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arm64: cpufeature: Schedule enable() calls instead of calling them via IPI
[linux-2.6-block.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>
ca254490 64#include <net/l3mdev.h>
b811580d 65#include <trace/events/fib6.h>
1da177e4
LT		 66
67#include <asm/uaccess.h>
68
69#ifdef CONFIG_SYSCTL
70#include <linux/sysctl.h>
71#endif
72
afc154e9 73enum rt6_nud_state {
7e980569
JB		 74 RT6_NUD_FAIL_HARD = -3,
75 RT6_NUD_FAIL_PROBE = -2,
76 RT6_NUD_FAIL_DO_RR = -1,
afc154e9
HFS		 77 RT6_NUD_SUCCEED = 1
78};
79
83a09abd 80static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
1da177e4 81static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
0dbaee3b 82static unsigned int ip6_default_advmss(const struct dst_entry *dst);
ebb762f2 83static unsigned int ip6_mtu(const struct dst_entry *dst);
1da177e4
LT		 84static struct dst_entry *ip6_negative_advice(struct dst_entry *);
85static void ip6_dst_destroy(struct dst_entry *);
86static void ip6_dst_ifdown(struct dst_entry *,
87 struct net_device *dev, int how);
569d3645 88static int ip6_dst_gc(struct dst_ops *ops);
1da177e4
LT		 89
90static int ip6_pkt_discard(struct sk_buff *skb);
ede2059d 91static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
7150aede 92static int ip6_pkt_prohibit(struct sk_buff *skb);
ede2059d 93static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1da177e4 94static void ip6_link_failure(struct sk_buff *skb);
6700c270
DM		 95static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
96 struct sk_buff *skb, u32 mtu);
97static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
98 struct sk_buff *skb);
4b32b5ad 99static void rt6_dst_from_metrics_check(struct rt6_info *rt);
52bd4c0c 100static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
1da177e4 101
70ceb4f5 102#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 103static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 104 const struct in6_addr *prefix, int prefixlen,
105 const struct in6_addr *gwaddr, int ifindex,
95c96174 106 unsigned int pref);
efa2cea0 107static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 108 const struct in6_addr *prefix, int prefixlen,
109 const struct in6_addr *gwaddr, int ifindex);
70ceb4f5
YH		 110#endif
111
8d0b94af
MKL		 112struct uncached_list {
113 spinlock_t lock;
114 struct list_head head;
115};
116
117static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
118
119static void rt6_uncached_list_add(struct rt6_info *rt)
120{
121 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
122
123 rt->dst.flags |= DST_NOCACHE;
124 rt->rt6i_uncached_list = ul;
125
126 spin_lock_bh(&ul->lock);
127 list_add_tail(&rt->rt6i_uncached, &ul->head);
128 spin_unlock_bh(&ul->lock);
129}
130
131static void rt6_uncached_list_del(struct rt6_info *rt)
132{
133 if (!list_empty(&rt->rt6i_uncached)) {
134 struct uncached_list *ul = rt->rt6i_uncached_list;
135
136 spin_lock_bh(&ul->lock);
137 list_del(&rt->rt6i_uncached);
138 spin_unlock_bh(&ul->lock);
139 }
140}
141
142static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
143{
144 struct net_device *loopback_dev = net->loopback_dev;
145 int cpu;
146
e332bc67
EB		 147 if (dev == loopback_dev)
148 return;
149
8d0b94af
MKL		 150 for_each_possible_cpu(cpu) {
151 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
152 struct rt6_info *rt;
153
154 spin_lock_bh(&ul->lock);
155 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
156 struct inet6_dev *rt_idev = rt->rt6i_idev;
157 struct net_device *rt_dev = rt->dst.dev;
158
e332bc67 159 if (rt_idev->dev == dev) {
8d0b94af
MKL		 160 rt->rt6i_idev = in6_dev_get(loopback_dev);
161 in6_dev_put(rt_idev);
162 }
163
e332bc67 164 if (rt_dev == dev) {
8d0b94af
MKL		 165 rt->dst.dev = loopback_dev;
166 dev_hold(rt->dst.dev);
167 dev_put(rt_dev);
168 }
169 }
170 spin_unlock_bh(&ul->lock);
171 }
172}
173
d52d3997
MKL		 174static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
175{
176 return dst_metrics_write_ptr(rt->dst.from);
177}
178
06582540
DM		 179static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
180{
4b32b5ad 181 struct rt6_info *rt = (struct rt6_info *)dst;
06582540 182
d52d3997
MKL		 183 if (rt->rt6i_flags & RTF_PCPU)
184 return rt6_pcpu_cow_metrics(rt);
185 else if (rt->rt6i_flags & RTF_CACHE)
4b32b5ad
MKL		 186 return NULL;
187 else
3b471175 188 return dst_cow_metrics_generic(dst, old);
06582540
DM		 189}
190
f894cbf8
DM		 191static inline const void *choose_neigh_daddr(struct rt6_info *rt,
192 struct sk_buff *skb,
193 const void *daddr)
39232973
DM		 194{
195 struct in6_addr *p = &rt->rt6i_gateway;
196
a7563f34 197 if (!ipv6_addr_any(p))
39232973 198 return (const void *) p;
f894cbf8
DM		 199 else if (skb)
200 return &ipv6_hdr(skb)->daddr;
39232973
DM		 201 return daddr;
202}
203
f894cbf8
DM		 204static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
205 struct sk_buff *skb,
206 const void *daddr)
d3aaeb38 207{
39232973
DM		 208 struct rt6_info *rt = (struct rt6_info *) dst;
209 struct neighbour *n;
210
f894cbf8 211 daddr = choose_neigh_daddr(rt, skb, daddr);
8e022ee6 212 n = __ipv6_neigh_lookup(dst->dev, daddr);
f83c7790
DM		 213 if (n)
214 return n;
215 return neigh_create(&nd_tbl, daddr, dst->dev);
216}
217
9a7ec3a9 218static struct dst_ops ip6_dst_ops_template = {
1da177e4 219 .family = AF_INET6,
1da177e4
LT		 220 .gc = ip6_dst_gc,
221 .gc_thresh = 1024,
222 .check = ip6_dst_check,
0dbaee3b 223 .default_advmss = ip6_default_advmss,
ebb762f2 224 .mtu = ip6_mtu,
06582540 225 .cow_metrics = ipv6_cow_metrics,
1da177e4
LT		 226 .destroy = ip6_dst_destroy,
227 .ifdown = ip6_dst_ifdown,
228 .negative_advice = ip6_negative_advice,
229 .link_failure = ip6_link_failure,
230 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 231 .redirect = rt6_do_redirect,
9f8955cc 232 .local_out = __ip6_local_out,
d3aaeb38 233 .neigh_lookup = ip6_neigh_lookup,
1da177e4
LT		 234};
235
ebb762f2 236static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
ec831ea7 237{
618f9bc7
SK		 238 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
239
240 return mtu ? : dst->dev->mtu;
ec831ea7
RD		 241}
242
6700c270
DM		 243static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
244 struct sk_buff *skb, u32 mtu)
14e50e57
DM		 245{
246}
247
6700c270
DM		 248static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
249 struct sk_buff *skb)
b587ee3b
DM		 250{
251}
252
14e50e57
DM		 253static struct dst_ops ip6_dst_blackhole_ops = {
254 .family = AF_INET6,
14e50e57
DM		 255 .destroy = ip6_dst_destroy,
256 .check = ip6_dst_check,
ebb762f2 257 .mtu = ip6_blackhole_mtu,
214f45c9 258 .default_advmss = ip6_default_advmss,
14e50e57 259 .update_pmtu = ip6_rt_blackhole_update_pmtu,
b587ee3b 260 .redirect = ip6_rt_blackhole_redirect,
0a1f5962 261 .cow_metrics = dst_cow_metrics_generic,
d3aaeb38 262 .neigh_lookup = ip6_neigh_lookup,
14e50e57
DM		 263};
264
62fa8a84 265static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 266 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 267};
268
fb0af4c7 269static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 270 .dst = {
271 .__refcnt = ATOMIC_INIT(1),
272 .__use = 1,
2c20cbd7 273 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 274 .error = -ENETUNREACH,
d8d1f30b
CG		 275 .input = ip6_pkt_discard,
276 .output = ip6_pkt_discard_out,
1da177e4
LT		 277 },
278 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 279 .rt6i_protocol = RTPROT_KERNEL,
1da177e4
LT		 280 .rt6i_metric = ~(u32) 0,
281 .rt6i_ref = ATOMIC_INIT(1),
282};
283
101367c2
TG		 284#ifdef CONFIG_IPV6_MULTIPLE_TABLES
285
fb0af4c7 286static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 287 .dst = {
288 .__refcnt = ATOMIC_INIT(1),
289 .__use = 1,
2c20cbd7 290 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 291 .error = -EACCES,
d8d1f30b
CG		 292 .input = ip6_pkt_prohibit,
293 .output = ip6_pkt_prohibit_out,
101367c2
TG		 294 },
295 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 296 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 297 .rt6i_metric = ~(u32) 0,
298 .rt6i_ref = ATOMIC_INIT(1),
299};
300
fb0af4c7 301static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 302 .dst = {
303 .__refcnt = ATOMIC_INIT(1),
304 .__use = 1,
2c20cbd7 305 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 306 .error = -EINVAL,
d8d1f30b 307 .input = dst_discard,
ede2059d 308 .output = dst_discard_out,
101367c2
TG		 309 },
310 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
4f724279 311 .rt6i_protocol = RTPROT_KERNEL,
101367c2
TG		 312 .rt6i_metric = ~(u32) 0,
313 .rt6i_ref = ATOMIC_INIT(1),
314};
315
316#endif
317
ebfa45f0
MKL		 318static void rt6_info_init(struct rt6_info *rt)
319{
320 struct dst_entry *dst = &rt->dst;
321
322 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
323 INIT_LIST_HEAD(&rt->rt6i_siblings);
324 INIT_LIST_HEAD(&rt->rt6i_uncached);
325}
326
1da177e4 327/* allocate dst with ip6_dst_ops */
d52d3997
MKL		 328static struct rt6_info *__ip6_dst_alloc(struct net *net,
329 struct net_device *dev,
ad706862 330 int flags)
1da177e4 331{
97bab73f 332 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
6f3118b5 333 0, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 334
ebfa45f0
MKL		 335 if (rt)
336 rt6_info_init(rt);
8104891b 337
cf911662 338 return rt;
1da177e4
LT		 339}
340
9ab179d8
DA		 341struct rt6_info *ip6_dst_alloc(struct net *net,
342 struct net_device *dev,
343 int flags)
d52d3997 344{
ad706862 345 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
d52d3997
MKL		 346
347 if (rt) {
348 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
349 if (rt->rt6i_pcpu) {
350 int cpu;
351
352 for_each_possible_cpu(cpu) {
353 struct rt6_info **p;
354
355 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
356 /* no one shares rt */
357 *p = NULL;
358 }
359 } else {
360 dst_destroy((struct dst_entry *)rt);
361 return NULL;
362 }
363 }
364
365 return rt;
366}
9ab179d8 367EXPORT_SYMBOL(ip6_dst_alloc);
d52d3997 368
1da177e4
LT		 369static void ip6_dst_destroy(struct dst_entry *dst)
370{
371 struct rt6_info *rt = (struct rt6_info *)dst;
ecd98837 372 struct dst_entry *from = dst->from;
8d0b94af 373 struct inet6_dev *idev;
1da177e4 374
4b32b5ad 375 dst_destroy_metrics_generic(dst);
87775312 376 free_percpu(rt->rt6i_pcpu);
8d0b94af
MKL		 377 rt6_uncached_list_del(rt);
378
379 idev = rt->rt6i_idev;
38308473 380 if (idev) {
1da177e4
LT		 381 rt->rt6i_idev = NULL;
382 in6_dev_put(idev);
1ab1457c 383 }
1716a961 384
ecd98837
YH		 385 dst->from = NULL;
386 dst_release(from);
b3419363
DM		 387}
388
1da177e4
LT		 389static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
390 int how)
391{
392 struct rt6_info *rt = (struct rt6_info *)dst;
393 struct inet6_dev *idev = rt->rt6i_idev;
5a3e55d6 394 struct net_device *loopback_dev =
c346dca1 395 dev_net(dev)->loopback_dev;
1da177e4 396
97cac082
DM		 397 if (dev != loopback_dev) {
398 if (idev && idev->dev == dev) {
399 struct inet6_dev *loopback_idev =
400 in6_dev_get(loopback_dev);
401 if (loopback_idev) {
402 rt->rt6i_idev = loopback_idev;
403 in6_dev_put(idev);
404 }
405 }
1da177e4
LT		 406 }
407}
408
5973fb1e
MKL		 409static bool __rt6_check_expired(const struct rt6_info *rt)
410{
411 if (rt->rt6i_flags & RTF_EXPIRES)
412 return time_after(jiffies, rt->dst.expires);
413 else
414 return false;
415}
416
a50feda5 417static bool rt6_check_expired(const struct rt6_info *rt)
1da177e4 418{
1716a961
G		 419 if (rt->rt6i_flags & RTF_EXPIRES) {
420 if (time_after(jiffies, rt->dst.expires))
a50feda5 421 return true;
1716a961 422 } else if (rt->dst.from) {
3fd91fb3 423 return rt6_check_expired((struct rt6_info *) rt->dst.from);
1716a961 424 }
a50feda5 425 return false;
1da177e4
LT		 426}
427
51ebd318
ND		 428/* Multipath route selection:
429 * Hash based function using packet header and flowlabel.
430 * Adapted from fib_info_hashfn()
431 */
432static int rt6_info_hash_nhsfn(unsigned int candidate_count,
433 const struct flowi6 *fl6)
434{
644d0e65 435 return get_hash_from_flowi6(fl6) % candidate_count;
51ebd318
ND		 436}
437
438static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
52bd4c0c
ND		 439 struct flowi6 *fl6, int oif,
440 int strict)
51ebd318
ND		 441{
442 struct rt6_info *sibling, *next_sibling;
443 int route_choosen;
444
445 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
446 /* Don't change the route, if route_choosen == 0
447 * (siblings does not include ourself)
448 */
449 if (route_choosen)
450 list_for_each_entry_safe(sibling, next_sibling,
451 &match->rt6i_siblings, rt6i_siblings) {
452 route_choosen--;
453 if (route_choosen == 0) {
52bd4c0c
ND		 454 if (rt6_score_route(sibling, oif, strict) < 0)
455 break;
51ebd318
ND		 456 match = sibling;
457 break;
458 }
459 }
460 return match;
461}
462
1da177e4 463/*
c71099ac 464 * Route lookup. Any table->tb6_lock is implied.
1da177e4
LT		 465 */
466
8ed67789
DL		 467static inline struct rt6_info *rt6_device_match(struct net *net,
468 struct rt6_info *rt,
b71d1d42 469 const struct in6_addr *saddr,
1da177e4 470 int oif,
d420895e 471 int flags)
1da177e4
LT		 472{
473 struct rt6_info *local = NULL;
474 struct rt6_info *sprt;
475
dd3abc4e
YH		 476 if (!oif && ipv6_addr_any(saddr))
477 goto out;
478
d8d1f30b 479 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
d1918542 480 struct net_device *dev = sprt->dst.dev;
dd3abc4e
YH		 481
482 if (oif) {
1da177e4
LT		 483 if (dev->ifindex == oif)
484 return sprt;
485 if (dev->flags & IFF_LOOPBACK) {
38308473 486 if (!sprt->rt6i_idev ||
1da177e4 487 sprt->rt6i_idev->dev->ifindex != oif) {
17fb0b2b 488 if (flags & RT6_LOOKUP_F_IFACE)
1da177e4 489 continue;
17fb0b2b
DA		 490 if (local &&
491 local->rt6i_idev->dev->ifindex == oif)
1da177e4
LT		 492 continue;
493 }
494 local = sprt;
495 }
dd3abc4e
YH		 496 } else {
497 if (ipv6_chk_addr(net, saddr, dev,
498 flags & RT6_LOOKUP_F_IFACE))
499 return sprt;
1da177e4 500 }
dd3abc4e 501 }
1da177e4 502
dd3abc4e 503 if (oif) {
1da177e4
LT		 504 if (local)
505 return local;
506
d420895e 507 if (flags & RT6_LOOKUP_F_IFACE)
8ed67789 508 return net->ipv6.ip6_null_entry;
1da177e4 509 }
dd3abc4e 510out:
1da177e4
LT		 511 return rt;
512}
513
27097255 514#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 515struct __rt6_probe_work {
516 struct work_struct work;
517 struct in6_addr target;
518 struct net_device *dev;
519};
520
521static void rt6_probe_deferred(struct work_struct *w)
522{
523 struct in6_addr mcaddr;
524 struct __rt6_probe_work *work =
525 container_of(w, struct __rt6_probe_work, work);
526
527 addrconf_addr_solict_mult(&work->target, &mcaddr);
304d888b 528 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL);
c2f17e82 529 dev_put(work->dev);
662f5533 530 kfree(work);
c2f17e82
HFS		 531}
532
27097255
YH		 533static void rt6_probe(struct rt6_info *rt)
534{
990edb42 535 struct __rt6_probe_work *work;
f2c31e32 536 struct neighbour *neigh;
27097255
YH		 537 /*
538 * Okay, this does not seem to be appropriate
539 * for now, however, we need to check if it
540 * is really so; aka Router Reachability Probing.
541 *
542 * Router Reachability Probe MUST be rate-limited
543 * to no more than one per minute.
544 */
2152caea 545 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
7ff74a59 546 return;
2152caea
YH		 547 rcu_read_lock_bh();
548 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
549 if (neigh) {
8d6c31bf
MKL		 550 if (neigh->nud_state & NUD_VALID)
551 goto out;
552
990edb42 553 work = NULL;
2152caea 554 write_lock(&neigh->lock);
990edb42
MKL		 555 if (!(neigh->nud_state & NUD_VALID) &&
556 time_after(jiffies,
557 neigh->updated +
558 rt->rt6i_idev->cnf.rtr_probe_interval)) {
559 work = kmalloc(sizeof(*work), GFP_ATOMIC);
560 if (work)
561 __neigh_set_probe_once(neigh);
c2f17e82 562 }
2152caea 563 write_unlock(&neigh->lock);
990edb42
MKL		 564 } else {
565 work = kmalloc(sizeof(*work), GFP_ATOMIC);
f2c31e32 566 }
990edb42
MKL		 567
568 if (work) {
569 INIT_WORK(&work->work, rt6_probe_deferred);
570 work->target = rt->rt6i_gateway;
571 dev_hold(rt->dst.dev);
572 work->dev = rt->dst.dev;
573 schedule_work(&work->work);
574 }
575
8d6c31bf 576out:
2152caea 577 rcu_read_unlock_bh();
27097255
YH		 578}
579#else
580static inline void rt6_probe(struct rt6_info *rt)
581{
27097255
YH		 582}
583#endif
584
1da177e4 585/*
554cfb7e 586 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 587 */
b6f99a21 588static inline int rt6_check_dev(struct rt6_info *rt, int oif)
554cfb7e 589{
d1918542 590 struct net_device *dev = rt->dst.dev;
161980f4 591 if (!oif || dev->ifindex == oif)
554cfb7e 592 return 2;
161980f4
DM		 593 if ((dev->flags & IFF_LOOPBACK) &&
594 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
595 return 1;
596 return 0;
554cfb7e 597}
1da177e4 598
afc154e9 599static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
1da177e4 600{
f2c31e32 601 struct neighbour *neigh;
afc154e9 602 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
f2c31e32 603
4d0c5911
YH		 604 if (rt->rt6i_flags & RTF_NONEXTHOP ||
605 !(rt->rt6i_flags & RTF_GATEWAY))
afc154e9 606 return RT6_NUD_SUCCEED;
145a3621
YH		 607
608 rcu_read_lock_bh();
609 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
610 if (neigh) {
611 read_lock(&neigh->lock);
554cfb7e 612 if (neigh->nud_state & NUD_VALID)
afc154e9 613 ret = RT6_NUD_SUCCEED;
398bcbeb 614#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 615 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 616 ret = RT6_NUD_SUCCEED;
7e980569
JB		 617 else
618 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 619#endif
145a3621 620 read_unlock(&neigh->lock);
afc154e9
HFS		 621 } else {
622 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 623 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 624 }
145a3621
YH		 625 rcu_read_unlock_bh();
626
a5a81f0b 627 return ret;
1da177e4
LT		 628}
629
554cfb7e
YH		 630static int rt6_score_route(struct rt6_info *rt, int oif,
631 int strict)
1da177e4 632{
a5a81f0b 633 int m;
1ab1457c 634
4d0c5911 635 m = rt6_check_dev(rt, oif);
77d16f45 636 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 637 return RT6_NUD_FAIL_HARD;
ebacaaa0
YH		 638#ifdef CONFIG_IPV6_ROUTER_PREF
639 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
640#endif
afc154e9
HFS		 641 if (strict & RT6_LOOKUP_F_REACHABLE) {
642 int n = rt6_check_neigh(rt);
643 if (n < 0)
644 return n;
645 }
554cfb7e
YH		 646 return m;
647}
648
f11e6659 649static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
afc154e9
HFS		 650 int *mpri, struct rt6_info *match,
651 bool *do_rr)
554cfb7e 652{
f11e6659 653 int m;
afc154e9 654 bool match_do_rr = false;
35103d11
AG		 655 struct inet6_dev *idev = rt->rt6i_idev;
656 struct net_device *dev = rt->dst.dev;
657
658 if (dev && !netif_carrier_ok(dev) &&
659 idev->cnf.ignore_routes_with_linkdown)
660 goto out;
f11e6659
DM		 661
662 if (rt6_check_expired(rt))
663 goto out;
664
665 m = rt6_score_route(rt, oif, strict);
7e980569 666 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 667 match_do_rr = true;
668 m = 0; /* lowest valid score */
7e980569 669 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 670 goto out;
afc154e9
HFS		 671 }
672
673 if (strict & RT6_LOOKUP_F_REACHABLE)
674 rt6_probe(rt);
f11e6659 675
7e980569 676 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 677 if (m > *mpri) {
afc154e9 678 *do_rr = match_do_rr;
f11e6659
DM		 679 *mpri = m;
680 match = rt;
f11e6659 681 }
f11e6659
DM		 682out:
683 return match;
684}
685
686static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
687 struct rt6_info *rr_head,
afc154e9
HFS		 688 u32 metric, int oif, int strict,
689 bool *do_rr)
f11e6659 690{
9fbdcfaf 691 struct rt6_info *rt, *match, *cont;
554cfb7e 692 int mpri = -1;
1da177e4 693
f11e6659 694 match = NULL;
9fbdcfaf
SK		 695 cont = NULL;
696 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
697 if (rt->rt6i_metric != metric) {
698 cont = rt;
699 break;
700 }
701
702 match = find_match(rt, oif, strict, &mpri, match, do_rr);
703 }
704
705 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
706 if (rt->rt6i_metric != metric) {
707 cont = rt;
708 break;
709 }
710
afc154e9 711 match = find_match(rt, oif, strict, &mpri, match, do_rr);
9fbdcfaf
SK		 712 }
713
714 if (match || !cont)
715 return match;
716
717 for (rt = cont; rt; rt = rt->dst.rt6_next)
afc154e9 718 match = find_match(rt, oif, strict, &mpri, match, do_rr);
1da177e4 719
f11e6659
DM		 720 return match;
721}
1da177e4 722
f11e6659
DM		 723static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
724{
725 struct rt6_info *match, *rt0;
8ed67789 726 struct net *net;
afc154e9 727 bool do_rr = false;
1da177e4 728
f11e6659
DM		 729 rt0 = fn->rr_ptr;
730 if (!rt0)
731 fn->rr_ptr = rt0 = fn->leaf;
1da177e4 732
afc154e9
HFS		 733 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
734 &do_rr);
1da177e4 735
afc154e9 736 if (do_rr) {
d8d1f30b 737 struct rt6_info *next = rt0->dst.rt6_next;
f11e6659 738
554cfb7e 739 /* no entries matched; do round-robin */
f11e6659
DM		 740 if (!next || next->rt6i_metric != rt0->rt6i_metric)
741 next = fn->leaf;
742
743 if (next != rt0)
744 fn->rr_ptr = next;
1da177e4 745 }
1da177e4 746
d1918542 747 net = dev_net(rt0->dst.dev);
a02cec21 748 return match ? match : net->ipv6.ip6_null_entry;
1da177e4
LT		 749}
750
8b9df265
MKL		 751static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
752{
753 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
754}
755
70ceb4f5
YH		 756#ifdef CONFIG_IPV6_ROUTE_INFO
757int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 758 const struct in6_addr *gwaddr)
70ceb4f5 759{
c346dca1 760 struct net *net = dev_net(dev);
70ceb4f5
YH		 761 struct route_info *rinfo = (struct route_info *) opt;
762 struct in6_addr prefix_buf, *prefix;
763 unsigned int pref;
4bed72e4 764 unsigned long lifetime;
70ceb4f5
YH		 765 struct rt6_info *rt;
766
767 if (len < sizeof(struct route_info)) {
768 return -EINVAL;
769 }
770
771 /* Sanity check for prefix_len and length */
772 if (rinfo->length > 3) {
773 return -EINVAL;
774 } else if (rinfo->prefix_len > 128) {
775 return -EINVAL;
776 } else if (rinfo->prefix_len > 64) {
777 if (rinfo->length < 2) {
778 return -EINVAL;
779 }
780 } else if (rinfo->prefix_len > 0) {
781 if (rinfo->length < 1) {
782 return -EINVAL;
783 }
784 }
785
786 pref = rinfo->route_pref;
787 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 788 return -EINVAL;
70ceb4f5 789
4bed72e4 790 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 791
792 if (rinfo->length == 3)
793 prefix = (struct in6_addr *)rinfo->prefix;
794 else {
795 /* this function is safe */
796 ipv6_addr_prefix(&prefix_buf,
797 (struct in6_addr *)rinfo->prefix,
798 rinfo->prefix_len);
799 prefix = &prefix_buf;
800 }
801
f104a567
DJ		 802 if (rinfo->prefix_len == 0)
803 rt = rt6_get_dflt_router(gwaddr, dev);
804 else
805 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
806 gwaddr, dev->ifindex);
70ceb4f5
YH		 807
808 if (rt && !lifetime) {
e0a1ad73 809 ip6_del_rt(rt);
70ceb4f5
YH		 810 rt = NULL;
811 }
812
813 if (!rt && lifetime)
efa2cea0 814 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
70ceb4f5
YH		 815 pref);
816 else if (rt)
817 rt->rt6i_flags = RTF_ROUTEINFO |
818 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
819
820 if (rt) {
1716a961
G		 821 if (!addrconf_finite_timeout(lifetime))
822 rt6_clean_expires(rt);
823 else
824 rt6_set_expires(rt, jiffies + HZ * lifetime);
825
94e187c0 826 ip6_rt_put(rt);
70ceb4f5
YH		 827 }
828 return 0;
829}
830#endif
831
a3c00e46
MKL		 832static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
833 struct in6_addr *saddr)
834{
835 struct fib6_node *pn;
836 while (1) {
837 if (fn->fn_flags & RTN_TL_ROOT)
838 return NULL;
839 pn = fn->parent;
840 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
841 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
842 else
843 fn = pn;
844 if (fn->fn_flags & RTN_RTINFO)
845 return fn;
846 }
847}
c71099ac 848
8ed67789
DL		 849static struct rt6_info *ip6_pol_route_lookup(struct net *net,
850 struct fib6_table *table,
4c9483b2 851 struct flowi6 *fl6, int flags)
1da177e4
LT		 852{
853 struct fib6_node *fn;
854 struct rt6_info *rt;
855
c71099ac 856 read_lock_bh(&table->tb6_lock);
4c9483b2 857 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac
TG		 858restart:
859 rt = fn->leaf;
4c9483b2 860 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
51ebd318 861 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
52bd4c0c 862 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
a3c00e46
MKL		 863 if (rt == net->ipv6.ip6_null_entry) {
864 fn = fib6_backtrack(fn, &fl6->saddr);
865 if (fn)
866 goto restart;
867 }
d8d1f30b 868 dst_use(&rt->dst, jiffies);
c71099ac 869 read_unlock_bh(&table->tb6_lock);
b811580d
DA		 870
871 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
872
c71099ac
TG		 873 return rt;
874
875}
876
67ba4152 877struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
ea6e574e
FW		 878 int flags)
879{
880 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
881}
882EXPORT_SYMBOL_GPL(ip6_route_lookup);
883
9acd9f3a
YH		 884struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
885 const struct in6_addr *saddr, int oif, int strict)
c71099ac 886{
4c9483b2
DM		 887 struct flowi6 fl6 = {
888 .flowi6_oif = oif,
889 .daddr = *daddr,
c71099ac
TG		 890 };
891 struct dst_entry *dst;
77d16f45 892 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 893
adaa70bb 894 if (saddr) {
4c9483b2 895 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 896 flags |= RT6_LOOKUP_F_HAS_SADDR;
897 }
898
4c9483b2 899 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
c71099ac
TG		 900 if (dst->error == 0)
901 return (struct rt6_info *) dst;
902
903 dst_release(dst);
904
1da177e4
LT		 905 return NULL;
906}
7159039a
YH		 907EXPORT_SYMBOL(rt6_lookup);
908
c71099ac 909/* ip6_ins_rt is called with FREE table->tb6_lock.
1da177e4
LT		 910 It takes new route entry, the addition fails by any reason the
911 route is freed. In any case, if caller does not hold it, it may
912 be destroyed.
913 */
914
e5fd387a 915static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
e715b6d3 916 struct mx6_config *mxc)
1da177e4
LT		 917{
918 int err;
c71099ac 919 struct fib6_table *table;
1da177e4 920
c71099ac
TG		 921 table = rt->rt6i_table;
922 write_lock_bh(&table->tb6_lock);
e715b6d3 923 err = fib6_add(&table->tb6_root, rt, info, mxc);
c71099ac 924 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 925
926 return err;
927}
928
40e22e8f
TG		 929int ip6_ins_rt(struct rt6_info *rt)
930{
e715b6d3
FW		 931 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
932 struct mx6_config mxc = { .mx = NULL, };
933
934 return __ip6_ins_rt(rt, &info, &mxc);
40e22e8f
TG		 935}
936
8b9df265
MKL		 937static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
938 const struct in6_addr *daddr,
939 const struct in6_addr *saddr)
1da177e4 940{
1da177e4
LT		 941 struct rt6_info *rt;
942
943 /*
944 * Clone the route.
945 */
946
d52d3997 947 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
83a09abd 948 ort = (struct rt6_info *)ort->dst.from;
1da177e4 949
ad706862 950 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
83a09abd
MKL		 951
952 if (!rt)
953 return NULL;
954
955 ip6_rt_copy_init(rt, ort);
956 rt->rt6i_flags |= RTF_CACHE;
957 rt->rt6i_metric = 0;
958 rt->dst.flags |= DST_HOST;
959 rt->rt6i_dst.addr = *daddr;
960 rt->rt6i_dst.plen = 128;
1da177e4 961
83a09abd
MKL		 962 if (!rt6_is_gw_or_nonexthop(ort)) {
963 if (ort->rt6i_dst.plen != 128 &&
964 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
965 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 966#ifdef CONFIG_IPV6_SUBTREES
83a09abd
MKL		 967 if (rt->rt6i_src.plen && saddr) {
968 rt->rt6i_src.addr = *saddr;
969 rt->rt6i_src.plen = 128;
8b9df265 970 }
83a09abd 971#endif
95a9a5ba 972 }
1da177e4 973
95a9a5ba
YH		 974 return rt;
975}
1da177e4 976
d52d3997
MKL		 977static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
978{
979 struct rt6_info *pcpu_rt;
980
981 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
ad706862 982 rt->dst.dev, rt->dst.flags);
d52d3997
MKL		 983
984 if (!pcpu_rt)
985 return NULL;
986 ip6_rt_copy_init(pcpu_rt, rt);
987 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
988 pcpu_rt->rt6i_flags |= RTF_PCPU;
989 return pcpu_rt;
990}
991
992/* It should be called with read_lock_bh(&tb6_lock) acquired */
993static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
994{
a73e4195 995 struct rt6_info *pcpu_rt, **p;
d52d3997
MKL		 996
997 p = this_cpu_ptr(rt->rt6i_pcpu);
998 pcpu_rt = *p;
999
a73e4195
MKL		 1000 if (pcpu_rt) {
1001 dst_hold(&pcpu_rt->dst);
1002 rt6_dst_from_metrics_check(pcpu_rt);
1003 }
1004 return pcpu_rt;
1005}
1006
1007static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1008{
9c7370a1 1009 struct fib6_table *table = rt->rt6i_table;
a73e4195 1010 struct rt6_info *pcpu_rt, *prev, **p;
d52d3997
MKL		 1011
1012 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1013 if (!pcpu_rt) {
1014 struct net *net = dev_net(rt->dst.dev);
1015
9c7370a1
MKL		 1016 dst_hold(&net->ipv6.ip6_null_entry->dst);
1017 return net->ipv6.ip6_null_entry;
d52d3997
MKL		 1018 }
1019
9c7370a1
MKL		 1020 read_lock_bh(&table->tb6_lock);
1021 if (rt->rt6i_pcpu) {
1022 p = this_cpu_ptr(rt->rt6i_pcpu);
1023 prev = cmpxchg(p, NULL, pcpu_rt);
1024 if (prev) {
1025 /* If someone did it before us, return prev instead */
1026 dst_destroy(&pcpu_rt->dst);
1027 pcpu_rt = prev;
1028 }
1029 } else {
1030 /* rt has been removed from the fib6 tree
1031 * before we have a chance to acquire the read_lock.
1032 * In this case, don't brother to create a pcpu rt
1033 * since rt is going away anyway. The next
1034 * dst_check() will trigger a re-lookup.
1035 */
d52d3997 1036 dst_destroy(&pcpu_rt->dst);
9c7370a1 1037 pcpu_rt = rt;
d52d3997 1038 }
d52d3997
MKL		 1039 dst_hold(&pcpu_rt->dst);
1040 rt6_dst_from_metrics_check(pcpu_rt);
9c7370a1 1041 read_unlock_bh(&table->tb6_lock);
d52d3997
MKL		 1042 return pcpu_rt;
1043}
1044
9ff74384
DA		 1045struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1046 int oif, struct flowi6 *fl6, int flags)
1da177e4 1047{
367efcb9 1048 struct fib6_node *fn, *saved_fn;
45e4fd26 1049 struct rt6_info *rt;
c71099ac 1050 int strict = 0;
1da177e4 1051
77d16f45 1052 strict |= flags & RT6_LOOKUP_F_IFACE;
367efcb9
MKL		 1053 if (net->ipv6.devconf_all->forwarding == 0)
1054 strict |= RT6_LOOKUP_F_REACHABLE;
1da177e4 1055
c71099ac 1056 read_lock_bh(&table->tb6_lock);
1da177e4 1057
4c9483b2 1058 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 1059 saved_fn = fn;
1da177e4 1060
ca254490
DA		 1061 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1062 oif = 0;
1063
a3c00e46 1064redo_rt6_select:
367efcb9 1065 rt = rt6_select(fn, oif, strict);
52bd4c0c 1066 if (rt->rt6i_nsiblings)
367efcb9 1067 rt = rt6_multipath_select(rt, fl6, oif, strict);
a3c00e46
MKL		 1068 if (rt == net->ipv6.ip6_null_entry) {
1069 fn = fib6_backtrack(fn, &fl6->saddr);
1070 if (fn)
1071 goto redo_rt6_select;
367efcb9
MKL		 1072 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1073 /* also consider unreachable route */
1074 strict &= ~RT6_LOOKUP_F_REACHABLE;
1075 fn = saved_fn;
1076 goto redo_rt6_select;
367efcb9 1077 }
a3c00e46
MKL		 1078 }
1079
fb9de91e 1080
3da59bd9 1081 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
d52d3997
MKL		 1082 dst_use(&rt->dst, jiffies);
1083 read_unlock_bh(&table->tb6_lock);
1084
1085 rt6_dst_from_metrics_check(rt);
b811580d
DA		 1086
1087 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
d52d3997 1088 return rt;
3da59bd9
MKL		 1089 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1090 !(rt->rt6i_flags & RTF_GATEWAY))) {
1091 /* Create a RTF_CACHE clone which will not be
1092 * owned by the fib6 tree. It is for the special case where
1093 * the daddr in the skb during the neighbor look-up is different
1094 * from the fl6->daddr used to look-up route here.
1095 */
1096
1097 struct rt6_info *uncached_rt;
1098
d52d3997
MKL		 1099 dst_use(&rt->dst, jiffies);
1100 read_unlock_bh(&table->tb6_lock);
1101
3da59bd9
MKL		 1102 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1103 dst_release(&rt->dst);
c71099ac 1104
3da59bd9 1105 if (uncached_rt)
8d0b94af 1106 rt6_uncached_list_add(uncached_rt);
3da59bd9
MKL		 1107 else
1108 uncached_rt = net->ipv6.ip6_null_entry;
d52d3997 1109
3da59bd9 1110 dst_hold(&uncached_rt->dst);
b811580d
DA		 1111
1112 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
3da59bd9 1113 return uncached_rt;
3da59bd9 1114
d52d3997
MKL		 1115 } else {
1116 /* Get a percpu copy */
1117
1118 struct rt6_info *pcpu_rt;
1119
1120 rt->dst.lastuse = jiffies;
1121 rt->dst.__use++;
1122 pcpu_rt = rt6_get_pcpu_route(rt);
d52d3997 1123
9c7370a1
MKL		 1124 if (pcpu_rt) {
1125 read_unlock_bh(&table->tb6_lock);
1126 } else {
1127 /* We have to do the read_unlock first
1128 * because rt6_make_pcpu_route() may trigger
1129 * ip6_dst_gc() which will take the write_lock.
1130 */
1131 dst_hold(&rt->dst);
1132 read_unlock_bh(&table->tb6_lock);
a73e4195 1133 pcpu_rt = rt6_make_pcpu_route(rt);
9c7370a1
MKL		 1134 dst_release(&rt->dst);
1135 }
d52d3997 1136
b811580d 1137 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
d52d3997 1138 return pcpu_rt;
9c7370a1 1139
d52d3997 1140 }
1da177e4 1141}
9ff74384 1142EXPORT_SYMBOL_GPL(ip6_pol_route);
1da177e4 1143
8ed67789 1144static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
4c9483b2 1145 struct flowi6 *fl6, int flags)
4acad72d 1146{
4c9483b2 1147 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
4acad72d
PE		 1148}
1149
d409b847
MB		 1150struct dst_entry *ip6_route_input_lookup(struct net *net,
1151 struct net_device *dev,
1152 struct flowi6 *fl6, int flags)
72331bc0
SL		 1153{
1154 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1155 flags |= RT6_LOOKUP_F_IFACE;
1156
1157 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1158}
d409b847 1159EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
72331bc0 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 1167 struct flowi6 fl6 = {
e0d56fdd 1168 .flowi6_iif = skb->dev->ifindex,
4c9483b2
DM		 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
6f21c96a
PA		 1189struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1190 struct flowi6 *fl6, int flags)
c71099ac 1191{
d46a9d67 1192 bool any_src;
c71099ac 1193
4c1feac5
DA		 1194 if (rt6_need_strict(&fl6->daddr)) {
1195 struct dst_entry *dst;
1196
1197 dst = l3mdev_link_scope_lookup(net, fl6);
1198 if (dst)
1199 return dst;
1200 }
ca254490 1201
1fb9489b 1202 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 1203
d46a9d67 1204 any_src = ipv6_addr_any(&fl6->saddr);
741a11d9 1205 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
d46a9d67 1206 (fl6->flowi6_oif && any_src))
77d16f45 1207 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 1208
d46a9d67 1209 if (!any_src)
adaa70bb 1210 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 1211 else if (sk)
1212 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 1213
4c9483b2 1214 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1da177e4 1215}
6f21c96a 1216EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1da177e4 1217
2774c131 1218struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 1219{
5c1e6aa3 1220 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
14e50e57
DM		 1221 struct dst_entry *new = NULL;
1222
f5b0a874 1223 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
14e50e57 1224 if (rt) {
0a1f5962 1225 rt6_info_init(rt);
8104891b 1226
0a1f5962 1227 new = &rt->dst;
14e50e57 1228 new->__use = 1;
352e512c 1229 new->input = dst_discard;
ede2059d 1230 new->output = dst_discard_out;
14e50e57 1231
0a1f5962 1232 dst_copy_metrics(new, &ort->dst);
14e50e57
DM		 1233 rt->rt6i_idev = ort->rt6i_idev;
1234 if (rt->rt6i_idev)
1235 in6_dev_hold(rt->rt6i_idev);
14e50e57 1236
4e3fd7a0 1237 rt->rt6i_gateway = ort->rt6i_gateway;
0a1f5962 1238 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
14e50e57
DM		 1239 rt->rt6i_metric = 0;
1240
1241 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1242#ifdef CONFIG_IPV6_SUBTREES
1243 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1244#endif
1245
1246 dst_free(new);
1247 }
1248
69ead7af
DM		 1249 dst_release(dst_orig);
1250 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 1251}
14e50e57 1252
1da177e4
LT		 1253/*
1254 * Destination cache support functions
1255 */
1256
4b32b5ad
MKL		 1257static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1258{
1259 if (rt->dst.from &&
1260 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1261 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1262}
1263
3da59bd9
MKL		 1264static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1265{
1266 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1267 return NULL;
1268
1269 if (rt6_check_expired(rt))
1270 return NULL;
1271
1272 return &rt->dst;
1273}
1274
1275static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1276{
5973fb1e
MKL		 1277 if (!__rt6_check_expired(rt) &&
1278 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
3da59bd9
MKL		 1279 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1280 return &rt->dst;
1281 else
1282 return NULL;
1283}
1284
1da177e4
LT		 1285static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1286{
1287 struct rt6_info *rt;
1288
1289 rt = (struct rt6_info *) dst;
1290
6f3118b5
ND		 1291 /* All IPV6 dsts are created with ->obsolete set to the value
1292 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1293 * into this function always.
1294 */
e3bc10bd 1295
4b32b5ad
MKL		 1296 rt6_dst_from_metrics_check(rt);
1297
02bcf4e0
MKL		 1298 if (rt->rt6i_flags & RTF_PCPU ||
1299 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
3da59bd9
MKL		 1300 return rt6_dst_from_check(rt, cookie);
1301 else
1302 return rt6_check(rt, cookie);
1da177e4
LT		 1303}
1304
1305static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1306{
1307 struct rt6_info *rt = (struct rt6_info *) dst;
1308
1309 if (rt) {
54c1a859
YH		 1310 if (rt->rt6i_flags & RTF_CACHE) {
1311 if (rt6_check_expired(rt)) {
1312 ip6_del_rt(rt);
1313 dst = NULL;
1314 }
1315 } else {
1da177e4 1316 dst_release(dst);
54c1a859
YH		 1317 dst = NULL;
1318 }
1da177e4 1319 }
54c1a859 1320 return dst;
1da177e4
LT		 1321}
1322
1323static void ip6_link_failure(struct sk_buff *skb)
1324{
1325 struct rt6_info *rt;
1326
3ffe533c 1327 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 1328
adf30907 1329 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 1330 if (rt) {
1eb4f758
HFS		 1331 if (rt->rt6i_flags & RTF_CACHE) {
1332 dst_hold(&rt->dst);
8e3d5be7 1333 ip6_del_rt(rt);
1eb4f758 1334 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1da177e4 1335 rt->rt6i_node->fn_sernum = -1;
1eb4f758 1336 }
1da177e4
LT		 1337 }
1338}
1339
45e4fd26
MKL		 1340static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1341{
1342 struct net *net = dev_net(rt->dst.dev);
1343
1344 rt->rt6i_flags |= RTF_MODIFIED;
1345 rt->rt6i_pmtu = mtu;
1346 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1347}
1348
0d3f6d29
MKL		 1349static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1350{
1351 return !(rt->rt6i_flags & RTF_CACHE) &&
1352 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1353}
1354
45e4fd26
MKL		 1355static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1356 const struct ipv6hdr *iph, u32 mtu)
1da177e4 1357{
67ba4152 1358 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 1359
45e4fd26
MKL		 1360 if (rt6->rt6i_flags & RTF_LOCAL)
1361 return;
81aded24 1362
45e4fd26
MKL		 1363 dst_confirm(dst);
1364 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1365 if (mtu >= dst_mtu(dst))
1366 return;
9d289715 1367
0d3f6d29 1368 if (!rt6_cache_allowed_for_pmtu(rt6)) {
45e4fd26
MKL		 1369 rt6_do_update_pmtu(rt6, mtu);
1370 } else {
1371 const struct in6_addr *daddr, *saddr;
1372 struct rt6_info *nrt6;
1373
1374 if (iph) {
1375 daddr = &iph->daddr;
1376 saddr = &iph->saddr;
1377 } else if (sk) {
1378 daddr = &sk->sk_v6_daddr;
1379 saddr = &inet6_sk(sk)->saddr;
1380 } else {
1381 return;
1382 }
1383 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1384 if (nrt6) {
1385 rt6_do_update_pmtu(nrt6, mtu);
1386
1387 /* ip6_ins_rt(nrt6) will bump the
1388 * rt6->rt6i_node->fn_sernum
1389 * which will fail the next rt6_check() and
1390 * invalidate the sk->sk_dst_cache.
1391 */
1392 ip6_ins_rt(nrt6);
1393 }
1da177e4
LT		 1394 }
1395}
1396
45e4fd26
MKL		 1397static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1398 struct sk_buff *skb, u32 mtu)
1399{
1400 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1401}
1402
42ae66c8
DM		 1403void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1404 int oif, u32 mark)
81aded24
DM		 1405{
1406 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1407 struct dst_entry *dst;
1408 struct flowi6 fl6;
1409
1410 memset(&fl6, 0, sizeof(fl6));
1411 fl6.flowi6_oif = oif;
1b3c61dc 1412 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
81aded24
DM		 1413 fl6.daddr = iph->daddr;
1414 fl6.saddr = iph->saddr;
6502ca52 1415 fl6.flowlabel = ip6_flowinfo(iph);
81aded24
DM		 1416
1417 dst = ip6_route_output(net, NULL, &fl6);
1418 if (!dst->error)
45e4fd26 1419 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
81aded24
DM		 1420 dst_release(dst);
1421}
1422EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1423
1424void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1425{
33c162a9
MKL		 1426 struct dst_entry *dst;
1427
81aded24
DM		 1428 ip6_update_pmtu(skb, sock_net(sk), mtu,
1429 sk->sk_bound_dev_if, sk->sk_mark);
33c162a9
MKL		 1430
1431 dst = __sk_dst_get(sk);
1432 if (!dst || !dst->obsolete ||
1433 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1434 return;
1435
1436 bh_lock_sock(sk);
1437 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1438 ip6_datagram_dst_update(sk, false);
1439 bh_unlock_sock(sk);
81aded24
DM		 1440}
1441EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1442
b55b76b2
DJ		 1443/* Handle redirects */
1444struct ip6rd_flowi {
1445 struct flowi6 fl6;
1446 struct in6_addr gateway;
1447};
1448
1449static struct rt6_info *__ip6_route_redirect(struct net *net,
1450 struct fib6_table *table,
1451 struct flowi6 *fl6,
1452 int flags)
1453{
1454 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1455 struct rt6_info *rt;
1456 struct fib6_node *fn;
1457
1458 /* Get the "current" route for this destination and
1459 * check if the redirect has come from approriate router.
1460 *
1461 * RFC 4861 specifies that redirects should only be
1462 * accepted if they come from the nexthop to the target.
1463 * Due to the way the routes are chosen, this notion
1464 * is a bit fuzzy and one might need to check all possible
1465 * routes.
1466 */
1467
1468 read_lock_bh(&table->tb6_lock);
1469 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1470restart:
1471 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1472 if (rt6_check_expired(rt))
1473 continue;
1474 if (rt->dst.error)
1475 break;
1476 if (!(rt->rt6i_flags & RTF_GATEWAY))
1477 continue;
1478 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1479 continue;
1480 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1481 continue;
1482 break;
1483 }
1484
1485 if (!rt)
1486 rt = net->ipv6.ip6_null_entry;
1487 else if (rt->dst.error) {
1488 rt = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 1489 goto out;
1490 }
1491
1492 if (rt == net->ipv6.ip6_null_entry) {
a3c00e46
MKL		 1493 fn = fib6_backtrack(fn, &fl6->saddr);
1494 if (fn)
1495 goto restart;
b55b76b2 1496 }
a3c00e46 1497
b0a1ba59 1498out:
b55b76b2
DJ		 1499 dst_hold(&rt->dst);
1500
1501 read_unlock_bh(&table->tb6_lock);
1502
b811580d 1503 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
b55b76b2
DJ		 1504 return rt;
1505};
1506
1507static struct dst_entry *ip6_route_redirect(struct net *net,
1508 const struct flowi6 *fl6,
1509 const struct in6_addr *gateway)
1510{
1511 int flags = RT6_LOOKUP_F_HAS_SADDR;
1512 struct ip6rd_flowi rdfl;
1513
1514 rdfl.fl6 = *fl6;
1515 rdfl.gateway = *gateway;
1516
1517 return fib6_rule_lookup(net, &rdfl.fl6,
1518 flags, __ip6_route_redirect);
1519}
1520
3a5ad2ee
DM		 1521void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1522{
1523 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1524 struct dst_entry *dst;
1525 struct flowi6 fl6;
1526
1527 memset(&fl6, 0, sizeof(fl6));
e374c618 1528 fl6.flowi6_iif = LOOPBACK_IFINDEX;
3a5ad2ee
DM		 1529 fl6.flowi6_oif = oif;
1530 fl6.flowi6_mark = mark;
3a5ad2ee
DM		 1531 fl6.daddr = iph->daddr;
1532 fl6.saddr = iph->saddr;
6502ca52 1533 fl6.flowlabel = ip6_flowinfo(iph);
3a5ad2ee 1534
b55b76b2
DJ		 1535 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1536 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 1537 dst_release(dst);
1538}
1539EXPORT_SYMBOL_GPL(ip6_redirect);
1540
c92a59ec
DJ		 1541void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1542 u32 mark)
1543{
1544 const struct ipv6hdr *iph = ipv6_hdr(skb);
1545 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1546 struct dst_entry *dst;
1547 struct flowi6 fl6;
1548
1549 memset(&fl6, 0, sizeof(fl6));
e374c618 1550 fl6.flowi6_iif = LOOPBACK_IFINDEX;
c92a59ec
DJ		 1551 fl6.flowi6_oif = oif;
1552 fl6.flowi6_mark = mark;
c92a59ec
DJ		 1553 fl6.daddr = msg->dest;
1554 fl6.saddr = iph->daddr;
1555
b55b76b2
DJ		 1556 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1557 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 1558 dst_release(dst);
1559}
1560
3a5ad2ee
DM		 1561void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1562{
1563 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1564}
1565EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1566
0dbaee3b 1567static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 1568{
0dbaee3b
DM		 1569 struct net_device *dev = dst->dev;
1570 unsigned int mtu = dst_mtu(dst);
1571 struct net *net = dev_net(dev);
1572
1da177e4
LT		 1573 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1574
5578689a
DL		 1575 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1576 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 1577
1578 /*
1ab1457c
YH		 1579 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1580 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1581 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 1582 * rely only on pmtu discovery"
1583 */
1584 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1585 mtu = IPV6_MAXPLEN;
1586 return mtu;
1587}
1588
ebb762f2 1589static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 1590{
4b32b5ad
MKL		 1591 const struct rt6_info *rt = (const struct rt6_info *)dst;
1592 unsigned int mtu = rt->rt6i_pmtu;
d33e4553 1593 struct inet6_dev *idev;
618f9bc7 1594
4b32b5ad
MKL		 1595 if (mtu)
1596 goto out;
1597
1598 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 1599 if (mtu)
30f78d8e 1600 goto out;
618f9bc7
SK		 1601
1602 mtu = IPV6_MIN_MTU;
d33e4553
DM		 1603
1604 rcu_read_lock();
1605 idev = __in6_dev_get(dst->dev);
1606 if (idev)
1607 mtu = idev->cnf.mtu6;
1608 rcu_read_unlock();
1609
30f78d8e 1610out:
14972cbd
RP		 1611 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1612
1613 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
d33e4553
DM		 1614}
1615
3b00944c
YH		 1616static struct dst_entry *icmp6_dst_gc_list;
1617static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 1618
3b00944c 1619struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 1620 struct flowi6 *fl6)
1da177e4 1621{
87a11578 1622 struct dst_entry *dst;
1da177e4
LT		 1623 struct rt6_info *rt;
1624 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 1625 struct net *net = dev_net(dev);
1da177e4 1626
38308473 1627 if (unlikely(!idev))
122bdf67 1628 return ERR_PTR(-ENODEV);
1da177e4 1629
ad706862 1630 rt = ip6_dst_alloc(net, dev, 0);
38308473 1631 if (unlikely(!rt)) {
1da177e4 1632 in6_dev_put(idev);
87a11578 1633 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 1634 goto out;
1635 }
1636
8e2ec639
YZ		 1637 rt->dst.flags |= DST_HOST;
1638 rt->dst.output = ip6_output;
d8d1f30b 1639 atomic_set(&rt->dst.__refcnt, 1);
550bab42 1640 rt->rt6i_gateway = fl6->daddr;
87a11578 1641 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 1642 rt->rt6i_dst.plen = 128;
1643 rt->rt6i_idev = idev;
14edd87d 1644 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 1645
3b00944c 1646 spin_lock_bh(&icmp6_dst_lock);
d8d1f30b
CG		 1647 rt->dst.next = icmp6_dst_gc_list;
1648 icmp6_dst_gc_list = &rt->dst;
3b00944c 1649 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 1650
5578689a 1651 fib6_force_start_gc(net);
1da177e4 1652
87a11578
DM		 1653 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1654
1da177e4 1655out:
87a11578 1656 return dst;
1da177e4
LT		 1657}
1658
3d0f24a7 1659int icmp6_dst_gc(void)
1da177e4 1660{
e9476e95 1661 struct dst_entry *dst, **pprev;
3d0f24a7 1662 int more = 0;
1da177e4 1663
3b00944c
YH		 1664 spin_lock_bh(&icmp6_dst_lock);
1665 pprev = &icmp6_dst_gc_list;
5d0bbeeb 1666
1da177e4
LT		 1667 while ((dst = *pprev) != NULL) {
1668 if (!atomic_read(&dst->__refcnt)) {
1669 *pprev = dst->next;
1670 dst_free(dst);
1da177e4
LT		 1671 } else {
1672 pprev = &dst->next;
3d0f24a7 1673 ++more;
1da177e4
LT		 1674 }
1675 }
1676
3b00944c 1677 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 1678
3d0f24a7 1679 return more;
1da177e4
LT		 1680}
1681
1e493d19
DM		 1682static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1683 void *arg)
1684{
1685 struct dst_entry *dst, **pprev;
1686
1687 spin_lock_bh(&icmp6_dst_lock);
1688 pprev = &icmp6_dst_gc_list;
1689 while ((dst = *pprev) != NULL) {
1690 struct rt6_info *rt = (struct rt6_info *) dst;
1691 if (func(rt, arg)) {
1692 *pprev = dst->next;
1693 dst_free(dst);
1694 } else {
1695 pprev = &dst->next;
1696 }
1697 }
1698 spin_unlock_bh(&icmp6_dst_lock);
1699}
1700
569d3645 1701static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1702{
86393e52 1703 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 1704 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1705 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1706 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1707 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1708 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 1709 int entries;
7019b78e 1710
fc66f95c 1711 entries = dst_entries_get_fast(ops);
49a18d86 1712 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 1713 entries <= rt_max_size)
1da177e4
LT		 1714 goto out;
1715
6891a346 1716 net->ipv6.ip6_rt_gc_expire++;
14956643 1717 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 1718 entries = dst_entries_get_slow(ops);
1719 if (entries < ops->gc_thresh)
7019b78e 1720 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1721out:
7019b78e 1722 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 1723 return entries > rt_max_size;
1da177e4
LT		 1724}
1725
e715b6d3
FW		 1726static int ip6_convert_metrics(struct mx6_config *mxc,
1727 const struct fib6_config *cfg)
1728{
c3a8d947 1729 bool ecn_ca = false;
e715b6d3
FW		 1730 struct nlattr *nla;
1731 int remaining;
1732 u32 *mp;
1733
63159f29 1734 if (!cfg->fc_mx)
e715b6d3
FW		 1735 return 0;
1736
1737 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1738 if (unlikely(!mp))
1739 return -ENOMEM;
1740
1741 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1742 int type = nla_type(nla);
1bb14807 1743 u32 val;
e715b6d3 1744
1bb14807
DB		 1745 if (!type)
1746 continue;
1747 if (unlikely(type > RTAX_MAX))
1748 goto err;
ea697639 1749
1bb14807
DB		 1750 if (type == RTAX_CC_ALGO) {
1751 char tmp[TCP_CA_NAME_MAX];
e715b6d3 1752
1bb14807 1753 nla_strlcpy(tmp, nla, sizeof(tmp));
c3a8d947 1754 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1bb14807
DB		 1755 if (val == TCP_CA_UNSPEC)
1756 goto err;
1757 } else {
1758 val = nla_get_u32(nla);
e715b6d3 1759 }
626abd59
PA		 1760 if (type == RTAX_HOPLIMIT && val > 255)
1761 val = 255;
b8d3e416
DB		 1762 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1763 goto err;
1bb14807
DB		 1764
1765 mp[type - 1] = val;
1766 __set_bit(type - 1, mxc->mx_valid);
e715b6d3
FW		 1767 }
1768
c3a8d947
DB		 1769 if (ecn_ca) {
1770 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1771 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1772 }
e715b6d3 1773
c3a8d947 1774 mxc->mx = mp;
e715b6d3
FW		 1775 return 0;
1776 err:
1777 kfree(mp);
1778 return -EINVAL;
1779}
1da177e4 1780
8c14586f
DA		 1781static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1782 struct fib6_config *cfg,
1783 const struct in6_addr *gw_addr)
1784{
1785 struct flowi6 fl6 = {
1786 .flowi6_oif = cfg->fc_ifindex,
1787 .daddr = *gw_addr,
1788 .saddr = cfg->fc_prefsrc,
1789 };
1790 struct fib6_table *table;
1791 struct rt6_info *rt;
48f1dcb5 1792 int flags = RT6_LOOKUP_F_IFACE;
8c14586f
DA		 1793
1794 table = fib6_get_table(net, cfg->fc_table);
1795 if (!table)
1796 return NULL;
1797
1798 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1799 flags |= RT6_LOOKUP_F_HAS_SADDR;
1800
1801 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1802
1803 /* if table lookup failed, fall back to full lookup */
1804 if (rt == net->ipv6.ip6_null_entry) {
1805 ip6_rt_put(rt);
1806 rt = NULL;
1807 }
1808
1809 return rt;
1810}
1811
8c5b83f0 1812static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1da177e4 1813{
5578689a 1814 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1815 struct rt6_info *rt = NULL;
1816 struct net_device *dev = NULL;
1817 struct inet6_dev *idev = NULL;
c71099ac 1818 struct fib6_table *table;
1da177e4 1819 int addr_type;
8c5b83f0 1820 int err = -EINVAL;
1da177e4 1821
86872cb5 1822 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
8c5b83f0 1823 goto out;
1da177e4 1824#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1825 if (cfg->fc_src_len)
8c5b83f0 1826 goto out;
1da177e4 1827#endif
86872cb5 1828 if (cfg->fc_ifindex) {
1da177e4 1829 err = -ENODEV;
5578689a 1830 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1831 if (!dev)
1832 goto out;
1833 idev = in6_dev_get(dev);
1834 if (!idev)
1835 goto out;
1836 }
1837
86872cb5
TG		 1838 if (cfg->fc_metric == 0)
1839 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1840
d71314b4 1841 err = -ENOBUFS;
38308473
DM		 1842 if (cfg->fc_nlinfo.nlh &&
1843 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 1844 table = fib6_get_table(net, cfg->fc_table);
38308473 1845 if (!table) {
f3213831 1846 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 1847 table = fib6_new_table(net, cfg->fc_table);
1848 }
1849 } else {
1850 table = fib6_new_table(net, cfg->fc_table);
1851 }
38308473
DM		 1852
1853 if (!table)
c71099ac 1854 goto out;
c71099ac 1855
ad706862
MKL		 1856 rt = ip6_dst_alloc(net, NULL,
1857 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1da177e4 1858
38308473 1859 if (!rt) {
1da177e4
LT		 1860 err = -ENOMEM;
1861 goto out;
1862 }
1863
1716a961
G		 1864 if (cfg->fc_flags & RTF_EXPIRES)
1865 rt6_set_expires(rt, jiffies +
1866 clock_t_to_jiffies(cfg->fc_expires));
1867 else
1868 rt6_clean_expires(rt);
1da177e4 1869
86872cb5
TG		 1870 if (cfg->fc_protocol == RTPROT_UNSPEC)
1871 cfg->fc_protocol = RTPROT_BOOT;
1872 rt->rt6i_protocol = cfg->fc_protocol;
1873
1874 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1875
1876 if (addr_type & IPV6_ADDR_MULTICAST)
d8d1f30b 1877 rt->dst.input = ip6_mc_input;
ab79ad14
MŻ		 1878 else if (cfg->fc_flags & RTF_LOCAL)
1879 rt->dst.input = ip6_input;
1da177e4 1880 else
d8d1f30b 1881 rt->dst.input = ip6_forward;
1da177e4 1882
d8d1f30b 1883 rt->dst.output = ip6_output;
1da177e4 1884
19e42e45
RP		 1885 if (cfg->fc_encap) {
1886 struct lwtunnel_state *lwtstate;
1887
1888 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
127eb7cd
TH		 1889 cfg->fc_encap, AF_INET6, cfg,
1890 &lwtstate);
19e42e45
RP		 1891 if (err)
1892 goto out;
61adedf3
JB		 1893 rt->dst.lwtstate = lwtstate_get(lwtstate);
1894 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1895 rt->dst.lwtstate->orig_output = rt->dst.output;
1896 rt->dst.output = lwtunnel_output;
25368623 1897 }
61adedf3
JB		 1898 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1899 rt->dst.lwtstate->orig_input = rt->dst.input;
1900 rt->dst.input = lwtunnel_input;
25368623 1901 }
19e42e45
RP		 1902 }
1903
86872cb5
TG		 1904 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1905 rt->rt6i_dst.plen = cfg->fc_dst_len;
afc4eef8 1906 if (rt->rt6i_dst.plen == 128)
e5fd387a 1907 rt->dst.flags |= DST_HOST;
e5fd387a 1908
1da177e4 1909#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1910 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1911 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1912#endif
1913
86872cb5 1914 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1915
1916 /* We cannot add true routes via loopback here,
1917 they would result in kernel looping; promote them to reject routes
1918 */
86872cb5 1919 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 1920 (dev && (dev->flags & IFF_LOOPBACK) &&
1921 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1922 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 1923 /* hold loopback dev/idev if we haven't done so. */
5578689a 1924 if (dev != net->loopback_dev) {
1da177e4
LT		 1925 if (dev) {
1926 dev_put(dev);
1927 in6_dev_put(idev);
1928 }
5578689a 1929 dev = net->loopback_dev;
1da177e4
LT		 1930 dev_hold(dev);
1931 idev = in6_dev_get(dev);
1932 if (!idev) {
1933 err = -ENODEV;
1934 goto out;
1935 }
1936 }
1da177e4 1937 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
ef2c7d7b
ND		 1938 switch (cfg->fc_type) {
1939 case RTN_BLACKHOLE:
1940 rt->dst.error = -EINVAL;
ede2059d 1941 rt->dst.output = dst_discard_out;
7150aede 1942 rt->dst.input = dst_discard;
ef2c7d7b
ND		 1943 break;
1944 case RTN_PROHIBIT:
1945 rt->dst.error = -EACCES;
7150aede
K		 1946 rt->dst.output = ip6_pkt_prohibit_out;
1947 rt->dst.input = ip6_pkt_prohibit;
ef2c7d7b 1948 break;
b4949ab2 1949 case RTN_THROW:
0315e382 1950 case RTN_UNREACHABLE:
ef2c7d7b 1951 default:
7150aede 1952 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
0315e382
NF		 1953 : (cfg->fc_type == RTN_UNREACHABLE)
1954 ? -EHOSTUNREACH : -ENETUNREACH;
7150aede
K		 1955 rt->dst.output = ip6_pkt_discard_out;
1956 rt->dst.input = ip6_pkt_discard;
ef2c7d7b
ND		 1957 break;
1958 }
1da177e4
LT		 1959 goto install_route;
1960 }
1961
86872cb5 1962 if (cfg->fc_flags & RTF_GATEWAY) {
b71d1d42 1963 const struct in6_addr *gw_addr;
1da177e4
LT		 1964 int gwa_type;
1965
86872cb5 1966 gw_addr = &cfg->fc_gateway;
330567b7 1967 gwa_type = ipv6_addr_type(gw_addr);
48ed7b26
FW		 1968
1969 /* if gw_addr is local we will fail to detect this in case
1970 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1971 * will return already-added prefix route via interface that
1972 * prefix route was assigned to, which might be non-loopback.
1973 */
1974 err = -EINVAL;
330567b7
FW		 1975 if (ipv6_chk_addr_and_flags(net, gw_addr,
1976 gwa_type & IPV6_ADDR_LINKLOCAL ?
1977 dev : NULL, 0, 0))
48ed7b26
FW		 1978 goto out;
1979
4e3fd7a0 1980 rt->rt6i_gateway = *gw_addr;
1da177e4
LT		 1981
1982 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
8c14586f 1983 struct rt6_info *grt = NULL;
1da177e4
LT		 1984
1985 /* IPv6 strictly inhibits using not link-local
1986 addresses as nexthop address.
1987 Otherwise, router will not able to send redirects.
1988 It is very good, but in some (rare!) circumstances
1989 (SIT, PtP, NBMA NOARP links) it is handy to allow
1990 some exceptions. --ANK
1991 */
38308473 1992 if (!(gwa_type & IPV6_ADDR_UNICAST))
1da177e4
LT		 1993 goto out;
1994
a435a07f 1995 if (cfg->fc_table) {
8c14586f
DA		 1996 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
1997
a435a07f
VB		 1998 if (grt) {
1999 if (grt->rt6i_flags & RTF_GATEWAY ||
2000 (dev && dev != grt->dst.dev)) {
2001 ip6_rt_put(grt);
2002 grt = NULL;
2003 }
2004 }
2005 }
2006
8c14586f
DA		 2007 if (!grt)
2008 grt = rt6_lookup(net, gw_addr, NULL,
2009 cfg->fc_ifindex, 1);
1da177e4
LT		 2010
2011 err = -EHOSTUNREACH;
38308473 2012 if (!grt)
1da177e4
LT		 2013 goto out;
2014 if (dev) {
d1918542 2015 if (dev != grt->dst.dev) {
94e187c0 2016 ip6_rt_put(grt);
1da177e4
LT		 2017 goto out;
2018 }
2019 } else {
d1918542 2020 dev = grt->dst.dev;
1da177e4
LT		 2021 idev = grt->rt6i_idev;
2022 dev_hold(dev);
2023 in6_dev_hold(grt->rt6i_idev);
2024 }
38308473 2025 if (!(grt->rt6i_flags & RTF_GATEWAY))
1da177e4 2026 err = 0;
94e187c0 2027 ip6_rt_put(grt);
1da177e4
LT		 2028
2029 if (err)
2030 goto out;
2031 }
2032 err = -EINVAL;
38308473 2033 if (!dev || (dev->flags & IFF_LOOPBACK))
1da177e4
LT		 2034 goto out;
2035 }
2036
2037 err = -ENODEV;
38308473 2038 if (!dev)
1da177e4
LT		 2039 goto out;
2040
c3968a85
DW		 2041 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2042 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2043 err = -EINVAL;
2044 goto out;
2045 }
4e3fd7a0 2046 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
c3968a85
DW		 2047 rt->rt6i_prefsrc.plen = 128;
2048 } else
2049 rt->rt6i_prefsrc.plen = 0;
2050
86872cb5 2051 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 2052
2053install_route:
d8d1f30b 2054 rt->dst.dev = dev;
1da177e4 2055 rt->rt6i_idev = idev;
c71099ac 2056 rt->rt6i_table = table;
63152fc0 2057
c346dca1 2058 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 2059
8c5b83f0 2060 return rt;
6b9ea5a6
RP		 2061out:
2062 if (dev)
2063 dev_put(dev);
2064 if (idev)
2065 in6_dev_put(idev);
2066 if (rt)
2067 dst_free(&rt->dst);
2068
8c5b83f0 2069 return ERR_PTR(err);
6b9ea5a6
RP		 2070}
2071
2072int ip6_route_add(struct fib6_config *cfg)
2073{
2074 struct mx6_config mxc = { .mx = NULL, };
8c5b83f0 2075 struct rt6_info *rt;
6b9ea5a6
RP		 2076 int err;
2077
8c5b83f0
RP		 2078 rt = ip6_route_info_create(cfg);
2079 if (IS_ERR(rt)) {
2080 err = PTR_ERR(rt);
2081 rt = NULL;
6b9ea5a6 2082 goto out;
8c5b83f0 2083 }
6b9ea5a6 2084
e715b6d3
FW		 2085 err = ip6_convert_metrics(&mxc, cfg);
2086 if (err)
2087 goto out;
1da177e4 2088
e715b6d3
FW		 2089 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2090
2091 kfree(mxc.mx);
6b9ea5a6 2092
e715b6d3 2093 return err;
1da177e4 2094out:
1da177e4 2095 if (rt)
d8d1f30b 2096 dst_free(&rt->dst);
6b9ea5a6 2097
1da177e4
LT		 2098 return err;
2099}
2100
86872cb5 2101static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2102{
2103 int err;
c71099ac 2104 struct fib6_table *table;
d1918542 2105 struct net *net = dev_net(rt->dst.dev);
1da177e4 2106
8e3d5be7
MKL		 2107 if (rt == net->ipv6.ip6_null_entry ||
2108 rt->dst.flags & DST_NOCACHE) {
6825a26c
G		 2109 err = -ENOENT;
2110 goto out;
2111 }
6c813a72 2112
c71099ac
TG		 2113 table = rt->rt6i_table;
2114 write_lock_bh(&table->tb6_lock);
86872cb5 2115 err = fib6_del(rt, info);
c71099ac 2116 write_unlock_bh(&table->tb6_lock);
1da177e4 2117
6825a26c 2118out:
94e187c0 2119 ip6_rt_put(rt);
1da177e4
LT		 2120 return err;
2121}
2122
e0a1ad73
TG		 2123int ip6_del_rt(struct rt6_info *rt)
2124{
4d1169c1 2125 struct nl_info info = {
d1918542 2126 .nl_net = dev_net(rt->dst.dev),
4d1169c1 2127 };
528c4ceb 2128 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 2129}
2130
86872cb5 2131static int ip6_route_del(struct fib6_config *cfg)
1da177e4 2132{
c71099ac 2133 struct fib6_table *table;
1da177e4
LT		 2134 struct fib6_node *fn;
2135 struct rt6_info *rt;
2136 int err = -ESRCH;
2137
5578689a 2138 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
38308473 2139 if (!table)
c71099ac
TG		 2140 return err;
2141
2142 read_lock_bh(&table->tb6_lock);
1da177e4 2143
c71099ac 2144 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 2145 &cfg->fc_dst, cfg->fc_dst_len,
2146 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 2147
1da177e4 2148 if (fn) {
d8d1f30b 2149 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1f56a01f
MKL		 2150 if ((rt->rt6i_flags & RTF_CACHE) &&
2151 !(cfg->fc_flags & RTF_CACHE))
2152 continue;
86872cb5 2153 if (cfg->fc_ifindex &&
d1918542
DM		 2154 (!rt->dst.dev ||
2155 rt->dst.dev->ifindex != cfg->fc_ifindex))
1da177e4 2156 continue;
86872cb5
TG		 2157 if (cfg->fc_flags & RTF_GATEWAY &&
2158 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 2159 continue;
86872cb5 2160 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4 2161 continue;
d8d1f30b 2162 dst_hold(&rt->dst);
c71099ac 2163 read_unlock_bh(&table->tb6_lock);
1da177e4 2164
86872cb5 2165 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 2166 }
2167 }
c71099ac 2168 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2169
2170 return err;
2171}
2172
6700c270 2173static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 2174{
a6279458 2175 struct netevent_redirect netevent;
e8599ff4 2176 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 2177 struct ndisc_options ndopts;
2178 struct inet6_dev *in6_dev;
2179 struct neighbour *neigh;
71bcdba0 2180 struct rd_msg *msg;
6e157b6a
DM		 2181 int optlen, on_link;
2182 u8 *lladdr;
e8599ff4 2183
29a3cad5 2184 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 2185 optlen -= sizeof(*msg);
e8599ff4
DM		 2186
2187 if (optlen < 0) {
6e157b6a 2188 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 2189 return;
2190 }
2191
71bcdba0 2192 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 2193
71bcdba0 2194 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 2195 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 2196 return;
2197 }
2198
6e157b6a 2199 on_link = 0;
71bcdba0 2200 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 2201 on_link = 1;
71bcdba0 2202 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 2203 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 2204 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 2205 return;
2206 }
2207
2208 in6_dev = __in6_dev_get(skb->dev);
2209 if (!in6_dev)
2210 return;
2211 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2212 return;
2213
2214 /* RFC2461 8.1:
2215 * The IP source address of the Redirect MUST be the same as the current
2216 * first-hop router for the specified ICMP Destination Address.
2217 */
2218
f997c55c 2219 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 2220 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2221 return;
2222 }
6e157b6a
DM		 2223
2224 lladdr = NULL;
e8599ff4
DM		 2225 if (ndopts.nd_opts_tgt_lladdr) {
2226 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2227 skb->dev);
2228 if (!lladdr) {
2229 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2230 return;
2231 }
2232 }
2233
6e157b6a 2234 rt = (struct rt6_info *) dst;
ec13ad1d 2235 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 2236 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 2237 return;
6e157b6a 2238 }
e8599ff4 2239
6e157b6a
DM		 2240 /* Redirect received -> path was valid.
2241 * Look, redirects are sent only in response to data packets,
2242 * so that this nexthop apparently is reachable. --ANK
2243 */
2244 dst_confirm(&rt->dst);
a6279458 2245
71bcdba0 2246 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 2247 if (!neigh)
2248 return;
a6279458 2249
1da177e4
LT		 2250 /*
2251 * We have finally decided to accept it.
2252 */
2253
f997c55c 2254 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1da177e4
LT		 2255 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2256 NEIGH_UPDATE_F_OVERRIDE|
2257 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
f997c55c
AA		 2258 NEIGH_UPDATE_F_ISROUTER)),
2259 NDISC_REDIRECT, &ndopts);
1da177e4 2260
83a09abd 2261 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
38308473 2262 if (!nrt)
1da177e4
LT		 2263 goto out;
2264
2265 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2266 if (on_link)
2267 nrt->rt6i_flags &= ~RTF_GATEWAY;
2268
4e3fd7a0 2269 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 2270
40e22e8f 2271 if (ip6_ins_rt(nrt))
1da177e4
LT		 2272 goto out;
2273
d8d1f30b
CG		 2274 netevent.old = &rt->dst;
2275 netevent.new = &nrt->dst;
71bcdba0 2276 netevent.daddr = &msg->dest;
60592833 2277 netevent.neigh = neigh;
8d71740c
TT		 2278 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2279
38308473 2280 if (rt->rt6i_flags & RTF_CACHE) {
6e157b6a 2281 rt = (struct rt6_info *) dst_clone(&rt->dst);
e0a1ad73 2282 ip6_del_rt(rt);
1da177e4
LT		 2283 }
2284
2285out:
e8599ff4 2286 neigh_release(neigh);
6e157b6a
DM		 2287}
2288
1da177e4
LT		 2289/*
2290 * Misc support functions
2291 */
2292
4b32b5ad
MKL		 2293static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2294{
2295 BUG_ON(from->dst.from);
2296
2297 rt->rt6i_flags &= ~RTF_EXPIRES;
2298 dst_hold(&from->dst);
2299 rt->dst.from = &from->dst;
2300 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2301}
2302
83a09abd
MKL		 2303static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2304{
2305 rt->dst.input = ort->dst.input;
2306 rt->dst.output = ort->dst.output;
2307 rt->rt6i_dst = ort->rt6i_dst;
2308 rt->dst.error = ort->dst.error;
2309 rt->rt6i_idev = ort->rt6i_idev;
2310 if (rt->rt6i_idev)
2311 in6_dev_hold(rt->rt6i_idev);
2312 rt->dst.lastuse = jiffies;
2313 rt->rt6i_gateway = ort->rt6i_gateway;
2314 rt->rt6i_flags = ort->rt6i_flags;
2315 rt6_set_from(rt, ort);
2316 rt->rt6i_metric = ort->rt6i_metric;
1da177e4 2317#ifdef CONFIG_IPV6_SUBTREES
83a09abd 2318 rt->rt6i_src = ort->rt6i_src;
1da177e4 2319#endif
83a09abd
MKL		 2320 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2321 rt->rt6i_table = ort->rt6i_table;
61adedf3 2322 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
1da177e4
LT		 2323}
2324
70ceb4f5 2325#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0 2326static struct rt6_info *rt6_get_route_info(struct net *net,
b71d1d42
ED		 2327 const struct in6_addr *prefix, int prefixlen,
2328 const struct in6_addr *gwaddr, int ifindex)
70ceb4f5
YH		 2329{
2330 struct fib6_node *fn;
2331 struct rt6_info *rt = NULL;
c71099ac
TG		 2332 struct fib6_table *table;
2333
efa2cea0 2334 table = fib6_get_table(net, RT6_TABLE_INFO);
38308473 2335 if (!table)
c71099ac 2336 return NULL;
70ceb4f5 2337
5744dd9b 2338 read_lock_bh(&table->tb6_lock);
67ba4152 2339 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
70ceb4f5
YH		 2340 if (!fn)
2341 goto out;
2342
d8d1f30b 2343 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2344 if (rt->dst.dev->ifindex != ifindex)
70ceb4f5
YH		 2345 continue;
2346 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2347 continue;
2348 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2349 continue;
d8d1f30b 2350 dst_hold(&rt->dst);
70ceb4f5
YH		 2351 break;
2352 }
2353out:
5744dd9b 2354 read_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 2355 return rt;
2356}
2357
efa2cea0 2358static struct rt6_info *rt6_add_route_info(struct net *net,
b71d1d42
ED		 2359 const struct in6_addr *prefix, int prefixlen,
2360 const struct in6_addr *gwaddr, int ifindex,
95c96174 2361 unsigned int pref)
70ceb4f5 2362{
86872cb5 2363 struct fib6_config cfg = {
238fc7ea 2364 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2365 .fc_ifindex = ifindex,
2366 .fc_dst_len = prefixlen,
2367 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2368 RTF_UP | RTF_PREF(pref),
15e47304 2369 .fc_nlinfo.portid = 0,
efa2cea0
DL		 2370 .fc_nlinfo.nlh = NULL,
2371 .fc_nlinfo.nl_net = net,
86872cb5
TG		 2372 };
2373
ca254490 2374 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
4e3fd7a0
AD		 2375 cfg.fc_dst = *prefix;
2376 cfg.fc_gateway = *gwaddr;
70ceb4f5 2377
e317da96
YH		 2378 /* We should treat it as a default route if prefix length is 0. */
2379 if (!prefixlen)
86872cb5 2380 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 2381
86872cb5 2382 ip6_route_add(&cfg);
70ceb4f5 2383
efa2cea0 2384 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 2385}
2386#endif
2387
b71d1d42 2388struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1ab1457c 2389{
1da177e4 2390 struct rt6_info *rt;
c71099ac 2391 struct fib6_table *table;
1da177e4 2392
c346dca1 2393 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
38308473 2394 if (!table)
c71099ac 2395 return NULL;
1da177e4 2396
5744dd9b 2397 read_lock_bh(&table->tb6_lock);
67ba4152 2398 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2399 if (dev == rt->dst.dev &&
045927ff 2400 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 2401 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2402 break;
2403 }
2404 if (rt)
d8d1f30b 2405 dst_hold(&rt->dst);
5744dd9b 2406 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2407 return rt;
2408}
2409
b71d1d42 2410struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
ebacaaa0
YH		 2411 struct net_device *dev,
2412 unsigned int pref)
1da177e4 2413{
86872cb5 2414 struct fib6_config cfg = {
ca254490 2415 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
238fc7ea 2416 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 2417 .fc_ifindex = dev->ifindex,
2418 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2419 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
15e47304 2420 .fc_nlinfo.portid = 0,
5578689a 2421 .fc_nlinfo.nlh = NULL,
c346dca1 2422 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2423 };
1da177e4 2424
4e3fd7a0 2425 cfg.fc_gateway = *gwaddr;
1da177e4 2426
86872cb5 2427 ip6_route_add(&cfg);
1da177e4 2428
1da177e4
LT		 2429 return rt6_get_dflt_router(gwaddr, dev);
2430}
2431
7b4da532 2432void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 2433{
2434 struct rt6_info *rt;
c71099ac
TG		 2435 struct fib6_table *table;
2436
2437 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 2438 table = fib6_get_table(net, RT6_TABLE_DFLT);
38308473 2439 if (!table)
c71099ac 2440 return;
1da177e4
LT		 2441
2442restart:
c71099ac 2443 read_lock_bh(&table->tb6_lock);
d8d1f30b 2444 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
3e8b0ac3
LC		 2445 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2446 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
d8d1f30b 2447 dst_hold(&rt->dst);
c71099ac 2448 read_unlock_bh(&table->tb6_lock);
e0a1ad73 2449 ip6_del_rt(rt);
1da177e4
LT		 2450 goto restart;
2451 }
2452 }
c71099ac 2453 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 2454}
2455
5578689a
DL		 2456static void rtmsg_to_fib6_config(struct net *net,
2457 struct in6_rtmsg *rtmsg,
86872cb5
TG		 2458 struct fib6_config *cfg)
2459{
2460 memset(cfg, 0, sizeof(*cfg));
2461
ca254490
DA		 2462 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2463 : RT6_TABLE_MAIN;
86872cb5
TG		 2464 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2465 cfg->fc_metric = rtmsg->rtmsg_metric;
2466 cfg->fc_expires = rtmsg->rtmsg_info;
2467 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2468 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2469 cfg->fc_flags = rtmsg->rtmsg_flags;
2470
5578689a 2471 cfg->fc_nlinfo.nl_net = net;
f1243c2d 2472
4e3fd7a0
AD		 2473 cfg->fc_dst = rtmsg->rtmsg_dst;
2474 cfg->fc_src = rtmsg->rtmsg_src;
2475 cfg->fc_gateway = rtmsg->rtmsg_gateway;
86872cb5
TG		 2476}
2477
5578689a 2478int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 2479{
86872cb5 2480 struct fib6_config cfg;
1da177e4
LT		 2481 struct in6_rtmsg rtmsg;
2482 int err;
2483
67ba4152 2484 switch (cmd) {
1da177e4
LT		 2485 case SIOCADDRT: /* Add a route */
2486 case SIOCDELRT: /* Delete a route */
af31f412 2487 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2488 return -EPERM;
2489 err = copy_from_user(&rtmsg, arg,
2490 sizeof(struct in6_rtmsg));
2491 if (err)
2492 return -EFAULT;
86872cb5 2493
5578689a 2494 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 2495
1da177e4
LT		 2496 rtnl_lock();
2497 switch (cmd) {
2498 case SIOCADDRT:
86872cb5 2499 err = ip6_route_add(&cfg);
1da177e4
LT		 2500 break;
2501 case SIOCDELRT:
86872cb5 2502 err = ip6_route_del(&cfg);
1da177e4
LT		 2503 break;
2504 default:
2505 err = -EINVAL;
2506 }
2507 rtnl_unlock();
2508
2509 return err;
3ff50b79 2510 }
1da177e4
LT		 2511
2512 return -EINVAL;
2513}
2514
2515/*
2516 * Drop the packet on the floor
2517 */
2518
d5fdd6ba 2519static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 2520{
612f09e8 2521 int type;
adf30907 2522 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 2523 switch (ipstats_mib_noroutes) {
2524 case IPSTATS_MIB_INNOROUTES:
0660e03f 2525 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 2526 if (type == IPV6_ADDR_ANY) {
3bd653c8
DL		 2527 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2528 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 2529 break;
2530 }
2531 /* FALLTHROUGH */
2532 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 2533 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2534 ipstats_mib_noroutes);
612f09e8
YH		 2535 break;
2536 }
3ffe533c 2537 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 2538 kfree_skb(skb);
2539 return 0;
2540}
2541
9ce8ade0
TG		 2542static int ip6_pkt_discard(struct sk_buff *skb)
2543{
612f09e8 2544 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2545}
2546
ede2059d 2547static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 2548{
adf30907 2549 skb->dev = skb_dst(skb)->dev;
612f09e8 2550 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 2551}
2552
9ce8ade0
TG		 2553static int ip6_pkt_prohibit(struct sk_buff *skb)
2554{
612f09e8 2555 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 2556}
2557
ede2059d 2558static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 2559{
adf30907 2560 skb->dev = skb_dst(skb)->dev;
612f09e8 2561 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 2562}
2563
1da177e4
LT		 2564/*
2565 * Allocate a dst for local (unicast / anycast) address.
2566 */
2567
2568struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2569 const struct in6_addr *addr,
8f031519 2570 bool anycast)
1da177e4 2571{
ca254490 2572 u32 tb_id;
c346dca1 2573 struct net *net = dev_net(idev->dev);
5f02ce24
DA		 2574 struct net_device *dev = net->loopback_dev;
2575 struct rt6_info *rt;
2576
2577 /* use L3 Master device as loopback for host routes if device
2578 * is enslaved and address is not link local or multicast
2579 */
2580 if (!rt6_need_strict(addr))
2581 dev = l3mdev_master_dev_rcu(idev->dev) ? : dev;
2582
2583 rt = ip6_dst_alloc(net, dev, DST_NOCOUNT);
a3300ef4 2584 if (!rt)
1da177e4
LT		 2585 return ERR_PTR(-ENOMEM);
2586
1da177e4
LT		 2587 in6_dev_hold(idev);
2588
11d53b49 2589 rt->dst.flags |= DST_HOST;
d8d1f30b
CG		 2590 rt->dst.input = ip6_input;
2591 rt->dst.output = ip6_output;
1da177e4 2592 rt->rt6i_idev = idev;
1da177e4
LT		 2593
2594 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 2595 if (anycast)
2596 rt->rt6i_flags |= RTF_ANYCAST;
2597 else
1da177e4 2598 rt->rt6i_flags |= RTF_LOCAL;
1da177e4 2599
550bab42 2600 rt->rt6i_gateway = *addr;
4e3fd7a0 2601 rt->rt6i_dst.addr = *addr;
1da177e4 2602 rt->rt6i_dst.plen = 128;
ca254490
DA		 2603 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2604 rt->rt6i_table = fib6_get_table(net, tb_id);
8e3d5be7 2605 rt->dst.flags |= DST_NOCACHE;
1da177e4 2606
d8d1f30b 2607 atomic_set(&rt->dst.__refcnt, 1);
1da177e4
LT		 2608
2609 return rt;
2610}
2611
c3968a85
DW		 2612/* remove deleted ip from prefsrc entries */
2613struct arg_dev_net_ip {
2614 struct net_device *dev;
2615 struct net *net;
2616 struct in6_addr *addr;
2617};
2618
2619static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2620{
2621 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2622 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2623 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2624
d1918542 2625 if (((void *)rt->dst.dev == dev || !dev) &&
c3968a85
DW		 2626 rt != net->ipv6.ip6_null_entry &&
2627 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2628 /* remove prefsrc entry */
2629 rt->rt6i_prefsrc.plen = 0;
2630 }
2631 return 0;
2632}
2633
2634void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2635{
2636 struct net *net = dev_net(ifp->idev->dev);
2637 struct arg_dev_net_ip adni = {
2638 .dev = ifp->idev->dev,
2639 .net = net,
2640 .addr = &ifp->addr,
2641 };
0c3584d5 2642 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 2643}
2644
be7a010d
DJ		 2645#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2646#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2647
2648/* Remove routers and update dst entries when gateway turn into host. */
2649static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2650{
2651 struct in6_addr *gateway = (struct in6_addr *)arg;
2652
2653 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2654 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2655 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2656 return -1;
2657 }
2658 return 0;
2659}
2660
2661void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2662{
2663 fib6_clean_all(net, fib6_clean_tohost, gateway);
2664}
2665
8ed67789
DL		 2666struct arg_dev_net {
2667 struct net_device *dev;
2668 struct net *net;
2669};
2670
1da177e4
LT		 2671static int fib6_ifdown(struct rt6_info *rt, void *arg)
2672{
bc3ef660 2673 const struct arg_dev_net *adn = arg;
2674 const struct net_device *dev = adn->dev;
8ed67789 2675
d1918542 2676 if ((rt->dst.dev == dev || !dev) &&
c159d30c 2677 rt != adn->net->ipv6.ip6_null_entry)
1da177e4 2678 return -1;
c159d30c 2679
1da177e4
LT		 2680 return 0;
2681}
2682
f3db4851 2683void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 2684{
8ed67789
DL		 2685 struct arg_dev_net adn = {
2686 .dev = dev,
2687 .net = net,
2688 };
2689
0c3584d5 2690 fib6_clean_all(net, fib6_ifdown, &adn);
1e493d19 2691 icmp6_clean_all(fib6_ifdown, &adn);
e332bc67
EB		 2692 if (dev)
2693 rt6_uncached_list_flush_dev(net, dev);
1da177e4
LT		 2694}
2695
95c96174 2696struct rt6_mtu_change_arg {
1da177e4 2697 struct net_device *dev;
95c96174 2698 unsigned int mtu;
1da177e4
LT		 2699};
2700
2701static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2702{
2703 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2704 struct inet6_dev *idev;
2705
2706 /* In IPv6 pmtu discovery is not optional,
2707 so that RTAX_MTU lock cannot disable it.
2708 We still use this lock to block changes
2709 caused by addrconf/ndisc.
2710 */
2711
2712 idev = __in6_dev_get(arg->dev);
38308473 2713 if (!idev)
1da177e4
LT		 2714 return 0;
2715
2716 /* For administrative MTU increase, there is no way to discover
2717 IPv6 PMTU increase, so PMTU increase should be updated here.
2718 Since RFC 1981 doesn't include administrative MTU increase
2719 update PMTU increase is a MUST. (i.e. jumbo frame)
2720 */
2721 /*
2722 If new MTU is less than route PMTU, this new MTU will be the
2723 lowest MTU in the path, update the route PMTU to reflect PMTU
2724 decreases; if new MTU is greater than route PMTU, and the
2725 old MTU is the lowest MTU in the path, update the route PMTU
2726 to reflect the increase. In this case if the other nodes' MTU
2727 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2728 PMTU discouvery.
2729 */
d1918542 2730 if (rt->dst.dev == arg->dev &&
4b32b5ad
MKL		 2731 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2732 if (rt->rt6i_flags & RTF_CACHE) {
2733 /* For RTF_CACHE with rt6i_pmtu == 0
2734 * (i.e. a redirected route),
2735 * the metrics of its rt->dst.from has already
2736 * been updated.
2737 */
2738 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2739 rt->rt6i_pmtu = arg->mtu;
2740 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2741 (dst_mtu(&rt->dst) < arg->mtu &&
2742 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2743 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2744 }
566cfd8f 2745 }
1da177e4
LT		 2746 return 0;
2747}
2748
95c96174 2749void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 2750{
c71099ac
TG		 2751 struct rt6_mtu_change_arg arg = {
2752 .dev = dev,
2753 .mtu = mtu,
2754 };
1da177e4 2755
0c3584d5 2756 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 2757}
2758
ef7c79ed 2759static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 2760 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 2761 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 2762 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 2763 [RTA_PRIORITY] = { .type = NLA_U32 },
2764 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 2765 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 2766 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 2767 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2768 [RTA_ENCAP] = { .type = NLA_NESTED },
32bc201e 2769 [RTA_EXPIRES] = { .type = NLA_U32 },
86872cb5
TG		 2770};
2771
2772static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2773 struct fib6_config *cfg)
1da177e4 2774{
86872cb5
TG		 2775 struct rtmsg *rtm;
2776 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 2777 unsigned int pref;
86872cb5 2778 int err;
1da177e4 2779
86872cb5
TG		 2780 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2781 if (err < 0)
2782 goto errout;
1da177e4 2783
86872cb5
TG		 2784 err = -EINVAL;
2785 rtm = nlmsg_data(nlh);
2786 memset(cfg, 0, sizeof(*cfg));
2787
2788 cfg->fc_table = rtm->rtm_table;
2789 cfg->fc_dst_len = rtm->rtm_dst_len;
2790 cfg->fc_src_len = rtm->rtm_src_len;
2791 cfg->fc_flags = RTF_UP;
2792 cfg->fc_protocol = rtm->rtm_protocol;
ef2c7d7b 2793 cfg->fc_type = rtm->rtm_type;
86872cb5 2794
ef2c7d7b
ND		 2795 if (rtm->rtm_type == RTN_UNREACHABLE ||
2796 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 2797 rtm->rtm_type == RTN_PROHIBIT ||
2798 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 2799 cfg->fc_flags |= RTF_REJECT;
2800
ab79ad14
MŻ		 2801 if (rtm->rtm_type == RTN_LOCAL)
2802 cfg->fc_flags |= RTF_LOCAL;
2803
1f56a01f
MKL		 2804 if (rtm->rtm_flags & RTM_F_CLONED)
2805 cfg->fc_flags |= RTF_CACHE;
2806
15e47304 2807 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
86872cb5 2808 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2809 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2810
2811 if (tb[RTA_GATEWAY]) {
67b61f6c 2812 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 2813 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2814 }
86872cb5
TG		 2815
2816 if (tb[RTA_DST]) {
2817 int plen = (rtm->rtm_dst_len + 7) >> 3;
2818
2819 if (nla_len(tb[RTA_DST]) < plen)
2820 goto errout;
2821
2822 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2823 }
86872cb5
TG		 2824
2825 if (tb[RTA_SRC]) {
2826 int plen = (rtm->rtm_src_len + 7) >> 3;
2827
2828 if (nla_len(tb[RTA_SRC]) < plen)
2829 goto errout;
2830
2831 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2832 }
86872cb5 2833
c3968a85 2834 if (tb[RTA_PREFSRC])
67b61f6c 2835 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 2836
86872cb5
TG		 2837 if (tb[RTA_OIF])
2838 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2839
2840 if (tb[RTA_PRIORITY])
2841 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2842
2843 if (tb[RTA_METRICS]) {
2844 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2845 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2846 }
86872cb5
TG		 2847
2848 if (tb[RTA_TABLE])
2849 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2850
51ebd318
ND		 2851 if (tb[RTA_MULTIPATH]) {
2852 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2853 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2854 }
2855
c78ba6d6
LR		 2856 if (tb[RTA_PREF]) {
2857 pref = nla_get_u8(tb[RTA_PREF]);
2858 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2859 pref != ICMPV6_ROUTER_PREF_HIGH)
2860 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2861 cfg->fc_flags |= RTF_PREF(pref);
2862 }
2863
19e42e45
RP		 2864 if (tb[RTA_ENCAP])
2865 cfg->fc_encap = tb[RTA_ENCAP];
2866
2867 if (tb[RTA_ENCAP_TYPE])
2868 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2869
32bc201e
XL		 2870 if (tb[RTA_EXPIRES]) {
2871 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2872
2873 if (addrconf_finite_timeout(timeout)) {
2874 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2875 cfg->fc_flags |= RTF_EXPIRES;
2876 }
2877 }
2878
86872cb5
TG		 2879 err = 0;
2880errout:
2881 return err;
1da177e4
LT		 2882}
2883
6b9ea5a6
RP		 2884struct rt6_nh {
2885 struct rt6_info *rt6_info;
2886 struct fib6_config r_cfg;
2887 struct mx6_config mxc;
2888 struct list_head next;
2889};
2890
2891static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2892{
2893 struct rt6_nh *nh;
2894
2895 list_for_each_entry(nh, rt6_nh_list, next) {
2896 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2897 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2898 nh->r_cfg.fc_ifindex);
2899 }
2900}
2901
2902static int ip6_route_info_append(struct list_head *rt6_nh_list,
2903 struct rt6_info *rt, struct fib6_config *r_cfg)
2904{
2905 struct rt6_nh *nh;
2906 struct rt6_info *rtnh;
2907 int err = -EEXIST;
2908
2909 list_for_each_entry(nh, rt6_nh_list, next) {
2910 /* check if rt6_info already exists */
2911 rtnh = nh->rt6_info;
2912
2913 if (rtnh->dst.dev == rt->dst.dev &&
2914 rtnh->rt6i_idev == rt->rt6i_idev &&
2915 ipv6_addr_equal(&rtnh->rt6i_gateway,
2916 &rt->rt6i_gateway))
2917 return err;
2918 }
2919
2920 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2921 if (!nh)
2922 return -ENOMEM;
2923 nh->rt6_info = rt;
2924 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2925 if (err) {
2926 kfree(nh);
2927 return err;
2928 }
2929 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2930 list_add_tail(&nh->next, rt6_nh_list);
2931
2932 return 0;
2933}
2934
2935static int ip6_route_multipath_add(struct fib6_config *cfg)
51ebd318
ND		 2936{
2937 struct fib6_config r_cfg;
2938 struct rtnexthop *rtnh;
6b9ea5a6
RP		 2939 struct rt6_info *rt;
2940 struct rt6_nh *err_nh;
2941 struct rt6_nh *nh, *nh_safe;
51ebd318
ND		 2942 int remaining;
2943 int attrlen;
6b9ea5a6
RP		 2944 int err = 1;
2945 int nhn = 0;
2946 int replace = (cfg->fc_nlinfo.nlh &&
2947 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2948 LIST_HEAD(rt6_nh_list);
51ebd318 2949
35f1b4e9 2950 remaining = cfg->fc_mp_len;
51ebd318 2951 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 2952
6b9ea5a6
RP		 2953 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2954 * rt6_info structs per nexthop
2955 */
51ebd318
ND		 2956 while (rtnh_ok(rtnh, remaining)) {
2957 memcpy(&r_cfg, cfg, sizeof(*cfg));
2958 if (rtnh->rtnh_ifindex)
2959 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2960
2961 attrlen = rtnh_attrlen(rtnh);
2962 if (attrlen > 0) {
2963 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2964
2965 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2966 if (nla) {
67b61f6c 2967 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 2968 r_cfg.fc_flags |= RTF_GATEWAY;
2969 }
19e42e45
RP		 2970 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2971 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2972 if (nla)
2973 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 2974 }
6b9ea5a6 2975
8c5b83f0
RP		 2976 rt = ip6_route_info_create(&r_cfg);
2977 if (IS_ERR(rt)) {
2978 err = PTR_ERR(rt);
2979 rt = NULL;
6b9ea5a6 2980 goto cleanup;
8c5b83f0 2981 }
6b9ea5a6
RP		 2982
2983 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
51ebd318 2984 if (err) {
6b9ea5a6
RP		 2985 dst_free(&rt->dst);
2986 goto cleanup;
2987 }
2988
2989 rtnh = rtnh_next(rtnh, &remaining);
2990 }
2991
2992 err_nh = NULL;
2993 list_for_each_entry(nh, &rt6_nh_list, next) {
2994 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2995 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2996 nh->rt6_info = NULL;
2997 if (err) {
2998 if (replace && nhn)
2999 ip6_print_replace_route_err(&rt6_nh_list);
3000 err_nh = nh;
3001 goto add_errout;
51ebd318 3002 }
6b9ea5a6 3003
1a72418b 3004 /* Because each route is added like a single route we remove
27596472
MK		 3005 * these flags after the first nexthop: if there is a collision,
3006 * we have already failed to add the first nexthop:
3007 * fib6_add_rt2node() has rejected it; when replacing, old
3008 * nexthops have been replaced by first new, the rest should
3009 * be added to it.
1a72418b 3010 */
27596472
MK		 3011 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
3012 NLM_F_REPLACE);
6b9ea5a6
RP		 3013 nhn++;
3014 }
3015
3016 goto cleanup;
3017
3018add_errout:
3019 /* Delete routes that were already added */
3020 list_for_each_entry(nh, &rt6_nh_list, next) {
3021 if (err_nh == nh)
3022 break;
3023 ip6_route_del(&nh->r_cfg);
3024 }
3025
3026cleanup:
3027 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3028 if (nh->rt6_info)
3029 dst_free(&nh->rt6_info->dst);
52fe51f8 3030 kfree(nh->mxc.mx);
6b9ea5a6
RP		 3031 list_del(&nh->next);
3032 kfree(nh);
3033 }
3034
3035 return err;
3036}
3037
3038static int ip6_route_multipath_del(struct fib6_config *cfg)
3039{
3040 struct fib6_config r_cfg;
3041 struct rtnexthop *rtnh;
3042 int remaining;
3043 int attrlen;
3044 int err = 1, last_err = 0;
3045
3046 remaining = cfg->fc_mp_len;
3047 rtnh = (struct rtnexthop *)cfg->fc_mp;
3048
3049 /* Parse a Multipath Entry */
3050 while (rtnh_ok(rtnh, remaining)) {
3051 memcpy(&r_cfg, cfg, sizeof(*cfg));
3052 if (rtnh->rtnh_ifindex)
3053 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3054
3055 attrlen = rtnh_attrlen(rtnh);
3056 if (attrlen > 0) {
3057 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3058
3059 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3060 if (nla) {
3061 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3062 r_cfg.fc_flags |= RTF_GATEWAY;
3063 }
3064 }
3065 err = ip6_route_del(&r_cfg);
3066 if (err)
3067 last_err = err;
3068
51ebd318
ND		 3069 rtnh = rtnh_next(rtnh, &remaining);
3070 }
3071
3072 return last_err;
3073}
3074
67ba4152 3075static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3076{
86872cb5
TG		 3077 struct fib6_config cfg;
3078 int err;
1da177e4 3079
86872cb5
TG		 3080 err = rtm_to_fib6_config(skb, nlh, &cfg);
3081 if (err < 0)
3082 return err;
3083
51ebd318 3084 if (cfg.fc_mp)
6b9ea5a6 3085 return ip6_route_multipath_del(&cfg);
51ebd318
ND		 3086 else
3087 return ip6_route_del(&cfg);
1da177e4
LT		 3088}
3089
67ba4152 3090static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3091{
86872cb5
TG		 3092 struct fib6_config cfg;
3093 int err;
1da177e4 3094
86872cb5
TG		 3095 err = rtm_to_fib6_config(skb, nlh, &cfg);
3096 if (err < 0)
3097 return err;
3098
51ebd318 3099 if (cfg.fc_mp)
6b9ea5a6 3100 return ip6_route_multipath_add(&cfg);
51ebd318
ND		 3101 else
3102 return ip6_route_add(&cfg);
1da177e4
LT		 3103}
3104
19e42e45 3105static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
339bf98f
TG		 3106{
3107 return NLMSG_ALIGN(sizeof(struct rtmsg))
3108 + nla_total_size(16) /* RTA_SRC */
3109 + nla_total_size(16) /* RTA_DST */
3110 + nla_total_size(16) /* RTA_GATEWAY */
3111 + nla_total_size(16) /* RTA_PREFSRC */
3112 + nla_total_size(4) /* RTA_TABLE */
3113 + nla_total_size(4) /* RTA_IIF */
3114 + nla_total_size(4) /* RTA_OIF */
3115 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 3116 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 3117 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 3118 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 3119 + nla_total_size(1) /* RTA_PREF */
61adedf3 3120 + lwtunnel_get_encap_size(rt->dst.lwtstate);
339bf98f
TG		 3121}
3122
191cd582
BH		 3123static int rt6_fill_node(struct net *net,
3124 struct sk_buff *skb, struct rt6_info *rt,
0d51aa80 3125 struct in6_addr *dst, struct in6_addr *src,
15e47304 3126 int iif, int type, u32 portid, u32 seq,
7bc570c8 3127 int prefix, int nowait, unsigned int flags)
1da177e4 3128{
4b32b5ad 3129 u32 metrics[RTAX_MAX];
1da177e4 3130 struct rtmsg *rtm;
2d7202bf 3131 struct nlmsghdr *nlh;
e3703b3d 3132 long expires;
9e762a4a 3133 u32 table;
1da177e4
LT		 3134
3135 if (prefix) { /* user wants prefix routes only */
3136 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3137 /* success since this is not a prefix route */
3138 return 1;
3139 }
3140 }
3141
15e47304 3142 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 3143 if (!nlh)
26932566 3144 return -EMSGSIZE;
2d7202bf
TG		 3145
3146 rtm = nlmsg_data(nlh);
1da177e4
LT		 3147 rtm->rtm_family = AF_INET6;
3148 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3149 rtm->rtm_src_len = rt->rt6i_src.plen;
3150 rtm->rtm_tos = 0;
c71099ac 3151 if (rt->rt6i_table)
9e762a4a 3152 table = rt->rt6i_table->tb6_id;
c71099ac 3153 else
9e762a4a
PM		 3154 table = RT6_TABLE_UNSPEC;
3155 rtm->rtm_table = table;
c78679e8
DM		 3156 if (nla_put_u32(skb, RTA_TABLE, table))
3157 goto nla_put_failure;
ef2c7d7b
ND		 3158 if (rt->rt6i_flags & RTF_REJECT) {
3159 switch (rt->dst.error) {
3160 case -EINVAL:
3161 rtm->rtm_type = RTN_BLACKHOLE;
3162 break;
3163 case -EACCES:
3164 rtm->rtm_type = RTN_PROHIBIT;
3165 break;
b4949ab2
ND		 3166 case -EAGAIN:
3167 rtm->rtm_type = RTN_THROW;
3168 break;
ef2c7d7b
ND		 3169 default:
3170 rtm->rtm_type = RTN_UNREACHABLE;
3171 break;
3172 }
3173 }
38308473 3174 else if (rt->rt6i_flags & RTF_LOCAL)
ab79ad14 3175 rtm->rtm_type = RTN_LOCAL;
d1918542 3176 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
1da177e4
LT		 3177 rtm->rtm_type = RTN_LOCAL;
3178 else
3179 rtm->rtm_type = RTN_UNICAST;
3180 rtm->rtm_flags = 0;
35103d11 3181 if (!netif_carrier_ok(rt->dst.dev)) {
cea45e20 3182 rtm->rtm_flags |= RTNH_F_LINKDOWN;
35103d11
AG		 3183 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3184 rtm->rtm_flags |= RTNH_F_DEAD;
3185 }
1da177e4
LT		 3186 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3187 rtm->rtm_protocol = rt->rt6i_protocol;
38308473 3188 if (rt->rt6i_flags & RTF_DYNAMIC)
1da177e4 3189 rtm->rtm_protocol = RTPROT_REDIRECT;
f0396f60
DO		 3190 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3191 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3192 rtm->rtm_protocol = RTPROT_RA;
3193 else
3194 rtm->rtm_protocol = RTPROT_KERNEL;
3195 }
1da177e4 3196
38308473 3197 if (rt->rt6i_flags & RTF_CACHE)
1da177e4
LT		 3198 rtm->rtm_flags |= RTM_F_CLONED;
3199
3200 if (dst) {
930345ea 3201 if (nla_put_in6_addr(skb, RTA_DST, dst))
c78679e8 3202 goto nla_put_failure;
1ab1457c 3203 rtm->rtm_dst_len = 128;
1da177e4 3204 } else if (rtm->rtm_dst_len)
930345ea 3205 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
c78679e8 3206 goto nla_put_failure;
1da177e4
LT		 3207#ifdef CONFIG_IPV6_SUBTREES
3208 if (src) {
930345ea 3209 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 3210 goto nla_put_failure;
1ab1457c 3211 rtm->rtm_src_len = 128;
c78679e8 3212 } else if (rtm->rtm_src_len &&
930345ea 3213 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
c78679e8 3214 goto nla_put_failure;
1da177e4 3215#endif
7bc570c8
YH		 3216 if (iif) {
3217#ifdef CONFIG_IPV6_MROUTE
3218 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2cf75070
NA		 3219 int err = ip6mr_get_route(net, skb, rtm, nowait,
3220 portid);
3221
7bc570c8
YH		 3222 if (err <= 0) {
3223 if (!nowait) {
3224 if (err == 0)
3225 return 0;
3226 goto nla_put_failure;
3227 } else {
3228 if (err == -EMSGSIZE)
3229 goto nla_put_failure;
3230 }
3231 }
3232 } else
3233#endif
c78679e8
DM		 3234 if (nla_put_u32(skb, RTA_IIF, iif))
3235 goto nla_put_failure;
7bc570c8 3236 } else if (dst) {
1da177e4 3237 struct in6_addr saddr_buf;
c78679e8 3238 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
930345ea 3239 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3240 goto nla_put_failure;
1da177e4 3241 }
2d7202bf 3242
c3968a85
DW		 3243 if (rt->rt6i_prefsrc.plen) {
3244 struct in6_addr saddr_buf;
4e3fd7a0 3245 saddr_buf = rt->rt6i_prefsrc.addr;
930345ea 3246 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 3247 goto nla_put_failure;
c3968a85
DW		 3248 }
3249
4b32b5ad
MKL		 3250 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3251 if (rt->rt6i_pmtu)
3252 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3253 if (rtnetlink_put_metrics(skb, metrics) < 0)
2d7202bf
TG		 3254 goto nla_put_failure;
3255
dd0cbf29 3256 if (rt->rt6i_flags & RTF_GATEWAY) {
930345ea 3257 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
94f826b8 3258 goto nla_put_failure;
94f826b8 3259 }
2d7202bf 3260
c78679e8
DM		 3261 if (rt->dst.dev &&
3262 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3263 goto nla_put_failure;
3264 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3265 goto nla_put_failure;
8253947e
LW		 3266
3267 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
69cdf8f9 3268
87a50699 3269 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
e3703b3d 3270 goto nla_put_failure;
2d7202bf 3271
c78ba6d6
LR		 3272 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3273 goto nla_put_failure;
3274
61adedf3 3275 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
19e42e45 3276
053c095a
JB		 3277 nlmsg_end(skb, nlh);
3278 return 0;
2d7202bf
TG		 3279
3280nla_put_failure:
26932566
PM		 3281 nlmsg_cancel(skb, nlh);
3282 return -EMSGSIZE;
1da177e4
LT		 3283}
3284
1b43af54 3285int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 3286{
3287 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3288 int prefix;
3289
2d7202bf
TG		 3290 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3291 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 3292 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3293 } else
3294 prefix = 0;
3295
191cd582
BH		 3296 return rt6_fill_node(arg->net,
3297 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
15e47304 3298 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
7bc570c8 3299 prefix, 0, NLM_F_MULTI);
1da177e4
LT		 3300}
3301
67ba4152 3302static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
1da177e4 3303{
3b1e0a65 3304 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 3305 struct nlattr *tb[RTA_MAX+1];
3306 struct rt6_info *rt;
1da177e4 3307 struct sk_buff *skb;
ab364a6f 3308 struct rtmsg *rtm;
4c9483b2 3309 struct flowi6 fl6;
72331bc0 3310 int err, iif = 0, oif = 0;
1da177e4 3311
ab364a6f
TG		 3312 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3313 if (err < 0)
3314 goto errout;
1da177e4 3315
ab364a6f 3316 err = -EINVAL;
4c9483b2 3317 memset(&fl6, 0, sizeof(fl6));
38b7097b
HFS		 3318 rtm = nlmsg_data(nlh);
3319 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
1da177e4 3320
ab364a6f
TG		 3321 if (tb[RTA_SRC]) {
3322 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3323 goto errout;
3324
4e3fd7a0 3325 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 3326 }
3327
3328 if (tb[RTA_DST]) {
3329 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3330 goto errout;
3331
4e3fd7a0 3332 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 3333 }
3334
3335 if (tb[RTA_IIF])
3336 iif = nla_get_u32(tb[RTA_IIF]);
3337
3338 if (tb[RTA_OIF])
72331bc0 3339 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 3340
2e47b291
LC		 3341 if (tb[RTA_MARK])
3342 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3343
1da177e4
LT		 3344 if (iif) {
3345 struct net_device *dev;
72331bc0
SL		 3346 int flags = 0;
3347
5578689a 3348 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 3349 if (!dev) {
3350 err = -ENODEV;
ab364a6f 3351 goto errout;
1da177e4 3352 }
72331bc0
SL		 3353
3354 fl6.flowi6_iif = iif;
3355
3356 if (!ipv6_addr_any(&fl6.saddr))
3357 flags |= RT6_LOOKUP_F_HAS_SADDR;
3358
3359 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3360 flags);
3361 } else {
3362 fl6.flowi6_oif = oif;
3363
3364 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 3365 }
3366
ab364a6f 3367 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 3368 if (!skb) {
94e187c0 3369 ip6_rt_put(rt);
ab364a6f
TG		 3370 err = -ENOBUFS;
3371 goto errout;
3372 }
1da177e4 3373
ab364a6f
TG		 3374 /* Reserve room for dummy headers, this skb can pass
3375 through good chunk of routing engine.
3376 */
459a98ed 3377 skb_reset_mac_header(skb);
ab364a6f 3378 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 3379
d8d1f30b 3380 skb_dst_set(skb, &rt->dst);
1da177e4 3381
4c9483b2 3382 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
15e47304 3383 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
7bc570c8 3384 nlh->nlmsg_seq, 0, 0, 0);
1da177e4 3385 if (err < 0) {
ab364a6f
TG		 3386 kfree_skb(skb);
3387 goto errout;
1da177e4
LT		 3388 }
3389
15e47304 3390 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 3391errout:
1da177e4 3392 return err;
1da177e4
LT		 3393}
3394
37a1d361
RP		 3395void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3396 unsigned int nlm_flags)
1da177e4
LT		 3397{
3398 struct sk_buff *skb;
5578689a 3399 struct net *net = info->nl_net;
528c4ceb
DL		 3400 u32 seq;
3401 int err;
3402
3403 err = -ENOBUFS;
38308473 3404 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 3405
19e42e45 3406 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 3407 if (!skb)
21713ebc
TG		 3408 goto errout;
3409
191cd582 3410 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
37a1d361 3411 event, info->portid, seq, 0, 0, nlm_flags);
26932566
PM		 3412 if (err < 0) {
3413 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3414 WARN_ON(err == -EMSGSIZE);
3415 kfree_skb(skb);
3416 goto errout;
3417 }
15e47304 3418 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 3419 info->nlh, gfp_any());
3420 return;
21713ebc
TG		 3421errout:
3422 if (err < 0)
5578689a 3423 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 3424}
3425
8ed67789 3426static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 3427 unsigned long event, void *ptr)
8ed67789 3428{
351638e7 3429 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 3430 struct net *net = dev_net(dev);
8ed67789
DL		 3431
3432 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
d8d1f30b 3433 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 3434 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3435#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3436 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 3437 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 3438 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789
DL		 3439 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3440#endif
3441 }
3442
3443 return NOTIFY_OK;
3444}
3445
1da177e4
LT		 3446/*
3447 * /proc
3448 */
3449
3450#ifdef CONFIG_PROC_FS
3451
33120b30
AD		 3452static const struct file_operations ipv6_route_proc_fops = {
3453 .owner = THIS_MODULE,
3454 .open = ipv6_route_open,
3455 .read = seq_read,
3456 .llseek = seq_lseek,
8d2ca1d7 3457 .release = seq_release_net,
33120b30
AD		 3458};
3459
1da177e4
LT		 3460static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3461{
69ddb805 3462 struct net *net = (struct net *)seq->private;
1da177e4 3463 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 3464 net->ipv6.rt6_stats->fib_nodes,
3465 net->ipv6.rt6_stats->fib_route_nodes,
3466 net->ipv6.rt6_stats->fib_rt_alloc,
3467 net->ipv6.rt6_stats->fib_rt_entries,
3468 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 3469 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 3470 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 3471
3472 return 0;
3473}
3474
3475static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3476{
de05c557 3477 return single_open_net(inode, file, rt6_stats_seq_show);
69ddb805
DL		 3478}
3479
9a32144e 3480static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 3481 .owner = THIS_MODULE,
3482 .open = rt6_stats_seq_open,
3483 .read = seq_read,
3484 .llseek = seq_lseek,
b6fcbdb4 3485 .release = single_release_net,
1da177e4
LT		 3486};
3487#endif /* CONFIG_PROC_FS */
3488
3489#ifdef CONFIG_SYSCTL
3490
1da177e4 3491static
fe2c6338 3492int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 3493 void __user *buffer, size_t *lenp, loff_t *ppos)
3494{
c486da34
LAG		 3495 struct net *net;
3496 int delay;
3497 if (!write)
1da177e4 3498 return -EINVAL;
c486da34
LAG		 3499
3500 net = (struct net *)ctl->extra1;
3501 delay = net->ipv6.sysctl.flush_delay;
3502 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 3503 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 3504 return 0;
1da177e4
LT		 3505}
3506
fe2c6338 3507struct ctl_table ipv6_route_table_template[] = {
1ab1457c 3508 {
1da177e4 3509 .procname = "flush",
4990509f 3510 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 3511 .maxlen = sizeof(int),
89c8b3a1 3512 .mode = 0200,
6d9f239a 3513 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 3514 },
3515 {
1da177e4 3516 .procname = "gc_thresh",
9a7ec3a9 3517 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 3518 .maxlen = sizeof(int),
3519 .mode = 0644,
6d9f239a 3520 .proc_handler = proc_dointvec,
1da177e4
LT		 3521 },
3522 {
1da177e4 3523 .procname = "max_size",
4990509f 3524 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 3525 .maxlen = sizeof(int),
3526 .mode = 0644,
6d9f239a 3527 .proc_handler = proc_dointvec,
1da177e4
LT		 3528 },
3529 {
1da177e4 3530 .procname = "gc_min_interval",
4990509f 3531 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3532 .maxlen = sizeof(int),
3533 .mode = 0644,
6d9f239a 3534 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3535 },
3536 {
1da177e4 3537 .procname = "gc_timeout",
4990509f 3538 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 3539 .maxlen = sizeof(int),
3540 .mode = 0644,
6d9f239a 3541 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3542 },
3543 {
1da177e4 3544 .procname = "gc_interval",
4990509f 3545 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 3546 .maxlen = sizeof(int),
3547 .mode = 0644,
6d9f239a 3548 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3549 },
3550 {
1da177e4 3551 .procname = "gc_elasticity",
4990509f 3552 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 3553 .maxlen = sizeof(int),
3554 .mode = 0644,
f3d3f616 3555 .proc_handler = proc_dointvec,
1da177e4
LT		 3556 },
3557 {
1da177e4 3558 .procname = "mtu_expires",
4990509f 3559 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 3560 .maxlen = sizeof(int),
3561 .mode = 0644,
6d9f239a 3562 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 3563 },
3564 {
1da177e4 3565 .procname = "min_adv_mss",
4990509f 3566 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 3567 .maxlen = sizeof(int),
3568 .mode = 0644,
f3d3f616 3569 .proc_handler = proc_dointvec,
1da177e4
LT		 3570 },
3571 {
1da177e4 3572 .procname = "gc_min_interval_ms",
4990509f 3573 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 3574 .maxlen = sizeof(int),
3575 .mode = 0644,
6d9f239a 3576 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 3577 },
f8572d8f 3578 { }
1da177e4
LT		 3579};
3580
2c8c1e72 3581struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 3582{
3583 struct ctl_table *table;
3584
3585 table = kmemdup(ipv6_route_table_template,
3586 sizeof(ipv6_route_table_template),
3587 GFP_KERNEL);
5ee09105
YH		 3588
3589 if (table) {
3590 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 3591 table[0].extra1 = net;
86393e52 3592 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 3593 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3594 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3595 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3596 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3597 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3598 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3599 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 3600 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
464dc801
EB		 3601
3602 /* Don't export sysctls to unprivileged users */
3603 if (net->user_ns != &init_user_ns)
3604 table[0].procname = NULL;
5ee09105
YH		 3605 }
3606
760f2d01
DL		 3607 return table;
3608}
1da177e4
LT		 3609#endif
3610
2c8c1e72 3611static int __net_init ip6_route_net_init(struct net *net)
cdb18761 3612{
633d424b 3613 int ret = -ENOMEM;
8ed67789 3614
86393e52
AD		 3615 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3616 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 3617
fc66f95c
ED		 3618 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3619 goto out_ip6_dst_ops;
3620
8ed67789
DL		 3621 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3622 sizeof(*net->ipv6.ip6_null_entry),
3623 GFP_KERNEL);
3624 if (!net->ipv6.ip6_null_entry)
fc66f95c 3625 goto out_ip6_dst_entries;
d8d1f30b 3626 net->ipv6.ip6_null_entry->dst.path =
8ed67789 3627 (struct dst_entry *)net->ipv6.ip6_null_entry;
d8d1f30b 3628 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3629 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3630 ip6_template_metrics, true);
8ed67789
DL		 3631
3632#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3633 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3634 sizeof(*net->ipv6.ip6_prohibit_entry),
3635 GFP_KERNEL);
68fffc67
PZ		 3636 if (!net->ipv6.ip6_prohibit_entry)
3637 goto out_ip6_null_entry;
d8d1f30b 3638 net->ipv6.ip6_prohibit_entry->dst.path =
8ed67789 3639 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
d8d1f30b 3640 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3641 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3642 ip6_template_metrics, true);
8ed67789
DL		 3643
3644 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3645 sizeof(*net->ipv6.ip6_blk_hole_entry),
3646 GFP_KERNEL);
68fffc67
PZ		 3647 if (!net->ipv6.ip6_blk_hole_entry)
3648 goto out_ip6_prohibit_entry;
d8d1f30b 3649 net->ipv6.ip6_blk_hole_entry->dst.path =
8ed67789 3650 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
d8d1f30b 3651 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 3652 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3653 ip6_template_metrics, true);
8ed67789
DL		 3654#endif
3655
b339a47c
PZ		 3656 net->ipv6.sysctl.flush_delay = 0;
3657 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3658 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3659 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3660 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3661 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3662 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3663 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3664
6891a346
BT		 3665 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3666
8ed67789
DL		 3667 ret = 0;
3668out:
3669 return ret;
f2fc6a54 3670
68fffc67
PZ		 3671#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3672out_ip6_prohibit_entry:
3673 kfree(net->ipv6.ip6_prohibit_entry);
3674out_ip6_null_entry:
3675 kfree(net->ipv6.ip6_null_entry);
3676#endif
fc66f95c
ED		 3677out_ip6_dst_entries:
3678 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 3679out_ip6_dst_ops:
f2fc6a54 3680 goto out;
cdb18761
DL		 3681}
3682
2c8c1e72 3683static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 3684{
8ed67789
DL		 3685 kfree(net->ipv6.ip6_null_entry);
3686#ifdef CONFIG_IPV6_MULTIPLE_TABLES
3687 kfree(net->ipv6.ip6_prohibit_entry);
3688 kfree(net->ipv6.ip6_blk_hole_entry);
3689#endif
41bb78b4 3690 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 3691}
3692
d189634e
TG		 3693static int __net_init ip6_route_net_init_late(struct net *net)
3694{
3695#ifdef CONFIG_PROC_FS
d4beaa66
G		 3696 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3697 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
d189634e
TG		 3698#endif
3699 return 0;
3700}
3701
3702static void __net_exit ip6_route_net_exit_late(struct net *net)
3703{
3704#ifdef CONFIG_PROC_FS
ece31ffd
G		 3705 remove_proc_entry("ipv6_route", net->proc_net);
3706 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 3707#endif
3708}
3709
cdb18761
DL		 3710static struct pernet_operations ip6_route_net_ops = {
3711 .init = ip6_route_net_init,
3712 .exit = ip6_route_net_exit,
3713};
3714
c3426b47
DM		 3715static int __net_init ipv6_inetpeer_init(struct net *net)
3716{
3717 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3718
3719 if (!bp)
3720 return -ENOMEM;
3721 inet_peer_base_init(bp);
3722 net->ipv6.peers = bp;
3723 return 0;
3724}
3725
3726static void __net_exit ipv6_inetpeer_exit(struct net *net)
3727{
3728 struct inet_peer_base *bp = net->ipv6.peers;
3729
3730 net->ipv6.peers = NULL;
56a6b248 3731 inetpeer_invalidate_tree(bp);
c3426b47
DM		 3732 kfree(bp);
3733}
3734
2b823f72 3735static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 3736 .init = ipv6_inetpeer_init,
3737 .exit = ipv6_inetpeer_exit,
3738};
3739
d189634e
TG		 3740static struct pernet_operations ip6_route_net_late_ops = {
3741 .init = ip6_route_net_init_late,
3742 .exit = ip6_route_net_exit_late,
3743};
3744
8ed67789
DL		 3745static struct notifier_block ip6_route_dev_notifier = {
3746 .notifier_call = ip6_route_dev_notify,
3747 .priority = 0,
3748};
3749
433d49c3 3750int __init ip6_route_init(void)
1da177e4 3751{
433d49c3 3752 int ret;
8d0b94af 3753 int cpu;
433d49c3 3754
9a7ec3a9
DL		 3755 ret = -ENOMEM;
3756 ip6_dst_ops_template.kmem_cachep =
e5d679f3 3757 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 3758 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 3759 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 3760 goto out;
14e50e57 3761
fc66f95c 3762 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 3763 if (ret)
bdb3289f 3764 goto out_kmem_cache;
bdb3289f 3765
c3426b47
DM		 3766 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3767 if (ret)
e8803b6c 3768 goto out_dst_entries;
2a0c451a 3769
7e52b33b
DM		 3770 ret = register_pernet_subsys(&ip6_route_net_ops);
3771 if (ret)
3772 goto out_register_inetpeer;
c3426b47 3773
5dc121e9
AE		 3774 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3775
8ed67789
DL		 3776 /* Registering of the loopback is done before this portion of code,
3777 * the loopback reference in rt6_info will not be taken, do it
3778 * manually for init_net */
d8d1f30b 3779 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3780 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3781 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 3782 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
8ed67789 3783 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
d8d1f30b 3784 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
8ed67789
DL		 3785 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3786 #endif
e8803b6c 3787 ret = fib6_init();
433d49c3 3788 if (ret)
8ed67789 3789 goto out_register_subsys;
433d49c3 3790
433d49c3
DL		 3791 ret = xfrm6_init();
3792 if (ret)
e8803b6c 3793 goto out_fib6_init;
c35b7e72 3794
433d49c3
DL		 3795 ret = fib6_rules_init();
3796 if (ret)
3797 goto xfrm6_init;
7e5449c2 3798
d189634e
TG		 3799 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3800 if (ret)
3801 goto fib6_rules_init;
3802
433d49c3 3803 ret = -ENOBUFS;
c7ac8679
GR		 3804 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3805 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3806 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
d189634e 3807 goto out_register_late_subsys;
c127ea2c 3808
8ed67789 3809 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 3810 if (ret)
d189634e 3811 goto out_register_late_subsys;
8ed67789 3812
8d0b94af
MKL		 3813 for_each_possible_cpu(cpu) {
3814 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3815
3816 INIT_LIST_HEAD(&ul->head);
3817 spin_lock_init(&ul->lock);
3818 }
3819
433d49c3
DL		 3820out:
3821 return ret;
3822
d189634e
TG		 3823out_register_late_subsys:
3824 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 3825fib6_rules_init:
433d49c3
DL		 3826 fib6_rules_cleanup();
3827xfrm6_init:
433d49c3 3828 xfrm6_fini();
2a0c451a
TG		 3829out_fib6_init:
3830 fib6_gc_cleanup();
8ed67789
DL		 3831out_register_subsys:
3832 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 3833out_register_inetpeer:
3834 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 3835out_dst_entries:
3836 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 3837out_kmem_cache:
f2fc6a54 3838 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 3839 goto out;
1da177e4
LT		 3840}
3841
3842void ip6_route_cleanup(void)
3843{
8ed67789 3844 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 3845 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 3846 fib6_rules_cleanup();
1da177e4 3847 xfrm6_fini();
1da177e4 3848 fib6_gc_cleanup();
c3426b47 3849 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 3850 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 3851 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 3852 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 3853}
Linux 6.x block layer and io_uring tree(s)