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, sk->sk_uid);
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,
1493 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1494 struct dst_entry *dst;
1497 memset(&fl6, 0, sizeof(fl6));
1498 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1499 fl6.flowi6_oif = oif;
1500 fl6.flowi6_mark = mark;
1501 fl6.daddr = iph->daddr;
1502 fl6.saddr = iph->saddr;
1503 fl6.flowlabel = ip6_flowinfo(iph);
1504 fl6.flowi6_uid = uid;
1506 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1507 rt6_do_redirect(dst, NULL, skb);
1510 EXPORT_SYMBOL_GPL(ip6_redirect);
1512 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1515 const struct ipv6hdr *iph = ipv6_hdr(skb);
1516 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1517 struct dst_entry *dst;
1520 memset(&fl6, 0, sizeof(fl6));
1521 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1522 fl6.flowi6_oif = oif;
1523 fl6.flowi6_mark = mark;
1524 fl6.daddr = msg->dest;
1525 fl6.saddr = iph->daddr;
1526 fl6.flowi6_uid = sock_net_uid(net, NULL);
1528 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1529 rt6_do_redirect(dst, NULL, skb);
1533 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1535 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
1538 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1540 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1542 struct net_device *dev = dst->dev;
1543 unsigned int mtu = dst_mtu(dst);
1544 struct net *net = dev_net(dev);
1546 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1548 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1549 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1552 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1553 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1554 * IPV6_MAXPLEN is also valid and means: "any MSS,
1555 * rely only on pmtu discovery"
1557 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1562 static unsigned int ip6_mtu(const struct dst_entry *dst)
1564 const struct rt6_info *rt = (const struct rt6_info *)dst;
1565 unsigned int mtu = rt->rt6i_pmtu;
1566 struct inet6_dev *idev;
1571 mtu = dst_metric_raw(dst, RTAX_MTU);
1578 idev = __in6_dev_get(dst->dev);
1580 mtu = idev->cnf.mtu6;
1584 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1587 static struct dst_entry *icmp6_dst_gc_list;
1588 static DEFINE_SPINLOCK(icmp6_dst_lock);
1590 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1593 struct dst_entry *dst;
1594 struct rt6_info *rt;
1595 struct inet6_dev *idev = in6_dev_get(dev);
1596 struct net *net = dev_net(dev);
1598 if (unlikely(!idev))
1599 return ERR_PTR(-ENODEV);
1601 rt = ip6_dst_alloc(net, dev, 0);
1602 if (unlikely(!rt)) {
1604 dst = ERR_PTR(-ENOMEM);
1608 rt->dst.flags |= DST_HOST;
1609 rt->dst.output = ip6_output;
1610 atomic_set(&rt->dst.__refcnt, 1);
1611 rt->rt6i_gateway = fl6->daddr;
1612 rt->rt6i_dst.addr = fl6->daddr;
1613 rt->rt6i_dst.plen = 128;
1614 rt->rt6i_idev = idev;
1615 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1617 spin_lock_bh(&icmp6_dst_lock);
1618 rt->dst.next = icmp6_dst_gc_list;
1619 icmp6_dst_gc_list = &rt->dst;
1620 spin_unlock_bh(&icmp6_dst_lock);
1622 fib6_force_start_gc(net);
1624 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1630 int icmp6_dst_gc(void)
1632 struct dst_entry *dst, **pprev;
1635 spin_lock_bh(&icmp6_dst_lock);
1636 pprev = &icmp6_dst_gc_list;
1638 while ((dst = *pprev) != NULL) {
1639 if (!atomic_read(&dst->__refcnt)) {
1648 spin_unlock_bh(&icmp6_dst_lock);
1653 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1656 struct dst_entry *dst, **pprev;
1658 spin_lock_bh(&icmp6_dst_lock);
1659 pprev = &icmp6_dst_gc_list;
1660 while ((dst = *pprev) != NULL) {
1661 struct rt6_info *rt = (struct rt6_info *) dst;
1662 if (func(rt, arg)) {
1669 spin_unlock_bh(&icmp6_dst_lock);
1672 static int ip6_dst_gc(struct dst_ops *ops)
1674 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1675 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1676 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1677 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1678 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1679 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1682 entries = dst_entries_get_fast(ops);
1683 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1684 entries <= rt_max_size)
1687 net->ipv6.ip6_rt_gc_expire++;
1688 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1689 entries = dst_entries_get_slow(ops);
1690 if (entries < ops->gc_thresh)
1691 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1693 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1694 return entries > rt_max_size;
1697 static int ip6_convert_metrics(struct mx6_config *mxc,
1698 const struct fib6_config *cfg)
1700 bool ecn_ca = false;
1708 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1712 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1713 int type = nla_type(nla);
1718 if (unlikely(type > RTAX_MAX))
1721 if (type == RTAX_CC_ALGO) {
1722 char tmp[TCP_CA_NAME_MAX];
1724 nla_strlcpy(tmp, nla, sizeof(tmp));
1725 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1726 if (val == TCP_CA_UNSPEC)
1729 val = nla_get_u32(nla);
1731 if (type == RTAX_HOPLIMIT && val > 255)
1733 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1737 __set_bit(type - 1, mxc->mx_valid);
1741 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1742 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1752 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1754 struct net *net = cfg->fc_nlinfo.nl_net;
1755 struct rt6_info *rt = NULL;
1756 struct net_device *dev = NULL;
1757 struct inet6_dev *idev = NULL;
1758 struct fib6_table *table;
1762 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1764 #ifndef CONFIG_IPV6_SUBTREES
1765 if (cfg->fc_src_len)
1768 if (cfg->fc_ifindex) {
1770 dev = dev_get_by_index(net, cfg->fc_ifindex);
1773 idev = in6_dev_get(dev);
1778 if (cfg->fc_metric == 0)
1779 cfg->fc_metric = IP6_RT_PRIO_USER;
1782 if (cfg->fc_nlinfo.nlh &&
1783 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1784 table = fib6_get_table(net, cfg->fc_table);
1786 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1787 table = fib6_new_table(net, cfg->fc_table);
1790 table = fib6_new_table(net, cfg->fc_table);
1796 rt = ip6_dst_alloc(net, NULL,
1797 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1804 if (cfg->fc_flags & RTF_EXPIRES)
1805 rt6_set_expires(rt, jiffies +
1806 clock_t_to_jiffies(cfg->fc_expires));
1808 rt6_clean_expires(rt);
1810 if (cfg->fc_protocol == RTPROT_UNSPEC)
1811 cfg->fc_protocol = RTPROT_BOOT;
1812 rt->rt6i_protocol = cfg->fc_protocol;
1814 addr_type = ipv6_addr_type(&cfg->fc_dst);
1816 if (addr_type & IPV6_ADDR_MULTICAST)
1817 rt->dst.input = ip6_mc_input;
1818 else if (cfg->fc_flags & RTF_LOCAL)
1819 rt->dst.input = ip6_input;
1821 rt->dst.input = ip6_forward;
1823 rt->dst.output = ip6_output;
1825 if (cfg->fc_encap) {
1826 struct lwtunnel_state *lwtstate;
1828 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1829 cfg->fc_encap, AF_INET6, cfg,
1833 rt->dst.lwtstate = lwtstate_get(lwtstate);
1834 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1835 rt->dst.lwtstate->orig_output = rt->dst.output;
1836 rt->dst.output = lwtunnel_output;
1838 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1839 rt->dst.lwtstate->orig_input = rt->dst.input;
1840 rt->dst.input = lwtunnel_input;
1844 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1845 rt->rt6i_dst.plen = cfg->fc_dst_len;
1846 if (rt->rt6i_dst.plen == 128)
1847 rt->dst.flags |= DST_HOST;
1849 #ifdef CONFIG_IPV6_SUBTREES
1850 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1851 rt->rt6i_src.plen = cfg->fc_src_len;
1854 rt->rt6i_metric = cfg->fc_metric;
1856 /* We cannot add true routes via loopback here,
1857 they would result in kernel looping; promote them to reject routes
1859 if ((cfg->fc_flags & RTF_REJECT) ||
1860 (dev && (dev->flags & IFF_LOOPBACK) &&
1861 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1862 !(cfg->fc_flags & RTF_LOCAL))) {
1863 /* hold loopback dev/idev if we haven't done so. */
1864 if (dev != net->loopback_dev) {
1869 dev = net->loopback_dev;
1871 idev = in6_dev_get(dev);
1877 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1878 switch (cfg->fc_type) {
1880 rt->dst.error = -EINVAL;
1881 rt->dst.output = dst_discard_out;
1882 rt->dst.input = dst_discard;
1885 rt->dst.error = -EACCES;
1886 rt->dst.output = ip6_pkt_prohibit_out;
1887 rt->dst.input = ip6_pkt_prohibit;
1890 case RTN_UNREACHABLE:
1892 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1893 : (cfg->fc_type == RTN_UNREACHABLE)
1894 ? -EHOSTUNREACH : -ENETUNREACH;
1895 rt->dst.output = ip6_pkt_discard_out;
1896 rt->dst.input = ip6_pkt_discard;
1902 if (cfg->fc_flags & RTF_GATEWAY) {
1903 const struct in6_addr *gw_addr;
1906 gw_addr = &cfg->fc_gateway;
1907 gwa_type = ipv6_addr_type(gw_addr);
1909 /* if gw_addr is local we will fail to detect this in case
1910 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1911 * will return already-added prefix route via interface that
1912 * prefix route was assigned to, which might be non-loopback.
1915 if (ipv6_chk_addr_and_flags(net, gw_addr,
1916 gwa_type & IPV6_ADDR_LINKLOCAL ?
1920 rt->rt6i_gateway = *gw_addr;
1922 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1923 struct rt6_info *grt;
1925 /* IPv6 strictly inhibits using not link-local
1926 addresses as nexthop address.
1927 Otherwise, router will not able to send redirects.
1928 It is very good, but in some (rare!) circumstances
1929 (SIT, PtP, NBMA NOARP links) it is handy to allow
1930 some exceptions. --ANK
1932 if (!(gwa_type & IPV6_ADDR_UNICAST))
1935 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1937 err = -EHOSTUNREACH;
1941 if (dev != grt->dst.dev) {
1947 idev = grt->rt6i_idev;
1949 in6_dev_hold(grt->rt6i_idev);
1951 if (!(grt->rt6i_flags & RTF_GATEWAY))
1959 if (!dev || (dev->flags & IFF_LOOPBACK))
1967 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1968 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1972 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1973 rt->rt6i_prefsrc.plen = 128;
1975 rt->rt6i_prefsrc.plen = 0;
1977 rt->rt6i_flags = cfg->fc_flags;
1981 rt->rt6i_idev = idev;
1982 rt->rt6i_table = table;
1984 cfg->fc_nlinfo.nl_net = dev_net(dev);
1995 return ERR_PTR(err);
1998 int ip6_route_add(struct fib6_config *cfg)
2000 struct mx6_config mxc = { .mx = NULL, };
2001 struct rt6_info *rt;
2004 rt = ip6_route_info_create(cfg);
2011 err = ip6_convert_metrics(&mxc, cfg);
2015 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2027 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2030 struct fib6_table *table;
2031 struct net *net = dev_net(rt->dst.dev);
2033 if (rt == net->ipv6.ip6_null_entry ||
2034 rt->dst.flags & DST_NOCACHE) {
2039 table = rt->rt6i_table;
2040 write_lock_bh(&table->tb6_lock);
2041 err = fib6_del(rt, info);
2042 write_unlock_bh(&table->tb6_lock);
2049 int ip6_del_rt(struct rt6_info *rt)
2051 struct nl_info info = {
2052 .nl_net = dev_net(rt->dst.dev),
2054 return __ip6_del_rt(rt, &info);
2057 static int ip6_route_del(struct fib6_config *cfg)
2059 struct fib6_table *table;
2060 struct fib6_node *fn;
2061 struct rt6_info *rt;
2064 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2068 read_lock_bh(&table->tb6_lock);
2070 fn = fib6_locate(&table->tb6_root,
2071 &cfg->fc_dst, cfg->fc_dst_len,
2072 &cfg->fc_src, cfg->fc_src_len);
2075 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2076 if ((rt->rt6i_flags & RTF_CACHE) &&
2077 !(cfg->fc_flags & RTF_CACHE))
2079 if (cfg->fc_ifindex &&
2081 rt->dst.dev->ifindex != cfg->fc_ifindex))
2083 if (cfg->fc_flags & RTF_GATEWAY &&
2084 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2086 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2089 read_unlock_bh(&table->tb6_lock);
2091 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2094 read_unlock_bh(&table->tb6_lock);
2099 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2101 struct netevent_redirect netevent;
2102 struct rt6_info *rt, *nrt = NULL;
2103 struct ndisc_options ndopts;
2104 struct inet6_dev *in6_dev;
2105 struct neighbour *neigh;
2107 int optlen, on_link;
2110 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2111 optlen -= sizeof(*msg);
2114 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2118 msg = (struct rd_msg *)icmp6_hdr(skb);
2120 if (ipv6_addr_is_multicast(&msg->dest)) {
2121 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2126 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2128 } else if (ipv6_addr_type(&msg->target) !=
2129 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2130 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2134 in6_dev = __in6_dev_get(skb->dev);
2137 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2141 * The IP source address of the Redirect MUST be the same as the current
2142 * first-hop router for the specified ICMP Destination Address.
2145 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
2146 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2151 if (ndopts.nd_opts_tgt_lladdr) {
2152 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2155 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2160 rt = (struct rt6_info *) dst;
2161 if (rt->rt6i_flags & RTF_REJECT) {
2162 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2166 /* Redirect received -> path was valid.
2167 * Look, redirects are sent only in response to data packets,
2168 * so that this nexthop apparently is reachable. --ANK
2170 dst_confirm(&rt->dst);
2172 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2177 * We have finally decided to accept it.
2180 neigh_update(neigh, lladdr, NUD_STALE,
2181 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2182 NEIGH_UPDATE_F_OVERRIDE|
2183 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2184 NEIGH_UPDATE_F_ISROUTER))
2187 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2191 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2193 nrt->rt6i_flags &= ~RTF_GATEWAY;
2195 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2197 if (ip6_ins_rt(nrt))
2200 netevent.old = &rt->dst;
2201 netevent.new = &nrt->dst;
2202 netevent.daddr = &msg->dest;
2203 netevent.neigh = neigh;
2204 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2206 if (rt->rt6i_flags & RTF_CACHE) {
2207 rt = (struct rt6_info *) dst_clone(&rt->dst);
2212 neigh_release(neigh);
2216 * Misc support functions
2219 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2221 BUG_ON(from->dst.from);
2223 rt->rt6i_flags &= ~RTF_EXPIRES;
2224 dst_hold(&from->dst);
2225 rt->dst.from = &from->dst;
2226 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2229 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2231 rt->dst.input = ort->dst.input;
2232 rt->dst.output = ort->dst.output;
2233 rt->rt6i_dst = ort->rt6i_dst;
2234 rt->dst.error = ort->dst.error;
2235 rt->rt6i_idev = ort->rt6i_idev;
2237 in6_dev_hold(rt->rt6i_idev);
2238 rt->dst.lastuse = jiffies;
2239 rt->rt6i_gateway = ort->rt6i_gateway;
2240 rt->rt6i_flags = ort->rt6i_flags;
2241 rt6_set_from(rt, ort);
2242 rt->rt6i_metric = ort->rt6i_metric;
2243 #ifdef CONFIG_IPV6_SUBTREES
2244 rt->rt6i_src = ort->rt6i_src;
2246 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2247 rt->rt6i_table = ort->rt6i_table;
2248 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2251 #ifdef CONFIG_IPV6_ROUTE_INFO
2252 static struct rt6_info *rt6_get_route_info(struct net_device *dev,
2253 const struct in6_addr *prefix, int prefixlen,
2254 const struct in6_addr *gwaddr)
2256 struct fib6_node *fn;
2257 struct rt6_info *rt = NULL;
2258 struct fib6_table *table;
2260 table = fib6_get_table(dev_net(dev),
2261 addrconf_rt_table(dev, RT6_TABLE_INFO));
2265 read_lock_bh(&table->tb6_lock);
2266 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2270 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2271 if (rt->dst.dev->ifindex != dev->ifindex)
2273 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2275 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2281 read_unlock_bh(&table->tb6_lock);
2285 static struct rt6_info *rt6_add_route_info(struct net_device *dev,
2286 const struct in6_addr *prefix, int prefixlen,
2287 const struct in6_addr *gwaddr, unsigned int pref)
2289 struct fib6_config cfg = {
2290 .fc_metric = IP6_RT_PRIO_USER,
2291 .fc_ifindex = dev->ifindex,
2292 .fc_dst_len = prefixlen,
2293 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2294 RTF_UP | RTF_PREF(pref),
2295 .fc_nlinfo.portid = 0,
2296 .fc_nlinfo.nlh = NULL,
2297 .fc_nlinfo.nl_net = dev_net(dev),
2300 cfg.fc_table = l3mdev_fib_table_by_index(dev_net(dev), dev->ifindex) ? : addrconf_rt_table(dev, RT6_TABLE_INFO);
2301 cfg.fc_dst = *prefix;
2302 cfg.fc_gateway = *gwaddr;
2304 /* We should treat it as a default route if prefix length is 0. */
2306 cfg.fc_flags |= RTF_DEFAULT;
2308 ip6_route_add(&cfg);
2310 return rt6_get_route_info(dev, prefix, prefixlen, gwaddr);
2314 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2316 struct rt6_info *rt;
2317 struct fib6_table *table;
2319 table = fib6_get_table(dev_net(dev),
2320 addrconf_rt_table(dev, RT6_TABLE_MAIN));
2324 read_lock_bh(&table->tb6_lock);
2325 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2326 if (dev == rt->dst.dev &&
2327 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2328 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2333 read_unlock_bh(&table->tb6_lock);
2337 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2338 struct net_device *dev,
2341 struct fib6_config cfg = {
2342 .fc_table = l3mdev_fib_table(dev) ? : addrconf_rt_table(dev, RT6_TABLE_DFLT),
2343 .fc_metric = IP6_RT_PRIO_USER,
2344 .fc_ifindex = dev->ifindex,
2345 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2346 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2347 .fc_nlinfo.portid = 0,
2348 .fc_nlinfo.nlh = NULL,
2349 .fc_nlinfo.nl_net = dev_net(dev),
2352 cfg.fc_gateway = *gwaddr;
2354 ip6_route_add(&cfg);
2356 return rt6_get_dflt_router(gwaddr, dev);
2360 int rt6_addrconf_purge(struct rt6_info *rt, void *arg) {
2361 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2362 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2))
2367 void rt6_purge_dflt_routers(struct net *net)
2369 fib6_clean_all(net, rt6_addrconf_purge, NULL);
2372 static void rtmsg_to_fib6_config(struct net *net,
2373 struct in6_rtmsg *rtmsg,
2374 struct fib6_config *cfg)
2376 memset(cfg, 0, sizeof(*cfg));
2378 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2380 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2381 cfg->fc_metric = rtmsg->rtmsg_metric;
2382 cfg->fc_expires = rtmsg->rtmsg_info;
2383 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2384 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2385 cfg->fc_flags = rtmsg->rtmsg_flags;
2387 cfg->fc_nlinfo.nl_net = net;
2389 cfg->fc_dst = rtmsg->rtmsg_dst;
2390 cfg->fc_src = rtmsg->rtmsg_src;
2391 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2394 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2396 struct fib6_config cfg;
2397 struct in6_rtmsg rtmsg;
2401 case SIOCADDRT: /* Add a route */
2402 case SIOCDELRT: /* Delete a route */
2403 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2405 err = copy_from_user(&rtmsg, arg,
2406 sizeof(struct in6_rtmsg));
2410 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2415 err = ip6_route_add(&cfg);
2418 err = ip6_route_del(&cfg);
2432 * Drop the packet on the floor
2435 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2438 struct dst_entry *dst = skb_dst(skb);
2439 switch (ipstats_mib_noroutes) {
2440 case IPSTATS_MIB_INNOROUTES:
2441 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2442 if (type == IPV6_ADDR_ANY) {
2443 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2444 IPSTATS_MIB_INADDRERRORS);
2448 case IPSTATS_MIB_OUTNOROUTES:
2449 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2450 ipstats_mib_noroutes);
2453 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2458 static int ip6_pkt_discard(struct sk_buff *skb)
2460 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2463 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2465 skb->dev = skb_dst(skb)->dev;
2466 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2469 static int ip6_pkt_prohibit(struct sk_buff *skb)
2471 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2474 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2476 skb->dev = skb_dst(skb)->dev;
2477 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2481 * Allocate a dst for local (unicast / anycast) address.
2484 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2485 const struct in6_addr *addr,
2489 struct net *net = dev_net(idev->dev);
2490 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2493 return ERR_PTR(-ENOMEM);
2497 rt->dst.flags |= DST_HOST;
2498 rt->dst.input = ip6_input;
2499 rt->dst.output = ip6_output;
2500 rt->rt6i_idev = idev;
2502 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2504 rt->rt6i_flags |= RTF_ANYCAST;
2506 rt->rt6i_flags |= RTF_LOCAL;
2508 rt->rt6i_gateway = *addr;
2509 rt->rt6i_dst.addr = *addr;
2510 rt->rt6i_dst.plen = 128;
2511 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2512 rt->rt6i_table = fib6_get_table(net, tb_id);
2513 rt->dst.flags |= DST_NOCACHE;
2515 atomic_set(&rt->dst.__refcnt, 1);
2520 int ip6_route_get_saddr(struct net *net,
2521 struct rt6_info *rt,
2522 const struct in6_addr *daddr,
2524 struct in6_addr *saddr)
2526 struct inet6_dev *idev =
2527 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
2529 if (rt && rt->rt6i_prefsrc.plen)
2530 *saddr = rt->rt6i_prefsrc.addr;
2532 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2533 daddr, prefs, saddr);
2537 /* remove deleted ip from prefsrc entries */
2538 struct arg_dev_net_ip {
2539 struct net_device *dev;
2541 struct in6_addr *addr;
2544 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2546 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2547 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2548 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2550 if (((void *)rt->dst.dev == dev || !dev) &&
2551 rt != net->ipv6.ip6_null_entry &&
2552 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2553 /* remove prefsrc entry */
2554 rt->rt6i_prefsrc.plen = 0;
2559 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2561 struct net *net = dev_net(ifp->idev->dev);
2562 struct arg_dev_net_ip adni = {
2563 .dev = ifp->idev->dev,
2567 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2570 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2571 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2573 /* Remove routers and update dst entries when gateway turn into host. */
2574 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2576 struct in6_addr *gateway = (struct in6_addr *)arg;
2578 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2579 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2580 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2586 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2588 fib6_clean_all(net, fib6_clean_tohost, gateway);
2591 struct arg_dev_net {
2592 struct net_device *dev;
2596 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2598 const struct arg_dev_net *adn = arg;
2599 const struct net_device *dev = adn->dev;
2601 if ((rt->dst.dev == dev || !dev) &&
2602 rt != adn->net->ipv6.ip6_null_entry)
2608 void rt6_ifdown(struct net *net, struct net_device *dev)
2610 struct arg_dev_net adn = {
2615 fib6_clean_all(net, fib6_ifdown, &adn);
2616 icmp6_clean_all(fib6_ifdown, &adn);
2618 rt6_uncached_list_flush_dev(net, dev);
2621 struct rt6_mtu_change_arg {
2622 struct net_device *dev;
2626 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2628 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2629 struct inet6_dev *idev;
2631 /* In IPv6 pmtu discovery is not optional,
2632 so that RTAX_MTU lock cannot disable it.
2633 We still use this lock to block changes
2634 caused by addrconf/ndisc.
2637 idev = __in6_dev_get(arg->dev);
2641 /* For administrative MTU increase, there is no way to discover
2642 IPv6 PMTU increase, so PMTU increase should be updated here.
2643 Since RFC 1981 doesn't include administrative MTU increase
2644 update PMTU increase is a MUST. (i.e. jumbo frame)
2647 If new MTU is less than route PMTU, this new MTU will be the
2648 lowest MTU in the path, update the route PMTU to reflect PMTU
2649 decreases; if new MTU is greater than route PMTU, and the
2650 old MTU is the lowest MTU in the path, update the route PMTU
2651 to reflect the increase. In this case if the other nodes' MTU
2652 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2655 if (rt->dst.dev == arg->dev &&
2656 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2657 if (rt->rt6i_flags & RTF_CACHE) {
2658 /* For RTF_CACHE with rt6i_pmtu == 0
2659 * (i.e. a redirected route),
2660 * the metrics of its rt->dst.from has already
2663 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2664 rt->rt6i_pmtu = arg->mtu;
2665 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2666 (dst_mtu(&rt->dst) < arg->mtu &&
2667 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2668 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2674 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2676 struct rt6_mtu_change_arg arg = {
2681 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2684 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2685 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2686 [RTA_OIF] = { .type = NLA_U32 },
2687 [RTA_IIF] = { .type = NLA_U32 },
2688 [RTA_PRIORITY] = { .type = NLA_U32 },
2689 [RTA_METRICS] = { .type = NLA_NESTED },
2690 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2691 [RTA_PREF] = { .type = NLA_U8 },
2692 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2693 [RTA_ENCAP] = { .type = NLA_NESTED },
2694 [RTA_UID] = { .type = NLA_U32 },
2697 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2698 struct fib6_config *cfg)
2701 struct nlattr *tb[RTA_MAX+1];
2705 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2710 rtm = nlmsg_data(nlh);
2711 memset(cfg, 0, sizeof(*cfg));
2713 cfg->fc_table = rtm->rtm_table;
2714 cfg->fc_dst_len = rtm->rtm_dst_len;
2715 cfg->fc_src_len = rtm->rtm_src_len;
2716 cfg->fc_flags = RTF_UP;
2717 cfg->fc_protocol = rtm->rtm_protocol;
2718 cfg->fc_type = rtm->rtm_type;
2720 if (rtm->rtm_type == RTN_UNREACHABLE ||
2721 rtm->rtm_type == RTN_BLACKHOLE ||
2722 rtm->rtm_type == RTN_PROHIBIT ||
2723 rtm->rtm_type == RTN_THROW)
2724 cfg->fc_flags |= RTF_REJECT;
2726 if (rtm->rtm_type == RTN_LOCAL)
2727 cfg->fc_flags |= RTF_LOCAL;
2729 if (rtm->rtm_flags & RTM_F_CLONED)
2730 cfg->fc_flags |= RTF_CACHE;
2732 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2733 cfg->fc_nlinfo.nlh = nlh;
2734 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2736 if (tb[RTA_GATEWAY]) {
2737 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2738 cfg->fc_flags |= RTF_GATEWAY;
2742 int plen = (rtm->rtm_dst_len + 7) >> 3;
2744 if (nla_len(tb[RTA_DST]) < plen)
2747 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2751 int plen = (rtm->rtm_src_len + 7) >> 3;
2753 if (nla_len(tb[RTA_SRC]) < plen)
2756 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2759 if (tb[RTA_PREFSRC])
2760 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2763 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2765 if (tb[RTA_PRIORITY])
2766 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2768 if (tb[RTA_METRICS]) {
2769 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2770 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2774 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2776 if (tb[RTA_MULTIPATH]) {
2777 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2778 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2782 pref = nla_get_u8(tb[RTA_PREF]);
2783 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2784 pref != ICMPV6_ROUTER_PREF_HIGH)
2785 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2786 cfg->fc_flags |= RTF_PREF(pref);
2790 cfg->fc_encap = tb[RTA_ENCAP];
2792 if (tb[RTA_ENCAP_TYPE])
2793 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2801 struct rt6_info *rt6_info;
2802 struct fib6_config r_cfg;
2803 struct mx6_config mxc;
2804 struct list_head next;
2807 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2811 list_for_each_entry(nh, rt6_nh_list, next) {
2812 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2813 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2814 nh->r_cfg.fc_ifindex);
2818 static int ip6_route_info_append(struct list_head *rt6_nh_list,
2819 struct rt6_info *rt, struct fib6_config *r_cfg)
2822 struct rt6_info *rtnh;
2825 list_for_each_entry(nh, rt6_nh_list, next) {
2826 /* check if rt6_info already exists */
2827 rtnh = nh->rt6_info;
2829 if (rtnh->dst.dev == rt->dst.dev &&
2830 rtnh->rt6i_idev == rt->rt6i_idev &&
2831 ipv6_addr_equal(&rtnh->rt6i_gateway,
2836 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2840 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2845 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2846 list_add_tail(&nh->next, rt6_nh_list);
2851 static int ip6_route_multipath_add(struct fib6_config *cfg)
2853 struct fib6_config r_cfg;
2854 struct rtnexthop *rtnh;
2855 struct rt6_info *rt;
2856 struct rt6_nh *err_nh;
2857 struct rt6_nh *nh, *nh_safe;
2862 int replace = (cfg->fc_nlinfo.nlh &&
2863 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2864 LIST_HEAD(rt6_nh_list);
2866 remaining = cfg->fc_mp_len;
2867 rtnh = (struct rtnexthop *)cfg->fc_mp;
2869 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2870 * rt6_info structs per nexthop
2872 while (rtnh_ok(rtnh, remaining)) {
2873 memcpy(&r_cfg, cfg, sizeof(*cfg));
2874 if (rtnh->rtnh_ifindex)
2875 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2877 attrlen = rtnh_attrlen(rtnh);
2879 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2881 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2883 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2884 r_cfg.fc_flags |= RTF_GATEWAY;
2886 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2887 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2889 r_cfg.fc_encap_type = nla_get_u16(nla);
2892 rt = ip6_route_info_create(&r_cfg);
2899 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
2905 rtnh = rtnh_next(rtnh, &remaining);
2909 list_for_each_entry(nh, &rt6_nh_list, next) {
2910 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2911 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2912 nh->rt6_info = NULL;
2915 ip6_print_replace_route_err(&rt6_nh_list);
2920 /* Because each route is added like a single route we remove
2921 * these flags after the first nexthop: if there is a collision,
2922 * we have already failed to add the first nexthop:
2923 * fib6_add_rt2node() has rejected it; when replacing, old
2924 * nexthops have been replaced by first new, the rest should
2927 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2935 /* Delete routes that were already added */
2936 list_for_each_entry(nh, &rt6_nh_list, next) {
2939 ip6_route_del(&nh->r_cfg);
2943 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
2945 dst_free(&nh->rt6_info->dst);
2947 list_del(&nh->next);
2954 static int ip6_route_multipath_del(struct fib6_config *cfg)
2956 struct fib6_config r_cfg;
2957 struct rtnexthop *rtnh;
2960 int err = 1, last_err = 0;
2962 remaining = cfg->fc_mp_len;
2963 rtnh = (struct rtnexthop *)cfg->fc_mp;
2965 /* Parse a Multipath Entry */
2966 while (rtnh_ok(rtnh, remaining)) {
2967 memcpy(&r_cfg, cfg, sizeof(*cfg));
2968 if (rtnh->rtnh_ifindex)
2969 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2971 attrlen = rtnh_attrlen(rtnh);
2973 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2975 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2977 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2978 r_cfg.fc_flags |= RTF_GATEWAY;
2981 err = ip6_route_del(&r_cfg);
2985 rtnh = rtnh_next(rtnh, &remaining);
2991 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2993 struct fib6_config cfg;
2996 err = rtm_to_fib6_config(skb, nlh, &cfg);
3001 return ip6_route_multipath_del(&cfg);
3003 return ip6_route_del(&cfg);
3006 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3008 struct fib6_config cfg;
3011 err = rtm_to_fib6_config(skb, nlh, &cfg);
3016 return ip6_route_multipath_add(&cfg);
3018 return ip6_route_add(&cfg);
3021 static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
3023 return NLMSG_ALIGN(sizeof(struct rtmsg))
3024 + nla_total_size(16) /* RTA_SRC */
3025 + nla_total_size(16) /* RTA_DST */
3026 + nla_total_size(16) /* RTA_GATEWAY */
3027 + nla_total_size(16) /* RTA_PREFSRC */
3028 + nla_total_size(4) /* RTA_TABLE */
3029 + nla_total_size(4) /* RTA_IIF */
3030 + nla_total_size(4) /* RTA_OIF */
3031 + nla_total_size(4) /* RTA_PRIORITY */
3032 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3033 + nla_total_size(sizeof(struct rta_cacheinfo))
3034 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3035 + nla_total_size(1) /* RTA_PREF */
3036 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3039 static int rt6_fill_node(struct net *net,
3040 struct sk_buff *skb, struct rt6_info *rt,
3041 struct in6_addr *dst, struct in6_addr *src,
3042 int iif, int type, u32 portid, u32 seq,
3043 int prefix, int nowait, unsigned int flags)
3045 u32 metrics[RTAX_MAX];
3047 struct nlmsghdr *nlh;
3051 if (prefix) { /* user wants prefix routes only */
3052 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3053 /* success since this is not a prefix route */
3058 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3062 rtm = nlmsg_data(nlh);
3063 rtm->rtm_family = AF_INET6;
3064 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3065 rtm->rtm_src_len = rt->rt6i_src.plen;
3068 table = rt->rt6i_table->tb6_id;
3070 table = RT6_TABLE_UNSPEC;
3071 rtm->rtm_table = table;
3072 if (nla_put_u32(skb, RTA_TABLE, table))
3073 goto nla_put_failure;
3074 if (rt->rt6i_flags & RTF_REJECT) {
3075 switch (rt->dst.error) {
3077 rtm->rtm_type = RTN_BLACKHOLE;
3080 rtm->rtm_type = RTN_PROHIBIT;
3083 rtm->rtm_type = RTN_THROW;
3086 rtm->rtm_type = RTN_UNREACHABLE;
3090 else if (rt->rt6i_flags & RTF_LOCAL)
3091 rtm->rtm_type = RTN_LOCAL;
3092 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3093 rtm->rtm_type = RTN_LOCAL;
3095 rtm->rtm_type = RTN_UNICAST;
3097 if (!netif_carrier_ok(rt->dst.dev)) {
3098 rtm->rtm_flags |= RTNH_F_LINKDOWN;
3099 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3100 rtm->rtm_flags |= RTNH_F_DEAD;
3102 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3103 rtm->rtm_protocol = rt->rt6i_protocol;
3104 if (rt->rt6i_flags & RTF_DYNAMIC)
3105 rtm->rtm_protocol = RTPROT_REDIRECT;
3106 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3107 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3108 rtm->rtm_protocol = RTPROT_RA;
3110 rtm->rtm_protocol = RTPROT_KERNEL;
3113 if (rt->rt6i_flags & RTF_CACHE)
3114 rtm->rtm_flags |= RTM_F_CLONED;
3117 if (nla_put_in6_addr(skb, RTA_DST, dst))
3118 goto nla_put_failure;
3119 rtm->rtm_dst_len = 128;
3120 } else if (rtm->rtm_dst_len)
3121 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3122 goto nla_put_failure;
3123 #ifdef CONFIG_IPV6_SUBTREES
3125 if (nla_put_in6_addr(skb, RTA_SRC, src))
3126 goto nla_put_failure;
3127 rtm->rtm_src_len = 128;
3128 } else if (rtm->rtm_src_len &&
3129 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3130 goto nla_put_failure;
3133 #ifdef CONFIG_IPV6_MROUTE
3134 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3135 int err = ip6mr_get_route(net, skb, rtm, nowait,
3142 goto nla_put_failure;
3144 if (err == -EMSGSIZE)
3145 goto nla_put_failure;
3150 if (nla_put_u32(skb, RTA_IIF, iif))
3151 goto nla_put_failure;
3153 struct in6_addr saddr_buf;
3154 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3155 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3156 goto nla_put_failure;
3159 if (rt->rt6i_prefsrc.plen) {
3160 struct in6_addr saddr_buf;
3161 saddr_buf = rt->rt6i_prefsrc.addr;
3162 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3163 goto nla_put_failure;
3166 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3168 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3169 if (rtnetlink_put_metrics(skb, metrics) < 0)
3170 goto nla_put_failure;
3172 if (rt->rt6i_flags & RTF_GATEWAY) {
3173 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3174 goto nla_put_failure;
3178 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3179 goto nla_put_failure;
3180 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3181 goto nla_put_failure;
3183 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3185 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3186 goto nla_put_failure;
3188 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3189 goto nla_put_failure;
3191 if (lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0)
3192 goto nla_put_failure;
3194 nlmsg_end(skb, nlh);
3198 nlmsg_cancel(skb, nlh);
3202 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3204 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3207 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3208 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3209 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3213 return rt6_fill_node(arg->net,
3214 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3215 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3216 prefix, 0, NLM_F_MULTI);
3219 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3221 struct net *net = sock_net(in_skb->sk);
3222 struct nlattr *tb[RTA_MAX+1];
3223 struct rt6_info *rt;
3224 struct sk_buff *skb;
3227 int err, iif = 0, oif = 0;
3229 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3234 memset(&fl6, 0, sizeof(fl6));
3237 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3240 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3244 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3247 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3251 iif = nla_get_u32(tb[RTA_IIF]);
3254 oif = nla_get_u32(tb[RTA_OIF]);
3257 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3260 fl6.flowi6_uid = make_kuid(current_user_ns(),
3261 nla_get_u32(tb[RTA_UID]));
3263 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
3266 struct net_device *dev;
3269 dev = __dev_get_by_index(net, iif);
3275 fl6.flowi6_iif = iif;
3277 if (!ipv6_addr_any(&fl6.saddr))
3278 flags |= RT6_LOOKUP_F_HAS_SADDR;
3280 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3283 fl6.flowi6_oif = oif;
3285 if (netif_index_is_l3_master(net, oif)) {
3286 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3287 FLOWI_FLAG_SKIP_NH_OIF;
3290 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3293 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3300 /* Reserve room for dummy headers, this skb can pass
3301 through good chunk of routing engine.
3303 skb_reset_mac_header(skb);
3304 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3306 skb_dst_set(skb, &rt->dst);
3308 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3309 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3310 nlh->nlmsg_seq, 0, 0, 0);
3316 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3321 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3322 unsigned int nlm_flags)
3324 struct sk_buff *skb;
3325 struct net *net = info->nl_net;
3330 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3332 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3336 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3337 event, info->portid, seq, 0, 0, nlm_flags);
3339 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3340 WARN_ON(err == -EMSGSIZE);
3344 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3345 info->nlh, gfp_any());
3349 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3352 static int ip6_route_dev_notify(struct notifier_block *this,
3353 unsigned long event, void *ptr)
3355 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3356 struct net *net = dev_net(dev);
3358 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3359 net->ipv6.ip6_null_entry->dst.dev = dev;
3360 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3361 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3362 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3363 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3364 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3365 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3376 #ifdef CONFIG_PROC_FS
3378 static const struct file_operations ipv6_route_proc_fops = {
3379 .owner = THIS_MODULE,
3380 .open = ipv6_route_open,
3382 .llseek = seq_lseek,
3383 .release = seq_release_net,
3386 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3388 struct net *net = (struct net *)seq->private;
3389 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3390 net->ipv6.rt6_stats->fib_nodes,
3391 net->ipv6.rt6_stats->fib_route_nodes,
3392 net->ipv6.rt6_stats->fib_rt_alloc,
3393 net->ipv6.rt6_stats->fib_rt_entries,
3394 net->ipv6.rt6_stats->fib_rt_cache,
3395 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3396 net->ipv6.rt6_stats->fib_discarded_routes);
3401 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3403 return single_open_net(inode, file, rt6_stats_seq_show);
3406 static const struct file_operations rt6_stats_seq_fops = {
3407 .owner = THIS_MODULE,
3408 .open = rt6_stats_seq_open,
3410 .llseek = seq_lseek,
3411 .release = single_release_net,
3413 #endif /* CONFIG_PROC_FS */
3415 #ifdef CONFIG_SYSCTL
3418 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3419 void __user *buffer, size_t *lenp, loff_t *ppos)
3426 net = (struct net *)ctl->extra1;
3427 delay = net->ipv6.sysctl.flush_delay;
3428 proc_dointvec(ctl, write, buffer, lenp, ppos);
3429 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3433 struct ctl_table ipv6_route_table_template[] = {
3435 .procname = "flush",
3436 .data = &init_net.ipv6.sysctl.flush_delay,
3437 .maxlen = sizeof(int),
3439 .proc_handler = ipv6_sysctl_rtcache_flush
3442 .procname = "gc_thresh",
3443 .data = &ip6_dst_ops_template.gc_thresh,
3444 .maxlen = sizeof(int),
3446 .proc_handler = proc_dointvec,
3449 .procname = "max_size",
3450 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3451 .maxlen = sizeof(int),
3453 .proc_handler = proc_dointvec,
3456 .procname = "gc_min_interval",
3457 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3458 .maxlen = sizeof(int),
3460 .proc_handler = proc_dointvec_jiffies,
3463 .procname = "gc_timeout",
3464 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3465 .maxlen = sizeof(int),
3467 .proc_handler = proc_dointvec_jiffies,
3470 .procname = "gc_interval",
3471 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3472 .maxlen = sizeof(int),
3474 .proc_handler = proc_dointvec_jiffies,
3477 .procname = "gc_elasticity",
3478 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3479 .maxlen = sizeof(int),
3481 .proc_handler = proc_dointvec,
3484 .procname = "mtu_expires",
3485 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3486 .maxlen = sizeof(int),
3488 .proc_handler = proc_dointvec_jiffies,
3491 .procname = "min_adv_mss",
3492 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3493 .maxlen = sizeof(int),
3495 .proc_handler = proc_dointvec,
3498 .procname = "gc_min_interval_ms",
3499 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3500 .maxlen = sizeof(int),
3502 .proc_handler = proc_dointvec_ms_jiffies,
3507 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3509 struct ctl_table *table;
3511 table = kmemdup(ipv6_route_table_template,
3512 sizeof(ipv6_route_table_template),
3516 table[0].data = &net->ipv6.sysctl.flush_delay;
3517 table[0].extra1 = net;
3518 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3519 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3520 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3521 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3522 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3523 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3524 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3525 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3526 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3528 /* Don't export sysctls to unprivileged users */
3529 if (net->user_ns != &init_user_ns)
3530 table[0].procname = NULL;
3537 static int __net_init ip6_route_net_init(struct net *net)
3541 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3542 sizeof(net->ipv6.ip6_dst_ops));
3544 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3545 goto out_ip6_dst_ops;
3547 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3548 sizeof(*net->ipv6.ip6_null_entry),
3550 if (!net->ipv6.ip6_null_entry)
3551 goto out_ip6_dst_entries;
3552 net->ipv6.ip6_null_entry->dst.path =
3553 (struct dst_entry *)net->ipv6.ip6_null_entry;
3554 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3555 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3556 ip6_template_metrics, true);
3558 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3559 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3560 sizeof(*net->ipv6.ip6_prohibit_entry),
3562 if (!net->ipv6.ip6_prohibit_entry)
3563 goto out_ip6_null_entry;
3564 net->ipv6.ip6_prohibit_entry->dst.path =
3565 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3566 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3567 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3568 ip6_template_metrics, true);
3570 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3571 sizeof(*net->ipv6.ip6_blk_hole_entry),
3573 if (!net->ipv6.ip6_blk_hole_entry)
3574 goto out_ip6_prohibit_entry;
3575 net->ipv6.ip6_blk_hole_entry->dst.path =
3576 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3577 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3578 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3579 ip6_template_metrics, true);
3582 net->ipv6.sysctl.flush_delay = 0;
3583 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3584 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3585 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3586 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3587 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3588 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3589 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3591 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3597 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3598 out_ip6_prohibit_entry:
3599 kfree(net->ipv6.ip6_prohibit_entry);
3601 kfree(net->ipv6.ip6_null_entry);
3603 out_ip6_dst_entries:
3604 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3609 static void __net_exit ip6_route_net_exit(struct net *net)
3611 kfree(net->ipv6.ip6_null_entry);
3612 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3613 kfree(net->ipv6.ip6_prohibit_entry);
3614 kfree(net->ipv6.ip6_blk_hole_entry);
3616 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3619 static int __net_init ip6_route_net_init_late(struct net *net)
3621 #ifdef CONFIG_PROC_FS
3622 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3623 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3628 static void __net_exit ip6_route_net_exit_late(struct net *net)
3630 #ifdef CONFIG_PROC_FS
3631 remove_proc_entry("ipv6_route", net->proc_net);
3632 remove_proc_entry("rt6_stats", net->proc_net);
3636 static struct pernet_operations ip6_route_net_ops = {
3637 .init = ip6_route_net_init,
3638 .exit = ip6_route_net_exit,
3641 static int __net_init ipv6_inetpeer_init(struct net *net)
3643 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3647 inet_peer_base_init(bp);
3648 net->ipv6.peers = bp;
3652 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3654 struct inet_peer_base *bp = net->ipv6.peers;
3656 net->ipv6.peers = NULL;
3657 inetpeer_invalidate_tree(bp);
3661 static struct pernet_operations ipv6_inetpeer_ops = {
3662 .init = ipv6_inetpeer_init,
3663 .exit = ipv6_inetpeer_exit,
3666 static struct pernet_operations ip6_route_net_late_ops = {
3667 .init = ip6_route_net_init_late,
3668 .exit = ip6_route_net_exit_late,
3671 static struct notifier_block ip6_route_dev_notifier = {
3672 .notifier_call = ip6_route_dev_notify,
3676 int __init ip6_route_init(void)
3682 ip6_dst_ops_template.kmem_cachep =
3683 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3684 SLAB_HWCACHE_ALIGN, NULL);
3685 if (!ip6_dst_ops_template.kmem_cachep)
3688 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3690 goto out_kmem_cache;
3692 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3694 goto out_dst_entries;
3696 ret = register_pernet_subsys(&ip6_route_net_ops);
3698 goto out_register_inetpeer;
3700 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3702 /* Registering of the loopback is done before this portion of code,
3703 * the loopback reference in rt6_info will not be taken, do it
3704 * manually for init_net */
3705 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3706 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3707 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3708 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3709 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3710 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3711 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3715 goto out_register_subsys;
3721 ret = fib6_rules_init();
3725 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3727 goto fib6_rules_init;
3730 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3731 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3732 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3733 goto out_register_late_subsys;
3735 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3737 goto out_register_late_subsys;
3739 for_each_possible_cpu(cpu) {
3740 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3742 INIT_LIST_HEAD(&ul->head);
3743 spin_lock_init(&ul->lock);
3749 out_register_late_subsys:
3750 unregister_pernet_subsys(&ip6_route_net_late_ops);
3752 fib6_rules_cleanup();
3757 out_register_subsys:
3758 unregister_pernet_subsys(&ip6_route_net_ops);
3759 out_register_inetpeer:
3760 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3762 dst_entries_destroy(&ip6_dst_blackhole_ops);
3764 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3768 void ip6_route_cleanup(void)
3770 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3771 unregister_pernet_subsys(&ip6_route_net_late_ops);
3772 fib6_rules_cleanup();
3775 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3776 unregister_pernet_subsys(&ip6_route_net_ops);
3777 dst_entries_destroy(&ip6_dst_blackhole_ops);
3778 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);