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ipv6: reject locally assigned nexthop addresses
[linux-2.6/btrfs-unstable.git] / net / ipv6 / ip6mr.c
blob74ceb73c1c9a042b0f8f9f65c264e8426d65f7f3
1 /*
2 * Linux IPv6 multicast routing support for BSD pim6sd
3 * Based on net/ipv4/ipmr.c.
4 *
5 * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
6 * LSIIT Laboratory, Strasbourg, France
7 * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
8 * 6WIND, Paris, France
9 * Copyright (C)2007,2008 USAGI/WIDE Project
10 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 *
17 */
18
19 #include <asm/uaccess.h>
20 #include <linux/types.h>
21 #include <linux/sched.h>
22 #include <linux/errno.h>
23 #include <linux/timer.h>
24 #include <linux/mm.h>
25 #include <linux/kernel.h>
26 #include <linux/fcntl.h>
27 #include <linux/stat.h>
28 #include <linux/socket.h>
29 #include <linux/inet.h>
30 #include <linux/netdevice.h>
31 #include <linux/inetdevice.h>
32 #include <linux/proc_fs.h>
33 #include <linux/seq_file.h>
34 #include <linux/init.h>
35 #include <linux/slab.h>
36 #include <linux/compat.h>
37 #include <net/protocol.h>
38 #include <linux/skbuff.h>
39 #include <net/sock.h>
40 #include <net/raw.h>
41 #include <linux/notifier.h>
42 #include <linux/if_arp.h>
43 #include <net/checksum.h>
44 #include <net/netlink.h>
45 #include <net/fib_rules.h>
46
47 #include <net/ipv6.h>
48 #include <net/ip6_route.h>
49 #include <linux/mroute6.h>
50 #include <linux/pim.h>
51 #include <net/addrconf.h>
52 #include <linux/netfilter_ipv6.h>
53 #include <linux/export.h>
54 #include <net/ip6_checksum.h>
55 #include <linux/netconf.h>
56
57 struct mr6_table {
58 struct list_head list;
59 possible_net_t net;
60 u32 id;
61 struct sock *mroute6_sk;
62 struct timer_list ipmr_expire_timer;
63 struct list_head mfc6_unres_queue;
64 struct list_head mfc6_cache_array[MFC6_LINES];
65 struct mif_device vif6_table[MAXMIFS];
66 int maxvif;
67 atomic_t cache_resolve_queue_len;
68 bool mroute_do_assert;
69 bool mroute_do_pim;
70 #ifdef CONFIG_IPV6_PIMSM_V2
71 int mroute_reg_vif_num;
72 #endif
73 };
74
75 struct ip6mr_rule {
76 struct fib_rule common;
77 };
78
79 struct ip6mr_result {
80 struct mr6_table *mrt;
81 };
82
83 /* Big lock, protecting vif table, mrt cache and mroute socket state.
84 Note that the changes are semaphored via rtnl_lock.
85 */
86
87 static DEFINE_RWLOCK(mrt_lock);
88
89 /*
90 * Multicast router control variables
91 */
92
93 #define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL)
94
95 /* Special spinlock for queue of unresolved entries */
96 static DEFINE_SPINLOCK(mfc_unres_lock);
97
98 /* We return to original Alan's scheme. Hash table of resolved
99 entries is changed only in process context and protected
100 with weak lock mrt_lock. Queue of unresolved entries is protected
101 with strong spinlock mfc_unres_lock.
102
103 In this case data path is free of exclusive locks at all.
104 */
105
106 static struct kmem_cache *mrt_cachep __read_mostly;
107
108 static struct mr6_table *ip6mr_new_table(struct net *net, u32 id);
109 static void ip6mr_free_table(struct mr6_table *mrt);
110
111 static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
112 struct sk_buff *skb, struct mfc6_cache *cache);
113 static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
114 mifi_t mifi, int assert);
115 static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
116 struct mfc6_cache *c, struct rtmsg *rtm);
117 static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
118 int cmd);
119 static int ip6mr_rtm_dumproute(struct sk_buff *skb,
120 struct netlink_callback *cb);
121 static void mroute_clean_tables(struct mr6_table *mrt);
122 static void ipmr_expire_process(unsigned long arg);
123
124 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
125 #define ip6mr_for_each_table(mrt, net) \
126 list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list)
127
128 static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
129 {
130 struct mr6_table *mrt;
131
132 ip6mr_for_each_table(mrt, net) {
133 if (mrt->id == id)
134 return mrt;
135 }
136 return NULL;
137 }
138
139 static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
140 struct mr6_table **mrt)
141 {
142 int err;
143 struct ip6mr_result res;
144 struct fib_lookup_arg arg = {
145 .result = &res,
146 .flags = FIB_LOOKUP_NOREF,
147 };
148
149 err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
150 flowi6_to_flowi(flp6), 0, &arg);
151 if (err < 0)
152 return err;
153 *mrt = res.mrt;
154 return 0;
155 }
156
157 static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
158 int flags, struct fib_lookup_arg *arg)
159 {
160 struct ip6mr_result *res = arg->result;
161 struct mr6_table *mrt;
162
163 switch (rule->action) {
164 case FR_ACT_TO_TBL:
165 break;
166 case FR_ACT_UNREACHABLE:
167 return -ENETUNREACH;
168 case FR_ACT_PROHIBIT:
169 return -EACCES;
170 case FR_ACT_BLACKHOLE:
171 default:
172 return -EINVAL;
173 }
174
175 mrt = ip6mr_get_table(rule->fr_net, rule->table);
176 if (!mrt)
177 return -EAGAIN;
178 res->mrt = mrt;
179 return 0;
180 }
181
182 static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
183 {
184 return 1;
185 }
186
187 static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = {
188 FRA_GENERIC_POLICY,
189 };
190
191 static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
192 struct fib_rule_hdr *frh, struct nlattr **tb)
193 {
194 return 0;
195 }
196
197 static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
198 struct nlattr **tb)
199 {
200 return 1;
201 }
202
203 static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
204 struct fib_rule_hdr *frh)
205 {
206 frh->dst_len = 0;
207 frh->src_len = 0;
208 frh->tos = 0;
209 return 0;
210 }
211
212 static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
213 .family = RTNL_FAMILY_IP6MR,
214 .rule_size = sizeof(struct ip6mr_rule),
215 .addr_size = sizeof(struct in6_addr),
216 .action = ip6mr_rule_action,
217 .match = ip6mr_rule_match,
218 .configure = ip6mr_rule_configure,
219 .compare = ip6mr_rule_compare,
220 .default_pref = fib_default_rule_pref,
221 .fill = ip6mr_rule_fill,
222 .nlgroup = RTNLGRP_IPV6_RULE,
223 .policy = ip6mr_rule_policy,
224 .owner = THIS_MODULE,
225 };
226
227 static int __net_init ip6mr_rules_init(struct net *net)
228 {
229 struct fib_rules_ops *ops;
230 struct mr6_table *mrt;
231 int err;
232
233 ops = fib_rules_register(&ip6mr_rules_ops_template, net);
234 if (IS_ERR(ops))
235 return PTR_ERR(ops);
236
237 INIT_LIST_HEAD(&net->ipv6.mr6_tables);
238
239 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
240 if (!mrt) {
241 err = -ENOMEM;
242 goto err1;
243 }
244
245 err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
246 if (err < 0)
247 goto err2;
248
249 net->ipv6.mr6_rules_ops = ops;
250 return 0;
251
252 err2:
253 ip6mr_free_table(mrt);
254 err1:
255 fib_rules_unregister(ops);
256 return err;
257 }
258
259 static void __net_exit ip6mr_rules_exit(struct net *net)
260 {
261 struct mr6_table *mrt, *next;
262
263 rtnl_lock();
264 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
265 list_del(&mrt->list);
266 ip6mr_free_table(mrt);
267 }
268 fib_rules_unregister(net->ipv6.mr6_rules_ops);
269 rtnl_unlock();
270 }
271 #else
272 #define ip6mr_for_each_table(mrt, net) \
273 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
274
275 static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
276 {
277 return net->ipv6.mrt6;
278 }
279
280 static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
281 struct mr6_table **mrt)
282 {
283 *mrt = net->ipv6.mrt6;
284 return 0;
285 }
286
287 static int __net_init ip6mr_rules_init(struct net *net)
288 {
289 net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT);
290 return net->ipv6.mrt6 ? 0 : -ENOMEM;
291 }
292
293 static void __net_exit ip6mr_rules_exit(struct net *net)
294 {
295 rtnl_lock();
296 ip6mr_free_table(net->ipv6.mrt6);
297 net->ipv6.mrt6 = NULL;
298 rtnl_unlock();
299 }
300 #endif
301
302 static struct mr6_table *ip6mr_new_table(struct net *net, u32 id)
303 {
304 struct mr6_table *mrt;
305 unsigned int i;
306
307 mrt = ip6mr_get_table(net, id);
308 if (mrt)
309 return mrt;
310
311 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
312 if (!mrt)
313 return NULL;
314 mrt->id = id;
315 write_pnet(&mrt->net, net);
316
317 /* Forwarding cache */
318 for (i = 0; i < MFC6_LINES; i++)
319 INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]);
320
321 INIT_LIST_HEAD(&mrt->mfc6_unres_queue);
322
323 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
324 (unsigned long)mrt);
325
326 #ifdef CONFIG_IPV6_PIMSM_V2
327 mrt->mroute_reg_vif_num = -1;
328 #endif
329 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
330 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
331 #endif
332 return mrt;
333 }
334
335 static void ip6mr_free_table(struct mr6_table *mrt)
336 {
337 del_timer_sync(&mrt->ipmr_expire_timer);
338 mroute_clean_tables(mrt);
339 kfree(mrt);
340 }
341
342 #ifdef CONFIG_PROC_FS
343
344 struct ipmr_mfc_iter {
345 struct seq_net_private p;
346 struct mr6_table *mrt;
347 struct list_head *cache;
348 int ct;
349 };
350
351
352 static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net,
353 struct ipmr_mfc_iter *it, loff_t pos)
354 {
355 struct mr6_table *mrt = it->mrt;
356 struct mfc6_cache *mfc;
357
358 read_lock(&mrt_lock);
359 for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) {
360 it->cache = &mrt->mfc6_cache_array[it->ct];
361 list_for_each_entry(mfc, it->cache, list)
362 if (pos-- == 0)
363 return mfc;
364 }
365 read_unlock(&mrt_lock);
366
367 spin_lock_bh(&mfc_unres_lock);
368 it->cache = &mrt->mfc6_unres_queue;
369 list_for_each_entry(mfc, it->cache, list)
370 if (pos-- == 0)
371 return mfc;
372 spin_unlock_bh(&mfc_unres_lock);
373
374 it->cache = NULL;
375 return NULL;
376 }
377
378 /*
379 * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif
380 */
381
382 struct ipmr_vif_iter {
383 struct seq_net_private p;
384 struct mr6_table *mrt;
385 int ct;
386 };
387
388 static struct mif_device *ip6mr_vif_seq_idx(struct net *net,
389 struct ipmr_vif_iter *iter,
390 loff_t pos)
391 {
392 struct mr6_table *mrt = iter->mrt;
393
394 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
395 if (!MIF_EXISTS(mrt, iter->ct))
396 continue;
397 if (pos-- == 0)
398 return &mrt->vif6_table[iter->ct];
399 }
400 return NULL;
401 }
402
403 static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
404 __acquires(mrt_lock)
405 {
406 struct ipmr_vif_iter *iter = seq->private;
407 struct net *net = seq_file_net(seq);
408 struct mr6_table *mrt;
409
410 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
411 if (!mrt)
412 return ERR_PTR(-ENOENT);
413
414 iter->mrt = mrt;
415
416 read_lock(&mrt_lock);
417 return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1)
418 : SEQ_START_TOKEN;
419 }
420
421 static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
422 {
423 struct ipmr_vif_iter *iter = seq->private;
424 struct net *net = seq_file_net(seq);
425 struct mr6_table *mrt = iter->mrt;
426
427 ++*pos;
428 if (v == SEQ_START_TOKEN)
429 return ip6mr_vif_seq_idx(net, iter, 0);
430
431 while (++iter->ct < mrt->maxvif) {
432 if (!MIF_EXISTS(mrt, iter->ct))
433 continue;
434 return &mrt->vif6_table[iter->ct];
435 }
436 return NULL;
437 }
438
439 static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
440 __releases(mrt_lock)
441 {
442 read_unlock(&mrt_lock);
443 }
444
445 static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
446 {
447 struct ipmr_vif_iter *iter = seq->private;
448 struct mr6_table *mrt = iter->mrt;
449
450 if (v == SEQ_START_TOKEN) {
451 seq_puts(seq,
452 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
453 } else {
454 const struct mif_device *vif = v;
455 const char *name = vif->dev ? vif->dev->name : "none";
456
457 seq_printf(seq,
458 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
459 vif - mrt->vif6_table,
460 name, vif->bytes_in, vif->pkt_in,
461 vif->bytes_out, vif->pkt_out,
462 vif->flags);
463 }
464 return 0;
465 }
466
467 static const struct seq_operations ip6mr_vif_seq_ops = {
468 .start = ip6mr_vif_seq_start,
469 .next = ip6mr_vif_seq_next,
470 .stop = ip6mr_vif_seq_stop,
471 .show = ip6mr_vif_seq_show,
472 };
473
474 static int ip6mr_vif_open(struct inode *inode, struct file *file)
475 {
476 return seq_open_net(inode, file, &ip6mr_vif_seq_ops,
477 sizeof(struct ipmr_vif_iter));
478 }
479
480 static const struct file_operations ip6mr_vif_fops = {
481 .owner = THIS_MODULE,
482 .open = ip6mr_vif_open,
483 .read = seq_read,
484 .llseek = seq_lseek,
485 .release = seq_release_net,
486 };
487
488 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
489 {
490 struct ipmr_mfc_iter *it = seq->private;
491 struct net *net = seq_file_net(seq);
492 struct mr6_table *mrt;
493
494 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
495 if (!mrt)
496 return ERR_PTR(-ENOENT);
497
498 it->mrt = mrt;
499 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
500 : SEQ_START_TOKEN;
501 }
502
503 static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
504 {
505 struct mfc6_cache *mfc = v;
506 struct ipmr_mfc_iter *it = seq->private;
507 struct net *net = seq_file_net(seq);
508 struct mr6_table *mrt = it->mrt;
509
510 ++*pos;
511
512 if (v == SEQ_START_TOKEN)
513 return ipmr_mfc_seq_idx(net, seq->private, 0);
514
515 if (mfc->list.next != it->cache)
516 return list_entry(mfc->list.next, struct mfc6_cache, list);
517
518 if (it->cache == &mrt->mfc6_unres_queue)
519 goto end_of_list;
520
521 BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]);
522
523 while (++it->ct < MFC6_LINES) {
524 it->cache = &mrt->mfc6_cache_array[it->ct];
525 if (list_empty(it->cache))
526 continue;
527 return list_first_entry(it->cache, struct mfc6_cache, list);
528 }
529
530 /* exhausted cache_array, show unresolved */
531 read_unlock(&mrt_lock);
532 it->cache = &mrt->mfc6_unres_queue;
533 it->ct = 0;
534
535 spin_lock_bh(&mfc_unres_lock);
536 if (!list_empty(it->cache))
537 return list_first_entry(it->cache, struct mfc6_cache, list);
538
539 end_of_list:
540 spin_unlock_bh(&mfc_unres_lock);
541 it->cache = NULL;
542
543 return NULL;
544 }
545
546 static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
547 {
548 struct ipmr_mfc_iter *it = seq->private;
549 struct mr6_table *mrt = it->mrt;
550
551 if (it->cache == &mrt->mfc6_unres_queue)
552 spin_unlock_bh(&mfc_unres_lock);
553 else if (it->cache == mrt->mfc6_cache_array)
554 read_unlock(&mrt_lock);
555 }
556
557 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
558 {
559 int n;
560
561 if (v == SEQ_START_TOKEN) {
562 seq_puts(seq,
563 "Group "
564 "Origin "
565 "Iif Pkts Bytes Wrong Oifs\n");
566 } else {
567 const struct mfc6_cache *mfc = v;
568 const struct ipmr_mfc_iter *it = seq->private;
569 struct mr6_table *mrt = it->mrt;
570
571 seq_printf(seq, "%pI6 %pI6 %-3hd",
572 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
573 mfc->mf6c_parent);
574
575 if (it->cache != &mrt->mfc6_unres_queue) {
576 seq_printf(seq, " %8lu %8lu %8lu",
577 mfc->mfc_un.res.pkt,
578 mfc->mfc_un.res.bytes,
579 mfc->mfc_un.res.wrong_if);
580 for (n = mfc->mfc_un.res.minvif;
581 n < mfc->mfc_un.res.maxvif; n++) {
582 if (MIF_EXISTS(mrt, n) &&
583 mfc->mfc_un.res.ttls[n] < 255)
584 seq_printf(seq,
585 " %2d:%-3d",
586 n, mfc->mfc_un.res.ttls[n]);
587 }
588 } else {
589 /* unresolved mfc_caches don't contain
590 * pkt, bytes and wrong_if values
591 */
592 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
593 }
594 seq_putc(seq, '\n');
595 }
596 return 0;
597 }
598
599 static const struct seq_operations ipmr_mfc_seq_ops = {
600 .start = ipmr_mfc_seq_start,
601 .next = ipmr_mfc_seq_next,
602 .stop = ipmr_mfc_seq_stop,
603 .show = ipmr_mfc_seq_show,
604 };
605
606 static int ipmr_mfc_open(struct inode *inode, struct file *file)
607 {
608 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
609 sizeof(struct ipmr_mfc_iter));
610 }
611
612 static const struct file_operations ip6mr_mfc_fops = {
613 .owner = THIS_MODULE,
614 .open = ipmr_mfc_open,
615 .read = seq_read,
616 .llseek = seq_lseek,
617 .release = seq_release_net,
618 };
619 #endif
620
621 #ifdef CONFIG_IPV6_PIMSM_V2
622
623 static int pim6_rcv(struct sk_buff *skb)
624 {
625 struct pimreghdr *pim;
626 struct ipv6hdr *encap;
627 struct net_device *reg_dev = NULL;
628 struct net *net = dev_net(skb->dev);
629 struct mr6_table *mrt;
630 struct flowi6 fl6 = {
631 .flowi6_iif = skb->dev->ifindex,
632 .flowi6_mark = skb->mark,
633 };
634 int reg_vif_num;
635
636 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
637 goto drop;
638
639 pim = (struct pimreghdr *)skb_transport_header(skb);
640 if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
641 (pim->flags & PIM_NULL_REGISTER) ||
642 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
643 sizeof(*pim), IPPROTO_PIM,
644 csum_partial((void *)pim, sizeof(*pim), 0)) &&
645 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
646 goto drop;
647
648 /* check if the inner packet is destined to mcast group */
649 encap = (struct ipv6hdr *)(skb_transport_header(skb) +
650 sizeof(*pim));
651
652 if (!ipv6_addr_is_multicast(&encap->daddr) ||
653 encap->payload_len == 0 ||
654 ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
655 goto drop;
656
657 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
658 goto drop;
659 reg_vif_num = mrt->mroute_reg_vif_num;
660
661 read_lock(&mrt_lock);
662 if (reg_vif_num >= 0)
663 reg_dev = mrt->vif6_table[reg_vif_num].dev;
664 if (reg_dev)
665 dev_hold(reg_dev);
666 read_unlock(&mrt_lock);
667
668 if (!reg_dev)
669 goto drop;
670
671 skb->mac_header = skb->network_header;
672 skb_pull(skb, (u8 *)encap - skb->data);
673 skb_reset_network_header(skb);
674 skb->protocol = htons(ETH_P_IPV6);
675 skb->ip_summed = CHECKSUM_NONE;
676
677 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
678
679 netif_rx(skb);
680
681 dev_put(reg_dev);
682 return 0;
683 drop:
684 kfree_skb(skb);
685 return 0;
686 }
687
688 static const struct inet6_protocol pim6_protocol = {
689 .handler = pim6_rcv,
690 };
691
692 /* Service routines creating virtual interfaces: PIMREG */
693
694 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
695 struct net_device *dev)
696 {
697 struct net *net = dev_net(dev);
698 struct mr6_table *mrt;
699 struct flowi6 fl6 = {
700 .flowi6_oif = dev->ifindex,
701 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
702 .flowi6_mark = skb->mark,
703 };
704 int err;
705
706 err = ip6mr_fib_lookup(net, &fl6, &mrt);
707 if (err < 0) {
708 kfree_skb(skb);
709 return err;
710 }
711
712 read_lock(&mrt_lock);
713 dev->stats.tx_bytes += skb->len;
714 dev->stats.tx_packets++;
715 ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
716 read_unlock(&mrt_lock);
717 kfree_skb(skb);
718 return NETDEV_TX_OK;
719 }
720
721 static int reg_vif_get_iflink(const struct net_device *dev)
722 {
723 return 0;
724 }
725
726 static const struct net_device_ops reg_vif_netdev_ops = {
727 .ndo_start_xmit = reg_vif_xmit,
728 .ndo_get_iflink = reg_vif_get_iflink,
729 };
730
731 static void reg_vif_setup(struct net_device *dev)
732 {
733 dev->type = ARPHRD_PIMREG;
734 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
735 dev->flags = IFF_NOARP;
736 dev->netdev_ops = &reg_vif_netdev_ops;
737 dev->destructor = free_netdev;
738 dev->features |= NETIF_F_NETNS_LOCAL;
739 }
740
741 static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt)
742 {
743 struct net_device *dev;
744 char name[IFNAMSIZ];
745
746 if (mrt->id == RT6_TABLE_DFLT)
747 sprintf(name, "pim6reg");
748 else
749 sprintf(name, "pim6reg%u", mrt->id);
750
751 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
752 if (!dev)
753 return NULL;
754
755 dev_net_set(dev, net);
756
757 if (register_netdevice(dev)) {
758 free_netdev(dev);
759 return NULL;
760 }
761
762 if (dev_open(dev))
763 goto failure;
764
765 dev_hold(dev);
766 return dev;
767
768 failure:
769 /* allow the register to be completed before unregistering. */
770 rtnl_unlock();
771 rtnl_lock();
772
773 unregister_netdevice(dev);
774 return NULL;
775 }
776 #endif
777
778 /*
779 * Delete a VIF entry
780 */
781
782 static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head)
783 {
784 struct mif_device *v;
785 struct net_device *dev;
786 struct inet6_dev *in6_dev;
787
788 if (vifi < 0 || vifi >= mrt->maxvif)
789 return -EADDRNOTAVAIL;
790
791 v = &mrt->vif6_table[vifi];
792
793 write_lock_bh(&mrt_lock);
794 dev = v->dev;
795 v->dev = NULL;
796
797 if (!dev) {
798 write_unlock_bh(&mrt_lock);
799 return -EADDRNOTAVAIL;
800 }
801
802 #ifdef CONFIG_IPV6_PIMSM_V2
803 if (vifi == mrt->mroute_reg_vif_num)
804 mrt->mroute_reg_vif_num = -1;
805 #endif
806
807 if (vifi + 1 == mrt->maxvif) {
808 int tmp;
809 for (tmp = vifi - 1; tmp >= 0; tmp--) {
810 if (MIF_EXISTS(mrt, tmp))
811 break;
812 }
813 mrt->maxvif = tmp + 1;
814 }
815
816 write_unlock_bh(&mrt_lock);
817
818 dev_set_allmulti(dev, -1);
819
820 in6_dev = __in6_dev_get(dev);
821 if (in6_dev) {
822 in6_dev->cnf.mc_forwarding--;
823 inet6_netconf_notify_devconf(dev_net(dev),
824 NETCONFA_MC_FORWARDING,
825 dev->ifindex, &in6_dev->cnf);
826 }
827
828 if (v->flags & MIFF_REGISTER)
829 unregister_netdevice_queue(dev, head);
830
831 dev_put(dev);
832 return 0;
833 }
834
835 static inline void ip6mr_cache_free(struct mfc6_cache *c)
836 {
837 kmem_cache_free(mrt_cachep, c);
838 }
839
840 /* Destroy an unresolved cache entry, killing queued skbs
841 and reporting error to netlink readers.
842 */
843
844 static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c)
845 {
846 struct net *net = read_pnet(&mrt->net);
847 struct sk_buff *skb;
848
849 atomic_dec(&mrt->cache_resolve_queue_len);
850
851 while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
852 if (ipv6_hdr(skb)->version == 0) {
853 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
854 nlh->nlmsg_type = NLMSG_ERROR;
855 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
856 skb_trim(skb, nlh->nlmsg_len);
857 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
858 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
859 } else
860 kfree_skb(skb);
861 }
862
863 ip6mr_cache_free(c);
864 }
865
866
867 /* Timer process for all the unresolved queue. */
868
869 static void ipmr_do_expire_process(struct mr6_table *mrt)
870 {
871 unsigned long now = jiffies;
872 unsigned long expires = 10 * HZ;
873 struct mfc6_cache *c, *next;
874
875 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
876 if (time_after(c->mfc_un.unres.expires, now)) {
877 /* not yet... */
878 unsigned long interval = c->mfc_un.unres.expires - now;
879 if (interval < expires)
880 expires = interval;
881 continue;
882 }
883
884 list_del(&c->list);
885 mr6_netlink_event(mrt, c, RTM_DELROUTE);
886 ip6mr_destroy_unres(mrt, c);
887 }
888
889 if (!list_empty(&mrt->mfc6_unres_queue))
890 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
891 }
892
893 static void ipmr_expire_process(unsigned long arg)
894 {
895 struct mr6_table *mrt = (struct mr6_table *)arg;
896
897 if (!spin_trylock(&mfc_unres_lock)) {
898 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
899 return;
900 }
901
902 if (!list_empty(&mrt->mfc6_unres_queue))
903 ipmr_do_expire_process(mrt);
904
905 spin_unlock(&mfc_unres_lock);
906 }
907
908 /* Fill oifs list. It is called under write locked mrt_lock. */
909
910 static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache,
911 unsigned char *ttls)
912 {
913 int vifi;
914
915 cache->mfc_un.res.minvif = MAXMIFS;
916 cache->mfc_un.res.maxvif = 0;
917 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
918
919 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
920 if (MIF_EXISTS(mrt, vifi) &&
921 ttls[vifi] && ttls[vifi] < 255) {
922 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
923 if (cache->mfc_un.res.minvif > vifi)
924 cache->mfc_un.res.minvif = vifi;
925 if (cache->mfc_un.res.maxvif <= vifi)
926 cache->mfc_un.res.maxvif = vifi + 1;
927 }
928 }
929 }
930
931 static int mif6_add(struct net *net, struct mr6_table *mrt,
932 struct mif6ctl *vifc, int mrtsock)
933 {
934 int vifi = vifc->mif6c_mifi;
935 struct mif_device *v = &mrt->vif6_table[vifi];
936 struct net_device *dev;
937 struct inet6_dev *in6_dev;
938 int err;
939
940 /* Is vif busy ? */
941 if (MIF_EXISTS(mrt, vifi))
942 return -EADDRINUSE;
943
944 switch (vifc->mif6c_flags) {
945 #ifdef CONFIG_IPV6_PIMSM_V2
946 case MIFF_REGISTER:
947 /*
948 * Special Purpose VIF in PIM
949 * All the packets will be sent to the daemon
950 */
951 if (mrt->mroute_reg_vif_num >= 0)
952 return -EADDRINUSE;
953 dev = ip6mr_reg_vif(net, mrt);
954 if (!dev)
955 return -ENOBUFS;
956 err = dev_set_allmulti(dev, 1);
957 if (err) {
958 unregister_netdevice(dev);
959 dev_put(dev);
960 return err;
961 }
962 break;
963 #endif
964 case 0:
965 dev = dev_get_by_index(net, vifc->mif6c_pifi);
966 if (!dev)
967 return -EADDRNOTAVAIL;
968 err = dev_set_allmulti(dev, 1);
969 if (err) {
970 dev_put(dev);
971 return err;
972 }
973 break;
974 default:
975 return -EINVAL;
976 }
977
978 in6_dev = __in6_dev_get(dev);
979 if (in6_dev) {
980 in6_dev->cnf.mc_forwarding++;
981 inet6_netconf_notify_devconf(dev_net(dev),
982 NETCONFA_MC_FORWARDING,
983 dev->ifindex, &in6_dev->cnf);
984 }
985
986 /*
987 * Fill in the VIF structures
988 */
989 v->rate_limit = vifc->vifc_rate_limit;
990 v->flags = vifc->mif6c_flags;
991 if (!mrtsock)
992 v->flags |= VIFF_STATIC;
993 v->threshold = vifc->vifc_threshold;
994 v->bytes_in = 0;
995 v->bytes_out = 0;
996 v->pkt_in = 0;
997 v->pkt_out = 0;
998 v->link = dev->ifindex;
999 if (v->flags & MIFF_REGISTER)
1000 v->link = dev_get_iflink(dev);
1001
1002 /* And finish update writing critical data */
1003 write_lock_bh(&mrt_lock);
1004 v->dev = dev;
1005 #ifdef CONFIG_IPV6_PIMSM_V2
1006 if (v->flags & MIFF_REGISTER)
1007 mrt->mroute_reg_vif_num = vifi;
1008 #endif
1009 if (vifi + 1 > mrt->maxvif)
1010 mrt->maxvif = vifi + 1;
1011 write_unlock_bh(&mrt_lock);
1012 return 0;
1013 }
1014
1015 static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt,
1016 const struct in6_addr *origin,
1017 const struct in6_addr *mcastgrp)
1018 {
1019 int line = MFC6_HASH(mcastgrp, origin);
1020 struct mfc6_cache *c;
1021
1022 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1023 if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
1024 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
1025 return c;
1026 }
1027 return NULL;
1028 }
1029
1030 /* Look for a (*,*,oif) entry */
1031 static struct mfc6_cache *ip6mr_cache_find_any_parent(struct mr6_table *mrt,
1032 mifi_t mifi)
1033 {
1034 int line = MFC6_HASH(&in6addr_any, &in6addr_any);
1035 struct mfc6_cache *c;
1036
1037 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
1038 if (ipv6_addr_any(&c->mf6c_origin) &&
1039 ipv6_addr_any(&c->mf6c_mcastgrp) &&
1040 (c->mfc_un.res.ttls[mifi] < 255))
1041 return c;
1042
1043 return NULL;
1044 }
1045
1046 /* Look for a (*,G) entry */
1047 static struct mfc6_cache *ip6mr_cache_find_any(struct mr6_table *mrt,
1048 struct in6_addr *mcastgrp,
1049 mifi_t mifi)
1050 {
1051 int line = MFC6_HASH(mcastgrp, &in6addr_any);
1052 struct mfc6_cache *c, *proxy;
1053
1054 if (ipv6_addr_any(mcastgrp))
1055 goto skip;
1056
1057 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
1058 if (ipv6_addr_any(&c->mf6c_origin) &&
1059 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) {
1060 if (c->mfc_un.res.ttls[mifi] < 255)
1061 return c;
1062
1063 /* It's ok if the mifi is part of the static tree */
1064 proxy = ip6mr_cache_find_any_parent(mrt,
1065 c->mf6c_parent);
1066 if (proxy && proxy->mfc_un.res.ttls[mifi] < 255)
1067 return c;
1068 }
1069
1070 skip:
1071 return ip6mr_cache_find_any_parent(mrt, mifi);
1072 }
1073
1074 /*
1075 * Allocate a multicast cache entry
1076 */
1077 static struct mfc6_cache *ip6mr_cache_alloc(void)
1078 {
1079 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
1080 if (!c)
1081 return NULL;
1082 c->mfc_un.res.minvif = MAXMIFS;
1083 return c;
1084 }
1085
1086 static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
1087 {
1088 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
1089 if (!c)
1090 return NULL;
1091 skb_queue_head_init(&c->mfc_un.unres.unresolved);
1092 c->mfc_un.unres.expires = jiffies + 10 * HZ;
1093 return c;
1094 }
1095
1096 /*
1097 * A cache entry has gone into a resolved state from queued
1098 */
1099
1100 static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt,
1101 struct mfc6_cache *uc, struct mfc6_cache *c)
1102 {
1103 struct sk_buff *skb;
1104
1105 /*
1106 * Play the pending entries through our router
1107 */
1108
1109 while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
1110 if (ipv6_hdr(skb)->version == 0) {
1111 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
1112
1113 if (__ip6mr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
1114 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1115 } else {
1116 nlh->nlmsg_type = NLMSG_ERROR;
1117 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1118 skb_trim(skb, nlh->nlmsg_len);
1119 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
1120 }
1121 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1122 } else
1123 ip6_mr_forward(net, mrt, skb, c);
1124 }
1125 }
1126
1127 /*
1128 * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
1129 * expects the following bizarre scheme.
1130 *
1131 * Called under mrt_lock.
1132 */
1133
1134 static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
1135 mifi_t mifi, int assert)
1136 {
1137 struct sk_buff *skb;
1138 struct mrt6msg *msg;
1139 int ret;
1140
1141 #ifdef CONFIG_IPV6_PIMSM_V2
1142 if (assert == MRT6MSG_WHOLEPKT)
1143 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1144 +sizeof(*msg));
1145 else
1146 #endif
1147 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1148
1149 if (!skb)
1150 return -ENOBUFS;
1151
1152 /* I suppose that internal messages
1153 * do not require checksums */
1154
1155 skb->ip_summed = CHECKSUM_UNNECESSARY;
1156
1157 #ifdef CONFIG_IPV6_PIMSM_V2
1158 if (assert == MRT6MSG_WHOLEPKT) {
1159 /* Ugly, but we have no choice with this interface.
1160 Duplicate old header, fix length etc.
1161 And all this only to mangle msg->im6_msgtype and
1162 to set msg->im6_mbz to "mbz" :-)
1163 */
1164 skb_push(skb, -skb_network_offset(pkt));
1165
1166 skb_push(skb, sizeof(*msg));
1167 skb_reset_transport_header(skb);
1168 msg = (struct mrt6msg *)skb_transport_header(skb);
1169 msg->im6_mbz = 0;
1170 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
1171 msg->im6_mif = mrt->mroute_reg_vif_num;
1172 msg->im6_pad = 0;
1173 msg->im6_src = ipv6_hdr(pkt)->saddr;
1174 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1175
1176 skb->ip_summed = CHECKSUM_UNNECESSARY;
1177 } else
1178 #endif
1179 {
1180 /*
1181 * Copy the IP header
1182 */
1183
1184 skb_put(skb, sizeof(struct ipv6hdr));
1185 skb_reset_network_header(skb);
1186 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1187
1188 /*
1189 * Add our header
1190 */
1191 skb_put(skb, sizeof(*msg));
1192 skb_reset_transport_header(skb);
1193 msg = (struct mrt6msg *)skb_transport_header(skb);
1194
1195 msg->im6_mbz = 0;
1196 msg->im6_msgtype = assert;
1197 msg->im6_mif = mifi;
1198 msg->im6_pad = 0;
1199 msg->im6_src = ipv6_hdr(pkt)->saddr;
1200 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1201
1202 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1203 skb->ip_summed = CHECKSUM_UNNECESSARY;
1204 }
1205
1206 if (!mrt->mroute6_sk) {
1207 kfree_skb(skb);
1208 return -EINVAL;
1209 }
1210
1211 /*
1212 * Deliver to user space multicast routing algorithms
1213 */
1214 ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb);
1215 if (ret < 0) {
1216 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
1217 kfree_skb(skb);
1218 }
1219
1220 return ret;
1221 }
1222
1223 /*
1224 * Queue a packet for resolution. It gets locked cache entry!
1225 */
1226
1227 static int
1228 ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb)
1229 {
1230 bool found = false;
1231 int err;
1232 struct mfc6_cache *c;
1233
1234 spin_lock_bh(&mfc_unres_lock);
1235 list_for_each_entry(c, &mrt->mfc6_unres_queue, list) {
1236 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1237 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1238 found = true;
1239 break;
1240 }
1241 }
1242
1243 if (!found) {
1244 /*
1245 * Create a new entry if allowable
1246 */
1247
1248 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1249 (c = ip6mr_cache_alloc_unres()) == NULL) {
1250 spin_unlock_bh(&mfc_unres_lock);
1251
1252 kfree_skb(skb);
1253 return -ENOBUFS;
1254 }
1255
1256 /*
1257 * Fill in the new cache entry
1258 */
1259 c->mf6c_parent = -1;
1260 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1261 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1262
1263 /*
1264 * Reflect first query at pim6sd
1265 */
1266 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1267 if (err < 0) {
1268 /* If the report failed throw the cache entry
1269 out - Brad Parker
1270 */
1271 spin_unlock_bh(&mfc_unres_lock);
1272
1273 ip6mr_cache_free(c);
1274 kfree_skb(skb);
1275 return err;
1276 }
1277
1278 atomic_inc(&mrt->cache_resolve_queue_len);
1279 list_add(&c->list, &mrt->mfc6_unres_queue);
1280 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1281
1282 ipmr_do_expire_process(mrt);
1283 }
1284
1285 /*
1286 * See if we can append the packet
1287 */
1288 if (c->mfc_un.unres.unresolved.qlen > 3) {
1289 kfree_skb(skb);
1290 err = -ENOBUFS;
1291 } else {
1292 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1293 err = 0;
1294 }
1295
1296 spin_unlock_bh(&mfc_unres_lock);
1297 return err;
1298 }
1299
1300 /*
1301 * MFC6 cache manipulation by user space
1302 */
1303
1304 static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc,
1305 int parent)
1306 {
1307 int line;
1308 struct mfc6_cache *c, *next;
1309
1310 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1311
1312 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) {
1313 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1314 ipv6_addr_equal(&c->mf6c_mcastgrp,
1315 &mfc->mf6cc_mcastgrp.sin6_addr) &&
1316 (parent == -1 || parent == c->mf6c_parent)) {
1317 write_lock_bh(&mrt_lock);
1318 list_del(&c->list);
1319 write_unlock_bh(&mrt_lock);
1320
1321 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1322 ip6mr_cache_free(c);
1323 return 0;
1324 }
1325 }
1326 return -ENOENT;
1327 }
1328
1329 static int ip6mr_device_event(struct notifier_block *this,
1330 unsigned long event, void *ptr)
1331 {
1332 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1333 struct net *net = dev_net(dev);
1334 struct mr6_table *mrt;
1335 struct mif_device *v;
1336 int ct;
1337 LIST_HEAD(list);
1338
1339 if (event != NETDEV_UNREGISTER)
1340 return NOTIFY_DONE;
1341
1342 ip6mr_for_each_table(mrt, net) {
1343 v = &mrt->vif6_table[0];
1344 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1345 if (v->dev == dev)
1346 mif6_delete(mrt, ct, &list);
1347 }
1348 }
1349 unregister_netdevice_many(&list);
1350
1351 return NOTIFY_DONE;
1352 }
1353
1354 static struct notifier_block ip6_mr_notifier = {
1355 .notifier_call = ip6mr_device_event
1356 };
1357
1358 /*
1359 * Setup for IP multicast routing
1360 */
1361
1362 static int __net_init ip6mr_net_init(struct net *net)
1363 {
1364 int err;
1365
1366 err = ip6mr_rules_init(net);
1367 if (err < 0)
1368 goto fail;
1369
1370 #ifdef CONFIG_PROC_FS
1371 err = -ENOMEM;
1372 if (!proc_create("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_fops))
1373 goto proc_vif_fail;
1374 if (!proc_create("ip6_mr_cache", 0, net->proc_net, &ip6mr_mfc_fops))
1375 goto proc_cache_fail;
1376 #endif
1377
1378 return 0;
1379
1380 #ifdef CONFIG_PROC_FS
1381 proc_cache_fail:
1382 remove_proc_entry("ip6_mr_vif", net->proc_net);
1383 proc_vif_fail:
1384 ip6mr_rules_exit(net);
1385 #endif
1386 fail:
1387 return err;
1388 }
1389
1390 static void __net_exit ip6mr_net_exit(struct net *net)
1391 {
1392 #ifdef CONFIG_PROC_FS
1393 remove_proc_entry("ip6_mr_cache", net->proc_net);
1394 remove_proc_entry("ip6_mr_vif", net->proc_net);
1395 #endif
1396 ip6mr_rules_exit(net);
1397 }
1398
1399 static struct pernet_operations ip6mr_net_ops = {
1400 .init = ip6mr_net_init,
1401 .exit = ip6mr_net_exit,
1402 };
1403
1404 int __init ip6_mr_init(void)
1405 {
1406 int err;
1407
1408 mrt_cachep = kmem_cache_create("ip6_mrt_cache",
1409 sizeof(struct mfc6_cache),
1410 0, SLAB_HWCACHE_ALIGN,
1411 NULL);
1412 if (!mrt_cachep)
1413 return -ENOMEM;
1414
1415 err = register_pernet_subsys(&ip6mr_net_ops);
1416 if (err)
1417 goto reg_pernet_fail;
1418
1419 err = register_netdevice_notifier(&ip6_mr_notifier);
1420 if (err)
1421 goto reg_notif_fail;
1422 #ifdef CONFIG_IPV6_PIMSM_V2
1423 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1424 pr_err("%s: can't add PIM protocol\n", __func__);
1425 err = -EAGAIN;
1426 goto add_proto_fail;
1427 }
1428 #endif
1429 rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL,
1430 ip6mr_rtm_dumproute, NULL);
1431 return 0;
1432 #ifdef CONFIG_IPV6_PIMSM_V2
1433 add_proto_fail:
1434 unregister_netdevice_notifier(&ip6_mr_notifier);
1435 #endif
1436 reg_notif_fail:
1437 unregister_pernet_subsys(&ip6mr_net_ops);
1438 reg_pernet_fail:
1439 kmem_cache_destroy(mrt_cachep);
1440 return err;
1441 }
1442
1443 void ip6_mr_cleanup(void)
1444 {
1445 rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE);
1446 #ifdef CONFIG_IPV6_PIMSM_V2
1447 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
1448 #endif
1449 unregister_netdevice_notifier(&ip6_mr_notifier);
1450 unregister_pernet_subsys(&ip6mr_net_ops);
1451 kmem_cache_destroy(mrt_cachep);
1452 }
1453
1454 static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt,
1455 struct mf6cctl *mfc, int mrtsock, int parent)
1456 {
1457 bool found = false;
1458 int line;
1459 struct mfc6_cache *uc, *c;
1460 unsigned char ttls[MAXMIFS];
1461 int i;
1462
1463 if (mfc->mf6cc_parent >= MAXMIFS)
1464 return -ENFILE;
1465
1466 memset(ttls, 255, MAXMIFS);
1467 for (i = 0; i < MAXMIFS; i++) {
1468 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1469 ttls[i] = 1;
1470
1471 }
1472
1473 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1474
1475 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1476 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1477 ipv6_addr_equal(&c->mf6c_mcastgrp,
1478 &mfc->mf6cc_mcastgrp.sin6_addr) &&
1479 (parent == -1 || parent == mfc->mf6cc_parent)) {
1480 found = true;
1481 break;
1482 }
1483 }
1484
1485 if (found) {
1486 write_lock_bh(&mrt_lock);
1487 c->mf6c_parent = mfc->mf6cc_parent;
1488 ip6mr_update_thresholds(mrt, c, ttls);
1489 if (!mrtsock)
1490 c->mfc_flags |= MFC_STATIC;
1491 write_unlock_bh(&mrt_lock);
1492 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1493 return 0;
1494 }
1495
1496 if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
1497 !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1498 return -EINVAL;
1499
1500 c = ip6mr_cache_alloc();
1501 if (!c)
1502 return -ENOMEM;
1503
1504 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1505 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1506 c->mf6c_parent = mfc->mf6cc_parent;
1507 ip6mr_update_thresholds(mrt, c, ttls);
1508 if (!mrtsock)
1509 c->mfc_flags |= MFC_STATIC;
1510
1511 write_lock_bh(&mrt_lock);
1512 list_add(&c->list, &mrt->mfc6_cache_array[line]);
1513 write_unlock_bh(&mrt_lock);
1514
1515 /*
1516 * Check to see if we resolved a queued list. If so we
1517 * need to send on the frames and tidy up.
1518 */
1519 found = false;
1520 spin_lock_bh(&mfc_unres_lock);
1521 list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) {
1522 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1523 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1524 list_del(&uc->list);
1525 atomic_dec(&mrt->cache_resolve_queue_len);
1526 found = true;
1527 break;
1528 }
1529 }
1530 if (list_empty(&mrt->mfc6_unres_queue))
1531 del_timer(&mrt->ipmr_expire_timer);
1532 spin_unlock_bh(&mfc_unres_lock);
1533
1534 if (found) {
1535 ip6mr_cache_resolve(net, mrt, uc, c);
1536 ip6mr_cache_free(uc);
1537 }
1538 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1539 return 0;
1540 }
1541
1542 /*
1543 * Close the multicast socket, and clear the vif tables etc
1544 */
1545
1546 static void mroute_clean_tables(struct mr6_table *mrt)
1547 {
1548 int i;
1549 LIST_HEAD(list);
1550 struct mfc6_cache *c, *next;
1551
1552 /*
1553 * Shut down all active vif entries
1554 */
1555 for (i = 0; i < mrt->maxvif; i++) {
1556 if (!(mrt->vif6_table[i].flags & VIFF_STATIC))
1557 mif6_delete(mrt, i, &list);
1558 }
1559 unregister_netdevice_many(&list);
1560
1561 /*
1562 * Wipe the cache
1563 */
1564 for (i = 0; i < MFC6_LINES; i++) {
1565 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) {
1566 if (c->mfc_flags & MFC_STATIC)
1567 continue;
1568 write_lock_bh(&mrt_lock);
1569 list_del(&c->list);
1570 write_unlock_bh(&mrt_lock);
1571
1572 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1573 ip6mr_cache_free(c);
1574 }
1575 }
1576
1577 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1578 spin_lock_bh(&mfc_unres_lock);
1579 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
1580 list_del(&c->list);
1581 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1582 ip6mr_destroy_unres(mrt, c);
1583 }
1584 spin_unlock_bh(&mfc_unres_lock);
1585 }
1586 }
1587
1588 static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk)
1589 {
1590 int err = 0;
1591 struct net *net = sock_net(sk);
1592
1593 rtnl_lock();
1594 write_lock_bh(&mrt_lock);
1595 if (likely(mrt->mroute6_sk == NULL)) {
1596 mrt->mroute6_sk = sk;
1597 net->ipv6.devconf_all->mc_forwarding++;
1598 inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
1599 NETCONFA_IFINDEX_ALL,
1600 net->ipv6.devconf_all);
1601 }
1602 else
1603 err = -EADDRINUSE;
1604 write_unlock_bh(&mrt_lock);
1605
1606 rtnl_unlock();
1607
1608 return err;
1609 }
1610
1611 int ip6mr_sk_done(struct sock *sk)
1612 {
1613 int err = -EACCES;
1614 struct net *net = sock_net(sk);
1615 struct mr6_table *mrt;
1616
1617 rtnl_lock();
1618 ip6mr_for_each_table(mrt, net) {
1619 if (sk == mrt->mroute6_sk) {
1620 write_lock_bh(&mrt_lock);
1621 mrt->mroute6_sk = NULL;
1622 net->ipv6.devconf_all->mc_forwarding--;
1623 inet6_netconf_notify_devconf(net,
1624 NETCONFA_MC_FORWARDING,
1625 NETCONFA_IFINDEX_ALL,
1626 net->ipv6.devconf_all);
1627 write_unlock_bh(&mrt_lock);
1628
1629 mroute_clean_tables(mrt);
1630 err = 0;
1631 break;
1632 }
1633 }
1634 rtnl_unlock();
1635
1636 return err;
1637 }
1638
1639 struct sock *mroute6_socket(struct net *net, struct sk_buff *skb)
1640 {
1641 struct mr6_table *mrt;
1642 struct flowi6 fl6 = {
1643 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
1644 .flowi6_oif = skb->dev->ifindex,
1645 .flowi6_mark = skb->mark,
1646 };
1647
1648 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1649 return NULL;
1650
1651 return mrt->mroute6_sk;
1652 }
1653
1654 /*
1655 * Socket options and virtual interface manipulation. The whole
1656 * virtual interface system is a complete heap, but unfortunately
1657 * that's how BSD mrouted happens to think. Maybe one day with a proper
1658 * MOSPF/PIM router set up we can clean this up.
1659 */
1660
1661 int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1662 {
1663 int ret, parent = 0;
1664 struct mif6ctl vif;
1665 struct mf6cctl mfc;
1666 mifi_t mifi;
1667 struct net *net = sock_net(sk);
1668 struct mr6_table *mrt;
1669
1670 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1671 if (!mrt)
1672 return -ENOENT;
1673
1674 if (optname != MRT6_INIT) {
1675 if (sk != mrt->mroute6_sk && !ns_capable(net->user_ns, CAP_NET_ADMIN))
1676 return -EACCES;
1677 }
1678
1679 switch (optname) {
1680 case MRT6_INIT:
1681 if (sk->sk_type != SOCK_RAW ||
1682 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1683 return -EOPNOTSUPP;
1684 if (optlen < sizeof(int))
1685 return -EINVAL;
1686
1687 return ip6mr_sk_init(mrt, sk);
1688
1689 case MRT6_DONE:
1690 return ip6mr_sk_done(sk);
1691
1692 case MRT6_ADD_MIF:
1693 if (optlen < sizeof(vif))
1694 return -EINVAL;
1695 if (copy_from_user(&vif, optval, sizeof(vif)))
1696 return -EFAULT;
1697 if (vif.mif6c_mifi >= MAXMIFS)
1698 return -ENFILE;
1699 rtnl_lock();
1700 ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk);
1701 rtnl_unlock();
1702 return ret;
1703
1704 case MRT6_DEL_MIF:
1705 if (optlen < sizeof(mifi_t))
1706 return -EINVAL;
1707 if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
1708 return -EFAULT;
1709 rtnl_lock();
1710 ret = mif6_delete(mrt, mifi, NULL);
1711 rtnl_unlock();
1712 return ret;
1713
1714 /*
1715 * Manipulate the forwarding caches. These live
1716 * in a sort of kernel/user symbiosis.
1717 */
1718 case MRT6_ADD_MFC:
1719 case MRT6_DEL_MFC:
1720 parent = -1;
1721 case MRT6_ADD_MFC_PROXY:
1722 case MRT6_DEL_MFC_PROXY:
1723 if (optlen < sizeof(mfc))
1724 return -EINVAL;
1725 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1726 return -EFAULT;
1727 if (parent == 0)
1728 parent = mfc.mf6cc_parent;
1729 rtnl_lock();
1730 if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
1731 ret = ip6mr_mfc_delete(mrt, &mfc, parent);
1732 else
1733 ret = ip6mr_mfc_add(net, mrt, &mfc,
1734 sk == mrt->mroute6_sk, parent);
1735 rtnl_unlock();
1736 return ret;
1737
1738 /*
1739 * Control PIM assert (to activate pim will activate assert)
1740 */
1741 case MRT6_ASSERT:
1742 {
1743 int v;
1744
1745 if (optlen != sizeof(v))
1746 return -EINVAL;
1747 if (get_user(v, (int __user *)optval))
1748 return -EFAULT;
1749 mrt->mroute_do_assert = v;
1750 return 0;
1751 }
1752
1753 #ifdef CONFIG_IPV6_PIMSM_V2
1754 case MRT6_PIM:
1755 {
1756 int v;
1757
1758 if (optlen != sizeof(v))
1759 return -EINVAL;
1760 if (get_user(v, (int __user *)optval))
1761 return -EFAULT;
1762 v = !!v;
1763 rtnl_lock();
1764 ret = 0;
1765 if (v != mrt->mroute_do_pim) {
1766 mrt->mroute_do_pim = v;
1767 mrt->mroute_do_assert = v;
1768 }
1769 rtnl_unlock();
1770 return ret;
1771 }
1772
1773 #endif
1774 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1775 case MRT6_TABLE:
1776 {
1777 u32 v;
1778
1779 if (optlen != sizeof(u32))
1780 return -EINVAL;
1781 if (get_user(v, (u32 __user *)optval))
1782 return -EFAULT;
1783 /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
1784 if (v != RT_TABLE_DEFAULT && v >= 100000000)
1785 return -EINVAL;
1786 if (sk == mrt->mroute6_sk)
1787 return -EBUSY;
1788
1789 rtnl_lock();
1790 ret = 0;
1791 if (!ip6mr_new_table(net, v))
1792 ret = -ENOMEM;
1793 raw6_sk(sk)->ip6mr_table = v;
1794 rtnl_unlock();
1795 return ret;
1796 }
1797 #endif
1798 /*
1799 * Spurious command, or MRT6_VERSION which you cannot
1800 * set.
1801 */
1802 default:
1803 return -ENOPROTOOPT;
1804 }
1805 }
1806
1807 /*
1808 * Getsock opt support for the multicast routing system.
1809 */
1810
1811 int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1812 int __user *optlen)
1813 {
1814 int olr;
1815 int val;
1816 struct net *net = sock_net(sk);
1817 struct mr6_table *mrt;
1818
1819 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1820 if (!mrt)
1821 return -ENOENT;
1822
1823 switch (optname) {
1824 case MRT6_VERSION:
1825 val = 0x0305;
1826 break;
1827 #ifdef CONFIG_IPV6_PIMSM_V2
1828 case MRT6_PIM:
1829 val = mrt->mroute_do_pim;
1830 break;
1831 #endif
1832 case MRT6_ASSERT:
1833 val = mrt->mroute_do_assert;
1834 break;
1835 default:
1836 return -ENOPROTOOPT;
1837 }
1838
1839 if (get_user(olr, optlen))
1840 return -EFAULT;
1841
1842 olr = min_t(int, olr, sizeof(int));
1843 if (olr < 0)
1844 return -EINVAL;
1845
1846 if (put_user(olr, optlen))
1847 return -EFAULT;
1848 if (copy_to_user(optval, &val, olr))
1849 return -EFAULT;
1850 return 0;
1851 }
1852
1853 /*
1854 * The IP multicast ioctl support routines.
1855 */
1856
1857 int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1858 {
1859 struct sioc_sg_req6 sr;
1860 struct sioc_mif_req6 vr;
1861 struct mif_device *vif;
1862 struct mfc6_cache *c;
1863 struct net *net = sock_net(sk);
1864 struct mr6_table *mrt;
1865
1866 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1867 if (!mrt)
1868 return -ENOENT;
1869
1870 switch (cmd) {
1871 case SIOCGETMIFCNT_IN6:
1872 if (copy_from_user(&vr, arg, sizeof(vr)))
1873 return -EFAULT;
1874 if (vr.mifi >= mrt->maxvif)
1875 return -EINVAL;
1876 read_lock(&mrt_lock);
1877 vif = &mrt->vif6_table[vr.mifi];
1878 if (MIF_EXISTS(mrt, vr.mifi)) {
1879 vr.icount = vif->pkt_in;
1880 vr.ocount = vif->pkt_out;
1881 vr.ibytes = vif->bytes_in;
1882 vr.obytes = vif->bytes_out;
1883 read_unlock(&mrt_lock);
1884
1885 if (copy_to_user(arg, &vr, sizeof(vr)))
1886 return -EFAULT;
1887 return 0;
1888 }
1889 read_unlock(&mrt_lock);
1890 return -EADDRNOTAVAIL;
1891 case SIOCGETSGCNT_IN6:
1892 if (copy_from_user(&sr, arg, sizeof(sr)))
1893 return -EFAULT;
1894
1895 read_lock(&mrt_lock);
1896 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1897 if (c) {
1898 sr.pktcnt = c->mfc_un.res.pkt;
1899 sr.bytecnt = c->mfc_un.res.bytes;
1900 sr.wrong_if = c->mfc_un.res.wrong_if;
1901 read_unlock(&mrt_lock);
1902
1903 if (copy_to_user(arg, &sr, sizeof(sr)))
1904 return -EFAULT;
1905 return 0;
1906 }
1907 read_unlock(&mrt_lock);
1908 return -EADDRNOTAVAIL;
1909 default:
1910 return -ENOIOCTLCMD;
1911 }
1912 }
1913
1914 #ifdef CONFIG_COMPAT
1915 struct compat_sioc_sg_req6 {
1916 struct sockaddr_in6 src;
1917 struct sockaddr_in6 grp;
1918 compat_ulong_t pktcnt;
1919 compat_ulong_t bytecnt;
1920 compat_ulong_t wrong_if;
1921 };
1922
1923 struct compat_sioc_mif_req6 {
1924 mifi_t mifi;
1925 compat_ulong_t icount;
1926 compat_ulong_t ocount;
1927 compat_ulong_t ibytes;
1928 compat_ulong_t obytes;
1929 };
1930
1931 int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1932 {
1933 struct compat_sioc_sg_req6 sr;
1934 struct compat_sioc_mif_req6 vr;
1935 struct mif_device *vif;
1936 struct mfc6_cache *c;
1937 struct net *net = sock_net(sk);
1938 struct mr6_table *mrt;
1939
1940 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1941 if (!mrt)
1942 return -ENOENT;
1943
1944 switch (cmd) {
1945 case SIOCGETMIFCNT_IN6:
1946 if (copy_from_user(&vr, arg, sizeof(vr)))
1947 return -EFAULT;
1948 if (vr.mifi >= mrt->maxvif)
1949 return -EINVAL;
1950 read_lock(&mrt_lock);
1951 vif = &mrt->vif6_table[vr.mifi];
1952 if (MIF_EXISTS(mrt, vr.mifi)) {
1953 vr.icount = vif->pkt_in;
1954 vr.ocount = vif->pkt_out;
1955 vr.ibytes = vif->bytes_in;
1956 vr.obytes = vif->bytes_out;
1957 read_unlock(&mrt_lock);
1958
1959 if (copy_to_user(arg, &vr, sizeof(vr)))
1960 return -EFAULT;
1961 return 0;
1962 }
1963 read_unlock(&mrt_lock);
1964 return -EADDRNOTAVAIL;
1965 case SIOCGETSGCNT_IN6:
1966 if (copy_from_user(&sr, arg, sizeof(sr)))
1967 return -EFAULT;
1968
1969 read_lock(&mrt_lock);
1970 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1971 if (c) {
1972 sr.pktcnt = c->mfc_un.res.pkt;
1973 sr.bytecnt = c->mfc_un.res.bytes;
1974 sr.wrong_if = c->mfc_un.res.wrong_if;
1975 read_unlock(&mrt_lock);
1976
1977 if (copy_to_user(arg, &sr, sizeof(sr)))
1978 return -EFAULT;
1979 return 0;
1980 }
1981 read_unlock(&mrt_lock);
1982 return -EADDRNOTAVAIL;
1983 default:
1984 return -ENOIOCTLCMD;
1985 }
1986 }
1987 #endif
1988
1989 static inline int ip6mr_forward2_finish(struct sock *sk, struct sk_buff *skb)
1990 {
1991 IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
1992 IPSTATS_MIB_OUTFORWDATAGRAMS);
1993 IP6_ADD_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
1994 IPSTATS_MIB_OUTOCTETS, skb->len);
1995 return dst_output_sk(sk, skb);
1996 }
1997
1998 /*
1999 * Processing handlers for ip6mr_forward
2000 */
2001
2002 static int ip6mr_forward2(struct net *net, struct mr6_table *mrt,
2003 struct sk_buff *skb, struct mfc6_cache *c, int vifi)
2004 {
2005 struct ipv6hdr *ipv6h;
2006 struct mif_device *vif = &mrt->vif6_table[vifi];
2007 struct net_device *dev;
2008 struct dst_entry *dst;
2009 struct flowi6 fl6;
2010
2011 if (!vif->dev)
2012 goto out_free;
2013
2014 #ifdef CONFIG_IPV6_PIMSM_V2
2015 if (vif->flags & MIFF_REGISTER) {
2016 vif->pkt_out++;
2017 vif->bytes_out += skb->len;
2018 vif->dev->stats.tx_bytes += skb->len;
2019 vif->dev->stats.tx_packets++;
2020 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
2021 goto out_free;
2022 }
2023 #endif
2024
2025 ipv6h = ipv6_hdr(skb);
2026
2027 fl6 = (struct flowi6) {
2028 .flowi6_oif = vif->link,
2029 .daddr = ipv6h->daddr,
2030 };
2031
2032 dst = ip6_route_output(net, NULL, &fl6);
2033 if (dst->error) {
2034 dst_release(dst);
2035 goto out_free;
2036 }
2037
2038 skb_dst_drop(skb);
2039 skb_dst_set(skb, dst);
2040
2041 /*
2042 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
2043 * not only before forwarding, but after forwarding on all output
2044 * interfaces. It is clear, if mrouter runs a multicasting
2045 * program, it should receive packets not depending to what interface
2046 * program is joined.
2047 * If we will not make it, the program will have to join on all
2048 * interfaces. On the other hand, multihoming host (or router, but
2049 * not mrouter) cannot join to more than one interface - it will
2050 * result in receiving multiple packets.
2051 */
2052 dev = vif->dev;
2053 skb->dev = dev;
2054 vif->pkt_out++;
2055 vif->bytes_out += skb->len;
2056
2057 /* We are about to write */
2058 /* XXX: extension headers? */
2059 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
2060 goto out_free;
2061
2062 ipv6h = ipv6_hdr(skb);
2063 ipv6h->hop_limit--;
2064
2065 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
2066
2067 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, NULL, skb,
2068 skb->dev, dev,
2069 ip6mr_forward2_finish);
2070
2071 out_free:
2072 kfree_skb(skb);
2073 return 0;
2074 }
2075
2076 static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev)
2077 {
2078 int ct;
2079
2080 for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
2081 if (mrt->vif6_table[ct].dev == dev)
2082 break;
2083 }
2084 return ct;
2085 }
2086
2087 static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
2088 struct sk_buff *skb, struct mfc6_cache *cache)
2089 {
2090 int psend = -1;
2091 int vif, ct;
2092 int true_vifi = ip6mr_find_vif(mrt, skb->dev);
2093
2094 vif = cache->mf6c_parent;
2095 cache->mfc_un.res.pkt++;
2096 cache->mfc_un.res.bytes += skb->len;
2097
2098 if (ipv6_addr_any(&cache->mf6c_origin) && true_vifi >= 0) {
2099 struct mfc6_cache *cache_proxy;
2100
2101 /* For an (*,G) entry, we only check that the incoming
2102 * interface is part of the static tree.
2103 */
2104 cache_proxy = ip6mr_cache_find_any_parent(mrt, vif);
2105 if (cache_proxy &&
2106 cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
2107 goto forward;
2108 }
2109
2110 /*
2111 * Wrong interface: drop packet and (maybe) send PIM assert.
2112 */
2113 if (mrt->vif6_table[vif].dev != skb->dev) {
2114 cache->mfc_un.res.wrong_if++;
2115
2116 if (true_vifi >= 0 && mrt->mroute_do_assert &&
2117 /* pimsm uses asserts, when switching from RPT to SPT,
2118 so that we cannot check that packet arrived on an oif.
2119 It is bad, but otherwise we would need to move pretty
2120 large chunk of pimd to kernel. Ough... --ANK
2121 */
2122 (mrt->mroute_do_pim ||
2123 cache->mfc_un.res.ttls[true_vifi] < 255) &&
2124 time_after(jiffies,
2125 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
2126 cache->mfc_un.res.last_assert = jiffies;
2127 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2128 }
2129 goto dont_forward;
2130 }
2131
2132 forward:
2133 mrt->vif6_table[vif].pkt_in++;
2134 mrt->vif6_table[vif].bytes_in += skb->len;
2135
2136 /*
2137 * Forward the frame
2138 */
2139 if (ipv6_addr_any(&cache->mf6c_origin) &&
2140 ipv6_addr_any(&cache->mf6c_mcastgrp)) {
2141 if (true_vifi >= 0 &&
2142 true_vifi != cache->mf6c_parent &&
2143 ipv6_hdr(skb)->hop_limit >
2144 cache->mfc_un.res.ttls[cache->mf6c_parent]) {
2145 /* It's an (*,*) entry and the packet is not coming from
2146 * the upstream: forward the packet to the upstream
2147 * only.
2148 */
2149 psend = cache->mf6c_parent;
2150 goto last_forward;
2151 }
2152 goto dont_forward;
2153 }
2154 for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
2155 /* For (*,G) entry, don't forward to the incoming interface */
2156 if ((!ipv6_addr_any(&cache->mf6c_origin) || ct != true_vifi) &&
2157 ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
2158 if (psend != -1) {
2159 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2160 if (skb2)
2161 ip6mr_forward2(net, mrt, skb2, cache, psend);
2162 }
2163 psend = ct;
2164 }
2165 }
2166 last_forward:
2167 if (psend != -1) {
2168 ip6mr_forward2(net, mrt, skb, cache, psend);
2169 return;
2170 }
2171
2172 dont_forward:
2173 kfree_skb(skb);
2174 }
2175
2176
2177 /*
2178 * Multicast packets for forwarding arrive here
2179 */
2180
2181 int ip6_mr_input(struct sk_buff *skb)
2182 {
2183 struct mfc6_cache *cache;
2184 struct net *net = dev_net(skb->dev);
2185 struct mr6_table *mrt;
2186 struct flowi6 fl6 = {
2187 .flowi6_iif = skb->dev->ifindex,
2188 .flowi6_mark = skb->mark,
2189 };
2190 int err;
2191
2192 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2193 if (err < 0) {
2194 kfree_skb(skb);
2195 return err;
2196 }
2197
2198 read_lock(&mrt_lock);
2199 cache = ip6mr_cache_find(mrt,
2200 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2201 if (!cache) {
2202 int vif = ip6mr_find_vif(mrt, skb->dev);
2203
2204 if (vif >= 0)
2205 cache = ip6mr_cache_find_any(mrt,
2206 &ipv6_hdr(skb)->daddr,
2207 vif);
2208 }
2209
2210 /*
2211 * No usable cache entry
2212 */
2213 if (!cache) {
2214 int vif;
2215
2216 vif = ip6mr_find_vif(mrt, skb->dev);
2217 if (vif >= 0) {
2218 int err = ip6mr_cache_unresolved(mrt, vif, skb);
2219 read_unlock(&mrt_lock);
2220
2221 return err;
2222 }
2223 read_unlock(&mrt_lock);
2224 kfree_skb(skb);
2225 return -ENODEV;
2226 }
2227
2228 ip6_mr_forward(net, mrt, skb, cache);
2229
2230 read_unlock(&mrt_lock);
2231
2232 return 0;
2233 }
2234
2235
2236 static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2237 struct mfc6_cache *c, struct rtmsg *rtm)
2238 {
2239 int ct;
2240 struct rtnexthop *nhp;
2241 struct nlattr *mp_attr;
2242 struct rta_mfc_stats mfcs;
2243
2244 /* If cache is unresolved, don't try to parse IIF and OIF */
2245 if (c->mf6c_parent >= MAXMIFS)
2246 return -ENOENT;
2247
2248 if (MIF_EXISTS(mrt, c->mf6c_parent) &&
2249 nla_put_u32(skb, RTA_IIF, mrt->vif6_table[c->mf6c_parent].dev->ifindex) < 0)
2250 return -EMSGSIZE;
2251 mp_attr = nla_nest_start(skb, RTA_MULTIPATH);
2252 if (!mp_attr)
2253 return -EMSGSIZE;
2254
2255 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2256 if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2257 nhp = nla_reserve_nohdr(skb, sizeof(*nhp));
2258 if (!nhp) {
2259 nla_nest_cancel(skb, mp_attr);
2260 return -EMSGSIZE;
2261 }
2262
2263 nhp->rtnh_flags = 0;
2264 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2265 nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex;
2266 nhp->rtnh_len = sizeof(*nhp);
2267 }
2268 }
2269
2270 nla_nest_end(skb, mp_attr);
2271
2272 mfcs.mfcs_packets = c->mfc_un.res.pkt;
2273 mfcs.mfcs_bytes = c->mfc_un.res.bytes;
2274 mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
2275 if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0)
2276 return -EMSGSIZE;
2277
2278 rtm->rtm_type = RTN_MULTICAST;
2279 return 1;
2280 }
2281
2282 int ip6mr_get_route(struct net *net,
2283 struct sk_buff *skb, struct rtmsg *rtm, int nowait)
2284 {
2285 int err;
2286 struct mr6_table *mrt;
2287 struct mfc6_cache *cache;
2288 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
2289
2290 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2291 if (!mrt)
2292 return -ENOENT;
2293
2294 read_lock(&mrt_lock);
2295 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2296 if (!cache && skb->dev) {
2297 int vif = ip6mr_find_vif(mrt, skb->dev);
2298
2299 if (vif >= 0)
2300 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
2301 vif);
2302 }
2303
2304 if (!cache) {
2305 struct sk_buff *skb2;
2306 struct ipv6hdr *iph;
2307 struct net_device *dev;
2308 int vif;
2309
2310 if (nowait) {
2311 read_unlock(&mrt_lock);
2312 return -EAGAIN;
2313 }
2314
2315 dev = skb->dev;
2316 if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2317 read_unlock(&mrt_lock);
2318 return -ENODEV;
2319 }
2320
2321 /* really correct? */
2322 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2323 if (!skb2) {
2324 read_unlock(&mrt_lock);
2325 return -ENOMEM;
2326 }
2327
2328 skb_reset_transport_header(skb2);
2329
2330 skb_put(skb2, sizeof(struct ipv6hdr));
2331 skb_reset_network_header(skb2);
2332
2333 iph = ipv6_hdr(skb2);
2334 iph->version = 0;
2335 iph->priority = 0;
2336 iph->flow_lbl[0] = 0;
2337 iph->flow_lbl[1] = 0;
2338 iph->flow_lbl[2] = 0;
2339 iph->payload_len = 0;
2340 iph->nexthdr = IPPROTO_NONE;
2341 iph->hop_limit = 0;
2342 iph->saddr = rt->rt6i_src.addr;
2343 iph->daddr = rt->rt6i_dst.addr;
2344
2345 err = ip6mr_cache_unresolved(mrt, vif, skb2);
2346 read_unlock(&mrt_lock);
2347
2348 return err;
2349 }
2350
2351 if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
2352 cache->mfc_flags |= MFC_NOTIFY;
2353
2354 err = __ip6mr_fill_mroute(mrt, skb, cache, rtm);
2355 read_unlock(&mrt_lock);
2356 return err;
2357 }
2358
2359 static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2360 u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
2361 int flags)
2362 {
2363 struct nlmsghdr *nlh;
2364 struct rtmsg *rtm;
2365 int err;
2366
2367 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2368 if (!nlh)
2369 return -EMSGSIZE;
2370
2371 rtm = nlmsg_data(nlh);
2372 rtm->rtm_family = RTNL_FAMILY_IP6MR;
2373 rtm->rtm_dst_len = 128;
2374 rtm->rtm_src_len = 128;
2375 rtm->rtm_tos = 0;
2376 rtm->rtm_table = mrt->id;
2377 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2378 goto nla_put_failure;
2379 rtm->rtm_type = RTN_MULTICAST;
2380 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2381 if (c->mfc_flags & MFC_STATIC)
2382 rtm->rtm_protocol = RTPROT_STATIC;
2383 else
2384 rtm->rtm_protocol = RTPROT_MROUTED;
2385 rtm->rtm_flags = 0;
2386
2387 if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) ||
2388 nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp))
2389 goto nla_put_failure;
2390 err = __ip6mr_fill_mroute(mrt, skb, c, rtm);
2391 /* do not break the dump if cache is unresolved */
2392 if (err < 0 && err != -ENOENT)
2393 goto nla_put_failure;
2394
2395 nlmsg_end(skb, nlh);
2396 return 0;
2397
2398 nla_put_failure:
2399 nlmsg_cancel(skb, nlh);
2400 return -EMSGSIZE;
2401 }
2402
2403 static int mr6_msgsize(bool unresolved, int maxvif)
2404 {
2405 size_t len =
2406 NLMSG_ALIGN(sizeof(struct rtmsg))
2407 + nla_total_size(4) /* RTA_TABLE */
2408 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
2409 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
2410 ;
2411
2412 if (!unresolved)
2413 len = len
2414 + nla_total_size(4) /* RTA_IIF */
2415 + nla_total_size(0) /* RTA_MULTIPATH */
2416 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2417 /* RTA_MFC_STATS */
2418 + nla_total_size(sizeof(struct rta_mfc_stats))
2419 ;
2420
2421 return len;
2422 }
2423
2424 static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
2425 int cmd)
2426 {
2427 struct net *net = read_pnet(&mrt->net);
2428 struct sk_buff *skb;
2429 int err = -ENOBUFS;
2430
2431 skb = nlmsg_new(mr6_msgsize(mfc->mf6c_parent >= MAXMIFS, mrt->maxvif),
2432 GFP_ATOMIC);
2433 if (!skb)
2434 goto errout;
2435
2436 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2437 if (err < 0)
2438 goto errout;
2439
2440 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
2441 return;
2442
2443 errout:
2444 kfree_skb(skb);
2445 if (err < 0)
2446 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
2447 }
2448
2449 static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2450 {
2451 struct net *net = sock_net(skb->sk);
2452 struct mr6_table *mrt;
2453 struct mfc6_cache *mfc;
2454 unsigned int t = 0, s_t;
2455 unsigned int h = 0, s_h;
2456 unsigned int e = 0, s_e;
2457
2458 s_t = cb->args[0];
2459 s_h = cb->args[1];
2460 s_e = cb->args[2];
2461
2462 read_lock(&mrt_lock);
2463 ip6mr_for_each_table(mrt, net) {
2464 if (t < s_t)
2465 goto next_table;
2466 if (t > s_t)
2467 s_h = 0;
2468 for (h = s_h; h < MFC6_LINES; h++) {
2469 list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) {
2470 if (e < s_e)
2471 goto next_entry;
2472 if (ip6mr_fill_mroute(mrt, skb,
2473 NETLINK_CB(cb->skb).portid,
2474 cb->nlh->nlmsg_seq,
2475 mfc, RTM_NEWROUTE,
2476 NLM_F_MULTI) < 0)
2477 goto done;
2478 next_entry:
2479 e++;
2480 }
2481 e = s_e = 0;
2482 }
2483 spin_lock_bh(&mfc_unres_lock);
2484 list_for_each_entry(mfc, &mrt->mfc6_unres_queue, list) {
2485 if (e < s_e)
2486 goto next_entry2;
2487 if (ip6mr_fill_mroute(mrt, skb,
2488 NETLINK_CB(cb->skb).portid,
2489 cb->nlh->nlmsg_seq,
2490 mfc, RTM_NEWROUTE,
2491 NLM_F_MULTI) < 0) {
2492 spin_unlock_bh(&mfc_unres_lock);
2493 goto done;
2494 }
2495 next_entry2:
2496 e++;
2497 }
2498 spin_unlock_bh(&mfc_unres_lock);
2499 e = s_e = 0;
2500 s_h = 0;
2501 next_table:
2502 t++;
2503 }
2504 done:
2505 read_unlock(&mrt_lock);
2506
2507 cb->args[2] = e;
2508 cb->args[1] = h;
2509 cb->args[0] = t;
2510
2511 return skb->len;
2512 }
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