2 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
24 * Fixed routing subtrees.
27 #define pr_fmt(fmt) "IPv6: " fmt
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
55 #include <linux/rtnetlink.h>
57 #include <net/dst_metadata.h>
59 #include <net/netevent.h>
60 #include <net/netlink.h>
61 #include <net/nexthop.h>
62 #include <net/lwtunnel.h>
63 #include <net/ip_tunnels.h>
65 #include <asm/uaccess.h>
68 #include <linux/sysctl.h>
72 RT6_NUD_FAIL_HARD
= -3,
73 RT6_NUD_FAIL_PROBE
= -2,
74 RT6_NUD_FAIL_DO_RR
= -1,
78 static void ip6_rt_copy_init(struct rt6_info
*rt
, struct rt6_info
*ort
);
79 static struct dst_entry
*ip6_dst_check(struct dst_entry
*dst
, u32 cookie
);
80 static unsigned int ip6_default_advmss(const struct dst_entry
*dst
);
81 static unsigned int ip6_mtu(const struct dst_entry
*dst
);
82 static struct dst_entry
*ip6_negative_advice(struct dst_entry
*);
83 static void ip6_dst_destroy(struct dst_entry
*);
84 static void ip6_dst_ifdown(struct dst_entry
*,
85 struct net_device
*dev
, int how
);
86 static int ip6_dst_gc(struct dst_ops
*ops
);
88 static int ip6_pkt_discard(struct sk_buff
*skb
);
89 static int ip6_pkt_discard_out(struct sock
*sk
, struct sk_buff
*skb
);
90 static int ip6_pkt_prohibit(struct sk_buff
*skb
);
91 static int ip6_pkt_prohibit_out(struct sock
*sk
, struct sk_buff
*skb
);
92 static void ip6_link_failure(struct sk_buff
*skb
);
93 static void ip6_rt_update_pmtu(struct dst_entry
*dst
, struct sock
*sk
,
94 struct sk_buff
*skb
, u32 mtu
);
95 static void rt6_do_redirect(struct dst_entry
*dst
, struct sock
*sk
,
97 static void rt6_dst_from_metrics_check(struct rt6_info
*rt
);
98 static int rt6_score_route(struct rt6_info
*rt
, int oif
, int strict
);
100 #ifdef CONFIG_IPV6_ROUTE_INFO
101 static struct rt6_info
*rt6_add_route_info(struct net
*net
,
102 const struct in6_addr
*prefix
, int prefixlen
,
103 const struct in6_addr
*gwaddr
, int ifindex
,
105 static struct rt6_info
*rt6_get_route_info(struct net
*net
,
106 const struct in6_addr
*prefix
, int prefixlen
,
107 const struct in6_addr
*gwaddr
, int ifindex
);
110 struct uncached_list
{
112 struct list_head head
;
115 static DEFINE_PER_CPU_ALIGNED(struct uncached_list
, rt6_uncached_list
);
117 static void rt6_uncached_list_add(struct rt6_info
*rt
)
119 struct uncached_list
*ul
= raw_cpu_ptr(&rt6_uncached_list
);
121 rt
->dst
.flags
|= DST_NOCACHE
;
122 rt
->rt6i_uncached_list
= ul
;
124 spin_lock_bh(&ul
->lock
);
125 list_add_tail(&rt
->rt6i_uncached
, &ul
->head
);
126 spin_unlock_bh(&ul
->lock
);
129 static void rt6_uncached_list_del(struct rt6_info
*rt
)
131 if (!list_empty(&rt
->rt6i_uncached
)) {
132 struct uncached_list
*ul
= rt
->rt6i_uncached_list
;
134 spin_lock_bh(&ul
->lock
);
135 list_del(&rt
->rt6i_uncached
);
136 spin_unlock_bh(&ul
->lock
);
140 static void rt6_uncached_list_flush_dev(struct net
*net
, struct net_device
*dev
)
142 struct net_device
*loopback_dev
= net
->loopback_dev
;
145 for_each_possible_cpu(cpu
) {
146 struct uncached_list
*ul
= per_cpu_ptr(&rt6_uncached_list
, cpu
);
149 spin_lock_bh(&ul
->lock
);
150 list_for_each_entry(rt
, &ul
->head
, rt6i_uncached
) {
151 struct inet6_dev
*rt_idev
= rt
->rt6i_idev
;
152 struct net_device
*rt_dev
= rt
->dst
.dev
;
154 if (rt_idev
&& (rt_idev
->dev
== dev
|| !dev
) &&
155 rt_idev
->dev
!= loopback_dev
) {
156 rt
->rt6i_idev
= in6_dev_get(loopback_dev
);
157 in6_dev_put(rt_idev
);
160 if (rt_dev
&& (rt_dev
== dev
|| !dev
) &&
161 rt_dev
!= loopback_dev
) {
162 rt
->dst
.dev
= loopback_dev
;
163 dev_hold(rt
->dst
.dev
);
167 spin_unlock_bh(&ul
->lock
);
171 static u32
*rt6_pcpu_cow_metrics(struct rt6_info
*rt
)
173 return dst_metrics_write_ptr(rt
->dst
.from
);
176 static u32
*ipv6_cow_metrics(struct dst_entry
*dst
, unsigned long old
)
178 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
180 if (rt
->rt6i_flags
& RTF_PCPU
)
181 return rt6_pcpu_cow_metrics(rt
);
182 else if (rt
->rt6i_flags
& RTF_CACHE
)
185 return dst_cow_metrics_generic(dst
, old
);
188 static inline const void *choose_neigh_daddr(struct rt6_info
*rt
,
192 struct in6_addr
*p
= &rt
->rt6i_gateway
;
194 if (!ipv6_addr_any(p
))
195 return (const void *) p
;
197 return &ipv6_hdr(skb
)->daddr
;
201 static struct neighbour
*ip6_neigh_lookup(const struct dst_entry
*dst
,
205 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
208 daddr
= choose_neigh_daddr(rt
, skb
, daddr
);
209 n
= __ipv6_neigh_lookup(dst
->dev
, daddr
);
212 return neigh_create(&nd_tbl
, daddr
, dst
->dev
);
215 static struct dst_ops ip6_dst_ops_template
= {
219 .check
= ip6_dst_check
,
220 .default_advmss
= ip6_default_advmss
,
222 .cow_metrics
= ipv6_cow_metrics
,
223 .destroy
= ip6_dst_destroy
,
224 .ifdown
= ip6_dst_ifdown
,
225 .negative_advice
= ip6_negative_advice
,
226 .link_failure
= ip6_link_failure
,
227 .update_pmtu
= ip6_rt_update_pmtu
,
228 .redirect
= rt6_do_redirect
,
229 .local_out
= __ip6_local_out
,
230 .neigh_lookup
= ip6_neigh_lookup
,
233 static unsigned int ip6_blackhole_mtu(const struct dst_entry
*dst
)
235 unsigned int mtu
= dst_metric_raw(dst
, RTAX_MTU
);
237 return mtu
? : dst
->dev
->mtu
;
240 static void ip6_rt_blackhole_update_pmtu(struct dst_entry
*dst
, struct sock
*sk
,
241 struct sk_buff
*skb
, u32 mtu
)
245 static void ip6_rt_blackhole_redirect(struct dst_entry
*dst
, struct sock
*sk
,
250 static u32
*ip6_rt_blackhole_cow_metrics(struct dst_entry
*dst
,
256 static struct dst_ops ip6_dst_blackhole_ops
= {
258 .destroy
= ip6_dst_destroy
,
259 .check
= ip6_dst_check
,
260 .mtu
= ip6_blackhole_mtu
,
261 .default_advmss
= ip6_default_advmss
,
262 .update_pmtu
= ip6_rt_blackhole_update_pmtu
,
263 .redirect
= ip6_rt_blackhole_redirect
,
264 .cow_metrics
= ip6_rt_blackhole_cow_metrics
,
265 .neigh_lookup
= ip6_neigh_lookup
,
268 static const u32 ip6_template_metrics
[RTAX_MAX
] = {
269 [RTAX_HOPLIMIT
- 1] = 0,
272 static const struct rt6_info ip6_null_entry_template
= {
274 .__refcnt
= ATOMIC_INIT(1),
276 .obsolete
= DST_OBSOLETE_FORCE_CHK
,
277 .error
= -ENETUNREACH
,
278 .input
= ip6_pkt_discard
,
279 .output
= ip6_pkt_discard_out
,
281 .rt6i_flags
= (RTF_REJECT
| RTF_NONEXTHOP
),
282 .rt6i_protocol
= RTPROT_KERNEL
,
283 .rt6i_metric
= ~(u32
) 0,
284 .rt6i_ref
= ATOMIC_INIT(1),
287 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
289 static const struct rt6_info ip6_prohibit_entry_template
= {
291 .__refcnt
= ATOMIC_INIT(1),
293 .obsolete
= DST_OBSOLETE_FORCE_CHK
,
295 .input
= ip6_pkt_prohibit
,
296 .output
= ip6_pkt_prohibit_out
,
298 .rt6i_flags
= (RTF_REJECT
| RTF_NONEXTHOP
),
299 .rt6i_protocol
= RTPROT_KERNEL
,
300 .rt6i_metric
= ~(u32
) 0,
301 .rt6i_ref
= ATOMIC_INIT(1),
304 static const struct rt6_info ip6_blk_hole_entry_template
= {
306 .__refcnt
= ATOMIC_INIT(1),
308 .obsolete
= DST_OBSOLETE_FORCE_CHK
,
310 .input
= dst_discard
,
311 .output
= dst_discard_sk
,
313 .rt6i_flags
= (RTF_REJECT
| RTF_NONEXTHOP
),
314 .rt6i_protocol
= RTPROT_KERNEL
,
315 .rt6i_metric
= ~(u32
) 0,
316 .rt6i_ref
= ATOMIC_INIT(1),
321 /* allocate dst with ip6_dst_ops */
322 static struct rt6_info
*__ip6_dst_alloc(struct net
*net
,
323 struct net_device
*dev
,
326 struct rt6_info
*rt
= dst_alloc(&net
->ipv6
.ip6_dst_ops
, dev
,
327 0, DST_OBSOLETE_FORCE_CHK
, flags
);
330 struct dst_entry
*dst
= &rt
->dst
;
332 memset(dst
+ 1, 0, sizeof(*rt
) - sizeof(*dst
));
333 INIT_LIST_HEAD(&rt
->rt6i_siblings
);
334 INIT_LIST_HEAD(&rt
->rt6i_uncached
);
339 static struct rt6_info
*ip6_dst_alloc(struct net
*net
,
340 struct net_device
*dev
,
343 struct rt6_info
*rt
= __ip6_dst_alloc(net
, dev
, flags
);
346 rt
->rt6i_pcpu
= alloc_percpu_gfp(struct rt6_info
*, GFP_ATOMIC
);
350 for_each_possible_cpu(cpu
) {
353 p
= per_cpu_ptr(rt
->rt6i_pcpu
, cpu
);
354 /* no one shares rt */
358 dst_destroy((struct dst_entry
*)rt
);
366 static void ip6_dst_destroy(struct dst_entry
*dst
)
368 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
369 struct dst_entry
*from
= dst
->from
;
370 struct inet6_dev
*idev
;
372 dst_destroy_metrics_generic(dst
);
373 free_percpu(rt
->rt6i_pcpu
);
374 rt6_uncached_list_del(rt
);
376 idev
= rt
->rt6i_idev
;
378 rt
->rt6i_idev
= NULL
;
386 static void ip6_dst_ifdown(struct dst_entry
*dst
, struct net_device
*dev
,
389 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
390 struct inet6_dev
*idev
= rt
->rt6i_idev
;
391 struct net_device
*loopback_dev
=
392 dev_net(dev
)->loopback_dev
;
394 if (dev
!= loopback_dev
) {
395 if (idev
&& idev
->dev
== dev
) {
396 struct inet6_dev
*loopback_idev
=
397 in6_dev_get(loopback_dev
);
399 rt
->rt6i_idev
= loopback_idev
;
406 static bool rt6_check_expired(const struct rt6_info
*rt
)
408 if (rt
->rt6i_flags
& RTF_EXPIRES
) {
409 if (time_after(jiffies
, rt
->dst
.expires
))
411 } else if (rt
->dst
.from
) {
412 return rt6_check_expired((struct rt6_info
*) rt
->dst
.from
);
417 /* Multipath route selection:
418 * Hash based function using packet header and flowlabel.
419 * Adapted from fib_info_hashfn()
421 static int rt6_info_hash_nhsfn(unsigned int candidate_count
,
422 const struct flowi6
*fl6
)
424 unsigned int val
= fl6
->flowi6_proto
;
426 val
^= ipv6_addr_hash(&fl6
->daddr
);
427 val
^= ipv6_addr_hash(&fl6
->saddr
);
429 /* Work only if this not encapsulated */
430 switch (fl6
->flowi6_proto
) {
434 val
^= (__force u16
)fl6
->fl6_sport
;
435 val
^= (__force u16
)fl6
->fl6_dport
;
439 val
^= (__force u16
)fl6
->fl6_icmp_type
;
440 val
^= (__force u16
)fl6
->fl6_icmp_code
;
443 /* RFC6438 recommands to use flowlabel */
444 val
^= (__force u32
)fl6
->flowlabel
;
446 /* Perhaps, we need to tune, this function? */
447 val
= val
^ (val
>> 7) ^ (val
>> 12);
448 return val
% candidate_count
;
451 static struct rt6_info
*rt6_multipath_select(struct rt6_info
*match
,
452 struct flowi6
*fl6
, int oif
,
455 struct rt6_info
*sibling
, *next_sibling
;
458 route_choosen
= rt6_info_hash_nhsfn(match
->rt6i_nsiblings
+ 1, fl6
);
459 /* Don't change the route, if route_choosen == 0
460 * (siblings does not include ourself)
463 list_for_each_entry_safe(sibling
, next_sibling
,
464 &match
->rt6i_siblings
, rt6i_siblings
) {
466 if (route_choosen
== 0) {
467 if (rt6_score_route(sibling
, oif
, strict
) < 0)
477 * Route lookup. Any table->tb6_lock is implied.
480 static inline struct rt6_info
*rt6_device_match(struct net
*net
,
482 const struct in6_addr
*saddr
,
486 struct rt6_info
*local
= NULL
;
487 struct rt6_info
*sprt
;
489 if (!oif
&& ipv6_addr_any(saddr
))
492 for (sprt
= rt
; sprt
; sprt
= sprt
->dst
.rt6_next
) {
493 struct net_device
*dev
= sprt
->dst
.dev
;
496 if (dev
->ifindex
== oif
)
498 if (dev
->flags
& IFF_LOOPBACK
) {
499 if (!sprt
->rt6i_idev
||
500 sprt
->rt6i_idev
->dev
->ifindex
!= oif
) {
501 if (flags
& RT6_LOOKUP_F_IFACE
&& oif
)
503 if (local
&& (!oif
||
504 local
->rt6i_idev
->dev
->ifindex
== oif
))
510 if (ipv6_chk_addr(net
, saddr
, dev
,
511 flags
& RT6_LOOKUP_F_IFACE
))
520 if (flags
& RT6_LOOKUP_F_IFACE
)
521 return net
->ipv6
.ip6_null_entry
;
527 #ifdef CONFIG_IPV6_ROUTER_PREF
528 struct __rt6_probe_work
{
529 struct work_struct work
;
530 struct in6_addr target
;
531 struct net_device
*dev
;
534 static void rt6_probe_deferred(struct work_struct
*w
)
536 struct in6_addr mcaddr
;
537 struct __rt6_probe_work
*work
=
538 container_of(w
, struct __rt6_probe_work
, work
);
540 addrconf_addr_solict_mult(&work
->target
, &mcaddr
);
541 ndisc_send_ns(work
->dev
, NULL
, &work
->target
, &mcaddr
, NULL
, NULL
);
546 static void rt6_probe(struct rt6_info
*rt
)
548 struct __rt6_probe_work
*work
;
549 struct neighbour
*neigh
;
551 * Okay, this does not seem to be appropriate
552 * for now, however, we need to check if it
553 * is really so; aka Router Reachability Probing.
555 * Router Reachability Probe MUST be rate-limited
556 * to no more than one per minute.
558 if (!rt
|| !(rt
->rt6i_flags
& RTF_GATEWAY
))
561 neigh
= __ipv6_neigh_lookup_noref(rt
->dst
.dev
, &rt
->rt6i_gateway
);
563 if (neigh
->nud_state
& NUD_VALID
)
567 write_lock(&neigh
->lock
);
568 if (!(neigh
->nud_state
& NUD_VALID
) &&
571 rt
->rt6i_idev
->cnf
.rtr_probe_interval
)) {
572 work
= kmalloc(sizeof(*work
), GFP_ATOMIC
);
574 __neigh_set_probe_once(neigh
);
576 write_unlock(&neigh
->lock
);
578 work
= kmalloc(sizeof(*work
), GFP_ATOMIC
);
582 INIT_WORK(&work
->work
, rt6_probe_deferred
);
583 work
->target
= rt
->rt6i_gateway
;
584 dev_hold(rt
->dst
.dev
);
585 work
->dev
= rt
->dst
.dev
;
586 schedule_work(&work
->work
);
590 rcu_read_unlock_bh();
593 static inline void rt6_probe(struct rt6_info
*rt
)
599 * Default Router Selection (RFC 2461 6.3.6)
601 static inline int rt6_check_dev(struct rt6_info
*rt
, int oif
)
603 struct net_device
*dev
= rt
->dst
.dev
;
604 if (!oif
|| dev
->ifindex
== oif
)
606 if ((dev
->flags
& IFF_LOOPBACK
) &&
607 rt
->rt6i_idev
&& rt
->rt6i_idev
->dev
->ifindex
== oif
)
612 static inline enum rt6_nud_state
rt6_check_neigh(struct rt6_info
*rt
)
614 struct neighbour
*neigh
;
615 enum rt6_nud_state ret
= RT6_NUD_FAIL_HARD
;
617 if (rt
->rt6i_flags
& RTF_NONEXTHOP
||
618 !(rt
->rt6i_flags
& RTF_GATEWAY
))
619 return RT6_NUD_SUCCEED
;
622 neigh
= __ipv6_neigh_lookup_noref(rt
->dst
.dev
, &rt
->rt6i_gateway
);
624 read_lock(&neigh
->lock
);
625 if (neigh
->nud_state
& NUD_VALID
)
626 ret
= RT6_NUD_SUCCEED
;
627 #ifdef CONFIG_IPV6_ROUTER_PREF
628 else if (!(neigh
->nud_state
& NUD_FAILED
))
629 ret
= RT6_NUD_SUCCEED
;
631 ret
= RT6_NUD_FAIL_PROBE
;
633 read_unlock(&neigh
->lock
);
635 ret
= IS_ENABLED(CONFIG_IPV6_ROUTER_PREF
) ?
636 RT6_NUD_SUCCEED
: RT6_NUD_FAIL_DO_RR
;
638 rcu_read_unlock_bh();
643 static int rt6_score_route(struct rt6_info
*rt
, int oif
,
648 m
= rt6_check_dev(rt
, oif
);
649 if (!m
&& (strict
& RT6_LOOKUP_F_IFACE
))
650 return RT6_NUD_FAIL_HARD
;
651 #ifdef CONFIG_IPV6_ROUTER_PREF
652 m
|= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt
->rt6i_flags
)) << 2;
654 if (strict
& RT6_LOOKUP_F_REACHABLE
) {
655 int n
= rt6_check_neigh(rt
);
662 static struct rt6_info
*find_match(struct rt6_info
*rt
, int oif
, int strict
,
663 int *mpri
, struct rt6_info
*match
,
667 bool match_do_rr
= false;
668 struct inet6_dev
*idev
= rt
->rt6i_idev
;
669 struct net_device
*dev
= rt
->dst
.dev
;
671 if (dev
&& !netif_carrier_ok(dev
) &&
672 idev
->cnf
.ignore_routes_with_linkdown
)
675 if (rt6_check_expired(rt
))
678 m
= rt6_score_route(rt
, oif
, strict
);
679 if (m
== RT6_NUD_FAIL_DO_RR
) {
681 m
= 0; /* lowest valid score */
682 } else if (m
== RT6_NUD_FAIL_HARD
) {
686 if (strict
& RT6_LOOKUP_F_REACHABLE
)
689 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
691 *do_rr
= match_do_rr
;
699 static struct rt6_info
*find_rr_leaf(struct fib6_node
*fn
,
700 struct rt6_info
*rr_head
,
701 u32 metric
, int oif
, int strict
,
704 struct rt6_info
*rt
, *match
, *cont
;
709 for (rt
= rr_head
; rt
; rt
= rt
->dst
.rt6_next
) {
710 if (rt
->rt6i_metric
!= metric
) {
715 match
= find_match(rt
, oif
, strict
, &mpri
, match
, do_rr
);
718 for (rt
= fn
->leaf
; rt
&& rt
!= rr_head
; rt
= rt
->dst
.rt6_next
) {
719 if (rt
->rt6i_metric
!= metric
) {
724 match
= find_match(rt
, oif
, strict
, &mpri
, match
, do_rr
);
730 for (rt
= cont
; rt
; rt
= rt
->dst
.rt6_next
)
731 match
= find_match(rt
, oif
, strict
, &mpri
, match
, do_rr
);
736 static struct rt6_info
*rt6_select(struct fib6_node
*fn
, int oif
, int strict
)
738 struct rt6_info
*match
, *rt0
;
744 fn
->rr_ptr
= rt0
= fn
->leaf
;
746 match
= find_rr_leaf(fn
, rt0
, rt0
->rt6i_metric
, oif
, strict
,
750 struct rt6_info
*next
= rt0
->dst
.rt6_next
;
752 /* no entries matched; do round-robin */
753 if (!next
|| next
->rt6i_metric
!= rt0
->rt6i_metric
)
760 net
= dev_net(rt0
->dst
.dev
);
761 return match
? match
: net
->ipv6
.ip6_null_entry
;
764 static bool rt6_is_gw_or_nonexthop(const struct rt6_info
*rt
)
766 return (rt
->rt6i_flags
& (RTF_NONEXTHOP
| RTF_GATEWAY
));
769 #ifdef CONFIG_IPV6_ROUTE_INFO
770 int rt6_route_rcv(struct net_device
*dev
, u8
*opt
, int len
,
771 const struct in6_addr
*gwaddr
)
773 struct net
*net
= dev_net(dev
);
774 struct route_info
*rinfo
= (struct route_info
*) opt
;
775 struct in6_addr prefix_buf
, *prefix
;
777 unsigned long lifetime
;
780 if (len
< sizeof(struct route_info
)) {
784 /* Sanity check for prefix_len and length */
785 if (rinfo
->length
> 3) {
787 } else if (rinfo
->prefix_len
> 128) {
789 } else if (rinfo
->prefix_len
> 64) {
790 if (rinfo
->length
< 2) {
793 } else if (rinfo
->prefix_len
> 0) {
794 if (rinfo
->length
< 1) {
799 pref
= rinfo
->route_pref
;
800 if (pref
== ICMPV6_ROUTER_PREF_INVALID
)
803 lifetime
= addrconf_timeout_fixup(ntohl(rinfo
->lifetime
), HZ
);
805 if (rinfo
->length
== 3)
806 prefix
= (struct in6_addr
*)rinfo
->prefix
;
808 /* this function is safe */
809 ipv6_addr_prefix(&prefix_buf
,
810 (struct in6_addr
*)rinfo
->prefix
,
812 prefix
= &prefix_buf
;
815 if (rinfo
->prefix_len
== 0)
816 rt
= rt6_get_dflt_router(gwaddr
, dev
);
818 rt
= rt6_get_route_info(net
, prefix
, rinfo
->prefix_len
,
819 gwaddr
, dev
->ifindex
);
821 if (rt
&& !lifetime
) {
827 rt
= rt6_add_route_info(net
, prefix
, rinfo
->prefix_len
, gwaddr
, dev
->ifindex
,
830 rt
->rt6i_flags
= RTF_ROUTEINFO
|
831 (rt
->rt6i_flags
& ~RTF_PREF_MASK
) | RTF_PREF(pref
);
834 if (!addrconf_finite_timeout(lifetime
))
835 rt6_clean_expires(rt
);
837 rt6_set_expires(rt
, jiffies
+ HZ
* lifetime
);
845 static struct fib6_node
* fib6_backtrack(struct fib6_node
*fn
,
846 struct in6_addr
*saddr
)
848 struct fib6_node
*pn
;
850 if (fn
->fn_flags
& RTN_TL_ROOT
)
853 if (FIB6_SUBTREE(pn
) && FIB6_SUBTREE(pn
) != fn
)
854 fn
= fib6_lookup(FIB6_SUBTREE(pn
), NULL
, saddr
);
857 if (fn
->fn_flags
& RTN_RTINFO
)
862 static struct rt6_info
*ip6_pol_route_lookup(struct net
*net
,
863 struct fib6_table
*table
,
864 struct flowi6
*fl6
, int flags
)
866 struct fib6_node
*fn
;
869 read_lock_bh(&table
->tb6_lock
);
870 fn
= fib6_lookup(&table
->tb6_root
, &fl6
->daddr
, &fl6
->saddr
);
873 rt
= rt6_device_match(net
, rt
, &fl6
->saddr
, fl6
->flowi6_oif
, flags
);
874 if (rt
->rt6i_nsiblings
&& fl6
->flowi6_oif
== 0)
875 rt
= rt6_multipath_select(rt
, fl6
, fl6
->flowi6_oif
, flags
);
876 if (rt
== net
->ipv6
.ip6_null_entry
) {
877 fn
= fib6_backtrack(fn
, &fl6
->saddr
);
881 dst_use(&rt
->dst
, jiffies
);
882 read_unlock_bh(&table
->tb6_lock
);
887 struct dst_entry
*ip6_route_lookup(struct net
*net
, struct flowi6
*fl6
,
890 return fib6_rule_lookup(net
, fl6
, flags
, ip6_pol_route_lookup
);
892 EXPORT_SYMBOL_GPL(ip6_route_lookup
);
894 struct rt6_info
*rt6_lookup(struct net
*net
, const struct in6_addr
*daddr
,
895 const struct in6_addr
*saddr
, int oif
, int strict
)
897 struct flowi6 fl6
= {
901 struct dst_entry
*dst
;
902 int flags
= strict
? RT6_LOOKUP_F_IFACE
: 0;
905 memcpy(&fl6
.saddr
, saddr
, sizeof(*saddr
));
906 flags
|= RT6_LOOKUP_F_HAS_SADDR
;
909 dst
= fib6_rule_lookup(net
, &fl6
, flags
, ip6_pol_route_lookup
);
911 return (struct rt6_info
*) dst
;
917 EXPORT_SYMBOL(rt6_lookup
);
919 /* ip6_ins_rt is called with FREE table->tb6_lock.
920 It takes new route entry, the addition fails by any reason the
921 route is freed. In any case, if caller does not hold it, it may
925 static int __ip6_ins_rt(struct rt6_info
*rt
, struct nl_info
*info
,
926 struct mx6_config
*mxc
)
929 struct fib6_table
*table
;
931 table
= rt
->rt6i_table
;
932 write_lock_bh(&table
->tb6_lock
);
933 err
= fib6_add(&table
->tb6_root
, rt
, info
, mxc
);
934 write_unlock_bh(&table
->tb6_lock
);
939 int ip6_ins_rt(struct rt6_info
*rt
)
941 struct nl_info info
= { .nl_net
= dev_net(rt
->dst
.dev
), };
942 struct mx6_config mxc
= { .mx
= NULL
, };
944 return __ip6_ins_rt(rt
, &info
, &mxc
);
947 static struct rt6_info
*ip6_rt_cache_alloc(struct rt6_info
*ort
,
948 const struct in6_addr
*daddr
,
949 const struct in6_addr
*saddr
)
957 if (ort
->rt6i_flags
& (RTF_CACHE
| RTF_PCPU
))
958 ort
= (struct rt6_info
*)ort
->dst
.from
;
960 rt
= __ip6_dst_alloc(dev_net(ort
->dst
.dev
), ort
->dst
.dev
, 0);
965 ip6_rt_copy_init(rt
, ort
);
966 rt
->rt6i_flags
|= RTF_CACHE
;
968 rt
->dst
.flags
|= DST_HOST
;
969 rt
->rt6i_dst
.addr
= *daddr
;
970 rt
->rt6i_dst
.plen
= 128;
972 if (!rt6_is_gw_or_nonexthop(ort
)) {
973 if (ort
->rt6i_dst
.plen
!= 128 &&
974 ipv6_addr_equal(&ort
->rt6i_dst
.addr
, daddr
))
975 rt
->rt6i_flags
|= RTF_ANYCAST
;
976 #ifdef CONFIG_IPV6_SUBTREES
977 if (rt
->rt6i_src
.plen
&& saddr
) {
978 rt
->rt6i_src
.addr
= *saddr
;
979 rt
->rt6i_src
.plen
= 128;
987 static struct rt6_info
*ip6_rt_pcpu_alloc(struct rt6_info
*rt
)
989 struct rt6_info
*pcpu_rt
;
991 pcpu_rt
= __ip6_dst_alloc(dev_net(rt
->dst
.dev
),
992 rt
->dst
.dev
, rt
->dst
.flags
);
996 ip6_rt_copy_init(pcpu_rt
, rt
);
997 pcpu_rt
->rt6i_protocol
= rt
->rt6i_protocol
;
998 pcpu_rt
->rt6i_flags
|= RTF_PCPU
;
1002 /* It should be called with read_lock_bh(&tb6_lock) acquired */
1003 static struct rt6_info
*rt6_get_pcpu_route(struct rt6_info
*rt
)
1005 struct rt6_info
*pcpu_rt
, **p
;
1007 p
= this_cpu_ptr(rt
->rt6i_pcpu
);
1011 dst_hold(&pcpu_rt
->dst
);
1012 rt6_dst_from_metrics_check(pcpu_rt
);
1017 static struct rt6_info
*rt6_make_pcpu_route(struct rt6_info
*rt
)
1019 struct fib6_table
*table
= rt
->rt6i_table
;
1020 struct rt6_info
*pcpu_rt
, *prev
, **p
;
1022 pcpu_rt
= ip6_rt_pcpu_alloc(rt
);
1024 struct net
*net
= dev_net(rt
->dst
.dev
);
1026 dst_hold(&net
->ipv6
.ip6_null_entry
->dst
);
1027 return net
->ipv6
.ip6_null_entry
;
1030 read_lock_bh(&table
->tb6_lock
);
1031 if (rt
->rt6i_pcpu
) {
1032 p
= this_cpu_ptr(rt
->rt6i_pcpu
);
1033 prev
= cmpxchg(p
, NULL
, pcpu_rt
);
1035 /* If someone did it before us, return prev instead */
1036 dst_destroy(&pcpu_rt
->dst
);
1040 /* rt has been removed from the fib6 tree
1041 * before we have a chance to acquire the read_lock.
1042 * In this case, don't brother to create a pcpu rt
1043 * since rt is going away anyway. The next
1044 * dst_check() will trigger a re-lookup.
1046 dst_destroy(&pcpu_rt
->dst
);
1049 dst_hold(&pcpu_rt
->dst
);
1050 rt6_dst_from_metrics_check(pcpu_rt
);
1051 read_unlock_bh(&table
->tb6_lock
);
1055 static struct rt6_info
*ip6_pol_route(struct net
*net
, struct fib6_table
*table
, int oif
,
1056 struct flowi6
*fl6
, int flags
)
1058 struct fib6_node
*fn
, *saved_fn
;
1059 struct rt6_info
*rt
;
1062 strict
|= flags
& RT6_LOOKUP_F_IFACE
;
1063 if (net
->ipv6
.devconf_all
->forwarding
== 0)
1064 strict
|= RT6_LOOKUP_F_REACHABLE
;
1066 read_lock_bh(&table
->tb6_lock
);
1068 fn
= fib6_lookup(&table
->tb6_root
, &fl6
->daddr
, &fl6
->saddr
);
1072 rt
= rt6_select(fn
, oif
, strict
);
1073 if (rt
->rt6i_nsiblings
)
1074 rt
= rt6_multipath_select(rt
, fl6
, oif
, strict
);
1075 if (rt
== net
->ipv6
.ip6_null_entry
) {
1076 fn
= fib6_backtrack(fn
, &fl6
->saddr
);
1078 goto redo_rt6_select
;
1079 else if (strict
& RT6_LOOKUP_F_REACHABLE
) {
1080 /* also consider unreachable route */
1081 strict
&= ~RT6_LOOKUP_F_REACHABLE
;
1083 goto redo_rt6_select
;
1088 if (rt
== net
->ipv6
.ip6_null_entry
|| (rt
->rt6i_flags
& RTF_CACHE
)) {
1089 dst_use(&rt
->dst
, jiffies
);
1090 read_unlock_bh(&table
->tb6_lock
);
1092 rt6_dst_from_metrics_check(rt
);
1094 } else if (unlikely((fl6
->flowi6_flags
& FLOWI_FLAG_KNOWN_NH
) &&
1095 !(rt
->rt6i_flags
& RTF_GATEWAY
))) {
1096 /* Create a RTF_CACHE clone which will not be
1097 * owned by the fib6 tree. It is for the special case where
1098 * the daddr in the skb during the neighbor look-up is different
1099 * from the fl6->daddr used to look-up route here.
1102 struct rt6_info
*uncached_rt
;
1104 dst_use(&rt
->dst
, jiffies
);
1105 read_unlock_bh(&table
->tb6_lock
);
1107 uncached_rt
= ip6_rt_cache_alloc(rt
, &fl6
->daddr
, NULL
);
1108 dst_release(&rt
->dst
);
1111 rt6_uncached_list_add(uncached_rt
);
1113 uncached_rt
= net
->ipv6
.ip6_null_entry
;
1115 dst_hold(&uncached_rt
->dst
);
1119 /* Get a percpu copy */
1121 struct rt6_info
*pcpu_rt
;
1123 rt
->dst
.lastuse
= jiffies
;
1125 pcpu_rt
= rt6_get_pcpu_route(rt
);
1128 read_unlock_bh(&table
->tb6_lock
);
1130 /* We have to do the read_unlock first
1131 * because rt6_make_pcpu_route() may trigger
1132 * ip6_dst_gc() which will take the write_lock.
1135 read_unlock_bh(&table
->tb6_lock
);
1136 pcpu_rt
= rt6_make_pcpu_route(rt
);
1137 dst_release(&rt
->dst
);
1145 static struct rt6_info
*ip6_pol_route_input(struct net
*net
, struct fib6_table
*table
,
1146 struct flowi6
*fl6
, int flags
)
1148 return ip6_pol_route(net
, table
, fl6
->flowi6_iif
, fl6
, flags
);
1151 static struct dst_entry
*ip6_route_input_lookup(struct net
*net
,
1152 struct net_device
*dev
,
1153 struct flowi6
*fl6
, int flags
)
1155 if (rt6_need_strict(&fl6
->daddr
) && dev
->type
!= ARPHRD_PIMREG
)
1156 flags
|= RT6_LOOKUP_F_IFACE
;
1158 return fib6_rule_lookup(net
, fl6
, flags
, ip6_pol_route_input
);
1161 void ip6_route_input(struct sk_buff
*skb
)
1163 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
1164 struct net
*net
= dev_net(skb
->dev
);
1165 int flags
= RT6_LOOKUP_F_HAS_SADDR
;
1166 struct ip_tunnel_info
*tun_info
;
1167 struct flowi6 fl6
= {
1168 .flowi6_iif
= skb
->dev
->ifindex
,
1169 .daddr
= iph
->daddr
,
1170 .saddr
= iph
->saddr
,
1171 .flowlabel
= ip6_flowinfo(iph
),
1172 .flowi6_mark
= skb
->mark
,
1173 .flowi6_proto
= iph
->nexthdr
,
1176 tun_info
= skb_tunnel_info(skb
);
1177 if (tun_info
&& !(tun_info
->mode
& IP_TUNNEL_INFO_TX
))
1178 fl6
.flowi6_tun_key
.tun_id
= tun_info
->key
.tun_id
;
1180 skb_dst_set(skb
, ip6_route_input_lookup(net
, skb
->dev
, &fl6
, flags
));
1183 static struct rt6_info
*ip6_pol_route_output(struct net
*net
, struct fib6_table
*table
,
1184 struct flowi6
*fl6
, int flags
)
1186 return ip6_pol_route(net
, table
, fl6
->flowi6_oif
, fl6
, flags
);
1189 struct dst_entry
*ip6_route_output(struct net
*net
, const struct sock
*sk
,
1194 fl6
->flowi6_iif
= LOOPBACK_IFINDEX
;
1196 if ((sk
&& sk
->sk_bound_dev_if
) || rt6_need_strict(&fl6
->daddr
))
1197 flags
|= RT6_LOOKUP_F_IFACE
;
1199 if (!ipv6_addr_any(&fl6
->saddr
))
1200 flags
|= RT6_LOOKUP_F_HAS_SADDR
;
1202 flags
|= rt6_srcprefs2flags(inet6_sk(sk
)->srcprefs
);
1204 return fib6_rule_lookup(net
, fl6
, flags
, ip6_pol_route_output
);
1206 EXPORT_SYMBOL(ip6_route_output
);
1208 struct dst_entry
*ip6_blackhole_route(struct net
*net
, struct dst_entry
*dst_orig
)
1210 struct rt6_info
*rt
, *ort
= (struct rt6_info
*) dst_orig
;
1211 struct dst_entry
*new = NULL
;
1213 rt
= dst_alloc(&ip6_dst_blackhole_ops
, ort
->dst
.dev
, 1, DST_OBSOLETE_NONE
, 0);
1217 memset(new + 1, 0, sizeof(*rt
) - sizeof(*new));
1220 new->input
= dst_discard
;
1221 new->output
= dst_discard_sk
;
1223 if (dst_metrics_read_only(&ort
->dst
))
1224 new->_metrics
= ort
->dst
._metrics
;
1226 dst_copy_metrics(new, &ort
->dst
);
1227 rt
->rt6i_idev
= ort
->rt6i_idev
;
1229 in6_dev_hold(rt
->rt6i_idev
);
1231 rt
->rt6i_gateway
= ort
->rt6i_gateway
;
1232 rt
->rt6i_flags
= ort
->rt6i_flags
;
1233 rt
->rt6i_metric
= 0;
1235 memcpy(&rt
->rt6i_dst
, &ort
->rt6i_dst
, sizeof(struct rt6key
));
1236 #ifdef CONFIG_IPV6_SUBTREES
1237 memcpy(&rt
->rt6i_src
, &ort
->rt6i_src
, sizeof(struct rt6key
));
1243 dst_release(dst_orig
);
1244 return new ? new : ERR_PTR(-ENOMEM
);
1248 * Destination cache support functions
1251 static void rt6_dst_from_metrics_check(struct rt6_info
*rt
)
1254 dst_metrics_ptr(&rt
->dst
) != dst_metrics_ptr(rt
->dst
.from
))
1255 dst_init_metrics(&rt
->dst
, dst_metrics_ptr(rt
->dst
.from
), true);
1258 static struct dst_entry
*rt6_check(struct rt6_info
*rt
, u32 cookie
)
1260 if (!rt
->rt6i_node
|| (rt
->rt6i_node
->fn_sernum
!= cookie
))
1263 if (rt6_check_expired(rt
))
1269 static struct dst_entry
*rt6_dst_from_check(struct rt6_info
*rt
, u32 cookie
)
1271 if (rt
->dst
.obsolete
== DST_OBSOLETE_FORCE_CHK
&&
1272 rt6_check((struct rt6_info
*)(rt
->dst
.from
), cookie
))
1278 static struct dst_entry
*ip6_dst_check(struct dst_entry
*dst
, u32 cookie
)
1280 struct rt6_info
*rt
;
1282 rt
= (struct rt6_info
*) dst
;
1284 /* All IPV6 dsts are created with ->obsolete set to the value
1285 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1286 * into this function always.
1289 rt6_dst_from_metrics_check(rt
);
1291 if ((rt
->rt6i_flags
& RTF_PCPU
) || unlikely(dst
->flags
& DST_NOCACHE
))
1292 return rt6_dst_from_check(rt
, cookie
);
1294 return rt6_check(rt
, cookie
);
1297 static struct dst_entry
*ip6_negative_advice(struct dst_entry
*dst
)
1299 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
1302 if (rt
->rt6i_flags
& RTF_CACHE
) {
1303 if (rt6_check_expired(rt
)) {
1315 static void ip6_link_failure(struct sk_buff
*skb
)
1317 struct rt6_info
*rt
;
1319 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_ADDR_UNREACH
, 0);
1321 rt
= (struct rt6_info
*) skb_dst(skb
);
1323 if (rt
->rt6i_flags
& RTF_CACHE
) {
1327 } else if (rt
->rt6i_node
&& (rt
->rt6i_flags
& RTF_DEFAULT
)) {
1328 rt
->rt6i_node
->fn_sernum
= -1;
1333 static void rt6_do_update_pmtu(struct rt6_info
*rt
, u32 mtu
)
1335 struct net
*net
= dev_net(rt
->dst
.dev
);
1337 rt
->rt6i_flags
|= RTF_MODIFIED
;
1338 rt
->rt6i_pmtu
= mtu
;
1339 rt6_update_expires(rt
, net
->ipv6
.sysctl
.ip6_rt_mtu_expires
);
1342 static void __ip6_rt_update_pmtu(struct dst_entry
*dst
, const struct sock
*sk
,
1343 const struct ipv6hdr
*iph
, u32 mtu
)
1345 struct rt6_info
*rt6
= (struct rt6_info
*)dst
;
1347 if (rt6
->rt6i_flags
& RTF_LOCAL
)
1351 mtu
= max_t(u32
, mtu
, IPV6_MIN_MTU
);
1352 if (mtu
>= dst_mtu(dst
))
1355 if (rt6
->rt6i_flags
& RTF_CACHE
) {
1356 rt6_do_update_pmtu(rt6
, mtu
);
1358 const struct in6_addr
*daddr
, *saddr
;
1359 struct rt6_info
*nrt6
;
1362 daddr
= &iph
->daddr
;
1363 saddr
= &iph
->saddr
;
1365 daddr
= &sk
->sk_v6_daddr
;
1366 saddr
= &inet6_sk(sk
)->saddr
;
1370 nrt6
= ip6_rt_cache_alloc(rt6
, daddr
, saddr
);
1372 rt6_do_update_pmtu(nrt6
, mtu
);
1374 /* ip6_ins_rt(nrt6) will bump the
1375 * rt6->rt6i_node->fn_sernum
1376 * which will fail the next rt6_check() and
1377 * invalidate the sk->sk_dst_cache.
1384 static void ip6_rt_update_pmtu(struct dst_entry
*dst
, struct sock
*sk
,
1385 struct sk_buff
*skb
, u32 mtu
)
1387 __ip6_rt_update_pmtu(dst
, sk
, skb
? ipv6_hdr(skb
) : NULL
, mtu
);
1390 void ip6_update_pmtu(struct sk_buff
*skb
, struct net
*net
, __be32 mtu
,
1393 const struct ipv6hdr
*iph
= (struct ipv6hdr
*) skb
->data
;
1394 struct dst_entry
*dst
;
1397 memset(&fl6
, 0, sizeof(fl6
));
1398 fl6
.flowi6_oif
= oif
;
1399 fl6
.flowi6_mark
= mark
? mark
: IP6_REPLY_MARK(net
, skb
->mark
);
1400 fl6
.daddr
= iph
->daddr
;
1401 fl6
.saddr
= iph
->saddr
;
1402 fl6
.flowlabel
= ip6_flowinfo(iph
);
1404 dst
= ip6_route_output(net
, NULL
, &fl6
);
1406 __ip6_rt_update_pmtu(dst
, NULL
, iph
, ntohl(mtu
));
1409 EXPORT_SYMBOL_GPL(ip6_update_pmtu
);
1411 void ip6_sk_update_pmtu(struct sk_buff
*skb
, struct sock
*sk
, __be32 mtu
)
1413 ip6_update_pmtu(skb
, sock_net(sk
), mtu
,
1414 sk
->sk_bound_dev_if
, sk
->sk_mark
);
1416 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu
);
1418 /* Handle redirects */
1419 struct ip6rd_flowi
{
1421 struct in6_addr gateway
;
1424 static struct rt6_info
*__ip6_route_redirect(struct net
*net
,
1425 struct fib6_table
*table
,
1429 struct ip6rd_flowi
*rdfl
= (struct ip6rd_flowi
*)fl6
;
1430 struct rt6_info
*rt
;
1431 struct fib6_node
*fn
;
1433 /* Get the "current" route for this destination and
1434 * check if the redirect has come from approriate router.
1436 * RFC 4861 specifies that redirects should only be
1437 * accepted if they come from the nexthop to the target.
1438 * Due to the way the routes are chosen, this notion
1439 * is a bit fuzzy and one might need to check all possible
1443 read_lock_bh(&table
->tb6_lock
);
1444 fn
= fib6_lookup(&table
->tb6_root
, &fl6
->daddr
, &fl6
->saddr
);
1446 for (rt
= fn
->leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
1447 if (rt6_check_expired(rt
))
1451 if (!(rt
->rt6i_flags
& RTF_GATEWAY
))
1453 if (fl6
->flowi6_oif
!= rt
->dst
.dev
->ifindex
)
1455 if (!ipv6_addr_equal(&rdfl
->gateway
, &rt
->rt6i_gateway
))
1461 rt
= net
->ipv6
.ip6_null_entry
;
1462 else if (rt
->dst
.error
) {
1463 rt
= net
->ipv6
.ip6_null_entry
;
1467 if (rt
== net
->ipv6
.ip6_null_entry
) {
1468 fn
= fib6_backtrack(fn
, &fl6
->saddr
);
1476 read_unlock_bh(&table
->tb6_lock
);
1481 static struct dst_entry
*ip6_route_redirect(struct net
*net
,
1482 const struct flowi6
*fl6
,
1483 const struct in6_addr
*gateway
)
1485 int flags
= RT6_LOOKUP_F_HAS_SADDR
;
1486 struct ip6rd_flowi rdfl
;
1489 rdfl
.gateway
= *gateway
;
1491 return fib6_rule_lookup(net
, &rdfl
.fl6
,
1492 flags
, __ip6_route_redirect
);
1495 void ip6_redirect(struct sk_buff
*skb
, struct net
*net
, int oif
, u32 mark
)
1497 const struct ipv6hdr
*iph
= (struct ipv6hdr
*) skb
->data
;
1498 struct dst_entry
*dst
;
1501 memset(&fl6
, 0, sizeof(fl6
));
1502 fl6
.flowi6_iif
= LOOPBACK_IFINDEX
;
1503 fl6
.flowi6_oif
= oif
;
1504 fl6
.flowi6_mark
= mark
;
1505 fl6
.daddr
= iph
->daddr
;
1506 fl6
.saddr
= iph
->saddr
;
1507 fl6
.flowlabel
= ip6_flowinfo(iph
);
1509 dst
= ip6_route_redirect(net
, &fl6
, &ipv6_hdr(skb
)->saddr
);
1510 rt6_do_redirect(dst
, NULL
, skb
);
1513 EXPORT_SYMBOL_GPL(ip6_redirect
);
1515 void ip6_redirect_no_header(struct sk_buff
*skb
, struct net
*net
, int oif
,
1518 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
1519 const struct rd_msg
*msg
= (struct rd_msg
*)icmp6_hdr(skb
);
1520 struct dst_entry
*dst
;
1523 memset(&fl6
, 0, sizeof(fl6
));
1524 fl6
.flowi6_iif
= LOOPBACK_IFINDEX
;
1525 fl6
.flowi6_oif
= oif
;
1526 fl6
.flowi6_mark
= mark
;
1527 fl6
.daddr
= msg
->dest
;
1528 fl6
.saddr
= iph
->daddr
;
1530 dst
= ip6_route_redirect(net
, &fl6
, &iph
->saddr
);
1531 rt6_do_redirect(dst
, NULL
, skb
);
1535 void ip6_sk_redirect(struct sk_buff
*skb
, struct sock
*sk
)
1537 ip6_redirect(skb
, sock_net(sk
), sk
->sk_bound_dev_if
, sk
->sk_mark
);
1539 EXPORT_SYMBOL_GPL(ip6_sk_redirect
);
1541 static unsigned int ip6_default_advmss(const struct dst_entry
*dst
)
1543 struct net_device
*dev
= dst
->dev
;
1544 unsigned int mtu
= dst_mtu(dst
);
1545 struct net
*net
= dev_net(dev
);
1547 mtu
-= sizeof(struct ipv6hdr
) + sizeof(struct tcphdr
);
1549 if (mtu
< net
->ipv6
.sysctl
.ip6_rt_min_advmss
)
1550 mtu
= net
->ipv6
.sysctl
.ip6_rt_min_advmss
;
1553 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1554 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1555 * IPV6_MAXPLEN is also valid and means: "any MSS,
1556 * rely only on pmtu discovery"
1558 if (mtu
> IPV6_MAXPLEN
- sizeof(struct tcphdr
))
1563 static unsigned int ip6_mtu(const struct dst_entry
*dst
)
1565 const struct rt6_info
*rt
= (const struct rt6_info
*)dst
;
1566 unsigned int mtu
= rt
->rt6i_pmtu
;
1567 struct inet6_dev
*idev
;
1572 mtu
= dst_metric_raw(dst
, RTAX_MTU
);
1579 idev
= __in6_dev_get(dst
->dev
);
1581 mtu
= idev
->cnf
.mtu6
;
1585 return min_t(unsigned int, mtu
, IP6_MAX_MTU
);
1588 static struct dst_entry
*icmp6_dst_gc_list
;
1589 static DEFINE_SPINLOCK(icmp6_dst_lock
);
1591 struct dst_entry
*icmp6_dst_alloc(struct net_device
*dev
,
1594 struct dst_entry
*dst
;
1595 struct rt6_info
*rt
;
1596 struct inet6_dev
*idev
= in6_dev_get(dev
);
1597 struct net
*net
= dev_net(dev
);
1599 if (unlikely(!idev
))
1600 return ERR_PTR(-ENODEV
);
1602 rt
= ip6_dst_alloc(net
, dev
, 0);
1603 if (unlikely(!rt
)) {
1605 dst
= ERR_PTR(-ENOMEM
);
1609 rt
->dst
.flags
|= DST_HOST
;
1610 rt
->dst
.output
= ip6_output
;
1611 atomic_set(&rt
->dst
.__refcnt
, 1);
1612 rt
->rt6i_gateway
= fl6
->daddr
;
1613 rt
->rt6i_dst
.addr
= fl6
->daddr
;
1614 rt
->rt6i_dst
.plen
= 128;
1615 rt
->rt6i_idev
= idev
;
1616 dst_metric_set(&rt
->dst
, RTAX_HOPLIMIT
, 0);
1618 spin_lock_bh(&icmp6_dst_lock
);
1619 rt
->dst
.next
= icmp6_dst_gc_list
;
1620 icmp6_dst_gc_list
= &rt
->dst
;
1621 spin_unlock_bh(&icmp6_dst_lock
);
1623 fib6_force_start_gc(net
);
1625 dst
= xfrm_lookup(net
, &rt
->dst
, flowi6_to_flowi(fl6
), NULL
, 0);
1631 int icmp6_dst_gc(void)
1633 struct dst_entry
*dst
, **pprev
;
1636 spin_lock_bh(&icmp6_dst_lock
);
1637 pprev
= &icmp6_dst_gc_list
;
1639 while ((dst
= *pprev
) != NULL
) {
1640 if (!atomic_read(&dst
->__refcnt
)) {
1649 spin_unlock_bh(&icmp6_dst_lock
);
1654 static void icmp6_clean_all(int (*func
)(struct rt6_info
*rt
, void *arg
),
1657 struct dst_entry
*dst
, **pprev
;
1659 spin_lock_bh(&icmp6_dst_lock
);
1660 pprev
= &icmp6_dst_gc_list
;
1661 while ((dst
= *pprev
) != NULL
) {
1662 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
1663 if (func(rt
, arg
)) {
1670 spin_unlock_bh(&icmp6_dst_lock
);
1673 static int ip6_dst_gc(struct dst_ops
*ops
)
1675 struct net
*net
= container_of(ops
, struct net
, ipv6
.ip6_dst_ops
);
1676 int rt_min_interval
= net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
;
1677 int rt_max_size
= net
->ipv6
.sysctl
.ip6_rt_max_size
;
1678 int rt_elasticity
= net
->ipv6
.sysctl
.ip6_rt_gc_elasticity
;
1679 int rt_gc_timeout
= net
->ipv6
.sysctl
.ip6_rt_gc_timeout
;
1680 unsigned long rt_last_gc
= net
->ipv6
.ip6_rt_last_gc
;
1683 entries
= dst_entries_get_fast(ops
);
1684 if (time_after(rt_last_gc
+ rt_min_interval
, jiffies
) &&
1685 entries
<= rt_max_size
)
1688 net
->ipv6
.ip6_rt_gc_expire
++;
1689 fib6_run_gc(net
->ipv6
.ip6_rt_gc_expire
, net
, true);
1690 entries
= dst_entries_get_slow(ops
);
1691 if (entries
< ops
->gc_thresh
)
1692 net
->ipv6
.ip6_rt_gc_expire
= rt_gc_timeout
>>1;
1694 net
->ipv6
.ip6_rt_gc_expire
-= net
->ipv6
.ip6_rt_gc_expire
>>rt_elasticity
;
1695 return entries
> rt_max_size
;
1698 static int ip6_convert_metrics(struct mx6_config
*mxc
,
1699 const struct fib6_config
*cfg
)
1708 mp
= kzalloc(sizeof(u32
) * RTAX_MAX
, GFP_KERNEL
);
1712 nla_for_each_attr(nla
, cfg
->fc_mx
, cfg
->fc_mx_len
, remaining
) {
1713 int type
= nla_type(nla
);
1718 if (unlikely(type
> RTAX_MAX
))
1721 if (type
== RTAX_CC_ALGO
) {
1722 char tmp
[TCP_CA_NAME_MAX
];
1724 nla_strlcpy(tmp
, nla
, sizeof(tmp
));
1725 val
= tcp_ca_get_key_by_name(tmp
);
1726 if (val
== TCP_CA_UNSPEC
)
1729 val
= nla_get_u32(nla
);
1731 if (type
== RTAX_FEATURES
&& (val
& ~RTAX_FEATURE_MASK
))
1735 __set_bit(type
- 1, mxc
->mx_valid
);
1746 int ip6_route_add(struct fib6_config
*cfg
)
1749 struct net
*net
= cfg
->fc_nlinfo
.nl_net
;
1750 struct rt6_info
*rt
= NULL
;
1751 struct net_device
*dev
= NULL
;
1752 struct inet6_dev
*idev
= NULL
;
1753 struct fib6_table
*table
;
1754 struct mx6_config mxc
= { .mx
= NULL
, };
1757 if (cfg
->fc_dst_len
> 128 || cfg
->fc_src_len
> 128)
1759 #ifndef CONFIG_IPV6_SUBTREES
1760 if (cfg
->fc_src_len
)
1763 if (cfg
->fc_ifindex
) {
1765 dev
= dev_get_by_index(net
, cfg
->fc_ifindex
);
1768 idev
= in6_dev_get(dev
);
1773 if (cfg
->fc_metric
== 0)
1774 cfg
->fc_metric
= IP6_RT_PRIO_USER
;
1777 if (cfg
->fc_nlinfo
.nlh
&&
1778 !(cfg
->fc_nlinfo
.nlh
->nlmsg_flags
& NLM_F_CREATE
)) {
1779 table
= fib6_get_table(net
, cfg
->fc_table
);
1781 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1782 table
= fib6_new_table(net
, cfg
->fc_table
);
1785 table
= fib6_new_table(net
, cfg
->fc_table
);
1791 rt
= ip6_dst_alloc(net
, NULL
,
1792 (cfg
->fc_flags
& RTF_ADDRCONF
) ? 0 : DST_NOCOUNT
);
1799 if (cfg
->fc_flags
& RTF_EXPIRES
)
1800 rt6_set_expires(rt
, jiffies
+
1801 clock_t_to_jiffies(cfg
->fc_expires
));
1803 rt6_clean_expires(rt
);
1805 if (cfg
->fc_protocol
== RTPROT_UNSPEC
)
1806 cfg
->fc_protocol
= RTPROT_BOOT
;
1807 rt
->rt6i_protocol
= cfg
->fc_protocol
;
1809 addr_type
= ipv6_addr_type(&cfg
->fc_dst
);
1811 if (addr_type
& IPV6_ADDR_MULTICAST
)
1812 rt
->dst
.input
= ip6_mc_input
;
1813 else if (cfg
->fc_flags
& RTF_LOCAL
)
1814 rt
->dst
.input
= ip6_input
;
1816 rt
->dst
.input
= ip6_forward
;
1818 rt
->dst
.output
= ip6_output
;
1820 if (cfg
->fc_encap
) {
1821 struct lwtunnel_state
*lwtstate
;
1823 err
= lwtunnel_build_state(dev
, cfg
->fc_encap_type
,
1824 cfg
->fc_encap
, AF_INET6
, cfg
,
1828 rt
->dst
.lwtstate
= lwtstate_get(lwtstate
);
1829 if (lwtunnel_output_redirect(rt
->dst
.lwtstate
)) {
1830 rt
->dst
.lwtstate
->orig_output
= rt
->dst
.output
;
1831 rt
->dst
.output
= lwtunnel_output
;
1833 if (lwtunnel_input_redirect(rt
->dst
.lwtstate
)) {
1834 rt
->dst
.lwtstate
->orig_input
= rt
->dst
.input
;
1835 rt
->dst
.input
= lwtunnel_input
;
1839 ipv6_addr_prefix(&rt
->rt6i_dst
.addr
, &cfg
->fc_dst
, cfg
->fc_dst_len
);
1840 rt
->rt6i_dst
.plen
= cfg
->fc_dst_len
;
1841 if (rt
->rt6i_dst
.plen
== 128)
1842 rt
->dst
.flags
|= DST_HOST
;
1844 #ifdef CONFIG_IPV6_SUBTREES
1845 ipv6_addr_prefix(&rt
->rt6i_src
.addr
, &cfg
->fc_src
, cfg
->fc_src_len
);
1846 rt
->rt6i_src
.plen
= cfg
->fc_src_len
;
1849 rt
->rt6i_metric
= cfg
->fc_metric
;
1851 /* We cannot add true routes via loopback here,
1852 they would result in kernel looping; promote them to reject routes
1854 if ((cfg
->fc_flags
& RTF_REJECT
) ||
1855 (dev
&& (dev
->flags
& IFF_LOOPBACK
) &&
1856 !(addr_type
& IPV6_ADDR_LOOPBACK
) &&
1857 !(cfg
->fc_flags
& RTF_LOCAL
))) {
1858 /* hold loopback dev/idev if we haven't done so. */
1859 if (dev
!= net
->loopback_dev
) {
1864 dev
= net
->loopback_dev
;
1866 idev
= in6_dev_get(dev
);
1872 rt
->rt6i_flags
= RTF_REJECT
|RTF_NONEXTHOP
;
1873 switch (cfg
->fc_type
) {
1875 rt
->dst
.error
= -EINVAL
;
1876 rt
->dst
.output
= dst_discard_sk
;
1877 rt
->dst
.input
= dst_discard
;
1880 rt
->dst
.error
= -EACCES
;
1881 rt
->dst
.output
= ip6_pkt_prohibit_out
;
1882 rt
->dst
.input
= ip6_pkt_prohibit
;
1886 rt
->dst
.error
= (cfg
->fc_type
== RTN_THROW
) ? -EAGAIN
1888 rt
->dst
.output
= ip6_pkt_discard_out
;
1889 rt
->dst
.input
= ip6_pkt_discard
;
1895 if (cfg
->fc_flags
& RTF_GATEWAY
) {
1896 const struct in6_addr
*gw_addr
;
1899 gw_addr
= &cfg
->fc_gateway
;
1900 gwa_type
= ipv6_addr_type(gw_addr
);
1902 /* if gw_addr is local we will fail to detect this in case
1903 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1904 * will return already-added prefix route via interface that
1905 * prefix route was assigned to, which might be non-loopback.
1908 if (ipv6_chk_addr_and_flags(net
, gw_addr
,
1909 gwa_type
& IPV6_ADDR_LINKLOCAL
?
1913 rt
->rt6i_gateway
= *gw_addr
;
1915 if (gwa_type
!= (IPV6_ADDR_LINKLOCAL
|IPV6_ADDR_UNICAST
)) {
1916 struct rt6_info
*grt
;
1918 /* IPv6 strictly inhibits using not link-local
1919 addresses as nexthop address.
1920 Otherwise, router will not able to send redirects.
1921 It is very good, but in some (rare!) circumstances
1922 (SIT, PtP, NBMA NOARP links) it is handy to allow
1923 some exceptions. --ANK
1925 if (!(gwa_type
& IPV6_ADDR_UNICAST
))
1928 grt
= rt6_lookup(net
, gw_addr
, NULL
, cfg
->fc_ifindex
, 1);
1930 err
= -EHOSTUNREACH
;
1934 if (dev
!= grt
->dst
.dev
) {
1940 idev
= grt
->rt6i_idev
;
1942 in6_dev_hold(grt
->rt6i_idev
);
1944 if (!(grt
->rt6i_flags
& RTF_GATEWAY
))
1952 if (!dev
|| (dev
->flags
& IFF_LOOPBACK
))
1960 if (!ipv6_addr_any(&cfg
->fc_prefsrc
)) {
1961 if (!ipv6_chk_addr(net
, &cfg
->fc_prefsrc
, dev
, 0)) {
1965 rt
->rt6i_prefsrc
.addr
= cfg
->fc_prefsrc
;
1966 rt
->rt6i_prefsrc
.plen
= 128;
1968 rt
->rt6i_prefsrc
.plen
= 0;
1970 rt
->rt6i_flags
= cfg
->fc_flags
;
1974 rt
->rt6i_idev
= idev
;
1975 rt
->rt6i_table
= table
;
1977 cfg
->fc_nlinfo
.nl_net
= dev_net(dev
);
1979 err
= ip6_convert_metrics(&mxc
, cfg
);
1983 err
= __ip6_ins_rt(rt
, &cfg
->fc_nlinfo
, &mxc
);
1997 static int __ip6_del_rt(struct rt6_info
*rt
, struct nl_info
*info
)
2000 struct fib6_table
*table
;
2001 struct net
*net
= dev_net(rt
->dst
.dev
);
2003 if (rt
== net
->ipv6
.ip6_null_entry
) {
2008 table
= rt
->rt6i_table
;
2009 write_lock_bh(&table
->tb6_lock
);
2010 err
= fib6_del(rt
, info
);
2011 write_unlock_bh(&table
->tb6_lock
);
2018 int ip6_del_rt(struct rt6_info
*rt
)
2020 struct nl_info info
= {
2021 .nl_net
= dev_net(rt
->dst
.dev
),
2023 return __ip6_del_rt(rt
, &info
);
2026 static int ip6_route_del(struct fib6_config
*cfg
)
2028 struct fib6_table
*table
;
2029 struct fib6_node
*fn
;
2030 struct rt6_info
*rt
;
2033 table
= fib6_get_table(cfg
->fc_nlinfo
.nl_net
, cfg
->fc_table
);
2037 read_lock_bh(&table
->tb6_lock
);
2039 fn
= fib6_locate(&table
->tb6_root
,
2040 &cfg
->fc_dst
, cfg
->fc_dst_len
,
2041 &cfg
->fc_src
, cfg
->fc_src_len
);
2044 for (rt
= fn
->leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
2045 if ((rt
->rt6i_flags
& RTF_CACHE
) &&
2046 !(cfg
->fc_flags
& RTF_CACHE
))
2048 if (cfg
->fc_ifindex
&&
2050 rt
->dst
.dev
->ifindex
!= cfg
->fc_ifindex
))
2052 if (cfg
->fc_flags
& RTF_GATEWAY
&&
2053 !ipv6_addr_equal(&cfg
->fc_gateway
, &rt
->rt6i_gateway
))
2055 if (cfg
->fc_metric
&& cfg
->fc_metric
!= rt
->rt6i_metric
)
2058 read_unlock_bh(&table
->tb6_lock
);
2060 return __ip6_del_rt(rt
, &cfg
->fc_nlinfo
);
2063 read_unlock_bh(&table
->tb6_lock
);
2068 static void rt6_do_redirect(struct dst_entry
*dst
, struct sock
*sk
, struct sk_buff
*skb
)
2070 struct net
*net
= dev_net(skb
->dev
);
2071 struct netevent_redirect netevent
;
2072 struct rt6_info
*rt
, *nrt
= NULL
;
2073 struct ndisc_options ndopts
;
2074 struct inet6_dev
*in6_dev
;
2075 struct neighbour
*neigh
;
2077 int optlen
, on_link
;
2080 optlen
= skb_tail_pointer(skb
) - skb_transport_header(skb
);
2081 optlen
-= sizeof(*msg
);
2084 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2088 msg
= (struct rd_msg
*)icmp6_hdr(skb
);
2090 if (ipv6_addr_is_multicast(&msg
->dest
)) {
2091 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2096 if (ipv6_addr_equal(&msg
->dest
, &msg
->target
)) {
2098 } else if (ipv6_addr_type(&msg
->target
) !=
2099 (IPV6_ADDR_UNICAST
|IPV6_ADDR_LINKLOCAL
)) {
2100 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2104 in6_dev
= __in6_dev_get(skb
->dev
);
2107 if (in6_dev
->cnf
.forwarding
|| !in6_dev
->cnf
.accept_redirects
)
2111 * The IP source address of the Redirect MUST be the same as the current
2112 * first-hop router for the specified ICMP Destination Address.
2115 if (!ndisc_parse_options(msg
->opt
, optlen
, &ndopts
)) {
2116 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2121 if (ndopts
.nd_opts_tgt_lladdr
) {
2122 lladdr
= ndisc_opt_addr_data(ndopts
.nd_opts_tgt_lladdr
,
2125 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2130 rt
= (struct rt6_info
*) dst
;
2131 if (rt
== net
->ipv6
.ip6_null_entry
) {
2132 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2136 /* Redirect received -> path was valid.
2137 * Look, redirects are sent only in response to data packets,
2138 * so that this nexthop apparently is reachable. --ANK
2140 dst_confirm(&rt
->dst
);
2142 neigh
= __neigh_lookup(&nd_tbl
, &msg
->target
, skb
->dev
, 1);
2147 * We have finally decided to accept it.
2150 neigh_update(neigh
, lladdr
, NUD_STALE
,
2151 NEIGH_UPDATE_F_WEAK_OVERRIDE
|
2152 NEIGH_UPDATE_F_OVERRIDE
|
2153 (on_link
? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER
|
2154 NEIGH_UPDATE_F_ISROUTER
))
2157 nrt
= ip6_rt_cache_alloc(rt
, &msg
->dest
, NULL
);
2161 nrt
->rt6i_flags
= RTF_GATEWAY
|RTF_UP
|RTF_DYNAMIC
|RTF_CACHE
;
2163 nrt
->rt6i_flags
&= ~RTF_GATEWAY
;
2165 nrt
->rt6i_gateway
= *(struct in6_addr
*)neigh
->primary_key
;
2167 if (ip6_ins_rt(nrt
))
2170 netevent
.old
= &rt
->dst
;
2171 netevent
.new = &nrt
->dst
;
2172 netevent
.daddr
= &msg
->dest
;
2173 netevent
.neigh
= neigh
;
2174 call_netevent_notifiers(NETEVENT_REDIRECT
, &netevent
);
2176 if (rt
->rt6i_flags
& RTF_CACHE
) {
2177 rt
= (struct rt6_info
*) dst_clone(&rt
->dst
);
2182 neigh_release(neigh
);
2186 * Misc support functions
2189 static void rt6_set_from(struct rt6_info
*rt
, struct rt6_info
*from
)
2191 BUG_ON(from
->dst
.from
);
2193 rt
->rt6i_flags
&= ~RTF_EXPIRES
;
2194 dst_hold(&from
->dst
);
2195 rt
->dst
.from
= &from
->dst
;
2196 dst_init_metrics(&rt
->dst
, dst_metrics_ptr(&from
->dst
), true);
2199 static void ip6_rt_copy_init(struct rt6_info
*rt
, struct rt6_info
*ort
)
2201 rt
->dst
.input
= ort
->dst
.input
;
2202 rt
->dst
.output
= ort
->dst
.output
;
2203 rt
->rt6i_dst
= ort
->rt6i_dst
;
2204 rt
->dst
.error
= ort
->dst
.error
;
2205 rt
->rt6i_idev
= ort
->rt6i_idev
;
2207 in6_dev_hold(rt
->rt6i_idev
);
2208 rt
->dst
.lastuse
= jiffies
;
2209 rt
->rt6i_gateway
= ort
->rt6i_gateway
;
2210 rt
->rt6i_flags
= ort
->rt6i_flags
;
2211 rt6_set_from(rt
, ort
);
2212 rt
->rt6i_metric
= ort
->rt6i_metric
;
2213 #ifdef CONFIG_IPV6_SUBTREES
2214 rt
->rt6i_src
= ort
->rt6i_src
;
2216 rt
->rt6i_prefsrc
= ort
->rt6i_prefsrc
;
2217 rt
->rt6i_table
= ort
->rt6i_table
;
2218 rt
->dst
.lwtstate
= lwtstate_get(ort
->dst
.lwtstate
);
2221 #ifdef CONFIG_IPV6_ROUTE_INFO
2222 static struct rt6_info
*rt6_get_route_info(struct net
*net
,
2223 const struct in6_addr
*prefix
, int prefixlen
,
2224 const struct in6_addr
*gwaddr
, int ifindex
)
2226 struct fib6_node
*fn
;
2227 struct rt6_info
*rt
= NULL
;
2228 struct fib6_table
*table
;
2230 table
= fib6_get_table(net
, RT6_TABLE_INFO
);
2234 read_lock_bh(&table
->tb6_lock
);
2235 fn
= fib6_locate(&table
->tb6_root
, prefix
, prefixlen
, NULL
, 0);
2239 for (rt
= fn
->leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
2240 if (rt
->dst
.dev
->ifindex
!= ifindex
)
2242 if ((rt
->rt6i_flags
& (RTF_ROUTEINFO
|RTF_GATEWAY
)) != (RTF_ROUTEINFO
|RTF_GATEWAY
))
2244 if (!ipv6_addr_equal(&rt
->rt6i_gateway
, gwaddr
))
2250 read_unlock_bh(&table
->tb6_lock
);
2254 static struct rt6_info
*rt6_add_route_info(struct net
*net
,
2255 const struct in6_addr
*prefix
, int prefixlen
,
2256 const struct in6_addr
*gwaddr
, int ifindex
,
2259 struct fib6_config cfg
= {
2260 .fc_table
= RT6_TABLE_INFO
,
2261 .fc_metric
= IP6_RT_PRIO_USER
,
2262 .fc_ifindex
= ifindex
,
2263 .fc_dst_len
= prefixlen
,
2264 .fc_flags
= RTF_GATEWAY
| RTF_ADDRCONF
| RTF_ROUTEINFO
|
2265 RTF_UP
| RTF_PREF(pref
),
2266 .fc_nlinfo
.portid
= 0,
2267 .fc_nlinfo
.nlh
= NULL
,
2268 .fc_nlinfo
.nl_net
= net
,
2271 cfg
.fc_dst
= *prefix
;
2272 cfg
.fc_gateway
= *gwaddr
;
2274 /* We should treat it as a default route if prefix length is 0. */
2276 cfg
.fc_flags
|= RTF_DEFAULT
;
2278 ip6_route_add(&cfg
);
2280 return rt6_get_route_info(net
, prefix
, prefixlen
, gwaddr
, ifindex
);
2284 struct rt6_info
*rt6_get_dflt_router(const struct in6_addr
*addr
, struct net_device
*dev
)
2286 struct rt6_info
*rt
;
2287 struct fib6_table
*table
;
2289 table
= fib6_get_table(dev_net(dev
), RT6_TABLE_DFLT
);
2293 read_lock_bh(&table
->tb6_lock
);
2294 for (rt
= table
->tb6_root
.leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
2295 if (dev
== rt
->dst
.dev
&&
2296 ((rt
->rt6i_flags
& (RTF_ADDRCONF
| RTF_DEFAULT
)) == (RTF_ADDRCONF
| RTF_DEFAULT
)) &&
2297 ipv6_addr_equal(&rt
->rt6i_gateway
, addr
))
2302 read_unlock_bh(&table
->tb6_lock
);
2306 struct rt6_info
*rt6_add_dflt_router(const struct in6_addr
*gwaddr
,
2307 struct net_device
*dev
,
2310 struct fib6_config cfg
= {
2311 .fc_table
= RT6_TABLE_DFLT
,
2312 .fc_metric
= IP6_RT_PRIO_USER
,
2313 .fc_ifindex
= dev
->ifindex
,
2314 .fc_flags
= RTF_GATEWAY
| RTF_ADDRCONF
| RTF_DEFAULT
|
2315 RTF_UP
| RTF_EXPIRES
| RTF_PREF(pref
),
2316 .fc_nlinfo
.portid
= 0,
2317 .fc_nlinfo
.nlh
= NULL
,
2318 .fc_nlinfo
.nl_net
= dev_net(dev
),
2321 cfg
.fc_gateway
= *gwaddr
;
2323 ip6_route_add(&cfg
);
2325 return rt6_get_dflt_router(gwaddr
, dev
);
2328 void rt6_purge_dflt_routers(struct net
*net
)
2330 struct rt6_info
*rt
;
2331 struct fib6_table
*table
;
2333 /* NOTE: Keep consistent with rt6_get_dflt_router */
2334 table
= fib6_get_table(net
, RT6_TABLE_DFLT
);
2339 read_lock_bh(&table
->tb6_lock
);
2340 for (rt
= table
->tb6_root
.leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
2341 if (rt
->rt6i_flags
& (RTF_DEFAULT
| RTF_ADDRCONF
) &&
2342 (!rt
->rt6i_idev
|| rt
->rt6i_idev
->cnf
.accept_ra
!= 2)) {
2344 read_unlock_bh(&table
->tb6_lock
);
2349 read_unlock_bh(&table
->tb6_lock
);
2352 static void rtmsg_to_fib6_config(struct net
*net
,
2353 struct in6_rtmsg
*rtmsg
,
2354 struct fib6_config
*cfg
)
2356 memset(cfg
, 0, sizeof(*cfg
));
2358 cfg
->fc_table
= RT6_TABLE_MAIN
;
2359 cfg
->fc_ifindex
= rtmsg
->rtmsg_ifindex
;
2360 cfg
->fc_metric
= rtmsg
->rtmsg_metric
;
2361 cfg
->fc_expires
= rtmsg
->rtmsg_info
;
2362 cfg
->fc_dst_len
= rtmsg
->rtmsg_dst_len
;
2363 cfg
->fc_src_len
= rtmsg
->rtmsg_src_len
;
2364 cfg
->fc_flags
= rtmsg
->rtmsg_flags
;
2366 cfg
->fc_nlinfo
.nl_net
= net
;
2368 cfg
->fc_dst
= rtmsg
->rtmsg_dst
;
2369 cfg
->fc_src
= rtmsg
->rtmsg_src
;
2370 cfg
->fc_gateway
= rtmsg
->rtmsg_gateway
;
2373 int ipv6_route_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
2375 struct fib6_config cfg
;
2376 struct in6_rtmsg rtmsg
;
2380 case SIOCADDRT
: /* Add a route */
2381 case SIOCDELRT
: /* Delete a route */
2382 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
2384 err
= copy_from_user(&rtmsg
, arg
,
2385 sizeof(struct in6_rtmsg
));
2389 rtmsg_to_fib6_config(net
, &rtmsg
, &cfg
);
2394 err
= ip6_route_add(&cfg
);
2397 err
= ip6_route_del(&cfg
);
2411 * Drop the packet on the floor
2414 static int ip6_pkt_drop(struct sk_buff
*skb
, u8 code
, int ipstats_mib_noroutes
)
2417 struct dst_entry
*dst
= skb_dst(skb
);
2418 switch (ipstats_mib_noroutes
) {
2419 case IPSTATS_MIB_INNOROUTES
:
2420 type
= ipv6_addr_type(&ipv6_hdr(skb
)->daddr
);
2421 if (type
== IPV6_ADDR_ANY
) {
2422 IP6_INC_STATS(dev_net(dst
->dev
), ip6_dst_idev(dst
),
2423 IPSTATS_MIB_INADDRERRORS
);
2427 case IPSTATS_MIB_OUTNOROUTES
:
2428 IP6_INC_STATS(dev_net(dst
->dev
), ip6_dst_idev(dst
),
2429 ipstats_mib_noroutes
);
2432 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, code
, 0);
2437 static int ip6_pkt_discard(struct sk_buff
*skb
)
2439 return ip6_pkt_drop(skb
, ICMPV6_NOROUTE
, IPSTATS_MIB_INNOROUTES
);
2442 static int ip6_pkt_discard_out(struct sock
*sk
, struct sk_buff
*skb
)
2444 skb
->dev
= skb_dst(skb
)->dev
;
2445 return ip6_pkt_drop(skb
, ICMPV6_NOROUTE
, IPSTATS_MIB_OUTNOROUTES
);
2448 static int ip6_pkt_prohibit(struct sk_buff
*skb
)
2450 return ip6_pkt_drop(skb
, ICMPV6_ADM_PROHIBITED
, IPSTATS_MIB_INNOROUTES
);
2453 static int ip6_pkt_prohibit_out(struct sock
*sk
, struct sk_buff
*skb
)
2455 skb
->dev
= skb_dst(skb
)->dev
;
2456 return ip6_pkt_drop(skb
, ICMPV6_ADM_PROHIBITED
, IPSTATS_MIB_OUTNOROUTES
);
2460 * Allocate a dst for local (unicast / anycast) address.
2463 struct rt6_info
*addrconf_dst_alloc(struct inet6_dev
*idev
,
2464 const struct in6_addr
*addr
,
2467 struct net
*net
= dev_net(idev
->dev
);
2468 struct rt6_info
*rt
= ip6_dst_alloc(net
, net
->loopback_dev
,
2471 return ERR_PTR(-ENOMEM
);
2475 rt
->dst
.flags
|= DST_HOST
;
2476 rt
->dst
.input
= ip6_input
;
2477 rt
->dst
.output
= ip6_output
;
2478 rt
->rt6i_idev
= idev
;
2480 rt
->rt6i_flags
= RTF_UP
| RTF_NONEXTHOP
;
2482 rt
->rt6i_flags
|= RTF_ANYCAST
;
2484 rt
->rt6i_flags
|= RTF_LOCAL
;
2486 rt
->rt6i_gateway
= *addr
;
2487 rt
->rt6i_dst
.addr
= *addr
;
2488 rt
->rt6i_dst
.plen
= 128;
2489 rt
->rt6i_table
= fib6_get_table(net
, RT6_TABLE_LOCAL
);
2491 atomic_set(&rt
->dst
.__refcnt
, 1);
2496 int ip6_route_get_saddr(struct net
*net
,
2497 struct rt6_info
*rt
,
2498 const struct in6_addr
*daddr
,
2500 struct in6_addr
*saddr
)
2502 struct inet6_dev
*idev
=
2503 rt
? ip6_dst_idev((struct dst_entry
*)rt
) : NULL
;
2505 if (rt
&& rt
->rt6i_prefsrc
.plen
)
2506 *saddr
= rt
->rt6i_prefsrc
.addr
;
2508 err
= ipv6_dev_get_saddr(net
, idev
? idev
->dev
: NULL
,
2509 daddr
, prefs
, saddr
);
2513 /* remove deleted ip from prefsrc entries */
2514 struct arg_dev_net_ip
{
2515 struct net_device
*dev
;
2517 struct in6_addr
*addr
;
2520 static int fib6_remove_prefsrc(struct rt6_info
*rt
, void *arg
)
2522 struct net_device
*dev
= ((struct arg_dev_net_ip
*)arg
)->dev
;
2523 struct net
*net
= ((struct arg_dev_net_ip
*)arg
)->net
;
2524 struct in6_addr
*addr
= ((struct arg_dev_net_ip
*)arg
)->addr
;
2526 if (((void *)rt
->dst
.dev
== dev
|| !dev
) &&
2527 rt
!= net
->ipv6
.ip6_null_entry
&&
2528 ipv6_addr_equal(addr
, &rt
->rt6i_prefsrc
.addr
)) {
2529 /* remove prefsrc entry */
2530 rt
->rt6i_prefsrc
.plen
= 0;
2535 void rt6_remove_prefsrc(struct inet6_ifaddr
*ifp
)
2537 struct net
*net
= dev_net(ifp
->idev
->dev
);
2538 struct arg_dev_net_ip adni
= {
2539 .dev
= ifp
->idev
->dev
,
2543 fib6_clean_all(net
, fib6_remove_prefsrc
, &adni
);
2546 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2547 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2549 /* Remove routers and update dst entries when gateway turn into host. */
2550 static int fib6_clean_tohost(struct rt6_info
*rt
, void *arg
)
2552 struct in6_addr
*gateway
= (struct in6_addr
*)arg
;
2554 if ((((rt
->rt6i_flags
& RTF_RA_ROUTER
) == RTF_RA_ROUTER
) ||
2555 ((rt
->rt6i_flags
& RTF_CACHE_GATEWAY
) == RTF_CACHE_GATEWAY
)) &&
2556 ipv6_addr_equal(gateway
, &rt
->rt6i_gateway
)) {
2562 void rt6_clean_tohost(struct net
*net
, struct in6_addr
*gateway
)
2564 fib6_clean_all(net
, fib6_clean_tohost
, gateway
);
2567 struct arg_dev_net
{
2568 struct net_device
*dev
;
2572 static int fib6_ifdown(struct rt6_info
*rt
, void *arg
)
2574 const struct arg_dev_net
*adn
= arg
;
2575 const struct net_device
*dev
= adn
->dev
;
2577 if ((rt
->dst
.dev
== dev
|| !dev
) &&
2578 rt
!= adn
->net
->ipv6
.ip6_null_entry
)
2584 void rt6_ifdown(struct net
*net
, struct net_device
*dev
)
2586 struct arg_dev_net adn
= {
2591 fib6_clean_all(net
, fib6_ifdown
, &adn
);
2592 icmp6_clean_all(fib6_ifdown
, &adn
);
2593 rt6_uncached_list_flush_dev(net
, dev
);
2596 struct rt6_mtu_change_arg
{
2597 struct net_device
*dev
;
2601 static int rt6_mtu_change_route(struct rt6_info
*rt
, void *p_arg
)
2603 struct rt6_mtu_change_arg
*arg
= (struct rt6_mtu_change_arg
*) p_arg
;
2604 struct inet6_dev
*idev
;
2606 /* In IPv6 pmtu discovery is not optional,
2607 so that RTAX_MTU lock cannot disable it.
2608 We still use this lock to block changes
2609 caused by addrconf/ndisc.
2612 idev
= __in6_dev_get(arg
->dev
);
2616 /* For administrative MTU increase, there is no way to discover
2617 IPv6 PMTU increase, so PMTU increase should be updated here.
2618 Since RFC 1981 doesn't include administrative MTU increase
2619 update PMTU increase is a MUST. (i.e. jumbo frame)
2622 If new MTU is less than route PMTU, this new MTU will be the
2623 lowest MTU in the path, update the route PMTU to reflect PMTU
2624 decreases; if new MTU is greater than route PMTU, and the
2625 old MTU is the lowest MTU in the path, update the route PMTU
2626 to reflect the increase. In this case if the other nodes' MTU
2627 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2630 if (rt
->dst
.dev
== arg
->dev
&&
2631 !dst_metric_locked(&rt
->dst
, RTAX_MTU
)) {
2632 if (rt
->rt6i_flags
& RTF_CACHE
) {
2633 /* For RTF_CACHE with rt6i_pmtu == 0
2634 * (i.e. a redirected route),
2635 * the metrics of its rt->dst.from has already
2638 if (rt
->rt6i_pmtu
&& rt
->rt6i_pmtu
> arg
->mtu
)
2639 rt
->rt6i_pmtu
= arg
->mtu
;
2640 } else if (dst_mtu(&rt
->dst
) >= arg
->mtu
||
2641 (dst_mtu(&rt
->dst
) < arg
->mtu
&&
2642 dst_mtu(&rt
->dst
) == idev
->cnf
.mtu6
)) {
2643 dst_metric_set(&rt
->dst
, RTAX_MTU
, arg
->mtu
);
2649 void rt6_mtu_change(struct net_device
*dev
, unsigned int mtu
)
2651 struct rt6_mtu_change_arg arg
= {
2656 fib6_clean_all(dev_net(dev
), rt6_mtu_change_route
, &arg
);
2659 static const struct nla_policy rtm_ipv6_policy
[RTA_MAX
+1] = {
2660 [RTA_GATEWAY
] = { .len
= sizeof(struct in6_addr
) },
2661 [RTA_OIF
] = { .type
= NLA_U32
},
2662 [RTA_IIF
] = { .type
= NLA_U32
},
2663 [RTA_PRIORITY
] = { .type
= NLA_U32
},
2664 [RTA_METRICS
] = { .type
= NLA_NESTED
},
2665 [RTA_MULTIPATH
] = { .len
= sizeof(struct rtnexthop
) },
2666 [RTA_PREF
] = { .type
= NLA_U8
},
2667 [RTA_ENCAP_TYPE
] = { .type
= NLA_U16
},
2668 [RTA_ENCAP
] = { .type
= NLA_NESTED
},
2671 static int rtm_to_fib6_config(struct sk_buff
*skb
, struct nlmsghdr
*nlh
,
2672 struct fib6_config
*cfg
)
2675 struct nlattr
*tb
[RTA_MAX
+1];
2679 err
= nlmsg_parse(nlh
, sizeof(*rtm
), tb
, RTA_MAX
, rtm_ipv6_policy
);
2684 rtm
= nlmsg_data(nlh
);
2685 memset(cfg
, 0, sizeof(*cfg
));
2687 cfg
->fc_table
= rtm
->rtm_table
;
2688 cfg
->fc_dst_len
= rtm
->rtm_dst_len
;
2689 cfg
->fc_src_len
= rtm
->rtm_src_len
;
2690 cfg
->fc_flags
= RTF_UP
;
2691 cfg
->fc_protocol
= rtm
->rtm_protocol
;
2692 cfg
->fc_type
= rtm
->rtm_type
;
2694 if (rtm
->rtm_type
== RTN_UNREACHABLE
||
2695 rtm
->rtm_type
== RTN_BLACKHOLE
||
2696 rtm
->rtm_type
== RTN_PROHIBIT
||
2697 rtm
->rtm_type
== RTN_THROW
)
2698 cfg
->fc_flags
|= RTF_REJECT
;
2700 if (rtm
->rtm_type
== RTN_LOCAL
)
2701 cfg
->fc_flags
|= RTF_LOCAL
;
2703 if (rtm
->rtm_flags
& RTM_F_CLONED
)
2704 cfg
->fc_flags
|= RTF_CACHE
;
2706 cfg
->fc_nlinfo
.portid
= NETLINK_CB(skb
).portid
;
2707 cfg
->fc_nlinfo
.nlh
= nlh
;
2708 cfg
->fc_nlinfo
.nl_net
= sock_net(skb
->sk
);
2710 if (tb
[RTA_GATEWAY
]) {
2711 cfg
->fc_gateway
= nla_get_in6_addr(tb
[RTA_GATEWAY
]);
2712 cfg
->fc_flags
|= RTF_GATEWAY
;
2716 int plen
= (rtm
->rtm_dst_len
+ 7) >> 3;
2718 if (nla_len(tb
[RTA_DST
]) < plen
)
2721 nla_memcpy(&cfg
->fc_dst
, tb
[RTA_DST
], plen
);
2725 int plen
= (rtm
->rtm_src_len
+ 7) >> 3;
2727 if (nla_len(tb
[RTA_SRC
]) < plen
)
2730 nla_memcpy(&cfg
->fc_src
, tb
[RTA_SRC
], plen
);
2733 if (tb
[RTA_PREFSRC
])
2734 cfg
->fc_prefsrc
= nla_get_in6_addr(tb
[RTA_PREFSRC
]);
2737 cfg
->fc_ifindex
= nla_get_u32(tb
[RTA_OIF
]);
2739 if (tb
[RTA_PRIORITY
])
2740 cfg
->fc_metric
= nla_get_u32(tb
[RTA_PRIORITY
]);
2742 if (tb
[RTA_METRICS
]) {
2743 cfg
->fc_mx
= nla_data(tb
[RTA_METRICS
]);
2744 cfg
->fc_mx_len
= nla_len(tb
[RTA_METRICS
]);
2748 cfg
->fc_table
= nla_get_u32(tb
[RTA_TABLE
]);
2750 if (tb
[RTA_MULTIPATH
]) {
2751 cfg
->fc_mp
= nla_data(tb
[RTA_MULTIPATH
]);
2752 cfg
->fc_mp_len
= nla_len(tb
[RTA_MULTIPATH
]);
2756 pref
= nla_get_u8(tb
[RTA_PREF
]);
2757 if (pref
!= ICMPV6_ROUTER_PREF_LOW
&&
2758 pref
!= ICMPV6_ROUTER_PREF_HIGH
)
2759 pref
= ICMPV6_ROUTER_PREF_MEDIUM
;
2760 cfg
->fc_flags
|= RTF_PREF(pref
);
2764 cfg
->fc_encap
= tb
[RTA_ENCAP
];
2766 if (tb
[RTA_ENCAP_TYPE
])
2767 cfg
->fc_encap_type
= nla_get_u16(tb
[RTA_ENCAP_TYPE
]);
2774 static int ip6_route_multipath(struct fib6_config
*cfg
, int add
)
2776 struct fib6_config r_cfg
;
2777 struct rtnexthop
*rtnh
;
2780 int err
= 0, last_err
= 0;
2782 remaining
= cfg
->fc_mp_len
;
2784 rtnh
= (struct rtnexthop
*)cfg
->fc_mp
;
2786 /* Parse a Multipath Entry */
2787 while (rtnh_ok(rtnh
, remaining
)) {
2788 memcpy(&r_cfg
, cfg
, sizeof(*cfg
));
2789 if (rtnh
->rtnh_ifindex
)
2790 r_cfg
.fc_ifindex
= rtnh
->rtnh_ifindex
;
2792 attrlen
= rtnh_attrlen(rtnh
);
2794 struct nlattr
*nla
, *attrs
= rtnh_attrs(rtnh
);
2796 nla
= nla_find(attrs
, attrlen
, RTA_GATEWAY
);
2798 r_cfg
.fc_gateway
= nla_get_in6_addr(nla
);
2799 r_cfg
.fc_flags
|= RTF_GATEWAY
;
2801 r_cfg
.fc_encap
= nla_find(attrs
, attrlen
, RTA_ENCAP
);
2802 nla
= nla_find(attrs
, attrlen
, RTA_ENCAP_TYPE
);
2804 r_cfg
.fc_encap_type
= nla_get_u16(nla
);
2806 err
= add
? ip6_route_add(&r_cfg
) : ip6_route_del(&r_cfg
);
2809 /* If we are trying to remove a route, do not stop the
2810 * loop when ip6_route_del() fails (because next hop is
2811 * already gone), we should try to remove all next hops.
2814 /* If add fails, we should try to delete all
2815 * next hops that have been already added.
2818 remaining
= cfg
->fc_mp_len
- remaining
;
2822 /* Because each route is added like a single route we remove
2823 * these flags after the first nexthop: if there is a collision,
2824 * we have already failed to add the first nexthop:
2825 * fib6_add_rt2node() has rejected it; when replacing, old
2826 * nexthops have been replaced by first new, the rest should
2829 cfg
->fc_nlinfo
.nlh
->nlmsg_flags
&= ~(NLM_F_EXCL
|
2831 rtnh
= rtnh_next(rtnh
, &remaining
);
2837 static int inet6_rtm_delroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
2839 struct fib6_config cfg
;
2842 err
= rtm_to_fib6_config(skb
, nlh
, &cfg
);
2847 return ip6_route_multipath(&cfg
, 0);
2849 return ip6_route_del(&cfg
);
2852 static int inet6_rtm_newroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
2854 struct fib6_config cfg
;
2857 err
= rtm_to_fib6_config(skb
, nlh
, &cfg
);
2862 return ip6_route_multipath(&cfg
, 1);
2864 return ip6_route_add(&cfg
);
2867 static inline size_t rt6_nlmsg_size(struct rt6_info
*rt
)
2869 return NLMSG_ALIGN(sizeof(struct rtmsg
))
2870 + nla_total_size(16) /* RTA_SRC */
2871 + nla_total_size(16) /* RTA_DST */
2872 + nla_total_size(16) /* RTA_GATEWAY */
2873 + nla_total_size(16) /* RTA_PREFSRC */
2874 + nla_total_size(4) /* RTA_TABLE */
2875 + nla_total_size(4) /* RTA_IIF */
2876 + nla_total_size(4) /* RTA_OIF */
2877 + nla_total_size(4) /* RTA_PRIORITY */
2878 + RTAX_MAX
* nla_total_size(4) /* RTA_METRICS */
2879 + nla_total_size(sizeof(struct rta_cacheinfo
))
2880 + nla_total_size(TCP_CA_NAME_MAX
) /* RTAX_CC_ALGO */
2881 + nla_total_size(1) /* RTA_PREF */
2882 + lwtunnel_get_encap_size(rt
->dst
.lwtstate
);
2885 static int rt6_fill_node(struct net
*net
,
2886 struct sk_buff
*skb
, struct rt6_info
*rt
,
2887 struct in6_addr
*dst
, struct in6_addr
*src
,
2888 int iif
, int type
, u32 portid
, u32 seq
,
2889 int prefix
, int nowait
, unsigned int flags
)
2891 u32 metrics
[RTAX_MAX
];
2893 struct nlmsghdr
*nlh
;
2897 if (prefix
) { /* user wants prefix routes only */
2898 if (!(rt
->rt6i_flags
& RTF_PREFIX_RT
)) {
2899 /* success since this is not a prefix route */
2904 nlh
= nlmsg_put(skb
, portid
, seq
, type
, sizeof(*rtm
), flags
);
2908 rtm
= nlmsg_data(nlh
);
2909 rtm
->rtm_family
= AF_INET6
;
2910 rtm
->rtm_dst_len
= rt
->rt6i_dst
.plen
;
2911 rtm
->rtm_src_len
= rt
->rt6i_src
.plen
;
2914 table
= rt
->rt6i_table
->tb6_id
;
2916 table
= RT6_TABLE_UNSPEC
;
2917 rtm
->rtm_table
= table
;
2918 if (nla_put_u32(skb
, RTA_TABLE
, table
))
2919 goto nla_put_failure
;
2920 if (rt
->rt6i_flags
& RTF_REJECT
) {
2921 switch (rt
->dst
.error
) {
2923 rtm
->rtm_type
= RTN_BLACKHOLE
;
2926 rtm
->rtm_type
= RTN_PROHIBIT
;
2929 rtm
->rtm_type
= RTN_THROW
;
2932 rtm
->rtm_type
= RTN_UNREACHABLE
;
2936 else if (rt
->rt6i_flags
& RTF_LOCAL
)
2937 rtm
->rtm_type
= RTN_LOCAL
;
2938 else if (rt
->dst
.dev
&& (rt
->dst
.dev
->flags
& IFF_LOOPBACK
))
2939 rtm
->rtm_type
= RTN_LOCAL
;
2941 rtm
->rtm_type
= RTN_UNICAST
;
2943 if (!netif_carrier_ok(rt
->dst
.dev
)) {
2944 rtm
->rtm_flags
|= RTNH_F_LINKDOWN
;
2945 if (rt
->rt6i_idev
->cnf
.ignore_routes_with_linkdown
)
2946 rtm
->rtm_flags
|= RTNH_F_DEAD
;
2948 rtm
->rtm_scope
= RT_SCOPE_UNIVERSE
;
2949 rtm
->rtm_protocol
= rt
->rt6i_protocol
;
2950 if (rt
->rt6i_flags
& RTF_DYNAMIC
)
2951 rtm
->rtm_protocol
= RTPROT_REDIRECT
;
2952 else if (rt
->rt6i_flags
& RTF_ADDRCONF
) {
2953 if (rt
->rt6i_flags
& (RTF_DEFAULT
| RTF_ROUTEINFO
))
2954 rtm
->rtm_protocol
= RTPROT_RA
;
2956 rtm
->rtm_protocol
= RTPROT_KERNEL
;
2959 if (rt
->rt6i_flags
& RTF_CACHE
)
2960 rtm
->rtm_flags
|= RTM_F_CLONED
;
2963 if (nla_put_in6_addr(skb
, RTA_DST
, dst
))
2964 goto nla_put_failure
;
2965 rtm
->rtm_dst_len
= 128;
2966 } else if (rtm
->rtm_dst_len
)
2967 if (nla_put_in6_addr(skb
, RTA_DST
, &rt
->rt6i_dst
.addr
))
2968 goto nla_put_failure
;
2969 #ifdef CONFIG_IPV6_SUBTREES
2971 if (nla_put_in6_addr(skb
, RTA_SRC
, src
))
2972 goto nla_put_failure
;
2973 rtm
->rtm_src_len
= 128;
2974 } else if (rtm
->rtm_src_len
&&
2975 nla_put_in6_addr(skb
, RTA_SRC
, &rt
->rt6i_src
.addr
))
2976 goto nla_put_failure
;
2979 #ifdef CONFIG_IPV6_MROUTE
2980 if (ipv6_addr_is_multicast(&rt
->rt6i_dst
.addr
)) {
2981 int err
= ip6mr_get_route(net
, skb
, rtm
, nowait
);
2986 goto nla_put_failure
;
2988 if (err
== -EMSGSIZE
)
2989 goto nla_put_failure
;
2994 if (nla_put_u32(skb
, RTA_IIF
, iif
))
2995 goto nla_put_failure
;
2997 struct in6_addr saddr_buf
;
2998 if (ip6_route_get_saddr(net
, rt
, dst
, 0, &saddr_buf
) == 0 &&
2999 nla_put_in6_addr(skb
, RTA_PREFSRC
, &saddr_buf
))
3000 goto nla_put_failure
;
3003 if (rt
->rt6i_prefsrc
.plen
) {
3004 struct in6_addr saddr_buf
;
3005 saddr_buf
= rt
->rt6i_prefsrc
.addr
;
3006 if (nla_put_in6_addr(skb
, RTA_PREFSRC
, &saddr_buf
))
3007 goto nla_put_failure
;
3010 memcpy(metrics
, dst_metrics_ptr(&rt
->dst
), sizeof(metrics
));
3012 metrics
[RTAX_MTU
- 1] = rt
->rt6i_pmtu
;
3013 if (rtnetlink_put_metrics(skb
, metrics
) < 0)
3014 goto nla_put_failure
;
3016 if (rt
->rt6i_flags
& RTF_GATEWAY
) {
3017 if (nla_put_in6_addr(skb
, RTA_GATEWAY
, &rt
->rt6i_gateway
) < 0)
3018 goto nla_put_failure
;
3022 nla_put_u32(skb
, RTA_OIF
, rt
->dst
.dev
->ifindex
))
3023 goto nla_put_failure
;
3024 if (nla_put_u32(skb
, RTA_PRIORITY
, rt
->rt6i_metric
))
3025 goto nla_put_failure
;
3027 expires
= (rt
->rt6i_flags
& RTF_EXPIRES
) ? rt
->dst
.expires
- jiffies
: 0;
3029 if (rtnl_put_cacheinfo(skb
, &rt
->dst
, 0, expires
, rt
->dst
.error
) < 0)
3030 goto nla_put_failure
;
3032 if (nla_put_u8(skb
, RTA_PREF
, IPV6_EXTRACT_PREF(rt
->rt6i_flags
)))
3033 goto nla_put_failure
;
3035 lwtunnel_fill_encap(skb
, rt
->dst
.lwtstate
);
3037 nlmsg_end(skb
, nlh
);
3041 nlmsg_cancel(skb
, nlh
);
3045 int rt6_dump_route(struct rt6_info
*rt
, void *p_arg
)
3047 struct rt6_rtnl_dump_arg
*arg
= (struct rt6_rtnl_dump_arg
*) p_arg
;
3050 if (nlmsg_len(arg
->cb
->nlh
) >= sizeof(struct rtmsg
)) {
3051 struct rtmsg
*rtm
= nlmsg_data(arg
->cb
->nlh
);
3052 prefix
= (rtm
->rtm_flags
& RTM_F_PREFIX
) != 0;
3056 return rt6_fill_node(arg
->net
,
3057 arg
->skb
, rt
, NULL
, NULL
, 0, RTM_NEWROUTE
,
3058 NETLINK_CB(arg
->cb
->skb
).portid
, arg
->cb
->nlh
->nlmsg_seq
,
3059 prefix
, 0, NLM_F_MULTI
);
3062 static int inet6_rtm_getroute(struct sk_buff
*in_skb
, struct nlmsghdr
*nlh
)
3064 struct net
*net
= sock_net(in_skb
->sk
);
3065 struct nlattr
*tb
[RTA_MAX
+1];
3066 struct rt6_info
*rt
;
3067 struct sk_buff
*skb
;
3070 int err
, iif
= 0, oif
= 0;
3072 err
= nlmsg_parse(nlh
, sizeof(*rtm
), tb
, RTA_MAX
, rtm_ipv6_policy
);
3077 memset(&fl6
, 0, sizeof(fl6
));
3080 if (nla_len(tb
[RTA_SRC
]) < sizeof(struct in6_addr
))
3083 fl6
.saddr
= *(struct in6_addr
*)nla_data(tb
[RTA_SRC
]);
3087 if (nla_len(tb
[RTA_DST
]) < sizeof(struct in6_addr
))
3090 fl6
.daddr
= *(struct in6_addr
*)nla_data(tb
[RTA_DST
]);
3094 iif
= nla_get_u32(tb
[RTA_IIF
]);
3097 oif
= nla_get_u32(tb
[RTA_OIF
]);
3100 fl6
.flowi6_mark
= nla_get_u32(tb
[RTA_MARK
]);
3103 struct net_device
*dev
;
3106 dev
= __dev_get_by_index(net
, iif
);
3112 fl6
.flowi6_iif
= iif
;
3114 if (!ipv6_addr_any(&fl6
.saddr
))
3115 flags
|= RT6_LOOKUP_F_HAS_SADDR
;
3117 rt
= (struct rt6_info
*)ip6_route_input_lookup(net
, dev
, &fl6
,
3120 fl6
.flowi6_oif
= oif
;
3122 rt
= (struct rt6_info
*)ip6_route_output(net
, NULL
, &fl6
);
3125 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
3132 /* Reserve room for dummy headers, this skb can pass
3133 through good chunk of routing engine.
3135 skb_reset_mac_header(skb
);
3136 skb_reserve(skb
, MAX_HEADER
+ sizeof(struct ipv6hdr
));
3138 skb_dst_set(skb
, &rt
->dst
);
3140 err
= rt6_fill_node(net
, skb
, rt
, &fl6
.daddr
, &fl6
.saddr
, iif
,
3141 RTM_NEWROUTE
, NETLINK_CB(in_skb
).portid
,
3142 nlh
->nlmsg_seq
, 0, 0, 0);
3148 err
= rtnl_unicast(skb
, net
, NETLINK_CB(in_skb
).portid
);
3153 void inet6_rt_notify(int event
, struct rt6_info
*rt
, struct nl_info
*info
)
3155 struct sk_buff
*skb
;
3156 struct net
*net
= info
->nl_net
;
3161 seq
= info
->nlh
? info
->nlh
->nlmsg_seq
: 0;
3163 skb
= nlmsg_new(rt6_nlmsg_size(rt
), gfp_any());
3167 err
= rt6_fill_node(net
, skb
, rt
, NULL
, NULL
, 0,
3168 event
, info
->portid
, seq
, 0, 0, 0);
3170 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3171 WARN_ON(err
== -EMSGSIZE
);
3175 rtnl_notify(skb
, net
, info
->portid
, RTNLGRP_IPV6_ROUTE
,
3176 info
->nlh
, gfp_any());
3180 rtnl_set_sk_err(net
, RTNLGRP_IPV6_ROUTE
, err
);
3183 static int ip6_route_dev_notify(struct notifier_block
*this,
3184 unsigned long event
, void *ptr
)
3186 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
3187 struct net
*net
= dev_net(dev
);
3189 if (event
== NETDEV_REGISTER
&& (dev
->flags
& IFF_LOOPBACK
)) {
3190 net
->ipv6
.ip6_null_entry
->dst
.dev
= dev
;
3191 net
->ipv6
.ip6_null_entry
->rt6i_idev
= in6_dev_get(dev
);
3192 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3193 net
->ipv6
.ip6_prohibit_entry
->dst
.dev
= dev
;
3194 net
->ipv6
.ip6_prohibit_entry
->rt6i_idev
= in6_dev_get(dev
);
3195 net
->ipv6
.ip6_blk_hole_entry
->dst
.dev
= dev
;
3196 net
->ipv6
.ip6_blk_hole_entry
->rt6i_idev
= in6_dev_get(dev
);
3207 #ifdef CONFIG_PROC_FS
3209 static const struct file_operations ipv6_route_proc_fops
= {
3210 .owner
= THIS_MODULE
,
3211 .open
= ipv6_route_open
,
3213 .llseek
= seq_lseek
,
3214 .release
= seq_release_net
,
3217 static int rt6_stats_seq_show(struct seq_file
*seq
, void *v
)
3219 struct net
*net
= (struct net
*)seq
->private;
3220 seq_printf(seq
, "%04x %04x %04x %04x %04x %04x %04x\n",
3221 net
->ipv6
.rt6_stats
->fib_nodes
,
3222 net
->ipv6
.rt6_stats
->fib_route_nodes
,
3223 net
->ipv6
.rt6_stats
->fib_rt_alloc
,
3224 net
->ipv6
.rt6_stats
->fib_rt_entries
,
3225 net
->ipv6
.rt6_stats
->fib_rt_cache
,
3226 dst_entries_get_slow(&net
->ipv6
.ip6_dst_ops
),
3227 net
->ipv6
.rt6_stats
->fib_discarded_routes
);
3232 static int rt6_stats_seq_open(struct inode
*inode
, struct file
*file
)
3234 return single_open_net(inode
, file
, rt6_stats_seq_show
);
3237 static const struct file_operations rt6_stats_seq_fops
= {
3238 .owner
= THIS_MODULE
,
3239 .open
= rt6_stats_seq_open
,
3241 .llseek
= seq_lseek
,
3242 .release
= single_release_net
,
3244 #endif /* CONFIG_PROC_FS */
3246 #ifdef CONFIG_SYSCTL
3249 int ipv6_sysctl_rtcache_flush(struct ctl_table
*ctl
, int write
,
3250 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
3257 net
= (struct net
*)ctl
->extra1
;
3258 delay
= net
->ipv6
.sysctl
.flush_delay
;
3259 proc_dointvec(ctl
, write
, buffer
, lenp
, ppos
);
3260 fib6_run_gc(delay
<= 0 ? 0 : (unsigned long)delay
, net
, delay
> 0);
3264 struct ctl_table ipv6_route_table_template
[] = {
3266 .procname
= "flush",
3267 .data
= &init_net
.ipv6
.sysctl
.flush_delay
,
3268 .maxlen
= sizeof(int),
3270 .proc_handler
= ipv6_sysctl_rtcache_flush
3273 .procname
= "gc_thresh",
3274 .data
= &ip6_dst_ops_template
.gc_thresh
,
3275 .maxlen
= sizeof(int),
3277 .proc_handler
= proc_dointvec
,
3280 .procname
= "max_size",
3281 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_max_size
,
3282 .maxlen
= sizeof(int),
3284 .proc_handler
= proc_dointvec
,
3287 .procname
= "gc_min_interval",
3288 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_min_interval
,
3289 .maxlen
= sizeof(int),
3291 .proc_handler
= proc_dointvec_jiffies
,
3294 .procname
= "gc_timeout",
3295 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_timeout
,
3296 .maxlen
= sizeof(int),
3298 .proc_handler
= proc_dointvec_jiffies
,
3301 .procname
= "gc_interval",
3302 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_interval
,
3303 .maxlen
= sizeof(int),
3305 .proc_handler
= proc_dointvec_jiffies
,
3308 .procname
= "gc_elasticity",
3309 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_elasticity
,
3310 .maxlen
= sizeof(int),
3312 .proc_handler
= proc_dointvec
,
3315 .procname
= "mtu_expires",
3316 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_mtu_expires
,
3317 .maxlen
= sizeof(int),
3319 .proc_handler
= proc_dointvec_jiffies
,
3322 .procname
= "min_adv_mss",
3323 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_min_advmss
,
3324 .maxlen
= sizeof(int),
3326 .proc_handler
= proc_dointvec
,
3329 .procname
= "gc_min_interval_ms",
3330 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_min_interval
,
3331 .maxlen
= sizeof(int),
3333 .proc_handler
= proc_dointvec_ms_jiffies
,
3338 struct ctl_table
* __net_init
ipv6_route_sysctl_init(struct net
*net
)
3340 struct ctl_table
*table
;
3342 table
= kmemdup(ipv6_route_table_template
,
3343 sizeof(ipv6_route_table_template
),
3347 table
[0].data
= &net
->ipv6
.sysctl
.flush_delay
;
3348 table
[0].extra1
= net
;
3349 table
[1].data
= &net
->ipv6
.ip6_dst_ops
.gc_thresh
;
3350 table
[2].data
= &net
->ipv6
.sysctl
.ip6_rt_max_size
;
3351 table
[3].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
;
3352 table
[4].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_timeout
;
3353 table
[5].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_interval
;
3354 table
[6].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_elasticity
;
3355 table
[7].data
= &net
->ipv6
.sysctl
.ip6_rt_mtu_expires
;
3356 table
[8].data
= &net
->ipv6
.sysctl
.ip6_rt_min_advmss
;
3357 table
[9].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
;
3359 /* Don't export sysctls to unprivileged users */
3360 if (net
->user_ns
!= &init_user_ns
)
3361 table
[0].procname
= NULL
;
3368 static int __net_init
ip6_route_net_init(struct net
*net
)
3372 memcpy(&net
->ipv6
.ip6_dst_ops
, &ip6_dst_ops_template
,
3373 sizeof(net
->ipv6
.ip6_dst_ops
));
3375 if (dst_entries_init(&net
->ipv6
.ip6_dst_ops
) < 0)
3376 goto out_ip6_dst_ops
;
3378 net
->ipv6
.ip6_null_entry
= kmemdup(&ip6_null_entry_template
,
3379 sizeof(*net
->ipv6
.ip6_null_entry
),
3381 if (!net
->ipv6
.ip6_null_entry
)
3382 goto out_ip6_dst_entries
;
3383 net
->ipv6
.ip6_null_entry
->dst
.path
=
3384 (struct dst_entry
*)net
->ipv6
.ip6_null_entry
;
3385 net
->ipv6
.ip6_null_entry
->dst
.ops
= &net
->ipv6
.ip6_dst_ops
;
3386 dst_init_metrics(&net
->ipv6
.ip6_null_entry
->dst
,
3387 ip6_template_metrics
, true);
3389 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3390 net
->ipv6
.ip6_prohibit_entry
= kmemdup(&ip6_prohibit_entry_template
,
3391 sizeof(*net
->ipv6
.ip6_prohibit_entry
),
3393 if (!net
->ipv6
.ip6_prohibit_entry
)
3394 goto out_ip6_null_entry
;
3395 net
->ipv6
.ip6_prohibit_entry
->dst
.path
=
3396 (struct dst_entry
*)net
->ipv6
.ip6_prohibit_entry
;
3397 net
->ipv6
.ip6_prohibit_entry
->dst
.ops
= &net
->ipv6
.ip6_dst_ops
;
3398 dst_init_metrics(&net
->ipv6
.ip6_prohibit_entry
->dst
,
3399 ip6_template_metrics
, true);
3401 net
->ipv6
.ip6_blk_hole_entry
= kmemdup(&ip6_blk_hole_entry_template
,
3402 sizeof(*net
->ipv6
.ip6_blk_hole_entry
),
3404 if (!net
->ipv6
.ip6_blk_hole_entry
)
3405 goto out_ip6_prohibit_entry
;
3406 net
->ipv6
.ip6_blk_hole_entry
->dst
.path
=
3407 (struct dst_entry
*)net
->ipv6
.ip6_blk_hole_entry
;
3408 net
->ipv6
.ip6_blk_hole_entry
->dst
.ops
= &net
->ipv6
.ip6_dst_ops
;
3409 dst_init_metrics(&net
->ipv6
.ip6_blk_hole_entry
->dst
,
3410 ip6_template_metrics
, true);
3413 net
->ipv6
.sysctl
.flush_delay
= 0;
3414 net
->ipv6
.sysctl
.ip6_rt_max_size
= 4096;
3415 net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
= HZ
/ 2;
3416 net
->ipv6
.sysctl
.ip6_rt_gc_timeout
= 60*HZ
;
3417 net
->ipv6
.sysctl
.ip6_rt_gc_interval
= 30*HZ
;
3418 net
->ipv6
.sysctl
.ip6_rt_gc_elasticity
= 9;
3419 net
->ipv6
.sysctl
.ip6_rt_mtu_expires
= 10*60*HZ
;
3420 net
->ipv6
.sysctl
.ip6_rt_min_advmss
= IPV6_MIN_MTU
- 20 - 40;
3422 net
->ipv6
.ip6_rt_gc_expire
= 30*HZ
;
3428 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3429 out_ip6_prohibit_entry
:
3430 kfree(net
->ipv6
.ip6_prohibit_entry
);
3432 kfree(net
->ipv6
.ip6_null_entry
);
3434 out_ip6_dst_entries
:
3435 dst_entries_destroy(&net
->ipv6
.ip6_dst_ops
);
3440 static void __net_exit
ip6_route_net_exit(struct net
*net
)
3442 kfree(net
->ipv6
.ip6_null_entry
);
3443 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3444 kfree(net
->ipv6
.ip6_prohibit_entry
);
3445 kfree(net
->ipv6
.ip6_blk_hole_entry
);
3447 dst_entries_destroy(&net
->ipv6
.ip6_dst_ops
);
3450 static int __net_init
ip6_route_net_init_late(struct net
*net
)
3452 #ifdef CONFIG_PROC_FS
3453 proc_create("ipv6_route", 0, net
->proc_net
, &ipv6_route_proc_fops
);
3454 proc_create("rt6_stats", S_IRUGO
, net
->proc_net
, &rt6_stats_seq_fops
);
3459 static void __net_exit
ip6_route_net_exit_late(struct net
*net
)
3461 #ifdef CONFIG_PROC_FS
3462 remove_proc_entry("ipv6_route", net
->proc_net
);
3463 remove_proc_entry("rt6_stats", net
->proc_net
);
3467 static struct pernet_operations ip6_route_net_ops
= {
3468 .init
= ip6_route_net_init
,
3469 .exit
= ip6_route_net_exit
,
3472 static int __net_init
ipv6_inetpeer_init(struct net
*net
)
3474 struct inet_peer_base
*bp
= kmalloc(sizeof(*bp
), GFP_KERNEL
);
3478 inet_peer_base_init(bp
);
3479 net
->ipv6
.peers
= bp
;
3483 static void __net_exit
ipv6_inetpeer_exit(struct net
*net
)
3485 struct inet_peer_base
*bp
= net
->ipv6
.peers
;
3487 net
->ipv6
.peers
= NULL
;
3488 inetpeer_invalidate_tree(bp
);
3492 static struct pernet_operations ipv6_inetpeer_ops
= {
3493 .init
= ipv6_inetpeer_init
,
3494 .exit
= ipv6_inetpeer_exit
,
3497 static struct pernet_operations ip6_route_net_late_ops
= {
3498 .init
= ip6_route_net_init_late
,
3499 .exit
= ip6_route_net_exit_late
,
3502 static struct notifier_block ip6_route_dev_notifier
= {
3503 .notifier_call
= ip6_route_dev_notify
,
3507 int __init
ip6_route_init(void)
3513 ip6_dst_ops_template
.kmem_cachep
=
3514 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info
), 0,
3515 SLAB_HWCACHE_ALIGN
, NULL
);
3516 if (!ip6_dst_ops_template
.kmem_cachep
)
3519 ret
= dst_entries_init(&ip6_dst_blackhole_ops
);
3521 goto out_kmem_cache
;
3523 ret
= register_pernet_subsys(&ipv6_inetpeer_ops
);
3525 goto out_dst_entries
;
3527 ret
= register_pernet_subsys(&ip6_route_net_ops
);
3529 goto out_register_inetpeer
;
3531 ip6_dst_blackhole_ops
.kmem_cachep
= ip6_dst_ops_template
.kmem_cachep
;
3533 /* Registering of the loopback is done before this portion of code,
3534 * the loopback reference in rt6_info will not be taken, do it
3535 * manually for init_net */
3536 init_net
.ipv6
.ip6_null_entry
->dst
.dev
= init_net
.loopback_dev
;
3537 init_net
.ipv6
.ip6_null_entry
->rt6i_idev
= in6_dev_get(init_net
.loopback_dev
);
3538 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3539 init_net
.ipv6
.ip6_prohibit_entry
->dst
.dev
= init_net
.loopback_dev
;
3540 init_net
.ipv6
.ip6_prohibit_entry
->rt6i_idev
= in6_dev_get(init_net
.loopback_dev
);
3541 init_net
.ipv6
.ip6_blk_hole_entry
->dst
.dev
= init_net
.loopback_dev
;
3542 init_net
.ipv6
.ip6_blk_hole_entry
->rt6i_idev
= in6_dev_get(init_net
.loopback_dev
);
3546 goto out_register_subsys
;
3552 ret
= fib6_rules_init();
3556 ret
= register_pernet_subsys(&ip6_route_net_late_ops
);
3558 goto fib6_rules_init
;
3561 if (__rtnl_register(PF_INET6
, RTM_NEWROUTE
, inet6_rtm_newroute
, NULL
, NULL
) ||
3562 __rtnl_register(PF_INET6
, RTM_DELROUTE
, inet6_rtm_delroute
, NULL
, NULL
) ||
3563 __rtnl_register(PF_INET6
, RTM_GETROUTE
, inet6_rtm_getroute
, NULL
, NULL
))
3564 goto out_register_late_subsys
;
3566 ret
= register_netdevice_notifier(&ip6_route_dev_notifier
);
3568 goto out_register_late_subsys
;
3570 for_each_possible_cpu(cpu
) {
3571 struct uncached_list
*ul
= per_cpu_ptr(&rt6_uncached_list
, cpu
);
3573 INIT_LIST_HEAD(&ul
->head
);
3574 spin_lock_init(&ul
->lock
);
3580 out_register_late_subsys
:
3581 unregister_pernet_subsys(&ip6_route_net_late_ops
);
3583 fib6_rules_cleanup();
3588 out_register_subsys
:
3589 unregister_pernet_subsys(&ip6_route_net_ops
);
3590 out_register_inetpeer
:
3591 unregister_pernet_subsys(&ipv6_inetpeer_ops
);
3593 dst_entries_destroy(&ip6_dst_blackhole_ops
);
3595 kmem_cache_destroy(ip6_dst_ops_template
.kmem_cachep
);
3599 void ip6_route_cleanup(void)
3601 unregister_netdevice_notifier(&ip6_route_dev_notifier
);
3602 unregister_pernet_subsys(&ip6_route_net_late_ops
);
3603 fib6_rules_cleanup();
3606 unregister_pernet_subsys(&ipv6_inetpeer_ops
);
3607 unregister_pernet_subsys(&ip6_route_net_ops
);
3608 dst_entries_destroy(&ip6_dst_blackhole_ops
);
3609 kmem_cache_destroy(ip6_dst_ops_template
.kmem_cachep
);