2 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
24 * Fixed routing subtrees.
27 #define pr_fmt(fmt) "IPv6: " fmt
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
55 #include <linux/rtnetlink.h>
57 #include <net/dst_metadata.h>
59 #include <net/netevent.h>
60 #include <net/netlink.h>
61 #include <net/nexthop.h>
62 #include <net/lwtunnel.h>
63 #include <net/ip_tunnels.h>
64 #include <net/l3mdev.h>
66 #include <asm/uaccess.h>
69 #include <linux/sysctl.h>
73 RT6_NUD_FAIL_HARD = -3,
74 RT6_NUD_FAIL_PROBE = -2,
75 RT6_NUD_FAIL_DO_RR = -1,
79 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
80 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
81 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
82 static unsigned int ip6_mtu(const struct dst_entry *dst);
83 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
84 static void ip6_dst_destroy(struct dst_entry *);
85 static void ip6_dst_ifdown(struct dst_entry *,
86 struct net_device *dev, int how);
87 static int ip6_dst_gc(struct dst_ops *ops);
89 static int ip6_pkt_discard(struct sk_buff *skb);
90 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
91 static int ip6_pkt_prohibit(struct sk_buff *skb);
92 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
93 static void ip6_link_failure(struct sk_buff *skb);
94 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
95 struct sk_buff *skb, u32 mtu);
96 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
98 static void rt6_dst_from_metrics_check(struct rt6_info *rt);
99 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
101 #ifdef CONFIG_IPV6_ROUTE_INFO
102 static struct rt6_info *rt6_add_route_info(struct net *net,
103 const struct in6_addr *prefix, int prefixlen,
104 const struct in6_addr *gwaddr, int ifindex,
106 static struct rt6_info *rt6_get_route_info(struct net *net,
107 const struct in6_addr *prefix, int prefixlen,
108 const struct in6_addr *gwaddr, int ifindex);
111 struct uncached_list {
113 struct list_head head;
116 static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
118 static void rt6_uncached_list_add(struct rt6_info *rt)
120 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
122 rt->dst.flags |= DST_NOCACHE;
123 rt->rt6i_uncached_list = ul;
125 spin_lock_bh(&ul->lock);
126 list_add_tail(&rt->rt6i_uncached, &ul->head);
127 spin_unlock_bh(&ul->lock);
130 static void rt6_uncached_list_del(struct rt6_info *rt)
132 if (!list_empty(&rt->rt6i_uncached)) {
133 struct uncached_list *ul = rt->rt6i_uncached_list;
135 spin_lock_bh(&ul->lock);
136 list_del(&rt->rt6i_uncached);
137 spin_unlock_bh(&ul->lock);
141 static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
143 struct net_device *loopback_dev = net->loopback_dev;
146 if (dev == loopback_dev)
149 for_each_possible_cpu(cpu) {
150 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
153 spin_lock_bh(&ul->lock);
154 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
155 struct inet6_dev *rt_idev = rt->rt6i_idev;
156 struct net_device *rt_dev = rt->dst.dev;
158 if (rt_idev->dev == dev) {
159 rt->rt6i_idev = in6_dev_get(loopback_dev);
160 in6_dev_put(rt_idev);
164 rt->dst.dev = loopback_dev;
165 dev_hold(rt->dst.dev);
169 spin_unlock_bh(&ul->lock);
173 static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
175 return dst_metrics_write_ptr(rt->dst.from);
178 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
180 struct rt6_info *rt = (struct rt6_info *)dst;
182 if (rt->rt6i_flags & RTF_PCPU)
183 return rt6_pcpu_cow_metrics(rt);
184 else if (rt->rt6i_flags & RTF_CACHE)
187 return dst_cow_metrics_generic(dst, old);
190 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
194 struct in6_addr *p = &rt->rt6i_gateway;
196 if (!ipv6_addr_any(p))
197 return (const void *) p;
199 return &ipv6_hdr(skb)->daddr;
203 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
207 struct rt6_info *rt = (struct rt6_info *) dst;
210 daddr = choose_neigh_daddr(rt, skb, daddr);
211 n = __ipv6_neigh_lookup(dst->dev, daddr);
214 return neigh_create(&nd_tbl, daddr, dst->dev);
217 static struct dst_ops ip6_dst_ops_template = {
221 .check = ip6_dst_check,
222 .default_advmss = ip6_default_advmss,
224 .cow_metrics = ipv6_cow_metrics,
225 .destroy = ip6_dst_destroy,
226 .ifdown = ip6_dst_ifdown,
227 .negative_advice = ip6_negative_advice,
228 .link_failure = ip6_link_failure,
229 .update_pmtu = ip6_rt_update_pmtu,
230 .redirect = rt6_do_redirect,
231 .local_out = __ip6_local_out,
232 .neigh_lookup = ip6_neigh_lookup,
235 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
237 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
239 return mtu ? : dst->dev->mtu;
242 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
243 struct sk_buff *skb, u32 mtu)
247 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
252 static struct dst_ops ip6_dst_blackhole_ops = {
254 .destroy = ip6_dst_destroy,
255 .check = ip6_dst_check,
256 .mtu = ip6_blackhole_mtu,
257 .default_advmss = ip6_default_advmss,
258 .update_pmtu = ip6_rt_blackhole_update_pmtu,
259 .redirect = ip6_rt_blackhole_redirect,
260 .cow_metrics = dst_cow_metrics_generic,
261 .neigh_lookup = ip6_neigh_lookup,
264 static const u32 ip6_template_metrics[RTAX_MAX] = {
265 [RTAX_HOPLIMIT - 1] = 0,
268 static const struct rt6_info ip6_null_entry_template = {
270 .__refcnt = ATOMIC_INIT(1),
272 .obsolete = DST_OBSOLETE_FORCE_CHK,
273 .error = -ENETUNREACH,
274 .input = ip6_pkt_discard,
275 .output = ip6_pkt_discard_out,
277 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
278 .rt6i_protocol = RTPROT_KERNEL,
279 .rt6i_metric = ~(u32) 0,
280 .rt6i_ref = ATOMIC_INIT(1),
283 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
285 static const struct rt6_info ip6_prohibit_entry_template = {
287 .__refcnt = ATOMIC_INIT(1),
289 .obsolete = DST_OBSOLETE_FORCE_CHK,
291 .input = ip6_pkt_prohibit,
292 .output = ip6_pkt_prohibit_out,
294 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
295 .rt6i_protocol = RTPROT_KERNEL,
296 .rt6i_metric = ~(u32) 0,
297 .rt6i_ref = ATOMIC_INIT(1),
300 static const struct rt6_info ip6_blk_hole_entry_template = {
302 .__refcnt = ATOMIC_INIT(1),
304 .obsolete = DST_OBSOLETE_FORCE_CHK,
306 .input = dst_discard,
307 .output = dst_discard_out,
309 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
310 .rt6i_protocol = RTPROT_KERNEL,
311 .rt6i_metric = ~(u32) 0,
312 .rt6i_ref = ATOMIC_INIT(1),
317 static void rt6_info_init(struct rt6_info *rt)
319 struct dst_entry *dst = &rt->dst;
321 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
322 INIT_LIST_HEAD(&rt->rt6i_siblings);
323 INIT_LIST_HEAD(&rt->rt6i_uncached);
326 /* allocate dst with ip6_dst_ops */
327 static struct rt6_info *__ip6_dst_alloc(struct net *net,
328 struct net_device *dev,
331 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
332 0, DST_OBSOLETE_FORCE_CHK, flags);
340 static struct rt6_info *ip6_dst_alloc(struct net *net,
341 struct net_device *dev,
344 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
347 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
351 for_each_possible_cpu(cpu) {
354 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
355 /* no one shares rt */
359 dst_destroy((struct dst_entry *)rt);
367 static void ip6_dst_destroy(struct dst_entry *dst)
369 struct rt6_info *rt = (struct rt6_info *)dst;
370 struct dst_entry *from = dst->from;
371 struct inet6_dev *idev;
373 dst_destroy_metrics_generic(dst);
374 free_percpu(rt->rt6i_pcpu);
375 rt6_uncached_list_del(rt);
377 idev = rt->rt6i_idev;
379 rt->rt6i_idev = NULL;
387 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
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;
395 if (dev != loopback_dev) {
396 if (idev && idev->dev == dev) {
397 struct inet6_dev *loopback_idev =
398 in6_dev_get(loopback_dev);
400 rt->rt6i_idev = loopback_idev;
407 static bool rt6_check_expired(const struct rt6_info *rt)
409 if (rt->rt6i_flags & RTF_EXPIRES) {
410 if (time_after(jiffies, rt->dst.expires))
412 } else if (rt->dst.from) {
413 return rt6_check_expired((struct rt6_info *) rt->dst.from);
418 /* Multipath route selection:
419 * Hash based function using packet header and flowlabel.
420 * Adapted from fib_info_hashfn()
422 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
423 const struct flowi6 *fl6)
425 return get_hash_from_flowi6(fl6) % candidate_count;
428 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
429 struct flowi6 *fl6, int oif,
432 struct rt6_info *sibling, *next_sibling;
435 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
436 /* Don't change the route, if route_choosen == 0
437 * (siblings does not include ourself)
440 list_for_each_entry_safe(sibling, next_sibling,
441 &match->rt6i_siblings, rt6i_siblings) {
443 if (route_choosen == 0) {
444 if (rt6_score_route(sibling, oif, strict) < 0)
454 * Route lookup. Any table->tb6_lock is implied.
457 static inline struct rt6_info *rt6_device_match(struct net *net,
459 const struct in6_addr *saddr,
463 struct rt6_info *local = NULL;
464 struct rt6_info *sprt;
466 if (!oif && ipv6_addr_any(saddr))
469 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
470 struct net_device *dev = sprt->dst.dev;
473 if (dev->ifindex == oif)
475 if (dev->flags & IFF_LOOPBACK) {
476 if (!sprt->rt6i_idev ||
477 sprt->rt6i_idev->dev->ifindex != oif) {
478 if (flags & RT6_LOOKUP_F_IFACE)
481 local->rt6i_idev->dev->ifindex == oif)
487 if (ipv6_chk_addr(net, saddr, dev,
488 flags & RT6_LOOKUP_F_IFACE))
497 if (flags & RT6_LOOKUP_F_IFACE)
498 return net->ipv6.ip6_null_entry;
504 #ifdef CONFIG_IPV6_ROUTER_PREF
505 struct __rt6_probe_work {
506 struct work_struct work;
507 struct in6_addr target;
508 struct net_device *dev;
511 static void rt6_probe_deferred(struct work_struct *w)
513 struct in6_addr mcaddr;
514 struct __rt6_probe_work *work =
515 container_of(w, struct __rt6_probe_work, work);
517 addrconf_addr_solict_mult(&work->target, &mcaddr);
518 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, NULL);
523 static void rt6_probe(struct rt6_info *rt)
525 struct __rt6_probe_work *work;
526 struct neighbour *neigh;
528 * Okay, this does not seem to be appropriate
529 * for now, however, we need to check if it
530 * is really so; aka Router Reachability Probing.
532 * Router Reachability Probe MUST be rate-limited
533 * to no more than one per minute.
535 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
538 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
540 if (neigh->nud_state & NUD_VALID)
544 write_lock(&neigh->lock);
545 if (!(neigh->nud_state & NUD_VALID) &&
548 rt->rt6i_idev->cnf.rtr_probe_interval)) {
549 work = kmalloc(sizeof(*work), GFP_ATOMIC);
551 __neigh_set_probe_once(neigh);
553 write_unlock(&neigh->lock);
555 work = kmalloc(sizeof(*work), GFP_ATOMIC);
559 INIT_WORK(&work->work, rt6_probe_deferred);
560 work->target = rt->rt6i_gateway;
561 dev_hold(rt->dst.dev);
562 work->dev = rt->dst.dev;
563 schedule_work(&work->work);
567 rcu_read_unlock_bh();
570 static inline void rt6_probe(struct rt6_info *rt)
576 * Default Router Selection (RFC 2461 6.3.6)
578 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
580 struct net_device *dev = rt->dst.dev;
581 if (!oif || dev->ifindex == oif)
583 if ((dev->flags & IFF_LOOPBACK) &&
584 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
589 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
591 struct neighbour *neigh;
592 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
594 if (rt->rt6i_flags & RTF_NONEXTHOP ||
595 !(rt->rt6i_flags & RTF_GATEWAY))
596 return RT6_NUD_SUCCEED;
599 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
601 read_lock(&neigh->lock);
602 if (neigh->nud_state & NUD_VALID)
603 ret = RT6_NUD_SUCCEED;
604 #ifdef CONFIG_IPV6_ROUTER_PREF
605 else if (!(neigh->nud_state & NUD_FAILED))
606 ret = RT6_NUD_SUCCEED;
608 ret = RT6_NUD_FAIL_PROBE;
610 read_unlock(&neigh->lock);
612 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
613 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
615 rcu_read_unlock_bh();
620 static int rt6_score_route(struct rt6_info *rt, int oif,
625 m = rt6_check_dev(rt, oif);
626 if (!m && (strict & RT6_LOOKUP_F_IFACE))
627 return RT6_NUD_FAIL_HARD;
628 #ifdef CONFIG_IPV6_ROUTER_PREF
629 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
631 if (strict & RT6_LOOKUP_F_REACHABLE) {
632 int n = rt6_check_neigh(rt);
639 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
640 int *mpri, struct rt6_info *match,
644 bool match_do_rr = false;
645 struct inet6_dev *idev = rt->rt6i_idev;
646 struct net_device *dev = rt->dst.dev;
648 if (dev && !netif_carrier_ok(dev) &&
649 idev->cnf.ignore_routes_with_linkdown)
652 if (rt6_check_expired(rt))
655 m = rt6_score_route(rt, oif, strict);
656 if (m == RT6_NUD_FAIL_DO_RR) {
658 m = 0; /* lowest valid score */
659 } else if (m == RT6_NUD_FAIL_HARD) {
663 if (strict & RT6_LOOKUP_F_REACHABLE)
666 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
668 *do_rr = match_do_rr;
676 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
677 struct rt6_info *rr_head,
678 u32 metric, int oif, int strict,
681 struct rt6_info *rt, *match, *cont;
686 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
687 if (rt->rt6i_metric != metric) {
692 match = find_match(rt, oif, strict, &mpri, match, do_rr);
695 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
696 if (rt->rt6i_metric != metric) {
701 match = find_match(rt, oif, strict, &mpri, match, do_rr);
707 for (rt = cont; rt; rt = rt->dst.rt6_next)
708 match = find_match(rt, oif, strict, &mpri, match, do_rr);
713 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
715 struct rt6_info *match, *rt0;
721 fn->rr_ptr = rt0 = fn->leaf;
723 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
727 struct rt6_info *next = rt0->dst.rt6_next;
729 /* no entries matched; do round-robin */
730 if (!next || next->rt6i_metric != rt0->rt6i_metric)
737 net = dev_net(rt0->dst.dev);
738 return match ? match : net->ipv6.ip6_null_entry;
741 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
743 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
746 #ifdef CONFIG_IPV6_ROUTE_INFO
747 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
748 const struct in6_addr *gwaddr)
750 struct net *net = dev_net(dev);
751 struct route_info *rinfo = (struct route_info *) opt;
752 struct in6_addr prefix_buf, *prefix;
754 unsigned long lifetime;
757 if (len < sizeof(struct route_info)) {
761 /* Sanity check for prefix_len and length */
762 if (rinfo->length > 3) {
764 } else if (rinfo->prefix_len > 128) {
766 } else if (rinfo->prefix_len > 64) {
767 if (rinfo->length < 2) {
770 } else if (rinfo->prefix_len > 0) {
771 if (rinfo->length < 1) {
776 pref = rinfo->route_pref;
777 if (pref == ICMPV6_ROUTER_PREF_INVALID)
780 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
782 if (rinfo->length == 3)
783 prefix = (struct in6_addr *)rinfo->prefix;
785 /* this function is safe */
786 ipv6_addr_prefix(&prefix_buf,
787 (struct in6_addr *)rinfo->prefix,
789 prefix = &prefix_buf;
792 if (rinfo->prefix_len == 0)
793 rt = rt6_get_dflt_router(gwaddr, dev);
795 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
796 gwaddr, dev->ifindex);
798 if (rt && !lifetime) {
804 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
807 rt->rt6i_flags = RTF_ROUTEINFO |
808 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
811 if (!addrconf_finite_timeout(lifetime))
812 rt6_clean_expires(rt);
814 rt6_set_expires(rt, jiffies + HZ * lifetime);
822 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
823 struct in6_addr *saddr)
825 struct fib6_node *pn;
827 if (fn->fn_flags & RTN_TL_ROOT)
830 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
831 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
834 if (fn->fn_flags & RTN_RTINFO)
839 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
840 struct fib6_table *table,
841 struct flowi6 *fl6, int flags)
843 struct fib6_node *fn;
846 read_lock_bh(&table->tb6_lock);
847 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
850 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
851 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
852 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
853 if (rt == net->ipv6.ip6_null_entry) {
854 fn = fib6_backtrack(fn, &fl6->saddr);
858 dst_use(&rt->dst, jiffies);
859 read_unlock_bh(&table->tb6_lock);
864 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
867 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
869 EXPORT_SYMBOL_GPL(ip6_route_lookup);
871 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
872 const struct in6_addr *saddr, int oif, int strict)
874 struct flowi6 fl6 = {
878 struct dst_entry *dst;
879 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
882 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
883 flags |= RT6_LOOKUP_F_HAS_SADDR;
886 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
888 return (struct rt6_info *) dst;
894 EXPORT_SYMBOL(rt6_lookup);
896 /* ip6_ins_rt is called with FREE table->tb6_lock.
897 It takes new route entry, the addition fails by any reason the
898 route is freed. In any case, if caller does not hold it, it may
902 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
903 struct mx6_config *mxc)
906 struct fib6_table *table;
908 table = rt->rt6i_table;
909 write_lock_bh(&table->tb6_lock);
910 err = fib6_add(&table->tb6_root, rt, info, mxc);
911 write_unlock_bh(&table->tb6_lock);
916 int ip6_ins_rt(struct rt6_info *rt)
918 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
919 struct mx6_config mxc = { .mx = NULL, };
921 return __ip6_ins_rt(rt, &info, &mxc);
924 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
925 const struct in6_addr *daddr,
926 const struct in6_addr *saddr)
934 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
935 ort = (struct rt6_info *)ort->dst.from;
937 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
942 ip6_rt_copy_init(rt, ort);
943 rt->rt6i_flags |= RTF_CACHE;
945 rt->dst.flags |= DST_HOST;
946 rt->rt6i_dst.addr = *daddr;
947 rt->rt6i_dst.plen = 128;
949 if (!rt6_is_gw_or_nonexthop(ort)) {
950 if (ort->rt6i_dst.plen != 128 &&
951 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
952 rt->rt6i_flags |= RTF_ANYCAST;
953 #ifdef CONFIG_IPV6_SUBTREES
954 if (rt->rt6i_src.plen && saddr) {
955 rt->rt6i_src.addr = *saddr;
956 rt->rt6i_src.plen = 128;
964 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
966 struct rt6_info *pcpu_rt;
968 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
969 rt->dst.dev, rt->dst.flags);
973 ip6_rt_copy_init(pcpu_rt, rt);
974 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
975 pcpu_rt->rt6i_flags |= RTF_PCPU;
979 /* It should be called with read_lock_bh(&tb6_lock) acquired */
980 static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
982 struct rt6_info *pcpu_rt, **p;
984 p = this_cpu_ptr(rt->rt6i_pcpu);
988 dst_hold(&pcpu_rt->dst);
989 rt6_dst_from_metrics_check(pcpu_rt);
994 static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
996 struct fib6_table *table = rt->rt6i_table;
997 struct rt6_info *pcpu_rt, *prev, **p;
999 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1001 struct net *net = dev_net(rt->dst.dev);
1003 dst_hold(&net->ipv6.ip6_null_entry->dst);
1004 return net->ipv6.ip6_null_entry;
1007 read_lock_bh(&table->tb6_lock);
1008 if (rt->rt6i_pcpu) {
1009 p = this_cpu_ptr(rt->rt6i_pcpu);
1010 prev = cmpxchg(p, NULL, pcpu_rt);
1012 /* If someone did it before us, return prev instead */
1013 dst_destroy(&pcpu_rt->dst);
1017 /* rt has been removed from the fib6 tree
1018 * before we have a chance to acquire the read_lock.
1019 * In this case, don't brother to create a pcpu rt
1020 * since rt is going away anyway. The next
1021 * dst_check() will trigger a re-lookup.
1023 dst_destroy(&pcpu_rt->dst);
1026 dst_hold(&pcpu_rt->dst);
1027 rt6_dst_from_metrics_check(pcpu_rt);
1028 read_unlock_bh(&table->tb6_lock);
1032 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
1033 struct flowi6 *fl6, int flags)
1035 struct fib6_node *fn, *saved_fn;
1036 struct rt6_info *rt;
1039 strict |= flags & RT6_LOOKUP_F_IFACE;
1040 if (net->ipv6.devconf_all->forwarding == 0)
1041 strict |= RT6_LOOKUP_F_REACHABLE;
1043 read_lock_bh(&table->tb6_lock);
1045 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1048 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1052 rt = rt6_select(fn, oif, strict);
1053 if (rt->rt6i_nsiblings)
1054 rt = rt6_multipath_select(rt, fl6, oif, strict);
1055 if (rt == net->ipv6.ip6_null_entry) {
1056 fn = fib6_backtrack(fn, &fl6->saddr);
1058 goto redo_rt6_select;
1059 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1060 /* also consider unreachable route */
1061 strict &= ~RT6_LOOKUP_F_REACHABLE;
1063 goto redo_rt6_select;
1068 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1069 dst_use(&rt->dst, jiffies);
1070 read_unlock_bh(&table->tb6_lock);
1072 rt6_dst_from_metrics_check(rt);
1074 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1075 !(rt->rt6i_flags & RTF_GATEWAY))) {
1076 /* Create a RTF_CACHE clone which will not be
1077 * owned by the fib6 tree. It is for the special case where
1078 * the daddr in the skb during the neighbor look-up is different
1079 * from the fl6->daddr used to look-up route here.
1082 struct rt6_info *uncached_rt;
1084 dst_use(&rt->dst, jiffies);
1085 read_unlock_bh(&table->tb6_lock);
1087 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1088 dst_release(&rt->dst);
1091 rt6_uncached_list_add(uncached_rt);
1093 uncached_rt = net->ipv6.ip6_null_entry;
1095 dst_hold(&uncached_rt->dst);
1099 /* Get a percpu copy */
1101 struct rt6_info *pcpu_rt;
1103 rt->dst.lastuse = jiffies;
1105 pcpu_rt = rt6_get_pcpu_route(rt);
1108 read_unlock_bh(&table->tb6_lock);
1110 /* We have to do the read_unlock first
1111 * because rt6_make_pcpu_route() may trigger
1112 * ip6_dst_gc() which will take the write_lock.
1115 read_unlock_bh(&table->tb6_lock);
1116 pcpu_rt = rt6_make_pcpu_route(rt);
1117 dst_release(&rt->dst);
1125 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1126 struct flowi6 *fl6, int flags)
1128 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1131 static struct dst_entry *ip6_route_input_lookup(struct net *net,
1132 struct net_device *dev,
1133 struct flowi6 *fl6, int flags)
1135 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1136 flags |= RT6_LOOKUP_F_IFACE;
1138 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1141 void ip6_route_input(struct sk_buff *skb)
1143 const struct ipv6hdr *iph = ipv6_hdr(skb);
1144 struct net *net = dev_net(skb->dev);
1145 int flags = RT6_LOOKUP_F_HAS_SADDR;
1146 struct ip_tunnel_info *tun_info;
1147 struct flowi6 fl6 = {
1148 .flowi6_iif = l3mdev_fib_oif(skb->dev),
1149 .daddr = iph->daddr,
1150 .saddr = iph->saddr,
1151 .flowlabel = ip6_flowinfo(iph),
1152 .flowi6_mark = skb->mark,
1153 .flowi6_proto = iph->nexthdr,
1156 tun_info = skb_tunnel_info(skb);
1157 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1158 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1160 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1163 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1164 struct flowi6 *fl6, int flags)
1166 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1169 struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
1172 struct dst_entry *dst;
1176 dst = l3mdev_rt6_dst_by_oif(net, fl6);
1180 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1182 any_src = ipv6_addr_any(&fl6->saddr);
1183 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1184 (fl6->flowi6_oif && any_src))
1185 flags |= RT6_LOOKUP_F_IFACE;
1188 flags |= RT6_LOOKUP_F_HAS_SADDR;
1190 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1192 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1194 EXPORT_SYMBOL(ip6_route_output);
1196 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1198 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1199 struct dst_entry *new = NULL;
1201 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1207 new->input = dst_discard;
1208 new->output = dst_discard_out;
1210 dst_copy_metrics(new, &ort->dst);
1211 rt->rt6i_idev = ort->rt6i_idev;
1213 in6_dev_hold(rt->rt6i_idev);
1215 rt->rt6i_gateway = ort->rt6i_gateway;
1216 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
1217 rt->rt6i_metric = 0;
1219 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1220 #ifdef CONFIG_IPV6_SUBTREES
1221 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1227 dst_release(dst_orig);
1228 return new ? new : ERR_PTR(-ENOMEM);
1232 * Destination cache support functions
1235 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1238 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1239 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1242 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1244 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1247 if (rt6_check_expired(rt))
1253 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1255 if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1256 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1262 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1264 struct rt6_info *rt;
1266 rt = (struct rt6_info *) dst;
1268 /* All IPV6 dsts are created with ->obsolete set to the value
1269 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1270 * into this function always.
1273 rt6_dst_from_metrics_check(rt);
1275 if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE))
1276 return rt6_dst_from_check(rt, cookie);
1278 return rt6_check(rt, cookie);
1281 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1283 struct rt6_info *rt = (struct rt6_info *) dst;
1286 if (rt->rt6i_flags & RTF_CACHE) {
1287 if (rt6_check_expired(rt)) {
1299 static void ip6_link_failure(struct sk_buff *skb)
1301 struct rt6_info *rt;
1303 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1305 rt = (struct rt6_info *) skb_dst(skb);
1307 if (rt->rt6i_flags & RTF_CACHE) {
1310 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1311 rt->rt6i_node->fn_sernum = -1;
1316 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1318 struct net *net = dev_net(rt->dst.dev);
1320 rt->rt6i_flags |= RTF_MODIFIED;
1321 rt->rt6i_pmtu = mtu;
1322 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1325 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1326 const struct ipv6hdr *iph, u32 mtu)
1328 struct rt6_info *rt6 = (struct rt6_info *)dst;
1330 if (rt6->rt6i_flags & RTF_LOCAL)
1334 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1335 if (mtu >= dst_mtu(dst))
1338 if (rt6->rt6i_flags & RTF_CACHE) {
1339 rt6_do_update_pmtu(rt6, mtu);
1341 const struct in6_addr *daddr, *saddr;
1342 struct rt6_info *nrt6;
1345 daddr = &iph->daddr;
1346 saddr = &iph->saddr;
1348 daddr = &sk->sk_v6_daddr;
1349 saddr = &inet6_sk(sk)->saddr;
1353 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1355 rt6_do_update_pmtu(nrt6, mtu);
1357 /* ip6_ins_rt(nrt6) will bump the
1358 * rt6->rt6i_node->fn_sernum
1359 * which will fail the next rt6_check() and
1360 * invalidate the sk->sk_dst_cache.
1367 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1368 struct sk_buff *skb, u32 mtu)
1370 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1373 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1376 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1377 struct dst_entry *dst;
1380 memset(&fl6, 0, sizeof(fl6));
1381 fl6.flowi6_oif = oif;
1382 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1383 fl6.daddr = iph->daddr;
1384 fl6.saddr = iph->saddr;
1385 fl6.flowlabel = ip6_flowinfo(iph);
1387 dst = ip6_route_output(net, NULL, &fl6);
1389 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1392 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1394 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1396 ip6_update_pmtu(skb, sock_net(sk), mtu,
1397 sk->sk_bound_dev_if, sk->sk_mark);
1399 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1401 /* Handle redirects */
1402 struct ip6rd_flowi {
1404 struct in6_addr gateway;
1407 static struct rt6_info *__ip6_route_redirect(struct net *net,
1408 struct fib6_table *table,
1412 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1413 struct rt6_info *rt;
1414 struct fib6_node *fn;
1416 /* Get the "current" route for this destination and
1417 * check if the redirect has come from approriate router.
1419 * RFC 4861 specifies that redirects should only be
1420 * accepted if they come from the nexthop to the target.
1421 * Due to the way the routes are chosen, this notion
1422 * is a bit fuzzy and one might need to check all possible
1426 read_lock_bh(&table->tb6_lock);
1427 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1429 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1430 if (rt6_check_expired(rt))
1434 if (!(rt->rt6i_flags & RTF_GATEWAY))
1436 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1438 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1444 rt = net->ipv6.ip6_null_entry;
1445 else if (rt->dst.error) {
1446 rt = net->ipv6.ip6_null_entry;
1450 if (rt == net->ipv6.ip6_null_entry) {
1451 fn = fib6_backtrack(fn, &fl6->saddr);
1459 read_unlock_bh(&table->tb6_lock);
1464 static struct dst_entry *ip6_route_redirect(struct net *net,
1465 const struct flowi6 *fl6,
1466 const struct in6_addr *gateway)
1468 int flags = RT6_LOOKUP_F_HAS_SADDR;
1469 struct ip6rd_flowi rdfl;
1472 rdfl.gateway = *gateway;
1474 return fib6_rule_lookup(net, &rdfl.fl6,
1475 flags, __ip6_route_redirect);
1478 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1480 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1481 struct dst_entry *dst;
1484 memset(&fl6, 0, sizeof(fl6));
1485 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1486 fl6.flowi6_oif = oif;
1487 fl6.flowi6_mark = mark;
1488 fl6.daddr = iph->daddr;
1489 fl6.saddr = iph->saddr;
1490 fl6.flowlabel = ip6_flowinfo(iph);
1492 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1493 rt6_do_redirect(dst, NULL, skb);
1496 EXPORT_SYMBOL_GPL(ip6_redirect);
1498 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1501 const struct ipv6hdr *iph = ipv6_hdr(skb);
1502 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1503 struct dst_entry *dst;
1506 memset(&fl6, 0, sizeof(fl6));
1507 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1508 fl6.flowi6_oif = oif;
1509 fl6.flowi6_mark = mark;
1510 fl6.daddr = msg->dest;
1511 fl6.saddr = iph->daddr;
1513 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1514 rt6_do_redirect(dst, NULL, skb);
1518 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1520 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1522 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1524 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1526 struct net_device *dev = dst->dev;
1527 unsigned int mtu = dst_mtu(dst);
1528 struct net *net = dev_net(dev);
1530 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1532 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1533 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1536 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1537 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1538 * IPV6_MAXPLEN is also valid and means: "any MSS,
1539 * rely only on pmtu discovery"
1541 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1546 static unsigned int ip6_mtu(const struct dst_entry *dst)
1548 const struct rt6_info *rt = (const struct rt6_info *)dst;
1549 unsigned int mtu = rt->rt6i_pmtu;
1550 struct inet6_dev *idev;
1555 mtu = dst_metric_raw(dst, RTAX_MTU);
1562 idev = __in6_dev_get(dst->dev);
1564 mtu = idev->cnf.mtu6;
1568 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1571 static struct dst_entry *icmp6_dst_gc_list;
1572 static DEFINE_SPINLOCK(icmp6_dst_lock);
1574 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1577 struct dst_entry *dst;
1578 struct rt6_info *rt;
1579 struct inet6_dev *idev = in6_dev_get(dev);
1580 struct net *net = dev_net(dev);
1582 if (unlikely(!idev))
1583 return ERR_PTR(-ENODEV);
1585 rt = ip6_dst_alloc(net, dev, 0);
1586 if (unlikely(!rt)) {
1588 dst = ERR_PTR(-ENOMEM);
1592 rt->dst.flags |= DST_HOST;
1593 rt->dst.output = ip6_output;
1594 atomic_set(&rt->dst.__refcnt, 1);
1595 rt->rt6i_gateway = fl6->daddr;
1596 rt->rt6i_dst.addr = fl6->daddr;
1597 rt->rt6i_dst.plen = 128;
1598 rt->rt6i_idev = idev;
1599 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1601 spin_lock_bh(&icmp6_dst_lock);
1602 rt->dst.next = icmp6_dst_gc_list;
1603 icmp6_dst_gc_list = &rt->dst;
1604 spin_unlock_bh(&icmp6_dst_lock);
1606 fib6_force_start_gc(net);
1608 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1614 int icmp6_dst_gc(void)
1616 struct dst_entry *dst, **pprev;
1619 spin_lock_bh(&icmp6_dst_lock);
1620 pprev = &icmp6_dst_gc_list;
1622 while ((dst = *pprev) != NULL) {
1623 if (!atomic_read(&dst->__refcnt)) {
1632 spin_unlock_bh(&icmp6_dst_lock);
1637 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1640 struct dst_entry *dst, **pprev;
1642 spin_lock_bh(&icmp6_dst_lock);
1643 pprev = &icmp6_dst_gc_list;
1644 while ((dst = *pprev) != NULL) {
1645 struct rt6_info *rt = (struct rt6_info *) dst;
1646 if (func(rt, arg)) {
1653 spin_unlock_bh(&icmp6_dst_lock);
1656 static int ip6_dst_gc(struct dst_ops *ops)
1658 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1659 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1660 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1661 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1662 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1663 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1666 entries = dst_entries_get_fast(ops);
1667 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1668 entries <= rt_max_size)
1671 net->ipv6.ip6_rt_gc_expire++;
1672 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1673 entries = dst_entries_get_slow(ops);
1674 if (entries < ops->gc_thresh)
1675 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1677 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1678 return entries > rt_max_size;
1681 static int ip6_convert_metrics(struct mx6_config *mxc,
1682 const struct fib6_config *cfg)
1684 bool ecn_ca = false;
1692 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1696 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1697 int type = nla_type(nla);
1702 if (unlikely(type > RTAX_MAX))
1705 if (type == RTAX_CC_ALGO) {
1706 char tmp[TCP_CA_NAME_MAX];
1708 nla_strlcpy(tmp, nla, sizeof(tmp));
1709 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1710 if (val == TCP_CA_UNSPEC)
1713 val = nla_get_u32(nla);
1715 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1719 __set_bit(type - 1, mxc->mx_valid);
1723 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1724 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1734 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1736 struct net *net = cfg->fc_nlinfo.nl_net;
1737 struct rt6_info *rt = NULL;
1738 struct net_device *dev = NULL;
1739 struct inet6_dev *idev = NULL;
1740 struct fib6_table *table;
1744 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1746 #ifndef CONFIG_IPV6_SUBTREES
1747 if (cfg->fc_src_len)
1750 if (cfg->fc_ifindex) {
1752 dev = dev_get_by_index(net, cfg->fc_ifindex);
1755 idev = in6_dev_get(dev);
1760 if (cfg->fc_metric == 0)
1761 cfg->fc_metric = IP6_RT_PRIO_USER;
1764 if (cfg->fc_nlinfo.nlh &&
1765 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1766 table = fib6_get_table(net, cfg->fc_table);
1768 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1769 table = fib6_new_table(net, cfg->fc_table);
1772 table = fib6_new_table(net, cfg->fc_table);
1778 rt = ip6_dst_alloc(net, NULL,
1779 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1786 if (cfg->fc_flags & RTF_EXPIRES)
1787 rt6_set_expires(rt, jiffies +
1788 clock_t_to_jiffies(cfg->fc_expires));
1790 rt6_clean_expires(rt);
1792 if (cfg->fc_protocol == RTPROT_UNSPEC)
1793 cfg->fc_protocol = RTPROT_BOOT;
1794 rt->rt6i_protocol = cfg->fc_protocol;
1796 addr_type = ipv6_addr_type(&cfg->fc_dst);
1798 if (addr_type & IPV6_ADDR_MULTICAST)
1799 rt->dst.input = ip6_mc_input;
1800 else if (cfg->fc_flags & RTF_LOCAL)
1801 rt->dst.input = ip6_input;
1803 rt->dst.input = ip6_forward;
1805 rt->dst.output = ip6_output;
1807 if (cfg->fc_encap) {
1808 struct lwtunnel_state *lwtstate;
1810 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1811 cfg->fc_encap, AF_INET6, cfg,
1815 rt->dst.lwtstate = lwtstate_get(lwtstate);
1816 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1817 rt->dst.lwtstate->orig_output = rt->dst.output;
1818 rt->dst.output = lwtunnel_output;
1820 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1821 rt->dst.lwtstate->orig_input = rt->dst.input;
1822 rt->dst.input = lwtunnel_input;
1826 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1827 rt->rt6i_dst.plen = cfg->fc_dst_len;
1828 if (rt->rt6i_dst.plen == 128)
1829 rt->dst.flags |= DST_HOST;
1831 #ifdef CONFIG_IPV6_SUBTREES
1832 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1833 rt->rt6i_src.plen = cfg->fc_src_len;
1836 rt->rt6i_metric = cfg->fc_metric;
1838 /* We cannot add true routes via loopback here,
1839 they would result in kernel looping; promote them to reject routes
1841 if ((cfg->fc_flags & RTF_REJECT) ||
1842 (dev && (dev->flags & IFF_LOOPBACK) &&
1843 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1844 !(cfg->fc_flags & RTF_LOCAL))) {
1845 /* hold loopback dev/idev if we haven't done so. */
1846 if (dev != net->loopback_dev) {
1851 dev = net->loopback_dev;
1853 idev = in6_dev_get(dev);
1859 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1860 switch (cfg->fc_type) {
1862 rt->dst.error = -EINVAL;
1863 rt->dst.output = dst_discard_out;
1864 rt->dst.input = dst_discard;
1867 rt->dst.error = -EACCES;
1868 rt->dst.output = ip6_pkt_prohibit_out;
1869 rt->dst.input = ip6_pkt_prohibit;
1872 case RTN_UNREACHABLE:
1874 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1875 : (cfg->fc_type == RTN_UNREACHABLE)
1876 ? -EHOSTUNREACH : -ENETUNREACH;
1877 rt->dst.output = ip6_pkt_discard_out;
1878 rt->dst.input = ip6_pkt_discard;
1884 if (cfg->fc_flags & RTF_GATEWAY) {
1885 const struct in6_addr *gw_addr;
1888 gw_addr = &cfg->fc_gateway;
1889 gwa_type = ipv6_addr_type(gw_addr);
1891 /* if gw_addr is local we will fail to detect this in case
1892 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1893 * will return already-added prefix route via interface that
1894 * prefix route was assigned to, which might be non-loopback.
1897 if (ipv6_chk_addr_and_flags(net, gw_addr,
1898 gwa_type & IPV6_ADDR_LINKLOCAL ?
1902 rt->rt6i_gateway = *gw_addr;
1904 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1905 struct rt6_info *grt;
1907 /* IPv6 strictly inhibits using not link-local
1908 addresses as nexthop address.
1909 Otherwise, router will not able to send redirects.
1910 It is very good, but in some (rare!) circumstances
1911 (SIT, PtP, NBMA NOARP links) it is handy to allow
1912 some exceptions. --ANK
1914 if (!(gwa_type & IPV6_ADDR_UNICAST))
1917 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1919 err = -EHOSTUNREACH;
1923 if (dev != grt->dst.dev) {
1929 idev = grt->rt6i_idev;
1931 in6_dev_hold(grt->rt6i_idev);
1933 if (!(grt->rt6i_flags & RTF_GATEWAY))
1941 if (!dev || (dev->flags & IFF_LOOPBACK))
1949 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1950 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1954 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1955 rt->rt6i_prefsrc.plen = 128;
1957 rt->rt6i_prefsrc.plen = 0;
1959 rt->rt6i_flags = cfg->fc_flags;
1963 rt->rt6i_idev = idev;
1964 rt->rt6i_table = table;
1966 cfg->fc_nlinfo.nl_net = dev_net(dev);
1977 return ERR_PTR(err);
1980 int ip6_route_add(struct fib6_config *cfg)
1982 struct mx6_config mxc = { .mx = NULL, };
1983 struct rt6_info *rt;
1986 rt = ip6_route_info_create(cfg);
1993 err = ip6_convert_metrics(&mxc, cfg);
1997 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2009 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2012 struct fib6_table *table;
2013 struct net *net = dev_net(rt->dst.dev);
2015 if (rt == net->ipv6.ip6_null_entry ||
2016 rt->dst.flags & DST_NOCACHE) {
2021 table = rt->rt6i_table;
2022 write_lock_bh(&table->tb6_lock);
2023 err = fib6_del(rt, info);
2024 write_unlock_bh(&table->tb6_lock);
2031 int ip6_del_rt(struct rt6_info *rt)
2033 struct nl_info info = {
2034 .nl_net = dev_net(rt->dst.dev),
2036 return __ip6_del_rt(rt, &info);
2039 static int ip6_route_del(struct fib6_config *cfg)
2041 struct fib6_table *table;
2042 struct fib6_node *fn;
2043 struct rt6_info *rt;
2046 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2050 read_lock_bh(&table->tb6_lock);
2052 fn = fib6_locate(&table->tb6_root,
2053 &cfg->fc_dst, cfg->fc_dst_len,
2054 &cfg->fc_src, cfg->fc_src_len);
2057 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2058 if ((rt->rt6i_flags & RTF_CACHE) &&
2059 !(cfg->fc_flags & RTF_CACHE))
2061 if (cfg->fc_ifindex &&
2063 rt->dst.dev->ifindex != cfg->fc_ifindex))
2065 if (cfg->fc_flags & RTF_GATEWAY &&
2066 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2068 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2071 read_unlock_bh(&table->tb6_lock);
2073 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2076 read_unlock_bh(&table->tb6_lock);
2081 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2083 struct netevent_redirect netevent;
2084 struct rt6_info *rt, *nrt = NULL;
2085 struct ndisc_options ndopts;
2086 struct inet6_dev *in6_dev;
2087 struct neighbour *neigh;
2089 int optlen, on_link;
2092 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2093 optlen -= sizeof(*msg);
2096 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2100 msg = (struct rd_msg *)icmp6_hdr(skb);
2102 if (ipv6_addr_is_multicast(&msg->dest)) {
2103 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2108 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2110 } else if (ipv6_addr_type(&msg->target) !=
2111 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2112 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2116 in6_dev = __in6_dev_get(skb->dev);
2119 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2123 * The IP source address of the Redirect MUST be the same as the current
2124 * first-hop router for the specified ICMP Destination Address.
2127 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
2128 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2133 if (ndopts.nd_opts_tgt_lladdr) {
2134 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2137 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2142 rt = (struct rt6_info *) dst;
2143 if (rt->rt6i_flags & RTF_REJECT) {
2144 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2148 /* Redirect received -> path was valid.
2149 * Look, redirects are sent only in response to data packets,
2150 * so that this nexthop apparently is reachable. --ANK
2152 dst_confirm(&rt->dst);
2154 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2159 * We have finally decided to accept it.
2162 neigh_update(neigh, lladdr, NUD_STALE,
2163 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2164 NEIGH_UPDATE_F_OVERRIDE|
2165 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2166 NEIGH_UPDATE_F_ISROUTER))
2169 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2173 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2175 nrt->rt6i_flags &= ~RTF_GATEWAY;
2177 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2179 if (ip6_ins_rt(nrt))
2182 netevent.old = &rt->dst;
2183 netevent.new = &nrt->dst;
2184 netevent.daddr = &msg->dest;
2185 netevent.neigh = neigh;
2186 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2188 if (rt->rt6i_flags & RTF_CACHE) {
2189 rt = (struct rt6_info *) dst_clone(&rt->dst);
2194 neigh_release(neigh);
2198 * Misc support functions
2201 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2203 BUG_ON(from->dst.from);
2205 rt->rt6i_flags &= ~RTF_EXPIRES;
2206 dst_hold(&from->dst);
2207 rt->dst.from = &from->dst;
2208 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2211 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2213 rt->dst.input = ort->dst.input;
2214 rt->dst.output = ort->dst.output;
2215 rt->rt6i_dst = ort->rt6i_dst;
2216 rt->dst.error = ort->dst.error;
2217 rt->rt6i_idev = ort->rt6i_idev;
2219 in6_dev_hold(rt->rt6i_idev);
2220 rt->dst.lastuse = jiffies;
2221 rt->rt6i_gateway = ort->rt6i_gateway;
2222 rt->rt6i_flags = ort->rt6i_flags;
2223 rt6_set_from(rt, ort);
2224 rt->rt6i_metric = ort->rt6i_metric;
2225 #ifdef CONFIG_IPV6_SUBTREES
2226 rt->rt6i_src = ort->rt6i_src;
2228 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2229 rt->rt6i_table = ort->rt6i_table;
2230 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2233 #ifdef CONFIG_IPV6_ROUTE_INFO
2234 static struct rt6_info *rt6_get_route_info(struct net *net,
2235 const struct in6_addr *prefix, int prefixlen,
2236 const struct in6_addr *gwaddr, int ifindex)
2238 struct fib6_node *fn;
2239 struct rt6_info *rt = NULL;
2240 struct fib6_table *table;
2242 table = fib6_get_table(net, RT6_TABLE_INFO);
2246 read_lock_bh(&table->tb6_lock);
2247 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2251 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2252 if (rt->dst.dev->ifindex != ifindex)
2254 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2256 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2262 read_unlock_bh(&table->tb6_lock);
2266 static struct rt6_info *rt6_add_route_info(struct net *net,
2267 const struct in6_addr *prefix, int prefixlen,
2268 const struct in6_addr *gwaddr, int ifindex,
2271 struct fib6_config cfg = {
2272 .fc_metric = IP6_RT_PRIO_USER,
2273 .fc_ifindex = ifindex,
2274 .fc_dst_len = prefixlen,
2275 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2276 RTF_UP | RTF_PREF(pref),
2277 .fc_nlinfo.portid = 0,
2278 .fc_nlinfo.nlh = NULL,
2279 .fc_nlinfo.nl_net = net,
2282 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
2283 cfg.fc_dst = *prefix;
2284 cfg.fc_gateway = *gwaddr;
2286 /* We should treat it as a default route if prefix length is 0. */
2288 cfg.fc_flags |= RTF_DEFAULT;
2290 ip6_route_add(&cfg);
2292 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
2296 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2298 struct rt6_info *rt;
2299 struct fib6_table *table;
2301 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
2305 read_lock_bh(&table->tb6_lock);
2306 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2307 if (dev == rt->dst.dev &&
2308 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2309 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2314 read_unlock_bh(&table->tb6_lock);
2318 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2319 struct net_device *dev,
2322 struct fib6_config cfg = {
2323 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
2324 .fc_metric = IP6_RT_PRIO_USER,
2325 .fc_ifindex = dev->ifindex,
2326 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2327 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2328 .fc_nlinfo.portid = 0,
2329 .fc_nlinfo.nlh = NULL,
2330 .fc_nlinfo.nl_net = dev_net(dev),
2333 cfg.fc_gateway = *gwaddr;
2335 ip6_route_add(&cfg);
2337 return rt6_get_dflt_router(gwaddr, dev);
2340 void rt6_purge_dflt_routers(struct net *net)
2342 struct rt6_info *rt;
2343 struct fib6_table *table;
2345 /* NOTE: Keep consistent with rt6_get_dflt_router */
2346 table = fib6_get_table(net, RT6_TABLE_DFLT);
2351 read_lock_bh(&table->tb6_lock);
2352 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2353 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2354 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2356 read_unlock_bh(&table->tb6_lock);
2361 read_unlock_bh(&table->tb6_lock);
2364 static void rtmsg_to_fib6_config(struct net *net,
2365 struct in6_rtmsg *rtmsg,
2366 struct fib6_config *cfg)
2368 memset(cfg, 0, sizeof(*cfg));
2370 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2372 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2373 cfg->fc_metric = rtmsg->rtmsg_metric;
2374 cfg->fc_expires = rtmsg->rtmsg_info;
2375 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2376 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2377 cfg->fc_flags = rtmsg->rtmsg_flags;
2379 cfg->fc_nlinfo.nl_net = net;
2381 cfg->fc_dst = rtmsg->rtmsg_dst;
2382 cfg->fc_src = rtmsg->rtmsg_src;
2383 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2386 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2388 struct fib6_config cfg;
2389 struct in6_rtmsg rtmsg;
2393 case SIOCADDRT: /* Add a route */
2394 case SIOCDELRT: /* Delete a route */
2395 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2397 err = copy_from_user(&rtmsg, arg,
2398 sizeof(struct in6_rtmsg));
2402 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2407 err = ip6_route_add(&cfg);
2410 err = ip6_route_del(&cfg);
2424 * Drop the packet on the floor
2427 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2430 struct dst_entry *dst = skb_dst(skb);
2431 switch (ipstats_mib_noroutes) {
2432 case IPSTATS_MIB_INNOROUTES:
2433 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2434 if (type == IPV6_ADDR_ANY) {
2435 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2436 IPSTATS_MIB_INADDRERRORS);
2440 case IPSTATS_MIB_OUTNOROUTES:
2441 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2442 ipstats_mib_noroutes);
2445 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2450 static int ip6_pkt_discard(struct sk_buff *skb)
2452 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2455 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2457 skb->dev = skb_dst(skb)->dev;
2458 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2461 static int ip6_pkt_prohibit(struct sk_buff *skb)
2463 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2466 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2468 skb->dev = skb_dst(skb)->dev;
2469 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2473 * Allocate a dst for local (unicast / anycast) address.
2476 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2477 const struct in6_addr *addr,
2481 struct net *net = dev_net(idev->dev);
2482 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2485 return ERR_PTR(-ENOMEM);
2489 rt->dst.flags |= DST_HOST;
2490 rt->dst.input = ip6_input;
2491 rt->dst.output = ip6_output;
2492 rt->rt6i_idev = idev;
2494 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2496 rt->rt6i_flags |= RTF_ANYCAST;
2498 rt->rt6i_flags |= RTF_LOCAL;
2500 rt->rt6i_gateway = *addr;
2501 rt->rt6i_dst.addr = *addr;
2502 rt->rt6i_dst.plen = 128;
2503 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2504 rt->rt6i_table = fib6_get_table(net, tb_id);
2505 rt->dst.flags |= DST_NOCACHE;
2507 atomic_set(&rt->dst.__refcnt, 1);
2512 int ip6_route_get_saddr(struct net *net,
2513 struct rt6_info *rt,
2514 const struct in6_addr *daddr,
2516 struct in6_addr *saddr)
2518 struct inet6_dev *idev =
2519 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
2521 if (rt && rt->rt6i_prefsrc.plen)
2522 *saddr = rt->rt6i_prefsrc.addr;
2524 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2525 daddr, prefs, saddr);
2529 /* remove deleted ip from prefsrc entries */
2530 struct arg_dev_net_ip {
2531 struct net_device *dev;
2533 struct in6_addr *addr;
2536 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2538 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2539 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2540 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2542 if (((void *)rt->dst.dev == dev || !dev) &&
2543 rt != net->ipv6.ip6_null_entry &&
2544 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2545 /* remove prefsrc entry */
2546 rt->rt6i_prefsrc.plen = 0;
2551 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2553 struct net *net = dev_net(ifp->idev->dev);
2554 struct arg_dev_net_ip adni = {
2555 .dev = ifp->idev->dev,
2559 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2562 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2563 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2565 /* Remove routers and update dst entries when gateway turn into host. */
2566 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2568 struct in6_addr *gateway = (struct in6_addr *)arg;
2570 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2571 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2572 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2578 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2580 fib6_clean_all(net, fib6_clean_tohost, gateway);
2583 struct arg_dev_net {
2584 struct net_device *dev;
2588 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2590 const struct arg_dev_net *adn = arg;
2591 const struct net_device *dev = adn->dev;
2593 if ((rt->dst.dev == dev || !dev) &&
2594 rt != adn->net->ipv6.ip6_null_entry)
2600 void rt6_ifdown(struct net *net, struct net_device *dev)
2602 struct arg_dev_net adn = {
2607 fib6_clean_all(net, fib6_ifdown, &adn);
2608 icmp6_clean_all(fib6_ifdown, &adn);
2610 rt6_uncached_list_flush_dev(net, dev);
2613 struct rt6_mtu_change_arg {
2614 struct net_device *dev;
2618 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2620 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2621 struct inet6_dev *idev;
2623 /* In IPv6 pmtu discovery is not optional,
2624 so that RTAX_MTU lock cannot disable it.
2625 We still use this lock to block changes
2626 caused by addrconf/ndisc.
2629 idev = __in6_dev_get(arg->dev);
2633 /* For administrative MTU increase, there is no way to discover
2634 IPv6 PMTU increase, so PMTU increase should be updated here.
2635 Since RFC 1981 doesn't include administrative MTU increase
2636 update PMTU increase is a MUST. (i.e. jumbo frame)
2639 If new MTU is less than route PMTU, this new MTU will be the
2640 lowest MTU in the path, update the route PMTU to reflect PMTU
2641 decreases; if new MTU is greater than route PMTU, and the
2642 old MTU is the lowest MTU in the path, update the route PMTU
2643 to reflect the increase. In this case if the other nodes' MTU
2644 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2647 if (rt->dst.dev == arg->dev &&
2648 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2649 if (rt->rt6i_flags & RTF_CACHE) {
2650 /* For RTF_CACHE with rt6i_pmtu == 0
2651 * (i.e. a redirected route),
2652 * the metrics of its rt->dst.from has already
2655 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2656 rt->rt6i_pmtu = arg->mtu;
2657 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2658 (dst_mtu(&rt->dst) < arg->mtu &&
2659 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2660 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2666 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2668 struct rt6_mtu_change_arg arg = {
2673 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2676 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2677 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2678 [RTA_OIF] = { .type = NLA_U32 },
2679 [RTA_IIF] = { .type = NLA_U32 },
2680 [RTA_PRIORITY] = { .type = NLA_U32 },
2681 [RTA_METRICS] = { .type = NLA_NESTED },
2682 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2683 [RTA_PREF] = { .type = NLA_U8 },
2684 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2685 [RTA_ENCAP] = { .type = NLA_NESTED },
2688 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2689 struct fib6_config *cfg)
2692 struct nlattr *tb[RTA_MAX+1];
2696 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2701 rtm = nlmsg_data(nlh);
2702 memset(cfg, 0, sizeof(*cfg));
2704 cfg->fc_table = rtm->rtm_table;
2705 cfg->fc_dst_len = rtm->rtm_dst_len;
2706 cfg->fc_src_len = rtm->rtm_src_len;
2707 cfg->fc_flags = RTF_UP;
2708 cfg->fc_protocol = rtm->rtm_protocol;
2709 cfg->fc_type = rtm->rtm_type;
2711 if (rtm->rtm_type == RTN_UNREACHABLE ||
2712 rtm->rtm_type == RTN_BLACKHOLE ||
2713 rtm->rtm_type == RTN_PROHIBIT ||
2714 rtm->rtm_type == RTN_THROW)
2715 cfg->fc_flags |= RTF_REJECT;
2717 if (rtm->rtm_type == RTN_LOCAL)
2718 cfg->fc_flags |= RTF_LOCAL;
2720 if (rtm->rtm_flags & RTM_F_CLONED)
2721 cfg->fc_flags |= RTF_CACHE;
2723 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2724 cfg->fc_nlinfo.nlh = nlh;
2725 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2727 if (tb[RTA_GATEWAY]) {
2728 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2729 cfg->fc_flags |= RTF_GATEWAY;
2733 int plen = (rtm->rtm_dst_len + 7) >> 3;
2735 if (nla_len(tb[RTA_DST]) < plen)
2738 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2742 int plen = (rtm->rtm_src_len + 7) >> 3;
2744 if (nla_len(tb[RTA_SRC]) < plen)
2747 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2750 if (tb[RTA_PREFSRC])
2751 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2754 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2756 if (tb[RTA_PRIORITY])
2757 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2759 if (tb[RTA_METRICS]) {
2760 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2761 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2765 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2767 if (tb[RTA_MULTIPATH]) {
2768 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2769 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2773 pref = nla_get_u8(tb[RTA_PREF]);
2774 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2775 pref != ICMPV6_ROUTER_PREF_HIGH)
2776 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2777 cfg->fc_flags |= RTF_PREF(pref);
2781 cfg->fc_encap = tb[RTA_ENCAP];
2783 if (tb[RTA_ENCAP_TYPE])
2784 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2792 struct rt6_info *rt6_info;
2793 struct fib6_config r_cfg;
2794 struct mx6_config mxc;
2795 struct list_head next;
2798 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2802 list_for_each_entry(nh, rt6_nh_list, next) {
2803 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2804 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2805 nh->r_cfg.fc_ifindex);
2809 static int ip6_route_info_append(struct list_head *rt6_nh_list,
2810 struct rt6_info *rt, struct fib6_config *r_cfg)
2813 struct rt6_info *rtnh;
2816 list_for_each_entry(nh, rt6_nh_list, next) {
2817 /* check if rt6_info already exists */
2818 rtnh = nh->rt6_info;
2820 if (rtnh->dst.dev == rt->dst.dev &&
2821 rtnh->rt6i_idev == rt->rt6i_idev &&
2822 ipv6_addr_equal(&rtnh->rt6i_gateway,
2827 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2831 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2836 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2837 list_add_tail(&nh->next, rt6_nh_list);
2842 static int ip6_route_multipath_add(struct fib6_config *cfg)
2844 struct fib6_config r_cfg;
2845 struct rtnexthop *rtnh;
2846 struct rt6_info *rt;
2847 struct rt6_nh *err_nh;
2848 struct rt6_nh *nh, *nh_safe;
2853 int replace = (cfg->fc_nlinfo.nlh &&
2854 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2855 LIST_HEAD(rt6_nh_list);
2857 remaining = cfg->fc_mp_len;
2858 rtnh = (struct rtnexthop *)cfg->fc_mp;
2860 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2861 * rt6_info structs per nexthop
2863 while (rtnh_ok(rtnh, remaining)) {
2864 memcpy(&r_cfg, cfg, sizeof(*cfg));
2865 if (rtnh->rtnh_ifindex)
2866 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2868 attrlen = rtnh_attrlen(rtnh);
2870 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2872 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2874 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2875 r_cfg.fc_flags |= RTF_GATEWAY;
2877 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2878 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2880 r_cfg.fc_encap_type = nla_get_u16(nla);
2883 rt = ip6_route_info_create(&r_cfg);
2890 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
2896 rtnh = rtnh_next(rtnh, &remaining);
2900 list_for_each_entry(nh, &rt6_nh_list, next) {
2901 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2902 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2903 nh->rt6_info = NULL;
2906 ip6_print_replace_route_err(&rt6_nh_list);
2911 /* Because each route is added like a single route we remove
2912 * these flags after the first nexthop: if there is a collision,
2913 * we have already failed to add the first nexthop:
2914 * fib6_add_rt2node() has rejected it; when replacing, old
2915 * nexthops have been replaced by first new, the rest should
2918 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2926 /* Delete routes that were already added */
2927 list_for_each_entry(nh, &rt6_nh_list, next) {
2930 ip6_route_del(&nh->r_cfg);
2934 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
2936 dst_free(&nh->rt6_info->dst);
2938 list_del(&nh->next);
2945 static int ip6_route_multipath_del(struct fib6_config *cfg)
2947 struct fib6_config r_cfg;
2948 struct rtnexthop *rtnh;
2951 int err = 1, last_err = 0;
2953 remaining = cfg->fc_mp_len;
2954 rtnh = (struct rtnexthop *)cfg->fc_mp;
2956 /* Parse a Multipath Entry */
2957 while (rtnh_ok(rtnh, remaining)) {
2958 memcpy(&r_cfg, cfg, sizeof(*cfg));
2959 if (rtnh->rtnh_ifindex)
2960 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2962 attrlen = rtnh_attrlen(rtnh);
2964 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2966 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2968 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2969 r_cfg.fc_flags |= RTF_GATEWAY;
2972 err = ip6_route_del(&r_cfg);
2976 rtnh = rtnh_next(rtnh, &remaining);
2982 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2984 struct fib6_config cfg;
2987 err = rtm_to_fib6_config(skb, nlh, &cfg);
2992 return ip6_route_multipath_del(&cfg);
2994 return ip6_route_del(&cfg);
2997 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2999 struct fib6_config cfg;
3002 err = rtm_to_fib6_config(skb, nlh, &cfg);
3007 return ip6_route_multipath_add(&cfg);
3009 return ip6_route_add(&cfg);
3012 static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
3014 return NLMSG_ALIGN(sizeof(struct rtmsg))
3015 + nla_total_size(16) /* RTA_SRC */
3016 + nla_total_size(16) /* RTA_DST */
3017 + nla_total_size(16) /* RTA_GATEWAY */
3018 + nla_total_size(16) /* RTA_PREFSRC */
3019 + nla_total_size(4) /* RTA_TABLE */
3020 + nla_total_size(4) /* RTA_IIF */
3021 + nla_total_size(4) /* RTA_OIF */
3022 + nla_total_size(4) /* RTA_PRIORITY */
3023 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3024 + nla_total_size(sizeof(struct rta_cacheinfo))
3025 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3026 + nla_total_size(1) /* RTA_PREF */
3027 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3030 static int rt6_fill_node(struct net *net,
3031 struct sk_buff *skb, struct rt6_info *rt,
3032 struct in6_addr *dst, struct in6_addr *src,
3033 int iif, int type, u32 portid, u32 seq,
3034 int prefix, int nowait, unsigned int flags)
3036 u32 metrics[RTAX_MAX];
3038 struct nlmsghdr *nlh;
3042 if (prefix) { /* user wants prefix routes only */
3043 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3044 /* success since this is not a prefix route */
3049 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3053 rtm = nlmsg_data(nlh);
3054 rtm->rtm_family = AF_INET6;
3055 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3056 rtm->rtm_src_len = rt->rt6i_src.plen;
3059 table = rt->rt6i_table->tb6_id;
3061 table = RT6_TABLE_UNSPEC;
3062 rtm->rtm_table = table;
3063 if (nla_put_u32(skb, RTA_TABLE, table))
3064 goto nla_put_failure;
3065 if (rt->rt6i_flags & RTF_REJECT) {
3066 switch (rt->dst.error) {
3068 rtm->rtm_type = RTN_BLACKHOLE;
3071 rtm->rtm_type = RTN_PROHIBIT;
3074 rtm->rtm_type = RTN_THROW;
3077 rtm->rtm_type = RTN_UNREACHABLE;
3081 else if (rt->rt6i_flags & RTF_LOCAL)
3082 rtm->rtm_type = RTN_LOCAL;
3083 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3084 rtm->rtm_type = RTN_LOCAL;
3086 rtm->rtm_type = RTN_UNICAST;
3088 if (!netif_carrier_ok(rt->dst.dev)) {
3089 rtm->rtm_flags |= RTNH_F_LINKDOWN;
3090 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3091 rtm->rtm_flags |= RTNH_F_DEAD;
3093 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3094 rtm->rtm_protocol = rt->rt6i_protocol;
3095 if (rt->rt6i_flags & RTF_DYNAMIC)
3096 rtm->rtm_protocol = RTPROT_REDIRECT;
3097 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3098 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3099 rtm->rtm_protocol = RTPROT_RA;
3101 rtm->rtm_protocol = RTPROT_KERNEL;
3104 if (rt->rt6i_flags & RTF_CACHE)
3105 rtm->rtm_flags |= RTM_F_CLONED;
3108 if (nla_put_in6_addr(skb, RTA_DST, dst))
3109 goto nla_put_failure;
3110 rtm->rtm_dst_len = 128;
3111 } else if (rtm->rtm_dst_len)
3112 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3113 goto nla_put_failure;
3114 #ifdef CONFIG_IPV6_SUBTREES
3116 if (nla_put_in6_addr(skb, RTA_SRC, src))
3117 goto nla_put_failure;
3118 rtm->rtm_src_len = 128;
3119 } else if (rtm->rtm_src_len &&
3120 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3121 goto nla_put_failure;
3124 #ifdef CONFIG_IPV6_MROUTE
3125 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3126 int err = ip6mr_get_route(net, skb, rtm, nowait);
3131 goto nla_put_failure;
3133 if (err == -EMSGSIZE)
3134 goto nla_put_failure;
3139 if (nla_put_u32(skb, RTA_IIF, iif))
3140 goto nla_put_failure;
3142 struct in6_addr saddr_buf;
3143 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3144 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3145 goto nla_put_failure;
3148 if (rt->rt6i_prefsrc.plen) {
3149 struct in6_addr saddr_buf;
3150 saddr_buf = rt->rt6i_prefsrc.addr;
3151 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3152 goto nla_put_failure;
3155 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3157 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3158 if (rtnetlink_put_metrics(skb, metrics) < 0)
3159 goto nla_put_failure;
3161 if (rt->rt6i_flags & RTF_GATEWAY) {
3162 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3163 goto nla_put_failure;
3167 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3168 goto nla_put_failure;
3169 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3170 goto nla_put_failure;
3172 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3174 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3175 goto nla_put_failure;
3177 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3178 goto nla_put_failure;
3180 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
3182 nlmsg_end(skb, nlh);
3186 nlmsg_cancel(skb, nlh);
3190 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3192 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3195 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3196 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3197 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3201 return rt6_fill_node(arg->net,
3202 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3203 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3204 prefix, 0, NLM_F_MULTI);
3207 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3209 struct net *net = sock_net(in_skb->sk);
3210 struct nlattr *tb[RTA_MAX+1];
3211 struct rt6_info *rt;
3212 struct sk_buff *skb;
3215 int err, iif = 0, oif = 0;
3217 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3222 memset(&fl6, 0, sizeof(fl6));
3225 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3228 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3232 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3235 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3239 iif = nla_get_u32(tb[RTA_IIF]);
3242 oif = nla_get_u32(tb[RTA_OIF]);
3245 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3248 struct net_device *dev;
3251 dev = __dev_get_by_index(net, iif);
3257 fl6.flowi6_iif = iif;
3259 if (!ipv6_addr_any(&fl6.saddr))
3260 flags |= RT6_LOOKUP_F_HAS_SADDR;
3262 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3265 fl6.flowi6_oif = oif;
3267 if (netif_index_is_l3_master(net, oif)) {
3268 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3269 FLOWI_FLAG_SKIP_NH_OIF;
3272 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3275 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3282 /* Reserve room for dummy headers, this skb can pass
3283 through good chunk of routing engine.
3285 skb_reset_mac_header(skb);
3286 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3288 skb_dst_set(skb, &rt->dst);
3290 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3291 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3292 nlh->nlmsg_seq, 0, 0, 0);
3298 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3303 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3304 unsigned int nlm_flags)
3306 struct sk_buff *skb;
3307 struct net *net = info->nl_net;
3312 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3314 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3318 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3319 event, info->portid, seq, 0, 0, nlm_flags);
3321 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3322 WARN_ON(err == -EMSGSIZE);
3326 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3327 info->nlh, gfp_any());
3331 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3334 static int ip6_route_dev_notify(struct notifier_block *this,
3335 unsigned long event, void *ptr)
3337 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3338 struct net *net = dev_net(dev);
3340 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3341 net->ipv6.ip6_null_entry->dst.dev = dev;
3342 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3343 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3344 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3345 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3346 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3347 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3358 #ifdef CONFIG_PROC_FS
3360 static const struct file_operations ipv6_route_proc_fops = {
3361 .owner = THIS_MODULE,
3362 .open = ipv6_route_open,
3364 .llseek = seq_lseek,
3365 .release = seq_release_net,
3368 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3370 struct net *net = (struct net *)seq->private;
3371 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3372 net->ipv6.rt6_stats->fib_nodes,
3373 net->ipv6.rt6_stats->fib_route_nodes,
3374 net->ipv6.rt6_stats->fib_rt_alloc,
3375 net->ipv6.rt6_stats->fib_rt_entries,
3376 net->ipv6.rt6_stats->fib_rt_cache,
3377 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3378 net->ipv6.rt6_stats->fib_discarded_routes);
3383 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3385 return single_open_net(inode, file, rt6_stats_seq_show);
3388 static const struct file_operations rt6_stats_seq_fops = {
3389 .owner = THIS_MODULE,
3390 .open = rt6_stats_seq_open,
3392 .llseek = seq_lseek,
3393 .release = single_release_net,
3395 #endif /* CONFIG_PROC_FS */
3397 #ifdef CONFIG_SYSCTL
3400 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3401 void __user *buffer, size_t *lenp, loff_t *ppos)
3408 net = (struct net *)ctl->extra1;
3409 delay = net->ipv6.sysctl.flush_delay;
3410 proc_dointvec(ctl, write, buffer, lenp, ppos);
3411 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3415 struct ctl_table ipv6_route_table_template[] = {
3417 .procname = "flush",
3418 .data = &init_net.ipv6.sysctl.flush_delay,
3419 .maxlen = sizeof(int),
3421 .proc_handler = ipv6_sysctl_rtcache_flush
3424 .procname = "gc_thresh",
3425 .data = &ip6_dst_ops_template.gc_thresh,
3426 .maxlen = sizeof(int),
3428 .proc_handler = proc_dointvec,
3431 .procname = "max_size",
3432 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3433 .maxlen = sizeof(int),
3435 .proc_handler = proc_dointvec,
3438 .procname = "gc_min_interval",
3439 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3440 .maxlen = sizeof(int),
3442 .proc_handler = proc_dointvec_jiffies,
3445 .procname = "gc_timeout",
3446 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3447 .maxlen = sizeof(int),
3449 .proc_handler = proc_dointvec_jiffies,
3452 .procname = "gc_interval",
3453 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3454 .maxlen = sizeof(int),
3456 .proc_handler = proc_dointvec_jiffies,
3459 .procname = "gc_elasticity",
3460 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3461 .maxlen = sizeof(int),
3463 .proc_handler = proc_dointvec,
3466 .procname = "mtu_expires",
3467 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3468 .maxlen = sizeof(int),
3470 .proc_handler = proc_dointvec_jiffies,
3473 .procname = "min_adv_mss",
3474 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3475 .maxlen = sizeof(int),
3477 .proc_handler = proc_dointvec,
3480 .procname = "gc_min_interval_ms",
3481 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3482 .maxlen = sizeof(int),
3484 .proc_handler = proc_dointvec_ms_jiffies,
3489 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3491 struct ctl_table *table;
3493 table = kmemdup(ipv6_route_table_template,
3494 sizeof(ipv6_route_table_template),
3498 table[0].data = &net->ipv6.sysctl.flush_delay;
3499 table[0].extra1 = net;
3500 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3501 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3502 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3503 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3504 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3505 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3506 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3507 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3508 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3510 /* Don't export sysctls to unprivileged users */
3511 if (net->user_ns != &init_user_ns)
3512 table[0].procname = NULL;
3519 static int __net_init ip6_route_net_init(struct net *net)
3523 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3524 sizeof(net->ipv6.ip6_dst_ops));
3526 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3527 goto out_ip6_dst_ops;
3529 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3530 sizeof(*net->ipv6.ip6_null_entry),
3532 if (!net->ipv6.ip6_null_entry)
3533 goto out_ip6_dst_entries;
3534 net->ipv6.ip6_null_entry->dst.path =
3535 (struct dst_entry *)net->ipv6.ip6_null_entry;
3536 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3537 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3538 ip6_template_metrics, true);
3540 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3541 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3542 sizeof(*net->ipv6.ip6_prohibit_entry),
3544 if (!net->ipv6.ip6_prohibit_entry)
3545 goto out_ip6_null_entry;
3546 net->ipv6.ip6_prohibit_entry->dst.path =
3547 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3548 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3549 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3550 ip6_template_metrics, true);
3552 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3553 sizeof(*net->ipv6.ip6_blk_hole_entry),
3555 if (!net->ipv6.ip6_blk_hole_entry)
3556 goto out_ip6_prohibit_entry;
3557 net->ipv6.ip6_blk_hole_entry->dst.path =
3558 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3559 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3560 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3561 ip6_template_metrics, true);
3564 net->ipv6.sysctl.flush_delay = 0;
3565 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3566 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3567 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3568 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3569 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3570 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3571 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3573 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3579 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3580 out_ip6_prohibit_entry:
3581 kfree(net->ipv6.ip6_prohibit_entry);
3583 kfree(net->ipv6.ip6_null_entry);
3585 out_ip6_dst_entries:
3586 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3591 static void __net_exit ip6_route_net_exit(struct net *net)
3593 kfree(net->ipv6.ip6_null_entry);
3594 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3595 kfree(net->ipv6.ip6_prohibit_entry);
3596 kfree(net->ipv6.ip6_blk_hole_entry);
3598 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3601 static int __net_init ip6_route_net_init_late(struct net *net)
3603 #ifdef CONFIG_PROC_FS
3604 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3605 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3610 static void __net_exit ip6_route_net_exit_late(struct net *net)
3612 #ifdef CONFIG_PROC_FS
3613 remove_proc_entry("ipv6_route", net->proc_net);
3614 remove_proc_entry("rt6_stats", net->proc_net);
3618 static struct pernet_operations ip6_route_net_ops = {
3619 .init = ip6_route_net_init,
3620 .exit = ip6_route_net_exit,
3623 static int __net_init ipv6_inetpeer_init(struct net *net)
3625 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3629 inet_peer_base_init(bp);
3630 net->ipv6.peers = bp;
3634 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3636 struct inet_peer_base *bp = net->ipv6.peers;
3638 net->ipv6.peers = NULL;
3639 inetpeer_invalidate_tree(bp);
3643 static struct pernet_operations ipv6_inetpeer_ops = {
3644 .init = ipv6_inetpeer_init,
3645 .exit = ipv6_inetpeer_exit,
3648 static struct pernet_operations ip6_route_net_late_ops = {
3649 .init = ip6_route_net_init_late,
3650 .exit = ip6_route_net_exit_late,
3653 static struct notifier_block ip6_route_dev_notifier = {
3654 .notifier_call = ip6_route_dev_notify,
3658 int __init ip6_route_init(void)
3664 ip6_dst_ops_template.kmem_cachep =
3665 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3666 SLAB_HWCACHE_ALIGN, NULL);
3667 if (!ip6_dst_ops_template.kmem_cachep)
3670 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3672 goto out_kmem_cache;
3674 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3676 goto out_dst_entries;
3678 ret = register_pernet_subsys(&ip6_route_net_ops);
3680 goto out_register_inetpeer;
3682 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3684 /* Registering of the loopback is done before this portion of code,
3685 * the loopback reference in rt6_info will not be taken, do it
3686 * manually for init_net */
3687 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3688 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3689 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3690 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3691 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3692 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3693 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3697 goto out_register_subsys;
3703 ret = fib6_rules_init();
3707 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3709 goto fib6_rules_init;
3712 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3713 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3714 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3715 goto out_register_late_subsys;
3717 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3719 goto out_register_late_subsys;
3721 for_each_possible_cpu(cpu) {
3722 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3724 INIT_LIST_HEAD(&ul->head);
3725 spin_lock_init(&ul->lock);
3731 out_register_late_subsys:
3732 unregister_pernet_subsys(&ip6_route_net_late_ops);
3734 fib6_rules_cleanup();
3739 out_register_subsys:
3740 unregister_pernet_subsys(&ip6_route_net_ops);
3741 out_register_inetpeer:
3742 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3744 dst_entries_destroy(&ip6_dst_blackhole_ops);
3746 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3750 void ip6_route_cleanup(void)
3752 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3753 unregister_pernet_subsys(&ip6_route_net_late_ops);
3754 fib6_rules_cleanup();
3757 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3758 unregister_pernet_subsys(&ip6_route_net_ops);
3759 dst_entries_destroy(&ip6_dst_blackhole_ops);
3760 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);