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_device *dev,
103 const struct in6_addr *prefix, int prefixlen,
104 const struct in6_addr *gwaddr, unsigned int pref);
105 static struct rt6_info *rt6_get_route_info(struct net_device *dev,
106 const struct in6_addr *prefix, int prefixlen,
107 const struct in6_addr *gwaddr);
110 struct uncached_list {
112 struct list_head head;
115 static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
117 static void rt6_uncached_list_add(struct rt6_info *rt)
119 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
121 rt->dst.flags |= DST_NOCACHE;
122 rt->rt6i_uncached_list = ul;
124 spin_lock_bh(&ul->lock);
125 list_add_tail(&rt->rt6i_uncached, &ul->head);
126 spin_unlock_bh(&ul->lock);
129 static void rt6_uncached_list_del(struct rt6_info *rt)
131 if (!list_empty(&rt->rt6i_uncached)) {
132 struct uncached_list *ul = rt->rt6i_uncached_list;
134 spin_lock_bh(&ul->lock);
135 list_del(&rt->rt6i_uncached);
136 spin_unlock_bh(&ul->lock);
140 static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
142 struct net_device *loopback_dev = net->loopback_dev;
145 if (dev == loopback_dev)
148 for_each_possible_cpu(cpu) {
149 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
152 spin_lock_bh(&ul->lock);
153 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
154 struct inet6_dev *rt_idev = rt->rt6i_idev;
155 struct net_device *rt_dev = rt->dst.dev;
157 if (rt_idev->dev == dev) {
158 rt->rt6i_idev = in6_dev_get(loopback_dev);
159 in6_dev_put(rt_idev);
163 rt->dst.dev = loopback_dev;
164 dev_hold(rt->dst.dev);
168 spin_unlock_bh(&ul->lock);
172 static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
174 return dst_metrics_write_ptr(rt->dst.from);
177 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
179 struct rt6_info *rt = (struct rt6_info *)dst;
181 if (rt->rt6i_flags & RTF_PCPU)
182 return rt6_pcpu_cow_metrics(rt);
183 else if (rt->rt6i_flags & RTF_CACHE)
186 return dst_cow_metrics_generic(dst, old);
189 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
193 struct in6_addr *p = &rt->rt6i_gateway;
195 if (!ipv6_addr_any(p))
196 return (const void *) p;
198 return &ipv6_hdr(skb)->daddr;
202 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
206 struct rt6_info *rt = (struct rt6_info *) dst;
209 daddr = choose_neigh_daddr(rt, skb, daddr);
210 n = __ipv6_neigh_lookup(dst->dev, daddr);
213 return neigh_create(&nd_tbl, daddr, dst->dev);
216 static struct dst_ops ip6_dst_ops_template = {
220 .check = ip6_dst_check,
221 .default_advmss = ip6_default_advmss,
223 .cow_metrics = ipv6_cow_metrics,
224 .destroy = ip6_dst_destroy,
225 .ifdown = ip6_dst_ifdown,
226 .negative_advice = ip6_negative_advice,
227 .link_failure = ip6_link_failure,
228 .update_pmtu = ip6_rt_update_pmtu,
229 .redirect = rt6_do_redirect,
230 .local_out = __ip6_local_out,
231 .neigh_lookup = ip6_neigh_lookup,
234 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
236 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
238 return mtu ? : dst->dev->mtu;
241 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
242 struct sk_buff *skb, u32 mtu)
246 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
251 static struct dst_ops ip6_dst_blackhole_ops = {
253 .destroy = ip6_dst_destroy,
254 .check = ip6_dst_check,
255 .mtu = ip6_blackhole_mtu,
256 .default_advmss = ip6_default_advmss,
257 .update_pmtu = ip6_rt_blackhole_update_pmtu,
258 .redirect = ip6_rt_blackhole_redirect,
259 .cow_metrics = dst_cow_metrics_generic,
260 .neigh_lookup = ip6_neigh_lookup,
263 static const u32 ip6_template_metrics[RTAX_MAX] = {
264 [RTAX_HOPLIMIT - 1] = 0,
267 static const struct rt6_info ip6_null_entry_template = {
269 .__refcnt = ATOMIC_INIT(1),
271 .obsolete = DST_OBSOLETE_FORCE_CHK,
272 .error = -ENETUNREACH,
273 .input = ip6_pkt_discard,
274 .output = ip6_pkt_discard_out,
276 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
277 .rt6i_protocol = RTPROT_KERNEL,
278 .rt6i_metric = ~(u32) 0,
279 .rt6i_ref = ATOMIC_INIT(1),
282 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
284 static const struct rt6_info ip6_prohibit_entry_template = {
286 .__refcnt = ATOMIC_INIT(1),
288 .obsolete = DST_OBSOLETE_FORCE_CHK,
290 .input = ip6_pkt_prohibit,
291 .output = ip6_pkt_prohibit_out,
293 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
294 .rt6i_protocol = RTPROT_KERNEL,
295 .rt6i_metric = ~(u32) 0,
296 .rt6i_ref = ATOMIC_INIT(1),
299 static const struct rt6_info ip6_blk_hole_entry_template = {
301 .__refcnt = ATOMIC_INIT(1),
303 .obsolete = DST_OBSOLETE_FORCE_CHK,
305 .input = dst_discard,
306 .output = dst_discard_out,
308 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
309 .rt6i_protocol = RTPROT_KERNEL,
310 .rt6i_metric = ~(u32) 0,
311 .rt6i_ref = ATOMIC_INIT(1),
316 static void rt6_info_init(struct rt6_info *rt)
318 struct dst_entry *dst = &rt->dst;
320 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
321 INIT_LIST_HEAD(&rt->rt6i_siblings);
322 INIT_LIST_HEAD(&rt->rt6i_uncached);
325 /* allocate dst with ip6_dst_ops */
326 static struct rt6_info *__ip6_dst_alloc(struct net *net,
327 struct net_device *dev,
330 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
331 0, DST_OBSOLETE_FORCE_CHK, flags);
339 static struct rt6_info *ip6_dst_alloc(struct net *net,
340 struct net_device *dev,
343 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
346 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
350 for_each_possible_cpu(cpu) {
353 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
354 /* no one shares rt */
358 dst_destroy((struct dst_entry *)rt);
366 static void ip6_dst_destroy(struct dst_entry *dst)
368 struct rt6_info *rt = (struct rt6_info *)dst;
369 struct dst_entry *from = dst->from;
370 struct inet6_dev *idev;
372 dst_destroy_metrics_generic(dst);
373 free_percpu(rt->rt6i_pcpu);
374 rt6_uncached_list_del(rt);
376 idev = rt->rt6i_idev;
378 rt->rt6i_idev = NULL;
386 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
389 struct rt6_info *rt = (struct rt6_info *)dst;
390 struct inet6_dev *idev = rt->rt6i_idev;
391 struct net_device *loopback_dev =
392 dev_net(dev)->loopback_dev;
394 if (dev != loopback_dev) {
395 if (idev && idev->dev == dev) {
396 struct inet6_dev *loopback_idev =
397 in6_dev_get(loopback_dev);
399 rt->rt6i_idev = loopback_idev;
406 static bool __rt6_check_expired(const struct rt6_info *rt)
408 if (rt->rt6i_flags & RTF_EXPIRES)
409 return time_after(jiffies, rt->dst.expires);
414 static bool rt6_check_expired(const struct rt6_info *rt)
416 if (rt->rt6i_flags & RTF_EXPIRES) {
417 if (time_after(jiffies, rt->dst.expires))
419 } else if (rt->dst.from) {
420 return rt6_check_expired((struct rt6_info *) rt->dst.from);
425 /* Multipath route selection:
426 * Hash based function using packet header and flowlabel.
427 * Adapted from fib_info_hashfn()
429 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
430 const struct flowi6 *fl6)
432 return get_hash_from_flowi6(fl6) % candidate_count;
435 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
436 struct flowi6 *fl6, int oif,
439 struct rt6_info *sibling, *next_sibling;
442 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
443 /* Don't change the route, if route_choosen == 0
444 * (siblings does not include ourself)
447 list_for_each_entry_safe(sibling, next_sibling,
448 &match->rt6i_siblings, rt6i_siblings) {
450 if (route_choosen == 0) {
451 if (rt6_score_route(sibling, oif, strict) < 0)
461 * Route lookup. Any table->tb6_lock is implied.
464 static inline struct rt6_info *rt6_device_match(struct net *net,
466 const struct in6_addr *saddr,
470 struct rt6_info *local = NULL;
471 struct rt6_info *sprt;
473 if (!oif && ipv6_addr_any(saddr))
476 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
477 struct net_device *dev = sprt->dst.dev;
480 if (dev->ifindex == oif)
482 if (dev->flags & IFF_LOOPBACK) {
483 if (!sprt->rt6i_idev ||
484 sprt->rt6i_idev->dev->ifindex != oif) {
485 if (flags & RT6_LOOKUP_F_IFACE)
488 local->rt6i_idev->dev->ifindex == oif)
494 if (ipv6_chk_addr(net, saddr, dev,
495 flags & RT6_LOOKUP_F_IFACE))
504 if (flags & RT6_LOOKUP_F_IFACE)
505 return net->ipv6.ip6_null_entry;
511 #ifdef CONFIG_IPV6_ROUTER_PREF
512 struct __rt6_probe_work {
513 struct work_struct work;
514 struct in6_addr target;
515 struct net_device *dev;
518 static void rt6_probe_deferred(struct work_struct *w)
520 struct in6_addr mcaddr;
521 struct __rt6_probe_work *work =
522 container_of(w, struct __rt6_probe_work, work);
524 addrconf_addr_solict_mult(&work->target, &mcaddr);
525 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL);
530 static void rt6_probe(struct rt6_info *rt)
532 struct __rt6_probe_work *work;
533 struct neighbour *neigh;
535 * Okay, this does not seem to be appropriate
536 * for now, however, we need to check if it
537 * is really so; aka Router Reachability Probing.
539 * Router Reachability Probe MUST be rate-limited
540 * to no more than one per minute.
542 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
545 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
547 if (neigh->nud_state & NUD_VALID)
551 write_lock(&neigh->lock);
552 if (!(neigh->nud_state & NUD_VALID) &&
555 rt->rt6i_idev->cnf.rtr_probe_interval)) {
556 work = kmalloc(sizeof(*work), GFP_ATOMIC);
558 __neigh_set_probe_once(neigh);
560 write_unlock(&neigh->lock);
562 work = kmalloc(sizeof(*work), GFP_ATOMIC);
566 INIT_WORK(&work->work, rt6_probe_deferred);
567 work->target = rt->rt6i_gateway;
568 dev_hold(rt->dst.dev);
569 work->dev = rt->dst.dev;
570 schedule_work(&work->work);
574 rcu_read_unlock_bh();
577 static inline void rt6_probe(struct rt6_info *rt)
583 * Default Router Selection (RFC 2461 6.3.6)
585 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
587 struct net_device *dev = rt->dst.dev;
588 if (!oif || dev->ifindex == oif)
590 if ((dev->flags & IFF_LOOPBACK) &&
591 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
596 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
598 struct neighbour *neigh;
599 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
601 if (rt->rt6i_flags & RTF_NONEXTHOP ||
602 !(rt->rt6i_flags & RTF_GATEWAY))
603 return RT6_NUD_SUCCEED;
606 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
608 read_lock(&neigh->lock);
609 if (neigh->nud_state & NUD_VALID)
610 ret = RT6_NUD_SUCCEED;
611 #ifdef CONFIG_IPV6_ROUTER_PREF
612 else if (!(neigh->nud_state & NUD_FAILED))
613 ret = RT6_NUD_SUCCEED;
615 ret = RT6_NUD_FAIL_PROBE;
617 read_unlock(&neigh->lock);
619 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
620 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
622 rcu_read_unlock_bh();
627 static int rt6_score_route(struct rt6_info *rt, int oif,
632 m = rt6_check_dev(rt, oif);
633 if (!m && (strict & RT6_LOOKUP_F_IFACE))
634 return RT6_NUD_FAIL_HARD;
635 #ifdef CONFIG_IPV6_ROUTER_PREF
636 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
638 if (strict & RT6_LOOKUP_F_REACHABLE) {
639 int n = rt6_check_neigh(rt);
646 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
647 int *mpri, struct rt6_info *match,
651 bool match_do_rr = false;
652 struct inet6_dev *idev = rt->rt6i_idev;
653 struct net_device *dev = rt->dst.dev;
655 if (dev && !netif_carrier_ok(dev) &&
656 idev->cnf.ignore_routes_with_linkdown)
659 if (rt6_check_expired(rt))
662 m = rt6_score_route(rt, oif, strict);
663 if (m == RT6_NUD_FAIL_DO_RR) {
665 m = 0; /* lowest valid score */
666 } else if (m == RT6_NUD_FAIL_HARD) {
670 if (strict & RT6_LOOKUP_F_REACHABLE)
673 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
675 *do_rr = match_do_rr;
683 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
684 struct rt6_info *rr_head,
685 u32 metric, int oif, int strict,
688 struct rt6_info *rt, *match, *cont;
693 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
694 if (rt->rt6i_metric != metric) {
699 match = find_match(rt, oif, strict, &mpri, match, do_rr);
702 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
703 if (rt->rt6i_metric != metric) {
708 match = find_match(rt, oif, strict, &mpri, match, do_rr);
714 for (rt = cont; rt; rt = rt->dst.rt6_next)
715 match = find_match(rt, oif, strict, &mpri, match, do_rr);
720 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
722 struct rt6_info *match, *rt0;
728 fn->rr_ptr = rt0 = fn->leaf;
730 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
734 struct rt6_info *next = rt0->dst.rt6_next;
736 /* no entries matched; do round-robin */
737 if (!next || next->rt6i_metric != rt0->rt6i_metric)
744 net = dev_net(rt0->dst.dev);
745 return match ? match : net->ipv6.ip6_null_entry;
748 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
750 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
753 #ifdef CONFIG_IPV6_ROUTE_INFO
754 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
755 const struct in6_addr *gwaddr)
757 struct route_info *rinfo = (struct route_info *) opt;
758 struct in6_addr prefix_buf, *prefix;
760 unsigned long lifetime;
763 if (len < sizeof(struct route_info)) {
767 /* Sanity check for prefix_len and length */
768 if (rinfo->length > 3) {
770 } else if (rinfo->prefix_len > 128) {
772 } else if (rinfo->prefix_len > 64) {
773 if (rinfo->length < 2) {
776 } else if (rinfo->prefix_len > 0) {
777 if (rinfo->length < 1) {
782 pref = rinfo->route_pref;
783 if (pref == ICMPV6_ROUTER_PREF_INVALID)
786 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
788 if (rinfo->length == 3)
789 prefix = (struct in6_addr *)rinfo->prefix;
791 /* this function is safe */
792 ipv6_addr_prefix(&prefix_buf,
793 (struct in6_addr *)rinfo->prefix,
795 prefix = &prefix_buf;
798 if (rinfo->prefix_len == 0)
799 rt = rt6_get_dflt_router(gwaddr, dev);
801 rt = rt6_get_route_info(dev, prefix, rinfo->prefix_len, gwaddr);
803 if (rt && !lifetime) {
809 rt = rt6_add_route_info(dev, prefix, rinfo->prefix_len, gwaddr, pref);
811 rt->rt6i_flags = RTF_ROUTEINFO |
812 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
815 if (!addrconf_finite_timeout(lifetime))
816 rt6_clean_expires(rt);
818 rt6_set_expires(rt, jiffies + HZ * lifetime);
826 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
827 struct in6_addr *saddr)
829 struct fib6_node *pn;
831 if (fn->fn_flags & RTN_TL_ROOT)
834 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
835 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
838 if (fn->fn_flags & RTN_RTINFO)
843 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
844 struct fib6_table *table,
845 struct flowi6 *fl6, int flags)
847 struct fib6_node *fn;
850 read_lock_bh(&table->tb6_lock);
851 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
854 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
855 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
856 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
857 if (rt == net->ipv6.ip6_null_entry) {
858 fn = fib6_backtrack(fn, &fl6->saddr);
862 dst_use(&rt->dst, jiffies);
863 read_unlock_bh(&table->tb6_lock);
868 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
871 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
873 EXPORT_SYMBOL_GPL(ip6_route_lookup);
875 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
876 const struct in6_addr *saddr, int oif, int strict)
878 struct flowi6 fl6 = {
882 struct dst_entry *dst;
883 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
886 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
887 flags |= RT6_LOOKUP_F_HAS_SADDR;
890 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
892 return (struct rt6_info *) dst;
898 EXPORT_SYMBOL(rt6_lookup);
900 /* ip6_ins_rt is called with FREE table->tb6_lock.
901 It takes new route entry, the addition fails by any reason the
902 route is freed. In any case, if caller does not hold it, it may
906 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
907 struct mx6_config *mxc)
910 struct fib6_table *table;
912 table = rt->rt6i_table;
913 write_lock_bh(&table->tb6_lock);
914 err = fib6_add(&table->tb6_root, rt, info, mxc);
915 write_unlock_bh(&table->tb6_lock);
920 int ip6_ins_rt(struct rt6_info *rt)
922 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
923 struct mx6_config mxc = { .mx = NULL, };
925 return __ip6_ins_rt(rt, &info, &mxc);
928 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
929 const struct in6_addr *daddr,
930 const struct in6_addr *saddr)
938 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
939 ort = (struct rt6_info *)ort->dst.from;
941 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
946 ip6_rt_copy_init(rt, ort);
947 rt->rt6i_flags |= RTF_CACHE;
949 rt->dst.flags |= DST_HOST;
950 rt->rt6i_dst.addr = *daddr;
951 rt->rt6i_dst.plen = 128;
953 if (!rt6_is_gw_or_nonexthop(ort)) {
954 if (ort->rt6i_dst.plen != 128 &&
955 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
956 rt->rt6i_flags |= RTF_ANYCAST;
957 #ifdef CONFIG_IPV6_SUBTREES
958 if (rt->rt6i_src.plen && saddr) {
959 rt->rt6i_src.addr = *saddr;
960 rt->rt6i_src.plen = 128;
968 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
970 struct rt6_info *pcpu_rt;
972 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
973 rt->dst.dev, rt->dst.flags);
977 ip6_rt_copy_init(pcpu_rt, rt);
978 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
979 pcpu_rt->rt6i_flags |= RTF_PCPU;
983 /* It should be called with read_lock_bh(&tb6_lock) acquired */
984 static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
986 struct rt6_info *pcpu_rt, **p;
988 p = this_cpu_ptr(rt->rt6i_pcpu);
992 dst_hold(&pcpu_rt->dst);
993 rt6_dst_from_metrics_check(pcpu_rt);
998 static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1000 struct fib6_table *table = rt->rt6i_table;
1001 struct rt6_info *pcpu_rt, *prev, **p;
1003 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1005 struct net *net = dev_net(rt->dst.dev);
1007 dst_hold(&net->ipv6.ip6_null_entry->dst);
1008 return net->ipv6.ip6_null_entry;
1011 read_lock_bh(&table->tb6_lock);
1012 if (rt->rt6i_pcpu) {
1013 p = this_cpu_ptr(rt->rt6i_pcpu);
1014 prev = cmpxchg(p, NULL, pcpu_rt);
1016 /* If someone did it before us, return prev instead */
1017 dst_destroy(&pcpu_rt->dst);
1021 /* rt has been removed from the fib6 tree
1022 * before we have a chance to acquire the read_lock.
1023 * In this case, don't brother to create a pcpu rt
1024 * since rt is going away anyway. The next
1025 * dst_check() will trigger a re-lookup.
1027 dst_destroy(&pcpu_rt->dst);
1030 dst_hold(&pcpu_rt->dst);
1031 rt6_dst_from_metrics_check(pcpu_rt);
1032 read_unlock_bh(&table->tb6_lock);
1036 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
1037 struct flowi6 *fl6, int flags)
1039 struct fib6_node *fn, *saved_fn;
1040 struct rt6_info *rt;
1043 strict |= flags & RT6_LOOKUP_F_IFACE;
1044 if (net->ipv6.devconf_all->forwarding == 0)
1045 strict |= RT6_LOOKUP_F_REACHABLE;
1047 read_lock_bh(&table->tb6_lock);
1049 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1052 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1056 rt = rt6_select(fn, oif, strict);
1057 if (rt->rt6i_nsiblings)
1058 rt = rt6_multipath_select(rt, fl6, oif, strict);
1059 if (rt == net->ipv6.ip6_null_entry) {
1060 fn = fib6_backtrack(fn, &fl6->saddr);
1062 goto redo_rt6_select;
1063 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1064 /* also consider unreachable route */
1065 strict &= ~RT6_LOOKUP_F_REACHABLE;
1067 goto redo_rt6_select;
1072 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1073 dst_use(&rt->dst, jiffies);
1074 read_unlock_bh(&table->tb6_lock);
1076 rt6_dst_from_metrics_check(rt);
1078 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1079 !(rt->rt6i_flags & RTF_GATEWAY))) {
1080 /* Create a RTF_CACHE clone which will not be
1081 * owned by the fib6 tree. It is for the special case where
1082 * the daddr in the skb during the neighbor look-up is different
1083 * from the fl6->daddr used to look-up route here.
1086 struct rt6_info *uncached_rt;
1088 dst_use(&rt->dst, jiffies);
1089 read_unlock_bh(&table->tb6_lock);
1091 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1092 dst_release(&rt->dst);
1095 rt6_uncached_list_add(uncached_rt);
1097 uncached_rt = net->ipv6.ip6_null_entry;
1099 dst_hold(&uncached_rt->dst);
1103 /* Get a percpu copy */
1105 struct rt6_info *pcpu_rt;
1107 rt->dst.lastuse = jiffies;
1109 pcpu_rt = rt6_get_pcpu_route(rt);
1112 read_unlock_bh(&table->tb6_lock);
1114 /* We have to do the read_unlock first
1115 * because rt6_make_pcpu_route() may trigger
1116 * ip6_dst_gc() which will take the write_lock.
1119 read_unlock_bh(&table->tb6_lock);
1120 pcpu_rt = rt6_make_pcpu_route(rt);
1121 dst_release(&rt->dst);
1129 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1130 struct flowi6 *fl6, int flags)
1132 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1135 static struct dst_entry *ip6_route_input_lookup(struct net *net,
1136 struct net_device *dev,
1137 struct flowi6 *fl6, int flags)
1139 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1140 flags |= RT6_LOOKUP_F_IFACE;
1142 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1145 void ip6_route_input(struct sk_buff *skb)
1147 const struct ipv6hdr *iph = ipv6_hdr(skb);
1148 struct net *net = dev_net(skb->dev);
1149 int flags = RT6_LOOKUP_F_HAS_SADDR;
1150 struct ip_tunnel_info *tun_info;
1151 struct flowi6 fl6 = {
1152 .flowi6_iif = l3mdev_fib_oif(skb->dev),
1153 .daddr = iph->daddr,
1154 .saddr = iph->saddr,
1155 .flowlabel = ip6_flowinfo(iph),
1156 .flowi6_mark = skb->mark,
1157 .flowi6_proto = iph->nexthdr,
1160 tun_info = skb_tunnel_info(skb);
1161 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1162 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1164 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1167 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1168 struct flowi6 *fl6, int flags)
1170 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1173 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1174 struct flowi6 *fl6, int flags)
1176 struct dst_entry *dst;
1179 dst = l3mdev_rt6_dst_by_oif(net, fl6);
1183 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1185 any_src = ipv6_addr_any(&fl6->saddr);
1186 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1187 (fl6->flowi6_oif && any_src))
1188 flags |= RT6_LOOKUP_F_IFACE;
1191 flags |= RT6_LOOKUP_F_HAS_SADDR;
1193 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1195 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1197 EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1199 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1201 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1202 struct dst_entry *new = NULL;
1204 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1210 new->input = dst_discard;
1211 new->output = dst_discard_out;
1213 dst_copy_metrics(new, &ort->dst);
1214 rt->rt6i_idev = ort->rt6i_idev;
1216 in6_dev_hold(rt->rt6i_idev);
1218 rt->rt6i_gateway = ort->rt6i_gateway;
1219 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
1220 rt->rt6i_metric = 0;
1222 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1223 #ifdef CONFIG_IPV6_SUBTREES
1224 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1230 dst_release(dst_orig);
1231 return new ? new : ERR_PTR(-ENOMEM);
1235 * Destination cache support functions
1238 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1241 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1242 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1245 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1247 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1250 if (rt6_check_expired(rt))
1256 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1258 if (!__rt6_check_expired(rt) &&
1259 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1260 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1266 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1268 struct rt6_info *rt;
1270 rt = (struct rt6_info *) dst;
1272 /* All IPV6 dsts are created with ->obsolete set to the value
1273 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1274 * into this function always.
1277 rt6_dst_from_metrics_check(rt);
1279 if (rt->rt6i_flags & RTF_PCPU ||
1280 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
1281 return rt6_dst_from_check(rt, cookie);
1283 return rt6_check(rt, cookie);
1286 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1288 struct rt6_info *rt = (struct rt6_info *) dst;
1291 if (rt->rt6i_flags & RTF_CACHE) {
1292 if (rt6_check_expired(rt)) {
1304 static void ip6_link_failure(struct sk_buff *skb)
1306 struct rt6_info *rt;
1308 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1310 rt = (struct rt6_info *) skb_dst(skb);
1312 if (rt->rt6i_flags & RTF_CACHE) {
1315 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1316 rt->rt6i_node->fn_sernum = -1;
1321 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1323 struct net *net = dev_net(rt->dst.dev);
1325 rt->rt6i_flags |= RTF_MODIFIED;
1326 rt->rt6i_pmtu = mtu;
1327 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1330 static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1332 return !(rt->rt6i_flags & RTF_CACHE) &&
1333 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1336 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1337 const struct ipv6hdr *iph, u32 mtu)
1339 struct rt6_info *rt6 = (struct rt6_info *)dst;
1341 if (rt6->rt6i_flags & RTF_LOCAL)
1345 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1346 if (mtu >= dst_mtu(dst))
1349 if (!rt6_cache_allowed_for_pmtu(rt6)) {
1350 rt6_do_update_pmtu(rt6, mtu);
1352 const struct in6_addr *daddr, *saddr;
1353 struct rt6_info *nrt6;
1356 daddr = &iph->daddr;
1357 saddr = &iph->saddr;
1359 daddr = &sk->sk_v6_daddr;
1360 saddr = &inet6_sk(sk)->saddr;
1364 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1366 rt6_do_update_pmtu(nrt6, mtu);
1368 /* ip6_ins_rt(nrt6) will bump the
1369 * rt6->rt6i_node->fn_sernum
1370 * which will fail the next rt6_check() and
1371 * invalidate the sk->sk_dst_cache.
1378 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1379 struct sk_buff *skb, u32 mtu)
1381 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1384 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1385 int oif, u32 mark, kuid_t uid)
1387 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1388 struct dst_entry *dst;
1391 memset(&fl6, 0, sizeof(fl6));
1392 fl6.flowi6_oif = oif;
1393 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1394 fl6.daddr = iph->daddr;
1395 fl6.saddr = iph->saddr;
1396 fl6.flowlabel = ip6_flowinfo(iph);
1397 fl6.flowi6_uid = uid;
1399 dst = ip6_route_output(net, NULL, &fl6);
1401 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1404 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1406 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1408 ip6_update_pmtu(skb, sock_net(sk), mtu,
1409 sk->sk_bound_dev_if, sk->sk_mark, sock_i_uid(sk));
1411 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1413 /* Handle redirects */
1414 struct ip6rd_flowi {
1416 struct in6_addr gateway;
1419 static struct rt6_info *__ip6_route_redirect(struct net *net,
1420 struct fib6_table *table,
1424 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1425 struct rt6_info *rt;
1426 struct fib6_node *fn;
1428 /* Get the "current" route for this destination and
1429 * check if the redirect has come from approriate router.
1431 * RFC 4861 specifies that redirects should only be
1432 * accepted if they come from the nexthop to the target.
1433 * Due to the way the routes are chosen, this notion
1434 * is a bit fuzzy and one might need to check all possible
1438 read_lock_bh(&table->tb6_lock);
1439 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1441 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1442 if (rt6_check_expired(rt))
1446 if (!(rt->rt6i_flags & RTF_GATEWAY))
1448 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1450 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1456 rt = net->ipv6.ip6_null_entry;
1457 else if (rt->dst.error) {
1458 rt = net->ipv6.ip6_null_entry;
1462 if (rt == net->ipv6.ip6_null_entry) {
1463 fn = fib6_backtrack(fn, &fl6->saddr);
1471 read_unlock_bh(&table->tb6_lock);
1476 static struct dst_entry *ip6_route_redirect(struct net *net,
1477 const struct flowi6 *fl6,
1478 const struct in6_addr *gateway)
1480 int flags = RT6_LOOKUP_F_HAS_SADDR;
1481 struct ip6rd_flowi rdfl;
1484 rdfl.gateway = *gateway;
1486 return fib6_rule_lookup(net, &rdfl.fl6,
1487 flags, __ip6_route_redirect);
1490 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1492 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1493 struct dst_entry *dst;
1496 memset(&fl6, 0, sizeof(fl6));
1497 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1498 fl6.flowi6_oif = oif;
1499 fl6.flowi6_mark = mark;
1500 fl6.daddr = iph->daddr;
1501 fl6.saddr = iph->saddr;
1502 fl6.flowlabel = ip6_flowinfo(iph);
1504 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1505 rt6_do_redirect(dst, NULL, skb);
1508 EXPORT_SYMBOL_GPL(ip6_redirect);
1510 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1513 const struct ipv6hdr *iph = ipv6_hdr(skb);
1514 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1515 struct dst_entry *dst;
1518 memset(&fl6, 0, sizeof(fl6));
1519 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1520 fl6.flowi6_oif = oif;
1521 fl6.flowi6_mark = mark;
1522 fl6.daddr = msg->dest;
1523 fl6.saddr = iph->daddr;
1525 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1526 rt6_do_redirect(dst, NULL, skb);
1530 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1532 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1534 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1536 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1538 struct net_device *dev = dst->dev;
1539 unsigned int mtu = dst_mtu(dst);
1540 struct net *net = dev_net(dev);
1542 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1544 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1545 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1548 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1549 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1550 * IPV6_MAXPLEN is also valid and means: "any MSS,
1551 * rely only on pmtu discovery"
1553 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1558 static unsigned int ip6_mtu(const struct dst_entry *dst)
1560 const struct rt6_info *rt = (const struct rt6_info *)dst;
1561 unsigned int mtu = rt->rt6i_pmtu;
1562 struct inet6_dev *idev;
1567 mtu = dst_metric_raw(dst, RTAX_MTU);
1574 idev = __in6_dev_get(dst->dev);
1576 mtu = idev->cnf.mtu6;
1580 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1583 static struct dst_entry *icmp6_dst_gc_list;
1584 static DEFINE_SPINLOCK(icmp6_dst_lock);
1586 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1589 struct dst_entry *dst;
1590 struct rt6_info *rt;
1591 struct inet6_dev *idev = in6_dev_get(dev);
1592 struct net *net = dev_net(dev);
1594 if (unlikely(!idev))
1595 return ERR_PTR(-ENODEV);
1597 rt = ip6_dst_alloc(net, dev, 0);
1598 if (unlikely(!rt)) {
1600 dst = ERR_PTR(-ENOMEM);
1604 rt->dst.flags |= DST_HOST;
1605 rt->dst.output = ip6_output;
1606 atomic_set(&rt->dst.__refcnt, 1);
1607 rt->rt6i_gateway = fl6->daddr;
1608 rt->rt6i_dst.addr = fl6->daddr;
1609 rt->rt6i_dst.plen = 128;
1610 rt->rt6i_idev = idev;
1611 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1613 spin_lock_bh(&icmp6_dst_lock);
1614 rt->dst.next = icmp6_dst_gc_list;
1615 icmp6_dst_gc_list = &rt->dst;
1616 spin_unlock_bh(&icmp6_dst_lock);
1618 fib6_force_start_gc(net);
1620 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1626 int icmp6_dst_gc(void)
1628 struct dst_entry *dst, **pprev;
1631 spin_lock_bh(&icmp6_dst_lock);
1632 pprev = &icmp6_dst_gc_list;
1634 while ((dst = *pprev) != NULL) {
1635 if (!atomic_read(&dst->__refcnt)) {
1644 spin_unlock_bh(&icmp6_dst_lock);
1649 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1652 struct dst_entry *dst, **pprev;
1654 spin_lock_bh(&icmp6_dst_lock);
1655 pprev = &icmp6_dst_gc_list;
1656 while ((dst = *pprev) != NULL) {
1657 struct rt6_info *rt = (struct rt6_info *) dst;
1658 if (func(rt, arg)) {
1665 spin_unlock_bh(&icmp6_dst_lock);
1668 static int ip6_dst_gc(struct dst_ops *ops)
1670 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1671 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1672 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1673 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1674 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1675 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1678 entries = dst_entries_get_fast(ops);
1679 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1680 entries <= rt_max_size)
1683 net->ipv6.ip6_rt_gc_expire++;
1684 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1685 entries = dst_entries_get_slow(ops);
1686 if (entries < ops->gc_thresh)
1687 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1689 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1690 return entries > rt_max_size;
1693 static int ip6_convert_metrics(struct mx6_config *mxc,
1694 const struct fib6_config *cfg)
1696 bool ecn_ca = false;
1704 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1708 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1709 int type = nla_type(nla);
1714 if (unlikely(type > RTAX_MAX))
1717 if (type == RTAX_CC_ALGO) {
1718 char tmp[TCP_CA_NAME_MAX];
1720 nla_strlcpy(tmp, nla, sizeof(tmp));
1721 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1722 if (val == TCP_CA_UNSPEC)
1725 val = nla_get_u32(nla);
1727 if (type == RTAX_HOPLIMIT && val > 255)
1729 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1733 __set_bit(type - 1, mxc->mx_valid);
1737 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1738 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1748 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1750 struct net *net = cfg->fc_nlinfo.nl_net;
1751 struct rt6_info *rt = NULL;
1752 struct net_device *dev = NULL;
1753 struct inet6_dev *idev = NULL;
1754 struct fib6_table *table;
1758 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1760 #ifndef CONFIG_IPV6_SUBTREES
1761 if (cfg->fc_src_len)
1764 if (cfg->fc_ifindex) {
1766 dev = dev_get_by_index(net, cfg->fc_ifindex);
1769 idev = in6_dev_get(dev);
1774 if (cfg->fc_metric == 0)
1775 cfg->fc_metric = IP6_RT_PRIO_USER;
1778 if (cfg->fc_nlinfo.nlh &&
1779 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1780 table = fib6_get_table(net, cfg->fc_table);
1782 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1783 table = fib6_new_table(net, cfg->fc_table);
1786 table = fib6_new_table(net, cfg->fc_table);
1792 rt = ip6_dst_alloc(net, NULL,
1793 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1800 if (cfg->fc_flags & RTF_EXPIRES)
1801 rt6_set_expires(rt, jiffies +
1802 clock_t_to_jiffies(cfg->fc_expires));
1804 rt6_clean_expires(rt);
1806 if (cfg->fc_protocol == RTPROT_UNSPEC)
1807 cfg->fc_protocol = RTPROT_BOOT;
1808 rt->rt6i_protocol = cfg->fc_protocol;
1810 addr_type = ipv6_addr_type(&cfg->fc_dst);
1812 if (addr_type & IPV6_ADDR_MULTICAST)
1813 rt->dst.input = ip6_mc_input;
1814 else if (cfg->fc_flags & RTF_LOCAL)
1815 rt->dst.input = ip6_input;
1817 rt->dst.input = ip6_forward;
1819 rt->dst.output = ip6_output;
1821 if (cfg->fc_encap) {
1822 struct lwtunnel_state *lwtstate;
1824 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1825 cfg->fc_encap, AF_INET6, cfg,
1829 rt->dst.lwtstate = lwtstate_get(lwtstate);
1830 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1831 rt->dst.lwtstate->orig_output = rt->dst.output;
1832 rt->dst.output = lwtunnel_output;
1834 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1835 rt->dst.lwtstate->orig_input = rt->dst.input;
1836 rt->dst.input = lwtunnel_input;
1840 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1841 rt->rt6i_dst.plen = cfg->fc_dst_len;
1842 if (rt->rt6i_dst.plen == 128)
1843 rt->dst.flags |= DST_HOST;
1845 #ifdef CONFIG_IPV6_SUBTREES
1846 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1847 rt->rt6i_src.plen = cfg->fc_src_len;
1850 rt->rt6i_metric = cfg->fc_metric;
1852 /* We cannot add true routes via loopback here,
1853 they would result in kernel looping; promote them to reject routes
1855 if ((cfg->fc_flags & RTF_REJECT) ||
1856 (dev && (dev->flags & IFF_LOOPBACK) &&
1857 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1858 !(cfg->fc_flags & RTF_LOCAL))) {
1859 /* hold loopback dev/idev if we haven't done so. */
1860 if (dev != net->loopback_dev) {
1865 dev = net->loopback_dev;
1867 idev = in6_dev_get(dev);
1873 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1874 switch (cfg->fc_type) {
1876 rt->dst.error = -EINVAL;
1877 rt->dst.output = dst_discard_out;
1878 rt->dst.input = dst_discard;
1881 rt->dst.error = -EACCES;
1882 rt->dst.output = ip6_pkt_prohibit_out;
1883 rt->dst.input = ip6_pkt_prohibit;
1886 case RTN_UNREACHABLE:
1888 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1889 : (cfg->fc_type == RTN_UNREACHABLE)
1890 ? -EHOSTUNREACH : -ENETUNREACH;
1891 rt->dst.output = ip6_pkt_discard_out;
1892 rt->dst.input = ip6_pkt_discard;
1898 if (cfg->fc_flags & RTF_GATEWAY) {
1899 const struct in6_addr *gw_addr;
1902 gw_addr = &cfg->fc_gateway;
1903 gwa_type = ipv6_addr_type(gw_addr);
1905 /* if gw_addr is local we will fail to detect this in case
1906 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1907 * will return already-added prefix route via interface that
1908 * prefix route was assigned to, which might be non-loopback.
1911 if (ipv6_chk_addr_and_flags(net, gw_addr,
1912 gwa_type & IPV6_ADDR_LINKLOCAL ?
1916 rt->rt6i_gateway = *gw_addr;
1918 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1919 struct rt6_info *grt;
1921 /* IPv6 strictly inhibits using not link-local
1922 addresses as nexthop address.
1923 Otherwise, router will not able to send redirects.
1924 It is very good, but in some (rare!) circumstances
1925 (SIT, PtP, NBMA NOARP links) it is handy to allow
1926 some exceptions. --ANK
1928 if (!(gwa_type & IPV6_ADDR_UNICAST))
1931 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1933 err = -EHOSTUNREACH;
1937 if (dev != grt->dst.dev) {
1943 idev = grt->rt6i_idev;
1945 in6_dev_hold(grt->rt6i_idev);
1947 if (!(grt->rt6i_flags & RTF_GATEWAY))
1955 if (!dev || (dev->flags & IFF_LOOPBACK))
1963 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1964 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1968 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1969 rt->rt6i_prefsrc.plen = 128;
1971 rt->rt6i_prefsrc.plen = 0;
1973 rt->rt6i_flags = cfg->fc_flags;
1977 rt->rt6i_idev = idev;
1978 rt->rt6i_table = table;
1980 cfg->fc_nlinfo.nl_net = dev_net(dev);
1991 return ERR_PTR(err);
1994 int ip6_route_add(struct fib6_config *cfg)
1996 struct mx6_config mxc = { .mx = NULL, };
1997 struct rt6_info *rt;
2000 rt = ip6_route_info_create(cfg);
2007 err = ip6_convert_metrics(&mxc, cfg);
2011 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2023 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2026 struct fib6_table *table;
2027 struct net *net = dev_net(rt->dst.dev);
2029 if (rt == net->ipv6.ip6_null_entry ||
2030 rt->dst.flags & DST_NOCACHE) {
2035 table = rt->rt6i_table;
2036 write_lock_bh(&table->tb6_lock);
2037 err = fib6_del(rt, info);
2038 write_unlock_bh(&table->tb6_lock);
2045 int ip6_del_rt(struct rt6_info *rt)
2047 struct nl_info info = {
2048 .nl_net = dev_net(rt->dst.dev),
2050 return __ip6_del_rt(rt, &info);
2053 static int ip6_route_del(struct fib6_config *cfg)
2055 struct fib6_table *table;
2056 struct fib6_node *fn;
2057 struct rt6_info *rt;
2060 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2064 read_lock_bh(&table->tb6_lock);
2066 fn = fib6_locate(&table->tb6_root,
2067 &cfg->fc_dst, cfg->fc_dst_len,
2068 &cfg->fc_src, cfg->fc_src_len);
2071 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2072 if ((rt->rt6i_flags & RTF_CACHE) &&
2073 !(cfg->fc_flags & RTF_CACHE))
2075 if (cfg->fc_ifindex &&
2077 rt->dst.dev->ifindex != cfg->fc_ifindex))
2079 if (cfg->fc_flags & RTF_GATEWAY &&
2080 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2082 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2085 read_unlock_bh(&table->tb6_lock);
2087 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2090 read_unlock_bh(&table->tb6_lock);
2095 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2097 struct netevent_redirect netevent;
2098 struct rt6_info *rt, *nrt = NULL;
2099 struct ndisc_options ndopts;
2100 struct inet6_dev *in6_dev;
2101 struct neighbour *neigh;
2103 int optlen, on_link;
2106 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2107 optlen -= sizeof(*msg);
2110 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2114 msg = (struct rd_msg *)icmp6_hdr(skb);
2116 if (ipv6_addr_is_multicast(&msg->dest)) {
2117 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2122 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2124 } else if (ipv6_addr_type(&msg->target) !=
2125 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2126 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2130 in6_dev = __in6_dev_get(skb->dev);
2133 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2137 * The IP source address of the Redirect MUST be the same as the current
2138 * first-hop router for the specified ICMP Destination Address.
2141 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
2142 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2147 if (ndopts.nd_opts_tgt_lladdr) {
2148 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2151 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2156 rt = (struct rt6_info *) dst;
2157 if (rt->rt6i_flags & RTF_REJECT) {
2158 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2162 /* Redirect received -> path was valid.
2163 * Look, redirects are sent only in response to data packets,
2164 * so that this nexthop apparently is reachable. --ANK
2166 dst_confirm(&rt->dst);
2168 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2173 * We have finally decided to accept it.
2176 neigh_update(neigh, lladdr, NUD_STALE,
2177 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2178 NEIGH_UPDATE_F_OVERRIDE|
2179 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2180 NEIGH_UPDATE_F_ISROUTER))
2183 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2187 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2189 nrt->rt6i_flags &= ~RTF_GATEWAY;
2191 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2193 if (ip6_ins_rt(nrt))
2196 netevent.old = &rt->dst;
2197 netevent.new = &nrt->dst;
2198 netevent.daddr = &msg->dest;
2199 netevent.neigh = neigh;
2200 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2202 if (rt->rt6i_flags & RTF_CACHE) {
2203 rt = (struct rt6_info *) dst_clone(&rt->dst);
2208 neigh_release(neigh);
2212 * Misc support functions
2215 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2217 BUG_ON(from->dst.from);
2219 rt->rt6i_flags &= ~RTF_EXPIRES;
2220 dst_hold(&from->dst);
2221 rt->dst.from = &from->dst;
2222 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2225 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2227 rt->dst.input = ort->dst.input;
2228 rt->dst.output = ort->dst.output;
2229 rt->rt6i_dst = ort->rt6i_dst;
2230 rt->dst.error = ort->dst.error;
2231 rt->rt6i_idev = ort->rt6i_idev;
2233 in6_dev_hold(rt->rt6i_idev);
2234 rt->dst.lastuse = jiffies;
2235 rt->rt6i_gateway = ort->rt6i_gateway;
2236 rt->rt6i_flags = ort->rt6i_flags;
2237 rt6_set_from(rt, ort);
2238 rt->rt6i_metric = ort->rt6i_metric;
2239 #ifdef CONFIG_IPV6_SUBTREES
2240 rt->rt6i_src = ort->rt6i_src;
2242 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2243 rt->rt6i_table = ort->rt6i_table;
2244 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2247 #ifdef CONFIG_IPV6_ROUTE_INFO
2248 static struct rt6_info *rt6_get_route_info(struct net_device *dev,
2249 const struct in6_addr *prefix, int prefixlen,
2250 const struct in6_addr *gwaddr)
2252 struct fib6_node *fn;
2253 struct rt6_info *rt = NULL;
2254 struct fib6_table *table;
2256 table = fib6_get_table(dev_net(dev),
2257 addrconf_rt_table(dev, RT6_TABLE_INFO));
2261 read_lock_bh(&table->tb6_lock);
2262 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2266 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2267 if (rt->dst.dev->ifindex != dev->ifindex)
2269 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2271 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2277 read_unlock_bh(&table->tb6_lock);
2281 static struct rt6_info *rt6_add_route_info(struct net_device *dev,
2282 const struct in6_addr *prefix, int prefixlen,
2283 const struct in6_addr *gwaddr, unsigned int pref)
2285 struct fib6_config cfg = {
2286 .fc_metric = IP6_RT_PRIO_USER,
2287 .fc_ifindex = dev->ifindex,
2288 .fc_dst_len = prefixlen,
2289 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2290 RTF_UP | RTF_PREF(pref),
2291 .fc_nlinfo.portid = 0,
2292 .fc_nlinfo.nlh = NULL,
2293 .fc_nlinfo.nl_net = dev_net(dev),
2296 cfg.fc_table = l3mdev_fib_table_by_index(dev_net(dev), dev->ifindex) ? : addrconf_rt_table(dev, RT6_TABLE_INFO);
2297 cfg.fc_dst = *prefix;
2298 cfg.fc_gateway = *gwaddr;
2300 /* We should treat it as a default route if prefix length is 0. */
2302 cfg.fc_flags |= RTF_DEFAULT;
2304 ip6_route_add(&cfg);
2306 return rt6_get_route_info(dev, prefix, prefixlen, gwaddr);
2310 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2312 struct rt6_info *rt;
2313 struct fib6_table *table;
2315 table = fib6_get_table(dev_net(dev),
2316 addrconf_rt_table(dev, RT6_TABLE_MAIN));
2320 read_lock_bh(&table->tb6_lock);
2321 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2322 if (dev == rt->dst.dev &&
2323 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2324 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2329 read_unlock_bh(&table->tb6_lock);
2333 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2334 struct net_device *dev,
2337 struct fib6_config cfg = {
2338 .fc_table = l3mdev_fib_table(dev) ? : addrconf_rt_table(dev, RT6_TABLE_DFLT),
2339 .fc_metric = IP6_RT_PRIO_USER,
2340 .fc_ifindex = dev->ifindex,
2341 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2342 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2343 .fc_nlinfo.portid = 0,
2344 .fc_nlinfo.nlh = NULL,
2345 .fc_nlinfo.nl_net = dev_net(dev),
2348 cfg.fc_gateway = *gwaddr;
2350 ip6_route_add(&cfg);
2352 return rt6_get_dflt_router(gwaddr, dev);
2356 int rt6_addrconf_purge(struct rt6_info *rt, void *arg) {
2357 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2358 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2))
2363 void rt6_purge_dflt_routers(struct net *net)
2365 fib6_clean_all(net, rt6_addrconf_purge, NULL);
2368 static void rtmsg_to_fib6_config(struct net *net,
2369 struct in6_rtmsg *rtmsg,
2370 struct fib6_config *cfg)
2372 memset(cfg, 0, sizeof(*cfg));
2374 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2376 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2377 cfg->fc_metric = rtmsg->rtmsg_metric;
2378 cfg->fc_expires = rtmsg->rtmsg_info;
2379 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2380 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2381 cfg->fc_flags = rtmsg->rtmsg_flags;
2383 cfg->fc_nlinfo.nl_net = net;
2385 cfg->fc_dst = rtmsg->rtmsg_dst;
2386 cfg->fc_src = rtmsg->rtmsg_src;
2387 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2390 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2392 struct fib6_config cfg;
2393 struct in6_rtmsg rtmsg;
2397 case SIOCADDRT: /* Add a route */
2398 case SIOCDELRT: /* Delete a route */
2399 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2401 err = copy_from_user(&rtmsg, arg,
2402 sizeof(struct in6_rtmsg));
2406 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2411 err = ip6_route_add(&cfg);
2414 err = ip6_route_del(&cfg);
2428 * Drop the packet on the floor
2431 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2434 struct dst_entry *dst = skb_dst(skb);
2435 switch (ipstats_mib_noroutes) {
2436 case IPSTATS_MIB_INNOROUTES:
2437 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2438 if (type == IPV6_ADDR_ANY) {
2439 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2440 IPSTATS_MIB_INADDRERRORS);
2444 case IPSTATS_MIB_OUTNOROUTES:
2445 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2446 ipstats_mib_noroutes);
2449 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2454 static int ip6_pkt_discard(struct sk_buff *skb)
2456 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2459 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2461 skb->dev = skb_dst(skb)->dev;
2462 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2465 static int ip6_pkt_prohibit(struct sk_buff *skb)
2467 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2470 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2472 skb->dev = skb_dst(skb)->dev;
2473 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2477 * Allocate a dst for local (unicast / anycast) address.
2480 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2481 const struct in6_addr *addr,
2485 struct net *net = dev_net(idev->dev);
2486 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2489 return ERR_PTR(-ENOMEM);
2493 rt->dst.flags |= DST_HOST;
2494 rt->dst.input = ip6_input;
2495 rt->dst.output = ip6_output;
2496 rt->rt6i_idev = idev;
2498 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2500 rt->rt6i_flags |= RTF_ANYCAST;
2502 rt->rt6i_flags |= RTF_LOCAL;
2504 rt->rt6i_gateway = *addr;
2505 rt->rt6i_dst.addr = *addr;
2506 rt->rt6i_dst.plen = 128;
2507 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2508 rt->rt6i_table = fib6_get_table(net, tb_id);
2509 rt->dst.flags |= DST_NOCACHE;
2511 atomic_set(&rt->dst.__refcnt, 1);
2516 int ip6_route_get_saddr(struct net *net,
2517 struct rt6_info *rt,
2518 const struct in6_addr *daddr,
2520 struct in6_addr *saddr)
2522 struct inet6_dev *idev =
2523 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
2525 if (rt && rt->rt6i_prefsrc.plen)
2526 *saddr = rt->rt6i_prefsrc.addr;
2528 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2529 daddr, prefs, saddr);
2533 /* remove deleted ip from prefsrc entries */
2534 struct arg_dev_net_ip {
2535 struct net_device *dev;
2537 struct in6_addr *addr;
2540 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2542 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2543 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2544 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2546 if (((void *)rt->dst.dev == dev || !dev) &&
2547 rt != net->ipv6.ip6_null_entry &&
2548 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2549 /* remove prefsrc entry */
2550 rt->rt6i_prefsrc.plen = 0;
2555 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2557 struct net *net = dev_net(ifp->idev->dev);
2558 struct arg_dev_net_ip adni = {
2559 .dev = ifp->idev->dev,
2563 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2566 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2567 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2569 /* Remove routers and update dst entries when gateway turn into host. */
2570 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2572 struct in6_addr *gateway = (struct in6_addr *)arg;
2574 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2575 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2576 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2582 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2584 fib6_clean_all(net, fib6_clean_tohost, gateway);
2587 struct arg_dev_net {
2588 struct net_device *dev;
2592 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2594 const struct arg_dev_net *adn = arg;
2595 const struct net_device *dev = adn->dev;
2597 if ((rt->dst.dev == dev || !dev) &&
2598 rt != adn->net->ipv6.ip6_null_entry)
2604 void rt6_ifdown(struct net *net, struct net_device *dev)
2606 struct arg_dev_net adn = {
2611 fib6_clean_all(net, fib6_ifdown, &adn);
2612 icmp6_clean_all(fib6_ifdown, &adn);
2614 rt6_uncached_list_flush_dev(net, dev);
2617 struct rt6_mtu_change_arg {
2618 struct net_device *dev;
2622 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2624 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2625 struct inet6_dev *idev;
2627 /* In IPv6 pmtu discovery is not optional,
2628 so that RTAX_MTU lock cannot disable it.
2629 We still use this lock to block changes
2630 caused by addrconf/ndisc.
2633 idev = __in6_dev_get(arg->dev);
2637 /* For administrative MTU increase, there is no way to discover
2638 IPv6 PMTU increase, so PMTU increase should be updated here.
2639 Since RFC 1981 doesn't include administrative MTU increase
2640 update PMTU increase is a MUST. (i.e. jumbo frame)
2643 If new MTU is less than route PMTU, this new MTU will be the
2644 lowest MTU in the path, update the route PMTU to reflect PMTU
2645 decreases; if new MTU is greater than route PMTU, and the
2646 old MTU is the lowest MTU in the path, update the route PMTU
2647 to reflect the increase. In this case if the other nodes' MTU
2648 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2651 if (rt->dst.dev == arg->dev &&
2652 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2653 if (rt->rt6i_flags & RTF_CACHE) {
2654 /* For RTF_CACHE with rt6i_pmtu == 0
2655 * (i.e. a redirected route),
2656 * the metrics of its rt->dst.from has already
2659 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2660 rt->rt6i_pmtu = arg->mtu;
2661 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2662 (dst_mtu(&rt->dst) < arg->mtu &&
2663 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2664 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2670 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2672 struct rt6_mtu_change_arg arg = {
2677 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2680 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2681 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2682 [RTA_OIF] = { .type = NLA_U32 },
2683 [RTA_IIF] = { .type = NLA_U32 },
2684 [RTA_PRIORITY] = { .type = NLA_U32 },
2685 [RTA_METRICS] = { .type = NLA_NESTED },
2686 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2687 [RTA_PREF] = { .type = NLA_U8 },
2688 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2689 [RTA_ENCAP] = { .type = NLA_NESTED },
2690 [RTA_UID] = { .type = NLA_U32 },
2693 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2694 struct fib6_config *cfg)
2697 struct nlattr *tb[RTA_MAX+1];
2701 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2706 rtm = nlmsg_data(nlh);
2707 memset(cfg, 0, sizeof(*cfg));
2709 cfg->fc_table = rtm->rtm_table;
2710 cfg->fc_dst_len = rtm->rtm_dst_len;
2711 cfg->fc_src_len = rtm->rtm_src_len;
2712 cfg->fc_flags = RTF_UP;
2713 cfg->fc_protocol = rtm->rtm_protocol;
2714 cfg->fc_type = rtm->rtm_type;
2716 if (rtm->rtm_type == RTN_UNREACHABLE ||
2717 rtm->rtm_type == RTN_BLACKHOLE ||
2718 rtm->rtm_type == RTN_PROHIBIT ||
2719 rtm->rtm_type == RTN_THROW)
2720 cfg->fc_flags |= RTF_REJECT;
2722 if (rtm->rtm_type == RTN_LOCAL)
2723 cfg->fc_flags |= RTF_LOCAL;
2725 if (rtm->rtm_flags & RTM_F_CLONED)
2726 cfg->fc_flags |= RTF_CACHE;
2728 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2729 cfg->fc_nlinfo.nlh = nlh;
2730 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2732 if (tb[RTA_GATEWAY]) {
2733 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2734 cfg->fc_flags |= RTF_GATEWAY;
2738 int plen = (rtm->rtm_dst_len + 7) >> 3;
2740 if (nla_len(tb[RTA_DST]) < plen)
2743 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2747 int plen = (rtm->rtm_src_len + 7) >> 3;
2749 if (nla_len(tb[RTA_SRC]) < plen)
2752 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2755 if (tb[RTA_PREFSRC])
2756 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2759 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2761 if (tb[RTA_PRIORITY])
2762 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2764 if (tb[RTA_METRICS]) {
2765 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2766 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2770 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2772 if (tb[RTA_MULTIPATH]) {
2773 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2774 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2778 pref = nla_get_u8(tb[RTA_PREF]);
2779 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2780 pref != ICMPV6_ROUTER_PREF_HIGH)
2781 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2782 cfg->fc_flags |= RTF_PREF(pref);
2786 cfg->fc_encap = tb[RTA_ENCAP];
2788 if (tb[RTA_ENCAP_TYPE])
2789 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2797 struct rt6_info *rt6_info;
2798 struct fib6_config r_cfg;
2799 struct mx6_config mxc;
2800 struct list_head next;
2803 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2807 list_for_each_entry(nh, rt6_nh_list, next) {
2808 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2809 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2810 nh->r_cfg.fc_ifindex);
2814 static int ip6_route_info_append(struct list_head *rt6_nh_list,
2815 struct rt6_info *rt, struct fib6_config *r_cfg)
2818 struct rt6_info *rtnh;
2821 list_for_each_entry(nh, rt6_nh_list, next) {
2822 /* check if rt6_info already exists */
2823 rtnh = nh->rt6_info;
2825 if (rtnh->dst.dev == rt->dst.dev &&
2826 rtnh->rt6i_idev == rt->rt6i_idev &&
2827 ipv6_addr_equal(&rtnh->rt6i_gateway,
2832 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2836 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2841 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2842 list_add_tail(&nh->next, rt6_nh_list);
2847 static int ip6_route_multipath_add(struct fib6_config *cfg)
2849 struct fib6_config r_cfg;
2850 struct rtnexthop *rtnh;
2851 struct rt6_info *rt;
2852 struct rt6_nh *err_nh;
2853 struct rt6_nh *nh, *nh_safe;
2858 int replace = (cfg->fc_nlinfo.nlh &&
2859 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2860 LIST_HEAD(rt6_nh_list);
2862 remaining = cfg->fc_mp_len;
2863 rtnh = (struct rtnexthop *)cfg->fc_mp;
2865 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2866 * rt6_info structs per nexthop
2868 while (rtnh_ok(rtnh, remaining)) {
2869 memcpy(&r_cfg, cfg, sizeof(*cfg));
2870 if (rtnh->rtnh_ifindex)
2871 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2873 attrlen = rtnh_attrlen(rtnh);
2875 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2877 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2879 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2880 r_cfg.fc_flags |= RTF_GATEWAY;
2882 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2883 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2885 r_cfg.fc_encap_type = nla_get_u16(nla);
2888 rt = ip6_route_info_create(&r_cfg);
2895 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
2901 rtnh = rtnh_next(rtnh, &remaining);
2905 list_for_each_entry(nh, &rt6_nh_list, next) {
2906 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2907 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2908 nh->rt6_info = NULL;
2911 ip6_print_replace_route_err(&rt6_nh_list);
2916 /* Because each route is added like a single route we remove
2917 * these flags after the first nexthop: if there is a collision,
2918 * we have already failed to add the first nexthop:
2919 * fib6_add_rt2node() has rejected it; when replacing, old
2920 * nexthops have been replaced by first new, the rest should
2923 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2931 /* Delete routes that were already added */
2932 list_for_each_entry(nh, &rt6_nh_list, next) {
2935 ip6_route_del(&nh->r_cfg);
2939 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
2941 dst_free(&nh->rt6_info->dst);
2943 list_del(&nh->next);
2950 static int ip6_route_multipath_del(struct fib6_config *cfg)
2952 struct fib6_config r_cfg;
2953 struct rtnexthop *rtnh;
2956 int err = 1, last_err = 0;
2958 remaining = cfg->fc_mp_len;
2959 rtnh = (struct rtnexthop *)cfg->fc_mp;
2961 /* Parse a Multipath Entry */
2962 while (rtnh_ok(rtnh, remaining)) {
2963 memcpy(&r_cfg, cfg, sizeof(*cfg));
2964 if (rtnh->rtnh_ifindex)
2965 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2967 attrlen = rtnh_attrlen(rtnh);
2969 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2971 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2973 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2974 r_cfg.fc_flags |= RTF_GATEWAY;
2977 err = ip6_route_del(&r_cfg);
2981 rtnh = rtnh_next(rtnh, &remaining);
2987 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2989 struct fib6_config cfg;
2992 err = rtm_to_fib6_config(skb, nlh, &cfg);
2997 return ip6_route_multipath_del(&cfg);
2999 return ip6_route_del(&cfg);
3002 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3004 struct fib6_config cfg;
3007 err = rtm_to_fib6_config(skb, nlh, &cfg);
3012 return ip6_route_multipath_add(&cfg);
3014 return ip6_route_add(&cfg);
3017 static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
3019 return NLMSG_ALIGN(sizeof(struct rtmsg))
3020 + nla_total_size(16) /* RTA_SRC */
3021 + nla_total_size(16) /* RTA_DST */
3022 + nla_total_size(16) /* RTA_GATEWAY */
3023 + nla_total_size(16) /* RTA_PREFSRC */
3024 + nla_total_size(4) /* RTA_TABLE */
3025 + nla_total_size(4) /* RTA_IIF */
3026 + nla_total_size(4) /* RTA_OIF */
3027 + nla_total_size(4) /* RTA_PRIORITY */
3028 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3029 + nla_total_size(sizeof(struct rta_cacheinfo))
3030 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3031 + nla_total_size(1) /* RTA_PREF */
3032 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3035 static int rt6_fill_node(struct net *net,
3036 struct sk_buff *skb, struct rt6_info *rt,
3037 struct in6_addr *dst, struct in6_addr *src,
3038 int iif, int type, u32 portid, u32 seq,
3039 int prefix, int nowait, unsigned int flags)
3041 u32 metrics[RTAX_MAX];
3043 struct nlmsghdr *nlh;
3047 if (prefix) { /* user wants prefix routes only */
3048 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3049 /* success since this is not a prefix route */
3054 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3058 rtm = nlmsg_data(nlh);
3059 rtm->rtm_family = AF_INET6;
3060 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3061 rtm->rtm_src_len = rt->rt6i_src.plen;
3064 table = rt->rt6i_table->tb6_id;
3066 table = RT6_TABLE_UNSPEC;
3067 rtm->rtm_table = table;
3068 if (nla_put_u32(skb, RTA_TABLE, table))
3069 goto nla_put_failure;
3070 if (rt->rt6i_flags & RTF_REJECT) {
3071 switch (rt->dst.error) {
3073 rtm->rtm_type = RTN_BLACKHOLE;
3076 rtm->rtm_type = RTN_PROHIBIT;
3079 rtm->rtm_type = RTN_THROW;
3082 rtm->rtm_type = RTN_UNREACHABLE;
3086 else if (rt->rt6i_flags & RTF_LOCAL)
3087 rtm->rtm_type = RTN_LOCAL;
3088 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3089 rtm->rtm_type = RTN_LOCAL;
3091 rtm->rtm_type = RTN_UNICAST;
3093 if (!netif_carrier_ok(rt->dst.dev)) {
3094 rtm->rtm_flags |= RTNH_F_LINKDOWN;
3095 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3096 rtm->rtm_flags |= RTNH_F_DEAD;
3098 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3099 rtm->rtm_protocol = rt->rt6i_protocol;
3100 if (rt->rt6i_flags & RTF_DYNAMIC)
3101 rtm->rtm_protocol = RTPROT_REDIRECT;
3102 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3103 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3104 rtm->rtm_protocol = RTPROT_RA;
3106 rtm->rtm_protocol = RTPROT_KERNEL;
3109 if (rt->rt6i_flags & RTF_CACHE)
3110 rtm->rtm_flags |= RTM_F_CLONED;
3113 if (nla_put_in6_addr(skb, RTA_DST, dst))
3114 goto nla_put_failure;
3115 rtm->rtm_dst_len = 128;
3116 } else if (rtm->rtm_dst_len)
3117 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3118 goto nla_put_failure;
3119 #ifdef CONFIG_IPV6_SUBTREES
3121 if (nla_put_in6_addr(skb, RTA_SRC, src))
3122 goto nla_put_failure;
3123 rtm->rtm_src_len = 128;
3124 } else if (rtm->rtm_src_len &&
3125 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3126 goto nla_put_failure;
3129 #ifdef CONFIG_IPV6_MROUTE
3130 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3131 int err = ip6mr_get_route(net, skb, rtm, nowait,
3138 goto nla_put_failure;
3140 if (err == -EMSGSIZE)
3141 goto nla_put_failure;
3146 if (nla_put_u32(skb, RTA_IIF, iif))
3147 goto nla_put_failure;
3149 struct in6_addr saddr_buf;
3150 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3151 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3152 goto nla_put_failure;
3155 if (rt->rt6i_prefsrc.plen) {
3156 struct in6_addr saddr_buf;
3157 saddr_buf = rt->rt6i_prefsrc.addr;
3158 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3159 goto nla_put_failure;
3162 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3164 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3165 if (rtnetlink_put_metrics(skb, metrics) < 0)
3166 goto nla_put_failure;
3168 if (rt->rt6i_flags & RTF_GATEWAY) {
3169 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3170 goto nla_put_failure;
3174 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3175 goto nla_put_failure;
3176 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3177 goto nla_put_failure;
3179 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3181 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3182 goto nla_put_failure;
3184 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3185 goto nla_put_failure;
3187 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
3189 nlmsg_end(skb, nlh);
3193 nlmsg_cancel(skb, nlh);
3197 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3199 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3202 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3203 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3204 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3208 return rt6_fill_node(arg->net,
3209 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3210 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3211 prefix, 0, NLM_F_MULTI);
3214 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3216 struct net *net = sock_net(in_skb->sk);
3217 struct nlattr *tb[RTA_MAX+1];
3218 struct rt6_info *rt;
3219 struct sk_buff *skb;
3222 int err, iif = 0, oif = 0;
3224 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3229 memset(&fl6, 0, sizeof(fl6));
3232 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3235 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3239 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3242 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3246 iif = nla_get_u32(tb[RTA_IIF]);
3249 oif = nla_get_u32(tb[RTA_OIF]);
3252 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3255 fl6.flowi6_uid = make_kuid(current_user_ns(),
3256 nla_get_u32(tb[RTA_UID]));
3258 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
3260 struct net_device *dev;
3263 dev = __dev_get_by_index(net, iif);
3269 fl6.flowi6_iif = iif;
3271 if (!ipv6_addr_any(&fl6.saddr))
3272 flags |= RT6_LOOKUP_F_HAS_SADDR;
3274 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3277 fl6.flowi6_oif = oif;
3279 if (netif_index_is_l3_master(net, oif)) {
3280 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3281 FLOWI_FLAG_SKIP_NH_OIF;
3284 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3287 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3294 /* Reserve room for dummy headers, this skb can pass
3295 through good chunk of routing engine.
3297 skb_reset_mac_header(skb);
3298 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3300 skb_dst_set(skb, &rt->dst);
3302 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3303 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3304 nlh->nlmsg_seq, 0, 0, 0);
3310 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3315 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3316 unsigned int nlm_flags)
3318 struct sk_buff *skb;
3319 struct net *net = info->nl_net;
3324 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3326 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3330 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3331 event, info->portid, seq, 0, 0, nlm_flags);
3333 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3334 WARN_ON(err == -EMSGSIZE);
3338 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3339 info->nlh, gfp_any());
3343 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3346 static int ip6_route_dev_notify(struct notifier_block *this,
3347 unsigned long event, void *ptr)
3349 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3350 struct net *net = dev_net(dev);
3352 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3353 net->ipv6.ip6_null_entry->dst.dev = dev;
3354 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3355 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3356 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3357 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3358 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3359 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3370 #ifdef CONFIG_PROC_FS
3372 static const struct file_operations ipv6_route_proc_fops = {
3373 .owner = THIS_MODULE,
3374 .open = ipv6_route_open,
3376 .llseek = seq_lseek,
3377 .release = seq_release_net,
3380 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3382 struct net *net = (struct net *)seq->private;
3383 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3384 net->ipv6.rt6_stats->fib_nodes,
3385 net->ipv6.rt6_stats->fib_route_nodes,
3386 net->ipv6.rt6_stats->fib_rt_alloc,
3387 net->ipv6.rt6_stats->fib_rt_entries,
3388 net->ipv6.rt6_stats->fib_rt_cache,
3389 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3390 net->ipv6.rt6_stats->fib_discarded_routes);
3395 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3397 return single_open_net(inode, file, rt6_stats_seq_show);
3400 static const struct file_operations rt6_stats_seq_fops = {
3401 .owner = THIS_MODULE,
3402 .open = rt6_stats_seq_open,
3404 .llseek = seq_lseek,
3405 .release = single_release_net,
3407 #endif /* CONFIG_PROC_FS */
3409 #ifdef CONFIG_SYSCTL
3412 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3413 void __user *buffer, size_t *lenp, loff_t *ppos)
3420 net = (struct net *)ctl->extra1;
3421 delay = net->ipv6.sysctl.flush_delay;
3422 proc_dointvec(ctl, write, buffer, lenp, ppos);
3423 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3427 struct ctl_table ipv6_route_table_template[] = {
3429 .procname = "flush",
3430 .data = &init_net.ipv6.sysctl.flush_delay,
3431 .maxlen = sizeof(int),
3433 .proc_handler = ipv6_sysctl_rtcache_flush
3436 .procname = "gc_thresh",
3437 .data = &ip6_dst_ops_template.gc_thresh,
3438 .maxlen = sizeof(int),
3440 .proc_handler = proc_dointvec,
3443 .procname = "max_size",
3444 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3445 .maxlen = sizeof(int),
3447 .proc_handler = proc_dointvec,
3450 .procname = "gc_min_interval",
3451 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3452 .maxlen = sizeof(int),
3454 .proc_handler = proc_dointvec_jiffies,
3457 .procname = "gc_timeout",
3458 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3459 .maxlen = sizeof(int),
3461 .proc_handler = proc_dointvec_jiffies,
3464 .procname = "gc_interval",
3465 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3466 .maxlen = sizeof(int),
3468 .proc_handler = proc_dointvec_jiffies,
3471 .procname = "gc_elasticity",
3472 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3473 .maxlen = sizeof(int),
3475 .proc_handler = proc_dointvec,
3478 .procname = "mtu_expires",
3479 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3480 .maxlen = sizeof(int),
3482 .proc_handler = proc_dointvec_jiffies,
3485 .procname = "min_adv_mss",
3486 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3487 .maxlen = sizeof(int),
3489 .proc_handler = proc_dointvec,
3492 .procname = "gc_min_interval_ms",
3493 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3494 .maxlen = sizeof(int),
3496 .proc_handler = proc_dointvec_ms_jiffies,
3501 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3503 struct ctl_table *table;
3505 table = kmemdup(ipv6_route_table_template,
3506 sizeof(ipv6_route_table_template),
3510 table[0].data = &net->ipv6.sysctl.flush_delay;
3511 table[0].extra1 = net;
3512 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3513 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3514 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3515 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3516 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3517 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3518 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3519 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3520 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3522 /* Don't export sysctls to unprivileged users */
3523 if (net->user_ns != &init_user_ns)
3524 table[0].procname = NULL;
3531 static int __net_init ip6_route_net_init(struct net *net)
3535 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3536 sizeof(net->ipv6.ip6_dst_ops));
3538 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3539 goto out_ip6_dst_ops;
3541 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3542 sizeof(*net->ipv6.ip6_null_entry),
3544 if (!net->ipv6.ip6_null_entry)
3545 goto out_ip6_dst_entries;
3546 net->ipv6.ip6_null_entry->dst.path =
3547 (struct dst_entry *)net->ipv6.ip6_null_entry;
3548 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3549 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3550 ip6_template_metrics, true);
3552 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3553 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3554 sizeof(*net->ipv6.ip6_prohibit_entry),
3556 if (!net->ipv6.ip6_prohibit_entry)
3557 goto out_ip6_null_entry;
3558 net->ipv6.ip6_prohibit_entry->dst.path =
3559 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3560 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3561 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3562 ip6_template_metrics, true);
3564 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3565 sizeof(*net->ipv6.ip6_blk_hole_entry),
3567 if (!net->ipv6.ip6_blk_hole_entry)
3568 goto out_ip6_prohibit_entry;
3569 net->ipv6.ip6_blk_hole_entry->dst.path =
3570 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3571 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3572 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3573 ip6_template_metrics, true);
3576 net->ipv6.sysctl.flush_delay = 0;
3577 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3578 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3579 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3580 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3581 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3582 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3583 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3585 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3591 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3592 out_ip6_prohibit_entry:
3593 kfree(net->ipv6.ip6_prohibit_entry);
3595 kfree(net->ipv6.ip6_null_entry);
3597 out_ip6_dst_entries:
3598 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3603 static void __net_exit ip6_route_net_exit(struct net *net)
3605 kfree(net->ipv6.ip6_null_entry);
3606 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3607 kfree(net->ipv6.ip6_prohibit_entry);
3608 kfree(net->ipv6.ip6_blk_hole_entry);
3610 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3613 static int __net_init ip6_route_net_init_late(struct net *net)
3615 #ifdef CONFIG_PROC_FS
3616 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3617 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3622 static void __net_exit ip6_route_net_exit_late(struct net *net)
3624 #ifdef CONFIG_PROC_FS
3625 remove_proc_entry("ipv6_route", net->proc_net);
3626 remove_proc_entry("rt6_stats", net->proc_net);
3630 static struct pernet_operations ip6_route_net_ops = {
3631 .init = ip6_route_net_init,
3632 .exit = ip6_route_net_exit,
3635 static int __net_init ipv6_inetpeer_init(struct net *net)
3637 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3641 inet_peer_base_init(bp);
3642 net->ipv6.peers = bp;
3646 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3648 struct inet_peer_base *bp = net->ipv6.peers;
3650 net->ipv6.peers = NULL;
3651 inetpeer_invalidate_tree(bp);
3655 static struct pernet_operations ipv6_inetpeer_ops = {
3656 .init = ipv6_inetpeer_init,
3657 .exit = ipv6_inetpeer_exit,
3660 static struct pernet_operations ip6_route_net_late_ops = {
3661 .init = ip6_route_net_init_late,
3662 .exit = ip6_route_net_exit_late,
3665 static struct notifier_block ip6_route_dev_notifier = {
3666 .notifier_call = ip6_route_dev_notify,
3670 int __init ip6_route_init(void)
3676 ip6_dst_ops_template.kmem_cachep =
3677 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3678 SLAB_HWCACHE_ALIGN, NULL);
3679 if (!ip6_dst_ops_template.kmem_cachep)
3682 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3684 goto out_kmem_cache;
3686 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3688 goto out_dst_entries;
3690 ret = register_pernet_subsys(&ip6_route_net_ops);
3692 goto out_register_inetpeer;
3694 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3696 /* Registering of the loopback is done before this portion of code,
3697 * the loopback reference in rt6_info will not be taken, do it
3698 * manually for init_net */
3699 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3700 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3701 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3702 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3703 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3704 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3705 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3709 goto out_register_subsys;
3715 ret = fib6_rules_init();
3719 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3721 goto fib6_rules_init;
3724 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3725 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3726 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3727 goto out_register_late_subsys;
3729 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3731 goto out_register_late_subsys;
3733 for_each_possible_cpu(cpu) {
3734 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3736 INIT_LIST_HEAD(&ul->head);
3737 spin_lock_init(&ul->lock);
3743 out_register_late_subsys:
3744 unregister_pernet_subsys(&ip6_route_net_late_ops);
3746 fib6_rules_cleanup();
3751 out_register_subsys:
3752 unregister_pernet_subsys(&ip6_route_net_ops);
3753 out_register_inetpeer:
3754 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3756 dst_entries_destroy(&ip6_dst_blackhole_ops);
3758 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3762 void ip6_route_cleanup(void)
3764 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3765 unregister_pernet_subsys(&ip6_route_net_late_ops);
3766 fib6_rules_cleanup();
3769 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3770 unregister_pernet_subsys(&ip6_route_net_ops);
3771 dst_entries_destroy(&ip6_dst_blackhole_ops);
3772 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);