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Merge branch 'isdn-null-deref'
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / route.c
CommitLineData
1da177e4
LT		 1/*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 7 *
1da177e4
LT		 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.
12 */
13
14/* Changes:
15 *
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.
c0bece9f
YH		 23 * Ville Nuorvala
24 * Fixed routing subtrees.
1da177e4
LT		 25 */
26
f3213831
JP		 27#define pr_fmt(fmt) "IPv6: " fmt
28
4fc268d2 29#include <linux/capability.h>
1da177e4 30#include <linux/errno.h>
bc3b2d7f 31#include <linux/export.h>
1da177e4
LT		 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>
7bc570c8 40#include <linux/mroute6.h>
1da177e4 41#include <linux/init.h>
1da177e4 42#include <linux/if_arp.h>
1da177e4
LT		 43#include <linux/proc_fs.h>
44#include <linux/seq_file.h>
5b7c931d 45#include <linux/nsproxy.h>
5a0e3ad6 46#include <linux/slab.h>
457c4cbc 47#include <net/net_namespace.h>
1da177e4
LT		 48#include <net/snmp.h>
49#include <net/ipv6.h>
50#include <net/ip6_fib.h>
51#include <net/ip6_route.h>
52#include <net/ndisc.h>
53#include <net/addrconf.h>
54#include <net/tcp.h>
55#include <linux/rtnetlink.h>
56#include <net/dst.h>
904af04d 57#include <net/dst_metadata.h>
1da177e4 58#include <net/xfrm.h>
8d71740c 59#include <net/netevent.h>
21713ebc 60#include <net/netlink.h>
51ebd318 61#include <net/nexthop.h>
19e42e45 62#include <net/lwtunnel.h>
904af04d 63#include <net/ip_tunnels.h>
1da177e4
LT		 64
65#include <asm/uaccess.h>
66
67#ifdef CONFIG_SYSCTL
68#include <linux/sysctl.h>
69#endif
70
afc154e9 71enum rt6_nud_state {
7e980569
JB		 72 RT6_NUD_FAIL_HARD = -3,
73 RT6_NUD_FAIL_PROBE = -2,
74 RT6_NUD_FAIL_DO_RR = -1,
afc154e9
HFS		 75 RT6_NUD_SUCCEED = 1
76};
77
83a09abd 78static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
1da177e4 79static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
0dbaee3b 80static unsigned int ip6_default_advmss(const struct dst_entry *dst);
ebb762f2 81static unsigned int ip6_mtu(const struct dst_entry *dst);
1da177e4
LT		 82static struct dst_entry *ip6_negative_advice(struct dst_entry *);
83static void ip6_dst_destroy(struct dst_entry *);
84static void ip6_dst_ifdown(struct dst_entry *,
85 struct net_device *dev, int how);
569d3645 86static int ip6_dst_gc(struct dst_ops *ops);
1da177e4
LT		 87
88static int ip6_pkt_discard(struct sk_buff *skb);
aad88724 89static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
7150aede 90static int ip6_pkt_prohibit(struct sk_buff *skb);
aad88724 91static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb);
1da177e4 92static void ip6_link_failure(struct sk_buff *skb);
6700c270
DM		 93static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
94 struct sk_buff *skb, u32 mtu);
95static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
96 struct sk_buff *skb);
4b32b5ad 97static void rt6_dst_from_metrics_check(struct rt6_info *rt);
52bd4c0c 98static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
1da177e4 99
70ceb4f5 100#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 101static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 102 const struct in6_addr *prefix, int prefixlen,
103 const struct in6_addr *gwaddr, int ifindex,
95c96174 104 unsigned int pref);
efa2cea0 105static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 106 const struct in6_addr *prefix, int prefixlen,
107 const struct in6_addr *gwaddr, int ifindex);
70ceb4f5
YH		 108#endif
109
8d0b94af
MKL		 110struct uncached_list {
111 spinlock_t lock;
112 struct list_head head;
113};
114
115static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
116
117static void rt6_uncached_list_add(struct rt6_info *rt)
118{
119 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
120
121 rt->dst.flags |= DST_NOCACHE;
122 rt->rt6i_uncached_list = ul;
123
124 spin_lock_bh(&ul->lock);
125 list_add_tail(&rt->rt6i_uncached, &ul->head);
126 spin_unlock_bh(&ul->lock);
127}
128
129static void rt6_uncached_list_del(struct rt6_info *rt)
130{
131 if (!list_empty(&rt->rt6i_uncached)) {
132 struct uncached_list *ul = rt->rt6i_uncached_list;
133
134 spin_lock_bh(&ul->lock);
135 list_del(&rt->rt6i_uncached);
136 spin_unlock_bh(&ul->lock);
137 }
138}
139
140static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
141{
142 struct net_device *loopback_dev = net->loopback_dev;
143 int cpu;
144
e332bc67
EB		 145 if (dev == loopback_dev)
146 return;
147
8d0b94af
MKL		 148 for_each_possible_cpu(cpu) {
149 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
150 struct rt6_info *rt;
151
152 spin_lock_bh(&ul->lock);
153 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
154 struct inet6_dev *rt_idev = rt->rt6i_idev;
155 struct net_device *rt_dev = rt->dst.dev;
156
e332bc67 157 if (rt_idev->dev == dev) {
8d0b94af
MKL		 158 rt->rt6i_idev = in6_dev_get(loopback_dev);
159 in6_dev_put(rt_idev);
160 }
161
e332bc67 162 if (rt_dev == dev) {
8d0b94af
MKL		 163 rt->dst.dev = loopback_dev;
164 dev_hold(rt->dst.dev);
165 dev_put(rt_dev);
166 }
167 }
168 spin_unlock_bh(&ul->lock);
169 }
170}
171
d52d3997
MKL		 172static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
173{
174 return dst_metrics_write_ptr(rt->dst.from);
175}
176
06582540
DM		 177static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
178{
4b32b5ad 179 struct rt6_info *rt = (struct rt6_info *)dst;
06582540 180
d52d3997
MKL		 181 if (rt->rt6i_flags & RTF_PCPU)
182 return rt6_pcpu_cow_metrics(rt);
183 else if (rt->rt6i_flags & RTF_CACHE)
4b32b5ad
MKL		 184 return NULL;
185 else
3b471175 186 return dst_cow_metrics_generic(dst, old);
06582540
DM		 187}
188
f894cbf8
DM		 189static inline const void *choose_neigh_daddr(struct rt6_info *rt,
190 struct sk_buff *skb,
191 const void *daddr)
39232973
DM		 192{
193 struct in6_addr *p = &rt->rt6i_gateway;
194
a7563f34 195 if (!ipv6_addr_any(p))
39232973 196 return (const void *) p;
f894cbf8
DM		 197 else if (skb)
198 return &ipv6_hdr(skb)->daddr;
39232973
DM		 199 return daddr;
200}
201
f894cbf8
DM		 202static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
203 struct sk_buff *skb,
204 const void *daddr)
d3aaeb38 205{
39232973
DM		 206 struct rt6_info *rt = (struct rt6_info *) dst;
207 struct neighbour *n;
208
f894cbf8 209 daddr = choose_neigh_daddr(rt, skb, daddr);
8e022ee6 210 n = __ipv6_neigh_lookup(dst->dev, daddr);
f83c7790
DM		 211 if (n)
212 return n;
213 return neigh_create(&nd_tbl, daddr, dst->dev);
214}
215
9a7ec3a9 216static struct dst_ops ip6_dst_ops_template = {
1da177e4 217 .family = AF_INET6,
1da177e4
LT		 218 .gc = ip6_dst_gc,
219 .gc_thresh = 1024,
220 .check = ip6_dst_check,
0dbaee3b 221 .default_advmss = ip6_default_advmss,
ebb762f2 222 .mtu = ip6_mtu,
06582540 223 .cow_metrics = ipv6_cow_metrics,
1da177e4
LT		 224 .destroy = ip6_dst_destroy,
225 .ifdown = ip6_dst_ifdown,
226 .negative_advice = ip6_negative_advice,
227 .link_failure = ip6_link_failure,
228 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 229 .redirect = rt6_do_redirect,
1ac06e03 230 .local_out = __ip6_local_out,
d3aaeb38 231 .neigh_lookup = ip6_neigh_lookup,
1da177e4
LT		 232};
233
ebb762f2 234static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
ec831ea7 235{
618f9bc7
SK		 236 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
237
238 return mtu ? : dst->dev->mtu;
ec831ea7
RD		 239}
240
6700c270
DM		 241static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
242 struct sk_buff *skb, u32 mtu)
14e50e57
DM		 243{
244}
245
6700c270
DM		 246static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
247 struct sk_buff *skb)
b587ee3b
DM		 248{
249}
250
14e50e57
DM		 251static struct dst_ops ip6_dst_blackhole_ops = {
252 .family = AF_INET6,
14e50e57
DM		 253 .destroy = ip6_dst_destroy,
254 .check = ip6_dst_check,
ebb762f2 255 .mtu = ip6_blackhole_mtu,
214f45c9 256 .default_advmss = ip6_default_advmss,
14e50e57 257 .update_pmtu = ip6_rt_blackhole_update_pmtu,
b587ee3b 258 .redirect = ip6_rt_blackhole_redirect,
0a1f5962 259 .cow_metrics = dst_cow_metrics_generic,
d3aaeb38 260 .neigh_lookup = ip6_neigh_lookup,
14e50e57
DM		 261};
262
62fa8a84 263static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 264 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 265};
266
fb0af4c7 267static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 268 .dst = {
269 .__refcnt = ATOMIC_INIT(1),
270 .__use = 1,
2c20cbd7 271 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 272 .error = -ENETUNREACH,
d8d1f30b
CG		 273 .input = ip6_pkt_discard,
274 .output = ip6_pkt_discard_out,
1da177e4
LT		 275 },
276 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 277 .rt6i_protocol = RTPROT_KERNEL,
1da177e4
LT		 278 .rt6i_metric = ~(u32) 0,
279 .rt6i_ref = ATOMIC_INIT(1),
280};
281
101367c2
TG		 282#ifdef CONFIG_IPV6_MULTIPLE_TABLES
283
fb0af4c7 284static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 285 .dst = {
286 .__refcnt = ATOMIC_INIT(1),
287 .__use = 1,
2c20cbd7 288 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 289 .error = -EACCES,
d8d1f30b
CG		 290 .input = ip6_pkt_prohibit,
291 .output = ip6_pkt_prohibit_out,
101367c2
TG		 292 },
293 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 294 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 295 .rt6i_metric = ~(u32) 0,
296 .rt6i_ref = ATOMIC_INIT(1),
297};
298
fb0af4c7 299static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 300 .dst = {
301 .__refcnt = ATOMIC_INIT(1),
302 .__use = 1,
2c20cbd7 303 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 304 .error = -EINVAL,
d8d1f30b 305 .input = dst_discard,
aad88724 306 .output = dst_discard_sk,
101367c2
TG		 307 },
308 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 309 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 310 .rt6i_metric = ~(u32) 0,
311 .rt6i_ref = ATOMIC_INIT(1),
312};
313
314#endif
315
ebfa45f0
MKL		 316static void rt6_info_init(struct rt6_info *rt)
317{
318 struct dst_entry *dst = &rt->dst;
319
320 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
321 INIT_LIST_HEAD(&rt->rt6i_siblings);
322 INIT_LIST_HEAD(&rt->rt6i_uncached);
323}
324
1da177e4 325/* allocate dst with ip6_dst_ops */
d52d3997
MKL		 326static struct rt6_info *__ip6_dst_alloc(struct net *net,
327 struct net_device *dev,
ad706862 328 int flags)
1da177e4 329{
97bab73f 330 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
6f3118b5 331 0, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 332
ebfa45f0
MKL		 333 if (rt)
334 rt6_info_init(rt);
8104891b 335
cf911662 336 return rt;
1da177e4
LT		 337}
338
d52d3997
MKL		 339static struct rt6_info *ip6_dst_alloc(struct net *net,
340 struct net_device *dev,
ad706862 341 int flags)
d52d3997 342{
ad706862 343 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
d52d3997
MKL		 344
345 if (rt) {
346 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
347 if (rt->rt6i_pcpu) {
348 int cpu;
349
350 for_each_possible_cpu(cpu) {
351 struct rt6_info **p;
352
353 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
354 /* no one shares rt */
355 *p = NULL;
356 }
357 } else {
358 dst_destroy((struct dst_entry *)rt);
359 return NULL;
360 }
361 }
362
363 return rt;
364}
365
1da177e4
LT		 366static void ip6_dst_destroy(struct dst_entry *dst)
367{
368 struct rt6_info *rt = (struct rt6_info *)dst;
ecd98837 369 struct dst_entry *from = dst->from;
8d0b94af 370 struct inet6_dev *idev;
1da177e4 371
4b32b5ad 372 dst_destroy_metrics_generic(dst);
87775312 373 free_percpu(rt->rt6i_pcpu);
8d0b94af
MKL		 374 rt6_uncached_list_del(rt);
375
376 idev = rt->rt6i_idev;
38308473 377 if (idev) {
1da177e4
LT		 378 rt->rt6i_idev = NULL;
379 in6_dev_put(idev);
1ab1457c 380 }
1716a961 381
ecd98837
YH		 382 dst->from = NULL;
383 dst_release(from);
b3419363
DM		 384}
385
1da177e4
LT		 386static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
387 int how)
388{
389 struct rt6_info *rt = (struct rt6_info *)dst;
390 struct inet6_dev *idev = rt->rt6i_idev;
5a3e55d6 391 struct net_device *loopback_dev =
c346dca1 392 dev_net(dev)->loopback_dev;
1da177e4 393
97cac082
DM		 394 if (dev != loopback_dev) {
395 if (idev && idev->dev == dev) {
396 struct inet6_dev *loopback_idev =
397 in6_dev_get(loopback_dev);
398 if (loopback_idev) {
399 rt->rt6i_idev = loopback_idev;
400 in6_dev_put(idev);
401 }
402 }
1da177e4
LT		 403 }
404}
405
a50feda5 406static bool rt6_check_expired(const struct rt6_info *rt)
1da177e4 407{
1716a961
G		 408 if (rt->rt6i_flags & RTF_EXPIRES) {
409 if (time_after(jiffies, rt->dst.expires))
a50feda5 410 return true;
1716a961 411 } else if (rt->dst.from) {
3fd91fb3 412 return rt6_check_expired((struct rt6_info *) rt->dst.from);
1716a961 413 }
a50feda5 414 return false;
1da177e4
LT		 415}
416
51ebd318
ND		 417/* Multipath route selection:
418 * Hash based function using packet header and flowlabel.
419 * Adapted from fib_info_hashfn()
420 */
421static int rt6_info_hash_nhsfn(unsigned int candidate_count,
422 const struct flowi6 *fl6)
423{
424 unsigned int val = fl6->flowi6_proto;
425
c08977bb
YH		 426 val ^= ipv6_addr_hash(&fl6->daddr);
427 val ^= ipv6_addr_hash(&fl6->saddr);
51ebd318
ND		 428
429 /* Work only if this not encapsulated */
430 switch (fl6->flowi6_proto) {
431 case IPPROTO_UDP:
432 case IPPROTO_TCP:
433 case IPPROTO_SCTP:
b3ce5ae1
ND		 434 val ^= (__force u16)fl6->fl6_sport;
435 val ^= (__force u16)fl6->fl6_dport;
51ebd318
ND		 436 break;
437
438 case IPPROTO_ICMPV6:
b3ce5ae1
ND		 439 val ^= (__force u16)fl6->fl6_icmp_type;
440 val ^= (__force u16)fl6->fl6_icmp_code;
51ebd318
ND		 441 break;
442 }
443 /* RFC6438 recommands to use flowlabel */
b3ce5ae1 444 val ^= (__force u32)fl6->flowlabel;
51ebd318
ND		 445
446 /* Perhaps, we need to tune, this function? */
447 val = val ^ (val >> 7) ^ (val >> 12);
448 return val % candidate_count;
449}
450
451static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
52bd4c0c
ND		 452 struct flowi6 *fl6, int oif,
453 int strict)
51ebd318
ND		 454{
455 struct rt6_info *sibling, *next_sibling;
456 int route_choosen;
457
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)
461 */
462 if (route_choosen)
463 list_for_each_entry_safe(sibling, next_sibling,
464 &match->rt6i_siblings, rt6i_siblings) {
465 route_choosen--;
466 if (route_choosen == 0) {
52bd4c0c
ND		 467 if (rt6_score_route(sibling, oif, strict) < 0)
468 break;
51ebd318
ND		 469 match = sibling;
470 break;
471 }
472 }
473 return match;
474}
475
1da177e4 476/*
c71099ac 477 * Route lookup. Any table->tb6_lock is implied.
1da177e4
LT		 478 */
479
8ed67789
DL		 480static inline struct rt6_info *rt6_device_match(struct net *net,
481 struct rt6_info *rt,
b71d1d42 482 const struct in6_addr *saddr,
1da177e4 483 int oif,
d420895e 484 int flags)
1da177e4
LT		 485{
486 struct rt6_info *local = NULL;
487 struct rt6_info *sprt;
488
dd3abc4e
YH		 489 if (!oif && ipv6_addr_any(saddr))
490 goto out;
491
d8d1f30b 492 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
d1918542 493 struct net_device *dev = sprt->dst.dev;
dd3abc4e
YH		 494
495 if (oif) {
1da177e4
LT		 496 if (dev->ifindex == oif)
497 return sprt;
498 if (dev->flags & IFF_LOOPBACK) {
38308473 499 if (!sprt->rt6i_idev ||
1da177e4 500 sprt->rt6i_idev->dev->ifindex != oif) {
d420895e 501 if (flags & RT6_LOOKUP_F_IFACE && oif)
1da177e4 502 continue;
1ab1457c 503 if (local && (!oif ||
1da177e4
LT		 504 local->rt6i_idev->dev->ifindex == oif))
505 continue;
506 }
507 local = sprt;
508 }
dd3abc4e
YH		 509 } else {
510 if (ipv6_chk_addr(net, saddr, dev,
511 flags & RT6_LOOKUP_F_IFACE))
512 return sprt;
1da177e4 513 }
dd3abc4e 514 }
1da177e4 515
dd3abc4e 516 if (oif) {
1da177e4
LT		 517 if (local)
518 return local;
519
d420895e 520 if (flags & RT6_LOOKUP_F_IFACE)
8ed67789 521 return net->ipv6.ip6_null_entry;
1da177e4 522 }
dd3abc4e 523out:
1da177e4
LT		 524 return rt;
525}
526
27097255 527#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 528struct __rt6_probe_work {
529 struct work_struct work;
530 struct in6_addr target;
531 struct net_device *dev;
532};
533
534static void rt6_probe_deferred(struct work_struct *w)
535{
536 struct in6_addr mcaddr;
537 struct __rt6_probe_work *work =
538 container_of(w, struct __rt6_probe_work, work);
539
540 addrconf_addr_solict_mult(&work->target, &mcaddr);
ab450605 541 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL, NULL);
c2f17e82 542 dev_put(work->dev);
662f5533 543 kfree(work);
c2f17e82
HFS		 544}
545
27097255
YH		 546static void rt6_probe(struct rt6_info *rt)
547{
990edb42 548 struct __rt6_probe_work *work;
f2c31e32 549 struct neighbour *neigh;
27097255
YH		 550 /*
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.
554 *
555 * Router Reachability Probe MUST be rate-limited
556 * to no more than one per minute.
557 */
2152caea 558 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
7ff74a59 559 return;
2152caea
YH		 560 rcu_read_lock_bh();
561 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
562 if (neigh) {
8d6c31bf
MKL		 563 if (neigh->nud_state & NUD_VALID)
564 goto out;
565
990edb42 566 work = NULL;
2152caea 567 write_lock(&neigh->lock);
990edb42
MKL		 568 if (!(neigh->nud_state & NUD_VALID) &&
569 time_after(jiffies,
570 neigh->updated +
571 rt->rt6i_idev->cnf.rtr_probe_interval)) {
572 work = kmalloc(sizeof(*work), GFP_ATOMIC);
573 if (work)
574 __neigh_set_probe_once(neigh);
c2f17e82 575 }
2152caea 576 write_unlock(&neigh->lock);
990edb42
MKL		 577 } else {
578 work = kmalloc(sizeof(*work), GFP_ATOMIC);
f2c31e32 579 }
990edb42
MKL		 580
581 if (work) {
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);
587 }
588
8d6c31bf 589out:
2152caea 590 rcu_read_unlock_bh();
27097255
YH		 591}
592#else
593static inline void rt6_probe(struct rt6_info *rt)
594{
27097255
YH		 595}
596#endif
597
1da177e4 598/*
554cfb7e 599 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 600 */
b6f99a21 601static inline int rt6_check_dev(struct rt6_info *rt, int oif)
554cfb7e 602{
d1918542 603 struct net_device *dev = rt->dst.dev;
161980f4 604 if (!oif || dev->ifindex == oif)
554cfb7e 605 return 2;
161980f4
DM		 606 if ((dev->flags & IFF_LOOPBACK) &&
607 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
608 return 1;
609 return 0;
554cfb7e 610}
1da177e4 611
afc154e9 612static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
1da177e4 613{
f2c31e32 614 struct neighbour *neigh;
afc154e9 615 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
f2c31e32 616
4d0c5911
YH		 617 if (rt->rt6i_flags & RTF_NONEXTHOP ||
618 !(rt->rt6i_flags & RTF_GATEWAY))
afc154e9 619 return RT6_NUD_SUCCEED;
145a3621
YH		 620
621 rcu_read_lock_bh();
622 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
623 if (neigh) {
624 read_lock(&neigh->lock);
554cfb7e 625 if (neigh->nud_state & NUD_VALID)
afc154e9 626 ret = RT6_NUD_SUCCEED;
398bcbeb 627#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 628 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 629 ret = RT6_NUD_SUCCEED;
7e980569
JB		 630 else
631 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 632#endif
145a3621 633 read_unlock(&neigh->lock);
afc154e9
HFS		 634 } else {
635 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 636 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 637 }
145a3621
YH		 638 rcu_read_unlock_bh();
639
a5a81f0b 640 return ret;
1da177e4
LT		 641}
642
554cfb7e
YH		 643static int rt6_score_route(struct rt6_info *rt, int oif,
644 int strict)
1da177e4 645{
a5a81f0b 646 int m;
1ab1457c 647
4d0c5911 648 m = rt6_check_dev(rt, oif);
77d16f45 649 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 650 return RT6_NUD_FAIL_HARD;
ebacaaa0
YH		 651#ifdef CONFIG_IPV6_ROUTER_PREF
652 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
653#endif
afc154e9
HFS		 654 if (strict & RT6_LOOKUP_F_REACHABLE) {
655 int n = rt6_check_neigh(rt);
656 if (n < 0)
657 return n;
658 }
554cfb7e
YH		 659 return m;
660}
661
f11e6659 662static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
afc154e9
HFS		 663 int *mpri, struct rt6_info *match,
664 bool *do_rr)
554cfb7e 665{
f11e6659 666 int m;
afc154e9 667 bool match_do_rr = false;
35103d11
AG		 668 struct inet6_dev *idev = rt->rt6i_idev;
669 struct net_device *dev = rt->dst.dev;
670
671 if (dev && !netif_carrier_ok(dev) &&
672 idev->cnf.ignore_routes_with_linkdown)
673 goto out;
f11e6659
DM		 674
675 if (rt6_check_expired(rt))
676 goto out;
677
678 m = rt6_score_route(rt, oif, strict);
7e980569 679 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 680 match_do_rr = true;
681 m = 0; /* lowest valid score */
7e980569 682 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 683 goto out;
afc154e9
HFS		 684 }
685
686 if (strict & RT6_LOOKUP_F_REACHABLE)
687 rt6_probe(rt);
f11e6659 688
7e980569 689 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 690 if (m > *mpri) {
afc154e9 691 *do_rr = match_do_rr;
f11e6659
DM		 692 *mpri = m;
693 match = rt;
f11e6659 694 }
f11e6659
DM		 695out:
696 return match;
697}
698
699static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
700 struct rt6_info *rr_head,
afc154e9
HFS		 701 u32 metric, int oif, int strict,
702 bool *do_rr)
f11e6659 703{
9fbdcfaf 704 struct rt6_info *rt, *match, *cont;
554cfb7e 705 int mpri = -1;
1da177e4 706
f11e6659 707 match = NULL;
9fbdcfaf
SK		 708 cont = NULL;
709 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
710 if (rt->rt6i_metric != metric) {
711 cont = rt;
712 break;
713 }
714
715 match = find_match(rt, oif, strict, &mpri, match, do_rr);
716 }
717
718 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
719 if (rt->rt6i_metric != metric) {
720 cont = rt;
721 break;
722 }
723
afc154e9 724 match = find_match(rt, oif, strict, &mpri, match, do_rr);
9fbdcfaf
SK		 725 }
726
727 if (match || !cont)
728 return match;
729
730 for (rt = cont; rt; rt = rt->dst.rt6_next)
afc154e9 731 match = find_match(rt, oif, strict, &mpri, match, do_rr);
1da177e4 732
f11e6659
DM		 733 return match;
734}
1da177e4 735
f11e6659
DM		 736static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
737{
738 struct rt6_info *match, *rt0;
8ed67789 739 struct net *net;
afc154e9 740 bool do_rr = false;
1da177e4 741
f11e6659
DM		 742 rt0 = fn->rr_ptr;
743 if (!rt0)
744 fn->rr_ptr = rt0 = fn->leaf;
1da177e4 745
afc154e9
HFS		 746 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
747 &do_rr);
1da177e4 748
afc154e9 749 if (do_rr) {
d8d1f30b 750 struct rt6_info *next = rt0->dst.rt6_next;
f11e6659 751
554cfb7e 752 /* no entries matched; do round-robin */
f11e6659
DM		 753 if (!next || next->rt6i_metric != rt0->rt6i_metric)
754 next = fn->leaf;
755
756 if (next != rt0)
757 fn->rr_ptr = next;
1da177e4 758 }
1da177e4 759
d1918542 760 net = dev_net(rt0->dst.dev);
a02cec21 761 return match ? match : net->ipv6.ip6_null_entry;
1da177e4
LT		 762}
763
8b9df265
MKL		 764static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
765{
766 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
767}
768
70ceb4f5
YH		 769#ifdef CONFIG_IPV6_ROUTE_INFO
770int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 771 const struct in6_addr *gwaddr)
70ceb4f5 772{
c346dca1 773 struct net *net = dev_net(dev);
70ceb4f5
YH		 774 struct route_info *rinfo = (struct route_info *) opt;
775 struct in6_addr prefix_buf, *prefix;
776 unsigned int pref;
4bed72e4 777 unsigned long lifetime;
70ceb4f5
YH		 778 struct rt6_info *rt;
779
780 if (len < sizeof(struct route_info)) {
781 return -EINVAL;
782 }
783
784 /* Sanity check for prefix_len and length */
785 if (rinfo->length > 3) {
786 return -EINVAL;
787 } else if (rinfo->prefix_len > 128) {
788 return -EINVAL;
789 } else if (rinfo->prefix_len > 64) {
790 if (rinfo->length < 2) {
791 return -EINVAL;
792 }
793 } else if (rinfo->prefix_len > 0) {
794 if (rinfo->length < 1) {
795 return -EINVAL;
796 }
797 }
798
799 pref = rinfo->route_pref;
800 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 801 return -EINVAL;
70ceb4f5 802
4bed72e4 803 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 804
805 if (rinfo->length == 3)
806 prefix = (struct in6_addr *)rinfo->prefix;
807 else {
808 /* this function is safe */
809 ipv6_addr_prefix(&prefix_buf,
810 (struct in6_addr *)rinfo->prefix,
811 rinfo->prefix_len);
812 prefix = &prefix_buf;
813 }
814
f104a567
DJ		 815 if (rinfo->prefix_len == 0)
816 rt = rt6_get_dflt_router(gwaddr, dev);
817 else
818 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
819 gwaddr, dev->ifindex);
70ceb4f5
YH		 820
821 if (rt && !lifetime) {
e0a1ad73 822 ip6_del_rt(rt);
70ceb4f5
YH		 823 rt = NULL;
824 }
825
826 if (!rt && lifetime)
efa2cea0 827 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
70ceb4f5
YH		 828 pref);
829 else if (rt)
830 rt->rt6i_flags = RTF_ROUTEINFO |
831 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
832
833 if (rt) {
1716a961
G		 834 if (!addrconf_finite_timeout(lifetime))
835 rt6_clean_expires(rt);
836 else
837 rt6_set_expires(rt, jiffies + HZ * lifetime);
838
94e187c0 839 ip6_rt_put(rt);
70ceb4f5
YH		 840 }
841 return 0;
842}
843#endif
844
a3c00e46
MKL		 845static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
846 struct in6_addr *saddr)
847{
848 struct fib6_node *pn;
849 while (1) {
850 if (fn->fn_flags & RTN_TL_ROOT)
851 return NULL;
852 pn = fn->parent;
853 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
854 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
855 else
856 fn = pn;
857 if (fn->fn_flags & RTN_RTINFO)
858 return fn;
859 }
860}
c71099ac 861
8ed67789
DL		 862static struct rt6_info *ip6_pol_route_lookup(struct net *net,
863 struct fib6_table *table,
4c9483b2 864 struct flowi6 *fl6, int flags)
1da177e4
LT		 865{
866 struct fib6_node *fn;
867 struct rt6_info *rt;
868
c71099ac 869 read_lock_bh(&table->tb6_lock);
4c9483b2 870 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac
TG		 871restart:
872 rt = fn->leaf;
4c9483b2 873 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
51ebd318 874 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
52bd4c0c 875 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
a3c00e46
MKL		 876 if (rt == net->ipv6.ip6_null_entry) {
877 fn = fib6_backtrack(fn, &fl6->saddr);
878 if (fn)
879 goto restart;
880 }
d8d1f30b 881 dst_use(&rt->dst, jiffies);
c71099ac 882 read_unlock_bh(&table->tb6_lock);
c71099ac
TG		 883 return rt;
884
885}
886
67ba4152 887struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
ea6e574e
FW		 888 int flags)
889{
890 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
891}
892EXPORT_SYMBOL_GPL(ip6_route_lookup);
893
9acd9f3a
YH		 894struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
895 const struct in6_addr *saddr, int oif, int strict)
c71099ac 896{
4c9483b2
DM		 897 struct flowi6 fl6 = {
898 .flowi6_oif = oif,
899 .daddr = *daddr,
c71099ac
TG		 900 };
901 struct dst_entry *dst;
77d16f45 902 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 903
adaa70bb 904 if (saddr) {
4c9483b2 905 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 906 flags |= RT6_LOOKUP_F_HAS_SADDR;
907 }
908
4c9483b2 909 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
c71099ac
TG		 910 if (dst->error == 0)
911 return (struct rt6_info *) dst;
912
913 dst_release(dst);
914
1da177e4
LT		 915 return NULL;
916}
7159039a
YH		 917EXPORT_SYMBOL(rt6_lookup);
918
c71099ac 919/* ip6_ins_rt is called with FREE table->tb6_lock.
1da177e4
LT		 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
922 be destroyed.
923 */
924
e5fd387a 925static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
e715b6d3 926 struct mx6_config *mxc)
1da177e4
LT		 927{
928 int err;
c71099ac 929 struct fib6_table *table;
1da177e4 930
c71099ac
TG		 931 table = rt->rt6i_table;
932 write_lock_bh(&table->tb6_lock);
e715b6d3 933 err = fib6_add(&table->tb6_root, rt, info, mxc);
c71099ac 934 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 935
936 return err;
937}
938
40e22e8f
TG		 939int ip6_ins_rt(struct rt6_info *rt)
940{
e715b6d3
FW		 941 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
942 struct mx6_config mxc = { .mx = NULL, };
943
944 return __ip6_ins_rt(rt, &info, &mxc);
40e22e8f
TG		 945}
946
8b9df265
MKL		 947static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
948 const struct in6_addr *daddr,
949 const struct in6_addr *saddr)
1da177e4 950{
1da177e4
LT		 951 struct rt6_info *rt;
952
953 /*
954 * Clone the route.
955 */
956
d52d3997 957 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
83a09abd 958 ort = (struct rt6_info *)ort->dst.from;
1da177e4 959
ad706862 960 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
83a09abd
MKL		 961
962 if (!rt)
963 return NULL;
964
965 ip6_rt_copy_init(rt, ort);
966 rt->rt6i_flags |= RTF_CACHE;
967 rt->rt6i_metric = 0;
968 rt->dst.flags |= DST_HOST;
969 rt->rt6i_dst.addr = *daddr;
970 rt->rt6i_dst.plen = 128;
1da177e4 971
83a09abd
MKL		 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;
1da177e4 976#ifdef CONFIG_IPV6_SUBTREES
83a09abd
MKL		 977 if (rt->rt6i_src.plen && saddr) {
978 rt->rt6i_src.addr = *saddr;
979 rt->rt6i_src.plen = 128;
8b9df265 980 }
83a09abd 981#endif
95a9a5ba 982 }
1da177e4 983
95a9a5ba
YH		 984 return rt;
985}
1da177e4 986
d52d3997
MKL		 987static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
988{
989 struct rt6_info *pcpu_rt;
990
991 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
ad706862 992 rt->dst.dev, rt->dst.flags);
d52d3997
MKL		 993
994 if (!pcpu_rt)
995 return NULL;
996 ip6_rt_copy_init(pcpu_rt, rt);
997 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
998 pcpu_rt->rt6i_flags |= RTF_PCPU;
999 return pcpu_rt;
1000}
1001
1002/* It should be called with read_lock_bh(&tb6_lock) acquired */
1003static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
1004{
a73e4195 1005 struct rt6_info *pcpu_rt, **p;
d52d3997
MKL		 1006
1007 p = this_cpu_ptr(rt->rt6i_pcpu);
1008 pcpu_rt = *p;
1009
a73e4195
MKL		 1010 if (pcpu_rt) {
1011 dst_hold(&pcpu_rt->dst);
1012 rt6_dst_from_metrics_check(pcpu_rt);
1013 }
1014 return pcpu_rt;
1015}
1016
1017static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1018{
9c7370a1 1019 struct fib6_table *table = rt->rt6i_table;
a73e4195 1020 struct rt6_info *pcpu_rt, *prev, **p;
d52d3997
MKL		 1021
1022 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1023 if (!pcpu_rt) {
1024 struct net *net = dev_net(rt->dst.dev);
1025
9c7370a1
MKL		 1026 dst_hold(&net->ipv6.ip6_null_entry->dst);
1027 return net->ipv6.ip6_null_entry;
d52d3997
MKL		 1028 }
1029
9c7370a1
MKL		 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);
1034 if (prev) {
1035 /* If someone did it before us, return prev instead */
1036 dst_destroy(&pcpu_rt->dst);
1037 pcpu_rt = prev;
1038 }
1039 } else {
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.
1045 */
d52d3997 1046 dst_destroy(&pcpu_rt->dst);
9c7370a1 1047 pcpu_rt = rt;
d52d3997 1048 }
d52d3997
MKL		 1049 dst_hold(&pcpu_rt->dst);
1050 rt6_dst_from_metrics_check(pcpu_rt);
9c7370a1 1051 read_unlock_bh(&table->tb6_lock);
d52d3997
MKL		 1052 return pcpu_rt;
1053}
1054
8ed67789 1055static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
4c9483b2 1056 struct flowi6 *fl6, int flags)
1da177e4 1057{
367efcb9 1058 struct fib6_node *fn, *saved_fn;
45e4fd26 1059 struct rt6_info *rt;
c71099ac 1060 int strict = 0;
1da177e4 1061
77d16f45 1062 strict |= flags & RT6_LOOKUP_F_IFACE;
367efcb9
MKL		 1063 if (net->ipv6.devconf_all->forwarding == 0)
1064 strict |= RT6_LOOKUP_F_REACHABLE;
1da177e4 1065
c71099ac 1066 read_lock_bh(&table->tb6_lock);
1da177e4 1067
4c9483b2 1068 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 1069 saved_fn = fn;
1da177e4 1070
f1900fb5
DA		 1071 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1072 oif = 0;
1073
a3c00e46 1074redo_rt6_select:
367efcb9 1075 rt = rt6_select(fn, oif, strict);
52bd4c0c 1076 if (rt->rt6i_nsiblings)
367efcb9 1077 rt = rt6_multipath_select(rt, fl6, oif, strict);
a3c00e46
MKL		 1078 if (rt == net->ipv6.ip6_null_entry) {
1079 fn = fib6_backtrack(fn, &fl6->saddr);
1080 if (fn)
1081 goto redo_rt6_select;
367efcb9
MKL		 1082 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1083 /* also consider unreachable route */
1084 strict &= ~RT6_LOOKUP_F_REACHABLE;
1085 fn = saved_fn;
1086 goto redo_rt6_select;
367efcb9 1087 }
a3c00e46
MKL		 1088 }
1089
fb9de91e 1090
3da59bd9 1091 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
d52d3997
MKL		 1092 dst_use(&rt->dst, jiffies);
1093 read_unlock_bh(&table->tb6_lock);
1094
1095 rt6_dst_from_metrics_check(rt);
1096 return rt;
3da59bd9
MKL		 1097 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1098 !(rt->rt6i_flags & RTF_GATEWAY))) {
1099 /* Create a RTF_CACHE clone which will not be
1100 * owned by the fib6 tree. It is for the special case where
1101 * the daddr in the skb during the neighbor look-up is different
1102 * from the fl6->daddr used to look-up route here.
1103 */
1104
1105 struct rt6_info *uncached_rt;
1106
d52d3997
MKL		 1107 dst_use(&rt->dst, jiffies);
1108 read_unlock_bh(&table->tb6_lock);
1109
3da59bd9
MKL		 1110 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1111 dst_release(&rt->dst);
c71099ac 1112
3da59bd9 1113 if (uncached_rt)
8d0b94af 1114 rt6_uncached_list_add(uncached_rt);
3da59bd9
MKL		 1115 else
1116 uncached_rt = net->ipv6.ip6_null_entry;
d52d3997 1117
3da59bd9
MKL		 1118 dst_hold(&uncached_rt->dst);
1119 return uncached_rt;
3da59bd9 1120
d52d3997
MKL		 1121 } else {
1122 /* Get a percpu copy */
1123
1124 struct rt6_info *pcpu_rt;
1125
1126 rt->dst.lastuse = jiffies;
1127 rt->dst.__use++;
1128 pcpu_rt = rt6_get_pcpu_route(rt);
d52d3997 1129
9c7370a1
MKL		 1130 if (pcpu_rt) {
1131 read_unlock_bh(&table->tb6_lock);
1132 } else {
1133 /* We have to do the read_unlock first
1134 * because rt6_make_pcpu_route() may trigger
1135 * ip6_dst_gc() which will take the write_lock.
1136 */
1137 dst_hold(&rt->dst);
1138 read_unlock_bh(&table->tb6_lock);
a73e4195 1139 pcpu_rt = rt6_make_pcpu_route(rt);
9c7370a1
MKL		 1140 dst_release(&rt->dst);
1141 }
d52d3997
MKL		 1142
1143 return pcpu_rt;
9c7370a1 1144
d52d3997 1145 }
1da177e4
LT		 1146}
1147
8ed67789 1148static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
4c9483b2 1149 struct flowi6 *fl6, int flags)
4acad72d 1150{
4c9483b2 1151 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
4acad72d
PE		 1152}
1153
72331bc0
SL		 1154static struct dst_entry *ip6_route_input_lookup(struct net *net,
1155 struct net_device *dev,
1156 struct flowi6 *fl6, int flags)
1157{
1158 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1159 flags |= RT6_LOOKUP_F_IFACE;
1160
1161 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1162}
1163
c71099ac
TG		 1164void ip6_route_input(struct sk_buff *skb)
1165{
b71d1d42 1166 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 1167 struct net *net = dev_net(skb->dev);
adaa70bb 1168 int flags = RT6_LOOKUP_F_HAS_SADDR;
904af04d 1169 struct ip_tunnel_info *tun_info;
4c9483b2
DM		 1170 struct flowi6 fl6 = {
1171 .flowi6_iif = skb->dev->ifindex,
1172 .daddr = iph->daddr,
1173 .saddr = iph->saddr,
6502ca52 1174 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 1175 .flowi6_mark = skb->mark,
1176 .flowi6_proto = iph->nexthdr,
c71099ac 1177 };
adaa70bb 1178
904af04d 1179 tun_info = skb_tunnel_info(skb);
46fa062a 1180 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 1181 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
06e9d040 1182 skb_dst_drop(skb);
72331bc0 1183 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
c71099ac
TG		 1184}
1185
8ed67789 1186static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
4c9483b2 1187 struct flowi6 *fl6, int flags)
1da177e4 1188{
4c9483b2 1189 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
c71099ac
TG		 1190}
1191
67ba4152 1192struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
4c9483b2 1193 struct flowi6 *fl6)
c71099ac
TG		 1194{
1195 int flags = 0;
1196
1fb9489b 1197 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 1198
741a11d9
DA		 1199 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1200 fl6->flowi6_oif)
77d16f45 1201 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 1202
4c9483b2 1203 if (!ipv6_addr_any(&fl6->saddr))
adaa70bb 1204 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 1205 else if (sk)
1206 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 1207
4c9483b2 1208 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1da177e4 1209}
7159039a 1210EXPORT_SYMBOL(ip6_route_output);
1da177e4 1211
2774c131 1212struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 1213{
5c1e6aa3 1214 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
14e50e57
DM		 1215 struct dst_entry *new = NULL;
1216
f5b0a874 1217 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
14e50e57 1218 if (rt) {
0a1f5962 1219 rt6_info_init(rt);
8104891b 1220
0a1f5962 1221 new = &rt->dst;
14e50e57 1222 new->__use = 1;
352e512c 1223 new->input = dst_discard;
aad88724 1224 new->output = dst_discard_sk;
14e50e57 1225
0a1f5962 1226 dst_copy_metrics(new, &ort->dst);
14e50e57
DM		 1227 rt->rt6i_idev = ort->rt6i_idev;
1228 if (rt->rt6i_idev)
1229 in6_dev_hold(rt->rt6i_idev);
14e50e57 1230
4e3fd7a0 1231 rt->rt6i_gateway = ort->rt6i_gateway;
0a1f5962 1232 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
14e50e57
DM		 1233 rt->rt6i_metric = 0;
1234
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));
1238#endif
1239
1240 dst_free(new);
1241 }
1242
69ead7af
DM		 1243 dst_release(dst_orig);
1244 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 1245}
14e50e57 1246
1da177e4
LT		 1247/*
1248 * Destination cache support functions
1249 */
1250
4b32b5ad
MKL		 1251static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1252{
1253 if (rt->dst.from &&
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);
1256}
1257
3da59bd9
MKL		 1258static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1259{
1260 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1261 return NULL;
1262
1263 if (rt6_check_expired(rt))
1264 return NULL;
1265
1266 return &rt->dst;
1267}
1268
1269static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1270{
1271 if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1272 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1273 return &rt->dst;
1274 else
1275 return NULL;
1276}
1277
1da177e4
LT		 1278static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1279{
1280 struct rt6_info *rt;
1281
1282 rt = (struct rt6_info *) dst;
1283
6f3118b5
ND		 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.
1287 */
e3bc10bd 1288
4b32b5ad
MKL		 1289 rt6_dst_from_metrics_check(rt);
1290
d52d3997 1291 if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE))
3da59bd9
MKL		 1292 return rt6_dst_from_check(rt, cookie);
1293 else
1294 return rt6_check(rt, cookie);
1da177e4
LT		 1295}
1296
1297static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1298{
1299 struct rt6_info *rt = (struct rt6_info *) dst;
1300
1301 if (rt) {
54c1a859
YH		 1302 if (rt->rt6i_flags & RTF_CACHE) {
1303 if (rt6_check_expired(rt)) {
1304 ip6_del_rt(rt);
1305 dst = NULL;
1306 }
1307 } else {
1da177e4 1308 dst_release(dst);
54c1a859
YH		 1309 dst = NULL;
1310 }
1da177e4 1311 }
54c1a859 1312 return dst;
1da177e4
LT		 1313}
1314
1315static void ip6_link_failure(struct sk_buff *skb)
1316{
1317 struct rt6_info *rt;
1318
3ffe533c 1319 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 1320
adf30907 1321 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 1322 if (rt) {
1eb4f758
HFS		 1323 if (rt->rt6i_flags & RTF_CACHE) {
1324 dst_hold(&rt->dst);
8e3d5be7 1325 ip6_del_rt(rt);
1eb4f758 1326 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1da177e4 1327 rt->rt6i_node->fn_sernum = -1;
1eb4f758 1328 }
1da177e4
LT		 1329 }
1330}
1331
45e4fd26
MKL		 1332static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1333{
1334 struct net *net = dev_net(rt->dst.dev);
1335
1336 rt->rt6i_flags |= RTF_MODIFIED;
1337 rt->rt6i_pmtu = mtu;
1338 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1339}
1340
1341static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1342 const struct ipv6hdr *iph, u32 mtu)
1da177e4 1343{
67ba4152 1344 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 1345
45e4fd26
MKL		 1346 if (rt6->rt6i_flags & RTF_LOCAL)
1347 return;
81aded24 1348
45e4fd26
MKL		 1349 dst_confirm(dst);
1350 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1351 if (mtu >= dst_mtu(dst))
1352 return;
9d289715 1353
45e4fd26
MKL		 1354 if (rt6->rt6i_flags & RTF_CACHE) {
1355 rt6_do_update_pmtu(rt6, mtu);
1356 } else {
1357 const struct in6_addr *daddr, *saddr;
1358 struct rt6_info *nrt6;
1359
1360 if (iph) {
1361 daddr = &iph->daddr;
1362 saddr = &iph->saddr;
1363 } else if (sk) {
1364 daddr = &sk->sk_v6_daddr;
1365 saddr = &inet6_sk(sk)->saddr;
1366 } else {
1367 return;
1368 }
1369 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1370 if (nrt6) {
1371 rt6_do_update_pmtu(nrt6, mtu);
1372
1373 /* ip6_ins_rt(nrt6) will bump the
1374 * rt6->rt6i_node->fn_sernum
1375 * which will fail the next rt6_check() and
1376 * invalidate the sk->sk_dst_cache.
1377 */
1378 ip6_ins_rt(nrt6);
1379 }
1da177e4
LT		 1380 }
1381}
1382
45e4fd26
MKL		 1383static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1384 struct sk_buff *skb, u32 mtu)
1385{
1386 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1387}
1388
42ae66c8
DM		 1389void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1390 int oif, u32 mark)
81aded24
DM		 1391{
1392 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1393 struct dst_entry *dst;
1394 struct flowi6 fl6;
1395
1396 memset(&fl6, 0, sizeof(fl6));
1397 fl6.flowi6_oif = oif;
1b3c61dc 1398 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
81aded24
DM		 1399 fl6.daddr = iph->daddr;
1400 fl6.saddr = iph->saddr;
6502ca52 1401 fl6.flowlabel = ip6_flowinfo(iph);
81aded24
DM		 1402
1403 dst = ip6_route_output(net, NULL, &fl6);
1404 if (!dst->error)
45e4fd26 1405 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
81aded24
DM		 1406 dst_release(dst);
1407}
1408EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1409
1410void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1411{
1412 ip6_update_pmtu(skb, sock_net(sk), mtu,
1413 sk->sk_bound_dev_if, sk->sk_mark);
1414}
1415EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1416
b55b76b2
DJ		 1417/* Handle redirects */
1418struct ip6rd_flowi {
1419 struct flowi6 fl6;
1420 struct in6_addr gateway;
1421};
1422
1423static struct rt6_info *__ip6_route_redirect(struct net *net,
1424 struct fib6_table *table,
1425 struct flowi6 *fl6,
1426 int flags)
1427{
1428 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1429 struct rt6_info *rt;
1430 struct fib6_node *fn;
1431
1432 /* Get the "current" route for this destination and
1433 * check if the redirect has come from approriate router.
1434 *
1435 * RFC 4861 specifies that redirects should only be
1436 * accepted if they come from the nexthop to the target.
1437 * Due to the way the routes are chosen, this notion
1438 * is a bit fuzzy and one might need to check all possible
1439 * routes.
1440 */
1441
1442 read_lock_bh(&table->tb6_lock);
1443 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1444restart:
1445 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1446 if (rt6_check_expired(rt))
1447 continue;
1448 if (rt->dst.error)
1449 break;
1450 if (!(rt->rt6i_flags & RTF_GATEWAY))
1451 continue;
1452 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1453 continue;
1454 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1455 continue;
1456 break;
1457 }
1458
1459 if (!rt)
1460 rt = net->ipv6.ip6_null_entry;
1461 else if (rt->dst.error) {
1462 rt = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 1463 goto out;
1464 }
1465
1466 if (rt == net->ipv6.ip6_null_entry) {
a3c00e46
MKL		 1467 fn = fib6_backtrack(fn, &fl6->saddr);
1468 if (fn)
1469 goto restart;
b55b76b2 1470 }
a3c00e46 1471
b0a1ba59 1472out:
b55b76b2
DJ		 1473 dst_hold(&rt->dst);
1474
1475 read_unlock_bh(&table->tb6_lock);
1476
1477 return rt;
1478};
1479
1480static struct dst_entry *ip6_route_redirect(struct net *net,
1481 const struct flowi6 *fl6,
1482 const struct in6_addr *gateway)
1483{
1484 int flags = RT6_LOOKUP_F_HAS_SADDR;
1485 struct ip6rd_flowi rdfl;
1486
1487 rdfl.fl6 = *fl6;
1488 rdfl.gateway = *gateway;
1489
1490 return fib6_rule_lookup(net, &rdfl.fl6,
1491 flags, __ip6_route_redirect);
1492}
1493
3a5ad2ee
DM		 1494void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1495{
1496 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1497 struct dst_entry *dst;
1498 struct flowi6 fl6;
1499
1500 memset(&fl6, 0, sizeof(fl6));
e374c618 1501 fl6.flowi6_iif = LOOPBACK_IFINDEX;
3a5ad2ee
DM		 1502 fl6.flowi6_oif = oif;
1503 fl6.flowi6_mark = mark;
3a5ad2ee
DM		 1504 fl6.daddr = iph->daddr;
1505 fl6.saddr = iph->saddr;
6502ca52 1506 fl6.flowlabel = ip6_flowinfo(iph);
3a5ad2ee 1507
b55b76b2
DJ		 1508 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1509 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 1510 dst_release(dst);
1511}
1512EXPORT_SYMBOL_GPL(ip6_redirect);
1513
c92a59ec
DJ		 1514void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1515 u32 mark)
1516{
1517 const struct ipv6hdr *iph = ipv6_hdr(skb);
1518 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1519 struct dst_entry *dst;
1520 struct flowi6 fl6;
1521
1522 memset(&fl6, 0, sizeof(fl6));
e374c618 1523 fl6.flowi6_iif = LOOPBACK_IFINDEX;
c92a59ec
DJ		 1524 fl6.flowi6_oif = oif;
1525 fl6.flowi6_mark = mark;
c92a59ec
DJ		 1526 fl6.daddr = msg->dest;
1527 fl6.saddr = iph->daddr;
1528
b55b76b2
DJ		 1529 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1530 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 1531 dst_release(dst);
1532}
1533
3a5ad2ee
DM		 1534void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1535{
1536 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1537}
1538EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1539
0dbaee3b 1540static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 1541{
0dbaee3b
DM		 1542 struct net_device *dev = dst->dev;
1543 unsigned int mtu = dst_mtu(dst);
1544 struct net *net = dev_net(dev);
1545
1da177e4
LT		 1546 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1547
5578689a
DL		 1548 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1549 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 1550
1551 /*
1ab1457c
YH		 1552 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1553 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1554 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 1555 * rely only on pmtu discovery"
1556 */
1557 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1558 mtu = IPV6_MAXPLEN;
1559 return mtu;
1560}
1561
ebb762f2 1562static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 1563{
4b32b5ad
MKL		 1564 const struct rt6_info *rt = (const struct rt6_info *)dst;
1565 unsigned int mtu = rt->rt6i_pmtu;
d33e4553 1566 struct inet6_dev *idev;
618f9bc7 1567
4b32b5ad
MKL		 1568 if (mtu)
1569 goto out;
1570
1571 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 1572 if (mtu)
30f78d8e 1573 goto out;
618f9bc7
SK		 1574
1575 mtu = IPV6_MIN_MTU;
d33e4553
DM		 1576
1577 rcu_read_lock();
1578 idev = __in6_dev_get(dst->dev);
1579 if (idev)
1580 mtu = idev->cnf.mtu6;
1581 rcu_read_unlock();
1582
30f78d8e
ED		 1583out:
1584 return min_t(unsigned int, mtu, IP6_MAX_MTU);
d33e4553
DM		 1585}
1586
3b00944c
YH		 1587static struct dst_entry *icmp6_dst_gc_list;
1588static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1589
3b00944c 1590struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1591 struct flowi6 *fl6)
1da177e4 1592{
87a11578 1593 struct dst_entry *dst;
1da177e4
LT		 1594 struct rt6_info *rt;
1595 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1596 struct net *net = dev_net(dev);
1da177e4 1597
38308473 1598 if (unlikely(!idev))
122bdf67 1599 return ERR_PTR(-ENODEV);
1da177e4 1600
ad706862 1601 rt = ip6_dst_alloc(net, dev, 0);
38308473 1602 if (unlikely(!rt)) {
1da177e4 1603 in6_dev_put(idev);
87a11578 1604 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1605 goto out;
1606 }
1607
8e2ec639
YZ		 1608 rt->dst.flags |= DST_HOST;
1609 rt->dst.output = ip6_output;
d8d1f30b 1610 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1611 rt->rt6i_gateway = fl6->daddr;
87a11578 1612 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1613 rt->rt6i_dst.plen = 128;
1614 rt->rt6i_idev = idev;
14edd87d 1615 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1616
3b00944c 1617 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1618 rt->dst.next = icmp6_dst_gc_list;
1619 icmp6_dst_gc_list = &rt->dst;
3b00944c 1620 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1621
5578689a 1622 fib6_force_start_gc(net);
1da177e4 1623
87a11578
DM		 1624 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1625
1da177e4 1626out:
87a11578 1627 return dst;
1da177e4
LT		 1628}
1629
3d0f24a7 1630int icmp6_dst_gc(void)
1da177e4 1631{
e9476e95 1632 struct dst_entry *dst, **pprev;
3d0f24a7 1633 int more = 0;
1da177e4 1634
3b00944c
YH		 1635 spin_lock_bh(&icmp6_dst_lock);
1636 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1637
1da177e4
LT		 1638 while ((dst = *pprev) != NULL) {
1639 if (!atomic_read(&dst->__refcnt)) {
1640 *pprev = dst->next;
1641 dst_free(dst);
1da177e4
LT		 1642 } else {
1643 pprev = &dst->next;
3d0f24a7 1644 ++more;
1da177e4
LT		 1645 }
1646 }
1647
3b00944c 1648 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1649
3d0f24a7 1650 return more;
1da177e4
LT		 1651}
1652
1e493d19
DM		 1653static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1654 void *arg)
1655{
1656 struct dst_entry *dst, **pprev;
1657
1658 spin_lock_bh(&icmp6_dst_lock);
1659 pprev = &icmp6_dst_gc_list;
1660 while ((dst = *pprev) != NULL) {
1661 struct rt6_info *rt = (struct rt6_info *) dst;
1662 if (func(rt, arg)) {
1663 *pprev = dst->next;
1664 dst_free(dst);
1665 } else {
1666 pprev = &dst->next;
1667 }
1668 }
1669 spin_unlock_bh(&icmp6_dst_lock);
1670}
1671
569d3645 1672static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1673{
86393e52 1674 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1675 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1676 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1677 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1678 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1679 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1680 int entries;
7019b78e 1681
fc66f95c 1682 entries = dst_entries_get_fast(ops);
49a18d86 1683 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1684 entries <= rt_max_size)
1da177e4
LT		 1685 goto out;
1686
6891a346 1687 net->ipv6.ip6_rt_gc_expire++;
14956643 1688 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 1689 entries = dst_entries_get_slow(ops);
1690 if (entries < ops->gc_thresh)
7019b78e 1691 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1692out:
7019b78e 1693 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1694 return entries > rt_max_size;
1da177e4
LT		 1695}
1696
e715b6d3
FW		 1697static int ip6_convert_metrics(struct mx6_config *mxc,
1698 const struct fib6_config *cfg)
1699{
c3a8d947 1700 bool ecn_ca = false;
e715b6d3
FW		 1701 struct nlattr *nla;
1702 int remaining;
1703 u32 *mp;
1704
63159f29 1705 if (!cfg->fc_mx)
e715b6d3
FW		 1706 return 0;
1707
1708 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1709 if (unlikely(!mp))
1710 return -ENOMEM;
1711
1712 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1713 int type = nla_type(nla);
1bb14807 1714 u32 val;
e715b6d3 1715
1bb14807
DB		 1716 if (!type)
1717 continue;
1718 if (unlikely(type > RTAX_MAX))
1719 goto err;
ea697639 1720
1bb14807
DB		 1721 if (type == RTAX_CC_ALGO) {
1722 char tmp[TCP_CA_NAME_MAX];
e715b6d3 1723
1bb14807 1724 nla_strlcpy(tmp, nla, sizeof(tmp));
c3a8d947 1725 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1bb14807
DB		 1726 if (val == TCP_CA_UNSPEC)
1727 goto err;
1728 } else {
1729 val = nla_get_u32(nla);
e715b6d3 1730 }
b8d3e416
DB		 1731 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1732 goto err;
1bb14807
DB		 1733
1734 mp[type - 1] = val;
1735 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1736 }
1737
c3a8d947
DB		 1738 if (ecn_ca) {
1739 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1740 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1741 }
e715b6d3 1742
c3a8d947 1743 mxc->mx = mp;
e715b6d3
FW		 1744 return 0;
1745 err:
1746 kfree(mp);
1747 return -EINVAL;
1748}
1da177e4 1749
6b9ea5a6 1750int ip6_route_info_create(struct fib6_config *cfg, struct rt6_info **rt_ret)
1da177e4
LT		 1751{
1752 int err;
5578689a 1753 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1754 struct rt6_info *rt = NULL;
1755 struct net_device *dev = NULL;
1756 struct inet6_dev *idev = NULL;
c71099ac 1757 struct fib6_table *table;
1da177e4
LT		 1758 int addr_type;
1759
86872cb5 1760 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1da177e4
LT		 1761 return -EINVAL;
1762#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1763 if (cfg->fc_src_len)
1da177e4
LT		 1764 return -EINVAL;
1765#endif
86872cb5 1766 if (cfg->fc_ifindex) {
1da177e4 1767 err = -ENODEV;
5578689a 1768 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1769 if (!dev)
1770 goto out;
1771 idev = in6_dev_get(dev);
1772 if (!idev)
1773 goto out;
1774 }
1775
86872cb5
TG		 1776 if (cfg->fc_metric == 0)
1777 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1778
d71314b4 1779 err = -ENOBUFS;
38308473
DM		 1780 if (cfg->fc_nlinfo.nlh &&
1781 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1782 table = fib6_get_table(net, cfg->fc_table);
38308473 1783 if (!table) {
f3213831 1784 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1785 table = fib6_new_table(net, cfg->fc_table);
1786 }
1787 } else {
1788 table = fib6_new_table(net, cfg->fc_table);
1789 }
38308473
DM		 1790
1791 if (!table)
c71099ac 1792 goto out;
c71099ac 1793
ad706862
MKL		 1794 rt = ip6_dst_alloc(net, NULL,
1795 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1796
38308473 1797 if (!rt) {
1da177e4
LT		 1798 err = -ENOMEM;
1799 goto out;
1800 }
1801
1716a961
G		 1802 if (cfg->fc_flags & RTF_EXPIRES)
1803 rt6_set_expires(rt, jiffies +
1804 clock_t_to_jiffies(cfg->fc_expires));
1805 else
1806 rt6_clean_expires(rt);
1da177e4 1807
86872cb5
TG		 1808 if (cfg->fc_protocol == RTPROT_UNSPEC)
1809 cfg->fc_protocol = RTPROT_BOOT;
1810 rt->rt6i_protocol = cfg->fc_protocol;
1811
1812 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1813
1814 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1815 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1816 else if (cfg->fc_flags & RTF_LOCAL)
1817 rt->dst.input = ip6_input;
1da177e4 1818 else
d8d1f30b 1819 rt->dst.input = ip6_forward;
1da177e4 1820
d8d1f30b 1821 rt->dst.output = ip6_output;
1da177e4 1822
19e42e45
RP		 1823 if (cfg->fc_encap) {
1824 struct lwtunnel_state *lwtstate;
1825
1826 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
127eb7cd
TH		 1827 cfg->fc_encap, AF_INET6, cfg,
1828 &lwtstate);
19e42e45
RP		 1829 if (err)
1830 goto out;
61adedf3
JB		 1831 rt->dst.lwtstate = lwtstate_get(lwtstate);
1832 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1833 rt->dst.lwtstate->orig_output = rt->dst.output;
1834 rt->dst.output = lwtunnel_output;
25368623 1835 }
61adedf3
JB		 1836 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1837 rt->dst.lwtstate->orig_input = rt->dst.input;
1838 rt->dst.input = lwtunnel_input;
25368623 1839 }
19e42e45
RP		 1840 }
1841
86872cb5
TG		 1842 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1843 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1844 if (rt->rt6i_dst.plen == 128)
e5fd387a 1845 rt->dst.flags |= DST_HOST;
e5fd387a 1846
1da177e4 1847#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1848 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1849 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1850#endif
1851
86872cb5 1852 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1853
1854 /* We cannot add true routes via loopback here,
1855 they would result in kernel looping; promote them to reject routes
1856 */
86872cb5 1857 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1858 (dev && (dev->flags & IFF_LOOPBACK) &&
1859 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1860 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1861 /* hold loopback dev/idev if we haven't done so. */
5578689a 1862 if (dev != net->loopback_dev) {
1da177e4
LT		 1863 if (dev) {
1864 dev_put(dev);
1865 in6_dev_put(idev);
1866 }
5578689a 1867 dev = net->loopback_dev;
1da177e4
LT		 1868 dev_hold(dev);
1869 idev = in6_dev_get(dev);
1870 if (!idev) {
1871 err = -ENODEV;
1872 goto out;
1873 }
1874 }
1da177e4 1875 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1876 switch (cfg->fc_type) {
1877 case RTN_BLACKHOLE:
1878 rt->dst.error = -EINVAL;
aad88724 1879 rt->dst.output = dst_discard_sk;
7150aede 1880 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1881 break;
1882 case RTN_PROHIBIT:
1883 rt->dst.error = -EACCES;
7150aede
K		 1884 rt->dst.output = ip6_pkt_prohibit_out;
1885 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1886 break;
b4949ab2 1887 case RTN_THROW:
0315e382 1888 case RTN_UNREACHABLE:
ef2c7d7b 1889 default:
7150aede 1890 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
0315e382
NF		 1891 : (cfg->fc_type == RTN_UNREACHABLE)
1892 ? -EHOSTUNREACH : -ENETUNREACH;
7150aede
K		 1893 rt->dst.output = ip6_pkt_discard_out;
1894 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1895 break;
1896 }
1da177e4
LT		 1897 goto install_route;
1898 }
1899
86872cb5 1900 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1901 const struct in6_addr *gw_addr;
1da177e4
LT		 1902 int gwa_type;
1903
86872cb5 1904 gw_addr = &cfg->fc_gateway;
330567b7 1905 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1906
1907 /* if gw_addr is local we will fail to detect this in case
1908 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1909 * will return already-added prefix route via interface that
1910 * prefix route was assigned to, which might be non-loopback.
1911 */
1912 err = -EINVAL;
330567b7
FW		 1913 if (ipv6_chk_addr_and_flags(net, gw_addr,
1914 gwa_type & IPV6_ADDR_LINKLOCAL ?
1915 dev : NULL, 0, 0))
48ed7b26
FW		 1916 goto out;
1917
4e3fd7a0 1918 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1919
1920 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1921 struct rt6_info *grt;
1922
1923 /* IPv6 strictly inhibits using not link-local
1924 addresses as nexthop address.
1925 Otherwise, router will not able to send redirects.
1926 It is very good, but in some (rare!) circumstances
1927 (SIT, PtP, NBMA NOARP links) it is handy to allow
1928 some exceptions. --ANK
1929 */
38308473 1930 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1931 goto out;
1932
5578689a 1933 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1da177e4
LT		 1934
1935 err = -EHOSTUNREACH;
38308473 1936 if (!grt)
1da177e4
LT		 1937 goto out;
1938 if (dev) {
d1918542 1939 if (dev != grt->dst.dev) {
94e187c0 1940 ip6_rt_put(grt);
1da177e4
LT		 1941 goto out;
1942 }
1943 } else {
d1918542 1944 dev = grt->dst.dev;
1da177e4
LT		 1945 idev = grt->rt6i_idev;
1946 dev_hold(dev);
1947 in6_dev_hold(grt->rt6i_idev);
1948 }
38308473 1949 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 1950 err = 0;
94e187c0 1951 ip6_rt_put(grt);
1da177e4
LT		 1952
1953 if (err)
1954 goto out;
1955 }
1956 err = -EINVAL;
38308473 1957 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 1958 goto out;
1959 }
1960
1961 err = -ENODEV;
38308473 1962 if (!dev)
1da177e4
LT		 1963 goto out;
1964
c3968a85
DW		 1965 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1966 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1967 err = -EINVAL;
1968 goto out;
1969 }
4e3fd7a0 1970 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 1971 rt->rt6i_prefsrc.plen = 128;
1972 } else
1973 rt->rt6i_prefsrc.plen = 0;
1974
86872cb5 1975 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 1976
1977install_route:
d8d1f30b 1978 rt->dst.dev = dev;
1da177e4 1979 rt->rt6i_idev = idev;
c71099ac 1980 rt->rt6i_table = table;
63152fc0 1981
c346dca1 1982 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 1983
6b9ea5a6
RP		 1984 *rt_ret = rt;
1985
1986 return 0;
1987out:
1988 if (dev)
1989 dev_put(dev);
1990 if (idev)
1991 in6_dev_put(idev);
1992 if (rt)
1993 dst_free(&rt->dst);
1994
1995 *rt_ret = NULL;
1996
1997 return err;
1998}
1999
2000int ip6_route_add(struct fib6_config *cfg)
2001{
2002 struct mx6_config mxc = { .mx = NULL, };
2003 struct rt6_info *rt = NULL;
2004 int err;
2005
2006 err = ip6_route_info_create(cfg, &rt);
2007 if (err)
2008 goto out;
2009
e715b6d3
FW		 2010 err = ip6_convert_metrics(&mxc, cfg);
2011 if (err)
2012 goto out;
1da177e4 2013
e715b6d3
FW		 2014 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2015
2016 kfree(mxc.mx);
6b9ea5a6 2017
e715b6d3 2018 return err;
1da177e4 2019out:
1da177e4 2020 if (rt)
d8d1f30b 2021 dst_free(&rt->dst);
6b9ea5a6 2022
1da177e4
LT		 2023 return err;
2024}
2025
86872cb5 2026static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2027{
2028 int err;
c71099ac 2029 struct fib6_table *table;
d1918542 2030 struct net *net = dev_net(rt->dst.dev);
1da177e4 2031
8e3d5be7
MKL		 2032 if (rt == net->ipv6.ip6_null_entry ||
2033 rt->dst.flags & DST_NOCACHE) {
6825a26c
G		 2034 err = -ENOENT;
2035 goto out;
2036 }
6c813a72 2037
c71099ac
TG		 2038 table = rt->rt6i_table;
2039 write_lock_bh(&table->tb6_lock);
86872cb5 2040 err = fib6_del(rt, info);
c71099ac 2041 write_unlock_bh(&table->tb6_lock);
1da177e4 2042
6825a26c 2043out:
94e187c0 2044 ip6_rt_put(rt);
1da177e4
LT		 2045 return err;
2046}
2047
e0a1ad73
TG		 2048int ip6_del_rt(struct rt6_info *rt)
2049{
4d1169c1 2050 struct nl_info info = {
d1918542 2051 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2052 };
528c4ceb 2053 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2054}
2055
86872cb5 2056static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2057{
c71099ac 2058 struct fib6_table *table;
1da177e4
LT		 2059 struct fib6_node *fn;
2060 struct rt6_info *rt;
2061 int err = -ESRCH;
2062
5578689a 2063 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2064 if (!table)
c71099ac
TG		 2065 return err;
2066
2067 read_lock_bh(&table->tb6_lock);
1da177e4 2068
c71099ac 2069 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2070 &cfg->fc_dst, cfg->fc_dst_len,
2071 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2072
1da177e4 2073 if (fn) {
d8d1f30b 2074 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2075 if ((rt->rt6i_flags & RTF_CACHE) &&
2076 !(cfg->fc_flags & RTF_CACHE))
2077 continue;
86872cb5 2078 if (cfg->fc_ifindex &&
d1918542
DM		 2079 (!rt->dst.dev ||
2080 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2081 continue;
86872cb5
TG		 2082 if (cfg->fc_flags & RTF_GATEWAY &&
2083 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2084 continue;
86872cb5 2085 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2086 continue;
d8d1f30b 2087 dst_hold(&rt->dst);
c71099ac 2088 read_unlock_bh(&table->tb6_lock);
1da177e4 2089
86872cb5 2090 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2091 }
2092 }
c71099ac 2093 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2094
2095 return err;
2096}
2097
6700c270 2098static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2099{
e8599ff4 2100 struct net *net = dev_net(skb->dev);
a6279458 2101 struct netevent_redirect netevent;
e8599ff4 2102 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2103 struct ndisc_options ndopts;
2104 struct inet6_dev *in6_dev;
2105 struct neighbour *neigh;
71bcdba0 2106 struct rd_msg *msg;
6e157b6a
DM		 2107 int optlen, on_link;
2108 u8 *lladdr;
e8599ff4 2109
29a3cad5 2110 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2111 optlen -= sizeof(*msg);
e8599ff4
DM		 2112
2113 if (optlen < 0) {
6e157b6a 2114 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2115 return;
2116 }
2117
71bcdba0 2118 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2119
71bcdba0 2120 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2121 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2122 return;
2123 }
2124
6e157b6a 2125 on_link = 0;
71bcdba0 2126 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2127 on_link = 1;
71bcdba0 2128 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2129 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2130 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2131 return;
2132 }
2133
2134 in6_dev = __in6_dev_get(skb->dev);
2135 if (!in6_dev)
2136 return;
2137 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2138 return;
2139
2140 /* RFC2461 8.1:
2141 * The IP source address of the Redirect MUST be the same as the current
2142 * first-hop router for the specified ICMP Destination Address.
2143 */
2144
71bcdba0 2145 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2146 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2147 return;
2148 }
6e157b6a
DM		 2149
2150 lladdr = NULL;
e8599ff4
DM		 2151 if (ndopts.nd_opts_tgt_lladdr) {
2152 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2153 skb->dev);
2154 if (!lladdr) {
2155 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2156 return;
2157 }
2158 }
2159
6e157b6a
DM		 2160 rt = (struct rt6_info *) dst;
2161 if (rt == net->ipv6.ip6_null_entry) {
2162 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2163 return;
6e157b6a 2164 }
e8599ff4 2165
6e157b6a
DM		 2166 /* Redirect received -> path was valid.
2167 * Look, redirects are sent only in response to data packets,
2168 * so that this nexthop apparently is reachable. --ANK
2169 */
2170 dst_confirm(&rt->dst);
a6279458 2171
71bcdba0 2172 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2173 if (!neigh)
2174 return;
a6279458 2175
1da177e4
LT		 2176 /*
2177 * We have finally decided to accept it.
2178 */
2179
1ab1457c 2180 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 2181 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2182 NEIGH_UPDATE_F_OVERRIDE|
2183 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2184 NEIGH_UPDATE_F_ISROUTER))
2185 );
2186
83a09abd 2187 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2188 if (!nrt)
1da177e4
LT		 2189 goto out;
2190
2191 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2192 if (on_link)
2193 nrt->rt6i_flags &= ~RTF_GATEWAY;
2194
4e3fd7a0 2195 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2196
40e22e8f 2197 if (ip6_ins_rt(nrt))
1da177e4
LT		 2198 goto out;
2199
d8d1f30b
CG		 2200 netevent.old = &rt->dst;
2201 netevent.new = &nrt->dst;
71bcdba0 2202 netevent.daddr = &msg->dest;
60592833 2203 netevent.neigh = neigh;
8d71740c
TT		 2204 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2205
38308473 2206 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2207 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2208 ip6_del_rt(rt);
1da177e4
LT		 2209 }
2210
2211out:
e8599ff4 2212 neigh_release(neigh);
6e157b6a
DM		 2213}
2214
1da177e4
LT		 2215/*
2216 * Misc support functions
2217 */
2218
4b32b5ad
MKL		 2219static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2220{
2221 BUG_ON(from->dst.from);
2222
2223 rt->rt6i_flags &= ~RTF_EXPIRES;
2224 dst_hold(&from->dst);
2225 rt->dst.from = &from->dst;
2226 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2227}
2228
83a09abd
MKL		 2229static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2230{
2231 rt->dst.input = ort->dst.input;
2232 rt->dst.output = ort->dst.output;
2233 rt->rt6i_dst = ort->rt6i_dst;
2234 rt->dst.error = ort->dst.error;
2235 rt->rt6i_idev = ort->rt6i_idev;
2236 if (rt->rt6i_idev)
2237 in6_dev_hold(rt->rt6i_idev);
2238 rt->dst.lastuse = jiffies;
2239 rt->rt6i_gateway = ort->rt6i_gateway;
2240 rt->rt6i_flags = ort->rt6i_flags;
2241 rt6_set_from(rt, ort);
2242 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2243#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2244 rt->rt6i_src = ort->rt6i_src;
1da177e4 2245#endif
83a09abd
MKL		 2246 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2247 rt->rt6i_table = ort->rt6i_table;
61adedf3 2248 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2249}
2250
70ceb4f5 2251#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2252static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 2253 const struct in6_addr *prefix, int prefixlen,
2254 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 2255{
2256 struct fib6_node *fn;
2257 struct rt6_info *rt = NULL;
c71099ac
TG		 2258 struct fib6_table *table;
2259
efa2cea0 2260 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 2261 if (!table)
c71099ac 2262 return NULL;
70ceb4f5 2263
5744dd9b 2264 read_lock_bh(&table->tb6_lock);
67ba4152 2265 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2266 if (!fn)
2267 goto out;
2268
d8d1f30b 2269 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2270 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2271 continue;
2272 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2273 continue;
2274 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2275 continue;
d8d1f30b 2276 dst_hold(&rt->dst);
70ceb4f5
YH		 2277 break;
2278 }
2279out:
5744dd9b 2280 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2281 return rt;
2282}
2283
efa2cea0 2284static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 2285 const struct in6_addr *prefix, int prefixlen,
2286 const struct in6_addr *gwaddr, int ifindex,
95c96174 2287 unsigned int pref)
70ceb4f5 2288{
86872cb5
TG		 2289 struct fib6_config cfg = {
2290 .fc_table = RT6_TABLE_INFO,
238fc7ea 2291 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2292 .fc_ifindex = ifindex,
2293 .fc_dst_len = prefixlen,
2294 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2295 RTF_UP | RTF_PREF(pref),
15e47304 2296 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2297 .fc_nlinfo.nlh = NULL,
2298 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2299 };
2300
4e3fd7a0
AD		 2301 cfg.fc_dst = *prefix;
2302 cfg.fc_gateway = *gwaddr;
70ceb4f5 2303
e317da96
YH		 2304 /* We should treat it as a default route if prefix length is 0. */
2305 if (!prefixlen)
86872cb5 2306 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2307
86872cb5 2308 ip6_route_add(&cfg);
70ceb4f5 2309
efa2cea0 2310 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 2311}
2312#endif
2313
b71d1d42 2314struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2315{
1da177e4 2316 struct rt6_info *rt;
c71099ac 2317 struct fib6_table *table;
1da177e4 2318
c346dca1 2319 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 2320 if (!table)
c71099ac 2321 return NULL;
1da177e4 2322
5744dd9b 2323 read_lock_bh(&table->tb6_lock);
67ba4152 2324 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2325 if (dev == rt->dst.dev &&
045927ff 2326 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2327 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2328 break;
2329 }
2330 if (rt)
d8d1f30b 2331 dst_hold(&rt->dst);
5744dd9b 2332 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2333 return rt;
2334}
2335
b71d1d42 2336struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2337 struct net_device *dev,
2338 unsigned int pref)
1da177e4 2339{
86872cb5
TG		 2340 struct fib6_config cfg = {
2341 .fc_table = RT6_TABLE_DFLT,
238fc7ea 2342 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2343 .fc_ifindex = dev->ifindex,
2344 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2345 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2346 .fc_nlinfo.portid = 0,
5578689a 2347 .fc_nlinfo.nlh = NULL,
c346dca1 2348 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2349 };
1da177e4 2350
4e3fd7a0 2351 cfg.fc_gateway = *gwaddr;
1da177e4 2352
86872cb5 2353 ip6_route_add(&cfg);
1da177e4 2354
1da177e4
LT		 2355 return rt6_get_dflt_router(gwaddr, dev);
2356}
2357
7b4da532 2358void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2359{
2360 struct rt6_info *rt;
c71099ac
TG		 2361 struct fib6_table *table;
2362
2363 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2364 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2365 if (!table)
c71099ac 2366 return;
1da177e4
LT		 2367
2368restart:
c71099ac 2369 read_lock_bh(&table->tb6_lock);
d8d1f30b 2370 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2371 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2372 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2373 dst_hold(&rt->dst);
c71099ac 2374 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2375 ip6_del_rt(rt);
1da177e4
LT		 2376 goto restart;
2377 }
2378 }
c71099ac 2379 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2380}
2381
5578689a
DL		 2382static void rtmsg_to_fib6_config(struct net *net,
2383 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2384 struct fib6_config *cfg)
2385{
2386 memset(cfg, 0, sizeof(*cfg));
2387
2388 cfg->fc_table = RT6_TABLE_MAIN;
2389 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2390 cfg->fc_metric = rtmsg->rtmsg_metric;
2391 cfg->fc_expires = rtmsg->rtmsg_info;
2392 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2393 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2394 cfg->fc_flags = rtmsg->rtmsg_flags;
2395
5578689a 2396 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2397
4e3fd7a0
AD		 2398 cfg->fc_dst = rtmsg->rtmsg_dst;
2399 cfg->fc_src = rtmsg->rtmsg_src;
2400 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2401}
2402
5578689a 2403int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2404{
86872cb5 2405 struct fib6_config cfg;
1da177e4
LT		 2406 struct in6_rtmsg rtmsg;
2407 int err;
2408
67ba4152 2409 switch (cmd) {
1da177e4
LT		 2410 case SIOCADDRT: /* Add a route */
2411 case SIOCDELRT: /* Delete a route */
af31f412 2412 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2413 return -EPERM;
2414 err = copy_from_user(&rtmsg, arg,
2415 sizeof(struct in6_rtmsg));
2416 if (err)
2417 return -EFAULT;
86872cb5 2418
5578689a 2419 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2420
1da177e4
LT		 2421 rtnl_lock();
2422 switch (cmd) {
2423 case SIOCADDRT:
86872cb5 2424 err = ip6_route_add(&cfg);
1da177e4
LT		 2425 break;
2426 case SIOCDELRT:
86872cb5 2427 err = ip6_route_del(&cfg);
1da177e4
LT		 2428 break;
2429 default:
2430 err = -EINVAL;
2431 }
2432 rtnl_unlock();
2433
2434 return err;
3ff50b79 2435 }
1da177e4
LT		 2436
2437 return -EINVAL;
2438}
2439
2440/*
2441 * Drop the packet on the floor
2442 */
2443
d5fdd6ba 2444static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2445{
612f09e8 2446 int type;
adf30907 2447 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2448 switch (ipstats_mib_noroutes) {
2449 case IPSTATS_MIB_INNOROUTES:
0660e03f 2450 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2451 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2452 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2453 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2454 break;
2455 }
2456 /* FALLTHROUGH */
2457 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2458 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2459 ipstats_mib_noroutes);
612f09e8
YH		 2460 break;
2461 }
3ffe533c 2462 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2463 kfree_skb(skb);
2464 return 0;
2465}
2466
9ce8ade0
TG		 2467static int ip6_pkt_discard(struct sk_buff *skb)
2468{
612f09e8 2469 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2470}
2471
aad88724 2472static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
1da177e4 2473{
adf30907 2474 skb->dev = skb_dst(skb)->dev;
612f09e8 2475 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2476}
2477
9ce8ade0
TG		 2478static int ip6_pkt_prohibit(struct sk_buff *skb)
2479{
612f09e8 2480 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2481}
2482
aad88724 2483static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
9ce8ade0 2484{
adf30907 2485 skb->dev = skb_dst(skb)->dev;
612f09e8 2486 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2487}
2488
1da177e4
LT		 2489/*
2490 * Allocate a dst for local (unicast / anycast) address.
2491 */
2492
2493struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2494 const struct in6_addr *addr,
8f031519 2495 bool anycast)
1da177e4 2496{
c346dca1 2497 struct net *net = dev_net(idev->dev);
a3300ef4 2498 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
ad706862 2499 DST_NOCOUNT);
a3300ef4 2500 if (!rt)
1da177e4
LT		 2501 return ERR_PTR(-ENOMEM);
2502
1da177e4
LT		 2503 in6_dev_hold(idev);
2504
11d53b49 2505 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2506 rt->dst.input = ip6_input;
2507 rt->dst.output = ip6_output;
1da177e4 2508 rt->rt6i_idev = idev;
1da177e4
LT		 2509
2510 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2511 if (anycast)
2512 rt->rt6i_flags |= RTF_ANYCAST;
2513 else
1da177e4 2514 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2515
550bab42 2516 rt->rt6i_gateway = *addr;
4e3fd7a0 2517 rt->rt6i_dst.addr = *addr;
1da177e4 2518 rt->rt6i_dst.plen = 128;
5578689a 2519 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
8e3d5be7 2520 rt->dst.flags |= DST_NOCACHE;
1da177e4 2521
d8d1f30b 2522 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2523
2524 return rt;
2525}
2526
c3968a85
DW		 2527int ip6_route_get_saddr(struct net *net,
2528 struct rt6_info *rt,
b71d1d42 2529 const struct in6_addr *daddr,
c3968a85
DW		 2530 unsigned int prefs,
2531 struct in6_addr *saddr)
2532{
e16e888b
MS		 2533 struct inet6_dev *idev =
2534 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
c3968a85 2535 int err = 0;
e16e888b 2536 if (rt && rt->rt6i_prefsrc.plen)
4e3fd7a0 2537 *saddr = rt->rt6i_prefsrc.addr;
c3968a85
DW		 2538 else
2539 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2540 daddr, prefs, saddr);
2541 return err;
2542}
2543
2544/* remove deleted ip from prefsrc entries */
2545struct arg_dev_net_ip {
2546 struct net_device *dev;
2547 struct net *net;
2548 struct in6_addr *addr;
2549};
2550
2551static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2552{
2553 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2554 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2555 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2556
d1918542 2557 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2558 rt != net->ipv6.ip6_null_entry &&
2559 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2560 /* remove prefsrc entry */
2561 rt->rt6i_prefsrc.plen = 0;
2562 }
2563 return 0;
2564}
2565
2566void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2567{
2568 struct net *net = dev_net(ifp->idev->dev);
2569 struct arg_dev_net_ip adni = {
2570 .dev = ifp->idev->dev,
2571 .net = net,
2572 .addr = &ifp->addr,
2573 };
0c3584d5 2574 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2575}
2576
be7a010d
DJ		 2577#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2578#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2579
2580/* Remove routers and update dst entries when gateway turn into host. */
2581static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2582{
2583 struct in6_addr *gateway = (struct in6_addr *)arg;
2584
2585 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2586 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2587 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2588 return -1;
2589 }
2590 return 0;
2591}
2592
2593void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2594{
2595 fib6_clean_all(net, fib6_clean_tohost, gateway);
2596}
2597
8ed67789
DL		 2598struct arg_dev_net {
2599 struct net_device *dev;
2600 struct net *net;
2601};
2602
1da177e4
LT		 2603static int fib6_ifdown(struct rt6_info *rt, void *arg)
2604{
bc3ef660 2605 const struct arg_dev_net *adn = arg;
2606 const struct net_device *dev = adn->dev;
8ed67789 2607
d1918542 2608 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2609 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2610 return -1;
c159d30c 2611
1da177e4
LT		 2612 return 0;
2613}
2614
f3db4851 2615void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2616{
8ed67789
DL		 2617 struct arg_dev_net adn = {
2618 .dev = dev,
2619 .net = net,
2620 };
2621
0c3584d5 2622 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2623 icmp6_clean_all(fib6_ifdown, &adn);
e332bc67
EB		 2624 if (dev)
2625 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2626}
2627
95c96174 2628struct rt6_mtu_change_arg {
1da177e4 2629 struct net_device *dev;
95c96174 2630 unsigned int mtu;
1da177e4
LT		 2631};
2632
2633static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2634{
2635 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2636 struct inet6_dev *idev;
2637
2638 /* In IPv6 pmtu discovery is not optional,
2639 so that RTAX_MTU lock cannot disable it.
2640 We still use this lock to block changes
2641 caused by addrconf/ndisc.
2642 */
2643
2644 idev = __in6_dev_get(arg->dev);
38308473 2645 if (!idev)
1da177e4
LT		 2646 return 0;
2647
2648 /* For administrative MTU increase, there is no way to discover
2649 IPv6 PMTU increase, so PMTU increase should be updated here.
2650 Since RFC 1981 doesn't include administrative MTU increase
2651 update PMTU increase is a MUST. (i.e. jumbo frame)
2652 */
2653 /*
2654 If new MTU is less than route PMTU, this new MTU will be the
2655 lowest MTU in the path, update the route PMTU to reflect PMTU
2656 decreases; if new MTU is greater than route PMTU, and the
2657 old MTU is the lowest MTU in the path, update the route PMTU
2658 to reflect the increase. In this case if the other nodes' MTU
2659 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2660 PMTU discouvery.
2661 */
d1918542 2662 if (rt->dst.dev == arg->dev &&
4b32b5ad
MKL		 2663 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2664 if (rt->rt6i_flags & RTF_CACHE) {
2665 /* For RTF_CACHE with rt6i_pmtu == 0
2666 * (i.e. a redirected route),
2667 * the metrics of its rt->dst.from has already
2668 * been updated.
2669 */
2670 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2671 rt->rt6i_pmtu = arg->mtu;
2672 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2673 (dst_mtu(&rt->dst) < arg->mtu &&
2674 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2675 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2676 }
566cfd8f 2677 }
1da177e4
LT		 2678 return 0;
2679}
2680
95c96174 2681void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2682{
c71099ac
TG		 2683 struct rt6_mtu_change_arg arg = {
2684 .dev = dev,
2685 .mtu = mtu,
2686 };
1da177e4 2687
0c3584d5 2688 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2689}
2690
ef7c79ed 2691static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2692 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2693 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2694 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2695 [RTA_PRIORITY] = { .type = NLA_U32 },
2696 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2697 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2698 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2699 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2700 [RTA_ENCAP] = { .type = NLA_NESTED },
86872cb5
TG		 2701};
2702
2703static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2704 struct fib6_config *cfg)
1da177e4 2705{
86872cb5
TG		 2706 struct rtmsg *rtm;
2707 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2708 unsigned int pref;
86872cb5 2709 int err;
1da177e4 2710
86872cb5
TG		 2711 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2712 if (err < 0)
2713 goto errout;
1da177e4 2714
86872cb5
TG		 2715 err = -EINVAL;
2716 rtm = nlmsg_data(nlh);
2717 memset(cfg, 0, sizeof(*cfg));
2718
2719 cfg->fc_table = rtm->rtm_table;
2720 cfg->fc_dst_len = rtm->rtm_dst_len;
2721 cfg->fc_src_len = rtm->rtm_src_len;
2722 cfg->fc_flags = RTF_UP;
2723 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2724 cfg->fc_type = rtm->rtm_type;
86872cb5 2725
ef2c7d7b
ND		 2726 if (rtm->rtm_type == RTN_UNREACHABLE ||
2727 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2728 rtm->rtm_type == RTN_PROHIBIT ||
2729 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2730 cfg->fc_flags |= RTF_REJECT;
2731
ab79ad14
MŻ		 2732 if (rtm->rtm_type == RTN_LOCAL)
2733 cfg->fc_flags |= RTF_LOCAL;
2734
1f56a01f
MKL		 2735 if (rtm->rtm_flags & RTM_F_CLONED)
2736 cfg->fc_flags |= RTF_CACHE;
2737
15e47304 2738 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2739 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2740 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2741
2742 if (tb[RTA_GATEWAY]) {
67b61f6c 2743 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2744 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2745 }
86872cb5
TG		 2746
2747 if (tb[RTA_DST]) {
2748 int plen = (rtm->rtm_dst_len + 7) >> 3;
2749
2750 if (nla_len(tb[RTA_DST]) < plen)
2751 goto errout;
2752
2753 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2754 }
86872cb5
TG		 2755
2756 if (tb[RTA_SRC]) {
2757 int plen = (rtm->rtm_src_len + 7) >> 3;
2758
2759 if (nla_len(tb[RTA_SRC]) < plen)
2760 goto errout;
2761
2762 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2763 }
86872cb5 2764
c3968a85 2765 if (tb[RTA_PREFSRC])
67b61f6c 2766 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2767
86872cb5
TG		 2768 if (tb[RTA_OIF])
2769 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2770
2771 if (tb[RTA_PRIORITY])
2772 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2773
2774 if (tb[RTA_METRICS]) {
2775 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2776 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2777 }
86872cb5
TG		 2778
2779 if (tb[RTA_TABLE])
2780 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2781
51ebd318
ND		 2782 if (tb[RTA_MULTIPATH]) {
2783 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2784 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2785 }
2786
c78ba6d6
LR		 2787 if (tb[RTA_PREF]) {
2788 pref = nla_get_u8(tb[RTA_PREF]);
2789 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2790 pref != ICMPV6_ROUTER_PREF_HIGH)
2791 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2792 cfg->fc_flags |= RTF_PREF(pref);
2793 }
2794
19e42e45
RP		 2795 if (tb[RTA_ENCAP])
2796 cfg->fc_encap = tb[RTA_ENCAP];
2797
2798 if (tb[RTA_ENCAP_TYPE])
2799 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2800
86872cb5
TG		 2801 err = 0;
2802errout:
2803 return err;
1da177e4
LT		 2804}
2805
6b9ea5a6
RP		 2806struct rt6_nh {
2807 struct rt6_info *rt6_info;
2808 struct fib6_config r_cfg;
2809 struct mx6_config mxc;
2810 struct list_head next;
2811};
2812
2813static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2814{
2815 struct rt6_nh *nh;
2816
2817 list_for_each_entry(nh, rt6_nh_list, next) {
2818 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2819 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2820 nh->r_cfg.fc_ifindex);
2821 }
2822}
2823
2824static int ip6_route_info_append(struct list_head *rt6_nh_list,
2825 struct rt6_info *rt, struct fib6_config *r_cfg)
2826{
2827 struct rt6_nh *nh;
2828 struct rt6_info *rtnh;
2829 int err = -EEXIST;
2830
2831 list_for_each_entry(nh, rt6_nh_list, next) {
2832 /* check if rt6_info already exists */
2833 rtnh = nh->rt6_info;
2834
2835 if (rtnh->dst.dev == rt->dst.dev &&
2836 rtnh->rt6i_idev == rt->rt6i_idev &&
2837 ipv6_addr_equal(&rtnh->rt6i_gateway,
2838 &rt->rt6i_gateway))
2839 return err;
2840 }
2841
2842 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2843 if (!nh)
2844 return -ENOMEM;
2845 nh->rt6_info = rt;
2846 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2847 if (err) {
2848 kfree(nh);
2849 return err;
2850 }
2851 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2852 list_add_tail(&nh->next, rt6_nh_list);
2853
2854 return 0;
2855}
2856
2857static int ip6_route_multipath_add(struct fib6_config *cfg)
51ebd318
ND		 2858{
2859 struct fib6_config r_cfg;
2860 struct rtnexthop *rtnh;
6b9ea5a6
RP		 2861 struct rt6_info *rt;
2862 struct rt6_nh *err_nh;
2863 struct rt6_nh *nh, *nh_safe;
51ebd318
ND		 2864 int remaining;
2865 int attrlen;
6b9ea5a6
RP		 2866 int err = 1;
2867 int nhn = 0;
2868 int replace = (cfg->fc_nlinfo.nlh &&
2869 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2870 LIST_HEAD(rt6_nh_list);
51ebd318 2871
35f1b4e9 2872 remaining = cfg->fc_mp_len;
51ebd318 2873 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 2874
6b9ea5a6
RP		 2875 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2876 * rt6_info structs per nexthop
2877 */
51ebd318
ND		 2878 while (rtnh_ok(rtnh, remaining)) {
2879 memcpy(&r_cfg, cfg, sizeof(*cfg));
2880 if (rtnh->rtnh_ifindex)
2881 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2882
2883 attrlen = rtnh_attrlen(rtnh);
2884 if (attrlen > 0) {
2885 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2886
2887 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2888 if (nla) {
67b61f6c 2889 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 2890 r_cfg.fc_flags |= RTF_GATEWAY;
2891 }
19e42e45
RP		 2892 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2893 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2894 if (nla)
2895 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 2896 }
6b9ea5a6
RP		 2897
2898 err = ip6_route_info_create(&r_cfg, &rt);
2899 if (err)
2900 goto cleanup;
2901
2902 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
51ebd318 2903 if (err) {
6b9ea5a6
RP		 2904 dst_free(&rt->dst);
2905 goto cleanup;
2906 }
2907
2908 rtnh = rtnh_next(rtnh, &remaining);
2909 }
2910
2911 err_nh = NULL;
2912 list_for_each_entry(nh, &rt6_nh_list, next) {
2913 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2914 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2915 nh->rt6_info = NULL;
2916 if (err) {
2917 if (replace && nhn)
2918 ip6_print_replace_route_err(&rt6_nh_list);
2919 err_nh = nh;
2920 goto add_errout;
51ebd318 2921 }
6b9ea5a6 2922
1a72418b 2923 /* Because each route is added like a single route we remove
27596472
MK		 2924 * these flags after the first nexthop: if there is a collision,
2925 * we have already failed to add the first nexthop:
2926 * fib6_add_rt2node() has rejected it; when replacing, old
2927 * nexthops have been replaced by first new, the rest should
2928 * be added to it.
1a72418b 2929 */
27596472
MK		 2930 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2931 NLM_F_REPLACE);
6b9ea5a6
RP		 2932 nhn++;
2933 }
2934
2935 goto cleanup;
2936
2937add_errout:
2938 /* Delete routes that were already added */
2939 list_for_each_entry(nh, &rt6_nh_list, next) {
2940 if (err_nh == nh)
2941 break;
2942 ip6_route_del(&nh->r_cfg);
2943 }
2944
2945cleanup:
2946 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
2947 if (nh->rt6_info)
2948 dst_free(&nh->rt6_info->dst);
52fe51f8 2949 kfree(nh->mxc.mx);
6b9ea5a6
RP		 2950 list_del(&nh->next);
2951 kfree(nh);
2952 }
2953
2954 return err;
2955}
2956
2957static int ip6_route_multipath_del(struct fib6_config *cfg)
2958{
2959 struct fib6_config r_cfg;
2960 struct rtnexthop *rtnh;
2961 int remaining;
2962 int attrlen;
2963 int err = 1, last_err = 0;
2964
2965 remaining = cfg->fc_mp_len;
2966 rtnh = (struct rtnexthop *)cfg->fc_mp;
2967
2968 /* Parse a Multipath Entry */
2969 while (rtnh_ok(rtnh, remaining)) {
2970 memcpy(&r_cfg, cfg, sizeof(*cfg));
2971 if (rtnh->rtnh_ifindex)
2972 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2973
2974 attrlen = rtnh_attrlen(rtnh);
2975 if (attrlen > 0) {
2976 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2977
2978 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2979 if (nla) {
2980 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2981 r_cfg.fc_flags |= RTF_GATEWAY;
2982 }
2983 }
2984 err = ip6_route_del(&r_cfg);
2985 if (err)
2986 last_err = err;
2987
51ebd318
ND		 2988 rtnh = rtnh_next(rtnh, &remaining);
2989 }
2990
2991 return last_err;
2992}
2993
67ba4152 2994static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2995{
86872cb5
TG		 2996 struct fib6_config cfg;
2997 int err;
1da177e4 2998
86872cb5
TG		 2999 err = rtm_to_fib6_config(skb, nlh, &cfg);
3000 if (err < 0)
3001 return err;
3002
51ebd318 3003 if (cfg.fc_mp)
6b9ea5a6 3004 return ip6_route_multipath_del(&cfg);
51ebd318
ND		 3005 else
3006 return ip6_route_del(&cfg);
1da177e4
LT		 3007}
3008
67ba4152 3009static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3010{
86872cb5
TG		 3011 struct fib6_config cfg;
3012 int err;
1da177e4 3013
86872cb5
TG		 3014 err = rtm_to_fib6_config(skb, nlh, &cfg);
3015 if (err < 0)
3016 return err;
3017
51ebd318 3018 if (cfg.fc_mp)
6b9ea5a6 3019 return ip6_route_multipath_add(&cfg);
51ebd318
ND		 3020 else
3021 return ip6_route_add(&cfg);
1da177e4
LT		 3022}
3023
19e42e45 3024static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 3025{
3026 return NLMSG_ALIGN(sizeof(struct rtmsg))
3027 + nla_total_size(16) /* RTA_SRC */
3028 + nla_total_size(16) /* RTA_DST */
3029 + nla_total_size(16) /* RTA_GATEWAY */
3030 + nla_total_size(16) /* RTA_PREFSRC */
3031 + nla_total_size(4) /* RTA_TABLE */
3032 + nla_total_size(4) /* RTA_IIF */
3033 + nla_total_size(4) /* RTA_OIF */
3034 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 3035 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 3036 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 3037 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 3038 + nla_total_size(1) /* RTA_PREF */
61adedf3 3039 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 3040}
3041
191cd582
BH		 3042static int rt6_fill_node(struct net *net,
3043 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 3044 struct in6_addr *dst, struct in6_addr *src,
15e47304 3045 int iif, int type, u32 portid, u32 seq,
7bc570c8 3046 int prefix, int nowait, unsigned int flags)
1da177e4 3047{
4b32b5ad 3048 u32 metrics[RTAX_MAX];
1da177e4 3049 struct rtmsg *rtm;
2d7202bf 3050 struct nlmsghdr *nlh;
e3703b3d 3051 long expires;
9e762a4a 3052 u32 table;
1da177e4
LT		 3053
3054 if (prefix) { /* user wants prefix routes only */
3055 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3056 /* success since this is not a prefix route */
3057 return 1;
3058 }
3059 }
3060
15e47304 3061 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 3062 if (!nlh)
26932566 3063 return -EMSGSIZE;
2d7202bf
TG		 3064
3065 rtm = nlmsg_data(nlh);
1da177e4
LT		 3066 rtm->rtm_family = AF_INET6;
3067 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3068 rtm->rtm_src_len = rt->rt6i_src.plen;
3069 rtm->rtm_tos = 0;
c71099ac 3070 if (rt->rt6i_table)
9e762a4a 3071 table = rt->rt6i_table->tb6_id;
c71099ac 3072 else
9e762a4a
PM		 3073 table = RT6_TABLE_UNSPEC;
3074 rtm->rtm_table = table;
c78679e8
DM		 3075 if (nla_put_u32(skb, RTA_TABLE, table))
3076 goto nla_put_failure;
ef2c7d7b
ND		 3077 if (rt->rt6i_flags & RTF_REJECT) {
3078 switch (rt->dst.error) {
3079 case -EINVAL:
3080 rtm->rtm_type = RTN_BLACKHOLE;
3081 break;
3082 case -EACCES:
3083 rtm->rtm_type = RTN_PROHIBIT;
3084 break;
b4949ab2
ND		 3085 case -EAGAIN:
3086 rtm->rtm_type = RTN_THROW;
3087 break;
ef2c7d7b
ND		 3088 default:
3089 rtm->rtm_type = RTN_UNREACHABLE;
3090 break;
3091 }
3092 }
38308473 3093 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 3094 rtm->rtm_type = RTN_LOCAL;
d1918542 3095 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 3096 rtm->rtm_type = RTN_LOCAL;
3097 else
3098 rtm->rtm_type = RTN_UNICAST;
3099 rtm->rtm_flags = 0;
35103d11 3100 if (!netif_carrier_ok(rt->dst.dev)) {
cea45e20 3101 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 3102 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3103 rtm->rtm_flags |= RTNH_F_DEAD;
3104 }
1da177e4
LT		 3105 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3106 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 3107 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 3108 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 3109 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3110 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3111 rtm->rtm_protocol = RTPROT_RA;
3112 else
3113 rtm->rtm_protocol = RTPROT_KERNEL;
3114 }
1da177e4 3115
38308473 3116 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 3117 rtm->rtm_flags |= RTM_F_CLONED;
3118
3119 if (dst) {
930345ea 3120 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 3121 goto nla_put_failure;
1ab1457c 3122 rtm->rtm_dst_len = 128;
1da177e4 3123 } else if (rtm->rtm_dst_len)
930345ea 3124 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 3125 goto nla_put_failure;
1da177e4
LT		 3126#ifdef CONFIG_IPV6_SUBTREES
3127 if (src) {
930345ea 3128 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 3129 goto nla_put_failure;
1ab1457c 3130 rtm->rtm_src_len = 128;
c78679e8 3131 } else if (rtm->rtm_src_len &&
930345ea 3132 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 3133 goto nla_put_failure;
1da177e4 3134#endif
7bc570c8
YH		 3135 if (iif) {
3136#ifdef CONFIG_IPV6_MROUTE
3137 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
8229efda 3138 int err = ip6mr_get_route(net, skb, rtm, nowait);
7bc570c8
YH		 3139 if (err <= 0) {
3140 if (!nowait) {
3141 if (err == 0)
3142 return 0;
3143 goto nla_put_failure;
3144 } else {
3145 if (err == -EMSGSIZE)
3146 goto nla_put_failure;
3147 }
3148 }
3149 } else
3150#endif
c78679e8
DM		 3151 if (nla_put_u32(skb, RTA_IIF, iif))
3152 goto nla_put_failure;
7bc570c8 3153 } else if (dst) {
1da177e4 3154 struct in6_addr saddr_buf;
c78679e8 3155 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3156 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3157 goto nla_put_failure;
1da177e4 3158 }
2d7202bf 3159
c3968a85
DW		 3160 if (rt->rt6i_prefsrc.plen) {
3161 struct in6_addr saddr_buf;
4e3fd7a0 3162 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3163 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3164 goto nla_put_failure;
c3968a85
DW		 3165 }
3166
4b32b5ad
MKL		 3167 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3168 if (rt->rt6i_pmtu)
3169 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3170 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3171 goto nla_put_failure;
3172
dd0cbf29 3173 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3174 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3175 goto nla_put_failure;
94f826b8 3176 }
2d7202bf 3177
c78679e8
DM		 3178 if (rt->dst.dev &&
3179 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3180 goto nla_put_failure;
3181 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3182 goto nla_put_failure;
8253947e
LW		 3183
3184 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3185
87a50699 3186 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3187 goto nla_put_failure;
2d7202bf 3188
c78ba6d6
LR		 3189 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3190 goto nla_put_failure;
3191
61adedf3 3192 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
19e42e45 3193
053c095a
JB		 3194 nlmsg_end(skb, nlh);
3195 return 0;
2d7202bf
TG		 3196
3197nla_put_failure:
26932566
PM		 3198 nlmsg_cancel(skb, nlh);
3199 return -EMSGSIZE;
1da177e4
LT		 3200}
3201
1b43af54 3202int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3203{
3204 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3205 int prefix;
3206
2d7202bf
TG		 3207 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3208 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 3209 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3210 } else
3211 prefix = 0;
3212
191cd582
BH		 3213 return rt6_fill_node(arg->net,
3214 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3215 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 3216 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 3217}
3218
67ba4152 3219static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3220{
3b1e0a65 3221 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3222 struct nlattr *tb[RTA_MAX+1];
3223 struct rt6_info *rt;
1da177e4 3224 struct sk_buff *skb;
ab364a6f 3225 struct rtmsg *rtm;
4c9483b2 3226 struct flowi6 fl6;
72331bc0 3227 int err, iif = 0, oif = 0;
1da177e4 3228
ab364a6f
TG		 3229 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3230 if (err < 0)
3231 goto errout;
1da177e4 3232
ab364a6f 3233 err = -EINVAL;
4c9483b2 3234 memset(&fl6, 0, sizeof(fl6));
1da177e4 3235
ab364a6f
TG		 3236 if (tb[RTA_SRC]) {
3237 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3238 goto errout;
3239
4e3fd7a0 3240 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3241 }
3242
3243 if (tb[RTA_DST]) {
3244 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3245 goto errout;
3246
4e3fd7a0 3247 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3248 }
3249
3250 if (tb[RTA_IIF])
3251 iif = nla_get_u32(tb[RTA_IIF]);
3252
3253 if (tb[RTA_OIF])
72331bc0 3254 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3255
2e47b291
LC		 3256 if (tb[RTA_MARK])
3257 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3258
1da177e4
LT		 3259 if (iif) {
3260 struct net_device *dev;
72331bc0
SL		 3261 int flags = 0;
3262
5578689a 3263 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3264 if (!dev) {
3265 err = -ENODEV;
ab364a6f 3266 goto errout;
1da177e4 3267 }
72331bc0
SL		 3268
3269 fl6.flowi6_iif = iif;
3270
3271 if (!ipv6_addr_any(&fl6.saddr))
3272 flags |= RT6_LOOKUP_F_HAS_SADDR;
3273
3274 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3275 flags);
3276 } else {
3277 fl6.flowi6_oif = oif;
3278
3279 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3280 }
3281
ab364a6f 3282 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3283 if (!skb) {
94e187c0 3284 ip6_rt_put(rt);
ab364a6f
TG		 3285 err = -ENOBUFS;
3286 goto errout;
3287 }
1da177e4 3288
ab364a6f
TG		 3289 /* Reserve room for dummy headers, this skb can pass
3290 through good chunk of routing engine.
3291 */
459a98ed 3292 skb_reset_mac_header(skb);
ab364a6f 3293 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 3294
d8d1f30b 3295 skb_dst_set(skb, &rt->dst);
1da177e4 3296
4c9483b2 3297 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3298 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 3299 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 3300 if (err < 0) {
ab364a6f
TG		 3301 kfree_skb(skb);
3302 goto errout;
1da177e4
LT		 3303 }
3304
15e47304 3305 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3306errout:
1da177e4 3307 return err;
1da177e4
LT		 3308}
3309
37a1d361
RP		 3310void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3311 unsigned int nlm_flags)
1da177e4
LT		 3312{
3313 struct sk_buff *skb;
5578689a 3314 struct net *net = info->nl_net;
528c4ceb
DL		 3315 u32 seq;
3316 int err;
3317
3318 err = -ENOBUFS;
38308473 3319 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3320
19e42e45 3321 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3322 if (!skb)
21713ebc
TG		 3323 goto errout;
3324
191cd582 3325 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
37a1d361 3326 event, info->portid, seq, 0, 0, nlm_flags);
26932566
PM		 3327 if (err < 0) {
3328 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3329 WARN_ON(err == -EMSGSIZE);
3330 kfree_skb(skb);
3331 goto errout;
3332 }
15e47304 3333 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3334 info->nlh, gfp_any());
3335 return;
21713ebc
TG		 3336errout:
3337 if (err < 0)
5578689a 3338 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3339}
3340
8ed67789 3341static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3342 unsigned long event, void *ptr)
8ed67789 3343{
351638e7 3344 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3345 struct net *net = dev_net(dev);
8ed67789
DL		 3346
3347 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3348 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3349 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3350#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3351 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3352 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3353 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3354 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3355#endif
3356 }
3357
3358 return NOTIFY_OK;
3359}
3360
1da177e4
LT		 3361/*
3362 * /proc
3363 */
3364
3365#ifdef CONFIG_PROC_FS
3366
33120b30
AD		 3367static const struct file_operations ipv6_route_proc_fops = {
3368 .owner = THIS_MODULE,
3369 .open = ipv6_route_open,
3370 .read = seq_read,
3371 .llseek = seq_lseek,
8d2ca1d7 3372 .release = seq_release_net,
33120b30
AD		 3373};
3374
1da177e4
LT		 3375static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3376{
69ddb805 3377 struct net *net = (struct net *)seq->private;
1da177e4 3378 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3379 net->ipv6.rt6_stats->fib_nodes,
3380 net->ipv6.rt6_stats->fib_route_nodes,
3381 net->ipv6.rt6_stats->fib_rt_alloc,
3382 net->ipv6.rt6_stats->fib_rt_entries,
3383 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3384 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3385 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3386
3387 return 0;
3388}
3389
3390static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3391{
de05c557 3392 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3393}
3394
9a32144e 3395static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3396 .owner = THIS_MODULE,
3397 .open = rt6_stats_seq_open,
3398 .read = seq_read,
3399 .llseek = seq_lseek,
b6fcbdb4 3400 .release = single_release_net,
1da177e4
LT		 3401};
3402#endif /* CONFIG_PROC_FS */
3403
3404#ifdef CONFIG_SYSCTL
3405
1da177e4 3406static
fe2c6338 3407int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3408 void __user *buffer, size_t *lenp, loff_t *ppos)
3409{
c486da34
LAG		 3410 struct net *net;
3411 int delay;
3412 if (!write)
1da177e4 3413 return -EINVAL;
c486da34
LAG		 3414
3415 net = (struct net *)ctl->extra1;
3416 delay = net->ipv6.sysctl.flush_delay;
3417 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3418 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3419 return 0;
1da177e4
LT		 3420}
3421
fe2c6338 3422struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3423 {
1da177e4 3424 .procname = "flush",
4990509f 3425 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3426 .maxlen = sizeof(int),
89c8b3a1 3427 .mode = 0200,
6d9f239a 3428 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3429 },
3430 {
1da177e4 3431 .procname = "gc_thresh",
9a7ec3a9 3432 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3433 .maxlen = sizeof(int),
3434 .mode = 0644,
6d9f239a 3435 .proc_handler = proc_dointvec,
1da177e4
LT		 3436 },
3437 {
1da177e4 3438 .procname = "max_size",
4990509f 3439 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3440 .maxlen = sizeof(int),
3441 .mode = 0644,
6d9f239a 3442 .proc_handler = proc_dointvec,
1da177e4
LT		 3443 },
3444 {
1da177e4 3445 .procname = "gc_min_interval",
4990509f 3446 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3447 .maxlen = sizeof(int),
3448 .mode = 0644,
6d9f239a 3449 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3450 },
3451 {
1da177e4 3452 .procname = "gc_timeout",
4990509f 3453 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3454 .maxlen = sizeof(int),
3455 .mode = 0644,
6d9f239a 3456 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3457 },
3458 {
1da177e4 3459 .procname = "gc_interval",
4990509f 3460 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3461 .maxlen = sizeof(int),
3462 .mode = 0644,
6d9f239a 3463 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3464 },
3465 {
1da177e4 3466 .procname = "gc_elasticity",
4990509f 3467 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3468 .maxlen = sizeof(int),
3469 .mode = 0644,
f3d3f616 3470 .proc_handler = proc_dointvec,
1da177e4
LT		 3471 },
3472 {
1da177e4 3473 .procname = "mtu_expires",
4990509f 3474 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3475 .maxlen = sizeof(int),
3476 .mode = 0644,
6d9f239a 3477 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3478 },
3479 {
1da177e4 3480 .procname = "min_adv_mss",
4990509f 3481 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3482 .maxlen = sizeof(int),
3483 .mode = 0644,
f3d3f616 3484 .proc_handler = proc_dointvec,
1da177e4
LT		 3485 },
3486 {
1da177e4 3487 .procname = "gc_min_interval_ms",
4990509f 3488 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3489 .maxlen = sizeof(int),
3490 .mode = 0644,
6d9f239a 3491 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3492 },
f8572d8f 3493 { }
1da177e4
LT		 3494};
3495
2c8c1e72 3496struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3497{
3498 struct ctl_table *table;
3499
3500 table = kmemdup(ipv6_route_table_template,
3501 sizeof(ipv6_route_table_template),
3502 GFP_KERNEL);
5ee09105
YH		 3503
3504 if (table) {
3505 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3506 table[0].extra1 = net;
86393e52 3507 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3508 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3509 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3510 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3511 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3512 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3513 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3514 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3515 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3516
3517 /* Don't export sysctls to unprivileged users */
3518 if (net->user_ns != &init_user_ns)
3519 table[0].procname = NULL;
5ee09105
YH		 3520 }
3521
760f2d01
DL		 3522 return table;
3523}
1da177e4
LT		 3524#endif
3525
2c8c1e72 3526static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3527{
633d424b 3528 int ret = -ENOMEM;
8ed67789 3529
86393e52
AD		 3530 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3531 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3532
fc66f95c
ED		 3533 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3534 goto out_ip6_dst_ops;
3535
8ed67789
DL		 3536 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3537 sizeof(*net->ipv6.ip6_null_entry),
3538 GFP_KERNEL);
3539 if (!net->ipv6.ip6_null_entry)
fc66f95c 3540 goto out_ip6_dst_entries;
d8d1f30b 3541 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3542 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3543 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3544 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3545 ip6_template_metrics, true);
8ed67789
DL		 3546
3547#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3548 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3549 sizeof(*net->ipv6.ip6_prohibit_entry),
3550 GFP_KERNEL);
68fffc67
PZ		 3551 if (!net->ipv6.ip6_prohibit_entry)
3552 goto out_ip6_null_entry;
d8d1f30b 3553 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3554 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3555 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3556 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3557 ip6_template_metrics, true);
8ed67789
DL		 3558
3559 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3560 sizeof(*net->ipv6.ip6_blk_hole_entry),
3561 GFP_KERNEL);
68fffc67
PZ		 3562 if (!net->ipv6.ip6_blk_hole_entry)
3563 goto out_ip6_prohibit_entry;
d8d1f30b 3564 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3565 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3566 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3567 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3568 ip6_template_metrics, true);
8ed67789
DL		 3569#endif
3570
b339a47c
PZ		 3571 net->ipv6.sysctl.flush_delay = 0;
3572 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3573 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3574 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3575 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3576 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3577 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3578 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3579
6891a346
BT		 3580 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3581
8ed67789
DL		 3582 ret = 0;
3583out:
3584 return ret;
f2fc6a54 3585
68fffc67
PZ		 3586#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3587out_ip6_prohibit_entry:
3588 kfree(net->ipv6.ip6_prohibit_entry);
3589out_ip6_null_entry:
3590 kfree(net->ipv6.ip6_null_entry);
3591#endif
fc66f95c
ED		 3592out_ip6_dst_entries:
3593 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3594out_ip6_dst_ops:
f2fc6a54 3595 goto out;
cdb18761
DL		 3596}
3597
2c8c1e72 3598static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3599{
8ed67789
DL		 3600 kfree(net->ipv6.ip6_null_entry);
3601#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3602 kfree(net->ipv6.ip6_prohibit_entry);
3603 kfree(net->ipv6.ip6_blk_hole_entry);
3604#endif
41bb78b4 3605 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3606}
3607
d189634e
TG		 3608static int __net_init ip6_route_net_init_late(struct net *net)
3609{
3610#ifdef CONFIG_PROC_FS
d4beaa66
G		 3611 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3612 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3613#endif
3614 return 0;
3615}
3616
3617static void __net_exit ip6_route_net_exit_late(struct net *net)
3618{
3619#ifdef CONFIG_PROC_FS
ece31ffd
G		 3620 remove_proc_entry("ipv6_route", net->proc_net);
3621 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3622#endif
3623}
3624
cdb18761
DL		 3625static struct pernet_operations ip6_route_net_ops = {
3626 .init = ip6_route_net_init,
3627 .exit = ip6_route_net_exit,
3628};
3629
c3426b47
DM		 3630static int __net_init ipv6_inetpeer_init(struct net *net)
3631{
3632 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3633
3634 if (!bp)
3635 return -ENOMEM;
3636 inet_peer_base_init(bp);
3637 net->ipv6.peers = bp;
3638 return 0;
3639}
3640
3641static void __net_exit ipv6_inetpeer_exit(struct net *net)
3642{
3643 struct inet_peer_base *bp = net->ipv6.peers;
3644
3645 net->ipv6.peers = NULL;
56a6b248 3646 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3647 kfree(bp);
3648}
3649
2b823f72 3650static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3651 .init = ipv6_inetpeer_init,
3652 .exit = ipv6_inetpeer_exit,
3653};
3654
d189634e
TG		 3655static struct pernet_operations ip6_route_net_late_ops = {
3656 .init = ip6_route_net_init_late,
3657 .exit = ip6_route_net_exit_late,
3658};
3659
8ed67789
DL		 3660static struct notifier_block ip6_route_dev_notifier = {
3661 .notifier_call = ip6_route_dev_notify,
3662 .priority = 0,
3663};
3664
433d49c3 3665int __init ip6_route_init(void)
1da177e4 3666{
433d49c3 3667 int ret;
8d0b94af 3668 int cpu;
433d49c3 3669
9a7ec3a9
DL		 3670 ret = -ENOMEM;
3671 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3672 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3673 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3674 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3675 goto out;
14e50e57 3676
fc66f95c 3677 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3678 if (ret)
bdb3289f 3679 goto out_kmem_cache;
bdb3289f 3680
c3426b47
DM		 3681 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3682 if (ret)
e8803b6c 3683 goto out_dst_entries;
2a0c451a 3684
7e52b33b
DM		 3685 ret = register_pernet_subsys(&ip6_route_net_ops);
3686 if (ret)
3687 goto out_register_inetpeer;
c3426b47 3688
5dc121e9
AE		 3689 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3690
8ed67789
DL		 3691 /* Registering of the loopback is done before this portion of code,
3692 * the loopback reference in rt6_info will not be taken, do it
3693 * manually for init_net */
d8d1f30b 3694 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3695 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3696 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3697 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3698 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3699 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3700 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3701 #endif
e8803b6c 3702 ret = fib6_init();
433d49c3 3703 if (ret)
8ed67789 3704 goto out_register_subsys;
433d49c3 3705
433d49c3
DL		 3706 ret = xfrm6_init();
3707 if (ret)
e8803b6c 3708 goto out_fib6_init;
c35b7e72 3709
433d49c3
DL		 3710 ret = fib6_rules_init();
3711 if (ret)
3712 goto xfrm6_init;
7e5449c2 3713
d189634e
TG		 3714 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3715 if (ret)
3716 goto fib6_rules_init;
3717
433d49c3 3718 ret = -ENOBUFS;
c7ac8679
GR		 3719 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3720 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3721 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3722 goto out_register_late_subsys;
c127ea2c 3723
8ed67789 3724 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3725 if (ret)
d189634e 3726 goto out_register_late_subsys;
8ed67789 3727
8d0b94af
MKL		 3728 for_each_possible_cpu(cpu) {
3729 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3730
3731 INIT_LIST_HEAD(&ul->head);
3732 spin_lock_init(&ul->lock);
3733 }
3734
433d49c3
DL		 3735out:
3736 return ret;
3737
d189634e
TG		 3738out_register_late_subsys:
3739 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3740fib6_rules_init:
433d49c3
DL		 3741 fib6_rules_cleanup();
3742xfrm6_init:
433d49c3 3743 xfrm6_fini();
2a0c451a
TG		 3744out_fib6_init:
3745 fib6_gc_cleanup();
8ed67789
DL		 3746out_register_subsys:
3747 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3748out_register_inetpeer:
3749 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3750out_dst_entries:
3751 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3752out_kmem_cache:
f2fc6a54 3753 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3754 goto out;
1da177e4
LT		 3755}
3756
3757void ip6_route_cleanup(void)
3758{
8ed67789 3759 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3760 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3761 fib6_rules_cleanup();
1da177e4 3762 xfrm6_fini();
1da177e4 3763 fib6_gc_cleanup();
c3426b47 3764 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3765 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3766 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3767 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3768}
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