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[IPv6] route: Simplify ip6_del_rt()
[net-next-2.6.git] / net / ipv6 / route.c
CommitLineData
1da177e4
LT		 1/*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
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.
25 */
26
4fc268d2 27#include <linux/capability.h>
1da177e4
LT		 28#include <linux/errno.h>
29#include <linux/types.h>
30#include <linux/times.h>
31#include <linux/socket.h>
32#include <linux/sockios.h>
33#include <linux/net.h>
34#include <linux/route.h>
35#include <linux/netdevice.h>
36#include <linux/in6.h>
37#include <linux/init.h>
1da177e4
LT		 38#include <linux/if_arp.h>
39
40#ifdef CONFIG_PROC_FS
41#include <linux/proc_fs.h>
42#include <linux/seq_file.h>
43#endif
44
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
554cfb7e
YH		 77#define RT6_SELECT_F_IFACE 0x1
78#define RT6_SELECT_F_REACHABLE 0x2
79
1da177e4
LT		 80static int ip6_rt_max_size = 4096;
81static int ip6_rt_gc_min_interval = HZ / 2;
82static int ip6_rt_gc_timeout = 60*HZ;
83int ip6_rt_gc_interval = 30*HZ;
84static int ip6_rt_gc_elasticity = 9;
85static int ip6_rt_mtu_expires = 10*60*HZ;
86static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
87
88static struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
89static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
90static struct dst_entry *ip6_negative_advice(struct dst_entry *);
91static void ip6_dst_destroy(struct dst_entry *);
92static void ip6_dst_ifdown(struct dst_entry *,
93 struct net_device *dev, int how);
94static int ip6_dst_gc(void);
95
96static int ip6_pkt_discard(struct sk_buff *skb);
97static int ip6_pkt_discard_out(struct sk_buff *skb);
98static void ip6_link_failure(struct sk_buff *skb);
99static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
100
70ceb4f5
YH		 101#ifdef CONFIG_IPV6_ROUTE_INFO
102static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
103 struct in6_addr *gwaddr, int ifindex,
104 unsigned pref);
105static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
106 struct in6_addr *gwaddr, int ifindex);
107#endif
108
1da177e4
LT		 109static struct dst_ops ip6_dst_ops = {
110 .family = AF_INET6,
111 .protocol = __constant_htons(ETH_P_IPV6),
112 .gc = ip6_dst_gc,
113 .gc_thresh = 1024,
114 .check = ip6_dst_check,
115 .destroy = ip6_dst_destroy,
116 .ifdown = ip6_dst_ifdown,
117 .negative_advice = ip6_negative_advice,
118 .link_failure = ip6_link_failure,
119 .update_pmtu = ip6_rt_update_pmtu,
120 .entry_size = sizeof(struct rt6_info),
121};
122
123struct rt6_info ip6_null_entry = {
124 .u = {
125 .dst = {
126 .__refcnt = ATOMIC_INIT(1),
127 .__use = 1,
128 .dev = &loopback_dev,
129 .obsolete = -1,
130 .error = -ENETUNREACH,
131 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
132 .input = ip6_pkt_discard,
133 .output = ip6_pkt_discard_out,
134 .ops = &ip6_dst_ops,
135 .path = (struct dst_entry*)&ip6_null_entry,
136 }
137 },
138 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
139 .rt6i_metric = ~(u32) 0,
140 .rt6i_ref = ATOMIC_INIT(1),
141};
142
101367c2
TG		 143#ifdef CONFIG_IPV6_MULTIPLE_TABLES
144
145struct rt6_info ip6_prohibit_entry = {
146 .u = {
147 .dst = {
148 .__refcnt = ATOMIC_INIT(1),
149 .__use = 1,
150 .dev = &loopback_dev,
151 .obsolete = -1,
152 .error = -EACCES,
153 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
154 .input = ip6_pkt_discard,
155 .output = ip6_pkt_discard_out,
156 .ops = &ip6_dst_ops,
157 .path = (struct dst_entry*)&ip6_prohibit_entry,
158 }
159 },
160 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
161 .rt6i_metric = ~(u32) 0,
162 .rt6i_ref = ATOMIC_INIT(1),
163};
164
165struct rt6_info ip6_blk_hole_entry = {
166 .u = {
167 .dst = {
168 .__refcnt = ATOMIC_INIT(1),
169 .__use = 1,
170 .dev = &loopback_dev,
171 .obsolete = -1,
172 .error = -EINVAL,
173 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
174 .input = ip6_pkt_discard,
175 .output = ip6_pkt_discard_out,
176 .ops = &ip6_dst_ops,
177 .path = (struct dst_entry*)&ip6_blk_hole_entry,
178 }
179 },
180 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
181 .rt6i_metric = ~(u32) 0,
182 .rt6i_ref = ATOMIC_INIT(1),
183};
184
185#endif
186
1da177e4
LT		 187/* allocate dst with ip6_dst_ops */
188static __inline__ struct rt6_info *ip6_dst_alloc(void)
189{
190 return (struct rt6_info *)dst_alloc(&ip6_dst_ops);
191}
192
193static void ip6_dst_destroy(struct dst_entry *dst)
194{
195 struct rt6_info *rt = (struct rt6_info *)dst;
196 struct inet6_dev *idev = rt->rt6i_idev;
197
198 if (idev != NULL) {
199 rt->rt6i_idev = NULL;
200 in6_dev_put(idev);
201 }
202}
203
204static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
205 int how)
206{
207 struct rt6_info *rt = (struct rt6_info *)dst;
208 struct inet6_dev *idev = rt->rt6i_idev;
209
210 if (dev != &loopback_dev && idev != NULL && idev->dev == dev) {
211 struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
212 if (loopback_idev != NULL) {
213 rt->rt6i_idev = loopback_idev;
214 in6_dev_put(idev);
215 }
216 }
217}
218
219static __inline__ int rt6_check_expired(const struct rt6_info *rt)
220{
221 return (rt->rt6i_flags & RTF_EXPIRES &&
222 time_after(jiffies, rt->rt6i_expires));
223}
224
c71099ac
TG		 225static inline int rt6_need_strict(struct in6_addr *daddr)
226{
227 return (ipv6_addr_type(daddr) &
228 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
229}
230
1da177e4 231/*
c71099ac 232 * Route lookup. Any table->tb6_lock is implied.
1da177e4
LT		 233 */
234
235static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt,
236 int oif,
237 int strict)
238{
239 struct rt6_info *local = NULL;
240 struct rt6_info *sprt;
241
242 if (oif) {
243 for (sprt = rt; sprt; sprt = sprt->u.next) {
244 struct net_device *dev = sprt->rt6i_dev;
245 if (dev->ifindex == oif)
246 return sprt;
247 if (dev->flags & IFF_LOOPBACK) {
248 if (sprt->rt6i_idev == NULL ||
249 sprt->rt6i_idev->dev->ifindex != oif) {
250 if (strict && oif)
251 continue;
252 if (local && (!oif ||
253 local->rt6i_idev->dev->ifindex == oif))
254 continue;
255 }
256 local = sprt;
257 }
258 }
259
260 if (local)
261 return local;
262
263 if (strict)
264 return &ip6_null_entry;
265 }
266 return rt;
267}
268
27097255
YH		 269#ifdef CONFIG_IPV6_ROUTER_PREF
270static void rt6_probe(struct rt6_info *rt)
271{
272 struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL;
273 /*
274 * Okay, this does not seem to be appropriate
275 * for now, however, we need to check if it
276 * is really so; aka Router Reachability Probing.
277 *
278 * Router Reachability Probe MUST be rate-limited
279 * to no more than one per minute.
280 */
281 if (!neigh || (neigh->nud_state & NUD_VALID))
282 return;
283 read_lock_bh(&neigh->lock);
284 if (!(neigh->nud_state & NUD_VALID) &&
52e16356 285 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
27097255
YH		 286 struct in6_addr mcaddr;
287 struct in6_addr *target;
288
289 neigh->updated = jiffies;
290 read_unlock_bh(&neigh->lock);
291
292 target = (struct in6_addr *)&neigh->primary_key;
293 addrconf_addr_solict_mult(target, &mcaddr);
294 ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL);
295 } else
296 read_unlock_bh(&neigh->lock);
297}
298#else
299static inline void rt6_probe(struct rt6_info *rt)
300{
301 return;
302}
303#endif
304
1da177e4 305/*
554cfb7e 306 * Default Router Selection (RFC 2461 6.3.6)
1da177e4 307 */
554cfb7e
YH		 308static int inline rt6_check_dev(struct rt6_info *rt, int oif)
309{
310 struct net_device *dev = rt->rt6i_dev;
311 if (!oif || dev->ifindex == oif)
312 return 2;
313 if ((dev->flags & IFF_LOOPBACK) &&
314 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
315 return 1;
316 return 0;
317}
1da177e4 318
554cfb7e 319static int inline rt6_check_neigh(struct rt6_info *rt)
1da177e4 320{
554cfb7e
YH		 321 struct neighbour *neigh = rt->rt6i_nexthop;
322 int m = 0;
4d0c5911
YH		 323 if (rt->rt6i_flags & RTF_NONEXTHOP ||
324 !(rt->rt6i_flags & RTF_GATEWAY))
325 m = 1;
326 else if (neigh) {
554cfb7e
YH		 327 read_lock_bh(&neigh->lock);
328 if (neigh->nud_state & NUD_VALID)
4d0c5911 329 m = 2;
554cfb7e 330 read_unlock_bh(&neigh->lock);
1da177e4 331 }
554cfb7e 332 return m;
1da177e4
LT		 333}
334
554cfb7e
YH		 335static int rt6_score_route(struct rt6_info *rt, int oif,
336 int strict)
1da177e4 337{
4d0c5911
YH		 338 int m, n;
339
340 m = rt6_check_dev(rt, oif);
554cfb7e
YH		 341 if (!m && (strict & RT6_SELECT_F_IFACE))
342 return -1;
ebacaaa0
YH		 343#ifdef CONFIG_IPV6_ROUTER_PREF
344 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
345#endif
4d0c5911
YH		 346 n = rt6_check_neigh(rt);
347 if (n > 1)
ebacaaa0 348 m |= 16;
4d0c5911 349 else if (!n && strict & RT6_SELECT_F_REACHABLE)
554cfb7e
YH		 350 return -1;
351 return m;
352}
353
354static struct rt6_info *rt6_select(struct rt6_info **head, int oif,
355 int strict)
356{
357 struct rt6_info *match = NULL, *last = NULL;
358 struct rt6_info *rt, *rt0 = *head;
359 u32 metric;
360 int mpri = -1;
1da177e4 361
554cfb7e
YH		 362 RT6_TRACE("%s(head=%p(*head=%p), oif=%d)\n",
363 __FUNCTION__, head, head ? *head : NULL, oif);
1da177e4 364
554cfb7e 365 for (rt = rt0, metric = rt0->rt6i_metric;
c302e6d5 366 rt && rt->rt6i_metric == metric && (!last || rt != rt0);
554cfb7e
YH		 367 rt = rt->u.next) {
368 int m;
1da177e4 369
554cfb7e 370 if (rt6_check_expired(rt))
1da177e4
LT		 371 continue;
372
554cfb7e
YH		 373 last = rt;
374
375 m = rt6_score_route(rt, oif, strict);
376 if (m < 0)
1da177e4 377 continue;
1da177e4 378
554cfb7e 379 if (m > mpri) {
27097255 380 rt6_probe(match);
554cfb7e 381 match = rt;
1da177e4 382 mpri = m;
27097255
YH		 383 } else {
384 rt6_probe(rt);
1da177e4
LT		 385 }
386 }
387
554cfb7e
YH		 388 if (!match &&
389 (strict & RT6_SELECT_F_REACHABLE) &&
390 last && last != rt0) {
391 /* no entries matched; do round-robin */
34af946a 392 static DEFINE_SPINLOCK(lock);
c302e6d5 393 spin_lock(&lock);
554cfb7e
YH		 394 *head = rt0->u.next;
395 rt0->u.next = last->u.next;
396 last->u.next = rt0;
c302e6d5 397 spin_unlock(&lock);
1da177e4 398 }
1da177e4 399
554cfb7e
YH		 400 RT6_TRACE("%s() => %p, score=%d\n",
401 __FUNCTION__, match, mpri);
1da177e4 402
554cfb7e 403 return (match ? match : &ip6_null_entry);
1da177e4
LT		 404}
405
70ceb4f5
YH		 406#ifdef CONFIG_IPV6_ROUTE_INFO
407int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
408 struct in6_addr *gwaddr)
409{
410 struct route_info *rinfo = (struct route_info *) opt;
411 struct in6_addr prefix_buf, *prefix;
412 unsigned int pref;
413 u32 lifetime;
414 struct rt6_info *rt;
415
416 if (len < sizeof(struct route_info)) {
417 return -EINVAL;
418 }
419
420 /* Sanity check for prefix_len and length */
421 if (rinfo->length > 3) {
422 return -EINVAL;
423 } else if (rinfo->prefix_len > 128) {
424 return -EINVAL;
425 } else if (rinfo->prefix_len > 64) {
426 if (rinfo->length < 2) {
427 return -EINVAL;
428 }
429 } else if (rinfo->prefix_len > 0) {
430 if (rinfo->length < 1) {
431 return -EINVAL;
432 }
433 }
434
435 pref = rinfo->route_pref;
436 if (pref == ICMPV6_ROUTER_PREF_INVALID)
437 pref = ICMPV6_ROUTER_PREF_MEDIUM;
438
439 lifetime = htonl(rinfo->lifetime);
440 if (lifetime == 0xffffffff) {
441 /* infinity */
442 } else if (lifetime > 0x7fffffff/HZ) {
443 /* Avoid arithmetic overflow */
444 lifetime = 0x7fffffff/HZ - 1;
445 }
446
447 if (rinfo->length == 3)
448 prefix = (struct in6_addr *)rinfo->prefix;
449 else {
450 /* this function is safe */
451 ipv6_addr_prefix(&prefix_buf,
452 (struct in6_addr *)rinfo->prefix,
453 rinfo->prefix_len);
454 prefix = &prefix_buf;
455 }
456
457 rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex);
458
459 if (rt && !lifetime) {
e0a1ad73 460 ip6_del_rt(rt);
70ceb4f5
YH		 461 rt = NULL;
462 }
463
464 if (!rt && lifetime)
465 rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
466 pref);
467 else if (rt)
468 rt->rt6i_flags = RTF_ROUTEINFO |
469 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
470
471 if (rt) {
472 if (lifetime == 0xffffffff) {
473 rt->rt6i_flags &= ~RTF_EXPIRES;
474 } else {
475 rt->rt6i_expires = jiffies + HZ * lifetime;
476 rt->rt6i_flags |= RTF_EXPIRES;
477 }
478 dst_release(&rt->u.dst);
479 }
480 return 0;
481}
482#endif
483
c71099ac
TG		 484#define BACKTRACK() \
485if (rt == &ip6_null_entry && flags & RT6_F_STRICT) { \
486 while ((fn = fn->parent) != NULL) { \
487 if (fn->fn_flags & RTN_TL_ROOT) { \
488 dst_hold(&rt->u.dst); \
489 goto out; \
490 } \
491 if (fn->fn_flags & RTN_RTINFO) \
492 goto restart; \
493 } \
494}
495
496static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table,
497 struct flowi *fl, int flags)
1da177e4
LT		 498{
499 struct fib6_node *fn;
500 struct rt6_info *rt;
501
c71099ac
TG		 502 read_lock_bh(&table->tb6_lock);
503 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
504restart:
505 rt = fn->leaf;
506 rt = rt6_device_match(rt, fl->oif, flags & RT6_F_STRICT);
507 BACKTRACK();
1da177e4 508 dst_hold(&rt->u.dst);
c71099ac
TG		 509out:
510 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 511
512 rt->u.dst.lastuse = jiffies;
c71099ac
TG		 513 rt->u.dst.__use++;
514
515 return rt;
516
517}
518
519struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
520 int oif, int strict)
521{
522 struct flowi fl = {
523 .oif = oif,
524 .nl_u = {
525 .ip6_u = {
526 .daddr = *daddr,
527 /* TODO: saddr */
528 },
529 },
530 };
531 struct dst_entry *dst;
532 int flags = strict ? RT6_F_STRICT : 0;
533
534 dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup);
535 if (dst->error == 0)
536 return (struct rt6_info *) dst;
537
538 dst_release(dst);
539
1da177e4
LT		 540 return NULL;
541}
542
c71099ac 543/* ip6_ins_rt is called with FREE table->tb6_lock.
1da177e4
LT		 544 It takes new route entry, the addition fails by any reason the
545 route is freed. In any case, if caller does not hold it, it may
546 be destroyed.
547 */
548
0d51aa80
JHS		 549int ip6_ins_rt(struct rt6_info *rt, struct nlmsghdr *nlh,
550 void *_rtattr, struct netlink_skb_parms *req)
1da177e4
LT		 551{
552 int err;
c71099ac 553 struct fib6_table *table;
1da177e4 554
c71099ac
TG		 555 table = rt->rt6i_table;
556 write_lock_bh(&table->tb6_lock);
557 err = fib6_add(&table->tb6_root, rt, nlh, _rtattr, req);
558 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 559
560 return err;
561}
562
95a9a5ba
YH		 563static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
564 struct in6_addr *saddr)
1da177e4 565{
1da177e4
LT		 566 struct rt6_info *rt;
567
568 /*
569 * Clone the route.
570 */
571
572 rt = ip6_rt_copy(ort);
573
574 if (rt) {
58c4fb86
YH		 575 if (!(rt->rt6i_flags&RTF_GATEWAY)) {
576 if (rt->rt6i_dst.plen != 128 &&
577 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr))
578 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 579 ipv6_addr_copy(&rt->rt6i_gateway, daddr);
58c4fb86 580 }
1da177e4 581
58c4fb86 582 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
1da177e4
LT		 583 rt->rt6i_dst.plen = 128;
584 rt->rt6i_flags |= RTF_CACHE;
585 rt->u.dst.flags |= DST_HOST;
586
587#ifdef CONFIG_IPV6_SUBTREES
588 if (rt->rt6i_src.plen && saddr) {
589 ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
590 rt->rt6i_src.plen = 128;
591 }
592#endif
593
594 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
595
95a9a5ba 596 }
1da177e4 597
95a9a5ba
YH		 598 return rt;
599}
1da177e4 600
299d9939
YH		 601static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr)
602{
603 struct rt6_info *rt = ip6_rt_copy(ort);
604 if (rt) {
605 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
606 rt->rt6i_dst.plen = 128;
607 rt->rt6i_flags |= RTF_CACHE;
608 if (rt->rt6i_flags & RTF_REJECT)
609 rt->u.dst.error = ort->u.dst.error;
610 rt->u.dst.flags |= DST_HOST;
611 rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
612 }
613 return rt;
614}
615
8ce11e6a
AB		 616static struct rt6_info *ip6_pol_route_input(struct fib6_table *table,
617 struct flowi *fl, int flags)
1da177e4
LT		 618{
619 struct fib6_node *fn;
519fbd87 620 struct rt6_info *rt, *nrt;
c71099ac 621 int strict = 0;
1da177e4 622 int attempts = 3;
519fbd87 623 int err;
8238dd06 624 int reachable = RT6_SELECT_F_REACHABLE;
1da177e4 625
c71099ac
TG		 626 if (flags & RT6_F_STRICT)
627 strict = RT6_SELECT_F_IFACE;
1da177e4
LT		 628
629relookup:
c71099ac 630 read_lock_bh(&table->tb6_lock);
1da177e4 631
8238dd06 632restart_2:
c71099ac 633 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1da177e4
LT		 634
635restart:
c71099ac 636 rt = rt6_select(&fn->leaf, fl->iif, strict | reachable);
1da177e4 637 BACKTRACK();
8238dd06
YH		 638 if (rt == &ip6_null_entry ||
639 rt->rt6i_flags & RTF_CACHE)
1ddef044 640 goto out;
1da177e4 641
fb9de91e 642 dst_hold(&rt->u.dst);
c71099ac 643 read_unlock_bh(&table->tb6_lock);
fb9de91e 644
519fbd87 645 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
c71099ac 646 nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
519fbd87
YH		 647 else {
648#if CLONE_OFFLINK_ROUTE
c71099ac 649 nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
519fbd87
YH		 650#else
651 goto out2;
652#endif
653 }
e40cf353 654
519fbd87
YH		 655 dst_release(&rt->u.dst);
656 rt = nrt ? : &ip6_null_entry;
1da177e4 657
519fbd87
YH		 658 dst_hold(&rt->u.dst);
659 if (nrt) {
c71099ac 660 err = ip6_ins_rt(nrt, NULL, NULL, NULL);
519fbd87 661 if (!err)
1da177e4 662 goto out2;
1da177e4 663 }
1da177e4 664
519fbd87
YH		 665 if (--attempts <= 0)
666 goto out2;
667
668 /*
c71099ac 669 * Race condition! In the gap, when table->tb6_lock was
519fbd87
YH		 670 * released someone could insert this route. Relookup.
671 */
672 dst_release(&rt->u.dst);
673 goto relookup;
674
675out:
8238dd06
YH		 676 if (reachable) {
677 reachable = 0;
678 goto restart_2;
679 }
519fbd87 680 dst_hold(&rt->u.dst);
c71099ac 681 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 682out2:
683 rt->u.dst.lastuse = jiffies;
684 rt->u.dst.__use++;
c71099ac
TG		 685
686 return rt;
1da177e4
LT		 687}
688
c71099ac
TG		 689void ip6_route_input(struct sk_buff *skb)
690{
691 struct ipv6hdr *iph = skb->nh.ipv6h;
692 struct flowi fl = {
693 .iif = skb->dev->ifindex,
694 .nl_u = {
695 .ip6_u = {
696 .daddr = iph->daddr,
697 .saddr = iph->saddr,
698 .flowlabel = (* (u32 *) iph)&IPV6_FLOWINFO_MASK,
699 },
700 },
701 .proto = iph->nexthdr,
702 };
703 int flags = 0;
704
705 if (rt6_need_strict(&iph->daddr))
706 flags |= RT6_F_STRICT;
707
708 skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input);
709}
710
711static struct rt6_info *ip6_pol_route_output(struct fib6_table *table,
712 struct flowi *fl, int flags)
1da177e4
LT		 713{
714 struct fib6_node *fn;
519fbd87 715 struct rt6_info *rt, *nrt;
c71099ac 716 int strict = 0;
1da177e4 717 int attempts = 3;
519fbd87 718 int err;
8238dd06 719 int reachable = RT6_SELECT_F_REACHABLE;
1da177e4 720
c71099ac
TG		 721 if (flags & RT6_F_STRICT)
722 strict = RT6_SELECT_F_IFACE;
1da177e4
LT		 723
724relookup:
c71099ac 725 read_lock_bh(&table->tb6_lock);
1da177e4 726
8238dd06 727restart_2:
c71099ac 728 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1da177e4
LT		 729
730restart:
8238dd06 731 rt = rt6_select(&fn->leaf, fl->oif, strict | reachable);
1ddef044 732 BACKTRACK();
8238dd06
YH		 733 if (rt == &ip6_null_entry ||
734 rt->rt6i_flags & RTF_CACHE)
1da177e4 735 goto out;
1da177e4 736
fb9de91e 737 dst_hold(&rt->u.dst);
c71099ac 738 read_unlock_bh(&table->tb6_lock);
fb9de91e 739
519fbd87 740 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
e40cf353 741 nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
519fbd87
YH		 742 else {
743#if CLONE_OFFLINK_ROUTE
744 nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
745#else
746 goto out2;
747#endif
748 }
1da177e4 749
519fbd87
YH		 750 dst_release(&rt->u.dst);
751 rt = nrt ? : &ip6_null_entry;
1da177e4 752
519fbd87
YH		 753 dst_hold(&rt->u.dst);
754 if (nrt) {
755 err = ip6_ins_rt(nrt, NULL, NULL, NULL);
756 if (!err)
1da177e4 757 goto out2;
1da177e4 758 }
e40cf353 759
519fbd87
YH		 760 if (--attempts <= 0)
761 goto out2;
762
763 /*
c71099ac 764 * Race condition! In the gap, when table->tb6_lock was
519fbd87
YH		 765 * released someone could insert this route. Relookup.
766 */
767 dst_release(&rt->u.dst);
768 goto relookup;
769
770out:
8238dd06
YH		 771 if (reachable) {
772 reachable = 0;
773 goto restart_2;
774 }
519fbd87 775 dst_hold(&rt->u.dst);
c71099ac 776 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 777out2:
778 rt->u.dst.lastuse = jiffies;
779 rt->u.dst.__use++;
c71099ac
TG		 780 return rt;
781}
782
783struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
784{
785 int flags = 0;
786
787 if (rt6_need_strict(&fl->fl6_dst))
788 flags |= RT6_F_STRICT;
789
790 return fib6_rule_lookup(fl, flags, ip6_pol_route_output);
1da177e4
LT		 791}
792
793
794/*
795 * Destination cache support functions
796 */
797
798static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
799{
800 struct rt6_info *rt;
801
802 rt = (struct rt6_info *) dst;
803
804 if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
805 return dst;
806
807 return NULL;
808}
809
810static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
811{
812 struct rt6_info *rt = (struct rt6_info *) dst;
813
814 if (rt) {
815 if (rt->rt6i_flags & RTF_CACHE)
e0a1ad73 816 ip6_del_rt(rt);
1da177e4
LT		 817 else
818 dst_release(dst);
819 }
820 return NULL;
821}
822
823static void ip6_link_failure(struct sk_buff *skb)
824{
825 struct rt6_info *rt;
826
827 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
828
829 rt = (struct rt6_info *) skb->dst;
830 if (rt) {
831 if (rt->rt6i_flags&RTF_CACHE) {
832 dst_set_expires(&rt->u.dst, 0);
833 rt->rt6i_flags |= RTF_EXPIRES;
834 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
835 rt->rt6i_node->fn_sernum = -1;
836 }
837}
838
839static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
840{
841 struct rt6_info *rt6 = (struct rt6_info*)dst;
842
843 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
844 rt6->rt6i_flags |= RTF_MODIFIED;
845 if (mtu < IPV6_MIN_MTU) {
846 mtu = IPV6_MIN_MTU;
847 dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
848 }
849 dst->metrics[RTAX_MTU-1] = mtu;
8d71740c 850 call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
1da177e4
LT		 851 }
852}
853
1da177e4
LT		 854static int ipv6_get_mtu(struct net_device *dev);
855
856static inline unsigned int ipv6_advmss(unsigned int mtu)
857{
858 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
859
860 if (mtu < ip6_rt_min_advmss)
861 mtu = ip6_rt_min_advmss;
862
863 /*
864 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
865 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
866 * IPV6_MAXPLEN is also valid and means: "any MSS,
867 * rely only on pmtu discovery"
868 */
869 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
870 mtu = IPV6_MAXPLEN;
871 return mtu;
872}
873
5d0bbeeb 874static struct dst_entry *ndisc_dst_gc_list;
8ce11e6a 875static DEFINE_SPINLOCK(ndisc_lock);
5d0bbeeb 876
1da177e4
LT		 877struct dst_entry *ndisc_dst_alloc(struct net_device *dev,
878 struct neighbour *neigh,
879 struct in6_addr *addr,
880 int (*output)(struct sk_buff *))
881{
882 struct rt6_info *rt;
883 struct inet6_dev *idev = in6_dev_get(dev);
884
885 if (unlikely(idev == NULL))
886 return NULL;
887
888 rt = ip6_dst_alloc();
889 if (unlikely(rt == NULL)) {
890 in6_dev_put(idev);
891 goto out;
892 }
893
894 dev_hold(dev);
895 if (neigh)
896 neigh_hold(neigh);
897 else
898 neigh = ndisc_get_neigh(dev, addr);
899
900 rt->rt6i_dev = dev;
901 rt->rt6i_idev = idev;
902 rt->rt6i_nexthop = neigh;
903 atomic_set(&rt->u.dst.__refcnt, 1);
904 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
905 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
906 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
907 rt->u.dst.output = output;
908
909#if 0 /* there's no chance to use these for ndisc */
910 rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
911 ? DST_HOST
912 : 0;
913 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
914 rt->rt6i_dst.plen = 128;
915#endif
916
5d0bbeeb 917 spin_lock_bh(&ndisc_lock);
1da177e4
LT		 918 rt->u.dst.next = ndisc_dst_gc_list;
919 ndisc_dst_gc_list = &rt->u.dst;
5d0bbeeb 920 spin_unlock_bh(&ndisc_lock);
1da177e4
LT		 921
922 fib6_force_start_gc();
923
924out:
925 return (struct dst_entry *)rt;
926}
927
928int ndisc_dst_gc(int *more)
929{
930 struct dst_entry *dst, *next, **pprev;
931 int freed;
932
933 next = NULL;
5d0bbeeb
TG		 934 freed = 0;
935
936 spin_lock_bh(&ndisc_lock);
1da177e4 937 pprev = &ndisc_dst_gc_list;
5d0bbeeb 938
1da177e4
LT		 939 while ((dst = *pprev) != NULL) {
940 if (!atomic_read(&dst->__refcnt)) {
941 *pprev = dst->next;
942 dst_free(dst);
943 freed++;
944 } else {
945 pprev = &dst->next;
946 (*more)++;
947 }
948 }
949
5d0bbeeb
TG		 950 spin_unlock_bh(&ndisc_lock);
951
1da177e4
LT		 952 return freed;
953}
954
955static int ip6_dst_gc(void)
956{
957 static unsigned expire = 30*HZ;
958 static unsigned long last_gc;
959 unsigned long now = jiffies;
960
961 if (time_after(last_gc + ip6_rt_gc_min_interval, now) &&
962 atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size)
963 goto out;
964
965 expire++;
966 fib6_run_gc(expire);
967 last_gc = now;
968 if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh)
969 expire = ip6_rt_gc_timeout>>1;
970
971out:
972 expire -= expire>>ip6_rt_gc_elasticity;
973 return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size);
974}
975
976/* Clean host part of a prefix. Not necessary in radix tree,
977 but results in cleaner routing tables.
978
979 Remove it only when all the things will work!
980 */
981
982static int ipv6_get_mtu(struct net_device *dev)
983{
984 int mtu = IPV6_MIN_MTU;
985 struct inet6_dev *idev;
986
987 idev = in6_dev_get(dev);
988 if (idev) {
989 mtu = idev->cnf.mtu6;
990 in6_dev_put(idev);
991 }
992 return mtu;
993}
994
995int ipv6_get_hoplimit(struct net_device *dev)
996{
997 int hoplimit = ipv6_devconf.hop_limit;
998 struct inet6_dev *idev;
999
1000 idev = in6_dev_get(dev);
1001 if (idev) {
1002 hoplimit = idev->cnf.hop_limit;
1003 in6_dev_put(idev);
1004 }
1005 return hoplimit;
1006}
1007
1008/*
1009 *
1010 */
1011
0d51aa80 1012int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh,
c71099ac
TG		 1013 void *_rtattr, struct netlink_skb_parms *req,
1014 u32 table_id)
1da177e4
LT		 1015{
1016 int err;
1017 struct rtmsg *r;
1018 struct rtattr **rta;
1019 struct rt6_info *rt = NULL;
1020 struct net_device *dev = NULL;
1021 struct inet6_dev *idev = NULL;
c71099ac 1022 struct fib6_table *table;
1da177e4
LT		 1023 int addr_type;
1024
1025 rta = (struct rtattr **) _rtattr;
1026
1027 if (rtmsg->rtmsg_dst_len > 128 || rtmsg->rtmsg_src_len > 128)
1028 return -EINVAL;
1029#ifndef CONFIG_IPV6_SUBTREES
1030 if (rtmsg->rtmsg_src_len)
1031 return -EINVAL;
1032#endif
1033 if (rtmsg->rtmsg_ifindex) {
1034 err = -ENODEV;
1035 dev = dev_get_by_index(rtmsg->rtmsg_ifindex);
1036 if (!dev)
1037 goto out;
1038 idev = in6_dev_get(dev);
1039 if (!idev)
1040 goto out;
1041 }
1042
1043 if (rtmsg->rtmsg_metric == 0)
1044 rtmsg->rtmsg_metric = IP6_RT_PRIO_USER;
1045
c71099ac
TG		 1046 table = fib6_new_table(table_id);
1047 if (table == NULL) {
1048 err = -ENOBUFS;
1049 goto out;
1050 }
1051
1da177e4
LT		 1052 rt = ip6_dst_alloc();
1053
1054 if (rt == NULL) {
1055 err = -ENOMEM;
1056 goto out;
1057 }
1058
1059 rt->u.dst.obsolete = -1;
3dd4bc68 1060 rt->rt6i_expires = jiffies + clock_t_to_jiffies(rtmsg->rtmsg_info);
1da177e4
LT		 1061 if (nlh && (r = NLMSG_DATA(nlh))) {
1062 rt->rt6i_protocol = r->rtm_protocol;
1063 } else {
1064 rt->rt6i_protocol = RTPROT_BOOT;
1065 }
1066
1067 addr_type = ipv6_addr_type(&rtmsg->rtmsg_dst);
1068
1069 if (addr_type & IPV6_ADDR_MULTICAST)
1070 rt->u.dst.input = ip6_mc_input;
1071 else
1072 rt->u.dst.input = ip6_forward;
1073
1074 rt->u.dst.output = ip6_output;
1075
1076 ipv6_addr_prefix(&rt->rt6i_dst.addr,
1077 &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len);
1078 rt->rt6i_dst.plen = rtmsg->rtmsg_dst_len;
1079 if (rt->rt6i_dst.plen == 128)
1080 rt->u.dst.flags = DST_HOST;
1081
1082#ifdef CONFIG_IPV6_SUBTREES
1083 ipv6_addr_prefix(&rt->rt6i_src.addr,
1084 &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len);
1085 rt->rt6i_src.plen = rtmsg->rtmsg_src_len;
1086#endif
1087
1088 rt->rt6i_metric = rtmsg->rtmsg_metric;
1089
1090 /* We cannot add true routes via loopback here,
1091 they would result in kernel looping; promote them to reject routes
1092 */
1093 if ((rtmsg->rtmsg_flags&RTF_REJECT) ||
1094 (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
1095 /* hold loopback dev/idev if we haven't done so. */
1096 if (dev != &loopback_dev) {
1097 if (dev) {
1098 dev_put(dev);
1099 in6_dev_put(idev);
1100 }
1101 dev = &loopback_dev;
1102 dev_hold(dev);
1103 idev = in6_dev_get(dev);
1104 if (!idev) {
1105 err = -ENODEV;
1106 goto out;
1107 }
1108 }
1109 rt->u.dst.output = ip6_pkt_discard_out;
1110 rt->u.dst.input = ip6_pkt_discard;
1111 rt->u.dst.error = -ENETUNREACH;
1112 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1113 goto install_route;
1114 }
1115
1116 if (rtmsg->rtmsg_flags & RTF_GATEWAY) {
1117 struct in6_addr *gw_addr;
1118 int gwa_type;
1119
1120 gw_addr = &rtmsg->rtmsg_gateway;
1121 ipv6_addr_copy(&rt->rt6i_gateway, &rtmsg->rtmsg_gateway);
1122 gwa_type = ipv6_addr_type(gw_addr);
1123
1124 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1125 struct rt6_info *grt;
1126
1127 /* IPv6 strictly inhibits using not link-local
1128 addresses as nexthop address.
1129 Otherwise, router will not able to send redirects.
1130 It is very good, but in some (rare!) circumstances
1131 (SIT, PtP, NBMA NOARP links) it is handy to allow
1132 some exceptions. --ANK
1133 */
1134 err = -EINVAL;
1135 if (!(gwa_type&IPV6_ADDR_UNICAST))
1136 goto out;
1137
1138 grt = rt6_lookup(gw_addr, NULL, rtmsg->rtmsg_ifindex, 1);
1139
1140 err = -EHOSTUNREACH;
1141 if (grt == NULL)
1142 goto out;
1143 if (dev) {
1144 if (dev != grt->rt6i_dev) {
1145 dst_release(&grt->u.dst);
1146 goto out;
1147 }
1148 } else {
1149 dev = grt->rt6i_dev;
1150 idev = grt->rt6i_idev;
1151 dev_hold(dev);
1152 in6_dev_hold(grt->rt6i_idev);
1153 }
1154 if (!(grt->rt6i_flags&RTF_GATEWAY))
1155 err = 0;
1156 dst_release(&grt->u.dst);
1157
1158 if (err)
1159 goto out;
1160 }
1161 err = -EINVAL;
1162 if (dev == NULL || (dev->flags&IFF_LOOPBACK))
1163 goto out;
1164 }
1165
1166 err = -ENODEV;
1167 if (dev == NULL)
1168 goto out;
1169
1170 if (rtmsg->rtmsg_flags & (RTF_GATEWAY|RTF_NONEXTHOP)) {
1171 rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
1172 if (IS_ERR(rt->rt6i_nexthop)) {
1173 err = PTR_ERR(rt->rt6i_nexthop);
1174 rt->rt6i_nexthop = NULL;
1175 goto out;
1176 }
1177 }
1178
1179 rt->rt6i_flags = rtmsg->rtmsg_flags;
1180
1181install_route:
1182 if (rta && rta[RTA_METRICS-1]) {
1183 int attrlen = RTA_PAYLOAD(rta[RTA_METRICS-1]);
1184 struct rtattr *attr = RTA_DATA(rta[RTA_METRICS-1]);
1185
1186 while (RTA_OK(attr, attrlen)) {
1187 unsigned flavor = attr->rta_type;
1188 if (flavor) {
1189 if (flavor > RTAX_MAX) {
1190 err = -EINVAL;
1191 goto out;
1192 }
1193 rt->u.dst.metrics[flavor-1] =
1194 *(u32 *)RTA_DATA(attr);
1195 }
1196 attr = RTA_NEXT(attr, attrlen);
1197 }
1198 }
1199
1200 if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
1201 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1202 if (!rt->u.dst.metrics[RTAX_MTU-1])
1203 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
1204 if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
1205 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
1206 rt->u.dst.dev = dev;
1207 rt->rt6i_idev = idev;
c71099ac 1208 rt->rt6i_table = table;
0d51aa80 1209 return ip6_ins_rt(rt, nlh, _rtattr, req);
1da177e4
LT		 1210
1211out:
1212 if (dev)
1213 dev_put(dev);
1214 if (idev)
1215 in6_dev_put(idev);
1216 if (rt)
1217 dst_free((struct dst_entry *) rt);
1218 return err;
1219}
1220
e0a1ad73
TG		 1221static int __ip6_del_rt(struct rt6_info *rt, struct nlmsghdr *nlh,
1222 void *_rtattr, struct netlink_skb_parms *req)
1da177e4
LT		 1223{
1224 int err;
c71099ac 1225 struct fib6_table *table;
1da177e4 1226
6c813a72
PM		 1227 if (rt == &ip6_null_entry)
1228 return -ENOENT;
1229
c71099ac
TG		 1230 table = rt->rt6i_table;
1231 write_lock_bh(&table->tb6_lock);
1da177e4 1232
0d51aa80 1233 err = fib6_del(rt, nlh, _rtattr, req);
1da177e4
LT		 1234 dst_release(&rt->u.dst);
1235
c71099ac 1236 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1237
1238 return err;
1239}
1240
e0a1ad73
TG		 1241int ip6_del_rt(struct rt6_info *rt)
1242{
1243 return __ip6_del_rt(rt, NULL, NULL, NULL);
1244}
1245
c71099ac
TG		 1246static int ip6_route_del(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh,
1247 void *_rtattr, struct netlink_skb_parms *req,
1248 u32 table_id)
1da177e4 1249{
c71099ac 1250 struct fib6_table *table;
1da177e4
LT		 1251 struct fib6_node *fn;
1252 struct rt6_info *rt;
1253 int err = -ESRCH;
1254
c71099ac
TG		 1255 table = fib6_get_table(table_id);
1256 if (table == NULL)
1257 return err;
1258
1259 read_lock_bh(&table->tb6_lock);
1da177e4 1260
c71099ac 1261 fn = fib6_locate(&table->tb6_root,
1da177e4
LT		 1262 &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len,
1263 &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len);
1264
1265 if (fn) {
1266 for (rt = fn->leaf; rt; rt = rt->u.next) {
1267 if (rtmsg->rtmsg_ifindex &&
1268 (rt->rt6i_dev == NULL ||
1269 rt->rt6i_dev->ifindex != rtmsg->rtmsg_ifindex))
1270 continue;
1271 if (rtmsg->rtmsg_flags&RTF_GATEWAY &&
1272 !ipv6_addr_equal(&rtmsg->rtmsg_gateway, &rt->rt6i_gateway))
1273 continue;
1274 if (rtmsg->rtmsg_metric &&
1275 rtmsg->rtmsg_metric != rt->rt6i_metric)
1276 continue;
1277 dst_hold(&rt->u.dst);
c71099ac 1278 read_unlock_bh(&table->tb6_lock);
1da177e4 1279
e0a1ad73 1280 return __ip6_del_rt(rt, nlh, _rtattr, req);
1da177e4
LT		 1281 }
1282 }
c71099ac 1283 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1284
1285 return err;
1286}
1287
1288/*
1289 * Handle redirects
1290 */
1291void rt6_redirect(struct in6_addr *dest, struct in6_addr *saddr,
1292 struct neighbour *neigh, u8 *lladdr, int on_link)
1293{
e843b9e1 1294 struct rt6_info *rt, *nrt = NULL;
e843b9e1 1295 struct fib6_node *fn;
c71099ac 1296 struct fib6_table *table;
8d71740c 1297 struct netevent_redirect netevent;
1da177e4 1298
c71099ac
TG		 1299 /* TODO: Very lazy, might need to check all tables */
1300 table = fib6_get_table(RT6_TABLE_MAIN);
1301 if (table == NULL)
1302 return;
1303
1da177e4 1304 /*
e843b9e1
YH		 1305 * Get the "current" route for this destination and
1306 * check if the redirect has come from approriate router.
1307 *
1308 * RFC 2461 specifies that redirects should only be
1309 * accepted if they come from the nexthop to the target.
1310 * Due to the way the routes are chosen, this notion
1311 * is a bit fuzzy and one might need to check all possible
1312 * routes.
1da177e4 1313 */
1da177e4 1314
c71099ac
TG		 1315 read_lock_bh(&table->tb6_lock);
1316 fn = fib6_lookup(&table->tb6_root, dest, NULL);
e843b9e1
YH		 1317restart:
1318 for (rt = fn->leaf; rt; rt = rt->u.next) {
1319 /*
1320 * Current route is on-link; redirect is always invalid.
1321 *
1322 * Seems, previous statement is not true. It could
1323 * be node, which looks for us as on-link (f.e. proxy ndisc)
1324 * But then router serving it might decide, that we should
1325 * know truth 8)8) --ANK (980726).
1326 */
1327 if (rt6_check_expired(rt))
1328 continue;
1329 if (!(rt->rt6i_flags & RTF_GATEWAY))
1330 continue;
1331 if (neigh->dev != rt->rt6i_dev)
1332 continue;
1333 if (!ipv6_addr_equal(saddr, &rt->rt6i_gateway))
1334 continue;
1335 break;
1336 }
1337 if (rt)
1338 dst_hold(&rt->u.dst);
c71099ac 1339 else if (rt6_need_strict(dest)) {
e843b9e1
YH		 1340 while ((fn = fn->parent) != NULL) {
1341 if (fn->fn_flags & RTN_ROOT)
1342 break;
1343 if (fn->fn_flags & RTN_RTINFO)
1344 goto restart;
1da177e4 1345 }
e843b9e1 1346 }
c71099ac 1347 read_unlock_bh(&table->tb6_lock);
e843b9e1
YH		 1348
1349 if (!rt) {
1da177e4
LT		 1350 if (net_ratelimit())
1351 printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
1352 "for redirect target\n");
e843b9e1 1353 return;
1da177e4
LT		 1354 }
1355
1da177e4
LT		 1356 /*
1357 * We have finally decided to accept it.
1358 */
1359
1360 neigh_update(neigh, lladdr, NUD_STALE,
1361 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1362 NEIGH_UPDATE_F_OVERRIDE|
1363 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1364 NEIGH_UPDATE_F_ISROUTER))
1365 );
1366
1367 /*
1368 * Redirect received -> path was valid.
1369 * Look, redirects are sent only in response to data packets,
1370 * so that this nexthop apparently is reachable. --ANK
1371 */
1372 dst_confirm(&rt->u.dst);
1373
1374 /* Duplicate redirect: silently ignore. */
1375 if (neigh == rt->u.dst.neighbour)
1376 goto out;
1377
1378 nrt = ip6_rt_copy(rt);
1379 if (nrt == NULL)
1380 goto out;
1381
1382 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1383 if (on_link)
1384 nrt->rt6i_flags &= ~RTF_GATEWAY;
1385
1386 ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
1387 nrt->rt6i_dst.plen = 128;
1388 nrt->u.dst.flags |= DST_HOST;
1389
1390 ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
1391 nrt->rt6i_nexthop = neigh_clone(neigh);
1392 /* Reset pmtu, it may be better */
1393 nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
1394 nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst));
1395
0d51aa80 1396 if (ip6_ins_rt(nrt, NULL, NULL, NULL))
1da177e4
LT		 1397 goto out;
1398
8d71740c
TT		 1399 netevent.old = &rt->u.dst;
1400 netevent.new = &nrt->u.dst;
1401 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1402
1da177e4 1403 if (rt->rt6i_flags&RTF_CACHE) {
e0a1ad73 1404 ip6_del_rt(rt);
1da177e4
LT		 1405 return;
1406 }
1407
1408out:
1409 dst_release(&rt->u.dst);
1410 return;
1411}
1412
1413/*
1414 * Handle ICMP "packet too big" messages
1415 * i.e. Path MTU discovery
1416 */
1417
1418void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
1419 struct net_device *dev, u32 pmtu)
1420{
1421 struct rt6_info *rt, *nrt;
1422 int allfrag = 0;
1423
1424 rt = rt6_lookup(daddr, saddr, dev->ifindex, 0);
1425 if (rt == NULL)
1426 return;
1427
1428 if (pmtu >= dst_mtu(&rt->u.dst))
1429 goto out;
1430
1431 if (pmtu < IPV6_MIN_MTU) {
1432 /*
1433 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
1434 * MTU (1280) and a fragment header should always be included
1435 * after a node receiving Too Big message reporting PMTU is
1436 * less than the IPv6 Minimum Link MTU.
1437 */
1438 pmtu = IPV6_MIN_MTU;
1439 allfrag = 1;
1440 }
1441
1442 /* New mtu received -> path was valid.
1443 They are sent only in response to data packets,
1444 so that this nexthop apparently is reachable. --ANK
1445 */
1446 dst_confirm(&rt->u.dst);
1447
1448 /* Host route. If it is static, it would be better
1449 not to override it, but add new one, so that
1450 when cache entry will expire old pmtu
1451 would return automatically.
1452 */
1453 if (rt->rt6i_flags & RTF_CACHE) {
1454 rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1455 if (allfrag)
1456 rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1457 dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires);
1458 rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
1459 goto out;
1460 }
1461
1462 /* Network route.
1463 Two cases are possible:
1464 1. It is connected route. Action: COW
1465 2. It is gatewayed route or NONEXTHOP route. Action: clone it.
1466 */
d5315b50 1467 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
a1e78363 1468 nrt = rt6_alloc_cow(rt, daddr, saddr);
d5315b50
YH		 1469 else
1470 nrt = rt6_alloc_clone(rt, daddr);
a1e78363 1471
d5315b50 1472 if (nrt) {
a1e78363
YH		 1473 nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1474 if (allfrag)
1475 nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1476
1477 /* According to RFC 1981, detecting PMTU increase shouldn't be
1478 * happened within 5 mins, the recommended timer is 10 mins.
1479 * Here this route expiration time is set to ip6_rt_mtu_expires
1480 * which is 10 mins. After 10 mins the decreased pmtu is expired
1481 * and detecting PMTU increase will be automatically happened.
1482 */
1483 dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
1484 nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
1485
1486 ip6_ins_rt(nrt, NULL, NULL, NULL);
1da177e4 1487 }
1da177e4
LT		 1488out:
1489 dst_release(&rt->u.dst);
1490}
1491
1492/*
1493 * Misc support functions
1494 */
1495
1496static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
1497{
1498 struct rt6_info *rt = ip6_dst_alloc();
1499
1500 if (rt) {
1501 rt->u.dst.input = ort->u.dst.input;
1502 rt->u.dst.output = ort->u.dst.output;
1503
1504 memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
1505 rt->u.dst.dev = ort->u.dst.dev;
1506 if (rt->u.dst.dev)
1507 dev_hold(rt->u.dst.dev);
1508 rt->rt6i_idev = ort->rt6i_idev;
1509 if (rt->rt6i_idev)
1510 in6_dev_hold(rt->rt6i_idev);
1511 rt->u.dst.lastuse = jiffies;
1512 rt->rt6i_expires = 0;
1513
1514 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
1515 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
1516 rt->rt6i_metric = 0;
1517
1518 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1519#ifdef CONFIG_IPV6_SUBTREES
1520 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1521#endif
c71099ac 1522 rt->rt6i_table = ort->rt6i_table;
1da177e4
LT		 1523 }
1524 return rt;
1525}
1526
70ceb4f5
YH		 1527#ifdef CONFIG_IPV6_ROUTE_INFO
1528static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
1529 struct in6_addr *gwaddr, int ifindex)
1530{
1531 struct fib6_node *fn;
1532 struct rt6_info *rt = NULL;
c71099ac
TG		 1533 struct fib6_table *table;
1534
1535 table = fib6_get_table(RT6_TABLE_INFO);
1536 if (table == NULL)
1537 return NULL;
70ceb4f5 1538
c71099ac
TG		 1539 write_lock_bh(&table->tb6_lock);
1540 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
70ceb4f5
YH		 1541 if (!fn)
1542 goto out;
1543
1544 for (rt = fn->leaf; rt; rt = rt->u.next) {
1545 if (rt->rt6i_dev->ifindex != ifindex)
1546 continue;
1547 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1548 continue;
1549 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1550 continue;
1551 dst_hold(&rt->u.dst);
1552 break;
1553 }
1554out:
c71099ac 1555 write_unlock_bh(&table->tb6_lock);
70ceb4f5
YH		 1556 return rt;
1557}
1558
1559static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
1560 struct in6_addr *gwaddr, int ifindex,
1561 unsigned pref)
1562{
1563 struct in6_rtmsg rtmsg;
1564
1565 memset(&rtmsg, 0, sizeof(rtmsg));
1566 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1567 ipv6_addr_copy(&rtmsg.rtmsg_dst, prefix);
1568 rtmsg.rtmsg_dst_len = prefixlen;
1569 ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr);
1570 rtmsg.rtmsg_metric = 1024;
1571 rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | RTF_UP | RTF_PREF(pref);
e317da96
YH		 1572 /* We should treat it as a default route if prefix length is 0. */
1573 if (!prefixlen)
1574 rtmsg.rtmsg_flags |= RTF_DEFAULT;
70ceb4f5
YH		 1575 rtmsg.rtmsg_ifindex = ifindex;
1576
c71099ac 1577 ip6_route_add(&rtmsg, NULL, NULL, NULL, RT6_TABLE_INFO);
70ceb4f5
YH		 1578
1579 return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex);
1580}
1581#endif
1582
1da177e4
LT		 1583struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
1584{
1585 struct rt6_info *rt;
c71099ac 1586 struct fib6_table *table;
1da177e4 1587
c71099ac
TG		 1588 table = fib6_get_table(RT6_TABLE_DFLT);
1589 if (table == NULL)
1590 return NULL;
1da177e4 1591
c71099ac
TG		 1592 write_lock_bh(&table->tb6_lock);
1593 for (rt = table->tb6_root.leaf; rt; rt=rt->u.next) {
1da177e4 1594 if (dev == rt->rt6i_dev &&
045927ff 1595 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1da177e4
LT		 1596 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1597 break;
1598 }
1599 if (rt)
1600 dst_hold(&rt->u.dst);
c71099ac 1601 write_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1602 return rt;
1603}
1604
1605struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
ebacaaa0
YH		 1606 struct net_device *dev,
1607 unsigned int pref)
1da177e4
LT		 1608{
1609 struct in6_rtmsg rtmsg;
1610
1611 memset(&rtmsg, 0, sizeof(struct in6_rtmsg));
1612 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1613 ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr);
1614 rtmsg.rtmsg_metric = 1024;
ebacaaa0
YH		 1615 rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | RTF_UP | RTF_EXPIRES |
1616 RTF_PREF(pref);
1da177e4
LT		 1617
1618 rtmsg.rtmsg_ifindex = dev->ifindex;
1619
c71099ac 1620 ip6_route_add(&rtmsg, NULL, NULL, NULL, RT6_TABLE_DFLT);
1da177e4
LT		 1621 return rt6_get_dflt_router(gwaddr, dev);
1622}
1623
1624void rt6_purge_dflt_routers(void)
1625{
1626 struct rt6_info *rt;
c71099ac
TG		 1627 struct fib6_table *table;
1628
1629 /* NOTE: Keep consistent with rt6_get_dflt_router */
1630 table = fib6_get_table(RT6_TABLE_DFLT);
1631 if (table == NULL)
1632 return;
1da177e4
LT		 1633
1634restart:
c71099ac
TG		 1635 read_lock_bh(&table->tb6_lock);
1636 for (rt = table->tb6_root.leaf; rt; rt = rt->u.next) {
1da177e4
LT		 1637 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
1638 dst_hold(&rt->u.dst);
c71099ac 1639 read_unlock_bh(&table->tb6_lock);
e0a1ad73 1640 ip6_del_rt(rt);
1da177e4
LT		 1641 goto restart;
1642 }
1643 }
c71099ac 1644 read_unlock_bh(&table->tb6_lock);
1da177e4
LT		 1645}
1646
1647int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
1648{
1649 struct in6_rtmsg rtmsg;
1650 int err;
1651
1652 switch(cmd) {
1653 case SIOCADDRT: /* Add a route */
1654 case SIOCDELRT: /* Delete a route */
1655 if (!capable(CAP_NET_ADMIN))
1656 return -EPERM;
1657 err = copy_from_user(&rtmsg, arg,
1658 sizeof(struct in6_rtmsg));
1659 if (err)
1660 return -EFAULT;
1661
1662 rtnl_lock();
1663 switch (cmd) {
1664 case SIOCADDRT:
c71099ac
TG		 1665 err = ip6_route_add(&rtmsg, NULL, NULL, NULL,
1666 RT6_TABLE_MAIN);
1da177e4
LT		 1667 break;
1668 case SIOCDELRT:
c71099ac
TG		 1669 err = ip6_route_del(&rtmsg, NULL, NULL, NULL,
1670 RT6_TABLE_MAIN);
1da177e4
LT		 1671 break;
1672 default:
1673 err = -EINVAL;
1674 }
1675 rtnl_unlock();
1676
1677 return err;
1678 };
1679
1680 return -EINVAL;
1681}
1682
1683/*
1684 * Drop the packet on the floor
1685 */
1686
20380731 1687static int ip6_pkt_discard(struct sk_buff *skb)
1da177e4 1688{
76d0cc1b
LL		 1689 int type = ipv6_addr_type(&skb->nh.ipv6h->daddr);
1690 if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED)
1691 IP6_INC_STATS(IPSTATS_MIB_INADDRERRORS);
1692
1da177e4
LT		 1693 IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
1694 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev);
1695 kfree_skb(skb);
1696 return 0;
1697}
1698
20380731 1699static int ip6_pkt_discard_out(struct sk_buff *skb)
1da177e4
LT		 1700{
1701 skb->dev = skb->dst->dev;
1702 return ip6_pkt_discard(skb);
1703}
1704
1705/*
1706 * Allocate a dst for local (unicast / anycast) address.
1707 */
1708
1709struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
1710 const struct in6_addr *addr,
1711 int anycast)
1712{
1713 struct rt6_info *rt = ip6_dst_alloc();
1714
1715 if (rt == NULL)
1716 return ERR_PTR(-ENOMEM);
1717
1718 dev_hold(&loopback_dev);
1719 in6_dev_hold(idev);
1720
1721 rt->u.dst.flags = DST_HOST;
1722 rt->u.dst.input = ip6_input;
1723 rt->u.dst.output = ip6_output;
1724 rt->rt6i_dev = &loopback_dev;
1725 rt->rt6i_idev = idev;
1726 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
1727 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
1728 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1729 rt->u.dst.obsolete = -1;
1730
1731 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 1732 if (anycast)
1733 rt->rt6i_flags |= RTF_ANYCAST;
1734 else
1da177e4
LT		 1735 rt->rt6i_flags |= RTF_LOCAL;
1736 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
1737 if (rt->rt6i_nexthop == NULL) {
1738 dst_free((struct dst_entry *) rt);
1739 return ERR_PTR(-ENOMEM);
1740 }
1741
1742 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
1743 rt->rt6i_dst.plen = 128;
c71099ac 1744 rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL);
1da177e4
LT		 1745
1746 atomic_set(&rt->u.dst.__refcnt, 1);
1747
1748 return rt;
1749}
1750
1751static int fib6_ifdown(struct rt6_info *rt, void *arg)
1752{
1753 if (((void*)rt->rt6i_dev == arg || arg == NULL) &&
1754 rt != &ip6_null_entry) {
1755 RT6_TRACE("deleted by ifdown %p\n", rt);
1756 return -1;
1757 }
1758 return 0;
1759}
1760
1761void rt6_ifdown(struct net_device *dev)
1762{
c71099ac 1763 fib6_clean_all(fib6_ifdown, 0, dev);
1da177e4
LT		 1764}
1765
1766struct rt6_mtu_change_arg
1767{
1768 struct net_device *dev;
1769 unsigned mtu;
1770};
1771
1772static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
1773{
1774 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
1775 struct inet6_dev *idev;
1776
1777 /* In IPv6 pmtu discovery is not optional,
1778 so that RTAX_MTU lock cannot disable it.
1779 We still use this lock to block changes
1780 caused by addrconf/ndisc.
1781 */
1782
1783 idev = __in6_dev_get(arg->dev);
1784 if (idev == NULL)
1785 return 0;
1786
1787 /* For administrative MTU increase, there is no way to discover
1788 IPv6 PMTU increase, so PMTU increase should be updated here.
1789 Since RFC 1981 doesn't include administrative MTU increase
1790 update PMTU increase is a MUST. (i.e. jumbo frame)
1791 */
1792 /*
1793 If new MTU is less than route PMTU, this new MTU will be the
1794 lowest MTU in the path, update the route PMTU to reflect PMTU
1795 decreases; if new MTU is greater than route PMTU, and the
1796 old MTU is the lowest MTU in the path, update the route PMTU
1797 to reflect the increase. In this case if the other nodes' MTU
1798 also have the lowest MTU, TOO BIG MESSAGE will be lead to
1799 PMTU discouvery.
1800 */
1801 if (rt->rt6i_dev == arg->dev &&
1802 !dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
1803 (dst_mtu(&rt->u.dst) > arg->mtu ||
1804 (dst_mtu(&rt->u.dst) < arg->mtu &&
1805 dst_mtu(&rt->u.dst) == idev->cnf.mtu6)))
1806 rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
1807 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
1808 return 0;
1809}
1810
1811void rt6_mtu_change(struct net_device *dev, unsigned mtu)
1812{
c71099ac
TG		 1813 struct rt6_mtu_change_arg arg = {
1814 .dev = dev,
1815 .mtu = mtu,
1816 };
1da177e4 1817
c71099ac 1818 fib6_clean_all(rt6_mtu_change_route, 0, &arg);
1da177e4
LT		 1819}
1820
1821static int inet6_rtm_to_rtmsg(struct rtmsg *r, struct rtattr **rta,
1822 struct in6_rtmsg *rtmsg)
1823{
1824 memset(rtmsg, 0, sizeof(*rtmsg));
1825
1826 rtmsg->rtmsg_dst_len = r->rtm_dst_len;
1827 rtmsg->rtmsg_src_len = r->rtm_src_len;
1828 rtmsg->rtmsg_flags = RTF_UP;
1829 if (r->rtm_type == RTN_UNREACHABLE)
1830 rtmsg->rtmsg_flags |= RTF_REJECT;
1831
1832 if (rta[RTA_GATEWAY-1]) {
1833 if (rta[RTA_GATEWAY-1]->rta_len != RTA_LENGTH(16))
1834 return -EINVAL;
1835 memcpy(&rtmsg->rtmsg_gateway, RTA_DATA(rta[RTA_GATEWAY-1]), 16);
1836 rtmsg->rtmsg_flags |= RTF_GATEWAY;
1837 }
1838 if (rta[RTA_DST-1]) {
1839 if (RTA_PAYLOAD(rta[RTA_DST-1]) < ((r->rtm_dst_len+7)>>3))
1840 return -EINVAL;
1841 memcpy(&rtmsg->rtmsg_dst, RTA_DATA(rta[RTA_DST-1]), ((r->rtm_dst_len+7)>>3));
1842 }
1843 if (rta[RTA_SRC-1]) {
1844 if (RTA_PAYLOAD(rta[RTA_SRC-1]) < ((r->rtm_src_len+7)>>3))
1845 return -EINVAL;
1846 memcpy(&rtmsg->rtmsg_src, RTA_DATA(rta[RTA_SRC-1]), ((r->rtm_src_len+7)>>3));
1847 }
1848 if (rta[RTA_OIF-1]) {
1849 if (rta[RTA_OIF-1]->rta_len != RTA_LENGTH(sizeof(int)))
1850 return -EINVAL;
1851 memcpy(&rtmsg->rtmsg_ifindex, RTA_DATA(rta[RTA_OIF-1]), sizeof(int));
1852 }
1853 if (rta[RTA_PRIORITY-1]) {
1854 if (rta[RTA_PRIORITY-1]->rta_len != RTA_LENGTH(4))
1855 return -EINVAL;
1856 memcpy(&rtmsg->rtmsg_metric, RTA_DATA(rta[RTA_PRIORITY-1]), 4);
1857 }
1858 return 0;
1859}
1860
1861int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1862{
1863 struct rtmsg *r = NLMSG_DATA(nlh);
1864 struct in6_rtmsg rtmsg;
1865
1866 if (inet6_rtm_to_rtmsg(r, arg, &rtmsg))
1867 return -EINVAL;
9e762a4a
PM		 1868 return ip6_route_del(&rtmsg, nlh, arg, &NETLINK_CB(skb),
1869 rtm_get_table(arg, r->rtm_table));
1da177e4
LT		 1870}
1871
1872int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1873{
1874 struct rtmsg *r = NLMSG_DATA(nlh);
1875 struct in6_rtmsg rtmsg;
1876
1877 if (inet6_rtm_to_rtmsg(r, arg, &rtmsg))
1878 return -EINVAL;
9e762a4a
PM		 1879 return ip6_route_add(&rtmsg, nlh, arg, &NETLINK_CB(skb),
1880 rtm_get_table(arg, r->rtm_table));
1da177e4
LT		 1881}
1882
1da177e4 1883static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
0d51aa80
JHS		 1884 struct in6_addr *dst, struct in6_addr *src,
1885 int iif, int type, u32 pid, u32 seq,
1886 int prefix, unsigned int flags)
1da177e4
LT		 1887{
1888 struct rtmsg *rtm;
1889 struct nlmsghdr *nlh;
1890 unsigned char *b = skb->tail;
1891 struct rta_cacheinfo ci;
9e762a4a 1892 u32 table;
1da177e4
LT		 1893
1894 if (prefix) { /* user wants prefix routes only */
1895 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
1896 /* success since this is not a prefix route */
1897 return 1;
1898 }
1899 }
1900
b6544c0b 1901 nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*rtm), flags);
1da177e4
LT		 1902 rtm = NLMSG_DATA(nlh);
1903 rtm->rtm_family = AF_INET6;
1904 rtm->rtm_dst_len = rt->rt6i_dst.plen;
1905 rtm->rtm_src_len = rt->rt6i_src.plen;
1906 rtm->rtm_tos = 0;
c71099ac 1907 if (rt->rt6i_table)
9e762a4a 1908 table = rt->rt6i_table->tb6_id;
c71099ac 1909 else
9e762a4a
PM		 1910 table = RT6_TABLE_UNSPEC;
1911 rtm->rtm_table = table;
1912 RTA_PUT_U32(skb, RTA_TABLE, table);
1da177e4
LT		 1913 if (rt->rt6i_flags&RTF_REJECT)
1914 rtm->rtm_type = RTN_UNREACHABLE;
1915 else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
1916 rtm->rtm_type = RTN_LOCAL;
1917 else
1918 rtm->rtm_type = RTN_UNICAST;
1919 rtm->rtm_flags = 0;
1920 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
1921 rtm->rtm_protocol = rt->rt6i_protocol;
1922 if (rt->rt6i_flags&RTF_DYNAMIC)
1923 rtm->rtm_protocol = RTPROT_REDIRECT;
1924 else if (rt->rt6i_flags & RTF_ADDRCONF)
1925 rtm->rtm_protocol = RTPROT_KERNEL;
1926 else if (rt->rt6i_flags&RTF_DEFAULT)
1927 rtm->rtm_protocol = RTPROT_RA;
1928
1929 if (rt->rt6i_flags&RTF_CACHE)
1930 rtm->rtm_flags |= RTM_F_CLONED;
1931
1932 if (dst) {
1933 RTA_PUT(skb, RTA_DST, 16, dst);
1934 rtm->rtm_dst_len = 128;
1935 } else if (rtm->rtm_dst_len)
1936 RTA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
1937#ifdef CONFIG_IPV6_SUBTREES
1938 if (src) {
1939 RTA_PUT(skb, RTA_SRC, 16, src);
1940 rtm->rtm_src_len = 128;
1941 } else if (rtm->rtm_src_len)
1942 RTA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
1943#endif
1944 if (iif)
1945 RTA_PUT(skb, RTA_IIF, 4, &iif);
1946 else if (dst) {
1947 struct in6_addr saddr_buf;
1948 if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
1949 RTA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
1950 }
1951 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
1952 goto rtattr_failure;
1953 if (rt->u.dst.neighbour)
1954 RTA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);
1955 if (rt->u.dst.dev)
1956 RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->rt6i_dev->ifindex);
1957 RTA_PUT(skb, RTA_PRIORITY, 4, &rt->rt6i_metric);
1958 ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse);
1959 if (rt->rt6i_expires)
1960 ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies);
1961 else
1962 ci.rta_expires = 0;
1963 ci.rta_used = rt->u.dst.__use;
1964 ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt);
1965 ci.rta_error = rt->u.dst.error;
1966 ci.rta_id = 0;
1967 ci.rta_ts = 0;
1968 ci.rta_tsage = 0;
1969 RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci);
1970 nlh->nlmsg_len = skb->tail - b;
1971 return skb->len;
1972
1973nlmsg_failure:
1974rtattr_failure:
1975 skb_trim(skb, b - skb->data);
1976 return -1;
1977}
1978
1b43af54 1979int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1da177e4
LT		 1980{
1981 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
1982 int prefix;
1983
1984 if (arg->cb->nlh->nlmsg_len >= NLMSG_LENGTH(sizeof(struct rtmsg))) {
1985 struct rtmsg *rtm = NLMSG_DATA(arg->cb->nlh);
1986 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
1987 } else
1988 prefix = 0;
1989
1990 return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
1991 NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
0d51aa80 1992 prefix, NLM_F_MULTI);
1da177e4
LT		 1993}
1994
1da177e4
LT		 1995int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
1996{
1997 struct rtattr **rta = arg;
1998 int iif = 0;
1999 int err = -ENOBUFS;
2000 struct sk_buff *skb;
2001 struct flowi fl;
2002 struct rt6_info *rt;
2003
2004 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2005 if (skb == NULL)
2006 goto out;
2007
2008 /* Reserve room for dummy headers, this skb can pass
2009 through good chunk of routing engine.
2010 */
2011 skb->mac.raw = skb->data;
2012 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2013
2014 memset(&fl, 0, sizeof(fl));
2015 if (rta[RTA_SRC-1])
2016 ipv6_addr_copy(&fl.fl6_src,
2017 (struct in6_addr*)RTA_DATA(rta[RTA_SRC-1]));
2018 if (rta[RTA_DST-1])
2019 ipv6_addr_copy(&fl.fl6_dst,
2020 (struct in6_addr*)RTA_DATA(rta[RTA_DST-1]));
2021
2022 if (rta[RTA_IIF-1])
2023 memcpy(&iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
2024
2025 if (iif) {
2026 struct net_device *dev;
2027 dev = __dev_get_by_index(iif);
2028 if (!dev) {
2029 err = -ENODEV;
2030 goto out_free;
2031 }
2032 }
2033
2034 fl.oif = 0;
2035 if (rta[RTA_OIF-1])
2036 memcpy(&fl.oif, RTA_DATA(rta[RTA_OIF-1]), sizeof(int));
2037
2038 rt = (struct rt6_info*)ip6_route_output(NULL, &fl);
2039
2040 skb->dst = &rt->u.dst;
2041
2042 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
2043 err = rt6_fill_node(skb, rt,
2044 &fl.fl6_dst, &fl.fl6_src,
2045 iif,
2046 RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
0d51aa80 2047 nlh->nlmsg_seq, 0, 0);
1da177e4
LT		 2048 if (err < 0) {
2049 err = -EMSGSIZE;
2050 goto out_free;
2051 }
2052
2942e900 2053 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
1da177e4
LT		 2054out:
2055 return err;
2056out_free:
2057 kfree_skb(skb);
2058 goto out;
2059}
2060
0d51aa80
JHS		 2061void inet6_rt_notify(int event, struct rt6_info *rt, struct nlmsghdr *nlh,
2062 struct netlink_skb_parms *req)
1da177e4
LT		 2063{
2064 struct sk_buff *skb;
21713ebc
TG		 2065 u32 pid = req ? req->pid : 0;
2066 u32 seq = nlh ? nlh->nlmsg_seq : 0;
2067 int payload = sizeof(struct rtmsg) + 256;
2068 int err = -ENOBUFS;
2069
2070 skb = nlmsg_new(nlmsg_total_size(payload), gfp_any());
2071 if (skb == NULL)
2072 goto errout;
2073
2074 err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0);
2075 if (err < 0) {
1da177e4 2076 kfree_skb(skb);
21713ebc 2077 goto errout;
1da177e4 2078 }
21713ebc
TG		 2079
2080 err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any());
2081errout:
2082 if (err < 0)
2083 rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err);
1da177e4
LT		 2084}
2085
2086/*
2087 * /proc
2088 */
2089
2090#ifdef CONFIG_PROC_FS
2091
2092#define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1)
2093
2094struct rt6_proc_arg
2095{
2096 char *buffer;
2097 int offset;
2098 int length;
2099 int skip;
2100 int len;
2101};
2102
2103static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2104{
2105 struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg;
2106 int i;
2107
2108 if (arg->skip < arg->offset / RT6_INFO_LEN) {
2109 arg->skip++;
2110 return 0;
2111 }
2112
2113 if (arg->len >= arg->length)
2114 return 0;
2115
2116 for (i=0; i<16; i++) {
2117 sprintf(arg->buffer + arg->len, "%02x",
2118 rt->rt6i_dst.addr.s6_addr[i]);
2119 arg->len += 2;
2120 }
2121 arg->len += sprintf(arg->buffer + arg->len, " %02x ",
2122 rt->rt6i_dst.plen);
2123
2124#ifdef CONFIG_IPV6_SUBTREES
2125 for (i=0; i<16; i++) {
2126 sprintf(arg->buffer + arg->len, "%02x",
2127 rt->rt6i_src.addr.s6_addr[i]);
2128 arg->len += 2;
2129 }
2130 arg->len += sprintf(arg->buffer + arg->len, " %02x ",
2131 rt->rt6i_src.plen);
2132#else
2133 sprintf(arg->buffer + arg->len,
2134 "00000000000000000000000000000000 00 ");
2135 arg->len += 36;
2136#endif
2137
2138 if (rt->rt6i_nexthop) {
2139 for (i=0; i<16; i++) {
2140 sprintf(arg->buffer + arg->len, "%02x",
2141 rt->rt6i_nexthop->primary_key[i]);
2142 arg->len += 2;
2143 }
2144 } else {
2145 sprintf(arg->buffer + arg->len,
2146 "00000000000000000000000000000000");
2147 arg->len += 32;
2148 }
2149 arg->len += sprintf(arg->buffer + arg->len,
2150 " %08x %08x %08x %08x %8s\n",
2151 rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
2152 rt->u.dst.__use, rt->rt6i_flags,
2153 rt->rt6i_dev ? rt->rt6i_dev->name : "");
2154 return 0;
2155}
2156
2157static int rt6_proc_info(char *buffer, char **start, off_t offset, int length)
2158{
c71099ac
TG		 2159 struct rt6_proc_arg arg = {
2160 .buffer = buffer,
2161 .offset = offset,
2162 .length = length,
2163 };
1da177e4 2164
c71099ac 2165 fib6_clean_all(rt6_info_route, 0, &arg);
1da177e4
LT		 2166
2167 *start = buffer;
2168 if (offset)
2169 *start += offset % RT6_INFO_LEN;
2170
2171 arg.len -= offset % RT6_INFO_LEN;
2172
2173 if (arg.len > length)
2174 arg.len = length;
2175 if (arg.len < 0)
2176 arg.len = 0;
2177
2178 return arg.len;
2179}
2180
1da177e4
LT		 2181static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2182{
2183 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2184 rt6_stats.fib_nodes, rt6_stats.fib_route_nodes,
2185 rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries,
2186 rt6_stats.fib_rt_cache,
2187 atomic_read(&ip6_dst_ops.entries),
2188 rt6_stats.fib_discarded_routes);
2189
2190 return 0;
2191}
2192
2193static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2194{
2195 return single_open(file, rt6_stats_seq_show, NULL);
2196}
2197
2198static struct file_operations rt6_stats_seq_fops = {
2199 .owner = THIS_MODULE,
2200 .open = rt6_stats_seq_open,
2201 .read = seq_read,
2202 .llseek = seq_lseek,
2203 .release = single_release,
2204};
2205#endif /* CONFIG_PROC_FS */
2206
2207#ifdef CONFIG_SYSCTL
2208
2209static int flush_delay;
2210
2211static
2212int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
2213 void __user *buffer, size_t *lenp, loff_t *ppos)
2214{
2215 if (write) {
2216 proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
2217 fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay);
2218 return 0;
2219 } else
2220 return -EINVAL;
2221}
2222
2223ctl_table ipv6_route_table[] = {
2224 {
2225 .ctl_name = NET_IPV6_ROUTE_FLUSH,
2226 .procname = "flush",
2227 .data = &flush_delay,
2228 .maxlen = sizeof(int),
89c8b3a1 2229 .mode = 0200,
1da177e4
LT		 2230 .proc_handler = &ipv6_sysctl_rtcache_flush
2231 },
2232 {
2233 .ctl_name = NET_IPV6_ROUTE_GC_THRESH,
2234 .procname = "gc_thresh",
2235 .data = &ip6_dst_ops.gc_thresh,
2236 .maxlen = sizeof(int),
2237 .mode = 0644,
2238 .proc_handler = &proc_dointvec,
2239 },
2240 {
2241 .ctl_name = NET_IPV6_ROUTE_MAX_SIZE,
2242 .procname = "max_size",
2243 .data = &ip6_rt_max_size,
2244 .maxlen = sizeof(int),
2245 .mode = 0644,
2246 .proc_handler = &proc_dointvec,
2247 },
2248 {
2249 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL,
2250 .procname = "gc_min_interval",
2251 .data = &ip6_rt_gc_min_interval,
2252 .maxlen = sizeof(int),
2253 .mode = 0644,
2254 .proc_handler = &proc_dointvec_jiffies,
2255 .strategy = &sysctl_jiffies,
2256 },
2257 {
2258 .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT,
2259 .procname = "gc_timeout",
2260 .data = &ip6_rt_gc_timeout,
2261 .maxlen = sizeof(int),
2262 .mode = 0644,
2263 .proc_handler = &proc_dointvec_jiffies,
2264 .strategy = &sysctl_jiffies,
2265 },
2266 {
2267 .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL,
2268 .procname = "gc_interval",
2269 .data = &ip6_rt_gc_interval,
2270 .maxlen = sizeof(int),
2271 .mode = 0644,
2272 .proc_handler = &proc_dointvec_jiffies,
2273 .strategy = &sysctl_jiffies,
2274 },
2275 {
2276 .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY,
2277 .procname = "gc_elasticity",
2278 .data = &ip6_rt_gc_elasticity,
2279 .maxlen = sizeof(int),
2280 .mode = 0644,
2281 .proc_handler = &proc_dointvec_jiffies,
2282 .strategy = &sysctl_jiffies,
2283 },
2284 {
2285 .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES,
2286 .procname = "mtu_expires",
2287 .data = &ip6_rt_mtu_expires,
2288 .maxlen = sizeof(int),
2289 .mode = 0644,
2290 .proc_handler = &proc_dointvec_jiffies,
2291 .strategy = &sysctl_jiffies,
2292 },
2293 {
2294 .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS,
2295 .procname = "min_adv_mss",
2296 .data = &ip6_rt_min_advmss,
2297 .maxlen = sizeof(int),
2298 .mode = 0644,
2299 .proc_handler = &proc_dointvec_jiffies,
2300 .strategy = &sysctl_jiffies,
2301 },
2302 {
2303 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
2304 .procname = "gc_min_interval_ms",
2305 .data = &ip6_rt_gc_min_interval,
2306 .maxlen = sizeof(int),
2307 .mode = 0644,
2308 .proc_handler = &proc_dointvec_ms_jiffies,
2309 .strategy = &sysctl_ms_jiffies,
2310 },
2311 { .ctl_name = 0 }
2312};
2313
2314#endif
2315
2316void __init ip6_route_init(void)
2317{
2318 struct proc_dir_entry *p;
2319
2320 ip6_dst_ops.kmem_cachep = kmem_cache_create("ip6_dst_cache",
2321 sizeof(struct rt6_info),
2322 0, SLAB_HWCACHE_ALIGN,
2323 NULL, NULL);
2324 if (!ip6_dst_ops.kmem_cachep)
2325 panic("cannot create ip6_dst_cache");
2326
2327 fib6_init();
2328#ifdef CONFIG_PROC_FS
2329 p = proc_net_create("ipv6_route", 0, rt6_proc_info);
2330 if (p)
2331 p->owner = THIS_MODULE;
2332
2333 proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
2334#endif
2335#ifdef CONFIG_XFRM
2336 xfrm6_init();
2337#endif
101367c2
TG		 2338#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2339 fib6_rules_init();
2340#endif
1da177e4
LT		 2341}
2342
2343void ip6_route_cleanup(void)
2344{
101367c2
TG		 2345#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2346 fib6_rules_cleanup();
2347#endif
1da177e4
LT		 2348#ifdef CONFIG_PROC_FS
2349 proc_net_remove("ipv6_route");
2350 proc_net_remove("rt6_stats");
2351#endif
2352#ifdef CONFIG_XFRM
2353 xfrm6_fini();
2354#endif
2355 rt6_ifdown(NULL);
2356 fib6_gc_cleanup();
2357 kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
2358}
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