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
))
111 return dst_cow_metrics_generic(dst
, old
);
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
)
1143 dst_metric_set(dst
, RTAX_MTU
, mtu
);
1144 rt6_update_expires(rt6
, net
->ipv6
.sysctl
.ip6_rt_mtu_expires
);
1148 void ip6_update_pmtu(struct sk_buff
*skb
, struct net
*net
, __be32 mtu
,
1149 int oif
, u32 mark
, kuid_t uid
)
1151 const struct ipv6hdr
*iph
= (struct ipv6hdr
*) skb
->data
;
1152 struct dst_entry
*dst
;
1155 memset(&fl6
, 0, sizeof(fl6
));
1156 fl6
.flowi6_oif
= oif
;
1157 fl6
.flowi6_mark
= mark
? mark
: IP6_REPLY_MARK(net
, skb
->mark
);
1158 fl6
.flowi6_flags
= 0;
1159 fl6
.daddr
= iph
->daddr
;
1160 fl6
.saddr
= iph
->saddr
;
1161 fl6
.flowlabel
= ip6_flowinfo(iph
);
1162 fl6
.flowi6_uid
= uid
;
1164 dst
= ip6_route_output(net
, NULL
, &fl6
);
1166 ip6_rt_update_pmtu(dst
, NULL
, skb
, ntohl(mtu
));
1169 EXPORT_SYMBOL_GPL(ip6_update_pmtu
);
1171 void ip6_sk_update_pmtu(struct sk_buff
*skb
, struct sock
*sk
, __be32 mtu
)
1173 ip6_update_pmtu(skb
, sock_net(sk
), mtu
,
1174 sk
->sk_bound_dev_if
, sk
->sk_mark
, sock_i_uid(sk
));
1176 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu
);
1178 void ip6_redirect(struct sk_buff
*skb
, struct net
*net
, int oif
, u32 mark
)
1180 const struct ipv6hdr
*iph
= (struct ipv6hdr
*) skb
->data
;
1181 struct dst_entry
*dst
;
1184 memset(&fl6
, 0, sizeof(fl6
));
1185 fl6
.flowi6_oif
= oif
;
1186 fl6
.flowi6_mark
= mark
;
1187 fl6
.flowi6_flags
= 0;
1188 fl6
.daddr
= iph
->daddr
;
1189 fl6
.saddr
= iph
->saddr
;
1190 fl6
.flowlabel
= ip6_flowinfo(iph
);
1192 dst
= ip6_route_output(net
, NULL
, &fl6
);
1194 rt6_do_redirect(dst
, NULL
, skb
);
1197 EXPORT_SYMBOL_GPL(ip6_redirect
);
1199 void ip6_sk_redirect(struct sk_buff
*skb
, struct sock
*sk
)
1201 ip6_redirect(skb
, sock_net(sk
), sk
->sk_bound_dev_if
, sk
->sk_mark
);
1203 EXPORT_SYMBOL_GPL(ip6_sk_redirect
);
1205 static unsigned int ip6_default_advmss(const struct dst_entry
*dst
)
1207 struct net_device
*dev
= dst
->dev
;
1208 unsigned int mtu
= dst_mtu(dst
);
1209 struct net
*net
= dev_net(dev
);
1211 mtu
-= sizeof(struct ipv6hdr
) + sizeof(struct tcphdr
);
1213 if (mtu
< net
->ipv6
.sysctl
.ip6_rt_min_advmss
)
1214 mtu
= net
->ipv6
.sysctl
.ip6_rt_min_advmss
;
1217 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1218 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1219 * IPV6_MAXPLEN is also valid and means: "any MSS,
1220 * rely only on pmtu discovery"
1222 if (mtu
> IPV6_MAXPLEN
- sizeof(struct tcphdr
))
1227 static unsigned int ip6_mtu(const struct dst_entry
*dst
)
1229 struct inet6_dev
*idev
;
1230 unsigned int mtu
= dst_metric_raw(dst
, RTAX_MTU
);
1238 idev
= __in6_dev_get(dst
->dev
);
1240 mtu
= idev
->cnf
.mtu6
;
1244 return min_t(unsigned int, mtu
, IP6_MAX_MTU
);
1247 static struct dst_entry
*icmp6_dst_gc_list
;
1248 static DEFINE_SPINLOCK(icmp6_dst_lock
);
1250 struct dst_entry
*icmp6_dst_alloc(struct net_device
*dev
,
1253 struct dst_entry
*dst
;
1254 struct rt6_info
*rt
;
1255 struct inet6_dev
*idev
= in6_dev_get(dev
);
1256 struct net
*net
= dev_net(dev
);
1258 if (unlikely(!idev
))
1259 return ERR_PTR(-ENODEV
);
1261 rt
= ip6_dst_alloc(net
, dev
, 0, NULL
);
1262 if (unlikely(!rt
)) {
1264 dst
= ERR_PTR(-ENOMEM
);
1268 rt
->dst
.flags
|= DST_HOST
;
1269 rt
->dst
.output
= ip6_output
;
1270 atomic_set(&rt
->dst
.__refcnt
, 1);
1271 rt
->rt6i_gateway
= fl6
->daddr
;
1272 rt
->rt6i_dst
.addr
= fl6
->daddr
;
1273 rt
->rt6i_dst
.plen
= 128;
1274 rt
->rt6i_idev
= idev
;
1275 dst_metric_set(&rt
->dst
, RTAX_HOPLIMIT
, 0);
1277 spin_lock_bh(&icmp6_dst_lock
);
1278 rt
->dst
.next
= icmp6_dst_gc_list
;
1279 icmp6_dst_gc_list
= &rt
->dst
;
1280 spin_unlock_bh(&icmp6_dst_lock
);
1282 fib6_force_start_gc(net
);
1284 dst
= xfrm_lookup(net
, &rt
->dst
, flowi6_to_flowi(fl6
), NULL
, 0);
1290 int icmp6_dst_gc(void)
1292 struct dst_entry
*dst
, **pprev
;
1295 spin_lock_bh(&icmp6_dst_lock
);
1296 pprev
= &icmp6_dst_gc_list
;
1298 while ((dst
= *pprev
) != NULL
) {
1299 if (!atomic_read(&dst
->__refcnt
)) {
1308 spin_unlock_bh(&icmp6_dst_lock
);
1313 static void icmp6_clean_all(int (*func
)(struct rt6_info
*rt
, void *arg
),
1316 struct dst_entry
*dst
, **pprev
;
1318 spin_lock_bh(&icmp6_dst_lock
);
1319 pprev
= &icmp6_dst_gc_list
;
1320 while ((dst
= *pprev
) != NULL
) {
1321 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
1322 if (func(rt
, arg
)) {
1329 spin_unlock_bh(&icmp6_dst_lock
);
1332 static int ip6_dst_gc(struct dst_ops
*ops
)
1334 struct net
*net
= container_of(ops
, struct net
, ipv6
.ip6_dst_ops
);
1335 int rt_min_interval
= net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
;
1336 int rt_max_size
= net
->ipv6
.sysctl
.ip6_rt_max_size
;
1337 int rt_elasticity
= net
->ipv6
.sysctl
.ip6_rt_gc_elasticity
;
1338 int rt_gc_timeout
= net
->ipv6
.sysctl
.ip6_rt_gc_timeout
;
1339 unsigned long rt_last_gc
= net
->ipv6
.ip6_rt_last_gc
;
1342 entries
= dst_entries_get_fast(ops
);
1343 if (time_after(rt_last_gc
+ rt_min_interval
, jiffies
) &&
1344 entries
<= rt_max_size
)
1347 net
->ipv6
.ip6_rt_gc_expire
++;
1348 fib6_run_gc(net
->ipv6
.ip6_rt_gc_expire
, net
, entries
> rt_max_size
);
1349 entries
= dst_entries_get_slow(ops
);
1350 if (entries
< ops
->gc_thresh
)
1351 net
->ipv6
.ip6_rt_gc_expire
= rt_gc_timeout
>>1;
1353 net
->ipv6
.ip6_rt_gc_expire
-= net
->ipv6
.ip6_rt_gc_expire
>>rt_elasticity
;
1354 return entries
> rt_max_size
;
1357 int ip6_dst_hoplimit(struct dst_entry
*dst
)
1359 int hoplimit
= dst_metric_raw(dst
, RTAX_HOPLIMIT
);
1360 if (hoplimit
== 0) {
1361 struct net_device
*dev
= dst
->dev
;
1362 struct inet6_dev
*idev
;
1365 idev
= __in6_dev_get(dev
);
1367 hoplimit
= idev
->cnf
.hop_limit
;
1369 hoplimit
= dev_net(dev
)->ipv6
.devconf_all
->hop_limit
;
1374 EXPORT_SYMBOL(ip6_dst_hoplimit
);
1380 int ip6_route_add(struct fib6_config
*cfg
)
1383 struct net
*net
= cfg
->fc_nlinfo
.nl_net
;
1384 struct rt6_info
*rt
= NULL
;
1385 struct net_device
*dev
= NULL
;
1386 struct inet6_dev
*idev
= NULL
;
1387 struct fib6_table
*table
;
1390 if (cfg
->fc_dst_len
> 128 || cfg
->fc_src_len
> 128)
1392 #ifndef CONFIG_IPV6_SUBTREES
1393 if (cfg
->fc_src_len
)
1396 if (cfg
->fc_ifindex
) {
1398 dev
= dev_get_by_index(net
, cfg
->fc_ifindex
);
1401 idev
= in6_dev_get(dev
);
1406 if (cfg
->fc_metric
== 0)
1407 cfg
->fc_metric
= IP6_RT_PRIO_USER
;
1410 if (cfg
->fc_nlinfo
.nlh
&&
1411 !(cfg
->fc_nlinfo
.nlh
->nlmsg_flags
& NLM_F_CREATE
)) {
1412 table
= fib6_get_table(net
, cfg
->fc_table
);
1414 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1415 table
= fib6_new_table(net
, cfg
->fc_table
);
1418 table
= fib6_new_table(net
, cfg
->fc_table
);
1424 rt
= ip6_dst_alloc(net
, NULL
, (cfg
->fc_flags
& RTF_ADDRCONF
) ? 0 : DST_NOCOUNT
, table
);
1431 if (cfg
->fc_flags
& RTF_EXPIRES
)
1432 rt6_set_expires(rt
, jiffies
+
1433 clock_t_to_jiffies(cfg
->fc_expires
));
1435 rt6_clean_expires(rt
);
1437 if (cfg
->fc_protocol
== RTPROT_UNSPEC
)
1438 cfg
->fc_protocol
= RTPROT_BOOT
;
1439 rt
->rt6i_protocol
= cfg
->fc_protocol
;
1441 addr_type
= ipv6_addr_type(&cfg
->fc_dst
);
1443 if (addr_type
& IPV6_ADDR_MULTICAST
)
1444 rt
->dst
.input
= ip6_mc_input
;
1445 else if (cfg
->fc_flags
& RTF_LOCAL
)
1446 rt
->dst
.input
= ip6_input
;
1448 rt
->dst
.input
= ip6_forward
;
1450 rt
->dst
.output
= ip6_output
;
1452 ipv6_addr_prefix(&rt
->rt6i_dst
.addr
, &cfg
->fc_dst
, cfg
->fc_dst_len
);
1453 rt
->rt6i_dst
.plen
= cfg
->fc_dst_len
;
1454 if (rt
->rt6i_dst
.plen
== 128)
1455 rt
->dst
.flags
|= DST_HOST
;
1457 if (!(rt
->dst
.flags
& DST_HOST
) && cfg
->fc_mx
) {
1458 u32
*metrics
= kzalloc(sizeof(u32
) * RTAX_MAX
, GFP_KERNEL
);
1463 dst_init_metrics(&rt
->dst
, metrics
, 0);
1465 #ifdef CONFIG_IPV6_SUBTREES
1466 ipv6_addr_prefix(&rt
->rt6i_src
.addr
, &cfg
->fc_src
, cfg
->fc_src_len
);
1467 rt
->rt6i_src
.plen
= cfg
->fc_src_len
;
1470 rt
->rt6i_metric
= cfg
->fc_metric
;
1472 /* We cannot add true routes via loopback here,
1473 they would result in kernel looping; promote them to reject routes
1475 if ((cfg
->fc_flags
& RTF_REJECT
) ||
1476 (dev
&& (dev
->flags
& IFF_LOOPBACK
) &&
1477 !(addr_type
& IPV6_ADDR_LOOPBACK
) &&
1478 !(cfg
->fc_flags
& RTF_LOCAL
))) {
1479 /* hold loopback dev/idev if we haven't done so. */
1480 if (dev
!= net
->loopback_dev
) {
1485 dev
= net
->loopback_dev
;
1487 idev
= in6_dev_get(dev
);
1493 rt
->rt6i_flags
= RTF_REJECT
|RTF_NONEXTHOP
;
1494 switch (cfg
->fc_type
) {
1496 rt
->dst
.error
= -EINVAL
;
1497 rt
->dst
.output
= dst_discard
;
1498 rt
->dst
.input
= dst_discard
;
1501 rt
->dst
.error
= -EACCES
;
1502 rt
->dst
.output
= ip6_pkt_prohibit_out
;
1503 rt
->dst
.input
= ip6_pkt_prohibit
;
1507 rt
->dst
.error
= (cfg
->fc_type
== RTN_THROW
) ? -EAGAIN
1509 rt
->dst
.output
= ip6_pkt_discard_out
;
1510 rt
->dst
.input
= ip6_pkt_discard
;
1516 if (cfg
->fc_flags
& RTF_GATEWAY
) {
1517 const struct in6_addr
*gw_addr
;
1520 gw_addr
= &cfg
->fc_gateway
;
1521 rt
->rt6i_gateway
= *gw_addr
;
1522 gwa_type
= ipv6_addr_type(gw_addr
);
1524 if (gwa_type
!= (IPV6_ADDR_LINKLOCAL
|IPV6_ADDR_UNICAST
)) {
1525 struct rt6_info
*grt
;
1527 /* IPv6 strictly inhibits using not link-local
1528 addresses as nexthop address.
1529 Otherwise, router will not able to send redirects.
1530 It is very good, but in some (rare!) circumstances
1531 (SIT, PtP, NBMA NOARP links) it is handy to allow
1532 some exceptions. --ANK
1535 if (!(gwa_type
& IPV6_ADDR_UNICAST
))
1538 grt
= rt6_lookup(net
, gw_addr
, NULL
, cfg
->fc_ifindex
, 1);
1540 err
= -EHOSTUNREACH
;
1544 if (dev
!= grt
->dst
.dev
) {
1550 idev
= grt
->rt6i_idev
;
1552 in6_dev_hold(grt
->rt6i_idev
);
1554 if (!(grt
->rt6i_flags
& RTF_GATEWAY
))
1562 if (!dev
|| (dev
->flags
& IFF_LOOPBACK
))
1570 if (!ipv6_addr_any(&cfg
->fc_prefsrc
)) {
1571 if (!ipv6_chk_addr(net
, &cfg
->fc_prefsrc
, dev
, 0)) {
1575 rt
->rt6i_prefsrc
.addr
= cfg
->fc_prefsrc
;
1576 rt
->rt6i_prefsrc
.plen
= 128;
1578 rt
->rt6i_prefsrc
.plen
= 0;
1580 rt
->rt6i_flags
= cfg
->fc_flags
;
1587 nla_for_each_attr(nla
, cfg
->fc_mx
, cfg
->fc_mx_len
, remaining
) {
1588 int type
= nla_type(nla
);
1591 if (type
> RTAX_MAX
) {
1596 dst_metric_set(&rt
->dst
, type
, nla_get_u32(nla
));
1602 rt
->rt6i_idev
= idev
;
1603 rt
->rt6i_table
= table
;
1605 cfg
->fc_nlinfo
.nl_net
= dev_net(dev
);
1607 return __ip6_ins_rt(rt
, &cfg
->fc_nlinfo
);
1619 static int __ip6_del_rt(struct rt6_info
*rt
, struct nl_info
*info
)
1622 struct fib6_table
*table
;
1623 struct net
*net
= dev_net(rt
->dst
.dev
);
1625 if (rt
== net
->ipv6
.ip6_null_entry
) {
1630 table
= rt
->rt6i_table
;
1631 write_lock_bh(&table
->tb6_lock
);
1632 err
= fib6_del(rt
, info
);
1633 write_unlock_bh(&table
->tb6_lock
);
1640 int ip6_del_rt(struct rt6_info
*rt
)
1642 struct nl_info info
= {
1643 .nl_net
= dev_net(rt
->dst
.dev
),
1645 return __ip6_del_rt(rt
, &info
);
1648 static int ip6_route_del(struct fib6_config
*cfg
)
1650 struct fib6_table
*table
;
1651 struct fib6_node
*fn
;
1652 struct rt6_info
*rt
;
1655 table
= fib6_get_table(cfg
->fc_nlinfo
.nl_net
, cfg
->fc_table
);
1659 read_lock_bh(&table
->tb6_lock
);
1661 fn
= fib6_locate(&table
->tb6_root
,
1662 &cfg
->fc_dst
, cfg
->fc_dst_len
,
1663 &cfg
->fc_src
, cfg
->fc_src_len
);
1666 for (rt
= fn
->leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
1667 if (cfg
->fc_ifindex
&&
1669 rt
->dst
.dev
->ifindex
!= cfg
->fc_ifindex
))
1671 if (cfg
->fc_flags
& RTF_GATEWAY
&&
1672 !ipv6_addr_equal(&cfg
->fc_gateway
, &rt
->rt6i_gateway
))
1674 if (cfg
->fc_metric
&& cfg
->fc_metric
!= rt
->rt6i_metric
)
1676 if (cfg
->fc_protocol
&& cfg
->fc_protocol
!= rt
->rt6i_protocol
)
1679 read_unlock_bh(&table
->tb6_lock
);
1681 return __ip6_del_rt(rt
, &cfg
->fc_nlinfo
);
1684 read_unlock_bh(&table
->tb6_lock
);
1689 static void rt6_do_redirect(struct dst_entry
*dst
, struct sock
*sk
, struct sk_buff
*skb
)
1691 struct net
*net
= dev_net(skb
->dev
);
1692 struct netevent_redirect netevent
;
1693 struct rt6_info
*rt
, *nrt
= NULL
;
1694 struct ndisc_options ndopts
;
1695 struct inet6_dev
*in6_dev
;
1696 struct neighbour
*neigh
;
1698 int optlen
, on_link
;
1701 optlen
= skb
->tail
- skb
->transport_header
;
1702 optlen
-= sizeof(*msg
);
1705 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1709 msg
= (struct rd_msg
*)icmp6_hdr(skb
);
1711 if (ipv6_addr_is_multicast(&msg
->dest
)) {
1712 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1717 if (ipv6_addr_equal(&msg
->dest
, &msg
->target
)) {
1719 } else if (ipv6_addr_type(&msg
->target
) !=
1720 (IPV6_ADDR_UNICAST
|IPV6_ADDR_LINKLOCAL
)) {
1721 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1725 in6_dev
= __in6_dev_get(skb
->dev
);
1728 if (in6_dev
->cnf
.forwarding
|| !in6_dev
->cnf
.accept_redirects
)
1732 * The IP source address of the Redirect MUST be the same as the current
1733 * first-hop router for the specified ICMP Destination Address.
1736 if (!ndisc_parse_options(msg
->opt
, optlen
, &ndopts
)) {
1737 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1742 if (ndopts
.nd_opts_tgt_lladdr
) {
1743 lladdr
= ndisc_opt_addr_data(ndopts
.nd_opts_tgt_lladdr
,
1746 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1751 rt
= (struct rt6_info
*) dst
;
1752 if (rt
== net
->ipv6
.ip6_null_entry
) {
1753 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1757 /* Redirect received -> path was valid.
1758 * Look, redirects are sent only in response to data packets,
1759 * so that this nexthop apparently is reachable. --ANK
1761 dst_confirm(&rt
->dst
);
1763 neigh
= __neigh_lookup(&nd_tbl
, &msg
->target
, skb
->dev
, 1);
1768 * We have finally decided to accept it.
1771 neigh_update(neigh
, lladdr
, NUD_STALE
,
1772 NEIGH_UPDATE_F_WEAK_OVERRIDE
|
1773 NEIGH_UPDATE_F_OVERRIDE
|
1774 (on_link
? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER
|
1775 NEIGH_UPDATE_F_ISROUTER
))
1778 nrt
= ip6_rt_copy(rt
, &msg
->dest
);
1782 nrt
->rt6i_flags
= RTF_GATEWAY
|RTF_UP
|RTF_DYNAMIC
|RTF_CACHE
;
1784 nrt
->rt6i_flags
&= ~RTF_GATEWAY
;
1786 nrt
->rt6i_gateway
= *(struct in6_addr
*)neigh
->primary_key
;
1788 if (ip6_ins_rt(nrt
))
1791 netevent
.old
= &rt
->dst
;
1792 netevent
.new = &nrt
->dst
;
1793 netevent
.daddr
= &msg
->dest
;
1794 netevent
.neigh
= neigh
;
1795 call_netevent_notifiers(NETEVENT_REDIRECT
, &netevent
);
1797 if (rt
->rt6i_flags
& RTF_CACHE
) {
1798 rt
= (struct rt6_info
*) dst_clone(&rt
->dst
);
1803 neigh_release(neigh
);
1807 * Misc support functions
1810 static struct rt6_info
*ip6_rt_copy(struct rt6_info
*ort
,
1811 const struct in6_addr
*dest
)
1813 struct net
*net
= dev_net(ort
->dst
.dev
);
1814 struct rt6_info
*rt
= ip6_dst_alloc(net
, ort
->dst
.dev
, 0,
1818 rt
->dst
.input
= ort
->dst
.input
;
1819 rt
->dst
.output
= ort
->dst
.output
;
1820 rt
->dst
.flags
|= DST_HOST
;
1822 rt
->rt6i_dst
.addr
= *dest
;
1823 rt
->rt6i_dst
.plen
= 128;
1824 dst_copy_metrics(&rt
->dst
, &ort
->dst
);
1825 rt
->dst
.error
= ort
->dst
.error
;
1826 rt
->rt6i_idev
= ort
->rt6i_idev
;
1828 in6_dev_hold(rt
->rt6i_idev
);
1829 rt
->dst
.lastuse
= jiffies
;
1831 if (ort
->rt6i_flags
& RTF_GATEWAY
)
1832 rt
->rt6i_gateway
= ort
->rt6i_gateway
;
1834 rt
->rt6i_gateway
= *dest
;
1835 rt
->rt6i_flags
= ort
->rt6i_flags
;
1836 rt6_set_from(rt
, ort
);
1837 rt
->rt6i_metric
= 0;
1839 #ifdef CONFIG_IPV6_SUBTREES
1840 memcpy(&rt
->rt6i_src
, &ort
->rt6i_src
, sizeof(struct rt6key
));
1842 memcpy(&rt
->rt6i_prefsrc
, &ort
->rt6i_prefsrc
, sizeof(struct rt6key
));
1843 rt
->rt6i_table
= ort
->rt6i_table
;
1848 #ifdef CONFIG_IPV6_ROUTE_INFO
1849 static struct rt6_info
*rt6_get_route_info(struct net_device
*dev
,
1850 const struct in6_addr
*prefix
, int prefixlen
,
1851 const struct in6_addr
*gwaddr
)
1853 struct fib6_node
*fn
;
1854 struct rt6_info
*rt
= NULL
;
1855 struct fib6_table
*table
;
1857 table
= fib6_get_table(dev_net(dev
),
1858 addrconf_rt_table(dev
, RT6_TABLE_INFO
));
1862 read_lock_bh(&table
->tb6_lock
);
1863 fn
= fib6_locate(&table
->tb6_root
, prefix
,prefixlen
, NULL
, 0);
1867 for (rt
= fn
->leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
1868 if (rt
->dst
.dev
->ifindex
!= dev
->ifindex
)
1870 if ((rt
->rt6i_flags
& (RTF_ROUTEINFO
|RTF_GATEWAY
)) != (RTF_ROUTEINFO
|RTF_GATEWAY
))
1872 if (!ipv6_addr_equal(&rt
->rt6i_gateway
, gwaddr
))
1878 read_unlock_bh(&table
->tb6_lock
);
1882 static struct rt6_info
*rt6_add_route_info(struct net_device
*dev
,
1883 const struct in6_addr
*prefix
, int prefixlen
,
1884 const struct in6_addr
*gwaddr
, unsigned int pref
)
1886 struct fib6_config cfg
= {
1887 .fc_table
= addrconf_rt_table(dev
, RT6_TABLE_INFO
),
1888 .fc_metric
= IP6_RT_PRIO_USER
,
1889 .fc_ifindex
= dev
->ifindex
,
1890 .fc_dst_len
= prefixlen
,
1891 .fc_flags
= RTF_GATEWAY
| RTF_ADDRCONF
| RTF_ROUTEINFO
|
1892 RTF_UP
| RTF_PREF(pref
),
1893 .fc_nlinfo
.portid
= 0,
1894 .fc_nlinfo
.nlh
= NULL
,
1895 .fc_nlinfo
.nl_net
= dev_net(dev
),
1898 cfg
.fc_dst
= *prefix
;
1899 cfg
.fc_gateway
= *gwaddr
;
1901 /* We should treat it as a default route if prefix length is 0. */
1903 cfg
.fc_flags
|= RTF_DEFAULT
;
1905 ip6_route_add(&cfg
);
1907 return rt6_get_route_info(dev
, prefix
, prefixlen
, gwaddr
);
1911 struct rt6_info
*rt6_get_dflt_router(const struct in6_addr
*addr
, struct net_device
*dev
)
1913 struct rt6_info
*rt
;
1914 struct fib6_table
*table
;
1916 table
= fib6_get_table(dev_net(dev
),
1917 addrconf_rt_table(dev
, RT6_TABLE_MAIN
));
1921 read_lock_bh(&table
->tb6_lock
);
1922 for (rt
= table
->tb6_root
.leaf
; rt
; rt
=rt
->dst
.rt6_next
) {
1923 if (dev
== rt
->dst
.dev
&&
1924 ((rt
->rt6i_flags
& (RTF_ADDRCONF
| RTF_DEFAULT
)) == (RTF_ADDRCONF
| RTF_DEFAULT
)) &&
1925 ipv6_addr_equal(&rt
->rt6i_gateway
, addr
))
1930 read_unlock_bh(&table
->tb6_lock
);
1934 struct rt6_info
*rt6_add_dflt_router(const struct in6_addr
*gwaddr
,
1935 struct net_device
*dev
,
1938 struct fib6_config cfg
= {
1939 .fc_table
= addrconf_rt_table(dev
, RT6_TABLE_DFLT
),
1940 .fc_metric
= IP6_RT_PRIO_USER
,
1941 .fc_ifindex
= dev
->ifindex
,
1942 .fc_flags
= RTF_GATEWAY
| RTF_ADDRCONF
| RTF_DEFAULT
|
1943 RTF_UP
| RTF_EXPIRES
| RTF_PREF(pref
),
1944 .fc_nlinfo
.portid
= 0,
1945 .fc_nlinfo
.nlh
= NULL
,
1946 .fc_nlinfo
.nl_net
= dev_net(dev
),
1949 cfg
.fc_gateway
= *gwaddr
;
1951 ip6_route_add(&cfg
);
1953 return rt6_get_dflt_router(gwaddr
, dev
);
1957 int rt6_addrconf_purge(struct rt6_info
*rt
, void *arg
) {
1958 if (rt
->rt6i_flags
& (RTF_DEFAULT
| RTF_ADDRCONF
) &&
1959 (!rt
->rt6i_idev
|| rt
->rt6i_idev
->cnf
.accept_ra
!= 2))
1964 void rt6_purge_dflt_routers(struct net
*net
)
1966 fib6_clean_all(net
, rt6_addrconf_purge
, 0, NULL
);
1969 static void rtmsg_to_fib6_config(struct net
*net
,
1970 struct in6_rtmsg
*rtmsg
,
1971 struct fib6_config
*cfg
)
1973 memset(cfg
, 0, sizeof(*cfg
));
1975 cfg
->fc_table
= RT6_TABLE_MAIN
;
1976 cfg
->fc_ifindex
= rtmsg
->rtmsg_ifindex
;
1977 cfg
->fc_metric
= rtmsg
->rtmsg_metric
;
1978 cfg
->fc_expires
= rtmsg
->rtmsg_info
;
1979 cfg
->fc_dst_len
= rtmsg
->rtmsg_dst_len
;
1980 cfg
->fc_src_len
= rtmsg
->rtmsg_src_len
;
1981 cfg
->fc_flags
= rtmsg
->rtmsg_flags
;
1983 cfg
->fc_nlinfo
.nl_net
= net
;
1985 cfg
->fc_dst
= rtmsg
->rtmsg_dst
;
1986 cfg
->fc_src
= rtmsg
->rtmsg_src
;
1987 cfg
->fc_gateway
= rtmsg
->rtmsg_gateway
;
1990 int ipv6_route_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
1992 struct fib6_config cfg
;
1993 struct in6_rtmsg rtmsg
;
1997 case SIOCADDRT
: /* Add a route */
1998 case SIOCDELRT
: /* Delete a route */
1999 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
2001 err
= copy_from_user(&rtmsg
, arg
,
2002 sizeof(struct in6_rtmsg
));
2006 rtmsg_to_fib6_config(net
, &rtmsg
, &cfg
);
2011 err
= ip6_route_add(&cfg
);
2014 err
= ip6_route_del(&cfg
);
2028 * Drop the packet on the floor
2031 static int ip6_pkt_drop(struct sk_buff
*skb
, u8 code
, int ipstats_mib_noroutes
)
2034 struct dst_entry
*dst
= skb_dst(skb
);
2035 switch (ipstats_mib_noroutes
) {
2036 case IPSTATS_MIB_INNOROUTES
:
2037 type
= ipv6_addr_type(&ipv6_hdr(skb
)->daddr
);
2038 if (type
== IPV6_ADDR_ANY
) {
2039 IP6_INC_STATS(dev_net(dst
->dev
), ip6_dst_idev(dst
),
2040 IPSTATS_MIB_INADDRERRORS
);
2044 case IPSTATS_MIB_OUTNOROUTES
:
2045 IP6_INC_STATS(dev_net(dst
->dev
), ip6_dst_idev(dst
),
2046 ipstats_mib_noroutes
);
2049 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, code
, 0);
2054 static int ip6_pkt_discard(struct sk_buff
*skb
)
2056 return ip6_pkt_drop(skb
, ICMPV6_NOROUTE
, IPSTATS_MIB_INNOROUTES
);
2059 static int ip6_pkt_discard_out(struct sk_buff
*skb
)
2061 skb
->dev
= skb_dst(skb
)->dev
;
2062 return ip6_pkt_drop(skb
, ICMPV6_NOROUTE
, IPSTATS_MIB_OUTNOROUTES
);
2065 static int ip6_pkt_prohibit(struct sk_buff
*skb
)
2067 return ip6_pkt_drop(skb
, ICMPV6_ADM_PROHIBITED
, IPSTATS_MIB_INNOROUTES
);
2070 static int ip6_pkt_prohibit_out(struct sk_buff
*skb
)
2072 skb
->dev
= skb_dst(skb
)->dev
;
2073 return ip6_pkt_drop(skb
, ICMPV6_ADM_PROHIBITED
, IPSTATS_MIB_OUTNOROUTES
);
2077 * Allocate a dst for local (unicast / anycast) address.
2080 struct rt6_info
*addrconf_dst_alloc(struct inet6_dev
*idev
,
2081 const struct in6_addr
*addr
,
2084 struct net
*net
= dev_net(idev
->dev
);
2085 struct rt6_info
*rt
= ip6_dst_alloc(net
, net
->loopback_dev
,
2088 return ERR_PTR(-ENOMEM
);
2092 rt
->dst
.flags
|= DST_HOST
;
2093 rt
->dst
.input
= ip6_input
;
2094 rt
->dst
.output
= ip6_output
;
2095 rt
->rt6i_idev
= idev
;
2097 rt
->rt6i_flags
= RTF_UP
| RTF_NONEXTHOP
;
2099 rt
->rt6i_flags
|= RTF_ANYCAST
;
2101 rt
->rt6i_flags
|= RTF_LOCAL
;
2103 rt
->rt6i_gateway
= *addr
;
2104 rt
->rt6i_dst
.addr
= *addr
;
2105 rt
->rt6i_dst
.plen
= 128;
2106 rt
->rt6i_table
= fib6_get_table(net
, RT6_TABLE_LOCAL
);
2108 atomic_set(&rt
->dst
.__refcnt
, 1);
2113 int ip6_route_get_saddr(struct net
*net
,
2114 struct rt6_info
*rt
,
2115 const struct in6_addr
*daddr
,
2117 struct in6_addr
*saddr
)
2119 struct inet6_dev
*idev
= ip6_dst_idev((struct dst_entry
*)rt
);
2121 if (rt
->rt6i_prefsrc
.plen
)
2122 *saddr
= rt
->rt6i_prefsrc
.addr
;
2124 err
= ipv6_dev_get_saddr(net
, idev
? idev
->dev
: NULL
,
2125 daddr
, prefs
, saddr
);
2129 /* remove deleted ip from prefsrc entries */
2130 struct arg_dev_net_ip
{
2131 struct net_device
*dev
;
2133 struct in6_addr
*addr
;
2136 static int fib6_remove_prefsrc(struct rt6_info
*rt
, void *arg
)
2138 struct net_device
*dev
= ((struct arg_dev_net_ip
*)arg
)->dev
;
2139 struct net
*net
= ((struct arg_dev_net_ip
*)arg
)->net
;
2140 struct in6_addr
*addr
= ((struct arg_dev_net_ip
*)arg
)->addr
;
2142 if (((void *)rt
->dst
.dev
== dev
|| !dev
) &&
2143 rt
!= net
->ipv6
.ip6_null_entry
&&
2144 ipv6_addr_equal(addr
, &rt
->rt6i_prefsrc
.addr
)) {
2145 /* remove prefsrc entry */
2146 rt
->rt6i_prefsrc
.plen
= 0;
2151 void rt6_remove_prefsrc(struct inet6_ifaddr
*ifp
)
2153 struct net
*net
= dev_net(ifp
->idev
->dev
);
2154 struct arg_dev_net_ip adni
= {
2155 .dev
= ifp
->idev
->dev
,
2159 fib6_clean_all(net
, fib6_remove_prefsrc
, 0, &adni
);
2162 struct arg_dev_net
{
2163 struct net_device
*dev
;
2167 static int fib6_ifdown(struct rt6_info
*rt
, void *arg
)
2169 const struct arg_dev_net
*adn
= arg
;
2170 const struct net_device
*dev
= adn
->dev
;
2172 if ((rt
->dst
.dev
== dev
|| !dev
) &&
2173 rt
!= adn
->net
->ipv6
.ip6_null_entry
)
2179 void rt6_ifdown(struct net
*net
, struct net_device
*dev
)
2181 struct arg_dev_net adn
= {
2186 fib6_clean_all(net
, fib6_ifdown
, 0, &adn
);
2187 icmp6_clean_all(fib6_ifdown
, &adn
);
2190 struct rt6_mtu_change_arg
{
2191 struct net_device
*dev
;
2195 static int rt6_mtu_change_route(struct rt6_info
*rt
, void *p_arg
)
2197 struct rt6_mtu_change_arg
*arg
= (struct rt6_mtu_change_arg
*) p_arg
;
2198 struct inet6_dev
*idev
;
2200 /* In IPv6 pmtu discovery is not optional,
2201 so that RTAX_MTU lock cannot disable it.
2202 We still use this lock to block changes
2203 caused by addrconf/ndisc.
2206 idev
= __in6_dev_get(arg
->dev
);
2210 /* For administrative MTU increase, there is no way to discover
2211 IPv6 PMTU increase, so PMTU increase should be updated here.
2212 Since RFC 1981 doesn't include administrative MTU increase
2213 update PMTU increase is a MUST. (i.e. jumbo frame)
2216 If new MTU is less than route PMTU, this new MTU will be the
2217 lowest MTU in the path, update the route PMTU to reflect PMTU
2218 decreases; if new MTU is greater than route PMTU, and the
2219 old MTU is the lowest MTU in the path, update the route PMTU
2220 to reflect the increase. In this case if the other nodes' MTU
2221 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2224 if (rt
->dst
.dev
== arg
->dev
&&
2225 !dst_metric_locked(&rt
->dst
, RTAX_MTU
) &&
2226 (dst_mtu(&rt
->dst
) >= arg
->mtu
||
2227 (dst_mtu(&rt
->dst
) < arg
->mtu
&&
2228 dst_mtu(&rt
->dst
) == idev
->cnf
.mtu6
))) {
2229 dst_metric_set(&rt
->dst
, RTAX_MTU
, arg
->mtu
);
2234 void rt6_mtu_change(struct net_device
*dev
, unsigned int mtu
)
2236 struct rt6_mtu_change_arg arg
= {
2241 fib6_clean_all(dev_net(dev
), rt6_mtu_change_route
, 0, &arg
);
2244 static const struct nla_policy rtm_ipv6_policy
[RTA_MAX
+1] = {
2245 [RTA_GATEWAY
] = { .len
= sizeof(struct in6_addr
) },
2246 [RTA_OIF
] = { .type
= NLA_U32
},
2247 [RTA_IIF
] = { .type
= NLA_U32
},
2248 [RTA_PRIORITY
] = { .type
= NLA_U32
},
2249 [RTA_METRICS
] = { .type
= NLA_NESTED
},
2250 [RTA_MULTIPATH
] = { .len
= sizeof(struct rtnexthop
) },
2251 [RTA_UID
] = { .type
= NLA_U32
},
2254 static int rtm_to_fib6_config(struct sk_buff
*skb
, struct nlmsghdr
*nlh
,
2255 struct fib6_config
*cfg
)
2258 struct nlattr
*tb
[RTA_MAX
+1];
2261 err
= nlmsg_parse(nlh
, sizeof(*rtm
), tb
, RTA_MAX
, rtm_ipv6_policy
);
2266 rtm
= nlmsg_data(nlh
);
2267 memset(cfg
, 0, sizeof(*cfg
));
2269 cfg
->fc_table
= rtm
->rtm_table
;
2270 cfg
->fc_dst_len
= rtm
->rtm_dst_len
;
2271 cfg
->fc_src_len
= rtm
->rtm_src_len
;
2272 cfg
->fc_flags
= RTF_UP
;
2273 cfg
->fc_protocol
= rtm
->rtm_protocol
;
2274 cfg
->fc_type
= rtm
->rtm_type
;
2276 if (rtm
->rtm_type
== RTN_UNREACHABLE
||
2277 rtm
->rtm_type
== RTN_BLACKHOLE
||
2278 rtm
->rtm_type
== RTN_PROHIBIT
||
2279 rtm
->rtm_type
== RTN_THROW
)
2280 cfg
->fc_flags
|= RTF_REJECT
;
2282 if (rtm
->rtm_type
== RTN_LOCAL
)
2283 cfg
->fc_flags
|= RTF_LOCAL
;
2285 cfg
->fc_nlinfo
.portid
= NETLINK_CB(skb
).portid
;
2286 cfg
->fc_nlinfo
.nlh
= nlh
;
2287 cfg
->fc_nlinfo
.nl_net
= sock_net(skb
->sk
);
2289 if (tb
[RTA_GATEWAY
]) {
2290 nla_memcpy(&cfg
->fc_gateway
, tb
[RTA_GATEWAY
], 16);
2291 cfg
->fc_flags
|= RTF_GATEWAY
;
2295 int plen
= (rtm
->rtm_dst_len
+ 7) >> 3;
2297 if (nla_len(tb
[RTA_DST
]) < plen
)
2300 nla_memcpy(&cfg
->fc_dst
, tb
[RTA_DST
], plen
);
2304 int plen
= (rtm
->rtm_src_len
+ 7) >> 3;
2306 if (nla_len(tb
[RTA_SRC
]) < plen
)
2309 nla_memcpy(&cfg
->fc_src
, tb
[RTA_SRC
], plen
);
2312 if (tb
[RTA_PREFSRC
])
2313 nla_memcpy(&cfg
->fc_prefsrc
, tb
[RTA_PREFSRC
], 16);
2316 cfg
->fc_ifindex
= nla_get_u32(tb
[RTA_OIF
]);
2318 if (tb
[RTA_PRIORITY
])
2319 cfg
->fc_metric
= nla_get_u32(tb
[RTA_PRIORITY
]);
2321 if (tb
[RTA_METRICS
]) {
2322 cfg
->fc_mx
= nla_data(tb
[RTA_METRICS
]);
2323 cfg
->fc_mx_len
= nla_len(tb
[RTA_METRICS
]);
2327 cfg
->fc_table
= nla_get_u32(tb
[RTA_TABLE
]);
2329 if (tb
[RTA_MULTIPATH
]) {
2330 cfg
->fc_mp
= nla_data(tb
[RTA_MULTIPATH
]);
2331 cfg
->fc_mp_len
= nla_len(tb
[RTA_MULTIPATH
]);
2339 static int ip6_route_multipath(struct fib6_config
*cfg
, int add
)
2341 struct fib6_config r_cfg
;
2342 struct rtnexthop
*rtnh
;
2345 int err
= 0, last_err
= 0;
2348 rtnh
= (struct rtnexthop
*)cfg
->fc_mp
;
2349 remaining
= cfg
->fc_mp_len
;
2351 /* Parse a Multipath Entry */
2352 while (rtnh_ok(rtnh
, remaining
)) {
2353 memcpy(&r_cfg
, cfg
, sizeof(*cfg
));
2354 if (rtnh
->rtnh_ifindex
)
2355 r_cfg
.fc_ifindex
= rtnh
->rtnh_ifindex
;
2357 attrlen
= rtnh_attrlen(rtnh
);
2359 struct nlattr
*nla
, *attrs
= rtnh_attrs(rtnh
);
2361 nla
= nla_find(attrs
, attrlen
, RTA_GATEWAY
);
2363 nla_memcpy(&r_cfg
.fc_gateway
, nla
, 16);
2364 r_cfg
.fc_flags
|= RTF_GATEWAY
;
2367 err
= add
? ip6_route_add(&r_cfg
) : ip6_route_del(&r_cfg
);
2370 /* If we are trying to remove a route, do not stop the
2371 * loop when ip6_route_del() fails (because next hop is
2372 * already gone), we should try to remove all next hops.
2375 /* If add fails, we should try to delete all
2376 * next hops that have been already added.
2382 /* Because each route is added like a single route we remove
2383 * this flag after the first nexthop (if there is a collision,
2384 * we have already fail to add the first nexthop:
2385 * fib6_add_rt2node() has reject it).
2387 cfg
->fc_nlinfo
.nlh
->nlmsg_flags
&= ~NLM_F_EXCL
;
2388 rtnh
= rtnh_next(rtnh
, &remaining
);
2394 static int inet6_rtm_delroute(struct sk_buff
*skb
, struct nlmsghdr
* nlh
)
2396 struct fib6_config cfg
;
2399 err
= rtm_to_fib6_config(skb
, nlh
, &cfg
);
2404 return ip6_route_multipath(&cfg
, 0);
2406 return ip6_route_del(&cfg
);
2409 static int inet6_rtm_newroute(struct sk_buff
*skb
, struct nlmsghdr
* nlh
)
2411 struct fib6_config cfg
;
2414 err
= rtm_to_fib6_config(skb
, nlh
, &cfg
);
2419 return ip6_route_multipath(&cfg
, 1);
2421 return ip6_route_add(&cfg
);
2424 static inline size_t rt6_nlmsg_size(void)
2426 return NLMSG_ALIGN(sizeof(struct rtmsg
))
2427 + nla_total_size(16) /* RTA_SRC */
2428 + nla_total_size(16) /* RTA_DST */
2429 + nla_total_size(16) /* RTA_GATEWAY */
2430 + nla_total_size(16) /* RTA_PREFSRC */
2431 + nla_total_size(4) /* RTA_TABLE */
2432 + nla_total_size(4) /* RTA_IIF */
2433 + nla_total_size(4) /* RTA_OIF */
2434 + nla_total_size(4) /* RTA_PRIORITY */
2435 + RTAX_MAX
* nla_total_size(4) /* RTA_METRICS */
2436 + nla_total_size(sizeof(struct rta_cacheinfo
));
2439 static int rt6_fill_node(struct net
*net
,
2440 struct sk_buff
*skb
, struct rt6_info
*rt
,
2441 struct in6_addr
*dst
, struct in6_addr
*src
,
2442 int iif
, int type
, u32 portid
, u32 seq
,
2443 int prefix
, int nowait
, unsigned int flags
)
2446 struct nlmsghdr
*nlh
;
2450 if (prefix
) { /* user wants prefix routes only */
2451 if (!(rt
->rt6i_flags
& RTF_PREFIX_RT
)) {
2452 /* success since this is not a prefix route */
2457 nlh
= nlmsg_put(skb
, portid
, seq
, type
, sizeof(*rtm
), flags
);
2461 rtm
= nlmsg_data(nlh
);
2462 rtm
->rtm_family
= AF_INET6
;
2463 rtm
->rtm_dst_len
= rt
->rt6i_dst
.plen
;
2464 rtm
->rtm_src_len
= rt
->rt6i_src
.plen
;
2467 table
= rt
->rt6i_table
->tb6_id
;
2469 table
= RT6_TABLE_UNSPEC
;
2470 rtm
->rtm_table
= table
;
2471 if (nla_put_u32(skb
, RTA_TABLE
, table
))
2472 goto nla_put_failure
;
2473 if (rt
->rt6i_flags
& RTF_REJECT
) {
2474 switch (rt
->dst
.error
) {
2476 rtm
->rtm_type
= RTN_BLACKHOLE
;
2479 rtm
->rtm_type
= RTN_PROHIBIT
;
2482 rtm
->rtm_type
= RTN_THROW
;
2485 rtm
->rtm_type
= RTN_UNREACHABLE
;
2489 else if (rt
->rt6i_flags
& RTF_LOCAL
)
2490 rtm
->rtm_type
= RTN_LOCAL
;
2491 else if (rt
->dst
.dev
&& (rt
->dst
.dev
->flags
& IFF_LOOPBACK
))
2492 rtm
->rtm_type
= RTN_LOCAL
;
2494 rtm
->rtm_type
= RTN_UNICAST
;
2496 rtm
->rtm_scope
= RT_SCOPE_UNIVERSE
;
2497 rtm
->rtm_protocol
= rt
->rt6i_protocol
;
2498 if (rt
->rt6i_flags
& RTF_DYNAMIC
)
2499 rtm
->rtm_protocol
= RTPROT_REDIRECT
;
2500 else if (rt
->rt6i_flags
& RTF_ADDRCONF
) {
2501 if (rt
->rt6i_flags
& (RTF_DEFAULT
| RTF_ROUTEINFO
))
2502 rtm
->rtm_protocol
= RTPROT_RA
;
2504 rtm
->rtm_protocol
= RTPROT_KERNEL
;
2507 if (rt
->rt6i_flags
& RTF_CACHE
)
2508 rtm
->rtm_flags
|= RTM_F_CLONED
;
2511 if (nla_put(skb
, RTA_DST
, 16, dst
))
2512 goto nla_put_failure
;
2513 rtm
->rtm_dst_len
= 128;
2514 } else if (rtm
->rtm_dst_len
)
2515 if (nla_put(skb
, RTA_DST
, 16, &rt
->rt6i_dst
.addr
))
2516 goto nla_put_failure
;
2517 #ifdef CONFIG_IPV6_SUBTREES
2519 if (nla_put(skb
, RTA_SRC
, 16, src
))
2520 goto nla_put_failure
;
2521 rtm
->rtm_src_len
= 128;
2522 } else if (rtm
->rtm_src_len
&&
2523 nla_put(skb
, RTA_SRC
, 16, &rt
->rt6i_src
.addr
))
2524 goto nla_put_failure
;
2527 #ifdef CONFIG_IPV6_MROUTE
2528 if (ipv6_addr_is_multicast(&rt
->rt6i_dst
.addr
)) {
2529 int err
= ip6mr_get_route(net
, skb
, rtm
, nowait
,
2536 goto nla_put_failure
;
2538 if (err
== -EMSGSIZE
)
2539 goto nla_put_failure
;
2544 if (nla_put_u32(skb
, RTA_IIF
, iif
))
2545 goto nla_put_failure
;
2547 struct in6_addr saddr_buf
;
2548 if (ip6_route_get_saddr(net
, rt
, dst
, 0, &saddr_buf
) == 0 &&
2549 nla_put(skb
, RTA_PREFSRC
, 16, &saddr_buf
))
2550 goto nla_put_failure
;
2553 if (rt
->rt6i_prefsrc
.plen
) {
2554 struct in6_addr saddr_buf
;
2555 saddr_buf
= rt
->rt6i_prefsrc
.addr
;
2556 if (nla_put(skb
, RTA_PREFSRC
, 16, &saddr_buf
))
2557 goto nla_put_failure
;
2560 if (rtnetlink_put_metrics(skb
, dst_metrics_ptr(&rt
->dst
)) < 0)
2561 goto nla_put_failure
;
2563 if (rt
->rt6i_flags
& RTF_GATEWAY
) {
2564 if (nla_put(skb
, RTA_GATEWAY
, 16, &rt
->rt6i_gateway
) < 0)
2565 goto nla_put_failure
;
2569 nla_put_u32(skb
, RTA_OIF
, rt
->dst
.dev
->ifindex
))
2570 goto nla_put_failure
;
2571 if (nla_put_u32(skb
, RTA_PRIORITY
, rt
->rt6i_metric
))
2572 goto nla_put_failure
;
2574 expires
= (rt
->rt6i_flags
& RTF_EXPIRES
) ? rt
->dst
.expires
- jiffies
: 0;
2576 if (rtnl_put_cacheinfo(skb
, &rt
->dst
, 0, expires
, rt
->dst
.error
) < 0)
2577 goto nla_put_failure
;
2579 return nlmsg_end(skb
, nlh
);
2582 nlmsg_cancel(skb
, nlh
);
2586 int rt6_dump_route(struct rt6_info
*rt
, void *p_arg
)
2588 struct rt6_rtnl_dump_arg
*arg
= (struct rt6_rtnl_dump_arg
*) p_arg
;
2591 if (nlmsg_len(arg
->cb
->nlh
) >= sizeof(struct rtmsg
)) {
2592 struct rtmsg
*rtm
= nlmsg_data(arg
->cb
->nlh
);
2593 prefix
= (rtm
->rtm_flags
& RTM_F_PREFIX
) != 0;
2597 return rt6_fill_node(arg
->net
,
2598 arg
->skb
, rt
, NULL
, NULL
, 0, RTM_NEWROUTE
,
2599 NETLINK_CB(arg
->cb
->skb
).portid
, arg
->cb
->nlh
->nlmsg_seq
,
2600 prefix
, 0, NLM_F_MULTI
);
2603 static int inet6_rtm_getroute(struct sk_buff
*in_skb
, struct nlmsghdr
* nlh
)
2605 struct net
*net
= sock_net(in_skb
->sk
);
2606 struct nlattr
*tb
[RTA_MAX
+1];
2607 struct rt6_info
*rt
;
2608 struct sk_buff
*skb
;
2611 int err
, iif
= 0, oif
= 0;
2613 err
= nlmsg_parse(nlh
, sizeof(*rtm
), tb
, RTA_MAX
, rtm_ipv6_policy
);
2618 memset(&fl6
, 0, sizeof(fl6
));
2621 if (nla_len(tb
[RTA_SRC
]) < sizeof(struct in6_addr
))
2624 fl6
.saddr
= *(struct in6_addr
*)nla_data(tb
[RTA_SRC
]);
2628 if (nla_len(tb
[RTA_DST
]) < sizeof(struct in6_addr
))
2631 fl6
.daddr
= *(struct in6_addr
*)nla_data(tb
[RTA_DST
]);
2635 iif
= nla_get_u32(tb
[RTA_IIF
]);
2638 oif
= nla_get_u32(tb
[RTA_OIF
]);
2641 fl6
.flowi6_uid
= make_kuid(current_user_ns(),
2642 nla_get_u32(tb
[RTA_UID
]));
2644 fl6
.flowi6_uid
= iif
? INVALID_UID
: current_uid();
2647 struct net_device
*dev
;
2650 dev
= __dev_get_by_index(net
, iif
);
2656 fl6
.flowi6_iif
= iif
;
2658 if (!ipv6_addr_any(&fl6
.saddr
))
2659 flags
|= RT6_LOOKUP_F_HAS_SADDR
;
2661 rt
= (struct rt6_info
*)ip6_route_input_lookup(net
, dev
, &fl6
,
2664 fl6
.flowi6_oif
= oif
;
2666 rt
= (struct rt6_info
*)ip6_route_output(net
, NULL
, &fl6
);
2669 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
2676 /* Reserve room for dummy headers, this skb can pass
2677 through good chunk of routing engine.
2679 skb_reset_mac_header(skb
);
2680 skb_reserve(skb
, MAX_HEADER
+ sizeof(struct ipv6hdr
));
2682 skb_dst_set(skb
, &rt
->dst
);
2684 err
= rt6_fill_node(net
, skb
, rt
, &fl6
.daddr
, &fl6
.saddr
, iif
,
2685 RTM_NEWROUTE
, NETLINK_CB(in_skb
).portid
,
2686 nlh
->nlmsg_seq
, 0, 0, 0);
2692 err
= rtnl_unicast(skb
, net
, NETLINK_CB(in_skb
).portid
);
2697 void inet6_rt_notify(int event
, struct rt6_info
*rt
, struct nl_info
*info
)
2699 struct sk_buff
*skb
;
2700 struct net
*net
= info
->nl_net
;
2705 seq
= info
->nlh
? info
->nlh
->nlmsg_seq
: 0;
2707 skb
= nlmsg_new(rt6_nlmsg_size(), gfp_any());
2711 err
= rt6_fill_node(net
, skb
, rt
, NULL
, NULL
, 0,
2712 event
, info
->portid
, seq
, 0, 0, 0);
2714 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2715 WARN_ON(err
== -EMSGSIZE
);
2719 rtnl_notify(skb
, net
, info
->portid
, RTNLGRP_IPV6_ROUTE
,
2720 info
->nlh
, gfp_any());
2724 rtnl_set_sk_err(net
, RTNLGRP_IPV6_ROUTE
, err
);
2727 static int ip6_route_dev_notify(struct notifier_block
*this,
2728 unsigned long event
, void *data
)
2730 struct net_device
*dev
= (struct net_device
*)data
;
2731 struct net
*net
= dev_net(dev
);
2733 if (event
== NETDEV_REGISTER
&& (dev
->flags
& IFF_LOOPBACK
)) {
2734 net
->ipv6
.ip6_null_entry
->dst
.dev
= dev
;
2735 net
->ipv6
.ip6_null_entry
->rt6i_idev
= in6_dev_get(dev
);
2736 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2737 net
->ipv6
.ip6_prohibit_entry
->dst
.dev
= dev
;
2738 net
->ipv6
.ip6_prohibit_entry
->rt6i_idev
= in6_dev_get(dev
);
2739 net
->ipv6
.ip6_blk_hole_entry
->dst
.dev
= dev
;
2740 net
->ipv6
.ip6_blk_hole_entry
->rt6i_idev
= in6_dev_get(dev
);
2751 #ifdef CONFIG_PROC_FS
2762 static int rt6_info_route(struct rt6_info
*rt
, void *p_arg
)
2764 struct seq_file
*m
= p_arg
;
2766 seq_printf(m
, "%pi6 %02x ", &rt
->rt6i_dst
.addr
, rt
->rt6i_dst
.plen
);
2768 #ifdef CONFIG_IPV6_SUBTREES
2769 seq_printf(m
, "%pi6 %02x ", &rt
->rt6i_src
.addr
, rt
->rt6i_src
.plen
);
2771 seq_puts(m
, "00000000000000000000000000000000 00 ");
2773 if (rt
->rt6i_flags
& RTF_GATEWAY
) {
2774 seq_printf(m
, "%pi6", &rt
->rt6i_gateway
);
2776 seq_puts(m
, "00000000000000000000000000000000");
2778 seq_printf(m
, " %08x %08x %08x %08x %8s\n",
2779 rt
->rt6i_metric
, atomic_read(&rt
->dst
.__refcnt
),
2780 rt
->dst
.__use
, rt
->rt6i_flags
,
2781 rt
->dst
.dev
? rt
->dst
.dev
->name
: "");
2785 static int ipv6_route_show(struct seq_file
*m
, void *v
)
2787 struct net
*net
= (struct net
*)m
->private;
2788 fib6_clean_all_ro(net
, rt6_info_route
, 0, m
);
2792 static int ipv6_route_open(struct inode
*inode
, struct file
*file
)
2794 return single_open_net(inode
, file
, ipv6_route_show
);
2797 static const struct file_operations ipv6_route_proc_fops
= {
2798 .owner
= THIS_MODULE
,
2799 .open
= ipv6_route_open
,
2801 .llseek
= seq_lseek
,
2802 .release
= single_release_net
,
2805 static int rt6_stats_seq_show(struct seq_file
*seq
, void *v
)
2807 struct net
*net
= (struct net
*)seq
->private;
2808 seq_printf(seq
, "%04x %04x %04x %04x %04x %04x %04x\n",
2809 net
->ipv6
.rt6_stats
->fib_nodes
,
2810 net
->ipv6
.rt6_stats
->fib_route_nodes
,
2811 net
->ipv6
.rt6_stats
->fib_rt_alloc
,
2812 net
->ipv6
.rt6_stats
->fib_rt_entries
,
2813 net
->ipv6
.rt6_stats
->fib_rt_cache
,
2814 dst_entries_get_slow(&net
->ipv6
.ip6_dst_ops
),
2815 net
->ipv6
.rt6_stats
->fib_discarded_routes
);
2820 static int rt6_stats_seq_open(struct inode
*inode
, struct file
*file
)
2822 return single_open_net(inode
, file
, rt6_stats_seq_show
);
2825 static const struct file_operations rt6_stats_seq_fops
= {
2826 .owner
= THIS_MODULE
,
2827 .open
= rt6_stats_seq_open
,
2829 .llseek
= seq_lseek
,
2830 .release
= single_release_net
,
2832 #endif /* CONFIG_PROC_FS */
2834 #ifdef CONFIG_SYSCTL
2837 int ipv6_sysctl_rtcache_flush(ctl_table
*ctl
, int write
,
2838 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2845 net
= (struct net
*)ctl
->extra1
;
2846 delay
= net
->ipv6
.sysctl
.flush_delay
;
2847 proc_dointvec(ctl
, write
, buffer
, lenp
, ppos
);
2848 fib6_run_gc(delay
<= 0 ? 0 : (unsigned long)delay
, net
, delay
> 0);
2852 ctl_table ipv6_route_table_template
[] = {
2854 .procname
= "flush",
2855 .data
= &init_net
.ipv6
.sysctl
.flush_delay
,
2856 .maxlen
= sizeof(int),
2858 .proc_handler
= ipv6_sysctl_rtcache_flush
2861 .procname
= "gc_thresh",
2862 .data
= &ip6_dst_ops_template
.gc_thresh
,
2863 .maxlen
= sizeof(int),
2865 .proc_handler
= proc_dointvec
,
2868 .procname
= "max_size",
2869 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_max_size
,
2870 .maxlen
= sizeof(int),
2872 .proc_handler
= proc_dointvec
,
2875 .procname
= "gc_min_interval",
2876 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_min_interval
,
2877 .maxlen
= sizeof(int),
2879 .proc_handler
= proc_dointvec_jiffies
,
2882 .procname
= "gc_timeout",
2883 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_timeout
,
2884 .maxlen
= sizeof(int),
2886 .proc_handler
= proc_dointvec_jiffies
,
2889 .procname
= "gc_interval",
2890 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_interval
,
2891 .maxlen
= sizeof(int),
2893 .proc_handler
= proc_dointvec_jiffies
,
2896 .procname
= "gc_elasticity",
2897 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_elasticity
,
2898 .maxlen
= sizeof(int),
2900 .proc_handler
= proc_dointvec
,
2903 .procname
= "mtu_expires",
2904 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_mtu_expires
,
2905 .maxlen
= sizeof(int),
2907 .proc_handler
= proc_dointvec_jiffies
,
2910 .procname
= "min_adv_mss",
2911 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_min_advmss
,
2912 .maxlen
= sizeof(int),
2914 .proc_handler
= proc_dointvec
,
2917 .procname
= "gc_min_interval_ms",
2918 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_min_interval
,
2919 .maxlen
= sizeof(int),
2921 .proc_handler
= proc_dointvec_ms_jiffies
,
2926 struct ctl_table
* __net_init
ipv6_route_sysctl_init(struct net
*net
)
2928 struct ctl_table
*table
;
2930 table
= kmemdup(ipv6_route_table_template
,
2931 sizeof(ipv6_route_table_template
),
2935 table
[0].data
= &net
->ipv6
.sysctl
.flush_delay
;
2936 table
[0].extra1
= net
;
2937 table
[1].data
= &net
->ipv6
.ip6_dst_ops
.gc_thresh
;
2938 table
[2].data
= &net
->ipv6
.sysctl
.ip6_rt_max_size
;
2939 table
[3].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
;
2940 table
[4].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_timeout
;
2941 table
[5].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_interval
;
2942 table
[6].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_elasticity
;
2943 table
[7].data
= &net
->ipv6
.sysctl
.ip6_rt_mtu_expires
;
2944 table
[8].data
= &net
->ipv6
.sysctl
.ip6_rt_min_advmss
;
2945 table
[9].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
;
2947 /* Don't export sysctls to unprivileged users */
2948 if (net
->user_ns
!= &init_user_ns
)
2949 table
[0].procname
= NULL
;
2956 static int __net_init
ip6_route_net_init(struct net
*net
)
2960 memcpy(&net
->ipv6
.ip6_dst_ops
, &ip6_dst_ops_template
,
2961 sizeof(net
->ipv6
.ip6_dst_ops
));
2963 if (dst_entries_init(&net
->ipv6
.ip6_dst_ops
) < 0)
2964 goto out_ip6_dst_ops
;
2966 net
->ipv6
.ip6_null_entry
= kmemdup(&ip6_null_entry_template
,
2967 sizeof(*net
->ipv6
.ip6_null_entry
),
2969 if (!net
->ipv6
.ip6_null_entry
)
2970 goto out_ip6_dst_entries
;
2971 net
->ipv6
.ip6_null_entry
->dst
.path
=
2972 (struct dst_entry
*)net
->ipv6
.ip6_null_entry
;
2973 net
->ipv6
.ip6_null_entry
->dst
.ops
= &net
->ipv6
.ip6_dst_ops
;
2974 dst_init_metrics(&net
->ipv6
.ip6_null_entry
->dst
,
2975 ip6_template_metrics
, true);
2977 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2978 net
->ipv6
.ip6_prohibit_entry
= kmemdup(&ip6_prohibit_entry_template
,
2979 sizeof(*net
->ipv6
.ip6_prohibit_entry
),
2981 if (!net
->ipv6
.ip6_prohibit_entry
)
2982 goto out_ip6_null_entry
;
2983 net
->ipv6
.ip6_prohibit_entry
->dst
.path
=
2984 (struct dst_entry
*)net
->ipv6
.ip6_prohibit_entry
;
2985 net
->ipv6
.ip6_prohibit_entry
->dst
.ops
= &net
->ipv6
.ip6_dst_ops
;
2986 dst_init_metrics(&net
->ipv6
.ip6_prohibit_entry
->dst
,
2987 ip6_template_metrics
, true);
2989 net
->ipv6
.ip6_blk_hole_entry
= kmemdup(&ip6_blk_hole_entry_template
,
2990 sizeof(*net
->ipv6
.ip6_blk_hole_entry
),
2992 if (!net
->ipv6
.ip6_blk_hole_entry
)
2993 goto out_ip6_prohibit_entry
;
2994 net
->ipv6
.ip6_blk_hole_entry
->dst
.path
=
2995 (struct dst_entry
*)net
->ipv6
.ip6_blk_hole_entry
;
2996 net
->ipv6
.ip6_blk_hole_entry
->dst
.ops
= &net
->ipv6
.ip6_dst_ops
;
2997 dst_init_metrics(&net
->ipv6
.ip6_blk_hole_entry
->dst
,
2998 ip6_template_metrics
, true);
3001 net
->ipv6
.sysctl
.flush_delay
= 0;
3002 net
->ipv6
.sysctl
.ip6_rt_max_size
= 4096;
3003 net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
= HZ
/ 2;
3004 net
->ipv6
.sysctl
.ip6_rt_gc_timeout
= 60*HZ
;
3005 net
->ipv6
.sysctl
.ip6_rt_gc_interval
= 30*HZ
;
3006 net
->ipv6
.sysctl
.ip6_rt_gc_elasticity
= 9;
3007 net
->ipv6
.sysctl
.ip6_rt_mtu_expires
= 10*60*HZ
;
3008 net
->ipv6
.sysctl
.ip6_rt_min_advmss
= IPV6_MIN_MTU
- 20 - 40;
3010 net
->ipv6
.ip6_rt_gc_expire
= 30*HZ
;
3016 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3017 out_ip6_prohibit_entry
:
3018 kfree(net
->ipv6
.ip6_prohibit_entry
);
3020 kfree(net
->ipv6
.ip6_null_entry
);
3022 out_ip6_dst_entries
:
3023 dst_entries_destroy(&net
->ipv6
.ip6_dst_ops
);
3028 static void __net_exit
ip6_route_net_exit(struct net
*net
)
3030 kfree(net
->ipv6
.ip6_null_entry
);
3031 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3032 kfree(net
->ipv6
.ip6_prohibit_entry
);
3033 kfree(net
->ipv6
.ip6_blk_hole_entry
);
3035 dst_entries_destroy(&net
->ipv6
.ip6_dst_ops
);
3038 static int __net_init
ip6_route_net_init_late(struct net
*net
)
3040 #ifdef CONFIG_PROC_FS
3041 proc_create("ipv6_route", 0, net
->proc_net
, &ipv6_route_proc_fops
);
3042 proc_create("rt6_stats", S_IRUGO
, net
->proc_net
, &rt6_stats_seq_fops
);
3047 static void __net_exit
ip6_route_net_exit_late(struct net
*net
)
3049 #ifdef CONFIG_PROC_FS
3050 remove_proc_entry("ipv6_route", net
->proc_net
);
3051 remove_proc_entry("rt6_stats", net
->proc_net
);
3055 static struct pernet_operations ip6_route_net_ops
= {
3056 .init
= ip6_route_net_init
,
3057 .exit
= ip6_route_net_exit
,
3060 static int __net_init
ipv6_inetpeer_init(struct net
*net
)
3062 struct inet_peer_base
*bp
= kmalloc(sizeof(*bp
), GFP_KERNEL
);
3066 inet_peer_base_init(bp
);
3067 net
->ipv6
.peers
= bp
;
3071 static void __net_exit
ipv6_inetpeer_exit(struct net
*net
)
3073 struct inet_peer_base
*bp
= net
->ipv6
.peers
;
3075 net
->ipv6
.peers
= NULL
;
3076 inetpeer_invalidate_tree(bp
);
3080 static struct pernet_operations ipv6_inetpeer_ops
= {
3081 .init
= ipv6_inetpeer_init
,
3082 .exit
= ipv6_inetpeer_exit
,
3085 static struct pernet_operations ip6_route_net_late_ops
= {
3086 .init
= ip6_route_net_init_late
,
3087 .exit
= ip6_route_net_exit_late
,
3090 static struct notifier_block ip6_route_dev_notifier
= {
3091 .notifier_call
= ip6_route_dev_notify
,
3095 int __init
ip6_route_init(void)
3100 ip6_dst_ops_template
.kmem_cachep
=
3101 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info
), 0,
3102 SLAB_HWCACHE_ALIGN
, NULL
);
3103 if (!ip6_dst_ops_template
.kmem_cachep
)
3106 ret
= dst_entries_init(&ip6_dst_blackhole_ops
);
3108 goto out_kmem_cache
;
3110 ret
= register_pernet_subsys(&ipv6_inetpeer_ops
);
3112 goto out_dst_entries
;
3114 ret
= register_pernet_subsys(&ip6_route_net_ops
);
3116 goto out_register_inetpeer
;
3118 ip6_dst_blackhole_ops
.kmem_cachep
= ip6_dst_ops_template
.kmem_cachep
;
3120 /* Registering of the loopback is done before this portion of code,
3121 * the loopback reference in rt6_info will not be taken, do it
3122 * manually for init_net */
3123 init_net
.ipv6
.ip6_null_entry
->dst
.dev
= init_net
.loopback_dev
;
3124 init_net
.ipv6
.ip6_null_entry
->rt6i_idev
= in6_dev_get(init_net
.loopback_dev
);
3125 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3126 init_net
.ipv6
.ip6_prohibit_entry
->dst
.dev
= init_net
.loopback_dev
;
3127 init_net
.ipv6
.ip6_prohibit_entry
->rt6i_idev
= in6_dev_get(init_net
.loopback_dev
);
3128 init_net
.ipv6
.ip6_blk_hole_entry
->dst
.dev
= init_net
.loopback_dev
;
3129 init_net
.ipv6
.ip6_blk_hole_entry
->rt6i_idev
= in6_dev_get(init_net
.loopback_dev
);
3133 goto out_register_subsys
;
3139 ret
= fib6_rules_init();
3143 ret
= register_pernet_subsys(&ip6_route_net_late_ops
);
3145 goto fib6_rules_init
;
3148 if (__rtnl_register(PF_INET6
, RTM_NEWROUTE
, inet6_rtm_newroute
, NULL
, NULL
) ||
3149 __rtnl_register(PF_INET6
, RTM_DELROUTE
, inet6_rtm_delroute
, NULL
, NULL
) ||
3150 __rtnl_register(PF_INET6
, RTM_GETROUTE
, inet6_rtm_getroute
, NULL
, NULL
))
3151 goto out_register_late_subsys
;
3153 ret
= register_netdevice_notifier(&ip6_route_dev_notifier
);
3155 goto out_register_late_subsys
;
3160 out_register_late_subsys
:
3161 unregister_pernet_subsys(&ip6_route_net_late_ops
);
3163 fib6_rules_cleanup();
3168 out_register_subsys
:
3169 unregister_pernet_subsys(&ip6_route_net_ops
);
3170 out_register_inetpeer
:
3171 unregister_pernet_subsys(&ipv6_inetpeer_ops
);
3173 dst_entries_destroy(&ip6_dst_blackhole_ops
);
3175 kmem_cache_destroy(ip6_dst_ops_template
.kmem_cachep
);
3179 void ip6_route_cleanup(void)
3181 unregister_netdevice_notifier(&ip6_route_dev_notifier
);
3182 unregister_pernet_subsys(&ip6_route_net_late_ops
);
3183 fib6_rules_cleanup();
3186 unregister_pernet_subsys(&ipv6_inetpeer_ops
);
3187 unregister_pernet_subsys(&ip6_route_net_ops
);
3188 dst_entries_destroy(&ip6_dst_blackhole_ops
);
3189 kmem_cache_destroy(ip6_dst_ops_template
.kmem_cachep
);