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1/*
2 * Linux IPv6 multicast routing support for BSD pim6sd
3 * Based on net/ipv4/ipmr.c.
4 *
5 * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
6 * LSIIT Laboratory, Strasbourg, France
7 * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
8 * 6WIND, Paris, France
9 * Copyright (C)2007,2008 USAGI/WIDE Project
10 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 *
17 */
18
19#include <asm/system.h>
20#include <asm/uaccess.h>
21#include <linux/types.h>
22#include <linux/sched.h>
23#include <linux/errno.h>
24#include <linux/timer.h>
25#include <linux/mm.h>
26#include <linux/kernel.h>
27#include <linux/fcntl.h>
28#include <linux/stat.h>
29#include <linux/socket.h>
30#include <linux/inet.h>
31#include <linux/netdevice.h>
32#include <linux/inetdevice.h>
33#include <linux/proc_fs.h>
34#include <linux/seq_file.h>
35#include <linux/init.h>
36#include <linux/slab.h>
37#include <linux/compat.h>
38#include <net/protocol.h>
39#include <linux/skbuff.h>
40#include <net/sock.h>
41#include <net/raw.h>
42#include <linux/notifier.h>
43#include <linux/if_arp.h>
44#include <net/checksum.h>
45#include <net/netlink.h>
46#include <net/fib_rules.h>
47
48#include <net/ipv6.h>
49#include <net/ip6_route.h>
50#include <linux/mroute6.h>
51#include <linux/pim.h>
52#include <net/addrconf.h>
53#include <linux/netfilter_ipv6.h>
54#include <net/ip6_checksum.h>
55
56struct mr6_table {
57 struct list_head list;
58#ifdef CONFIG_NET_NS
59 struct net *net;
60#endif
61 u32 id;
62 struct sock *mroute6_sk;
63 struct timer_list ipmr_expire_timer;
64 struct list_head mfc6_unres_queue;
65 struct list_head mfc6_cache_array[MFC6_LINES];
66 struct mif_device vif6_table[MAXMIFS];
67 int maxvif;
68 atomic_t cache_resolve_queue_len;
69 int mroute_do_assert;
70 int mroute_do_pim;
71#ifdef CONFIG_IPV6_PIMSM_V2
72 int mroute_reg_vif_num;
73#endif
74};
75
76struct ip6mr_rule {
77 struct fib_rule common;
78};
79
80struct ip6mr_result {
81 struct mr6_table *mrt;
82};
83
84/* Big lock, protecting vif table, mrt cache and mroute socket state.
85 Note that the changes are semaphored via rtnl_lock.
86 */
87
88static DEFINE_RWLOCK(mrt_lock);
89
90/*
91 * Multicast router control variables
92 */
93
94#define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL)
95
96/* Special spinlock for queue of unresolved entries */
97static DEFINE_SPINLOCK(mfc_unres_lock);
98
99/* We return to original Alan's scheme. Hash table of resolved
100 entries is changed only in process context and protected
101 with weak lock mrt_lock. Queue of unresolved entries is protected
102 with strong spinlock mfc_unres_lock.
103
104 In this case data path is free of exclusive locks at all.
105 */
106
107static struct kmem_cache *mrt_cachep __read_mostly;
108
109static struct mr6_table *ip6mr_new_table(struct net *net, u32 id);
110static void ip6mr_free_table(struct mr6_table *mrt);
111
112static int ip6_mr_forward(struct net *net, struct mr6_table *mrt,
113 struct sk_buff *skb, struct mfc6_cache *cache);
114static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
115 mifi_t mifi, int assert);
116static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
117 struct mfc6_cache *c, struct rtmsg *rtm);
118static int ip6mr_rtm_dumproute(struct sk_buff *skb,
119 struct netlink_callback *cb);
120static void mroute_clean_tables(struct mr6_table *mrt);
121static void ipmr_expire_process(unsigned long arg);
122
123#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
124#define ip6mr_for_each_table(mrt, net) \
125 list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list)
126
127static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
128{
129 struct mr6_table *mrt;
130
131 ip6mr_for_each_table(mrt, net) {
132 if (mrt->id == id)
133 return mrt;
134 }
135 return NULL;
136}
137
138static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
139 struct mr6_table **mrt)
140{
141 struct ip6mr_result res;
142 struct fib_lookup_arg arg = { .result = &res, };
143 int err;
144
145 err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
146 flowi6_to_flowi(flp6), 0, &arg);
147 if (err < 0)
148 return err;
149 *mrt = res.mrt;
150 return 0;
151}
152
153static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
154 int flags, struct fib_lookup_arg *arg)
155{
156 struct ip6mr_result *res = arg->result;
157 struct mr6_table *mrt;
158
159 switch (rule->action) {
160 case FR_ACT_TO_TBL:
161 break;
162 case FR_ACT_UNREACHABLE:
163 return -ENETUNREACH;
164 case FR_ACT_PROHIBIT:
165 return -EACCES;
166 case FR_ACT_BLACKHOLE:
167 default:
168 return -EINVAL;
169 }
170
171 mrt = ip6mr_get_table(rule->fr_net, rule->table);
172 if (mrt == NULL)
173 return -EAGAIN;
174 res->mrt = mrt;
175 return 0;
176}
177
178static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
179{
180 return 1;
181}
182
183static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = {
184 FRA_GENERIC_POLICY,
185};
186
187static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
188 struct fib_rule_hdr *frh, struct nlattr **tb)
189{
190 return 0;
191}
192
193static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
194 struct nlattr **tb)
195{
196 return 1;
197}
198
199static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
200 struct fib_rule_hdr *frh)
201{
202 frh->dst_len = 0;
203 frh->src_len = 0;
204 frh->tos = 0;
205 return 0;
206}
207
208static const struct fib_rules_ops __net_initdata ip6mr_rules_ops_template = {
209 .family = RTNL_FAMILY_IP6MR,
210 .rule_size = sizeof(struct ip6mr_rule),
211 .addr_size = sizeof(struct in6_addr),
212 .action = ip6mr_rule_action,
213 .match = ip6mr_rule_match,
214 .configure = ip6mr_rule_configure,
215 .compare = ip6mr_rule_compare,
216 .default_pref = fib_default_rule_pref,
217 .fill = ip6mr_rule_fill,
218 .nlgroup = RTNLGRP_IPV6_RULE,
219 .policy = ip6mr_rule_policy,
220 .owner = THIS_MODULE,
221};
222
223static int __net_init ip6mr_rules_init(struct net *net)
224{
225 struct fib_rules_ops *ops;
226 struct mr6_table *mrt;
227 int err;
228
229 ops = fib_rules_register(&ip6mr_rules_ops_template, net);
230 if (IS_ERR(ops))
231 return PTR_ERR(ops);
232
233 INIT_LIST_HEAD(&net->ipv6.mr6_tables);
234
235 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
236 if (mrt == NULL) {
237 err = -ENOMEM;
238 goto err1;
239 }
240
241 err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
242 if (err < 0)
243 goto err2;
244
245 net->ipv6.mr6_rules_ops = ops;
246 return 0;
247
248err2:
249 kfree(mrt);
250err1:
251 fib_rules_unregister(ops);
252 return err;
253}
254
255static void __net_exit ip6mr_rules_exit(struct net *net)
256{
257 struct mr6_table *mrt, *next;
258
259 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
260 list_del(&mrt->list);
261 ip6mr_free_table(mrt);
262 }
263 fib_rules_unregister(net->ipv6.mr6_rules_ops);
264}
265#else
266#define ip6mr_for_each_table(mrt, net) \
267 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
268
269static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
270{
271 return net->ipv6.mrt6;
272}
273
274static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
275 struct mr6_table **mrt)
276{
277 *mrt = net->ipv6.mrt6;
278 return 0;
279}
280
281static int __net_init ip6mr_rules_init(struct net *net)
282{
283 net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT);
284 return net->ipv6.mrt6 ? 0 : -ENOMEM;
285}
286
287static void __net_exit ip6mr_rules_exit(struct net *net)
288{
289 ip6mr_free_table(net->ipv6.mrt6);
290}
291#endif
292
293static struct mr6_table *ip6mr_new_table(struct net *net, u32 id)
294{
295 struct mr6_table *mrt;
296 unsigned int i;
297
298 mrt = ip6mr_get_table(net, id);
299 if (mrt != NULL)
300 return mrt;
301
302 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
303 if (mrt == NULL)
304 return NULL;
305 mrt->id = id;
306 write_pnet(&mrt->net, net);
307
308 /* Forwarding cache */
309 for (i = 0; i < MFC6_LINES; i++)
310 INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]);
311
312 INIT_LIST_HEAD(&mrt->mfc6_unres_queue);
313
314 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
315 (unsigned long)mrt);
316
317#ifdef CONFIG_IPV6_PIMSM_V2
318 mrt->mroute_reg_vif_num = -1;
319#endif
320#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
321 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
322#endif
323 return mrt;
324}
325
326static void ip6mr_free_table(struct mr6_table *mrt)
327{
328 del_timer(&mrt->ipmr_expire_timer);
329 mroute_clean_tables(mrt);
330 kfree(mrt);
331}
332
333#ifdef CONFIG_PROC_FS
334
335struct ipmr_mfc_iter {
336 struct seq_net_private p;
337 struct mr6_table *mrt;
338 struct list_head *cache;
339 int ct;
340};
341
342
343static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net,
344 struct ipmr_mfc_iter *it, loff_t pos)
345{
346 struct mr6_table *mrt = it->mrt;
347 struct mfc6_cache *mfc;
348
349 read_lock(&mrt_lock);
350 for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) {
351 it->cache = &mrt->mfc6_cache_array[it->ct];
352 list_for_each_entry(mfc, it->cache, list)
353 if (pos-- == 0)
354 return mfc;
355 }
356 read_unlock(&mrt_lock);
357
358 spin_lock_bh(&mfc_unres_lock);
359 it->cache = &mrt->mfc6_unres_queue;
360 list_for_each_entry(mfc, it->cache, list)
361 if (pos-- == 0)
362 return mfc;
363 spin_unlock_bh(&mfc_unres_lock);
364
365 it->cache = NULL;
366 return NULL;
367}
368
369/*
370 * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif
371 */
372
373struct ipmr_vif_iter {
374 struct seq_net_private p;
375 struct mr6_table *mrt;
376 int ct;
377};
378
379static struct mif_device *ip6mr_vif_seq_idx(struct net *net,
380 struct ipmr_vif_iter *iter,
381 loff_t pos)
382{
383 struct mr6_table *mrt = iter->mrt;
384
385 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
386 if (!MIF_EXISTS(mrt, iter->ct))
387 continue;
388 if (pos-- == 0)
389 return &mrt->vif6_table[iter->ct];
390 }
391 return NULL;
392}
393
394static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
395 __acquires(mrt_lock)
396{
397 struct ipmr_vif_iter *iter = seq->private;
398 struct net *net = seq_file_net(seq);
399 struct mr6_table *mrt;
400
401 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
402 if (mrt == NULL)
403 return ERR_PTR(-ENOENT);
404
405 iter->mrt = mrt;
406
407 read_lock(&mrt_lock);
408 return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1)
409 : SEQ_START_TOKEN;
410}
411
412static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
413{
414 struct ipmr_vif_iter *iter = seq->private;
415 struct net *net = seq_file_net(seq);
416 struct mr6_table *mrt = iter->mrt;
417
418 ++*pos;
419 if (v == SEQ_START_TOKEN)
420 return ip6mr_vif_seq_idx(net, iter, 0);
421
422 while (++iter->ct < mrt->maxvif) {
423 if (!MIF_EXISTS(mrt, iter->ct))
424 continue;
425 return &mrt->vif6_table[iter->ct];
426 }
427 return NULL;
428}
429
430static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
431 __releases(mrt_lock)
432{
433 read_unlock(&mrt_lock);
434}
435
436static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
437{
438 struct ipmr_vif_iter *iter = seq->private;
439 struct mr6_table *mrt = iter->mrt;
440
441 if (v == SEQ_START_TOKEN) {
442 seq_puts(seq,
443 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
444 } else {
445 const struct mif_device *vif = v;
446 const char *name = vif->dev ? vif->dev->name : "none";
447
448 seq_printf(seq,
449 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
450 vif - mrt->vif6_table,
451 name, vif->bytes_in, vif->pkt_in,
452 vif->bytes_out, vif->pkt_out,
453 vif->flags);
454 }
455 return 0;
456}
457
458static const struct seq_operations ip6mr_vif_seq_ops = {
459 .start = ip6mr_vif_seq_start,
460 .next = ip6mr_vif_seq_next,
461 .stop = ip6mr_vif_seq_stop,
462 .show = ip6mr_vif_seq_show,
463};
464
465static int ip6mr_vif_open(struct inode *inode, struct file *file)
466{
467 return seq_open_net(inode, file, &ip6mr_vif_seq_ops,
468 sizeof(struct ipmr_vif_iter));
469}
470
471static const struct file_operations ip6mr_vif_fops = {
472 .owner = THIS_MODULE,
473 .open = ip6mr_vif_open,
474 .read = seq_read,
475 .llseek = seq_lseek,
476 .release = seq_release_net,
477};
478
479static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
480{
481 struct ipmr_mfc_iter *it = seq->private;
482 struct net *net = seq_file_net(seq);
483 struct mr6_table *mrt;
484
485 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
486 if (mrt == NULL)
487 return ERR_PTR(-ENOENT);
488
489 it->mrt = mrt;
490 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
491 : SEQ_START_TOKEN;
492}
493
494static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
495{
496 struct mfc6_cache *mfc = v;
497 struct ipmr_mfc_iter *it = seq->private;
498 struct net *net = seq_file_net(seq);
499 struct mr6_table *mrt = it->mrt;
500
501 ++*pos;
502
503 if (v == SEQ_START_TOKEN)
504 return ipmr_mfc_seq_idx(net, seq->private, 0);
505
506 if (mfc->list.next != it->cache)
507 return list_entry(mfc->list.next, struct mfc6_cache, list);
508
509 if (it->cache == &mrt->mfc6_unres_queue)
510 goto end_of_list;
511
512 BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]);
513
514 while (++it->ct < MFC6_LINES) {
515 it->cache = &mrt->mfc6_cache_array[it->ct];
516 if (list_empty(it->cache))
517 continue;
518 return list_first_entry(it->cache, struct mfc6_cache, list);
519 }
520
521 /* exhausted cache_array, show unresolved */
522 read_unlock(&mrt_lock);
523 it->cache = &mrt->mfc6_unres_queue;
524 it->ct = 0;
525
526 spin_lock_bh(&mfc_unres_lock);
527 if (!list_empty(it->cache))
528 return list_first_entry(it->cache, struct mfc6_cache, list);
529
530 end_of_list:
531 spin_unlock_bh(&mfc_unres_lock);
532 it->cache = NULL;
533
534 return NULL;
535}
536
537static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
538{
539 struct ipmr_mfc_iter *it = seq->private;
540 struct mr6_table *mrt = it->mrt;
541
542 if (it->cache == &mrt->mfc6_unres_queue)
543 spin_unlock_bh(&mfc_unres_lock);
544 else if (it->cache == mrt->mfc6_cache_array)
545 read_unlock(&mrt_lock);
546}
547
548static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
549{
550 int n;
551
552 if (v == SEQ_START_TOKEN) {
553 seq_puts(seq,
554 "Group "
555 "Origin "
556 "Iif Pkts Bytes Wrong Oifs\n");
557 } else {
558 const struct mfc6_cache *mfc = v;
559 const struct ipmr_mfc_iter *it = seq->private;
560 struct mr6_table *mrt = it->mrt;
561
562 seq_printf(seq, "%pI6 %pI6 %-3hd",
563 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
564 mfc->mf6c_parent);
565
566 if (it->cache != &mrt->mfc6_unres_queue) {
567 seq_printf(seq, " %8lu %8lu %8lu",
568 mfc->mfc_un.res.pkt,
569 mfc->mfc_un.res.bytes,
570 mfc->mfc_un.res.wrong_if);
571 for (n = mfc->mfc_un.res.minvif;
572 n < mfc->mfc_un.res.maxvif; n++) {
573 if (MIF_EXISTS(mrt, n) &&
574 mfc->mfc_un.res.ttls[n] < 255)
575 seq_printf(seq,
576 " %2d:%-3d",
577 n, mfc->mfc_un.res.ttls[n]);
578 }
579 } else {
580 /* unresolved mfc_caches don't contain
581 * pkt, bytes and wrong_if values
582 */
583 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
584 }
585 seq_putc(seq, '\n');
586 }
587 return 0;
588}
589
590static const struct seq_operations ipmr_mfc_seq_ops = {
591 .start = ipmr_mfc_seq_start,
592 .next = ipmr_mfc_seq_next,
593 .stop = ipmr_mfc_seq_stop,
594 .show = ipmr_mfc_seq_show,
595};
596
597static int ipmr_mfc_open(struct inode *inode, struct file *file)
598{
599 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
600 sizeof(struct ipmr_mfc_iter));
601}
602
603static const struct file_operations ip6mr_mfc_fops = {
604 .owner = THIS_MODULE,
605 .open = ipmr_mfc_open,
606 .read = seq_read,
607 .llseek = seq_lseek,
608 .release = seq_release_net,
609};
610#endif
611
612#ifdef CONFIG_IPV6_PIMSM_V2
613
614static int pim6_rcv(struct sk_buff *skb)
615{
616 struct pimreghdr *pim;
617 struct ipv6hdr *encap;
618 struct net_device *reg_dev = NULL;
619 struct net *net = dev_net(skb->dev);
620 struct mr6_table *mrt;
621 struct flowi6 fl6 = {
622 .flowi6_iif = skb->dev->ifindex,
623 .flowi6_mark = skb->mark,
624 };
625 int reg_vif_num;
626
627 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
628 goto drop;
629
630 pim = (struct pimreghdr *)skb_transport_header(skb);
631 if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
632 (pim->flags & PIM_NULL_REGISTER) ||
633 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
634 sizeof(*pim), IPPROTO_PIM,
635 csum_partial((void *)pim, sizeof(*pim), 0)) &&
636 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
637 goto drop;
638
639 /* check if the inner packet is destined to mcast group */
640 encap = (struct ipv6hdr *)(skb_transport_header(skb) +
641 sizeof(*pim));
642
643 if (!ipv6_addr_is_multicast(&encap->daddr) ||
644 encap->payload_len == 0 ||
645 ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
646 goto drop;
647
648 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
649 goto drop;
650 reg_vif_num = mrt->mroute_reg_vif_num;
651
652 read_lock(&mrt_lock);
653 if (reg_vif_num >= 0)
654 reg_dev = mrt->vif6_table[reg_vif_num].dev;
655 if (reg_dev)
656 dev_hold(reg_dev);
657 read_unlock(&mrt_lock);
658
659 if (reg_dev == NULL)
660 goto drop;
661
662 skb->mac_header = skb->network_header;
663 skb_pull(skb, (u8 *)encap - skb->data);
664 skb_reset_network_header(skb);
665 skb->protocol = htons(ETH_P_IPV6);
666 skb->ip_summed = CHECKSUM_NONE;
667 skb->pkt_type = PACKET_HOST;
668
669 skb_tunnel_rx(skb, reg_dev);
670
671 netif_rx(skb);
672
673 dev_put(reg_dev);
674 return 0;
675 drop:
676 kfree_skb(skb);
677 return 0;
678}
679
680static const struct inet6_protocol pim6_protocol = {
681 .handler = pim6_rcv,
682};
683
684/* Service routines creating virtual interfaces: PIMREG */
685
686static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
687 struct net_device *dev)
688{
689 struct net *net = dev_net(dev);
690 struct mr6_table *mrt;
691 struct flowi6 fl6 = {
692 .flowi6_oif = dev->ifindex,
693 .flowi6_iif = skb->skb_iif,
694 .flowi6_mark = skb->mark,
695 };
696 int err;
697
698 err = ip6mr_fib_lookup(net, &fl6, &mrt);
699 if (err < 0) {
700 kfree_skb(skb);
701 return err;
702 }
703
704 read_lock(&mrt_lock);
705 dev->stats.tx_bytes += skb->len;
706 dev->stats.tx_packets++;
707 ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
708 read_unlock(&mrt_lock);
709 kfree_skb(skb);
710 return NETDEV_TX_OK;
711}
712
713static const struct net_device_ops reg_vif_netdev_ops = {
714 .ndo_start_xmit = reg_vif_xmit,
715};
716
717static void reg_vif_setup(struct net_device *dev)
718{
719 dev->type = ARPHRD_PIMREG;
720 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
721 dev->flags = IFF_NOARP;
722 dev->netdev_ops = ®_vif_netdev_ops;
723 dev->destructor = free_netdev;
724 dev->features |= NETIF_F_NETNS_LOCAL;
725}
726
727static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt)
728{
729 struct net_device *dev;
730 char name[IFNAMSIZ];
731
732 if (mrt->id == RT6_TABLE_DFLT)
733 sprintf(name, "pim6reg");
734 else
735 sprintf(name, "pim6reg%u", mrt->id);
736
737 dev = alloc_netdev(0, name, reg_vif_setup);
738 if (dev == NULL)
739 return NULL;
740
741 dev_net_set(dev, net);
742
743 if (register_netdevice(dev)) {
744 free_netdev(dev);
745 return NULL;
746 }
747 dev->iflink = 0;
748
749 if (dev_open(dev))
750 goto failure;
751
752 dev_hold(dev);
753 return dev;
754
755failure:
756 /* allow the register to be completed before unregistering. */
757 rtnl_unlock();
758 rtnl_lock();
759
760 unregister_netdevice(dev);
761 return NULL;
762}
763#endif
764
765/*
766 * Delete a VIF entry
767 */
768
769static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head)
770{
771 struct mif_device *v;
772 struct net_device *dev;
773 struct inet6_dev *in6_dev;
774
775 if (vifi < 0 || vifi >= mrt->maxvif)
776 return -EADDRNOTAVAIL;
777
778 v = &mrt->vif6_table[vifi];
779
780 write_lock_bh(&mrt_lock);
781 dev = v->dev;
782 v->dev = NULL;
783
784 if (!dev) {
785 write_unlock_bh(&mrt_lock);
786 return -EADDRNOTAVAIL;
787 }
788
789#ifdef CONFIG_IPV6_PIMSM_V2
790 if (vifi == mrt->mroute_reg_vif_num)
791 mrt->mroute_reg_vif_num = -1;
792#endif
793
794 if (vifi + 1 == mrt->maxvif) {
795 int tmp;
796 for (tmp = vifi - 1; tmp >= 0; tmp--) {
797 if (MIF_EXISTS(mrt, tmp))
798 break;
799 }
800 mrt->maxvif = tmp + 1;
801 }
802
803 write_unlock_bh(&mrt_lock);
804
805 dev_set_allmulti(dev, -1);
806
807 in6_dev = __in6_dev_get(dev);
808 if (in6_dev)
809 in6_dev->cnf.mc_forwarding--;
810
811 if (v->flags & MIFF_REGISTER)
812 unregister_netdevice_queue(dev, head);
813
814 dev_put(dev);
815 return 0;
816}
817
818static inline void ip6mr_cache_free(struct mfc6_cache *c)
819{
820 kmem_cache_free(mrt_cachep, c);
821}
822
823/* Destroy an unresolved cache entry, killing queued skbs
824 and reporting error to netlink readers.
825 */
826
827static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c)
828{
829 struct net *net = read_pnet(&mrt->net);
830 struct sk_buff *skb;
831
832 atomic_dec(&mrt->cache_resolve_queue_len);
833
834 while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
835 if (ipv6_hdr(skb)->version == 0) {
836 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
837 nlh->nlmsg_type = NLMSG_ERROR;
838 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
839 skb_trim(skb, nlh->nlmsg_len);
840 ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT;
841 rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
842 } else
843 kfree_skb(skb);
844 }
845
846 ip6mr_cache_free(c);
847}
848
849
850/* Timer process for all the unresolved queue. */
851
852static void ipmr_do_expire_process(struct mr6_table *mrt)
853{
854 unsigned long now = jiffies;
855 unsigned long expires = 10 * HZ;
856 struct mfc6_cache *c, *next;
857
858 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
859 if (time_after(c->mfc_un.unres.expires, now)) {
860 /* not yet... */
861 unsigned long interval = c->mfc_un.unres.expires - now;
862 if (interval < expires)
863 expires = interval;
864 continue;
865 }
866
867 list_del(&c->list);
868 ip6mr_destroy_unres(mrt, c);
869 }
870
871 if (!list_empty(&mrt->mfc6_unres_queue))
872 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
873}
874
875static void ipmr_expire_process(unsigned long arg)
876{
877 struct mr6_table *mrt = (struct mr6_table *)arg;
878
879 if (!spin_trylock(&mfc_unres_lock)) {
880 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
881 return;
882 }
883
884 if (!list_empty(&mrt->mfc6_unres_queue))
885 ipmr_do_expire_process(mrt);
886
887 spin_unlock(&mfc_unres_lock);
888}
889
890/* Fill oifs list. It is called under write locked mrt_lock. */
891
892static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache,
893 unsigned char *ttls)
894{
895 int vifi;
896
897 cache->mfc_un.res.minvif = MAXMIFS;
898 cache->mfc_un.res.maxvif = 0;
899 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
900
901 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
902 if (MIF_EXISTS(mrt, vifi) &&
903 ttls[vifi] && ttls[vifi] < 255) {
904 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
905 if (cache->mfc_un.res.minvif > vifi)
906 cache->mfc_un.res.minvif = vifi;
907 if (cache->mfc_un.res.maxvif <= vifi)
908 cache->mfc_un.res.maxvif = vifi + 1;
909 }
910 }
911}
912
913static int mif6_add(struct net *net, struct mr6_table *mrt,
914 struct mif6ctl *vifc, int mrtsock)
915{
916 int vifi = vifc->mif6c_mifi;
917 struct mif_device *v = &mrt->vif6_table[vifi];
918 struct net_device *dev;
919 struct inet6_dev *in6_dev;
920 int err;
921
922 /* Is vif busy ? */
923 if (MIF_EXISTS(mrt, vifi))
924 return -EADDRINUSE;
925
926 switch (vifc->mif6c_flags) {
927#ifdef CONFIG_IPV6_PIMSM_V2
928 case MIFF_REGISTER:
929 /*
930 * Special Purpose VIF in PIM
931 * All the packets will be sent to the daemon
932 */
933 if (mrt->mroute_reg_vif_num >= 0)
934 return -EADDRINUSE;
935 dev = ip6mr_reg_vif(net, mrt);
936 if (!dev)
937 return -ENOBUFS;
938 err = dev_set_allmulti(dev, 1);
939 if (err) {
940 unregister_netdevice(dev);
941 dev_put(dev);
942 return err;
943 }
944 break;
945#endif
946 case 0:
947 dev = dev_get_by_index(net, vifc->mif6c_pifi);
948 if (!dev)
949 return -EADDRNOTAVAIL;
950 err = dev_set_allmulti(dev, 1);
951 if (err) {
952 dev_put(dev);
953 return err;
954 }
955 break;
956 default:
957 return -EINVAL;
958 }
959
960 in6_dev = __in6_dev_get(dev);
961 if (in6_dev)
962 in6_dev->cnf.mc_forwarding++;
963
964 /*
965 * Fill in the VIF structures
966 */
967 v->rate_limit = vifc->vifc_rate_limit;
968 v->flags = vifc->mif6c_flags;
969 if (!mrtsock)
970 v->flags |= VIFF_STATIC;
971 v->threshold = vifc->vifc_threshold;
972 v->bytes_in = 0;
973 v->bytes_out = 0;
974 v->pkt_in = 0;
975 v->pkt_out = 0;
976 v->link = dev->ifindex;
977 if (v->flags & MIFF_REGISTER)
978 v->link = dev->iflink;
979
980 /* And finish update writing critical data */
981 write_lock_bh(&mrt_lock);
982 v->dev = dev;
983#ifdef CONFIG_IPV6_PIMSM_V2
984 if (v->flags & MIFF_REGISTER)
985 mrt->mroute_reg_vif_num = vifi;
986#endif
987 if (vifi + 1 > mrt->maxvif)
988 mrt->maxvif = vifi + 1;
989 write_unlock_bh(&mrt_lock);
990 return 0;
991}
992
993static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt,
994 const struct in6_addr *origin,
995 const struct in6_addr *mcastgrp)
996{
997 int line = MFC6_HASH(mcastgrp, origin);
998 struct mfc6_cache *c;
999
1000 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1001 if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
1002 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
1003 return c;
1004 }
1005 return NULL;
1006}
1007
1008/*
1009 * Allocate a multicast cache entry
1010 */
1011static struct mfc6_cache *ip6mr_cache_alloc(void)
1012{
1013 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
1014 if (c == NULL)
1015 return NULL;
1016 c->mfc_un.res.minvif = MAXMIFS;
1017 return c;
1018}
1019
1020static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
1021{
1022 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
1023 if (c == NULL)
1024 return NULL;
1025 skb_queue_head_init(&c->mfc_un.unres.unresolved);
1026 c->mfc_un.unres.expires = jiffies + 10 * HZ;
1027 return c;
1028}
1029
1030/*
1031 * A cache entry has gone into a resolved state from queued
1032 */
1033
1034static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt,
1035 struct mfc6_cache *uc, struct mfc6_cache *c)
1036{
1037 struct sk_buff *skb;
1038
1039 /*
1040 * Play the pending entries through our router
1041 */
1042
1043 while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
1044 if (ipv6_hdr(skb)->version == 0) {
1045 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
1046
1047 if (__ip6mr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) {
1048 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1049 } else {
1050 nlh->nlmsg_type = NLMSG_ERROR;
1051 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
1052 skb_trim(skb, nlh->nlmsg_len);
1053 ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE;
1054 }
1055 rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
1056 } else
1057 ip6_mr_forward(net, mrt, skb, c);
1058 }
1059}
1060
1061/*
1062 * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
1063 * expects the following bizarre scheme.
1064 *
1065 * Called under mrt_lock.
1066 */
1067
1068static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
1069 mifi_t mifi, int assert)
1070{
1071 struct sk_buff *skb;
1072 struct mrt6msg *msg;
1073 int ret;
1074
1075#ifdef CONFIG_IPV6_PIMSM_V2
1076 if (assert == MRT6MSG_WHOLEPKT)
1077 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1078 +sizeof(*msg));
1079 else
1080#endif
1081 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1082
1083 if (!skb)
1084 return -ENOBUFS;
1085
1086 /* I suppose that internal messages
1087 * do not require checksums */
1088
1089 skb->ip_summed = CHECKSUM_UNNECESSARY;
1090
1091#ifdef CONFIG_IPV6_PIMSM_V2
1092 if (assert == MRT6MSG_WHOLEPKT) {
1093 /* Ugly, but we have no choice with this interface.
1094 Duplicate old header, fix length etc.
1095 And all this only to mangle msg->im6_msgtype and
1096 to set msg->im6_mbz to "mbz" :-)
1097 */
1098 skb_push(skb, -skb_network_offset(pkt));
1099
1100 skb_push(skb, sizeof(*msg));
1101 skb_reset_transport_header(skb);
1102 msg = (struct mrt6msg *)skb_transport_header(skb);
1103 msg->im6_mbz = 0;
1104 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
1105 msg->im6_mif = mrt->mroute_reg_vif_num;
1106 msg->im6_pad = 0;
1107 ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr);
1108 ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr);
1109
1110 skb->ip_summed = CHECKSUM_UNNECESSARY;
1111 } else
1112#endif
1113 {
1114 /*
1115 * Copy the IP header
1116 */
1117
1118 skb_put(skb, sizeof(struct ipv6hdr));
1119 skb_reset_network_header(skb);
1120 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1121
1122 /*
1123 * Add our header
1124 */
1125 skb_put(skb, sizeof(*msg));
1126 skb_reset_transport_header(skb);
1127 msg = (struct mrt6msg *)skb_transport_header(skb);
1128
1129 msg->im6_mbz = 0;
1130 msg->im6_msgtype = assert;
1131 msg->im6_mif = mifi;
1132 msg->im6_pad = 0;
1133 ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr);
1134 ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr);
1135
1136 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1137 skb->ip_summed = CHECKSUM_UNNECESSARY;
1138 }
1139
1140 if (mrt->mroute6_sk == NULL) {
1141 kfree_skb(skb);
1142 return -EINVAL;
1143 }
1144
1145 /*
1146 * Deliver to user space multicast routing algorithms
1147 */
1148 ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb);
1149 if (ret < 0) {
1150 if (net_ratelimit())
1151 printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n");
1152 kfree_skb(skb);
1153 }
1154
1155 return ret;
1156}
1157
1158/*
1159 * Queue a packet for resolution. It gets locked cache entry!
1160 */
1161
1162static int
1163ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb)
1164{
1165 bool found = false;
1166 int err;
1167 struct mfc6_cache *c;
1168
1169 spin_lock_bh(&mfc_unres_lock);
1170 list_for_each_entry(c, &mrt->mfc6_unres_queue, list) {
1171 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1172 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1173 found = true;
1174 break;
1175 }
1176 }
1177
1178 if (!found) {
1179 /*
1180 * Create a new entry if allowable
1181 */
1182
1183 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1184 (c = ip6mr_cache_alloc_unres()) == NULL) {
1185 spin_unlock_bh(&mfc_unres_lock);
1186
1187 kfree_skb(skb);
1188 return -ENOBUFS;
1189 }
1190
1191 /*
1192 * Fill in the new cache entry
1193 */
1194 c->mf6c_parent = -1;
1195 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1196 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1197
1198 /*
1199 * Reflect first query at pim6sd
1200 */
1201 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1202 if (err < 0) {
1203 /* If the report failed throw the cache entry
1204 out - Brad Parker
1205 */
1206 spin_unlock_bh(&mfc_unres_lock);
1207
1208 ip6mr_cache_free(c);
1209 kfree_skb(skb);
1210 return err;
1211 }
1212
1213 atomic_inc(&mrt->cache_resolve_queue_len);
1214 list_add(&c->list, &mrt->mfc6_unres_queue);
1215
1216 ipmr_do_expire_process(mrt);
1217 }
1218
1219 /*
1220 * See if we can append the packet
1221 */
1222 if (c->mfc_un.unres.unresolved.qlen > 3) {
1223 kfree_skb(skb);
1224 err = -ENOBUFS;
1225 } else {
1226 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1227 err = 0;
1228 }
1229
1230 spin_unlock_bh(&mfc_unres_lock);
1231 return err;
1232}
1233
1234/*
1235 * MFC6 cache manipulation by user space
1236 */
1237
1238static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc)
1239{
1240 int line;
1241 struct mfc6_cache *c, *next;
1242
1243 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1244
1245 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) {
1246 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1247 ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) {
1248 write_lock_bh(&mrt_lock);
1249 list_del(&c->list);
1250 write_unlock_bh(&mrt_lock);
1251
1252 ip6mr_cache_free(c);
1253 return 0;
1254 }
1255 }
1256 return -ENOENT;
1257}
1258
1259static int ip6mr_device_event(struct notifier_block *this,
1260 unsigned long event, void *ptr)
1261{
1262 struct net_device *dev = ptr;
1263 struct net *net = dev_net(dev);
1264 struct mr6_table *mrt;
1265 struct mif_device *v;
1266 int ct;
1267 LIST_HEAD(list);
1268
1269 if (event != NETDEV_UNREGISTER)
1270 return NOTIFY_DONE;
1271
1272 ip6mr_for_each_table(mrt, net) {
1273 v = &mrt->vif6_table[0];
1274 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1275 if (v->dev == dev)
1276 mif6_delete(mrt, ct, &list);
1277 }
1278 }
1279 unregister_netdevice_many(&list);
1280
1281 return NOTIFY_DONE;
1282}
1283
1284static struct notifier_block ip6_mr_notifier = {
1285 .notifier_call = ip6mr_device_event
1286};
1287
1288/*
1289 * Setup for IP multicast routing
1290 */
1291
1292static int __net_init ip6mr_net_init(struct net *net)
1293{
1294 int err;
1295
1296 err = ip6mr_rules_init(net);
1297 if (err < 0)
1298 goto fail;
1299
1300#ifdef CONFIG_PROC_FS
1301 err = -ENOMEM;
1302 if (!proc_net_fops_create(net, "ip6_mr_vif", 0, &ip6mr_vif_fops))
1303 goto proc_vif_fail;
1304 if (!proc_net_fops_create(net, "ip6_mr_cache", 0, &ip6mr_mfc_fops))
1305 goto proc_cache_fail;
1306#endif
1307
1308 return 0;
1309
1310#ifdef CONFIG_PROC_FS
1311proc_cache_fail:
1312 proc_net_remove(net, "ip6_mr_vif");
1313proc_vif_fail:
1314 ip6mr_rules_exit(net);
1315#endif
1316fail:
1317 return err;
1318}
1319
1320static void __net_exit ip6mr_net_exit(struct net *net)
1321{
1322#ifdef CONFIG_PROC_FS
1323 proc_net_remove(net, "ip6_mr_cache");
1324 proc_net_remove(net, "ip6_mr_vif");
1325#endif
1326 ip6mr_rules_exit(net);
1327}
1328
1329static struct pernet_operations ip6mr_net_ops = {
1330 .init = ip6mr_net_init,
1331 .exit = ip6mr_net_exit,
1332};
1333
1334int __init ip6_mr_init(void)
1335{
1336 int err;
1337
1338 mrt_cachep = kmem_cache_create("ip6_mrt_cache",
1339 sizeof(struct mfc6_cache),
1340 0, SLAB_HWCACHE_ALIGN,
1341 NULL);
1342 if (!mrt_cachep)
1343 return -ENOMEM;
1344
1345 err = register_pernet_subsys(&ip6mr_net_ops);
1346 if (err)
1347 goto reg_pernet_fail;
1348
1349 err = register_netdevice_notifier(&ip6_mr_notifier);
1350 if (err)
1351 goto reg_notif_fail;
1352#ifdef CONFIG_IPV6_PIMSM_V2
1353 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1354 printk(KERN_ERR "ip6_mr_init: can't add PIM protocol\n");
1355 err = -EAGAIN;
1356 goto add_proto_fail;
1357 }
1358#endif
1359 rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL,
1360 ip6mr_rtm_dumproute, NULL);
1361 return 0;
1362#ifdef CONFIG_IPV6_PIMSM_V2
1363add_proto_fail:
1364 unregister_netdevice_notifier(&ip6_mr_notifier);
1365#endif
1366reg_notif_fail:
1367 unregister_pernet_subsys(&ip6mr_net_ops);
1368reg_pernet_fail:
1369 kmem_cache_destroy(mrt_cachep);
1370 return err;
1371}
1372
1373void ip6_mr_cleanup(void)
1374{
1375 unregister_netdevice_notifier(&ip6_mr_notifier);
1376 unregister_pernet_subsys(&ip6mr_net_ops);
1377 kmem_cache_destroy(mrt_cachep);
1378}
1379
1380static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt,
1381 struct mf6cctl *mfc, int mrtsock)
1382{
1383 bool found = false;
1384 int line;
1385 struct mfc6_cache *uc, *c;
1386 unsigned char ttls[MAXMIFS];
1387 int i;
1388
1389 if (mfc->mf6cc_parent >= MAXMIFS)
1390 return -ENFILE;
1391
1392 memset(ttls, 255, MAXMIFS);
1393 for (i = 0; i < MAXMIFS; i++) {
1394 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1395 ttls[i] = 1;
1396
1397 }
1398
1399 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1400
1401 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1402 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1403 ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) {
1404 found = true;
1405 break;
1406 }
1407 }
1408
1409 if (found) {
1410 write_lock_bh(&mrt_lock);
1411 c->mf6c_parent = mfc->mf6cc_parent;
1412 ip6mr_update_thresholds(mrt, c, ttls);
1413 if (!mrtsock)
1414 c->mfc_flags |= MFC_STATIC;
1415 write_unlock_bh(&mrt_lock);
1416 return 0;
1417 }
1418
1419 if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1420 return -EINVAL;
1421
1422 c = ip6mr_cache_alloc();
1423 if (c == NULL)
1424 return -ENOMEM;
1425
1426 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1427 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1428 c->mf6c_parent = mfc->mf6cc_parent;
1429 ip6mr_update_thresholds(mrt, c, ttls);
1430 if (!mrtsock)
1431 c->mfc_flags |= MFC_STATIC;
1432
1433 write_lock_bh(&mrt_lock);
1434 list_add(&c->list, &mrt->mfc6_cache_array[line]);
1435 write_unlock_bh(&mrt_lock);
1436
1437 /*
1438 * Check to see if we resolved a queued list. If so we
1439 * need to send on the frames and tidy up.
1440 */
1441 found = false;
1442 spin_lock_bh(&mfc_unres_lock);
1443 list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) {
1444 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1445 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1446 list_del(&uc->list);
1447 atomic_dec(&mrt->cache_resolve_queue_len);
1448 found = true;
1449 break;
1450 }
1451 }
1452 if (list_empty(&mrt->mfc6_unres_queue))
1453 del_timer(&mrt->ipmr_expire_timer);
1454 spin_unlock_bh(&mfc_unres_lock);
1455
1456 if (found) {
1457 ip6mr_cache_resolve(net, mrt, uc, c);
1458 ip6mr_cache_free(uc);
1459 }
1460 return 0;
1461}
1462
1463/*
1464 * Close the multicast socket, and clear the vif tables etc
1465 */
1466
1467static void mroute_clean_tables(struct mr6_table *mrt)
1468{
1469 int i;
1470 LIST_HEAD(list);
1471 struct mfc6_cache *c, *next;
1472
1473 /*
1474 * Shut down all active vif entries
1475 */
1476 for (i = 0; i < mrt->maxvif; i++) {
1477 if (!(mrt->vif6_table[i].flags & VIFF_STATIC))
1478 mif6_delete(mrt, i, &list);
1479 }
1480 unregister_netdevice_many(&list);
1481
1482 /*
1483 * Wipe the cache
1484 */
1485 for (i = 0; i < MFC6_LINES; i++) {
1486 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) {
1487 if (c->mfc_flags & MFC_STATIC)
1488 continue;
1489 write_lock_bh(&mrt_lock);
1490 list_del(&c->list);
1491 write_unlock_bh(&mrt_lock);
1492
1493 ip6mr_cache_free(c);
1494 }
1495 }
1496
1497 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1498 spin_lock_bh(&mfc_unres_lock);
1499 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
1500 list_del(&c->list);
1501 ip6mr_destroy_unres(mrt, c);
1502 }
1503 spin_unlock_bh(&mfc_unres_lock);
1504 }
1505}
1506
1507static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk)
1508{
1509 int err = 0;
1510 struct net *net = sock_net(sk);
1511
1512 rtnl_lock();
1513 write_lock_bh(&mrt_lock);
1514 if (likely(mrt->mroute6_sk == NULL)) {
1515 mrt->mroute6_sk = sk;
1516 net->ipv6.devconf_all->mc_forwarding++;
1517 }
1518 else
1519 err = -EADDRINUSE;
1520 write_unlock_bh(&mrt_lock);
1521
1522 rtnl_unlock();
1523
1524 return err;
1525}
1526
1527int ip6mr_sk_done(struct sock *sk)
1528{
1529 int err = -EACCES;
1530 struct net *net = sock_net(sk);
1531 struct mr6_table *mrt;
1532
1533 rtnl_lock();
1534 ip6mr_for_each_table(mrt, net) {
1535 if (sk == mrt->mroute6_sk) {
1536 write_lock_bh(&mrt_lock);
1537 mrt->mroute6_sk = NULL;
1538 net->ipv6.devconf_all->mc_forwarding--;
1539 write_unlock_bh(&mrt_lock);
1540
1541 mroute_clean_tables(mrt);
1542 err = 0;
1543 break;
1544 }
1545 }
1546 rtnl_unlock();
1547
1548 return err;
1549}
1550
1551struct sock *mroute6_socket(struct net *net, struct sk_buff *skb)
1552{
1553 struct mr6_table *mrt;
1554 struct flowi6 fl6 = {
1555 .flowi6_iif = skb->skb_iif,
1556 .flowi6_oif = skb->dev->ifindex,
1557 .flowi6_mark = skb->mark,
1558 };
1559
1560 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1561 return NULL;
1562
1563 return mrt->mroute6_sk;
1564}
1565
1566/*
1567 * Socket options and virtual interface manipulation. The whole
1568 * virtual interface system is a complete heap, but unfortunately
1569 * that's how BSD mrouted happens to think. Maybe one day with a proper
1570 * MOSPF/PIM router set up we can clean this up.
1571 */
1572
1573int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1574{
1575 int ret;
1576 struct mif6ctl vif;
1577 struct mf6cctl mfc;
1578 mifi_t mifi;
1579 struct net *net = sock_net(sk);
1580 struct mr6_table *mrt;
1581
1582 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1583 if (mrt == NULL)
1584 return -ENOENT;
1585
1586 if (optname != MRT6_INIT) {
1587 if (sk != mrt->mroute6_sk && !capable(CAP_NET_ADMIN))
1588 return -EACCES;
1589 }
1590
1591 switch (optname) {
1592 case MRT6_INIT:
1593 if (sk->sk_type != SOCK_RAW ||
1594 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1595 return -EOPNOTSUPP;
1596 if (optlen < sizeof(int))
1597 return -EINVAL;
1598
1599 return ip6mr_sk_init(mrt, sk);
1600
1601 case MRT6_DONE:
1602 return ip6mr_sk_done(sk);
1603
1604 case MRT6_ADD_MIF:
1605 if (optlen < sizeof(vif))
1606 return -EINVAL;
1607 if (copy_from_user(&vif, optval, sizeof(vif)))
1608 return -EFAULT;
1609 if (vif.mif6c_mifi >= MAXMIFS)
1610 return -ENFILE;
1611 rtnl_lock();
1612 ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk);
1613 rtnl_unlock();
1614 return ret;
1615
1616 case MRT6_DEL_MIF:
1617 if (optlen < sizeof(mifi_t))
1618 return -EINVAL;
1619 if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
1620 return -EFAULT;
1621 rtnl_lock();
1622 ret = mif6_delete(mrt, mifi, NULL);
1623 rtnl_unlock();
1624 return ret;
1625
1626 /*
1627 * Manipulate the forwarding caches. These live
1628 * in a sort of kernel/user symbiosis.
1629 */
1630 case MRT6_ADD_MFC:
1631 case MRT6_DEL_MFC:
1632 if (optlen < sizeof(mfc))
1633 return -EINVAL;
1634 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1635 return -EFAULT;
1636 rtnl_lock();
1637 if (optname == MRT6_DEL_MFC)
1638 ret = ip6mr_mfc_delete(mrt, &mfc);
1639 else
1640 ret = ip6mr_mfc_add(net, mrt, &mfc, sk == mrt->mroute6_sk);
1641 rtnl_unlock();
1642 return ret;
1643
1644 /*
1645 * Control PIM assert (to activate pim will activate assert)
1646 */
1647 case MRT6_ASSERT:
1648 {
1649 int v;
1650 if (get_user(v, (int __user *)optval))
1651 return -EFAULT;
1652 mrt->mroute_do_assert = !!v;
1653 return 0;
1654 }
1655
1656#ifdef CONFIG_IPV6_PIMSM_V2
1657 case MRT6_PIM:
1658 {
1659 int v;
1660 if (get_user(v, (int __user *)optval))
1661 return -EFAULT;
1662 v = !!v;
1663 rtnl_lock();
1664 ret = 0;
1665 if (v != mrt->mroute_do_pim) {
1666 mrt->mroute_do_pim = v;
1667 mrt->mroute_do_assert = v;
1668 }
1669 rtnl_unlock();
1670 return ret;
1671 }
1672
1673#endif
1674#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1675 case MRT6_TABLE:
1676 {
1677 u32 v;
1678
1679 if (optlen != sizeof(u32))
1680 return -EINVAL;
1681 if (get_user(v, (u32 __user *)optval))
1682 return -EFAULT;
1683 if (sk == mrt->mroute6_sk)
1684 return -EBUSY;
1685
1686 rtnl_lock();
1687 ret = 0;
1688 if (!ip6mr_new_table(net, v))
1689 ret = -ENOMEM;
1690 raw6_sk(sk)->ip6mr_table = v;
1691 rtnl_unlock();
1692 return ret;
1693 }
1694#endif
1695 /*
1696 * Spurious command, or MRT6_VERSION which you cannot
1697 * set.
1698 */
1699 default:
1700 return -ENOPROTOOPT;
1701 }
1702}
1703
1704/*
1705 * Getsock opt support for the multicast routing system.
1706 */
1707
1708int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1709 int __user *optlen)
1710{
1711 int olr;
1712 int val;
1713 struct net *net = sock_net(sk);
1714 struct mr6_table *mrt;
1715
1716 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1717 if (mrt == NULL)
1718 return -ENOENT;
1719
1720 switch (optname) {
1721 case MRT6_VERSION:
1722 val = 0x0305;
1723 break;
1724#ifdef CONFIG_IPV6_PIMSM_V2
1725 case MRT6_PIM:
1726 val = mrt->mroute_do_pim;
1727 break;
1728#endif
1729 case MRT6_ASSERT:
1730 val = mrt->mroute_do_assert;
1731 break;
1732 default:
1733 return -ENOPROTOOPT;
1734 }
1735
1736 if (get_user(olr, optlen))
1737 return -EFAULT;
1738
1739 olr = min_t(int, olr, sizeof(int));
1740 if (olr < 0)
1741 return -EINVAL;
1742
1743 if (put_user(olr, optlen))
1744 return -EFAULT;
1745 if (copy_to_user(optval, &val, olr))
1746 return -EFAULT;
1747 return 0;
1748}
1749
1750/*
1751 * The IP multicast ioctl support routines.
1752 */
1753
1754int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1755{
1756 struct sioc_sg_req6 sr;
1757 struct sioc_mif_req6 vr;
1758 struct mif_device *vif;
1759 struct mfc6_cache *c;
1760 struct net *net = sock_net(sk);
1761 struct mr6_table *mrt;
1762
1763 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1764 if (mrt == NULL)
1765 return -ENOENT;
1766
1767 switch (cmd) {
1768 case SIOCGETMIFCNT_IN6:
1769 if (copy_from_user(&vr, arg, sizeof(vr)))
1770 return -EFAULT;
1771 if (vr.mifi >= mrt->maxvif)
1772 return -EINVAL;
1773 read_lock(&mrt_lock);
1774 vif = &mrt->vif6_table[vr.mifi];
1775 if (MIF_EXISTS(mrt, vr.mifi)) {
1776 vr.icount = vif->pkt_in;
1777 vr.ocount = vif->pkt_out;
1778 vr.ibytes = vif->bytes_in;
1779 vr.obytes = vif->bytes_out;
1780 read_unlock(&mrt_lock);
1781
1782 if (copy_to_user(arg, &vr, sizeof(vr)))
1783 return -EFAULT;
1784 return 0;
1785 }
1786 read_unlock(&mrt_lock);
1787 return -EADDRNOTAVAIL;
1788 case SIOCGETSGCNT_IN6:
1789 if (copy_from_user(&sr, arg, sizeof(sr)))
1790 return -EFAULT;
1791
1792 read_lock(&mrt_lock);
1793 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1794 if (c) {
1795 sr.pktcnt = c->mfc_un.res.pkt;
1796 sr.bytecnt = c->mfc_un.res.bytes;
1797 sr.wrong_if = c->mfc_un.res.wrong_if;
1798 read_unlock(&mrt_lock);
1799
1800 if (copy_to_user(arg, &sr, sizeof(sr)))
1801 return -EFAULT;
1802 return 0;
1803 }
1804 read_unlock(&mrt_lock);
1805 return -EADDRNOTAVAIL;
1806 default:
1807 return -ENOIOCTLCMD;
1808 }
1809}
1810
1811#ifdef CONFIG_COMPAT
1812struct compat_sioc_sg_req6 {
1813 struct sockaddr_in6 src;
1814 struct sockaddr_in6 grp;
1815 compat_ulong_t pktcnt;
1816 compat_ulong_t bytecnt;
1817 compat_ulong_t wrong_if;
1818};
1819
1820struct compat_sioc_mif_req6 {
1821 mifi_t mifi;
1822 compat_ulong_t icount;
1823 compat_ulong_t ocount;
1824 compat_ulong_t ibytes;
1825 compat_ulong_t obytes;
1826};
1827
1828int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1829{
1830 struct compat_sioc_sg_req6 sr;
1831 struct compat_sioc_mif_req6 vr;
1832 struct mif_device *vif;
1833 struct mfc6_cache *c;
1834 struct net *net = sock_net(sk);
1835 struct mr6_table *mrt;
1836
1837 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1838 if (mrt == NULL)
1839 return -ENOENT;
1840
1841 switch (cmd) {
1842 case SIOCGETMIFCNT_IN6:
1843 if (copy_from_user(&vr, arg, sizeof(vr)))
1844 return -EFAULT;
1845 if (vr.mifi >= mrt->maxvif)
1846 return -EINVAL;
1847 read_lock(&mrt_lock);
1848 vif = &mrt->vif6_table[vr.mifi];
1849 if (MIF_EXISTS(mrt, vr.mifi)) {
1850 vr.icount = vif->pkt_in;
1851 vr.ocount = vif->pkt_out;
1852 vr.ibytes = vif->bytes_in;
1853 vr.obytes = vif->bytes_out;
1854 read_unlock(&mrt_lock);
1855
1856 if (copy_to_user(arg, &vr, sizeof(vr)))
1857 return -EFAULT;
1858 return 0;
1859 }
1860 read_unlock(&mrt_lock);
1861 return -EADDRNOTAVAIL;
1862 case SIOCGETSGCNT_IN6:
1863 if (copy_from_user(&sr, arg, sizeof(sr)))
1864 return -EFAULT;
1865
1866 read_lock(&mrt_lock);
1867 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1868 if (c) {
1869 sr.pktcnt = c->mfc_un.res.pkt;
1870 sr.bytecnt = c->mfc_un.res.bytes;
1871 sr.wrong_if = c->mfc_un.res.wrong_if;
1872 read_unlock(&mrt_lock);
1873
1874 if (copy_to_user(arg, &sr, sizeof(sr)))
1875 return -EFAULT;
1876 return 0;
1877 }
1878 read_unlock(&mrt_lock);
1879 return -EADDRNOTAVAIL;
1880 default:
1881 return -ENOIOCTLCMD;
1882 }
1883}
1884#endif
1885
1886static inline int ip6mr_forward2_finish(struct sk_buff *skb)
1887{
1888 IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
1889 IPSTATS_MIB_OUTFORWDATAGRAMS);
1890 return dst_output(skb);
1891}
1892
1893/*
1894 * Processing handlers for ip6mr_forward
1895 */
1896
1897static int ip6mr_forward2(struct net *net, struct mr6_table *mrt,
1898 struct sk_buff *skb, struct mfc6_cache *c, int vifi)
1899{
1900 struct ipv6hdr *ipv6h;
1901 struct mif_device *vif = &mrt->vif6_table[vifi];
1902 struct net_device *dev;
1903 struct dst_entry *dst;
1904 struct flowi6 fl6;
1905
1906 if (vif->dev == NULL)
1907 goto out_free;
1908
1909#ifdef CONFIG_IPV6_PIMSM_V2
1910 if (vif->flags & MIFF_REGISTER) {
1911 vif->pkt_out++;
1912 vif->bytes_out += skb->len;
1913 vif->dev->stats.tx_bytes += skb->len;
1914 vif->dev->stats.tx_packets++;
1915 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
1916 goto out_free;
1917 }
1918#endif
1919
1920 ipv6h = ipv6_hdr(skb);
1921
1922 fl6 = (struct flowi6) {
1923 .flowi6_oif = vif->link,
1924 .daddr = ipv6h->daddr,
1925 };
1926
1927 dst = ip6_route_output(net, NULL, &fl6);
1928 if (!dst)
1929 goto out_free;
1930
1931 skb_dst_drop(skb);
1932 skb_dst_set(skb, dst);
1933
1934 /*
1935 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1936 * not only before forwarding, but after forwarding on all output
1937 * interfaces. It is clear, if mrouter runs a multicasting
1938 * program, it should receive packets not depending to what interface
1939 * program is joined.
1940 * If we will not make it, the program will have to join on all
1941 * interfaces. On the other hand, multihoming host (or router, but
1942 * not mrouter) cannot join to more than one interface - it will
1943 * result in receiving multiple packets.
1944 */
1945 dev = vif->dev;
1946 skb->dev = dev;
1947 vif->pkt_out++;
1948 vif->bytes_out += skb->len;
1949
1950 /* We are about to write */
1951 /* XXX: extension headers? */
1952 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
1953 goto out_free;
1954
1955 ipv6h = ipv6_hdr(skb);
1956 ipv6h->hop_limit--;
1957
1958 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
1959
1960 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dev,
1961 ip6mr_forward2_finish);
1962
1963out_free:
1964 kfree_skb(skb);
1965 return 0;
1966}
1967
1968static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev)
1969{
1970 int ct;
1971
1972 for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
1973 if (mrt->vif6_table[ct].dev == dev)
1974 break;
1975 }
1976 return ct;
1977}
1978
1979static int ip6_mr_forward(struct net *net, struct mr6_table *mrt,
1980 struct sk_buff *skb, struct mfc6_cache *cache)
1981{
1982 int psend = -1;
1983 int vif, ct;
1984
1985 vif = cache->mf6c_parent;
1986 cache->mfc_un.res.pkt++;
1987 cache->mfc_un.res.bytes += skb->len;
1988
1989 /*
1990 * Wrong interface: drop packet and (maybe) send PIM assert.
1991 */
1992 if (mrt->vif6_table[vif].dev != skb->dev) {
1993 int true_vifi;
1994
1995 cache->mfc_un.res.wrong_if++;
1996 true_vifi = ip6mr_find_vif(mrt, skb->dev);
1997
1998 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1999 /* pimsm uses asserts, when switching from RPT to SPT,
2000 so that we cannot check that packet arrived on an oif.
2001 It is bad, but otherwise we would need to move pretty
2002 large chunk of pimd to kernel. Ough... --ANK
2003 */
2004 (mrt->mroute_do_pim ||
2005 cache->mfc_un.res.ttls[true_vifi] < 255) &&
2006 time_after(jiffies,
2007 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
2008 cache->mfc_un.res.last_assert = jiffies;
2009 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2010 }
2011 goto dont_forward;
2012 }
2013
2014 mrt->vif6_table[vif].pkt_in++;
2015 mrt->vif6_table[vif].bytes_in += skb->len;
2016
2017 /*
2018 * Forward the frame
2019 */
2020 for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
2021 if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
2022 if (psend != -1) {
2023 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2024 if (skb2)
2025 ip6mr_forward2(net, mrt, skb2, cache, psend);
2026 }
2027 psend = ct;
2028 }
2029 }
2030 if (psend != -1) {
2031 ip6mr_forward2(net, mrt, skb, cache, psend);
2032 return 0;
2033 }
2034
2035dont_forward:
2036 kfree_skb(skb);
2037 return 0;
2038}
2039
2040
2041/*
2042 * Multicast packets for forwarding arrive here
2043 */
2044
2045int ip6_mr_input(struct sk_buff *skb)
2046{
2047 struct mfc6_cache *cache;
2048 struct net *net = dev_net(skb->dev);
2049 struct mr6_table *mrt;
2050 struct flowi6 fl6 = {
2051 .flowi6_iif = skb->dev->ifindex,
2052 .flowi6_mark = skb->mark,
2053 };
2054 int err;
2055
2056 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2057 if (err < 0) {
2058 kfree_skb(skb);
2059 return err;
2060 }
2061
2062 read_lock(&mrt_lock);
2063 cache = ip6mr_cache_find(mrt,
2064 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2065
2066 /*
2067 * No usable cache entry
2068 */
2069 if (cache == NULL) {
2070 int vif;
2071
2072 vif = ip6mr_find_vif(mrt, skb->dev);
2073 if (vif >= 0) {
2074 int err = ip6mr_cache_unresolved(mrt, vif, skb);
2075 read_unlock(&mrt_lock);
2076
2077 return err;
2078 }
2079 read_unlock(&mrt_lock);
2080 kfree_skb(skb);
2081 return -ENODEV;
2082 }
2083
2084 ip6_mr_forward(net, mrt, skb, cache);
2085
2086 read_unlock(&mrt_lock);
2087
2088 return 0;
2089}
2090
2091
2092static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2093 struct mfc6_cache *c, struct rtmsg *rtm)
2094{
2095 int ct;
2096 struct rtnexthop *nhp;
2097 u8 *b = skb_tail_pointer(skb);
2098 struct rtattr *mp_head;
2099
2100 /* If cache is unresolved, don't try to parse IIF and OIF */
2101 if (c->mf6c_parent >= MAXMIFS)
2102 return -ENOENT;
2103
2104 if (MIF_EXISTS(mrt, c->mf6c_parent))
2105 RTA_PUT(skb, RTA_IIF, 4, &mrt->vif6_table[c->mf6c_parent].dev->ifindex);
2106
2107 mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0));
2108
2109 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2110 if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2111 if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
2112 goto rtattr_failure;
2113 nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
2114 nhp->rtnh_flags = 0;
2115 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2116 nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex;
2117 nhp->rtnh_len = sizeof(*nhp);
2118 }
2119 }
2120 mp_head->rta_type = RTA_MULTIPATH;
2121 mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head;
2122 rtm->rtm_type = RTN_MULTICAST;
2123 return 1;
2124
2125rtattr_failure:
2126 nlmsg_trim(skb, b);
2127 return -EMSGSIZE;
2128}
2129
2130int ip6mr_get_route(struct net *net,
2131 struct sk_buff *skb, struct rtmsg *rtm, int nowait)
2132{
2133 int err;
2134 struct mr6_table *mrt;
2135 struct mfc6_cache *cache;
2136 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
2137
2138 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2139 if (mrt == NULL)
2140 return -ENOENT;
2141
2142 read_lock(&mrt_lock);
2143 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2144
2145 if (!cache) {
2146 struct sk_buff *skb2;
2147 struct ipv6hdr *iph;
2148 struct net_device *dev;
2149 int vif;
2150
2151 if (nowait) {
2152 read_unlock(&mrt_lock);
2153 return -EAGAIN;
2154 }
2155
2156 dev = skb->dev;
2157 if (dev == NULL || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2158 read_unlock(&mrt_lock);
2159 return -ENODEV;
2160 }
2161
2162 /* really correct? */
2163 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2164 if (!skb2) {
2165 read_unlock(&mrt_lock);
2166 return -ENOMEM;
2167 }
2168
2169 skb_reset_transport_header(skb2);
2170
2171 skb_put(skb2, sizeof(struct ipv6hdr));
2172 skb_reset_network_header(skb2);
2173
2174 iph = ipv6_hdr(skb2);
2175 iph->version = 0;
2176 iph->priority = 0;
2177 iph->flow_lbl[0] = 0;
2178 iph->flow_lbl[1] = 0;
2179 iph->flow_lbl[2] = 0;
2180 iph->payload_len = 0;
2181 iph->nexthdr = IPPROTO_NONE;
2182 iph->hop_limit = 0;
2183 ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr);
2184 ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr);
2185
2186 err = ip6mr_cache_unresolved(mrt, vif, skb2);
2187 read_unlock(&mrt_lock);
2188
2189 return err;
2190 }
2191
2192 if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
2193 cache->mfc_flags |= MFC_NOTIFY;
2194
2195 err = __ip6mr_fill_mroute(mrt, skb, cache, rtm);
2196 read_unlock(&mrt_lock);
2197 return err;
2198}
2199
2200static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2201 u32 pid, u32 seq, struct mfc6_cache *c)
2202{
2203 struct nlmsghdr *nlh;
2204 struct rtmsg *rtm;
2205
2206 nlh = nlmsg_put(skb, pid, seq, RTM_NEWROUTE, sizeof(*rtm), NLM_F_MULTI);
2207 if (nlh == NULL)
2208 return -EMSGSIZE;
2209
2210 rtm = nlmsg_data(nlh);
2211 rtm->rtm_family = RTNL_FAMILY_IPMR;
2212 rtm->rtm_dst_len = 128;
2213 rtm->rtm_src_len = 128;
2214 rtm->rtm_tos = 0;
2215 rtm->rtm_table = mrt->id;
2216 NLA_PUT_U32(skb, RTA_TABLE, mrt->id);
2217 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2218 rtm->rtm_protocol = RTPROT_UNSPEC;
2219 rtm->rtm_flags = 0;
2220
2221 NLA_PUT(skb, RTA_SRC, 16, &c->mf6c_origin);
2222 NLA_PUT(skb, RTA_DST, 16, &c->mf6c_mcastgrp);
2223
2224 if (__ip6mr_fill_mroute(mrt, skb, c, rtm) < 0)
2225 goto nla_put_failure;
2226
2227 return nlmsg_end(skb, nlh);
2228
2229nla_put_failure:
2230 nlmsg_cancel(skb, nlh);
2231 return -EMSGSIZE;
2232}
2233
2234static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2235{
2236 struct net *net = sock_net(skb->sk);
2237 struct mr6_table *mrt;
2238 struct mfc6_cache *mfc;
2239 unsigned int t = 0, s_t;
2240 unsigned int h = 0, s_h;
2241 unsigned int e = 0, s_e;
2242
2243 s_t = cb->args[0];
2244 s_h = cb->args[1];
2245 s_e = cb->args[2];
2246
2247 read_lock(&mrt_lock);
2248 ip6mr_for_each_table(mrt, net) {
2249 if (t < s_t)
2250 goto next_table;
2251 if (t > s_t)
2252 s_h = 0;
2253 for (h = s_h; h < MFC6_LINES; h++) {
2254 list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) {
2255 if (e < s_e)
2256 goto next_entry;
2257 if (ip6mr_fill_mroute(mrt, skb,
2258 NETLINK_CB(cb->skb).pid,
2259 cb->nlh->nlmsg_seq,
2260 mfc) < 0)
2261 goto done;
2262next_entry:
2263 e++;
2264 }
2265 e = s_e = 0;
2266 }
2267 s_h = 0;
2268next_table:
2269 t++;
2270 }
2271done:
2272 read_unlock(&mrt_lock);
2273
2274 cb->args[2] = e;
2275 cb->args[1] = h;
2276 cb->args[0] = t;
2277
2278 return skb->len;
2279}
1// 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 lockdep_rtnl_is_held() || \
102 list_empty(&net->ipv6.mr6_tables))
103
104static struct mr_table *ip6mr_mr_table_iter(struct net *net,
105 struct mr_table *mrt)
106{
107 struct mr_table *ret;
108
109 if (!mrt)
110 ret = list_entry_rcu(net->ipv6.mr6_tables.next,
111 struct mr_table, list);
112 else
113 ret = list_entry_rcu(mrt->list.next,
114 struct mr_table, list);
115
116 if (&ret->list == &net->ipv6.mr6_tables)
117 return NULL;
118 return ret;
119}
120
121static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
122{
123 struct mr_table *mrt;
124
125 ip6mr_for_each_table(mrt, net) {
126 if (mrt->id == id)
127 return mrt;
128 }
129 return NULL;
130}
131
132static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
133 struct mr_table **mrt)
134{
135 int err;
136 struct ip6mr_result res;
137 struct fib_lookup_arg arg = {
138 .result = &res,
139 .flags = FIB_LOOKUP_NOREF,
140 };
141
142 /* update flow if oif or iif point to device enslaved to l3mdev */
143 l3mdev_update_flow(net, flowi6_to_flowi(flp6));
144
145 err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
146 flowi6_to_flowi(flp6), 0, &arg);
147 if (err < 0)
148 return err;
149 *mrt = res.mrt;
150 return 0;
151}
152
153static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
154 int flags, struct fib_lookup_arg *arg)
155{
156 struct ip6mr_result *res = arg->result;
157 struct mr_table *mrt;
158
159 switch (rule->action) {
160 case FR_ACT_TO_TBL:
161 break;
162 case FR_ACT_UNREACHABLE:
163 return -ENETUNREACH;
164 case FR_ACT_PROHIBIT:
165 return -EACCES;
166 case FR_ACT_BLACKHOLE:
167 default:
168 return -EINVAL;
169 }
170
171 arg->table = fib_rule_get_table(rule, arg);
172
173 mrt = ip6mr_get_table(rule->fr_net, arg->table);
174 if (!mrt)
175 return -EAGAIN;
176 res->mrt = mrt;
177 return 0;
178}
179
180static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
181{
182 return 1;
183}
184
185static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = {
186 FRA_GENERIC_POLICY,
187};
188
189static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
190 struct fib_rule_hdr *frh, struct nlattr **tb,
191 struct netlink_ext_ack *extack)
192{
193 return 0;
194}
195
196static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
197 struct nlattr **tb)
198{
199 return 1;
200}
201
202static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
203 struct fib_rule_hdr *frh)
204{
205 frh->dst_len = 0;
206 frh->src_len = 0;
207 frh->tos = 0;
208 return 0;
209}
210
211static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
212 .family = RTNL_FAMILY_IP6MR,
213 .rule_size = sizeof(struct ip6mr_rule),
214 .addr_size = sizeof(struct in6_addr),
215 .action = ip6mr_rule_action,
216 .match = ip6mr_rule_match,
217 .configure = ip6mr_rule_configure,
218 .compare = ip6mr_rule_compare,
219 .fill = ip6mr_rule_fill,
220 .nlgroup = RTNLGRP_IPV6_RULE,
221 .policy = ip6mr_rule_policy,
222 .owner = THIS_MODULE,
223};
224
225static int __net_init ip6mr_rules_init(struct net *net)
226{
227 struct fib_rules_ops *ops;
228 struct mr_table *mrt;
229 int err;
230
231 ops = fib_rules_register(&ip6mr_rules_ops_template, net);
232 if (IS_ERR(ops))
233 return PTR_ERR(ops);
234
235 INIT_LIST_HEAD(&net->ipv6.mr6_tables);
236
237 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
238 if (IS_ERR(mrt)) {
239 err = PTR_ERR(mrt);
240 goto err1;
241 }
242
243 err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
244 if (err < 0)
245 goto err2;
246
247 net->ipv6.mr6_rules_ops = ops;
248 return 0;
249
250err2:
251 ip6mr_free_table(mrt);
252err1:
253 fib_rules_unregister(ops);
254 return err;
255}
256
257static void __net_exit ip6mr_rules_exit(struct net *net)
258{
259 struct mr_table *mrt, *next;
260
261 rtnl_lock();
262 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
263 list_del(&mrt->list);
264 ip6mr_free_table(mrt);
265 }
266 fib_rules_unregister(net->ipv6.mr6_rules_ops);
267 rtnl_unlock();
268}
269
270static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb,
271 struct netlink_ext_ack *extack)
272{
273 return fib_rules_dump(net, nb, RTNL_FAMILY_IP6MR, extack);
274}
275
276static unsigned int ip6mr_rules_seq_read(struct net *net)
277{
278 return fib_rules_seq_read(net, RTNL_FAMILY_IP6MR);
279}
280
281bool ip6mr_rule_default(const struct fib_rule *rule)
282{
283 return fib_rule_matchall(rule) && rule->action == FR_ACT_TO_TBL &&
284 rule->table == RT6_TABLE_DFLT && !rule->l3mdev;
285}
286EXPORT_SYMBOL(ip6mr_rule_default);
287#else
288#define ip6mr_for_each_table(mrt, net) \
289 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
290
291static struct mr_table *ip6mr_mr_table_iter(struct net *net,
292 struct mr_table *mrt)
293{
294 if (!mrt)
295 return net->ipv6.mrt6;
296 return NULL;
297}
298
299static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
300{
301 return net->ipv6.mrt6;
302}
303
304static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
305 struct mr_table **mrt)
306{
307 *mrt = net->ipv6.mrt6;
308 return 0;
309}
310
311static int __net_init ip6mr_rules_init(struct net *net)
312{
313 struct mr_table *mrt;
314
315 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
316 if (IS_ERR(mrt))
317 return PTR_ERR(mrt);
318 net->ipv6.mrt6 = mrt;
319 return 0;
320}
321
322static void __net_exit ip6mr_rules_exit(struct net *net)
323{
324 rtnl_lock();
325 ip6mr_free_table(net->ipv6.mrt6);
326 net->ipv6.mrt6 = NULL;
327 rtnl_unlock();
328}
329
330static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb,
331 struct netlink_ext_ack *extack)
332{
333 return 0;
334}
335
336static unsigned int ip6mr_rules_seq_read(struct net *net)
337{
338 return 0;
339}
340#endif
341
342static int ip6mr_hash_cmp(struct rhashtable_compare_arg *arg,
343 const void *ptr)
344{
345 const struct mfc6_cache_cmp_arg *cmparg = arg->key;
346 struct mfc6_cache *c = (struct mfc6_cache *)ptr;
347
348 return !ipv6_addr_equal(&c->mf6c_mcastgrp, &cmparg->mf6c_mcastgrp) ||
349 !ipv6_addr_equal(&c->mf6c_origin, &cmparg->mf6c_origin);
350}
351
352static const struct rhashtable_params ip6mr_rht_params = {
353 .head_offset = offsetof(struct mr_mfc, mnode),
354 .key_offset = offsetof(struct mfc6_cache, cmparg),
355 .key_len = sizeof(struct mfc6_cache_cmp_arg),
356 .nelem_hint = 3,
357 .obj_cmpfn = ip6mr_hash_cmp,
358 .automatic_shrinking = true,
359};
360
361static void ip6mr_new_table_set(struct mr_table *mrt,
362 struct net *net)
363{
364#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
365 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
366#endif
367}
368
369static struct mfc6_cache_cmp_arg ip6mr_mr_table_ops_cmparg_any = {
370 .mf6c_origin = IN6ADDR_ANY_INIT,
371 .mf6c_mcastgrp = IN6ADDR_ANY_INIT,
372};
373
374static struct mr_table_ops ip6mr_mr_table_ops = {
375 .rht_params = &ip6mr_rht_params,
376 .cmparg_any = &ip6mr_mr_table_ops_cmparg_any,
377};
378
379static struct mr_table *ip6mr_new_table(struct net *net, u32 id)
380{
381 struct mr_table *mrt;
382
383 mrt = ip6mr_get_table(net, id);
384 if (mrt)
385 return mrt;
386
387 return mr_table_alloc(net, id, &ip6mr_mr_table_ops,
388 ipmr_expire_process, ip6mr_new_table_set);
389}
390
391static void ip6mr_free_table(struct mr_table *mrt)
392{
393 del_timer_sync(&mrt->ipmr_expire_timer);
394 mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC |
395 MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC);
396 rhltable_destroy(&mrt->mfc_hash);
397 kfree(mrt);
398}
399
400#ifdef CONFIG_PROC_FS
401/* The /proc interfaces to multicast routing
402 * /proc/ip6_mr_cache /proc/ip6_mr_vif
403 */
404
405static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
406 __acquires(mrt_lock)
407{
408 struct mr_vif_iter *iter = seq->private;
409 struct net *net = seq_file_net(seq);
410 struct mr_table *mrt;
411
412 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
413 if (!mrt)
414 return ERR_PTR(-ENOENT);
415
416 iter->mrt = mrt;
417
418 read_lock(&mrt_lock);
419 return mr_vif_seq_start(seq, pos);
420}
421
422static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
423 __releases(mrt_lock)
424{
425 read_unlock(&mrt_lock);
426}
427
428static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
429{
430 struct mr_vif_iter *iter = seq->private;
431 struct mr_table *mrt = iter->mrt;
432
433 if (v == SEQ_START_TOKEN) {
434 seq_puts(seq,
435 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
436 } else {
437 const struct vif_device *vif = v;
438 const char *name = vif->dev ? vif->dev->name : "none";
439
440 seq_printf(seq,
441 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
442 vif - mrt->vif_table,
443 name, vif->bytes_in, vif->pkt_in,
444 vif->bytes_out, vif->pkt_out,
445 vif->flags);
446 }
447 return 0;
448}
449
450static const struct seq_operations ip6mr_vif_seq_ops = {
451 .start = ip6mr_vif_seq_start,
452 .next = mr_vif_seq_next,
453 .stop = ip6mr_vif_seq_stop,
454 .show = ip6mr_vif_seq_show,
455};
456
457static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
458{
459 struct net *net = seq_file_net(seq);
460 struct mr_table *mrt;
461
462 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
463 if (!mrt)
464 return ERR_PTR(-ENOENT);
465
466 return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
467}
468
469static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
470{
471 int n;
472
473 if (v == SEQ_START_TOKEN) {
474 seq_puts(seq,
475 "Group "
476 "Origin "
477 "Iif Pkts Bytes Wrong Oifs\n");
478 } else {
479 const struct mfc6_cache *mfc = v;
480 const struct mr_mfc_iter *it = seq->private;
481 struct mr_table *mrt = it->mrt;
482
483 seq_printf(seq, "%pI6 %pI6 %-3hd",
484 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
485 mfc->_c.mfc_parent);
486
487 if (it->cache != &mrt->mfc_unres_queue) {
488 seq_printf(seq, " %8lu %8lu %8lu",
489 mfc->_c.mfc_un.res.pkt,
490 mfc->_c.mfc_un.res.bytes,
491 mfc->_c.mfc_un.res.wrong_if);
492 for (n = mfc->_c.mfc_un.res.minvif;
493 n < mfc->_c.mfc_un.res.maxvif; n++) {
494 if (VIF_EXISTS(mrt, n) &&
495 mfc->_c.mfc_un.res.ttls[n] < 255)
496 seq_printf(seq,
497 " %2d:%-3d", n,
498 mfc->_c.mfc_un.res.ttls[n]);
499 }
500 } else {
501 /* unresolved mfc_caches don't contain
502 * pkt, bytes and wrong_if values
503 */
504 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
505 }
506 seq_putc(seq, '\n');
507 }
508 return 0;
509}
510
511static const struct seq_operations ipmr_mfc_seq_ops = {
512 .start = ipmr_mfc_seq_start,
513 .next = mr_mfc_seq_next,
514 .stop = mr_mfc_seq_stop,
515 .show = ipmr_mfc_seq_show,
516};
517#endif
518
519#ifdef CONFIG_IPV6_PIMSM_V2
520
521static int pim6_rcv(struct sk_buff *skb)
522{
523 struct pimreghdr *pim;
524 struct ipv6hdr *encap;
525 struct net_device *reg_dev = NULL;
526 struct net *net = dev_net(skb->dev);
527 struct mr_table *mrt;
528 struct flowi6 fl6 = {
529 .flowi6_iif = skb->dev->ifindex,
530 .flowi6_mark = skb->mark,
531 };
532 int reg_vif_num;
533
534 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
535 goto drop;
536
537 pim = (struct pimreghdr *)skb_transport_header(skb);
538 if (pim->type != ((PIM_VERSION << 4) | PIM_TYPE_REGISTER) ||
539 (pim->flags & PIM_NULL_REGISTER) ||
540 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
541 sizeof(*pim), IPPROTO_PIM,
542 csum_partial((void *)pim, sizeof(*pim), 0)) &&
543 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
544 goto drop;
545
546 /* check if the inner packet is destined to mcast group */
547 encap = (struct ipv6hdr *)(skb_transport_header(skb) +
548 sizeof(*pim));
549
550 if (!ipv6_addr_is_multicast(&encap->daddr) ||
551 encap->payload_len == 0 ||
552 ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
553 goto drop;
554
555 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
556 goto drop;
557 reg_vif_num = mrt->mroute_reg_vif_num;
558
559 read_lock(&mrt_lock);
560 if (reg_vif_num >= 0)
561 reg_dev = mrt->vif_table[reg_vif_num].dev;
562 if (reg_dev)
563 dev_hold(reg_dev);
564 read_unlock(&mrt_lock);
565
566 if (!reg_dev)
567 goto drop;
568
569 skb->mac_header = skb->network_header;
570 skb_pull(skb, (u8 *)encap - skb->data);
571 skb_reset_network_header(skb);
572 skb->protocol = htons(ETH_P_IPV6);
573 skb->ip_summed = CHECKSUM_NONE;
574
575 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
576
577 netif_rx(skb);
578
579 dev_put(reg_dev);
580 return 0;
581 drop:
582 kfree_skb(skb);
583 return 0;
584}
585
586static const struct inet6_protocol pim6_protocol = {
587 .handler = pim6_rcv,
588};
589
590/* Service routines creating virtual interfaces: PIMREG */
591
592static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
593 struct net_device *dev)
594{
595 struct net *net = dev_net(dev);
596 struct mr_table *mrt;
597 struct flowi6 fl6 = {
598 .flowi6_oif = dev->ifindex,
599 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
600 .flowi6_mark = skb->mark,
601 };
602
603 if (!pskb_inet_may_pull(skb))
604 goto tx_err;
605
606 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
607 goto tx_err;
608
609 read_lock(&mrt_lock);
610 dev->stats.tx_bytes += skb->len;
611 dev->stats.tx_packets++;
612 ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
613 read_unlock(&mrt_lock);
614 kfree_skb(skb);
615 return NETDEV_TX_OK;
616
617tx_err:
618 dev->stats.tx_errors++;
619 kfree_skb(skb);
620 return NETDEV_TX_OK;
621}
622
623static int reg_vif_get_iflink(const struct net_device *dev)
624{
625 return 0;
626}
627
628static const struct net_device_ops reg_vif_netdev_ops = {
629 .ndo_start_xmit = reg_vif_xmit,
630 .ndo_get_iflink = reg_vif_get_iflink,
631};
632
633static void reg_vif_setup(struct net_device *dev)
634{
635 dev->type = ARPHRD_PIMREG;
636 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
637 dev->flags = IFF_NOARP;
638 dev->netdev_ops = ®_vif_netdev_ops;
639 dev->needs_free_netdev = true;
640 dev->features |= NETIF_F_NETNS_LOCAL;
641}
642
643static struct net_device *ip6mr_reg_vif(struct net *net, struct mr_table *mrt)
644{
645 struct net_device *dev;
646 char name[IFNAMSIZ];
647
648 if (mrt->id == RT6_TABLE_DFLT)
649 sprintf(name, "pim6reg");
650 else
651 sprintf(name, "pim6reg%u", mrt->id);
652
653 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
654 if (!dev)
655 return NULL;
656
657 dev_net_set(dev, net);
658
659 if (register_netdevice(dev)) {
660 free_netdev(dev);
661 return NULL;
662 }
663
664 if (dev_open(dev, NULL))
665 goto failure;
666
667 dev_hold(dev);
668 return dev;
669
670failure:
671 unregister_netdevice(dev);
672 return NULL;
673}
674#endif
675
676static int call_ip6mr_vif_entry_notifiers(struct net *net,
677 enum fib_event_type event_type,
678 struct vif_device *vif,
679 mifi_t vif_index, u32 tb_id)
680{
681 return mr_call_vif_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
682 vif, vif_index, tb_id,
683 &net->ipv6.ipmr_seq);
684}
685
686static int call_ip6mr_mfc_entry_notifiers(struct net *net,
687 enum fib_event_type event_type,
688 struct mfc6_cache *mfc, u32 tb_id)
689{
690 return mr_call_mfc_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
691 &mfc->_c, tb_id, &net->ipv6.ipmr_seq);
692}
693
694/* Delete a VIF entry */
695static int mif6_delete(struct mr_table *mrt, int vifi, int notify,
696 struct list_head *head)
697{
698 struct vif_device *v;
699 struct net_device *dev;
700 struct inet6_dev *in6_dev;
701
702 if (vifi < 0 || vifi >= mrt->maxvif)
703 return -EADDRNOTAVAIL;
704
705 v = &mrt->vif_table[vifi];
706
707 if (VIF_EXISTS(mrt, vifi))
708 call_ip6mr_vif_entry_notifiers(read_pnet(&mrt->net),
709 FIB_EVENT_VIF_DEL, v, vifi,
710 mrt->id);
711
712 write_lock_bh(&mrt_lock);
713 dev = v->dev;
714 v->dev = NULL;
715
716 if (!dev) {
717 write_unlock_bh(&mrt_lock);
718 return -EADDRNOTAVAIL;
719 }
720
721#ifdef CONFIG_IPV6_PIMSM_V2
722 if (vifi == mrt->mroute_reg_vif_num)
723 mrt->mroute_reg_vif_num = -1;
724#endif
725
726 if (vifi + 1 == mrt->maxvif) {
727 int tmp;
728 for (tmp = vifi - 1; tmp >= 0; tmp--) {
729 if (VIF_EXISTS(mrt, tmp))
730 break;
731 }
732 mrt->maxvif = tmp + 1;
733 }
734
735 write_unlock_bh(&mrt_lock);
736
737 dev_set_allmulti(dev, -1);
738
739 in6_dev = __in6_dev_get(dev);
740 if (in6_dev) {
741 in6_dev->cnf.mc_forwarding--;
742 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
743 NETCONFA_MC_FORWARDING,
744 dev->ifindex, &in6_dev->cnf);
745 }
746
747 if ((v->flags & MIFF_REGISTER) && !notify)
748 unregister_netdevice_queue(dev, head);
749
750 dev_put(dev);
751 return 0;
752}
753
754static inline void ip6mr_cache_free_rcu(struct rcu_head *head)
755{
756 struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
757
758 kmem_cache_free(mrt_cachep, (struct mfc6_cache *)c);
759}
760
761static inline void ip6mr_cache_free(struct mfc6_cache *c)
762{
763 call_rcu(&c->_c.rcu, ip6mr_cache_free_rcu);
764}
765
766/* Destroy an unresolved cache entry, killing queued skbs
767 and reporting error to netlink readers.
768 */
769
770static void ip6mr_destroy_unres(struct mr_table *mrt, struct mfc6_cache *c)
771{
772 struct net *net = read_pnet(&mrt->net);
773 struct sk_buff *skb;
774
775 atomic_dec(&mrt->cache_resolve_queue_len);
776
777 while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved)) != NULL) {
778 if (ipv6_hdr(skb)->version == 0) {
779 struct nlmsghdr *nlh = skb_pull(skb,
780 sizeof(struct ipv6hdr));
781 nlh->nlmsg_type = NLMSG_ERROR;
782 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
783 skb_trim(skb, nlh->nlmsg_len);
784 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
785 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
786 } else
787 kfree_skb(skb);
788 }
789
790 ip6mr_cache_free(c);
791}
792
793
794/* Timer process for all the unresolved queue. */
795
796static void ipmr_do_expire_process(struct mr_table *mrt)
797{
798 unsigned long now = jiffies;
799 unsigned long expires = 10 * HZ;
800 struct mr_mfc *c, *next;
801
802 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
803 if (time_after(c->mfc_un.unres.expires, now)) {
804 /* not yet... */
805 unsigned long interval = c->mfc_un.unres.expires - now;
806 if (interval < expires)
807 expires = interval;
808 continue;
809 }
810
811 list_del(&c->list);
812 mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
813 ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
814 }
815
816 if (!list_empty(&mrt->mfc_unres_queue))
817 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
818}
819
820static void ipmr_expire_process(struct timer_list *t)
821{
822 struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
823
824 if (!spin_trylock(&mfc_unres_lock)) {
825 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
826 return;
827 }
828
829 if (!list_empty(&mrt->mfc_unres_queue))
830 ipmr_do_expire_process(mrt);
831
832 spin_unlock(&mfc_unres_lock);
833}
834
835/* Fill oifs list. It is called under write locked mrt_lock. */
836
837static void ip6mr_update_thresholds(struct mr_table *mrt,
838 struct mr_mfc *cache,
839 unsigned char *ttls)
840{
841 int vifi;
842
843 cache->mfc_un.res.minvif = MAXMIFS;
844 cache->mfc_un.res.maxvif = 0;
845 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
846
847 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
848 if (VIF_EXISTS(mrt, vifi) &&
849 ttls[vifi] && ttls[vifi] < 255) {
850 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
851 if (cache->mfc_un.res.minvif > vifi)
852 cache->mfc_un.res.minvif = vifi;
853 if (cache->mfc_un.res.maxvif <= vifi)
854 cache->mfc_un.res.maxvif = vifi + 1;
855 }
856 }
857 cache->mfc_un.res.lastuse = jiffies;
858}
859
860static int mif6_add(struct net *net, struct mr_table *mrt,
861 struct mif6ctl *vifc, int mrtsock)
862{
863 int vifi = vifc->mif6c_mifi;
864 struct vif_device *v = &mrt->vif_table[vifi];
865 struct net_device *dev;
866 struct inet6_dev *in6_dev;
867 int err;
868
869 /* Is vif busy ? */
870 if (VIF_EXISTS(mrt, vifi))
871 return -EADDRINUSE;
872
873 switch (vifc->mif6c_flags) {
874#ifdef CONFIG_IPV6_PIMSM_V2
875 case MIFF_REGISTER:
876 /*
877 * Special Purpose VIF in PIM
878 * All the packets will be sent to the daemon
879 */
880 if (mrt->mroute_reg_vif_num >= 0)
881 return -EADDRINUSE;
882 dev = ip6mr_reg_vif(net, mrt);
883 if (!dev)
884 return -ENOBUFS;
885 err = dev_set_allmulti(dev, 1);
886 if (err) {
887 unregister_netdevice(dev);
888 dev_put(dev);
889 return err;
890 }
891 break;
892#endif
893 case 0:
894 dev = dev_get_by_index(net, vifc->mif6c_pifi);
895 if (!dev)
896 return -EADDRNOTAVAIL;
897 err = dev_set_allmulti(dev, 1);
898 if (err) {
899 dev_put(dev);
900 return err;
901 }
902 break;
903 default:
904 return -EINVAL;
905 }
906
907 in6_dev = __in6_dev_get(dev);
908 if (in6_dev) {
909 in6_dev->cnf.mc_forwarding++;
910 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
911 NETCONFA_MC_FORWARDING,
912 dev->ifindex, &in6_dev->cnf);
913 }
914
915 /* Fill in the VIF structures */
916 vif_device_init(v, dev, vifc->vifc_rate_limit, vifc->vifc_threshold,
917 vifc->mif6c_flags | (!mrtsock ? VIFF_STATIC : 0),
918 MIFF_REGISTER);
919
920 /* And finish update writing critical data */
921 write_lock_bh(&mrt_lock);
922 v->dev = dev;
923#ifdef CONFIG_IPV6_PIMSM_V2
924 if (v->flags & MIFF_REGISTER)
925 mrt->mroute_reg_vif_num = vifi;
926#endif
927 if (vifi + 1 > mrt->maxvif)
928 mrt->maxvif = vifi + 1;
929 write_unlock_bh(&mrt_lock);
930 call_ip6mr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD,
931 v, vifi, mrt->id);
932 return 0;
933}
934
935static struct mfc6_cache *ip6mr_cache_find(struct mr_table *mrt,
936 const struct in6_addr *origin,
937 const struct in6_addr *mcastgrp)
938{
939 struct mfc6_cache_cmp_arg arg = {
940 .mf6c_origin = *origin,
941 .mf6c_mcastgrp = *mcastgrp,
942 };
943
944 return mr_mfc_find(mrt, &arg);
945}
946
947/* Look for a (*,G) entry */
948static struct mfc6_cache *ip6mr_cache_find_any(struct mr_table *mrt,
949 struct in6_addr *mcastgrp,
950 mifi_t mifi)
951{
952 struct mfc6_cache_cmp_arg arg = {
953 .mf6c_origin = in6addr_any,
954 .mf6c_mcastgrp = *mcastgrp,
955 };
956
957 if (ipv6_addr_any(mcastgrp))
958 return mr_mfc_find_any_parent(mrt, mifi);
959 return mr_mfc_find_any(mrt, mifi, &arg);
960}
961
962/* Look for a (S,G,iif) entry if parent != -1 */
963static struct mfc6_cache *
964ip6mr_cache_find_parent(struct mr_table *mrt,
965 const struct in6_addr *origin,
966 const struct in6_addr *mcastgrp,
967 int parent)
968{
969 struct mfc6_cache_cmp_arg arg = {
970 .mf6c_origin = *origin,
971 .mf6c_mcastgrp = *mcastgrp,
972 };
973
974 return mr_mfc_find_parent(mrt, &arg, parent);
975}
976
977/* Allocate a multicast cache entry */
978static struct mfc6_cache *ip6mr_cache_alloc(void)
979{
980 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
981 if (!c)
982 return NULL;
983 c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
984 c->_c.mfc_un.res.minvif = MAXMIFS;
985 c->_c.free = ip6mr_cache_free_rcu;
986 refcount_set(&c->_c.mfc_un.res.refcount, 1);
987 return c;
988}
989
990static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
991{
992 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
993 if (!c)
994 return NULL;
995 skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
996 c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
997 return c;
998}
999
1000/*
1001 * A cache entry has gone into a resolved state from queued
1002 */
1003
1004static void ip6mr_cache_resolve(struct net *net, struct mr_table *mrt,
1005 struct mfc6_cache *uc, struct mfc6_cache *c)
1006{
1007 struct sk_buff *skb;
1008
1009 /*
1010 * Play the pending entries through our router
1011 */
1012
1013 while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
1014 if (ipv6_hdr(skb)->version == 0) {
1015 struct nlmsghdr *nlh = skb_pull(skb,
1016 sizeof(struct ipv6hdr));
1017
1018 if (mr_fill_mroute(mrt, skb, &c->_c,
1019 nlmsg_data(nlh)) > 0) {
1020 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1021 } else {
1022 nlh->nlmsg_type = NLMSG_ERROR;
1023 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1024 skb_trim(skb, nlh->nlmsg_len);
1025 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
1026 }
1027 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1028 } else
1029 ip6_mr_forward(net, mrt, skb->dev, skb, c);
1030 }
1031}
1032
1033/*
1034 * Bounce a cache query up to pim6sd and netlink.
1035 *
1036 * Called under mrt_lock.
1037 */
1038
1039static int ip6mr_cache_report(struct mr_table *mrt, struct sk_buff *pkt,
1040 mifi_t mifi, int assert)
1041{
1042 struct sock *mroute6_sk;
1043 struct sk_buff *skb;
1044 struct mrt6msg *msg;
1045 int ret;
1046
1047#ifdef CONFIG_IPV6_PIMSM_V2
1048 if (assert == MRT6MSG_WHOLEPKT)
1049 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1050 +sizeof(*msg));
1051 else
1052#endif
1053 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1054
1055 if (!skb)
1056 return -ENOBUFS;
1057
1058 /* I suppose that internal messages
1059 * do not require checksums */
1060
1061 skb->ip_summed = CHECKSUM_UNNECESSARY;
1062
1063#ifdef CONFIG_IPV6_PIMSM_V2
1064 if (assert == MRT6MSG_WHOLEPKT) {
1065 /* Ugly, but we have no choice with this interface.
1066 Duplicate old header, fix length etc.
1067 And all this only to mangle msg->im6_msgtype and
1068 to set msg->im6_mbz to "mbz" :-)
1069 */
1070 skb_push(skb, -skb_network_offset(pkt));
1071
1072 skb_push(skb, sizeof(*msg));
1073 skb_reset_transport_header(skb);
1074 msg = (struct mrt6msg *)skb_transport_header(skb);
1075 msg->im6_mbz = 0;
1076 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
1077 msg->im6_mif = mrt->mroute_reg_vif_num;
1078 msg->im6_pad = 0;
1079 msg->im6_src = ipv6_hdr(pkt)->saddr;
1080 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1081
1082 skb->ip_summed = CHECKSUM_UNNECESSARY;
1083 } else
1084#endif
1085 {
1086 /*
1087 * Copy the IP header
1088 */
1089
1090 skb_put(skb, sizeof(struct ipv6hdr));
1091 skb_reset_network_header(skb);
1092 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1093
1094 /*
1095 * Add our header
1096 */
1097 skb_put(skb, sizeof(*msg));
1098 skb_reset_transport_header(skb);
1099 msg = (struct mrt6msg *)skb_transport_header(skb);
1100
1101 msg->im6_mbz = 0;
1102 msg->im6_msgtype = assert;
1103 msg->im6_mif = mifi;
1104 msg->im6_pad = 0;
1105 msg->im6_src = ipv6_hdr(pkt)->saddr;
1106 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1107
1108 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1109 skb->ip_summed = CHECKSUM_UNNECESSARY;
1110 }
1111
1112 rcu_read_lock();
1113 mroute6_sk = rcu_dereference(mrt->mroute_sk);
1114 if (!mroute6_sk) {
1115 rcu_read_unlock();
1116 kfree_skb(skb);
1117 return -EINVAL;
1118 }
1119
1120 mrt6msg_netlink_event(mrt, skb);
1121
1122 /* Deliver to user space multicast routing algorithms */
1123 ret = sock_queue_rcv_skb(mroute6_sk, skb);
1124 rcu_read_unlock();
1125 if (ret < 0) {
1126 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
1127 kfree_skb(skb);
1128 }
1129
1130 return ret;
1131}
1132
1133/* Queue a packet for resolution. It gets locked cache entry! */
1134static int ip6mr_cache_unresolved(struct mr_table *mrt, mifi_t mifi,
1135 struct sk_buff *skb, struct net_device *dev)
1136{
1137 struct mfc6_cache *c;
1138 bool found = false;
1139 int err;
1140
1141 spin_lock_bh(&mfc_unres_lock);
1142 list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
1143 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1144 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1145 found = true;
1146 break;
1147 }
1148 }
1149
1150 if (!found) {
1151 /*
1152 * Create a new entry if allowable
1153 */
1154
1155 c = ip6mr_cache_alloc_unres();
1156 if (!c) {
1157 spin_unlock_bh(&mfc_unres_lock);
1158
1159 kfree_skb(skb);
1160 return -ENOBUFS;
1161 }
1162
1163 /* Fill in the new cache entry */
1164 c->_c.mfc_parent = -1;
1165 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1166 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1167
1168 /*
1169 * Reflect first query at pim6sd
1170 */
1171 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1172 if (err < 0) {
1173 /* If the report failed throw the cache entry
1174 out - Brad Parker
1175 */
1176 spin_unlock_bh(&mfc_unres_lock);
1177
1178 ip6mr_cache_free(c);
1179 kfree_skb(skb);
1180 return err;
1181 }
1182
1183 atomic_inc(&mrt->cache_resolve_queue_len);
1184 list_add(&c->_c.list, &mrt->mfc_unres_queue);
1185 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1186
1187 ipmr_do_expire_process(mrt);
1188 }
1189
1190 /* See if we can append the packet */
1191 if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
1192 kfree_skb(skb);
1193 err = -ENOBUFS;
1194 } else {
1195 if (dev) {
1196 skb->dev = dev;
1197 skb->skb_iif = dev->ifindex;
1198 }
1199 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
1200 err = 0;
1201 }
1202
1203 spin_unlock_bh(&mfc_unres_lock);
1204 return err;
1205}
1206
1207/*
1208 * MFC6 cache manipulation by user space
1209 */
1210
1211static int ip6mr_mfc_delete(struct mr_table *mrt, struct mf6cctl *mfc,
1212 int parent)
1213{
1214 struct mfc6_cache *c;
1215
1216 /* The entries are added/deleted only under RTNL */
1217 rcu_read_lock();
1218 c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr,
1219 &mfc->mf6cc_mcastgrp.sin6_addr, parent);
1220 rcu_read_unlock();
1221 if (!c)
1222 return -ENOENT;
1223 rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ip6mr_rht_params);
1224 list_del_rcu(&c->_c.list);
1225
1226 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
1227 FIB_EVENT_ENTRY_DEL, c, mrt->id);
1228 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1229 mr_cache_put(&c->_c);
1230 return 0;
1231}
1232
1233static int ip6mr_device_event(struct notifier_block *this,
1234 unsigned long event, void *ptr)
1235{
1236 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1237 struct net *net = dev_net(dev);
1238 struct mr_table *mrt;
1239 struct vif_device *v;
1240 int ct;
1241
1242 if (event != NETDEV_UNREGISTER)
1243 return NOTIFY_DONE;
1244
1245 ip6mr_for_each_table(mrt, net) {
1246 v = &mrt->vif_table[0];
1247 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1248 if (v->dev == dev)
1249 mif6_delete(mrt, ct, 1, NULL);
1250 }
1251 }
1252
1253 return NOTIFY_DONE;
1254}
1255
1256static unsigned int ip6mr_seq_read(struct net *net)
1257{
1258 ASSERT_RTNL();
1259
1260 return net->ipv6.ipmr_seq + ip6mr_rules_seq_read(net);
1261}
1262
1263static int ip6mr_dump(struct net *net, struct notifier_block *nb,
1264 struct netlink_ext_ack *extack)
1265{
1266 return mr_dump(net, nb, RTNL_FAMILY_IP6MR, ip6mr_rules_dump,
1267 ip6mr_mr_table_iter, &mrt_lock, extack);
1268}
1269
1270static struct notifier_block ip6_mr_notifier = {
1271 .notifier_call = ip6mr_device_event
1272};
1273
1274static const struct fib_notifier_ops ip6mr_notifier_ops_template = {
1275 .family = RTNL_FAMILY_IP6MR,
1276 .fib_seq_read = ip6mr_seq_read,
1277 .fib_dump = ip6mr_dump,
1278 .owner = THIS_MODULE,
1279};
1280
1281static int __net_init ip6mr_notifier_init(struct net *net)
1282{
1283 struct fib_notifier_ops *ops;
1284
1285 net->ipv6.ipmr_seq = 0;
1286
1287 ops = fib_notifier_ops_register(&ip6mr_notifier_ops_template, net);
1288 if (IS_ERR(ops))
1289 return PTR_ERR(ops);
1290
1291 net->ipv6.ip6mr_notifier_ops = ops;
1292
1293 return 0;
1294}
1295
1296static void __net_exit ip6mr_notifier_exit(struct net *net)
1297{
1298 fib_notifier_ops_unregister(net->ipv6.ip6mr_notifier_ops);
1299 net->ipv6.ip6mr_notifier_ops = NULL;
1300}
1301
1302/* Setup for IP multicast routing */
1303static int __net_init ip6mr_net_init(struct net *net)
1304{
1305 int err;
1306
1307 err = ip6mr_notifier_init(net);
1308 if (err)
1309 return err;
1310
1311 err = ip6mr_rules_init(net);
1312 if (err < 0)
1313 goto ip6mr_rules_fail;
1314
1315#ifdef CONFIG_PROC_FS
1316 err = -ENOMEM;
1317 if (!proc_create_net("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_seq_ops,
1318 sizeof(struct mr_vif_iter)))
1319 goto proc_vif_fail;
1320 if (!proc_create_net("ip6_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops,
1321 sizeof(struct mr_mfc_iter)))
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, int flags)
1500{
1501 struct mr_mfc *c, *tmp;
1502 LIST_HEAD(list);
1503 int i;
1504
1505 /* Shut down all active vif entries */
1506 if (flags & (MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC)) {
1507 for (i = 0; i < mrt->maxvif; i++) {
1508 if (((mrt->vif_table[i].flags & VIFF_STATIC) &&
1509 !(flags & MRT6_FLUSH_MIFS_STATIC)) ||
1510 (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT6_FLUSH_MIFS)))
1511 continue;
1512 mif6_delete(mrt, i, 0, &list);
1513 }
1514 unregister_netdevice_many(&list);
1515 }
1516
1517 /* Wipe the cache */
1518 if (flags & (MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC)) {
1519 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
1520 if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC_STATIC)) ||
1521 (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC)))
1522 continue;
1523 rhltable_remove(&mrt->mfc_hash, &c->mnode, ip6mr_rht_params);
1524 list_del_rcu(&c->list);
1525 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
1526 FIB_EVENT_ENTRY_DEL,
1527 (struct mfc6_cache *)c, mrt->id);
1528 mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
1529 mr_cache_put(c);
1530 }
1531 }
1532
1533 if (flags & MRT6_FLUSH_MFC) {
1534 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1535 spin_lock_bh(&mfc_unres_lock);
1536 list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
1537 list_del(&c->list);
1538 mr6_netlink_event(mrt, (struct mfc6_cache *)c,
1539 RTM_DELROUTE);
1540 ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
1541 }
1542 spin_unlock_bh(&mfc_unres_lock);
1543 }
1544 }
1545}
1546
1547static int ip6mr_sk_init(struct mr_table *mrt, struct sock *sk)
1548{
1549 int err = 0;
1550 struct net *net = sock_net(sk);
1551
1552 rtnl_lock();
1553 write_lock_bh(&mrt_lock);
1554 if (rtnl_dereference(mrt->mroute_sk)) {
1555 err = -EADDRINUSE;
1556 } else {
1557 rcu_assign_pointer(mrt->mroute_sk, sk);
1558 sock_set_flag(sk, SOCK_RCU_FREE);
1559 net->ipv6.devconf_all->mc_forwarding++;
1560 }
1561 write_unlock_bh(&mrt_lock);
1562
1563 if (!err)
1564 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
1565 NETCONFA_MC_FORWARDING,
1566 NETCONFA_IFINDEX_ALL,
1567 net->ipv6.devconf_all);
1568 rtnl_unlock();
1569
1570 return err;
1571}
1572
1573int ip6mr_sk_done(struct sock *sk)
1574{
1575 int err = -EACCES;
1576 struct net *net = sock_net(sk);
1577 struct mr_table *mrt;
1578
1579 if (sk->sk_type != SOCK_RAW ||
1580 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1581 return err;
1582
1583 rtnl_lock();
1584 ip6mr_for_each_table(mrt, net) {
1585 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1586 write_lock_bh(&mrt_lock);
1587 RCU_INIT_POINTER(mrt->mroute_sk, NULL);
1588 /* Note that mroute_sk had SOCK_RCU_FREE set,
1589 * so the RCU grace period before sk freeing
1590 * is guaranteed by sk_destruct()
1591 */
1592 net->ipv6.devconf_all->mc_forwarding--;
1593 write_unlock_bh(&mrt_lock);
1594 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
1595 NETCONFA_MC_FORWARDING,
1596 NETCONFA_IFINDEX_ALL,
1597 net->ipv6.devconf_all);
1598
1599 mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MFC);
1600 err = 0;
1601 break;
1602 }
1603 }
1604 rtnl_unlock();
1605
1606 return err;
1607}
1608
1609bool mroute6_is_socket(struct net *net, struct sk_buff *skb)
1610{
1611 struct mr_table *mrt;
1612 struct flowi6 fl6 = {
1613 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
1614 .flowi6_oif = skb->dev->ifindex,
1615 .flowi6_mark = skb->mark,
1616 };
1617
1618 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1619 return NULL;
1620
1621 return rcu_access_pointer(mrt->mroute_sk);
1622}
1623EXPORT_SYMBOL(mroute6_is_socket);
1624
1625/*
1626 * Socket options and virtual interface manipulation. The whole
1627 * virtual interface system is a complete heap, but unfortunately
1628 * that's how BSD mrouted happens to think. Maybe one day with a proper
1629 * MOSPF/PIM router set up we can clean this up.
1630 */
1631
1632int ip6_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
1633 unsigned int optlen)
1634{
1635 int ret, parent = 0;
1636 struct mif6ctl vif;
1637 struct mf6cctl mfc;
1638 mifi_t mifi;
1639 struct net *net = sock_net(sk);
1640 struct mr_table *mrt;
1641
1642 if (sk->sk_type != SOCK_RAW ||
1643 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1644 return -EOPNOTSUPP;
1645
1646 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1647 if (!mrt)
1648 return -ENOENT;
1649
1650 if (optname != MRT6_INIT) {
1651 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
1652 !ns_capable(net->user_ns, CAP_NET_ADMIN))
1653 return -EACCES;
1654 }
1655
1656 switch (optname) {
1657 case MRT6_INIT:
1658 if (optlen < sizeof(int))
1659 return -EINVAL;
1660
1661 return ip6mr_sk_init(mrt, sk);
1662
1663 case MRT6_DONE:
1664 return ip6mr_sk_done(sk);
1665
1666 case MRT6_ADD_MIF:
1667 if (optlen < sizeof(vif))
1668 return -EINVAL;
1669 if (copy_from_sockptr(&vif, optval, sizeof(vif)))
1670 return -EFAULT;
1671 if (vif.mif6c_mifi >= MAXMIFS)
1672 return -ENFILE;
1673 rtnl_lock();
1674 ret = mif6_add(net, mrt, &vif,
1675 sk == rtnl_dereference(mrt->mroute_sk));
1676 rtnl_unlock();
1677 return ret;
1678
1679 case MRT6_DEL_MIF:
1680 if (optlen < sizeof(mifi_t))
1681 return -EINVAL;
1682 if (copy_from_sockptr(&mifi, optval, sizeof(mifi_t)))
1683 return -EFAULT;
1684 rtnl_lock();
1685 ret = mif6_delete(mrt, mifi, 0, NULL);
1686 rtnl_unlock();
1687 return ret;
1688
1689 /*
1690 * Manipulate the forwarding caches. These live
1691 * in a sort of kernel/user symbiosis.
1692 */
1693 case MRT6_ADD_MFC:
1694 case MRT6_DEL_MFC:
1695 parent = -1;
1696 fallthrough;
1697 case MRT6_ADD_MFC_PROXY:
1698 case MRT6_DEL_MFC_PROXY:
1699 if (optlen < sizeof(mfc))
1700 return -EINVAL;
1701 if (copy_from_sockptr(&mfc, optval, sizeof(mfc)))
1702 return -EFAULT;
1703 if (parent == 0)
1704 parent = mfc.mf6cc_parent;
1705 rtnl_lock();
1706 if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
1707 ret = ip6mr_mfc_delete(mrt, &mfc, parent);
1708 else
1709 ret = ip6mr_mfc_add(net, mrt, &mfc,
1710 sk ==
1711 rtnl_dereference(mrt->mroute_sk),
1712 parent);
1713 rtnl_unlock();
1714 return ret;
1715
1716 case MRT6_FLUSH:
1717 {
1718 int flags;
1719
1720 if (optlen != sizeof(flags))
1721 return -EINVAL;
1722 if (copy_from_sockptr(&flags, optval, sizeof(flags)))
1723 return -EFAULT;
1724 rtnl_lock();
1725 mroute_clean_tables(mrt, flags);
1726 rtnl_unlock();
1727 return 0;
1728 }
1729
1730 /*
1731 * Control PIM assert (to activate pim will activate assert)
1732 */
1733 case MRT6_ASSERT:
1734 {
1735 int v;
1736
1737 if (optlen != sizeof(v))
1738 return -EINVAL;
1739 if (copy_from_sockptr(&v, optval, sizeof(v)))
1740 return -EFAULT;
1741 mrt->mroute_do_assert = v;
1742 return 0;
1743 }
1744
1745#ifdef CONFIG_IPV6_PIMSM_V2
1746 case MRT6_PIM:
1747 {
1748 int v;
1749
1750 if (optlen != sizeof(v))
1751 return -EINVAL;
1752 if (copy_from_sockptr(&v, optval, sizeof(v)))
1753 return -EFAULT;
1754 v = !!v;
1755 rtnl_lock();
1756 ret = 0;
1757 if (v != mrt->mroute_do_pim) {
1758 mrt->mroute_do_pim = v;
1759 mrt->mroute_do_assert = v;
1760 }
1761 rtnl_unlock();
1762 return ret;
1763 }
1764
1765#endif
1766#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1767 case MRT6_TABLE:
1768 {
1769 u32 v;
1770
1771 if (optlen != sizeof(u32))
1772 return -EINVAL;
1773 if (copy_from_sockptr(&v, optval, sizeof(v)))
1774 return -EFAULT;
1775 /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
1776 if (v != RT_TABLE_DEFAULT && v >= 100000000)
1777 return -EINVAL;
1778 if (sk == rcu_access_pointer(mrt->mroute_sk))
1779 return -EBUSY;
1780
1781 rtnl_lock();
1782 ret = 0;
1783 mrt = ip6mr_new_table(net, v);
1784 if (IS_ERR(mrt))
1785 ret = PTR_ERR(mrt);
1786 else
1787 raw6_sk(sk)->ip6mr_table = v;
1788 rtnl_unlock();
1789 return ret;
1790 }
1791#endif
1792 /*
1793 * Spurious command, or MRT6_VERSION which you cannot
1794 * set.
1795 */
1796 default:
1797 return -ENOPROTOOPT;
1798 }
1799}
1800
1801/*
1802 * Getsock opt support for the multicast routing system.
1803 */
1804
1805int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1806 int __user *optlen)
1807{
1808 int olr;
1809 int val;
1810 struct net *net = sock_net(sk);
1811 struct mr_table *mrt;
1812
1813 if (sk->sk_type != SOCK_RAW ||
1814 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1815 return -EOPNOTSUPP;
1816
1817 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1818 if (!mrt)
1819 return -ENOENT;
1820
1821 switch (optname) {
1822 case MRT6_VERSION:
1823 val = 0x0305;
1824 break;
1825#ifdef CONFIG_IPV6_PIMSM_V2
1826 case MRT6_PIM:
1827 val = mrt->mroute_do_pim;
1828 break;
1829#endif
1830 case MRT6_ASSERT:
1831 val = mrt->mroute_do_assert;
1832 break;
1833 default:
1834 return -ENOPROTOOPT;
1835 }
1836
1837 if (get_user(olr, optlen))
1838 return -EFAULT;
1839
1840 olr = min_t(int, olr, sizeof(int));
1841 if (olr < 0)
1842 return -EINVAL;
1843
1844 if (put_user(olr, optlen))
1845 return -EFAULT;
1846 if (copy_to_user(optval, &val, olr))
1847 return -EFAULT;
1848 return 0;
1849}
1850
1851/*
1852 * The IP multicast ioctl support routines.
1853 */
1854
1855int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1856{
1857 struct sioc_sg_req6 sr;
1858 struct sioc_mif_req6 vr;
1859 struct vif_device *vif;
1860 struct mfc6_cache *c;
1861 struct net *net = sock_net(sk);
1862 struct mr_table *mrt;
1863
1864 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1865 if (!mrt)
1866 return -ENOENT;
1867
1868 switch (cmd) {
1869 case SIOCGETMIFCNT_IN6:
1870 if (copy_from_user(&vr, arg, sizeof(vr)))
1871 return -EFAULT;
1872 if (vr.mifi >= mrt->maxvif)
1873 return -EINVAL;
1874 vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif);
1875 read_lock(&mrt_lock);
1876 vif = &mrt->vif_table[vr.mifi];
1877 if (VIF_EXISTS(mrt, vr.mifi)) {
1878 vr.icount = vif->pkt_in;
1879 vr.ocount = vif->pkt_out;
1880 vr.ibytes = vif->bytes_in;
1881 vr.obytes = vif->bytes_out;
1882 read_unlock(&mrt_lock);
1883
1884 if (copy_to_user(arg, &vr, sizeof(vr)))
1885 return -EFAULT;
1886 return 0;
1887 }
1888 read_unlock(&mrt_lock);
1889 return -EADDRNOTAVAIL;
1890 case SIOCGETSGCNT_IN6:
1891 if (copy_from_user(&sr, arg, sizeof(sr)))
1892 return -EFAULT;
1893
1894 rcu_read_lock();
1895 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1896 if (c) {
1897 sr.pktcnt = c->_c.mfc_un.res.pkt;
1898 sr.bytecnt = c->_c.mfc_un.res.bytes;
1899 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1900 rcu_read_unlock();
1901
1902 if (copy_to_user(arg, &sr, sizeof(sr)))
1903 return -EFAULT;
1904 return 0;
1905 }
1906 rcu_read_unlock();
1907 return -EADDRNOTAVAIL;
1908 default:
1909 return -ENOIOCTLCMD;
1910 }
1911}
1912
1913#ifdef CONFIG_COMPAT
1914struct compat_sioc_sg_req6 {
1915 struct sockaddr_in6 src;
1916 struct sockaddr_in6 grp;
1917 compat_ulong_t pktcnt;
1918 compat_ulong_t bytecnt;
1919 compat_ulong_t wrong_if;
1920};
1921
1922struct compat_sioc_mif_req6 {
1923 mifi_t mifi;
1924 compat_ulong_t icount;
1925 compat_ulong_t ocount;
1926 compat_ulong_t ibytes;
1927 compat_ulong_t obytes;
1928};
1929
1930int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1931{
1932 struct compat_sioc_sg_req6 sr;
1933 struct compat_sioc_mif_req6 vr;
1934 struct vif_device *vif;
1935 struct mfc6_cache *c;
1936 struct net *net = sock_net(sk);
1937 struct mr_table *mrt;
1938
1939 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1940 if (!mrt)
1941 return -ENOENT;
1942
1943 switch (cmd) {
1944 case SIOCGETMIFCNT_IN6:
1945 if (copy_from_user(&vr, arg, sizeof(vr)))
1946 return -EFAULT;
1947 if (vr.mifi >= mrt->maxvif)
1948 return -EINVAL;
1949 vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif);
1950 read_lock(&mrt_lock);
1951 vif = &mrt->vif_table[vr.mifi];
1952 if (VIF_EXISTS(mrt, vr.mifi)) {
1953 vr.icount = vif->pkt_in;
1954 vr.ocount = vif->pkt_out;
1955 vr.ibytes = vif->bytes_in;
1956 vr.obytes = vif->bytes_out;
1957 read_unlock(&mrt_lock);
1958
1959 if (copy_to_user(arg, &vr, sizeof(vr)))
1960 return -EFAULT;
1961 return 0;
1962 }
1963 read_unlock(&mrt_lock);
1964 return -EADDRNOTAVAIL;
1965 case SIOCGETSGCNT_IN6:
1966 if (copy_from_user(&sr, arg, sizeof(sr)))
1967 return -EFAULT;
1968
1969 rcu_read_lock();
1970 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1971 if (c) {
1972 sr.pktcnt = c->_c.mfc_un.res.pkt;
1973 sr.bytecnt = c->_c.mfc_un.res.bytes;
1974 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1975 rcu_read_unlock();
1976
1977 if (copy_to_user(arg, &sr, sizeof(sr)))
1978 return -EFAULT;
1979 return 0;
1980 }
1981 rcu_read_unlock();
1982 return -EADDRNOTAVAIL;
1983 default:
1984 return -ENOIOCTLCMD;
1985 }
1986}
1987#endif
1988
1989static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
1990{
1991 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
1992 IPSTATS_MIB_OUTFORWDATAGRAMS);
1993 IP6_ADD_STATS(net, ip6_dst_idev(skb_dst(skb)),
1994 IPSTATS_MIB_OUTOCTETS, skb->len);
1995 return dst_output(net, sk, skb);
1996}
1997
1998/*
1999 * Processing handlers for ip6mr_forward
2000 */
2001
2002static int ip6mr_forward2(struct net *net, struct mr_table *mrt,
2003 struct sk_buff *skb, int vifi)
2004{
2005 struct ipv6hdr *ipv6h;
2006 struct vif_device *vif = &mrt->vif_table[vifi];
2007 struct net_device *dev;
2008 struct dst_entry *dst;
2009 struct flowi6 fl6;
2010
2011 if (!vif->dev)
2012 goto out_free;
2013
2014#ifdef CONFIG_IPV6_PIMSM_V2
2015 if (vif->flags & MIFF_REGISTER) {
2016 vif->pkt_out++;
2017 vif->bytes_out += skb->len;
2018 vif->dev->stats.tx_bytes += skb->len;
2019 vif->dev->stats.tx_packets++;
2020 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
2021 goto out_free;
2022 }
2023#endif
2024
2025 ipv6h = ipv6_hdr(skb);
2026
2027 fl6 = (struct flowi6) {
2028 .flowi6_oif = vif->link,
2029 .daddr = ipv6h->daddr,
2030 };
2031
2032 dst = ip6_route_output(net, NULL, &fl6);
2033 if (dst->error) {
2034 dst_release(dst);
2035 goto out_free;
2036 }
2037
2038 skb_dst_drop(skb);
2039 skb_dst_set(skb, dst);
2040
2041 /*
2042 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
2043 * not only before forwarding, but after forwarding on all output
2044 * interfaces. It is clear, if mrouter runs a multicasting
2045 * program, it should receive packets not depending to what interface
2046 * program is joined.
2047 * If we will not make it, the program will have to join on all
2048 * interfaces. On the other hand, multihoming host (or router, but
2049 * not mrouter) cannot join to more than one interface - it will
2050 * result in receiving multiple packets.
2051 */
2052 dev = vif->dev;
2053 skb->dev = dev;
2054 vif->pkt_out++;
2055 vif->bytes_out += skb->len;
2056
2057 /* We are about to write */
2058 /* XXX: extension headers? */
2059 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
2060 goto out_free;
2061
2062 ipv6h = ipv6_hdr(skb);
2063 ipv6h->hop_limit--;
2064
2065 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
2066
2067 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
2068 net, NULL, skb, skb->dev, dev,
2069 ip6mr_forward2_finish);
2070
2071out_free:
2072 kfree_skb(skb);
2073 return 0;
2074}
2075
2076static int ip6mr_find_vif(struct mr_table *mrt, struct net_device *dev)
2077{
2078 int ct;
2079
2080 for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
2081 if (mrt->vif_table[ct].dev == dev)
2082 break;
2083 }
2084 return ct;
2085}
2086
2087static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
2088 struct net_device *dev, struct sk_buff *skb,
2089 struct mfc6_cache *c)
2090{
2091 int psend = -1;
2092 int vif, ct;
2093 int true_vifi = ip6mr_find_vif(mrt, dev);
2094
2095 vif = c->_c.mfc_parent;
2096 c->_c.mfc_un.res.pkt++;
2097 c->_c.mfc_un.res.bytes += skb->len;
2098 c->_c.mfc_un.res.lastuse = jiffies;
2099
2100 if (ipv6_addr_any(&c->mf6c_origin) && true_vifi >= 0) {
2101 struct mfc6_cache *cache_proxy;
2102
2103 /* For an (*,G) entry, we only check that the incoming
2104 * interface is part of the static tree.
2105 */
2106 rcu_read_lock();
2107 cache_proxy = mr_mfc_find_any_parent(mrt, vif);
2108 if (cache_proxy &&
2109 cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255) {
2110 rcu_read_unlock();
2111 goto forward;
2112 }
2113 rcu_read_unlock();
2114 }
2115
2116 /*
2117 * Wrong interface: drop packet and (maybe) send PIM assert.
2118 */
2119 if (mrt->vif_table[vif].dev != dev) {
2120 c->_c.mfc_un.res.wrong_if++;
2121
2122 if (true_vifi >= 0 && mrt->mroute_do_assert &&
2123 /* pimsm uses asserts, when switching from RPT to SPT,
2124 so that we cannot check that packet arrived on an oif.
2125 It is bad, but otherwise we would need to move pretty
2126 large chunk of pimd to kernel. Ough... --ANK
2127 */
2128 (mrt->mroute_do_pim ||
2129 c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
2130 time_after(jiffies,
2131 c->_c.mfc_un.res.last_assert +
2132 MFC_ASSERT_THRESH)) {
2133 c->_c.mfc_un.res.last_assert = jiffies;
2134 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2135 }
2136 goto dont_forward;
2137 }
2138
2139forward:
2140 mrt->vif_table[vif].pkt_in++;
2141 mrt->vif_table[vif].bytes_in += skb->len;
2142
2143 /*
2144 * Forward the frame
2145 */
2146 if (ipv6_addr_any(&c->mf6c_origin) &&
2147 ipv6_addr_any(&c->mf6c_mcastgrp)) {
2148 if (true_vifi >= 0 &&
2149 true_vifi != c->_c.mfc_parent &&
2150 ipv6_hdr(skb)->hop_limit >
2151 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
2152 /* It's an (*,*) entry and the packet is not coming from
2153 * the upstream: forward the packet to the upstream
2154 * only.
2155 */
2156 psend = c->_c.mfc_parent;
2157 goto last_forward;
2158 }
2159 goto dont_forward;
2160 }
2161 for (ct = c->_c.mfc_un.res.maxvif - 1;
2162 ct >= c->_c.mfc_un.res.minvif; ct--) {
2163 /* For (*,G) entry, don't forward to the incoming interface */
2164 if ((!ipv6_addr_any(&c->mf6c_origin) || ct != true_vifi) &&
2165 ipv6_hdr(skb)->hop_limit > c->_c.mfc_un.res.ttls[ct]) {
2166 if (psend != -1) {
2167 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2168 if (skb2)
2169 ip6mr_forward2(net, mrt, skb2, psend);
2170 }
2171 psend = ct;
2172 }
2173 }
2174last_forward:
2175 if (psend != -1) {
2176 ip6mr_forward2(net, mrt, skb, psend);
2177 return;
2178 }
2179
2180dont_forward:
2181 kfree_skb(skb);
2182}
2183
2184
2185/*
2186 * Multicast packets for forwarding arrive here
2187 */
2188
2189int ip6_mr_input(struct sk_buff *skb)
2190{
2191 struct mfc6_cache *cache;
2192 struct net *net = dev_net(skb->dev);
2193 struct mr_table *mrt;
2194 struct flowi6 fl6 = {
2195 .flowi6_iif = skb->dev->ifindex,
2196 .flowi6_mark = skb->mark,
2197 };
2198 int err;
2199 struct net_device *dev;
2200
2201 /* skb->dev passed in is the master dev for vrfs.
2202 * Get the proper interface that does have a vif associated with it.
2203 */
2204 dev = skb->dev;
2205 if (netif_is_l3_master(skb->dev)) {
2206 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
2207 if (!dev) {
2208 kfree_skb(skb);
2209 return -ENODEV;
2210 }
2211 }
2212
2213 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2214 if (err < 0) {
2215 kfree_skb(skb);
2216 return err;
2217 }
2218
2219 read_lock(&mrt_lock);
2220 cache = ip6mr_cache_find(mrt,
2221 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2222 if (!cache) {
2223 int vif = ip6mr_find_vif(mrt, dev);
2224
2225 if (vif >= 0)
2226 cache = ip6mr_cache_find_any(mrt,
2227 &ipv6_hdr(skb)->daddr,
2228 vif);
2229 }
2230
2231 /*
2232 * No usable cache entry
2233 */
2234 if (!cache) {
2235 int vif;
2236
2237 vif = ip6mr_find_vif(mrt, dev);
2238 if (vif >= 0) {
2239 int err = ip6mr_cache_unresolved(mrt, vif, skb, dev);
2240 read_unlock(&mrt_lock);
2241
2242 return err;
2243 }
2244 read_unlock(&mrt_lock);
2245 kfree_skb(skb);
2246 return -ENODEV;
2247 }
2248
2249 ip6_mr_forward(net, mrt, dev, skb, cache);
2250
2251 read_unlock(&mrt_lock);
2252
2253 return 0;
2254}
2255
2256int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm,
2257 u32 portid)
2258{
2259 int err;
2260 struct mr_table *mrt;
2261 struct mfc6_cache *cache;
2262 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
2263
2264 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2265 if (!mrt)
2266 return -ENOENT;
2267
2268 read_lock(&mrt_lock);
2269 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2270 if (!cache && skb->dev) {
2271 int vif = ip6mr_find_vif(mrt, skb->dev);
2272
2273 if (vif >= 0)
2274 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
2275 vif);
2276 }
2277
2278 if (!cache) {
2279 struct sk_buff *skb2;
2280 struct ipv6hdr *iph;
2281 struct net_device *dev;
2282 int vif;
2283
2284 dev = skb->dev;
2285 if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2286 read_unlock(&mrt_lock);
2287 return -ENODEV;
2288 }
2289
2290 /* really correct? */
2291 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2292 if (!skb2) {
2293 read_unlock(&mrt_lock);
2294 return -ENOMEM;
2295 }
2296
2297 NETLINK_CB(skb2).portid = portid;
2298 skb_reset_transport_header(skb2);
2299
2300 skb_put(skb2, sizeof(struct ipv6hdr));
2301 skb_reset_network_header(skb2);
2302
2303 iph = ipv6_hdr(skb2);
2304 iph->version = 0;
2305 iph->priority = 0;
2306 iph->flow_lbl[0] = 0;
2307 iph->flow_lbl[1] = 0;
2308 iph->flow_lbl[2] = 0;
2309 iph->payload_len = 0;
2310 iph->nexthdr = IPPROTO_NONE;
2311 iph->hop_limit = 0;
2312 iph->saddr = rt->rt6i_src.addr;
2313 iph->daddr = rt->rt6i_dst.addr;
2314
2315 err = ip6mr_cache_unresolved(mrt, vif, skb2, dev);
2316 read_unlock(&mrt_lock);
2317
2318 return err;
2319 }
2320
2321 err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
2322 read_unlock(&mrt_lock);
2323 return err;
2324}
2325
2326static int ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2327 u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
2328 int flags)
2329{
2330 struct nlmsghdr *nlh;
2331 struct rtmsg *rtm;
2332 int err;
2333
2334 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2335 if (!nlh)
2336 return -EMSGSIZE;
2337
2338 rtm = nlmsg_data(nlh);
2339 rtm->rtm_family = RTNL_FAMILY_IP6MR;
2340 rtm->rtm_dst_len = 128;
2341 rtm->rtm_src_len = 128;
2342 rtm->rtm_tos = 0;
2343 rtm->rtm_table = mrt->id;
2344 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2345 goto nla_put_failure;
2346 rtm->rtm_type = RTN_MULTICAST;
2347 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2348 if (c->_c.mfc_flags & MFC_STATIC)
2349 rtm->rtm_protocol = RTPROT_STATIC;
2350 else
2351 rtm->rtm_protocol = RTPROT_MROUTED;
2352 rtm->rtm_flags = 0;
2353
2354 if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) ||
2355 nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp))
2356 goto nla_put_failure;
2357 err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
2358 /* do not break the dump if cache is unresolved */
2359 if (err < 0 && err != -ENOENT)
2360 goto nla_put_failure;
2361
2362 nlmsg_end(skb, nlh);
2363 return 0;
2364
2365nla_put_failure:
2366 nlmsg_cancel(skb, nlh);
2367 return -EMSGSIZE;
2368}
2369
2370static int _ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2371 u32 portid, u32 seq, struct mr_mfc *c,
2372 int cmd, int flags)
2373{
2374 return ip6mr_fill_mroute(mrt, skb, portid, seq, (struct mfc6_cache *)c,
2375 cmd, flags);
2376}
2377
2378static int mr6_msgsize(bool unresolved, int maxvif)
2379{
2380 size_t len =
2381 NLMSG_ALIGN(sizeof(struct rtmsg))
2382 + nla_total_size(4) /* RTA_TABLE */
2383 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
2384 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
2385 ;
2386
2387 if (!unresolved)
2388 len = len
2389 + nla_total_size(4) /* RTA_IIF */
2390 + nla_total_size(0) /* RTA_MULTIPATH */
2391 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2392 /* RTA_MFC_STATS */
2393 + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
2394 ;
2395
2396 return len;
2397}
2398
2399static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
2400 int cmd)
2401{
2402 struct net *net = read_pnet(&mrt->net);
2403 struct sk_buff *skb;
2404 int err = -ENOBUFS;
2405
2406 skb = nlmsg_new(mr6_msgsize(mfc->_c.mfc_parent >= MAXMIFS, mrt->maxvif),
2407 GFP_ATOMIC);
2408 if (!skb)
2409 goto errout;
2410
2411 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2412 if (err < 0)
2413 goto errout;
2414
2415 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
2416 return;
2417
2418errout:
2419 kfree_skb(skb);
2420 if (err < 0)
2421 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
2422}
2423
2424static size_t mrt6msg_netlink_msgsize(size_t payloadlen)
2425{
2426 size_t len =
2427 NLMSG_ALIGN(sizeof(struct rtgenmsg))
2428 + nla_total_size(1) /* IP6MRA_CREPORT_MSGTYPE */
2429 + nla_total_size(4) /* IP6MRA_CREPORT_MIF_ID */
2430 /* IP6MRA_CREPORT_SRC_ADDR */
2431 + nla_total_size(sizeof(struct in6_addr))
2432 /* IP6MRA_CREPORT_DST_ADDR */
2433 + nla_total_size(sizeof(struct in6_addr))
2434 /* IP6MRA_CREPORT_PKT */
2435 + nla_total_size(payloadlen)
2436 ;
2437
2438 return len;
2439}
2440
2441static void mrt6msg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt)
2442{
2443 struct net *net = read_pnet(&mrt->net);
2444 struct nlmsghdr *nlh;
2445 struct rtgenmsg *rtgenm;
2446 struct mrt6msg *msg;
2447 struct sk_buff *skb;
2448 struct nlattr *nla;
2449 int payloadlen;
2450
2451 payloadlen = pkt->len - sizeof(struct mrt6msg);
2452 msg = (struct mrt6msg *)skb_transport_header(pkt);
2453
2454 skb = nlmsg_new(mrt6msg_netlink_msgsize(payloadlen), GFP_ATOMIC);
2455 if (!skb)
2456 goto errout;
2457
2458 nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
2459 sizeof(struct rtgenmsg), 0);
2460 if (!nlh)
2461 goto errout;
2462 rtgenm = nlmsg_data(nlh);
2463 rtgenm->rtgen_family = RTNL_FAMILY_IP6MR;
2464 if (nla_put_u8(skb, IP6MRA_CREPORT_MSGTYPE, msg->im6_msgtype) ||
2465 nla_put_u32(skb, IP6MRA_CREPORT_MIF_ID, msg->im6_mif) ||
2466 nla_put_in6_addr(skb, IP6MRA_CREPORT_SRC_ADDR,
2467 &msg->im6_src) ||
2468 nla_put_in6_addr(skb, IP6MRA_CREPORT_DST_ADDR,
2469 &msg->im6_dst))
2470 goto nla_put_failure;
2471
2472 nla = nla_reserve(skb, IP6MRA_CREPORT_PKT, payloadlen);
2473 if (!nla || skb_copy_bits(pkt, sizeof(struct mrt6msg),
2474 nla_data(nla), payloadlen))
2475 goto nla_put_failure;
2476
2477 nlmsg_end(skb, nlh);
2478
2479 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE_R, NULL, GFP_ATOMIC);
2480 return;
2481
2482nla_put_failure:
2483 nlmsg_cancel(skb, nlh);
2484errout:
2485 kfree_skb(skb);
2486 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE_R, -ENOBUFS);
2487}
2488
2489static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2490{
2491 const struct nlmsghdr *nlh = cb->nlh;
2492 struct fib_dump_filter filter = {};
2493 int err;
2494
2495 if (cb->strict_check) {
2496 err = ip_valid_fib_dump_req(sock_net(skb->sk), nlh,
2497 &filter, cb);
2498 if (err < 0)
2499 return err;
2500 }
2501
2502 if (filter.table_id) {
2503 struct mr_table *mrt;
2504
2505 mrt = ip6mr_get_table(sock_net(skb->sk), filter.table_id);
2506 if (!mrt) {
2507 if (rtnl_msg_family(cb->nlh) != RTNL_FAMILY_IP6MR)
2508 return skb->len;
2509
2510 NL_SET_ERR_MSG_MOD(cb->extack, "MR table does not exist");
2511 return -ENOENT;
2512 }
2513 err = mr_table_dump(mrt, skb, cb, _ip6mr_fill_mroute,
2514 &mfc_unres_lock, &filter);
2515 return skb->len ? : err;
2516 }
2517
2518 return mr_rtm_dumproute(skb, cb, ip6mr_mr_table_iter,
2519 _ip6mr_fill_mroute, &mfc_unres_lock, &filter);
2520}