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[IPV6] SIT: Add PRL management for ISATAP.
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / route.c
CommitLineData
1da177e4
LT		 1/*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 *
8 * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16/* Changes:
17 *
18 * YOSHIFUJI Hideaki @USAGI
19 * reworked default router selection.
20 * - respect outgoing interface
21 * - select from (probably) reachable routers (i.e.
22 * routers in REACHABLE, STALE, DELAY or PROBE states).
23 * - always select the same router if it is (probably)
24 * reachable. otherwise, round-robin the list.
c0bece9f
YH		 25 * Ville Nuorvala
26 * Fixed routing subtrees.
1da177e4
LT		 27 */
28
4fc268d2 29#include <linux/capability.h>
1da177e4
LT		 30#include <linux/errno.h>
31#include <linux/types.h>
32#include <linux/times.h>
33#include <linux/socket.h>
34#include <linux/sockios.h>
35#include <linux/net.h>
36#include <linux/route.h>
37#include <linux/netdevice.h>
38#include <linux/in6.h>
39#include <linux/init.h>
1da177e4 40#include <linux/if_arp.h>
1da177e4
LT		 41#include <linux/proc_fs.h>
42#include <linux/seq_file.h>
5b7c931d 43#include <linux/nsproxy.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>
54#include <net/xfrm.h>
8d71740c 55#include <net/netevent.h>
21713ebc 56#include <net/netlink.h>
1da177e4
LT		 57
58#include <asm/uaccess.h>
59
60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
63
64/* Set to 3 to get tracing. */
65#define RT6_DEBUG 2
66
67#if RT6_DEBUG >= 3
68#define RDBG(x) printk x
69#define RT6_TRACE(x...) printk(KERN_DEBUG x)
70#else
71#define RDBG(x)
72#define RT6_TRACE(x...) do { ; } while (0)
73#endif
74
519fbd87 75#define CLONE_OFFLINK_ROUTE 0
1da177e4 76
1da177e4
LT		 77static struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
78static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
79static struct dst_entry *ip6_negative_advice(struct dst_entry *);
80static void ip6_dst_destroy(struct dst_entry *);
81static void ip6_dst_ifdown(struct dst_entry *,
82 struct net_device *dev, int how);
569d3645 83static int ip6_dst_gc(struct dst_ops *ops);
1da177e4
LT		 84
85static int ip6_pkt_discard(struct sk_buff *skb);
86static int ip6_pkt_discard_out(struct sk_buff *skb);
87static void ip6_link_failure(struct sk_buff *skb);
88static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
89
70ceb4f5 90#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0
DL		 91static struct rt6_info *rt6_add_route_info(struct net *net,
92 struct in6_addr *prefix, int prefixlen,
70ceb4f5
YH		 93 struct in6_addr *gwaddr, int ifindex,
94 unsigned pref);
efa2cea0
DL		 95static struct rt6_info *rt6_get_route_info(struct net *net,
96 struct in6_addr *prefix, int prefixlen,
70ceb4f5
YH		 97 struct in6_addr *gwaddr, int ifindex);
98#endif
99
9a7ec3a9 100static struct dst_ops ip6_dst_ops_template = {
1da177e4
LT		 101 .family = AF_INET6,
102 .protocol = __constant_htons(ETH_P_IPV6),
103 .gc = ip6_dst_gc,
104 .gc_thresh = 1024,
105 .check = ip6_dst_check,
106 .destroy = ip6_dst_destroy,
107 .ifdown = ip6_dst_ifdown,
108 .negative_advice = ip6_negative_advice,
109 .link_failure = ip6_link_failure,
110 .update_pmtu = ip6_rt_update_pmtu,
862b82c6 111 .local_out = ip6_local_out,
1da177e4 112 .entry_size = sizeof(struct rt6_info),
e2422970 113 .entries = ATOMIC_INIT(0),
1da177e4
LT		 114};
115
14e50e57
DM		 116static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
117{
118}
119
120static struct dst_ops ip6_dst_blackhole_ops = {
121 .family = AF_INET6,
122 .protocol = __constant_htons(ETH_P_IPV6),
123 .destroy = ip6_dst_destroy,
124 .check = ip6_dst_check,
125 .update_pmtu = ip6_rt_blackhole_update_pmtu,
126 .entry_size = sizeof(struct rt6_info),
e2422970 127 .entries = ATOMIC_INIT(0),
14e50e57
DM		 128};
129
bdb3289f 130static struct rt6_info ip6_null_entry_template = {
1da177e4
LT		 131 .u = {
132 .dst = {
133 .__refcnt = ATOMIC_INIT(1),
134 .__use = 1,
1da177e4
LT		 135 .obsolete = -1,
136 .error = -ENETUNREACH,
137 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
138 .input = ip6_pkt_discard,
139 .output = ip6_pkt_discard_out,
1da177e4
LT		 140 }
141 },
142 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
143 .rt6i_metric = ~(u32) 0,
144 .rt6i_ref = ATOMIC_INIT(1),
145};
146
101367c2
TG		 147#ifdef CONFIG_IPV6_MULTIPLE_TABLES
148
6723ab54
DM		 149static int ip6_pkt_prohibit(struct sk_buff *skb);
150static int ip6_pkt_prohibit_out(struct sk_buff *skb);
6723ab54 151
bdb3289f 152struct rt6_info ip6_prohibit_entry_template = {
101367c2
TG		 153 .u = {
154 .dst = {
155 .__refcnt = ATOMIC_INIT(1),
156 .__use = 1,
101367c2
TG		 157 .obsolete = -1,
158 .error = -EACCES,
159 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
9ce8ade0
TG		 160 .input = ip6_pkt_prohibit,
161 .output = ip6_pkt_prohibit_out,
101367c2
TG		 162 }
163 },
164 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
165 .rt6i_metric = ~(u32) 0,
166 .rt6i_ref = ATOMIC_INIT(1),
167};
168
bdb3289f 169static struct rt6_info ip6_blk_hole_entry_template = {
101367c2
TG		 170 .u = {
171 .dst = {
172 .__refcnt = ATOMIC_INIT(1),
173 .__use = 1,
101367c2
TG		 174 .obsolete = -1,
175 .error = -EINVAL,
176 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
352e512c
HX		 177 .input = dst_discard,
178 .output = dst_discard,
101367c2
TG		 179 }
180 },
181 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
182 .rt6i_metric = ~(u32) 0,
183 .rt6i_ref = ATOMIC_INIT(1),
184};
185
186#endif
187
1da177e4 188/* allocate dst with ip6_dst_ops */
f2fc6a54 189static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops)
1da177e4 190{
f2fc6a54 191 return (struct rt6_info *)dst_alloc(ops);
1da177e4
LT		 192}
193
194static void ip6_dst_destroy(struct dst_entry *dst)
195{
196 struct rt6_info *rt = (struct rt6_info *)dst;
197 struct inet6_dev *idev = rt->rt6i_idev;
198
199 if (idev != NULL) {
200 rt->rt6i_idev = NULL;
201 in6_dev_put(idev);
1ab1457c 202 }
1da177e4
LT		 203}
204
205static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
206 int how)
207{
208 struct rt6_info *rt = (struct rt6_info *)dst;
209 struct inet6_dev *idev = rt->rt6i_idev;
5a3e55d6 210 struct net_device *loopback_dev =
c346dca1 211 dev_net(dev)->loopback_dev;
1da177e4 212
5a3e55d6
DL		 213 if (dev != loopback_dev && idev != NULL && idev->dev == dev) {
214 struct inet6_dev *loopback_idev =
215 in6_dev_get(loopback_dev);
1da177e4
LT		 216 if (loopback_idev != NULL) {
217 rt->rt6i_idev = loopback_idev;
218 in6_dev_put(idev);
219 }
220 }
221}
222
223static __inline__ int rt6_check_expired(const struct rt6_info *rt)
224{
225 return (rt->rt6i_flags & RTF_EXPIRES &&
226 time_after(jiffies, rt->rt6i_expires));
227}
228
c71099ac
TG		 229static inline int rt6_need_strict(struct in6_addr *daddr)
230{
231 return (ipv6_addr_type(daddr) &
232 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
233}
234
1da177e4 235/*
c71099ac 236 * Route lookup. Any table->tb6_lock is implied.
1da177e4
LT		 237 */
238
8ed67789
DL		 239static inline struct rt6_info *rt6_device_match(struct net *net,
240 struct rt6_info *rt,
1da177e4
LT		 241 int oif,
242 int strict)
243{
244 struct rt6_info *local = NULL;
245 struct rt6_info *sprt;
246
247 if (oif) {
7cc48263 248 for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) {
1da177e4
LT		 249 struct net_device *dev = sprt->rt6i_dev;
250 if (dev->ifindex == oif)
251 return sprt;
252 if (dev->flags & IFF_LOOPBACK) {
253 if (sprt->rt6i_idev == NULL ||
254 sprt->rt6i_idev->dev->ifindex != oif) {
255 if (strict && oif)
256 continue;
1ab1457c 257 if (local && (!oif ||
1da177e4
LT		 258 local->rt6i_idev->dev->ifindex == oif))
259 continue;
260 }
261 local = sprt;
262 }
263 }
264
265 if (local)
266 return local;
267
268 if (strict)
8ed67789 269 return net->ipv6.ip6_null_entry;
1da177e4
LT		 270 }
271 return rt;
272}
273
27097255
YH		 274#ifdef CONFIG_IPV6_ROUTER_PREF
275static void rt6_probe(struct rt6_info *rt)
276{
277 struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL;
278 /*
279 * Okay, this does not seem to be appropriate
280 * for now, however, we need to check if it
281 * is really so; aka Router Reachability Probing.
282 *
283 * Router Reachability Probe MUST be rate-limited
284 * to no more than one per minute.
285 */
286 if (!neigh || (neigh->nud_state & NUD_VALID))
287 return;
288 read_lock_bh(&neigh->lock);
289 if (!(neigh->nud_state & NUD_VALID) &&
52e16356 290 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
27097255
YH		 291 struct in6_addr mcaddr;
292 struct in6_addr *target;
293
294 neigh->updated = jiffies;
295 read_unlock_bh(&neigh->lock);
296
297 target = (struct in6_addr *)&neigh->primary_key;
298 addrconf_addr_solict_mult(target, &mcaddr);
299 ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL);
300 } else
301 read_unlock_bh(&neigh->lock);
302}
303#else
304static inline void rt6_probe(struct rt6_info *rt)
305{
306 return;
307}
308#endif
309
1da177e4 310/*
554cfb7e 311 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 312 */
b6f99a21 313static inline int rt6_check_dev(struct rt6_info *rt, int oif)
554cfb7e
YH		 314{
315 struct net_device *dev = rt->rt6i_dev;
161980f4 316 if (!oif || dev->ifindex == oif)
554cfb7e 317 return 2;
161980f4
DM		 318 if ((dev->flags & IFF_LOOPBACK) &&
319 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
320 return 1;
321 return 0;
554cfb7e 322}
1da177e4 323
b6f99a21 324static inline int rt6_check_neigh(struct rt6_info *rt)
1da177e4 325{
554cfb7e 326 struct neighbour *neigh = rt->rt6i_nexthop;
398bcbeb 327 int m;
4d0c5911
YH		 328 if (rt->rt6i_flags & RTF_NONEXTHOP ||
329 !(rt->rt6i_flags & RTF_GATEWAY))
330 m = 1;
331 else if (neigh) {
554cfb7e
YH		 332 read_lock_bh(&neigh->lock);
333 if (neigh->nud_state & NUD_VALID)
4d0c5911 334 m = 2;
398bcbeb
YH		 335#ifdef CONFIG_IPV6_ROUTER_PREF
336 else if (neigh->nud_state & NUD_FAILED)
337 m = 0;
338#endif
339 else
ea73ee23 340 m = 1;
554cfb7e 341 read_unlock_bh(&neigh->lock);
398bcbeb
YH		 342 } else
343 m = 0;
554cfb7e 344 return m;
1da177e4
LT		 345}
346
554cfb7e
YH		 347static int rt6_score_route(struct rt6_info *rt, int oif,
348 int strict)
1da177e4 349{
4d0c5911 350 int m, n;
1ab1457c 351
4d0c5911 352 m = rt6_check_dev(rt, oif);
77d16f45 353 if (!m && (strict & RT6_LOOKUP_F_IFACE))
554cfb7e 354 return -1;
ebacaaa0
YH		 355#ifdef CONFIG_IPV6_ROUTER_PREF
356 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
357#endif
4d0c5911 358 n = rt6_check_neigh(rt);
557e92ef 359 if (!n && (strict & RT6_LOOKUP_F_REACHABLE))
554cfb7e
YH		 360 return -1;
361 return m;
362}
363
f11e6659
DM		 364static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
365 int *mpri, struct rt6_info *match)
554cfb7e 366{
f11e6659
DM		 367 int m;
368
369 if (rt6_check_expired(rt))
370 goto out;
371
372 m = rt6_score_route(rt, oif, strict);
373 if (m < 0)
374 goto out;
375
376 if (m > *mpri) {
377 if (strict & RT6_LOOKUP_F_REACHABLE)
378 rt6_probe(match);
379 *mpri = m;
380 match = rt;
381 } else if (strict & RT6_LOOKUP_F_REACHABLE) {
382 rt6_probe(rt);
383 }
384
385out:
386 return match;
387}
388
389static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
390 struct rt6_info *rr_head,
391 u32 metric, int oif, int strict)
392{
393 struct rt6_info *rt, *match;
554cfb7e 394 int mpri = -1;
1da177e4 395
f11e6659
DM		 396 match = NULL;
397 for (rt = rr_head; rt && rt->rt6i_metric == metric;
398 rt = rt->u.dst.rt6_next)
399 match = find_match(rt, oif, strict, &mpri, match);
400 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
401 rt = rt->u.dst.rt6_next)
402 match = find_match(rt, oif, strict, &mpri, match);
1da177e4 403
f11e6659
DM		 404 return match;
405}
1da177e4 406
f11e6659
DM		 407static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
408{
409 struct rt6_info *match, *rt0;
8ed67789 410 struct net *net;
1da177e4 411
f11e6659 412 RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n",
0dc47877 413 __func__, fn->leaf, oif);
554cfb7e 414
f11e6659
DM		 415 rt0 = fn->rr_ptr;
416 if (!rt0)
417 fn->rr_ptr = rt0 = fn->leaf;
1da177e4 418
f11e6659 419 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict);
1da177e4 420
554cfb7e 421 if (!match &&
f11e6659
DM		 422 (strict & RT6_LOOKUP_F_REACHABLE)) {
423 struct rt6_info *next = rt0->u.dst.rt6_next;
424
554cfb7e 425 /* no entries matched; do round-robin */
f11e6659
DM		 426 if (!next || next->rt6i_metric != rt0->rt6i_metric)
427 next = fn->leaf;
428
429 if (next != rt0)
430 fn->rr_ptr = next;
1da177e4 431 }
1da177e4 432
f11e6659 433 RT6_TRACE("%s() => %p\n",
0dc47877 434 __func__, match);
1da177e4 435
c346dca1 436 net = dev_net(rt0->rt6i_dev);
8ed67789 437 return (match ? match : net->ipv6.ip6_null_entry);
1da177e4
LT		 438}
439
70ceb4f5
YH		 440#ifdef CONFIG_IPV6_ROUTE_INFO
441int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
442 struct in6_addr *gwaddr)
443{
c346dca1 444 struct net *net = dev_net(dev);
70ceb4f5
YH		 445 struct route_info *rinfo = (struct route_info *) opt;
446 struct in6_addr prefix_buf, *prefix;
447 unsigned int pref;
448 u32 lifetime;
449 struct rt6_info *rt;
450
451 if (len < sizeof(struct route_info)) {
452 return -EINVAL;
453 }
454
455 /* Sanity check for prefix_len and length */
456 if (rinfo->length > 3) {
457 return -EINVAL;
458 } else if (rinfo->prefix_len > 128) {
459 return -EINVAL;
460 } else if (rinfo->prefix_len > 64) {
461 if (rinfo->length < 2) {
462 return -EINVAL;
463 }
464 } else if (rinfo->prefix_len > 0) {
465 if (rinfo->length < 1) {
466 return -EINVAL;
467 }
468 }
469
470 pref = rinfo->route_pref;
471 if (pref == ICMPV6_ROUTER_PREF_INVALID)
472 pref = ICMPV6_ROUTER_PREF_MEDIUM;
473
e69a4adc 474 lifetime = ntohl(rinfo->lifetime);
70ceb4f5
YH		 475 if (lifetime == 0xffffffff) {
476 /* infinity */
477 } else if (lifetime > 0x7fffffff/HZ) {
478 /* Avoid arithmetic overflow */
479 lifetime = 0x7fffffff/HZ - 1;
480 }
481
482 if (rinfo->length == 3)
483 prefix = (struct in6_addr *)rinfo->prefix;
484 else {
485 /* this function is safe */
486 ipv6_addr_prefix(&prefix_buf,
487 (struct in6_addr *)rinfo->prefix,
488 rinfo->prefix_len);
489 prefix = &prefix_buf;
490 }
491
efa2cea0
DL		 492 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
493 dev->ifindex);
70ceb4f5
YH		 494
495 if (rt && !lifetime) {
e0a1ad73 496 ip6_del_rt(rt);
70ceb4f5
YH		 497 rt = NULL;
498 }
499
500 if (!rt && lifetime)
efa2cea0 501 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
70ceb4f5
YH		 502 pref);
503 else if (rt)
504 rt->rt6i_flags = RTF_ROUTEINFO |
505 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
506
507 if (rt) {
508 if (lifetime == 0xffffffff) {
509 rt->rt6i_flags &= ~RTF_EXPIRES;
510 } else {
511 rt->rt6i_expires = jiffies + HZ * lifetime;
512 rt->rt6i_flags |= RTF_EXPIRES;
513 }
514 dst_release(&rt->u.dst);
515 }
516 return 0;
517}
518#endif
519
8ed67789 520#define BACKTRACK(__net, saddr) \
982f56f3 521do { \
8ed67789 522 if (rt == __net->ipv6.ip6_null_entry) { \
982f56f3 523 struct fib6_node *pn; \
e0eda7bb 524 while (1) { \
982f56f3
YH		 525 if (fn->fn_flags & RTN_TL_ROOT) \
526 goto out; \
527 pn = fn->parent; \
528 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
8bce65b9 529 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
982f56f3
YH		 530 else \
531 fn = pn; \
532 if (fn->fn_flags & RTN_RTINFO) \
533 goto restart; \
c71099ac 534 } \
c71099ac 535 } \
982f56f3 536} while(0)
c71099ac 537
8ed67789
DL		 538static struct rt6_info *ip6_pol_route_lookup(struct net *net,
539 struct fib6_table *table,
c71099ac 540 struct flowi *fl, int flags)
1da177e4
LT		 541{
542 struct fib6_node *fn;
543 struct rt6_info *rt;
544
c71099ac
TG		 545 read_lock_bh(&table->tb6_lock);
546 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
547restart:
548 rt = fn->leaf;
8ed67789
DL		 549 rt = rt6_device_match(net, rt, fl->oif, flags);
550 BACKTRACK(net, &fl->fl6_src);
c71099ac 551out:
03f49f34 552 dst_use(&rt->u.dst, jiffies);
c71099ac 553 read_unlock_bh(&table->tb6_lock);
c71099ac
TG		 554 return rt;
555
556}
557
606a2b48
DL		 558struct rt6_info *rt6_lookup(struct net *net, struct in6_addr *daddr,
559 struct in6_addr *saddr, int oif, int strict)
c71099ac
TG		 560{
561 struct flowi fl = {
562 .oif = oif,
563 .nl_u = {
564 .ip6_u = {
565 .daddr = *daddr,
c71099ac
TG		 566 },
567 },
568 };
569 struct dst_entry *dst;
77d16f45 570 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
c71099ac 571
adaa70bb
TG		 572 if (saddr) {
573 memcpy(&fl.fl6_src, saddr, sizeof(*saddr));
574 flags |= RT6_LOOKUP_F_HAS_SADDR;
575 }
576
606a2b48 577 dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup);
c71099ac
TG		 578 if (dst->error == 0)
579 return (struct rt6_info *) dst;
580
581 dst_release(dst);
582
1da177e4
LT		 583 return NULL;
584}
585
7159039a
YH		 586EXPORT_SYMBOL(rt6_lookup);
587
c71099ac 588/* ip6_ins_rt is called with FREE table->tb6_lock.
1da177e4
LT		 589 It takes new route entry, the addition fails by any reason the
590 route is freed. In any case, if caller does not hold it, it may
591 be destroyed.
592 */
593
86872cb5 594static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 595{
596 int err;
c71099ac 597 struct fib6_table *table;
1da177e4 598
c71099ac
TG		 599 table = rt->rt6i_table;
600 write_lock_bh(&table->tb6_lock);
86872cb5 601 err = fib6_add(&table->tb6_root, rt, info);
c71099ac 602 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 603
604 return err;
605}
606
40e22e8f
TG		 607int ip6_ins_rt(struct rt6_info *rt)
608{
4d1169c1 609 struct nl_info info = {
c346dca1 610 .nl_net = dev_net(rt->rt6i_dev),
4d1169c1 611 };
528c4ceb 612 return __ip6_ins_rt(rt, &info);
40e22e8f
TG		 613}
614
95a9a5ba
YH		 615static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
616 struct in6_addr *saddr)
1da177e4 617{
1da177e4
LT		 618 struct rt6_info *rt;
619
620 /*
621 * Clone the route.
622 */
623
624 rt = ip6_rt_copy(ort);
625
626 if (rt) {
58c4fb86
YH		 627 if (!(rt->rt6i_flags&RTF_GATEWAY)) {
628 if (rt->rt6i_dst.plen != 128 &&
629 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr))
630 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 631 ipv6_addr_copy(&rt->rt6i_gateway, daddr);
58c4fb86 632 }
1da177e4 633
58c4fb86 634 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
1da177e4
LT		 635 rt->rt6i_dst.plen = 128;
636 rt->rt6i_flags |= RTF_CACHE;
637 rt->u.dst.flags |= DST_HOST;
638
639#ifdef CONFIG_IPV6_SUBTREES
640 if (rt->rt6i_src.plen && saddr) {
641 ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
642 rt->rt6i_src.plen = 128;
643 }
644#endif
645
646 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
647
95a9a5ba 648 }
1da177e4 649
95a9a5ba
YH		 650 return rt;
651}
1da177e4 652
299d9939
YH		 653static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr)
654{
655 struct rt6_info *rt = ip6_rt_copy(ort);
656 if (rt) {
657 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
658 rt->rt6i_dst.plen = 128;
659 rt->rt6i_flags |= RTF_CACHE;
299d9939
YH		 660 rt->u.dst.flags |= DST_HOST;
661 rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
662 }
663 return rt;
664}
665
8ed67789
DL		 666static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
667 struct flowi *fl, int flags)
1da177e4
LT		 668{
669 struct fib6_node *fn;
519fbd87 670 struct rt6_info *rt, *nrt;
c71099ac 671 int strict = 0;
1da177e4 672 int attempts = 3;
519fbd87 673 int err;
ea659e07 674 int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
1da177e4 675
77d16f45 676 strict |= flags & RT6_LOOKUP_F_IFACE;
1da177e4
LT		 677
678relookup:
c71099ac 679 read_lock_bh(&table->tb6_lock);
1da177e4 680
8238dd06 681restart_2:
c71099ac 682 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1da177e4
LT		 683
684restart:
4acad72d 685 rt = rt6_select(fn, oif, strict | reachable);
8ed67789
DL		 686
687 BACKTRACK(net, &fl->fl6_src);
688 if (rt == net->ipv6.ip6_null_entry ||
8238dd06 689 rt->rt6i_flags & RTF_CACHE)
1ddef044 690 goto out;
1da177e4 691
fb9de91e 692 dst_hold(&rt->u.dst);
c71099ac 693 read_unlock_bh(&table->tb6_lock);
fb9de91e 694
519fbd87 695 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
c71099ac 696 nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
519fbd87
YH		 697 else {
698#if CLONE_OFFLINK_ROUTE
c71099ac 699 nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
519fbd87
YH		 700#else
701 goto out2;
702#endif
703 }
e40cf353 704
519fbd87 705 dst_release(&rt->u.dst);
8ed67789 706 rt = nrt ? : net->ipv6.ip6_null_entry;
1da177e4 707
519fbd87
YH		 708 dst_hold(&rt->u.dst);
709 if (nrt) {
40e22e8f 710 err = ip6_ins_rt(nrt);
519fbd87 711 if (!err)
1da177e4 712 goto out2;
1da177e4 713 }
1da177e4 714
519fbd87
YH		 715 if (--attempts <= 0)
716 goto out2;
717
718 /*
c71099ac 719 * Race condition! In the gap, when table->tb6_lock was
519fbd87
YH		 720 * released someone could insert this route. Relookup.
721 */
722 dst_release(&rt->u.dst);
723 goto relookup;
724
725out:
8238dd06
YH		 726 if (reachable) {
727 reachable = 0;
728 goto restart_2;
729 }
519fbd87 730 dst_hold(&rt->u.dst);
c71099ac 731 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 732out2:
733 rt->u.dst.lastuse = jiffies;
734 rt->u.dst.__use++;
c71099ac
TG		 735
736 return rt;
1da177e4
LT		 737}
738
8ed67789 739static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
4acad72d
PE		 740 struct flowi *fl, int flags)
741{
8ed67789 742 return ip6_pol_route(net, table, fl->iif, fl, flags);
4acad72d
PE		 743}
744
c71099ac
TG		 745void ip6_route_input(struct sk_buff *skb)
746{
0660e03f 747 struct ipv6hdr *iph = ipv6_hdr(skb);
c346dca1 748 struct net *net = dev_net(skb->dev);
adaa70bb 749 int flags = RT6_LOOKUP_F_HAS_SADDR;
c71099ac
TG		 750 struct flowi fl = {
751 .iif = skb->dev->ifindex,
752 .nl_u = {
753 .ip6_u = {
754 .daddr = iph->daddr,
755 .saddr = iph->saddr,
90bcaf7b 756 .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK,
c71099ac
TG		 757 },
758 },
1ab1457c 759 .mark = skb->mark,
c71099ac
TG		 760 .proto = iph->nexthdr,
761 };
adaa70bb
TG		 762
763 if (rt6_need_strict(&iph->daddr))
764 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 765
5578689a 766 skb->dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input);
c71099ac
TG		 767}
768
8ed67789 769static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
c71099ac 770 struct flowi *fl, int flags)
1da177e4 771{
8ed67789 772 return ip6_pol_route(net, table, fl->oif, fl, flags);
c71099ac
TG		 773}
774
4591db4f
DL		 775struct dst_entry * ip6_route_output(struct net *net, struct sock *sk,
776 struct flowi *fl)
c71099ac
TG		 777{
778 int flags = 0;
779
780 if (rt6_need_strict(&fl->fl6_dst))
77d16f45 781 flags |= RT6_LOOKUP_F_IFACE;
c71099ac 782
adaa70bb
TG		 783 if (!ipv6_addr_any(&fl->fl6_src))
784 flags |= RT6_LOOKUP_F_HAS_SADDR;
7cbca67c
YH		 785 else if (sk) {
786 unsigned int prefs = inet6_sk(sk)->srcprefs;
787 if (prefs & IPV6_PREFER_SRC_TMP)
788 flags |= RT6_LOOKUP_F_SRCPREF_TMP;
789 if (prefs & IPV6_PREFER_SRC_PUBLIC)
790 flags |= RT6_LOOKUP_F_SRCPREF_PUBLIC;
791 if (prefs & IPV6_PREFER_SRC_COA)
792 flags |= RT6_LOOKUP_F_SRCPREF_COA;
793 }
adaa70bb 794
4591db4f 795 return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output);
1da177e4
LT		 796}
797
7159039a 798EXPORT_SYMBOL(ip6_route_output);
1da177e4 799
14e50e57
DM		 800int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl)
801{
802 struct rt6_info *ort = (struct rt6_info *) *dstp;
803 struct rt6_info *rt = (struct rt6_info *)
804 dst_alloc(&ip6_dst_blackhole_ops);
805 struct dst_entry *new = NULL;
806
807 if (rt) {
808 new = &rt->u.dst;
809
810 atomic_set(&new->__refcnt, 1);
811 new->__use = 1;
352e512c
HX		 812 new->input = dst_discard;
813 new->output = dst_discard;
14e50e57
DM		 814
815 memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
816 new->dev = ort->u.dst.dev;
817 if (new->dev)
818 dev_hold(new->dev);
819 rt->rt6i_idev = ort->rt6i_idev;
820 if (rt->rt6i_idev)
821 in6_dev_hold(rt->rt6i_idev);
822 rt->rt6i_expires = 0;
823
824 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
825 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
826 rt->rt6i_metric = 0;
827
828 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
829#ifdef CONFIG_IPV6_SUBTREES
830 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
831#endif
832
833 dst_free(new);
834 }
835
836 dst_release(*dstp);
837 *dstp = new;
838 return (new ? 0 : -ENOMEM);
839}
840EXPORT_SYMBOL_GPL(ip6_dst_blackhole);
841
1da177e4
LT		 842/*
843 * Destination cache support functions
844 */
845
846static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
847{
848 struct rt6_info *rt;
849
850 rt = (struct rt6_info *) dst;
851
852 if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
853 return dst;
854
855 return NULL;
856}
857
858static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
859{
860 struct rt6_info *rt = (struct rt6_info *) dst;
861
862 if (rt) {
863 if (rt->rt6i_flags & RTF_CACHE)
e0a1ad73 864 ip6_del_rt(rt);
1da177e4
LT		 865 else
866 dst_release(dst);
867 }
868 return NULL;
869}
870
871static void ip6_link_failure(struct sk_buff *skb)
872{
873 struct rt6_info *rt;
874
875 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
876
877 rt = (struct rt6_info *) skb->dst;
878 if (rt) {
879 if (rt->rt6i_flags&RTF_CACHE) {
880 dst_set_expires(&rt->u.dst, 0);
881 rt->rt6i_flags |= RTF_EXPIRES;
882 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
883 rt->rt6i_node->fn_sernum = -1;
884 }
885}
886
887static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
888{
889 struct rt6_info *rt6 = (struct rt6_info*)dst;
890
891 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
892 rt6->rt6i_flags |= RTF_MODIFIED;
893 if (mtu < IPV6_MIN_MTU) {
894 mtu = IPV6_MIN_MTU;
895 dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
896 }
897 dst->metrics[RTAX_MTU-1] = mtu;
8d71740c 898 call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
1da177e4
LT		 899 }
900}
901
1da177e4
LT		 902static int ipv6_get_mtu(struct net_device *dev);
903
5578689a 904static inline unsigned int ipv6_advmss(struct net *net, unsigned int mtu)
1da177e4
LT		 905{
906 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
907
5578689a
DL		 908 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
909 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1da177e4
LT		 910
911 /*
1ab1457c
YH		 912 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
913 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
914 * IPV6_MAXPLEN is also valid and means: "any MSS,
1da177e4
LT		 915 * rely only on pmtu discovery"
916 */
917 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
918 mtu = IPV6_MAXPLEN;
919 return mtu;
920}
921
3b00944c
YH		 922static struct dst_entry *icmp6_dst_gc_list;
923static DEFINE_SPINLOCK(icmp6_dst_lock);
5d0bbeeb 924
3b00944c 925struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1da177e4 926 struct neighbour *neigh,
3b00944c 927 struct in6_addr *addr)
1da177e4
LT		 928{
929 struct rt6_info *rt;
930 struct inet6_dev *idev = in6_dev_get(dev);
c346dca1 931 struct net *net = dev_net(dev);
1da177e4
LT		 932
933 if (unlikely(idev == NULL))
934 return NULL;
935
f2fc6a54 936 rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
1da177e4
LT		 937 if (unlikely(rt == NULL)) {
938 in6_dev_put(idev);
939 goto out;
940 }
941
942 dev_hold(dev);
943 if (neigh)
944 neigh_hold(neigh);
945 else
946 neigh = ndisc_get_neigh(dev, addr);
947
948 rt->rt6i_dev = dev;
949 rt->rt6i_idev = idev;
950 rt->rt6i_nexthop = neigh;
951 atomic_set(&rt->u.dst.__refcnt, 1);
952 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
953 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
5578689a 954 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
3b00944c 955 rt->u.dst.output = ip6_output;
1da177e4
LT		 956
957#if 0 /* there's no chance to use these for ndisc */
1ab1457c
YH		 958 rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
959 ? DST_HOST
1da177e4
LT		 960 : 0;
961 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
962 rt->rt6i_dst.plen = 128;
963#endif
964
3b00944c
YH		 965 spin_lock_bh(&icmp6_dst_lock);
966 rt->u.dst.next = icmp6_dst_gc_list;
967 icmp6_dst_gc_list = &rt->u.dst;
968 spin_unlock_bh(&icmp6_dst_lock);
1da177e4 969
5578689a 970 fib6_force_start_gc(net);
1da177e4
LT		 971
972out:
40aa7b90 973 return &rt->u.dst;
1da177e4
LT		 974}
975
3b00944c 976int icmp6_dst_gc(int *more)
1da177e4
LT		 977{
978 struct dst_entry *dst, *next, **pprev;
979 int freed;
980
981 next = NULL;
1ab1457c 982 freed = 0;
5d0bbeeb 983
3b00944c
YH		 984 spin_lock_bh(&icmp6_dst_lock);
985 pprev = &icmp6_dst_gc_list;
5d0bbeeb 986
1da177e4
LT		 987 while ((dst = *pprev) != NULL) {
988 if (!atomic_read(&dst->__refcnt)) {
989 *pprev = dst->next;
990 dst_free(dst);
991 freed++;
992 } else {
993 pprev = &dst->next;
994 (*more)++;
995 }
996 }
997
3b00944c 998 spin_unlock_bh(&icmp6_dst_lock);
5d0bbeeb 999
1da177e4
LT		 1000 return freed;
1001}
1002
569d3645 1003static int ip6_dst_gc(struct dst_ops *ops)
1da177e4 1004{
1da177e4 1005 unsigned long now = jiffies;
7019b78e
DL		 1006 struct net *net = ops->dst_net;
1007 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1008 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1009 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1010 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1011 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1012
1013 if (time_after(rt_last_gc + rt_min_interval, now) &&
1014 atomic_read(&ops->entries) <= rt_max_size)
1da177e4
LT		 1015 goto out;
1016
6891a346
BT		 1017 net->ipv6.ip6_rt_gc_expire++;
1018 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net);
1019 net->ipv6.ip6_rt_last_gc = now;
7019b78e
DL		 1020 if (atomic_read(&ops->entries) < ops->gc_thresh)
1021 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1da177e4 1022out:
7019b78e
DL		 1023 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1024 return (atomic_read(&ops->entries) > rt_max_size);
1da177e4
LT		 1025}
1026
1027/* Clean host part of a prefix. Not necessary in radix tree,
1028 but results in cleaner routing tables.
1029
1030 Remove it only when all the things will work!
1031 */
1032
1033static int ipv6_get_mtu(struct net_device *dev)
1034{
1035 int mtu = IPV6_MIN_MTU;
1036 struct inet6_dev *idev;
1037
1038 idev = in6_dev_get(dev);
1039 if (idev) {
1040 mtu = idev->cnf.mtu6;
1041 in6_dev_put(idev);
1042 }
1043 return mtu;
1044}
1045
6b75d090 1046int ip6_dst_hoplimit(struct dst_entry *dst)
1da177e4 1047{
6b75d090
YH		 1048 int hoplimit = dst_metric(dst, RTAX_HOPLIMIT);
1049 if (hoplimit < 0) {
1050 struct net_device *dev = dst->dev;
1051 struct inet6_dev *idev = in6_dev_get(dev);
1052 if (idev) {
1053 hoplimit = idev->cnf.hop_limit;
1054 in6_dev_put(idev);
1055 } else
1056 hoplimit = ipv6_devconf.hop_limit;
1da177e4
LT		 1057 }
1058 return hoplimit;
1059}
1060
1061/*
1062 *
1063 */
1064
86872cb5 1065int ip6_route_add(struct fib6_config *cfg)
1da177e4
LT		 1066{
1067 int err;
5578689a 1068 struct net *net = cfg->fc_nlinfo.nl_net;
1da177e4
LT		 1069 struct rt6_info *rt = NULL;
1070 struct net_device *dev = NULL;
1071 struct inet6_dev *idev = NULL;
c71099ac 1072 struct fib6_table *table;
1da177e4
LT		 1073 int addr_type;
1074
86872cb5 1075 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1da177e4
LT		 1076 return -EINVAL;
1077#ifndef CONFIG_IPV6_SUBTREES
86872cb5 1078 if (cfg->fc_src_len)
1da177e4
LT		 1079 return -EINVAL;
1080#endif
86872cb5 1081 if (cfg->fc_ifindex) {
1da177e4 1082 err = -ENODEV;
5578689a 1083 dev = dev_get_by_index(net, cfg->fc_ifindex);
1da177e4
LT		 1084 if (!dev)
1085 goto out;
1086 idev = in6_dev_get(dev);
1087 if (!idev)
1088 goto out;
1089 }
1090
86872cb5
TG		 1091 if (cfg->fc_metric == 0)
1092 cfg->fc_metric = IP6_RT_PRIO_USER;
1da177e4 1093
5578689a 1094 table = fib6_new_table(net, cfg->fc_table);
c71099ac
TG		 1095 if (table == NULL) {
1096 err = -ENOBUFS;
1097 goto out;
1098 }
1099
f2fc6a54 1100 rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
1da177e4
LT		 1101
1102 if (rt == NULL) {
1103 err = -ENOMEM;
1104 goto out;
1105 }
1106
1107 rt->u.dst.obsolete = -1;
86872cb5 1108 rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires);
1da177e4 1109
86872cb5
TG		 1110 if (cfg->fc_protocol == RTPROT_UNSPEC)
1111 cfg->fc_protocol = RTPROT_BOOT;
1112 rt->rt6i_protocol = cfg->fc_protocol;
1113
1114 addr_type = ipv6_addr_type(&cfg->fc_dst);
1da177e4
LT		 1115
1116 if (addr_type & IPV6_ADDR_MULTICAST)
1117 rt->u.dst.input = ip6_mc_input;
1118 else
1119 rt->u.dst.input = ip6_forward;
1120
1121 rt->u.dst.output = ip6_output;
1122
86872cb5
TG		 1123 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1124 rt->rt6i_dst.plen = cfg->fc_dst_len;
1da177e4
LT		 1125 if (rt->rt6i_dst.plen == 128)
1126 rt->u.dst.flags = DST_HOST;
1127
1128#ifdef CONFIG_IPV6_SUBTREES
86872cb5
TG		 1129 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1130 rt->rt6i_src.plen = cfg->fc_src_len;
1da177e4
LT		 1131#endif
1132
86872cb5 1133 rt->rt6i_metric = cfg->fc_metric;
1da177e4
LT		 1134
1135 /* We cannot add true routes via loopback here,
1136 they would result in kernel looping; promote them to reject routes
1137 */
86872cb5 1138 if ((cfg->fc_flags & RTF_REJECT) ||
1da177e4
LT		 1139 (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
1140 /* hold loopback dev/idev if we haven't done so. */
5578689a 1141 if (dev != net->loopback_dev) {
1da177e4
LT		 1142 if (dev) {
1143 dev_put(dev);
1144 in6_dev_put(idev);
1145 }
5578689a 1146 dev = net->loopback_dev;
1da177e4
LT		 1147 dev_hold(dev);
1148 idev = in6_dev_get(dev);
1149 if (!idev) {
1150 err = -ENODEV;
1151 goto out;
1152 }
1153 }
1154 rt->u.dst.output = ip6_pkt_discard_out;
1155 rt->u.dst.input = ip6_pkt_discard;
1156 rt->u.dst.error = -ENETUNREACH;
1157 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1158 goto install_route;
1159 }
1160
86872cb5 1161 if (cfg->fc_flags & RTF_GATEWAY) {
1da177e4
LT		 1162 struct in6_addr *gw_addr;
1163 int gwa_type;
1164
86872cb5
TG		 1165 gw_addr = &cfg->fc_gateway;
1166 ipv6_addr_copy(&rt->rt6i_gateway, gw_addr);
1da177e4
LT		 1167 gwa_type = ipv6_addr_type(gw_addr);
1168
1169 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1170 struct rt6_info *grt;
1171
1172 /* IPv6 strictly inhibits using not link-local
1173 addresses as nexthop address.
1174 Otherwise, router will not able to send redirects.
1175 It is very good, but in some (rare!) circumstances
1176 (SIT, PtP, NBMA NOARP links) it is handy to allow
1177 some exceptions. --ANK
1178 */
1179 err = -EINVAL;
1180 if (!(gwa_type&IPV6_ADDR_UNICAST))
1181 goto out;
1182
5578689a 1183 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1da177e4
LT		 1184
1185 err = -EHOSTUNREACH;
1186 if (grt == NULL)
1187 goto out;
1188 if (dev) {
1189 if (dev != grt->rt6i_dev) {
1190 dst_release(&grt->u.dst);
1191 goto out;
1192 }
1193 } else {
1194 dev = grt->rt6i_dev;
1195 idev = grt->rt6i_idev;
1196 dev_hold(dev);
1197 in6_dev_hold(grt->rt6i_idev);
1198 }
1199 if (!(grt->rt6i_flags&RTF_GATEWAY))
1200 err = 0;
1201 dst_release(&grt->u.dst);
1202
1203 if (err)
1204 goto out;
1205 }
1206 err = -EINVAL;
1207 if (dev == NULL || (dev->flags&IFF_LOOPBACK))
1208 goto out;
1209 }
1210
1211 err = -ENODEV;
1212 if (dev == NULL)
1213 goto out;
1214
86872cb5 1215 if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
1da177e4
LT		 1216 rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
1217 if (IS_ERR(rt->rt6i_nexthop)) {
1218 err = PTR_ERR(rt->rt6i_nexthop);
1219 rt->rt6i_nexthop = NULL;
1220 goto out;
1221 }
1222 }
1223
86872cb5 1224 rt->rt6i_flags = cfg->fc_flags;
1da177e4
LT		 1225
1226install_route:
86872cb5
TG		 1227 if (cfg->fc_mx) {
1228 struct nlattr *nla;
1229 int remaining;
1230
1231 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
8f4c1f9b 1232 int type = nla_type(nla);
86872cb5
TG		 1233
1234 if (type) {
1235 if (type > RTAX_MAX) {
1da177e4
LT		 1236 err = -EINVAL;
1237 goto out;
1238 }
86872cb5
TG		 1239
1240 rt->u.dst.metrics[type - 1] = nla_get_u32(nla);
1da177e4 1241 }
1da177e4
LT		 1242 }
1243 }
1244
1245 if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
1246 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1247 if (!rt->u.dst.metrics[RTAX_MTU-1])
1248 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
1249 if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
5578689a 1250 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
1da177e4
LT		 1251 rt->u.dst.dev = dev;
1252 rt->rt6i_idev = idev;
c71099ac 1253 rt->rt6i_table = table;
63152fc0 1254
c346dca1 1255 cfg->fc_nlinfo.nl_net = dev_net(dev);
63152fc0 1256
86872cb5 1257 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 1258
1259out:
1260 if (dev)
1261 dev_put(dev);
1262 if (idev)
1263 in6_dev_put(idev);
1264 if (rt)
40aa7b90 1265 dst_free(&rt->u.dst);
1da177e4
LT		 1266 return err;
1267}
1268
86872cb5 1269static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 1270{
1271 int err;
c71099ac 1272 struct fib6_table *table;
c346dca1 1273 struct net *net = dev_net(rt->rt6i_dev);
1da177e4 1274
8ed67789 1275 if (rt == net->ipv6.ip6_null_entry)
6c813a72
PM		 1276 return -ENOENT;
1277
c71099ac
TG		 1278 table = rt->rt6i_table;
1279 write_lock_bh(&table->tb6_lock);
1da177e4 1280
86872cb5 1281 err = fib6_del(rt, info);
1da177e4
LT		 1282 dst_release(&rt->u.dst);
1283
c71099ac 1284 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1285
1286 return err;
1287}
1288
e0a1ad73
TG		 1289int ip6_del_rt(struct rt6_info *rt)
1290{
4d1169c1 1291 struct nl_info info = {
c346dca1 1292 .nl_net = dev_net(rt->rt6i_dev),
4d1169c1 1293 };
528c4ceb 1294 return __ip6_del_rt(rt, &info);
e0a1ad73
TG		 1295}
1296
86872cb5 1297static int ip6_route_del(struct fib6_config *cfg)
1da177e4 1298{
c71099ac 1299 struct fib6_table *table;
1da177e4
LT		 1300 struct fib6_node *fn;
1301 struct rt6_info *rt;
1302 int err = -ESRCH;
1303
5578689a 1304 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
c71099ac
TG		 1305 if (table == NULL)
1306 return err;
1307
1308 read_lock_bh(&table->tb6_lock);
1da177e4 1309
c71099ac 1310 fn = fib6_locate(&table->tb6_root,
86872cb5
TG		 1311 &cfg->fc_dst, cfg->fc_dst_len,
1312 &cfg->fc_src, cfg->fc_src_len);
1ab1457c 1313
1da177e4 1314 if (fn) {
7cc48263 1315 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
86872cb5 1316 if (cfg->fc_ifindex &&
1da177e4 1317 (rt->rt6i_dev == NULL ||
86872cb5 1318 rt->rt6i_dev->ifindex != cfg->fc_ifindex))
1da177e4 1319 continue;
86872cb5
TG		 1320 if (cfg->fc_flags & RTF_GATEWAY &&
1321 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1da177e4 1322 continue;
86872cb5 1323 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1da177e4
LT		 1324 continue;
1325 dst_hold(&rt->u.dst);
c71099ac 1326 read_unlock_bh(&table->tb6_lock);
1da177e4 1327
86872cb5 1328 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1da177e4
LT		 1329 }
1330 }
c71099ac 1331 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1332
1333 return err;
1334}
1335
1336/*
1337 * Handle redirects
1338 */
a6279458
YH		 1339struct ip6rd_flowi {
1340 struct flowi fl;
1341 struct in6_addr gateway;
1342};
1343
8ed67789
DL		 1344static struct rt6_info *__ip6_route_redirect(struct net *net,
1345 struct fib6_table *table,
a6279458
YH		 1346 struct flowi *fl,
1347 int flags)
1da177e4 1348{
a6279458
YH		 1349 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;
1350 struct rt6_info *rt;
e843b9e1 1351 struct fib6_node *fn;
c71099ac 1352
1da177e4 1353 /*
e843b9e1
YH		 1354 * Get the "current" route for this destination and
1355 * check if the redirect has come from approriate router.
1356 *
1357 * RFC 2461 specifies that redirects should only be
1358 * accepted if they come from the nexthop to the target.
1359 * Due to the way the routes are chosen, this notion
1360 * is a bit fuzzy and one might need to check all possible
1361 * routes.
1da177e4 1362 */
1da177e4 1363
c71099ac 1364 read_lock_bh(&table->tb6_lock);
a6279458 1365 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
e843b9e1 1366restart:
7cc48263 1367 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
e843b9e1
YH		 1368 /*
1369 * Current route is on-link; redirect is always invalid.
1370 *
1371 * Seems, previous statement is not true. It could
1372 * be node, which looks for us as on-link (f.e. proxy ndisc)
1373 * But then router serving it might decide, that we should
1374 * know truth 8)8) --ANK (980726).
1375 */
1376 if (rt6_check_expired(rt))
1377 continue;
1378 if (!(rt->rt6i_flags & RTF_GATEWAY))
1379 continue;
a6279458 1380 if (fl->oif != rt->rt6i_dev->ifindex)
e843b9e1 1381 continue;
a6279458 1382 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
e843b9e1
YH		 1383 continue;
1384 break;
1385 }
a6279458 1386
cb15d9c2 1387 if (!rt)
8ed67789
DL		 1388 rt = net->ipv6.ip6_null_entry;
1389 BACKTRACK(net, &fl->fl6_src);
cb15d9c2 1390out:
a6279458
YH		 1391 dst_hold(&rt->u.dst);
1392
c71099ac 1393 read_unlock_bh(&table->tb6_lock);
e843b9e1 1394
a6279458
YH		 1395 return rt;
1396};
1397
1398static struct rt6_info *ip6_route_redirect(struct in6_addr *dest,
1399 struct in6_addr *src,
1400 struct in6_addr *gateway,
1401 struct net_device *dev)
1402{
adaa70bb 1403 int flags = RT6_LOOKUP_F_HAS_SADDR;
c346dca1 1404 struct net *net = dev_net(dev);
a6279458
YH		 1405 struct ip6rd_flowi rdfl = {
1406 .fl = {
1407 .oif = dev->ifindex,
1408 .nl_u = {
1409 .ip6_u = {
1410 .daddr = *dest,
1411 .saddr = *src,
1412 },
1413 },
1414 },
1415 .gateway = *gateway,
1416 };
adaa70bb
TG		 1417
1418 if (rt6_need_strict(dest))
1419 flags |= RT6_LOOKUP_F_IFACE;
a6279458 1420
5578689a 1421 return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl,
58f09b78 1422 flags, __ip6_route_redirect);
a6279458
YH		 1423}
1424
1425void rt6_redirect(struct in6_addr *dest, struct in6_addr *src,
1426 struct in6_addr *saddr,
1427 struct neighbour *neigh, u8 *lladdr, int on_link)
1428{
1429 struct rt6_info *rt, *nrt = NULL;
1430 struct netevent_redirect netevent;
c346dca1 1431 struct net *net = dev_net(neigh->dev);
a6279458
YH		 1432
1433 rt = ip6_route_redirect(dest, src, saddr, neigh->dev);
1434
8ed67789 1435 if (rt == net->ipv6.ip6_null_entry) {
1da177e4
LT		 1436 if (net_ratelimit())
1437 printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
1438 "for redirect target\n");
a6279458 1439 goto out;
1da177e4
LT		 1440 }
1441
1da177e4
LT		 1442 /*
1443 * We have finally decided to accept it.
1444 */
1445
1ab1457c 1446 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 1447 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1448 NEIGH_UPDATE_F_OVERRIDE|
1449 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1450 NEIGH_UPDATE_F_ISROUTER))
1451 );
1452
1453 /*
1454 * Redirect received -> path was valid.
1455 * Look, redirects are sent only in response to data packets,
1456 * so that this nexthop apparently is reachable. --ANK
1457 */
1458 dst_confirm(&rt->u.dst);
1459
1460 /* Duplicate redirect: silently ignore. */
1461 if (neigh == rt->u.dst.neighbour)
1462 goto out;
1463
1464 nrt = ip6_rt_copy(rt);
1465 if (nrt == NULL)
1466 goto out;
1467
1468 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1469 if (on_link)
1470 nrt->rt6i_flags &= ~RTF_GATEWAY;
1471
1472 ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
1473 nrt->rt6i_dst.plen = 128;
1474 nrt->u.dst.flags |= DST_HOST;
1475
1476 ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
1477 nrt->rt6i_nexthop = neigh_clone(neigh);
1478 /* Reset pmtu, it may be better */
1479 nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
c346dca1 1480 nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dev_net(neigh->dev),
5578689a 1481 dst_mtu(&nrt->u.dst));
1da177e4 1482
40e22e8f 1483 if (ip6_ins_rt(nrt))
1da177e4
LT		 1484 goto out;
1485
8d71740c
TT		 1486 netevent.old = &rt->u.dst;
1487 netevent.new = &nrt->u.dst;
1488 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1489
1da177e4 1490 if (rt->rt6i_flags&RTF_CACHE) {
e0a1ad73 1491 ip6_del_rt(rt);
1da177e4
LT		 1492 return;
1493 }
1494
1495out:
1ab1457c 1496 dst_release(&rt->u.dst);
1da177e4
LT		 1497 return;
1498}
1499
1500/*
1501 * Handle ICMP "packet too big" messages
1502 * i.e. Path MTU discovery
1503 */
1504
1505void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
1506 struct net_device *dev, u32 pmtu)
1507{
1508 struct rt6_info *rt, *nrt;
c346dca1 1509 struct net *net = dev_net(dev);
1da177e4
LT		 1510 int allfrag = 0;
1511
5578689a 1512 rt = rt6_lookup(net, daddr, saddr, dev->ifindex, 0);
1da177e4
LT		 1513 if (rt == NULL)
1514 return;
1515
1516 if (pmtu >= dst_mtu(&rt->u.dst))
1517 goto out;
1518
1519 if (pmtu < IPV6_MIN_MTU) {
1520 /*
1ab1457c 1521 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
1da177e4
LT		 1522 * MTU (1280) and a fragment header should always be included
1523 * after a node receiving Too Big message reporting PMTU is
1524 * less than the IPv6 Minimum Link MTU.
1525 */
1526 pmtu = IPV6_MIN_MTU;
1527 allfrag = 1;
1528 }
1529
1530 /* New mtu received -> path was valid.
1531 They are sent only in response to data packets,
1532 so that this nexthop apparently is reachable. --ANK
1533 */
1534 dst_confirm(&rt->u.dst);
1535
1536 /* Host route. If it is static, it would be better
1537 not to override it, but add new one, so that
1538 when cache entry will expire old pmtu
1539 would return automatically.
1540 */
1541 if (rt->rt6i_flags & RTF_CACHE) {
1542 rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1543 if (allfrag)
1544 rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
5578689a 1545 dst_set_expires(&rt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires);
1da177e4
LT		 1546 rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
1547 goto out;
1548 }
1549
1550 /* Network route.
1551 Two cases are possible:
1552 1. It is connected route. Action: COW
1553 2. It is gatewayed route or NONEXTHOP route. Action: clone it.
1554 */
d5315b50 1555 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
a1e78363 1556 nrt = rt6_alloc_cow(rt, daddr, saddr);
d5315b50
YH		 1557 else
1558 nrt = rt6_alloc_clone(rt, daddr);
a1e78363 1559
d5315b50 1560 if (nrt) {
a1e78363
YH		 1561 nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1562 if (allfrag)
1563 nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1564
1565 /* According to RFC 1981, detecting PMTU increase shouldn't be
1566 * happened within 5 mins, the recommended timer is 10 mins.
1567 * Here this route expiration time is set to ip6_rt_mtu_expires
1568 * which is 10 mins. After 10 mins the decreased pmtu is expired
1569 * and detecting PMTU increase will be automatically happened.
1570 */
5578689a 1571 dst_set_expires(&nrt->u.dst, net->ipv6.sysctl.ip6_rt_mtu_expires);
a1e78363
YH		 1572 nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
1573
40e22e8f 1574 ip6_ins_rt(nrt);
1da177e4 1575 }
1da177e4
LT		 1576out:
1577 dst_release(&rt->u.dst);
1578}
1579
1580/*
1581 * Misc support functions
1582 */
1583
1584static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
1585{
c346dca1 1586 struct net *net = dev_net(ort->rt6i_dev);
f2fc6a54 1587 struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
1da177e4
LT		 1588
1589 if (rt) {
1590 rt->u.dst.input = ort->u.dst.input;
1591 rt->u.dst.output = ort->u.dst.output;
1592
1593 memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
22e1e4d8 1594 rt->u.dst.error = ort->u.dst.error;
1da177e4
LT		 1595 rt->u.dst.dev = ort->u.dst.dev;
1596 if (rt->u.dst.dev)
1597 dev_hold(rt->u.dst.dev);
1598 rt->rt6i_idev = ort->rt6i_idev;
1599 if (rt->rt6i_idev)
1600 in6_dev_hold(rt->rt6i_idev);
1601 rt->u.dst.lastuse = jiffies;
1602 rt->rt6i_expires = 0;
1603
1604 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
1605 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
1606 rt->rt6i_metric = 0;
1607
1608 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1609#ifdef CONFIG_IPV6_SUBTREES
1610 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1611#endif
c71099ac 1612 rt->rt6i_table = ort->rt6i_table;
1da177e4
LT		 1613 }
1614 return rt;
1615}
1616
70ceb4f5 1617#ifdef CONFIG_IPV6_ROUTE_INFO
efa2cea0
DL		 1618static struct rt6_info *rt6_get_route_info(struct net *net,
1619 struct in6_addr *prefix, int prefixlen,
70ceb4f5
YH		 1620 struct in6_addr *gwaddr, int ifindex)
1621{
1622 struct fib6_node *fn;
1623 struct rt6_info *rt = NULL;
c71099ac
TG		 1624 struct fib6_table *table;
1625
efa2cea0 1626 table = fib6_get_table(net, RT6_TABLE_INFO);
c71099ac
TG		 1627 if (table == NULL)
1628 return NULL;
70ceb4f5 1629
c71099ac
TG		 1630 write_lock_bh(&table->tb6_lock);
1631 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
70ceb4f5
YH		 1632 if (!fn)
1633 goto out;
1634
7cc48263 1635 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
70ceb4f5
YH		 1636 if (rt->rt6i_dev->ifindex != ifindex)
1637 continue;
1638 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1639 continue;
1640 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1641 continue;
1642 dst_hold(&rt->u.dst);
1643 break;
1644 }
1645out:
c71099ac 1646 write_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 1647 return rt;
1648}
1649
efa2cea0
DL		 1650static struct rt6_info *rt6_add_route_info(struct net *net,
1651 struct in6_addr *prefix, int prefixlen,
70ceb4f5
YH		 1652 struct in6_addr *gwaddr, int ifindex,
1653 unsigned pref)
1654{
86872cb5
TG		 1655 struct fib6_config cfg = {
1656 .fc_table = RT6_TABLE_INFO,
238fc7ea 1657 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 1658 .fc_ifindex = ifindex,
1659 .fc_dst_len = prefixlen,
1660 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1661 RTF_UP | RTF_PREF(pref),
efa2cea0
DL		 1662 .fc_nlinfo.pid = 0,
1663 .fc_nlinfo.nlh = NULL,
1664 .fc_nlinfo.nl_net = net,
86872cb5
TG		 1665 };
1666
1667 ipv6_addr_copy(&cfg.fc_dst, prefix);
1668 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
70ceb4f5 1669
e317da96
YH		 1670 /* We should treat it as a default route if prefix length is 0. */
1671 if (!prefixlen)
86872cb5 1672 cfg.fc_flags |= RTF_DEFAULT;
70ceb4f5 1673
86872cb5 1674 ip6_route_add(&cfg);
70ceb4f5 1675
efa2cea0 1676 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
70ceb4f5
YH		 1677}
1678#endif
1679
1da177e4 1680struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
1ab1457c 1681{
1da177e4 1682 struct rt6_info *rt;
c71099ac 1683 struct fib6_table *table;
1da177e4 1684
c346dca1 1685 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
c71099ac
TG		 1686 if (table == NULL)
1687 return NULL;
1da177e4 1688
c71099ac 1689 write_lock_bh(&table->tb6_lock);
7cc48263 1690 for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) {
1da177e4 1691 if (dev == rt->rt6i_dev &&
045927ff 1692 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 1693 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1694 break;
1695 }
1696 if (rt)
1697 dst_hold(&rt->u.dst);
c71099ac 1698 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1699 return rt;
1700}
1701
1702struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
ebacaaa0
YH		 1703 struct net_device *dev,
1704 unsigned int pref)
1da177e4 1705{
86872cb5
TG		 1706 struct fib6_config cfg = {
1707 .fc_table = RT6_TABLE_DFLT,
238fc7ea 1708 .fc_metric = IP6_RT_PRIO_USER,
86872cb5
TG		 1709 .fc_ifindex = dev->ifindex,
1710 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1711 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
5578689a
DL		 1712 .fc_nlinfo.pid = 0,
1713 .fc_nlinfo.nlh = NULL,
c346dca1 1714 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1715 };
1da177e4 1716
86872cb5 1717 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1da177e4 1718
86872cb5 1719 ip6_route_add(&cfg);
1da177e4 1720
1da177e4
LT		 1721 return rt6_get_dflt_router(gwaddr, dev);
1722}
1723
7b4da532 1724void rt6_purge_dflt_routers(struct net *net)
1da177e4
LT		 1725{
1726 struct rt6_info *rt;
c71099ac
TG		 1727 struct fib6_table *table;
1728
1729 /* NOTE: Keep consistent with rt6_get_dflt_router */
7b4da532 1730 table = fib6_get_table(net, RT6_TABLE_DFLT);
c71099ac
TG		 1731 if (table == NULL)
1732 return;
1da177e4
LT		 1733
1734restart:
c71099ac 1735 read_lock_bh(&table->tb6_lock);
7cc48263 1736 for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) {
1da177e4
LT		 1737 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
1738 dst_hold(&rt->u.dst);
c71099ac 1739 read_unlock_bh(&table->tb6_lock);
e0a1ad73 1740 ip6_del_rt(rt);
1da177e4
LT		 1741 goto restart;
1742 }
1743 }
c71099ac 1744 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1745}
1746
5578689a
DL		 1747static void rtmsg_to_fib6_config(struct net *net,
1748 struct in6_rtmsg *rtmsg,
86872cb5
TG		 1749 struct fib6_config *cfg)
1750{
1751 memset(cfg, 0, sizeof(*cfg));
1752
1753 cfg->fc_table = RT6_TABLE_MAIN;
1754 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1755 cfg->fc_metric = rtmsg->rtmsg_metric;
1756 cfg->fc_expires = rtmsg->rtmsg_info;
1757 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1758 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1759 cfg->fc_flags = rtmsg->rtmsg_flags;
1760
5578689a 1761 cfg->fc_nlinfo.nl_net = net;
f1243c2d 1762
86872cb5
TG		 1763 ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst);
1764 ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src);
1765 ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway);
1766}
1767
5578689a 1768int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4 1769{
86872cb5 1770 struct fib6_config cfg;
1da177e4
LT		 1771 struct in6_rtmsg rtmsg;
1772 int err;
1773
1774 switch(cmd) {
1775 case SIOCADDRT: /* Add a route */
1776 case SIOCDELRT: /* Delete a route */
1777 if (!capable(CAP_NET_ADMIN))
1778 return -EPERM;
1779 err = copy_from_user(&rtmsg, arg,
1780 sizeof(struct in6_rtmsg));
1781 if (err)
1782 return -EFAULT;
86872cb5 1783
5578689a 1784 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
86872cb5 1785
1da177e4
LT		 1786 rtnl_lock();
1787 switch (cmd) {
1788 case SIOCADDRT:
86872cb5 1789 err = ip6_route_add(&cfg);
1da177e4
LT		 1790 break;
1791 case SIOCDELRT:
86872cb5 1792 err = ip6_route_del(&cfg);
1da177e4
LT		 1793 break;
1794 default:
1795 err = -EINVAL;
1796 }
1797 rtnl_unlock();
1798
1799 return err;
3ff50b79 1800 }
1da177e4
LT		 1801
1802 return -EINVAL;
1803}
1804
1805/*
1806 * Drop the packet on the floor
1807 */
1808
50eb431d 1809static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes)
1da177e4 1810{
612f09e8
YH		 1811 int type;
1812 switch (ipstats_mib_noroutes) {
1813 case IPSTATS_MIB_INNOROUTES:
0660e03f 1814 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
612f09e8
YH		 1815 if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) {
1816 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS);
1817 break;
1818 }
1819 /* FALLTHROUGH */
1820 case IPSTATS_MIB_OUTNOROUTES:
1821 IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes);
1822 break;
1823 }
9ce8ade0 1824 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev);
1da177e4
LT		 1825 kfree_skb(skb);
1826 return 0;
1827}
1828
9ce8ade0
TG		 1829static int ip6_pkt_discard(struct sk_buff *skb)
1830{
612f09e8 1831 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 1832}
1833
20380731 1834static int ip6_pkt_discard_out(struct sk_buff *skb)
1da177e4
LT		 1835{
1836 skb->dev = skb->dst->dev;
612f09e8 1837 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1da177e4
LT		 1838}
1839
6723ab54
DM		 1840#ifdef CONFIG_IPV6_MULTIPLE_TABLES
1841
9ce8ade0
TG		 1842static int ip6_pkt_prohibit(struct sk_buff *skb)
1843{
612f09e8 1844 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
9ce8ade0
TG		 1845}
1846
1847static int ip6_pkt_prohibit_out(struct sk_buff *skb)
1848{
1849 skb->dev = skb->dst->dev;
612f09e8 1850 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
9ce8ade0
TG		 1851}
1852
6723ab54
DM		 1853#endif
1854
1da177e4
LT		 1855/*
1856 * Allocate a dst for local (unicast / anycast) address.
1857 */
1858
1859struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
1860 const struct in6_addr *addr,
1861 int anycast)
1862{
c346dca1 1863 struct net *net = dev_net(idev->dev);
f2fc6a54 1864 struct rt6_info *rt = ip6_dst_alloc(net->ipv6.ip6_dst_ops);
1da177e4
LT		 1865
1866 if (rt == NULL)
1867 return ERR_PTR(-ENOMEM);
1868
5578689a 1869 dev_hold(net->loopback_dev);
1da177e4
LT		 1870 in6_dev_hold(idev);
1871
1872 rt->u.dst.flags = DST_HOST;
1873 rt->u.dst.input = ip6_input;
1874 rt->u.dst.output = ip6_output;
5578689a 1875 rt->rt6i_dev = net->loopback_dev;
1da177e4
LT		 1876 rt->rt6i_idev = idev;
1877 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
5578689a 1878 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, dst_mtu(&rt->u.dst));
1da177e4
LT		 1879 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1880 rt->u.dst.obsolete = -1;
1881
1882 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 1883 if (anycast)
1884 rt->rt6i_flags |= RTF_ANYCAST;
1885 else
1da177e4
LT		 1886 rt->rt6i_flags |= RTF_LOCAL;
1887 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
1888 if (rt->rt6i_nexthop == NULL) {
40aa7b90 1889 dst_free(&rt->u.dst);
1da177e4
LT		 1890 return ERR_PTR(-ENOMEM);
1891 }
1892
1893 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
1894 rt->rt6i_dst.plen = 128;
5578689a 1895 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
1da177e4
LT		 1896
1897 atomic_set(&rt->u.dst.__refcnt, 1);
1898
1899 return rt;
1900}
1901
8ed67789
DL		 1902struct arg_dev_net {
1903 struct net_device *dev;
1904 struct net *net;
1905};
1906
1da177e4
LT		 1907static int fib6_ifdown(struct rt6_info *rt, void *arg)
1908{
8ed67789
DL		 1909 struct net_device *dev = ((struct arg_dev_net *)arg)->dev;
1910 struct net *net = ((struct arg_dev_net *)arg)->net;
1911
1912 if (((void *)rt->rt6i_dev == dev || dev == NULL) &&
1913 rt != net->ipv6.ip6_null_entry) {
1da177e4
LT		 1914 RT6_TRACE("deleted by ifdown %p\n", rt);
1915 return -1;
1916 }
1917 return 0;
1918}
1919
f3db4851 1920void rt6_ifdown(struct net *net, struct net_device *dev)
1da177e4 1921{
8ed67789
DL		 1922 struct arg_dev_net adn = {
1923 .dev = dev,
1924 .net = net,
1925 };
1926
1927 fib6_clean_all(net, fib6_ifdown, 0, &adn);
1da177e4
LT		 1928}
1929
1930struct rt6_mtu_change_arg
1931{
1932 struct net_device *dev;
1933 unsigned mtu;
1934};
1935
1936static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
1937{
1938 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
1939 struct inet6_dev *idev;
c346dca1 1940 struct net *net = dev_net(arg->dev);
1da177e4
LT		 1941
1942 /* In IPv6 pmtu discovery is not optional,
1943 so that RTAX_MTU lock cannot disable it.
1944 We still use this lock to block changes
1945 caused by addrconf/ndisc.
1946 */
1947
1948 idev = __in6_dev_get(arg->dev);
1949 if (idev == NULL)
1950 return 0;
1951
1952 /* For administrative MTU increase, there is no way to discover
1953 IPv6 PMTU increase, so PMTU increase should be updated here.
1954 Since RFC 1981 doesn't include administrative MTU increase
1955 update PMTU increase is a MUST. (i.e. jumbo frame)
1956 */
1957 /*
1958 If new MTU is less than route PMTU, this new MTU will be the
1959 lowest MTU in the path, update the route PMTU to reflect PMTU
1960 decreases; if new MTU is greater than route PMTU, and the
1961 old MTU is the lowest MTU in the path, update the route PMTU
1962 to reflect the increase. In this case if the other nodes' MTU
1963 also have the lowest MTU, TOO BIG MESSAGE will be lead to
1964 PMTU discouvery.
1965 */
1966 if (rt->rt6i_dev == arg->dev &&
1967 !dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
23717795 1968 (dst_mtu(&rt->u.dst) >= arg->mtu ||
1ab1457c 1969 (dst_mtu(&rt->u.dst) < arg->mtu &&
566cfd8f 1970 dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) {
1da177e4 1971 rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
5578689a 1972 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(net, arg->mtu);
566cfd8f 1973 }
1da177e4
LT		 1974 return 0;
1975}
1976
1977void rt6_mtu_change(struct net_device *dev, unsigned mtu)
1978{
c71099ac
TG		 1979 struct rt6_mtu_change_arg arg = {
1980 .dev = dev,
1981 .mtu = mtu,
1982 };
1da177e4 1983
c346dca1 1984 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
1da177e4
LT		 1985}
1986
ef7c79ed 1987static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
5176f91e 1988 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
86872cb5 1989 [RTA_OIF] = { .type = NLA_U32 },
ab364a6f 1990 [RTA_IIF] = { .type = NLA_U32 },
86872cb5
TG		 1991 [RTA_PRIORITY] = { .type = NLA_U32 },
1992 [RTA_METRICS] = { .type = NLA_NESTED },
1993};
1994
1995static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
1996 struct fib6_config *cfg)
1da177e4 1997{
86872cb5
TG		 1998 struct rtmsg *rtm;
1999 struct nlattr *tb[RTA_MAX+1];
2000 int err;
1da177e4 2001
86872cb5
TG		 2002 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2003 if (err < 0)
2004 goto errout;
1da177e4 2005
86872cb5
TG		 2006 err = -EINVAL;
2007 rtm = nlmsg_data(nlh);
2008 memset(cfg, 0, sizeof(*cfg));
2009
2010 cfg->fc_table = rtm->rtm_table;
2011 cfg->fc_dst_len = rtm->rtm_dst_len;
2012 cfg->fc_src_len = rtm->rtm_src_len;
2013 cfg->fc_flags = RTF_UP;
2014 cfg->fc_protocol = rtm->rtm_protocol;
2015
2016 if (rtm->rtm_type == RTN_UNREACHABLE)
2017 cfg->fc_flags |= RTF_REJECT;
2018
2019 cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
2020 cfg->fc_nlinfo.nlh = nlh;
3b1e0a65 2021 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
86872cb5
TG		 2022
2023 if (tb[RTA_GATEWAY]) {
2024 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2025 cfg->fc_flags |= RTF_GATEWAY;
1da177e4 2026 }
86872cb5
TG		 2027
2028 if (tb[RTA_DST]) {
2029 int plen = (rtm->rtm_dst_len + 7) >> 3;
2030
2031 if (nla_len(tb[RTA_DST]) < plen)
2032 goto errout;
2033
2034 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1da177e4 2035 }
86872cb5
TG		 2036
2037 if (tb[RTA_SRC]) {
2038 int plen = (rtm->rtm_src_len + 7) >> 3;
2039
2040 if (nla_len(tb[RTA_SRC]) < plen)
2041 goto errout;
2042
2043 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1da177e4 2044 }
86872cb5
TG		 2045
2046 if (tb[RTA_OIF])
2047 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2048
2049 if (tb[RTA_PRIORITY])
2050 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2051
2052 if (tb[RTA_METRICS]) {
2053 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2054 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1da177e4 2055 }
86872cb5
TG		 2056
2057 if (tb[RTA_TABLE])
2058 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2059
2060 err = 0;
2061errout:
2062 return err;
1da177e4
LT		 2063}
2064
c127ea2c 2065static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1da177e4 2066{
86872cb5
TG		 2067 struct fib6_config cfg;
2068 int err;
1da177e4 2069
86872cb5
TG		 2070 err = rtm_to_fib6_config(skb, nlh, &cfg);
2071 if (err < 0)
2072 return err;
2073
2074 return ip6_route_del(&cfg);
1da177e4
LT		 2075}
2076
c127ea2c 2077static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1da177e4 2078{
86872cb5
TG		 2079 struct fib6_config cfg;
2080 int err;
1da177e4 2081
86872cb5
TG		 2082 err = rtm_to_fib6_config(skb, nlh, &cfg);
2083 if (err < 0)
2084 return err;
2085
2086 return ip6_route_add(&cfg);
1da177e4
LT		 2087}
2088
339bf98f
TG		 2089static inline size_t rt6_nlmsg_size(void)
2090{
2091 return NLMSG_ALIGN(sizeof(struct rtmsg))
2092 + nla_total_size(16) /* RTA_SRC */
2093 + nla_total_size(16) /* RTA_DST */
2094 + nla_total_size(16) /* RTA_GATEWAY */
2095 + nla_total_size(16) /* RTA_PREFSRC */
2096 + nla_total_size(4) /* RTA_TABLE */
2097 + nla_total_size(4) /* RTA_IIF */
2098 + nla_total_size(4) /* RTA_OIF */
2099 + nla_total_size(4) /* RTA_PRIORITY */
6a2b9ce0 2100 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
339bf98f
TG		 2101 + nla_total_size(sizeof(struct rta_cacheinfo));
2102}
2103
1da177e4 2104static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
0d51aa80
JHS		 2105 struct in6_addr *dst, struct in6_addr *src,
2106 int iif, int type, u32 pid, u32 seq,
2107 int prefix, unsigned int flags)
1da177e4
LT		 2108{
2109 struct rtmsg *rtm;
2d7202bf 2110 struct nlmsghdr *nlh;
e3703b3d 2111 long expires;
9e762a4a 2112 u32 table;
1da177e4
LT		 2113
2114 if (prefix) { /* user wants prefix routes only */
2115 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2116 /* success since this is not a prefix route */
2117 return 1;
2118 }
2119 }
2120
2d7202bf
TG		 2121 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
2122 if (nlh == NULL)
26932566 2123 return -EMSGSIZE;
2d7202bf
TG		 2124
2125 rtm = nlmsg_data(nlh);
1da177e4
LT		 2126 rtm->rtm_family = AF_INET6;
2127 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2128 rtm->rtm_src_len = rt->rt6i_src.plen;
2129 rtm->rtm_tos = 0;
c71099ac 2130 if (rt->rt6i_table)
9e762a4a 2131 table = rt->rt6i_table->tb6_id;
c71099ac 2132 else
9e762a4a
PM		 2133 table = RT6_TABLE_UNSPEC;
2134 rtm->rtm_table = table;
2d7202bf 2135 NLA_PUT_U32(skb, RTA_TABLE, table);
1da177e4
LT		 2136 if (rt->rt6i_flags&RTF_REJECT)
2137 rtm->rtm_type = RTN_UNREACHABLE;
2138 else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
2139 rtm->rtm_type = RTN_LOCAL;
2140 else
2141 rtm->rtm_type = RTN_UNICAST;
2142 rtm->rtm_flags = 0;
2143 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2144 rtm->rtm_protocol = rt->rt6i_protocol;
2145 if (rt->rt6i_flags&RTF_DYNAMIC)
2146 rtm->rtm_protocol = RTPROT_REDIRECT;
2147 else if (rt->rt6i_flags & RTF_ADDRCONF)
2148 rtm->rtm_protocol = RTPROT_KERNEL;
2149 else if (rt->rt6i_flags&RTF_DEFAULT)
2150 rtm->rtm_protocol = RTPROT_RA;
2151
2152 if (rt->rt6i_flags&RTF_CACHE)
2153 rtm->rtm_flags |= RTM_F_CLONED;
2154
2155 if (dst) {
2d7202bf 2156 NLA_PUT(skb, RTA_DST, 16, dst);
1ab1457c 2157 rtm->rtm_dst_len = 128;
1da177e4 2158 } else if (rtm->rtm_dst_len)
2d7202bf 2159 NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
1da177e4
LT		 2160#ifdef CONFIG_IPV6_SUBTREES
2161 if (src) {
2d7202bf 2162 NLA_PUT(skb, RTA_SRC, 16, src);
1ab1457c 2163 rtm->rtm_src_len = 128;
1da177e4 2164 } else if (rtm->rtm_src_len)
2d7202bf 2165 NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
1da177e4
LT		 2166#endif
2167 if (iif)
2d7202bf 2168 NLA_PUT_U32(skb, RTA_IIF, iif);
1da177e4
LT		 2169 else if (dst) {
2170 struct in6_addr saddr_buf;
5e5f3f0f 2171 if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev,
7cbca67c 2172 dst, 0, &saddr_buf) == 0)
2d7202bf 2173 NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
1da177e4 2174 }
2d7202bf 2175
1da177e4 2176 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
2d7202bf
TG		 2177 goto nla_put_failure;
2178
1da177e4 2179 if (rt->u.dst.neighbour)
2d7202bf
TG		 2180 NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);
2181
1da177e4 2182 if (rt->u.dst.dev)
2d7202bf
TG		 2183 NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex);
2184
2185 NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric);
e3703b3d
TG		 2186
2187 expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0;
2188 if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0,
2189 expires, rt->u.dst.error) < 0)
2190 goto nla_put_failure;
2d7202bf
TG		 2191
2192 return nlmsg_end(skb, nlh);
2193
2194nla_put_failure:
26932566
PM		 2195 nlmsg_cancel(skb, nlh);
2196 return -EMSGSIZE;
1da177e4
LT		 2197}
2198
1b43af54 2199int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 2200{
2201 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2202 int prefix;
2203
2d7202bf
TG		 2204 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2205 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
1da177e4
LT		 2206 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2207 } else
2208 prefix = 0;
2209
2210 return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2211 NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
0d51aa80 2212 prefix, NLM_F_MULTI);
1da177e4
LT		 2213}
2214
c127ea2c 2215static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
1da177e4 2216{
3b1e0a65 2217 struct net *net = sock_net(in_skb->sk);
ab364a6f
TG		 2218 struct nlattr *tb[RTA_MAX+1];
2219 struct rt6_info *rt;
1da177e4 2220 struct sk_buff *skb;
ab364a6f 2221 struct rtmsg *rtm;
1da177e4 2222 struct flowi fl;
ab364a6f 2223 int err, iif = 0;
1da177e4 2224
ab364a6f
TG		 2225 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2226 if (err < 0)
2227 goto errout;
1da177e4 2228
ab364a6f 2229 err = -EINVAL;
1da177e4 2230 memset(&fl, 0, sizeof(fl));
1da177e4 2231
ab364a6f
TG		 2232 if (tb[RTA_SRC]) {
2233 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2234 goto errout;
2235
2236 ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC]));
2237 }
2238
2239 if (tb[RTA_DST]) {
2240 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2241 goto errout;
2242
2243 ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST]));
2244 }
2245
2246 if (tb[RTA_IIF])
2247 iif = nla_get_u32(tb[RTA_IIF]);
2248
2249 if (tb[RTA_OIF])
2250 fl.oif = nla_get_u32(tb[RTA_OIF]);
1da177e4
LT		 2251
2252 if (iif) {
2253 struct net_device *dev;
5578689a 2254 dev = __dev_get_by_index(net, iif);
1da177e4
LT		 2255 if (!dev) {
2256 err = -ENODEV;
ab364a6f 2257 goto errout;
1da177e4
LT		 2258 }
2259 }
2260
ab364a6f
TG		 2261 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2262 if (skb == NULL) {
2263 err = -ENOBUFS;
2264 goto errout;
2265 }
1da177e4 2266
ab364a6f
TG		 2267 /* Reserve room for dummy headers, this skb can pass
2268 through good chunk of routing engine.
2269 */
459a98ed 2270 skb_reset_mac_header(skb);
ab364a6f 2271 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1da177e4 2272
8a3edd80 2273 rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl);
1da177e4
LT		 2274 skb->dst = &rt->u.dst;
2275
ab364a6f 2276 err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
1da177e4 2277 RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
0d51aa80 2278 nlh->nlmsg_seq, 0, 0);
1da177e4 2279 if (err < 0) {
ab364a6f
TG		 2280 kfree_skb(skb);
2281 goto errout;
1da177e4
LT		 2282 }
2283
5578689a 2284 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
ab364a6f 2285errout:
1da177e4 2286 return err;
1da177e4
LT		 2287}
2288
86872cb5 2289void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
1da177e4
LT		 2290{
2291 struct sk_buff *skb;
5578689a 2292 struct net *net = info->nl_net;
528c4ceb
DL		 2293 u32 seq;
2294 int err;
2295
2296 err = -ENOBUFS;
2297 seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0;
86872cb5 2298
339bf98f 2299 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
21713ebc
TG		 2300 if (skb == NULL)
2301 goto errout;
2302
528c4ceb
DL		 2303 err = rt6_fill_node(skb, rt, NULL, NULL, 0,
2304 event, info->pid, seq, 0, 0);
26932566
PM		 2305 if (err < 0) {
2306 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2307 WARN_ON(err == -EMSGSIZE);
2308 kfree_skb(skb);
2309 goto errout;
2310 }
5578689a
DL		 2311 err = rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE,
2312 info->nlh, gfp_any());
21713ebc
TG		 2313errout:
2314 if (err < 0)
5578689a 2315 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 2316}
2317
8ed67789
DL		 2318static int ip6_route_dev_notify(struct notifier_block *this,
2319 unsigned long event, void *data)
2320{
2321 struct net_device *dev = (struct net_device *)data;
c346dca1 2322 struct net *net = dev_net(dev);
8ed67789
DL		 2323
2324 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2325 net->ipv6.ip6_null_entry->u.dst.dev = dev;
2326 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2327#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2328 net->ipv6.ip6_prohibit_entry->u.dst.dev = dev;
2329 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2330 net->ipv6.ip6_blk_hole_entry->u.dst.dev = dev;
2331 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2332#endif
2333 }
2334
2335 return NOTIFY_OK;
2336}
2337
1da177e4
LT		 2338/*
2339 * /proc
2340 */
2341
2342#ifdef CONFIG_PROC_FS
2343
2344#define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1)
2345
2346struct rt6_proc_arg
2347{
2348 char *buffer;
2349 int offset;
2350 int length;
2351 int skip;
2352 int len;
2353};
2354
2355static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2356{
33120b30 2357 struct seq_file *m = p_arg;
1da177e4 2358
33120b30
AD		 2359 seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr),
2360 rt->rt6i_dst.plen);
1da177e4
LT		 2361
2362#ifdef CONFIG_IPV6_SUBTREES
33120b30
AD		 2363 seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr),
2364 rt->rt6i_src.plen);
1da177e4 2365#else
33120b30 2366 seq_puts(m, "00000000000000000000000000000000 00 ");
1da177e4
LT		 2367#endif
2368
2369 if (rt->rt6i_nexthop) {
33120b30
AD		 2370 seq_printf(m, NIP6_SEQFMT,
2371 NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key)));
1da177e4 2372 } else {
33120b30 2373 seq_puts(m, "00000000000000000000000000000000");
1da177e4 2374 }
33120b30
AD		 2375 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2376 rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
2377 rt->u.dst.__use, rt->rt6i_flags,
2378 rt->rt6i_dev ? rt->rt6i_dev->name : "");
1da177e4
LT		 2379 return 0;
2380}
2381
33120b30 2382static int ipv6_route_show(struct seq_file *m, void *v)
1da177e4 2383{
f3db4851
DL		 2384 struct net *net = (struct net *)m->private;
2385 fib6_clean_all(net, rt6_info_route, 0, m);
33120b30
AD		 2386 return 0;
2387}
1da177e4 2388
33120b30
AD		 2389static int ipv6_route_open(struct inode *inode, struct file *file)
2390{
a2333525 2391 int err;
f3db4851
DL		 2392 struct net *net = get_proc_net(inode);
2393 if (!net)
2394 return -ENXIO;
a2333525
PE		 2395
2396 err = single_open(file, ipv6_route_show, net);
2397 if (err < 0) {
2398 put_net(net);
2399 return err;
2400 }
2401
2402 return 0;
f3db4851
DL		 2403}
2404
2405static int ipv6_route_release(struct inode *inode, struct file *file)
2406{
2407 struct seq_file *seq = file->private_data;
2408 struct net *net = seq->private;
2409 put_net(net);
2410 return single_release(inode, file);
1da177e4
LT		 2411}
2412
33120b30
AD		 2413static const struct file_operations ipv6_route_proc_fops = {
2414 .owner = THIS_MODULE,
2415 .open = ipv6_route_open,
2416 .read = seq_read,
2417 .llseek = seq_lseek,
f3db4851 2418 .release = ipv6_route_release,
33120b30
AD		 2419};
2420
1da177e4
LT		 2421static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2422{
69ddb805 2423 struct net *net = (struct net *)seq->private;
1da177e4 2424 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
69ddb805
DL		 2425 net->ipv6.rt6_stats->fib_nodes,
2426 net->ipv6.rt6_stats->fib_route_nodes,
2427 net->ipv6.rt6_stats->fib_rt_alloc,
2428 net->ipv6.rt6_stats->fib_rt_entries,
2429 net->ipv6.rt6_stats->fib_rt_cache,
f2fc6a54 2430 atomic_read(&net->ipv6.ip6_dst_ops->entries),
69ddb805 2431 net->ipv6.rt6_stats->fib_discarded_routes);
1da177e4
LT		 2432
2433 return 0;
2434}
2435
2436static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2437{
a2333525 2438 int err;
69ddb805 2439 struct net *net = get_proc_net(inode);
a2333525
PE		 2440 if (!net)
2441 return -ENXIO;
2442
2443 err = single_open(file, rt6_stats_seq_show, net);
2444 if (err < 0) {
2445 put_net(net);
2446 return err;
2447 }
2448
2449 return 0;
69ddb805
DL		 2450}
2451
2452static int rt6_stats_seq_release(struct inode *inode, struct file *file)
2453{
2454 struct seq_file *seq = file->private_data;
2455 struct net *net = (struct net *)seq->private;
2456 put_net(net);
2457 return single_release(inode, file);
1da177e4
LT		 2458}
2459
9a32144e 2460static const struct file_operations rt6_stats_seq_fops = {
1da177e4
LT		 2461 .owner = THIS_MODULE,
2462 .open = rt6_stats_seq_open,
2463 .read = seq_read,
2464 .llseek = seq_lseek,
69ddb805 2465 .release = rt6_stats_seq_release,
1da177e4
LT		 2466};
2467#endif /* CONFIG_PROC_FS */
2468
2469#ifdef CONFIG_SYSCTL
2470
1da177e4
LT		 2471static
2472int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
2473 void __user *buffer, size_t *lenp, loff_t *ppos)
2474{
5b7c931d
DL		 2475 struct net *net = current->nsproxy->net_ns;
2476 int delay = net->ipv6.sysctl.flush_delay;
1da177e4
LT		 2477 if (write) {
2478 proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
5b7c931d 2479 fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
1da177e4
LT		 2480 return 0;
2481 } else
2482 return -EINVAL;
2483}
2484
760f2d01 2485ctl_table ipv6_route_table_template[] = {
1ab1457c 2486 {
1da177e4 2487 .procname = "flush",
4990509f 2488 .data = &init_net.ipv6.sysctl.flush_delay,
1da177e4 2489 .maxlen = sizeof(int),
89c8b3a1 2490 .mode = 0200,
1ab1457c 2491 .proc_handler = &ipv6_sysctl_rtcache_flush
1da177e4
LT		 2492 },
2493 {
2494 .ctl_name = NET_IPV6_ROUTE_GC_THRESH,
2495 .procname = "gc_thresh",
9a7ec3a9 2496 .data = &ip6_dst_ops_template.gc_thresh,
1da177e4
LT		 2497 .maxlen = sizeof(int),
2498 .mode = 0644,
1ab1457c 2499 .proc_handler = &proc_dointvec,
1da177e4
LT		 2500 },
2501 {
2502 .ctl_name = NET_IPV6_ROUTE_MAX_SIZE,
2503 .procname = "max_size",
4990509f 2504 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
1da177e4
LT		 2505 .maxlen = sizeof(int),
2506 .mode = 0644,
1ab1457c 2507 .proc_handler = &proc_dointvec,
1da177e4
LT		 2508 },
2509 {
2510 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL,
2511 .procname = "gc_min_interval",
4990509f 2512 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 2513 .maxlen = sizeof(int),
2514 .mode = 0644,
1ab1457c 2515 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 2516 .strategy = &sysctl_jiffies,
2517 },
2518 {
2519 .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT,
2520 .procname = "gc_timeout",
4990509f 2521 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
1da177e4
LT		 2522 .maxlen = sizeof(int),
2523 .mode = 0644,
1ab1457c 2524 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 2525 .strategy = &sysctl_jiffies,
2526 },
2527 {
2528 .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL,
2529 .procname = "gc_interval",
4990509f 2530 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
1da177e4
LT		 2531 .maxlen = sizeof(int),
2532 .mode = 0644,
1ab1457c 2533 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 2534 .strategy = &sysctl_jiffies,
2535 },
2536 {
2537 .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY,
2538 .procname = "gc_elasticity",
4990509f 2539 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
1da177e4
LT		 2540 .maxlen = sizeof(int),
2541 .mode = 0644,
1ab1457c 2542 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 2543 .strategy = &sysctl_jiffies,
2544 },
2545 {
2546 .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES,
2547 .procname = "mtu_expires",
4990509f 2548 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
1da177e4
LT		 2549 .maxlen = sizeof(int),
2550 .mode = 0644,
1ab1457c 2551 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 2552 .strategy = &sysctl_jiffies,
2553 },
2554 {
2555 .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS,
2556 .procname = "min_adv_mss",
4990509f 2557 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
1da177e4
LT		 2558 .maxlen = sizeof(int),
2559 .mode = 0644,
1ab1457c 2560 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 2561 .strategy = &sysctl_jiffies,
2562 },
2563 {
2564 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
2565 .procname = "gc_min_interval_ms",
4990509f 2566 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
1da177e4
LT		 2567 .maxlen = sizeof(int),
2568 .mode = 0644,
1ab1457c 2569 .proc_handler = &proc_dointvec_ms_jiffies,
1da177e4
LT		 2570 .strategy = &sysctl_ms_jiffies,
2571 },
2572 { .ctl_name = 0 }
2573};
2574
760f2d01
DL		 2575struct ctl_table *ipv6_route_sysctl_init(struct net *net)
2576{
2577 struct ctl_table *table;
2578
2579 table = kmemdup(ipv6_route_table_template,
2580 sizeof(ipv6_route_table_template),
2581 GFP_KERNEL);
5ee09105
YH		 2582
2583 if (table) {
2584 table[0].data = &net->ipv6.sysctl.flush_delay;
f2fc6a54 2585 table[1].data = &net->ipv6.ip6_dst_ops->gc_thresh;
5ee09105
YH		 2586 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2587 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2588 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2589 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2590 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2591 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2592 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2593 }
2594
760f2d01
DL		 2595 return table;
2596}
1da177e4
LT		 2597#endif
2598
cdb18761
DL		 2599static int ip6_route_net_init(struct net *net)
2600{
8ed67789
DL		 2601 int ret = 0;
2602
2603 ret = -ENOMEM;
f2fc6a54
BT		 2604 net->ipv6.ip6_dst_ops = kmemdup(&ip6_dst_ops_template,
2605 sizeof(*net->ipv6.ip6_dst_ops),
2606 GFP_KERNEL);
2607 if (!net->ipv6.ip6_dst_ops)
2608 goto out;
2609 net->ipv6.ip6_dst_ops->dst_net = net;
2610
8ed67789
DL		 2611 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2612 sizeof(*net->ipv6.ip6_null_entry),
2613 GFP_KERNEL);
2614 if (!net->ipv6.ip6_null_entry)
f2fc6a54 2615 goto out_ip6_dst_ops;
8ed67789
DL		 2616 net->ipv6.ip6_null_entry->u.dst.path =
2617 (struct dst_entry *)net->ipv6.ip6_null_entry;
f2fc6a54 2618 net->ipv6.ip6_null_entry->u.dst.ops = net->ipv6.ip6_dst_ops;
8ed67789
DL		 2619
2620#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2621 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2622 sizeof(*net->ipv6.ip6_prohibit_entry),
2623 GFP_KERNEL);
2624 if (!net->ipv6.ip6_prohibit_entry) {
2625 kfree(net->ipv6.ip6_null_entry);
2626 goto out;
2627 }
2628 net->ipv6.ip6_prohibit_entry->u.dst.path =
2629 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
f2fc6a54 2630 net->ipv6.ip6_prohibit_entry->u.dst.ops = net->ipv6.ip6_dst_ops;
8ed67789
DL		 2631
2632 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
2633 sizeof(*net->ipv6.ip6_blk_hole_entry),
2634 GFP_KERNEL);
2635 if (!net->ipv6.ip6_blk_hole_entry) {
2636 kfree(net->ipv6.ip6_null_entry);
2637 kfree(net->ipv6.ip6_prohibit_entry);
2638 goto out;
2639 }
2640 net->ipv6.ip6_blk_hole_entry->u.dst.path =
2641 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
f2fc6a54 2642 net->ipv6.ip6_blk_hole_entry->u.dst.ops = net->ipv6.ip6_dst_ops;
8ed67789
DL		 2643#endif
2644
cdb18761
DL		 2645#ifdef CONFIG_PROC_FS
2646 proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
2647 proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
2648#endif
6891a346
BT		 2649 net->ipv6.ip6_rt_gc_expire = 30*HZ;
2650
8ed67789
DL		 2651 ret = 0;
2652out:
2653 return ret;
f2fc6a54
BT		 2654
2655out_ip6_dst_ops:
2656 kfree(net->ipv6.ip6_dst_ops);
2657 goto out;
cdb18761
DL		 2658}
2659
2660static void ip6_route_net_exit(struct net *net)
2661{
2662#ifdef CONFIG_PROC_FS
2663 proc_net_remove(net, "ipv6_route");
2664 proc_net_remove(net, "rt6_stats");
2665#endif
8ed67789
DL		 2666 kfree(net->ipv6.ip6_null_entry);
2667#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2668 kfree(net->ipv6.ip6_prohibit_entry);
2669 kfree(net->ipv6.ip6_blk_hole_entry);
2670#endif
f2fc6a54 2671 kfree(net->ipv6.ip6_dst_ops);
cdb18761
DL		 2672}
2673
2674static struct pernet_operations ip6_route_net_ops = {
2675 .init = ip6_route_net_init,
2676 .exit = ip6_route_net_exit,
2677};
2678
8ed67789
DL		 2679static struct notifier_block ip6_route_dev_notifier = {
2680 .notifier_call = ip6_route_dev_notify,
2681 .priority = 0,
2682};
2683
433d49c3 2684int __init ip6_route_init(void)
1da177e4 2685{
433d49c3
DL		 2686 int ret;
2687
9a7ec3a9
DL		 2688 ret = -ENOMEM;
2689 ip6_dst_ops_template.kmem_cachep =
e5d679f3 2690 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
f845ab6b 2691 SLAB_HWCACHE_ALIGN, NULL);
9a7ec3a9 2692 if (!ip6_dst_ops_template.kmem_cachep)
f2fc6a54 2693 goto out;;
14e50e57 2694
8ed67789
DL		 2695 ret = register_pernet_subsys(&ip6_route_net_ops);
2696 if (ret)
bdb3289f 2697 goto out_kmem_cache;
bdb3289f 2698
8ed67789
DL		 2699 /* Registering of the loopback is done before this portion of code,
2700 * the loopback reference in rt6_info will not be taken, do it
2701 * manually for init_net */
2702 init_net.ipv6.ip6_null_entry->u.dst.dev = init_net.loopback_dev;
2703 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
2704 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2705 init_net.ipv6.ip6_prohibit_entry->u.dst.dev = init_net.loopback_dev;
2706 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
2707 init_net.ipv6.ip6_blk_hole_entry->u.dst.dev = init_net.loopback_dev;
2708 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
2709 #endif
433d49c3
DL		 2710 ret = fib6_init();
2711 if (ret)
8ed67789 2712 goto out_register_subsys;
433d49c3 2713
433d49c3
DL		 2714 ret = xfrm6_init();
2715 if (ret)
cdb18761 2716 goto out_fib6_init;
c35b7e72 2717
433d49c3
DL		 2718 ret = fib6_rules_init();
2719 if (ret)
2720 goto xfrm6_init;
7e5449c2 2721
433d49c3
DL		 2722 ret = -ENOBUFS;
2723 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) ||
2724 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) ||
2725 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL))
2726 goto fib6_rules_init;
c127ea2c 2727
8ed67789 2728 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
cdb18761
DL		 2729 if (ret)
2730 goto fib6_rules_init;
8ed67789 2731
433d49c3
DL		 2732out:
2733 return ret;
2734
2735fib6_rules_init:
433d49c3
DL		 2736 fib6_rules_cleanup();
2737xfrm6_init:
433d49c3 2738 xfrm6_fini();
433d49c3 2739out_fib6_init:
433d49c3 2740 fib6_gc_cleanup();
8ed67789
DL		 2741out_register_subsys:
2742 unregister_pernet_subsys(&ip6_route_net_ops);
433d49c3 2743out_kmem_cache:
f2fc6a54 2744 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
433d49c3 2745 goto out;
1da177e4
LT		 2746}
2747
2748void ip6_route_cleanup(void)
2749{
8ed67789 2750 unregister_netdevice_notifier(&ip6_route_dev_notifier);
101367c2 2751 fib6_rules_cleanup();
1da177e4 2752 xfrm6_fini();
1da177e4 2753 fib6_gc_cleanup();
8ed67789 2754 unregister_pernet_subsys(&ip6_route_net_ops);
f2fc6a54 2755 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
1da177e4 2756}
kernel source for telekom puls (alcatel/mediatek)