projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
[SK_BUFF]: Introduce ipv6_hdr(), remove skb->nh.ipv6h
[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 * Ville Nuorvala
26 * Fixed routing subtrees.
27 */
28
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/times.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/net.h>
36 #include <linux/route.h>
37 #include <linux/netdevice.h>
38 #include <linux/in6.h>
39 #include <linux/init.h>
40 #include <linux/if_arp.h>
41
42 #ifdef CONFIG_PROC_FS
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #endif
46
47 #include <net/snmp.h>
48 #include <net/ipv6.h>
49 #include <net/ip6_fib.h>
50 #include <net/ip6_route.h>
51 #include <net/ndisc.h>
52 #include <net/addrconf.h>
53 #include <net/tcp.h>
54 #include <linux/rtnetlink.h>
55 #include <net/dst.h>
56 #include <net/xfrm.h>
57 #include <net/netevent.h>
58 #include <net/netlink.h>
59
60 #include <asm/uaccess.h>
61
62 #ifdef CONFIG_SYSCTL
63 #include <linux/sysctl.h>
64 #endif
65
66 /* Set to 3 to get tracing. */
67 #define RT6_DEBUG 2
68
69 #if RT6_DEBUG >= 3
70 #define RDBG(x) printk x
71 #define RT6_TRACE(x...) printk(KERN_DEBUG x)
72 #else
73 #define RDBG(x)
74 #define RT6_TRACE(x...) do { ; } while (0)
75 #endif
76
77 #define CLONE_OFFLINK_ROUTE 0
78
79 static int ip6_rt_max_size = 4096;
80 static int ip6_rt_gc_min_interval = HZ / 2;
81 static int ip6_rt_gc_timeout = 60*HZ;
82 int ip6_rt_gc_interval = 30*HZ;
83 static int ip6_rt_gc_elasticity = 9;
84 static int ip6_rt_mtu_expires = 10*60*HZ;
85 static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
86
87 static struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
88 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
89 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
90 static void ip6_dst_destroy(struct dst_entry *);
91 static void ip6_dst_ifdown(struct dst_entry *,
92 struct net_device *dev, int how);
93 static int ip6_dst_gc(void);
94
95 static int ip6_pkt_discard(struct sk_buff *skb);
96 static int ip6_pkt_discard_out(struct sk_buff *skb);
97 static void ip6_link_failure(struct sk_buff *skb);
98 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
99
100 #ifdef CONFIG_IPV6_ROUTE_INFO
101 static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
102 struct in6_addr *gwaddr, int ifindex,
103 unsigned pref);
104 static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
105 struct in6_addr *gwaddr, int ifindex);
106 #endif
107
108 static struct dst_ops ip6_dst_ops = {
109 .family = AF_INET6,
110 .protocol = __constant_htons(ETH_P_IPV6),
111 .gc = ip6_dst_gc,
112 .gc_thresh = 1024,
113 .check = ip6_dst_check,
114 .destroy = ip6_dst_destroy,
115 .ifdown = ip6_dst_ifdown,
116 .negative_advice = ip6_negative_advice,
117 .link_failure = ip6_link_failure,
118 .update_pmtu = ip6_rt_update_pmtu,
119 .entry_size = sizeof(struct rt6_info),
120 };
121
122 struct rt6_info ip6_null_entry = {
123 .u = {
124 .dst = {
125 .__refcnt = ATOMIC_INIT(1),
126 .__use = 1,
127 .dev = &loopback_dev,
128 .obsolete = -1,
129 .error = -ENETUNREACH,
130 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
131 .input = ip6_pkt_discard,
132 .output = ip6_pkt_discard_out,
133 .ops = &ip6_dst_ops,
134 .path = (struct dst_entry*)&ip6_null_entry,
135 }
136 },
137 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
138 .rt6i_metric = ~(u32) 0,
139 .rt6i_ref = ATOMIC_INIT(1),
140 };
141
142 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
143
144 static int ip6_pkt_prohibit(struct sk_buff *skb);
145 static int ip6_pkt_prohibit_out(struct sk_buff *skb);
146 static int ip6_pkt_blk_hole(struct sk_buff *skb);
147
148 struct rt6_info ip6_prohibit_entry = {
149 .u = {
150 .dst = {
151 .__refcnt = ATOMIC_INIT(1),
152 .__use = 1,
153 .dev = &loopback_dev,
154 .obsolete = -1,
155 .error = -EACCES,
156 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
157 .input = ip6_pkt_prohibit,
158 .output = ip6_pkt_prohibit_out,
159 .ops = &ip6_dst_ops,
160 .path = (struct dst_entry*)&ip6_prohibit_entry,
161 }
162 },
163 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
164 .rt6i_metric = ~(u32) 0,
165 .rt6i_ref = ATOMIC_INIT(1),
166 };
167
168 struct rt6_info ip6_blk_hole_entry = {
169 .u = {
170 .dst = {
171 .__refcnt = ATOMIC_INIT(1),
172 .__use = 1,
173 .dev = &loopback_dev,
174 .obsolete = -1,
175 .error = -EINVAL,
176 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
177 .input = ip6_pkt_blk_hole,
178 .output = ip6_pkt_blk_hole,
179 .ops = &ip6_dst_ops,
180 .path = (struct dst_entry*)&ip6_blk_hole_entry,
181 }
182 },
183 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
184 .rt6i_metric = ~(u32) 0,
185 .rt6i_ref = ATOMIC_INIT(1),
186 };
187
188 #endif
189
190 /* allocate dst with ip6_dst_ops */
191 static __inline__ struct rt6_info *ip6_dst_alloc(void)
192 {
193 return (struct rt6_info *)dst_alloc(&ip6_dst_ops);
194 }
195
196 static void ip6_dst_destroy(struct dst_entry *dst)
197 {
198 struct rt6_info *rt = (struct rt6_info *)dst;
199 struct inet6_dev *idev = rt->rt6i_idev;
200
201 if (idev != NULL) {
202 rt->rt6i_idev = NULL;
203 in6_dev_put(idev);
204 }
205 }
206
207 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
208 int how)
209 {
210 struct rt6_info *rt = (struct rt6_info *)dst;
211 struct inet6_dev *idev = rt->rt6i_idev;
212
213 if (dev != &loopback_dev && idev != NULL && idev->dev == dev) {
214 struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
215 if (loopback_idev != NULL) {
216 rt->rt6i_idev = loopback_idev;
217 in6_dev_put(idev);
218 }
219 }
220 }
221
222 static __inline__ int rt6_check_expired(const struct rt6_info *rt)
223 {
224 return (rt->rt6i_flags & RTF_EXPIRES &&
225 time_after(jiffies, rt->rt6i_expires));
226 }
227
228 static inline int rt6_need_strict(struct in6_addr *daddr)
229 {
230 return (ipv6_addr_type(daddr) &
231 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
232 }
233
234 /*
235 * Route lookup. Any table->tb6_lock is implied.
236 */
237
238 static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt,
239 int oif,
240 int strict)
241 {
242 struct rt6_info *local = NULL;
243 struct rt6_info *sprt;
244
245 if (oif) {
246 for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) {
247 struct net_device *dev = sprt->rt6i_dev;
248 if (dev->ifindex == oif)
249 return sprt;
250 if (dev->flags & IFF_LOOPBACK) {
251 if (sprt->rt6i_idev == NULL ||
252 sprt->rt6i_idev->dev->ifindex != oif) {
253 if (strict && oif)
254 continue;
255 if (local && (!oif ||
256 local->rt6i_idev->dev->ifindex == oif))
257 continue;
258 }
259 local = sprt;
260 }
261 }
262
263 if (local)
264 return local;
265
266 if (strict)
267 return &ip6_null_entry;
268 }
269 return rt;
270 }
271
272 #ifdef CONFIG_IPV6_ROUTER_PREF
273 static void rt6_probe(struct rt6_info *rt)
274 {
275 struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL;
276 /*
277 * Okay, this does not seem to be appropriate
278 * for now, however, we need to check if it
279 * is really so; aka Router Reachability Probing.
280 *
281 * Router Reachability Probe MUST be rate-limited
282 * to no more than one per minute.
283 */
284 if (!neigh || (neigh->nud_state & NUD_VALID))
285 return;
286 read_lock_bh(&neigh->lock);
287 if (!(neigh->nud_state & NUD_VALID) &&
288 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
289 struct in6_addr mcaddr;
290 struct in6_addr *target;
291
292 neigh->updated = jiffies;
293 read_unlock_bh(&neigh->lock);
294
295 target = (struct in6_addr *)&neigh->primary_key;
296 addrconf_addr_solict_mult(target, &mcaddr);
297 ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL);
298 } else
299 read_unlock_bh(&neigh->lock);
300 }
301 #else
302 static inline void rt6_probe(struct rt6_info *rt)
303 {
304 return;
305 }
306 #endif
307
308 /*
309 * Default Router Selection (RFC 2461 6.3.6)
310 */
311 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
312 {
313 struct net_device *dev = rt->rt6i_dev;
314 if (!oif || dev->ifindex == oif)
315 return 2;
316 if ((dev->flags & IFF_LOOPBACK) &&
317 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
318 return 1;
319 return 0;
320 }
321
322 static inline int rt6_check_neigh(struct rt6_info *rt)
323 {
324 struct neighbour *neigh = rt->rt6i_nexthop;
325 int m = 0;
326 if (rt->rt6i_flags & RTF_NONEXTHOP ||
327 !(rt->rt6i_flags & RTF_GATEWAY))
328 m = 1;
329 else if (neigh) {
330 read_lock_bh(&neigh->lock);
331 if (neigh->nud_state & NUD_VALID)
332 m = 2;
333 else if (!(neigh->nud_state & NUD_FAILED))
334 m = 1;
335 read_unlock_bh(&neigh->lock);
336 }
337 return m;
338 }
339
340 static int rt6_score_route(struct rt6_info *rt, int oif,
341 int strict)
342 {
343 int m, n;
344
345 m = rt6_check_dev(rt, oif);
346 if (!m && (strict & RT6_LOOKUP_F_IFACE))
347 return -1;
348 #ifdef CONFIG_IPV6_ROUTER_PREF
349 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
350 #endif
351 n = rt6_check_neigh(rt);
352 if (!n && (strict & RT6_LOOKUP_F_REACHABLE))
353 return -1;
354 return m;
355 }
356
357 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
358 int *mpri, struct rt6_info *match)
359 {
360 int m;
361
362 if (rt6_check_expired(rt))
363 goto out;
364
365 m = rt6_score_route(rt, oif, strict);
366 if (m < 0)
367 goto out;
368
369 if (m > *mpri) {
370 if (strict & RT6_LOOKUP_F_REACHABLE)
371 rt6_probe(match);
372 *mpri = m;
373 match = rt;
374 } else if (strict & RT6_LOOKUP_F_REACHABLE) {
375 rt6_probe(rt);
376 }
377
378 out:
379 return match;
380 }
381
382 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
383 struct rt6_info *rr_head,
384 u32 metric, int oif, int strict)
385 {
386 struct rt6_info *rt, *match;
387 int mpri = -1;
388
389 match = NULL;
390 for (rt = rr_head; rt && rt->rt6i_metric == metric;
391 rt = rt->u.dst.rt6_next)
392 match = find_match(rt, oif, strict, &mpri, match);
393 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
394 rt = rt->u.dst.rt6_next)
395 match = find_match(rt, oif, strict, &mpri, match);
396
397 return match;
398 }
399
400 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
401 {
402 struct rt6_info *match, *rt0;
403
404 RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n",
405 __FUNCTION__, fn->leaf, oif);
406
407 rt0 = fn->rr_ptr;
408 if (!rt0)
409 fn->rr_ptr = rt0 = fn->leaf;
410
411 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict);
412
413 if (!match &&
414 (strict & RT6_LOOKUP_F_REACHABLE)) {
415 struct rt6_info *next = rt0->u.dst.rt6_next;
416
417 /* no entries matched; do round-robin */
418 if (!next || next->rt6i_metric != rt0->rt6i_metric)
419 next = fn->leaf;
420
421 if (next != rt0)
422 fn->rr_ptr = next;
423 }
424
425 RT6_TRACE("%s() => %p\n",
426 __FUNCTION__, match);
427
428 return (match ? match : &ip6_null_entry);
429 }
430
431 #ifdef CONFIG_IPV6_ROUTE_INFO
432 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
433 struct in6_addr *gwaddr)
434 {
435 struct route_info *rinfo = (struct route_info *) opt;
436 struct in6_addr prefix_buf, *prefix;
437 unsigned int pref;
438 u32 lifetime;
439 struct rt6_info *rt;
440
441 if (len < sizeof(struct route_info)) {
442 return -EINVAL;
443 }
444
445 /* Sanity check for prefix_len and length */
446 if (rinfo->length > 3) {
447 return -EINVAL;
448 } else if (rinfo->prefix_len > 128) {
449 return -EINVAL;
450 } else if (rinfo->prefix_len > 64) {
451 if (rinfo->length < 2) {
452 return -EINVAL;
453 }
454 } else if (rinfo->prefix_len > 0) {
455 if (rinfo->length < 1) {
456 return -EINVAL;
457 }
458 }
459
460 pref = rinfo->route_pref;
461 if (pref == ICMPV6_ROUTER_PREF_INVALID)
462 pref = ICMPV6_ROUTER_PREF_MEDIUM;
463
464 lifetime = ntohl(rinfo->lifetime);
465 if (lifetime == 0xffffffff) {
466 /* infinity */
467 } else if (lifetime > 0x7fffffff/HZ) {
468 /* Avoid arithmetic overflow */
469 lifetime = 0x7fffffff/HZ - 1;
470 }
471
472 if (rinfo->length == 3)
473 prefix = (struct in6_addr *)rinfo->prefix;
474 else {
475 /* this function is safe */
476 ipv6_addr_prefix(&prefix_buf,
477 (struct in6_addr *)rinfo->prefix,
478 rinfo->prefix_len);
479 prefix = &prefix_buf;
480 }
481
482 rt = rt6_get_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex);
483
484 if (rt && !lifetime) {
485 ip6_del_rt(rt);
486 rt = NULL;
487 }
488
489 if (!rt && lifetime)
490 rt = rt6_add_route_info(prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
491 pref);
492 else if (rt)
493 rt->rt6i_flags = RTF_ROUTEINFO |
494 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
495
496 if (rt) {
497 if (lifetime == 0xffffffff) {
498 rt->rt6i_flags &= ~RTF_EXPIRES;
499 } else {
500 rt->rt6i_expires = jiffies + HZ * lifetime;
501 rt->rt6i_flags |= RTF_EXPIRES;
502 }
503 dst_release(&rt->u.dst);
504 }
505 return 0;
506 }
507 #endif
508
509 #define BACKTRACK(saddr) \
510 do { \
511 if (rt == &ip6_null_entry) { \
512 struct fib6_node *pn; \
513 while (1) { \
514 if (fn->fn_flags & RTN_TL_ROOT) \
515 goto out; \
516 pn = fn->parent; \
517 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
518 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
519 else \
520 fn = pn; \
521 if (fn->fn_flags & RTN_RTINFO) \
522 goto restart; \
523 } \
524 } \
525 } while(0)
526
527 static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table,
528 struct flowi *fl, int flags)
529 {
530 struct fib6_node *fn;
531 struct rt6_info *rt;
532
533 read_lock_bh(&table->tb6_lock);
534 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
535 restart:
536 rt = fn->leaf;
537 rt = rt6_device_match(rt, fl->oif, flags);
538 BACKTRACK(&fl->fl6_src);
539 out:
540 dst_hold(&rt->u.dst);
541 read_unlock_bh(&table->tb6_lock);
542
543 rt->u.dst.lastuse = jiffies;
544 rt->u.dst.__use++;
545
546 return rt;
547
548 }
549
550 struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
551 int oif, int strict)
552 {
553 struct flowi fl = {
554 .oif = oif,
555 .nl_u = {
556 .ip6_u = {
557 .daddr = *daddr,
558 },
559 },
560 };
561 struct dst_entry *dst;
562 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
563
564 if (saddr) {
565 memcpy(&fl.fl6_src, saddr, sizeof(*saddr));
566 flags |= RT6_LOOKUP_F_HAS_SADDR;
567 }
568
569 dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_lookup);
570 if (dst->error == 0)
571 return (struct rt6_info *) dst;
572
573 dst_release(dst);
574
575 return NULL;
576 }
577
578 EXPORT_SYMBOL(rt6_lookup);
579
580 /* ip6_ins_rt is called with FREE table->tb6_lock.
581 It takes new route entry, the addition fails by any reason the
582 route is freed. In any case, if caller does not hold it, it may
583 be destroyed.
584 */
585
586 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
587 {
588 int err;
589 struct fib6_table *table;
590
591 table = rt->rt6i_table;
592 write_lock_bh(&table->tb6_lock);
593 err = fib6_add(&table->tb6_root, rt, info);
594 write_unlock_bh(&table->tb6_lock);
595
596 return err;
597 }
598
599 int ip6_ins_rt(struct rt6_info *rt)
600 {
601 return __ip6_ins_rt(rt, NULL);
602 }
603
604 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
605 struct in6_addr *saddr)
606 {
607 struct rt6_info *rt;
608
609 /*
610 * Clone the route.
611 */
612
613 rt = ip6_rt_copy(ort);
614
615 if (rt) {
616 if (!(rt->rt6i_flags&RTF_GATEWAY)) {
617 if (rt->rt6i_dst.plen != 128 &&
618 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr))
619 rt->rt6i_flags |= RTF_ANYCAST;
620 ipv6_addr_copy(&rt->rt6i_gateway, daddr);
621 }
622
623 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
624 rt->rt6i_dst.plen = 128;
625 rt->rt6i_flags |= RTF_CACHE;
626 rt->u.dst.flags |= DST_HOST;
627
628 #ifdef CONFIG_IPV6_SUBTREES
629 if (rt->rt6i_src.plen && saddr) {
630 ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
631 rt->rt6i_src.plen = 128;
632 }
633 #endif
634
635 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
636
637 }
638
639 return rt;
640 }
641
642 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr)
643 {
644 struct rt6_info *rt = ip6_rt_copy(ort);
645 if (rt) {
646 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
647 rt->rt6i_dst.plen = 128;
648 rt->rt6i_flags |= RTF_CACHE;
649 rt->u.dst.flags |= DST_HOST;
650 rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
651 }
652 return rt;
653 }
654
655 static struct rt6_info *ip6_pol_route_input(struct fib6_table *table,
656 struct flowi *fl, int flags)
657 {
658 struct fib6_node *fn;
659 struct rt6_info *rt, *nrt;
660 int strict = 0;
661 int attempts = 3;
662 int err;
663 int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
664
665 strict |= flags & RT6_LOOKUP_F_IFACE;
666
667 relookup:
668 read_lock_bh(&table->tb6_lock);
669
670 restart_2:
671 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
672
673 restart:
674 rt = rt6_select(fn, fl->iif, strict | reachable);
675 BACKTRACK(&fl->fl6_src);
676 if (rt == &ip6_null_entry ||
677 rt->rt6i_flags & RTF_CACHE)
678 goto out;
679
680 dst_hold(&rt->u.dst);
681 read_unlock_bh(&table->tb6_lock);
682
683 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
684 nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
685 else {
686 #if CLONE_OFFLINK_ROUTE
687 nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
688 #else
689 goto out2;
690 #endif
691 }
692
693 dst_release(&rt->u.dst);
694 rt = nrt ? : &ip6_null_entry;
695
696 dst_hold(&rt->u.dst);
697 if (nrt) {
698 err = ip6_ins_rt(nrt);
699 if (!err)
700 goto out2;
701 }
702
703 if (--attempts <= 0)
704 goto out2;
705
706 /*
707 * Race condition! In the gap, when table->tb6_lock was
708 * released someone could insert this route. Relookup.
709 */
710 dst_release(&rt->u.dst);
711 goto relookup;
712
713 out:
714 if (reachable) {
715 reachable = 0;
716 goto restart_2;
717 }
718 dst_hold(&rt->u.dst);
719 read_unlock_bh(&table->tb6_lock);
720 out2:
721 rt->u.dst.lastuse = jiffies;
722 rt->u.dst.__use++;
723
724 return rt;
725 }
726
727 void ip6_route_input(struct sk_buff *skb)
728 {
729 struct ipv6hdr *iph = ipv6_hdr(skb);
730 int flags = RT6_LOOKUP_F_HAS_SADDR;
731 struct flowi fl = {
732 .iif = skb->dev->ifindex,
733 .nl_u = {
734 .ip6_u = {
735 .daddr = iph->daddr,
736 .saddr = iph->saddr,
737 .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK,
738 },
739 },
740 .mark = skb->mark,
741 .proto = iph->nexthdr,
742 };
743
744 if (rt6_need_strict(&iph->daddr))
745 flags |= RT6_LOOKUP_F_IFACE;
746
747 skb->dst = fib6_rule_lookup(&fl, flags, ip6_pol_route_input);
748 }
749
750 static struct rt6_info *ip6_pol_route_output(struct fib6_table *table,
751 struct flowi *fl, int flags)
752 {
753 struct fib6_node *fn;
754 struct rt6_info *rt, *nrt;
755 int strict = 0;
756 int attempts = 3;
757 int err;
758 int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
759
760 strict |= flags & RT6_LOOKUP_F_IFACE;
761
762 relookup:
763 read_lock_bh(&table->tb6_lock);
764
765 restart_2:
766 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
767
768 restart:
769 rt = rt6_select(fn, fl->oif, strict | reachable);
770 BACKTRACK(&fl->fl6_src);
771 if (rt == &ip6_null_entry ||
772 rt->rt6i_flags & RTF_CACHE)
773 goto out;
774
775 dst_hold(&rt->u.dst);
776 read_unlock_bh(&table->tb6_lock);
777
778 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
779 nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
780 else {
781 #if CLONE_OFFLINK_ROUTE
782 nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
783 #else
784 goto out2;
785 #endif
786 }
787
788 dst_release(&rt->u.dst);
789 rt = nrt ? : &ip6_null_entry;
790
791 dst_hold(&rt->u.dst);
792 if (nrt) {
793 err = ip6_ins_rt(nrt);
794 if (!err)
795 goto out2;
796 }
797
798 if (--attempts <= 0)
799 goto out2;
800
801 /*
802 * Race condition! In the gap, when table->tb6_lock was
803 * released someone could insert this route. Relookup.
804 */
805 dst_release(&rt->u.dst);
806 goto relookup;
807
808 out:
809 if (reachable) {
810 reachable = 0;
811 goto restart_2;
812 }
813 dst_hold(&rt->u.dst);
814 read_unlock_bh(&table->tb6_lock);
815 out2:
816 rt->u.dst.lastuse = jiffies;
817 rt->u.dst.__use++;
818 return rt;
819 }
820
821 struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
822 {
823 int flags = 0;
824
825 if (rt6_need_strict(&fl->fl6_dst))
826 flags |= RT6_LOOKUP_F_IFACE;
827
828 if (!ipv6_addr_any(&fl->fl6_src))
829 flags |= RT6_LOOKUP_F_HAS_SADDR;
830
831 return fib6_rule_lookup(fl, flags, ip6_pol_route_output);
832 }
833
834 EXPORT_SYMBOL(ip6_route_output);
835
836 /*
837 * Destination cache support functions
838 */
839
840 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
841 {
842 struct rt6_info *rt;
843
844 rt = (struct rt6_info *) dst;
845
846 if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
847 return dst;
848
849 return NULL;
850 }
851
852 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
853 {
854 struct rt6_info *rt = (struct rt6_info *) dst;
855
856 if (rt) {
857 if (rt->rt6i_flags & RTF_CACHE)
858 ip6_del_rt(rt);
859 else
860 dst_release(dst);
861 }
862 return NULL;
863 }
864
865 static void ip6_link_failure(struct sk_buff *skb)
866 {
867 struct rt6_info *rt;
868
869 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
870
871 rt = (struct rt6_info *) skb->dst;
872 if (rt) {
873 if (rt->rt6i_flags&RTF_CACHE) {
874 dst_set_expires(&rt->u.dst, 0);
875 rt->rt6i_flags |= RTF_EXPIRES;
876 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
877 rt->rt6i_node->fn_sernum = -1;
878 }
879 }
880
881 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
882 {
883 struct rt6_info *rt6 = (struct rt6_info*)dst;
884
885 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
886 rt6->rt6i_flags |= RTF_MODIFIED;
887 if (mtu < IPV6_MIN_MTU) {
888 mtu = IPV6_MIN_MTU;
889 dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
890 }
891 dst->metrics[RTAX_MTU-1] = mtu;
892 call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
893 }
894 }
895
896 static int ipv6_get_mtu(struct net_device *dev);
897
898 static inline unsigned int ipv6_advmss(unsigned int mtu)
899 {
900 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
901
902 if (mtu < ip6_rt_min_advmss)
903 mtu = ip6_rt_min_advmss;
904
905 /*
906 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
907 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
908 * IPV6_MAXPLEN is also valid and means: "any MSS,
909 * rely only on pmtu discovery"
910 */
911 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
912 mtu = IPV6_MAXPLEN;
913 return mtu;
914 }
915
916 static struct dst_entry *ndisc_dst_gc_list;
917 static DEFINE_SPINLOCK(ndisc_lock);
918
919 struct dst_entry *ndisc_dst_alloc(struct net_device *dev,
920 struct neighbour *neigh,
921 struct in6_addr *addr,
922 int (*output)(struct sk_buff *))
923 {
924 struct rt6_info *rt;
925 struct inet6_dev *idev = in6_dev_get(dev);
926
927 if (unlikely(idev == NULL))
928 return NULL;
929
930 rt = ip6_dst_alloc();
931 if (unlikely(rt == NULL)) {
932 in6_dev_put(idev);
933 goto out;
934 }
935
936 dev_hold(dev);
937 if (neigh)
938 neigh_hold(neigh);
939 else
940 neigh = ndisc_get_neigh(dev, addr);
941
942 rt->rt6i_dev = dev;
943 rt->rt6i_idev = idev;
944 rt->rt6i_nexthop = neigh;
945 atomic_set(&rt->u.dst.__refcnt, 1);
946 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
947 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
948 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
949 rt->u.dst.output = output;
950
951 #if 0 /* there's no chance to use these for ndisc */
952 rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
953 ? DST_HOST
954 : 0;
955 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
956 rt->rt6i_dst.plen = 128;
957 #endif
958
959 spin_lock_bh(&ndisc_lock);
960 rt->u.dst.next = ndisc_dst_gc_list;
961 ndisc_dst_gc_list = &rt->u.dst;
962 spin_unlock_bh(&ndisc_lock);
963
964 fib6_force_start_gc();
965
966 out:
967 return &rt->u.dst;
968 }
969
970 int ndisc_dst_gc(int *more)
971 {
972 struct dst_entry *dst, *next, **pprev;
973 int freed;
974
975 next = NULL;
976 freed = 0;
977
978 spin_lock_bh(&ndisc_lock);
979 pprev = &ndisc_dst_gc_list;
980
981 while ((dst = *pprev) != NULL) {
982 if (!atomic_read(&dst->__refcnt)) {
983 *pprev = dst->next;
984 dst_free(dst);
985 freed++;
986 } else {
987 pprev = &dst->next;
988 (*more)++;
989 }
990 }
991
992 spin_unlock_bh(&ndisc_lock);
993
994 return freed;
995 }
996
997 static int ip6_dst_gc(void)
998 {
999 static unsigned expire = 30*HZ;
1000 static unsigned long last_gc;
1001 unsigned long now = jiffies;
1002
1003 if (time_after(last_gc + ip6_rt_gc_min_interval, now) &&
1004 atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size)
1005 goto out;
1006
1007 expire++;
1008 fib6_run_gc(expire);
1009 last_gc = now;
1010 if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh)
1011 expire = ip6_rt_gc_timeout>>1;
1012
1013 out:
1014 expire -= expire>>ip6_rt_gc_elasticity;
1015 return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size);
1016 }
1017
1018 /* Clean host part of a prefix. Not necessary in radix tree,
1019 but results in cleaner routing tables.
1020
1021 Remove it only when all the things will work!
1022 */
1023
1024 static int ipv6_get_mtu(struct net_device *dev)
1025 {
1026 int mtu = IPV6_MIN_MTU;
1027 struct inet6_dev *idev;
1028
1029 idev = in6_dev_get(dev);
1030 if (idev) {
1031 mtu = idev->cnf.mtu6;
1032 in6_dev_put(idev);
1033 }
1034 return mtu;
1035 }
1036
1037 int ipv6_get_hoplimit(struct net_device *dev)
1038 {
1039 int hoplimit = ipv6_devconf.hop_limit;
1040 struct inet6_dev *idev;
1041
1042 idev = in6_dev_get(dev);
1043 if (idev) {
1044 hoplimit = idev->cnf.hop_limit;
1045 in6_dev_put(idev);
1046 }
1047 return hoplimit;
1048 }
1049
1050 /*
1051 *
1052 */
1053
1054 int ip6_route_add(struct fib6_config *cfg)
1055 {
1056 int err;
1057 struct rt6_info *rt = NULL;
1058 struct net_device *dev = NULL;
1059 struct inet6_dev *idev = NULL;
1060 struct fib6_table *table;
1061 int addr_type;
1062
1063 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1064 return -EINVAL;
1065 #ifndef CONFIG_IPV6_SUBTREES
1066 if (cfg->fc_src_len)
1067 return -EINVAL;
1068 #endif
1069 if (cfg->fc_ifindex) {
1070 err = -ENODEV;
1071 dev = dev_get_by_index(cfg->fc_ifindex);
1072 if (!dev)
1073 goto out;
1074 idev = in6_dev_get(dev);
1075 if (!idev)
1076 goto out;
1077 }
1078
1079 if (cfg->fc_metric == 0)
1080 cfg->fc_metric = IP6_RT_PRIO_USER;
1081
1082 table = fib6_new_table(cfg->fc_table);
1083 if (table == NULL) {
1084 err = -ENOBUFS;
1085 goto out;
1086 }
1087
1088 rt = ip6_dst_alloc();
1089
1090 if (rt == NULL) {
1091 err = -ENOMEM;
1092 goto out;
1093 }
1094
1095 rt->u.dst.obsolete = -1;
1096 rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires);
1097
1098 if (cfg->fc_protocol == RTPROT_UNSPEC)
1099 cfg->fc_protocol = RTPROT_BOOT;
1100 rt->rt6i_protocol = cfg->fc_protocol;
1101
1102 addr_type = ipv6_addr_type(&cfg->fc_dst);
1103
1104 if (addr_type & IPV6_ADDR_MULTICAST)
1105 rt->u.dst.input = ip6_mc_input;
1106 else
1107 rt->u.dst.input = ip6_forward;
1108
1109 rt->u.dst.output = ip6_output;
1110
1111 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1112 rt->rt6i_dst.plen = cfg->fc_dst_len;
1113 if (rt->rt6i_dst.plen == 128)
1114 rt->u.dst.flags = DST_HOST;
1115
1116 #ifdef CONFIG_IPV6_SUBTREES
1117 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1118 rt->rt6i_src.plen = cfg->fc_src_len;
1119 #endif
1120
1121 rt->rt6i_metric = cfg->fc_metric;
1122
1123 /* We cannot add true routes via loopback here,
1124 they would result in kernel looping; promote them to reject routes
1125 */
1126 if ((cfg->fc_flags & RTF_REJECT) ||
1127 (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
1128 /* hold loopback dev/idev if we haven't done so. */
1129 if (dev != &loopback_dev) {
1130 if (dev) {
1131 dev_put(dev);
1132 in6_dev_put(idev);
1133 }
1134 dev = &loopback_dev;
1135 dev_hold(dev);
1136 idev = in6_dev_get(dev);
1137 if (!idev) {
1138 err = -ENODEV;
1139 goto out;
1140 }
1141 }
1142 rt->u.dst.output = ip6_pkt_discard_out;
1143 rt->u.dst.input = ip6_pkt_discard;
1144 rt->u.dst.error = -ENETUNREACH;
1145 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1146 goto install_route;
1147 }
1148
1149 if (cfg->fc_flags & RTF_GATEWAY) {
1150 struct in6_addr *gw_addr;
1151 int gwa_type;
1152
1153 gw_addr = &cfg->fc_gateway;
1154 ipv6_addr_copy(&rt->rt6i_gateway, gw_addr);
1155 gwa_type = ipv6_addr_type(gw_addr);
1156
1157 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1158 struct rt6_info *grt;
1159
1160 /* IPv6 strictly inhibits using not link-local
1161 addresses as nexthop address.
1162 Otherwise, router will not able to send redirects.
1163 It is very good, but in some (rare!) circumstances
1164 (SIT, PtP, NBMA NOARP links) it is handy to allow
1165 some exceptions. --ANK
1166 */
1167 err = -EINVAL;
1168 if (!(gwa_type&IPV6_ADDR_UNICAST))
1169 goto out;
1170
1171 grt = rt6_lookup(gw_addr, NULL, cfg->fc_ifindex, 1);
1172
1173 err = -EHOSTUNREACH;
1174 if (grt == NULL)
1175 goto out;
1176 if (dev) {
1177 if (dev != grt->rt6i_dev) {
1178 dst_release(&grt->u.dst);
1179 goto out;
1180 }
1181 } else {
1182 dev = grt->rt6i_dev;
1183 idev = grt->rt6i_idev;
1184 dev_hold(dev);
1185 in6_dev_hold(grt->rt6i_idev);
1186 }
1187 if (!(grt->rt6i_flags&RTF_GATEWAY))
1188 err = 0;
1189 dst_release(&grt->u.dst);
1190
1191 if (err)
1192 goto out;
1193 }
1194 err = -EINVAL;
1195 if (dev == NULL || (dev->flags&IFF_LOOPBACK))
1196 goto out;
1197 }
1198
1199 err = -ENODEV;
1200 if (dev == NULL)
1201 goto out;
1202
1203 if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
1204 rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
1205 if (IS_ERR(rt->rt6i_nexthop)) {
1206 err = PTR_ERR(rt->rt6i_nexthop);
1207 rt->rt6i_nexthop = NULL;
1208 goto out;
1209 }
1210 }
1211
1212 rt->rt6i_flags = cfg->fc_flags;
1213
1214 install_route:
1215 if (cfg->fc_mx) {
1216 struct nlattr *nla;
1217 int remaining;
1218
1219 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1220 int type = nla->nla_type;
1221
1222 if (type) {
1223 if (type > RTAX_MAX) {
1224 err = -EINVAL;
1225 goto out;
1226 }
1227
1228 rt->u.dst.metrics[type - 1] = nla_get_u32(nla);
1229 }
1230 }
1231 }
1232
1233 if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
1234 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1235 if (!rt->u.dst.metrics[RTAX_MTU-1])
1236 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
1237 if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
1238 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
1239 rt->u.dst.dev = dev;
1240 rt->rt6i_idev = idev;
1241 rt->rt6i_table = table;
1242 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1243
1244 out:
1245 if (dev)
1246 dev_put(dev);
1247 if (idev)
1248 in6_dev_put(idev);
1249 if (rt)
1250 dst_free(&rt->u.dst);
1251 return err;
1252 }
1253
1254 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1255 {
1256 int err;
1257 struct fib6_table *table;
1258
1259 if (rt == &ip6_null_entry)
1260 return -ENOENT;
1261
1262 table = rt->rt6i_table;
1263 write_lock_bh(&table->tb6_lock);
1264
1265 err = fib6_del(rt, info);
1266 dst_release(&rt->u.dst);
1267
1268 write_unlock_bh(&table->tb6_lock);
1269
1270 return err;
1271 }
1272
1273 int ip6_del_rt(struct rt6_info *rt)
1274 {
1275 return __ip6_del_rt(rt, NULL);
1276 }
1277
1278 static int ip6_route_del(struct fib6_config *cfg)
1279 {
1280 struct fib6_table *table;
1281 struct fib6_node *fn;
1282 struct rt6_info *rt;
1283 int err = -ESRCH;
1284
1285 table = fib6_get_table(cfg->fc_table);
1286 if (table == NULL)
1287 return err;
1288
1289 read_lock_bh(&table->tb6_lock);
1290
1291 fn = fib6_locate(&table->tb6_root,
1292 &cfg->fc_dst, cfg->fc_dst_len,
1293 &cfg->fc_src, cfg->fc_src_len);
1294
1295 if (fn) {
1296 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1297 if (cfg->fc_ifindex &&
1298 (rt->rt6i_dev == NULL ||
1299 rt->rt6i_dev->ifindex != cfg->fc_ifindex))
1300 continue;
1301 if (cfg->fc_flags & RTF_GATEWAY &&
1302 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1303 continue;
1304 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1305 continue;
1306 dst_hold(&rt->u.dst);
1307 read_unlock_bh(&table->tb6_lock);
1308
1309 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1310 }
1311 }
1312 read_unlock_bh(&table->tb6_lock);
1313
1314 return err;
1315 }
1316
1317 /*
1318 * Handle redirects
1319 */
1320 struct ip6rd_flowi {
1321 struct flowi fl;
1322 struct in6_addr gateway;
1323 };
1324
1325 static struct rt6_info *__ip6_route_redirect(struct fib6_table *table,
1326 struct flowi *fl,
1327 int flags)
1328 {
1329 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;
1330 struct rt6_info *rt;
1331 struct fib6_node *fn;
1332
1333 /*
1334 * Get the "current" route for this destination and
1335 * check if the redirect has come from approriate router.
1336 *
1337 * RFC 2461 specifies that redirects should only be
1338 * accepted if they come from the nexthop to the target.
1339 * Due to the way the routes are chosen, this notion
1340 * is a bit fuzzy and one might need to check all possible
1341 * routes.
1342 */
1343
1344 read_lock_bh(&table->tb6_lock);
1345 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1346 restart:
1347 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1348 /*
1349 * Current route is on-link; redirect is always invalid.
1350 *
1351 * Seems, previous statement is not true. It could
1352 * be node, which looks for us as on-link (f.e. proxy ndisc)
1353 * But then router serving it might decide, that we should
1354 * know truth 8)8) --ANK (980726).
1355 */
1356 if (rt6_check_expired(rt))
1357 continue;
1358 if (!(rt->rt6i_flags & RTF_GATEWAY))
1359 continue;
1360 if (fl->oif != rt->rt6i_dev->ifindex)
1361 continue;
1362 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1363 continue;
1364 break;
1365 }
1366
1367 if (!rt)
1368 rt = &ip6_null_entry;
1369 BACKTRACK(&fl->fl6_src);
1370 out:
1371 dst_hold(&rt->u.dst);
1372
1373 read_unlock_bh(&table->tb6_lock);
1374
1375 return rt;
1376 };
1377
1378 static struct rt6_info *ip6_route_redirect(struct in6_addr *dest,
1379 struct in6_addr *src,
1380 struct in6_addr *gateway,
1381 struct net_device *dev)
1382 {
1383 int flags = RT6_LOOKUP_F_HAS_SADDR;
1384 struct ip6rd_flowi rdfl = {
1385 .fl = {
1386 .oif = dev->ifindex,
1387 .nl_u = {
1388 .ip6_u = {
1389 .daddr = *dest,
1390 .saddr = *src,
1391 },
1392 },
1393 },
1394 .gateway = *gateway,
1395 };
1396
1397 if (rt6_need_strict(dest))
1398 flags |= RT6_LOOKUP_F_IFACE;
1399
1400 return (struct rt6_info *)fib6_rule_lookup((struct flowi *)&rdfl, flags, __ip6_route_redirect);
1401 }
1402
1403 void rt6_redirect(struct in6_addr *dest, struct in6_addr *src,
1404 struct in6_addr *saddr,
1405 struct neighbour *neigh, u8 *lladdr, int on_link)
1406 {
1407 struct rt6_info *rt, *nrt = NULL;
1408 struct netevent_redirect netevent;
1409
1410 rt = ip6_route_redirect(dest, src, saddr, neigh->dev);
1411
1412 if (rt == &ip6_null_entry) {
1413 if (net_ratelimit())
1414 printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
1415 "for redirect target\n");
1416 goto out;
1417 }
1418
1419 /*
1420 * We have finally decided to accept it.
1421 */
1422
1423 neigh_update(neigh, lladdr, NUD_STALE,
1424 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1425 NEIGH_UPDATE_F_OVERRIDE|
1426 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1427 NEIGH_UPDATE_F_ISROUTER))
1428 );
1429
1430 /*
1431 * Redirect received -> path was valid.
1432 * Look, redirects are sent only in response to data packets,
1433 * so that this nexthop apparently is reachable. --ANK
1434 */
1435 dst_confirm(&rt->u.dst);
1436
1437 /* Duplicate redirect: silently ignore. */
1438 if (neigh == rt->u.dst.neighbour)
1439 goto out;
1440
1441 nrt = ip6_rt_copy(rt);
1442 if (nrt == NULL)
1443 goto out;
1444
1445 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1446 if (on_link)
1447 nrt->rt6i_flags &= ~RTF_GATEWAY;
1448
1449 ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
1450 nrt->rt6i_dst.plen = 128;
1451 nrt->u.dst.flags |= DST_HOST;
1452
1453 ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
1454 nrt->rt6i_nexthop = neigh_clone(neigh);
1455 /* Reset pmtu, it may be better */
1456 nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
1457 nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst));
1458
1459 if (ip6_ins_rt(nrt))
1460 goto out;
1461
1462 netevent.old = &rt->u.dst;
1463 netevent.new = &nrt->u.dst;
1464 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1465
1466 if (rt->rt6i_flags&RTF_CACHE) {
1467 ip6_del_rt(rt);
1468 return;
1469 }
1470
1471 out:
1472 dst_release(&rt->u.dst);
1473 return;
1474 }
1475
1476 /*
1477 * Handle ICMP "packet too big" messages
1478 * i.e. Path MTU discovery
1479 */
1480
1481 void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
1482 struct net_device *dev, u32 pmtu)
1483 {
1484 struct rt6_info *rt, *nrt;
1485 int allfrag = 0;
1486
1487 rt = rt6_lookup(daddr, saddr, dev->ifindex, 0);
1488 if (rt == NULL)
1489 return;
1490
1491 if (pmtu >= dst_mtu(&rt->u.dst))
1492 goto out;
1493
1494 if (pmtu < IPV6_MIN_MTU) {
1495 /*
1496 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
1497 * MTU (1280) and a fragment header should always be included
1498 * after a node receiving Too Big message reporting PMTU is
1499 * less than the IPv6 Minimum Link MTU.
1500 */
1501 pmtu = IPV6_MIN_MTU;
1502 allfrag = 1;
1503 }
1504
1505 /* New mtu received -> path was valid.
1506 They are sent only in response to data packets,
1507 so that this nexthop apparently is reachable. --ANK
1508 */
1509 dst_confirm(&rt->u.dst);
1510
1511 /* Host route. If it is static, it would be better
1512 not to override it, but add new one, so that
1513 when cache entry will expire old pmtu
1514 would return automatically.
1515 */
1516 if (rt->rt6i_flags & RTF_CACHE) {
1517 rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1518 if (allfrag)
1519 rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1520 dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires);
1521 rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
1522 goto out;
1523 }
1524
1525 /* Network route.
1526 Two cases are possible:
1527 1. It is connected route. Action: COW
1528 2. It is gatewayed route or NONEXTHOP route. Action: clone it.
1529 */
1530 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
1531 nrt = rt6_alloc_cow(rt, daddr, saddr);
1532 else
1533 nrt = rt6_alloc_clone(rt, daddr);
1534
1535 if (nrt) {
1536 nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1537 if (allfrag)
1538 nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1539
1540 /* According to RFC 1981, detecting PMTU increase shouldn't be
1541 * happened within 5 mins, the recommended timer is 10 mins.
1542 * Here this route expiration time is set to ip6_rt_mtu_expires
1543 * which is 10 mins. After 10 mins the decreased pmtu is expired
1544 * and detecting PMTU increase will be automatically happened.
1545 */
1546 dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
1547 nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
1548
1549 ip6_ins_rt(nrt);
1550 }
1551 out:
1552 dst_release(&rt->u.dst);
1553 }
1554
1555 /*
1556 * Misc support functions
1557 */
1558
1559 static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
1560 {
1561 struct rt6_info *rt = ip6_dst_alloc();
1562
1563 if (rt) {
1564 rt->u.dst.input = ort->u.dst.input;
1565 rt->u.dst.output = ort->u.dst.output;
1566
1567 memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
1568 rt->u.dst.error = ort->u.dst.error;
1569 rt->u.dst.dev = ort->u.dst.dev;
1570 if (rt->u.dst.dev)
1571 dev_hold(rt->u.dst.dev);
1572 rt->rt6i_idev = ort->rt6i_idev;
1573 if (rt->rt6i_idev)
1574 in6_dev_hold(rt->rt6i_idev);
1575 rt->u.dst.lastuse = jiffies;
1576 rt->rt6i_expires = 0;
1577
1578 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
1579 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
1580 rt->rt6i_metric = 0;
1581
1582 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1583 #ifdef CONFIG_IPV6_SUBTREES
1584 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1585 #endif
1586 rt->rt6i_table = ort->rt6i_table;
1587 }
1588 return rt;
1589 }
1590
1591 #ifdef CONFIG_IPV6_ROUTE_INFO
1592 static struct rt6_info *rt6_get_route_info(struct in6_addr *prefix, int prefixlen,
1593 struct in6_addr *gwaddr, int ifindex)
1594 {
1595 struct fib6_node *fn;
1596 struct rt6_info *rt = NULL;
1597 struct fib6_table *table;
1598
1599 table = fib6_get_table(RT6_TABLE_INFO);
1600 if (table == NULL)
1601 return NULL;
1602
1603 write_lock_bh(&table->tb6_lock);
1604 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1605 if (!fn)
1606 goto out;
1607
1608 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1609 if (rt->rt6i_dev->ifindex != ifindex)
1610 continue;
1611 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1612 continue;
1613 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1614 continue;
1615 dst_hold(&rt->u.dst);
1616 break;
1617 }
1618 out:
1619 write_unlock_bh(&table->tb6_lock);
1620 return rt;
1621 }
1622
1623 static struct rt6_info *rt6_add_route_info(struct in6_addr *prefix, int prefixlen,
1624 struct in6_addr *gwaddr, int ifindex,
1625 unsigned pref)
1626 {
1627 struct fib6_config cfg = {
1628 .fc_table = RT6_TABLE_INFO,
1629 .fc_metric = 1024,
1630 .fc_ifindex = ifindex,
1631 .fc_dst_len = prefixlen,
1632 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1633 RTF_UP | RTF_PREF(pref),
1634 };
1635
1636 ipv6_addr_copy(&cfg.fc_dst, prefix);
1637 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1638
1639 /* We should treat it as a default route if prefix length is 0. */
1640 if (!prefixlen)
1641 cfg.fc_flags |= RTF_DEFAULT;
1642
1643 ip6_route_add(&cfg);
1644
1645 return rt6_get_route_info(prefix, prefixlen, gwaddr, ifindex);
1646 }
1647 #endif
1648
1649 struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
1650 {
1651 struct rt6_info *rt;
1652 struct fib6_table *table;
1653
1654 table = fib6_get_table(RT6_TABLE_DFLT);
1655 if (table == NULL)
1656 return NULL;
1657
1658 write_lock_bh(&table->tb6_lock);
1659 for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) {
1660 if (dev == rt->rt6i_dev &&
1661 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1662 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1663 break;
1664 }
1665 if (rt)
1666 dst_hold(&rt->u.dst);
1667 write_unlock_bh(&table->tb6_lock);
1668 return rt;
1669 }
1670
1671 struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1672 struct net_device *dev,
1673 unsigned int pref)
1674 {
1675 struct fib6_config cfg = {
1676 .fc_table = RT6_TABLE_DFLT,
1677 .fc_metric = 1024,
1678 .fc_ifindex = dev->ifindex,
1679 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1680 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1681 };
1682
1683 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1684
1685 ip6_route_add(&cfg);
1686
1687 return rt6_get_dflt_router(gwaddr, dev);
1688 }
1689
1690 void rt6_purge_dflt_routers(void)
1691 {
1692 struct rt6_info *rt;
1693 struct fib6_table *table;
1694
1695 /* NOTE: Keep consistent with rt6_get_dflt_router */
1696 table = fib6_get_table(RT6_TABLE_DFLT);
1697 if (table == NULL)
1698 return;
1699
1700 restart:
1701 read_lock_bh(&table->tb6_lock);
1702 for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) {
1703 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
1704 dst_hold(&rt->u.dst);
1705 read_unlock_bh(&table->tb6_lock);
1706 ip6_del_rt(rt);
1707 goto restart;
1708 }
1709 }
1710 read_unlock_bh(&table->tb6_lock);
1711 }
1712
1713 static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg,
1714 struct fib6_config *cfg)
1715 {
1716 memset(cfg, 0, sizeof(*cfg));
1717
1718 cfg->fc_table = RT6_TABLE_MAIN;
1719 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1720 cfg->fc_metric = rtmsg->rtmsg_metric;
1721 cfg->fc_expires = rtmsg->rtmsg_info;
1722 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1723 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1724 cfg->fc_flags = rtmsg->rtmsg_flags;
1725
1726 ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst);
1727 ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src);
1728 ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway);
1729 }
1730
1731 int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
1732 {
1733 struct fib6_config cfg;
1734 struct in6_rtmsg rtmsg;
1735 int err;
1736
1737 switch(cmd) {
1738 case SIOCADDRT: /* Add a route */
1739 case SIOCDELRT: /* Delete a route */
1740 if (!capable(CAP_NET_ADMIN))
1741 return -EPERM;
1742 err = copy_from_user(&rtmsg, arg,
1743 sizeof(struct in6_rtmsg));
1744 if (err)
1745 return -EFAULT;
1746
1747 rtmsg_to_fib6_config(&rtmsg, &cfg);
1748
1749 rtnl_lock();
1750 switch (cmd) {
1751 case SIOCADDRT:
1752 err = ip6_route_add(&cfg);
1753 break;
1754 case SIOCDELRT:
1755 err = ip6_route_del(&cfg);
1756 break;
1757 default:
1758 err = -EINVAL;
1759 }
1760 rtnl_unlock();
1761
1762 return err;
1763 };
1764
1765 return -EINVAL;
1766 }
1767
1768 /*
1769 * Drop the packet on the floor
1770 */
1771
1772 static inline int ip6_pkt_drop(struct sk_buff *skb, int code,
1773 int ipstats_mib_noroutes)
1774 {
1775 int type;
1776 switch (ipstats_mib_noroutes) {
1777 case IPSTATS_MIB_INNOROUTES:
1778 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
1779 if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) {
1780 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS);
1781 break;
1782 }
1783 /* FALLTHROUGH */
1784 case IPSTATS_MIB_OUTNOROUTES:
1785 IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes);
1786 break;
1787 }
1788 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev);
1789 kfree_skb(skb);
1790 return 0;
1791 }
1792
1793 static int ip6_pkt_discard(struct sk_buff *skb)
1794 {
1795 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
1796 }
1797
1798 static int ip6_pkt_discard_out(struct sk_buff *skb)
1799 {
1800 skb->dev = skb->dst->dev;
1801 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1802 }
1803
1804 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
1805
1806 static int ip6_pkt_prohibit(struct sk_buff *skb)
1807 {
1808 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
1809 }
1810
1811 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
1812 {
1813 skb->dev = skb->dst->dev;
1814 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
1815 }
1816
1817 static int ip6_pkt_blk_hole(struct sk_buff *skb)
1818 {
1819 kfree_skb(skb);
1820 return 0;
1821 }
1822
1823 #endif
1824
1825 /*
1826 * Allocate a dst for local (unicast / anycast) address.
1827 */
1828
1829 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
1830 const struct in6_addr *addr,
1831 int anycast)
1832 {
1833 struct rt6_info *rt = ip6_dst_alloc();
1834
1835 if (rt == NULL)
1836 return ERR_PTR(-ENOMEM);
1837
1838 dev_hold(&loopback_dev);
1839 in6_dev_hold(idev);
1840
1841 rt->u.dst.flags = DST_HOST;
1842 rt->u.dst.input = ip6_input;
1843 rt->u.dst.output = ip6_output;
1844 rt->rt6i_dev = &loopback_dev;
1845 rt->rt6i_idev = idev;
1846 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
1847 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
1848 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1849 rt->u.dst.obsolete = -1;
1850
1851 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
1852 if (anycast)
1853 rt->rt6i_flags |= RTF_ANYCAST;
1854 else
1855 rt->rt6i_flags |= RTF_LOCAL;
1856 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
1857 if (rt->rt6i_nexthop == NULL) {
1858 dst_free(&rt->u.dst);
1859 return ERR_PTR(-ENOMEM);
1860 }
1861
1862 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
1863 rt->rt6i_dst.plen = 128;
1864 rt->rt6i_table = fib6_get_table(RT6_TABLE_LOCAL);
1865
1866 atomic_set(&rt->u.dst.__refcnt, 1);
1867
1868 return rt;
1869 }
1870
1871 static int fib6_ifdown(struct rt6_info *rt, void *arg)
1872 {
1873 if (((void*)rt->rt6i_dev == arg || arg == NULL) &&
1874 rt != &ip6_null_entry) {
1875 RT6_TRACE("deleted by ifdown %p\n", rt);
1876 return -1;
1877 }
1878 return 0;
1879 }
1880
1881 void rt6_ifdown(struct net_device *dev)
1882 {
1883 fib6_clean_all(fib6_ifdown, 0, dev);
1884 }
1885
1886 struct rt6_mtu_change_arg
1887 {
1888 struct net_device *dev;
1889 unsigned mtu;
1890 };
1891
1892 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
1893 {
1894 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
1895 struct inet6_dev *idev;
1896
1897 /* In IPv6 pmtu discovery is not optional,
1898 so that RTAX_MTU lock cannot disable it.
1899 We still use this lock to block changes
1900 caused by addrconf/ndisc.
1901 */
1902
1903 idev = __in6_dev_get(arg->dev);
1904 if (idev == NULL)
1905 return 0;
1906
1907 /* For administrative MTU increase, there is no way to discover
1908 IPv6 PMTU increase, so PMTU increase should be updated here.
1909 Since RFC 1981 doesn't include administrative MTU increase
1910 update PMTU increase is a MUST. (i.e. jumbo frame)
1911 */
1912 /*
1913 If new MTU is less than route PMTU, this new MTU will be the
1914 lowest MTU in the path, update the route PMTU to reflect PMTU
1915 decreases; if new MTU is greater than route PMTU, and the
1916 old MTU is the lowest MTU in the path, update the route PMTU
1917 to reflect the increase. In this case if the other nodes' MTU
1918 also have the lowest MTU, TOO BIG MESSAGE will be lead to
1919 PMTU discouvery.
1920 */
1921 if (rt->rt6i_dev == arg->dev &&
1922 !dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
1923 (dst_mtu(&rt->u.dst) > arg->mtu ||
1924 (dst_mtu(&rt->u.dst) < arg->mtu &&
1925 dst_mtu(&rt->u.dst) == idev->cnf.mtu6)))
1926 rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
1927 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
1928 return 0;
1929 }
1930
1931 void rt6_mtu_change(struct net_device *dev, unsigned mtu)
1932 {
1933 struct rt6_mtu_change_arg arg = {
1934 .dev = dev,
1935 .mtu = mtu,
1936 };
1937
1938 fib6_clean_all(rt6_mtu_change_route, 0, &arg);
1939 }
1940
1941 static struct nla_policy rtm_ipv6_policy[RTA_MAX+1] __read_mostly = {
1942 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
1943 [RTA_OIF] = { .type = NLA_U32 },
1944 [RTA_IIF] = { .type = NLA_U32 },
1945 [RTA_PRIORITY] = { .type = NLA_U32 },
1946 [RTA_METRICS] = { .type = NLA_NESTED },
1947 };
1948
1949 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
1950 struct fib6_config *cfg)
1951 {
1952 struct rtmsg *rtm;
1953 struct nlattr *tb[RTA_MAX+1];
1954 int err;
1955
1956 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
1957 if (err < 0)
1958 goto errout;
1959
1960 err = -EINVAL;
1961 rtm = nlmsg_data(nlh);
1962 memset(cfg, 0, sizeof(*cfg));
1963
1964 cfg->fc_table = rtm->rtm_table;
1965 cfg->fc_dst_len = rtm->rtm_dst_len;
1966 cfg->fc_src_len = rtm->rtm_src_len;
1967 cfg->fc_flags = RTF_UP;
1968 cfg->fc_protocol = rtm->rtm_protocol;
1969
1970 if (rtm->rtm_type == RTN_UNREACHABLE)
1971 cfg->fc_flags |= RTF_REJECT;
1972
1973 cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
1974 cfg->fc_nlinfo.nlh = nlh;
1975
1976 if (tb[RTA_GATEWAY]) {
1977 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
1978 cfg->fc_flags |= RTF_GATEWAY;
1979 }
1980
1981 if (tb[RTA_DST]) {
1982 int plen = (rtm->rtm_dst_len + 7) >> 3;
1983
1984 if (nla_len(tb[RTA_DST]) < plen)
1985 goto errout;
1986
1987 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1988 }
1989
1990 if (tb[RTA_SRC]) {
1991 int plen = (rtm->rtm_src_len + 7) >> 3;
1992
1993 if (nla_len(tb[RTA_SRC]) < plen)
1994 goto errout;
1995
1996 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
1997 }
1998
1999 if (tb[RTA_OIF])
2000 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2001
2002 if (tb[RTA_PRIORITY])
2003 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2004
2005 if (tb[RTA_METRICS]) {
2006 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2007 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2008 }
2009
2010 if (tb[RTA_TABLE])
2011 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2012
2013 err = 0;
2014 errout:
2015 return err;
2016 }
2017
2018 int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2019 {
2020 struct fib6_config cfg;
2021 int err;
2022
2023 err = rtm_to_fib6_config(skb, nlh, &cfg);
2024 if (err < 0)
2025 return err;
2026
2027 return ip6_route_del(&cfg);
2028 }
2029
2030 int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2031 {
2032 struct fib6_config cfg;
2033 int err;
2034
2035 err = rtm_to_fib6_config(skb, nlh, &cfg);
2036 if (err < 0)
2037 return err;
2038
2039 return ip6_route_add(&cfg);
2040 }
2041
2042 static inline size_t rt6_nlmsg_size(void)
2043 {
2044 return NLMSG_ALIGN(sizeof(struct rtmsg))
2045 + nla_total_size(16) /* RTA_SRC */
2046 + nla_total_size(16) /* RTA_DST */
2047 + nla_total_size(16) /* RTA_GATEWAY */
2048 + nla_total_size(16) /* RTA_PREFSRC */
2049 + nla_total_size(4) /* RTA_TABLE */
2050 + nla_total_size(4) /* RTA_IIF */
2051 + nla_total_size(4) /* RTA_OIF */
2052 + nla_total_size(4) /* RTA_PRIORITY */
2053 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2054 + nla_total_size(sizeof(struct rta_cacheinfo));
2055 }
2056
2057 static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
2058 struct in6_addr *dst, struct in6_addr *src,
2059 int iif, int type, u32 pid, u32 seq,
2060 int prefix, unsigned int flags)
2061 {
2062 struct rtmsg *rtm;
2063 struct nlmsghdr *nlh;
2064 long expires;
2065 u32 table;
2066
2067 if (prefix) { /* user wants prefix routes only */
2068 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2069 /* success since this is not a prefix route */
2070 return 1;
2071 }
2072 }
2073
2074 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
2075 if (nlh == NULL)
2076 return -EMSGSIZE;
2077
2078 rtm = nlmsg_data(nlh);
2079 rtm->rtm_family = AF_INET6;
2080 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2081 rtm->rtm_src_len = rt->rt6i_src.plen;
2082 rtm->rtm_tos = 0;
2083 if (rt->rt6i_table)
2084 table = rt->rt6i_table->tb6_id;
2085 else
2086 table = RT6_TABLE_UNSPEC;
2087 rtm->rtm_table = table;
2088 NLA_PUT_U32(skb, RTA_TABLE, table);
2089 if (rt->rt6i_flags&RTF_REJECT)
2090 rtm->rtm_type = RTN_UNREACHABLE;
2091 else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
2092 rtm->rtm_type = RTN_LOCAL;
2093 else
2094 rtm->rtm_type = RTN_UNICAST;
2095 rtm->rtm_flags = 0;
2096 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2097 rtm->rtm_protocol = rt->rt6i_protocol;
2098 if (rt->rt6i_flags&RTF_DYNAMIC)
2099 rtm->rtm_protocol = RTPROT_REDIRECT;
2100 else if (rt->rt6i_flags & RTF_ADDRCONF)
2101 rtm->rtm_protocol = RTPROT_KERNEL;
2102 else if (rt->rt6i_flags&RTF_DEFAULT)
2103 rtm->rtm_protocol = RTPROT_RA;
2104
2105 if (rt->rt6i_flags&RTF_CACHE)
2106 rtm->rtm_flags |= RTM_F_CLONED;
2107
2108 if (dst) {
2109 NLA_PUT(skb, RTA_DST, 16, dst);
2110 rtm->rtm_dst_len = 128;
2111 } else if (rtm->rtm_dst_len)
2112 NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
2113 #ifdef CONFIG_IPV6_SUBTREES
2114 if (src) {
2115 NLA_PUT(skb, RTA_SRC, 16, src);
2116 rtm->rtm_src_len = 128;
2117 } else if (rtm->rtm_src_len)
2118 NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
2119 #endif
2120 if (iif)
2121 NLA_PUT_U32(skb, RTA_IIF, iif);
2122 else if (dst) {
2123 struct in6_addr saddr_buf;
2124 if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
2125 NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
2126 }
2127
2128 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
2129 goto nla_put_failure;
2130
2131 if (rt->u.dst.neighbour)
2132 NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);
2133
2134 if (rt->u.dst.dev)
2135 NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex);
2136
2137 NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric);
2138
2139 expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0;
2140 if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0,
2141 expires, rt->u.dst.error) < 0)
2142 goto nla_put_failure;
2143
2144 return nlmsg_end(skb, nlh);
2145
2146 nla_put_failure:
2147 nlmsg_cancel(skb, nlh);
2148 return -EMSGSIZE;
2149 }
2150
2151 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2152 {
2153 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2154 int prefix;
2155
2156 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2157 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2158 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2159 } else
2160 prefix = 0;
2161
2162 return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2163 NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
2164 prefix, NLM_F_MULTI);
2165 }
2166
2167 int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
2168 {
2169 struct nlattr *tb[RTA_MAX+1];
2170 struct rt6_info *rt;
2171 struct sk_buff *skb;
2172 struct rtmsg *rtm;
2173 struct flowi fl;
2174 int err, iif = 0;
2175
2176 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2177 if (err < 0)
2178 goto errout;
2179
2180 err = -EINVAL;
2181 memset(&fl, 0, sizeof(fl));
2182
2183 if (tb[RTA_SRC]) {
2184 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2185 goto errout;
2186
2187 ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC]));
2188 }
2189
2190 if (tb[RTA_DST]) {
2191 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2192 goto errout;
2193
2194 ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST]));
2195 }
2196
2197 if (tb[RTA_IIF])
2198 iif = nla_get_u32(tb[RTA_IIF]);
2199
2200 if (tb[RTA_OIF])
2201 fl.oif = nla_get_u32(tb[RTA_OIF]);
2202
2203 if (iif) {
2204 struct net_device *dev;
2205 dev = __dev_get_by_index(iif);
2206 if (!dev) {
2207 err = -ENODEV;
2208 goto errout;
2209 }
2210 }
2211
2212 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2213 if (skb == NULL) {
2214 err = -ENOBUFS;
2215 goto errout;
2216 }
2217
2218 /* Reserve room for dummy headers, this skb can pass
2219 through good chunk of routing engine.
2220 */
2221 skb_reset_mac_header(skb);
2222 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2223
2224 rt = (struct rt6_info*) ip6_route_output(NULL, &fl);
2225 skb->dst = &rt->u.dst;
2226
2227 err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
2228 RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2229 nlh->nlmsg_seq, 0, 0);
2230 if (err < 0) {
2231 kfree_skb(skb);
2232 goto errout;
2233 }
2234
2235 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
2236 errout:
2237 return err;
2238 }
2239
2240 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2241 {
2242 struct sk_buff *skb;
2243 u32 pid = 0, seq = 0;
2244 struct nlmsghdr *nlh = NULL;
2245 int err = -ENOBUFS;
2246
2247 if (info) {
2248 pid = info->pid;
2249 nlh = info->nlh;
2250 if (nlh)
2251 seq = nlh->nlmsg_seq;
2252 }
2253
2254 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2255 if (skb == NULL)
2256 goto errout;
2257
2258 err = rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0);
2259 if (err < 0) {
2260 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2261 WARN_ON(err == -EMSGSIZE);
2262 kfree_skb(skb);
2263 goto errout;
2264 }
2265 err = rtnl_notify(skb, pid, RTNLGRP_IPV6_ROUTE, nlh, gfp_any());
2266 errout:
2267 if (err < 0)
2268 rtnl_set_sk_err(RTNLGRP_IPV6_ROUTE, err);
2269 }
2270
2271 /*
2272 * /proc
2273 */
2274
2275 #ifdef CONFIG_PROC_FS
2276
2277 #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1)
2278
2279 struct rt6_proc_arg
2280 {
2281 char *buffer;
2282 int offset;
2283 int length;
2284 int skip;
2285 int len;
2286 };
2287
2288 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2289 {
2290 struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg;
2291
2292 if (arg->skip < arg->offset / RT6_INFO_LEN) {
2293 arg->skip++;
2294 return 0;
2295 }
2296
2297 if (arg->len >= arg->length)
2298 return 0;
2299
2300 arg->len += sprintf(arg->buffer + arg->len,
2301 NIP6_SEQFMT " %02x ",
2302 NIP6(rt->rt6i_dst.addr),
2303 rt->rt6i_dst.plen);
2304
2305 #ifdef CONFIG_IPV6_SUBTREES
2306 arg->len += sprintf(arg->buffer + arg->len,
2307 NIP6_SEQFMT " %02x ",
2308 NIP6(rt->rt6i_src.addr),
2309 rt->rt6i_src.plen);
2310 #else
2311 arg->len += sprintf(arg->buffer + arg->len,
2312 "00000000000000000000000000000000 00 ");
2313 #endif
2314
2315 if (rt->rt6i_nexthop) {
2316 arg->len += sprintf(arg->buffer + arg->len,
2317 NIP6_SEQFMT,
2318 NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key)));
2319 } else {
2320 arg->len += sprintf(arg->buffer + arg->len,
2321 "00000000000000000000000000000000");
2322 }
2323 arg->len += sprintf(arg->buffer + arg->len,
2324 " %08x %08x %08x %08x %8s\n",
2325 rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
2326 rt->u.dst.__use, rt->rt6i_flags,
2327 rt->rt6i_dev ? rt->rt6i_dev->name : "");
2328 return 0;
2329 }
2330
2331 static int rt6_proc_info(char *buffer, char **start, off_t offset, int length)
2332 {
2333 struct rt6_proc_arg arg = {
2334 .buffer = buffer,
2335 .offset = offset,
2336 .length = length,
2337 };
2338
2339 fib6_clean_all(rt6_info_route, 0, &arg);
2340
2341 *start = buffer;
2342 if (offset)
2343 *start += offset % RT6_INFO_LEN;
2344
2345 arg.len -= offset % RT6_INFO_LEN;
2346
2347 if (arg.len > length)
2348 arg.len = length;
2349 if (arg.len < 0)
2350 arg.len = 0;
2351
2352 return arg.len;
2353 }
2354
2355 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2356 {
2357 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2358 rt6_stats.fib_nodes, rt6_stats.fib_route_nodes,
2359 rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries,
2360 rt6_stats.fib_rt_cache,
2361 atomic_read(&ip6_dst_ops.entries),
2362 rt6_stats.fib_discarded_routes);
2363
2364 return 0;
2365 }
2366
2367 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2368 {
2369 return single_open(file, rt6_stats_seq_show, NULL);
2370 }
2371
2372 static const struct file_operations rt6_stats_seq_fops = {
2373 .owner = THIS_MODULE,
2374 .open = rt6_stats_seq_open,
2375 .read = seq_read,
2376 .llseek = seq_lseek,
2377 .release = single_release,
2378 };
2379 #endif /* CONFIG_PROC_FS */
2380
2381 #ifdef CONFIG_SYSCTL
2382
2383 static int flush_delay;
2384
2385 static
2386 int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
2387 void __user *buffer, size_t *lenp, loff_t *ppos)
2388 {
2389 if (write) {
2390 proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
2391 fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay);
2392 return 0;
2393 } else
2394 return -EINVAL;
2395 }
2396
2397 ctl_table ipv6_route_table[] = {
2398 {
2399 .ctl_name = NET_IPV6_ROUTE_FLUSH,
2400 .procname = "flush",
2401 .data = &flush_delay,
2402 .maxlen = sizeof(int),
2403 .mode = 0200,
2404 .proc_handler = &ipv6_sysctl_rtcache_flush
2405 },
2406 {
2407 .ctl_name = NET_IPV6_ROUTE_GC_THRESH,
2408 .procname = "gc_thresh",
2409 .data = &ip6_dst_ops.gc_thresh,
2410 .maxlen = sizeof(int),
2411 .mode = 0644,
2412 .proc_handler = &proc_dointvec,
2413 },
2414 {
2415 .ctl_name = NET_IPV6_ROUTE_MAX_SIZE,
2416 .procname = "max_size",
2417 .data = &ip6_rt_max_size,
2418 .maxlen = sizeof(int),
2419 .mode = 0644,
2420 .proc_handler = &proc_dointvec,
2421 },
2422 {
2423 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL,
2424 .procname = "gc_min_interval",
2425 .data = &ip6_rt_gc_min_interval,
2426 .maxlen = sizeof(int),
2427 .mode = 0644,
2428 .proc_handler = &proc_dointvec_jiffies,
2429 .strategy = &sysctl_jiffies,
2430 },
2431 {
2432 .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT,
2433 .procname = "gc_timeout",
2434 .data = &ip6_rt_gc_timeout,
2435 .maxlen = sizeof(int),
2436 .mode = 0644,
2437 .proc_handler = &proc_dointvec_jiffies,
2438 .strategy = &sysctl_jiffies,
2439 },
2440 {
2441 .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL,
2442 .procname = "gc_interval",
2443 .data = &ip6_rt_gc_interval,
2444 .maxlen = sizeof(int),
2445 .mode = 0644,
2446 .proc_handler = &proc_dointvec_jiffies,
2447 .strategy = &sysctl_jiffies,
2448 },
2449 {
2450 .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY,
2451 .procname = "gc_elasticity",
2452 .data = &ip6_rt_gc_elasticity,
2453 .maxlen = sizeof(int),
2454 .mode = 0644,
2455 .proc_handler = &proc_dointvec_jiffies,
2456 .strategy = &sysctl_jiffies,
2457 },
2458 {
2459 .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES,
2460 .procname = "mtu_expires",
2461 .data = &ip6_rt_mtu_expires,
2462 .maxlen = sizeof(int),
2463 .mode = 0644,
2464 .proc_handler = &proc_dointvec_jiffies,
2465 .strategy = &sysctl_jiffies,
2466 },
2467 {
2468 .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS,
2469 .procname = "min_adv_mss",
2470 .data = &ip6_rt_min_advmss,
2471 .maxlen = sizeof(int),
2472 .mode = 0644,
2473 .proc_handler = &proc_dointvec_jiffies,
2474 .strategy = &sysctl_jiffies,
2475 },
2476 {
2477 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
2478 .procname = "gc_min_interval_ms",
2479 .data = &ip6_rt_gc_min_interval,
2480 .maxlen = sizeof(int),
2481 .mode = 0644,
2482 .proc_handler = &proc_dointvec_ms_jiffies,
2483 .strategy = &sysctl_ms_jiffies,
2484 },
2485 { .ctl_name = 0 }
2486 };
2487
2488 #endif
2489
2490 void __init ip6_route_init(void)
2491 {
2492 struct proc_dir_entry *p;
2493
2494 ip6_dst_ops.kmem_cachep =
2495 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
2496 SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
2497 fib6_init();
2498 #ifdef CONFIG_PROC_FS
2499 p = proc_net_create("ipv6_route", 0, rt6_proc_info);
2500 if (p)
2501 p->owner = THIS_MODULE;
2502
2503 proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
2504 #endif
2505 #ifdef CONFIG_XFRM
2506 xfrm6_init();
2507 #endif
2508 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2509 fib6_rules_init();
2510 #endif
2511 }
2512
2513 void ip6_route_cleanup(void)
2514 {
2515 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2516 fib6_rules_cleanup();
2517 #endif
2518 #ifdef CONFIG_PROC_FS
2519 proc_net_remove("ipv6_route");
2520 proc_net_remove("rt6_stats");
2521 #endif
2522 #ifdef CONFIG_XFRM
2523 xfrm6_fini();
2524 #endif
2525 rt6_ifdown(NULL);
2526 fib6_gc_cleanup();
2527 kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
2528 }
kernel source for telekom puls (alcatel/mediatek)