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