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ipv4: do not abuse GFP_ATOMIC in inet_netconf_notify_devconf()
[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, 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.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
1078 c->mfc_un.res.minvif = MAXMIFS;
1079 return c;
1080 }
1081
1082 static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
1083 {
1084 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
1085 if (!c)
1086 return NULL;
1087 skb_queue_head_init(&c->mfc_un.unres.unresolved);
1088 c->mfc_un.unres.expires = jiffies + 10 * HZ;
1089 return c;
1090 }
1091
1092 /*
1093 * A cache entry has gone into a resolved state from queued
1094 */
1095
1096 static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt,
1097 struct mfc6_cache *uc, struct mfc6_cache *c)
1098 {
1099 struct sk_buff *skb;
1100
1101 /*
1102 * Play the pending entries through our router
1103 */
1104
1105 while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
1106 if (ipv6_hdr(skb)->version == 0) {
1107 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
1108
1109 if (__ip6mr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
1110 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1111 } else {
1112 nlh->nlmsg_type = NLMSG_ERROR;
1113 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1114 skb_trim(skb, nlh->nlmsg_len);
1115 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
1116 }
1117 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1118 } else
1119 ip6_mr_forward(net, mrt, skb, c);
1120 }
1121 }
1122
1123 /*
1124 * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
1125 * expects the following bizarre scheme.
1126 *
1127 * Called under mrt_lock.
1128 */
1129
1130 static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
1131 mifi_t mifi, int assert)
1132 {
1133 struct sk_buff *skb;
1134 struct mrt6msg *msg;
1135 int ret;
1136
1137 #ifdef CONFIG_IPV6_PIMSM_V2
1138 if (assert == MRT6MSG_WHOLEPKT)
1139 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1140 +sizeof(*msg));
1141 else
1142 #endif
1143 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1144
1145 if (!skb)
1146 return -ENOBUFS;
1147
1148 /* I suppose that internal messages
1149 * do not require checksums */
1150
1151 skb->ip_summed = CHECKSUM_UNNECESSARY;
1152
1153 #ifdef CONFIG_IPV6_PIMSM_V2
1154 if (assert == MRT6MSG_WHOLEPKT) {
1155 /* Ugly, but we have no choice with this interface.
1156 Duplicate old header, fix length etc.
1157 And all this only to mangle msg->im6_msgtype and
1158 to set msg->im6_mbz to "mbz" :-)
1159 */
1160 skb_push(skb, -skb_network_offset(pkt));
1161
1162 skb_push(skb, sizeof(*msg));
1163 skb_reset_transport_header(skb);
1164 msg = (struct mrt6msg *)skb_transport_header(skb);
1165 msg->im6_mbz = 0;
1166 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
1167 msg->im6_mif = mrt->mroute_reg_vif_num;
1168 msg->im6_pad = 0;
1169 msg->im6_src = ipv6_hdr(pkt)->saddr;
1170 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1171
1172 skb->ip_summed = CHECKSUM_UNNECESSARY;
1173 } else
1174 #endif
1175 {
1176 /*
1177 * Copy the IP header
1178 */
1179
1180 skb_put(skb, sizeof(struct ipv6hdr));
1181 skb_reset_network_header(skb);
1182 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1183
1184 /*
1185 * Add our header
1186 */
1187 skb_put(skb, sizeof(*msg));
1188 skb_reset_transport_header(skb);
1189 msg = (struct mrt6msg *)skb_transport_header(skb);
1190
1191 msg->im6_mbz = 0;
1192 msg->im6_msgtype = assert;
1193 msg->im6_mif = mifi;
1194 msg->im6_pad = 0;
1195 msg->im6_src = ipv6_hdr(pkt)->saddr;
1196 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1197
1198 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1199 skb->ip_summed = CHECKSUM_UNNECESSARY;
1200 }
1201
1202 if (!mrt->mroute6_sk) {
1203 kfree_skb(skb);
1204 return -EINVAL;
1205 }
1206
1207 /*
1208 * Deliver to user space multicast routing algorithms
1209 */
1210 ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb);
1211 if (ret < 0) {
1212 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
1213 kfree_skb(skb);
1214 }
1215
1216 return ret;
1217 }
1218
1219 /*
1220 * Queue a packet for resolution. It gets locked cache entry!
1221 */
1222
1223 static int
1224 ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb)
1225 {
1226 bool found = false;
1227 int err;
1228 struct mfc6_cache *c;
1229
1230 spin_lock_bh(&mfc_unres_lock);
1231 list_for_each_entry(c, &mrt->mfc6_unres_queue, list) {
1232 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1233 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1234 found = true;
1235 break;
1236 }
1237 }
1238
1239 if (!found) {
1240 /*
1241 * Create a new entry if allowable
1242 */
1243
1244 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1245 (c = ip6mr_cache_alloc_unres()) == NULL) {
1246 spin_unlock_bh(&mfc_unres_lock);
1247
1248 kfree_skb(skb);
1249 return -ENOBUFS;
1250 }
1251
1252 /*
1253 * Fill in the new cache entry
1254 */
1255 c->mf6c_parent = -1;
1256 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1257 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1258
1259 /*
1260 * Reflect first query at pim6sd
1261 */
1262 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1263 if (err < 0) {
1264 /* If the report failed throw the cache entry
1265 out - Brad Parker
1266 */
1267 spin_unlock_bh(&mfc_unres_lock);
1268
1269 ip6mr_cache_free(c);
1270 kfree_skb(skb);
1271 return err;
1272 }
1273
1274 atomic_inc(&mrt->cache_resolve_queue_len);
1275 list_add(&c->list, &mrt->mfc6_unres_queue);
1276 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1277
1278 ipmr_do_expire_process(mrt);
1279 }
1280
1281 /*
1282 * See if we can append the packet
1283 */
1284 if (c->mfc_un.unres.unresolved.qlen > 3) {
1285 kfree_skb(skb);
1286 err = -ENOBUFS;
1287 } else {
1288 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1289 err = 0;
1290 }
1291
1292 spin_unlock_bh(&mfc_unres_lock);
1293 return err;
1294 }
1295
1296 /*
1297 * MFC6 cache manipulation by user space
1298 */
1299
1300 static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc,
1301 int parent)
1302 {
1303 int line;
1304 struct mfc6_cache *c, *next;
1305
1306 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1307
1308 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) {
1309 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1310 ipv6_addr_equal(&c->mf6c_mcastgrp,
1311 &mfc->mf6cc_mcastgrp.sin6_addr) &&
1312 (parent == -1 || parent == c->mf6c_parent)) {
1313 write_lock_bh(&mrt_lock);
1314 list_del(&c->list);
1315 write_unlock_bh(&mrt_lock);
1316
1317 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1318 ip6mr_cache_free(c);
1319 return 0;
1320 }
1321 }
1322 return -ENOENT;
1323 }
1324
1325 static int ip6mr_device_event(struct notifier_block *this,
1326 unsigned long event, void *ptr)
1327 {
1328 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1329 struct net *net = dev_net(dev);
1330 struct mr6_table *mrt;
1331 struct mif_device *v;
1332 int ct;
1333 LIST_HEAD(list);
1334
1335 if (event != NETDEV_UNREGISTER)
1336 return NOTIFY_DONE;
1337
1338 ip6mr_for_each_table(mrt, net) {
1339 v = &mrt->vif6_table[0];
1340 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1341 if (v->dev == dev)
1342 mif6_delete(mrt, ct, &list);
1343 }
1344 }
1345 unregister_netdevice_many(&list);
1346
1347 return NOTIFY_DONE;
1348 }
1349
1350 static struct notifier_block ip6_mr_notifier = {
1351 .notifier_call = ip6mr_device_event
1352 };
1353
1354 /*
1355 * Setup for IP multicast routing
1356 */
1357
1358 static int __net_init ip6mr_net_init(struct net *net)
1359 {
1360 int err;
1361
1362 err = ip6mr_rules_init(net);
1363 if (err < 0)
1364 goto fail;
1365
1366 #ifdef CONFIG_PROC_FS
1367 err = -ENOMEM;
1368 if (!proc_create("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_fops))
1369 goto proc_vif_fail;
1370 if (!proc_create("ip6_mr_cache", 0, net->proc_net, &ip6mr_mfc_fops))
1371 goto proc_cache_fail;
1372 #endif
1373
1374 return 0;
1375
1376 #ifdef CONFIG_PROC_FS
1377 proc_cache_fail:
1378 remove_proc_entry("ip6_mr_vif", net->proc_net);
1379 proc_vif_fail:
1380 ip6mr_rules_exit(net);
1381 #endif
1382 fail:
1383 return err;
1384 }
1385
1386 static void __net_exit ip6mr_net_exit(struct net *net)
1387 {
1388 #ifdef CONFIG_PROC_FS
1389 remove_proc_entry("ip6_mr_cache", net->proc_net);
1390 remove_proc_entry("ip6_mr_vif", net->proc_net);
1391 #endif
1392 ip6mr_rules_exit(net);
1393 }
1394
1395 static struct pernet_operations ip6mr_net_ops = {
1396 .init = ip6mr_net_init,
1397 .exit = ip6mr_net_exit,
1398 };
1399
1400 int __init ip6_mr_init(void)
1401 {
1402 int err;
1403
1404 mrt_cachep = kmem_cache_create("ip6_mrt_cache",
1405 sizeof(struct mfc6_cache),
1406 0, SLAB_HWCACHE_ALIGN,
1407 NULL);
1408 if (!mrt_cachep)
1409 return -ENOMEM;
1410
1411 err = register_pernet_subsys(&ip6mr_net_ops);
1412 if (err)
1413 goto reg_pernet_fail;
1414
1415 err = register_netdevice_notifier(&ip6_mr_notifier);
1416 if (err)
1417 goto reg_notif_fail;
1418 #ifdef CONFIG_IPV6_PIMSM_V2
1419 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1420 pr_err("%s: can't add PIM protocol\n", __func__);
1421 err = -EAGAIN;
1422 goto add_proto_fail;
1423 }
1424 #endif
1425 rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL,
1426 ip6mr_rtm_dumproute, NULL);
1427 return 0;
1428 #ifdef CONFIG_IPV6_PIMSM_V2
1429 add_proto_fail:
1430 unregister_netdevice_notifier(&ip6_mr_notifier);
1431 #endif
1432 reg_notif_fail:
1433 unregister_pernet_subsys(&ip6mr_net_ops);
1434 reg_pernet_fail:
1435 kmem_cache_destroy(mrt_cachep);
1436 return err;
1437 }
1438
1439 void ip6_mr_cleanup(void)
1440 {
1441 rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE);
1442 #ifdef CONFIG_IPV6_PIMSM_V2
1443 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
1444 #endif
1445 unregister_netdevice_notifier(&ip6_mr_notifier);
1446 unregister_pernet_subsys(&ip6mr_net_ops);
1447 kmem_cache_destroy(mrt_cachep);
1448 }
1449
1450 static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt,
1451 struct mf6cctl *mfc, int mrtsock, int parent)
1452 {
1453 bool found = false;
1454 int line;
1455 struct mfc6_cache *uc, *c;
1456 unsigned char ttls[MAXMIFS];
1457 int i;
1458
1459 if (mfc->mf6cc_parent >= MAXMIFS)
1460 return -ENFILE;
1461
1462 memset(ttls, 255, MAXMIFS);
1463 for (i = 0; i < MAXMIFS; i++) {
1464 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1465 ttls[i] = 1;
1466
1467 }
1468
1469 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1470
1471 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1472 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1473 ipv6_addr_equal(&c->mf6c_mcastgrp,
1474 &mfc->mf6cc_mcastgrp.sin6_addr) &&
1475 (parent == -1 || parent == mfc->mf6cc_parent)) {
1476 found = true;
1477 break;
1478 }
1479 }
1480
1481 if (found) {
1482 write_lock_bh(&mrt_lock);
1483 c->mf6c_parent = mfc->mf6cc_parent;
1484 ip6mr_update_thresholds(mrt, c, ttls);
1485 if (!mrtsock)
1486 c->mfc_flags |= MFC_STATIC;
1487 write_unlock_bh(&mrt_lock);
1488 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1489 return 0;
1490 }
1491
1492 if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
1493 !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1494 return -EINVAL;
1495
1496 c = ip6mr_cache_alloc();
1497 if (!c)
1498 return -ENOMEM;
1499
1500 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1501 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1502 c->mf6c_parent = mfc->mf6cc_parent;
1503 ip6mr_update_thresholds(mrt, c, ttls);
1504 if (!mrtsock)
1505 c->mfc_flags |= MFC_STATIC;
1506
1507 write_lock_bh(&mrt_lock);
1508 list_add(&c->list, &mrt->mfc6_cache_array[line]);
1509 write_unlock_bh(&mrt_lock);
1510
1511 /*
1512 * Check to see if we resolved a queued list. If so we
1513 * need to send on the frames and tidy up.
1514 */
1515 found = false;
1516 spin_lock_bh(&mfc_unres_lock);
1517 list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) {
1518 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1519 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1520 list_del(&uc->list);
1521 atomic_dec(&mrt->cache_resolve_queue_len);
1522 found = true;
1523 break;
1524 }
1525 }
1526 if (list_empty(&mrt->mfc6_unres_queue))
1527 del_timer(&mrt->ipmr_expire_timer);
1528 spin_unlock_bh(&mfc_unres_lock);
1529
1530 if (found) {
1531 ip6mr_cache_resolve(net, mrt, uc, c);
1532 ip6mr_cache_free(uc);
1533 }
1534 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1535 return 0;
1536 }
1537
1538 /*
1539 * Close the multicast socket, and clear the vif tables etc
1540 */
1541
1542 static void mroute_clean_tables(struct mr6_table *mrt, bool all)
1543 {
1544 int i;
1545 LIST_HEAD(list);
1546 struct mfc6_cache *c, *next;
1547
1548 /*
1549 * Shut down all active vif entries
1550 */
1551 for (i = 0; i < mrt->maxvif; i++) {
1552 if (!all && (mrt->vif6_table[i].flags & VIFF_STATIC))
1553 continue;
1554 mif6_delete(mrt, i, &list);
1555 }
1556 unregister_netdevice_many(&list);
1557
1558 /*
1559 * Wipe the cache
1560 */
1561 for (i = 0; i < MFC6_LINES; i++) {
1562 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) {
1563 if (!all && (c->mfc_flags & MFC_STATIC))
1564 continue;
1565 write_lock_bh(&mrt_lock);
1566 list_del(&c->list);
1567 write_unlock_bh(&mrt_lock);
1568
1569 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1570 ip6mr_cache_free(c);
1571 }
1572 }
1573
1574 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1575 spin_lock_bh(&mfc_unres_lock);
1576 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
1577 list_del(&c->list);
1578 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1579 ip6mr_destroy_unres(mrt, c);
1580 }
1581 spin_unlock_bh(&mfc_unres_lock);
1582 }
1583 }
1584
1585 static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk)
1586 {
1587 int err = 0;
1588 struct net *net = sock_net(sk);
1589
1590 rtnl_lock();
1591 write_lock_bh(&mrt_lock);
1592 if (likely(mrt->mroute6_sk == NULL)) {
1593 mrt->mroute6_sk = sk;
1594 net->ipv6.devconf_all->mc_forwarding++;
1595 inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
1596 NETCONFA_IFINDEX_ALL,
1597 net->ipv6.devconf_all);
1598 }
1599 else
1600 err = -EADDRINUSE;
1601 write_unlock_bh(&mrt_lock);
1602
1603 rtnl_unlock();
1604
1605 return err;
1606 }
1607
1608 int ip6mr_sk_done(struct sock *sk)
1609 {
1610 int err = -EACCES;
1611 struct net *net = sock_net(sk);
1612 struct mr6_table *mrt;
1613
1614 rtnl_lock();
1615 ip6mr_for_each_table(mrt, net) {
1616 if (sk == mrt->mroute6_sk) {
1617 write_lock_bh(&mrt_lock);
1618 mrt->mroute6_sk = NULL;
1619 net->ipv6.devconf_all->mc_forwarding--;
1620 inet6_netconf_notify_devconf(net,
1621 NETCONFA_MC_FORWARDING,
1622 NETCONFA_IFINDEX_ALL,
1623 net->ipv6.devconf_all);
1624 write_unlock_bh(&mrt_lock);
1625
1626 mroute_clean_tables(mrt, false);
1627 err = 0;
1628 break;
1629 }
1630 }
1631 rtnl_unlock();
1632
1633 return err;
1634 }
1635
1636 struct sock *mroute6_socket(struct net *net, struct sk_buff *skb)
1637 {
1638 struct mr6_table *mrt;
1639 struct flowi6 fl6 = {
1640 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
1641 .flowi6_oif = skb->dev->ifindex,
1642 .flowi6_mark = skb->mark,
1643 };
1644
1645 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1646 return NULL;
1647
1648 return mrt->mroute6_sk;
1649 }
1650
1651 /*
1652 * Socket options and virtual interface manipulation. The whole
1653 * virtual interface system is a complete heap, but unfortunately
1654 * that's how BSD mrouted happens to think. Maybe one day with a proper
1655 * MOSPF/PIM router set up we can clean this up.
1656 */
1657
1658 int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1659 {
1660 int ret, parent = 0;
1661 struct mif6ctl vif;
1662 struct mf6cctl mfc;
1663 mifi_t mifi;
1664 struct net *net = sock_net(sk);
1665 struct mr6_table *mrt;
1666
1667 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1668 if (!mrt)
1669 return -ENOENT;
1670
1671 if (optname != MRT6_INIT) {
1672 if (sk != mrt->mroute6_sk && !ns_capable(net->user_ns, CAP_NET_ADMIN))
1673 return -EACCES;
1674 }
1675
1676 switch (optname) {
1677 case MRT6_INIT:
1678 if (sk->sk_type != SOCK_RAW ||
1679 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1680 return -EOPNOTSUPP;
1681 if (optlen < sizeof(int))
1682 return -EINVAL;
1683
1684 return ip6mr_sk_init(mrt, sk);
1685
1686 case MRT6_DONE:
1687 return ip6mr_sk_done(sk);
1688
1689 case MRT6_ADD_MIF:
1690 if (optlen < sizeof(vif))
1691 return -EINVAL;
1692 if (copy_from_user(&vif, optval, sizeof(vif)))
1693 return -EFAULT;
1694 if (vif.mif6c_mifi >= MAXMIFS)
1695 return -ENFILE;
1696 rtnl_lock();
1697 ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk);
1698 rtnl_unlock();
1699 return ret;
1700
1701 case MRT6_DEL_MIF:
1702 if (optlen < sizeof(mifi_t))
1703 return -EINVAL;
1704 if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
1705 return -EFAULT;
1706 rtnl_lock();
1707 ret = mif6_delete(mrt, mifi, NULL);
1708 rtnl_unlock();
1709 return ret;
1710
1711 /*
1712 * Manipulate the forwarding caches. These live
1713 * in a sort of kernel/user symbiosis.
1714 */
1715 case MRT6_ADD_MFC:
1716 case MRT6_DEL_MFC:
1717 parent = -1;
1718 case MRT6_ADD_MFC_PROXY:
1719 case MRT6_DEL_MFC_PROXY:
1720 if (optlen < sizeof(mfc))
1721 return -EINVAL;
1722 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1723 return -EFAULT;
1724 if (parent == 0)
1725 parent = mfc.mf6cc_parent;
1726 rtnl_lock();
1727 if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
1728 ret = ip6mr_mfc_delete(mrt, &mfc, parent);
1729 else
1730 ret = ip6mr_mfc_add(net, mrt, &mfc,
1731 sk == mrt->mroute6_sk, parent);
1732 rtnl_unlock();
1733 return ret;
1734
1735 /*
1736 * Control PIM assert (to activate pim will activate assert)
1737 */
1738 case MRT6_ASSERT:
1739 {
1740 int v;
1741
1742 if (optlen != sizeof(v))
1743 return -EINVAL;
1744 if (get_user(v, (int __user *)optval))
1745 return -EFAULT;
1746 mrt->mroute_do_assert = v;
1747 return 0;
1748 }
1749
1750 #ifdef CONFIG_IPV6_PIMSM_V2
1751 case MRT6_PIM:
1752 {
1753 int v;
1754
1755 if (optlen != sizeof(v))
1756 return -EINVAL;
1757 if (get_user(v, (int __user *)optval))
1758 return -EFAULT;
1759 v = !!v;
1760 rtnl_lock();
1761 ret = 0;
1762 if (v != mrt->mroute_do_pim) {
1763 mrt->mroute_do_pim = v;
1764 mrt->mroute_do_assert = v;
1765 }
1766 rtnl_unlock();
1767 return ret;
1768 }
1769
1770 #endif
1771 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1772 case MRT6_TABLE:
1773 {
1774 u32 v;
1775
1776 if (optlen != sizeof(u32))
1777 return -EINVAL;
1778 if (get_user(v, (u32 __user *)optval))
1779 return -EFAULT;
1780 /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
1781 if (v != RT_TABLE_DEFAULT && v >= 100000000)
1782 return -EINVAL;
1783 if (sk == mrt->mroute6_sk)
1784 return -EBUSY;
1785
1786 rtnl_lock();
1787 ret = 0;
1788 if (!ip6mr_new_table(net, v))
1789 ret = -ENOMEM;
1790 raw6_sk(sk)->ip6mr_table = v;
1791 rtnl_unlock();
1792 return ret;
1793 }
1794 #endif
1795 /*
1796 * Spurious command, or MRT6_VERSION which you cannot
1797 * set.
1798 */
1799 default:
1800 return -ENOPROTOOPT;
1801 }
1802 }
1803
1804 /*
1805 * Getsock opt support for the multicast routing system.
1806 */
1807
1808 int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1809 int __user *optlen)
1810 {
1811 int olr;
1812 int val;
1813 struct net *net = sock_net(sk);
1814 struct mr6_table *mrt;
1815
1816 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1817 if (!mrt)
1818 return -ENOENT;
1819
1820 switch (optname) {
1821 case MRT6_VERSION:
1822 val = 0x0305;
1823 break;
1824 #ifdef CONFIG_IPV6_PIMSM_V2
1825 case MRT6_PIM:
1826 val = mrt->mroute_do_pim;
1827 break;
1828 #endif
1829 case MRT6_ASSERT:
1830 val = mrt->mroute_do_assert;
1831 break;
1832 default:
1833 return -ENOPROTOOPT;
1834 }
1835
1836 if (get_user(olr, optlen))
1837 return -EFAULT;
1838
1839 olr = min_t(int, olr, sizeof(int));
1840 if (olr < 0)
1841 return -EINVAL;
1842
1843 if (put_user(olr, optlen))
1844 return -EFAULT;
1845 if (copy_to_user(optval, &val, olr))
1846 return -EFAULT;
1847 return 0;
1848 }
1849
1850 /*
1851 * The IP multicast ioctl support routines.
1852 */
1853
1854 int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1855 {
1856 struct sioc_sg_req6 sr;
1857 struct sioc_mif_req6 vr;
1858 struct mif_device *vif;
1859 struct mfc6_cache *c;
1860 struct net *net = sock_net(sk);
1861 struct mr6_table *mrt;
1862
1863 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1864 if (!mrt)
1865 return -ENOENT;
1866
1867 switch (cmd) {
1868 case SIOCGETMIFCNT_IN6:
1869 if (copy_from_user(&vr, arg, sizeof(vr)))
1870 return -EFAULT;
1871 if (vr.mifi >= mrt->maxvif)
1872 return -EINVAL;
1873 read_lock(&mrt_lock);
1874 vif = &mrt->vif6_table[vr.mifi];
1875 if (MIF_EXISTS(mrt, vr.mifi)) {
1876 vr.icount = vif->pkt_in;
1877 vr.ocount = vif->pkt_out;
1878 vr.ibytes = vif->bytes_in;
1879 vr.obytes = vif->bytes_out;
1880 read_unlock(&mrt_lock);
1881
1882 if (copy_to_user(arg, &vr, sizeof(vr)))
1883 return -EFAULT;
1884 return 0;
1885 }
1886 read_unlock(&mrt_lock);
1887 return -EADDRNOTAVAIL;
1888 case SIOCGETSGCNT_IN6:
1889 if (copy_from_user(&sr, arg, sizeof(sr)))
1890 return -EFAULT;
1891
1892 read_lock(&mrt_lock);
1893 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1894 if (c) {
1895 sr.pktcnt = c->mfc_un.res.pkt;
1896 sr.bytecnt = c->mfc_un.res.bytes;
1897 sr.wrong_if = c->mfc_un.res.wrong_if;
1898 read_unlock(&mrt_lock);
1899
1900 if (copy_to_user(arg, &sr, sizeof(sr)))
1901 return -EFAULT;
1902 return 0;
1903 }
1904 read_unlock(&mrt_lock);
1905 return -EADDRNOTAVAIL;
1906 default:
1907 return -ENOIOCTLCMD;
1908 }
1909 }
1910
1911 #ifdef CONFIG_COMPAT
1912 struct compat_sioc_sg_req6 {
1913 struct sockaddr_in6 src;
1914 struct sockaddr_in6 grp;
1915 compat_ulong_t pktcnt;
1916 compat_ulong_t bytecnt;
1917 compat_ulong_t wrong_if;
1918 };
1919
1920 struct compat_sioc_mif_req6 {
1921 mifi_t mifi;
1922 compat_ulong_t icount;
1923 compat_ulong_t ocount;
1924 compat_ulong_t ibytes;
1925 compat_ulong_t obytes;
1926 };
1927
1928 int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1929 {
1930 struct compat_sioc_sg_req6 sr;
1931 struct compat_sioc_mif_req6 vr;
1932 struct mif_device *vif;
1933 struct mfc6_cache *c;
1934 struct net *net = sock_net(sk);
1935 struct mr6_table *mrt;
1936
1937 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1938 if (!mrt)
1939 return -ENOENT;
1940
1941 switch (cmd) {
1942 case SIOCGETMIFCNT_IN6:
1943 if (copy_from_user(&vr, arg, sizeof(vr)))
1944 return -EFAULT;
1945 if (vr.mifi >= mrt->maxvif)
1946 return -EINVAL;
1947 read_lock(&mrt_lock);
1948 vif = &mrt->vif6_table[vr.mifi];
1949 if (MIF_EXISTS(mrt, vr.mifi)) {
1950 vr.icount = vif->pkt_in;
1951 vr.ocount = vif->pkt_out;
1952 vr.ibytes = vif->bytes_in;
1953 vr.obytes = vif->bytes_out;
1954 read_unlock(&mrt_lock);
1955
1956 if (copy_to_user(arg, &vr, sizeof(vr)))
1957 return -EFAULT;
1958 return 0;
1959 }
1960 read_unlock(&mrt_lock);
1961 return -EADDRNOTAVAIL;
1962 case SIOCGETSGCNT_IN6:
1963 if (copy_from_user(&sr, arg, sizeof(sr)))
1964 return -EFAULT;
1965
1966 read_lock(&mrt_lock);
1967 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1968 if (c) {
1969 sr.pktcnt = c->mfc_un.res.pkt;
1970 sr.bytecnt = c->mfc_un.res.bytes;
1971 sr.wrong_if = c->mfc_un.res.wrong_if;
1972 read_unlock(&mrt_lock);
1973
1974 if (copy_to_user(arg, &sr, sizeof(sr)))
1975 return -EFAULT;
1976 return 0;
1977 }
1978 read_unlock(&mrt_lock);
1979 return -EADDRNOTAVAIL;
1980 default:
1981 return -ENOIOCTLCMD;
1982 }
1983 }
1984 #endif
1985
1986 static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
1987 {
1988 __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
1989 IPSTATS_MIB_OUTFORWDATAGRAMS);
1990 __IP6_ADD_STATS(net, ip6_dst_idev(skb_dst(skb)),
1991 IPSTATS_MIB_OUTOCTETS, skb->len);
1992 return dst_output(net, sk, skb);
1993 }
1994
1995 /*
1996 * Processing handlers for ip6mr_forward
1997 */
1998
1999 static int ip6mr_forward2(struct net *net, struct mr6_table *mrt,
2000 struct sk_buff *skb, struct mfc6_cache *c, int vifi)
2001 {
2002 struct ipv6hdr *ipv6h;
2003 struct mif_device *vif = &mrt->vif6_table[vifi];
2004 struct net_device *dev;
2005 struct dst_entry *dst;
2006 struct flowi6 fl6;
2007
2008 if (!vif->dev)
2009 goto out_free;
2010
2011 #ifdef CONFIG_IPV6_PIMSM_V2
2012 if (vif->flags & MIFF_REGISTER) {
2013 vif->pkt_out++;
2014 vif->bytes_out += skb->len;
2015 vif->dev->stats.tx_bytes += skb->len;
2016 vif->dev->stats.tx_packets++;
2017 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
2018 goto out_free;
2019 }
2020 #endif
2021
2022 ipv6h = ipv6_hdr(skb);
2023
2024 fl6 = (struct flowi6) {
2025 .flowi6_oif = vif->link,
2026 .daddr = ipv6h->daddr,
2027 };
2028
2029 dst = ip6_route_output(net, NULL, &fl6);
2030 if (dst->error) {
2031 dst_release(dst);
2032 goto out_free;
2033 }
2034
2035 skb_dst_drop(skb);
2036 skb_dst_set(skb, dst);
2037
2038 /*
2039 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
2040 * not only before forwarding, but after forwarding on all output
2041 * interfaces. It is clear, if mrouter runs a multicasting
2042 * program, it should receive packets not depending to what interface
2043 * program is joined.
2044 * If we will not make it, the program will have to join on all
2045 * interfaces. On the other hand, multihoming host (or router, but
2046 * not mrouter) cannot join to more than one interface - it will
2047 * result in receiving multiple packets.
2048 */
2049 dev = vif->dev;
2050 skb->dev = dev;
2051 vif->pkt_out++;
2052 vif->bytes_out += skb->len;
2053
2054 /* We are about to write */
2055 /* XXX: extension headers? */
2056 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
2057 goto out_free;
2058
2059 ipv6h = ipv6_hdr(skb);
2060 ipv6h->hop_limit--;
2061
2062 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
2063
2064 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
2065 net, NULL, skb, skb->dev, dev,
2066 ip6mr_forward2_finish);
2067
2068 out_free:
2069 kfree_skb(skb);
2070 return 0;
2071 }
2072
2073 static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev)
2074 {
2075 int ct;
2076
2077 for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
2078 if (mrt->vif6_table[ct].dev == dev)
2079 break;
2080 }
2081 return ct;
2082 }
2083
2084 static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
2085 struct sk_buff *skb, struct mfc6_cache *cache)
2086 {
2087 int psend = -1;
2088 int vif, ct;
2089 int true_vifi = ip6mr_find_vif(mrt, skb->dev);
2090
2091 vif = cache->mf6c_parent;
2092 cache->mfc_un.res.pkt++;
2093 cache->mfc_un.res.bytes += skb->len;
2094
2095 if (ipv6_addr_any(&cache->mf6c_origin) && true_vifi >= 0) {
2096 struct mfc6_cache *cache_proxy;
2097
2098 /* For an (*,G) entry, we only check that the incoming
2099 * interface is part of the static tree.
2100 */
2101 cache_proxy = ip6mr_cache_find_any_parent(mrt, vif);
2102 if (cache_proxy &&
2103 cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
2104 goto forward;
2105 }
2106
2107 /*
2108 * Wrong interface: drop packet and (maybe) send PIM assert.
2109 */
2110 if (mrt->vif6_table[vif].dev != skb->dev) {
2111 cache->mfc_un.res.wrong_if++;
2112
2113 if (true_vifi >= 0 && mrt->mroute_do_assert &&
2114 /* pimsm uses asserts, when switching from RPT to SPT,
2115 so that we cannot check that packet arrived on an oif.
2116 It is bad, but otherwise we would need to move pretty
2117 large chunk of pimd to kernel. Ough... --ANK
2118 */
2119 (mrt->mroute_do_pim ||
2120 cache->mfc_un.res.ttls[true_vifi] < 255) &&
2121 time_after(jiffies,
2122 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
2123 cache->mfc_un.res.last_assert = jiffies;
2124 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2125 }
2126 goto dont_forward;
2127 }
2128
2129 forward:
2130 mrt->vif6_table[vif].pkt_in++;
2131 mrt->vif6_table[vif].bytes_in += skb->len;
2132
2133 /*
2134 * Forward the frame
2135 */
2136 if (ipv6_addr_any(&cache->mf6c_origin) &&
2137 ipv6_addr_any(&cache->mf6c_mcastgrp)) {
2138 if (true_vifi >= 0 &&
2139 true_vifi != cache->mf6c_parent &&
2140 ipv6_hdr(skb)->hop_limit >
2141 cache->mfc_un.res.ttls[cache->mf6c_parent]) {
2142 /* It's an (*,*) entry and the packet is not coming from
2143 * the upstream: forward the packet to the upstream
2144 * only.
2145 */
2146 psend = cache->mf6c_parent;
2147 goto last_forward;
2148 }
2149 goto dont_forward;
2150 }
2151 for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
2152 /* For (*,G) entry, don't forward to the incoming interface */
2153 if ((!ipv6_addr_any(&cache->mf6c_origin) || ct != true_vifi) &&
2154 ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
2155 if (psend != -1) {
2156 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2157 if (skb2)
2158 ip6mr_forward2(net, mrt, skb2, cache, psend);
2159 }
2160 psend = ct;
2161 }
2162 }
2163 last_forward:
2164 if (psend != -1) {
2165 ip6mr_forward2(net, mrt, skb, cache, psend);
2166 return;
2167 }
2168
2169 dont_forward:
2170 kfree_skb(skb);
2171 }
2172
2173
2174 /*
2175 * Multicast packets for forwarding arrive here
2176 */
2177
2178 int ip6_mr_input(struct sk_buff *skb)
2179 {
2180 struct mfc6_cache *cache;
2181 struct net *net = dev_net(skb->dev);
2182 struct mr6_table *mrt;
2183 struct flowi6 fl6 = {
2184 .flowi6_iif = skb->dev->ifindex,
2185 .flowi6_mark = skb->mark,
2186 };
2187 int err;
2188
2189 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2190 if (err < 0) {
2191 kfree_skb(skb);
2192 return err;
2193 }
2194
2195 read_lock(&mrt_lock);
2196 cache = ip6mr_cache_find(mrt,
2197 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2198 if (!cache) {
2199 int vif = ip6mr_find_vif(mrt, skb->dev);
2200
2201 if (vif >= 0)
2202 cache = ip6mr_cache_find_any(mrt,
2203 &ipv6_hdr(skb)->daddr,
2204 vif);
2205 }
2206
2207 /*
2208 * No usable cache entry
2209 */
2210 if (!cache) {
2211 int vif;
2212
2213 vif = ip6mr_find_vif(mrt, skb->dev);
2214 if (vif >= 0) {
2215 int err = ip6mr_cache_unresolved(mrt, vif, skb);
2216 read_unlock(&mrt_lock);
2217
2218 return err;
2219 }
2220 read_unlock(&mrt_lock);
2221 kfree_skb(skb);
2222 return -ENODEV;
2223 }
2224
2225 ip6_mr_forward(net, mrt, skb, cache);
2226
2227 read_unlock(&mrt_lock);
2228
2229 return 0;
2230 }
2231
2232
2233 static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2234 struct mfc6_cache *c, struct rtmsg *rtm)
2235 {
2236 int ct;
2237 struct rtnexthop *nhp;
2238 struct nlattr *mp_attr;
2239 struct rta_mfc_stats mfcs;
2240
2241 /* If cache is unresolved, don't try to parse IIF and OIF */
2242 if (c->mf6c_parent >= MAXMIFS)
2243 return -ENOENT;
2244
2245 if (MIF_EXISTS(mrt, c->mf6c_parent) &&
2246 nla_put_u32(skb, RTA_IIF, mrt->vif6_table[c->mf6c_parent].dev->ifindex) < 0)
2247 return -EMSGSIZE;
2248 mp_attr = nla_nest_start(skb, RTA_MULTIPATH);
2249 if (!mp_attr)
2250 return -EMSGSIZE;
2251
2252 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2253 if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2254 nhp = nla_reserve_nohdr(skb, sizeof(*nhp));
2255 if (!nhp) {
2256 nla_nest_cancel(skb, mp_attr);
2257 return -EMSGSIZE;
2258 }
2259
2260 nhp->rtnh_flags = 0;
2261 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2262 nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex;
2263 nhp->rtnh_len = sizeof(*nhp);
2264 }
2265 }
2266
2267 nla_nest_end(skb, mp_attr);
2268
2269 mfcs.mfcs_packets = c->mfc_un.res.pkt;
2270 mfcs.mfcs_bytes = c->mfc_un.res.bytes;
2271 mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
2272 if (nla_put_64bit(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs, RTA_PAD) < 0)
2273 return -EMSGSIZE;
2274
2275 rtm->rtm_type = RTN_MULTICAST;
2276 return 1;
2277 }
2278
2279 int ip6mr_get_route(struct net *net,
2280 struct sk_buff *skb, struct rtmsg *rtm, int nowait)
2281 {
2282 int err;
2283 struct mr6_table *mrt;
2284 struct mfc6_cache *cache;
2285 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
2286
2287 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2288 if (!mrt)
2289 return -ENOENT;
2290
2291 read_lock(&mrt_lock);
2292 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2293 if (!cache && skb->dev) {
2294 int vif = ip6mr_find_vif(mrt, skb->dev);
2295
2296 if (vif >= 0)
2297 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
2298 vif);
2299 }
2300
2301 if (!cache) {
2302 struct sk_buff *skb2;
2303 struct ipv6hdr *iph;
2304 struct net_device *dev;
2305 int vif;
2306
2307 if (nowait) {
2308 read_unlock(&mrt_lock);
2309 return -EAGAIN;
2310 }
2311
2312 dev = skb->dev;
2313 if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2314 read_unlock(&mrt_lock);
2315 return -ENODEV;
2316 }
2317
2318 /* really correct? */
2319 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2320 if (!skb2) {
2321 read_unlock(&mrt_lock);
2322 return -ENOMEM;
2323 }
2324
2325 skb_reset_transport_header(skb2);
2326
2327 skb_put(skb2, sizeof(struct ipv6hdr));
2328 skb_reset_network_header(skb2);
2329
2330 iph = ipv6_hdr(skb2);
2331 iph->version = 0;
2332 iph->priority = 0;
2333 iph->flow_lbl[0] = 0;
2334 iph->flow_lbl[1] = 0;
2335 iph->flow_lbl[2] = 0;
2336 iph->payload_len = 0;
2337 iph->nexthdr = IPPROTO_NONE;
2338 iph->hop_limit = 0;
2339 iph->saddr = rt->rt6i_src.addr;
2340 iph->daddr = rt->rt6i_dst.addr;
2341
2342 err = ip6mr_cache_unresolved(mrt, vif, skb2);
2343 read_unlock(&mrt_lock);
2344
2345 return err;
2346 }
2347
2348 if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
2349 cache->mfc_flags |= MFC_NOTIFY;
2350
2351 err = __ip6mr_fill_mroute(mrt, skb, cache, rtm);
2352 read_unlock(&mrt_lock);
2353 return err;
2354 }
2355
2356 static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2357 u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
2358 int flags)
2359 {
2360 struct nlmsghdr *nlh;
2361 struct rtmsg *rtm;
2362 int err;
2363
2364 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2365 if (!nlh)
2366 return -EMSGSIZE;
2367
2368 rtm = nlmsg_data(nlh);
2369 rtm->rtm_family = RTNL_FAMILY_IP6MR;
2370 rtm->rtm_dst_len = 128;
2371 rtm->rtm_src_len = 128;
2372 rtm->rtm_tos = 0;
2373 rtm->rtm_table = mrt->id;
2374 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2375 goto nla_put_failure;
2376 rtm->rtm_type = RTN_MULTICAST;
2377 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2378 if (c->mfc_flags & MFC_STATIC)
2379 rtm->rtm_protocol = RTPROT_STATIC;
2380 else
2381 rtm->rtm_protocol = RTPROT_MROUTED;
2382 rtm->rtm_flags = 0;
2383
2384 if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) ||
2385 nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp))
2386 goto nla_put_failure;
2387 err = __ip6mr_fill_mroute(mrt, skb, c, rtm);
2388 /* do not break the dump if cache is unresolved */
2389 if (err < 0 && err != -ENOENT)
2390 goto nla_put_failure;
2391
2392 nlmsg_end(skb, nlh);
2393 return 0;
2394
2395 nla_put_failure:
2396 nlmsg_cancel(skb, nlh);
2397 return -EMSGSIZE;
2398 }
2399
2400 static int mr6_msgsize(bool unresolved, int maxvif)
2401 {
2402 size_t len =
2403 NLMSG_ALIGN(sizeof(struct rtmsg))
2404 + nla_total_size(4) /* RTA_TABLE */
2405 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
2406 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
2407 ;
2408
2409 if (!unresolved)
2410 len = len
2411 + nla_total_size(4) /* RTA_IIF */
2412 + nla_total_size(0) /* RTA_MULTIPATH */
2413 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2414 /* RTA_MFC_STATS */
2415 + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
2416 ;
2417
2418 return len;
2419 }
2420
2421 static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
2422 int cmd)
2423 {
2424 struct net *net = read_pnet(&mrt->net);
2425 struct sk_buff *skb;
2426 int err = -ENOBUFS;
2427
2428 skb = nlmsg_new(mr6_msgsize(mfc->mf6c_parent >= MAXMIFS, mrt->maxvif),
2429 GFP_ATOMIC);
2430 if (!skb)
2431 goto errout;
2432
2433 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2434 if (err < 0)
2435 goto errout;
2436
2437 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
2438 return;
2439
2440 errout:
2441 kfree_skb(skb);
2442 if (err < 0)
2443 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
2444 }
2445
2446 static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2447 {
2448 struct net *net = sock_net(skb->sk);
2449 struct mr6_table *mrt;
2450 struct mfc6_cache *mfc;
2451 unsigned int t = 0, s_t;
2452 unsigned int h = 0, s_h;
2453 unsigned int e = 0, s_e;
2454
2455 s_t = cb->args[0];
2456 s_h = cb->args[1];
2457 s_e = cb->args[2];
2458
2459 read_lock(&mrt_lock);
2460 ip6mr_for_each_table(mrt, net) {
2461 if (t < s_t)
2462 goto next_table;
2463 if (t > s_t)
2464 s_h = 0;
2465 for (h = s_h; h < MFC6_LINES; h++) {
2466 list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) {
2467 if (e < s_e)
2468 goto next_entry;
2469 if (ip6mr_fill_mroute(mrt, skb,
2470 NETLINK_CB(cb->skb).portid,
2471 cb->nlh->nlmsg_seq,
2472 mfc, RTM_NEWROUTE,
2473 NLM_F_MULTI) < 0)
2474 goto done;
2475 next_entry:
2476 e++;
2477 }
2478 e = s_e = 0;
2479 }
2480 spin_lock_bh(&mfc_unres_lock);
2481 list_for_each_entry(mfc, &mrt->mfc6_unres_queue, list) {
2482 if (e < s_e)
2483 goto next_entry2;
2484 if (ip6mr_fill_mroute(mrt, skb,
2485 NETLINK_CB(cb->skb).portid,
2486 cb->nlh->nlmsg_seq,
2487 mfc, RTM_NEWROUTE,
2488 NLM_F_MULTI) < 0) {
2489 spin_unlock_bh(&mfc_unres_lock);
2490 goto done;
2491 }
2492 next_entry2:
2493 e++;
2494 }
2495 spin_unlock_bh(&mfc_unres_lock);
2496 e = s_e = 0;
2497 s_h = 0;
2498 next_table:
2499 t++;
2500 }
2501 done:
2502 read_unlock(&mrt_lock);
2503
2504 cb->args[2] = e;
2505 cb->args[1] = h;
2506 cb->args[0] = t;
2507
2508 return skb->len;
2509 }
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