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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / route.c
blob183802902c023eb0fed16e3623097edf17211dd4
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
27 #include <linux/config.h>
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>
38 #include <linux/netlink.h>
39 #include <linux/if_arp.h>
40
41 #ifdef CONFIG_PROC_FS
42 #include <linux/proc_fs.h>
43 #include <linux/seq_file.h>
44 #endif
45
46 #include <net/snmp.h>
47 #include <net/ipv6.h>
48 #include <net/ip6_fib.h>
49 #include <net/ip6_route.h>
50 #include <net/ndisc.h>
51 #include <net/addrconf.h>
52 #include <net/tcp.h>
53 #include <linux/rtnetlink.h>
54 #include <net/dst.h>
55 #include <net/xfrm.h>
56
57 #include <asm/uaccess.h>
58
59 #ifdef CONFIG_SYSCTL
60 #include <linux/sysctl.h>
61 #endif
62
63 /* Set to 3 to get tracing. */
64 #define RT6_DEBUG 2
65
66 #if RT6_DEBUG >= 3
67 #define RDBG(x) printk x
68 #define RT6_TRACE(x...) printk(KERN_DEBUG x)
69 #else
70 #define RDBG(x)
71 #define RT6_TRACE(x...) do { ; } while (0)
72 #endif
73
74
75 static int ip6_rt_max_size = 4096;
76 static int ip6_rt_gc_min_interval = HZ / 2;
77 static int ip6_rt_gc_timeout = 60*HZ;
78 int ip6_rt_gc_interval = 30*HZ;
79 static int ip6_rt_gc_elasticity = 9;
80 static int ip6_rt_mtu_expires = 10*60*HZ;
81 static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
82
83 static struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
84 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
85 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
86 static void ip6_dst_destroy(struct dst_entry *);
87 static void ip6_dst_ifdown(struct dst_entry *,
88 struct net_device *dev, int how);
89 static int ip6_dst_gc(void);
90
91 static int ip6_pkt_discard(struct sk_buff *skb);
92 static int ip6_pkt_discard_out(struct sk_buff *skb);
93 static void ip6_link_failure(struct sk_buff *skb);
94 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
95
96 static struct dst_ops ip6_dst_ops = {
97 .family = AF_INET6,
98 .protocol = __constant_htons(ETH_P_IPV6),
99 .gc = ip6_dst_gc,
100 .gc_thresh = 1024,
101 .check = ip6_dst_check,
102 .destroy = ip6_dst_destroy,
103 .ifdown = ip6_dst_ifdown,
104 .negative_advice = ip6_negative_advice,
105 .link_failure = ip6_link_failure,
106 .update_pmtu = ip6_rt_update_pmtu,
107 .entry_size = sizeof(struct rt6_info),
108 };
109
110 struct rt6_info ip6_null_entry = {
111 .u = {
112 .dst = {
113 .__refcnt = ATOMIC_INIT(1),
114 .__use = 1,
115 .dev = &loopback_dev,
116 .obsolete = -1,
117 .error = -ENETUNREACH,
118 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
119 .input = ip6_pkt_discard,
120 .output = ip6_pkt_discard_out,
121 .ops = &ip6_dst_ops,
122 .path = (struct dst_entry*)&ip6_null_entry,
123 }
124 },
125 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
126 .rt6i_metric = ~(u32) 0,
127 .rt6i_ref = ATOMIC_INIT(1),
128 };
129
130 struct fib6_node ip6_routing_table = {
131 .leaf = &ip6_null_entry,
132 .fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO,
133 };
134
135 /* Protects all the ip6 fib */
136
137 DEFINE_RWLOCK(rt6_lock);
138
139
140 /* allocate dst with ip6_dst_ops */
141 static __inline__ struct rt6_info *ip6_dst_alloc(void)
142 {
143 return (struct rt6_info *)dst_alloc(&ip6_dst_ops);
144 }
145
146 static void ip6_dst_destroy(struct dst_entry *dst)
147 {
148 struct rt6_info *rt = (struct rt6_info *)dst;
149 struct inet6_dev *idev = rt->rt6i_idev;
150
151 if (idev != NULL) {
152 rt->rt6i_idev = NULL;
153 in6_dev_put(idev);
154 }
155 }
156
157 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
158 int how)
159 {
160 struct rt6_info *rt = (struct rt6_info *)dst;
161 struct inet6_dev *idev = rt->rt6i_idev;
162
163 if (dev != &loopback_dev && idev != NULL && idev->dev == dev) {
164 struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
165 if (loopback_idev != NULL) {
166 rt->rt6i_idev = loopback_idev;
167 in6_dev_put(idev);
168 }
169 }
170 }
171
172 static __inline__ int rt6_check_expired(const struct rt6_info *rt)
173 {
174 return (rt->rt6i_flags & RTF_EXPIRES &&
175 time_after(jiffies, rt->rt6i_expires));
176 }
177
178 /*
179 * Route lookup. Any rt6_lock is implied.
180 */
181
182 static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt,
183 int oif,
184 int strict)
185 {
186 struct rt6_info *local = NULL;
187 struct rt6_info *sprt;
188
189 if (oif) {
190 for (sprt = rt; sprt; sprt = sprt->u.next) {
191 struct net_device *dev = sprt->rt6i_dev;
192 if (dev->ifindex == oif)
193 return sprt;
194 if (dev->flags & IFF_LOOPBACK) {
195 if (sprt->rt6i_idev == NULL ||
196 sprt->rt6i_idev->dev->ifindex != oif) {
197 if (strict && oif)
198 continue;
199 if (local && (!oif ||
200 local->rt6i_idev->dev->ifindex == oif))
201 continue;
202 }
203 local = sprt;
204 }
205 }
206
207 if (local)
208 return local;
209
210 if (strict)
211 return &ip6_null_entry;
212 }
213 return rt;
214 }
215
216 /*
217 * pointer to the last default router chosen. BH is disabled locally.
218 */
219 static struct rt6_info *rt6_dflt_pointer;
220 static DEFINE_SPINLOCK(rt6_dflt_lock);
221
222 void rt6_reset_dflt_pointer(struct rt6_info *rt)
223 {
224 spin_lock_bh(&rt6_dflt_lock);
225 if (rt == NULL || rt == rt6_dflt_pointer) {
226 RT6_TRACE("reset default router: %p->NULL\n", rt6_dflt_pointer);
227 rt6_dflt_pointer = NULL;
228 }
229 spin_unlock_bh(&rt6_dflt_lock);
230 }
231
232 /* Default Router Selection (RFC 2461 6.3.6) */
233 static struct rt6_info *rt6_best_dflt(struct rt6_info *rt, int oif)
234 {
235 struct rt6_info *match = NULL;
236 struct rt6_info *sprt;
237 int mpri = 0;
238
239 for (sprt = rt; sprt; sprt = sprt->u.next) {
240 struct neighbour *neigh;
241 int m = 0;
242
243 if (!oif ||
244 (sprt->rt6i_dev &&
245 sprt->rt6i_dev->ifindex == oif))
246 m += 8;
247
248 if (rt6_check_expired(sprt))
249 continue;
250
251 if (sprt == rt6_dflt_pointer)
252 m += 4;
253
254 if ((neigh = sprt->rt6i_nexthop) != NULL) {
255 read_lock_bh(&neigh->lock);
256 switch (neigh->nud_state) {
257 case NUD_REACHABLE:
258 m += 3;
259 break;
260
261 case NUD_STALE:
262 case NUD_DELAY:
263 case NUD_PROBE:
264 m += 2;
265 break;
266
267 case NUD_NOARP:
268 case NUD_PERMANENT:
269 m += 1;
270 break;
271
272 case NUD_INCOMPLETE:
273 default:
274 read_unlock_bh(&neigh->lock);
275 continue;
276 }
277 read_unlock_bh(&neigh->lock);
278 } else {
279 continue;
280 }
281
282 if (m > mpri || m >= 12) {
283 match = sprt;
284 mpri = m;
285 if (m >= 12) {
286 /* we choose the last default router if it
287 * is in (probably) reachable state.
288 * If route changed, we should do pmtu
289 * discovery. --yoshfuji
290 */
291 break;
292 }
293 }
294 }
295
296 spin_lock(&rt6_dflt_lock);
297 if (!match) {
298 /*
299 * No default routers are known to be reachable.
300 * SHOULD round robin
301 */
302 if (rt6_dflt_pointer) {
303 for (sprt = rt6_dflt_pointer->u.next;
304 sprt; sprt = sprt->u.next) {
305 if (sprt->u.dst.obsolete <= 0 &&
306 sprt->u.dst.error == 0 &&
307 !rt6_check_expired(sprt)) {
308 match = sprt;
309 break;
310 }
311 }
312 for (sprt = rt;
313 !match && sprt;
314 sprt = sprt->u.next) {
315 if (sprt->u.dst.obsolete <= 0 &&
316 sprt->u.dst.error == 0 &&
317 !rt6_check_expired(sprt)) {
318 match = sprt;
319 break;
320 }
321 if (sprt == rt6_dflt_pointer)
322 break;
323 }
324 }
325 }
326
327 if (match) {
328 if (rt6_dflt_pointer != match)
329 RT6_TRACE("changed default router: %p->%p\n",
330 rt6_dflt_pointer, match);
331 rt6_dflt_pointer = match;
332 }
333 spin_unlock(&rt6_dflt_lock);
334
335 if (!match) {
336 /*
337 * Last Resort: if no default routers found,
338 * use addrconf default route.
339 * We don't record this route.
340 */
341 for (sprt = ip6_routing_table.leaf;
342 sprt; sprt = sprt->u.next) {
343 if (!rt6_check_expired(sprt) &&
344 (sprt->rt6i_flags & RTF_DEFAULT) &&
345 (!oif ||
346 (sprt->rt6i_dev &&
347 sprt->rt6i_dev->ifindex == oif))) {
348 match = sprt;
349 break;
350 }
351 }
352 if (!match) {
353 /* no default route. give up. */
354 match = &ip6_null_entry;
355 }
356 }
357
358 return match;
359 }
360
361 struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
362 int oif, int strict)
363 {
364 struct fib6_node *fn;
365 struct rt6_info *rt;
366
367 read_lock_bh(&rt6_lock);
368 fn = fib6_lookup(&ip6_routing_table, daddr, saddr);
369 rt = rt6_device_match(fn->leaf, oif, strict);
370 dst_hold(&rt->u.dst);
371 rt->u.dst.__use++;
372 read_unlock_bh(&rt6_lock);
373
374 rt->u.dst.lastuse = jiffies;
375 if (rt->u.dst.error == 0)
376 return rt;
377 dst_release(&rt->u.dst);
378 return NULL;
379 }
380
381 /* ip6_ins_rt is called with FREE rt6_lock.
382 It takes new route entry, the addition fails by any reason the
383 route is freed. In any case, if caller does not hold it, it may
384 be destroyed.
385 */
386
387 int ip6_ins_rt(struct rt6_info *rt, struct nlmsghdr *nlh, void *_rtattr)
388 {
389 int err;
390
391 write_lock_bh(&rt6_lock);
392 err = fib6_add(&ip6_routing_table, rt, nlh, _rtattr);
393 write_unlock_bh(&rt6_lock);
394
395 return err;
396 }
397
398 /* No rt6_lock! If COW failed, the function returns dead route entry
399 with dst->error set to errno value.
400 */
401
402 static struct rt6_info *rt6_cow(struct rt6_info *ort, struct in6_addr *daddr,
403 struct in6_addr *saddr)
404 {
405 int err;
406 struct rt6_info *rt;
407
408 /*
409 * Clone the route.
410 */
411
412 rt = ip6_rt_copy(ort);
413
414 if (rt) {
415 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
416
417 if (!(rt->rt6i_flags&RTF_GATEWAY))
418 ipv6_addr_copy(&rt->rt6i_gateway, daddr);
419
420 rt->rt6i_dst.plen = 128;
421 rt->rt6i_flags |= RTF_CACHE;
422 rt->u.dst.flags |= DST_HOST;
423
424 #ifdef CONFIG_IPV6_SUBTREES
425 if (rt->rt6i_src.plen && saddr) {
426 ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
427 rt->rt6i_src.plen = 128;
428 }
429 #endif
430
431 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
432
433 dst_hold(&rt->u.dst);
434
435 err = ip6_ins_rt(rt, NULL, NULL);
436 if (err == 0)
437 return rt;
438
439 rt->u.dst.error = err;
440
441 return rt;
442 }
443 dst_hold(&ip6_null_entry.u.dst);
444 return &ip6_null_entry;
445 }
446
447 #define BACKTRACK() \
448 if (rt == &ip6_null_entry && strict) { \
449 while ((fn = fn->parent) != NULL) { \
450 if (fn->fn_flags & RTN_ROOT) { \
451 dst_hold(&rt->u.dst); \
452 goto out; \
453 } \
454 if (fn->fn_flags & RTN_RTINFO) \
455 goto restart; \
456 } \
457 }
458
459
460 void ip6_route_input(struct sk_buff *skb)
461 {
462 struct fib6_node *fn;
463 struct rt6_info *rt;
464 int strict;
465 int attempts = 3;
466
467 strict = ipv6_addr_type(&skb->nh.ipv6h->daddr) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL);
468
469 relookup:
470 read_lock_bh(&rt6_lock);
471
472 fn = fib6_lookup(&ip6_routing_table, &skb->nh.ipv6h->daddr,
473 &skb->nh.ipv6h->saddr);
474
475 restart:
476 rt = fn->leaf;
477
478 if ((rt->rt6i_flags & RTF_CACHE)) {
479 rt = rt6_device_match(rt, skb->dev->ifindex, strict);
480 BACKTRACK();
481 dst_hold(&rt->u.dst);
482 goto out;
483 }
484
485 rt = rt6_device_match(rt, skb->dev->ifindex, 0);
486 BACKTRACK();
487
488 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
489 struct rt6_info *nrt;
490 dst_hold(&rt->u.dst);
491 read_unlock_bh(&rt6_lock);
492
493 nrt = rt6_cow(rt, &skb->nh.ipv6h->daddr,
494 &skb->nh.ipv6h->saddr);
495
496 dst_release(&rt->u.dst);
497 rt = nrt;
498
499 if (rt->u.dst.error != -EEXIST || --attempts <= 0)
500 goto out2;
501
502 /* Race condition! In the gap, when rt6_lock was
503 released someone could insert this route. Relookup.
504 */
505 dst_release(&rt->u.dst);
506 goto relookup;
507 }
508 dst_hold(&rt->u.dst);
509
510 out:
511 read_unlock_bh(&rt6_lock);
512 out2:
513 rt->u.dst.lastuse = jiffies;
514 rt->u.dst.__use++;
515 skb->dst = (struct dst_entry *) rt;
516 }
517
518 struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
519 {
520 struct fib6_node *fn;
521 struct rt6_info *rt;
522 int strict;
523 int attempts = 3;
524
525 strict = ipv6_addr_type(&fl->fl6_dst) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL);
526
527 relookup:
528 read_lock_bh(&rt6_lock);
529
530 fn = fib6_lookup(&ip6_routing_table, &fl->fl6_dst, &fl->fl6_src);
531
532 restart:
533 rt = fn->leaf;
534
535 if ((rt->rt6i_flags & RTF_CACHE)) {
536 rt = rt6_device_match(rt, fl->oif, strict);
537 BACKTRACK();
538 dst_hold(&rt->u.dst);
539 goto out;
540 }
541 if (rt->rt6i_flags & RTF_DEFAULT) {
542 if (rt->rt6i_metric >= IP6_RT_PRIO_ADDRCONF)
543 rt = rt6_best_dflt(rt, fl->oif);
544 } else {
545 rt = rt6_device_match(rt, fl->oif, strict);
546 BACKTRACK();
547 }
548
549 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
550 struct rt6_info *nrt;
551 dst_hold(&rt->u.dst);
552 read_unlock_bh(&rt6_lock);
553
554 nrt = rt6_cow(rt, &fl->fl6_dst, &fl->fl6_src);
555
556 dst_release(&rt->u.dst);
557 rt = nrt;
558
559 if (rt->u.dst.error != -EEXIST || --attempts <= 0)
560 goto out2;
561
562 /* Race condition! In the gap, when rt6_lock was
563 released someone could insert this route. Relookup.
564 */
565 dst_release(&rt->u.dst);
566 goto relookup;
567 }
568 dst_hold(&rt->u.dst);
569
570 out:
571 read_unlock_bh(&rt6_lock);
572 out2:
573 rt->u.dst.lastuse = jiffies;
574 rt->u.dst.__use++;
575 return &rt->u.dst;
576 }
577
578
579 /*
580 * Destination cache support functions
581 */
582
583 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
584 {
585 struct rt6_info *rt;
586
587 rt = (struct rt6_info *) dst;
588
589 if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
590 return dst;
591
592 return NULL;
593 }
594
595 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
596 {
597 struct rt6_info *rt = (struct rt6_info *) dst;
598
599 if (rt) {
600 if (rt->rt6i_flags & RTF_CACHE)
601 ip6_del_rt(rt, NULL, NULL);
602 else
603 dst_release(dst);
604 }
605 return NULL;
606 }
607
608 static void ip6_link_failure(struct sk_buff *skb)
609 {
610 struct rt6_info *rt;
611
612 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
613
614 rt = (struct rt6_info *) skb->dst;
615 if (rt) {
616 if (rt->rt6i_flags&RTF_CACHE) {
617 dst_set_expires(&rt->u.dst, 0);
618 rt->rt6i_flags |= RTF_EXPIRES;
619 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
620 rt->rt6i_node->fn_sernum = -1;
621 }
622 }
623
624 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
625 {
626 struct rt6_info *rt6 = (struct rt6_info*)dst;
627
628 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
629 rt6->rt6i_flags |= RTF_MODIFIED;
630 if (mtu < IPV6_MIN_MTU) {
631 mtu = IPV6_MIN_MTU;
632 dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
633 }
634 dst->metrics[RTAX_MTU-1] = mtu;
635 }
636 }
637
638 /* Protected by rt6_lock. */
639 static struct dst_entry *ndisc_dst_gc_list;
640 static int ipv6_get_mtu(struct net_device *dev);
641
642 static inline unsigned int ipv6_advmss(unsigned int mtu)
643 {
644 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
645
646 if (mtu < ip6_rt_min_advmss)
647 mtu = ip6_rt_min_advmss;
648
649 /*
650 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
651 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
652 * IPV6_MAXPLEN is also valid and means: "any MSS,
653 * rely only on pmtu discovery"
654 */
655 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
656 mtu = IPV6_MAXPLEN;
657 return mtu;
658 }
659
660 struct dst_entry *ndisc_dst_alloc(struct net_device *dev,
661 struct neighbour *neigh,
662 struct in6_addr *addr,
663 int (*output)(struct sk_buff *))
664 {
665 struct rt6_info *rt;
666 struct inet6_dev *idev = in6_dev_get(dev);
667
668 if (unlikely(idev == NULL))
669 return NULL;
670
671 rt = ip6_dst_alloc();
672 if (unlikely(rt == NULL)) {
673 in6_dev_put(idev);
674 goto out;
675 }
676
677 dev_hold(dev);
678 if (neigh)
679 neigh_hold(neigh);
680 else
681 neigh = ndisc_get_neigh(dev, addr);
682
683 rt->rt6i_dev = dev;
684 rt->rt6i_idev = idev;
685 rt->rt6i_nexthop = neigh;
686 atomic_set(&rt->u.dst.__refcnt, 1);
687 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
688 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
689 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
690 rt->u.dst.output = output;
691
692 #if 0 /* there's no chance to use these for ndisc */
693 rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
694 ? DST_HOST
695 : 0;
696 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
697 rt->rt6i_dst.plen = 128;
698 #endif
699
700 write_lock_bh(&rt6_lock);
701 rt->u.dst.next = ndisc_dst_gc_list;
702 ndisc_dst_gc_list = &rt->u.dst;
703 write_unlock_bh(&rt6_lock);
704
705 fib6_force_start_gc();
706
707 out:
708 return (struct dst_entry *)rt;
709 }
710
711 int ndisc_dst_gc(int *more)
712 {
713 struct dst_entry *dst, *next, **pprev;
714 int freed;
715
716 next = NULL;
717 pprev = &ndisc_dst_gc_list;
718 freed = 0;
719 while ((dst = *pprev) != NULL) {
720 if (!atomic_read(&dst->__refcnt)) {
721 *pprev = dst->next;
722 dst_free(dst);
723 freed++;
724 } else {
725 pprev = &dst->next;
726 (*more)++;
727 }
728 }
729
730 return freed;
731 }
732
733 static int ip6_dst_gc(void)
734 {
735 static unsigned expire = 30*HZ;
736 static unsigned long last_gc;
737 unsigned long now = jiffies;
738
739 if (time_after(last_gc + ip6_rt_gc_min_interval, now) &&
740 atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size)
741 goto out;
742
743 expire++;
744 fib6_run_gc(expire);
745 last_gc = now;
746 if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh)
747 expire = ip6_rt_gc_timeout>>1;
748
749 out:
750 expire -= expire>>ip6_rt_gc_elasticity;
751 return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size);
752 }
753
754 /* Clean host part of a prefix. Not necessary in radix tree,
755 but results in cleaner routing tables.
756
757 Remove it only when all the things will work!
758 */
759
760 static int ipv6_get_mtu(struct net_device *dev)
761 {
762 int mtu = IPV6_MIN_MTU;
763 struct inet6_dev *idev;
764
765 idev = in6_dev_get(dev);
766 if (idev) {
767 mtu = idev->cnf.mtu6;
768 in6_dev_put(idev);
769 }
770 return mtu;
771 }
772
773 int ipv6_get_hoplimit(struct net_device *dev)
774 {
775 int hoplimit = ipv6_devconf.hop_limit;
776 struct inet6_dev *idev;
777
778 idev = in6_dev_get(dev);
779 if (idev) {
780 hoplimit = idev->cnf.hop_limit;
781 in6_dev_put(idev);
782 }
783 return hoplimit;
784 }
785
786 /*
787 *
788 */
789
790 int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, void *_rtattr)
791 {
792 int err;
793 struct rtmsg *r;
794 struct rtattr **rta;
795 struct rt6_info *rt = NULL;
796 struct net_device *dev = NULL;
797 struct inet6_dev *idev = NULL;
798 int addr_type;
799
800 rta = (struct rtattr **) _rtattr;
801
802 if (rtmsg->rtmsg_dst_len > 128 || rtmsg->rtmsg_src_len > 128)
803 return -EINVAL;
804 #ifndef CONFIG_IPV6_SUBTREES
805 if (rtmsg->rtmsg_src_len)
806 return -EINVAL;
807 #endif
808 if (rtmsg->rtmsg_ifindex) {
809 err = -ENODEV;
810 dev = dev_get_by_index(rtmsg->rtmsg_ifindex);
811 if (!dev)
812 goto out;
813 idev = in6_dev_get(dev);
814 if (!idev)
815 goto out;
816 }
817
818 if (rtmsg->rtmsg_metric == 0)
819 rtmsg->rtmsg_metric = IP6_RT_PRIO_USER;
820
821 rt = ip6_dst_alloc();
822
823 if (rt == NULL) {
824 err = -ENOMEM;
825 goto out;
826 }
827
828 rt->u.dst.obsolete = -1;
829 rt->rt6i_expires = clock_t_to_jiffies(rtmsg->rtmsg_info);
830 if (nlh && (r = NLMSG_DATA(nlh))) {
831 rt->rt6i_protocol = r->rtm_protocol;
832 } else {
833 rt->rt6i_protocol = RTPROT_BOOT;
834 }
835
836 addr_type = ipv6_addr_type(&rtmsg->rtmsg_dst);
837
838 if (addr_type & IPV6_ADDR_MULTICAST)
839 rt->u.dst.input = ip6_mc_input;
840 else
841 rt->u.dst.input = ip6_forward;
842
843 rt->u.dst.output = ip6_output;
844
845 ipv6_addr_prefix(&rt->rt6i_dst.addr,
846 &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len);
847 rt->rt6i_dst.plen = rtmsg->rtmsg_dst_len;
848 if (rt->rt6i_dst.plen == 128)
849 rt->u.dst.flags = DST_HOST;
850
851 #ifdef CONFIG_IPV6_SUBTREES
852 ipv6_addr_prefix(&rt->rt6i_src.addr,
853 &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len);
854 rt->rt6i_src.plen = rtmsg->rtmsg_src_len;
855 #endif
856
857 rt->rt6i_metric = rtmsg->rtmsg_metric;
858
859 /* We cannot add true routes via loopback here,
860 they would result in kernel looping; promote them to reject routes
861 */
862 if ((rtmsg->rtmsg_flags&RTF_REJECT) ||
863 (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
864 /* hold loopback dev/idev if we haven't done so. */
865 if (dev != &loopback_dev) {
866 if (dev) {
867 dev_put(dev);
868 in6_dev_put(idev);
869 }
870 dev = &loopback_dev;
871 dev_hold(dev);
872 idev = in6_dev_get(dev);
873 if (!idev) {
874 err = -ENODEV;
875 goto out;
876 }
877 }
878 rt->u.dst.output = ip6_pkt_discard_out;
879 rt->u.dst.input = ip6_pkt_discard;
880 rt->u.dst.error = -ENETUNREACH;
881 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
882 goto install_route;
883 }
884
885 if (rtmsg->rtmsg_flags & RTF_GATEWAY) {
886 struct in6_addr *gw_addr;
887 int gwa_type;
888
889 gw_addr = &rtmsg->rtmsg_gateway;
890 ipv6_addr_copy(&rt->rt6i_gateway, &rtmsg->rtmsg_gateway);
891 gwa_type = ipv6_addr_type(gw_addr);
892
893 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
894 struct rt6_info *grt;
895
896 /* IPv6 strictly inhibits using not link-local
897 addresses as nexthop address.
898 Otherwise, router will not able to send redirects.
899 It is very good, but in some (rare!) circumstances
900 (SIT, PtP, NBMA NOARP links) it is handy to allow
901 some exceptions. --ANK
902 */
903 err = -EINVAL;
904 if (!(gwa_type&IPV6_ADDR_UNICAST))
905 goto out;
906
907 grt = rt6_lookup(gw_addr, NULL, rtmsg->rtmsg_ifindex, 1);
908
909 err = -EHOSTUNREACH;
910 if (grt == NULL)
911 goto out;
912 if (dev) {
913 if (dev != grt->rt6i_dev) {
914 dst_release(&grt->u.dst);
915 goto out;
916 }
917 } else {
918 dev = grt->rt6i_dev;
919 idev = grt->rt6i_idev;
920 dev_hold(dev);
921 in6_dev_hold(grt->rt6i_idev);
922 }
923 if (!(grt->rt6i_flags&RTF_GATEWAY))
924 err = 0;
925 dst_release(&grt->u.dst);
926
927 if (err)
928 goto out;
929 }
930 err = -EINVAL;
931 if (dev == NULL || (dev->flags&IFF_LOOPBACK))
932 goto out;
933 }
934
935 err = -ENODEV;
936 if (dev == NULL)
937 goto out;
938
939 if (rtmsg->rtmsg_flags & (RTF_GATEWAY|RTF_NONEXTHOP)) {
940 rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
941 if (IS_ERR(rt->rt6i_nexthop)) {
942 err = PTR_ERR(rt->rt6i_nexthop);
943 rt->rt6i_nexthop = NULL;
944 goto out;
945 }
946 }
947
948 rt->rt6i_flags = rtmsg->rtmsg_flags;
949
950 install_route:
951 if (rta && rta[RTA_METRICS-1]) {
952 int attrlen = RTA_PAYLOAD(rta[RTA_METRICS-1]);
953 struct rtattr *attr = RTA_DATA(rta[RTA_METRICS-1]);
954
955 while (RTA_OK(attr, attrlen)) {
956 unsigned flavor = attr->rta_type;
957 if (flavor) {
958 if (flavor > RTAX_MAX) {
959 err = -EINVAL;
960 goto out;
961 }
962 rt->u.dst.metrics[flavor-1] =
963 *(u32 *)RTA_DATA(attr);
964 }
965 attr = RTA_NEXT(attr, attrlen);
966 }
967 }
968
969 if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
970 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
971 if (!rt->u.dst.metrics[RTAX_MTU-1])
972 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
973 if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
974 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
975 rt->u.dst.dev = dev;
976 rt->rt6i_idev = idev;
977 return ip6_ins_rt(rt, nlh, _rtattr);
978
979 out:
980 if (dev)
981 dev_put(dev);
982 if (idev)
983 in6_dev_put(idev);
984 if (rt)
985 dst_free((struct dst_entry *) rt);
986 return err;
987 }
988
989 int ip6_del_rt(struct rt6_info *rt, struct nlmsghdr *nlh, void *_rtattr)
990 {
991 int err;
992
993 write_lock_bh(&rt6_lock);
994
995 rt6_reset_dflt_pointer(NULL);
996
997 err = fib6_del(rt, nlh, _rtattr);
998 dst_release(&rt->u.dst);
999
1000 write_unlock_bh(&rt6_lock);
1001
1002 return err;
1003 }
1004
1005 static int ip6_route_del(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, void *_rtattr)
1006 {
1007 struct fib6_node *fn;
1008 struct rt6_info *rt;
1009 int err = -ESRCH;
1010
1011 read_lock_bh(&rt6_lock);
1012
1013 fn = fib6_locate(&ip6_routing_table,
1014 &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len,
1015 &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len);
1016
1017 if (fn) {
1018 for (rt = fn->leaf; rt; rt = rt->u.next) {
1019 if (rtmsg->rtmsg_ifindex &&
1020 (rt->rt6i_dev == NULL ||
1021 rt->rt6i_dev->ifindex != rtmsg->rtmsg_ifindex))
1022 continue;
1023 if (rtmsg->rtmsg_flags&RTF_GATEWAY &&
1024 !ipv6_addr_equal(&rtmsg->rtmsg_gateway, &rt->rt6i_gateway))
1025 continue;
1026 if (rtmsg->rtmsg_metric &&
1027 rtmsg->rtmsg_metric != rt->rt6i_metric)
1028 continue;
1029 dst_hold(&rt->u.dst);
1030 read_unlock_bh(&rt6_lock);
1031
1032 return ip6_del_rt(rt, nlh, _rtattr);
1033 }
1034 }
1035 read_unlock_bh(&rt6_lock);
1036
1037 return err;
1038 }
1039
1040 /*
1041 * Handle redirects
1042 */
1043 void rt6_redirect(struct in6_addr *dest, struct in6_addr *saddr,
1044 struct neighbour *neigh, u8 *lladdr, int on_link)
1045 {
1046 struct rt6_info *rt, *nrt;
1047
1048 /* Locate old route to this destination. */
1049 rt = rt6_lookup(dest, NULL, neigh->dev->ifindex, 1);
1050
1051 if (rt == NULL)
1052 return;
1053
1054 if (neigh->dev != rt->rt6i_dev)
1055 goto out;
1056
1057 /*
1058 * Current route is on-link; redirect is always invalid.
1059 *
1060 * Seems, previous statement is not true. It could
1061 * be node, which looks for us as on-link (f.e. proxy ndisc)
1062 * But then router serving it might decide, that we should
1063 * know truth 8)8) --ANK (980726).
1064 */
1065 if (!(rt->rt6i_flags&RTF_GATEWAY))
1066 goto out;
1067
1068 /*
1069 * RFC 2461 specifies that redirects should only be
1070 * accepted if they come from the nexthop to the target.
1071 * Due to the way default routers are chosen, this notion
1072 * is a bit fuzzy and one might need to check all default
1073 * routers.
1074 */
1075 if (!ipv6_addr_equal(saddr, &rt->rt6i_gateway)) {
1076 if (rt->rt6i_flags & RTF_DEFAULT) {
1077 struct rt6_info *rt1;
1078
1079 read_lock(&rt6_lock);
1080 for (rt1 = ip6_routing_table.leaf; rt1; rt1 = rt1->u.next) {
1081 if (ipv6_addr_equal(saddr, &rt1->rt6i_gateway)) {
1082 dst_hold(&rt1->u.dst);
1083 dst_release(&rt->u.dst);
1084 read_unlock(&rt6_lock);
1085 rt = rt1;
1086 goto source_ok;
1087 }
1088 }
1089 read_unlock(&rt6_lock);
1090 }
1091 if (net_ratelimit())
1092 printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
1093 "for redirect target\n");
1094 goto out;
1095 }
1096
1097 source_ok:
1098
1099 /*
1100 * We have finally decided to accept it.
1101 */
1102
1103 neigh_update(neigh, lladdr, NUD_STALE,
1104 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1105 NEIGH_UPDATE_F_OVERRIDE|
1106 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1107 NEIGH_UPDATE_F_ISROUTER))
1108 );
1109
1110 /*
1111 * Redirect received -> path was valid.
1112 * Look, redirects are sent only in response to data packets,
1113 * so that this nexthop apparently is reachable. --ANK
1114 */
1115 dst_confirm(&rt->u.dst);
1116
1117 /* Duplicate redirect: silently ignore. */
1118 if (neigh == rt->u.dst.neighbour)
1119 goto out;
1120
1121 nrt = ip6_rt_copy(rt);
1122 if (nrt == NULL)
1123 goto out;
1124
1125 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1126 if (on_link)
1127 nrt->rt6i_flags &= ~RTF_GATEWAY;
1128
1129 ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
1130 nrt->rt6i_dst.plen = 128;
1131 nrt->u.dst.flags |= DST_HOST;
1132
1133 ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
1134 nrt->rt6i_nexthop = neigh_clone(neigh);
1135 /* Reset pmtu, it may be better */
1136 nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
1137 nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst));
1138
1139 if (ip6_ins_rt(nrt, NULL, NULL))
1140 goto out;
1141
1142 if (rt->rt6i_flags&RTF_CACHE) {
1143 ip6_del_rt(rt, NULL, NULL);
1144 return;
1145 }
1146
1147 out:
1148 dst_release(&rt->u.dst);
1149 return;
1150 }
1151
1152 /*
1153 * Handle ICMP "packet too big" messages
1154 * i.e. Path MTU discovery
1155 */
1156
1157 void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
1158 struct net_device *dev, u32 pmtu)
1159 {
1160 struct rt6_info *rt, *nrt;
1161 int allfrag = 0;
1162
1163 rt = rt6_lookup(daddr, saddr, dev->ifindex, 0);
1164 if (rt == NULL)
1165 return;
1166
1167 if (pmtu >= dst_mtu(&rt->u.dst))
1168 goto out;
1169
1170 if (pmtu < IPV6_MIN_MTU) {
1171 /*
1172 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
1173 * MTU (1280) and a fragment header should always be included
1174 * after a node receiving Too Big message reporting PMTU is
1175 * less than the IPv6 Minimum Link MTU.
1176 */
1177 pmtu = IPV6_MIN_MTU;
1178 allfrag = 1;
1179 }
1180
1181 /* New mtu received -> path was valid.
1182 They are sent only in response to data packets,
1183 so that this nexthop apparently is reachable. --ANK
1184 */
1185 dst_confirm(&rt->u.dst);
1186
1187 /* Host route. If it is static, it would be better
1188 not to override it, but add new one, so that
1189 when cache entry will expire old pmtu
1190 would return automatically.
1191 */
1192 if (rt->rt6i_flags & RTF_CACHE) {
1193 rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1194 if (allfrag)
1195 rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1196 dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires);
1197 rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
1198 goto out;
1199 }
1200
1201 /* Network route.
1202 Two cases are possible:
1203 1. It is connected route. Action: COW
1204 2. It is gatewayed route or NONEXTHOP route. Action: clone it.
1205 */
1206 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
1207 nrt = rt6_cow(rt, daddr, saddr);
1208 if (!nrt->u.dst.error) {
1209 nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1210 if (allfrag)
1211 nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1212 /* According to RFC 1981, detecting PMTU increase shouldn't be
1213 happened within 5 mins, the recommended timer is 10 mins.
1214 Here this route expiration time is set to ip6_rt_mtu_expires
1215 which is 10 mins. After 10 mins the decreased pmtu is expired
1216 and detecting PMTU increase will be automatically happened.
1217 */
1218 dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
1219 nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
1220 }
1221 dst_release(&nrt->u.dst);
1222 } else {
1223 nrt = ip6_rt_copy(rt);
1224 if (nrt == NULL)
1225 goto out;
1226 ipv6_addr_copy(&nrt->rt6i_dst.addr, daddr);
1227 nrt->rt6i_dst.plen = 128;
1228 nrt->u.dst.flags |= DST_HOST;
1229 nrt->rt6i_nexthop = neigh_clone(rt->rt6i_nexthop);
1230 dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
1231 nrt->rt6i_flags |= RTF_DYNAMIC|RTF_CACHE|RTF_EXPIRES;
1232 nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1233 if (allfrag)
1234 nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1235 ip6_ins_rt(nrt, NULL, NULL);
1236 }
1237
1238 out:
1239 dst_release(&rt->u.dst);
1240 }
1241
1242 /*
1243 * Misc support functions
1244 */
1245
1246 static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
1247 {
1248 struct rt6_info *rt = ip6_dst_alloc();
1249
1250 if (rt) {
1251 rt->u.dst.input = ort->u.dst.input;
1252 rt->u.dst.output = ort->u.dst.output;
1253
1254 memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
1255 rt->u.dst.dev = ort->u.dst.dev;
1256 if (rt->u.dst.dev)
1257 dev_hold(rt->u.dst.dev);
1258 rt->rt6i_idev = ort->rt6i_idev;
1259 if (rt->rt6i_idev)
1260 in6_dev_hold(rt->rt6i_idev);
1261 rt->u.dst.lastuse = jiffies;
1262 rt->rt6i_expires = 0;
1263
1264 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
1265 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
1266 rt->rt6i_metric = 0;
1267
1268 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1269 #ifdef CONFIG_IPV6_SUBTREES
1270 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1271 #endif
1272 }
1273 return rt;
1274 }
1275
1276 struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
1277 {
1278 struct rt6_info *rt;
1279 struct fib6_node *fn;
1280
1281 fn = &ip6_routing_table;
1282
1283 write_lock_bh(&rt6_lock);
1284 for (rt = fn->leaf; rt; rt=rt->u.next) {
1285 if (dev == rt->rt6i_dev &&
1286 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1287 break;
1288 }
1289 if (rt)
1290 dst_hold(&rt->u.dst);
1291 write_unlock_bh(&rt6_lock);
1292 return rt;
1293 }
1294
1295 struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1296 struct net_device *dev)
1297 {
1298 struct in6_rtmsg rtmsg;
1299
1300 memset(&rtmsg, 0, sizeof(struct in6_rtmsg));
1301 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1302 ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr);
1303 rtmsg.rtmsg_metric = 1024;
1304 rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | RTF_UP | RTF_EXPIRES;
1305
1306 rtmsg.rtmsg_ifindex = dev->ifindex;
1307
1308 ip6_route_add(&rtmsg, NULL, NULL);
1309 return rt6_get_dflt_router(gwaddr, dev);
1310 }
1311
1312 void rt6_purge_dflt_routers(void)
1313 {
1314 struct rt6_info *rt;
1315
1316 restart:
1317 read_lock_bh(&rt6_lock);
1318 for (rt = ip6_routing_table.leaf; rt; rt = rt->u.next) {
1319 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
1320 dst_hold(&rt->u.dst);
1321
1322 rt6_reset_dflt_pointer(NULL);
1323
1324 read_unlock_bh(&rt6_lock);
1325
1326 ip6_del_rt(rt, NULL, NULL);
1327
1328 goto restart;
1329 }
1330 }
1331 read_unlock_bh(&rt6_lock);
1332 }
1333
1334 int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
1335 {
1336 struct in6_rtmsg rtmsg;
1337 int err;
1338
1339 switch(cmd) {
1340 case SIOCADDRT: /* Add a route */
1341 case SIOCDELRT: /* Delete a route */
1342 if (!capable(CAP_NET_ADMIN))
1343 return -EPERM;
1344 err = copy_from_user(&rtmsg, arg,
1345 sizeof(struct in6_rtmsg));
1346 if (err)
1347 return -EFAULT;
1348
1349 rtnl_lock();
1350 switch (cmd) {
1351 case SIOCADDRT:
1352 err = ip6_route_add(&rtmsg, NULL, NULL);
1353 break;
1354 case SIOCDELRT:
1355 err = ip6_route_del(&rtmsg, NULL, NULL);
1356 break;
1357 default:
1358 err = -EINVAL;
1359 }
1360 rtnl_unlock();
1361
1362 return err;
1363 };
1364
1365 return -EINVAL;
1366 }
1367
1368 /*
1369 * Drop the packet on the floor
1370 */
1371
1372 int ip6_pkt_discard(struct sk_buff *skb)
1373 {
1374 IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
1375 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev);
1376 kfree_skb(skb);
1377 return 0;
1378 }
1379
1380 int ip6_pkt_discard_out(struct sk_buff *skb)
1381 {
1382 skb->dev = skb->dst->dev;
1383 return ip6_pkt_discard(skb);
1384 }
1385
1386 /*
1387 * Allocate a dst for local (unicast / anycast) address.
1388 */
1389
1390 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
1391 const struct in6_addr *addr,
1392 int anycast)
1393 {
1394 struct rt6_info *rt = ip6_dst_alloc();
1395
1396 if (rt == NULL)
1397 return ERR_PTR(-ENOMEM);
1398
1399 dev_hold(&loopback_dev);
1400 in6_dev_hold(idev);
1401
1402 rt->u.dst.flags = DST_HOST;
1403 rt->u.dst.input = ip6_input;
1404 rt->u.dst.output = ip6_output;
1405 rt->rt6i_dev = &loopback_dev;
1406 rt->rt6i_idev = idev;
1407 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
1408 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
1409 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1410 rt->u.dst.obsolete = -1;
1411
1412 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
1413 if (!anycast)
1414 rt->rt6i_flags |= RTF_LOCAL;
1415 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
1416 if (rt->rt6i_nexthop == NULL) {
1417 dst_free((struct dst_entry *) rt);
1418 return ERR_PTR(-ENOMEM);
1419 }
1420
1421 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
1422 rt->rt6i_dst.plen = 128;
1423
1424 atomic_set(&rt->u.dst.__refcnt, 1);
1425
1426 return rt;
1427 }
1428
1429 static int fib6_ifdown(struct rt6_info *rt, void *arg)
1430 {
1431 if (((void*)rt->rt6i_dev == arg || arg == NULL) &&
1432 rt != &ip6_null_entry) {
1433 RT6_TRACE("deleted by ifdown %p\n", rt);
1434 return -1;
1435 }
1436 return 0;
1437 }
1438
1439 void rt6_ifdown(struct net_device *dev)
1440 {
1441 write_lock_bh(&rt6_lock);
1442 fib6_clean_tree(&ip6_routing_table, fib6_ifdown, 0, dev);
1443 write_unlock_bh(&rt6_lock);
1444 }
1445
1446 struct rt6_mtu_change_arg
1447 {
1448 struct net_device *dev;
1449 unsigned mtu;
1450 };
1451
1452 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
1453 {
1454 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
1455 struct inet6_dev *idev;
1456
1457 /* In IPv6 pmtu discovery is not optional,
1458 so that RTAX_MTU lock cannot disable it.
1459 We still use this lock to block changes
1460 caused by addrconf/ndisc.
1461 */
1462
1463 idev = __in6_dev_get(arg->dev);
1464 if (idev == NULL)
1465 return 0;
1466
1467 /* For administrative MTU increase, there is no way to discover
1468 IPv6 PMTU increase, so PMTU increase should be updated here.
1469 Since RFC 1981 doesn't include administrative MTU increase
1470 update PMTU increase is a MUST. (i.e. jumbo frame)
1471 */
1472 /*
1473 If new MTU is less than route PMTU, this new MTU will be the
1474 lowest MTU in the path, update the route PMTU to reflect PMTU
1475 decreases; if new MTU is greater than route PMTU, and the
1476 old MTU is the lowest MTU in the path, update the route PMTU
1477 to reflect the increase. In this case if the other nodes' MTU
1478 also have the lowest MTU, TOO BIG MESSAGE will be lead to
1479 PMTU discouvery.
1480 */
1481 if (rt->rt6i_dev == arg->dev &&
1482 !dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
1483 (dst_mtu(&rt->u.dst) > arg->mtu ||
1484 (dst_mtu(&rt->u.dst) < arg->mtu &&
1485 dst_mtu(&rt->u.dst) == idev->cnf.mtu6)))
1486 rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
1487 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
1488 return 0;
1489 }
1490
1491 void rt6_mtu_change(struct net_device *dev, unsigned mtu)
1492 {
1493 struct rt6_mtu_change_arg arg;
1494
1495 arg.dev = dev;
1496 arg.mtu = mtu;
1497 read_lock_bh(&rt6_lock);
1498 fib6_clean_tree(&ip6_routing_table, rt6_mtu_change_route, 0, &arg);
1499 read_unlock_bh(&rt6_lock);
1500 }
1501
1502 static int inet6_rtm_to_rtmsg(struct rtmsg *r, struct rtattr **rta,
1503 struct in6_rtmsg *rtmsg)
1504 {
1505 memset(rtmsg, 0, sizeof(*rtmsg));
1506
1507 rtmsg->rtmsg_dst_len = r->rtm_dst_len;
1508 rtmsg->rtmsg_src_len = r->rtm_src_len;
1509 rtmsg->rtmsg_flags = RTF_UP;
1510 if (r->rtm_type == RTN_UNREACHABLE)
1511 rtmsg->rtmsg_flags |= RTF_REJECT;
1512
1513 if (rta[RTA_GATEWAY-1]) {
1514 if (rta[RTA_GATEWAY-1]->rta_len != RTA_LENGTH(16))
1515 return -EINVAL;
1516 memcpy(&rtmsg->rtmsg_gateway, RTA_DATA(rta[RTA_GATEWAY-1]), 16);
1517 rtmsg->rtmsg_flags |= RTF_GATEWAY;
1518 }
1519 if (rta[RTA_DST-1]) {
1520 if (RTA_PAYLOAD(rta[RTA_DST-1]) < ((r->rtm_dst_len+7)>>3))
1521 return -EINVAL;
1522 memcpy(&rtmsg->rtmsg_dst, RTA_DATA(rta[RTA_DST-1]), ((r->rtm_dst_len+7)>>3));
1523 }
1524 if (rta[RTA_SRC-1]) {
1525 if (RTA_PAYLOAD(rta[RTA_SRC-1]) < ((r->rtm_src_len+7)>>3))
1526 return -EINVAL;
1527 memcpy(&rtmsg->rtmsg_src, RTA_DATA(rta[RTA_SRC-1]), ((r->rtm_src_len+7)>>3));
1528 }
1529 if (rta[RTA_OIF-1]) {
1530 if (rta[RTA_OIF-1]->rta_len != RTA_LENGTH(sizeof(int)))
1531 return -EINVAL;
1532 memcpy(&rtmsg->rtmsg_ifindex, RTA_DATA(rta[RTA_OIF-1]), sizeof(int));
1533 }
1534 if (rta[RTA_PRIORITY-1]) {
1535 if (rta[RTA_PRIORITY-1]->rta_len != RTA_LENGTH(4))
1536 return -EINVAL;
1537 memcpy(&rtmsg->rtmsg_metric, RTA_DATA(rta[RTA_PRIORITY-1]), 4);
1538 }
1539 return 0;
1540 }
1541
1542 int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1543 {
1544 struct rtmsg *r = NLMSG_DATA(nlh);
1545 struct in6_rtmsg rtmsg;
1546
1547 if (inet6_rtm_to_rtmsg(r, arg, &rtmsg))
1548 return -EINVAL;
1549 return ip6_route_del(&rtmsg, nlh, arg);
1550 }
1551
1552 int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1553 {
1554 struct rtmsg *r = NLMSG_DATA(nlh);
1555 struct in6_rtmsg rtmsg;
1556
1557 if (inet6_rtm_to_rtmsg(r, arg, &rtmsg))
1558 return -EINVAL;
1559 return ip6_route_add(&rtmsg, nlh, arg);
1560 }
1561
1562 struct rt6_rtnl_dump_arg
1563 {
1564 struct sk_buff *skb;
1565 struct netlink_callback *cb;
1566 };
1567
1568 static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
1569 struct in6_addr *dst,
1570 struct in6_addr *src,
1571 int iif,
1572 int type, u32 pid, u32 seq,
1573 struct nlmsghdr *in_nlh, int prefix)
1574 {
1575 struct rtmsg *rtm;
1576 struct nlmsghdr *nlh;
1577 unsigned char *b = skb->tail;
1578 struct rta_cacheinfo ci;
1579
1580 if (prefix) { /* user wants prefix routes only */
1581 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
1582 /* success since this is not a prefix route */
1583 return 1;
1584 }
1585 }
1586
1587 if (!pid && in_nlh) {
1588 pid = in_nlh->nlmsg_pid;
1589 }
1590
1591 nlh = NLMSG_PUT(skb, pid, seq, type, sizeof(*rtm));
1592 rtm = NLMSG_DATA(nlh);
1593 rtm->rtm_family = AF_INET6;
1594 rtm->rtm_dst_len = rt->rt6i_dst.plen;
1595 rtm->rtm_src_len = rt->rt6i_src.plen;
1596 rtm->rtm_tos = 0;
1597 rtm->rtm_table = RT_TABLE_MAIN;
1598 if (rt->rt6i_flags&RTF_REJECT)
1599 rtm->rtm_type = RTN_UNREACHABLE;
1600 else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
1601 rtm->rtm_type = RTN_LOCAL;
1602 else
1603 rtm->rtm_type = RTN_UNICAST;
1604 rtm->rtm_flags = 0;
1605 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
1606 rtm->rtm_protocol = rt->rt6i_protocol;
1607 if (rt->rt6i_flags&RTF_DYNAMIC)
1608 rtm->rtm_protocol = RTPROT_REDIRECT;
1609 else if (rt->rt6i_flags & RTF_ADDRCONF)
1610 rtm->rtm_protocol = RTPROT_KERNEL;
1611 else if (rt->rt6i_flags&RTF_DEFAULT)
1612 rtm->rtm_protocol = RTPROT_RA;
1613
1614 if (rt->rt6i_flags&RTF_CACHE)
1615 rtm->rtm_flags |= RTM_F_CLONED;
1616
1617 if (dst) {
1618 RTA_PUT(skb, RTA_DST, 16, dst);
1619 rtm->rtm_dst_len = 128;
1620 } else if (rtm->rtm_dst_len)
1621 RTA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
1622 #ifdef CONFIG_IPV6_SUBTREES
1623 if (src) {
1624 RTA_PUT(skb, RTA_SRC, 16, src);
1625 rtm->rtm_src_len = 128;
1626 } else if (rtm->rtm_src_len)
1627 RTA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
1628 #endif
1629 if (iif)
1630 RTA_PUT(skb, RTA_IIF, 4, &iif);
1631 else if (dst) {
1632 struct in6_addr saddr_buf;
1633 if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
1634 RTA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
1635 }
1636 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
1637 goto rtattr_failure;
1638 if (rt->u.dst.neighbour)
1639 RTA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);
1640 if (rt->u.dst.dev)
1641 RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->rt6i_dev->ifindex);
1642 RTA_PUT(skb, RTA_PRIORITY, 4, &rt->rt6i_metric);
1643 ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse);
1644 if (rt->rt6i_expires)
1645 ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies);
1646 else
1647 ci.rta_expires = 0;
1648 ci.rta_used = rt->u.dst.__use;
1649 ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt);
1650 ci.rta_error = rt->u.dst.error;
1651 ci.rta_id = 0;
1652 ci.rta_ts = 0;
1653 ci.rta_tsage = 0;
1654 RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci);
1655 nlh->nlmsg_len = skb->tail - b;
1656 return skb->len;
1657
1658 nlmsg_failure:
1659 rtattr_failure:
1660 skb_trim(skb, b - skb->data);
1661 return -1;
1662 }
1663
1664 static int rt6_dump_route(struct rt6_info *rt, void *p_arg)
1665 {
1666 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
1667 int prefix;
1668
1669 if (arg->cb->nlh->nlmsg_len >= NLMSG_LENGTH(sizeof(struct rtmsg))) {
1670 struct rtmsg *rtm = NLMSG_DATA(arg->cb->nlh);
1671 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
1672 } else
1673 prefix = 0;
1674
1675 return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
1676 NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
1677 NULL, prefix);
1678 }
1679
1680 static int fib6_dump_node(struct fib6_walker_t *w)
1681 {
1682 int res;
1683 struct rt6_info *rt;
1684
1685 for (rt = w->leaf; rt; rt = rt->u.next) {
1686 res = rt6_dump_route(rt, w->args);
1687 if (res < 0) {
1688 /* Frame is full, suspend walking */
1689 w->leaf = rt;
1690 return 1;
1691 }
1692 BUG_TRAP(res!=0);
1693 }
1694 w->leaf = NULL;
1695 return 0;
1696 }
1697
1698 static void fib6_dump_end(struct netlink_callback *cb)
1699 {
1700 struct fib6_walker_t *w = (void*)cb->args[0];
1701
1702 if (w) {
1703 cb->args[0] = 0;
1704 fib6_walker_unlink(w);
1705 kfree(w);
1706 }
1707 if (cb->args[1]) {
1708 cb->done = (void*)cb->args[1];
1709 cb->args[1] = 0;
1710 }
1711 }
1712
1713 static int fib6_dump_done(struct netlink_callback *cb)
1714 {
1715 fib6_dump_end(cb);
1716 return cb->done(cb);
1717 }
1718
1719 int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
1720 {
1721 struct rt6_rtnl_dump_arg arg;
1722 struct fib6_walker_t *w;
1723 int res;
1724
1725 arg.skb = skb;
1726 arg.cb = cb;
1727
1728 w = (void*)cb->args[0];
1729 if (w == NULL) {
1730 /* New dump:
1731 *
1732 * 1. hook callback destructor.
1733 */
1734 cb->args[1] = (long)cb->done;
1735 cb->done = fib6_dump_done;
1736
1737 /*
1738 * 2. allocate and initialize walker.
1739 */
1740 w = kmalloc(sizeof(*w), GFP_ATOMIC);
1741 if (w == NULL)
1742 return -ENOMEM;
1743 RT6_TRACE("dump<%p", w);
1744 memset(w, 0, sizeof(*w));
1745 w->root = &ip6_routing_table;
1746 w->func = fib6_dump_node;
1747 w->args = &arg;
1748 cb->args[0] = (long)w;
1749 read_lock_bh(&rt6_lock);
1750 res = fib6_walk(w);
1751 read_unlock_bh(&rt6_lock);
1752 } else {
1753 w->args = &arg;
1754 read_lock_bh(&rt6_lock);
1755 res = fib6_walk_continue(w);
1756 read_unlock_bh(&rt6_lock);
1757 }
1758 #if RT6_DEBUG >= 3
1759 if (res <= 0 && skb->len == 0)
1760 RT6_TRACE("%p>dump end\n", w);
1761 #endif
1762 res = res < 0 ? res : skb->len;
1763 /* res < 0 is an error. (really, impossible)
1764 res == 0 means that dump is complete, but skb still can contain data.
1765 res > 0 dump is not complete, but frame is full.
1766 */
1767 /* Destroy walker, if dump of this table is complete. */
1768 if (res <= 0)
1769 fib6_dump_end(cb);
1770 return res;
1771 }
1772
1773 int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
1774 {
1775 struct rtattr **rta = arg;
1776 int iif = 0;
1777 int err = -ENOBUFS;
1778 struct sk_buff *skb;
1779 struct flowi fl;
1780 struct rt6_info *rt;
1781
1782 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1783 if (skb == NULL)
1784 goto out;
1785
1786 /* Reserve room for dummy headers, this skb can pass
1787 through good chunk of routing engine.
1788 */
1789 skb->mac.raw = skb->data;
1790 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
1791
1792 memset(&fl, 0, sizeof(fl));
1793 if (rta[RTA_SRC-1])
1794 ipv6_addr_copy(&fl.fl6_src,
1795 (struct in6_addr*)RTA_DATA(rta[RTA_SRC-1]));
1796 if (rta[RTA_DST-1])
1797 ipv6_addr_copy(&fl.fl6_dst,
1798 (struct in6_addr*)RTA_DATA(rta[RTA_DST-1]));
1799
1800 if (rta[RTA_IIF-1])
1801 memcpy(&iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
1802
1803 if (iif) {
1804 struct net_device *dev;
1805 dev = __dev_get_by_index(iif);
1806 if (!dev) {
1807 err = -ENODEV;
1808 goto out_free;
1809 }
1810 }
1811
1812 fl.oif = 0;
1813 if (rta[RTA_OIF-1])
1814 memcpy(&fl.oif, RTA_DATA(rta[RTA_OIF-1]), sizeof(int));
1815
1816 rt = (struct rt6_info*)ip6_route_output(NULL, &fl);
1817
1818 skb->dst = &rt->u.dst;
1819
1820 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
1821 err = rt6_fill_node(skb, rt,
1822 &fl.fl6_dst, &fl.fl6_src,
1823 iif,
1824 RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
1825 nlh->nlmsg_seq, nlh, 0);
1826 if (err < 0) {
1827 err = -EMSGSIZE;
1828 goto out_free;
1829 }
1830
1831 err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
1832 if (err > 0)
1833 err = 0;
1834 out:
1835 return err;
1836 out_free:
1837 kfree_skb(skb);
1838 goto out;
1839 }
1840
1841 void inet6_rt_notify(int event, struct rt6_info *rt, struct nlmsghdr *nlh)
1842 {
1843 struct sk_buff *skb;
1844 int size = NLMSG_SPACE(sizeof(struct rtmsg)+256);
1845
1846 skb = alloc_skb(size, gfp_any());
1847 if (!skb) {
1848 netlink_set_err(rtnl, 0, RTMGRP_IPV6_ROUTE, ENOBUFS);
1849 return;
1850 }
1851 if (rt6_fill_node(skb, rt, NULL, NULL, 0, event, 0, 0, nlh, 0) < 0) {
1852 kfree_skb(skb);
1853 netlink_set_err(rtnl, 0, RTMGRP_IPV6_ROUTE, EINVAL);
1854 return;
1855 }
1856 NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_ROUTE;
1857 netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_ROUTE, gfp_any());
1858 }
1859
1860 /*
1861 * /proc
1862 */
1863
1864 #ifdef CONFIG_PROC_FS
1865
1866 #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1)
1867
1868 struct rt6_proc_arg
1869 {
1870 char *buffer;
1871 int offset;
1872 int length;
1873 int skip;
1874 int len;
1875 };
1876
1877 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
1878 {
1879 struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg;
1880 int i;
1881
1882 if (arg->skip < arg->offset / RT6_INFO_LEN) {
1883 arg->skip++;
1884 return 0;
1885 }
1886
1887 if (arg->len >= arg->length)
1888 return 0;
1889
1890 for (i=0; i<16; i++) {
1891 sprintf(arg->buffer + arg->len, "%02x",
1892 rt->rt6i_dst.addr.s6_addr[i]);
1893 arg->len += 2;
1894 }
1895 arg->len += sprintf(arg->buffer + arg->len, " %02x ",
1896 rt->rt6i_dst.plen);
1897
1898 #ifdef CONFIG_IPV6_SUBTREES
1899 for (i=0; i<16; i++) {
1900 sprintf(arg->buffer + arg->len, "%02x",
1901 rt->rt6i_src.addr.s6_addr[i]);
1902 arg->len += 2;
1903 }
1904 arg->len += sprintf(arg->buffer + arg->len, " %02x ",
1905 rt->rt6i_src.plen);
1906 #else
1907 sprintf(arg->buffer + arg->len,
1908 "00000000000000000000000000000000 00 ");
1909 arg->len += 36;
1910 #endif
1911
1912 if (rt->rt6i_nexthop) {
1913 for (i=0; i<16; i++) {
1914 sprintf(arg->buffer + arg->len, "%02x",
1915 rt->rt6i_nexthop->primary_key[i]);
1916 arg->len += 2;
1917 }
1918 } else {
1919 sprintf(arg->buffer + arg->len,
1920 "00000000000000000000000000000000");
1921 arg->len += 32;
1922 }
1923 arg->len += sprintf(arg->buffer + arg->len,
1924 " %08x %08x %08x %08x %8s\n",
1925 rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
1926 rt->u.dst.__use, rt->rt6i_flags,
1927 rt->rt6i_dev ? rt->rt6i_dev->name : "");
1928 return 0;
1929 }
1930
1931 static int rt6_proc_info(char *buffer, char **start, off_t offset, int length)
1932 {
1933 struct rt6_proc_arg arg;
1934 arg.buffer = buffer;
1935 arg.offset = offset;
1936 arg.length = length;
1937 arg.skip = 0;
1938 arg.len = 0;
1939
1940 read_lock_bh(&rt6_lock);
1941 fib6_clean_tree(&ip6_routing_table, rt6_info_route, 0, &arg);
1942 read_unlock_bh(&rt6_lock);
1943
1944 *start = buffer;
1945 if (offset)
1946 *start += offset % RT6_INFO_LEN;
1947
1948 arg.len -= offset % RT6_INFO_LEN;
1949
1950 if (arg.len > length)
1951 arg.len = length;
1952 if (arg.len < 0)
1953 arg.len = 0;
1954
1955 return arg.len;
1956 }
1957
1958 extern struct rt6_statistics rt6_stats;
1959
1960 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
1961 {
1962 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
1963 rt6_stats.fib_nodes, rt6_stats.fib_route_nodes,
1964 rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries,
1965 rt6_stats.fib_rt_cache,
1966 atomic_read(&ip6_dst_ops.entries),
1967 rt6_stats.fib_discarded_routes);
1968
1969 return 0;
1970 }
1971
1972 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
1973 {
1974 return single_open(file, rt6_stats_seq_show, NULL);
1975 }
1976
1977 static struct file_operations rt6_stats_seq_fops = {
1978 .owner = THIS_MODULE,
1979 .open = rt6_stats_seq_open,
1980 .read = seq_read,
1981 .llseek = seq_lseek,
1982 .release = single_release,
1983 };
1984 #endif /* CONFIG_PROC_FS */
1985
1986 #ifdef CONFIG_SYSCTL
1987
1988 static int flush_delay;
1989
1990 static
1991 int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
1992 void __user *buffer, size_t *lenp, loff_t *ppos)
1993 {
1994 if (write) {
1995 proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1996 fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay);
1997 return 0;
1998 } else
1999 return -EINVAL;
2000 }
2001
2002 ctl_table ipv6_route_table[] = {
2003 {
2004 .ctl_name = NET_IPV6_ROUTE_FLUSH,
2005 .procname = "flush",
2006 .data = &flush_delay,
2007 .maxlen = sizeof(int),
2008 .mode = 0644,
2009 .proc_handler = &ipv6_sysctl_rtcache_flush
2010 },
2011 {
2012 .ctl_name = NET_IPV6_ROUTE_GC_THRESH,
2013 .procname = "gc_thresh",
2014 .data = &ip6_dst_ops.gc_thresh,
2015 .maxlen = sizeof(int),
2016 .mode = 0644,
2017 .proc_handler = &proc_dointvec,
2018 },
2019 {
2020 .ctl_name = NET_IPV6_ROUTE_MAX_SIZE,
2021 .procname = "max_size",
2022 .data = &ip6_rt_max_size,
2023 .maxlen = sizeof(int),
2024 .mode = 0644,
2025 .proc_handler = &proc_dointvec,
2026 },
2027 {
2028 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL,
2029 .procname = "gc_min_interval",
2030 .data = &ip6_rt_gc_min_interval,
2031 .maxlen = sizeof(int),
2032 .mode = 0644,
2033 .proc_handler = &proc_dointvec_jiffies,
2034 .strategy = &sysctl_jiffies,
2035 },
2036 {
2037 .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT,
2038 .procname = "gc_timeout",
2039 .data = &ip6_rt_gc_timeout,
2040 .maxlen = sizeof(int),
2041 .mode = 0644,
2042 .proc_handler = &proc_dointvec_jiffies,
2043 .strategy = &sysctl_jiffies,
2044 },
2045 {
2046 .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL,
2047 .procname = "gc_interval",
2048 .data = &ip6_rt_gc_interval,
2049 .maxlen = sizeof(int),
2050 .mode = 0644,
2051 .proc_handler = &proc_dointvec_jiffies,
2052 .strategy = &sysctl_jiffies,
2053 },
2054 {
2055 .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY,
2056 .procname = "gc_elasticity",
2057 .data = &ip6_rt_gc_elasticity,
2058 .maxlen = sizeof(int),
2059 .mode = 0644,
2060 .proc_handler = &proc_dointvec_jiffies,
2061 .strategy = &sysctl_jiffies,
2062 },
2063 {
2064 .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES,
2065 .procname = "mtu_expires",
2066 .data = &ip6_rt_mtu_expires,
2067 .maxlen = sizeof(int),
2068 .mode = 0644,
2069 .proc_handler = &proc_dointvec_jiffies,
2070 .strategy = &sysctl_jiffies,
2071 },
2072 {
2073 .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS,
2074 .procname = "min_adv_mss",
2075 .data = &ip6_rt_min_advmss,
2076 .maxlen = sizeof(int),
2077 .mode = 0644,
2078 .proc_handler = &proc_dointvec_jiffies,
2079 .strategy = &sysctl_jiffies,
2080 },
2081 {
2082 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
2083 .procname = "gc_min_interval_ms",
2084 .data = &ip6_rt_gc_min_interval,
2085 .maxlen = sizeof(int),
2086 .mode = 0644,
2087 .proc_handler = &proc_dointvec_ms_jiffies,
2088 .strategy = &sysctl_ms_jiffies,
2089 },
2090 { .ctl_name = 0 }
2091 };
2092
2093 #endif
2094
2095 void __init ip6_route_init(void)
2096 {
2097 struct proc_dir_entry *p;
2098
2099 ip6_dst_ops.kmem_cachep = kmem_cache_create("ip6_dst_cache",
2100 sizeof(struct rt6_info),
2101 0, SLAB_HWCACHE_ALIGN,
2102 NULL, NULL);
2103 if (!ip6_dst_ops.kmem_cachep)
2104 panic("cannot create ip6_dst_cache");
2105
2106 fib6_init();
2107 #ifdef CONFIG_PROC_FS
2108 p = proc_net_create("ipv6_route", 0, rt6_proc_info);
2109 if (p)
2110 p->owner = THIS_MODULE;
2111
2112 proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
2113 #endif
2114 #ifdef CONFIG_XFRM
2115 xfrm6_init();
2116 #endif
2117 }
2118
2119 void ip6_route_cleanup(void)
2120 {
2121 #ifdef CONFIG_PROC_FS
2122 proc_net_remove("ipv6_route");
2123 proc_net_remove("rt6_stats");
2124 #endif
2125 #ifdef CONFIG_XFRM
2126 xfrm6_fini();
2127 #endif
2128 rt6_ifdown(NULL);
2129 fib6_gc_cleanup();
2130 kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
2131 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree