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[IPv6] route: FIB6 configuration using struct fib6_config
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / route.c
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/capability.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/if_arp.h>
39
40 #ifdef CONFIG_PROC_FS
41 #include <linux/proc_fs.h>
42 #include <linux/seq_file.h>
43 #endif
44
45 #include <net/snmp.h>
46 #include <net/ipv6.h>
47 #include <net/ip6_fib.h>
48 #include <net/ip6_route.h>
49 #include <net/ndisc.h>
50 #include <net/addrconf.h>
51 #include <net/tcp.h>
52 #include <linux/rtnetlink.h>
53 #include <net/dst.h>
54 #include <net/xfrm.h>
55 #include <net/netevent.h>
56 #include <net/netlink.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 #define CLONE_OFFLINK_ROUTE 0
76
77 #define RT6_SELECT_F_IFACE 0x1
78 #define RT6_SELECT_F_REACHABLE 0x2
79
80 static int ip6_rt_max_size = 4096;
81 static int ip6_rt_gc_min_interval = HZ / 2;
82 static int ip6_rt_gc_timeout = 60*HZ;
83 int ip6_rt_gc_interval = 30*HZ;
84 static int ip6_rt_gc_elasticity = 9;
85 static int ip6_rt_mtu_expires = 10*60*HZ;
86 static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
87
88 static struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
89 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
90 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
91 static void ip6_dst_destroy(struct dst_entry *);
92 static void ip6_dst_ifdown(struct dst_entry *,
93 struct net_device *dev, int how);
94 static int ip6_dst_gc(void);
95
96 static int ip6_pkt_discard(struct sk_buff *skb);
97 static int ip6_pkt_discard_out(struct sk_buff *skb);
98 static void ip6_link_failure(struct sk_buff *skb);
99 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
100
101 #ifdef CONFIG_IPV6_ROUTE_INFO
102 static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
103 struct in6_addr *gwaddr, int ifindex,
104 unsigned pref);
105 static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
106 struct in6_addr *gwaddr, int ifindex);
107 #endif
108
109 static struct dst_ops ip6_dst_ops = {
110 .family = AF_INET6,
111 .protocol = __constant_htons(ETH_P_IPV6),
112 .gc = ip6_dst_gc,
113 .gc_thresh = 1024,
114 .check = ip6_dst_check,
115 .destroy = ip6_dst_destroy,
116 .ifdown = ip6_dst_ifdown,
117 .negative_advice = ip6_negative_advice,
118 .link_failure = ip6_link_failure,
119 .update_pmtu = ip6_rt_update_pmtu,
120 .entry_size = sizeof(struct rt6_info),
121 };
122
123 struct rt6_info ip6_null_entry = {
124 .u = {
125 .dst = {
126 .__refcnt = ATOMIC_INIT(1),
127 .__use = 1,
128 .dev = &loopback_dev,
129 .obsolete = -1,
130 .error = -ENETUNREACH,
131 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
132 .input = ip6_pkt_discard,
133 .output = ip6_pkt_discard_out,
134 .ops = &ip6_dst_ops,
135 .path = (struct dst_entry*)&ip6_null_entry,
136 }
137 },
138 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
139 .rt6i_metric = ~(u32) 0,
140 .rt6i_ref = ATOMIC_INIT(1),
141 };
142
143 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
144
145 struct rt6_info ip6_prohibit_entry = {
146 .u = {
147 .dst = {
148 .__refcnt = ATOMIC_INIT(1),
149 .__use = 1,
150 .dev = &loopback_dev,
151 .obsolete = -1,
152 .error = -EACCES,
153 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
154 .input = ip6_pkt_discard,
155 .output = ip6_pkt_discard_out,
156 .ops = &ip6_dst_ops,
157 .path = (struct dst_entry*)&ip6_prohibit_entry,
158 }
159 },
160 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
161 .rt6i_metric = ~(u32) 0,
162 .rt6i_ref = ATOMIC_INIT(1),
163 };
164
165 struct rt6_info ip6_blk_hole_entry = {
166 .u = {
167 .dst = {
168 .__refcnt = ATOMIC_INIT(1),
169 .__use = 1,
170 .dev = &loopback_dev,
171 .obsolete = -1,
172 .error = -EINVAL,
173 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
174 .input = ip6_pkt_discard,
175 .output = ip6_pkt_discard_out,
176 .ops = &ip6_dst_ops,
177 .path = (struct dst_entry*)&ip6_blk_hole_entry,
178 }
179 },
180 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
181 .rt6i_metric = ~(u32) 0,
182 .rt6i_ref = ATOMIC_INIT(1),
183 };
184
185 #endif
186
187 /* allocate dst with ip6_dst_ops */
188 static __inline__ struct rt6_info *ip6_dst_alloc(void)
189 {
190 return (struct rt6_info *)dst_alloc(&ip6_dst_ops);
191 }
192
193 static void ip6_dst_destroy(struct dst_entry *dst)
194 {
195 struct rt6_info *rt = (struct rt6_info *)dst;
196 struct inet6_dev *idev = rt->rt6i_idev;
197
198 if (idev != NULL) {
199 rt->rt6i_idev = NULL;
200 in6_dev_put(idev);
201 }
202 }
203
204 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
205 int how)
206 {
207 struct rt6_info *rt = (struct rt6_info *)dst;
208 struct inet6_dev *idev = rt->rt6i_idev;
209
210 if (dev != &loopback_dev && idev != NULL && idev->dev == dev) {
211 struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
212 if (loopback_idev != NULL) {
213 rt->rt6i_idev = loopback_idev;
214 in6_dev_put(idev);
215 }
216 }
217 }
218
219 static __inline__ int rt6_check_expired(const struct rt6_info *rt)
220 {
221 return (rt->rt6i_flags & RTF_EXPIRES &&
222 time_after(jiffies, rt->rt6i_expires));
223 }
224
225 static inline int rt6_need_strict(struct in6_addr *daddr)
226 {
227 return (ipv6_addr_type(daddr) &
228 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
229 }
230
231 /*
232 * Route lookup. Any table->tb6_lock is implied.
233 */
234
235 static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt,
236 int oif,
237 int strict)
238 {
239 struct rt6_info *local = NULL;
240 struct rt6_info *sprt;
241
242 if (oif) {
243 for (sprt = rt; sprt; sprt = sprt->u.next) {
244 struct net_device *dev = sprt->rt6i_dev;
245 if (dev->ifindex == oif)
246 return sprt;
247 if (dev->flags & IFF_LOOPBACK) {
248 if (sprt->rt6i_idev == NULL ||
249 sprt->rt6i_idev->dev->ifindex != oif) {
250 if (strict && oif)
251 continue;
252 if (local && (!oif ||
253 local->rt6i_idev->dev->ifindex == oif))
254 continue;
255 }
256 local = sprt;
257 }
258 }
259
260 if (local)
261 return local;
262
263 if (strict)
264 return &ip6_null_entry;
265 }
266 return rt;
267 }
268
269 #ifdef CONFIG_IPV6_ROUTER_PREF
270 static void rt6_probe(struct rt6_info *rt)
271 {
272 struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL;
273 /*
274 * Okay, this does not seem to be appropriate
275 * for now, however, we need to check if it
276 * is really so; aka Router Reachability Probing.
277 *
278 * Router Reachability Probe MUST be rate-limited
279 * to no more than one per minute.
280 */
281 if (!neigh || (neigh->nud_state & NUD_VALID))
282 return;
283 read_lock_bh(&neigh->lock);
284 if (!(neigh->nud_state & NUD_VALID) &&
285 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
286 struct in6_addr mcaddr;
287 struct in6_addr *target;
288
289 neigh->updated = jiffies;
290 read_unlock_bh(&neigh->lock);
291
292 target = (struct in6_addr *)&neigh->primary_key;
293 addrconf_addr_solict_mult(target, &mcaddr);
294 ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL);
295 } else
296 read_unlock_bh(&neigh->lock);
297 }
298 #else
299 static inline void rt6_probe(struct rt6_info *rt)
300 {
301 return;
302 }
303 #endif
304
305 /*
306 * Default Router Selection (RFC 2461 6.3.6)
307 */
308 static int inline rt6_check_dev(struct rt6_info *rt, int oif)
309 {
310 struct net_device *dev = rt->rt6i_dev;
311 if (!oif || dev->ifindex == oif)
312 return 2;
313 if ((dev->flags & IFF_LOOPBACK) &&
314 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
315 return 1;
316 return 0;
317 }
318
319 static int inline rt6_check_neigh(struct rt6_info *rt)
320 {
321 struct neighbour *neigh = rt->rt6i_nexthop;
322 int m = 0;
323 if (rt->rt6i_flags & RTF_NONEXTHOP ||
324 !(rt->rt6i_flags & RTF_GATEWAY))
325 m = 1;
326 else if (neigh) {
327 read_lock_bh(&neigh->lock);
328 if (neigh->nud_state & NUD_VALID)
329 m = 2;
330 read_unlock_bh(&neigh->lock);
331 }
332 return m;
333 }
334
335 static int rt6_score_route(struct rt6_info *rt, int oif,
336 int strict)
337 {
338 int m, n;
339
340 m = rt6_check_dev(rt, oif);
341 if (!m && (strict & RT6_SELECT_F_IFACE))
342 return -1;
343 #ifdef CONFIG_IPV6_ROUTER_PREF
344 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
345 #endif
346 n = rt6_check_neigh(rt);
347 if (n > 1)
348 m |= 16;
349 else if (!n && strict & RT6_SELECT_F_REACHABLE)
350 return -1;
351 return m;
352 }
353
354 static struct rt6_info *rt6_select(struct rt6_info **head, int oif,
355 int strict)
356 {
357 struct rt6_info *match = NULL, *last = NULL;
358 struct rt6_info *rt, *rt0 = *head;
359 u32 metric;
360 int mpri = -1;
361
362 RT6_TRACE("%s(head=%p(*head=%p), oif=%d)\n",
363 __FUNCTION__, head, head ? *head : NULL, oif);
364
365 for (rt = rt0, metric = rt0->rt6i_metric;
366 rt && rt->rt6i_metric == metric && (!last || rt != rt0);
367 rt = rt->u.next) {
368 int m;
369
370 if (rt6_check_expired(rt))
371 continue;
372
373 last = rt;
374
375 m = rt6_score_route(rt, oif, strict);
376 if (m < 0)
377 continue;
378
379 if (m > mpri) {
380 rt6_probe(match);
381 match = rt;
382 mpri = m;
383 } else {
384 rt6_probe(rt);
385 }
386 }
387
388 if (!match &&
389 (strict & RT6_SELECT_F_REACHABLE) &&
390 last && last != rt0) {
391 /* no entries matched; do round-robin */
392 static DEFINE_SPINLOCK(lock);
393 spin_lock(&lock);
394 *head = rt0->u.next;
395 rt0->u.next = last->u.next;
396 last->u.next = rt0;
397 spin_unlock(&lock);
398 }
399
400 RT6_TRACE("%s() => %p, score=%d\n",
401 __FUNCTION__, match, mpri);
402
403 return (match ? match : &ip6_null_entry);
404 }
405
406 #ifdef CONFIG_IPV6_ROUTE_INFO
407 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
408 struct in6_addr *gwaddr)
409 {
410 struct route_info *rinfo = (struct route_info *) opt;
411 struct in6_addr prefix_buf, *prefix;
412 unsigned int pref;
413 u32 lifetime;
414 struct rt6_info *rt;
415
416 if (len < sizeof(struct route_info)) {
417 return -EINVAL;
418 }
419
420 /* Sanity check for prefix_len and length */
421 if (rinfo->length > 3) {
422 return -EINVAL;
423 } else if (rinfo->prefix_len > 128) {
424 return -EINVAL;
425 } else if (rinfo->prefix_len > 64) {
426 if (rinfo->length < 2) {
427 return -EINVAL;
428 }
429 } else if (rinfo->prefix_len > 0) {
430 if (rinfo->length < 1) {
431 return -EINVAL;
432 }
433 }
434
435 pref = rinfo->route_pref;
436 if (pref == ICMPV6_ROUTER_PREF_INVALID)
437 pref = ICMPV6_ROUTER_PREF_MEDIUM;
438
439 lifetime = htonl(rinfo->lifetime);
440 if (lifetime == 0xffffffff) {
441 /* infinity */
442 } else if (lifetime > 0x7fffffff/HZ) {
443 /* Avoid arithmetic overflow */
444 lifetime = 0x7fffffff/HZ - 1;
445 }
446
447 if (rinfo->length == 3)
448 prefix = (struct in6_addr *)rinfo->prefix;
449 else {
450 /* this function is safe */
451 ipv6_addr_prefix(&prefix_buf,
452 (struct in6_addr *)rinfo->prefix,
453 rinfo->prefix_len);
454 prefix = &prefix_buf;
455 }
456
457 rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex);
458
459 if (rt && !lifetime) {
460 ip6_del_rt(rt);
461 rt = NULL;
462 }
463
464 if (!rt && lifetime)
465 rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
466 pref);
467 else if (rt)
468 rt->rt6i_flags = RTF_ROUTEINFO |
469 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
470
471 if (rt) {
472 if (lifetime == 0xffffffff) {
473 rt->rt6i_flags &= ~RTF_EXPIRES;
474 } else {
475 rt->rt6i_expires = jiffies + HZ * lifetime;
476 rt->rt6i_flags |= RTF_EXPIRES;
477 }
478 dst_release(&rt->u.dst);
479 }
480 return 0;
481 }
482 #endif
483
484 #define BACKTRACK() \
485 if (rt == &ip6_null_entry && flags & RT6_F_STRICT) { \
486 while ((fn = fn->parent) != NULL) { \
487 if (fn->fn_flags & RTN_TL_ROOT) { \
488 dst_hold(&rt->u.dst); \
489 goto out; \
490 } \
491 if (fn->fn_flags & RTN_RTINFO) \
492 goto restart; \
493 } \
494 }
495
496 static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table,
497 struct flowi *fl, int flags)
498 {
499 struct fib6_node *fn;
500 struct rt6_info *rt;
501
502 read_lock_bh(&table->tb6_lock);
503 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
504 restart:
505 rt = fn->leaf;
506 rt = rt6_device_match(rt, fl->oif, flags & RT6_F_STRICT);
507 BACKTRACK();
508 dst_hold(&rt->u.dst);
509 out:
510 read_unlock_bh(&table->tb6_lock);
511
512 rt->u.dst.lastuse = jiffies;
513 rt->u.dst.__use++;
514
515 return rt;
516
517 }
518
519 struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
520 int oif, int strict)
521 {
522 struct flowi fl = {
523 .oif = oif,
524 .nl_u = {
525 .ip6_u = {
526 .daddr = *daddr,
527 /* TODO: saddr */
528 },
529 },
530 };
531 struct dst_entry *dst;
532 int flags = strict ? RT6_F_STRICT : 0;
533
534 dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup);
535 if (dst->error == 0)
536 return (struct rt6_info *) dst;
537
538 dst_release(dst);
539
540 return NULL;
541 }
542
543 /* ip6_ins_rt is called with FREE table->tb6_lock.
544 It takes new route entry, the addition fails by any reason the
545 route is freed. In any case, if caller does not hold it, it may
546 be destroyed.
547 */
548
549 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
550 {
551 int err;
552 struct fib6_table *table;
553
554 table = rt->rt6i_table;
555 write_lock_bh(&table->tb6_lock);
556 err = fib6_add(&table->tb6_root, rt, info);
557 write_unlock_bh(&table->tb6_lock);
558
559 return err;
560 }
561
562 int ip6_ins_rt(struct rt6_info *rt)
563 {
564 return __ip6_ins_rt(rt, NULL);
565 }
566
567 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
568 struct in6_addr *saddr)
569 {
570 struct rt6_info *rt;
571
572 /*
573 * Clone the route.
574 */
575
576 rt = ip6_rt_copy(ort);
577
578 if (rt) {
579 if (!(rt->rt6i_flags&RTF_GATEWAY)) {
580 if (rt->rt6i_dst.plen != 128 &&
581 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr))
582 rt->rt6i_flags |= RTF_ANYCAST;
583 ipv6_addr_copy(&rt->rt6i_gateway, daddr);
584 }
585
586 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
587 rt->rt6i_dst.plen = 128;
588 rt->rt6i_flags |= RTF_CACHE;
589 rt->u.dst.flags |= DST_HOST;
590
591 #ifdef CONFIG_IPV6_SUBTREES
592 if (rt->rt6i_src.plen && saddr) {
593 ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
594 rt->rt6i_src.plen = 128;
595 }
596 #endif
597
598 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
599
600 }
601
602 return rt;
603 }
604
605 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr)
606 {
607 struct rt6_info *rt = ip6_rt_copy(ort);
608 if (rt) {
609 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
610 rt->rt6i_dst.plen = 128;
611 rt->rt6i_flags |= RTF_CACHE;
612 if (rt->rt6i_flags & RTF_REJECT)
613 rt->u.dst.error = ort->u.dst.error;
614 rt->u.dst.flags |= DST_HOST;
615 rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
616 }
617 return rt;
618 }
619
620 static struct rt6_info *ip6_pol_route_input(struct fib6_table *table,
621 struct flowi *fl, int flags)
622 {
623 struct fib6_node *fn;
624 struct rt6_info *rt, *nrt;
625 int strict = 0;
626 int attempts = 3;
627 int err;
628 int reachable = RT6_SELECT_F_REACHABLE;
629
630 if (flags & RT6_F_STRICT)
631 strict = RT6_SELECT_F_IFACE;
632
633 relookup:
634 read_lock_bh(&table->tb6_lock);
635
636 restart_2:
637 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
638
639 restart:
640 rt = rt6_select(&fn->leaf, fl->iif, strict | reachable);
641 BACKTRACK();
642 if (rt == &ip6_null_entry ||
643 rt->rt6i_flags & RTF_CACHE)
644 goto out;
645
646 dst_hold(&rt->u.dst);
647 read_unlock_bh(&table->tb6_lock);
648
649 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
650 nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
651 else {
652 #if CLONE_OFFLINK_ROUTE
653 nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
654 #else
655 goto out2;
656 #endif
657 }
658
659 dst_release(&rt->u.dst);
660 rt = nrt ? : &ip6_null_entry;
661
662 dst_hold(&rt->u.dst);
663 if (nrt) {
664 err = ip6_ins_rt(nrt);
665 if (!err)
666 goto out2;
667 }
668
669 if (--attempts <= 0)
670 goto out2;
671
672 /*
673 * Race condition! In the gap, when table->tb6_lock was
674 * released someone could insert this route. Relookup.
675 */
676 dst_release(&rt->u.dst);
677 goto relookup;
678
679 out:
680 if (reachable) {
681 reachable = 0;
682 goto restart_2;
683 }
684 dst_hold(&rt->u.dst);
685 read_unlock_bh(&table->tb6_lock);
686 out2:
687 rt->u.dst.lastuse = jiffies;
688 rt->u.dst.__use++;
689
690 return rt;
691 }
692
693 void ip6_route_input(struct sk_buff *skb)
694 {
695 struct ipv6hdr *iph = skb->nh.ipv6h;
696 struct flowi fl = {
697 .iif = skb->dev->ifindex,
698 .nl_u = {
699 .ip6_u = {
700 .daddr = iph->daddr,
701 .saddr = iph->saddr,
702 .flowlabel = (* (u32 *) iph)&IPV6_FLOWINFO_MASK,
703 },
704 },
705 .proto = iph->nexthdr,
706 };
707 int flags = 0;
708
709 if (rt6_need_strict(&iph->daddr))
710 flags |= RT6_F_STRICT;
711
712 skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input);
713 }
714
715 static struct rt6_info *ip6_pol_route_output(struct fib6_table *table,
716 struct flowi *fl, int flags)
717 {
718 struct fib6_node *fn;
719 struct rt6_info *rt, *nrt;
720 int strict = 0;
721 int attempts = 3;
722 int err;
723 int reachable = RT6_SELECT_F_REACHABLE;
724
725 if (flags & RT6_F_STRICT)
726 strict = RT6_SELECT_F_IFACE;
727
728 relookup:
729 read_lock_bh(&table->tb6_lock);
730
731 restart_2:
732 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
733
734 restart:
735 rt = rt6_select(&fn->leaf, fl->oif, strict | reachable);
736 BACKTRACK();
737 if (rt == &ip6_null_entry ||
738 rt->rt6i_flags & RTF_CACHE)
739 goto out;
740
741 dst_hold(&rt->u.dst);
742 read_unlock_bh(&table->tb6_lock);
743
744 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
745 nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
746 else {
747 #if CLONE_OFFLINK_ROUTE
748 nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
749 #else
750 goto out2;
751 #endif
752 }
753
754 dst_release(&rt->u.dst);
755 rt = nrt ? : &ip6_null_entry;
756
757 dst_hold(&rt->u.dst);
758 if (nrt) {
759 err = ip6_ins_rt(nrt);
760 if (!err)
761 goto out2;
762 }
763
764 if (--attempts <= 0)
765 goto out2;
766
767 /*
768 * Race condition! In the gap, when table->tb6_lock was
769 * released someone could insert this route. Relookup.
770 */
771 dst_release(&rt->u.dst);
772 goto relookup;
773
774 out:
775 if (reachable) {
776 reachable = 0;
777 goto restart_2;
778 }
779 dst_hold(&rt->u.dst);
780 read_unlock_bh(&table->tb6_lock);
781 out2:
782 rt->u.dst.lastuse = jiffies;
783 rt->u.dst.__use++;
784 return rt;
785 }
786
787 struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
788 {
789 int flags = 0;
790
791 if (rt6_need_strict(&fl->fl6_dst))
792 flags |= RT6_F_STRICT;
793
794 return fib6_rule_lookup(fl, flags, ip6_pol_route_output);
795 }
796
797
798 /*
799 * Destination cache support functions
800 */
801
802 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
803 {
804 struct rt6_info *rt;
805
806 rt = (struct rt6_info *) dst;
807
808 if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
809 return dst;
810
811 return NULL;
812 }
813
814 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
815 {
816 struct rt6_info *rt = (struct rt6_info *) dst;
817
818 if (rt) {
819 if (rt->rt6i_flags & RTF_CACHE)
820 ip6_del_rt(rt);
821 else
822 dst_release(dst);
823 }
824 return NULL;
825 }
826
827 static void ip6_link_failure(struct sk_buff *skb)
828 {
829 struct rt6_info *rt;
830
831 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
832
833 rt = (struct rt6_info *) skb->dst;
834 if (rt) {
835 if (rt->rt6i_flags&RTF_CACHE) {
836 dst_set_expires(&rt->u.dst, 0);
837 rt->rt6i_flags |= RTF_EXPIRES;
838 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
839 rt->rt6i_node->fn_sernum = -1;
840 }
841 }
842
843 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
844 {
845 struct rt6_info *rt6 = (struct rt6_info*)dst;
846
847 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
848 rt6->rt6i_flags |= RTF_MODIFIED;
849 if (mtu < IPV6_MIN_MTU) {
850 mtu = IPV6_MIN_MTU;
851 dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
852 }
853 dst->metrics[RTAX_MTU-1] = mtu;
854 call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
855 }
856 }
857
858 static int ipv6_get_mtu(struct net_device *dev);
859
860 static inline unsigned int ipv6_advmss(unsigned int mtu)
861 {
862 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
863
864 if (mtu < ip6_rt_min_advmss)
865 mtu = ip6_rt_min_advmss;
866
867 /*
868 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
869 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
870 * IPV6_MAXPLEN is also valid and means: "any MSS,
871 * rely only on pmtu discovery"
872 */
873 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
874 mtu = IPV6_MAXPLEN;
875 return mtu;
876 }
877
878 static struct dst_entry *ndisc_dst_gc_list;
879 static DEFINE_SPINLOCK(ndisc_lock);
880
881 struct dst_entry *ndisc_dst_alloc(struct net_device *dev,
882 struct neighbour *neigh,
883 struct in6_addr *addr,
884 int (*output)(struct sk_buff *))
885 {
886 struct rt6_info *rt;
887 struct inet6_dev *idev = in6_dev_get(dev);
888
889 if (unlikely(idev == NULL))
890 return NULL;
891
892 rt = ip6_dst_alloc();
893 if (unlikely(rt == NULL)) {
894 in6_dev_put(idev);
895 goto out;
896 }
897
898 dev_hold(dev);
899 if (neigh)
900 neigh_hold(neigh);
901 else
902 neigh = ndisc_get_neigh(dev, addr);
903
904 rt->rt6i_dev = dev;
905 rt->rt6i_idev = idev;
906 rt->rt6i_nexthop = neigh;
907 atomic_set(&rt->u.dst.__refcnt, 1);
908 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
909 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
910 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
911 rt->u.dst.output = output;
912
913 #if 0 /* there's no chance to use these for ndisc */
914 rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
915 ? DST_HOST
916 : 0;
917 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
918 rt->rt6i_dst.plen = 128;
919 #endif
920
921 spin_lock_bh(&ndisc_lock);
922 rt->u.dst.next = ndisc_dst_gc_list;
923 ndisc_dst_gc_list = &rt->u.dst;
924 spin_unlock_bh(&ndisc_lock);
925
926 fib6_force_start_gc();
927
928 out:
929 return (struct dst_entry *)rt;
930 }
931
932 int ndisc_dst_gc(int *more)
933 {
934 struct dst_entry *dst, *next, **pprev;
935 int freed;
936
937 next = NULL;
938 freed = 0;
939
940 spin_lock_bh(&ndisc_lock);
941 pprev = &ndisc_dst_gc_list;
942
943 while ((dst = *pprev) != NULL) {
944 if (!atomic_read(&dst->__refcnt)) {
945 *pprev = dst->next;
946 dst_free(dst);
947 freed++;
948 } else {
949 pprev = &dst->next;
950 (*more)++;
951 }
952 }
953
954 spin_unlock_bh(&ndisc_lock);
955
956 return freed;
957 }
958
959 static int ip6_dst_gc(void)
960 {
961 static unsigned expire = 30*HZ;
962 static unsigned long last_gc;
963 unsigned long now = jiffies;
964
965 if (time_after(last_gc + ip6_rt_gc_min_interval, now) &&
966 atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size)
967 goto out;
968
969 expire++;
970 fib6_run_gc(expire);
971 last_gc = now;
972 if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh)
973 expire = ip6_rt_gc_timeout>>1;
974
975 out:
976 expire -= expire>>ip6_rt_gc_elasticity;
977 return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size);
978 }
979
980 /* Clean host part of a prefix. Not necessary in radix tree,
981 but results in cleaner routing tables.
982
983 Remove it only when all the things will work!
984 */
985
986 static int ipv6_get_mtu(struct net_device *dev)
987 {
988 int mtu = IPV6_MIN_MTU;
989 struct inet6_dev *idev;
990
991 idev = in6_dev_get(dev);
992 if (idev) {
993 mtu = idev->cnf.mtu6;
994 in6_dev_put(idev);
995 }
996 return mtu;
997 }
998
999 int ipv6_get_hoplimit(struct net_device *dev)
1000 {
1001 int hoplimit = ipv6_devconf.hop_limit;
1002 struct inet6_dev *idev;
1003
1004 idev = in6_dev_get(dev);
1005 if (idev) {
1006 hoplimit = idev->cnf.hop_limit;
1007 in6_dev_put(idev);
1008 }
1009 return hoplimit;
1010 }
1011
1012 /*
1013 *
1014 */
1015
1016 int ip6_route_add(struct fib6_config *cfg)
1017 {
1018 int err;
1019 struct rt6_info *rt = NULL;
1020 struct net_device *dev = NULL;
1021 struct inet6_dev *idev = NULL;
1022 struct fib6_table *table;
1023 int addr_type;
1024
1025 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1026 return -EINVAL;
1027 #ifndef CONFIG_IPV6_SUBTREES
1028 if (cfg->fc_src_len)
1029 return -EINVAL;
1030 #endif
1031 if (cfg->fc_ifindex) {
1032 err = -ENODEV;
1033 dev = dev_get_by_index(cfg->fc_ifindex);
1034 if (!dev)
1035 goto out;
1036 idev = in6_dev_get(dev);
1037 if (!idev)
1038 goto out;
1039 }
1040
1041 if (cfg->fc_metric == 0)
1042 cfg->fc_metric = IP6_RT_PRIO_USER;
1043
1044 table = fib6_new_table(cfg->fc_table);
1045 if (table == NULL) {
1046 err = -ENOBUFS;
1047 goto out;
1048 }
1049
1050 rt = ip6_dst_alloc();
1051
1052 if (rt == NULL) {
1053 err = -ENOMEM;
1054 goto out;
1055 }
1056
1057 rt->u.dst.obsolete = -1;
1058 rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires);
1059
1060 if (cfg->fc_protocol == RTPROT_UNSPEC)
1061 cfg->fc_protocol = RTPROT_BOOT;
1062 rt->rt6i_protocol = cfg->fc_protocol;
1063
1064 addr_type = ipv6_addr_type(&cfg->fc_dst);
1065
1066 if (addr_type & IPV6_ADDR_MULTICAST)
1067 rt->u.dst.input = ip6_mc_input;
1068 else
1069 rt->u.dst.input = ip6_forward;
1070
1071 rt->u.dst.output = ip6_output;
1072
1073 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1074 rt->rt6i_dst.plen = cfg->fc_dst_len;
1075 if (rt->rt6i_dst.plen == 128)
1076 rt->u.dst.flags = DST_HOST;
1077
1078 #ifdef CONFIG_IPV6_SUBTREES
1079 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1080 rt->rt6i_src.plen = cfg->fc_src_len;
1081 #endif
1082
1083 rt->rt6i_metric = cfg->fc_metric;
1084
1085 /* We cannot add true routes via loopback here,
1086 they would result in kernel looping; promote them to reject routes
1087 */
1088 if ((cfg->fc_flags & RTF_REJECT) ||
1089 (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
1090 /* hold loopback dev/idev if we haven't done so. */
1091 if (dev != &loopback_dev) {
1092 if (dev) {
1093 dev_put(dev);
1094 in6_dev_put(idev);
1095 }
1096 dev = &loopback_dev;
1097 dev_hold(dev);
1098 idev = in6_dev_get(dev);
1099 if (!idev) {
1100 err = -ENODEV;
1101 goto out;
1102 }
1103 }
1104 rt->u.dst.output = ip6_pkt_discard_out;
1105 rt->u.dst.input = ip6_pkt_discard;
1106 rt->u.dst.error = -ENETUNREACH;
1107 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1108 goto install_route;
1109 }
1110
1111 if (cfg->fc_flags & RTF_GATEWAY) {
1112 struct in6_addr *gw_addr;
1113 int gwa_type;
1114
1115 gw_addr = &cfg->fc_gateway;
1116 ipv6_addr_copy(&rt->rt6i_gateway, gw_addr);
1117 gwa_type = ipv6_addr_type(gw_addr);
1118
1119 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1120 struct rt6_info *grt;
1121
1122 /* IPv6 strictly inhibits using not link-local
1123 addresses as nexthop address.
1124 Otherwise, router will not able to send redirects.
1125 It is very good, but in some (rare!) circumstances
1126 (SIT, PtP, NBMA NOARP links) it is handy to allow
1127 some exceptions. --ANK
1128 */
1129 err = -EINVAL;
1130 if (!(gwa_type&IPV6_ADDR_UNICAST))
1131 goto out;
1132
1133 grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1);
1134
1135 err = -EHOSTUNREACH;
1136 if (grt == NULL)
1137 goto out;
1138 if (dev) {
1139 if (dev != grt->rt6i_dev) {
1140 dst_release(&grt->u.dst);
1141 goto out;
1142 }
1143 } else {
1144 dev = grt->rt6i_dev;
1145 idev = grt->rt6i_idev;
1146 dev_hold(dev);
1147 in6_dev_hold(grt->rt6i_idev);
1148 }
1149 if (!(grt->rt6i_flags&RTF_GATEWAY))
1150 err = 0;
1151 dst_release(&grt->u.dst);
1152
1153 if (err)
1154 goto out;
1155 }
1156 err = -EINVAL;
1157 if (dev == NULL || (dev->flags&IFF_LOOPBACK))
1158 goto out;
1159 }
1160
1161 err = -ENODEV;
1162 if (dev == NULL)
1163 goto out;
1164
1165 if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
1166 rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
1167 if (IS_ERR(rt->rt6i_nexthop)) {
1168 err = PTR_ERR(rt->rt6i_nexthop);
1169 rt->rt6i_nexthop = NULL;
1170 goto out;
1171 }
1172 }
1173
1174 rt->rt6i_flags = cfg->fc_flags;
1175
1176 install_route:
1177 if (cfg->fc_mx) {
1178 struct nlattr *nla;
1179 int remaining;
1180
1181 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1182 int type = nla->nla_type;
1183
1184 if (type) {
1185 if (type > RTAX_MAX) {
1186 err = -EINVAL;
1187 goto out;
1188 }
1189
1190 rt->u.dst.metrics[type - 1] = nla_get_u32(nla);
1191 }
1192 }
1193 }
1194
1195 if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
1196 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1197 if (!rt->u.dst.metrics[RTAX_MTU-1])
1198 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
1199 if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
1200 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
1201 rt->u.dst.dev = dev;
1202 rt->rt6i_idev = idev;
1203 rt->rt6i_table = table;
1204 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1205
1206 out:
1207 if (dev)
1208 dev_put(dev);
1209 if (idev)
1210 in6_dev_put(idev);
1211 if (rt)
1212 dst_free((struct dst_entry *) rt);
1213 return err;
1214 }
1215
1216 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1217 {
1218 int err;
1219 struct fib6_table *table;
1220
1221 if (rt == &ip6_null_entry)
1222 return -ENOENT;
1223
1224 table = rt->rt6i_table;
1225 write_lock_bh(&table->tb6_lock);
1226
1227 err = fib6_del(rt, info);
1228 dst_release(&rt->u.dst);
1229
1230 write_unlock_bh(&table->tb6_lock);
1231
1232 return err;
1233 }
1234
1235 int ip6_del_rt(struct rt6_info *rt)
1236 {
1237 return __ip6_del_rt(rt, NULL);
1238 }
1239
1240 static int ip6_route_del(struct fib6_config *cfg)
1241 {
1242 struct fib6_table *table;
1243 struct fib6_node *fn;
1244 struct rt6_info *rt;
1245 int err = -ESRCH;
1246
1247 table = fib6_get_table(cfg->fc_table);
1248 if (table == NULL)
1249 return err;
1250
1251 read_lock_bh(&table->tb6_lock);
1252
1253 fn = fib6_locate(&table->tb6_root,
1254 &cfg->fc_dst, cfg->fc_dst_len,
1255 &cfg->fc_src, cfg->fc_src_len);
1256
1257 if (fn) {
1258 for (rt = fn->leaf; rt; rt = rt->u.next) {
1259 if (cfg->fc_ifindex &&
1260 (rt->rt6i_dev == NULL ||
1261 rt->rt6i_dev->ifindex != cfg->fc_ifindex))
1262 continue;
1263 if (cfg->fc_flags & RTF_GATEWAY &&
1264 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1265 continue;
1266 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1267 continue;
1268 dst_hold(&rt->u.dst);
1269 read_unlock_bh(&table->tb6_lock);
1270
1271 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1272 }
1273 }
1274 read_unlock_bh(&table->tb6_lock);
1275
1276 return err;
1277 }
1278
1279 /*
1280 * Handle redirects
1281 */
1282 void rt6_redirect(struct in6_addr *dest, struct in6_addr *saddr,
1283 struct neighbour *neigh, u8 *lladdr, int on_link)
1284 {
1285 struct rt6_info *rt, *nrt = NULL;
1286 struct fib6_node *fn;
1287 struct fib6_table *table;
1288 struct netevent_redirect netevent;
1289
1290 /* TODO: Very lazy, might need to check all tables */
1291 table = fib6_get_table(RT6_TABLE_MAIN);
1292 if (table == NULL)
1293 return;
1294
1295 /*
1296 * Get the "current" route for this destination and
1297 * check if the redirect has come from approriate router.
1298 *
1299 * RFC 2461 specifies that redirects should only be
1300 * accepted if they come from the nexthop to the target.
1301 * Due to the way the routes are chosen, this notion
1302 * is a bit fuzzy and one might need to check all possible
1303 * routes.
1304 */
1305
1306 read_lock_bh(&table->tb6_lock);
1307 fn = fib6_lookup(&table->tb6_root, dest, NULL);
1308 restart:
1309 for (rt = fn->leaf; rt; rt = rt->u.next) {
1310 /*
1311 * Current route is on-link; redirect is always invalid.
1312 *
1313 * Seems, previous statement is not true. It could
1314 * be node, which looks for us as on-link (f.e. proxy ndisc)
1315 * But then router serving it might decide, that we should
1316 * know truth 8)8) --ANK (980726).
1317 */
1318 if (rt6_check_expired(rt))
1319 continue;
1320 if (!(rt->rt6i_flags & RTF_GATEWAY))
1321 continue;
1322 if (neigh->dev != rt->rt6i_dev)
1323 continue;
1324 if (!ipv6_addr_equal(saddr, &rt->rt6i_gateway))
1325 continue;
1326 break;
1327 }
1328 if (rt)
1329 dst_hold(&rt->u.dst);
1330 else if (rt6_need_strict(dest)) {
1331 while ((fn = fn->parent) != NULL) {
1332 if (fn->fn_flags & RTN_ROOT)
1333 break;
1334 if (fn->fn_flags & RTN_RTINFO)
1335 goto restart;
1336 }
1337 }
1338 read_unlock_bh(&table->tb6_lock);
1339
1340 if (!rt) {
1341 if (net_ratelimit())
1342 printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
1343 "for redirect target\n");
1344 return;
1345 }
1346
1347 /*
1348 * We have finally decided to accept it.
1349 */
1350
1351 neigh_update(neigh, lladdr, NUD_STALE,
1352 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1353 NEIGH_UPDATE_F_OVERRIDE|
1354 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1355 NEIGH_UPDATE_F_ISROUTER))
1356 );
1357
1358 /*
1359 * Redirect received -> path was valid.
1360 * Look, redirects are sent only in response to data packets,
1361 * so that this nexthop apparently is reachable. --ANK
1362 */
1363 dst_confirm(&rt->u.dst);
1364
1365 /* Duplicate redirect: silently ignore. */
1366 if (neigh == rt->u.dst.neighbour)
1367 goto out;
1368
1369 nrt = ip6_rt_copy(rt);
1370 if (nrt == NULL)
1371 goto out;
1372
1373 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1374 if (on_link)
1375 nrt->rt6i_flags &= ~RTF_GATEWAY;
1376
1377 ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
1378 nrt->rt6i_dst.plen = 128;
1379 nrt->u.dst.flags |= DST_HOST;
1380
1381 ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
1382 nrt->rt6i_nexthop = neigh_clone(neigh);
1383 /* Reset pmtu, it may be better */
1384 nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
1385 nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst));
1386
1387 if (ip6_ins_rt(nrt))
1388 goto out;
1389
1390 netevent.old = &rt->u.dst;
1391 netevent.new = &nrt->u.dst;
1392 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1393
1394 if (rt->rt6i_flags&RTF_CACHE) {
1395 ip6_del_rt(rt);
1396 return;
1397 }
1398
1399 out:
1400 dst_release(&rt->u.dst);
1401 return;
1402 }
1403
1404 /*
1405 * Handle ICMP "packet too big" messages
1406 * i.e. Path MTU discovery
1407 */
1408
1409 void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
1410 struct net_device *dev, u32 pmtu)
1411 {
1412 struct rt6_info *rt, *nrt;
1413 int allfrag = 0;
1414
1415 rt = rt6_lookup(daddr, saddr, dev->ifindex, 0);
1416 if (rt == NULL)
1417 return;
1418
1419 if (pmtu >= dst_mtu(&rt->u.dst))
1420 goto out;
1421
1422 if (pmtu < IPV6_MIN_MTU) {
1423 /*
1424 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
1425 * MTU (1280) and a fragment header should always be included
1426 * after a node receiving Too Big message reporting PMTU is
1427 * less than the IPv6 Minimum Link MTU.
1428 */
1429 pmtu = IPV6_MIN_MTU;
1430 allfrag = 1;
1431 }
1432
1433 /* New mtu received -> path was valid.
1434 They are sent only in response to data packets,
1435 so that this nexthop apparently is reachable. --ANK
1436 */
1437 dst_confirm(&rt->u.dst);
1438
1439 /* Host route. If it is static, it would be better
1440 not to override it, but add new one, so that
1441 when cache entry will expire old pmtu
1442 would return automatically.
1443 */
1444 if (rt->rt6i_flags & RTF_CACHE) {
1445 rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1446 if (allfrag)
1447 rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1448 dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires);
1449 rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
1450 goto out;
1451 }
1452
1453 /* Network route.
1454 Two cases are possible:
1455 1. It is connected route. Action: COW
1456 2. It is gatewayed route or NONEXTHOP route. Action: clone it.
1457 */
1458 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
1459 nrt = rt6_alloc_cow(rt, daddr, saddr);
1460 else
1461 nrt = rt6_alloc_clone(rt, daddr);
1462
1463 if (nrt) {
1464 nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1465 if (allfrag)
1466 nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1467
1468 /* According to RFC 1981, detecting PMTU increase shouldn't be
1469 * happened within 5 mins, the recommended timer is 10 mins.
1470 * Here this route expiration time is set to ip6_rt_mtu_expires
1471 * which is 10 mins. After 10 mins the decreased pmtu is expired
1472 * and detecting PMTU increase will be automatically happened.
1473 */
1474 dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
1475 nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
1476
1477 ip6_ins_rt(nrt);
1478 }
1479 out:
1480 dst_release(&rt->u.dst);
1481 }
1482
1483 /*
1484 * Misc support functions
1485 */
1486
1487 static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
1488 {
1489 struct rt6_info *rt = ip6_dst_alloc();
1490
1491 if (rt) {
1492 rt->u.dst.input = ort->u.dst.input;
1493 rt->u.dst.output = ort->u.dst.output;
1494
1495 memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
1496 rt->u.dst.dev = ort->u.dst.dev;
1497 if (rt->u.dst.dev)
1498 dev_hold(rt->u.dst.dev);
1499 rt->rt6i_idev = ort->rt6i_idev;
1500 if (rt->rt6i_idev)
1501 in6_dev_hold(rt->rt6i_idev);
1502 rt->u.dst.lastuse = jiffies;
1503 rt->rt6i_expires = 0;
1504
1505 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
1506 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
1507 rt->rt6i_metric = 0;
1508
1509 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1510 #ifdef CONFIG_IPV6_SUBTREES
1511 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1512 #endif
1513 rt->rt6i_table = ort->rt6i_table;
1514 }
1515 return rt;
1516 }
1517
1518 #ifdef CONFIG_IPV6_ROUTE_INFO
1519 static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
1520 struct in6_addr *gwaddr, int ifindex)
1521 {
1522 struct fib6_node *fn;
1523 struct rt6_info *rt = NULL;
1524 struct fib6_table *table;
1525
1526 table = fib6_get_table(RT6_TABLE_INFO);
1527 if (table == NULL)
1528 return NULL;
1529
1530 write_lock_bh(&table->tb6_lock);
1531 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1532 if (!fn)
1533 goto out;
1534
1535 for (rt = fn->leaf; rt; rt = rt->u.next) {
1536 if (rt->rt6i_dev->ifindex != ifindex)
1537 continue;
1538 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1539 continue;
1540 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1541 continue;
1542 dst_hold(&rt->u.dst);
1543 break;
1544 }
1545 out:
1546 write_unlock_bh(&table->tb6_lock);
1547 return rt;
1548 }
1549
1550 static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
1551 struct in6_addr *gwaddr, int ifindex,
1552 unsigned pref)
1553 {
1554 struct fib6_config cfg = {
1555 .fc_table = RT6_TABLE_INFO,
1556 .fc_metric = 1024,
1557 .fc_ifindex = ifindex,
1558 .fc_dst_len = prefixlen,
1559 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1560 RTF_UP | RTF_PREF(pref),
1561 };
1562
1563 ipv6_addr_copy(&cfg.fc_dst, prefix);
1564 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1565
1566 /* We should treat it as a default route if prefix length is 0. */
1567 if (!prefixlen)
1568 cfg.fc_flags |= RTF_DEFAULT;
1569
1570 ip6_route_add(&cfg);
1571
1572 return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex);
1573 }
1574 #endif
1575
1576 struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
1577 {
1578 struct rt6_info *rt;
1579 struct fib6_table *table;
1580
1581 table = fib6_get_table(RT6_TABLE_DFLT);
1582 if (table == NULL)
1583 return NULL;
1584
1585 write_lock_bh(&table->tb6_lock);
1586 for (rt = table->tb6_root.leaf; rt; rt=rt->u.next) {
1587 if (dev == rt->rt6i_dev &&
1588 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1589 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1590 break;
1591 }
1592 if (rt)
1593 dst_hold(&rt->u.dst);
1594 write_unlock_bh(&table->tb6_lock);
1595 return rt;
1596 }
1597
1598 struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1599 struct net_device *dev,
1600 unsigned int pref)
1601 {
1602 struct fib6_config cfg = {
1603 .fc_table = RT6_TABLE_DFLT,
1604 .fc_metric = 1024,
1605 .fc_ifindex = dev->ifindex,
1606 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1607 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1608 };
1609
1610 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1611
1612 ip6_route_add(&cfg);
1613
1614 return rt6_get_dflt_router(gwaddr, dev);
1615 }
1616
1617 void rt6_purge_dflt_routers(void)
1618 {
1619 struct rt6_info *rt;
1620 struct fib6_table *table;
1621
1622 /* NOTE: Keep consistent with rt6_get_dflt_router */
1623 table = fib6_get_table(RT6_TABLE_DFLT);
1624 if (table == NULL)
1625 return;
1626
1627 restart:
1628 read_lock_bh(&table->tb6_lock);
1629 for (rt = table->tb6_root.leaf; rt; rt = rt->u.next) {
1630 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
1631 dst_hold(&rt->u.dst);
1632 read_unlock_bh(&table->tb6_lock);
1633 ip6_del_rt(rt);
1634 goto restart;
1635 }
1636 }
1637 read_unlock_bh(&table->tb6_lock);
1638 }
1639
1640 static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg,
1641 struct fib6_config *cfg)
1642 {
1643 memset(cfg, 0, sizeof(*cfg));
1644
1645 cfg->fc_table = RT6_TABLE_MAIN;
1646 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1647 cfg->fc_metric = rtmsg->rtmsg_metric;
1648 cfg->fc_expires = rtmsg->rtmsg_info;
1649 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1650 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1651 cfg->fc_flags = rtmsg->rtmsg_flags;
1652
1653 ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst);
1654 ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src);
1655 ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway);
1656 }
1657
1658 int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
1659 {
1660 struct fib6_config cfg;
1661 struct in6_rtmsg rtmsg;
1662 int err;
1663
1664 switch(cmd) {
1665 case SIOCADDRT: /* Add a route */
1666 case SIOCDELRT: /* Delete a route */
1667 if (!capable(CAP_NET_ADMIN))
1668 return -EPERM;
1669 err = copy_from_user(&rtmsg, arg,
1670 sizeof(struct in6_rtmsg));
1671 if (err)
1672 return -EFAULT;
1673
1674 rtmsg_to_fib6_config(&rtmsg, &cfg);
1675
1676 rtnl_lock();
1677 switch (cmd) {
1678 case SIOCADDRT:
1679 err = ip6_route_add(&cfg);
1680 break;
1681 case SIOCDELRT:
1682 err = ip6_route_del(&cfg);
1683 break;
1684 default:
1685 err = -EINVAL;
1686 }
1687 rtnl_unlock();
1688
1689 return err;
1690 };
1691
1692 return -EINVAL;
1693 }
1694
1695 /*
1696 * Drop the packet on the floor
1697 */
1698
1699 static int ip6_pkt_discard(struct sk_buff *skb)
1700 {
1701 int type = ipv6_addr_type(&skb->nh.ipv6h->daddr);
1702 if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED)
1703 IP6_INC_STATS(IPSTATS_MIB_INADDRERRORS);
1704
1705 IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
1706 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev);
1707 kfree_skb(skb);
1708 return 0;
1709 }
1710
1711 static int ip6_pkt_discard_out(struct sk_buff *skb)
1712 {
1713 skb->dev = skb->dst->dev;
1714 return ip6_pkt_discard(skb);
1715 }
1716
1717 /*
1718 * Allocate a dst for local (unicast / anycast) address.
1719 */
1720
1721 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
1722 const struct in6_addr *addr,
1723 int anycast)
1724 {
1725 struct rt6_info *rt = ip6_dst_alloc();
1726
1727 if (rt == NULL)
1728 return ERR_PTR(-ENOMEM);
1729
1730 dev_hold(&loopback_dev);
1731 in6_dev_hold(idev);
1732
1733 rt->u.dst.flags = DST_HOST;
1734 rt->u.dst.input = ip6_input;
1735 rt->u.dst.output = ip6_output;
1736 rt->rt6i_dev = &loopback_dev;
1737 rt->rt6i_idev = idev;
1738 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
1739 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
1740 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1741 rt->u.dst.obsolete = -1;
1742
1743 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
1744 if (anycast)
1745 rt->rt6i_flags |= RTF_ANYCAST;
1746 else
1747 rt->rt6i_flags |= RTF_LOCAL;
1748 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
1749 if (rt->rt6i_nexthop == NULL) {
1750 dst_free((struct dst_entry *) rt);
1751 return ERR_PTR(-ENOMEM);
1752 }
1753
1754 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
1755 rt->rt6i_dst.plen = 128;
1756 rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL);
1757
1758 atomic_set(&rt->u.dst.__refcnt, 1);
1759
1760 return rt;
1761 }
1762
1763 static int fib6_ifdown(struct rt6_info *rt, void *arg)
1764 {
1765 if (((void*)rt->rt6i_dev == arg || arg == NULL) &&
1766 rt != &ip6_null_entry) {
1767 RT6_TRACE("deleted by ifdown %p\n", rt);
1768 return -1;
1769 }
1770 return 0;
1771 }
1772
1773 void rt6_ifdown(struct net_device *dev)
1774 {
1775 fib6_clean_all(fib6_ifdown, 0, dev);
1776 }
1777
1778 struct rt6_mtu_change_arg
1779 {
1780 struct net_device *dev;
1781 unsigned mtu;
1782 };
1783
1784 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
1785 {
1786 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
1787 struct inet6_dev *idev;
1788
1789 /* In IPv6 pmtu discovery is not optional,
1790 so that RTAX_MTU lock cannot disable it.
1791 We still use this lock to block changes
1792 caused by addrconf/ndisc.
1793 */
1794
1795 idev = __in6_dev_get(arg->dev);
1796 if (idev == NULL)
1797 return 0;
1798
1799 /* For administrative MTU increase, there is no way to discover
1800 IPv6 PMTU increase, so PMTU increase should be updated here.
1801 Since RFC 1981 doesn't include administrative MTU increase
1802 update PMTU increase is a MUST. (i.e. jumbo frame)
1803 */
1804 /*
1805 If new MTU is less than route PMTU, this new MTU will be the
1806 lowest MTU in the path, update the route PMTU to reflect PMTU
1807 decreases; if new MTU is greater than route PMTU, and the
1808 old MTU is the lowest MTU in the path, update the route PMTU
1809 to reflect the increase. In this case if the other nodes' MTU
1810 also have the lowest MTU, TOO BIG MESSAGE will be lead to
1811 PMTU discouvery.
1812 */
1813 if (rt->rt6i_dev == arg->dev &&
1814 !dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
1815 (dst_mtu(&rt->u.dst) > arg->mtu ||
1816 (dst_mtu(&rt->u.dst) < arg->mtu &&
1817 dst_mtu(&rt->u.dst) == idev->cnf.mtu6)))
1818 rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
1819 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
1820 return 0;
1821 }
1822
1823 void rt6_mtu_change(struct net_device *dev, unsigned mtu)
1824 {
1825 struct rt6_mtu_change_arg arg = {
1826 .dev = dev,
1827 .mtu = mtu,
1828 };
1829
1830 fib6_clean_all(rt6_mtu_change_route, 0, &arg);
1831 }
1832
1833 static struct nla_policy rtm_ipv6_policy[RTA_MAX+1] __read_mostly = {
1834 [RTA_GATEWAY] = { .minlen = sizeof(struct in6_addr) },
1835 [RTA_OIF] = { .type = NLA_U32 },
1836 [RTA_PRIORITY] = { .type = NLA_U32 },
1837 [RTA_METRICS] = { .type = NLA_NESTED },
1838 };
1839
1840 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
1841 struct fib6_config *cfg)
1842 {
1843 struct rtmsg *rtm;
1844 struct nlattr *tb[RTA_MAX+1];
1845 int err;
1846
1847 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
1848 if (err < 0)
1849 goto errout;
1850
1851 err = -EINVAL;
1852 rtm = nlmsg_data(nlh);
1853 memset(cfg, 0, sizeof(*cfg));
1854
1855 cfg->fc_table = rtm->rtm_table;
1856 cfg->fc_dst_len = rtm->rtm_dst_len;
1857 cfg->fc_src_len = rtm->rtm_src_len;
1858 cfg->fc_flags = RTF_UP;
1859 cfg->fc_protocol = rtm->rtm_protocol;
1860
1861 if (rtm->rtm_type == RTN_UNREACHABLE)
1862 cfg->fc_flags |= RTF_REJECT;
1863
1864 cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
1865 cfg->fc_nlinfo.nlh = nlh;
1866
1867 if (tb[RTA_GATEWAY]) {
1868 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
1869 cfg->fc_flags |= RTF_GATEWAY;
1870 }
1871
1872 if (tb[RTA_DST]) {
1873 int plen = (rtm->rtm_dst_len + 7) >> 3;
1874
1875 if (nla_len(tb[RTA_DST]) < plen)
1876 goto errout;
1877
1878 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1879 }
1880
1881 if (tb[RTA_SRC]) {
1882 int plen = (rtm->rtm_src_len + 7) >> 3;
1883
1884 if (nla_len(tb[RTA_SRC]) < plen)
1885 goto errout;
1886
1887 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1888 }
1889
1890 if (tb[RTA_OIF])
1891 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
1892
1893 if (tb[RTA_PRIORITY])
1894 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
1895
1896 if (tb[RTA_METRICS]) {
1897 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
1898 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
1899 }
1900
1901 if (tb[RTA_TABLE])
1902 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
1903
1904 err = 0;
1905 errout:
1906 return err;
1907 }
1908
1909 int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1910 {
1911 struct fib6_config cfg;
1912 int err;
1913
1914 err = rtm_to_fib6_config(skb, nlh, &cfg);
1915 if (err < 0)
1916 return err;
1917
1918 return ip6_route_del(&cfg);
1919 }
1920
1921 int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1922 {
1923 struct fib6_config cfg;
1924 int err;
1925
1926 err = rtm_to_fib6_config(skb, nlh, &cfg);
1927 if (err < 0)
1928 return err;
1929
1930 return ip6_route_add(&cfg);
1931 }
1932
1933 static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
1934 struct in6_addr *dst, struct in6_addr *src,
1935 int iif, int type, u32 pid, u32 seq,
1936 int prefix, unsigned int flags)
1937 {
1938 struct rtmsg *rtm;
1939 struct nlmsghdr *nlh;
1940 unsigned char *b = skb->tail;
1941 struct rta_cacheinfo ci;
1942 u32 table;
1943
1944 if (prefix) { /* user wants prefix routes only */
1945 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
1946 /* success since this is not a prefix route */
1947 return 1;
1948 }
1949 }
1950
1951 nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*rtm), flags);
1952 rtm = NLMSG_DATA(nlh);
1953 rtm->rtm_family = AF_INET6;
1954 rtm->rtm_dst_len = rt->rt6i_dst.plen;
1955 rtm->rtm_src_len = rt->rt6i_src.plen;
1956 rtm->rtm_tos = 0;
1957 if (rt->rt6i_table)
1958 table = rt->rt6i_table->tb6_id;
1959 else
1960 table = RT6_TABLE_UNSPEC;
1961 rtm->rtm_table = table;
1962 RTA_PUT_U32(skb, RTA_TABLE, table);
1963 if (rt->rt6i_flags&RTF_REJECT)
1964 rtm->rtm_type = RTN_UNREACHABLE;
1965 else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
1966 rtm->rtm_type = RTN_LOCAL;
1967 else
1968 rtm->rtm_type = RTN_UNICAST;
1969 rtm->rtm_flags = 0;
1970 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
1971 rtm->rtm_protocol = rt->rt6i_protocol;
1972 if (rt->rt6i_flags&RTF_DYNAMIC)
1973 rtm->rtm_protocol = RTPROT_REDIRECT;
1974 else if (rt->rt6i_flags & RTF_ADDRCONF)
1975 rtm->rtm_protocol = RTPROT_KERNEL;
1976 else if (rt->rt6i_flags&RTF_DEFAULT)
1977 rtm->rtm_protocol = RTPROT_RA;
1978
1979 if (rt->rt6i_flags&RTF_CACHE)
1980 rtm->rtm_flags |= RTM_F_CLONED;
1981
1982 if (dst) {
1983 RTA_PUT(skb, RTA_DST, 16, dst);
1984 rtm->rtm_dst_len = 128;
1985 } else if (rtm->rtm_dst_len)
1986 RTA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
1987 #ifdef CONFIG_IPV6_SUBTREES
1988 if (src) {
1989 RTA_PUT(skb, RTA_SRC, 16, src);
1990 rtm->rtm_src_len = 128;
1991 } else if (rtm->rtm_src_len)
1992 RTA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
1993 #endif
1994 if (iif)
1995 RTA_PUT(skb, RTA_IIF, 4, &iif);
1996 else if (dst) {
1997 struct in6_addr saddr_buf;
1998 if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
1999 RTA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
2000 }
2001 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
2002 goto rtattr_failure;
2003 if (rt->u.dst.neighbour)
2004 RTA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);
2005 if (rt->u.dst.dev)
2006 RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->rt6i_dev->ifindex);
2007 RTA_PUT(skb, RTA_PRIORITY, 4, &rt->rt6i_metric);
2008 ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse);
2009 if (rt->rt6i_expires)
2010 ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies);
2011 else
2012 ci.rta_expires = 0;
2013 ci.rta_used = rt->u.dst.__use;
2014 ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt);
2015 ci.rta_error = rt->u.dst.error;
2016 ci.rta_id = 0;
2017 ci.rta_ts = 0;
2018 ci.rta_tsage = 0;
2019 RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci);
2020 nlh->nlmsg_len = skb->tail - b;
2021 return skb->len;
2022
2023 nlmsg_failure:
2024 rtattr_failure:
2025 skb_trim(skb, b - skb->data);
2026 return -1;
2027 }
2028
2029 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2030 {
2031 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2032 int prefix;
2033
2034 if (arg->cb->nlh->nlmsg_len >= NLMSG_LENGTH(sizeof(struct rtmsg))) {
2035 struct rtmsg *rtm = NLMSG_DATA(arg->cb->nlh);
2036 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2037 } else
2038 prefix = 0;
2039
2040 return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2041 NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
2042 prefix, NLM_F_MULTI);
2043 }
2044
2045 int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
2046 {
2047 struct rtattr **rta = arg;
2048 int iif = 0;
2049 int err = -ENOBUFS;
2050 struct sk_buff *skb;
2051 struct flowi fl;
2052 struct rt6_info *rt;
2053
2054 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2055 if (skb == NULL)
2056 goto out;
2057
2058 /* Reserve room for dummy headers, this skb can pass
2059 through good chunk of routing engine.
2060 */
2061 skb->mac.raw = skb->data;
2062 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2063
2064 memset(&fl, 0, sizeof(fl));
2065 if (rta[RTA_SRC-1])
2066 ipv6_addr_copy(&fl.fl6_src,
2067 (struct in6_addr*)RTA_DATA(rta[RTA_SRC-1]));
2068 if (rta[RTA_DST-1])
2069 ipv6_addr_copy(&fl.fl6_dst,
2070 (struct in6_addr*)RTA_DATA(rta[RTA_DST-1]));
2071
2072 if (rta[RTA_IIF-1])
2073 memcpy(&iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
2074
2075 if (iif) {
2076 struct net_device *dev;
2077 dev = __dev_get_by_index(iif);
2078 if (!dev) {
2079 err = -ENODEV;
2080 goto out_free;
2081 }
2082 }
2083
2084 fl.oif = 0;
2085 if (rta[RTA_OIF-1])
2086 memcpy(&fl.oif, RTA_DATA(rta[RTA_OIF-1]), sizeof(int));
2087
2088 rt = (struct rt6_info*)ip6_route_output(NULL, &fl);
2089
2090 skb->dst = &rt->u.dst;
2091
2092 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
2093 err = rt6_fill_node(skb, rt,
2094 &fl.fl6_dst, &fl.fl6_src,
2095 iif,
2096 RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2097 nlh->nlmsg_seq, 0, 0);
2098 if (err < 0) {
2099 err = -EMSGSIZE;
2100 goto out_free;
2101 }
2102
2103 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
2104 out:
2105 return err;
2106 out_free:
2107 kfree_skb(skb);
2108 goto out;
2109 }
2110
2111 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2112 {
2113 struct sk_buff *skb;
2114 u32 pid = 0, seq = 0;
2115 struct nlmsghdr *nlh = NULL;
2116 int payload = sizeof(struct rtmsg) + 256;
2117 int err = -ENOBUFS;
2118
2119 if (info) {
2120 pid = info->pid;
2121 nlh = info->nlh;
2122 if (nlh)
2123 seq = nlh->nlmsg_seq;
2124 }
2125
2126 skb = nlmsg_new(nlmsg_total_size(payload), gfp_any());
2127 if (skb == NULL)
2128 goto errout;
2129
2130 err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0);
2131 if (err < 0) {
2132 kfree_skb(skb);
2133 goto errout;
2134 }
2135
2136 err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any());
2137 errout:
2138 if (err < 0)
2139 rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err);
2140 }
2141
2142 /*
2143 * /proc
2144 */
2145
2146 #ifdef CONFIG_PROC_FS
2147
2148 #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1)
2149
2150 struct rt6_proc_arg
2151 {
2152 char *buffer;
2153 int offset;
2154 int length;
2155 int skip;
2156 int len;
2157 };
2158
2159 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2160 {
2161 struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg;
2162 int i;
2163
2164 if (arg->skip < arg->offset / RT6_INFO_LEN) {
2165 arg->skip++;
2166 return 0;
2167 }
2168
2169 if (arg->len >= arg->length)
2170 return 0;
2171
2172 for (i=0; i<16; i++) {
2173 sprintf(arg->buffer + arg->len, "%02x",
2174 rt->rt6i_dst.addr.s6_addr[i]);
2175 arg->len += 2;
2176 }
2177 arg->len += sprintf(arg->buffer + arg->len, " %02x ",
2178 rt->rt6i_dst.plen);
2179
2180 #ifdef CONFIG_IPV6_SUBTREES
2181 for (i=0; i<16; i++) {
2182 sprintf(arg->buffer + arg->len, "%02x",
2183 rt->rt6i_src.addr.s6_addr[i]);
2184 arg->len += 2;
2185 }
2186 arg->len += sprintf(arg->buffer + arg->len, " %02x ",
2187 rt->rt6i_src.plen);
2188 #else
2189 sprintf(arg->buffer + arg->len,
2190 "00000000000000000000000000000000 00 ");
2191 arg->len += 36;
2192 #endif
2193
2194 if (rt->rt6i_nexthop) {
2195 for (i=0; i<16; i++) {
2196 sprintf(arg->buffer + arg->len, "%02x",
2197 rt->rt6i_nexthop->primary_key[i]);
2198 arg->len += 2;
2199 }
2200 } else {
2201 sprintf(arg->buffer + arg->len,
2202 "00000000000000000000000000000000");
2203 arg->len += 32;
2204 }
2205 arg->len += sprintf(arg->buffer + arg->len,
2206 " %08x %08x %08x %08x %8s\n",
2207 rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
2208 rt->u.dst.__use, rt->rt6i_flags,
2209 rt->rt6i_dev ? rt->rt6i_dev->name : "");
2210 return 0;
2211 }
2212
2213 static int rt6_proc_info(char *buffer, char **start, off_t offset, int length)
2214 {
2215 struct rt6_proc_arg arg = {
2216 .buffer = buffer,
2217 .offset = offset,
2218 .length = length,
2219 };
2220
2221 fib6_clean_all(rt6_info_route, 0, &arg);
2222
2223 *start = buffer;
2224 if (offset)
2225 *start += offset % RT6_INFO_LEN;
2226
2227 arg.len -= offset % RT6_INFO_LEN;
2228
2229 if (arg.len > length)
2230 arg.len = length;
2231 if (arg.len < 0)
2232 arg.len = 0;
2233
2234 return arg.len;
2235 }
2236
2237 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2238 {
2239 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2240 rt6_stats.fib_nodes, rt6_stats.fib_route_nodes,
2241 rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries,
2242 rt6_stats.fib_rt_cache,
2243 atomic_read(&ip6_dst_ops.entries),
2244 rt6_stats.fib_discarded_routes);
2245
2246 return 0;
2247 }
2248
2249 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2250 {
2251 return single_open(file, rt6_stats_seq_show, NULL);
2252 }
2253
2254 static struct file_operations rt6_stats_seq_fops = {
2255 .owner = THIS_MODULE,
2256 .open = rt6_stats_seq_open,
2257 .read = seq_read,
2258 .llseek = seq_lseek,
2259 .release = single_release,
2260 };
2261 #endif /* CONFIG_PROC_FS */
2262
2263 #ifdef CONFIG_SYSCTL
2264
2265 static int flush_delay;
2266
2267 static
2268 int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
2269 void __user *buffer, size_t *lenp, loff_t *ppos)
2270 {
2271 if (write) {
2272 proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
2273 fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay);
2274 return 0;
2275 } else
2276 return -EINVAL;
2277 }
2278
2279 ctl_table ipv6_route_table[] = {
2280 {
2281 .ctl_name = NET_IPV6_ROUTE_FLUSH,
2282 .procname = "flush",
2283 .data = &flush_delay,
2284 .maxlen = sizeof(int),
2285 .mode = 0200,
2286 .proc_handler = &ipv6_sysctl_rtcache_flush
2287 },
2288 {
2289 .ctl_name = NET_IPV6_ROUTE_GC_THRESH,
2290 .procname = "gc_thresh",
2291 .data = &ip6_dst_ops.gc_thresh,
2292 .maxlen = sizeof(int),
2293 .mode = 0644,
2294 .proc_handler = &proc_dointvec,
2295 },
2296 {
2297 .ctl_name = NET_IPV6_ROUTE_MAX_SIZE,
2298 .procname = "max_size",
2299 .data = &ip6_rt_max_size,
2300 .maxlen = sizeof(int),
2301 .mode = 0644,
2302 .proc_handler = &proc_dointvec,
2303 },
2304 {
2305 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL,
2306 .procname = "gc_min_interval",
2307 .data = &ip6_rt_gc_min_interval,
2308 .maxlen = sizeof(int),
2309 .mode = 0644,
2310 .proc_handler = &proc_dointvec_jiffies,
2311 .strategy = &sysctl_jiffies,
2312 },
2313 {
2314 .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT,
2315 .procname = "gc_timeout",
2316 .data = &ip6_rt_gc_timeout,
2317 .maxlen = sizeof(int),
2318 .mode = 0644,
2319 .proc_handler = &proc_dointvec_jiffies,
2320 .strategy = &sysctl_jiffies,
2321 },
2322 {
2323 .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL,
2324 .procname = "gc_interval",
2325 .data = &ip6_rt_gc_interval,
2326 .maxlen = sizeof(int),
2327 .mode = 0644,
2328 .proc_handler = &proc_dointvec_jiffies,
2329 .strategy = &sysctl_jiffies,
2330 },
2331 {
2332 .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY,
2333 .procname = "gc_elasticity",
2334 .data = &ip6_rt_gc_elasticity,
2335 .maxlen = sizeof(int),
2336 .mode = 0644,
2337 .proc_handler = &proc_dointvec_jiffies,
2338 .strategy = &sysctl_jiffies,
2339 },
2340 {
2341 .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES,
2342 .procname = "mtu_expires",
2343 .data = &ip6_rt_mtu_expires,
2344 .maxlen = sizeof(int),
2345 .mode = 0644,
2346 .proc_handler = &proc_dointvec_jiffies,
2347 .strategy = &sysctl_jiffies,
2348 },
2349 {
2350 .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS,
2351 .procname = "min_adv_mss",
2352 .data = &ip6_rt_min_advmss,
2353 .maxlen = sizeof(int),
2354 .mode = 0644,
2355 .proc_handler = &proc_dointvec_jiffies,
2356 .strategy = &sysctl_jiffies,
2357 },
2358 {
2359 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
2360 .procname = "gc_min_interval_ms",
2361 .data = &ip6_rt_gc_min_interval,
2362 .maxlen = sizeof(int),
2363 .mode = 0644,
2364 .proc_handler = &proc_dointvec_ms_jiffies,
2365 .strategy = &sysctl_ms_jiffies,
2366 },
2367 { .ctl_name = 0 }
2368 };
2369
2370 #endif
2371
2372 void __init ip6_route_init(void)
2373 {
2374 struct proc_dir_entry *p;
2375
2376 ip6_dst_ops.kmem_cachep = kmem_cache_create("ip6_dst_cache",
2377 sizeof(struct rt6_info),
2378 0, SLAB_HWCACHE_ALIGN,
2379 NULL, NULL);
2380 if (!ip6_dst_ops.kmem_cachep)
2381 panic("cannot create ip6_dst_cache");
2382
2383 fib6_init();
2384 #ifdef CONFIG_PROC_FS
2385 p = proc_net_create("ipv6_route", 0, rt6_proc_info);
2386 if (p)
2387 p->owner = THIS_MODULE;
2388
2389 proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
2390 #endif
2391 #ifdef CONFIG_XFRM
2392 xfrm6_init();
2393 #endif
2394 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2395 fib6_rules_init();
2396 #endif
2397 }
2398
2399 void ip6_route_cleanup(void)
2400 {
2401 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2402 fib6_rules_cleanup();
2403 #endif
2404 #ifdef CONFIG_PROC_FS
2405 proc_net_remove("ipv6_route");
2406 proc_net_remove("rt6_stats");
2407 #endif
2408 #ifdef CONFIG_XFRM
2409 xfrm6_fini();
2410 #endif
2411 rt6_ifdown(NULL);
2412 fib6_gc_cleanup();
2413 kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
2414 }
kernel source for telekom puls (alcatel/mediatek)