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) ||
1198 flags |= RT6_LOOKUP_F_IFACE;
1200 if (!ipv6_addr_any(&fl6->saddr))
1201 flags |= RT6_LOOKUP_F_HAS_SADDR;
1203 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1205 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1207 EXPORT_SYMBOL(ip6_route_output);
1209 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1211 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1212 struct dst_entry *new = NULL;
1214 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1218 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1221 new->input = dst_discard;
1222 new->output = dst_discard_sk;
1224 if (dst_metrics_read_only(&ort->dst))
1225 new->_metrics = ort->dst._metrics;
1227 dst_copy_metrics(new, &ort->dst);
1228 rt->rt6i_idev = ort->rt6i_idev;
1230 in6_dev_hold(rt->rt6i_idev);
1232 rt->rt6i_gateway = ort->rt6i_gateway;
1233 rt->rt6i_flags = ort->rt6i_flags;
1234 rt->rt6i_metric = 0;
1236 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1237 #ifdef CONFIG_IPV6_SUBTREES
1238 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1244 dst_release(dst_orig);
1245 return new ? new : ERR_PTR(-ENOMEM);
1249 * Destination cache support functions
1252 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1255 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1256 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1259 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1261 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1264 if (rt6_check_expired(rt))
1270 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1272 if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1273 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1279 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1281 struct rt6_info *rt;
1283 rt = (struct rt6_info *) dst;
1285 /* All IPV6 dsts are created with ->obsolete set to the value
1286 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1287 * into this function always.
1290 rt6_dst_from_metrics_check(rt);
1292 if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE))
1293 return rt6_dst_from_check(rt, cookie);
1295 return rt6_check(rt, cookie);
1298 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1300 struct rt6_info *rt = (struct rt6_info *) dst;
1303 if (rt->rt6i_flags & RTF_CACHE) {
1304 if (rt6_check_expired(rt)) {
1316 static void ip6_link_failure(struct sk_buff *skb)
1318 struct rt6_info *rt;
1320 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1322 rt = (struct rt6_info *) skb_dst(skb);
1324 if (rt->rt6i_flags & RTF_CACHE) {
1327 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1328 rt->rt6i_node->fn_sernum = -1;
1333 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1335 struct net *net = dev_net(rt->dst.dev);
1337 rt->rt6i_flags |= RTF_MODIFIED;
1338 rt->rt6i_pmtu = mtu;
1339 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1342 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1343 const struct ipv6hdr *iph, u32 mtu)
1345 struct rt6_info *rt6 = (struct rt6_info *)dst;
1347 if (rt6->rt6i_flags & RTF_LOCAL)
1351 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1352 if (mtu >= dst_mtu(dst))
1355 if (rt6->rt6i_flags & RTF_CACHE) {
1356 rt6_do_update_pmtu(rt6, mtu);
1358 const struct in6_addr *daddr, *saddr;
1359 struct rt6_info *nrt6;
1362 daddr = &iph->daddr;
1363 saddr = &iph->saddr;
1365 daddr = &sk->sk_v6_daddr;
1366 saddr = &inet6_sk(sk)->saddr;
1370 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1372 rt6_do_update_pmtu(nrt6, mtu);
1374 /* ip6_ins_rt(nrt6) will bump the
1375 * rt6->rt6i_node->fn_sernum
1376 * which will fail the next rt6_check() and
1377 * invalidate the sk->sk_dst_cache.
1384 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1385 struct sk_buff *skb, u32 mtu)
1387 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1390 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1393 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1394 struct dst_entry *dst;
1397 memset(&fl6, 0, sizeof(fl6));
1398 fl6.flowi6_oif = oif;
1399 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1400 fl6.daddr = iph->daddr;
1401 fl6.saddr = iph->saddr;
1402 fl6.flowlabel = ip6_flowinfo(iph);
1404 dst = ip6_route_output(net, NULL, &fl6);
1406 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1409 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1411 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1413 ip6_update_pmtu(skb, sock_net(sk), mtu,
1414 sk->sk_bound_dev_if, sk->sk_mark);
1416 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1418 /* Handle redirects */
1419 struct ip6rd_flowi {
1421 struct in6_addr gateway;
1424 static struct rt6_info *__ip6_route_redirect(struct net *net,
1425 struct fib6_table *table,
1429 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1430 struct rt6_info *rt;
1431 struct fib6_node *fn;
1433 /* Get the "current" route for this destination and
1434 * check if the redirect has come from approriate router.
1436 * RFC 4861 specifies that redirects should only be
1437 * accepted if they come from the nexthop to the target.
1438 * Due to the way the routes are chosen, this notion
1439 * is a bit fuzzy and one might need to check all possible
1443 read_lock_bh(&table->tb6_lock);
1444 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1446 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1447 if (rt6_check_expired(rt))
1451 if (!(rt->rt6i_flags & RTF_GATEWAY))
1453 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1455 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1461 rt = net->ipv6.ip6_null_entry;
1462 else if (rt->dst.error) {
1463 rt = net->ipv6.ip6_null_entry;
1467 if (rt == net->ipv6.ip6_null_entry) {
1468 fn = fib6_backtrack(fn, &fl6->saddr);
1476 read_unlock_bh(&table->tb6_lock);
1481 static struct dst_entry *ip6_route_redirect(struct net *net,
1482 const struct flowi6 *fl6,
1483 const struct in6_addr *gateway)
1485 int flags = RT6_LOOKUP_F_HAS_SADDR;
1486 struct ip6rd_flowi rdfl;
1489 rdfl.gateway = *gateway;
1491 return fib6_rule_lookup(net, &rdfl.fl6,
1492 flags, __ip6_route_redirect);
1495 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1497 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1498 struct dst_entry *dst;
1501 memset(&fl6, 0, sizeof(fl6));
1502 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1503 fl6.flowi6_oif = oif;
1504 fl6.flowi6_mark = mark;
1505 fl6.daddr = iph->daddr;
1506 fl6.saddr = iph->saddr;
1507 fl6.flowlabel = ip6_flowinfo(iph);
1509 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1510 rt6_do_redirect(dst, NULL, skb);
1513 EXPORT_SYMBOL_GPL(ip6_redirect);
1515 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1518 const struct ipv6hdr *iph = ipv6_hdr(skb);
1519 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1520 struct dst_entry *dst;
1523 memset(&fl6, 0, sizeof(fl6));
1524 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1525 fl6.flowi6_oif = oif;
1526 fl6.flowi6_mark = mark;
1527 fl6.daddr = msg->dest;
1528 fl6.saddr = iph->daddr;
1530 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1531 rt6_do_redirect(dst, NULL, skb);
1535 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1537 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1539 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1541 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1543 struct net_device *dev = dst->dev;
1544 unsigned int mtu = dst_mtu(dst);
1545 struct net *net = dev_net(dev);
1547 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1549 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1550 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1553 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1554 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1555 * IPV6_MAXPLEN is also valid and means: "any MSS,
1556 * rely only on pmtu discovery"
1558 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1563 static unsigned int ip6_mtu(const struct dst_entry *dst)
1565 const struct rt6_info *rt = (const struct rt6_info *)dst;
1566 unsigned int mtu = rt->rt6i_pmtu;
1567 struct inet6_dev *idev;
1572 mtu = dst_metric_raw(dst, RTAX_MTU);
1579 idev = __in6_dev_get(dst->dev);
1581 mtu = idev->cnf.mtu6;
1585 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1588 static struct dst_entry *icmp6_dst_gc_list;
1589 static DEFINE_SPINLOCK(icmp6_dst_lock);
1591 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1594 struct dst_entry *dst;
1595 struct rt6_info *rt;
1596 struct inet6_dev *idev = in6_dev_get(dev);
1597 struct net *net = dev_net(dev);
1599 if (unlikely(!idev))
1600 return ERR_PTR(-ENODEV);
1602 rt = ip6_dst_alloc(net, dev, 0);
1603 if (unlikely(!rt)) {
1605 dst = ERR_PTR(-ENOMEM);
1609 rt->dst.flags |= DST_HOST;
1610 rt->dst.output = ip6_output;
1611 atomic_set(&rt->dst.__refcnt, 1);
1612 rt->rt6i_gateway = fl6->daddr;
1613 rt->rt6i_dst.addr = fl6->daddr;
1614 rt->rt6i_dst.plen = 128;
1615 rt->rt6i_idev = idev;
1616 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1618 spin_lock_bh(&icmp6_dst_lock);
1619 rt->dst.next = icmp6_dst_gc_list;
1620 icmp6_dst_gc_list = &rt->dst;
1621 spin_unlock_bh(&icmp6_dst_lock);
1623 fib6_force_start_gc(net);
1625 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1631 int icmp6_dst_gc(void)
1633 struct dst_entry *dst, **pprev;
1636 spin_lock_bh(&icmp6_dst_lock);
1637 pprev = &icmp6_dst_gc_list;
1639 while ((dst = *pprev) != NULL) {
1640 if (!atomic_read(&dst->__refcnt)) {
1649 spin_unlock_bh(&icmp6_dst_lock);
1654 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1657 struct dst_entry *dst, **pprev;
1659 spin_lock_bh(&icmp6_dst_lock);
1660 pprev = &icmp6_dst_gc_list;
1661 while ((dst = *pprev) != NULL) {
1662 struct rt6_info *rt = (struct rt6_info *) dst;
1663 if (func(rt, arg)) {
1670 spin_unlock_bh(&icmp6_dst_lock);
1673 static int ip6_dst_gc(struct dst_ops *ops)
1675 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1676 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1677 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1678 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1679 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1680 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1683 entries = dst_entries_get_fast(ops);
1684 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1685 entries <= rt_max_size)
1688 net->ipv6.ip6_rt_gc_expire++;
1689 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1690 entries = dst_entries_get_slow(ops);
1691 if (entries < ops->gc_thresh)
1692 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1694 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1695 return entries > rt_max_size;
1698 static int ip6_convert_metrics(struct mx6_config *mxc,
1699 const struct fib6_config *cfg)
1701 bool ecn_ca = false;
1709 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1713 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1714 int type = nla_type(nla);
1719 if (unlikely(type > RTAX_MAX))
1722 if (type == RTAX_CC_ALGO) {
1723 char tmp[TCP_CA_NAME_MAX];
1725 nla_strlcpy(tmp, nla, sizeof(tmp));
1726 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1727 if (val == TCP_CA_UNSPEC)
1730 val = nla_get_u32(nla);
1732 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1736 __set_bit(type - 1, mxc->mx_valid);
1740 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1741 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1751 int ip6_route_info_create(struct fib6_config *cfg, struct rt6_info **rt_ret)
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;
1761 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1763 #ifndef CONFIG_IPV6_SUBTREES
1764 if (cfg->fc_src_len)
1767 if (cfg->fc_ifindex) {
1769 dev = dev_get_by_index(net, cfg->fc_ifindex);
1772 idev = in6_dev_get(dev);
1777 if (cfg->fc_metric == 0)
1778 cfg->fc_metric = IP6_RT_PRIO_USER;
1781 if (cfg->fc_nlinfo.nlh &&
1782 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1783 table = fib6_get_table(net, cfg->fc_table);
1785 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1786 table = fib6_new_table(net, cfg->fc_table);
1789 table = fib6_new_table(net, cfg->fc_table);
1795 rt = ip6_dst_alloc(net, NULL,
1796 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1803 if (cfg->fc_flags & RTF_EXPIRES)
1804 rt6_set_expires(rt, jiffies +
1805 clock_t_to_jiffies(cfg->fc_expires));
1807 rt6_clean_expires(rt);
1809 if (cfg->fc_protocol == RTPROT_UNSPEC)
1810 cfg->fc_protocol = RTPROT_BOOT;
1811 rt->rt6i_protocol = cfg->fc_protocol;
1813 addr_type = ipv6_addr_type(&cfg->fc_dst);
1815 if (addr_type & IPV6_ADDR_MULTICAST)
1816 rt->dst.input = ip6_mc_input;
1817 else if (cfg->fc_flags & RTF_LOCAL)
1818 rt->dst.input = ip6_input;
1820 rt->dst.input = ip6_forward;
1822 rt->dst.output = ip6_output;
1824 if (cfg->fc_encap) {
1825 struct lwtunnel_state *lwtstate;
1827 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1828 cfg->fc_encap, AF_INET6, cfg,
1832 rt->dst.lwtstate = lwtstate_get(lwtstate);
1833 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1834 rt->dst.lwtstate->orig_output = rt->dst.output;
1835 rt->dst.output = lwtunnel_output;
1837 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1838 rt->dst.lwtstate->orig_input = rt->dst.input;
1839 rt->dst.input = lwtunnel_input;
1843 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1844 rt->rt6i_dst.plen = cfg->fc_dst_len;
1845 if (rt->rt6i_dst.plen == 128)
1846 rt->dst.flags |= DST_HOST;
1848 #ifdef CONFIG_IPV6_SUBTREES
1849 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1850 rt->rt6i_src.plen = cfg->fc_src_len;
1853 rt->rt6i_metric = cfg->fc_metric;
1855 /* We cannot add true routes via loopback here,
1856 they would result in kernel looping; promote them to reject routes
1858 if ((cfg->fc_flags & RTF_REJECT) ||
1859 (dev && (dev->flags & IFF_LOOPBACK) &&
1860 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1861 !(cfg->fc_flags & RTF_LOCAL))) {
1862 /* hold loopback dev/idev if we haven't done so. */
1863 if (dev != net->loopback_dev) {
1868 dev = net->loopback_dev;
1870 idev = in6_dev_get(dev);
1876 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1877 switch (cfg->fc_type) {
1879 rt->dst.error = -EINVAL;
1880 rt->dst.output = dst_discard_sk;
1881 rt->dst.input = dst_discard;
1884 rt->dst.error = -EACCES;
1885 rt->dst.output = ip6_pkt_prohibit_out;
1886 rt->dst.input = ip6_pkt_prohibit;
1889 case RTN_UNREACHABLE:
1891 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1892 : (cfg->fc_type == RTN_UNREACHABLE)
1893 ? -EHOSTUNREACH : -ENETUNREACH;
1894 rt->dst.output = ip6_pkt_discard_out;
1895 rt->dst.input = ip6_pkt_discard;
1901 if (cfg->fc_flags & RTF_GATEWAY) {
1902 const struct in6_addr *gw_addr;
1905 gw_addr = &cfg->fc_gateway;
1906 gwa_type = ipv6_addr_type(gw_addr);
1908 /* if gw_addr is local we will fail to detect this in case
1909 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1910 * will return already-added prefix route via interface that
1911 * prefix route was assigned to, which might be non-loopback.
1914 if (ipv6_chk_addr_and_flags(net, gw_addr,
1915 gwa_type & IPV6_ADDR_LINKLOCAL ?
1919 rt->rt6i_gateway = *gw_addr;
1921 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1922 struct rt6_info *grt;
1924 /* IPv6 strictly inhibits using not link-local
1925 addresses as nexthop address.
1926 Otherwise, router will not able to send redirects.
1927 It is very good, but in some (rare!) circumstances
1928 (SIT, PtP, NBMA NOARP links) it is handy to allow
1929 some exceptions. --ANK
1931 if (!(gwa_type & IPV6_ADDR_UNICAST))
1934 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1936 err = -EHOSTUNREACH;
1940 if (dev != grt->dst.dev) {
1946 idev = grt->rt6i_idev;
1948 in6_dev_hold(grt->rt6i_idev);
1950 if (!(grt->rt6i_flags & RTF_GATEWAY))
1958 if (!dev || (dev->flags & IFF_LOOPBACK))
1966 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1967 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1971 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1972 rt->rt6i_prefsrc.plen = 128;
1974 rt->rt6i_prefsrc.plen = 0;
1976 rt->rt6i_flags = cfg->fc_flags;
1980 rt->rt6i_idev = idev;
1981 rt->rt6i_table = table;
1983 cfg->fc_nlinfo.nl_net = dev_net(dev);
2001 int ip6_route_add(struct fib6_config *cfg)
2003 struct mx6_config mxc = { .mx = NULL, };
2004 struct rt6_info *rt = NULL;
2007 err = ip6_route_info_create(cfg, &rt);
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 net *net = dev_net(skb->dev);
2102 struct netevent_redirect netevent;
2103 struct rt6_info *rt, *nrt = NULL;
2104 struct ndisc_options ndopts;
2105 struct inet6_dev *in6_dev;
2106 struct neighbour *neigh;
2108 int optlen, on_link;
2111 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2112 optlen -= sizeof(*msg);
2115 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2119 msg = (struct rd_msg *)icmp6_hdr(skb);
2121 if (ipv6_addr_is_multicast(&msg->dest)) {
2122 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2127 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2129 } else if (ipv6_addr_type(&msg->target) !=
2130 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2131 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2135 in6_dev = __in6_dev_get(skb->dev);
2138 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2142 * The IP source address of the Redirect MUST be the same as the current
2143 * first-hop router for the specified ICMP Destination Address.
2146 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
2147 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2152 if (ndopts.nd_opts_tgt_lladdr) {
2153 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2156 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2161 rt = (struct rt6_info *) dst;
2162 if (rt == net->ipv6.ip6_null_entry) {
2163 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2167 /* Redirect received -> path was valid.
2168 * Look, redirects are sent only in response to data packets,
2169 * so that this nexthop apparently is reachable. --ANK
2171 dst_confirm(&rt->dst);
2173 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2178 * We have finally decided to accept it.
2181 neigh_update(neigh, lladdr, NUD_STALE,
2182 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2183 NEIGH_UPDATE_F_OVERRIDE|
2184 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2185 NEIGH_UPDATE_F_ISROUTER))
2188 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2192 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2194 nrt->rt6i_flags &= ~RTF_GATEWAY;
2196 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2198 if (ip6_ins_rt(nrt))
2201 netevent.old = &rt->dst;
2202 netevent.new = &nrt->dst;
2203 netevent.daddr = &msg->dest;
2204 netevent.neigh = neigh;
2205 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2207 if (rt->rt6i_flags & RTF_CACHE) {
2208 rt = (struct rt6_info *) dst_clone(&rt->dst);
2213 neigh_release(neigh);
2217 * Misc support functions
2220 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2222 BUG_ON(from->dst.from);
2224 rt->rt6i_flags &= ~RTF_EXPIRES;
2225 dst_hold(&from->dst);
2226 rt->dst.from = &from->dst;
2227 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2230 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2232 rt->dst.input = ort->dst.input;
2233 rt->dst.output = ort->dst.output;
2234 rt->rt6i_dst = ort->rt6i_dst;
2235 rt->dst.error = ort->dst.error;
2236 rt->rt6i_idev = ort->rt6i_idev;
2238 in6_dev_hold(rt->rt6i_idev);
2239 rt->dst.lastuse = jiffies;
2240 rt->rt6i_gateway = ort->rt6i_gateway;
2241 rt->rt6i_flags = ort->rt6i_flags;
2242 rt6_set_from(rt, ort);
2243 rt->rt6i_metric = ort->rt6i_metric;
2244 #ifdef CONFIG_IPV6_SUBTREES
2245 rt->rt6i_src = ort->rt6i_src;
2247 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2248 rt->rt6i_table = ort->rt6i_table;
2249 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2252 #ifdef CONFIG_IPV6_ROUTE_INFO
2253 static struct rt6_info *rt6_get_route_info(struct net *net,
2254 const struct in6_addr *prefix, int prefixlen,
2255 const struct in6_addr *gwaddr, int ifindex)
2257 struct fib6_node *fn;
2258 struct rt6_info *rt = NULL;
2259 struct fib6_table *table;
2261 table = fib6_get_table(net, 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 != 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 *net,
2286 const struct in6_addr *prefix, int prefixlen,
2287 const struct in6_addr *gwaddr, int ifindex,
2290 struct fib6_config cfg = {
2291 .fc_table = RT6_TABLE_INFO,
2292 .fc_metric = IP6_RT_PRIO_USER,
2293 .fc_ifindex = ifindex,
2294 .fc_dst_len = prefixlen,
2295 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2296 RTF_UP | RTF_PREF(pref),
2297 .fc_nlinfo.portid = 0,
2298 .fc_nlinfo.nlh = NULL,
2299 .fc_nlinfo.nl_net = net,
2302 cfg.fc_dst = *prefix;
2303 cfg.fc_gateway = *gwaddr;
2305 /* We should treat it as a default route if prefix length is 0. */
2307 cfg.fc_flags |= RTF_DEFAULT;
2309 ip6_route_add(&cfg);
2311 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
2315 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2317 struct rt6_info *rt;
2318 struct fib6_table *table;
2320 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
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 = 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);
2359 void rt6_purge_dflt_routers(struct net *net)
2361 struct rt6_info *rt;
2362 struct fib6_table *table;
2364 /* NOTE: Keep consistent with rt6_get_dflt_router */
2365 table = fib6_get_table(net, RT6_TABLE_DFLT);
2370 read_lock_bh(&table->tb6_lock);
2371 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2372 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2373 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2375 read_unlock_bh(&table->tb6_lock);
2380 read_unlock_bh(&table->tb6_lock);
2383 static void rtmsg_to_fib6_config(struct net *net,
2384 struct in6_rtmsg *rtmsg,
2385 struct fib6_config *cfg)
2387 memset(cfg, 0, sizeof(*cfg));
2389 cfg->fc_table = RT6_TABLE_MAIN;
2390 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2391 cfg->fc_metric = rtmsg->rtmsg_metric;
2392 cfg->fc_expires = rtmsg->rtmsg_info;
2393 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2394 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2395 cfg->fc_flags = rtmsg->rtmsg_flags;
2397 cfg->fc_nlinfo.nl_net = net;
2399 cfg->fc_dst = rtmsg->rtmsg_dst;
2400 cfg->fc_src = rtmsg->rtmsg_src;
2401 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2404 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2406 struct fib6_config cfg;
2407 struct in6_rtmsg rtmsg;
2411 case SIOCADDRT: /* Add a route */
2412 case SIOCDELRT: /* Delete a route */
2413 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2415 err = copy_from_user(&rtmsg, arg,
2416 sizeof(struct in6_rtmsg));
2420 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2425 err = ip6_route_add(&cfg);
2428 err = ip6_route_del(&cfg);
2442 * Drop the packet on the floor
2445 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2448 struct dst_entry *dst = skb_dst(skb);
2449 switch (ipstats_mib_noroutes) {
2450 case IPSTATS_MIB_INNOROUTES:
2451 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2452 if (type == IPV6_ADDR_ANY) {
2453 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2454 IPSTATS_MIB_INADDRERRORS);
2458 case IPSTATS_MIB_OUTNOROUTES:
2459 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2460 ipstats_mib_noroutes);
2463 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2468 static int ip6_pkt_discard(struct sk_buff *skb)
2470 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2473 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
2475 skb->dev = skb_dst(skb)->dev;
2476 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2479 static int ip6_pkt_prohibit(struct sk_buff *skb)
2481 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2484 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
2486 skb->dev = skb_dst(skb)->dev;
2487 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2491 * Allocate a dst for local (unicast / anycast) address.
2494 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2495 const struct in6_addr *addr,
2498 struct net *net = dev_net(idev->dev);
2499 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2502 return ERR_PTR(-ENOMEM);
2506 rt->dst.flags |= DST_HOST;
2507 rt->dst.input = ip6_input;
2508 rt->dst.output = ip6_output;
2509 rt->rt6i_idev = idev;
2511 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2513 rt->rt6i_flags |= RTF_ANYCAST;
2515 rt->rt6i_flags |= RTF_LOCAL;
2517 rt->rt6i_gateway = *addr;
2518 rt->rt6i_dst.addr = *addr;
2519 rt->rt6i_dst.plen = 128;
2520 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2521 rt->dst.flags |= DST_NOCACHE;
2523 atomic_set(&rt->dst.__refcnt, 1);
2528 int ip6_route_get_saddr(struct net *net,
2529 struct rt6_info *rt,
2530 const struct in6_addr *daddr,
2532 struct in6_addr *saddr)
2534 struct inet6_dev *idev =
2535 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
2537 if (rt && rt->rt6i_prefsrc.plen)
2538 *saddr = rt->rt6i_prefsrc.addr;
2540 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2541 daddr, prefs, saddr);
2545 /* remove deleted ip from prefsrc entries */
2546 struct arg_dev_net_ip {
2547 struct net_device *dev;
2549 struct in6_addr *addr;
2552 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2554 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2555 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2556 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2558 if (((void *)rt->dst.dev == dev || !dev) &&
2559 rt != net->ipv6.ip6_null_entry &&
2560 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2561 /* remove prefsrc entry */
2562 rt->rt6i_prefsrc.plen = 0;
2567 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2569 struct net *net = dev_net(ifp->idev->dev);
2570 struct arg_dev_net_ip adni = {
2571 .dev = ifp->idev->dev,
2575 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2578 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2579 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2581 /* Remove routers and update dst entries when gateway turn into host. */
2582 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2584 struct in6_addr *gateway = (struct in6_addr *)arg;
2586 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2587 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2588 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2594 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2596 fib6_clean_all(net, fib6_clean_tohost, gateway);
2599 struct arg_dev_net {
2600 struct net_device *dev;
2604 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2606 const struct arg_dev_net *adn = arg;
2607 const struct net_device *dev = adn->dev;
2609 if ((rt->dst.dev == dev || !dev) &&
2610 rt != adn->net->ipv6.ip6_null_entry)
2616 void rt6_ifdown(struct net *net, struct net_device *dev)
2618 struct arg_dev_net adn = {
2623 fib6_clean_all(net, fib6_ifdown, &adn);
2624 icmp6_clean_all(fib6_ifdown, &adn);
2625 rt6_uncached_list_flush_dev(net, dev);
2628 struct rt6_mtu_change_arg {
2629 struct net_device *dev;
2633 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2635 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2636 struct inet6_dev *idev;
2638 /* In IPv6 pmtu discovery is not optional,
2639 so that RTAX_MTU lock cannot disable it.
2640 We still use this lock to block changes
2641 caused by addrconf/ndisc.
2644 idev = __in6_dev_get(arg->dev);
2648 /* For administrative MTU increase, there is no way to discover
2649 IPv6 PMTU increase, so PMTU increase should be updated here.
2650 Since RFC 1981 doesn't include administrative MTU increase
2651 update PMTU increase is a MUST. (i.e. jumbo frame)
2654 If new MTU is less than route PMTU, this new MTU will be the
2655 lowest MTU in the path, update the route PMTU to reflect PMTU
2656 decreases; if new MTU is greater than route PMTU, and the
2657 old MTU is the lowest MTU in the path, update the route PMTU
2658 to reflect the increase. In this case if the other nodes' MTU
2659 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2662 if (rt->dst.dev == arg->dev &&
2663 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2664 if (rt->rt6i_flags & RTF_CACHE) {
2665 /* For RTF_CACHE with rt6i_pmtu == 0
2666 * (i.e. a redirected route),
2667 * the metrics of its rt->dst.from has already
2670 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2671 rt->rt6i_pmtu = arg->mtu;
2672 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2673 (dst_mtu(&rt->dst) < arg->mtu &&
2674 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2675 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2681 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2683 struct rt6_mtu_change_arg arg = {
2688 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2691 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2692 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2693 [RTA_OIF] = { .type = NLA_U32 },
2694 [RTA_IIF] = { .type = NLA_U32 },
2695 [RTA_PRIORITY] = { .type = NLA_U32 },
2696 [RTA_METRICS] = { .type = NLA_NESTED },
2697 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2698 [RTA_PREF] = { .type = NLA_U8 },
2699 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2700 [RTA_ENCAP] = { .type = NLA_NESTED },
2703 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2704 struct fib6_config *cfg)
2707 struct nlattr *tb[RTA_MAX+1];
2711 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2716 rtm = nlmsg_data(nlh);
2717 memset(cfg, 0, sizeof(*cfg));
2719 cfg->fc_table = rtm->rtm_table;
2720 cfg->fc_dst_len = rtm->rtm_dst_len;
2721 cfg->fc_src_len = rtm->rtm_src_len;
2722 cfg->fc_flags = RTF_UP;
2723 cfg->fc_protocol = rtm->rtm_protocol;
2724 cfg->fc_type = rtm->rtm_type;
2726 if (rtm->rtm_type == RTN_UNREACHABLE ||
2727 rtm->rtm_type == RTN_BLACKHOLE ||
2728 rtm->rtm_type == RTN_PROHIBIT ||
2729 rtm->rtm_type == RTN_THROW)
2730 cfg->fc_flags |= RTF_REJECT;
2732 if (rtm->rtm_type == RTN_LOCAL)
2733 cfg->fc_flags |= RTF_LOCAL;
2735 if (rtm->rtm_flags & RTM_F_CLONED)
2736 cfg->fc_flags |= RTF_CACHE;
2738 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2739 cfg->fc_nlinfo.nlh = nlh;
2740 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2742 if (tb[RTA_GATEWAY]) {
2743 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2744 cfg->fc_flags |= RTF_GATEWAY;
2748 int plen = (rtm->rtm_dst_len + 7) >> 3;
2750 if (nla_len(tb[RTA_DST]) < plen)
2753 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2757 int plen = (rtm->rtm_src_len + 7) >> 3;
2759 if (nla_len(tb[RTA_SRC]) < plen)
2762 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2765 if (tb[RTA_PREFSRC])
2766 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2769 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2771 if (tb[RTA_PRIORITY])
2772 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2774 if (tb[RTA_METRICS]) {
2775 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2776 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2780 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2782 if (tb[RTA_MULTIPATH]) {
2783 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2784 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2788 pref = nla_get_u8(tb[RTA_PREF]);
2789 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2790 pref != ICMPV6_ROUTER_PREF_HIGH)
2791 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2792 cfg->fc_flags |= RTF_PREF(pref);
2796 cfg->fc_encap = tb[RTA_ENCAP];
2798 if (tb[RTA_ENCAP_TYPE])
2799 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2807 struct rt6_info *rt6_info;
2808 struct fib6_config r_cfg;
2809 struct mx6_config mxc;
2810 struct list_head next;
2813 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2817 list_for_each_entry(nh, rt6_nh_list, next) {
2818 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2819 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2820 nh->r_cfg.fc_ifindex);
2824 static int ip6_route_info_append(struct list_head *rt6_nh_list,
2825 struct rt6_info *rt, struct fib6_config *r_cfg)
2828 struct rt6_info *rtnh;
2831 list_for_each_entry(nh, rt6_nh_list, next) {
2832 /* check if rt6_info already exists */
2833 rtnh = nh->rt6_info;
2835 if (rtnh->dst.dev == rt->dst.dev &&
2836 rtnh->rt6i_idev == rt->rt6i_idev &&
2837 ipv6_addr_equal(&rtnh->rt6i_gateway,
2842 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2846 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2851 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2852 list_add_tail(&nh->next, rt6_nh_list);
2857 static int ip6_route_multipath_add(struct fib6_config *cfg)
2859 struct fib6_config r_cfg;
2860 struct rtnexthop *rtnh;
2861 struct rt6_info *rt;
2862 struct rt6_nh *err_nh;
2863 struct rt6_nh *nh, *nh_safe;
2868 int replace = (cfg->fc_nlinfo.nlh &&
2869 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2870 LIST_HEAD(rt6_nh_list);
2872 remaining = cfg->fc_mp_len;
2873 rtnh = (struct rtnexthop *)cfg->fc_mp;
2875 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2876 * rt6_info structs per nexthop
2878 while (rtnh_ok(rtnh, remaining)) {
2879 memcpy(&r_cfg, cfg, sizeof(*cfg));
2880 if (rtnh->rtnh_ifindex)
2881 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2883 attrlen = rtnh_attrlen(rtnh);
2885 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2887 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2889 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2890 r_cfg.fc_flags |= RTF_GATEWAY;
2892 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2893 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2895 r_cfg.fc_encap_type = nla_get_u16(nla);
2898 err = ip6_route_info_create(&r_cfg, &rt);
2902 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
2908 rtnh = rtnh_next(rtnh, &remaining);
2912 list_for_each_entry(nh, &rt6_nh_list, next) {
2913 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2914 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2915 nh->rt6_info = NULL;
2918 ip6_print_replace_route_err(&rt6_nh_list);
2923 /* Because each route is added like a single route we remove
2924 * these flags after the first nexthop: if there is a collision,
2925 * we have already failed to add the first nexthop:
2926 * fib6_add_rt2node() has rejected it; when replacing, old
2927 * nexthops have been replaced by first new, the rest should
2930 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2938 /* Delete routes that were already added */
2939 list_for_each_entry(nh, &rt6_nh_list, next) {
2942 ip6_route_del(&nh->r_cfg);
2946 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
2948 dst_free(&nh->rt6_info->dst);
2950 list_del(&nh->next);
2957 static int ip6_route_multipath_del(struct fib6_config *cfg)
2959 struct fib6_config r_cfg;
2960 struct rtnexthop *rtnh;
2963 int err = 1, last_err = 0;
2965 remaining = cfg->fc_mp_len;
2966 rtnh = (struct rtnexthop *)cfg->fc_mp;
2968 /* Parse a Multipath Entry */
2969 while (rtnh_ok(rtnh, remaining)) {
2970 memcpy(&r_cfg, cfg, sizeof(*cfg));
2971 if (rtnh->rtnh_ifindex)
2972 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2974 attrlen = rtnh_attrlen(rtnh);
2976 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2978 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2980 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2981 r_cfg.fc_flags |= RTF_GATEWAY;
2984 err = ip6_route_del(&r_cfg);
2988 rtnh = rtnh_next(rtnh, &remaining);
2994 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2996 struct fib6_config cfg;
2999 err = rtm_to_fib6_config(skb, nlh, &cfg);
3004 return ip6_route_multipath_del(&cfg);
3006 return ip6_route_del(&cfg);
3009 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3011 struct fib6_config cfg;
3014 err = rtm_to_fib6_config(skb, nlh, &cfg);
3019 return ip6_route_multipath_add(&cfg);
3021 return ip6_route_add(&cfg);
3024 static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
3026 return NLMSG_ALIGN(sizeof(struct rtmsg))
3027 + nla_total_size(16) /* RTA_SRC */
3028 + nla_total_size(16) /* RTA_DST */
3029 + nla_total_size(16) /* RTA_GATEWAY */
3030 + nla_total_size(16) /* RTA_PREFSRC */
3031 + nla_total_size(4) /* RTA_TABLE */
3032 + nla_total_size(4) /* RTA_IIF */
3033 + nla_total_size(4) /* RTA_OIF */
3034 + nla_total_size(4) /* RTA_PRIORITY */
3035 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3036 + nla_total_size(sizeof(struct rta_cacheinfo))
3037 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3038 + nla_total_size(1) /* RTA_PREF */
3039 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3042 static int rt6_fill_node(struct net *net,
3043 struct sk_buff *skb, struct rt6_info *rt,
3044 struct in6_addr *dst, struct in6_addr *src,
3045 int iif, int type, u32 portid, u32 seq,
3046 int prefix, int nowait, unsigned int flags)
3048 u32 metrics[RTAX_MAX];
3050 struct nlmsghdr *nlh;
3054 if (prefix) { /* user wants prefix routes only */
3055 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3056 /* success since this is not a prefix route */
3061 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3065 rtm = nlmsg_data(nlh);
3066 rtm->rtm_family = AF_INET6;
3067 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3068 rtm->rtm_src_len = rt->rt6i_src.plen;
3071 table = rt->rt6i_table->tb6_id;
3073 table = RT6_TABLE_UNSPEC;
3074 rtm->rtm_table = table;
3075 if (nla_put_u32(skb, RTA_TABLE, table))
3076 goto nla_put_failure;
3077 if (rt->rt6i_flags & RTF_REJECT) {
3078 switch (rt->dst.error) {
3080 rtm->rtm_type = RTN_BLACKHOLE;
3083 rtm->rtm_type = RTN_PROHIBIT;
3086 rtm->rtm_type = RTN_THROW;
3089 rtm->rtm_type = RTN_UNREACHABLE;
3093 else if (rt->rt6i_flags & RTF_LOCAL)
3094 rtm->rtm_type = RTN_LOCAL;
3095 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3096 rtm->rtm_type = RTN_LOCAL;
3098 rtm->rtm_type = RTN_UNICAST;
3100 if (!netif_carrier_ok(rt->dst.dev)) {
3101 rtm->rtm_flags |= RTNH_F_LINKDOWN;
3102 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3103 rtm->rtm_flags |= RTNH_F_DEAD;
3105 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3106 rtm->rtm_protocol = rt->rt6i_protocol;
3107 if (rt->rt6i_flags & RTF_DYNAMIC)
3108 rtm->rtm_protocol = RTPROT_REDIRECT;
3109 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3110 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3111 rtm->rtm_protocol = RTPROT_RA;
3113 rtm->rtm_protocol = RTPROT_KERNEL;
3116 if (rt->rt6i_flags & RTF_CACHE)
3117 rtm->rtm_flags |= RTM_F_CLONED;
3120 if (nla_put_in6_addr(skb, RTA_DST, dst))
3121 goto nla_put_failure;
3122 rtm->rtm_dst_len = 128;
3123 } else if (rtm->rtm_dst_len)
3124 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3125 goto nla_put_failure;
3126 #ifdef CONFIG_IPV6_SUBTREES
3128 if (nla_put_in6_addr(skb, RTA_SRC, src))
3129 goto nla_put_failure;
3130 rtm->rtm_src_len = 128;
3131 } else if (rtm->rtm_src_len &&
3132 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3133 goto nla_put_failure;
3136 #ifdef CONFIG_IPV6_MROUTE
3137 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3138 int err = ip6mr_get_route(net, skb, rtm, nowait);
3143 goto nla_put_failure;
3145 if (err == -EMSGSIZE)
3146 goto nla_put_failure;
3151 if (nla_put_u32(skb, RTA_IIF, iif))
3152 goto nla_put_failure;
3154 struct in6_addr saddr_buf;
3155 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3156 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3157 goto nla_put_failure;
3160 if (rt->rt6i_prefsrc.plen) {
3161 struct in6_addr saddr_buf;
3162 saddr_buf = rt->rt6i_prefsrc.addr;
3163 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3164 goto nla_put_failure;
3167 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3169 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3170 if (rtnetlink_put_metrics(skb, metrics) < 0)
3171 goto nla_put_failure;
3173 if (rt->rt6i_flags & RTF_GATEWAY) {
3174 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3175 goto nla_put_failure;
3179 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3180 goto nla_put_failure;
3181 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3182 goto nla_put_failure;
3184 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3186 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3187 goto nla_put_failure;
3189 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3190 goto nla_put_failure;
3192 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
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 struct net_device *dev;
3263 dev = __dev_get_by_index(net, iif);
3269 fl6.flowi6_iif = iif;
3271 if (!ipv6_addr_any(&fl6.saddr))
3272 flags |= RT6_LOOKUP_F_HAS_SADDR;
3274 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3277 fl6.flowi6_oif = oif;
3279 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3282 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3289 /* Reserve room for dummy headers, this skb can pass
3290 through good chunk of routing engine.
3292 skb_reset_mac_header(skb);
3293 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3295 skb_dst_set(skb, &rt->dst);
3297 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3298 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3299 nlh->nlmsg_seq, 0, 0, 0);
3305 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3310 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3311 unsigned int nlm_flags)
3313 struct sk_buff *skb;
3314 struct net *net = info->nl_net;
3319 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3321 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3325 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3326 event, info->portid, seq, 0, 0, nlm_flags);
3328 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3329 WARN_ON(err == -EMSGSIZE);
3333 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3334 info->nlh, gfp_any());
3338 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3341 static int ip6_route_dev_notify(struct notifier_block *this,
3342 unsigned long event, void *ptr)
3344 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3345 struct net *net = dev_net(dev);
3347 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3348 net->ipv6.ip6_null_entry->dst.dev = dev;
3349 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3350 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3351 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3352 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3353 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3354 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3365 #ifdef CONFIG_PROC_FS
3367 static const struct file_operations ipv6_route_proc_fops = {
3368 .owner = THIS_MODULE,
3369 .open = ipv6_route_open,
3371 .llseek = seq_lseek,
3372 .release = seq_release_net,
3375 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3377 struct net *net = (struct net *)seq->private;
3378 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3379 net->ipv6.rt6_stats->fib_nodes,
3380 net->ipv6.rt6_stats->fib_route_nodes,
3381 net->ipv6.rt6_stats->fib_rt_alloc,
3382 net->ipv6.rt6_stats->fib_rt_entries,
3383 net->ipv6.rt6_stats->fib_rt_cache,
3384 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3385 net->ipv6.rt6_stats->fib_discarded_routes);
3390 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3392 return single_open_net(inode, file, rt6_stats_seq_show);
3395 static const struct file_operations rt6_stats_seq_fops = {
3396 .owner = THIS_MODULE,
3397 .open = rt6_stats_seq_open,
3399 .llseek = seq_lseek,
3400 .release = single_release_net,
3402 #endif /* CONFIG_PROC_FS */
3404 #ifdef CONFIG_SYSCTL
3407 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3408 void __user *buffer, size_t *lenp, loff_t *ppos)
3415 net = (struct net *)ctl->extra1;
3416 delay = net->ipv6.sysctl.flush_delay;
3417 proc_dointvec(ctl, write, buffer, lenp, ppos);
3418 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3422 struct ctl_table ipv6_route_table_template[] = {
3424 .procname = "flush",
3425 .data = &init_net.ipv6.sysctl.flush_delay,
3426 .maxlen = sizeof(int),
3428 .proc_handler = ipv6_sysctl_rtcache_flush
3431 .procname = "gc_thresh",
3432 .data = &ip6_dst_ops_template.gc_thresh,
3433 .maxlen = sizeof(int),
3435 .proc_handler = proc_dointvec,
3438 .procname = "max_size",
3439 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3440 .maxlen = sizeof(int),
3442 .proc_handler = proc_dointvec,
3445 .procname = "gc_min_interval",
3446 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3447 .maxlen = sizeof(int),
3449 .proc_handler = proc_dointvec_jiffies,
3452 .procname = "gc_timeout",
3453 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3454 .maxlen = sizeof(int),
3456 .proc_handler = proc_dointvec_jiffies,
3459 .procname = "gc_interval",
3460 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3461 .maxlen = sizeof(int),
3463 .proc_handler = proc_dointvec_jiffies,
3466 .procname = "gc_elasticity",
3467 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3468 .maxlen = sizeof(int),
3470 .proc_handler = proc_dointvec,
3473 .procname = "mtu_expires",
3474 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3475 .maxlen = sizeof(int),
3477 .proc_handler = proc_dointvec_jiffies,
3480 .procname = "min_adv_mss",
3481 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3482 .maxlen = sizeof(int),
3484 .proc_handler = proc_dointvec,
3487 .procname = "gc_min_interval_ms",
3488 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3489 .maxlen = sizeof(int),
3491 .proc_handler = proc_dointvec_ms_jiffies,
3496 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3498 struct ctl_table *table;
3500 table = kmemdup(ipv6_route_table_template,
3501 sizeof(ipv6_route_table_template),
3505 table[0].data = &net->ipv6.sysctl.flush_delay;
3506 table[0].extra1 = net;
3507 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3508 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3509 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3510 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3511 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3512 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3513 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3514 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3515 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3517 /* Don't export sysctls to unprivileged users */
3518 if (net->user_ns != &init_user_ns)
3519 table[0].procname = NULL;
3526 static int __net_init ip6_route_net_init(struct net *net)
3530 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3531 sizeof(net->ipv6.ip6_dst_ops));
3533 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3534 goto out_ip6_dst_ops;
3536 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3537 sizeof(*net->ipv6.ip6_null_entry),
3539 if (!net->ipv6.ip6_null_entry)
3540 goto out_ip6_dst_entries;
3541 net->ipv6.ip6_null_entry->dst.path =
3542 (struct dst_entry *)net->ipv6.ip6_null_entry;
3543 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3544 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3545 ip6_template_metrics, true);
3547 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3548 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3549 sizeof(*net->ipv6.ip6_prohibit_entry),
3551 if (!net->ipv6.ip6_prohibit_entry)
3552 goto out_ip6_null_entry;
3553 net->ipv6.ip6_prohibit_entry->dst.path =
3554 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3555 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3556 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3557 ip6_template_metrics, true);
3559 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3560 sizeof(*net->ipv6.ip6_blk_hole_entry),
3562 if (!net->ipv6.ip6_blk_hole_entry)
3563 goto out_ip6_prohibit_entry;
3564 net->ipv6.ip6_blk_hole_entry->dst.path =
3565 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3566 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3567 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3568 ip6_template_metrics, true);
3571 net->ipv6.sysctl.flush_delay = 0;
3572 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3573 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3574 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3575 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3576 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3577 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3578 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3580 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3586 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3587 out_ip6_prohibit_entry:
3588 kfree(net->ipv6.ip6_prohibit_entry);
3590 kfree(net->ipv6.ip6_null_entry);
3592 out_ip6_dst_entries:
3593 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3598 static void __net_exit ip6_route_net_exit(struct net *net)
3600 kfree(net->ipv6.ip6_null_entry);
3601 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3602 kfree(net->ipv6.ip6_prohibit_entry);
3603 kfree(net->ipv6.ip6_blk_hole_entry);
3605 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3608 static int __net_init ip6_route_net_init_late(struct net *net)
3610 #ifdef CONFIG_PROC_FS
3611 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3612 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3617 static void __net_exit ip6_route_net_exit_late(struct net *net)
3619 #ifdef CONFIG_PROC_FS
3620 remove_proc_entry("ipv6_route", net->proc_net);
3621 remove_proc_entry("rt6_stats", net->proc_net);
3625 static struct pernet_operations ip6_route_net_ops = {
3626 .init = ip6_route_net_init,
3627 .exit = ip6_route_net_exit,
3630 static int __net_init ipv6_inetpeer_init(struct net *net)
3632 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3636 inet_peer_base_init(bp);
3637 net->ipv6.peers = bp;
3641 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3643 struct inet_peer_base *bp = net->ipv6.peers;
3645 net->ipv6.peers = NULL;
3646 inetpeer_invalidate_tree(bp);
3650 static struct pernet_operations ipv6_inetpeer_ops = {
3651 .init = ipv6_inetpeer_init,
3652 .exit = ipv6_inetpeer_exit,
3655 static struct pernet_operations ip6_route_net_late_ops = {
3656 .init = ip6_route_net_init_late,
3657 .exit = ip6_route_net_exit_late,
3660 static struct notifier_block ip6_route_dev_notifier = {
3661 .notifier_call = ip6_route_dev_notify,
3665 int __init ip6_route_init(void)
3671 ip6_dst_ops_template.kmem_cachep =
3672 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3673 SLAB_HWCACHE_ALIGN, NULL);
3674 if (!ip6_dst_ops_template.kmem_cachep)
3677 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3679 goto out_kmem_cache;
3681 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3683 goto out_dst_entries;
3685 ret = register_pernet_subsys(&ip6_route_net_ops);
3687 goto out_register_inetpeer;
3689 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3691 /* Registering of the loopback is done before this portion of code,
3692 * the loopback reference in rt6_info will not be taken, do it
3693 * manually for init_net */
3694 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3695 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3696 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3697 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3698 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3699 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3700 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3704 goto out_register_subsys;
3710 ret = fib6_rules_init();
3714 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3716 goto fib6_rules_init;
3719 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3720 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3721 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3722 goto out_register_late_subsys;
3724 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3726 goto out_register_late_subsys;
3728 for_each_possible_cpu(cpu) {
3729 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3731 INIT_LIST_HEAD(&ul->head);
3732 spin_lock_init(&ul->lock);
3738 out_register_late_subsys:
3739 unregister_pernet_subsys(&ip6_route_net_late_ops);
3741 fib6_rules_cleanup();
3746 out_register_subsys:
3747 unregister_pernet_subsys(&ip6_route_net_ops);
3748 out_register_inetpeer:
3749 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3751 dst_entries_destroy(&ip6_dst_blackhole_ops);
3753 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3757 void ip6_route_cleanup(void)
3759 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3760 unregister_pernet_subsys(&ip6_route_net_late_ops);
3761 fib6_rules_cleanup();
3764 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3765 unregister_pernet_subsys(&ip6_route_net_ops);
3766 dst_entries_destroy(&ip6_dst_blackhole_ops);
3767 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);