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[mirror_ubuntu-bionic-kernel.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);
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);
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 /* allow the register to be completed before unregistering. */
769 rtnl_unlock();
770 rtnl_lock();
771
772 unregister_netdevice(dev);
773 return NULL;
774 }
775 #endif
776
777 /*
778 * Delete a VIF entry
779 */
780
781 static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head)
782 {
783 struct mif_device *v;
784 struct net_device *dev;
785 struct inet6_dev *in6_dev;
786
787 if (vifi < 0 || vifi >= mrt->maxvif)
788 return -EADDRNOTAVAIL;
789
790 v = &mrt->vif6_table[vifi];
791
792 write_lock_bh(&mrt_lock);
793 dev = v->dev;
794 v->dev = NULL;
795
796 if (!dev) {
797 write_unlock_bh(&mrt_lock);
798 return -EADDRNOTAVAIL;
799 }
800
801 #ifdef CONFIG_IPV6_PIMSM_V2
802 if (vifi == mrt->mroute_reg_vif_num)
803 mrt->mroute_reg_vif_num = -1;
804 #endif
805
806 if (vifi + 1 == mrt->maxvif) {
807 int tmp;
808 for (tmp = vifi - 1; tmp >= 0; tmp--) {
809 if (MIF_EXISTS(mrt, tmp))
810 break;
811 }
812 mrt->maxvif = tmp + 1;
813 }
814
815 write_unlock_bh(&mrt_lock);
816
817 dev_set_allmulti(dev, -1);
818
819 in6_dev = __in6_dev_get(dev);
820 if (in6_dev) {
821 in6_dev->cnf.mc_forwarding--;
822 inet6_netconf_notify_devconf(dev_net(dev),
823 NETCONFA_MC_FORWARDING,
824 dev->ifindex, &in6_dev->cnf);
825 }
826
827 if (v->flags & MIFF_REGISTER)
828 unregister_netdevice_queue(dev, head);
829
830 dev_put(dev);
831 return 0;
832 }
833
834 static inline void ip6mr_cache_free(struct mfc6_cache *c)
835 {
836 kmem_cache_free(mrt_cachep, c);
837 }
838
839 /* Destroy an unresolved cache entry, killing queued skbs
840 and reporting error to netlink readers.
841 */
842
843 static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c)
844 {
845 struct net *net = read_pnet(&mrt->net);
846 struct sk_buff *skb;
847
848 atomic_dec(&mrt->cache_resolve_queue_len);
849
850 while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
851 if (ipv6_hdr(skb)->version == 0) {
852 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
853 nlh->nlmsg_type = NLMSG_ERROR;
854 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
855 skb_trim(skb, nlh->nlmsg_len);
856 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
857 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
858 } else
859 kfree_skb(skb);
860 }
861
862 ip6mr_cache_free(c);
863 }
864
865
866 /* Timer process for all the unresolved queue. */
867
868 static void ipmr_do_expire_process(struct mr6_table *mrt)
869 {
870 unsigned long now = jiffies;
871 unsigned long expires = 10 * HZ;
872 struct mfc6_cache *c, *next;
873
874 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
875 if (time_after(c->mfc_un.unres.expires, now)) {
876 /* not yet... */
877 unsigned long interval = c->mfc_un.unres.expires - now;
878 if (interval < expires)
879 expires = interval;
880 continue;
881 }
882
883 list_del(&c->list);
884 mr6_netlink_event(mrt, c, RTM_DELROUTE);
885 ip6mr_destroy_unres(mrt, c);
886 }
887
888 if (!list_empty(&mrt->mfc6_unres_queue))
889 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
890 }
891
892 static void ipmr_expire_process(unsigned long arg)
893 {
894 struct mr6_table *mrt = (struct mr6_table *)arg;
895
896 if (!spin_trylock(&mfc_unres_lock)) {
897 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
898 return;
899 }
900
901 if (!list_empty(&mrt->mfc6_unres_queue))
902 ipmr_do_expire_process(mrt);
903
904 spin_unlock(&mfc_unres_lock);
905 }
906
907 /* Fill oifs list. It is called under write locked mrt_lock. */
908
909 static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache,
910 unsigned char *ttls)
911 {
912 int vifi;
913
914 cache->mfc_un.res.minvif = MAXMIFS;
915 cache->mfc_un.res.maxvif = 0;
916 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
917
918 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
919 if (MIF_EXISTS(mrt, vifi) &&
920 ttls[vifi] && ttls[vifi] < 255) {
921 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
922 if (cache->mfc_un.res.minvif > vifi)
923 cache->mfc_un.res.minvif = vifi;
924 if (cache->mfc_un.res.maxvif <= vifi)
925 cache->mfc_un.res.maxvif = vifi + 1;
926 }
927 }
928 }
929
930 static int mif6_add(struct net *net, struct mr6_table *mrt,
931 struct mif6ctl *vifc, int mrtsock)
932 {
933 int vifi = vifc->mif6c_mifi;
934 struct mif_device *v = &mrt->vif6_table[vifi];
935 struct net_device *dev;
936 struct inet6_dev *in6_dev;
937 int err;
938
939 /* Is vif busy ? */
940 if (MIF_EXISTS(mrt, vifi))
941 return -EADDRINUSE;
942
943 switch (vifc->mif6c_flags) {
944 #ifdef CONFIG_IPV6_PIMSM_V2
945 case MIFF_REGISTER:
946 /*
947 * Special Purpose VIF in PIM
948 * All the packets will be sent to the daemon
949 */
950 if (mrt->mroute_reg_vif_num >= 0)
951 return -EADDRINUSE;
952 dev = ip6mr_reg_vif(net, mrt);
953 if (!dev)
954 return -ENOBUFS;
955 err = dev_set_allmulti(dev, 1);
956 if (err) {
957 unregister_netdevice(dev);
958 dev_put(dev);
959 return err;
960 }
961 break;
962 #endif
963 case 0:
964 dev = dev_get_by_index(net, vifc->mif6c_pifi);
965 if (!dev)
966 return -EADDRNOTAVAIL;
967 err = dev_set_allmulti(dev, 1);
968 if (err) {
969 dev_put(dev);
970 return err;
971 }
972 break;
973 default:
974 return -EINVAL;
975 }
976
977 in6_dev = __in6_dev_get(dev);
978 if (in6_dev) {
979 in6_dev->cnf.mc_forwarding++;
980 inet6_netconf_notify_devconf(dev_net(dev),
981 NETCONFA_MC_FORWARDING,
982 dev->ifindex, &in6_dev->cnf);
983 }
984
985 /*
986 * Fill in the VIF structures
987 */
988 v->rate_limit = vifc->vifc_rate_limit;
989 v->flags = vifc->mif6c_flags;
990 if (!mrtsock)
991 v->flags |= VIFF_STATIC;
992 v->threshold = vifc->vifc_threshold;
993 v->bytes_in = 0;
994 v->bytes_out = 0;
995 v->pkt_in = 0;
996 v->pkt_out = 0;
997 v->link = dev->ifindex;
998 if (v->flags & MIFF_REGISTER)
999 v->link = dev_get_iflink(dev);
1000
1001 /* And finish update writing critical data */
1002 write_lock_bh(&mrt_lock);
1003 v->dev = dev;
1004 #ifdef CONFIG_IPV6_PIMSM_V2
1005 if (v->flags & MIFF_REGISTER)
1006 mrt->mroute_reg_vif_num = vifi;
1007 #endif
1008 if (vifi + 1 > mrt->maxvif)
1009 mrt->maxvif = vifi + 1;
1010 write_unlock_bh(&mrt_lock);
1011 return 0;
1012 }
1013
1014 static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt,
1015 const struct in6_addr *origin,
1016 const struct in6_addr *mcastgrp)
1017 {
1018 int line = MFC6_HASH(mcastgrp, origin);
1019 struct mfc6_cache *c;
1020
1021 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1022 if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
1023 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
1024 return c;
1025 }
1026 return NULL;
1027 }
1028
1029 /* Look for a (*,*,oif) entry */
1030 static struct mfc6_cache *ip6mr_cache_find_any_parent(struct mr6_table *mrt,
1031 mifi_t mifi)
1032 {
1033 int line = MFC6_HASH(&in6addr_any, &in6addr_any);
1034 struct mfc6_cache *c;
1035
1036 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
1037 if (ipv6_addr_any(&c->mf6c_origin) &&
1038 ipv6_addr_any(&c->mf6c_mcastgrp) &&
1039 (c->mfc_un.res.ttls[mifi] < 255))
1040 return c;
1041
1042 return NULL;
1043 }
1044
1045 /* Look for a (*,G) entry */
1046 static struct mfc6_cache *ip6mr_cache_find_any(struct mr6_table *mrt,
1047 struct in6_addr *mcastgrp,
1048 mifi_t mifi)
1049 {
1050 int line = MFC6_HASH(mcastgrp, &in6addr_any);
1051 struct mfc6_cache *c, *proxy;
1052
1053 if (ipv6_addr_any(mcastgrp))
1054 goto skip;
1055
1056 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
1057 if (ipv6_addr_any(&c->mf6c_origin) &&
1058 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) {
1059 if (c->mfc_un.res.ttls[mifi] < 255)
1060 return c;
1061
1062 /* It's ok if the mifi is part of the static tree */
1063 proxy = ip6mr_cache_find_any_parent(mrt,
1064 c->mf6c_parent);
1065 if (proxy && proxy->mfc_un.res.ttls[mifi] < 255)
1066 return c;
1067 }
1068
1069 skip:
1070 return ip6mr_cache_find_any_parent(mrt, mifi);
1071 }
1072
1073 /*
1074 * Allocate a multicast cache entry
1075 */
1076 static struct mfc6_cache *ip6mr_cache_alloc(void)
1077 {
1078 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
1079 if (!c)
1080 return NULL;
1081 c->mfc_un.res.minvif = MAXMIFS;
1082 return c;
1083 }
1084
1085 static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
1086 {
1087 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
1088 if (!c)
1089 return NULL;
1090 skb_queue_head_init(&c->mfc_un.unres.unresolved);
1091 c->mfc_un.unres.expires = jiffies + 10 * HZ;
1092 return c;
1093 }
1094
1095 /*
1096 * A cache entry has gone into a resolved state from queued
1097 */
1098
1099 static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt,
1100 struct mfc6_cache *uc, struct mfc6_cache *c)
1101 {
1102 struct sk_buff *skb;
1103
1104 /*
1105 * Play the pending entries through our router
1106 */
1107
1108 while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
1109 if (ipv6_hdr(skb)->version == 0) {
1110 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
1111
1112 if (__ip6mr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
1113 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1114 } else {
1115 nlh->nlmsg_type = NLMSG_ERROR;
1116 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1117 skb_trim(skb, nlh->nlmsg_len);
1118 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
1119 }
1120 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1121 } else
1122 ip6_mr_forward(net, mrt, skb, c);
1123 }
1124 }
1125
1126 /*
1127 * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
1128 * expects the following bizarre scheme.
1129 *
1130 * Called under mrt_lock.
1131 */
1132
1133 static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
1134 mifi_t mifi, int assert)
1135 {
1136 struct sk_buff *skb;
1137 struct mrt6msg *msg;
1138 int ret;
1139
1140 #ifdef CONFIG_IPV6_PIMSM_V2
1141 if (assert == MRT6MSG_WHOLEPKT)
1142 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1143 +sizeof(*msg));
1144 else
1145 #endif
1146 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1147
1148 if (!skb)
1149 return -ENOBUFS;
1150
1151 /* I suppose that internal messages
1152 * do not require checksums */
1153
1154 skb->ip_summed = CHECKSUM_UNNECESSARY;
1155
1156 #ifdef CONFIG_IPV6_PIMSM_V2
1157 if (assert == MRT6MSG_WHOLEPKT) {
1158 /* Ugly, but we have no choice with this interface.
1159 Duplicate old header, fix length etc.
1160 And all this only to mangle msg->im6_msgtype and
1161 to set msg->im6_mbz to "mbz" :-)
1162 */
1163 skb_push(skb, -skb_network_offset(pkt));
1164
1165 skb_push(skb, sizeof(*msg));
1166 skb_reset_transport_header(skb);
1167 msg = (struct mrt6msg *)skb_transport_header(skb);
1168 msg->im6_mbz = 0;
1169 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
1170 msg->im6_mif = mrt->mroute_reg_vif_num;
1171 msg->im6_pad = 0;
1172 msg->im6_src = ipv6_hdr(pkt)->saddr;
1173 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1174
1175 skb->ip_summed = CHECKSUM_UNNECESSARY;
1176 } else
1177 #endif
1178 {
1179 /*
1180 * Copy the IP header
1181 */
1182
1183 skb_put(skb, sizeof(struct ipv6hdr));
1184 skb_reset_network_header(skb);
1185 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1186
1187 /*
1188 * Add our header
1189 */
1190 skb_put(skb, sizeof(*msg));
1191 skb_reset_transport_header(skb);
1192 msg = (struct mrt6msg *)skb_transport_header(skb);
1193
1194 msg->im6_mbz = 0;
1195 msg->im6_msgtype = assert;
1196 msg->im6_mif = mifi;
1197 msg->im6_pad = 0;
1198 msg->im6_src = ipv6_hdr(pkt)->saddr;
1199 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1200
1201 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1202 skb->ip_summed = CHECKSUM_UNNECESSARY;
1203 }
1204
1205 if (!mrt->mroute6_sk) {
1206 kfree_skb(skb);
1207 return -EINVAL;
1208 }
1209
1210 /*
1211 * Deliver to user space multicast routing algorithms
1212 */
1213 ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb);
1214 if (ret < 0) {
1215 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
1216 kfree_skb(skb);
1217 }
1218
1219 return ret;
1220 }
1221
1222 /*
1223 * Queue a packet for resolution. It gets locked cache entry!
1224 */
1225
1226 static int
1227 ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb)
1228 {
1229 bool found = false;
1230 int err;
1231 struct mfc6_cache *c;
1232
1233 spin_lock_bh(&mfc_unres_lock);
1234 list_for_each_entry(c, &mrt->mfc6_unres_queue, list) {
1235 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1236 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1237 found = true;
1238 break;
1239 }
1240 }
1241
1242 if (!found) {
1243 /*
1244 * Create a new entry if allowable
1245 */
1246
1247 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1248 (c = ip6mr_cache_alloc_unres()) == NULL) {
1249 spin_unlock_bh(&mfc_unres_lock);
1250
1251 kfree_skb(skb);
1252 return -ENOBUFS;
1253 }
1254
1255 /*
1256 * Fill in the new cache entry
1257 */
1258 c->mf6c_parent = -1;
1259 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1260 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1261
1262 /*
1263 * Reflect first query at pim6sd
1264 */
1265 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1266 if (err < 0) {
1267 /* If the report failed throw the cache entry
1268 out - Brad Parker
1269 */
1270 spin_unlock_bh(&mfc_unres_lock);
1271
1272 ip6mr_cache_free(c);
1273 kfree_skb(skb);
1274 return err;
1275 }
1276
1277 atomic_inc(&mrt->cache_resolve_queue_len);
1278 list_add(&c->list, &mrt->mfc6_unres_queue);
1279 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1280
1281 ipmr_do_expire_process(mrt);
1282 }
1283
1284 /*
1285 * See if we can append the packet
1286 */
1287 if (c->mfc_un.unres.unresolved.qlen > 3) {
1288 kfree_skb(skb);
1289 err = -ENOBUFS;
1290 } else {
1291 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1292 err = 0;
1293 }
1294
1295 spin_unlock_bh(&mfc_unres_lock);
1296 return err;
1297 }
1298
1299 /*
1300 * MFC6 cache manipulation by user space
1301 */
1302
1303 static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc,
1304 int parent)
1305 {
1306 int line;
1307 struct mfc6_cache *c, *next;
1308
1309 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1310
1311 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) {
1312 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1313 ipv6_addr_equal(&c->mf6c_mcastgrp,
1314 &mfc->mf6cc_mcastgrp.sin6_addr) &&
1315 (parent == -1 || parent == c->mf6c_parent)) {
1316 write_lock_bh(&mrt_lock);
1317 list_del(&c->list);
1318 write_unlock_bh(&mrt_lock);
1319
1320 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1321 ip6mr_cache_free(c);
1322 return 0;
1323 }
1324 }
1325 return -ENOENT;
1326 }
1327
1328 static int ip6mr_device_event(struct notifier_block *this,
1329 unsigned long event, void *ptr)
1330 {
1331 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1332 struct net *net = dev_net(dev);
1333 struct mr6_table *mrt;
1334 struct mif_device *v;
1335 int ct;
1336 LIST_HEAD(list);
1337
1338 if (event != NETDEV_UNREGISTER)
1339 return NOTIFY_DONE;
1340
1341 ip6mr_for_each_table(mrt, net) {
1342 v = &mrt->vif6_table[0];
1343 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1344 if (v->dev == dev)
1345 mif6_delete(mrt, ct, &list);
1346 }
1347 }
1348 unregister_netdevice_many(&list);
1349
1350 return NOTIFY_DONE;
1351 }
1352
1353 static struct notifier_block ip6_mr_notifier = {
1354 .notifier_call = ip6mr_device_event
1355 };
1356
1357 /*
1358 * Setup for IP multicast routing
1359 */
1360
1361 static int __net_init ip6mr_net_init(struct net *net)
1362 {
1363 int err;
1364
1365 err = ip6mr_rules_init(net);
1366 if (err < 0)
1367 goto fail;
1368
1369 #ifdef CONFIG_PROC_FS
1370 err = -ENOMEM;
1371 if (!proc_create("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_fops))
1372 goto proc_vif_fail;
1373 if (!proc_create("ip6_mr_cache", 0, net->proc_net, &ip6mr_mfc_fops))
1374 goto proc_cache_fail;
1375 #endif
1376
1377 return 0;
1378
1379 #ifdef CONFIG_PROC_FS
1380 proc_cache_fail:
1381 remove_proc_entry("ip6_mr_vif", net->proc_net);
1382 proc_vif_fail:
1383 ip6mr_rules_exit(net);
1384 #endif
1385 fail:
1386 return err;
1387 }
1388
1389 static void __net_exit ip6mr_net_exit(struct net *net)
1390 {
1391 #ifdef CONFIG_PROC_FS
1392 remove_proc_entry("ip6_mr_cache", net->proc_net);
1393 remove_proc_entry("ip6_mr_vif", net->proc_net);
1394 #endif
1395 ip6mr_rules_exit(net);
1396 }
1397
1398 static struct pernet_operations ip6mr_net_ops = {
1399 .init = ip6mr_net_init,
1400 .exit = ip6mr_net_exit,
1401 };
1402
1403 int __init ip6_mr_init(void)
1404 {
1405 int err;
1406
1407 mrt_cachep = kmem_cache_create("ip6_mrt_cache",
1408 sizeof(struct mfc6_cache),
1409 0, SLAB_HWCACHE_ALIGN,
1410 NULL);
1411 if (!mrt_cachep)
1412 return -ENOMEM;
1413
1414 err = register_pernet_subsys(&ip6mr_net_ops);
1415 if (err)
1416 goto reg_pernet_fail;
1417
1418 err = register_netdevice_notifier(&ip6_mr_notifier);
1419 if (err)
1420 goto reg_notif_fail;
1421 #ifdef CONFIG_IPV6_PIMSM_V2
1422 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1423 pr_err("%s: can't add PIM protocol\n", __func__);
1424 err = -EAGAIN;
1425 goto add_proto_fail;
1426 }
1427 #endif
1428 rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL,
1429 ip6mr_rtm_dumproute, NULL);
1430 return 0;
1431 #ifdef CONFIG_IPV6_PIMSM_V2
1432 add_proto_fail:
1433 unregister_netdevice_notifier(&ip6_mr_notifier);
1434 #endif
1435 reg_notif_fail:
1436 unregister_pernet_subsys(&ip6mr_net_ops);
1437 reg_pernet_fail:
1438 kmem_cache_destroy(mrt_cachep);
1439 return err;
1440 }
1441
1442 void ip6_mr_cleanup(void)
1443 {
1444 rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE);
1445 #ifdef CONFIG_IPV6_PIMSM_V2
1446 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
1447 #endif
1448 unregister_netdevice_notifier(&ip6_mr_notifier);
1449 unregister_pernet_subsys(&ip6mr_net_ops);
1450 kmem_cache_destroy(mrt_cachep);
1451 }
1452
1453 static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt,
1454 struct mf6cctl *mfc, int mrtsock, int parent)
1455 {
1456 bool found = false;
1457 int line;
1458 struct mfc6_cache *uc, *c;
1459 unsigned char ttls[MAXMIFS];
1460 int i;
1461
1462 if (mfc->mf6cc_parent >= MAXMIFS)
1463 return -ENFILE;
1464
1465 memset(ttls, 255, MAXMIFS);
1466 for (i = 0; i < MAXMIFS; i++) {
1467 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1468 ttls[i] = 1;
1469
1470 }
1471
1472 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1473
1474 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1475 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1476 ipv6_addr_equal(&c->mf6c_mcastgrp,
1477 &mfc->mf6cc_mcastgrp.sin6_addr) &&
1478 (parent == -1 || parent == mfc->mf6cc_parent)) {
1479 found = true;
1480 break;
1481 }
1482 }
1483
1484 if (found) {
1485 write_lock_bh(&mrt_lock);
1486 c->mf6c_parent = mfc->mf6cc_parent;
1487 ip6mr_update_thresholds(mrt, c, ttls);
1488 if (!mrtsock)
1489 c->mfc_flags |= MFC_STATIC;
1490 write_unlock_bh(&mrt_lock);
1491 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1492 return 0;
1493 }
1494
1495 if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
1496 !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1497 return -EINVAL;
1498
1499 c = ip6mr_cache_alloc();
1500 if (!c)
1501 return -ENOMEM;
1502
1503 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1504 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1505 c->mf6c_parent = mfc->mf6cc_parent;
1506 ip6mr_update_thresholds(mrt, c, ttls);
1507 if (!mrtsock)
1508 c->mfc_flags |= MFC_STATIC;
1509
1510 write_lock_bh(&mrt_lock);
1511 list_add(&c->list, &mrt->mfc6_cache_array[line]);
1512 write_unlock_bh(&mrt_lock);
1513
1514 /*
1515 * Check to see if we resolved a queued list. If so we
1516 * need to send on the frames and tidy up.
1517 */
1518 found = false;
1519 spin_lock_bh(&mfc_unres_lock);
1520 list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) {
1521 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1522 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1523 list_del(&uc->list);
1524 atomic_dec(&mrt->cache_resolve_queue_len);
1525 found = true;
1526 break;
1527 }
1528 }
1529 if (list_empty(&mrt->mfc6_unres_queue))
1530 del_timer(&mrt->ipmr_expire_timer);
1531 spin_unlock_bh(&mfc_unres_lock);
1532
1533 if (found) {
1534 ip6mr_cache_resolve(net, mrt, uc, c);
1535 ip6mr_cache_free(uc);
1536 }
1537 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1538 return 0;
1539 }
1540
1541 /*
1542 * Close the multicast socket, and clear the vif tables etc
1543 */
1544
1545 static void mroute_clean_tables(struct mr6_table *mrt)
1546 {
1547 int i;
1548 LIST_HEAD(list);
1549 struct mfc6_cache *c, *next;
1550
1551 /*
1552 * Shut down all active vif entries
1553 */
1554 for (i = 0; i < mrt->maxvif; i++) {
1555 if (!(mrt->vif6_table[i].flags & VIFF_STATIC))
1556 mif6_delete(mrt, i, &list);
1557 }
1558 unregister_netdevice_many(&list);
1559
1560 /*
1561 * Wipe the cache
1562 */
1563 for (i = 0; i < MFC6_LINES; i++) {
1564 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) {
1565 if (c->mfc_flags & MFC_STATIC)
1566 continue;
1567 write_lock_bh(&mrt_lock);
1568 list_del(&c->list);
1569 write_unlock_bh(&mrt_lock);
1570
1571 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1572 ip6mr_cache_free(c);
1573 }
1574 }
1575
1576 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1577 spin_lock_bh(&mfc_unres_lock);
1578 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
1579 list_del(&c->list);
1580 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1581 ip6mr_destroy_unres(mrt, c);
1582 }
1583 spin_unlock_bh(&mfc_unres_lock);
1584 }
1585 }
1586
1587 static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk)
1588 {
1589 int err = 0;
1590 struct net *net = sock_net(sk);
1591
1592 rtnl_lock();
1593 write_lock_bh(&mrt_lock);
1594 if (likely(mrt->mroute6_sk == NULL)) {
1595 mrt->mroute6_sk = sk;
1596 net->ipv6.devconf_all->mc_forwarding++;
1597 inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
1598 NETCONFA_IFINDEX_ALL,
1599 net->ipv6.devconf_all);
1600 }
1601 else
1602 err = -EADDRINUSE;
1603 write_unlock_bh(&mrt_lock);
1604
1605 rtnl_unlock();
1606
1607 return err;
1608 }
1609
1610 int ip6mr_sk_done(struct sock *sk)
1611 {
1612 int err = -EACCES;
1613 struct net *net = sock_net(sk);
1614 struct mr6_table *mrt;
1615
1616 rtnl_lock();
1617 ip6mr_for_each_table(mrt, net) {
1618 if (sk == mrt->mroute6_sk) {
1619 write_lock_bh(&mrt_lock);
1620 mrt->mroute6_sk = NULL;
1621 net->ipv6.devconf_all->mc_forwarding--;
1622 inet6_netconf_notify_devconf(net,
1623 NETCONFA_MC_FORWARDING,
1624 NETCONFA_IFINDEX_ALL,
1625 net->ipv6.devconf_all);
1626 write_unlock_bh(&mrt_lock);
1627
1628 mroute_clean_tables(mrt);
1629 err = 0;
1630 break;
1631 }
1632 }
1633 rtnl_unlock();
1634
1635 return err;
1636 }
1637
1638 struct sock *mroute6_socket(struct net *net, struct sk_buff *skb)
1639 {
1640 struct mr6_table *mrt;
1641 struct flowi6 fl6 = {
1642 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
1643 .flowi6_oif = skb->dev->ifindex,
1644 .flowi6_mark = skb->mark,
1645 };
1646
1647 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1648 return NULL;
1649
1650 return mrt->mroute6_sk;
1651 }
1652
1653 /*
1654 * Socket options and virtual interface manipulation. The whole
1655 * virtual interface system is a complete heap, but unfortunately
1656 * that's how BSD mrouted happens to think. Maybe one day with a proper
1657 * MOSPF/PIM router set up we can clean this up.
1658 */
1659
1660 int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1661 {
1662 int ret, parent = 0;
1663 struct mif6ctl vif;
1664 struct mf6cctl mfc;
1665 mifi_t mifi;
1666 struct net *net = sock_net(sk);
1667 struct mr6_table *mrt;
1668
1669 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1670 if (!mrt)
1671 return -ENOENT;
1672
1673 if (optname != MRT6_INIT) {
1674 if (sk != mrt->mroute6_sk && !ns_capable(net->user_ns, CAP_NET_ADMIN))
1675 return -EACCES;
1676 }
1677
1678 switch (optname) {
1679 case MRT6_INIT:
1680 if (sk->sk_type != SOCK_RAW ||
1681 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1682 return -EOPNOTSUPP;
1683 if (optlen < sizeof(int))
1684 return -EINVAL;
1685
1686 return ip6mr_sk_init(mrt, sk);
1687
1688 case MRT6_DONE:
1689 return ip6mr_sk_done(sk);
1690
1691 case MRT6_ADD_MIF:
1692 if (optlen < sizeof(vif))
1693 return -EINVAL;
1694 if (copy_from_user(&vif, optval, sizeof(vif)))
1695 return -EFAULT;
1696 if (vif.mif6c_mifi >= MAXMIFS)
1697 return -ENFILE;
1698 rtnl_lock();
1699 ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk);
1700 rtnl_unlock();
1701 return ret;
1702
1703 case MRT6_DEL_MIF:
1704 if (optlen < sizeof(mifi_t))
1705 return -EINVAL;
1706 if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
1707 return -EFAULT;
1708 rtnl_lock();
1709 ret = mif6_delete(mrt, mifi, NULL);
1710 rtnl_unlock();
1711 return ret;
1712
1713 /*
1714 * Manipulate the forwarding caches. These live
1715 * in a sort of kernel/user symbiosis.
1716 */
1717 case MRT6_ADD_MFC:
1718 case MRT6_DEL_MFC:
1719 parent = -1;
1720 case MRT6_ADD_MFC_PROXY:
1721 case MRT6_DEL_MFC_PROXY:
1722 if (optlen < sizeof(mfc))
1723 return -EINVAL;
1724 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1725 return -EFAULT;
1726 if (parent == 0)
1727 parent = mfc.mf6cc_parent;
1728 rtnl_lock();
1729 if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
1730 ret = ip6mr_mfc_delete(mrt, &mfc, parent);
1731 else
1732 ret = ip6mr_mfc_add(net, mrt, &mfc,
1733 sk == mrt->mroute6_sk, parent);
1734 rtnl_unlock();
1735 return ret;
1736
1737 /*
1738 * Control PIM assert (to activate pim will activate assert)
1739 */
1740 case MRT6_ASSERT:
1741 {
1742 int v;
1743
1744 if (optlen != sizeof(v))
1745 return -EINVAL;
1746 if (get_user(v, (int __user *)optval))
1747 return -EFAULT;
1748 mrt->mroute_do_assert = v;
1749 return 0;
1750 }
1751
1752 #ifdef CONFIG_IPV6_PIMSM_V2
1753 case MRT6_PIM:
1754 {
1755 int v;
1756
1757 if (optlen != sizeof(v))
1758 return -EINVAL;
1759 if (get_user(v, (int __user *)optval))
1760 return -EFAULT;
1761 v = !!v;
1762 rtnl_lock();
1763 ret = 0;
1764 if (v != mrt->mroute_do_pim) {
1765 mrt->mroute_do_pim = v;
1766 mrt->mroute_do_assert = v;
1767 }
1768 rtnl_unlock();
1769 return ret;
1770 }
1771
1772 #endif
1773 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1774 case MRT6_TABLE:
1775 {
1776 u32 v;
1777
1778 if (optlen != sizeof(u32))
1779 return -EINVAL;
1780 if (get_user(v, (u32 __user *)optval))
1781 return -EFAULT;
1782 /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
1783 if (v != RT_TABLE_DEFAULT && v >= 100000000)
1784 return -EINVAL;
1785 if (sk == mrt->mroute6_sk)
1786 return -EBUSY;
1787
1788 rtnl_lock();
1789 ret = 0;
1790 if (!ip6mr_new_table(net, v))
1791 ret = -ENOMEM;
1792 raw6_sk(sk)->ip6mr_table = v;
1793 rtnl_unlock();
1794 return ret;
1795 }
1796 #endif
1797 /*
1798 * Spurious command, or MRT6_VERSION which you cannot
1799 * set.
1800 */
1801 default:
1802 return -ENOPROTOOPT;
1803 }
1804 }
1805
1806 /*
1807 * Getsock opt support for the multicast routing system.
1808 */
1809
1810 int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1811 int __user *optlen)
1812 {
1813 int olr;
1814 int val;
1815 struct net *net = sock_net(sk);
1816 struct mr6_table *mrt;
1817
1818 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1819 if (!mrt)
1820 return -ENOENT;
1821
1822 switch (optname) {
1823 case MRT6_VERSION:
1824 val = 0x0305;
1825 break;
1826 #ifdef CONFIG_IPV6_PIMSM_V2
1827 case MRT6_PIM:
1828 val = mrt->mroute_do_pim;
1829 break;
1830 #endif
1831 case MRT6_ASSERT:
1832 val = mrt->mroute_do_assert;
1833 break;
1834 default:
1835 return -ENOPROTOOPT;
1836 }
1837
1838 if (get_user(olr, optlen))
1839 return -EFAULT;
1840
1841 olr = min_t(int, olr, sizeof(int));
1842 if (olr < 0)
1843 return -EINVAL;
1844
1845 if (put_user(olr, optlen))
1846 return -EFAULT;
1847 if (copy_to_user(optval, &val, olr))
1848 return -EFAULT;
1849 return 0;
1850 }
1851
1852 /*
1853 * The IP multicast ioctl support routines.
1854 */
1855
1856 int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1857 {
1858 struct sioc_sg_req6 sr;
1859 struct sioc_mif_req6 vr;
1860 struct mif_device *vif;
1861 struct mfc6_cache *c;
1862 struct net *net = sock_net(sk);
1863 struct mr6_table *mrt;
1864
1865 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1866 if (!mrt)
1867 return -ENOENT;
1868
1869 switch (cmd) {
1870 case SIOCGETMIFCNT_IN6:
1871 if (copy_from_user(&vr, arg, sizeof(vr)))
1872 return -EFAULT;
1873 if (vr.mifi >= mrt->maxvif)
1874 return -EINVAL;
1875 read_lock(&mrt_lock);
1876 vif = &mrt->vif6_table[vr.mifi];
1877 if (MIF_EXISTS(mrt, vr.mifi)) {
1878 vr.icount = vif->pkt_in;
1879 vr.ocount = vif->pkt_out;
1880 vr.ibytes = vif->bytes_in;
1881 vr.obytes = vif->bytes_out;
1882 read_unlock(&mrt_lock);
1883
1884 if (copy_to_user(arg, &vr, sizeof(vr)))
1885 return -EFAULT;
1886 return 0;
1887 }
1888 read_unlock(&mrt_lock);
1889 return -EADDRNOTAVAIL;
1890 case SIOCGETSGCNT_IN6:
1891 if (copy_from_user(&sr, arg, sizeof(sr)))
1892 return -EFAULT;
1893
1894 read_lock(&mrt_lock);
1895 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1896 if (c) {
1897 sr.pktcnt = c->mfc_un.res.pkt;
1898 sr.bytecnt = c->mfc_un.res.bytes;
1899 sr.wrong_if = c->mfc_un.res.wrong_if;
1900 read_unlock(&mrt_lock);
1901
1902 if (copy_to_user(arg, &sr, sizeof(sr)))
1903 return -EFAULT;
1904 return 0;
1905 }
1906 read_unlock(&mrt_lock);
1907 return -EADDRNOTAVAIL;
1908 default:
1909 return -ENOIOCTLCMD;
1910 }
1911 }
1912
1913 #ifdef CONFIG_COMPAT
1914 struct compat_sioc_sg_req6 {
1915 struct sockaddr_in6 src;
1916 struct sockaddr_in6 grp;
1917 compat_ulong_t pktcnt;
1918 compat_ulong_t bytecnt;
1919 compat_ulong_t wrong_if;
1920 };
1921
1922 struct compat_sioc_mif_req6 {
1923 mifi_t mifi;
1924 compat_ulong_t icount;
1925 compat_ulong_t ocount;
1926 compat_ulong_t ibytes;
1927 compat_ulong_t obytes;
1928 };
1929
1930 int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1931 {
1932 struct compat_sioc_sg_req6 sr;
1933 struct compat_sioc_mif_req6 vr;
1934 struct mif_device *vif;
1935 struct mfc6_cache *c;
1936 struct net *net = sock_net(sk);
1937 struct mr6_table *mrt;
1938
1939 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1940 if (!mrt)
1941 return -ENOENT;
1942
1943 switch (cmd) {
1944 case SIOCGETMIFCNT_IN6:
1945 if (copy_from_user(&vr, arg, sizeof(vr)))
1946 return -EFAULT;
1947 if (vr.mifi >= mrt->maxvif)
1948 return -EINVAL;
1949 read_lock(&mrt_lock);
1950 vif = &mrt->vif6_table[vr.mifi];
1951 if (MIF_EXISTS(mrt, vr.mifi)) {
1952 vr.icount = vif->pkt_in;
1953 vr.ocount = vif->pkt_out;
1954 vr.ibytes = vif->bytes_in;
1955 vr.obytes = vif->bytes_out;
1956 read_unlock(&mrt_lock);
1957
1958 if (copy_to_user(arg, &vr, sizeof(vr)))
1959 return -EFAULT;
1960 return 0;
1961 }
1962 read_unlock(&mrt_lock);
1963 return -EADDRNOTAVAIL;
1964 case SIOCGETSGCNT_IN6:
1965 if (copy_from_user(&sr, arg, sizeof(sr)))
1966 return -EFAULT;
1967
1968 read_lock(&mrt_lock);
1969 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1970 if (c) {
1971 sr.pktcnt = c->mfc_un.res.pkt;
1972 sr.bytecnt = c->mfc_un.res.bytes;
1973 sr.wrong_if = c->mfc_un.res.wrong_if;
1974 read_unlock(&mrt_lock);
1975
1976 if (copy_to_user(arg, &sr, sizeof(sr)))
1977 return -EFAULT;
1978 return 0;
1979 }
1980 read_unlock(&mrt_lock);
1981 return -EADDRNOTAVAIL;
1982 default:
1983 return -ENOIOCTLCMD;
1984 }
1985 }
1986 #endif
1987
1988 static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
1989 {
1990 IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
1991 IPSTATS_MIB_OUTFORWDATAGRAMS);
1992 IP6_ADD_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
1993 IPSTATS_MIB_OUTOCTETS, skb->len);
1994 return dst_output(sk, skb);
1995 }
1996
1997 /*
1998 * Processing handlers for ip6mr_forward
1999 */
2000
2001 static int ip6mr_forward2(struct net *net, struct mr6_table *mrt,
2002 struct sk_buff *skb, struct mfc6_cache *c, int vifi)
2003 {
2004 struct ipv6hdr *ipv6h;
2005 struct mif_device *vif = &mrt->vif6_table[vifi];
2006 struct net_device *dev;
2007 struct dst_entry *dst;
2008 struct flowi6 fl6;
2009
2010 if (!vif->dev)
2011 goto out_free;
2012
2013 #ifdef CONFIG_IPV6_PIMSM_V2
2014 if (vif->flags & MIFF_REGISTER) {
2015 vif->pkt_out++;
2016 vif->bytes_out += skb->len;
2017 vif->dev->stats.tx_bytes += skb->len;
2018 vif->dev->stats.tx_packets++;
2019 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
2020 goto out_free;
2021 }
2022 #endif
2023
2024 ipv6h = ipv6_hdr(skb);
2025
2026 fl6 = (struct flowi6) {
2027 .flowi6_oif = vif->link,
2028 .daddr = ipv6h->daddr,
2029 };
2030
2031 dst = ip6_route_output(net, NULL, &fl6);
2032 if (dst->error) {
2033 dst_release(dst);
2034 goto out_free;
2035 }
2036
2037 skb_dst_drop(skb);
2038 skb_dst_set(skb, dst);
2039
2040 /*
2041 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
2042 * not only before forwarding, but after forwarding on all output
2043 * interfaces. It is clear, if mrouter runs a multicasting
2044 * program, it should receive packets not depending to what interface
2045 * program is joined.
2046 * If we will not make it, the program will have to join on all
2047 * interfaces. On the other hand, multihoming host (or router, but
2048 * not mrouter) cannot join to more than one interface - it will
2049 * result in receiving multiple packets.
2050 */
2051 dev = vif->dev;
2052 skb->dev = dev;
2053 vif->pkt_out++;
2054 vif->bytes_out += skb->len;
2055
2056 /* We are about to write */
2057 /* XXX: extension headers? */
2058 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
2059 goto out_free;
2060
2061 ipv6h = ipv6_hdr(skb);
2062 ipv6h->hop_limit--;
2063
2064 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
2065
2066 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
2067 net, NULL, skb, skb->dev, dev,
2068 ip6mr_forward2_finish);
2069
2070 out_free:
2071 kfree_skb(skb);
2072 return 0;
2073 }
2074
2075 static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev)
2076 {
2077 int ct;
2078
2079 for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
2080 if (mrt->vif6_table[ct].dev == dev)
2081 break;
2082 }
2083 return ct;
2084 }
2085
2086 static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
2087 struct sk_buff *skb, struct mfc6_cache *cache)
2088 {
2089 int psend = -1;
2090 int vif, ct;
2091 int true_vifi = ip6mr_find_vif(mrt, skb->dev);
2092
2093 vif = cache->mf6c_parent;
2094 cache->mfc_un.res.pkt++;
2095 cache->mfc_un.res.bytes += skb->len;
2096
2097 if (ipv6_addr_any(&cache->mf6c_origin) && true_vifi >= 0) {
2098 struct mfc6_cache *cache_proxy;
2099
2100 /* For an (*,G) entry, we only check that the incoming
2101 * interface is part of the static tree.
2102 */
2103 cache_proxy = ip6mr_cache_find_any_parent(mrt, vif);
2104 if (cache_proxy &&
2105 cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
2106 goto forward;
2107 }
2108
2109 /*
2110 * Wrong interface: drop packet and (maybe) send PIM assert.
2111 */
2112 if (mrt->vif6_table[vif].dev != skb->dev) {
2113 cache->mfc_un.res.wrong_if++;
2114
2115 if (true_vifi >= 0 && mrt->mroute_do_assert &&
2116 /* pimsm uses asserts, when switching from RPT to SPT,
2117 so that we cannot check that packet arrived on an oif.
2118 It is bad, but otherwise we would need to move pretty
2119 large chunk of pimd to kernel. Ough... --ANK
2120 */
2121 (mrt->mroute_do_pim ||
2122 cache->mfc_un.res.ttls[true_vifi] < 255) &&
2123 time_after(jiffies,
2124 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
2125 cache->mfc_un.res.last_assert = jiffies;
2126 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2127 }
2128 goto dont_forward;
2129 }
2130
2131 forward:
2132 mrt->vif6_table[vif].pkt_in++;
2133 mrt->vif6_table[vif].bytes_in += skb->len;
2134
2135 /*
2136 * Forward the frame
2137 */
2138 if (ipv6_addr_any(&cache->mf6c_origin) &&
2139 ipv6_addr_any(&cache->mf6c_mcastgrp)) {
2140 if (true_vifi >= 0 &&
2141 true_vifi != cache->mf6c_parent &&
2142 ipv6_hdr(skb)->hop_limit >
2143 cache->mfc_un.res.ttls[cache->mf6c_parent]) {
2144 /* It's an (*,*) entry and the packet is not coming from
2145 * the upstream: forward the packet to the upstream
2146 * only.
2147 */
2148 psend = cache->mf6c_parent;
2149 goto last_forward;
2150 }
2151 goto dont_forward;
2152 }
2153 for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
2154 /* For (*,G) entry, don't forward to the incoming interface */
2155 if ((!ipv6_addr_any(&cache->mf6c_origin) || ct != true_vifi) &&
2156 ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
2157 if (psend != -1) {
2158 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2159 if (skb2)
2160 ip6mr_forward2(net, mrt, skb2, cache, psend);
2161 }
2162 psend = ct;
2163 }
2164 }
2165 last_forward:
2166 if (psend != -1) {
2167 ip6mr_forward2(net, mrt, skb, cache, psend);
2168 return;
2169 }
2170
2171 dont_forward:
2172 kfree_skb(skb);
2173 }
2174
2175
2176 /*
2177 * Multicast packets for forwarding arrive here
2178 */
2179
2180 int ip6_mr_input(struct sk_buff *skb)
2181 {
2182 struct mfc6_cache *cache;
2183 struct net *net = dev_net(skb->dev);
2184 struct mr6_table *mrt;
2185 struct flowi6 fl6 = {
2186 .flowi6_iif = skb->dev->ifindex,
2187 .flowi6_mark = skb->mark,
2188 };
2189 int err;
2190
2191 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2192 if (err < 0) {
2193 kfree_skb(skb);
2194 return err;
2195 }
2196
2197 read_lock(&mrt_lock);
2198 cache = ip6mr_cache_find(mrt,
2199 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2200 if (!cache) {
2201 int vif = ip6mr_find_vif(mrt, skb->dev);
2202
2203 if (vif >= 0)
2204 cache = ip6mr_cache_find_any(mrt,
2205 &ipv6_hdr(skb)->daddr,
2206 vif);
2207 }
2208
2209 /*
2210 * No usable cache entry
2211 */
2212 if (!cache) {
2213 int vif;
2214
2215 vif = ip6mr_find_vif(mrt, skb->dev);
2216 if (vif >= 0) {
2217 int err = ip6mr_cache_unresolved(mrt, vif, skb);
2218 read_unlock(&mrt_lock);
2219
2220 return err;
2221 }
2222 read_unlock(&mrt_lock);
2223 kfree_skb(skb);
2224 return -ENODEV;
2225 }
2226
2227 ip6_mr_forward(net, mrt, skb, cache);
2228
2229 read_unlock(&mrt_lock);
2230
2231 return 0;
2232 }
2233
2234
2235 static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2236 struct mfc6_cache *c, struct rtmsg *rtm)
2237 {
2238 int ct;
2239 struct rtnexthop *nhp;
2240 struct nlattr *mp_attr;
2241 struct rta_mfc_stats mfcs;
2242
2243 /* If cache is unresolved, don't try to parse IIF and OIF */
2244 if (c->mf6c_parent >= MAXMIFS)
2245 return -ENOENT;
2246
2247 if (MIF_EXISTS(mrt, c->mf6c_parent) &&
2248 nla_put_u32(skb, RTA_IIF, mrt->vif6_table[c->mf6c_parent].dev->ifindex) < 0)
2249 return -EMSGSIZE;
2250 mp_attr = nla_nest_start(skb, RTA_MULTIPATH);
2251 if (!mp_attr)
2252 return -EMSGSIZE;
2253
2254 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2255 if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2256 nhp = nla_reserve_nohdr(skb, sizeof(*nhp));
2257 if (!nhp) {
2258 nla_nest_cancel(skb, mp_attr);
2259 return -EMSGSIZE;
2260 }
2261
2262 nhp->rtnh_flags = 0;
2263 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2264 nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex;
2265 nhp->rtnh_len = sizeof(*nhp);
2266 }
2267 }
2268
2269 nla_nest_end(skb, mp_attr);
2270
2271 mfcs.mfcs_packets = c->mfc_un.res.pkt;
2272 mfcs.mfcs_bytes = c->mfc_un.res.bytes;
2273 mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
2274 if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0)
2275 return -EMSGSIZE;
2276
2277 rtm->rtm_type = RTN_MULTICAST;
2278 return 1;
2279 }
2280
2281 int ip6mr_get_route(struct net *net,
2282 struct sk_buff *skb, struct rtmsg *rtm, int nowait)
2283 {
2284 int err;
2285 struct mr6_table *mrt;
2286 struct mfc6_cache *cache;
2287 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
2288
2289 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2290 if (!mrt)
2291 return -ENOENT;
2292
2293 read_lock(&mrt_lock);
2294 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2295 if (!cache && skb->dev) {
2296 int vif = ip6mr_find_vif(mrt, skb->dev);
2297
2298 if (vif >= 0)
2299 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
2300 vif);
2301 }
2302
2303 if (!cache) {
2304 struct sk_buff *skb2;
2305 struct ipv6hdr *iph;
2306 struct net_device *dev;
2307 int vif;
2308
2309 if (nowait) {
2310 read_unlock(&mrt_lock);
2311 return -EAGAIN;
2312 }
2313
2314 dev = skb->dev;
2315 if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2316 read_unlock(&mrt_lock);
2317 return -ENODEV;
2318 }
2319
2320 /* really correct? */
2321 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2322 if (!skb2) {
2323 read_unlock(&mrt_lock);
2324 return -ENOMEM;
2325 }
2326
2327 skb_reset_transport_header(skb2);
2328
2329 skb_put(skb2, sizeof(struct ipv6hdr));
2330 skb_reset_network_header(skb2);
2331
2332 iph = ipv6_hdr(skb2);
2333 iph->version = 0;
2334 iph->priority = 0;
2335 iph->flow_lbl[0] = 0;
2336 iph->flow_lbl[1] = 0;
2337 iph->flow_lbl[2] = 0;
2338 iph->payload_len = 0;
2339 iph->nexthdr = IPPROTO_NONE;
2340 iph->hop_limit = 0;
2341 iph->saddr = rt->rt6i_src.addr;
2342 iph->daddr = rt->rt6i_dst.addr;
2343
2344 err = ip6mr_cache_unresolved(mrt, vif, skb2);
2345 read_unlock(&mrt_lock);
2346
2347 return err;
2348 }
2349
2350 if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
2351 cache->mfc_flags |= MFC_NOTIFY;
2352
2353 err = __ip6mr_fill_mroute(mrt, skb, cache, rtm);
2354 read_unlock(&mrt_lock);
2355 return err;
2356 }
2357
2358 static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2359 u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
2360 int flags)
2361 {
2362 struct nlmsghdr *nlh;
2363 struct rtmsg *rtm;
2364 int err;
2365
2366 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2367 if (!nlh)
2368 return -EMSGSIZE;
2369
2370 rtm = nlmsg_data(nlh);
2371 rtm->rtm_family = RTNL_FAMILY_IP6MR;
2372 rtm->rtm_dst_len = 128;
2373 rtm->rtm_src_len = 128;
2374 rtm->rtm_tos = 0;
2375 rtm->rtm_table = mrt->id;
2376 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2377 goto nla_put_failure;
2378 rtm->rtm_type = RTN_MULTICAST;
2379 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2380 if (c->mfc_flags & MFC_STATIC)
2381 rtm->rtm_protocol = RTPROT_STATIC;
2382 else
2383 rtm->rtm_protocol = RTPROT_MROUTED;
2384 rtm->rtm_flags = 0;
2385
2386 if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) ||
2387 nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp))
2388 goto nla_put_failure;
2389 err = __ip6mr_fill_mroute(mrt, skb, c, rtm);
2390 /* do not break the dump if cache is unresolved */
2391 if (err < 0 && err != -ENOENT)
2392 goto nla_put_failure;
2393
2394 nlmsg_end(skb, nlh);
2395 return 0;
2396
2397 nla_put_failure:
2398 nlmsg_cancel(skb, nlh);
2399 return -EMSGSIZE;
2400 }
2401
2402 static int mr6_msgsize(bool unresolved, int maxvif)
2403 {
2404 size_t len =
2405 NLMSG_ALIGN(sizeof(struct rtmsg))
2406 + nla_total_size(4) /* RTA_TABLE */
2407 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
2408 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
2409 ;
2410
2411 if (!unresolved)
2412 len = len
2413 + nla_total_size(4) /* RTA_IIF */
2414 + nla_total_size(0) /* RTA_MULTIPATH */
2415 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2416 /* RTA_MFC_STATS */
2417 + nla_total_size(sizeof(struct rta_mfc_stats))
2418 ;
2419
2420 return len;
2421 }
2422
2423 static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
2424 int cmd)
2425 {
2426 struct net *net = read_pnet(&mrt->net);
2427 struct sk_buff *skb;
2428 int err = -ENOBUFS;
2429
2430 skb = nlmsg_new(mr6_msgsize(mfc->mf6c_parent >= MAXMIFS, mrt->maxvif),
2431 GFP_ATOMIC);
2432 if (!skb)
2433 goto errout;
2434
2435 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2436 if (err < 0)
2437 goto errout;
2438
2439 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
2440 return;
2441
2442 errout:
2443 kfree_skb(skb);
2444 if (err < 0)
2445 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
2446 }
2447
2448 static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2449 {
2450 struct net *net = sock_net(skb->sk);
2451 struct mr6_table *mrt;
2452 struct mfc6_cache *mfc;
2453 unsigned int t = 0, s_t;
2454 unsigned int h = 0, s_h;
2455 unsigned int e = 0, s_e;
2456
2457 s_t = cb->args[0];
2458 s_h = cb->args[1];
2459 s_e = cb->args[2];
2460
2461 read_lock(&mrt_lock);
2462 ip6mr_for_each_table(mrt, net) {
2463 if (t < s_t)
2464 goto next_table;
2465 if (t > s_t)
2466 s_h = 0;
2467 for (h = s_h; h < MFC6_LINES; h++) {
2468 list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) {
2469 if (e < s_e)
2470 goto next_entry;
2471 if (ip6mr_fill_mroute(mrt, skb,
2472 NETLINK_CB(cb->skb).portid,
2473 cb->nlh->nlmsg_seq,
2474 mfc, RTM_NEWROUTE,
2475 NLM_F_MULTI) < 0)
2476 goto done;
2477 next_entry:
2478 e++;
2479 }
2480 e = s_e = 0;
2481 }
2482 spin_lock_bh(&mfc_unres_lock);
2483 list_for_each_entry(mfc, &mrt->mfc6_unres_queue, list) {
2484 if (e < s_e)
2485 goto next_entry2;
2486 if (ip6mr_fill_mroute(mrt, skb,
2487 NETLINK_CB(cb->skb).portid,
2488 cb->nlh->nlmsg_seq,
2489 mfc, RTM_NEWROUTE,
2490 NLM_F_MULTI) < 0) {
2491 spin_unlock_bh(&mfc_unres_lock);
2492 goto done;
2493 }
2494 next_entry2:
2495 e++;
2496 }
2497 spin_unlock_bh(&mfc_unres_lock);
2498 e = s_e = 0;
2499 s_h = 0;
2500 next_table:
2501 t++;
2502 }
2503 done:
2504 read_unlock(&mrt_lock);
2505
2506 cb->args[2] = e;
2507 cb->args[1] = h;
2508 cb->args[0] = t;
2509
2510 return skb->len;
2511 }
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