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) {
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_add(struct fib6_config *cfg)
1754 struct net *net = cfg->fc_nlinfo.nl_net;
1755 struct rt6_info *rt = NULL;
1756 struct net_device *dev = NULL;
1757 struct inet6_dev *idev = NULL;
1758 struct fib6_table *table;
1759 struct mx6_config mxc = { .mx = NULL, };
1762 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1764 #ifndef CONFIG_IPV6_SUBTREES
1765 if (cfg->fc_src_len)
1768 if (cfg->fc_ifindex) {
1770 dev = dev_get_by_index(net, cfg->fc_ifindex);
1773 idev = in6_dev_get(dev);
1778 if (cfg->fc_metric == 0)
1779 cfg->fc_metric = IP6_RT_PRIO_USER;
1782 if (cfg->fc_nlinfo.nlh &&
1783 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1784 table = fib6_get_table(net, cfg->fc_table);
1786 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1787 table = fib6_new_table(net, cfg->fc_table);
1790 table = fib6_new_table(net, cfg->fc_table);
1796 rt = ip6_dst_alloc(net, NULL,
1797 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1804 if (cfg->fc_flags & RTF_EXPIRES)
1805 rt6_set_expires(rt, jiffies +
1806 clock_t_to_jiffies(cfg->fc_expires));
1808 rt6_clean_expires(rt);
1810 if (cfg->fc_protocol == RTPROT_UNSPEC)
1811 cfg->fc_protocol = RTPROT_BOOT;
1812 rt->rt6i_protocol = cfg->fc_protocol;
1814 addr_type = ipv6_addr_type(&cfg->fc_dst);
1816 if (addr_type & IPV6_ADDR_MULTICAST)
1817 rt->dst.input = ip6_mc_input;
1818 else if (cfg->fc_flags & RTF_LOCAL)
1819 rt->dst.input = ip6_input;
1821 rt->dst.input = ip6_forward;
1823 rt->dst.output = ip6_output;
1825 if (cfg->fc_encap) {
1826 struct lwtunnel_state *lwtstate;
1828 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1829 cfg->fc_encap, AF_INET6, cfg,
1833 rt->dst.lwtstate = lwtstate_get(lwtstate);
1834 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1835 rt->dst.lwtstate->orig_output = rt->dst.output;
1836 rt->dst.output = lwtunnel_output;
1838 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1839 rt->dst.lwtstate->orig_input = rt->dst.input;
1840 rt->dst.input = lwtunnel_input;
1844 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1845 rt->rt6i_dst.plen = cfg->fc_dst_len;
1846 if (rt->rt6i_dst.plen == 128)
1847 rt->dst.flags |= DST_HOST;
1849 #ifdef CONFIG_IPV6_SUBTREES
1850 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1851 rt->rt6i_src.plen = cfg->fc_src_len;
1854 rt->rt6i_metric = cfg->fc_metric;
1856 /* We cannot add true routes via loopback here,
1857 they would result in kernel looping; promote them to reject routes
1859 if ((cfg->fc_flags & RTF_REJECT) ||
1860 (dev && (dev->flags & IFF_LOOPBACK) &&
1861 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1862 !(cfg->fc_flags & RTF_LOCAL))) {
1863 /* hold loopback dev/idev if we haven't done so. */
1864 if (dev != net->loopback_dev) {
1869 dev = net->loopback_dev;
1871 idev = in6_dev_get(dev);
1877 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1878 switch (cfg->fc_type) {
1880 rt->dst.error = -EINVAL;
1881 rt->dst.output = dst_discard_sk;
1882 rt->dst.input = dst_discard;
1885 rt->dst.error = -EACCES;
1886 rt->dst.output = ip6_pkt_prohibit_out;
1887 rt->dst.input = ip6_pkt_prohibit;
1891 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1893 rt->dst.output = ip6_pkt_discard_out;
1894 rt->dst.input = ip6_pkt_discard;
1900 if (cfg->fc_flags & RTF_GATEWAY) {
1901 const struct in6_addr *gw_addr;
1904 gw_addr = &cfg->fc_gateway;
1905 gwa_type = ipv6_addr_type(gw_addr);
1907 /* if gw_addr is local we will fail to detect this in case
1908 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1909 * will return already-added prefix route via interface that
1910 * prefix route was assigned to, which might be non-loopback.
1913 if (ipv6_chk_addr_and_flags(net, gw_addr,
1914 gwa_type & IPV6_ADDR_LINKLOCAL ?
1918 rt->rt6i_gateway = *gw_addr;
1920 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1921 struct rt6_info *grt;
1923 /* IPv6 strictly inhibits using not link-local
1924 addresses as nexthop address.
1925 Otherwise, router will not able to send redirects.
1926 It is very good, but in some (rare!) circumstances
1927 (SIT, PtP, NBMA NOARP links) it is handy to allow
1928 some exceptions. --ANK
1930 if (!(gwa_type & IPV6_ADDR_UNICAST))
1933 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1935 err = -EHOSTUNREACH;
1939 if (dev != grt->dst.dev) {
1945 idev = grt->rt6i_idev;
1947 in6_dev_hold(grt->rt6i_idev);
1949 if (!(grt->rt6i_flags & RTF_GATEWAY))
1957 if (!dev || (dev->flags & IFF_LOOPBACK))
1965 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1966 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1970 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1971 rt->rt6i_prefsrc.plen = 128;
1973 rt->rt6i_prefsrc.plen = 0;
1975 rt->rt6i_flags = cfg->fc_flags;
1979 rt->rt6i_idev = idev;
1980 rt->rt6i_table = table;
1982 cfg->fc_nlinfo.nl_net = dev_net(dev);
1984 err = ip6_convert_metrics(&mxc, cfg);
1988 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2002 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2005 struct fib6_table *table;
2006 struct net *net = dev_net(rt->dst.dev);
2008 if (rt == net->ipv6.ip6_null_entry) {
2013 table = rt->rt6i_table;
2014 write_lock_bh(&table->tb6_lock);
2015 err = fib6_del(rt, info);
2016 write_unlock_bh(&table->tb6_lock);
2023 int ip6_del_rt(struct rt6_info *rt)
2025 struct nl_info info = {
2026 .nl_net = dev_net(rt->dst.dev),
2028 return __ip6_del_rt(rt, &info);
2031 static int ip6_route_del(struct fib6_config *cfg)
2033 struct fib6_table *table;
2034 struct fib6_node *fn;
2035 struct rt6_info *rt;
2038 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2042 read_lock_bh(&table->tb6_lock);
2044 fn = fib6_locate(&table->tb6_root,
2045 &cfg->fc_dst, cfg->fc_dst_len,
2046 &cfg->fc_src, cfg->fc_src_len);
2049 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2050 if ((rt->rt6i_flags & RTF_CACHE) &&
2051 !(cfg->fc_flags & RTF_CACHE))
2053 if (cfg->fc_ifindex &&
2055 rt->dst.dev->ifindex != cfg->fc_ifindex))
2057 if (cfg->fc_flags & RTF_GATEWAY &&
2058 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2060 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2063 read_unlock_bh(&table->tb6_lock);
2065 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2068 read_unlock_bh(&table->tb6_lock);
2073 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2075 struct net *net = dev_net(skb->dev);
2076 struct netevent_redirect netevent;
2077 struct rt6_info *rt, *nrt = NULL;
2078 struct ndisc_options ndopts;
2079 struct inet6_dev *in6_dev;
2080 struct neighbour *neigh;
2082 int optlen, on_link;
2085 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2086 optlen -= sizeof(*msg);
2089 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2093 msg = (struct rd_msg *)icmp6_hdr(skb);
2095 if (ipv6_addr_is_multicast(&msg->dest)) {
2096 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2101 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2103 } else if (ipv6_addr_type(&msg->target) !=
2104 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2105 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2109 in6_dev = __in6_dev_get(skb->dev);
2112 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2116 * The IP source address of the Redirect MUST be the same as the current
2117 * first-hop router for the specified ICMP Destination Address.
2120 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
2121 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2126 if (ndopts.nd_opts_tgt_lladdr) {
2127 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2130 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2135 rt = (struct rt6_info *) dst;
2136 if (rt == net->ipv6.ip6_null_entry) {
2137 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2141 /* Redirect received -> path was valid.
2142 * Look, redirects are sent only in response to data packets,
2143 * so that this nexthop apparently is reachable. --ANK
2145 dst_confirm(&rt->dst);
2147 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2152 * We have finally decided to accept it.
2155 neigh_update(neigh, lladdr, NUD_STALE,
2156 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2157 NEIGH_UPDATE_F_OVERRIDE|
2158 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2159 NEIGH_UPDATE_F_ISROUTER))
2162 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2166 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2168 nrt->rt6i_flags &= ~RTF_GATEWAY;
2170 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2172 if (ip6_ins_rt(nrt))
2175 netevent.old = &rt->dst;
2176 netevent.new = &nrt->dst;
2177 netevent.daddr = &msg->dest;
2178 netevent.neigh = neigh;
2179 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2181 if (rt->rt6i_flags & RTF_CACHE) {
2182 rt = (struct rt6_info *) dst_clone(&rt->dst);
2187 neigh_release(neigh);
2191 * Misc support functions
2194 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2196 BUG_ON(from->dst.from);
2198 rt->rt6i_flags &= ~RTF_EXPIRES;
2199 dst_hold(&from->dst);
2200 rt->dst.from = &from->dst;
2201 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2204 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2206 rt->dst.input = ort->dst.input;
2207 rt->dst.output = ort->dst.output;
2208 rt->rt6i_dst = ort->rt6i_dst;
2209 rt->dst.error = ort->dst.error;
2210 rt->rt6i_idev = ort->rt6i_idev;
2212 in6_dev_hold(rt->rt6i_idev);
2213 rt->dst.lastuse = jiffies;
2214 rt->rt6i_gateway = ort->rt6i_gateway;
2215 rt->rt6i_flags = ort->rt6i_flags;
2216 rt6_set_from(rt, ort);
2217 rt->rt6i_metric = ort->rt6i_metric;
2218 #ifdef CONFIG_IPV6_SUBTREES
2219 rt->rt6i_src = ort->rt6i_src;
2221 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2222 rt->rt6i_table = ort->rt6i_table;
2223 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2226 #ifdef CONFIG_IPV6_ROUTE_INFO
2227 static struct rt6_info *rt6_get_route_info(struct net *net,
2228 const struct in6_addr *prefix, int prefixlen,
2229 const struct in6_addr *gwaddr, int ifindex)
2231 struct fib6_node *fn;
2232 struct rt6_info *rt = NULL;
2233 struct fib6_table *table;
2235 table = fib6_get_table(net, RT6_TABLE_INFO);
2239 read_lock_bh(&table->tb6_lock);
2240 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2244 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2245 if (rt->dst.dev->ifindex != ifindex)
2247 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2249 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2255 read_unlock_bh(&table->tb6_lock);
2259 static struct rt6_info *rt6_add_route_info(struct net *net,
2260 const struct in6_addr *prefix, int prefixlen,
2261 const struct in6_addr *gwaddr, int ifindex,
2264 struct fib6_config cfg = {
2265 .fc_table = RT6_TABLE_INFO,
2266 .fc_metric = IP6_RT_PRIO_USER,
2267 .fc_ifindex = ifindex,
2268 .fc_dst_len = prefixlen,
2269 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2270 RTF_UP | RTF_PREF(pref),
2271 .fc_nlinfo.portid = 0,
2272 .fc_nlinfo.nlh = NULL,
2273 .fc_nlinfo.nl_net = net,
2276 cfg.fc_dst = *prefix;
2277 cfg.fc_gateway = *gwaddr;
2279 /* We should treat it as a default route if prefix length is 0. */
2281 cfg.fc_flags |= RTF_DEFAULT;
2283 ip6_route_add(&cfg);
2285 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
2289 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2291 struct rt6_info *rt;
2292 struct fib6_table *table;
2294 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
2298 read_lock_bh(&table->tb6_lock);
2299 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2300 if (dev == rt->dst.dev &&
2301 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2302 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2307 read_unlock_bh(&table->tb6_lock);
2311 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2312 struct net_device *dev,
2315 struct fib6_config cfg = {
2316 .fc_table = RT6_TABLE_DFLT,
2317 .fc_metric = IP6_RT_PRIO_USER,
2318 .fc_ifindex = dev->ifindex,
2319 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2320 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2321 .fc_nlinfo.portid = 0,
2322 .fc_nlinfo.nlh = NULL,
2323 .fc_nlinfo.nl_net = dev_net(dev),
2326 cfg.fc_gateway = *gwaddr;
2328 ip6_route_add(&cfg);
2330 return rt6_get_dflt_router(gwaddr, dev);
2333 void rt6_purge_dflt_routers(struct net *net)
2335 struct rt6_info *rt;
2336 struct fib6_table *table;
2338 /* NOTE: Keep consistent with rt6_get_dflt_router */
2339 table = fib6_get_table(net, RT6_TABLE_DFLT);
2344 read_lock_bh(&table->tb6_lock);
2345 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2346 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2347 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2349 read_unlock_bh(&table->tb6_lock);
2354 read_unlock_bh(&table->tb6_lock);
2357 static void rtmsg_to_fib6_config(struct net *net,
2358 struct in6_rtmsg *rtmsg,
2359 struct fib6_config *cfg)
2361 memset(cfg, 0, sizeof(*cfg));
2363 cfg->fc_table = RT6_TABLE_MAIN;
2364 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2365 cfg->fc_metric = rtmsg->rtmsg_metric;
2366 cfg->fc_expires = rtmsg->rtmsg_info;
2367 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2368 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2369 cfg->fc_flags = rtmsg->rtmsg_flags;
2371 cfg->fc_nlinfo.nl_net = net;
2373 cfg->fc_dst = rtmsg->rtmsg_dst;
2374 cfg->fc_src = rtmsg->rtmsg_src;
2375 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2378 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2380 struct fib6_config cfg;
2381 struct in6_rtmsg rtmsg;
2385 case SIOCADDRT: /* Add a route */
2386 case SIOCDELRT: /* Delete a route */
2387 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2389 err = copy_from_user(&rtmsg, arg,
2390 sizeof(struct in6_rtmsg));
2394 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2399 err = ip6_route_add(&cfg);
2402 err = ip6_route_del(&cfg);
2416 * Drop the packet on the floor
2419 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2422 struct dst_entry *dst = skb_dst(skb);
2423 switch (ipstats_mib_noroutes) {
2424 case IPSTATS_MIB_INNOROUTES:
2425 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2426 if (type == IPV6_ADDR_ANY) {
2427 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2428 IPSTATS_MIB_INADDRERRORS);
2432 case IPSTATS_MIB_OUTNOROUTES:
2433 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2434 ipstats_mib_noroutes);
2437 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2442 static int ip6_pkt_discard(struct sk_buff *skb)
2444 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2447 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
2449 skb->dev = skb_dst(skb)->dev;
2450 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2453 static int ip6_pkt_prohibit(struct sk_buff *skb)
2455 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2458 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
2460 skb->dev = skb_dst(skb)->dev;
2461 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2465 * Allocate a dst for local (unicast / anycast) address.
2468 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2469 const struct in6_addr *addr,
2472 struct net *net = dev_net(idev->dev);
2473 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2476 return ERR_PTR(-ENOMEM);
2480 rt->dst.flags |= DST_HOST;
2481 rt->dst.input = ip6_input;
2482 rt->dst.output = ip6_output;
2483 rt->rt6i_idev = idev;
2485 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2487 rt->rt6i_flags |= RTF_ANYCAST;
2489 rt->rt6i_flags |= RTF_LOCAL;
2491 rt->rt6i_gateway = *addr;
2492 rt->rt6i_dst.addr = *addr;
2493 rt->rt6i_dst.plen = 128;
2494 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2496 atomic_set(&rt->dst.__refcnt, 1);
2501 int ip6_route_get_saddr(struct net *net,
2502 struct rt6_info *rt,
2503 const struct in6_addr *daddr,
2505 struct in6_addr *saddr)
2507 struct inet6_dev *idev =
2508 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
2510 if (rt && rt->rt6i_prefsrc.plen)
2511 *saddr = rt->rt6i_prefsrc.addr;
2513 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2514 daddr, prefs, saddr);
2518 /* remove deleted ip from prefsrc entries */
2519 struct arg_dev_net_ip {
2520 struct net_device *dev;
2522 struct in6_addr *addr;
2525 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2527 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2528 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2529 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2531 if (((void *)rt->dst.dev == dev || !dev) &&
2532 rt != net->ipv6.ip6_null_entry &&
2533 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2534 /* remove prefsrc entry */
2535 rt->rt6i_prefsrc.plen = 0;
2540 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2542 struct net *net = dev_net(ifp->idev->dev);
2543 struct arg_dev_net_ip adni = {
2544 .dev = ifp->idev->dev,
2548 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2551 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2552 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2554 /* Remove routers and update dst entries when gateway turn into host. */
2555 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2557 struct in6_addr *gateway = (struct in6_addr *)arg;
2559 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2560 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2561 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2567 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2569 fib6_clean_all(net, fib6_clean_tohost, gateway);
2572 struct arg_dev_net {
2573 struct net_device *dev;
2577 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2579 const struct arg_dev_net *adn = arg;
2580 const struct net_device *dev = adn->dev;
2582 if ((rt->dst.dev == dev || !dev) &&
2583 rt != adn->net->ipv6.ip6_null_entry)
2589 void rt6_ifdown(struct net *net, struct net_device *dev)
2591 struct arg_dev_net adn = {
2596 fib6_clean_all(net, fib6_ifdown, &adn);
2597 icmp6_clean_all(fib6_ifdown, &adn);
2598 rt6_uncached_list_flush_dev(net, dev);
2601 struct rt6_mtu_change_arg {
2602 struct net_device *dev;
2606 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2608 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2609 struct inet6_dev *idev;
2611 /* In IPv6 pmtu discovery is not optional,
2612 so that RTAX_MTU lock cannot disable it.
2613 We still use this lock to block changes
2614 caused by addrconf/ndisc.
2617 idev = __in6_dev_get(arg->dev);
2621 /* For administrative MTU increase, there is no way to discover
2622 IPv6 PMTU increase, so PMTU increase should be updated here.
2623 Since RFC 1981 doesn't include administrative MTU increase
2624 update PMTU increase is a MUST. (i.e. jumbo frame)
2627 If new MTU is less than route PMTU, this new MTU will be the
2628 lowest MTU in the path, update the route PMTU to reflect PMTU
2629 decreases; if new MTU is greater than route PMTU, and the
2630 old MTU is the lowest MTU in the path, update the route PMTU
2631 to reflect the increase. In this case if the other nodes' MTU
2632 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2635 if (rt->dst.dev == arg->dev &&
2636 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2637 if (rt->rt6i_flags & RTF_CACHE) {
2638 /* For RTF_CACHE with rt6i_pmtu == 0
2639 * (i.e. a redirected route),
2640 * the metrics of its rt->dst.from has already
2643 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2644 rt->rt6i_pmtu = arg->mtu;
2645 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2646 (dst_mtu(&rt->dst) < arg->mtu &&
2647 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2648 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2654 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2656 struct rt6_mtu_change_arg arg = {
2661 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2664 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2665 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2666 [RTA_OIF] = { .type = NLA_U32 },
2667 [RTA_IIF] = { .type = NLA_U32 },
2668 [RTA_PRIORITY] = { .type = NLA_U32 },
2669 [RTA_METRICS] = { .type = NLA_NESTED },
2670 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2671 [RTA_PREF] = { .type = NLA_U8 },
2672 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2673 [RTA_ENCAP] = { .type = NLA_NESTED },
2676 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2677 struct fib6_config *cfg)
2680 struct nlattr *tb[RTA_MAX+1];
2684 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2689 rtm = nlmsg_data(nlh);
2690 memset(cfg, 0, sizeof(*cfg));
2692 cfg->fc_table = rtm->rtm_table;
2693 cfg->fc_dst_len = rtm->rtm_dst_len;
2694 cfg->fc_src_len = rtm->rtm_src_len;
2695 cfg->fc_flags = RTF_UP;
2696 cfg->fc_protocol = rtm->rtm_protocol;
2697 cfg->fc_type = rtm->rtm_type;
2699 if (rtm->rtm_type == RTN_UNREACHABLE ||
2700 rtm->rtm_type == RTN_BLACKHOLE ||
2701 rtm->rtm_type == RTN_PROHIBIT ||
2702 rtm->rtm_type == RTN_THROW)
2703 cfg->fc_flags |= RTF_REJECT;
2705 if (rtm->rtm_type == RTN_LOCAL)
2706 cfg->fc_flags |= RTF_LOCAL;
2708 if (rtm->rtm_flags & RTM_F_CLONED)
2709 cfg->fc_flags |= RTF_CACHE;
2711 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2712 cfg->fc_nlinfo.nlh = nlh;
2713 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2715 if (tb[RTA_GATEWAY]) {
2716 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2717 cfg->fc_flags |= RTF_GATEWAY;
2721 int plen = (rtm->rtm_dst_len + 7) >> 3;
2723 if (nla_len(tb[RTA_DST]) < plen)
2726 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2730 int plen = (rtm->rtm_src_len + 7) >> 3;
2732 if (nla_len(tb[RTA_SRC]) < plen)
2735 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2738 if (tb[RTA_PREFSRC])
2739 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2742 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2744 if (tb[RTA_PRIORITY])
2745 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2747 if (tb[RTA_METRICS]) {
2748 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2749 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2753 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2755 if (tb[RTA_MULTIPATH]) {
2756 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2757 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2761 pref = nla_get_u8(tb[RTA_PREF]);
2762 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2763 pref != ICMPV6_ROUTER_PREF_HIGH)
2764 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2765 cfg->fc_flags |= RTF_PREF(pref);
2769 cfg->fc_encap = tb[RTA_ENCAP];
2771 if (tb[RTA_ENCAP_TYPE])
2772 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2779 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2781 struct fib6_config r_cfg;
2782 struct rtnexthop *rtnh;
2785 int err = 0, last_err = 0;
2787 remaining = cfg->fc_mp_len;
2789 rtnh = (struct rtnexthop *)cfg->fc_mp;
2791 /* Parse a Multipath Entry */
2792 while (rtnh_ok(rtnh, remaining)) {
2793 memcpy(&r_cfg, cfg, sizeof(*cfg));
2794 if (rtnh->rtnh_ifindex)
2795 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2797 attrlen = rtnh_attrlen(rtnh);
2799 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2801 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2803 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2804 r_cfg.fc_flags |= RTF_GATEWAY;
2806 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2807 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2809 r_cfg.fc_encap_type = nla_get_u16(nla);
2811 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2814 /* If we are trying to remove a route, do not stop the
2815 * loop when ip6_route_del() fails (because next hop is
2816 * already gone), we should try to remove all next hops.
2819 /* If add fails, we should try to delete all
2820 * next hops that have been already added.
2823 remaining = cfg->fc_mp_len - remaining;
2827 /* Because each route is added like a single route we remove
2828 * these flags after the first nexthop: if there is a collision,
2829 * we have already failed to add the first nexthop:
2830 * fib6_add_rt2node() has rejected it; when replacing, old
2831 * nexthops have been replaced by first new, the rest should
2834 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2836 rtnh = rtnh_next(rtnh, &remaining);
2842 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2844 struct fib6_config cfg;
2847 err = rtm_to_fib6_config(skb, nlh, &cfg);
2852 return ip6_route_multipath(&cfg, 0);
2854 return ip6_route_del(&cfg);
2857 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2859 struct fib6_config cfg;
2862 err = rtm_to_fib6_config(skb, nlh, &cfg);
2867 return ip6_route_multipath(&cfg, 1);
2869 return ip6_route_add(&cfg);
2872 static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
2874 return NLMSG_ALIGN(sizeof(struct rtmsg))
2875 + nla_total_size(16) /* RTA_SRC */
2876 + nla_total_size(16) /* RTA_DST */
2877 + nla_total_size(16) /* RTA_GATEWAY */
2878 + nla_total_size(16) /* RTA_PREFSRC */
2879 + nla_total_size(4) /* RTA_TABLE */
2880 + nla_total_size(4) /* RTA_IIF */
2881 + nla_total_size(4) /* RTA_OIF */
2882 + nla_total_size(4) /* RTA_PRIORITY */
2883 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2884 + nla_total_size(sizeof(struct rta_cacheinfo))
2885 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
2886 + nla_total_size(1) /* RTA_PREF */
2887 + lwtunnel_get_encap_size(rt->dst.lwtstate);
2890 static int rt6_fill_node(struct net *net,
2891 struct sk_buff *skb, struct rt6_info *rt,
2892 struct in6_addr *dst, struct in6_addr *src,
2893 int iif, int type, u32 portid, u32 seq,
2894 int prefix, int nowait, unsigned int flags)
2896 u32 metrics[RTAX_MAX];
2898 struct nlmsghdr *nlh;
2902 if (prefix) { /* user wants prefix routes only */
2903 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2904 /* success since this is not a prefix route */
2909 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2913 rtm = nlmsg_data(nlh);
2914 rtm->rtm_family = AF_INET6;
2915 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2916 rtm->rtm_src_len = rt->rt6i_src.plen;
2919 table = rt->rt6i_table->tb6_id;
2921 table = RT6_TABLE_UNSPEC;
2922 rtm->rtm_table = table;
2923 if (nla_put_u32(skb, RTA_TABLE, table))
2924 goto nla_put_failure;
2925 if (rt->rt6i_flags & RTF_REJECT) {
2926 switch (rt->dst.error) {
2928 rtm->rtm_type = RTN_BLACKHOLE;
2931 rtm->rtm_type = RTN_PROHIBIT;
2934 rtm->rtm_type = RTN_THROW;
2937 rtm->rtm_type = RTN_UNREACHABLE;
2941 else if (rt->rt6i_flags & RTF_LOCAL)
2942 rtm->rtm_type = RTN_LOCAL;
2943 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2944 rtm->rtm_type = RTN_LOCAL;
2946 rtm->rtm_type = RTN_UNICAST;
2948 if (!netif_carrier_ok(rt->dst.dev)) {
2949 rtm->rtm_flags |= RTNH_F_LINKDOWN;
2950 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
2951 rtm->rtm_flags |= RTNH_F_DEAD;
2953 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2954 rtm->rtm_protocol = rt->rt6i_protocol;
2955 if (rt->rt6i_flags & RTF_DYNAMIC)
2956 rtm->rtm_protocol = RTPROT_REDIRECT;
2957 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2958 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2959 rtm->rtm_protocol = RTPROT_RA;
2961 rtm->rtm_protocol = RTPROT_KERNEL;
2964 if (rt->rt6i_flags & RTF_CACHE)
2965 rtm->rtm_flags |= RTM_F_CLONED;
2968 if (nla_put_in6_addr(skb, RTA_DST, dst))
2969 goto nla_put_failure;
2970 rtm->rtm_dst_len = 128;
2971 } else if (rtm->rtm_dst_len)
2972 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
2973 goto nla_put_failure;
2974 #ifdef CONFIG_IPV6_SUBTREES
2976 if (nla_put_in6_addr(skb, RTA_SRC, src))
2977 goto nla_put_failure;
2978 rtm->rtm_src_len = 128;
2979 } else if (rtm->rtm_src_len &&
2980 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
2981 goto nla_put_failure;
2984 #ifdef CONFIG_IPV6_MROUTE
2985 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2986 int err = ip6mr_get_route(net, skb, rtm, nowait);
2991 goto nla_put_failure;
2993 if (err == -EMSGSIZE)
2994 goto nla_put_failure;
2999 if (nla_put_u32(skb, RTA_IIF, iif))
3000 goto nla_put_failure;
3002 struct in6_addr saddr_buf;
3003 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3004 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3005 goto nla_put_failure;
3008 if (rt->rt6i_prefsrc.plen) {
3009 struct in6_addr saddr_buf;
3010 saddr_buf = rt->rt6i_prefsrc.addr;
3011 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3012 goto nla_put_failure;
3015 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3017 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3018 if (rtnetlink_put_metrics(skb, metrics) < 0)
3019 goto nla_put_failure;
3021 if (rt->rt6i_flags & RTF_GATEWAY) {
3022 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3023 goto nla_put_failure;
3027 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3028 goto nla_put_failure;
3029 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3030 goto nla_put_failure;
3032 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3034 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3035 goto nla_put_failure;
3037 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3038 goto nla_put_failure;
3040 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
3042 nlmsg_end(skb, nlh);
3046 nlmsg_cancel(skb, nlh);
3050 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3052 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3055 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3056 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3057 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3061 return rt6_fill_node(arg->net,
3062 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3063 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3064 prefix, 0, NLM_F_MULTI);
3067 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3069 struct net *net = sock_net(in_skb->sk);
3070 struct nlattr *tb[RTA_MAX+1];
3071 struct rt6_info *rt;
3072 struct sk_buff *skb;
3075 int err, iif = 0, oif = 0;
3077 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3082 memset(&fl6, 0, sizeof(fl6));
3085 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3088 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3092 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3095 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3099 iif = nla_get_u32(tb[RTA_IIF]);
3102 oif = nla_get_u32(tb[RTA_OIF]);
3105 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3108 struct net_device *dev;
3111 dev = __dev_get_by_index(net, iif);
3117 fl6.flowi6_iif = iif;
3119 if (!ipv6_addr_any(&fl6.saddr))
3120 flags |= RT6_LOOKUP_F_HAS_SADDR;
3122 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3125 fl6.flowi6_oif = oif;
3127 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3130 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3137 /* Reserve room for dummy headers, this skb can pass
3138 through good chunk of routing engine.
3140 skb_reset_mac_header(skb);
3141 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3143 skb_dst_set(skb, &rt->dst);
3145 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3146 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3147 nlh->nlmsg_seq, 0, 0, 0);
3153 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3158 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
3160 struct sk_buff *skb;
3161 struct net *net = info->nl_net;
3166 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3168 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3172 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3173 event, info->portid, seq, 0, 0, 0);
3175 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3176 WARN_ON(err == -EMSGSIZE);
3180 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3181 info->nlh, gfp_any());
3185 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3188 static int ip6_route_dev_notify(struct notifier_block *this,
3189 unsigned long event, void *ptr)
3191 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3192 struct net *net = dev_net(dev);
3194 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3195 net->ipv6.ip6_null_entry->dst.dev = dev;
3196 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3197 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3198 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3199 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3200 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3201 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3212 #ifdef CONFIG_PROC_FS
3214 static const struct file_operations ipv6_route_proc_fops = {
3215 .owner = THIS_MODULE,
3216 .open = ipv6_route_open,
3218 .llseek = seq_lseek,
3219 .release = seq_release_net,
3222 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3224 struct net *net = (struct net *)seq->private;
3225 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3226 net->ipv6.rt6_stats->fib_nodes,
3227 net->ipv6.rt6_stats->fib_route_nodes,
3228 net->ipv6.rt6_stats->fib_rt_alloc,
3229 net->ipv6.rt6_stats->fib_rt_entries,
3230 net->ipv6.rt6_stats->fib_rt_cache,
3231 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3232 net->ipv6.rt6_stats->fib_discarded_routes);
3237 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3239 return single_open_net(inode, file, rt6_stats_seq_show);
3242 static const struct file_operations rt6_stats_seq_fops = {
3243 .owner = THIS_MODULE,
3244 .open = rt6_stats_seq_open,
3246 .llseek = seq_lseek,
3247 .release = single_release_net,
3249 #endif /* CONFIG_PROC_FS */
3251 #ifdef CONFIG_SYSCTL
3254 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3255 void __user *buffer, size_t *lenp, loff_t *ppos)
3262 net = (struct net *)ctl->extra1;
3263 delay = net->ipv6.sysctl.flush_delay;
3264 proc_dointvec(ctl, write, buffer, lenp, ppos);
3265 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3269 struct ctl_table ipv6_route_table_template[] = {
3271 .procname = "flush",
3272 .data = &init_net.ipv6.sysctl.flush_delay,
3273 .maxlen = sizeof(int),
3275 .proc_handler = ipv6_sysctl_rtcache_flush
3278 .procname = "gc_thresh",
3279 .data = &ip6_dst_ops_template.gc_thresh,
3280 .maxlen = sizeof(int),
3282 .proc_handler = proc_dointvec,
3285 .procname = "max_size",
3286 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3287 .maxlen = sizeof(int),
3289 .proc_handler = proc_dointvec,
3292 .procname = "gc_min_interval",
3293 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3294 .maxlen = sizeof(int),
3296 .proc_handler = proc_dointvec_jiffies,
3299 .procname = "gc_timeout",
3300 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3301 .maxlen = sizeof(int),
3303 .proc_handler = proc_dointvec_jiffies,
3306 .procname = "gc_interval",
3307 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3308 .maxlen = sizeof(int),
3310 .proc_handler = proc_dointvec_jiffies,
3313 .procname = "gc_elasticity",
3314 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3315 .maxlen = sizeof(int),
3317 .proc_handler = proc_dointvec,
3320 .procname = "mtu_expires",
3321 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3322 .maxlen = sizeof(int),
3324 .proc_handler = proc_dointvec_jiffies,
3327 .procname = "min_adv_mss",
3328 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3329 .maxlen = sizeof(int),
3331 .proc_handler = proc_dointvec,
3334 .procname = "gc_min_interval_ms",
3335 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3336 .maxlen = sizeof(int),
3338 .proc_handler = proc_dointvec_ms_jiffies,
3343 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3345 struct ctl_table *table;
3347 table = kmemdup(ipv6_route_table_template,
3348 sizeof(ipv6_route_table_template),
3352 table[0].data = &net->ipv6.sysctl.flush_delay;
3353 table[0].extra1 = net;
3354 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3355 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3356 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3357 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3358 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3359 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3360 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3361 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3362 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3364 /* Don't export sysctls to unprivileged users */
3365 if (net->user_ns != &init_user_ns)
3366 table[0].procname = NULL;
3373 static int __net_init ip6_route_net_init(struct net *net)
3377 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3378 sizeof(net->ipv6.ip6_dst_ops));
3380 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3381 goto out_ip6_dst_ops;
3383 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3384 sizeof(*net->ipv6.ip6_null_entry),
3386 if (!net->ipv6.ip6_null_entry)
3387 goto out_ip6_dst_entries;
3388 net->ipv6.ip6_null_entry->dst.path =
3389 (struct dst_entry *)net->ipv6.ip6_null_entry;
3390 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3391 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3392 ip6_template_metrics, true);
3394 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3395 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3396 sizeof(*net->ipv6.ip6_prohibit_entry),
3398 if (!net->ipv6.ip6_prohibit_entry)
3399 goto out_ip6_null_entry;
3400 net->ipv6.ip6_prohibit_entry->dst.path =
3401 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3402 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3403 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3404 ip6_template_metrics, true);
3406 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3407 sizeof(*net->ipv6.ip6_blk_hole_entry),
3409 if (!net->ipv6.ip6_blk_hole_entry)
3410 goto out_ip6_prohibit_entry;
3411 net->ipv6.ip6_blk_hole_entry->dst.path =
3412 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3413 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3414 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3415 ip6_template_metrics, true);
3418 net->ipv6.sysctl.flush_delay = 0;
3419 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3420 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3421 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3422 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3423 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3424 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3425 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3427 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3433 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3434 out_ip6_prohibit_entry:
3435 kfree(net->ipv6.ip6_prohibit_entry);
3437 kfree(net->ipv6.ip6_null_entry);
3439 out_ip6_dst_entries:
3440 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3445 static void __net_exit ip6_route_net_exit(struct net *net)
3447 kfree(net->ipv6.ip6_null_entry);
3448 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3449 kfree(net->ipv6.ip6_prohibit_entry);
3450 kfree(net->ipv6.ip6_blk_hole_entry);
3452 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3455 static int __net_init ip6_route_net_init_late(struct net *net)
3457 #ifdef CONFIG_PROC_FS
3458 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3459 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3464 static void __net_exit ip6_route_net_exit_late(struct net *net)
3466 #ifdef CONFIG_PROC_FS
3467 remove_proc_entry("ipv6_route", net->proc_net);
3468 remove_proc_entry("rt6_stats", net->proc_net);
3472 static struct pernet_operations ip6_route_net_ops = {
3473 .init = ip6_route_net_init,
3474 .exit = ip6_route_net_exit,
3477 static int __net_init ipv6_inetpeer_init(struct net *net)
3479 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3483 inet_peer_base_init(bp);
3484 net->ipv6.peers = bp;
3488 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3490 struct inet_peer_base *bp = net->ipv6.peers;
3492 net->ipv6.peers = NULL;
3493 inetpeer_invalidate_tree(bp);
3497 static struct pernet_operations ipv6_inetpeer_ops = {
3498 .init = ipv6_inetpeer_init,
3499 .exit = ipv6_inetpeer_exit,
3502 static struct pernet_operations ip6_route_net_late_ops = {
3503 .init = ip6_route_net_init_late,
3504 .exit = ip6_route_net_exit_late,
3507 static struct notifier_block ip6_route_dev_notifier = {
3508 .notifier_call = ip6_route_dev_notify,
3512 int __init ip6_route_init(void)
3518 ip6_dst_ops_template.kmem_cachep =
3519 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3520 SLAB_HWCACHE_ALIGN, NULL);
3521 if (!ip6_dst_ops_template.kmem_cachep)
3524 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3526 goto out_kmem_cache;
3528 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3530 goto out_dst_entries;
3532 ret = register_pernet_subsys(&ip6_route_net_ops);
3534 goto out_register_inetpeer;
3536 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3538 /* Registering of the loopback is done before this portion of code,
3539 * the loopback reference in rt6_info will not be taken, do it
3540 * manually for init_net */
3541 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3542 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3543 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3544 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3545 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3546 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3547 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3551 goto out_register_subsys;
3557 ret = fib6_rules_init();
3561 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3563 goto fib6_rules_init;
3566 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3567 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3568 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3569 goto out_register_late_subsys;
3571 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3573 goto out_register_late_subsys;
3575 for_each_possible_cpu(cpu) {
3576 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3578 INIT_LIST_HEAD(&ul->head);
3579 spin_lock_init(&ul->lock);
3585 out_register_late_subsys:
3586 unregister_pernet_subsys(&ip6_route_net_late_ops);
3588 fib6_rules_cleanup();
3593 out_register_subsys:
3594 unregister_pernet_subsys(&ip6_route_net_ops);
3595 out_register_inetpeer:
3596 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3598 dst_entries_destroy(&ip6_dst_blackhole_ops);
3600 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3604 void ip6_route_cleanup(void)
3606 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3607 unregister_pernet_subsys(&ip6_route_net_late_ops);
3608 fib6_rules_cleanup();
3611 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3612 unregister_pernet_subsys(&ip6_route_net_ops);
3613 dst_entries_destroy(&ip6_dst_blackhole_ops);
3614 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);