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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 <linux/uaccess.h>
20#include <linux/types.h>
21#include <linux/sched.h>
22#include <linux/errno.h>
23#include <linux/mm.h>
24#include <linux/kernel.h>
25#include <linux/fcntl.h>
26#include <linux/stat.h>
27#include <linux/socket.h>
28#include <linux/inet.h>
29#include <linux/netdevice.h>
30#include <linux/inetdevice.h>
31#include <linux/proc_fs.h>
32#include <linux/seq_file.h>
33#include <linux/init.h>
34#include <linux/compat.h>
35#include <net/protocol.h>
36#include <linux/skbuff.h>
37#include <net/raw.h>
38#include <linux/notifier.h>
39#include <linux/if_arp.h>
40#include <net/checksum.h>
41#include <net/netlink.h>
42#include <net/fib_rules.h>
43
44#include <net/ipv6.h>
45#include <net/ip6_route.h>
46#include <linux/mroute6.h>
47#include <linux/pim.h>
48#include <net/addrconf.h>
49#include <linux/netfilter_ipv6.h>
50#include <linux/export.h>
51#include <net/ip6_checksum.h>
52#include <linux/netconf.h>
53
54struct ip6mr_rule {
55 struct fib_rule common;
56};
57
58struct ip6mr_result {
59 struct mr_table *mrt;
60};
61
62/* Big lock, protecting vif table, mrt cache and mroute socket state.
63 Note that the changes are semaphored via rtnl_lock.
64 */
65
66static DEFINE_RWLOCK(mrt_lock);
67
68/* Multicast router control variables */
69
70/* Special spinlock for queue of unresolved entries */
71static DEFINE_SPINLOCK(mfc_unres_lock);
72
73/* We return to original Alan's scheme. Hash table of resolved
74 entries is changed only in process context and protected
75 with weak lock mrt_lock. Queue of unresolved entries is protected
76 with strong spinlock mfc_unres_lock.
77
78 In this case data path is free of exclusive locks at all.
79 */
80
81static struct kmem_cache *mrt_cachep __read_mostly;
82
83static struct mr_table *ip6mr_new_table(struct net *net, u32 id);
84static void ip6mr_free_table(struct mr_table *mrt);
85
86static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
87 struct sk_buff *skb, struct mfc6_cache *cache);
88static int ip6mr_cache_report(struct mr_table *mrt, struct sk_buff *pkt,
89 mifi_t mifi, int assert);
90static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
91 int cmd);
92static void mrt6msg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt);
93static int ip6mr_rtm_dumproute(struct sk_buff *skb,
94 struct netlink_callback *cb);
95static void mroute_clean_tables(struct mr_table *mrt, bool all);
96static void ipmr_expire_process(struct timer_list *t);
97
98#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
99#define ip6mr_for_each_table(mrt, net) \
100 list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list)
101
102static struct mr_table *ip6mr_mr_table_iter(struct net *net,
103 struct mr_table *mrt)
104{
105 struct mr_table *ret;
106
107 if (!mrt)
108 ret = list_entry_rcu(net->ipv6.mr6_tables.next,
109 struct mr_table, list);
110 else
111 ret = list_entry_rcu(mrt->list.next,
112 struct mr_table, list);
113
114 if (&ret->list == &net->ipv6.mr6_tables)
115 return NULL;
116 return ret;
117}
118
119static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
120{
121 struct mr_table *mrt;
122
123 ip6mr_for_each_table(mrt, net) {
124 if (mrt->id == id)
125 return mrt;
126 }
127 return NULL;
128}
129
130static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
131 struct mr_table **mrt)
132{
133 int err;
134 struct ip6mr_result res;
135 struct fib_lookup_arg arg = {
136 .result = &res,
137 .flags = FIB_LOOKUP_NOREF,
138 };
139
140 err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
141 flowi6_to_flowi(flp6), 0, &arg);
142 if (err < 0)
143 return err;
144 *mrt = res.mrt;
145 return 0;
146}
147
148static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
149 int flags, struct fib_lookup_arg *arg)
150{
151 struct ip6mr_result *res = arg->result;
152 struct mr_table *mrt;
153
154 switch (rule->action) {
155 case FR_ACT_TO_TBL:
156 break;
157 case FR_ACT_UNREACHABLE:
158 return -ENETUNREACH;
159 case FR_ACT_PROHIBIT:
160 return -EACCES;
161 case FR_ACT_BLACKHOLE:
162 default:
163 return -EINVAL;
164 }
165
166 mrt = ip6mr_get_table(rule->fr_net, rule->table);
167 if (!mrt)
168 return -EAGAIN;
169 res->mrt = mrt;
170 return 0;
171}
172
173static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
174{
175 return 1;
176}
177
178static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = {
179 FRA_GENERIC_POLICY,
180};
181
182static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
183 struct fib_rule_hdr *frh, struct nlattr **tb)
184{
185 return 0;
186}
187
188static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
189 struct nlattr **tb)
190{
191 return 1;
192}
193
194static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
195 struct fib_rule_hdr *frh)
196{
197 frh->dst_len = 0;
198 frh->src_len = 0;
199 frh->tos = 0;
200 return 0;
201}
202
203static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
204 .family = RTNL_FAMILY_IP6MR,
205 .rule_size = sizeof(struct ip6mr_rule),
206 .addr_size = sizeof(struct in6_addr),
207 .action = ip6mr_rule_action,
208 .match = ip6mr_rule_match,
209 .configure = ip6mr_rule_configure,
210 .compare = ip6mr_rule_compare,
211 .fill = ip6mr_rule_fill,
212 .nlgroup = RTNLGRP_IPV6_RULE,
213 .policy = ip6mr_rule_policy,
214 .owner = THIS_MODULE,
215};
216
217static int __net_init ip6mr_rules_init(struct net *net)
218{
219 struct fib_rules_ops *ops;
220 struct mr_table *mrt;
221 int err;
222
223 ops = fib_rules_register(&ip6mr_rules_ops_template, net);
224 if (IS_ERR(ops))
225 return PTR_ERR(ops);
226
227 INIT_LIST_HEAD(&net->ipv6.mr6_tables);
228
229 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
230 if (!mrt) {
231 err = -ENOMEM;
232 goto err1;
233 }
234
235 err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
236 if (err < 0)
237 goto err2;
238
239 net->ipv6.mr6_rules_ops = ops;
240 return 0;
241
242err2:
243 ip6mr_free_table(mrt);
244err1:
245 fib_rules_unregister(ops);
246 return err;
247}
248
249static void __net_exit ip6mr_rules_exit(struct net *net)
250{
251 struct mr_table *mrt, *next;
252
253 rtnl_lock();
254 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
255 list_del(&mrt->list);
256 ip6mr_free_table(mrt);
257 }
258 fib_rules_unregister(net->ipv6.mr6_rules_ops);
259 rtnl_unlock();
260}
261
262static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb)
263{
264 return fib_rules_dump(net, nb, RTNL_FAMILY_IP6MR);
265}
266
267static unsigned int ip6mr_rules_seq_read(struct net *net)
268{
269 return fib_rules_seq_read(net, RTNL_FAMILY_IP6MR);
270}
271
272bool ip6mr_rule_default(const struct fib_rule *rule)
273{
274 return fib_rule_matchall(rule) && rule->action == FR_ACT_TO_TBL &&
275 rule->table == RT6_TABLE_DFLT && !rule->l3mdev;
276}
277EXPORT_SYMBOL(ip6mr_rule_default);
278#else
279#define ip6mr_for_each_table(mrt, net) \
280 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
281
282static struct mr_table *ip6mr_mr_table_iter(struct net *net,
283 struct mr_table *mrt)
284{
285 if (!mrt)
286 return net->ipv6.mrt6;
287 return NULL;
288}
289
290static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
291{
292 return net->ipv6.mrt6;
293}
294
295static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
296 struct mr_table **mrt)
297{
298 *mrt = net->ipv6.mrt6;
299 return 0;
300}
301
302static int __net_init ip6mr_rules_init(struct net *net)
303{
304 net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT);
305 return net->ipv6.mrt6 ? 0 : -ENOMEM;
306}
307
308static void __net_exit ip6mr_rules_exit(struct net *net)
309{
310 rtnl_lock();
311 ip6mr_free_table(net->ipv6.mrt6);
312 net->ipv6.mrt6 = NULL;
313 rtnl_unlock();
314}
315
316static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb)
317{
318 return 0;
319}
320
321static unsigned int ip6mr_rules_seq_read(struct net *net)
322{
323 return 0;
324}
325#endif
326
327static int ip6mr_hash_cmp(struct rhashtable_compare_arg *arg,
328 const void *ptr)
329{
330 const struct mfc6_cache_cmp_arg *cmparg = arg->key;
331 struct mfc6_cache *c = (struct mfc6_cache *)ptr;
332
333 return !ipv6_addr_equal(&c->mf6c_mcastgrp, &cmparg->mf6c_mcastgrp) ||
334 !ipv6_addr_equal(&c->mf6c_origin, &cmparg->mf6c_origin);
335}
336
337static const struct rhashtable_params ip6mr_rht_params = {
338 .head_offset = offsetof(struct mr_mfc, mnode),
339 .key_offset = offsetof(struct mfc6_cache, cmparg),
340 .key_len = sizeof(struct mfc6_cache_cmp_arg),
341 .nelem_hint = 3,
342 .locks_mul = 1,
343 .obj_cmpfn = ip6mr_hash_cmp,
344 .automatic_shrinking = true,
345};
346
347static void ip6mr_new_table_set(struct mr_table *mrt,
348 struct net *net)
349{
350#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
351 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
352#endif
353}
354
355static struct mfc6_cache_cmp_arg ip6mr_mr_table_ops_cmparg_any = {
356 .mf6c_origin = IN6ADDR_ANY_INIT,
357 .mf6c_mcastgrp = IN6ADDR_ANY_INIT,
358};
359
360static struct mr_table_ops ip6mr_mr_table_ops = {
361 .rht_params = &ip6mr_rht_params,
362 .cmparg_any = &ip6mr_mr_table_ops_cmparg_any,
363};
364
365static struct mr_table *ip6mr_new_table(struct net *net, u32 id)
366{
367 struct mr_table *mrt;
368
369 mrt = ip6mr_get_table(net, id);
370 if (mrt)
371 return mrt;
372
373 return mr_table_alloc(net, id, &ip6mr_mr_table_ops,
374 ipmr_expire_process, ip6mr_new_table_set);
375}
376
377static void ip6mr_free_table(struct mr_table *mrt)
378{
379 del_timer_sync(&mrt->ipmr_expire_timer);
380 mroute_clean_tables(mrt, true);
381 rhltable_destroy(&mrt->mfc_hash);
382 kfree(mrt);
383}
384
385#ifdef CONFIG_PROC_FS
386/* The /proc interfaces to multicast routing
387 * /proc/ip6_mr_cache /proc/ip6_mr_vif
388 */
389
390static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
391 __acquires(mrt_lock)
392{
393 struct mr_vif_iter *iter = seq->private;
394 struct net *net = seq_file_net(seq);
395 struct mr_table *mrt;
396
397 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
398 if (!mrt)
399 return ERR_PTR(-ENOENT);
400
401 iter->mrt = mrt;
402
403 read_lock(&mrt_lock);
404 return mr_vif_seq_start(seq, pos);
405}
406
407static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
408 __releases(mrt_lock)
409{
410 read_unlock(&mrt_lock);
411}
412
413static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
414{
415 struct mr_vif_iter *iter = seq->private;
416 struct mr_table *mrt = iter->mrt;
417
418 if (v == SEQ_START_TOKEN) {
419 seq_puts(seq,
420 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
421 } else {
422 const struct vif_device *vif = v;
423 const char *name = vif->dev ? vif->dev->name : "none";
424
425 seq_printf(seq,
426 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
427 vif - mrt->vif_table,
428 name, vif->bytes_in, vif->pkt_in,
429 vif->bytes_out, vif->pkt_out,
430 vif->flags);
431 }
432 return 0;
433}
434
435static const struct seq_operations ip6mr_vif_seq_ops = {
436 .start = ip6mr_vif_seq_start,
437 .next = mr_vif_seq_next,
438 .stop = ip6mr_vif_seq_stop,
439 .show = ip6mr_vif_seq_show,
440};
441
442static int ip6mr_vif_open(struct inode *inode, struct file *file)
443{
444 return seq_open_net(inode, file, &ip6mr_vif_seq_ops,
445 sizeof(struct mr_vif_iter));
446}
447
448static const struct file_operations ip6mr_vif_fops = {
449 .open = ip6mr_vif_open,
450 .read = seq_read,
451 .llseek = seq_lseek,
452 .release = seq_release_net,
453};
454
455static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
456{
457 struct net *net = seq_file_net(seq);
458 struct mr_table *mrt;
459
460 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
461 if (!mrt)
462 return ERR_PTR(-ENOENT);
463
464 return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
465}
466
467static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
468{
469 int n;
470
471 if (v == SEQ_START_TOKEN) {
472 seq_puts(seq,
473 "Group "
474 "Origin "
475 "Iif Pkts Bytes Wrong Oifs\n");
476 } else {
477 const struct mfc6_cache *mfc = v;
478 const struct mr_mfc_iter *it = seq->private;
479 struct mr_table *mrt = it->mrt;
480
481 seq_printf(seq, "%pI6 %pI6 %-3hd",
482 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
483 mfc->_c.mfc_parent);
484
485 if (it->cache != &mrt->mfc_unres_queue) {
486 seq_printf(seq, " %8lu %8lu %8lu",
487 mfc->_c.mfc_un.res.pkt,
488 mfc->_c.mfc_un.res.bytes,
489 mfc->_c.mfc_un.res.wrong_if);
490 for (n = mfc->_c.mfc_un.res.minvif;
491 n < mfc->_c.mfc_un.res.maxvif; n++) {
492 if (VIF_EXISTS(mrt, n) &&
493 mfc->_c.mfc_un.res.ttls[n] < 255)
494 seq_printf(seq,
495 " %2d:%-3d", n,
496 mfc->_c.mfc_un.res.ttls[n]);
497 }
498 } else {
499 /* unresolved mfc_caches don't contain
500 * pkt, bytes and wrong_if values
501 */
502 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
503 }
504 seq_putc(seq, '\n');
505 }
506 return 0;
507}
508
509static const struct seq_operations ipmr_mfc_seq_ops = {
510 .start = ipmr_mfc_seq_start,
511 .next = mr_mfc_seq_next,
512 .stop = mr_mfc_seq_stop,
513 .show = ipmr_mfc_seq_show,
514};
515
516static int ipmr_mfc_open(struct inode *inode, struct file *file)
517{
518 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
519 sizeof(struct mr_mfc_iter));
520}
521
522static const struct file_operations ip6mr_mfc_fops = {
523 .open = ipmr_mfc_open,
524 .read = seq_read,
525 .llseek = seq_lseek,
526 .release = seq_release_net,
527};
528#endif
529
530#ifdef CONFIG_IPV6_PIMSM_V2
531
532static int pim6_rcv(struct sk_buff *skb)
533{
534 struct pimreghdr *pim;
535 struct ipv6hdr *encap;
536 struct net_device *reg_dev = NULL;
537 struct net *net = dev_net(skb->dev);
538 struct mr_table *mrt;
539 struct flowi6 fl6 = {
540 .flowi6_iif = skb->dev->ifindex,
541 .flowi6_mark = skb->mark,
542 };
543 int reg_vif_num;
544
545 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
546 goto drop;
547
548 pim = (struct pimreghdr *)skb_transport_header(skb);
549 if (pim->type != ((PIM_VERSION << 4) | PIM_TYPE_REGISTER) ||
550 (pim->flags & PIM_NULL_REGISTER) ||
551 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
552 sizeof(*pim), IPPROTO_PIM,
553 csum_partial((void *)pim, sizeof(*pim), 0)) &&
554 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
555 goto drop;
556
557 /* check if the inner packet is destined to mcast group */
558 encap = (struct ipv6hdr *)(skb_transport_header(skb) +
559 sizeof(*pim));
560
561 if (!ipv6_addr_is_multicast(&encap->daddr) ||
562 encap->payload_len == 0 ||
563 ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
564 goto drop;
565
566 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
567 goto drop;
568 reg_vif_num = mrt->mroute_reg_vif_num;
569
570 read_lock(&mrt_lock);
571 if (reg_vif_num >= 0)
572 reg_dev = mrt->vif_table[reg_vif_num].dev;
573 if (reg_dev)
574 dev_hold(reg_dev);
575 read_unlock(&mrt_lock);
576
577 if (!reg_dev)
578 goto drop;
579
580 skb->mac_header = skb->network_header;
581 skb_pull(skb, (u8 *)encap - skb->data);
582 skb_reset_network_header(skb);
583 skb->protocol = htons(ETH_P_IPV6);
584 skb->ip_summed = CHECKSUM_NONE;
585
586 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
587
588 netif_rx(skb);
589
590 dev_put(reg_dev);
591 return 0;
592 drop:
593 kfree_skb(skb);
594 return 0;
595}
596
597static const struct inet6_protocol pim6_protocol = {
598 .handler = pim6_rcv,
599};
600
601/* Service routines creating virtual interfaces: PIMREG */
602
603static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
604 struct net_device *dev)
605{
606 struct net *net = dev_net(dev);
607 struct mr_table *mrt;
608 struct flowi6 fl6 = {
609 .flowi6_oif = dev->ifindex,
610 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
611 .flowi6_mark = skb->mark,
612 };
613 int err;
614
615 err = ip6mr_fib_lookup(net, &fl6, &mrt);
616 if (err < 0) {
617 kfree_skb(skb);
618 return err;
619 }
620
621 read_lock(&mrt_lock);
622 dev->stats.tx_bytes += skb->len;
623 dev->stats.tx_packets++;
624 ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
625 read_unlock(&mrt_lock);
626 kfree_skb(skb);
627 return NETDEV_TX_OK;
628}
629
630static int reg_vif_get_iflink(const struct net_device *dev)
631{
632 return 0;
633}
634
635static const struct net_device_ops reg_vif_netdev_ops = {
636 .ndo_start_xmit = reg_vif_xmit,
637 .ndo_get_iflink = reg_vif_get_iflink,
638};
639
640static void reg_vif_setup(struct net_device *dev)
641{
642 dev->type = ARPHRD_PIMREG;
643 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
644 dev->flags = IFF_NOARP;
645 dev->netdev_ops = ®_vif_netdev_ops;
646 dev->needs_free_netdev = true;
647 dev->features |= NETIF_F_NETNS_LOCAL;
648}
649
650static struct net_device *ip6mr_reg_vif(struct net *net, struct mr_table *mrt)
651{
652 struct net_device *dev;
653 char name[IFNAMSIZ];
654
655 if (mrt->id == RT6_TABLE_DFLT)
656 sprintf(name, "pim6reg");
657 else
658 sprintf(name, "pim6reg%u", mrt->id);
659
660 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
661 if (!dev)
662 return NULL;
663
664 dev_net_set(dev, net);
665
666 if (register_netdevice(dev)) {
667 free_netdev(dev);
668 return NULL;
669 }
670
671 if (dev_open(dev))
672 goto failure;
673
674 dev_hold(dev);
675 return dev;
676
677failure:
678 unregister_netdevice(dev);
679 return NULL;
680}
681#endif
682
683static int call_ip6mr_vif_entry_notifiers(struct net *net,
684 enum fib_event_type event_type,
685 struct vif_device *vif,
686 mifi_t vif_index, u32 tb_id)
687{
688 return mr_call_vif_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
689 vif, vif_index, tb_id,
690 &net->ipv6.ipmr_seq);
691}
692
693static int call_ip6mr_mfc_entry_notifiers(struct net *net,
694 enum fib_event_type event_type,
695 struct mfc6_cache *mfc, u32 tb_id)
696{
697 return mr_call_mfc_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
698 &mfc->_c, tb_id, &net->ipv6.ipmr_seq);
699}
700
701/* Delete a VIF entry */
702static int mif6_delete(struct mr_table *mrt, int vifi, int notify,
703 struct list_head *head)
704{
705 struct vif_device *v;
706 struct net_device *dev;
707 struct inet6_dev *in6_dev;
708
709 if (vifi < 0 || vifi >= mrt->maxvif)
710 return -EADDRNOTAVAIL;
711
712 v = &mrt->vif_table[vifi];
713
714 if (VIF_EXISTS(mrt, vifi))
715 call_ip6mr_vif_entry_notifiers(read_pnet(&mrt->net),
716 FIB_EVENT_VIF_DEL, v, vifi,
717 mrt->id);
718
719 write_lock_bh(&mrt_lock);
720 dev = v->dev;
721 v->dev = NULL;
722
723 if (!dev) {
724 write_unlock_bh(&mrt_lock);
725 return -EADDRNOTAVAIL;
726 }
727
728#ifdef CONFIG_IPV6_PIMSM_V2
729 if (vifi == mrt->mroute_reg_vif_num)
730 mrt->mroute_reg_vif_num = -1;
731#endif
732
733 if (vifi + 1 == mrt->maxvif) {
734 int tmp;
735 for (tmp = vifi - 1; tmp >= 0; tmp--) {
736 if (VIF_EXISTS(mrt, tmp))
737 break;
738 }
739 mrt->maxvif = tmp + 1;
740 }
741
742 write_unlock_bh(&mrt_lock);
743
744 dev_set_allmulti(dev, -1);
745
746 in6_dev = __in6_dev_get(dev);
747 if (in6_dev) {
748 in6_dev->cnf.mc_forwarding--;
749 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
750 NETCONFA_MC_FORWARDING,
751 dev->ifindex, &in6_dev->cnf);
752 }
753
754 if ((v->flags & MIFF_REGISTER) && !notify)
755 unregister_netdevice_queue(dev, head);
756
757 dev_put(dev);
758 return 0;
759}
760
761static inline void ip6mr_cache_free_rcu(struct rcu_head *head)
762{
763 struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
764
765 kmem_cache_free(mrt_cachep, (struct mfc6_cache *)c);
766}
767
768static inline void ip6mr_cache_free(struct mfc6_cache *c)
769{
770 call_rcu(&c->_c.rcu, ip6mr_cache_free_rcu);
771}
772
773/* Destroy an unresolved cache entry, killing queued skbs
774 and reporting error to netlink readers.
775 */
776
777static void ip6mr_destroy_unres(struct mr_table *mrt, struct mfc6_cache *c)
778{
779 struct net *net = read_pnet(&mrt->net);
780 struct sk_buff *skb;
781
782 atomic_dec(&mrt->cache_resolve_queue_len);
783
784 while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved)) != NULL) {
785 if (ipv6_hdr(skb)->version == 0) {
786 struct nlmsghdr *nlh = skb_pull(skb,
787 sizeof(struct ipv6hdr));
788 nlh->nlmsg_type = NLMSG_ERROR;
789 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
790 skb_trim(skb, nlh->nlmsg_len);
791 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
792 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
793 } else
794 kfree_skb(skb);
795 }
796
797 ip6mr_cache_free(c);
798}
799
800
801/* Timer process for all the unresolved queue. */
802
803static void ipmr_do_expire_process(struct mr_table *mrt)
804{
805 unsigned long now = jiffies;
806 unsigned long expires = 10 * HZ;
807 struct mr_mfc *c, *next;
808
809 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
810 if (time_after(c->mfc_un.unres.expires, now)) {
811 /* not yet... */
812 unsigned long interval = c->mfc_un.unres.expires - now;
813 if (interval < expires)
814 expires = interval;
815 continue;
816 }
817
818 list_del(&c->list);
819 mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
820 ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
821 }
822
823 if (!list_empty(&mrt->mfc_unres_queue))
824 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
825}
826
827static void ipmr_expire_process(struct timer_list *t)
828{
829 struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
830
831 if (!spin_trylock(&mfc_unres_lock)) {
832 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
833 return;
834 }
835
836 if (!list_empty(&mrt->mfc_unres_queue))
837 ipmr_do_expire_process(mrt);
838
839 spin_unlock(&mfc_unres_lock);
840}
841
842/* Fill oifs list. It is called under write locked mrt_lock. */
843
844static void ip6mr_update_thresholds(struct mr_table *mrt,
845 struct mr_mfc *cache,
846 unsigned char *ttls)
847{
848 int vifi;
849
850 cache->mfc_un.res.minvif = MAXMIFS;
851 cache->mfc_un.res.maxvif = 0;
852 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
853
854 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
855 if (VIF_EXISTS(mrt, vifi) &&
856 ttls[vifi] && ttls[vifi] < 255) {
857 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
858 if (cache->mfc_un.res.minvif > vifi)
859 cache->mfc_un.res.minvif = vifi;
860 if (cache->mfc_un.res.maxvif <= vifi)
861 cache->mfc_un.res.maxvif = vifi + 1;
862 }
863 }
864 cache->mfc_un.res.lastuse = jiffies;
865}
866
867static int mif6_add(struct net *net, struct mr_table *mrt,
868 struct mif6ctl *vifc, int mrtsock)
869{
870 int vifi = vifc->mif6c_mifi;
871 struct vif_device *v = &mrt->vif_table[vifi];
872 struct net_device *dev;
873 struct inet6_dev *in6_dev;
874 int err;
875
876 /* Is vif busy ? */
877 if (VIF_EXISTS(mrt, vifi))
878 return -EADDRINUSE;
879
880 switch (vifc->mif6c_flags) {
881#ifdef CONFIG_IPV6_PIMSM_V2
882 case MIFF_REGISTER:
883 /*
884 * Special Purpose VIF in PIM
885 * All the packets will be sent to the daemon
886 */
887 if (mrt->mroute_reg_vif_num >= 0)
888 return -EADDRINUSE;
889 dev = ip6mr_reg_vif(net, mrt);
890 if (!dev)
891 return -ENOBUFS;
892 err = dev_set_allmulti(dev, 1);
893 if (err) {
894 unregister_netdevice(dev);
895 dev_put(dev);
896 return err;
897 }
898 break;
899#endif
900 case 0:
901 dev = dev_get_by_index(net, vifc->mif6c_pifi);
902 if (!dev)
903 return -EADDRNOTAVAIL;
904 err = dev_set_allmulti(dev, 1);
905 if (err) {
906 dev_put(dev);
907 return err;
908 }
909 break;
910 default:
911 return -EINVAL;
912 }
913
914 in6_dev = __in6_dev_get(dev);
915 if (in6_dev) {
916 in6_dev->cnf.mc_forwarding++;
917 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
918 NETCONFA_MC_FORWARDING,
919 dev->ifindex, &in6_dev->cnf);
920 }
921
922 /* Fill in the VIF structures */
923 vif_device_init(v, dev, vifc->vifc_rate_limit, vifc->vifc_threshold,
924 vifc->mif6c_flags | (!mrtsock ? VIFF_STATIC : 0),
925 MIFF_REGISTER);
926
927 /* And finish update writing critical data */
928 write_lock_bh(&mrt_lock);
929 v->dev = dev;
930#ifdef CONFIG_IPV6_PIMSM_V2
931 if (v->flags & MIFF_REGISTER)
932 mrt->mroute_reg_vif_num = vifi;
933#endif
934 if (vifi + 1 > mrt->maxvif)
935 mrt->maxvif = vifi + 1;
936 write_unlock_bh(&mrt_lock);
937 call_ip6mr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD,
938 v, vifi, mrt->id);
939 return 0;
940}
941
942static struct mfc6_cache *ip6mr_cache_find(struct mr_table *mrt,
943 const struct in6_addr *origin,
944 const struct in6_addr *mcastgrp)
945{
946 struct mfc6_cache_cmp_arg arg = {
947 .mf6c_origin = *origin,
948 .mf6c_mcastgrp = *mcastgrp,
949 };
950
951 return mr_mfc_find(mrt, &arg);
952}
953
954/* Look for a (*,G) entry */
955static struct mfc6_cache *ip6mr_cache_find_any(struct mr_table *mrt,
956 struct in6_addr *mcastgrp,
957 mifi_t mifi)
958{
959 struct mfc6_cache_cmp_arg arg = {
960 .mf6c_origin = in6addr_any,
961 .mf6c_mcastgrp = *mcastgrp,
962 };
963
964 if (ipv6_addr_any(mcastgrp))
965 return mr_mfc_find_any_parent(mrt, mifi);
966 return mr_mfc_find_any(mrt, mifi, &arg);
967}
968
969/* Look for a (S,G,iif) entry if parent != -1 */
970static struct mfc6_cache *
971ip6mr_cache_find_parent(struct mr_table *mrt,
972 const struct in6_addr *origin,
973 const struct in6_addr *mcastgrp,
974 int parent)
975{
976 struct mfc6_cache_cmp_arg arg = {
977 .mf6c_origin = *origin,
978 .mf6c_mcastgrp = *mcastgrp,
979 };
980
981 return mr_mfc_find_parent(mrt, &arg, parent);
982}
983
984/* Allocate a multicast cache entry */
985static struct mfc6_cache *ip6mr_cache_alloc(void)
986{
987 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
988 if (!c)
989 return NULL;
990 c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
991 c->_c.mfc_un.res.minvif = MAXMIFS;
992 c->_c.free = ip6mr_cache_free_rcu;
993 refcount_set(&c->_c.mfc_un.res.refcount, 1);
994 return c;
995}
996
997static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
998{
999 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
1000 if (!c)
1001 return NULL;
1002 skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
1003 c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
1004 return c;
1005}
1006
1007/*
1008 * A cache entry has gone into a resolved state from queued
1009 */
1010
1011static void ip6mr_cache_resolve(struct net *net, struct mr_table *mrt,
1012 struct mfc6_cache *uc, struct mfc6_cache *c)
1013{
1014 struct sk_buff *skb;
1015
1016 /*
1017 * Play the pending entries through our router
1018 */
1019
1020 while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
1021 if (ipv6_hdr(skb)->version == 0) {
1022 struct nlmsghdr *nlh = skb_pull(skb,
1023 sizeof(struct ipv6hdr));
1024
1025 if (mr_fill_mroute(mrt, skb, &c->_c,
1026 nlmsg_data(nlh)) > 0) {
1027 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1028 } else {
1029 nlh->nlmsg_type = NLMSG_ERROR;
1030 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1031 skb_trim(skb, nlh->nlmsg_len);
1032 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
1033 }
1034 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1035 } else
1036 ip6_mr_forward(net, mrt, skb, c);
1037 }
1038}
1039
1040/*
1041 * Bounce a cache query up to pim6sd and netlink.
1042 *
1043 * Called under mrt_lock.
1044 */
1045
1046static int ip6mr_cache_report(struct mr_table *mrt, struct sk_buff *pkt,
1047 mifi_t mifi, int assert)
1048{
1049 struct sock *mroute6_sk;
1050 struct sk_buff *skb;
1051 struct mrt6msg *msg;
1052 int ret;
1053
1054#ifdef CONFIG_IPV6_PIMSM_V2
1055 if (assert == MRT6MSG_WHOLEPKT)
1056 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1057 +sizeof(*msg));
1058 else
1059#endif
1060 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1061
1062 if (!skb)
1063 return -ENOBUFS;
1064
1065 /* I suppose that internal messages
1066 * do not require checksums */
1067
1068 skb->ip_summed = CHECKSUM_UNNECESSARY;
1069
1070#ifdef CONFIG_IPV6_PIMSM_V2
1071 if (assert == MRT6MSG_WHOLEPKT) {
1072 /* Ugly, but we have no choice with this interface.
1073 Duplicate old header, fix length etc.
1074 And all this only to mangle msg->im6_msgtype and
1075 to set msg->im6_mbz to "mbz" :-)
1076 */
1077 skb_push(skb, -skb_network_offset(pkt));
1078
1079 skb_push(skb, sizeof(*msg));
1080 skb_reset_transport_header(skb);
1081 msg = (struct mrt6msg *)skb_transport_header(skb);
1082 msg->im6_mbz = 0;
1083 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
1084 msg->im6_mif = mrt->mroute_reg_vif_num;
1085 msg->im6_pad = 0;
1086 msg->im6_src = ipv6_hdr(pkt)->saddr;
1087 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1088
1089 skb->ip_summed = CHECKSUM_UNNECESSARY;
1090 } else
1091#endif
1092 {
1093 /*
1094 * Copy the IP header
1095 */
1096
1097 skb_put(skb, sizeof(struct ipv6hdr));
1098 skb_reset_network_header(skb);
1099 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1100
1101 /*
1102 * Add our header
1103 */
1104 skb_put(skb, sizeof(*msg));
1105 skb_reset_transport_header(skb);
1106 msg = (struct mrt6msg *)skb_transport_header(skb);
1107
1108 msg->im6_mbz = 0;
1109 msg->im6_msgtype = assert;
1110 msg->im6_mif = mifi;
1111 msg->im6_pad = 0;
1112 msg->im6_src = ipv6_hdr(pkt)->saddr;
1113 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1114
1115 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1116 skb->ip_summed = CHECKSUM_UNNECESSARY;
1117 }
1118
1119 rcu_read_lock();
1120 mroute6_sk = rcu_dereference(mrt->mroute_sk);
1121 if (!mroute6_sk) {
1122 rcu_read_unlock();
1123 kfree_skb(skb);
1124 return -EINVAL;
1125 }
1126
1127 mrt6msg_netlink_event(mrt, skb);
1128
1129 /* Deliver to user space multicast routing algorithms */
1130 ret = sock_queue_rcv_skb(mroute6_sk, skb);
1131 rcu_read_unlock();
1132 if (ret < 0) {
1133 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
1134 kfree_skb(skb);
1135 }
1136
1137 return ret;
1138}
1139
1140/* Queue a packet for resolution. It gets locked cache entry! */
1141static int ip6mr_cache_unresolved(struct mr_table *mrt, mifi_t mifi,
1142 struct sk_buff *skb)
1143{
1144 struct mfc6_cache *c;
1145 bool found = false;
1146 int err;
1147
1148 spin_lock_bh(&mfc_unres_lock);
1149 list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
1150 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1151 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1152 found = true;
1153 break;
1154 }
1155 }
1156
1157 if (!found) {
1158 /*
1159 * Create a new entry if allowable
1160 */
1161
1162 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1163 (c = ip6mr_cache_alloc_unres()) == NULL) {
1164 spin_unlock_bh(&mfc_unres_lock);
1165
1166 kfree_skb(skb);
1167 return -ENOBUFS;
1168 }
1169
1170 /* Fill in the new cache entry */
1171 c->_c.mfc_parent = -1;
1172 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1173 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1174
1175 /*
1176 * Reflect first query at pim6sd
1177 */
1178 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1179 if (err < 0) {
1180 /* If the report failed throw the cache entry
1181 out - Brad Parker
1182 */
1183 spin_unlock_bh(&mfc_unres_lock);
1184
1185 ip6mr_cache_free(c);
1186 kfree_skb(skb);
1187 return err;
1188 }
1189
1190 atomic_inc(&mrt->cache_resolve_queue_len);
1191 list_add(&c->_c.list, &mrt->mfc_unres_queue);
1192 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1193
1194 ipmr_do_expire_process(mrt);
1195 }
1196
1197 /* See if we can append the packet */
1198 if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
1199 kfree_skb(skb);
1200 err = -ENOBUFS;
1201 } else {
1202 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
1203 err = 0;
1204 }
1205
1206 spin_unlock_bh(&mfc_unres_lock);
1207 return err;
1208}
1209
1210/*
1211 * MFC6 cache manipulation by user space
1212 */
1213
1214static int ip6mr_mfc_delete(struct mr_table *mrt, struct mf6cctl *mfc,
1215 int parent)
1216{
1217 struct mfc6_cache *c;
1218
1219 /* The entries are added/deleted only under RTNL */
1220 rcu_read_lock();
1221 c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr,
1222 &mfc->mf6cc_mcastgrp.sin6_addr, parent);
1223 rcu_read_unlock();
1224 if (!c)
1225 return -ENOENT;
1226 rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ip6mr_rht_params);
1227 list_del_rcu(&c->_c.list);
1228
1229 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
1230 FIB_EVENT_ENTRY_DEL, c, mrt->id);
1231 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1232 mr_cache_put(&c->_c);
1233 return 0;
1234}
1235
1236static int ip6mr_device_event(struct notifier_block *this,
1237 unsigned long event, void *ptr)
1238{
1239 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1240 struct net *net = dev_net(dev);
1241 struct mr_table *mrt;
1242 struct vif_device *v;
1243 int ct;
1244
1245 if (event != NETDEV_UNREGISTER)
1246 return NOTIFY_DONE;
1247
1248 ip6mr_for_each_table(mrt, net) {
1249 v = &mrt->vif_table[0];
1250 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1251 if (v->dev == dev)
1252 mif6_delete(mrt, ct, 1, NULL);
1253 }
1254 }
1255
1256 return NOTIFY_DONE;
1257}
1258
1259static unsigned int ip6mr_seq_read(struct net *net)
1260{
1261 ASSERT_RTNL();
1262
1263 return net->ipv6.ipmr_seq + ip6mr_rules_seq_read(net);
1264}
1265
1266static int ip6mr_dump(struct net *net, struct notifier_block *nb)
1267{
1268 return mr_dump(net, nb, RTNL_FAMILY_IP6MR, ip6mr_rules_dump,
1269 ip6mr_mr_table_iter, &mrt_lock);
1270}
1271
1272static struct notifier_block ip6_mr_notifier = {
1273 .notifier_call = ip6mr_device_event
1274};
1275
1276static const struct fib_notifier_ops ip6mr_notifier_ops_template = {
1277 .family = RTNL_FAMILY_IP6MR,
1278 .fib_seq_read = ip6mr_seq_read,
1279 .fib_dump = ip6mr_dump,
1280 .owner = THIS_MODULE,
1281};
1282
1283static int __net_init ip6mr_notifier_init(struct net *net)
1284{
1285 struct fib_notifier_ops *ops;
1286
1287 net->ipv6.ipmr_seq = 0;
1288
1289 ops = fib_notifier_ops_register(&ip6mr_notifier_ops_template, net);
1290 if (IS_ERR(ops))
1291 return PTR_ERR(ops);
1292
1293 net->ipv6.ip6mr_notifier_ops = ops;
1294
1295 return 0;
1296}
1297
1298static void __net_exit ip6mr_notifier_exit(struct net *net)
1299{
1300 fib_notifier_ops_unregister(net->ipv6.ip6mr_notifier_ops);
1301 net->ipv6.ip6mr_notifier_ops = NULL;
1302}
1303
1304/* Setup for IP multicast routing */
1305static int __net_init ip6mr_net_init(struct net *net)
1306{
1307 int err;
1308
1309 err = ip6mr_notifier_init(net);
1310 if (err)
1311 return err;
1312
1313 err = ip6mr_rules_init(net);
1314 if (err < 0)
1315 goto ip6mr_rules_fail;
1316
1317#ifdef CONFIG_PROC_FS
1318 err = -ENOMEM;
1319 if (!proc_create("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_fops))
1320 goto proc_vif_fail;
1321 if (!proc_create("ip6_mr_cache", 0, net->proc_net, &ip6mr_mfc_fops))
1322 goto proc_cache_fail;
1323#endif
1324
1325 return 0;
1326
1327#ifdef CONFIG_PROC_FS
1328proc_cache_fail:
1329 remove_proc_entry("ip6_mr_vif", net->proc_net);
1330proc_vif_fail:
1331 ip6mr_rules_exit(net);
1332#endif
1333ip6mr_rules_fail:
1334 ip6mr_notifier_exit(net);
1335 return err;
1336}
1337
1338static void __net_exit ip6mr_net_exit(struct net *net)
1339{
1340#ifdef CONFIG_PROC_FS
1341 remove_proc_entry("ip6_mr_cache", net->proc_net);
1342 remove_proc_entry("ip6_mr_vif", net->proc_net);
1343#endif
1344 ip6mr_rules_exit(net);
1345 ip6mr_notifier_exit(net);
1346}
1347
1348static struct pernet_operations ip6mr_net_ops = {
1349 .init = ip6mr_net_init,
1350 .exit = ip6mr_net_exit,
1351};
1352
1353int __init ip6_mr_init(void)
1354{
1355 int err;
1356
1357 mrt_cachep = kmem_cache_create("ip6_mrt_cache",
1358 sizeof(struct mfc6_cache),
1359 0, SLAB_HWCACHE_ALIGN,
1360 NULL);
1361 if (!mrt_cachep)
1362 return -ENOMEM;
1363
1364 err = register_pernet_subsys(&ip6mr_net_ops);
1365 if (err)
1366 goto reg_pernet_fail;
1367
1368 err = register_netdevice_notifier(&ip6_mr_notifier);
1369 if (err)
1370 goto reg_notif_fail;
1371#ifdef CONFIG_IPV6_PIMSM_V2
1372 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1373 pr_err("%s: can't add PIM protocol\n", __func__);
1374 err = -EAGAIN;
1375 goto add_proto_fail;
1376 }
1377#endif
1378 err = rtnl_register_module(THIS_MODULE, RTNL_FAMILY_IP6MR, RTM_GETROUTE,
1379 NULL, ip6mr_rtm_dumproute, 0);
1380 if (err == 0)
1381 return 0;
1382
1383#ifdef CONFIG_IPV6_PIMSM_V2
1384 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
1385add_proto_fail:
1386 unregister_netdevice_notifier(&ip6_mr_notifier);
1387#endif
1388reg_notif_fail:
1389 unregister_pernet_subsys(&ip6mr_net_ops);
1390reg_pernet_fail:
1391 kmem_cache_destroy(mrt_cachep);
1392 return err;
1393}
1394
1395void ip6_mr_cleanup(void)
1396{
1397 rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE);
1398#ifdef CONFIG_IPV6_PIMSM_V2
1399 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
1400#endif
1401 unregister_netdevice_notifier(&ip6_mr_notifier);
1402 unregister_pernet_subsys(&ip6mr_net_ops);
1403 kmem_cache_destroy(mrt_cachep);
1404}
1405
1406static int ip6mr_mfc_add(struct net *net, struct mr_table *mrt,
1407 struct mf6cctl *mfc, int mrtsock, int parent)
1408{
1409 unsigned char ttls[MAXMIFS];
1410 struct mfc6_cache *uc, *c;
1411 struct mr_mfc *_uc;
1412 bool found;
1413 int i, err;
1414
1415 if (mfc->mf6cc_parent >= MAXMIFS)
1416 return -ENFILE;
1417
1418 memset(ttls, 255, MAXMIFS);
1419 for (i = 0; i < MAXMIFS; i++) {
1420 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1421 ttls[i] = 1;
1422 }
1423
1424 /* The entries are added/deleted only under RTNL */
1425 rcu_read_lock();
1426 c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr,
1427 &mfc->mf6cc_mcastgrp.sin6_addr, parent);
1428 rcu_read_unlock();
1429 if (c) {
1430 write_lock_bh(&mrt_lock);
1431 c->_c.mfc_parent = mfc->mf6cc_parent;
1432 ip6mr_update_thresholds(mrt, &c->_c, ttls);
1433 if (!mrtsock)
1434 c->_c.mfc_flags |= MFC_STATIC;
1435 write_unlock_bh(&mrt_lock);
1436 call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE,
1437 c, mrt->id);
1438 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1439 return 0;
1440 }
1441
1442 if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
1443 !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1444 return -EINVAL;
1445
1446 c = ip6mr_cache_alloc();
1447 if (!c)
1448 return -ENOMEM;
1449
1450 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1451 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1452 c->_c.mfc_parent = mfc->mf6cc_parent;
1453 ip6mr_update_thresholds(mrt, &c->_c, ttls);
1454 if (!mrtsock)
1455 c->_c.mfc_flags |= MFC_STATIC;
1456
1457 err = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
1458 ip6mr_rht_params);
1459 if (err) {
1460 pr_err("ip6mr: rhtable insert error %d\n", err);
1461 ip6mr_cache_free(c);
1462 return err;
1463 }
1464 list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
1465
1466 /* Check to see if we resolved a queued list. If so we
1467 * need to send on the frames and tidy up.
1468 */
1469 found = false;
1470 spin_lock_bh(&mfc_unres_lock);
1471 list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
1472 uc = (struct mfc6_cache *)_uc;
1473 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1474 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1475 list_del(&_uc->list);
1476 atomic_dec(&mrt->cache_resolve_queue_len);
1477 found = true;
1478 break;
1479 }
1480 }
1481 if (list_empty(&mrt->mfc_unres_queue))
1482 del_timer(&mrt->ipmr_expire_timer);
1483 spin_unlock_bh(&mfc_unres_lock);
1484
1485 if (found) {
1486 ip6mr_cache_resolve(net, mrt, uc, c);
1487 ip6mr_cache_free(uc);
1488 }
1489 call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD,
1490 c, mrt->id);
1491 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1492 return 0;
1493}
1494
1495/*
1496 * Close the multicast socket, and clear the vif tables etc
1497 */
1498
1499static void mroute_clean_tables(struct mr_table *mrt, bool all)
1500{
1501 struct mr_mfc *c, *tmp;
1502 LIST_HEAD(list);
1503 int i;
1504
1505 /* Shut down all active vif entries */
1506 for (i = 0; i < mrt->maxvif; i++) {
1507 if (!all && (mrt->vif_table[i].flags & VIFF_STATIC))
1508 continue;
1509 mif6_delete(mrt, i, 0, &list);
1510 }
1511 unregister_netdevice_many(&list);
1512
1513 /* Wipe the cache */
1514 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
1515 if (!all && (c->mfc_flags & MFC_STATIC))
1516 continue;
1517 rhltable_remove(&mrt->mfc_hash, &c->mnode, ip6mr_rht_params);
1518 list_del_rcu(&c->list);
1519 mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
1520 mr_cache_put(c);
1521 }
1522
1523 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1524 spin_lock_bh(&mfc_unres_lock);
1525 list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
1526 list_del(&c->list);
1527 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
1528 FIB_EVENT_ENTRY_DEL,
1529 (struct mfc6_cache *)c,
1530 mrt->id);
1531 mr6_netlink_event(mrt, (struct mfc6_cache *)c,
1532 RTM_DELROUTE);
1533 ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
1534 }
1535 spin_unlock_bh(&mfc_unres_lock);
1536 }
1537}
1538
1539static int ip6mr_sk_init(struct mr_table *mrt, struct sock *sk)
1540{
1541 int err = 0;
1542 struct net *net = sock_net(sk);
1543
1544 rtnl_lock();
1545 write_lock_bh(&mrt_lock);
1546 if (rtnl_dereference(mrt->mroute_sk)) {
1547 err = -EADDRINUSE;
1548 } else {
1549 rcu_assign_pointer(mrt->mroute_sk, sk);
1550 sock_set_flag(sk, SOCK_RCU_FREE);
1551 net->ipv6.devconf_all->mc_forwarding++;
1552 }
1553 write_unlock_bh(&mrt_lock);
1554
1555 if (!err)
1556 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
1557 NETCONFA_MC_FORWARDING,
1558 NETCONFA_IFINDEX_ALL,
1559 net->ipv6.devconf_all);
1560 rtnl_unlock();
1561
1562 return err;
1563}
1564
1565int ip6mr_sk_done(struct sock *sk)
1566{
1567 int err = -EACCES;
1568 struct net *net = sock_net(sk);
1569 struct mr_table *mrt;
1570
1571 if (sk->sk_type != SOCK_RAW ||
1572 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1573 return err;
1574
1575 rtnl_lock();
1576 ip6mr_for_each_table(mrt, net) {
1577 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1578 write_lock_bh(&mrt_lock);
1579 RCU_INIT_POINTER(mrt->mroute_sk, NULL);
1580 /* Note that mroute_sk had SOCK_RCU_FREE set,
1581 * so the RCU grace period before sk freeing
1582 * is guaranteed by sk_destruct()
1583 */
1584 net->ipv6.devconf_all->mc_forwarding--;
1585 write_unlock_bh(&mrt_lock);
1586 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
1587 NETCONFA_MC_FORWARDING,
1588 NETCONFA_IFINDEX_ALL,
1589 net->ipv6.devconf_all);
1590
1591 mroute_clean_tables(mrt, false);
1592 err = 0;
1593 break;
1594 }
1595 }
1596 rtnl_unlock();
1597
1598 return err;
1599}
1600
1601bool mroute6_is_socket(struct net *net, struct sk_buff *skb)
1602{
1603 struct mr_table *mrt;
1604 struct flowi6 fl6 = {
1605 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
1606 .flowi6_oif = skb->dev->ifindex,
1607 .flowi6_mark = skb->mark,
1608 };
1609
1610 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1611 return NULL;
1612
1613 return rcu_access_pointer(mrt->mroute_sk);
1614}
1615EXPORT_SYMBOL(mroute6_is_socket);
1616
1617/*
1618 * Socket options and virtual interface manipulation. The whole
1619 * virtual interface system is a complete heap, but unfortunately
1620 * that's how BSD mrouted happens to think. Maybe one day with a proper
1621 * MOSPF/PIM router set up we can clean this up.
1622 */
1623
1624int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1625{
1626 int ret, parent = 0;
1627 struct mif6ctl vif;
1628 struct mf6cctl mfc;
1629 mifi_t mifi;
1630 struct net *net = sock_net(sk);
1631 struct mr_table *mrt;
1632
1633 if (sk->sk_type != SOCK_RAW ||
1634 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1635 return -EOPNOTSUPP;
1636
1637 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1638 if (!mrt)
1639 return -ENOENT;
1640
1641 if (optname != MRT6_INIT) {
1642 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
1643 !ns_capable(net->user_ns, CAP_NET_ADMIN))
1644 return -EACCES;
1645 }
1646
1647 switch (optname) {
1648 case MRT6_INIT:
1649 if (optlen < sizeof(int))
1650 return -EINVAL;
1651
1652 return ip6mr_sk_init(mrt, sk);
1653
1654 case MRT6_DONE:
1655 return ip6mr_sk_done(sk);
1656
1657 case MRT6_ADD_MIF:
1658 if (optlen < sizeof(vif))
1659 return -EINVAL;
1660 if (copy_from_user(&vif, optval, sizeof(vif)))
1661 return -EFAULT;
1662 if (vif.mif6c_mifi >= MAXMIFS)
1663 return -ENFILE;
1664 rtnl_lock();
1665 ret = mif6_add(net, mrt, &vif,
1666 sk == rtnl_dereference(mrt->mroute_sk));
1667 rtnl_unlock();
1668 return ret;
1669
1670 case MRT6_DEL_MIF:
1671 if (optlen < sizeof(mifi_t))
1672 return -EINVAL;
1673 if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
1674 return -EFAULT;
1675 rtnl_lock();
1676 ret = mif6_delete(mrt, mifi, 0, NULL);
1677 rtnl_unlock();
1678 return ret;
1679
1680 /*
1681 * Manipulate the forwarding caches. These live
1682 * in a sort of kernel/user symbiosis.
1683 */
1684 case MRT6_ADD_MFC:
1685 case MRT6_DEL_MFC:
1686 parent = -1;
1687 /* fall through */
1688 case MRT6_ADD_MFC_PROXY:
1689 case MRT6_DEL_MFC_PROXY:
1690 if (optlen < sizeof(mfc))
1691 return -EINVAL;
1692 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1693 return -EFAULT;
1694 if (parent == 0)
1695 parent = mfc.mf6cc_parent;
1696 rtnl_lock();
1697 if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
1698 ret = ip6mr_mfc_delete(mrt, &mfc, parent);
1699 else
1700 ret = ip6mr_mfc_add(net, mrt, &mfc,
1701 sk ==
1702 rtnl_dereference(mrt->mroute_sk),
1703 parent);
1704 rtnl_unlock();
1705 return ret;
1706
1707 /*
1708 * Control PIM assert (to activate pim will activate assert)
1709 */
1710 case MRT6_ASSERT:
1711 {
1712 int v;
1713
1714 if (optlen != sizeof(v))
1715 return -EINVAL;
1716 if (get_user(v, (int __user *)optval))
1717 return -EFAULT;
1718 mrt->mroute_do_assert = v;
1719 return 0;
1720 }
1721
1722#ifdef CONFIG_IPV6_PIMSM_V2
1723 case MRT6_PIM:
1724 {
1725 int v;
1726
1727 if (optlen != sizeof(v))
1728 return -EINVAL;
1729 if (get_user(v, (int __user *)optval))
1730 return -EFAULT;
1731 v = !!v;
1732 rtnl_lock();
1733 ret = 0;
1734 if (v != mrt->mroute_do_pim) {
1735 mrt->mroute_do_pim = v;
1736 mrt->mroute_do_assert = v;
1737 }
1738 rtnl_unlock();
1739 return ret;
1740 }
1741
1742#endif
1743#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1744 case MRT6_TABLE:
1745 {
1746 u32 v;
1747
1748 if (optlen != sizeof(u32))
1749 return -EINVAL;
1750 if (get_user(v, (u32 __user *)optval))
1751 return -EFAULT;
1752 /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
1753 if (v != RT_TABLE_DEFAULT && v >= 100000000)
1754 return -EINVAL;
1755 if (sk == rcu_access_pointer(mrt->mroute_sk))
1756 return -EBUSY;
1757
1758 rtnl_lock();
1759 ret = 0;
1760 if (!ip6mr_new_table(net, v))
1761 ret = -ENOMEM;
1762 raw6_sk(sk)->ip6mr_table = v;
1763 rtnl_unlock();
1764 return ret;
1765 }
1766#endif
1767 /*
1768 * Spurious command, or MRT6_VERSION which you cannot
1769 * set.
1770 */
1771 default:
1772 return -ENOPROTOOPT;
1773 }
1774}
1775
1776/*
1777 * Getsock opt support for the multicast routing system.
1778 */
1779
1780int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1781 int __user *optlen)
1782{
1783 int olr;
1784 int val;
1785 struct net *net = sock_net(sk);
1786 struct mr_table *mrt;
1787
1788 if (sk->sk_type != SOCK_RAW ||
1789 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1790 return -EOPNOTSUPP;
1791
1792 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1793 if (!mrt)
1794 return -ENOENT;
1795
1796 switch (optname) {
1797 case MRT6_VERSION:
1798 val = 0x0305;
1799 break;
1800#ifdef CONFIG_IPV6_PIMSM_V2
1801 case MRT6_PIM:
1802 val = mrt->mroute_do_pim;
1803 break;
1804#endif
1805 case MRT6_ASSERT:
1806 val = mrt->mroute_do_assert;
1807 break;
1808 default:
1809 return -ENOPROTOOPT;
1810 }
1811
1812 if (get_user(olr, optlen))
1813 return -EFAULT;
1814
1815 olr = min_t(int, olr, sizeof(int));
1816 if (olr < 0)
1817 return -EINVAL;
1818
1819 if (put_user(olr, optlen))
1820 return -EFAULT;
1821 if (copy_to_user(optval, &val, olr))
1822 return -EFAULT;
1823 return 0;
1824}
1825
1826/*
1827 * The IP multicast ioctl support routines.
1828 */
1829
1830int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1831{
1832 struct sioc_sg_req6 sr;
1833 struct sioc_mif_req6 vr;
1834 struct vif_device *vif;
1835 struct mfc6_cache *c;
1836 struct net *net = sock_net(sk);
1837 struct mr_table *mrt;
1838
1839 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1840 if (!mrt)
1841 return -ENOENT;
1842
1843 switch (cmd) {
1844 case SIOCGETMIFCNT_IN6:
1845 if (copy_from_user(&vr, arg, sizeof(vr)))
1846 return -EFAULT;
1847 if (vr.mifi >= mrt->maxvif)
1848 return -EINVAL;
1849 read_lock(&mrt_lock);
1850 vif = &mrt->vif_table[vr.mifi];
1851 if (VIF_EXISTS(mrt, vr.mifi)) {
1852 vr.icount = vif->pkt_in;
1853 vr.ocount = vif->pkt_out;
1854 vr.ibytes = vif->bytes_in;
1855 vr.obytes = vif->bytes_out;
1856 read_unlock(&mrt_lock);
1857
1858 if (copy_to_user(arg, &vr, sizeof(vr)))
1859 return -EFAULT;
1860 return 0;
1861 }
1862 read_unlock(&mrt_lock);
1863 return -EADDRNOTAVAIL;
1864 case SIOCGETSGCNT_IN6:
1865 if (copy_from_user(&sr, arg, sizeof(sr)))
1866 return -EFAULT;
1867
1868 rcu_read_lock();
1869 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1870 if (c) {
1871 sr.pktcnt = c->_c.mfc_un.res.pkt;
1872 sr.bytecnt = c->_c.mfc_un.res.bytes;
1873 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1874 rcu_read_unlock();
1875
1876 if (copy_to_user(arg, &sr, sizeof(sr)))
1877 return -EFAULT;
1878 return 0;
1879 }
1880 rcu_read_unlock();
1881 return -EADDRNOTAVAIL;
1882 default:
1883 return -ENOIOCTLCMD;
1884 }
1885}
1886
1887#ifdef CONFIG_COMPAT
1888struct compat_sioc_sg_req6 {
1889 struct sockaddr_in6 src;
1890 struct sockaddr_in6 grp;
1891 compat_ulong_t pktcnt;
1892 compat_ulong_t bytecnt;
1893 compat_ulong_t wrong_if;
1894};
1895
1896struct compat_sioc_mif_req6 {
1897 mifi_t mifi;
1898 compat_ulong_t icount;
1899 compat_ulong_t ocount;
1900 compat_ulong_t ibytes;
1901 compat_ulong_t obytes;
1902};
1903
1904int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1905{
1906 struct compat_sioc_sg_req6 sr;
1907 struct compat_sioc_mif_req6 vr;
1908 struct vif_device *vif;
1909 struct mfc6_cache *c;
1910 struct net *net = sock_net(sk);
1911 struct mr_table *mrt;
1912
1913 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1914 if (!mrt)
1915 return -ENOENT;
1916
1917 switch (cmd) {
1918 case SIOCGETMIFCNT_IN6:
1919 if (copy_from_user(&vr, arg, sizeof(vr)))
1920 return -EFAULT;
1921 if (vr.mifi >= mrt->maxvif)
1922 return -EINVAL;
1923 read_lock(&mrt_lock);
1924 vif = &mrt->vif_table[vr.mifi];
1925 if (VIF_EXISTS(mrt, vr.mifi)) {
1926 vr.icount = vif->pkt_in;
1927 vr.ocount = vif->pkt_out;
1928 vr.ibytes = vif->bytes_in;
1929 vr.obytes = vif->bytes_out;
1930 read_unlock(&mrt_lock);
1931
1932 if (copy_to_user(arg, &vr, sizeof(vr)))
1933 return -EFAULT;
1934 return 0;
1935 }
1936 read_unlock(&mrt_lock);
1937 return -EADDRNOTAVAIL;
1938 case SIOCGETSGCNT_IN6:
1939 if (copy_from_user(&sr, arg, sizeof(sr)))
1940 return -EFAULT;
1941
1942 rcu_read_lock();
1943 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1944 if (c) {
1945 sr.pktcnt = c->_c.mfc_un.res.pkt;
1946 sr.bytecnt = c->_c.mfc_un.res.bytes;
1947 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1948 rcu_read_unlock();
1949
1950 if (copy_to_user(arg, &sr, sizeof(sr)))
1951 return -EFAULT;
1952 return 0;
1953 }
1954 rcu_read_unlock();
1955 return -EADDRNOTAVAIL;
1956 default:
1957 return -ENOIOCTLCMD;
1958 }
1959}
1960#endif
1961
1962static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
1963{
1964 __IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
1965 IPSTATS_MIB_OUTFORWDATAGRAMS);
1966 __IP6_ADD_STATS(net, ip6_dst_idev(skb_dst(skb)),
1967 IPSTATS_MIB_OUTOCTETS, skb->len);
1968 return dst_output(net, sk, skb);
1969}
1970
1971/*
1972 * Processing handlers for ip6mr_forward
1973 */
1974
1975static int ip6mr_forward2(struct net *net, struct mr_table *mrt,
1976 struct sk_buff *skb, struct mfc6_cache *c, int vifi)
1977{
1978 struct ipv6hdr *ipv6h;
1979 struct vif_device *vif = &mrt->vif_table[vifi];
1980 struct net_device *dev;
1981 struct dst_entry *dst;
1982 struct flowi6 fl6;
1983
1984 if (!vif->dev)
1985 goto out_free;
1986
1987#ifdef CONFIG_IPV6_PIMSM_V2
1988 if (vif->flags & MIFF_REGISTER) {
1989 vif->pkt_out++;
1990 vif->bytes_out += skb->len;
1991 vif->dev->stats.tx_bytes += skb->len;
1992 vif->dev->stats.tx_packets++;
1993 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
1994 goto out_free;
1995 }
1996#endif
1997
1998 ipv6h = ipv6_hdr(skb);
1999
2000 fl6 = (struct flowi6) {
2001 .flowi6_oif = vif->link,
2002 .daddr = ipv6h->daddr,
2003 };
2004
2005 dst = ip6_route_output(net, NULL, &fl6);
2006 if (dst->error) {
2007 dst_release(dst);
2008 goto out_free;
2009 }
2010
2011 skb_dst_drop(skb);
2012 skb_dst_set(skb, dst);
2013
2014 /*
2015 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
2016 * not only before forwarding, but after forwarding on all output
2017 * interfaces. It is clear, if mrouter runs a multicasting
2018 * program, it should receive packets not depending to what interface
2019 * program is joined.
2020 * If we will not make it, the program will have to join on all
2021 * interfaces. On the other hand, multihoming host (or router, but
2022 * not mrouter) cannot join to more than one interface - it will
2023 * result in receiving multiple packets.
2024 */
2025 dev = vif->dev;
2026 skb->dev = dev;
2027 vif->pkt_out++;
2028 vif->bytes_out += skb->len;
2029
2030 /* We are about to write */
2031 /* XXX: extension headers? */
2032 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
2033 goto out_free;
2034
2035 ipv6h = ipv6_hdr(skb);
2036 ipv6h->hop_limit--;
2037
2038 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
2039
2040 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
2041 net, NULL, skb, skb->dev, dev,
2042 ip6mr_forward2_finish);
2043
2044out_free:
2045 kfree_skb(skb);
2046 return 0;
2047}
2048
2049static int ip6mr_find_vif(struct mr_table *mrt, struct net_device *dev)
2050{
2051 int ct;
2052
2053 for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
2054 if (mrt->vif_table[ct].dev == dev)
2055 break;
2056 }
2057 return ct;
2058}
2059
2060static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
2061 struct sk_buff *skb, struct mfc6_cache *c)
2062{
2063 int psend = -1;
2064 int vif, ct;
2065 int true_vifi = ip6mr_find_vif(mrt, skb->dev);
2066
2067 vif = c->_c.mfc_parent;
2068 c->_c.mfc_un.res.pkt++;
2069 c->_c.mfc_un.res.bytes += skb->len;
2070 c->_c.mfc_un.res.lastuse = jiffies;
2071
2072 if (ipv6_addr_any(&c->mf6c_origin) && true_vifi >= 0) {
2073 struct mfc6_cache *cache_proxy;
2074
2075 /* For an (*,G) entry, we only check that the incoming
2076 * interface is part of the static tree.
2077 */
2078 rcu_read_lock();
2079 cache_proxy = mr_mfc_find_any_parent(mrt, vif);
2080 if (cache_proxy &&
2081 cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255) {
2082 rcu_read_unlock();
2083 goto forward;
2084 }
2085 rcu_read_unlock();
2086 }
2087
2088 /*
2089 * Wrong interface: drop packet and (maybe) send PIM assert.
2090 */
2091 if (mrt->vif_table[vif].dev != skb->dev) {
2092 c->_c.mfc_un.res.wrong_if++;
2093
2094 if (true_vifi >= 0 && mrt->mroute_do_assert &&
2095 /* pimsm uses asserts, when switching from RPT to SPT,
2096 so that we cannot check that packet arrived on an oif.
2097 It is bad, but otherwise we would need to move pretty
2098 large chunk of pimd to kernel. Ough... --ANK
2099 */
2100 (mrt->mroute_do_pim ||
2101 c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
2102 time_after(jiffies,
2103 c->_c.mfc_un.res.last_assert +
2104 MFC_ASSERT_THRESH)) {
2105 c->_c.mfc_un.res.last_assert = jiffies;
2106 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2107 }
2108 goto dont_forward;
2109 }
2110
2111forward:
2112 mrt->vif_table[vif].pkt_in++;
2113 mrt->vif_table[vif].bytes_in += skb->len;
2114
2115 /*
2116 * Forward the frame
2117 */
2118 if (ipv6_addr_any(&c->mf6c_origin) &&
2119 ipv6_addr_any(&c->mf6c_mcastgrp)) {
2120 if (true_vifi >= 0 &&
2121 true_vifi != c->_c.mfc_parent &&
2122 ipv6_hdr(skb)->hop_limit >
2123 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
2124 /* It's an (*,*) entry and the packet is not coming from
2125 * the upstream: forward the packet to the upstream
2126 * only.
2127 */
2128 psend = c->_c.mfc_parent;
2129 goto last_forward;
2130 }
2131 goto dont_forward;
2132 }
2133 for (ct = c->_c.mfc_un.res.maxvif - 1;
2134 ct >= c->_c.mfc_un.res.minvif; ct--) {
2135 /* For (*,G) entry, don't forward to the incoming interface */
2136 if ((!ipv6_addr_any(&c->mf6c_origin) || ct != true_vifi) &&
2137 ipv6_hdr(skb)->hop_limit > c->_c.mfc_un.res.ttls[ct]) {
2138 if (psend != -1) {
2139 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2140 if (skb2)
2141 ip6mr_forward2(net, mrt, skb2,
2142 c, psend);
2143 }
2144 psend = ct;
2145 }
2146 }
2147last_forward:
2148 if (psend != -1) {
2149 ip6mr_forward2(net, mrt, skb, c, psend);
2150 return;
2151 }
2152
2153dont_forward:
2154 kfree_skb(skb);
2155}
2156
2157
2158/*
2159 * Multicast packets for forwarding arrive here
2160 */
2161
2162int ip6_mr_input(struct sk_buff *skb)
2163{
2164 struct mfc6_cache *cache;
2165 struct net *net = dev_net(skb->dev);
2166 struct mr_table *mrt;
2167 struct flowi6 fl6 = {
2168 .flowi6_iif = skb->dev->ifindex,
2169 .flowi6_mark = skb->mark,
2170 };
2171 int err;
2172
2173 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2174 if (err < 0) {
2175 kfree_skb(skb);
2176 return err;
2177 }
2178
2179 read_lock(&mrt_lock);
2180 cache = ip6mr_cache_find(mrt,
2181 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2182 if (!cache) {
2183 int vif = ip6mr_find_vif(mrt, skb->dev);
2184
2185 if (vif >= 0)
2186 cache = ip6mr_cache_find_any(mrt,
2187 &ipv6_hdr(skb)->daddr,
2188 vif);
2189 }
2190
2191 /*
2192 * No usable cache entry
2193 */
2194 if (!cache) {
2195 int vif;
2196
2197 vif = ip6mr_find_vif(mrt, skb->dev);
2198 if (vif >= 0) {
2199 int err = ip6mr_cache_unresolved(mrt, vif, skb);
2200 read_unlock(&mrt_lock);
2201
2202 return err;
2203 }
2204 read_unlock(&mrt_lock);
2205 kfree_skb(skb);
2206 return -ENODEV;
2207 }
2208
2209 ip6_mr_forward(net, mrt, skb, cache);
2210
2211 read_unlock(&mrt_lock);
2212
2213 return 0;
2214}
2215
2216int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm,
2217 u32 portid)
2218{
2219 int err;
2220 struct mr_table *mrt;
2221 struct mfc6_cache *cache;
2222 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
2223
2224 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2225 if (!mrt)
2226 return -ENOENT;
2227
2228 read_lock(&mrt_lock);
2229 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2230 if (!cache && skb->dev) {
2231 int vif = ip6mr_find_vif(mrt, skb->dev);
2232
2233 if (vif >= 0)
2234 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
2235 vif);
2236 }
2237
2238 if (!cache) {
2239 struct sk_buff *skb2;
2240 struct ipv6hdr *iph;
2241 struct net_device *dev;
2242 int vif;
2243
2244 dev = skb->dev;
2245 if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2246 read_unlock(&mrt_lock);
2247 return -ENODEV;
2248 }
2249
2250 /* really correct? */
2251 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2252 if (!skb2) {
2253 read_unlock(&mrt_lock);
2254 return -ENOMEM;
2255 }
2256
2257 NETLINK_CB(skb2).portid = portid;
2258 skb_reset_transport_header(skb2);
2259
2260 skb_put(skb2, sizeof(struct ipv6hdr));
2261 skb_reset_network_header(skb2);
2262
2263 iph = ipv6_hdr(skb2);
2264 iph->version = 0;
2265 iph->priority = 0;
2266 iph->flow_lbl[0] = 0;
2267 iph->flow_lbl[1] = 0;
2268 iph->flow_lbl[2] = 0;
2269 iph->payload_len = 0;
2270 iph->nexthdr = IPPROTO_NONE;
2271 iph->hop_limit = 0;
2272 iph->saddr = rt->rt6i_src.addr;
2273 iph->daddr = rt->rt6i_dst.addr;
2274
2275 err = ip6mr_cache_unresolved(mrt, vif, skb2);
2276 read_unlock(&mrt_lock);
2277
2278 return err;
2279 }
2280
2281 err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
2282 read_unlock(&mrt_lock);
2283 return err;
2284}
2285
2286static int ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2287 u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
2288 int flags)
2289{
2290 struct nlmsghdr *nlh;
2291 struct rtmsg *rtm;
2292 int err;
2293
2294 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2295 if (!nlh)
2296 return -EMSGSIZE;
2297
2298 rtm = nlmsg_data(nlh);
2299 rtm->rtm_family = RTNL_FAMILY_IP6MR;
2300 rtm->rtm_dst_len = 128;
2301 rtm->rtm_src_len = 128;
2302 rtm->rtm_tos = 0;
2303 rtm->rtm_table = mrt->id;
2304 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2305 goto nla_put_failure;
2306 rtm->rtm_type = RTN_MULTICAST;
2307 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2308 if (c->_c.mfc_flags & MFC_STATIC)
2309 rtm->rtm_protocol = RTPROT_STATIC;
2310 else
2311 rtm->rtm_protocol = RTPROT_MROUTED;
2312 rtm->rtm_flags = 0;
2313
2314 if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) ||
2315 nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp))
2316 goto nla_put_failure;
2317 err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
2318 /* do not break the dump if cache is unresolved */
2319 if (err < 0 && err != -ENOENT)
2320 goto nla_put_failure;
2321
2322 nlmsg_end(skb, nlh);
2323 return 0;
2324
2325nla_put_failure:
2326 nlmsg_cancel(skb, nlh);
2327 return -EMSGSIZE;
2328}
2329
2330static int _ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2331 u32 portid, u32 seq, struct mr_mfc *c,
2332 int cmd, int flags)
2333{
2334 return ip6mr_fill_mroute(mrt, skb, portid, seq, (struct mfc6_cache *)c,
2335 cmd, flags);
2336}
2337
2338static int mr6_msgsize(bool unresolved, int maxvif)
2339{
2340 size_t len =
2341 NLMSG_ALIGN(sizeof(struct rtmsg))
2342 + nla_total_size(4) /* RTA_TABLE */
2343 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
2344 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
2345 ;
2346
2347 if (!unresolved)
2348 len = len
2349 + nla_total_size(4) /* RTA_IIF */
2350 + nla_total_size(0) /* RTA_MULTIPATH */
2351 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2352 /* RTA_MFC_STATS */
2353 + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
2354 ;
2355
2356 return len;
2357}
2358
2359static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
2360 int cmd)
2361{
2362 struct net *net = read_pnet(&mrt->net);
2363 struct sk_buff *skb;
2364 int err = -ENOBUFS;
2365
2366 skb = nlmsg_new(mr6_msgsize(mfc->_c.mfc_parent >= MAXMIFS, mrt->maxvif),
2367 GFP_ATOMIC);
2368 if (!skb)
2369 goto errout;
2370
2371 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2372 if (err < 0)
2373 goto errout;
2374
2375 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
2376 return;
2377
2378errout:
2379 kfree_skb(skb);
2380 if (err < 0)
2381 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
2382}
2383
2384static size_t mrt6msg_netlink_msgsize(size_t payloadlen)
2385{
2386 size_t len =
2387 NLMSG_ALIGN(sizeof(struct rtgenmsg))
2388 + nla_total_size(1) /* IP6MRA_CREPORT_MSGTYPE */
2389 + nla_total_size(4) /* IP6MRA_CREPORT_MIF_ID */
2390 /* IP6MRA_CREPORT_SRC_ADDR */
2391 + nla_total_size(sizeof(struct in6_addr))
2392 /* IP6MRA_CREPORT_DST_ADDR */
2393 + nla_total_size(sizeof(struct in6_addr))
2394 /* IP6MRA_CREPORT_PKT */
2395 + nla_total_size(payloadlen)
2396 ;
2397
2398 return len;
2399}
2400
2401static void mrt6msg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt)
2402{
2403 struct net *net = read_pnet(&mrt->net);
2404 struct nlmsghdr *nlh;
2405 struct rtgenmsg *rtgenm;
2406 struct mrt6msg *msg;
2407 struct sk_buff *skb;
2408 struct nlattr *nla;
2409 int payloadlen;
2410
2411 payloadlen = pkt->len - sizeof(struct mrt6msg);
2412 msg = (struct mrt6msg *)skb_transport_header(pkt);
2413
2414 skb = nlmsg_new(mrt6msg_netlink_msgsize(payloadlen), GFP_ATOMIC);
2415 if (!skb)
2416 goto errout;
2417
2418 nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
2419 sizeof(struct rtgenmsg), 0);
2420 if (!nlh)
2421 goto errout;
2422 rtgenm = nlmsg_data(nlh);
2423 rtgenm->rtgen_family = RTNL_FAMILY_IP6MR;
2424 if (nla_put_u8(skb, IP6MRA_CREPORT_MSGTYPE, msg->im6_msgtype) ||
2425 nla_put_u32(skb, IP6MRA_CREPORT_MIF_ID, msg->im6_mif) ||
2426 nla_put_in6_addr(skb, IP6MRA_CREPORT_SRC_ADDR,
2427 &msg->im6_src) ||
2428 nla_put_in6_addr(skb, IP6MRA_CREPORT_DST_ADDR,
2429 &msg->im6_dst))
2430 goto nla_put_failure;
2431
2432 nla = nla_reserve(skb, IP6MRA_CREPORT_PKT, payloadlen);
2433 if (!nla || skb_copy_bits(pkt, sizeof(struct mrt6msg),
2434 nla_data(nla), payloadlen))
2435 goto nla_put_failure;
2436
2437 nlmsg_end(skb, nlh);
2438
2439 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE_R, NULL, GFP_ATOMIC);
2440 return;
2441
2442nla_put_failure:
2443 nlmsg_cancel(skb, nlh);
2444errout:
2445 kfree_skb(skb);
2446 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE_R, -ENOBUFS);
2447}
2448
2449static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2450{
2451 return mr_rtm_dumproute(skb, cb, ip6mr_mr_table_iter,
2452 _ip6mr_fill_mroute, &mfc_unres_lock);
2453}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Linux IPv6 multicast routing support for BSD pim6sd
4 * Based on net/ipv4/ipmr.c.
5 *
6 * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
7 * LSIIT Laboratory, Strasbourg, France
8 * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
9 * 6WIND, Paris, France
10 * Copyright (C)2007,2008 USAGI/WIDE Project
11 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
12 */
13
14#include <linux/uaccess.h>
15#include <linux/types.h>
16#include <linux/sched.h>
17#include <linux/errno.h>
18#include <linux/mm.h>
19#include <linux/kernel.h>
20#include <linux/fcntl.h>
21#include <linux/stat.h>
22#include <linux/socket.h>
23#include <linux/inet.h>
24#include <linux/netdevice.h>
25#include <linux/inetdevice.h>
26#include <linux/proc_fs.h>
27#include <linux/seq_file.h>
28#include <linux/init.h>
29#include <linux/compat.h>
30#include <linux/rhashtable.h>
31#include <net/protocol.h>
32#include <linux/skbuff.h>
33#include <net/raw.h>
34#include <linux/notifier.h>
35#include <linux/if_arp.h>
36#include <net/checksum.h>
37#include <net/netlink.h>
38#include <net/fib_rules.h>
39
40#include <net/ipv6.h>
41#include <net/ip6_route.h>
42#include <linux/mroute6.h>
43#include <linux/pim.h>
44#include <net/addrconf.h>
45#include <linux/netfilter_ipv6.h>
46#include <linux/export.h>
47#include <net/ip6_checksum.h>
48#include <linux/netconf.h>
49#include <net/ip_tunnels.h>
50
51#include <linux/nospec.h>
52
53struct ip6mr_rule {
54 struct fib_rule common;
55};
56
57struct ip6mr_result {
58 struct mr_table *mrt;
59};
60
61/* Big lock, protecting vif table, mrt cache and mroute socket state.
62 Note that the changes are semaphored via rtnl_lock.
63 */
64
65static DEFINE_RWLOCK(mrt_lock);
66
67/* Multicast router control variables */
68
69/* Special spinlock for queue of unresolved entries */
70static DEFINE_SPINLOCK(mfc_unres_lock);
71
72/* We return to original Alan's scheme. Hash table of resolved
73 entries is changed only in process context and protected
74 with weak lock mrt_lock. Queue of unresolved entries is protected
75 with strong spinlock mfc_unres_lock.
76
77 In this case data path is free of exclusive locks at all.
78 */
79
80static struct kmem_cache *mrt_cachep __read_mostly;
81
82static struct mr_table *ip6mr_new_table(struct net *net, u32 id);
83static void ip6mr_free_table(struct mr_table *mrt);
84
85static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
86 struct net_device *dev, struct sk_buff *skb,
87 struct mfc6_cache *cache);
88static int ip6mr_cache_report(struct mr_table *mrt, struct sk_buff *pkt,
89 mifi_t mifi, int assert);
90static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
91 int cmd);
92static void mrt6msg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt);
93static int ip6mr_rtm_dumproute(struct sk_buff *skb,
94 struct netlink_callback *cb);
95static void mroute_clean_tables(struct mr_table *mrt, int flags);
96static void ipmr_expire_process(struct timer_list *t);
97
98#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
99#define ip6mr_for_each_table(mrt, net) \
100 list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list)
101
102static struct mr_table *ip6mr_mr_table_iter(struct net *net,
103 struct mr_table *mrt)
104{
105 struct mr_table *ret;
106
107 if (!mrt)
108 ret = list_entry_rcu(net->ipv6.mr6_tables.next,
109 struct mr_table, list);
110 else
111 ret = list_entry_rcu(mrt->list.next,
112 struct mr_table, list);
113
114 if (&ret->list == &net->ipv6.mr6_tables)
115 return NULL;
116 return ret;
117}
118
119static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
120{
121 struct mr_table *mrt;
122
123 ip6mr_for_each_table(mrt, net) {
124 if (mrt->id == id)
125 return mrt;
126 }
127 return NULL;
128}
129
130static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
131 struct mr_table **mrt)
132{
133 int err;
134 struct ip6mr_result res;
135 struct fib_lookup_arg arg = {
136 .result = &res,
137 .flags = FIB_LOOKUP_NOREF,
138 };
139
140 /* update flow if oif or iif point to device enslaved to l3mdev */
141 l3mdev_update_flow(net, flowi6_to_flowi(flp6));
142
143 err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
144 flowi6_to_flowi(flp6), 0, &arg);
145 if (err < 0)
146 return err;
147 *mrt = res.mrt;
148 return 0;
149}
150
151static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
152 int flags, struct fib_lookup_arg *arg)
153{
154 struct ip6mr_result *res = arg->result;
155 struct mr_table *mrt;
156
157 switch (rule->action) {
158 case FR_ACT_TO_TBL:
159 break;
160 case FR_ACT_UNREACHABLE:
161 return -ENETUNREACH;
162 case FR_ACT_PROHIBIT:
163 return -EACCES;
164 case FR_ACT_BLACKHOLE:
165 default:
166 return -EINVAL;
167 }
168
169 arg->table = fib_rule_get_table(rule, arg);
170
171 mrt = ip6mr_get_table(rule->fr_net, arg->table);
172 if (!mrt)
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 struct netlink_ext_ack *extack)
190{
191 return 0;
192}
193
194static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
195 struct nlattr **tb)
196{
197 return 1;
198}
199
200static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
201 struct fib_rule_hdr *frh)
202{
203 frh->dst_len = 0;
204 frh->src_len = 0;
205 frh->tos = 0;
206 return 0;
207}
208
209static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
210 .family = RTNL_FAMILY_IP6MR,
211 .rule_size = sizeof(struct ip6mr_rule),
212 .addr_size = sizeof(struct in6_addr),
213 .action = ip6mr_rule_action,
214 .match = ip6mr_rule_match,
215 .configure = ip6mr_rule_configure,
216 .compare = ip6mr_rule_compare,
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 mr_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 (IS_ERR(mrt)) {
237 err = PTR_ERR(mrt);
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 ip6mr_free_table(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 mr_table *mrt, *next;
258
259 rtnl_lock();
260 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
261 list_del(&mrt->list);
262 ip6mr_free_table(mrt);
263 }
264 fib_rules_unregister(net->ipv6.mr6_rules_ops);
265 rtnl_unlock();
266}
267
268static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb)
269{
270 return fib_rules_dump(net, nb, RTNL_FAMILY_IP6MR);
271}
272
273static unsigned int ip6mr_rules_seq_read(struct net *net)
274{
275 return fib_rules_seq_read(net, RTNL_FAMILY_IP6MR);
276}
277
278bool ip6mr_rule_default(const struct fib_rule *rule)
279{
280 return fib_rule_matchall(rule) && rule->action == FR_ACT_TO_TBL &&
281 rule->table == RT6_TABLE_DFLT && !rule->l3mdev;
282}
283EXPORT_SYMBOL(ip6mr_rule_default);
284#else
285#define ip6mr_for_each_table(mrt, net) \
286 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
287
288static struct mr_table *ip6mr_mr_table_iter(struct net *net,
289 struct mr_table *mrt)
290{
291 if (!mrt)
292 return net->ipv6.mrt6;
293 return NULL;
294}
295
296static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
297{
298 return net->ipv6.mrt6;
299}
300
301static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
302 struct mr_table **mrt)
303{
304 *mrt = net->ipv6.mrt6;
305 return 0;
306}
307
308static int __net_init ip6mr_rules_init(struct net *net)
309{
310 struct mr_table *mrt;
311
312 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
313 if (IS_ERR(mrt))
314 return PTR_ERR(mrt);
315 net->ipv6.mrt6 = mrt;
316 return 0;
317}
318
319static void __net_exit ip6mr_rules_exit(struct net *net)
320{
321 rtnl_lock();
322 ip6mr_free_table(net->ipv6.mrt6);
323 net->ipv6.mrt6 = NULL;
324 rtnl_unlock();
325}
326
327static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb)
328{
329 return 0;
330}
331
332static unsigned int ip6mr_rules_seq_read(struct net *net)
333{
334 return 0;
335}
336#endif
337
338static int ip6mr_hash_cmp(struct rhashtable_compare_arg *arg,
339 const void *ptr)
340{
341 const struct mfc6_cache_cmp_arg *cmparg = arg->key;
342 struct mfc6_cache *c = (struct mfc6_cache *)ptr;
343
344 return !ipv6_addr_equal(&c->mf6c_mcastgrp, &cmparg->mf6c_mcastgrp) ||
345 !ipv6_addr_equal(&c->mf6c_origin, &cmparg->mf6c_origin);
346}
347
348static const struct rhashtable_params ip6mr_rht_params = {
349 .head_offset = offsetof(struct mr_mfc, mnode),
350 .key_offset = offsetof(struct mfc6_cache, cmparg),
351 .key_len = sizeof(struct mfc6_cache_cmp_arg),
352 .nelem_hint = 3,
353 .obj_cmpfn = ip6mr_hash_cmp,
354 .automatic_shrinking = true,
355};
356
357static void ip6mr_new_table_set(struct mr_table *mrt,
358 struct net *net)
359{
360#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
361 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
362#endif
363}
364
365static struct mfc6_cache_cmp_arg ip6mr_mr_table_ops_cmparg_any = {
366 .mf6c_origin = IN6ADDR_ANY_INIT,
367 .mf6c_mcastgrp = IN6ADDR_ANY_INIT,
368};
369
370static struct mr_table_ops ip6mr_mr_table_ops = {
371 .rht_params = &ip6mr_rht_params,
372 .cmparg_any = &ip6mr_mr_table_ops_cmparg_any,
373};
374
375static struct mr_table *ip6mr_new_table(struct net *net, u32 id)
376{
377 struct mr_table *mrt;
378
379 mrt = ip6mr_get_table(net, id);
380 if (mrt)
381 return mrt;
382
383 return mr_table_alloc(net, id, &ip6mr_mr_table_ops,
384 ipmr_expire_process, ip6mr_new_table_set);
385}
386
387static void ip6mr_free_table(struct mr_table *mrt)
388{
389 del_timer_sync(&mrt->ipmr_expire_timer);
390 mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC |
391 MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC);
392 rhltable_destroy(&mrt->mfc_hash);
393 kfree(mrt);
394}
395
396#ifdef CONFIG_PROC_FS
397/* The /proc interfaces to multicast routing
398 * /proc/ip6_mr_cache /proc/ip6_mr_vif
399 */
400
401static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
402 __acquires(mrt_lock)
403{
404 struct mr_vif_iter *iter = seq->private;
405 struct net *net = seq_file_net(seq);
406 struct mr_table *mrt;
407
408 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
409 if (!mrt)
410 return ERR_PTR(-ENOENT);
411
412 iter->mrt = mrt;
413
414 read_lock(&mrt_lock);
415 return mr_vif_seq_start(seq, pos);
416}
417
418static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
419 __releases(mrt_lock)
420{
421 read_unlock(&mrt_lock);
422}
423
424static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
425{
426 struct mr_vif_iter *iter = seq->private;
427 struct mr_table *mrt = iter->mrt;
428
429 if (v == SEQ_START_TOKEN) {
430 seq_puts(seq,
431 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
432 } else {
433 const struct vif_device *vif = v;
434 const char *name = vif->dev ? vif->dev->name : "none";
435
436 seq_printf(seq,
437 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
438 vif - mrt->vif_table,
439 name, vif->bytes_in, vif->pkt_in,
440 vif->bytes_out, vif->pkt_out,
441 vif->flags);
442 }
443 return 0;
444}
445
446static const struct seq_operations ip6mr_vif_seq_ops = {
447 .start = ip6mr_vif_seq_start,
448 .next = mr_vif_seq_next,
449 .stop = ip6mr_vif_seq_stop,
450 .show = ip6mr_vif_seq_show,
451};
452
453static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
454{
455 struct net *net = seq_file_net(seq);
456 struct mr_table *mrt;
457
458 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
459 if (!mrt)
460 return ERR_PTR(-ENOENT);
461
462 return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
463}
464
465static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
466{
467 int n;
468
469 if (v == SEQ_START_TOKEN) {
470 seq_puts(seq,
471 "Group "
472 "Origin "
473 "Iif Pkts Bytes Wrong Oifs\n");
474 } else {
475 const struct mfc6_cache *mfc = v;
476 const struct mr_mfc_iter *it = seq->private;
477 struct mr_table *mrt = it->mrt;
478
479 seq_printf(seq, "%pI6 %pI6 %-3hd",
480 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
481 mfc->_c.mfc_parent);
482
483 if (it->cache != &mrt->mfc_unres_queue) {
484 seq_printf(seq, " %8lu %8lu %8lu",
485 mfc->_c.mfc_un.res.pkt,
486 mfc->_c.mfc_un.res.bytes,
487 mfc->_c.mfc_un.res.wrong_if);
488 for (n = mfc->_c.mfc_un.res.minvif;
489 n < mfc->_c.mfc_un.res.maxvif; n++) {
490 if (VIF_EXISTS(mrt, n) &&
491 mfc->_c.mfc_un.res.ttls[n] < 255)
492 seq_printf(seq,
493 " %2d:%-3d", n,
494 mfc->_c.mfc_un.res.ttls[n]);
495 }
496 } else {
497 /* unresolved mfc_caches don't contain
498 * pkt, bytes and wrong_if values
499 */
500 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
501 }
502 seq_putc(seq, '\n');
503 }
504 return 0;
505}
506
507static const struct seq_operations ipmr_mfc_seq_ops = {
508 .start = ipmr_mfc_seq_start,
509 .next = mr_mfc_seq_next,
510 .stop = mr_mfc_seq_stop,
511 .show = ipmr_mfc_seq_show,
512};
513#endif
514
515#ifdef CONFIG_IPV6_PIMSM_V2
516
517static int pim6_rcv(struct sk_buff *skb)
518{
519 struct pimreghdr *pim;
520 struct ipv6hdr *encap;
521 struct net_device *reg_dev = NULL;
522 struct net *net = dev_net(skb->dev);
523 struct mr_table *mrt;
524 struct flowi6 fl6 = {
525 .flowi6_iif = skb->dev->ifindex,
526 .flowi6_mark = skb->mark,
527 };
528 int reg_vif_num;
529
530 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
531 goto drop;
532
533 pim = (struct pimreghdr *)skb_transport_header(skb);
534 if (pim->type != ((PIM_VERSION << 4) | PIM_TYPE_REGISTER) ||
535 (pim->flags & PIM_NULL_REGISTER) ||
536 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
537 sizeof(*pim), IPPROTO_PIM,
538 csum_partial((void *)pim, sizeof(*pim), 0)) &&
539 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
540 goto drop;
541
542 /* check if the inner packet is destined to mcast group */
543 encap = (struct ipv6hdr *)(skb_transport_header(skb) +
544 sizeof(*pim));
545
546 if (!ipv6_addr_is_multicast(&encap->daddr) ||
547 encap->payload_len == 0 ||
548 ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
549 goto drop;
550
551 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
552 goto drop;
553 reg_vif_num = mrt->mroute_reg_vif_num;
554
555 read_lock(&mrt_lock);
556 if (reg_vif_num >= 0)
557 reg_dev = mrt->vif_table[reg_vif_num].dev;
558 if (reg_dev)
559 dev_hold(reg_dev);
560 read_unlock(&mrt_lock);
561
562 if (!reg_dev)
563 goto drop;
564
565 skb->mac_header = skb->network_header;
566 skb_pull(skb, (u8 *)encap - skb->data);
567 skb_reset_network_header(skb);
568 skb->protocol = htons(ETH_P_IPV6);
569 skb->ip_summed = CHECKSUM_NONE;
570
571 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
572
573 netif_rx(skb);
574
575 dev_put(reg_dev);
576 return 0;
577 drop:
578 kfree_skb(skb);
579 return 0;
580}
581
582static const struct inet6_protocol pim6_protocol = {
583 .handler = pim6_rcv,
584};
585
586/* Service routines creating virtual interfaces: PIMREG */
587
588static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
589 struct net_device *dev)
590{
591 struct net *net = dev_net(dev);
592 struct mr_table *mrt;
593 struct flowi6 fl6 = {
594 .flowi6_oif = dev->ifindex,
595 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
596 .flowi6_mark = skb->mark,
597 };
598
599 if (!pskb_inet_may_pull(skb))
600 goto tx_err;
601
602 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
603 goto tx_err;
604
605 read_lock(&mrt_lock);
606 dev->stats.tx_bytes += skb->len;
607 dev->stats.tx_packets++;
608 ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
609 read_unlock(&mrt_lock);
610 kfree_skb(skb);
611 return NETDEV_TX_OK;
612
613tx_err:
614 dev->stats.tx_errors++;
615 kfree_skb(skb);
616 return NETDEV_TX_OK;
617}
618
619static int reg_vif_get_iflink(const struct net_device *dev)
620{
621 return 0;
622}
623
624static const struct net_device_ops reg_vif_netdev_ops = {
625 .ndo_start_xmit = reg_vif_xmit,
626 .ndo_get_iflink = reg_vif_get_iflink,
627};
628
629static void reg_vif_setup(struct net_device *dev)
630{
631 dev->type = ARPHRD_PIMREG;
632 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
633 dev->flags = IFF_NOARP;
634 dev->netdev_ops = ®_vif_netdev_ops;
635 dev->needs_free_netdev = true;
636 dev->features |= NETIF_F_NETNS_LOCAL;
637}
638
639static struct net_device *ip6mr_reg_vif(struct net *net, struct mr_table *mrt)
640{
641 struct net_device *dev;
642 char name[IFNAMSIZ];
643
644 if (mrt->id == RT6_TABLE_DFLT)
645 sprintf(name, "pim6reg");
646 else
647 sprintf(name, "pim6reg%u", mrt->id);
648
649 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
650 if (!dev)
651 return NULL;
652
653 dev_net_set(dev, net);
654
655 if (register_netdevice(dev)) {
656 free_netdev(dev);
657 return NULL;
658 }
659
660 if (dev_open(dev, NULL))
661 goto failure;
662
663 dev_hold(dev);
664 return dev;
665
666failure:
667 unregister_netdevice(dev);
668 return NULL;
669}
670#endif
671
672static int call_ip6mr_vif_entry_notifiers(struct net *net,
673 enum fib_event_type event_type,
674 struct vif_device *vif,
675 mifi_t vif_index, u32 tb_id)
676{
677 return mr_call_vif_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
678 vif, vif_index, tb_id,
679 &net->ipv6.ipmr_seq);
680}
681
682static int call_ip6mr_mfc_entry_notifiers(struct net *net,
683 enum fib_event_type event_type,
684 struct mfc6_cache *mfc, u32 tb_id)
685{
686 return mr_call_mfc_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
687 &mfc->_c, tb_id, &net->ipv6.ipmr_seq);
688}
689
690/* Delete a VIF entry */
691static int mif6_delete(struct mr_table *mrt, int vifi, int notify,
692 struct list_head *head)
693{
694 struct vif_device *v;
695 struct net_device *dev;
696 struct inet6_dev *in6_dev;
697
698 if (vifi < 0 || vifi >= mrt->maxvif)
699 return -EADDRNOTAVAIL;
700
701 v = &mrt->vif_table[vifi];
702
703 if (VIF_EXISTS(mrt, vifi))
704 call_ip6mr_vif_entry_notifiers(read_pnet(&mrt->net),
705 FIB_EVENT_VIF_DEL, v, vifi,
706 mrt->id);
707
708 write_lock_bh(&mrt_lock);
709 dev = v->dev;
710 v->dev = NULL;
711
712 if (!dev) {
713 write_unlock_bh(&mrt_lock);
714 return -EADDRNOTAVAIL;
715 }
716
717#ifdef CONFIG_IPV6_PIMSM_V2
718 if (vifi == mrt->mroute_reg_vif_num)
719 mrt->mroute_reg_vif_num = -1;
720#endif
721
722 if (vifi + 1 == mrt->maxvif) {
723 int tmp;
724 for (tmp = vifi - 1; tmp >= 0; tmp--) {
725 if (VIF_EXISTS(mrt, tmp))
726 break;
727 }
728 mrt->maxvif = tmp + 1;
729 }
730
731 write_unlock_bh(&mrt_lock);
732
733 dev_set_allmulti(dev, -1);
734
735 in6_dev = __in6_dev_get(dev);
736 if (in6_dev) {
737 in6_dev->cnf.mc_forwarding--;
738 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
739 NETCONFA_MC_FORWARDING,
740 dev->ifindex, &in6_dev->cnf);
741 }
742
743 if ((v->flags & MIFF_REGISTER) && !notify)
744 unregister_netdevice_queue(dev, head);
745
746 dev_put(dev);
747 return 0;
748}
749
750static inline void ip6mr_cache_free_rcu(struct rcu_head *head)
751{
752 struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
753
754 kmem_cache_free(mrt_cachep, (struct mfc6_cache *)c);
755}
756
757static inline void ip6mr_cache_free(struct mfc6_cache *c)
758{
759 call_rcu(&c->_c.rcu, ip6mr_cache_free_rcu);
760}
761
762/* Destroy an unresolved cache entry, killing queued skbs
763 and reporting error to netlink readers.
764 */
765
766static void ip6mr_destroy_unres(struct mr_table *mrt, struct mfc6_cache *c)
767{
768 struct net *net = read_pnet(&mrt->net);
769 struct sk_buff *skb;
770
771 atomic_dec(&mrt->cache_resolve_queue_len);
772
773 while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved)) != NULL) {
774 if (ipv6_hdr(skb)->version == 0) {
775 struct nlmsghdr *nlh = skb_pull(skb,
776 sizeof(struct ipv6hdr));
777 nlh->nlmsg_type = NLMSG_ERROR;
778 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
779 skb_trim(skb, nlh->nlmsg_len);
780 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
781 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
782 } else
783 kfree_skb(skb);
784 }
785
786 ip6mr_cache_free(c);
787}
788
789
790/* Timer process for all the unresolved queue. */
791
792static void ipmr_do_expire_process(struct mr_table *mrt)
793{
794 unsigned long now = jiffies;
795 unsigned long expires = 10 * HZ;
796 struct mr_mfc *c, *next;
797
798 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
799 if (time_after(c->mfc_un.unres.expires, now)) {
800 /* not yet... */
801 unsigned long interval = c->mfc_un.unres.expires - now;
802 if (interval < expires)
803 expires = interval;
804 continue;
805 }
806
807 list_del(&c->list);
808 mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
809 ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
810 }
811
812 if (!list_empty(&mrt->mfc_unres_queue))
813 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
814}
815
816static void ipmr_expire_process(struct timer_list *t)
817{
818 struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
819
820 if (!spin_trylock(&mfc_unres_lock)) {
821 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
822 return;
823 }
824
825 if (!list_empty(&mrt->mfc_unres_queue))
826 ipmr_do_expire_process(mrt);
827
828 spin_unlock(&mfc_unres_lock);
829}
830
831/* Fill oifs list. It is called under write locked mrt_lock. */
832
833static void ip6mr_update_thresholds(struct mr_table *mrt,
834 struct mr_mfc *cache,
835 unsigned char *ttls)
836{
837 int vifi;
838
839 cache->mfc_un.res.minvif = MAXMIFS;
840 cache->mfc_un.res.maxvif = 0;
841 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
842
843 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
844 if (VIF_EXISTS(mrt, vifi) &&
845 ttls[vifi] && ttls[vifi] < 255) {
846 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
847 if (cache->mfc_un.res.minvif > vifi)
848 cache->mfc_un.res.minvif = vifi;
849 if (cache->mfc_un.res.maxvif <= vifi)
850 cache->mfc_un.res.maxvif = vifi + 1;
851 }
852 }
853 cache->mfc_un.res.lastuse = jiffies;
854}
855
856static int mif6_add(struct net *net, struct mr_table *mrt,
857 struct mif6ctl *vifc, int mrtsock)
858{
859 int vifi = vifc->mif6c_mifi;
860 struct vif_device *v = &mrt->vif_table[vifi];
861 struct net_device *dev;
862 struct inet6_dev *in6_dev;
863 int err;
864
865 /* Is vif busy ? */
866 if (VIF_EXISTS(mrt, vifi))
867 return -EADDRINUSE;
868
869 switch (vifc->mif6c_flags) {
870#ifdef CONFIG_IPV6_PIMSM_V2
871 case MIFF_REGISTER:
872 /*
873 * Special Purpose VIF in PIM
874 * All the packets will be sent to the daemon
875 */
876 if (mrt->mroute_reg_vif_num >= 0)
877 return -EADDRINUSE;
878 dev = ip6mr_reg_vif(net, mrt);
879 if (!dev)
880 return -ENOBUFS;
881 err = dev_set_allmulti(dev, 1);
882 if (err) {
883 unregister_netdevice(dev);
884 dev_put(dev);
885 return err;
886 }
887 break;
888#endif
889 case 0:
890 dev = dev_get_by_index(net, vifc->mif6c_pifi);
891 if (!dev)
892 return -EADDRNOTAVAIL;
893 err = dev_set_allmulti(dev, 1);
894 if (err) {
895 dev_put(dev);
896 return err;
897 }
898 break;
899 default:
900 return -EINVAL;
901 }
902
903 in6_dev = __in6_dev_get(dev);
904 if (in6_dev) {
905 in6_dev->cnf.mc_forwarding++;
906 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
907 NETCONFA_MC_FORWARDING,
908 dev->ifindex, &in6_dev->cnf);
909 }
910
911 /* Fill in the VIF structures */
912 vif_device_init(v, dev, vifc->vifc_rate_limit, vifc->vifc_threshold,
913 vifc->mif6c_flags | (!mrtsock ? VIFF_STATIC : 0),
914 MIFF_REGISTER);
915
916 /* And finish update writing critical data */
917 write_lock_bh(&mrt_lock);
918 v->dev = dev;
919#ifdef CONFIG_IPV6_PIMSM_V2
920 if (v->flags & MIFF_REGISTER)
921 mrt->mroute_reg_vif_num = vifi;
922#endif
923 if (vifi + 1 > mrt->maxvif)
924 mrt->maxvif = vifi + 1;
925 write_unlock_bh(&mrt_lock);
926 call_ip6mr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD,
927 v, vifi, mrt->id);
928 return 0;
929}
930
931static struct mfc6_cache *ip6mr_cache_find(struct mr_table *mrt,
932 const struct in6_addr *origin,
933 const struct in6_addr *mcastgrp)
934{
935 struct mfc6_cache_cmp_arg arg = {
936 .mf6c_origin = *origin,
937 .mf6c_mcastgrp = *mcastgrp,
938 };
939
940 return mr_mfc_find(mrt, &arg);
941}
942
943/* Look for a (*,G) entry */
944static struct mfc6_cache *ip6mr_cache_find_any(struct mr_table *mrt,
945 struct in6_addr *mcastgrp,
946 mifi_t mifi)
947{
948 struct mfc6_cache_cmp_arg arg = {
949 .mf6c_origin = in6addr_any,
950 .mf6c_mcastgrp = *mcastgrp,
951 };
952
953 if (ipv6_addr_any(mcastgrp))
954 return mr_mfc_find_any_parent(mrt, mifi);
955 return mr_mfc_find_any(mrt, mifi, &arg);
956}
957
958/* Look for a (S,G,iif) entry if parent != -1 */
959static struct mfc6_cache *
960ip6mr_cache_find_parent(struct mr_table *mrt,
961 const struct in6_addr *origin,
962 const struct in6_addr *mcastgrp,
963 int parent)
964{
965 struct mfc6_cache_cmp_arg arg = {
966 .mf6c_origin = *origin,
967 .mf6c_mcastgrp = *mcastgrp,
968 };
969
970 return mr_mfc_find_parent(mrt, &arg, parent);
971}
972
973/* Allocate a multicast cache entry */
974static struct mfc6_cache *ip6mr_cache_alloc(void)
975{
976 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
977 if (!c)
978 return NULL;
979 c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
980 c->_c.mfc_un.res.minvif = MAXMIFS;
981 c->_c.free = ip6mr_cache_free_rcu;
982 refcount_set(&c->_c.mfc_un.res.refcount, 1);
983 return c;
984}
985
986static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
987{
988 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
989 if (!c)
990 return NULL;
991 skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
992 c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
993 return c;
994}
995
996/*
997 * A cache entry has gone into a resolved state from queued
998 */
999
1000static void ip6mr_cache_resolve(struct net *net, struct mr_table *mrt,
1001 struct mfc6_cache *uc, struct mfc6_cache *c)
1002{
1003 struct sk_buff *skb;
1004
1005 /*
1006 * Play the pending entries through our router
1007 */
1008
1009 while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
1010 if (ipv6_hdr(skb)->version == 0) {
1011 struct nlmsghdr *nlh = skb_pull(skb,
1012 sizeof(struct ipv6hdr));
1013
1014 if (mr_fill_mroute(mrt, skb, &c->_c,
1015 nlmsg_data(nlh)) > 0) {
1016 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1017 } else {
1018 nlh->nlmsg_type = NLMSG_ERROR;
1019 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1020 skb_trim(skb, nlh->nlmsg_len);
1021 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
1022 }
1023 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1024 } else
1025 ip6_mr_forward(net, mrt, skb->dev, skb, c);
1026 }
1027}
1028
1029/*
1030 * Bounce a cache query up to pim6sd and netlink.
1031 *
1032 * Called under mrt_lock.
1033 */
1034
1035static int ip6mr_cache_report(struct mr_table *mrt, struct sk_buff *pkt,
1036 mifi_t mifi, int assert)
1037{
1038 struct sock *mroute6_sk;
1039 struct sk_buff *skb;
1040 struct mrt6msg *msg;
1041 int ret;
1042
1043#ifdef CONFIG_IPV6_PIMSM_V2
1044 if (assert == MRT6MSG_WHOLEPKT)
1045 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1046 +sizeof(*msg));
1047 else
1048#endif
1049 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1050
1051 if (!skb)
1052 return -ENOBUFS;
1053
1054 /* I suppose that internal messages
1055 * do not require checksums */
1056
1057 skb->ip_summed = CHECKSUM_UNNECESSARY;
1058
1059#ifdef CONFIG_IPV6_PIMSM_V2
1060 if (assert == MRT6MSG_WHOLEPKT) {
1061 /* Ugly, but we have no choice with this interface.
1062 Duplicate old header, fix length etc.
1063 And all this only to mangle msg->im6_msgtype and
1064 to set msg->im6_mbz to "mbz" :-)
1065 */
1066 skb_push(skb, -skb_network_offset(pkt));
1067
1068 skb_push(skb, sizeof(*msg));
1069 skb_reset_transport_header(skb);
1070 msg = (struct mrt6msg *)skb_transport_header(skb);
1071 msg->im6_mbz = 0;
1072 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
1073 msg->im6_mif = mrt->mroute_reg_vif_num;
1074 msg->im6_pad = 0;
1075 msg->im6_src = ipv6_hdr(pkt)->saddr;
1076 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1077
1078 skb->ip_summed = CHECKSUM_UNNECESSARY;
1079 } else
1080#endif
1081 {
1082 /*
1083 * Copy the IP header
1084 */
1085
1086 skb_put(skb, sizeof(struct ipv6hdr));
1087 skb_reset_network_header(skb);
1088 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1089
1090 /*
1091 * Add our header
1092 */
1093 skb_put(skb, sizeof(*msg));
1094 skb_reset_transport_header(skb);
1095 msg = (struct mrt6msg *)skb_transport_header(skb);
1096
1097 msg->im6_mbz = 0;
1098 msg->im6_msgtype = assert;
1099 msg->im6_mif = mifi;
1100 msg->im6_pad = 0;
1101 msg->im6_src = ipv6_hdr(pkt)->saddr;
1102 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1103
1104 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1105 skb->ip_summed = CHECKSUM_UNNECESSARY;
1106 }
1107
1108 rcu_read_lock();
1109 mroute6_sk = rcu_dereference(mrt->mroute_sk);
1110 if (!mroute6_sk) {
1111 rcu_read_unlock();
1112 kfree_skb(skb);
1113 return -EINVAL;
1114 }
1115
1116 mrt6msg_netlink_event(mrt, skb);
1117
1118 /* Deliver to user space multicast routing algorithms */
1119 ret = sock_queue_rcv_skb(mroute6_sk, skb);
1120 rcu_read_unlock();
1121 if (ret < 0) {
1122 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
1123 kfree_skb(skb);
1124 }
1125
1126 return ret;
1127}
1128
1129/* Queue a packet for resolution. It gets locked cache entry! */
1130static int ip6mr_cache_unresolved(struct mr_table *mrt, mifi_t mifi,
1131 struct sk_buff *skb, struct net_device *dev)
1132{
1133 struct mfc6_cache *c;
1134 bool found = false;
1135 int err;
1136
1137 spin_lock_bh(&mfc_unres_lock);
1138 list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
1139 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1140 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1141 found = true;
1142 break;
1143 }
1144 }
1145
1146 if (!found) {
1147 /*
1148 * Create a new entry if allowable
1149 */
1150
1151 c = ip6mr_cache_alloc_unres();
1152 if (!c) {
1153 spin_unlock_bh(&mfc_unres_lock);
1154
1155 kfree_skb(skb);
1156 return -ENOBUFS;
1157 }
1158
1159 /* Fill in the new cache entry */
1160 c->_c.mfc_parent = -1;
1161 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1162 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1163
1164 /*
1165 * Reflect first query at pim6sd
1166 */
1167 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1168 if (err < 0) {
1169 /* If the report failed throw the cache entry
1170 out - Brad Parker
1171 */
1172 spin_unlock_bh(&mfc_unres_lock);
1173
1174 ip6mr_cache_free(c);
1175 kfree_skb(skb);
1176 return err;
1177 }
1178
1179 atomic_inc(&mrt->cache_resolve_queue_len);
1180 list_add(&c->_c.list, &mrt->mfc_unres_queue);
1181 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1182
1183 ipmr_do_expire_process(mrt);
1184 }
1185
1186 /* See if we can append the packet */
1187 if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
1188 kfree_skb(skb);
1189 err = -ENOBUFS;
1190 } else {
1191 if (dev) {
1192 skb->dev = dev;
1193 skb->skb_iif = dev->ifindex;
1194 }
1195 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
1196 err = 0;
1197 }
1198
1199 spin_unlock_bh(&mfc_unres_lock);
1200 return err;
1201}
1202
1203/*
1204 * MFC6 cache manipulation by user space
1205 */
1206
1207static int ip6mr_mfc_delete(struct mr_table *mrt, struct mf6cctl *mfc,
1208 int parent)
1209{
1210 struct mfc6_cache *c;
1211
1212 /* The entries are added/deleted only under RTNL */
1213 rcu_read_lock();
1214 c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr,
1215 &mfc->mf6cc_mcastgrp.sin6_addr, parent);
1216 rcu_read_unlock();
1217 if (!c)
1218 return -ENOENT;
1219 rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ip6mr_rht_params);
1220 list_del_rcu(&c->_c.list);
1221
1222 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
1223 FIB_EVENT_ENTRY_DEL, c, mrt->id);
1224 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1225 mr_cache_put(&c->_c);
1226 return 0;
1227}
1228
1229static int ip6mr_device_event(struct notifier_block *this,
1230 unsigned long event, void *ptr)
1231{
1232 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1233 struct net *net = dev_net(dev);
1234 struct mr_table *mrt;
1235 struct vif_device *v;
1236 int ct;
1237
1238 if (event != NETDEV_UNREGISTER)
1239 return NOTIFY_DONE;
1240
1241 ip6mr_for_each_table(mrt, net) {
1242 v = &mrt->vif_table[0];
1243 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1244 if (v->dev == dev)
1245 mif6_delete(mrt, ct, 1, NULL);
1246 }
1247 }
1248
1249 return NOTIFY_DONE;
1250}
1251
1252static unsigned int ip6mr_seq_read(struct net *net)
1253{
1254 ASSERT_RTNL();
1255
1256 return net->ipv6.ipmr_seq + ip6mr_rules_seq_read(net);
1257}
1258
1259static int ip6mr_dump(struct net *net, struct notifier_block *nb)
1260{
1261 return mr_dump(net, nb, RTNL_FAMILY_IP6MR, ip6mr_rules_dump,
1262 ip6mr_mr_table_iter, &mrt_lock);
1263}
1264
1265static struct notifier_block ip6_mr_notifier = {
1266 .notifier_call = ip6mr_device_event
1267};
1268
1269static const struct fib_notifier_ops ip6mr_notifier_ops_template = {
1270 .family = RTNL_FAMILY_IP6MR,
1271 .fib_seq_read = ip6mr_seq_read,
1272 .fib_dump = ip6mr_dump,
1273 .owner = THIS_MODULE,
1274};
1275
1276static int __net_init ip6mr_notifier_init(struct net *net)
1277{
1278 struct fib_notifier_ops *ops;
1279
1280 net->ipv6.ipmr_seq = 0;
1281
1282 ops = fib_notifier_ops_register(&ip6mr_notifier_ops_template, net);
1283 if (IS_ERR(ops))
1284 return PTR_ERR(ops);
1285
1286 net->ipv6.ip6mr_notifier_ops = ops;
1287
1288 return 0;
1289}
1290
1291static void __net_exit ip6mr_notifier_exit(struct net *net)
1292{
1293 fib_notifier_ops_unregister(net->ipv6.ip6mr_notifier_ops);
1294 net->ipv6.ip6mr_notifier_ops = NULL;
1295}
1296
1297/* Setup for IP multicast routing */
1298static int __net_init ip6mr_net_init(struct net *net)
1299{
1300 int err;
1301
1302 err = ip6mr_notifier_init(net);
1303 if (err)
1304 return err;
1305
1306 err = ip6mr_rules_init(net);
1307 if (err < 0)
1308 goto ip6mr_rules_fail;
1309
1310#ifdef CONFIG_PROC_FS
1311 err = -ENOMEM;
1312 if (!proc_create_net("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_seq_ops,
1313 sizeof(struct mr_vif_iter)))
1314 goto proc_vif_fail;
1315 if (!proc_create_net("ip6_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops,
1316 sizeof(struct mr_mfc_iter)))
1317 goto proc_cache_fail;
1318#endif
1319
1320 return 0;
1321
1322#ifdef CONFIG_PROC_FS
1323proc_cache_fail:
1324 remove_proc_entry("ip6_mr_vif", net->proc_net);
1325proc_vif_fail:
1326 ip6mr_rules_exit(net);
1327#endif
1328ip6mr_rules_fail:
1329 ip6mr_notifier_exit(net);
1330 return err;
1331}
1332
1333static void __net_exit ip6mr_net_exit(struct net *net)
1334{
1335#ifdef CONFIG_PROC_FS
1336 remove_proc_entry("ip6_mr_cache", net->proc_net);
1337 remove_proc_entry("ip6_mr_vif", net->proc_net);
1338#endif
1339 ip6mr_rules_exit(net);
1340 ip6mr_notifier_exit(net);
1341}
1342
1343static struct pernet_operations ip6mr_net_ops = {
1344 .init = ip6mr_net_init,
1345 .exit = ip6mr_net_exit,
1346};
1347
1348int __init ip6_mr_init(void)
1349{
1350 int err;
1351
1352 mrt_cachep = kmem_cache_create("ip6_mrt_cache",
1353 sizeof(struct mfc6_cache),
1354 0, SLAB_HWCACHE_ALIGN,
1355 NULL);
1356 if (!mrt_cachep)
1357 return -ENOMEM;
1358
1359 err = register_pernet_subsys(&ip6mr_net_ops);
1360 if (err)
1361 goto reg_pernet_fail;
1362
1363 err = register_netdevice_notifier(&ip6_mr_notifier);
1364 if (err)
1365 goto reg_notif_fail;
1366#ifdef CONFIG_IPV6_PIMSM_V2
1367 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1368 pr_err("%s: can't add PIM protocol\n", __func__);
1369 err = -EAGAIN;
1370 goto add_proto_fail;
1371 }
1372#endif
1373 err = rtnl_register_module(THIS_MODULE, RTNL_FAMILY_IP6MR, RTM_GETROUTE,
1374 NULL, ip6mr_rtm_dumproute, 0);
1375 if (err == 0)
1376 return 0;
1377
1378#ifdef CONFIG_IPV6_PIMSM_V2
1379 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
1380add_proto_fail:
1381 unregister_netdevice_notifier(&ip6_mr_notifier);
1382#endif
1383reg_notif_fail:
1384 unregister_pernet_subsys(&ip6mr_net_ops);
1385reg_pernet_fail:
1386 kmem_cache_destroy(mrt_cachep);
1387 return err;
1388}
1389
1390void ip6_mr_cleanup(void)
1391{
1392 rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE);
1393#ifdef CONFIG_IPV6_PIMSM_V2
1394 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
1395#endif
1396 unregister_netdevice_notifier(&ip6_mr_notifier);
1397 unregister_pernet_subsys(&ip6mr_net_ops);
1398 kmem_cache_destroy(mrt_cachep);
1399}
1400
1401static int ip6mr_mfc_add(struct net *net, struct mr_table *mrt,
1402 struct mf6cctl *mfc, int mrtsock, int parent)
1403{
1404 unsigned char ttls[MAXMIFS];
1405 struct mfc6_cache *uc, *c;
1406 struct mr_mfc *_uc;
1407 bool found;
1408 int i, err;
1409
1410 if (mfc->mf6cc_parent >= MAXMIFS)
1411 return -ENFILE;
1412
1413 memset(ttls, 255, MAXMIFS);
1414 for (i = 0; i < MAXMIFS; i++) {
1415 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1416 ttls[i] = 1;
1417 }
1418
1419 /* The entries are added/deleted only under RTNL */
1420 rcu_read_lock();
1421 c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr,
1422 &mfc->mf6cc_mcastgrp.sin6_addr, parent);
1423 rcu_read_unlock();
1424 if (c) {
1425 write_lock_bh(&mrt_lock);
1426 c->_c.mfc_parent = mfc->mf6cc_parent;
1427 ip6mr_update_thresholds(mrt, &c->_c, ttls);
1428 if (!mrtsock)
1429 c->_c.mfc_flags |= MFC_STATIC;
1430 write_unlock_bh(&mrt_lock);
1431 call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE,
1432 c, mrt->id);
1433 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1434 return 0;
1435 }
1436
1437 if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
1438 !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1439 return -EINVAL;
1440
1441 c = ip6mr_cache_alloc();
1442 if (!c)
1443 return -ENOMEM;
1444
1445 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1446 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1447 c->_c.mfc_parent = mfc->mf6cc_parent;
1448 ip6mr_update_thresholds(mrt, &c->_c, ttls);
1449 if (!mrtsock)
1450 c->_c.mfc_flags |= MFC_STATIC;
1451
1452 err = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
1453 ip6mr_rht_params);
1454 if (err) {
1455 pr_err("ip6mr: rhtable insert error %d\n", err);
1456 ip6mr_cache_free(c);
1457 return err;
1458 }
1459 list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
1460
1461 /* Check to see if we resolved a queued list. If so we
1462 * need to send on the frames and tidy up.
1463 */
1464 found = false;
1465 spin_lock_bh(&mfc_unres_lock);
1466 list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
1467 uc = (struct mfc6_cache *)_uc;
1468 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1469 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1470 list_del(&_uc->list);
1471 atomic_dec(&mrt->cache_resolve_queue_len);
1472 found = true;
1473 break;
1474 }
1475 }
1476 if (list_empty(&mrt->mfc_unres_queue))
1477 del_timer(&mrt->ipmr_expire_timer);
1478 spin_unlock_bh(&mfc_unres_lock);
1479
1480 if (found) {
1481 ip6mr_cache_resolve(net, mrt, uc, c);
1482 ip6mr_cache_free(uc);
1483 }
1484 call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD,
1485 c, mrt->id);
1486 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1487 return 0;
1488}
1489
1490/*
1491 * Close the multicast socket, and clear the vif tables etc
1492 */
1493
1494static void mroute_clean_tables(struct mr_table *mrt, int flags)
1495{
1496 struct mr_mfc *c, *tmp;
1497 LIST_HEAD(list);
1498 int i;
1499
1500 /* Shut down all active vif entries */
1501 if (flags & (MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC)) {
1502 for (i = 0; i < mrt->maxvif; i++) {
1503 if (((mrt->vif_table[i].flags & VIFF_STATIC) &&
1504 !(flags & MRT6_FLUSH_MIFS_STATIC)) ||
1505 (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT6_FLUSH_MIFS)))
1506 continue;
1507 mif6_delete(mrt, i, 0, &list);
1508 }
1509 unregister_netdevice_many(&list);
1510 }
1511
1512 /* Wipe the cache */
1513 if (flags & (MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC)) {
1514 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
1515 if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC_STATIC)) ||
1516 (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC)))
1517 continue;
1518 rhltable_remove(&mrt->mfc_hash, &c->mnode, ip6mr_rht_params);
1519 list_del_rcu(&c->list);
1520 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
1521 FIB_EVENT_ENTRY_DEL,
1522 (struct mfc6_cache *)c, mrt->id);
1523 mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
1524 mr_cache_put(c);
1525 }
1526 }
1527
1528 if (flags & MRT6_FLUSH_MFC) {
1529 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1530 spin_lock_bh(&mfc_unres_lock);
1531 list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
1532 list_del(&c->list);
1533 mr6_netlink_event(mrt, (struct mfc6_cache *)c,
1534 RTM_DELROUTE);
1535 ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
1536 }
1537 spin_unlock_bh(&mfc_unres_lock);
1538 }
1539 }
1540}
1541
1542static int ip6mr_sk_init(struct mr_table *mrt, struct sock *sk)
1543{
1544 int err = 0;
1545 struct net *net = sock_net(sk);
1546
1547 rtnl_lock();
1548 write_lock_bh(&mrt_lock);
1549 if (rtnl_dereference(mrt->mroute_sk)) {
1550 err = -EADDRINUSE;
1551 } else {
1552 rcu_assign_pointer(mrt->mroute_sk, sk);
1553 sock_set_flag(sk, SOCK_RCU_FREE);
1554 net->ipv6.devconf_all->mc_forwarding++;
1555 }
1556 write_unlock_bh(&mrt_lock);
1557
1558 if (!err)
1559 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
1560 NETCONFA_MC_FORWARDING,
1561 NETCONFA_IFINDEX_ALL,
1562 net->ipv6.devconf_all);
1563 rtnl_unlock();
1564
1565 return err;
1566}
1567
1568int ip6mr_sk_done(struct sock *sk)
1569{
1570 int err = -EACCES;
1571 struct net *net = sock_net(sk);
1572 struct mr_table *mrt;
1573
1574 if (sk->sk_type != SOCK_RAW ||
1575 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1576 return err;
1577
1578 rtnl_lock();
1579 ip6mr_for_each_table(mrt, net) {
1580 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1581 write_lock_bh(&mrt_lock);
1582 RCU_INIT_POINTER(mrt->mroute_sk, NULL);
1583 /* Note that mroute_sk had SOCK_RCU_FREE set,
1584 * so the RCU grace period before sk freeing
1585 * is guaranteed by sk_destruct()
1586 */
1587 net->ipv6.devconf_all->mc_forwarding--;
1588 write_unlock_bh(&mrt_lock);
1589 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
1590 NETCONFA_MC_FORWARDING,
1591 NETCONFA_IFINDEX_ALL,
1592 net->ipv6.devconf_all);
1593
1594 mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MFC);
1595 err = 0;
1596 break;
1597 }
1598 }
1599 rtnl_unlock();
1600
1601 return err;
1602}
1603
1604bool mroute6_is_socket(struct net *net, struct sk_buff *skb)
1605{
1606 struct mr_table *mrt;
1607 struct flowi6 fl6 = {
1608 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
1609 .flowi6_oif = skb->dev->ifindex,
1610 .flowi6_mark = skb->mark,
1611 };
1612
1613 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1614 return NULL;
1615
1616 return rcu_access_pointer(mrt->mroute_sk);
1617}
1618EXPORT_SYMBOL(mroute6_is_socket);
1619
1620/*
1621 * Socket options and virtual interface manipulation. The whole
1622 * virtual interface system is a complete heap, but unfortunately
1623 * that's how BSD mrouted happens to think. Maybe one day with a proper
1624 * MOSPF/PIM router set up we can clean this up.
1625 */
1626
1627int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1628{
1629 int ret, parent = 0;
1630 struct mif6ctl vif;
1631 struct mf6cctl mfc;
1632 mifi_t mifi;
1633 struct net *net = sock_net(sk);
1634 struct mr_table *mrt;
1635
1636 if (sk->sk_type != SOCK_RAW ||
1637 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1638 return -EOPNOTSUPP;
1639
1640 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1641 if (!mrt)
1642 return -ENOENT;
1643
1644 if (optname != MRT6_INIT) {
1645 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
1646 !ns_capable(net->user_ns, CAP_NET_ADMIN))
1647 return -EACCES;
1648 }
1649
1650 switch (optname) {
1651 case MRT6_INIT:
1652 if (optlen < sizeof(int))
1653 return -EINVAL;
1654
1655 return ip6mr_sk_init(mrt, sk);
1656
1657 case MRT6_DONE:
1658 return ip6mr_sk_done(sk);
1659
1660 case MRT6_ADD_MIF:
1661 if (optlen < sizeof(vif))
1662 return -EINVAL;
1663 if (copy_from_user(&vif, optval, sizeof(vif)))
1664 return -EFAULT;
1665 if (vif.mif6c_mifi >= MAXMIFS)
1666 return -ENFILE;
1667 rtnl_lock();
1668 ret = mif6_add(net, mrt, &vif,
1669 sk == rtnl_dereference(mrt->mroute_sk));
1670 rtnl_unlock();
1671 return ret;
1672
1673 case MRT6_DEL_MIF:
1674 if (optlen < sizeof(mifi_t))
1675 return -EINVAL;
1676 if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
1677 return -EFAULT;
1678 rtnl_lock();
1679 ret = mif6_delete(mrt, mifi, 0, NULL);
1680 rtnl_unlock();
1681 return ret;
1682
1683 /*
1684 * Manipulate the forwarding caches. These live
1685 * in a sort of kernel/user symbiosis.
1686 */
1687 case MRT6_ADD_MFC:
1688 case MRT6_DEL_MFC:
1689 parent = -1;
1690 /* fall through */
1691 case MRT6_ADD_MFC_PROXY:
1692 case MRT6_DEL_MFC_PROXY:
1693 if (optlen < sizeof(mfc))
1694 return -EINVAL;
1695 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1696 return -EFAULT;
1697 if (parent == 0)
1698 parent = mfc.mf6cc_parent;
1699 rtnl_lock();
1700 if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
1701 ret = ip6mr_mfc_delete(mrt, &mfc, parent);
1702 else
1703 ret = ip6mr_mfc_add(net, mrt, &mfc,
1704 sk ==
1705 rtnl_dereference(mrt->mroute_sk),
1706 parent);
1707 rtnl_unlock();
1708 return ret;
1709
1710 case MRT6_FLUSH:
1711 {
1712 int flags;
1713
1714 if (optlen != sizeof(flags))
1715 return -EINVAL;
1716 if (get_user(flags, (int __user *)optval))
1717 return -EFAULT;
1718 rtnl_lock();
1719 mroute_clean_tables(mrt, flags);
1720 rtnl_unlock();
1721 return 0;
1722 }
1723
1724 /*
1725 * Control PIM assert (to activate pim will activate assert)
1726 */
1727 case MRT6_ASSERT:
1728 {
1729 int v;
1730
1731 if (optlen != sizeof(v))
1732 return -EINVAL;
1733 if (get_user(v, (int __user *)optval))
1734 return -EFAULT;
1735 mrt->mroute_do_assert = v;
1736 return 0;
1737 }
1738
1739#ifdef CONFIG_IPV6_PIMSM_V2
1740 case MRT6_PIM:
1741 {
1742 int v;
1743
1744 if (optlen != sizeof(v))
1745 return -EINVAL;
1746 if (get_user(v, (int __user *)optval))
1747 return -EFAULT;
1748 v = !!v;
1749 rtnl_lock();
1750 ret = 0;
1751 if (v != mrt->mroute_do_pim) {
1752 mrt->mroute_do_pim = v;
1753 mrt->mroute_do_assert = v;
1754 }
1755 rtnl_unlock();
1756 return ret;
1757 }
1758
1759#endif
1760#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1761 case MRT6_TABLE:
1762 {
1763 u32 v;
1764
1765 if (optlen != sizeof(u32))
1766 return -EINVAL;
1767 if (get_user(v, (u32 __user *)optval))
1768 return -EFAULT;
1769 /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
1770 if (v != RT_TABLE_DEFAULT && v >= 100000000)
1771 return -EINVAL;
1772 if (sk == rcu_access_pointer(mrt->mroute_sk))
1773 return -EBUSY;
1774
1775 rtnl_lock();
1776 ret = 0;
1777 mrt = ip6mr_new_table(net, v);
1778 if (IS_ERR(mrt))
1779 ret = PTR_ERR(mrt);
1780 else
1781 raw6_sk(sk)->ip6mr_table = v;
1782 rtnl_unlock();
1783 return ret;
1784 }
1785#endif
1786 /*
1787 * Spurious command, or MRT6_VERSION which you cannot
1788 * set.
1789 */
1790 default:
1791 return -ENOPROTOOPT;
1792 }
1793}
1794
1795/*
1796 * Getsock opt support for the multicast routing system.
1797 */
1798
1799int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1800 int __user *optlen)
1801{
1802 int olr;
1803 int val;
1804 struct net *net = sock_net(sk);
1805 struct mr_table *mrt;
1806
1807 if (sk->sk_type != SOCK_RAW ||
1808 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1809 return -EOPNOTSUPP;
1810
1811 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1812 if (!mrt)
1813 return -ENOENT;
1814
1815 switch (optname) {
1816 case MRT6_VERSION:
1817 val = 0x0305;
1818 break;
1819#ifdef CONFIG_IPV6_PIMSM_V2
1820 case MRT6_PIM:
1821 val = mrt->mroute_do_pim;
1822 break;
1823#endif
1824 case MRT6_ASSERT:
1825 val = mrt->mroute_do_assert;
1826 break;
1827 default:
1828 return -ENOPROTOOPT;
1829 }
1830
1831 if (get_user(olr, optlen))
1832 return -EFAULT;
1833
1834 olr = min_t(int, olr, sizeof(int));
1835 if (olr < 0)
1836 return -EINVAL;
1837
1838 if (put_user(olr, optlen))
1839 return -EFAULT;
1840 if (copy_to_user(optval, &val, olr))
1841 return -EFAULT;
1842 return 0;
1843}
1844
1845/*
1846 * The IP multicast ioctl support routines.
1847 */
1848
1849int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1850{
1851 struct sioc_sg_req6 sr;
1852 struct sioc_mif_req6 vr;
1853 struct vif_device *vif;
1854 struct mfc6_cache *c;
1855 struct net *net = sock_net(sk);
1856 struct mr_table *mrt;
1857
1858 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1859 if (!mrt)
1860 return -ENOENT;
1861
1862 switch (cmd) {
1863 case SIOCGETMIFCNT_IN6:
1864 if (copy_from_user(&vr, arg, sizeof(vr)))
1865 return -EFAULT;
1866 if (vr.mifi >= mrt->maxvif)
1867 return -EINVAL;
1868 vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif);
1869 read_lock(&mrt_lock);
1870 vif = &mrt->vif_table[vr.mifi];
1871 if (VIF_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 rcu_read_lock();
1889 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1890 if (c) {
1891 sr.pktcnt = c->_c.mfc_un.res.pkt;
1892 sr.bytecnt = c->_c.mfc_un.res.bytes;
1893 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1894 rcu_read_unlock();
1895
1896 if (copy_to_user(arg, &sr, sizeof(sr)))
1897 return -EFAULT;
1898 return 0;
1899 }
1900 rcu_read_unlock();
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 vif_device *vif;
1929 struct mfc6_cache *c;
1930 struct net *net = sock_net(sk);
1931 struct mr_table *mrt;
1932
1933 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1934 if (!mrt)
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 vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif);
1944 read_lock(&mrt_lock);
1945 vif = &mrt->vif_table[vr.mifi];
1946 if (VIF_EXISTS(mrt, vr.mifi)) {
1947 vr.icount = vif->pkt_in;
1948 vr.ocount = vif->pkt_out;
1949 vr.ibytes = vif->bytes_in;
1950 vr.obytes = vif->bytes_out;
1951 read_unlock(&mrt_lock);
1952
1953 if (copy_to_user(arg, &vr, sizeof(vr)))
1954 return -EFAULT;
1955 return 0;
1956 }
1957 read_unlock(&mrt_lock);
1958 return -EADDRNOTAVAIL;
1959 case SIOCGETSGCNT_IN6:
1960 if (copy_from_user(&sr, arg, sizeof(sr)))
1961 return -EFAULT;
1962
1963 rcu_read_lock();
1964 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1965 if (c) {
1966 sr.pktcnt = c->_c.mfc_un.res.pkt;
1967 sr.bytecnt = c->_c.mfc_un.res.bytes;
1968 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1969 rcu_read_unlock();
1970
1971 if (copy_to_user(arg, &sr, sizeof(sr)))
1972 return -EFAULT;
1973 return 0;
1974 }
1975 rcu_read_unlock();
1976 return -EADDRNOTAVAIL;
1977 default:
1978 return -ENOIOCTLCMD;
1979 }
1980}
1981#endif
1982
1983static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
1984{
1985 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
1986 IPSTATS_MIB_OUTFORWDATAGRAMS);
1987 IP6_ADD_STATS(net, ip6_dst_idev(skb_dst(skb)),
1988 IPSTATS_MIB_OUTOCTETS, skb->len);
1989 return dst_output(net, sk, skb);
1990}
1991
1992/*
1993 * Processing handlers for ip6mr_forward
1994 */
1995
1996static int ip6mr_forward2(struct net *net, struct mr_table *mrt,
1997 struct sk_buff *skb, int vifi)
1998{
1999 struct ipv6hdr *ipv6h;
2000 struct vif_device *vif = &mrt->vif_table[vifi];
2001 struct net_device *dev;
2002 struct dst_entry *dst;
2003 struct flowi6 fl6;
2004
2005 if (!vif->dev)
2006 goto out_free;
2007
2008#ifdef CONFIG_IPV6_PIMSM_V2
2009 if (vif->flags & MIFF_REGISTER) {
2010 vif->pkt_out++;
2011 vif->bytes_out += skb->len;
2012 vif->dev->stats.tx_bytes += skb->len;
2013 vif->dev->stats.tx_packets++;
2014 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
2015 goto out_free;
2016 }
2017#endif
2018
2019 ipv6h = ipv6_hdr(skb);
2020
2021 fl6 = (struct flowi6) {
2022 .flowi6_oif = vif->link,
2023 .daddr = ipv6h->daddr,
2024 };
2025
2026 dst = ip6_route_output(net, NULL, &fl6);
2027 if (dst->error) {
2028 dst_release(dst);
2029 goto out_free;
2030 }
2031
2032 skb_dst_drop(skb);
2033 skb_dst_set(skb, dst);
2034
2035 /*
2036 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
2037 * not only before forwarding, but after forwarding on all output
2038 * interfaces. It is clear, if mrouter runs a multicasting
2039 * program, it should receive packets not depending to what interface
2040 * program is joined.
2041 * If we will not make it, the program will have to join on all
2042 * interfaces. On the other hand, multihoming host (or router, but
2043 * not mrouter) cannot join to more than one interface - it will
2044 * result in receiving multiple packets.
2045 */
2046 dev = vif->dev;
2047 skb->dev = dev;
2048 vif->pkt_out++;
2049 vif->bytes_out += skb->len;
2050
2051 /* We are about to write */
2052 /* XXX: extension headers? */
2053 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
2054 goto out_free;
2055
2056 ipv6h = ipv6_hdr(skb);
2057 ipv6h->hop_limit--;
2058
2059 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
2060
2061 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
2062 net, NULL, skb, skb->dev, dev,
2063 ip6mr_forward2_finish);
2064
2065out_free:
2066 kfree_skb(skb);
2067 return 0;
2068}
2069
2070static int ip6mr_find_vif(struct mr_table *mrt, struct net_device *dev)
2071{
2072 int ct;
2073
2074 for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
2075 if (mrt->vif_table[ct].dev == dev)
2076 break;
2077 }
2078 return ct;
2079}
2080
2081static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
2082 struct net_device *dev, struct sk_buff *skb,
2083 struct mfc6_cache *c)
2084{
2085 int psend = -1;
2086 int vif, ct;
2087 int true_vifi = ip6mr_find_vif(mrt, dev);
2088
2089 vif = c->_c.mfc_parent;
2090 c->_c.mfc_un.res.pkt++;
2091 c->_c.mfc_un.res.bytes += skb->len;
2092 c->_c.mfc_un.res.lastuse = jiffies;
2093
2094 if (ipv6_addr_any(&c->mf6c_origin) && true_vifi >= 0) {
2095 struct mfc6_cache *cache_proxy;
2096
2097 /* For an (*,G) entry, we only check that the incoming
2098 * interface is part of the static tree.
2099 */
2100 rcu_read_lock();
2101 cache_proxy = mr_mfc_find_any_parent(mrt, vif);
2102 if (cache_proxy &&
2103 cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255) {
2104 rcu_read_unlock();
2105 goto forward;
2106 }
2107 rcu_read_unlock();
2108 }
2109
2110 /*
2111 * Wrong interface: drop packet and (maybe) send PIM assert.
2112 */
2113 if (mrt->vif_table[vif].dev != dev) {
2114 c->_c.mfc_un.res.wrong_if++;
2115
2116 if (true_vifi >= 0 && mrt->mroute_do_assert &&
2117 /* pimsm uses asserts, when switching from RPT to SPT,
2118 so that we cannot check that packet arrived on an oif.
2119 It is bad, but otherwise we would need to move pretty
2120 large chunk of pimd to kernel. Ough... --ANK
2121 */
2122 (mrt->mroute_do_pim ||
2123 c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
2124 time_after(jiffies,
2125 c->_c.mfc_un.res.last_assert +
2126 MFC_ASSERT_THRESH)) {
2127 c->_c.mfc_un.res.last_assert = jiffies;
2128 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2129 }
2130 goto dont_forward;
2131 }
2132
2133forward:
2134 mrt->vif_table[vif].pkt_in++;
2135 mrt->vif_table[vif].bytes_in += skb->len;
2136
2137 /*
2138 * Forward the frame
2139 */
2140 if (ipv6_addr_any(&c->mf6c_origin) &&
2141 ipv6_addr_any(&c->mf6c_mcastgrp)) {
2142 if (true_vifi >= 0 &&
2143 true_vifi != c->_c.mfc_parent &&
2144 ipv6_hdr(skb)->hop_limit >
2145 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
2146 /* It's an (*,*) entry and the packet is not coming from
2147 * the upstream: forward the packet to the upstream
2148 * only.
2149 */
2150 psend = c->_c.mfc_parent;
2151 goto last_forward;
2152 }
2153 goto dont_forward;
2154 }
2155 for (ct = c->_c.mfc_un.res.maxvif - 1;
2156 ct >= c->_c.mfc_un.res.minvif; ct--) {
2157 /* For (*,G) entry, don't forward to the incoming interface */
2158 if ((!ipv6_addr_any(&c->mf6c_origin) || ct != true_vifi) &&
2159 ipv6_hdr(skb)->hop_limit > c->_c.mfc_un.res.ttls[ct]) {
2160 if (psend != -1) {
2161 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2162 if (skb2)
2163 ip6mr_forward2(net, mrt, skb2, psend);
2164 }
2165 psend = ct;
2166 }
2167 }
2168last_forward:
2169 if (psend != -1) {
2170 ip6mr_forward2(net, mrt, skb, psend);
2171 return;
2172 }
2173
2174dont_forward:
2175 kfree_skb(skb);
2176}
2177
2178
2179/*
2180 * Multicast packets for forwarding arrive here
2181 */
2182
2183int ip6_mr_input(struct sk_buff *skb)
2184{
2185 struct mfc6_cache *cache;
2186 struct net *net = dev_net(skb->dev);
2187 struct mr_table *mrt;
2188 struct flowi6 fl6 = {
2189 .flowi6_iif = skb->dev->ifindex,
2190 .flowi6_mark = skb->mark,
2191 };
2192 int err;
2193 struct net_device *dev;
2194
2195 /* skb->dev passed in is the master dev for vrfs.
2196 * Get the proper interface that does have a vif associated with it.
2197 */
2198 dev = skb->dev;
2199 if (netif_is_l3_master(skb->dev)) {
2200 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
2201 if (!dev) {
2202 kfree_skb(skb);
2203 return -ENODEV;
2204 }
2205 }
2206
2207 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2208 if (err < 0) {
2209 kfree_skb(skb);
2210 return err;
2211 }
2212
2213 read_lock(&mrt_lock);
2214 cache = ip6mr_cache_find(mrt,
2215 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2216 if (!cache) {
2217 int vif = ip6mr_find_vif(mrt, dev);
2218
2219 if (vif >= 0)
2220 cache = ip6mr_cache_find_any(mrt,
2221 &ipv6_hdr(skb)->daddr,
2222 vif);
2223 }
2224
2225 /*
2226 * No usable cache entry
2227 */
2228 if (!cache) {
2229 int vif;
2230
2231 vif = ip6mr_find_vif(mrt, dev);
2232 if (vif >= 0) {
2233 int err = ip6mr_cache_unresolved(mrt, vif, skb, dev);
2234 read_unlock(&mrt_lock);
2235
2236 return err;
2237 }
2238 read_unlock(&mrt_lock);
2239 kfree_skb(skb);
2240 return -ENODEV;
2241 }
2242
2243 ip6_mr_forward(net, mrt, dev, skb, cache);
2244
2245 read_unlock(&mrt_lock);
2246
2247 return 0;
2248}
2249
2250int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm,
2251 u32 portid)
2252{
2253 int err;
2254 struct mr_table *mrt;
2255 struct mfc6_cache *cache;
2256 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
2257
2258 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2259 if (!mrt)
2260 return -ENOENT;
2261
2262 read_lock(&mrt_lock);
2263 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2264 if (!cache && skb->dev) {
2265 int vif = ip6mr_find_vif(mrt, skb->dev);
2266
2267 if (vif >= 0)
2268 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
2269 vif);
2270 }
2271
2272 if (!cache) {
2273 struct sk_buff *skb2;
2274 struct ipv6hdr *iph;
2275 struct net_device *dev;
2276 int vif;
2277
2278 dev = skb->dev;
2279 if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2280 read_unlock(&mrt_lock);
2281 return -ENODEV;
2282 }
2283
2284 /* really correct? */
2285 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2286 if (!skb2) {
2287 read_unlock(&mrt_lock);
2288 return -ENOMEM;
2289 }
2290
2291 NETLINK_CB(skb2).portid = portid;
2292 skb_reset_transport_header(skb2);
2293
2294 skb_put(skb2, sizeof(struct ipv6hdr));
2295 skb_reset_network_header(skb2);
2296
2297 iph = ipv6_hdr(skb2);
2298 iph->version = 0;
2299 iph->priority = 0;
2300 iph->flow_lbl[0] = 0;
2301 iph->flow_lbl[1] = 0;
2302 iph->flow_lbl[2] = 0;
2303 iph->payload_len = 0;
2304 iph->nexthdr = IPPROTO_NONE;
2305 iph->hop_limit = 0;
2306 iph->saddr = rt->rt6i_src.addr;
2307 iph->daddr = rt->rt6i_dst.addr;
2308
2309 err = ip6mr_cache_unresolved(mrt, vif, skb2, dev);
2310 read_unlock(&mrt_lock);
2311
2312 return err;
2313 }
2314
2315 err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
2316 read_unlock(&mrt_lock);
2317 return err;
2318}
2319
2320static int ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2321 u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
2322 int flags)
2323{
2324 struct nlmsghdr *nlh;
2325 struct rtmsg *rtm;
2326 int err;
2327
2328 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2329 if (!nlh)
2330 return -EMSGSIZE;
2331
2332 rtm = nlmsg_data(nlh);
2333 rtm->rtm_family = RTNL_FAMILY_IP6MR;
2334 rtm->rtm_dst_len = 128;
2335 rtm->rtm_src_len = 128;
2336 rtm->rtm_tos = 0;
2337 rtm->rtm_table = mrt->id;
2338 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2339 goto nla_put_failure;
2340 rtm->rtm_type = RTN_MULTICAST;
2341 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2342 if (c->_c.mfc_flags & MFC_STATIC)
2343 rtm->rtm_protocol = RTPROT_STATIC;
2344 else
2345 rtm->rtm_protocol = RTPROT_MROUTED;
2346 rtm->rtm_flags = 0;
2347
2348 if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) ||
2349 nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp))
2350 goto nla_put_failure;
2351 err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
2352 /* do not break the dump if cache is unresolved */
2353 if (err < 0 && err != -ENOENT)
2354 goto nla_put_failure;
2355
2356 nlmsg_end(skb, nlh);
2357 return 0;
2358
2359nla_put_failure:
2360 nlmsg_cancel(skb, nlh);
2361 return -EMSGSIZE;
2362}
2363
2364static int _ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2365 u32 portid, u32 seq, struct mr_mfc *c,
2366 int cmd, int flags)
2367{
2368 return ip6mr_fill_mroute(mrt, skb, portid, seq, (struct mfc6_cache *)c,
2369 cmd, flags);
2370}
2371
2372static int mr6_msgsize(bool unresolved, int maxvif)
2373{
2374 size_t len =
2375 NLMSG_ALIGN(sizeof(struct rtmsg))
2376 + nla_total_size(4) /* RTA_TABLE */
2377 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
2378 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
2379 ;
2380
2381 if (!unresolved)
2382 len = len
2383 + nla_total_size(4) /* RTA_IIF */
2384 + nla_total_size(0) /* RTA_MULTIPATH */
2385 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2386 /* RTA_MFC_STATS */
2387 + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
2388 ;
2389
2390 return len;
2391}
2392
2393static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
2394 int cmd)
2395{
2396 struct net *net = read_pnet(&mrt->net);
2397 struct sk_buff *skb;
2398 int err = -ENOBUFS;
2399
2400 skb = nlmsg_new(mr6_msgsize(mfc->_c.mfc_parent >= MAXMIFS, mrt->maxvif),
2401 GFP_ATOMIC);
2402 if (!skb)
2403 goto errout;
2404
2405 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2406 if (err < 0)
2407 goto errout;
2408
2409 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
2410 return;
2411
2412errout:
2413 kfree_skb(skb);
2414 if (err < 0)
2415 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
2416}
2417
2418static size_t mrt6msg_netlink_msgsize(size_t payloadlen)
2419{
2420 size_t len =
2421 NLMSG_ALIGN(sizeof(struct rtgenmsg))
2422 + nla_total_size(1) /* IP6MRA_CREPORT_MSGTYPE */
2423 + nla_total_size(4) /* IP6MRA_CREPORT_MIF_ID */
2424 /* IP6MRA_CREPORT_SRC_ADDR */
2425 + nla_total_size(sizeof(struct in6_addr))
2426 /* IP6MRA_CREPORT_DST_ADDR */
2427 + nla_total_size(sizeof(struct in6_addr))
2428 /* IP6MRA_CREPORT_PKT */
2429 + nla_total_size(payloadlen)
2430 ;
2431
2432 return len;
2433}
2434
2435static void mrt6msg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt)
2436{
2437 struct net *net = read_pnet(&mrt->net);
2438 struct nlmsghdr *nlh;
2439 struct rtgenmsg *rtgenm;
2440 struct mrt6msg *msg;
2441 struct sk_buff *skb;
2442 struct nlattr *nla;
2443 int payloadlen;
2444
2445 payloadlen = pkt->len - sizeof(struct mrt6msg);
2446 msg = (struct mrt6msg *)skb_transport_header(pkt);
2447
2448 skb = nlmsg_new(mrt6msg_netlink_msgsize(payloadlen), GFP_ATOMIC);
2449 if (!skb)
2450 goto errout;
2451
2452 nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
2453 sizeof(struct rtgenmsg), 0);
2454 if (!nlh)
2455 goto errout;
2456 rtgenm = nlmsg_data(nlh);
2457 rtgenm->rtgen_family = RTNL_FAMILY_IP6MR;
2458 if (nla_put_u8(skb, IP6MRA_CREPORT_MSGTYPE, msg->im6_msgtype) ||
2459 nla_put_u32(skb, IP6MRA_CREPORT_MIF_ID, msg->im6_mif) ||
2460 nla_put_in6_addr(skb, IP6MRA_CREPORT_SRC_ADDR,
2461 &msg->im6_src) ||
2462 nla_put_in6_addr(skb, IP6MRA_CREPORT_DST_ADDR,
2463 &msg->im6_dst))
2464 goto nla_put_failure;
2465
2466 nla = nla_reserve(skb, IP6MRA_CREPORT_PKT, payloadlen);
2467 if (!nla || skb_copy_bits(pkt, sizeof(struct mrt6msg),
2468 nla_data(nla), payloadlen))
2469 goto nla_put_failure;
2470
2471 nlmsg_end(skb, nlh);
2472
2473 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE_R, NULL, GFP_ATOMIC);
2474 return;
2475
2476nla_put_failure:
2477 nlmsg_cancel(skb, nlh);
2478errout:
2479 kfree_skb(skb);
2480 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE_R, -ENOBUFS);
2481}
2482
2483static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2484{
2485 const struct nlmsghdr *nlh = cb->nlh;
2486 struct fib_dump_filter filter = {};
2487 int err;
2488
2489 if (cb->strict_check) {
2490 err = ip_valid_fib_dump_req(sock_net(skb->sk), nlh,
2491 &filter, cb);
2492 if (err < 0)
2493 return err;
2494 }
2495
2496 if (filter.table_id) {
2497 struct mr_table *mrt;
2498
2499 mrt = ip6mr_get_table(sock_net(skb->sk), filter.table_id);
2500 if (!mrt) {
2501 if (filter.dump_all_families)
2502 return skb->len;
2503
2504 NL_SET_ERR_MSG_MOD(cb->extack, "MR table does not exist");
2505 return -ENOENT;
2506 }
2507 err = mr_table_dump(mrt, skb, cb, _ip6mr_fill_mroute,
2508 &mfc_unres_lock, &filter);
2509 return skb->len ? : err;
2510 }
2511
2512 return mr_rtm_dumproute(skb, cb, ip6mr_mr_table_iter,
2513 _ip6mr_fill_mroute, &mfc_unres_lock, &filter);
2514}