);
2639
2640 rcu_read_unlock();
2641
2642 return dst_ret;
2643}
2644
2645static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
2646{
2647 struct rt6_info *rt = (struct rt6_info *) dst;
2648
2649 if (rt) {
2650 if (rt->rt6i_flags & RTF_CACHE) {
2651 rcu_read_lock();
2652 if (rt6_check_expired(rt)) {
2653 rt6_remove_exception_rt(rt);
2654 dst = NULL;
2655 }
2656 rcu_read_unlock();
2657 } else {
2658 dst_release(dst);
2659 dst = NULL;
2660 }
2661 }
2662 return dst;
2663}
2664
2665static void ip6_link_failure(struct sk_buff *skb)
2666{
2667 struct rt6_info *rt;
2668
2669 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
2670
2671 rt = (struct rt6_info *) skb_dst(skb);
2672 if (rt) {
2673 rcu_read_lock();
2674 if (rt->rt6i_flags & RTF_CACHE) {
2675 rt6_remove_exception_rt(rt);
2676 } else {
2677 struct fib6_info *from;
2678 struct fib6_node *fn;
2679
2680 from = rcu_dereference(rt->from);
2681 if (from) {
2682 fn = rcu_dereference(from->fib6_node);
2683 if (fn && (rt->rt6i_flags & RTF_DEFAULT))
2684 fn->fn_sernum = -1;
2685 }
2686 }
2687 rcu_read_unlock();
2688 }
2689}
2690
2691static void rt6_update_expires(struct rt6_info *rt0, int timeout)
2692{
2693 if (!(rt0->rt6i_flags & RTF_EXPIRES)) {
2694 struct fib6_info *from;
2695
2696 rcu_read_lock();
2697 from = rcu_dereference(rt0->from);
2698 if (from)
2699 rt0->dst.expires = from->expires;
2700 rcu_read_unlock();
2701 }
2702
2703 dst_set_expires(&rt0->dst, timeout);
2704 rt0->rt6i_flags |= RTF_EXPIRES;
2705}
2706
2707static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
2708{
2709 struct net *net = dev_net(rt->dst.dev);
2710
2711 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
2712 rt->rt6i_flags |= RTF_MODIFIED;
2713 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
2714}
2715
2716static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
2717{
2718 return !(rt->rt6i_flags & RTF_CACHE) &&
2719 (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from));
2720}
2721
2722static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
2723 const struct ipv6hdr *iph, u32 mtu,
2724 bool confirm_neigh)
2725{
2726 const struct in6_addr *daddr, *saddr;
2727 struct rt6_info *rt6 = (struct rt6_info *)dst;
2728
2729
2730
2731
2732
2733
2734 if (iph) {
2735 daddr = &iph->daddr;
2736 saddr = &iph->saddr;
2737 } else if (sk) {
2738 daddr = &sk->sk_v6_daddr;
2739 saddr = &inet6_sk(sk)->saddr;
2740 } else {
2741 daddr = NULL;
2742 saddr = NULL;
2743 }
2744
2745 if (confirm_neigh)
2746 dst_confirm_neigh(dst, daddr);
2747
2748 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
2749 if (mtu >= dst_mtu(dst))
2750 return;
2751
2752 if (!rt6_cache_allowed_for_pmtu(rt6)) {
2753 rt6_do_update_pmtu(rt6, mtu);
2754
2755 if (rt6->rt6i_flags & RTF_CACHE)
2756 rt6_update_exception_stamp_rt(rt6);
2757 } else if (daddr) {
2758 struct fib6_result res = {};
2759 struct rt6_info *nrt6;
2760
2761 rcu_read_lock();
2762 res.f6i = rcu_dereference(rt6->from);
2763 if (!res.f6i)
2764 goto out_unlock;
2765
2766 res.fib6_flags = res.f6i->fib6_flags;
2767 res.fib6_type = res.f6i->fib6_type;
2768
2769 if (res.f6i->nh) {
2770 struct fib6_nh_match_arg arg = {
2771 .dev = dst->dev,
2772 .gw = &rt6->rt6i_gateway,
2773 };
2774
2775 nexthop_for_each_fib6_nh(res.f6i->nh,
2776 fib6_nh_find_match, &arg);
2777
2778
2779
2780
2781 if (!arg.match)
2782 goto out_unlock;
2783
2784 res.nh = arg.match;
2785 } else {
2786 res.nh = res.f6i->fib6_nh;
2787 }
2788
2789 nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr);
2790 if (nrt6) {
2791 rt6_do_update_pmtu(nrt6, mtu);
2792 if (rt6_insert_exception(nrt6, &res))
2793 dst_release_immediate(&nrt6->dst);
2794 }
2795out_unlock:
2796 rcu_read_unlock();
2797 }
2798}
2799
2800static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
2801 struct sk_buff *skb, u32 mtu,
2802 bool confirm_neigh)
2803{
2804 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu,
2805 confirm_neigh);
2806}
2807
2808void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
2809 int oif, u32 mark, kuid_t uid)
2810{
2811 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
2812 struct dst_entry *dst;
2813 struct flowi6 fl6 = {
2814 .flowi6_oif = oif,
2815 .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark),
2816 .daddr = iph->daddr,
2817 .saddr = iph->saddr,
2818 .flowlabel = ip6_flowinfo(iph),
2819 .flowi6_uid = uid,
2820 };
2821
2822 dst = ip6_route_output(net, NULL, &fl6);
2823 if (!dst->error)
2824 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu), true);
2825 dst_release(dst);
2826}
2827EXPORT_SYMBOL_GPL(ip6_update_pmtu);
2828
2829void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
2830{
2831 int oif = sk->sk_bound_dev_if;
2832 struct dst_entry *dst;
2833
2834 if (!oif && skb->dev)
2835 oif = l3mdev_master_ifindex(skb->dev);
2836
2837 ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid);
2838
2839 dst = __sk_dst_get(sk);
2840 if (!dst || !dst->obsolete ||
2841 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
2842 return;
2843
2844 bh_lock_sock(sk);
2845 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
2846 ip6_datagram_dst_update(sk, false);
2847 bh_unlock_sock(sk);
2848}
2849EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
2850
2851void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
2852 const struct flowi6 *fl6)
2853{
2854#ifdef CONFIG_IPV6_SUBTREES
2855 struct ipv6_pinfo *np = inet6_sk(sk);
2856#endif
2857
2858 ip6_dst_store(sk, dst,
2859 ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
2860 &sk->sk_v6_daddr : NULL,
2861#ifdef CONFIG_IPV6_SUBTREES
2862 ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
2863 &np->saddr :
2864#endif
2865 NULL);
2866}
2867
2868static bool ip6_redirect_nh_match(const struct fib6_result *res,
2869 struct flowi6 *fl6,
2870 const struct in6_addr *gw,
2871 struct rt6_info **ret)
2872{
2873 const struct fib6_nh *nh = res->nh;
2874
2875 if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family ||
2876 fl6->flowi6_oif != nh->fib_nh_dev->ifindex)
2877 return false;
2878
2879
2880
2881
2882
2883
2884 if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) {
2885 struct rt6_info *rt_cache;
2886
2887 rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr);
2888 if (rt_cache &&
2889 ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) {
2890 *ret = rt_cache;
2891 return true;
2892 }
2893 return false;
2894 }
2895 return true;
2896}
2897
2898struct fib6_nh_rd_arg {
2899 struct fib6_result *res;
2900 struct flowi6 *fl6;
2901 const struct in6_addr *gw;
2902 struct rt6_info **ret;
2903};
2904
2905static int fib6_nh_redirect_match(struct fib6_nh *nh, void *_arg)
2906{
2907 struct fib6_nh_rd_arg *arg = _arg;
2908
2909 arg->res->nh = nh;
2910 return ip6_redirect_nh_match(arg->res, arg->fl6, arg->gw, arg->ret);
2911}
2912
2913
2914struct ip6rd_flowi {
2915 struct flowi6 fl6;
2916 struct in6_addr gateway;
2917};
2918
2919INDIRECT_CALLABLE_SCOPE struct rt6_info *__ip6_route_redirect(struct net *net,
2920 struct fib6_table *table,
2921 struct flowi6 *fl6,
2922 const struct sk_buff *skb,
2923 int flags)
2924{
2925 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
2926 struct rt6_info *ret = NULL;
2927 struct fib6_result res = {};
2928 struct fib6_nh_rd_arg arg = {
2929 .res = &res,
2930 .fl6 = fl6,
2931 .gw = &rdfl->gateway,
2932 .ret = &ret
2933 };
2934 struct fib6_info *rt;
2935 struct fib6_node *fn;
2936
2937
2938
2939
2940 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
2941 fl6->flowi6_oif = skb->dev->ifindex;
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953 rcu_read_lock();
2954 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
2955restart:
2956 for_each_fib6_node_rt_rcu(fn) {
2957 res.f6i = rt;
2958 if (fib6_check_expired(rt))
2959 continue;
2960 if (rt->fib6_flags & RTF_REJECT)
2961 break;
2962 if (unlikely(rt->nh)) {
2963 if (nexthop_is_blackhole(rt->nh))
2964 continue;
2965
2966 if (nexthop_for_each_fib6_nh(rt->nh,
2967 fib6_nh_redirect_match,
2968 &arg))
2969 goto out;
2970 } else {
2971 res.nh = rt->fib6_nh;
2972 if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway,
2973 &ret))
2974 goto out;
2975 }
2976 }
2977
2978 if (!rt)
2979 rt = net->ipv6.fib6_null_entry;
2980 else if (rt->fib6_flags & RTF_REJECT) {
2981 ret = net->ipv6.ip6_null_entry;
2982 goto out;
2983 }
2984
2985 if (rt == net->ipv6.fib6_null_entry) {
2986 fn = fib6_backtrack(fn, &fl6->saddr);
2987 if (fn)
2988 goto restart;
2989 }
2990
2991 res.f6i = rt;
2992 res.nh = rt->fib6_nh;
2993out:
2994 if (ret) {
2995 ip6_hold_safe(net, &ret);
2996 } else {
2997 res.fib6_flags = res.f6i->fib6_flags;
2998 res.fib6_type = res.f6i->fib6_type;
2999 ret = ip6_create_rt_rcu(&res);
3000 }
3001
3002 rcu_read_unlock();
3003
3004 trace_fib6_table_lookup(net, &res, table, fl6);
3005 return ret;
3006};
3007
3008static struct dst_entry *ip6_route_redirect(struct net *net,
3009 const struct flowi6 *fl6,
3010 const struct sk_buff *skb,
3011 const struct in6_addr *gateway)
3012{
3013 int flags = RT6_LOOKUP_F_HAS_SADDR;
3014 struct ip6rd_flowi rdfl;
3015
3016 rdfl.fl6 = *fl6;
3017 rdfl.gateway = *gateway;
3018
3019 return fib6_rule_lookup(net, &rdfl.fl6, skb,
3020 flags, __ip6_route_redirect);
3021}
3022
3023void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
3024 kuid_t uid)
3025{
3026 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
3027 struct dst_entry *dst;
3028 struct flowi6 fl6 = {
3029 .flowi6_iif = LOOPBACK_IFINDEX,
3030 .flowi6_oif = oif,
3031 .flowi6_mark = mark,
3032 .daddr = iph->daddr,
3033 .saddr = iph->saddr,
3034 .flowlabel = ip6_flowinfo(iph),
3035 .flowi6_uid = uid,
3036 };
3037
3038 dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr);
3039 rt6_do_redirect(dst, NULL, skb);
3040 dst_release(dst);
3041}
3042EXPORT_SYMBOL_GPL(ip6_redirect);
3043
3044void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif)
3045{
3046 const struct ipv6hdr *iph = ipv6_hdr(skb);
3047 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
3048 struct dst_entry *dst;
3049 struct flowi6 fl6 = {
3050 .flowi6_iif = LOOPBACK_IFINDEX,
3051 .flowi6_oif = oif,
3052 .daddr = msg->dest,
3053 .saddr = iph->daddr,
3054 .flowi6_uid = sock_net_uid(net, NULL),
3055 };
3056
3057 dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr);
3058 rt6_do_redirect(dst, NULL, skb);
3059 dst_release(dst);
3060}
3061
3062void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
3063{
3064 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
3065 sk->sk_uid);
3066}
3067EXPORT_SYMBOL_GPL(ip6_sk_redirect);
3068
3069static unsigned int ip6_default_advmss(const struct dst_entry *dst)
3070{
3071 struct net_device *dev = dst->dev;
3072 unsigned int mtu = dst_mtu(dst);
3073 struct net *net = dev_net(dev);
3074
3075 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
3076
3077 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
3078 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
3079
3080
3081
3082
3083
3084
3085
3086 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
3087 mtu = IPV6_MAXPLEN;
3088 return mtu;
3089}
3090
3091static unsigned int ip6_mtu(const struct dst_entry *dst)
3092{
3093 struct inet6_dev *idev;
3094 unsigned int mtu;
3095
3096 mtu = dst_metric_raw(dst, RTAX_MTU);
3097 if (mtu)
3098 goto out;
3099
3100 mtu = IPV6_MIN_MTU;
3101
3102 rcu_read_lock();
3103 idev = __in6_dev_get(dst->dev);
3104 if (idev)
3105 mtu = idev->cnf.mtu6;
3106 rcu_read_unlock();
3107
3108out:
3109 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
3110
3111 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
3112}
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122u32 ip6_mtu_from_fib6(const struct fib6_result *res,
3123 const struct in6_addr *daddr,
3124 const struct in6_addr *saddr)
3125{
3126 const struct fib6_nh *nh = res->nh;
3127 struct fib6_info *f6i = res->f6i;
3128 struct inet6_dev *idev;
3129 struct rt6_info *rt;
3130 u32 mtu = 0;
3131
3132 if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) {
3133 mtu = f6i->fib6_pmtu;
3134 if (mtu)
3135 goto out;
3136 }
3137
3138 rt = rt6_find_cached_rt(res, daddr, saddr);
3139 if (unlikely(rt)) {
3140 mtu = dst_metric_raw(&rt->dst, RTAX_MTU);
3141 } else {
3142 struct net_device *dev = nh->fib_nh_dev;
3143
3144 mtu = IPV6_MIN_MTU;
3145 idev = __in6_dev_get(dev);
3146 if (idev && idev->cnf.mtu6 > mtu)
3147 mtu = idev->cnf.mtu6;
3148 }
3149
3150 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
3151out:
3152 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
3153}
3154
3155struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
3156 struct flowi6 *fl6)
3157{
3158 struct dst_entry *dst;
3159 struct rt6_info *rt;
3160 struct inet6_dev *idev = in6_dev_get(dev);
3161 struct net *net = dev_net(dev);
3162
3163 if (unlikely(!idev))
3164 return ERR_PTR(-ENODEV);
3165
3166 rt = ip6_dst_alloc(net, dev, 0);
3167 if (unlikely(!rt)) {
3168 in6_dev_put(idev);
3169 dst = ERR_PTR(-ENOMEM);
3170 goto out;
3171 }
3172
3173 rt->dst.input = ip6_input;
3174 rt->dst.output = ip6_output;
3175 rt->rt6i_gateway = fl6->daddr;
3176 rt->rt6i_dst.addr = fl6->daddr;
3177 rt->rt6i_dst.plen = 128;
3178 rt->rt6i_idev = idev;
3179 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
3180
3181
3182
3183
3184 rt6_uncached_list_add(rt);
3185 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
3186
3187 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
3188
3189out:
3190 return dst;
3191}
3192
3193static int ip6_dst_gc(struct dst_ops *ops)
3194{
3195 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
3196 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
3197 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
3198 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
3199 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
3200 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
3201 int entries;
3202
3203 entries = dst_entries_get_fast(ops);
3204 if (entries > rt_max_size)
3205 entries = dst_entries_get_slow(ops);
3206
3207 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
3208 entries <= rt_max_size)
3209 goto out;
3210
3211 net->ipv6.ip6_rt_gc_expire++;
3212 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
3213 entries = dst_entries_get_slow(ops);
3214 if (entries < ops->gc_thresh)
3215 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
3216out:
3217 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
3218 return entries > rt_max_size;
3219}
3220
3221static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg,
3222 const struct in6_addr *gw_addr, u32 tbid,
3223 int flags, struct fib6_result *res)
3224{
3225 struct flowi6 fl6 = {
3226 .flowi6_oif = cfg->fc_ifindex,
3227 .daddr = *gw_addr,
3228 .saddr = cfg->fc_prefsrc,
3229 };
3230 struct fib6_table *table;
3231 int err;
3232
3233 table = fib6_get_table(net, tbid);
3234 if (!table)
3235 return -EINVAL;
3236
3237 if (!ipv6_addr_any(&cfg->fc_prefsrc))
3238 flags |= RT6_LOOKUP_F_HAS_SADDR;
3239
3240 flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE;
3241
3242 err = fib6_table_lookup(net, table, cfg->fc_ifindex, &fl6, res, flags);
3243 if (!err && res->f6i != net->ipv6.fib6_null_entry)
3244 fib6_select_path(net, res, &fl6, cfg->fc_ifindex,
3245 cfg->fc_ifindex != 0, NULL, flags);
3246
3247 return err;
3248}
3249
3250static int ip6_route_check_nh_onlink(struct net *net,
3251 struct fib6_config *cfg,
3252 const struct net_device *dev,
3253 struct netlink_ext_ack *extack)
3254{
3255 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
3256 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3257 struct fib6_result res = {};
3258 int err;
3259
3260 err = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0, &res);
3261 if (!err && !(res.fib6_flags & RTF_REJECT) &&
3262
3263 !ipv6_addr_any(&res.f6i->fib6_dst.addr) &&
3264 (res.fib6_type != RTN_UNICAST || dev != res.nh->fib_nh_dev)) {
3265 NL_SET_ERR_MSG(extack,
3266 "Nexthop has invalid gateway or device mismatch");
3267 err = -EINVAL;
3268 }
3269
3270 return err;
3271}
3272
3273static int ip6_route_check_nh(struct net *net,
3274 struct fib6_config *cfg,
3275 struct net_device **_dev,
3276 struct inet6_dev **idev)
3277{
3278 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3279 struct net_device *dev = _dev ? *_dev : NULL;
3280 int flags = RT6_LOOKUP_F_IFACE;
3281 struct fib6_result res = {};
3282 int err = -EHOSTUNREACH;
3283
3284 if (cfg->fc_table) {
3285 err = ip6_nh_lookup_table(net, cfg, gw_addr,
3286 cfg->fc_table, flags, &res);
3287
3288
3289
3290 if (err || res.fib6_flags & RTF_REJECT ||
3291 res.nh->fib_nh_gw_family ||
3292 (dev && dev != res.nh->fib_nh_dev))
3293 err = -EHOSTUNREACH;
3294 }
3295
3296 if (err < 0) {
3297 struct flowi6 fl6 = {
3298 .flowi6_oif = cfg->fc_ifindex,
3299 .daddr = *gw_addr,
3300 };
3301
3302 err = fib6_lookup(net, cfg->fc_ifindex, &fl6, &res, flags);
3303 if (err || res.fib6_flags & RTF_REJECT ||
3304 res.nh->fib_nh_gw_family)
3305 err = -EHOSTUNREACH;
3306
3307 if (err)
3308 return err;
3309
3310 fib6_select_path(net, &res, &fl6, cfg->fc_ifindex,
3311 cfg->fc_ifindex != 0, NULL, flags);
3312 }
3313
3314 err = 0;
3315 if (dev) {
3316 if (dev != res.nh->fib_nh_dev)
3317 err = -EHOSTUNREACH;
3318 } else {
3319 *_dev = dev = res.nh->fib_nh_dev;
3320 dev_hold(dev);
3321 *idev = in6_dev_get(dev);
3322 }
3323
3324 return err;
3325}
3326
3327static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
3328 struct net_device **_dev, struct inet6_dev **idev,
3329 struct netlink_ext_ack *extack)
3330{
3331 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3332 int gwa_type = ipv6_addr_type(gw_addr);
3333 bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true;
3334 const struct net_device *dev = *_dev;
3335 bool need_addr_check = !dev;
3336 int err = -EINVAL;
3337
3338
3339
3340
3341
3342
3343 if (dev &&
3344 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3345 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
3346 goto out;
3347 }
3348
3349 if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) {
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359 if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) {
3360 NL_SET_ERR_MSG(extack, "Invalid gateway address");
3361 goto out;
3362 }
3363
3364 rcu_read_lock();
3365
3366 if (cfg->fc_flags & RTNH_F_ONLINK)
3367 err = ip6_route_check_nh_onlink(net, cfg, dev, extack);
3368 else
3369 err = ip6_route_check_nh(net, cfg, _dev, idev);
3370
3371 rcu_read_unlock();
3372
3373 if (err)
3374 goto out;
3375 }
3376
3377
3378 dev = *_dev;
3379
3380 err = -EINVAL;
3381 if (!dev) {
3382 NL_SET_ERR_MSG(extack, "Egress device not specified");
3383 goto out;
3384 } else if (dev->flags & IFF_LOOPBACK) {
3385 NL_SET_ERR_MSG(extack,
3386 "Egress device can not be loopback device for this route");
3387 goto out;
3388 }
3389
3390
3391
3392
3393 if (need_addr_check &&
3394 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3395 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
3396 goto out;
3397 }
3398
3399 err = 0;
3400out:
3401 return err;
3402}
3403
3404static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type)
3405{
3406 if ((flags & RTF_REJECT) ||
3407 (dev && (dev->flags & IFF_LOOPBACK) &&
3408 !(addr_type & IPV6_ADDR_LOOPBACK) &&
3409 !(flags & (RTF_ANYCAST | RTF_LOCAL))))
3410 return true;
3411
3412 return false;
3413}
3414
3415int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
3416 struct fib6_config *cfg, gfp_t gfp_flags,
3417 struct netlink_ext_ack *extack)
3418{
3419 struct net_device *dev = NULL;
3420 struct inet6_dev *idev = NULL;
3421 int addr_type;
3422 int err;
3423
3424 fib6_nh->fib_nh_family = AF_INET6;
3425#ifdef CONFIG_IPV6_ROUTER_PREF
3426 fib6_nh->last_probe = jiffies;
3427#endif
3428 if (cfg->fc_is_fdb) {
3429 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
3430 fib6_nh->fib_nh_gw_family = AF_INET6;
3431 return 0;
3432 }
3433
3434 err = -ENODEV;
3435 if (cfg->fc_ifindex) {
3436 dev = dev_get_by_index(net, cfg->fc_ifindex);
3437 if (!dev)
3438 goto out;
3439 idev = in6_dev_get(dev);
3440 if (!idev)
3441 goto out;
3442 }
3443
3444 if (cfg->fc_flags & RTNH_F_ONLINK) {
3445 if (!dev) {
3446 NL_SET_ERR_MSG(extack,
3447 "Nexthop device required for onlink");
3448 goto out;
3449 }
3450
3451 if (!(dev->flags & IFF_UP)) {
3452 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3453 err = -ENETDOWN;
3454 goto out;
3455 }
3456
3457 fib6_nh->fib_nh_flags |= RTNH_F_ONLINK;
3458 }
3459
3460 fib6_nh->fib_nh_weight = 1;
3461
3462
3463
3464
3465 addr_type = ipv6_addr_type(&cfg->fc_dst);
3466 if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) {
3467
3468 if (dev != net->loopback_dev) {
3469 if (dev) {
3470 dev_put(dev);
3471 in6_dev_put(idev);
3472 }
3473 dev = net->loopback_dev;
3474 dev_hold(dev);
3475 idev = in6_dev_get(dev);
3476 if (!idev) {
3477 err = -ENODEV;
3478 goto out;
3479 }
3480 }
3481 goto pcpu_alloc;
3482 }
3483
3484 if (cfg->fc_flags & RTF_GATEWAY) {
3485 err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
3486 if (err)
3487 goto out;
3488
3489 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
3490 fib6_nh->fib_nh_gw_family = AF_INET6;
3491 }
3492
3493 err = -ENODEV;
3494 if (!dev)
3495 goto out;
3496
3497 if (idev->cnf.disable_ipv6) {
3498 NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
3499 err = -EACCES;
3500 goto out;
3501 }
3502
3503 if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) {
3504 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3505 err = -ENETDOWN;
3506 goto out;
3507 }
3508
3509 if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
3510 !netif_carrier_ok(dev))
3511 fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
3512
3513 err = fib_nh_common_init(net, &fib6_nh->nh_common, cfg->fc_encap,
3514 cfg->fc_encap_type, cfg, gfp_flags, extack);
3515 if (err)
3516 goto out;
3517
3518pcpu_alloc:
3519 fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
3520 if (!fib6_nh->rt6i_pcpu) {
3521 err = -ENOMEM;
3522 goto out;
3523 }
3524
3525 fib6_nh->fib_nh_dev = dev;
3526 fib6_nh->fib_nh_oif = dev->ifindex;
3527 err = 0;
3528out:
3529 if (idev)
3530 in6_dev_put(idev);
3531
3532 if (err) {
3533 lwtstate_put(fib6_nh->fib_nh_lws);
3534 fib6_nh->fib_nh_lws = NULL;
3535 if (dev)
3536 dev_put(dev);
3537 }
3538
3539 return err;
3540}
3541
3542void fib6_nh_release(struct fib6_nh *fib6_nh)
3543{
3544 struct rt6_exception_bucket *bucket;
3545
3546 rcu_read_lock();
3547
3548 fib6_nh_flush_exceptions(fib6_nh, NULL);
3549 bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL);
3550 if (bucket) {
3551 rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL);
3552 kfree(bucket);
3553 }
3554
3555 rcu_read_unlock();
3556
3557 if (fib6_nh->rt6i_pcpu) {
3558 int cpu;
3559
3560 for_each_possible_cpu(cpu) {
3561 struct rt6_info **ppcpu_rt;
3562 struct rt6_info *pcpu_rt;
3563
3564 ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu);
3565 pcpu_rt = *ppcpu_rt;
3566 if (pcpu_rt) {
3567 dst_dev_put(&pcpu_rt->dst);
3568 dst_release(&pcpu_rt->dst);
3569 *ppcpu_rt = NULL;
3570 }
3571 }
3572
3573 free_percpu(fib6_nh->rt6i_pcpu);
3574 }
3575
3576 fib_nh_common_release(&fib6_nh->nh_common);
3577}
3578
3579static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
3580 gfp_t gfp_flags,
3581 struct netlink_ext_ack *extack)
3582{
3583 struct net *net = cfg->fc_nlinfo.nl_net;
3584 struct fib6_info *rt = NULL;
3585 struct nexthop *nh = NULL;
3586 struct fib6_table *table;
3587 struct fib6_nh *fib6_nh;
3588 int err = -EINVAL;
3589 int addr_type;
3590
3591
3592 if (cfg->fc_flags & RTF_PCPU) {
3593 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
3594 goto out;
3595 }
3596
3597
3598 if (cfg->fc_flags & RTF_CACHE) {
3599 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE");
3600 goto out;
3601 }
3602
3603 if (cfg->fc_type > RTN_MAX) {
3604 NL_SET_ERR_MSG(extack, "Invalid route type");
3605 goto out;
3606 }
3607
3608 if (cfg->fc_dst_len > 128) {
3609 NL_SET_ERR_MSG(extack, "Invalid prefix length");
3610 goto out;
3611 }
3612 if (cfg->fc_src_len > 128) {
3613 NL_SET_ERR_MSG(extack, "Invalid source address length");
3614 goto out;
3615 }
3616#ifndef CONFIG_IPV6_SUBTREES
3617 if (cfg->fc_src_len) {
3618 NL_SET_ERR_MSG(extack,
3619 "Specifying source address requires IPV6_SUBTREES to be enabled");
3620 goto out;
3621 }
3622#endif
3623 if (cfg->fc_nh_id) {
3624 nh = nexthop_find_by_id(net, cfg->fc_nh_id);
3625 if (!nh) {
3626 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
3627 goto out;
3628 }
3629 err = fib6_check_nexthop(nh, cfg, extack);
3630 if (err)
3631 goto out;
3632 }
3633
3634 err = -ENOBUFS;
3635 if (cfg->fc_nlinfo.nlh &&
3636 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
3637 table = fib6_get_table(net, cfg->fc_table);
3638 if (!table) {
3639 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
3640 table = fib6_new_table(net, cfg->fc_table);
3641 }
3642 } else {
3643 table = fib6_new_table(net, cfg->fc_table);
3644 }
3645
3646 if (!table)
3647 goto out;
3648
3649 err = -ENOMEM;
3650 rt = fib6_info_alloc(gfp_flags, !nh);
3651 if (!rt)
3652 goto out;
3653
3654 rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len,
3655 extack);
3656 if (IS_ERR(rt->fib6_metrics)) {
3657 err = PTR_ERR(rt->fib6_metrics);
3658
3659 rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
3660 goto out;
3661 }
3662
3663 if (cfg->fc_flags & RTF_ADDRCONF)
3664 rt->dst_nocount = true;
3665
3666 if (cfg->fc_flags & RTF_EXPIRES)
3667 fib6_set_expires(rt, jiffies +
3668 clock_t_to_jiffies(cfg->fc_expires));
3669 else
3670 fib6_clean_expires(rt);
3671
3672 if (cfg->fc_protocol == RTPROT_UNSPEC)
3673 cfg->fc_protocol = RTPROT_BOOT;
3674 rt->fib6_protocol = cfg->fc_protocol;
3675
3676 rt->fib6_table = table;
3677 rt->fib6_metric = cfg->fc_metric;
3678 rt->fib6_type = cfg->fc_type ? : RTN_UNICAST;
3679 rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY;
3680
3681 ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
3682 rt->fib6_dst.plen = cfg->fc_dst_len;
3683
3684#ifdef CONFIG_IPV6_SUBTREES
3685 ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len);
3686 rt->fib6_src.plen = cfg->fc_src_len;
3687#endif
3688 if (nh) {
3689 if (rt->fib6_src.plen) {
3690 NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing");
3691 goto out;
3692 }
3693 if (!nexthop_get(nh)) {
3694 NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
3695 goto out;
3696 }
3697 rt->nh = nh;
3698 fib6_nh = nexthop_fib6_nh(rt->nh);
3699 } else {
3700 err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack);
3701 if (err)
3702 goto out;
3703
3704 fib6_nh = rt->fib6_nh;
3705
3706
3707
3708
3709 addr_type = ipv6_addr_type(&cfg->fc_dst);
3710 if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev,
3711 addr_type))
3712 rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP;
3713 }
3714
3715 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
3716 struct net_device *dev = fib6_nh->fib_nh_dev;
3717
3718 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
3719 NL_SET_ERR_MSG(extack, "Invalid source address");
3720 err = -EINVAL;
3721 goto out;
3722 }
3723 rt->fib6_prefsrc.addr = cfg->fc_prefsrc;
3724 rt->fib6_prefsrc.plen = 128;
3725 } else
3726 rt->fib6_prefsrc.plen = 0;
3727
3728 return rt;
3729out:
3730 fib6_info_release(rt);
3731 return ERR_PTR(err);
3732}
3733
3734int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
3735 struct netlink_ext_ack *extack)
3736{
3737 struct fib6_info *rt;
3738 int err;
3739
3740 rt = ip6_route_info_create(cfg, gfp_flags, extack);
3741 if (IS_ERR(rt))
3742 return PTR_ERR(rt);
3743
3744 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack);
3745 fib6_info_release(rt);
3746
3747 return err;
3748}
3749
3750static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
3751{
3752 struct net *net = info->nl_net;
3753 struct fib6_table *table;
3754 int err;
3755
3756 if (rt == net->ipv6.fib6_null_entry) {
3757 err = -ENOENT;
3758 goto out;
3759 }
3760
3761 table = rt->fib6_table;
3762 spin_lock_bh(&table->tb6_lock);
3763 err = fib6_del(rt, info);
3764 spin_unlock_bh(&table->tb6_lock);
3765
3766out:
3767 fib6_info_release(rt);
3768 return err;
3769}
3770
3771int ip6_del_rt(struct net *net, struct fib6_info *rt, bool skip_notify)
3772{
3773 struct nl_info info = {
3774 .nl_net = net,
3775 .skip_notify = skip_notify
3776 };
3777
3778 return __ip6_del_rt(rt, &info);
3779}
3780
3781static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
3782{
3783 struct nl_info *info = &cfg->fc_nlinfo;
3784 struct net *net = info->nl_net;
3785 struct sk_buff *skb = NULL;
3786 struct fib6_table *table;
3787 int err = -ENOENT;
3788
3789 if (rt == net->ipv6.fib6_null_entry)
3790 goto out_put;
3791 table = rt->fib6_table;
3792 spin_lock_bh(&table->tb6_lock);
3793
3794 if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) {
3795 struct fib6_info *sibling, *next_sibling;
3796 struct fib6_node *fn;
3797
3798
3799 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3800 if (skb) {
3801 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3802
3803 if (rt6_fill_node(net, skb, rt, NULL,
3804 NULL, NULL, 0, RTM_DELROUTE,
3805 info->portid, seq, 0) < 0) {
3806 kfree_skb(skb);
3807 skb = NULL;
3808 } else
3809 info->skip_notify = 1;
3810 }
3811
3812
3813
3814
3815
3816
3817 info->skip_notify_kernel = 1;
3818 fn = rcu_dereference_protected(rt->fib6_node,
3819 lockdep_is_held(&table->tb6_lock));
3820 if (rcu_access_pointer(fn->leaf) == rt) {
3821 struct fib6_info *last_sibling, *replace_rt;
3822
3823 last_sibling = list_last_entry(&rt->fib6_siblings,
3824 struct fib6_info,
3825 fib6_siblings);
3826 replace_rt = rcu_dereference_protected(
3827 last_sibling->fib6_next,
3828 lockdep_is_held(&table->tb6_lock));
3829 if (replace_rt)
3830 call_fib6_entry_notifiers_replace(net,
3831 replace_rt);
3832 else
3833 call_fib6_multipath_entry_notifiers(net,
3834 FIB_EVENT_ENTRY_DEL,
3835 rt, rt->fib6_nsiblings,
3836 NULL);
3837 }
3838 list_for_each_entry_safe(sibling, next_sibling,
3839 &rt->fib6_siblings,
3840 fib6_siblings) {
3841 err = fib6_del(sibling, info);
3842 if (err)
3843 goto out_unlock;
3844 }
3845 }
3846
3847 err = fib6_del(rt, info);
3848out_unlock:
3849 spin_unlock_bh(&table->tb6_lock);
3850out_put:
3851 fib6_info_release(rt);
3852
3853 if (skb) {
3854 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3855 info->nlh, gfp_any());
3856 }
3857 return err;
3858}
3859
3860static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
3861{
3862 int rc = -ESRCH;
3863
3864 if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex)
3865 goto out;
3866
3867 if (cfg->fc_flags & RTF_GATEWAY &&
3868 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
3869 goto out;
3870
3871 rc = rt6_remove_exception_rt(rt);
3872out:
3873 return rc;
3874}
3875
3876static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt,
3877 struct fib6_nh *nh)
3878{
3879 struct fib6_result res = {
3880 .f6i = rt,
3881 .nh = nh,
3882 };
3883 struct rt6_info *rt_cache;
3884
3885 rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src);
3886 if (rt_cache)
3887 return __ip6_del_cached_rt(rt_cache, cfg);
3888
3889 return 0;
3890}
3891
3892struct fib6_nh_del_cached_rt_arg {
3893 struct fib6_config *cfg;
3894 struct fib6_info *f6i;
3895};
3896
3897static int fib6_nh_del_cached_rt(struct fib6_nh *nh, void *_arg)
3898{
3899 struct fib6_nh_del_cached_rt_arg *arg = _arg;
3900 int rc;
3901
3902 rc = ip6_del_cached_rt(arg->cfg, arg->f6i, nh);
3903 return rc != -ESRCH ? rc : 0;
3904}
3905
3906static int ip6_del_cached_rt_nh(struct fib6_config *cfg, struct fib6_info *f6i)
3907{
3908 struct fib6_nh_del_cached_rt_arg arg = {
3909 .cfg = cfg,
3910 .f6i = f6i
3911 };
3912
3913 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_del_cached_rt, &arg);
3914}
3915
3916static int ip6_route_del(struct fib6_config *cfg,
3917 struct netlink_ext_ack *extack)
3918{
3919 struct fib6_table *table;
3920 struct fib6_info *rt;
3921 struct fib6_node *fn;
3922 int err = -ESRCH;
3923
3924 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
3925 if (!table) {
3926 NL_SET_ERR_MSG(extack, "FIB table does not exist");
3927 return err;
3928 }
3929
3930 rcu_read_lock();
3931
3932 fn = fib6_locate(&table->tb6_root,
3933 &cfg->fc_dst, cfg->fc_dst_len,
3934 &cfg->fc_src, cfg->fc_src_len,
3935 !(cfg->fc_flags & RTF_CACHE));
3936
3937 if (fn) {
3938 for_each_fib6_node_rt_rcu(fn) {
3939 struct fib6_nh *nh;
3940
3941 if (rt->nh && cfg->fc_nh_id &&
3942 rt->nh->id != cfg->fc_nh_id)
3943 continue;
3944
3945 if (cfg->fc_flags & RTF_CACHE) {
3946 int rc = 0;
3947
3948 if (rt->nh) {
3949 rc = ip6_del_cached_rt_nh(cfg, rt);
3950 } else if (cfg->fc_nh_id) {
3951 continue;
3952 } else {
3953 nh = rt->fib6_nh;
3954 rc = ip6_del_cached_rt(cfg, rt, nh);
3955 }
3956 if (rc != -ESRCH) {
3957 rcu_read_unlock();
3958 return rc;
3959 }
3960 continue;
3961 }
3962
3963 if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric)
3964 continue;
3965 if (cfg->fc_protocol &&
3966 cfg->fc_protocol != rt->fib6_protocol)
3967 continue;
3968
3969 if (rt->nh) {
3970 if (!fib6_info_hold_safe(rt))
3971 continue;
3972 rcu_read_unlock();
3973
3974 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
3975 }
3976 if (cfg->fc_nh_id)
3977 continue;
3978
3979 nh = rt->fib6_nh;
3980 if (cfg->fc_ifindex &&
3981 (!nh->fib_nh_dev ||
3982 nh->fib_nh_dev->ifindex != cfg->fc_ifindex))
3983 continue;
3984 if (cfg->fc_flags & RTF_GATEWAY &&
3985 !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6))
3986 continue;
3987 if (!fib6_info_hold_safe(rt))
3988 continue;
3989 rcu_read_unlock();
3990
3991
3992 if (cfg->fc_flags & RTF_GATEWAY)
3993 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
3994
3995 return __ip6_del_rt_siblings(rt, cfg);
3996 }
3997 }
3998 rcu_read_unlock();
3999
4000 return err;
4001}
4002
4003static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
4004{
4005 struct netevent_redirect netevent;
4006 struct rt6_info *rt, *nrt = NULL;
4007 struct fib6_result res = {};
4008 struct ndisc_options ndopts;
4009 struct inet6_dev *in6_dev;
4010 struct neighbour *neigh;
4011 struct rd_msg *msg;
4012 int optlen, on_link;
4013 u8 *lladdr;
4014
4015 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
4016 optlen -= sizeof(*msg);
4017
4018 if (optlen < 0) {
4019 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
4020 return;
4021 }
4022
4023 msg = (struct rd_msg *)icmp6_hdr(skb);
4024
4025 if (ipv6_addr_is_multicast(&msg->dest)) {
4026 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
4027 return;
4028 }
4029
4030 on_link = 0;
4031 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
4032 on_link = 1;
4033 } else if (ipv6_addr_type(&msg->target) !=
4034 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
4035 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
4036 return;
4037 }
4038
4039 in6_dev = __in6_dev_get(skb->dev);
4040 if (!in6_dev)
4041 return;
4042 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
4043 return;
4044
4045
4046
4047
4048
4049
4050 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
4051 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
4052 return;
4053 }
4054
4055 lladdr = NULL;
4056 if (ndopts.nd_opts_tgt_lladdr) {
4057 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
4058 skb->dev);
4059 if (!lladdr) {
4060 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
4061 return;
4062 }
4063 }
4064
4065 rt = (struct rt6_info *) dst;
4066 if (rt->rt6i_flags & RTF_REJECT) {
4067 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
4068 return;
4069 }
4070
4071
4072
4073
4074
4075 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
4076
4077 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
4078 if (!neigh)
4079 return;
4080
4081
4082
4083
4084
4085 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
4086 NEIGH_UPDATE_F_WEAK_OVERRIDE|
4087 NEIGH_UPDATE_F_OVERRIDE|
4088 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
4089 NEIGH_UPDATE_F_ISROUTER)),
4090 NDISC_REDIRECT, &ndopts);
4091
4092 rcu_read_lock();
4093 res.f6i = rcu_dereference(rt->from);
4094 if (!res.f6i)
4095 goto out;
4096
4097 if (res.f6i->nh) {
4098 struct fib6_nh_match_arg arg = {
4099 .dev = dst->dev,
4100 .gw = &rt->rt6i_gateway,
4101 };
4102
4103 nexthop_for_each_fib6_nh(res.f6i->nh,
4104 fib6_nh_find_match, &arg);
4105
4106
4107
4108
4109 if (!arg.match)
4110 goto out;
4111 res.nh = arg.match;
4112 } else {
4113 res.nh = res.f6i->fib6_nh;
4114 }
4115
4116 res.fib6_flags = res.f6i->fib6_flags;
4117 res.fib6_type = res.f6i->fib6_type;
4118 nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL);
4119 if (!nrt)
4120 goto out;
4121
4122 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
4123 if (on_link)
4124 nrt->rt6i_flags &= ~RTF_GATEWAY;
4125
4126 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
4127
4128
4129 if (rt6_insert_exception(nrt, &res)) {
4130 dst_release_immediate(&nrt->dst);
4131 goto out;
4132 }
4133
4134 netevent.old = &rt->dst;
4135 netevent.new = &nrt->dst;
4136 netevent.daddr = &msg->dest;
4137 netevent.neigh = neigh;
4138 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
4139
4140out:
4141 rcu_read_unlock();
4142 neigh_release(neigh);
4143}
4144
4145#ifdef CONFIG_IPV6_ROUTE_INFO
4146static struct fib6_info *rt6_get_route_info(struct net *net,
4147 const struct in6_addr *prefix, int prefixlen,
4148 const struct in6_addr *gwaddr,
4149 struct net_device *dev)
4150{
4151 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
4152 int ifindex = dev->ifindex;
4153 struct fib6_node *fn;
4154 struct fib6_info *rt = NULL;
4155 struct fib6_table *table;
4156
4157 table = fib6_get_table(net, tb_id);
4158 if (!table)
4159 return NULL;
4160
4161 rcu_read_lock();
4162 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true);
4163 if (!fn)
4164 goto out;
4165
4166 for_each_fib6_node_rt_rcu(fn) {
4167
4168 if (rt->nh)
4169 continue;
4170 if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex)
4171 continue;
4172 if (!(rt->fib6_flags & RTF_ROUTEINFO) ||
4173 !rt->fib6_nh->fib_nh_gw_family)
4174 continue;
4175 if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr))
4176 continue;
4177 if (!fib6_info_hold_safe(rt))
4178 continue;
4179 break;
4180 }
4181out:
4182 rcu_read_unlock();
4183 return rt;
4184}
4185
4186static struct fib6_info *rt6_add_route_info(struct net *net,
4187 const struct in6_addr *prefix, int prefixlen,
4188 const struct in6_addr *gwaddr,
4189 struct net_device *dev,
4190 unsigned int pref)
4191{
4192 struct fib6_config cfg = {
4193 .fc_metric = IP6_RT_PRIO_USER,
4194 .fc_ifindex = dev->ifindex,
4195 .fc_dst_len = prefixlen,
4196 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
4197 RTF_UP | RTF_PREF(pref),
4198 .fc_protocol = RTPROT_RA,
4199 .fc_type = RTN_UNICAST,
4200 .fc_nlinfo.portid = 0,
4201 .fc_nlinfo.nlh = NULL,
4202 .fc_nlinfo.nl_net = net,
4203 };
4204
4205 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
4206 cfg.fc_dst = *prefix;
4207 cfg.fc_gateway = *gwaddr;
4208
4209
4210 if (!prefixlen)
4211 cfg.fc_flags |= RTF_DEFAULT;
4212
4213 ip6_route_add(&cfg, GFP_ATOMIC, NULL);
4214
4215 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
4216}
4217#endif
4218
4219struct fib6_info *rt6_get_dflt_router(struct net *net,
4220 const struct in6_addr *addr,
4221 struct net_device *dev)
4222{
4223 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
4224 struct fib6_info *rt;
4225 struct fib6_table *table;
4226
4227 table = fib6_get_table(net, tb_id);
4228 if (!table)
4229 return NULL;
4230
4231 rcu_read_lock();
4232 for_each_fib6_node_rt_rcu(&table->tb6_root) {
4233 struct fib6_nh *nh;
4234
4235
4236 if (rt->nh)
4237 continue;
4238
4239 nh = rt->fib6_nh;
4240 if (dev == nh->fib_nh_dev &&
4241 ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
4242 ipv6_addr_equal(&nh->fib_nh_gw6, addr))
4243 break;
4244 }
4245 if (rt && !fib6_info_hold_safe(rt))
4246 rt = NULL;
4247 rcu_read_unlock();
4248 return rt;
4249}
4250
4251struct fib6_info *rt6_add_dflt_router(struct net *net,
4252 const struct in6_addr *gwaddr,
4253 struct net_device *dev,
4254 unsigned int pref)
4255{
4256 struct fib6_config cfg = {
4257 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
4258 .fc_metric = IP6_RT_PRIO_USER,
4259 .fc_ifindex = dev->ifindex,
4260 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
4261 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
4262 .fc_protocol = RTPROT_RA,
4263 .fc_type = RTN_UNICAST,
4264 .fc_nlinfo.portid = 0,
4265 .fc_nlinfo.nlh = NULL,
4266 .fc_nlinfo.nl_net = net,
4267 };
4268
4269 cfg.fc_gateway = *gwaddr;
4270
4271 if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) {
4272 struct fib6_table *table;
4273
4274 table = fib6_get_table(dev_net(dev), cfg.fc_table);
4275 if (table)
4276 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
4277 }
4278
4279 return rt6_get_dflt_router(net, gwaddr, dev);
4280}
4281
4282static void __rt6_purge_dflt_routers(struct net *net,
4283 struct fib6_table *table)
4284{
4285 struct fib6_info *rt;
4286
4287restart:
4288 rcu_read_lock();
4289 for_each_fib6_node_rt_rcu(&table->tb6_root) {
4290 struct net_device *dev = fib6_info_nh_dev(rt);
4291 struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL;
4292
4293 if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
4294 (!idev || idev->cnf.accept_ra != 2) &&
4295 fib6_info_hold_safe(rt)) {
4296 rcu_read_unlock();
4297 ip6_del_rt(net, rt, false);
4298 goto restart;
4299 }
4300 }
4301 rcu_read_unlock();
4302
4303 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
4304}
4305
4306void rt6_purge_dflt_routers(struct net *net)
4307{
4308 struct fib6_table *table;
4309 struct hlist_head *head;
4310 unsigned int h;
4311
4312 rcu_read_lock();
4313
4314 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
4315 head = &net->ipv6.fib_table_hash[h];
4316 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
4317 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
4318 __rt6_purge_dflt_routers(net, table);
4319 }
4320 }
4321
4322 rcu_read_unlock();
4323}
4324
4325static void rtmsg_to_fib6_config(struct net *net,
4326 struct in6_rtmsg *rtmsg,
4327 struct fib6_config *cfg)
4328{
4329 *cfg = (struct fib6_config){
4330 .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
4331 : RT6_TABLE_MAIN,
4332 .fc_ifindex = rtmsg->rtmsg_ifindex,
4333 .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER,
4334 .fc_expires = rtmsg->rtmsg_info,
4335 .fc_dst_len = rtmsg->rtmsg_dst_len,
4336 .fc_src_len = rtmsg->rtmsg_src_len,
4337 .fc_flags = rtmsg->rtmsg_flags,
4338 .fc_type = rtmsg->rtmsg_type,
4339
4340 .fc_nlinfo.nl_net = net,
4341
4342 .fc_dst = rtmsg->rtmsg_dst,
4343 .fc_src = rtmsg->rtmsg_src,
4344 .fc_gateway = rtmsg->rtmsg_gateway,
4345 };
4346}
4347
4348int ipv6_route_ioctl(struct net *net, unsigned int cmd, struct in6_rtmsg *rtmsg)
4349{
4350 struct fib6_config cfg;
4351 int err;
4352
4353 if (cmd != SIOCADDRT && cmd != SIOCDELRT)
4354 return -EINVAL;
4355 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4356 return -EPERM;
4357
4358 rtmsg_to_fib6_config(net, rtmsg, &cfg);
4359
4360 rtnl_lock();
4361 switch (cmd) {
4362 case SIOCADDRT:
4363 err = ip6_route_add(&cfg, GFP_KERNEL, NULL);
4364 break;
4365 case SIOCDELRT:
4366 err = ip6_route_del(&cfg, NULL);
4367 break;
4368 }
4369 rtnl_unlock();
4370 return err;
4371}
4372
4373
4374
4375
4376
4377static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
4378{
4379 struct dst_entry *dst = skb_dst(skb);
4380 struct net *net = dev_net(dst->dev);
4381 struct inet6_dev *idev;
4382 int type;
4383
4384 if (netif_is_l3_master(skb->dev) &&
4385 dst->dev == net->loopback_dev)
4386 idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif));
4387 else
4388 idev = ip6_dst_idev(dst);
4389
4390 switch (ipstats_mib_noroutes) {
4391 case IPSTATS_MIB_INNOROUTES:
4392 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
4393 if (type == IPV6_ADDR_ANY) {
4394 IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
4395 break;
4396 }
4397 fallthrough;
4398 case IPSTATS_MIB_OUTNOROUTES:
4399 IP6_INC_STATS(net, idev, ipstats_mib_noroutes);
4400 break;
4401 }
4402
4403
4404 if (netif_is_l3_master(skb->dev))
4405 skb_dst_drop(skb);
4406
4407 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
4408 kfree_skb(skb);
4409 return 0;
4410}
4411
4412static int ip6_pkt_discard(struct sk_buff *skb)
4413{
4414 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
4415}
4416
4417static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
4418{
4419 skb->dev = skb_dst(skb)->dev;
4420 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
4421}
4422
4423static int ip6_pkt_prohibit(struct sk_buff *skb)
4424{
4425 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
4426}
4427
4428static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
4429{
4430 skb->dev = skb_dst(skb)->dev;
4431 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
4432}
4433
4434
4435
4436
4437
4438struct fib6_info *addrconf_f6i_alloc(struct net *net,
4439 struct inet6_dev *idev,
4440 const struct in6_addr *addr,
4441 bool anycast, gfp_t gfp_flags)
4442{
4443 struct fib6_config cfg = {
4444 .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL,
4445 .fc_ifindex = idev->dev->ifindex,
4446 .fc_flags = RTF_UP | RTF_NONEXTHOP,
4447 .fc_dst = *addr,
4448 .fc_dst_len = 128,
4449 .fc_protocol = RTPROT_KERNEL,
4450 .fc_nlinfo.nl_net = net,
4451 .fc_ignore_dev_down = true,
4452 };
4453 struct fib6_info *f6i;
4454
4455 if (anycast) {
4456 cfg.fc_type = RTN_ANYCAST;
4457 cfg.fc_flags |= RTF_ANYCAST;
4458 } else {
4459 cfg.fc_type = RTN_LOCAL;
4460 cfg.fc_flags |= RTF_LOCAL;
4461 }
4462
4463 f6i = ip6_route_info_create(&cfg, gfp_flags, NULL);
4464 if (!IS_ERR(f6i))
4465 f6i->dst_nocount = true;
4466 return f6i;
4467}
4468
4469
4470struct arg_dev_net_ip {
4471 struct net_device *dev;
4472 struct net *net;
4473 struct in6_addr *addr;
4474};
4475
4476static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg)
4477{
4478 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
4479 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
4480 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
4481
4482 if (!rt->nh &&
4483 ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) &&
4484 rt != net->ipv6.fib6_null_entry &&
4485 ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) {
4486 spin_lock_bh(&rt6_exception_lock);
4487
4488 rt->fib6_prefsrc.plen = 0;
4489 spin_unlock_bh(&rt6_exception_lock);
4490 }
4491 return 0;
4492}
4493
4494void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
4495{
4496 struct net *net = dev_net(ifp->idev->dev);
4497 struct arg_dev_net_ip adni = {
4498 .dev = ifp->idev->dev,
4499 .net = net,
4500 .addr = &ifp->addr,
4501 };
4502 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
4503}
4504
4505#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT)
4506
4507
4508static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
4509{
4510 struct in6_addr *gateway = (struct in6_addr *)arg;
4511 struct fib6_nh *nh;
4512
4513
4514 if (rt->nh)
4515 return 0;
4516
4517 nh = rt->fib6_nh;
4518 if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
4519 nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6))
4520 return -1;
4521
4522
4523
4524
4525
4526 fib6_nh_exceptions_clean_tohost(nh, gateway);
4527
4528 return 0;
4529}
4530
4531void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
4532{
4533 fib6_clean_all(net, fib6_clean_tohost, gateway);
4534}
4535
4536struct arg_netdev_event {
4537 const struct net_device *dev;
4538 union {
4539 unsigned char nh_flags;
4540 unsigned long event;
4541 };
4542};
4543
4544static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt)
4545{
4546 struct fib6_info *iter;
4547 struct fib6_node *fn;
4548
4549 fn = rcu_dereference_protected(rt->fib6_node,
4550 lockdep_is_held(&rt->fib6_table->tb6_lock));
4551 iter = rcu_dereference_protected(fn->leaf,
4552 lockdep_is_held(&rt->fib6_table->tb6_lock));
4553 while (iter) {
4554 if (iter->fib6_metric == rt->fib6_metric &&
4555 rt6_qualify_for_ecmp(iter))
4556 return iter;
4557 iter = rcu_dereference_protected(iter->fib6_next,
4558 lockdep_is_held(&rt->fib6_table->tb6_lock));
4559 }
4560
4561 return NULL;
4562}
4563
4564
4565static bool rt6_is_dead(const struct fib6_info *rt)
4566{
4567 if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD ||
4568 (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN &&
4569 ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev)))
4570 return true;
4571
4572 return false;
4573}
4574
4575static int rt6_multipath_total_weight(const struct fib6_info *rt)
4576{
4577 struct fib6_info *iter;
4578 int total = 0;
4579
4580 if (!rt6_is_dead(rt))
4581 total += rt->fib6_nh->fib_nh_weight;
4582
4583 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
4584 if (!rt6_is_dead(iter))
4585 total += iter->fib6_nh->fib_nh_weight;
4586 }
4587
4588 return total;
4589}
4590
4591static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total)
4592{
4593 int upper_bound = -1;
4594
4595 if (!rt6_is_dead(rt)) {
4596 *weight += rt->fib6_nh->fib_nh_weight;
4597 upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
4598 total) - 1;
4599 }
4600 atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound);
4601}
4602
4603static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total)
4604{
4605 struct fib6_info *iter;
4606 int weight = 0;
4607
4608 rt6_upper_bound_set(rt, &weight, total);
4609
4610 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4611 rt6_upper_bound_set(iter, &weight, total);
4612}
4613
4614void rt6_multipath_rebalance(struct fib6_info *rt)
4615{
4616 struct fib6_info *first;
4617 int total;
4618
4619
4620
4621
4622
4623 if (!rt->fib6_nsiblings || rt->should_flush)
4624 return;
4625
4626
4627
4628
4629
4630 first = rt6_multipath_first_sibling(rt);
4631 if (WARN_ON_ONCE(!first))
4632 return;
4633
4634 total = rt6_multipath_total_weight(first);
4635 rt6_multipath_upper_bound_set(first, total);
4636}
4637
4638static int fib6_ifup(struct fib6_info *rt, void *p_arg)
4639{
4640 const struct arg_netdev_event *arg = p_arg;
4641 struct net *net = dev_net(arg->dev);
4642
4643 if (rt != net->ipv6.fib6_null_entry && !rt->nh &&
4644 rt->fib6_nh->fib_nh_dev == arg->dev) {
4645 rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags;
4646 fib6_update_sernum_upto_root(net, rt);
4647 rt6_multipath_rebalance(rt);
4648 }
4649
4650 return 0;
4651}
4652
4653void rt6_sync_up(struct net_device *dev, unsigned char nh_flags)
4654{
4655 struct arg_netdev_event arg = {
4656 .dev = dev,
4657 {
4658 .nh_flags = nh_flags,
4659 },
4660 };
4661
4662 if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev))
4663 arg.nh_flags |= RTNH_F_LINKDOWN;
4664
4665 fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
4666}
4667
4668
4669static bool rt6_multipath_uses_dev(const struct fib6_info *rt,
4670 const struct net_device *dev)
4671{
4672 struct fib6_info *iter;
4673
4674 if (rt->fib6_nh->fib_nh_dev == dev)
4675 return true;
4676 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4677 if (iter->fib6_nh->fib_nh_dev == dev)
4678 return true;
4679
4680 return false;
4681}
4682
4683static void rt6_multipath_flush(struct fib6_info *rt)
4684{
4685 struct fib6_info *iter;
4686
4687 rt->should_flush = 1;
4688 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4689 iter->should_flush = 1;
4690}
4691
4692static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
4693 const struct net_device *down_dev)
4694{
4695 struct fib6_info *iter;
4696 unsigned int dead = 0;
4697
4698 if (rt->fib6_nh->fib_nh_dev == down_dev ||
4699 rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
4700 dead++;
4701 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4702 if (iter->fib6_nh->fib_nh_dev == down_dev ||
4703 iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
4704 dead++;
4705
4706 return dead;
4707}
4708
4709static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
4710 const struct net_device *dev,
4711 unsigned char nh_flags)
4712{
4713 struct fib6_info *iter;
4714
4715 if (rt->fib6_nh->fib_nh_dev == dev)
4716 rt->fib6_nh->fib_nh_flags |= nh_flags;
4717 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4718 if (iter->fib6_nh->fib_nh_dev == dev)
4719 iter->fib6_nh->fib_nh_flags |= nh_flags;
4720}
4721
4722
4723static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
4724{
4725 const struct arg_netdev_event *arg = p_arg;
4726 const struct net_device *dev = arg->dev;
4727 struct net *net = dev_net(dev);
4728
4729 if (rt == net->ipv6.fib6_null_entry || rt->nh)
4730 return 0;
4731
4732 switch (arg->event) {
4733 case NETDEV_UNREGISTER:
4734 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
4735 case NETDEV_DOWN:
4736 if (rt->should_flush)
4737 return -1;
4738 if (!rt->fib6_nsiblings)
4739 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
4740 if (rt6_multipath_uses_dev(rt, dev)) {
4741 unsigned int count;
4742
4743 count = rt6_multipath_dead_count(rt, dev);
4744 if (rt->fib6_nsiblings + 1 == count) {
4745 rt6_multipath_flush(rt);
4746 return -1;
4747 }
4748 rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD |
4749 RTNH_F_LINKDOWN);
4750 fib6_update_sernum(net, rt);
4751 rt6_multipath_rebalance(rt);
4752 }
4753 return -2;
4754 case NETDEV_CHANGE:
4755 if (rt->fib6_nh->fib_nh_dev != dev ||
4756 rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST))
4757 break;
4758 rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
4759 rt6_multipath_rebalance(rt);
4760 break;
4761 }
4762
4763 return 0;
4764}
4765
4766void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
4767{
4768 struct arg_netdev_event arg = {
4769 .dev = dev,
4770 {
4771 .event = event,
4772 },
4773 };
4774 struct net *net = dev_net(dev);
4775
4776 if (net->ipv6.sysctl.skip_notify_on_dev_down)
4777 fib6_clean_all_skip_notify(net, fib6_ifdown, &arg);
4778 else
4779 fib6_clean_all(net, fib6_ifdown, &arg);
4780}
4781
4782void rt6_disable_ip(struct net_device *dev, unsigned long event)
4783{
4784 rt6_sync_down_dev(dev, event);
4785 rt6_uncached_list_flush_dev(dev_net(dev), dev);
4786 neigh_ifdown(&nd_tbl, dev);
4787}
4788
4789struct rt6_mtu_change_arg {
4790 struct net_device *dev;
4791 unsigned int mtu;
4792 struct fib6_info *f6i;
4793};
4794
4795static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg)
4796{
4797 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg;
4798 struct fib6_info *f6i = arg->f6i;
4799
4800
4801
4802
4803
4804
4805 if (nh->fib_nh_dev == arg->dev) {
4806 struct inet6_dev *idev = __in6_dev_get(arg->dev);
4807 u32 mtu = f6i->fib6_pmtu;
4808
4809 if (mtu >= arg->mtu ||
4810 (mtu < arg->mtu && mtu == idev->cnf.mtu6))
4811 fib6_metric_set(f6i, RTAX_MTU, arg->mtu);
4812
4813 spin_lock_bh(&rt6_exception_lock);
4814 rt6_exceptions_update_pmtu(idev, nh, arg->mtu);
4815 spin_unlock_bh(&rt6_exception_lock);
4816 }
4817
4818 return 0;
4819}
4820
4821static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg)
4822{
4823 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
4824 struct inet6_dev *idev;
4825
4826
4827
4828
4829
4830
4831
4832 idev = __in6_dev_get(arg->dev);
4833 if (!idev)
4834 return 0;
4835
4836 if (fib6_metric_locked(f6i, RTAX_MTU))
4837 return 0;
4838
4839 arg->f6i = f6i;
4840 if (f6i->nh) {
4841
4842 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_mtu_change,
4843 arg);
4844 }
4845
4846 return fib6_nh_mtu_change(f6i->fib6_nh, arg);
4847}
4848
4849void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
4850{
4851 struct rt6_mtu_change_arg arg = {
4852 .dev = dev,
4853 .mtu = mtu,
4854 };
4855
4856 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
4857}
4858
4859static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
4860 [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 },
4861 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
4862 [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) },
4863 [RTA_OIF] = { .type = NLA_U32 },
4864 [RTA_IIF] = { .type = NLA_U32 },
4865 [RTA_PRIORITY] = { .type = NLA_U32 },
4866 [RTA_METRICS] = { .type = NLA_NESTED },
4867 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
4868 [RTA_PREF] = { .type = NLA_U8 },
4869 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
4870 [RTA_ENCAP] = { .type = NLA_NESTED },
4871 [RTA_EXPIRES] = { .type = NLA_U32 },
4872 [RTA_UID] = { .type = NLA_U32 },
4873 [RTA_MARK] = { .type = NLA_U32 },
4874 [RTA_TABLE] = { .type = NLA_U32 },
4875 [RTA_IP_PROTO] = { .type = NLA_U8 },
4876 [RTA_SPORT] = { .type = NLA_U16 },
4877 [RTA_DPORT] = { .type = NLA_U16 },
4878 [RTA_NH_ID] = { .type = NLA_U32 },
4879};
4880
4881static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
4882 struct fib6_config *cfg,
4883 struct netlink_ext_ack *extack)
4884{
4885 struct rtmsg *rtm;
4886 struct nlattr *tb[RTA_MAX+1];
4887 unsigned int pref;
4888 int err;
4889
4890 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
4891 rtm_ipv6_policy, extack);
4892 if (err < 0)
4893 goto errout;
4894
4895 err = -EINVAL;
4896 rtm = nlmsg_data(nlh);
4897
4898 *cfg = (struct fib6_config){
4899 .fc_table = rtm->rtm_table,
4900 .fc_dst_len = rtm->rtm_dst_len,
4901 .fc_src_len = rtm->rtm_src_len,
4902 .fc_flags = RTF_UP,
4903 .fc_protocol = rtm->rtm_protocol,
4904 .fc_type = rtm->rtm_type,
4905
4906 .fc_nlinfo.portid = NETLINK_CB(skb).portid,
4907 .fc_nlinfo.nlh = nlh,
4908 .fc_nlinfo.nl_net = sock_net(skb->sk),
4909 };
4910
4911 if (rtm->rtm_type == RTN_UNREACHABLE ||
4912 rtm->rtm_type == RTN_BLACKHOLE ||
4913 rtm->rtm_type == RTN_PROHIBIT ||
4914 rtm->rtm_type == RTN_THROW)
4915 cfg->fc_flags |= RTF_REJECT;
4916
4917 if (rtm->rtm_type == RTN_LOCAL)
4918 cfg->fc_flags |= RTF_LOCAL;
4919
4920 if (rtm->rtm_flags & RTM_F_CLONED)
4921 cfg->fc_flags |= RTF_CACHE;
4922
4923 cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK);
4924
4925 if (tb[RTA_NH_ID]) {
4926 if (tb[RTA_GATEWAY] || tb[RTA_OIF] ||
4927 tb[RTA_MULTIPATH] || tb[RTA_ENCAP]) {
4928 NL_SET_ERR_MSG(extack,
4929 "Nexthop specification and nexthop id are mutually exclusive");
4930 goto errout;
4931 }
4932 cfg->fc_nh_id = nla_get_u32(tb[RTA_NH_ID]);
4933 }
4934
4935 if (tb[RTA_GATEWAY]) {
4936 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
4937 cfg->fc_flags |= RTF_GATEWAY;
4938 }
4939 if (tb[RTA_VIA]) {
4940 NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute");
4941 goto errout;
4942 }
4943
4944 if (tb[RTA_DST]) {
4945 int plen = (rtm->rtm_dst_len + 7) >> 3;
4946
4947 if (nla_len(tb[RTA_DST]) < plen)
4948 goto errout;
4949
4950 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
4951 }
4952
4953 if (tb[RTA_SRC]) {
4954 int plen = (rtm->rtm_src_len + 7) >> 3;
4955
4956 if (nla_len(tb[RTA_SRC]) < plen)
4957 goto errout;
4958
4959 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
4960 }
4961
4962 if (tb[RTA_PREFSRC])
4963 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
4964
4965 if (tb[RTA_OIF])
4966 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
4967
4968 if (tb[RTA_PRIORITY])
4969 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
4970
4971 if (tb[RTA_METRICS]) {
4972 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
4973 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
4974 }
4975
4976 if (tb[RTA_TABLE])
4977 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
4978
4979 if (tb[RTA_MULTIPATH]) {
4980 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
4981 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
4982
4983 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
4984 cfg->fc_mp_len, extack);
4985 if (err < 0)
4986 goto errout;
4987 }
4988
4989 if (tb[RTA_PREF]) {
4990 pref = nla_get_u8(tb[RTA_PREF]);
4991 if (pref != ICMPV6_ROUTER_PREF_LOW &&
4992 pref != ICMPV6_ROUTER_PREF_HIGH)
4993 pref = ICMPV6_ROUTER_PREF_MEDIUM;
4994 cfg->fc_flags |= RTF_PREF(pref);
4995 }
4996
4997 if (tb[RTA_ENCAP])
4998 cfg->fc_encap = tb[RTA_ENCAP];
4999
5000 if (tb[RTA_ENCAP_TYPE]) {
5001 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
5002
5003 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
5004 if (err < 0)
5005 goto errout;
5006 }
5007
5008 if (tb[RTA_EXPIRES]) {
5009 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
5010
5011 if (addrconf_finite_timeout(timeout)) {
5012 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
5013 cfg->fc_flags |= RTF_EXPIRES;
5014 }
5015 }
5016
5017 err = 0;
5018errout:
5019 return err;
5020}
5021
5022struct rt6_nh {
5023 struct fib6_info *fib6_info;
5024 struct fib6_config r_cfg;
5025 struct list_head next;
5026};
5027
5028static int ip6_route_info_append(struct net *net,
5029 struct list_head *rt6_nh_list,
5030 struct fib6_info *rt,
5031 struct fib6_config *r_cfg)
5032{
5033 struct rt6_nh *nh;
5034 int err = -EEXIST;
5035
5036 list_for_each_entry(nh, rt6_nh_list, next) {
5037
5038 if (rt6_duplicate_nexthop(nh->fib6_info, rt))
5039 return err;
5040 }
5041
5042 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
5043 if (!nh)
5044 return -ENOMEM;
5045 nh->fib6_info = rt;
5046 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
5047 list_add_tail(&nh->next, rt6_nh_list);
5048
5049 return 0;
5050}
5051
5052static void ip6_route_mpath_notify(struct fib6_info *rt,
5053 struct fib6_info *rt_last,
5054 struct nl_info *info,
5055 __u16 nlflags)
5056{
5057
5058
5059
5060
5061
5062
5063 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) {
5064 rt = list_first_entry(&rt_last->fib6_siblings,
5065 struct fib6_info,
5066 fib6_siblings);
5067 }
5068
5069 if (rt)
5070 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
5071}
5072
5073static bool ip6_route_mpath_should_notify(const struct fib6_info *rt)
5074{
5075 bool rt_can_ecmp = rt6_qualify_for_ecmp(rt);
5076 bool should_notify = false;
5077 struct fib6_info *leaf;
5078 struct fib6_node *fn;
5079
5080 rcu_read_lock();
5081 fn = rcu_dereference(rt->fib6_node);
5082 if (!fn)
5083 goto out;
5084
5085 leaf = rcu_dereference(fn->leaf);
5086 if (!leaf)
5087 goto out;
5088
5089 if (rt == leaf ||
5090 (rt_can_ecmp && rt->fib6_metric == leaf->fib6_metric &&
5091 rt6_qualify_for_ecmp(leaf)))
5092 should_notify = true;
5093out:
5094 rcu_read_unlock();
5095
5096 return should_notify;
5097}
5098
5099static int ip6_route_multipath_add(struct fib6_config *cfg,
5100 struct netlink_ext_ack *extack)
5101{
5102 struct fib6_info *rt_notif = NULL, *rt_last = NULL;
5103 struct nl_info *info = &cfg->fc_nlinfo;
5104 struct fib6_config r_cfg;
5105 struct rtnexthop *rtnh;
5106 struct fib6_info *rt;
5107 struct rt6_nh *err_nh;
5108 struct rt6_nh *nh, *nh_safe;
5109 __u16 nlflags;
5110 int remaining;
5111 int attrlen;
5112 int err = 1;
5113 int nhn = 0;
5114 int replace = (cfg->fc_nlinfo.nlh &&
5115 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
5116 LIST_HEAD(rt6_nh_list);
5117
5118 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
5119 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
5120 nlflags |= NLM_F_APPEND;
5121
5122 remaining = cfg->fc_mp_len;
5123 rtnh = (struct rtnexthop *)cfg->fc_mp;
5124
5125
5126
5127
5128 while (rtnh_ok(rtnh, remaining)) {
5129 memcpy(&r_cfg, cfg, sizeof(*cfg));
5130 if (rtnh->rtnh_ifindex)
5131 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5132
5133 attrlen = rtnh_attrlen(rtnh);
5134 if (attrlen > 0) {
5135 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5136
5137 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5138 if (nla) {
5139 r_cfg.fc_gateway = nla_get_in6_addr(nla);
5140 r_cfg.fc_flags |= RTF_GATEWAY;
5141 }
5142 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
5143 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
5144 if (nla)
5145 r_cfg.fc_encap_type = nla_get_u16(nla);
5146 }
5147
5148 r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK);
5149 rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack);
5150 if (IS_ERR(rt)) {
5151 err = PTR_ERR(rt);
5152 rt = NULL;
5153 goto cleanup;
5154 }
5155 if (!rt6_qualify_for_ecmp(rt)) {
5156 err = -EINVAL;
5157 NL_SET_ERR_MSG(extack,
5158 "Device only routes can not be added for IPv6 using the multipath API.");
5159 fib6_info_release(rt);
5160 goto cleanup;
5161 }
5162
5163 rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1;
5164
5165 err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
5166 rt, &r_cfg);
5167 if (err) {
5168 fib6_info_release(rt);
5169 goto cleanup;
5170 }
5171
5172 rtnh = rtnh_next(rtnh, &remaining);
5173 }
5174
5175 if (list_empty(&rt6_nh_list)) {
5176 NL_SET_ERR_MSG(extack,
5177 "Invalid nexthop configuration - no valid nexthops");
5178 return -EINVAL;
5179 }
5180
5181
5182
5183
5184
5185 info->skip_notify = 1;
5186
5187
5188
5189
5190 info->skip_notify_kernel = 1;
5191
5192 err_nh = NULL;
5193 list_for_each_entry(nh, &rt6_nh_list, next) {
5194 err = __ip6_ins_rt(nh->fib6_info, info, extack);
5195 fib6_info_release(nh->fib6_info);
5196
5197 if (!err) {
5198
5199 rt_last = nh->fib6_info;
5200
5201
5202 if (!rt_notif)
5203 rt_notif = nh->fib6_info;
5204 }
5205
5206
5207 nh->fib6_info = NULL;
5208 if (err) {
5209 if (replace && nhn)
5210 NL_SET_ERR_MSG_MOD(extack,
5211 "multipath route replace failed (check consistency of installed routes)");
5212 err_nh = nh;
5213 goto add_errout;
5214 }
5215
5216
5217
5218
5219
5220
5221
5222
5223 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
5224 NLM_F_REPLACE);
5225 cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE;
5226 nhn++;
5227 }
5228
5229
5230
5231
5232
5233
5234 if (ip6_route_mpath_should_notify(rt_notif)) {
5235 enum fib_event_type fib_event;
5236
5237 if (rt_notif->fib6_nsiblings != nhn - 1)
5238 fib_event = FIB_EVENT_ENTRY_APPEND;
5239 else
5240 fib_event = FIB_EVENT_ENTRY_REPLACE;
5241
5242 err = call_fib6_multipath_entry_notifiers(info->nl_net,
5243 fib_event, rt_notif,
5244 nhn - 1, extack);
5245 if (err) {
5246
5247 err_nh = NULL;
5248 goto add_errout;
5249 }
5250 }
5251
5252
5253 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
5254 goto cleanup;
5255
5256add_errout:
5257
5258
5259
5260
5261 if (rt_notif)
5262 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
5263
5264
5265 list_for_each_entry(nh, &rt6_nh_list, next) {
5266 if (err_nh == nh)
5267 break;
5268 ip6_route_del(&nh->r_cfg, extack);
5269 }
5270
5271cleanup:
5272 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
5273 if (nh->fib6_info)
5274 fib6_info_release(nh->fib6_info);
5275 list_del(&nh->next);
5276 kfree(nh);
5277 }
5278
5279 return err;
5280}
5281
5282static int ip6_route_multipath_del(struct fib6_config *cfg,
5283 struct netlink_ext_ack *extack)
5284{
5285 struct fib6_config r_cfg;
5286 struct rtnexthop *rtnh;
5287 int remaining;
5288 int attrlen;
5289 int err = 1, last_err = 0;
5290
5291 remaining = cfg->fc_mp_len;
5292 rtnh = (struct rtnexthop *)cfg->fc_mp;
5293
5294
5295 while (rtnh_ok(rtnh, remaining)) {
5296 memcpy(&r_cfg, cfg, sizeof(*cfg));
5297 if (rtnh->rtnh_ifindex)
5298 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5299
5300 attrlen = rtnh_attrlen(rtnh);
5301 if (attrlen > 0) {
5302 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5303
5304 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5305 if (nla) {
5306 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
5307 r_cfg.fc_flags |= RTF_GATEWAY;
5308 }
5309 }
5310 err = ip6_route_del(&r_cfg, extack);
5311 if (err)
5312 last_err = err;
5313
5314 rtnh = rtnh_next(rtnh, &remaining);
5315 }
5316
5317 return last_err;
5318}
5319
5320static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5321 struct netlink_ext_ack *extack)
5322{
5323 struct fib6_config cfg;
5324 int err;
5325
5326 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
5327 if (err < 0)
5328 return err;
5329
5330 if (cfg.fc_nh_id &&
5331 !nexthop_find_by_id(sock_net(skb->sk), cfg.fc_nh_id)) {
5332 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
5333 return -EINVAL;
5334 }
5335
5336 if (cfg.fc_mp)
5337 return ip6_route_multipath_del(&cfg, extack);
5338 else {
5339 cfg.fc_delete_all_nh = 1;
5340 return ip6_route_del(&cfg, extack);
5341 }
5342}
5343
5344static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5345 struct netlink_ext_ack *extack)
5346{
5347 struct fib6_config cfg;
5348 int err;
5349
5350 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
5351 if (err < 0)
5352 return err;
5353
5354 if (cfg.fc_metric == 0)
5355 cfg.fc_metric = IP6_RT_PRIO_USER;
5356
5357 if (cfg.fc_mp)
5358 return ip6_route_multipath_add(&cfg, extack);
5359 else
5360 return ip6_route_add(&cfg, GFP_KERNEL, extack);
5361}
5362
5363
5364static int rt6_nh_nlmsg_size(struct fib6_nh *nh, void *arg)
5365{
5366 int *nexthop_len = arg;
5367
5368 *nexthop_len += nla_total_size(0)
5369 + NLA_ALIGN(sizeof(struct rtnexthop))
5370 + nla_total_size(16);
5371
5372 if (nh->fib_nh_lws) {
5373
5374 *nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
5375
5376 *nexthop_len += nla_total_size(2);
5377 }
5378
5379 return 0;
5380}
5381
5382static size_t rt6_nlmsg_size(struct fib6_info *f6i)
5383{
5384 int nexthop_len;
5385
5386 if (f6i->nh) {
5387 nexthop_len = nla_total_size(4);
5388 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_nlmsg_size,
5389 &nexthop_len);
5390 } else {
5391 struct fib6_nh *nh = f6i->fib6_nh;
5392
5393 nexthop_len = 0;
5394 if (f6i->fib6_nsiblings) {
5395 nexthop_len = nla_total_size(0)
5396 + NLA_ALIGN(sizeof(struct rtnexthop))
5397 + nla_total_size(16)
5398 + lwtunnel_get_encap_size(nh->fib_nh_lws);
5399
5400 nexthop_len *= f6i->fib6_nsiblings;
5401 }
5402 nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
5403 }
5404
5405 return NLMSG_ALIGN(sizeof(struct rtmsg))
5406 + nla_total_size(16)
5407 + nla_total_size(16)
5408 + nla_total_size(16)
5409 + nla_total_size(16)
5410 + nla_total_size(4)
5411 + nla_total_size(4)
5412 + nla_total_size(4)
5413 + nla_total_size(4)
5414 + RTAX_MAX * nla_total_size(4)
5415 + nla_total_size(sizeof(struct rta_cacheinfo))
5416 + nla_total_size(TCP_CA_NAME_MAX)
5417 + nla_total_size(1)
5418 + nexthop_len;
5419}
5420
5421static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh,
5422 unsigned char *flags)
5423{
5424 if (nexthop_is_multipath(nh)) {
5425 struct nlattr *mp;
5426
5427 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
5428 if (!mp)
5429 goto nla_put_failure;
5430
5431 if (nexthop_mpath_fill_node(skb, nh, AF_INET6))
5432 goto nla_put_failure;
5433
5434 nla_nest_end(skb, mp);
5435 } else {
5436 struct fib6_nh *fib6_nh;
5437
5438 fib6_nh = nexthop_fib6_nh(nh);
5439 if (fib_nexthop_info(skb, &fib6_nh->nh_common, AF_INET6,
5440 flags, false) < 0)
5441 goto nla_put_failure;
5442 }
5443
5444 return 0;
5445
5446nla_put_failure:
5447 return -EMSGSIZE;
5448}
5449
5450static int rt6_fill_node(struct net *net, struct sk_buff *skb,
5451 struct fib6_info *rt, struct dst_entry *dst,
5452 struct in6_addr *dest, struct in6_addr *src,
5453 int iif, int type, u32 portid, u32 seq,
5454 unsigned int flags)
5455{
5456 struct rt6_info *rt6 = (struct rt6_info *)dst;
5457 struct rt6key *rt6_dst, *rt6_src;
5458 u32 *pmetrics, table, rt6_flags;
5459 unsigned char nh_flags = 0;
5460 struct nlmsghdr *nlh;
5461 struct rtmsg *rtm;
5462 long expires = 0;
5463
5464 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
5465 if (!nlh)
5466 return -EMSGSIZE;
5467
5468 if (rt6) {
5469 rt6_dst = &rt6->rt6i_dst;
5470 rt6_src = &rt6->rt6i_src;
5471 rt6_flags = rt6->rt6i_flags;
5472 } else {
5473 rt6_dst = &rt->fib6_dst;
5474 rt6_src = &rt->fib6_src;
5475 rt6_flags = rt->fib6_flags;
5476 }
5477
5478 rtm = nlmsg_data(nlh);
5479 rtm->rtm_family = AF_INET6;
5480 rtm->rtm_dst_len = rt6_dst->plen;
5481 rtm->rtm_src_len = rt6_src->plen;
5482 rtm->rtm_tos = 0;
5483 if (rt->fib6_table)
5484 table = rt->fib6_table->tb6_id;
5485 else
5486 table = RT6_TABLE_UNSPEC;
5487 rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT;
5488 if (nla_put_u32(skb, RTA_TABLE, table))
5489 goto nla_put_failure;
5490
5491 rtm->rtm_type = rt->fib6_type;
5492 rtm->rtm_flags = 0;
5493 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
5494 rtm->rtm_protocol = rt->fib6_protocol;
5495
5496 if (rt6_flags & RTF_CACHE)
5497 rtm->rtm_flags |= RTM_F_CLONED;
5498
5499 if (dest) {
5500 if (nla_put_in6_addr(skb, RTA_DST, dest))
5501 goto nla_put_failure;
5502 rtm->rtm_dst_len = 128;
5503 } else if (rtm->rtm_dst_len)
5504 if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr))
5505 goto nla_put_failure;
5506#ifdef CONFIG_IPV6_SUBTREES
5507 if (src) {
5508 if (nla_put_in6_addr(skb, RTA_SRC, src))
5509 goto nla_put_failure;
5510 rtm->rtm_src_len = 128;
5511 } else if (rtm->rtm_src_len &&
5512 nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr))
5513 goto nla_put_failure;
5514#endif
5515 if (iif) {
5516#ifdef CONFIG_IPV6_MROUTE
5517 if (ipv6_addr_is_multicast(&rt6_dst->addr)) {
5518 int err = ip6mr_get_route(net, skb, rtm, portid);
5519
5520 if (err == 0)
5521 return 0;
5522 if (err < 0)
5523 goto nla_put_failure;
5524 } else
5525#endif
5526 if (nla_put_u32(skb, RTA_IIF, iif))
5527 goto nla_put_failure;
5528 } else if (dest) {
5529 struct in6_addr saddr_buf;
5530 if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 &&
5531 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
5532 goto nla_put_failure;
5533 }
5534
5535 if (rt->fib6_prefsrc.plen) {
5536 struct in6_addr saddr_buf;
5537 saddr_buf = rt->fib6_prefsrc.addr;
5538 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
5539 goto nla_put_failure;
5540 }
5541
5542 pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics;
5543 if (rtnetlink_put_metrics(skb, pmetrics) < 0)
5544 goto nla_put_failure;
5545
5546 if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric))
5547 goto nla_put_failure;
5548
5549
5550
5551
5552 if (rt6) {
5553 if (rt6_flags & RTF_GATEWAY &&
5554 nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway))
5555 goto nla_put_failure;
5556
5557 if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex))
5558 goto nla_put_failure;
5559 } else if (rt->fib6_nsiblings) {
5560 struct fib6_info *sibling, *next_sibling;
5561 struct nlattr *mp;
5562
5563 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
5564 if (!mp)
5565 goto nla_put_failure;
5566
5567 if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common,
5568 rt->fib6_nh->fib_nh_weight, AF_INET6) < 0)
5569 goto nla_put_failure;
5570
5571 list_for_each_entry_safe(sibling, next_sibling,
5572 &rt->fib6_siblings, fib6_siblings) {
5573 if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common,
5574 sibling->fib6_nh->fib_nh_weight,
5575 AF_INET6) < 0)
5576 goto nla_put_failure;
5577 }
5578
5579 nla_nest_end(skb, mp);
5580 } else if (rt->nh) {
5581 if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id))
5582 goto nla_put_failure;
5583
5584 if (nexthop_is_blackhole(rt->nh))
5585 rtm->rtm_type = RTN_BLACKHOLE;
5586
5587 if (net->ipv4.sysctl_nexthop_compat_mode &&
5588 rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0)
5589 goto nla_put_failure;
5590
5591 rtm->rtm_flags |= nh_flags;
5592 } else {
5593 if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, AF_INET6,
5594 &nh_flags, false) < 0)
5595 goto nla_put_failure;
5596
5597 rtm->rtm_flags |= nh_flags;
5598 }
5599
5600 if (rt6_flags & RTF_EXPIRES) {
5601 expires = dst ? dst->expires : rt->expires;
5602 expires -= jiffies;
5603 }
5604
5605 if (!dst) {
5606 if (rt->offload)
5607 rtm->rtm_flags |= RTM_F_OFFLOAD;
5608 if (rt->trap)
5609 rtm->rtm_flags |= RTM_F_TRAP;
5610 }
5611
5612 if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0)
5613 goto nla_put_failure;
5614
5615 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags)))
5616 goto nla_put_failure;
5617
5618
5619 nlmsg_end(skb, nlh);
5620 return 0;
5621
5622nla_put_failure:
5623 nlmsg_cancel(skb, nlh);
5624 return -EMSGSIZE;
5625}
5626
5627static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg)
5628{
5629 const struct net_device *dev = arg;
5630
5631 if (nh->fib_nh_dev == dev)
5632 return 1;
5633
5634 return 0;
5635}
5636
5637static bool fib6_info_uses_dev(const struct fib6_info *f6i,
5638 const struct net_device *dev)
5639{
5640 if (f6i->nh) {
5641 struct net_device *_dev = (struct net_device *)dev;
5642
5643 return !!nexthop_for_each_fib6_nh(f6i->nh,
5644 fib6_info_nh_uses_dev,
5645 _dev);
5646 }
5647
5648 if (f6i->fib6_nh->fib_nh_dev == dev)
5649 return true;
5650
5651 if (f6i->fib6_nsiblings) {
5652 struct fib6_info *sibling, *next_sibling;
5653
5654 list_for_each_entry_safe(sibling, next_sibling,
5655 &f6i->fib6_siblings, fib6_siblings) {
5656 if (sibling->fib6_nh->fib_nh_dev == dev)
5657 return true;
5658 }
5659 }
5660
5661 return false;
5662}
5663
5664struct fib6_nh_exception_dump_walker {
5665 struct rt6_rtnl_dump_arg *dump;
5666 struct fib6_info *rt;
5667 unsigned int flags;
5668 unsigned int skip;
5669 unsigned int count;
5670};
5671
5672static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg)
5673{
5674 struct fib6_nh_exception_dump_walker *w = arg;
5675 struct rt6_rtnl_dump_arg *dump = w->dump;
5676 struct rt6_exception_bucket *bucket;
5677 struct rt6_exception *rt6_ex;
5678 int i, err;
5679
5680 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
5681 if (!bucket)
5682 return 0;
5683
5684 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
5685 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
5686 if (w->skip) {
5687 w->skip--;
5688 continue;
5689 }
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702 if (rt6_check_expired(rt6_ex->rt6i)) {
5703 w->count++;
5704 continue;
5705 }
5706
5707 err = rt6_fill_node(dump->net, dump->skb, w->rt,
5708 &rt6_ex->rt6i->dst, NULL, NULL, 0,
5709 RTM_NEWROUTE,
5710 NETLINK_CB(dump->cb->skb).portid,
5711 dump->cb->nlh->nlmsg_seq, w->flags);
5712 if (err)
5713 return err;
5714
5715 w->count++;
5716 }
5717 bucket++;
5718 }
5719
5720 return 0;
5721}
5722
5723
5724int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip)
5725{
5726 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
5727 struct fib_dump_filter *filter = &arg->filter;
5728 unsigned int flags = NLM_F_MULTI;
5729 struct net *net = arg->net;
5730 int count = 0;
5731
5732 if (rt == net->ipv6.fib6_null_entry)
5733 return -1;
5734
5735 if ((filter->flags & RTM_F_PREFIX) &&
5736 !(rt->fib6_flags & RTF_PREFIX_RT)) {
5737
5738 return -1;
5739 }
5740 if (filter->filter_set &&
5741 ((filter->rt_type && rt->fib6_type != filter->rt_type) ||
5742 (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) ||
5743 (filter->protocol && rt->fib6_protocol != filter->protocol))) {
5744 return -1;
5745 }
5746
5747 if (filter->filter_set ||
5748 !filter->dump_routes || !filter->dump_exceptions) {
5749 flags |= NLM_F_DUMP_FILTERED;
5750 }
5751
5752 if (filter->dump_routes) {
5753 if (skip) {
5754 skip--;
5755 } else {
5756 if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL,
5757 0, RTM_NEWROUTE,
5758 NETLINK_CB(arg->cb->skb).portid,
5759 arg->cb->nlh->nlmsg_seq, flags)) {
5760 return 0;
5761 }
5762 count++;
5763 }
5764 }
5765
5766 if (filter->dump_exceptions) {
5767 struct fib6_nh_exception_dump_walker w = { .dump = arg,
5768 .rt = rt,
5769 .flags = flags,
5770 .skip = skip,
5771 .count = 0 };
5772 int err;
5773
5774 rcu_read_lock();
5775 if (rt->nh) {
5776 err = nexthop_for_each_fib6_nh(rt->nh,
5777 rt6_nh_dump_exceptions,
5778 &w);
5779 } else {
5780 err = rt6_nh_dump_exceptions(rt->fib6_nh, &w);
5781 }
5782 rcu_read_unlock();
5783
5784 if (err)
5785 return count += w.count;
5786 }
5787
5788 return -1;
5789}
5790
5791static int inet6_rtm_valid_getroute_req(struct sk_buff *skb,
5792 const struct nlmsghdr *nlh,
5793 struct nlattr **tb,
5794 struct netlink_ext_ack *extack)
5795{
5796 struct rtmsg *rtm;
5797 int i, err;
5798
5799 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
5800 NL_SET_ERR_MSG_MOD(extack,
5801 "Invalid header for get route request");
5802 return -EINVAL;
5803 }
5804
5805 if (!netlink_strict_get_check(skb))
5806 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
5807 rtm_ipv6_policy, extack);
5808
5809 rtm = nlmsg_data(nlh);
5810 if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
5811 (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
5812 rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope ||
5813 rtm->rtm_type) {
5814 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
5815 return -EINVAL;
5816 }
5817 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
5818 NL_SET_ERR_MSG_MOD(extack,
5819 "Invalid flags for get route request");
5820 return -EINVAL;
5821 }
5822
5823 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
5824 rtm_ipv6_policy, extack);
5825 if (err)
5826 return err;
5827
5828 if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
5829 (tb[RTA_DST] && !rtm->rtm_dst_len)) {
5830 NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6");
5831 return -EINVAL;
5832 }
5833
5834 for (i = 0; i <= RTA_MAX; i++) {
5835 if (!tb[i])
5836 continue;
5837
5838 switch (i) {
5839 case RTA_SRC:
5840 case RTA_DST:
5841 case RTA_IIF:
5842 case RTA_OIF:
5843 case RTA_MARK:
5844 case RTA_UID:
5845 case RTA_SPORT:
5846 case RTA_DPORT:
5847 case RTA_IP_PROTO:
5848 break;
5849 default:
5850 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
5851 return -EINVAL;
5852 }
5853 }
5854
5855 return 0;
5856}
5857
5858static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5859 struct netlink_ext_ack *extack)
5860{
5861 struct net *net = sock_net(in_skb->sk);
5862 struct nlattr *tb[RTA_MAX+1];
5863 int err, iif = 0, oif = 0;
5864 struct fib6_info *from;
5865 struct dst_entry *dst;
5866 struct rt6_info *rt;
5867 struct sk_buff *skb;
5868 struct rtmsg *rtm;
5869 struct flowi6 fl6 = {};
5870 bool fibmatch;
5871
5872 err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
5873 if (err < 0)
5874 goto errout;
5875
5876 err = -EINVAL;
5877 rtm = nlmsg_data(nlh);
5878 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
5879 fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
5880
5881 if (tb[RTA_SRC]) {
5882 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
5883 goto errout;
5884
5885 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
5886 }
5887
5888 if (tb[RTA_DST]) {
5889 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
5890 goto errout;
5891
5892 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
5893 }
5894
5895 if (tb[RTA_IIF])
5896 iif = nla_get_u32(tb[RTA_IIF]);
5897
5898 if (tb[RTA_OIF])
5899 oif = nla_get_u32(tb[RTA_OIF]);
5900
5901 if (tb[RTA_MARK])
5902 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
5903
5904 if (tb[RTA_UID])
5905 fl6.flowi6_uid = make_kuid(current_user_ns(),
5906 nla_get_u32(tb[RTA_UID]));
5907 else
5908 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
5909
5910 if (tb[RTA_SPORT])
5911 fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]);
5912
5913 if (tb[RTA_DPORT])
5914 fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]);
5915
5916 if (tb[RTA_IP_PROTO]) {
5917 err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
5918 &fl6.flowi6_proto, AF_INET6,
5919 extack);
5920 if (err)
5921 goto errout;
5922 }
5923
5924 if (iif) {
5925 struct net_device *dev;
5926 int flags = 0;
5927
5928 rcu_read_lock();
5929
5930 dev = dev_get_by_index_rcu(net, iif);
5931 if (!dev) {
5932 rcu_read_unlock();
5933 err = -ENODEV;
5934 goto errout;
5935 }
5936
5937 fl6.flowi6_iif = iif;
5938
5939 if (!ipv6_addr_any(&fl6.saddr))
5940 flags |= RT6_LOOKUP_F_HAS_SADDR;
5941
5942 dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags);
5943
5944 rcu_read_unlock();
5945 } else {
5946 fl6.flowi6_oif = oif;
5947
5948 dst = ip6_route_output(net, NULL, &fl6);
5949 }
5950
5951
5952 rt = container_of(dst, struct rt6_info, dst);
5953 if (rt->dst.error) {
5954 err = rt->dst.error;
5955 ip6_rt_put(rt);
5956 goto errout;
5957 }
5958
5959 if (rt == net->ipv6.ip6_null_entry) {
5960 err = rt->dst.error;
5961 ip6_rt_put(rt);
5962 goto errout;
5963 }
5964
5965 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
5966 if (!skb) {
5967 ip6_rt_put(rt);
5968 err = -ENOBUFS;
5969 goto errout;
5970 }
5971
5972 skb_dst_set(skb, &rt->dst);
5973
5974 rcu_read_lock();
5975 from = rcu_dereference(rt->from);
5976 if (from) {
5977 if (fibmatch)
5978 err = rt6_fill_node(net, skb, from, NULL, NULL, NULL,
5979 iif, RTM_NEWROUTE,
5980 NETLINK_CB(in_skb).portid,
5981 nlh->nlmsg_seq, 0);
5982 else
5983 err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
5984 &fl6.saddr, iif, RTM_NEWROUTE,
5985 NETLINK_CB(in_skb).portid,
5986 nlh->nlmsg_seq, 0);
5987 } else {
5988 err = -ENETUNREACH;
5989 }
5990 rcu_read_unlock();
5991
5992 if (err < 0) {
5993 kfree_skb(skb);
5994 goto errout;
5995 }
5996
5997 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
5998errout:
5999 return err;
6000}
6001
6002void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
6003 unsigned int nlm_flags)
6004{
6005 struct sk_buff *skb;
6006 struct net *net = info->nl_net;
6007 u32 seq;
6008 int err;
6009
6010 err = -ENOBUFS;
6011 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
6012
6013 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
6014 if (!skb)
6015 goto errout;
6016
6017 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
6018 event, info->portid, seq, nlm_flags);
6019 if (err < 0) {
6020
6021 WARN_ON(err == -EMSGSIZE);
6022 kfree_skb(skb);
6023 goto errout;
6024 }
6025 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
6026 info->nlh, gfp_any());
6027 return;
6028errout:
6029 if (err < 0)
6030 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6031}
6032
6033void fib6_rt_update(struct net *net, struct fib6_info *rt,
6034 struct nl_info *info)
6035{
6036 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
6037 struct sk_buff *skb;
6038 int err = -ENOBUFS;
6039
6040
6041
6042
6043 call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, rt, NULL);
6044
6045 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
6046 if (!skb)
6047 goto errout;
6048
6049 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
6050 RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE);
6051 if (err < 0) {
6052
6053 WARN_ON(err == -EMSGSIZE);
6054 kfree_skb(skb);
6055 goto errout;
6056 }
6057 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
6058 info->nlh, gfp_any());
6059 return;
6060errout:
6061 if (err < 0)
6062 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6063}
6064
6065static int ip6_route_dev_notify(struct notifier_block *this,
6066 unsigned long event, void *ptr)
6067{
6068 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6069 struct net *net = dev_net(dev);
6070
6071 if (!(dev->flags & IFF_LOOPBACK))
6072 return NOTIFY_OK;
6073
6074 if (event == NETDEV_REGISTER) {
6075 net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev;
6076 net->ipv6.ip6_null_entry->dst.dev = dev;
6077 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
6078#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6079 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
6080 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
6081 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
6082 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
6083#endif
6084 } else if (event == NETDEV_UNREGISTER &&
6085 dev->reg_state != NETREG_UNREGISTERED) {
6086
6087
6088
6089 in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
6090#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6091 in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
6092 in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
6093#endif
6094 }
6095
6096 return NOTIFY_OK;
6097}
6098
6099
6100
6101
6102
6103#ifdef CONFIG_PROC_FS
6104static int rt6_stats_seq_show(struct seq_file *seq, void *v)
6105{
6106 struct net *net = (struct net *)seq->private;
6107 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
6108 net->ipv6.rt6_stats->fib_nodes,
6109 net->ipv6.rt6_stats->fib_route_nodes,
6110 atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc),
6111 net->ipv6.rt6_stats->fib_rt_entries,
6112 net->ipv6.rt6_stats->fib_rt_cache,
6113 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
6114 net->ipv6.rt6_stats->fib_discarded_routes);
6115
6116 return 0;
6117}
6118#endif
6119
6120#ifdef CONFIG_SYSCTL
6121
6122static int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
6123 void *buffer, size_t *lenp, loff_t *ppos)
6124{
6125 struct net *net;
6126 int delay;
6127 int ret;
6128 if (!write)
6129 return -EINVAL;
6130
6131 net = (struct net *)ctl->extra1;
6132 delay = net->ipv6.sysctl.flush_delay;
6133 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6134 if (ret)
6135 return ret;
6136
6137 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
6138 return 0;
6139}
6140
6141static struct ctl_table ipv6_route_table_template[] = {
6142 {
6143 .procname = "flush",
6144 .data = &init_net.ipv6.sysctl.flush_delay,
6145 .maxlen = sizeof(int),
6146 .mode = 0200,
6147 .proc_handler = ipv6_sysctl_rtcache_flush
6148 },
6149 {
6150 .procname = "gc_thresh",
6151 .data = &ip6_dst_ops_template.gc_thresh,
6152 .maxlen = sizeof(int),
6153 .mode = 0644,
6154 .proc_handler = proc_dointvec,
6155 },
6156 {
6157 .procname = "max_size",
6158 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
6159 .maxlen = sizeof(int),
6160 .mode = 0644,
6161 .proc_handler = proc_dointvec,
6162 },
6163 {
6164 .procname = "gc_min_interval",
6165 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
6166 .maxlen = sizeof(int),
6167 .mode = 0644,
6168 .proc_handler = proc_dointvec_jiffies,
6169 },
6170 {
6171 .procname = "gc_timeout",
6172 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
6173 .maxlen = sizeof(int),
6174 .mode = 0644,
6175 .proc_handler = proc_dointvec_jiffies,
6176 },
6177 {
6178 .procname = "gc_interval",
6179 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
6180 .maxlen = sizeof(int),
6181 .mode = 0644,
6182 .proc_handler = proc_dointvec_jiffies,
6183 },
6184 {
6185 .procname = "gc_elasticity",
6186 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
6187 .maxlen = sizeof(int),
6188 .mode = 0644,
6189 .proc_handler = proc_dointvec,
6190 },
6191 {
6192 .procname = "mtu_expires",
6193 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
6194 .maxlen = sizeof(int),
6195 .mode = 0644,
6196 .proc_handler = proc_dointvec_jiffies,
6197 },
6198 {
6199 .procname = "min_adv_mss",
6200 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
6201 .maxlen = sizeof(int),
6202 .mode = 0644,
6203 .proc_handler = proc_dointvec,
6204 },
6205 {
6206 .procname = "gc_min_interval_ms",
6207 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
6208 .maxlen = sizeof(int),
6209 .mode = 0644,
6210 .proc_handler = proc_dointvec_ms_jiffies,
6211 },
6212 {
6213 .procname = "skip_notify_on_dev_down",
6214 .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down,
6215 .maxlen = sizeof(int),
6216 .mode = 0644,
6217 .proc_handler = proc_dointvec_minmax,
6218 .extra1 = SYSCTL_ZERO,
6219 .extra2 = SYSCTL_ONE,
6220 },
6221 { }
6222};
6223
6224struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
6225{
6226 struct ctl_table *table;
6227
6228 table = kmemdup(ipv6_route_table_template,
6229 sizeof(ipv6_route_table_template),
6230 GFP_KERNEL);
6231
6232 if (table) {
6233 table[0].data = &net->ipv6.sysctl.flush_delay;
6234 table[0].extra1 = net;
6235 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
6236 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
6237 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
6238 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
6239 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
6240 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
6241 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
6242 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
6243 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
6244 table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down;
6245
6246
6247 if (net->user_ns != &init_user_ns)
6248 table[0].procname = NULL;
6249 }
6250
6251 return table;
6252}
6253#endif
6254
6255static int __net_init ip6_route_net_init(struct net *net)
6256{
6257 int ret = -ENOMEM;
6258
6259 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
6260 sizeof(net->ipv6.ip6_dst_ops));
6261
6262 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
6263 goto out_ip6_dst_ops;
6264
6265 net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true);
6266 if (!net->ipv6.fib6_null_entry)
6267 goto out_ip6_dst_entries;
6268 memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template,
6269 sizeof(*net->ipv6.fib6_null_entry));
6270
6271 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
6272 sizeof(*net->ipv6.ip6_null_entry),
6273 GFP_KERNEL);
6274 if (!net->ipv6.ip6_null_entry)
6275 goto out_fib6_null_entry;
6276 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
6277 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
6278 ip6_template_metrics, true);
6279 INIT_LIST_HEAD(&net->ipv6.ip6_null_entry->rt6i_uncached);
6280
6281#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6282 net->ipv6.fib6_has_custom_rules = false;
6283 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
6284 sizeof(*net->ipv6.ip6_prohibit_entry),
6285 GFP_KERNEL);
6286 if (!net->ipv6.ip6_prohibit_entry)
6287 goto out_ip6_null_entry;
6288 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
6289 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
6290 ip6_template_metrics, true);
6291 INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->rt6i_uncached);
6292
6293 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
6294 sizeof(*net->ipv6.ip6_blk_hole_entry),
6295 GFP_KERNEL);
6296 if (!net->ipv6.ip6_blk_hole_entry)
6297 goto out_ip6_prohibit_entry;
6298 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
6299 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
6300 ip6_template_metrics, true);
6301 INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached);
6302#ifdef CONFIG_IPV6_SUBTREES
6303 net->ipv6.fib6_routes_require_src = 0;
6304#endif
6305#endif
6306
6307 net->ipv6.sysctl.flush_delay = 0;
6308 net->ipv6.sysctl.ip6_rt_max_size = 4096;
6309 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
6310 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
6311 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
6312 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
6313 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
6314 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
6315 net->ipv6.sysctl.skip_notify_on_dev_down = 0;
6316
6317 net->ipv6.ip6_rt_gc_expire = 30*HZ;
6318
6319 ret = 0;
6320out:
6321 return ret;
6322
6323#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6324out_ip6_prohibit_entry:
6325 kfree(net->ipv6.ip6_prohibit_entry);
6326out_ip6_null_entry:
6327 kfree(net->ipv6.ip6_null_entry);
6328#endif
6329out_fib6_null_entry:
6330 kfree(net->ipv6.fib6_null_entry);
6331out_ip6_dst_entries:
6332 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
6333out_ip6_dst_ops:
6334 goto out;
6335}
6336
6337static void __net_exit ip6_route_net_exit(struct net *net)
6338{
6339 kfree(net->ipv6.fib6_null_entry);
6340 kfree(net->ipv6.ip6_null_entry);
6341#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6342 kfree(net->ipv6.ip6_prohibit_entry);
6343 kfree(net->ipv6.ip6_blk_hole_entry);
6344#endif
6345 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
6346}
6347
6348static int __net_init ip6_route_net_init_late(struct net *net)
6349{
6350#ifdef CONFIG_PROC_FS
6351 proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops,
6352 sizeof(struct ipv6_route_iter));
6353 proc_create_net_single("rt6_stats", 0444, net->proc_net,
6354 rt6_stats_seq_show, NULL);
6355#endif
6356 return 0;
6357}
6358
6359static void __net_exit ip6_route_net_exit_late(struct net *net)
6360{
6361#ifdef CONFIG_PROC_FS
6362 remove_proc_entry("ipv6_route", net->proc_net);
6363 remove_proc_entry("rt6_stats", net->proc_net);
6364#endif
6365}
6366
6367static struct pernet_operations ip6_route_net_ops = {
6368 .init = ip6_route_net_init,
6369 .exit = ip6_route_net_exit,
6370};
6371
6372static int __net_init ipv6_inetpeer_init(struct net *net)
6373{
6374 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
6375
6376 if (!bp)
6377 return -ENOMEM;
6378 inet_peer_base_init(bp);
6379 net->ipv6.peers = bp;
6380 return 0;
6381}
6382
6383static void __net_exit ipv6_inetpeer_exit(struct net *net)
6384{
6385 struct inet_peer_base *bp = net->ipv6.peers;
6386
6387 net->ipv6.peers = NULL;
6388 inetpeer_invalidate_tree(bp);
6389 kfree(bp);
6390}
6391
6392static struct pernet_operations ipv6_inetpeer_ops = {
6393 .init = ipv6_inetpeer_init,
6394 .exit = ipv6_inetpeer_exit,
6395};
6396
6397static struct pernet_operations ip6_route_net_late_ops = {
6398 .init = ip6_route_net_init_late,
6399 .exit = ip6_route_net_exit_late,
6400};
6401
6402static struct notifier_block ip6_route_dev_notifier = {
6403 .notifier_call = ip6_route_dev_notify,
6404 .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
6405};
6406
6407void __init ip6_route_init_special_entries(void)
6408{
6409
6410
6411
6412 init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev;
6413 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
6414 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6415 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
6416 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
6417 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6418 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
6419 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6420 #endif
6421}
6422
6423#if IS_BUILTIN(CONFIG_IPV6)
6424#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6425DEFINE_BPF_ITER_FUNC(ipv6_route, struct bpf_iter_meta *meta, struct fib6_info *rt)
6426
6427BTF_ID_LIST(btf_fib6_info_id)
6428BTF_ID(struct, fib6_info)
6429
6430static const struct bpf_iter_seq_info ipv6_route_seq_info = {
6431 .seq_ops = &ipv6_route_seq_ops,
6432 .init_seq_private = bpf_iter_init_seq_net,
6433 .fini_seq_private = bpf_iter_fini_seq_net,
6434 .seq_priv_size = sizeof(struct ipv6_route_iter),
6435};
6436
6437static struct bpf_iter_reg ipv6_route_reg_info = {
6438 .target = "ipv6_route",
6439 .ctx_arg_info_size = 1,
6440 .ctx_arg_info = {
6441 { offsetof(struct bpf_iter__ipv6_route, rt),
6442 PTR_TO_BTF_ID_OR_NULL },
6443 },
6444 .seq_info = &ipv6_route_seq_info,
6445};
6446
6447static int __init bpf_iter_register(void)
6448{
6449 ipv6_route_reg_info.ctx_arg_info[0].btf_id = *btf_fib6_info_id;
6450 return bpf_iter_reg_target(&ipv6_route_reg_info);
6451}
6452
6453static void bpf_iter_unregister(void)
6454{
6455 bpf_iter_unreg_target(&ipv6_route_reg_info);
6456}
6457#endif
6458#endif
6459
6460int __init ip6_route_init(void)
6461{
6462 int ret;
6463 int cpu;
6464
6465 ret = -ENOMEM;
6466 ip6_dst_ops_template.kmem_cachep =
6467 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
6468 SLAB_HWCACHE_ALIGN, NULL);
6469 if (!ip6_dst_ops_template.kmem_cachep)
6470 goto out;
6471
6472 ret = dst_entries_init(&ip6_dst_blackhole_ops);
6473 if (ret)
6474 goto out_kmem_cache;
6475
6476 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
6477 if (ret)
6478 goto out_dst_entries;
6479
6480 ret = register_pernet_subsys(&ip6_route_net_ops);
6481 if (ret)
6482 goto out_register_inetpeer;
6483
6484 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
6485
6486 ret = fib6_init();
6487 if (ret)
6488 goto out_register_subsys;
6489
6490 ret = xfrm6_init();
6491 if (ret)
6492 goto out_fib6_init;
6493
6494 ret = fib6_rules_init();
6495 if (ret)
6496 goto xfrm6_init;
6497
6498 ret = register_pernet_subsys(&ip6_route_net_late_ops);
6499 if (ret)
6500 goto fib6_rules_init;
6501
6502 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE,
6503 inet6_rtm_newroute, NULL, 0);
6504 if (ret < 0)
6505 goto out_register_late_subsys;
6506
6507 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE,
6508 inet6_rtm_delroute, NULL, 0);
6509 if (ret < 0)
6510 goto out_register_late_subsys;
6511
6512 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE,
6513 inet6_rtm_getroute, NULL,
6514 RTNL_FLAG_DOIT_UNLOCKED);
6515 if (ret < 0)
6516 goto out_register_late_subsys;
6517
6518 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
6519 if (ret)
6520 goto out_register_late_subsys;
6521
6522#if IS_BUILTIN(CONFIG_IPV6)
6523#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6524 ret = bpf_iter_register();
6525 if (ret)
6526 goto out_register_late_subsys;
6527#endif
6528#endif
6529
6530 for_each_possible_cpu(cpu) {
6531 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
6532
6533 INIT_LIST_HEAD(&ul->head);
6534 spin_lock_init(&ul->lock);
6535 }
6536
6537out:
6538 return ret;
6539
6540out_register_late_subsys:
6541 rtnl_unregister_all(PF_INET6);
6542 unregister_pernet_subsys(&ip6_route_net_late_ops);
6543fib6_rules_init:
6544 fib6_rules_cleanup();
6545xfrm6_init:
6546 xfrm6_fini();
6547out_fib6_init:
6548 fib6_gc_cleanup();
6549out_register_subsys:
6550 unregister_pernet_subsys(&ip6_route_net_ops);
6551out_register_inetpeer:
6552 unregister_pernet_subsys(&ipv6_inetpeer_ops);
6553out_dst_entries:
6554 dst_entries_destroy(&ip6_dst_blackhole_ops);
6555out_kmem_cache:
6556 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
6557 goto out;
6558}
6559
6560void ip6_route_cleanup(void)
6561{
6562#if IS_BUILTIN(CONFIG_IPV6)
6563#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6564 bpf_iter_unregister();
6565#endif
6566#endif
6567 unregister_netdevice_notifier(&ip6_route_dev_notifier);
6568 unregister_pernet_subsys(&ip6_route_net_late_ops);
6569 fib6_rules_cleanup();
6570 xfrm6_fini();
6571 fib6_gc_cleanup();
6572 unregister_pernet_subsys(&ipv6_inetpeer_ops);
6573 unregister_pernet_subsys(&ip6_route_net_ops);
6574 dst_entries_destroy(&ip6_dst_blackhole_ops);
6575 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
6576}
6577