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>
69 #include <net/nexthop.h>
72 struct fib_rule common;
79 /* Big lock, protecting vif table, mrt cache and mroute socket state.
80 * Note that the changes are semaphored via rtnl_lock.
83 static DEFINE_RWLOCK(mrt_lock);
85 /* Multicast router control variables */
87 /* Special spinlock for queue of unresolved entries */
88 static DEFINE_SPINLOCK(mfc_unres_lock);
90 /* We return to original Alan's scheme. Hash table of resolved
91 * entries is changed only in process context and protected
92 * with weak lock mrt_lock. Queue of unresolved entries is protected
93 * with strong spinlock mfc_unres_lock.
95 * In this case data path is free of exclusive locks at all.
98 static struct kmem_cache *mrt_cachep __read_mostly;
100 static struct mr_table *ipmr_new_table(struct net *net, u32 id);
101 static void ipmr_free_table(struct mr_table *mrt);
103 static void ip_mr_forward(struct net *net, struct mr_table *mrt,
104 struct sk_buff *skb, struct mfc_cache *cache,
106 static int ipmr_cache_report(struct mr_table *mrt,
107 struct sk_buff *pkt, vifi_t vifi, int assert);
108 static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
109 struct mfc_cache *c, struct rtmsg *rtm);
110 static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
112 static void mroute_clean_tables(struct mr_table *mrt, bool all);
113 static void ipmr_expire_process(unsigned long arg);
115 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
116 #define ipmr_for_each_table(mrt, net) \
117 list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list)
119 static struct mr_table *ipmr_get_table(struct net *net, u32 id)
121 struct mr_table *mrt;
123 ipmr_for_each_table(mrt, net) {
130 static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
131 struct mr_table **mrt)
134 struct ipmr_result res;
135 struct fib_lookup_arg arg = {
137 .flags = FIB_LOOKUP_NOREF,
140 err = fib_rules_lookup(net->ipv4.mr_rules_ops,
141 flowi4_to_flowi(flp4), 0, &arg);
148 static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp,
149 int flags, struct fib_lookup_arg *arg)
151 struct ipmr_result *res = arg->result;
152 struct mr_table *mrt;
154 switch (rule->action) {
157 case FR_ACT_UNREACHABLE:
159 case FR_ACT_PROHIBIT:
161 case FR_ACT_BLACKHOLE:
166 mrt = ipmr_get_table(rule->fr_net, rule->table);
173 static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
178 static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = {
182 static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
183 struct fib_rule_hdr *frh, struct nlattr **tb)
188 static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
194 static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
195 struct fib_rule_hdr *frh)
203 static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = {
204 .family = RTNL_FAMILY_IPMR,
205 .rule_size = sizeof(struct ipmr_rule),
206 .addr_size = sizeof(u32),
207 .action = ipmr_rule_action,
208 .match = ipmr_rule_match,
209 .configure = ipmr_rule_configure,
210 .compare = ipmr_rule_compare,
211 .fill = ipmr_rule_fill,
212 .nlgroup = RTNLGRP_IPV4_RULE,
213 .policy = ipmr_rule_policy,
214 .owner = THIS_MODULE,
217 static int __net_init ipmr_rules_init(struct net *net)
219 struct fib_rules_ops *ops;
220 struct mr_table *mrt;
223 ops = fib_rules_register(&ipmr_rules_ops_template, net);
227 INIT_LIST_HEAD(&net->ipv4.mr_tables);
229 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
235 err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0);
239 net->ipv4.mr_rules_ops = ops;
243 ipmr_free_table(mrt);
245 fib_rules_unregister(ops);
249 static void __net_exit ipmr_rules_exit(struct net *net)
251 struct mr_table *mrt, *next;
254 list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
255 list_del(&mrt->list);
256 ipmr_free_table(mrt);
258 fib_rules_unregister(net->ipv4.mr_rules_ops);
262 #define ipmr_for_each_table(mrt, net) \
263 for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
265 static struct mr_table *ipmr_get_table(struct net *net, u32 id)
267 return net->ipv4.mrt;
270 static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
271 struct mr_table **mrt)
273 *mrt = net->ipv4.mrt;
277 static int __net_init ipmr_rules_init(struct net *net)
279 struct mr_table *mrt;
281 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
288 static void __net_exit ipmr_rules_exit(struct net *net)
291 ipmr_free_table(net->ipv4.mrt);
292 net->ipv4.mrt = NULL;
297 static struct mr_table *ipmr_new_table(struct net *net, u32 id)
299 struct mr_table *mrt;
302 /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */
303 if (id != RT_TABLE_DEFAULT && id >= 1000000000)
304 return ERR_PTR(-EINVAL);
306 mrt = ipmr_get_table(net, id);
310 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
312 return ERR_PTR(-ENOMEM);
313 write_pnet(&mrt->net, net);
316 /* Forwarding cache */
317 for (i = 0; i < MFC_LINES; i++)
318 INIT_LIST_HEAD(&mrt->mfc_cache_array[i]);
320 INIT_LIST_HEAD(&mrt->mfc_unres_queue);
322 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
325 mrt->mroute_reg_vif_num = -1;
326 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
327 list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
332 static void ipmr_free_table(struct mr_table *mrt)
334 del_timer_sync(&mrt->ipmr_expire_timer);
335 mroute_clean_tables(mrt, true);
339 /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
341 static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v)
343 struct net *net = dev_net(dev);
347 dev = __dev_get_by_name(net, "tunl0");
349 const struct net_device_ops *ops = dev->netdev_ops;
351 struct ip_tunnel_parm p;
353 memset(&p, 0, sizeof(p));
354 p.iph.daddr = v->vifc_rmt_addr.s_addr;
355 p.iph.saddr = v->vifc_lcl_addr.s_addr;
358 p.iph.protocol = IPPROTO_IPIP;
359 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
360 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
362 if (ops->ndo_do_ioctl) {
363 mm_segment_t oldfs = get_fs();
366 ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL);
372 /* Initialize ipmr pimreg/tunnel in_device */
373 static bool ipmr_init_vif_indev(const struct net_device *dev)
375 struct in_device *in_dev;
379 in_dev = __in_dev_get_rtnl(dev);
382 ipv4_devconf_setall(in_dev);
383 neigh_parms_data_state_setall(in_dev->arp_parms);
384 IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
389 static 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;
401 memset(&p, 0, sizeof(p));
402 p.iph.daddr = v->vifc_rmt_addr.s_addr;
403 p.iph.saddr = v->vifc_lcl_addr.s_addr;
406 p.iph.protocol = IPPROTO_IPIP;
407 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
408 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
410 if (ops->ndo_do_ioctl) {
411 mm_segment_t oldfs = get_fs();
414 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
422 (dev = __dev_get_by_name(net, p.name)) != NULL) {
423 dev->flags |= IFF_MULTICAST;
424 if (!ipmr_init_vif_indev(dev))
434 unregister_netdevice(dev);
438 #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
439 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
441 struct net *net = dev_net(dev);
442 struct mr_table *mrt;
443 struct flowi4 fl4 = {
444 .flowi4_oif = dev->ifindex,
445 .flowi4_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
446 .flowi4_mark = skb->mark,
450 err = ipmr_fib_lookup(net, &fl4, &mrt);
456 read_lock(&mrt_lock);
457 dev->stats.tx_bytes += skb->len;
458 dev->stats.tx_packets++;
459 ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT);
460 read_unlock(&mrt_lock);
465 static int reg_vif_get_iflink(const struct net_device *dev)
470 static const struct net_device_ops reg_vif_netdev_ops = {
471 .ndo_start_xmit = reg_vif_xmit,
472 .ndo_get_iflink = reg_vif_get_iflink,
475 static void reg_vif_setup(struct net_device *dev)
477 dev->type = ARPHRD_PIMREG;
478 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
479 dev->flags = IFF_NOARP;
480 dev->netdev_ops = ®_vif_netdev_ops;
481 dev->destructor = free_netdev;
482 dev->features |= NETIF_F_NETNS_LOCAL;
485 static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
487 struct net_device *dev;
490 if (mrt->id == RT_TABLE_DEFAULT)
491 sprintf(name, "pimreg");
493 sprintf(name, "pimreg%u", mrt->id);
495 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
500 dev_net_set(dev, net);
502 if (register_netdevice(dev)) {
507 if (!ipmr_init_vif_indev(dev))
517 unregister_netdevice(dev);
521 /* called with rcu_read_lock() */
522 static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
525 struct net_device *reg_dev = NULL;
528 encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
530 * a. packet is really sent to a multicast group
531 * b. packet is not a NULL-REGISTER
532 * c. packet is not truncated
534 if (!ipv4_is_multicast(encap->daddr) ||
535 encap->tot_len == 0 ||
536 ntohs(encap->tot_len) + pimlen > skb->len)
539 read_lock(&mrt_lock);
540 if (mrt->mroute_reg_vif_num >= 0)
541 reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev;
542 read_unlock(&mrt_lock);
547 skb->mac_header = skb->network_header;
548 skb_pull(skb, (u8 *)encap - skb->data);
549 skb_reset_network_header(skb);
550 skb->protocol = htons(ETH_P_IP);
551 skb->ip_summed = CHECKSUM_NONE;
553 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
557 return NET_RX_SUCCESS;
560 static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
567 * vif_delete - Delete a VIF entry
568 * @notify: Set to 1, if the caller is a notifier_call
570 static int vif_delete(struct mr_table *mrt, int vifi, int notify,
571 struct list_head *head)
573 struct vif_device *v;
574 struct net_device *dev;
575 struct in_device *in_dev;
577 if (vifi < 0 || vifi >= mrt->maxvif)
578 return -EADDRNOTAVAIL;
580 v = &mrt->vif_table[vifi];
582 write_lock_bh(&mrt_lock);
587 write_unlock_bh(&mrt_lock);
588 return -EADDRNOTAVAIL;
591 if (vifi == mrt->mroute_reg_vif_num)
592 mrt->mroute_reg_vif_num = -1;
594 if (vifi + 1 == mrt->maxvif) {
597 for (tmp = vifi - 1; tmp >= 0; tmp--) {
598 if (VIF_EXISTS(mrt, tmp))
604 write_unlock_bh(&mrt_lock);
606 dev_set_allmulti(dev, -1);
608 in_dev = __in_dev_get_rtnl(dev);
610 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
611 inet_netconf_notify_devconf(dev_net(dev),
612 NETCONFA_MC_FORWARDING,
613 dev->ifindex, &in_dev->cnf);
614 ip_rt_multicast_event(in_dev);
617 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
618 unregister_netdevice_queue(dev, head);
624 static void ipmr_cache_free_rcu(struct rcu_head *head)
626 struct mfc_cache *c = container_of(head, struct mfc_cache, rcu);
628 kmem_cache_free(mrt_cachep, c);
631 static inline void ipmr_cache_free(struct mfc_cache *c)
633 call_rcu(&c->rcu, ipmr_cache_free_rcu);
636 /* Destroy an unresolved cache entry, killing queued skbs
637 * and reporting error to netlink readers.
639 static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
641 struct net *net = read_pnet(&mrt->net);
645 atomic_dec(&mrt->cache_resolve_queue_len);
647 while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) {
648 if (ip_hdr(skb)->version == 0) {
649 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
650 nlh->nlmsg_type = NLMSG_ERROR;
651 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
652 skb_trim(skb, nlh->nlmsg_len);
654 e->error = -ETIMEDOUT;
655 memset(&e->msg, 0, sizeof(e->msg));
657 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
666 /* Timer process for the unresolved queue. */
667 static void ipmr_expire_process(unsigned long arg)
669 struct mr_table *mrt = (struct mr_table *)arg;
671 unsigned long expires;
672 struct mfc_cache *c, *next;
674 if (!spin_trylock(&mfc_unres_lock)) {
675 mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
679 if (list_empty(&mrt->mfc_unres_queue))
685 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
686 if (time_after(c->mfc_un.unres.expires, now)) {
687 unsigned long interval = c->mfc_un.unres.expires - now;
688 if (interval < expires)
694 mroute_netlink_event(mrt, c, RTM_DELROUTE);
695 ipmr_destroy_unres(mrt, c);
698 if (!list_empty(&mrt->mfc_unres_queue))
699 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
702 spin_unlock(&mfc_unres_lock);
705 /* Fill oifs list. It is called under write locked mrt_lock. */
706 static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache,
711 cache->mfc_un.res.minvif = MAXVIFS;
712 cache->mfc_un.res.maxvif = 0;
713 memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
715 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
716 if (VIF_EXISTS(mrt, vifi) &&
717 ttls[vifi] && ttls[vifi] < 255) {
718 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
719 if (cache->mfc_un.res.minvif > vifi)
720 cache->mfc_un.res.minvif = vifi;
721 if (cache->mfc_un.res.maxvif <= vifi)
722 cache->mfc_un.res.maxvif = vifi + 1;
727 static int vif_add(struct net *net, struct mr_table *mrt,
728 struct vifctl *vifc, int mrtsock)
730 int vifi = vifc->vifc_vifi;
731 struct vif_device *v = &mrt->vif_table[vifi];
732 struct net_device *dev;
733 struct in_device *in_dev;
737 if (VIF_EXISTS(mrt, vifi))
740 switch (vifc->vifc_flags) {
742 if (!ipmr_pimsm_enabled())
744 /* Special Purpose VIF in PIM
745 * All the packets will be sent to the daemon
747 if (mrt->mroute_reg_vif_num >= 0)
749 dev = ipmr_reg_vif(net, mrt);
752 err = dev_set_allmulti(dev, 1);
754 unregister_netdevice(dev);
760 dev = ipmr_new_tunnel(net, vifc);
763 err = dev_set_allmulti(dev, 1);
765 ipmr_del_tunnel(dev, vifc);
770 case VIFF_USE_IFINDEX:
772 if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
773 dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
774 if (dev && !__in_dev_get_rtnl(dev)) {
776 return -EADDRNOTAVAIL;
779 dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
782 return -EADDRNOTAVAIL;
783 err = dev_set_allmulti(dev, 1);
793 in_dev = __in_dev_get_rtnl(dev);
796 return -EADDRNOTAVAIL;
798 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
799 inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, dev->ifindex,
801 ip_rt_multicast_event(in_dev);
803 /* Fill in the VIF structures */
805 v->rate_limit = vifc->vifc_rate_limit;
806 v->local = vifc->vifc_lcl_addr.s_addr;
807 v->remote = vifc->vifc_rmt_addr.s_addr;
808 v->flags = vifc->vifc_flags;
810 v->flags |= VIFF_STATIC;
811 v->threshold = vifc->vifc_threshold;
816 v->link = dev->ifindex;
817 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER))
818 v->link = dev_get_iflink(dev);
820 /* And finish update writing critical data */
821 write_lock_bh(&mrt_lock);
823 if (v->flags & VIFF_REGISTER)
824 mrt->mroute_reg_vif_num = vifi;
825 if (vifi+1 > mrt->maxvif)
826 mrt->maxvif = vifi+1;
827 write_unlock_bh(&mrt_lock);
831 /* called with rcu_read_lock() */
832 static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
836 int line = MFC_HASH(mcastgrp, origin);
839 list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) {
840 if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp)
846 /* Look for a (*,*,oif) entry */
847 static struct mfc_cache *ipmr_cache_find_any_parent(struct mr_table *mrt,
850 int line = MFC_HASH(htonl(INADDR_ANY), htonl(INADDR_ANY));
853 list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list)
854 if (c->mfc_origin == htonl(INADDR_ANY) &&
855 c->mfc_mcastgrp == htonl(INADDR_ANY) &&
856 c->mfc_un.res.ttls[vifi] < 255)
862 /* Look for a (*,G) entry */
863 static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt,
864 __be32 mcastgrp, int vifi)
866 int line = MFC_HASH(mcastgrp, htonl(INADDR_ANY));
867 struct mfc_cache *c, *proxy;
869 if (mcastgrp == htonl(INADDR_ANY))
872 list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list)
873 if (c->mfc_origin == htonl(INADDR_ANY) &&
874 c->mfc_mcastgrp == mcastgrp) {
875 if (c->mfc_un.res.ttls[vifi] < 255)
878 /* It's ok if the vifi is part of the static tree */
879 proxy = ipmr_cache_find_any_parent(mrt,
881 if (proxy && proxy->mfc_un.res.ttls[vifi] < 255)
886 return ipmr_cache_find_any_parent(mrt, vifi);
889 /* Allocate a multicast cache entry */
890 static struct mfc_cache *ipmr_cache_alloc(void)
892 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
895 c->mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
896 c->mfc_un.res.minvif = MAXVIFS;
901 static struct mfc_cache *ipmr_cache_alloc_unres(void)
903 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
906 skb_queue_head_init(&c->mfc_un.unres.unresolved);
907 c->mfc_un.unres.expires = jiffies + 10*HZ;
912 /* A cache entry has gone into a resolved state from queued */
913 static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
914 struct mfc_cache *uc, struct mfc_cache *c)
919 /* Play the pending entries through our router */
920 while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
921 if (ip_hdr(skb)->version == 0) {
922 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
924 if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
925 nlh->nlmsg_len = skb_tail_pointer(skb) -
928 nlh->nlmsg_type = NLMSG_ERROR;
929 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
930 skb_trim(skb, nlh->nlmsg_len);
932 e->error = -EMSGSIZE;
933 memset(&e->msg, 0, sizeof(e->msg));
936 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
938 ip_mr_forward(net, mrt, skb, c, 0);
943 /* Bounce a cache query up to mrouted. We could use netlink for this but mrouted
944 * expects the following bizarre scheme.
946 * Called under mrt_lock.
948 static int ipmr_cache_report(struct mr_table *mrt,
949 struct sk_buff *pkt, vifi_t vifi, int assert)
951 const int ihl = ip_hdrlen(pkt);
952 struct sock *mroute_sk;
953 struct igmphdr *igmp;
958 if (assert == IGMPMSG_WHOLEPKT)
959 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
961 skb = alloc_skb(128, GFP_ATOMIC);
966 if (assert == IGMPMSG_WHOLEPKT) {
967 /* Ugly, but we have no choice with this interface.
968 * Duplicate old header, fix ihl, length etc.
969 * And all this only to mangle msg->im_msgtype and
970 * to set msg->im_mbz to "mbz" :-)
972 skb_push(skb, sizeof(struct iphdr));
973 skb_reset_network_header(skb);
974 skb_reset_transport_header(skb);
975 msg = (struct igmpmsg *)skb_network_header(skb);
976 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
977 msg->im_msgtype = IGMPMSG_WHOLEPKT;
979 msg->im_vif = mrt->mroute_reg_vif_num;
980 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
981 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
982 sizeof(struct iphdr));
984 /* Copy the IP header */
985 skb_set_network_header(skb, skb->len);
987 skb_copy_to_linear_data(skb, pkt->data, ihl);
988 /* Flag to the kernel this is a route add */
989 ip_hdr(skb)->protocol = 0;
990 msg = (struct igmpmsg *)skb_network_header(skb);
992 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
994 igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
996 msg->im_msgtype = assert;
998 ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
999 skb->transport_header = skb->network_header;
1003 mroute_sk = rcu_dereference(mrt->mroute_sk);
1010 /* Deliver to mrouted */
1011 ret = sock_queue_rcv_skb(mroute_sk, skb);
1014 net_warn_ratelimited("mroute: pending queue full, dropping entries\n");
1021 /* Queue a packet for resolution. It gets locked cache entry! */
1022 static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi,
1023 struct sk_buff *skb)
1027 struct mfc_cache *c;
1028 const struct iphdr *iph = ip_hdr(skb);
1030 spin_lock_bh(&mfc_unres_lock);
1031 list_for_each_entry(c, &mrt->mfc_unres_queue, list) {
1032 if (c->mfc_mcastgrp == iph->daddr &&
1033 c->mfc_origin == iph->saddr) {
1040 /* Create a new entry if allowable */
1041 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1042 (c = ipmr_cache_alloc_unres()) == NULL) {
1043 spin_unlock_bh(&mfc_unres_lock);
1049 /* Fill in the new cache entry */
1051 c->mfc_origin = iph->saddr;
1052 c->mfc_mcastgrp = iph->daddr;
1054 /* Reflect first query at mrouted. */
1055 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
1057 /* If the report failed throw the cache entry
1060 spin_unlock_bh(&mfc_unres_lock);
1067 atomic_inc(&mrt->cache_resolve_queue_len);
1068 list_add(&c->list, &mrt->mfc_unres_queue);
1069 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1071 if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
1072 mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires);
1075 /* See if we can append the packet */
1076 if (c->mfc_un.unres.unresolved.qlen > 3) {
1080 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1084 spin_unlock_bh(&mfc_unres_lock);
1088 /* MFC cache manipulation by user space mroute daemon */
1090 static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
1093 struct mfc_cache *c, *next;
1095 line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
1097 list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) {
1098 if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
1099 c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr &&
1100 (parent == -1 || parent == c->mfc_parent)) {
1101 list_del_rcu(&c->list);
1102 mroute_netlink_event(mrt, c, RTM_DELROUTE);
1110 static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
1111 struct mfcctl *mfc, int mrtsock, int parent)
1115 struct mfc_cache *uc, *c;
1117 if (mfc->mfcc_parent >= MAXVIFS)
1120 line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
1122 list_for_each_entry(c, &mrt->mfc_cache_array[line], list) {
1123 if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
1124 c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr &&
1125 (parent == -1 || parent == c->mfc_parent)) {
1132 write_lock_bh(&mrt_lock);
1133 c->mfc_parent = mfc->mfcc_parent;
1134 ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
1136 c->mfc_flags |= MFC_STATIC;
1137 write_unlock_bh(&mrt_lock);
1138 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1142 if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) &&
1143 !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
1146 c = ipmr_cache_alloc();
1150 c->mfc_origin = mfc->mfcc_origin.s_addr;
1151 c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
1152 c->mfc_parent = mfc->mfcc_parent;
1153 ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
1155 c->mfc_flags |= MFC_STATIC;
1157 list_add_rcu(&c->list, &mrt->mfc_cache_array[line]);
1159 /* Check to see if we resolved a queued list. If so we
1160 * need to send on the frames and tidy up.
1163 spin_lock_bh(&mfc_unres_lock);
1164 list_for_each_entry(uc, &mrt->mfc_unres_queue, list) {
1165 if (uc->mfc_origin == c->mfc_origin &&
1166 uc->mfc_mcastgrp == c->mfc_mcastgrp) {
1167 list_del(&uc->list);
1168 atomic_dec(&mrt->cache_resolve_queue_len);
1173 if (list_empty(&mrt->mfc_unres_queue))
1174 del_timer(&mrt->ipmr_expire_timer);
1175 spin_unlock_bh(&mfc_unres_lock);
1178 ipmr_cache_resolve(net, mrt, uc, c);
1179 ipmr_cache_free(uc);
1181 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1185 /* Close the multicast socket, and clear the vif tables etc */
1186 static void mroute_clean_tables(struct mr_table *mrt, bool all)
1190 struct mfc_cache *c, *next;
1192 /* Shut down all active vif entries */
1193 for (i = 0; i < mrt->maxvif; i++) {
1194 if (!all && (mrt->vif_table[i].flags & VIFF_STATIC))
1196 vif_delete(mrt, i, 0, &list);
1198 unregister_netdevice_many(&list);
1200 /* Wipe the cache */
1201 for (i = 0; i < MFC_LINES; i++) {
1202 list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) {
1203 if (!all && (c->mfc_flags & MFC_STATIC))
1205 list_del_rcu(&c->list);
1206 mroute_netlink_event(mrt, c, RTM_DELROUTE);
1211 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1212 spin_lock_bh(&mfc_unres_lock);
1213 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
1215 mroute_netlink_event(mrt, c, RTM_DELROUTE);
1216 ipmr_destroy_unres(mrt, c);
1218 spin_unlock_bh(&mfc_unres_lock);
1222 /* called from ip_ra_control(), before an RCU grace period,
1223 * we dont need to call synchronize_rcu() here
1225 static void mrtsock_destruct(struct sock *sk)
1227 struct net *net = sock_net(sk);
1228 struct mr_table *mrt;
1231 ipmr_for_each_table(mrt, net) {
1232 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1233 IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
1234 inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
1235 NETCONFA_IFINDEX_ALL,
1236 net->ipv4.devconf_all);
1237 RCU_INIT_POINTER(mrt->mroute_sk, NULL);
1238 mroute_clean_tables(mrt, false);
1244 /* Socket options and virtual interface manipulation. The whole
1245 * virtual interface system is a complete heap, but unfortunately
1246 * that's how BSD mrouted happens to think. Maybe one day with a proper
1247 * MOSPF/PIM router set up we can clean this up.
1250 int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
1251 unsigned int optlen)
1253 struct net *net = sock_net(sk);
1254 int val, ret = 0, parent = 0;
1255 struct mr_table *mrt;
1260 /* There's one exception to the lock - MRT_DONE which needs to unlock */
1262 if (sk->sk_type != SOCK_RAW ||
1263 inet_sk(sk)->inet_num != IPPROTO_IGMP) {
1268 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1273 if (optname != MRT_INIT) {
1274 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
1275 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1283 if (optlen != sizeof(int)) {
1287 if (rtnl_dereference(mrt->mroute_sk)) {
1292 ret = ip_ra_control(sk, 1, mrtsock_destruct);
1294 rcu_assign_pointer(mrt->mroute_sk, sk);
1295 IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
1296 inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
1297 NETCONFA_IFINDEX_ALL,
1298 net->ipv4.devconf_all);
1302 if (sk != rcu_access_pointer(mrt->mroute_sk)) {
1305 /* We need to unlock here because mrtsock_destruct takes
1306 * care of rtnl itself and we can't change that due to
1307 * the IP_ROUTER_ALERT setsockopt which runs without it.
1310 ret = ip_ra_control(sk, 0, NULL);
1316 if (optlen != sizeof(vif)) {
1320 if (copy_from_user(&vif, optval, sizeof(vif))) {
1324 if (vif.vifc_vifi >= MAXVIFS) {
1328 if (optname == MRT_ADD_VIF) {
1329 ret = vif_add(net, mrt, &vif,
1330 sk == rtnl_dereference(mrt->mroute_sk));
1332 ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
1335 /* Manipulate the forwarding caches. These live
1336 * in a sort of kernel/user symbiosis.
1341 case MRT_ADD_MFC_PROXY:
1342 case MRT_DEL_MFC_PROXY:
1343 if (optlen != sizeof(mfc)) {
1347 if (copy_from_user(&mfc, optval, sizeof(mfc))) {
1352 parent = mfc.mfcc_parent;
1353 if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
1354 ret = ipmr_mfc_delete(mrt, &mfc, parent);
1356 ret = ipmr_mfc_add(net, mrt, &mfc,
1357 sk == rtnl_dereference(mrt->mroute_sk),
1360 /* Control PIM assert. */
1362 if (optlen != sizeof(val)) {
1366 if (get_user(val, (int __user *)optval)) {
1370 mrt->mroute_do_assert = val;
1373 if (!ipmr_pimsm_enabled()) {
1377 if (optlen != sizeof(val)) {
1381 if (get_user(val, (int __user *)optval)) {
1387 if (val != mrt->mroute_do_pim) {
1388 mrt->mroute_do_pim = val;
1389 mrt->mroute_do_assert = val;
1393 if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) {
1397 if (optlen != sizeof(uval)) {
1401 if (get_user(uval, (u32 __user *)optval)) {
1406 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1409 mrt = ipmr_new_table(net, uval);
1413 raw_sk(sk)->ipmr_table = uval;
1416 /* Spurious command, or MRT_VERSION which you cannot set. */
1426 /* Getsock opt support for the multicast routing system. */
1427 int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen)
1431 struct net *net = sock_net(sk);
1432 struct mr_table *mrt;
1434 if (sk->sk_type != SOCK_RAW ||
1435 inet_sk(sk)->inet_num != IPPROTO_IGMP)
1438 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1447 if (!ipmr_pimsm_enabled())
1448 return -ENOPROTOOPT;
1449 val = mrt->mroute_do_pim;
1452 val = mrt->mroute_do_assert;
1455 return -ENOPROTOOPT;
1458 if (get_user(olr, optlen))
1460 olr = min_t(unsigned int, olr, sizeof(int));
1463 if (put_user(olr, optlen))
1465 if (copy_to_user(optval, &val, olr))
1470 /* The IP multicast ioctl support routines. */
1471 int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
1473 struct sioc_sg_req sr;
1474 struct sioc_vif_req vr;
1475 struct vif_device *vif;
1476 struct mfc_cache *c;
1477 struct net *net = sock_net(sk);
1478 struct mr_table *mrt;
1480 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1486 if (copy_from_user(&vr, arg, sizeof(vr)))
1488 if (vr.vifi >= mrt->maxvif)
1490 read_lock(&mrt_lock);
1491 vif = &mrt->vif_table[vr.vifi];
1492 if (VIF_EXISTS(mrt, vr.vifi)) {
1493 vr.icount = vif->pkt_in;
1494 vr.ocount = vif->pkt_out;
1495 vr.ibytes = vif->bytes_in;
1496 vr.obytes = vif->bytes_out;
1497 read_unlock(&mrt_lock);
1499 if (copy_to_user(arg, &vr, sizeof(vr)))
1503 read_unlock(&mrt_lock);
1504 return -EADDRNOTAVAIL;
1506 if (copy_from_user(&sr, arg, sizeof(sr)))
1510 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1512 sr.pktcnt = c->mfc_un.res.pkt;
1513 sr.bytecnt = c->mfc_un.res.bytes;
1514 sr.wrong_if = c->mfc_un.res.wrong_if;
1517 if (copy_to_user(arg, &sr, sizeof(sr)))
1522 return -EADDRNOTAVAIL;
1524 return -ENOIOCTLCMD;
1528 #ifdef CONFIG_COMPAT
1529 struct compat_sioc_sg_req {
1532 compat_ulong_t pktcnt;
1533 compat_ulong_t bytecnt;
1534 compat_ulong_t wrong_if;
1537 struct compat_sioc_vif_req {
1538 vifi_t vifi; /* Which iface */
1539 compat_ulong_t icount;
1540 compat_ulong_t ocount;
1541 compat_ulong_t ibytes;
1542 compat_ulong_t obytes;
1545 int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1547 struct compat_sioc_sg_req sr;
1548 struct compat_sioc_vif_req vr;
1549 struct vif_device *vif;
1550 struct mfc_cache *c;
1551 struct net *net = sock_net(sk);
1552 struct mr_table *mrt;
1554 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1560 if (copy_from_user(&vr, arg, sizeof(vr)))
1562 if (vr.vifi >= mrt->maxvif)
1564 read_lock(&mrt_lock);
1565 vif = &mrt->vif_table[vr.vifi];
1566 if (VIF_EXISTS(mrt, vr.vifi)) {
1567 vr.icount = vif->pkt_in;
1568 vr.ocount = vif->pkt_out;
1569 vr.ibytes = vif->bytes_in;
1570 vr.obytes = vif->bytes_out;
1571 read_unlock(&mrt_lock);
1573 if (copy_to_user(arg, &vr, sizeof(vr)))
1577 read_unlock(&mrt_lock);
1578 return -EADDRNOTAVAIL;
1580 if (copy_from_user(&sr, arg, sizeof(sr)))
1584 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1586 sr.pktcnt = c->mfc_un.res.pkt;
1587 sr.bytecnt = c->mfc_un.res.bytes;
1588 sr.wrong_if = c->mfc_un.res.wrong_if;
1591 if (copy_to_user(arg, &sr, sizeof(sr)))
1596 return -EADDRNOTAVAIL;
1598 return -ENOIOCTLCMD;
1603 static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
1605 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1606 struct net *net = dev_net(dev);
1607 struct mr_table *mrt;
1608 struct vif_device *v;
1611 if (event != NETDEV_UNREGISTER)
1614 ipmr_for_each_table(mrt, net) {
1615 v = &mrt->vif_table[0];
1616 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1618 vif_delete(mrt, ct, 1, NULL);
1624 static struct notifier_block ip_mr_notifier = {
1625 .notifier_call = ipmr_device_event,
1628 /* Encapsulate a packet by attaching a valid IPIP header to it.
1629 * This avoids tunnel drivers and other mess and gives us the speed so
1630 * important for multicast video.
1632 static void ip_encap(struct net *net, struct sk_buff *skb,
1633 __be32 saddr, __be32 daddr)
1636 const struct iphdr *old_iph = ip_hdr(skb);
1638 skb_push(skb, sizeof(struct iphdr));
1639 skb->transport_header = skb->network_header;
1640 skb_reset_network_header(skb);
1644 iph->tos = old_iph->tos;
1645 iph->ttl = old_iph->ttl;
1649 iph->protocol = IPPROTO_IPIP;
1651 iph->tot_len = htons(skb->len);
1652 ip_select_ident(net, skb, NULL);
1655 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1659 static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
1660 struct sk_buff *skb)
1662 struct ip_options *opt = &(IPCB(skb)->opt);
1664 IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS);
1665 IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len);
1667 if (unlikely(opt->optlen))
1668 ip_forward_options(skb);
1670 return dst_output(net, sk, skb);
1673 /* Processing handlers for ipmr_forward */
1675 static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
1676 struct sk_buff *skb, struct mfc_cache *c, int vifi)
1678 const struct iphdr *iph = ip_hdr(skb);
1679 struct vif_device *vif = &mrt->vif_table[vifi];
1680 struct net_device *dev;
1688 if (vif->flags & VIFF_REGISTER) {
1690 vif->bytes_out += skb->len;
1691 vif->dev->stats.tx_bytes += skb->len;
1692 vif->dev->stats.tx_packets++;
1693 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
1697 if (vif->flags & VIFF_TUNNEL) {
1698 rt = ip_route_output_ports(net, &fl4, NULL,
1699 vif->remote, vif->local,
1702 RT_TOS(iph->tos), vif->link);
1705 encap = sizeof(struct iphdr);
1707 rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
1710 RT_TOS(iph->tos), vif->link);
1717 if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
1718 /* Do not fragment multicasts. Alas, IPv4 does not
1719 * allow to send ICMP, so that packets will disappear
1722 IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS);
1727 encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
1729 if (skb_cow(skb, encap)) {
1735 vif->bytes_out += skb->len;
1738 skb_dst_set(skb, &rt->dst);
1739 ip_decrease_ttl(ip_hdr(skb));
1741 /* FIXME: forward and output firewalls used to be called here.
1742 * What do we do with netfilter? -- RR
1744 if (vif->flags & VIFF_TUNNEL) {
1745 ip_encap(net, skb, vif->local, vif->remote);
1746 /* FIXME: extra output firewall step used to be here. --RR */
1747 vif->dev->stats.tx_packets++;
1748 vif->dev->stats.tx_bytes += skb->len;
1751 IPCB(skb)->flags |= IPSKB_FORWARDED;
1753 /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1754 * not only before forwarding, but after forwarding on all output
1755 * interfaces. It is clear, if mrouter runs a multicasting
1756 * program, it should receive packets not depending to what interface
1757 * program is joined.
1758 * If we will not make it, the program will have to join on all
1759 * interfaces. On the other hand, multihoming host (or router, but
1760 * not mrouter) cannot join to more than one interface - it will
1761 * result in receiving multiple packets.
1763 NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,
1764 net, NULL, skb, skb->dev, dev,
1765 ipmr_forward_finish);
1772 static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev)
1776 for (ct = mrt->maxvif-1; ct >= 0; ct--) {
1777 if (mrt->vif_table[ct].dev == dev)
1783 /* "local" means that we should preserve one skb (for local delivery) */
1784 static void ip_mr_forward(struct net *net, struct mr_table *mrt,
1785 struct sk_buff *skb, struct mfc_cache *cache,
1790 int true_vifi = ipmr_find_vif(mrt, skb->dev);
1792 vif = cache->mfc_parent;
1793 cache->mfc_un.res.pkt++;
1794 cache->mfc_un.res.bytes += skb->len;
1796 if (cache->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
1797 struct mfc_cache *cache_proxy;
1799 /* For an (*,G) entry, we only check that the incomming
1800 * interface is part of the static tree.
1802 cache_proxy = ipmr_cache_find_any_parent(mrt, vif);
1804 cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
1808 /* Wrong interface: drop packet and (maybe) send PIM assert. */
1809 if (mrt->vif_table[vif].dev != skb->dev) {
1810 if (rt_is_output_route(skb_rtable(skb))) {
1811 /* It is our own packet, looped back.
1812 * Very complicated situation...
1814 * The best workaround until routing daemons will be
1815 * fixed is not to redistribute packet, if it was
1816 * send through wrong interface. It means, that
1817 * multicast applications WILL NOT work for
1818 * (S,G), which have default multicast route pointing
1819 * to wrong oif. In any case, it is not a good
1820 * idea to use multicasting applications on router.
1825 cache->mfc_un.res.wrong_if++;
1827 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1828 /* pimsm uses asserts, when switching from RPT to SPT,
1829 * so that we cannot check that packet arrived on an oif.
1830 * It is bad, but otherwise we would need to move pretty
1831 * large chunk of pimd to kernel. Ough... --ANK
1833 (mrt->mroute_do_pim ||
1834 cache->mfc_un.res.ttls[true_vifi] < 255) &&
1836 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
1837 cache->mfc_un.res.last_assert = jiffies;
1838 ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
1844 mrt->vif_table[vif].pkt_in++;
1845 mrt->vif_table[vif].bytes_in += skb->len;
1847 /* Forward the frame */
1848 if (cache->mfc_origin == htonl(INADDR_ANY) &&
1849 cache->mfc_mcastgrp == htonl(INADDR_ANY)) {
1850 if (true_vifi >= 0 &&
1851 true_vifi != cache->mfc_parent &&
1853 cache->mfc_un.res.ttls[cache->mfc_parent]) {
1854 /* It's an (*,*) entry and the packet is not coming from
1855 * the upstream: forward the packet to the upstream
1858 psend = cache->mfc_parent;
1863 for (ct = cache->mfc_un.res.maxvif - 1;
1864 ct >= cache->mfc_un.res.minvif; ct--) {
1865 /* For (*,G) entry, don't forward to the incoming interface */
1866 if ((cache->mfc_origin != htonl(INADDR_ANY) ||
1868 ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
1870 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1873 ipmr_queue_xmit(net, mrt, skb2, cache,
1882 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1885 ipmr_queue_xmit(net, mrt, skb2, cache, psend);
1887 ipmr_queue_xmit(net, mrt, skb, cache, psend);
1897 static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
1899 struct rtable *rt = skb_rtable(skb);
1900 struct iphdr *iph = ip_hdr(skb);
1901 struct flowi4 fl4 = {
1902 .daddr = iph->daddr,
1903 .saddr = iph->saddr,
1904 .flowi4_tos = RT_TOS(iph->tos),
1905 .flowi4_oif = (rt_is_output_route(rt) ?
1906 skb->dev->ifindex : 0),
1907 .flowi4_iif = (rt_is_output_route(rt) ?
1910 .flowi4_mark = skb->mark,
1912 struct mr_table *mrt;
1915 err = ipmr_fib_lookup(net, &fl4, &mrt);
1917 return ERR_PTR(err);
1921 /* Multicast packets for forwarding arrive here
1922 * Called with rcu_read_lock();
1924 int ip_mr_input(struct sk_buff *skb)
1926 struct mfc_cache *cache;
1927 struct net *net = dev_net(skb->dev);
1928 int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
1929 struct mr_table *mrt;
1931 /* Packet is looped back after forward, it should not be
1932 * forwarded second time, but still can be delivered locally.
1934 if (IPCB(skb)->flags & IPSKB_FORWARDED)
1937 mrt = ipmr_rt_fib_lookup(net, skb);
1940 return PTR_ERR(mrt);
1943 if (IPCB(skb)->opt.router_alert) {
1944 if (ip_call_ra_chain(skb))
1946 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
1947 /* IGMPv1 (and broken IGMPv2 implementations sort of
1948 * Cisco IOS <= 11.2(8)) do not put router alert
1949 * option to IGMP packets destined to routable
1950 * groups. It is very bad, because it means
1951 * that we can forward NO IGMP messages.
1953 struct sock *mroute_sk;
1955 mroute_sk = rcu_dereference(mrt->mroute_sk);
1958 raw_rcv(mroute_sk, skb);
1964 /* already under rcu_read_lock() */
1965 cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
1967 int vif = ipmr_find_vif(mrt, skb->dev);
1970 cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,
1974 /* No usable cache entry */
1979 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1980 ip_local_deliver(skb);
1986 read_lock(&mrt_lock);
1987 vif = ipmr_find_vif(mrt, skb->dev);
1989 int err2 = ipmr_cache_unresolved(mrt, vif, skb);
1990 read_unlock(&mrt_lock);
1994 read_unlock(&mrt_lock);
1999 read_lock(&mrt_lock);
2000 ip_mr_forward(net, mrt, skb, cache, local);
2001 read_unlock(&mrt_lock);
2004 return ip_local_deliver(skb);
2010 return ip_local_deliver(skb);
2015 #ifdef CONFIG_IP_PIMSM_V1
2016 /* Handle IGMP messages of PIMv1 */
2017 int pim_rcv_v1(struct sk_buff *skb)
2019 struct igmphdr *pim;
2020 struct net *net = dev_net(skb->dev);
2021 struct mr_table *mrt;
2023 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2026 pim = igmp_hdr(skb);
2028 mrt = ipmr_rt_fib_lookup(net, skb);
2031 if (!mrt->mroute_do_pim ||
2032 pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
2035 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2043 #ifdef CONFIG_IP_PIMSM_V2
2044 static int pim_rcv(struct sk_buff *skb)
2046 struct pimreghdr *pim;
2047 struct net *net = dev_net(skb->dev);
2048 struct mr_table *mrt;
2050 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2053 pim = (struct pimreghdr *)skb_transport_header(skb);
2054 if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) ||
2055 (pim->flags & PIM_NULL_REGISTER) ||
2056 (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
2057 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
2060 mrt = ipmr_rt_fib_lookup(net, skb);
2063 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2071 static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2072 struct mfc_cache *c, struct rtmsg *rtm)
2075 struct rtnexthop *nhp;
2076 struct nlattr *mp_attr;
2077 struct rta_mfc_stats mfcs;
2079 /* If cache is unresolved, don't try to parse IIF and OIF */
2080 if (c->mfc_parent >= MAXVIFS)
2083 if (VIF_EXISTS(mrt, c->mfc_parent) &&
2084 nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0)
2087 if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH)))
2090 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2091 if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2092 if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) {
2093 nla_nest_cancel(skb, mp_attr);
2097 nhp->rtnh_flags = 0;
2098 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2099 nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex;
2100 nhp->rtnh_len = sizeof(*nhp);
2104 nla_nest_end(skb, mp_attr);
2106 mfcs.mfcs_packets = c->mfc_un.res.pkt;
2107 mfcs.mfcs_bytes = c->mfc_un.res.bytes;
2108 mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
2109 if (nla_put_64bit(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs, RTA_PAD) < 0)
2112 rtm->rtm_type = RTN_MULTICAST;
2116 int ipmr_get_route(struct net *net, struct sk_buff *skb,
2117 __be32 saddr, __be32 daddr,
2118 struct rtmsg *rtm, int nowait)
2120 struct mfc_cache *cache;
2121 struct mr_table *mrt;
2124 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2129 cache = ipmr_cache_find(mrt, saddr, daddr);
2130 if (!cache && skb->dev) {
2131 int vif = ipmr_find_vif(mrt, skb->dev);
2134 cache = ipmr_cache_find_any(mrt, daddr, vif);
2137 struct sk_buff *skb2;
2139 struct net_device *dev;
2148 read_lock(&mrt_lock);
2150 vif = ipmr_find_vif(mrt, dev);
2152 read_unlock(&mrt_lock);
2156 skb2 = skb_clone(skb, GFP_ATOMIC);
2158 read_unlock(&mrt_lock);
2163 skb_push(skb2, sizeof(struct iphdr));
2164 skb_reset_network_header(skb2);
2166 iph->ihl = sizeof(struct iphdr) >> 2;
2170 err = ipmr_cache_unresolved(mrt, vif, skb2);
2171 read_unlock(&mrt_lock);
2176 read_lock(&mrt_lock);
2177 err = __ipmr_fill_mroute(mrt, skb, cache, rtm);
2178 read_unlock(&mrt_lock);
2183 static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2184 u32 portid, u32 seq, struct mfc_cache *c, int cmd,
2187 struct nlmsghdr *nlh;
2191 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2195 rtm = nlmsg_data(nlh);
2196 rtm->rtm_family = RTNL_FAMILY_IPMR;
2197 rtm->rtm_dst_len = 32;
2198 rtm->rtm_src_len = 32;
2200 rtm->rtm_table = mrt->id;
2201 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2202 goto nla_put_failure;
2203 rtm->rtm_type = RTN_MULTICAST;
2204 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2205 if (c->mfc_flags & MFC_STATIC)
2206 rtm->rtm_protocol = RTPROT_STATIC;
2208 rtm->rtm_protocol = RTPROT_MROUTED;
2211 if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) ||
2212 nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp))
2213 goto nla_put_failure;
2214 err = __ipmr_fill_mroute(mrt, skb, c, rtm);
2215 /* do not break the dump if cache is unresolved */
2216 if (err < 0 && err != -ENOENT)
2217 goto nla_put_failure;
2219 nlmsg_end(skb, nlh);
2223 nlmsg_cancel(skb, nlh);
2227 static size_t mroute_msgsize(bool unresolved, int maxvif)
2230 NLMSG_ALIGN(sizeof(struct rtmsg))
2231 + nla_total_size(4) /* RTA_TABLE */
2232 + nla_total_size(4) /* RTA_SRC */
2233 + nla_total_size(4) /* RTA_DST */
2238 + nla_total_size(4) /* RTA_IIF */
2239 + nla_total_size(0) /* RTA_MULTIPATH */
2240 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2242 + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
2248 static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
2251 struct net *net = read_pnet(&mrt->net);
2252 struct sk_buff *skb;
2255 skb = nlmsg_new(mroute_msgsize(mfc->mfc_parent >= MAXVIFS, mrt->maxvif),
2260 err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2264 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC);
2270 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err);
2273 static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2275 struct net *net = sock_net(skb->sk);
2276 struct mr_table *mrt;
2277 struct mfc_cache *mfc;
2278 unsigned int t = 0, s_t;
2279 unsigned int h = 0, s_h;
2280 unsigned int e = 0, s_e;
2287 ipmr_for_each_table(mrt, net) {
2292 for (h = s_h; h < MFC_LINES; h++) {
2293 list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) {
2296 if (ipmr_fill_mroute(mrt, skb,
2297 NETLINK_CB(cb->skb).portid,
2307 spin_lock_bh(&mfc_unres_lock);
2308 list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) {
2311 if (ipmr_fill_mroute(mrt, skb,
2312 NETLINK_CB(cb->skb).portid,
2316 spin_unlock_bh(&mfc_unres_lock);
2322 spin_unlock_bh(&mfc_unres_lock);
2338 static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = {
2339 [RTA_SRC] = { .type = NLA_U32 },
2340 [RTA_DST] = { .type = NLA_U32 },
2341 [RTA_IIF] = { .type = NLA_U32 },
2342 [RTA_TABLE] = { .type = NLA_U32 },
2343 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2346 static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol)
2348 switch (rtm_protocol) {
2350 case RTPROT_MROUTED:
2356 static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc)
2358 struct rtnexthop *rtnh = nla_data(nla);
2359 int remaining = nla_len(nla), vifi = 0;
2361 while (rtnh_ok(rtnh, remaining)) {
2362 mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops;
2363 if (++vifi == MAXVIFS)
2365 rtnh = rtnh_next(rtnh, &remaining);
2368 return remaining > 0 ? -EINVAL : vifi;
2371 /* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */
2372 static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh,
2373 struct mfcctl *mfcc, int *mrtsock,
2374 struct mr_table **mrtret)
2376 struct net_device *dev = NULL;
2377 u32 tblid = RT_TABLE_DEFAULT;
2378 struct mr_table *mrt;
2379 struct nlattr *attr;
2383 ret = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipmr_policy);
2386 rtm = nlmsg_data(nlh);
2389 if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 ||
2390 rtm->rtm_type != RTN_MULTICAST ||
2391 rtm->rtm_scope != RT_SCOPE_UNIVERSE ||
2392 !ipmr_rtm_validate_proto(rtm->rtm_protocol))
2395 memset(mfcc, 0, sizeof(*mfcc));
2396 mfcc->mfcc_parent = -1;
2398 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) {
2399 switch (nla_type(attr)) {
2401 mfcc->mfcc_origin.s_addr = nla_get_be32(attr);
2404 mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr);
2407 dev = __dev_get_by_index(net, nla_get_u32(attr));
2414 if (ipmr_nla_get_ttls(attr, mfcc) < 0) {
2423 tblid = nla_get_u32(attr);
2427 mrt = ipmr_get_table(net, tblid);
2433 *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0;
2435 mfcc->mfcc_parent = ipmr_find_vif(mrt, dev);
2441 /* takes care of both newroute and delroute */
2442 static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh)
2444 struct net *net = sock_net(skb->sk);
2445 int ret, mrtsock, parent;
2446 struct mr_table *tbl;
2451 ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl);
2455 parent = ret ? mfcc.mfcc_parent : -1;
2456 if (nlh->nlmsg_type == RTM_NEWROUTE)
2457 return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent);
2459 return ipmr_mfc_delete(tbl, &mfcc, parent);
2462 #ifdef CONFIG_PROC_FS
2463 /* The /proc interfaces to multicast routing :
2464 * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
2466 struct ipmr_vif_iter {
2467 struct seq_net_private p;
2468 struct mr_table *mrt;
2472 static struct vif_device *ipmr_vif_seq_idx(struct net *net,
2473 struct ipmr_vif_iter *iter,
2476 struct mr_table *mrt = iter->mrt;
2478 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
2479 if (!VIF_EXISTS(mrt, iter->ct))
2482 return &mrt->vif_table[iter->ct];
2487 static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
2488 __acquires(mrt_lock)
2490 struct ipmr_vif_iter *iter = seq->private;
2491 struct net *net = seq_file_net(seq);
2492 struct mr_table *mrt;
2494 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2496 return ERR_PTR(-ENOENT);
2500 read_lock(&mrt_lock);
2501 return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1)
2505 static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2507 struct ipmr_vif_iter *iter = seq->private;
2508 struct net *net = seq_file_net(seq);
2509 struct mr_table *mrt = iter->mrt;
2512 if (v == SEQ_START_TOKEN)
2513 return ipmr_vif_seq_idx(net, iter, 0);
2515 while (++iter->ct < mrt->maxvif) {
2516 if (!VIF_EXISTS(mrt, iter->ct))
2518 return &mrt->vif_table[iter->ct];
2523 static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
2524 __releases(mrt_lock)
2526 read_unlock(&mrt_lock);
2529 static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
2531 struct ipmr_vif_iter *iter = seq->private;
2532 struct mr_table *mrt = iter->mrt;
2534 if (v == SEQ_START_TOKEN) {
2536 "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n");
2538 const struct vif_device *vif = v;
2539 const char *name = vif->dev ? vif->dev->name : "none";
2542 "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n",
2543 vif - mrt->vif_table,
2544 name, vif->bytes_in, vif->pkt_in,
2545 vif->bytes_out, vif->pkt_out,
2546 vif->flags, vif->local, vif->remote);
2551 static const struct seq_operations ipmr_vif_seq_ops = {
2552 .start = ipmr_vif_seq_start,
2553 .next = ipmr_vif_seq_next,
2554 .stop = ipmr_vif_seq_stop,
2555 .show = ipmr_vif_seq_show,
2558 static int ipmr_vif_open(struct inode *inode, struct file *file)
2560 return seq_open_net(inode, file, &ipmr_vif_seq_ops,
2561 sizeof(struct ipmr_vif_iter));
2564 static const struct file_operations ipmr_vif_fops = {
2565 .owner = THIS_MODULE,
2566 .open = ipmr_vif_open,
2568 .llseek = seq_lseek,
2569 .release = seq_release_net,
2572 struct ipmr_mfc_iter {
2573 struct seq_net_private p;
2574 struct mr_table *mrt;
2575 struct list_head *cache;
2580 static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net,
2581 struct ipmr_mfc_iter *it, loff_t pos)
2583 struct mr_table *mrt = it->mrt;
2584 struct mfc_cache *mfc;
2587 for (it->ct = 0; it->ct < MFC_LINES; it->ct++) {
2588 it->cache = &mrt->mfc_cache_array[it->ct];
2589 list_for_each_entry_rcu(mfc, it->cache, list)
2595 spin_lock_bh(&mfc_unres_lock);
2596 it->cache = &mrt->mfc_unres_queue;
2597 list_for_each_entry(mfc, it->cache, list)
2600 spin_unlock_bh(&mfc_unres_lock);
2607 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
2609 struct ipmr_mfc_iter *it = seq->private;
2610 struct net *net = seq_file_net(seq);
2611 struct mr_table *mrt;
2613 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2615 return ERR_PTR(-ENOENT);
2620 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
2624 static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2626 struct mfc_cache *mfc = v;
2627 struct ipmr_mfc_iter *it = seq->private;
2628 struct net *net = seq_file_net(seq);
2629 struct mr_table *mrt = it->mrt;
2633 if (v == SEQ_START_TOKEN)
2634 return ipmr_mfc_seq_idx(net, seq->private, 0);
2636 if (mfc->list.next != it->cache)
2637 return list_entry(mfc->list.next, struct mfc_cache, list);
2639 if (it->cache == &mrt->mfc_unres_queue)
2642 BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]);
2644 while (++it->ct < MFC_LINES) {
2645 it->cache = &mrt->mfc_cache_array[it->ct];
2646 if (list_empty(it->cache))
2648 return list_first_entry(it->cache, struct mfc_cache, list);
2651 /* exhausted cache_array, show unresolved */
2653 it->cache = &mrt->mfc_unres_queue;
2656 spin_lock_bh(&mfc_unres_lock);
2657 if (!list_empty(it->cache))
2658 return list_first_entry(it->cache, struct mfc_cache, list);
2661 spin_unlock_bh(&mfc_unres_lock);
2667 static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
2669 struct ipmr_mfc_iter *it = seq->private;
2670 struct mr_table *mrt = it->mrt;
2672 if (it->cache == &mrt->mfc_unres_queue)
2673 spin_unlock_bh(&mfc_unres_lock);
2674 else if (it->cache == &mrt->mfc_cache_array[it->ct])
2678 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
2682 if (v == SEQ_START_TOKEN) {
2684 "Group Origin Iif Pkts Bytes Wrong Oifs\n");
2686 const struct mfc_cache *mfc = v;
2687 const struct ipmr_mfc_iter *it = seq->private;
2688 const struct mr_table *mrt = it->mrt;
2690 seq_printf(seq, "%08X %08X %-3hd",
2691 (__force u32) mfc->mfc_mcastgrp,
2692 (__force u32) mfc->mfc_origin,
2695 if (it->cache != &mrt->mfc_unres_queue) {
2696 seq_printf(seq, " %8lu %8lu %8lu",
2697 mfc->mfc_un.res.pkt,
2698 mfc->mfc_un.res.bytes,
2699 mfc->mfc_un.res.wrong_if);
2700 for (n = mfc->mfc_un.res.minvif;
2701 n < mfc->mfc_un.res.maxvif; n++) {
2702 if (VIF_EXISTS(mrt, n) &&
2703 mfc->mfc_un.res.ttls[n] < 255)
2706 n, mfc->mfc_un.res.ttls[n]);
2709 /* unresolved mfc_caches don't contain
2710 * pkt, bytes and wrong_if values
2712 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
2714 seq_putc(seq, '\n');
2719 static const struct seq_operations ipmr_mfc_seq_ops = {
2720 .start = ipmr_mfc_seq_start,
2721 .next = ipmr_mfc_seq_next,
2722 .stop = ipmr_mfc_seq_stop,
2723 .show = ipmr_mfc_seq_show,
2726 static int ipmr_mfc_open(struct inode *inode, struct file *file)
2728 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
2729 sizeof(struct ipmr_mfc_iter));
2732 static const struct file_operations ipmr_mfc_fops = {
2733 .owner = THIS_MODULE,
2734 .open = ipmr_mfc_open,
2736 .llseek = seq_lseek,
2737 .release = seq_release_net,
2741 #ifdef CONFIG_IP_PIMSM_V2
2742 static const struct net_protocol pim_protocol = {
2748 /* Setup for IP multicast routing */
2749 static int __net_init ipmr_net_init(struct net *net)
2753 err = ipmr_rules_init(net);
2757 #ifdef CONFIG_PROC_FS
2759 if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops))
2761 if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops))
2762 goto proc_cache_fail;
2766 #ifdef CONFIG_PROC_FS
2768 remove_proc_entry("ip_mr_vif", net->proc_net);
2770 ipmr_rules_exit(net);
2776 static void __net_exit ipmr_net_exit(struct net *net)
2778 #ifdef CONFIG_PROC_FS
2779 remove_proc_entry("ip_mr_cache", net->proc_net);
2780 remove_proc_entry("ip_mr_vif", net->proc_net);
2782 ipmr_rules_exit(net);
2785 static struct pernet_operations ipmr_net_ops = {
2786 .init = ipmr_net_init,
2787 .exit = ipmr_net_exit,
2790 int __init ip_mr_init(void)
2794 mrt_cachep = kmem_cache_create("ip_mrt_cache",
2795 sizeof(struct mfc_cache),
2796 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
2799 err = register_pernet_subsys(&ipmr_net_ops);
2801 goto reg_pernet_fail;
2803 err = register_netdevice_notifier(&ip_mr_notifier);
2805 goto reg_notif_fail;
2806 #ifdef CONFIG_IP_PIMSM_V2
2807 if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
2808 pr_err("%s: can't add PIM protocol\n", __func__);
2810 goto add_proto_fail;
2813 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
2814 NULL, ipmr_rtm_dumproute, NULL);
2815 rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE,
2816 ipmr_rtm_route, NULL, NULL);
2817 rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE,
2818 ipmr_rtm_route, NULL, NULL);
2821 #ifdef CONFIG_IP_PIMSM_V2
2823 unregister_netdevice_notifier(&ip_mr_notifier);
2826 unregister_pernet_subsys(&ipmr_net_ops);
2828 kmem_cache_destroy(mrt_cachep);