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 <linux/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>
71 #include <linux/nospec.h>
74 struct fib_rule common;
81 /* Big lock, protecting vif table, mrt cache and mroute socket state.
82 * Note that the changes are semaphored via rtnl_lock.
85 static DEFINE_RWLOCK(mrt_lock);
87 /* Multicast router control variables */
89 /* Special spinlock for queue of unresolved entries */
90 static DEFINE_SPINLOCK(mfc_unres_lock);
92 /* We return to original Alan's scheme. Hash table of resolved
93 * entries is changed only in process context and protected
94 * with weak lock mrt_lock. Queue of unresolved entries is protected
95 * with strong spinlock mfc_unres_lock.
97 * In this case data path is free of exclusive locks at all.
100 static struct kmem_cache *mrt_cachep __read_mostly;
102 static struct mr_table *ipmr_new_table(struct net *net, u32 id);
103 static void ipmr_free_table(struct mr_table *mrt);
105 static void ip_mr_forward(struct net *net, struct mr_table *mrt,
106 struct net_device *dev, struct sk_buff *skb,
107 struct mfc_cache *cache, int local);
108 static int ipmr_cache_report(struct mr_table *mrt,
109 struct sk_buff *pkt, vifi_t vifi, int assert);
110 static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
111 struct mfc_cache *c, struct rtmsg *rtm);
112 static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
114 static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt);
115 static void mroute_clean_tables(struct mr_table *mrt, bool all);
116 static void ipmr_expire_process(unsigned long arg);
118 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
119 #define ipmr_for_each_table(mrt, net) \
120 list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list)
122 static struct mr_table *ipmr_get_table(struct net *net, u32 id)
124 struct mr_table *mrt;
126 ipmr_for_each_table(mrt, net) {
133 static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
134 struct mr_table **mrt)
137 struct ipmr_result res;
138 struct fib_lookup_arg arg = {
140 .flags = FIB_LOOKUP_NOREF,
143 /* update flow if oif or iif point to device enslaved to l3mdev */
144 l3mdev_update_flow(net, flowi4_to_flowi(flp4));
146 err = fib_rules_lookup(net->ipv4.mr_rules_ops,
147 flowi4_to_flowi(flp4), 0, &arg);
154 static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp,
155 int flags, struct fib_lookup_arg *arg)
157 struct ipmr_result *res = arg->result;
158 struct mr_table *mrt;
160 switch (rule->action) {
163 case FR_ACT_UNREACHABLE:
165 case FR_ACT_PROHIBIT:
167 case FR_ACT_BLACKHOLE:
172 arg->table = fib_rule_get_table(rule, arg);
174 mrt = ipmr_get_table(rule->fr_net, arg->table);
181 static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
186 static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = {
190 static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
191 struct fib_rule_hdr *frh, struct nlattr **tb)
196 static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
202 static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
203 struct fib_rule_hdr *frh)
211 static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = {
212 .family = RTNL_FAMILY_IPMR,
213 .rule_size = sizeof(struct ipmr_rule),
214 .addr_size = sizeof(u32),
215 .action = ipmr_rule_action,
216 .match = ipmr_rule_match,
217 .configure = ipmr_rule_configure,
218 .compare = ipmr_rule_compare,
219 .fill = ipmr_rule_fill,
220 .nlgroup = RTNLGRP_IPV4_RULE,
221 .policy = ipmr_rule_policy,
222 .owner = THIS_MODULE,
225 static int __net_init ipmr_rules_init(struct net *net)
227 struct fib_rules_ops *ops;
228 struct mr_table *mrt;
231 ops = fib_rules_register(&ipmr_rules_ops_template, net);
235 INIT_LIST_HEAD(&net->ipv4.mr_tables);
237 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
243 err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0);
247 net->ipv4.mr_rules_ops = ops;
251 ipmr_free_table(mrt);
253 fib_rules_unregister(ops);
257 static void __net_exit ipmr_rules_exit(struct net *net)
259 struct mr_table *mrt, *next;
262 list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
263 list_del(&mrt->list);
264 ipmr_free_table(mrt);
266 fib_rules_unregister(net->ipv4.mr_rules_ops);
270 #define ipmr_for_each_table(mrt, net) \
271 for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
273 static struct mr_table *ipmr_get_table(struct net *net, u32 id)
275 return net->ipv4.mrt;
278 static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4,
279 struct mr_table **mrt)
281 *mrt = net->ipv4.mrt;
285 static int __net_init ipmr_rules_init(struct net *net)
287 struct mr_table *mrt;
289 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
296 static void __net_exit ipmr_rules_exit(struct net *net)
299 ipmr_free_table(net->ipv4.mrt);
300 net->ipv4.mrt = NULL;
305 static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg,
308 const struct mfc_cache_cmp_arg *cmparg = arg->key;
309 struct mfc_cache *c = (struct mfc_cache *)ptr;
311 return cmparg->mfc_mcastgrp != c->mfc_mcastgrp ||
312 cmparg->mfc_origin != c->mfc_origin;
315 static const struct rhashtable_params ipmr_rht_params = {
316 .head_offset = offsetof(struct mfc_cache, mnode),
317 .key_offset = offsetof(struct mfc_cache, cmparg),
318 .key_len = sizeof(struct mfc_cache_cmp_arg),
321 .obj_cmpfn = ipmr_hash_cmp,
322 .automatic_shrinking = true,
325 static struct mr_table *ipmr_new_table(struct net *net, u32 id)
327 struct mr_table *mrt;
330 /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */
331 if (id != RT_TABLE_DEFAULT && id >= 1000000000)
332 return ERR_PTR(-EINVAL);
334 mrt = ipmr_get_table(net, id);
338 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
340 return ERR_PTR(-ENOMEM);
341 write_pnet(&mrt->net, net);
344 err = rhltable_init(&mrt->mfc_hash, &ipmr_rht_params);
349 INIT_LIST_HEAD(&mrt->mfc_cache_list);
350 INIT_LIST_HEAD(&mrt->mfc_unres_queue);
352 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
355 mrt->mroute_reg_vif_num = -1;
356 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
357 list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
362 static void ipmr_free_table(struct mr_table *mrt)
364 del_timer_sync(&mrt->ipmr_expire_timer);
365 mroute_clean_tables(mrt, true);
366 rhltable_destroy(&mrt->mfc_hash);
370 /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
372 static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v)
374 struct net *net = dev_net(dev);
378 dev = __dev_get_by_name(net, "tunl0");
380 const struct net_device_ops *ops = dev->netdev_ops;
382 struct ip_tunnel_parm p;
384 memset(&p, 0, sizeof(p));
385 p.iph.daddr = v->vifc_rmt_addr.s_addr;
386 p.iph.saddr = v->vifc_lcl_addr.s_addr;
389 p.iph.protocol = IPPROTO_IPIP;
390 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
391 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
393 if (ops->ndo_do_ioctl) {
394 mm_segment_t oldfs = get_fs();
397 ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL);
403 /* Initialize ipmr pimreg/tunnel in_device */
404 static bool ipmr_init_vif_indev(const struct net_device *dev)
406 struct in_device *in_dev;
410 in_dev = __in_dev_get_rtnl(dev);
413 ipv4_devconf_setall(in_dev);
414 neigh_parms_data_state_setall(in_dev->arp_parms);
415 IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
420 static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
422 struct net_device *dev;
424 dev = __dev_get_by_name(net, "tunl0");
427 const struct net_device_ops *ops = dev->netdev_ops;
430 struct ip_tunnel_parm p;
432 memset(&p, 0, sizeof(p));
433 p.iph.daddr = v->vifc_rmt_addr.s_addr;
434 p.iph.saddr = v->vifc_lcl_addr.s_addr;
437 p.iph.protocol = IPPROTO_IPIP;
438 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
439 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
441 if (ops->ndo_do_ioctl) {
442 mm_segment_t oldfs = get_fs();
445 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
453 (dev = __dev_get_by_name(net, p.name)) != NULL) {
454 dev->flags |= IFF_MULTICAST;
455 if (!ipmr_init_vif_indev(dev))
465 unregister_netdevice(dev);
469 #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
470 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
472 struct net *net = dev_net(dev);
473 struct mr_table *mrt;
474 struct flowi4 fl4 = {
475 .flowi4_oif = dev->ifindex,
476 .flowi4_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
477 .flowi4_mark = skb->mark,
481 err = ipmr_fib_lookup(net, &fl4, &mrt);
487 read_lock(&mrt_lock);
488 dev->stats.tx_bytes += skb->len;
489 dev->stats.tx_packets++;
490 ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT);
491 read_unlock(&mrt_lock);
496 static int reg_vif_get_iflink(const struct net_device *dev)
501 static const struct net_device_ops reg_vif_netdev_ops = {
502 .ndo_start_xmit = reg_vif_xmit,
503 .ndo_get_iflink = reg_vif_get_iflink,
506 static void reg_vif_setup(struct net_device *dev)
508 dev->type = ARPHRD_PIMREG;
509 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
510 dev->flags = IFF_NOARP;
511 dev->netdev_ops = ®_vif_netdev_ops;
512 dev->needs_free_netdev = true;
513 dev->features |= NETIF_F_NETNS_LOCAL;
516 static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
518 struct net_device *dev;
521 if (mrt->id == RT_TABLE_DEFAULT)
522 sprintf(name, "pimreg");
524 sprintf(name, "pimreg%u", mrt->id);
526 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
531 dev_net_set(dev, net);
533 if (register_netdevice(dev)) {
538 if (!ipmr_init_vif_indev(dev))
548 unregister_netdevice(dev);
552 /* called with rcu_read_lock() */
553 static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
556 struct net_device *reg_dev = NULL;
559 encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
561 * a. packet is really sent to a multicast group
562 * b. packet is not a NULL-REGISTER
563 * c. packet is not truncated
565 if (!ipv4_is_multicast(encap->daddr) ||
566 encap->tot_len == 0 ||
567 ntohs(encap->tot_len) + pimlen > skb->len)
570 read_lock(&mrt_lock);
571 if (mrt->mroute_reg_vif_num >= 0)
572 reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev;
573 read_unlock(&mrt_lock);
578 skb->mac_header = skb->network_header;
579 skb_pull(skb, (u8 *)encap - skb->data);
580 skb_reset_network_header(skb);
581 skb->protocol = htons(ETH_P_IP);
582 skb->ip_summed = CHECKSUM_NONE;
584 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
588 return NET_RX_SUCCESS;
591 static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
598 * vif_delete - Delete a VIF entry
599 * @notify: Set to 1, if the caller is a notifier_call
601 static int vif_delete(struct mr_table *mrt, int vifi, int notify,
602 struct list_head *head)
604 struct vif_device *v;
605 struct net_device *dev;
606 struct in_device *in_dev;
608 if (vifi < 0 || vifi >= mrt->maxvif)
609 return -EADDRNOTAVAIL;
611 v = &mrt->vif_table[vifi];
613 write_lock_bh(&mrt_lock);
618 write_unlock_bh(&mrt_lock);
619 return -EADDRNOTAVAIL;
622 if (vifi == mrt->mroute_reg_vif_num)
623 mrt->mroute_reg_vif_num = -1;
625 if (vifi + 1 == mrt->maxvif) {
628 for (tmp = vifi - 1; tmp >= 0; tmp--) {
629 if (VIF_EXISTS(mrt, tmp))
635 write_unlock_bh(&mrt_lock);
637 dev_set_allmulti(dev, -1);
639 in_dev = __in_dev_get_rtnl(dev);
641 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
642 inet_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
643 NETCONFA_MC_FORWARDING,
644 dev->ifindex, &in_dev->cnf);
645 ip_rt_multicast_event(in_dev);
648 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
649 unregister_netdevice_queue(dev, head);
655 static void ipmr_cache_free_rcu(struct rcu_head *head)
657 struct mfc_cache *c = container_of(head, struct mfc_cache, rcu);
659 kmem_cache_free(mrt_cachep, c);
662 static inline void ipmr_cache_free(struct mfc_cache *c)
664 call_rcu(&c->rcu, ipmr_cache_free_rcu);
667 /* Destroy an unresolved cache entry, killing queued skbs
668 * and reporting error to netlink readers.
670 static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
672 struct net *net = read_pnet(&mrt->net);
676 atomic_dec(&mrt->cache_resolve_queue_len);
678 while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) {
679 if (ip_hdr(skb)->version == 0) {
680 struct nlmsghdr *nlh = skb_pull(skb,
681 sizeof(struct iphdr));
682 nlh->nlmsg_type = NLMSG_ERROR;
683 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
684 skb_trim(skb, nlh->nlmsg_len);
686 e->error = -ETIMEDOUT;
687 memset(&e->msg, 0, sizeof(e->msg));
689 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
698 /* Timer process for the unresolved queue. */
699 static void ipmr_expire_process(unsigned long arg)
701 struct mr_table *mrt = (struct mr_table *)arg;
703 unsigned long expires;
704 struct mfc_cache *c, *next;
706 if (!spin_trylock(&mfc_unres_lock)) {
707 mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
711 if (list_empty(&mrt->mfc_unres_queue))
717 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
718 if (time_after(c->mfc_un.unres.expires, now)) {
719 unsigned long interval = c->mfc_un.unres.expires - now;
720 if (interval < expires)
726 mroute_netlink_event(mrt, c, RTM_DELROUTE);
727 ipmr_destroy_unres(mrt, c);
730 if (!list_empty(&mrt->mfc_unres_queue))
731 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
734 spin_unlock(&mfc_unres_lock);
737 /* Fill oifs list. It is called under write locked mrt_lock. */
738 static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache,
743 cache->mfc_un.res.minvif = MAXVIFS;
744 cache->mfc_un.res.maxvif = 0;
745 memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
747 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
748 if (VIF_EXISTS(mrt, vifi) &&
749 ttls[vifi] && ttls[vifi] < 255) {
750 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
751 if (cache->mfc_un.res.minvif > vifi)
752 cache->mfc_un.res.minvif = vifi;
753 if (cache->mfc_un.res.maxvif <= vifi)
754 cache->mfc_un.res.maxvif = vifi + 1;
757 cache->mfc_un.res.lastuse = jiffies;
760 static int vif_add(struct net *net, struct mr_table *mrt,
761 struct vifctl *vifc, int mrtsock)
763 int vifi = vifc->vifc_vifi;
764 struct vif_device *v = &mrt->vif_table[vifi];
765 struct net_device *dev;
766 struct in_device *in_dev;
770 if (VIF_EXISTS(mrt, vifi))
773 switch (vifc->vifc_flags) {
775 if (!ipmr_pimsm_enabled())
777 /* Special Purpose VIF in PIM
778 * All the packets will be sent to the daemon
780 if (mrt->mroute_reg_vif_num >= 0)
782 dev = ipmr_reg_vif(net, mrt);
785 err = dev_set_allmulti(dev, 1);
787 unregister_netdevice(dev);
793 dev = ipmr_new_tunnel(net, vifc);
796 err = dev_set_allmulti(dev, 1);
798 ipmr_del_tunnel(dev, vifc);
803 case VIFF_USE_IFINDEX:
805 if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
806 dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
807 if (dev && !__in_dev_get_rtnl(dev)) {
809 return -EADDRNOTAVAIL;
812 dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
815 return -EADDRNOTAVAIL;
816 err = dev_set_allmulti(dev, 1);
826 in_dev = __in_dev_get_rtnl(dev);
829 return -EADDRNOTAVAIL;
831 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
832 inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_MC_FORWARDING,
833 dev->ifindex, &in_dev->cnf);
834 ip_rt_multicast_event(in_dev);
836 /* Fill in the VIF structures */
838 v->rate_limit = vifc->vifc_rate_limit;
839 v->local = vifc->vifc_lcl_addr.s_addr;
840 v->remote = vifc->vifc_rmt_addr.s_addr;
841 v->flags = vifc->vifc_flags;
843 v->flags |= VIFF_STATIC;
844 v->threshold = vifc->vifc_threshold;
849 v->link = dev->ifindex;
850 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER))
851 v->link = dev_get_iflink(dev);
853 /* And finish update writing critical data */
854 write_lock_bh(&mrt_lock);
856 if (v->flags & VIFF_REGISTER)
857 mrt->mroute_reg_vif_num = vifi;
858 if (vifi+1 > mrt->maxvif)
859 mrt->maxvif = vifi+1;
860 write_unlock_bh(&mrt_lock);
864 /* called with rcu_read_lock() */
865 static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
869 struct mfc_cache_cmp_arg arg = {
870 .mfc_mcastgrp = mcastgrp,
873 struct rhlist_head *tmp, *list;
876 list = rhltable_lookup(&mrt->mfc_hash, &arg, ipmr_rht_params);
877 rhl_for_each_entry_rcu(c, tmp, list, mnode)
883 /* Look for a (*,*,oif) entry */
884 static struct mfc_cache *ipmr_cache_find_any_parent(struct mr_table *mrt,
887 struct mfc_cache_cmp_arg arg = {
888 .mfc_mcastgrp = htonl(INADDR_ANY),
889 .mfc_origin = htonl(INADDR_ANY)
891 struct rhlist_head *tmp, *list;
894 list = rhltable_lookup(&mrt->mfc_hash, &arg, ipmr_rht_params);
895 rhl_for_each_entry_rcu(c, tmp, list, mnode)
896 if (c->mfc_un.res.ttls[vifi] < 255)
902 /* Look for a (*,G) entry */
903 static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt,
904 __be32 mcastgrp, int vifi)
906 struct mfc_cache_cmp_arg arg = {
907 .mfc_mcastgrp = mcastgrp,
908 .mfc_origin = htonl(INADDR_ANY)
910 struct rhlist_head *tmp, *list;
911 struct mfc_cache *c, *proxy;
913 if (mcastgrp == htonl(INADDR_ANY))
916 list = rhltable_lookup(&mrt->mfc_hash, &arg, ipmr_rht_params);
917 rhl_for_each_entry_rcu(c, tmp, list, mnode) {
918 if (c->mfc_un.res.ttls[vifi] < 255)
921 /* It's ok if the vifi is part of the static tree */
922 proxy = ipmr_cache_find_any_parent(mrt, c->mfc_parent);
923 if (proxy && proxy->mfc_un.res.ttls[vifi] < 255)
928 return ipmr_cache_find_any_parent(mrt, vifi);
931 /* Look for a (S,G,iif) entry if parent != -1 */
932 static struct mfc_cache *ipmr_cache_find_parent(struct mr_table *mrt,
933 __be32 origin, __be32 mcastgrp,
936 struct mfc_cache_cmp_arg arg = {
937 .mfc_mcastgrp = mcastgrp,
938 .mfc_origin = origin,
940 struct rhlist_head *tmp, *list;
943 list = rhltable_lookup(&mrt->mfc_hash, &arg, ipmr_rht_params);
944 rhl_for_each_entry_rcu(c, tmp, list, mnode)
945 if (parent == -1 || parent == c->mfc_parent)
951 /* Allocate a multicast cache entry */
952 static struct mfc_cache *ipmr_cache_alloc(void)
954 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
957 c->mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
958 c->mfc_un.res.minvif = MAXVIFS;
963 static struct mfc_cache *ipmr_cache_alloc_unres(void)
965 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
968 skb_queue_head_init(&c->mfc_un.unres.unresolved);
969 c->mfc_un.unres.expires = jiffies + 10*HZ;
974 /* A cache entry has gone into a resolved state from queued */
975 static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
976 struct mfc_cache *uc, struct mfc_cache *c)
981 /* Play the pending entries through our router */
982 while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
983 if (ip_hdr(skb)->version == 0) {
984 struct nlmsghdr *nlh = skb_pull(skb,
985 sizeof(struct iphdr));
987 if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
988 nlh->nlmsg_len = skb_tail_pointer(skb) -
991 nlh->nlmsg_type = NLMSG_ERROR;
992 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
993 skb_trim(skb, nlh->nlmsg_len);
995 e->error = -EMSGSIZE;
996 memset(&e->msg, 0, sizeof(e->msg));
999 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1001 ip_mr_forward(net, mrt, skb->dev, skb, c, 0);
1006 /* Bounce a cache query up to mrouted and netlink.
1008 * Called under mrt_lock.
1010 static int ipmr_cache_report(struct mr_table *mrt,
1011 struct sk_buff *pkt, vifi_t vifi, int assert)
1013 const int ihl = ip_hdrlen(pkt);
1014 struct sock *mroute_sk;
1015 struct igmphdr *igmp;
1016 struct igmpmsg *msg;
1017 struct sk_buff *skb;
1020 if (assert == IGMPMSG_WHOLEPKT)
1021 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
1023 skb = alloc_skb(128, GFP_ATOMIC);
1028 if (assert == IGMPMSG_WHOLEPKT) {
1029 /* Ugly, but we have no choice with this interface.
1030 * Duplicate old header, fix ihl, length etc.
1031 * And all this only to mangle msg->im_msgtype and
1032 * to set msg->im_mbz to "mbz" :-)
1034 skb_push(skb, sizeof(struct iphdr));
1035 skb_reset_network_header(skb);
1036 skb_reset_transport_header(skb);
1037 msg = (struct igmpmsg *)skb_network_header(skb);
1038 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
1039 msg->im_msgtype = IGMPMSG_WHOLEPKT;
1041 msg->im_vif = mrt->mroute_reg_vif_num;
1042 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
1043 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
1044 sizeof(struct iphdr));
1046 /* Copy the IP header */
1047 skb_set_network_header(skb, skb->len);
1049 skb_copy_to_linear_data(skb, pkt->data, ihl);
1050 /* Flag to the kernel this is a route add */
1051 ip_hdr(skb)->protocol = 0;
1052 msg = (struct igmpmsg *)skb_network_header(skb);
1054 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1055 /* Add our header */
1056 igmp = skb_put(skb, sizeof(struct igmphdr));
1057 igmp->type = assert;
1058 msg->im_msgtype = assert;
1060 ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
1061 skb->transport_header = skb->network_header;
1065 mroute_sk = rcu_dereference(mrt->mroute_sk);
1072 igmpmsg_netlink_event(mrt, skb);
1074 /* Deliver to mrouted */
1075 ret = sock_queue_rcv_skb(mroute_sk, skb);
1078 net_warn_ratelimited("mroute: pending queue full, dropping entries\n");
1085 /* Queue a packet for resolution. It gets locked cache entry! */
1086 static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi,
1087 struct sk_buff *skb, struct net_device *dev)
1089 const struct iphdr *iph = ip_hdr(skb);
1090 struct mfc_cache *c;
1094 spin_lock_bh(&mfc_unres_lock);
1095 list_for_each_entry(c, &mrt->mfc_unres_queue, list) {
1096 if (c->mfc_mcastgrp == iph->daddr &&
1097 c->mfc_origin == iph->saddr) {
1104 /* Create a new entry if allowable */
1105 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
1106 (c = ipmr_cache_alloc_unres()) == NULL) {
1107 spin_unlock_bh(&mfc_unres_lock);
1113 /* Fill in the new cache entry */
1115 c->mfc_origin = iph->saddr;
1116 c->mfc_mcastgrp = iph->daddr;
1118 /* Reflect first query at mrouted. */
1119 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
1121 /* If the report failed throw the cache entry
1124 spin_unlock_bh(&mfc_unres_lock);
1131 atomic_inc(&mrt->cache_resolve_queue_len);
1132 list_add(&c->list, &mrt->mfc_unres_queue);
1133 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1135 if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
1136 mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires);
1139 /* See if we can append the packet */
1140 if (c->mfc_un.unres.unresolved.qlen > 3) {
1146 skb->skb_iif = dev->ifindex;
1148 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1152 spin_unlock_bh(&mfc_unres_lock);
1156 /* MFC cache manipulation by user space mroute daemon */
1158 static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent)
1160 struct mfc_cache *c;
1162 /* The entries are added/deleted only under RTNL */
1164 c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1165 mfc->mfcc_mcastgrp.s_addr, parent);
1169 rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params);
1170 list_del_rcu(&c->list);
1171 mroute_netlink_event(mrt, c, RTM_DELROUTE);
1177 static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
1178 struct mfcctl *mfc, int mrtsock, int parent)
1180 struct mfc_cache *uc, *c;
1184 if (mfc->mfcc_parent >= MAXVIFS)
1187 /* The entries are added/deleted only under RTNL */
1189 c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr,
1190 mfc->mfcc_mcastgrp.s_addr, parent);
1193 write_lock_bh(&mrt_lock);
1194 c->mfc_parent = mfc->mfcc_parent;
1195 ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
1197 c->mfc_flags |= MFC_STATIC;
1198 write_unlock_bh(&mrt_lock);
1199 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1203 if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) &&
1204 !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
1207 c = ipmr_cache_alloc();
1211 c->mfc_origin = mfc->mfcc_origin.s_addr;
1212 c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
1213 c->mfc_parent = mfc->mfcc_parent;
1214 ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
1216 c->mfc_flags |= MFC_STATIC;
1218 ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->mnode,
1221 pr_err("ipmr: rhtable insert error %d\n", ret);
1225 list_add_tail_rcu(&c->list, &mrt->mfc_cache_list);
1226 /* Check to see if we resolved a queued list. If so we
1227 * need to send on the frames and tidy up.
1230 spin_lock_bh(&mfc_unres_lock);
1231 list_for_each_entry(uc, &mrt->mfc_unres_queue, list) {
1232 if (uc->mfc_origin == c->mfc_origin &&
1233 uc->mfc_mcastgrp == c->mfc_mcastgrp) {
1234 list_del(&uc->list);
1235 atomic_dec(&mrt->cache_resolve_queue_len);
1240 if (list_empty(&mrt->mfc_unres_queue))
1241 del_timer(&mrt->ipmr_expire_timer);
1242 spin_unlock_bh(&mfc_unres_lock);
1245 ipmr_cache_resolve(net, mrt, uc, c);
1246 ipmr_cache_free(uc);
1248 mroute_netlink_event(mrt, c, RTM_NEWROUTE);
1252 /* Close the multicast socket, and clear the vif tables etc */
1253 static void mroute_clean_tables(struct mr_table *mrt, bool all)
1255 struct mfc_cache *c, *tmp;
1259 /* Shut down all active vif entries */
1260 for (i = 0; i < mrt->maxvif; i++) {
1261 if (!all && (mrt->vif_table[i].flags & VIFF_STATIC))
1263 vif_delete(mrt, i, 0, &list);
1265 unregister_netdevice_many(&list);
1267 /* Wipe the cache */
1268 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
1269 if (!all && (c->mfc_flags & MFC_STATIC))
1271 rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params);
1272 list_del_rcu(&c->list);
1273 mroute_netlink_event(mrt, c, RTM_DELROUTE);
1277 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1278 spin_lock_bh(&mfc_unres_lock);
1279 list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
1281 mroute_netlink_event(mrt, c, RTM_DELROUTE);
1282 ipmr_destroy_unres(mrt, c);
1284 spin_unlock_bh(&mfc_unres_lock);
1288 /* called from ip_ra_control(), before an RCU grace period,
1289 * we dont need to call synchronize_rcu() here
1291 static void mrtsock_destruct(struct sock *sk)
1293 struct net *net = sock_net(sk);
1294 struct mr_table *mrt;
1297 ipmr_for_each_table(mrt, net) {
1298 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1299 IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
1300 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1301 NETCONFA_MC_FORWARDING,
1302 NETCONFA_IFINDEX_ALL,
1303 net->ipv4.devconf_all);
1304 RCU_INIT_POINTER(mrt->mroute_sk, NULL);
1305 mroute_clean_tables(mrt, false);
1310 /* Socket options and virtual interface manipulation. The whole
1311 * virtual interface system is a complete heap, but unfortunately
1312 * that's how BSD mrouted happens to think. Maybe one day with a proper
1313 * MOSPF/PIM router set up we can clean this up.
1316 int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
1317 unsigned int optlen)
1319 struct net *net = sock_net(sk);
1320 int val, ret = 0, parent = 0;
1321 struct mr_table *mrt;
1326 /* There's one exception to the lock - MRT_DONE which needs to unlock */
1328 if (sk->sk_type != SOCK_RAW ||
1329 inet_sk(sk)->inet_num != IPPROTO_IGMP) {
1334 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1339 if (optname != MRT_INIT) {
1340 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
1341 !ns_capable(net->user_ns, CAP_NET_ADMIN)) {
1349 if (optlen != sizeof(int)) {
1353 if (rtnl_dereference(mrt->mroute_sk)) {
1358 ret = ip_ra_control(sk, 1, mrtsock_destruct);
1360 rcu_assign_pointer(mrt->mroute_sk, sk);
1361 IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
1362 inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
1363 NETCONFA_MC_FORWARDING,
1364 NETCONFA_IFINDEX_ALL,
1365 net->ipv4.devconf_all);
1369 if (sk != rcu_access_pointer(mrt->mroute_sk)) {
1372 ret = ip_ra_control(sk, 0, NULL);
1378 if (optlen != sizeof(vif)) {
1382 if (copy_from_user(&vif, optval, sizeof(vif))) {
1386 if (vif.vifc_vifi >= MAXVIFS) {
1390 if (optname == MRT_ADD_VIF) {
1391 ret = vif_add(net, mrt, &vif,
1392 sk == rtnl_dereference(mrt->mroute_sk));
1394 ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
1397 /* Manipulate the forwarding caches. These live
1398 * in a sort of kernel/user symbiosis.
1403 case MRT_ADD_MFC_PROXY:
1404 case MRT_DEL_MFC_PROXY:
1405 if (optlen != sizeof(mfc)) {
1409 if (copy_from_user(&mfc, optval, sizeof(mfc))) {
1414 parent = mfc.mfcc_parent;
1415 if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY)
1416 ret = ipmr_mfc_delete(mrt, &mfc, parent);
1418 ret = ipmr_mfc_add(net, mrt, &mfc,
1419 sk == rtnl_dereference(mrt->mroute_sk),
1422 /* Control PIM assert. */
1424 if (optlen != sizeof(val)) {
1428 if (get_user(val, (int __user *)optval)) {
1432 mrt->mroute_do_assert = val;
1435 if (!ipmr_pimsm_enabled()) {
1439 if (optlen != sizeof(val)) {
1443 if (get_user(val, (int __user *)optval)) {
1449 if (val != mrt->mroute_do_pim) {
1450 mrt->mroute_do_pim = val;
1451 mrt->mroute_do_assert = val;
1455 if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) {
1459 if (optlen != sizeof(uval)) {
1463 if (get_user(uval, (u32 __user *)optval)) {
1468 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1471 mrt = ipmr_new_table(net, uval);
1475 raw_sk(sk)->ipmr_table = uval;
1478 /* Spurious command, or MRT_VERSION which you cannot set. */
1487 /* Getsock opt support for the multicast routing system. */
1488 int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen)
1492 struct net *net = sock_net(sk);
1493 struct mr_table *mrt;
1495 if (sk->sk_type != SOCK_RAW ||
1496 inet_sk(sk)->inet_num != IPPROTO_IGMP)
1499 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1508 if (!ipmr_pimsm_enabled())
1509 return -ENOPROTOOPT;
1510 val = mrt->mroute_do_pim;
1513 val = mrt->mroute_do_assert;
1516 return -ENOPROTOOPT;
1519 if (get_user(olr, optlen))
1521 olr = min_t(unsigned int, olr, sizeof(int));
1524 if (put_user(olr, optlen))
1526 if (copy_to_user(optval, &val, olr))
1531 /* The IP multicast ioctl support routines. */
1532 int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
1534 struct sioc_sg_req sr;
1535 struct sioc_vif_req vr;
1536 struct vif_device *vif;
1537 struct mfc_cache *c;
1538 struct net *net = sock_net(sk);
1539 struct mr_table *mrt;
1541 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1547 if (copy_from_user(&vr, arg, sizeof(vr)))
1549 if (vr.vifi >= mrt->maxvif)
1551 read_lock(&mrt_lock);
1552 vif = &mrt->vif_table[vr.vifi];
1553 if (VIF_EXISTS(mrt, vr.vifi)) {
1554 vr.icount = vif->pkt_in;
1555 vr.ocount = vif->pkt_out;
1556 vr.ibytes = vif->bytes_in;
1557 vr.obytes = vif->bytes_out;
1558 read_unlock(&mrt_lock);
1560 if (copy_to_user(arg, &vr, sizeof(vr)))
1564 read_unlock(&mrt_lock);
1565 return -EADDRNOTAVAIL;
1567 if (copy_from_user(&sr, arg, sizeof(sr)))
1571 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1573 sr.pktcnt = c->mfc_un.res.pkt;
1574 sr.bytecnt = c->mfc_un.res.bytes;
1575 sr.wrong_if = c->mfc_un.res.wrong_if;
1578 if (copy_to_user(arg, &sr, sizeof(sr)))
1583 return -EADDRNOTAVAIL;
1585 return -ENOIOCTLCMD;
1589 #ifdef CONFIG_COMPAT
1590 struct compat_sioc_sg_req {
1593 compat_ulong_t pktcnt;
1594 compat_ulong_t bytecnt;
1595 compat_ulong_t wrong_if;
1598 struct compat_sioc_vif_req {
1599 vifi_t vifi; /* Which iface */
1600 compat_ulong_t icount;
1601 compat_ulong_t ocount;
1602 compat_ulong_t ibytes;
1603 compat_ulong_t obytes;
1606 int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1608 struct compat_sioc_sg_req sr;
1609 struct compat_sioc_vif_req vr;
1610 struct vif_device *vif;
1611 struct mfc_cache *c;
1612 struct net *net = sock_net(sk);
1613 struct mr_table *mrt;
1615 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1621 if (copy_from_user(&vr, arg, sizeof(vr)))
1623 if (vr.vifi >= mrt->maxvif)
1625 vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif);
1626 read_lock(&mrt_lock);
1627 vif = &mrt->vif_table[vr.vifi];
1628 if (VIF_EXISTS(mrt, vr.vifi)) {
1629 vr.icount = vif->pkt_in;
1630 vr.ocount = vif->pkt_out;
1631 vr.ibytes = vif->bytes_in;
1632 vr.obytes = vif->bytes_out;
1633 read_unlock(&mrt_lock);
1635 if (copy_to_user(arg, &vr, sizeof(vr)))
1639 read_unlock(&mrt_lock);
1640 return -EADDRNOTAVAIL;
1642 if (copy_from_user(&sr, arg, sizeof(sr)))
1646 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1648 sr.pktcnt = c->mfc_un.res.pkt;
1649 sr.bytecnt = c->mfc_un.res.bytes;
1650 sr.wrong_if = c->mfc_un.res.wrong_if;
1653 if (copy_to_user(arg, &sr, sizeof(sr)))
1658 return -EADDRNOTAVAIL;
1660 return -ENOIOCTLCMD;
1665 static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
1667 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1668 struct net *net = dev_net(dev);
1669 struct mr_table *mrt;
1670 struct vif_device *v;
1673 if (event != NETDEV_UNREGISTER)
1676 ipmr_for_each_table(mrt, net) {
1677 v = &mrt->vif_table[0];
1678 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1680 vif_delete(mrt, ct, 1, NULL);
1686 static struct notifier_block ip_mr_notifier = {
1687 .notifier_call = ipmr_device_event,
1690 /* Encapsulate a packet by attaching a valid IPIP header to it.
1691 * This avoids tunnel drivers and other mess and gives us the speed so
1692 * important for multicast video.
1694 static void ip_encap(struct net *net, struct sk_buff *skb,
1695 __be32 saddr, __be32 daddr)
1698 const struct iphdr *old_iph = ip_hdr(skb);
1700 skb_push(skb, sizeof(struct iphdr));
1701 skb->transport_header = skb->network_header;
1702 skb_reset_network_header(skb);
1706 iph->tos = old_iph->tos;
1707 iph->ttl = old_iph->ttl;
1711 iph->protocol = IPPROTO_IPIP;
1713 iph->tot_len = htons(skb->len);
1714 ip_select_ident(net, skb, NULL);
1717 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1721 static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
1722 struct sk_buff *skb)
1724 struct ip_options *opt = &(IPCB(skb)->opt);
1726 IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS);
1727 IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len);
1729 if (unlikely(opt->optlen))
1730 ip_forward_options(skb);
1732 return dst_output(net, sk, skb);
1735 /* Processing handlers for ipmr_forward */
1737 static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
1738 struct sk_buff *skb, struct mfc_cache *c, int vifi)
1740 const struct iphdr *iph = ip_hdr(skb);
1741 struct vif_device *vif = &mrt->vif_table[vifi];
1742 struct net_device *dev;
1750 if (vif->flags & VIFF_REGISTER) {
1752 vif->bytes_out += skb->len;
1753 vif->dev->stats.tx_bytes += skb->len;
1754 vif->dev->stats.tx_packets++;
1755 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
1759 if (vif->flags & VIFF_TUNNEL) {
1760 rt = ip_route_output_ports(net, &fl4, NULL,
1761 vif->remote, vif->local,
1764 RT_TOS(iph->tos), vif->link);
1767 encap = sizeof(struct iphdr);
1769 rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0,
1772 RT_TOS(iph->tos), vif->link);
1779 if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
1780 /* Do not fragment multicasts. Alas, IPv4 does not
1781 * allow to send ICMP, so that packets will disappear
1784 IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS);
1789 encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
1791 if (skb_cow(skb, encap)) {
1797 vif->bytes_out += skb->len;
1800 skb_dst_set(skb, &rt->dst);
1801 ip_decrease_ttl(ip_hdr(skb));
1803 /* FIXME: forward and output firewalls used to be called here.
1804 * What do we do with netfilter? -- RR
1806 if (vif->flags & VIFF_TUNNEL) {
1807 ip_encap(net, skb, vif->local, vif->remote);
1808 /* FIXME: extra output firewall step used to be here. --RR */
1809 vif->dev->stats.tx_packets++;
1810 vif->dev->stats.tx_bytes += skb->len;
1813 IPCB(skb)->flags |= IPSKB_FORWARDED;
1815 /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1816 * not only before forwarding, but after forwarding on all output
1817 * interfaces. It is clear, if mrouter runs a multicasting
1818 * program, it should receive packets not depending to what interface
1819 * program is joined.
1820 * If we will not make it, the program will have to join on all
1821 * interfaces. On the other hand, multihoming host (or router, but
1822 * not mrouter) cannot join to more than one interface - it will
1823 * result in receiving multiple packets.
1825 NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD,
1826 net, NULL, skb, skb->dev, dev,
1827 ipmr_forward_finish);
1834 static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev)
1838 for (ct = mrt->maxvif-1; ct >= 0; ct--) {
1839 if (mrt->vif_table[ct].dev == dev)
1845 /* "local" means that we should preserve one skb (for local delivery) */
1846 static void ip_mr_forward(struct net *net, struct mr_table *mrt,
1847 struct net_device *dev, struct sk_buff *skb,
1848 struct mfc_cache *cache, int local)
1850 int true_vifi = ipmr_find_vif(mrt, dev);
1854 vif = cache->mfc_parent;
1855 cache->mfc_un.res.pkt++;
1856 cache->mfc_un.res.bytes += skb->len;
1857 cache->mfc_un.res.lastuse = jiffies;
1859 if (cache->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
1860 struct mfc_cache *cache_proxy;
1862 /* For an (*,G) entry, we only check that the incomming
1863 * interface is part of the static tree.
1865 cache_proxy = ipmr_cache_find_any_parent(mrt, vif);
1867 cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
1871 /* Wrong interface: drop packet and (maybe) send PIM assert. */
1872 if (mrt->vif_table[vif].dev != dev) {
1873 if (rt_is_output_route(skb_rtable(skb))) {
1874 /* It is our own packet, looped back.
1875 * Very complicated situation...
1877 * The best workaround until routing daemons will be
1878 * fixed is not to redistribute packet, if it was
1879 * send through wrong interface. It means, that
1880 * multicast applications WILL NOT work for
1881 * (S,G), which have default multicast route pointing
1882 * to wrong oif. In any case, it is not a good
1883 * idea to use multicasting applications on router.
1888 cache->mfc_un.res.wrong_if++;
1890 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1891 /* pimsm uses asserts, when switching from RPT to SPT,
1892 * so that we cannot check that packet arrived on an oif.
1893 * It is bad, but otherwise we would need to move pretty
1894 * large chunk of pimd to kernel. Ough... --ANK
1896 (mrt->mroute_do_pim ||
1897 cache->mfc_un.res.ttls[true_vifi] < 255) &&
1899 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
1900 cache->mfc_un.res.last_assert = jiffies;
1901 ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
1907 mrt->vif_table[vif].pkt_in++;
1908 mrt->vif_table[vif].bytes_in += skb->len;
1910 /* Forward the frame */
1911 if (cache->mfc_origin == htonl(INADDR_ANY) &&
1912 cache->mfc_mcastgrp == htonl(INADDR_ANY)) {
1913 if (true_vifi >= 0 &&
1914 true_vifi != cache->mfc_parent &&
1916 cache->mfc_un.res.ttls[cache->mfc_parent]) {
1917 /* It's an (*,*) entry and the packet is not coming from
1918 * the upstream: forward the packet to the upstream
1921 psend = cache->mfc_parent;
1926 for (ct = cache->mfc_un.res.maxvif - 1;
1927 ct >= cache->mfc_un.res.minvif; ct--) {
1928 /* For (*,G) entry, don't forward to the incoming interface */
1929 if ((cache->mfc_origin != htonl(INADDR_ANY) ||
1931 ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
1933 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1936 ipmr_queue_xmit(net, mrt, skb2, cache,
1945 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1948 ipmr_queue_xmit(net, mrt, skb2, cache, psend);
1950 ipmr_queue_xmit(net, mrt, skb, cache, psend);
1960 static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb)
1962 struct rtable *rt = skb_rtable(skb);
1963 struct iphdr *iph = ip_hdr(skb);
1964 struct flowi4 fl4 = {
1965 .daddr = iph->daddr,
1966 .saddr = iph->saddr,
1967 .flowi4_tos = RT_TOS(iph->tos),
1968 .flowi4_oif = (rt_is_output_route(rt) ?
1969 skb->dev->ifindex : 0),
1970 .flowi4_iif = (rt_is_output_route(rt) ?
1973 .flowi4_mark = skb->mark,
1975 struct mr_table *mrt;
1978 err = ipmr_fib_lookup(net, &fl4, &mrt);
1980 return ERR_PTR(err);
1984 /* Multicast packets for forwarding arrive here
1985 * Called with rcu_read_lock();
1987 int ip_mr_input(struct sk_buff *skb)
1989 struct mfc_cache *cache;
1990 struct net *net = dev_net(skb->dev);
1991 int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
1992 struct mr_table *mrt;
1993 struct net_device *dev;
1995 /* skb->dev passed in is the loX master dev for vrfs.
1996 * As there are no vifs associated with loopback devices,
1997 * get the proper interface that does have a vif associated with it.
2000 if (netif_is_l3_master(skb->dev)) {
2001 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
2008 /* Packet is looped back after forward, it should not be
2009 * forwarded second time, but still can be delivered locally.
2011 if (IPCB(skb)->flags & IPSKB_FORWARDED)
2014 mrt = ipmr_rt_fib_lookup(net, skb);
2017 return PTR_ERR(mrt);
2020 if (IPCB(skb)->opt.router_alert) {
2021 if (ip_call_ra_chain(skb))
2023 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
2024 /* IGMPv1 (and broken IGMPv2 implementations sort of
2025 * Cisco IOS <= 11.2(8)) do not put router alert
2026 * option to IGMP packets destined to routable
2027 * groups. It is very bad, because it means
2028 * that we can forward NO IGMP messages.
2030 struct sock *mroute_sk;
2032 mroute_sk = rcu_dereference(mrt->mroute_sk);
2035 raw_rcv(mroute_sk, skb);
2041 /* already under rcu_read_lock() */
2042 cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
2044 int vif = ipmr_find_vif(mrt, dev);
2047 cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,
2051 /* No usable cache entry */
2056 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2057 ip_local_deliver(skb);
2063 read_lock(&mrt_lock);
2064 vif = ipmr_find_vif(mrt, dev);
2066 int err2 = ipmr_cache_unresolved(mrt, vif, skb, dev);
2067 read_unlock(&mrt_lock);
2071 read_unlock(&mrt_lock);
2076 read_lock(&mrt_lock);
2077 ip_mr_forward(net, mrt, dev, skb, cache, local);
2078 read_unlock(&mrt_lock);
2081 return ip_local_deliver(skb);
2087 return ip_local_deliver(skb);
2092 #ifdef CONFIG_IP_PIMSM_V1
2093 /* Handle IGMP messages of PIMv1 */
2094 int pim_rcv_v1(struct sk_buff *skb)
2096 struct igmphdr *pim;
2097 struct net *net = dev_net(skb->dev);
2098 struct mr_table *mrt;
2100 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2103 pim = igmp_hdr(skb);
2105 mrt = ipmr_rt_fib_lookup(net, skb);
2108 if (!mrt->mroute_do_pim ||
2109 pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
2112 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2120 #ifdef CONFIG_IP_PIMSM_V2
2121 static int pim_rcv(struct sk_buff *skb)
2123 struct pimreghdr *pim;
2124 struct net *net = dev_net(skb->dev);
2125 struct mr_table *mrt;
2127 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
2130 pim = (struct pimreghdr *)skb_transport_header(skb);
2131 if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) ||
2132 (pim->flags & PIM_NULL_REGISTER) ||
2133 (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
2134 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
2137 mrt = ipmr_rt_fib_lookup(net, skb);
2140 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
2148 static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2149 struct mfc_cache *c, struct rtmsg *rtm)
2151 struct rta_mfc_stats mfcs;
2152 struct nlattr *mp_attr;
2153 struct rtnexthop *nhp;
2154 unsigned long lastuse;
2157 /* If cache is unresolved, don't try to parse IIF and OIF */
2158 if (c->mfc_parent >= MAXVIFS) {
2159 rtm->rtm_flags |= RTNH_F_UNRESOLVED;
2163 if (VIF_EXISTS(mrt, c->mfc_parent) &&
2164 nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0)
2167 if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH)))
2170 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2171 if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2172 if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) {
2173 nla_nest_cancel(skb, mp_attr);
2177 nhp->rtnh_flags = 0;
2178 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2179 nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex;
2180 nhp->rtnh_len = sizeof(*nhp);
2184 nla_nest_end(skb, mp_attr);
2186 lastuse = READ_ONCE(c->mfc_un.res.lastuse);
2187 lastuse = time_after_eq(jiffies, lastuse) ? jiffies - lastuse : 0;
2189 mfcs.mfcs_packets = c->mfc_un.res.pkt;
2190 mfcs.mfcs_bytes = c->mfc_un.res.bytes;
2191 mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
2192 if (nla_put_64bit(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs, RTA_PAD) ||
2193 nla_put_u64_64bit(skb, RTA_EXPIRES, jiffies_to_clock_t(lastuse),
2197 rtm->rtm_type = RTN_MULTICAST;
2201 int ipmr_get_route(struct net *net, struct sk_buff *skb,
2202 __be32 saddr, __be32 daddr,
2203 struct rtmsg *rtm, u32 portid)
2205 struct mfc_cache *cache;
2206 struct mr_table *mrt;
2209 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2214 cache = ipmr_cache_find(mrt, saddr, daddr);
2215 if (!cache && skb->dev) {
2216 int vif = ipmr_find_vif(mrt, skb->dev);
2219 cache = ipmr_cache_find_any(mrt, daddr, vif);
2222 struct sk_buff *skb2;
2224 struct net_device *dev;
2228 read_lock(&mrt_lock);
2230 vif = ipmr_find_vif(mrt, dev);
2232 read_unlock(&mrt_lock);
2236 skb2 = skb_clone(skb, GFP_ATOMIC);
2238 read_unlock(&mrt_lock);
2243 NETLINK_CB(skb2).portid = portid;
2244 skb_push(skb2, sizeof(struct iphdr));
2245 skb_reset_network_header(skb2);
2247 iph->ihl = sizeof(struct iphdr) >> 2;
2251 err = ipmr_cache_unresolved(mrt, vif, skb2, dev);
2252 read_unlock(&mrt_lock);
2257 read_lock(&mrt_lock);
2258 err = __ipmr_fill_mroute(mrt, skb, cache, rtm);
2259 read_unlock(&mrt_lock);
2264 static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2265 u32 portid, u32 seq, struct mfc_cache *c, int cmd,
2268 struct nlmsghdr *nlh;
2272 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2276 rtm = nlmsg_data(nlh);
2277 rtm->rtm_family = RTNL_FAMILY_IPMR;
2278 rtm->rtm_dst_len = 32;
2279 rtm->rtm_src_len = 32;
2281 rtm->rtm_table = mrt->id;
2282 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2283 goto nla_put_failure;
2284 rtm->rtm_type = RTN_MULTICAST;
2285 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2286 if (c->mfc_flags & MFC_STATIC)
2287 rtm->rtm_protocol = RTPROT_STATIC;
2289 rtm->rtm_protocol = RTPROT_MROUTED;
2292 if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) ||
2293 nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp))
2294 goto nla_put_failure;
2295 err = __ipmr_fill_mroute(mrt, skb, c, rtm);
2296 /* do not break the dump if cache is unresolved */
2297 if (err < 0 && err != -ENOENT)
2298 goto nla_put_failure;
2300 nlmsg_end(skb, nlh);
2304 nlmsg_cancel(skb, nlh);
2308 static size_t mroute_msgsize(bool unresolved, int maxvif)
2311 NLMSG_ALIGN(sizeof(struct rtmsg))
2312 + nla_total_size(4) /* RTA_TABLE */
2313 + nla_total_size(4) /* RTA_SRC */
2314 + nla_total_size(4) /* RTA_DST */
2319 + nla_total_size(4) /* RTA_IIF */
2320 + nla_total_size(0) /* RTA_MULTIPATH */
2321 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2323 + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
2329 static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc,
2332 struct net *net = read_pnet(&mrt->net);
2333 struct sk_buff *skb;
2336 skb = nlmsg_new(mroute_msgsize(mfc->mfc_parent >= MAXVIFS, mrt->maxvif),
2341 err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2345 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC);
2351 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err);
2354 static size_t igmpmsg_netlink_msgsize(size_t payloadlen)
2357 NLMSG_ALIGN(sizeof(struct rtgenmsg))
2358 + nla_total_size(1) /* IPMRA_CREPORT_MSGTYPE */
2359 + nla_total_size(4) /* IPMRA_CREPORT_VIF_ID */
2360 + nla_total_size(4) /* IPMRA_CREPORT_SRC_ADDR */
2361 + nla_total_size(4) /* IPMRA_CREPORT_DST_ADDR */
2362 /* IPMRA_CREPORT_PKT */
2363 + nla_total_size(payloadlen)
2369 static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt)
2371 struct net *net = read_pnet(&mrt->net);
2372 struct nlmsghdr *nlh;
2373 struct rtgenmsg *rtgenm;
2374 struct igmpmsg *msg;
2375 struct sk_buff *skb;
2379 payloadlen = pkt->len - sizeof(struct igmpmsg);
2380 msg = (struct igmpmsg *)skb_network_header(pkt);
2382 skb = nlmsg_new(igmpmsg_netlink_msgsize(payloadlen), GFP_ATOMIC);
2386 nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
2387 sizeof(struct rtgenmsg), 0);
2390 rtgenm = nlmsg_data(nlh);
2391 rtgenm->rtgen_family = RTNL_FAMILY_IPMR;
2392 if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) ||
2393 nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif) ||
2394 nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR,
2395 msg->im_src.s_addr) ||
2396 nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR,
2397 msg->im_dst.s_addr))
2398 goto nla_put_failure;
2400 nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen);
2401 if (!nla || skb_copy_bits(pkt, sizeof(struct igmpmsg),
2402 nla_data(nla), payloadlen))
2403 goto nla_put_failure;
2405 nlmsg_end(skb, nlh);
2407 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE_R, NULL, GFP_ATOMIC);
2411 nlmsg_cancel(skb, nlh);
2414 rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS);
2417 static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
2418 struct netlink_ext_ack *extack)
2420 struct net *net = sock_net(in_skb->sk);
2421 struct nlattr *tb[RTA_MAX + 1];
2422 struct sk_buff *skb = NULL;
2423 struct mfc_cache *cache;
2424 struct mr_table *mrt;
2430 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX,
2431 rtm_ipv4_policy, extack);
2435 rtm = nlmsg_data(nlh);
2437 src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0;
2438 grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
2439 tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
2441 mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT);
2447 /* entries are added/deleted only under RTNL */
2449 cache = ipmr_cache_find(mrt, src, grp);
2456 skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL);
2462 err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid,
2463 nlh->nlmsg_seq, cache,
2468 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2478 static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2480 struct net *net = sock_net(skb->sk);
2481 struct mr_table *mrt;
2482 struct mfc_cache *mfc;
2483 unsigned int t = 0, s_t;
2484 unsigned int e = 0, s_e;
2490 ipmr_for_each_table(mrt, net) {
2493 list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) {
2496 if (ipmr_fill_mroute(mrt, skb,
2497 NETLINK_CB(cb->skb).portid,
2506 spin_lock_bh(&mfc_unres_lock);
2507 list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) {
2510 if (ipmr_fill_mroute(mrt, skb,
2511 NETLINK_CB(cb->skb).portid,
2515 spin_unlock_bh(&mfc_unres_lock);
2521 spin_unlock_bh(&mfc_unres_lock);
2536 static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = {
2537 [RTA_SRC] = { .type = NLA_U32 },
2538 [RTA_DST] = { .type = NLA_U32 },
2539 [RTA_IIF] = { .type = NLA_U32 },
2540 [RTA_TABLE] = { .type = NLA_U32 },
2541 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2544 static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol)
2546 switch (rtm_protocol) {
2548 case RTPROT_MROUTED:
2554 static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc)
2556 struct rtnexthop *rtnh = nla_data(nla);
2557 int remaining = nla_len(nla), vifi = 0;
2559 while (rtnh_ok(rtnh, remaining)) {
2560 mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops;
2561 if (++vifi == MAXVIFS)
2563 rtnh = rtnh_next(rtnh, &remaining);
2566 return remaining > 0 ? -EINVAL : vifi;
2569 /* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */
2570 static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh,
2571 struct mfcctl *mfcc, int *mrtsock,
2572 struct mr_table **mrtret,
2573 struct netlink_ext_ack *extack)
2575 struct net_device *dev = NULL;
2576 u32 tblid = RT_TABLE_DEFAULT;
2577 struct mr_table *mrt;
2578 struct nlattr *attr;
2582 ret = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipmr_policy,
2586 rtm = nlmsg_data(nlh);
2589 if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 ||
2590 rtm->rtm_type != RTN_MULTICAST ||
2591 rtm->rtm_scope != RT_SCOPE_UNIVERSE ||
2592 !ipmr_rtm_validate_proto(rtm->rtm_protocol))
2595 memset(mfcc, 0, sizeof(*mfcc));
2596 mfcc->mfcc_parent = -1;
2598 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) {
2599 switch (nla_type(attr)) {
2601 mfcc->mfcc_origin.s_addr = nla_get_be32(attr);
2604 mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr);
2607 dev = __dev_get_by_index(net, nla_get_u32(attr));
2614 if (ipmr_nla_get_ttls(attr, mfcc) < 0) {
2623 tblid = nla_get_u32(attr);
2627 mrt = ipmr_get_table(net, tblid);
2633 *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0;
2635 mfcc->mfcc_parent = ipmr_find_vif(mrt, dev);
2641 /* takes care of both newroute and delroute */
2642 static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh,
2643 struct netlink_ext_ack *extack)
2645 struct net *net = sock_net(skb->sk);
2646 int ret, mrtsock, parent;
2647 struct mr_table *tbl;
2652 ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack);
2656 parent = ret ? mfcc.mfcc_parent : -1;
2657 if (nlh->nlmsg_type == RTM_NEWROUTE)
2658 return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent);
2660 return ipmr_mfc_delete(tbl, &mfcc, parent);
2663 static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb)
2665 u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len);
2667 if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) ||
2668 nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) ||
2669 nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM,
2670 mrt->mroute_reg_vif_num) ||
2671 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT,
2672 mrt->mroute_do_assert) ||
2673 nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim))
2679 static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb)
2681 struct nlattr *vif_nest;
2682 struct vif_device *vif;
2684 /* if the VIF doesn't exist just continue */
2685 if (!VIF_EXISTS(mrt, vifid))
2688 vif = &mrt->vif_table[vifid];
2689 vif_nest = nla_nest_start(skb, IPMRA_VIF);
2692 if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif->dev->ifindex) ||
2693 nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) ||
2694 nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) ||
2695 nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in,
2697 nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out,
2699 nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in,
2701 nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out,
2703 nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) ||
2704 nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) {
2705 nla_nest_cancel(skb, vif_nest);
2708 nla_nest_end(skb, vif_nest);
2713 static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb)
2715 struct net *net = sock_net(skb->sk);
2716 struct nlmsghdr *nlh = NULL;
2717 unsigned int t = 0, s_t;
2718 unsigned int e = 0, s_e;
2719 struct mr_table *mrt;
2724 ipmr_for_each_table(mrt, net) {
2725 struct nlattr *vifs, *af;
2726 struct ifinfomsg *hdr;
2731 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
2732 cb->nlh->nlmsg_seq, RTM_NEWLINK,
2733 sizeof(*hdr), NLM_F_MULTI);
2737 hdr = nlmsg_data(nlh);
2738 memset(hdr, 0, sizeof(*hdr));
2739 hdr->ifi_family = RTNL_FAMILY_IPMR;
2741 af = nla_nest_start(skb, IFLA_AF_SPEC);
2743 nlmsg_cancel(skb, nlh);
2747 if (!ipmr_fill_table(mrt, skb)) {
2748 nlmsg_cancel(skb, nlh);
2752 vifs = nla_nest_start(skb, IPMRA_TABLE_VIFS);
2754 nla_nest_end(skb, af);
2755 nlmsg_end(skb, nlh);
2758 for (i = 0; i < mrt->maxvif; i++) {
2761 if (!ipmr_fill_vif(mrt, i, skb)) {
2762 nla_nest_end(skb, vifs);
2763 nla_nest_end(skb, af);
2764 nlmsg_end(skb, nlh);
2772 nla_nest_end(skb, vifs);
2773 nla_nest_end(skb, af);
2774 nlmsg_end(skb, nlh);
2786 #ifdef CONFIG_PROC_FS
2787 /* The /proc interfaces to multicast routing :
2788 * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
2790 struct ipmr_vif_iter {
2791 struct seq_net_private p;
2792 struct mr_table *mrt;
2796 static struct vif_device *ipmr_vif_seq_idx(struct net *net,
2797 struct ipmr_vif_iter *iter,
2800 struct mr_table *mrt = iter->mrt;
2802 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
2803 if (!VIF_EXISTS(mrt, iter->ct))
2806 return &mrt->vif_table[iter->ct];
2811 static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
2812 __acquires(mrt_lock)
2814 struct ipmr_vif_iter *iter = seq->private;
2815 struct net *net = seq_file_net(seq);
2816 struct mr_table *mrt;
2818 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2820 return ERR_PTR(-ENOENT);
2824 read_lock(&mrt_lock);
2825 return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1)
2829 static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2831 struct ipmr_vif_iter *iter = seq->private;
2832 struct net *net = seq_file_net(seq);
2833 struct mr_table *mrt = iter->mrt;
2836 if (v == SEQ_START_TOKEN)
2837 return ipmr_vif_seq_idx(net, iter, 0);
2839 while (++iter->ct < mrt->maxvif) {
2840 if (!VIF_EXISTS(mrt, iter->ct))
2842 return &mrt->vif_table[iter->ct];
2847 static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
2848 __releases(mrt_lock)
2850 read_unlock(&mrt_lock);
2853 static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
2855 struct ipmr_vif_iter *iter = seq->private;
2856 struct mr_table *mrt = iter->mrt;
2858 if (v == SEQ_START_TOKEN) {
2860 "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n");
2862 const struct vif_device *vif = v;
2863 const char *name = vif->dev ? vif->dev->name : "none";
2866 "%2zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n",
2867 vif - mrt->vif_table,
2868 name, vif->bytes_in, vif->pkt_in,
2869 vif->bytes_out, vif->pkt_out,
2870 vif->flags, vif->local, vif->remote);
2875 static const struct seq_operations ipmr_vif_seq_ops = {
2876 .start = ipmr_vif_seq_start,
2877 .next = ipmr_vif_seq_next,
2878 .stop = ipmr_vif_seq_stop,
2879 .show = ipmr_vif_seq_show,
2882 static int ipmr_vif_open(struct inode *inode, struct file *file)
2884 return seq_open_net(inode, file, &ipmr_vif_seq_ops,
2885 sizeof(struct ipmr_vif_iter));
2888 static const struct file_operations ipmr_vif_fops = {
2889 .owner = THIS_MODULE,
2890 .open = ipmr_vif_open,
2892 .llseek = seq_lseek,
2893 .release = seq_release_net,
2896 struct ipmr_mfc_iter {
2897 struct seq_net_private p;
2898 struct mr_table *mrt;
2899 struct list_head *cache;
2902 static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net,
2903 struct ipmr_mfc_iter *it, loff_t pos)
2905 struct mr_table *mrt = it->mrt;
2906 struct mfc_cache *mfc;
2909 it->cache = &mrt->mfc_cache_list;
2910 list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list)
2915 spin_lock_bh(&mfc_unres_lock);
2916 it->cache = &mrt->mfc_unres_queue;
2917 list_for_each_entry(mfc, it->cache, list)
2920 spin_unlock_bh(&mfc_unres_lock);
2927 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
2929 struct ipmr_mfc_iter *it = seq->private;
2930 struct net *net = seq_file_net(seq);
2931 struct mr_table *mrt;
2933 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2935 return ERR_PTR(-ENOENT);
2939 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
2943 static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2945 struct ipmr_mfc_iter *it = seq->private;
2946 struct net *net = seq_file_net(seq);
2947 struct mr_table *mrt = it->mrt;
2948 struct mfc_cache *mfc = v;
2952 if (v == SEQ_START_TOKEN)
2953 return ipmr_mfc_seq_idx(net, seq->private, 0);
2955 if (mfc->list.next != it->cache)
2956 return list_entry(mfc->list.next, struct mfc_cache, list);
2958 if (it->cache == &mrt->mfc_unres_queue)
2961 /* exhausted cache_array, show unresolved */
2963 it->cache = &mrt->mfc_unres_queue;
2965 spin_lock_bh(&mfc_unres_lock);
2966 if (!list_empty(it->cache))
2967 return list_first_entry(it->cache, struct mfc_cache, list);
2970 spin_unlock_bh(&mfc_unres_lock);
2976 static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
2978 struct ipmr_mfc_iter *it = seq->private;
2979 struct mr_table *mrt = it->mrt;
2981 if (it->cache == &mrt->mfc_unres_queue)
2982 spin_unlock_bh(&mfc_unres_lock);
2983 else if (it->cache == &mrt->mfc_cache_list)
2987 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
2991 if (v == SEQ_START_TOKEN) {
2993 "Group Origin Iif Pkts Bytes Wrong Oifs\n");
2995 const struct mfc_cache *mfc = v;
2996 const struct ipmr_mfc_iter *it = seq->private;
2997 const struct mr_table *mrt = it->mrt;
2999 seq_printf(seq, "%08X %08X %-3hd",
3000 (__force u32) mfc->mfc_mcastgrp,
3001 (__force u32) mfc->mfc_origin,
3004 if (it->cache != &mrt->mfc_unres_queue) {
3005 seq_printf(seq, " %8lu %8lu %8lu",
3006 mfc->mfc_un.res.pkt,
3007 mfc->mfc_un.res.bytes,
3008 mfc->mfc_un.res.wrong_if);
3009 for (n = mfc->mfc_un.res.minvif;
3010 n < mfc->mfc_un.res.maxvif; n++) {
3011 if (VIF_EXISTS(mrt, n) &&
3012 mfc->mfc_un.res.ttls[n] < 255)
3015 n, mfc->mfc_un.res.ttls[n]);
3018 /* unresolved mfc_caches don't contain
3019 * pkt, bytes and wrong_if values
3021 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
3023 seq_putc(seq, '\n');
3028 static const struct seq_operations ipmr_mfc_seq_ops = {
3029 .start = ipmr_mfc_seq_start,
3030 .next = ipmr_mfc_seq_next,
3031 .stop = ipmr_mfc_seq_stop,
3032 .show = ipmr_mfc_seq_show,
3035 static int ipmr_mfc_open(struct inode *inode, struct file *file)
3037 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
3038 sizeof(struct ipmr_mfc_iter));
3041 static const struct file_operations ipmr_mfc_fops = {
3042 .owner = THIS_MODULE,
3043 .open = ipmr_mfc_open,
3045 .llseek = seq_lseek,
3046 .release = seq_release_net,
3050 #ifdef CONFIG_IP_PIMSM_V2
3051 static const struct net_protocol pim_protocol = {
3057 /* Setup for IP multicast routing */
3058 static int __net_init ipmr_net_init(struct net *net)
3062 err = ipmr_rules_init(net);
3066 #ifdef CONFIG_PROC_FS
3068 if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops))
3070 if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops))
3071 goto proc_cache_fail;
3075 #ifdef CONFIG_PROC_FS
3077 remove_proc_entry("ip_mr_vif", net->proc_net);
3079 ipmr_rules_exit(net);
3085 static void __net_exit ipmr_net_exit(struct net *net)
3087 #ifdef CONFIG_PROC_FS
3088 remove_proc_entry("ip_mr_cache", net->proc_net);
3089 remove_proc_entry("ip_mr_vif", net->proc_net);
3091 ipmr_rules_exit(net);
3094 static struct pernet_operations ipmr_net_ops = {
3095 .init = ipmr_net_init,
3096 .exit = ipmr_net_exit,
3099 int __init ip_mr_init(void)
3103 mrt_cachep = kmem_cache_create("ip_mrt_cache",
3104 sizeof(struct mfc_cache),
3105 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
3108 err = register_pernet_subsys(&ipmr_net_ops);
3110 goto reg_pernet_fail;
3112 err = register_netdevice_notifier(&ip_mr_notifier);
3114 goto reg_notif_fail;
3115 #ifdef CONFIG_IP_PIMSM_V2
3116 if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
3117 pr_err("%s: can't add PIM protocol\n", __func__);
3119 goto add_proto_fail;
3122 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
3123 ipmr_rtm_getroute, ipmr_rtm_dumproute, 0);
3124 rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE,
3125 ipmr_rtm_route, NULL, 0);
3126 rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE,
3127 ipmr_rtm_route, NULL, 0);
3129 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK,
3130 NULL, ipmr_rtm_dumplink, 0);
3133 #ifdef CONFIG_IP_PIMSM_V2
3135 unregister_netdevice_notifier(&ip_mr_notifier);
3138 unregister_pernet_subsys(&ipmr_net_ops);
3140 kmem_cache_destroy(mrt_cachep);