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>
65 #include <asm/uaccess.h>
68 #include <linux/sysctl.h>
72 RT6_NUD_FAIL_HARD = -3,
73 RT6_NUD_FAIL_PROBE = -2,
74 RT6_NUD_FAIL_DO_RR = -1,
78 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
79 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
80 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
81 static unsigned int ip6_mtu(const struct dst_entry *dst);
82 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
83 static void ip6_dst_destroy(struct dst_entry *);
84 static void ip6_dst_ifdown(struct dst_entry *,
85 struct net_device *dev, int how);
86 static int ip6_dst_gc(struct dst_ops *ops);
88 static int ip6_pkt_discard(struct sk_buff *skb);
89 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
90 static int ip6_pkt_prohibit(struct sk_buff *skb);
91 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb);
92 static void ip6_link_failure(struct sk_buff *skb);
93 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
94 struct sk_buff *skb, u32 mtu);
95 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
97 static void rt6_dst_from_metrics_check(struct rt6_info *rt);
98 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
100 #ifdef CONFIG_IPV6_ROUTE_INFO
101 static struct rt6_info *rt6_add_route_info(struct net *net,
102 const struct in6_addr *prefix, int prefixlen,
103 const struct in6_addr *gwaddr, int ifindex,
105 static struct rt6_info *rt6_get_route_info(struct net *net,
106 const struct in6_addr *prefix, int prefixlen,
107 const struct in6_addr *gwaddr, int ifindex);
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 for_each_possible_cpu(cpu) {
146 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
149 spin_lock_bh(&ul->lock);
150 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
151 struct inet6_dev *rt_idev = rt->rt6i_idev;
152 struct net_device *rt_dev = rt->dst.dev;
154 if (rt_idev && (rt_idev->dev == dev || !dev) &&
155 rt_idev->dev != loopback_dev) {
156 rt->rt6i_idev = in6_dev_get(loopback_dev);
157 in6_dev_put(rt_idev);
160 if (rt_dev && (rt_dev == dev || !dev) &&
161 rt_dev != loopback_dev) {
162 rt->dst.dev = loopback_dev;
163 dev_hold(rt->dst.dev);
167 spin_unlock_bh(&ul->lock);
171 static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
173 return dst_metrics_write_ptr(rt->dst.from);
176 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
178 struct rt6_info *rt = (struct rt6_info *)dst;
180 if (rt->rt6i_flags & RTF_PCPU)
181 return rt6_pcpu_cow_metrics(rt);
182 else if (rt->rt6i_flags & RTF_CACHE)
185 return dst_cow_metrics_generic(dst, old);
188 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
192 struct in6_addr *p = &rt->rt6i_gateway;
194 if (!ipv6_addr_any(p))
195 return (const void *) p;
197 return &ipv6_hdr(skb)->daddr;
201 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
205 struct rt6_info *rt = (struct rt6_info *) dst;
208 daddr = choose_neigh_daddr(rt, skb, daddr);
209 n = __ipv6_neigh_lookup(dst->dev, daddr);
212 return neigh_create(&nd_tbl, daddr, dst->dev);
215 static struct dst_ops ip6_dst_ops_template = {
219 .check = ip6_dst_check,
220 .default_advmss = ip6_default_advmss,
222 .cow_metrics = ipv6_cow_metrics,
223 .destroy = ip6_dst_destroy,
224 .ifdown = ip6_dst_ifdown,
225 .negative_advice = ip6_negative_advice,
226 .link_failure = ip6_link_failure,
227 .update_pmtu = ip6_rt_update_pmtu,
228 .redirect = rt6_do_redirect,
229 .local_out = __ip6_local_out,
230 .neigh_lookup = ip6_neigh_lookup,
233 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
235 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
237 return mtu ? : dst->dev->mtu;
240 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
241 struct sk_buff *skb, u32 mtu)
245 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
250 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
256 static struct dst_ops ip6_dst_blackhole_ops = {
258 .destroy = ip6_dst_destroy,
259 .check = ip6_dst_check,
260 .mtu = ip6_blackhole_mtu,
261 .default_advmss = ip6_default_advmss,
262 .update_pmtu = ip6_rt_blackhole_update_pmtu,
263 .redirect = ip6_rt_blackhole_redirect,
264 .cow_metrics = ip6_rt_blackhole_cow_metrics,
265 .neigh_lookup = ip6_neigh_lookup,
268 static const u32 ip6_template_metrics[RTAX_MAX] = {
269 [RTAX_HOPLIMIT - 1] = 0,
272 static const struct rt6_info ip6_null_entry_template = {
274 .__refcnt = ATOMIC_INIT(1),
276 .obsolete = DST_OBSOLETE_FORCE_CHK,
277 .error = -ENETUNREACH,
278 .input = ip6_pkt_discard,
279 .output = ip6_pkt_discard_out,
281 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
282 .rt6i_protocol = RTPROT_KERNEL,
283 .rt6i_metric = ~(u32) 0,
284 .rt6i_ref = ATOMIC_INIT(1),
287 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
289 static const struct rt6_info ip6_prohibit_entry_template = {
291 .__refcnt = ATOMIC_INIT(1),
293 .obsolete = DST_OBSOLETE_FORCE_CHK,
295 .input = ip6_pkt_prohibit,
296 .output = ip6_pkt_prohibit_out,
298 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
299 .rt6i_protocol = RTPROT_KERNEL,
300 .rt6i_metric = ~(u32) 0,
301 .rt6i_ref = ATOMIC_INIT(1),
304 static const struct rt6_info ip6_blk_hole_entry_template = {
306 .__refcnt = ATOMIC_INIT(1),
308 .obsolete = DST_OBSOLETE_FORCE_CHK,
310 .input = dst_discard,
311 .output = dst_discard_sk,
313 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
314 .rt6i_protocol = RTPROT_KERNEL,
315 .rt6i_metric = ~(u32) 0,
316 .rt6i_ref = ATOMIC_INIT(1),
321 /* allocate dst with ip6_dst_ops */
322 static struct rt6_info *__ip6_dst_alloc(struct net *net,
323 struct net_device *dev,
326 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
327 0, DST_OBSOLETE_FORCE_CHK, flags);
330 struct dst_entry *dst = &rt->dst;
332 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
333 INIT_LIST_HEAD(&rt->rt6i_siblings);
334 INIT_LIST_HEAD(&rt->rt6i_uncached);
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 if (time_after(jiffies, rt->dst.expires))
411 } else if (rt->dst.from) {
412 return rt6_check_expired((struct rt6_info *) rt->dst.from);
417 /* Multipath route selection:
418 * Hash based function using packet header and flowlabel.
419 * Adapted from fib_info_hashfn()
421 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
422 const struct flowi6 *fl6)
424 unsigned int val = fl6->flowi6_proto;
426 val ^= ipv6_addr_hash(&fl6->daddr);
427 val ^= ipv6_addr_hash(&fl6->saddr);
429 /* Work only if this not encapsulated */
430 switch (fl6->flowi6_proto) {
434 val ^= (__force u16)fl6->fl6_sport;
435 val ^= (__force u16)fl6->fl6_dport;
439 val ^= (__force u16)fl6->fl6_icmp_type;
440 val ^= (__force u16)fl6->fl6_icmp_code;
443 /* RFC6438 recommands to use flowlabel */
444 val ^= (__force u32)fl6->flowlabel;
446 /* Perhaps, we need to tune, this function? */
447 val = val ^ (val >> 7) ^ (val >> 12);
448 return val % candidate_count;
451 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
452 struct flowi6 *fl6, int oif,
455 struct rt6_info *sibling, *next_sibling;
458 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
459 /* Don't change the route, if route_choosen == 0
460 * (siblings does not include ourself)
463 list_for_each_entry_safe(sibling, next_sibling,
464 &match->rt6i_siblings, rt6i_siblings) {
466 if (route_choosen == 0) {
467 if (rt6_score_route(sibling, oif, strict) < 0)
477 * Route lookup. Any table->tb6_lock is implied.
480 static inline struct rt6_info *rt6_device_match(struct net *net,
482 const struct in6_addr *saddr,
486 struct rt6_info *local = NULL;
487 struct rt6_info *sprt;
489 if (!oif && ipv6_addr_any(saddr))
492 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
493 struct net_device *dev = sprt->dst.dev;
496 if (dev->ifindex == oif)
498 if (dev->flags & IFF_LOOPBACK) {
499 if (!sprt->rt6i_idev ||
500 sprt->rt6i_idev->dev->ifindex != oif) {
501 if (flags & RT6_LOOKUP_F_IFACE && oif)
503 if (local && (!oif ||
504 local->rt6i_idev->dev->ifindex == oif))
510 if (ipv6_chk_addr(net, saddr, dev,
511 flags & RT6_LOOKUP_F_IFACE))
520 if (flags & RT6_LOOKUP_F_IFACE)
521 return net->ipv6.ip6_null_entry;
527 #ifdef CONFIG_IPV6_ROUTER_PREF
528 struct __rt6_probe_work {
529 struct work_struct work;
530 struct in6_addr target;
531 struct net_device *dev;
534 static void rt6_probe_deferred(struct work_struct *w)
536 struct in6_addr mcaddr;
537 struct __rt6_probe_work *work =
538 container_of(w, struct __rt6_probe_work, work);
540 addrconf_addr_solict_mult(&work->target, &mcaddr);
541 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL, NULL);
546 static void rt6_probe(struct rt6_info *rt)
548 struct __rt6_probe_work *work;
549 struct neighbour *neigh;
551 * Okay, this does not seem to be appropriate
552 * for now, however, we need to check if it
553 * is really so; aka Router Reachability Probing.
555 * Router Reachability Probe MUST be rate-limited
556 * to no more than one per minute.
558 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
561 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
563 if (neigh->nud_state & NUD_VALID)
567 write_lock(&neigh->lock);
568 if (!(neigh->nud_state & NUD_VALID) &&
571 rt->rt6i_idev->cnf.rtr_probe_interval)) {
572 work = kmalloc(sizeof(*work), GFP_ATOMIC);
574 __neigh_set_probe_once(neigh);
576 write_unlock(&neigh->lock);
578 work = kmalloc(sizeof(*work), GFP_ATOMIC);
582 INIT_WORK(&work->work, rt6_probe_deferred);
583 work->target = rt->rt6i_gateway;
584 dev_hold(rt->dst.dev);
585 work->dev = rt->dst.dev;
586 schedule_work(&work->work);
590 rcu_read_unlock_bh();
593 static inline void rt6_probe(struct rt6_info *rt)
599 * Default Router Selection (RFC 2461 6.3.6)
601 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
603 struct net_device *dev = rt->dst.dev;
604 if (!oif || dev->ifindex == oif)
606 if ((dev->flags & IFF_LOOPBACK) &&
607 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
612 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
614 struct neighbour *neigh;
615 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
617 if (rt->rt6i_flags & RTF_NONEXTHOP ||
618 !(rt->rt6i_flags & RTF_GATEWAY))
619 return RT6_NUD_SUCCEED;
622 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
624 read_lock(&neigh->lock);
625 if (neigh->nud_state & NUD_VALID)
626 ret = RT6_NUD_SUCCEED;
627 #ifdef CONFIG_IPV6_ROUTER_PREF
628 else if (!(neigh->nud_state & NUD_FAILED))
629 ret = RT6_NUD_SUCCEED;
631 ret = RT6_NUD_FAIL_PROBE;
633 read_unlock(&neigh->lock);
635 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
636 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
638 rcu_read_unlock_bh();
643 static int rt6_score_route(struct rt6_info *rt, int oif,
648 m = rt6_check_dev(rt, oif);
649 if (!m && (strict & RT6_LOOKUP_F_IFACE))
650 return RT6_NUD_FAIL_HARD;
651 #ifdef CONFIG_IPV6_ROUTER_PREF
652 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
654 if (strict & RT6_LOOKUP_F_REACHABLE) {
655 int n = rt6_check_neigh(rt);
662 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
663 int *mpri, struct rt6_info *match,
667 bool match_do_rr = false;
668 struct inet6_dev *idev = rt->rt6i_idev;
669 struct net_device *dev = rt->dst.dev;
671 if (dev && !netif_carrier_ok(dev) &&
672 idev->cnf.ignore_routes_with_linkdown)
675 if (rt6_check_expired(rt))
678 m = rt6_score_route(rt, oif, strict);
679 if (m == RT6_NUD_FAIL_DO_RR) {
681 m = 0; /* lowest valid score */
682 } else if (m == RT6_NUD_FAIL_HARD) {
686 if (strict & RT6_LOOKUP_F_REACHABLE)
689 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
691 *do_rr = match_do_rr;
699 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
700 struct rt6_info *rr_head,
701 u32 metric, int oif, int strict,
704 struct rt6_info *rt, *match, *cont;
709 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
710 if (rt->rt6i_metric != metric) {
715 match = find_match(rt, oif, strict, &mpri, match, do_rr);
718 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
719 if (rt->rt6i_metric != metric) {
724 match = find_match(rt, oif, strict, &mpri, match, do_rr);
730 for (rt = cont; rt; rt = rt->dst.rt6_next)
731 match = find_match(rt, oif, strict, &mpri, match, do_rr);
736 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
738 struct rt6_info *match, *rt0;
744 fn->rr_ptr = rt0 = fn->leaf;
746 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
750 struct rt6_info *next = rt0->dst.rt6_next;
752 /* no entries matched; do round-robin */
753 if (!next || next->rt6i_metric != rt0->rt6i_metric)
760 net = dev_net(rt0->dst.dev);
761 return match ? match : net->ipv6.ip6_null_entry;
764 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
766 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
769 #ifdef CONFIG_IPV6_ROUTE_INFO
770 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
771 const struct in6_addr *gwaddr)
773 struct net *net = dev_net(dev);
774 struct route_info *rinfo = (struct route_info *) opt;
775 struct in6_addr prefix_buf, *prefix;
777 unsigned long lifetime;
780 if (len < sizeof(struct route_info)) {
784 /* Sanity check for prefix_len and length */
785 if (rinfo->length > 3) {
787 } else if (rinfo->prefix_len > 128) {
789 } else if (rinfo->prefix_len > 64) {
790 if (rinfo->length < 2) {
793 } else if (rinfo->prefix_len > 0) {
794 if (rinfo->length < 1) {
799 pref = rinfo->route_pref;
800 if (pref == ICMPV6_ROUTER_PREF_INVALID)
803 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
805 if (rinfo->length == 3)
806 prefix = (struct in6_addr *)rinfo->prefix;
808 /* this function is safe */
809 ipv6_addr_prefix(&prefix_buf,
810 (struct in6_addr *)rinfo->prefix,
812 prefix = &prefix_buf;
815 if (rinfo->prefix_len == 0)
816 rt = rt6_get_dflt_router(gwaddr, dev);
818 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
819 gwaddr, dev->ifindex);
821 if (rt && !lifetime) {
827 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
830 rt->rt6i_flags = RTF_ROUTEINFO |
831 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
834 if (!addrconf_finite_timeout(lifetime))
835 rt6_clean_expires(rt);
837 rt6_set_expires(rt, jiffies + HZ * lifetime);
845 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
846 struct in6_addr *saddr)
848 struct fib6_node *pn;
850 if (fn->fn_flags & RTN_TL_ROOT)
853 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
854 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
857 if (fn->fn_flags & RTN_RTINFO)
862 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
863 struct fib6_table *table,
864 struct flowi6 *fl6, int flags)
866 struct fib6_node *fn;
869 read_lock_bh(&table->tb6_lock);
870 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
873 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
874 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
875 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
876 if (rt == net->ipv6.ip6_null_entry) {
877 fn = fib6_backtrack(fn, &fl6->saddr);
881 dst_use(&rt->dst, jiffies);
882 read_unlock_bh(&table->tb6_lock);
887 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
890 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
892 EXPORT_SYMBOL_GPL(ip6_route_lookup);
894 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
895 const struct in6_addr *saddr, int oif, int strict)
897 struct flowi6 fl6 = {
901 struct dst_entry *dst;
902 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
905 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
906 flags |= RT6_LOOKUP_F_HAS_SADDR;
909 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
911 return (struct rt6_info *) dst;
917 EXPORT_SYMBOL(rt6_lookup);
919 /* ip6_ins_rt is called with FREE table->tb6_lock.
920 It takes new route entry, the addition fails by any reason the
921 route is freed. In any case, if caller does not hold it, it may
925 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
926 struct mx6_config *mxc)
929 struct fib6_table *table;
931 table = rt->rt6i_table;
932 write_lock_bh(&table->tb6_lock);
933 err = fib6_add(&table->tb6_root, rt, info, mxc);
934 write_unlock_bh(&table->tb6_lock);
939 int ip6_ins_rt(struct rt6_info *rt)
941 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
942 struct mx6_config mxc = { .mx = NULL, };
944 return __ip6_ins_rt(rt, &info, &mxc);
947 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
948 const struct in6_addr *daddr,
949 const struct in6_addr *saddr)
957 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
958 ort = (struct rt6_info *)ort->dst.from;
960 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
965 ip6_rt_copy_init(rt, ort);
966 rt->rt6i_flags |= RTF_CACHE;
968 rt->dst.flags |= DST_HOST;
969 rt->rt6i_dst.addr = *daddr;
970 rt->rt6i_dst.plen = 128;
972 if (!rt6_is_gw_or_nonexthop(ort)) {
973 if (ort->rt6i_dst.plen != 128 &&
974 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
975 rt->rt6i_flags |= RTF_ANYCAST;
976 #ifdef CONFIG_IPV6_SUBTREES
977 if (rt->rt6i_src.plen && saddr) {
978 rt->rt6i_src.addr = *saddr;
979 rt->rt6i_src.plen = 128;
987 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
989 struct rt6_info *pcpu_rt;
991 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
992 rt->dst.dev, rt->dst.flags);
996 ip6_rt_copy_init(pcpu_rt, rt);
997 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
998 pcpu_rt->rt6i_flags |= RTF_PCPU;
1002 /* It should be called with read_lock_bh(&tb6_lock) acquired */
1003 static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
1005 struct rt6_info *pcpu_rt, **p;
1007 p = this_cpu_ptr(rt->rt6i_pcpu);
1011 dst_hold(&pcpu_rt->dst);
1012 rt6_dst_from_metrics_check(pcpu_rt);
1017 static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1019 struct fib6_table *table = rt->rt6i_table;
1020 struct rt6_info *pcpu_rt, *prev, **p;
1022 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1024 struct net *net = dev_net(rt->dst.dev);
1026 dst_hold(&net->ipv6.ip6_null_entry->dst);
1027 return net->ipv6.ip6_null_entry;
1030 read_lock_bh(&table->tb6_lock);
1031 if (rt->rt6i_pcpu) {
1032 p = this_cpu_ptr(rt->rt6i_pcpu);
1033 prev = cmpxchg(p, NULL, pcpu_rt);
1035 /* If someone did it before us, return prev instead */
1036 dst_destroy(&pcpu_rt->dst);
1040 /* rt has been removed from the fib6 tree
1041 * before we have a chance to acquire the read_lock.
1042 * In this case, don't brother to create a pcpu rt
1043 * since rt is going away anyway. The next
1044 * dst_check() will trigger a re-lookup.
1046 dst_destroy(&pcpu_rt->dst);
1049 dst_hold(&pcpu_rt->dst);
1050 rt6_dst_from_metrics_check(pcpu_rt);
1051 read_unlock_bh(&table->tb6_lock);
1055 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
1056 struct flowi6 *fl6, int flags)
1058 struct fib6_node *fn, *saved_fn;
1059 struct rt6_info *rt;
1062 strict |= flags & RT6_LOOKUP_F_IFACE;
1063 if (net->ipv6.devconf_all->forwarding == 0)
1064 strict |= RT6_LOOKUP_F_REACHABLE;
1066 read_lock_bh(&table->tb6_lock);
1068 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1072 rt = rt6_select(fn, oif, strict);
1073 if (rt->rt6i_nsiblings)
1074 rt = rt6_multipath_select(rt, fl6, oif, strict);
1075 if (rt == net->ipv6.ip6_null_entry) {
1076 fn = fib6_backtrack(fn, &fl6->saddr);
1078 goto redo_rt6_select;
1079 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1080 /* also consider unreachable route */
1081 strict &= ~RT6_LOOKUP_F_REACHABLE;
1083 goto redo_rt6_select;
1088 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1089 dst_use(&rt->dst, jiffies);
1090 read_unlock_bh(&table->tb6_lock);
1092 rt6_dst_from_metrics_check(rt);
1094 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1095 !(rt->rt6i_flags & RTF_GATEWAY))) {
1096 /* Create a RTF_CACHE clone which will not be
1097 * owned by the fib6 tree. It is for the special case where
1098 * the daddr in the skb during the neighbor look-up is different
1099 * from the fl6->daddr used to look-up route here.
1102 struct rt6_info *uncached_rt;
1104 dst_use(&rt->dst, jiffies);
1105 read_unlock_bh(&table->tb6_lock);
1107 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1108 dst_release(&rt->dst);
1111 rt6_uncached_list_add(uncached_rt);
1113 uncached_rt = net->ipv6.ip6_null_entry;
1115 dst_hold(&uncached_rt->dst);
1119 /* Get a percpu copy */
1121 struct rt6_info *pcpu_rt;
1123 rt->dst.lastuse = jiffies;
1125 pcpu_rt = rt6_get_pcpu_route(rt);
1128 read_unlock_bh(&table->tb6_lock);
1130 /* We have to do the read_unlock first
1131 * because rt6_make_pcpu_route() may trigger
1132 * ip6_dst_gc() which will take the write_lock.
1135 read_unlock_bh(&table->tb6_lock);
1136 pcpu_rt = rt6_make_pcpu_route(rt);
1137 dst_release(&rt->dst);
1145 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1146 struct flowi6 *fl6, int flags)
1148 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1151 static struct dst_entry *ip6_route_input_lookup(struct net *net,
1152 struct net_device *dev,
1153 struct flowi6 *fl6, int flags)
1155 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1156 flags |= RT6_LOOKUP_F_IFACE;
1158 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1161 void ip6_route_input(struct sk_buff *skb)
1163 const struct ipv6hdr *iph = ipv6_hdr(skb);
1164 struct net *net = dev_net(skb->dev);
1165 int flags = RT6_LOOKUP_F_HAS_SADDR;
1166 struct ip_tunnel_info *tun_info;
1167 struct flowi6 fl6 = {
1168 .flowi6_iif = skb->dev->ifindex,
1169 .daddr = iph->daddr,
1170 .saddr = iph->saddr,
1171 .flowlabel = ip6_flowinfo(iph),
1172 .flowi6_mark = skb->mark,
1173 .flowi6_proto = iph->nexthdr,
1176 tun_info = skb_tunnel_info(skb);
1177 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1178 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1180 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1183 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1184 struct flowi6 *fl6, int flags)
1186 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1189 struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
1194 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1196 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1197 flags |= RT6_LOOKUP_F_IFACE;
1199 if (!ipv6_addr_any(&fl6->saddr))
1200 flags |= RT6_LOOKUP_F_HAS_SADDR;
1202 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1204 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1206 EXPORT_SYMBOL(ip6_route_output);
1208 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1210 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1211 struct dst_entry *new = NULL;
1213 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1217 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1220 new->input = dst_discard;
1221 new->output = dst_discard_sk;
1223 if (dst_metrics_read_only(&ort->dst))
1224 new->_metrics = ort->dst._metrics;
1226 dst_copy_metrics(new, &ort->dst);
1227 rt->rt6i_idev = ort->rt6i_idev;
1229 in6_dev_hold(rt->rt6i_idev);
1231 rt->rt6i_gateway = ort->rt6i_gateway;
1232 rt->rt6i_flags = ort->rt6i_flags;
1233 rt->rt6i_metric = 0;
1235 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1236 #ifdef CONFIG_IPV6_SUBTREES
1237 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1243 dst_release(dst_orig);
1244 return new ? new : ERR_PTR(-ENOMEM);
1248 * Destination cache support functions
1251 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1254 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1255 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1258 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1260 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1263 if (rt6_check_expired(rt))
1269 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1271 if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1272 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1278 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1280 struct rt6_info *rt;
1282 rt = (struct rt6_info *) dst;
1284 /* All IPV6 dsts are created with ->obsolete set to the value
1285 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1286 * into this function always.
1289 rt6_dst_from_metrics_check(rt);
1291 if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE))
1292 return rt6_dst_from_check(rt, cookie);
1294 return rt6_check(rt, cookie);
1297 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1299 struct rt6_info *rt = (struct rt6_info *) dst;
1302 if (rt->rt6i_flags & RTF_CACHE) {
1303 if (rt6_check_expired(rt)) {
1315 static void ip6_link_failure(struct sk_buff *skb)
1317 struct rt6_info *rt;
1319 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1321 rt = (struct rt6_info *) skb_dst(skb);
1323 if (rt->rt6i_flags & RTF_CACHE) {
1326 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1327 rt->rt6i_node->fn_sernum = -1;
1332 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1334 struct net *net = dev_net(rt->dst.dev);
1336 rt->rt6i_flags |= RTF_MODIFIED;
1337 rt->rt6i_pmtu = mtu;
1338 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1341 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1342 const struct ipv6hdr *iph, u32 mtu)
1344 struct rt6_info *rt6 = (struct rt6_info *)dst;
1346 if (rt6->rt6i_flags & RTF_LOCAL)
1350 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1351 if (mtu >= dst_mtu(dst))
1354 if (rt6->rt6i_flags & RTF_CACHE) {
1355 rt6_do_update_pmtu(rt6, mtu);
1357 const struct in6_addr *daddr, *saddr;
1358 struct rt6_info *nrt6;
1361 daddr = &iph->daddr;
1362 saddr = &iph->saddr;
1364 daddr = &sk->sk_v6_daddr;
1365 saddr = &inet6_sk(sk)->saddr;
1369 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1371 rt6_do_update_pmtu(nrt6, mtu);
1373 /* ip6_ins_rt(nrt6) will bump the
1374 * rt6->rt6i_node->fn_sernum
1375 * which will fail the next rt6_check() and
1376 * invalidate the sk->sk_dst_cache.
1383 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1384 struct sk_buff *skb, u32 mtu)
1386 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1389 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1392 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1393 struct dst_entry *dst;
1396 memset(&fl6, 0, sizeof(fl6));
1397 fl6.flowi6_oif = oif;
1398 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1399 fl6.daddr = iph->daddr;
1400 fl6.saddr = iph->saddr;
1401 fl6.flowlabel = ip6_flowinfo(iph);
1403 dst = ip6_route_output(net, NULL, &fl6);
1405 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1408 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1410 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1412 ip6_update_pmtu(skb, sock_net(sk), mtu,
1413 sk->sk_bound_dev_if, sk->sk_mark);
1415 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1417 /* Handle redirects */
1418 struct ip6rd_flowi {
1420 struct in6_addr gateway;
1423 static struct rt6_info *__ip6_route_redirect(struct net *net,
1424 struct fib6_table *table,
1428 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1429 struct rt6_info *rt;
1430 struct fib6_node *fn;
1432 /* Get the "current" route for this destination and
1433 * check if the redirect has come from approriate router.
1435 * RFC 4861 specifies that redirects should only be
1436 * accepted if they come from the nexthop to the target.
1437 * Due to the way the routes are chosen, this notion
1438 * is a bit fuzzy and one might need to check all possible
1442 read_lock_bh(&table->tb6_lock);
1443 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1445 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1446 if (rt6_check_expired(rt))
1450 if (!(rt->rt6i_flags & RTF_GATEWAY))
1452 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1454 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1460 rt = net->ipv6.ip6_null_entry;
1461 else if (rt->dst.error) {
1462 rt = net->ipv6.ip6_null_entry;
1466 if (rt == net->ipv6.ip6_null_entry) {
1467 fn = fib6_backtrack(fn, &fl6->saddr);
1475 read_unlock_bh(&table->tb6_lock);
1480 static struct dst_entry *ip6_route_redirect(struct net *net,
1481 const struct flowi6 *fl6,
1482 const struct in6_addr *gateway)
1484 int flags = RT6_LOOKUP_F_HAS_SADDR;
1485 struct ip6rd_flowi rdfl;
1488 rdfl.gateway = *gateway;
1490 return fib6_rule_lookup(net, &rdfl.fl6,
1491 flags, __ip6_route_redirect);
1494 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1496 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1497 struct dst_entry *dst;
1500 memset(&fl6, 0, sizeof(fl6));
1501 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1502 fl6.flowi6_oif = oif;
1503 fl6.flowi6_mark = mark;
1504 fl6.daddr = iph->daddr;
1505 fl6.saddr = iph->saddr;
1506 fl6.flowlabel = ip6_flowinfo(iph);
1508 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1509 rt6_do_redirect(dst, NULL, skb);
1512 EXPORT_SYMBOL_GPL(ip6_redirect);
1514 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1517 const struct ipv6hdr *iph = ipv6_hdr(skb);
1518 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1519 struct dst_entry *dst;
1522 memset(&fl6, 0, sizeof(fl6));
1523 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1524 fl6.flowi6_oif = oif;
1525 fl6.flowi6_mark = mark;
1526 fl6.daddr = msg->dest;
1527 fl6.saddr = iph->daddr;
1529 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1530 rt6_do_redirect(dst, NULL, skb);
1534 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1536 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_FEATURES && (val & ~RTAX_FEATURE_MASK))
1735 __set_bit(type - 1, mxc->mx_valid);
1739 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1740 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1750 int ip6_route_info_create(struct fib6_config *cfg, struct rt6_info **rt_ret)
1753 struct net *net = cfg->fc_nlinfo.nl_net;
1754 struct rt6_info *rt = NULL;
1755 struct net_device *dev = NULL;
1756 struct inet6_dev *idev = NULL;
1757 struct fib6_table *table;
1760 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1762 #ifndef CONFIG_IPV6_SUBTREES
1763 if (cfg->fc_src_len)
1766 if (cfg->fc_ifindex) {
1768 dev = dev_get_by_index(net, cfg->fc_ifindex);
1771 idev = in6_dev_get(dev);
1776 if (cfg->fc_metric == 0)
1777 cfg->fc_metric = IP6_RT_PRIO_USER;
1780 if (cfg->fc_nlinfo.nlh &&
1781 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1782 table = fib6_get_table(net, cfg->fc_table);
1784 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1785 table = fib6_new_table(net, cfg->fc_table);
1788 table = fib6_new_table(net, cfg->fc_table);
1794 rt = ip6_dst_alloc(net, NULL,
1795 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1802 if (cfg->fc_flags & RTF_EXPIRES)
1803 rt6_set_expires(rt, jiffies +
1804 clock_t_to_jiffies(cfg->fc_expires));
1806 rt6_clean_expires(rt);
1808 if (cfg->fc_protocol == RTPROT_UNSPEC)
1809 cfg->fc_protocol = RTPROT_BOOT;
1810 rt->rt6i_protocol = cfg->fc_protocol;
1812 addr_type = ipv6_addr_type(&cfg->fc_dst);
1814 if (addr_type & IPV6_ADDR_MULTICAST)
1815 rt->dst.input = ip6_mc_input;
1816 else if (cfg->fc_flags & RTF_LOCAL)
1817 rt->dst.input = ip6_input;
1819 rt->dst.input = ip6_forward;
1821 rt->dst.output = ip6_output;
1823 if (cfg->fc_encap) {
1824 struct lwtunnel_state *lwtstate;
1826 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1827 cfg->fc_encap, AF_INET6, cfg,
1831 rt->dst.lwtstate = lwtstate_get(lwtstate);
1832 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1833 rt->dst.lwtstate->orig_output = rt->dst.output;
1834 rt->dst.output = lwtunnel_output;
1836 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1837 rt->dst.lwtstate->orig_input = rt->dst.input;
1838 rt->dst.input = lwtunnel_input;
1842 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1843 rt->rt6i_dst.plen = cfg->fc_dst_len;
1844 if (rt->rt6i_dst.plen == 128)
1845 rt->dst.flags |= DST_HOST;
1847 #ifdef CONFIG_IPV6_SUBTREES
1848 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1849 rt->rt6i_src.plen = cfg->fc_src_len;
1852 rt->rt6i_metric = cfg->fc_metric;
1854 /* We cannot add true routes via loopback here,
1855 they would result in kernel looping; promote them to reject routes
1857 if ((cfg->fc_flags & RTF_REJECT) ||
1858 (dev && (dev->flags & IFF_LOOPBACK) &&
1859 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1860 !(cfg->fc_flags & RTF_LOCAL))) {
1861 /* hold loopback dev/idev if we haven't done so. */
1862 if (dev != net->loopback_dev) {
1867 dev = net->loopback_dev;
1869 idev = in6_dev_get(dev);
1875 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1876 switch (cfg->fc_type) {
1878 rt->dst.error = -EINVAL;
1879 rt->dst.output = dst_discard_sk;
1880 rt->dst.input = dst_discard;
1883 rt->dst.error = -EACCES;
1884 rt->dst.output = ip6_pkt_prohibit_out;
1885 rt->dst.input = ip6_pkt_prohibit;
1889 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
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);
1998 int ip6_route_add(struct fib6_config *cfg)
2000 struct mx6_config mxc = { .mx = NULL, };
2001 struct rt6_info *rt = NULL;
2004 err = ip6_route_info_create(cfg, &rt);
2008 err = ip6_convert_metrics(&mxc, cfg);
2012 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2024 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2027 struct fib6_table *table;
2028 struct net *net = dev_net(rt->dst.dev);
2030 if (rt == net->ipv6.ip6_null_entry ||
2031 rt->dst.flags & DST_NOCACHE) {
2036 table = rt->rt6i_table;
2037 write_lock_bh(&table->tb6_lock);
2038 err = fib6_del(rt, info);
2039 write_unlock_bh(&table->tb6_lock);
2046 int ip6_del_rt(struct rt6_info *rt)
2048 struct nl_info info = {
2049 .nl_net = dev_net(rt->dst.dev),
2051 return __ip6_del_rt(rt, &info);
2054 static int ip6_route_del(struct fib6_config *cfg)
2056 struct fib6_table *table;
2057 struct fib6_node *fn;
2058 struct rt6_info *rt;
2061 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2065 read_lock_bh(&table->tb6_lock);
2067 fn = fib6_locate(&table->tb6_root,
2068 &cfg->fc_dst, cfg->fc_dst_len,
2069 &cfg->fc_src, cfg->fc_src_len);
2072 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2073 if ((rt->rt6i_flags & RTF_CACHE) &&
2074 !(cfg->fc_flags & RTF_CACHE))
2076 if (cfg->fc_ifindex &&
2078 rt->dst.dev->ifindex != cfg->fc_ifindex))
2080 if (cfg->fc_flags & RTF_GATEWAY &&
2081 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2083 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2086 read_unlock_bh(&table->tb6_lock);
2088 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2091 read_unlock_bh(&table->tb6_lock);
2096 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2098 struct net *net = dev_net(skb->dev);
2099 struct netevent_redirect netevent;
2100 struct rt6_info *rt, *nrt = NULL;
2101 struct ndisc_options ndopts;
2102 struct inet6_dev *in6_dev;
2103 struct neighbour *neigh;
2105 int optlen, on_link;
2108 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2109 optlen -= sizeof(*msg);
2112 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2116 msg = (struct rd_msg *)icmp6_hdr(skb);
2118 if (ipv6_addr_is_multicast(&msg->dest)) {
2119 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2124 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2126 } else if (ipv6_addr_type(&msg->target) !=
2127 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2128 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2132 in6_dev = __in6_dev_get(skb->dev);
2135 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2139 * The IP source address of the Redirect MUST be the same as the current
2140 * first-hop router for the specified ICMP Destination Address.
2143 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
2144 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2149 if (ndopts.nd_opts_tgt_lladdr) {
2150 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2153 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2158 rt = (struct rt6_info *) dst;
2159 if (rt == net->ipv6.ip6_null_entry) {
2160 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2164 /* Redirect received -> path was valid.
2165 * Look, redirects are sent only in response to data packets,
2166 * so that this nexthop apparently is reachable. --ANK
2168 dst_confirm(&rt->dst);
2170 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2175 * We have finally decided to accept it.
2178 neigh_update(neigh, lladdr, NUD_STALE,
2179 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2180 NEIGH_UPDATE_F_OVERRIDE|
2181 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2182 NEIGH_UPDATE_F_ISROUTER))
2185 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2189 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2191 nrt->rt6i_flags &= ~RTF_GATEWAY;
2193 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2195 if (ip6_ins_rt(nrt))
2198 netevent.old = &rt->dst;
2199 netevent.new = &nrt->dst;
2200 netevent.daddr = &msg->dest;
2201 netevent.neigh = neigh;
2202 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2204 if (rt->rt6i_flags & RTF_CACHE) {
2205 rt = (struct rt6_info *) dst_clone(&rt->dst);
2210 neigh_release(neigh);
2214 * Misc support functions
2217 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2219 BUG_ON(from->dst.from);
2221 rt->rt6i_flags &= ~RTF_EXPIRES;
2222 dst_hold(&from->dst);
2223 rt->dst.from = &from->dst;
2224 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2227 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2229 rt->dst.input = ort->dst.input;
2230 rt->dst.output = ort->dst.output;
2231 rt->rt6i_dst = ort->rt6i_dst;
2232 rt->dst.error = ort->dst.error;
2233 rt->rt6i_idev = ort->rt6i_idev;
2235 in6_dev_hold(rt->rt6i_idev);
2236 rt->dst.lastuse = jiffies;
2237 rt->rt6i_gateway = ort->rt6i_gateway;
2238 rt->rt6i_flags = ort->rt6i_flags;
2239 rt6_set_from(rt, ort);
2240 rt->rt6i_metric = ort->rt6i_metric;
2241 #ifdef CONFIG_IPV6_SUBTREES
2242 rt->rt6i_src = ort->rt6i_src;
2244 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2245 rt->rt6i_table = ort->rt6i_table;
2246 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2249 #ifdef CONFIG_IPV6_ROUTE_INFO
2250 static struct rt6_info *rt6_get_route_info(struct net *net,
2251 const struct in6_addr *prefix, int prefixlen,
2252 const struct in6_addr *gwaddr, int ifindex)
2254 struct fib6_node *fn;
2255 struct rt6_info *rt = NULL;
2256 struct fib6_table *table;
2258 table = fib6_get_table(net, RT6_TABLE_INFO);
2262 read_lock_bh(&table->tb6_lock);
2263 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2267 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2268 if (rt->dst.dev->ifindex != ifindex)
2270 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2272 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2278 read_unlock_bh(&table->tb6_lock);
2282 static struct rt6_info *rt6_add_route_info(struct net *net,
2283 const struct in6_addr *prefix, int prefixlen,
2284 const struct in6_addr *gwaddr, int ifindex,
2287 struct fib6_config cfg = {
2288 .fc_table = RT6_TABLE_INFO,
2289 .fc_metric = IP6_RT_PRIO_USER,
2290 .fc_ifindex = ifindex,
2291 .fc_dst_len = prefixlen,
2292 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2293 RTF_UP | RTF_PREF(pref),
2294 .fc_nlinfo.portid = 0,
2295 .fc_nlinfo.nlh = NULL,
2296 .fc_nlinfo.nl_net = net,
2299 cfg.fc_dst = *prefix;
2300 cfg.fc_gateway = *gwaddr;
2302 /* We should treat it as a default route if prefix length is 0. */
2304 cfg.fc_flags |= RTF_DEFAULT;
2306 ip6_route_add(&cfg);
2308 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
2312 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2314 struct rt6_info *rt;
2315 struct fib6_table *table;
2317 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
2321 read_lock_bh(&table->tb6_lock);
2322 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2323 if (dev == rt->dst.dev &&
2324 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2325 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2330 read_unlock_bh(&table->tb6_lock);
2334 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2335 struct net_device *dev,
2338 struct fib6_config cfg = {
2339 .fc_table = RT6_TABLE_DFLT,
2340 .fc_metric = IP6_RT_PRIO_USER,
2341 .fc_ifindex = dev->ifindex,
2342 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2343 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2344 .fc_nlinfo.portid = 0,
2345 .fc_nlinfo.nlh = NULL,
2346 .fc_nlinfo.nl_net = dev_net(dev),
2349 cfg.fc_gateway = *gwaddr;
2351 ip6_route_add(&cfg);
2353 return rt6_get_dflt_router(gwaddr, dev);
2356 void rt6_purge_dflt_routers(struct net *net)
2358 struct rt6_info *rt;
2359 struct fib6_table *table;
2361 /* NOTE: Keep consistent with rt6_get_dflt_router */
2362 table = fib6_get_table(net, RT6_TABLE_DFLT);
2367 read_lock_bh(&table->tb6_lock);
2368 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2369 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2370 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2372 read_unlock_bh(&table->tb6_lock);
2377 read_unlock_bh(&table->tb6_lock);
2380 static void rtmsg_to_fib6_config(struct net *net,
2381 struct in6_rtmsg *rtmsg,
2382 struct fib6_config *cfg)
2384 memset(cfg, 0, sizeof(*cfg));
2386 cfg->fc_table = RT6_TABLE_MAIN;
2387 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2388 cfg->fc_metric = rtmsg->rtmsg_metric;
2389 cfg->fc_expires = rtmsg->rtmsg_info;
2390 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2391 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2392 cfg->fc_flags = rtmsg->rtmsg_flags;
2394 cfg->fc_nlinfo.nl_net = net;
2396 cfg->fc_dst = rtmsg->rtmsg_dst;
2397 cfg->fc_src = rtmsg->rtmsg_src;
2398 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2401 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2403 struct fib6_config cfg;
2404 struct in6_rtmsg rtmsg;
2408 case SIOCADDRT: /* Add a route */
2409 case SIOCDELRT: /* Delete a route */
2410 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2412 err = copy_from_user(&rtmsg, arg,
2413 sizeof(struct in6_rtmsg));
2417 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2422 err = ip6_route_add(&cfg);
2425 err = ip6_route_del(&cfg);
2439 * Drop the packet on the floor
2442 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2445 struct dst_entry *dst = skb_dst(skb);
2446 switch (ipstats_mib_noroutes) {
2447 case IPSTATS_MIB_INNOROUTES:
2448 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2449 if (type == IPV6_ADDR_ANY) {
2450 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2451 IPSTATS_MIB_INADDRERRORS);
2455 case IPSTATS_MIB_OUTNOROUTES:
2456 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2457 ipstats_mib_noroutes);
2460 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2465 static int ip6_pkt_discard(struct sk_buff *skb)
2467 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2470 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
2472 skb->dev = skb_dst(skb)->dev;
2473 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2476 static int ip6_pkt_prohibit(struct sk_buff *skb)
2478 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2481 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
2483 skb->dev = skb_dst(skb)->dev;
2484 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2488 * Allocate a dst for local (unicast / anycast) address.
2491 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2492 const struct in6_addr *addr,
2495 struct net *net = dev_net(idev->dev);
2496 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2499 return ERR_PTR(-ENOMEM);
2503 rt->dst.flags |= DST_HOST;
2504 rt->dst.input = ip6_input;
2505 rt->dst.output = ip6_output;
2506 rt->rt6i_idev = idev;
2508 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2510 rt->rt6i_flags |= RTF_ANYCAST;
2512 rt->rt6i_flags |= RTF_LOCAL;
2514 rt->rt6i_gateway = *addr;
2515 rt->rt6i_dst.addr = *addr;
2516 rt->rt6i_dst.plen = 128;
2517 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2518 rt->dst.flags |= DST_NOCACHE;
2520 atomic_set(&rt->dst.__refcnt, 1);
2525 int ip6_route_get_saddr(struct net *net,
2526 struct rt6_info *rt,
2527 const struct in6_addr *daddr,
2529 struct in6_addr *saddr)
2531 struct inet6_dev *idev =
2532 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
2534 if (rt && rt->rt6i_prefsrc.plen)
2535 *saddr = rt->rt6i_prefsrc.addr;
2537 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2538 daddr, prefs, saddr);
2542 /* remove deleted ip from prefsrc entries */
2543 struct arg_dev_net_ip {
2544 struct net_device *dev;
2546 struct in6_addr *addr;
2549 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2551 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2552 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2553 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2555 if (((void *)rt->dst.dev == dev || !dev) &&
2556 rt != net->ipv6.ip6_null_entry &&
2557 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2558 /* remove prefsrc entry */
2559 rt->rt6i_prefsrc.plen = 0;
2564 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2566 struct net *net = dev_net(ifp->idev->dev);
2567 struct arg_dev_net_ip adni = {
2568 .dev = ifp->idev->dev,
2572 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2575 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2576 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2578 /* Remove routers and update dst entries when gateway turn into host. */
2579 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2581 struct in6_addr *gateway = (struct in6_addr *)arg;
2583 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2584 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2585 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2591 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2593 fib6_clean_all(net, fib6_clean_tohost, gateway);
2596 struct arg_dev_net {
2597 struct net_device *dev;
2601 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2603 const struct arg_dev_net *adn = arg;
2604 const struct net_device *dev = adn->dev;
2606 if ((rt->dst.dev == dev || !dev) &&
2607 rt != adn->net->ipv6.ip6_null_entry)
2613 void rt6_ifdown(struct net *net, struct net_device *dev)
2615 struct arg_dev_net adn = {
2620 fib6_clean_all(net, fib6_ifdown, &adn);
2621 icmp6_clean_all(fib6_ifdown, &adn);
2622 rt6_uncached_list_flush_dev(net, dev);
2625 struct rt6_mtu_change_arg {
2626 struct net_device *dev;
2630 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2632 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2633 struct inet6_dev *idev;
2635 /* In IPv6 pmtu discovery is not optional,
2636 so that RTAX_MTU lock cannot disable it.
2637 We still use this lock to block changes
2638 caused by addrconf/ndisc.
2641 idev = __in6_dev_get(arg->dev);
2645 /* For administrative MTU increase, there is no way to discover
2646 IPv6 PMTU increase, so PMTU increase should be updated here.
2647 Since RFC 1981 doesn't include administrative MTU increase
2648 update PMTU increase is a MUST. (i.e. jumbo frame)
2651 If new MTU is less than route PMTU, this new MTU will be the
2652 lowest MTU in the path, update the route PMTU to reflect PMTU
2653 decreases; if new MTU is greater than route PMTU, and the
2654 old MTU is the lowest MTU in the path, update the route PMTU
2655 to reflect the increase. In this case if the other nodes' MTU
2656 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2659 if (rt->dst.dev == arg->dev &&
2660 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2661 if (rt->rt6i_flags & RTF_CACHE) {
2662 /* For RTF_CACHE with rt6i_pmtu == 0
2663 * (i.e. a redirected route),
2664 * the metrics of its rt->dst.from has already
2667 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2668 rt->rt6i_pmtu = arg->mtu;
2669 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2670 (dst_mtu(&rt->dst) < arg->mtu &&
2671 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2672 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2678 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2680 struct rt6_mtu_change_arg arg = {
2685 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2688 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2689 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2690 [RTA_OIF] = { .type = NLA_U32 },
2691 [RTA_IIF] = { .type = NLA_U32 },
2692 [RTA_PRIORITY] = { .type = NLA_U32 },
2693 [RTA_METRICS] = { .type = NLA_NESTED },
2694 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2695 [RTA_PREF] = { .type = NLA_U8 },
2696 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2697 [RTA_ENCAP] = { .type = NLA_NESTED },
2700 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2701 struct fib6_config *cfg)
2704 struct nlattr *tb[RTA_MAX+1];
2708 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2713 rtm = nlmsg_data(nlh);
2714 memset(cfg, 0, sizeof(*cfg));
2716 cfg->fc_table = rtm->rtm_table;
2717 cfg->fc_dst_len = rtm->rtm_dst_len;
2718 cfg->fc_src_len = rtm->rtm_src_len;
2719 cfg->fc_flags = RTF_UP;
2720 cfg->fc_protocol = rtm->rtm_protocol;
2721 cfg->fc_type = rtm->rtm_type;
2723 if (rtm->rtm_type == RTN_UNREACHABLE ||
2724 rtm->rtm_type == RTN_BLACKHOLE ||
2725 rtm->rtm_type == RTN_PROHIBIT ||
2726 rtm->rtm_type == RTN_THROW)
2727 cfg->fc_flags |= RTF_REJECT;
2729 if (rtm->rtm_type == RTN_LOCAL)
2730 cfg->fc_flags |= RTF_LOCAL;
2732 if (rtm->rtm_flags & RTM_F_CLONED)
2733 cfg->fc_flags |= RTF_CACHE;
2735 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2736 cfg->fc_nlinfo.nlh = nlh;
2737 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2739 if (tb[RTA_GATEWAY]) {
2740 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2741 cfg->fc_flags |= RTF_GATEWAY;
2745 int plen = (rtm->rtm_dst_len + 7) >> 3;
2747 if (nla_len(tb[RTA_DST]) < plen)
2750 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2754 int plen = (rtm->rtm_src_len + 7) >> 3;
2756 if (nla_len(tb[RTA_SRC]) < plen)
2759 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2762 if (tb[RTA_PREFSRC])
2763 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2766 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2768 if (tb[RTA_PRIORITY])
2769 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2771 if (tb[RTA_METRICS]) {
2772 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2773 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2777 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2779 if (tb[RTA_MULTIPATH]) {
2780 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2781 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2785 pref = nla_get_u8(tb[RTA_PREF]);
2786 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2787 pref != ICMPV6_ROUTER_PREF_HIGH)
2788 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2789 cfg->fc_flags |= RTF_PREF(pref);
2793 cfg->fc_encap = tb[RTA_ENCAP];
2795 if (tb[RTA_ENCAP_TYPE])
2796 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2804 struct rt6_info *rt6_info;
2805 struct fib6_config r_cfg;
2806 struct mx6_config mxc;
2807 struct list_head next;
2810 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2814 list_for_each_entry(nh, rt6_nh_list, next) {
2815 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2816 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2817 nh->r_cfg.fc_ifindex);
2821 static int ip6_route_info_append(struct list_head *rt6_nh_list,
2822 struct rt6_info *rt, struct fib6_config *r_cfg)
2825 struct rt6_info *rtnh;
2828 list_for_each_entry(nh, rt6_nh_list, next) {
2829 /* check if rt6_info already exists */
2830 rtnh = nh->rt6_info;
2832 if (rtnh->dst.dev == rt->dst.dev &&
2833 rtnh->rt6i_idev == rt->rt6i_idev &&
2834 ipv6_addr_equal(&rtnh->rt6i_gateway,
2839 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2843 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2848 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2849 list_add_tail(&nh->next, rt6_nh_list);
2854 static int ip6_route_multipath_add(struct fib6_config *cfg)
2856 struct fib6_config r_cfg;
2857 struct rtnexthop *rtnh;
2858 struct rt6_info *rt;
2859 struct rt6_nh *err_nh;
2860 struct rt6_nh *nh, *nh_safe;
2865 int replace = (cfg->fc_nlinfo.nlh &&
2866 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2867 LIST_HEAD(rt6_nh_list);
2869 remaining = cfg->fc_mp_len;
2870 rtnh = (struct rtnexthop *)cfg->fc_mp;
2872 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2873 * rt6_info structs per nexthop
2875 while (rtnh_ok(rtnh, remaining)) {
2876 memcpy(&r_cfg, cfg, sizeof(*cfg));
2877 if (rtnh->rtnh_ifindex)
2878 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2880 attrlen = rtnh_attrlen(rtnh);
2882 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2884 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2886 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2887 r_cfg.fc_flags |= RTF_GATEWAY;
2889 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2890 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2892 r_cfg.fc_encap_type = nla_get_u16(nla);
2895 err = ip6_route_info_create(&r_cfg, &rt);
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);
3140 goto nla_put_failure;
3142 if (err == -EMSGSIZE)
3143 goto nla_put_failure;
3148 if (nla_put_u32(skb, RTA_IIF, iif))
3149 goto nla_put_failure;
3151 struct in6_addr saddr_buf;
3152 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3153 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3154 goto nla_put_failure;
3157 if (rt->rt6i_prefsrc.plen) {
3158 struct in6_addr saddr_buf;
3159 saddr_buf = rt->rt6i_prefsrc.addr;
3160 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3161 goto nla_put_failure;
3164 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3166 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3167 if (rtnetlink_put_metrics(skb, metrics) < 0)
3168 goto nla_put_failure;
3170 if (rt->rt6i_flags & RTF_GATEWAY) {
3171 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3172 goto nla_put_failure;
3176 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3177 goto nla_put_failure;
3178 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3179 goto nla_put_failure;
3181 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3183 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3184 goto nla_put_failure;
3186 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3187 goto nla_put_failure;
3189 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
3191 nlmsg_end(skb, nlh);
3195 nlmsg_cancel(skb, nlh);
3199 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3201 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3204 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3205 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3206 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3210 return rt6_fill_node(arg->net,
3211 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3212 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3213 prefix, 0, NLM_F_MULTI);
3216 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3218 struct net *net = sock_net(in_skb->sk);
3219 struct nlattr *tb[RTA_MAX+1];
3220 struct rt6_info *rt;
3221 struct sk_buff *skb;
3224 int err, iif = 0, oif = 0;
3226 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3231 memset(&fl6, 0, sizeof(fl6));
3234 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3237 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3241 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3244 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3248 iif = nla_get_u32(tb[RTA_IIF]);
3251 oif = nla_get_u32(tb[RTA_OIF]);
3254 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3257 struct net_device *dev;
3260 dev = __dev_get_by_index(net, iif);
3266 fl6.flowi6_iif = iif;
3268 if (!ipv6_addr_any(&fl6.saddr))
3269 flags |= RT6_LOOKUP_F_HAS_SADDR;
3271 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3274 fl6.flowi6_oif = oif;
3276 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3279 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3286 /* Reserve room for dummy headers, this skb can pass
3287 through good chunk of routing engine.
3289 skb_reset_mac_header(skb);
3290 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3292 skb_dst_set(skb, &rt->dst);
3294 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3295 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3296 nlh->nlmsg_seq, 0, 0, 0);
3302 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3307 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
3309 struct sk_buff *skb;
3310 struct net *net = info->nl_net;
3315 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3317 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3321 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3322 event, info->portid, seq, 0, 0, 0);
3324 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3325 WARN_ON(err == -EMSGSIZE);
3329 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3330 info->nlh, gfp_any());
3334 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3337 static int ip6_route_dev_notify(struct notifier_block *this,
3338 unsigned long event, void *ptr)
3340 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3341 struct net *net = dev_net(dev);
3343 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3344 net->ipv6.ip6_null_entry->dst.dev = dev;
3345 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3346 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3347 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3348 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3349 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3350 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3361 #ifdef CONFIG_PROC_FS
3363 static const struct file_operations ipv6_route_proc_fops = {
3364 .owner = THIS_MODULE,
3365 .open = ipv6_route_open,
3367 .llseek = seq_lseek,
3368 .release = seq_release_net,
3371 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3373 struct net *net = (struct net *)seq->private;
3374 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3375 net->ipv6.rt6_stats->fib_nodes,
3376 net->ipv6.rt6_stats->fib_route_nodes,
3377 net->ipv6.rt6_stats->fib_rt_alloc,
3378 net->ipv6.rt6_stats->fib_rt_entries,
3379 net->ipv6.rt6_stats->fib_rt_cache,
3380 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3381 net->ipv6.rt6_stats->fib_discarded_routes);
3386 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3388 return single_open_net(inode, file, rt6_stats_seq_show);
3391 static const struct file_operations rt6_stats_seq_fops = {
3392 .owner = THIS_MODULE,
3393 .open = rt6_stats_seq_open,
3395 .llseek = seq_lseek,
3396 .release = single_release_net,
3398 #endif /* CONFIG_PROC_FS */
3400 #ifdef CONFIG_SYSCTL
3403 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3404 void __user *buffer, size_t *lenp, loff_t *ppos)
3411 net = (struct net *)ctl->extra1;
3412 delay = net->ipv6.sysctl.flush_delay;
3413 proc_dointvec(ctl, write, buffer, lenp, ppos);
3414 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3418 struct ctl_table ipv6_route_table_template[] = {
3420 .procname = "flush",
3421 .data = &init_net.ipv6.sysctl.flush_delay,
3422 .maxlen = sizeof(int),
3424 .proc_handler = ipv6_sysctl_rtcache_flush
3427 .procname = "gc_thresh",
3428 .data = &ip6_dst_ops_template.gc_thresh,
3429 .maxlen = sizeof(int),
3431 .proc_handler = proc_dointvec,
3434 .procname = "max_size",
3435 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3436 .maxlen = sizeof(int),
3438 .proc_handler = proc_dointvec,
3441 .procname = "gc_min_interval",
3442 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3443 .maxlen = sizeof(int),
3445 .proc_handler = proc_dointvec_jiffies,
3448 .procname = "gc_timeout",
3449 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3450 .maxlen = sizeof(int),
3452 .proc_handler = proc_dointvec_jiffies,
3455 .procname = "gc_interval",
3456 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3457 .maxlen = sizeof(int),
3459 .proc_handler = proc_dointvec_jiffies,
3462 .procname = "gc_elasticity",
3463 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3464 .maxlen = sizeof(int),
3466 .proc_handler = proc_dointvec,
3469 .procname = "mtu_expires",
3470 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3471 .maxlen = sizeof(int),
3473 .proc_handler = proc_dointvec_jiffies,
3476 .procname = "min_adv_mss",
3477 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3478 .maxlen = sizeof(int),
3480 .proc_handler = proc_dointvec,
3483 .procname = "gc_min_interval_ms",
3484 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3485 .maxlen = sizeof(int),
3487 .proc_handler = proc_dointvec_ms_jiffies,
3492 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3494 struct ctl_table *table;
3496 table = kmemdup(ipv6_route_table_template,
3497 sizeof(ipv6_route_table_template),
3501 table[0].data = &net->ipv6.sysctl.flush_delay;
3502 table[0].extra1 = net;
3503 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3504 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3505 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3506 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3507 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3508 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3509 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3510 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3511 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3513 /* Don't export sysctls to unprivileged users */
3514 if (net->user_ns != &init_user_ns)
3515 table[0].procname = NULL;
3522 static int __net_init ip6_route_net_init(struct net *net)
3526 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3527 sizeof(net->ipv6.ip6_dst_ops));
3529 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3530 goto out_ip6_dst_ops;
3532 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3533 sizeof(*net->ipv6.ip6_null_entry),
3535 if (!net->ipv6.ip6_null_entry)
3536 goto out_ip6_dst_entries;
3537 net->ipv6.ip6_null_entry->dst.path =
3538 (struct dst_entry *)net->ipv6.ip6_null_entry;
3539 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3540 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3541 ip6_template_metrics, true);
3543 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3544 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3545 sizeof(*net->ipv6.ip6_prohibit_entry),
3547 if (!net->ipv6.ip6_prohibit_entry)
3548 goto out_ip6_null_entry;
3549 net->ipv6.ip6_prohibit_entry->dst.path =
3550 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3551 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3552 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3553 ip6_template_metrics, true);
3555 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3556 sizeof(*net->ipv6.ip6_blk_hole_entry),
3558 if (!net->ipv6.ip6_blk_hole_entry)
3559 goto out_ip6_prohibit_entry;
3560 net->ipv6.ip6_blk_hole_entry->dst.path =
3561 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3562 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3563 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3564 ip6_template_metrics, true);
3567 net->ipv6.sysctl.flush_delay = 0;
3568 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3569 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3570 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3571 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3572 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3573 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3574 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3576 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3582 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3583 out_ip6_prohibit_entry:
3584 kfree(net->ipv6.ip6_prohibit_entry);
3586 kfree(net->ipv6.ip6_null_entry);
3588 out_ip6_dst_entries:
3589 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3594 static void __net_exit ip6_route_net_exit(struct net *net)
3596 kfree(net->ipv6.ip6_null_entry);
3597 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3598 kfree(net->ipv6.ip6_prohibit_entry);
3599 kfree(net->ipv6.ip6_blk_hole_entry);
3601 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3604 static int __net_init ip6_route_net_init_late(struct net *net)
3606 #ifdef CONFIG_PROC_FS
3607 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3608 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3613 static void __net_exit ip6_route_net_exit_late(struct net *net)
3615 #ifdef CONFIG_PROC_FS
3616 remove_proc_entry("ipv6_route", net->proc_net);
3617 remove_proc_entry("rt6_stats", net->proc_net);
3621 static struct pernet_operations ip6_route_net_ops = {
3622 .init = ip6_route_net_init,
3623 .exit = ip6_route_net_exit,
3626 static int __net_init ipv6_inetpeer_init(struct net *net)
3628 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3632 inet_peer_base_init(bp);
3633 net->ipv6.peers = bp;
3637 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3639 struct inet_peer_base *bp = net->ipv6.peers;
3641 net->ipv6.peers = NULL;
3642 inetpeer_invalidate_tree(bp);
3646 static struct pernet_operations ipv6_inetpeer_ops = {
3647 .init = ipv6_inetpeer_init,
3648 .exit = ipv6_inetpeer_exit,
3651 static struct pernet_operations ip6_route_net_late_ops = {
3652 .init = ip6_route_net_init_late,
3653 .exit = ip6_route_net_exit_late,
3656 static struct notifier_block ip6_route_dev_notifier = {
3657 .notifier_call = ip6_route_dev_notify,
3661 int __init ip6_route_init(void)
3667 ip6_dst_ops_template.kmem_cachep =
3668 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3669 SLAB_HWCACHE_ALIGN, NULL);
3670 if (!ip6_dst_ops_template.kmem_cachep)
3673 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3675 goto out_kmem_cache;
3677 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3679 goto out_dst_entries;
3681 ret = register_pernet_subsys(&ip6_route_net_ops);
3683 goto out_register_inetpeer;
3685 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3687 /* Registering of the loopback is done before this portion of code,
3688 * the loopback reference in rt6_info will not be taken, do it
3689 * manually for init_net */
3690 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3691 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3692 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3693 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3694 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3695 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3696 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3700 goto out_register_subsys;
3706 ret = fib6_rules_init();
3710 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3712 goto fib6_rules_init;
3715 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3716 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3717 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3718 goto out_register_late_subsys;
3720 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3722 goto out_register_late_subsys;
3724 for_each_possible_cpu(cpu) {
3725 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3727 INIT_LIST_HEAD(&ul->head);
3728 spin_lock_init(&ul->lock);
3734 out_register_late_subsys:
3735 unregister_pernet_subsys(&ip6_route_net_late_ops);
3737 fib6_rules_cleanup();
3742 out_register_subsys:
3743 unregister_pernet_subsys(&ip6_route_net_ops);
3744 out_register_inetpeer:
3745 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3747 dst_entries_destroy(&ip6_dst_blackhole_ops);
3749 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3753 void ip6_route_cleanup(void)
3755 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3756 unregister_pernet_subsys(&ip6_route_net_late_ops);
3757 fib6_rules_cleanup();
3760 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3761 unregister_pernet_subsys(&ip6_route_net_ops);
3762 dst_entries_destroy(&ip6_dst_blackhole_ops);
3763 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);