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ipv6: fix a dst leak when removing its exception
[linux-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>
35732d01 47#include <linux/jhash.h>
457c4cbc 48#include <net/net_namespace.h>
1da177e4
LT		 49#include <net/snmp.h>
50#include <net/ipv6.h>
51#include <net/ip6_fib.h>
52#include <net/ip6_route.h>
53#include <net/ndisc.h>
54#include <net/addrconf.h>
55#include <net/tcp.h>
56#include <linux/rtnetlink.h>
57#include <net/dst.h>
904af04d 58#include <net/dst_metadata.h>
1da177e4 59#include <net/xfrm.h>
8d71740c 60#include <net/netevent.h>
21713ebc 61#include <net/netlink.h>
51ebd318 62#include <net/nexthop.h>
19e42e45 63#include <net/lwtunnel.h>
904af04d 64#include <net/ip_tunnels.h>
ca254490 65#include <net/l3mdev.h>
eacb9384 66#include <net/ip.h>
7c0f6ba6 67#include <linux/uaccess.h>
1da177e4
LT		 68
69#ifdef CONFIG_SYSCTL
70#include <linux/sysctl.h>
71#endif
72
30d444d3
DA		 73static int ip6_rt_type_to_error(u8 fib6_type);
74
75#define CREATE_TRACE_POINTS
76#include <trace/events/fib6.h>
77EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup);
78#undef CREATE_TRACE_POINTS
79
afc154e9 80enum rt6_nud_state {
7e980569
JB		 81 RT6_NUD_FAIL_HARD = -3,
82 RT6_NUD_FAIL_PROBE = -2,
83 RT6_NUD_FAIL_DO_RR = -1,
afc154e9
HFS		 84 RT6_NUD_SUCCEED = 1
85};
86
1da177e4 87static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
0dbaee3b 88static unsigned int ip6_default_advmss(const struct dst_entry *dst);
ebb762f2 89static unsigned int ip6_mtu(const struct dst_entry *dst);
1da177e4
LT		 90static struct dst_entry *ip6_negative_advice(struct dst_entry *);
91static void ip6_dst_destroy(struct dst_entry *);
92static void ip6_dst_ifdown(struct dst_entry *,
93 struct net_device *dev, int how);
569d3645 94static int ip6_dst_gc(struct dst_ops *ops);
1da177e4
LT		 95
96static int ip6_pkt_discard(struct sk_buff *skb);
ede2059d 97static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
7150aede 98static int ip6_pkt_prohibit(struct sk_buff *skb);
ede2059d 99static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1da177e4 100static void ip6_link_failure(struct sk_buff *skb);
6700c270
DM		 101static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
102 struct sk_buff *skb, u32 mtu);
103static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
104 struct sk_buff *skb);
8d1c802b
DA		 105static int rt6_score_route(struct fib6_info *rt, int oif, int strict);
106static size_t rt6_nlmsg_size(struct fib6_info *rt);
d4ead6b3 107static int rt6_fill_node(struct net *net, struct sk_buff *skb,
8d1c802b 108 struct fib6_info *rt, struct dst_entry *dst,
d4ead6b3 109 struct in6_addr *dest, struct in6_addr *src,
16a16cd3
DA		 110 int iif, int type, u32 portid, u32 seq,
111 unsigned int flags);
8d1c802b 112static struct rt6_info *rt6_find_cached_rt(struct fib6_info *rt,
35732d01
WW		 113 struct in6_addr *daddr,
114 struct in6_addr *saddr);
1da177e4 115
70ceb4f5 116#ifdef CONFIG_IPV6_ROUTE_INFO
8d1c802b 117static struct fib6_info *rt6_add_route_info(struct net *net,
b71d1d42 118 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 119 const struct in6_addr *gwaddr,
120 struct net_device *dev,
95c96174 121 unsigned int pref);
8d1c802b 122static struct fib6_info *rt6_get_route_info(struct net *net,
b71d1d42 123 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 124 const struct in6_addr *gwaddr,
125 struct net_device *dev);
70ceb4f5
YH		 126#endif
127
8d0b94af
MKL		 128struct uncached_list {
129 spinlock_t lock;
130 struct list_head head;
131};
132
133static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
134
510c321b 135void rt6_uncached_list_add(struct rt6_info *rt)
8d0b94af
MKL		 136{
137 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
138
8d0b94af
MKL		 139 rt->rt6i_uncached_list = ul;
140
141 spin_lock_bh(&ul->lock);
142 list_add_tail(&rt->rt6i_uncached, &ul->head);
143 spin_unlock_bh(&ul->lock);
144}
145
510c321b 146void rt6_uncached_list_del(struct rt6_info *rt)
8d0b94af
MKL		 147{
148 if (!list_empty(&rt->rt6i_uncached)) {
149 struct uncached_list *ul = rt->rt6i_uncached_list;
81eb8447 150 struct net *net = dev_net(rt->dst.dev);
8d0b94af
MKL		 151
152 spin_lock_bh(&ul->lock);
153 list_del(&rt->rt6i_uncached);
81eb8447 154 atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache);
8d0b94af
MKL		 155 spin_unlock_bh(&ul->lock);
156 }
157}
158
159static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
160{
161 struct net_device *loopback_dev = net->loopback_dev;
162 int cpu;
163
e332bc67
EB		 164 if (dev == loopback_dev)
165 return;
166
8d0b94af
MKL		 167 for_each_possible_cpu(cpu) {
168 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
169 struct rt6_info *rt;
170
171 spin_lock_bh(&ul->lock);
172 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
173 struct inet6_dev *rt_idev = rt->rt6i_idev;
174 struct net_device *rt_dev = rt->dst.dev;
175
e332bc67 176 if (rt_idev->dev == dev) {
8d0b94af
MKL		 177 rt->rt6i_idev = in6_dev_get(loopback_dev);
178 in6_dev_put(rt_idev);
179 }
180
e332bc67 181 if (rt_dev == dev) {
8d0b94af
MKL		 182 rt->dst.dev = loopback_dev;
183 dev_hold(rt->dst.dev);
184 dev_put(rt_dev);
185 }
186 }
187 spin_unlock_bh(&ul->lock);
188 }
189}
190
f8a1b43b 191static inline const void *choose_neigh_daddr(const struct in6_addr *p,
f894cbf8
DM		 192 struct sk_buff *skb,
193 const void *daddr)
39232973 194{
a7563f34 195 if (!ipv6_addr_any(p))
39232973 196 return (const void *) p;
f894cbf8
DM		 197 else if (skb)
198 return &ipv6_hdr(skb)->daddr;
39232973
DM		 199 return daddr;
200}
201
f8a1b43b
DA		 202struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
203 struct net_device *dev,
204 struct sk_buff *skb,
205 const void *daddr)
d3aaeb38 206{
39232973
DM		 207 struct neighbour *n;
208
f8a1b43b
DA		 209 daddr = choose_neigh_daddr(gw, skb, daddr);
210 n = __ipv6_neigh_lookup(dev, daddr);
f83c7790
DM		 211 if (n)
212 return n;
f8a1b43b
DA		 213 return neigh_create(&nd_tbl, daddr, dev);
214}
215
216static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,
217 struct sk_buff *skb,
218 const void *daddr)
219{
220 const struct rt6_info *rt = container_of(dst, struct rt6_info, dst);
221
222 return ip6_neigh_lookup(&rt->rt6i_gateway, dst->dev, skb, daddr);
f83c7790
DM		 223}
224
63fca65d
JA		 225static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
226{
227 struct net_device *dev = dst->dev;
228 struct rt6_info *rt = (struct rt6_info *)dst;
229
f8a1b43b 230 daddr = choose_neigh_daddr(&rt->rt6i_gateway, NULL, daddr);
63fca65d
JA		 231 if (!daddr)
232 return;
233 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
234 return;
235 if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
236 return;
237 __ipv6_confirm_neigh(dev, daddr);
238}
239
9a7ec3a9 240static struct dst_ops ip6_dst_ops_template = {
1da177e4 241 .family = AF_INET6,
1da177e4
LT		 242 .gc = ip6_dst_gc,
243 .gc_thresh = 1024,
244 .check = ip6_dst_check,
0dbaee3b 245 .default_advmss = ip6_default_advmss,
ebb762f2 246 .mtu = ip6_mtu,
d4ead6b3 247 .cow_metrics = dst_cow_metrics_generic,
1da177e4
LT		 248 .destroy = ip6_dst_destroy,
249 .ifdown = ip6_dst_ifdown,
250 .negative_advice = ip6_negative_advice,
251 .link_failure = ip6_link_failure,
252 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 253 .redirect = rt6_do_redirect,
9f8955cc 254 .local_out = __ip6_local_out,
f8a1b43b 255 .neigh_lookup = ip6_dst_neigh_lookup,
63fca65d 256 .confirm_neigh = ip6_confirm_neigh,
1da177e4
LT		 257};
258
ebb762f2 259static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
ec831ea7 260{
618f9bc7
SK		 261 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
262
263 return mtu ? : dst->dev->mtu;
ec831ea7
RD		 264}
265
6700c270
DM		 266static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
267 struct sk_buff *skb, u32 mtu)
14e50e57
DM		 268{
269}
270
6700c270
DM		 271static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
272 struct sk_buff *skb)
b587ee3b
DM		 273{
274}
275
14e50e57
DM		 276static struct dst_ops ip6_dst_blackhole_ops = {
277 .family = AF_INET6,
14e50e57
DM		 278 .destroy = ip6_dst_destroy,
279 .check = ip6_dst_check,
ebb762f2 280 .mtu = ip6_blackhole_mtu,
214f45c9 281 .default_advmss = ip6_default_advmss,
14e50e57 282 .update_pmtu = ip6_rt_blackhole_update_pmtu,
b587ee3b 283 .redirect = ip6_rt_blackhole_redirect,
0a1f5962 284 .cow_metrics = dst_cow_metrics_generic,
f8a1b43b 285 .neigh_lookup = ip6_dst_neigh_lookup,
14e50e57
DM		 286};
287
62fa8a84 288static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 289 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 290};
291
8d1c802b 292static const struct fib6_info fib6_null_entry_template = {
93c2fb25
DA		 293 .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP),
294 .fib6_protocol = RTPROT_KERNEL,
295 .fib6_metric = ~(u32)0,
296 .fib6_ref = ATOMIC_INIT(1),
421842ed
DA		 297 .fib6_type = RTN_UNREACHABLE,
298 .fib6_metrics = (struct dst_metrics *)&dst_default_metrics,
299};
300
fb0af4c7 301static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 302 .dst = {
303 .__refcnt = ATOMIC_INIT(1),
304 .__use = 1,
2c20cbd7 305 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 306 .error = -ENETUNREACH,
d8d1f30b
CG		 307 .input = ip6_pkt_discard,
308 .output = ip6_pkt_discard_out,
1da177e4
LT		 309 },
310 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
1da177e4
LT		 311};
312
101367c2
TG		 313#ifdef CONFIG_IPV6_MULTIPLE_TABLES
314
fb0af4c7 315static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 316 .dst = {
317 .__refcnt = ATOMIC_INIT(1),
318 .__use = 1,
2c20cbd7 319 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 320 .error = -EACCES,
d8d1f30b
CG		 321 .input = ip6_pkt_prohibit,
322 .output = ip6_pkt_prohibit_out,
101367c2
TG		 323 },
324 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
101367c2
TG		 325};
326
fb0af4c7 327static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 328 .dst = {
329 .__refcnt = ATOMIC_INIT(1),
330 .__use = 1,
2c20cbd7 331 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 332 .error = -EINVAL,
d8d1f30b 333 .input = dst_discard,
ede2059d 334 .output = dst_discard_out,
101367c2
TG		 335 },
336 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
101367c2
TG		 337};
338
339#endif
340
ebfa45f0
MKL		 341static void rt6_info_init(struct rt6_info *rt)
342{
343 struct dst_entry *dst = &rt->dst;
344
345 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
ebfa45f0
MKL		 346 INIT_LIST_HEAD(&rt->rt6i_uncached);
347}
348
1da177e4 349/* allocate dst with ip6_dst_ops */
93531c67
DA		 350struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
351 int flags)
1da177e4 352{
97bab73f 353 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
b2a9c0ed 354 1, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 355
81eb8447 356 if (rt) {
ebfa45f0 357 rt6_info_init(rt);
81eb8447
WW		 358 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
359 }
8104891b 360
cf911662 361 return rt;
1da177e4 362}
9ab179d8 363EXPORT_SYMBOL(ip6_dst_alloc);
d52d3997 364
1da177e4
LT		 365static void ip6_dst_destroy(struct dst_entry *dst)
366{
367 struct rt6_info *rt = (struct rt6_info *)dst;
a68886a6 368 struct fib6_info *from;
8d0b94af 369 struct inet6_dev *idev;
1da177e4 370
1620a336 371 ip_dst_metrics_put(dst);
8d0b94af
MKL		 372 rt6_uncached_list_del(rt);
373
374 idev = rt->rt6i_idev;
38308473 375 if (idev) {
1da177e4
LT		 376 rt->rt6i_idev = NULL;
377 in6_dev_put(idev);
1ab1457c 378 }
1716a961 379
a68886a6
DA		 380 rcu_read_lock();
381 from = rcu_dereference(rt->from);
382 rcu_assign_pointer(rt->from, NULL);
93531c67 383 fib6_info_release(from);
a68886a6 384 rcu_read_unlock();
b3419363
DM		 385}
386
1da177e4
LT		 387static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
388 int how)
389{
390 struct rt6_info *rt = (struct rt6_info *)dst;
391 struct inet6_dev *idev = rt->rt6i_idev;
5a3e55d6 392 struct net_device *loopback_dev =
c346dca1 393 dev_net(dev)->loopback_dev;
1da177e4 394
e5645f51
WW		 395 if (idev && idev->dev != loopback_dev) {
396 struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev);
397 if (loopback_idev) {
398 rt->rt6i_idev = loopback_idev;
399 in6_dev_put(idev);
97cac082 400 }
1da177e4
LT		 401 }
402}
403
5973fb1e
MKL		 404static bool __rt6_check_expired(const struct rt6_info *rt)
405{
406 if (rt->rt6i_flags & RTF_EXPIRES)
407 return time_after(jiffies, rt->dst.expires);
408 else
409 return false;
410}
411
a50feda5 412static bool rt6_check_expired(const struct rt6_info *rt)
1da177e4 413{
a68886a6
DA		 414 struct fib6_info *from;
415
416 from = rcu_dereference(rt->from);
417
1716a961
G		 418 if (rt->rt6i_flags & RTF_EXPIRES) {
419 if (time_after(jiffies, rt->dst.expires))
a50feda5 420 return true;
a68886a6 421 } else if (from) {
1e2ea8ad 422 return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK ||
a68886a6 423 fib6_check_expired(from);
1716a961 424 }
a50feda5 425 return false;
1da177e4
LT		 426}
427
3b290a31
DA		 428struct fib6_info *fib6_multipath_select(const struct net *net,
429 struct fib6_info *match,
430 struct flowi6 *fl6, int oif,
431 const struct sk_buff *skb,
432 int strict)
51ebd318 433{
8d1c802b 434 struct fib6_info *sibling, *next_sibling;
51ebd318 435
b673d6cc
JS		 436 /* We might have already computed the hash for ICMPv6 errors. In such
437 * case it will always be non-zero. Otherwise now is the time to do it.
438 */
439 if (!fl6->mp_hash)
b4bac172 440 fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
b673d6cc 441
5e670d84 442 if (fl6->mp_hash <= atomic_read(&match->fib6_nh.nh_upper_bound))
3d709f69
IS		 443 return match;
444
93c2fb25
DA		 445 list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings,
446 fib6_siblings) {
5e670d84
DA		 447 int nh_upper_bound;
448
449 nh_upper_bound = atomic_read(&sibling->fib6_nh.nh_upper_bound);
450 if (fl6->mp_hash > nh_upper_bound)
3d709f69
IS		 451 continue;
452 if (rt6_score_route(sibling, oif, strict) < 0)
453 break;
454 match = sibling;
455 break;
456 }
457
51ebd318
ND		 458 return match;
459}
460
1da177e4 461/*
66f5d6ce 462 * Route lookup. rcu_read_lock() should be held.
1da177e4
LT		 463 */
464
8d1c802b
DA		 465static inline struct fib6_info *rt6_device_match(struct net *net,
466 struct fib6_info *rt,
b71d1d42 467 const struct in6_addr *saddr,
1da177e4 468 int oif,
d420895e 469 int flags)
1da177e4 470{
8d1c802b 471 struct fib6_info *sprt;
1da177e4 472
5e670d84
DA		 473 if (!oif && ipv6_addr_any(saddr) &&
474 !(rt->fib6_nh.nh_flags & RTNH_F_DEAD))
8067bb8c 475 return rt;
dd3abc4e 476
8fb11a9a 477 for (sprt = rt; sprt; sprt = rcu_dereference(sprt->fib6_next)) {
5e670d84 478 const struct net_device *dev = sprt->fib6_nh.nh_dev;
dd3abc4e 479
5e670d84 480 if (sprt->fib6_nh.nh_flags & RTNH_F_DEAD)
8067bb8c
IS		 481 continue;
482
dd3abc4e 483 if (oif) {
1da177e4
LT		 484 if (dev->ifindex == oif)
485 return sprt;
dd3abc4e
YH		 486 } else {
487 if (ipv6_chk_addr(net, saddr, dev,
488 flags & RT6_LOOKUP_F_IFACE))
489 return sprt;
1da177e4 490 }
dd3abc4e 491 }
1da177e4 492
eea68cd3
DA		 493 if (oif && flags & RT6_LOOKUP_F_IFACE)
494 return net->ipv6.fib6_null_entry;
8067bb8c 495
421842ed 496 return rt->fib6_nh.nh_flags & RTNH_F_DEAD ? net->ipv6.fib6_null_entry : rt;
1da177e4
LT		 497}
498
27097255 499#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 500struct __rt6_probe_work {
501 struct work_struct work;
502 struct in6_addr target;
503 struct net_device *dev;
504};
505
506static void rt6_probe_deferred(struct work_struct *w)
507{
508 struct in6_addr mcaddr;
509 struct __rt6_probe_work *work =
510 container_of(w, struct __rt6_probe_work, work);
511
512 addrconf_addr_solict_mult(&work->target, &mcaddr);
adc176c5 513 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
c2f17e82 514 dev_put(work->dev);
662f5533 515 kfree(work);
c2f17e82
HFS		 516}
517
8d1c802b 518static void rt6_probe(struct fib6_info *rt)
27097255 519{
f547fac6 520 struct __rt6_probe_work *work = NULL;
5e670d84 521 const struct in6_addr *nh_gw;
f2c31e32 522 struct neighbour *neigh;
5e670d84 523 struct net_device *dev;
f547fac6 524 struct inet6_dev *idev;
5e670d84 525
27097255
YH		 526 /*
527 * Okay, this does not seem to be appropriate
528 * for now, however, we need to check if it
529 * is really so; aka Router Reachability Probing.
530 *
531 * Router Reachability Probe MUST be rate-limited
532 * to no more than one per minute.
533 */
93c2fb25 534 if (!rt || !(rt->fib6_flags & RTF_GATEWAY))
7ff74a59 535 return;
5e670d84
DA		 536
537 nh_gw = &rt->fib6_nh.nh_gw;
538 dev = rt->fib6_nh.nh_dev;
2152caea 539 rcu_read_lock_bh();
f547fac6 540 idev = __in6_dev_get(dev);
5e670d84 541 neigh = __ipv6_neigh_lookup_noref(dev, nh_gw);
2152caea 542 if (neigh) {
8d6c31bf
MKL		 543 if (neigh->nud_state & NUD_VALID)
544 goto out;
545
2152caea 546 write_lock(&neigh->lock);
990edb42
MKL		 547 if (!(neigh->nud_state & NUD_VALID) &&
548 time_after(jiffies,
dcd1f572 549 neigh->updated + idev->cnf.rtr_probe_interval)) {
990edb42
MKL		 550 work = kmalloc(sizeof(*work), GFP_ATOMIC);
551 if (work)
552 __neigh_set_probe_once(neigh);
c2f17e82 553 }
2152caea 554 write_unlock(&neigh->lock);
f547fac6
SD		 555 } else if (time_after(jiffies, rt->last_probe +
556 idev->cnf.rtr_probe_interval)) {
990edb42 557 work = kmalloc(sizeof(*work), GFP_ATOMIC);
f2c31e32 558 }
990edb42
MKL		 559
560 if (work) {
f547fac6 561 rt->last_probe = jiffies;
990edb42 562 INIT_WORK(&work->work, rt6_probe_deferred);
5e670d84
DA		 563 work->target = *nh_gw;
564 dev_hold(dev);
565 work->dev = dev;
990edb42
MKL		 566 schedule_work(&work->work);
567 }
568
8d6c31bf 569out:
2152caea 570 rcu_read_unlock_bh();
27097255
YH		 571}
572#else
8d1c802b 573static inline void rt6_probe(struct fib6_info *rt)
27097255 574{
27097255
YH		 575}
576#endif
577
1da177e4 578/*
554cfb7e 579 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 580 */
8d1c802b 581static inline int rt6_check_dev(struct fib6_info *rt, int oif)
554cfb7e 582{
5e670d84
DA		 583 const struct net_device *dev = rt->fib6_nh.nh_dev;
584
161980f4 585 if (!oif || dev->ifindex == oif)
554cfb7e 586 return 2;
161980f4 587 return 0;
554cfb7e 588}
1da177e4 589
8d1c802b 590static inline enum rt6_nud_state rt6_check_neigh(struct fib6_info *rt)
1da177e4 591{
afc154e9 592 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
5e670d84 593 struct neighbour *neigh;
f2c31e32 594
93c2fb25
DA		 595 if (rt->fib6_flags & RTF_NONEXTHOP ||
596 !(rt->fib6_flags & RTF_GATEWAY))
afc154e9 597 return RT6_NUD_SUCCEED;
145a3621
YH		 598
599 rcu_read_lock_bh();
5e670d84
DA		 600 neigh = __ipv6_neigh_lookup_noref(rt->fib6_nh.nh_dev,
601 &rt->fib6_nh.nh_gw);
145a3621
YH		 602 if (neigh) {
603 read_lock(&neigh->lock);
554cfb7e 604 if (neigh->nud_state & NUD_VALID)
afc154e9 605 ret = RT6_NUD_SUCCEED;
398bcbeb 606#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 607 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 608 ret = RT6_NUD_SUCCEED;
7e980569
JB		 609 else
610 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 611#endif
145a3621 612 read_unlock(&neigh->lock);
afc154e9
HFS		 613 } else {
614 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 615 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 616 }
145a3621
YH		 617 rcu_read_unlock_bh();
618
a5a81f0b 619 return ret;
1da177e4
LT		 620}
621
8d1c802b 622static int rt6_score_route(struct fib6_info *rt, int oif, int strict)
1da177e4 623{
a5a81f0b 624 int m;
1ab1457c 625
4d0c5911 626 m = rt6_check_dev(rt, oif);
77d16f45 627 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 628 return RT6_NUD_FAIL_HARD;
ebacaaa0 629#ifdef CONFIG_IPV6_ROUTER_PREF
93c2fb25 630 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->fib6_flags)) << 2;
ebacaaa0 631#endif
afc154e9
HFS		 632 if (strict & RT6_LOOKUP_F_REACHABLE) {
633 int n = rt6_check_neigh(rt);
634 if (n < 0)
635 return n;
636 }
554cfb7e
YH		 637 return m;
638}
639
dcd1f572
DA		 640/* called with rc_read_lock held */
641static inline bool fib6_ignore_linkdown(const struct fib6_info *f6i)
642{
643 const struct net_device *dev = fib6_info_nh_dev(f6i);
644 bool rc = false;
645
646 if (dev) {
647 const struct inet6_dev *idev = __in6_dev_get(dev);
648
649 rc = !!idev->cnf.ignore_routes_with_linkdown;
650 }
651
652 return rc;
653}
654
8d1c802b
DA		 655static struct fib6_info *find_match(struct fib6_info *rt, int oif, int strict,
656 int *mpri, struct fib6_info *match,
afc154e9 657 bool *do_rr)
554cfb7e 658{
f11e6659 659 int m;
afc154e9 660 bool match_do_rr = false;
35103d11 661
5e670d84 662 if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
8067bb8c
IS		 663 goto out;
664
dcd1f572 665 if (fib6_ignore_linkdown(rt) &&
5e670d84 666 rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN &&
d5d32e4b 667 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
35103d11 668 goto out;
f11e6659 669
14895687 670 if (fib6_check_expired(rt))
f11e6659
DM		 671 goto out;
672
673 m = rt6_score_route(rt, oif, strict);
7e980569 674 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 675 match_do_rr = true;
676 m = 0; /* lowest valid score */
7e980569 677 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 678 goto out;
afc154e9
HFS		 679 }
680
681 if (strict & RT6_LOOKUP_F_REACHABLE)
682 rt6_probe(rt);
f11e6659 683
7e980569 684 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 685 if (m > *mpri) {
afc154e9 686 *do_rr = match_do_rr;
f11e6659
DM		 687 *mpri = m;
688 match = rt;
f11e6659 689 }
f11e6659
DM		 690out:
691 return match;
692}
693
8d1c802b
DA		 694static struct fib6_info *find_rr_leaf(struct fib6_node *fn,
695 struct fib6_info *leaf,
696 struct fib6_info *rr_head,
afc154e9
HFS		 697 u32 metric, int oif, int strict,
698 bool *do_rr)
f11e6659 699{
8d1c802b 700 struct fib6_info *rt, *match, *cont;
554cfb7e 701 int mpri = -1;
1da177e4 702
f11e6659 703 match = NULL;
9fbdcfaf 704 cont = NULL;
8fb11a9a 705 for (rt = rr_head; rt; rt = rcu_dereference(rt->fib6_next)) {
93c2fb25 706 if (rt->fib6_metric != metric) {
9fbdcfaf
SK		 707 cont = rt;
708 break;
709 }
710
711 match = find_match(rt, oif, strict, &mpri, match, do_rr);
712 }
713
66f5d6ce 714 for (rt = leaf; rt && rt != rr_head;
8fb11a9a 715 rt = rcu_dereference(rt->fib6_next)) {
93c2fb25 716 if (rt->fib6_metric != metric) {
9fbdcfaf
SK		 717 cont = rt;
718 break;
719 }
720
afc154e9 721 match = find_match(rt, oif, strict, &mpri, match, do_rr);
9fbdcfaf
SK		 722 }
723
724 if (match || !cont)
725 return match;
726
8fb11a9a 727 for (rt = cont; rt; rt = rcu_dereference(rt->fib6_next))
afc154e9 728 match = find_match(rt, oif, strict, &mpri, match, do_rr);
1da177e4 729
f11e6659
DM		 730 return match;
731}
1da177e4 732
8d1c802b 733static struct fib6_info *rt6_select(struct net *net, struct fib6_node *fn,
8d1040e8 734 int oif, int strict)
f11e6659 735{
8d1c802b
DA		 736 struct fib6_info *leaf = rcu_dereference(fn->leaf);
737 struct fib6_info *match, *rt0;
afc154e9 738 bool do_rr = false;
17ecf590 739 int key_plen;
1da177e4 740
421842ed
DA		 741 if (!leaf || leaf == net->ipv6.fib6_null_entry)
742 return net->ipv6.fib6_null_entry;
8d1040e8 743
66f5d6ce 744 rt0 = rcu_dereference(fn->rr_ptr);
f11e6659 745 if (!rt0)
66f5d6ce 746 rt0 = leaf;
1da177e4 747
17ecf590
WW		 748 /* Double check to make sure fn is not an intermediate node
749 * and fn->leaf does not points to its child's leaf
750 * (This might happen if all routes under fn are deleted from
751 * the tree and fib6_repair_tree() is called on the node.)
752 */
93c2fb25 753 key_plen = rt0->fib6_dst.plen;
17ecf590 754#ifdef CONFIG_IPV6_SUBTREES
93c2fb25
DA		 755 if (rt0->fib6_src.plen)
756 key_plen = rt0->fib6_src.plen;
17ecf590
WW		 757#endif
758 if (fn->fn_bit != key_plen)
421842ed 759 return net->ipv6.fib6_null_entry;
17ecf590 760
93c2fb25 761 match = find_rr_leaf(fn, leaf, rt0, rt0->fib6_metric, oif, strict,
afc154e9 762 &do_rr);
1da177e4 763
afc154e9 764 if (do_rr) {
8fb11a9a 765 struct fib6_info *next = rcu_dereference(rt0->fib6_next);
f11e6659 766
554cfb7e 767 /* no entries matched; do round-robin */
93c2fb25 768 if (!next || next->fib6_metric != rt0->fib6_metric)
8d1040e8 769 next = leaf;
f11e6659 770
66f5d6ce 771 if (next != rt0) {
93c2fb25 772 spin_lock_bh(&leaf->fib6_table->tb6_lock);
66f5d6ce 773 /* make sure next is not being deleted from the tree */
93c2fb25 774 if (next->fib6_node)
66f5d6ce 775 rcu_assign_pointer(fn->rr_ptr, next);
93c2fb25 776 spin_unlock_bh(&leaf->fib6_table->tb6_lock);
66f5d6ce 777 }
1da177e4 778 }
1da177e4 779
421842ed 780 return match ? match : net->ipv6.fib6_null_entry;
1da177e4
LT		 781}
782
8d1c802b 783static bool rt6_is_gw_or_nonexthop(const struct fib6_info *rt)
8b9df265 784{
93c2fb25 785 return (rt->fib6_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
8b9df265
MKL		 786}
787
70ceb4f5
YH		 788#ifdef CONFIG_IPV6_ROUTE_INFO
789int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 790 const struct in6_addr *gwaddr)
70ceb4f5 791{
c346dca1 792 struct net *net = dev_net(dev);
70ceb4f5
YH		 793 struct route_info *rinfo = (struct route_info *) opt;
794 struct in6_addr prefix_buf, *prefix;
795 unsigned int pref;
4bed72e4 796 unsigned long lifetime;
8d1c802b 797 struct fib6_info *rt;
70ceb4f5
YH		 798
799 if (len < sizeof(struct route_info)) {
800 return -EINVAL;
801 }
802
803 /* Sanity check for prefix_len and length */
804 if (rinfo->length > 3) {
805 return -EINVAL;
806 } else if (rinfo->prefix_len > 128) {
807 return -EINVAL;
808 } else if (rinfo->prefix_len > 64) {
809 if (rinfo->length < 2) {
810 return -EINVAL;
811 }
812 } else if (rinfo->prefix_len > 0) {
813 if (rinfo->length < 1) {
814 return -EINVAL;
815 }
816 }
817
818 pref = rinfo->route_pref;
819 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 820 return -EINVAL;
70ceb4f5 821
4bed72e4 822 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 823
824 if (rinfo->length == 3)
825 prefix = (struct in6_addr *)rinfo->prefix;
826 else {
827 /* this function is safe */
828 ipv6_addr_prefix(&prefix_buf,
829 (struct in6_addr *)rinfo->prefix,
830 rinfo->prefix_len);
831 prefix = &prefix_buf;
832 }
833
f104a567 834 if (rinfo->prefix_len == 0)
afb1d4b5 835 rt = rt6_get_dflt_router(net, gwaddr, dev);
f104a567
DJ		 836 else
837 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
830218c1 838 gwaddr, dev);
70ceb4f5
YH		 839
840 if (rt && !lifetime) {
afb1d4b5 841 ip6_del_rt(net, rt);
70ceb4f5
YH		 842 rt = NULL;
843 }
844
845 if (!rt && lifetime)
830218c1
DA		 846 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
847 dev, pref);
70ceb4f5 848 else if (rt)
93c2fb25
DA		 849 rt->fib6_flags = RTF_ROUTEINFO |
850 (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
70ceb4f5
YH		 851
852 if (rt) {
1716a961 853 if (!addrconf_finite_timeout(lifetime))
14895687 854 fib6_clean_expires(rt);
1716a961 855 else
14895687 856 fib6_set_expires(rt, jiffies + HZ * lifetime);
1716a961 857
93531c67 858 fib6_info_release(rt);
70ceb4f5
YH		 859 }
860 return 0;
861}
862#endif
863
ae90d867
DA		 864/*
865 * Misc support functions
866 */
867
868/* called with rcu_lock held */
8d1c802b 869static struct net_device *ip6_rt_get_dev_rcu(struct fib6_info *rt)
ae90d867 870{
5e670d84 871 struct net_device *dev = rt->fib6_nh.nh_dev;
ae90d867 872
93c2fb25 873 if (rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) {
ae90d867
DA		 874 /* for copies of local routes, dst->dev needs to be the
875 * device if it is a master device, the master device if
876 * device is enslaved, and the loopback as the default
877 */
878 if (netif_is_l3_slave(dev) &&
93c2fb25 879 !rt6_need_strict(&rt->fib6_dst.addr))
ae90d867
DA		 880 dev = l3mdev_master_dev_rcu(dev);
881 else if (!netif_is_l3_master(dev))
882 dev = dev_net(dev)->loopback_dev;
883 /* last case is netif_is_l3_master(dev) is true in which
884 * case we want dev returned to be dev
885 */
886 }
887
888 return dev;
889}
890
6edb3c96
DA		 891static const int fib6_prop[RTN_MAX + 1] = {
892 [RTN_UNSPEC] = 0,
893 [RTN_UNICAST] = 0,
894 [RTN_LOCAL] = 0,
895 [RTN_BROADCAST] = 0,
896 [RTN_ANYCAST] = 0,
897 [RTN_MULTICAST] = 0,
898 [RTN_BLACKHOLE] = -EINVAL,
899 [RTN_UNREACHABLE] = -EHOSTUNREACH,
900 [RTN_PROHIBIT] = -EACCES,
901 [RTN_THROW] = -EAGAIN,
902 [RTN_NAT] = -EINVAL,
903 [RTN_XRESOLVE] = -EINVAL,
904};
905
906static int ip6_rt_type_to_error(u8 fib6_type)
907{
908 return fib6_prop[fib6_type];
909}
910
8d1c802b 911static unsigned short fib6_info_dst_flags(struct fib6_info *rt)
3b6761d1
DA		 912{
913 unsigned short flags = 0;
914
915 if (rt->dst_nocount)
916 flags |= DST_NOCOUNT;
917 if (rt->dst_nopolicy)
918 flags |= DST_NOPOLICY;
919 if (rt->dst_host)
920 flags |= DST_HOST;
921
922 return flags;
923}
924
8d1c802b 925static void ip6_rt_init_dst_reject(struct rt6_info *rt, struct fib6_info *ort)
6edb3c96
DA		 926{
927 rt->dst.error = ip6_rt_type_to_error(ort->fib6_type);
928
929 switch (ort->fib6_type) {
930 case RTN_BLACKHOLE:
931 rt->dst.output = dst_discard_out;
932 rt->dst.input = dst_discard;
933 break;
934 case RTN_PROHIBIT:
935 rt->dst.output = ip6_pkt_prohibit_out;
936 rt->dst.input = ip6_pkt_prohibit;
937 break;
938 case RTN_THROW:
939 case RTN_UNREACHABLE:
940 default:
941 rt->dst.output = ip6_pkt_discard_out;
942 rt->dst.input = ip6_pkt_discard;
943 break;
944 }
945}
946
8d1c802b 947static void ip6_rt_init_dst(struct rt6_info *rt, struct fib6_info *ort)
6edb3c96 948{
93c2fb25 949 if (ort->fib6_flags & RTF_REJECT) {
6edb3c96
DA		 950 ip6_rt_init_dst_reject(rt, ort);
951 return;
952 }
953
954 rt->dst.error = 0;
955 rt->dst.output = ip6_output;
956
d23c4b63 957 if (ort->fib6_type == RTN_LOCAL || ort->fib6_type == RTN_ANYCAST) {
6edb3c96 958 rt->dst.input = ip6_input;
93c2fb25 959 } else if (ipv6_addr_type(&ort->fib6_dst.addr) & IPV6_ADDR_MULTICAST) {
6edb3c96
DA		 960 rt->dst.input = ip6_mc_input;
961 } else {
962 rt->dst.input = ip6_forward;
963 }
964
965 if (ort->fib6_nh.nh_lwtstate) {
966 rt->dst.lwtstate = lwtstate_get(ort->fib6_nh.nh_lwtstate);
967 lwtunnel_set_redirect(&rt->dst);
968 }
969
970 rt->dst.lastuse = jiffies;
971}
972
e873e4b9 973/* Caller must already hold reference to @from */
8d1c802b 974static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from)
ae90d867 975{
ae90d867 976 rt->rt6i_flags &= ~RTF_EXPIRES;
a68886a6 977 rcu_assign_pointer(rt->from, from);
e1255ed4 978 ip_dst_init_metrics(&rt->dst, from->fib6_metrics);
ae90d867
DA		 979}
980
e873e4b9 981/* Caller must already hold reference to @ort */
8d1c802b 982static void ip6_rt_copy_init(struct rt6_info *rt, struct fib6_info *ort)
ae90d867 983{
dcd1f572
DA		 984 struct net_device *dev = fib6_info_nh_dev(ort);
985
6edb3c96
DA		 986 ip6_rt_init_dst(rt, ort);
987
93c2fb25 988 rt->rt6i_dst = ort->fib6_dst;
dcd1f572 989 rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
5e670d84 990 rt->rt6i_gateway = ort->fib6_nh.nh_gw;
93c2fb25 991 rt->rt6i_flags = ort->fib6_flags;
ae90d867 992 rt6_set_from(rt, ort);
ae90d867 993#ifdef CONFIG_IPV6_SUBTREES
93c2fb25 994 rt->rt6i_src = ort->fib6_src;
ae90d867 995#endif
ae90d867
DA		 996}
997
a3c00e46
MKL		 998static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
999 struct in6_addr *saddr)
1000{
66f5d6ce 1001 struct fib6_node *pn, *sn;
a3c00e46
MKL		 1002 while (1) {
1003 if (fn->fn_flags & RTN_TL_ROOT)
1004 return NULL;
66f5d6ce
WW		 1005 pn = rcu_dereference(fn->parent);
1006 sn = FIB6_SUBTREE(pn);
1007 if (sn && sn != fn)
6454743b 1008 fn = fib6_node_lookup(sn, NULL, saddr);
a3c00e46
MKL		 1009 else
1010 fn = pn;
1011 if (fn->fn_flags & RTN_RTINFO)
1012 return fn;
1013 }
1014}
c71099ac 1015
d3843fe5
WW		 1016static bool ip6_hold_safe(struct net *net, struct rt6_info **prt,
1017 bool null_fallback)
1018{
1019 struct rt6_info *rt = *prt;
1020
1021 if (dst_hold_safe(&rt->dst))
1022 return true;
1023 if (null_fallback) {
1024 rt = net->ipv6.ip6_null_entry;
1025 dst_hold(&rt->dst);
1026 } else {
1027 rt = NULL;
1028 }
1029 *prt = rt;
1030 return false;
1031}
1032
dec9b0e2 1033/* called with rcu_lock held */
8d1c802b 1034static struct rt6_info *ip6_create_rt_rcu(struct fib6_info *rt)
dec9b0e2 1035{
3b6761d1 1036 unsigned short flags = fib6_info_dst_flags(rt);
dec9b0e2
DA		 1037 struct net_device *dev = rt->fib6_nh.nh_dev;
1038 struct rt6_info *nrt;
1039
e873e4b9
WW		 1040 if (!fib6_info_hold_safe(rt))
1041 return NULL;
1042
93531c67 1043 nrt = ip6_dst_alloc(dev_net(dev), dev, flags);
dec9b0e2
DA		 1044 if (nrt)
1045 ip6_rt_copy_init(nrt, rt);
e873e4b9
WW		 1046 else
1047 fib6_info_release(rt);
dec9b0e2
DA		 1048
1049 return nrt;
1050}
1051
8ed67789
DL		 1052static struct rt6_info *ip6_pol_route_lookup(struct net *net,
1053 struct fib6_table *table,
b75cc8f9
DA		 1054 struct flowi6 *fl6,
1055 const struct sk_buff *skb,
1056 int flags)
1da177e4 1057{
8d1c802b 1058 struct fib6_info *f6i;
1da177e4 1059 struct fib6_node *fn;
23fb93a4 1060 struct rt6_info *rt;
1da177e4 1061
b6cdbc85
DA		 1062 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1063 flags &= ~RT6_LOOKUP_F_IFACE;
1064
66f5d6ce 1065 rcu_read_lock();
6454743b 1066 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac 1067restart:
23fb93a4
DA		 1068 f6i = rcu_dereference(fn->leaf);
1069 if (!f6i) {
1070 f6i = net->ipv6.fib6_null_entry;
66f5d6ce 1071 } else {
23fb93a4 1072 f6i = rt6_device_match(net, f6i, &fl6->saddr,
66f5d6ce 1073 fl6->flowi6_oif, flags);
93c2fb25 1074 if (f6i->fib6_nsiblings && fl6->flowi6_oif == 0)
3b290a31
DA		 1075 f6i = fib6_multipath_select(net, f6i, fl6,
1076 fl6->flowi6_oif, skb,
1077 flags);
66f5d6ce 1078 }
23fb93a4 1079 if (f6i == net->ipv6.fib6_null_entry) {
a3c00e46
MKL		 1080 fn = fib6_backtrack(fn, &fl6->saddr);
1081 if (fn)
1082 goto restart;
1083 }
2b760fcf 1084
d4bea421 1085 trace_fib6_table_lookup(net, f6i, table, fl6);
d3843fe5 1086
2b760fcf 1087 /* Search through exception table */
23fb93a4
DA		 1088 rt = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr);
1089 if (rt) {
dec9b0e2
DA		 1090 if (ip6_hold_safe(net, &rt, true))
1091 dst_use_noref(&rt->dst, jiffies);
23fb93a4 1092 } else if (f6i == net->ipv6.fib6_null_entry) {
dec9b0e2
DA		 1093 rt = net->ipv6.ip6_null_entry;
1094 dst_hold(&rt->dst);
23fb93a4
DA		 1095 } else {
1096 rt = ip6_create_rt_rcu(f6i);
1097 if (!rt) {
1098 rt = net->ipv6.ip6_null_entry;
1099 dst_hold(&rt->dst);
1100 }
dec9b0e2 1101 }
b811580d 1102
66f5d6ce 1103 rcu_read_unlock();
b811580d 1104
c71099ac 1105 return rt;
c71099ac
TG		 1106}
1107
67ba4152 1108struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
b75cc8f9 1109 const struct sk_buff *skb, int flags)
ea6e574e 1110{
b75cc8f9 1111 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup);
ea6e574e
FW		 1112}
1113EXPORT_SYMBOL_GPL(ip6_route_lookup);
1114
9acd9f3a 1115struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
b75cc8f9
DA		 1116 const struct in6_addr *saddr, int oif,
1117 const struct sk_buff *skb, int strict)
c71099ac 1118{
4c9483b2
DM		 1119 struct flowi6 fl6 = {
1120 .flowi6_oif = oif,
1121 .daddr = *daddr,
c71099ac
TG		 1122 };
1123 struct dst_entry *dst;
77d16f45 1124 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 1125
adaa70bb 1126 if (saddr) {
4c9483b2 1127 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 1128 flags |= RT6_LOOKUP_F_HAS_SADDR;
1129 }
1130
b75cc8f9 1131 dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup);
c71099ac
TG		 1132 if (dst->error == 0)
1133 return (struct rt6_info *) dst;
1134
1135 dst_release(dst);
1136
1da177e4
LT		 1137 return NULL;
1138}
7159039a
YH		 1139EXPORT_SYMBOL(rt6_lookup);
1140
c71099ac 1141/* ip6_ins_rt is called with FREE table->tb6_lock.
1cfb71ee
WW		 1142 * It takes new route entry, the addition fails by any reason the
1143 * route is released.
1144 * Caller must hold dst before calling it.
1da177e4
LT		 1145 */
1146
8d1c802b 1147static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info,
333c4301 1148 struct netlink_ext_ack *extack)
1da177e4
LT		 1149{
1150 int err;
c71099ac 1151 struct fib6_table *table;
1da177e4 1152
93c2fb25 1153 table = rt->fib6_table;
66f5d6ce 1154 spin_lock_bh(&table->tb6_lock);
d4ead6b3 1155 err = fib6_add(&table->tb6_root, rt, info, extack);
66f5d6ce 1156 spin_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1157
1158 return err;
1159}
1160
8d1c802b 1161int ip6_ins_rt(struct net *net, struct fib6_info *rt)
40e22e8f 1162{
afb1d4b5 1163 struct nl_info info = { .nl_net = net, };
e715b6d3 1164
d4ead6b3 1165 return __ip6_ins_rt(rt, &info, NULL);
40e22e8f
TG		 1166}
1167
8d1c802b 1168static struct rt6_info *ip6_rt_cache_alloc(struct fib6_info *ort,
8b9df265
MKL		 1169 const struct in6_addr *daddr,
1170 const struct in6_addr *saddr)
1da177e4 1171{
4832c30d 1172 struct net_device *dev;
1da177e4
LT		 1173 struct rt6_info *rt;
1174
1175 /*
1176 * Clone the route.
1177 */
1178
e873e4b9
WW		 1179 if (!fib6_info_hold_safe(ort))
1180 return NULL;
1181
4832c30d 1182 dev = ip6_rt_get_dev_rcu(ort);
93531c67 1183 rt = ip6_dst_alloc(dev_net(dev), dev, 0);
e873e4b9
WW		 1184 if (!rt) {
1185 fib6_info_release(ort);
83a09abd 1186 return NULL;
e873e4b9 1187 }
83a09abd
MKL		 1188
1189 ip6_rt_copy_init(rt, ort);
1190 rt->rt6i_flags |= RTF_CACHE;
83a09abd
MKL		 1191 rt->dst.flags |= DST_HOST;
1192 rt->rt6i_dst.addr = *daddr;
1193 rt->rt6i_dst.plen = 128;
1da177e4 1194
83a09abd 1195 if (!rt6_is_gw_or_nonexthop(ort)) {
93c2fb25
DA		 1196 if (ort->fib6_dst.plen != 128 &&
1197 ipv6_addr_equal(&ort->fib6_dst.addr, daddr))
83a09abd 1198 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 1199#ifdef CONFIG_IPV6_SUBTREES
83a09abd
MKL		 1200 if (rt->rt6i_src.plen && saddr) {
1201 rt->rt6i_src.addr = *saddr;
1202 rt->rt6i_src.plen = 128;
8b9df265 1203 }
83a09abd 1204#endif
95a9a5ba 1205 }
1da177e4 1206
95a9a5ba
YH		 1207 return rt;
1208}
1da177e4 1209
8d1c802b 1210static struct rt6_info *ip6_rt_pcpu_alloc(struct fib6_info *rt)
d52d3997 1211{
3b6761d1 1212 unsigned short flags = fib6_info_dst_flags(rt);
4832c30d 1213 struct net_device *dev;
d52d3997
MKL		 1214 struct rt6_info *pcpu_rt;
1215
e873e4b9
WW		 1216 if (!fib6_info_hold_safe(rt))
1217 return NULL;
1218
4832c30d
DA		 1219 rcu_read_lock();
1220 dev = ip6_rt_get_dev_rcu(rt);
93531c67 1221 pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags);
4832c30d 1222 rcu_read_unlock();
e873e4b9
WW		 1223 if (!pcpu_rt) {
1224 fib6_info_release(rt);
d52d3997 1225 return NULL;
e873e4b9 1226 }
d52d3997 1227 ip6_rt_copy_init(pcpu_rt, rt);
d52d3997
MKL		 1228 pcpu_rt->rt6i_flags |= RTF_PCPU;
1229 return pcpu_rt;
1230}
1231
66f5d6ce 1232/* It should be called with rcu_read_lock() acquired */
8d1c802b 1233static struct rt6_info *rt6_get_pcpu_route(struct fib6_info *rt)
d52d3997 1234{
a73e4195 1235 struct rt6_info *pcpu_rt, **p;
d52d3997
MKL		 1236
1237 p = this_cpu_ptr(rt->rt6i_pcpu);
1238 pcpu_rt = *p;
1239
d4ead6b3
DA		 1240 if (pcpu_rt)
1241 ip6_hold_safe(NULL, &pcpu_rt, false);
d3843fe5 1242
a73e4195
MKL		 1243 return pcpu_rt;
1244}
1245
afb1d4b5 1246static struct rt6_info *rt6_make_pcpu_route(struct net *net,
8d1c802b 1247 struct fib6_info *rt)
a73e4195
MKL		 1248{
1249 struct rt6_info *pcpu_rt, *prev, **p;
d52d3997
MKL		 1250
1251 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1252 if (!pcpu_rt) {
9c7370a1
MKL		 1253 dst_hold(&net->ipv6.ip6_null_entry->dst);
1254 return net->ipv6.ip6_null_entry;
d52d3997
MKL		 1255 }
1256
a94b9367
WW		 1257 dst_hold(&pcpu_rt->dst);
1258 p = this_cpu_ptr(rt->rt6i_pcpu);
1259 prev = cmpxchg(p, NULL, pcpu_rt);
951f788a 1260 BUG_ON(prev);
a94b9367 1261
d52d3997
MKL		 1262 return pcpu_rt;
1263}
1264
35732d01
WW		 1265/* exception hash table implementation
1266 */
1267static DEFINE_SPINLOCK(rt6_exception_lock);
1268
1269/* Remove rt6_ex from hash table and free the memory
1270 * Caller must hold rt6_exception_lock
1271 */
1272static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
1273 struct rt6_exception *rt6_ex)
1274{
b2427e67 1275 struct net *net;
81eb8447 1276
35732d01
WW		 1277 if (!bucket || !rt6_ex)
1278 return;
b2427e67
CIK		 1279
1280 net = dev_net(rt6_ex->rt6i->dst.dev);
35732d01 1281 hlist_del_rcu(&rt6_ex->hlist);
77634cc6 1282 dst_release(&rt6_ex->rt6i->dst);
35732d01
WW		 1283 kfree_rcu(rt6_ex, rcu);
1284 WARN_ON_ONCE(!bucket->depth);
1285 bucket->depth--;
81eb8447 1286 net->ipv6.rt6_stats->fib_rt_cache--;
35732d01
WW		 1287}
1288
1289/* Remove oldest rt6_ex in bucket and free the memory
1290 * Caller must hold rt6_exception_lock
1291 */
1292static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket)
1293{
1294 struct rt6_exception *rt6_ex, *oldest = NULL;
1295
1296 if (!bucket)
1297 return;
1298
1299 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
1300 if (!oldest || time_before(rt6_ex->stamp, oldest->stamp))
1301 oldest = rt6_ex;
1302 }
1303 rt6_remove_exception(bucket, oldest);
1304}
1305
1306static u32 rt6_exception_hash(const struct in6_addr *dst,
1307 const struct in6_addr *src)
1308{
1309 static u32 seed __read_mostly;
1310 u32 val;
1311
1312 net_get_random_once(&seed, sizeof(seed));
1313 val = jhash(dst, sizeof(*dst), seed);
1314
1315#ifdef CONFIG_IPV6_SUBTREES
1316 if (src)
1317 val = jhash(src, sizeof(*src), val);
1318#endif
1319 return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
1320}
1321
1322/* Helper function to find the cached rt in the hash table
1323 * and update bucket pointer to point to the bucket for this
1324 * (daddr, saddr) pair
1325 * Caller must hold rt6_exception_lock
1326 */
1327static struct rt6_exception *
1328__rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket,
1329 const struct in6_addr *daddr,
1330 const struct in6_addr *saddr)
1331{
1332 struct rt6_exception *rt6_ex;
1333 u32 hval;
1334
1335 if (!(*bucket) || !daddr)
1336 return NULL;
1337
1338 hval = rt6_exception_hash(daddr, saddr);
1339 *bucket += hval;
1340
1341 hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) {
1342 struct rt6_info *rt6 = rt6_ex->rt6i;
1343 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1344
1345#ifdef CONFIG_IPV6_SUBTREES
1346 if (matched && saddr)
1347 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1348#endif
1349 if (matched)
1350 return rt6_ex;
1351 }
1352 return NULL;
1353}
1354
1355/* Helper function to find the cached rt in the hash table
1356 * and update bucket pointer to point to the bucket for this
1357 * (daddr, saddr) pair
1358 * Caller must hold rcu_read_lock()
1359 */
1360static struct rt6_exception *
1361__rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
1362 const struct in6_addr *daddr,
1363 const struct in6_addr *saddr)
1364{
1365 struct rt6_exception *rt6_ex;
1366 u32 hval;
1367
1368 WARN_ON_ONCE(!rcu_read_lock_held());
1369
1370 if (!(*bucket) || !daddr)
1371 return NULL;
1372
1373 hval = rt6_exception_hash(daddr, saddr);
1374 *bucket += hval;
1375
1376 hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) {
1377 struct rt6_info *rt6 = rt6_ex->rt6i;
1378 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1379
1380#ifdef CONFIG_IPV6_SUBTREES
1381 if (matched && saddr)
1382 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1383#endif
1384 if (matched)
1385 return rt6_ex;
1386 }
1387 return NULL;
1388}
1389
8d1c802b 1390static unsigned int fib6_mtu(const struct fib6_info *rt)
d4ead6b3
DA		 1391{
1392 unsigned int mtu;
1393
dcd1f572
DA		 1394 if (rt->fib6_pmtu) {
1395 mtu = rt->fib6_pmtu;
1396 } else {
1397 struct net_device *dev = fib6_info_nh_dev(rt);
1398 struct inet6_dev *idev;
1399
1400 rcu_read_lock();
1401 idev = __in6_dev_get(dev);
1402 mtu = idev->cnf.mtu6;
1403 rcu_read_unlock();
1404 }
1405
d4ead6b3
DA		 1406 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1407
1408 return mtu - lwtunnel_headroom(rt->fib6_nh.nh_lwtstate, mtu);
1409}
1410
35732d01 1411static int rt6_insert_exception(struct rt6_info *nrt,
8d1c802b 1412 struct fib6_info *ort)
35732d01 1413{
5e670d84 1414 struct net *net = dev_net(nrt->dst.dev);
35732d01
WW		 1415 struct rt6_exception_bucket *bucket;
1416 struct in6_addr *src_key = NULL;
1417 struct rt6_exception *rt6_ex;
1418 int err = 0;
1419
35732d01
WW		 1420 spin_lock_bh(&rt6_exception_lock);
1421
1422 if (ort->exception_bucket_flushed) {
1423 err = -EINVAL;
1424 goto out;
1425 }
1426
1427 bucket = rcu_dereference_protected(ort->rt6i_exception_bucket,
1428 lockdep_is_held(&rt6_exception_lock));
1429 if (!bucket) {
1430 bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket),
1431 GFP_ATOMIC);
1432 if (!bucket) {
1433 err = -ENOMEM;
1434 goto out;
1435 }
1436 rcu_assign_pointer(ort->rt6i_exception_bucket, bucket);
1437 }
1438
1439#ifdef CONFIG_IPV6_SUBTREES
1440 /* rt6i_src.plen != 0 indicates ort is in subtree
1441 * and exception table is indexed by a hash of
1442 * both rt6i_dst and rt6i_src.
1443 * Otherwise, the exception table is indexed by
1444 * a hash of only rt6i_dst.
1445 */
93c2fb25 1446 if (ort->fib6_src.plen)
35732d01
WW		 1447 src_key = &nrt->rt6i_src.addr;
1448#endif
f5bbe7ee
WW		 1449 /* rt6_mtu_change() might lower mtu on ort.
1450 * Only insert this exception route if its mtu
1451 * is less than ort's mtu value.
1452 */
d4ead6b3 1453 if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(ort)) {
f5bbe7ee
WW		 1454 err = -EINVAL;
1455 goto out;
1456 }
60006a48 1457
35732d01
WW		 1458 rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr,
1459 src_key);
1460 if (rt6_ex)
1461 rt6_remove_exception(bucket, rt6_ex);
1462
1463 rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC);
1464 if (!rt6_ex) {
1465 err = -ENOMEM;
1466 goto out;
1467 }
1468 rt6_ex->rt6i = nrt;
1469 rt6_ex->stamp = jiffies;
35732d01
WW		 1470 hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain);
1471 bucket->depth++;
81eb8447 1472 net->ipv6.rt6_stats->fib_rt_cache++;
35732d01
WW		 1473
1474 if (bucket->depth > FIB6_MAX_DEPTH)
1475 rt6_exception_remove_oldest(bucket);
1476
1477out:
1478 spin_unlock_bh(&rt6_exception_lock);
1479
1480 /* Update fn->fn_sernum to invalidate all cached dst */
b886d5f2 1481 if (!err) {
93c2fb25 1482 spin_lock_bh(&ort->fib6_table->tb6_lock);
7aef6859 1483 fib6_update_sernum(net, ort);
93c2fb25 1484 spin_unlock_bh(&ort->fib6_table->tb6_lock);
b886d5f2
PA		 1485 fib6_force_start_gc(net);
1486 }
35732d01
WW		 1487
1488 return err;
1489}
1490
8d1c802b 1491void rt6_flush_exceptions(struct fib6_info *rt)
35732d01
WW		 1492{
1493 struct rt6_exception_bucket *bucket;
1494 struct rt6_exception *rt6_ex;
1495 struct hlist_node *tmp;
1496 int i;
1497
1498 spin_lock_bh(&rt6_exception_lock);
1499 /* Prevent rt6_insert_exception() to recreate the bucket list */
1500 rt->exception_bucket_flushed = 1;
1501
1502 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
1503 lockdep_is_held(&rt6_exception_lock));
1504 if (!bucket)
1505 goto out;
1506
1507 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1508 hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist)
1509 rt6_remove_exception(bucket, rt6_ex);
1510 WARN_ON_ONCE(bucket->depth);
1511 bucket++;
1512 }
1513
1514out:
1515 spin_unlock_bh(&rt6_exception_lock);
1516}
1517
1518/* Find cached rt in the hash table inside passed in rt
1519 * Caller has to hold rcu_read_lock()
1520 */
8d1c802b 1521static struct rt6_info *rt6_find_cached_rt(struct fib6_info *rt,
35732d01
WW		 1522 struct in6_addr *daddr,
1523 struct in6_addr *saddr)
1524{
1525 struct rt6_exception_bucket *bucket;
1526 struct in6_addr *src_key = NULL;
1527 struct rt6_exception *rt6_ex;
1528 struct rt6_info *res = NULL;
1529
1530 bucket = rcu_dereference(rt->rt6i_exception_bucket);
1531
1532#ifdef CONFIG_IPV6_SUBTREES
1533 /* rt6i_src.plen != 0 indicates rt is in subtree
1534 * and exception table is indexed by a hash of
1535 * both rt6i_dst and rt6i_src.
1536 * Otherwise, the exception table is indexed by
1537 * a hash of only rt6i_dst.
1538 */
93c2fb25 1539 if (rt->fib6_src.plen)
35732d01
WW		 1540 src_key = saddr;
1541#endif
1542 rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
1543
1544 if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
1545 res = rt6_ex->rt6i;
1546
1547 return res;
1548}
1549
1550/* Remove the passed in cached rt from the hash table that contains it */
23fb93a4 1551static int rt6_remove_exception_rt(struct rt6_info *rt)
35732d01 1552{
35732d01
WW		 1553 struct rt6_exception_bucket *bucket;
1554 struct in6_addr *src_key = NULL;
1555 struct rt6_exception *rt6_ex;
8a14e46f 1556 struct fib6_info *from;
35732d01
WW		 1557 int err;
1558
091311de 1559 from = rcu_dereference(rt->from);
35732d01 1560 if (!from ||
442d713b 1561 !(rt->rt6i_flags & RTF_CACHE))
35732d01
WW		 1562 return -EINVAL;
1563
1564 if (!rcu_access_pointer(from->rt6i_exception_bucket))
1565 return -ENOENT;
1566
1567 spin_lock_bh(&rt6_exception_lock);
1568 bucket = rcu_dereference_protected(from->rt6i_exception_bucket,
1569 lockdep_is_held(&rt6_exception_lock));
1570#ifdef CONFIG_IPV6_SUBTREES
1571 /* rt6i_src.plen != 0 indicates 'from' is in subtree
1572 * and exception table is indexed by a hash of
1573 * both rt6i_dst and rt6i_src.
1574 * Otherwise, the exception table is indexed by
1575 * a hash of only rt6i_dst.
1576 */
93c2fb25 1577 if (from->fib6_src.plen)
35732d01
WW		 1578 src_key = &rt->rt6i_src.addr;
1579#endif
1580 rt6_ex = __rt6_find_exception_spinlock(&bucket,
1581 &rt->rt6i_dst.addr,
1582 src_key);
1583 if (rt6_ex) {
1584 rt6_remove_exception(bucket, rt6_ex);
1585 err = 0;
1586 } else {
1587 err = -ENOENT;
1588 }
1589
1590 spin_unlock_bh(&rt6_exception_lock);
1591 return err;
1592}
1593
1594/* Find rt6_ex which contains the passed in rt cache and
1595 * refresh its stamp
1596 */
1597static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
1598{
35732d01 1599 struct rt6_exception_bucket *bucket;
8d1c802b 1600 struct fib6_info *from = rt->from;
35732d01
WW		 1601 struct in6_addr *src_key = NULL;
1602 struct rt6_exception *rt6_ex;
1603
1604 if (!from ||
442d713b 1605 !(rt->rt6i_flags & RTF_CACHE))
35732d01
WW		 1606 return;
1607
1608 rcu_read_lock();
1609 bucket = rcu_dereference(from->rt6i_exception_bucket);
1610
1611#ifdef CONFIG_IPV6_SUBTREES
1612 /* rt6i_src.plen != 0 indicates 'from' is in subtree
1613 * and exception table is indexed by a hash of
1614 * both rt6i_dst and rt6i_src.
1615 * Otherwise, the exception table is indexed by
1616 * a hash of only rt6i_dst.
1617 */
93c2fb25 1618 if (from->fib6_src.plen)
35732d01
WW		 1619 src_key = &rt->rt6i_src.addr;
1620#endif
1621 rt6_ex = __rt6_find_exception_rcu(&bucket,
1622 &rt->rt6i_dst.addr,
1623 src_key);
1624 if (rt6_ex)
1625 rt6_ex->stamp = jiffies;
1626
1627 rcu_read_unlock();
1628}
1629
e9fa1495
SB		 1630static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
1631 struct rt6_info *rt, int mtu)
1632{
1633 /* If the new MTU is lower than the route PMTU, this new MTU will be the
1634 * lowest MTU in the path: always allow updating the route PMTU to
1635 * reflect PMTU decreases.
1636 *
1637 * If the new MTU is higher, and the route PMTU is equal to the local
1638 * MTU, this means the old MTU is the lowest in the path, so allow
1639 * updating it: if other nodes now have lower MTUs, PMTU discovery will
1640 * handle this.
1641 */
1642
1643 if (dst_mtu(&rt->dst) >= mtu)
1644 return true;
1645
1646 if (dst_mtu(&rt->dst) == idev->cnf.mtu6)
1647 return true;
1648
1649 return false;
1650}
1651
1652static void rt6_exceptions_update_pmtu(struct inet6_dev *idev,
8d1c802b 1653 struct fib6_info *rt, int mtu)
f5bbe7ee
WW		 1654{
1655 struct rt6_exception_bucket *bucket;
1656 struct rt6_exception *rt6_ex;
1657 int i;
1658
1659 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
1660 lockdep_is_held(&rt6_exception_lock));
1661
e9fa1495
SB		 1662 if (!bucket)
1663 return;
1664
1665 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1666 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
1667 struct rt6_info *entry = rt6_ex->rt6i;
1668
1669 /* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected
d4ead6b3 1670 * route), the metrics of its rt->from have already
e9fa1495
SB		 1671 * been updated.
1672 */
d4ead6b3 1673 if (dst_metric_raw(&entry->dst, RTAX_MTU) &&
e9fa1495 1674 rt6_mtu_change_route_allowed(idev, entry, mtu))
d4ead6b3 1675 dst_metric_set(&entry->dst, RTAX_MTU, mtu);
f5bbe7ee 1676 }
e9fa1495 1677 bucket++;
f5bbe7ee
WW		 1678 }
1679}
1680
b16cb459
WW		 1681#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
1682
8d1c802b 1683static void rt6_exceptions_clean_tohost(struct fib6_info *rt,
b16cb459
WW		 1684 struct in6_addr *gateway)
1685{
1686 struct rt6_exception_bucket *bucket;
1687 struct rt6_exception *rt6_ex;
1688 struct hlist_node *tmp;
1689 int i;
1690
1691 if (!rcu_access_pointer(rt->rt6i_exception_bucket))
1692 return;
1693
1694 spin_lock_bh(&rt6_exception_lock);
1695 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
1696 lockdep_is_held(&rt6_exception_lock));
1697
1698 if (bucket) {
1699 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1700 hlist_for_each_entry_safe(rt6_ex, tmp,
1701 &bucket->chain, hlist) {
1702 struct rt6_info *entry = rt6_ex->rt6i;
1703
1704 if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) ==
1705 RTF_CACHE_GATEWAY &&
1706 ipv6_addr_equal(gateway,
1707 &entry->rt6i_gateway)) {
1708 rt6_remove_exception(bucket, rt6_ex);
1709 }
1710 }
1711 bucket++;
1712 }
1713 }
1714
1715 spin_unlock_bh(&rt6_exception_lock);
1716}
1717
c757faa8
WW		 1718static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket,
1719 struct rt6_exception *rt6_ex,
1720 struct fib6_gc_args *gc_args,
1721 unsigned long now)
1722{
1723 struct rt6_info *rt = rt6_ex->rt6i;
1724
1859bac0
PA		 1725 /* we are pruning and obsoleting aged-out and non gateway exceptions
1726 * even if others have still references to them, so that on next
1727 * dst_check() such references can be dropped.
1728 * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when
1729 * expired, independently from their aging, as per RFC 8201 section 4
1730 */
31afeb42
WW		 1731 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1732 if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) {
1733 RT6_TRACE("aging clone %p\n", rt);
1734 rt6_remove_exception(bucket, rt6_ex);
1735 return;
1736 }
1737 } else if (time_after(jiffies, rt->dst.expires)) {
1738 RT6_TRACE("purging expired route %p\n", rt);
c757faa8
WW		 1739 rt6_remove_exception(bucket, rt6_ex);
1740 return;
31afeb42
WW		 1741 }
1742
1743 if (rt->rt6i_flags & RTF_GATEWAY) {
c757faa8
WW		 1744 struct neighbour *neigh;
1745 __u8 neigh_flags = 0;
1746
1bfa26ff
ED		 1747 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
1748 if (neigh)
c757faa8 1749 neigh_flags = neigh->flags;
1bfa26ff 1750
c757faa8
WW		 1751 if (!(neigh_flags & NTF_ROUTER)) {
1752 RT6_TRACE("purging route %p via non-router but gateway\n",
1753 rt);
1754 rt6_remove_exception(bucket, rt6_ex);
1755 return;
1756 }
1757 }
31afeb42 1758
c757faa8
WW		 1759 gc_args->more++;
1760}
1761
8d1c802b 1762void rt6_age_exceptions(struct fib6_info *rt,
c757faa8
WW		 1763 struct fib6_gc_args *gc_args,
1764 unsigned long now)
1765{
1766 struct rt6_exception_bucket *bucket;
1767 struct rt6_exception *rt6_ex;
1768 struct hlist_node *tmp;
1769 int i;
1770
1771 if (!rcu_access_pointer(rt->rt6i_exception_bucket))
1772 return;
1773
1bfa26ff
ED		 1774 rcu_read_lock_bh();
1775 spin_lock(&rt6_exception_lock);
c757faa8
WW		 1776 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
1777 lockdep_is_held(&rt6_exception_lock));
1778
1779 if (bucket) {
1780 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1781 hlist_for_each_entry_safe(rt6_ex, tmp,
1782 &bucket->chain, hlist) {
1783 rt6_age_examine_exception(bucket, rt6_ex,
1784 gc_args, now);
1785 }
1786 bucket++;
1787 }
1788 }
1bfa26ff
ED		 1789 spin_unlock(&rt6_exception_lock);
1790 rcu_read_unlock_bh();
c757faa8
WW		 1791}
1792
1d053da9
DA		 1793/* must be called with rcu lock held */
1794struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
1795 int oif, struct flowi6 *fl6, int strict)
1da177e4 1796{
367efcb9 1797 struct fib6_node *fn, *saved_fn;
8d1c802b 1798 struct fib6_info *f6i;
1da177e4 1799
6454743b 1800 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 1801 saved_fn = fn;
1da177e4 1802
ca254490
DA		 1803 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1804 oif = 0;
1805
a3c00e46 1806redo_rt6_select:
23fb93a4 1807 f6i = rt6_select(net, fn, oif, strict);
23fb93a4 1808 if (f6i == net->ipv6.fib6_null_entry) {
a3c00e46
MKL		 1809 fn = fib6_backtrack(fn, &fl6->saddr);
1810 if (fn)
1811 goto redo_rt6_select;
367efcb9
MKL		 1812 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1813 /* also consider unreachable route */
1814 strict &= ~RT6_LOOKUP_F_REACHABLE;
1815 fn = saved_fn;
1816 goto redo_rt6_select;
367efcb9 1817 }
a3c00e46
MKL		 1818 }
1819
d4bea421 1820 trace_fib6_table_lookup(net, f6i, table, fl6);
fb9de91e 1821
1d053da9
DA		 1822 return f6i;
1823}
1824
1825struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1826 int oif, struct flowi6 *fl6,
1827 const struct sk_buff *skb, int flags)
1828{
1829 struct fib6_info *f6i;
1830 struct rt6_info *rt;
1831 int strict = 0;
1832
1833 strict |= flags & RT6_LOOKUP_F_IFACE;
1834 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
1835 if (net->ipv6.devconf_all->forwarding == 0)
1836 strict |= RT6_LOOKUP_F_REACHABLE;
1837
1838 rcu_read_lock();
1839
1840 f6i = fib6_table_lookup(net, table, oif, fl6, strict);
1841 if (f6i->fib6_nsiblings)
1842 f6i = fib6_multipath_select(net, f6i, fl6, oif, skb, strict);
1843
23fb93a4 1844 if (f6i == net->ipv6.fib6_null_entry) {
421842ed 1845 rt = net->ipv6.ip6_null_entry;
66f5d6ce 1846 rcu_read_unlock();
d3843fe5 1847 dst_hold(&rt->dst);
d3843fe5 1848 return rt;
23fb93a4
DA		 1849 }
1850
1851 /*Search through exception table */
1852 rt = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr);
1853 if (rt) {
d4ead6b3 1854 if (ip6_hold_safe(net, &rt, true))
d3843fe5 1855 dst_use_noref(&rt->dst, jiffies);
d4ead6b3 1856
66f5d6ce 1857 rcu_read_unlock();
d52d3997 1858 return rt;
3da59bd9 1859 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
93c2fb25 1860 !(f6i->fib6_flags & RTF_GATEWAY))) {
3da59bd9
MKL		 1861 /* Create a RTF_CACHE clone which will not be
1862 * owned by the fib6 tree. It is for the special case where
1863 * the daddr in the skb during the neighbor look-up is different
1864 * from the fl6->daddr used to look-up route here.
1865 */
3da59bd9
MKL		 1866 struct rt6_info *uncached_rt;
1867
23fb93a4 1868 uncached_rt = ip6_rt_cache_alloc(f6i, &fl6->daddr, NULL);
d52d3997 1869
4d85cd0c 1870 rcu_read_unlock();
c71099ac 1871
1cfb71ee
WW		 1872 if (uncached_rt) {
1873 /* Uncached_rt's refcnt is taken during ip6_rt_cache_alloc()
1874 * No need for another dst_hold()
1875 */
8d0b94af 1876 rt6_uncached_list_add(uncached_rt);
81eb8447 1877 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
1cfb71ee 1878 } else {
3da59bd9 1879 uncached_rt = net->ipv6.ip6_null_entry;
1cfb71ee
WW		 1880 dst_hold(&uncached_rt->dst);
1881 }
b811580d 1882
3da59bd9 1883 return uncached_rt;
d52d3997
MKL		 1884 } else {
1885 /* Get a percpu copy */
1886
1887 struct rt6_info *pcpu_rt;
1888
951f788a 1889 local_bh_disable();
23fb93a4 1890 pcpu_rt = rt6_get_pcpu_route(f6i);
d52d3997 1891
93531c67
DA		 1892 if (!pcpu_rt)
1893 pcpu_rt = rt6_make_pcpu_route(net, f6i);
1894
951f788a
ED		 1895 local_bh_enable();
1896 rcu_read_unlock();
d4bea421 1897
d52d3997
MKL		 1898 return pcpu_rt;
1899 }
1da177e4 1900}
9ff74384 1901EXPORT_SYMBOL_GPL(ip6_pol_route);
1da177e4 1902
b75cc8f9
DA		 1903static struct rt6_info *ip6_pol_route_input(struct net *net,
1904 struct fib6_table *table,
1905 struct flowi6 *fl6,
1906 const struct sk_buff *skb,
1907 int flags)
4acad72d 1908{
b75cc8f9 1909 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags);
4acad72d
PE		 1910}
1911
d409b847
MB		 1912struct dst_entry *ip6_route_input_lookup(struct net *net,
1913 struct net_device *dev,
b75cc8f9
DA		 1914 struct flowi6 *fl6,
1915 const struct sk_buff *skb,
1916 int flags)
72331bc0
SL		 1917{
1918 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1919 flags |= RT6_LOOKUP_F_IFACE;
1920
b75cc8f9 1921 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input);
72331bc0 1922}
d409b847 1923EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
72331bc0 1924
23aebdac 1925static void ip6_multipath_l3_keys(const struct sk_buff *skb,
5e5d6fed
RP		 1926 struct flow_keys *keys,
1927 struct flow_keys *flkeys)
23aebdac
JS		 1928{
1929 const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
1930 const struct ipv6hdr *key_iph = outer_iph;
5e5d6fed 1931 struct flow_keys *_flkeys = flkeys;
23aebdac
JS		 1932 const struct ipv6hdr *inner_iph;
1933 const struct icmp6hdr *icmph;
1934 struct ipv6hdr _inner_iph;
cea67a2d 1935 struct icmp6hdr _icmph;
23aebdac
JS		 1936
1937 if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6))
1938 goto out;
1939
cea67a2d
ED		 1940 icmph = skb_header_pointer(skb, skb_transport_offset(skb),
1941 sizeof(_icmph), &_icmph);
1942 if (!icmph)
1943 goto out;
1944
23aebdac
JS		 1945 if (icmph->icmp6_type != ICMPV6_DEST_UNREACH &&
1946 icmph->icmp6_type != ICMPV6_PKT_TOOBIG &&
1947 icmph->icmp6_type != ICMPV6_TIME_EXCEED &&
1948 icmph->icmp6_type != ICMPV6_PARAMPROB)
1949 goto out;
1950
1951 inner_iph = skb_header_pointer(skb,
1952 skb_transport_offset(skb) + sizeof(*icmph),
1953 sizeof(_inner_iph), &_inner_iph);
1954 if (!inner_iph)
1955 goto out;
1956
1957 key_iph = inner_iph;
5e5d6fed 1958 _flkeys = NULL;
23aebdac 1959out:
5e5d6fed
RP		 1960 if (_flkeys) {
1961 keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src;
1962 keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst;
1963 keys->tags.flow_label = _flkeys->tags.flow_label;
1964 keys->basic.ip_proto = _flkeys->basic.ip_proto;
1965 } else {
1966 keys->addrs.v6addrs.src = key_iph->saddr;
1967 keys->addrs.v6addrs.dst = key_iph->daddr;
fa1be7e0 1968 keys->tags.flow_label = ip6_flowlabel(key_iph);
5e5d6fed
RP		 1969 keys->basic.ip_proto = key_iph->nexthdr;
1970 }
23aebdac
JS		 1971}
1972
1973/* if skb is set it will be used and fl6 can be NULL */
b4bac172
DA		 1974u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
1975 const struct sk_buff *skb, struct flow_keys *flkeys)
23aebdac
JS		 1976{
1977 struct flow_keys hash_keys;
9a2a537a 1978 u32 mhash;
23aebdac 1979
bbfa047a 1980 switch (ip6_multipath_hash_policy(net)) {
b4bac172
DA		 1981 case 0:
1982 memset(&hash_keys, 0, sizeof(hash_keys));
1983 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1984 if (skb) {
1985 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
1986 } else {
1987 hash_keys.addrs.v6addrs.src = fl6->saddr;
1988 hash_keys.addrs.v6addrs.dst = fl6->daddr;
fa1be7e0 1989 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
b4bac172
DA		 1990 hash_keys.basic.ip_proto = fl6->flowi6_proto;
1991 }
1992 break;
1993 case 1:
1994 if (skb) {
1995 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
1996 struct flow_keys keys;
1997
1998 /* short-circuit if we already have L4 hash present */
1999 if (skb->l4_hash)
2000 return skb_get_hash_raw(skb) >> 1;
2001
2002 memset(&hash_keys, 0, sizeof(hash_keys));
2003
2004 if (!flkeys) {
2005 skb_flow_dissect_flow_keys(skb, &keys, flag);
2006 flkeys = &keys;
2007 }
2008 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2009 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2010 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2011 hash_keys.ports.src = flkeys->ports.src;
2012 hash_keys.ports.dst = flkeys->ports.dst;
2013 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2014 } else {
2015 memset(&hash_keys, 0, sizeof(hash_keys));
2016 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2017 hash_keys.addrs.v6addrs.src = fl6->saddr;
2018 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2019 hash_keys.ports.src = fl6->fl6_sport;
2020 hash_keys.ports.dst = fl6->fl6_dport;
2021 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2022 }
2023 break;
23aebdac 2024 }
9a2a537a 2025 mhash = flow_hash_from_keys(&hash_keys);
23aebdac 2026
9a2a537a 2027 return mhash >> 1;
23aebdac
JS		 2028}
2029
c71099ac
TG		 2030void ip6_route_input(struct sk_buff *skb)
2031{
b71d1d42 2032 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 2033 struct net *net = dev_net(skb->dev);
adaa70bb 2034 int flags = RT6_LOOKUP_F_HAS_SADDR;
904af04d 2035 struct ip_tunnel_info *tun_info;
4c9483b2 2036 struct flowi6 fl6 = {
e0d56fdd 2037 .flowi6_iif = skb->dev->ifindex,
4c9483b2
DM		 2038 .daddr = iph->daddr,
2039 .saddr = iph->saddr,
6502ca52 2040 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 2041 .flowi6_mark = skb->mark,
2042 .flowi6_proto = iph->nexthdr,
c71099ac 2043 };
5e5d6fed 2044 struct flow_keys *flkeys = NULL, _flkeys;
adaa70bb 2045
904af04d 2046 tun_info = skb_tunnel_info(skb);
46fa062a 2047 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 2048 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
5e5d6fed
RP		 2049
2050 if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys))
2051 flkeys = &_flkeys;
2052
23aebdac 2053 if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6))
b4bac172 2054 fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys);
06e9d040 2055 skb_dst_drop(skb);
b75cc8f9
DA		 2056 skb_dst_set(skb,
2057 ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags));
c71099ac
TG		 2058}
2059
b75cc8f9
DA		 2060static struct rt6_info *ip6_pol_route_output(struct net *net,
2061 struct fib6_table *table,
2062 struct flowi6 *fl6,
2063 const struct sk_buff *skb,
2064 int flags)
1da177e4 2065{
b75cc8f9 2066 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags);
c71099ac
TG		 2067}
2068
6f21c96a
PA		 2069struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
2070 struct flowi6 *fl6, int flags)
c71099ac 2071{
d46a9d67 2072 bool any_src;
c71099ac 2073
3ede0bbc
RS		 2074 if (ipv6_addr_type(&fl6->daddr) &
2075 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) {
4c1feac5
DA		 2076 struct dst_entry *dst;
2077
2078 dst = l3mdev_link_scope_lookup(net, fl6);
2079 if (dst)
2080 return dst;
2081 }
ca254490 2082
1fb9489b 2083 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 2084
d46a9d67 2085 any_src = ipv6_addr_any(&fl6->saddr);
741a11d9 2086 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
d46a9d67 2087 (fl6->flowi6_oif && any_src))
77d16f45 2088 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 2089
d46a9d67 2090 if (!any_src)
adaa70bb 2091 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 2092 else if (sk)
2093 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 2094
b75cc8f9 2095 return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output);
1da177e4 2096}
6f21c96a 2097EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1da177e4 2098
2774c131 2099struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 2100{
5c1e6aa3 2101 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1dbe3252 2102 struct net_device *loopback_dev = net->loopback_dev;
14e50e57
DM		 2103 struct dst_entry *new = NULL;
2104
1dbe3252 2105 rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
62cf27e5 2106 DST_OBSOLETE_DEAD, 0);
14e50e57 2107 if (rt) {
0a1f5962 2108 rt6_info_init(rt);
81eb8447 2109 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
8104891b 2110
0a1f5962 2111 new = &rt->dst;
14e50e57 2112 new->__use = 1;
352e512c 2113 new->input = dst_discard;
ede2059d 2114 new->output = dst_discard_out;
14e50e57 2115
0a1f5962 2116 dst_copy_metrics(new, &ort->dst);
14e50e57 2117
1dbe3252 2118 rt->rt6i_idev = in6_dev_get(loopback_dev);
4e3fd7a0 2119 rt->rt6i_gateway = ort->rt6i_gateway;
0a1f5962 2120 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
14e50e57
DM		 2121
2122 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
2123#ifdef CONFIG_IPV6_SUBTREES
2124 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
2125#endif
14e50e57
DM		 2126 }
2127
69ead7af
DM		 2128 dst_release(dst_orig);
2129 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 2130}
14e50e57 2131
1da177e4
LT		 2132/*
2133 * Destination cache support functions
2134 */
2135
8d1c802b 2136static bool fib6_check(struct fib6_info *f6i, u32 cookie)
4b32b5ad 2137{
93531c67
DA		 2138 u32 rt_cookie = 0;
2139
8ae86971 2140 if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie)
93531c67
DA		 2141 return false;
2142
2143 if (fib6_check_expired(f6i))
2144 return false;
2145
2146 return true;
4b32b5ad
MKL		 2147}
2148
a68886a6
DA		 2149static struct dst_entry *rt6_check(struct rt6_info *rt,
2150 struct fib6_info *from,
2151 u32 cookie)
3da59bd9 2152{
36143645 2153 u32 rt_cookie = 0;
c5cff856 2154
a68886a6 2155 if ((from && !fib6_get_cookie_safe(from, &rt_cookie)) ||
93531c67 2156 rt_cookie != cookie)
3da59bd9
MKL		 2157 return NULL;
2158
2159 if (rt6_check_expired(rt))
2160 return NULL;
2161
2162 return &rt->dst;
2163}
2164
a68886a6
DA		 2165static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt,
2166 struct fib6_info *from,
2167 u32 cookie)
3da59bd9 2168{
5973fb1e
MKL		 2169 if (!__rt6_check_expired(rt) &&
2170 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
a68886a6 2171 fib6_check(from, cookie))
3da59bd9
MKL		 2172 return &rt->dst;
2173 else
2174 return NULL;
2175}
2176
1da177e4
LT		 2177static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
2178{
a87b7dc9 2179 struct dst_entry *dst_ret;
a68886a6 2180 struct fib6_info *from;
1da177e4
LT		 2181 struct rt6_info *rt;
2182
a87b7dc9
DA		 2183 rt = container_of(dst, struct rt6_info, dst);
2184
2185 rcu_read_lock();
1da177e4 2186
6f3118b5
ND		 2187 /* All IPV6 dsts are created with ->obsolete set to the value
2188 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
2189 * into this function always.
2190 */
e3bc10bd 2191
a68886a6 2192 from = rcu_dereference(rt->from);
4b32b5ad 2193
a68886a6
DA		 2194 if (from && (rt->rt6i_flags & RTF_PCPU ||
2195 unlikely(!list_empty(&rt->rt6i_uncached))))
2196 dst_ret = rt6_dst_from_check(rt, from, cookie);
3da59bd9 2197 else
a68886a6 2198 dst_ret = rt6_check(rt, from, cookie);
a87b7dc9
DA		 2199
2200 rcu_read_unlock();
2201
2202 return dst_ret;
1da177e4
LT		 2203}
2204
2205static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
2206{
2207 struct rt6_info *rt = (struct rt6_info *) dst;
2208
2209 if (rt) {
54c1a859 2210 if (rt->rt6i_flags & RTF_CACHE) {
c3c14da0 2211 rcu_read_lock();
54c1a859 2212 if (rt6_check_expired(rt)) {
93531c67 2213 rt6_remove_exception_rt(rt);
54c1a859
YH		 2214 dst = NULL;
2215 }
c3c14da0 2216 rcu_read_unlock();
54c1a859 2217 } else {
1da177e4 2218 dst_release(dst);
54c1a859
YH		 2219 dst = NULL;
2220 }
1da177e4 2221 }
54c1a859 2222 return dst;
1da177e4
LT		 2223}
2224
2225static void ip6_link_failure(struct sk_buff *skb)
2226{
2227 struct rt6_info *rt;
2228
3ffe533c 2229 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 2230
adf30907 2231 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 2232 if (rt) {
8a14e46f 2233 rcu_read_lock();
1eb4f758 2234 if (rt->rt6i_flags & RTF_CACHE) {
761f6026 2235 rt6_remove_exception_rt(rt);
c5cff856 2236 } else {
a68886a6 2237 struct fib6_info *from;
c5cff856
WW		 2238 struct fib6_node *fn;
2239
a68886a6
DA		 2240 from = rcu_dereference(rt->from);
2241 if (from) {
2242 fn = rcu_dereference(from->fib6_node);
2243 if (fn && (rt->rt6i_flags & RTF_DEFAULT))
2244 fn->fn_sernum = -1;
2245 }
1eb4f758 2246 }
8a14e46f 2247 rcu_read_unlock();
1da177e4
LT		 2248 }
2249}
2250
6a3e030f
DA		 2251static void rt6_update_expires(struct rt6_info *rt0, int timeout)
2252{
a68886a6
DA		 2253 if (!(rt0->rt6i_flags & RTF_EXPIRES)) {
2254 struct fib6_info *from;
2255
2256 rcu_read_lock();
2257 from = rcu_dereference(rt0->from);
2258 if (from)
2259 rt0->dst.expires = from->expires;
2260 rcu_read_unlock();
2261 }
6a3e030f
DA		 2262
2263 dst_set_expires(&rt0->dst, timeout);
2264 rt0->rt6i_flags |= RTF_EXPIRES;
2265}
2266
45e4fd26
MKL		 2267static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
2268{
2269 struct net *net = dev_net(rt->dst.dev);
2270
d4ead6b3 2271 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
45e4fd26 2272 rt->rt6i_flags |= RTF_MODIFIED;
45e4fd26
MKL		 2273 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
2274}
2275
0d3f6d29
MKL		 2276static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
2277{
a68886a6
DA		 2278 bool from_set;
2279
2280 rcu_read_lock();
2281 from_set = !!rcu_dereference(rt->from);
2282 rcu_read_unlock();
2283
0d3f6d29 2284 return !(rt->rt6i_flags & RTF_CACHE) &&
a68886a6 2285 (rt->rt6i_flags & RTF_PCPU || from_set);
0d3f6d29
MKL		 2286}
2287
45e4fd26
MKL		 2288static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
2289 const struct ipv6hdr *iph, u32 mtu)
1da177e4 2290{
0dec879f 2291 const struct in6_addr *daddr, *saddr;
67ba4152 2292 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 2293
19bda36c
XL		 2294 if (dst_metric_locked(dst, RTAX_MTU))
2295 return;
2296
0dec879f
JA		 2297 if (iph) {
2298 daddr = &iph->daddr;
2299 saddr = &iph->saddr;
2300 } else if (sk) {
2301 daddr = &sk->sk_v6_daddr;
2302 saddr = &inet6_sk(sk)->saddr;
2303 } else {
2304 daddr = NULL;
2305 saddr = NULL;
2306 }
2307 dst_confirm_neigh(dst, daddr);
45e4fd26
MKL		 2308 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
2309 if (mtu >= dst_mtu(dst))
2310 return;
9d289715 2311
0d3f6d29 2312 if (!rt6_cache_allowed_for_pmtu(rt6)) {
45e4fd26 2313 rt6_do_update_pmtu(rt6, mtu);
2b760fcf
WW		 2314 /* update rt6_ex->stamp for cache */
2315 if (rt6->rt6i_flags & RTF_CACHE)
2316 rt6_update_exception_stamp_rt(rt6);
0dec879f 2317 } else if (daddr) {
a68886a6 2318 struct fib6_info *from;
45e4fd26
MKL		 2319 struct rt6_info *nrt6;
2320
4d85cd0c 2321 rcu_read_lock();
a68886a6
DA		 2322 from = rcu_dereference(rt6->from);
2323 nrt6 = ip6_rt_cache_alloc(from, daddr, saddr);
45e4fd26
MKL		 2324 if (nrt6) {
2325 rt6_do_update_pmtu(nrt6, mtu);
a68886a6 2326 if (rt6_insert_exception(nrt6, from))
2b760fcf 2327 dst_release_immediate(&nrt6->dst);
45e4fd26 2328 }
a68886a6 2329 rcu_read_unlock();
1da177e4
LT		 2330 }
2331}
2332
45e4fd26
MKL		 2333static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
2334 struct sk_buff *skb, u32 mtu)
2335{
2336 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
2337}
2338
42ae66c8 2339void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
e2d118a1 2340 int oif, u32 mark, kuid_t uid)
81aded24
DM		 2341{
2342 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
2343 struct dst_entry *dst;
dc92095d
MŻ		 2344 struct flowi6 fl6 = {
2345 .flowi6_oif = oif,
2346 .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark),
2347 .daddr = iph->daddr,
2348 .saddr = iph->saddr,
2349 .flowlabel = ip6_flowinfo(iph),
2350 .flowi6_uid = uid,
2351 };
81aded24
DM		 2352
2353 dst = ip6_route_output(net, NULL, &fl6);
2354 if (!dst->error)
45e4fd26 2355 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
81aded24
DM		 2356 dst_release(dst);
2357}
2358EXPORT_SYMBOL_GPL(ip6_update_pmtu);
2359
2360void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
2361{
33c162a9
MKL		 2362 struct dst_entry *dst;
2363
81aded24 2364 ip6_update_pmtu(skb, sock_net(sk), mtu,
e2d118a1 2365 sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid);
33c162a9
MKL		 2366
2367 dst = __sk_dst_get(sk);
2368 if (!dst || !dst->obsolete ||
2369 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
2370 return;
2371
2372 bh_lock_sock(sk);
2373 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
2374 ip6_datagram_dst_update(sk, false);
2375 bh_unlock_sock(sk);
81aded24
DM		 2376}
2377EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
2378
7d6850f7
AK		 2379void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
2380 const struct flowi6 *fl6)
2381{
2382#ifdef CONFIG_IPV6_SUBTREES
2383 struct ipv6_pinfo *np = inet6_sk(sk);
2384#endif
2385
2386 ip6_dst_store(sk, dst,
2387 ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
2388 &sk->sk_v6_daddr : NULL,
2389#ifdef CONFIG_IPV6_SUBTREES
2390 ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
2391 &np->saddr :
2392#endif
2393 NULL);
2394}
2395
b55b76b2
DJ		 2396/* Handle redirects */
2397struct ip6rd_flowi {
2398 struct flowi6 fl6;
2399 struct in6_addr gateway;
2400};
2401
2402static struct rt6_info *__ip6_route_redirect(struct net *net,
2403 struct fib6_table *table,
2404 struct flowi6 *fl6,
b75cc8f9 2405 const struct sk_buff *skb,
b55b76b2
DJ		 2406 int flags)
2407{
2408 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
23fb93a4 2409 struct rt6_info *ret = NULL, *rt_cache;
8d1c802b 2410 struct fib6_info *rt;
b55b76b2
DJ		 2411 struct fib6_node *fn;
2412
2413 /* Get the "current" route for this destination and
67c408cf 2414 * check if the redirect has come from appropriate router.
b55b76b2
DJ		 2415 *
2416 * RFC 4861 specifies that redirects should only be
2417 * accepted if they come from the nexthop to the target.
2418 * Due to the way the routes are chosen, this notion
2419 * is a bit fuzzy and one might need to check all possible
2420 * routes.
2421 */
2422
66f5d6ce 2423 rcu_read_lock();
6454743b 2424 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
b55b76b2 2425restart:
66f5d6ce 2426 for_each_fib6_node_rt_rcu(fn) {
5e670d84 2427 if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
8067bb8c 2428 continue;
14895687 2429 if (fib6_check_expired(rt))
b55b76b2 2430 continue;
93c2fb25 2431 if (rt->fib6_flags & RTF_REJECT)
b55b76b2 2432 break;
93c2fb25 2433 if (!(rt->fib6_flags & RTF_GATEWAY))
b55b76b2 2434 continue;
5e670d84 2435 if (fl6->flowi6_oif != rt->fib6_nh.nh_dev->ifindex)
b55b76b2 2436 continue;
2b760fcf
WW		 2437 /* rt_cache's gateway might be different from its 'parent'
2438 * in the case of an ip redirect.
2439 * So we keep searching in the exception table if the gateway
2440 * is different.
2441 */
5e670d84 2442 if (!ipv6_addr_equal(&rdfl->gateway, &rt->fib6_nh.nh_gw)) {
2b760fcf
WW		 2443 rt_cache = rt6_find_cached_rt(rt,
2444 &fl6->daddr,
2445 &fl6->saddr);
2446 if (rt_cache &&
2447 ipv6_addr_equal(&rdfl->gateway,
2448 &rt_cache->rt6i_gateway)) {
23fb93a4 2449 ret = rt_cache;
2b760fcf
WW		 2450 break;
2451 }
b55b76b2 2452 continue;
2b760fcf 2453 }
b55b76b2
DJ		 2454 break;
2455 }
2456
2457 if (!rt)
421842ed 2458 rt = net->ipv6.fib6_null_entry;
93c2fb25 2459 else if (rt->fib6_flags & RTF_REJECT) {
23fb93a4 2460 ret = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 2461 goto out;
2462 }
2463
421842ed 2464 if (rt == net->ipv6.fib6_null_entry) {
a3c00e46
MKL		 2465 fn = fib6_backtrack(fn, &fl6->saddr);
2466 if (fn)
2467 goto restart;
b55b76b2 2468 }
a3c00e46 2469
b0a1ba59 2470out:
23fb93a4 2471 if (ret)
e873e4b9 2472 ip6_hold_safe(net, &ret, true);
23fb93a4
DA		 2473 else
2474 ret = ip6_create_rt_rcu(rt);
b55b76b2 2475
66f5d6ce 2476 rcu_read_unlock();
b55b76b2 2477
b65f164d 2478 trace_fib6_table_lookup(net, rt, table, fl6);
23fb93a4 2479 return ret;
b55b76b2
DJ		 2480};
2481
2482static struct dst_entry *ip6_route_redirect(struct net *net,
b75cc8f9
DA		 2483 const struct flowi6 *fl6,
2484 const struct sk_buff *skb,
2485 const struct in6_addr *gateway)
b55b76b2
DJ		 2486{
2487 int flags = RT6_LOOKUP_F_HAS_SADDR;
2488 struct ip6rd_flowi rdfl;
2489
2490 rdfl.fl6 = *fl6;
2491 rdfl.gateway = *gateway;
2492
b75cc8f9 2493 return fib6_rule_lookup(net, &rdfl.fl6, skb,
b55b76b2
DJ		 2494 flags, __ip6_route_redirect);
2495}
2496
e2d118a1
LC		 2497void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
2498 kuid_t uid)
3a5ad2ee
DM		 2499{
2500 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
2501 struct dst_entry *dst;
1f7f10ac
MŻ		 2502 struct flowi6 fl6 = {
2503 .flowi6_iif = LOOPBACK_IFINDEX,
2504 .flowi6_oif = oif,
2505 .flowi6_mark = mark,
2506 .daddr = iph->daddr,
2507 .saddr = iph->saddr,
2508 .flowlabel = ip6_flowinfo(iph),
2509 .flowi6_uid = uid,
2510 };
3a5ad2ee 2511
b75cc8f9 2512 dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr);
b55b76b2 2513 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 2514 dst_release(dst);
2515}
2516EXPORT_SYMBOL_GPL(ip6_redirect);
2517
d456336d 2518void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif)
c92a59ec
DJ		 2519{
2520 const struct ipv6hdr *iph = ipv6_hdr(skb);
2521 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
2522 struct dst_entry *dst;
0b26fb17
MŻ		 2523 struct flowi6 fl6 = {
2524 .flowi6_iif = LOOPBACK_IFINDEX,
2525 .flowi6_oif = oif,
0b26fb17
MŻ		 2526 .daddr = msg->dest,
2527 .saddr = iph->daddr,
2528 .flowi6_uid = sock_net_uid(net, NULL),
2529 };
c92a59ec 2530
b75cc8f9 2531 dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr);
b55b76b2 2532 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 2533 dst_release(dst);
2534}
2535
3a5ad2ee
DM		 2536void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
2537{
e2d118a1
LC		 2538 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
2539 sk->sk_uid);
3a5ad2ee
DM		 2540}
2541EXPORT_SYMBOL_GPL(ip6_sk_redirect);
2542
0dbaee3b 2543static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 2544{
0dbaee3b
DM		 2545 struct net_device *dev = dst->dev;
2546 unsigned int mtu = dst_mtu(dst);
2547 struct net *net = dev_net(dev);
2548
1da177e4
LT		 2549 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
2550
5578689a
DL		 2551 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
2552 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 2553
2554 /*
1ab1457c
YH		 2555 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
2556 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
2557 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 2558 * rely only on pmtu discovery"
2559 */
2560 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
2561 mtu = IPV6_MAXPLEN;
2562 return mtu;
2563}
2564
ebb762f2 2565static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 2566{
d33e4553 2567 struct inet6_dev *idev;
d4ead6b3 2568 unsigned int mtu;
4b32b5ad
MKL		 2569
2570 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 2571 if (mtu)
30f78d8e 2572 goto out;
618f9bc7
SK		 2573
2574 mtu = IPV6_MIN_MTU;
d33e4553
DM		 2575
2576 rcu_read_lock();
2577 idev = __in6_dev_get(dst->dev);
2578 if (idev)
2579 mtu = idev->cnf.mtu6;
2580 rcu_read_unlock();
2581
30f78d8e 2582out:
14972cbd
RP		 2583 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
2584
2585 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
d33e4553
DM		 2586}
2587
901731b8
DA		 2588/* MTU selection:
2589 * 1. mtu on route is locked - use it
2590 * 2. mtu from nexthop exception
2591 * 3. mtu from egress device
2592 *
2593 * based on ip6_dst_mtu_forward and exception logic of
2594 * rt6_find_cached_rt; called with rcu_read_lock
2595 */
2596u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
2597 struct in6_addr *saddr)
2598{
2599 struct rt6_exception_bucket *bucket;
2600 struct rt6_exception *rt6_ex;
2601 struct in6_addr *src_key;
2602 struct inet6_dev *idev;
2603 u32 mtu = 0;
2604
2605 if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) {
2606 mtu = f6i->fib6_pmtu;
2607 if (mtu)
2608 goto out;
2609 }
2610
2611 src_key = NULL;
2612#ifdef CONFIG_IPV6_SUBTREES
2613 if (f6i->fib6_src.plen)
2614 src_key = saddr;
2615#endif
2616
2617 bucket = rcu_dereference(f6i->rt6i_exception_bucket);
2618 rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
2619 if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
2620 mtu = dst_metric_raw(&rt6_ex->rt6i->dst, RTAX_MTU);
2621
2622 if (likely(!mtu)) {
2623 struct net_device *dev = fib6_info_nh_dev(f6i);
2624
2625 mtu = IPV6_MIN_MTU;
2626 idev = __in6_dev_get(dev);
2627 if (idev && idev->cnf.mtu6 > mtu)
2628 mtu = idev->cnf.mtu6;
2629 }
2630
2631 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
2632out:
2633 return mtu - lwtunnel_headroom(fib6_info_nh_lwt(f6i), mtu);
2634}
2635
3b00944c 2636struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 2637 struct flowi6 *fl6)
1da177e4 2638{
87a11578 2639 struct dst_entry *dst;
1da177e4
LT		 2640 struct rt6_info *rt;
2641 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 2642 struct net *net = dev_net(dev);
1da177e4 2643
38308473 2644 if (unlikely(!idev))
122bdf67 2645 return ERR_PTR(-ENODEV);
1da177e4 2646
ad706862 2647 rt = ip6_dst_alloc(net, dev, 0);
38308473 2648 if (unlikely(!rt)) {
1da177e4 2649 in6_dev_put(idev);
87a11578 2650 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 2651 goto out;
2652 }
2653
8e2ec639 2654 rt->dst.flags |= DST_HOST;
588753f1 2655 rt->dst.input = ip6_input;
8e2ec639 2656 rt->dst.output = ip6_output;
550bab42 2657 rt->rt6i_gateway = fl6->daddr;
87a11578 2658 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 2659 rt->rt6i_dst.plen = 128;
2660 rt->rt6i_idev = idev;
14edd87d 2661 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 2662
4c981e28 2663 /* Add this dst into uncached_list so that rt6_disable_ip() can
587fea74
WW		 2664 * do proper release of the net_device
2665 */
2666 rt6_uncached_list_add(rt);
81eb8447 2667 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
1da177e4 2668
87a11578
DM		 2669 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
2670
1da177e4 2671out:
87a11578 2672 return dst;
1da177e4
LT		 2673}
2674
569d3645 2675static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 2676{
86393e52 2677 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 2678 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
2679 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
2680 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
2681 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
2682 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 2683 int entries;
7019b78e 2684
fc66f95c 2685 entries = dst_entries_get_fast(ops);
49a18d86 2686 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 2687 entries <= rt_max_size)
1da177e4
LT		 2688 goto out;
2689
6891a346 2690 net->ipv6.ip6_rt_gc_expire++;
14956643 2691 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 2692 entries = dst_entries_get_slow(ops);
2693 if (entries < ops->gc_thresh)
7019b78e 2694 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 2695out:
7019b78e 2696 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 2697 return entries > rt_max_size;
1da177e4
LT		 2698}
2699
8c14586f
DA		 2700static struct rt6_info *ip6_nh_lookup_table(struct net *net,
2701 struct fib6_config *cfg,
f4797b33
DA		 2702 const struct in6_addr *gw_addr,
2703 u32 tbid, int flags)
8c14586f
DA		 2704{
2705 struct flowi6 fl6 = {
2706 .flowi6_oif = cfg->fc_ifindex,
2707 .daddr = *gw_addr,
2708 .saddr = cfg->fc_prefsrc,
2709 };
2710 struct fib6_table *table;
2711 struct rt6_info *rt;
8c14586f 2712
f4797b33 2713 table = fib6_get_table(net, tbid);
8c14586f
DA		 2714 if (!table)
2715 return NULL;
2716
2717 if (!ipv6_addr_any(&cfg->fc_prefsrc))
2718 flags |= RT6_LOOKUP_F_HAS_SADDR;
2719
f4797b33 2720 flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE;
b75cc8f9 2721 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, NULL, flags);
8c14586f
DA		 2722
2723 /* if table lookup failed, fall back to full lookup */
2724 if (rt == net->ipv6.ip6_null_entry) {
2725 ip6_rt_put(rt);
2726 rt = NULL;
2727 }
2728
2729 return rt;
2730}
2731
fc1e64e1
DA		 2732static int ip6_route_check_nh_onlink(struct net *net,
2733 struct fib6_config *cfg,
9fbb704c 2734 const struct net_device *dev,
fc1e64e1
DA		 2735 struct netlink_ext_ack *extack)
2736{
44750f84 2737 u32 tbid = l3mdev_fib_table(dev) ? : RT_TABLE_MAIN;
fc1e64e1
DA		 2738 const struct in6_addr *gw_addr = &cfg->fc_gateway;
2739 u32 flags = RTF_LOCAL | RTF_ANYCAST | RTF_REJECT;
2740 struct rt6_info *grt;
2741 int err;
2742
2743 err = 0;
2744 grt = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0);
2745 if (grt) {
58e354c0 2746 if (!grt->dst.error &&
4ed591c8
DA		 2747 /* ignore match if it is the default route */
2748 grt->from && !ipv6_addr_any(&grt->from->fib6_dst.addr) &&
58e354c0 2749 (grt->rt6i_flags & flags || dev != grt->dst.dev)) {
44750f84
DA		 2750 NL_SET_ERR_MSG(extack,
2751 "Nexthop has invalid gateway or device mismatch");
fc1e64e1
DA		 2752 err = -EINVAL;
2753 }
2754
2755 ip6_rt_put(grt);
2756 }
2757
2758 return err;
2759}
2760
1edce99f
DA		 2761static int ip6_route_check_nh(struct net *net,
2762 struct fib6_config *cfg,
2763 struct net_device **_dev,
2764 struct inet6_dev **idev)
2765{
2766 const struct in6_addr *gw_addr = &cfg->fc_gateway;
2767 struct net_device *dev = _dev ? *_dev : NULL;
2768 struct rt6_info *grt = NULL;
2769 int err = -EHOSTUNREACH;
2770
2771 if (cfg->fc_table) {
f4797b33
DA		 2772 int flags = RT6_LOOKUP_F_IFACE;
2773
2774 grt = ip6_nh_lookup_table(net, cfg, gw_addr,
2775 cfg->fc_table, flags);
1edce99f
DA		 2776 if (grt) {
2777 if (grt->rt6i_flags & RTF_GATEWAY ||
2778 (dev && dev != grt->dst.dev)) {
2779 ip6_rt_put(grt);
2780 grt = NULL;
2781 }
2782 }
2783 }
2784
2785 if (!grt)
b75cc8f9 2786 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, NULL, 1);
1edce99f
DA		 2787
2788 if (!grt)
2789 goto out;
2790
2791 if (dev) {
2792 if (dev != grt->dst.dev) {
2793 ip6_rt_put(grt);
2794 goto out;
2795 }
2796 } else {
2797 *_dev = dev = grt->dst.dev;
2798 *idev = grt->rt6i_idev;
2799 dev_hold(dev);
2800 in6_dev_hold(grt->rt6i_idev);
2801 }
2802
2803 if (!(grt->rt6i_flags & RTF_GATEWAY))
2804 err = 0;
2805
2806 ip6_rt_put(grt);
2807
2808out:
2809 return err;
2810}
2811
9fbb704c
DA		 2812static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
2813 struct net_device **_dev, struct inet6_dev **idev,
2814 struct netlink_ext_ack *extack)
2815{
2816 const struct in6_addr *gw_addr = &cfg->fc_gateway;
2817 int gwa_type = ipv6_addr_type(gw_addr);
232378e8 2818 bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true;
9fbb704c 2819 const struct net_device *dev = *_dev;
232378e8 2820 bool need_addr_check = !dev;
9fbb704c
DA		 2821 int err = -EINVAL;
2822
2823 /* if gw_addr is local we will fail to detect this in case
2824 * address is still TENTATIVE (DAD in progress). rt6_lookup()
2825 * will return already-added prefix route via interface that
2826 * prefix route was assigned to, which might be non-loopback.
2827 */
232378e8
DA		 2828 if (dev &&
2829 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
2830 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
9fbb704c
DA		 2831 goto out;
2832 }
2833
2834 if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) {
2835 /* IPv6 strictly inhibits using not link-local
2836 * addresses as nexthop address.
2837 * Otherwise, router will not able to send redirects.
2838 * It is very good, but in some (rare!) circumstances
2839 * (SIT, PtP, NBMA NOARP links) it is handy to allow
2840 * some exceptions. --ANK
2841 * We allow IPv4-mapped nexthops to support RFC4798-type
2842 * addressing
2843 */
2844 if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) {
2845 NL_SET_ERR_MSG(extack, "Invalid gateway address");
2846 goto out;
2847 }
2848
2849 if (cfg->fc_flags & RTNH_F_ONLINK)
2850 err = ip6_route_check_nh_onlink(net, cfg, dev, extack);
2851 else
2852 err = ip6_route_check_nh(net, cfg, _dev, idev);
2853
2854 if (err)
2855 goto out;
2856 }
2857
2858 /* reload in case device was changed */
2859 dev = *_dev;
2860
2861 err = -EINVAL;
2862 if (!dev) {
2863 NL_SET_ERR_MSG(extack, "Egress device not specified");
2864 goto out;
2865 } else if (dev->flags & IFF_LOOPBACK) {
2866 NL_SET_ERR_MSG(extack,
2867 "Egress device can not be loopback device for this route");
2868 goto out;
2869 }
232378e8
DA		 2870
2871 /* if we did not check gw_addr above, do so now that the
2872 * egress device has been resolved.
2873 */
2874 if (need_addr_check &&
2875 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
2876 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
2877 goto out;
2878 }
2879
9fbb704c
DA		 2880 err = 0;
2881out:
2882 return err;
2883}
2884
8d1c802b 2885static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
acb54e3c 2886 gfp_t gfp_flags,
333c4301 2887 struct netlink_ext_ack *extack)
1da177e4 2888{
5578689a 2889 struct net *net = cfg->fc_nlinfo.nl_net;
8d1c802b 2890 struct fib6_info *rt = NULL;
1da177e4
LT		 2891 struct net_device *dev = NULL;
2892 struct inet6_dev *idev = NULL;
c71099ac 2893 struct fib6_table *table;
1da177e4 2894 int addr_type;
8c5b83f0 2895 int err = -EINVAL;
1da177e4 2896
557c44be 2897 /* RTF_PCPU is an internal flag; can not be set by userspace */
d5d531cb
DA		 2898 if (cfg->fc_flags & RTF_PCPU) {
2899 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
557c44be 2900 goto out;
d5d531cb 2901 }
557c44be 2902
2ea2352e
WW		 2903 /* RTF_CACHE is an internal flag; can not be set by userspace */
2904 if (cfg->fc_flags & RTF_CACHE) {
2905 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE");
2906 goto out;
2907 }
2908
e8478e80
DA		 2909 if (cfg->fc_type > RTN_MAX) {
2910 NL_SET_ERR_MSG(extack, "Invalid route type");
2911 goto out;
2912 }
2913
d5d531cb
DA		 2914 if (cfg->fc_dst_len > 128) {
2915 NL_SET_ERR_MSG(extack, "Invalid prefix length");
2916 goto out;
2917 }
2918 if (cfg->fc_src_len > 128) {
2919 NL_SET_ERR_MSG(extack, "Invalid source address length");
8c5b83f0 2920 goto out;
d5d531cb 2921 }
1da177e4 2922#ifndef CONFIG_IPV6_SUBTREES
d5d531cb
DA		 2923 if (cfg->fc_src_len) {
2924 NL_SET_ERR_MSG(extack,
2925 "Specifying source address requires IPV6_SUBTREES to be enabled");
8c5b83f0 2926 goto out;
d5d531cb 2927 }
1da177e4 2928#endif
86872cb5 2929 if (cfg->fc_ifindex) {
1da177e4 2930 err = -ENODEV;
5578689a 2931 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 2932 if (!dev)
2933 goto out;
2934 idev = in6_dev_get(dev);
2935 if (!idev)
2936 goto out;
2937 }
2938
86872cb5
TG		 2939 if (cfg->fc_metric == 0)
2940 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 2941
fc1e64e1
DA		 2942 if (cfg->fc_flags & RTNH_F_ONLINK) {
2943 if (!dev) {
2944 NL_SET_ERR_MSG(extack,
2945 "Nexthop device required for onlink");
2946 err = -ENODEV;
2947 goto out;
2948 }
2949
2950 if (!(dev->flags & IFF_UP)) {
2951 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
2952 err = -ENETDOWN;
2953 goto out;
2954 }
2955 }
2956
d71314b4 2957 err = -ENOBUFS;
38308473
DM		 2958 if (cfg->fc_nlinfo.nlh &&
2959 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 2960 table = fib6_get_table(net, cfg->fc_table);
38308473 2961 if (!table) {
f3213831 2962 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 2963 table = fib6_new_table(net, cfg->fc_table);
2964 }
2965 } else {
2966 table = fib6_new_table(net, cfg->fc_table);
2967 }
38308473
DM		 2968
2969 if (!table)
c71099ac 2970 goto out;
c71099ac 2971
93531c67
DA		 2972 err = -ENOMEM;
2973 rt = fib6_info_alloc(gfp_flags);
2974 if (!rt)
1da177e4 2975 goto out;
93531c67 2976
767a2217
DA		 2977 rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len);
2978 if (IS_ERR(rt->fib6_metrics)) {
2979 err = PTR_ERR(rt->fib6_metrics);
fda21d46
ED		 2980 /* Do not leave garbage there. */
2981 rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
767a2217
DA		 2982 goto out;
2983 }
2984
93531c67
DA		 2985 if (cfg->fc_flags & RTF_ADDRCONF)
2986 rt->dst_nocount = true;
1da177e4 2987
1716a961 2988 if (cfg->fc_flags & RTF_EXPIRES)
14895687 2989 fib6_set_expires(rt, jiffies +
1716a961
G		 2990 clock_t_to_jiffies(cfg->fc_expires));
2991 else
14895687 2992 fib6_clean_expires(rt);
1da177e4 2993
86872cb5
TG		 2994 if (cfg->fc_protocol == RTPROT_UNSPEC)
2995 cfg->fc_protocol = RTPROT_BOOT;
93c2fb25 2996 rt->fib6_protocol = cfg->fc_protocol;
86872cb5
TG		 2997
2998 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4 2999
19e42e45
RP		 3000 if (cfg->fc_encap) {
3001 struct lwtunnel_state *lwtstate;
3002
30357d7d 3003 err = lwtunnel_build_state(cfg->fc_encap_type,
127eb7cd 3004 cfg->fc_encap, AF_INET6, cfg,
9ae28727 3005 &lwtstate, extack);
19e42e45
RP		 3006 if (err)
3007 goto out;
5e670d84 3008 rt->fib6_nh.nh_lwtstate = lwtstate_get(lwtstate);
19e42e45
RP		 3009 }
3010
93c2fb25
DA		 3011 ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
3012 rt->fib6_dst.plen = cfg->fc_dst_len;
3013 if (rt->fib6_dst.plen == 128)
3b6761d1 3014 rt->dst_host = true;
e5fd387a 3015
1da177e4 3016#ifdef CONFIG_IPV6_SUBTREES
93c2fb25
DA		 3017 ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len);
3018 rt->fib6_src.plen = cfg->fc_src_len;
1da177e4
LT		 3019#endif
3020
93c2fb25 3021 rt->fib6_metric = cfg->fc_metric;
5e670d84 3022 rt->fib6_nh.nh_weight = 1;
1da177e4 3023
e8478e80 3024 rt->fib6_type = cfg->fc_type;
1da177e4
LT		 3025
3026 /* We cannot add true routes via loopback here,
3027 they would result in kernel looping; promote them to reject routes
3028 */
86872cb5 3029 if ((cfg->fc_flags & RTF_REJECT) ||
38308473
DM		 3030 (dev && (dev->flags & IFF_LOOPBACK) &&
3031 !(addr_type & IPV6_ADDR_LOOPBACK) &&
3032 !(cfg->fc_flags & RTF_LOCAL))) {
1da177e4 3033 /* hold loopback dev/idev if we haven't done so. */
5578689a 3034 if (dev != net->loopback_dev) {
1da177e4
LT		 3035 if (dev) {
3036 dev_put(dev);
3037 in6_dev_put(idev);
3038 }
5578689a 3039 dev = net->loopback_dev;
1da177e4
LT		 3040 dev_hold(dev);
3041 idev = in6_dev_get(dev);
3042 if (!idev) {
3043 err = -ENODEV;
3044 goto out;
3045 }
3046 }
93c2fb25 3047 rt->fib6_flags = RTF_REJECT|RTF_NONEXTHOP;
1da177e4
LT		 3048 goto install_route;
3049 }
3050
86872cb5 3051 if (cfg->fc_flags & RTF_GATEWAY) {
9fbb704c
DA		 3052 err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
3053 if (err)
48ed7b26 3054 goto out;
1da177e4 3055
93531c67 3056 rt->fib6_nh.nh_gw = cfg->fc_gateway;
1da177e4
LT		 3057 }
3058
3059 err = -ENODEV;
38308473 3060 if (!dev)
1da177e4
LT		 3061 goto out;
3062
428604fb
LB		 3063 if (idev->cnf.disable_ipv6) {
3064 NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
3065 err = -EACCES;
3066 goto out;
3067 }
3068
955ec4cb
DA		 3069 if (!(dev->flags & IFF_UP)) {
3070 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3071 err = -ENETDOWN;
3072 goto out;
3073 }
3074
c3968a85
DW		 3075 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
3076 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
d5d531cb 3077 NL_SET_ERR_MSG(extack, "Invalid source address");
c3968a85
DW		 3078 err = -EINVAL;
3079 goto out;
3080 }
93c2fb25
DA		 3081 rt->fib6_prefsrc.addr = cfg->fc_prefsrc;
3082 rt->fib6_prefsrc.plen = 128;
c3968a85 3083 } else
93c2fb25 3084 rt->fib6_prefsrc.plen = 0;
c3968a85 3085
93c2fb25 3086 rt->fib6_flags = cfg->fc_flags;
1da177e4
LT		 3087
3088install_route:
93c2fb25 3089 if (!(rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
5609b80a 3090 !netif_carrier_ok(dev))
5e670d84
DA		 3091 rt->fib6_nh.nh_flags |= RTNH_F_LINKDOWN;
3092 rt->fib6_nh.nh_flags |= (cfg->fc_flags & RTNH_F_ONLINK);
93531c67 3093 rt->fib6_nh.nh_dev = dev;
93c2fb25 3094 rt->fib6_table = table;
63152fc0 3095
dcd1f572
DA		 3096 if (idev)
3097 in6_dev_put(idev);
3098
8c5b83f0 3099 return rt;
6b9ea5a6
RP		 3100out:
3101 if (dev)
3102 dev_put(dev);
3103 if (idev)
3104 in6_dev_put(idev);
6b9ea5a6 3105
93531c67 3106 fib6_info_release(rt);
8c5b83f0 3107 return ERR_PTR(err);
6b9ea5a6
RP		 3108}
3109
acb54e3c 3110int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
333c4301 3111 struct netlink_ext_ack *extack)
6b9ea5a6 3112{
8d1c802b 3113 struct fib6_info *rt;
6b9ea5a6
RP		 3114 int err;
3115
acb54e3c 3116 rt = ip6_route_info_create(cfg, gfp_flags, extack);
d4ead6b3
DA		 3117 if (IS_ERR(rt))
3118 return PTR_ERR(rt);
6b9ea5a6 3119
d4ead6b3 3120 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack);
93531c67 3121 fib6_info_release(rt);
6b9ea5a6 3122
1da177e4
LT		 3123 return err;
3124}
3125
8d1c802b 3126static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
1da177e4 3127{
afb1d4b5 3128 struct net *net = info->nl_net;
c71099ac 3129 struct fib6_table *table;
afb1d4b5 3130 int err;
1da177e4 3131
421842ed 3132 if (rt == net->ipv6.fib6_null_entry) {
6825a26c
G		 3133 err = -ENOENT;
3134 goto out;
3135 }
6c813a72 3136
93c2fb25 3137 table = rt->fib6_table;
66f5d6ce 3138 spin_lock_bh(&table->tb6_lock);
86872cb5 3139 err = fib6_del(rt, info);
66f5d6ce 3140 spin_unlock_bh(&table->tb6_lock);
1da177e4 3141
6825a26c 3142out:
93531c67 3143 fib6_info_release(rt);
1da177e4
LT		 3144 return err;
3145}
3146
8d1c802b 3147int ip6_del_rt(struct net *net, struct fib6_info *rt)
e0a1ad73 3148{
afb1d4b5
DA		 3149 struct nl_info info = { .nl_net = net };
3150
528c4ceb 3151 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 3152}
3153
8d1c802b 3154static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
0ae81335
DA		 3155{
3156 struct nl_info *info = &cfg->fc_nlinfo;
e3330039 3157 struct net *net = info->nl_net;
16a16cd3 3158 struct sk_buff *skb = NULL;
0ae81335 3159 struct fib6_table *table;
e3330039 3160 int err = -ENOENT;
0ae81335 3161
421842ed 3162 if (rt == net->ipv6.fib6_null_entry)
e3330039 3163 goto out_put;
93c2fb25 3164 table = rt->fib6_table;
66f5d6ce 3165 spin_lock_bh(&table->tb6_lock);
0ae81335 3166
93c2fb25 3167 if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) {
8d1c802b 3168 struct fib6_info *sibling, *next_sibling;
0ae81335 3169
16a16cd3
DA		 3170 /* prefer to send a single notification with all hops */
3171 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3172 if (skb) {
3173 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3174
d4ead6b3 3175 if (rt6_fill_node(net, skb, rt, NULL,
16a16cd3
DA		 3176 NULL, NULL, 0, RTM_DELROUTE,
3177 info->portid, seq, 0) < 0) {
3178 kfree_skb(skb);
3179 skb = NULL;
3180 } else
3181 info->skip_notify = 1;
3182 }
3183
0ae81335 3184 list_for_each_entry_safe(sibling, next_sibling,
93c2fb25
DA		 3185 &rt->fib6_siblings,
3186 fib6_siblings) {
0ae81335
DA		 3187 err = fib6_del(sibling, info);
3188 if (err)
e3330039 3189 goto out_unlock;
0ae81335
DA		 3190 }
3191 }
3192
3193 err = fib6_del(rt, info);
e3330039 3194out_unlock:
66f5d6ce 3195 spin_unlock_bh(&table->tb6_lock);
e3330039 3196out_put:
93531c67 3197 fib6_info_release(rt);
16a16cd3
DA		 3198
3199 if (skb) {
e3330039 3200 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
16a16cd3
DA		 3201 info->nlh, gfp_any());
3202 }
0ae81335
DA		 3203 return err;
3204}
3205
23fb93a4
DA		 3206static int ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
3207{
3208 int rc = -ESRCH;
3209
3210 if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex)
3211 goto out;
3212
3213 if (cfg->fc_flags & RTF_GATEWAY &&
3214 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
3215 goto out;
761f6026
XL		 3216
3217 rc = rt6_remove_exception_rt(rt);
23fb93a4
DA		 3218out:
3219 return rc;
3220}
3221
333c4301
DA		 3222static int ip6_route_del(struct fib6_config *cfg,
3223 struct netlink_ext_ack *extack)
1da177e4 3224{
8d1c802b 3225 struct rt6_info *rt_cache;
c71099ac 3226 struct fib6_table *table;
8d1c802b 3227 struct fib6_info *rt;
1da177e4 3228 struct fib6_node *fn;
1da177e4
LT		 3229 int err = -ESRCH;
3230
5578689a 3231 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
d5d531cb
DA		 3232 if (!table) {
3233 NL_SET_ERR_MSG(extack, "FIB table does not exist");
c71099ac 3234 return err;
d5d531cb 3235 }
c71099ac 3236
66f5d6ce 3237 rcu_read_lock();
1da177e4 3238
c71099ac 3239 fn = fib6_locate(&table->tb6_root,
86872cb5 3240 &cfg->fc_dst, cfg->fc_dst_len,
38fbeeee 3241 &cfg->fc_src, cfg->fc_src_len,
2b760fcf 3242 !(cfg->fc_flags & RTF_CACHE));
1ab1457c 3243
1da177e4 3244 if (fn) {
66f5d6ce 3245 for_each_fib6_node_rt_rcu(fn) {
2b760fcf 3246 if (cfg->fc_flags & RTF_CACHE) {
23fb93a4
DA		 3247 int rc;
3248
2b760fcf
WW		 3249 rt_cache = rt6_find_cached_rt(rt, &cfg->fc_dst,
3250 &cfg->fc_src);
23fb93a4
DA		 3251 if (rt_cache) {
3252 rc = ip6_del_cached_rt(rt_cache, cfg);
9e575010
ED		 3253 if (rc != -ESRCH) {
3254 rcu_read_unlock();
23fb93a4 3255 return rc;
9e575010 3256 }
23fb93a4
DA		 3257 }
3258 continue;
2b760fcf 3259 }
86872cb5 3260 if (cfg->fc_ifindex &&
5e670d84
DA		 3261 (!rt->fib6_nh.nh_dev ||
3262 rt->fib6_nh.nh_dev->ifindex != cfg->fc_ifindex))
1da177e4 3263 continue;
86872cb5 3264 if (cfg->fc_flags & RTF_GATEWAY &&
5e670d84 3265 !ipv6_addr_equal(&cfg->fc_gateway, &rt->fib6_nh.nh_gw))
1da177e4 3266 continue;
93c2fb25 3267 if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric)
1da177e4 3268 continue;
93c2fb25 3269 if (cfg->fc_protocol && cfg->fc_protocol != rt->fib6_protocol)
c2ed1880 3270 continue;
e873e4b9
WW		 3271 if (!fib6_info_hold_safe(rt))
3272 continue;
66f5d6ce 3273 rcu_read_unlock();
1da177e4 3274
0ae81335
DA		 3275 /* if gateway was specified only delete the one hop */
3276 if (cfg->fc_flags & RTF_GATEWAY)
3277 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
3278
3279 return __ip6_del_rt_siblings(rt, cfg);
1da177e4
LT		 3280 }
3281 }
66f5d6ce 3282 rcu_read_unlock();
1da177e4
LT		 3283
3284 return err;
3285}
3286
6700c270 3287static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 3288{
a6279458 3289 struct netevent_redirect netevent;
e8599ff4 3290 struct rt6_info *rt, *nrt = NULL;
e8599ff4
DM		 3291 struct ndisc_options ndopts;
3292 struct inet6_dev *in6_dev;
3293 struct neighbour *neigh;
a68886a6 3294 struct fib6_info *from;
71bcdba0 3295 struct rd_msg *msg;
6e157b6a
DM		 3296 int optlen, on_link;
3297 u8 *lladdr;
e8599ff4 3298
29a3cad5 3299 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 3300 optlen -= sizeof(*msg);
e8599ff4
DM		 3301
3302 if (optlen < 0) {
6e157b6a 3303 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 3304 return;
3305 }
3306
71bcdba0 3307 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 3308
71bcdba0 3309 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 3310 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 3311 return;
3312 }
3313
6e157b6a 3314 on_link = 0;
71bcdba0 3315 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 3316 on_link = 1;
71bcdba0 3317 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 3318 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 3319 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 3320 return;
3321 }
3322
3323 in6_dev = __in6_dev_get(skb->dev);
3324 if (!in6_dev)
3325 return;
3326 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
3327 return;
3328
3329 /* RFC2461 8.1:
3330 * The IP source address of the Redirect MUST be the same as the current
3331 * first-hop router for the specified ICMP Destination Address.
3332 */
3333
f997c55c 3334 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 3335 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
3336 return;
3337 }
6e157b6a
DM		 3338
3339 lladdr = NULL;
e8599ff4
DM		 3340 if (ndopts.nd_opts_tgt_lladdr) {
3341 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
3342 skb->dev);
3343 if (!lladdr) {
3344 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
3345 return;
3346 }
3347 }
3348
6e157b6a 3349 rt = (struct rt6_info *) dst;
ec13ad1d 3350 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 3351 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 3352 return;
6e157b6a 3353 }
e8599ff4 3354
6e157b6a
DM		 3355 /* Redirect received -> path was valid.
3356 * Look, redirects are sent only in response to data packets,
3357 * so that this nexthop apparently is reachable. --ANK
3358 */
0dec879f 3359 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
a6279458 3360
71bcdba0 3361 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 3362 if (!neigh)
3363 return;
a6279458 3364
1da177e4
LT		 3365 /*
3366 * We have finally decided to accept it.
3367 */
3368
f997c55c 3369 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1da177e4
LT		 3370 NEIGH_UPDATE_F_WEAK_OVERRIDE|
3371 NEIGH_UPDATE_F_OVERRIDE|
3372 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
f997c55c
AA		 3373 NEIGH_UPDATE_F_ISROUTER)),
3374 NDISC_REDIRECT, &ndopts);
1da177e4 3375
4d85cd0c 3376 rcu_read_lock();
a68886a6 3377 from = rcu_dereference(rt->from);
e873e4b9
WW		 3378 /* This fib6_info_hold() is safe here because we hold reference to rt
3379 * and rt already holds reference to fib6_info.
3380 */
8a14e46f 3381 fib6_info_hold(from);
4d85cd0c 3382 rcu_read_unlock();
8a14e46f
DA		 3383
3384 nrt = ip6_rt_cache_alloc(from, &msg->dest, NULL);
38308473 3385 if (!nrt)
1da177e4
LT		 3386 goto out;
3387
3388 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
3389 if (on_link)
3390 nrt->rt6i_flags &= ~RTF_GATEWAY;
3391
4e3fd7a0 3392 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 3393
2b760fcf
WW		 3394 /* No need to remove rt from the exception table if rt is
3395 * a cached route because rt6_insert_exception() will
3396 * takes care of it
3397 */
8a14e46f 3398 if (rt6_insert_exception(nrt, from)) {
2b760fcf
WW		 3399 dst_release_immediate(&nrt->dst);
3400 goto out;
3401 }
1da177e4 3402
d8d1f30b
CG		 3403 netevent.old = &rt->dst;
3404 netevent.new = &nrt->dst;
71bcdba0 3405 netevent.daddr = &msg->dest;
60592833 3406 netevent.neigh = neigh;
8d71740c
TT		 3407 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
3408
1da177e4 3409out:
8a14e46f 3410 fib6_info_release(from);
e8599ff4 3411 neigh_release(neigh);
6e157b6a
DM		 3412}
3413
70ceb4f5 3414#ifdef CONFIG_IPV6_ROUTE_INFO
8d1c802b 3415static struct fib6_info *rt6_get_route_info(struct net *net,
b71d1d42 3416 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 3417 const struct in6_addr *gwaddr,
3418 struct net_device *dev)
70ceb4f5 3419{
830218c1
DA		 3420 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
3421 int ifindex = dev->ifindex;
70ceb4f5 3422 struct fib6_node *fn;
8d1c802b 3423 struct fib6_info *rt = NULL;
c71099ac
TG		 3424 struct fib6_table *table;
3425
830218c1 3426 table = fib6_get_table(net, tb_id);
38308473 3427 if (!table)
c71099ac 3428 return NULL;
70ceb4f5 3429
66f5d6ce 3430 rcu_read_lock();
38fbeeee 3431 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true);
70ceb4f5
YH		 3432 if (!fn)
3433 goto out;
3434
66f5d6ce 3435 for_each_fib6_node_rt_rcu(fn) {
5e670d84 3436 if (rt->fib6_nh.nh_dev->ifindex != ifindex)
70ceb4f5 3437 continue;
93c2fb25 3438 if ((rt->fib6_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
70ceb4f5 3439 continue;
5e670d84 3440 if (!ipv6_addr_equal(&rt->fib6_nh.nh_gw, gwaddr))
70ceb4f5 3441 continue;
e873e4b9
WW		 3442 if (!fib6_info_hold_safe(rt))
3443 continue;
70ceb4f5
YH		 3444 break;
3445 }
3446out:
66f5d6ce 3447 rcu_read_unlock();
70ceb4f5
YH		 3448 return rt;
3449}
3450
8d1c802b 3451static struct fib6_info *rt6_add_route_info(struct net *net,
b71d1d42 3452 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 3453 const struct in6_addr *gwaddr,
3454 struct net_device *dev,
95c96174 3455 unsigned int pref)
70ceb4f5 3456{
86872cb5 3457 struct fib6_config cfg = {
238fc7ea 3458 .fc_metric = IP6_RT_PRIO_USER,
830218c1 3459 .fc_ifindex = dev->ifindex,
86872cb5
TG		 3460 .fc_dst_len = prefixlen,
3461 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
3462 RTF_UP | RTF_PREF(pref),
b91d5329 3463 .fc_protocol = RTPROT_RA,
e8478e80 3464 .fc_type = RTN_UNICAST,
15e47304 3465 .fc_nlinfo.portid = 0,
efa2cea0
DL		 3466 .fc_nlinfo.nlh = NULL,
3467 .fc_nlinfo.nl_net = net,
86872cb5
TG		 3468 };
3469
830218c1 3470 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
4e3fd7a0
AD		 3471 cfg.fc_dst = *prefix;
3472 cfg.fc_gateway = *gwaddr;
70ceb4f5 3473
e317da96
YH		 3474 /* We should treat it as a default route if prefix length is 0. */
3475 if (!prefixlen)
86872cb5 3476 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 3477
acb54e3c 3478 ip6_route_add(&cfg, GFP_ATOMIC, NULL);
70ceb4f5 3479
830218c1 3480 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
70ceb4f5
YH		 3481}
3482#endif
3483
8d1c802b 3484struct fib6_info *rt6_get_dflt_router(struct net *net,
afb1d4b5
DA		 3485 const struct in6_addr *addr,
3486 struct net_device *dev)
1ab1457c 3487{
830218c1 3488 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
8d1c802b 3489 struct fib6_info *rt;
c71099ac 3490 struct fib6_table *table;
1da177e4 3491
afb1d4b5 3492 table = fib6_get_table(net, tb_id);
38308473 3493 if (!table)
c71099ac 3494 return NULL;
1da177e4 3495
66f5d6ce
WW		 3496 rcu_read_lock();
3497 for_each_fib6_node_rt_rcu(&table->tb6_root) {
5e670d84 3498 if (dev == rt->fib6_nh.nh_dev &&
93c2fb25 3499 ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
5e670d84 3500 ipv6_addr_equal(&rt->fib6_nh.nh_gw, addr))
1da177e4
LT		 3501 break;
3502 }
e873e4b9
WW		 3503 if (rt && !fib6_info_hold_safe(rt))
3504 rt = NULL;
66f5d6ce 3505 rcu_read_unlock();
1da177e4
LT		 3506 return rt;
3507}
3508
8d1c802b 3509struct fib6_info *rt6_add_dflt_router(struct net *net,
afb1d4b5 3510 const struct in6_addr *gwaddr,
ebacaaa0
YH		 3511 struct net_device *dev,
3512 unsigned int pref)
1da177e4 3513{
86872cb5 3514 struct fib6_config cfg = {
ca254490 3515 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
238fc7ea 3516 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 3517 .fc_ifindex = dev->ifindex,
3518 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
3519 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
b91d5329 3520 .fc_protocol = RTPROT_RA,
e8478e80 3521 .fc_type = RTN_UNICAST,
15e47304 3522 .fc_nlinfo.portid = 0,
5578689a 3523 .fc_nlinfo.nlh = NULL,
afb1d4b5 3524 .fc_nlinfo.nl_net = net,
86872cb5 3525 };
1da177e4 3526
4e3fd7a0 3527 cfg.fc_gateway = *gwaddr;
1da177e4 3528
acb54e3c 3529 if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) {
830218c1
DA		 3530 struct fib6_table *table;
3531
3532 table = fib6_get_table(dev_net(dev), cfg.fc_table);
3533 if (table)
3534 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
3535 }
1da177e4 3536
afb1d4b5 3537 return rt6_get_dflt_router(net, gwaddr, dev);
1da177e4
LT		 3538}
3539
afb1d4b5
DA		 3540static void __rt6_purge_dflt_routers(struct net *net,
3541 struct fib6_table *table)
1da177e4 3542{
8d1c802b 3543 struct fib6_info *rt;
1da177e4
LT		 3544
3545restart:
66f5d6ce
WW		 3546 rcu_read_lock();
3547 for_each_fib6_node_rt_rcu(&table->tb6_root) {
dcd1f572
DA		 3548 struct net_device *dev = fib6_info_nh_dev(rt);
3549 struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL;
3550
93c2fb25 3551 if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
e873e4b9
WW		 3552 (!idev || idev->cnf.accept_ra != 2) &&
3553 fib6_info_hold_safe(rt)) {
93531c67
DA		 3554 rcu_read_unlock();
3555 ip6_del_rt(net, rt);
1da177e4
LT		 3556 goto restart;
3557 }
3558 }
66f5d6ce 3559 rcu_read_unlock();
830218c1
DA		 3560
3561 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
3562}
3563
3564void rt6_purge_dflt_routers(struct net *net)
3565{
3566 struct fib6_table *table;
3567 struct hlist_head *head;
3568 unsigned int h;
3569
3570 rcu_read_lock();
3571
3572 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
3573 head = &net->ipv6.fib_table_hash[h];
3574 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
3575 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
afb1d4b5 3576 __rt6_purge_dflt_routers(net, table);
830218c1
DA		 3577 }
3578 }
3579
3580 rcu_read_unlock();
1da177e4
LT		 3581}
3582
5578689a
DL		 3583static void rtmsg_to_fib6_config(struct net *net,
3584 struct in6_rtmsg *rtmsg,
86872cb5
TG		 3585 struct fib6_config *cfg)
3586{
8823a3ac
MŻ		 3587 *cfg = (struct fib6_config){
3588 .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
3589 : RT6_TABLE_MAIN,
3590 .fc_ifindex = rtmsg->rtmsg_ifindex,
3591 .fc_metric = rtmsg->rtmsg_metric,
3592 .fc_expires = rtmsg->rtmsg_info,
3593 .fc_dst_len = rtmsg->rtmsg_dst_len,
3594 .fc_src_len = rtmsg->rtmsg_src_len,
3595 .fc_flags = rtmsg->rtmsg_flags,
3596 .fc_type = rtmsg->rtmsg_type,
3597
3598 .fc_nlinfo.nl_net = net,
3599
3600 .fc_dst = rtmsg->rtmsg_dst,
3601 .fc_src = rtmsg->rtmsg_src,
3602 .fc_gateway = rtmsg->rtmsg_gateway,
3603 };
86872cb5
TG		 3604}
3605
5578689a 3606int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 3607{
86872cb5 3608 struct fib6_config cfg;
1da177e4
LT		 3609 struct in6_rtmsg rtmsg;
3610 int err;
3611
67ba4152 3612 switch (cmd) {
1da177e4
LT		 3613 case SIOCADDRT: /* Add a route */
3614 case SIOCDELRT: /* Delete a route */
af31f412 3615 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 3616 return -EPERM;
3617 err = copy_from_user(&rtmsg, arg,
3618 sizeof(struct in6_rtmsg));
3619 if (err)
3620 return -EFAULT;
86872cb5 3621
5578689a 3622 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 3623
1da177e4
LT		 3624 rtnl_lock();
3625 switch (cmd) {
3626 case SIOCADDRT:
acb54e3c 3627 err = ip6_route_add(&cfg, GFP_KERNEL, NULL);
1da177e4
LT		 3628 break;
3629 case SIOCDELRT:
333c4301 3630 err = ip6_route_del(&cfg, NULL);
1da177e4
LT		 3631 break;
3632 default:
3633 err = -EINVAL;
3634 }
3635 rtnl_unlock();
3636
3637 return err;
3ff50b79 3638 }
1da177e4
LT		 3639
3640 return -EINVAL;
3641}
3642
3643/*
3644 * Drop the packet on the floor
3645 */
3646
d5fdd6ba 3647static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 3648{
612f09e8 3649 int type;
adf30907 3650 struct dst_entry *dst = skb_dst(skb);
612f09e8
YH		 3651 switch (ipstats_mib_noroutes) {
3652 case IPSTATS_MIB_INNOROUTES:
0660e03f 3653 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 3654 if (type == IPV6_ADDR_ANY) {
bdb7cc64
SS		 3655 IP6_INC_STATS(dev_net(dst->dev),
3656 __in6_dev_get_safely(skb->dev),
3bd653c8 3657 IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 3658 break;
3659 }
3660 /* FALLTHROUGH */
3661 case IPSTATS_MIB_OUTNOROUTES:
3bd653c8
DL		 3662 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
3663 ipstats_mib_noroutes);
612f09e8
YH		 3664 break;
3665 }
3ffe533c 3666 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 3667 kfree_skb(skb);
3668 return 0;
3669}
3670
9ce8ade0
TG		 3671static int ip6_pkt_discard(struct sk_buff *skb)
3672{
612f09e8 3673 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 3674}
3675
ede2059d 3676static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 3677{
adf30907 3678 skb->dev = skb_dst(skb)->dev;
612f09e8 3679 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 3680}
3681
9ce8ade0
TG		 3682static int ip6_pkt_prohibit(struct sk_buff *skb)
3683{
612f09e8 3684 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 3685}
3686
ede2059d 3687static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 3688{
adf30907 3689 skb->dev = skb_dst(skb)->dev;
612f09e8 3690 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 3691}
3692
1da177e4
LT		 3693/*
3694 * Allocate a dst for local (unicast / anycast) address.
3695 */
3696
360a9887
DA		 3697struct fib6_info *addrconf_f6i_alloc(struct net *net,
3698 struct inet6_dev *idev,
3699 const struct in6_addr *addr,
3700 bool anycast, gfp_t gfp_flags)
1da177e4 3701{
ca254490 3702 u32 tb_id;
4832c30d 3703 struct net_device *dev = idev->dev;
360a9887 3704 struct fib6_info *f6i;
5f02ce24 3705
360a9887
DA		 3706 f6i = fib6_info_alloc(gfp_flags);
3707 if (!f6i)
1da177e4
LT		 3708 return ERR_PTR(-ENOMEM);
3709
767a2217 3710 f6i->fib6_metrics = ip_fib_metrics_init(net, NULL, 0);
360a9887 3711 f6i->dst_nocount = true;
360a9887
DA		 3712 f6i->dst_host = true;
3713 f6i->fib6_protocol = RTPROT_KERNEL;
3714 f6i->fib6_flags = RTF_UP | RTF_NONEXTHOP;
e8478e80 3715 if (anycast) {
360a9887
DA		 3716 f6i->fib6_type = RTN_ANYCAST;
3717 f6i->fib6_flags |= RTF_ANYCAST;
e8478e80 3718 } else {
360a9887
DA		 3719 f6i->fib6_type = RTN_LOCAL;
3720 f6i->fib6_flags |= RTF_LOCAL;
e8478e80 3721 }
1da177e4 3722
360a9887 3723 f6i->fib6_nh.nh_gw = *addr;
93531c67 3724 dev_hold(dev);
360a9887
DA		 3725 f6i->fib6_nh.nh_dev = dev;
3726 f6i->fib6_dst.addr = *addr;
3727 f6i->fib6_dst.plen = 128;
ca254490 3728 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
360a9887 3729 f6i->fib6_table = fib6_get_table(net, tb_id);
1da177e4 3730
360a9887 3731 return f6i;
1da177e4
LT		 3732}
3733
c3968a85
DW		 3734/* remove deleted ip from prefsrc entries */
3735struct arg_dev_net_ip {
3736 struct net_device *dev;
3737 struct net *net;
3738 struct in6_addr *addr;
3739};
3740
8d1c802b 3741static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg)
c3968a85
DW		 3742{
3743 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
3744 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
3745 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
3746
5e670d84 3747 if (((void *)rt->fib6_nh.nh_dev == dev || !dev) &&
421842ed 3748 rt != net->ipv6.fib6_null_entry &&
93c2fb25 3749 ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) {
60006a48 3750 spin_lock_bh(&rt6_exception_lock);
c3968a85 3751 /* remove prefsrc entry */
93c2fb25 3752 rt->fib6_prefsrc.plen = 0;
60006a48 3753 spin_unlock_bh(&rt6_exception_lock);
c3968a85
DW		 3754 }
3755 return 0;
3756}
3757
3758void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
3759{
3760 struct net *net = dev_net(ifp->idev->dev);
3761 struct arg_dev_net_ip adni = {
3762 .dev = ifp->idev->dev,
3763 .net = net,
3764 .addr = &ifp->addr,
3765 };
0c3584d5 3766 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 3767}
3768
be7a010d 3769#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
be7a010d
DJ		 3770
3771/* Remove routers and update dst entries when gateway turn into host. */
8d1c802b 3772static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
be7a010d
DJ		 3773{
3774 struct in6_addr *gateway = (struct in6_addr *)arg;
3775
93c2fb25 3776 if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
5e670d84 3777 ipv6_addr_equal(gateway, &rt->fib6_nh.nh_gw)) {
be7a010d
DJ		 3778 return -1;
3779 }
b16cb459
WW		 3780
3781 /* Further clean up cached routes in exception table.
3782 * This is needed because cached route may have a different
3783 * gateway than its 'parent' in the case of an ip redirect.
3784 */
3785 rt6_exceptions_clean_tohost(rt, gateway);
3786
be7a010d
DJ		 3787 return 0;
3788}
3789
3790void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
3791{
3792 fib6_clean_all(net, fib6_clean_tohost, gateway);
3793}
3794
2127d95a
IS		 3795struct arg_netdev_event {
3796 const struct net_device *dev;
4c981e28
IS		 3797 union {
3798 unsigned int nh_flags;
3799 unsigned long event;
3800 };
2127d95a
IS		 3801};
3802
8d1c802b 3803static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt)
d7dedee1 3804{
8d1c802b 3805 struct fib6_info *iter;
d7dedee1
IS		 3806 struct fib6_node *fn;
3807
93c2fb25
DA		 3808 fn = rcu_dereference_protected(rt->fib6_node,
3809 lockdep_is_held(&rt->fib6_table->tb6_lock));
d7dedee1 3810 iter = rcu_dereference_protected(fn->leaf,
93c2fb25 3811 lockdep_is_held(&rt->fib6_table->tb6_lock));
d7dedee1 3812 while (iter) {
93c2fb25 3813 if (iter->fib6_metric == rt->fib6_metric &&
33bd5ac5 3814 rt6_qualify_for_ecmp(iter))
d7dedee1 3815 return iter;
8fb11a9a 3816 iter = rcu_dereference_protected(iter->fib6_next,
93c2fb25 3817 lockdep_is_held(&rt->fib6_table->tb6_lock));
d7dedee1
IS		 3818 }
3819
3820 return NULL;
3821}
3822
8d1c802b 3823static bool rt6_is_dead(const struct fib6_info *rt)
d7dedee1 3824{
5e670d84
DA		 3825 if (rt->fib6_nh.nh_flags & RTNH_F_DEAD ||
3826 (rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN &&
dcd1f572 3827 fib6_ignore_linkdown(rt)))
d7dedee1
IS		 3828 return true;
3829
3830 return false;
3831}
3832
8d1c802b 3833static int rt6_multipath_total_weight(const struct fib6_info *rt)
d7dedee1 3834{
8d1c802b 3835 struct fib6_info *iter;
d7dedee1
IS		 3836 int total = 0;
3837
3838 if (!rt6_is_dead(rt))
5e670d84 3839 total += rt->fib6_nh.nh_weight;
d7dedee1 3840
93c2fb25 3841 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
d7dedee1 3842 if (!rt6_is_dead(iter))
5e670d84 3843 total += iter->fib6_nh.nh_weight;
d7dedee1
IS		 3844 }
3845
3846 return total;
3847}
3848
8d1c802b 3849static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total)
d7dedee1
IS		 3850{
3851 int upper_bound = -1;
3852
3853 if (!rt6_is_dead(rt)) {
5e670d84 3854 *weight += rt->fib6_nh.nh_weight;
d7dedee1
IS		 3855 upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
3856 total) - 1;
3857 }
5e670d84 3858 atomic_set(&rt->fib6_nh.nh_upper_bound, upper_bound);
d7dedee1
IS		 3859}
3860
8d1c802b 3861static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total)
d7dedee1 3862{
8d1c802b 3863 struct fib6_info *iter;
d7dedee1
IS		 3864 int weight = 0;
3865
3866 rt6_upper_bound_set(rt, &weight, total);
3867
93c2fb25 3868 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
d7dedee1
IS		 3869 rt6_upper_bound_set(iter, &weight, total);
3870}
3871
8d1c802b 3872void rt6_multipath_rebalance(struct fib6_info *rt)
d7dedee1 3873{
8d1c802b 3874 struct fib6_info *first;
d7dedee1
IS		 3875 int total;
3876
3877 /* In case the entire multipath route was marked for flushing,
3878 * then there is no need to rebalance upon the removal of every
3879 * sibling route.
3880 */
93c2fb25 3881 if (!rt->fib6_nsiblings || rt->should_flush)
d7dedee1
IS		 3882 return;
3883
3884 /* During lookup routes are evaluated in order, so we need to
3885 * make sure upper bounds are assigned from the first sibling
3886 * onwards.
3887 */
3888 first = rt6_multipath_first_sibling(rt);
3889 if (WARN_ON_ONCE(!first))
3890 return;
3891
3892 total = rt6_multipath_total_weight(first);
3893 rt6_multipath_upper_bound_set(first, total);
3894}
3895
8d1c802b 3896static int fib6_ifup(struct fib6_info *rt, void *p_arg)
2127d95a
IS		 3897{
3898 const struct arg_netdev_event *arg = p_arg;
7aef6859 3899 struct net *net = dev_net(arg->dev);
2127d95a 3900
421842ed 3901 if (rt != net->ipv6.fib6_null_entry && rt->fib6_nh.nh_dev == arg->dev) {
5e670d84 3902 rt->fib6_nh.nh_flags &= ~arg->nh_flags;
7aef6859 3903 fib6_update_sernum_upto_root(net, rt);
d7dedee1 3904 rt6_multipath_rebalance(rt);
1de178ed 3905 }
2127d95a
IS		 3906
3907 return 0;
3908}
3909
3910void rt6_sync_up(struct net_device *dev, unsigned int nh_flags)
3911{
3912 struct arg_netdev_event arg = {
3913 .dev = dev,
6802f3ad
IS		 3914 {
3915 .nh_flags = nh_flags,
3916 },
2127d95a
IS		 3917 };
3918
3919 if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev))
3920 arg.nh_flags |= RTNH_F_LINKDOWN;
3921
3922 fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
3923}
3924
8d1c802b 3925static bool rt6_multipath_uses_dev(const struct fib6_info *rt,
1de178ed
IS		 3926 const struct net_device *dev)
3927{
8d1c802b 3928 struct fib6_info *iter;
1de178ed 3929
5e670d84 3930 if (rt->fib6_nh.nh_dev == dev)
1de178ed 3931 return true;
93c2fb25 3932 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
5e670d84 3933 if (iter->fib6_nh.nh_dev == dev)
1de178ed
IS		 3934 return true;
3935
3936 return false;
3937}
3938
8d1c802b 3939static void rt6_multipath_flush(struct fib6_info *rt)
1de178ed 3940{
8d1c802b 3941 struct fib6_info *iter;
1de178ed
IS		 3942
3943 rt->should_flush = 1;
93c2fb25 3944 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
1de178ed
IS		 3945 iter->should_flush = 1;
3946}
3947
8d1c802b 3948static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
1de178ed
IS		 3949 const struct net_device *down_dev)
3950{
8d1c802b 3951 struct fib6_info *iter;
1de178ed
IS		 3952 unsigned int dead = 0;
3953
5e670d84
DA		 3954 if (rt->fib6_nh.nh_dev == down_dev ||
3955 rt->fib6_nh.nh_flags & RTNH_F_DEAD)
1de178ed 3956 dead++;
93c2fb25 3957 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
5e670d84
DA		 3958 if (iter->fib6_nh.nh_dev == down_dev ||
3959 iter->fib6_nh.nh_flags & RTNH_F_DEAD)
1de178ed
IS		 3960 dead++;
3961
3962 return dead;
3963}
3964
8d1c802b 3965static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
1de178ed
IS		 3966 const struct net_device *dev,
3967 unsigned int nh_flags)
3968{
8d1c802b 3969 struct fib6_info *iter;
1de178ed 3970
5e670d84
DA		 3971 if (rt->fib6_nh.nh_dev == dev)
3972 rt->fib6_nh.nh_flags |= nh_flags;
93c2fb25 3973 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
5e670d84
DA		 3974 if (iter->fib6_nh.nh_dev == dev)
3975 iter->fib6_nh.nh_flags |= nh_flags;
1de178ed
IS		 3976}
3977
a1a22c12 3978/* called with write lock held for table with rt */
8d1c802b 3979static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
1da177e4 3980{
4c981e28
IS		 3981 const struct arg_netdev_event *arg = p_arg;
3982 const struct net_device *dev = arg->dev;
7aef6859 3983 struct net *net = dev_net(dev);
8ed67789 3984
421842ed 3985 if (rt == net->ipv6.fib6_null_entry)
27c6fa73
IS		 3986 return 0;
3987
3988 switch (arg->event) {
3989 case NETDEV_UNREGISTER:
5e670d84 3990 return rt->fib6_nh.nh_dev == dev ? -1 : 0;
27c6fa73 3991 case NETDEV_DOWN:
1de178ed 3992 if (rt->should_flush)
27c6fa73 3993 return -1;
93c2fb25 3994 if (!rt->fib6_nsiblings)
5e670d84 3995 return rt->fib6_nh.nh_dev == dev ? -1 : 0;
1de178ed
IS		 3996 if (rt6_multipath_uses_dev(rt, dev)) {
3997 unsigned int count;
3998
3999 count = rt6_multipath_dead_count(rt, dev);
93c2fb25 4000 if (rt->fib6_nsiblings + 1 == count) {
1de178ed
IS		 4001 rt6_multipath_flush(rt);
4002 return -1;
4003 }
4004 rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD |
4005 RTNH_F_LINKDOWN);
7aef6859 4006 fib6_update_sernum(net, rt);
d7dedee1 4007 rt6_multipath_rebalance(rt);
1de178ed
IS		 4008 }
4009 return -2;
27c6fa73 4010 case NETDEV_CHANGE:
5e670d84 4011 if (rt->fib6_nh.nh_dev != dev ||
93c2fb25 4012 rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST))
27c6fa73 4013 break;
5e670d84 4014 rt->fib6_nh.nh_flags |= RTNH_F_LINKDOWN;
d7dedee1 4015 rt6_multipath_rebalance(rt);
27c6fa73 4016 break;
2b241361 4017 }
c159d30c 4018
1da177e4
LT		 4019 return 0;
4020}
4021
27c6fa73 4022void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
1da177e4 4023{
4c981e28 4024 struct arg_netdev_event arg = {
8ed67789 4025 .dev = dev,
6802f3ad
IS		 4026 {
4027 .event = event,
4028 },
8ed67789 4029 };
7c6bb7d2 4030 struct net *net = dev_net(dev);
8ed67789 4031
7c6bb7d2
DA		 4032 if (net->ipv6.sysctl.skip_notify_on_dev_down)
4033 fib6_clean_all_skip_notify(net, fib6_ifdown, &arg);
4034 else
4035 fib6_clean_all(net, fib6_ifdown, &arg);
4c981e28
IS		 4036}
4037
4038void rt6_disable_ip(struct net_device *dev, unsigned long event)
4039{
4040 rt6_sync_down_dev(dev, event);
4041 rt6_uncached_list_flush_dev(dev_net(dev), dev);
4042 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 4043}
4044
95c96174 4045struct rt6_mtu_change_arg {
1da177e4 4046 struct net_device *dev;
95c96174 4047 unsigned int mtu;
1da177e4
LT		 4048};
4049
8d1c802b 4050static int rt6_mtu_change_route(struct fib6_info *rt, void *p_arg)
1da177e4
LT		 4051{
4052 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
4053 struct inet6_dev *idev;
4054
4055 /* In IPv6 pmtu discovery is not optional,
4056 so that RTAX_MTU lock cannot disable it.
4057 We still use this lock to block changes
4058 caused by addrconf/ndisc.
4059 */
4060
4061 idev = __in6_dev_get(arg->dev);
38308473 4062 if (!idev)
1da177e4
LT		 4063 return 0;
4064
4065 /* For administrative MTU increase, there is no way to discover
4066 IPv6 PMTU increase, so PMTU increase should be updated here.
4067 Since RFC 1981 doesn't include administrative MTU increase
4068 update PMTU increase is a MUST. (i.e. jumbo frame)
4069 */
5e670d84 4070 if (rt->fib6_nh.nh_dev == arg->dev &&
d4ead6b3
DA		 4071 !fib6_metric_locked(rt, RTAX_MTU)) {
4072 u32 mtu = rt->fib6_pmtu;
4073
4074 if (mtu >= arg->mtu ||
4075 (mtu < arg->mtu && mtu == idev->cnf.mtu6))
4076 fib6_metric_set(rt, RTAX_MTU, arg->mtu);
4077
f5bbe7ee 4078 spin_lock_bh(&rt6_exception_lock);
e9fa1495 4079 rt6_exceptions_update_pmtu(idev, rt, arg->mtu);
f5bbe7ee 4080 spin_unlock_bh(&rt6_exception_lock);
566cfd8f 4081 }
1da177e4
LT		 4082 return 0;
4083}
4084
95c96174 4085void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 4086{
c71099ac
TG		 4087 struct rt6_mtu_change_arg arg = {
4088 .dev = dev,
4089 .mtu = mtu,
4090 };
1da177e4 4091
0c3584d5 4092 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 4093}
4094
ef7c79ed 4095static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 4096 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
aa8f8778 4097 [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) },
86872cb5 4098 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 4099 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 4100 [RTA_PRIORITY] = { .type = NLA_U32 },
4101 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 4102 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 4103 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 4104 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
4105 [RTA_ENCAP] = { .type = NLA_NESTED },
32bc201e 4106 [RTA_EXPIRES] = { .type = NLA_U32 },
622ec2c9 4107 [RTA_UID] = { .type = NLA_U32 },
3b45a410 4108 [RTA_MARK] = { .type = NLA_U32 },
aa8f8778 4109 [RTA_TABLE] = { .type = NLA_U32 },
eacb9384
RP		 4110 [RTA_IP_PROTO] = { .type = NLA_U8 },
4111 [RTA_SPORT] = { .type = NLA_U16 },
4112 [RTA_DPORT] = { .type = NLA_U16 },
86872cb5
TG		 4113};
4114
4115static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
333c4301
DA		 4116 struct fib6_config *cfg,
4117 struct netlink_ext_ack *extack)
1da177e4 4118{
86872cb5
TG		 4119 struct rtmsg *rtm;
4120 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 4121 unsigned int pref;
86872cb5 4122 int err;
1da177e4 4123
fceb6435 4124 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
dac9c979 4125 extack);
86872cb5
TG		 4126 if (err < 0)
4127 goto errout;
1da177e4 4128
86872cb5
TG		 4129 err = -EINVAL;
4130 rtm = nlmsg_data(nlh);
86872cb5 4131
84db8407
MŻ		 4132 *cfg = (struct fib6_config){
4133 .fc_table = rtm->rtm_table,
4134 .fc_dst_len = rtm->rtm_dst_len,
4135 .fc_src_len = rtm->rtm_src_len,
4136 .fc_flags = RTF_UP,
4137 .fc_protocol = rtm->rtm_protocol,
4138 .fc_type = rtm->rtm_type,
4139
4140 .fc_nlinfo.portid = NETLINK_CB(skb).portid,
4141 .fc_nlinfo.nlh = nlh,
4142 .fc_nlinfo.nl_net = sock_net(skb->sk),
4143 };
86872cb5 4144
ef2c7d7b
ND		 4145 if (rtm->rtm_type == RTN_UNREACHABLE ||
4146 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 4147 rtm->rtm_type == RTN_PROHIBIT ||
4148 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 4149 cfg->fc_flags |= RTF_REJECT;
4150
ab79ad14
MŻ		 4151 if (rtm->rtm_type == RTN_LOCAL)
4152 cfg->fc_flags |= RTF_LOCAL;
4153
1f56a01f
MKL		 4154 if (rtm->rtm_flags & RTM_F_CLONED)
4155 cfg->fc_flags |= RTF_CACHE;
4156
fc1e64e1
DA		 4157 cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK);
4158
86872cb5 4159 if (tb[RTA_GATEWAY]) {
67b61f6c 4160 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 4161 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 4162 }
86872cb5
TG		 4163
4164 if (tb[RTA_DST]) {
4165 int plen = (rtm->rtm_dst_len + 7) >> 3;
4166
4167 if (nla_len(tb[RTA_DST]) < plen)
4168 goto errout;
4169
4170 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 4171 }
86872cb5
TG		 4172
4173 if (tb[RTA_SRC]) {
4174 int plen = (rtm->rtm_src_len + 7) >> 3;
4175
4176 if (nla_len(tb[RTA_SRC]) < plen)
4177 goto errout;
4178
4179 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 4180 }
86872cb5 4181
c3968a85 4182 if (tb[RTA_PREFSRC])
67b61f6c 4183 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 4184
86872cb5
TG		 4185 if (tb[RTA_OIF])
4186 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
4187
4188 if (tb[RTA_PRIORITY])
4189 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
4190
4191 if (tb[RTA_METRICS]) {
4192 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
4193 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 4194 }
86872cb5
TG		 4195
4196 if (tb[RTA_TABLE])
4197 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
4198
51ebd318
ND		 4199 if (tb[RTA_MULTIPATH]) {
4200 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
4201 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
9ed59592
DA		 4202
4203 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
c255bd68 4204 cfg->fc_mp_len, extack);
9ed59592
DA		 4205 if (err < 0)
4206 goto errout;
51ebd318
ND		 4207 }
4208
c78ba6d6
LR		 4209 if (tb[RTA_PREF]) {
4210 pref = nla_get_u8(tb[RTA_PREF]);
4211 if (pref != ICMPV6_ROUTER_PREF_LOW &&
4212 pref != ICMPV6_ROUTER_PREF_HIGH)
4213 pref = ICMPV6_ROUTER_PREF_MEDIUM;
4214 cfg->fc_flags |= RTF_PREF(pref);
4215 }
4216
19e42e45
RP		 4217 if (tb[RTA_ENCAP])
4218 cfg->fc_encap = tb[RTA_ENCAP];
4219
9ed59592 4220 if (tb[RTA_ENCAP_TYPE]) {
19e42e45
RP		 4221 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
4222
c255bd68 4223 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
9ed59592
DA		 4224 if (err < 0)
4225 goto errout;
4226 }
4227
32bc201e
XL		 4228 if (tb[RTA_EXPIRES]) {
4229 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
4230
4231 if (addrconf_finite_timeout(timeout)) {
4232 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
4233 cfg->fc_flags |= RTF_EXPIRES;
4234 }
4235 }
4236
86872cb5
TG		 4237 err = 0;
4238errout:
4239 return err;
1da177e4
LT		 4240}
4241
6b9ea5a6 4242struct rt6_nh {
8d1c802b 4243 struct fib6_info *fib6_info;
6b9ea5a6 4244 struct fib6_config r_cfg;
6b9ea5a6
RP		 4245 struct list_head next;
4246};
4247
4248static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
4249{
4250 struct rt6_nh *nh;
4251
4252 list_for_each_entry(nh, rt6_nh_list, next) {
7d4d5065 4253 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6c nexthop %pI6c ifi %d\n",
6b9ea5a6
RP		 4254 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
4255 nh->r_cfg.fc_ifindex);
4256 }
4257}
4258
d4ead6b3
DA		 4259static int ip6_route_info_append(struct net *net,
4260 struct list_head *rt6_nh_list,
8d1c802b
DA		 4261 struct fib6_info *rt,
4262 struct fib6_config *r_cfg)
6b9ea5a6
RP		 4263{
4264 struct rt6_nh *nh;
6b9ea5a6
RP		 4265 int err = -EEXIST;
4266
4267 list_for_each_entry(nh, rt6_nh_list, next) {
8d1c802b
DA		 4268 /* check if fib6_info already exists */
4269 if (rt6_duplicate_nexthop(nh->fib6_info, rt))
6b9ea5a6
RP		 4270 return err;
4271 }
4272
4273 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
4274 if (!nh)
4275 return -ENOMEM;
8d1c802b 4276 nh->fib6_info = rt;
6b9ea5a6
RP		 4277 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
4278 list_add_tail(&nh->next, rt6_nh_list);
4279
4280 return 0;
4281}
4282
8d1c802b
DA		 4283static void ip6_route_mpath_notify(struct fib6_info *rt,
4284 struct fib6_info *rt_last,
3b1137fe
DA		 4285 struct nl_info *info,
4286 __u16 nlflags)
4287{
4288 /* if this is an APPEND route, then rt points to the first route
4289 * inserted and rt_last points to last route inserted. Userspace
4290 * wants a consistent dump of the route which starts at the first
4291 * nexthop. Since sibling routes are always added at the end of
4292 * the list, find the first sibling of the last route appended
4293 */
93c2fb25
DA		 4294 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) {
4295 rt = list_first_entry(&rt_last->fib6_siblings,
8d1c802b 4296 struct fib6_info,
93c2fb25 4297 fib6_siblings);
3b1137fe
DA		 4298 }
4299
4300 if (rt)
4301 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
4302}
4303
333c4301
DA		 4304static int ip6_route_multipath_add(struct fib6_config *cfg,
4305 struct netlink_ext_ack *extack)
51ebd318 4306{
8d1c802b 4307 struct fib6_info *rt_notif = NULL, *rt_last = NULL;
3b1137fe 4308 struct nl_info *info = &cfg->fc_nlinfo;
51ebd318
ND		 4309 struct fib6_config r_cfg;
4310 struct rtnexthop *rtnh;
8d1c802b 4311 struct fib6_info *rt;
6b9ea5a6
RP		 4312 struct rt6_nh *err_nh;
4313 struct rt6_nh *nh, *nh_safe;
3b1137fe 4314 __u16 nlflags;
51ebd318
ND		 4315 int remaining;
4316 int attrlen;
6b9ea5a6
RP		 4317 int err = 1;
4318 int nhn = 0;
4319 int replace = (cfg->fc_nlinfo.nlh &&
4320 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
4321 LIST_HEAD(rt6_nh_list);
51ebd318 4322
3b1137fe
DA		 4323 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
4324 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
4325 nlflags |= NLM_F_APPEND;
4326
35f1b4e9 4327 remaining = cfg->fc_mp_len;
51ebd318 4328 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 4329
6b9ea5a6 4330 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
8d1c802b 4331 * fib6_info structs per nexthop
6b9ea5a6 4332 */
51ebd318
ND		 4333 while (rtnh_ok(rtnh, remaining)) {
4334 memcpy(&r_cfg, cfg, sizeof(*cfg));
4335 if (rtnh->rtnh_ifindex)
4336 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
4337
4338 attrlen = rtnh_attrlen(rtnh);
4339 if (attrlen > 0) {
4340 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
4341
4342 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
4343 if (nla) {
67b61f6c 4344 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 4345 r_cfg.fc_flags |= RTF_GATEWAY;
4346 }
19e42e45
RP		 4347 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
4348 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
4349 if (nla)
4350 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 4351 }
6b9ea5a6 4352
68e2ffde 4353 r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK);
acb54e3c 4354 rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack);
8c5b83f0
RP		 4355 if (IS_ERR(rt)) {
4356 err = PTR_ERR(rt);
4357 rt = NULL;
6b9ea5a6 4358 goto cleanup;
8c5b83f0 4359 }
b5d2d75e
DA		 4360 if (!rt6_qualify_for_ecmp(rt)) {
4361 err = -EINVAL;
4362 NL_SET_ERR_MSG(extack,
4363 "Device only routes can not be added for IPv6 using the multipath API.");
4364 fib6_info_release(rt);
4365 goto cleanup;
4366 }
6b9ea5a6 4367
5e670d84 4368 rt->fib6_nh.nh_weight = rtnh->rtnh_hops + 1;
398958ae 4369
d4ead6b3
DA		 4370 err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
4371 rt, &r_cfg);
51ebd318 4372 if (err) {
93531c67 4373 fib6_info_release(rt);
6b9ea5a6
RP		 4374 goto cleanup;
4375 }
4376
4377 rtnh = rtnh_next(rtnh, &remaining);
4378 }
4379
3b1137fe
DA		 4380 /* for add and replace send one notification with all nexthops.
4381 * Skip the notification in fib6_add_rt2node and send one with
4382 * the full route when done
4383 */
4384 info->skip_notify = 1;
4385
6b9ea5a6
RP		 4386 err_nh = NULL;
4387 list_for_each_entry(nh, &rt6_nh_list, next) {
8d1c802b
DA		 4388 err = __ip6_ins_rt(nh->fib6_info, info, extack);
4389 fib6_info_release(nh->fib6_info);
93531c67 4390
f7225172
DA		 4391 if (!err) {
4392 /* save reference to last route successfully inserted */
4393 rt_last = nh->fib6_info;
4394
4395 /* save reference to first route for notification */
4396 if (!rt_notif)
4397 rt_notif = nh->fib6_info;
4398 }
3b1137fe 4399
8d1c802b
DA		 4400 /* nh->fib6_info is used or freed at this point, reset to NULL*/
4401 nh->fib6_info = NULL;
6b9ea5a6
RP		 4402 if (err) {
4403 if (replace && nhn)
4404 ip6_print_replace_route_err(&rt6_nh_list);
4405 err_nh = nh;
4406 goto add_errout;
51ebd318 4407 }
6b9ea5a6 4408
1a72418b 4409 /* Because each route is added like a single route we remove
27596472
MK		 4410 * these flags after the first nexthop: if there is a collision,
4411 * we have already failed to add the first nexthop:
4412 * fib6_add_rt2node() has rejected it; when replacing, old
4413 * nexthops have been replaced by first new, the rest should
4414 * be added to it.
1a72418b 4415 */
27596472
MK		 4416 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
4417 NLM_F_REPLACE);
6b9ea5a6
RP		 4418 nhn++;
4419 }
4420
3b1137fe
DA		 4421 /* success ... tell user about new route */
4422 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
6b9ea5a6
RP		 4423 goto cleanup;
4424
4425add_errout:
3b1137fe
DA		 4426 /* send notification for routes that were added so that
4427 * the delete notifications sent by ip6_route_del are
4428 * coherent
4429 */
4430 if (rt_notif)
4431 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
4432
6b9ea5a6
RP		 4433 /* Delete routes that were already added */
4434 list_for_each_entry(nh, &rt6_nh_list, next) {
4435 if (err_nh == nh)
4436 break;
333c4301 4437 ip6_route_del(&nh->r_cfg, extack);
6b9ea5a6
RP		 4438 }
4439
4440cleanup:
4441 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
8d1c802b
DA		 4442 if (nh->fib6_info)
4443 fib6_info_release(nh->fib6_info);
6b9ea5a6
RP		 4444 list_del(&nh->next);
4445 kfree(nh);
4446 }
4447
4448 return err;
4449}
4450
333c4301
DA		 4451static int ip6_route_multipath_del(struct fib6_config *cfg,
4452 struct netlink_ext_ack *extack)
6b9ea5a6
RP		 4453{
4454 struct fib6_config r_cfg;
4455 struct rtnexthop *rtnh;
4456 int remaining;
4457 int attrlen;
4458 int err = 1, last_err = 0;
4459
4460 remaining = cfg->fc_mp_len;
4461 rtnh = (struct rtnexthop *)cfg->fc_mp;
4462
4463 /* Parse a Multipath Entry */
4464 while (rtnh_ok(rtnh, remaining)) {
4465 memcpy(&r_cfg, cfg, sizeof(*cfg));
4466 if (rtnh->rtnh_ifindex)
4467 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
4468
4469 attrlen = rtnh_attrlen(rtnh);
4470 if (attrlen > 0) {
4471 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
4472
4473 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
4474 if (nla) {
4475 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
4476 r_cfg.fc_flags |= RTF_GATEWAY;
4477 }
4478 }
333c4301 4479 err = ip6_route_del(&r_cfg, extack);
6b9ea5a6
RP		 4480 if (err)
4481 last_err = err;
4482
51ebd318
ND		 4483 rtnh = rtnh_next(rtnh, &remaining);
4484 }
4485
4486 return last_err;
4487}
4488
c21ef3e3
DA		 4489static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
4490 struct netlink_ext_ack *extack)
1da177e4 4491{
86872cb5
TG		 4492 struct fib6_config cfg;
4493 int err;
1da177e4 4494
333c4301 4495 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
86872cb5
TG		 4496 if (err < 0)
4497 return err;
4498
51ebd318 4499 if (cfg.fc_mp)
333c4301 4500 return ip6_route_multipath_del(&cfg, extack);
0ae81335
DA		 4501 else {
4502 cfg.fc_delete_all_nh = 1;
333c4301 4503 return ip6_route_del(&cfg, extack);
0ae81335 4504 }
1da177e4
LT		 4505}
4506
c21ef3e3
DA		 4507static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
4508 struct netlink_ext_ack *extack)
1da177e4 4509{
86872cb5
TG		 4510 struct fib6_config cfg;
4511 int err;
1da177e4 4512
333c4301 4513 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
86872cb5
TG		 4514 if (err < 0)
4515 return err;
4516
51ebd318 4517 if (cfg.fc_mp)
333c4301 4518 return ip6_route_multipath_add(&cfg, extack);
51ebd318 4519 else
acb54e3c 4520 return ip6_route_add(&cfg, GFP_KERNEL, extack);
1da177e4
LT		 4521}
4522
8d1c802b 4523static size_t rt6_nlmsg_size(struct fib6_info *rt)
339bf98f 4524{
beb1afac
DA		 4525 int nexthop_len = 0;
4526
93c2fb25 4527 if (rt->fib6_nsiblings) {
beb1afac
DA		 4528 nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */
4529 + NLA_ALIGN(sizeof(struct rtnexthop))
4530 + nla_total_size(16) /* RTA_GATEWAY */
5e670d84 4531 + lwtunnel_get_encap_size(rt->fib6_nh.nh_lwtstate);
beb1afac 4532
93c2fb25 4533 nexthop_len *= rt->fib6_nsiblings;
beb1afac
DA		 4534 }
4535
339bf98f
TG		 4536 return NLMSG_ALIGN(sizeof(struct rtmsg))
4537 + nla_total_size(16) /* RTA_SRC */
4538 + nla_total_size(16) /* RTA_DST */
4539 + nla_total_size(16) /* RTA_GATEWAY */
4540 + nla_total_size(16) /* RTA_PREFSRC */
4541 + nla_total_size(4) /* RTA_TABLE */
4542 + nla_total_size(4) /* RTA_IIF */
4543 + nla_total_size(4) /* RTA_OIF */
4544 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 4545 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 4546 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 4547 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 4548 + nla_total_size(1) /* RTA_PREF */
5e670d84 4549 + lwtunnel_get_encap_size(rt->fib6_nh.nh_lwtstate)
beb1afac
DA		 4550 + nexthop_len;
4551}
4552
8d1c802b 4553static int rt6_nexthop_info(struct sk_buff *skb, struct fib6_info *rt,
5be083ce 4554 unsigned int *flags, bool skip_oif)
beb1afac 4555{
5e670d84 4556 if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
f9d882ea
IS		 4557 *flags |= RTNH_F_DEAD;
4558
5e670d84 4559 if (rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN) {
beb1afac 4560 *flags |= RTNH_F_LINKDOWN;
dcd1f572
DA		 4561
4562 rcu_read_lock();
4563 if (fib6_ignore_linkdown(rt))
beb1afac 4564 *flags |= RTNH_F_DEAD;
dcd1f572 4565 rcu_read_unlock();
beb1afac
DA		 4566 }
4567
93c2fb25 4568 if (rt->fib6_flags & RTF_GATEWAY) {
5e670d84 4569 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->fib6_nh.nh_gw) < 0)
beb1afac
DA		 4570 goto nla_put_failure;
4571 }
4572
5e670d84
DA		 4573 *flags |= (rt->fib6_nh.nh_flags & RTNH_F_ONLINK);
4574 if (rt->fib6_nh.nh_flags & RTNH_F_OFFLOAD)
61e4d01e
IS		 4575 *flags |= RTNH_F_OFFLOAD;
4576
5be083ce 4577 /* not needed for multipath encoding b/c it has a rtnexthop struct */
5e670d84
DA		 4578 if (!skip_oif && rt->fib6_nh.nh_dev &&
4579 nla_put_u32(skb, RTA_OIF, rt->fib6_nh.nh_dev->ifindex))
beb1afac
DA		 4580 goto nla_put_failure;
4581
5e670d84
DA		 4582 if (rt->fib6_nh.nh_lwtstate &&
4583 lwtunnel_fill_encap(skb, rt->fib6_nh.nh_lwtstate) < 0)
beb1afac
DA		 4584 goto nla_put_failure;
4585
4586 return 0;
4587
4588nla_put_failure:
4589 return -EMSGSIZE;
4590}
4591
5be083ce 4592/* add multipath next hop */
8d1c802b 4593static int rt6_add_nexthop(struct sk_buff *skb, struct fib6_info *rt)
beb1afac 4594{
5e670d84 4595 const struct net_device *dev = rt->fib6_nh.nh_dev;
beb1afac
DA		 4596 struct rtnexthop *rtnh;
4597 unsigned int flags = 0;
4598
4599 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
4600 if (!rtnh)
4601 goto nla_put_failure;
4602
5e670d84
DA		 4603 rtnh->rtnh_hops = rt->fib6_nh.nh_weight - 1;
4604 rtnh->rtnh_ifindex = dev ? dev->ifindex : 0;
beb1afac 4605
5be083ce 4606 if (rt6_nexthop_info(skb, rt, &flags, true) < 0)
beb1afac
DA		 4607 goto nla_put_failure;
4608
4609 rtnh->rtnh_flags = flags;
4610
4611 /* length of rtnetlink header + attributes */
4612 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
4613
4614 return 0;
4615
4616nla_put_failure:
4617 return -EMSGSIZE;
339bf98f
TG		 4618}
4619
d4ead6b3 4620static int rt6_fill_node(struct net *net, struct sk_buff *skb,
8d1c802b 4621 struct fib6_info *rt, struct dst_entry *dst,
d4ead6b3 4622 struct in6_addr *dest, struct in6_addr *src,
15e47304 4623 int iif, int type, u32 portid, u32 seq,
f8cfe2ce 4624 unsigned int flags)
1da177e4 4625{
22d0bd82
XL		 4626 struct rt6_info *rt6 = (struct rt6_info *)dst;
4627 struct rt6key *rt6_dst, *rt6_src;
4628 u32 *pmetrics, table, rt6_flags;
2d7202bf 4629 struct nlmsghdr *nlh;
22d0bd82 4630 struct rtmsg *rtm;
d4ead6b3 4631 long expires = 0;
1da177e4 4632
15e47304 4633 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 4634 if (!nlh)
26932566 4635 return -EMSGSIZE;
2d7202bf 4636
22d0bd82
XL		 4637 if (rt6) {
4638 rt6_dst = &rt6->rt6i_dst;
4639 rt6_src = &rt6->rt6i_src;
4640 rt6_flags = rt6->rt6i_flags;
4641 } else {
4642 rt6_dst = &rt->fib6_dst;
4643 rt6_src = &rt->fib6_src;
4644 rt6_flags = rt->fib6_flags;
4645 }
4646
2d7202bf 4647 rtm = nlmsg_data(nlh);
1da177e4 4648 rtm->rtm_family = AF_INET6;
22d0bd82
XL		 4649 rtm->rtm_dst_len = rt6_dst->plen;
4650 rtm->rtm_src_len = rt6_src->plen;
1da177e4 4651 rtm->rtm_tos = 0;
93c2fb25
DA		 4652 if (rt->fib6_table)
4653 table = rt->fib6_table->tb6_id;
c71099ac 4654 else
9e762a4a
PM		 4655 table = RT6_TABLE_UNSPEC;
4656 rtm->rtm_table = table;
c78679e8
DM		 4657 if (nla_put_u32(skb, RTA_TABLE, table))
4658 goto nla_put_failure;
e8478e80
DA		 4659
4660 rtm->rtm_type = rt->fib6_type;
1da177e4
LT		 4661 rtm->rtm_flags = 0;
4662 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
93c2fb25 4663 rtm->rtm_protocol = rt->fib6_protocol;
1da177e4 4664
22d0bd82 4665 if (rt6_flags & RTF_CACHE)
1da177e4
LT		 4666 rtm->rtm_flags |= RTM_F_CLONED;
4667
d4ead6b3
DA		 4668 if (dest) {
4669 if (nla_put_in6_addr(skb, RTA_DST, dest))
c78679e8 4670 goto nla_put_failure;
1ab1457c 4671 rtm->rtm_dst_len = 128;
1da177e4 4672 } else if (rtm->rtm_dst_len)
22d0bd82 4673 if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr))
c78679e8 4674 goto nla_put_failure;
1da177e4
LT		 4675#ifdef CONFIG_IPV6_SUBTREES
4676 if (src) {
930345ea 4677 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 4678 goto nla_put_failure;
1ab1457c 4679 rtm->rtm_src_len = 128;
c78679e8 4680 } else if (rtm->rtm_src_len &&
22d0bd82 4681 nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr))
c78679e8 4682 goto nla_put_failure;
1da177e4 4683#endif
7bc570c8
YH		 4684 if (iif) {
4685#ifdef CONFIG_IPV6_MROUTE
22d0bd82 4686 if (ipv6_addr_is_multicast(&rt6_dst->addr)) {
fd61c6ba
DA		 4687 int err = ip6mr_get_route(net, skb, rtm, portid);
4688
4689 if (err == 0)
4690 return 0;
4691 if (err < 0)
4692 goto nla_put_failure;
7bc570c8
YH		 4693 } else
4694#endif
c78679e8
DM		 4695 if (nla_put_u32(skb, RTA_IIF, iif))
4696 goto nla_put_failure;
d4ead6b3 4697 } else if (dest) {
1da177e4 4698 struct in6_addr saddr_buf;
d4ead6b3 4699 if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 &&
930345ea 4700 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 4701 goto nla_put_failure;
1da177e4 4702 }
2d7202bf 4703
93c2fb25 4704 if (rt->fib6_prefsrc.plen) {
c3968a85 4705 struct in6_addr saddr_buf;
93c2fb25 4706 saddr_buf = rt->fib6_prefsrc.addr;
930345ea 4707 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 4708 goto nla_put_failure;
c3968a85
DW		 4709 }
4710
d4ead6b3
DA		 4711 pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics;
4712 if (rtnetlink_put_metrics(skb, pmetrics) < 0)
2d7202bf
TG		 4713 goto nla_put_failure;
4714
93c2fb25 4715 if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric))
c78679e8 4716 goto nla_put_failure;
8253947e 4717
beb1afac
DA		 4718 /* For multipath routes, walk the siblings list and add
4719 * each as a nexthop within RTA_MULTIPATH.
4720 */
22d0bd82
XL		 4721 if (rt6) {
4722 if (rt6_flags & RTF_GATEWAY &&
4723 nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway))
4724 goto nla_put_failure;
4725
4726 if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex))
4727 goto nla_put_failure;
4728 } else if (rt->fib6_nsiblings) {
8d1c802b 4729 struct fib6_info *sibling, *next_sibling;
beb1afac
DA		 4730 struct nlattr *mp;
4731
4732 mp = nla_nest_start(skb, RTA_MULTIPATH);
4733 if (!mp)
4734 goto nla_put_failure;
4735
4736 if (rt6_add_nexthop(skb, rt) < 0)
4737 goto nla_put_failure;
4738
4739 list_for_each_entry_safe(sibling, next_sibling,
93c2fb25 4740 &rt->fib6_siblings, fib6_siblings) {
beb1afac
DA		 4741 if (rt6_add_nexthop(skb, sibling) < 0)
4742 goto nla_put_failure;
4743 }
4744
4745 nla_nest_end(skb, mp);
4746 } else {
5be083ce 4747 if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags, false) < 0)
beb1afac
DA		 4748 goto nla_put_failure;
4749 }
4750
22d0bd82 4751 if (rt6_flags & RTF_EXPIRES) {
14895687
DA		 4752 expires = dst ? dst->expires : rt->expires;
4753 expires -= jiffies;
4754 }
69cdf8f9 4755
d4ead6b3 4756 if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0)
e3703b3d 4757 goto nla_put_failure;
2d7202bf 4758
22d0bd82 4759 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags)))
c78ba6d6
LR		 4760 goto nla_put_failure;
4761
19e42e45 4762
053c095a
JB		 4763 nlmsg_end(skb, nlh);
4764 return 0;
2d7202bf
TG		 4765
4766nla_put_failure:
26932566
PM		 4767 nlmsg_cancel(skb, nlh);
4768 return -EMSGSIZE;
1da177e4
LT		 4769}
4770
13e38901
DA		 4771static bool fib6_info_uses_dev(const struct fib6_info *f6i,
4772 const struct net_device *dev)
4773{
4774 if (f6i->fib6_nh.nh_dev == dev)
4775 return true;
4776
4777 if (f6i->fib6_nsiblings) {
4778 struct fib6_info *sibling, *next_sibling;
4779
4780 list_for_each_entry_safe(sibling, next_sibling,
4781 &f6i->fib6_siblings, fib6_siblings) {
4782 if (sibling->fib6_nh.nh_dev == dev)
4783 return true;
4784 }
4785 }
4786
4787 return false;
4788}
4789
8d1c802b 4790int rt6_dump_route(struct fib6_info *rt, void *p_arg)
1da177e4
LT		 4791{
4792 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
13e38901
DA		 4793 struct fib_dump_filter *filter = &arg->filter;
4794 unsigned int flags = NLM_F_MULTI;
1f17e2f2
DA		 4795 struct net *net = arg->net;
4796
421842ed 4797 if (rt == net->ipv6.fib6_null_entry)
1f17e2f2 4798 return 0;
1da177e4 4799
13e38901
DA		 4800 if ((filter->flags & RTM_F_PREFIX) &&
4801 !(rt->fib6_flags & RTF_PREFIX_RT)) {
4802 /* success since this is not a prefix route */
4803 return 1;
4804 }
4805 if (filter->filter_set) {
4806 if ((filter->rt_type && rt->fib6_type != filter->rt_type) ||
4807 (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) ||
4808 (filter->protocol && rt->fib6_protocol != filter->protocol)) {
f8cfe2ce
DA		 4809 return 1;
4810 }
13e38901 4811 flags |= NLM_F_DUMP_FILTERED;
f8cfe2ce 4812 }
1da177e4 4813
d4ead6b3
DA		 4814 return rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL, 0,
4815 RTM_NEWROUTE, NETLINK_CB(arg->cb->skb).portid,
13e38901 4816 arg->cb->nlh->nlmsg_seq, flags);
1da177e4
LT		 4817}
4818
c21ef3e3
DA		 4819static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4820 struct netlink_ext_ack *extack)
1da177e4 4821{
3b1e0a65 4822 struct net *net = sock_net(in_skb->sk);
ab364a6f 4823 struct nlattr *tb[RTA_MAX+1];
18c3a61c 4824 int err, iif = 0, oif = 0;
a68886a6 4825 struct fib6_info *from;
18c3a61c 4826 struct dst_entry *dst;
ab364a6f 4827 struct rt6_info *rt;
1da177e4 4828 struct sk_buff *skb;
ab364a6f 4829 struct rtmsg *rtm;
744486d4 4830 struct flowi6 fl6 = {};
18c3a61c 4831 bool fibmatch;
1da177e4 4832
fceb6435 4833 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
c21ef3e3 4834 extack);
ab364a6f
TG		 4835 if (err < 0)
4836 goto errout;
1da177e4 4837
ab364a6f 4838 err = -EINVAL;
38b7097b
HFS		 4839 rtm = nlmsg_data(nlh);
4840 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
18c3a61c 4841 fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
1da177e4 4842
ab364a6f
TG		 4843 if (tb[RTA_SRC]) {
4844 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
4845 goto errout;
4846
4e3fd7a0 4847 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 4848 }
4849
4850 if (tb[RTA_DST]) {
4851 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
4852 goto errout;
4853
4e3fd7a0 4854 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 4855 }
4856
4857 if (tb[RTA_IIF])
4858 iif = nla_get_u32(tb[RTA_IIF]);
4859
4860 if (tb[RTA_OIF])
72331bc0 4861 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 4862
2e47b291
LC		 4863 if (tb[RTA_MARK])
4864 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
4865
622ec2c9
LC		 4866 if (tb[RTA_UID])
4867 fl6.flowi6_uid = make_kuid(current_user_ns(),
4868 nla_get_u32(tb[RTA_UID]));
4869 else
4870 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
4871
eacb9384
RP		 4872 if (tb[RTA_SPORT])
4873 fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]);
4874
4875 if (tb[RTA_DPORT])
4876 fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]);
4877
4878 if (tb[RTA_IP_PROTO]) {
4879 err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
4880 &fl6.flowi6_proto, extack);
4881 if (err)
4882 goto errout;
4883 }
4884
1da177e4
LT		 4885 if (iif) {
4886 struct net_device *dev;
72331bc0
SL		 4887 int flags = 0;
4888
121622db
FW		 4889 rcu_read_lock();
4890
4891 dev = dev_get_by_index_rcu(net, iif);
1da177e4 4892 if (!dev) {
121622db 4893 rcu_read_unlock();
1da177e4 4894 err = -ENODEV;
ab364a6f 4895 goto errout;
1da177e4 4896 }
72331bc0
SL		 4897
4898 fl6.flowi6_iif = iif;
4899
4900 if (!ipv6_addr_any(&fl6.saddr))
4901 flags |= RT6_LOOKUP_F_HAS_SADDR;
4902
b75cc8f9 4903 dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags);
121622db
FW		 4904
4905 rcu_read_unlock();
72331bc0
SL		 4906 } else {
4907 fl6.flowi6_oif = oif;
4908
58acfd71 4909 dst = ip6_route_output(net, NULL, &fl6);
18c3a61c
RP		 4910 }
4911
18c3a61c
RP		 4912
4913 rt = container_of(dst, struct rt6_info, dst);
4914 if (rt->dst.error) {
4915 err = rt->dst.error;
4916 ip6_rt_put(rt);
4917 goto errout;
1da177e4
LT		 4918 }
4919
9d6acb3b
WC		 4920 if (rt == net->ipv6.ip6_null_entry) {
4921 err = rt->dst.error;
4922 ip6_rt_put(rt);
4923 goto errout;
4924 }
4925
ab364a6f 4926 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 4927 if (!skb) {
94e187c0 4928 ip6_rt_put(rt);
ab364a6f
TG		 4929 err = -ENOBUFS;
4930 goto errout;
4931 }
1da177e4 4932
d8d1f30b 4933 skb_dst_set(skb, &rt->dst);
a68886a6
DA		 4934
4935 rcu_read_lock();
4936 from = rcu_dereference(rt->from);
4937
18c3a61c 4938 if (fibmatch)
a68886a6 4939 err = rt6_fill_node(net, skb, from, NULL, NULL, NULL, iif,
18c3a61c
RP		 4940 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
4941 nlh->nlmsg_seq, 0);
4942 else
a68886a6
DA		 4943 err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
4944 &fl6.saddr, iif, RTM_NEWROUTE,
d4ead6b3
DA		 4945 NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
4946 0);
a68886a6
DA		 4947 rcu_read_unlock();
4948
1da177e4 4949 if (err < 0) {
ab364a6f
TG		 4950 kfree_skb(skb);
4951 goto errout;
1da177e4
LT		 4952 }
4953
15e47304 4954 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 4955errout:
1da177e4 4956 return err;
1da177e4
LT		 4957}
4958
8d1c802b 4959void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
37a1d361 4960 unsigned int nlm_flags)
1da177e4
LT		 4961{
4962 struct sk_buff *skb;
5578689a 4963 struct net *net = info->nl_net;
528c4ceb
DL		 4964 u32 seq;
4965 int err;
4966
4967 err = -ENOBUFS;
38308473 4968 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 4969
19e42e45 4970 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 4971 if (!skb)
21713ebc
TG		 4972 goto errout;
4973
d4ead6b3
DA		 4974 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
4975 event, info->portid, seq, nlm_flags);
26932566
PM		 4976 if (err < 0) {
4977 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
4978 WARN_ON(err == -EMSGSIZE);
4979 kfree_skb(skb);
4980 goto errout;
4981 }
15e47304 4982 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 4983 info->nlh, gfp_any());
4984 return;
21713ebc
TG		 4985errout:
4986 if (err < 0)
5578689a 4987 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 4988}
4989
8ed67789 4990static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 4991 unsigned long event, void *ptr)
8ed67789 4992{
351638e7 4993 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 4994 struct net *net = dev_net(dev);
8ed67789 4995
242d3a49
WC		 4996 if (!(dev->flags & IFF_LOOPBACK))
4997 return NOTIFY_OK;
4998
4999 if (event == NETDEV_REGISTER) {
421842ed 5000 net->ipv6.fib6_null_entry->fib6_nh.nh_dev = dev;
d8d1f30b 5001 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 5002 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
5003#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 5004 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 5005 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 5006 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789 5007 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
242d3a49 5008#endif
76da0704
WC		 5009 } else if (event == NETDEV_UNREGISTER &&
5010 dev->reg_state != NETREG_UNREGISTERED) {
5011 /* NETDEV_UNREGISTER could be fired for multiple times by
5012 * netdev_wait_allrefs(). Make sure we only call this once.
5013 */
12d94a80 5014 in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
242d3a49 5015#ifdef CONFIG_IPV6_MULTIPLE_TABLES
12d94a80
ED		 5016 in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
5017 in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
8ed67789
DL		 5018#endif
5019 }
5020
5021 return NOTIFY_OK;
5022}
5023
1da177e4
LT		 5024/*
5025 * /proc
5026 */
5027
5028#ifdef CONFIG_PROC_FS
1da177e4
LT		 5029static int rt6_stats_seq_show(struct seq_file *seq, void *v)
5030{
69ddb805 5031 struct net *net = (struct net *)seq->private;
1da177e4 5032 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 5033 net->ipv6.rt6_stats->fib_nodes,
5034 net->ipv6.rt6_stats->fib_route_nodes,
81eb8447 5035 atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc),
69ddb805
DL		 5036 net->ipv6.rt6_stats->fib_rt_entries,
5037 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 5038 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 5039 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 5040
5041 return 0;
5042}
1da177e4
LT		 5043#endif /* CONFIG_PROC_FS */
5044
5045#ifdef CONFIG_SYSCTL
5046
1da177e4 5047static
fe2c6338 5048int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
1da177e4
LT		 5049 void __user *buffer, size_t *lenp, loff_t *ppos)
5050{
c486da34
LAG		 5051 struct net *net;
5052 int delay;
5053 if (!write)
1da177e4 5054 return -EINVAL;
c486da34
LAG		 5055
5056 net = (struct net *)ctl->extra1;
5057 delay = net->ipv6.sysctl.flush_delay;
5058 proc_dointvec(ctl, write, buffer, lenp, ppos);
2ac3ac8f 5059 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 5060 return 0;
1da177e4
LT		 5061}
5062
7c6bb7d2
DA		 5063static int zero;
5064static int one = 1;
5065
ed792e28 5066static struct ctl_table ipv6_route_table_template[] = {
1ab1457c 5067 {
1da177e4 5068 .procname = "flush",
4990509f 5069 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 5070 .maxlen = sizeof(int),
89c8b3a1 5071 .mode = 0200,
6d9f239a 5072 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 5073 },
5074 {
1da177e4 5075 .procname = "gc_thresh",
9a7ec3a9 5076 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 5077 .maxlen = sizeof(int),
5078 .mode = 0644,
6d9f239a 5079 .proc_handler = proc_dointvec,
1da177e4
LT		 5080 },
5081 {
1da177e4 5082 .procname = "max_size",
4990509f 5083 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 5084 .maxlen = sizeof(int),
5085 .mode = 0644,
6d9f239a 5086 .proc_handler = proc_dointvec,
1da177e4
LT		 5087 },
5088 {
1da177e4 5089 .procname = "gc_min_interval",
4990509f 5090 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 5091 .maxlen = sizeof(int),
5092 .mode = 0644,
6d9f239a 5093 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5094 },
5095 {
1da177e4 5096 .procname = "gc_timeout",
4990509f 5097 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 5098 .maxlen = sizeof(int),
5099 .mode = 0644,
6d9f239a 5100 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5101 },
5102 {
1da177e4 5103 .procname = "gc_interval",
4990509f 5104 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 5105 .maxlen = sizeof(int),
5106 .mode = 0644,
6d9f239a 5107 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5108 },
5109 {
1da177e4 5110 .procname = "gc_elasticity",
4990509f 5111 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 5112 .maxlen = sizeof(int),
5113 .mode = 0644,
f3d3f616 5114 .proc_handler = proc_dointvec,
1da177e4
LT		 5115 },
5116 {
1da177e4 5117 .procname = "mtu_expires",
4990509f 5118 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 5119 .maxlen = sizeof(int),
5120 .mode = 0644,
6d9f239a 5121 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5122 },
5123 {
1da177e4 5124 .procname = "min_adv_mss",
4990509f 5125 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 5126 .maxlen = sizeof(int),
5127 .mode = 0644,
f3d3f616 5128 .proc_handler = proc_dointvec,
1da177e4
LT		 5129 },
5130 {
1da177e4 5131 .procname = "gc_min_interval_ms",
4990509f 5132 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 5133 .maxlen = sizeof(int),
5134 .mode = 0644,
6d9f239a 5135 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 5136 },
7c6bb7d2
DA		 5137 {
5138 .procname = "skip_notify_on_dev_down",
5139 .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down,
5140 .maxlen = sizeof(int),
5141 .mode = 0644,
5142 .proc_handler = proc_dointvec,
5143 .extra1 = &zero,
5144 .extra2 = &one,
5145 },
f8572d8f 5146 { }
1da177e4
LT		 5147};
5148
2c8c1e72 5149struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 5150{
5151 struct ctl_table *table;
5152
5153 table = kmemdup(ipv6_route_table_template,
5154 sizeof(ipv6_route_table_template),
5155 GFP_KERNEL);
5ee09105
YH		 5156
5157 if (table) {
5158 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 5159 table[0].extra1 = net;
86393e52 5160 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 5161 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
5162 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
5163 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
5164 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
5165 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
5166 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
5167 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 5168 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
7c6bb7d2 5169 table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down;
464dc801
EB		 5170
5171 /* Don't export sysctls to unprivileged users */
5172 if (net->user_ns != &init_user_ns)
5173 table[0].procname = NULL;
5ee09105
YH		 5174 }
5175
760f2d01
DL		 5176 return table;
5177}
1da177e4
LT		 5178#endif
5179
2c8c1e72 5180static int __net_init ip6_route_net_init(struct net *net)
cdb18761 5181{
633d424b 5182 int ret = -ENOMEM;
8ed67789 5183
86393e52
AD		 5184 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
5185 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 5186
fc66f95c
ED		 5187 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
5188 goto out_ip6_dst_ops;
5189
421842ed
DA		 5190 net->ipv6.fib6_null_entry = kmemdup(&fib6_null_entry_template,
5191 sizeof(*net->ipv6.fib6_null_entry),
5192 GFP_KERNEL);
5193 if (!net->ipv6.fib6_null_entry)
5194 goto out_ip6_dst_entries;
5195
8ed67789
DL		 5196 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
5197 sizeof(*net->ipv6.ip6_null_entry),
5198 GFP_KERNEL);
5199 if (!net->ipv6.ip6_null_entry)
421842ed 5200 goto out_fib6_null_entry;
d8d1f30b 5201 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 5202 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
5203 ip6_template_metrics, true);
8ed67789
DL		 5204
5205#ifdef CONFIG_IPV6_MULTIPLE_TABLES
feca7d8c 5206 net->ipv6.fib6_has_custom_rules = false;
8ed67789
DL		 5207 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
5208 sizeof(*net->ipv6.ip6_prohibit_entry),
5209 GFP_KERNEL);
68fffc67
PZ		 5210 if (!net->ipv6.ip6_prohibit_entry)
5211 goto out_ip6_null_entry;
d8d1f30b 5212 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 5213 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
5214 ip6_template_metrics, true);
8ed67789
DL		 5215
5216 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
5217 sizeof(*net->ipv6.ip6_blk_hole_entry),
5218 GFP_KERNEL);
68fffc67
PZ		 5219 if (!net->ipv6.ip6_blk_hole_entry)
5220 goto out_ip6_prohibit_entry;
d8d1f30b 5221 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 5222 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
5223 ip6_template_metrics, true);
8ed67789
DL		 5224#endif
5225
b339a47c
PZ		 5226 net->ipv6.sysctl.flush_delay = 0;
5227 net->ipv6.sysctl.ip6_rt_max_size = 4096;
5228 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
5229 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
5230 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
5231 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
5232 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
5233 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
7c6bb7d2 5234 net->ipv6.sysctl.skip_notify_on_dev_down = 0;
b339a47c 5235
6891a346
BT		 5236 net->ipv6.ip6_rt_gc_expire = 30*HZ;
5237
8ed67789
DL		 5238 ret = 0;
5239out:
5240 return ret;
f2fc6a54 5241
68fffc67
PZ		 5242#ifdef CONFIG_IPV6_MULTIPLE_TABLES
5243out_ip6_prohibit_entry:
5244 kfree(net->ipv6.ip6_prohibit_entry);
5245out_ip6_null_entry:
5246 kfree(net->ipv6.ip6_null_entry);
5247#endif
421842ed
DA		 5248out_fib6_null_entry:
5249 kfree(net->ipv6.fib6_null_entry);
fc66f95c
ED		 5250out_ip6_dst_entries:
5251 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 5252out_ip6_dst_ops:
f2fc6a54 5253 goto out;
cdb18761
DL		 5254}
5255
2c8c1e72 5256static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 5257{
421842ed 5258 kfree(net->ipv6.fib6_null_entry);
8ed67789
DL		 5259 kfree(net->ipv6.ip6_null_entry);
5260#ifdef CONFIG_IPV6_MULTIPLE_TABLES
5261 kfree(net->ipv6.ip6_prohibit_entry);
5262 kfree(net->ipv6.ip6_blk_hole_entry);
5263#endif
41bb78b4 5264 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 5265}
5266
d189634e
TG		 5267static int __net_init ip6_route_net_init_late(struct net *net)
5268{
5269#ifdef CONFIG_PROC_FS
c3506372
CH		 5270 proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops,
5271 sizeof(struct ipv6_route_iter));
3617d949
CH		 5272 proc_create_net_single("rt6_stats", 0444, net->proc_net,
5273 rt6_stats_seq_show, NULL);
d189634e
TG		 5274#endif
5275 return 0;
5276}
5277
5278static void __net_exit ip6_route_net_exit_late(struct net *net)
5279{
5280#ifdef CONFIG_PROC_FS
ece31ffd
G		 5281 remove_proc_entry("ipv6_route", net->proc_net);
5282 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 5283#endif
5284}
5285
cdb18761
DL		 5286static struct pernet_operations ip6_route_net_ops = {
5287 .init = ip6_route_net_init,
5288 .exit = ip6_route_net_exit,
5289};
5290
c3426b47
DM		 5291static int __net_init ipv6_inetpeer_init(struct net *net)
5292{
5293 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
5294
5295 if (!bp)
5296 return -ENOMEM;
5297 inet_peer_base_init(bp);
5298 net->ipv6.peers = bp;
5299 return 0;
5300}
5301
5302static void __net_exit ipv6_inetpeer_exit(struct net *net)
5303{
5304 struct inet_peer_base *bp = net->ipv6.peers;
5305
5306 net->ipv6.peers = NULL;
56a6b248 5307 inetpeer_invalidate_tree(bp);
c3426b47
DM		 5308 kfree(bp);
5309}
5310
2b823f72 5311static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 5312 .init = ipv6_inetpeer_init,
5313 .exit = ipv6_inetpeer_exit,
5314};
5315
d189634e
TG		 5316static struct pernet_operations ip6_route_net_late_ops = {
5317 .init = ip6_route_net_init_late,
5318 .exit = ip6_route_net_exit_late,
5319};
5320
8ed67789
DL		 5321static struct notifier_block ip6_route_dev_notifier = {
5322 .notifier_call = ip6_route_dev_notify,
242d3a49 5323 .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
8ed67789
DL		 5324};
5325
2f460933
WC		 5326void __init ip6_route_init_special_entries(void)
5327{
5328 /* Registering of the loopback is done before this portion of code,
5329 * the loopback reference in rt6_info will not be taken, do it
5330 * manually for init_net */
421842ed 5331 init_net.ipv6.fib6_null_entry->fib6_nh.nh_dev = init_net.loopback_dev;
2f460933
WC		 5332 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
5333 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
5334 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
5335 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
5336 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
5337 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
5338 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
5339 #endif
5340}
5341
433d49c3 5342int __init ip6_route_init(void)
1da177e4 5343{
433d49c3 5344 int ret;
8d0b94af 5345 int cpu;
433d49c3 5346
9a7ec3a9
DL		 5347 ret = -ENOMEM;
5348 ip6_dst_ops_template.kmem_cachep =
e5d679f3 5349 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 5350 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 5351 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 5352 goto out;
14e50e57 5353
fc66f95c 5354 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 5355 if (ret)
bdb3289f 5356 goto out_kmem_cache;
bdb3289f 5357
c3426b47
DM		 5358 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
5359 if (ret)
e8803b6c 5360 goto out_dst_entries;
2a0c451a 5361
7e52b33b
DM		 5362 ret = register_pernet_subsys(&ip6_route_net_ops);
5363 if (ret)
5364 goto out_register_inetpeer;
c3426b47 5365
5dc121e9
AE		 5366 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
5367
e8803b6c 5368 ret = fib6_init();
433d49c3 5369 if (ret)
8ed67789 5370 goto out_register_subsys;
433d49c3 5371
433d49c3
DL		 5372 ret = xfrm6_init();
5373 if (ret)
e8803b6c 5374 goto out_fib6_init;
c35b7e72 5375
433d49c3
DL		 5376 ret = fib6_rules_init();
5377 if (ret)
5378 goto xfrm6_init;
7e5449c2 5379
d189634e
TG		 5380 ret = register_pernet_subsys(&ip6_route_net_late_ops);
5381 if (ret)
5382 goto fib6_rules_init;
5383
16feebcf
FW		 5384 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE,
5385 inet6_rtm_newroute, NULL, 0);
5386 if (ret < 0)
5387 goto out_register_late_subsys;
5388
5389 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE,
5390 inet6_rtm_delroute, NULL, 0);
5391 if (ret < 0)
5392 goto out_register_late_subsys;
5393
5394 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE,
5395 inet6_rtm_getroute, NULL,
5396 RTNL_FLAG_DOIT_UNLOCKED);
5397 if (ret < 0)
d189634e 5398 goto out_register_late_subsys;
c127ea2c 5399
8ed67789 5400 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 5401 if (ret)
d189634e 5402 goto out_register_late_subsys;
8ed67789 5403
8d0b94af
MKL		 5404 for_each_possible_cpu(cpu) {
5405 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
5406
5407 INIT_LIST_HEAD(&ul->head);
5408 spin_lock_init(&ul->lock);
5409 }
5410
433d49c3
DL		 5411out:
5412 return ret;
5413
d189634e 5414out_register_late_subsys:
16feebcf 5415 rtnl_unregister_all(PF_INET6);
d189634e 5416 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 5417fib6_rules_init:
433d49c3
DL		 5418 fib6_rules_cleanup();
5419xfrm6_init:
433d49c3 5420 xfrm6_fini();
2a0c451a
TG		 5421out_fib6_init:
5422 fib6_gc_cleanup();
8ed67789
DL		 5423out_register_subsys:
5424 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 5425out_register_inetpeer:
5426 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 5427out_dst_entries:
5428 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 5429out_kmem_cache:
f2fc6a54 5430 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 5431 goto out;
1da177e4
LT		 5432}
5433
5434void ip6_route_cleanup(void)
5435{
8ed67789 5436 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 5437 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 5438 fib6_rules_cleanup();
1da177e4 5439 xfrm6_fini();
1da177e4 5440 fib6_gc_cleanup();
c3426b47 5441 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 5442 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 5443 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 5444 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 5445}
Linux 6.x block layer and io_uring tree(s)