2 * Linux IPv6 multicast routing support for BSD pim6sd
3 * Based on net/ipv4/ipmr.c.
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>
9 * Copyright (C)2007,2008 USAGI/WIDE Project
10 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
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.
19 #include <asm/uaccess.h>
20 #include <linux/types.h>
21 #include <linux/sched.h>
22 #include <linux/errno.h>
23 #include <linux/timer.h>
25 #include <linux/kernel.h>
26 #include <linux/fcntl.h>
27 #include <linux/stat.h>
28 #include <linux/socket.h>
29 #include <linux/inet.h>
30 #include <linux/netdevice.h>
31 #include <linux/inetdevice.h>
32 #include <linux/proc_fs.h>
33 #include <linux/seq_file.h>
34 #include <linux/init.h>
35 #include <linux/slab.h>
36 #include <linux/compat.h>
37 #include <net/protocol.h>
38 #include <linux/skbuff.h>
41 #include <linux/notifier.h>
42 #include <linux/if_arp.h>
43 #include <net/checksum.h>
44 #include <net/netlink.h>
45 #include <net/fib_rules.h>
48 #include <net/ip6_route.h>
49 #include <linux/mroute6.h>
50 #include <linux/pim.h>
51 #include <net/addrconf.h>
52 #include <linux/netfilter_ipv6.h>
53 #include <linux/export.h>
54 #include <net/ip6_checksum.h>
55 #include <linux/netconf.h>
58 struct list_head list;
63 struct sock *mroute6_sk;
64 struct timer_list ipmr_expire_timer;
65 struct list_head mfc6_unres_queue;
66 struct list_head mfc6_cache_array[MFC6_LINES];
67 struct mif_device vif6_table[MAXMIFS];
69 atomic_t cache_resolve_queue_len;
70 bool mroute_do_assert;
72 #ifdef CONFIG_IPV6_PIMSM_V2
73 int mroute_reg_vif_num;
78 struct fib_rule common;
82 struct mr6_table *mrt;
85 /* Big lock, protecting vif table, mrt cache and mroute socket state.
86 Note that the changes are semaphored via rtnl_lock.
89 static DEFINE_RWLOCK(mrt_lock);
92 * Multicast router control variables
95 #define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL)
97 /* Special spinlock for queue of unresolved entries */
98 static DEFINE_SPINLOCK(mfc_unres_lock);
100 /* We return to original Alan's scheme. Hash table of resolved
101 entries is changed only in process context and protected
102 with weak lock mrt_lock. Queue of unresolved entries is protected
103 with strong spinlock mfc_unres_lock.
105 In this case data path is free of exclusive locks at all.
108 static struct kmem_cache *mrt_cachep __read_mostly;
110 static struct mr6_table *ip6mr_new_table(struct net *net, u32 id);
111 static void ip6mr_free_table(struct mr6_table *mrt);
113 static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
114 struct sk_buff *skb, struct mfc6_cache *cache);
115 static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
116 mifi_t mifi, int assert);
117 static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
118 struct mfc6_cache *c, struct rtmsg *rtm);
119 static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
121 static int ip6mr_rtm_dumproute(struct sk_buff *skb,
122 struct netlink_callback *cb);
123 static void mroute_clean_tables(struct mr6_table *mrt);
124 static void ipmr_expire_process(unsigned long arg);
126 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
127 #define ip6mr_for_each_table(mrt, net) \
128 list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list)
130 static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
132 struct mr6_table *mrt;
134 ip6mr_for_each_table(mrt, net) {
141 static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
142 struct mr6_table **mrt)
144 struct ip6mr_result res;
145 struct fib_lookup_arg arg = { .result = &res, };
148 err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
149 flowi6_to_flowi(flp6), 0, &arg);
156 static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
157 int flags, struct fib_lookup_arg *arg)
159 struct ip6mr_result *res = arg->result;
160 struct mr6_table *mrt;
162 switch (rule->action) {
165 case FR_ACT_UNREACHABLE:
167 case FR_ACT_PROHIBIT:
169 case FR_ACT_BLACKHOLE:
174 mrt = ip6mr_get_table(rule->fr_net, rule->table);
181 static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
186 static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = {
190 static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
191 struct fib_rule_hdr *frh, struct nlattr **tb)
196 static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
202 static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
203 struct fib_rule_hdr *frh)
211 static 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 .default_pref = fib_default_rule_pref,
220 .fill = ip6mr_rule_fill,
221 .nlgroup = RTNLGRP_IPV6_RULE,
222 .policy = ip6mr_rule_policy,
223 .owner = THIS_MODULE,
226 static int __net_init ip6mr_rules_init(struct net *net)
228 struct fib_rules_ops *ops;
229 struct mr6_table *mrt;
232 ops = fib_rules_register(&ip6mr_rules_ops_template, net);
236 INIT_LIST_HEAD(&net->ipv6.mr6_tables);
238 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
244 err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
248 net->ipv6.mr6_rules_ops = ops;
254 fib_rules_unregister(ops);
258 static void __net_exit ip6mr_rules_exit(struct net *net)
260 struct mr6_table *mrt, *next;
263 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
264 list_del(&mrt->list);
265 ip6mr_free_table(mrt);
268 fib_rules_unregister(net->ipv6.mr6_rules_ops);
271 #define ip6mr_for_each_table(mrt, net) \
272 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
274 static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
276 return net->ipv6.mrt6;
279 static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
280 struct mr6_table **mrt)
282 *mrt = net->ipv6.mrt6;
286 static int __net_init ip6mr_rules_init(struct net *net)
288 net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT);
289 return net->ipv6.mrt6 ? 0 : -ENOMEM;
292 static void __net_exit ip6mr_rules_exit(struct net *net)
295 ip6mr_free_table(net->ipv6.mrt6);
296 net->ipv6.mrt6 = NULL;
301 static struct mr6_table *ip6mr_new_table(struct net *net, u32 id)
303 struct mr6_table *mrt;
306 mrt = ip6mr_get_table(net, id);
310 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
314 write_pnet(&mrt->net, net);
316 /* Forwarding cache */
317 for (i = 0; i < MFC6_LINES; i++)
318 INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]);
320 INIT_LIST_HEAD(&mrt->mfc6_unres_queue);
322 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
325 #ifdef CONFIG_IPV6_PIMSM_V2
326 mrt->mroute_reg_vif_num = -1;
328 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
329 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
334 static void ip6mr_free_table(struct mr6_table *mrt)
336 del_timer(&mrt->ipmr_expire_timer);
337 mroute_clean_tables(mrt);
341 #ifdef CONFIG_PROC_FS
343 struct ipmr_mfc_iter {
344 struct seq_net_private p;
345 struct mr6_table *mrt;
346 struct list_head *cache;
351 static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net,
352 struct ipmr_mfc_iter *it, loff_t pos)
354 struct mr6_table *mrt = it->mrt;
355 struct mfc6_cache *mfc;
357 read_lock(&mrt_lock);
358 for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) {
359 it->cache = &mrt->mfc6_cache_array[it->ct];
360 list_for_each_entry(mfc, it->cache, list)
364 read_unlock(&mrt_lock);
366 spin_lock_bh(&mfc_unres_lock);
367 it->cache = &mrt->mfc6_unres_queue;
368 list_for_each_entry(mfc, it->cache, list)
371 spin_unlock_bh(&mfc_unres_lock);
378 * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif
381 struct ipmr_vif_iter {
382 struct seq_net_private p;
383 struct mr6_table *mrt;
387 static struct mif_device *ip6mr_vif_seq_idx(struct net *net,
388 struct ipmr_vif_iter *iter,
391 struct mr6_table *mrt = iter->mrt;
393 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
394 if (!MIF_EXISTS(mrt, iter->ct))
397 return &mrt->vif6_table[iter->ct];
402 static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
405 struct ipmr_vif_iter *iter = seq->private;
406 struct net *net = seq_file_net(seq);
407 struct mr6_table *mrt;
409 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
411 return ERR_PTR(-ENOENT);
415 read_lock(&mrt_lock);
416 return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1)
420 static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
422 struct ipmr_vif_iter *iter = seq->private;
423 struct net *net = seq_file_net(seq);
424 struct mr6_table *mrt = iter->mrt;
427 if (v == SEQ_START_TOKEN)
428 return ip6mr_vif_seq_idx(net, iter, 0);
430 while (++iter->ct < mrt->maxvif) {
431 if (!MIF_EXISTS(mrt, iter->ct))
433 return &mrt->vif6_table[iter->ct];
438 static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
441 read_unlock(&mrt_lock);
444 static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
446 struct ipmr_vif_iter *iter = seq->private;
447 struct mr6_table *mrt = iter->mrt;
449 if (v == SEQ_START_TOKEN) {
451 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
453 const struct mif_device *vif = v;
454 const char *name = vif->dev ? vif->dev->name : "none";
457 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
458 vif - mrt->vif6_table,
459 name, vif->bytes_in, vif->pkt_in,
460 vif->bytes_out, vif->pkt_out,
466 static const struct seq_operations ip6mr_vif_seq_ops = {
467 .start = ip6mr_vif_seq_start,
468 .next = ip6mr_vif_seq_next,
469 .stop = ip6mr_vif_seq_stop,
470 .show = ip6mr_vif_seq_show,
473 static int ip6mr_vif_open(struct inode *inode, struct file *file)
475 return seq_open_net(inode, file, &ip6mr_vif_seq_ops,
476 sizeof(struct ipmr_vif_iter));
479 static const struct file_operations ip6mr_vif_fops = {
480 .owner = THIS_MODULE,
481 .open = ip6mr_vif_open,
484 .release = seq_release_net,
487 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
489 struct ipmr_mfc_iter *it = seq->private;
490 struct net *net = seq_file_net(seq);
491 struct mr6_table *mrt;
493 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
495 return ERR_PTR(-ENOENT);
498 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
502 static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
504 struct mfc6_cache *mfc = v;
505 struct ipmr_mfc_iter *it = seq->private;
506 struct net *net = seq_file_net(seq);
507 struct mr6_table *mrt = it->mrt;
511 if (v == SEQ_START_TOKEN)
512 return ipmr_mfc_seq_idx(net, seq->private, 0);
514 if (mfc->list.next != it->cache)
515 return list_entry(mfc->list.next, struct mfc6_cache, list);
517 if (it->cache == &mrt->mfc6_unres_queue)
520 BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]);
522 while (++it->ct < MFC6_LINES) {
523 it->cache = &mrt->mfc6_cache_array[it->ct];
524 if (list_empty(it->cache))
526 return list_first_entry(it->cache, struct mfc6_cache, list);
529 /* exhausted cache_array, show unresolved */
530 read_unlock(&mrt_lock);
531 it->cache = &mrt->mfc6_unres_queue;
534 spin_lock_bh(&mfc_unres_lock);
535 if (!list_empty(it->cache))
536 return list_first_entry(it->cache, struct mfc6_cache, list);
539 spin_unlock_bh(&mfc_unres_lock);
545 static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
547 struct ipmr_mfc_iter *it = seq->private;
548 struct mr6_table *mrt = it->mrt;
550 if (it->cache == &mrt->mfc6_unres_queue)
551 spin_unlock_bh(&mfc_unres_lock);
552 else if (it->cache == mrt->mfc6_cache_array)
553 read_unlock(&mrt_lock);
556 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
560 if (v == SEQ_START_TOKEN) {
564 "Iif Pkts Bytes Wrong Oifs\n");
566 const struct mfc6_cache *mfc = v;
567 const struct ipmr_mfc_iter *it = seq->private;
568 struct mr6_table *mrt = it->mrt;
570 seq_printf(seq, "%pI6 %pI6 %-3hd",
571 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
574 if (it->cache != &mrt->mfc6_unres_queue) {
575 seq_printf(seq, " %8lu %8lu %8lu",
577 mfc->mfc_un.res.bytes,
578 mfc->mfc_un.res.wrong_if);
579 for (n = mfc->mfc_un.res.minvif;
580 n < mfc->mfc_un.res.maxvif; n++) {
581 if (MIF_EXISTS(mrt, n) &&
582 mfc->mfc_un.res.ttls[n] < 255)
585 n, mfc->mfc_un.res.ttls[n]);
588 /* unresolved mfc_caches don't contain
589 * pkt, bytes and wrong_if values
591 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
598 static const struct seq_operations ipmr_mfc_seq_ops = {
599 .start = ipmr_mfc_seq_start,
600 .next = ipmr_mfc_seq_next,
601 .stop = ipmr_mfc_seq_stop,
602 .show = ipmr_mfc_seq_show,
605 static int ipmr_mfc_open(struct inode *inode, struct file *file)
607 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
608 sizeof(struct ipmr_mfc_iter));
611 static const struct file_operations ip6mr_mfc_fops = {
612 .owner = THIS_MODULE,
613 .open = ipmr_mfc_open,
616 .release = seq_release_net,
620 #ifdef CONFIG_IPV6_PIMSM_V2
622 static int pim6_rcv(struct sk_buff *skb)
624 struct pimreghdr *pim;
625 struct ipv6hdr *encap;
626 struct net_device *reg_dev = NULL;
627 struct net *net = dev_net(skb->dev);
628 struct mr6_table *mrt;
629 struct flowi6 fl6 = {
630 .flowi6_iif = skb->dev->ifindex,
631 .flowi6_mark = skb->mark,
635 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
638 pim = (struct pimreghdr *)skb_transport_header(skb);
639 if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
640 (pim->flags & PIM_NULL_REGISTER) ||
641 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
642 sizeof(*pim), IPPROTO_PIM,
643 csum_partial((void *)pim, sizeof(*pim), 0)) &&
644 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
647 /* check if the inner packet is destined to mcast group */
648 encap = (struct ipv6hdr *)(skb_transport_header(skb) +
651 if (!ipv6_addr_is_multicast(&encap->daddr) ||
652 encap->payload_len == 0 ||
653 ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
656 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
658 reg_vif_num = mrt->mroute_reg_vif_num;
660 read_lock(&mrt_lock);
661 if (reg_vif_num >= 0)
662 reg_dev = mrt->vif6_table[reg_vif_num].dev;
665 read_unlock(&mrt_lock);
670 skb->mac_header = skb->network_header;
671 skb_pull(skb, (u8 *)encap - skb->data);
672 skb_reset_network_header(skb);
673 skb->protocol = htons(ETH_P_IPV6);
674 skb->ip_summed = CHECKSUM_NONE;
676 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
687 static const struct inet6_protocol pim6_protocol = {
691 /* Service routines creating virtual interfaces: PIMREG */
693 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
694 struct net_device *dev)
696 struct net *net = dev_net(dev);
697 struct mr6_table *mrt;
698 struct flowi6 fl6 = {
699 .flowi6_oif = dev->ifindex,
700 .flowi6_iif = skb->skb_iif,
701 .flowi6_mark = skb->mark,
705 err = ip6mr_fib_lookup(net, &fl6, &mrt);
711 read_lock(&mrt_lock);
712 dev->stats.tx_bytes += skb->len;
713 dev->stats.tx_packets++;
714 ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
715 read_unlock(&mrt_lock);
720 static const struct net_device_ops reg_vif_netdev_ops = {
721 .ndo_start_xmit = reg_vif_xmit,
724 static void reg_vif_setup(struct net_device *dev)
726 dev->type = ARPHRD_PIMREG;
727 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
728 dev->flags = IFF_NOARP;
729 dev->netdev_ops = ®_vif_netdev_ops;
730 dev->destructor = free_netdev;
731 dev->features |= NETIF_F_NETNS_LOCAL;
734 static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt)
736 struct net_device *dev;
739 if (mrt->id == RT6_TABLE_DFLT)
740 sprintf(name, "pim6reg");
742 sprintf(name, "pim6reg%u", mrt->id);
744 dev = alloc_netdev(0, name, reg_vif_setup);
748 dev_net_set(dev, net);
750 if (register_netdevice(dev)) {
763 /* allow the register to be completed before unregistering. */
767 unregister_netdevice(dev);
776 static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head)
778 struct mif_device *v;
779 struct net_device *dev;
780 struct inet6_dev *in6_dev;
782 if (vifi < 0 || vifi >= mrt->maxvif)
783 return -EADDRNOTAVAIL;
785 v = &mrt->vif6_table[vifi];
787 write_lock_bh(&mrt_lock);
792 write_unlock_bh(&mrt_lock);
793 return -EADDRNOTAVAIL;
796 #ifdef CONFIG_IPV6_PIMSM_V2
797 if (vifi == mrt->mroute_reg_vif_num)
798 mrt->mroute_reg_vif_num = -1;
801 if (vifi + 1 == mrt->maxvif) {
803 for (tmp = vifi - 1; tmp >= 0; tmp--) {
804 if (MIF_EXISTS(mrt, tmp))
807 mrt->maxvif = tmp + 1;
810 write_unlock_bh(&mrt_lock);
812 dev_set_allmulti(dev, -1);
814 in6_dev = __in6_dev_get(dev);
816 in6_dev->cnf.mc_forwarding--;
817 inet6_netconf_notify_devconf(dev_net(dev),
818 NETCONFA_MC_FORWARDING,
819 dev->ifindex, &in6_dev->cnf);
822 if (v->flags & MIFF_REGISTER)
823 unregister_netdevice_queue(dev, head);
829 static inline void ip6mr_cache_free(struct mfc6_cache *c)
831 kmem_cache_free(mrt_cachep, c);
834 /* Destroy an unresolved cache entry, killing queued skbs
835 and reporting error to netlink readers.
838 static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c)
840 struct net *net = read_pnet(&mrt->net);
843 atomic_dec(&mrt->cache_resolve_queue_len);
845 while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
846 if (ipv6_hdr(skb)->version == 0) {
847 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
848 nlh->nlmsg_type = NLMSG_ERROR;
849 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
850 skb_trim(skb, nlh->nlmsg_len);
851 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
852 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
861 /* Timer process for all the unresolved queue. */
863 static void ipmr_do_expire_process(struct mr6_table *mrt)
865 unsigned long now = jiffies;
866 unsigned long expires = 10 * HZ;
867 struct mfc6_cache *c, *next;
869 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
870 if (time_after(c->mfc_un.unres.expires, now)) {
872 unsigned long interval = c->mfc_un.unres.expires - now;
873 if (interval < expires)
879 mr6_netlink_event(mrt, c, RTM_DELROUTE);
880 ip6mr_destroy_unres(mrt, c);
883 if (!list_empty(&mrt->mfc6_unres_queue))
884 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
887 static void ipmr_expire_process(unsigned long arg)
889 struct mr6_table *mrt = (struct mr6_table *)arg;
891 if (!spin_trylock(&mfc_unres_lock)) {
892 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
896 if (!list_empty(&mrt->mfc6_unres_queue))
897 ipmr_do_expire_process(mrt);
899 spin_unlock(&mfc_unres_lock);
902 /* Fill oifs list. It is called under write locked mrt_lock. */
904 static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache,
909 cache->mfc_un.res.minvif = MAXMIFS;
910 cache->mfc_un.res.maxvif = 0;
911 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
913 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
914 if (MIF_EXISTS(mrt, vifi) &&
915 ttls[vifi] && ttls[vifi] < 255) {
916 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
917 if (cache->mfc_un.res.minvif > vifi)
918 cache->mfc_un.res.minvif = vifi;
919 if (cache->mfc_un.res.maxvif <= vifi)
920 cache->mfc_un.res.maxvif = vifi + 1;
925 static int mif6_add(struct net *net, struct mr6_table *mrt,
926 struct mif6ctl *vifc, int mrtsock)
928 int vifi = vifc->mif6c_mifi;
929 struct mif_device *v = &mrt->vif6_table[vifi];
930 struct net_device *dev;
931 struct inet6_dev *in6_dev;
935 if (MIF_EXISTS(mrt, vifi))
938 switch (vifc->mif6c_flags) {
939 #ifdef CONFIG_IPV6_PIMSM_V2
942 * Special Purpose VIF in PIM
943 * All the packets will be sent to the daemon
945 if (mrt->mroute_reg_vif_num >= 0)
947 dev = ip6mr_reg_vif(net, mrt);
950 err = dev_set_allmulti(dev, 1);
952 unregister_netdevice(dev);
959 dev = dev_get_by_index(net, vifc->mif6c_pifi);
961 return -EADDRNOTAVAIL;
962 err = dev_set_allmulti(dev, 1);
972 in6_dev = __in6_dev_get(dev);
974 in6_dev->cnf.mc_forwarding++;
975 inet6_netconf_notify_devconf(dev_net(dev),
976 NETCONFA_MC_FORWARDING,
977 dev->ifindex, &in6_dev->cnf);
981 * Fill in the VIF structures
983 v->rate_limit = vifc->vifc_rate_limit;
984 v->flags = vifc->mif6c_flags;
986 v->flags |= VIFF_STATIC;
987 v->threshold = vifc->vifc_threshold;
992 v->link = dev->ifindex;
993 if (v->flags & MIFF_REGISTER)
994 v->link = dev->iflink;
996 /* And finish update writing critical data */
997 write_lock_bh(&mrt_lock);
999 #ifdef CONFIG_IPV6_PIMSM_V2
1000 if (v->flags & MIFF_REGISTER)
1001 mrt->mroute_reg_vif_num = vifi;
1003 if (vifi + 1 > mrt->maxvif)
1004 mrt->maxvif = vifi + 1;
1005 write_unlock_bh(&mrt_lock);
1009 static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt,
1010 const struct in6_addr *origin,
1011 const struct in6_addr *mcastgrp)
1013 int line = MFC6_HASH(mcastgrp, origin);
1014 struct mfc6_cache *c;
1016 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1017 if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
1018 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
1024 /* Look for a (*,*,oif) entry */
1025 static struct mfc6_cache *ip6mr_cache_find_any_parent(struct mr6_table *mrt,
1028 int line = MFC6_HASH(&in6addr_any, &in6addr_any);
1029 struct mfc6_cache *c;
1031 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
1032 if (ipv6_addr_any(&c->mf6c_origin) &&
1033 ipv6_addr_any(&c->mf6c_mcastgrp) &&
1034 (c->mfc_un.res.ttls[mifi] < 255))
1040 /* Look for a (*,G) entry */
1041 static struct mfc6_cache *ip6mr_cache_find_any(struct mr6_table *mrt,
1042 struct in6_addr *mcastgrp,
1045 int line = MFC6_HASH(mcastgrp, &in6addr_any);
1046 struct mfc6_cache *c, *proxy;
1048 if (ipv6_addr_any(mcastgrp))
1051 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
1052 if (ipv6_addr_any(&c->mf6c_origin) &&
1053 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) {
1054 if (c->mfc_un.res.ttls[mifi] < 255)
1057 /* It's ok if the mifi is part of the static tree */
1058 proxy = ip6mr_cache_find_any_parent(mrt,
1060 if (proxy && proxy->mfc_un.res.ttls[mifi] < 255)
1065 return ip6mr_cache_find_any_parent(mrt, mifi);
1069 * Allocate a multicast cache entry
1071 static struct mfc6_cache *ip6mr_cache_alloc(void)
1073 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
1076 c->mfc_un.res.minvif = MAXMIFS;
1080 static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
1082 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
1085 skb_queue_head_init(&c->mfc_un.unres.unresolved);
1086 c->mfc_un.unres.expires = jiffies + 10 * HZ;
1091 * A cache entry has gone into a resolved state from queued
1094 static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt,
1095 struct mfc6_cache *uc, struct mfc6_cache *c)
1097 struct sk_buff *skb;
1100 * Play the pending entries through our router
1103 while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
1104 if (ipv6_hdr(skb)->version == 0) {
1105 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
1107 if (__ip6mr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
1108 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1110 nlh->nlmsg_type = NLMSG_ERROR;
1111 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1112 skb_trim(skb, nlh->nlmsg_len);
1113 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
1115 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1117 ip6_mr_forward(net, mrt, skb, c);
1122 * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
1123 * expects the following bizarre scheme.
1125 * Called under mrt_lock.
1128 static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
1129 mifi_t mifi, int assert)
1131 struct sk_buff *skb;
1132 struct mrt6msg *msg;
1135 #ifdef CONFIG_IPV6_PIMSM_V2
1136 if (assert == MRT6MSG_WHOLEPKT)
1137 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1141 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1146 /* I suppose that internal messages
1147 * do not require checksums */
1149 skb->ip_summed = CHECKSUM_UNNECESSARY;
1151 #ifdef CONFIG_IPV6_PIMSM_V2
1152 if (assert == MRT6MSG_WHOLEPKT) {
1153 /* Ugly, but we have no choice with this interface.
1154 Duplicate old header, fix length etc.
1155 And all this only to mangle msg->im6_msgtype and
1156 to set msg->im6_mbz to "mbz" :-)
1158 skb_push(skb, -skb_network_offset(pkt));
1160 skb_push(skb, sizeof(*msg));
1161 skb_reset_transport_header(skb);
1162 msg = (struct mrt6msg *)skb_transport_header(skb);
1164 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
1165 msg->im6_mif = mrt->mroute_reg_vif_num;
1167 msg->im6_src = ipv6_hdr(pkt)->saddr;
1168 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1170 skb->ip_summed = CHECKSUM_UNNECESSARY;
1175 * Copy the IP header
1178 skb_put(skb, sizeof(struct ipv6hdr));
1179 skb_reset_network_header(skb);
1180 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1185 skb_put(skb, sizeof(*msg));
1186 skb_reset_transport_header(skb);
1187 msg = (struct mrt6msg *)skb_transport_header(skb);
1190 msg->im6_msgtype = assert;
1191 msg->im6_mif = mifi;
1193 msg->im6_src = ipv6_hdr(pkt)->saddr;
1194 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1196 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1197 skb->ip_summed = CHECKSUM_UNNECESSARY;
1200 if (mrt->mroute6_sk == NULL) {
1206 * Deliver to user space multicast routing algorithms
1208 ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb);
1210 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
1218 * Queue a packet for resolution. It gets locked cache entry!
1222 ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb)
1226 struct mfc6_cache *c;
1228 spin_lock_bh(&mfc_unres_lock);
1229 list_for_each_entry(c, &mrt->mfc6_unres_queue, list) {
1230 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1231 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1239 * Create a new entry if allowable
1242 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1243 (c = ip6mr_cache_alloc_unres()) == NULL) {
1244 spin_unlock_bh(&mfc_unres_lock);
1251 * Fill in the new cache entry
1253 c->mf6c_parent = -1;
1254 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1255 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1258 * Reflect first query at pim6sd
1260 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1262 /* If the report failed throw the cache entry
1265 spin_unlock_bh(&mfc_unres_lock);
1267 ip6mr_cache_free(c);
1272 atomic_inc(&mrt->cache_resolve_queue_len);
1273 list_add(&c->list, &mrt->mfc6_unres_queue);
1274 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1276 ipmr_do_expire_process(mrt);
1280 * See if we can append the packet
1282 if (c->mfc_un.unres.unresolved.qlen > 3) {
1286 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1290 spin_unlock_bh(&mfc_unres_lock);
1295 * MFC6 cache manipulation by user space
1298 static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc,
1302 struct mfc6_cache *c, *next;
1304 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1306 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) {
1307 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1308 ipv6_addr_equal(&c->mf6c_mcastgrp,
1309 &mfc->mf6cc_mcastgrp.sin6_addr) &&
1310 (parent == -1 || parent == c->mf6c_parent)) {
1311 write_lock_bh(&mrt_lock);
1313 write_unlock_bh(&mrt_lock);
1315 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1316 ip6mr_cache_free(c);
1323 static int ip6mr_device_event(struct notifier_block *this,
1324 unsigned long event, void *ptr)
1326 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1327 struct net *net = dev_net(dev);
1328 struct mr6_table *mrt;
1329 struct mif_device *v;
1333 if (event != NETDEV_UNREGISTER)
1336 ip6mr_for_each_table(mrt, net) {
1337 v = &mrt->vif6_table[0];
1338 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1340 mif6_delete(mrt, ct, &list);
1343 unregister_netdevice_many(&list);
1348 static struct notifier_block ip6_mr_notifier = {
1349 .notifier_call = ip6mr_device_event
1353 * Setup for IP multicast routing
1356 static int __net_init ip6mr_net_init(struct net *net)
1360 err = ip6mr_rules_init(net);
1364 #ifdef CONFIG_PROC_FS
1366 if (!proc_create("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_fops))
1368 if (!proc_create("ip6_mr_cache", 0, net->proc_net, &ip6mr_mfc_fops))
1369 goto proc_cache_fail;
1374 #ifdef CONFIG_PROC_FS
1376 remove_proc_entry("ip6_mr_vif", net->proc_net);
1378 ip6mr_rules_exit(net);
1384 static void __net_exit ip6mr_net_exit(struct net *net)
1386 #ifdef CONFIG_PROC_FS
1387 remove_proc_entry("ip6_mr_cache", net->proc_net);
1388 remove_proc_entry("ip6_mr_vif", net->proc_net);
1390 ip6mr_rules_exit(net);
1393 static struct pernet_operations ip6mr_net_ops = {
1394 .init = ip6mr_net_init,
1395 .exit = ip6mr_net_exit,
1398 int __init ip6_mr_init(void)
1402 mrt_cachep = kmem_cache_create("ip6_mrt_cache",
1403 sizeof(struct mfc6_cache),
1404 0, SLAB_HWCACHE_ALIGN,
1409 err = register_pernet_subsys(&ip6mr_net_ops);
1411 goto reg_pernet_fail;
1413 err = register_netdevice_notifier(&ip6_mr_notifier);
1415 goto reg_notif_fail;
1416 #ifdef CONFIG_IPV6_PIMSM_V2
1417 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1418 pr_err("%s: can't add PIM protocol\n", __func__);
1420 goto add_proto_fail;
1423 rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL,
1424 ip6mr_rtm_dumproute, NULL);
1426 #ifdef CONFIG_IPV6_PIMSM_V2
1428 unregister_netdevice_notifier(&ip6_mr_notifier);
1431 unregister_pernet_subsys(&ip6mr_net_ops);
1433 kmem_cache_destroy(mrt_cachep);
1437 void ip6_mr_cleanup(void)
1439 unregister_netdevice_notifier(&ip6_mr_notifier);
1440 unregister_pernet_subsys(&ip6mr_net_ops);
1441 kmem_cache_destroy(mrt_cachep);
1444 static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt,
1445 struct mf6cctl *mfc, int mrtsock, int parent)
1449 struct mfc6_cache *uc, *c;
1450 unsigned char ttls[MAXMIFS];
1453 if (mfc->mf6cc_parent >= MAXMIFS)
1456 memset(ttls, 255, MAXMIFS);
1457 for (i = 0; i < MAXMIFS; i++) {
1458 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1463 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1465 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1466 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1467 ipv6_addr_equal(&c->mf6c_mcastgrp,
1468 &mfc->mf6cc_mcastgrp.sin6_addr) &&
1469 (parent == -1 || parent == mfc->mf6cc_parent)) {
1476 write_lock_bh(&mrt_lock);
1477 c->mf6c_parent = mfc->mf6cc_parent;
1478 ip6mr_update_thresholds(mrt, c, ttls);
1480 c->mfc_flags |= MFC_STATIC;
1481 write_unlock_bh(&mrt_lock);
1482 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1486 if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
1487 !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1490 c = ip6mr_cache_alloc();
1494 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1495 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1496 c->mf6c_parent = mfc->mf6cc_parent;
1497 ip6mr_update_thresholds(mrt, c, ttls);
1499 c->mfc_flags |= MFC_STATIC;
1501 write_lock_bh(&mrt_lock);
1502 list_add(&c->list, &mrt->mfc6_cache_array[line]);
1503 write_unlock_bh(&mrt_lock);
1506 * Check to see if we resolved a queued list. If so we
1507 * need to send on the frames and tidy up.
1510 spin_lock_bh(&mfc_unres_lock);
1511 list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) {
1512 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1513 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1514 list_del(&uc->list);
1515 atomic_dec(&mrt->cache_resolve_queue_len);
1520 if (list_empty(&mrt->mfc6_unres_queue))
1521 del_timer(&mrt->ipmr_expire_timer);
1522 spin_unlock_bh(&mfc_unres_lock);
1525 ip6mr_cache_resolve(net, mrt, uc, c);
1526 ip6mr_cache_free(uc);
1528 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1533 * Close the multicast socket, and clear the vif tables etc
1536 static void mroute_clean_tables(struct mr6_table *mrt)
1540 struct mfc6_cache *c, *next;
1543 * Shut down all active vif entries
1545 for (i = 0; i < mrt->maxvif; i++) {
1546 if (!(mrt->vif6_table[i].flags & VIFF_STATIC))
1547 mif6_delete(mrt, i, &list);
1549 unregister_netdevice_many(&list);
1554 for (i = 0; i < MFC6_LINES; i++) {
1555 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) {
1556 if (c->mfc_flags & MFC_STATIC)
1558 write_lock_bh(&mrt_lock);
1560 write_unlock_bh(&mrt_lock);
1562 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1563 ip6mr_cache_free(c);
1567 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1568 spin_lock_bh(&mfc_unres_lock);
1569 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
1571 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1572 ip6mr_destroy_unres(mrt, c);
1574 spin_unlock_bh(&mfc_unres_lock);
1578 static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk)
1581 struct net *net = sock_net(sk);
1584 write_lock_bh(&mrt_lock);
1585 if (likely(mrt->mroute6_sk == NULL)) {
1586 mrt->mroute6_sk = sk;
1587 net->ipv6.devconf_all->mc_forwarding++;
1588 inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
1589 NETCONFA_IFINDEX_ALL,
1590 net->ipv6.devconf_all);
1594 write_unlock_bh(&mrt_lock);
1601 int ip6mr_sk_done(struct sock *sk)
1604 struct net *net = sock_net(sk);
1605 struct mr6_table *mrt;
1608 ip6mr_for_each_table(mrt, net) {
1609 if (sk == mrt->mroute6_sk) {
1610 write_lock_bh(&mrt_lock);
1611 mrt->mroute6_sk = NULL;
1612 net->ipv6.devconf_all->mc_forwarding--;
1613 inet6_netconf_notify_devconf(net,
1614 NETCONFA_MC_FORWARDING,
1615 NETCONFA_IFINDEX_ALL,
1616 net->ipv6.devconf_all);
1617 write_unlock_bh(&mrt_lock);
1619 mroute_clean_tables(mrt);
1629 struct sock *mroute6_socket(struct net *net, struct sk_buff *skb)
1631 struct mr6_table *mrt;
1632 struct flowi6 fl6 = {
1633 .flowi6_iif = skb->skb_iif,
1634 .flowi6_oif = skb->dev->ifindex,
1635 .flowi6_mark = skb->mark,
1638 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1641 return mrt->mroute6_sk;
1645 * Socket options and virtual interface manipulation. The whole
1646 * virtual interface system is a complete heap, but unfortunately
1647 * that's how BSD mrouted happens to think. Maybe one day with a proper
1648 * MOSPF/PIM router set up we can clean this up.
1651 int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1653 int ret, parent = 0;
1657 struct net *net = sock_net(sk);
1658 struct mr6_table *mrt;
1660 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1664 if (optname != MRT6_INIT) {
1665 if (sk != mrt->mroute6_sk && !ns_capable(net->user_ns, CAP_NET_ADMIN))
1671 if (sk->sk_type != SOCK_RAW ||
1672 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1674 if (optlen < sizeof(int))
1677 return ip6mr_sk_init(mrt, sk);
1680 return ip6mr_sk_done(sk);
1683 if (optlen < sizeof(vif))
1685 if (copy_from_user(&vif, optval, sizeof(vif)))
1687 if (vif.mif6c_mifi >= MAXMIFS)
1690 ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk);
1695 if (optlen < sizeof(mifi_t))
1697 if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
1700 ret = mif6_delete(mrt, mifi, NULL);
1705 * Manipulate the forwarding caches. These live
1706 * in a sort of kernel/user symbiosis.
1711 case MRT6_ADD_MFC_PROXY:
1712 case MRT6_DEL_MFC_PROXY:
1713 if (optlen < sizeof(mfc))
1715 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1718 parent = mfc.mf6cc_parent;
1720 if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
1721 ret = ip6mr_mfc_delete(mrt, &mfc, parent);
1723 ret = ip6mr_mfc_add(net, mrt, &mfc,
1724 sk == mrt->mroute6_sk, parent);
1729 * Control PIM assert (to activate pim will activate assert)
1735 if (optlen != sizeof(v))
1737 if (get_user(v, (int __user *)optval))
1739 mrt->mroute_do_assert = v;
1743 #ifdef CONFIG_IPV6_PIMSM_V2
1748 if (optlen != sizeof(v))
1750 if (get_user(v, (int __user *)optval))
1755 if (v != mrt->mroute_do_pim) {
1756 mrt->mroute_do_pim = v;
1757 mrt->mroute_do_assert = v;
1764 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1769 if (optlen != sizeof(u32))
1771 if (get_user(v, (u32 __user *)optval))
1773 /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
1774 if (v != RT_TABLE_DEFAULT && v >= 100000000)
1776 if (sk == mrt->mroute6_sk)
1781 if (!ip6mr_new_table(net, v))
1783 raw6_sk(sk)->ip6mr_table = v;
1789 * Spurious command, or MRT6_VERSION which you cannot
1793 return -ENOPROTOOPT;
1798 * Getsock opt support for the multicast routing system.
1801 int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1806 struct net *net = sock_net(sk);
1807 struct mr6_table *mrt;
1809 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1817 #ifdef CONFIG_IPV6_PIMSM_V2
1819 val = mrt->mroute_do_pim;
1823 val = mrt->mroute_do_assert;
1826 return -ENOPROTOOPT;
1829 if (get_user(olr, optlen))
1832 olr = min_t(int, olr, sizeof(int));
1836 if (put_user(olr, optlen))
1838 if (copy_to_user(optval, &val, olr))
1844 * The IP multicast ioctl support routines.
1847 int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1849 struct sioc_sg_req6 sr;
1850 struct sioc_mif_req6 vr;
1851 struct mif_device *vif;
1852 struct mfc6_cache *c;
1853 struct net *net = sock_net(sk);
1854 struct mr6_table *mrt;
1856 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1861 case SIOCGETMIFCNT_IN6:
1862 if (copy_from_user(&vr, arg, sizeof(vr)))
1864 if (vr.mifi >= mrt->maxvif)
1866 read_lock(&mrt_lock);
1867 vif = &mrt->vif6_table[vr.mifi];
1868 if (MIF_EXISTS(mrt, vr.mifi)) {
1869 vr.icount = vif->pkt_in;
1870 vr.ocount = vif->pkt_out;
1871 vr.ibytes = vif->bytes_in;
1872 vr.obytes = vif->bytes_out;
1873 read_unlock(&mrt_lock);
1875 if (copy_to_user(arg, &vr, sizeof(vr)))
1879 read_unlock(&mrt_lock);
1880 return -EADDRNOTAVAIL;
1881 case SIOCGETSGCNT_IN6:
1882 if (copy_from_user(&sr, arg, sizeof(sr)))
1885 read_lock(&mrt_lock);
1886 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1888 sr.pktcnt = c->mfc_un.res.pkt;
1889 sr.bytecnt = c->mfc_un.res.bytes;
1890 sr.wrong_if = c->mfc_un.res.wrong_if;
1891 read_unlock(&mrt_lock);
1893 if (copy_to_user(arg, &sr, sizeof(sr)))
1897 read_unlock(&mrt_lock);
1898 return -EADDRNOTAVAIL;
1900 return -ENOIOCTLCMD;
1904 #ifdef CONFIG_COMPAT
1905 struct compat_sioc_sg_req6 {
1906 struct sockaddr_in6 src;
1907 struct sockaddr_in6 grp;
1908 compat_ulong_t pktcnt;
1909 compat_ulong_t bytecnt;
1910 compat_ulong_t wrong_if;
1913 struct compat_sioc_mif_req6 {
1915 compat_ulong_t icount;
1916 compat_ulong_t ocount;
1917 compat_ulong_t ibytes;
1918 compat_ulong_t obytes;
1921 int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1923 struct compat_sioc_sg_req6 sr;
1924 struct compat_sioc_mif_req6 vr;
1925 struct mif_device *vif;
1926 struct mfc6_cache *c;
1927 struct net *net = sock_net(sk);
1928 struct mr6_table *mrt;
1930 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1935 case SIOCGETMIFCNT_IN6:
1936 if (copy_from_user(&vr, arg, sizeof(vr)))
1938 if (vr.mifi >= mrt->maxvif)
1940 read_lock(&mrt_lock);
1941 vif = &mrt->vif6_table[vr.mifi];
1942 if (MIF_EXISTS(mrt, vr.mifi)) {
1943 vr.icount = vif->pkt_in;
1944 vr.ocount = vif->pkt_out;
1945 vr.ibytes = vif->bytes_in;
1946 vr.obytes = vif->bytes_out;
1947 read_unlock(&mrt_lock);
1949 if (copy_to_user(arg, &vr, sizeof(vr)))
1953 read_unlock(&mrt_lock);
1954 return -EADDRNOTAVAIL;
1955 case SIOCGETSGCNT_IN6:
1956 if (copy_from_user(&sr, arg, sizeof(sr)))
1959 read_lock(&mrt_lock);
1960 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1962 sr.pktcnt = c->mfc_un.res.pkt;
1963 sr.bytecnt = c->mfc_un.res.bytes;
1964 sr.wrong_if = c->mfc_un.res.wrong_if;
1965 read_unlock(&mrt_lock);
1967 if (copy_to_user(arg, &sr, sizeof(sr)))
1971 read_unlock(&mrt_lock);
1972 return -EADDRNOTAVAIL;
1974 return -ENOIOCTLCMD;
1979 static inline int ip6mr_forward2_finish(struct sk_buff *skb)
1981 IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
1982 IPSTATS_MIB_OUTFORWDATAGRAMS);
1983 IP6_ADD_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
1984 IPSTATS_MIB_OUTOCTETS, skb->len);
1985 return dst_output(skb);
1989 * Processing handlers for ip6mr_forward
1992 static int ip6mr_forward2(struct net *net, struct mr6_table *mrt,
1993 struct sk_buff *skb, struct mfc6_cache *c, int vifi)
1995 struct ipv6hdr *ipv6h;
1996 struct mif_device *vif = &mrt->vif6_table[vifi];
1997 struct net_device *dev;
1998 struct dst_entry *dst;
2001 if (vif->dev == NULL)
2004 #ifdef CONFIG_IPV6_PIMSM_V2
2005 if (vif->flags & MIFF_REGISTER) {
2007 vif->bytes_out += skb->len;
2008 vif->dev->stats.tx_bytes += skb->len;
2009 vif->dev->stats.tx_packets++;
2010 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
2015 ipv6h = ipv6_hdr(skb);
2017 fl6 = (struct flowi6) {
2018 .flowi6_oif = vif->link,
2019 .daddr = ipv6h->daddr,
2022 dst = ip6_route_output(net, NULL, &fl6);
2029 skb_dst_set(skb, dst);
2032 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
2033 * not only before forwarding, but after forwarding on all output
2034 * interfaces. It is clear, if mrouter runs a multicasting
2035 * program, it should receive packets not depending to what interface
2036 * program is joined.
2037 * If we will not make it, the program will have to join on all
2038 * interfaces. On the other hand, multihoming host (or router, but
2039 * not mrouter) cannot join to more than one interface - it will
2040 * result in receiving multiple packets.
2045 vif->bytes_out += skb->len;
2047 /* We are about to write */
2048 /* XXX: extension headers? */
2049 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
2052 ipv6h = ipv6_hdr(skb);
2055 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
2057 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dev,
2058 ip6mr_forward2_finish);
2065 static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev)
2069 for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
2070 if (mrt->vif6_table[ct].dev == dev)
2076 static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
2077 struct sk_buff *skb, struct mfc6_cache *cache)
2081 int true_vifi = ip6mr_find_vif(mrt, skb->dev);
2083 vif = cache->mf6c_parent;
2084 cache->mfc_un.res.pkt++;
2085 cache->mfc_un.res.bytes += skb->len;
2087 if (ipv6_addr_any(&cache->mf6c_origin) && true_vifi >= 0) {
2088 struct mfc6_cache *cache_proxy;
2090 /* For an (*,G) entry, we only check that the incomming
2091 * interface is part of the static tree.
2093 cache_proxy = ip6mr_cache_find_any_parent(mrt, vif);
2095 cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
2100 * Wrong interface: drop packet and (maybe) send PIM assert.
2102 if (mrt->vif6_table[vif].dev != skb->dev) {
2103 cache->mfc_un.res.wrong_if++;
2105 if (true_vifi >= 0 && mrt->mroute_do_assert &&
2106 /* pimsm uses asserts, when switching from RPT to SPT,
2107 so that we cannot check that packet arrived on an oif.
2108 It is bad, but otherwise we would need to move pretty
2109 large chunk of pimd to kernel. Ough... --ANK
2111 (mrt->mroute_do_pim ||
2112 cache->mfc_un.res.ttls[true_vifi] < 255) &&
2114 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
2115 cache->mfc_un.res.last_assert = jiffies;
2116 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2122 mrt->vif6_table[vif].pkt_in++;
2123 mrt->vif6_table[vif].bytes_in += skb->len;
2128 if (ipv6_addr_any(&cache->mf6c_origin) &&
2129 ipv6_addr_any(&cache->mf6c_mcastgrp)) {
2130 if (true_vifi >= 0 &&
2131 true_vifi != cache->mf6c_parent &&
2132 ipv6_hdr(skb)->hop_limit >
2133 cache->mfc_un.res.ttls[cache->mf6c_parent]) {
2134 /* It's an (*,*) entry and the packet is not coming from
2135 * the upstream: forward the packet to the upstream
2138 psend = cache->mf6c_parent;
2143 for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
2144 /* For (*,G) entry, don't forward to the incoming interface */
2145 if ((!ipv6_addr_any(&cache->mf6c_origin) || ct != true_vifi) &&
2146 ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
2148 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2150 ip6mr_forward2(net, mrt, skb2, cache, psend);
2157 ip6mr_forward2(net, mrt, skb, cache, psend);
2167 * Multicast packets for forwarding arrive here
2170 int ip6_mr_input(struct sk_buff *skb)
2172 struct mfc6_cache *cache;
2173 struct net *net = dev_net(skb->dev);
2174 struct mr6_table *mrt;
2175 struct flowi6 fl6 = {
2176 .flowi6_iif = skb->dev->ifindex,
2177 .flowi6_mark = skb->mark,
2181 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2187 read_lock(&mrt_lock);
2188 cache = ip6mr_cache_find(mrt,
2189 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2190 if (cache == NULL) {
2191 int vif = ip6mr_find_vif(mrt, skb->dev);
2194 cache = ip6mr_cache_find_any(mrt,
2195 &ipv6_hdr(skb)->daddr,
2200 * No usable cache entry
2202 if (cache == NULL) {
2205 vif = ip6mr_find_vif(mrt, skb->dev);
2207 int err = ip6mr_cache_unresolved(mrt, vif, skb);
2208 read_unlock(&mrt_lock);
2212 read_unlock(&mrt_lock);
2217 ip6_mr_forward(net, mrt, skb, cache);
2219 read_unlock(&mrt_lock);
2225 static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2226 struct mfc6_cache *c, struct rtmsg *rtm)
2229 struct rtnexthop *nhp;
2230 struct nlattr *mp_attr;
2231 struct rta_mfc_stats mfcs;
2233 /* If cache is unresolved, don't try to parse IIF and OIF */
2234 if (c->mf6c_parent >= MAXMIFS)
2237 if (MIF_EXISTS(mrt, c->mf6c_parent) &&
2238 nla_put_u32(skb, RTA_IIF, mrt->vif6_table[c->mf6c_parent].dev->ifindex) < 0)
2240 mp_attr = nla_nest_start(skb, RTA_MULTIPATH);
2241 if (mp_attr == NULL)
2244 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2245 if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2246 nhp = nla_reserve_nohdr(skb, sizeof(*nhp));
2248 nla_nest_cancel(skb, mp_attr);
2252 nhp->rtnh_flags = 0;
2253 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2254 nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex;
2255 nhp->rtnh_len = sizeof(*nhp);
2259 nla_nest_end(skb, mp_attr);
2261 mfcs.mfcs_packets = c->mfc_un.res.pkt;
2262 mfcs.mfcs_bytes = c->mfc_un.res.bytes;
2263 mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
2264 if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0)
2267 rtm->rtm_type = RTN_MULTICAST;
2271 int ip6mr_get_route(struct net *net,
2272 struct sk_buff *skb, struct rtmsg *rtm, int nowait)
2275 struct mr6_table *mrt;
2276 struct mfc6_cache *cache;
2277 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
2279 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2283 read_lock(&mrt_lock);
2284 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2285 if (!cache && skb->dev) {
2286 int vif = ip6mr_find_vif(mrt, skb->dev);
2289 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
2294 struct sk_buff *skb2;
2295 struct ipv6hdr *iph;
2296 struct net_device *dev;
2300 read_unlock(&mrt_lock);
2305 if (dev == NULL || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2306 read_unlock(&mrt_lock);
2310 /* really correct? */
2311 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2313 read_unlock(&mrt_lock);
2317 skb_reset_transport_header(skb2);
2319 skb_put(skb2, sizeof(struct ipv6hdr));
2320 skb_reset_network_header(skb2);
2322 iph = ipv6_hdr(skb2);
2325 iph->flow_lbl[0] = 0;
2326 iph->flow_lbl[1] = 0;
2327 iph->flow_lbl[2] = 0;
2328 iph->payload_len = 0;
2329 iph->nexthdr = IPPROTO_NONE;
2331 iph->saddr = rt->rt6i_src.addr;
2332 iph->daddr = rt->rt6i_dst.addr;
2334 err = ip6mr_cache_unresolved(mrt, vif, skb2);
2335 read_unlock(&mrt_lock);
2340 if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
2341 cache->mfc_flags |= MFC_NOTIFY;
2343 err = __ip6mr_fill_mroute(mrt, skb, cache, rtm);
2344 read_unlock(&mrt_lock);
2348 static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2349 u32 portid, u32 seq, struct mfc6_cache *c, int cmd)
2351 struct nlmsghdr *nlh;
2355 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), NLM_F_MULTI);
2359 rtm = nlmsg_data(nlh);
2360 rtm->rtm_family = RTNL_FAMILY_IP6MR;
2361 rtm->rtm_dst_len = 128;
2362 rtm->rtm_src_len = 128;
2364 rtm->rtm_table = mrt->id;
2365 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2366 goto nla_put_failure;
2367 rtm->rtm_type = RTN_MULTICAST;
2368 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2369 if (c->mfc_flags & MFC_STATIC)
2370 rtm->rtm_protocol = RTPROT_STATIC;
2372 rtm->rtm_protocol = RTPROT_MROUTED;
2375 if (nla_put(skb, RTA_SRC, 16, &c->mf6c_origin) ||
2376 nla_put(skb, RTA_DST, 16, &c->mf6c_mcastgrp))
2377 goto nla_put_failure;
2378 err = __ip6mr_fill_mroute(mrt, skb, c, rtm);
2379 /* do not break the dump if cache is unresolved */
2380 if (err < 0 && err != -ENOENT)
2381 goto nla_put_failure;
2383 return nlmsg_end(skb, nlh);
2386 nlmsg_cancel(skb, nlh);
2390 static int mr6_msgsize(bool unresolved, int maxvif)
2393 NLMSG_ALIGN(sizeof(struct rtmsg))
2394 + nla_total_size(4) /* RTA_TABLE */
2395 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
2396 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
2401 + nla_total_size(4) /* RTA_IIF */
2402 + nla_total_size(0) /* RTA_MULTIPATH */
2403 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2405 + nla_total_size(sizeof(struct rta_mfc_stats))
2411 static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
2414 struct net *net = read_pnet(&mrt->net);
2415 struct sk_buff *skb;
2418 skb = nlmsg_new(mr6_msgsize(mfc->mf6c_parent >= MAXMIFS, mrt->maxvif),
2423 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd);
2427 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
2433 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
2436 static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2438 struct net *net = sock_net(skb->sk);
2439 struct mr6_table *mrt;
2440 struct mfc6_cache *mfc;
2441 unsigned int t = 0, s_t;
2442 unsigned int h = 0, s_h;
2443 unsigned int e = 0, s_e;
2449 read_lock(&mrt_lock);
2450 ip6mr_for_each_table(mrt, net) {
2455 for (h = s_h; h < MFC6_LINES; h++) {
2456 list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) {
2459 if (ip6mr_fill_mroute(mrt, skb,
2460 NETLINK_CB(cb->skb).portid,
2462 mfc, RTM_NEWROUTE) < 0)
2469 spin_lock_bh(&mfc_unres_lock);
2470 list_for_each_entry(mfc, &mrt->mfc6_unres_queue, list) {
2473 if (ip6mr_fill_mroute(mrt, skb,
2474 NETLINK_CB(cb->skb).portid,
2476 mfc, RTM_NEWROUTE) < 0) {
2477 spin_unlock_bh(&mfc_unres_lock);
2483 spin_unlock_bh(&mfc_unres_lock);
2490 read_unlock(&mrt_lock);