2 * IP multicast routing support for mrouted 3.6/3.8
4 * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk>
5 * Linux Consultancy and Custom Driver Development
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
13 * Michael Chastain : Incorrect size of copying.
14 * Alan Cox : Added the cache manager code
15 * Alan Cox : Fixed the clone/copy bug and device race.
16 * Mike McLagan : Routing by source
17 * Malcolm Beattie : Buffer handling fixes.
18 * Alexey Kuznetsov : Double buffer free and other fixes.
19 * SVR Anand : Fixed several multicast bugs and problems.
20 * Alexey Kuznetsov : Status, optimisations and more.
21 * Brad Parker : Better behaviour on mrouted upcall
23 * Carlos Picoto : PIMv1 Support
24 * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header
25 * Relax this requirement to work with older peers.
29 #include <asm/uaccess.h>
30 #include <linux/types.h>
31 #include <linux/capability.h>
32 #include <linux/errno.h>
33 #include <linux/timer.h>
35 #include <linux/kernel.h>
36 #include <linux/fcntl.h>
37 #include <linux/stat.h>
38 #include <linux/socket.h>
40 #include <linux/inet.h>
41 #include <linux/netdevice.h>
42 #include <linux/inetdevice.h>
43 #include <linux/igmp.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <linux/mroute.h>
47 #include <linux/init.h>
48 #include <linux/if_ether.h>
49 #include <linux/slab.h>
50 #include <net/net_namespace.h>
52 #include <net/protocol.h>
53 #include <linux/skbuff.h>
54 #include <net/route.h>
59 #include <linux/notifier.h>
60 #include <linux/if_arp.h>
61 #include <linux/netfilter_ipv4.h>
62 #include <linux/compat.h>
63 #include <linux/export.h>
64 #include <net/ip_tunnels.h>
65 #include <net/checksum.h>
66 #include <net/netlink.h>
67 #include <net/fib_rules.h>
68 #include <linux/netconf.h>
70 #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
71 #define CONFIG_IP_PIMSM 1
75 struct list_head list;
80 struct sock __rcu *mroute_sk;
81 struct timer_list ipmr_expire_timer;
82 struct list_head mfc_unres_queue;
83 struct list_head mfc_cache_array[MFC_LINES];
84 struct vif_device vif_table[MAXVIFS];
86 atomic_t cache_resolve_queue_len;
87 bool mroute_do_assert;
89 #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
90 int mroute_reg_vif_num;
95 struct fib_rule common;
102 /* Big lock, protecting vif table, mrt cache and mroute socket state.
103 * Note that the changes are semaphored via rtnl_lock.
106 static DEFINE_RWLOCK(mrt_lock);
109 * Multicast router control variables
112 #define VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_table[_idx].dev != NULL)
114 /* Special spinlock for queue of unresolved entries */
115 static DEFINE_SPINLOCK(mfc_unres_lock);
117 /* We return to original Alan's scheme. Hash table of resolved
118 * entries is changed only in process context and protected
119 * with weak lock mrt_lock. Queue of unresolved entries is protected
120 * with strong spinlock mfc_unres_lock.
122 * In this case data path is free of exclusive locks at all.
125 static struct kmem_cache *mrt_cachep __read_mostly;
127 static struct mr_table *ipmr_new_table(struct net *net, u32 id);
128 static void ipmr_free_table(struct mr_table *mrt);
130 static int ip_mr_forward(struct net *net, struct mr_table *mrt,
131 struct sk_buff *skb, struct mfc_cache *cache,
133 static int ipmr_cache_report(struct mr_table *mrt,
134 struct sk_buff *pkt, vifi_t vifi, int assert);
135 static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
136 struct mfc_cache *c, struct rtmsg *rtm);
137 static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
139 static void mroute_clean_tables(struct mr_table *mrt);
140 static void ipmr_expire_process(unsigned long arg);
142 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
143 #define ipmr_for_each_table(mrt, net) \
144 list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list)
146 static struct mr_table *ipmr_get_table(struct net *net, u32 id)
148 struct mr_table *mrt;
150 ipmr_for_each_table(mrt, net) {
157 static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
158 struct mr_table **mrt)
161 struct ipmr_result res;
162 struct fib_lookup_arg arg = {
164 .flags = FIB_LOOKUP_NOREF,
167 err = fib_rules_lookup(net->ipv4.mr_rules_ops,
168 flowi4_to_flowi(flp4), 0, &arg);
175 static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp,
176 int flags, struct fib_lookup_arg *arg)
178 struct ipmr_result *res = arg->result;
179 struct mr_table *mrt;
181 switch (rule->action) {
184 case FR_ACT_UNREACHABLE:
186 case FR_ACT_PROHIBIT:
188 case FR_ACT_BLACKHOLE:
193 mrt = ipmr_get_table(rule->fr_net, rule->table);
200 static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
205 static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = {
209 static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
210 struct fib_rule_hdr *frh, struct nlattr **tb)
215 static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
221 static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
222 struct fib_rule_hdr *frh)
230 static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = {
231 .family = RTNL_FAMILY_IPMR,
232 .rule_size = sizeof(struct ipmr_rule),
233 .addr_size = sizeof(u32),
234 .action = ipmr_rule_action,
235 .match = ipmr_rule_match,
236 .configure = ipmr_rule_configure,
237 .compare = ipmr_rule_compare,
238 .default_pref = fib_default_rule_pref,
239 .fill = ipmr_rule_fill,
240 .nlgroup = RTNLGRP_IPV4_RULE,
241 .policy = ipmr_rule_policy,
242 .owner = THIS_MODULE,
245 static int __net_init ipmr_rules_init(struct net *net)
247 struct fib_rules_ops *ops;
248 struct mr_table *mrt;
251 ops = fib_rules_register(&ipmr_rules_ops_template, net);
255 INIT_LIST_HEAD(&net->ipv4.mr_tables);
257 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
263 err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0);
267 net->ipv4.mr_rules_ops = ops;
273 fib_rules_unregister(ops);
277 static void __net_exit ipmr_rules_exit(struct net *net)
279 struct mr_table *mrt, *next;
281 list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
282 list_del(&mrt->list);
283 ipmr_free_table(mrt);
285 fib_rules_unregister(net->ipv4.mr_rules_ops);
288 #define ipmr_for_each_table(mrt, net) \
289 for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
291 static struct mr_table *ipmr_get_table(struct net *net, u32 id)
293 return net->ipv4.mrt;
296 static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
297 struct mr_table **mrt)
299 *mrt = net->ipv4.mrt;
303 static int __net_init ipmr_rules_init(struct net *net)
305 net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
306 return net->ipv4.mrt ? 0 : -ENOMEM;
309 static void __net_exit ipmr_rules_exit(struct net *net)
311 ipmr_free_table(net->ipv4.mrt);
315 static struct mr_table *ipmr_new_table(struct net *net, u32 id)
317 struct mr_table *mrt;
320 mrt = ipmr_get_table(net, id);
324 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
327 write_pnet(&mrt->net, net);
330 /* Forwarding cache */
331 for (i = 0; i < MFC_LINES; i++)
332 INIT_LIST_HEAD(&mrt->mfc_cache_array[i]);
334 INIT_LIST_HEAD(&mrt->mfc_unres_queue);
336 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
339 #ifdef CONFIG_IP_PIMSM
340 mrt->mroute_reg_vif_num = -1;
342 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
343 list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
348 static void ipmr_free_table(struct mr_table *mrt)
350 del_timer_sync(&mrt->ipmr_expire_timer);
351 mroute_clean_tables(mrt);
355 /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
357 static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v)
359 struct net *net = dev_net(dev);
363 dev = __dev_get_by_name(net, "tunl0");
365 const struct net_device_ops *ops = dev->netdev_ops;
367 struct ip_tunnel_parm p;
369 memset(&p, 0, sizeof(p));
370 p.iph.daddr = v->vifc_rmt_addr.s_addr;
371 p.iph.saddr = v->vifc_lcl_addr.s_addr;
374 p.iph.protocol = IPPROTO_IPIP;
375 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
376 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
378 if (ops->ndo_do_ioctl) {
379 mm_segment_t oldfs = get_fs();
382 ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL);
389 struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
391 struct net_device *dev;
393 dev = __dev_get_by_name(net, "tunl0");
396 const struct net_device_ops *ops = dev->netdev_ops;
399 struct ip_tunnel_parm p;
400 struct in_device *in_dev;
402 memset(&p, 0, sizeof(p));
403 p.iph.daddr = v->vifc_rmt_addr.s_addr;
404 p.iph.saddr = v->vifc_lcl_addr.s_addr;
407 p.iph.protocol = IPPROTO_IPIP;
408 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
409 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
411 if (ops->ndo_do_ioctl) {
412 mm_segment_t oldfs = get_fs();
415 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
423 (dev = __dev_get_by_name(net, p.name)) != NULL) {
424 dev->flags |= IFF_MULTICAST;
426 in_dev = __in_dev_get_rtnl(dev);
430 ipv4_devconf_setall(in_dev);
431 IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
441 /* allow the register to be completed before unregistering. */
445 unregister_netdevice(dev);
449 #ifdef CONFIG_IP_PIMSM
451 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
453 struct net *net = dev_net(dev);
454 struct mr_table *mrt;
455 struct flowi4 fl4 = {
456 .flowi4_oif = dev->ifindex,
457 .flowi4_iif = skb->skb_iif,
458 .flowi4_mark = skb->mark,
462 err = ipmr_fib_lookup(net, &fl4, &mrt);
468 read_lock(&mrt_lock);
469 dev->stats.tx_bytes += skb->len;
470 dev->stats.tx_packets++;
471 ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT);
472 read_unlock(&mrt_lock);
477 static const struct net_device_ops reg_vif_netdev_ops = {
478 .ndo_start_xmit = reg_vif_xmit,
481 static void reg_vif_setup(struct net_device *dev)
483 dev->type = ARPHRD_PIMREG;
484 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
485 dev->flags = IFF_NOARP;
486 dev->netdev_ops = ®_vif_netdev_ops,
487 dev->destructor = free_netdev;
488 dev->features |= NETIF_F_NETNS_LOCAL;
491 static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
493 struct net_device *dev;
494 struct in_device *in_dev;
497 if (mrt->id == RT_TABLE_DEFAULT)
498 sprintf(name, "pimreg");
500 sprintf(name, "pimreg%u", mrt->id);
502 dev = alloc_netdev(0, name, reg_vif_setup);
507 dev_net_set(dev, net);
509 if (register_netdevice(dev)) {
516 in_dev = __in_dev_get_rcu(dev);
522 ipv4_devconf_setall(in_dev);
523 IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
534 /* allow the register to be completed before unregistering. */
538 unregister_netdevice(dev);
544 * vif_delete - Delete a VIF entry
545 * @notify: Set to 1, if the caller is a notifier_call
548 static int vif_delete(struct mr_table *mrt, int vifi, int notify,
549 struct list_head *head)
551 struct vif_device *v;
552 struct net_device *dev;
553 struct in_device *in_dev;
555 if (vifi < 0 || vifi >= mrt->maxvif)
556 return -EADDRNOTAVAIL;
558 v = &mrt->vif_table[vifi];
560 write_lock_bh(&mrt_lock);
565 write_unlock_bh(&mrt_lock);
566 return -EADDRNOTAVAIL;
569 #ifdef CONFIG_IP_PIMSM
570 if (vifi == mrt->mroute_reg_vif_num)
571 mrt->mroute_reg_vif_num = -1;
574 if (vifi + 1 == mrt->maxvif) {
577 for (tmp = vifi - 1; tmp >= 0; tmp--) {
578 if (VIF_EXISTS(mrt, tmp))
584 write_unlock_bh(&mrt_lock);
586 dev_set_allmulti(dev, -1);
588 in_dev = __in_dev_get_rtnl(dev);
590 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
591 inet_netconf_notify_devconf(dev_net(dev),
592 NETCONFA_MC_FORWARDING,
593 dev->ifindex, &in_dev->cnf);
594 ip_rt_multicast_event(in_dev);
597 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
598 unregister_netdevice_queue(dev, head);
604 static void ipmr_cache_free_rcu(struct rcu_head *head)
606 struct mfc_cache *c = container_of(head, struct mfc_cache, rcu);
608 kmem_cache_free(mrt_cachep, c);
611 static inline void ipmr_cache_free(struct mfc_cache *c)
613 call_rcu(&c->rcu, ipmr_cache_free_rcu);
616 /* Destroy an unresolved cache entry, killing queued skbs
617 * and reporting error to netlink readers.
620 static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
622 struct net *net = read_pnet(&mrt->net);
626 atomic_dec(&mrt->cache_resolve_queue_len);
628 while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) {
629 if (ip_hdr(skb)->version == 0) {
630 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
631 nlh->nlmsg_type = NLMSG_ERROR;
632 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
633 skb_trim(skb, nlh->nlmsg_len);
635 e->error = -ETIMEDOUT;
636 memset(&e->msg, 0, sizeof(e->msg));
638 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
648 /* Timer process for the unresolved queue. */
650 static void ipmr_expire_process(unsigned long arg)
652 struct mr_table *mrt = (struct mr_table *)arg;
654 unsigned long expires;
655 struct mfc_cache *c, *next;
657 if (!spin_trylock(&mfc_unres_lock)) {
658 mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
662 if (list_empty(&mrt->mfc_unres_queue))
668 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
669 if (time_after(c->mfc_un.unres.expires, now)) {
670 unsigned long interval = c->mfc_un.unres.expires - now;
671 if (interval < expires)
677 mroute_netlink_event(mrt, c, RTM_DELROUTE);
678 ipmr_destroy_unres(mrt, c);
681 if (!list_empty(&mrt->mfc_unres_queue))
682 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
685 spin_unlock(&mfc_unres_lock);
688 /* Fill oifs list. It is called under write locked mrt_lock. */
690 static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache,
695 cache->mfc_un.res.minvif = MAXVIFS;
696 cache->mfc_un.res.maxvif = 0;
697 memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
699 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
700 if (VIF_EXISTS(mrt, vifi) &&
701 ttls[vifi] && ttls[vifi] < 255) {
702 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
703 if (cache->mfc_un.res.minvif > vifi)
704 cache->mfc_un.res.minvif = vifi;
705 if (cache->mfc_un.res.maxvif <= vifi)
706 cache->mfc_un.res.maxvif = vifi + 1;
711 static int vif_add(struct net *net, struct mr_table *mrt,
712 struct vifctl *vifc, int mrtsock)
714 int vifi = vifc->vifc_vifi;
715 struct vif_device *v = &mrt->vif_table[vifi];
716 struct net_device *dev;
717 struct in_device *in_dev;
721 if (VIF_EXISTS(mrt, vifi))
724 switch (vifc->vifc_flags) {
725 #ifdef CONFIG_IP_PIMSM
728 * Special Purpose VIF in PIM
729 * All the packets will be sent to the daemon
731 if (mrt->mroute_reg_vif_num >= 0)
733 dev = ipmr_reg_vif(net, mrt);
736 err = dev_set_allmulti(dev, 1);
738 unregister_netdevice(dev);
745 dev = ipmr_new_tunnel(net, vifc);
748 err = dev_set_allmulti(dev, 1);
750 ipmr_del_tunnel(dev, vifc);
756 case VIFF_USE_IFINDEX:
758 if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
759 dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
760 if (dev && __in_dev_get_rtnl(dev) == NULL) {
762 return -EADDRNOTAVAIL;
765 dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
768 return -EADDRNOTAVAIL;
769 err = dev_set_allmulti(dev, 1);
779 in_dev = __in_dev_get_rtnl(dev);
782 return -EADDRNOTAVAIL;
784 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
785 inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, dev->ifindex,
787 ip_rt_multicast_event(in_dev);
789 /* Fill in the VIF structures */
791 v->rate_limit = vifc->vifc_rate_limit;
792 v->local = vifc->vifc_lcl_addr.s_addr;
793 v->remote = vifc->vifc_rmt_addr.s_addr;
794 v->flags = vifc->vifc_flags;
796 v->flags |= VIFF_STATIC;
797 v->threshold = vifc->vifc_threshold;
802 v->link = dev->ifindex;
803 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER))
804 v->link = dev->iflink;
806 /* And finish update writing critical data */
807 write_lock_bh(&mrt_lock);
809 #ifdef CONFIG_IP_PIMSM
810 if (v->flags & VIFF_REGISTER)
811 mrt->mroute_reg_vif_num = vifi;
813 if (vifi+1 > mrt->maxvif)
814 mrt->maxvif = vifi+1;
815 write_unlock_bh(&mrt_lock);
819 /* called with rcu_read_lock() */
820 static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
824 int line = MFC_HASH(mcastgrp, origin);
827 list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) {
828 if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp)
834 /* Look for a (*,*,oif) entry */
835 static struct mfc_cache *ipmr_cache_find_any_parent(struct mr_table *mrt,
838 int line = MFC_HASH(htonl(INADDR_ANY), htonl(INADDR_ANY));
841 list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list)
842 if (c->mfc_origin == htonl(INADDR_ANY) &&
843 c->mfc_mcastgrp == htonl(INADDR_ANY) &&
844 c->mfc_un.res.ttls[vifi] < 255)
850 /* Look for a (*,G) entry */
851 static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt,
852 __be32 mcastgrp, int vifi)
854 int line = MFC_HASH(mcastgrp, htonl(INADDR_ANY));
855 struct mfc_cache *c, *proxy;
857 if (mcastgrp == htonl(INADDR_ANY))
860 list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list)
861 if (c->mfc_origin == htonl(INADDR_ANY) &&
862 c->mfc_mcastgrp == mcastgrp) {
863 if (c->mfc_un.res.ttls[vifi] < 255)
866 /* It's ok if the vifi is part of the static tree */
867 proxy = ipmr_cache_find_any_parent(mrt,
869 if (proxy && proxy->mfc_un.res.ttls[vifi] < 255)
874 return ipmr_cache_find_any_parent(mrt, vifi);
878 * Allocate a multicast cache entry
880 static struct mfc_cache *ipmr_cache_alloc(void)
882 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
885 c->mfc_un.res.minvif = MAXVIFS;
889 static struct mfc_cache *ipmr_cache_alloc_unres(void)
891 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
894 skb_queue_head_init(&c->mfc_un.unres.unresolved);
895 c->mfc_un.unres.expires = jiffies + 10*HZ;
901 * A cache entry has gone into a resolved state from queued
904 static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
905 struct mfc_cache *uc, struct mfc_cache *c)
910 /* Play the pending entries through our router */
912 while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
913 if (ip_hdr(skb)->version == 0) {
914 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
916 if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
917 nlh->nlmsg_len = skb_tail_pointer(skb) -
920 nlh->nlmsg_type = NLMSG_ERROR;
921 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
922 skb_trim(skb, nlh->nlmsg_len);
924 e->error = -EMSGSIZE;
925 memset(&e->msg, 0, sizeof(e->msg));
928 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
930 ip_mr_forward(net, mrt, skb, c, 0);
936 * Bounce a cache query up to mrouted. We could use netlink for this but mrouted
937 * expects the following bizarre scheme.
939 * Called under mrt_lock.
942 static int ipmr_cache_report(struct mr_table *mrt,
943 struct sk_buff *pkt, vifi_t vifi, int assert)
946 const int ihl = ip_hdrlen(pkt);
947 struct igmphdr *igmp;
949 struct sock *mroute_sk;
952 #ifdef CONFIG_IP_PIMSM
953 if (assert == IGMPMSG_WHOLEPKT)
954 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
957 skb = alloc_skb(128, GFP_ATOMIC);
962 #ifdef CONFIG_IP_PIMSM
963 if (assert == IGMPMSG_WHOLEPKT) {
964 /* Ugly, but we have no choice with this interface.
965 * Duplicate old header, fix ihl, length etc.
966 * And all this only to mangle msg->im_msgtype and
967 * to set msg->im_mbz to "mbz" :-)
969 skb_push(skb, sizeof(struct iphdr));
970 skb_reset_network_header(skb);
971 skb_reset_transport_header(skb);
972 msg = (struct igmpmsg *)skb_network_header(skb);
973 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
974 msg->im_msgtype = IGMPMSG_WHOLEPKT;
976 msg->im_vif = mrt->mroute_reg_vif_num;
977 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
978 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
979 sizeof(struct iphdr));
984 /* Copy the IP header */
986 skb->network_header = skb->tail;
988 skb_copy_to_linear_data(skb, pkt->data, ihl);
989 ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */
990 msg = (struct igmpmsg *)skb_network_header(skb);
992 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
996 igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
998 msg->im_msgtype = assert;
1000 ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
1001 skb->transport_header = skb->network_header;
1005 mroute_sk = rcu_dereference(mrt->mroute_sk);
1006 if (mroute_sk == NULL) {
1012 /* Deliver to mrouted */
1014 ret = sock_queue_rcv_skb(mroute_sk, skb);
1017 net_warn_ratelimited("mroute: pending queue full, dropping entries\n");
1025 * Queue a packet for resolution. It gets locked cache entry!
1029 ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb)
1033 struct mfc_cache *c;
1034 const struct iphdr *iph = ip_hdr(skb);
1036 spin_lock_bh(&mfc_unres_lock);
1037 list_for_each_entry(c, &mrt->mfc_unres_queue, list) {
1038 if (c->mfc_mcastgrp == iph->daddr &&
1039 c->mfc_origin == iph->saddr) {
1046 /* Create a new entry if allowable */
1048 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1049 (c = ipmr_cache_alloc_unres()) == NULL) {
1050 spin_unlock_bh(&mfc_unres_lock);
1056 /* Fill in the new cache entry */
1059 c->mfc_origin = iph->saddr;
1060 c->mfc_mcastgrp = iph->daddr;
1062 /* Reflect first query at mrouted. */
1064 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
1066 /* If the report failed throw the cache entry
1069 spin_unlock_bh(&mfc_unres_lock);
1076 atomic_inc(&mrt->cache_resolve_queue_len);
1077 list_add(&c->list, &mrt->mfc_unres_queue);
1078 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1080 if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
1081 mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires);
1084 /* See if we can append the packet */
1086 if (c->mfc_un.unres.unresolved.qlen > 3) {
1090 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1094 spin_unlock_bh(&mfc_unres_lock);
1099 * MFC cache manipulation by user space mroute daemon
1102 static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
1105 struct mfc_cache *c, *next;
1107 line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
1109 list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) {
1110 if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
1111 c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr &&
1112 (parent == -1 || parent == c->mfc_parent)) {
1113 list_del_rcu(&c->list);
1114 mroute_netlink_event(mrt, c, RTM_DELROUTE);
1122 static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
1123 struct mfcctl *mfc, int mrtsock, int parent)
1127 struct mfc_cache *uc, *c;
1129 if (mfc->mfcc_parent >= MAXVIFS)
1132 line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
1134 list_for_each_entry(c, &mrt->mfc_cache_array[line], list) {
1135 if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
1136 c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr &&
1137 (parent == -1 || parent == c->mfc_parent)) {
1144 write_lock_bh(&mrt_lock);
1145 c->mfc_parent = mfc->mfcc_parent;
1146 ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
1148 c->mfc_flags |= MFC_STATIC;
1149 write_unlock_bh(&mrt_lock);
1150 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1154 if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) &&
1155 !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
1158 c = ipmr_cache_alloc();
1162 c->mfc_origin = mfc->mfcc_origin.s_addr;
1163 c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
1164 c->mfc_parent = mfc->mfcc_parent;
1165 ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
1167 c->mfc_flags |= MFC_STATIC;
1169 list_add_rcu(&c->list, &mrt->mfc_cache_array[line]);
1172 * Check to see if we resolved a queued list. If so we
1173 * need to send on the frames and tidy up.
1176 spin_lock_bh(&mfc_unres_lock);
1177 list_for_each_entry(uc, &mrt->mfc_unres_queue, list) {
1178 if (uc->mfc_origin == c->mfc_origin &&
1179 uc->mfc_mcastgrp == c->mfc_mcastgrp) {
1180 list_del(&uc->list);
1181 atomic_dec(&mrt->cache_resolve_queue_len);
1186 if (list_empty(&mrt->mfc_unres_queue))
1187 del_timer(&mrt->ipmr_expire_timer);
1188 spin_unlock_bh(&mfc_unres_lock);
1191 ipmr_cache_resolve(net, mrt, uc, c);
1192 ipmr_cache_free(uc);
1194 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1199 * Close the multicast socket, and clear the vif tables etc
1202 static void mroute_clean_tables(struct mr_table *mrt)
1206 struct mfc_cache *c, *next;
1208 /* Shut down all active vif entries */
1210 for (i = 0; i < mrt->maxvif; i++) {
1211 if (!(mrt->vif_table[i].flags & VIFF_STATIC))
1212 vif_delete(mrt, i, 0, &list);
1214 unregister_netdevice_many(&list);
1216 /* Wipe the cache */
1218 for (i = 0; i < MFC_LINES; i++) {
1219 list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) {
1220 if (c->mfc_flags & MFC_STATIC)
1222 list_del_rcu(&c->list);
1223 mroute_netlink_event(mrt, c, RTM_DELROUTE);
1228 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1229 spin_lock_bh(&mfc_unres_lock);
1230 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
1232 mroute_netlink_event(mrt, c, RTM_DELROUTE);
1233 ipmr_destroy_unres(mrt, c);
1235 spin_unlock_bh(&mfc_unres_lock);
1239 /* called from ip_ra_control(), before an RCU grace period,
1240 * we dont need to call synchronize_rcu() here
1242 static void mrtsock_destruct(struct sock *sk)
1244 struct net *net = sock_net(sk);
1245 struct mr_table *mrt;
1248 ipmr_for_each_table(mrt, net) {
1249 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1250 IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
1251 inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
1252 NETCONFA_IFINDEX_ALL,
1253 net->ipv4.devconf_all);
1254 RCU_INIT_POINTER(mrt->mroute_sk, NULL);
1255 mroute_clean_tables(mrt);
1262 * Socket options and virtual interface manipulation. The whole
1263 * virtual interface system is a complete heap, but unfortunately
1264 * that's how BSD mrouted happens to think. Maybe one day with a proper
1265 * MOSPF/PIM router set up we can clean this up.
1268 int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1270 int ret, parent = 0;
1273 struct net *net = sock_net(sk);
1274 struct mr_table *mrt;
1276 if (sk->sk_type != SOCK_RAW ||
1277 inet_sk(sk)->inet_num != IPPROTO_IGMP)
1280 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1284 if (optname != MRT_INIT) {
1285 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
1286 !ns_capable(net->user_ns, CAP_NET_ADMIN))
1292 if (optlen != sizeof(int))
1296 if (rtnl_dereference(mrt->mroute_sk)) {
1301 ret = ip_ra_control(sk, 1, mrtsock_destruct);
1303 rcu_assign_pointer(mrt->mroute_sk, sk);
1304 IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
1305 inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
1306 NETCONFA_IFINDEX_ALL,
1307 net->ipv4.devconf_all);
1312 if (sk != rcu_access_pointer(mrt->mroute_sk))
1314 return ip_ra_control(sk, 0, NULL);
1317 if (optlen != sizeof(vif))
1319 if (copy_from_user(&vif, optval, sizeof(vif)))
1321 if (vif.vifc_vifi >= MAXVIFS)
1324 if (optname == MRT_ADD_VIF) {
1325 ret = vif_add(net, mrt, &vif,
1326 sk == rtnl_dereference(mrt->mroute_sk));
1328 ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
1334 * Manipulate the forwarding caches. These live
1335 * in a sort of kernel/user symbiosis.
1340 case MRT_ADD_MFC_PROXY:
1341 case MRT_DEL_MFC_PROXY:
1342 if (optlen != sizeof(mfc))
1344 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1347 parent = mfc.mfcc_parent;
1349 if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
1350 ret = ipmr_mfc_delete(mrt, &mfc, parent);
1352 ret = ipmr_mfc_add(net, mrt, &mfc,
1353 sk == rtnl_dereference(mrt->mroute_sk),
1358 * Control PIM assert.
1363 if (optlen != sizeof(v))
1365 if (get_user(v, (int __user *)optval))
1367 mrt->mroute_do_assert = v;
1370 #ifdef CONFIG_IP_PIMSM
1375 if (optlen != sizeof(v))
1377 if (get_user(v, (int __user *)optval))
1383 if (v != mrt->mroute_do_pim) {
1384 mrt->mroute_do_pim = v;
1385 mrt->mroute_do_assert = v;
1391 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
1396 if (optlen != sizeof(u32))
1398 if (get_user(v, (u32 __user *)optval))
1401 /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */
1402 if (v != RT_TABLE_DEFAULT && v >= 1000000000)
1407 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1410 if (!ipmr_new_table(net, v))
1413 raw_sk(sk)->ipmr_table = v;
1420 * Spurious command, or MRT_VERSION which you cannot
1424 return -ENOPROTOOPT;
1429 * Getsock opt support for the multicast routing system.
1432 int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen)
1436 struct net *net = sock_net(sk);
1437 struct mr_table *mrt;
1439 if (sk->sk_type != SOCK_RAW ||
1440 inet_sk(sk)->inet_num != IPPROTO_IGMP)
1443 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1447 if (optname != MRT_VERSION &&
1448 #ifdef CONFIG_IP_PIMSM
1449 optname != MRT_PIM &&
1451 optname != MRT_ASSERT)
1452 return -ENOPROTOOPT;
1454 if (get_user(olr, optlen))
1457 olr = min_t(unsigned int, olr, sizeof(int));
1461 if (put_user(olr, optlen))
1463 if (optname == MRT_VERSION)
1465 #ifdef CONFIG_IP_PIMSM
1466 else if (optname == MRT_PIM)
1467 val = mrt->mroute_do_pim;
1470 val = mrt->mroute_do_assert;
1471 if (copy_to_user(optval, &val, olr))
1477 * The IP multicast ioctl support routines.
1480 int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
1482 struct sioc_sg_req sr;
1483 struct sioc_vif_req vr;
1484 struct vif_device *vif;
1485 struct mfc_cache *c;
1486 struct net *net = sock_net(sk);
1487 struct mr_table *mrt;
1489 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1495 if (copy_from_user(&vr, arg, sizeof(vr)))
1497 if (vr.vifi >= mrt->maxvif)
1499 read_lock(&mrt_lock);
1500 vif = &mrt->vif_table[vr.vifi];
1501 if (VIF_EXISTS(mrt, vr.vifi)) {
1502 vr.icount = vif->pkt_in;
1503 vr.ocount = vif->pkt_out;
1504 vr.ibytes = vif->bytes_in;
1505 vr.obytes = vif->bytes_out;
1506 read_unlock(&mrt_lock);
1508 if (copy_to_user(arg, &vr, sizeof(vr)))
1512 read_unlock(&mrt_lock);
1513 return -EADDRNOTAVAIL;
1515 if (copy_from_user(&sr, arg, sizeof(sr)))
1519 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1521 sr.pktcnt = c->mfc_un.res.pkt;
1522 sr.bytecnt = c->mfc_un.res.bytes;
1523 sr.wrong_if = c->mfc_un.res.wrong_if;
1526 if (copy_to_user(arg, &sr, sizeof(sr)))
1531 return -EADDRNOTAVAIL;
1533 return -ENOIOCTLCMD;
1537 #ifdef CONFIG_COMPAT
1538 struct compat_sioc_sg_req {
1541 compat_ulong_t pktcnt;
1542 compat_ulong_t bytecnt;
1543 compat_ulong_t wrong_if;
1546 struct compat_sioc_vif_req {
1547 vifi_t vifi; /* Which iface */
1548 compat_ulong_t icount;
1549 compat_ulong_t ocount;
1550 compat_ulong_t ibytes;
1551 compat_ulong_t obytes;
1554 int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1556 struct compat_sioc_sg_req sr;
1557 struct compat_sioc_vif_req vr;
1558 struct vif_device *vif;
1559 struct mfc_cache *c;
1560 struct net *net = sock_net(sk);
1561 struct mr_table *mrt;
1563 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1569 if (copy_from_user(&vr, arg, sizeof(vr)))
1571 if (vr.vifi >= mrt->maxvif)
1573 read_lock(&mrt_lock);
1574 vif = &mrt->vif_table[vr.vifi];
1575 if (VIF_EXISTS(mrt, vr.vifi)) {
1576 vr.icount = vif->pkt_in;
1577 vr.ocount = vif->pkt_out;
1578 vr.ibytes = vif->bytes_in;
1579 vr.obytes = vif->bytes_out;
1580 read_unlock(&mrt_lock);
1582 if (copy_to_user(arg, &vr, sizeof(vr)))
1586 read_unlock(&mrt_lock);
1587 return -EADDRNOTAVAIL;
1589 if (copy_from_user(&sr, arg, sizeof(sr)))
1593 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1595 sr.pktcnt = c->mfc_un.res.pkt;
1596 sr.bytecnt = c->mfc_un.res.bytes;
1597 sr.wrong_if = c->mfc_un.res.wrong_if;
1600 if (copy_to_user(arg, &sr, sizeof(sr)))
1605 return -EADDRNOTAVAIL;
1607 return -ENOIOCTLCMD;
1613 static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
1615 struct net_device *dev = ptr;
1616 struct net *net = dev_net(dev);
1617 struct mr_table *mrt;
1618 struct vif_device *v;
1621 if (event != NETDEV_UNREGISTER)
1624 ipmr_for_each_table(mrt, net) {
1625 v = &mrt->vif_table[0];
1626 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1628 vif_delete(mrt, ct, 1, NULL);
1635 static struct notifier_block ip_mr_notifier = {
1636 .notifier_call = ipmr_device_event,
1640 * Encapsulate a packet by attaching a valid IPIP header to it.
1641 * This avoids tunnel drivers and other mess and gives us the speed so
1642 * important for multicast video.
1645 static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr)
1648 const struct iphdr *old_iph = ip_hdr(skb);
1650 skb_push(skb, sizeof(struct iphdr));
1651 skb->transport_header = skb->network_header;
1652 skb_reset_network_header(skb);
1656 iph->tos = old_iph->tos;
1657 iph->ttl = old_iph->ttl;
1661 iph->protocol = IPPROTO_IPIP;
1663 iph->tot_len = htons(skb->len);
1664 ip_select_ident(skb, skb_dst(skb), NULL);
1667 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1671 static inline int ipmr_forward_finish(struct sk_buff *skb)
1673 struct ip_options *opt = &(IPCB(skb)->opt);
1675 IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS);
1676 IP_ADD_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTOCTETS, skb->len);
1678 if (unlikely(opt->optlen))
1679 ip_forward_options(skb);
1681 return dst_output(skb);
1685 * Processing handlers for ipmr_forward
1688 static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
1689 struct sk_buff *skb, struct mfc_cache *c, int vifi)
1691 const struct iphdr *iph = ip_hdr(skb);
1692 struct vif_device *vif = &mrt->vif_table[vifi];
1693 struct net_device *dev;
1698 if (vif->dev == NULL)
1701 #ifdef CONFIG_IP_PIMSM
1702 if (vif->flags & VIFF_REGISTER) {
1704 vif->bytes_out += skb->len;
1705 vif->dev->stats.tx_bytes += skb->len;
1706 vif->dev->stats.tx_packets++;
1707 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
1712 if (vif->flags & VIFF_TUNNEL) {
1713 rt = ip_route_output_ports(net, &fl4, NULL,
1714 vif->remote, vif->local,
1717 RT_TOS(iph->tos), vif->link);
1720 encap = sizeof(struct iphdr);
1722 rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
1725 RT_TOS(iph->tos), vif->link);
1732 if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
1733 /* Do not fragment multicasts. Alas, IPv4 does not
1734 * allow to send ICMP, so that packets will disappear
1738 IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS);
1743 encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
1745 if (skb_cow(skb, encap)) {
1751 vif->bytes_out += skb->len;
1754 skb_dst_set(skb, &rt->dst);
1755 ip_decrease_ttl(ip_hdr(skb));
1757 /* FIXME: forward and output firewalls used to be called here.
1758 * What do we do with netfilter? -- RR
1760 if (vif->flags & VIFF_TUNNEL) {
1761 ip_encap(skb, vif->local, vif->remote);
1762 /* FIXME: extra output firewall step used to be here. --RR */
1763 vif->dev->stats.tx_packets++;
1764 vif->dev->stats.tx_bytes += skb->len;
1767 IPCB(skb)->flags |= IPSKB_FORWARDED;
1770 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1771 * not only before forwarding, but after forwarding on all output
1772 * interfaces. It is clear, if mrouter runs a multicasting
1773 * program, it should receive packets not depending to what interface
1774 * program is joined.
1775 * If we will not make it, the program will have to join on all
1776 * interfaces. On the other hand, multihoming host (or router, but
1777 * not mrouter) cannot join to more than one interface - it will
1778 * result in receiving multiple packets.
1780 NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, skb, skb->dev, dev,
1781 ipmr_forward_finish);
1788 static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev)
1792 for (ct = mrt->maxvif-1; ct >= 0; ct--) {
1793 if (mrt->vif_table[ct].dev == dev)
1799 /* "local" means that we should preserve one skb (for local delivery) */
1801 static int ip_mr_forward(struct net *net, struct mr_table *mrt,
1802 struct sk_buff *skb, struct mfc_cache *cache,
1807 int true_vifi = ipmr_find_vif(mrt, skb->dev);
1809 vif = cache->mfc_parent;
1810 cache->mfc_un.res.pkt++;
1811 cache->mfc_un.res.bytes += skb->len;
1813 if (cache->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
1814 struct mfc_cache *cache_proxy;
1816 /* For an (*,G) entry, we only check that the incomming
1817 * interface is part of the static tree.
1819 cache_proxy = ipmr_cache_find_any_parent(mrt, vif);
1821 cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
1826 * Wrong interface: drop packet and (maybe) send PIM assert.
1828 if (mrt->vif_table[vif].dev != skb->dev) {
1829 if (rt_is_output_route(skb_rtable(skb))) {
1830 /* It is our own packet, looped back.
1831 * Very complicated situation...
1833 * The best workaround until routing daemons will be
1834 * fixed is not to redistribute packet, if it was
1835 * send through wrong interface. It means, that
1836 * multicast applications WILL NOT work for
1837 * (S,G), which have default multicast route pointing
1838 * to wrong oif. In any case, it is not a good
1839 * idea to use multicasting applications on router.
1844 cache->mfc_un.res.wrong_if++;
1846 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1847 /* pimsm uses asserts, when switching from RPT to SPT,
1848 * so that we cannot check that packet arrived on an oif.
1849 * It is bad, but otherwise we would need to move pretty
1850 * large chunk of pimd to kernel. Ough... --ANK
1852 (mrt->mroute_do_pim ||
1853 cache->mfc_un.res.ttls[true_vifi] < 255) &&
1855 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
1856 cache->mfc_un.res.last_assert = jiffies;
1857 ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
1863 mrt->vif_table[vif].pkt_in++;
1864 mrt->vif_table[vif].bytes_in += skb->len;
1869 if (cache->mfc_origin == htonl(INADDR_ANY) &&
1870 cache->mfc_mcastgrp == htonl(INADDR_ANY)) {
1871 if (true_vifi >= 0 &&
1872 true_vifi != cache->mfc_parent &&
1874 cache->mfc_un.res.ttls[cache->mfc_parent]) {
1875 /* It's an (*,*) entry and the packet is not coming from
1876 * the upstream: forward the packet to the upstream
1879 psend = cache->mfc_parent;
1884 for (ct = cache->mfc_un.res.maxvif - 1;
1885 ct >= cache->mfc_un.res.minvif; ct--) {
1886 /* For (*,G) entry, don't forward to the incoming interface */
1887 if ((cache->mfc_origin != htonl(INADDR_ANY) ||
1889 ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
1891 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1894 ipmr_queue_xmit(net, mrt, skb2, cache,
1903 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1906 ipmr_queue_xmit(net, mrt, skb2, cache, psend);
1908 ipmr_queue_xmit(net, mrt, skb, cache, psend);
1919 static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
1921 struct rtable *rt = skb_rtable(skb);
1922 struct iphdr *iph = ip_hdr(skb);
1923 struct flowi4 fl4 = {
1924 .daddr = iph->daddr,
1925 .saddr = iph->saddr,
1926 .flowi4_tos = RT_TOS(iph->tos),
1927 .flowi4_oif = (rt_is_output_route(rt) ?
1928 skb->dev->ifindex : 0),
1929 .flowi4_iif = (rt_is_output_route(rt) ?
1932 .flowi4_mark = skb->mark,
1934 struct mr_table *mrt;
1937 err = ipmr_fib_lookup(net, &fl4, &mrt);
1939 return ERR_PTR(err);
1944 * Multicast packets for forwarding arrive here
1945 * Called with rcu_read_lock();
1948 int ip_mr_input(struct sk_buff *skb)
1950 struct mfc_cache *cache;
1951 struct net *net = dev_net(skb->dev);
1952 int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
1953 struct mr_table *mrt;
1955 /* Packet is looped back after forward, it should not be
1956 * forwarded second time, but still can be delivered locally.
1958 if (IPCB(skb)->flags & IPSKB_FORWARDED)
1961 mrt = ipmr_rt_fib_lookup(net, skb);
1964 return PTR_ERR(mrt);
1967 if (IPCB(skb)->opt.router_alert) {
1968 if (ip_call_ra_chain(skb))
1970 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
1971 /* IGMPv1 (and broken IGMPv2 implementations sort of
1972 * Cisco IOS <= 11.2(8)) do not put router alert
1973 * option to IGMP packets destined to routable
1974 * groups. It is very bad, because it means
1975 * that we can forward NO IGMP messages.
1977 struct sock *mroute_sk;
1979 mroute_sk = rcu_dereference(mrt->mroute_sk);
1982 raw_rcv(mroute_sk, skb);
1988 /* already under rcu_read_lock() */
1989 cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
1990 if (cache == NULL) {
1991 int vif = ipmr_find_vif(mrt, skb->dev);
1994 cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,
1999 * No usable cache entry
2001 if (cache == NULL) {
2005 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2006 ip_local_deliver(skb);
2012 read_lock(&mrt_lock);
2013 vif = ipmr_find_vif(mrt, skb->dev);
2015 int err2 = ipmr_cache_unresolved(mrt, vif, skb);
2016 read_unlock(&mrt_lock);
2020 read_unlock(&mrt_lock);
2025 read_lock(&mrt_lock);
2026 ip_mr_forward(net, mrt, skb, cache, local);
2027 read_unlock(&mrt_lock);
2030 return ip_local_deliver(skb);
2036 return ip_local_deliver(skb);
2041 #ifdef CONFIG_IP_PIMSM
2042 /* called with rcu_read_lock() */
2043 static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
2044 unsigned int pimlen)
2046 struct net_device *reg_dev = NULL;
2047 struct iphdr *encap;
2049 encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
2052 * a. packet is really sent to a multicast group
2053 * b. packet is not a NULL-REGISTER
2054 * c. packet is not truncated
2056 if (!ipv4_is_multicast(encap->daddr) ||
2057 encap->tot_len == 0 ||
2058 ntohs(encap->tot_len) + pimlen > skb->len)
2061 read_lock(&mrt_lock);
2062 if (mrt->mroute_reg_vif_num >= 0)
2063 reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev;
2064 read_unlock(&mrt_lock);
2066 if (reg_dev == NULL)
2069 skb->mac_header = skb->network_header;
2070 skb_pull(skb, (u8 *)encap - skb->data);
2071 skb_reset_network_header(skb);
2072 skb->protocol = htons(ETH_P_IP);
2073 skb->ip_summed = CHECKSUM_NONE;
2074 skb->pkt_type = PACKET_HOST;
2076 skb_tunnel_rx(skb, reg_dev);
2080 return NET_RX_SUCCESS;
2084 #ifdef CONFIG_IP_PIMSM_V1
2086 * Handle IGMP messages of PIMv1
2089 int pim_rcv_v1(struct sk_buff *skb)
2091 struct igmphdr *pim;
2092 struct net *net = dev_net(skb->dev);
2093 struct mr_table *mrt;
2095 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2098 pim = igmp_hdr(skb);
2100 mrt = ipmr_rt_fib_lookup(net, skb);
2103 if (!mrt->mroute_do_pim ||
2104 pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
2107 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2115 #ifdef CONFIG_IP_PIMSM_V2
2116 static int pim_rcv(struct sk_buff *skb)
2118 struct pimreghdr *pim;
2119 struct net *net = dev_net(skb->dev);
2120 struct mr_table *mrt;
2122 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2125 pim = (struct pimreghdr *)skb_transport_header(skb);
2126 if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) ||
2127 (pim->flags & PIM_NULL_REGISTER) ||
2128 (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
2129 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
2132 mrt = ipmr_rt_fib_lookup(net, skb);
2135 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2143 static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2144 struct mfc_cache *c, struct rtmsg *rtm)
2147 struct rtnexthop *nhp;
2148 struct nlattr *mp_attr;
2149 struct rta_mfc_stats mfcs;
2151 /* If cache is unresolved, don't try to parse IIF and OIF */
2152 if (c->mfc_parent >= MAXVIFS)
2155 if (VIF_EXISTS(mrt, c->mfc_parent) &&
2156 nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0)
2159 if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH)))
2162 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2163 if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2164 if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) {
2165 nla_nest_cancel(skb, mp_attr);
2169 nhp->rtnh_flags = 0;
2170 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2171 nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex;
2172 nhp->rtnh_len = sizeof(*nhp);
2176 nla_nest_end(skb, mp_attr);
2178 mfcs.mfcs_packets = c->mfc_un.res.pkt;
2179 mfcs.mfcs_bytes = c->mfc_un.res.bytes;
2180 mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
2181 if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0)
2184 rtm->rtm_type = RTN_MULTICAST;
2188 int ipmr_get_route(struct net *net, struct sk_buff *skb,
2189 __be32 saddr, __be32 daddr,
2190 struct rtmsg *rtm, int nowait)
2192 struct mfc_cache *cache;
2193 struct mr_table *mrt;
2196 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2201 cache = ipmr_cache_find(mrt, saddr, daddr);
2202 if (cache == NULL && skb->dev) {
2203 int vif = ipmr_find_vif(mrt, skb->dev);
2206 cache = ipmr_cache_find_any(mrt, daddr, vif);
2208 if (cache == NULL) {
2209 struct sk_buff *skb2;
2211 struct net_device *dev;
2220 read_lock(&mrt_lock);
2222 vif = ipmr_find_vif(mrt, dev);
2224 read_unlock(&mrt_lock);
2228 skb2 = skb_clone(skb, GFP_ATOMIC);
2230 read_unlock(&mrt_lock);
2235 skb_push(skb2, sizeof(struct iphdr));
2236 skb_reset_network_header(skb2);
2238 iph->ihl = sizeof(struct iphdr) >> 2;
2242 err = ipmr_cache_unresolved(mrt, vif, skb2);
2243 read_unlock(&mrt_lock);
2248 read_lock(&mrt_lock);
2249 if (!nowait && (rtm->rtm_flags & RTM_F_NOTIFY))
2250 cache->mfc_flags |= MFC_NOTIFY;
2251 err = __ipmr_fill_mroute(mrt, skb, cache, rtm);
2252 read_unlock(&mrt_lock);
2257 static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2258 u32 portid, u32 seq, struct mfc_cache *c, int cmd)
2260 struct nlmsghdr *nlh;
2264 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), NLM_F_MULTI);
2268 rtm = nlmsg_data(nlh);
2269 rtm->rtm_family = RTNL_FAMILY_IPMR;
2270 rtm->rtm_dst_len = 32;
2271 rtm->rtm_src_len = 32;
2273 rtm->rtm_table = mrt->id;
2274 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2275 goto nla_put_failure;
2276 rtm->rtm_type = RTN_MULTICAST;
2277 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2278 if (c->mfc_flags & MFC_STATIC)
2279 rtm->rtm_protocol = RTPROT_STATIC;
2281 rtm->rtm_protocol = RTPROT_MROUTED;
2284 if (nla_put_be32(skb, RTA_SRC, c->mfc_origin) ||
2285 nla_put_be32(skb, RTA_DST, c->mfc_mcastgrp))
2286 goto nla_put_failure;
2287 err = __ipmr_fill_mroute(mrt, skb, c, rtm);
2288 /* do not break the dump if cache is unresolved */
2289 if (err < 0 && err != -ENOENT)
2290 goto nla_put_failure;
2292 return nlmsg_end(skb, nlh);
2295 nlmsg_cancel(skb, nlh);
2299 static size_t mroute_msgsize(bool unresolved, int maxvif)
2302 NLMSG_ALIGN(sizeof(struct rtmsg))
2303 + nla_total_size(4) /* RTA_TABLE */
2304 + nla_total_size(4) /* RTA_SRC */
2305 + nla_total_size(4) /* RTA_DST */
2310 + nla_total_size(4) /* RTA_IIF */
2311 + nla_total_size(0) /* RTA_MULTIPATH */
2312 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2314 + nla_total_size(sizeof(struct rta_mfc_stats))
2320 static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
2323 struct net *net = read_pnet(&mrt->net);
2324 struct sk_buff *skb;
2327 skb = nlmsg_new(mroute_msgsize(mfc->mfc_parent >= MAXVIFS, mrt->maxvif),
2332 err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd);
2336 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC);
2342 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err);
2345 static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2347 struct net *net = sock_net(skb->sk);
2348 struct mr_table *mrt;
2349 struct mfc_cache *mfc;
2350 unsigned int t = 0, s_t;
2351 unsigned int h = 0, s_h;
2352 unsigned int e = 0, s_e;
2359 ipmr_for_each_table(mrt, net) {
2364 for (h = s_h; h < MFC_LINES; h++) {
2365 list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) {
2368 if (ipmr_fill_mroute(mrt, skb,
2369 NETLINK_CB(cb->skb).portid,
2371 mfc, RTM_NEWROUTE) < 0)
2378 spin_lock_bh(&mfc_unres_lock);
2379 list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) {
2382 if (ipmr_fill_mroute(mrt, skb,
2383 NETLINK_CB(cb->skb).portid,
2385 mfc, RTM_NEWROUTE) < 0) {
2386 spin_unlock_bh(&mfc_unres_lock);
2392 spin_unlock_bh(&mfc_unres_lock);
2408 #ifdef CONFIG_PROC_FS
2410 * The /proc interfaces to multicast routing :
2411 * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
2413 struct ipmr_vif_iter {
2414 struct seq_net_private p;
2415 struct mr_table *mrt;
2419 static struct vif_device *ipmr_vif_seq_idx(struct net *net,
2420 struct ipmr_vif_iter *iter,
2423 struct mr_table *mrt = iter->mrt;
2425 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
2426 if (!VIF_EXISTS(mrt, iter->ct))
2429 return &mrt->vif_table[iter->ct];
2434 static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
2435 __acquires(mrt_lock)
2437 struct ipmr_vif_iter *iter = seq->private;
2438 struct net *net = seq_file_net(seq);
2439 struct mr_table *mrt;
2441 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2443 return ERR_PTR(-ENOENT);
2447 read_lock(&mrt_lock);
2448 return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1)
2452 static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2454 struct ipmr_vif_iter *iter = seq->private;
2455 struct net *net = seq_file_net(seq);
2456 struct mr_table *mrt = iter->mrt;
2459 if (v == SEQ_START_TOKEN)
2460 return ipmr_vif_seq_idx(net, iter, 0);
2462 while (++iter->ct < mrt->maxvif) {
2463 if (!VIF_EXISTS(mrt, iter->ct))
2465 return &mrt->vif_table[iter->ct];
2470 static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
2471 __releases(mrt_lock)
2473 read_unlock(&mrt_lock);
2476 static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
2478 struct ipmr_vif_iter *iter = seq->private;
2479 struct mr_table *mrt = iter->mrt;
2481 if (v == SEQ_START_TOKEN) {
2483 "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n");
2485 const struct vif_device *vif = v;
2486 const char *name = vif->dev ? vif->dev->name : "none";
2489 "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n",
2490 vif - mrt->vif_table,
2491 name, vif->bytes_in, vif->pkt_in,
2492 vif->bytes_out, vif->pkt_out,
2493 vif->flags, vif->local, vif->remote);
2498 static const struct seq_operations ipmr_vif_seq_ops = {
2499 .start = ipmr_vif_seq_start,
2500 .next = ipmr_vif_seq_next,
2501 .stop = ipmr_vif_seq_stop,
2502 .show = ipmr_vif_seq_show,
2505 static int ipmr_vif_open(struct inode *inode, struct file *file)
2507 return seq_open_net(inode, file, &ipmr_vif_seq_ops,
2508 sizeof(struct ipmr_vif_iter));
2511 static const struct file_operations ipmr_vif_fops = {
2512 .owner = THIS_MODULE,
2513 .open = ipmr_vif_open,
2515 .llseek = seq_lseek,
2516 .release = seq_release_net,
2519 struct ipmr_mfc_iter {
2520 struct seq_net_private p;
2521 struct mr_table *mrt;
2522 struct list_head *cache;
2527 static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net,
2528 struct ipmr_mfc_iter *it, loff_t pos)
2530 struct mr_table *mrt = it->mrt;
2531 struct mfc_cache *mfc;
2534 for (it->ct = 0; it->ct < MFC_LINES; it->ct++) {
2535 it->cache = &mrt->mfc_cache_array[it->ct];
2536 list_for_each_entry_rcu(mfc, it->cache, list)
2542 spin_lock_bh(&mfc_unres_lock);
2543 it->cache = &mrt->mfc_unres_queue;
2544 list_for_each_entry(mfc, it->cache, list)
2547 spin_unlock_bh(&mfc_unres_lock);
2554 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
2556 struct ipmr_mfc_iter *it = seq->private;
2557 struct net *net = seq_file_net(seq);
2558 struct mr_table *mrt;
2560 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2562 return ERR_PTR(-ENOENT);
2567 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
2571 static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2573 struct mfc_cache *mfc = v;
2574 struct ipmr_mfc_iter *it = seq->private;
2575 struct net *net = seq_file_net(seq);
2576 struct mr_table *mrt = it->mrt;
2580 if (v == SEQ_START_TOKEN)
2581 return ipmr_mfc_seq_idx(net, seq->private, 0);
2583 if (mfc->list.next != it->cache)
2584 return list_entry(mfc->list.next, struct mfc_cache, list);
2586 if (it->cache == &mrt->mfc_unres_queue)
2589 BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]);
2591 while (++it->ct < MFC_LINES) {
2592 it->cache = &mrt->mfc_cache_array[it->ct];
2593 if (list_empty(it->cache))
2595 return list_first_entry(it->cache, struct mfc_cache, list);
2598 /* exhausted cache_array, show unresolved */
2600 it->cache = &mrt->mfc_unres_queue;
2603 spin_lock_bh(&mfc_unres_lock);
2604 if (!list_empty(it->cache))
2605 return list_first_entry(it->cache, struct mfc_cache, list);
2608 spin_unlock_bh(&mfc_unres_lock);
2614 static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
2616 struct ipmr_mfc_iter *it = seq->private;
2617 struct mr_table *mrt = it->mrt;
2619 if (it->cache == &mrt->mfc_unres_queue)
2620 spin_unlock_bh(&mfc_unres_lock);
2621 else if (it->cache == &mrt->mfc_cache_array[it->ct])
2625 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
2629 if (v == SEQ_START_TOKEN) {
2631 "Group Origin Iif Pkts Bytes Wrong Oifs\n");
2633 const struct mfc_cache *mfc = v;
2634 const struct ipmr_mfc_iter *it = seq->private;
2635 const struct mr_table *mrt = it->mrt;
2637 seq_printf(seq, "%08X %08X %-3hd",
2638 (__force u32) mfc->mfc_mcastgrp,
2639 (__force u32) mfc->mfc_origin,
2642 if (it->cache != &mrt->mfc_unres_queue) {
2643 seq_printf(seq, " %8lu %8lu %8lu",
2644 mfc->mfc_un.res.pkt,
2645 mfc->mfc_un.res.bytes,
2646 mfc->mfc_un.res.wrong_if);
2647 for (n = mfc->mfc_un.res.minvif;
2648 n < mfc->mfc_un.res.maxvif; n++) {
2649 if (VIF_EXISTS(mrt, n) &&
2650 mfc->mfc_un.res.ttls[n] < 255)
2653 n, mfc->mfc_un.res.ttls[n]);
2656 /* unresolved mfc_caches don't contain
2657 * pkt, bytes and wrong_if values
2659 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
2661 seq_putc(seq, '\n');
2666 static const struct seq_operations ipmr_mfc_seq_ops = {
2667 .start = ipmr_mfc_seq_start,
2668 .next = ipmr_mfc_seq_next,
2669 .stop = ipmr_mfc_seq_stop,
2670 .show = ipmr_mfc_seq_show,
2673 static int ipmr_mfc_open(struct inode *inode, struct file *file)
2675 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
2676 sizeof(struct ipmr_mfc_iter));
2679 static const struct file_operations ipmr_mfc_fops = {
2680 .owner = THIS_MODULE,
2681 .open = ipmr_mfc_open,
2683 .llseek = seq_lseek,
2684 .release = seq_release_net,
2688 #ifdef CONFIG_IP_PIMSM_V2
2689 static const struct net_protocol pim_protocol = {
2697 * Setup for IP multicast routing
2699 static int __net_init ipmr_net_init(struct net *net)
2703 err = ipmr_rules_init(net);
2707 #ifdef CONFIG_PROC_FS
2709 if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops))
2711 if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops))
2712 goto proc_cache_fail;
2716 #ifdef CONFIG_PROC_FS
2718 remove_proc_entry("ip_mr_vif", net->proc_net);
2720 ipmr_rules_exit(net);
2726 static void __net_exit ipmr_net_exit(struct net *net)
2728 #ifdef CONFIG_PROC_FS
2729 remove_proc_entry("ip_mr_cache", net->proc_net);
2730 remove_proc_entry("ip_mr_vif", net->proc_net);
2732 ipmr_rules_exit(net);
2735 static struct pernet_operations ipmr_net_ops = {
2736 .init = ipmr_net_init,
2737 .exit = ipmr_net_exit,
2740 int __init ip_mr_init(void)
2744 mrt_cachep = kmem_cache_create("ip_mrt_cache",
2745 sizeof(struct mfc_cache),
2746 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
2751 err = register_pernet_subsys(&ipmr_net_ops);
2753 goto reg_pernet_fail;
2755 err = register_netdevice_notifier(&ip_mr_notifier);
2757 goto reg_notif_fail;
2758 #ifdef CONFIG_IP_PIMSM_V2
2759 if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
2760 pr_err("%s: can't add PIM protocol\n", __func__);
2762 goto add_proto_fail;
2765 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
2766 NULL, ipmr_rtm_dumproute, NULL);
2769 #ifdef CONFIG_IP_PIMSM_V2
2771 unregister_netdevice_notifier(&ip_mr_notifier);
2774 unregister_pernet_subsys(&ipmr_net_ops);
2776 kmem_cache_destroy(mrt_cachep);