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 int 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;
262 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
263 list_del(&mrt->list);
264 ip6mr_free_table(mrt);
266 fib_rules_unregister(net->ipv6.mr6_rules_ops);
269 #define ip6mr_for_each_table(mrt, net) \
270 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
272 static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
274 return net->ipv6.mrt6;
277 static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
278 struct mr6_table **mrt)
280 *mrt = net->ipv6.mrt6;
284 static int __net_init ip6mr_rules_init(struct net *net)
286 net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT);
287 return net->ipv6.mrt6 ? 0 : -ENOMEM;
290 static void __net_exit ip6mr_rules_exit(struct net *net)
292 ip6mr_free_table(net->ipv6.mrt6);
296 static struct mr6_table *ip6mr_new_table(struct net *net, u32 id)
298 struct mr6_table *mrt;
301 mrt = ip6mr_get_table(net, id);
305 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
309 write_pnet(&mrt->net, net);
311 /* Forwarding cache */
312 for (i = 0; i < MFC6_LINES; i++)
313 INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]);
315 INIT_LIST_HEAD(&mrt->mfc6_unres_queue);
317 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
320 #ifdef CONFIG_IPV6_PIMSM_V2
321 mrt->mroute_reg_vif_num = -1;
323 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
324 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
329 static void ip6mr_free_table(struct mr6_table *mrt)
331 del_timer(&mrt->ipmr_expire_timer);
332 mroute_clean_tables(mrt);
336 #ifdef CONFIG_PROC_FS
338 struct ipmr_mfc_iter {
339 struct seq_net_private p;
340 struct mr6_table *mrt;
341 struct list_head *cache;
346 static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net,
347 struct ipmr_mfc_iter *it, loff_t pos)
349 struct mr6_table *mrt = it->mrt;
350 struct mfc6_cache *mfc;
352 read_lock(&mrt_lock);
353 for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) {
354 it->cache = &mrt->mfc6_cache_array[it->ct];
355 list_for_each_entry(mfc, it->cache, list)
359 read_unlock(&mrt_lock);
361 spin_lock_bh(&mfc_unres_lock);
362 it->cache = &mrt->mfc6_unres_queue;
363 list_for_each_entry(mfc, it->cache, list)
366 spin_unlock_bh(&mfc_unres_lock);
373 * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif
376 struct ipmr_vif_iter {
377 struct seq_net_private p;
378 struct mr6_table *mrt;
382 static struct mif_device *ip6mr_vif_seq_idx(struct net *net,
383 struct ipmr_vif_iter *iter,
386 struct mr6_table *mrt = iter->mrt;
388 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
389 if (!MIF_EXISTS(mrt, iter->ct))
392 return &mrt->vif6_table[iter->ct];
397 static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
400 struct ipmr_vif_iter *iter = seq->private;
401 struct net *net = seq_file_net(seq);
402 struct mr6_table *mrt;
404 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
406 return ERR_PTR(-ENOENT);
410 read_lock(&mrt_lock);
411 return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1)
415 static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
417 struct ipmr_vif_iter *iter = seq->private;
418 struct net *net = seq_file_net(seq);
419 struct mr6_table *mrt = iter->mrt;
422 if (v == SEQ_START_TOKEN)
423 return ip6mr_vif_seq_idx(net, iter, 0);
425 while (++iter->ct < mrt->maxvif) {
426 if (!MIF_EXISTS(mrt, iter->ct))
428 return &mrt->vif6_table[iter->ct];
433 static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
436 read_unlock(&mrt_lock);
439 static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
441 struct ipmr_vif_iter *iter = seq->private;
442 struct mr6_table *mrt = iter->mrt;
444 if (v == SEQ_START_TOKEN) {
446 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
448 const struct mif_device *vif = v;
449 const char *name = vif->dev ? vif->dev->name : "none";
452 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
453 vif - mrt->vif6_table,
454 name, vif->bytes_in, vif->pkt_in,
455 vif->bytes_out, vif->pkt_out,
461 static const struct seq_operations ip6mr_vif_seq_ops = {
462 .start = ip6mr_vif_seq_start,
463 .next = ip6mr_vif_seq_next,
464 .stop = ip6mr_vif_seq_stop,
465 .show = ip6mr_vif_seq_show,
468 static int ip6mr_vif_open(struct inode *inode, struct file *file)
470 return seq_open_net(inode, file, &ip6mr_vif_seq_ops,
471 sizeof(struct ipmr_vif_iter));
474 static const struct file_operations ip6mr_vif_fops = {
475 .owner = THIS_MODULE,
476 .open = ip6mr_vif_open,
479 .release = seq_release_net,
482 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
484 struct ipmr_mfc_iter *it = seq->private;
485 struct net *net = seq_file_net(seq);
486 struct mr6_table *mrt;
488 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
490 return ERR_PTR(-ENOENT);
493 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
497 static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
499 struct mfc6_cache *mfc = v;
500 struct ipmr_mfc_iter *it = seq->private;
501 struct net *net = seq_file_net(seq);
502 struct mr6_table *mrt = it->mrt;
506 if (v == SEQ_START_TOKEN)
507 return ipmr_mfc_seq_idx(net, seq->private, 0);
509 if (mfc->list.next != it->cache)
510 return list_entry(mfc->list.next, struct mfc6_cache, list);
512 if (it->cache == &mrt->mfc6_unres_queue)
515 BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]);
517 while (++it->ct < MFC6_LINES) {
518 it->cache = &mrt->mfc6_cache_array[it->ct];
519 if (list_empty(it->cache))
521 return list_first_entry(it->cache, struct mfc6_cache, list);
524 /* exhausted cache_array, show unresolved */
525 read_unlock(&mrt_lock);
526 it->cache = &mrt->mfc6_unres_queue;
529 spin_lock_bh(&mfc_unres_lock);
530 if (!list_empty(it->cache))
531 return list_first_entry(it->cache, struct mfc6_cache, list);
534 spin_unlock_bh(&mfc_unres_lock);
540 static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
542 struct ipmr_mfc_iter *it = seq->private;
543 struct mr6_table *mrt = it->mrt;
545 if (it->cache == &mrt->mfc6_unres_queue)
546 spin_unlock_bh(&mfc_unres_lock);
547 else if (it->cache == mrt->mfc6_cache_array)
548 read_unlock(&mrt_lock);
551 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
555 if (v == SEQ_START_TOKEN) {
559 "Iif Pkts Bytes Wrong Oifs\n");
561 const struct mfc6_cache *mfc = v;
562 const struct ipmr_mfc_iter *it = seq->private;
563 struct mr6_table *mrt = it->mrt;
565 seq_printf(seq, "%pI6 %pI6 %-3hd",
566 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
569 if (it->cache != &mrt->mfc6_unres_queue) {
570 seq_printf(seq, " %8lu %8lu %8lu",
572 mfc->mfc_un.res.bytes,
573 mfc->mfc_un.res.wrong_if);
574 for (n = mfc->mfc_un.res.minvif;
575 n < mfc->mfc_un.res.maxvif; n++) {
576 if (MIF_EXISTS(mrt, n) &&
577 mfc->mfc_un.res.ttls[n] < 255)
580 n, mfc->mfc_un.res.ttls[n]);
583 /* unresolved mfc_caches don't contain
584 * pkt, bytes and wrong_if values
586 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
593 static const struct seq_operations ipmr_mfc_seq_ops = {
594 .start = ipmr_mfc_seq_start,
595 .next = ipmr_mfc_seq_next,
596 .stop = ipmr_mfc_seq_stop,
597 .show = ipmr_mfc_seq_show,
600 static int ipmr_mfc_open(struct inode *inode, struct file *file)
602 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
603 sizeof(struct ipmr_mfc_iter));
606 static const struct file_operations ip6mr_mfc_fops = {
607 .owner = THIS_MODULE,
608 .open = ipmr_mfc_open,
611 .release = seq_release_net,
615 #ifdef CONFIG_IPV6_PIMSM_V2
617 static int pim6_rcv(struct sk_buff *skb)
619 struct pimreghdr *pim;
620 struct ipv6hdr *encap;
621 struct net_device *reg_dev = NULL;
622 struct net *net = dev_net(skb->dev);
623 struct mr6_table *mrt;
624 struct flowi6 fl6 = {
625 .flowi6_iif = skb->dev->ifindex,
626 .flowi6_mark = skb->mark,
630 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
633 pim = (struct pimreghdr *)skb_transport_header(skb);
634 if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
635 (pim->flags & PIM_NULL_REGISTER) ||
636 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
637 sizeof(*pim), IPPROTO_PIM,
638 csum_partial((void *)pim, sizeof(*pim), 0)) &&
639 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
642 /* check if the inner packet is destined to mcast group */
643 encap = (struct ipv6hdr *)(skb_transport_header(skb) +
646 if (!ipv6_addr_is_multicast(&encap->daddr) ||
647 encap->payload_len == 0 ||
648 ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
651 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
653 reg_vif_num = mrt->mroute_reg_vif_num;
655 read_lock(&mrt_lock);
656 if (reg_vif_num >= 0)
657 reg_dev = mrt->vif6_table[reg_vif_num].dev;
660 read_unlock(&mrt_lock);
665 skb->mac_header = skb->network_header;
666 skb_pull(skb, (u8 *)encap - skb->data);
667 skb_reset_network_header(skb);
668 skb->protocol = htons(ETH_P_IPV6);
669 skb->ip_summed = CHECKSUM_NONE;
670 skb->pkt_type = PACKET_HOST;
672 skb_tunnel_rx(skb, reg_dev);
683 static const struct inet6_protocol pim6_protocol = {
687 /* Service routines creating virtual interfaces: PIMREG */
689 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
690 struct net_device *dev)
692 struct net *net = dev_net(dev);
693 struct mr6_table *mrt;
694 struct flowi6 fl6 = {
695 .flowi6_oif = dev->ifindex,
696 .flowi6_iif = skb->skb_iif,
697 .flowi6_mark = skb->mark,
701 err = ip6mr_fib_lookup(net, &fl6, &mrt);
707 read_lock(&mrt_lock);
708 dev->stats.tx_bytes += skb->len;
709 dev->stats.tx_packets++;
710 ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
711 read_unlock(&mrt_lock);
716 static const struct net_device_ops reg_vif_netdev_ops = {
717 .ndo_start_xmit = reg_vif_xmit,
720 static void reg_vif_setup(struct net_device *dev)
722 dev->type = ARPHRD_PIMREG;
723 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
724 dev->flags = IFF_NOARP;
725 dev->netdev_ops = ®_vif_netdev_ops;
726 dev->destructor = free_netdev;
727 dev->features |= NETIF_F_NETNS_LOCAL;
730 static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt)
732 struct net_device *dev;
735 if (mrt->id == RT6_TABLE_DFLT)
736 sprintf(name, "pim6reg");
738 sprintf(name, "pim6reg%u", mrt->id);
740 dev = alloc_netdev(0, name, reg_vif_setup);
744 dev_net_set(dev, net);
746 if (register_netdevice(dev)) {
759 /* allow the register to be completed before unregistering. */
763 unregister_netdevice(dev);
772 static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head)
774 struct mif_device *v;
775 struct net_device *dev;
776 struct inet6_dev *in6_dev;
778 if (vifi < 0 || vifi >= mrt->maxvif)
779 return -EADDRNOTAVAIL;
781 v = &mrt->vif6_table[vifi];
783 write_lock_bh(&mrt_lock);
788 write_unlock_bh(&mrt_lock);
789 return -EADDRNOTAVAIL;
792 #ifdef CONFIG_IPV6_PIMSM_V2
793 if (vifi == mrt->mroute_reg_vif_num)
794 mrt->mroute_reg_vif_num = -1;
797 if (vifi + 1 == mrt->maxvif) {
799 for (tmp = vifi - 1; tmp >= 0; tmp--) {
800 if (MIF_EXISTS(mrt, tmp))
803 mrt->maxvif = tmp + 1;
806 write_unlock_bh(&mrt_lock);
808 dev_set_allmulti(dev, -1);
810 in6_dev = __in6_dev_get(dev);
812 in6_dev->cnf.mc_forwarding--;
813 inet6_netconf_notify_devconf(dev_net(dev),
814 NETCONFA_MC_FORWARDING,
815 dev->ifindex, &in6_dev->cnf);
818 if (v->flags & MIFF_REGISTER)
819 unregister_netdevice_queue(dev, head);
825 static inline void ip6mr_cache_free(struct mfc6_cache *c)
827 kmem_cache_free(mrt_cachep, c);
830 /* Destroy an unresolved cache entry, killing queued skbs
831 and reporting error to netlink readers.
834 static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c)
836 struct net *net = read_pnet(&mrt->net);
839 atomic_dec(&mrt->cache_resolve_queue_len);
841 while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
842 if (ipv6_hdr(skb)->version == 0) {
843 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
844 nlh->nlmsg_type = NLMSG_ERROR;
845 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
846 skb_trim(skb, nlh->nlmsg_len);
847 ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT;
848 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
857 /* Timer process for all the unresolved queue. */
859 static void ipmr_do_expire_process(struct mr6_table *mrt)
861 unsigned long now = jiffies;
862 unsigned long expires = 10 * HZ;
863 struct mfc6_cache *c, *next;
865 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
866 if (time_after(c->mfc_un.unres.expires, now)) {
868 unsigned long interval = c->mfc_un.unres.expires - now;
869 if (interval < expires)
875 mr6_netlink_event(mrt, c, RTM_DELROUTE);
876 ip6mr_destroy_unres(mrt, c);
879 if (!list_empty(&mrt->mfc6_unres_queue))
880 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
883 static void ipmr_expire_process(unsigned long arg)
885 struct mr6_table *mrt = (struct mr6_table *)arg;
887 if (!spin_trylock(&mfc_unres_lock)) {
888 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
892 if (!list_empty(&mrt->mfc6_unres_queue))
893 ipmr_do_expire_process(mrt);
895 spin_unlock(&mfc_unres_lock);
898 /* Fill oifs list. It is called under write locked mrt_lock. */
900 static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache,
905 cache->mfc_un.res.minvif = MAXMIFS;
906 cache->mfc_un.res.maxvif = 0;
907 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
909 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
910 if (MIF_EXISTS(mrt, vifi) &&
911 ttls[vifi] && ttls[vifi] < 255) {
912 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
913 if (cache->mfc_un.res.minvif > vifi)
914 cache->mfc_un.res.minvif = vifi;
915 if (cache->mfc_un.res.maxvif <= vifi)
916 cache->mfc_un.res.maxvif = vifi + 1;
921 static int mif6_add(struct net *net, struct mr6_table *mrt,
922 struct mif6ctl *vifc, int mrtsock)
924 int vifi = vifc->mif6c_mifi;
925 struct mif_device *v = &mrt->vif6_table[vifi];
926 struct net_device *dev;
927 struct inet6_dev *in6_dev;
931 if (MIF_EXISTS(mrt, vifi))
934 switch (vifc->mif6c_flags) {
935 #ifdef CONFIG_IPV6_PIMSM_V2
938 * Special Purpose VIF in PIM
939 * All the packets will be sent to the daemon
941 if (mrt->mroute_reg_vif_num >= 0)
943 dev = ip6mr_reg_vif(net, mrt);
946 err = dev_set_allmulti(dev, 1);
948 unregister_netdevice(dev);
955 dev = dev_get_by_index(net, vifc->mif6c_pifi);
957 return -EADDRNOTAVAIL;
958 err = dev_set_allmulti(dev, 1);
968 in6_dev = __in6_dev_get(dev);
970 in6_dev->cnf.mc_forwarding++;
971 inet6_netconf_notify_devconf(dev_net(dev),
972 NETCONFA_MC_FORWARDING,
973 dev->ifindex, &in6_dev->cnf);
977 * Fill in the VIF structures
979 v->rate_limit = vifc->vifc_rate_limit;
980 v->flags = vifc->mif6c_flags;
982 v->flags |= VIFF_STATIC;
983 v->threshold = vifc->vifc_threshold;
988 v->link = dev->ifindex;
989 if (v->flags & MIFF_REGISTER)
990 v->link = dev->iflink;
992 /* And finish update writing critical data */
993 write_lock_bh(&mrt_lock);
995 #ifdef CONFIG_IPV6_PIMSM_V2
996 if (v->flags & MIFF_REGISTER)
997 mrt->mroute_reg_vif_num = vifi;
999 if (vifi + 1 > mrt->maxvif)
1000 mrt->maxvif = vifi + 1;
1001 write_unlock_bh(&mrt_lock);
1005 static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt,
1006 const struct in6_addr *origin,
1007 const struct in6_addr *mcastgrp)
1009 int line = MFC6_HASH(mcastgrp, origin);
1010 struct mfc6_cache *c;
1012 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1013 if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
1014 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
1021 * Allocate a multicast cache entry
1023 static struct mfc6_cache *ip6mr_cache_alloc(void)
1025 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
1028 c->mfc_un.res.minvif = MAXMIFS;
1032 static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
1034 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
1037 skb_queue_head_init(&c->mfc_un.unres.unresolved);
1038 c->mfc_un.unres.expires = jiffies + 10 * HZ;
1043 * A cache entry has gone into a resolved state from queued
1046 static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt,
1047 struct mfc6_cache *uc, struct mfc6_cache *c)
1049 struct sk_buff *skb;
1052 * Play the pending entries through our router
1055 while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
1056 if (ipv6_hdr(skb)->version == 0) {
1057 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
1059 if (__ip6mr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) {
1060 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1062 nlh->nlmsg_type = NLMSG_ERROR;
1063 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
1064 skb_trim(skb, nlh->nlmsg_len);
1065 ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE;
1067 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1069 ip6_mr_forward(net, mrt, skb, c);
1074 * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
1075 * expects the following bizarre scheme.
1077 * Called under mrt_lock.
1080 static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
1081 mifi_t mifi, int assert)
1083 struct sk_buff *skb;
1084 struct mrt6msg *msg;
1087 #ifdef CONFIG_IPV6_PIMSM_V2
1088 if (assert == MRT6MSG_WHOLEPKT)
1089 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1093 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1098 /* I suppose that internal messages
1099 * do not require checksums */
1101 skb->ip_summed = CHECKSUM_UNNECESSARY;
1103 #ifdef CONFIG_IPV6_PIMSM_V2
1104 if (assert == MRT6MSG_WHOLEPKT) {
1105 /* Ugly, but we have no choice with this interface.
1106 Duplicate old header, fix length etc.
1107 And all this only to mangle msg->im6_msgtype and
1108 to set msg->im6_mbz to "mbz" :-)
1110 skb_push(skb, -skb_network_offset(pkt));
1112 skb_push(skb, sizeof(*msg));
1113 skb_reset_transport_header(skb);
1114 msg = (struct mrt6msg *)skb_transport_header(skb);
1116 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
1117 msg->im6_mif = mrt->mroute_reg_vif_num;
1119 msg->im6_src = ipv6_hdr(pkt)->saddr;
1120 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1122 skb->ip_summed = CHECKSUM_UNNECESSARY;
1127 * Copy the IP header
1130 skb_put(skb, sizeof(struct ipv6hdr));
1131 skb_reset_network_header(skb);
1132 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1137 skb_put(skb, sizeof(*msg));
1138 skb_reset_transport_header(skb);
1139 msg = (struct mrt6msg *)skb_transport_header(skb);
1142 msg->im6_msgtype = assert;
1143 msg->im6_mif = mifi;
1145 msg->im6_src = ipv6_hdr(pkt)->saddr;
1146 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1148 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1149 skb->ip_summed = CHECKSUM_UNNECESSARY;
1152 if (mrt->mroute6_sk == NULL) {
1158 * Deliver to user space multicast routing algorithms
1160 ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb);
1162 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
1170 * Queue a packet for resolution. It gets locked cache entry!
1174 ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb)
1178 struct mfc6_cache *c;
1180 spin_lock_bh(&mfc_unres_lock);
1181 list_for_each_entry(c, &mrt->mfc6_unres_queue, list) {
1182 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1183 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1191 * Create a new entry if allowable
1194 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1195 (c = ip6mr_cache_alloc_unres()) == NULL) {
1196 spin_unlock_bh(&mfc_unres_lock);
1203 * Fill in the new cache entry
1205 c->mf6c_parent = -1;
1206 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1207 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1210 * Reflect first query at pim6sd
1212 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1214 /* If the report failed throw the cache entry
1217 spin_unlock_bh(&mfc_unres_lock);
1219 ip6mr_cache_free(c);
1224 atomic_inc(&mrt->cache_resolve_queue_len);
1225 list_add(&c->list, &mrt->mfc6_unres_queue);
1226 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1228 ipmr_do_expire_process(mrt);
1232 * See if we can append the packet
1234 if (c->mfc_un.unres.unresolved.qlen > 3) {
1238 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1242 spin_unlock_bh(&mfc_unres_lock);
1247 * MFC6 cache manipulation by user space
1250 static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc)
1253 struct mfc6_cache *c, *next;
1255 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1257 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) {
1258 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1259 ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) {
1260 write_lock_bh(&mrt_lock);
1262 write_unlock_bh(&mrt_lock);
1264 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1265 ip6mr_cache_free(c);
1272 static int ip6mr_device_event(struct notifier_block *this,
1273 unsigned long event, void *ptr)
1275 struct net_device *dev = ptr;
1276 struct net *net = dev_net(dev);
1277 struct mr6_table *mrt;
1278 struct mif_device *v;
1282 if (event != NETDEV_UNREGISTER)
1285 ip6mr_for_each_table(mrt, net) {
1286 v = &mrt->vif6_table[0];
1287 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1289 mif6_delete(mrt, ct, &list);
1292 unregister_netdevice_many(&list);
1297 static struct notifier_block ip6_mr_notifier = {
1298 .notifier_call = ip6mr_device_event
1302 * Setup for IP multicast routing
1305 static int __net_init ip6mr_net_init(struct net *net)
1309 err = ip6mr_rules_init(net);
1313 #ifdef CONFIG_PROC_FS
1315 if (!proc_net_fops_create(net, "ip6_mr_vif", 0, &ip6mr_vif_fops))
1317 if (!proc_net_fops_create(net, "ip6_mr_cache", 0, &ip6mr_mfc_fops))
1318 goto proc_cache_fail;
1323 #ifdef CONFIG_PROC_FS
1325 proc_net_remove(net, "ip6_mr_vif");
1327 ip6mr_rules_exit(net);
1333 static void __net_exit ip6mr_net_exit(struct net *net)
1335 #ifdef CONFIG_PROC_FS
1336 proc_net_remove(net, "ip6_mr_cache");
1337 proc_net_remove(net, "ip6_mr_vif");
1339 ip6mr_rules_exit(net);
1342 static struct pernet_operations ip6mr_net_ops = {
1343 .init = ip6mr_net_init,
1344 .exit = ip6mr_net_exit,
1347 int __init ip6_mr_init(void)
1351 mrt_cachep = kmem_cache_create("ip6_mrt_cache",
1352 sizeof(struct mfc6_cache),
1353 0, SLAB_HWCACHE_ALIGN,
1358 err = register_pernet_subsys(&ip6mr_net_ops);
1360 goto reg_pernet_fail;
1362 err = register_netdevice_notifier(&ip6_mr_notifier);
1364 goto reg_notif_fail;
1365 #ifdef CONFIG_IPV6_PIMSM_V2
1366 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1367 pr_err("%s: can't add PIM protocol\n", __func__);
1369 goto add_proto_fail;
1372 rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL,
1373 ip6mr_rtm_dumproute, NULL);
1375 #ifdef CONFIG_IPV6_PIMSM_V2
1377 unregister_netdevice_notifier(&ip6_mr_notifier);
1380 unregister_pernet_subsys(&ip6mr_net_ops);
1382 kmem_cache_destroy(mrt_cachep);
1386 void ip6_mr_cleanup(void)
1388 unregister_netdevice_notifier(&ip6_mr_notifier);
1389 unregister_pernet_subsys(&ip6mr_net_ops);
1390 kmem_cache_destroy(mrt_cachep);
1393 static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt,
1394 struct mf6cctl *mfc, int mrtsock)
1398 struct mfc6_cache *uc, *c;
1399 unsigned char ttls[MAXMIFS];
1402 if (mfc->mf6cc_parent >= MAXMIFS)
1405 memset(ttls, 255, MAXMIFS);
1406 for (i = 0; i < MAXMIFS; i++) {
1407 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1412 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1414 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
1415 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1416 ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) {
1423 write_lock_bh(&mrt_lock);
1424 c->mf6c_parent = mfc->mf6cc_parent;
1425 ip6mr_update_thresholds(mrt, c, ttls);
1427 c->mfc_flags |= MFC_STATIC;
1428 write_unlock_bh(&mrt_lock);
1429 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1433 if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1436 c = ip6mr_cache_alloc();
1440 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1441 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1442 c->mf6c_parent = mfc->mf6cc_parent;
1443 ip6mr_update_thresholds(mrt, c, ttls);
1445 c->mfc_flags |= MFC_STATIC;
1447 write_lock_bh(&mrt_lock);
1448 list_add(&c->list, &mrt->mfc6_cache_array[line]);
1449 write_unlock_bh(&mrt_lock);
1452 * Check to see if we resolved a queued list. If so we
1453 * need to send on the frames and tidy up.
1456 spin_lock_bh(&mfc_unres_lock);
1457 list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) {
1458 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1459 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1460 list_del(&uc->list);
1461 atomic_dec(&mrt->cache_resolve_queue_len);
1466 if (list_empty(&mrt->mfc6_unres_queue))
1467 del_timer(&mrt->ipmr_expire_timer);
1468 spin_unlock_bh(&mfc_unres_lock);
1471 ip6mr_cache_resolve(net, mrt, uc, c);
1472 ip6mr_cache_free(uc);
1474 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1479 * Close the multicast socket, and clear the vif tables etc
1482 static void mroute_clean_tables(struct mr6_table *mrt)
1486 struct mfc6_cache *c, *next;
1489 * Shut down all active vif entries
1491 for (i = 0; i < mrt->maxvif; i++) {
1492 if (!(mrt->vif6_table[i].flags & VIFF_STATIC))
1493 mif6_delete(mrt, i, &list);
1495 unregister_netdevice_many(&list);
1500 for (i = 0; i < MFC6_LINES; i++) {
1501 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) {
1502 if (c->mfc_flags & MFC_STATIC)
1504 write_lock_bh(&mrt_lock);
1506 write_unlock_bh(&mrt_lock);
1508 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1509 ip6mr_cache_free(c);
1513 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1514 spin_lock_bh(&mfc_unres_lock);
1515 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
1517 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1518 ip6mr_destroy_unres(mrt, c);
1520 spin_unlock_bh(&mfc_unres_lock);
1524 static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk)
1527 struct net *net = sock_net(sk);
1530 write_lock_bh(&mrt_lock);
1531 if (likely(mrt->mroute6_sk == NULL)) {
1532 mrt->mroute6_sk = sk;
1533 net->ipv6.devconf_all->mc_forwarding++;
1534 inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
1535 NETCONFA_IFINDEX_ALL,
1536 net->ipv6.devconf_all);
1540 write_unlock_bh(&mrt_lock);
1547 int ip6mr_sk_done(struct sock *sk)
1550 struct net *net = sock_net(sk);
1551 struct mr6_table *mrt;
1554 ip6mr_for_each_table(mrt, net) {
1555 if (sk == mrt->mroute6_sk) {
1556 write_lock_bh(&mrt_lock);
1557 mrt->mroute6_sk = NULL;
1558 net->ipv6.devconf_all->mc_forwarding--;
1559 inet6_netconf_notify_devconf(net,
1560 NETCONFA_MC_FORWARDING,
1561 NETCONFA_IFINDEX_ALL,
1562 net->ipv6.devconf_all);
1563 write_unlock_bh(&mrt_lock);
1565 mroute_clean_tables(mrt);
1575 struct sock *mroute6_socket(struct net *net, struct sk_buff *skb)
1577 struct mr6_table *mrt;
1578 struct flowi6 fl6 = {
1579 .flowi6_iif = skb->skb_iif,
1580 .flowi6_oif = skb->dev->ifindex,
1581 .flowi6_mark = skb->mark,
1584 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1587 return mrt->mroute6_sk;
1591 * Socket options and virtual interface manipulation. The whole
1592 * virtual interface system is a complete heap, but unfortunately
1593 * that's how BSD mrouted happens to think. Maybe one day with a proper
1594 * MOSPF/PIM router set up we can clean this up.
1597 int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1603 struct net *net = sock_net(sk);
1604 struct mr6_table *mrt;
1606 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1610 if (optname != MRT6_INIT) {
1611 if (sk != mrt->mroute6_sk && !ns_capable(net->user_ns, CAP_NET_ADMIN))
1617 if (sk->sk_type != SOCK_RAW ||
1618 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1620 if (optlen < sizeof(int))
1623 return ip6mr_sk_init(mrt, sk);
1626 return ip6mr_sk_done(sk);
1629 if (optlen < sizeof(vif))
1631 if (copy_from_user(&vif, optval, sizeof(vif)))
1633 if (vif.mif6c_mifi >= MAXMIFS)
1636 ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk);
1641 if (optlen < sizeof(mifi_t))
1643 if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
1646 ret = mif6_delete(mrt, mifi, NULL);
1651 * Manipulate the forwarding caches. These live
1652 * in a sort of kernel/user symbiosis.
1656 if (optlen < sizeof(mfc))
1658 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1661 if (optname == MRT6_DEL_MFC)
1662 ret = ip6mr_mfc_delete(mrt, &mfc);
1664 ret = ip6mr_mfc_add(net, mrt, &mfc, sk == mrt->mroute6_sk);
1669 * Control PIM assert (to activate pim will activate assert)
1675 if (optlen != sizeof(v))
1677 if (get_user(v, (int __user *)optval))
1679 mrt->mroute_do_assert = v;
1683 #ifdef CONFIG_IPV6_PIMSM_V2
1688 if (optlen != sizeof(v))
1690 if (get_user(v, (int __user *)optval))
1695 if (v != mrt->mroute_do_pim) {
1696 mrt->mroute_do_pim = v;
1697 mrt->mroute_do_assert = v;
1704 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1709 if (optlen != sizeof(u32))
1711 if (get_user(v, (u32 __user *)optval))
1713 if (sk == mrt->mroute6_sk)
1718 if (!ip6mr_new_table(net, v))
1720 raw6_sk(sk)->ip6mr_table = v;
1726 * Spurious command, or MRT6_VERSION which you cannot
1730 return -ENOPROTOOPT;
1735 * Getsock opt support for the multicast routing system.
1738 int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1743 struct net *net = sock_net(sk);
1744 struct mr6_table *mrt;
1746 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1754 #ifdef CONFIG_IPV6_PIMSM_V2
1756 val = mrt->mroute_do_pim;
1760 val = mrt->mroute_do_assert;
1763 return -ENOPROTOOPT;
1766 if (get_user(olr, optlen))
1769 olr = min_t(int, olr, sizeof(int));
1773 if (put_user(olr, optlen))
1775 if (copy_to_user(optval, &val, olr))
1781 * The IP multicast ioctl support routines.
1784 int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1786 struct sioc_sg_req6 sr;
1787 struct sioc_mif_req6 vr;
1788 struct mif_device *vif;
1789 struct mfc6_cache *c;
1790 struct net *net = sock_net(sk);
1791 struct mr6_table *mrt;
1793 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1798 case SIOCGETMIFCNT_IN6:
1799 if (copy_from_user(&vr, arg, sizeof(vr)))
1801 if (vr.mifi >= mrt->maxvif)
1803 read_lock(&mrt_lock);
1804 vif = &mrt->vif6_table[vr.mifi];
1805 if (MIF_EXISTS(mrt, vr.mifi)) {
1806 vr.icount = vif->pkt_in;
1807 vr.ocount = vif->pkt_out;
1808 vr.ibytes = vif->bytes_in;
1809 vr.obytes = vif->bytes_out;
1810 read_unlock(&mrt_lock);
1812 if (copy_to_user(arg, &vr, sizeof(vr)))
1816 read_unlock(&mrt_lock);
1817 return -EADDRNOTAVAIL;
1818 case SIOCGETSGCNT_IN6:
1819 if (copy_from_user(&sr, arg, sizeof(sr)))
1822 read_lock(&mrt_lock);
1823 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1825 sr.pktcnt = c->mfc_un.res.pkt;
1826 sr.bytecnt = c->mfc_un.res.bytes;
1827 sr.wrong_if = c->mfc_un.res.wrong_if;
1828 read_unlock(&mrt_lock);
1830 if (copy_to_user(arg, &sr, sizeof(sr)))
1834 read_unlock(&mrt_lock);
1835 return -EADDRNOTAVAIL;
1837 return -ENOIOCTLCMD;
1841 #ifdef CONFIG_COMPAT
1842 struct compat_sioc_sg_req6 {
1843 struct sockaddr_in6 src;
1844 struct sockaddr_in6 grp;
1845 compat_ulong_t pktcnt;
1846 compat_ulong_t bytecnt;
1847 compat_ulong_t wrong_if;
1850 struct compat_sioc_mif_req6 {
1852 compat_ulong_t icount;
1853 compat_ulong_t ocount;
1854 compat_ulong_t ibytes;
1855 compat_ulong_t obytes;
1858 int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1860 struct compat_sioc_sg_req6 sr;
1861 struct compat_sioc_mif_req6 vr;
1862 struct mif_device *vif;
1863 struct mfc6_cache *c;
1864 struct net *net = sock_net(sk);
1865 struct mr6_table *mrt;
1867 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1872 case SIOCGETMIFCNT_IN6:
1873 if (copy_from_user(&vr, arg, sizeof(vr)))
1875 if (vr.mifi >= mrt->maxvif)
1877 read_lock(&mrt_lock);
1878 vif = &mrt->vif6_table[vr.mifi];
1879 if (MIF_EXISTS(mrt, vr.mifi)) {
1880 vr.icount = vif->pkt_in;
1881 vr.ocount = vif->pkt_out;
1882 vr.ibytes = vif->bytes_in;
1883 vr.obytes = vif->bytes_out;
1884 read_unlock(&mrt_lock);
1886 if (copy_to_user(arg, &vr, sizeof(vr)))
1890 read_unlock(&mrt_lock);
1891 return -EADDRNOTAVAIL;
1892 case SIOCGETSGCNT_IN6:
1893 if (copy_from_user(&sr, arg, sizeof(sr)))
1896 read_lock(&mrt_lock);
1897 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1899 sr.pktcnt = c->mfc_un.res.pkt;
1900 sr.bytecnt = c->mfc_un.res.bytes;
1901 sr.wrong_if = c->mfc_un.res.wrong_if;
1902 read_unlock(&mrt_lock);
1904 if (copy_to_user(arg, &sr, sizeof(sr)))
1908 read_unlock(&mrt_lock);
1909 return -EADDRNOTAVAIL;
1911 return -ENOIOCTLCMD;
1916 static inline int ip6mr_forward2_finish(struct sk_buff *skb)
1918 IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
1919 IPSTATS_MIB_OUTFORWDATAGRAMS);
1920 IP6_ADD_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
1921 IPSTATS_MIB_OUTOCTETS, skb->len);
1922 return dst_output(skb);
1926 * Processing handlers for ip6mr_forward
1929 static int ip6mr_forward2(struct net *net, struct mr6_table *mrt,
1930 struct sk_buff *skb, struct mfc6_cache *c, int vifi)
1932 struct ipv6hdr *ipv6h;
1933 struct mif_device *vif = &mrt->vif6_table[vifi];
1934 struct net_device *dev;
1935 struct dst_entry *dst;
1938 if (vif->dev == NULL)
1941 #ifdef CONFIG_IPV6_PIMSM_V2
1942 if (vif->flags & MIFF_REGISTER) {
1944 vif->bytes_out += skb->len;
1945 vif->dev->stats.tx_bytes += skb->len;
1946 vif->dev->stats.tx_packets++;
1947 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
1952 ipv6h = ipv6_hdr(skb);
1954 fl6 = (struct flowi6) {
1955 .flowi6_oif = vif->link,
1956 .daddr = ipv6h->daddr,
1959 dst = ip6_route_output(net, NULL, &fl6);
1966 skb_dst_set(skb, dst);
1969 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1970 * not only before forwarding, but after forwarding on all output
1971 * interfaces. It is clear, if mrouter runs a multicasting
1972 * program, it should receive packets not depending to what interface
1973 * program is joined.
1974 * If we will not make it, the program will have to join on all
1975 * interfaces. On the other hand, multihoming host (or router, but
1976 * not mrouter) cannot join to more than one interface - it will
1977 * result in receiving multiple packets.
1982 vif->bytes_out += skb->len;
1984 /* We are about to write */
1985 /* XXX: extension headers? */
1986 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
1989 ipv6h = ipv6_hdr(skb);
1992 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
1994 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dev,
1995 ip6mr_forward2_finish);
2002 static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev)
2006 for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
2007 if (mrt->vif6_table[ct].dev == dev)
2013 static int ip6_mr_forward(struct net *net, struct mr6_table *mrt,
2014 struct sk_buff *skb, struct mfc6_cache *cache)
2019 vif = cache->mf6c_parent;
2020 cache->mfc_un.res.pkt++;
2021 cache->mfc_un.res.bytes += skb->len;
2024 * Wrong interface: drop packet and (maybe) send PIM assert.
2026 if (mrt->vif6_table[vif].dev != skb->dev) {
2029 cache->mfc_un.res.wrong_if++;
2030 true_vifi = ip6mr_find_vif(mrt, skb->dev);
2032 if (true_vifi >= 0 && mrt->mroute_do_assert &&
2033 /* pimsm uses asserts, when switching from RPT to SPT,
2034 so that we cannot check that packet arrived on an oif.
2035 It is bad, but otherwise we would need to move pretty
2036 large chunk of pimd to kernel. Ough... --ANK
2038 (mrt->mroute_do_pim ||
2039 cache->mfc_un.res.ttls[true_vifi] < 255) &&
2041 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
2042 cache->mfc_un.res.last_assert = jiffies;
2043 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2048 mrt->vif6_table[vif].pkt_in++;
2049 mrt->vif6_table[vif].bytes_in += skb->len;
2054 for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
2055 if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
2057 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2059 ip6mr_forward2(net, mrt, skb2, cache, psend);
2065 ip6mr_forward2(net, mrt, skb, cache, psend);
2076 * Multicast packets for forwarding arrive here
2079 int ip6_mr_input(struct sk_buff *skb)
2081 struct mfc6_cache *cache;
2082 struct net *net = dev_net(skb->dev);
2083 struct mr6_table *mrt;
2084 struct flowi6 fl6 = {
2085 .flowi6_iif = skb->dev->ifindex,
2086 .flowi6_mark = skb->mark,
2090 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2096 read_lock(&mrt_lock);
2097 cache = ip6mr_cache_find(mrt,
2098 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2101 * No usable cache entry
2103 if (cache == NULL) {
2106 vif = ip6mr_find_vif(mrt, skb->dev);
2108 int err = ip6mr_cache_unresolved(mrt, vif, skb);
2109 read_unlock(&mrt_lock);
2113 read_unlock(&mrt_lock);
2118 ip6_mr_forward(net, mrt, skb, cache);
2120 read_unlock(&mrt_lock);
2126 static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2127 struct mfc6_cache *c, struct rtmsg *rtm)
2130 struct rtnexthop *nhp;
2131 struct nlattr *mp_attr;
2132 struct rta_mfc_stats mfcs;
2134 /* If cache is unresolved, don't try to parse IIF and OIF */
2135 if (c->mf6c_parent >= MAXMIFS)
2138 if (MIF_EXISTS(mrt, c->mf6c_parent) &&
2139 nla_put_u32(skb, RTA_IIF, mrt->vif6_table[c->mf6c_parent].dev->ifindex) < 0)
2141 mp_attr = nla_nest_start(skb, RTA_MULTIPATH);
2142 if (mp_attr == NULL)
2145 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2146 if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2147 nhp = nla_reserve_nohdr(skb, sizeof(*nhp));
2149 nla_nest_cancel(skb, mp_attr);
2153 nhp->rtnh_flags = 0;
2154 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2155 nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex;
2156 nhp->rtnh_len = sizeof(*nhp);
2160 nla_nest_end(skb, mp_attr);
2162 mfcs.mfcs_packets = c->mfc_un.res.pkt;
2163 mfcs.mfcs_bytes = c->mfc_un.res.bytes;
2164 mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
2165 if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0)
2168 rtm->rtm_type = RTN_MULTICAST;
2172 int ip6mr_get_route(struct net *net,
2173 struct sk_buff *skb, struct rtmsg *rtm, int nowait)
2176 struct mr6_table *mrt;
2177 struct mfc6_cache *cache;
2178 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
2180 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2184 read_lock(&mrt_lock);
2185 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2188 struct sk_buff *skb2;
2189 struct ipv6hdr *iph;
2190 struct net_device *dev;
2194 read_unlock(&mrt_lock);
2199 if (dev == NULL || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2200 read_unlock(&mrt_lock);
2204 /* really correct? */
2205 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2207 read_unlock(&mrt_lock);
2211 skb_reset_transport_header(skb2);
2213 skb_put(skb2, sizeof(struct ipv6hdr));
2214 skb_reset_network_header(skb2);
2216 iph = ipv6_hdr(skb2);
2219 iph->flow_lbl[0] = 0;
2220 iph->flow_lbl[1] = 0;
2221 iph->flow_lbl[2] = 0;
2222 iph->payload_len = 0;
2223 iph->nexthdr = IPPROTO_NONE;
2225 iph->saddr = rt->rt6i_src.addr;
2226 iph->daddr = rt->rt6i_dst.addr;
2228 err = ip6mr_cache_unresolved(mrt, vif, skb2);
2229 read_unlock(&mrt_lock);
2234 if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
2235 cache->mfc_flags |= MFC_NOTIFY;
2237 err = __ip6mr_fill_mroute(mrt, skb, cache, rtm);
2238 read_unlock(&mrt_lock);
2242 static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
2243 u32 portid, u32 seq, struct mfc6_cache *c, int cmd)
2245 struct nlmsghdr *nlh;
2249 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), NLM_F_MULTI);
2253 rtm = nlmsg_data(nlh);
2254 rtm->rtm_family = RTNL_FAMILY_IP6MR;
2255 rtm->rtm_dst_len = 128;
2256 rtm->rtm_src_len = 128;
2258 rtm->rtm_table = mrt->id;
2259 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2260 goto nla_put_failure;
2261 rtm->rtm_type = RTN_MULTICAST;
2262 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2263 if (c->mfc_flags & MFC_STATIC)
2264 rtm->rtm_protocol = RTPROT_STATIC;
2266 rtm->rtm_protocol = RTPROT_MROUTED;
2269 if (nla_put(skb, RTA_SRC, 16, &c->mf6c_origin) ||
2270 nla_put(skb, RTA_DST, 16, &c->mf6c_mcastgrp))
2271 goto nla_put_failure;
2272 err = __ip6mr_fill_mroute(mrt, skb, c, rtm);
2273 /* do not break the dump if cache is unresolved */
2274 if (err < 0 && err != -ENOENT)
2275 goto nla_put_failure;
2277 return nlmsg_end(skb, nlh);
2280 nlmsg_cancel(skb, nlh);
2284 static int mr6_msgsize(bool unresolved, int maxvif)
2287 NLMSG_ALIGN(sizeof(struct rtmsg))
2288 + nla_total_size(4) /* RTA_TABLE */
2289 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
2290 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
2295 + nla_total_size(4) /* RTA_IIF */
2296 + nla_total_size(0) /* RTA_MULTIPATH */
2297 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2299 + nla_total_size(sizeof(struct rta_mfc_stats))
2305 static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
2308 struct net *net = read_pnet(&mrt->net);
2309 struct sk_buff *skb;
2312 skb = nlmsg_new(mr6_msgsize(mfc->mf6c_parent >= MAXMIFS, mrt->maxvif),
2317 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd);
2321 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
2327 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
2330 static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2332 struct net *net = sock_net(skb->sk);
2333 struct mr6_table *mrt;
2334 struct mfc6_cache *mfc;
2335 unsigned int t = 0, s_t;
2336 unsigned int h = 0, s_h;
2337 unsigned int e = 0, s_e;
2343 read_lock(&mrt_lock);
2344 ip6mr_for_each_table(mrt, net) {
2349 for (h = s_h; h < MFC6_LINES; h++) {
2350 list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) {
2353 if (ip6mr_fill_mroute(mrt, skb,
2354 NETLINK_CB(cb->skb).portid,
2356 mfc, RTM_NEWROUTE) < 0)
2363 spin_lock_bh(&mfc_unres_lock);
2364 list_for_each_entry(mfc, &mrt->mfc6_unres_queue, list) {
2367 if (ip6mr_fill_mroute(mrt, skb,
2368 NETLINK_CB(cb->skb).portid,
2370 mfc, RTM_NEWROUTE) < 0) {
2371 spin_unlock_bh(&mfc_unres_lock);
2377 spin_unlock_bh(&mfc_unres_lock);
2384 read_unlock(&mrt_lock);