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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/system.h>
20#include <asm/uaccess.h>
21#include <linux/types.h>
22#include <linux/sched.h>
23#include <linux/errno.h>
24#include <linux/timer.h>
25#include <linux/mm.h>
26#include <linux/kernel.h>
27#include <linux/fcntl.h>
28#include <linux/stat.h>
29#include <linux/socket.h>
30#include <linux/inet.h>
31#include <linux/netdevice.h>
32#include <linux/inetdevice.h>
33#include <linux/proc_fs.h>
34#include <linux/seq_file.h>
35#include <linux/init.h>
36#include <linux/slab.h>
37#include <linux/compat.h>
38#include <net/protocol.h>
39#include <linux/skbuff.h>
40#include <net/sock.h>
41#include <net/raw.h>
42#include <linux/notifier.h>
43#include <linux/if_arp.h>
44#include <net/checksum.h>
45#include <net/netlink.h>
46#include <net/fib_rules.h>
47
48#include <net/ipv6.h>
49#include <net/ip6_route.h>
50#include <linux/mroute6.h>
51#include <linux/pim.h>
52#include <net/addrconf.h>
53#include <linux/netfilter_ipv6.h>
54#include <net/ip6_checksum.h>
55
56struct mr6_table {
57 struct list_head list;
58#ifdef CONFIG_NET_NS
59 struct net *net;
60#endif
61 u32 id;
62 struct sock *mroute6_sk;
63 struct timer_list ipmr_expire_timer;
64 struct list_head mfc6_unres_queue;
65 struct list_head mfc6_cache_array[MFC6_LINES];
66 struct mif_device vif6_table[MAXMIFS];
67 int maxvif;
68 atomic_t cache_resolve_queue_len;
69 int mroute_do_assert;
70 int mroute_do_pim;
71#ifdef CONFIG_IPV6_PIMSM_V2
72 int mroute_reg_vif_num;
73#endif
74};
75
76struct ip6mr_rule {
77 struct fib_rule common;
78};
79
80struct ip6mr_result {
81 struct mr6_table *mrt;
82};
83
84/* Big lock, protecting vif table, mrt cache and mroute socket state.
85 Note that the changes are semaphored via rtnl_lock.
86 */
87
88static DEFINE_RWLOCK(mrt_lock);
89
90/*
91 * Multicast router control variables
92 */
93
94#define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL)
95
96/* Special spinlock for queue of unresolved entries */
97static DEFINE_SPINLOCK(mfc_unres_lock);
98
99/* We return to original Alan's scheme. Hash table of resolved
100 entries is changed only in process context and protected
101 with weak lock mrt_lock. Queue of unresolved entries is protected
102 with strong spinlock mfc_unres_lock.
103
104 In this case data path is free of exclusive locks at all.
105 */
106
107static struct kmem_cache *mrt_cachep __read_mostly;
108
109static struct mr6_table *ip6mr_new_table(struct net *net, u32 id);
110static void ip6mr_free_table(struct mr6_table *mrt);
111
112static int ip6_mr_forward(struct net *net, struct mr6_table *mrt,
113 struct sk_buff *skb, struct mfc6_cache *cache);
114static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
115 mifi_t mifi, int assert);
116static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
117 struct mfc6_cache *c, struct rtmsg *rtm);
118static int ip6mr_rtm_dumproute(struct sk_buff *skb,
119 struct netlink_callback *cb);
120static void mroute_clean_tables(struct mr6_table *mrt);
121static void ipmr_expire_process(unsigned long arg);
122
123#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
124#define ip6mr_for_each_table(mrt, net) \
125 list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list)
126
127static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
128{
129 struct mr6_table *mrt;
130
131 ip6mr_for_each_table(mrt, net) {
132 if (mrt->id == id)
133 return mrt;
134 }
135 return NULL;
136}
137
138static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
139 struct mr6_table **mrt)
140{
141 struct ip6mr_result res;
142 struct fib_lookup_arg arg = { .result = &res, };
143 int err;
144
145 err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
146 flowi6_to_flowi(flp6), 0, &arg);
147 if (err < 0)
148 return err;
149 *mrt = res.mrt;
150 return 0;
151}
152
153static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
154 int flags, struct fib_lookup_arg *arg)
155{
156 struct ip6mr_result *res = arg->result;
157 struct mr6_table *mrt;
158
159 switch (rule->action) {
160 case FR_ACT_TO_TBL:
161 break;
162 case FR_ACT_UNREACHABLE:
163 return -ENETUNREACH;
164 case FR_ACT_PROHIBIT:
165 return -EACCES;
166 case FR_ACT_BLACKHOLE:
167 default:
168 return -EINVAL;
169 }
170
171 mrt = ip6mr_get_table(rule->fr_net, rule->table);
172 if (mrt == NULL)
173 return -EAGAIN;
174 res->mrt = mrt;
175 return 0;
176}
177
178static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
179{
180 return 1;
181}
182
183static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = {
184 FRA_GENERIC_POLICY,
185};
186
187static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
188 struct fib_rule_hdr *frh, struct nlattr **tb)
189{
190 return 0;
191}
192
193static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
194 struct nlattr **tb)
195{
196 return 1;
197}
198
199static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
200 struct fib_rule_hdr *frh)
201{
202 frh->dst_len = 0;
203 frh->src_len = 0;
204 frh->tos = 0;
205 return 0;
206}
207
208static const struct fib_rules_ops __net_initdata ip6mr_rules_ops_template = {
209 .family = RTNL_FAMILY_IP6MR,
210 .rule_size = sizeof(struct ip6mr_rule),
211 .addr_size = sizeof(struct in6_addr),
212 .action = ip6mr_rule_action,
213 .match = ip6mr_rule_match,
214 .configure = ip6mr_rule_configure,
215 .compare = ip6mr_rule_compare,
216 .default_pref = fib_default_rule_pref,
217 .fill = ip6mr_rule_fill,
218 .nlgroup = RTNLGRP_IPV6_RULE,
219 .policy = ip6mr_rule_policy,
220 .owner = THIS_MODULE,
221};
222
223static int __net_init ip6mr_rules_init(struct net *net)
224{
225 struct fib_rules_ops *ops;
226 struct mr6_table *mrt;
227 int err;
228
229 ops = fib_rules_register(&ip6mr_rules_ops_template, net);
230 if (IS_ERR(ops))
231 return PTR_ERR(ops);
232
233 INIT_LIST_HEAD(&net->ipv6.mr6_tables);
234
235 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
236 if (mrt == NULL) {
237 err = -ENOMEM;
238 goto err1;
239 }
240
241 err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
242 if (err < 0)
243 goto err2;
244
245 net->ipv6.mr6_rules_ops = ops;
246 return 0;
247
248err2:
249 kfree(mrt);
250err1:
251 fib_rules_unregister(ops);
252 return err;
253}
254
255static void __net_exit ip6mr_rules_exit(struct net *net)
256{
257 struct mr6_table *mrt, *next;
258
259 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
260 list_del(&mrt->list);
261 ip6mr_free_table(mrt);
262 }
263 fib_rules_unregister(net->ipv6.mr6_rules_ops);
264}
265#else
266#define ip6mr_for_each_table(mrt, net) \
267 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
268
269static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
270{
271 return net->ipv6.mrt6;
272}
273
274static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
275 struct mr6_table **mrt)
276{
277 *mrt = net->ipv6.mrt6;
278 return 0;
279}
280
281static int __net_init ip6mr_rules_init(struct net *net)
282{
283 net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT);
284 return net->ipv6.mrt6 ? 0 : -ENOMEM;
285}
286
287static void __net_exit ip6mr_rules_exit(struct net *net)
288{
289 ip6mr_free_table(net->ipv6.mrt6);
290}
291#endif
292
293static struct mr6_table *ip6mr_new_table(struct net *net, u32 id)
294{
295 struct mr6_table *mrt;
296 unsigned int i;
297
298 mrt = ip6mr_get_table(net, id);
299 if (mrt != NULL)
300 return mrt;
301
302 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
303 if (mrt == NULL)
304 return NULL;
305 mrt->id = id;
306 write_pnet(&mrt->net, net);
307
308 /* Forwarding cache */
309 for (i = 0; i < MFC6_LINES; i++)
310 INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]);
311
312 INIT_LIST_HEAD(&mrt->mfc6_unres_queue);
313
314 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
315 (unsigned long)mrt);
316
317#ifdef CONFIG_IPV6_PIMSM_V2
318 mrt->mroute_reg_vif_num = -1;
319#endif
320#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
321 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
322#endif
323 return mrt;
324}
325
326static void ip6mr_free_table(struct mr6_table *mrt)
327{
328 del_timer(&mrt->ipmr_expire_timer);
329 mroute_clean_tables(mrt);
330 kfree(mrt);
331}
332
333#ifdef CONFIG_PROC_FS
334
335struct ipmr_mfc_iter {
336 struct seq_net_private p;
337 struct mr6_table *mrt;
338 struct list_head *cache;
339 int ct;
340};
341
342
343static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net,
344 struct ipmr_mfc_iter *it, loff_t pos)
345{
346 struct mr6_table *mrt = it->mrt;
347 struct mfc6_cache *mfc;
348
349 read_lock(&mrt_lock);
350 for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) {
351 it->cache = &mrt->mfc6_cache_array[it->ct];
352 list_for_each_entry(mfc, it->cache, list)
353 if (pos-- == 0)
354 return mfc;
355 }
356 read_unlock(&mrt_lock);
357
358 spin_lock_bh(&mfc_unres_lock);
359 it->cache = &mrt->mfc6_unres_queue;
360 list_for_each_entry(mfc, it->cache, list)
361 if (pos-- == 0)
362 return mfc;
363 spin_unlock_bh(&mfc_unres_lock);
364
365 it->cache = NULL;
366 return NULL;
367}
368
369/*
370 * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif
371 */
372
373struct ipmr_vif_iter {
374 struct seq_net_private p;
375 struct mr6_table *mrt;
376 int ct;
377};
378
379static struct mif_device *ip6mr_vif_seq_idx(struct net *net,
380 struct ipmr_vif_iter *iter,
381 loff_t pos)
382{
383 struct mr6_table *mrt = iter->mrt;
384
385 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
386 if (!MIF_EXISTS(mrt, iter->ct))
387 continue;
388 if (pos-- == 0)
389 return &mrt->vif6_table[iter->ct];
390 }
391 return NULL;
392}
393
394static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
395 __acquires(mrt_lock)
396{
397 struct ipmr_vif_iter *iter = seq->private;
398 struct net *net = seq_file_net(seq);
399 struct mr6_table *mrt;
400
401 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
402 if (mrt == NULL)
403 return ERR_PTR(-ENOENT);
404
405 iter->mrt = mrt;
406
407 read_lock(&mrt_lock);
408 return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1)
409 : SEQ_START_TOKEN;
410}
411
412static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
413{
414 struct ipmr_vif_iter *iter = seq->private;
415 struct net *net = seq_file_net(seq);
416 struct mr6_table *mrt = iter->mrt;
417
418 ++*pos;
419 if (v == SEQ_START_TOKEN)
420 return ip6mr_vif_seq_idx(net, iter, 0);
421
422 while (++iter->ct < mrt->maxvif) {
423 if (!MIF_EXISTS(mrt, iter->ct))
424 continue;
425 return &mrt->vif6_table[iter->ct];
426 }
427 return NULL;
428}
429
430static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
431 __releases(mrt_lock)
432{
433 read_unlock(&mrt_lock);
434}
435
436static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
437{
438 struct ipmr_vif_iter *iter = seq->private;
439 struct mr6_table *mrt = iter->mrt;
440
441 if (v == SEQ_START_TOKEN) {
442 seq_puts(seq,
443 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
444 } else {
445 const struct mif_device *vif = v;
446 const char *name = vif->dev ? vif->dev->name : "none";
447
448 seq_printf(seq,
449 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
450 vif - mrt->vif6_table,
451 name, vif->bytes_in, vif->pkt_in,
452 vif->bytes_out, vif->pkt_out,
453 vif->flags);
454 }
455 return 0;
456}
457
458static const struct seq_operations ip6mr_vif_seq_ops = {
459 .start = ip6mr_vif_seq_start,
460 .next = ip6mr_vif_seq_next,
461 .stop = ip6mr_vif_seq_stop,
462 .show = ip6mr_vif_seq_show,
463};
464
465static int ip6mr_vif_open(struct inode *inode, struct file *file)
466{
467 return seq_open_net(inode, file, &ip6mr_vif_seq_ops,
468 sizeof(struct ipmr_vif_iter));
469}
470
471static const struct file_operations ip6mr_vif_fops = {
472 .owner = THIS_MODULE,
473 .open = ip6mr_vif_open,
474 .read = seq_read,
475 .llseek = seq_lseek,
476 .release = seq_release_net,
477};
478
479static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
480{
481 struct ipmr_mfc_iter *it = seq->private;
482 struct net *net = seq_file_net(seq);
483 struct mr6_table *mrt;
484
485 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
486 if (mrt == NULL)
487 return ERR_PTR(-ENOENT);
488
489 it->mrt = mrt;
490 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
491 : SEQ_START_TOKEN;
492}
493
494static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
495{
496 struct mfc6_cache *mfc = v;
497 struct ipmr_mfc_iter *it = seq->private;
498 struct net *net = seq_file_net(seq);
499 struct mr6_table *mrt = it->mrt;
500
501 ++*pos;
502
503 if (v == SEQ_START_TOKEN)
504 return ipmr_mfc_seq_idx(net, seq->private, 0);
505
506 if (mfc->list.next != it->cache)
507 return list_entry(mfc->list.next, struct mfc6_cache, list);
508
509 if (it->cache == &mrt->mfc6_unres_queue)
510 goto end_of_list;
511
512 BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]);
513
514 while (++it->ct < MFC6_LINES) {
515 it->cache = &mrt->mfc6_cache_array[it->ct];
516 if (list_empty(it->cache))
517 continue;
518 return list_first_entry(it->cache, struct mfc6_cache, list);
519 }
520
521 /* exhausted cache_array, show unresolved */
522 read_unlock(&mrt_lock);
523 it->cache = &mrt->mfc6_unres_queue;
524 it->ct = 0;
525
526 spin_lock_bh(&mfc_unres_lock);
527 if (!list_empty(it->cache))
528 return list_first_entry(it->cache, struct mfc6_cache, list);
529
530 end_of_list:
531 spin_unlock_bh(&mfc_unres_lock);
532 it->cache = NULL;
533
534 return NULL;
535}
536
537static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
538{
539 struct ipmr_mfc_iter *it = seq->private;
540 struct mr6_table *mrt = it->mrt;
541
542 if (it->cache == &mrt->mfc6_unres_queue)
543 spin_unlock_bh(&mfc_unres_lock);
544 else if (it->cache == mrt->mfc6_cache_array)
545 read_unlock(&mrt_lock);
546}
547
548static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
549{
550 int n;
551
552 if (v == SEQ_START_TOKEN) {
553 seq_puts(seq,
554 "Group "
555 "Origin "
556 "Iif Pkts Bytes Wrong Oifs\n");
557 } else {
558 const struct mfc6_cache *mfc = v;
559 const struct ipmr_mfc_iter *it = seq->private;
560 struct mr6_table *mrt = it->mrt;
561
562 seq_printf(seq, "%pI6 %pI6 %-3hd",
563 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
564 mfc->mf6c_parent);
565
566 if (it->cache != &mrt->mfc6_unres_queue) {
567 seq_printf(seq, " %8lu %8lu %8lu",
568 mfc->mfc_un.res.pkt,
569 mfc->mfc_un.res.bytes,
570 mfc->mfc_un.res.wrong_if);
571 for (n = mfc->mfc_un.res.minvif;
572 n < mfc->mfc_un.res.maxvif; n++) {
573 if (MIF_EXISTS(mrt, n) &&
574 mfc->mfc_un.res.ttls[n] < 255)
575 seq_printf(seq,
576 " %2d:%-3d",
577 n, mfc->mfc_un.res.ttls[n]);
578 }
579 } else {
580 /* unresolved mfc_caches don't contain
581 * pkt, bytes and wrong_if values
582 */
583 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
584 }
585 seq_putc(seq, '\n');
586 }
587 return 0;
588}
589
590static const struct seq_operations ipmr_mfc_seq_ops = {
591 .start = ipmr_mfc_seq_start,
592 .next = ipmr_mfc_seq_next,
593 .stop = ipmr_mfc_seq_stop,
594 .show = ipmr_mfc_seq_show,
595};
596
597static int ipmr_mfc_open(struct inode *inode, struct file *file)
598{
599 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
600 sizeof(struct ipmr_mfc_iter));
601}
602
603static const struct file_operations ip6mr_mfc_fops = {
604 .owner = THIS_MODULE,
605 .open = ipmr_mfc_open,
606 .read = seq_read,
607 .llseek = seq_lseek,
608 .release = seq_release_net,
609};
610#endif
611
612#ifdef CONFIG_IPV6_PIMSM_V2
613
614static int pim6_rcv(struct sk_buff *skb)
615{
616 struct pimreghdr *pim;
617 struct ipv6hdr *encap;
618 struct net_device *reg_dev = NULL;
619 struct net *net = dev_net(skb->dev);
620 struct mr6_table *mrt;
621 struct flowi6 fl6 = {
622 .flowi6_iif = skb->dev->ifindex,
623 .flowi6_mark = skb->mark,
624 };
625 int reg_vif_num;
626
627 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
628 goto drop;
629
630 pim = (struct pimreghdr *)skb_transport_header(skb);
631 if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
632 (pim->flags & PIM_NULL_REGISTER) ||
633 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
634 sizeof(*pim), IPPROTO_PIM,
635 csum_partial((void *)pim, sizeof(*pim), 0)) &&
636 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
637 goto drop;
638
639 /* check if the inner packet is destined to mcast group */
640 encap = (struct ipv6hdr *)(skb_transport_header(skb) +
641 sizeof(*pim));
642
643 if (!ipv6_addr_is_multicast(&encap->daddr) ||
644 encap->payload_len == 0 ||
645 ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
646 goto drop;
647
648 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
649 goto drop;
650 reg_vif_num = mrt->mroute_reg_vif_num;
651
652 read_lock(&mrt_lock);
653 if (reg_vif_num >= 0)
654 reg_dev = mrt->vif6_table[reg_vif_num].dev;
655 if (reg_dev)
656 dev_hold(reg_dev);
657 read_unlock(&mrt_lock);
658
659 if (reg_dev == NULL)
660 goto drop;
661
662 skb->mac_header = skb->network_header;
663 skb_pull(skb, (u8 *)encap - skb->data);
664 skb_reset_network_header(skb);
665 skb->protocol = htons(ETH_P_IPV6);
666 skb->ip_summed = CHECKSUM_NONE;
667 skb->pkt_type = PACKET_HOST;
668
669 skb_tunnel_rx(skb, reg_dev);
670
671 netif_rx(skb);
672
673 dev_put(reg_dev);
674 return 0;
675 drop:
676 kfree_skb(skb);
677 return 0;
678}
679
680static const struct inet6_protocol pim6_protocol = {
681 .handler = pim6_rcv,
682};
683
684/* Service routines creating virtual interfaces: PIMREG */
685
686static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
687 struct net_device *dev)
688{
689 struct net *net = dev_net(dev);
690 struct mr6_table *mrt;
691 struct flowi6 fl6 = {
692 .flowi6_oif = dev->ifindex,
693 .flowi6_iif = skb->skb_iif,
694 .flowi6_mark = skb->mark,
695 };
696 int err;
697
698 err = ip6mr_fib_lookup(net, &fl6, &mrt);
699 if (err < 0) {
700 kfree_skb(skb);
701 return err;
702 }
703
704 read_lock(&mrt_lock);
705 dev->stats.tx_bytes += skb->len;
706 dev->stats.tx_packets++;
707 ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
708 read_unlock(&mrt_lock);
709 kfree_skb(skb);
710 return NETDEV_TX_OK;
711}
712
713static const struct net_device_ops reg_vif_netdev_ops = {
714 .ndo_start_xmit = reg_vif_xmit,
715};
716
717static void reg_vif_setup(struct net_device *dev)
718{
719 dev->type = ARPHRD_PIMREG;
720 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
721 dev->flags = IFF_NOARP;
722 dev->netdev_ops = ®_vif_netdev_ops;
723 dev->destructor = free_netdev;
724 dev->features |= NETIF_F_NETNS_LOCAL;
725}
726
727static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt)
728{
729 struct net_device *dev;
730 char name[IFNAMSIZ];
731
732 if (mrt->id == RT6_TABLE_DFLT)
733 sprintf(name, "pim6reg");
734 else
735 sprintf(name, "pim6reg%u", mrt->id);
736
737 dev = alloc_netdev(0, name, reg_vif_setup);
738 if (dev == NULL)
739 return NULL;
740
741 dev_net_set(dev, net);
742
743 if (register_netdevice(dev)) {
744 free_netdev(dev);
745 return NULL;
746 }
747 dev->iflink = 0;
748
749 if (dev_open(dev))
750 goto failure;
751
752 dev_hold(dev);
753 return dev;
754
755failure:
756 /* allow the register to be completed before unregistering. */
757 rtnl_unlock();
758 rtnl_lock();
759
760 unregister_netdevice(dev);
761 return NULL;
762}
763#endif
764
765/*
766 * Delete a VIF entry
767 */
768
769static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head)
770{
771 struct mif_device *v;
772 struct net_device *dev;
773 struct inet6_dev *in6_dev;
774
775 if (vifi < 0 || vifi >= mrt->maxvif)
776 return -EADDRNOTAVAIL;
777
778 v = &mrt->vif6_table[vifi];
779
780 write_lock_bh(&mrt_lock);
781 dev = v->dev;
782 v->dev = NULL;
783
784 if (!dev) {
785 write_unlock_bh(&mrt_lock);
786 return -EADDRNOTAVAIL;
787 }
788
789#ifdef CONFIG_IPV6_PIMSM_V2
790 if (vifi == mrt->mroute_reg_vif_num)
791 mrt->mroute_reg_vif_num = -1;
792#endif
793
794 if (vifi + 1 == mrt->maxvif) {
795 int tmp;
796 for (tmp = vifi - 1; tmp >= 0; tmp--) {
797 if (MIF_EXISTS(mrt, tmp))
798 break;
799 }
800 mrt->maxvif = tmp + 1;
801 }
802
803 write_unlock_bh(&mrt_lock);
804
805 dev_set_allmulti(dev, -1);
806
807 in6_dev = __in6_dev_get(dev);
808 if (in6_dev)
809 in6_dev->cnf.mc_forwarding--;
810
811 if (v->flags & MIFF_REGISTER)
812 unregister_netdevice_queue(dev, head);
813
814 dev_put(dev);
815 return 0;
816}
817
818static inline void ip6mr_cache_free(struct mfc6_cache *c)
819{
820 kmem_cache_free(mrt_cachep, c);
821}
822
823/* Destroy an unresolved cache entry, killing queued skbs
824 and reporting error to netlink readers.
825 */
826
827static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c)
828{
829 struct net *net = read_pnet(&mrt->net);
830 struct sk_buff *skb;
831
832 atomic_dec(&mrt->cache_resolve_queue_len);
833
834 while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
835 if (ipv6_hdr(skb)->version == 0) {
836 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
837 nlh->nlmsg_type = NLMSG_ERROR;
838 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
839 skb_trim(skb, nlh->nlmsg_len);
840 ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT;
841 rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
842 } else
843 kfree_skb(skb);
844 }
845
846 ip6mr_cache_free(c);
847}
848
849
850/* Timer process for all the unresolved queue. */
851
852static void ipmr_do_expire_process(struct mr6_table *mrt)
853{
854 unsigned long now = jiffies;
855 unsigned long expires = 10 * HZ;
856 struct mfc6_cache *c, *next;
857
858 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
859 if (time_after(c->mfc_un.unres.expires, now)) {
860 /* not yet... */
861 unsigned long interval = c->mfc_un.unres.expires - now;
862 if (interval < expires)
863 expires = interval;
864 continue;
865 }
866
867 list_del(&c->list);
868 ip6mr_destroy_unres(mrt, c);
869 }
870
871 if (!list_empty(&mrt->mfc6_unres_queue))
872 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
873}
874
875static void ipmr_expire_process(unsigned long arg)
876{
877 struct mr6_table *mrt = (struct mr6_table *)arg;
878
879 if (!spin_trylock(&mfc_unres_lock)) {
880 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
881 return;
882 }
883
884 if (!list_empty(&mrt->mfc6_unres_queue))
885 ipmr_do_expire_process(mrt);
886
887 spin_unlock(&mfc_unres_lock);
888}
889
890/* Fill oifs list. It is called under write locked mrt_lock. */
891
892static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache,
893 unsigned char *ttls)
894{
895 int vifi;
896
897 cache->mfc_un.res.minvif = MAXMIFS;
898 cache->mfc_un.res.maxvif = 0;
899 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
900
901 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
902 if (MIF_EXISTS(mrt, vifi) &&
903 ttls[vifi] && ttls[vifi] < 255) {
904 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
905 if (cache->mfc_un.res.minvif > vifi)
906 cache->mfc_un.res.minvif = vifi;
907 if (cache->mfc_un.res.maxvif <= vifi)
908 cache->mfc_un.res.maxvif = vifi + 1;
909 }
910 }
911}
912
913static int mif6_add(struct net *net, struct mr6_table *mrt,
914 struct mif6ctl *vifc, int mrtsock)
915{
916 int vifi = vifc->mif6c_mifi;
917 struct mif_device *v = &mrt->vif6_table[vifi];
918 struct net_device *dev;
919 struct inet6_dev *in6_dev;
920 int err;
921
922 /* Is vif busy ? */
923 if (MIF_EXISTS(mrt, vifi))
924 return -EADDRINUSE;
925
926 switch (vifc->mif6c_flags) {
927#ifdef CONFIG_IPV6_PIMSM_V2
928 case MIFF_REGISTER:
929 /*
930 * Special Purpose VIF in PIM
931 * All the packets will be sent to the daemon
932 */
933 if (mrt->mroute_reg_vif_num >= 0)
934 return -EADDRINUSE;
935 dev = ip6mr_reg_vif(net, mrt);
936 if (!dev)
937 return -ENOBUFS;
938 err = dev_set_allmulti(dev, 1);
939 if (err) {
940 unregister_netdevice(dev);
941 dev_put(dev);
942 return err;
943 }
944 break;
945#endif
946 case 0:
947 dev = dev_get_by_index(net, vifc->mif6c_pifi);
948 if (!dev)
949 return -EADDRNOTAVAIL;
950 err = dev_set_allmulti(dev, 1);
951 if (err) {
952 dev_put(dev);
953 return err;
954 }
955 break;
956 default:
957 return -EINVAL;
958 }
959
960 in6_dev = __in6_dev_get(dev);
961 if (in6_dev)
962 in6_dev->cnf.mc_forwarding++;
963
964 /*
965 * Fill in the VIF structures
966 */
967 v->rate_limit = vifc->vifc_rate_limit;
968 v->flags = vifc->mif6c_flags;
969 if (!mrtsock)
970 v->flags |= VIFF_STATIC;
971 v->threshold = vifc->vifc_threshold;
972 v->bytes_in = 0;
973 v->bytes_out = 0;
974 v->pkt_in = 0;
975 v->pkt_out = 0;
976 v->link = dev->ifindex;
977 if (v->flags & MIFF_REGISTER)
978 v->link = dev->iflink;
979
980 /* And finish update writing critical data */
981 write_lock_bh(&mrt_lock);
982 v->dev = dev;
983#ifdef CONFIG_IPV6_PIMSM_V2
984 if (v->flags & MIFF_REGISTER)
985 mrt->mroute_reg_vif_num = vifi;
986#endif
987 if (vifi + 1 > mrt->maxvif)
988 mrt->maxvif = vifi + 1;
989 write_unlock_bh(&mrt_lock);
990 return 0;
991}
992
993static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt,
994 const struct in6_addr *origin,
995 const struct in6_addr *mcastgrp)
996{
997 int line = MFC6_HASH(mcastgrp, origin);
998 struct mfc6_cache *c;
999
1000 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1001 if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
1002 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
1003 return c;
1004 }
1005 return NULL;
1006}
1007
1008/*
1009 * Allocate a multicast cache entry
1010 */
1011static struct mfc6_cache *ip6mr_cache_alloc(void)
1012{
1013 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
1014 if (c == NULL)
1015 return NULL;
1016 c->mfc_un.res.minvif = MAXMIFS;
1017 return c;
1018}
1019
1020static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
1021{
1022 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
1023 if (c == NULL)
1024 return NULL;
1025 skb_queue_head_init(&c->mfc_un.unres.unresolved);
1026 c->mfc_un.unres.expires = jiffies + 10 * HZ;
1027 return c;
1028}
1029
1030/*
1031 * A cache entry has gone into a resolved state from queued
1032 */
1033
1034static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt,
1035 struct mfc6_cache *uc, struct mfc6_cache *c)
1036{
1037 struct sk_buff *skb;
1038
1039 /*
1040 * Play the pending entries through our router
1041 */
1042
1043 while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
1044 if (ipv6_hdr(skb)->version == 0) {
1045 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
1046
1047 if (__ip6mr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) {
1048 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1049 } else {
1050 nlh->nlmsg_type = NLMSG_ERROR;
1051 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
1052 skb_trim(skb, nlh->nlmsg_len);
1053 ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE;
1054 }
1055 rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
1056 } else
1057 ip6_mr_forward(net, mrt, skb, c);
1058 }
1059}
1060
1061/*
1062 * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
1063 * expects the following bizarre scheme.
1064 *
1065 * Called under mrt_lock.
1066 */
1067
1068static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
1069 mifi_t mifi, int assert)
1070{
1071 struct sk_buff *skb;
1072 struct mrt6msg *msg;
1073 int ret;
1074
1075#ifdef CONFIG_IPV6_PIMSM_V2
1076 if (assert == MRT6MSG_WHOLEPKT)
1077 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1078 +sizeof(*msg));
1079 else
1080#endif
1081 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1082
1083 if (!skb)
1084 return -ENOBUFS;
1085
1086 /* I suppose that internal messages
1087 * do not require checksums */
1088
1089 skb->ip_summed = CHECKSUM_UNNECESSARY;
1090
1091#ifdef CONFIG_IPV6_PIMSM_V2
1092 if (assert == MRT6MSG_WHOLEPKT) {
1093 /* Ugly, but we have no choice with this interface.
1094 Duplicate old header, fix length etc.
1095 And all this only to mangle msg->im6_msgtype and
1096 to set msg->im6_mbz to "mbz" :-)
1097 */
1098 skb_push(skb, -skb_network_offset(pkt));
1099
1100 skb_push(skb, sizeof(*msg));
1101 skb_reset_transport_header(skb);
1102 msg = (struct mrt6msg *)skb_transport_header(skb);
1103 msg->im6_mbz = 0;
1104 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
1105 msg->im6_mif = mrt->mroute_reg_vif_num;
1106 msg->im6_pad = 0;
1107 ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr);
1108 ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr);
1109
1110 skb->ip_summed = CHECKSUM_UNNECESSARY;
1111 } else
1112#endif
1113 {
1114 /*
1115 * Copy the IP header
1116 */
1117
1118 skb_put(skb, sizeof(struct ipv6hdr));
1119 skb_reset_network_header(skb);
1120 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1121
1122 /*
1123 * Add our header
1124 */
1125 skb_put(skb, sizeof(*msg));
1126 skb_reset_transport_header(skb);
1127 msg = (struct mrt6msg *)skb_transport_header(skb);
1128
1129 msg->im6_mbz = 0;
1130 msg->im6_msgtype = assert;
1131 msg->im6_mif = mifi;
1132 msg->im6_pad = 0;
1133 ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr);
1134 ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr);
1135
1136 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1137 skb->ip_summed = CHECKSUM_UNNECESSARY;
1138 }
1139
1140 if (mrt->mroute6_sk == NULL) {
1141 kfree_skb(skb);
1142 return -EINVAL;
1143 }
1144
1145 /*
1146 * Deliver to user space multicast routing algorithms
1147 */
1148 ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb);
1149 if (ret < 0) {
1150 if (net_ratelimit())
1151 printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n");
1152 kfree_skb(skb);
1153 }
1154
1155 return ret;
1156}
1157
1158/*
1159 * Queue a packet for resolution. It gets locked cache entry!
1160 */
1161
1162static int
1163ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb)
1164{
1165 bool found = false;
1166 int err;
1167 struct mfc6_cache *c;
1168
1169 spin_lock_bh(&mfc_unres_lock);
1170 list_for_each_entry(c, &mrt->mfc6_unres_queue, list) {
1171 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1172 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1173 found = true;
1174 break;
1175 }
1176 }
1177
1178 if (!found) {
1179 /*
1180 * Create a new entry if allowable
1181 */
1182
1183 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1184 (c = ip6mr_cache_alloc_unres()) == NULL) {
1185 spin_unlock_bh(&mfc_unres_lock);
1186
1187 kfree_skb(skb);
1188 return -ENOBUFS;
1189 }
1190
1191 /*
1192 * Fill in the new cache entry
1193 */
1194 c->mf6c_parent = -1;
1195 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1196 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1197
1198 /*
1199 * Reflect first query at pim6sd
1200 */
1201 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1202 if (err < 0) {
1203 /* If the report failed throw the cache entry
1204 out - Brad Parker
1205 */
1206 spin_unlock_bh(&mfc_unres_lock);
1207
1208 ip6mr_cache_free(c);
1209 kfree_skb(skb);
1210 return err;
1211 }
1212
1213 atomic_inc(&mrt->cache_resolve_queue_len);
1214 list_add(&c->list, &mrt->mfc6_unres_queue);
1215
1216 ipmr_do_expire_process(mrt);
1217 }
1218
1219 /*
1220 * See if we can append the packet
1221 */
1222 if (c->mfc_un.unres.unresolved.qlen > 3) {
1223 kfree_skb(skb);
1224 err = -ENOBUFS;
1225 } else {
1226 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1227 err = 0;
1228 }
1229
1230 spin_unlock_bh(&mfc_unres_lock);
1231 return err;
1232}
1233
1234/*
1235 * MFC6 cache manipulation by user space
1236 */
1237
1238static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc)
1239{
1240 int line;
1241 struct mfc6_cache *c, *next;
1242
1243 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1244
1245 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) {
1246 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1247 ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) {
1248 write_lock_bh(&mrt_lock);
1249 list_del(&c->list);
1250 write_unlock_bh(&mrt_lock);
1251
1252 ip6mr_cache_free(c);
1253 return 0;
1254 }
1255 }
1256 return -ENOENT;
1257}
1258
1259static int ip6mr_device_event(struct notifier_block *this,
1260 unsigned long event, void *ptr)
1261{
1262 struct net_device *dev = ptr;
1263 struct net *net = dev_net(dev);
1264 struct mr6_table *mrt;
1265 struct mif_device *v;
1266 int ct;
1267 LIST_HEAD(list);
1268
1269 if (event != NETDEV_UNREGISTER)
1270 return NOTIFY_DONE;
1271
1272 ip6mr_for_each_table(mrt, net) {
1273 v = &mrt->vif6_table[0];
1274 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1275 if (v->dev == dev)
1276 mif6_delete(mrt, ct, &list);
1277 }
1278 }
1279 unregister_netdevice_many(&list);
1280
1281 return NOTIFY_DONE;
1282}
1283
1284static struct notifier_block ip6_mr_notifier = {
1285 .notifier_call = ip6mr_device_event
1286};
1287
1288/*
1289 * Setup for IP multicast routing
1290 */
1291
1292static int __net_init ip6mr_net_init(struct net *net)
1293{
1294 int err;
1295
1296 err = ip6mr_rules_init(net);
1297 if (err < 0)
1298 goto fail;
1299
1300#ifdef CONFIG_PROC_FS
1301 err = -ENOMEM;
1302 if (!proc_net_fops_create(net, "ip6_mr_vif", 0, &ip6mr_vif_fops))
1303 goto proc_vif_fail;
1304 if (!proc_net_fops_create(net, "ip6_mr_cache", 0, &ip6mr_mfc_fops))
1305 goto proc_cache_fail;
1306#endif
1307
1308 return 0;
1309
1310#ifdef CONFIG_PROC_FS
1311proc_cache_fail:
1312 proc_net_remove(net, "ip6_mr_vif");
1313proc_vif_fail:
1314 ip6mr_rules_exit(net);
1315#endif
1316fail:
1317 return err;
1318}
1319
1320static void __net_exit ip6mr_net_exit(struct net *net)
1321{
1322#ifdef CONFIG_PROC_FS
1323 proc_net_remove(net, "ip6_mr_cache");
1324 proc_net_remove(net, "ip6_mr_vif");
1325#endif
1326 ip6mr_rules_exit(net);
1327}
1328
1329static struct pernet_operations ip6mr_net_ops = {
1330 .init = ip6mr_net_init,
1331 .exit = ip6mr_net_exit,
1332};
1333
1334int __init ip6_mr_init(void)
1335{
1336 int err;
1337
1338 mrt_cachep = kmem_cache_create("ip6_mrt_cache",
1339 sizeof(struct mfc6_cache),
1340 0, SLAB_HWCACHE_ALIGN,
1341 NULL);
1342 if (!mrt_cachep)
1343 return -ENOMEM;
1344
1345 err = register_pernet_subsys(&ip6mr_net_ops);
1346 if (err)
1347 goto reg_pernet_fail;
1348
1349 err = register_netdevice_notifier(&ip6_mr_notifier);
1350 if (err)
1351 goto reg_notif_fail;
1352#ifdef CONFIG_IPV6_PIMSM_V2
1353 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1354 printk(KERN_ERR "ip6_mr_init: can't add PIM protocol\n");
1355 err = -EAGAIN;
1356 goto add_proto_fail;
1357 }
1358#endif
1359 rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL,
1360 ip6mr_rtm_dumproute, NULL);
1361 return 0;
1362#ifdef CONFIG_IPV6_PIMSM_V2
1363add_proto_fail:
1364 unregister_netdevice_notifier(&ip6_mr_notifier);
1365#endif
1366reg_notif_fail:
1367 unregister_pernet_subsys(&ip6mr_net_ops);
1368reg_pernet_fail:
1369 kmem_cache_destroy(mrt_cachep);
1370 return err;
1371}
1372
1373void ip6_mr_cleanup(void)
1374{
1375 unregister_netdevice_notifier(&ip6_mr_notifier);
1376 unregister_pernet_subsys(&ip6mr_net_ops);
1377 kmem_cache_destroy(mrt_cachep);
1378}
1379
1380static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt,
1381 struct mf6cctl *mfc, int mrtsock)
1382{
1383 bool found = false;
1384 int line;
1385 struct mfc6_cache *uc, *c;
1386 unsigned char ttls[MAXMIFS];
1387 int i;
1388
1389 if (mfc->mf6cc_parent >= MAXMIFS)
1390 return -ENFILE;
1391
1392 memset(ttls, 255, MAXMIFS);
1393 for (i = 0; i < MAXMIFS; i++) {
1394 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1395 ttls[i] = 1;
1396
1397 }
1398
1399 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1400
1401 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1402 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1403 ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) {
1404 found = true;
1405 break;
1406 }
1407 }
1408
1409 if (found) {
1410 write_lock_bh(&mrt_lock);
1411 c->mf6c_parent = mfc->mf6cc_parent;
1412 ip6mr_update_thresholds(mrt, c, ttls);
1413 if (!mrtsock)
1414 c->mfc_flags |= MFC_STATIC;
1415 write_unlock_bh(&mrt_lock);
1416 return 0;
1417 }
1418
1419 if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1420 return -EINVAL;
1421
1422 c = ip6mr_cache_alloc();
1423 if (c == NULL)
1424 return -ENOMEM;
1425
1426 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1427 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1428 c->mf6c_parent = mfc->mf6cc_parent;
1429 ip6mr_update_thresholds(mrt, c, ttls);
1430 if (!mrtsock)
1431 c->mfc_flags |= MFC_STATIC;
1432
1433 write_lock_bh(&mrt_lock);
1434 list_add(&c->list, &mrt->mfc6_cache_array[line]);
1435 write_unlock_bh(&mrt_lock);
1436
1437 /*
1438 * Check to see if we resolved a queued list. If so we
1439 * need to send on the frames and tidy up.
1440 */
1441 found = false;
1442 spin_lock_bh(&mfc_unres_lock);
1443 list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) {
1444 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1445 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1446 list_del(&uc->list);
1447 atomic_dec(&mrt->cache_resolve_queue_len);
1448 found = true;
1449 break;
1450 }
1451 }
1452 if (list_empty(&mrt->mfc6_unres_queue))
1453 del_timer(&mrt->ipmr_expire_timer);
1454 spin_unlock_bh(&mfc_unres_lock);
1455
1456 if (found) {
1457 ip6mr_cache_resolve(net, mrt, uc, c);
1458 ip6mr_cache_free(uc);
1459 }
1460 return 0;
1461}
1462
1463/*
1464 * Close the multicast socket, and clear the vif tables etc
1465 */
1466
1467static void mroute_clean_tables(struct mr6_table *mrt)
1468{
1469 int i;
1470 LIST_HEAD(list);
1471 struct mfc6_cache *c, *next;
1472
1473 /*
1474 * Shut down all active vif entries
1475 */
1476 for (i = 0; i < mrt->maxvif; i++) {
1477 if (!(mrt->vif6_table[i].flags & VIFF_STATIC))
1478 mif6_delete(mrt, i, &list);
1479 }
1480 unregister_netdevice_many(&list);
1481
1482 /*
1483 * Wipe the cache
1484 */
1485 for (i = 0; i < MFC6_LINES; i++) {
1486 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) {
1487 if (c->mfc_flags & MFC_STATIC)
1488 continue;
1489 write_lock_bh(&mrt_lock);
1490 list_del(&c->list);
1491 write_unlock_bh(&mrt_lock);
1492
1493 ip6mr_cache_free(c);
1494 }
1495 }
1496
1497 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1498 spin_lock_bh(&mfc_unres_lock);
1499 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
1500 list_del(&c->list);
1501 ip6mr_destroy_unres(mrt, c);
1502 }
1503 spin_unlock_bh(&mfc_unres_lock);
1504 }
1505}
1506
1507static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk)
1508{
1509 int err = 0;
1510 struct net *net = sock_net(sk);
1511
1512 rtnl_lock();
1513 write_lock_bh(&mrt_lock);
1514 if (likely(mrt->mroute6_sk == NULL)) {
1515 mrt->mroute6_sk = sk;
1516 net->ipv6.devconf_all->mc_forwarding++;
1517 }
1518 else
1519 err = -EADDRINUSE;
1520 write_unlock_bh(&mrt_lock);
1521
1522 rtnl_unlock();
1523
1524 return err;
1525}
1526
1527int ip6mr_sk_done(struct sock *sk)
1528{
1529 int err = -EACCES;
1530 struct net *net = sock_net(sk);
1531 struct mr6_table *mrt;
1532
1533 rtnl_lock();
1534 ip6mr_for_each_table(mrt, net) {
1535 if (sk == mrt->mroute6_sk) {
1536 write_lock_bh(&mrt_lock);
1537 mrt->mroute6_sk = NULL;
1538 net->ipv6.devconf_all->mc_forwarding--;
1539 write_unlock_bh(&mrt_lock);
1540
1541 mroute_clean_tables(mrt);
1542 err = 0;
1543 break;
1544 }
1545 }
1546 rtnl_unlock();
1547
1548 return err;
1549}
1550
1551struct sock *mroute6_socket(struct net *net, struct sk_buff *skb)
1552{
1553 struct mr6_table *mrt;
1554 struct flowi6 fl6 = {
1555 .flowi6_iif = skb->skb_iif,
1556 .flowi6_oif = skb->dev->ifindex,
1557 .flowi6_mark = skb->mark,
1558 };
1559
1560 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1561 return NULL;
1562
1563 return mrt->mroute6_sk;
1564}
1565
1566/*
1567 * Socket options and virtual interface manipulation. The whole
1568 * virtual interface system is a complete heap, but unfortunately
1569 * that's how BSD mrouted happens to think. Maybe one day with a proper
1570 * MOSPF/PIM router set up we can clean this up.
1571 */
1572
1573int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1574{
1575 int ret;
1576 struct mif6ctl vif;
1577 struct mf6cctl mfc;
1578 mifi_t mifi;
1579 struct net *net = sock_net(sk);
1580 struct mr6_table *mrt;
1581
1582 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1583 if (mrt == NULL)
1584 return -ENOENT;
1585
1586 if (optname != MRT6_INIT) {
1587 if (sk != mrt->mroute6_sk && !capable(CAP_NET_ADMIN))
1588 return -EACCES;
1589 }
1590
1591 switch (optname) {
1592 case MRT6_INIT:
1593 if (sk->sk_type != SOCK_RAW ||
1594 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1595 return -EOPNOTSUPP;
1596 if (optlen < sizeof(int))
1597 return -EINVAL;
1598
1599 return ip6mr_sk_init(mrt, sk);
1600
1601 case MRT6_DONE:
1602 return ip6mr_sk_done(sk);
1603
1604 case MRT6_ADD_MIF:
1605 if (optlen < sizeof(vif))
1606 return -EINVAL;
1607 if (copy_from_user(&vif, optval, sizeof(vif)))
1608 return -EFAULT;
1609 if (vif.mif6c_mifi >= MAXMIFS)
1610 return -ENFILE;
1611 rtnl_lock();
1612 ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk);
1613 rtnl_unlock();
1614 return ret;
1615
1616 case MRT6_DEL_MIF:
1617 if (optlen < sizeof(mifi_t))
1618 return -EINVAL;
1619 if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
1620 return -EFAULT;
1621 rtnl_lock();
1622 ret = mif6_delete(mrt, mifi, NULL);
1623 rtnl_unlock();
1624 return ret;
1625
1626 /*
1627 * Manipulate the forwarding caches. These live
1628 * in a sort of kernel/user symbiosis.
1629 */
1630 case MRT6_ADD_MFC:
1631 case MRT6_DEL_MFC:
1632 if (optlen < sizeof(mfc))
1633 return -EINVAL;
1634 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1635 return -EFAULT;
1636 rtnl_lock();
1637 if (optname == MRT6_DEL_MFC)
1638 ret = ip6mr_mfc_delete(mrt, &mfc);
1639 else
1640 ret = ip6mr_mfc_add(net, mrt, &mfc, sk == mrt->mroute6_sk);
1641 rtnl_unlock();
1642 return ret;
1643
1644 /*
1645 * Control PIM assert (to activate pim will activate assert)
1646 */
1647 case MRT6_ASSERT:
1648 {
1649 int v;
1650 if (get_user(v, (int __user *)optval))
1651 return -EFAULT;
1652 mrt->mroute_do_assert = !!v;
1653 return 0;
1654 }
1655
1656#ifdef CONFIG_IPV6_PIMSM_V2
1657 case MRT6_PIM:
1658 {
1659 int v;
1660 if (get_user(v, (int __user *)optval))
1661 return -EFAULT;
1662 v = !!v;
1663 rtnl_lock();
1664 ret = 0;
1665 if (v != mrt->mroute_do_pim) {
1666 mrt->mroute_do_pim = v;
1667 mrt->mroute_do_assert = v;
1668 }
1669 rtnl_unlock();
1670 return ret;
1671 }
1672
1673#endif
1674#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1675 case MRT6_TABLE:
1676 {
1677 u32 v;
1678
1679 if (optlen != sizeof(u32))
1680 return -EINVAL;
1681 if (get_user(v, (u32 __user *)optval))
1682 return -EFAULT;
1683 if (sk == mrt->mroute6_sk)
1684 return -EBUSY;
1685
1686 rtnl_lock();
1687 ret = 0;
1688 if (!ip6mr_new_table(net, v))
1689 ret = -ENOMEM;
1690 raw6_sk(sk)->ip6mr_table = v;
1691 rtnl_unlock();
1692 return ret;
1693 }
1694#endif
1695 /*
1696 * Spurious command, or MRT6_VERSION which you cannot
1697 * set.
1698 */
1699 default:
1700 return -ENOPROTOOPT;
1701 }
1702}
1703
1704/*
1705 * Getsock opt support for the multicast routing system.
1706 */
1707
1708int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1709 int __user *optlen)
1710{
1711 int olr;
1712 int val;
1713 struct net *net = sock_net(sk);
1714 struct mr6_table *mrt;
1715
1716 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1717 if (mrt == NULL)
1718 return -ENOENT;
1719
1720 switch (optname) {
1721 case MRT6_VERSION:
1722 val = 0x0305;
1723 break;
1724#ifdef CONFIG_IPV6_PIMSM_V2
1725 case MRT6_PIM:
1726 val = mrt->mroute_do_pim;
1727 break;
1728#endif
1729 case MRT6_ASSERT:
1730 val = mrt->mroute_do_assert;
1731 break;
1732 default:
1733 return -ENOPROTOOPT;
1734 }
1735
1736 if (get_user(olr, optlen))
1737 return -EFAULT;
1738
1739 olr = min_t(int, olr, sizeof(int));
1740 if (olr < 0)
1741 return -EINVAL;
1742
1743 if (put_user(olr, optlen))
1744 return -EFAULT;
1745 if (copy_to_user(optval, &val, olr))
1746 return -EFAULT;
1747 return 0;
1748}
1749
1750/*
1751 * The IP multicast ioctl support routines.
1752 */
1753
1754int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1755{
1756 struct sioc_sg_req6 sr;
1757 struct sioc_mif_req6 vr;
1758 struct mif_device *vif;
1759 struct mfc6_cache *c;
1760 struct net *net = sock_net(sk);
1761 struct mr6_table *mrt;
1762
1763 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1764 if (mrt == NULL)
1765 return -ENOENT;
1766
1767 switch (cmd) {
1768 case SIOCGETMIFCNT_IN6:
1769 if (copy_from_user(&vr, arg, sizeof(vr)))
1770 return -EFAULT;
1771 if (vr.mifi >= mrt->maxvif)
1772 return -EINVAL;
1773 read_lock(&mrt_lock);
1774 vif = &mrt->vif6_table[vr.mifi];
1775 if (MIF_EXISTS(mrt, vr.mifi)) {
1776 vr.icount = vif->pkt_in;
1777 vr.ocount = vif->pkt_out;
1778 vr.ibytes = vif->bytes_in;
1779 vr.obytes = vif->bytes_out;
1780 read_unlock(&mrt_lock);
1781
1782 if (copy_to_user(arg, &vr, sizeof(vr)))
1783 return -EFAULT;
1784 return 0;
1785 }
1786 read_unlock(&mrt_lock);
1787 return -EADDRNOTAVAIL;
1788 case SIOCGETSGCNT_IN6:
1789 if (copy_from_user(&sr, arg, sizeof(sr)))
1790 return -EFAULT;
1791
1792 read_lock(&mrt_lock);
1793 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1794 if (c) {
1795 sr.pktcnt = c->mfc_un.res.pkt;
1796 sr.bytecnt = c->mfc_un.res.bytes;
1797 sr.wrong_if = c->mfc_un.res.wrong_if;
1798 read_unlock(&mrt_lock);
1799
1800 if (copy_to_user(arg, &sr, sizeof(sr)))
1801 return -EFAULT;
1802 return 0;
1803 }
1804 read_unlock(&mrt_lock);
1805 return -EADDRNOTAVAIL;
1806 default:
1807 return -ENOIOCTLCMD;
1808 }
1809}
1810
1811#ifdef CONFIG_COMPAT
1812struct compat_sioc_sg_req6 {
1813 struct sockaddr_in6 src;
1814 struct sockaddr_in6 grp;
1815 compat_ulong_t pktcnt;
1816 compat_ulong_t bytecnt;
1817 compat_ulong_t wrong_if;
1818};
1819
1820struct compat_sioc_mif_req6 {
1821 mifi_t mifi;
1822 compat_ulong_t icount;
1823 compat_ulong_t ocount;
1824 compat_ulong_t ibytes;
1825 compat_ulong_t obytes;
1826};
1827
1828int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1829{
1830 struct compat_sioc_sg_req6 sr;
1831 struct compat_sioc_mif_req6 vr;
1832 struct mif_device *vif;
1833 struct mfc6_cache *c;
1834 struct net *net = sock_net(sk);
1835 struct mr6_table *mrt;
1836
1837 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1838 if (mrt == NULL)
1839 return -ENOENT;
1840
1841 switch (cmd) {
1842 case SIOCGETMIFCNT_IN6:
1843 if (copy_from_user(&vr, arg, sizeof(vr)))
1844 return -EFAULT;
1845 if (vr.mifi >= mrt->maxvif)
1846 return -EINVAL;
1847 read_lock(&mrt_lock);
1848 vif = &mrt->vif6_table[vr.mifi];
1849 if (MIF_EXISTS(mrt, vr.mifi)) {
1850 vr.icount = vif->pkt_in;
1851 vr.ocount = vif->pkt_out;
1852 vr.ibytes = vif->bytes_in;
1853 vr.obytes = vif->bytes_out;
1854 read_unlock(&mrt_lock);
1855
1856 if (copy_to_user(arg, &vr, sizeof(vr)))
1857 return -EFAULT;
1858 return 0;
1859 }
1860 read_unlock(&mrt_lock);
1861 return -EADDRNOTAVAIL;
1862 case SIOCGETSGCNT_IN6:
1863 if (copy_from_user(&sr, arg, sizeof(sr)))
1864 return -EFAULT;
1865
1866 read_lock(&mrt_lock);
1867 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1868 if (c) {
1869 sr.pktcnt = c->mfc_un.res.pkt;
1870 sr.bytecnt = c->mfc_un.res.bytes;
1871 sr.wrong_if = c->mfc_un.res.wrong_if;
1872 read_unlock(&mrt_lock);
1873
1874 if (copy_to_user(arg, &sr, sizeof(sr)))
1875 return -EFAULT;
1876 return 0;
1877 }
1878 read_unlock(&mrt_lock);
1879 return -EADDRNOTAVAIL;
1880 default:
1881 return -ENOIOCTLCMD;
1882 }
1883}
1884#endif
1885
1886static inline int ip6mr_forward2_finish(struct sk_buff *skb)
1887{
1888 IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
1889 IPSTATS_MIB_OUTFORWDATAGRAMS);
1890 return dst_output(skb);
1891}
1892
1893/*
1894 * Processing handlers for ip6mr_forward
1895 */
1896
1897static int ip6mr_forward2(struct net *net, struct mr6_table *mrt,
1898 struct sk_buff *skb, struct mfc6_cache *c, int vifi)
1899{
1900 struct ipv6hdr *ipv6h;
1901 struct mif_device *vif = &mrt->vif6_table[vifi];
1902 struct net_device *dev;
1903 struct dst_entry *dst;
1904 struct flowi6 fl6;
1905
1906 if (vif->dev == NULL)
1907 goto out_free;
1908
1909#ifdef CONFIG_IPV6_PIMSM_V2
1910 if (vif->flags & MIFF_REGISTER) {
1911 vif->pkt_out++;
1912 vif->bytes_out += skb->len;
1913 vif->dev->stats.tx_bytes += skb->len;
1914 vif->dev->stats.tx_packets++;
1915 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
1916 goto out_free;
1917 }
1918#endif
1919
1920 ipv6h = ipv6_hdr(skb);
1921
1922 fl6 = (struct flowi6) {
1923 .flowi6_oif = vif->link,
1924 .daddr = ipv6h->daddr,
1925 };
1926
1927 dst = ip6_route_output(net, NULL, &fl6);
1928 if (!dst)
1929 goto out_free;
1930
1931 skb_dst_drop(skb);
1932 skb_dst_set(skb, dst);
1933
1934 /*
1935 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1936 * not only before forwarding, but after forwarding on all output
1937 * interfaces. It is clear, if mrouter runs a multicasting
1938 * program, it should receive packets not depending to what interface
1939 * program is joined.
1940 * If we will not make it, the program will have to join on all
1941 * interfaces. On the other hand, multihoming host (or router, but
1942 * not mrouter) cannot join to more than one interface - it will
1943 * result in receiving multiple packets.
1944 */
1945 dev = vif->dev;
1946 skb->dev = dev;
1947 vif->pkt_out++;
1948 vif->bytes_out += skb->len;
1949
1950 /* We are about to write */
1951 /* XXX: extension headers? */
1952 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
1953 goto out_free;
1954
1955 ipv6h = ipv6_hdr(skb);
1956 ipv6h->hop_limit--;
1957
1958 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
1959
1960 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dev,
1961 ip6mr_forward2_finish);
1962
1963out_free:
1964 kfree_skb(skb);
1965 return 0;
1966}
1967
1968static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev)
1969{
1970 int ct;
1971
1972 for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
1973 if (mrt->vif6_table[ct].dev == dev)
1974 break;
1975 }
1976 return ct;
1977}
1978
1979static int ip6_mr_forward(struct net *net, struct mr6_table *mrt,
1980 struct sk_buff *skb, struct mfc6_cache *cache)
1981{
1982 int psend = -1;
1983 int vif, ct;
1984
1985 vif = cache->mf6c_parent;
1986 cache->mfc_un.res.pkt++;
1987 cache->mfc_un.res.bytes += skb->len;
1988
1989 /*
1990 * Wrong interface: drop packet and (maybe) send PIM assert.
1991 */
1992 if (mrt->vif6_table[vif].dev != skb->dev) {
1993 int true_vifi;
1994
1995 cache->mfc_un.res.wrong_if++;
1996 true_vifi = ip6mr_find_vif(mrt, skb->dev);
1997
1998 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1999 /* pimsm uses asserts, when switching from RPT to SPT,
2000 so that we cannot check that packet arrived on an oif.
2001 It is bad, but otherwise we would need to move pretty
2002 large chunk of pimd to kernel. Ough... --ANK
2003 */
2004 (mrt->mroute_do_pim ||
2005 cache->mfc_un.res.ttls[true_vifi] < 255) &&
2006 time_after(jiffies,
2007 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
2008 cache->mfc_un.res.last_assert = jiffies;
2009 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2010 }
2011 goto dont_forward;
2012 }
2013
2014 mrt->vif6_table[vif].pkt_in++;
2015 mrt->vif6_table[vif].bytes_in += skb->len;
2016
2017 /*
2018 * Forward the frame
2019 */
2020 for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
2021 if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
2022 if (psend != -1) {
2023 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2024 if (skb2)
2025 ip6mr_forward2(net, mrt, skb2, cache, psend);
2026 }
2027 psend = ct;
2028 }
2029 }
2030 if (psend != -1) {
2031 ip6mr_forward2(net, mrt, skb, cache, psend);
2032 return 0;
2033 }
2034
2035dont_forward:
2036 kfree_skb(skb);
2037 return 0;
2038}
2039
2040
2041/*
2042 * Multicast packets for forwarding arrive here
2043 */
2044
2045int ip6_mr_input(struct sk_buff *skb)
2046{
2047 struct mfc6_cache *cache;
2048 struct net *net = dev_net(skb->dev);
2049 struct mr6_table *mrt;
2050 struct flowi6 fl6 = {
2051 .flowi6_iif = skb->dev->ifindex,
2052 .flowi6_mark = skb->mark,
2053 };
2054 int err;
2055
2056 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2057 if (err < 0) {
2058 kfree_skb(skb);
2059 return err;
2060 }
2061
2062 read_lock(&mrt_lock);
2063 cache = ip6mr_cache_find(mrt,
2064 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2065
2066 /*
2067 * No usable cache entry
2068 */
2069 if (cache == NULL) {
2070 int vif;
2071
2072 vif = ip6mr_find_vif(mrt, skb->dev);
2073 if (vif >= 0) {
2074 int err = ip6mr_cache_unresolved(mrt, vif, skb);
2075 read_unlock(&mrt_lock);
2076
2077 return err;
2078 }
2079 read_unlock(&mrt_lock);
2080 kfree_skb(skb);
2081 return -ENODEV;
2082 }
2083
2084 ip6_mr_forward(net, mrt, skb, cache);
2085
2086 read_unlock(&mrt_lock);
2087
2088 return 0;
2089}
2090
2091
2092static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2093 struct mfc6_cache *c, struct rtmsg *rtm)
2094{
2095 int ct;
2096 struct rtnexthop *nhp;
2097 u8 *b = skb_tail_pointer(skb);
2098 struct rtattr *mp_head;
2099
2100 /* If cache is unresolved, don't try to parse IIF and OIF */
2101 if (c->mf6c_parent >= MAXMIFS)
2102 return -ENOENT;
2103
2104 if (MIF_EXISTS(mrt, c->mf6c_parent))
2105 RTA_PUT(skb, RTA_IIF, 4, &mrt->vif6_table[c->mf6c_parent].dev->ifindex);
2106
2107 mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0));
2108
2109 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2110 if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2111 if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
2112 goto rtattr_failure;
2113 nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
2114 nhp->rtnh_flags = 0;
2115 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2116 nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex;
2117 nhp->rtnh_len = sizeof(*nhp);
2118 }
2119 }
2120 mp_head->rta_type = RTA_MULTIPATH;
2121 mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head;
2122 rtm->rtm_type = RTN_MULTICAST;
2123 return 1;
2124
2125rtattr_failure:
2126 nlmsg_trim(skb, b);
2127 return -EMSGSIZE;
2128}
2129
2130int ip6mr_get_route(struct net *net,
2131 struct sk_buff *skb, struct rtmsg *rtm, int nowait)
2132{
2133 int err;
2134 struct mr6_table *mrt;
2135 struct mfc6_cache *cache;
2136 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
2137
2138 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2139 if (mrt == NULL)
2140 return -ENOENT;
2141
2142 read_lock(&mrt_lock);
2143 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2144
2145 if (!cache) {
2146 struct sk_buff *skb2;
2147 struct ipv6hdr *iph;
2148 struct net_device *dev;
2149 int vif;
2150
2151 if (nowait) {
2152 read_unlock(&mrt_lock);
2153 return -EAGAIN;
2154 }
2155
2156 dev = skb->dev;
2157 if (dev == NULL || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2158 read_unlock(&mrt_lock);
2159 return -ENODEV;
2160 }
2161
2162 /* really correct? */
2163 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2164 if (!skb2) {
2165 read_unlock(&mrt_lock);
2166 return -ENOMEM;
2167 }
2168
2169 skb_reset_transport_header(skb2);
2170
2171 skb_put(skb2, sizeof(struct ipv6hdr));
2172 skb_reset_network_header(skb2);
2173
2174 iph = ipv6_hdr(skb2);
2175 iph->version = 0;
2176 iph->priority = 0;
2177 iph->flow_lbl[0] = 0;
2178 iph->flow_lbl[1] = 0;
2179 iph->flow_lbl[2] = 0;
2180 iph->payload_len = 0;
2181 iph->nexthdr = IPPROTO_NONE;
2182 iph->hop_limit = 0;
2183 ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr);
2184 ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr);
2185
2186 err = ip6mr_cache_unresolved(mrt, vif, skb2);
2187 read_unlock(&mrt_lock);
2188
2189 return err;
2190 }
2191
2192 if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
2193 cache->mfc_flags |= MFC_NOTIFY;
2194
2195 err = __ip6mr_fill_mroute(mrt, skb, cache, rtm);
2196 read_unlock(&mrt_lock);
2197 return err;
2198}
2199
2200static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2201 u32 pid, u32 seq, struct mfc6_cache *c)
2202{
2203 struct nlmsghdr *nlh;
2204 struct rtmsg *rtm;
2205
2206 nlh = nlmsg_put(skb, pid, seq, RTM_NEWROUTE, sizeof(*rtm), NLM_F_MULTI);
2207 if (nlh == NULL)
2208 return -EMSGSIZE;
2209
2210 rtm = nlmsg_data(nlh);
2211 rtm->rtm_family = RTNL_FAMILY_IPMR;
2212 rtm->rtm_dst_len = 128;
2213 rtm->rtm_src_len = 128;
2214 rtm->rtm_tos = 0;
2215 rtm->rtm_table = mrt->id;
2216 NLA_PUT_U32(skb, RTA_TABLE, mrt->id);
2217 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2218 rtm->rtm_protocol = RTPROT_UNSPEC;
2219 rtm->rtm_flags = 0;
2220
2221 NLA_PUT(skb, RTA_SRC, 16, &c->mf6c_origin);
2222 NLA_PUT(skb, RTA_DST, 16, &c->mf6c_mcastgrp);
2223
2224 if (__ip6mr_fill_mroute(mrt, skb, c, rtm) < 0)
2225 goto nla_put_failure;
2226
2227 return nlmsg_end(skb, nlh);
2228
2229nla_put_failure:
2230 nlmsg_cancel(skb, nlh);
2231 return -EMSGSIZE;
2232}
2233
2234static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2235{
2236 struct net *net = sock_net(skb->sk);
2237 struct mr6_table *mrt;
2238 struct mfc6_cache *mfc;
2239 unsigned int t = 0, s_t;
2240 unsigned int h = 0, s_h;
2241 unsigned int e = 0, s_e;
2242
2243 s_t = cb->args[0];
2244 s_h = cb->args[1];
2245 s_e = cb->args[2];
2246
2247 read_lock(&mrt_lock);
2248 ip6mr_for_each_table(mrt, net) {
2249 if (t < s_t)
2250 goto next_table;
2251 if (t > s_t)
2252 s_h = 0;
2253 for (h = s_h; h < MFC6_LINES; h++) {
2254 list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) {
2255 if (e < s_e)
2256 goto next_entry;
2257 if (ip6mr_fill_mroute(mrt, skb,
2258 NETLINK_CB(cb->skb).pid,
2259 cb->nlh->nlmsg_seq,
2260 mfc) < 0)
2261 goto done;
2262next_entry:
2263 e++;
2264 }
2265 e = s_e = 0;
2266 }
2267 s_h = 0;
2268next_table:
2269 t++;
2270 }
2271done:
2272 read_unlock(&mrt_lock);
2273
2274 cb->args[2] = e;
2275 cb->args[1] = h;
2276 cb->args[0] = t;
2277
2278 return skb->len;
2279}
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
57struct mr6_table {
58 struct list_head list;
59#ifdef CONFIG_NET_NS
60 struct net *net;
61#endif
62 u32 id;
63 struct sock *mroute6_sk;
64 struct timer_list ipmr_expire_timer;
65 struct list_head mfc6_unres_queue;
66 struct list_head mfc6_cache_array[MFC6_LINES];
67 struct mif_device vif6_table[MAXMIFS];
68 int maxvif;
69 atomic_t cache_resolve_queue_len;
70 bool mroute_do_assert;
71 bool mroute_do_pim;
72#ifdef CONFIG_IPV6_PIMSM_V2
73 int mroute_reg_vif_num;
74#endif
75};
76
77struct ip6mr_rule {
78 struct fib_rule common;
79};
80
81struct ip6mr_result {
82 struct mr6_table *mrt;
83};
84
85/* Big lock, protecting vif table, mrt cache and mroute socket state.
86 Note that the changes are semaphored via rtnl_lock.
87 */
88
89static DEFINE_RWLOCK(mrt_lock);
90
91/*
92 * Multicast router control variables
93 */
94
95#define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL)
96
97/* Special spinlock for queue of unresolved entries */
98static DEFINE_SPINLOCK(mfc_unres_lock);
99
100/* We return to original Alan's scheme. Hash table of resolved
101 entries is changed only in process context and protected
102 with weak lock mrt_lock. Queue of unresolved entries is protected
103 with strong spinlock mfc_unres_lock.
104
105 In this case data path is free of exclusive locks at all.
106 */
107
108static struct kmem_cache *mrt_cachep __read_mostly;
109
110static struct mr6_table *ip6mr_new_table(struct net *net, u32 id);
111static void ip6mr_free_table(struct mr6_table *mrt);
112
113static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
114 struct sk_buff *skb, struct mfc6_cache *cache);
115static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
116 mifi_t mifi, int assert);
117static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
118 struct mfc6_cache *c, struct rtmsg *rtm);
119static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
120 int cmd);
121static int ip6mr_rtm_dumproute(struct sk_buff *skb,
122 struct netlink_callback *cb);
123static void mroute_clean_tables(struct mr6_table *mrt);
124static void ipmr_expire_process(unsigned long arg);
125
126#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
127#define ip6mr_for_each_table(mrt, net) \
128 list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list)
129
130static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
131{
132 struct mr6_table *mrt;
133
134 ip6mr_for_each_table(mrt, net) {
135 if (mrt->id == id)
136 return mrt;
137 }
138 return NULL;
139}
140
141static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
142 struct mr6_table **mrt)
143{
144 int err;
145 struct ip6mr_result res;
146 struct fib_lookup_arg arg = {
147 .result = &res,
148 .flags = FIB_LOOKUP_NOREF,
149 };
150
151 err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
152 flowi6_to_flowi(flp6), 0, &arg);
153 if (err < 0)
154 return err;
155 *mrt = res.mrt;
156 return 0;
157}
158
159static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
160 int flags, struct fib_lookup_arg *arg)
161{
162 struct ip6mr_result *res = arg->result;
163 struct mr6_table *mrt;
164
165 switch (rule->action) {
166 case FR_ACT_TO_TBL:
167 break;
168 case FR_ACT_UNREACHABLE:
169 return -ENETUNREACH;
170 case FR_ACT_PROHIBIT:
171 return -EACCES;
172 case FR_ACT_BLACKHOLE:
173 default:
174 return -EINVAL;
175 }
176
177 mrt = ip6mr_get_table(rule->fr_net, rule->table);
178 if (mrt == NULL)
179 return -EAGAIN;
180 res->mrt = mrt;
181 return 0;
182}
183
184static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
185{
186 return 1;
187}
188
189static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = {
190 FRA_GENERIC_POLICY,
191};
192
193static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
194 struct fib_rule_hdr *frh, struct nlattr **tb)
195{
196 return 0;
197}
198
199static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
200 struct nlattr **tb)
201{
202 return 1;
203}
204
205static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
206 struct fib_rule_hdr *frh)
207{
208 frh->dst_len = 0;
209 frh->src_len = 0;
210 frh->tos = 0;
211 return 0;
212}
213
214static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
215 .family = RTNL_FAMILY_IP6MR,
216 .rule_size = sizeof(struct ip6mr_rule),
217 .addr_size = sizeof(struct in6_addr),
218 .action = ip6mr_rule_action,
219 .match = ip6mr_rule_match,
220 .configure = ip6mr_rule_configure,
221 .compare = ip6mr_rule_compare,
222 .default_pref = fib_default_rule_pref,
223 .fill = ip6mr_rule_fill,
224 .nlgroup = RTNLGRP_IPV6_RULE,
225 .policy = ip6mr_rule_policy,
226 .owner = THIS_MODULE,
227};
228
229static int __net_init ip6mr_rules_init(struct net *net)
230{
231 struct fib_rules_ops *ops;
232 struct mr6_table *mrt;
233 int err;
234
235 ops = fib_rules_register(&ip6mr_rules_ops_template, net);
236 if (IS_ERR(ops))
237 return PTR_ERR(ops);
238
239 INIT_LIST_HEAD(&net->ipv6.mr6_tables);
240
241 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
242 if (mrt == NULL) {
243 err = -ENOMEM;
244 goto err1;
245 }
246
247 err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
248 if (err < 0)
249 goto err2;
250
251 net->ipv6.mr6_rules_ops = ops;
252 return 0;
253
254err2:
255 kfree(mrt);
256err1:
257 fib_rules_unregister(ops);
258 return err;
259}
260
261static void __net_exit ip6mr_rules_exit(struct net *net)
262{
263 struct mr6_table *mrt, *next;
264
265 rtnl_lock();
266 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
267 list_del(&mrt->list);
268 ip6mr_free_table(mrt);
269 }
270 rtnl_unlock();
271 fib_rules_unregister(net->ipv6.mr6_rules_ops);
272}
273#else
274#define ip6mr_for_each_table(mrt, net) \
275 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
276
277static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
278{
279 return net->ipv6.mrt6;
280}
281
282static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
283 struct mr6_table **mrt)
284{
285 *mrt = net->ipv6.mrt6;
286 return 0;
287}
288
289static int __net_init ip6mr_rules_init(struct net *net)
290{
291 net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT);
292 return net->ipv6.mrt6 ? 0 : -ENOMEM;
293}
294
295static void __net_exit ip6mr_rules_exit(struct net *net)
296{
297 rtnl_lock();
298 ip6mr_free_table(net->ipv6.mrt6);
299 net->ipv6.mrt6 = NULL;
300 rtnl_unlock();
301}
302#endif
303
304static struct mr6_table *ip6mr_new_table(struct net *net, u32 id)
305{
306 struct mr6_table *mrt;
307 unsigned int i;
308
309 mrt = ip6mr_get_table(net, id);
310 if (mrt != NULL)
311 return mrt;
312
313 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
314 if (mrt == NULL)
315 return NULL;
316 mrt->id = id;
317 write_pnet(&mrt->net, net);
318
319 /* Forwarding cache */
320 for (i = 0; i < MFC6_LINES; i++)
321 INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]);
322
323 INIT_LIST_HEAD(&mrt->mfc6_unres_queue);
324
325 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
326 (unsigned long)mrt);
327
328#ifdef CONFIG_IPV6_PIMSM_V2
329 mrt->mroute_reg_vif_num = -1;
330#endif
331#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
332 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
333#endif
334 return mrt;
335}
336
337static void ip6mr_free_table(struct mr6_table *mrt)
338{
339 del_timer(&mrt->ipmr_expire_timer);
340 mroute_clean_tables(mrt);
341 kfree(mrt);
342}
343
344#ifdef CONFIG_PROC_FS
345
346struct ipmr_mfc_iter {
347 struct seq_net_private p;
348 struct mr6_table *mrt;
349 struct list_head *cache;
350 int ct;
351};
352
353
354static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net,
355 struct ipmr_mfc_iter *it, loff_t pos)
356{
357 struct mr6_table *mrt = it->mrt;
358 struct mfc6_cache *mfc;
359
360 read_lock(&mrt_lock);
361 for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) {
362 it->cache = &mrt->mfc6_cache_array[it->ct];
363 list_for_each_entry(mfc, it->cache, list)
364 if (pos-- == 0)
365 return mfc;
366 }
367 read_unlock(&mrt_lock);
368
369 spin_lock_bh(&mfc_unres_lock);
370 it->cache = &mrt->mfc6_unres_queue;
371 list_for_each_entry(mfc, it->cache, list)
372 if (pos-- == 0)
373 return mfc;
374 spin_unlock_bh(&mfc_unres_lock);
375
376 it->cache = NULL;
377 return NULL;
378}
379
380/*
381 * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif
382 */
383
384struct ipmr_vif_iter {
385 struct seq_net_private p;
386 struct mr6_table *mrt;
387 int ct;
388};
389
390static struct mif_device *ip6mr_vif_seq_idx(struct net *net,
391 struct ipmr_vif_iter *iter,
392 loff_t pos)
393{
394 struct mr6_table *mrt = iter->mrt;
395
396 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
397 if (!MIF_EXISTS(mrt, iter->ct))
398 continue;
399 if (pos-- == 0)
400 return &mrt->vif6_table[iter->ct];
401 }
402 return NULL;
403}
404
405static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
406 __acquires(mrt_lock)
407{
408 struct ipmr_vif_iter *iter = seq->private;
409 struct net *net = seq_file_net(seq);
410 struct mr6_table *mrt;
411
412 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
413 if (mrt == NULL)
414 return ERR_PTR(-ENOENT);
415
416 iter->mrt = mrt;
417
418 read_lock(&mrt_lock);
419 return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1)
420 : SEQ_START_TOKEN;
421}
422
423static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
424{
425 struct ipmr_vif_iter *iter = seq->private;
426 struct net *net = seq_file_net(seq);
427 struct mr6_table *mrt = iter->mrt;
428
429 ++*pos;
430 if (v == SEQ_START_TOKEN)
431 return ip6mr_vif_seq_idx(net, iter, 0);
432
433 while (++iter->ct < mrt->maxvif) {
434 if (!MIF_EXISTS(mrt, iter->ct))
435 continue;
436 return &mrt->vif6_table[iter->ct];
437 }
438 return NULL;
439}
440
441static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
442 __releases(mrt_lock)
443{
444 read_unlock(&mrt_lock);
445}
446
447static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
448{
449 struct ipmr_vif_iter *iter = seq->private;
450 struct mr6_table *mrt = iter->mrt;
451
452 if (v == SEQ_START_TOKEN) {
453 seq_puts(seq,
454 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
455 } else {
456 const struct mif_device *vif = v;
457 const char *name = vif->dev ? vif->dev->name : "none";
458
459 seq_printf(seq,
460 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
461 vif - mrt->vif6_table,
462 name, vif->bytes_in, vif->pkt_in,
463 vif->bytes_out, vif->pkt_out,
464 vif->flags);
465 }
466 return 0;
467}
468
469static const struct seq_operations ip6mr_vif_seq_ops = {
470 .start = ip6mr_vif_seq_start,
471 .next = ip6mr_vif_seq_next,
472 .stop = ip6mr_vif_seq_stop,
473 .show = ip6mr_vif_seq_show,
474};
475
476static int ip6mr_vif_open(struct inode *inode, struct file *file)
477{
478 return seq_open_net(inode, file, &ip6mr_vif_seq_ops,
479 sizeof(struct ipmr_vif_iter));
480}
481
482static const struct file_operations ip6mr_vif_fops = {
483 .owner = THIS_MODULE,
484 .open = ip6mr_vif_open,
485 .read = seq_read,
486 .llseek = seq_lseek,
487 .release = seq_release_net,
488};
489
490static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
491{
492 struct ipmr_mfc_iter *it = seq->private;
493 struct net *net = seq_file_net(seq);
494 struct mr6_table *mrt;
495
496 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
497 if (mrt == NULL)
498 return ERR_PTR(-ENOENT);
499
500 it->mrt = mrt;
501 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
502 : SEQ_START_TOKEN;
503}
504
505static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
506{
507 struct mfc6_cache *mfc = v;
508 struct ipmr_mfc_iter *it = seq->private;
509 struct net *net = seq_file_net(seq);
510 struct mr6_table *mrt = it->mrt;
511
512 ++*pos;
513
514 if (v == SEQ_START_TOKEN)
515 return ipmr_mfc_seq_idx(net, seq->private, 0);
516
517 if (mfc->list.next != it->cache)
518 return list_entry(mfc->list.next, struct mfc6_cache, list);
519
520 if (it->cache == &mrt->mfc6_unres_queue)
521 goto end_of_list;
522
523 BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]);
524
525 while (++it->ct < MFC6_LINES) {
526 it->cache = &mrt->mfc6_cache_array[it->ct];
527 if (list_empty(it->cache))
528 continue;
529 return list_first_entry(it->cache, struct mfc6_cache, list);
530 }
531
532 /* exhausted cache_array, show unresolved */
533 read_unlock(&mrt_lock);
534 it->cache = &mrt->mfc6_unres_queue;
535 it->ct = 0;
536
537 spin_lock_bh(&mfc_unres_lock);
538 if (!list_empty(it->cache))
539 return list_first_entry(it->cache, struct mfc6_cache, list);
540
541 end_of_list:
542 spin_unlock_bh(&mfc_unres_lock);
543 it->cache = NULL;
544
545 return NULL;
546}
547
548static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
549{
550 struct ipmr_mfc_iter *it = seq->private;
551 struct mr6_table *mrt = it->mrt;
552
553 if (it->cache == &mrt->mfc6_unres_queue)
554 spin_unlock_bh(&mfc_unres_lock);
555 else if (it->cache == mrt->mfc6_cache_array)
556 read_unlock(&mrt_lock);
557}
558
559static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
560{
561 int n;
562
563 if (v == SEQ_START_TOKEN) {
564 seq_puts(seq,
565 "Group "
566 "Origin "
567 "Iif Pkts Bytes Wrong Oifs\n");
568 } else {
569 const struct mfc6_cache *mfc = v;
570 const struct ipmr_mfc_iter *it = seq->private;
571 struct mr6_table *mrt = it->mrt;
572
573 seq_printf(seq, "%pI6 %pI6 %-3hd",
574 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
575 mfc->mf6c_parent);
576
577 if (it->cache != &mrt->mfc6_unres_queue) {
578 seq_printf(seq, " %8lu %8lu %8lu",
579 mfc->mfc_un.res.pkt,
580 mfc->mfc_un.res.bytes,
581 mfc->mfc_un.res.wrong_if);
582 for (n = mfc->mfc_un.res.minvif;
583 n < mfc->mfc_un.res.maxvif; n++) {
584 if (MIF_EXISTS(mrt, n) &&
585 mfc->mfc_un.res.ttls[n] < 255)
586 seq_printf(seq,
587 " %2d:%-3d",
588 n, mfc->mfc_un.res.ttls[n]);
589 }
590 } else {
591 /* unresolved mfc_caches don't contain
592 * pkt, bytes and wrong_if values
593 */
594 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
595 }
596 seq_putc(seq, '\n');
597 }
598 return 0;
599}
600
601static const struct seq_operations ipmr_mfc_seq_ops = {
602 .start = ipmr_mfc_seq_start,
603 .next = ipmr_mfc_seq_next,
604 .stop = ipmr_mfc_seq_stop,
605 .show = ipmr_mfc_seq_show,
606};
607
608static int ipmr_mfc_open(struct inode *inode, struct file *file)
609{
610 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
611 sizeof(struct ipmr_mfc_iter));
612}
613
614static const struct file_operations ip6mr_mfc_fops = {
615 .owner = THIS_MODULE,
616 .open = ipmr_mfc_open,
617 .read = seq_read,
618 .llseek = seq_lseek,
619 .release = seq_release_net,
620};
621#endif
622
623#ifdef CONFIG_IPV6_PIMSM_V2
624
625static int pim6_rcv(struct sk_buff *skb)
626{
627 struct pimreghdr *pim;
628 struct ipv6hdr *encap;
629 struct net_device *reg_dev = NULL;
630 struct net *net = dev_net(skb->dev);
631 struct mr6_table *mrt;
632 struct flowi6 fl6 = {
633 .flowi6_iif = skb->dev->ifindex,
634 .flowi6_mark = skb->mark,
635 };
636 int reg_vif_num;
637
638 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
639 goto drop;
640
641 pim = (struct pimreghdr *)skb_transport_header(skb);
642 if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
643 (pim->flags & PIM_NULL_REGISTER) ||
644 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
645 sizeof(*pim), IPPROTO_PIM,
646 csum_partial((void *)pim, sizeof(*pim), 0)) &&
647 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
648 goto drop;
649
650 /* check if the inner packet is destined to mcast group */
651 encap = (struct ipv6hdr *)(skb_transport_header(skb) +
652 sizeof(*pim));
653
654 if (!ipv6_addr_is_multicast(&encap->daddr) ||
655 encap->payload_len == 0 ||
656 ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
657 goto drop;
658
659 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
660 goto drop;
661 reg_vif_num = mrt->mroute_reg_vif_num;
662
663 read_lock(&mrt_lock);
664 if (reg_vif_num >= 0)
665 reg_dev = mrt->vif6_table[reg_vif_num].dev;
666 if (reg_dev)
667 dev_hold(reg_dev);
668 read_unlock(&mrt_lock);
669
670 if (reg_dev == NULL)
671 goto drop;
672
673 skb->mac_header = skb->network_header;
674 skb_pull(skb, (u8 *)encap - skb->data);
675 skb_reset_network_header(skb);
676 skb->protocol = htons(ETH_P_IPV6);
677 skb->ip_summed = CHECKSUM_NONE;
678
679 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
680
681 netif_rx(skb);
682
683 dev_put(reg_dev);
684 return 0;
685 drop:
686 kfree_skb(skb);
687 return 0;
688}
689
690static const struct inet6_protocol pim6_protocol = {
691 .handler = pim6_rcv,
692};
693
694/* Service routines creating virtual interfaces: PIMREG */
695
696static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
697 struct net_device *dev)
698{
699 struct net *net = dev_net(dev);
700 struct mr6_table *mrt;
701 struct flowi6 fl6 = {
702 .flowi6_oif = dev->ifindex,
703 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
704 .flowi6_mark = skb->mark,
705 };
706 int err;
707
708 err = ip6mr_fib_lookup(net, &fl6, &mrt);
709 if (err < 0) {
710 kfree_skb(skb);
711 return err;
712 }
713
714 read_lock(&mrt_lock);
715 dev->stats.tx_bytes += skb->len;
716 dev->stats.tx_packets++;
717 ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
718 read_unlock(&mrt_lock);
719 kfree_skb(skb);
720 return NETDEV_TX_OK;
721}
722
723static const struct net_device_ops reg_vif_netdev_ops = {
724 .ndo_start_xmit = reg_vif_xmit,
725};
726
727static void reg_vif_setup(struct net_device *dev)
728{
729 dev->type = ARPHRD_PIMREG;
730 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
731 dev->flags = IFF_NOARP;
732 dev->netdev_ops = ®_vif_netdev_ops;
733 dev->destructor = free_netdev;
734 dev->features |= NETIF_F_NETNS_LOCAL;
735}
736
737static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt)
738{
739 struct net_device *dev;
740 char name[IFNAMSIZ];
741
742 if (mrt->id == RT6_TABLE_DFLT)
743 sprintf(name, "pim6reg");
744 else
745 sprintf(name, "pim6reg%u", mrt->id);
746
747 dev = alloc_netdev(0, name, reg_vif_setup);
748 if (dev == NULL)
749 return NULL;
750
751 dev_net_set(dev, net);
752
753 if (register_netdevice(dev)) {
754 free_netdev(dev);
755 return NULL;
756 }
757 dev->iflink = 0;
758
759 if (dev_open(dev))
760 goto failure;
761
762 dev_hold(dev);
763 return dev;
764
765failure:
766 /* allow the register to be completed before unregistering. */
767 rtnl_unlock();
768 rtnl_lock();
769
770 unregister_netdevice(dev);
771 return NULL;
772}
773#endif
774
775/*
776 * Delete a VIF entry
777 */
778
779static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head)
780{
781 struct mif_device *v;
782 struct net_device *dev;
783 struct inet6_dev *in6_dev;
784
785 if (vifi < 0 || vifi >= mrt->maxvif)
786 return -EADDRNOTAVAIL;
787
788 v = &mrt->vif6_table[vifi];
789
790 write_lock_bh(&mrt_lock);
791 dev = v->dev;
792 v->dev = NULL;
793
794 if (!dev) {
795 write_unlock_bh(&mrt_lock);
796 return -EADDRNOTAVAIL;
797 }
798
799#ifdef CONFIG_IPV6_PIMSM_V2
800 if (vifi == mrt->mroute_reg_vif_num)
801 mrt->mroute_reg_vif_num = -1;
802#endif
803
804 if (vifi + 1 == mrt->maxvif) {
805 int tmp;
806 for (tmp = vifi - 1; tmp >= 0; tmp--) {
807 if (MIF_EXISTS(mrt, tmp))
808 break;
809 }
810 mrt->maxvif = tmp + 1;
811 }
812
813 write_unlock_bh(&mrt_lock);
814
815 dev_set_allmulti(dev, -1);
816
817 in6_dev = __in6_dev_get(dev);
818 if (in6_dev) {
819 in6_dev->cnf.mc_forwarding--;
820 inet6_netconf_notify_devconf(dev_net(dev),
821 NETCONFA_MC_FORWARDING,
822 dev->ifindex, &in6_dev->cnf);
823 }
824
825 if (v->flags & MIFF_REGISTER)
826 unregister_netdevice_queue(dev, head);
827
828 dev_put(dev);
829 return 0;
830}
831
832static inline void ip6mr_cache_free(struct mfc6_cache *c)
833{
834 kmem_cache_free(mrt_cachep, c);
835}
836
837/* Destroy an unresolved cache entry, killing queued skbs
838 and reporting error to netlink readers.
839 */
840
841static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c)
842{
843 struct net *net = read_pnet(&mrt->net);
844 struct sk_buff *skb;
845
846 atomic_dec(&mrt->cache_resolve_queue_len);
847
848 while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
849 if (ipv6_hdr(skb)->version == 0) {
850 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
851 nlh->nlmsg_type = NLMSG_ERROR;
852 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
853 skb_trim(skb, nlh->nlmsg_len);
854 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
855 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
856 } else
857 kfree_skb(skb);
858 }
859
860 ip6mr_cache_free(c);
861}
862
863
864/* Timer process for all the unresolved queue. */
865
866static void ipmr_do_expire_process(struct mr6_table *mrt)
867{
868 unsigned long now = jiffies;
869 unsigned long expires = 10 * HZ;
870 struct mfc6_cache *c, *next;
871
872 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
873 if (time_after(c->mfc_un.unres.expires, now)) {
874 /* not yet... */
875 unsigned long interval = c->mfc_un.unres.expires - now;
876 if (interval < expires)
877 expires = interval;
878 continue;
879 }
880
881 list_del(&c->list);
882 mr6_netlink_event(mrt, c, RTM_DELROUTE);
883 ip6mr_destroy_unres(mrt, c);
884 }
885
886 if (!list_empty(&mrt->mfc6_unres_queue))
887 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
888}
889
890static void ipmr_expire_process(unsigned long arg)
891{
892 struct mr6_table *mrt = (struct mr6_table *)arg;
893
894 if (!spin_trylock(&mfc_unres_lock)) {
895 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
896 return;
897 }
898
899 if (!list_empty(&mrt->mfc6_unres_queue))
900 ipmr_do_expire_process(mrt);
901
902 spin_unlock(&mfc_unres_lock);
903}
904
905/* Fill oifs list. It is called under write locked mrt_lock. */
906
907static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache,
908 unsigned char *ttls)
909{
910 int vifi;
911
912 cache->mfc_un.res.minvif = MAXMIFS;
913 cache->mfc_un.res.maxvif = 0;
914 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
915
916 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
917 if (MIF_EXISTS(mrt, vifi) &&
918 ttls[vifi] && ttls[vifi] < 255) {
919 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
920 if (cache->mfc_un.res.minvif > vifi)
921 cache->mfc_un.res.minvif = vifi;
922 if (cache->mfc_un.res.maxvif <= vifi)
923 cache->mfc_un.res.maxvif = vifi + 1;
924 }
925 }
926}
927
928static int mif6_add(struct net *net, struct mr6_table *mrt,
929 struct mif6ctl *vifc, int mrtsock)
930{
931 int vifi = vifc->mif6c_mifi;
932 struct mif_device *v = &mrt->vif6_table[vifi];
933 struct net_device *dev;
934 struct inet6_dev *in6_dev;
935 int err;
936
937 /* Is vif busy ? */
938 if (MIF_EXISTS(mrt, vifi))
939 return -EADDRINUSE;
940
941 switch (vifc->mif6c_flags) {
942#ifdef CONFIG_IPV6_PIMSM_V2
943 case MIFF_REGISTER:
944 /*
945 * Special Purpose VIF in PIM
946 * All the packets will be sent to the daemon
947 */
948 if (mrt->mroute_reg_vif_num >= 0)
949 return -EADDRINUSE;
950 dev = ip6mr_reg_vif(net, mrt);
951 if (!dev)
952 return -ENOBUFS;
953 err = dev_set_allmulti(dev, 1);
954 if (err) {
955 unregister_netdevice(dev);
956 dev_put(dev);
957 return err;
958 }
959 break;
960#endif
961 case 0:
962 dev = dev_get_by_index(net, vifc->mif6c_pifi);
963 if (!dev)
964 return -EADDRNOTAVAIL;
965 err = dev_set_allmulti(dev, 1);
966 if (err) {
967 dev_put(dev);
968 return err;
969 }
970 break;
971 default:
972 return -EINVAL;
973 }
974
975 in6_dev = __in6_dev_get(dev);
976 if (in6_dev) {
977 in6_dev->cnf.mc_forwarding++;
978 inet6_netconf_notify_devconf(dev_net(dev),
979 NETCONFA_MC_FORWARDING,
980 dev->ifindex, &in6_dev->cnf);
981 }
982
983 /*
984 * Fill in the VIF structures
985 */
986 v->rate_limit = vifc->vifc_rate_limit;
987 v->flags = vifc->mif6c_flags;
988 if (!mrtsock)
989 v->flags |= VIFF_STATIC;
990 v->threshold = vifc->vifc_threshold;
991 v->bytes_in = 0;
992 v->bytes_out = 0;
993 v->pkt_in = 0;
994 v->pkt_out = 0;
995 v->link = dev->ifindex;
996 if (v->flags & MIFF_REGISTER)
997 v->link = dev->iflink;
998
999 /* And finish update writing critical data */
1000 write_lock_bh(&mrt_lock);
1001 v->dev = dev;
1002#ifdef CONFIG_IPV6_PIMSM_V2
1003 if (v->flags & MIFF_REGISTER)
1004 mrt->mroute_reg_vif_num = vifi;
1005#endif
1006 if (vifi + 1 > mrt->maxvif)
1007 mrt->maxvif = vifi + 1;
1008 write_unlock_bh(&mrt_lock);
1009 return 0;
1010}
1011
1012static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt,
1013 const struct in6_addr *origin,
1014 const struct in6_addr *mcastgrp)
1015{
1016 int line = MFC6_HASH(mcastgrp, origin);
1017 struct mfc6_cache *c;
1018
1019 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1020 if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
1021 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
1022 return c;
1023 }
1024 return NULL;
1025}
1026
1027/* Look for a (*,*,oif) entry */
1028static struct mfc6_cache *ip6mr_cache_find_any_parent(struct mr6_table *mrt,
1029 mifi_t mifi)
1030{
1031 int line = MFC6_HASH(&in6addr_any, &in6addr_any);
1032 struct mfc6_cache *c;
1033
1034 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
1035 if (ipv6_addr_any(&c->mf6c_origin) &&
1036 ipv6_addr_any(&c->mf6c_mcastgrp) &&
1037 (c->mfc_un.res.ttls[mifi] < 255))
1038 return c;
1039
1040 return NULL;
1041}
1042
1043/* Look for a (*,G) entry */
1044static struct mfc6_cache *ip6mr_cache_find_any(struct mr6_table *mrt,
1045 struct in6_addr *mcastgrp,
1046 mifi_t mifi)
1047{
1048 int line = MFC6_HASH(mcastgrp, &in6addr_any);
1049 struct mfc6_cache *c, *proxy;
1050
1051 if (ipv6_addr_any(mcastgrp))
1052 goto skip;
1053
1054 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
1055 if (ipv6_addr_any(&c->mf6c_origin) &&
1056 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) {
1057 if (c->mfc_un.res.ttls[mifi] < 255)
1058 return c;
1059
1060 /* It's ok if the mifi is part of the static tree */
1061 proxy = ip6mr_cache_find_any_parent(mrt,
1062 c->mf6c_parent);
1063 if (proxy && proxy->mfc_un.res.ttls[mifi] < 255)
1064 return c;
1065 }
1066
1067skip:
1068 return ip6mr_cache_find_any_parent(mrt, mifi);
1069}
1070
1071/*
1072 * Allocate a multicast cache entry
1073 */
1074static struct mfc6_cache *ip6mr_cache_alloc(void)
1075{
1076 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
1077 if (c == NULL)
1078 return NULL;
1079 c->mfc_un.res.minvif = MAXMIFS;
1080 return c;
1081}
1082
1083static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
1084{
1085 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
1086 if (c == NULL)
1087 return NULL;
1088 skb_queue_head_init(&c->mfc_un.unres.unresolved);
1089 c->mfc_un.unres.expires = jiffies + 10 * HZ;
1090 return c;
1091}
1092
1093/*
1094 * A cache entry has gone into a resolved state from queued
1095 */
1096
1097static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt,
1098 struct mfc6_cache *uc, struct mfc6_cache *c)
1099{
1100 struct sk_buff *skb;
1101
1102 /*
1103 * Play the pending entries through our router
1104 */
1105
1106 while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
1107 if (ipv6_hdr(skb)->version == 0) {
1108 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
1109
1110 if (__ip6mr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
1111 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1112 } else {
1113 nlh->nlmsg_type = NLMSG_ERROR;
1114 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1115 skb_trim(skb, nlh->nlmsg_len);
1116 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
1117 }
1118 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1119 } else
1120 ip6_mr_forward(net, mrt, skb, c);
1121 }
1122}
1123
1124/*
1125 * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
1126 * expects the following bizarre scheme.
1127 *
1128 * Called under mrt_lock.
1129 */
1130
1131static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
1132 mifi_t mifi, int assert)
1133{
1134 struct sk_buff *skb;
1135 struct mrt6msg *msg;
1136 int ret;
1137
1138#ifdef CONFIG_IPV6_PIMSM_V2
1139 if (assert == MRT6MSG_WHOLEPKT)
1140 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1141 +sizeof(*msg));
1142 else
1143#endif
1144 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1145
1146 if (!skb)
1147 return -ENOBUFS;
1148
1149 /* I suppose that internal messages
1150 * do not require checksums */
1151
1152 skb->ip_summed = CHECKSUM_UNNECESSARY;
1153
1154#ifdef CONFIG_IPV6_PIMSM_V2
1155 if (assert == MRT6MSG_WHOLEPKT) {
1156 /* Ugly, but we have no choice with this interface.
1157 Duplicate old header, fix length etc.
1158 And all this only to mangle msg->im6_msgtype and
1159 to set msg->im6_mbz to "mbz" :-)
1160 */
1161 skb_push(skb, -skb_network_offset(pkt));
1162
1163 skb_push(skb, sizeof(*msg));
1164 skb_reset_transport_header(skb);
1165 msg = (struct mrt6msg *)skb_transport_header(skb);
1166 msg->im6_mbz = 0;
1167 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
1168 msg->im6_mif = mrt->mroute_reg_vif_num;
1169 msg->im6_pad = 0;
1170 msg->im6_src = ipv6_hdr(pkt)->saddr;
1171 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1172
1173 skb->ip_summed = CHECKSUM_UNNECESSARY;
1174 } else
1175#endif
1176 {
1177 /*
1178 * Copy the IP header
1179 */
1180
1181 skb_put(skb, sizeof(struct ipv6hdr));
1182 skb_reset_network_header(skb);
1183 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1184
1185 /*
1186 * Add our header
1187 */
1188 skb_put(skb, sizeof(*msg));
1189 skb_reset_transport_header(skb);
1190 msg = (struct mrt6msg *)skb_transport_header(skb);
1191
1192 msg->im6_mbz = 0;
1193 msg->im6_msgtype = assert;
1194 msg->im6_mif = mifi;
1195 msg->im6_pad = 0;
1196 msg->im6_src = ipv6_hdr(pkt)->saddr;
1197 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1198
1199 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1200 skb->ip_summed = CHECKSUM_UNNECESSARY;
1201 }
1202
1203 if (mrt->mroute6_sk == NULL) {
1204 kfree_skb(skb);
1205 return -EINVAL;
1206 }
1207
1208 /*
1209 * Deliver to user space multicast routing algorithms
1210 */
1211 ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb);
1212 if (ret < 0) {
1213 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
1214 kfree_skb(skb);
1215 }
1216
1217 return ret;
1218}
1219
1220/*
1221 * Queue a packet for resolution. It gets locked cache entry!
1222 */
1223
1224static int
1225ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb)
1226{
1227 bool found = false;
1228 int err;
1229 struct mfc6_cache *c;
1230
1231 spin_lock_bh(&mfc_unres_lock);
1232 list_for_each_entry(c, &mrt->mfc6_unres_queue, list) {
1233 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1234 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1235 found = true;
1236 break;
1237 }
1238 }
1239
1240 if (!found) {
1241 /*
1242 * Create a new entry if allowable
1243 */
1244
1245 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1246 (c = ip6mr_cache_alloc_unres()) == NULL) {
1247 spin_unlock_bh(&mfc_unres_lock);
1248
1249 kfree_skb(skb);
1250 return -ENOBUFS;
1251 }
1252
1253 /*
1254 * Fill in the new cache entry
1255 */
1256 c->mf6c_parent = -1;
1257 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1258 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1259
1260 /*
1261 * Reflect first query at pim6sd
1262 */
1263 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1264 if (err < 0) {
1265 /* If the report failed throw the cache entry
1266 out - Brad Parker
1267 */
1268 spin_unlock_bh(&mfc_unres_lock);
1269
1270 ip6mr_cache_free(c);
1271 kfree_skb(skb);
1272 return err;
1273 }
1274
1275 atomic_inc(&mrt->cache_resolve_queue_len);
1276 list_add(&c->list, &mrt->mfc6_unres_queue);
1277 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1278
1279 ipmr_do_expire_process(mrt);
1280 }
1281
1282 /*
1283 * See if we can append the packet
1284 */
1285 if (c->mfc_un.unres.unresolved.qlen > 3) {
1286 kfree_skb(skb);
1287 err = -ENOBUFS;
1288 } else {
1289 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1290 err = 0;
1291 }
1292
1293 spin_unlock_bh(&mfc_unres_lock);
1294 return err;
1295}
1296
1297/*
1298 * MFC6 cache manipulation by user space
1299 */
1300
1301static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc,
1302 int parent)
1303{
1304 int line;
1305 struct mfc6_cache *c, *next;
1306
1307 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1308
1309 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) {
1310 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1311 ipv6_addr_equal(&c->mf6c_mcastgrp,
1312 &mfc->mf6cc_mcastgrp.sin6_addr) &&
1313 (parent == -1 || parent == c->mf6c_parent)) {
1314 write_lock_bh(&mrt_lock);
1315 list_del(&c->list);
1316 write_unlock_bh(&mrt_lock);
1317
1318 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1319 ip6mr_cache_free(c);
1320 return 0;
1321 }
1322 }
1323 return -ENOENT;
1324}
1325
1326static int ip6mr_device_event(struct notifier_block *this,
1327 unsigned long event, void *ptr)
1328{
1329 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1330 struct net *net = dev_net(dev);
1331 struct mr6_table *mrt;
1332 struct mif_device *v;
1333 int ct;
1334 LIST_HEAD(list);
1335
1336 if (event != NETDEV_UNREGISTER)
1337 return NOTIFY_DONE;
1338
1339 ip6mr_for_each_table(mrt, net) {
1340 v = &mrt->vif6_table[0];
1341 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1342 if (v->dev == dev)
1343 mif6_delete(mrt, ct, &list);
1344 }
1345 }
1346 unregister_netdevice_many(&list);
1347
1348 return NOTIFY_DONE;
1349}
1350
1351static struct notifier_block ip6_mr_notifier = {
1352 .notifier_call = ip6mr_device_event
1353};
1354
1355/*
1356 * Setup for IP multicast routing
1357 */
1358
1359static int __net_init ip6mr_net_init(struct net *net)
1360{
1361 int err;
1362
1363 err = ip6mr_rules_init(net);
1364 if (err < 0)
1365 goto fail;
1366
1367#ifdef CONFIG_PROC_FS
1368 err = -ENOMEM;
1369 if (!proc_create("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_fops))
1370 goto proc_vif_fail;
1371 if (!proc_create("ip6_mr_cache", 0, net->proc_net, &ip6mr_mfc_fops))
1372 goto proc_cache_fail;
1373#endif
1374
1375 return 0;
1376
1377#ifdef CONFIG_PROC_FS
1378proc_cache_fail:
1379 remove_proc_entry("ip6_mr_vif", net->proc_net);
1380proc_vif_fail:
1381 ip6mr_rules_exit(net);
1382#endif
1383fail:
1384 return err;
1385}
1386
1387static void __net_exit ip6mr_net_exit(struct net *net)
1388{
1389#ifdef CONFIG_PROC_FS
1390 remove_proc_entry("ip6_mr_cache", net->proc_net);
1391 remove_proc_entry("ip6_mr_vif", net->proc_net);
1392#endif
1393 ip6mr_rules_exit(net);
1394}
1395
1396static struct pernet_operations ip6mr_net_ops = {
1397 .init = ip6mr_net_init,
1398 .exit = ip6mr_net_exit,
1399};
1400
1401int __init ip6_mr_init(void)
1402{
1403 int err;
1404
1405 mrt_cachep = kmem_cache_create("ip6_mrt_cache",
1406 sizeof(struct mfc6_cache),
1407 0, SLAB_HWCACHE_ALIGN,
1408 NULL);
1409 if (!mrt_cachep)
1410 return -ENOMEM;
1411
1412 err = register_pernet_subsys(&ip6mr_net_ops);
1413 if (err)
1414 goto reg_pernet_fail;
1415
1416 err = register_netdevice_notifier(&ip6_mr_notifier);
1417 if (err)
1418 goto reg_notif_fail;
1419#ifdef CONFIG_IPV6_PIMSM_V2
1420 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1421 pr_err("%s: can't add PIM protocol\n", __func__);
1422 err = -EAGAIN;
1423 goto add_proto_fail;
1424 }
1425#endif
1426 rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL,
1427 ip6mr_rtm_dumproute, NULL);
1428 return 0;
1429#ifdef CONFIG_IPV6_PIMSM_V2
1430add_proto_fail:
1431 unregister_netdevice_notifier(&ip6_mr_notifier);
1432#endif
1433reg_notif_fail:
1434 unregister_pernet_subsys(&ip6mr_net_ops);
1435reg_pernet_fail:
1436 kmem_cache_destroy(mrt_cachep);
1437 return err;
1438}
1439
1440void ip6_mr_cleanup(void)
1441{
1442 unregister_netdevice_notifier(&ip6_mr_notifier);
1443 unregister_pernet_subsys(&ip6mr_net_ops);
1444 kmem_cache_destroy(mrt_cachep);
1445}
1446
1447static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt,
1448 struct mf6cctl *mfc, int mrtsock, int parent)
1449{
1450 bool found = false;
1451 int line;
1452 struct mfc6_cache *uc, *c;
1453 unsigned char ttls[MAXMIFS];
1454 int i;
1455
1456 if (mfc->mf6cc_parent >= MAXMIFS)
1457 return -ENFILE;
1458
1459 memset(ttls, 255, MAXMIFS);
1460 for (i = 0; i < MAXMIFS; i++) {
1461 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1462 ttls[i] = 1;
1463
1464 }
1465
1466 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1467
1468 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1469 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1470 ipv6_addr_equal(&c->mf6c_mcastgrp,
1471 &mfc->mf6cc_mcastgrp.sin6_addr) &&
1472 (parent == -1 || parent == mfc->mf6cc_parent)) {
1473 found = true;
1474 break;
1475 }
1476 }
1477
1478 if (found) {
1479 write_lock_bh(&mrt_lock);
1480 c->mf6c_parent = mfc->mf6cc_parent;
1481 ip6mr_update_thresholds(mrt, c, ttls);
1482 if (!mrtsock)
1483 c->mfc_flags |= MFC_STATIC;
1484 write_unlock_bh(&mrt_lock);
1485 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1486 return 0;
1487 }
1488
1489 if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
1490 !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1491 return -EINVAL;
1492
1493 c = ip6mr_cache_alloc();
1494 if (c == NULL)
1495 return -ENOMEM;
1496
1497 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1498 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1499 c->mf6c_parent = mfc->mf6cc_parent;
1500 ip6mr_update_thresholds(mrt, c, ttls);
1501 if (!mrtsock)
1502 c->mfc_flags |= MFC_STATIC;
1503
1504 write_lock_bh(&mrt_lock);
1505 list_add(&c->list, &mrt->mfc6_cache_array[line]);
1506 write_unlock_bh(&mrt_lock);
1507
1508 /*
1509 * Check to see if we resolved a queued list. If so we
1510 * need to send on the frames and tidy up.
1511 */
1512 found = false;
1513 spin_lock_bh(&mfc_unres_lock);
1514 list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) {
1515 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1516 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1517 list_del(&uc->list);
1518 atomic_dec(&mrt->cache_resolve_queue_len);
1519 found = true;
1520 break;
1521 }
1522 }
1523 if (list_empty(&mrt->mfc6_unres_queue))
1524 del_timer(&mrt->ipmr_expire_timer);
1525 spin_unlock_bh(&mfc_unres_lock);
1526
1527 if (found) {
1528 ip6mr_cache_resolve(net, mrt, uc, c);
1529 ip6mr_cache_free(uc);
1530 }
1531 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1532 return 0;
1533}
1534
1535/*
1536 * Close the multicast socket, and clear the vif tables etc
1537 */
1538
1539static void mroute_clean_tables(struct mr6_table *mrt)
1540{
1541 int i;
1542 LIST_HEAD(list);
1543 struct mfc6_cache *c, *next;
1544
1545 /*
1546 * Shut down all active vif entries
1547 */
1548 for (i = 0; i < mrt->maxvif; i++) {
1549 if (!(mrt->vif6_table[i].flags & VIFF_STATIC))
1550 mif6_delete(mrt, i, &list);
1551 }
1552 unregister_netdevice_many(&list);
1553
1554 /*
1555 * Wipe the cache
1556 */
1557 for (i = 0; i < MFC6_LINES; i++) {
1558 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) {
1559 if (c->mfc_flags & MFC_STATIC)
1560 continue;
1561 write_lock_bh(&mrt_lock);
1562 list_del(&c->list);
1563 write_unlock_bh(&mrt_lock);
1564
1565 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1566 ip6mr_cache_free(c);
1567 }
1568 }
1569
1570 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1571 spin_lock_bh(&mfc_unres_lock);
1572 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
1573 list_del(&c->list);
1574 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1575 ip6mr_destroy_unres(mrt, c);
1576 }
1577 spin_unlock_bh(&mfc_unres_lock);
1578 }
1579}
1580
1581static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk)
1582{
1583 int err = 0;
1584 struct net *net = sock_net(sk);
1585
1586 rtnl_lock();
1587 write_lock_bh(&mrt_lock);
1588 if (likely(mrt->mroute6_sk == NULL)) {
1589 mrt->mroute6_sk = sk;
1590 net->ipv6.devconf_all->mc_forwarding++;
1591 inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
1592 NETCONFA_IFINDEX_ALL,
1593 net->ipv6.devconf_all);
1594 }
1595 else
1596 err = -EADDRINUSE;
1597 write_unlock_bh(&mrt_lock);
1598
1599 rtnl_unlock();
1600
1601 return err;
1602}
1603
1604int ip6mr_sk_done(struct sock *sk)
1605{
1606 int err = -EACCES;
1607 struct net *net = sock_net(sk);
1608 struct mr6_table *mrt;
1609
1610 rtnl_lock();
1611 ip6mr_for_each_table(mrt, net) {
1612 if (sk == mrt->mroute6_sk) {
1613 write_lock_bh(&mrt_lock);
1614 mrt->mroute6_sk = NULL;
1615 net->ipv6.devconf_all->mc_forwarding--;
1616 inet6_netconf_notify_devconf(net,
1617 NETCONFA_MC_FORWARDING,
1618 NETCONFA_IFINDEX_ALL,
1619 net->ipv6.devconf_all);
1620 write_unlock_bh(&mrt_lock);
1621
1622 mroute_clean_tables(mrt);
1623 err = 0;
1624 break;
1625 }
1626 }
1627 rtnl_unlock();
1628
1629 return err;
1630}
1631
1632struct sock *mroute6_socket(struct net *net, struct sk_buff *skb)
1633{
1634 struct mr6_table *mrt;
1635 struct flowi6 fl6 = {
1636 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
1637 .flowi6_oif = skb->dev->ifindex,
1638 .flowi6_mark = skb->mark,
1639 };
1640
1641 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1642 return NULL;
1643
1644 return mrt->mroute6_sk;
1645}
1646
1647/*
1648 * Socket options and virtual interface manipulation. The whole
1649 * virtual interface system is a complete heap, but unfortunately
1650 * that's how BSD mrouted happens to think. Maybe one day with a proper
1651 * MOSPF/PIM router set up we can clean this up.
1652 */
1653
1654int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1655{
1656 int ret, parent = 0;
1657 struct mif6ctl vif;
1658 struct mf6cctl mfc;
1659 mifi_t mifi;
1660 struct net *net = sock_net(sk);
1661 struct mr6_table *mrt;
1662
1663 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1664 if (mrt == NULL)
1665 return -ENOENT;
1666
1667 if (optname != MRT6_INIT) {
1668 if (sk != mrt->mroute6_sk && !ns_capable(net->user_ns, CAP_NET_ADMIN))
1669 return -EACCES;
1670 }
1671
1672 switch (optname) {
1673 case MRT6_INIT:
1674 if (sk->sk_type != SOCK_RAW ||
1675 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1676 return -EOPNOTSUPP;
1677 if (optlen < sizeof(int))
1678 return -EINVAL;
1679
1680 return ip6mr_sk_init(mrt, sk);
1681
1682 case MRT6_DONE:
1683 return ip6mr_sk_done(sk);
1684
1685 case MRT6_ADD_MIF:
1686 if (optlen < sizeof(vif))
1687 return -EINVAL;
1688 if (copy_from_user(&vif, optval, sizeof(vif)))
1689 return -EFAULT;
1690 if (vif.mif6c_mifi >= MAXMIFS)
1691 return -ENFILE;
1692 rtnl_lock();
1693 ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk);
1694 rtnl_unlock();
1695 return ret;
1696
1697 case MRT6_DEL_MIF:
1698 if (optlen < sizeof(mifi_t))
1699 return -EINVAL;
1700 if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
1701 return -EFAULT;
1702 rtnl_lock();
1703 ret = mif6_delete(mrt, mifi, NULL);
1704 rtnl_unlock();
1705 return ret;
1706
1707 /*
1708 * Manipulate the forwarding caches. These live
1709 * in a sort of kernel/user symbiosis.
1710 */
1711 case MRT6_ADD_MFC:
1712 case MRT6_DEL_MFC:
1713 parent = -1;
1714 case MRT6_ADD_MFC_PROXY:
1715 case MRT6_DEL_MFC_PROXY:
1716 if (optlen < sizeof(mfc))
1717 return -EINVAL;
1718 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1719 return -EFAULT;
1720 if (parent == 0)
1721 parent = mfc.mf6cc_parent;
1722 rtnl_lock();
1723 if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
1724 ret = ip6mr_mfc_delete(mrt, &mfc, parent);
1725 else
1726 ret = ip6mr_mfc_add(net, mrt, &mfc,
1727 sk == mrt->mroute6_sk, parent);
1728 rtnl_unlock();
1729 return ret;
1730
1731 /*
1732 * Control PIM assert (to activate pim will activate assert)
1733 */
1734 case MRT6_ASSERT:
1735 {
1736 int v;
1737
1738 if (optlen != sizeof(v))
1739 return -EINVAL;
1740 if (get_user(v, (int __user *)optval))
1741 return -EFAULT;
1742 mrt->mroute_do_assert = v;
1743 return 0;
1744 }
1745
1746#ifdef CONFIG_IPV6_PIMSM_V2
1747 case MRT6_PIM:
1748 {
1749 int v;
1750
1751 if (optlen != sizeof(v))
1752 return -EINVAL;
1753 if (get_user(v, (int __user *)optval))
1754 return -EFAULT;
1755 v = !!v;
1756 rtnl_lock();
1757 ret = 0;
1758 if (v != mrt->mroute_do_pim) {
1759 mrt->mroute_do_pim = v;
1760 mrt->mroute_do_assert = v;
1761 }
1762 rtnl_unlock();
1763 return ret;
1764 }
1765
1766#endif
1767#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1768 case MRT6_TABLE:
1769 {
1770 u32 v;
1771
1772 if (optlen != sizeof(u32))
1773 return -EINVAL;
1774 if (get_user(v, (u32 __user *)optval))
1775 return -EFAULT;
1776 /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
1777 if (v != RT_TABLE_DEFAULT && v >= 100000000)
1778 return -EINVAL;
1779 if (sk == mrt->mroute6_sk)
1780 return -EBUSY;
1781
1782 rtnl_lock();
1783 ret = 0;
1784 if (!ip6mr_new_table(net, v))
1785 ret = -ENOMEM;
1786 raw6_sk(sk)->ip6mr_table = v;
1787 rtnl_unlock();
1788 return ret;
1789 }
1790#endif
1791 /*
1792 * Spurious command, or MRT6_VERSION which you cannot
1793 * set.
1794 */
1795 default:
1796 return -ENOPROTOOPT;
1797 }
1798}
1799
1800/*
1801 * Getsock opt support for the multicast routing system.
1802 */
1803
1804int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1805 int __user *optlen)
1806{
1807 int olr;
1808 int val;
1809 struct net *net = sock_net(sk);
1810 struct mr6_table *mrt;
1811
1812 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1813 if (mrt == NULL)
1814 return -ENOENT;
1815
1816 switch (optname) {
1817 case MRT6_VERSION:
1818 val = 0x0305;
1819 break;
1820#ifdef CONFIG_IPV6_PIMSM_V2
1821 case MRT6_PIM:
1822 val = mrt->mroute_do_pim;
1823 break;
1824#endif
1825 case MRT6_ASSERT:
1826 val = mrt->mroute_do_assert;
1827 break;
1828 default:
1829 return -ENOPROTOOPT;
1830 }
1831
1832 if (get_user(olr, optlen))
1833 return -EFAULT;
1834
1835 olr = min_t(int, olr, sizeof(int));
1836 if (olr < 0)
1837 return -EINVAL;
1838
1839 if (put_user(olr, optlen))
1840 return -EFAULT;
1841 if (copy_to_user(optval, &val, olr))
1842 return -EFAULT;
1843 return 0;
1844}
1845
1846/*
1847 * The IP multicast ioctl support routines.
1848 */
1849
1850int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1851{
1852 struct sioc_sg_req6 sr;
1853 struct sioc_mif_req6 vr;
1854 struct mif_device *vif;
1855 struct mfc6_cache *c;
1856 struct net *net = sock_net(sk);
1857 struct mr6_table *mrt;
1858
1859 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1860 if (mrt == NULL)
1861 return -ENOENT;
1862
1863 switch (cmd) {
1864 case SIOCGETMIFCNT_IN6:
1865 if (copy_from_user(&vr, arg, sizeof(vr)))
1866 return -EFAULT;
1867 if (vr.mifi >= mrt->maxvif)
1868 return -EINVAL;
1869 read_lock(&mrt_lock);
1870 vif = &mrt->vif6_table[vr.mifi];
1871 if (MIF_EXISTS(mrt, vr.mifi)) {
1872 vr.icount = vif->pkt_in;
1873 vr.ocount = vif->pkt_out;
1874 vr.ibytes = vif->bytes_in;
1875 vr.obytes = vif->bytes_out;
1876 read_unlock(&mrt_lock);
1877
1878 if (copy_to_user(arg, &vr, sizeof(vr)))
1879 return -EFAULT;
1880 return 0;
1881 }
1882 read_unlock(&mrt_lock);
1883 return -EADDRNOTAVAIL;
1884 case SIOCGETSGCNT_IN6:
1885 if (copy_from_user(&sr, arg, sizeof(sr)))
1886 return -EFAULT;
1887
1888 read_lock(&mrt_lock);
1889 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1890 if (c) {
1891 sr.pktcnt = c->mfc_un.res.pkt;
1892 sr.bytecnt = c->mfc_un.res.bytes;
1893 sr.wrong_if = c->mfc_un.res.wrong_if;
1894 read_unlock(&mrt_lock);
1895
1896 if (copy_to_user(arg, &sr, sizeof(sr)))
1897 return -EFAULT;
1898 return 0;
1899 }
1900 read_unlock(&mrt_lock);
1901 return -EADDRNOTAVAIL;
1902 default:
1903 return -ENOIOCTLCMD;
1904 }
1905}
1906
1907#ifdef CONFIG_COMPAT
1908struct compat_sioc_sg_req6 {
1909 struct sockaddr_in6 src;
1910 struct sockaddr_in6 grp;
1911 compat_ulong_t pktcnt;
1912 compat_ulong_t bytecnt;
1913 compat_ulong_t wrong_if;
1914};
1915
1916struct compat_sioc_mif_req6 {
1917 mifi_t mifi;
1918 compat_ulong_t icount;
1919 compat_ulong_t ocount;
1920 compat_ulong_t ibytes;
1921 compat_ulong_t obytes;
1922};
1923
1924int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1925{
1926 struct compat_sioc_sg_req6 sr;
1927 struct compat_sioc_mif_req6 vr;
1928 struct mif_device *vif;
1929 struct mfc6_cache *c;
1930 struct net *net = sock_net(sk);
1931 struct mr6_table *mrt;
1932
1933 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1934 if (mrt == NULL)
1935 return -ENOENT;
1936
1937 switch (cmd) {
1938 case SIOCGETMIFCNT_IN6:
1939 if (copy_from_user(&vr, arg, sizeof(vr)))
1940 return -EFAULT;
1941 if (vr.mifi >= mrt->maxvif)
1942 return -EINVAL;
1943 read_lock(&mrt_lock);
1944 vif = &mrt->vif6_table[vr.mifi];
1945 if (MIF_EXISTS(mrt, vr.mifi)) {
1946 vr.icount = vif->pkt_in;
1947 vr.ocount = vif->pkt_out;
1948 vr.ibytes = vif->bytes_in;
1949 vr.obytes = vif->bytes_out;
1950 read_unlock(&mrt_lock);
1951
1952 if (copy_to_user(arg, &vr, sizeof(vr)))
1953 return -EFAULT;
1954 return 0;
1955 }
1956 read_unlock(&mrt_lock);
1957 return -EADDRNOTAVAIL;
1958 case SIOCGETSGCNT_IN6:
1959 if (copy_from_user(&sr, arg, sizeof(sr)))
1960 return -EFAULT;
1961
1962 read_lock(&mrt_lock);
1963 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1964 if (c) {
1965 sr.pktcnt = c->mfc_un.res.pkt;
1966 sr.bytecnt = c->mfc_un.res.bytes;
1967 sr.wrong_if = c->mfc_un.res.wrong_if;
1968 read_unlock(&mrt_lock);
1969
1970 if (copy_to_user(arg, &sr, sizeof(sr)))
1971 return -EFAULT;
1972 return 0;
1973 }
1974 read_unlock(&mrt_lock);
1975 return -EADDRNOTAVAIL;
1976 default:
1977 return -ENOIOCTLCMD;
1978 }
1979}
1980#endif
1981
1982static inline int ip6mr_forward2_finish(struct sk_buff *skb)
1983{
1984 IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
1985 IPSTATS_MIB_OUTFORWDATAGRAMS);
1986 IP6_ADD_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
1987 IPSTATS_MIB_OUTOCTETS, skb->len);
1988 return dst_output(skb);
1989}
1990
1991/*
1992 * Processing handlers for ip6mr_forward
1993 */
1994
1995static int ip6mr_forward2(struct net *net, struct mr6_table *mrt,
1996 struct sk_buff *skb, struct mfc6_cache *c, int vifi)
1997{
1998 struct ipv6hdr *ipv6h;
1999 struct mif_device *vif = &mrt->vif6_table[vifi];
2000 struct net_device *dev;
2001 struct dst_entry *dst;
2002 struct flowi6 fl6;
2003
2004 if (vif->dev == NULL)
2005 goto out_free;
2006
2007#ifdef CONFIG_IPV6_PIMSM_V2
2008 if (vif->flags & MIFF_REGISTER) {
2009 vif->pkt_out++;
2010 vif->bytes_out += skb->len;
2011 vif->dev->stats.tx_bytes += skb->len;
2012 vif->dev->stats.tx_packets++;
2013 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
2014 goto out_free;
2015 }
2016#endif
2017
2018 ipv6h = ipv6_hdr(skb);
2019
2020 fl6 = (struct flowi6) {
2021 .flowi6_oif = vif->link,
2022 .daddr = ipv6h->daddr,
2023 };
2024
2025 dst = ip6_route_output(net, NULL, &fl6);
2026 if (dst->error) {
2027 dst_release(dst);
2028 goto out_free;
2029 }
2030
2031 skb_dst_drop(skb);
2032 skb_dst_set(skb, dst);
2033
2034 /*
2035 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
2036 * not only before forwarding, but after forwarding on all output
2037 * interfaces. It is clear, if mrouter runs a multicasting
2038 * program, it should receive packets not depending to what interface
2039 * program is joined.
2040 * If we will not make it, the program will have to join on all
2041 * interfaces. On the other hand, multihoming host (or router, but
2042 * not mrouter) cannot join to more than one interface - it will
2043 * result in receiving multiple packets.
2044 */
2045 dev = vif->dev;
2046 skb->dev = dev;
2047 vif->pkt_out++;
2048 vif->bytes_out += skb->len;
2049
2050 /* We are about to write */
2051 /* XXX: extension headers? */
2052 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
2053 goto out_free;
2054
2055 ipv6h = ipv6_hdr(skb);
2056 ipv6h->hop_limit--;
2057
2058 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
2059
2060 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dev,
2061 ip6mr_forward2_finish);
2062
2063out_free:
2064 kfree_skb(skb);
2065 return 0;
2066}
2067
2068static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev)
2069{
2070 int ct;
2071
2072 for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
2073 if (mrt->vif6_table[ct].dev == dev)
2074 break;
2075 }
2076 return ct;
2077}
2078
2079static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
2080 struct sk_buff *skb, struct mfc6_cache *cache)
2081{
2082 int psend = -1;
2083 int vif, ct;
2084 int true_vifi = ip6mr_find_vif(mrt, skb->dev);
2085
2086 vif = cache->mf6c_parent;
2087 cache->mfc_un.res.pkt++;
2088 cache->mfc_un.res.bytes += skb->len;
2089
2090 if (ipv6_addr_any(&cache->mf6c_origin) && true_vifi >= 0) {
2091 struct mfc6_cache *cache_proxy;
2092
2093 /* For an (*,G) entry, we only check that the incomming
2094 * interface is part of the static tree.
2095 */
2096 cache_proxy = ip6mr_cache_find_any_parent(mrt, vif);
2097 if (cache_proxy &&
2098 cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
2099 goto forward;
2100 }
2101
2102 /*
2103 * Wrong interface: drop packet and (maybe) send PIM assert.
2104 */
2105 if (mrt->vif6_table[vif].dev != skb->dev) {
2106 cache->mfc_un.res.wrong_if++;
2107
2108 if (true_vifi >= 0 && mrt->mroute_do_assert &&
2109 /* pimsm uses asserts, when switching from RPT to SPT,
2110 so that we cannot check that packet arrived on an oif.
2111 It is bad, but otherwise we would need to move pretty
2112 large chunk of pimd to kernel. Ough... --ANK
2113 */
2114 (mrt->mroute_do_pim ||
2115 cache->mfc_un.res.ttls[true_vifi] < 255) &&
2116 time_after(jiffies,
2117 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
2118 cache->mfc_un.res.last_assert = jiffies;
2119 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2120 }
2121 goto dont_forward;
2122 }
2123
2124forward:
2125 mrt->vif6_table[vif].pkt_in++;
2126 mrt->vif6_table[vif].bytes_in += skb->len;
2127
2128 /*
2129 * Forward the frame
2130 */
2131 if (ipv6_addr_any(&cache->mf6c_origin) &&
2132 ipv6_addr_any(&cache->mf6c_mcastgrp)) {
2133 if (true_vifi >= 0 &&
2134 true_vifi != cache->mf6c_parent &&
2135 ipv6_hdr(skb)->hop_limit >
2136 cache->mfc_un.res.ttls[cache->mf6c_parent]) {
2137 /* It's an (*,*) entry and the packet is not coming from
2138 * the upstream: forward the packet to the upstream
2139 * only.
2140 */
2141 psend = cache->mf6c_parent;
2142 goto last_forward;
2143 }
2144 goto dont_forward;
2145 }
2146 for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
2147 /* For (*,G) entry, don't forward to the incoming interface */
2148 if ((!ipv6_addr_any(&cache->mf6c_origin) || ct != true_vifi) &&
2149 ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
2150 if (psend != -1) {
2151 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2152 if (skb2)
2153 ip6mr_forward2(net, mrt, skb2, cache, psend);
2154 }
2155 psend = ct;
2156 }
2157 }
2158last_forward:
2159 if (psend != -1) {
2160 ip6mr_forward2(net, mrt, skb, cache, psend);
2161 return;
2162 }
2163
2164dont_forward:
2165 kfree_skb(skb);
2166}
2167
2168
2169/*
2170 * Multicast packets for forwarding arrive here
2171 */
2172
2173int ip6_mr_input(struct sk_buff *skb)
2174{
2175 struct mfc6_cache *cache;
2176 struct net *net = dev_net(skb->dev);
2177 struct mr6_table *mrt;
2178 struct flowi6 fl6 = {
2179 .flowi6_iif = skb->dev->ifindex,
2180 .flowi6_mark = skb->mark,
2181 };
2182 int err;
2183
2184 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2185 if (err < 0) {
2186 kfree_skb(skb);
2187 return err;
2188 }
2189
2190 read_lock(&mrt_lock);
2191 cache = ip6mr_cache_find(mrt,
2192 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2193 if (cache == NULL) {
2194 int vif = ip6mr_find_vif(mrt, skb->dev);
2195
2196 if (vif >= 0)
2197 cache = ip6mr_cache_find_any(mrt,
2198 &ipv6_hdr(skb)->daddr,
2199 vif);
2200 }
2201
2202 /*
2203 * No usable cache entry
2204 */
2205 if (cache == NULL) {
2206 int vif;
2207
2208 vif = ip6mr_find_vif(mrt, skb->dev);
2209 if (vif >= 0) {
2210 int err = ip6mr_cache_unresolved(mrt, vif, skb);
2211 read_unlock(&mrt_lock);
2212
2213 return err;
2214 }
2215 read_unlock(&mrt_lock);
2216 kfree_skb(skb);
2217 return -ENODEV;
2218 }
2219
2220 ip6_mr_forward(net, mrt, skb, cache);
2221
2222 read_unlock(&mrt_lock);
2223
2224 return 0;
2225}
2226
2227
2228static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2229 struct mfc6_cache *c, struct rtmsg *rtm)
2230{
2231 int ct;
2232 struct rtnexthop *nhp;
2233 struct nlattr *mp_attr;
2234 struct rta_mfc_stats mfcs;
2235
2236 /* If cache is unresolved, don't try to parse IIF and OIF */
2237 if (c->mf6c_parent >= MAXMIFS)
2238 return -ENOENT;
2239
2240 if (MIF_EXISTS(mrt, c->mf6c_parent) &&
2241 nla_put_u32(skb, RTA_IIF, mrt->vif6_table[c->mf6c_parent].dev->ifindex) < 0)
2242 return -EMSGSIZE;
2243 mp_attr = nla_nest_start(skb, RTA_MULTIPATH);
2244 if (mp_attr == NULL)
2245 return -EMSGSIZE;
2246
2247 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2248 if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2249 nhp = nla_reserve_nohdr(skb, sizeof(*nhp));
2250 if (nhp == NULL) {
2251 nla_nest_cancel(skb, mp_attr);
2252 return -EMSGSIZE;
2253 }
2254
2255 nhp->rtnh_flags = 0;
2256 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2257 nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex;
2258 nhp->rtnh_len = sizeof(*nhp);
2259 }
2260 }
2261
2262 nla_nest_end(skb, mp_attr);
2263
2264 mfcs.mfcs_packets = c->mfc_un.res.pkt;
2265 mfcs.mfcs_bytes = c->mfc_un.res.bytes;
2266 mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
2267 if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0)
2268 return -EMSGSIZE;
2269
2270 rtm->rtm_type = RTN_MULTICAST;
2271 return 1;
2272}
2273
2274int ip6mr_get_route(struct net *net,
2275 struct sk_buff *skb, struct rtmsg *rtm, int nowait)
2276{
2277 int err;
2278 struct mr6_table *mrt;
2279 struct mfc6_cache *cache;
2280 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
2281
2282 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2283 if (mrt == NULL)
2284 return -ENOENT;
2285
2286 read_lock(&mrt_lock);
2287 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2288 if (!cache && skb->dev) {
2289 int vif = ip6mr_find_vif(mrt, skb->dev);
2290
2291 if (vif >= 0)
2292 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
2293 vif);
2294 }
2295
2296 if (!cache) {
2297 struct sk_buff *skb2;
2298 struct ipv6hdr *iph;
2299 struct net_device *dev;
2300 int vif;
2301
2302 if (nowait) {
2303 read_unlock(&mrt_lock);
2304 return -EAGAIN;
2305 }
2306
2307 dev = skb->dev;
2308 if (dev == NULL || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2309 read_unlock(&mrt_lock);
2310 return -ENODEV;
2311 }
2312
2313 /* really correct? */
2314 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2315 if (!skb2) {
2316 read_unlock(&mrt_lock);
2317 return -ENOMEM;
2318 }
2319
2320 skb_reset_transport_header(skb2);
2321
2322 skb_put(skb2, sizeof(struct ipv6hdr));
2323 skb_reset_network_header(skb2);
2324
2325 iph = ipv6_hdr(skb2);
2326 iph->version = 0;
2327 iph->priority = 0;
2328 iph->flow_lbl[0] = 0;
2329 iph->flow_lbl[1] = 0;
2330 iph->flow_lbl[2] = 0;
2331 iph->payload_len = 0;
2332 iph->nexthdr = IPPROTO_NONE;
2333 iph->hop_limit = 0;
2334 iph->saddr = rt->rt6i_src.addr;
2335 iph->daddr = rt->rt6i_dst.addr;
2336
2337 err = ip6mr_cache_unresolved(mrt, vif, skb2);
2338 read_unlock(&mrt_lock);
2339
2340 return err;
2341 }
2342
2343 if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
2344 cache->mfc_flags |= MFC_NOTIFY;
2345
2346 err = __ip6mr_fill_mroute(mrt, skb, cache, rtm);
2347 read_unlock(&mrt_lock);
2348 return err;
2349}
2350
2351static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2352 u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
2353 int flags)
2354{
2355 struct nlmsghdr *nlh;
2356 struct rtmsg *rtm;
2357 int err;
2358
2359 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2360 if (nlh == NULL)
2361 return -EMSGSIZE;
2362
2363 rtm = nlmsg_data(nlh);
2364 rtm->rtm_family = RTNL_FAMILY_IP6MR;
2365 rtm->rtm_dst_len = 128;
2366 rtm->rtm_src_len = 128;
2367 rtm->rtm_tos = 0;
2368 rtm->rtm_table = mrt->id;
2369 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2370 goto nla_put_failure;
2371 rtm->rtm_type = RTN_MULTICAST;
2372 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2373 if (c->mfc_flags & MFC_STATIC)
2374 rtm->rtm_protocol = RTPROT_STATIC;
2375 else
2376 rtm->rtm_protocol = RTPROT_MROUTED;
2377 rtm->rtm_flags = 0;
2378
2379 if (nla_put(skb, RTA_SRC, 16, &c->mf6c_origin) ||
2380 nla_put(skb, RTA_DST, 16, &c->mf6c_mcastgrp))
2381 goto nla_put_failure;
2382 err = __ip6mr_fill_mroute(mrt, skb, c, rtm);
2383 /* do not break the dump if cache is unresolved */
2384 if (err < 0 && err != -ENOENT)
2385 goto nla_put_failure;
2386
2387 return nlmsg_end(skb, nlh);
2388
2389nla_put_failure:
2390 nlmsg_cancel(skb, nlh);
2391 return -EMSGSIZE;
2392}
2393
2394static int mr6_msgsize(bool unresolved, int maxvif)
2395{
2396 size_t len =
2397 NLMSG_ALIGN(sizeof(struct rtmsg))
2398 + nla_total_size(4) /* RTA_TABLE */
2399 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
2400 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
2401 ;
2402
2403 if (!unresolved)
2404 len = len
2405 + nla_total_size(4) /* RTA_IIF */
2406 + nla_total_size(0) /* RTA_MULTIPATH */
2407 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2408 /* RTA_MFC_STATS */
2409 + nla_total_size(sizeof(struct rta_mfc_stats))
2410 ;
2411
2412 return len;
2413}
2414
2415static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
2416 int cmd)
2417{
2418 struct net *net = read_pnet(&mrt->net);
2419 struct sk_buff *skb;
2420 int err = -ENOBUFS;
2421
2422 skb = nlmsg_new(mr6_msgsize(mfc->mf6c_parent >= MAXMIFS, mrt->maxvif),
2423 GFP_ATOMIC);
2424 if (skb == NULL)
2425 goto errout;
2426
2427 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2428 if (err < 0)
2429 goto errout;
2430
2431 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
2432 return;
2433
2434errout:
2435 kfree_skb(skb);
2436 if (err < 0)
2437 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
2438}
2439
2440static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2441{
2442 struct net *net = sock_net(skb->sk);
2443 struct mr6_table *mrt;
2444 struct mfc6_cache *mfc;
2445 unsigned int t = 0, s_t;
2446 unsigned int h = 0, s_h;
2447 unsigned int e = 0, s_e;
2448
2449 s_t = cb->args[0];
2450 s_h = cb->args[1];
2451 s_e = cb->args[2];
2452
2453 read_lock(&mrt_lock);
2454 ip6mr_for_each_table(mrt, net) {
2455 if (t < s_t)
2456 goto next_table;
2457 if (t > s_t)
2458 s_h = 0;
2459 for (h = s_h; h < MFC6_LINES; h++) {
2460 list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) {
2461 if (e < s_e)
2462 goto next_entry;
2463 if (ip6mr_fill_mroute(mrt, skb,
2464 NETLINK_CB(cb->skb).portid,
2465 cb->nlh->nlmsg_seq,
2466 mfc, RTM_NEWROUTE,
2467 NLM_F_MULTI) < 0)
2468 goto done;
2469next_entry:
2470 e++;
2471 }
2472 e = s_e = 0;
2473 }
2474 spin_lock_bh(&mfc_unres_lock);
2475 list_for_each_entry(mfc, &mrt->mfc6_unres_queue, list) {
2476 if (e < s_e)
2477 goto next_entry2;
2478 if (ip6mr_fill_mroute(mrt, skb,
2479 NETLINK_CB(cb->skb).portid,
2480 cb->nlh->nlmsg_seq,
2481 mfc, RTM_NEWROUTE,
2482 NLM_F_MULTI) < 0) {
2483 spin_unlock_bh(&mfc_unres_lock);
2484 goto done;
2485 }
2486next_entry2:
2487 e++;
2488 }
2489 spin_unlock_bh(&mfc_unres_lock);
2490 e = s_e = 0;
2491 s_h = 0;
2492next_table:
2493 t++;
2494 }
2495done:
2496 read_unlock(&mrt_lock);
2497
2498 cb->args[2] = e;
2499 cb->args[1] = h;
2500 cb->args[0] = t;
2501
2502 return skb->len;
2503}