projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
bpf: Add bpf_prog iterator
[linux-block.git] / net / ipv6 / route.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * Linux INET6 implementation
4 * FIB front-end.
5 *
6 * Authors:
1ab1457c 7 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 8 */
9
10/* Changes:
11 *
12 * YOSHIFUJI Hideaki @USAGI
13 * reworked default router selection.
14 * - respect outgoing interface
15 * - select from (probably) reachable routers (i.e.
16 * routers in REACHABLE, STALE, DELAY or PROBE states).
17 * - always select the same router if it is (probably)
18 * reachable. otherwise, round-robin the list.
c0bece9f
YH		 19 * Ville Nuorvala
20 * Fixed routing subtrees.
1da177e4
LT		 21 */
22
f3213831
JP		 23#define pr_fmt(fmt) "IPv6: " fmt
24
4fc268d2 25#include <linux/capability.h>
1da177e4 26#include <linux/errno.h>
bc3b2d7f 27#include <linux/export.h>
1da177e4
LT		 28#include <linux/types.h>
29#include <linux/times.h>
30#include <linux/socket.h>
31#include <linux/sockios.h>
32#include <linux/net.h>
33#include <linux/route.h>
34#include <linux/netdevice.h>
35#include <linux/in6.h>
7bc570c8 36#include <linux/mroute6.h>
1da177e4 37#include <linux/init.h>
1da177e4 38#include <linux/if_arp.h>
1da177e4
LT		 39#include <linux/proc_fs.h>
40#include <linux/seq_file.h>
5b7c931d 41#include <linux/nsproxy.h>
5a0e3ad6 42#include <linux/slab.h>
35732d01 43#include <linux/jhash.h>
457c4cbc 44#include <net/net_namespace.h>
1da177e4
LT		 45#include <net/snmp.h>
46#include <net/ipv6.h>
47#include <net/ip6_fib.h>
48#include <net/ip6_route.h>
49#include <net/ndisc.h>
50#include <net/addrconf.h>
51#include <net/tcp.h>
52#include <linux/rtnetlink.h>
53#include <net/dst.h>
904af04d 54#include <net/dst_metadata.h>
1da177e4 55#include <net/xfrm.h>
8d71740c 56#include <net/netevent.h>
21713ebc 57#include <net/netlink.h>
3c618c1d 58#include <net/rtnh.h>
19e42e45 59#include <net/lwtunnel.h>
904af04d 60#include <net/ip_tunnels.h>
ca254490 61#include <net/l3mdev.h>
eacb9384 62#include <net/ip.h>
7c0f6ba6 63#include <linux/uaccess.h>
951cf368 64#include <linux/btf_ids.h>
1da177e4
LT		 65
66#ifdef CONFIG_SYSCTL
67#include <linux/sysctl.h>
68#endif
69
30d444d3
DA		 70static int ip6_rt_type_to_error(u8 fib6_type);
71
72#define CREATE_TRACE_POINTS
73#include <trace/events/fib6.h>
74EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup);
75#undef CREATE_TRACE_POINTS
76
afc154e9 77enum rt6_nud_state {
7e980569
JB		 78 RT6_NUD_FAIL_HARD = -3,
79 RT6_NUD_FAIL_PROBE = -2,
80 RT6_NUD_FAIL_DO_RR = -1,
afc154e9
HFS		 81 RT6_NUD_SUCCEED = 1
82};
83
1da177e4 84static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
0dbaee3b 85static unsigned int ip6_default_advmss(const struct dst_entry *dst);
ebb762f2 86static unsigned int ip6_mtu(const struct dst_entry *dst);
1da177e4
LT		 87static struct dst_entry *ip6_negative_advice(struct dst_entry *);
88static void ip6_dst_destroy(struct dst_entry *);
89static void ip6_dst_ifdown(struct dst_entry *,
90 struct net_device *dev, int how);
569d3645 91static int ip6_dst_gc(struct dst_ops *ops);
1da177e4
LT		 92
93static int ip6_pkt_discard(struct sk_buff *skb);
ede2059d 94static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
7150aede 95static int ip6_pkt_prohibit(struct sk_buff *skb);
ede2059d 96static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1da177e4 97static void ip6_link_failure(struct sk_buff *skb);
6700c270 98static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
bd085ef6
HL		 99 struct sk_buff *skb, u32 mtu,
100 bool confirm_neigh);
6700c270
DM		 101static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
102 struct sk_buff *skb);
702cea56
DA		 103static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
104 int strict);
a1b7a1f0 105static size_t rt6_nlmsg_size(struct fib6_info *f6i);
d4ead6b3 106static int rt6_fill_node(struct net *net, struct sk_buff *skb,
8d1c802b 107 struct fib6_info *rt, struct dst_entry *dst,
d4ead6b3 108 struct in6_addr *dest, struct in6_addr *src,
16a16cd3
DA		 109 int iif, int type, u32 portid, u32 seq,
110 unsigned int flags);
7e4b5128 111static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
510e2ced
WW		 112 const struct in6_addr *daddr,
113 const struct in6_addr *saddr);
1da177e4 114
70ceb4f5 115#ifdef CONFIG_IPV6_ROUTE_INFO
8d1c802b 116static struct fib6_info *rt6_add_route_info(struct net *net,
b71d1d42 117 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 118 const struct in6_addr *gwaddr,
119 struct net_device *dev,
95c96174 120 unsigned int pref);
8d1c802b 121static struct fib6_info *rt6_get_route_info(struct net *net,
b71d1d42 122 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 123 const struct in6_addr *gwaddr,
124 struct net_device *dev);
70ceb4f5
YH		 125#endif
126
8d0b94af
MKL		 127struct uncached_list {
128 spinlock_t lock;
129 struct list_head head;
130};
131
132static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
133
510c321b 134void rt6_uncached_list_add(struct rt6_info *rt)
8d0b94af
MKL		 135{
136 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
137
8d0b94af
MKL		 138 rt->rt6i_uncached_list = ul;
139
140 spin_lock_bh(&ul->lock);
141 list_add_tail(&rt->rt6i_uncached, &ul->head);
142 spin_unlock_bh(&ul->lock);
143}
144
510c321b 145void rt6_uncached_list_del(struct rt6_info *rt)
8d0b94af
MKL		 146{
147 if (!list_empty(&rt->rt6i_uncached)) {
148 struct uncached_list *ul = rt->rt6i_uncached_list;
81eb8447 149 struct net *net = dev_net(rt->dst.dev);
8d0b94af
MKL		 150
151 spin_lock_bh(&ul->lock);
152 list_del(&rt->rt6i_uncached);
81eb8447 153 atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache);
8d0b94af
MKL		 154 spin_unlock_bh(&ul->lock);
155 }
156}
157
158static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
159{
160 struct net_device *loopback_dev = net->loopback_dev;
161 int cpu;
162
e332bc67
EB		 163 if (dev == loopback_dev)
164 return;
165
8d0b94af
MKL		 166 for_each_possible_cpu(cpu) {
167 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
168 struct rt6_info *rt;
169
170 spin_lock_bh(&ul->lock);
171 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
172 struct inet6_dev *rt_idev = rt->rt6i_idev;
173 struct net_device *rt_dev = rt->dst.dev;
174
e332bc67 175 if (rt_idev->dev == dev) {
8d0b94af
MKL		 176 rt->rt6i_idev = in6_dev_get(loopback_dev);
177 in6_dev_put(rt_idev);
178 }
179
e332bc67 180 if (rt_dev == dev) {
8d7017fd 181 rt->dst.dev = blackhole_netdev;
8d0b94af
MKL		 182 dev_hold(rt->dst.dev);
183 dev_put(rt_dev);
184 }
185 }
186 spin_unlock_bh(&ul->lock);
187 }
188}
189
f8a1b43b 190static inline const void *choose_neigh_daddr(const struct in6_addr *p,
f894cbf8
DM		 191 struct sk_buff *skb,
192 const void *daddr)
39232973 193{
a7563f34 194 if (!ipv6_addr_any(p))
39232973 195 return (const void *) p;
f894cbf8
DM		 196 else if (skb)
197 return &ipv6_hdr(skb)->daddr;
39232973
DM		 198 return daddr;
199}
200
f8a1b43b
DA		 201struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
202 struct net_device *dev,
203 struct sk_buff *skb,
204 const void *daddr)
d3aaeb38 205{
39232973
DM		 206 struct neighbour *n;
207
f8a1b43b
DA		 208 daddr = choose_neigh_daddr(gw, skb, daddr);
209 n = __ipv6_neigh_lookup(dev, daddr);
f83c7790
DM		 210 if (n)
211 return n;
7adf3246
SB		 212
213 n = neigh_create(&nd_tbl, daddr, dev);
214 return IS_ERR(n) ? NULL : n;
f8a1b43b
DA		 215}
216
217static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,
218 struct sk_buff *skb,
219 const void *daddr)
220{
221 const struct rt6_info *rt = container_of(dst, struct rt6_info, dst);
222
2c6b55f4
ND		 223 return ip6_neigh_lookup(rt6_nexthop(rt, &in6addr_any),
224 dst->dev, skb, daddr);
f83c7790
DM		 225}
226
63fca65d
JA		 227static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
228{
229 struct net_device *dev = dst->dev;
230 struct rt6_info *rt = (struct rt6_info *)dst;
231
cbfd6891 232 daddr = choose_neigh_daddr(rt6_nexthop(rt, &in6addr_any), NULL, daddr);
63fca65d
JA		 233 if (!daddr)
234 return;
235 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
236 return;
237 if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
238 return;
239 __ipv6_confirm_neigh(dev, daddr);
240}
241
9a7ec3a9 242static struct dst_ops ip6_dst_ops_template = {
1da177e4 243 .family = AF_INET6,
1da177e4
LT		 244 .gc = ip6_dst_gc,
245 .gc_thresh = 1024,
246 .check = ip6_dst_check,
0dbaee3b 247 .default_advmss = ip6_default_advmss,
ebb762f2 248 .mtu = ip6_mtu,
d4ead6b3 249 .cow_metrics = dst_cow_metrics_generic,
1da177e4
LT		 250 .destroy = ip6_dst_destroy,
251 .ifdown = ip6_dst_ifdown,
252 .negative_advice = ip6_negative_advice,
253 .link_failure = ip6_link_failure,
254 .update_pmtu = ip6_rt_update_pmtu,
6e157b6a 255 .redirect = rt6_do_redirect,
9f8955cc 256 .local_out = __ip6_local_out,
f8a1b43b 257 .neigh_lookup = ip6_dst_neigh_lookup,
63fca65d 258 .confirm_neigh = ip6_confirm_neigh,
1da177e4
LT		 259};
260
ebb762f2 261static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
ec831ea7 262{
618f9bc7
SK		 263 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
264
265 return mtu ? : dst->dev->mtu;
ec831ea7
RD		 266}
267
6700c270 268static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
bd085ef6
HL		 269 struct sk_buff *skb, u32 mtu,
270 bool confirm_neigh)
14e50e57
DM		 271{
272}
273
6700c270
DM		 274static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
275 struct sk_buff *skb)
b587ee3b
DM		 276{
277}
278
14e50e57
DM		 279static struct dst_ops ip6_dst_blackhole_ops = {
280 .family = AF_INET6,
14e50e57
DM		 281 .destroy = ip6_dst_destroy,
282 .check = ip6_dst_check,
ebb762f2 283 .mtu = ip6_blackhole_mtu,
214f45c9 284 .default_advmss = ip6_default_advmss,
14e50e57 285 .update_pmtu = ip6_rt_blackhole_update_pmtu,
b587ee3b 286 .redirect = ip6_rt_blackhole_redirect,
0a1f5962 287 .cow_metrics = dst_cow_metrics_generic,
f8a1b43b 288 .neigh_lookup = ip6_dst_neigh_lookup,
14e50e57
DM		 289};
290
62fa8a84 291static const u32 ip6_template_metrics[RTAX_MAX] = {
14edd87d 292 [RTAX_HOPLIMIT - 1] = 0,
62fa8a84
DM		 293};
294
8d1c802b 295static const struct fib6_info fib6_null_entry_template = {
93c2fb25
DA		 296 .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP),
297 .fib6_protocol = RTPROT_KERNEL,
298 .fib6_metric = ~(u32)0,
f05713e0 299 .fib6_ref = REFCOUNT_INIT(1),
421842ed
DA		 300 .fib6_type = RTN_UNREACHABLE,
301 .fib6_metrics = (struct dst_metrics *)&dst_default_metrics,
302};
303
fb0af4c7 304static const struct rt6_info ip6_null_entry_template = {
d8d1f30b
CG		 305 .dst = {
306 .__refcnt = ATOMIC_INIT(1),
307 .__use = 1,
2c20cbd7 308 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 309 .error = -ENETUNREACH,
d8d1f30b
CG		 310 .input = ip6_pkt_discard,
311 .output = ip6_pkt_discard_out,
1da177e4
LT		 312 },
313 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
1da177e4
LT		 314};
315
101367c2
TG		 316#ifdef CONFIG_IPV6_MULTIPLE_TABLES
317
fb0af4c7 318static const struct rt6_info ip6_prohibit_entry_template = {
d8d1f30b
CG		 319 .dst = {
320 .__refcnt = ATOMIC_INIT(1),
321 .__use = 1,
2c20cbd7 322 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 323 .error = -EACCES,
d8d1f30b
CG		 324 .input = ip6_pkt_prohibit,
325 .output = ip6_pkt_prohibit_out,
101367c2
TG		 326 },
327 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
101367c2
TG		 328};
329
fb0af4c7 330static const struct rt6_info ip6_blk_hole_entry_template = {
d8d1f30b
CG		 331 .dst = {
332 .__refcnt = ATOMIC_INIT(1),
333 .__use = 1,
2c20cbd7 334 .obsolete = DST_OBSOLETE_FORCE_CHK,
d8d1f30b 335 .error = -EINVAL,
d8d1f30b 336 .input = dst_discard,
ede2059d 337 .output = dst_discard_out,
101367c2
TG		 338 },
339 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
101367c2
TG		 340};
341
342#endif
343
ebfa45f0
MKL		 344static void rt6_info_init(struct rt6_info *rt)
345{
346 struct dst_entry *dst = &rt->dst;
347
348 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
ebfa45f0
MKL		 349 INIT_LIST_HEAD(&rt->rt6i_uncached);
350}
351
1da177e4 352/* allocate dst with ip6_dst_ops */
93531c67
DA		 353struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
354 int flags)
1da177e4 355{
97bab73f 356 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
b2a9c0ed 357 1, DST_OBSOLETE_FORCE_CHK, flags);
cf911662 358
81eb8447 359 if (rt) {
ebfa45f0 360 rt6_info_init(rt);
81eb8447
WW		 361 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
362 }
8104891b 363
cf911662 364 return rt;
1da177e4 365}
9ab179d8 366EXPORT_SYMBOL(ip6_dst_alloc);
d52d3997 367
1da177e4
LT		 368static void ip6_dst_destroy(struct dst_entry *dst)
369{
370 struct rt6_info *rt = (struct rt6_info *)dst;
a68886a6 371 struct fib6_info *from;
8d0b94af 372 struct inet6_dev *idev;
1da177e4 373
1620a336 374 ip_dst_metrics_put(dst);
8d0b94af
MKL		 375 rt6_uncached_list_del(rt);
376
377 idev = rt->rt6i_idev;
38308473 378 if (idev) {
1da177e4
LT		 379 rt->rt6i_idev = NULL;
380 in6_dev_put(idev);
1ab1457c 381 }
1716a961 382
0e233874 383 from = xchg((__force struct fib6_info **)&rt->from, NULL);
93531c67 384 fib6_info_release(from);
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
b1d40991
DA		 428void fib6_select_path(const struct net *net, struct fib6_result *res,
429 struct flowi6 *fl6, int oif, bool have_oif_match,
430 const struct sk_buff *skb, int strict)
51ebd318 431{
8d1c802b 432 struct fib6_info *sibling, *next_sibling;
b1d40991
DA		 433 struct fib6_info *match = res->f6i;
434
34fe5a1c 435 if (!match->nh && (!match->fib6_nsiblings || have_oif_match))
b1d40991 436 goto out;
51ebd318 437
34fe5a1c
DA		 438 if (match->nh && have_oif_match && res->nh)
439 return;
440
b673d6cc
JS		 441 /* We might have already computed the hash for ICMPv6 errors. In such
442 * case it will always be non-zero. Otherwise now is the time to do it.
443 */
f88d8ea6
DA		 444 if (!fl6->mp_hash &&
445 (!match->nh || nexthop_is_multipath(match->nh)))
b4bac172 446 fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
b673d6cc 447
f88d8ea6
DA		 448 if (unlikely(match->nh)) {
449 nexthop_path_fib6_result(res, fl6->mp_hash);
450 return;
451 }
452
1cf844c7 453 if (fl6->mp_hash <= atomic_read(&match->fib6_nh->fib_nh_upper_bound))
b1d40991 454 goto out;
3d709f69 455
93c2fb25
DA		 456 list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings,
457 fib6_siblings) {
1cf844c7 458 const struct fib6_nh *nh = sibling->fib6_nh;
5e670d84
DA		 459 int nh_upper_bound;
460
702cea56 461 nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound);
5e670d84 462 if (fl6->mp_hash > nh_upper_bound)
3d709f69 463 continue;
702cea56 464 if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0)
3d709f69
IS		 465 break;
466 match = sibling;
467 break;
468 }
469
b1d40991
DA		 470out:
471 res->f6i = match;
1cf844c7 472 res->nh = match->fib6_nh;
51ebd318
ND		 473}
474
1da177e4 475/*
66f5d6ce 476 * Route lookup. rcu_read_lock() should be held.
1da177e4
LT		 477 */
478
0c59d006
DA		 479static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh,
480 const struct in6_addr *saddr, int oif, int flags)
481{
482 const struct net_device *dev;
483
484 if (nh->fib_nh_flags & RTNH_F_DEAD)
485 return false;
486
487 dev = nh->fib_nh_dev;
488 if (oif) {
489 if (dev->ifindex == oif)
490 return true;
491 } else {
492 if (ipv6_chk_addr(net, saddr, dev,
493 flags & RT6_LOOKUP_F_IFACE))
494 return true;
495 }
496
497 return false;
498}
499
962b6803
DA		 500struct fib6_nh_dm_arg {
501 struct net *net;
502 const struct in6_addr *saddr;
503 int oif;
504 int flags;
505 struct fib6_nh *nh;
506};
507
508static int __rt6_nh_dev_match(struct fib6_nh *nh, void *_arg)
509{
510 struct fib6_nh_dm_arg *arg = _arg;
511
512 arg->nh = nh;
513 return __rt6_device_match(arg->net, nh, arg->saddr, arg->oif,
514 arg->flags);
515}
516
517/* returns fib6_nh from nexthop or NULL */
518static struct fib6_nh *rt6_nh_dev_match(struct net *net, struct nexthop *nh,
519 struct fib6_result *res,
520 const struct in6_addr *saddr,
521 int oif, int flags)
522{
523 struct fib6_nh_dm_arg arg = {
524 .net = net,
525 .saddr = saddr,
526 .oif = oif,
527 .flags = flags,
528 };
529
530 if (nexthop_is_blackhole(nh))
531 return NULL;
532
533 if (nexthop_for_each_fib6_nh(nh, __rt6_nh_dev_match, &arg))
534 return arg.nh;
535
536 return NULL;
537}
538
75ef7389
DA		 539static void rt6_device_match(struct net *net, struct fib6_result *res,
540 const struct in6_addr *saddr, int oif, int flags)
1da177e4 541{
75ef7389
DA		 542 struct fib6_info *f6i = res->f6i;
543 struct fib6_info *spf6i;
544 struct fib6_nh *nh;
1da177e4 545
75ef7389 546 if (!oif && ipv6_addr_any(saddr)) {
f88d8ea6
DA		 547 if (unlikely(f6i->nh)) {
548 nh = nexthop_fib6_nh(f6i->nh);
549 if (nexthop_is_blackhole(f6i->nh))
550 goto out_blackhole;
551 } else {
552 nh = f6i->fib6_nh;
553 }
7d21fec9
DA		 554 if (!(nh->fib_nh_flags & RTNH_F_DEAD))
555 goto out;
75ef7389 556 }
dd3abc4e 557
75ef7389 558 for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) {
962b6803
DA		 559 bool matched = false;
560
561 if (unlikely(spf6i->nh)) {
562 nh = rt6_nh_dev_match(net, spf6i->nh, res, saddr,
563 oif, flags);
564 if (nh)
565 matched = true;
566 } else {
567 nh = spf6i->fib6_nh;
568 if (__rt6_device_match(net, nh, saddr, oif, flags))
569 matched = true;
570 }
571 if (matched) {
75ef7389 572 res->f6i = spf6i;
7d21fec9 573 goto out;
75ef7389 574 }
dd3abc4e 575 }
1da177e4 576
75ef7389
DA		 577 if (oif && flags & RT6_LOOKUP_F_IFACE) {
578 res->f6i = net->ipv6.fib6_null_entry;
1cf844c7 579 nh = res->f6i->fib6_nh;
7d21fec9 580 goto out;
75ef7389 581 }
8067bb8c 582
f88d8ea6
DA		 583 if (unlikely(f6i->nh)) {
584 nh = nexthop_fib6_nh(f6i->nh);
585 if (nexthop_is_blackhole(f6i->nh))
586 goto out_blackhole;
587 } else {
588 nh = f6i->fib6_nh;
589 }
590
7d21fec9 591 if (nh->fib_nh_flags & RTNH_F_DEAD) {
75ef7389 592 res->f6i = net->ipv6.fib6_null_entry;
1cf844c7 593 nh = res->f6i->fib6_nh;
75ef7389 594 }
7d21fec9
DA		 595out:
596 res->nh = nh;
597 res->fib6_type = res->f6i->fib6_type;
598 res->fib6_flags = res->f6i->fib6_flags;
f88d8ea6
DA		 599 return;
600
601out_blackhole:
602 res->fib6_flags |= RTF_REJECT;
603 res->fib6_type = RTN_BLACKHOLE;
604 res->nh = nh;
1da177e4
LT		 605}
606
27097255 607#ifdef CONFIG_IPV6_ROUTER_PREF
c2f17e82
HFS		 608struct __rt6_probe_work {
609 struct work_struct work;
610 struct in6_addr target;
611 struct net_device *dev;
612};
613
614static void rt6_probe_deferred(struct work_struct *w)
615{
616 struct in6_addr mcaddr;
617 struct __rt6_probe_work *work =
618 container_of(w, struct __rt6_probe_work, work);
619
620 addrconf_addr_solict_mult(&work->target, &mcaddr);
adc176c5 621 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
c2f17e82 622 dev_put(work->dev);
662f5533 623 kfree(work);
c2f17e82
HFS		 624}
625
cc3a86c8 626static void rt6_probe(struct fib6_nh *fib6_nh)
27097255 627{
f547fac6 628 struct __rt6_probe_work *work = NULL;
5e670d84 629 const struct in6_addr *nh_gw;
1bef4c22 630 unsigned long last_probe;
f2c31e32 631 struct neighbour *neigh;
5e670d84 632 struct net_device *dev;
f547fac6 633 struct inet6_dev *idev;
5e670d84 634
27097255
YH		 635 /*
636 * Okay, this does not seem to be appropriate
637 * for now, however, we need to check if it
638 * is really so; aka Router Reachability Probing.
639 *
640 * Router Reachability Probe MUST be rate-limited
641 * to no more than one per minute.
642 */
004b3942 643 if (!fib6_nh->fib_nh_gw_family)
7ff74a59 644 return;
5e670d84 645
cc3a86c8
DA		 646 nh_gw = &fib6_nh->fib_nh_gw6;
647 dev = fib6_nh->fib_nh_dev;
2152caea 648 rcu_read_lock_bh();
1bef4c22 649 last_probe = READ_ONCE(fib6_nh->last_probe);
f547fac6 650 idev = __in6_dev_get(dev);
5e670d84 651 neigh = __ipv6_neigh_lookup_noref(dev, nh_gw);
2152caea 652 if (neigh) {
8d6c31bf
MKL		 653 if (neigh->nud_state & NUD_VALID)
654 goto out;
655
2152caea 656 write_lock(&neigh->lock);
990edb42
MKL		 657 if (!(neigh->nud_state & NUD_VALID) &&
658 time_after(jiffies,
dcd1f572 659 neigh->updated + idev->cnf.rtr_probe_interval)) {
990edb42
MKL		 660 work = kmalloc(sizeof(*work), GFP_ATOMIC);
661 if (work)
662 __neigh_set_probe_once(neigh);
c2f17e82 663 }
2152caea 664 write_unlock(&neigh->lock);
1bef4c22 665 } else if (time_after(jiffies, last_probe +
f547fac6 666 idev->cnf.rtr_probe_interval)) {
990edb42 667 work = kmalloc(sizeof(*work), GFP_ATOMIC);
f2c31e32 668 }
990edb42 669
1bef4c22
ED		 670 if (!work || cmpxchg(&fib6_nh->last_probe,
671 last_probe, jiffies) != last_probe) {
672 kfree(work);
673 } else {
990edb42 674 INIT_WORK(&work->work, rt6_probe_deferred);
5e670d84
DA		 675 work->target = *nh_gw;
676 dev_hold(dev);
677 work->dev = dev;
990edb42
MKL		 678 schedule_work(&work->work);
679 }
680
8d6c31bf 681out:
2152caea 682 rcu_read_unlock_bh();
27097255
YH		 683}
684#else
cc3a86c8 685static inline void rt6_probe(struct fib6_nh *fib6_nh)
27097255 686{
27097255
YH		 687}
688#endif
689
1da177e4 690/*
554cfb7e 691 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 692 */
1ba9a895 693static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh)
1da177e4 694{
afc154e9 695 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
5e670d84 696 struct neighbour *neigh;
f2c31e32 697
145a3621 698 rcu_read_lock_bh();
1ba9a895
DA		 699 neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev,
700 &fib6_nh->fib_nh_gw6);
145a3621
YH		 701 if (neigh) {
702 read_lock(&neigh->lock);
554cfb7e 703 if (neigh->nud_state & NUD_VALID)
afc154e9 704 ret = RT6_NUD_SUCCEED;
398bcbeb 705#ifdef CONFIG_IPV6_ROUTER_PREF
a5a81f0b 706 else if (!(neigh->nud_state & NUD_FAILED))
afc154e9 707 ret = RT6_NUD_SUCCEED;
7e980569
JB		 708 else
709 ret = RT6_NUD_FAIL_PROBE;
398bcbeb 710#endif
145a3621 711 read_unlock(&neigh->lock);
afc154e9
HFS		 712 } else {
713 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
7e980569 714 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
a5a81f0b 715 }
145a3621
YH		 716 rcu_read_unlock_bh();
717
a5a81f0b 718 return ret;
1da177e4
LT		 719}
720
702cea56
DA		 721static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
722 int strict)
1da177e4 723{
6e1809a5
DA		 724 int m = 0;
725
726 if (!oif || nh->fib_nh_dev->ifindex == oif)
727 m = 2;
1ab1457c 728
77d16f45 729 if (!m && (strict & RT6_LOOKUP_F_IFACE))
afc154e9 730 return RT6_NUD_FAIL_HARD;
ebacaaa0 731#ifdef CONFIG_IPV6_ROUTER_PREF
702cea56 732 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2;
ebacaaa0 733#endif
1ba9a895 734 if ((strict & RT6_LOOKUP_F_REACHABLE) &&
702cea56 735 !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) {
1ba9a895 736 int n = rt6_check_neigh(nh);
afc154e9
HFS		 737 if (n < 0)
738 return n;
739 }
554cfb7e
YH		 740 return m;
741}
742
28679ed1
DA		 743static bool find_match(struct fib6_nh *nh, u32 fib6_flags,
744 int oif, int strict, int *mpri, bool *do_rr)
554cfb7e 745{
afc154e9 746 bool match_do_rr = false;
28679ed1
DA		 747 bool rc = false;
748 int m;
35103d11 749
28679ed1 750 if (nh->fib_nh_flags & RTNH_F_DEAD)
8067bb8c
IS		 751 goto out;
752
28679ed1
DA		 753 if (ip6_ignore_linkdown(nh->fib_nh_dev) &&
754 nh->fib_nh_flags & RTNH_F_LINKDOWN &&
d5d32e4b 755 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
35103d11 756 goto out;
f11e6659 757
28679ed1 758 m = rt6_score_route(nh, fib6_flags, oif, strict);
7e980569 759 if (m == RT6_NUD_FAIL_DO_RR) {
afc154e9
HFS		 760 match_do_rr = true;
761 m = 0; /* lowest valid score */
7e980569 762 } else if (m == RT6_NUD_FAIL_HARD) {
f11e6659 763 goto out;
afc154e9
HFS		 764 }
765
766 if (strict & RT6_LOOKUP_F_REACHABLE)
28679ed1 767 rt6_probe(nh);
f11e6659 768
7e980569 769 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
f11e6659 770 if (m > *mpri) {
afc154e9 771 *do_rr = match_do_rr;
f11e6659 772 *mpri = m;
28679ed1 773 rc = true;
f11e6659 774 }
f11e6659 775out:
28679ed1 776 return rc;
f11e6659
DM		 777}
778
17a5984e
DA		 779struct fib6_nh_frl_arg {
780 u32 flags;
781 int oif;
782 int strict;
783 int *mpri;
784 bool *do_rr;
785 struct fib6_nh *nh;
786};
787
788static int rt6_nh_find_match(struct fib6_nh *nh, void *_arg)
789{
790 struct fib6_nh_frl_arg *arg = _arg;
791
792 arg->nh = nh;
793 return find_match(nh, arg->flags, arg->oif, arg->strict,
794 arg->mpri, arg->do_rr);
795}
796
b7bc4b6a 797static void __find_rr_leaf(struct fib6_info *f6i_start,
30c15f03 798 struct fib6_info *nomatch, u32 metric,
b7bc4b6a 799 struct fib6_result *res, struct fib6_info **cont,
30c15f03 800 int oif, int strict, bool *do_rr, int *mpri)
f11e6659 801{
b7bc4b6a 802 struct fib6_info *f6i;
1da177e4 803
b7bc4b6a
DA		 804 for (f6i = f6i_start;
805 f6i && f6i != nomatch;
806 f6i = rcu_dereference(f6i->fib6_next)) {
17a5984e 807 bool matched = false;
30c15f03
DA		 808 struct fib6_nh *nh;
809
b7bc4b6a
DA		 810 if (cont && f6i->fib6_metric != metric) {
811 *cont = f6i;
30c15f03 812 return;
9fbdcfaf
SK		 813 }
814
b7bc4b6a 815 if (fib6_check_expired(f6i))
28679ed1
DA		 816 continue;
817
17a5984e
DA		 818 if (unlikely(f6i->nh)) {
819 struct fib6_nh_frl_arg arg = {
820 .flags = f6i->fib6_flags,
821 .oif = oif,
822 .strict = strict,
823 .mpri = mpri,
824 .do_rr = do_rr
825 };
826
827 if (nexthop_is_blackhole(f6i->nh)) {
828 res->fib6_flags = RTF_REJECT;
829 res->fib6_type = RTN_BLACKHOLE;
830 res->f6i = f6i;
831 res->nh = nexthop_fib6_nh(f6i->nh);
832 return;
833 }
834 if (nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_find_match,
835 &arg)) {
836 matched = true;
837 nh = arg.nh;
838 }
839 } else {
840 nh = f6i->fib6_nh;
841 if (find_match(nh, f6i->fib6_flags, oif, strict,
842 mpri, do_rr))
843 matched = true;
844 }
845 if (matched) {
b7bc4b6a
DA		 846 res->f6i = f6i;
847 res->nh = nh;
7d21fec9
DA		 848 res->fib6_flags = f6i->fib6_flags;
849 res->fib6_type = f6i->fib6_type;
b7bc4b6a 850 }
9fbdcfaf 851 }
30c15f03 852}
9fbdcfaf 853
b7bc4b6a
DA		 854static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf,
855 struct fib6_info *rr_head, int oif, int strict,
856 bool *do_rr, struct fib6_result *res)
30c15f03 857{
b7bc4b6a
DA		 858 u32 metric = rr_head->fib6_metric;
859 struct fib6_info *cont = NULL;
30c15f03 860 int mpri = -1;
9fbdcfaf 861
b7bc4b6a 862 __find_rr_leaf(rr_head, NULL, metric, res, &cont,
30c15f03 863 oif, strict, do_rr, &mpri);
28679ed1 864
b7bc4b6a 865 __find_rr_leaf(leaf, rr_head, metric, res, &cont,
30c15f03 866 oif, strict, do_rr, &mpri);
9fbdcfaf 867
b7bc4b6a
DA		 868 if (res->f6i || !cont)
869 return;
9fbdcfaf 870
b7bc4b6a 871 __find_rr_leaf(cont, NULL, metric, res, NULL,
30c15f03 872 oif, strict, do_rr, &mpri);
f11e6659 873}
1da177e4 874
b7bc4b6a
DA		 875static void rt6_select(struct net *net, struct fib6_node *fn, int oif,
876 struct fib6_result *res, int strict)
f11e6659 877{
8d1c802b 878 struct fib6_info *leaf = rcu_dereference(fn->leaf);
b7bc4b6a 879 struct fib6_info *rt0;
afc154e9 880 bool do_rr = false;
17ecf590 881 int key_plen;
1da177e4 882
b7bc4b6a
DA		 883 /* make sure this function or its helpers sets f6i */
884 res->f6i = NULL;
885
421842ed 886 if (!leaf || leaf == net->ipv6.fib6_null_entry)
b7bc4b6a 887 goto out;
8d1040e8 888
66f5d6ce 889 rt0 = rcu_dereference(fn->rr_ptr);
f11e6659 890 if (!rt0)
66f5d6ce 891 rt0 = leaf;
1da177e4 892
17ecf590
WW		 893 /* Double check to make sure fn is not an intermediate node
894 * and fn->leaf does not points to its child's leaf
895 * (This might happen if all routes under fn are deleted from
896 * the tree and fib6_repair_tree() is called on the node.)
897 */
93c2fb25 898 key_plen = rt0->fib6_dst.plen;
17ecf590 899#ifdef CONFIG_IPV6_SUBTREES
93c2fb25
DA		 900 if (rt0->fib6_src.plen)
901 key_plen = rt0->fib6_src.plen;
17ecf590
WW		 902#endif
903 if (fn->fn_bit != key_plen)
b7bc4b6a 904 goto out;
1da177e4 905
b7bc4b6a 906 find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res);
afc154e9 907 if (do_rr) {
8fb11a9a 908 struct fib6_info *next = rcu_dereference(rt0->fib6_next);
f11e6659 909
554cfb7e 910 /* no entries matched; do round-robin */
93c2fb25 911 if (!next || next->fib6_metric != rt0->fib6_metric)
8d1040e8 912 next = leaf;
f11e6659 913
66f5d6ce 914 if (next != rt0) {
93c2fb25 915 spin_lock_bh(&leaf->fib6_table->tb6_lock);
66f5d6ce 916 /* make sure next is not being deleted from the tree */
93c2fb25 917 if (next->fib6_node)
66f5d6ce 918 rcu_assign_pointer(fn->rr_ptr, next);
93c2fb25 919 spin_unlock_bh(&leaf->fib6_table->tb6_lock);
66f5d6ce 920 }
1da177e4 921 }
1da177e4 922
b7bc4b6a
DA		 923out:
924 if (!res->f6i) {
925 res->f6i = net->ipv6.fib6_null_entry;
1cf844c7 926 res->nh = res->f6i->fib6_nh;
7d21fec9
DA		 927 res->fib6_flags = res->f6i->fib6_flags;
928 res->fib6_type = res->f6i->fib6_type;
b7bc4b6a 929 }
1da177e4
LT		 930}
931
85bd05de 932static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res)
8b9df265 933{
85bd05de
DA		 934 return (res->f6i->fib6_flags & RTF_NONEXTHOP) ||
935 res->nh->fib_nh_gw_family;
8b9df265
MKL		 936}
937
70ceb4f5
YH		 938#ifdef CONFIG_IPV6_ROUTE_INFO
939int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
b71d1d42 940 const struct in6_addr *gwaddr)
70ceb4f5 941{
c346dca1 942 struct net *net = dev_net(dev);
70ceb4f5
YH		 943 struct route_info *rinfo = (struct route_info *) opt;
944 struct in6_addr prefix_buf, *prefix;
945 unsigned int pref;
4bed72e4 946 unsigned long lifetime;
8d1c802b 947 struct fib6_info *rt;
70ceb4f5
YH		 948
949 if (len < sizeof(struct route_info)) {
950 return -EINVAL;
951 }
952
953 /* Sanity check for prefix_len and length */
954 if (rinfo->length > 3) {
955 return -EINVAL;
956 } else if (rinfo->prefix_len > 128) {
957 return -EINVAL;
958 } else if (rinfo->prefix_len > 64) {
959 if (rinfo->length < 2) {
960 return -EINVAL;
961 }
962 } else if (rinfo->prefix_len > 0) {
963 if (rinfo->length < 1) {
964 return -EINVAL;
965 }
966 }
967
968 pref = rinfo->route_pref;
969 if (pref == ICMPV6_ROUTER_PREF_INVALID)
3933fc95 970 return -EINVAL;
70ceb4f5 971
4bed72e4 972 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
70ceb4f5
YH		 973
974 if (rinfo->length == 3)
975 prefix = (struct in6_addr *)rinfo->prefix;
976 else {
977 /* this function is safe */
978 ipv6_addr_prefix(&prefix_buf,
979 (struct in6_addr *)rinfo->prefix,
980 rinfo->prefix_len);
981 prefix = &prefix_buf;
982 }
983
f104a567 984 if (rinfo->prefix_len == 0)
afb1d4b5 985 rt = rt6_get_dflt_router(net, gwaddr, dev);
f104a567
DJ		 986 else
987 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
830218c1 988 gwaddr, dev);
70ceb4f5
YH		 989
990 if (rt && !lifetime) {
11dd74b3 991 ip6_del_rt(net, rt, false);
70ceb4f5
YH		 992 rt = NULL;
993 }
994
995 if (!rt && lifetime)
830218c1
DA		 996 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
997 dev, pref);
70ceb4f5 998 else if (rt)
93c2fb25
DA		 999 rt->fib6_flags = RTF_ROUTEINFO |
1000 (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
70ceb4f5
YH		 1001
1002 if (rt) {
1716a961 1003 if (!addrconf_finite_timeout(lifetime))
14895687 1004 fib6_clean_expires(rt);
1716a961 1005 else
14895687 1006 fib6_set_expires(rt, jiffies + HZ * lifetime);
1716a961 1007
93531c67 1008 fib6_info_release(rt);
70ceb4f5
YH		 1009 }
1010 return 0;
1011}
1012#endif
1013
ae90d867
DA		 1014/*
1015 * Misc support functions
1016 */
1017
1018/* called with rcu_lock held */
0d161581 1019static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res)
ae90d867 1020{
0d161581 1021 struct net_device *dev = res->nh->fib_nh_dev;
ae90d867 1022
7d21fec9 1023 if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) {
ae90d867
DA		 1024 /* for copies of local routes, dst->dev needs to be the
1025 * device if it is a master device, the master device if
1026 * device is enslaved, and the loopback as the default
1027 */
1028 if (netif_is_l3_slave(dev) &&
7d21fec9 1029 !rt6_need_strict(&res->f6i->fib6_dst.addr))
ae90d867
DA		 1030 dev = l3mdev_master_dev_rcu(dev);
1031 else if (!netif_is_l3_master(dev))
1032 dev = dev_net(dev)->loopback_dev;
1033 /* last case is netif_is_l3_master(dev) is true in which
1034 * case we want dev returned to be dev
1035 */
1036 }
1037
1038 return dev;
1039}
1040
6edb3c96
DA		 1041static const int fib6_prop[RTN_MAX + 1] = {
1042 [RTN_UNSPEC] = 0,
1043 [RTN_UNICAST] = 0,
1044 [RTN_LOCAL] = 0,
1045 [RTN_BROADCAST] = 0,
1046 [RTN_ANYCAST] = 0,
1047 [RTN_MULTICAST] = 0,
1048 [RTN_BLACKHOLE] = -EINVAL,
1049 [RTN_UNREACHABLE] = -EHOSTUNREACH,
1050 [RTN_PROHIBIT] = -EACCES,
1051 [RTN_THROW] = -EAGAIN,
1052 [RTN_NAT] = -EINVAL,
1053 [RTN_XRESOLVE] = -EINVAL,
1054};
1055
1056static int ip6_rt_type_to_error(u8 fib6_type)
1057{
1058 return fib6_prop[fib6_type];
1059}
1060
8d1c802b 1061static unsigned short fib6_info_dst_flags(struct fib6_info *rt)
3b6761d1
DA		 1062{
1063 unsigned short flags = 0;
1064
1065 if (rt->dst_nocount)
1066 flags |= DST_NOCOUNT;
1067 if (rt->dst_nopolicy)
1068 flags |= DST_NOPOLICY;
3b6761d1
DA		 1069
1070 return flags;
1071}
1072
7d21fec9 1073static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type)
6edb3c96 1074{
7d21fec9 1075 rt->dst.error = ip6_rt_type_to_error(fib6_type);
6edb3c96 1076
7d21fec9 1077 switch (fib6_type) {
6edb3c96
DA		 1078 case RTN_BLACKHOLE:
1079 rt->dst.output = dst_discard_out;
1080 rt->dst.input = dst_discard;
1081 break;
1082 case RTN_PROHIBIT:
1083 rt->dst.output = ip6_pkt_prohibit_out;
1084 rt->dst.input = ip6_pkt_prohibit;
1085 break;
1086 case RTN_THROW:
1087 case RTN_UNREACHABLE:
1088 default:
1089 rt->dst.output = ip6_pkt_discard_out;
1090 rt->dst.input = ip6_pkt_discard;
1091 break;
1092 }
1093}
1094
0d161581 1095static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res)
6edb3c96 1096{
7d21fec9 1097 struct fib6_info *f6i = res->f6i;
0d161581 1098
7d21fec9
DA		 1099 if (res->fib6_flags & RTF_REJECT) {
1100 ip6_rt_init_dst_reject(rt, res->fib6_type);
6edb3c96
DA		 1101 return;
1102 }
1103
1104 rt->dst.error = 0;
1105 rt->dst.output = ip6_output;
1106
7d21fec9 1107 if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) {
6edb3c96 1108 rt->dst.input = ip6_input;
7d21fec9 1109 } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) {
6edb3c96
DA		 1110 rt->dst.input = ip6_mc_input;
1111 } else {
1112 rt->dst.input = ip6_forward;
1113 }
1114
0d161581
DA		 1115 if (res->nh->fib_nh_lws) {
1116 rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws);
6edb3c96
DA		 1117 lwtunnel_set_redirect(&rt->dst);
1118 }
1119
1120 rt->dst.lastuse = jiffies;
1121}
1122
e873e4b9 1123/* Caller must already hold reference to @from */
8d1c802b 1124static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from)
ae90d867 1125{
ae90d867 1126 rt->rt6i_flags &= ~RTF_EXPIRES;
a68886a6 1127 rcu_assign_pointer(rt->from, from);
e1255ed4 1128 ip_dst_init_metrics(&rt->dst, from->fib6_metrics);
ae90d867
DA		 1129}
1130
0d161581
DA		 1131/* Caller must already hold reference to f6i in result */
1132static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res)
ae90d867 1133{
0d161581
DA		 1134 const struct fib6_nh *nh = res->nh;
1135 const struct net_device *dev = nh->fib_nh_dev;
1136 struct fib6_info *f6i = res->f6i;
dcd1f572 1137
0d161581 1138 ip6_rt_init_dst(rt, res);
6edb3c96 1139
0d161581 1140 rt->rt6i_dst = f6i->fib6_dst;
dcd1f572 1141 rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
7d21fec9 1142 rt->rt6i_flags = res->fib6_flags;
0d161581
DA		 1143 if (nh->fib_nh_gw_family) {
1144 rt->rt6i_gateway = nh->fib_nh_gw6;
2b2450ca
DA		 1145 rt->rt6i_flags |= RTF_GATEWAY;
1146 }
0d161581 1147 rt6_set_from(rt, f6i);
ae90d867 1148#ifdef CONFIG_IPV6_SUBTREES
0d161581 1149 rt->rt6i_src = f6i->fib6_src;
ae90d867 1150#endif
ae90d867
DA		 1151}
1152
a3c00e46
MKL		 1153static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
1154 struct in6_addr *saddr)
1155{
66f5d6ce 1156 struct fib6_node *pn, *sn;
a3c00e46
MKL		 1157 while (1) {
1158 if (fn->fn_flags & RTN_TL_ROOT)
1159 return NULL;
66f5d6ce
WW		 1160 pn = rcu_dereference(fn->parent);
1161 sn = FIB6_SUBTREE(pn);
1162 if (sn && sn != fn)
6454743b 1163 fn = fib6_node_lookup(sn, NULL, saddr);
a3c00e46
MKL		 1164 else
1165 fn = pn;
1166 if (fn->fn_flags & RTN_RTINFO)
1167 return fn;
1168 }
1169}
c71099ac 1170
10585b43 1171static bool ip6_hold_safe(struct net *net, struct rt6_info **prt)
d3843fe5
WW		 1172{
1173 struct rt6_info *rt = *prt;
1174
1175 if (dst_hold_safe(&rt->dst))
1176 return true;
10585b43 1177 if (net) {
d3843fe5
WW		 1178 rt = net->ipv6.ip6_null_entry;
1179 dst_hold(&rt->dst);
1180 } else {
1181 rt = NULL;
1182 }
1183 *prt = rt;
1184 return false;
1185}
1186
dec9b0e2 1187/* called with rcu_lock held */
9b6b35ab 1188static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res)
dec9b0e2 1189{
9b6b35ab
DA		 1190 struct net_device *dev = res->nh->fib_nh_dev;
1191 struct fib6_info *f6i = res->f6i;
1192 unsigned short flags;
dec9b0e2
DA		 1193 struct rt6_info *nrt;
1194
9b6b35ab 1195 if (!fib6_info_hold_safe(f6i))
1c87e79a 1196 goto fallback;
e873e4b9 1197
9b6b35ab 1198 flags = fib6_info_dst_flags(f6i);
93531c67 1199 nrt = ip6_dst_alloc(dev_net(dev), dev, flags);
1c87e79a 1200 if (!nrt) {
9b6b35ab 1201 fib6_info_release(f6i);
1c87e79a
XL		 1202 goto fallback;
1203 }
dec9b0e2 1204
0d161581 1205 ip6_rt_copy_init(nrt, res);
1c87e79a
XL		 1206 return nrt;
1207
1208fallback:
1209 nrt = dev_net(dev)->ipv6.ip6_null_entry;
1210 dst_hold(&nrt->dst);
dec9b0e2
DA		 1211 return nrt;
1212}
1213
55cced4f 1214INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_lookup(struct net *net,
8ed67789 1215 struct fib6_table *table,
b75cc8f9
DA		 1216 struct flowi6 *fl6,
1217 const struct sk_buff *skb,
1218 int flags)
1da177e4 1219{
b1d40991 1220 struct fib6_result res = {};
1da177e4 1221 struct fib6_node *fn;
23fb93a4 1222 struct rt6_info *rt;
1da177e4 1223
b6cdbc85
DA		 1224 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1225 flags &= ~RT6_LOOKUP_F_IFACE;
1226
66f5d6ce 1227 rcu_read_lock();
6454743b 1228 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
c71099ac 1229restart:
b1d40991
DA		 1230 res.f6i = rcu_dereference(fn->leaf);
1231 if (!res.f6i)
1232 res.f6i = net->ipv6.fib6_null_entry;
af52a52c 1233 else
75ef7389
DA		 1234 rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif,
1235 flags);
af52a52c 1236
b1d40991 1237 if (res.f6i == net->ipv6.fib6_null_entry) {
a3c00e46
MKL		 1238 fn = fib6_backtrack(fn, &fl6->saddr);
1239 if (fn)
1240 goto restart;
2b760fcf 1241
af52a52c
DA		 1242 rt = net->ipv6.ip6_null_entry;
1243 dst_hold(&rt->dst);
1244 goto out;
f88d8ea6
DA		 1245 } else if (res.fib6_flags & RTF_REJECT) {
1246 goto do_create;
af52a52c 1247 }
d3843fe5 1248
b1d40991
DA		 1249 fib6_select_path(net, &res, fl6, fl6->flowi6_oif,
1250 fl6->flowi6_oif != 0, skb, flags);
1251
2b760fcf 1252 /* Search through exception table */
7e4b5128 1253 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
23fb93a4 1254 if (rt) {
10585b43 1255 if (ip6_hold_safe(net, &rt))
dec9b0e2 1256 dst_use_noref(&rt->dst, jiffies);
23fb93a4 1257 } else {
f88d8ea6 1258do_create:
9b6b35ab 1259 rt = ip6_create_rt_rcu(&res);
dec9b0e2 1260 }
b811580d 1261
af52a52c 1262out:
8ff2e5b2 1263 trace_fib6_table_lookup(net, &res, table, fl6);
af52a52c 1264
66f5d6ce 1265 rcu_read_unlock();
b811580d 1266
c71099ac 1267 return rt;
c71099ac
TG		 1268}
1269
67ba4152 1270struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
b75cc8f9 1271 const struct sk_buff *skb, int flags)
ea6e574e 1272{
b75cc8f9 1273 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup);
ea6e574e
FW		 1274}
1275EXPORT_SYMBOL_GPL(ip6_route_lookup);
1276
9acd9f3a 1277struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
b75cc8f9
DA		 1278 const struct in6_addr *saddr, int oif,
1279 const struct sk_buff *skb, int strict)
c71099ac 1280{
4c9483b2
DM		 1281 struct flowi6 fl6 = {
1282 .flowi6_oif = oif,
1283 .daddr = *daddr,
c71099ac
TG		 1284 };
1285 struct dst_entry *dst;
77d16f45 1286 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 1287
adaa70bb 1288 if (saddr) {
4c9483b2 1289 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
adaa70bb
TG		 1290 flags |= RT6_LOOKUP_F_HAS_SADDR;
1291 }
1292
b75cc8f9 1293 dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup);
c71099ac
TG		 1294 if (dst->error == 0)
1295 return (struct rt6_info *) dst;
1296
1297 dst_release(dst);
1298
1da177e4
LT		 1299 return NULL;
1300}
7159039a
YH		 1301EXPORT_SYMBOL(rt6_lookup);
1302
c71099ac 1303/* ip6_ins_rt is called with FREE table->tb6_lock.
1cfb71ee
WW		 1304 * It takes new route entry, the addition fails by any reason the
1305 * route is released.
1306 * Caller must hold dst before calling it.
1da177e4
LT		 1307 */
1308
8d1c802b 1309static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info,
333c4301 1310 struct netlink_ext_ack *extack)
1da177e4
LT		 1311{
1312 int err;
c71099ac 1313 struct fib6_table *table;
1da177e4 1314
93c2fb25 1315 table = rt->fib6_table;
66f5d6ce 1316 spin_lock_bh(&table->tb6_lock);
d4ead6b3 1317 err = fib6_add(&table->tb6_root, rt, info, extack);
66f5d6ce 1318 spin_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1319
1320 return err;
1321}
1322
8d1c802b 1323int ip6_ins_rt(struct net *net, struct fib6_info *rt)
40e22e8f 1324{
afb1d4b5 1325 struct nl_info info = { .nl_net = net, };
e715b6d3 1326
d4ead6b3 1327 return __ip6_ins_rt(rt, &info, NULL);
40e22e8f
TG		 1328}
1329
85bd05de 1330static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res,
8b9df265
MKL		 1331 const struct in6_addr *daddr,
1332 const struct in6_addr *saddr)
1da177e4 1333{
85bd05de 1334 struct fib6_info *f6i = res->f6i;
4832c30d 1335 struct net_device *dev;
1da177e4
LT		 1336 struct rt6_info *rt;
1337
1338 /*
1339 * Clone the route.
1340 */
1341
85bd05de 1342 if (!fib6_info_hold_safe(f6i))
e873e4b9
WW		 1343 return NULL;
1344
0d161581 1345 dev = ip6_rt_get_dev_rcu(res);
93531c67 1346 rt = ip6_dst_alloc(dev_net(dev), dev, 0);
e873e4b9 1347 if (!rt) {
85bd05de 1348 fib6_info_release(f6i);
83a09abd 1349 return NULL;
e873e4b9 1350 }
83a09abd 1351
0d161581 1352 ip6_rt_copy_init(rt, res);
83a09abd 1353 rt->rt6i_flags |= RTF_CACHE;
83a09abd
MKL		 1354 rt->rt6i_dst.addr = *daddr;
1355 rt->rt6i_dst.plen = 128;
1da177e4 1356
85bd05de
DA		 1357 if (!rt6_is_gw_or_nonexthop(res)) {
1358 if (f6i->fib6_dst.plen != 128 &&
1359 ipv6_addr_equal(&f6i->fib6_dst.addr, daddr))
83a09abd 1360 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 1361#ifdef CONFIG_IPV6_SUBTREES
83a09abd
MKL		 1362 if (rt->rt6i_src.plen && saddr) {
1363 rt->rt6i_src.addr = *saddr;
1364 rt->rt6i_src.plen = 128;
8b9df265 1365 }
83a09abd 1366#endif
95a9a5ba 1367 }
1da177e4 1368
95a9a5ba
YH		 1369 return rt;
1370}
1da177e4 1371
db3fedee 1372static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res)
d52d3997 1373{
db3fedee
DA		 1374 struct fib6_info *f6i = res->f6i;
1375 unsigned short flags = fib6_info_dst_flags(f6i);
4832c30d 1376 struct net_device *dev;
d52d3997
MKL		 1377 struct rt6_info *pcpu_rt;
1378
db3fedee 1379 if (!fib6_info_hold_safe(f6i))
e873e4b9
WW		 1380 return NULL;
1381
4832c30d 1382 rcu_read_lock();
0d161581 1383 dev = ip6_rt_get_dev_rcu(res);
d8882935 1384 pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags | DST_NOCOUNT);
4832c30d 1385 rcu_read_unlock();
e873e4b9 1386 if (!pcpu_rt) {
db3fedee 1387 fib6_info_release(f6i);
d52d3997 1388 return NULL;
e873e4b9 1389 }
0d161581 1390 ip6_rt_copy_init(pcpu_rt, res);
d52d3997 1391 pcpu_rt->rt6i_flags |= RTF_PCPU;
8f34e53b
DA		 1392
1393 if (f6i->nh)
1394 pcpu_rt->sernum = rt_genid_ipv6(dev_net(dev));
1395
d52d3997
MKL		 1396 return pcpu_rt;
1397}
1398
8f34e53b
DA		 1399static bool rt6_is_valid(const struct rt6_info *rt6)
1400{
1401 return rt6->sernum == rt_genid_ipv6(dev_net(rt6->dst.dev));
1402}
1403
66f5d6ce 1404/* It should be called with rcu_read_lock() acquired */
db3fedee 1405static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res)
d52d3997 1406{
c353071a 1407 struct rt6_info *pcpu_rt;
d52d3997 1408
c353071a 1409 pcpu_rt = this_cpu_read(*res->nh->rt6i_pcpu);
d52d3997 1410
8f34e53b
DA		 1411 if (pcpu_rt && pcpu_rt->sernum && !rt6_is_valid(pcpu_rt)) {
1412 struct rt6_info *prev, **p;
1413
1414 p = this_cpu_ptr(res->nh->rt6i_pcpu);
1415 prev = xchg(p, NULL);
1416 if (prev) {
1417 dst_dev_put(&prev->dst);
1418 dst_release(&prev->dst);
1419 }
1420
1421 pcpu_rt = NULL;
1422 }
1423
a73e4195
MKL		 1424 return pcpu_rt;
1425}
1426
afb1d4b5 1427static struct rt6_info *rt6_make_pcpu_route(struct net *net,
db3fedee 1428 const struct fib6_result *res)
a73e4195
MKL		 1429{
1430 struct rt6_info *pcpu_rt, *prev, **p;
d52d3997 1431
db3fedee 1432 pcpu_rt = ip6_rt_pcpu_alloc(res);
0e09edcc
WW		 1433 if (!pcpu_rt)
1434 return NULL;
d52d3997 1435
f40b6ae2 1436 p = this_cpu_ptr(res->nh->rt6i_pcpu);
a94b9367 1437 prev = cmpxchg(p, NULL, pcpu_rt);
951f788a 1438 BUG_ON(prev);
a94b9367 1439
61fb0d01
ED		 1440 if (res->f6i->fib6_destroying) {
1441 struct fib6_info *from;
1442
1443 from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL);
1444 fib6_info_release(from);
1445 }
1446
d52d3997
MKL		 1447 return pcpu_rt;
1448}
1449
35732d01
WW		 1450/* exception hash table implementation
1451 */
1452static DEFINE_SPINLOCK(rt6_exception_lock);
1453
1454/* Remove rt6_ex from hash table and free the memory
1455 * Caller must hold rt6_exception_lock
1456 */
1457static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
1458 struct rt6_exception *rt6_ex)
1459{
f5b51fe8 1460 struct fib6_info *from;
b2427e67 1461 struct net *net;
81eb8447 1462
35732d01
WW		 1463 if (!bucket || !rt6_ex)
1464 return;
b2427e67
CIK		 1465
1466 net = dev_net(rt6_ex->rt6i->dst.dev);
f5b51fe8
PA		 1467 net->ipv6.rt6_stats->fib_rt_cache--;
1468
1469 /* purge completely the exception to allow releasing the held resources:
1470 * some [sk] cache may keep the dst around for unlimited time
1471 */
0e233874 1472 from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL);
f5b51fe8
PA		 1473 fib6_info_release(from);
1474 dst_dev_put(&rt6_ex->rt6i->dst);
1475
35732d01 1476 hlist_del_rcu(&rt6_ex->hlist);
77634cc6 1477 dst_release(&rt6_ex->rt6i->dst);
35732d01
WW		 1478 kfree_rcu(rt6_ex, rcu);
1479 WARN_ON_ONCE(!bucket->depth);
1480 bucket->depth--;
1481}
1482
1483/* Remove oldest rt6_ex in bucket and free the memory
1484 * Caller must hold rt6_exception_lock
1485 */
1486static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket)
1487{
1488 struct rt6_exception *rt6_ex, *oldest = NULL;
1489
1490 if (!bucket)
1491 return;
1492
1493 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
1494 if (!oldest || time_before(rt6_ex->stamp, oldest->stamp))
1495 oldest = rt6_ex;
1496 }
1497 rt6_remove_exception(bucket, oldest);
1498}
1499
1500static u32 rt6_exception_hash(const struct in6_addr *dst,
1501 const struct in6_addr *src)
1502{
1503 static u32 seed __read_mostly;
1504 u32 val;
1505
1506 net_get_random_once(&seed, sizeof(seed));
b6b556af 1507 val = jhash2((const u32 *)dst, sizeof(*dst)/sizeof(u32), seed);
35732d01
WW		 1508
1509#ifdef CONFIG_IPV6_SUBTREES
1510 if (src)
b6b556af 1511 val = jhash2((const u32 *)src, sizeof(*src)/sizeof(u32), val);
35732d01
WW		 1512#endif
1513 return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
1514}
1515
1516/* Helper function to find the cached rt in the hash table
1517 * and update bucket pointer to point to the bucket for this
1518 * (daddr, saddr) pair
1519 * Caller must hold rt6_exception_lock
1520 */
1521static struct rt6_exception *
1522__rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket,
1523 const struct in6_addr *daddr,
1524 const struct in6_addr *saddr)
1525{
1526 struct rt6_exception *rt6_ex;
1527 u32 hval;
1528
1529 if (!(*bucket) || !daddr)
1530 return NULL;
1531
1532 hval = rt6_exception_hash(daddr, saddr);
1533 *bucket += hval;
1534
1535 hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) {
1536 struct rt6_info *rt6 = rt6_ex->rt6i;
1537 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1538
1539#ifdef CONFIG_IPV6_SUBTREES
1540 if (matched && saddr)
1541 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1542#endif
1543 if (matched)
1544 return rt6_ex;
1545 }
1546 return NULL;
1547}
1548
1549/* Helper function to find the cached rt in the hash table
1550 * and update bucket pointer to point to the bucket for this
1551 * (daddr, saddr) pair
1552 * Caller must hold rcu_read_lock()
1553 */
1554static struct rt6_exception *
1555__rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
1556 const struct in6_addr *daddr,
1557 const struct in6_addr *saddr)
1558{
1559 struct rt6_exception *rt6_ex;
1560 u32 hval;
1561
1562 WARN_ON_ONCE(!rcu_read_lock_held());
1563
1564 if (!(*bucket) || !daddr)
1565 return NULL;
1566
1567 hval = rt6_exception_hash(daddr, saddr);
1568 *bucket += hval;
1569
1570 hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) {
1571 struct rt6_info *rt6 = rt6_ex->rt6i;
1572 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1573
1574#ifdef CONFIG_IPV6_SUBTREES
1575 if (matched && saddr)
1576 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1577#endif
1578 if (matched)
1579 return rt6_ex;
1580 }
1581 return NULL;
1582}
1583
b748f260 1584static unsigned int fib6_mtu(const struct fib6_result *res)
d4ead6b3 1585{
b748f260 1586 const struct fib6_nh *nh = res->nh;
d4ead6b3
DA		 1587 unsigned int mtu;
1588
b748f260
DA		 1589 if (res->f6i->fib6_pmtu) {
1590 mtu = res->f6i->fib6_pmtu;
dcd1f572 1591 } else {
b748f260 1592 struct net_device *dev = nh->fib_nh_dev;
dcd1f572
DA		 1593 struct inet6_dev *idev;
1594
1595 rcu_read_lock();
1596 idev = __in6_dev_get(dev);
1597 mtu = idev->cnf.mtu6;
1598 rcu_read_unlock();
1599 }
1600
d4ead6b3
DA		 1601 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1602
b748f260 1603 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
d4ead6b3
DA		 1604}
1605
cc5c073a
DA		 1606#define FIB6_EXCEPTION_BUCKET_FLUSHED 0x1UL
1607
1608/* used when the flushed bit is not relevant, only access to the bucket
1609 * (ie., all bucket users except rt6_insert_exception);
1610 *
1611 * called under rcu lock; sometimes called with rt6_exception_lock held
1612 */
1613static
1614struct rt6_exception_bucket *fib6_nh_get_excptn_bucket(const struct fib6_nh *nh,
1615 spinlock_t *lock)
1616{
1617 struct rt6_exception_bucket *bucket;
1618
1619 if (lock)
1620 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1621 lockdep_is_held(lock));
1622 else
1623 bucket = rcu_dereference(nh->rt6i_exception_bucket);
1624
1625 /* remove bucket flushed bit if set */
1626 if (bucket) {
1627 unsigned long p = (unsigned long)bucket;
1628
1629 p &= ~FIB6_EXCEPTION_BUCKET_FLUSHED;
1630 bucket = (struct rt6_exception_bucket *)p;
1631 }
1632
1633 return bucket;
1634}
1635
1636static bool fib6_nh_excptn_bucket_flushed(struct rt6_exception_bucket *bucket)
1637{
1638 unsigned long p = (unsigned long)bucket;
1639
1640 return !!(p & FIB6_EXCEPTION_BUCKET_FLUSHED);
1641}
1642
1643/* called with rt6_exception_lock held */
1644static void fib6_nh_excptn_bucket_set_flushed(struct fib6_nh *nh,
1645 spinlock_t *lock)
1646{
1647 struct rt6_exception_bucket *bucket;
1648 unsigned long p;
1649
1650 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1651 lockdep_is_held(lock));
1652
1653 p = (unsigned long)bucket;
1654 p |= FIB6_EXCEPTION_BUCKET_FLUSHED;
1655 bucket = (struct rt6_exception_bucket *)p;
1656 rcu_assign_pointer(nh->rt6i_exception_bucket, bucket);
1657}
1658
35732d01 1659static int rt6_insert_exception(struct rt6_info *nrt,
5012f0a5 1660 const struct fib6_result *res)
35732d01 1661{
5e670d84 1662 struct net *net = dev_net(nrt->dst.dev);
35732d01 1663 struct rt6_exception_bucket *bucket;
cc5c073a 1664 struct fib6_info *f6i = res->f6i;
35732d01
WW		 1665 struct in6_addr *src_key = NULL;
1666 struct rt6_exception *rt6_ex;
cc5c073a 1667 struct fib6_nh *nh = res->nh;
35732d01
WW		 1668 int err = 0;
1669
35732d01
WW		 1670 spin_lock_bh(&rt6_exception_lock);
1671
cc5c073a
DA		 1672 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1673 lockdep_is_held(&rt6_exception_lock));
35732d01
WW		 1674 if (!bucket) {
1675 bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket),
1676 GFP_ATOMIC);
1677 if (!bucket) {
1678 err = -ENOMEM;
1679 goto out;
1680 }
cc5c073a
DA		 1681 rcu_assign_pointer(nh->rt6i_exception_bucket, bucket);
1682 } else if (fib6_nh_excptn_bucket_flushed(bucket)) {
1683 err = -EINVAL;
1684 goto out;
35732d01
WW		 1685 }
1686
1687#ifdef CONFIG_IPV6_SUBTREES
5012f0a5 1688 /* fib6_src.plen != 0 indicates f6i is in subtree
35732d01 1689 * and exception table is indexed by a hash of
5012f0a5 1690 * both fib6_dst and fib6_src.
35732d01 1691 * Otherwise, the exception table is indexed by
5012f0a5 1692 * a hash of only fib6_dst.
35732d01 1693 */
5012f0a5 1694 if (f6i->fib6_src.plen)
35732d01
WW		 1695 src_key = &nrt->rt6i_src.addr;
1696#endif
5012f0a5 1697 /* rt6_mtu_change() might lower mtu on f6i.
f5bbe7ee 1698 * Only insert this exception route if its mtu
5012f0a5 1699 * is less than f6i's mtu value.
f5bbe7ee 1700 */
b748f260 1701 if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) {
f5bbe7ee
WW		 1702 err = -EINVAL;
1703 goto out;
1704 }
60006a48 1705
35732d01
WW		 1706 rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr,
1707 src_key);
1708 if (rt6_ex)
1709 rt6_remove_exception(bucket, rt6_ex);
1710
1711 rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC);
1712 if (!rt6_ex) {
1713 err = -ENOMEM;
1714 goto out;
1715 }
1716 rt6_ex->rt6i = nrt;
1717 rt6_ex->stamp = jiffies;
35732d01
WW		 1718 hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain);
1719 bucket->depth++;
81eb8447 1720 net->ipv6.rt6_stats->fib_rt_cache++;
35732d01
WW		 1721
1722 if (bucket->depth > FIB6_MAX_DEPTH)
1723 rt6_exception_remove_oldest(bucket);
1724
1725out:
1726 spin_unlock_bh(&rt6_exception_lock);
1727
1728 /* Update fn->fn_sernum to invalidate all cached dst */
b886d5f2 1729 if (!err) {
5012f0a5
DA		 1730 spin_lock_bh(&f6i->fib6_table->tb6_lock);
1731 fib6_update_sernum(net, f6i);
1732 spin_unlock_bh(&f6i->fib6_table->tb6_lock);
b886d5f2
PA		 1733 fib6_force_start_gc(net);
1734 }
35732d01
WW		 1735
1736 return err;
1737}
1738
c0b220cf 1739static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from)
35732d01
WW		 1740{
1741 struct rt6_exception_bucket *bucket;
1742 struct rt6_exception *rt6_ex;
1743 struct hlist_node *tmp;
1744 int i;
1745
1746 spin_lock_bh(&rt6_exception_lock);
35732d01 1747
cc5c073a 1748 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
35732d01
WW		 1749 if (!bucket)
1750 goto out;
1751
cc5c073a
DA		 1752 /* Prevent rt6_insert_exception() to recreate the bucket list */
1753 if (!from)
1754 fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock);
1755
35732d01 1756 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
cc5c073a
DA		 1757 hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) {
1758 if (!from ||
1759 rcu_access_pointer(rt6_ex->rt6i->from) == from)
1760 rt6_remove_exception(bucket, rt6_ex);
1761 }
1762 WARN_ON_ONCE(!from && bucket->depth);
35732d01
WW		 1763 bucket++;
1764 }
35732d01
WW		 1765out:
1766 spin_unlock_bh(&rt6_exception_lock);
1767}
1768
e659ba31
DA		 1769static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg)
1770{
1771 struct fib6_info *f6i = arg;
1772
1773 fib6_nh_flush_exceptions(nh, f6i);
1774
1775 return 0;
1776}
1777
c0b220cf
DA		 1778void rt6_flush_exceptions(struct fib6_info *f6i)
1779{
e659ba31
DA		 1780 if (f6i->nh)
1781 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions,
1782 f6i);
1783 else
1784 fib6_nh_flush_exceptions(f6i->fib6_nh, f6i);
c0b220cf
DA		 1785}
1786
35732d01
WW		 1787/* Find cached rt in the hash table inside passed in rt
1788 * Caller has to hold rcu_read_lock()
1789 */
7e4b5128 1790static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
510e2ced
WW		 1791 const struct in6_addr *daddr,
1792 const struct in6_addr *saddr)
35732d01 1793{
510e2ced 1794 const struct in6_addr *src_key = NULL;
35732d01 1795 struct rt6_exception_bucket *bucket;
35732d01 1796 struct rt6_exception *rt6_ex;
7e4b5128 1797 struct rt6_info *ret = NULL;
35732d01 1798
35732d01 1799#ifdef CONFIG_IPV6_SUBTREES
7e4b5128 1800 /* fib6i_src.plen != 0 indicates f6i is in subtree
35732d01 1801 * and exception table is indexed by a hash of
7e4b5128 1802 * both fib6_dst and fib6_src.
510e2ced
WW		 1803 * However, the src addr used to create the hash
1804 * might not be exactly the passed in saddr which
1805 * is a /128 addr from the flow.
1806 * So we need to use f6i->fib6_src to redo lookup
1807 * if the passed in saddr does not find anything.
1808 * (See the logic in ip6_rt_cache_alloc() on how
1809 * rt->rt6i_src is updated.)
35732d01 1810 */
7e4b5128 1811 if (res->f6i->fib6_src.plen)
35732d01 1812 src_key = saddr;
510e2ced 1813find_ex:
35732d01 1814#endif
cc5c073a 1815 bucket = fib6_nh_get_excptn_bucket(res->nh, NULL);
35732d01
WW		 1816 rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
1817
1818 if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
7e4b5128 1819 ret = rt6_ex->rt6i;
35732d01 1820
510e2ced
WW		 1821#ifdef CONFIG_IPV6_SUBTREES
1822 /* Use fib6_src as src_key and redo lookup */
1823 if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) {
1824 src_key = &res->f6i->fib6_src.addr;
1825 goto find_ex;
1826 }
1827#endif
1828
7e4b5128 1829 return ret;
35732d01
WW		 1830}
1831
1832/* Remove the passed in cached rt from the hash table that contains it */
cc5c073a 1833static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen,
c0b220cf 1834 const struct rt6_info *rt)
35732d01 1835{
c0b220cf 1836 const struct in6_addr *src_key = NULL;
35732d01 1837 struct rt6_exception_bucket *bucket;
35732d01
WW		 1838 struct rt6_exception *rt6_ex;
1839 int err;
1840
cc5c073a 1841 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
35732d01
WW		 1842 return -ENOENT;
1843
1844 spin_lock_bh(&rt6_exception_lock);
cc5c073a
DA		 1845 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
1846
35732d01 1847#ifdef CONFIG_IPV6_SUBTREES
cc5c073a
DA		 1848 /* rt6i_src.plen != 0 indicates 'from' is in subtree
1849 * and exception table is indexed by a hash of
1850 * both rt6i_dst and rt6i_src.
35732d01
WW		 1851 * Otherwise, the exception table is indexed by
1852 * a hash of only rt6i_dst.
1853 */
c0b220cf 1854 if (plen)
35732d01
WW		 1855 src_key = &rt->rt6i_src.addr;
1856#endif
1857 rt6_ex = __rt6_find_exception_spinlock(&bucket,
1858 &rt->rt6i_dst.addr,
1859 src_key);
1860 if (rt6_ex) {
1861 rt6_remove_exception(bucket, rt6_ex);
1862 err = 0;
1863 } else {
1864 err = -ENOENT;
1865 }
1866
1867 spin_unlock_bh(&rt6_exception_lock);
1868 return err;
1869}
1870
e659ba31
DA		 1871struct fib6_nh_excptn_arg {
1872 struct rt6_info *rt;
1873 int plen;
1874};
1875
1876static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg)
1877{
1878 struct fib6_nh_excptn_arg *arg = _arg;
1879 int err;
1880
1881 err = fib6_nh_remove_exception(nh, arg->plen, arg->rt);
1882 if (err == 0)
1883 return 1;
1884
1885 return 0;
1886}
1887
c0b220cf
DA		 1888static int rt6_remove_exception_rt(struct rt6_info *rt)
1889{
1890 struct fib6_info *from;
1891
1892 from = rcu_dereference(rt->from);
cc5c073a 1893 if (!from || !(rt->rt6i_flags & RTF_CACHE))
c0b220cf
DA		 1894 return -EINVAL;
1895
e659ba31
DA		 1896 if (from->nh) {
1897 struct fib6_nh_excptn_arg arg = {
1898 .rt = rt,
1899 .plen = from->fib6_src.plen
1900 };
1901 int rc;
1902
1903 /* rc = 1 means an entry was found */
1904 rc = nexthop_for_each_fib6_nh(from->nh,
1905 rt6_nh_remove_exception_rt,
1906 &arg);
1907 return rc ? 0 : -ENOENT;
1908 }
1909
1cf844c7 1910 return fib6_nh_remove_exception(from->fib6_nh,
cc5c073a 1911 from->fib6_src.plen, rt);
c0b220cf
DA		 1912}
1913
35732d01
WW		 1914/* Find rt6_ex which contains the passed in rt cache and
1915 * refresh its stamp
1916 */
cc5c073a 1917static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen,
c0b220cf 1918 const struct rt6_info *rt)
35732d01 1919{
c0b220cf 1920 const struct in6_addr *src_key = NULL;
35732d01 1921 struct rt6_exception_bucket *bucket;
35732d01 1922 struct rt6_exception *rt6_ex;
193f3685 1923
cc5c073a 1924 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
35732d01 1925#ifdef CONFIG_IPV6_SUBTREES
cc5c073a
DA		 1926 /* rt6i_src.plen != 0 indicates 'from' is in subtree
1927 * and exception table is indexed by a hash of
1928 * both rt6i_dst and rt6i_src.
35732d01
WW		 1929 * Otherwise, the exception table is indexed by
1930 * a hash of only rt6i_dst.
1931 */
c0b220cf 1932 if (plen)
35732d01
WW		 1933 src_key = &rt->rt6i_src.addr;
1934#endif
cc5c073a 1935 rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key);
35732d01
WW		 1936 if (rt6_ex)
1937 rt6_ex->stamp = jiffies;
c0b220cf
DA		 1938}
1939
e659ba31
DA		 1940struct fib6_nh_match_arg {
1941 const struct net_device *dev;
1942 const struct in6_addr *gw;
1943 struct fib6_nh *match;
1944};
1945
1946/* determine if fib6_nh has given device and gateway */
1947static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg)
1948{
1949 struct fib6_nh_match_arg *arg = _arg;
1950
1951 if (arg->dev != nh->fib_nh_dev ||
1952 (arg->gw && !nh->fib_nh_gw_family) ||
1953 (!arg->gw && nh->fib_nh_gw_family) ||
1954 (arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6)))
1955 return 0;
1956
1957 arg->match = nh;
1958
1959 /* found a match, break the loop */
1960 return 1;
1961}
1962
c0b220cf
DA		 1963static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
1964{
1965 struct fib6_info *from;
e659ba31 1966 struct fib6_nh *fib6_nh;
35732d01 1967
c0b220cf
DA		 1968 rcu_read_lock();
1969
1970 from = rcu_dereference(rt->from);
1971 if (!from || !(rt->rt6i_flags & RTF_CACHE))
1972 goto unlock;
1973
e659ba31
DA		 1974 if (from->nh) {
1975 struct fib6_nh_match_arg arg = {
1976 .dev = rt->dst.dev,
1977 .gw = &rt->rt6i_gateway,
1978 };
1979
1980 nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg);
1981
1982 if (!arg.match)
cff6a327 1983 goto unlock;
e659ba31
DA		 1984 fib6_nh = arg.match;
1985 } else {
1986 fib6_nh = from->fib6_nh;
1987 }
1988 fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt);
193f3685 1989unlock:
35732d01
WW		 1990 rcu_read_unlock();
1991}
1992
e9fa1495
SB		 1993static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
1994 struct rt6_info *rt, int mtu)
1995{
1996 /* If the new MTU is lower than the route PMTU, this new MTU will be the
1997 * lowest MTU in the path: always allow updating the route PMTU to
1998 * reflect PMTU decreases.
1999 *
2000 * If the new MTU is higher, and the route PMTU is equal to the local
2001 * MTU, this means the old MTU is the lowest in the path, so allow
2002 * updating it: if other nodes now have lower MTUs, PMTU discovery will
2003 * handle this.
2004 */
2005
2006 if (dst_mtu(&rt->dst) >= mtu)
2007 return true;
2008
2009 if (dst_mtu(&rt->dst) == idev->cnf.mtu6)
2010 return true;
2011
2012 return false;
2013}
2014
2015static void rt6_exceptions_update_pmtu(struct inet6_dev *idev,
cc5c073a 2016 const struct fib6_nh *nh, int mtu)
f5bbe7ee
WW		 2017{
2018 struct rt6_exception_bucket *bucket;
2019 struct rt6_exception *rt6_ex;
2020 int i;
2021
cc5c073a 2022 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
e9fa1495
SB		 2023 if (!bucket)
2024 return;
2025
2026 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2027 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
2028 struct rt6_info *entry = rt6_ex->rt6i;
2029
2030 /* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected
d4ead6b3 2031 * route), the metrics of its rt->from have already
e9fa1495
SB		 2032 * been updated.
2033 */
d4ead6b3 2034 if (dst_metric_raw(&entry->dst, RTAX_MTU) &&
e9fa1495 2035 rt6_mtu_change_route_allowed(idev, entry, mtu))
d4ead6b3 2036 dst_metric_set(&entry->dst, RTAX_MTU, mtu);
f5bbe7ee 2037 }
e9fa1495 2038 bucket++;
f5bbe7ee
WW		 2039 }
2040}
2041
b16cb459
WW		 2042#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2043
cc5c073a
DA		 2044static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh,
2045 const struct in6_addr *gateway)
b16cb459
WW		 2046{
2047 struct rt6_exception_bucket *bucket;
2048 struct rt6_exception *rt6_ex;
2049 struct hlist_node *tmp;
2050 int i;
2051
cc5c073a 2052 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
b16cb459
WW		 2053 return;
2054
2055 spin_lock_bh(&rt6_exception_lock);
cc5c073a 2056 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
b16cb459
WW		 2057 if (bucket) {
2058 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2059 hlist_for_each_entry_safe(rt6_ex, tmp,
2060 &bucket->chain, hlist) {
2061 struct rt6_info *entry = rt6_ex->rt6i;
2062
2063 if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) ==
2064 RTF_CACHE_GATEWAY &&
2065 ipv6_addr_equal(gateway,
2066 &entry->rt6i_gateway)) {
2067 rt6_remove_exception(bucket, rt6_ex);
2068 }
2069 }
2070 bucket++;
2071 }
2072 }
2073
2074 spin_unlock_bh(&rt6_exception_lock);
2075}
2076
c757faa8
WW		 2077static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket,
2078 struct rt6_exception *rt6_ex,
2079 struct fib6_gc_args *gc_args,
2080 unsigned long now)
2081{
2082 struct rt6_info *rt = rt6_ex->rt6i;
2083
1859bac0
PA		 2084 /* we are pruning and obsoleting aged-out and non gateway exceptions
2085 * even if others have still references to them, so that on next
2086 * dst_check() such references can be dropped.
2087 * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when
2088 * expired, independently from their aging, as per RFC 8201 section 4
2089 */
31afeb42
WW		 2090 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
2091 if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) {
2092 RT6_TRACE("aging clone %p\n", rt);
2093 rt6_remove_exception(bucket, rt6_ex);
2094 return;
2095 }
2096 } else if (time_after(jiffies, rt->dst.expires)) {
2097 RT6_TRACE("purging expired route %p\n", rt);
c757faa8
WW		 2098 rt6_remove_exception(bucket, rt6_ex);
2099 return;
31afeb42
WW		 2100 }
2101
2102 if (rt->rt6i_flags & RTF_GATEWAY) {
c757faa8
WW		 2103 struct neighbour *neigh;
2104 __u8 neigh_flags = 0;
2105
1bfa26ff
ED		 2106 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
2107 if (neigh)
c757faa8 2108 neigh_flags = neigh->flags;
1bfa26ff 2109
c757faa8
WW		 2110 if (!(neigh_flags & NTF_ROUTER)) {
2111 RT6_TRACE("purging route %p via non-router but gateway\n",
2112 rt);
2113 rt6_remove_exception(bucket, rt6_ex);
2114 return;
2115 }
2116 }
31afeb42 2117
c757faa8
WW		 2118 gc_args->more++;
2119}
2120
cc5c073a 2121static void fib6_nh_age_exceptions(const struct fib6_nh *nh,
c0b220cf
DA		 2122 struct fib6_gc_args *gc_args,
2123 unsigned long now)
c757faa8
WW		 2124{
2125 struct rt6_exception_bucket *bucket;
2126 struct rt6_exception *rt6_ex;
2127 struct hlist_node *tmp;
2128 int i;
2129
cc5c073a 2130 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
c757faa8
WW		 2131 return;
2132
1bfa26ff
ED		 2133 rcu_read_lock_bh();
2134 spin_lock(&rt6_exception_lock);
cc5c073a 2135 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
c757faa8
WW		 2136 if (bucket) {
2137 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2138 hlist_for_each_entry_safe(rt6_ex, tmp,
2139 &bucket->chain, hlist) {
2140 rt6_age_examine_exception(bucket, rt6_ex,
2141 gc_args, now);
2142 }
2143 bucket++;
2144 }
2145 }
1bfa26ff
ED		 2146 spin_unlock(&rt6_exception_lock);
2147 rcu_read_unlock_bh();
c757faa8
WW		 2148}
2149
e659ba31
DA		 2150struct fib6_nh_age_excptn_arg {
2151 struct fib6_gc_args *gc_args;
2152 unsigned long now;
2153};
2154
2155static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg)
2156{
2157 struct fib6_nh_age_excptn_arg *arg = _arg;
2158
2159 fib6_nh_age_exceptions(nh, arg->gc_args, arg->now);
2160 return 0;
2161}
2162
cc5c073a 2163void rt6_age_exceptions(struct fib6_info *f6i,
c0b220cf
DA		 2164 struct fib6_gc_args *gc_args,
2165 unsigned long now)
2166{
e659ba31
DA		 2167 if (f6i->nh) {
2168 struct fib6_nh_age_excptn_arg arg = {
2169 .gc_args = gc_args,
2170 .now = now
2171 };
2172
2173 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions,
2174 &arg);
2175 } else {
2176 fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now);
2177 }
c0b220cf
DA		 2178}
2179
1d053da9 2180/* must be called with rcu lock held */
effda4dd
DA		 2181int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif,
2182 struct flowi6 *fl6, struct fib6_result *res, int strict)
1da177e4 2183{
367efcb9 2184 struct fib6_node *fn, *saved_fn;
1da177e4 2185
6454743b 2186 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
367efcb9 2187 saved_fn = fn;
1da177e4 2188
ca254490
DA		 2189 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
2190 oif = 0;
2191
a3c00e46 2192redo_rt6_select:
effda4dd
DA		 2193 rt6_select(net, fn, oif, res, strict);
2194 if (res->f6i == net->ipv6.fib6_null_entry) {
a3c00e46
MKL		 2195 fn = fib6_backtrack(fn, &fl6->saddr);
2196 if (fn)
2197 goto redo_rt6_select;
367efcb9
MKL		 2198 else if (strict & RT6_LOOKUP_F_REACHABLE) {
2199 /* also consider unreachable route */
2200 strict &= ~RT6_LOOKUP_F_REACHABLE;
2201 fn = saved_fn;
2202 goto redo_rt6_select;
367efcb9 2203 }
a3c00e46
MKL		 2204 }
2205
effda4dd 2206 trace_fib6_table_lookup(net, res, table, fl6);
fb9de91e 2207
effda4dd 2208 return 0;
1d053da9
DA		 2209}
2210
2211struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
2212 int oif, struct flowi6 *fl6,
2213 const struct sk_buff *skb, int flags)
2214{
b1d40991 2215 struct fib6_result res = {};
0e09edcc 2216 struct rt6_info *rt = NULL;
1d053da9
DA		 2217 int strict = 0;
2218
0e09edcc
WW		 2219 WARN_ON_ONCE((flags & RT6_LOOKUP_F_DST_NOREF) &&
2220 !rcu_read_lock_held());
2221
1d053da9
DA		 2222 strict |= flags & RT6_LOOKUP_F_IFACE;
2223 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
2224 if (net->ipv6.devconf_all->forwarding == 0)
2225 strict |= RT6_LOOKUP_F_REACHABLE;
2226
2227 rcu_read_lock();
2228
effda4dd 2229 fib6_table_lookup(net, table, oif, fl6, &res, strict);
0e09edcc
WW		 2230 if (res.f6i == net->ipv6.fib6_null_entry)
2231 goto out;
23fb93a4 2232
b1d40991 2233 fib6_select_path(net, &res, fl6, oif, false, skb, strict);
d83009d4 2234
23fb93a4 2235 /*Search through exception table */
7e4b5128 2236 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
23fb93a4 2237 if (rt) {
0e09edcc 2238 goto out;
3da59bd9 2239 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
b1d40991 2240 !res.nh->fib_nh_gw_family)) {
3da59bd9
MKL		 2241 /* Create a RTF_CACHE clone which will not be
2242 * owned by the fib6 tree. It is for the special case where
2243 * the daddr in the skb during the neighbor look-up is different
2244 * from the fl6->daddr used to look-up route here.
2245 */
0e09edcc 2246 rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL);
c71099ac 2247
0e09edcc
WW		 2248 if (rt) {
2249 /* 1 refcnt is taken during ip6_rt_cache_alloc().
2250 * As rt6_uncached_list_add() does not consume refcnt,
2251 * this refcnt is always returned to the caller even
2252 * if caller sets RT6_LOOKUP_F_DST_NOREF flag.
1cfb71ee 2253 */
0e09edcc 2254 rt6_uncached_list_add(rt);
81eb8447 2255 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
0e09edcc 2256 rcu_read_unlock();
b811580d 2257
0e09edcc
WW		 2258 return rt;
2259 }
d52d3997
MKL		 2260 } else {
2261 /* Get a percpu copy */
951f788a 2262 local_bh_disable();
0e09edcc 2263 rt = rt6_get_pcpu_route(&res);
d52d3997 2264
0e09edcc
WW		 2265 if (!rt)
2266 rt = rt6_make_pcpu_route(net, &res);
93531c67 2267
951f788a 2268 local_bh_enable();
d52d3997 2269 }
0e09edcc
WW		 2270out:
2271 if (!rt)
2272 rt = net->ipv6.ip6_null_entry;
2273 if (!(flags & RT6_LOOKUP_F_DST_NOREF))
2274 ip6_hold_safe(net, &rt);
2275 rcu_read_unlock();
2276
2277 return rt;
1da177e4 2278}
9ff74384 2279EXPORT_SYMBOL_GPL(ip6_pol_route);
1da177e4 2280
55cced4f 2281INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_input(struct net *net,
b75cc8f9
DA		 2282 struct fib6_table *table,
2283 struct flowi6 *fl6,
2284 const struct sk_buff *skb,
2285 int flags)
4acad72d 2286{
b75cc8f9 2287 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags);
4acad72d
PE		 2288}
2289
d409b847
MB		 2290struct dst_entry *ip6_route_input_lookup(struct net *net,
2291 struct net_device *dev,
b75cc8f9
DA		 2292 struct flowi6 *fl6,
2293 const struct sk_buff *skb,
2294 int flags)
72331bc0
SL		 2295{
2296 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
2297 flags |= RT6_LOOKUP_F_IFACE;
2298
b75cc8f9 2299 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input);
72331bc0 2300}
d409b847 2301EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
72331bc0 2302
23aebdac 2303static void ip6_multipath_l3_keys(const struct sk_buff *skb,
5e5d6fed
RP		 2304 struct flow_keys *keys,
2305 struct flow_keys *flkeys)
23aebdac
JS		 2306{
2307 const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
2308 const struct ipv6hdr *key_iph = outer_iph;
5e5d6fed 2309 struct flow_keys *_flkeys = flkeys;
23aebdac
JS		 2310 const struct ipv6hdr *inner_iph;
2311 const struct icmp6hdr *icmph;
2312 struct ipv6hdr _inner_iph;
cea67a2d 2313 struct icmp6hdr _icmph;
23aebdac
JS		 2314
2315 if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6))
2316 goto out;
2317
cea67a2d
ED		 2318 icmph = skb_header_pointer(skb, skb_transport_offset(skb),
2319 sizeof(_icmph), &_icmph);
2320 if (!icmph)
2321 goto out;
2322
54074f1d 2323 if (!icmpv6_is_err(icmph->icmp6_type))
23aebdac
JS		 2324 goto out;
2325
2326 inner_iph = skb_header_pointer(skb,
2327 skb_transport_offset(skb) + sizeof(*icmph),
2328 sizeof(_inner_iph), &_inner_iph);
2329 if (!inner_iph)
2330 goto out;
2331
2332 key_iph = inner_iph;
5e5d6fed 2333 _flkeys = NULL;
23aebdac 2334out:
5e5d6fed
RP		 2335 if (_flkeys) {
2336 keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src;
2337 keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst;
2338 keys->tags.flow_label = _flkeys->tags.flow_label;
2339 keys->basic.ip_proto = _flkeys->basic.ip_proto;
2340 } else {
2341 keys->addrs.v6addrs.src = key_iph->saddr;
2342 keys->addrs.v6addrs.dst = key_iph->daddr;
fa1be7e0 2343 keys->tags.flow_label = ip6_flowlabel(key_iph);
5e5d6fed
RP		 2344 keys->basic.ip_proto = key_iph->nexthdr;
2345 }
23aebdac
JS		 2346}
2347
2348/* if skb is set it will be used and fl6 can be NULL */
b4bac172
DA		 2349u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
2350 const struct sk_buff *skb, struct flow_keys *flkeys)
23aebdac
JS		 2351{
2352 struct flow_keys hash_keys;
9a2a537a 2353 u32 mhash;
23aebdac 2354
bbfa047a 2355 switch (ip6_multipath_hash_policy(net)) {
b4bac172
DA		 2356 case 0:
2357 memset(&hash_keys, 0, sizeof(hash_keys));
2358 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2359 if (skb) {
2360 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2361 } else {
2362 hash_keys.addrs.v6addrs.src = fl6->saddr;
2363 hash_keys.addrs.v6addrs.dst = fl6->daddr;
fa1be7e0 2364 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
b4bac172
DA		 2365 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2366 }
2367 break;
2368 case 1:
2369 if (skb) {
2370 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
2371 struct flow_keys keys;
2372
2373 /* short-circuit if we already have L4 hash present */
2374 if (skb->l4_hash)
2375 return skb_get_hash_raw(skb) >> 1;
2376
2377 memset(&hash_keys, 0, sizeof(hash_keys));
2378
2379 if (!flkeys) {
2380 skb_flow_dissect_flow_keys(skb, &keys, flag);
2381 flkeys = &keys;
2382 }
2383 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2384 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2385 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2386 hash_keys.ports.src = flkeys->ports.src;
2387 hash_keys.ports.dst = flkeys->ports.dst;
2388 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2389 } else {
2390 memset(&hash_keys, 0, sizeof(hash_keys));
2391 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2392 hash_keys.addrs.v6addrs.src = fl6->saddr;
2393 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2394 hash_keys.ports.src = fl6->fl6_sport;
2395 hash_keys.ports.dst = fl6->fl6_dport;
2396 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2397 }
2398 break;
d8f74f09
SS		 2399 case 2:
2400 memset(&hash_keys, 0, sizeof(hash_keys));
2401 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2402 if (skb) {
2403 struct flow_keys keys;
2404
2405 if (!flkeys) {
2406 skb_flow_dissect_flow_keys(skb, &keys, 0);
2407 flkeys = &keys;
2408 }
2409
2410 /* Inner can be v4 or v6 */
2411 if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
2412 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
2413 hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src;
2414 hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst;
2415 } else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
2416 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2417 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2418 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2419 hash_keys.tags.flow_label = flkeys->tags.flow_label;
2420 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2421 } else {
2422 /* Same as case 0 */
2423 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2424 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2425 }
2426 } else {
2427 /* Same as case 0 */
2428 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2429 hash_keys.addrs.v6addrs.src = fl6->saddr;
2430 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2431 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2432 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2433 }
2434 break;
23aebdac 2435 }
9a2a537a 2436 mhash = flow_hash_from_keys(&hash_keys);
23aebdac 2437
9a2a537a 2438 return mhash >> 1;
23aebdac
JS		 2439}
2440
67f415dd 2441/* Called with rcu held */
c71099ac
TG		 2442void ip6_route_input(struct sk_buff *skb)
2443{
b71d1d42 2444 const struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 2445 struct net *net = dev_net(skb->dev);
67f415dd 2446 int flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_DST_NOREF;
904af04d 2447 struct ip_tunnel_info *tun_info;
4c9483b2 2448 struct flowi6 fl6 = {
e0d56fdd 2449 .flowi6_iif = skb->dev->ifindex,
4c9483b2
DM		 2450 .daddr = iph->daddr,
2451 .saddr = iph->saddr,
6502ca52 2452 .flowlabel = ip6_flowinfo(iph),
4c9483b2
DM		 2453 .flowi6_mark = skb->mark,
2454 .flowi6_proto = iph->nexthdr,
c71099ac 2455 };
5e5d6fed 2456 struct flow_keys *flkeys = NULL, _flkeys;
adaa70bb 2457
904af04d 2458 tun_info = skb_tunnel_info(skb);
46fa062a 2459 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
904af04d 2460 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
5e5d6fed
RP		 2461
2462 if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys))
2463 flkeys = &_flkeys;
2464
23aebdac 2465 if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6))
b4bac172 2466 fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys);
06e9d040 2467 skb_dst_drop(skb);
67f415dd
WW		 2468 skb_dst_set_noref(skb, ip6_route_input_lookup(net, skb->dev,
2469 &fl6, skb, flags));
c71099ac
TG		 2470}
2471
55cced4f 2472INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_output(struct net *net,
b75cc8f9
DA		 2473 struct fib6_table *table,
2474 struct flowi6 *fl6,
2475 const struct sk_buff *skb,
2476 int flags)
1da177e4 2477{
b75cc8f9 2478 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags);
c71099ac
TG		 2479}
2480
7d9e5f42
WW		 2481struct dst_entry *ip6_route_output_flags_noref(struct net *net,
2482 const struct sock *sk,
2483 struct flowi6 *fl6, int flags)
c71099ac 2484{
d46a9d67 2485 bool any_src;
c71099ac 2486
3ede0bbc
RS		 2487 if (ipv6_addr_type(&fl6->daddr) &
2488 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) {
4c1feac5
DA		 2489 struct dst_entry *dst;
2490
7d9e5f42 2491 /* This function does not take refcnt on the dst */
4c1feac5
DA		 2492 dst = l3mdev_link_scope_lookup(net, fl6);
2493 if (dst)
2494 return dst;
2495 }
ca254490 2496
1fb9489b 2497 fl6->flowi6_iif = LOOPBACK_IFINDEX;
4dc27d1c 2498
7d9e5f42 2499 flags |= RT6_LOOKUP_F_DST_NOREF;
d46a9d67 2500 any_src = ipv6_addr_any(&fl6->saddr);
741a11d9 2501 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
d46a9d67 2502 (fl6->flowi6_oif && any_src))
77d16f45 2503 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 2504
d46a9d67 2505 if (!any_src)
adaa70bb 2506 flags |= RT6_LOOKUP_F_HAS_SADDR;
0c9a2ac1
YH		 2507 else if (sk)
2508 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
adaa70bb 2509
b75cc8f9 2510 return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output);
1da177e4 2511}
7d9e5f42
WW		 2512EXPORT_SYMBOL_GPL(ip6_route_output_flags_noref);
2513
2514struct dst_entry *ip6_route_output_flags(struct net *net,
2515 const struct sock *sk,
2516 struct flowi6 *fl6,
2517 int flags)
2518{
2519 struct dst_entry *dst;
2520 struct rt6_info *rt6;
2521
2522 rcu_read_lock();
2523 dst = ip6_route_output_flags_noref(net, sk, fl6, flags);
2524 rt6 = (struct rt6_info *)dst;
2525 /* For dst cached in uncached_list, refcnt is already taken. */
2526 if (list_empty(&rt6->rt6i_uncached) && !dst_hold_safe(dst)) {
2527 dst = &net->ipv6.ip6_null_entry->dst;
2528 dst_hold(dst);
2529 }
2530 rcu_read_unlock();
2531
2532 return dst;
2533}
6f21c96a 2534EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1da177e4 2535
2774c131 2536struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
14e50e57 2537{
5c1e6aa3 2538 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1dbe3252 2539 struct net_device *loopback_dev = net->loopback_dev;
14e50e57
DM		 2540 struct dst_entry *new = NULL;
2541
1dbe3252 2542 rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
62cf27e5 2543 DST_OBSOLETE_DEAD, 0);
14e50e57 2544 if (rt) {
0a1f5962 2545 rt6_info_init(rt);
81eb8447 2546 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
8104891b 2547
0a1f5962 2548 new = &rt->dst;
14e50e57 2549 new->__use = 1;
352e512c 2550 new->input = dst_discard;
ede2059d 2551 new->output = dst_discard_out;
14e50e57 2552
0a1f5962 2553 dst_copy_metrics(new, &ort->dst);
14e50e57 2554
1dbe3252 2555 rt->rt6i_idev = in6_dev_get(loopback_dev);
4e3fd7a0 2556 rt->rt6i_gateway = ort->rt6i_gateway;
0a1f5962 2557 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
14e50e57
DM		 2558
2559 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
2560#ifdef CONFIG_IPV6_SUBTREES
2561 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
2562#endif
14e50e57
DM		 2563 }
2564
69ead7af
DM		 2565 dst_release(dst_orig);
2566 return new ? new : ERR_PTR(-ENOMEM);
14e50e57 2567}
14e50e57 2568
1da177e4
LT		 2569/*
2570 * Destination cache support functions
2571 */
2572
8d1c802b 2573static bool fib6_check(struct fib6_info *f6i, u32 cookie)
4b32b5ad 2574{
93531c67
DA		 2575 u32 rt_cookie = 0;
2576
8ae86971 2577 if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie)
93531c67
DA		 2578 return false;
2579
2580 if (fib6_check_expired(f6i))
2581 return false;
2582
2583 return true;
4b32b5ad
MKL		 2584}
2585
a68886a6
DA		 2586static struct dst_entry *rt6_check(struct rt6_info *rt,
2587 struct fib6_info *from,
2588 u32 cookie)
3da59bd9 2589{
36143645 2590 u32 rt_cookie = 0;
c5cff856 2591
49d05fe2 2592 if (!from || !fib6_get_cookie_safe(from, &rt_cookie) ||
93531c67 2593 rt_cookie != cookie)
3da59bd9
MKL		 2594 return NULL;
2595
2596 if (rt6_check_expired(rt))
2597 return NULL;
2598
2599 return &rt->dst;
2600}
2601
a68886a6
DA		 2602static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt,
2603 struct fib6_info *from,
2604 u32 cookie)
3da59bd9 2605{
5973fb1e
MKL		 2606 if (!__rt6_check_expired(rt) &&
2607 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
a68886a6 2608 fib6_check(from, cookie))
3da59bd9
MKL		 2609 return &rt->dst;
2610 else
2611 return NULL;
2612}
2613
1da177e4
LT		 2614static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
2615{
a87b7dc9 2616 struct dst_entry *dst_ret;
a68886a6 2617 struct fib6_info *from;
1da177e4
LT		 2618 struct rt6_info *rt;
2619
a87b7dc9
DA		 2620 rt = container_of(dst, struct rt6_info, dst);
2621
8f34e53b
DA		 2622 if (rt->sernum)
2623 return rt6_is_valid(rt) ? dst : NULL;
2624
a87b7dc9 2625 rcu_read_lock();
1da177e4 2626
6f3118b5
ND		 2627 /* All IPV6 dsts are created with ->obsolete set to the value
2628 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
2629 * into this function always.
2630 */
e3bc10bd 2631
a68886a6 2632 from = rcu_dereference(rt->from);
4b32b5ad 2633
a68886a6
DA		 2634 if (from && (rt->rt6i_flags & RTF_PCPU ||
2635 unlikely(!list_empty(&rt->rt6i_uncached))))
2636 dst_ret = rt6_dst_from_check(rt, from, cookie);
3da59bd9 2637 else
a68886a6 2638 dst_ret = rt6_check(rt, from, cookie);
a87b7dc9
DA		 2639
2640 rcu_read_unlock();
2641
2642 return dst_ret;
1da177e4
LT		 2643}
2644
2645static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
2646{
2647 struct rt6_info *rt = (struct rt6_info *) dst;
2648
2649 if (rt) {
54c1a859 2650 if (rt->rt6i_flags & RTF_CACHE) {
c3c14da0 2651 rcu_read_lock();
54c1a859 2652 if (rt6_check_expired(rt)) {
93531c67 2653 rt6_remove_exception_rt(rt);
54c1a859
YH		 2654 dst = NULL;
2655 }
c3c14da0 2656 rcu_read_unlock();
54c1a859 2657 } else {
1da177e4 2658 dst_release(dst);
54c1a859
YH		 2659 dst = NULL;
2660 }
1da177e4 2661 }
54c1a859 2662 return dst;
1da177e4
LT		 2663}
2664
2665static void ip6_link_failure(struct sk_buff *skb)
2666{
2667 struct rt6_info *rt;
2668
3ffe533c 2669 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1da177e4 2670
adf30907 2671 rt = (struct rt6_info *) skb_dst(skb);
1da177e4 2672 if (rt) {
8a14e46f 2673 rcu_read_lock();
1eb4f758 2674 if (rt->rt6i_flags & RTF_CACHE) {
761f6026 2675 rt6_remove_exception_rt(rt);
c5cff856 2676 } else {
a68886a6 2677 struct fib6_info *from;
c5cff856
WW		 2678 struct fib6_node *fn;
2679
a68886a6
DA		 2680 from = rcu_dereference(rt->from);
2681 if (from) {
2682 fn = rcu_dereference(from->fib6_node);
2683 if (fn && (rt->rt6i_flags & RTF_DEFAULT))
2684 fn->fn_sernum = -1;
2685 }
1eb4f758 2686 }
8a14e46f 2687 rcu_read_unlock();
1da177e4
LT		 2688 }
2689}
2690
6a3e030f
DA		 2691static void rt6_update_expires(struct rt6_info *rt0, int timeout)
2692{
a68886a6
DA		 2693 if (!(rt0->rt6i_flags & RTF_EXPIRES)) {
2694 struct fib6_info *from;
2695
2696 rcu_read_lock();
2697 from = rcu_dereference(rt0->from);
2698 if (from)
2699 rt0->dst.expires = from->expires;
2700 rcu_read_unlock();
2701 }
6a3e030f
DA		 2702
2703 dst_set_expires(&rt0->dst, timeout);
2704 rt0->rt6i_flags |= RTF_EXPIRES;
2705}
2706
45e4fd26
MKL		 2707static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
2708{
2709 struct net *net = dev_net(rt->dst.dev);
2710
d4ead6b3 2711 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
45e4fd26 2712 rt->rt6i_flags |= RTF_MODIFIED;
45e4fd26
MKL		 2713 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
2714}
2715
0d3f6d29
MKL		 2716static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
2717{
2718 return !(rt->rt6i_flags & RTF_CACHE) &&
1490ed2a 2719 (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from));
0d3f6d29
MKL		 2720}
2721
45e4fd26 2722static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
bd085ef6
HL		 2723 const struct ipv6hdr *iph, u32 mtu,
2724 bool confirm_neigh)
1da177e4 2725{
0dec879f 2726 const struct in6_addr *daddr, *saddr;
67ba4152 2727 struct rt6_info *rt6 = (struct rt6_info *)dst;
1da177e4 2728
09454fd0
MŻ		 2729 /* Note: do *NOT* check dst_metric_locked(dst, RTAX_MTU)
2730 * IPv6 pmtu discovery isn't optional, so 'mtu lock' cannot disable it.
2731 * [see also comment in rt6_mtu_change_route()]
2732 */
19bda36c 2733
0dec879f
JA		 2734 if (iph) {
2735 daddr = &iph->daddr;
2736 saddr = &iph->saddr;
2737 } else if (sk) {
2738 daddr = &sk->sk_v6_daddr;
2739 saddr = &inet6_sk(sk)->saddr;
2740 } else {
2741 daddr = NULL;
2742 saddr = NULL;
2743 }
bd085ef6
HL		 2744
2745 if (confirm_neigh)
2746 dst_confirm_neigh(dst, daddr);
2747
45e4fd26
MKL		 2748 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
2749 if (mtu >= dst_mtu(dst))
2750 return;
9d289715 2751
0d3f6d29 2752 if (!rt6_cache_allowed_for_pmtu(rt6)) {
45e4fd26 2753 rt6_do_update_pmtu(rt6, mtu);
2b760fcf
WW		 2754 /* update rt6_ex->stamp for cache */
2755 if (rt6->rt6i_flags & RTF_CACHE)
2756 rt6_update_exception_stamp_rt(rt6);
0dec879f 2757 } else if (daddr) {
85bd05de 2758 struct fib6_result res = {};
45e4fd26
MKL		 2759 struct rt6_info *nrt6;
2760
4d85cd0c 2761 rcu_read_lock();
85bd05de 2762 res.f6i = rcu_dereference(rt6->from);
43a4b60d
DA		 2763 if (!res.f6i)
2764 goto out_unlock;
2765
7d21fec9
DA		 2766 res.fib6_flags = res.f6i->fib6_flags;
2767 res.fib6_type = res.f6i->fib6_type;
2768
2d44234b
DA		 2769 if (res.f6i->nh) {
2770 struct fib6_nh_match_arg arg = {
2771 .dev = dst->dev,
2772 .gw = &rt6->rt6i_gateway,
2773 };
2774
2775 nexthop_for_each_fib6_nh(res.f6i->nh,
2776 fib6_nh_find_match, &arg);
2777
2778 /* fib6_info uses a nexthop that does not have fib6_nh
2779 * using the dst->dev + gw. Should be impossible.
2780 */
43a4b60d
DA		 2781 if (!arg.match)
2782 goto out_unlock;
2d44234b
DA		 2783
2784 res.nh = arg.match;
2785 } else {
2786 res.nh = res.f6i->fib6_nh;
2787 }
2788
85bd05de 2789 nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr);
45e4fd26
MKL		 2790 if (nrt6) {
2791 rt6_do_update_pmtu(nrt6, mtu);
5012f0a5 2792 if (rt6_insert_exception(nrt6, &res))
2b760fcf 2793 dst_release_immediate(&nrt6->dst);
45e4fd26 2794 }
43a4b60d 2795out_unlock:
a68886a6 2796 rcu_read_unlock();
1da177e4
LT		 2797 }
2798}
2799
45e4fd26 2800static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
bd085ef6
HL		 2801 struct sk_buff *skb, u32 mtu,
2802 bool confirm_neigh)
45e4fd26 2803{
bd085ef6
HL		 2804 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu,
2805 confirm_neigh);
45e4fd26
MKL		 2806}
2807
42ae66c8 2808void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
e2d118a1 2809 int oif, u32 mark, kuid_t uid)
81aded24
DM		 2810{
2811 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
2812 struct dst_entry *dst;
dc92095d
MŻ		 2813 struct flowi6 fl6 = {
2814 .flowi6_oif = oif,
2815 .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark),
2816 .daddr = iph->daddr,
2817 .saddr = iph->saddr,
2818 .flowlabel = ip6_flowinfo(iph),
2819 .flowi6_uid = uid,
2820 };
81aded24
DM		 2821
2822 dst = ip6_route_output(net, NULL, &fl6);
2823 if (!dst->error)
bd085ef6 2824 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu), true);
81aded24
DM		 2825 dst_release(dst);
2826}
2827EXPORT_SYMBOL_GPL(ip6_update_pmtu);
2828
2829void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
2830{
7ddacfa5 2831 int oif = sk->sk_bound_dev_if;
33c162a9
MKL		 2832 struct dst_entry *dst;
2833
7ddacfa5
DA		 2834 if (!oif && skb->dev)
2835 oif = l3mdev_master_ifindex(skb->dev);
2836
2837 ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid);
33c162a9
MKL		 2838
2839 dst = __sk_dst_get(sk);
2840 if (!dst || !dst->obsolete ||
2841 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
2842 return;
2843
2844 bh_lock_sock(sk);
2845 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
2846 ip6_datagram_dst_update(sk, false);
2847 bh_unlock_sock(sk);
81aded24
DM		 2848}
2849EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
2850
7d6850f7
AK		 2851void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
2852 const struct flowi6 *fl6)
2853{
2854#ifdef CONFIG_IPV6_SUBTREES
2855 struct ipv6_pinfo *np = inet6_sk(sk);
2856#endif
2857
2858 ip6_dst_store(sk, dst,
2859 ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
2860 &sk->sk_v6_daddr : NULL,
2861#ifdef CONFIG_IPV6_SUBTREES
2862 ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
2863 &np->saddr :
2864#endif
2865 NULL);
2866}
2867
9b6b35ab 2868static bool ip6_redirect_nh_match(const struct fib6_result *res,
0b34eb00
DA		 2869 struct flowi6 *fl6,
2870 const struct in6_addr *gw,
2871 struct rt6_info **ret)
2872{
9b6b35ab
DA		 2873 const struct fib6_nh *nh = res->nh;
2874
0b34eb00
DA		 2875 if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family ||
2876 fl6->flowi6_oif != nh->fib_nh_dev->ifindex)
2877 return false;
2878
2879 /* rt_cache's gateway might be different from its 'parent'
2880 * in the case of an ip redirect.
2881 * So we keep searching in the exception table if the gateway
2882 * is different.
2883 */
2884 if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) {
2885 struct rt6_info *rt_cache;
2886
9b6b35ab 2887 rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr);
0b34eb00
DA		 2888 if (rt_cache &&
2889 ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) {
2890 *ret = rt_cache;
2891 return true;
2892 }
2893 return false;
2894 }
2895 return true;
2896}
2897
c55c8988
DA		 2898struct fib6_nh_rd_arg {
2899 struct fib6_result *res;
2900 struct flowi6 *fl6;
2901 const struct in6_addr *gw;
2902 struct rt6_info **ret;
2903};
2904
2905static int fib6_nh_redirect_match(struct fib6_nh *nh, void *_arg)
2906{
2907 struct fib6_nh_rd_arg *arg = _arg;
2908
2909 arg->res->nh = nh;
2910 return ip6_redirect_nh_match(arg->res, arg->fl6, arg->gw, arg->ret);
2911}
2912
b55b76b2
DJ		 2913/* Handle redirects */
2914struct ip6rd_flowi {
2915 struct flowi6 fl6;
2916 struct in6_addr gateway;
2917};
2918
55cced4f 2919INDIRECT_CALLABLE_SCOPE struct rt6_info *__ip6_route_redirect(struct net *net,
b55b76b2
DJ		 2920 struct fib6_table *table,
2921 struct flowi6 *fl6,
b75cc8f9 2922 const struct sk_buff *skb,
b55b76b2
DJ		 2923 int flags)
2924{
2925 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
0b34eb00 2926 struct rt6_info *ret = NULL;
9b6b35ab 2927 struct fib6_result res = {};
c55c8988
DA		 2928 struct fib6_nh_rd_arg arg = {
2929 .res = &res,
2930 .fl6 = fl6,
2931 .gw = &rdfl->gateway,
2932 .ret = &ret
2933 };
8d1c802b 2934 struct fib6_info *rt;
b55b76b2
DJ		 2935 struct fib6_node *fn;
2936
31680ac2
DA		 2937 /* l3mdev_update_flow overrides oif if the device is enslaved; in
2938 * this case we must match on the real ingress device, so reset it
2939 */
2940 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
2941 fl6->flowi6_oif = skb->dev->ifindex;
2942
b55b76b2 2943 /* Get the "current" route for this destination and
67c408cf 2944 * check if the redirect has come from appropriate router.
b55b76b2
DJ		 2945 *
2946 * RFC 4861 specifies that redirects should only be
2947 * accepted if they come from the nexthop to the target.
2948 * Due to the way the routes are chosen, this notion
2949 * is a bit fuzzy and one might need to check all possible
2950 * routes.
2951 */
2952
66f5d6ce 2953 rcu_read_lock();
6454743b 2954 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
b55b76b2 2955restart:
66f5d6ce 2956 for_each_fib6_node_rt_rcu(fn) {
9b6b35ab 2957 res.f6i = rt;
14895687 2958 if (fib6_check_expired(rt))
b55b76b2 2959 continue;
93c2fb25 2960 if (rt->fib6_flags & RTF_REJECT)
b55b76b2 2961 break;
c55c8988
DA		 2962 if (unlikely(rt->nh)) {
2963 if (nexthop_is_blackhole(rt->nh))
2964 continue;
2965 /* on match, res->nh is filled in and potentially ret */
2966 if (nexthop_for_each_fib6_nh(rt->nh,
2967 fib6_nh_redirect_match,
2968 &arg))
2969 goto out;
2970 } else {
2971 res.nh = rt->fib6_nh;
2972 if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway,
2973 &ret))
2974 goto out;
2975 }
b55b76b2
DJ		 2976 }
2977
2978 if (!rt)
421842ed 2979 rt = net->ipv6.fib6_null_entry;
93c2fb25 2980 else if (rt->fib6_flags & RTF_REJECT) {
23fb93a4 2981 ret = net->ipv6.ip6_null_entry;
b0a1ba59
MKL		 2982 goto out;
2983 }
2984
421842ed 2985 if (rt == net->ipv6.fib6_null_entry) {
a3c00e46
MKL		 2986 fn = fib6_backtrack(fn, &fl6->saddr);
2987 if (fn)
2988 goto restart;
b55b76b2 2989 }
a3c00e46 2990
9b6b35ab 2991 res.f6i = rt;
1cf844c7 2992 res.nh = rt->fib6_nh;
b0a1ba59 2993out:
7d21fec9 2994 if (ret) {
10585b43 2995 ip6_hold_safe(net, &ret);
7d21fec9
DA		 2996 } else {
2997 res.fib6_flags = res.f6i->fib6_flags;
2998 res.fib6_type = res.f6i->fib6_type;
9b6b35ab 2999 ret = ip6_create_rt_rcu(&res);
7d21fec9 3000 }
b55b76b2 3001
66f5d6ce 3002 rcu_read_unlock();
b55b76b2 3003
8ff2e5b2 3004 trace_fib6_table_lookup(net, &res, table, fl6);
23fb93a4 3005 return ret;
b55b76b2
DJ		 3006};
3007
3008static struct dst_entry *ip6_route_redirect(struct net *net,
b75cc8f9
DA		 3009 const struct flowi6 *fl6,
3010 const struct sk_buff *skb,
3011 const struct in6_addr *gateway)
b55b76b2
DJ		 3012{
3013 int flags = RT6_LOOKUP_F_HAS_SADDR;
3014 struct ip6rd_flowi rdfl;
3015
3016 rdfl.fl6 = *fl6;
3017 rdfl.gateway = *gateway;
3018
b75cc8f9 3019 return fib6_rule_lookup(net, &rdfl.fl6, skb,
b55b76b2
DJ		 3020 flags, __ip6_route_redirect);
3021}
3022
e2d118a1
LC		 3023void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
3024 kuid_t uid)
3a5ad2ee
DM		 3025{
3026 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
3027 struct dst_entry *dst;
1f7f10ac
MŻ		 3028 struct flowi6 fl6 = {
3029 .flowi6_iif = LOOPBACK_IFINDEX,
3030 .flowi6_oif = oif,
3031 .flowi6_mark = mark,
3032 .daddr = iph->daddr,
3033 .saddr = iph->saddr,
3034 .flowlabel = ip6_flowinfo(iph),
3035 .flowi6_uid = uid,
3036 };
3a5ad2ee 3037
b75cc8f9 3038 dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr);
b55b76b2 3039 rt6_do_redirect(dst, NULL, skb);
3a5ad2ee
DM		 3040 dst_release(dst);
3041}
3042EXPORT_SYMBOL_GPL(ip6_redirect);
3043
d456336d 3044void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif)
c92a59ec
DJ		 3045{
3046 const struct ipv6hdr *iph = ipv6_hdr(skb);
3047 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
3048 struct dst_entry *dst;
0b26fb17
MŻ		 3049 struct flowi6 fl6 = {
3050 .flowi6_iif = LOOPBACK_IFINDEX,
3051 .flowi6_oif = oif,
0b26fb17
MŻ		 3052 .daddr = msg->dest,
3053 .saddr = iph->daddr,
3054 .flowi6_uid = sock_net_uid(net, NULL),
3055 };
c92a59ec 3056
b75cc8f9 3057 dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr);
b55b76b2 3058 rt6_do_redirect(dst, NULL, skb);
c92a59ec
DJ		 3059 dst_release(dst);
3060}
3061
3a5ad2ee
DM		 3062void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
3063{
e2d118a1
LC		 3064 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
3065 sk->sk_uid);
3a5ad2ee
DM		 3066}
3067EXPORT_SYMBOL_GPL(ip6_sk_redirect);
3068
0dbaee3b 3069static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1da177e4 3070{
0dbaee3b
DM		 3071 struct net_device *dev = dst->dev;
3072 unsigned int mtu = dst_mtu(dst);
3073 struct net *net = dev_net(dev);
3074
1da177e4
LT		 3075 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
3076
5578689a
DL		 3077 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
3078 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 3079
3080 /*
1ab1457c
YH		 3081 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
3082 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
3083 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 3084 * rely only on pmtu discovery"
3085 */
3086 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
3087 mtu = IPV6_MAXPLEN;
3088 return mtu;
3089}
3090
ebb762f2 3091static unsigned int ip6_mtu(const struct dst_entry *dst)
d33e4553 3092{
d33e4553 3093 struct inet6_dev *idev;
d4ead6b3 3094 unsigned int mtu;
4b32b5ad
MKL		 3095
3096 mtu = dst_metric_raw(dst, RTAX_MTU);
618f9bc7 3097 if (mtu)
30f78d8e 3098 goto out;
618f9bc7
SK		 3099
3100 mtu = IPV6_MIN_MTU;
d33e4553
DM		 3101
3102 rcu_read_lock();
3103 idev = __in6_dev_get(dst->dev);
3104 if (idev)
3105 mtu = idev->cnf.mtu6;
3106 rcu_read_unlock();
3107
30f78d8e 3108out:
14972cbd
RP		 3109 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
3110
3111 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
d33e4553
DM		 3112}
3113
901731b8
DA		 3114/* MTU selection:
3115 * 1. mtu on route is locked - use it
3116 * 2. mtu from nexthop exception
3117 * 3. mtu from egress device
3118 *
3119 * based on ip6_dst_mtu_forward and exception logic of
3120 * rt6_find_cached_rt; called with rcu_read_lock
3121 */
b748f260
DA		 3122u32 ip6_mtu_from_fib6(const struct fib6_result *res,
3123 const struct in6_addr *daddr,
3124 const struct in6_addr *saddr)
901731b8 3125{
b748f260
DA		 3126 const struct fib6_nh *nh = res->nh;
3127 struct fib6_info *f6i = res->f6i;
901731b8 3128 struct inet6_dev *idev;
510e2ced 3129 struct rt6_info *rt;
901731b8
DA		 3130 u32 mtu = 0;
3131
3132 if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) {
3133 mtu = f6i->fib6_pmtu;
3134 if (mtu)
3135 goto out;
3136 }
3137
510e2ced
WW		 3138 rt = rt6_find_cached_rt(res, daddr, saddr);
3139 if (unlikely(rt)) {
3140 mtu = dst_metric_raw(&rt->dst, RTAX_MTU);
3141 } else {
b748f260 3142 struct net_device *dev = nh->fib_nh_dev;
901731b8
DA		 3143
3144 mtu = IPV6_MIN_MTU;
3145 idev = __in6_dev_get(dev);
3146 if (idev && idev->cnf.mtu6 > mtu)
3147 mtu = idev->cnf.mtu6;
3148 }
3149
3150 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
3151out:
b748f260 3152 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
901731b8
DA		 3153}
3154
3b00944c 3155struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
87a11578 3156 struct flowi6 *fl6)
1da177e4 3157{
87a11578 3158 struct dst_entry *dst;
1da177e4
LT		 3159 struct rt6_info *rt;
3160 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 3161 struct net *net = dev_net(dev);
1da177e4 3162
38308473 3163 if (unlikely(!idev))
122bdf67 3164 return ERR_PTR(-ENODEV);
1da177e4 3165
ad706862 3166 rt = ip6_dst_alloc(net, dev, 0);
38308473 3167 if (unlikely(!rt)) {
1da177e4 3168 in6_dev_put(idev);
87a11578 3169 dst = ERR_PTR(-ENOMEM);
1da177e4
LT		 3170 goto out;
3171 }
3172
588753f1 3173 rt->dst.input = ip6_input;
8e2ec639 3174 rt->dst.output = ip6_output;
550bab42 3175 rt->rt6i_gateway = fl6->daddr;
87a11578 3176 rt->rt6i_dst.addr = fl6->daddr;
8e2ec639
YZ		 3177 rt->rt6i_dst.plen = 128;
3178 rt->rt6i_idev = idev;
14edd87d 3179 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1da177e4 3180
4c981e28 3181 /* Add this dst into uncached_list so that rt6_disable_ip() can
587fea74
WW		 3182 * do proper release of the net_device
3183 */
3184 rt6_uncached_list_add(rt);
81eb8447 3185 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
1da177e4 3186
87a11578
DM		 3187 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
3188
1da177e4 3189out:
87a11578 3190 return dst;
1da177e4
LT		 3191}
3192
569d3645 3193static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 3194{
86393e52 3195 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
7019b78e
DL		 3196 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
3197 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
3198 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
3199 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
3200 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
fc66f95c 3201 int entries;
7019b78e 3202
fc66f95c 3203 entries = dst_entries_get_fast(ops);
cf86a086
ED		 3204 if (entries > rt_max_size)
3205 entries = dst_entries_get_slow(ops);
3206
49a18d86 3207 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
fc66f95c 3208 entries <= rt_max_size)
1da177e4
LT		 3209 goto out;
3210
6891a346 3211 net->ipv6.ip6_rt_gc_expire++;
14956643 3212 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
fc66f95c
ED		 3213 entries = dst_entries_get_slow(ops);
3214 if (entries < ops->gc_thresh)
7019b78e 3215 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 3216out:
7019b78e 3217 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
fc66f95c 3218 return entries > rt_max_size;
1da177e4
LT		 3219}
3220
b2c709cc
DA		 3221static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg,
3222 const struct in6_addr *gw_addr, u32 tbid,
3223 int flags, struct fib6_result *res)
8c14586f
DA		 3224{
3225 struct flowi6 fl6 = {
3226 .flowi6_oif = cfg->fc_ifindex,
3227 .daddr = *gw_addr,
3228 .saddr = cfg->fc_prefsrc,
3229 };
3230 struct fib6_table *table;
b2c709cc 3231 int err;
8c14586f 3232
f4797b33 3233 table = fib6_get_table(net, tbid);
8c14586f 3234 if (!table)
b2c709cc 3235 return -EINVAL;
8c14586f
DA		 3236
3237 if (!ipv6_addr_any(&cfg->fc_prefsrc))
3238 flags |= RT6_LOOKUP_F_HAS_SADDR;
3239
f4797b33 3240 flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE;
8c14586f 3241
b2c709cc
DA		 3242 err = fib6_table_lookup(net, table, cfg->fc_ifindex, &fl6, res, flags);
3243 if (!err && res->f6i != net->ipv6.fib6_null_entry)
3244 fib6_select_path(net, res, &fl6, cfg->fc_ifindex,
3245 cfg->fc_ifindex != 0, NULL, flags);
8c14586f 3246
b2c709cc 3247 return err;
8c14586f
DA		 3248}
3249
fc1e64e1
DA		 3250static int ip6_route_check_nh_onlink(struct net *net,
3251 struct fib6_config *cfg,
9fbb704c 3252 const struct net_device *dev,
fc1e64e1
DA		 3253 struct netlink_ext_ack *extack)
3254{
b2c709cc 3255 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
fc1e64e1 3256 const struct in6_addr *gw_addr = &cfg->fc_gateway;
b2c709cc 3257 struct fib6_result res = {};
fc1e64e1
DA		 3258 int err;
3259
b2c709cc
DA		 3260 err = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0, &res);
3261 if (!err && !(res.fib6_flags & RTF_REJECT) &&
3262 /* ignore match if it is the default route */
3263 !ipv6_addr_any(&res.f6i->fib6_dst.addr) &&
3264 (res.fib6_type != RTN_UNICAST || dev != res.nh->fib_nh_dev)) {
3265 NL_SET_ERR_MSG(extack,
3266 "Nexthop has invalid gateway or device mismatch");
3267 err = -EINVAL;
fc1e64e1
DA		 3268 }
3269
3270 return err;
3271}
3272
1edce99f
DA		 3273static int ip6_route_check_nh(struct net *net,
3274 struct fib6_config *cfg,
3275 struct net_device **_dev,
3276 struct inet6_dev **idev)
3277{
3278 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3279 struct net_device *dev = _dev ? *_dev : NULL;
b2c709cc
DA		 3280 int flags = RT6_LOOKUP_F_IFACE;
3281 struct fib6_result res = {};
1edce99f
DA		 3282 int err = -EHOSTUNREACH;
3283
3284 if (cfg->fc_table) {
b2c709cc
DA		 3285 err = ip6_nh_lookup_table(net, cfg, gw_addr,
3286 cfg->fc_table, flags, &res);
3287 /* gw_addr can not require a gateway or resolve to a reject
3288 * route. If a device is given, it must match the result.
3289 */
3290 if (err || res.fib6_flags & RTF_REJECT ||
3291 res.nh->fib_nh_gw_family ||
3292 (dev && dev != res.nh->fib_nh_dev))
3293 err = -EHOSTUNREACH;
1edce99f
DA		 3294 }
3295
b2c709cc
DA		 3296 if (err < 0) {
3297 struct flowi6 fl6 = {
3298 .flowi6_oif = cfg->fc_ifindex,
3299 .daddr = *gw_addr,
3300 };
1edce99f 3301
b2c709cc
DA		 3302 err = fib6_lookup(net, cfg->fc_ifindex, &fl6, &res, flags);
3303 if (err || res.fib6_flags & RTF_REJECT ||
3304 res.nh->fib_nh_gw_family)
3305 err = -EHOSTUNREACH;
3306
3307 if (err)
3308 return err;
3309
3310 fib6_select_path(net, &res, &fl6, cfg->fc_ifindex,
3311 cfg->fc_ifindex != 0, NULL, flags);
3312 }
1edce99f 3313
b2c709cc 3314 err = 0;
1edce99f 3315 if (dev) {
b2c709cc
DA		 3316 if (dev != res.nh->fib_nh_dev)
3317 err = -EHOSTUNREACH;
1edce99f 3318 } else {
b2c709cc 3319 *_dev = dev = res.nh->fib_nh_dev;
1edce99f 3320 dev_hold(dev);
b2c709cc 3321 *idev = in6_dev_get(dev);
1edce99f
DA		 3322 }
3323
1edce99f
DA		 3324 return err;
3325}
3326
9fbb704c
DA		 3327static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
3328 struct net_device **_dev, struct inet6_dev **idev,
3329 struct netlink_ext_ack *extack)
3330{
3331 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3332 int gwa_type = ipv6_addr_type(gw_addr);
232378e8 3333 bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true;
9fbb704c 3334 const struct net_device *dev = *_dev;
232378e8 3335 bool need_addr_check = !dev;
9fbb704c
DA		 3336 int err = -EINVAL;
3337
3338 /* if gw_addr is local we will fail to detect this in case
3339 * address is still TENTATIVE (DAD in progress). rt6_lookup()
3340 * will return already-added prefix route via interface that
3341 * prefix route was assigned to, which might be non-loopback.
3342 */
232378e8
DA		 3343 if (dev &&
3344 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3345 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
9fbb704c
DA		 3346 goto out;
3347 }
3348
3349 if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) {
3350 /* IPv6 strictly inhibits using not link-local
3351 * addresses as nexthop address.
3352 * Otherwise, router will not able to send redirects.
3353 * It is very good, but in some (rare!) circumstances
3354 * (SIT, PtP, NBMA NOARP links) it is handy to allow
3355 * some exceptions. --ANK
3356 * We allow IPv4-mapped nexthops to support RFC4798-type
3357 * addressing
3358 */
3359 if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) {
3360 NL_SET_ERR_MSG(extack, "Invalid gateway address");
3361 goto out;
3362 }
3363
b2c709cc
DA		 3364 rcu_read_lock();
3365
9fbb704c
DA		 3366 if (cfg->fc_flags & RTNH_F_ONLINK)
3367 err = ip6_route_check_nh_onlink(net, cfg, dev, extack);
3368 else
3369 err = ip6_route_check_nh(net, cfg, _dev, idev);
3370
b2c709cc
DA		 3371 rcu_read_unlock();
3372
9fbb704c
DA		 3373 if (err)
3374 goto out;
3375 }
3376
3377 /* reload in case device was changed */
3378 dev = *_dev;
3379
3380 err = -EINVAL;
3381 if (!dev) {
3382 NL_SET_ERR_MSG(extack, "Egress device not specified");
3383 goto out;
3384 } else if (dev->flags & IFF_LOOPBACK) {
3385 NL_SET_ERR_MSG(extack,
3386 "Egress device can not be loopback device for this route");
3387 goto out;
3388 }
232378e8
DA		 3389
3390 /* if we did not check gw_addr above, do so now that the
3391 * egress device has been resolved.
3392 */
3393 if (need_addr_check &&
3394 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3395 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
3396 goto out;
3397 }
3398
9fbb704c
DA		 3399 err = 0;
3400out:
3401 return err;
3402}
3403
83c44251
DA		 3404static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type)
3405{
3406 if ((flags & RTF_REJECT) ||
3407 (dev && (dev->flags & IFF_LOOPBACK) &&
3408 !(addr_type & IPV6_ADDR_LOOPBACK) &&
aea23c32 3409 !(flags & (RTF_ANYCAST | RTF_LOCAL))))
83c44251
DA		 3410 return true;
3411
3412 return false;
3413}
3414
3415int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
3416 struct fib6_config *cfg, gfp_t gfp_flags,
3417 struct netlink_ext_ack *extack)
3418{
3419 struct net_device *dev = NULL;
3420 struct inet6_dev *idev = NULL;
3421 int addr_type;
3422 int err;
3423
f1741730 3424 fib6_nh->fib_nh_family = AF_INET6;
1bef4c22
ED		 3425#ifdef CONFIG_IPV6_ROUTER_PREF
3426 fib6_nh->last_probe = jiffies;
3427#endif
38428d68
RP		 3428 if (cfg->fc_is_fdb) {
3429 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
3430 fib6_nh->fib_nh_gw_family = AF_INET6;
3431 return 0;
3432 }
f1741730 3433
83c44251
DA		 3434 err = -ENODEV;
3435 if (cfg->fc_ifindex) {
3436 dev = dev_get_by_index(net, cfg->fc_ifindex);
3437 if (!dev)
3438 goto out;
3439 idev = in6_dev_get(dev);
3440 if (!idev)
3441 goto out;
3442 }
3443
3444 if (cfg->fc_flags & RTNH_F_ONLINK) {
3445 if (!dev) {
3446 NL_SET_ERR_MSG(extack,
3447 "Nexthop device required for onlink");
3448 goto out;
3449 }
3450
3451 if (!(dev->flags & IFF_UP)) {
3452 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3453 err = -ENETDOWN;
3454 goto out;
3455 }
3456
ad1601ae 3457 fib6_nh->fib_nh_flags |= RTNH_F_ONLINK;
83c44251
DA		 3458 }
3459
ad1601ae 3460 fib6_nh->fib_nh_weight = 1;
83c44251
DA		 3461
3462 /* We cannot add true routes via loopback here,
3463 * they would result in kernel looping; promote them to reject routes
3464 */
3465 addr_type = ipv6_addr_type(&cfg->fc_dst);
3466 if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) {
3467 /* hold loopback dev/idev if we haven't done so. */
3468 if (dev != net->loopback_dev) {
3469 if (dev) {
3470 dev_put(dev);
3471 in6_dev_put(idev);
3472 }
3473 dev = net->loopback_dev;
3474 dev_hold(dev);
3475 idev = in6_dev_get(dev);
3476 if (!idev) {
3477 err = -ENODEV;
3478 goto out;
3479 }
3480 }
7dd73168 3481 goto pcpu_alloc;
83c44251
DA		 3482 }
3483
3484 if (cfg->fc_flags & RTF_GATEWAY) {
3485 err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
3486 if (err)
3487 goto out;
3488
ad1601ae 3489 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
bdf00467 3490 fib6_nh->fib_nh_gw_family = AF_INET6;
83c44251
DA		 3491 }
3492
3493 err = -ENODEV;
3494 if (!dev)
3495 goto out;
3496
3497 if (idev->cnf.disable_ipv6) {
3498 NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
3499 err = -EACCES;
3500 goto out;
3501 }
3502
3503 if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) {
3504 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3505 err = -ENETDOWN;
3506 goto out;
3507 }
3508
3509 if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
3510 !netif_carrier_ok(dev))
ad1601ae 3511 fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
83c44251 3512
faee6769 3513 err = fib_nh_common_init(net, &fib6_nh->nh_common, cfg->fc_encap,
7dd73168
DA		 3514 cfg->fc_encap_type, cfg, gfp_flags, extack);
3515 if (err)
3516 goto out;
3517
3518pcpu_alloc:
f40b6ae2
DA		 3519 fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
3520 if (!fib6_nh->rt6i_pcpu) {
3521 err = -ENOMEM;
3522 goto out;
3523 }
3524
ad1601ae 3525 fib6_nh->fib_nh_dev = dev;
f1741730 3526 fib6_nh->fib_nh_oif = dev->ifindex;
83c44251
DA		 3527 err = 0;
3528out:
3529 if (idev)
3530 in6_dev_put(idev);
3531
3532 if (err) {
ad1601ae
DA		 3533 lwtstate_put(fib6_nh->fib_nh_lws);
3534 fib6_nh->fib_nh_lws = NULL;
83c44251
DA		 3535 if (dev)
3536 dev_put(dev);
3537 }
3538
3539 return err;
3540}
3541
dac7d0f2
DA		 3542void fib6_nh_release(struct fib6_nh *fib6_nh)
3543{
cc5c073a
DA		 3544 struct rt6_exception_bucket *bucket;
3545
3546 rcu_read_lock();
3547
3548 fib6_nh_flush_exceptions(fib6_nh, NULL);
3549 bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL);
3550 if (bucket) {
3551 rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL);
3552 kfree(bucket);
3553 }
3554
3555 rcu_read_unlock();
3556
f40b6ae2
DA		 3557 if (fib6_nh->rt6i_pcpu) {
3558 int cpu;
3559
3560 for_each_possible_cpu(cpu) {
3561 struct rt6_info **ppcpu_rt;
3562 struct rt6_info *pcpu_rt;
3563
3564 ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu);
3565 pcpu_rt = *ppcpu_rt;
3566 if (pcpu_rt) {
3567 dst_dev_put(&pcpu_rt->dst);
3568 dst_release(&pcpu_rt->dst);
3569 *ppcpu_rt = NULL;
3570 }
3571 }
3572
3573 free_percpu(fib6_nh->rt6i_pcpu);
3574 }
3575
979e276e 3576 fib_nh_common_release(&fib6_nh->nh_common);
dac7d0f2
DA		 3577}
3578
8d1c802b 3579static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
acb54e3c 3580 gfp_t gfp_flags,
333c4301 3581 struct netlink_ext_ack *extack)
1da177e4 3582{
5578689a 3583 struct net *net = cfg->fc_nlinfo.nl_net;
8d1c802b 3584 struct fib6_info *rt = NULL;
f88d8ea6 3585 struct nexthop *nh = NULL;
c71099ac 3586 struct fib6_table *table;
f88d8ea6 3587 struct fib6_nh *fib6_nh;
8c5b83f0 3588 int err = -EINVAL;
83c44251 3589 int addr_type;
1da177e4 3590
557c44be 3591 /* RTF_PCPU is an internal flag; can not be set by userspace */
d5d531cb
DA		 3592 if (cfg->fc_flags & RTF_PCPU) {
3593 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
557c44be 3594 goto out;
d5d531cb 3595 }
557c44be 3596
2ea2352e
WW		 3597 /* RTF_CACHE is an internal flag; can not be set by userspace */
3598 if (cfg->fc_flags & RTF_CACHE) {
3599 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE");
3600 goto out;
3601 }
3602
e8478e80
DA		 3603 if (cfg->fc_type > RTN_MAX) {
3604 NL_SET_ERR_MSG(extack, "Invalid route type");
3605 goto out;
3606 }
3607
d5d531cb
DA		 3608 if (cfg->fc_dst_len > 128) {
3609 NL_SET_ERR_MSG(extack, "Invalid prefix length");
3610 goto out;
3611 }
3612 if (cfg->fc_src_len > 128) {
3613 NL_SET_ERR_MSG(extack, "Invalid source address length");
8c5b83f0 3614 goto out;
d5d531cb 3615 }
1da177e4 3616#ifndef CONFIG_IPV6_SUBTREES
d5d531cb
DA		 3617 if (cfg->fc_src_len) {
3618 NL_SET_ERR_MSG(extack,
3619 "Specifying source address requires IPV6_SUBTREES to be enabled");
8c5b83f0 3620 goto out;
d5d531cb 3621 }
1da177e4 3622#endif
5b98324e
DA		 3623 if (cfg->fc_nh_id) {
3624 nh = nexthop_find_by_id(net, cfg->fc_nh_id);
3625 if (!nh) {
3626 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
3627 goto out;
3628 }
3629 err = fib6_check_nexthop(nh, cfg, extack);
3630 if (err)
3631 goto out;
3632 }
fc1e64e1 3633
d71314b4 3634 err = -ENOBUFS;
38308473
DM		 3635 if (cfg->fc_nlinfo.nlh &&
3636 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
d71314b4 3637 table = fib6_get_table(net, cfg->fc_table);
38308473 3638 if (!table) {
f3213831 3639 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
d71314b4
MV		 3640 table = fib6_new_table(net, cfg->fc_table);
3641 }
3642 } else {
3643 table = fib6_new_table(net, cfg->fc_table);
3644 }
38308473
DM		 3645
3646 if (!table)
c71099ac 3647 goto out;
c71099ac 3648
93531c67 3649 err = -ENOMEM;
f88d8ea6 3650 rt = fib6_info_alloc(gfp_flags, !nh);
93531c67 3651 if (!rt)
1da177e4 3652 goto out;
93531c67 3653
d7e774f3
DA		 3654 rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len,
3655 extack);
767a2217
DA		 3656 if (IS_ERR(rt->fib6_metrics)) {
3657 err = PTR_ERR(rt->fib6_metrics);
fda21d46
ED		 3658 /* Do not leave garbage there. */
3659 rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
767a2217
DA		 3660 goto out;
3661 }
3662
93531c67
DA		 3663 if (cfg->fc_flags & RTF_ADDRCONF)
3664 rt->dst_nocount = true;
1da177e4 3665
1716a961 3666 if (cfg->fc_flags & RTF_EXPIRES)
14895687 3667 fib6_set_expires(rt, jiffies +
1716a961
G		 3668 clock_t_to_jiffies(cfg->fc_expires));
3669 else
14895687 3670 fib6_clean_expires(rt);
1da177e4 3671
86872cb5
TG		 3672 if (cfg->fc_protocol == RTPROT_UNSPEC)
3673 cfg->fc_protocol = RTPROT_BOOT;
93c2fb25 3674 rt->fib6_protocol = cfg->fc_protocol;
86872cb5 3675
83c44251
DA		 3676 rt->fib6_table = table;
3677 rt->fib6_metric = cfg->fc_metric;
c7036d97 3678 rt->fib6_type = cfg->fc_type ? : RTN_UNICAST;
2b2450ca 3679 rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY;
19e42e45 3680
93c2fb25
DA		 3681 ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
3682 rt->fib6_dst.plen = cfg->fc_dst_len;
e5fd387a 3683
1da177e4 3684#ifdef CONFIG_IPV6_SUBTREES
93c2fb25
DA		 3685 ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len);
3686 rt->fib6_src.plen = cfg->fc_src_len;
1da177e4 3687#endif
f88d8ea6
DA		 3688 if (nh) {
3689 if (!nexthop_get(nh)) {
3690 NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
3691 goto out;
3692 }
3693 if (rt->fib6_src.plen) {
4daa95af 3694 NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing");
f88d8ea6
DA		 3695 goto out;
3696 }
3697 rt->nh = nh;
3698 fib6_nh = nexthop_fib6_nh(rt->nh);
3699 } else {
3700 err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack);
3701 if (err)
3702 goto out;
1da177e4 3703
f88d8ea6
DA		 3704 fib6_nh = rt->fib6_nh;
3705
3706 /* We cannot add true routes via loopback here, they would
3707 * result in kernel looping; promote them to reject routes
3708 */
3709 addr_type = ipv6_addr_type(&cfg->fc_dst);
3710 if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev,
3711 addr_type))
3712 rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP;
3713 }
955ec4cb 3714
c3968a85 3715 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
f88d8ea6 3716 struct net_device *dev = fib6_nh->fib_nh_dev;
83c44251 3717
c3968a85 3718 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
d5d531cb 3719 NL_SET_ERR_MSG(extack, "Invalid source address");
c3968a85
DW		 3720 err = -EINVAL;
3721 goto out;
3722 }
93c2fb25
DA		 3723 rt->fib6_prefsrc.addr = cfg->fc_prefsrc;
3724 rt->fib6_prefsrc.plen = 128;
c3968a85 3725 } else
93c2fb25 3726 rt->fib6_prefsrc.plen = 0;
c3968a85 3727
8c5b83f0 3728 return rt;
6b9ea5a6 3729out:
93531c67 3730 fib6_info_release(rt);
8c5b83f0 3731 return ERR_PTR(err);
6b9ea5a6
RP		 3732}
3733
acb54e3c 3734int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
333c4301 3735 struct netlink_ext_ack *extack)
6b9ea5a6 3736{
8d1c802b 3737 struct fib6_info *rt;
6b9ea5a6
RP		 3738 int err;
3739
acb54e3c 3740 rt = ip6_route_info_create(cfg, gfp_flags, extack);
d4ead6b3
DA		 3741 if (IS_ERR(rt))
3742 return PTR_ERR(rt);
6b9ea5a6 3743
d4ead6b3 3744 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack);
93531c67 3745 fib6_info_release(rt);
6b9ea5a6 3746
1da177e4
LT		 3747 return err;
3748}
3749
8d1c802b 3750static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
1da177e4 3751{
afb1d4b5 3752 struct net *net = info->nl_net;
c71099ac 3753 struct fib6_table *table;
afb1d4b5 3754 int err;
1da177e4 3755
421842ed 3756 if (rt == net->ipv6.fib6_null_entry) {
6825a26c
G		 3757 err = -ENOENT;
3758 goto out;
3759 }
6c813a72 3760
93c2fb25 3761 table = rt->fib6_table;
66f5d6ce 3762 spin_lock_bh(&table->tb6_lock);
86872cb5 3763 err = fib6_del(rt, info);
66f5d6ce 3764 spin_unlock_bh(&table->tb6_lock);
1da177e4 3765
6825a26c 3766out:
93531c67 3767 fib6_info_release(rt);
1da177e4
LT		 3768 return err;
3769}
3770
11dd74b3 3771int ip6_del_rt(struct net *net, struct fib6_info *rt, bool skip_notify)
e0a1ad73 3772{
11dd74b3
RP		 3773 struct nl_info info = {
3774 .nl_net = net,
3775 .skip_notify = skip_notify
3776 };
afb1d4b5 3777
528c4ceb 3778 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 3779}
3780
8d1c802b 3781static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
0ae81335
DA		 3782{
3783 struct nl_info *info = &cfg->fc_nlinfo;
e3330039 3784 struct net *net = info->nl_net;
16a16cd3 3785 struct sk_buff *skb = NULL;
0ae81335 3786 struct fib6_table *table;
e3330039 3787 int err = -ENOENT;
0ae81335 3788
421842ed 3789 if (rt == net->ipv6.fib6_null_entry)
e3330039 3790 goto out_put;
93c2fb25 3791 table = rt->fib6_table;
66f5d6ce 3792 spin_lock_bh(&table->tb6_lock);
0ae81335 3793
93c2fb25 3794 if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) {
8d1c802b 3795 struct fib6_info *sibling, *next_sibling;
0284696b 3796 struct fib6_node *fn;
0ae81335 3797
16a16cd3
DA		 3798 /* prefer to send a single notification with all hops */
3799 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3800 if (skb) {
3801 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3802
d4ead6b3 3803 if (rt6_fill_node(net, skb, rt, NULL,
16a16cd3
DA		 3804 NULL, NULL, 0, RTM_DELROUTE,
3805 info->portid, seq, 0) < 0) {
3806 kfree_skb(skb);
3807 skb = NULL;
3808 } else
3809 info->skip_notify = 1;
3810 }
3811
0284696b
IS		 3812 /* 'rt' points to the first sibling route. If it is not the
3813 * leaf, then we do not need to send a notification. Otherwise,
3814 * we need to check if the last sibling has a next route or not
3815 * and emit a replace or delete notification, respectively.
3816 */
2881fd61 3817 info->skip_notify_kernel = 1;
0284696b
IS		 3818 fn = rcu_dereference_protected(rt->fib6_node,
3819 lockdep_is_held(&table->tb6_lock));
3820 if (rcu_access_pointer(fn->leaf) == rt) {
3821 struct fib6_info *last_sibling, *replace_rt;
3822
3823 last_sibling = list_last_entry(&rt->fib6_siblings,
3824 struct fib6_info,
3825 fib6_siblings);
3826 replace_rt = rcu_dereference_protected(
3827 last_sibling->fib6_next,
3828 lockdep_is_held(&table->tb6_lock));
3829 if (replace_rt)
3830 call_fib6_entry_notifiers_replace(net,
3831 replace_rt);
3832 else
3833 call_fib6_multipath_entry_notifiers(net,
caafb250 3834 FIB_EVENT_ENTRY_DEL,
0284696b
IS		 3835 rt, rt->fib6_nsiblings,
3836 NULL);
3837 }
0ae81335 3838 list_for_each_entry_safe(sibling, next_sibling,
93c2fb25
DA		 3839 &rt->fib6_siblings,
3840 fib6_siblings) {
0ae81335
DA		 3841 err = fib6_del(sibling, info);
3842 if (err)
e3330039 3843 goto out_unlock;
0ae81335
DA		 3844 }
3845 }
3846
3847 err = fib6_del(rt, info);
e3330039 3848out_unlock:
66f5d6ce 3849 spin_unlock_bh(&table->tb6_lock);
e3330039 3850out_put:
93531c67 3851 fib6_info_release(rt);
16a16cd3
DA		 3852
3853 if (skb) {
e3330039 3854 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
16a16cd3
DA		 3855 info->nlh, gfp_any());
3856 }
0ae81335
DA		 3857 return err;
3858}
3859
0fa6efc5 3860static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
23fb93a4
DA		 3861{
3862 int rc = -ESRCH;
3863
3864 if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex)
3865 goto out;
3866
3867 if (cfg->fc_flags & RTF_GATEWAY &&
3868 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
3869 goto out;
761f6026
XL		 3870
3871 rc = rt6_remove_exception_rt(rt);
23fb93a4
DA		 3872out:
3873 return rc;
3874}
3875
0fa6efc5
DA		 3876static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt,
3877 struct fib6_nh *nh)
3878{
3879 struct fib6_result res = {
3880 .f6i = rt,
3881 .nh = nh,
3882 };
3883 struct rt6_info *rt_cache;
3884
3885 rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src);
3886 if (rt_cache)
3887 return __ip6_del_cached_rt(rt_cache, cfg);
3888
3889 return 0;
3890}
3891
5b98324e
DA		 3892struct fib6_nh_del_cached_rt_arg {
3893 struct fib6_config *cfg;
3894 struct fib6_info *f6i;
3895};
3896
3897static int fib6_nh_del_cached_rt(struct fib6_nh *nh, void *_arg)
3898{
3899 struct fib6_nh_del_cached_rt_arg *arg = _arg;
3900 int rc;
3901
3902 rc = ip6_del_cached_rt(arg->cfg, arg->f6i, nh);
3903 return rc != -ESRCH ? rc : 0;
3904}
3905
3906static int ip6_del_cached_rt_nh(struct fib6_config *cfg, struct fib6_info *f6i)
3907{
3908 struct fib6_nh_del_cached_rt_arg arg = {
3909 .cfg = cfg,
3910 .f6i = f6i
3911 };
3912
3913 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_del_cached_rt, &arg);
3914}
3915
333c4301
DA		 3916static int ip6_route_del(struct fib6_config *cfg,
3917 struct netlink_ext_ack *extack)
1da177e4 3918{
c71099ac 3919 struct fib6_table *table;
8d1c802b 3920 struct fib6_info *rt;
1da177e4 3921 struct fib6_node *fn;
1da177e4
LT		 3922 int err = -ESRCH;
3923
5578689a 3924 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
d5d531cb
DA		 3925 if (!table) {
3926 NL_SET_ERR_MSG(extack, "FIB table does not exist");
c71099ac 3927 return err;
d5d531cb 3928 }
c71099ac 3929
66f5d6ce 3930 rcu_read_lock();
1da177e4 3931
c71099ac 3932 fn = fib6_locate(&table->tb6_root,
86872cb5 3933 &cfg->fc_dst, cfg->fc_dst_len,
38fbeeee 3934 &cfg->fc_src, cfg->fc_src_len,
2b760fcf 3935 !(cfg->fc_flags & RTF_CACHE));
1ab1457c 3936
1da177e4 3937 if (fn) {
66f5d6ce 3938 for_each_fib6_node_rt_rcu(fn) {
ad1601ae
DA		 3939 struct fib6_nh *nh;
3940
3401bfb1
SB		 3941 if (rt->nh && cfg->fc_nh_id &&
3942 rt->nh->id != cfg->fc_nh_id)
5b98324e 3943 continue;
23fb93a4 3944
5b98324e
DA		 3945 if (cfg->fc_flags & RTF_CACHE) {
3946 int rc = 0;
3947
3948 if (rt->nh) {
3949 rc = ip6_del_cached_rt_nh(cfg, rt);
3950 } else if (cfg->fc_nh_id) {
3951 continue;
3952 } else {
3953 nh = rt->fib6_nh;
3954 rc = ip6_del_cached_rt(cfg, rt, nh);
3955 }
0fa6efc5
DA		 3956 if (rc != -ESRCH) {
3957 rcu_read_unlock();
3958 return rc;
23fb93a4
DA		 3959 }
3960 continue;
2b760fcf 3961 }
ad1601ae 3962
5b98324e
DA		 3963 if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric)
3964 continue;
3965 if (cfg->fc_protocol &&
3966 cfg->fc_protocol != rt->fib6_protocol)
3967 continue;
3968
3969 if (rt->nh) {
3970 if (!fib6_info_hold_safe(rt))
3971 continue;
3972 rcu_read_unlock();
3973
3974 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
3975 }
3976 if (cfg->fc_nh_id)
3977 continue;
3978
3979 nh = rt->fib6_nh;
86872cb5 3980 if (cfg->fc_ifindex &&
ad1601ae
DA		 3981 (!nh->fib_nh_dev ||
3982 nh->fib_nh_dev->ifindex != cfg->fc_ifindex))
1da177e4 3983 continue;
86872cb5 3984 if (cfg->fc_flags & RTF_GATEWAY &&
ad1601ae 3985 !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6))
1da177e4 3986 continue;
e873e4b9
WW		 3987 if (!fib6_info_hold_safe(rt))
3988 continue;
66f5d6ce 3989 rcu_read_unlock();
1da177e4 3990
0ae81335
DA		 3991 /* if gateway was specified only delete the one hop */
3992 if (cfg->fc_flags & RTF_GATEWAY)
3993 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
3994
3995 return __ip6_del_rt_siblings(rt, cfg);
1da177e4
LT		 3996 }
3997 }
66f5d6ce 3998 rcu_read_unlock();
1da177e4
LT		 3999
4000 return err;
4001}
4002
6700c270 4003static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
a6279458 4004{
a6279458 4005 struct netevent_redirect netevent;
e8599ff4 4006 struct rt6_info *rt, *nrt = NULL;
85bd05de 4007 struct fib6_result res = {};
e8599ff4
DM		 4008 struct ndisc_options ndopts;
4009 struct inet6_dev *in6_dev;
4010 struct neighbour *neigh;
71bcdba0 4011 struct rd_msg *msg;
6e157b6a
DM		 4012 int optlen, on_link;
4013 u8 *lladdr;
e8599ff4 4014
29a3cad5 4015 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
71bcdba0 4016 optlen -= sizeof(*msg);
e8599ff4
DM		 4017
4018 if (optlen < 0) {
6e157b6a 4019 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
e8599ff4
DM		 4020 return;
4021 }
4022
71bcdba0 4023 msg = (struct rd_msg *)icmp6_hdr(skb);
e8599ff4 4024
71bcdba0 4025 if (ipv6_addr_is_multicast(&msg->dest)) {
6e157b6a 4026 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
e8599ff4
DM		 4027 return;
4028 }
4029
6e157b6a 4030 on_link = 0;
71bcdba0 4031 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
e8599ff4 4032 on_link = 1;
71bcdba0 4033 } else if (ipv6_addr_type(&msg->target) !=
e8599ff4 4034 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
6e157b6a 4035 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
e8599ff4
DM		 4036 return;
4037 }
4038
4039 in6_dev = __in6_dev_get(skb->dev);
4040 if (!in6_dev)
4041 return;
4042 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
4043 return;
4044
4045 /* RFC2461 8.1:
4046 * The IP source address of the Redirect MUST be the same as the current
4047 * first-hop router for the specified ICMP Destination Address.
4048 */
4049
f997c55c 4050 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
e8599ff4
DM		 4051 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
4052 return;
4053 }
6e157b6a
DM		 4054
4055 lladdr = NULL;
e8599ff4
DM		 4056 if (ndopts.nd_opts_tgt_lladdr) {
4057 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
4058 skb->dev);
4059 if (!lladdr) {
4060 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
4061 return;
4062 }
4063 }
4064
6e157b6a 4065 rt = (struct rt6_info *) dst;
ec13ad1d 4066 if (rt->rt6i_flags & RTF_REJECT) {
6e157b6a 4067 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
e8599ff4 4068 return;
6e157b6a 4069 }
e8599ff4 4070
6e157b6a
DM		 4071 /* Redirect received -> path was valid.
4072 * Look, redirects are sent only in response to data packets,
4073 * so that this nexthop apparently is reachable. --ANK
4074 */
0dec879f 4075 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
a6279458 4076
71bcdba0 4077 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
6e157b6a
DM		 4078 if (!neigh)
4079 return;
a6279458 4080
1da177e4
LT		 4081 /*
4082 * We have finally decided to accept it.
4083 */
4084
f997c55c 4085 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
1da177e4
LT		 4086 NEIGH_UPDATE_F_WEAK_OVERRIDE|
4087 NEIGH_UPDATE_F_OVERRIDE|
4088 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
f997c55c
AA		 4089 NEIGH_UPDATE_F_ISROUTER)),
4090 NDISC_REDIRECT, &ndopts);
1da177e4 4091
4d85cd0c 4092 rcu_read_lock();
85bd05de 4093 res.f6i = rcu_dereference(rt->from);
ff24e498 4094 if (!res.f6i)
886b7a50 4095 goto out;
8a14e46f 4096
49d5b8ef
DA		 4097 if (res.f6i->nh) {
4098 struct fib6_nh_match_arg arg = {
4099 .dev = dst->dev,
4100 .gw = &rt->rt6i_gateway,
4101 };
4102
4103 nexthop_for_each_fib6_nh(res.f6i->nh,
4104 fib6_nh_find_match, &arg);
4105
4106 /* fib6_info uses a nexthop that does not have fib6_nh
4107 * using the dst->dev. Should be impossible
4108 */
4109 if (!arg.match)
4110 goto out;
4111 res.nh = arg.match;
4112 } else {
4113 res.nh = res.f6i->fib6_nh;
4114 }
4115
7d21fec9
DA		 4116 res.fib6_flags = res.f6i->fib6_flags;
4117 res.fib6_type = res.f6i->fib6_type;
85bd05de 4118 nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL);
38308473 4119 if (!nrt)
1da177e4
LT		 4120 goto out;
4121
4122 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
4123 if (on_link)
4124 nrt->rt6i_flags &= ~RTF_GATEWAY;
4125
4e3fd7a0 4126 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1da177e4 4127
886b7a50 4128 /* rt6_insert_exception() will take care of duplicated exceptions */
5012f0a5 4129 if (rt6_insert_exception(nrt, &res)) {
2b760fcf
WW		 4130 dst_release_immediate(&nrt->dst);
4131 goto out;
4132 }
1da177e4 4133
d8d1f30b
CG		 4134 netevent.old = &rt->dst;
4135 netevent.new = &nrt->dst;
71bcdba0 4136 netevent.daddr = &msg->dest;
60592833 4137 netevent.neigh = neigh;
8d71740c
TT		 4138 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
4139
1da177e4 4140out:
886b7a50 4141 rcu_read_unlock();
e8599ff4 4142 neigh_release(neigh);
6e157b6a
DM		 4143}
4144
70ceb4f5 4145#ifdef CONFIG_IPV6_ROUTE_INFO
8d1c802b 4146static struct fib6_info *rt6_get_route_info(struct net *net,
b71d1d42 4147 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 4148 const struct in6_addr *gwaddr,
4149 struct net_device *dev)
70ceb4f5 4150{
830218c1
DA		 4151 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
4152 int ifindex = dev->ifindex;
70ceb4f5 4153 struct fib6_node *fn;
8d1c802b 4154 struct fib6_info *rt = NULL;
c71099ac
TG		 4155 struct fib6_table *table;
4156
830218c1 4157 table = fib6_get_table(net, tb_id);
38308473 4158 if (!table)
c71099ac 4159 return NULL;
70ceb4f5 4160
66f5d6ce 4161 rcu_read_lock();
38fbeeee 4162 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true);
70ceb4f5
YH		 4163 if (!fn)
4164 goto out;
4165
66f5d6ce 4166 for_each_fib6_node_rt_rcu(fn) {
f88d8ea6
DA		 4167 /* these routes do not use nexthops */
4168 if (rt->nh)
4169 continue;
1cf844c7 4170 if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex)
70ceb4f5 4171 continue;
2b2450ca 4172 if (!(rt->fib6_flags & RTF_ROUTEINFO) ||
1cf844c7 4173 !rt->fib6_nh->fib_nh_gw_family)
70ceb4f5 4174 continue;
1cf844c7 4175 if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr))
70ceb4f5 4176 continue;
e873e4b9
WW		 4177 if (!fib6_info_hold_safe(rt))
4178 continue;
70ceb4f5
YH		 4179 break;
4180 }
4181out:
66f5d6ce 4182 rcu_read_unlock();
70ceb4f5
YH		 4183 return rt;
4184}
4185
8d1c802b 4186static struct fib6_info *rt6_add_route_info(struct net *net,
b71d1d42 4187 const struct in6_addr *prefix, int prefixlen,
830218c1
DA		 4188 const struct in6_addr *gwaddr,
4189 struct net_device *dev,
95c96174 4190 unsigned int pref)
70ceb4f5 4191{
86872cb5 4192 struct fib6_config cfg = {
238fc7ea 4193 .fc_metric = IP6_RT_PRIO_USER,
830218c1 4194 .fc_ifindex = dev->ifindex,
86872cb5
TG		 4195 .fc_dst_len = prefixlen,
4196 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
4197 RTF_UP | RTF_PREF(pref),
b91d5329 4198 .fc_protocol = RTPROT_RA,
e8478e80 4199 .fc_type = RTN_UNICAST,
15e47304 4200 .fc_nlinfo.portid = 0,
efa2cea0
DL		 4201 .fc_nlinfo.nlh = NULL,
4202 .fc_nlinfo.nl_net = net,
86872cb5
TG		 4203 };
4204
830218c1 4205 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
4e3fd7a0
AD		 4206 cfg.fc_dst = *prefix;
4207 cfg.fc_gateway = *gwaddr;
70ceb4f5 4208
e317da96
YH		 4209 /* We should treat it as a default route if prefix length is 0. */
4210 if (!prefixlen)
86872cb5 4211 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 4212
acb54e3c 4213 ip6_route_add(&cfg, GFP_ATOMIC, NULL);
70ceb4f5 4214
830218c1 4215 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
70ceb4f5
YH		 4216}
4217#endif
4218
8d1c802b 4219struct fib6_info *rt6_get_dflt_router(struct net *net,
afb1d4b5
DA		 4220 const struct in6_addr *addr,
4221 struct net_device *dev)
1ab1457c 4222{
830218c1 4223 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
8d1c802b 4224 struct fib6_info *rt;
c71099ac 4225 struct fib6_table *table;
1da177e4 4226
afb1d4b5 4227 table = fib6_get_table(net, tb_id);
38308473 4228 if (!table)
c71099ac 4229 return NULL;
1da177e4 4230
66f5d6ce
WW		 4231 rcu_read_lock();
4232 for_each_fib6_node_rt_rcu(&table->tb6_root) {
f88d8ea6 4233 struct fib6_nh *nh;
ad1601ae 4234
f88d8ea6
DA		 4235 /* RA routes do not use nexthops */
4236 if (rt->nh)
4237 continue;
4238
4239 nh = rt->fib6_nh;
ad1601ae 4240 if (dev == nh->fib_nh_dev &&
93c2fb25 4241 ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
ad1601ae 4242 ipv6_addr_equal(&nh->fib_nh_gw6, addr))
1da177e4
LT		 4243 break;
4244 }
e873e4b9
WW		 4245 if (rt && !fib6_info_hold_safe(rt))
4246 rt = NULL;
66f5d6ce 4247 rcu_read_unlock();
1da177e4
LT		 4248 return rt;
4249}
4250
8d1c802b 4251struct fib6_info *rt6_add_dflt_router(struct net *net,
afb1d4b5 4252 const struct in6_addr *gwaddr,
ebacaaa0
YH		 4253 struct net_device *dev,
4254 unsigned int pref)
1da177e4 4255{
86872cb5 4256 struct fib6_config cfg = {
ca254490 4257 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
238fc7ea 4258 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 4259 .fc_ifindex = dev->ifindex,
4260 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
4261 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
b91d5329 4262 .fc_protocol = RTPROT_RA,
e8478e80 4263 .fc_type = RTN_UNICAST,
15e47304 4264 .fc_nlinfo.portid = 0,
5578689a 4265 .fc_nlinfo.nlh = NULL,
afb1d4b5 4266 .fc_nlinfo.nl_net = net,
86872cb5 4267 };
1da177e4 4268
4e3fd7a0 4269 cfg.fc_gateway = *gwaddr;
1da177e4 4270
acb54e3c 4271 if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) {
830218c1
DA		 4272 struct fib6_table *table;
4273
4274 table = fib6_get_table(dev_net(dev), cfg.fc_table);
4275 if (table)
4276 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
4277 }
1da177e4 4278
afb1d4b5 4279 return rt6_get_dflt_router(net, gwaddr, dev);
1da177e4
LT		 4280}
4281
afb1d4b5
DA		 4282static void __rt6_purge_dflt_routers(struct net *net,
4283 struct fib6_table *table)
1da177e4 4284{
8d1c802b 4285 struct fib6_info *rt;
1da177e4
LT		 4286
4287restart:
66f5d6ce
WW		 4288 rcu_read_lock();
4289 for_each_fib6_node_rt_rcu(&table->tb6_root) {
dcd1f572
DA		 4290 struct net_device *dev = fib6_info_nh_dev(rt);
4291 struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL;
4292
93c2fb25 4293 if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
e873e4b9
WW		 4294 (!idev || idev->cnf.accept_ra != 2) &&
4295 fib6_info_hold_safe(rt)) {
93531c67 4296 rcu_read_unlock();
11dd74b3 4297 ip6_del_rt(net, rt, false);
1da177e4
LT		 4298 goto restart;
4299 }
4300 }
66f5d6ce 4301 rcu_read_unlock();
830218c1
DA		 4302
4303 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
4304}
4305
4306void rt6_purge_dflt_routers(struct net *net)
4307{
4308 struct fib6_table *table;
4309 struct hlist_head *head;
4310 unsigned int h;
4311
4312 rcu_read_lock();
4313
4314 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
4315 head = &net->ipv6.fib_table_hash[h];
4316 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
4317 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
afb1d4b5 4318 __rt6_purge_dflt_routers(net, table);
830218c1
DA		 4319 }
4320 }
4321
4322 rcu_read_unlock();
1da177e4
LT		 4323}
4324
5578689a
DL		 4325static void rtmsg_to_fib6_config(struct net *net,
4326 struct in6_rtmsg *rtmsg,
86872cb5
TG		 4327 struct fib6_config *cfg)
4328{
8823a3ac
MŻ		 4329 *cfg = (struct fib6_config){
4330 .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
4331 : RT6_TABLE_MAIN,
4332 .fc_ifindex = rtmsg->rtmsg_ifindex,
67f69513 4333 .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER,
8823a3ac
MŻ		 4334 .fc_expires = rtmsg->rtmsg_info,
4335 .fc_dst_len = rtmsg->rtmsg_dst_len,
4336 .fc_src_len = rtmsg->rtmsg_src_len,
4337 .fc_flags = rtmsg->rtmsg_flags,
4338 .fc_type = rtmsg->rtmsg_type,
4339
4340 .fc_nlinfo.nl_net = net,
4341
4342 .fc_dst = rtmsg->rtmsg_dst,
4343 .fc_src = rtmsg->rtmsg_src,
4344 .fc_gateway = rtmsg->rtmsg_gateway,
4345 };
86872cb5
TG		 4346}
4347
7c1552da 4348int ipv6_route_ioctl(struct net *net, unsigned int cmd, struct in6_rtmsg *rtmsg)
1da177e4 4349{
86872cb5 4350 struct fib6_config cfg;
1da177e4
LT		 4351 int err;
4352
7c1552da
CH		 4353 if (cmd != SIOCADDRT && cmd != SIOCDELRT)
4354 return -EINVAL;
4355 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4356 return -EPERM;
86872cb5 4357
7c1552da 4358 rtmsg_to_fib6_config(net, rtmsg, &cfg);
1da177e4 4359
7c1552da
CH		 4360 rtnl_lock();
4361 switch (cmd) {
4362 case SIOCADDRT:
4363 err = ip6_route_add(&cfg, GFP_KERNEL, NULL);
4364 break;
4365 case SIOCDELRT:
4366 err = ip6_route_del(&cfg, NULL);
4367 break;
3ff50b79 4368 }
7c1552da
CH		 4369 rtnl_unlock();
4370 return err;
1da177e4
LT		 4371}
4372
4373/*
4374 * Drop the packet on the floor
4375 */
4376
d5fdd6ba 4377static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
1da177e4 4378{
adf30907 4379 struct dst_entry *dst = skb_dst(skb);
1d3fd8a1
SS		 4380 struct net *net = dev_net(dst->dev);
4381 struct inet6_dev *idev;
4382 int type;
4383
4384 if (netif_is_l3_master(skb->dev) &&
4385 dst->dev == net->loopback_dev)
4386 idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif));
4387 else
4388 idev = ip6_dst_idev(dst);
4389
612f09e8
YH		 4390 switch (ipstats_mib_noroutes) {
4391 case IPSTATS_MIB_INNOROUTES:
0660e03f 4392 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
45bb0060 4393 if (type == IPV6_ADDR_ANY) {
1d3fd8a1 4394 IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
612f09e8
YH		 4395 break;
4396 }
a8eceea8 4397 fallthrough;
612f09e8 4398 case IPSTATS_MIB_OUTNOROUTES:
1d3fd8a1 4399 IP6_INC_STATS(net, idev, ipstats_mib_noroutes);
612f09e8
YH		 4400 break;
4401 }
1d3fd8a1
SS		 4402
4403 /* Start over by dropping the dst for l3mdev case */
4404 if (netif_is_l3_master(skb->dev))
4405 skb_dst_drop(skb);
4406
3ffe533c 4407 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
1da177e4
LT		 4408 kfree_skb(skb);
4409 return 0;
4410}
4411
9ce8ade0
TG		 4412static int ip6_pkt_discard(struct sk_buff *skb)
4413{
612f09e8 4414 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 4415}
4416
ede2059d 4417static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
1da177e4 4418{
adf30907 4419 skb->dev = skb_dst(skb)->dev;
612f09e8 4420 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 4421}
4422
9ce8ade0
TG		 4423static int ip6_pkt_prohibit(struct sk_buff *skb)
4424{
612f09e8 4425 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 4426}
4427
ede2059d 4428static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
9ce8ade0 4429{
adf30907 4430 skb->dev = skb_dst(skb)->dev;
612f09e8 4431 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 4432}
4433
1da177e4
LT		 4434/*
4435 * Allocate a dst for local (unicast / anycast) address.
4436 */
4437
360a9887
DA		 4438struct fib6_info *addrconf_f6i_alloc(struct net *net,
4439 struct inet6_dev *idev,
4440 const struct in6_addr *addr,
4441 bool anycast, gfp_t gfp_flags)
1da177e4 4442{
c7a1ce39
DA		 4443 struct fib6_config cfg = {
4444 .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL,
4445 .fc_ifindex = idev->dev->ifindex,
d55a2e37 4446 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c7a1ce39
DA		 4447 .fc_dst = *addr,
4448 .fc_dst_len = 128,
4449 .fc_protocol = RTPROT_KERNEL,
4450 .fc_nlinfo.nl_net = net,
4451 .fc_ignore_dev_down = true,
4452 };
d55a2e37 4453 struct fib6_info *f6i;
1da177e4 4454
e8478e80 4455 if (anycast) {
c7a1ce39
DA		 4456 cfg.fc_type = RTN_ANYCAST;
4457 cfg.fc_flags |= RTF_ANYCAST;
e8478e80 4458 } else {
c7a1ce39
DA		 4459 cfg.fc_type = RTN_LOCAL;
4460 cfg.fc_flags |= RTF_LOCAL;
e8478e80 4461 }
1da177e4 4462
d55a2e37 4463 f6i = ip6_route_info_create(&cfg, gfp_flags, NULL);
8652f17c 4464 if (!IS_ERR(f6i))
d55a2e37
MŻ		 4465 f6i->dst_nocount = true;
4466 return f6i;
1da177e4
LT		 4467}
4468
c3968a85
DW		 4469/* remove deleted ip from prefsrc entries */
4470struct arg_dev_net_ip {
4471 struct net_device *dev;
4472 struct net *net;
4473 struct in6_addr *addr;
4474};
4475
8d1c802b 4476static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg)
c3968a85
DW		 4477{
4478 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
4479 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
4480 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
4481
f88d8ea6
DA		 4482 if (!rt->nh &&
4483 ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) &&
421842ed 4484 rt != net->ipv6.fib6_null_entry &&
93c2fb25 4485 ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) {
60006a48 4486 spin_lock_bh(&rt6_exception_lock);
c3968a85 4487 /* remove prefsrc entry */
93c2fb25 4488 rt->fib6_prefsrc.plen = 0;
60006a48 4489 spin_unlock_bh(&rt6_exception_lock);
c3968a85
DW		 4490 }
4491 return 0;
4492}
4493
4494void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
4495{
4496 struct net *net = dev_net(ifp->idev->dev);
4497 struct arg_dev_net_ip adni = {
4498 .dev = ifp->idev->dev,
4499 .net = net,
4500 .addr = &ifp->addr,
4501 };
0c3584d5 4502 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
c3968a85
DW		 4503}
4504
2b2450ca 4505#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT)
be7a010d
DJ		 4506
4507/* Remove routers and update dst entries when gateway turn into host. */
8d1c802b 4508static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
be7a010d
DJ		 4509{
4510 struct in6_addr *gateway = (struct in6_addr *)arg;
f88d8ea6
DA		 4511 struct fib6_nh *nh;
4512
4513 /* RA routes do not use nexthops */
4514 if (rt->nh)
4515 return 0;
be7a010d 4516
f88d8ea6 4517 nh = rt->fib6_nh;
93c2fb25 4518 if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
cc5c073a 4519 nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6))
be7a010d 4520 return -1;
b16cb459
WW		 4521
4522 /* Further clean up cached routes in exception table.
4523 * This is needed because cached route may have a different
4524 * gateway than its 'parent' in the case of an ip redirect.
4525 */
cc5c073a 4526 fib6_nh_exceptions_clean_tohost(nh, gateway);
b16cb459 4527
be7a010d
DJ		 4528 return 0;
4529}
4530
4531void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
4532{
4533 fib6_clean_all(net, fib6_clean_tohost, gateway);
4534}
4535
2127d95a
IS		 4536struct arg_netdev_event {
4537 const struct net_device *dev;
4c981e28 4538 union {
ecc5663c 4539 unsigned char nh_flags;
4c981e28
IS		 4540 unsigned long event;
4541 };
2127d95a
IS		 4542};
4543
8d1c802b 4544static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt)
d7dedee1 4545{
8d1c802b 4546 struct fib6_info *iter;
d7dedee1
IS		 4547 struct fib6_node *fn;
4548
93c2fb25
DA		 4549 fn = rcu_dereference_protected(rt->fib6_node,
4550 lockdep_is_held(&rt->fib6_table->tb6_lock));
d7dedee1 4551 iter = rcu_dereference_protected(fn->leaf,
93c2fb25 4552 lockdep_is_held(&rt->fib6_table->tb6_lock));
d7dedee1 4553 while (iter) {
93c2fb25 4554 if (iter->fib6_metric == rt->fib6_metric &&
33bd5ac5 4555 rt6_qualify_for_ecmp(iter))
d7dedee1 4556 return iter;
8fb11a9a 4557 iter = rcu_dereference_protected(iter->fib6_next,
93c2fb25 4558 lockdep_is_held(&rt->fib6_table->tb6_lock));
d7dedee1
IS		 4559 }
4560
4561 return NULL;
4562}
4563
f88d8ea6 4564/* only called for fib entries with builtin fib6_nh */
8d1c802b 4565static bool rt6_is_dead(const struct fib6_info *rt)
d7dedee1 4566{
1cf844c7
DA		 4567 if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD ||
4568 (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN &&
4569 ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev)))
d7dedee1
IS		 4570 return true;
4571
4572 return false;
4573}
4574
8d1c802b 4575static int rt6_multipath_total_weight(const struct fib6_info *rt)
d7dedee1 4576{
8d1c802b 4577 struct fib6_info *iter;
d7dedee1
IS		 4578 int total = 0;
4579
4580 if (!rt6_is_dead(rt))
1cf844c7 4581 total += rt->fib6_nh->fib_nh_weight;
d7dedee1 4582
93c2fb25 4583 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
d7dedee1 4584 if (!rt6_is_dead(iter))
1cf844c7 4585 total += iter->fib6_nh->fib_nh_weight;
d7dedee1
IS		 4586 }
4587
4588 return total;
4589}
4590
8d1c802b 4591static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total)
d7dedee1
IS		 4592{
4593 int upper_bound = -1;
4594
4595 if (!rt6_is_dead(rt)) {
1cf844c7 4596 *weight += rt->fib6_nh->fib_nh_weight;
d7dedee1
IS		 4597 upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
4598 total) - 1;
4599 }
1cf844c7 4600 atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound);
d7dedee1
IS		 4601}
4602
8d1c802b 4603static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total)
d7dedee1 4604{
8d1c802b 4605 struct fib6_info *iter;
d7dedee1
IS		 4606 int weight = 0;
4607
4608 rt6_upper_bound_set(rt, &weight, total);
4609
93c2fb25 4610 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
d7dedee1
IS		 4611 rt6_upper_bound_set(iter, &weight, total);
4612}
4613
8d1c802b 4614void rt6_multipath_rebalance(struct fib6_info *rt)
d7dedee1 4615{
8d1c802b 4616 struct fib6_info *first;
d7dedee1
IS		 4617 int total;
4618
4619 /* In case the entire multipath route was marked for flushing,
4620 * then there is no need to rebalance upon the removal of every
4621 * sibling route.
4622 */
93c2fb25 4623 if (!rt->fib6_nsiblings || rt->should_flush)
d7dedee1
IS		 4624 return;
4625
4626 /* During lookup routes are evaluated in order, so we need to
4627 * make sure upper bounds are assigned from the first sibling
4628 * onwards.
4629 */
4630 first = rt6_multipath_first_sibling(rt);
4631 if (WARN_ON_ONCE(!first))
4632 return;
4633
4634 total = rt6_multipath_total_weight(first);
4635 rt6_multipath_upper_bound_set(first, total);
4636}
4637
8d1c802b 4638static int fib6_ifup(struct fib6_info *rt, void *p_arg)
2127d95a
IS		 4639{
4640 const struct arg_netdev_event *arg = p_arg;
7aef6859 4641 struct net *net = dev_net(arg->dev);
2127d95a 4642
f88d8ea6 4643 if (rt != net->ipv6.fib6_null_entry && !rt->nh &&
1cf844c7
DA		 4644 rt->fib6_nh->fib_nh_dev == arg->dev) {
4645 rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags;
7aef6859 4646 fib6_update_sernum_upto_root(net, rt);
d7dedee1 4647 rt6_multipath_rebalance(rt);
1de178ed 4648 }
2127d95a
IS		 4649
4650 return 0;
4651}
4652
ecc5663c 4653void rt6_sync_up(struct net_device *dev, unsigned char nh_flags)
2127d95a
IS		 4654{
4655 struct arg_netdev_event arg = {
4656 .dev = dev,
6802f3ad
IS		 4657 {
4658 .nh_flags = nh_flags,
4659 },
2127d95a
IS		 4660 };
4661
4662 if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev))
4663 arg.nh_flags |= RTNH_F_LINKDOWN;
4664
4665 fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
4666}
4667
f88d8ea6 4668/* only called for fib entries with inline fib6_nh */
8d1c802b 4669static bool rt6_multipath_uses_dev(const struct fib6_info *rt,
1de178ed
IS		 4670 const struct net_device *dev)
4671{
8d1c802b 4672 struct fib6_info *iter;
1de178ed 4673
1cf844c7 4674 if (rt->fib6_nh->fib_nh_dev == dev)
1de178ed 4675 return true;
93c2fb25 4676 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
1cf844c7 4677 if (iter->fib6_nh->fib_nh_dev == dev)
1de178ed
IS		 4678 return true;
4679
4680 return false;
4681}
4682
8d1c802b 4683static void rt6_multipath_flush(struct fib6_info *rt)
1de178ed 4684{
8d1c802b 4685 struct fib6_info *iter;
1de178ed
IS		 4686
4687 rt->should_flush = 1;
93c2fb25 4688 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
1de178ed
IS		 4689 iter->should_flush = 1;
4690}
4691
8d1c802b 4692static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
1de178ed
IS		 4693 const struct net_device *down_dev)
4694{
8d1c802b 4695 struct fib6_info *iter;
1de178ed
IS		 4696 unsigned int dead = 0;
4697
1cf844c7
DA		 4698 if (rt->fib6_nh->fib_nh_dev == down_dev ||
4699 rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
1de178ed 4700 dead++;
93c2fb25 4701 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
1cf844c7
DA		 4702 if (iter->fib6_nh->fib_nh_dev == down_dev ||
4703 iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
1de178ed
IS		 4704 dead++;
4705
4706 return dead;
4707}
4708
8d1c802b 4709static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
1de178ed 4710 const struct net_device *dev,
ecc5663c 4711 unsigned char nh_flags)
1de178ed 4712{
8d1c802b 4713 struct fib6_info *iter;
1de178ed 4714
1cf844c7
DA		 4715 if (rt->fib6_nh->fib_nh_dev == dev)
4716 rt->fib6_nh->fib_nh_flags |= nh_flags;
93c2fb25 4717 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
1cf844c7
DA		 4718 if (iter->fib6_nh->fib_nh_dev == dev)
4719 iter->fib6_nh->fib_nh_flags |= nh_flags;
1de178ed
IS		 4720}
4721
a1a22c12 4722/* called with write lock held for table with rt */
8d1c802b 4723static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
1da177e4 4724{
4c981e28
IS		 4725 const struct arg_netdev_event *arg = p_arg;
4726 const struct net_device *dev = arg->dev;
7aef6859 4727 struct net *net = dev_net(dev);
8ed67789 4728
f88d8ea6 4729 if (rt == net->ipv6.fib6_null_entry || rt->nh)
27c6fa73
IS		 4730 return 0;
4731
4732 switch (arg->event) {
4733 case NETDEV_UNREGISTER:
1cf844c7 4734 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
27c6fa73 4735 case NETDEV_DOWN:
1de178ed 4736 if (rt->should_flush)
27c6fa73 4737 return -1;
93c2fb25 4738 if (!rt->fib6_nsiblings)
1cf844c7 4739 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
1de178ed
IS		 4740 if (rt6_multipath_uses_dev(rt, dev)) {
4741 unsigned int count;
4742
4743 count = rt6_multipath_dead_count(rt, dev);
93c2fb25 4744 if (rt->fib6_nsiblings + 1 == count) {
1de178ed
IS		 4745 rt6_multipath_flush(rt);
4746 return -1;
4747 }
4748 rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD |
4749 RTNH_F_LINKDOWN);
7aef6859 4750 fib6_update_sernum(net, rt);
d7dedee1 4751 rt6_multipath_rebalance(rt);
1de178ed
IS		 4752 }
4753 return -2;
27c6fa73 4754 case NETDEV_CHANGE:
1cf844c7 4755 if (rt->fib6_nh->fib_nh_dev != dev ||
93c2fb25 4756 rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST))
27c6fa73 4757 break;
1cf844c7 4758 rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
d7dedee1 4759 rt6_multipath_rebalance(rt);
27c6fa73 4760 break;
2b241361 4761 }
c159d30c 4762
1da177e4
LT		 4763 return 0;
4764}
4765
27c6fa73 4766void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
1da177e4 4767{
4c981e28 4768 struct arg_netdev_event arg = {
8ed67789 4769 .dev = dev,
6802f3ad
IS		 4770 {
4771 .event = event,
4772 },
8ed67789 4773 };
7c6bb7d2 4774 struct net *net = dev_net(dev);
8ed67789 4775
7c6bb7d2
DA		 4776 if (net->ipv6.sysctl.skip_notify_on_dev_down)
4777 fib6_clean_all_skip_notify(net, fib6_ifdown, &arg);
4778 else
4779 fib6_clean_all(net, fib6_ifdown, &arg);
4c981e28
IS		 4780}
4781
4782void rt6_disable_ip(struct net_device *dev, unsigned long event)
4783{
4784 rt6_sync_down_dev(dev, event);
4785 rt6_uncached_list_flush_dev(dev_net(dev), dev);
4786 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 4787}
4788
95c96174 4789struct rt6_mtu_change_arg {
1da177e4 4790 struct net_device *dev;
95c96174 4791 unsigned int mtu;
c0b220cf 4792 struct fib6_info *f6i;
1da177e4
LT		 4793};
4794
cc5c073a 4795static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg)
c0b220cf
DA		 4796{
4797 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg;
cc5c073a 4798 struct fib6_info *f6i = arg->f6i;
c0b220cf
DA		 4799
4800 /* For administrative MTU increase, there is no way to discover
4801 * IPv6 PMTU increase, so PMTU increase should be updated here.
4802 * Since RFC 1981 doesn't include administrative MTU increase
4803 * update PMTU increase is a MUST. (i.e. jumbo frame)
4804 */
4805 if (nh->fib_nh_dev == arg->dev) {
4806 struct inet6_dev *idev = __in6_dev_get(arg->dev);
4807 u32 mtu = f6i->fib6_pmtu;
4808
4809 if (mtu >= arg->mtu ||
4810 (mtu < arg->mtu && mtu == idev->cnf.mtu6))
4811 fib6_metric_set(f6i, RTAX_MTU, arg->mtu);
4812
4813 spin_lock_bh(&rt6_exception_lock);
cc5c073a 4814 rt6_exceptions_update_pmtu(idev, nh, arg->mtu);
c0b220cf
DA		 4815 spin_unlock_bh(&rt6_exception_lock);
4816 }
4817
4818 return 0;
4819}
4820
4821static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg)
1da177e4
LT		 4822{
4823 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
4824 struct inet6_dev *idev;
4825
4826 /* In IPv6 pmtu discovery is not optional,
4827 so that RTAX_MTU lock cannot disable it.
4828 We still use this lock to block changes
4829 caused by addrconf/ndisc.
4830 */
4831
4832 idev = __in6_dev_get(arg->dev);
38308473 4833 if (!idev)
1da177e4
LT		 4834 return 0;
4835
c0b220cf
DA		 4836 if (fib6_metric_locked(f6i, RTAX_MTU))
4837 return 0;
d4ead6b3 4838
c0b220cf 4839 arg->f6i = f6i;
2d44234b
DA		 4840 if (f6i->nh) {
4841 /* fib6_nh_mtu_change only returns 0, so this is safe */
4842 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_mtu_change,
4843 arg);
4844 }
4845
1cf844c7 4846 return fib6_nh_mtu_change(f6i->fib6_nh, arg);
1da177e4
LT		 4847}
4848
95c96174 4849void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
1da177e4 4850{
c71099ac
TG		 4851 struct rt6_mtu_change_arg arg = {
4852 .dev = dev,
4853 .mtu = mtu,
4854 };
1da177e4 4855
0c3584d5 4856 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
1da177e4
LT		 4857}
4858
ef7c79ed 4859static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
75425657 4860 [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 },
5176f91e 4861 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
aa8f8778 4862 [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) },
86872cb5 4863 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 4864 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 4865 [RTA_PRIORITY] = { .type = NLA_U32 },
4866 [RTA_METRICS] = { .type = NLA_NESTED },
51ebd318 4867 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
c78ba6d6 4868 [RTA_PREF] = { .type = NLA_U8 },
19e42e45
RP		 4869 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
4870 [RTA_ENCAP] = { .type = NLA_NESTED },
32bc201e 4871 [RTA_EXPIRES] = { .type = NLA_U32 },
622ec2c9 4872 [RTA_UID] = { .type = NLA_U32 },
3b45a410 4873 [RTA_MARK] = { .type = NLA_U32 },
aa8f8778 4874 [RTA_TABLE] = { .type = NLA_U32 },
eacb9384
RP		 4875 [RTA_IP_PROTO] = { .type = NLA_U8 },
4876 [RTA_SPORT] = { .type = NLA_U16 },
4877 [RTA_DPORT] = { .type = NLA_U16 },
5b98324e 4878 [RTA_NH_ID] = { .type = NLA_U32 },
86872cb5
TG		 4879};
4880
4881static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
333c4301
DA		 4882 struct fib6_config *cfg,
4883 struct netlink_ext_ack *extack)
1da177e4 4884{
86872cb5
TG		 4885 struct rtmsg *rtm;
4886 struct nlattr *tb[RTA_MAX+1];
c78ba6d6 4887 unsigned int pref;
86872cb5 4888 int err;
1da177e4 4889
8cb08174
JB		 4890 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
4891 rtm_ipv6_policy, extack);
86872cb5
TG		 4892 if (err < 0)
4893 goto errout;
1da177e4 4894
86872cb5
TG		 4895 err = -EINVAL;
4896 rtm = nlmsg_data(nlh);
86872cb5 4897
84db8407
MŻ		 4898 *cfg = (struct fib6_config){
4899 .fc_table = rtm->rtm_table,
4900 .fc_dst_len = rtm->rtm_dst_len,
4901 .fc_src_len = rtm->rtm_src_len,
4902 .fc_flags = RTF_UP,
4903 .fc_protocol = rtm->rtm_protocol,
4904 .fc_type = rtm->rtm_type,
4905
4906 .fc_nlinfo.portid = NETLINK_CB(skb).portid,
4907 .fc_nlinfo.nlh = nlh,
4908 .fc_nlinfo.nl_net = sock_net(skb->sk),
4909 };
86872cb5 4910
ef2c7d7b
ND		 4911 if (rtm->rtm_type == RTN_UNREACHABLE ||
4912 rtm->rtm_type == RTN_BLACKHOLE ||
b4949ab2
ND		 4913 rtm->rtm_type == RTN_PROHIBIT ||
4914 rtm->rtm_type == RTN_THROW)
86872cb5
TG		 4915 cfg->fc_flags |= RTF_REJECT;
4916
ab79ad14
MŻ		 4917 if (rtm->rtm_type == RTN_LOCAL)
4918 cfg->fc_flags |= RTF_LOCAL;
4919
1f56a01f
MKL		 4920 if (rtm->rtm_flags & RTM_F_CLONED)
4921 cfg->fc_flags |= RTF_CACHE;
4922
fc1e64e1
DA		 4923 cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK);
4924
5b98324e
DA		 4925 if (tb[RTA_NH_ID]) {
4926 if (tb[RTA_GATEWAY] || tb[RTA_OIF] ||
4927 tb[RTA_MULTIPATH] || tb[RTA_ENCAP]) {
4928 NL_SET_ERR_MSG(extack,
4929 "Nexthop specification and nexthop id are mutually exclusive");
4930 goto errout;
4931 }
4932 cfg->fc_nh_id = nla_get_u32(tb[RTA_NH_ID]);
4933 }
4934
86872cb5 4935 if (tb[RTA_GATEWAY]) {
67b61f6c 4936 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
86872cb5 4937 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 4938 }
e3818541
DA		 4939 if (tb[RTA_VIA]) {
4940 NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute");
4941 goto errout;
4942 }
86872cb5
TG		 4943
4944 if (tb[RTA_DST]) {
4945 int plen = (rtm->rtm_dst_len + 7) >> 3;
4946
4947 if (nla_len(tb[RTA_DST]) < plen)
4948 goto errout;
4949
4950 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 4951 }
86872cb5
TG		 4952
4953 if (tb[RTA_SRC]) {
4954 int plen = (rtm->rtm_src_len + 7) >> 3;
4955
4956 if (nla_len(tb[RTA_SRC]) < plen)
4957 goto errout;
4958
4959 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 4960 }
86872cb5 4961
c3968a85 4962 if (tb[RTA_PREFSRC])
67b61f6c 4963 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
c3968a85 4964
86872cb5
TG		 4965 if (tb[RTA_OIF])
4966 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
4967
4968 if (tb[RTA_PRIORITY])
4969 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
4970
4971 if (tb[RTA_METRICS]) {
4972 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
4973 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 4974 }
86872cb5
TG		 4975
4976 if (tb[RTA_TABLE])
4977 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
4978
51ebd318
ND		 4979 if (tb[RTA_MULTIPATH]) {
4980 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
4981 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
9ed59592
DA		 4982
4983 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
c255bd68 4984 cfg->fc_mp_len, extack);
9ed59592
DA		 4985 if (err < 0)
4986 goto errout;
51ebd318
ND		 4987 }
4988
c78ba6d6
LR		 4989 if (tb[RTA_PREF]) {
4990 pref = nla_get_u8(tb[RTA_PREF]);
4991 if (pref != ICMPV6_ROUTER_PREF_LOW &&
4992 pref != ICMPV6_ROUTER_PREF_HIGH)
4993 pref = ICMPV6_ROUTER_PREF_MEDIUM;
4994 cfg->fc_flags |= RTF_PREF(pref);
4995 }
4996
19e42e45
RP		 4997 if (tb[RTA_ENCAP])
4998 cfg->fc_encap = tb[RTA_ENCAP];
4999
9ed59592 5000 if (tb[RTA_ENCAP_TYPE]) {
19e42e45
RP		 5001 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
5002
c255bd68 5003 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
9ed59592
DA		 5004 if (err < 0)
5005 goto errout;
5006 }
5007
32bc201e
XL		 5008 if (tb[RTA_EXPIRES]) {
5009 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
5010
5011 if (addrconf_finite_timeout(timeout)) {
5012 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
5013 cfg->fc_flags |= RTF_EXPIRES;
5014 }
5015 }
5016
86872cb5
TG		 5017 err = 0;
5018errout:
5019 return err;
1da177e4
LT		 5020}
5021
6b9ea5a6 5022struct rt6_nh {
8d1c802b 5023 struct fib6_info *fib6_info;
6b9ea5a6 5024 struct fib6_config r_cfg;
6b9ea5a6
RP		 5025 struct list_head next;
5026};
5027
d4ead6b3
DA		 5028static int ip6_route_info_append(struct net *net,
5029 struct list_head *rt6_nh_list,
8d1c802b
DA		 5030 struct fib6_info *rt,
5031 struct fib6_config *r_cfg)
6b9ea5a6
RP		 5032{
5033 struct rt6_nh *nh;
6b9ea5a6
RP		 5034 int err = -EEXIST;
5035
5036 list_for_each_entry(nh, rt6_nh_list, next) {
8d1c802b
DA		 5037 /* check if fib6_info already exists */
5038 if (rt6_duplicate_nexthop(nh->fib6_info, rt))
6b9ea5a6
RP		 5039 return err;
5040 }
5041
5042 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
5043 if (!nh)
5044 return -ENOMEM;
8d1c802b 5045 nh->fib6_info = rt;
6b9ea5a6
RP		 5046 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
5047 list_add_tail(&nh->next, rt6_nh_list);
5048
5049 return 0;
5050}
5051
8d1c802b
DA		 5052static void ip6_route_mpath_notify(struct fib6_info *rt,
5053 struct fib6_info *rt_last,
3b1137fe
DA		 5054 struct nl_info *info,
5055 __u16 nlflags)
5056{
5057 /* if this is an APPEND route, then rt points to the first route
5058 * inserted and rt_last points to last route inserted. Userspace
5059 * wants a consistent dump of the route which starts at the first
5060 * nexthop. Since sibling routes are always added at the end of
5061 * the list, find the first sibling of the last route appended
5062 */
93c2fb25
DA		 5063 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) {
5064 rt = list_first_entry(&rt_last->fib6_siblings,
8d1c802b 5065 struct fib6_info,
93c2fb25 5066 fib6_siblings);
3b1137fe
DA		 5067 }
5068
5069 if (rt)
5070 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
5071}
5072
0ee0f47c
IS		 5073static bool ip6_route_mpath_should_notify(const struct fib6_info *rt)
5074{
5075 bool rt_can_ecmp = rt6_qualify_for_ecmp(rt);
5076 bool should_notify = false;
5077 struct fib6_info *leaf;
5078 struct fib6_node *fn;
5079
5080 rcu_read_lock();
5081 fn = rcu_dereference(rt->fib6_node);
5082 if (!fn)
5083 goto out;
5084
5085 leaf = rcu_dereference(fn->leaf);
5086 if (!leaf)
5087 goto out;
5088
5089 if (rt == leaf ||
5090 (rt_can_ecmp && rt->fib6_metric == leaf->fib6_metric &&
5091 rt6_qualify_for_ecmp(leaf)))
5092 should_notify = true;
5093out:
5094 rcu_read_unlock();
5095
5096 return should_notify;
5097}
5098
333c4301
DA		 5099static int ip6_route_multipath_add(struct fib6_config *cfg,
5100 struct netlink_ext_ack *extack)
51ebd318 5101{
8d1c802b 5102 struct fib6_info *rt_notif = NULL, *rt_last = NULL;
3b1137fe 5103 struct nl_info *info = &cfg->fc_nlinfo;
51ebd318
ND		 5104 struct fib6_config r_cfg;
5105 struct rtnexthop *rtnh;
8d1c802b 5106 struct fib6_info *rt;
6b9ea5a6
RP		 5107 struct rt6_nh *err_nh;
5108 struct rt6_nh *nh, *nh_safe;
3b1137fe 5109 __u16 nlflags;
51ebd318
ND		 5110 int remaining;
5111 int attrlen;
6b9ea5a6
RP		 5112 int err = 1;
5113 int nhn = 0;
5114 int replace = (cfg->fc_nlinfo.nlh &&
5115 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
5116 LIST_HEAD(rt6_nh_list);
51ebd318 5117
3b1137fe
DA		 5118 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
5119 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
5120 nlflags |= NLM_F_APPEND;
5121
35f1b4e9 5122 remaining = cfg->fc_mp_len;
51ebd318 5123 rtnh = (struct rtnexthop *)cfg->fc_mp;
51ebd318 5124
6b9ea5a6 5125 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
8d1c802b 5126 * fib6_info structs per nexthop
6b9ea5a6 5127 */
51ebd318
ND		 5128 while (rtnh_ok(rtnh, remaining)) {
5129 memcpy(&r_cfg, cfg, sizeof(*cfg));
5130 if (rtnh->rtnh_ifindex)
5131 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5132
5133 attrlen = rtnh_attrlen(rtnh);
5134 if (attrlen > 0) {
5135 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5136
5137 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5138 if (nla) {
67b61f6c 5139 r_cfg.fc_gateway = nla_get_in6_addr(nla);
51ebd318
ND		 5140 r_cfg.fc_flags |= RTF_GATEWAY;
5141 }
19e42e45
RP		 5142 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
5143 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
5144 if (nla)
5145 r_cfg.fc_encap_type = nla_get_u16(nla);
51ebd318 5146 }
6b9ea5a6 5147
68e2ffde 5148 r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK);
acb54e3c 5149 rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack);
8c5b83f0
RP		 5150 if (IS_ERR(rt)) {
5151 err = PTR_ERR(rt);
5152 rt = NULL;
6b9ea5a6 5153 goto cleanup;
8c5b83f0 5154 }
b5d2d75e
DA		 5155 if (!rt6_qualify_for_ecmp(rt)) {
5156 err = -EINVAL;
5157 NL_SET_ERR_MSG(extack,
5158 "Device only routes can not be added for IPv6 using the multipath API.");
5159 fib6_info_release(rt);
5160 goto cleanup;
5161 }
6b9ea5a6 5162
1cf844c7 5163 rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1;
398958ae 5164
d4ead6b3
DA		 5165 err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
5166 rt, &r_cfg);
51ebd318 5167 if (err) {
93531c67 5168 fib6_info_release(rt);
6b9ea5a6
RP		 5169 goto cleanup;
5170 }
5171
5172 rtnh = rtnh_next(rtnh, &remaining);
5173 }
5174
9eee3b49
IS		 5175 if (list_empty(&rt6_nh_list)) {
5176 NL_SET_ERR_MSG(extack,
5177 "Invalid nexthop configuration - no valid nexthops");
5178 return -EINVAL;
5179 }
5180
3b1137fe
DA		 5181 /* for add and replace send one notification with all nexthops.
5182 * Skip the notification in fib6_add_rt2node and send one with
5183 * the full route when done
5184 */
5185 info->skip_notify = 1;
5186
ebee3cad
IS		 5187 /* For add and replace, send one notification with all nexthops. For
5188 * append, send one notification with all appended nexthops.
5189 */
5190 info->skip_notify_kernel = 1;
5191
6b9ea5a6
RP		 5192 err_nh = NULL;
5193 list_for_each_entry(nh, &rt6_nh_list, next) {
8d1c802b
DA		 5194 err = __ip6_ins_rt(nh->fib6_info, info, extack);
5195 fib6_info_release(nh->fib6_info);
93531c67 5196
f7225172
DA		 5197 if (!err) {
5198 /* save reference to last route successfully inserted */
5199 rt_last = nh->fib6_info;
5200
5201 /* save reference to first route for notification */
5202 if (!rt_notif)
5203 rt_notif = nh->fib6_info;
5204 }
3b1137fe 5205
8d1c802b
DA		 5206 /* nh->fib6_info is used or freed at this point, reset to NULL*/
5207 nh->fib6_info = NULL;
6b9ea5a6
RP		 5208 if (err) {
5209 if (replace && nhn)
a5a82d84
JK		 5210 NL_SET_ERR_MSG_MOD(extack,
5211 "multipath route replace failed (check consistency of installed routes)");
6b9ea5a6
RP		 5212 err_nh = nh;
5213 goto add_errout;
51ebd318 5214 }
6b9ea5a6 5215
1a72418b 5216 /* Because each route is added like a single route we remove
27596472
MK		 5217 * these flags after the first nexthop: if there is a collision,
5218 * we have already failed to add the first nexthop:
5219 * fib6_add_rt2node() has rejected it; when replacing, old
5220 * nexthops have been replaced by first new, the rest should
5221 * be added to it.
1a72418b 5222 */
27596472
MK		 5223 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
5224 NLM_F_REPLACE);
afecdb37 5225 cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE;
6b9ea5a6
RP		 5226 nhn++;
5227 }
5228
0ee0f47c
IS		 5229 /* An in-kernel notification should only be sent in case the new
5230 * multipath route is added as the first route in the node, or if
5231 * it was appended to it. We pass 'rt_notif' since it is the first
5232 * sibling and might allow us to skip some checks in the replace case.
5233 */
5234 if (ip6_route_mpath_should_notify(rt_notif)) {
5235 enum fib_event_type fib_event;
5236
5237 if (rt_notif->fib6_nsiblings != nhn - 1)
5238 fib_event = FIB_EVENT_ENTRY_APPEND;
5239 else
caafb250 5240 fib_event = FIB_EVENT_ENTRY_REPLACE;
0ee0f47c
IS		 5241
5242 err = call_fib6_multipath_entry_notifiers(info->nl_net,
5243 fib_event, rt_notif,
5244 nhn - 1, extack);
5245 if (err) {
5246 /* Delete all the siblings that were just added */
5247 err_nh = NULL;
5248 goto add_errout;
5249 }
5250 }
ebee3cad 5251
3b1137fe
DA		 5252 /* success ... tell user about new route */
5253 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
6b9ea5a6
RP		 5254 goto cleanup;
5255
5256add_errout:
3b1137fe
DA		 5257 /* send notification for routes that were added so that
5258 * the delete notifications sent by ip6_route_del are
5259 * coherent
5260 */
5261 if (rt_notif)
5262 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
5263
6b9ea5a6
RP		 5264 /* Delete routes that were already added */
5265 list_for_each_entry(nh, &rt6_nh_list, next) {
5266 if (err_nh == nh)
5267 break;
333c4301 5268 ip6_route_del(&nh->r_cfg, extack);
6b9ea5a6
RP		 5269 }
5270
5271cleanup:
5272 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
8d1c802b
DA		 5273 if (nh->fib6_info)
5274 fib6_info_release(nh->fib6_info);
6b9ea5a6
RP		 5275 list_del(&nh->next);
5276 kfree(nh);
5277 }
5278
5279 return err;
5280}
5281
333c4301
DA		 5282static int ip6_route_multipath_del(struct fib6_config *cfg,
5283 struct netlink_ext_ack *extack)
6b9ea5a6
RP		 5284{
5285 struct fib6_config r_cfg;
5286 struct rtnexthop *rtnh;
5287 int remaining;
5288 int attrlen;
5289 int err = 1, last_err = 0;
5290
5291 remaining = cfg->fc_mp_len;
5292 rtnh = (struct rtnexthop *)cfg->fc_mp;
5293
5294 /* Parse a Multipath Entry */
5295 while (rtnh_ok(rtnh, remaining)) {
5296 memcpy(&r_cfg, cfg, sizeof(*cfg));
5297 if (rtnh->rtnh_ifindex)
5298 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5299
5300 attrlen = rtnh_attrlen(rtnh);
5301 if (attrlen > 0) {
5302 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5303
5304 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5305 if (nla) {
5306 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
5307 r_cfg.fc_flags |= RTF_GATEWAY;
5308 }
5309 }
333c4301 5310 err = ip6_route_del(&r_cfg, extack);
6b9ea5a6
RP		 5311 if (err)
5312 last_err = err;
5313
51ebd318
ND		 5314 rtnh = rtnh_next(rtnh, &remaining);
5315 }
5316
5317 return last_err;
5318}
5319
c21ef3e3
DA		 5320static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5321 struct netlink_ext_ack *extack)
1da177e4 5322{
86872cb5
TG		 5323 struct fib6_config cfg;
5324 int err;
1da177e4 5325
333c4301 5326 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
86872cb5
TG		 5327 if (err < 0)
5328 return err;
5329
5b98324e
DA		 5330 if (cfg.fc_nh_id &&
5331 !nexthop_find_by_id(sock_net(skb->sk), cfg.fc_nh_id)) {
5332 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
5333 return -EINVAL;
5334 }
5335
51ebd318 5336 if (cfg.fc_mp)
333c4301 5337 return ip6_route_multipath_del(&cfg, extack);
0ae81335
DA		 5338 else {
5339 cfg.fc_delete_all_nh = 1;
333c4301 5340 return ip6_route_del(&cfg, extack);
0ae81335 5341 }
1da177e4
LT		 5342}
5343
c21ef3e3
DA		 5344static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5345 struct netlink_ext_ack *extack)
1da177e4 5346{
86872cb5
TG		 5347 struct fib6_config cfg;
5348 int err;
1da177e4 5349
333c4301 5350 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
86872cb5
TG		 5351 if (err < 0)
5352 return err;
5353
67f69513
DA		 5354 if (cfg.fc_metric == 0)
5355 cfg.fc_metric = IP6_RT_PRIO_USER;
5356
51ebd318 5357 if (cfg.fc_mp)
333c4301 5358 return ip6_route_multipath_add(&cfg, extack);
51ebd318 5359 else
acb54e3c 5360 return ip6_route_add(&cfg, GFP_KERNEL, extack);
1da177e4
LT		 5361}
5362
a1b7a1f0
DA		 5363/* add the overhead of this fib6_nh to nexthop_len */
5364static int rt6_nh_nlmsg_size(struct fib6_nh *nh, void *arg)
339bf98f 5365{
a1b7a1f0 5366 int *nexthop_len = arg;
beb1afac 5367
a1b7a1f0
DA		 5368 *nexthop_len += nla_total_size(0) /* RTA_MULTIPATH */
5369 + NLA_ALIGN(sizeof(struct rtnexthop))
5370 + nla_total_size(16); /* RTA_GATEWAY */
5371
5372 if (nh->fib_nh_lws) {
5373 /* RTA_ENCAP_TYPE */
5374 *nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
5375 /* RTA_ENCAP */
5376 *nexthop_len += nla_total_size(2);
5377 }
f88d8ea6 5378
a1b7a1f0
DA		 5379 return 0;
5380}
beb1afac 5381
a1b7a1f0
DA		 5382static size_t rt6_nlmsg_size(struct fib6_info *f6i)
5383{
5384 int nexthop_len;
5385
5386 if (f6i->nh) {
5387 nexthop_len = nla_total_size(4); /* RTA_NH_ID */
5388 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_nlmsg_size,
5389 &nexthop_len);
5390 } else {
5391 struct fib6_nh *nh = f6i->fib6_nh;
5392
5393 nexthop_len = 0;
5394 if (f6i->fib6_nsiblings) {
5395 nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */
5396 + NLA_ALIGN(sizeof(struct rtnexthop))
5397 + nla_total_size(16) /* RTA_GATEWAY */
5398 + lwtunnel_get_encap_size(nh->fib_nh_lws);
5399
5400 nexthop_len *= f6i->fib6_nsiblings;
5401 }
5402 nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
beb1afac
DA		 5403 }
5404
339bf98f
TG		 5405 return NLMSG_ALIGN(sizeof(struct rtmsg))
5406 + nla_total_size(16) /* RTA_SRC */
5407 + nla_total_size(16) /* RTA_DST */
5408 + nla_total_size(16) /* RTA_GATEWAY */
5409 + nla_total_size(16) /* RTA_PREFSRC */
5410 + nla_total_size(4) /* RTA_TABLE */
5411 + nla_total_size(4) /* RTA_IIF */
5412 + nla_total_size(4) /* RTA_OIF */
5413 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 5414 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
ea697639 5415 + nla_total_size(sizeof(struct rta_cacheinfo))
c78ba6d6 5416 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
19e42e45 5417 + nla_total_size(1) /* RTA_PREF */
beb1afac
DA		 5418 + nexthop_len;
5419}
5420
f88d8ea6
DA		 5421static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh,
5422 unsigned char *flags)
5423{
5424 if (nexthop_is_multipath(nh)) {
5425 struct nlattr *mp;
5426
4255ff05 5427 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
f88d8ea6
DA		 5428 if (!mp)
5429 goto nla_put_failure;
5430
7bdf4de1 5431 if (nexthop_mpath_fill_node(skb, nh, AF_INET6))
f88d8ea6
DA		 5432 goto nla_put_failure;
5433
5434 nla_nest_end(skb, mp);
5435 } else {
5436 struct fib6_nh *fib6_nh;
5437
5438 fib6_nh = nexthop_fib6_nh(nh);
7bdf4de1 5439 if (fib_nexthop_info(skb, &fib6_nh->nh_common, AF_INET6,
f88d8ea6
DA		 5440 flags, false) < 0)
5441 goto nla_put_failure;
5442 }
5443
5444 return 0;
5445
5446nla_put_failure:
5447 return -EMSGSIZE;
5448}
5449
d4ead6b3 5450static int rt6_fill_node(struct net *net, struct sk_buff *skb,
8d1c802b 5451 struct fib6_info *rt, struct dst_entry *dst,
d4ead6b3 5452 struct in6_addr *dest, struct in6_addr *src,
15e47304 5453 int iif, int type, u32 portid, u32 seq,
f8cfe2ce 5454 unsigned int flags)
1da177e4 5455{
22d0bd82
XL		 5456 struct rt6_info *rt6 = (struct rt6_info *)dst;
5457 struct rt6key *rt6_dst, *rt6_src;
5458 u32 *pmetrics, table, rt6_flags;
f88d8ea6 5459 unsigned char nh_flags = 0;
2d7202bf 5460 struct nlmsghdr *nlh;
22d0bd82 5461 struct rtmsg *rtm;
d4ead6b3 5462 long expires = 0;
1da177e4 5463
15e47304 5464 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
38308473 5465 if (!nlh)
26932566 5466 return -EMSGSIZE;
2d7202bf 5467
22d0bd82
XL		 5468 if (rt6) {
5469 rt6_dst = &rt6->rt6i_dst;
5470 rt6_src = &rt6->rt6i_src;
5471 rt6_flags = rt6->rt6i_flags;
5472 } else {
5473 rt6_dst = &rt->fib6_dst;
5474 rt6_src = &rt->fib6_src;
5475 rt6_flags = rt->fib6_flags;
5476 }
5477
2d7202bf 5478 rtm = nlmsg_data(nlh);
1da177e4 5479 rtm->rtm_family = AF_INET6;
22d0bd82
XL		 5480 rtm->rtm_dst_len = rt6_dst->plen;
5481 rtm->rtm_src_len = rt6_src->plen;
1da177e4 5482 rtm->rtm_tos = 0;
93c2fb25
DA		 5483 if (rt->fib6_table)
5484 table = rt->fib6_table->tb6_id;
c71099ac 5485 else
9e762a4a 5486 table = RT6_TABLE_UNSPEC;
97f0082a 5487 rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT;
c78679e8
DM		 5488 if (nla_put_u32(skb, RTA_TABLE, table))
5489 goto nla_put_failure;
e8478e80
DA		 5490
5491 rtm->rtm_type = rt->fib6_type;
1da177e4
LT		 5492 rtm->rtm_flags = 0;
5493 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
93c2fb25 5494 rtm->rtm_protocol = rt->fib6_protocol;
1da177e4 5495
22d0bd82 5496 if (rt6_flags & RTF_CACHE)
1da177e4
LT		 5497 rtm->rtm_flags |= RTM_F_CLONED;
5498
d4ead6b3
DA		 5499 if (dest) {
5500 if (nla_put_in6_addr(skb, RTA_DST, dest))
c78679e8 5501 goto nla_put_failure;
1ab1457c 5502 rtm->rtm_dst_len = 128;
1da177e4 5503 } else if (rtm->rtm_dst_len)
22d0bd82 5504 if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr))
c78679e8 5505 goto nla_put_failure;
1da177e4
LT		 5506#ifdef CONFIG_IPV6_SUBTREES
5507 if (src) {
930345ea 5508 if (nla_put_in6_addr(skb, RTA_SRC, src))
c78679e8 5509 goto nla_put_failure;
1ab1457c 5510 rtm->rtm_src_len = 128;
c78679e8 5511 } else if (rtm->rtm_src_len &&
22d0bd82 5512 nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr))
c78679e8 5513 goto nla_put_failure;
1da177e4 5514#endif
7bc570c8
YH		 5515 if (iif) {
5516#ifdef CONFIG_IPV6_MROUTE
22d0bd82 5517 if (ipv6_addr_is_multicast(&rt6_dst->addr)) {
fd61c6ba
DA		 5518 int err = ip6mr_get_route(net, skb, rtm, portid);
5519
5520 if (err == 0)
5521 return 0;
5522 if (err < 0)
5523 goto nla_put_failure;
7bc570c8
YH		 5524 } else
5525#endif
c78679e8
DM		 5526 if (nla_put_u32(skb, RTA_IIF, iif))
5527 goto nla_put_failure;
d4ead6b3 5528 } else if (dest) {
1da177e4 5529 struct in6_addr saddr_buf;
d4ead6b3 5530 if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 &&
930345ea 5531 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 5532 goto nla_put_failure;
1da177e4 5533 }
2d7202bf 5534
93c2fb25 5535 if (rt->fib6_prefsrc.plen) {
c3968a85 5536 struct in6_addr saddr_buf;
93c2fb25 5537 saddr_buf = rt->fib6_prefsrc.addr;
930345ea 5538 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
c78679e8 5539 goto nla_put_failure;
c3968a85
DW		 5540 }
5541
d4ead6b3
DA		 5542 pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics;
5543 if (rtnetlink_put_metrics(skb, pmetrics) < 0)
2d7202bf
TG		 5544 goto nla_put_failure;
5545
93c2fb25 5546 if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric))
c78679e8 5547 goto nla_put_failure;
8253947e 5548
beb1afac
DA		 5549 /* For multipath routes, walk the siblings list and add
5550 * each as a nexthop within RTA_MULTIPATH.
5551 */
22d0bd82
XL		 5552 if (rt6) {
5553 if (rt6_flags & RTF_GATEWAY &&
5554 nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway))
5555 goto nla_put_failure;
5556
5557 if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex))
5558 goto nla_put_failure;
5559 } else if (rt->fib6_nsiblings) {
8d1c802b 5560 struct fib6_info *sibling, *next_sibling;
beb1afac
DA		 5561 struct nlattr *mp;
5562
ae0be8de 5563 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
beb1afac
DA		 5564 if (!mp)
5565 goto nla_put_failure;
5566
1cf844c7 5567 if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common,
7bdf4de1 5568 rt->fib6_nh->fib_nh_weight, AF_INET6) < 0)
beb1afac
DA		 5569 goto nla_put_failure;
5570
5571 list_for_each_entry_safe(sibling, next_sibling,
93c2fb25 5572 &rt->fib6_siblings, fib6_siblings) {
1cf844c7 5573 if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common,
7bdf4de1
DS		 5574 sibling->fib6_nh->fib_nh_weight,
5575 AF_INET6) < 0)
beb1afac
DA		 5576 goto nla_put_failure;
5577 }
5578
5579 nla_nest_end(skb, mp);
f88d8ea6
DA		 5580 } else if (rt->nh) {
5581 if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id))
5582 goto nla_put_failure;
ecc5663c 5583
f88d8ea6
DA		 5584 if (nexthop_is_blackhole(rt->nh))
5585 rtm->rtm_type = RTN_BLACKHOLE;
5586
4f80116d
RP		 5587 if (net->ipv4.sysctl_nexthop_compat_mode &&
5588 rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0)
f88d8ea6
DA		 5589 goto nla_put_failure;
5590
5591 rtm->rtm_flags |= nh_flags;
5592 } else {
7bdf4de1 5593 if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, AF_INET6,
ecc5663c 5594 &nh_flags, false) < 0)
beb1afac 5595 goto nla_put_failure;
ecc5663c
DA		 5596
5597 rtm->rtm_flags |= nh_flags;
beb1afac
DA		 5598 }
5599
22d0bd82 5600 if (rt6_flags & RTF_EXPIRES) {
14895687
DA		 5601 expires = dst ? dst->expires : rt->expires;
5602 expires -= jiffies;
5603 }
69cdf8f9 5604
bb3c4ab9
IS		 5605 if (!dst) {
5606 if (rt->offload)
5607 rtm->rtm_flags |= RTM_F_OFFLOAD;
5608 if (rt->trap)
5609 rtm->rtm_flags |= RTM_F_TRAP;
5610 }
5611
d4ead6b3 5612 if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0)
e3703b3d 5613 goto nla_put_failure;
2d7202bf 5614
22d0bd82 5615 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags)))
c78ba6d6
LR		 5616 goto nla_put_failure;
5617
19e42e45 5618
053c095a
JB		 5619 nlmsg_end(skb, nlh);
5620 return 0;
2d7202bf
TG		 5621
5622nla_put_failure:
26932566
PM		 5623 nlmsg_cancel(skb, nlh);
5624 return -EMSGSIZE;
1da177e4
LT		 5625}
5626
2c170e07
DA		 5627static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg)
5628{
5629 const struct net_device *dev = arg;
5630
5631 if (nh->fib_nh_dev == dev)
5632 return 1;
5633
5634 return 0;
5635}
5636
13e38901
DA		 5637static bool fib6_info_uses_dev(const struct fib6_info *f6i,
5638 const struct net_device *dev)
5639{
2c170e07
DA		 5640 if (f6i->nh) {
5641 struct net_device *_dev = (struct net_device *)dev;
5642
5643 return !!nexthop_for_each_fib6_nh(f6i->nh,
5644 fib6_info_nh_uses_dev,
5645 _dev);
5646 }
5647
1cf844c7 5648 if (f6i->fib6_nh->fib_nh_dev == dev)
13e38901
DA		 5649 return true;
5650
5651 if (f6i->fib6_nsiblings) {
5652 struct fib6_info *sibling, *next_sibling;
5653
5654 list_for_each_entry_safe(sibling, next_sibling,
5655 &f6i->fib6_siblings, fib6_siblings) {
1cf844c7 5656 if (sibling->fib6_nh->fib_nh_dev == dev)
13e38901
DA		 5657 return true;
5658 }
5659 }
5660
5661 return false;
5662}
5663
1e47b483
SB		 5664struct fib6_nh_exception_dump_walker {
5665 struct rt6_rtnl_dump_arg *dump;
5666 struct fib6_info *rt;
5667 unsigned int flags;
5668 unsigned int skip;
5669 unsigned int count;
5670};
5671
5672static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg)
5673{
5674 struct fib6_nh_exception_dump_walker *w = arg;
5675 struct rt6_rtnl_dump_arg *dump = w->dump;
5676 struct rt6_exception_bucket *bucket;
5677 struct rt6_exception *rt6_ex;
5678 int i, err;
5679
5680 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
5681 if (!bucket)
5682 return 0;
5683
5684 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
5685 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
5686 if (w->skip) {
5687 w->skip--;
5688 continue;
5689 }
5690
5691 /* Expiration of entries doesn't bump sernum, insertion
5692 * does. Removal is triggered by insertion, so we can
5693 * rely on the fact that if entries change between two
5694 * partial dumps, this node is scanned again completely,
5695 * see rt6_insert_exception() and fib6_dump_table().
5696 *
5697 * Count expired entries we go through as handled
5698 * entries that we'll skip next time, in case of partial
5699 * node dump. Otherwise, if entries expire meanwhile,
5700 * we'll skip the wrong amount.
5701 */
5702 if (rt6_check_expired(rt6_ex->rt6i)) {
5703 w->count++;
5704 continue;
5705 }
5706
5707 err = rt6_fill_node(dump->net, dump->skb, w->rt,
5708 &rt6_ex->rt6i->dst, NULL, NULL, 0,
5709 RTM_NEWROUTE,
5710 NETLINK_CB(dump->cb->skb).portid,
5711 dump->cb->nlh->nlmsg_seq, w->flags);
5712 if (err)
5713 return err;
5714
5715 w->count++;
5716 }
5717 bucket++;
5718 }
5719
5720 return 0;
5721}
5722
bf9a8a06 5723/* Return -1 if done with node, number of handled routes on partial dump */
1e47b483 5724int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip)
1da177e4
LT		 5725{
5726 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
13e38901
DA		 5727 struct fib_dump_filter *filter = &arg->filter;
5728 unsigned int flags = NLM_F_MULTI;
1f17e2f2 5729 struct net *net = arg->net;
1e47b483 5730 int count = 0;
1f17e2f2 5731
421842ed 5732 if (rt == net->ipv6.fib6_null_entry)
bf9a8a06 5733 return -1;
1da177e4 5734
13e38901
DA		 5735 if ((filter->flags & RTM_F_PREFIX) &&
5736 !(rt->fib6_flags & RTF_PREFIX_RT)) {
5737 /* success since this is not a prefix route */
bf9a8a06 5738 return -1;
13e38901 5739 }
1e47b483
SB		 5740 if (filter->filter_set &&
5741 ((filter->rt_type && rt->fib6_type != filter->rt_type) ||
5742 (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) ||
5743 (filter->protocol && rt->fib6_protocol != filter->protocol))) {
5744 return -1;
5745 }
5746
5747 if (filter->filter_set ||
5748 !filter->dump_routes || !filter->dump_exceptions) {
13e38901 5749 flags |= NLM_F_DUMP_FILTERED;
f8cfe2ce 5750 }
1da177e4 5751
1e47b483
SB		 5752 if (filter->dump_routes) {
5753 if (skip) {
5754 skip--;
5755 } else {
5756 if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL,
5757 0, RTM_NEWROUTE,
5758 NETLINK_CB(arg->cb->skb).portid,
5759 arg->cb->nlh->nlmsg_seq, flags)) {
5760 return 0;
5761 }
5762 count++;
5763 }
5764 }
5765
5766 if (filter->dump_exceptions) {
5767 struct fib6_nh_exception_dump_walker w = { .dump = arg,
5768 .rt = rt,
5769 .flags = flags,
5770 .skip = skip,
5771 .count = 0 };
5772 int err;
5773
3b525691 5774 rcu_read_lock();
1e47b483
SB		 5775 if (rt->nh) {
5776 err = nexthop_for_each_fib6_nh(rt->nh,
5777 rt6_nh_dump_exceptions,
5778 &w);
5779 } else {
5780 err = rt6_nh_dump_exceptions(rt->fib6_nh, &w);
5781 }
3b525691 5782 rcu_read_unlock();
1e47b483
SB		 5783
5784 if (err)
5785 return count += w.count;
5786 }
bf9a8a06
SB		 5787
5788 return -1;
1da177e4
LT		 5789}
5790
0eff0a27
JK		 5791static int inet6_rtm_valid_getroute_req(struct sk_buff *skb,
5792 const struct nlmsghdr *nlh,
5793 struct nlattr **tb,
5794 struct netlink_ext_ack *extack)
5795{
5796 struct rtmsg *rtm;
5797 int i, err;
5798
5799 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
5800 NL_SET_ERR_MSG_MOD(extack,
5801 "Invalid header for get route request");
5802 return -EINVAL;
5803 }
5804
5805 if (!netlink_strict_get_check(skb))
8cb08174
JB		 5806 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
5807 rtm_ipv6_policy, extack);
0eff0a27
JK		 5808
5809 rtm = nlmsg_data(nlh);
5810 if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
5811 (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
5812 rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope ||
5813 rtm->rtm_type) {
5814 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
5815 return -EINVAL;
5816 }
5817 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
5818 NL_SET_ERR_MSG_MOD(extack,
5819 "Invalid flags for get route request");
5820 return -EINVAL;
5821 }
5822
8cb08174
JB		 5823 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
5824 rtm_ipv6_policy, extack);
0eff0a27
JK		 5825 if (err)
5826 return err;
5827
5828 if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
5829 (tb[RTA_DST] && !rtm->rtm_dst_len)) {
5830 NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6");
5831 return -EINVAL;
5832 }
5833
5834 for (i = 0; i <= RTA_MAX; i++) {
5835 if (!tb[i])
5836 continue;
5837
5838 switch (i) {
5839 case RTA_SRC:
5840 case RTA_DST:
5841 case RTA_IIF:
5842 case RTA_OIF:
5843 case RTA_MARK:
5844 case RTA_UID:
5845 case RTA_SPORT:
5846 case RTA_DPORT:
5847 case RTA_IP_PROTO:
5848 break;
5849 default:
5850 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
5851 return -EINVAL;
5852 }
5853 }
5854
5855 return 0;
5856}
5857
c21ef3e3
DA		 5858static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5859 struct netlink_ext_ack *extack)
1da177e4 5860{
3b1e0a65 5861 struct net *net = sock_net(in_skb->sk);
ab364a6f 5862 struct nlattr *tb[RTA_MAX+1];
18c3a61c 5863 int err, iif = 0, oif = 0;
a68886a6 5864 struct fib6_info *from;
18c3a61c 5865 struct dst_entry *dst;
ab364a6f 5866 struct rt6_info *rt;
1da177e4 5867 struct sk_buff *skb;
ab364a6f 5868 struct rtmsg *rtm;
744486d4 5869 struct flowi6 fl6 = {};
18c3a61c 5870 bool fibmatch;
1da177e4 5871
0eff0a27 5872 err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
ab364a6f
TG		 5873 if (err < 0)
5874 goto errout;
1da177e4 5875
ab364a6f 5876 err = -EINVAL;
38b7097b
HFS		 5877 rtm = nlmsg_data(nlh);
5878 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
18c3a61c 5879 fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
1da177e4 5880
ab364a6f
TG		 5881 if (tb[RTA_SRC]) {
5882 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
5883 goto errout;
5884
4e3fd7a0 5885 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
ab364a6f
TG		 5886 }
5887
5888 if (tb[RTA_DST]) {
5889 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
5890 goto errout;
5891
4e3fd7a0 5892 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
ab364a6f
TG		 5893 }
5894
5895 if (tb[RTA_IIF])
5896 iif = nla_get_u32(tb[RTA_IIF]);
5897
5898 if (tb[RTA_OIF])
72331bc0 5899 oif = nla_get_u32(tb[RTA_OIF]);
1da177e4 5900
2e47b291
LC		 5901 if (tb[RTA_MARK])
5902 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
5903
622ec2c9
LC		 5904 if (tb[RTA_UID])
5905 fl6.flowi6_uid = make_kuid(current_user_ns(),
5906 nla_get_u32(tb[RTA_UID]));
5907 else
5908 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
5909
eacb9384
RP		 5910 if (tb[RTA_SPORT])
5911 fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]);
5912
5913 if (tb[RTA_DPORT])
5914 fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]);
5915
5916 if (tb[RTA_IP_PROTO]) {
5917 err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
5e1a99ea
HL		 5918 &fl6.flowi6_proto, AF_INET6,
5919 extack);
eacb9384
RP		 5920 if (err)
5921 goto errout;
5922 }
5923
1da177e4
LT		 5924 if (iif) {
5925 struct net_device *dev;
72331bc0
SL		 5926 int flags = 0;
5927
121622db
FW		 5928 rcu_read_lock();
5929
5930 dev = dev_get_by_index_rcu(net, iif);
1da177e4 5931 if (!dev) {
121622db 5932 rcu_read_unlock();
1da177e4 5933 err = -ENODEV;
ab364a6f 5934 goto errout;
1da177e4 5935 }
72331bc0
SL		 5936
5937 fl6.flowi6_iif = iif;
5938
5939 if (!ipv6_addr_any(&fl6.saddr))
5940 flags |= RT6_LOOKUP_F_HAS_SADDR;
5941
b75cc8f9 5942 dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags);
121622db
FW		 5943
5944 rcu_read_unlock();
72331bc0
SL		 5945 } else {
5946 fl6.flowi6_oif = oif;
5947
58acfd71 5948 dst = ip6_route_output(net, NULL, &fl6);
18c3a61c
RP		 5949 }
5950
18c3a61c
RP		 5951
5952 rt = container_of(dst, struct rt6_info, dst);
5953 if (rt->dst.error) {
5954 err = rt->dst.error;
5955 ip6_rt_put(rt);
5956 goto errout;
1da177e4
LT		 5957 }
5958
9d6acb3b
WC		 5959 if (rt == net->ipv6.ip6_null_entry) {
5960 err = rt->dst.error;
5961 ip6_rt_put(rt);
5962 goto errout;
5963 }
5964
ab364a6f 5965 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
38308473 5966 if (!skb) {
94e187c0 5967 ip6_rt_put(rt);
ab364a6f
TG		 5968 err = -ENOBUFS;
5969 goto errout;
5970 }
1da177e4 5971
d8d1f30b 5972 skb_dst_set(skb, &rt->dst);
a68886a6
DA		 5973
5974 rcu_read_lock();
5975 from = rcu_dereference(rt->from);
886b7a50
MKL		 5976 if (from) {
5977 if (fibmatch)
5978 err = rt6_fill_node(net, skb, from, NULL, NULL, NULL,
5979 iif, RTM_NEWROUTE,
5980 NETLINK_CB(in_skb).portid,
5981 nlh->nlmsg_seq, 0);
5982 else
5983 err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
5984 &fl6.saddr, iif, RTM_NEWROUTE,
5985 NETLINK_CB(in_skb).portid,
5986 nlh->nlmsg_seq, 0);
5987 } else {
5988 err = -ENETUNREACH;
5989 }
a68886a6
DA		 5990 rcu_read_unlock();
5991
1da177e4 5992 if (err < 0) {
ab364a6f
TG		 5993 kfree_skb(skb);
5994 goto errout;
1da177e4
LT		 5995 }
5996
15e47304 5997 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
ab364a6f 5998errout:
1da177e4 5999 return err;
1da177e4
LT		 6000}
6001
8d1c802b 6002void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
37a1d361 6003 unsigned int nlm_flags)
1da177e4
LT		 6004{
6005 struct sk_buff *skb;
5578689a 6006 struct net *net = info->nl_net;
528c4ceb
DL		 6007 u32 seq;
6008 int err;
6009
6010 err = -ENOBUFS;
38308473 6011 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
86872cb5 6012
19e42e45 6013 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
38308473 6014 if (!skb)
21713ebc
TG		 6015 goto errout;
6016
d4ead6b3
DA		 6017 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
6018 event, info->portid, seq, nlm_flags);
26932566
PM		 6019 if (err < 0) {
6020 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
6021 WARN_ON(err == -EMSGSIZE);
6022 kfree_skb(skb);
6023 goto errout;
6024 }
15e47304 6025 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
1ce85fe4
PNA		 6026 info->nlh, gfp_any());
6027 return;
21713ebc
TG		 6028errout:
6029 if (err < 0)
5578689a 6030 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 6031}
6032
19a3b7ee
DA		 6033void fib6_rt_update(struct net *net, struct fib6_info *rt,
6034 struct nl_info *info)
6035{
6036 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
6037 struct sk_buff *skb;
6038 int err = -ENOBUFS;
6039
6040 /* call_fib6_entry_notifiers will be removed when in-kernel notifier
6041 * is implemented and supported for nexthop objects
6042 */
6043 call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, rt, NULL);
6044
6045 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
6046 if (!skb)
6047 goto errout;
6048
6049 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
6050 RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE);
6051 if (err < 0) {
6052 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
6053 WARN_ON(err == -EMSGSIZE);
6054 kfree_skb(skb);
6055 goto errout;
6056 }
6057 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
6058 info->nlh, gfp_any());
6059 return;
6060errout:
6061 if (err < 0)
6062 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6063}
6064
8ed67789 6065static int ip6_route_dev_notify(struct notifier_block *this,
351638e7 6066 unsigned long event, void *ptr)
8ed67789 6067{
351638e7 6068 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
c346dca1 6069 struct net *net = dev_net(dev);
8ed67789 6070
242d3a49
WC		 6071 if (!(dev->flags & IFF_LOOPBACK))
6072 return NOTIFY_OK;
6073
6074 if (event == NETDEV_REGISTER) {
1cf844c7 6075 net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev;
d8d1f30b 6076 net->ipv6.ip6_null_entry->dst.dev = dev;
8ed67789
DL		 6077 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
6078#ifdef CONFIG_IPV6_MULTIPLE_TABLES
d8d1f30b 6079 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
8ed67789 6080 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
d8d1f30b 6081 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
8ed67789 6082 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
242d3a49 6083#endif
76da0704
WC		 6084 } else if (event == NETDEV_UNREGISTER &&
6085 dev->reg_state != NETREG_UNREGISTERED) {
6086 /* NETDEV_UNREGISTER could be fired for multiple times by
6087 * netdev_wait_allrefs(). Make sure we only call this once.
6088 */
12d94a80 6089 in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
242d3a49 6090#ifdef CONFIG_IPV6_MULTIPLE_TABLES
12d94a80
ED		 6091 in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
6092 in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
8ed67789
DL		 6093#endif
6094 }
6095
6096 return NOTIFY_OK;
6097}
6098
1da177e4
LT		 6099/*
6100 * /proc
6101 */
6102
6103#ifdef CONFIG_PROC_FS
1da177e4
LT		 6104static int rt6_stats_seq_show(struct seq_file *seq, void *v)
6105{
69ddb805 6106 struct net *net = (struct net *)seq->private;
1da177e4 6107 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 6108 net->ipv6.rt6_stats->fib_nodes,
6109 net->ipv6.rt6_stats->fib_route_nodes,
81eb8447 6110 atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc),
69ddb805
DL		 6111 net->ipv6.rt6_stats->fib_rt_entries,
6112 net->ipv6.rt6_stats->fib_rt_cache,
fc66f95c 6113 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
69ddb805 6114 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 6115
6116 return 0;
6117}
1da177e4
LT		 6118#endif /* CONFIG_PROC_FS */
6119
6120#ifdef CONFIG_SYSCTL
6121
32927393
CH		 6122static int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
6123 void *buffer, size_t *lenp, loff_t *ppos)
1da177e4 6124{
c486da34
LAG		 6125 struct net *net;
6126 int delay;
f0fb9b28 6127 int ret;
c486da34 6128 if (!write)
1da177e4 6129 return -EINVAL;
c486da34
LAG		 6130
6131 net = (struct net *)ctl->extra1;
6132 delay = net->ipv6.sysctl.flush_delay;
f0fb9b28
AP		 6133 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6134 if (ret)
6135 return ret;
6136
2ac3ac8f 6137 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
c486da34 6138 return 0;
1da177e4
LT		 6139}
6140
ed792e28 6141static struct ctl_table ipv6_route_table_template[] = {
1ab1457c 6142 {
1da177e4 6143 .procname = "flush",
4990509f 6144 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 6145 .maxlen = sizeof(int),
89c8b3a1 6146 .mode = 0200,
6d9f239a 6147 .proc_handler = ipv6_sysctl_rtcache_flush
1da177e4
LT		 6148 },
6149 {
1da177e4 6150 .procname = "gc_thresh",
9a7ec3a9 6151 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 6152 .maxlen = sizeof(int),
6153 .mode = 0644,
6d9f239a 6154 .proc_handler = proc_dointvec,
1da177e4
LT		 6155 },
6156 {
1da177e4 6157 .procname = "max_size",
4990509f 6158 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 6159 .maxlen = sizeof(int),
6160 .mode = 0644,
6d9f239a 6161 .proc_handler = proc_dointvec,
1da177e4
LT		 6162 },
6163 {
1da177e4 6164 .procname = "gc_min_interval",
4990509f 6165 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 6166 .maxlen = sizeof(int),
6167 .mode = 0644,
6d9f239a 6168 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 6169 },
6170 {
1da177e4 6171 .procname = "gc_timeout",
4990509f 6172 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 6173 .maxlen = sizeof(int),
6174 .mode = 0644,
6d9f239a 6175 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 6176 },
6177 {
1da177e4 6178 .procname = "gc_interval",
4990509f 6179 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 6180 .maxlen = sizeof(int),
6181 .mode = 0644,
6d9f239a 6182 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 6183 },
6184 {
1da177e4 6185 .procname = "gc_elasticity",
4990509f 6186 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 6187 .maxlen = sizeof(int),
6188 .mode = 0644,
f3d3f616 6189 .proc_handler = proc_dointvec,
1da177e4
LT		 6190 },
6191 {
1da177e4 6192 .procname = "mtu_expires",
4990509f 6193 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 6194 .maxlen = sizeof(int),
6195 .mode = 0644,
6d9f239a 6196 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 6197 },
6198 {
1da177e4 6199 .procname = "min_adv_mss",
4990509f 6200 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 6201 .maxlen = sizeof(int),
6202 .mode = 0644,
f3d3f616 6203 .proc_handler = proc_dointvec,
1da177e4
LT		 6204 },
6205 {
1da177e4 6206 .procname = "gc_min_interval_ms",
4990509f 6207 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 6208 .maxlen = sizeof(int),
6209 .mode = 0644,
6d9f239a 6210 .proc_handler = proc_dointvec_ms_jiffies,
1da177e4 6211 },
7c6bb7d2
DA		 6212 {
6213 .procname = "skip_notify_on_dev_down",
6214 .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down,
6215 .maxlen = sizeof(int),
6216 .mode = 0644,
b8e8a863 6217 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 6218 .extra1 = SYSCTL_ZERO,
6219 .extra2 = SYSCTL_ONE,
7c6bb7d2 6220 },
f8572d8f 6221 { }
1da177e4
LT		 6222};
6223
2c8c1e72 6224struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
760f2d01
DL		 6225{
6226 struct ctl_table *table;
6227
6228 table = kmemdup(ipv6_route_table_template,
6229 sizeof(ipv6_route_table_template),
6230 GFP_KERNEL);
5ee09105
YH		 6231
6232 if (table) {
6233 table[0].data = &net->ipv6.sysctl.flush_delay;
c486da34 6234 table[0].extra1 = net;
86393e52 6235 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5ee09105
YH		 6236 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
6237 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
6238 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
6239 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
6240 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
6241 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
6242 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
9c69fabe 6243 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
7c6bb7d2 6244 table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down;
464dc801
EB		 6245
6246 /* Don't export sysctls to unprivileged users */
6247 if (net->user_ns != &init_user_ns)
6248 table[0].procname = NULL;
5ee09105
YH		 6249 }
6250
760f2d01
DL		 6251 return table;
6252}
1da177e4
LT		 6253#endif
6254
2c8c1e72 6255static int __net_init ip6_route_net_init(struct net *net)
cdb18761 6256{
633d424b 6257 int ret = -ENOMEM;
8ed67789 6258
86393e52
AD		 6259 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
6260 sizeof(net->ipv6.ip6_dst_ops));
f2fc6a54 6261
fc66f95c
ED		 6262 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
6263 goto out_ip6_dst_ops;
6264
1cf844c7 6265 net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true);
421842ed
DA		 6266 if (!net->ipv6.fib6_null_entry)
6267 goto out_ip6_dst_entries;
1cf844c7
DA		 6268 memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template,
6269 sizeof(*net->ipv6.fib6_null_entry));
421842ed 6270
8ed67789
DL		 6271 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
6272 sizeof(*net->ipv6.ip6_null_entry),
6273 GFP_KERNEL);
6274 if (!net->ipv6.ip6_null_entry)
421842ed 6275 goto out_fib6_null_entry;
d8d1f30b 6276 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 6277 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
6278 ip6_template_metrics, true);
74109218 6279 INIT_LIST_HEAD(&net->ipv6.ip6_null_entry->rt6i_uncached);
8ed67789
DL		 6280
6281#ifdef CONFIG_IPV6_MULTIPLE_TABLES
feca7d8c 6282 net->ipv6.fib6_has_custom_rules = false;
8ed67789
DL		 6283 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
6284 sizeof(*net->ipv6.ip6_prohibit_entry),
6285 GFP_KERNEL);
68fffc67
PZ		 6286 if (!net->ipv6.ip6_prohibit_entry)
6287 goto out_ip6_null_entry;
d8d1f30b 6288 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 6289 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
6290 ip6_template_metrics, true);
74109218 6291 INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->rt6i_uncached);
8ed67789
DL		 6292
6293 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
6294 sizeof(*net->ipv6.ip6_blk_hole_entry),
6295 GFP_KERNEL);
68fffc67
PZ		 6296 if (!net->ipv6.ip6_blk_hole_entry)
6297 goto out_ip6_prohibit_entry;
d8d1f30b 6298 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
62fa8a84
DM		 6299 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
6300 ip6_template_metrics, true);
74109218 6301 INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached);
b9b33e7c
PA		 6302#ifdef CONFIG_IPV6_SUBTREES
6303 net->ipv6.fib6_routes_require_src = 0;
6304#endif
8ed67789
DL		 6305#endif
6306
b339a47c
PZ		 6307 net->ipv6.sysctl.flush_delay = 0;
6308 net->ipv6.sysctl.ip6_rt_max_size = 4096;
6309 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
6310 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
6311 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
6312 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
6313 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
6314 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
7c6bb7d2 6315 net->ipv6.sysctl.skip_notify_on_dev_down = 0;
b339a47c 6316
6891a346
BT		 6317 net->ipv6.ip6_rt_gc_expire = 30*HZ;
6318
8ed67789
DL		 6319 ret = 0;
6320out:
6321 return ret;
f2fc6a54 6322
68fffc67
PZ		 6323#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6324out_ip6_prohibit_entry:
6325 kfree(net->ipv6.ip6_prohibit_entry);
6326out_ip6_null_entry:
6327 kfree(net->ipv6.ip6_null_entry);
6328#endif
421842ed
DA		 6329out_fib6_null_entry:
6330 kfree(net->ipv6.fib6_null_entry);
fc66f95c
ED		 6331out_ip6_dst_entries:
6332 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
f2fc6a54 6333out_ip6_dst_ops:
f2fc6a54 6334 goto out;
cdb18761
DL		 6335}
6336
2c8c1e72 6337static void __net_exit ip6_route_net_exit(struct net *net)
cdb18761 6338{
421842ed 6339 kfree(net->ipv6.fib6_null_entry);
8ed67789
DL		 6340 kfree(net->ipv6.ip6_null_entry);
6341#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6342 kfree(net->ipv6.ip6_prohibit_entry);
6343 kfree(net->ipv6.ip6_blk_hole_entry);
6344#endif
41bb78b4 6345 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
cdb18761
DL		 6346}
6347
d189634e
TG		 6348static int __net_init ip6_route_net_init_late(struct net *net)
6349{
6350#ifdef CONFIG_PROC_FS
c3506372
CH		 6351 proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops,
6352 sizeof(struct ipv6_route_iter));
3617d949
CH		 6353 proc_create_net_single("rt6_stats", 0444, net->proc_net,
6354 rt6_stats_seq_show, NULL);
d189634e
TG		 6355#endif
6356 return 0;
6357}
6358
6359static void __net_exit ip6_route_net_exit_late(struct net *net)
6360{
6361#ifdef CONFIG_PROC_FS
ece31ffd
G		 6362 remove_proc_entry("ipv6_route", net->proc_net);
6363 remove_proc_entry("rt6_stats", net->proc_net);
d189634e
TG		 6364#endif
6365}
6366
cdb18761
DL		 6367static struct pernet_operations ip6_route_net_ops = {
6368 .init = ip6_route_net_init,
6369 .exit = ip6_route_net_exit,
6370};
6371
c3426b47
DM		 6372static int __net_init ipv6_inetpeer_init(struct net *net)
6373{
6374 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
6375
6376 if (!bp)
6377 return -ENOMEM;
6378 inet_peer_base_init(bp);
6379 net->ipv6.peers = bp;
6380 return 0;
6381}
6382
6383static void __net_exit ipv6_inetpeer_exit(struct net *net)
6384{
6385 struct inet_peer_base *bp = net->ipv6.peers;
6386
6387 net->ipv6.peers = NULL;
56a6b248 6388 inetpeer_invalidate_tree(bp);
c3426b47
DM		 6389 kfree(bp);
6390}
6391
2b823f72 6392static struct pernet_operations ipv6_inetpeer_ops = {
c3426b47
DM		 6393 .init = ipv6_inetpeer_init,
6394 .exit = ipv6_inetpeer_exit,
6395};
6396
d189634e
TG		 6397static struct pernet_operations ip6_route_net_late_ops = {
6398 .init = ip6_route_net_init_late,
6399 .exit = ip6_route_net_exit_late,
6400};
6401
8ed67789
DL		 6402static struct notifier_block ip6_route_dev_notifier = {
6403 .notifier_call = ip6_route_dev_notify,
242d3a49 6404 .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
8ed67789
DL		 6405};
6406
2f460933
WC		 6407void __init ip6_route_init_special_entries(void)
6408{
6409 /* Registering of the loopback is done before this portion of code,
6410 * the loopback reference in rt6_info will not be taken, do it
6411 * manually for init_net */
1cf844c7 6412 init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev;
2f460933
WC		 6413 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
6414 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6415 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
6416 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
6417 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6418 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
6419 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6420 #endif
6421}
6422
138d0be3
YS		 6423#if IS_BUILTIN(CONFIG_IPV6)
6424#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6425DEFINE_BPF_ITER_FUNC(ipv6_route, struct bpf_iter_meta *meta, struct fib6_info *rt)
6426
951cf368
YS		 6427BTF_ID_LIST(btf_fib6_info_id)
6428BTF_ID(struct, fib6_info)
6429
6430static struct bpf_iter_reg ipv6_route_reg_info = {
15172a46
YS		 6431 .target = "ipv6_route",
6432 .seq_ops = &ipv6_route_seq_ops,
6433 .init_seq_private = bpf_iter_init_seq_net,
6434 .fini_seq_private = bpf_iter_fini_seq_net,
6435 .seq_priv_size = sizeof(struct ipv6_route_iter),
3c32cc1b
YS		 6436 .ctx_arg_info_size = 1,
6437 .ctx_arg_info = {
6438 { offsetof(struct bpf_iter__ipv6_route, rt),
6439 PTR_TO_BTF_ID_OR_NULL },
6440 },
15172a46
YS		 6441};
6442
138d0be3
YS		 6443static int __init bpf_iter_register(void)
6444{
951cf368 6445 ipv6_route_reg_info.ctx_arg_info[0].btf_id = *btf_fib6_info_id;
15172a46 6446 return bpf_iter_reg_target(&ipv6_route_reg_info);
138d0be3
YS		 6447}
6448
6449static void bpf_iter_unregister(void)
6450{
ab2ee4fc 6451 bpf_iter_unreg_target(&ipv6_route_reg_info);
138d0be3
YS		 6452}
6453#endif
6454#endif
6455
433d49c3 6456int __init ip6_route_init(void)
1da177e4 6457{
433d49c3 6458 int ret;
8d0b94af 6459 int cpu;
433d49c3 6460
9a7ec3a9
DL		 6461 ret = -ENOMEM;
6462 ip6_dst_ops_template.kmem_cachep =
e5d679f3 6463 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 6464 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 6465 if (!ip6_dst_ops_template.kmem_cachep)
c19a28e1 6466 goto out;
14e50e57 6467
fc66f95c 6468 ret = dst_entries_init(&ip6_dst_blackhole_ops);
8ed67789 6469 if (ret)
bdb3289f 6470 goto out_kmem_cache;
bdb3289f 6471
c3426b47
DM		 6472 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
6473 if (ret)
e8803b6c 6474 goto out_dst_entries;
2a0c451a 6475
7e52b33b
DM		 6476 ret = register_pernet_subsys(&ip6_route_net_ops);
6477 if (ret)
6478 goto out_register_inetpeer;
c3426b47 6479
5dc121e9
AE		 6480 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
6481
e8803b6c 6482 ret = fib6_init();
433d49c3 6483 if (ret)
8ed67789 6484 goto out_register_subsys;
433d49c3 6485
433d49c3
DL		 6486 ret = xfrm6_init();
6487 if (ret)
e8803b6c 6488 goto out_fib6_init;
c35b7e72 6489
433d49c3
DL		 6490 ret = fib6_rules_init();
6491 if (ret)
6492 goto xfrm6_init;
7e5449c2 6493
d189634e
TG		 6494 ret = register_pernet_subsys(&ip6_route_net_late_ops);
6495 if (ret)
6496 goto fib6_rules_init;
6497
16feebcf
FW		 6498 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE,
6499 inet6_rtm_newroute, NULL, 0);
6500 if (ret < 0)
6501 goto out_register_late_subsys;
6502
6503 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE,
6504 inet6_rtm_delroute, NULL, 0);
6505 if (ret < 0)
6506 goto out_register_late_subsys;
6507
6508 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE,
6509 inet6_rtm_getroute, NULL,
6510 RTNL_FLAG_DOIT_UNLOCKED);
6511 if (ret < 0)
d189634e 6512 goto out_register_late_subsys;
c127ea2c 6513
8ed67789 6514 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761 6515 if (ret)
d189634e 6516 goto out_register_late_subsys;
8ed67789 6517
138d0be3
YS		 6518#if IS_BUILTIN(CONFIG_IPV6)
6519#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6520 ret = bpf_iter_register();
6521 if (ret)
6522 goto out_register_late_subsys;
6523#endif
6524#endif
6525
8d0b94af
MKL		 6526 for_each_possible_cpu(cpu) {
6527 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
6528
6529 INIT_LIST_HEAD(&ul->head);
6530 spin_lock_init(&ul->lock);
6531 }
6532
433d49c3
DL		 6533out:
6534 return ret;
6535
d189634e 6536out_register_late_subsys:
16feebcf 6537 rtnl_unregister_all(PF_INET6);
d189634e 6538 unregister_pernet_subsys(&ip6_route_net_late_ops);
433d49c3 6539fib6_rules_init:
433d49c3
DL		 6540 fib6_rules_cleanup();
6541xfrm6_init:
433d49c3 6542 xfrm6_fini();
2a0c451a
TG		 6543out_fib6_init:
6544 fib6_gc_cleanup();
8ed67789
DL		 6545out_register_subsys:
6546 unregister_pernet_subsys(&ip6_route_net_ops);
7e52b33b
DM		 6547out_register_inetpeer:
6548 unregister_pernet_subsys(&ipv6_inetpeer_ops);
fc66f95c
ED		 6549out_dst_entries:
6550 dst_entries_destroy(&ip6_dst_blackhole_ops);
433d49c3 6551out_kmem_cache:
f2fc6a54 6552 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 6553 goto out;
1da177e4
LT		 6554}
6555
6556void ip6_route_cleanup(void)
6557{
138d0be3
YS		 6558#if IS_BUILTIN(CONFIG_IPV6)
6559#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6560 bpf_iter_unregister();
6561#endif
6562#endif
8ed67789 6563 unregister_netdevice_notifier(&ip6_route_dev_notifier);
d189634e 6564 unregister_pernet_subsys(&ip6_route_net_late_ops);
101367c2 6565 fib6_rules_cleanup();
1da177e4 6566 xfrm6_fini();
1da177e4 6567 fib6_gc_cleanup();
c3426b47 6568 unregister_pernet_subsys(&ipv6_inetpeer_ops);
8ed67789 6569 unregister_pernet_subsys(&ip6_route_net_ops);
41bb78b4 6570 dst_entries_destroy(&ip6_dst_blackhole_ops);
f2fc6a54 6571 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 6572}
Linux 6.x block layer and io_uring tree(s)