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usbnet: remove invalid check
[deliverable/linux.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
145 for_each_possible_cpu(cpu) {
146 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
147 struct rt6_info *rt;
148
149 spin_lock_bh(&ul->lock);
150 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
151 struct inet6_dev *rt_idev = rt->rt6i_idev;
152 struct net_device *rt_dev = rt->dst.dev;
153
154 if (rt_idev && (rt_idev->dev == dev || !dev) &&
155 rt_idev->dev != loopback_dev) {
156 rt->rt6i_idev = in6_dev_get(loopback_dev);
157 in6_dev_put(rt_idev);
158 }
159
160 if (rt_dev && (rt_dev == dev || !dev) &&
161 rt_dev != loopback_dev) {
162 rt->dst.dev = loopback_dev;
163 dev_hold(rt->dst.dev);
164 dev_put(rt_dev);
165 }
166 }
167 spin_unlock_bh(&ul->lock);
168 }
169}
170
d52d3997
MKL		 171static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
172{
173 return dst_metrics_write_ptr(rt->dst.from);
174}
175
06582540
DM		 176static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
177{
4b32b5ad 178 struct rt6_info *rt = (struct rt6_info *)dst;
06582540 179
d52d3997
MKL		 180 if (rt->rt6i_flags & RTF_PCPU)
181 return rt6_pcpu_cow_metrics(rt);
182 else if (rt->rt6i_flags & RTF_CACHE)
4b32b5ad
MKL		 183 return NULL;
184 else
3b471175 185 return dst_cow_metrics_generic(dst, old);
06582540
DM		 186}
187
f894cbf8
DM		 188static inline const void *choose_neigh_daddr(struct rt6_info *rt,
189 struct sk_buff *skb,
190 const void *daddr)
39232973
DM		 191{
192 struct in6_addr *p = &rt->rt6i_gateway;
193
a7563f34 194 if (!ipv6_addr_any(p))
39232973 195 return (const void *) p;
f894cbf8
DM		 196 else if (skb)
197 return &ipv6_hdr(skb)->daddr;
39232973
DM		 198 return daddr;
199}
200
f894cbf8
DM		 201static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
202 struct sk_buff *skb,
203 const void *daddr)
d3aaeb38 204{
39232973
DM		 205 struct rt6_info *rt = (struct rt6_info *) dst;
206 struct neighbour *n;
207
f894cbf8 208 daddr = choose_neigh_daddr(rt, skb, daddr);
8e022ee6 209 n = __ipv6_neigh_lookup(dst->dev, daddr);
f83c7790
DM		 210 if (n)
211 return n;
212 return neigh_create(&nd_tbl, daddr, dst->dev);
213}
214
9a7ec3a9 215static struct dst_ops ip6_dst_ops_template = {
1da177e4 216 .family = AF_INET6,
1da177e4
LT		 217 .gc = ip6_dst_gc,
218 .gc_thresh = 1024,
219 .check = ip6_dst_check,
0dbaee3b 220 .default_advmss = ip6_default_advmss,
ebb762f2 221 .mtu = ip6_mtu,
06582540 222 .cow_metrics = ipv6_cow_metrics,
1da177e4
LT		 223 .destroy = ip6_dst_destroy,
224 .ifdown = ip6_dst_ifdown,
225 .negative_advice = ip6_negative_advice,
226 .link_failure = ip6_link_failure,
227 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 228 .redirect = rt6_do_redirect,
1ac06e03 229 .local_out = __ip6_local_out,
d3aaeb38 230 .neigh_lookup = ip6_neigh_lookup,
1da177e4
LT		 231};
232
ebb762f2 233static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
ec831ea7 234{
618f9bc7
SK		 235 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
236
237 return mtu ? : dst->dev->mtu;
ec831ea7
RD		 238}
239
6700c270
DM		 240static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
241 struct sk_buff *skb, u32 mtu)
14e50e57
DM		 242{
243}
244
6700c270
DM		 245static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
246 struct sk_buff *skb)
b587ee3b
DM		 247{
248}
249
0972ddb2
HB		 250static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
251 unsigned long old)
252{
253 return NULL;
254}
255
14e50e57
DM		 256static struct dst_ops ip6_dst_blackhole_ops = {
257 .family = AF_INET6,
14e50e57
DM		 258 .destroy = ip6_dst_destroy,
259 .check = ip6_dst_check,
ebb762f2 260 .mtu = ip6_blackhole_mtu,
214f45c9 261 .default_advmss = ip6_default_advmss,
14e50e57 262 .update_pmtu = ip6_rt_blackhole_update_pmtu,
b587ee3b 263 .redirect = ip6_rt_blackhole_redirect,
0972ddb2 264 .cow_metrics = ip6_rt_blackhole_cow_metrics,
d3aaeb38 265 .neigh_lookup = ip6_neigh_lookup,
14e50e57
DM		 266};
267
62fa8a84 268static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 269 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 270};
271
fb0af4c7 272static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 273 .dst = {
274 .__refcnt = ATOMIC_INIT(1),
275 .__use = 1,
2c20cbd7 276 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 277 .error = -ENETUNREACH,
d8d1f30b
CG		 278 .input = ip6_pkt_discard,
279 .output = ip6_pkt_discard_out,
1da177e4
LT		 280 },
281 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 282 .rt6i_protocol = RTPROT_KERNEL,
1da177e4
LT		 283 .rt6i_metric = ~(u32) 0,
284 .rt6i_ref = ATOMIC_INIT(1),
285};
286
101367c2
TG		 287#ifdef CONFIG_IPV6_MULTIPLE_TABLES
288
fb0af4c7 289static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 290 .dst = {
291 .__refcnt = ATOMIC_INIT(1),
292 .__use = 1,
2c20cbd7 293 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 294 .error = -EACCES,
d8d1f30b
CG		 295 .input = ip6_pkt_prohibit,
296 .output = ip6_pkt_prohibit_out,
101367c2
TG		 297 },
298 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 299 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 300 .rt6i_metric = ~(u32) 0,
301 .rt6i_ref = ATOMIC_INIT(1),
302};
303
fb0af4c7 304static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 305 .dst = {
306 .__refcnt = ATOMIC_INIT(1),
307 .__use = 1,
2c20cbd7 308 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 309 .error = -EINVAL,
d8d1f30b 310 .input = dst_discard,
aad88724 311 .output = dst_discard_sk,
101367c2
TG		 312 },
313 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 314 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 315 .rt6i_metric = ~(u32) 0,
316 .rt6i_ref = ATOMIC_INIT(1),
317};
318
319#endif
320
1da177e4 321/* allocate dst with ip6_dst_ops */
d52d3997
MKL		 322static struct rt6_info *__ip6_dst_alloc(struct net *net,
323 struct net_device *dev,
ad706862 324 int flags)
1da177e4 325{
97bab73f 326 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
6f3118b5 327 0, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 328
97bab73f 329 if (rt) {
8104891b
SK		 330 struct dst_entry *dst = &rt->dst;
331
332 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
51ebd318 333 INIT_LIST_HEAD(&rt->rt6i_siblings);
8d0b94af 334 INIT_LIST_HEAD(&rt->rt6i_uncached);
97bab73f 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
a3c00e46 1071redo_rt6_select:
367efcb9 1072 rt = rt6_select(fn, oif, strict);
52bd4c0c 1073 if (rt->rt6i_nsiblings)
367efcb9 1074 rt = rt6_multipath_select(rt, fl6, oif, strict);
a3c00e46
MKL		 1075 if (rt == net->ipv6.ip6_null_entry) {
1076 fn = fib6_backtrack(fn, &fl6->saddr);
1077 if (fn)
1078 goto redo_rt6_select;
367efcb9
MKL		 1079 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1080 /* also consider unreachable route */
1081 strict &= ~RT6_LOOKUP_F_REACHABLE;
1082 fn = saved_fn;
1083 goto redo_rt6_select;
367efcb9 1084 }
a3c00e46
MKL		 1085 }
1086
fb9de91e 1087
3da59bd9 1088 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
d52d3997
MKL		 1089 dst_use(&rt->dst, jiffies);
1090 read_unlock_bh(&table->tb6_lock);
1091
1092 rt6_dst_from_metrics_check(rt);
1093 return rt;
3da59bd9
MKL		 1094 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1095 !(rt->rt6i_flags & RTF_GATEWAY))) {
1096 /* Create a RTF_CACHE clone which will not be
1097 * owned by the fib6 tree. It is for the special case where
1098 * the daddr in the skb during the neighbor look-up is different
1099 * from the fl6->daddr used to look-up route here.
1100 */
1101
1102 struct rt6_info *uncached_rt;
1103
d52d3997
MKL		 1104 dst_use(&rt->dst, jiffies);
1105 read_unlock_bh(&table->tb6_lock);
1106
3da59bd9
MKL		 1107 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1108 dst_release(&rt->dst);
c71099ac 1109
3da59bd9 1110 if (uncached_rt)
8d0b94af 1111 rt6_uncached_list_add(uncached_rt);
3da59bd9
MKL		 1112 else
1113 uncached_rt = net->ipv6.ip6_null_entry;
d52d3997 1114
3da59bd9
MKL		 1115 dst_hold(&uncached_rt->dst);
1116 return uncached_rt;
3da59bd9 1117
d52d3997
MKL		 1118 } else {
1119 /* Get a percpu copy */
1120
1121 struct rt6_info *pcpu_rt;
1122
1123 rt->dst.lastuse = jiffies;
1124 rt->dst.__use++;
1125 pcpu_rt = rt6_get_pcpu_route(rt);
d52d3997 1126
9c7370a1
MKL		 1127 if (pcpu_rt) {
1128 read_unlock_bh(&table->tb6_lock);
1129 } else {
1130 /* We have to do the read_unlock first
1131 * because rt6_make_pcpu_route() may trigger
1132 * ip6_dst_gc() which will take the write_lock.
1133 */
1134 dst_hold(&rt->dst);
1135 read_unlock_bh(&table->tb6_lock);
a73e4195 1136 pcpu_rt = rt6_make_pcpu_route(rt);
9c7370a1
MKL		 1137 dst_release(&rt->dst);
1138 }
d52d3997
MKL		 1139
1140 return pcpu_rt;
9c7370a1 1141
d52d3997 1142 }
1da177e4
LT		 1143}
1144
8ed67789 1145static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
4c9483b2 1146 struct flowi6 *fl6, int flags)
4acad72d 1147{
4c9483b2 1148 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
4acad72d
PE		 1149}
1150
72331bc0
SL		 1151static struct dst_entry *ip6_route_input_lookup(struct net *net,
1152 struct net_device *dev,
1153 struct flowi6 *fl6, int flags)
1154{
1155 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1156 flags |= RT6_LOOKUP_F_IFACE;
1157
1158 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1159}
1160
c71099ac
TG		 1161void ip6_route_input(struct sk_buff *skb)
1162{
b71d1d42 1163 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 1164 struct net *net = dev_net(skb->dev);
adaa70bb 1165 int flags = RT6_LOOKUP_F_HAS_SADDR;
904af04d 1166 struct ip_tunnel_info *tun_info;
4c9483b2
DM		 1167 struct flowi6 fl6 = {
1168 .flowi6_iif = skb->dev->ifindex,
1169 .daddr = iph->daddr,
1170 .saddr = iph->saddr,
6502ca52 1171 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 1172 .flowi6_mark = skb->mark,
1173 .flowi6_proto = iph->nexthdr,
c71099ac 1174 };
adaa70bb 1175
904af04d 1176 tun_info = skb_tunnel_info(skb);
46fa062a 1177 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 1178 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
06e9d040 1179 skb_dst_drop(skb);
72331bc0 1180 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
c71099ac
TG		 1181}
1182
8ed67789 1183static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
4c9483b2 1184 struct flowi6 *fl6, int flags)
1da177e4 1185{
4c9483b2 1186 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
c71099ac
TG		 1187}
1188
67ba4152 1189struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
4c9483b2 1190 struct flowi6 *fl6)
c71099ac
TG		 1191{
1192 int flags = 0;
1193
1fb9489b 1194 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 1195
4c9483b2 1196 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
77d16f45 1197 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 1198
4c9483b2 1199 if (!ipv6_addr_any(&fl6->saddr))
adaa70bb 1200 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 1201 else if (sk)
1202 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 1203
4c9483b2 1204 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1da177e4 1205}
7159039a 1206EXPORT_SYMBOL(ip6_route_output);
1da177e4 1207
2774c131 1208struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 1209{
5c1e6aa3 1210 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
14e50e57
DM		 1211 struct dst_entry *new = NULL;
1212
f5b0a874 1213 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
14e50e57 1214 if (rt) {
d8d1f30b 1215 new = &rt->dst;
14e50e57 1216
8104891b 1217 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
8104891b 1218
14e50e57 1219 new->__use = 1;
352e512c 1220 new->input = dst_discard;
aad88724 1221 new->output = dst_discard_sk;
14e50e57 1222
21efcfa0
ED		 1223 if (dst_metrics_read_only(&ort->dst))
1224 new->_metrics = ort->dst._metrics;
1225 else
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;
1716a961 1232 rt->rt6i_flags = ort->rt6i_flags;
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);
1325 if (ip6_del_rt(rt))
1326 dst_free(&rt->dst);
1327 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1da177e4 1328 rt->rt6i_node->fn_sernum = -1;
1eb4f758 1329 }
1da177e4
LT		 1330 }
1331}
1332
45e4fd26
MKL		 1333static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1334{
1335 struct net *net = dev_net(rt->dst.dev);
1336
1337 rt->rt6i_flags |= RTF_MODIFIED;
1338 rt->rt6i_pmtu = mtu;
1339 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1340}
1341
1342static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1343 const struct ipv6hdr *iph, u32 mtu)
1da177e4 1344{
67ba4152 1345 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 1346
45e4fd26
MKL		 1347 if (rt6->rt6i_flags & RTF_LOCAL)
1348 return;
81aded24 1349
45e4fd26
MKL		 1350 dst_confirm(dst);
1351 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1352 if (mtu >= dst_mtu(dst))
1353 return;
9d289715 1354
45e4fd26
MKL		 1355 if (rt6->rt6i_flags & RTF_CACHE) {
1356 rt6_do_update_pmtu(rt6, mtu);
1357 } else {
1358 const struct in6_addr *daddr, *saddr;
1359 struct rt6_info *nrt6;
1360
1361 if (iph) {
1362 daddr = &iph->daddr;
1363 saddr = &iph->saddr;
1364 } else if (sk) {
1365 daddr = &sk->sk_v6_daddr;
1366 saddr = &inet6_sk(sk)->saddr;
1367 } else {
1368 return;
1369 }
1370 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1371 if (nrt6) {
1372 rt6_do_update_pmtu(nrt6, mtu);
1373
1374 /* ip6_ins_rt(nrt6) will bump the
1375 * rt6->rt6i_node->fn_sernum
1376 * which will fail the next rt6_check() and
1377 * invalidate the sk->sk_dst_cache.
1378 */
1379 ip6_ins_rt(nrt6);
1380 }
1da177e4
LT		 1381 }
1382}
1383
45e4fd26
MKL		 1384static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1385 struct sk_buff *skb, u32 mtu)
1386{
1387 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1388}
1389
42ae66c8
DM		 1390void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1391 int oif, u32 mark)
81aded24
DM		 1392{
1393 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1394 struct dst_entry *dst;
1395 struct flowi6 fl6;
1396
1397 memset(&fl6, 0, sizeof(fl6));
1398 fl6.flowi6_oif = oif;
1b3c61dc 1399 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
81aded24
DM		 1400 fl6.daddr = iph->daddr;
1401 fl6.saddr = iph->saddr;
6502ca52 1402 fl6.flowlabel = ip6_flowinfo(iph);
81aded24
DM		 1403
1404 dst = ip6_route_output(net, NULL, &fl6);
1405 if (!dst->error)
45e4fd26 1406 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
81aded24
DM		 1407 dst_release(dst);
1408}
1409EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1410
1411void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1412{
1413 ip6_update_pmtu(skb, sock_net(sk), mtu,
1414 sk->sk_bound_dev_if, sk->sk_mark);
1415}
1416EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1417
b55b76b2
DJ		 1418/* Handle redirects */
1419struct ip6rd_flowi {
1420 struct flowi6 fl6;
1421 struct in6_addr gateway;
1422};
1423
1424static struct rt6_info *__ip6_route_redirect(struct net *net,
1425 struct fib6_table *table,
1426 struct flowi6 *fl6,
1427 int flags)
1428{
1429 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1430 struct rt6_info *rt;
1431 struct fib6_node *fn;
1432
1433 /* Get the "current" route for this destination and
1434 * check if the redirect has come from approriate router.
1435 *
1436 * RFC 4861 specifies that redirects should only be
1437 * accepted if they come from the nexthop to the target.
1438 * Due to the way the routes are chosen, this notion
1439 * is a bit fuzzy and one might need to check all possible
1440 * routes.
1441 */
1442
1443 read_lock_bh(&table->tb6_lock);
1444 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1445restart:
1446 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1447 if (rt6_check_expired(rt))
1448 continue;
1449 if (rt->dst.error)
1450 break;
1451 if (!(rt->rt6i_flags & RTF_GATEWAY))
1452 continue;
1453 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1454 continue;
1455 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1456 continue;
1457 break;
1458 }
1459
1460 if (!rt)
1461 rt = net->ipv6.ip6_null_entry;
1462 else if (rt->dst.error) {
1463 rt = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 1464 goto out;
1465 }
1466
1467 if (rt == net->ipv6.ip6_null_entry) {
a3c00e46
MKL		 1468 fn = fib6_backtrack(fn, &fl6->saddr);
1469 if (fn)
1470 goto restart;
b55b76b2 1471 }
a3c00e46 1472
b0a1ba59 1473out:
b55b76b2
DJ		 1474 dst_hold(&rt->dst);
1475
1476 read_unlock_bh(&table->tb6_lock);
1477
1478 return rt;
1479};
1480
1481static struct dst_entry *ip6_route_redirect(struct net *net,
1482 const struct flowi6 *fl6,
1483 const struct in6_addr *gateway)
1484{
1485 int flags = RT6_LOOKUP_F_HAS_SADDR;
1486 struct ip6rd_flowi rdfl;
1487
1488 rdfl.fl6 = *fl6;
1489 rdfl.gateway = *gateway;
1490
1491 return fib6_rule_lookup(net, &rdfl.fl6,
1492 flags, __ip6_route_redirect);
1493}
1494
3a5ad2ee
DM		 1495void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1496{
1497 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1498 struct dst_entry *dst;
1499 struct flowi6 fl6;
1500
1501 memset(&fl6, 0, sizeof(fl6));
e374c618 1502 fl6.flowi6_iif = LOOPBACK_IFINDEX;
3a5ad2ee
DM		 1503 fl6.flowi6_oif = oif;
1504 fl6.flowi6_mark = mark;
3a5ad2ee
DM		 1505 fl6.daddr = iph->daddr;
1506 fl6.saddr = iph->saddr;
6502ca52 1507 fl6.flowlabel = ip6_flowinfo(iph);
3a5ad2ee 1508
b55b76b2
DJ		 1509 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1510 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 1511 dst_release(dst);
1512}
1513EXPORT_SYMBOL_GPL(ip6_redirect);
1514
c92a59ec
DJ		 1515void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1516 u32 mark)
1517{
1518 const struct ipv6hdr *iph = ipv6_hdr(skb);
1519 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1520 struct dst_entry *dst;
1521 struct flowi6 fl6;
1522
1523 memset(&fl6, 0, sizeof(fl6));
e374c618 1524 fl6.flowi6_iif = LOOPBACK_IFINDEX;
c92a59ec
DJ		 1525 fl6.flowi6_oif = oif;
1526 fl6.flowi6_mark = mark;
c92a59ec
DJ		 1527 fl6.daddr = msg->dest;
1528 fl6.saddr = iph->daddr;
1529
b55b76b2
DJ		 1530 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1531 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 1532 dst_release(dst);
1533}
1534
3a5ad2ee
DM		 1535void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1536{
1537 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1538}
1539EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1540
0dbaee3b 1541static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 1542{
0dbaee3b
DM		 1543 struct net_device *dev = dst->dev;
1544 unsigned int mtu = dst_mtu(dst);
1545 struct net *net = dev_net(dev);
1546
1da177e4
LT		 1547 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1548
5578689a
DL		 1549 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1550 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 1551
1552 /*
1ab1457c
YH		 1553 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1554 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1555 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 1556 * rely only on pmtu discovery"
1557 */
1558 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1559 mtu = IPV6_MAXPLEN;
1560 return mtu;
1561}
1562
ebb762f2 1563static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 1564{
4b32b5ad
MKL		 1565 const struct rt6_info *rt = (const struct rt6_info *)dst;
1566 unsigned int mtu = rt->rt6i_pmtu;
d33e4553 1567 struct inet6_dev *idev;
618f9bc7 1568
4b32b5ad
MKL		 1569 if (mtu)
1570 goto out;
1571
1572 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 1573 if (mtu)
30f78d8e 1574 goto out;
618f9bc7
SK		 1575
1576 mtu = IPV6_MIN_MTU;
d33e4553
DM		 1577
1578 rcu_read_lock();
1579 idev = __in6_dev_get(dst->dev);
1580 if (idev)
1581 mtu = idev->cnf.mtu6;
1582 rcu_read_unlock();
1583
30f78d8e
ED		 1584out:
1585 return min_t(unsigned int, mtu, IP6_MAX_MTU);
d33e4553
DM		 1586}
1587
3b00944c
YH		 1588static struct dst_entry *icmp6_dst_gc_list;
1589static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1590
3b00944c 1591struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1592 struct flowi6 *fl6)
1da177e4 1593{
87a11578 1594 struct dst_entry *dst;
1da177e4
LT		 1595 struct rt6_info *rt;
1596 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1597 struct net *net = dev_net(dev);
1da177e4 1598
38308473 1599 if (unlikely(!idev))
122bdf67 1600 return ERR_PTR(-ENODEV);
1da177e4 1601
ad706862 1602 rt = ip6_dst_alloc(net, dev, 0);
38308473 1603 if (unlikely(!rt)) {
1da177e4 1604 in6_dev_put(idev);
87a11578 1605 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1606 goto out;
1607 }
1608
8e2ec639
YZ		 1609 rt->dst.flags |= DST_HOST;
1610 rt->dst.output = ip6_output;
d8d1f30b 1611 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1612 rt->rt6i_gateway = fl6->daddr;
87a11578 1613 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1614 rt->rt6i_dst.plen = 128;
1615 rt->rt6i_idev = idev;
14edd87d 1616 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1617
3b00944c 1618 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1619 rt->dst.next = icmp6_dst_gc_list;
1620 icmp6_dst_gc_list = &rt->dst;
3b00944c 1621 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1622
5578689a 1623 fib6_force_start_gc(net);
1da177e4 1624
87a11578
DM		 1625 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1626
1da177e4 1627out:
87a11578 1628 return dst;
1da177e4
LT		 1629}
1630
3d0f24a7 1631int icmp6_dst_gc(void)
1da177e4 1632{
e9476e95 1633 struct dst_entry *dst, **pprev;
3d0f24a7 1634 int more = 0;
1da177e4 1635
3b00944c
YH		 1636 spin_lock_bh(&icmp6_dst_lock);
1637 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1638
1da177e4
LT		 1639 while ((dst = *pprev) != NULL) {
1640 if (!atomic_read(&dst->__refcnt)) {
1641 *pprev = dst->next;
1642 dst_free(dst);
1da177e4
LT		 1643 } else {
1644 pprev = &dst->next;
3d0f24a7 1645 ++more;
1da177e4
LT		 1646 }
1647 }
1648
3b00944c 1649 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1650
3d0f24a7 1651 return more;
1da177e4
LT		 1652}
1653
1e493d19
DM		 1654static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1655 void *arg)
1656{
1657 struct dst_entry *dst, **pprev;
1658
1659 spin_lock_bh(&icmp6_dst_lock);
1660 pprev = &icmp6_dst_gc_list;
1661 while ((dst = *pprev) != NULL) {
1662 struct rt6_info *rt = (struct rt6_info *) dst;
1663 if (func(rt, arg)) {
1664 *pprev = dst->next;
1665 dst_free(dst);
1666 } else {
1667 pprev = &dst->next;
1668 }
1669 }
1670 spin_unlock_bh(&icmp6_dst_lock);
1671}
1672
569d3645 1673static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1674{
86393e52 1675 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1676 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1677 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1678 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1679 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1680 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1681 int entries;
7019b78e 1682
fc66f95c 1683 entries = dst_entries_get_fast(ops);
49a18d86 1684 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1685 entries <= rt_max_size)
1da177e4
LT		 1686 goto out;
1687
6891a346 1688 net->ipv6.ip6_rt_gc_expire++;
14956643 1689 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 1690 entries = dst_entries_get_slow(ops);
1691 if (entries < ops->gc_thresh)
7019b78e 1692 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1693out:
7019b78e 1694 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1695 return entries > rt_max_size;
1da177e4
LT		 1696}
1697
e715b6d3
FW		 1698static int ip6_convert_metrics(struct mx6_config *mxc,
1699 const struct fib6_config *cfg)
1700{
c3a8d947 1701 bool ecn_ca = false;
e715b6d3
FW		 1702 struct nlattr *nla;
1703 int remaining;
1704 u32 *mp;
1705
63159f29 1706 if (!cfg->fc_mx)
e715b6d3
FW		 1707 return 0;
1708
1709 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1710 if (unlikely(!mp))
1711 return -ENOMEM;
1712
1713 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1714 int type = nla_type(nla);
1bb14807 1715 u32 val;
e715b6d3 1716
1bb14807
DB		 1717 if (!type)
1718 continue;
1719 if (unlikely(type > RTAX_MAX))
1720 goto err;
ea697639 1721
1bb14807
DB		 1722 if (type == RTAX_CC_ALGO) {
1723 char tmp[TCP_CA_NAME_MAX];
e715b6d3 1724
1bb14807 1725 nla_strlcpy(tmp, nla, sizeof(tmp));
c3a8d947 1726 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1bb14807
DB		 1727 if (val == TCP_CA_UNSPEC)
1728 goto err;
1729 } else {
1730 val = nla_get_u32(nla);
e715b6d3 1731 }
b8d3e416
DB		 1732 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1733 goto err;
1bb14807
DB		 1734
1735 mp[type - 1] = val;
1736 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1737 }
1738
c3a8d947
DB		 1739 if (ecn_ca) {
1740 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1741 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1742 }
e715b6d3 1743
c3a8d947 1744 mxc->mx = mp;
e715b6d3
FW		 1745 return 0;
1746 err:
1747 kfree(mp);
1748 return -EINVAL;
1749}
1da177e4 1750
6b9ea5a6 1751int ip6_route_info_create(struct fib6_config *cfg, struct rt6_info **rt_ret)
1da177e4
LT		 1752{
1753 int err;
5578689a 1754 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1755 struct rt6_info *rt = NULL;
1756 struct net_device *dev = NULL;
1757 struct inet6_dev *idev = NULL;
c71099ac 1758 struct fib6_table *table;
1da177e4
LT		 1759 int addr_type;
1760
86872cb5 1761 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1da177e4
LT		 1762 return -EINVAL;
1763#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1764 if (cfg->fc_src_len)
1da177e4
LT		 1765 return -EINVAL;
1766#endif
86872cb5 1767 if (cfg->fc_ifindex) {
1da177e4 1768 err = -ENODEV;
5578689a 1769 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1770 if (!dev)
1771 goto out;
1772 idev = in6_dev_get(dev);
1773 if (!idev)
1774 goto out;
1775 }
1776
86872cb5
TG		 1777 if (cfg->fc_metric == 0)
1778 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1779
d71314b4 1780 err = -ENOBUFS;
38308473
DM		 1781 if (cfg->fc_nlinfo.nlh &&
1782 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1783 table = fib6_get_table(net, cfg->fc_table);
38308473 1784 if (!table) {
f3213831 1785 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1786 table = fib6_new_table(net, cfg->fc_table);
1787 }
1788 } else {
1789 table = fib6_new_table(net, cfg->fc_table);
1790 }
38308473
DM		 1791
1792 if (!table)
c71099ac 1793 goto out;
c71099ac 1794
ad706862
MKL		 1795 rt = ip6_dst_alloc(net, NULL,
1796 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1797
38308473 1798 if (!rt) {
1da177e4
LT		 1799 err = -ENOMEM;
1800 goto out;
1801 }
1802
1716a961
G		 1803 if (cfg->fc_flags & RTF_EXPIRES)
1804 rt6_set_expires(rt, jiffies +
1805 clock_t_to_jiffies(cfg->fc_expires));
1806 else
1807 rt6_clean_expires(rt);
1da177e4 1808
86872cb5
TG		 1809 if (cfg->fc_protocol == RTPROT_UNSPEC)
1810 cfg->fc_protocol = RTPROT_BOOT;
1811 rt->rt6i_protocol = cfg->fc_protocol;
1812
1813 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1814
1815 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1816 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1817 else if (cfg->fc_flags & RTF_LOCAL)
1818 rt->dst.input = ip6_input;
1da177e4 1819 else
d8d1f30b 1820 rt->dst.input = ip6_forward;
1da177e4 1821
d8d1f30b 1822 rt->dst.output = ip6_output;
1da177e4 1823
19e42e45
RP		 1824 if (cfg->fc_encap) {
1825 struct lwtunnel_state *lwtstate;
1826
1827 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
127eb7cd
TH		 1828 cfg->fc_encap, AF_INET6, cfg,
1829 &lwtstate);
19e42e45
RP		 1830 if (err)
1831 goto out;
61adedf3
JB		 1832 rt->dst.lwtstate = lwtstate_get(lwtstate);
1833 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1834 rt->dst.lwtstate->orig_output = rt->dst.output;
1835 rt->dst.output = lwtunnel_output;
25368623 1836 }
61adedf3
JB		 1837 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1838 rt->dst.lwtstate->orig_input = rt->dst.input;
1839 rt->dst.input = lwtunnel_input;
25368623 1840 }
19e42e45
RP		 1841 }
1842
86872cb5
TG		 1843 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1844 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1845 if (rt->rt6i_dst.plen == 128)
e5fd387a 1846 rt->dst.flags |= DST_HOST;
e5fd387a 1847
1da177e4 1848#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1849 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1850 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1851#endif
1852
86872cb5 1853 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1854
1855 /* We cannot add true routes via loopback here,
1856 they would result in kernel looping; promote them to reject routes
1857 */
86872cb5 1858 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1859 (dev && (dev->flags & IFF_LOOPBACK) &&
1860 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1861 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1862 /* hold loopback dev/idev if we haven't done so. */
5578689a 1863 if (dev != net->loopback_dev) {
1da177e4
LT		 1864 if (dev) {
1865 dev_put(dev);
1866 in6_dev_put(idev);
1867 }
5578689a 1868 dev = net->loopback_dev;
1da177e4
LT		 1869 dev_hold(dev);
1870 idev = in6_dev_get(dev);
1871 if (!idev) {
1872 err = -ENODEV;
1873 goto out;
1874 }
1875 }
1da177e4 1876 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1877 switch (cfg->fc_type) {
1878 case RTN_BLACKHOLE:
1879 rt->dst.error = -EINVAL;
aad88724 1880 rt->dst.output = dst_discard_sk;
7150aede 1881 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1882 break;
1883 case RTN_PROHIBIT:
1884 rt->dst.error = -EACCES;
7150aede
K		 1885 rt->dst.output = ip6_pkt_prohibit_out;
1886 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1887 break;
b4949ab2 1888 case RTN_THROW:
ef2c7d7b 1889 default:
7150aede
K		 1890 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1891 : -ENETUNREACH;
1892 rt->dst.output = ip6_pkt_discard_out;
1893 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1894 break;
1895 }
1da177e4
LT		 1896 goto install_route;
1897 }
1898
86872cb5 1899 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1900 const struct in6_addr *gw_addr;
1da177e4
LT		 1901 int gwa_type;
1902
86872cb5 1903 gw_addr = &cfg->fc_gateway;
330567b7 1904 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1905
1906 /* if gw_addr is local we will fail to detect this in case
1907 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1908 * will return already-added prefix route via interface that
1909 * prefix route was assigned to, which might be non-loopback.
1910 */
1911 err = -EINVAL;
330567b7
FW		 1912 if (ipv6_chk_addr_and_flags(net, gw_addr,
1913 gwa_type & IPV6_ADDR_LINKLOCAL ?
1914 dev : NULL, 0, 0))
48ed7b26
FW		 1915 goto out;
1916
4e3fd7a0 1917 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1918
1919 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1920 struct rt6_info *grt;
1921
1922 /* IPv6 strictly inhibits using not link-local
1923 addresses as nexthop address.
1924 Otherwise, router will not able to send redirects.
1925 It is very good, but in some (rare!) circumstances
1926 (SIT, PtP, NBMA NOARP links) it is handy to allow
1927 some exceptions. --ANK
1928 */
38308473 1929 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1930 goto out;
1931
5578689a 1932 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1da177e4
LT		 1933
1934 err = -EHOSTUNREACH;
38308473 1935 if (!grt)
1da177e4
LT		 1936 goto out;
1937 if (dev) {
d1918542 1938 if (dev != grt->dst.dev) {
94e187c0 1939 ip6_rt_put(grt);
1da177e4
LT		 1940 goto out;
1941 }
1942 } else {
d1918542 1943 dev = grt->dst.dev;
1da177e4
LT		 1944 idev = grt->rt6i_idev;
1945 dev_hold(dev);
1946 in6_dev_hold(grt->rt6i_idev);
1947 }
38308473 1948 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 1949 err = 0;
94e187c0 1950 ip6_rt_put(grt);
1da177e4
LT		 1951
1952 if (err)
1953 goto out;
1954 }
1955 err = -EINVAL;
38308473 1956 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 1957 goto out;
1958 }
1959
1960 err = -ENODEV;
38308473 1961 if (!dev)
1da177e4
LT		 1962 goto out;
1963
c3968a85
DW		 1964 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1965 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1966 err = -EINVAL;
1967 goto out;
1968 }
4e3fd7a0 1969 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 1970 rt->rt6i_prefsrc.plen = 128;
1971 } else
1972 rt->rt6i_prefsrc.plen = 0;
1973
86872cb5 1974 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 1975
1976install_route:
d8d1f30b 1977 rt->dst.dev = dev;
1da177e4 1978 rt->rt6i_idev = idev;
c71099ac 1979 rt->rt6i_table = table;
63152fc0 1980
c346dca1 1981 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 1982
6b9ea5a6
RP		 1983 *rt_ret = rt;
1984
1985 return 0;
1986out:
1987 if (dev)
1988 dev_put(dev);
1989 if (idev)
1990 in6_dev_put(idev);
1991 if (rt)
1992 dst_free(&rt->dst);
1993
1994 *rt_ret = NULL;
1995
1996 return err;
1997}
1998
1999int ip6_route_add(struct fib6_config *cfg)
2000{
2001 struct mx6_config mxc = { .mx = NULL, };
2002 struct rt6_info *rt = NULL;
2003 int err;
2004
2005 err = ip6_route_info_create(cfg, &rt);
2006 if (err)
2007 goto out;
2008
e715b6d3
FW		 2009 err = ip6_convert_metrics(&mxc, cfg);
2010 if (err)
2011 goto out;
1da177e4 2012
e715b6d3
FW		 2013 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2014
2015 kfree(mxc.mx);
6b9ea5a6 2016
e715b6d3 2017 return err;
1da177e4 2018out:
1da177e4 2019 if (rt)
d8d1f30b 2020 dst_free(&rt->dst);
6b9ea5a6 2021
1da177e4
LT		 2022 return err;
2023}
2024
86872cb5 2025static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2026{
2027 int err;
c71099ac 2028 struct fib6_table *table;
d1918542 2029 struct net *net = dev_net(rt->dst.dev);
1da177e4 2030
6825a26c
G		 2031 if (rt == net->ipv6.ip6_null_entry) {
2032 err = -ENOENT;
2033 goto out;
2034 }
6c813a72 2035
c71099ac
TG		 2036 table = rt->rt6i_table;
2037 write_lock_bh(&table->tb6_lock);
86872cb5 2038 err = fib6_del(rt, info);
c71099ac 2039 write_unlock_bh(&table->tb6_lock);
1da177e4 2040
6825a26c 2041out:
94e187c0 2042 ip6_rt_put(rt);
1da177e4
LT		 2043 return err;
2044}
2045
e0a1ad73
TG		 2046int ip6_del_rt(struct rt6_info *rt)
2047{
4d1169c1 2048 struct nl_info info = {
d1918542 2049 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2050 };
528c4ceb 2051 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2052}
2053
86872cb5 2054static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2055{
c71099ac 2056 struct fib6_table *table;
1da177e4
LT		 2057 struct fib6_node *fn;
2058 struct rt6_info *rt;
2059 int err = -ESRCH;
2060
5578689a 2061 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2062 if (!table)
c71099ac
TG		 2063 return err;
2064
2065 read_lock_bh(&table->tb6_lock);
1da177e4 2066
c71099ac 2067 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2068 &cfg->fc_dst, cfg->fc_dst_len,
2069 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2070
1da177e4 2071 if (fn) {
d8d1f30b 2072 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2073 if ((rt->rt6i_flags & RTF_CACHE) &&
2074 !(cfg->fc_flags & RTF_CACHE))
2075 continue;
86872cb5 2076 if (cfg->fc_ifindex &&
d1918542
DM		 2077 (!rt->dst.dev ||
2078 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2079 continue;
86872cb5
TG		 2080 if (cfg->fc_flags & RTF_GATEWAY &&
2081 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2082 continue;
86872cb5 2083 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2084 continue;
d8d1f30b 2085 dst_hold(&rt->dst);
c71099ac 2086 read_unlock_bh(&table->tb6_lock);
1da177e4 2087
86872cb5 2088 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2089 }
2090 }
c71099ac 2091 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2092
2093 return err;
2094}
2095
6700c270 2096static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2097{
e8599ff4 2098 struct net *net = dev_net(skb->dev);
a6279458 2099 struct netevent_redirect netevent;
e8599ff4 2100 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2101 struct ndisc_options ndopts;
2102 struct inet6_dev *in6_dev;
2103 struct neighbour *neigh;
71bcdba0 2104 struct rd_msg *msg;
6e157b6a
DM		 2105 int optlen, on_link;
2106 u8 *lladdr;
e8599ff4 2107
29a3cad5 2108 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2109 optlen -= sizeof(*msg);
e8599ff4
DM		 2110
2111 if (optlen < 0) {
6e157b6a 2112 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2113 return;
2114 }
2115
71bcdba0 2116 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2117
71bcdba0 2118 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2119 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2120 return;
2121 }
2122
6e157b6a 2123 on_link = 0;
71bcdba0 2124 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2125 on_link = 1;
71bcdba0 2126 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2127 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2128 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2129 return;
2130 }
2131
2132 in6_dev = __in6_dev_get(skb->dev);
2133 if (!in6_dev)
2134 return;
2135 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2136 return;
2137
2138 /* RFC2461 8.1:
2139 * The IP source address of the Redirect MUST be the same as the current
2140 * first-hop router for the specified ICMP Destination Address.
2141 */
2142
71bcdba0 2143 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2144 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2145 return;
2146 }
6e157b6a
DM		 2147
2148 lladdr = NULL;
e8599ff4
DM		 2149 if (ndopts.nd_opts_tgt_lladdr) {
2150 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2151 skb->dev);
2152 if (!lladdr) {
2153 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2154 return;
2155 }
2156 }
2157
6e157b6a
DM		 2158 rt = (struct rt6_info *) dst;
2159 if (rt == net->ipv6.ip6_null_entry) {
2160 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2161 return;
6e157b6a 2162 }
e8599ff4 2163
6e157b6a
DM		 2164 /* Redirect received -> path was valid.
2165 * Look, redirects are sent only in response to data packets,
2166 * so that this nexthop apparently is reachable. --ANK
2167 */
2168 dst_confirm(&rt->dst);
a6279458 2169
71bcdba0 2170 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2171 if (!neigh)
2172 return;
a6279458 2173
1da177e4
LT		 2174 /*
2175 * We have finally decided to accept it.
2176 */
2177
1ab1457c 2178 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 2179 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2180 NEIGH_UPDATE_F_OVERRIDE|
2181 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2182 NEIGH_UPDATE_F_ISROUTER))
2183 );
2184
83a09abd 2185 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2186 if (!nrt)
1da177e4
LT		 2187 goto out;
2188
2189 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2190 if (on_link)
2191 nrt->rt6i_flags &= ~RTF_GATEWAY;
2192
4e3fd7a0 2193 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2194
40e22e8f 2195 if (ip6_ins_rt(nrt))
1da177e4
LT		 2196 goto out;
2197
d8d1f30b
CG		 2198 netevent.old = &rt->dst;
2199 netevent.new = &nrt->dst;
71bcdba0 2200 netevent.daddr = &msg->dest;
60592833 2201 netevent.neigh = neigh;
8d71740c
TT		 2202 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2203
38308473 2204 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2205 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2206 ip6_del_rt(rt);
1da177e4
LT		 2207 }
2208
2209out:
e8599ff4 2210 neigh_release(neigh);
6e157b6a
DM		 2211}
2212
1da177e4
LT		 2213/*
2214 * Misc support functions
2215 */
2216
4b32b5ad
MKL		 2217static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2218{
2219 BUG_ON(from->dst.from);
2220
2221 rt->rt6i_flags &= ~RTF_EXPIRES;
2222 dst_hold(&from->dst);
2223 rt->dst.from = &from->dst;
2224 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2225}
2226
83a09abd
MKL		 2227static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2228{
2229 rt->dst.input = ort->dst.input;
2230 rt->dst.output = ort->dst.output;
2231 rt->rt6i_dst = ort->rt6i_dst;
2232 rt->dst.error = ort->dst.error;
2233 rt->rt6i_idev = ort->rt6i_idev;
2234 if (rt->rt6i_idev)
2235 in6_dev_hold(rt->rt6i_idev);
2236 rt->dst.lastuse = jiffies;
2237 rt->rt6i_gateway = ort->rt6i_gateway;
2238 rt->rt6i_flags = ort->rt6i_flags;
2239 rt6_set_from(rt, ort);
2240 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2241#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2242 rt->rt6i_src = ort->rt6i_src;
1da177e4 2243#endif
83a09abd
MKL		 2244 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2245 rt->rt6i_table = ort->rt6i_table;
61adedf3 2246 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2247}
2248
70ceb4f5 2249#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2250static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 2251 const struct in6_addr *prefix, int prefixlen,
2252 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 2253{
2254 struct fib6_node *fn;
2255 struct rt6_info *rt = NULL;
c71099ac
TG		 2256 struct fib6_table *table;
2257
efa2cea0 2258 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 2259 if (!table)
c71099ac 2260 return NULL;
70ceb4f5 2261
5744dd9b 2262 read_lock_bh(&table->tb6_lock);
67ba4152 2263 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2264 if (!fn)
2265 goto out;
2266
d8d1f30b 2267 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2268 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2269 continue;
2270 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2271 continue;
2272 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2273 continue;
d8d1f30b 2274 dst_hold(&rt->dst);
70ceb4f5
YH		 2275 break;
2276 }
2277out:
5744dd9b 2278 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2279 return rt;
2280}
2281
efa2cea0 2282static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 2283 const struct in6_addr *prefix, int prefixlen,
2284 const struct in6_addr *gwaddr, int ifindex,
95c96174 2285 unsigned int pref)
70ceb4f5 2286{
86872cb5
TG		 2287 struct fib6_config cfg = {
2288 .fc_table = RT6_TABLE_INFO,
238fc7ea 2289 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2290 .fc_ifindex = ifindex,
2291 .fc_dst_len = prefixlen,
2292 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2293 RTF_UP | RTF_PREF(pref),
15e47304 2294 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2295 .fc_nlinfo.nlh = NULL,
2296 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2297 };
2298
4e3fd7a0
AD		 2299 cfg.fc_dst = *prefix;
2300 cfg.fc_gateway = *gwaddr;
70ceb4f5 2301
e317da96
YH		 2302 /* We should treat it as a default route if prefix length is 0. */
2303 if (!prefixlen)
86872cb5 2304 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2305
86872cb5 2306 ip6_route_add(&cfg);
70ceb4f5 2307
efa2cea0 2308 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 2309}
2310#endif
2311
b71d1d42 2312struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2313{
1da177e4 2314 struct rt6_info *rt;
c71099ac 2315 struct fib6_table *table;
1da177e4 2316
c346dca1 2317 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 2318 if (!table)
c71099ac 2319 return NULL;
1da177e4 2320
5744dd9b 2321 read_lock_bh(&table->tb6_lock);
67ba4152 2322 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2323 if (dev == rt->dst.dev &&
045927ff 2324 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2325 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2326 break;
2327 }
2328 if (rt)
d8d1f30b 2329 dst_hold(&rt->dst);
5744dd9b 2330 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2331 return rt;
2332}
2333
b71d1d42 2334struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2335 struct net_device *dev,
2336 unsigned int pref)
1da177e4 2337{
86872cb5
TG		 2338 struct fib6_config cfg = {
2339 .fc_table = RT6_TABLE_DFLT,
238fc7ea 2340 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2341 .fc_ifindex = dev->ifindex,
2342 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2343 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2344 .fc_nlinfo.portid = 0,
5578689a 2345 .fc_nlinfo.nlh = NULL,
c346dca1 2346 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2347 };
1da177e4 2348
4e3fd7a0 2349 cfg.fc_gateway = *gwaddr;
1da177e4 2350
86872cb5 2351 ip6_route_add(&cfg);
1da177e4 2352
1da177e4
LT		 2353 return rt6_get_dflt_router(gwaddr, dev);
2354}
2355
7b4da532 2356void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2357{
2358 struct rt6_info *rt;
c71099ac
TG		 2359 struct fib6_table *table;
2360
2361 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2362 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2363 if (!table)
c71099ac 2364 return;
1da177e4
LT		 2365
2366restart:
c71099ac 2367 read_lock_bh(&table->tb6_lock);
d8d1f30b 2368 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2369 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2370 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2371 dst_hold(&rt->dst);
c71099ac 2372 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2373 ip6_del_rt(rt);
1da177e4
LT		 2374 goto restart;
2375 }
2376 }
c71099ac 2377 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2378}
2379
5578689a
DL		 2380static void rtmsg_to_fib6_config(struct net *net,
2381 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2382 struct fib6_config *cfg)
2383{
2384 memset(cfg, 0, sizeof(*cfg));
2385
2386 cfg->fc_table = RT6_TABLE_MAIN;
2387 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2388 cfg->fc_metric = rtmsg->rtmsg_metric;
2389 cfg->fc_expires = rtmsg->rtmsg_info;
2390 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2391 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2392 cfg->fc_flags = rtmsg->rtmsg_flags;
2393
5578689a 2394 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2395
4e3fd7a0
AD		 2396 cfg->fc_dst = rtmsg->rtmsg_dst;
2397 cfg->fc_src = rtmsg->rtmsg_src;
2398 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2399}
2400
5578689a 2401int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2402{
86872cb5 2403 struct fib6_config cfg;
1da177e4
LT		 2404 struct in6_rtmsg rtmsg;
2405 int err;
2406
67ba4152 2407 switch (cmd) {
1da177e4
LT		 2408 case SIOCADDRT: /* Add a route */
2409 case SIOCDELRT: /* Delete a route */
af31f412 2410 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2411 return -EPERM;
2412 err = copy_from_user(&rtmsg, arg,
2413 sizeof(struct in6_rtmsg));
2414 if (err)
2415 return -EFAULT;
86872cb5 2416
5578689a 2417 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2418
1da177e4
LT		 2419 rtnl_lock();
2420 switch (cmd) {
2421 case SIOCADDRT:
86872cb5 2422 err = ip6_route_add(&cfg);
1da177e4
LT		 2423 break;
2424 case SIOCDELRT:
86872cb5 2425 err = ip6_route_del(&cfg);
1da177e4
LT		 2426 break;
2427 default:
2428 err = -EINVAL;
2429 }
2430 rtnl_unlock();
2431
2432 return err;
3ff50b79 2433 }
1da177e4
LT		 2434
2435 return -EINVAL;
2436}
2437
2438/*
2439 * Drop the packet on the floor
2440 */
2441
d5fdd6ba 2442static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2443{
612f09e8 2444 int type;
adf30907 2445 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2446 switch (ipstats_mib_noroutes) {
2447 case IPSTATS_MIB_INNOROUTES:
0660e03f 2448 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2449 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2450 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2451 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2452 break;
2453 }
2454 /* FALLTHROUGH */
2455 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2456 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2457 ipstats_mib_noroutes);
612f09e8
YH		 2458 break;
2459 }
3ffe533c 2460 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2461 kfree_skb(skb);
2462 return 0;
2463}
2464
9ce8ade0
TG		 2465static int ip6_pkt_discard(struct sk_buff *skb)
2466{
612f09e8 2467 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2468}
2469
aad88724 2470static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
1da177e4 2471{
adf30907 2472 skb->dev = skb_dst(skb)->dev;
612f09e8 2473 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2474}
2475
9ce8ade0
TG		 2476static int ip6_pkt_prohibit(struct sk_buff *skb)
2477{
612f09e8 2478 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2479}
2480
aad88724 2481static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
9ce8ade0 2482{
adf30907 2483 skb->dev = skb_dst(skb)->dev;
612f09e8 2484 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2485}
2486
1da177e4
LT		 2487/*
2488 * Allocate a dst for local (unicast / anycast) address.
2489 */
2490
2491struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2492 const struct in6_addr *addr,
8f031519 2493 bool anycast)
1da177e4 2494{
c346dca1 2495 struct net *net = dev_net(idev->dev);
a3300ef4 2496 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
ad706862 2497 DST_NOCOUNT);
a3300ef4 2498 if (!rt)
1da177e4
LT		 2499 return ERR_PTR(-ENOMEM);
2500
1da177e4
LT		 2501 in6_dev_hold(idev);
2502
11d53b49 2503 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2504 rt->dst.input = ip6_input;
2505 rt->dst.output = ip6_output;
1da177e4 2506 rt->rt6i_idev = idev;
1da177e4
LT		 2507
2508 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2509 if (anycast)
2510 rt->rt6i_flags |= RTF_ANYCAST;
2511 else
1da177e4 2512 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2513
550bab42 2514 rt->rt6i_gateway = *addr;
4e3fd7a0 2515 rt->rt6i_dst.addr = *addr;
1da177e4 2516 rt->rt6i_dst.plen = 128;
5578689a 2517 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
1da177e4 2518
d8d1f30b 2519 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2520
2521 return rt;
2522}
2523
c3968a85
DW		 2524int ip6_route_get_saddr(struct net *net,
2525 struct rt6_info *rt,
b71d1d42 2526 const struct in6_addr *daddr,
c3968a85
DW		 2527 unsigned int prefs,
2528 struct in6_addr *saddr)
2529{
e16e888b
MS		 2530 struct inet6_dev *idev =
2531 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
c3968a85 2532 int err = 0;
e16e888b 2533 if (rt && rt->rt6i_prefsrc.plen)
4e3fd7a0 2534 *saddr = rt->rt6i_prefsrc.addr;
c3968a85
DW		 2535 else
2536 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2537 daddr, prefs, saddr);
2538 return err;
2539}
2540
2541/* remove deleted ip from prefsrc entries */
2542struct arg_dev_net_ip {
2543 struct net_device *dev;
2544 struct net *net;
2545 struct in6_addr *addr;
2546};
2547
2548static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2549{
2550 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2551 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2552 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2553
d1918542 2554 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2555 rt != net->ipv6.ip6_null_entry &&
2556 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2557 /* remove prefsrc entry */
2558 rt->rt6i_prefsrc.plen = 0;
2559 }
2560 return 0;
2561}
2562
2563void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2564{
2565 struct net *net = dev_net(ifp->idev->dev);
2566 struct arg_dev_net_ip adni = {
2567 .dev = ifp->idev->dev,
2568 .net = net,
2569 .addr = &ifp->addr,
2570 };
0c3584d5 2571 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2572}
2573
be7a010d
DJ		 2574#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2575#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2576
2577/* Remove routers and update dst entries when gateway turn into host. */
2578static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2579{
2580 struct in6_addr *gateway = (struct in6_addr *)arg;
2581
2582 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2583 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2584 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2585 return -1;
2586 }
2587 return 0;
2588}
2589
2590void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2591{
2592 fib6_clean_all(net, fib6_clean_tohost, gateway);
2593}
2594
8ed67789
DL		 2595struct arg_dev_net {
2596 struct net_device *dev;
2597 struct net *net;
2598};
2599
1da177e4
LT		 2600static int fib6_ifdown(struct rt6_info *rt, void *arg)
2601{
bc3ef660 2602 const struct arg_dev_net *adn = arg;
2603 const struct net_device *dev = adn->dev;
8ed67789 2604
d1918542 2605 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2606 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2607 return -1;
c159d30c 2608
1da177e4
LT		 2609 return 0;
2610}
2611
f3db4851 2612void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2613{
8ed67789
DL		 2614 struct arg_dev_net adn = {
2615 .dev = dev,
2616 .net = net,
2617 };
2618
0c3584d5 2619 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2620 icmp6_clean_all(fib6_ifdown, &adn);
8d0b94af 2621 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2622}
2623
95c96174 2624struct rt6_mtu_change_arg {
1da177e4 2625 struct net_device *dev;
95c96174 2626 unsigned int mtu;
1da177e4
LT		 2627};
2628
2629static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2630{
2631 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2632 struct inet6_dev *idev;
2633
2634 /* In IPv6 pmtu discovery is not optional,
2635 so that RTAX_MTU lock cannot disable it.
2636 We still use this lock to block changes
2637 caused by addrconf/ndisc.
2638 */
2639
2640 idev = __in6_dev_get(arg->dev);
38308473 2641 if (!idev)
1da177e4
LT		 2642 return 0;
2643
2644 /* For administrative MTU increase, there is no way to discover
2645 IPv6 PMTU increase, so PMTU increase should be updated here.
2646 Since RFC 1981 doesn't include administrative MTU increase
2647 update PMTU increase is a MUST. (i.e. jumbo frame)
2648 */
2649 /*
2650 If new MTU is less than route PMTU, this new MTU will be the
2651 lowest MTU in the path, update the route PMTU to reflect PMTU
2652 decreases; if new MTU is greater than route PMTU, and the
2653 old MTU is the lowest MTU in the path, update the route PMTU
2654 to reflect the increase. In this case if the other nodes' MTU
2655 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2656 PMTU discouvery.
2657 */
d1918542 2658 if (rt->dst.dev == arg->dev &&
4b32b5ad
MKL		 2659 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2660 if (rt->rt6i_flags & RTF_CACHE) {
2661 /* For RTF_CACHE with rt6i_pmtu == 0
2662 * (i.e. a redirected route),
2663 * the metrics of its rt->dst.from has already
2664 * been updated.
2665 */
2666 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2667 rt->rt6i_pmtu = arg->mtu;
2668 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2669 (dst_mtu(&rt->dst) < arg->mtu &&
2670 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2671 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2672 }
566cfd8f 2673 }
1da177e4
LT		 2674 return 0;
2675}
2676
95c96174 2677void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2678{
c71099ac
TG		 2679 struct rt6_mtu_change_arg arg = {
2680 .dev = dev,
2681 .mtu = mtu,
2682 };
1da177e4 2683
0c3584d5 2684 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2685}
2686
ef7c79ed 2687static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2688 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2689 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2690 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2691 [RTA_PRIORITY] = { .type = NLA_U32 },
2692 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2693 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2694 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2695 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2696 [RTA_ENCAP] = { .type = NLA_NESTED },
86872cb5
TG		 2697};
2698
2699static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2700 struct fib6_config *cfg)
1da177e4 2701{
86872cb5
TG		 2702 struct rtmsg *rtm;
2703 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2704 unsigned int pref;
86872cb5 2705 int err;
1da177e4 2706
86872cb5
TG		 2707 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2708 if (err < 0)
2709 goto errout;
1da177e4 2710
86872cb5
TG		 2711 err = -EINVAL;
2712 rtm = nlmsg_data(nlh);
2713 memset(cfg, 0, sizeof(*cfg));
2714
2715 cfg->fc_table = rtm->rtm_table;
2716 cfg->fc_dst_len = rtm->rtm_dst_len;
2717 cfg->fc_src_len = rtm->rtm_src_len;
2718 cfg->fc_flags = RTF_UP;
2719 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2720 cfg->fc_type = rtm->rtm_type;
86872cb5 2721
ef2c7d7b
ND		 2722 if (rtm->rtm_type == RTN_UNREACHABLE ||
2723 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2724 rtm->rtm_type == RTN_PROHIBIT ||
2725 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2726 cfg->fc_flags |= RTF_REJECT;
2727
ab79ad14
MŻ		 2728 if (rtm->rtm_type == RTN_LOCAL)
2729 cfg->fc_flags |= RTF_LOCAL;
2730
1f56a01f
MKL		 2731 if (rtm->rtm_flags & RTM_F_CLONED)
2732 cfg->fc_flags |= RTF_CACHE;
2733
15e47304 2734 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2735 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2736 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2737
2738 if (tb[RTA_GATEWAY]) {
67b61f6c 2739 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2740 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2741 }
86872cb5
TG		 2742
2743 if (tb[RTA_DST]) {
2744 int plen = (rtm->rtm_dst_len + 7) >> 3;
2745
2746 if (nla_len(tb[RTA_DST]) < plen)
2747 goto errout;
2748
2749 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2750 }
86872cb5
TG		 2751
2752 if (tb[RTA_SRC]) {
2753 int plen = (rtm->rtm_src_len + 7) >> 3;
2754
2755 if (nla_len(tb[RTA_SRC]) < plen)
2756 goto errout;
2757
2758 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2759 }
86872cb5 2760
c3968a85 2761 if (tb[RTA_PREFSRC])
67b61f6c 2762 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2763
86872cb5
TG		 2764 if (tb[RTA_OIF])
2765 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2766
2767 if (tb[RTA_PRIORITY])
2768 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2769
2770 if (tb[RTA_METRICS]) {
2771 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2772 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2773 }
86872cb5
TG		 2774
2775 if (tb[RTA_TABLE])
2776 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2777
51ebd318
ND		 2778 if (tb[RTA_MULTIPATH]) {
2779 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2780 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2781 }
2782
c78ba6d6
LR		 2783 if (tb[RTA_PREF]) {
2784 pref = nla_get_u8(tb[RTA_PREF]);
2785 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2786 pref != ICMPV6_ROUTER_PREF_HIGH)
2787 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2788 cfg->fc_flags |= RTF_PREF(pref);
2789 }
2790
19e42e45
RP		 2791 if (tb[RTA_ENCAP])
2792 cfg->fc_encap = tb[RTA_ENCAP];
2793
2794 if (tb[RTA_ENCAP_TYPE])
2795 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2796
86872cb5
TG		 2797 err = 0;
2798errout:
2799 return err;
1da177e4
LT		 2800}
2801
6b9ea5a6
RP		 2802struct rt6_nh {
2803 struct rt6_info *rt6_info;
2804 struct fib6_config r_cfg;
2805 struct mx6_config mxc;
2806 struct list_head next;
2807};
2808
2809static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2810{
2811 struct rt6_nh *nh;
2812
2813 list_for_each_entry(nh, rt6_nh_list, next) {
2814 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2815 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2816 nh->r_cfg.fc_ifindex);
2817 }
2818}
2819
2820static int ip6_route_info_append(struct list_head *rt6_nh_list,
2821 struct rt6_info *rt, struct fib6_config *r_cfg)
2822{
2823 struct rt6_nh *nh;
2824 struct rt6_info *rtnh;
2825 int err = -EEXIST;
2826
2827 list_for_each_entry(nh, rt6_nh_list, next) {
2828 /* check if rt6_info already exists */
2829 rtnh = nh->rt6_info;
2830
2831 if (rtnh->dst.dev == rt->dst.dev &&
2832 rtnh->rt6i_idev == rt->rt6i_idev &&
2833 ipv6_addr_equal(&rtnh->rt6i_gateway,
2834 &rt->rt6i_gateway))
2835 return err;
2836 }
2837
2838 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2839 if (!nh)
2840 return -ENOMEM;
2841 nh->rt6_info = rt;
2842 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2843 if (err) {
2844 kfree(nh);
2845 return err;
2846 }
2847 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2848 list_add_tail(&nh->next, rt6_nh_list);
2849
2850 return 0;
2851}
2852
2853static int ip6_route_multipath_add(struct fib6_config *cfg)
51ebd318
ND		 2854{
2855 struct fib6_config r_cfg;
2856 struct rtnexthop *rtnh;
6b9ea5a6
RP		 2857 struct rt6_info *rt;
2858 struct rt6_nh *err_nh;
2859 struct rt6_nh *nh, *nh_safe;
51ebd318
ND		 2860 int remaining;
2861 int attrlen;
6b9ea5a6
RP		 2862 int err = 1;
2863 int nhn = 0;
2864 int replace = (cfg->fc_nlinfo.nlh &&
2865 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2866 LIST_HEAD(rt6_nh_list);
51ebd318 2867
35f1b4e9 2868 remaining = cfg->fc_mp_len;
51ebd318 2869 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 2870
6b9ea5a6
RP		 2871 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2872 * rt6_info structs per nexthop
2873 */
51ebd318
ND		 2874 while (rtnh_ok(rtnh, remaining)) {
2875 memcpy(&r_cfg, cfg, sizeof(*cfg));
2876 if (rtnh->rtnh_ifindex)
2877 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2878
2879 attrlen = rtnh_attrlen(rtnh);
2880 if (attrlen > 0) {
2881 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2882
2883 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2884 if (nla) {
67b61f6c 2885 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 2886 r_cfg.fc_flags |= RTF_GATEWAY;
2887 }
19e42e45
RP		 2888 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2889 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2890 if (nla)
2891 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 2892 }
6b9ea5a6
RP		 2893
2894 err = ip6_route_info_create(&r_cfg, &rt);
2895 if (err)
2896 goto cleanup;
2897
2898 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
51ebd318 2899 if (err) {
6b9ea5a6
RP		 2900 dst_free(&rt->dst);
2901 goto cleanup;
2902 }
2903
2904 rtnh = rtnh_next(rtnh, &remaining);
2905 }
2906
2907 err_nh = NULL;
2908 list_for_each_entry(nh, &rt6_nh_list, next) {
2909 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2910 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2911 nh->rt6_info = NULL;
2912 if (err) {
2913 if (replace && nhn)
2914 ip6_print_replace_route_err(&rt6_nh_list);
2915 err_nh = nh;
2916 goto add_errout;
51ebd318 2917 }
6b9ea5a6 2918
1a72418b 2919 /* Because each route is added like a single route we remove
27596472
MK		 2920 * these flags after the first nexthop: if there is a collision,
2921 * we have already failed to add the first nexthop:
2922 * fib6_add_rt2node() has rejected it; when replacing, old
2923 * nexthops have been replaced by first new, the rest should
2924 * be added to it.
1a72418b 2925 */
27596472
MK		 2926 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2927 NLM_F_REPLACE);
6b9ea5a6
RP		 2928 nhn++;
2929 }
2930
2931 goto cleanup;
2932
2933add_errout:
2934 /* Delete routes that were already added */
2935 list_for_each_entry(nh, &rt6_nh_list, next) {
2936 if (err_nh == nh)
2937 break;
2938 ip6_route_del(&nh->r_cfg);
2939 }
2940
2941cleanup:
2942 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
2943 if (nh->rt6_info)
2944 dst_free(&nh->rt6_info->dst);
52fe51f8 2945 kfree(nh->mxc.mx);
6b9ea5a6
RP		 2946 list_del(&nh->next);
2947 kfree(nh);
2948 }
2949
2950 return err;
2951}
2952
2953static int ip6_route_multipath_del(struct fib6_config *cfg)
2954{
2955 struct fib6_config r_cfg;
2956 struct rtnexthop *rtnh;
2957 int remaining;
2958 int attrlen;
2959 int err = 1, last_err = 0;
2960
2961 remaining = cfg->fc_mp_len;
2962 rtnh = (struct rtnexthop *)cfg->fc_mp;
2963
2964 /* Parse a Multipath Entry */
2965 while (rtnh_ok(rtnh, remaining)) {
2966 memcpy(&r_cfg, cfg, sizeof(*cfg));
2967 if (rtnh->rtnh_ifindex)
2968 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2969
2970 attrlen = rtnh_attrlen(rtnh);
2971 if (attrlen > 0) {
2972 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2973
2974 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2975 if (nla) {
2976 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2977 r_cfg.fc_flags |= RTF_GATEWAY;
2978 }
2979 }
2980 err = ip6_route_del(&r_cfg);
2981 if (err)
2982 last_err = err;
2983
51ebd318
ND		 2984 rtnh = rtnh_next(rtnh, &remaining);
2985 }
2986
2987 return last_err;
2988}
2989
67ba4152 2990static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 2991{
86872cb5
TG		 2992 struct fib6_config cfg;
2993 int err;
1da177e4 2994
86872cb5
TG		 2995 err = rtm_to_fib6_config(skb, nlh, &cfg);
2996 if (err < 0)
2997 return err;
2998
51ebd318 2999 if (cfg.fc_mp)
6b9ea5a6 3000 return ip6_route_multipath_del(&cfg);
51ebd318
ND		 3001 else
3002 return ip6_route_del(&cfg);
1da177e4
LT		 3003}
3004
67ba4152 3005static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3006{
86872cb5
TG		 3007 struct fib6_config cfg;
3008 int err;
1da177e4 3009
86872cb5
TG		 3010 err = rtm_to_fib6_config(skb, nlh, &cfg);
3011 if (err < 0)
3012 return err;
3013
51ebd318 3014 if (cfg.fc_mp)
6b9ea5a6 3015 return ip6_route_multipath_add(&cfg);
51ebd318
ND		 3016 else
3017 return ip6_route_add(&cfg);
1da177e4
LT		 3018}
3019
19e42e45 3020static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 3021{
3022 return NLMSG_ALIGN(sizeof(struct rtmsg))
3023 + nla_total_size(16) /* RTA_SRC */
3024 + nla_total_size(16) /* RTA_DST */
3025 + nla_total_size(16) /* RTA_GATEWAY */
3026 + nla_total_size(16) /* RTA_PREFSRC */
3027 + nla_total_size(4) /* RTA_TABLE */
3028 + nla_total_size(4) /* RTA_IIF */
3029 + nla_total_size(4) /* RTA_OIF */
3030 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 3031 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 3032 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 3033 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 3034 + nla_total_size(1) /* RTA_PREF */
61adedf3 3035 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 3036}
3037
191cd582
BH		 3038static int rt6_fill_node(struct net *net,
3039 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 3040 struct in6_addr *dst, struct in6_addr *src,
15e47304 3041 int iif, int type, u32 portid, u32 seq,
7bc570c8 3042 int prefix, int nowait, unsigned int flags)
1da177e4 3043{
4b32b5ad 3044 u32 metrics[RTAX_MAX];
1da177e4 3045 struct rtmsg *rtm;
2d7202bf 3046 struct nlmsghdr *nlh;
e3703b3d 3047 long expires;
9e762a4a 3048 u32 table;
1da177e4
LT		 3049
3050 if (prefix) { /* user wants prefix routes only */
3051 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3052 /* success since this is not a prefix route */
3053 return 1;
3054 }
3055 }
3056
15e47304 3057 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 3058 if (!nlh)
26932566 3059 return -EMSGSIZE;
2d7202bf
TG		 3060
3061 rtm = nlmsg_data(nlh);
1da177e4
LT		 3062 rtm->rtm_family = AF_INET6;
3063 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3064 rtm->rtm_src_len = rt->rt6i_src.plen;
3065 rtm->rtm_tos = 0;
c71099ac 3066 if (rt->rt6i_table)
9e762a4a 3067 table = rt->rt6i_table->tb6_id;
c71099ac 3068 else
9e762a4a
PM		 3069 table = RT6_TABLE_UNSPEC;
3070 rtm->rtm_table = table;
c78679e8
DM		 3071 if (nla_put_u32(skb, RTA_TABLE, table))
3072 goto nla_put_failure;
ef2c7d7b
ND		 3073 if (rt->rt6i_flags & RTF_REJECT) {
3074 switch (rt->dst.error) {
3075 case -EINVAL:
3076 rtm->rtm_type = RTN_BLACKHOLE;
3077 break;
3078 case -EACCES:
3079 rtm->rtm_type = RTN_PROHIBIT;
3080 break;
b4949ab2
ND		 3081 case -EAGAIN:
3082 rtm->rtm_type = RTN_THROW;
3083 break;
ef2c7d7b
ND		 3084 default:
3085 rtm->rtm_type = RTN_UNREACHABLE;
3086 break;
3087 }
3088 }
38308473 3089 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 3090 rtm->rtm_type = RTN_LOCAL;
d1918542 3091 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 3092 rtm->rtm_type = RTN_LOCAL;
3093 else
3094 rtm->rtm_type = RTN_UNICAST;
3095 rtm->rtm_flags = 0;
35103d11 3096 if (!netif_carrier_ok(rt->dst.dev)) {
cea45e20 3097 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 3098 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3099 rtm->rtm_flags |= RTNH_F_DEAD;
3100 }
1da177e4
LT		 3101 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3102 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 3103 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 3104 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 3105 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3106 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3107 rtm->rtm_protocol = RTPROT_RA;
3108 else
3109 rtm->rtm_protocol = RTPROT_KERNEL;
3110 }
1da177e4 3111
38308473 3112 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 3113 rtm->rtm_flags |= RTM_F_CLONED;
3114
3115 if (dst) {
930345ea 3116 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 3117 goto nla_put_failure;
1ab1457c 3118 rtm->rtm_dst_len = 128;
1da177e4 3119 } else if (rtm->rtm_dst_len)
930345ea 3120 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 3121 goto nla_put_failure;
1da177e4
LT		 3122#ifdef CONFIG_IPV6_SUBTREES
3123 if (src) {
930345ea 3124 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 3125 goto nla_put_failure;
1ab1457c 3126 rtm->rtm_src_len = 128;
c78679e8 3127 } else if (rtm->rtm_src_len &&
930345ea 3128 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 3129 goto nla_put_failure;
1da177e4 3130#endif
7bc570c8
YH		 3131 if (iif) {
3132#ifdef CONFIG_IPV6_MROUTE
3133 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
8229efda 3134 int err = ip6mr_get_route(net, skb, rtm, nowait);
7bc570c8
YH		 3135 if (err <= 0) {
3136 if (!nowait) {
3137 if (err == 0)
3138 return 0;
3139 goto nla_put_failure;
3140 } else {
3141 if (err == -EMSGSIZE)
3142 goto nla_put_failure;
3143 }
3144 }
3145 } else
3146#endif
c78679e8
DM		 3147 if (nla_put_u32(skb, RTA_IIF, iif))
3148 goto nla_put_failure;
7bc570c8 3149 } else if (dst) {
1da177e4 3150 struct in6_addr saddr_buf;
c78679e8 3151 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3152 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3153 goto nla_put_failure;
1da177e4 3154 }
2d7202bf 3155
c3968a85
DW		 3156 if (rt->rt6i_prefsrc.plen) {
3157 struct in6_addr saddr_buf;
4e3fd7a0 3158 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3159 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3160 goto nla_put_failure;
c3968a85
DW		 3161 }
3162
4b32b5ad
MKL		 3163 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3164 if (rt->rt6i_pmtu)
3165 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3166 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3167 goto nla_put_failure;
3168
dd0cbf29 3169 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3170 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3171 goto nla_put_failure;
94f826b8 3172 }
2d7202bf 3173
c78679e8
DM		 3174 if (rt->dst.dev &&
3175 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3176 goto nla_put_failure;
3177 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3178 goto nla_put_failure;
8253947e
LW		 3179
3180 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3181
87a50699 3182 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3183 goto nla_put_failure;
2d7202bf 3184
c78ba6d6
LR		 3185 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3186 goto nla_put_failure;
3187
61adedf3 3188 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
19e42e45 3189
053c095a
JB		 3190 nlmsg_end(skb, nlh);
3191 return 0;
2d7202bf
TG		 3192
3193nla_put_failure:
26932566
PM		 3194 nlmsg_cancel(skb, nlh);
3195 return -EMSGSIZE;
1da177e4
LT		 3196}
3197
1b43af54 3198int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3199{
3200 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3201 int prefix;
3202
2d7202bf
TG		 3203 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3204 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 3205 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3206 } else
3207 prefix = 0;
3208
191cd582
BH		 3209 return rt6_fill_node(arg->net,
3210 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3211 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 3212 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 3213}
3214
67ba4152 3215static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3216{
3b1e0a65 3217 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3218 struct nlattr *tb[RTA_MAX+1];
3219 struct rt6_info *rt;
1da177e4 3220 struct sk_buff *skb;
ab364a6f 3221 struct rtmsg *rtm;
4c9483b2 3222 struct flowi6 fl6;
72331bc0 3223 int err, iif = 0, oif = 0;
1da177e4 3224
ab364a6f
TG		 3225 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3226 if (err < 0)
3227 goto errout;
1da177e4 3228
ab364a6f 3229 err = -EINVAL;
4c9483b2 3230 memset(&fl6, 0, sizeof(fl6));
1da177e4 3231
ab364a6f
TG		 3232 if (tb[RTA_SRC]) {
3233 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3234 goto errout;
3235
4e3fd7a0 3236 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3237 }
3238
3239 if (tb[RTA_DST]) {
3240 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3241 goto errout;
3242
4e3fd7a0 3243 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3244 }
3245
3246 if (tb[RTA_IIF])
3247 iif = nla_get_u32(tb[RTA_IIF]);
3248
3249 if (tb[RTA_OIF])
72331bc0 3250 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3251
2e47b291
LC		 3252 if (tb[RTA_MARK])
3253 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3254
1da177e4
LT		 3255 if (iif) {
3256 struct net_device *dev;
72331bc0
SL		 3257 int flags = 0;
3258
5578689a 3259 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3260 if (!dev) {
3261 err = -ENODEV;
ab364a6f 3262 goto errout;
1da177e4 3263 }
72331bc0
SL		 3264
3265 fl6.flowi6_iif = iif;
3266
3267 if (!ipv6_addr_any(&fl6.saddr))
3268 flags |= RT6_LOOKUP_F_HAS_SADDR;
3269
3270 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3271 flags);
3272 } else {
3273 fl6.flowi6_oif = oif;
3274
3275 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3276 }
3277
ab364a6f 3278 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3279 if (!skb) {
94e187c0 3280 ip6_rt_put(rt);
ab364a6f
TG		 3281 err = -ENOBUFS;
3282 goto errout;
3283 }
1da177e4 3284
ab364a6f
TG		 3285 /* Reserve room for dummy headers, this skb can pass
3286 through good chunk of routing engine.
3287 */
459a98ed 3288 skb_reset_mac_header(skb);
ab364a6f 3289 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 3290
d8d1f30b 3291 skb_dst_set(skb, &rt->dst);
1da177e4 3292
4c9483b2 3293 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3294 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 3295 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 3296 if (err < 0) {
ab364a6f
TG		 3297 kfree_skb(skb);
3298 goto errout;
1da177e4
LT		 3299 }
3300
15e47304 3301 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3302errout:
1da177e4 3303 return err;
1da177e4
LT		 3304}
3305
86872cb5 3306void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 3307{
3308 struct sk_buff *skb;
5578689a 3309 struct net *net = info->nl_net;
528c4ceb
DL		 3310 u32 seq;
3311 int err;
3312
3313 err = -ENOBUFS;
38308473 3314 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3315
19e42e45 3316 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3317 if (!skb)
21713ebc
TG		 3318 goto errout;
3319
191cd582 3320 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
15e47304 3321 event, info->portid, seq, 0, 0, 0);
26932566
PM		 3322 if (err < 0) {
3323 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3324 WARN_ON(err == -EMSGSIZE);
3325 kfree_skb(skb);
3326 goto errout;
3327 }
15e47304 3328 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3329 info->nlh, gfp_any());
3330 return;
21713ebc
TG		 3331errout:
3332 if (err < 0)
5578689a 3333 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3334}
3335
8ed67789 3336static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3337 unsigned long event, void *ptr)
8ed67789 3338{
351638e7 3339 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3340 struct net *net = dev_net(dev);
8ed67789
DL		 3341
3342 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3343 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3344 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3345#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3346 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3347 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3348 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3349 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3350#endif
3351 }
3352
3353 return NOTIFY_OK;
3354}
3355
1da177e4
LT		 3356/*
3357 * /proc
3358 */
3359
3360#ifdef CONFIG_PROC_FS
3361
33120b30
AD		 3362static const struct file_operations ipv6_route_proc_fops = {
3363 .owner = THIS_MODULE,
3364 .open = ipv6_route_open,
3365 .read = seq_read,
3366 .llseek = seq_lseek,
8d2ca1d7 3367 .release = seq_release_net,
33120b30
AD		 3368};
3369
1da177e4
LT		 3370static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3371{
69ddb805 3372 struct net *net = (struct net *)seq->private;
1da177e4 3373 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3374 net->ipv6.rt6_stats->fib_nodes,
3375 net->ipv6.rt6_stats->fib_route_nodes,
3376 net->ipv6.rt6_stats->fib_rt_alloc,
3377 net->ipv6.rt6_stats->fib_rt_entries,
3378 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3379 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3380 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3381
3382 return 0;
3383}
3384
3385static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3386{
de05c557 3387 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3388}
3389
9a32144e 3390static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3391 .owner = THIS_MODULE,
3392 .open = rt6_stats_seq_open,
3393 .read = seq_read,
3394 .llseek = seq_lseek,
b6fcbdb4 3395 .release = single_release_net,
1da177e4
LT		 3396};
3397#endif /* CONFIG_PROC_FS */
3398
3399#ifdef CONFIG_SYSCTL
3400
1da177e4 3401static
fe2c6338 3402int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3403 void __user *buffer, size_t *lenp, loff_t *ppos)
3404{
c486da34
LAG		 3405 struct net *net;
3406 int delay;
3407 if (!write)
1da177e4 3408 return -EINVAL;
c486da34
LAG		 3409
3410 net = (struct net *)ctl->extra1;
3411 delay = net->ipv6.sysctl.flush_delay;
3412 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3413 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3414 return 0;
1da177e4
LT		 3415}
3416
fe2c6338 3417struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3418 {
1da177e4 3419 .procname = "flush",
4990509f 3420 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3421 .maxlen = sizeof(int),
89c8b3a1 3422 .mode = 0200,
6d9f239a 3423 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3424 },
3425 {
1da177e4 3426 .procname = "gc_thresh",
9a7ec3a9 3427 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3428 .maxlen = sizeof(int),
3429 .mode = 0644,
6d9f239a 3430 .proc_handler = proc_dointvec,
1da177e4
LT		 3431 },
3432 {
1da177e4 3433 .procname = "max_size",
4990509f 3434 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3435 .maxlen = sizeof(int),
3436 .mode = 0644,
6d9f239a 3437 .proc_handler = proc_dointvec,
1da177e4
LT		 3438 },
3439 {
1da177e4 3440 .procname = "gc_min_interval",
4990509f 3441 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3442 .maxlen = sizeof(int),
3443 .mode = 0644,
6d9f239a 3444 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3445 },
3446 {
1da177e4 3447 .procname = "gc_timeout",
4990509f 3448 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3449 .maxlen = sizeof(int),
3450 .mode = 0644,
6d9f239a 3451 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3452 },
3453 {
1da177e4 3454 .procname = "gc_interval",
4990509f 3455 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3456 .maxlen = sizeof(int),
3457 .mode = 0644,
6d9f239a 3458 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3459 },
3460 {
1da177e4 3461 .procname = "gc_elasticity",
4990509f 3462 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3463 .maxlen = sizeof(int),
3464 .mode = 0644,
f3d3f616 3465 .proc_handler = proc_dointvec,
1da177e4
LT		 3466 },
3467 {
1da177e4 3468 .procname = "mtu_expires",
4990509f 3469 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3470 .maxlen = sizeof(int),
3471 .mode = 0644,
6d9f239a 3472 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3473 },
3474 {
1da177e4 3475 .procname = "min_adv_mss",
4990509f 3476 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3477 .maxlen = sizeof(int),
3478 .mode = 0644,
f3d3f616 3479 .proc_handler = proc_dointvec,
1da177e4
LT		 3480 },
3481 {
1da177e4 3482 .procname = "gc_min_interval_ms",
4990509f 3483 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3484 .maxlen = sizeof(int),
3485 .mode = 0644,
6d9f239a 3486 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3487 },
f8572d8f 3488 { }
1da177e4
LT		 3489};
3490
2c8c1e72 3491struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3492{
3493 struct ctl_table *table;
3494
3495 table = kmemdup(ipv6_route_table_template,
3496 sizeof(ipv6_route_table_template),
3497 GFP_KERNEL);
5ee09105
YH		 3498
3499 if (table) {
3500 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3501 table[0].extra1 = net;
86393e52 3502 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3503 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3504 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3505 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3506 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3507 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3508 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3509 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3510 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3511
3512 /* Don't export sysctls to unprivileged users */
3513 if (net->user_ns != &init_user_ns)
3514 table[0].procname = NULL;
5ee09105
YH		 3515 }
3516
760f2d01
DL		 3517 return table;
3518}
1da177e4
LT		 3519#endif
3520
2c8c1e72 3521static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3522{
633d424b 3523 int ret = -ENOMEM;
8ed67789 3524
86393e52
AD		 3525 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3526 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3527
fc66f95c
ED		 3528 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3529 goto out_ip6_dst_ops;
3530
8ed67789
DL		 3531 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3532 sizeof(*net->ipv6.ip6_null_entry),
3533 GFP_KERNEL);
3534 if (!net->ipv6.ip6_null_entry)
fc66f95c 3535 goto out_ip6_dst_entries;
d8d1f30b 3536 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3537 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3538 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3539 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3540 ip6_template_metrics, true);
8ed67789
DL		 3541
3542#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3543 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3544 sizeof(*net->ipv6.ip6_prohibit_entry),
3545 GFP_KERNEL);
68fffc67
PZ		 3546 if (!net->ipv6.ip6_prohibit_entry)
3547 goto out_ip6_null_entry;
d8d1f30b 3548 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3549 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3550 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3551 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3552 ip6_template_metrics, true);
8ed67789
DL		 3553
3554 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3555 sizeof(*net->ipv6.ip6_blk_hole_entry),
3556 GFP_KERNEL);
68fffc67
PZ		 3557 if (!net->ipv6.ip6_blk_hole_entry)
3558 goto out_ip6_prohibit_entry;
d8d1f30b 3559 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3560 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3561 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3562 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3563 ip6_template_metrics, true);
8ed67789
DL		 3564#endif
3565
b339a47c
PZ		 3566 net->ipv6.sysctl.flush_delay = 0;
3567 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3568 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3569 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3570 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3571 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3572 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3573 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3574
6891a346
BT		 3575 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3576
8ed67789
DL		 3577 ret = 0;
3578out:
3579 return ret;
f2fc6a54 3580
68fffc67
PZ		 3581#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3582out_ip6_prohibit_entry:
3583 kfree(net->ipv6.ip6_prohibit_entry);
3584out_ip6_null_entry:
3585 kfree(net->ipv6.ip6_null_entry);
3586#endif
fc66f95c
ED		 3587out_ip6_dst_entries:
3588 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3589out_ip6_dst_ops:
f2fc6a54 3590 goto out;
cdb18761
DL		 3591}
3592
2c8c1e72 3593static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3594{
8ed67789
DL		 3595 kfree(net->ipv6.ip6_null_entry);
3596#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3597 kfree(net->ipv6.ip6_prohibit_entry);
3598 kfree(net->ipv6.ip6_blk_hole_entry);
3599#endif
41bb78b4 3600 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3601}
3602
d189634e
TG		 3603static int __net_init ip6_route_net_init_late(struct net *net)
3604{
3605#ifdef CONFIG_PROC_FS
d4beaa66
G		 3606 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3607 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3608#endif
3609 return 0;
3610}
3611
3612static void __net_exit ip6_route_net_exit_late(struct net *net)
3613{
3614#ifdef CONFIG_PROC_FS
ece31ffd
G		 3615 remove_proc_entry("ipv6_route", net->proc_net);
3616 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3617#endif
3618}
3619
cdb18761
DL		 3620static struct pernet_operations ip6_route_net_ops = {
3621 .init = ip6_route_net_init,
3622 .exit = ip6_route_net_exit,
3623};
3624
c3426b47
DM		 3625static int __net_init ipv6_inetpeer_init(struct net *net)
3626{
3627 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3628
3629 if (!bp)
3630 return -ENOMEM;
3631 inet_peer_base_init(bp);
3632 net->ipv6.peers = bp;
3633 return 0;
3634}
3635
3636static void __net_exit ipv6_inetpeer_exit(struct net *net)
3637{
3638 struct inet_peer_base *bp = net->ipv6.peers;
3639
3640 net->ipv6.peers = NULL;
56a6b248 3641 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3642 kfree(bp);
3643}
3644
2b823f72 3645static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3646 .init = ipv6_inetpeer_init,
3647 .exit = ipv6_inetpeer_exit,
3648};
3649
d189634e
TG		 3650static struct pernet_operations ip6_route_net_late_ops = {
3651 .init = ip6_route_net_init_late,
3652 .exit = ip6_route_net_exit_late,
3653};
3654
8ed67789
DL		 3655static struct notifier_block ip6_route_dev_notifier = {
3656 .notifier_call = ip6_route_dev_notify,
3657 .priority = 0,
3658};
3659
433d49c3 3660int __init ip6_route_init(void)
1da177e4 3661{
433d49c3 3662 int ret;
8d0b94af 3663 int cpu;
433d49c3 3664
9a7ec3a9
DL		 3665 ret = -ENOMEM;
3666 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3667 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3668 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3669 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3670 goto out;
14e50e57 3671
fc66f95c 3672 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3673 if (ret)
bdb3289f 3674 goto out_kmem_cache;
bdb3289f 3675
c3426b47
DM		 3676 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3677 if (ret)
e8803b6c 3678 goto out_dst_entries;
2a0c451a 3679
7e52b33b
DM		 3680 ret = register_pernet_subsys(&ip6_route_net_ops);
3681 if (ret)
3682 goto out_register_inetpeer;
c3426b47 3683
5dc121e9
AE		 3684 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3685
8ed67789
DL		 3686 /* Registering of the loopback is done before this portion of code,
3687 * the loopback reference in rt6_info will not be taken, do it
3688 * manually for init_net */
d8d1f30b 3689 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3690 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3691 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3692 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3693 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3694 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3695 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3696 #endif
e8803b6c 3697 ret = fib6_init();
433d49c3 3698 if (ret)
8ed67789 3699 goto out_register_subsys;
433d49c3 3700
433d49c3
DL		 3701 ret = xfrm6_init();
3702 if (ret)
e8803b6c 3703 goto out_fib6_init;
c35b7e72 3704
433d49c3
DL		 3705 ret = fib6_rules_init();
3706 if (ret)
3707 goto xfrm6_init;
7e5449c2 3708
d189634e
TG		 3709 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3710 if (ret)
3711 goto fib6_rules_init;
3712
433d49c3 3713 ret = -ENOBUFS;
c7ac8679
GR		 3714 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3715 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3716 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3717 goto out_register_late_subsys;
c127ea2c 3718
8ed67789 3719 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3720 if (ret)
d189634e 3721 goto out_register_late_subsys;
8ed67789 3722
8d0b94af
MKL		 3723 for_each_possible_cpu(cpu) {
3724 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3725
3726 INIT_LIST_HEAD(&ul->head);
3727 spin_lock_init(&ul->lock);
3728 }
3729
433d49c3
DL		 3730out:
3731 return ret;
3732
d189634e
TG		 3733out_register_late_subsys:
3734 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3735fib6_rules_init:
433d49c3
DL		 3736 fib6_rules_cleanup();
3737xfrm6_init:
433d49c3 3738 xfrm6_fini();
2a0c451a
TG		 3739out_fib6_init:
3740 fib6_gc_cleanup();
8ed67789
DL		 3741out_register_subsys:
3742 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3743out_register_inetpeer:
3744 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3745out_dst_entries:
3746 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3747out_kmem_cache:
f2fc6a54 3748 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3749 goto out;
1da177e4
LT		 3750}
3751
3752void ip6_route_cleanup(void)
3753{
8ed67789 3754 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3755 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3756 fib6_rules_cleanup();
1da177e4 3757 xfrm6_fini();
1da177e4 3758 fib6_gc_cleanup();
c3426b47 3759 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3760 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3761 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3762 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3763}
Linux kernel - Deliverables
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