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[IPV6]: ROUTE: Add rt6_alloc_clone() for cloning route allocation.
[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/config.h>
29#include <linux/errno.h>
30#include <linux/types.h>
31#include <linux/times.h>
32#include <linux/socket.h>
33#include <linux/sockios.h>
34#include <linux/net.h>
35#include <linux/route.h>
36#include <linux/netdevice.h>
37#include <linux/in6.h>
38#include <linux/init.h>
39#include <linux/netlink.h>
40#include <linux/if_arp.h>
41
42#ifdef CONFIG_PROC_FS
43#include <linux/proc_fs.h>
44#include <linux/seq_file.h>
45#endif
46
47#include <net/snmp.h>
48#include <net/ipv6.h>
49#include <net/ip6_fib.h>
50#include <net/ip6_route.h>
51#include <net/ndisc.h>
52#include <net/addrconf.h>
53#include <net/tcp.h>
54#include <linux/rtnetlink.h>
55#include <net/dst.h>
56#include <net/xfrm.h>
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
75
76static int ip6_rt_max_size = 4096;
77static int ip6_rt_gc_min_interval = HZ / 2;
78static int ip6_rt_gc_timeout = 60*HZ;
79int ip6_rt_gc_interval = 30*HZ;
80static int ip6_rt_gc_elasticity = 9;
81static int ip6_rt_mtu_expires = 10*60*HZ;
82static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
83
84static struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
85static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
86static struct dst_entry *ip6_negative_advice(struct dst_entry *);
87static void ip6_dst_destroy(struct dst_entry *);
88static void ip6_dst_ifdown(struct dst_entry *,
89 struct net_device *dev, int how);
90static int ip6_dst_gc(void);
91
92static int ip6_pkt_discard(struct sk_buff *skb);
93static int ip6_pkt_discard_out(struct sk_buff *skb);
94static void ip6_link_failure(struct sk_buff *skb);
95static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
96
97static struct dst_ops ip6_dst_ops = {
98 .family = AF_INET6,
99 .protocol = __constant_htons(ETH_P_IPV6),
100 .gc = ip6_dst_gc,
101 .gc_thresh = 1024,
102 .check = ip6_dst_check,
103 .destroy = ip6_dst_destroy,
104 .ifdown = ip6_dst_ifdown,
105 .negative_advice = ip6_negative_advice,
106 .link_failure = ip6_link_failure,
107 .update_pmtu = ip6_rt_update_pmtu,
108 .entry_size = sizeof(struct rt6_info),
109};
110
111struct rt6_info ip6_null_entry = {
112 .u = {
113 .dst = {
114 .__refcnt = ATOMIC_INIT(1),
115 .__use = 1,
116 .dev = &loopback_dev,
117 .obsolete = -1,
118 .error = -ENETUNREACH,
119 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
120 .input = ip6_pkt_discard,
121 .output = ip6_pkt_discard_out,
122 .ops = &ip6_dst_ops,
123 .path = (struct dst_entry*)&ip6_null_entry,
124 }
125 },
126 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
127 .rt6i_metric = ~(u32) 0,
128 .rt6i_ref = ATOMIC_INIT(1),
129};
130
131struct fib6_node ip6_routing_table = {
132 .leaf = &ip6_null_entry,
133 .fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO,
134};
135
136/* Protects all the ip6 fib */
137
138DEFINE_RWLOCK(rt6_lock);
139
140
141/* allocate dst with ip6_dst_ops */
142static __inline__ struct rt6_info *ip6_dst_alloc(void)
143{
144 return (struct rt6_info *)dst_alloc(&ip6_dst_ops);
145}
146
147static void ip6_dst_destroy(struct dst_entry *dst)
148{
149 struct rt6_info *rt = (struct rt6_info *)dst;
150 struct inet6_dev *idev = rt->rt6i_idev;
151
152 if (idev != NULL) {
153 rt->rt6i_idev = NULL;
154 in6_dev_put(idev);
155 }
156}
157
158static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
159 int how)
160{
161 struct rt6_info *rt = (struct rt6_info *)dst;
162 struct inet6_dev *idev = rt->rt6i_idev;
163
164 if (dev != &loopback_dev && idev != NULL && idev->dev == dev) {
165 struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
166 if (loopback_idev != NULL) {
167 rt->rt6i_idev = loopback_idev;
168 in6_dev_put(idev);
169 }
170 }
171}
172
173static __inline__ int rt6_check_expired(const struct rt6_info *rt)
174{
175 return (rt->rt6i_flags & RTF_EXPIRES &&
176 time_after(jiffies, rt->rt6i_expires));
177}
178
179/*
180 * Route lookup. Any rt6_lock is implied.
181 */
182
183static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt,
184 int oif,
185 int strict)
186{
187 struct rt6_info *local = NULL;
188 struct rt6_info *sprt;
189
190 if (oif) {
191 for (sprt = rt; sprt; sprt = sprt->u.next) {
192 struct net_device *dev = sprt->rt6i_dev;
193 if (dev->ifindex == oif)
194 return sprt;
195 if (dev->flags & IFF_LOOPBACK) {
196 if (sprt->rt6i_idev == NULL ||
197 sprt->rt6i_idev->dev->ifindex != oif) {
198 if (strict && oif)
199 continue;
200 if (local && (!oif ||
201 local->rt6i_idev->dev->ifindex == oif))
202 continue;
203 }
204 local = sprt;
205 }
206 }
207
208 if (local)
209 return local;
210
211 if (strict)
212 return &ip6_null_entry;
213 }
214 return rt;
215}
216
217/*
218 * pointer to the last default router chosen. BH is disabled locally.
219 */
220static struct rt6_info *rt6_dflt_pointer;
221static DEFINE_SPINLOCK(rt6_dflt_lock);
222
223void rt6_reset_dflt_pointer(struct rt6_info *rt)
224{
225 spin_lock_bh(&rt6_dflt_lock);
226 if (rt == NULL || rt == rt6_dflt_pointer) {
227 RT6_TRACE("reset default router: %p->NULL\n", rt6_dflt_pointer);
228 rt6_dflt_pointer = NULL;
229 }
230 spin_unlock_bh(&rt6_dflt_lock);
231}
232
233/* Default Router Selection (RFC 2461 6.3.6) */
234static struct rt6_info *rt6_best_dflt(struct rt6_info *rt, int oif)
235{
236 struct rt6_info *match = NULL;
237 struct rt6_info *sprt;
238 int mpri = 0;
239
240 for (sprt = rt; sprt; sprt = sprt->u.next) {
241 struct neighbour *neigh;
242 int m = 0;
243
244 if (!oif ||
245 (sprt->rt6i_dev &&
246 sprt->rt6i_dev->ifindex == oif))
247 m += 8;
248
249 if (rt6_check_expired(sprt))
250 continue;
251
252 if (sprt == rt6_dflt_pointer)
253 m += 4;
254
255 if ((neigh = sprt->rt6i_nexthop) != NULL) {
256 read_lock_bh(&neigh->lock);
257 switch (neigh->nud_state) {
258 case NUD_REACHABLE:
259 m += 3;
260 break;
261
262 case NUD_STALE:
263 case NUD_DELAY:
264 case NUD_PROBE:
265 m += 2;
266 break;
267
268 case NUD_NOARP:
269 case NUD_PERMANENT:
270 m += 1;
271 break;
272
273 case NUD_INCOMPLETE:
274 default:
275 read_unlock_bh(&neigh->lock);
276 continue;
277 }
278 read_unlock_bh(&neigh->lock);
279 } else {
280 continue;
281 }
282
283 if (m > mpri || m >= 12) {
284 match = sprt;
285 mpri = m;
286 if (m >= 12) {
287 /* we choose the last default router if it
288 * is in (probably) reachable state.
289 * If route changed, we should do pmtu
290 * discovery. --yoshfuji
291 */
292 break;
293 }
294 }
295 }
296
297 spin_lock(&rt6_dflt_lock);
298 if (!match) {
299 /*
300 * No default routers are known to be reachable.
301 * SHOULD round robin
302 */
303 if (rt6_dflt_pointer) {
304 for (sprt = rt6_dflt_pointer->u.next;
305 sprt; sprt = sprt->u.next) {
306 if (sprt->u.dst.obsolete <= 0 &&
307 sprt->u.dst.error == 0 &&
308 !rt6_check_expired(sprt)) {
309 match = sprt;
310 break;
311 }
312 }
313 for (sprt = rt;
314 !match && sprt;
315 sprt = sprt->u.next) {
316 if (sprt->u.dst.obsolete <= 0 &&
317 sprt->u.dst.error == 0 &&
318 !rt6_check_expired(sprt)) {
319 match = sprt;
320 break;
321 }
322 if (sprt == rt6_dflt_pointer)
323 break;
324 }
325 }
326 }
327
328 if (match) {
329 if (rt6_dflt_pointer != match)
330 RT6_TRACE("changed default router: %p->%p\n",
331 rt6_dflt_pointer, match);
332 rt6_dflt_pointer = match;
333 }
334 spin_unlock(&rt6_dflt_lock);
335
336 if (!match) {
337 /*
338 * Last Resort: if no default routers found,
339 * use addrconf default route.
340 * We don't record this route.
341 */
342 for (sprt = ip6_routing_table.leaf;
343 sprt; sprt = sprt->u.next) {
344 if (!rt6_check_expired(sprt) &&
345 (sprt->rt6i_flags & RTF_DEFAULT) &&
346 (!oif ||
347 (sprt->rt6i_dev &&
348 sprt->rt6i_dev->ifindex == oif))) {
349 match = sprt;
350 break;
351 }
352 }
353 if (!match) {
354 /* no default route. give up. */
355 match = &ip6_null_entry;
356 }
357 }
358
359 return match;
360}
361
362struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
363 int oif, int strict)
364{
365 struct fib6_node *fn;
366 struct rt6_info *rt;
367
368 read_lock_bh(&rt6_lock);
369 fn = fib6_lookup(&ip6_routing_table, daddr, saddr);
370 rt = rt6_device_match(fn->leaf, oif, strict);
371 dst_hold(&rt->u.dst);
372 rt->u.dst.__use++;
373 read_unlock_bh(&rt6_lock);
374
375 rt->u.dst.lastuse = jiffies;
376 if (rt->u.dst.error == 0)
377 return rt;
378 dst_release(&rt->u.dst);
379 return NULL;
380}
381
382/* ip6_ins_rt is called with FREE rt6_lock.
383 It takes new route entry, the addition fails by any reason the
384 route is freed. In any case, if caller does not hold it, it may
385 be destroyed.
386 */
387
0d51aa80
JHS		 388int ip6_ins_rt(struct rt6_info *rt, struct nlmsghdr *nlh,
389 void *_rtattr, struct netlink_skb_parms *req)
1da177e4
LT		 390{
391 int err;
392
393 write_lock_bh(&rt6_lock);
0d51aa80 394 err = fib6_add(&ip6_routing_table, rt, nlh, _rtattr, req);
1da177e4
LT		 395 write_unlock_bh(&rt6_lock);
396
397 return err;
398}
399
400/* No rt6_lock! If COW failed, the function returns dead route entry
401 with dst->error set to errno value.
402 */
403
95a9a5ba
YH		 404static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
405 struct in6_addr *saddr)
1da177e4 406{
1da177e4
LT		 407 struct rt6_info *rt;
408
409 /*
410 * Clone the route.
411 */
412
413 rt = ip6_rt_copy(ort);
414
415 if (rt) {
58c4fb86
YH		 416 if (!(rt->rt6i_flags&RTF_GATEWAY)) {
417 if (rt->rt6i_dst.plen != 128 &&
418 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr))
419 rt->rt6i_flags |= RTF_ANYCAST;
1da177e4 420 ipv6_addr_copy(&rt->rt6i_gateway, daddr);
58c4fb86 421 }
1da177e4 422
58c4fb86 423 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
1da177e4
LT		 424 rt->rt6i_dst.plen = 128;
425 rt->rt6i_flags |= RTF_CACHE;
426 rt->u.dst.flags |= DST_HOST;
427
428#ifdef CONFIG_IPV6_SUBTREES
429 if (rt->rt6i_src.plen && saddr) {
430 ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
431 rt->rt6i_src.plen = 128;
432 }
433#endif
434
435 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
436
95a9a5ba 437 }
1da177e4 438
95a9a5ba
YH		 439 return rt;
440}
1da177e4 441
95a9a5ba
YH		 442static struct rt6_info *rt6_cow(struct rt6_info *ort, struct in6_addr *daddr,
443 struct in6_addr *saddr, struct netlink_skb_parms *req)
444{
445 struct rt6_info *rt = rt6_alloc_cow(ort, daddr, saddr);
446 int err;
1da177e4 447
95a9a5ba
YH		 448 if (!rt) {
449 dst_hold(&ip6_null_entry.u.dst);
450 return &ip6_null_entry;
1da177e4 451 }
95a9a5ba
YH		 452
453 dst_hold(&rt->u.dst);
454
455 err = ip6_ins_rt(rt, NULL, NULL, req);
456 if (err)
457 rt->u.dst.error = err;
458
459 return rt;
1da177e4
LT		 460}
461
299d9939
YH		 462static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr)
463{
464 struct rt6_info *rt = ip6_rt_copy(ort);
465 if (rt) {
466 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
467 rt->rt6i_dst.plen = 128;
468 rt->rt6i_flags |= RTF_CACHE;
469 if (rt->rt6i_flags & RTF_REJECT)
470 rt->u.dst.error = ort->u.dst.error;
471 rt->u.dst.flags |= DST_HOST;
472 rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
473 }
474 return rt;
475}
476
1da177e4
LT		 477#define BACKTRACK() \
478if (rt == &ip6_null_entry && strict) { \
479 while ((fn = fn->parent) != NULL) { \
480 if (fn->fn_flags & RTN_ROOT) { \
481 dst_hold(&rt->u.dst); \
482 goto out; \
483 } \
484 if (fn->fn_flags & RTN_RTINFO) \
485 goto restart; \
486 } \
487}
488
489
490void ip6_route_input(struct sk_buff *skb)
491{
492 struct fib6_node *fn;
493 struct rt6_info *rt;
494 int strict;
495 int attempts = 3;
496
497 strict = ipv6_addr_type(&skb->nh.ipv6h->daddr) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL);
498
499relookup:
500 read_lock_bh(&rt6_lock);
501
502 fn = fib6_lookup(&ip6_routing_table, &skb->nh.ipv6h->daddr,
503 &skb->nh.ipv6h->saddr);
504
505restart:
506 rt = fn->leaf;
507
508 if ((rt->rt6i_flags & RTF_CACHE)) {
509 rt = rt6_device_match(rt, skb->dev->ifindex, strict);
510 BACKTRACK();
511 dst_hold(&rt->u.dst);
512 goto out;
513 }
514
9d17f218 515 rt = rt6_device_match(rt, skb->dev->ifindex, strict);
1da177e4
LT		 516 BACKTRACK();
517
518 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
519 struct rt6_info *nrt;
520 dst_hold(&rt->u.dst);
521 read_unlock_bh(&rt6_lock);
522
523 nrt = rt6_cow(rt, &skb->nh.ipv6h->daddr,
0d51aa80
JHS		 524 &skb->nh.ipv6h->saddr,
525 &NETLINK_CB(skb));
1da177e4
LT		 526
527 dst_release(&rt->u.dst);
528 rt = nrt;
529
530 if (rt->u.dst.error != -EEXIST || --attempts <= 0)
531 goto out2;
532
533 /* Race condition! In the gap, when rt6_lock was
534 released someone could insert this route. Relookup.
535 */
536 dst_release(&rt->u.dst);
537 goto relookup;
538 }
539 dst_hold(&rt->u.dst);
540
541out:
542 read_unlock_bh(&rt6_lock);
543out2:
544 rt->u.dst.lastuse = jiffies;
545 rt->u.dst.__use++;
546 skb->dst = (struct dst_entry *) rt;
547}
548
549struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
550{
551 struct fib6_node *fn;
552 struct rt6_info *rt;
553 int strict;
554 int attempts = 3;
555
556 strict = ipv6_addr_type(&fl->fl6_dst) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL);
557
558relookup:
559 read_lock_bh(&rt6_lock);
560
561 fn = fib6_lookup(&ip6_routing_table, &fl->fl6_dst, &fl->fl6_src);
562
563restart:
564 rt = fn->leaf;
565
566 if ((rt->rt6i_flags & RTF_CACHE)) {
567 rt = rt6_device_match(rt, fl->oif, strict);
568 BACKTRACK();
569 dst_hold(&rt->u.dst);
570 goto out;
571 }
572 if (rt->rt6i_flags & RTF_DEFAULT) {
573 if (rt->rt6i_metric >= IP6_RT_PRIO_ADDRCONF)
574 rt = rt6_best_dflt(rt, fl->oif);
575 } else {
576 rt = rt6_device_match(rt, fl->oif, strict);
577 BACKTRACK();
578 }
579
580 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
581 struct rt6_info *nrt;
582 dst_hold(&rt->u.dst);
583 read_unlock_bh(&rt6_lock);
584
0d51aa80 585 nrt = rt6_cow(rt, &fl->fl6_dst, &fl->fl6_src, NULL);
1da177e4
LT		 586
587 dst_release(&rt->u.dst);
588 rt = nrt;
589
590 if (rt->u.dst.error != -EEXIST || --attempts <= 0)
591 goto out2;
592
593 /* Race condition! In the gap, when rt6_lock was
594 released someone could insert this route. Relookup.
595 */
596 dst_release(&rt->u.dst);
597 goto relookup;
598 }
599 dst_hold(&rt->u.dst);
600
601out:
602 read_unlock_bh(&rt6_lock);
603out2:
604 rt->u.dst.lastuse = jiffies;
605 rt->u.dst.__use++;
606 return &rt->u.dst;
607}
608
609
610/*
611 * Destination cache support functions
612 */
613
614static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
615{
616 struct rt6_info *rt;
617
618 rt = (struct rt6_info *) dst;
619
620 if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
621 return dst;
622
623 return NULL;
624}
625
626static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
627{
628 struct rt6_info *rt = (struct rt6_info *) dst;
629
630 if (rt) {
631 if (rt->rt6i_flags & RTF_CACHE)
0d51aa80 632 ip6_del_rt(rt, NULL, NULL, NULL);
1da177e4
LT		 633 else
634 dst_release(dst);
635 }
636 return NULL;
637}
638
639static void ip6_link_failure(struct sk_buff *skb)
640{
641 struct rt6_info *rt;
642
643 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
644
645 rt = (struct rt6_info *) skb->dst;
646 if (rt) {
647 if (rt->rt6i_flags&RTF_CACHE) {
648 dst_set_expires(&rt->u.dst, 0);
649 rt->rt6i_flags |= RTF_EXPIRES;
650 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
651 rt->rt6i_node->fn_sernum = -1;
652 }
653}
654
655static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
656{
657 struct rt6_info *rt6 = (struct rt6_info*)dst;
658
659 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
660 rt6->rt6i_flags |= RTF_MODIFIED;
661 if (mtu < IPV6_MIN_MTU) {
662 mtu = IPV6_MIN_MTU;
663 dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
664 }
665 dst->metrics[RTAX_MTU-1] = mtu;
666 }
667}
668
669/* Protected by rt6_lock. */
670static struct dst_entry *ndisc_dst_gc_list;
671static int ipv6_get_mtu(struct net_device *dev);
672
673static inline unsigned int ipv6_advmss(unsigned int mtu)
674{
675 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
676
677 if (mtu < ip6_rt_min_advmss)
678 mtu = ip6_rt_min_advmss;
679
680 /*
681 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
682 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
683 * IPV6_MAXPLEN is also valid and means: "any MSS,
684 * rely only on pmtu discovery"
685 */
686 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
687 mtu = IPV6_MAXPLEN;
688 return mtu;
689}
690
691struct dst_entry *ndisc_dst_alloc(struct net_device *dev,
692 struct neighbour *neigh,
693 struct in6_addr *addr,
694 int (*output)(struct sk_buff *))
695{
696 struct rt6_info *rt;
697 struct inet6_dev *idev = in6_dev_get(dev);
698
699 if (unlikely(idev == NULL))
700 return NULL;
701
702 rt = ip6_dst_alloc();
703 if (unlikely(rt == NULL)) {
704 in6_dev_put(idev);
705 goto out;
706 }
707
708 dev_hold(dev);
709 if (neigh)
710 neigh_hold(neigh);
711 else
712 neigh = ndisc_get_neigh(dev, addr);
713
714 rt->rt6i_dev = dev;
715 rt->rt6i_idev = idev;
716 rt->rt6i_nexthop = neigh;
717 atomic_set(&rt->u.dst.__refcnt, 1);
718 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
719 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
720 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
721 rt->u.dst.output = output;
722
723#if 0 /* there's no chance to use these for ndisc */
724 rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
725 ? DST_HOST
726 : 0;
727 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
728 rt->rt6i_dst.plen = 128;
729#endif
730
731 write_lock_bh(&rt6_lock);
732 rt->u.dst.next = ndisc_dst_gc_list;
733 ndisc_dst_gc_list = &rt->u.dst;
734 write_unlock_bh(&rt6_lock);
735
736 fib6_force_start_gc();
737
738out:
739 return (struct dst_entry *)rt;
740}
741
742int ndisc_dst_gc(int *more)
743{
744 struct dst_entry *dst, *next, **pprev;
745 int freed;
746
747 next = NULL;
748 pprev = &ndisc_dst_gc_list;
749 freed = 0;
750 while ((dst = *pprev) != NULL) {
751 if (!atomic_read(&dst->__refcnt)) {
752 *pprev = dst->next;
753 dst_free(dst);
754 freed++;
755 } else {
756 pprev = &dst->next;
757 (*more)++;
758 }
759 }
760
761 return freed;
762}
763
764static int ip6_dst_gc(void)
765{
766 static unsigned expire = 30*HZ;
767 static unsigned long last_gc;
768 unsigned long now = jiffies;
769
770 if (time_after(last_gc + ip6_rt_gc_min_interval, now) &&
771 atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size)
772 goto out;
773
774 expire++;
775 fib6_run_gc(expire);
776 last_gc = now;
777 if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh)
778 expire = ip6_rt_gc_timeout>>1;
779
780out:
781 expire -= expire>>ip6_rt_gc_elasticity;
782 return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size);
783}
784
785/* Clean host part of a prefix. Not necessary in radix tree,
786 but results in cleaner routing tables.
787
788 Remove it only when all the things will work!
789 */
790
791static int ipv6_get_mtu(struct net_device *dev)
792{
793 int mtu = IPV6_MIN_MTU;
794 struct inet6_dev *idev;
795
796 idev = in6_dev_get(dev);
797 if (idev) {
798 mtu = idev->cnf.mtu6;
799 in6_dev_put(idev);
800 }
801 return mtu;
802}
803
804int ipv6_get_hoplimit(struct net_device *dev)
805{
806 int hoplimit = ipv6_devconf.hop_limit;
807 struct inet6_dev *idev;
808
809 idev = in6_dev_get(dev);
810 if (idev) {
811 hoplimit = idev->cnf.hop_limit;
812 in6_dev_put(idev);
813 }
814 return hoplimit;
815}
816
817/*
818 *
819 */
820
0d51aa80
JHS		 821int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh,
822 void *_rtattr, struct netlink_skb_parms *req)
1da177e4
LT		 823{
824 int err;
825 struct rtmsg *r;
826 struct rtattr **rta;
827 struct rt6_info *rt = NULL;
828 struct net_device *dev = NULL;
829 struct inet6_dev *idev = NULL;
830 int addr_type;
831
832 rta = (struct rtattr **) _rtattr;
833
834 if (rtmsg->rtmsg_dst_len > 128 || rtmsg->rtmsg_src_len > 128)
835 return -EINVAL;
836#ifndef CONFIG_IPV6_SUBTREES
837 if (rtmsg->rtmsg_src_len)
838 return -EINVAL;
839#endif
840 if (rtmsg->rtmsg_ifindex) {
841 err = -ENODEV;
842 dev = dev_get_by_index(rtmsg->rtmsg_ifindex);
843 if (!dev)
844 goto out;
845 idev = in6_dev_get(dev);
846 if (!idev)
847 goto out;
848 }
849
850 if (rtmsg->rtmsg_metric == 0)
851 rtmsg->rtmsg_metric = IP6_RT_PRIO_USER;
852
853 rt = ip6_dst_alloc();
854
855 if (rt == NULL) {
856 err = -ENOMEM;
857 goto out;
858 }
859
860 rt->u.dst.obsolete = -1;
3dd4bc68 861 rt->rt6i_expires = jiffies + clock_t_to_jiffies(rtmsg->rtmsg_info);
1da177e4
LT		 862 if (nlh && (r = NLMSG_DATA(nlh))) {
863 rt->rt6i_protocol = r->rtm_protocol;
864 } else {
865 rt->rt6i_protocol = RTPROT_BOOT;
866 }
867
868 addr_type = ipv6_addr_type(&rtmsg->rtmsg_dst);
869
870 if (addr_type & IPV6_ADDR_MULTICAST)
871 rt->u.dst.input = ip6_mc_input;
872 else
873 rt->u.dst.input = ip6_forward;
874
875 rt->u.dst.output = ip6_output;
876
877 ipv6_addr_prefix(&rt->rt6i_dst.addr,
878 &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len);
879 rt->rt6i_dst.plen = rtmsg->rtmsg_dst_len;
880 if (rt->rt6i_dst.plen == 128)
881 rt->u.dst.flags = DST_HOST;
882
883#ifdef CONFIG_IPV6_SUBTREES
884 ipv6_addr_prefix(&rt->rt6i_src.addr,
885 &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len);
886 rt->rt6i_src.plen = rtmsg->rtmsg_src_len;
887#endif
888
889 rt->rt6i_metric = rtmsg->rtmsg_metric;
890
891 /* We cannot add true routes via loopback here,
892 they would result in kernel looping; promote them to reject routes
893 */
894 if ((rtmsg->rtmsg_flags&RTF_REJECT) ||
895 (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
896 /* hold loopback dev/idev if we haven't done so. */
897 if (dev != &loopback_dev) {
898 if (dev) {
899 dev_put(dev);
900 in6_dev_put(idev);
901 }
902 dev = &loopback_dev;
903 dev_hold(dev);
904 idev = in6_dev_get(dev);
905 if (!idev) {
906 err = -ENODEV;
907 goto out;
908 }
909 }
910 rt->u.dst.output = ip6_pkt_discard_out;
911 rt->u.dst.input = ip6_pkt_discard;
912 rt->u.dst.error = -ENETUNREACH;
913 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
914 goto install_route;
915 }
916
917 if (rtmsg->rtmsg_flags & RTF_GATEWAY) {
918 struct in6_addr *gw_addr;
919 int gwa_type;
920
921 gw_addr = &rtmsg->rtmsg_gateway;
922 ipv6_addr_copy(&rt->rt6i_gateway, &rtmsg->rtmsg_gateway);
923 gwa_type = ipv6_addr_type(gw_addr);
924
925 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
926 struct rt6_info *grt;
927
928 /* IPv6 strictly inhibits using not link-local
929 addresses as nexthop address.
930 Otherwise, router will not able to send redirects.
931 It is very good, but in some (rare!) circumstances
932 (SIT, PtP, NBMA NOARP links) it is handy to allow
933 some exceptions. --ANK
934 */
935 err = -EINVAL;
936 if (!(gwa_type&IPV6_ADDR_UNICAST))
937 goto out;
938
939 grt = rt6_lookup(gw_addr, NULL, rtmsg->rtmsg_ifindex, 1);
940
941 err = -EHOSTUNREACH;
942 if (grt == NULL)
943 goto out;
944 if (dev) {
945 if (dev != grt->rt6i_dev) {
946 dst_release(&grt->u.dst);
947 goto out;
948 }
949 } else {
950 dev = grt->rt6i_dev;
951 idev = grt->rt6i_idev;
952 dev_hold(dev);
953 in6_dev_hold(grt->rt6i_idev);
954 }
955 if (!(grt->rt6i_flags&RTF_GATEWAY))
956 err = 0;
957 dst_release(&grt->u.dst);
958
959 if (err)
960 goto out;
961 }
962 err = -EINVAL;
963 if (dev == NULL || (dev->flags&IFF_LOOPBACK))
964 goto out;
965 }
966
967 err = -ENODEV;
968 if (dev == NULL)
969 goto out;
970
971 if (rtmsg->rtmsg_flags & (RTF_GATEWAY|RTF_NONEXTHOP)) {
972 rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
973 if (IS_ERR(rt->rt6i_nexthop)) {
974 err = PTR_ERR(rt->rt6i_nexthop);
975 rt->rt6i_nexthop = NULL;
976 goto out;
977 }
978 }
979
980 rt->rt6i_flags = rtmsg->rtmsg_flags;
981
982install_route:
983 if (rta && rta[RTA_METRICS-1]) {
984 int attrlen = RTA_PAYLOAD(rta[RTA_METRICS-1]);
985 struct rtattr *attr = RTA_DATA(rta[RTA_METRICS-1]);
986
987 while (RTA_OK(attr, attrlen)) {
988 unsigned flavor = attr->rta_type;
989 if (flavor) {
990 if (flavor > RTAX_MAX) {
991 err = -EINVAL;
992 goto out;
993 }
994 rt->u.dst.metrics[flavor-1] =
995 *(u32 *)RTA_DATA(attr);
996 }
997 attr = RTA_NEXT(attr, attrlen);
998 }
999 }
1000
1001 if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
1002 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1003 if (!rt->u.dst.metrics[RTAX_MTU-1])
1004 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
1005 if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
1006 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
1007 rt->u.dst.dev = dev;
1008 rt->rt6i_idev = idev;
0d51aa80 1009 return ip6_ins_rt(rt, nlh, _rtattr, req);
1da177e4
LT		 1010
1011out:
1012 if (dev)
1013 dev_put(dev);
1014 if (idev)
1015 in6_dev_put(idev);
1016 if (rt)
1017 dst_free((struct dst_entry *) rt);
1018 return err;
1019}
1020
0d51aa80 1021int ip6_del_rt(struct rt6_info *rt, struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req)
1da177e4
LT		 1022{
1023 int err;
1024
1025 write_lock_bh(&rt6_lock);
1026
1027 rt6_reset_dflt_pointer(NULL);
1028
0d51aa80 1029 err = fib6_del(rt, nlh, _rtattr, req);
1da177e4
LT		 1030 dst_release(&rt->u.dst);
1031
1032 write_unlock_bh(&rt6_lock);
1033
1034 return err;
1035}
1036
0d51aa80 1037static int ip6_route_del(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req)
1da177e4
LT		 1038{
1039 struct fib6_node *fn;
1040 struct rt6_info *rt;
1041 int err = -ESRCH;
1042
1043 read_lock_bh(&rt6_lock);
1044
1045 fn = fib6_locate(&ip6_routing_table,
1046 &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len,
1047 &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len);
1048
1049 if (fn) {
1050 for (rt = fn->leaf; rt; rt = rt->u.next) {
1051 if (rtmsg->rtmsg_ifindex &&
1052 (rt->rt6i_dev == NULL ||
1053 rt->rt6i_dev->ifindex != rtmsg->rtmsg_ifindex))
1054 continue;
1055 if (rtmsg->rtmsg_flags&RTF_GATEWAY &&
1056 !ipv6_addr_equal(&rtmsg->rtmsg_gateway, &rt->rt6i_gateway))
1057 continue;
1058 if (rtmsg->rtmsg_metric &&
1059 rtmsg->rtmsg_metric != rt->rt6i_metric)
1060 continue;
1061 dst_hold(&rt->u.dst);
1062 read_unlock_bh(&rt6_lock);
1063
0d51aa80 1064 return ip6_del_rt(rt, nlh, _rtattr, req);
1da177e4
LT		 1065 }
1066 }
1067 read_unlock_bh(&rt6_lock);
1068
1069 return err;
1070}
1071
1072/*
1073 * Handle redirects
1074 */
1075void rt6_redirect(struct in6_addr *dest, struct in6_addr *saddr,
1076 struct neighbour *neigh, u8 *lladdr, int on_link)
1077{
1078 struct rt6_info *rt, *nrt;
1079
1080 /* Locate old route to this destination. */
1081 rt = rt6_lookup(dest, NULL, neigh->dev->ifindex, 1);
1082
1083 if (rt == NULL)
1084 return;
1085
1086 if (neigh->dev != rt->rt6i_dev)
1087 goto out;
1088
1089 /*
1090 * Current route is on-link; redirect is always invalid.
1091 *
1092 * Seems, previous statement is not true. It could
1093 * be node, which looks for us as on-link (f.e. proxy ndisc)
1094 * But then router serving it might decide, that we should
1095 * know truth 8)8) --ANK (980726).
1096 */
1097 if (!(rt->rt6i_flags&RTF_GATEWAY))
1098 goto out;
1099
1100 /*
1101 * RFC 2461 specifies that redirects should only be
1102 * accepted if they come from the nexthop to the target.
1103 * Due to the way default routers are chosen, this notion
1104 * is a bit fuzzy and one might need to check all default
1105 * routers.
1106 */
1107 if (!ipv6_addr_equal(saddr, &rt->rt6i_gateway)) {
1108 if (rt->rt6i_flags & RTF_DEFAULT) {
1109 struct rt6_info *rt1;
1110
1111 read_lock(&rt6_lock);
1112 for (rt1 = ip6_routing_table.leaf; rt1; rt1 = rt1->u.next) {
1113 if (ipv6_addr_equal(saddr, &rt1->rt6i_gateway)) {
1114 dst_hold(&rt1->u.dst);
1115 dst_release(&rt->u.dst);
1116 read_unlock(&rt6_lock);
1117 rt = rt1;
1118 goto source_ok;
1119 }
1120 }
1121 read_unlock(&rt6_lock);
1122 }
1123 if (net_ratelimit())
1124 printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
1125 "for redirect target\n");
1126 goto out;
1127 }
1128
1129source_ok:
1130
1131 /*
1132 * We have finally decided to accept it.
1133 */
1134
1135 neigh_update(neigh, lladdr, NUD_STALE,
1136 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1137 NEIGH_UPDATE_F_OVERRIDE|
1138 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1139 NEIGH_UPDATE_F_ISROUTER))
1140 );
1141
1142 /*
1143 * Redirect received -> path was valid.
1144 * Look, redirects are sent only in response to data packets,
1145 * so that this nexthop apparently is reachable. --ANK
1146 */
1147 dst_confirm(&rt->u.dst);
1148
1149 /* Duplicate redirect: silently ignore. */
1150 if (neigh == rt->u.dst.neighbour)
1151 goto out;
1152
1153 nrt = ip6_rt_copy(rt);
1154 if (nrt == NULL)
1155 goto out;
1156
1157 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1158 if (on_link)
1159 nrt->rt6i_flags &= ~RTF_GATEWAY;
1160
1161 ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
1162 nrt->rt6i_dst.plen = 128;
1163 nrt->u.dst.flags |= DST_HOST;
1164
1165 ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
1166 nrt->rt6i_nexthop = neigh_clone(neigh);
1167 /* Reset pmtu, it may be better */
1168 nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
1169 nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst));
1170
0d51aa80 1171 if (ip6_ins_rt(nrt, NULL, NULL, NULL))
1da177e4
LT		 1172 goto out;
1173
1174 if (rt->rt6i_flags&RTF_CACHE) {
0d51aa80 1175 ip6_del_rt(rt, NULL, NULL, NULL);
1da177e4
LT		 1176 return;
1177 }
1178
1179out:
1180 dst_release(&rt->u.dst);
1181 return;
1182}
1183
1184/*
1185 * Handle ICMP "packet too big" messages
1186 * i.e. Path MTU discovery
1187 */
1188
1189void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
1190 struct net_device *dev, u32 pmtu)
1191{
1192 struct rt6_info *rt, *nrt;
1193 int allfrag = 0;
1194
1195 rt = rt6_lookup(daddr, saddr, dev->ifindex, 0);
1196 if (rt == NULL)
1197 return;
1198
1199 if (pmtu >= dst_mtu(&rt->u.dst))
1200 goto out;
1201
1202 if (pmtu < IPV6_MIN_MTU) {
1203 /*
1204 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
1205 * MTU (1280) and a fragment header should always be included
1206 * after a node receiving Too Big message reporting PMTU is
1207 * less than the IPv6 Minimum Link MTU.
1208 */
1209 pmtu = IPV6_MIN_MTU;
1210 allfrag = 1;
1211 }
1212
1213 /* New mtu received -> path was valid.
1214 They are sent only in response to data packets,
1215 so that this nexthop apparently is reachable. --ANK
1216 */
1217 dst_confirm(&rt->u.dst);
1218
1219 /* Host route. If it is static, it would be better
1220 not to override it, but add new one, so that
1221 when cache entry will expire old pmtu
1222 would return automatically.
1223 */
1224 if (rt->rt6i_flags & RTF_CACHE) {
1225 rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1226 if (allfrag)
1227 rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1228 dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires);
1229 rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
1230 goto out;
1231 }
1232
1233 /* Network route.
1234 Two cases are possible:
1235 1. It is connected route. Action: COW
1236 2. It is gatewayed route or NONEXTHOP route. Action: clone it.
1237 */
1238 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
a1e78363
YH		 1239 nrt = rt6_alloc_cow(rt, daddr, saddr);
1240 if (!nrt)
1241 goto out;
1242
1243 nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1244 if (allfrag)
1245 nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1246
1247 /* According to RFC 1981, detecting PMTU increase shouldn't be
1248 * happened within 5 mins, the recommended timer is 10 mins.
1249 * Here this route expiration time is set to ip6_rt_mtu_expires
1250 * which is 10 mins. After 10 mins the decreased pmtu is expired
1251 * and detecting PMTU increase will be automatically happened.
1252 */
1253 dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
1254 nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
1255
1256 ip6_ins_rt(nrt, NULL, NULL, NULL);
1da177e4 1257 } else {
299d9939
YH		 1258 nrt = rt6_alloc_clone(rt, daddr);
1259 if (!nrt)
1da177e4 1260 goto out;
1da177e4 1261 dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
299d9939 1262 nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
1da177e4
LT		 1263 nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1264 if (allfrag)
1265 nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
0d51aa80 1266 ip6_ins_rt(nrt, NULL, NULL, NULL);
1da177e4
LT		 1267 }
1268
1269out:
1270 dst_release(&rt->u.dst);
1271}
1272
1273/*
1274 * Misc support functions
1275 */
1276
1277static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
1278{
1279 struct rt6_info *rt = ip6_dst_alloc();
1280
1281 if (rt) {
1282 rt->u.dst.input = ort->u.dst.input;
1283 rt->u.dst.output = ort->u.dst.output;
1284
1285 memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
1286 rt->u.dst.dev = ort->u.dst.dev;
1287 if (rt->u.dst.dev)
1288 dev_hold(rt->u.dst.dev);
1289 rt->rt6i_idev = ort->rt6i_idev;
1290 if (rt->rt6i_idev)
1291 in6_dev_hold(rt->rt6i_idev);
1292 rt->u.dst.lastuse = jiffies;
1293 rt->rt6i_expires = 0;
1294
1295 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
1296 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
1297 rt->rt6i_metric = 0;
1298
1299 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1300#ifdef CONFIG_IPV6_SUBTREES
1301 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1302#endif
1303 }
1304 return rt;
1305}
1306
1307struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
1308{
1309 struct rt6_info *rt;
1310 struct fib6_node *fn;
1311
1312 fn = &ip6_routing_table;
1313
1314 write_lock_bh(&rt6_lock);
1315 for (rt = fn->leaf; rt; rt=rt->u.next) {
1316 if (dev == rt->rt6i_dev &&
1317 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1318 break;
1319 }
1320 if (rt)
1321 dst_hold(&rt->u.dst);
1322 write_unlock_bh(&rt6_lock);
1323 return rt;
1324}
1325
1326struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1327 struct net_device *dev)
1328{
1329 struct in6_rtmsg rtmsg;
1330
1331 memset(&rtmsg, 0, sizeof(struct in6_rtmsg));
1332 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1333 ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr);
1334 rtmsg.rtmsg_metric = 1024;
1335 rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | RTF_UP | RTF_EXPIRES;
1336
1337 rtmsg.rtmsg_ifindex = dev->ifindex;
1338
0d51aa80 1339 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1da177e4
LT		 1340 return rt6_get_dflt_router(gwaddr, dev);
1341}
1342
1343void rt6_purge_dflt_routers(void)
1344{
1345 struct rt6_info *rt;
1346
1347restart:
1348 read_lock_bh(&rt6_lock);
1349 for (rt = ip6_routing_table.leaf; rt; rt = rt->u.next) {
1350 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
1351 dst_hold(&rt->u.dst);
1352
1353 rt6_reset_dflt_pointer(NULL);
1354
1355 read_unlock_bh(&rt6_lock);
1356
0d51aa80 1357 ip6_del_rt(rt, NULL, NULL, NULL);
1da177e4
LT		 1358
1359 goto restart;
1360 }
1361 }
1362 read_unlock_bh(&rt6_lock);
1363}
1364
1365int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
1366{
1367 struct in6_rtmsg rtmsg;
1368 int err;
1369
1370 switch(cmd) {
1371 case SIOCADDRT: /* Add a route */
1372 case SIOCDELRT: /* Delete a route */
1373 if (!capable(CAP_NET_ADMIN))
1374 return -EPERM;
1375 err = copy_from_user(&rtmsg, arg,
1376 sizeof(struct in6_rtmsg));
1377 if (err)
1378 return -EFAULT;
1379
1380 rtnl_lock();
1381 switch (cmd) {
1382 case SIOCADDRT:
0d51aa80 1383 err = ip6_route_add(&rtmsg, NULL, NULL, NULL);
1da177e4
LT		 1384 break;
1385 case SIOCDELRT:
0d51aa80 1386 err = ip6_route_del(&rtmsg, NULL, NULL, NULL);
1da177e4
LT		 1387 break;
1388 default:
1389 err = -EINVAL;
1390 }
1391 rtnl_unlock();
1392
1393 return err;
1394 };
1395
1396 return -EINVAL;
1397}
1398
1399/*
1400 * Drop the packet on the floor
1401 */
1402
20380731 1403static int ip6_pkt_discard(struct sk_buff *skb)
1da177e4
LT		 1404{
1405 IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
1406 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev);
1407 kfree_skb(skb);
1408 return 0;
1409}
1410
20380731 1411static int ip6_pkt_discard_out(struct sk_buff *skb)
1da177e4
LT		 1412{
1413 skb->dev = skb->dst->dev;
1414 return ip6_pkt_discard(skb);
1415}
1416
1417/*
1418 * Allocate a dst for local (unicast / anycast) address.
1419 */
1420
1421struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
1422 const struct in6_addr *addr,
1423 int anycast)
1424{
1425 struct rt6_info *rt = ip6_dst_alloc();
1426
1427 if (rt == NULL)
1428 return ERR_PTR(-ENOMEM);
1429
1430 dev_hold(&loopback_dev);
1431 in6_dev_hold(idev);
1432
1433 rt->u.dst.flags = DST_HOST;
1434 rt->u.dst.input = ip6_input;
1435 rt->u.dst.output = ip6_output;
1436 rt->rt6i_dev = &loopback_dev;
1437 rt->rt6i_idev = idev;
1438 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
1439 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
1440 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1441 rt->u.dst.obsolete = -1;
1442
1443 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
58c4fb86
YH		 1444 if (anycast)
1445 rt->rt6i_flags |= RTF_ANYCAST;
1446 else
1da177e4
LT		 1447 rt->rt6i_flags |= RTF_LOCAL;
1448 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
1449 if (rt->rt6i_nexthop == NULL) {
1450 dst_free((struct dst_entry *) rt);
1451 return ERR_PTR(-ENOMEM);
1452 }
1453
1454 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
1455 rt->rt6i_dst.plen = 128;
1456
1457 atomic_set(&rt->u.dst.__refcnt, 1);
1458
1459 return rt;
1460}
1461
1462static int fib6_ifdown(struct rt6_info *rt, void *arg)
1463{
1464 if (((void*)rt->rt6i_dev == arg || arg == NULL) &&
1465 rt != &ip6_null_entry) {
1466 RT6_TRACE("deleted by ifdown %p\n", rt);
1467 return -1;
1468 }
1469 return 0;
1470}
1471
1472void rt6_ifdown(struct net_device *dev)
1473{
1474 write_lock_bh(&rt6_lock);
1475 fib6_clean_tree(&ip6_routing_table, fib6_ifdown, 0, dev);
1476 write_unlock_bh(&rt6_lock);
1477}
1478
1479struct rt6_mtu_change_arg
1480{
1481 struct net_device *dev;
1482 unsigned mtu;
1483};
1484
1485static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
1486{
1487 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
1488 struct inet6_dev *idev;
1489
1490 /* In IPv6 pmtu discovery is not optional,
1491 so that RTAX_MTU lock cannot disable it.
1492 We still use this lock to block changes
1493 caused by addrconf/ndisc.
1494 */
1495
1496 idev = __in6_dev_get(arg->dev);
1497 if (idev == NULL)
1498 return 0;
1499
1500 /* For administrative MTU increase, there is no way to discover
1501 IPv6 PMTU increase, so PMTU increase should be updated here.
1502 Since RFC 1981 doesn't include administrative MTU increase
1503 update PMTU increase is a MUST. (i.e. jumbo frame)
1504 */
1505 /*
1506 If new MTU is less than route PMTU, this new MTU will be the
1507 lowest MTU in the path, update the route PMTU to reflect PMTU
1508 decreases; if new MTU is greater than route PMTU, and the
1509 old MTU is the lowest MTU in the path, update the route PMTU
1510 to reflect the increase. In this case if the other nodes' MTU
1511 also have the lowest MTU, TOO BIG MESSAGE will be lead to
1512 PMTU discouvery.
1513 */
1514 if (rt->rt6i_dev == arg->dev &&
1515 !dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
1516 (dst_mtu(&rt->u.dst) > arg->mtu ||
1517 (dst_mtu(&rt->u.dst) < arg->mtu &&
1518 dst_mtu(&rt->u.dst) == idev->cnf.mtu6)))
1519 rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
1520 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
1521 return 0;
1522}
1523
1524void rt6_mtu_change(struct net_device *dev, unsigned mtu)
1525{
1526 struct rt6_mtu_change_arg arg;
1527
1528 arg.dev = dev;
1529 arg.mtu = mtu;
1530 read_lock_bh(&rt6_lock);
1531 fib6_clean_tree(&ip6_routing_table, rt6_mtu_change_route, 0, &arg);
1532 read_unlock_bh(&rt6_lock);
1533}
1534
1535static int inet6_rtm_to_rtmsg(struct rtmsg *r, struct rtattr **rta,
1536 struct in6_rtmsg *rtmsg)
1537{
1538 memset(rtmsg, 0, sizeof(*rtmsg));
1539
1540 rtmsg->rtmsg_dst_len = r->rtm_dst_len;
1541 rtmsg->rtmsg_src_len = r->rtm_src_len;
1542 rtmsg->rtmsg_flags = RTF_UP;
1543 if (r->rtm_type == RTN_UNREACHABLE)
1544 rtmsg->rtmsg_flags |= RTF_REJECT;
1545
1546 if (rta[RTA_GATEWAY-1]) {
1547 if (rta[RTA_GATEWAY-1]->rta_len != RTA_LENGTH(16))
1548 return -EINVAL;
1549 memcpy(&rtmsg->rtmsg_gateway, RTA_DATA(rta[RTA_GATEWAY-1]), 16);
1550 rtmsg->rtmsg_flags |= RTF_GATEWAY;
1551 }
1552 if (rta[RTA_DST-1]) {
1553 if (RTA_PAYLOAD(rta[RTA_DST-1]) < ((r->rtm_dst_len+7)>>3))
1554 return -EINVAL;
1555 memcpy(&rtmsg->rtmsg_dst, RTA_DATA(rta[RTA_DST-1]), ((r->rtm_dst_len+7)>>3));
1556 }
1557 if (rta[RTA_SRC-1]) {
1558 if (RTA_PAYLOAD(rta[RTA_SRC-1]) < ((r->rtm_src_len+7)>>3))
1559 return -EINVAL;
1560 memcpy(&rtmsg->rtmsg_src, RTA_DATA(rta[RTA_SRC-1]), ((r->rtm_src_len+7)>>3));
1561 }
1562 if (rta[RTA_OIF-1]) {
1563 if (rta[RTA_OIF-1]->rta_len != RTA_LENGTH(sizeof(int)))
1564 return -EINVAL;
1565 memcpy(&rtmsg->rtmsg_ifindex, RTA_DATA(rta[RTA_OIF-1]), sizeof(int));
1566 }
1567 if (rta[RTA_PRIORITY-1]) {
1568 if (rta[RTA_PRIORITY-1]->rta_len != RTA_LENGTH(4))
1569 return -EINVAL;
1570 memcpy(&rtmsg->rtmsg_metric, RTA_DATA(rta[RTA_PRIORITY-1]), 4);
1571 }
1572 return 0;
1573}
1574
1575int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1576{
1577 struct rtmsg *r = NLMSG_DATA(nlh);
1578 struct in6_rtmsg rtmsg;
1579
1580 if (inet6_rtm_to_rtmsg(r, arg, &rtmsg))
1581 return -EINVAL;
0d51aa80 1582 return ip6_route_del(&rtmsg, nlh, arg, &NETLINK_CB(skb));
1da177e4
LT		 1583}
1584
1585int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1586{
1587 struct rtmsg *r = NLMSG_DATA(nlh);
1588 struct in6_rtmsg rtmsg;
1589
1590 if (inet6_rtm_to_rtmsg(r, arg, &rtmsg))
1591 return -EINVAL;
0d51aa80 1592 return ip6_route_add(&rtmsg, nlh, arg, &NETLINK_CB(skb));
1da177e4
LT		 1593}
1594
1595struct rt6_rtnl_dump_arg
1596{
1597 struct sk_buff *skb;
1598 struct netlink_callback *cb;
1599};
1600
1601static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
0d51aa80
JHS		 1602 struct in6_addr *dst, struct in6_addr *src,
1603 int iif, int type, u32 pid, u32 seq,
1604 int prefix, unsigned int flags)
1da177e4
LT		 1605{
1606 struct rtmsg *rtm;
1607 struct nlmsghdr *nlh;
1608 unsigned char *b = skb->tail;
1609 struct rta_cacheinfo ci;
1610
1611 if (prefix) { /* user wants prefix routes only */
1612 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
1613 /* success since this is not a prefix route */
1614 return 1;
1615 }
1616 }
1617
b6544c0b 1618 nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*rtm), flags);
1da177e4
LT		 1619 rtm = NLMSG_DATA(nlh);
1620 rtm->rtm_family = AF_INET6;
1621 rtm->rtm_dst_len = rt->rt6i_dst.plen;
1622 rtm->rtm_src_len = rt->rt6i_src.plen;
1623 rtm->rtm_tos = 0;
1624 rtm->rtm_table = RT_TABLE_MAIN;
1625 if (rt->rt6i_flags&RTF_REJECT)
1626 rtm->rtm_type = RTN_UNREACHABLE;
1627 else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
1628 rtm->rtm_type = RTN_LOCAL;
1629 else
1630 rtm->rtm_type = RTN_UNICAST;
1631 rtm->rtm_flags = 0;
1632 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
1633 rtm->rtm_protocol = rt->rt6i_protocol;
1634 if (rt->rt6i_flags&RTF_DYNAMIC)
1635 rtm->rtm_protocol = RTPROT_REDIRECT;
1636 else if (rt->rt6i_flags & RTF_ADDRCONF)
1637 rtm->rtm_protocol = RTPROT_KERNEL;
1638 else if (rt->rt6i_flags&RTF_DEFAULT)
1639 rtm->rtm_protocol = RTPROT_RA;
1640
1641 if (rt->rt6i_flags&RTF_CACHE)
1642 rtm->rtm_flags |= RTM_F_CLONED;
1643
1644 if (dst) {
1645 RTA_PUT(skb, RTA_DST, 16, dst);
1646 rtm->rtm_dst_len = 128;
1647 } else if (rtm->rtm_dst_len)
1648 RTA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
1649#ifdef CONFIG_IPV6_SUBTREES
1650 if (src) {
1651 RTA_PUT(skb, RTA_SRC, 16, src);
1652 rtm->rtm_src_len = 128;
1653 } else if (rtm->rtm_src_len)
1654 RTA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
1655#endif
1656 if (iif)
1657 RTA_PUT(skb, RTA_IIF, 4, &iif);
1658 else if (dst) {
1659 struct in6_addr saddr_buf;
1660 if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
1661 RTA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
1662 }
1663 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
1664 goto rtattr_failure;
1665 if (rt->u.dst.neighbour)
1666 RTA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);
1667 if (rt->u.dst.dev)
1668 RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->rt6i_dev->ifindex);
1669 RTA_PUT(skb, RTA_PRIORITY, 4, &rt->rt6i_metric);
1670 ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse);
1671 if (rt->rt6i_expires)
1672 ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies);
1673 else
1674 ci.rta_expires = 0;
1675 ci.rta_used = rt->u.dst.__use;
1676 ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt);
1677 ci.rta_error = rt->u.dst.error;
1678 ci.rta_id = 0;
1679 ci.rta_ts = 0;
1680 ci.rta_tsage = 0;
1681 RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci);
1682 nlh->nlmsg_len = skb->tail - b;
1683 return skb->len;
1684
1685nlmsg_failure:
1686rtattr_failure:
1687 skb_trim(skb, b - skb->data);
1688 return -1;
1689}
1690
1691static int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1692{
1693 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
1694 int prefix;
1695
1696 if (arg->cb->nlh->nlmsg_len >= NLMSG_LENGTH(sizeof(struct rtmsg))) {
1697 struct rtmsg *rtm = NLMSG_DATA(arg->cb->nlh);
1698 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
1699 } else
1700 prefix = 0;
1701
1702 return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
1703 NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
0d51aa80 1704 prefix, NLM_F_MULTI);
1da177e4
LT		 1705}
1706
1707static int fib6_dump_node(struct fib6_walker_t *w)
1708{
1709 int res;
1710 struct rt6_info *rt;
1711
1712 for (rt = w->leaf; rt; rt = rt->u.next) {
1713 res = rt6_dump_route(rt, w->args);
1714 if (res < 0) {
1715 /* Frame is full, suspend walking */
1716 w->leaf = rt;
1717 return 1;
1718 }
1719 BUG_TRAP(res!=0);
1720 }
1721 w->leaf = NULL;
1722 return 0;
1723}
1724
1725static void fib6_dump_end(struct netlink_callback *cb)
1726{
1727 struct fib6_walker_t *w = (void*)cb->args[0];
1728
1729 if (w) {
1730 cb->args[0] = 0;
1731 fib6_walker_unlink(w);
1732 kfree(w);
1733 }
efacfbcb
HX		 1734 cb->done = (void*)cb->args[1];
1735 cb->args[1] = 0;
1da177e4
LT		 1736}
1737
1738static int fib6_dump_done(struct netlink_callback *cb)
1739{
1740 fib6_dump_end(cb);
a8f74b22 1741 return cb->done ? cb->done(cb) : 0;
1da177e4
LT		 1742}
1743
1744int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
1745{
1746 struct rt6_rtnl_dump_arg arg;
1747 struct fib6_walker_t *w;
1748 int res;
1749
1750 arg.skb = skb;
1751 arg.cb = cb;
1752
1753 w = (void*)cb->args[0];
1754 if (w == NULL) {
1755 /* New dump:
1756 *
1757 * 1. hook callback destructor.
1758 */
1759 cb->args[1] = (long)cb->done;
1760 cb->done = fib6_dump_done;
1761
1762 /*
1763 * 2. allocate and initialize walker.
1764 */
9e147a1c 1765 w = kmalloc(sizeof(*w), GFP_ATOMIC);
1da177e4
LT		 1766 if (w == NULL)
1767 return -ENOMEM;
1768 RT6_TRACE("dump<%p", w);
1769 memset(w, 0, sizeof(*w));
1770 w->root = &ip6_routing_table;
1771 w->func = fib6_dump_node;
1772 w->args = &arg;
1773 cb->args[0] = (long)w;
1774 read_lock_bh(&rt6_lock);
1775 res = fib6_walk(w);
1776 read_unlock_bh(&rt6_lock);
1777 } else {
1778 w->args = &arg;
1779 read_lock_bh(&rt6_lock);
1780 res = fib6_walk_continue(w);
1781 read_unlock_bh(&rt6_lock);
1782 }
1783#if RT6_DEBUG >= 3
1784 if (res <= 0 && skb->len == 0)
1785 RT6_TRACE("%p>dump end\n", w);
1786#endif
1787 res = res < 0 ? res : skb->len;
1788 /* res < 0 is an error. (really, impossible)
1789 res == 0 means that dump is complete, but skb still can contain data.
1790 res > 0 dump is not complete, but frame is full.
1791 */
1792 /* Destroy walker, if dump of this table is complete. */
1793 if (res <= 0)
1794 fib6_dump_end(cb);
1795 return res;
1796}
1797
1798int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
1799{
1800 struct rtattr **rta = arg;
1801 int iif = 0;
1802 int err = -ENOBUFS;
1803 struct sk_buff *skb;
1804 struct flowi fl;
1805 struct rt6_info *rt;
1806
1807 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1808 if (skb == NULL)
1809 goto out;
1810
1811 /* Reserve room for dummy headers, this skb can pass
1812 through good chunk of routing engine.
1813 */
1814 skb->mac.raw = skb->data;
1815 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1816
1817 memset(&fl, 0, sizeof(fl));
1818 if (rta[RTA_SRC-1])
1819 ipv6_addr_copy(&fl.fl6_src,
1820 (struct in6_addr*)RTA_DATA(rta[RTA_SRC-1]));
1821 if (rta[RTA_DST-1])
1822 ipv6_addr_copy(&fl.fl6_dst,
1823 (struct in6_addr*)RTA_DATA(rta[RTA_DST-1]));
1824
1825 if (rta[RTA_IIF-1])
1826 memcpy(&iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
1827
1828 if (iif) {
1829 struct net_device *dev;
1830 dev = __dev_get_by_index(iif);
1831 if (!dev) {
1832 err = -ENODEV;
1833 goto out_free;
1834 }
1835 }
1836
1837 fl.oif = 0;
1838 if (rta[RTA_OIF-1])
1839 memcpy(&fl.oif, RTA_DATA(rta[RTA_OIF-1]), sizeof(int));
1840
1841 rt = (struct rt6_info*)ip6_route_output(NULL, &fl);
1842
1843 skb->dst = &rt->u.dst;
1844
1845 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
1846 err = rt6_fill_node(skb, rt,
1847 &fl.fl6_dst, &fl.fl6_src,
1848 iif,
1849 RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
0d51aa80 1850 nlh->nlmsg_seq, 0, 0);
1da177e4
LT		 1851 if (err < 0) {
1852 err = -EMSGSIZE;
1853 goto out_free;
1854 }
1855
1856 err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
1857 if (err > 0)
1858 err = 0;
1859out:
1860 return err;
1861out_free:
1862 kfree_skb(skb);
1863 goto out;
1864}
1865
0d51aa80
JHS		 1866void inet6_rt_notify(int event, struct rt6_info *rt, struct nlmsghdr *nlh,
1867 struct netlink_skb_parms *req)
1da177e4
LT		 1868{
1869 struct sk_buff *skb;
1870 int size = NLMSG_SPACE(sizeof(struct rtmsg)+256);
0d51aa80
JHS		 1871 u32 pid = current->pid;
1872 u32 seq = 0;
1da177e4 1873
0d51aa80
JHS		 1874 if (req)
1875 pid = req->pid;
1876 if (nlh)
1877 seq = nlh->nlmsg_seq;
1878
1da177e4
LT		 1879 skb = alloc_skb(size, gfp_any());
1880 if (!skb) {
ac6d439d 1881 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_ROUTE, ENOBUFS);
1da177e4
LT		 1882 return;
1883 }
0d51aa80 1884 if (rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0) < 0) {
1da177e4 1885 kfree_skb(skb);
ac6d439d 1886 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_ROUTE, EINVAL);
1da177e4
LT		 1887 return;
1888 }
ac6d439d
PM		 1889 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_ROUTE;
1890 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_ROUTE, gfp_any());
1da177e4
LT		 1891}
1892
1893/*
1894 * /proc
1895 */
1896
1897#ifdef CONFIG_PROC_FS
1898
1899#define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1)
1900
1901struct rt6_proc_arg
1902{
1903 char *buffer;
1904 int offset;
1905 int length;
1906 int skip;
1907 int len;
1908};
1909
1910static int rt6_info_route(struct rt6_info *rt, void *p_arg)
1911{
1912 struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg;
1913 int i;
1914
1915 if (arg->skip < arg->offset / RT6_INFO_LEN) {
1916 arg->skip++;
1917 return 0;
1918 }
1919
1920 if (arg->len >= arg->length)
1921 return 0;
1922
1923 for (i=0; i<16; i++) {
1924 sprintf(arg->buffer + arg->len, "%02x",
1925 rt->rt6i_dst.addr.s6_addr[i]);
1926 arg->len += 2;
1927 }
1928 arg->len += sprintf(arg->buffer + arg->len, " %02x ",
1929 rt->rt6i_dst.plen);
1930
1931#ifdef CONFIG_IPV6_SUBTREES
1932 for (i=0; i<16; i++) {
1933 sprintf(arg->buffer + arg->len, "%02x",
1934 rt->rt6i_src.addr.s6_addr[i]);
1935 arg->len += 2;
1936 }
1937 arg->len += sprintf(arg->buffer + arg->len, " %02x ",
1938 rt->rt6i_src.plen);
1939#else
1940 sprintf(arg->buffer + arg->len,
1941 "00000000000000000000000000000000 00 ");
1942 arg->len += 36;
1943#endif
1944
1945 if (rt->rt6i_nexthop) {
1946 for (i=0; i<16; i++) {
1947 sprintf(arg->buffer + arg->len, "%02x",
1948 rt->rt6i_nexthop->primary_key[i]);
1949 arg->len += 2;
1950 }
1951 } else {
1952 sprintf(arg->buffer + arg->len,
1953 "00000000000000000000000000000000");
1954 arg->len += 32;
1955 }
1956 arg->len += sprintf(arg->buffer + arg->len,
1957 " %08x %08x %08x %08x %8s\n",
1958 rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
1959 rt->u.dst.__use, rt->rt6i_flags,
1960 rt->rt6i_dev ? rt->rt6i_dev->name : "");
1961 return 0;
1962}
1963
1964static int rt6_proc_info(char *buffer, char **start, off_t offset, int length)
1965{
1966 struct rt6_proc_arg arg;
1967 arg.buffer = buffer;
1968 arg.offset = offset;
1969 arg.length = length;
1970 arg.skip = 0;
1971 arg.len = 0;
1972
1973 read_lock_bh(&rt6_lock);
1974 fib6_clean_tree(&ip6_routing_table, rt6_info_route, 0, &arg);
1975 read_unlock_bh(&rt6_lock);
1976
1977 *start = buffer;
1978 if (offset)
1979 *start += offset % RT6_INFO_LEN;
1980
1981 arg.len -= offset % RT6_INFO_LEN;
1982
1983 if (arg.len > length)
1984 arg.len = length;
1985 if (arg.len < 0)
1986 arg.len = 0;
1987
1988 return arg.len;
1989}
1990
1da177e4
LT		 1991static int rt6_stats_seq_show(struct seq_file *seq, void *v)
1992{
1993 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
1994 rt6_stats.fib_nodes, rt6_stats.fib_route_nodes,
1995 rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries,
1996 rt6_stats.fib_rt_cache,
1997 atomic_read(&ip6_dst_ops.entries),
1998 rt6_stats.fib_discarded_routes);
1999
2000 return 0;
2001}
2002
2003static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2004{
2005 return single_open(file, rt6_stats_seq_show, NULL);
2006}
2007
2008static struct file_operations rt6_stats_seq_fops = {
2009 .owner = THIS_MODULE,
2010 .open = rt6_stats_seq_open,
2011 .read = seq_read,
2012 .llseek = seq_lseek,
2013 .release = single_release,
2014};
2015#endif /* CONFIG_PROC_FS */
2016
2017#ifdef CONFIG_SYSCTL
2018
2019static int flush_delay;
2020
2021static
2022int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
2023 void __user *buffer, size_t *lenp, loff_t *ppos)
2024{
2025 if (write) {
2026 proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
2027 fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay);
2028 return 0;
2029 } else
2030 return -EINVAL;
2031}
2032
2033ctl_table ipv6_route_table[] = {
2034 {
2035 .ctl_name = NET_IPV6_ROUTE_FLUSH,
2036 .procname = "flush",
2037 .data = &flush_delay,
2038 .maxlen = sizeof(int),
89c8b3a1 2039 .mode = 0200,
1da177e4
LT		 2040 .proc_handler = &ipv6_sysctl_rtcache_flush
2041 },
2042 {
2043 .ctl_name = NET_IPV6_ROUTE_GC_THRESH,
2044 .procname = "gc_thresh",
2045 .data = &ip6_dst_ops.gc_thresh,
2046 .maxlen = sizeof(int),
2047 .mode = 0644,
2048 .proc_handler = &proc_dointvec,
2049 },
2050 {
2051 .ctl_name = NET_IPV6_ROUTE_MAX_SIZE,
2052 .procname = "max_size",
2053 .data = &ip6_rt_max_size,
2054 .maxlen = sizeof(int),
2055 .mode = 0644,
2056 .proc_handler = &proc_dointvec,
2057 },
2058 {
2059 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL,
2060 .procname = "gc_min_interval",
2061 .data = &ip6_rt_gc_min_interval,
2062 .maxlen = sizeof(int),
2063 .mode = 0644,
2064 .proc_handler = &proc_dointvec_jiffies,
2065 .strategy = &sysctl_jiffies,
2066 },
2067 {
2068 .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT,
2069 .procname = "gc_timeout",
2070 .data = &ip6_rt_gc_timeout,
2071 .maxlen = sizeof(int),
2072 .mode = 0644,
2073 .proc_handler = &proc_dointvec_jiffies,
2074 .strategy = &sysctl_jiffies,
2075 },
2076 {
2077 .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL,
2078 .procname = "gc_interval",
2079 .data = &ip6_rt_gc_interval,
2080 .maxlen = sizeof(int),
2081 .mode = 0644,
2082 .proc_handler = &proc_dointvec_jiffies,
2083 .strategy = &sysctl_jiffies,
2084 },
2085 {
2086 .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY,
2087 .procname = "gc_elasticity",
2088 .data = &ip6_rt_gc_elasticity,
2089 .maxlen = sizeof(int),
2090 .mode = 0644,
2091 .proc_handler = &proc_dointvec_jiffies,
2092 .strategy = &sysctl_jiffies,
2093 },
2094 {
2095 .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES,
2096 .procname = "mtu_expires",
2097 .data = &ip6_rt_mtu_expires,
2098 .maxlen = sizeof(int),
2099 .mode = 0644,
2100 .proc_handler = &proc_dointvec_jiffies,
2101 .strategy = &sysctl_jiffies,
2102 },
2103 {
2104 .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS,
2105 .procname = "min_adv_mss",
2106 .data = &ip6_rt_min_advmss,
2107 .maxlen = sizeof(int),
2108 .mode = 0644,
2109 .proc_handler = &proc_dointvec_jiffies,
2110 .strategy = &sysctl_jiffies,
2111 },
2112 {
2113 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
2114 .procname = "gc_min_interval_ms",
2115 .data = &ip6_rt_gc_min_interval,
2116 .maxlen = sizeof(int),
2117 .mode = 0644,
2118 .proc_handler = &proc_dointvec_ms_jiffies,
2119 .strategy = &sysctl_ms_jiffies,
2120 },
2121 { .ctl_name = 0 }
2122};
2123
2124#endif
2125
2126void __init ip6_route_init(void)
2127{
2128 struct proc_dir_entry *p;
2129
2130 ip6_dst_ops.kmem_cachep = kmem_cache_create("ip6_dst_cache",
2131 sizeof(struct rt6_info),
2132 0, SLAB_HWCACHE_ALIGN,
2133 NULL, NULL);
2134 if (!ip6_dst_ops.kmem_cachep)
2135 panic("cannot create ip6_dst_cache");
2136
2137 fib6_init();
2138#ifdef CONFIG_PROC_FS
2139 p = proc_net_create("ipv6_route", 0, rt6_proc_info);
2140 if (p)
2141 p->owner = THIS_MODULE;
2142
2143 proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
2144#endif
2145#ifdef CONFIG_XFRM
2146 xfrm6_init();
2147#endif
2148}
2149
2150void ip6_route_cleanup(void)
2151{
2152#ifdef CONFIG_PROC_FS
2153 proc_net_remove("ipv6_route");
2154 proc_net_remove("rt6_stats");
2155#endif
2156#ifdef CONFIG_XFRM
2157 xfrm6_fini();
2158#endif
2159 rt6_ifdown(NULL);
2160 fib6_gc_cleanup();
2161 kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
2162}
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