2 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
18 * YOSHIFUJI Hideaki @USAGI
19 * reworked default router selection.
20 * - respect outgoing interface
21 * - select from (probably) reachable routers (i.e.
22 * routers in REACHABLE, STALE, DELAY or PROBE states).
23 * - always select the same router if it is (probably)
24 * reachable. otherwise, round-robin the list.
26 * Fixed routing subtrees.
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/times.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/net.h>
36 #include <linux/route.h>
37 #include <linux/netdevice.h>
38 #include <linux/in6.h>
39 #include <linux/init.h>
40 #include <linux/if_arp.h>
41 #include <linux/proc_fs.h>
42 #include <linux/seq_file.h>
43 #include <net/net_namespace.h>
46 #include <net/ip6_fib.h>
47 #include <net/ip6_route.h>
48 #include <net/ndisc.h>
49 #include <net/addrconf.h>
51 #include <linux/rtnetlink.h>
54 #include <net/netevent.h>
55 #include <net/netlink.h>
57 #include <asm/uaccess.h>
60 #include <linux/sysctl.h>
63 /* Set to 3 to get tracing. */
67 #define RDBG(x) printk x
68 #define RT6_TRACE(x...) printk(KERN_DEBUG x)
71 #define RT6_TRACE(x...) do { ; } while (0)
74 #define CLONE_OFFLINK_ROUTE 0
76 static int ip6_rt_max_size = 4096;
77 static int ip6_rt_gc_min_interval = HZ / 2;
78 static int ip6_rt_gc_timeout = 60*HZ;
79 int ip6_rt_gc_interval = 30*HZ;
80 static int ip6_rt_gc_elasticity = 9;
81 static int ip6_rt_mtu_expires = 10*60*HZ;
82 static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
84 static struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
85 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
86 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
87 static void ip6_dst_destroy(struct dst_entry *);
88 static void ip6_dst_ifdown(struct dst_entry *,
89 struct net_device *dev, int how);
90 static int ip6_dst_gc(void);
92 static int ip6_pkt_discard(struct sk_buff *skb);
93 static int ip6_pkt_discard_out(struct sk_buff *skb);
94 static void ip6_link_failure(struct sk_buff *skb);
95 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
97 #ifdef CONFIG_IPV6_ROUTE_INFO
98 static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
99 struct in6_addr *gwaddr, int ifindex,
101 static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
102 struct in6_addr *gwaddr, int ifindex);
105 static struct dst_ops ip6_dst_ops = {
107 .protocol = __constant_htons(ETH_P_IPV6),
110 .check = ip6_dst_check,
111 .destroy = ip6_dst_destroy,
112 .ifdown = ip6_dst_ifdown,
113 .negative_advice = ip6_negative_advice,
114 .link_failure = ip6_link_failure,
115 .update_pmtu = ip6_rt_update_pmtu,
116 .entry_size = sizeof(struct rt6_info),
119 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
123 static struct dst_ops ip6_dst_blackhole_ops = {
125 .protocol = __constant_htons(ETH_P_IPV6),
126 .destroy = ip6_dst_destroy,
127 .check = ip6_dst_check,
128 .update_pmtu = ip6_rt_blackhole_update_pmtu,
129 .entry_size = sizeof(struct rt6_info),
132 struct rt6_info ip6_null_entry = {
135 .__refcnt = ATOMIC_INIT(1),
138 .error = -ENETUNREACH,
139 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
140 .input = ip6_pkt_discard,
141 .output = ip6_pkt_discard_out,
143 .path = (struct dst_entry*)&ip6_null_entry,
146 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
147 .rt6i_metric = ~(u32) 0,
148 .rt6i_ref = ATOMIC_INIT(1),
151 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
153 static int ip6_pkt_prohibit(struct sk_buff *skb);
154 static int ip6_pkt_prohibit_out(struct sk_buff *skb);
155 static int ip6_pkt_blk_hole(struct sk_buff *skb);
157 struct rt6_info ip6_prohibit_entry = {
160 .__refcnt = ATOMIC_INIT(1),
164 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
165 .input = ip6_pkt_prohibit,
166 .output = ip6_pkt_prohibit_out,
168 .path = (struct dst_entry*)&ip6_prohibit_entry,
171 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
172 .rt6i_metric = ~(u32) 0,
173 .rt6i_ref = ATOMIC_INIT(1),
176 struct rt6_info ip6_blk_hole_entry = {
179 .__refcnt = ATOMIC_INIT(1),
183 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
184 .input = ip6_pkt_blk_hole,
185 .output = ip6_pkt_blk_hole,
187 .path = (struct dst_entry*)&ip6_blk_hole_entry,
190 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
191 .rt6i_metric = ~(u32) 0,
192 .rt6i_ref = ATOMIC_INIT(1),
197 /* allocate dst with ip6_dst_ops */
198 static __inline__ struct rt6_info *ip6_dst_alloc(void)
200 return (struct rt6_info *)dst_alloc(&ip6_dst_ops);
203 static void ip6_dst_destroy(struct dst_entry *dst)
205 struct rt6_info *rt = (struct rt6_info *)dst;
206 struct inet6_dev *idev = rt->rt6i_idev;
209 rt->rt6i_idev = NULL;
214 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
217 struct rt6_info *rt = (struct rt6_info *)dst;
218 struct inet6_dev *idev = rt->rt6i_idev;
220 if (dev != init_net.loopback_dev && idev != NULL && idev->dev == dev) {
221 struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev);
222 if (loopback_idev != NULL) {
223 rt->rt6i_idev = loopback_idev;
229 static __inline__ int rt6_check_expired(const struct rt6_info *rt)
231 return (rt->rt6i_flags & RTF_EXPIRES &&
232 time_after(jiffies, rt->rt6i_expires));
235 static inline int rt6_need_strict(struct in6_addr *daddr)
237 return (ipv6_addr_type(daddr) &
238 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
242 * Route lookup. Any table->tb6_lock is implied.
245 static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt,
249 struct rt6_info *local = NULL;
250 struct rt6_info *sprt;
253 for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) {
254 struct net_device *dev = sprt->rt6i_dev;
255 if (dev->ifindex == oif)
257 if (dev->flags & IFF_LOOPBACK) {
258 if (sprt->rt6i_idev == NULL ||
259 sprt->rt6i_idev->dev->ifindex != oif) {
262 if (local && (!oif ||
263 local->rt6i_idev->dev->ifindex == oif))
274 return &ip6_null_entry;
279 #ifdef CONFIG_IPV6_ROUTER_PREF
280 static void rt6_probe(struct rt6_info *rt)
282 struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL;
284 * Okay, this does not seem to be appropriate
285 * for now, however, we need to check if it
286 * is really so; aka Router Reachability Probing.
288 * Router Reachability Probe MUST be rate-limited
289 * to no more than one per minute.
291 if (!neigh || (neigh->nud_state & NUD_VALID))
293 read_lock_bh(&neigh->lock);
294 if (!(neigh->nud_state & NUD_VALID) &&
295 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
296 struct in6_addr mcaddr;
297 struct in6_addr *target;
299 neigh->updated = jiffies;
300 read_unlock_bh(&neigh->lock);
302 target = (struct in6_addr *)&neigh->primary_key;
303 addrconf_addr_solict_mult(target, &mcaddr);
304 ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL);
306 read_unlock_bh(&neigh->lock);
309 static inline void rt6_probe(struct rt6_info *rt)
316 * Default Router Selection (RFC 2461 6.3.6)
318 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
320 struct net_device *dev = rt->rt6i_dev;
321 if (!oif || dev->ifindex == oif)
323 if ((dev->flags & IFF_LOOPBACK) &&
324 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
329 static inline int rt6_check_neigh(struct rt6_info *rt)
331 struct neighbour *neigh = rt->rt6i_nexthop;
333 if (rt->rt6i_flags & RTF_NONEXTHOP ||
334 !(rt->rt6i_flags & RTF_GATEWAY))
337 read_lock_bh(&neigh->lock);
338 if (neigh->nud_state & NUD_VALID)
340 else if (!(neigh->nud_state & NUD_FAILED))
342 read_unlock_bh(&neigh->lock);
347 static int rt6_score_route(struct rt6_info *rt, int oif,
352 m = rt6_check_dev(rt, oif);
353 if (!m && (strict & RT6_LOOKUP_F_IFACE))
355 #ifdef CONFIG_IPV6_ROUTER_PREF
356 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
358 n = rt6_check_neigh(rt);
359 if (!n && (strict & RT6_LOOKUP_F_REACHABLE))
364 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
365 int *mpri, struct rt6_info *match)
369 if (rt6_check_expired(rt))
372 m = rt6_score_route(rt, oif, strict);
377 if (strict & RT6_LOOKUP_F_REACHABLE)
381 } else if (strict & RT6_LOOKUP_F_REACHABLE) {
389 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
390 struct rt6_info *rr_head,
391 u32 metric, int oif, int strict)
393 struct rt6_info *rt, *match;
397 for (rt = rr_head; rt && rt->rt6i_metric == metric;
398 rt = rt->u.dst.rt6_next)
399 match = find_match(rt, oif, strict, &mpri, match);
400 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
401 rt = rt->u.dst.rt6_next)
402 match = find_match(rt, oif, strict, &mpri, match);
407 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
409 struct rt6_info *match, *rt0;
411 RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n",
412 __FUNCTION__, fn->leaf, oif);
416 fn->rr_ptr = rt0 = fn->leaf;
418 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict);
421 (strict & RT6_LOOKUP_F_REACHABLE)) {
422 struct rt6_info *next = rt0->u.dst.rt6_next;
424 /* no entries matched; do round-robin */
425 if (!next || next->rt6i_metric != rt0->rt6i_metric)
432 RT6_TRACE("%s() => %p\n",
433 __FUNCTION__, match);
435 return (match ? match : &ip6_null_entry);
438 #ifdef CONFIG_IPV6_ROUTE_INFO
439 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
440 struct in6_addr *gwaddr)
442 struct route_info *rinfo = (struct route_info *) opt;
443 struct in6_addr prefix_buf, *prefix;
448 if (len < sizeof(struct route_info)) {
452 /* Sanity check for prefix_len and length */
453 if (rinfo->length > 3) {
455 } else if (rinfo->prefix_len > 128) {
457 } else if (rinfo->prefix_len > 64) {
458 if (rinfo->length < 2) {
461 } else if (rinfo->prefix_len > 0) {
462 if (rinfo->length < 1) {
467 pref = rinfo->route_pref;
468 if (pref == ICMPV6_ROUTER_PREF_INVALID)
469 pref = ICMPV6_ROUTER_PREF_MEDIUM;
471 lifetime = ntohl(rinfo->lifetime);
472 if (lifetime == 0xffffffff) {
474 } else if (lifetime > 0x7fffffff/HZ) {
475 /* Avoid arithmetic overflow */
476 lifetime = 0x7fffffff/HZ - 1;
479 if (rinfo->length == 3)
480 prefix = (struct in6_addr *)rinfo->prefix;
482 /* this function is safe */
483 ipv6_addr_prefix(&prefix_buf,
484 (struct in6_addr *)rinfo->prefix,
486 prefix = &prefix_buf;
489 rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex);
491 if (rt && !lifetime) {
497 rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
500 rt->rt6i_flags = RTF_ROUTEINFO |
501 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
504 if (lifetime == 0xffffffff) {
505 rt->rt6i_flags &= ~RTF_EXPIRES;
507 rt->rt6i_expires = jiffies + HZ * lifetime;
508 rt->rt6i_flags |= RTF_EXPIRES;
510 dst_release(&rt->u.dst);
516 #define BACKTRACK(saddr) \
518 if (rt == &ip6_null_entry) { \
519 struct fib6_node *pn; \
521 if (fn->fn_flags & RTN_TL_ROOT) \
524 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
525 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
528 if (fn->fn_flags & RTN_RTINFO) \
534 static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table,
535 struct flowi *fl, int flags)
537 struct fib6_node *fn;
540 read_lock_bh(&table->tb6_lock);
541 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
544 rt = rt6_device_match(rt, fl->oif, flags);
545 BACKTRACK(&fl->fl6_src);
547 dst_hold(&rt->u.dst);
548 read_unlock_bh(&table->tb6_lock);
550 rt->u.dst.lastuse = jiffies;
557 struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
568 struct dst_entry *dst;
569 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
572 memcpy(&fl.fl6_src, saddr, sizeof(*saddr));
573 flags |= RT6_LOOKUP_F_HAS_SADDR;
576 dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup);
578 return (struct rt6_info *) dst;
585 EXPORT_SYMBOL(rt6_lookup);
587 /* ip6_ins_rt is called with FREE table->tb6_lock.
588 It takes new route entry, the addition fails by any reason the
589 route is freed. In any case, if caller does not hold it, it may
593 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
596 struct fib6_table *table;
598 table = rt->rt6i_table;
599 write_lock_bh(&table->tb6_lock);
600 err = fib6_add(&table->tb6_root, rt, info);
601 write_unlock_bh(&table->tb6_lock);
606 int ip6_ins_rt(struct rt6_info *rt)
608 return __ip6_ins_rt(rt, NULL);
611 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
612 struct in6_addr *saddr)
620 rt = ip6_rt_copy(ort);
623 if (!(rt->rt6i_flags&RTF_GATEWAY)) {
624 if (rt->rt6i_dst.plen != 128 &&
625 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr))
626 rt->rt6i_flags |= RTF_ANYCAST;
627 ipv6_addr_copy(&rt->rt6i_gateway, daddr);
630 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
631 rt->rt6i_dst.plen = 128;
632 rt->rt6i_flags |= RTF_CACHE;
633 rt->u.dst.flags |= DST_HOST;
635 #ifdef CONFIG_IPV6_SUBTREES
636 if (rt->rt6i_src.plen && saddr) {
637 ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
638 rt->rt6i_src.plen = 128;
642 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
649 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr)
651 struct rt6_info *rt = ip6_rt_copy(ort);
653 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
654 rt->rt6i_dst.plen = 128;
655 rt->rt6i_flags |= RTF_CACHE;
656 rt->u.dst.flags |= DST_HOST;
657 rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
662 static struct rt6_info *ip6_pol_route(struct fib6_table *table, int oif,
663 struct flowi *fl, int flags)
665 struct fib6_node *fn;
666 struct rt6_info *rt, *nrt;
670 int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
672 strict |= flags & RT6_LOOKUP_F_IFACE;
675 read_lock_bh(&table->tb6_lock);
678 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
681 rt = rt6_select(fn, oif, strict | reachable);
682 BACKTRACK(&fl->fl6_src);
683 if (rt == &ip6_null_entry ||
684 rt->rt6i_flags & RTF_CACHE)
687 dst_hold(&rt->u.dst);
688 read_unlock_bh(&table->tb6_lock);
690 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
691 nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
693 #if CLONE_OFFLINK_ROUTE
694 nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
700 dst_release(&rt->u.dst);
701 rt = nrt ? : &ip6_null_entry;
703 dst_hold(&rt->u.dst);
705 err = ip6_ins_rt(nrt);
714 * Race condition! In the gap, when table->tb6_lock was
715 * released someone could insert this route. Relookup.
717 dst_release(&rt->u.dst);
725 dst_hold(&rt->u.dst);
726 read_unlock_bh(&table->tb6_lock);
728 rt->u.dst.lastuse = jiffies;
734 static struct rt6_info *ip6_pol_route_input(struct fib6_table *table,
735 struct flowi *fl, int flags)
737 return ip6_pol_route(table, fl->iif, fl, flags);
740 void ip6_route_input(struct sk_buff *skb)
742 struct ipv6hdr *iph = ipv6_hdr(skb);
743 int flags = RT6_LOOKUP_F_HAS_SADDR;
745 .iif = skb->dev->ifindex,
750 .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK,
754 .proto = iph->nexthdr,
757 if (rt6_need_strict(&iph->daddr))
758 flags |= RT6_LOOKUP_F_IFACE;
760 skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input);
763 static struct rt6_info *ip6_pol_route_output(struct fib6_table *table,
764 struct flowi *fl, int flags)
766 return ip6_pol_route(table, fl->oif, fl, flags);
769 struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
773 if (rt6_need_strict(&fl->fl6_dst))
774 flags |= RT6_LOOKUP_F_IFACE;
776 if (!ipv6_addr_any(&fl->fl6_src))
777 flags |= RT6_LOOKUP_F_HAS_SADDR;
779 return fib6_rule_lookup(fl, flags, ip6_pol_route_output);
782 EXPORT_SYMBOL(ip6_route_output);
784 static int ip6_blackhole_output(struct sk_buff *skb)
790 int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl)
792 struct rt6_info *ort = (struct rt6_info *) *dstp;
793 struct rt6_info *rt = (struct rt6_info *)
794 dst_alloc(&ip6_dst_blackhole_ops);
795 struct dst_entry *new = NULL;
800 atomic_set(&new->__refcnt, 1);
802 new->input = ip6_blackhole_output;
803 new->output = ip6_blackhole_output;
805 memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
806 new->dev = ort->u.dst.dev;
809 rt->rt6i_idev = ort->rt6i_idev;
811 in6_dev_hold(rt->rt6i_idev);
812 rt->rt6i_expires = 0;
814 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
815 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
818 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
819 #ifdef CONFIG_IPV6_SUBTREES
820 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
828 return (new ? 0 : -ENOMEM);
830 EXPORT_SYMBOL_GPL(ip6_dst_blackhole);
833 * Destination cache support functions
836 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
840 rt = (struct rt6_info *) dst;
842 if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
848 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
850 struct rt6_info *rt = (struct rt6_info *) dst;
853 if (rt->rt6i_flags & RTF_CACHE)
861 static void ip6_link_failure(struct sk_buff *skb)
865 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
867 rt = (struct rt6_info *) skb->dst;
869 if (rt->rt6i_flags&RTF_CACHE) {
870 dst_set_expires(&rt->u.dst, 0);
871 rt->rt6i_flags |= RTF_EXPIRES;
872 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
873 rt->rt6i_node->fn_sernum = -1;
877 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
879 struct rt6_info *rt6 = (struct rt6_info*)dst;
881 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
882 rt6->rt6i_flags |= RTF_MODIFIED;
883 if (mtu < IPV6_MIN_MTU) {
885 dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
887 dst->metrics[RTAX_MTU-1] = mtu;
888 call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
892 static int ipv6_get_mtu(struct net_device *dev);
894 static inline unsigned int ipv6_advmss(unsigned int mtu)
896 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
898 if (mtu < ip6_rt_min_advmss)
899 mtu = ip6_rt_min_advmss;
902 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
903 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
904 * IPV6_MAXPLEN is also valid and means: "any MSS,
905 * rely only on pmtu discovery"
907 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
912 static struct dst_entry *ndisc_dst_gc_list;
913 static DEFINE_SPINLOCK(ndisc_lock);
915 struct dst_entry *ndisc_dst_alloc(struct net_device *dev,
916 struct neighbour *neigh,
917 struct in6_addr *addr,
918 int (*output)(struct sk_buff *))
921 struct inet6_dev *idev = in6_dev_get(dev);
923 if (unlikely(idev == NULL))
926 rt = ip6_dst_alloc();
927 if (unlikely(rt == NULL)) {
936 neigh = ndisc_get_neigh(dev, addr);
939 rt->rt6i_idev = idev;
940 rt->rt6i_nexthop = neigh;
941 atomic_set(&rt->u.dst.__refcnt, 1);
942 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
943 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
944 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
945 rt->u.dst.output = output;
947 #if 0 /* there's no chance to use these for ndisc */
948 rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
951 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
952 rt->rt6i_dst.plen = 128;
955 spin_lock_bh(&ndisc_lock);
956 rt->u.dst.next = ndisc_dst_gc_list;
957 ndisc_dst_gc_list = &rt->u.dst;
958 spin_unlock_bh(&ndisc_lock);
960 fib6_force_start_gc();
966 int ndisc_dst_gc(int *more)
968 struct dst_entry *dst, *next, **pprev;
974 spin_lock_bh(&ndisc_lock);
975 pprev = &ndisc_dst_gc_list;
977 while ((dst = *pprev) != NULL) {
978 if (!atomic_read(&dst->__refcnt)) {
988 spin_unlock_bh(&ndisc_lock);
993 static int ip6_dst_gc(void)
995 static unsigned expire = 30*HZ;
996 static unsigned long last_gc;
997 unsigned long now = jiffies;
999 if (time_after(last_gc + ip6_rt_gc_min_interval, now) &&
1000 atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size)
1004 fib6_run_gc(expire);
1006 if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh)
1007 expire = ip6_rt_gc_timeout>>1;
1010 expire -= expire>>ip6_rt_gc_elasticity;
1011 return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size);
1014 /* Clean host part of a prefix. Not necessary in radix tree,
1015 but results in cleaner routing tables.
1017 Remove it only when all the things will work!
1020 static int ipv6_get_mtu(struct net_device *dev)
1022 int mtu = IPV6_MIN_MTU;
1023 struct inet6_dev *idev;
1025 idev = in6_dev_get(dev);
1027 mtu = idev->cnf.mtu6;
1033 int ipv6_get_hoplimit(struct net_device *dev)
1035 int hoplimit = ipv6_devconf.hop_limit;
1036 struct inet6_dev *idev;
1038 idev = in6_dev_get(dev);
1040 hoplimit = idev->cnf.hop_limit;
1050 int ip6_route_add(struct fib6_config *cfg)
1053 struct rt6_info *rt = NULL;
1054 struct net_device *dev = NULL;
1055 struct inet6_dev *idev = NULL;
1056 struct fib6_table *table;
1059 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1061 #ifndef CONFIG_IPV6_SUBTREES
1062 if (cfg->fc_src_len)
1065 if (cfg->fc_ifindex) {
1067 dev = dev_get_by_index(&init_net, cfg->fc_ifindex);
1070 idev = in6_dev_get(dev);
1075 if (cfg->fc_metric == 0)
1076 cfg->fc_metric = IP6_RT_PRIO_USER;
1078 table = fib6_new_table(cfg->fc_table);
1079 if (table == NULL) {
1084 rt = ip6_dst_alloc();
1091 rt->u.dst.obsolete = -1;
1092 rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires);
1094 if (cfg->fc_protocol == RTPROT_UNSPEC)
1095 cfg->fc_protocol = RTPROT_BOOT;
1096 rt->rt6i_protocol = cfg->fc_protocol;
1098 addr_type = ipv6_addr_type(&cfg->fc_dst);
1100 if (addr_type & IPV6_ADDR_MULTICAST)
1101 rt->u.dst.input = ip6_mc_input;
1103 rt->u.dst.input = ip6_forward;
1105 rt->u.dst.output = ip6_output;
1107 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1108 rt->rt6i_dst.plen = cfg->fc_dst_len;
1109 if (rt->rt6i_dst.plen == 128)
1110 rt->u.dst.flags = DST_HOST;
1112 #ifdef CONFIG_IPV6_SUBTREES
1113 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1114 rt->rt6i_src.plen = cfg->fc_src_len;
1117 rt->rt6i_metric = cfg->fc_metric;
1119 /* We cannot add true routes via loopback here,
1120 they would result in kernel looping; promote them to reject routes
1122 if ((cfg->fc_flags & RTF_REJECT) ||
1123 (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
1124 /* hold loopback dev/idev if we haven't done so. */
1125 if (dev != init_net.loopback_dev) {
1130 dev = init_net.loopback_dev;
1132 idev = in6_dev_get(dev);
1138 rt->u.dst.output = ip6_pkt_discard_out;
1139 rt->u.dst.input = ip6_pkt_discard;
1140 rt->u.dst.error = -ENETUNREACH;
1141 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1145 if (cfg->fc_flags & RTF_GATEWAY) {
1146 struct in6_addr *gw_addr;
1149 gw_addr = &cfg->fc_gateway;
1150 ipv6_addr_copy(&rt->rt6i_gateway, gw_addr);
1151 gwa_type = ipv6_addr_type(gw_addr);
1153 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1154 struct rt6_info *grt;
1156 /* IPv6 strictly inhibits using not link-local
1157 addresses as nexthop address.
1158 Otherwise, router will not able to send redirects.
1159 It is very good, but in some (rare!) circumstances
1160 (SIT, PtP, NBMA NOARP links) it is handy to allow
1161 some exceptions. --ANK
1164 if (!(gwa_type&IPV6_ADDR_UNICAST))
1167 grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1);
1169 err = -EHOSTUNREACH;
1173 if (dev != grt->rt6i_dev) {
1174 dst_release(&grt->u.dst);
1178 dev = grt->rt6i_dev;
1179 idev = grt->rt6i_idev;
1181 in6_dev_hold(grt->rt6i_idev);
1183 if (!(grt->rt6i_flags&RTF_GATEWAY))
1185 dst_release(&grt->u.dst);
1191 if (dev == NULL || (dev->flags&IFF_LOOPBACK))
1199 if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
1200 rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
1201 if (IS_ERR(rt->rt6i_nexthop)) {
1202 err = PTR_ERR(rt->rt6i_nexthop);
1203 rt->rt6i_nexthop = NULL;
1208 rt->rt6i_flags = cfg->fc_flags;
1215 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1216 int type = nla_type(nla);
1219 if (type > RTAX_MAX) {
1224 rt->u.dst.metrics[type - 1] = nla_get_u32(nla);
1229 if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
1230 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1231 if (!rt->u.dst.metrics[RTAX_MTU-1])
1232 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
1233 if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
1234 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
1235 rt->u.dst.dev = dev;
1236 rt->rt6i_idev = idev;
1237 rt->rt6i_table = table;
1238 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1246 dst_free(&rt->u.dst);
1250 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1253 struct fib6_table *table;
1255 if (rt == &ip6_null_entry)
1258 table = rt->rt6i_table;
1259 write_lock_bh(&table->tb6_lock);
1261 err = fib6_del(rt, info);
1262 dst_release(&rt->u.dst);
1264 write_unlock_bh(&table->tb6_lock);
1269 int ip6_del_rt(struct rt6_info *rt)
1271 return __ip6_del_rt(rt, NULL);
1274 static int ip6_route_del(struct fib6_config *cfg)
1276 struct fib6_table *table;
1277 struct fib6_node *fn;
1278 struct rt6_info *rt;
1281 table = fib6_get_table(cfg->fc_table);
1285 read_lock_bh(&table->tb6_lock);
1287 fn = fib6_locate(&table->tb6_root,
1288 &cfg->fc_dst, cfg->fc_dst_len,
1289 &cfg->fc_src, cfg->fc_src_len);
1292 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1293 if (cfg->fc_ifindex &&
1294 (rt->rt6i_dev == NULL ||
1295 rt->rt6i_dev->ifindex != cfg->fc_ifindex))
1297 if (cfg->fc_flags & RTF_GATEWAY &&
1298 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1300 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1302 dst_hold(&rt->u.dst);
1303 read_unlock_bh(&table->tb6_lock);
1305 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1308 read_unlock_bh(&table->tb6_lock);
1316 struct ip6rd_flowi {
1318 struct in6_addr gateway;
1321 static struct rt6_info *__ip6_route_redirect(struct fib6_table *table,
1325 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;
1326 struct rt6_info *rt;
1327 struct fib6_node *fn;
1330 * Get the "current" route for this destination and
1331 * check if the redirect has come from approriate router.
1333 * RFC 2461 specifies that redirects should only be
1334 * accepted if they come from the nexthop to the target.
1335 * Due to the way the routes are chosen, this notion
1336 * is a bit fuzzy and one might need to check all possible
1340 read_lock_bh(&table->tb6_lock);
1341 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1343 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1345 * Current route is on-link; redirect is always invalid.
1347 * Seems, previous statement is not true. It could
1348 * be node, which looks for us as on-link (f.e. proxy ndisc)
1349 * But then router serving it might decide, that we should
1350 * know truth 8)8) --ANK (980726).
1352 if (rt6_check_expired(rt))
1354 if (!(rt->rt6i_flags & RTF_GATEWAY))
1356 if (fl->oif != rt->rt6i_dev->ifindex)
1358 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1364 rt = &ip6_null_entry;
1365 BACKTRACK(&fl->fl6_src);
1367 dst_hold(&rt->u.dst);
1369 read_unlock_bh(&table->tb6_lock);
1374 static struct rt6_info *ip6_route_redirect(struct in6_addr *dest,
1375 struct in6_addr *src,
1376 struct in6_addr *gateway,
1377 struct net_device *dev)
1379 int flags = RT6_LOOKUP_F_HAS_SADDR;
1380 struct ip6rd_flowi rdfl = {
1382 .oif = dev->ifindex,
1390 .gateway = *gateway,
1393 if (rt6_need_strict(dest))
1394 flags |= RT6_LOOKUP_F_IFACE;
1396 return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect);
1399 void rt6_redirect(struct in6_addr *dest, struct in6_addr *src,
1400 struct in6_addr *saddr,
1401 struct neighbour *neigh, u8 *lladdr, int on_link)
1403 struct rt6_info *rt, *nrt = NULL;
1404 struct netevent_redirect netevent;
1406 rt = ip6_route_redirect(dest, src, saddr, neigh->dev);
1408 if (rt == &ip6_null_entry) {
1409 if (net_ratelimit())
1410 printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
1411 "for redirect target\n");
1416 * We have finally decided to accept it.
1419 neigh_update(neigh, lladdr, NUD_STALE,
1420 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1421 NEIGH_UPDATE_F_OVERRIDE|
1422 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1423 NEIGH_UPDATE_F_ISROUTER))
1427 * Redirect received -> path was valid.
1428 * Look, redirects are sent only in response to data packets,
1429 * so that this nexthop apparently is reachable. --ANK
1431 dst_confirm(&rt->u.dst);
1433 /* Duplicate redirect: silently ignore. */
1434 if (neigh == rt->u.dst.neighbour)
1437 nrt = ip6_rt_copy(rt);
1441 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1443 nrt->rt6i_flags &= ~RTF_GATEWAY;
1445 ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
1446 nrt->rt6i_dst.plen = 128;
1447 nrt->u.dst.flags |= DST_HOST;
1449 ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
1450 nrt->rt6i_nexthop = neigh_clone(neigh);
1451 /* Reset pmtu, it may be better */
1452 nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
1453 nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst));
1455 if (ip6_ins_rt(nrt))
1458 netevent.old = &rt->u.dst;
1459 netevent.new = &nrt->u.dst;
1460 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1462 if (rt->rt6i_flags&RTF_CACHE) {
1468 dst_release(&rt->u.dst);
1473 * Handle ICMP "packet too big" messages
1474 * i.e. Path MTU discovery
1477 void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
1478 struct net_device *dev, u32 pmtu)
1480 struct rt6_info *rt, *nrt;
1483 rt = rt6_lookup(daddr, saddr, dev->ifindex, 0);
1487 if (pmtu >= dst_mtu(&rt->u.dst))
1490 if (pmtu < IPV6_MIN_MTU) {
1492 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
1493 * MTU (1280) and a fragment header should always be included
1494 * after a node receiving Too Big message reporting PMTU is
1495 * less than the IPv6 Minimum Link MTU.
1497 pmtu = IPV6_MIN_MTU;
1501 /* New mtu received -> path was valid.
1502 They are sent only in response to data packets,
1503 so that this nexthop apparently is reachable. --ANK
1505 dst_confirm(&rt->u.dst);
1507 /* Host route. If it is static, it would be better
1508 not to override it, but add new one, so that
1509 when cache entry will expire old pmtu
1510 would return automatically.
1512 if (rt->rt6i_flags & RTF_CACHE) {
1513 rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1515 rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1516 dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires);
1517 rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
1522 Two cases are possible:
1523 1. It is connected route. Action: COW
1524 2. It is gatewayed route or NONEXTHOP route. Action: clone it.
1526 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
1527 nrt = rt6_alloc_cow(rt, daddr, saddr);
1529 nrt = rt6_alloc_clone(rt, daddr);
1532 nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1534 nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1536 /* According to RFC 1981, detecting PMTU increase shouldn't be
1537 * happened within 5 mins, the recommended timer is 10 mins.
1538 * Here this route expiration time is set to ip6_rt_mtu_expires
1539 * which is 10 mins. After 10 mins the decreased pmtu is expired
1540 * and detecting PMTU increase will be automatically happened.
1542 dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
1543 nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
1548 dst_release(&rt->u.dst);
1552 * Misc support functions
1555 static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
1557 struct rt6_info *rt = ip6_dst_alloc();
1560 rt->u.dst.input = ort->u.dst.input;
1561 rt->u.dst.output = ort->u.dst.output;
1563 memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
1564 rt->u.dst.error = ort->u.dst.error;
1565 rt->u.dst.dev = ort->u.dst.dev;
1567 dev_hold(rt->u.dst.dev);
1568 rt->rt6i_idev = ort->rt6i_idev;
1570 in6_dev_hold(rt->rt6i_idev);
1571 rt->u.dst.lastuse = jiffies;
1572 rt->rt6i_expires = 0;
1574 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
1575 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
1576 rt->rt6i_metric = 0;
1578 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1579 #ifdef CONFIG_IPV6_SUBTREES
1580 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1582 rt->rt6i_table = ort->rt6i_table;
1587 #ifdef CONFIG_IPV6_ROUTE_INFO
1588 static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
1589 struct in6_addr *gwaddr, int ifindex)
1591 struct fib6_node *fn;
1592 struct rt6_info *rt = NULL;
1593 struct fib6_table *table;
1595 table = fib6_get_table(RT6_TABLE_INFO);
1599 write_lock_bh(&table->tb6_lock);
1600 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1604 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1605 if (rt->rt6i_dev->ifindex != ifindex)
1607 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1609 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1611 dst_hold(&rt->u.dst);
1615 write_unlock_bh(&table->tb6_lock);
1619 static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
1620 struct in6_addr *gwaddr, int ifindex,
1623 struct fib6_config cfg = {
1624 .fc_table = RT6_TABLE_INFO,
1626 .fc_ifindex = ifindex,
1627 .fc_dst_len = prefixlen,
1628 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1629 RTF_UP | RTF_PREF(pref),
1632 ipv6_addr_copy(&cfg.fc_dst, prefix);
1633 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1635 /* We should treat it as a default route if prefix length is 0. */
1637 cfg.fc_flags |= RTF_DEFAULT;
1639 ip6_route_add(&cfg);
1641 return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex);
1645 struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
1647 struct rt6_info *rt;
1648 struct fib6_table *table;
1650 table = fib6_get_table(RT6_TABLE_DFLT);
1654 write_lock_bh(&table->tb6_lock);
1655 for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) {
1656 if (dev == rt->rt6i_dev &&
1657 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1658 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1662 dst_hold(&rt->u.dst);
1663 write_unlock_bh(&table->tb6_lock);
1667 struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1668 struct net_device *dev,
1671 struct fib6_config cfg = {
1672 .fc_table = RT6_TABLE_DFLT,
1674 .fc_ifindex = dev->ifindex,
1675 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1676 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1679 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1681 ip6_route_add(&cfg);
1683 return rt6_get_dflt_router(gwaddr, dev);
1686 void rt6_purge_dflt_routers(void)
1688 struct rt6_info *rt;
1689 struct fib6_table *table;
1691 /* NOTE: Keep consistent with rt6_get_dflt_router */
1692 table = fib6_get_table(RT6_TABLE_DFLT);
1697 read_lock_bh(&table->tb6_lock);
1698 for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) {
1699 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
1700 dst_hold(&rt->u.dst);
1701 read_unlock_bh(&table->tb6_lock);
1706 read_unlock_bh(&table->tb6_lock);
1709 static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg,
1710 struct fib6_config *cfg)
1712 memset(cfg, 0, sizeof(*cfg));
1714 cfg->fc_table = RT6_TABLE_MAIN;
1715 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1716 cfg->fc_metric = rtmsg->rtmsg_metric;
1717 cfg->fc_expires = rtmsg->rtmsg_info;
1718 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1719 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1720 cfg->fc_flags = rtmsg->rtmsg_flags;
1722 ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst);
1723 ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src);
1724 ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway);
1727 int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
1729 struct fib6_config cfg;
1730 struct in6_rtmsg rtmsg;
1734 case SIOCADDRT: /* Add a route */
1735 case SIOCDELRT: /* Delete a route */
1736 if (!capable(CAP_NET_ADMIN))
1738 err = copy_from_user(&rtmsg, arg,
1739 sizeof(struct in6_rtmsg));
1743 rtmsg_to_fib6_config(&rtmsg, &cfg);
1748 err = ip6_route_add(&cfg);
1751 err = ip6_route_del(&cfg);
1765 * Drop the packet on the floor
1768 static inline int ip6_pkt_drop(struct sk_buff *skb, int code,
1769 int ipstats_mib_noroutes)
1772 switch (ipstats_mib_noroutes) {
1773 case IPSTATS_MIB_INNOROUTES:
1774 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
1775 if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) {
1776 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS);
1780 case IPSTATS_MIB_OUTNOROUTES:
1781 IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes);
1784 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev);
1789 static int ip6_pkt_discard(struct sk_buff *skb)
1791 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
1794 static int ip6_pkt_discard_out(struct sk_buff *skb)
1796 skb->dev = skb->dst->dev;
1797 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1800 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
1802 static int ip6_pkt_prohibit(struct sk_buff *skb)
1804 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
1807 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
1809 skb->dev = skb->dst->dev;
1810 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
1813 static int ip6_pkt_blk_hole(struct sk_buff *skb)
1822 * Allocate a dst for local (unicast / anycast) address.
1825 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
1826 const struct in6_addr *addr,
1829 struct rt6_info *rt = ip6_dst_alloc();
1832 return ERR_PTR(-ENOMEM);
1834 dev_hold(init_net.loopback_dev);
1837 rt->u.dst.flags = DST_HOST;
1838 rt->u.dst.input = ip6_input;
1839 rt->u.dst.output = ip6_output;
1840 rt->rt6i_dev = init_net.loopback_dev;
1841 rt->rt6i_idev = idev;
1842 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
1843 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
1844 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1845 rt->u.dst.obsolete = -1;
1847 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
1849 rt->rt6i_flags |= RTF_ANYCAST;
1851 rt->rt6i_flags |= RTF_LOCAL;
1852 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
1853 if (rt->rt6i_nexthop == NULL) {
1854 dst_free(&rt->u.dst);
1855 return ERR_PTR(-ENOMEM);
1858 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
1859 rt->rt6i_dst.plen = 128;
1860 rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL);
1862 atomic_set(&rt->u.dst.__refcnt, 1);
1867 static int fib6_ifdown(struct rt6_info *rt, void *arg)
1869 if (((void*)rt->rt6i_dev == arg || arg == NULL) &&
1870 rt != &ip6_null_entry) {
1871 RT6_TRACE("deleted by ifdown %p\n", rt);
1877 void rt6_ifdown(struct net_device *dev)
1879 fib6_clean_all(fib6_ifdown, 0, dev);
1882 struct rt6_mtu_change_arg
1884 struct net_device *dev;
1888 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
1890 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
1891 struct inet6_dev *idev;
1893 /* In IPv6 pmtu discovery is not optional,
1894 so that RTAX_MTU lock cannot disable it.
1895 We still use this lock to block changes
1896 caused by addrconf/ndisc.
1899 idev = __in6_dev_get(arg->dev);
1903 /* For administrative MTU increase, there is no way to discover
1904 IPv6 PMTU increase, so PMTU increase should be updated here.
1905 Since RFC 1981 doesn't include administrative MTU increase
1906 update PMTU increase is a MUST. (i.e. jumbo frame)
1909 If new MTU is less than route PMTU, this new MTU will be the
1910 lowest MTU in the path, update the route PMTU to reflect PMTU
1911 decreases; if new MTU is greater than route PMTU, and the
1912 old MTU is the lowest MTU in the path, update the route PMTU
1913 to reflect the increase. In this case if the other nodes' MTU
1914 also have the lowest MTU, TOO BIG MESSAGE will be lead to
1917 if (rt->rt6i_dev == arg->dev &&
1918 !dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
1919 (dst_mtu(&rt->u.dst) > arg->mtu ||
1920 (dst_mtu(&rt->u.dst) < arg->mtu &&
1921 dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) {
1922 rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
1923 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
1928 void rt6_mtu_change(struct net_device *dev, unsigned mtu)
1930 struct rt6_mtu_change_arg arg = {
1935 fib6_clean_all(rt6_mtu_change_route, 0, &arg);
1938 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
1939 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
1940 [RTA_OIF] = { .type = NLA_U32 },
1941 [RTA_IIF] = { .type = NLA_U32 },
1942 [RTA_PRIORITY] = { .type = NLA_U32 },
1943 [RTA_METRICS] = { .type = NLA_NESTED },
1946 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
1947 struct fib6_config *cfg)
1950 struct nlattr *tb[RTA_MAX+1];
1953 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
1958 rtm = nlmsg_data(nlh);
1959 memset(cfg, 0, sizeof(*cfg));
1961 cfg->fc_table = rtm->rtm_table;
1962 cfg->fc_dst_len = rtm->rtm_dst_len;
1963 cfg->fc_src_len = rtm->rtm_src_len;
1964 cfg->fc_flags = RTF_UP;
1965 cfg->fc_protocol = rtm->rtm_protocol;
1967 if (rtm->rtm_type == RTN_UNREACHABLE)
1968 cfg->fc_flags |= RTF_REJECT;
1970 cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
1971 cfg->fc_nlinfo.nlh = nlh;
1973 if (tb[RTA_GATEWAY]) {
1974 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
1975 cfg->fc_flags |= RTF_GATEWAY;
1979 int plen = (rtm->rtm_dst_len + 7) >> 3;
1981 if (nla_len(tb[RTA_DST]) < plen)
1984 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1988 int plen = (rtm->rtm_src_len + 7) >> 3;
1990 if (nla_len(tb[RTA_SRC]) < plen)
1993 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1997 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
1999 if (tb[RTA_PRIORITY])
2000 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2002 if (tb[RTA_METRICS]) {
2003 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2004 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2008 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2015 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2017 struct fib6_config cfg;
2020 err = rtm_to_fib6_config(skb, nlh, &cfg);
2024 return ip6_route_del(&cfg);
2027 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2029 struct fib6_config cfg;
2032 err = rtm_to_fib6_config(skb, nlh, &cfg);
2036 return ip6_route_add(&cfg);
2039 static inline size_t rt6_nlmsg_size(void)
2041 return NLMSG_ALIGN(sizeof(struct rtmsg))
2042 + nla_total_size(16) /* RTA_SRC */
2043 + nla_total_size(16) /* RTA_DST */
2044 + nla_total_size(16) /* RTA_GATEWAY */
2045 + nla_total_size(16) /* RTA_PREFSRC */
2046 + nla_total_size(4) /* RTA_TABLE */
2047 + nla_total_size(4) /* RTA_IIF */
2048 + nla_total_size(4) /* RTA_OIF */
2049 + nla_total_size(4) /* RTA_PRIORITY */
2050 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2051 + nla_total_size(sizeof(struct rta_cacheinfo));
2054 static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
2055 struct in6_addr *dst, struct in6_addr *src,
2056 int iif, int type, u32 pid, u32 seq,
2057 int prefix, unsigned int flags)
2060 struct nlmsghdr *nlh;
2064 if (prefix) { /* user wants prefix routes only */
2065 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2066 /* success since this is not a prefix route */
2071 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
2075 rtm = nlmsg_data(nlh);
2076 rtm->rtm_family = AF_INET6;
2077 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2078 rtm->rtm_src_len = rt->rt6i_src.plen;
2081 table = rt->rt6i_table->tb6_id;
2083 table = RT6_TABLE_UNSPEC;
2084 rtm->rtm_table = table;
2085 NLA_PUT_U32(skb, RTA_TABLE, table);
2086 if (rt->rt6i_flags&RTF_REJECT)
2087 rtm->rtm_type = RTN_UNREACHABLE;
2088 else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
2089 rtm->rtm_type = RTN_LOCAL;
2091 rtm->rtm_type = RTN_UNICAST;
2093 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2094 rtm->rtm_protocol = rt->rt6i_protocol;
2095 if (rt->rt6i_flags&RTF_DYNAMIC)
2096 rtm->rtm_protocol = RTPROT_REDIRECT;
2097 else if (rt->rt6i_flags & RTF_ADDRCONF)
2098 rtm->rtm_protocol = RTPROT_KERNEL;
2099 else if (rt->rt6i_flags&RTF_DEFAULT)
2100 rtm->rtm_protocol = RTPROT_RA;
2102 if (rt->rt6i_flags&RTF_CACHE)
2103 rtm->rtm_flags |= RTM_F_CLONED;
2106 NLA_PUT(skb, RTA_DST, 16, dst);
2107 rtm->rtm_dst_len = 128;
2108 } else if (rtm->rtm_dst_len)
2109 NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
2110 #ifdef CONFIG_IPV6_SUBTREES
2112 NLA_PUT(skb, RTA_SRC, 16, src);
2113 rtm->rtm_src_len = 128;
2114 } else if (rtm->rtm_src_len)
2115 NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
2118 NLA_PUT_U32(skb, RTA_IIF, iif);
2120 struct in6_addr saddr_buf;
2121 if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
2122 NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
2125 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
2126 goto nla_put_failure;
2128 if (rt->u.dst.neighbour)
2129 NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);
2132 NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex);
2134 NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric);
2136 expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0;
2137 if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0,
2138 expires, rt->u.dst.error) < 0)
2139 goto nla_put_failure;
2141 return nlmsg_end(skb, nlh);
2144 nlmsg_cancel(skb, nlh);
2148 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2150 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2153 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2154 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2155 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2159 return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2160 NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
2161 prefix, NLM_F_MULTI);
2164 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
2166 struct nlattr *tb[RTA_MAX+1];
2167 struct rt6_info *rt;
2168 struct sk_buff *skb;
2173 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2178 memset(&fl, 0, sizeof(fl));
2181 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2184 ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC]));
2188 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2191 ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST]));
2195 iif = nla_get_u32(tb[RTA_IIF]);
2198 fl.oif = nla_get_u32(tb[RTA_OIF]);
2201 struct net_device *dev;
2202 dev = __dev_get_by_index(&init_net, iif);
2209 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2215 /* Reserve room for dummy headers, this skb can pass
2216 through good chunk of routing engine.
2218 skb_reset_mac_header(skb);
2219 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2221 rt = (struct rt6_info*) ip6_route_output(NULL, &fl);
2222 skb->dst = &rt->u.dst;
2224 err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
2225 RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2226 nlh->nlmsg_seq, 0, 0);
2232 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
2237 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2239 struct sk_buff *skb;
2240 u32 pid = 0, seq = 0;
2241 struct nlmsghdr *nlh = NULL;
2248 seq = nlh->nlmsg_seq;
2251 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2255 err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0);
2257 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2258 WARN_ON(err == -EMSGSIZE);
2262 err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any());
2265 rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err);
2272 #ifdef CONFIG_PROC_FS
2274 #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1)
2285 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2287 struct seq_file *m = p_arg;
2289 seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr),
2292 #ifdef CONFIG_IPV6_SUBTREES
2293 seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr),
2296 seq_puts(m, "00000000000000000000000000000000 00 ");
2299 if (rt->rt6i_nexthop) {
2300 seq_printf(m, NIP6_SEQFMT,
2301 NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key)));
2303 seq_puts(m, "00000000000000000000000000000000");
2305 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2306 rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
2307 rt->u.dst.__use, rt->rt6i_flags,
2308 rt->rt6i_dev ? rt->rt6i_dev->name : "");
2312 static int ipv6_route_show(struct seq_file *m, void *v)
2314 fib6_clean_all(rt6_info_route, 0, m);
2318 static int ipv6_route_open(struct inode *inode, struct file *file)
2320 return single_open(file, ipv6_route_show, NULL);
2323 static const struct file_operations ipv6_route_proc_fops = {
2324 .owner = THIS_MODULE,
2325 .open = ipv6_route_open,
2327 .llseek = seq_lseek,
2328 .release = single_release,
2331 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2333 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2334 rt6_stats.fib_nodes, rt6_stats.fib_route_nodes,
2335 rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries,
2336 rt6_stats.fib_rt_cache,
2337 atomic_read(&ip6_dst_ops.entries),
2338 rt6_stats.fib_discarded_routes);
2343 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2345 return single_open(file, rt6_stats_seq_show, NULL);
2348 static const struct file_operations rt6_stats_seq_fops = {
2349 .owner = THIS_MODULE,
2350 .open = rt6_stats_seq_open,
2352 .llseek = seq_lseek,
2353 .release = single_release,
2355 #endif /* CONFIG_PROC_FS */
2357 #ifdef CONFIG_SYSCTL
2359 static int flush_delay;
2362 int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
2363 void __user *buffer, size_t *lenp, loff_t *ppos)
2366 proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
2367 fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay);
2373 ctl_table ipv6_route_table[] = {
2375 .procname = "flush",
2376 .data = &flush_delay,
2377 .maxlen = sizeof(int),
2379 .proc_handler = &ipv6_sysctl_rtcache_flush
2382 .ctl_name = NET_IPV6_ROUTE_GC_THRESH,
2383 .procname = "gc_thresh",
2384 .data = &ip6_dst_ops.gc_thresh,
2385 .maxlen = sizeof(int),
2387 .proc_handler = &proc_dointvec,
2390 .ctl_name = NET_IPV6_ROUTE_MAX_SIZE,
2391 .procname = "max_size",
2392 .data = &ip6_rt_max_size,
2393 .maxlen = sizeof(int),
2395 .proc_handler = &proc_dointvec,
2398 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL,
2399 .procname = "gc_min_interval",
2400 .data = &ip6_rt_gc_min_interval,
2401 .maxlen = sizeof(int),
2403 .proc_handler = &proc_dointvec_jiffies,
2404 .strategy = &sysctl_jiffies,
2407 .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT,
2408 .procname = "gc_timeout",
2409 .data = &ip6_rt_gc_timeout,
2410 .maxlen = sizeof(int),
2412 .proc_handler = &proc_dointvec_jiffies,
2413 .strategy = &sysctl_jiffies,
2416 .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL,
2417 .procname = "gc_interval",
2418 .data = &ip6_rt_gc_interval,
2419 .maxlen = sizeof(int),
2421 .proc_handler = &proc_dointvec_jiffies,
2422 .strategy = &sysctl_jiffies,
2425 .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY,
2426 .procname = "gc_elasticity",
2427 .data = &ip6_rt_gc_elasticity,
2428 .maxlen = sizeof(int),
2430 .proc_handler = &proc_dointvec_jiffies,
2431 .strategy = &sysctl_jiffies,
2434 .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES,
2435 .procname = "mtu_expires",
2436 .data = &ip6_rt_mtu_expires,
2437 .maxlen = sizeof(int),
2439 .proc_handler = &proc_dointvec_jiffies,
2440 .strategy = &sysctl_jiffies,
2443 .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS,
2444 .procname = "min_adv_mss",
2445 .data = &ip6_rt_min_advmss,
2446 .maxlen = sizeof(int),
2448 .proc_handler = &proc_dointvec_jiffies,
2449 .strategy = &sysctl_jiffies,
2452 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
2453 .procname = "gc_min_interval_ms",
2454 .data = &ip6_rt_gc_min_interval,
2455 .maxlen = sizeof(int),
2457 .proc_handler = &proc_dointvec_ms_jiffies,
2458 .strategy = &sysctl_ms_jiffies,
2465 void __init ip6_route_init(void)
2467 ip6_dst_ops.kmem_cachep =
2468 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
2469 SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
2470 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep;
2473 proc_net_fops_create(&init_net, "ipv6_route", 0, &ipv6_route_proc_fops);
2474 proc_net_fops_create(&init_net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
2478 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2482 __rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL);
2483 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL);
2484 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL);
2487 void ip6_route_cleanup(void)
2489 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2490 fib6_rules_cleanup();
2492 #ifdef CONFIG_PROC_FS
2493 proc_net_remove(&init_net, "ipv6_route");
2494 proc_net_remove(&init_net, "rt6_stats");
2501 kmem_cache_destroy(ip6_dst_ops.kmem_cachep);