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>
58 #include <net/netevent.h>
59 #include <net/netlink.h>
60 #include <net/nexthop.h>
62 #include <asm/uaccess.h>
65 #include <linux/sysctl.h>
69 RT6_NUD_FAIL_HARD = -2,
70 RT6_NUD_FAIL_SOFT = -1,
74 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
75 const struct in6_addr *dest);
76 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
77 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
78 static unsigned int ip6_mtu(const struct dst_entry *dst);
79 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
80 static void ip6_dst_destroy(struct dst_entry *);
81 static void ip6_dst_ifdown(struct dst_entry *,
82 struct net_device *dev, int how);
83 static int ip6_dst_gc(struct dst_ops *ops);
85 static int ip6_pkt_discard(struct sk_buff *skb);
86 static int ip6_pkt_discard_out(struct sk_buff *skb);
87 static int ip6_pkt_prohibit(struct sk_buff *skb);
88 static int ip6_pkt_prohibit_out(struct sk_buff *skb);
89 static void ip6_link_failure(struct sk_buff *skb);
90 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
91 struct sk_buff *skb, u32 mtu);
92 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
95 #ifdef CONFIG_IPV6_ROUTE_INFO
96 static struct rt6_info *rt6_add_route_info(struct net_device *dev,
97 const struct in6_addr *prefix, int prefixlen,
98 const struct in6_addr *gwaddr, unsigned int pref);
99 static struct rt6_info *rt6_get_route_info(struct net_device *dev,
100 const struct in6_addr *prefix, int prefixlen,
101 const struct in6_addr *gwaddr);
104 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
106 struct rt6_info *rt = (struct rt6_info *) dst;
107 struct inet_peer *peer;
110 if (!(rt->dst.flags & DST_HOST))
113 peer = rt6_get_peer_create(rt);
115 u32 *old_p = __DST_METRICS_PTR(old);
116 unsigned long prev, new;
119 if (inet_metrics_new(peer))
120 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
122 new = (unsigned long) p;
123 prev = cmpxchg(&dst->_metrics, old, new);
126 p = __DST_METRICS_PTR(prev);
127 if (prev & DST_METRICS_READ_ONLY)
134 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
138 struct in6_addr *p = &rt->rt6i_gateway;
140 if (!ipv6_addr_any(p))
141 return (const void *) p;
143 return &ipv6_hdr(skb)->daddr;
147 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
151 struct rt6_info *rt = (struct rt6_info *) dst;
154 daddr = choose_neigh_daddr(rt, skb, daddr);
155 n = __ipv6_neigh_lookup(dst->dev, daddr);
158 return neigh_create(&nd_tbl, daddr, dst->dev);
161 static struct dst_ops ip6_dst_ops_template = {
163 .protocol = cpu_to_be16(ETH_P_IPV6),
166 .check = ip6_dst_check,
167 .default_advmss = ip6_default_advmss,
169 .cow_metrics = ipv6_cow_metrics,
170 .destroy = ip6_dst_destroy,
171 .ifdown = ip6_dst_ifdown,
172 .negative_advice = ip6_negative_advice,
173 .link_failure = ip6_link_failure,
174 .update_pmtu = ip6_rt_update_pmtu,
175 .redirect = rt6_do_redirect,
176 .local_out = __ip6_local_out,
177 .neigh_lookup = ip6_neigh_lookup,
180 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
182 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
184 return mtu ? : dst->dev->mtu;
187 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
188 struct sk_buff *skb, u32 mtu)
192 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
197 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
203 static struct dst_ops ip6_dst_blackhole_ops = {
205 .protocol = cpu_to_be16(ETH_P_IPV6),
206 .destroy = ip6_dst_destroy,
207 .check = ip6_dst_check,
208 .mtu = ip6_blackhole_mtu,
209 .default_advmss = ip6_default_advmss,
210 .update_pmtu = ip6_rt_blackhole_update_pmtu,
211 .redirect = ip6_rt_blackhole_redirect,
212 .cow_metrics = ip6_rt_blackhole_cow_metrics,
213 .neigh_lookup = ip6_neigh_lookup,
216 static const u32 ip6_template_metrics[RTAX_MAX] = {
217 [RTAX_HOPLIMIT - 1] = 0,
220 static const struct rt6_info ip6_null_entry_template = {
222 .__refcnt = ATOMIC_INIT(1),
224 .obsolete = DST_OBSOLETE_FORCE_CHK,
225 .error = -ENETUNREACH,
226 .input = ip6_pkt_discard,
227 .output = ip6_pkt_discard_out,
229 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
230 .rt6i_protocol = RTPROT_KERNEL,
231 .rt6i_metric = ~(u32) 0,
232 .rt6i_ref = ATOMIC_INIT(1),
235 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
237 static const struct rt6_info ip6_prohibit_entry_template = {
239 .__refcnt = ATOMIC_INIT(1),
241 .obsolete = DST_OBSOLETE_FORCE_CHK,
243 .input = ip6_pkt_prohibit,
244 .output = ip6_pkt_prohibit_out,
246 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
247 .rt6i_protocol = RTPROT_KERNEL,
248 .rt6i_metric = ~(u32) 0,
249 .rt6i_ref = ATOMIC_INIT(1),
252 static const struct rt6_info ip6_blk_hole_entry_template = {
254 .__refcnt = ATOMIC_INIT(1),
256 .obsolete = DST_OBSOLETE_FORCE_CHK,
258 .input = dst_discard,
259 .output = dst_discard,
261 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
262 .rt6i_protocol = RTPROT_KERNEL,
263 .rt6i_metric = ~(u32) 0,
264 .rt6i_ref = ATOMIC_INIT(1),
269 /* allocate dst with ip6_dst_ops */
270 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
271 struct net_device *dev,
273 struct fib6_table *table)
275 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
276 0, DST_OBSOLETE_FORCE_CHK, flags);
279 struct dst_entry *dst = &rt->dst;
281 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
282 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
283 rt->rt6i_genid = rt_genid(net);
284 INIT_LIST_HEAD(&rt->rt6i_siblings);
285 rt->rt6i_nsiblings = 0;
290 static void ip6_dst_destroy(struct dst_entry *dst)
292 struct rt6_info *rt = (struct rt6_info *)dst;
293 struct inet6_dev *idev = rt->rt6i_idev;
294 struct dst_entry *from = dst->from;
296 if (!(rt->dst.flags & DST_HOST))
297 dst_destroy_metrics_generic(dst);
300 rt->rt6i_idev = NULL;
307 if (rt6_has_peer(rt)) {
308 struct inet_peer *peer = rt6_peer_ptr(rt);
313 void rt6_bind_peer(struct rt6_info *rt, int create)
315 struct inet_peer_base *base;
316 struct inet_peer *peer;
318 base = inetpeer_base_ptr(rt->_rt6i_peer);
322 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
324 if (!rt6_set_peer(rt, peer))
329 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
332 struct rt6_info *rt = (struct rt6_info *)dst;
333 struct inet6_dev *idev = rt->rt6i_idev;
334 struct net_device *loopback_dev =
335 dev_net(dev)->loopback_dev;
337 if (dev != loopback_dev) {
338 if (idev && idev->dev == dev) {
339 struct inet6_dev *loopback_idev =
340 in6_dev_get(loopback_dev);
342 rt->rt6i_idev = loopback_idev;
349 static bool rt6_check_expired(const struct rt6_info *rt)
351 if (rt->rt6i_flags & RTF_EXPIRES) {
352 if (time_after(jiffies, rt->dst.expires))
354 } else if (rt->dst.from) {
355 return rt6_check_expired((struct rt6_info *) rt->dst.from);
360 static bool rt6_need_strict(const struct in6_addr *daddr)
362 return ipv6_addr_type(daddr) &
363 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
366 /* Multipath route selection:
367 * Hash based function using packet header and flowlabel.
368 * Adapted from fib_info_hashfn()
370 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
371 const struct flowi6 *fl6)
373 unsigned int val = fl6->flowi6_proto;
375 val ^= ipv6_addr_hash(&fl6->daddr);
376 val ^= ipv6_addr_hash(&fl6->saddr);
378 /* Work only if this not encapsulated */
379 switch (fl6->flowi6_proto) {
383 val ^= (__force u16)fl6->fl6_sport;
384 val ^= (__force u16)fl6->fl6_dport;
388 val ^= (__force u16)fl6->fl6_icmp_type;
389 val ^= (__force u16)fl6->fl6_icmp_code;
392 /* RFC6438 recommands to use flowlabel */
393 val ^= (__force u32)fl6->flowlabel;
395 /* Perhaps, we need to tune, this function? */
396 val = val ^ (val >> 7) ^ (val >> 12);
397 return val % candidate_count;
400 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
403 struct rt6_info *sibling, *next_sibling;
406 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
407 /* Don't change the route, if route_choosen == 0
408 * (siblings does not include ourself)
411 list_for_each_entry_safe(sibling, next_sibling,
412 &match->rt6i_siblings, rt6i_siblings) {
414 if (route_choosen == 0) {
423 * Route lookup. Any table->tb6_lock is implied.
426 static inline struct rt6_info *rt6_device_match(struct net *net,
428 const struct in6_addr *saddr,
432 struct rt6_info *local = NULL;
433 struct rt6_info *sprt;
435 if (!oif && ipv6_addr_any(saddr))
438 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
439 struct net_device *dev = sprt->dst.dev;
442 if (dev->ifindex == oif)
444 if (dev->flags & IFF_LOOPBACK) {
445 if (!sprt->rt6i_idev ||
446 sprt->rt6i_idev->dev->ifindex != oif) {
447 if (flags & RT6_LOOKUP_F_IFACE && oif)
449 if (local && (!oif ||
450 local->rt6i_idev->dev->ifindex == oif))
456 if (ipv6_chk_addr(net, saddr, dev,
457 flags & RT6_LOOKUP_F_IFACE))
466 if (flags & RT6_LOOKUP_F_IFACE)
467 return net->ipv6.ip6_null_entry;
473 #ifdef CONFIG_IPV6_ROUTER_PREF
474 struct __rt6_probe_work {
475 struct work_struct work;
476 struct in6_addr target;
477 struct net_device *dev;
480 static void rt6_probe_deferred(struct work_struct *w)
482 struct in6_addr mcaddr;
483 struct __rt6_probe_work *work =
484 container_of(w, struct __rt6_probe_work, work);
486 addrconf_addr_solict_mult(&work->target, &mcaddr);
487 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
492 static void rt6_probe(struct rt6_info *rt)
494 struct neighbour *neigh;
496 * Okay, this does not seem to be appropriate
497 * for now, however, we need to check if it
498 * is really so; aka Router Reachability Probing.
500 * Router Reachability Probe MUST be rate-limited
501 * to no more than one per minute.
503 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
506 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
508 write_lock(&neigh->lock);
509 if (neigh->nud_state & NUD_VALID)
514 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
515 struct __rt6_probe_work *work;
517 work = kmalloc(sizeof(*work), GFP_ATOMIC);
520 neigh->updated = jiffies;
523 write_unlock(&neigh->lock);
526 INIT_WORK(&work->work, rt6_probe_deferred);
527 work->target = rt->rt6i_gateway;
528 dev_hold(rt->dst.dev);
529 work->dev = rt->dst.dev;
530 schedule_work(&work->work);
534 write_unlock(&neigh->lock);
536 rcu_read_unlock_bh();
539 static inline void rt6_probe(struct rt6_info *rt)
545 * Default Router Selection (RFC 2461 6.3.6)
547 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
549 struct net_device *dev = rt->dst.dev;
550 if (!oif || dev->ifindex == oif)
552 if ((dev->flags & IFF_LOOPBACK) &&
553 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
558 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
560 struct neighbour *neigh;
561 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
563 if (rt->rt6i_flags & RTF_NONEXTHOP ||
564 !(rt->rt6i_flags & RTF_GATEWAY))
565 return RT6_NUD_SUCCEED;
568 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
570 read_lock(&neigh->lock);
571 if (neigh->nud_state & NUD_VALID)
572 ret = RT6_NUD_SUCCEED;
573 #ifdef CONFIG_IPV6_ROUTER_PREF
574 else if (!(neigh->nud_state & NUD_FAILED))
575 ret = RT6_NUD_SUCCEED;
577 read_unlock(&neigh->lock);
579 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
580 RT6_NUD_SUCCEED : RT6_NUD_FAIL_SOFT;
582 rcu_read_unlock_bh();
587 static int rt6_score_route(struct rt6_info *rt, int oif,
592 m = rt6_check_dev(rt, oif);
593 if (!m && (strict & RT6_LOOKUP_F_IFACE))
594 return RT6_NUD_FAIL_HARD;
595 #ifdef CONFIG_IPV6_ROUTER_PREF
596 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
598 if (strict & RT6_LOOKUP_F_REACHABLE) {
599 int n = rt6_check_neigh(rt);
606 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
607 int *mpri, struct rt6_info *match,
611 bool match_do_rr = false;
613 if (rt6_check_expired(rt))
616 m = rt6_score_route(rt, oif, strict);
617 if (m == RT6_NUD_FAIL_SOFT && !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF)) {
619 m = 0; /* lowest valid score */
624 if (strict & RT6_LOOKUP_F_REACHABLE)
628 *do_rr = match_do_rr;
636 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
637 struct rt6_info *rr_head,
638 u32 metric, int oif, int strict,
641 struct rt6_info *rt, *match;
645 for (rt = rr_head; rt && rt->rt6i_metric == metric;
646 rt = rt->dst.rt6_next)
647 match = find_match(rt, oif, strict, &mpri, match, do_rr);
648 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
649 rt = rt->dst.rt6_next)
650 match = find_match(rt, oif, strict, &mpri, match, do_rr);
655 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
657 struct rt6_info *match, *rt0;
663 fn->rr_ptr = rt0 = fn->leaf;
665 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
669 struct rt6_info *next = rt0->dst.rt6_next;
671 /* no entries matched; do round-robin */
672 if (!next || next->rt6i_metric != rt0->rt6i_metric)
679 net = dev_net(rt0->dst.dev);
680 return match ? match : net->ipv6.ip6_null_entry;
683 #ifdef CONFIG_IPV6_ROUTE_INFO
684 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
685 const struct in6_addr *gwaddr)
687 struct route_info *rinfo = (struct route_info *) opt;
688 struct in6_addr prefix_buf, *prefix;
690 unsigned long lifetime;
693 if (len < sizeof(struct route_info)) {
697 /* Sanity check for prefix_len and length */
698 if (rinfo->length > 3) {
700 } else if (rinfo->prefix_len > 128) {
702 } else if (rinfo->prefix_len > 64) {
703 if (rinfo->length < 2) {
706 } else if (rinfo->prefix_len > 0) {
707 if (rinfo->length < 1) {
712 pref = rinfo->route_pref;
713 if (pref == ICMPV6_ROUTER_PREF_INVALID)
716 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
718 if (rinfo->length == 3)
719 prefix = (struct in6_addr *)rinfo->prefix;
721 /* this function is safe */
722 ipv6_addr_prefix(&prefix_buf,
723 (struct in6_addr *)rinfo->prefix,
725 prefix = &prefix_buf;
728 if (rinfo->prefix_len == 0)
729 rt = rt6_get_dflt_router(gwaddr, dev);
731 rt = rt6_get_route_info(dev, prefix, rinfo->prefix_len, gwaddr);
733 if (rt && !lifetime) {
739 rt = rt6_add_route_info(dev, prefix, rinfo->prefix_len, gwaddr, pref);
741 rt->rt6i_flags = RTF_ROUTEINFO |
742 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
745 if (!addrconf_finite_timeout(lifetime))
746 rt6_clean_expires(rt);
748 rt6_set_expires(rt, jiffies + HZ * lifetime);
756 #define BACKTRACK(__net, saddr) \
758 if (rt == __net->ipv6.ip6_null_entry) { \
759 struct fib6_node *pn; \
761 if (fn->fn_flags & RTN_TL_ROOT) \
764 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
765 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
768 if (fn->fn_flags & RTN_RTINFO) \
774 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
775 struct fib6_table *table,
776 struct flowi6 *fl6, int flags)
778 struct fib6_node *fn;
781 read_lock_bh(&table->tb6_lock);
782 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
785 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
786 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
787 rt = rt6_multipath_select(rt, fl6);
788 BACKTRACK(net, &fl6->saddr);
790 dst_use(&rt->dst, jiffies);
791 read_unlock_bh(&table->tb6_lock);
796 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
799 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
801 EXPORT_SYMBOL_GPL(ip6_route_lookup);
803 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
804 const struct in6_addr *saddr, int oif, int strict)
806 struct flowi6 fl6 = {
810 struct dst_entry *dst;
811 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
814 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
815 flags |= RT6_LOOKUP_F_HAS_SADDR;
818 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
820 return (struct rt6_info *) dst;
827 EXPORT_SYMBOL(rt6_lookup);
829 /* ip6_ins_rt is called with FREE table->tb6_lock.
830 It takes new route entry, the addition fails by any reason the
831 route is freed. In any case, if caller does not hold it, it may
835 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
838 struct fib6_table *table;
840 table = rt->rt6i_table;
841 write_lock_bh(&table->tb6_lock);
842 err = fib6_add(&table->tb6_root, rt, info);
843 write_unlock_bh(&table->tb6_lock);
848 int ip6_ins_rt(struct rt6_info *rt)
850 struct nl_info info = {
851 .nl_net = dev_net(rt->dst.dev),
853 return __ip6_ins_rt(rt, &info);
856 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
857 const struct in6_addr *daddr,
858 const struct in6_addr *saddr)
866 rt = ip6_rt_copy(ort, daddr);
869 if (!(rt->rt6i_flags & RTF_GATEWAY)) {
870 if (ort->rt6i_dst.plen != 128 &&
871 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
872 rt->rt6i_flags |= RTF_ANYCAST;
875 rt->rt6i_flags |= RTF_CACHE;
877 #ifdef CONFIG_IPV6_SUBTREES
878 if (rt->rt6i_src.plen && saddr) {
879 rt->rt6i_src.addr = *saddr;
880 rt->rt6i_src.plen = 128;
888 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
889 const struct in6_addr *daddr)
891 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
894 rt->rt6i_flags |= RTF_CACHE;
898 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
899 struct flowi6 *fl6, int flags)
901 struct fib6_node *fn;
902 struct rt6_info *rt, *nrt;
906 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
908 strict |= flags & RT6_LOOKUP_F_IFACE;
911 read_lock_bh(&table->tb6_lock);
914 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
917 rt = rt6_select(fn, oif, strict | reachable);
918 if (rt->rt6i_nsiblings && oif == 0)
919 rt = rt6_multipath_select(rt, fl6);
920 BACKTRACK(net, &fl6->saddr);
921 if (rt == net->ipv6.ip6_null_entry ||
922 rt->rt6i_flags & RTF_CACHE)
926 read_unlock_bh(&table->tb6_lock);
928 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
929 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
930 else if (!(rt->dst.flags & DST_HOST))
931 nrt = rt6_alloc_clone(rt, &fl6->daddr);
936 rt = nrt ? : net->ipv6.ip6_null_entry;
940 err = ip6_ins_rt(nrt);
949 * Race condition! In the gap, when table->tb6_lock was
950 * released someone could insert this route. Relookup.
961 read_unlock_bh(&table->tb6_lock);
963 rt->dst.lastuse = jiffies;
969 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
970 struct flowi6 *fl6, int flags)
972 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
975 static struct dst_entry *ip6_route_input_lookup(struct net *net,
976 struct net_device *dev,
977 struct flowi6 *fl6, int flags)
979 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
980 flags |= RT6_LOOKUP_F_IFACE;
982 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
985 void ip6_route_input(struct sk_buff *skb)
987 const struct ipv6hdr *iph = ipv6_hdr(skb);
988 struct net *net = dev_net(skb->dev);
989 int flags = RT6_LOOKUP_F_HAS_SADDR;
990 struct flowi6 fl6 = {
991 .flowi6_iif = skb->dev->ifindex,
994 .flowlabel = ip6_flowinfo(iph),
995 .flowi6_mark = skb->mark,
996 .flowi6_proto = iph->nexthdr,
999 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1002 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1003 struct flowi6 *fl6, int flags)
1005 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1008 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
1013 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1015 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1016 flags |= RT6_LOOKUP_F_IFACE;
1018 if (!ipv6_addr_any(&fl6->saddr))
1019 flags |= RT6_LOOKUP_F_HAS_SADDR;
1021 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1023 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1026 EXPORT_SYMBOL(ip6_route_output);
1028 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1030 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1031 struct dst_entry *new = NULL;
1033 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1037 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1038 rt6_init_peer(rt, net->ipv6.peers);
1041 new->input = dst_discard;
1042 new->output = dst_discard;
1044 if (dst_metrics_read_only(&ort->dst))
1045 new->_metrics = ort->dst._metrics;
1047 dst_copy_metrics(new, &ort->dst);
1048 rt->rt6i_idev = ort->rt6i_idev;
1050 in6_dev_hold(rt->rt6i_idev);
1052 rt->rt6i_gateway = ort->rt6i_gateway;
1053 rt->rt6i_flags = ort->rt6i_flags;
1054 rt->rt6i_metric = 0;
1056 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1057 #ifdef CONFIG_IPV6_SUBTREES
1058 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1064 dst_release(dst_orig);
1065 return new ? new : ERR_PTR(-ENOMEM);
1069 * Destination cache support functions
1072 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1074 struct rt6_info *rt;
1076 rt = (struct rt6_info *) dst;
1078 /* All IPV6 dsts are created with ->obsolete set to the value
1079 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1080 * into this function always.
1082 if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev)))
1085 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1088 if (rt6_check_expired(rt))
1094 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1096 struct rt6_info *rt = (struct rt6_info *) dst;
1099 if (rt->rt6i_flags & RTF_CACHE) {
1100 if (rt6_check_expired(rt)) {
1112 static void ip6_link_failure(struct sk_buff *skb)
1114 struct rt6_info *rt;
1116 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1118 rt = (struct rt6_info *) skb_dst(skb);
1120 if (rt->rt6i_flags & RTF_CACHE) {
1124 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1125 rt->rt6i_node->fn_sernum = -1;
1130 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1131 struct sk_buff *skb, u32 mtu)
1133 struct rt6_info *rt6 = (struct rt6_info*)dst;
1136 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1137 struct net *net = dev_net(dst->dev);
1139 rt6->rt6i_flags |= RTF_MODIFIED;
1140 if (mtu < IPV6_MIN_MTU) {
1141 u32 features = dst_metric(dst, RTAX_FEATURES);
1143 features |= RTAX_FEATURE_ALLFRAG;
1144 dst_metric_set(dst, RTAX_FEATURES, features);
1146 dst_metric_set(dst, RTAX_MTU, mtu);
1147 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1151 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1152 int oif, u32 mark, kuid_t uid)
1154 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1155 struct dst_entry *dst;
1158 memset(&fl6, 0, sizeof(fl6));
1159 fl6.flowi6_oif = oif;
1160 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1161 fl6.flowi6_flags = 0;
1162 fl6.daddr = iph->daddr;
1163 fl6.saddr = iph->saddr;
1164 fl6.flowlabel = ip6_flowinfo(iph);
1165 fl6.flowi6_uid = uid;
1167 dst = ip6_route_output(net, NULL, &fl6);
1169 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1172 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1174 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1176 ip6_update_pmtu(skb, sock_net(sk), mtu,
1177 sk->sk_bound_dev_if, sk->sk_mark, sock_i_uid(sk));
1179 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1181 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1183 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1184 struct dst_entry *dst;
1187 memset(&fl6, 0, sizeof(fl6));
1188 fl6.flowi6_oif = oif;
1189 fl6.flowi6_mark = mark;
1190 fl6.flowi6_flags = 0;
1191 fl6.daddr = iph->daddr;
1192 fl6.saddr = iph->saddr;
1193 fl6.flowlabel = ip6_flowinfo(iph);
1195 dst = ip6_route_output(net, NULL, &fl6);
1197 rt6_do_redirect(dst, NULL, skb);
1200 EXPORT_SYMBOL_GPL(ip6_redirect);
1202 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1204 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1206 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1208 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1210 struct net_device *dev = dst->dev;
1211 unsigned int mtu = dst_mtu(dst);
1212 struct net *net = dev_net(dev);
1214 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1216 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1217 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1220 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1221 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1222 * IPV6_MAXPLEN is also valid and means: "any MSS,
1223 * rely only on pmtu discovery"
1225 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1230 static unsigned int ip6_mtu(const struct dst_entry *dst)
1232 struct inet6_dev *idev;
1233 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1241 idev = __in6_dev_get(dst->dev);
1243 mtu = idev->cnf.mtu6;
1247 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1250 static struct dst_entry *icmp6_dst_gc_list;
1251 static DEFINE_SPINLOCK(icmp6_dst_lock);
1253 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1256 struct dst_entry *dst;
1257 struct rt6_info *rt;
1258 struct inet6_dev *idev = in6_dev_get(dev);
1259 struct net *net = dev_net(dev);
1261 if (unlikely(!idev))
1262 return ERR_PTR(-ENODEV);
1264 rt = ip6_dst_alloc(net, dev, 0, NULL);
1265 if (unlikely(!rt)) {
1267 dst = ERR_PTR(-ENOMEM);
1271 rt->dst.flags |= DST_HOST;
1272 rt->dst.output = ip6_output;
1273 atomic_set(&rt->dst.__refcnt, 1);
1274 rt->rt6i_gateway = fl6->daddr;
1275 rt->rt6i_dst.addr = fl6->daddr;
1276 rt->rt6i_dst.plen = 128;
1277 rt->rt6i_idev = idev;
1278 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1280 spin_lock_bh(&icmp6_dst_lock);
1281 rt->dst.next = icmp6_dst_gc_list;
1282 icmp6_dst_gc_list = &rt->dst;
1283 spin_unlock_bh(&icmp6_dst_lock);
1285 fib6_force_start_gc(net);
1287 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1293 int icmp6_dst_gc(void)
1295 struct dst_entry *dst, **pprev;
1298 spin_lock_bh(&icmp6_dst_lock);
1299 pprev = &icmp6_dst_gc_list;
1301 while ((dst = *pprev) != NULL) {
1302 if (!atomic_read(&dst->__refcnt)) {
1311 spin_unlock_bh(&icmp6_dst_lock);
1316 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1319 struct dst_entry *dst, **pprev;
1321 spin_lock_bh(&icmp6_dst_lock);
1322 pprev = &icmp6_dst_gc_list;
1323 while ((dst = *pprev) != NULL) {
1324 struct rt6_info *rt = (struct rt6_info *) dst;
1325 if (func(rt, arg)) {
1332 spin_unlock_bh(&icmp6_dst_lock);
1335 static int ip6_dst_gc(struct dst_ops *ops)
1337 unsigned long now = jiffies;
1338 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1339 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1340 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1341 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1342 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1343 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1346 entries = dst_entries_get_fast(ops);
1347 if (time_after(rt_last_gc + rt_min_interval, now) &&
1348 entries <= rt_max_size)
1351 net->ipv6.ip6_rt_gc_expire++;
1352 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net);
1353 net->ipv6.ip6_rt_last_gc = now;
1354 entries = dst_entries_get_slow(ops);
1355 if (entries < ops->gc_thresh)
1356 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1358 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1359 return entries > rt_max_size;
1362 int ip6_dst_hoplimit(struct dst_entry *dst)
1364 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
1365 if (hoplimit == 0) {
1366 struct net_device *dev = dst->dev;
1367 struct inet6_dev *idev;
1370 idev = __in6_dev_get(dev);
1372 hoplimit = idev->cnf.hop_limit;
1374 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
1379 EXPORT_SYMBOL(ip6_dst_hoplimit);
1385 int ip6_route_add(struct fib6_config *cfg)
1388 struct net *net = cfg->fc_nlinfo.nl_net;
1389 struct rt6_info *rt = NULL;
1390 struct net_device *dev = NULL;
1391 struct inet6_dev *idev = NULL;
1392 struct fib6_table *table;
1395 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1397 #ifndef CONFIG_IPV6_SUBTREES
1398 if (cfg->fc_src_len)
1401 if (cfg->fc_ifindex) {
1403 dev = dev_get_by_index(net, cfg->fc_ifindex);
1406 idev = in6_dev_get(dev);
1411 if (cfg->fc_metric == 0)
1412 cfg->fc_metric = IP6_RT_PRIO_USER;
1415 if (cfg->fc_nlinfo.nlh &&
1416 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1417 table = fib6_get_table(net, cfg->fc_table);
1419 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1420 table = fib6_new_table(net, cfg->fc_table);
1423 table = fib6_new_table(net, cfg->fc_table);
1429 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1436 if (cfg->fc_flags & RTF_EXPIRES)
1437 rt6_set_expires(rt, jiffies +
1438 clock_t_to_jiffies(cfg->fc_expires));
1440 rt6_clean_expires(rt);
1442 if (cfg->fc_protocol == RTPROT_UNSPEC)
1443 cfg->fc_protocol = RTPROT_BOOT;
1444 rt->rt6i_protocol = cfg->fc_protocol;
1446 addr_type = ipv6_addr_type(&cfg->fc_dst);
1448 if (addr_type & IPV6_ADDR_MULTICAST)
1449 rt->dst.input = ip6_mc_input;
1450 else if (cfg->fc_flags & RTF_LOCAL)
1451 rt->dst.input = ip6_input;
1453 rt->dst.input = ip6_forward;
1455 rt->dst.output = ip6_output;
1457 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1458 rt->rt6i_dst.plen = cfg->fc_dst_len;
1459 if (rt->rt6i_dst.plen == 128)
1460 rt->dst.flags |= DST_HOST;
1462 if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
1463 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1468 dst_init_metrics(&rt->dst, metrics, 0);
1470 #ifdef CONFIG_IPV6_SUBTREES
1471 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1472 rt->rt6i_src.plen = cfg->fc_src_len;
1475 rt->rt6i_metric = cfg->fc_metric;
1477 /* We cannot add true routes via loopback here,
1478 they would result in kernel looping; promote them to reject routes
1480 if ((cfg->fc_flags & RTF_REJECT) ||
1481 (dev && (dev->flags & IFF_LOOPBACK) &&
1482 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1483 !(cfg->fc_flags & RTF_LOCAL))) {
1484 /* hold loopback dev/idev if we haven't done so. */
1485 if (dev != net->loopback_dev) {
1490 dev = net->loopback_dev;
1492 idev = in6_dev_get(dev);
1498 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1499 switch (cfg->fc_type) {
1501 rt->dst.error = -EINVAL;
1502 rt->dst.output = dst_discard;
1503 rt->dst.input = dst_discard;
1506 rt->dst.error = -EACCES;
1507 rt->dst.output = ip6_pkt_prohibit_out;
1508 rt->dst.input = ip6_pkt_prohibit;
1512 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1514 rt->dst.output = ip6_pkt_discard_out;
1515 rt->dst.input = ip6_pkt_discard;
1521 if (cfg->fc_flags & RTF_GATEWAY) {
1522 const struct in6_addr *gw_addr;
1525 gw_addr = &cfg->fc_gateway;
1526 rt->rt6i_gateway = *gw_addr;
1527 gwa_type = ipv6_addr_type(gw_addr);
1529 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1530 struct rt6_info *grt;
1532 /* IPv6 strictly inhibits using not link-local
1533 addresses as nexthop address.
1534 Otherwise, router will not able to send redirects.
1535 It is very good, but in some (rare!) circumstances
1536 (SIT, PtP, NBMA NOARP links) it is handy to allow
1537 some exceptions. --ANK
1540 if (!(gwa_type & IPV6_ADDR_UNICAST))
1543 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1545 err = -EHOSTUNREACH;
1549 if (dev != grt->dst.dev) {
1555 idev = grt->rt6i_idev;
1557 in6_dev_hold(grt->rt6i_idev);
1559 if (!(grt->rt6i_flags & RTF_GATEWAY))
1567 if (!dev || (dev->flags & IFF_LOOPBACK))
1575 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1576 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1580 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1581 rt->rt6i_prefsrc.plen = 128;
1583 rt->rt6i_prefsrc.plen = 0;
1585 rt->rt6i_flags = cfg->fc_flags;
1592 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1593 int type = nla_type(nla);
1596 if (type > RTAX_MAX) {
1601 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1607 rt->rt6i_idev = idev;
1608 rt->rt6i_table = table;
1610 cfg->fc_nlinfo.nl_net = dev_net(dev);
1612 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1624 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1627 struct fib6_table *table;
1628 struct net *net = dev_net(rt->dst.dev);
1630 if (rt == net->ipv6.ip6_null_entry) {
1635 table = rt->rt6i_table;
1636 write_lock_bh(&table->tb6_lock);
1637 err = fib6_del(rt, info);
1638 write_unlock_bh(&table->tb6_lock);
1645 int ip6_del_rt(struct rt6_info *rt)
1647 struct nl_info info = {
1648 .nl_net = dev_net(rt->dst.dev),
1650 return __ip6_del_rt(rt, &info);
1653 static int ip6_route_del(struct fib6_config *cfg)
1655 struct fib6_table *table;
1656 struct fib6_node *fn;
1657 struct rt6_info *rt;
1660 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1664 read_lock_bh(&table->tb6_lock);
1666 fn = fib6_locate(&table->tb6_root,
1667 &cfg->fc_dst, cfg->fc_dst_len,
1668 &cfg->fc_src, cfg->fc_src_len);
1671 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1672 if (cfg->fc_ifindex &&
1674 rt->dst.dev->ifindex != cfg->fc_ifindex))
1676 if (cfg->fc_flags & RTF_GATEWAY &&
1677 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1679 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1682 read_unlock_bh(&table->tb6_lock);
1684 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1687 read_unlock_bh(&table->tb6_lock);
1692 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1694 struct net *net = dev_net(skb->dev);
1695 struct netevent_redirect netevent;
1696 struct rt6_info *rt, *nrt = NULL;
1697 struct ndisc_options ndopts;
1698 struct inet6_dev *in6_dev;
1699 struct neighbour *neigh;
1701 int optlen, on_link;
1704 optlen = skb->tail - skb->transport_header;
1705 optlen -= sizeof(*msg);
1708 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1712 msg = (struct rd_msg *)icmp6_hdr(skb);
1714 if (ipv6_addr_is_multicast(&msg->dest)) {
1715 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1720 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1722 } else if (ipv6_addr_type(&msg->target) !=
1723 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1724 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1728 in6_dev = __in6_dev_get(skb->dev);
1731 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1735 * The IP source address of the Redirect MUST be the same as the current
1736 * first-hop router for the specified ICMP Destination Address.
1739 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1740 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1745 if (ndopts.nd_opts_tgt_lladdr) {
1746 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1749 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1754 rt = (struct rt6_info *) dst;
1755 if (rt == net->ipv6.ip6_null_entry) {
1756 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1760 /* Redirect received -> path was valid.
1761 * Look, redirects are sent only in response to data packets,
1762 * so that this nexthop apparently is reachable. --ANK
1764 dst_confirm(&rt->dst);
1766 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1771 * We have finally decided to accept it.
1774 neigh_update(neigh, lladdr, NUD_STALE,
1775 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1776 NEIGH_UPDATE_F_OVERRIDE|
1777 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1778 NEIGH_UPDATE_F_ISROUTER))
1781 nrt = ip6_rt_copy(rt, &msg->dest);
1785 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1787 nrt->rt6i_flags &= ~RTF_GATEWAY;
1789 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1791 if (ip6_ins_rt(nrt))
1794 netevent.old = &rt->dst;
1795 netevent.new = &nrt->dst;
1796 netevent.daddr = &msg->dest;
1797 netevent.neigh = neigh;
1798 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1800 if (rt->rt6i_flags & RTF_CACHE) {
1801 rt = (struct rt6_info *) dst_clone(&rt->dst);
1806 neigh_release(neigh);
1810 * Misc support functions
1813 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1814 const struct in6_addr *dest)
1816 struct net *net = dev_net(ort->dst.dev);
1817 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1821 rt->dst.input = ort->dst.input;
1822 rt->dst.output = ort->dst.output;
1823 rt->dst.flags |= DST_HOST;
1825 rt->rt6i_dst.addr = *dest;
1826 rt->rt6i_dst.plen = 128;
1827 dst_copy_metrics(&rt->dst, &ort->dst);
1828 rt->dst.error = ort->dst.error;
1829 rt->rt6i_idev = ort->rt6i_idev;
1831 in6_dev_hold(rt->rt6i_idev);
1832 rt->dst.lastuse = jiffies;
1834 if (ort->rt6i_flags & RTF_GATEWAY)
1835 rt->rt6i_gateway = ort->rt6i_gateway;
1837 rt->rt6i_gateway = *dest;
1838 rt->rt6i_flags = ort->rt6i_flags;
1839 rt6_set_from(rt, ort);
1840 rt->rt6i_metric = 0;
1842 #ifdef CONFIG_IPV6_SUBTREES
1843 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1845 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1846 rt->rt6i_table = ort->rt6i_table;
1851 #ifdef CONFIG_IPV6_ROUTE_INFO
1852 static struct rt6_info *rt6_get_route_info(struct net_device *dev,
1853 const struct in6_addr *prefix, int prefixlen,
1854 const struct in6_addr *gwaddr)
1856 struct fib6_node *fn;
1857 struct rt6_info *rt = NULL;
1858 struct fib6_table *table;
1860 table = fib6_get_table(dev_net(dev),
1861 addrconf_rt_table(dev, RT6_TABLE_INFO));
1865 read_lock_bh(&table->tb6_lock);
1866 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1870 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1871 if (rt->dst.dev->ifindex != dev->ifindex)
1873 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1875 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1881 read_unlock_bh(&table->tb6_lock);
1885 static struct rt6_info *rt6_add_route_info(struct net_device *dev,
1886 const struct in6_addr *prefix, int prefixlen,
1887 const struct in6_addr *gwaddr, unsigned int pref)
1889 struct fib6_config cfg = {
1890 .fc_table = addrconf_rt_table(dev, RT6_TABLE_INFO),
1891 .fc_metric = IP6_RT_PRIO_USER,
1892 .fc_ifindex = dev->ifindex,
1893 .fc_dst_len = prefixlen,
1894 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1895 RTF_UP | RTF_PREF(pref),
1896 .fc_nlinfo.portid = 0,
1897 .fc_nlinfo.nlh = NULL,
1898 .fc_nlinfo.nl_net = dev_net(dev),
1901 cfg.fc_dst = *prefix;
1902 cfg.fc_gateway = *gwaddr;
1904 /* We should treat it as a default route if prefix length is 0. */
1906 cfg.fc_flags |= RTF_DEFAULT;
1908 ip6_route_add(&cfg);
1910 return rt6_get_route_info(dev, prefix, prefixlen, gwaddr);
1914 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1916 struct rt6_info *rt;
1917 struct fib6_table *table;
1919 table = fib6_get_table(dev_net(dev),
1920 addrconf_rt_table(dev, RT6_TABLE_MAIN));
1924 read_lock_bh(&table->tb6_lock);
1925 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1926 if (dev == rt->dst.dev &&
1927 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1928 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1933 read_unlock_bh(&table->tb6_lock);
1937 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1938 struct net_device *dev,
1941 struct fib6_config cfg = {
1942 .fc_table = addrconf_rt_table(dev, RT6_TABLE_DFLT),
1943 .fc_metric = IP6_RT_PRIO_USER,
1944 .fc_ifindex = dev->ifindex,
1945 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1946 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1947 .fc_nlinfo.portid = 0,
1948 .fc_nlinfo.nlh = NULL,
1949 .fc_nlinfo.nl_net = dev_net(dev),
1952 cfg.fc_gateway = *gwaddr;
1954 ip6_route_add(&cfg);
1956 return rt6_get_dflt_router(gwaddr, dev);
1960 int rt6_addrconf_purge(struct rt6_info *rt, void *arg) {
1961 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
1962 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2))
1967 void rt6_purge_dflt_routers(struct net *net)
1969 fib6_clean_all(net, rt6_addrconf_purge, 0, NULL);
1972 static void rtmsg_to_fib6_config(struct net *net,
1973 struct in6_rtmsg *rtmsg,
1974 struct fib6_config *cfg)
1976 memset(cfg, 0, sizeof(*cfg));
1978 cfg->fc_table = RT6_TABLE_MAIN;
1979 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1980 cfg->fc_metric = rtmsg->rtmsg_metric;
1981 cfg->fc_expires = rtmsg->rtmsg_info;
1982 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1983 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1984 cfg->fc_flags = rtmsg->rtmsg_flags;
1986 cfg->fc_nlinfo.nl_net = net;
1988 cfg->fc_dst = rtmsg->rtmsg_dst;
1989 cfg->fc_src = rtmsg->rtmsg_src;
1990 cfg->fc_gateway = rtmsg->rtmsg_gateway;
1993 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1995 struct fib6_config cfg;
1996 struct in6_rtmsg rtmsg;
2000 case SIOCADDRT: /* Add a route */
2001 case SIOCDELRT: /* Delete a route */
2002 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2004 err = copy_from_user(&rtmsg, arg,
2005 sizeof(struct in6_rtmsg));
2009 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2014 err = ip6_route_add(&cfg);
2017 err = ip6_route_del(&cfg);
2031 * Drop the packet on the floor
2034 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2037 struct dst_entry *dst = skb_dst(skb);
2038 switch (ipstats_mib_noroutes) {
2039 case IPSTATS_MIB_INNOROUTES:
2040 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2041 if (type == IPV6_ADDR_ANY) {
2042 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2043 IPSTATS_MIB_INADDRERRORS);
2047 case IPSTATS_MIB_OUTNOROUTES:
2048 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2049 ipstats_mib_noroutes);
2052 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2057 static int ip6_pkt_discard(struct sk_buff *skb)
2059 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2062 static int ip6_pkt_discard_out(struct sk_buff *skb)
2064 skb->dev = skb_dst(skb)->dev;
2065 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2068 static int ip6_pkt_prohibit(struct sk_buff *skb)
2070 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2073 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2075 skb->dev = skb_dst(skb)->dev;
2076 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2080 * Allocate a dst for local (unicast / anycast) address.
2083 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2084 const struct in6_addr *addr,
2087 struct net *net = dev_net(idev->dev);
2088 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2091 return ERR_PTR(-ENOMEM);
2095 rt->dst.flags |= DST_HOST;
2096 rt->dst.input = ip6_input;
2097 rt->dst.output = ip6_output;
2098 rt->rt6i_idev = idev;
2100 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2102 rt->rt6i_flags |= RTF_ANYCAST;
2104 rt->rt6i_flags |= RTF_LOCAL;
2106 rt->rt6i_gateway = *addr;
2107 rt->rt6i_dst.addr = *addr;
2108 rt->rt6i_dst.plen = 128;
2109 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2111 atomic_set(&rt->dst.__refcnt, 1);
2116 int ip6_route_get_saddr(struct net *net,
2117 struct rt6_info *rt,
2118 const struct in6_addr *daddr,
2120 struct in6_addr *saddr)
2122 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2124 if (rt->rt6i_prefsrc.plen)
2125 *saddr = rt->rt6i_prefsrc.addr;
2127 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2128 daddr, prefs, saddr);
2132 /* remove deleted ip from prefsrc entries */
2133 struct arg_dev_net_ip {
2134 struct net_device *dev;
2136 struct in6_addr *addr;
2139 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2141 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2142 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2143 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2145 if (((void *)rt->dst.dev == dev || !dev) &&
2146 rt != net->ipv6.ip6_null_entry &&
2147 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2148 /* remove prefsrc entry */
2149 rt->rt6i_prefsrc.plen = 0;
2154 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2156 struct net *net = dev_net(ifp->idev->dev);
2157 struct arg_dev_net_ip adni = {
2158 .dev = ifp->idev->dev,
2162 fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2165 struct arg_dev_net {
2166 struct net_device *dev;
2170 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2172 const struct arg_dev_net *adn = arg;
2173 const struct net_device *dev = adn->dev;
2175 if ((rt->dst.dev == dev || !dev) &&
2176 rt != adn->net->ipv6.ip6_null_entry)
2182 void rt6_ifdown(struct net *net, struct net_device *dev)
2184 struct arg_dev_net adn = {
2189 fib6_clean_all(net, fib6_ifdown, 0, &adn);
2190 icmp6_clean_all(fib6_ifdown, &adn);
2193 struct rt6_mtu_change_arg {
2194 struct net_device *dev;
2198 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2200 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2201 struct inet6_dev *idev;
2203 /* In IPv6 pmtu discovery is not optional,
2204 so that RTAX_MTU lock cannot disable it.
2205 We still use this lock to block changes
2206 caused by addrconf/ndisc.
2209 idev = __in6_dev_get(arg->dev);
2213 /* For administrative MTU increase, there is no way to discover
2214 IPv6 PMTU increase, so PMTU increase should be updated here.
2215 Since RFC 1981 doesn't include administrative MTU increase
2216 update PMTU increase is a MUST. (i.e. jumbo frame)
2219 If new MTU is less than route PMTU, this new MTU will be the
2220 lowest MTU in the path, update the route PMTU to reflect PMTU
2221 decreases; if new MTU is greater than route PMTU, and the
2222 old MTU is the lowest MTU in the path, update the route PMTU
2223 to reflect the increase. In this case if the other nodes' MTU
2224 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2227 if (rt->dst.dev == arg->dev &&
2228 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2229 (dst_mtu(&rt->dst) >= arg->mtu ||
2230 (dst_mtu(&rt->dst) < arg->mtu &&
2231 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2232 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2237 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2239 struct rt6_mtu_change_arg arg = {
2244 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2247 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2248 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2249 [RTA_OIF] = { .type = NLA_U32 },
2250 [RTA_IIF] = { .type = NLA_U32 },
2251 [RTA_PRIORITY] = { .type = NLA_U32 },
2252 [RTA_METRICS] = { .type = NLA_NESTED },
2253 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2254 [RTA_UID] = { .type = NLA_U32 },
2257 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2258 struct fib6_config *cfg)
2261 struct nlattr *tb[RTA_MAX+1];
2264 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2269 rtm = nlmsg_data(nlh);
2270 memset(cfg, 0, sizeof(*cfg));
2272 cfg->fc_table = rtm->rtm_table;
2273 cfg->fc_dst_len = rtm->rtm_dst_len;
2274 cfg->fc_src_len = rtm->rtm_src_len;
2275 cfg->fc_flags = RTF_UP;
2276 cfg->fc_protocol = rtm->rtm_protocol;
2277 cfg->fc_type = rtm->rtm_type;
2279 if (rtm->rtm_type == RTN_UNREACHABLE ||
2280 rtm->rtm_type == RTN_BLACKHOLE ||
2281 rtm->rtm_type == RTN_PROHIBIT ||
2282 rtm->rtm_type == RTN_THROW)
2283 cfg->fc_flags |= RTF_REJECT;
2285 if (rtm->rtm_type == RTN_LOCAL)
2286 cfg->fc_flags |= RTF_LOCAL;
2288 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2289 cfg->fc_nlinfo.nlh = nlh;
2290 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2292 if (tb[RTA_GATEWAY]) {
2293 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2294 cfg->fc_flags |= RTF_GATEWAY;
2298 int plen = (rtm->rtm_dst_len + 7) >> 3;
2300 if (nla_len(tb[RTA_DST]) < plen)
2303 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2307 int plen = (rtm->rtm_src_len + 7) >> 3;
2309 if (nla_len(tb[RTA_SRC]) < plen)
2312 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2315 if (tb[RTA_PREFSRC])
2316 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2319 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2321 if (tb[RTA_PRIORITY])
2322 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2324 if (tb[RTA_METRICS]) {
2325 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2326 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2330 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2332 if (tb[RTA_MULTIPATH]) {
2333 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2334 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2342 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2344 struct fib6_config r_cfg;
2345 struct rtnexthop *rtnh;
2348 int err = 0, last_err = 0;
2351 rtnh = (struct rtnexthop *)cfg->fc_mp;
2352 remaining = cfg->fc_mp_len;
2354 /* Parse a Multipath Entry */
2355 while (rtnh_ok(rtnh, remaining)) {
2356 memcpy(&r_cfg, cfg, sizeof(*cfg));
2357 if (rtnh->rtnh_ifindex)
2358 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2360 attrlen = rtnh_attrlen(rtnh);
2362 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2364 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2366 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2367 r_cfg.fc_flags |= RTF_GATEWAY;
2370 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2373 /* If we are trying to remove a route, do not stop the
2374 * loop when ip6_route_del() fails (because next hop is
2375 * already gone), we should try to remove all next hops.
2378 /* If add fails, we should try to delete all
2379 * next hops that have been already added.
2385 /* Because each route is added like a single route we remove
2386 * this flag after the first nexthop (if there is a collision,
2387 * we have already fail to add the first nexthop:
2388 * fib6_add_rt2node() has reject it).
2390 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2391 rtnh = rtnh_next(rtnh, &remaining);
2397 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2399 struct fib6_config cfg;
2402 err = rtm_to_fib6_config(skb, nlh, &cfg);
2407 return ip6_route_multipath(&cfg, 0);
2409 return ip6_route_del(&cfg);
2412 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2414 struct fib6_config cfg;
2417 err = rtm_to_fib6_config(skb, nlh, &cfg);
2422 return ip6_route_multipath(&cfg, 1);
2424 return ip6_route_add(&cfg);
2427 static inline size_t rt6_nlmsg_size(void)
2429 return NLMSG_ALIGN(sizeof(struct rtmsg))
2430 + nla_total_size(16) /* RTA_SRC */
2431 + nla_total_size(16) /* RTA_DST */
2432 + nla_total_size(16) /* RTA_GATEWAY */
2433 + nla_total_size(16) /* RTA_PREFSRC */
2434 + nla_total_size(4) /* RTA_TABLE */
2435 + nla_total_size(4) /* RTA_IIF */
2436 + nla_total_size(4) /* RTA_OIF */
2437 + nla_total_size(4) /* RTA_PRIORITY */
2438 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2439 + nla_total_size(sizeof(struct rta_cacheinfo));
2442 static int rt6_fill_node(struct net *net,
2443 struct sk_buff *skb, struct rt6_info *rt,
2444 struct in6_addr *dst, struct in6_addr *src,
2445 int iif, int type, u32 portid, u32 seq,
2446 int prefix, int nowait, unsigned int flags)
2449 struct nlmsghdr *nlh;
2453 if (prefix) { /* user wants prefix routes only */
2454 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2455 /* success since this is not a prefix route */
2460 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2464 rtm = nlmsg_data(nlh);
2465 rtm->rtm_family = AF_INET6;
2466 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2467 rtm->rtm_src_len = rt->rt6i_src.plen;
2470 table = rt->rt6i_table->tb6_id;
2472 table = RT6_TABLE_UNSPEC;
2473 rtm->rtm_table = table;
2474 if (nla_put_u32(skb, RTA_TABLE, table))
2475 goto nla_put_failure;
2476 if (rt->rt6i_flags & RTF_REJECT) {
2477 switch (rt->dst.error) {
2479 rtm->rtm_type = RTN_BLACKHOLE;
2482 rtm->rtm_type = RTN_PROHIBIT;
2485 rtm->rtm_type = RTN_THROW;
2488 rtm->rtm_type = RTN_UNREACHABLE;
2492 else if (rt->rt6i_flags & RTF_LOCAL)
2493 rtm->rtm_type = RTN_LOCAL;
2494 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2495 rtm->rtm_type = RTN_LOCAL;
2497 rtm->rtm_type = RTN_UNICAST;
2499 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2500 rtm->rtm_protocol = rt->rt6i_protocol;
2501 if (rt->rt6i_flags & RTF_DYNAMIC)
2502 rtm->rtm_protocol = RTPROT_REDIRECT;
2503 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2504 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2505 rtm->rtm_protocol = RTPROT_RA;
2507 rtm->rtm_protocol = RTPROT_KERNEL;
2510 if (rt->rt6i_flags & RTF_CACHE)
2511 rtm->rtm_flags |= RTM_F_CLONED;
2514 if (nla_put(skb, RTA_DST, 16, dst))
2515 goto nla_put_failure;
2516 rtm->rtm_dst_len = 128;
2517 } else if (rtm->rtm_dst_len)
2518 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2519 goto nla_put_failure;
2520 #ifdef CONFIG_IPV6_SUBTREES
2522 if (nla_put(skb, RTA_SRC, 16, src))
2523 goto nla_put_failure;
2524 rtm->rtm_src_len = 128;
2525 } else if (rtm->rtm_src_len &&
2526 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2527 goto nla_put_failure;
2530 #ifdef CONFIG_IPV6_MROUTE
2531 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2532 int err = ip6mr_get_route(net, skb, rtm, nowait);
2537 goto nla_put_failure;
2539 if (err == -EMSGSIZE)
2540 goto nla_put_failure;
2545 if (nla_put_u32(skb, RTA_IIF, iif))
2546 goto nla_put_failure;
2548 struct in6_addr saddr_buf;
2549 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2550 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2551 goto nla_put_failure;
2554 if (rt->rt6i_prefsrc.plen) {
2555 struct in6_addr saddr_buf;
2556 saddr_buf = rt->rt6i_prefsrc.addr;
2557 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2558 goto nla_put_failure;
2561 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2562 goto nla_put_failure;
2564 if (rt->rt6i_flags & RTF_GATEWAY) {
2565 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2566 goto nla_put_failure;
2570 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2571 goto nla_put_failure;
2572 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2573 goto nla_put_failure;
2575 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2577 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2578 goto nla_put_failure;
2580 return nlmsg_end(skb, nlh);
2583 nlmsg_cancel(skb, nlh);
2587 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2589 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2592 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2593 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2594 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2598 return rt6_fill_node(arg->net,
2599 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2600 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2601 prefix, 0, NLM_F_MULTI);
2604 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2606 struct net *net = sock_net(in_skb->sk);
2607 struct nlattr *tb[RTA_MAX+1];
2608 struct rt6_info *rt;
2609 struct sk_buff *skb;
2612 int err, iif = 0, oif = 0;
2614 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2619 memset(&fl6, 0, sizeof(fl6));
2622 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2625 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2629 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2632 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2636 iif = nla_get_u32(tb[RTA_IIF]);
2639 oif = nla_get_u32(tb[RTA_OIF]);
2642 fl6.flowi6_uid = make_kuid(current_user_ns(),
2643 nla_get_u32(tb[RTA_UID]));
2645 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
2648 struct net_device *dev;
2651 dev = __dev_get_by_index(net, iif);
2657 fl6.flowi6_iif = iif;
2659 if (!ipv6_addr_any(&fl6.saddr))
2660 flags |= RT6_LOOKUP_F_HAS_SADDR;
2662 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2665 fl6.flowi6_oif = oif;
2667 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2670 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2677 /* Reserve room for dummy headers, this skb can pass
2678 through good chunk of routing engine.
2680 skb_reset_mac_header(skb);
2681 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2683 skb_dst_set(skb, &rt->dst);
2685 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2686 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2687 nlh->nlmsg_seq, 0, 0, 0);
2693 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2698 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2700 struct sk_buff *skb;
2701 struct net *net = info->nl_net;
2706 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2708 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2712 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2713 event, info->portid, seq, 0, 0, 0);
2715 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2716 WARN_ON(err == -EMSGSIZE);
2720 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2721 info->nlh, gfp_any());
2725 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2728 static int ip6_route_dev_notify(struct notifier_block *this,
2729 unsigned long event, void *data)
2731 struct net_device *dev = (struct net_device *)data;
2732 struct net *net = dev_net(dev);
2734 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2735 net->ipv6.ip6_null_entry->dst.dev = dev;
2736 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2737 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2738 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2739 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2740 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2741 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2752 #ifdef CONFIG_PROC_FS
2763 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2765 struct seq_file *m = p_arg;
2767 seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
2769 #ifdef CONFIG_IPV6_SUBTREES
2770 seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
2772 seq_puts(m, "00000000000000000000000000000000 00 ");
2774 if (rt->rt6i_flags & RTF_GATEWAY) {
2775 seq_printf(m, "%pi6", &rt->rt6i_gateway);
2777 seq_puts(m, "00000000000000000000000000000000");
2779 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2780 rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
2781 rt->dst.__use, rt->rt6i_flags,
2782 rt->dst.dev ? rt->dst.dev->name : "");
2786 static int ipv6_route_show(struct seq_file *m, void *v)
2788 struct net *net = (struct net *)m->private;
2789 fib6_clean_all_ro(net, rt6_info_route, 0, m);
2793 static int ipv6_route_open(struct inode *inode, struct file *file)
2795 return single_open_net(inode, file, ipv6_route_show);
2798 static const struct file_operations ipv6_route_proc_fops = {
2799 .owner = THIS_MODULE,
2800 .open = ipv6_route_open,
2802 .llseek = seq_lseek,
2803 .release = single_release_net,
2806 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2808 struct net *net = (struct net *)seq->private;
2809 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2810 net->ipv6.rt6_stats->fib_nodes,
2811 net->ipv6.rt6_stats->fib_route_nodes,
2812 net->ipv6.rt6_stats->fib_rt_alloc,
2813 net->ipv6.rt6_stats->fib_rt_entries,
2814 net->ipv6.rt6_stats->fib_rt_cache,
2815 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2816 net->ipv6.rt6_stats->fib_discarded_routes);
2821 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2823 return single_open_net(inode, file, rt6_stats_seq_show);
2826 static const struct file_operations rt6_stats_seq_fops = {
2827 .owner = THIS_MODULE,
2828 .open = rt6_stats_seq_open,
2830 .llseek = seq_lseek,
2831 .release = single_release_net,
2833 #endif /* CONFIG_PROC_FS */
2835 #ifdef CONFIG_SYSCTL
2838 int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write,
2839 void __user *buffer, size_t *lenp, loff_t *ppos)
2846 net = (struct net *)ctl->extra1;
2847 delay = net->ipv6.sysctl.flush_delay;
2848 proc_dointvec(ctl, write, buffer, lenp, ppos);
2849 fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
2853 ctl_table ipv6_route_table_template[] = {
2855 .procname = "flush",
2856 .data = &init_net.ipv6.sysctl.flush_delay,
2857 .maxlen = sizeof(int),
2859 .proc_handler = ipv6_sysctl_rtcache_flush
2862 .procname = "gc_thresh",
2863 .data = &ip6_dst_ops_template.gc_thresh,
2864 .maxlen = sizeof(int),
2866 .proc_handler = proc_dointvec,
2869 .procname = "max_size",
2870 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2871 .maxlen = sizeof(int),
2873 .proc_handler = proc_dointvec,
2876 .procname = "gc_min_interval",
2877 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2878 .maxlen = sizeof(int),
2880 .proc_handler = proc_dointvec_jiffies,
2883 .procname = "gc_timeout",
2884 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2885 .maxlen = sizeof(int),
2887 .proc_handler = proc_dointvec_jiffies,
2890 .procname = "gc_interval",
2891 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2892 .maxlen = sizeof(int),
2894 .proc_handler = proc_dointvec_jiffies,
2897 .procname = "gc_elasticity",
2898 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2899 .maxlen = sizeof(int),
2901 .proc_handler = proc_dointvec,
2904 .procname = "mtu_expires",
2905 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2906 .maxlen = sizeof(int),
2908 .proc_handler = proc_dointvec_jiffies,
2911 .procname = "min_adv_mss",
2912 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2913 .maxlen = sizeof(int),
2915 .proc_handler = proc_dointvec,
2918 .procname = "gc_min_interval_ms",
2919 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2920 .maxlen = sizeof(int),
2922 .proc_handler = proc_dointvec_ms_jiffies,
2927 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2929 struct ctl_table *table;
2931 table = kmemdup(ipv6_route_table_template,
2932 sizeof(ipv6_route_table_template),
2936 table[0].data = &net->ipv6.sysctl.flush_delay;
2937 table[0].extra1 = net;
2938 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2939 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2940 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2941 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2942 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2943 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2944 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2945 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2946 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2948 /* Don't export sysctls to unprivileged users */
2949 if (net->user_ns != &init_user_ns)
2950 table[0].procname = NULL;
2957 static int __net_init ip6_route_net_init(struct net *net)
2961 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2962 sizeof(net->ipv6.ip6_dst_ops));
2964 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2965 goto out_ip6_dst_ops;
2967 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2968 sizeof(*net->ipv6.ip6_null_entry),
2970 if (!net->ipv6.ip6_null_entry)
2971 goto out_ip6_dst_entries;
2972 net->ipv6.ip6_null_entry->dst.path =
2973 (struct dst_entry *)net->ipv6.ip6_null_entry;
2974 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2975 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
2976 ip6_template_metrics, true);
2978 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2979 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2980 sizeof(*net->ipv6.ip6_prohibit_entry),
2982 if (!net->ipv6.ip6_prohibit_entry)
2983 goto out_ip6_null_entry;
2984 net->ipv6.ip6_prohibit_entry->dst.path =
2985 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
2986 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2987 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
2988 ip6_template_metrics, true);
2990 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
2991 sizeof(*net->ipv6.ip6_blk_hole_entry),
2993 if (!net->ipv6.ip6_blk_hole_entry)
2994 goto out_ip6_prohibit_entry;
2995 net->ipv6.ip6_blk_hole_entry->dst.path =
2996 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
2997 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2998 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
2999 ip6_template_metrics, true);
3002 net->ipv6.sysctl.flush_delay = 0;
3003 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3004 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3005 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3006 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3007 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3008 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3009 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3011 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3017 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3018 out_ip6_prohibit_entry:
3019 kfree(net->ipv6.ip6_prohibit_entry);
3021 kfree(net->ipv6.ip6_null_entry);
3023 out_ip6_dst_entries:
3024 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3029 static void __net_exit ip6_route_net_exit(struct net *net)
3031 kfree(net->ipv6.ip6_null_entry);
3032 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3033 kfree(net->ipv6.ip6_prohibit_entry);
3034 kfree(net->ipv6.ip6_blk_hole_entry);
3036 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3039 static int __net_init ip6_route_net_init_late(struct net *net)
3041 #ifdef CONFIG_PROC_FS
3042 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3043 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3048 static void __net_exit ip6_route_net_exit_late(struct net *net)
3050 #ifdef CONFIG_PROC_FS
3051 remove_proc_entry("ipv6_route", net->proc_net);
3052 remove_proc_entry("rt6_stats", net->proc_net);
3056 static struct pernet_operations ip6_route_net_ops = {
3057 .init = ip6_route_net_init,
3058 .exit = ip6_route_net_exit,
3061 static int __net_init ipv6_inetpeer_init(struct net *net)
3063 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3067 inet_peer_base_init(bp);
3068 net->ipv6.peers = bp;
3072 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3074 struct inet_peer_base *bp = net->ipv6.peers;
3076 net->ipv6.peers = NULL;
3077 inetpeer_invalidate_tree(bp);
3081 static struct pernet_operations ipv6_inetpeer_ops = {
3082 .init = ipv6_inetpeer_init,
3083 .exit = ipv6_inetpeer_exit,
3086 static struct pernet_operations ip6_route_net_late_ops = {
3087 .init = ip6_route_net_init_late,
3088 .exit = ip6_route_net_exit_late,
3091 static struct notifier_block ip6_route_dev_notifier = {
3092 .notifier_call = ip6_route_dev_notify,
3096 int __init ip6_route_init(void)
3101 ip6_dst_ops_template.kmem_cachep =
3102 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3103 SLAB_HWCACHE_ALIGN, NULL);
3104 if (!ip6_dst_ops_template.kmem_cachep)
3107 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3109 goto out_kmem_cache;
3111 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3113 goto out_dst_entries;
3115 ret = register_pernet_subsys(&ip6_route_net_ops);
3117 goto out_register_inetpeer;
3119 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3121 /* Registering of the loopback is done before this portion of code,
3122 * the loopback reference in rt6_info will not be taken, do it
3123 * manually for init_net */
3124 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3125 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3126 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3127 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3128 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3129 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3130 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3134 goto out_register_subsys;
3140 ret = fib6_rules_init();
3144 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3146 goto fib6_rules_init;
3149 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3150 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3151 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3152 goto out_register_late_subsys;
3154 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3156 goto out_register_late_subsys;
3161 out_register_late_subsys:
3162 unregister_pernet_subsys(&ip6_route_net_late_ops);
3164 fib6_rules_cleanup();
3169 out_register_subsys:
3170 unregister_pernet_subsys(&ip6_route_net_ops);
3171 out_register_inetpeer:
3172 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3174 dst_entries_destroy(&ip6_dst_blackhole_ops);
3176 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3180 void ip6_route_cleanup(void)
3182 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3183 unregister_pernet_subsys(&ip6_route_net_late_ops);
3184 fib6_rules_cleanup();
3187 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3188 unregister_pernet_subsys(&ip6_route_net_ops);
3189 dst_entries_destroy(&ip6_dst_blackhole_ops);
3190 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);