1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Linux IPv6 multicast routing support for BSD pim6sd
4 * Based on net/ipv4/ipmr.c.
6 * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
7 * LSIIT Laboratory, Strasbourg, France
8 * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
10 * Copyright (C)2007,2008 USAGI/WIDE Project
11 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
14 #include <linux/uaccess.h>
15 #include <linux/types.h>
16 #include <linux/sched.h>
17 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/fcntl.h>
21 #include <linux/stat.h>
22 #include <linux/socket.h>
23 #include <linux/inet.h>
24 #include <linux/netdevice.h>
25 #include <linux/inetdevice.h>
26 #include <linux/proc_fs.h>
27 #include <linux/seq_file.h>
28 #include <linux/init.h>
29 #include <linux/compat.h>
30 #include <linux/rhashtable.h>
31 #include <net/protocol.h>
32 #include <linux/skbuff.h>
34 #include <linux/notifier.h>
35 #include <linux/if_arp.h>
36 #include <net/checksum.h>
37 #include <net/netlink.h>
38 #include <net/fib_rules.h>
41 #include <net/ip6_route.h>
42 #include <linux/mroute6.h>
43 #include <linux/pim.h>
44 #include <net/addrconf.h>
45 #include <linux/netfilter_ipv6.h>
46 #include <linux/export.h>
47 #include <net/ip6_checksum.h>
48 #include <linux/netconf.h>
49 #include <net/ip_tunnels.h>
51 #include <linux/nospec.h>
54 struct fib_rule common;
61 /* Big lock, protecting vif table, mrt cache and mroute socket state.
62 Note that the changes are semaphored via rtnl_lock.
65 static DEFINE_RWLOCK(mrt_lock);
67 /* Multicast router control variables */
69 /* Special spinlock for queue of unresolved entries */
70 static DEFINE_SPINLOCK(mfc_unres_lock);
72 /* We return to original Alan's scheme. Hash table of resolved
73 entries is changed only in process context and protected
74 with weak lock mrt_lock. Queue of unresolved entries is protected
75 with strong spinlock mfc_unres_lock.
77 In this case data path is free of exclusive locks at all.
80 static struct kmem_cache *mrt_cachep __read_mostly;
82 static struct mr_table *ip6mr_new_table(struct net *net, u32 id);
83 static void ip6mr_free_table(struct mr_table *mrt);
85 static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
86 struct net_device *dev, struct sk_buff *skb,
87 struct mfc6_cache *cache);
88 static int ip6mr_cache_report(struct mr_table *mrt, struct sk_buff *pkt,
89 mifi_t mifi, int assert);
90 static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
92 static void mrt6msg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt);
93 static int ip6mr_rtm_dumproute(struct sk_buff *skb,
94 struct netlink_callback *cb);
95 static void mroute_clean_tables(struct mr_table *mrt, int flags);
96 static void ipmr_expire_process(struct timer_list *t);
98 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
99 #define ip6mr_for_each_table(mrt, net) \
100 list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list, \
101 lockdep_rtnl_is_held() || \
102 list_empty(&net->ipv6.mr6_tables))
104 static struct mr_table *ip6mr_mr_table_iter(struct net *net,
105 struct mr_table *mrt)
107 struct mr_table *ret;
110 ret = list_entry_rcu(net->ipv6.mr6_tables.next,
111 struct mr_table, list);
113 ret = list_entry_rcu(mrt->list.next,
114 struct mr_table, list);
116 if (&ret->list == &net->ipv6.mr6_tables)
121 static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
123 struct mr_table *mrt;
125 ip6mr_for_each_table(mrt, net) {
132 static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
133 struct mr_table **mrt)
136 struct ip6mr_result res;
137 struct fib_lookup_arg arg = {
139 .flags = FIB_LOOKUP_NOREF,
142 /* update flow if oif or iif point to device enslaved to l3mdev */
143 l3mdev_update_flow(net, flowi6_to_flowi(flp6));
145 err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
146 flowi6_to_flowi(flp6), 0, &arg);
153 static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
154 int flags, struct fib_lookup_arg *arg)
156 struct ip6mr_result *res = arg->result;
157 struct mr_table *mrt;
159 switch (rule->action) {
162 case FR_ACT_UNREACHABLE:
164 case FR_ACT_PROHIBIT:
166 case FR_ACT_BLACKHOLE:
171 arg->table = fib_rule_get_table(rule, arg);
173 mrt = ip6mr_get_table(rule->fr_net, arg->table);
180 static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
185 static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = {
189 static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
190 struct fib_rule_hdr *frh, struct nlattr **tb,
191 struct netlink_ext_ack *extack)
196 static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
202 static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
203 struct fib_rule_hdr *frh)
211 static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
212 .family = RTNL_FAMILY_IP6MR,
213 .rule_size = sizeof(struct ip6mr_rule),
214 .addr_size = sizeof(struct in6_addr),
215 .action = ip6mr_rule_action,
216 .match = ip6mr_rule_match,
217 .configure = ip6mr_rule_configure,
218 .compare = ip6mr_rule_compare,
219 .fill = ip6mr_rule_fill,
220 .nlgroup = RTNLGRP_IPV6_RULE,
221 .policy = ip6mr_rule_policy,
222 .owner = THIS_MODULE,
225 static int __net_init ip6mr_rules_init(struct net *net)
227 struct fib_rules_ops *ops;
228 struct mr_table *mrt;
231 ops = fib_rules_register(&ip6mr_rules_ops_template, net);
235 INIT_LIST_HEAD(&net->ipv6.mr6_tables);
237 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
243 err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
247 net->ipv6.mr6_rules_ops = ops;
251 ip6mr_free_table(mrt);
253 fib_rules_unregister(ops);
257 static void __net_exit ip6mr_rules_exit(struct net *net)
259 struct mr_table *mrt, *next;
262 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
263 list_del(&mrt->list);
264 ip6mr_free_table(mrt);
266 fib_rules_unregister(net->ipv6.mr6_rules_ops);
270 static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb,
271 struct netlink_ext_ack *extack)
273 return fib_rules_dump(net, nb, RTNL_FAMILY_IP6MR, extack);
276 static unsigned int ip6mr_rules_seq_read(struct net *net)
278 return fib_rules_seq_read(net, RTNL_FAMILY_IP6MR);
281 bool ip6mr_rule_default(const struct fib_rule *rule)
283 return fib_rule_matchall(rule) && rule->action == FR_ACT_TO_TBL &&
284 rule->table == RT6_TABLE_DFLT && !rule->l3mdev;
286 EXPORT_SYMBOL(ip6mr_rule_default);
288 #define ip6mr_for_each_table(mrt, net) \
289 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
291 static struct mr_table *ip6mr_mr_table_iter(struct net *net,
292 struct mr_table *mrt)
295 return net->ipv6.mrt6;
299 static struct mr_table *ip6mr_get_table(struct net *net, u32 id)
301 return net->ipv6.mrt6;
304 static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
305 struct mr_table **mrt)
307 *mrt = net->ipv6.mrt6;
311 static int __net_init ip6mr_rules_init(struct net *net)
313 struct mr_table *mrt;
315 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
318 net->ipv6.mrt6 = mrt;
322 static void __net_exit ip6mr_rules_exit(struct net *net)
325 ip6mr_free_table(net->ipv6.mrt6);
326 net->ipv6.mrt6 = NULL;
330 static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb,
331 struct netlink_ext_ack *extack)
336 static unsigned int ip6mr_rules_seq_read(struct net *net)
342 static int ip6mr_hash_cmp(struct rhashtable_compare_arg *arg,
345 const struct mfc6_cache_cmp_arg *cmparg = arg->key;
346 struct mfc6_cache *c = (struct mfc6_cache *)ptr;
348 return !ipv6_addr_equal(&c->mf6c_mcastgrp, &cmparg->mf6c_mcastgrp) ||
349 !ipv6_addr_equal(&c->mf6c_origin, &cmparg->mf6c_origin);
352 static const struct rhashtable_params ip6mr_rht_params = {
353 .head_offset = offsetof(struct mr_mfc, mnode),
354 .key_offset = offsetof(struct mfc6_cache, cmparg),
355 .key_len = sizeof(struct mfc6_cache_cmp_arg),
357 .obj_cmpfn = ip6mr_hash_cmp,
358 .automatic_shrinking = true,
361 static void ip6mr_new_table_set(struct mr_table *mrt,
364 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
365 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
369 static struct mfc6_cache_cmp_arg ip6mr_mr_table_ops_cmparg_any = {
370 .mf6c_origin = IN6ADDR_ANY_INIT,
371 .mf6c_mcastgrp = IN6ADDR_ANY_INIT,
374 static struct mr_table_ops ip6mr_mr_table_ops = {
375 .rht_params = &ip6mr_rht_params,
376 .cmparg_any = &ip6mr_mr_table_ops_cmparg_any,
379 static struct mr_table *ip6mr_new_table(struct net *net, u32 id)
381 struct mr_table *mrt;
383 mrt = ip6mr_get_table(net, id);
387 return mr_table_alloc(net, id, &ip6mr_mr_table_ops,
388 ipmr_expire_process, ip6mr_new_table_set);
391 static void ip6mr_free_table(struct mr_table *mrt)
393 del_timer_sync(&mrt->ipmr_expire_timer);
394 mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC |
395 MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC);
396 rhltable_destroy(&mrt->mfc_hash);
400 #ifdef CONFIG_PROC_FS
401 /* The /proc interfaces to multicast routing
402 * /proc/ip6_mr_cache /proc/ip6_mr_vif
405 static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
408 struct mr_vif_iter *iter = seq->private;
409 struct net *net = seq_file_net(seq);
410 struct mr_table *mrt;
412 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
414 return ERR_PTR(-ENOENT);
418 read_lock(&mrt_lock);
419 return mr_vif_seq_start(seq, pos);
422 static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
425 read_unlock(&mrt_lock);
428 static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
430 struct mr_vif_iter *iter = seq->private;
431 struct mr_table *mrt = iter->mrt;
433 if (v == SEQ_START_TOKEN) {
435 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
437 const struct vif_device *vif = v;
438 const char *name = vif->dev ? vif->dev->name : "none";
441 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
442 vif - mrt->vif_table,
443 name, vif->bytes_in, vif->pkt_in,
444 vif->bytes_out, vif->pkt_out,
450 static const struct seq_operations ip6mr_vif_seq_ops = {
451 .start = ip6mr_vif_seq_start,
452 .next = mr_vif_seq_next,
453 .stop = ip6mr_vif_seq_stop,
454 .show = ip6mr_vif_seq_show,
457 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
459 struct net *net = seq_file_net(seq);
460 struct mr_table *mrt;
462 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
464 return ERR_PTR(-ENOENT);
466 return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock);
469 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
473 if (v == SEQ_START_TOKEN) {
477 "Iif Pkts Bytes Wrong Oifs\n");
479 const struct mfc6_cache *mfc = v;
480 const struct mr_mfc_iter *it = seq->private;
481 struct mr_table *mrt = it->mrt;
483 seq_printf(seq, "%pI6 %pI6 %-3hd",
484 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
487 if (it->cache != &mrt->mfc_unres_queue) {
488 seq_printf(seq, " %8lu %8lu %8lu",
489 mfc->_c.mfc_un.res.pkt,
490 mfc->_c.mfc_un.res.bytes,
491 mfc->_c.mfc_un.res.wrong_if);
492 for (n = mfc->_c.mfc_un.res.minvif;
493 n < mfc->_c.mfc_un.res.maxvif; n++) {
494 if (VIF_EXISTS(mrt, n) &&
495 mfc->_c.mfc_un.res.ttls[n] < 255)
498 mfc->_c.mfc_un.res.ttls[n]);
501 /* unresolved mfc_caches don't contain
502 * pkt, bytes and wrong_if values
504 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
511 static const struct seq_operations ipmr_mfc_seq_ops = {
512 .start = ipmr_mfc_seq_start,
513 .next = mr_mfc_seq_next,
514 .stop = mr_mfc_seq_stop,
515 .show = ipmr_mfc_seq_show,
519 #ifdef CONFIG_IPV6_PIMSM_V2
521 static int pim6_rcv(struct sk_buff *skb)
523 struct pimreghdr *pim;
524 struct ipv6hdr *encap;
525 struct net_device *reg_dev = NULL;
526 struct net *net = dev_net(skb->dev);
527 struct mr_table *mrt;
528 struct flowi6 fl6 = {
529 .flowi6_iif = skb->dev->ifindex,
530 .flowi6_mark = skb->mark,
534 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
537 pim = (struct pimreghdr *)skb_transport_header(skb);
538 if (pim->type != ((PIM_VERSION << 4) | PIM_TYPE_REGISTER) ||
539 (pim->flags & PIM_NULL_REGISTER) ||
540 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
541 sizeof(*pim), IPPROTO_PIM,
542 csum_partial((void *)pim, sizeof(*pim), 0)) &&
543 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
546 /* check if the inner packet is destined to mcast group */
547 encap = (struct ipv6hdr *)(skb_transport_header(skb) +
550 if (!ipv6_addr_is_multicast(&encap->daddr) ||
551 encap->payload_len == 0 ||
552 ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
555 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
557 reg_vif_num = mrt->mroute_reg_vif_num;
559 read_lock(&mrt_lock);
560 if (reg_vif_num >= 0)
561 reg_dev = mrt->vif_table[reg_vif_num].dev;
563 read_unlock(&mrt_lock);
568 skb->mac_header = skb->network_header;
569 skb_pull(skb, (u8 *)encap - skb->data);
570 skb_reset_network_header(skb);
571 skb->protocol = htons(ETH_P_IPV6);
572 skb->ip_summed = CHECKSUM_NONE;
574 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
585 static const struct inet6_protocol pim6_protocol = {
589 /* Service routines creating virtual interfaces: PIMREG */
591 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
592 struct net_device *dev)
594 struct net *net = dev_net(dev);
595 struct mr_table *mrt;
596 struct flowi6 fl6 = {
597 .flowi6_oif = dev->ifindex,
598 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
599 .flowi6_mark = skb->mark,
602 if (!pskb_inet_may_pull(skb))
605 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
608 read_lock(&mrt_lock);
609 dev->stats.tx_bytes += skb->len;
610 dev->stats.tx_packets++;
611 ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
612 read_unlock(&mrt_lock);
617 dev->stats.tx_errors++;
622 static int reg_vif_get_iflink(const struct net_device *dev)
627 static const struct net_device_ops reg_vif_netdev_ops = {
628 .ndo_start_xmit = reg_vif_xmit,
629 .ndo_get_iflink = reg_vif_get_iflink,
632 static void reg_vif_setup(struct net_device *dev)
634 dev->type = ARPHRD_PIMREG;
635 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
636 dev->flags = IFF_NOARP;
637 dev->netdev_ops = ®_vif_netdev_ops;
638 dev->needs_free_netdev = true;
639 dev->features |= NETIF_F_NETNS_LOCAL;
642 static struct net_device *ip6mr_reg_vif(struct net *net, struct mr_table *mrt)
644 struct net_device *dev;
647 if (mrt->id == RT6_TABLE_DFLT)
648 sprintf(name, "pim6reg");
650 sprintf(name, "pim6reg%u", mrt->id);
652 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
656 dev_net_set(dev, net);
658 if (register_netdevice(dev)) {
663 if (dev_open(dev, NULL))
670 unregister_netdevice(dev);
675 static int call_ip6mr_vif_entry_notifiers(struct net *net,
676 enum fib_event_type event_type,
677 struct vif_device *vif,
678 mifi_t vif_index, u32 tb_id)
680 return mr_call_vif_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
681 vif, vif_index, tb_id,
682 &net->ipv6.ipmr_seq);
685 static int call_ip6mr_mfc_entry_notifiers(struct net *net,
686 enum fib_event_type event_type,
687 struct mfc6_cache *mfc, u32 tb_id)
689 return mr_call_mfc_notifiers(net, RTNL_FAMILY_IP6MR, event_type,
690 &mfc->_c, tb_id, &net->ipv6.ipmr_seq);
693 /* Delete a VIF entry */
694 static int mif6_delete(struct mr_table *mrt, int vifi, int notify,
695 struct list_head *head)
697 struct vif_device *v;
698 struct net_device *dev;
699 struct inet6_dev *in6_dev;
701 if (vifi < 0 || vifi >= mrt->maxvif)
702 return -EADDRNOTAVAIL;
704 v = &mrt->vif_table[vifi];
706 if (VIF_EXISTS(mrt, vifi))
707 call_ip6mr_vif_entry_notifiers(read_pnet(&mrt->net),
708 FIB_EVENT_VIF_DEL, v, vifi,
711 write_lock_bh(&mrt_lock);
716 write_unlock_bh(&mrt_lock);
717 return -EADDRNOTAVAIL;
720 #ifdef CONFIG_IPV6_PIMSM_V2
721 if (vifi == mrt->mroute_reg_vif_num)
722 mrt->mroute_reg_vif_num = -1;
725 if (vifi + 1 == mrt->maxvif) {
727 for (tmp = vifi - 1; tmp >= 0; tmp--) {
728 if (VIF_EXISTS(mrt, tmp))
731 mrt->maxvif = tmp + 1;
734 write_unlock_bh(&mrt_lock);
736 dev_set_allmulti(dev, -1);
738 in6_dev = __in6_dev_get(dev);
740 in6_dev->cnf.mc_forwarding--;
741 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
742 NETCONFA_MC_FORWARDING,
743 dev->ifindex, &in6_dev->cnf);
746 if ((v->flags & MIFF_REGISTER) && !notify)
747 unregister_netdevice_queue(dev, head);
753 static inline void ip6mr_cache_free_rcu(struct rcu_head *head)
755 struct mr_mfc *c = container_of(head, struct mr_mfc, rcu);
757 kmem_cache_free(mrt_cachep, (struct mfc6_cache *)c);
760 static inline void ip6mr_cache_free(struct mfc6_cache *c)
762 call_rcu(&c->_c.rcu, ip6mr_cache_free_rcu);
765 /* Destroy an unresolved cache entry, killing queued skbs
766 and reporting error to netlink readers.
769 static void ip6mr_destroy_unres(struct mr_table *mrt, struct mfc6_cache *c)
771 struct net *net = read_pnet(&mrt->net);
774 atomic_dec(&mrt->cache_resolve_queue_len);
776 while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved)) != NULL) {
777 if (ipv6_hdr(skb)->version == 0) {
778 struct nlmsghdr *nlh = skb_pull(skb,
779 sizeof(struct ipv6hdr));
780 nlh->nlmsg_type = NLMSG_ERROR;
781 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
782 skb_trim(skb, nlh->nlmsg_len);
783 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
784 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
793 /* Timer process for all the unresolved queue. */
795 static void ipmr_do_expire_process(struct mr_table *mrt)
797 unsigned long now = jiffies;
798 unsigned long expires = 10 * HZ;
799 struct mr_mfc *c, *next;
801 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
802 if (time_after(c->mfc_un.unres.expires, now)) {
804 unsigned long interval = c->mfc_un.unres.expires - now;
805 if (interval < expires)
811 mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
812 ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
815 if (!list_empty(&mrt->mfc_unres_queue))
816 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
819 static void ipmr_expire_process(struct timer_list *t)
821 struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer);
823 if (!spin_trylock(&mfc_unres_lock)) {
824 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
828 if (!list_empty(&mrt->mfc_unres_queue))
829 ipmr_do_expire_process(mrt);
831 spin_unlock(&mfc_unres_lock);
834 /* Fill oifs list. It is called under write locked mrt_lock. */
836 static void ip6mr_update_thresholds(struct mr_table *mrt,
837 struct mr_mfc *cache,
842 cache->mfc_un.res.minvif = MAXMIFS;
843 cache->mfc_un.res.maxvif = 0;
844 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
846 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
847 if (VIF_EXISTS(mrt, vifi) &&
848 ttls[vifi] && ttls[vifi] < 255) {
849 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
850 if (cache->mfc_un.res.minvif > vifi)
851 cache->mfc_un.res.minvif = vifi;
852 if (cache->mfc_un.res.maxvif <= vifi)
853 cache->mfc_un.res.maxvif = vifi + 1;
856 cache->mfc_un.res.lastuse = jiffies;
859 static int mif6_add(struct net *net, struct mr_table *mrt,
860 struct mif6ctl *vifc, int mrtsock)
862 int vifi = vifc->mif6c_mifi;
863 struct vif_device *v = &mrt->vif_table[vifi];
864 struct net_device *dev;
865 struct inet6_dev *in6_dev;
869 if (VIF_EXISTS(mrt, vifi))
872 switch (vifc->mif6c_flags) {
873 #ifdef CONFIG_IPV6_PIMSM_V2
876 * Special Purpose VIF in PIM
877 * All the packets will be sent to the daemon
879 if (mrt->mroute_reg_vif_num >= 0)
881 dev = ip6mr_reg_vif(net, mrt);
884 err = dev_set_allmulti(dev, 1);
886 unregister_netdevice(dev);
893 dev = dev_get_by_index(net, vifc->mif6c_pifi);
895 return -EADDRNOTAVAIL;
896 err = dev_set_allmulti(dev, 1);
906 in6_dev = __in6_dev_get(dev);
908 in6_dev->cnf.mc_forwarding++;
909 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
910 NETCONFA_MC_FORWARDING,
911 dev->ifindex, &in6_dev->cnf);
914 /* Fill in the VIF structures */
915 vif_device_init(v, dev, vifc->vifc_rate_limit, vifc->vifc_threshold,
916 vifc->mif6c_flags | (!mrtsock ? VIFF_STATIC : 0),
919 /* And finish update writing critical data */
920 write_lock_bh(&mrt_lock);
922 #ifdef CONFIG_IPV6_PIMSM_V2
923 if (v->flags & MIFF_REGISTER)
924 mrt->mroute_reg_vif_num = vifi;
926 if (vifi + 1 > mrt->maxvif)
927 mrt->maxvif = vifi + 1;
928 write_unlock_bh(&mrt_lock);
929 call_ip6mr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD,
934 static struct mfc6_cache *ip6mr_cache_find(struct mr_table *mrt,
935 const struct in6_addr *origin,
936 const struct in6_addr *mcastgrp)
938 struct mfc6_cache_cmp_arg arg = {
939 .mf6c_origin = *origin,
940 .mf6c_mcastgrp = *mcastgrp,
943 return mr_mfc_find(mrt, &arg);
946 /* Look for a (*,G) entry */
947 static struct mfc6_cache *ip6mr_cache_find_any(struct mr_table *mrt,
948 struct in6_addr *mcastgrp,
951 struct mfc6_cache_cmp_arg arg = {
952 .mf6c_origin = in6addr_any,
953 .mf6c_mcastgrp = *mcastgrp,
956 if (ipv6_addr_any(mcastgrp))
957 return mr_mfc_find_any_parent(mrt, mifi);
958 return mr_mfc_find_any(mrt, mifi, &arg);
961 /* Look for a (S,G,iif) entry if parent != -1 */
962 static struct mfc6_cache *
963 ip6mr_cache_find_parent(struct mr_table *mrt,
964 const struct in6_addr *origin,
965 const struct in6_addr *mcastgrp,
968 struct mfc6_cache_cmp_arg arg = {
969 .mf6c_origin = *origin,
970 .mf6c_mcastgrp = *mcastgrp,
973 return mr_mfc_find_parent(mrt, &arg, parent);
976 /* Allocate a multicast cache entry */
977 static struct mfc6_cache *ip6mr_cache_alloc(void)
979 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
982 c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1;
983 c->_c.mfc_un.res.minvif = MAXMIFS;
984 c->_c.free = ip6mr_cache_free_rcu;
985 refcount_set(&c->_c.mfc_un.res.refcount, 1);
989 static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
991 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
994 skb_queue_head_init(&c->_c.mfc_un.unres.unresolved);
995 c->_c.mfc_un.unres.expires = jiffies + 10 * HZ;
1000 * A cache entry has gone into a resolved state from queued
1003 static void ip6mr_cache_resolve(struct net *net, struct mr_table *mrt,
1004 struct mfc6_cache *uc, struct mfc6_cache *c)
1006 struct sk_buff *skb;
1009 * Play the pending entries through our router
1012 while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) {
1013 if (ipv6_hdr(skb)->version == 0) {
1014 struct nlmsghdr *nlh = skb_pull(skb,
1015 sizeof(struct ipv6hdr));
1017 if (mr_fill_mroute(mrt, skb, &c->_c,
1018 nlmsg_data(nlh)) > 0) {
1019 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
1021 nlh->nlmsg_type = NLMSG_ERROR;
1022 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
1023 skb_trim(skb, nlh->nlmsg_len);
1024 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
1026 rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
1028 ip6_mr_forward(net, mrt, skb->dev, skb, c);
1033 * Bounce a cache query up to pim6sd and netlink.
1035 * Called under mrt_lock.
1038 static int ip6mr_cache_report(struct mr_table *mrt, struct sk_buff *pkt,
1039 mifi_t mifi, int assert)
1041 struct sock *mroute6_sk;
1042 struct sk_buff *skb;
1043 struct mrt6msg *msg;
1046 #ifdef CONFIG_IPV6_PIMSM_V2
1047 if (assert == MRT6MSG_WHOLEPKT)
1048 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
1052 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
1057 /* I suppose that internal messages
1058 * do not require checksums */
1060 skb->ip_summed = CHECKSUM_UNNECESSARY;
1062 #ifdef CONFIG_IPV6_PIMSM_V2
1063 if (assert == MRT6MSG_WHOLEPKT) {
1064 /* Ugly, but we have no choice with this interface.
1065 Duplicate old header, fix length etc.
1066 And all this only to mangle msg->im6_msgtype and
1067 to set msg->im6_mbz to "mbz" :-)
1069 skb_push(skb, -skb_network_offset(pkt));
1071 skb_push(skb, sizeof(*msg));
1072 skb_reset_transport_header(skb);
1073 msg = (struct mrt6msg *)skb_transport_header(skb);
1075 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
1076 msg->im6_mif = mrt->mroute_reg_vif_num;
1078 msg->im6_src = ipv6_hdr(pkt)->saddr;
1079 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1081 skb->ip_summed = CHECKSUM_UNNECESSARY;
1086 * Copy the IP header
1089 skb_put(skb, sizeof(struct ipv6hdr));
1090 skb_reset_network_header(skb);
1091 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
1096 skb_put(skb, sizeof(*msg));
1097 skb_reset_transport_header(skb);
1098 msg = (struct mrt6msg *)skb_transport_header(skb);
1101 msg->im6_msgtype = assert;
1102 msg->im6_mif = mifi;
1104 msg->im6_src = ipv6_hdr(pkt)->saddr;
1105 msg->im6_dst = ipv6_hdr(pkt)->daddr;
1107 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
1108 skb->ip_summed = CHECKSUM_UNNECESSARY;
1112 mroute6_sk = rcu_dereference(mrt->mroute_sk);
1119 mrt6msg_netlink_event(mrt, skb);
1121 /* Deliver to user space multicast routing algorithms */
1122 ret = sock_queue_rcv_skb(mroute6_sk, skb);
1125 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
1132 /* Queue a packet for resolution. It gets locked cache entry! */
1133 static int ip6mr_cache_unresolved(struct mr_table *mrt, mifi_t mifi,
1134 struct sk_buff *skb, struct net_device *dev)
1136 struct mfc6_cache *c;
1140 spin_lock_bh(&mfc_unres_lock);
1141 list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) {
1142 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
1143 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
1151 * Create a new entry if allowable
1154 c = ip6mr_cache_alloc_unres();
1156 spin_unlock_bh(&mfc_unres_lock);
1162 /* Fill in the new cache entry */
1163 c->_c.mfc_parent = -1;
1164 c->mf6c_origin = ipv6_hdr(skb)->saddr;
1165 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
1168 * Reflect first query at pim6sd
1170 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
1172 /* If the report failed throw the cache entry
1175 spin_unlock_bh(&mfc_unres_lock);
1177 ip6mr_cache_free(c);
1182 atomic_inc(&mrt->cache_resolve_queue_len);
1183 list_add(&c->_c.list, &mrt->mfc_unres_queue);
1184 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1186 ipmr_do_expire_process(mrt);
1189 /* See if we can append the packet */
1190 if (c->_c.mfc_un.unres.unresolved.qlen > 3) {
1196 skb->skb_iif = dev->ifindex;
1198 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb);
1202 spin_unlock_bh(&mfc_unres_lock);
1207 * MFC6 cache manipulation by user space
1210 static int ip6mr_mfc_delete(struct mr_table *mrt, struct mf6cctl *mfc,
1213 struct mfc6_cache *c;
1215 /* The entries are added/deleted only under RTNL */
1217 c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr,
1218 &mfc->mf6cc_mcastgrp.sin6_addr, parent);
1222 rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ip6mr_rht_params);
1223 list_del_rcu(&c->_c.list);
1225 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
1226 FIB_EVENT_ENTRY_DEL, c, mrt->id);
1227 mr6_netlink_event(mrt, c, RTM_DELROUTE);
1228 mr_cache_put(&c->_c);
1232 static int ip6mr_device_event(struct notifier_block *this,
1233 unsigned long event, void *ptr)
1235 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1236 struct net *net = dev_net(dev);
1237 struct mr_table *mrt;
1238 struct vif_device *v;
1241 if (event != NETDEV_UNREGISTER)
1244 ip6mr_for_each_table(mrt, net) {
1245 v = &mrt->vif_table[0];
1246 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1248 mif6_delete(mrt, ct, 1, NULL);
1255 static unsigned int ip6mr_seq_read(struct net *net)
1259 return net->ipv6.ipmr_seq + ip6mr_rules_seq_read(net);
1262 static int ip6mr_dump(struct net *net, struct notifier_block *nb,
1263 struct netlink_ext_ack *extack)
1265 return mr_dump(net, nb, RTNL_FAMILY_IP6MR, ip6mr_rules_dump,
1266 ip6mr_mr_table_iter, &mrt_lock, extack);
1269 static struct notifier_block ip6_mr_notifier = {
1270 .notifier_call = ip6mr_device_event
1273 static const struct fib_notifier_ops ip6mr_notifier_ops_template = {
1274 .family = RTNL_FAMILY_IP6MR,
1275 .fib_seq_read = ip6mr_seq_read,
1276 .fib_dump = ip6mr_dump,
1277 .owner = THIS_MODULE,
1280 static int __net_init ip6mr_notifier_init(struct net *net)
1282 struct fib_notifier_ops *ops;
1284 net->ipv6.ipmr_seq = 0;
1286 ops = fib_notifier_ops_register(&ip6mr_notifier_ops_template, net);
1288 return PTR_ERR(ops);
1290 net->ipv6.ip6mr_notifier_ops = ops;
1295 static void __net_exit ip6mr_notifier_exit(struct net *net)
1297 fib_notifier_ops_unregister(net->ipv6.ip6mr_notifier_ops);
1298 net->ipv6.ip6mr_notifier_ops = NULL;
1301 /* Setup for IP multicast routing */
1302 static int __net_init ip6mr_net_init(struct net *net)
1306 err = ip6mr_notifier_init(net);
1310 err = ip6mr_rules_init(net);
1312 goto ip6mr_rules_fail;
1314 #ifdef CONFIG_PROC_FS
1316 if (!proc_create_net("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_seq_ops,
1317 sizeof(struct mr_vif_iter)))
1319 if (!proc_create_net("ip6_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops,
1320 sizeof(struct mr_mfc_iter)))
1321 goto proc_cache_fail;
1326 #ifdef CONFIG_PROC_FS
1328 remove_proc_entry("ip6_mr_vif", net->proc_net);
1330 ip6mr_rules_exit(net);
1333 ip6mr_notifier_exit(net);
1337 static void __net_exit ip6mr_net_exit(struct net *net)
1339 #ifdef CONFIG_PROC_FS
1340 remove_proc_entry("ip6_mr_cache", net->proc_net);
1341 remove_proc_entry("ip6_mr_vif", net->proc_net);
1343 ip6mr_rules_exit(net);
1344 ip6mr_notifier_exit(net);
1347 static struct pernet_operations ip6mr_net_ops = {
1348 .init = ip6mr_net_init,
1349 .exit = ip6mr_net_exit,
1352 int __init ip6_mr_init(void)
1356 mrt_cachep = kmem_cache_create("ip6_mrt_cache",
1357 sizeof(struct mfc6_cache),
1358 0, SLAB_HWCACHE_ALIGN,
1363 err = register_pernet_subsys(&ip6mr_net_ops);
1365 goto reg_pernet_fail;
1367 err = register_netdevice_notifier(&ip6_mr_notifier);
1369 goto reg_notif_fail;
1370 #ifdef CONFIG_IPV6_PIMSM_V2
1371 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1372 pr_err("%s: can't add PIM protocol\n", __func__);
1374 goto add_proto_fail;
1377 err = rtnl_register_module(THIS_MODULE, RTNL_FAMILY_IP6MR, RTM_GETROUTE,
1378 NULL, ip6mr_rtm_dumproute, 0);
1382 #ifdef CONFIG_IPV6_PIMSM_V2
1383 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
1385 unregister_netdevice_notifier(&ip6_mr_notifier);
1388 unregister_pernet_subsys(&ip6mr_net_ops);
1390 kmem_cache_destroy(mrt_cachep);
1394 void ip6_mr_cleanup(void)
1396 rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE);
1397 #ifdef CONFIG_IPV6_PIMSM_V2
1398 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
1400 unregister_netdevice_notifier(&ip6_mr_notifier);
1401 unregister_pernet_subsys(&ip6mr_net_ops);
1402 kmem_cache_destroy(mrt_cachep);
1405 static int ip6mr_mfc_add(struct net *net, struct mr_table *mrt,
1406 struct mf6cctl *mfc, int mrtsock, int parent)
1408 unsigned char ttls[MAXMIFS];
1409 struct mfc6_cache *uc, *c;
1414 if (mfc->mf6cc_parent >= MAXMIFS)
1417 memset(ttls, 255, MAXMIFS);
1418 for (i = 0; i < MAXMIFS; i++) {
1419 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1423 /* The entries are added/deleted only under RTNL */
1425 c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr,
1426 &mfc->mf6cc_mcastgrp.sin6_addr, parent);
1429 write_lock_bh(&mrt_lock);
1430 c->_c.mfc_parent = mfc->mf6cc_parent;
1431 ip6mr_update_thresholds(mrt, &c->_c, ttls);
1433 c->_c.mfc_flags |= MFC_STATIC;
1434 write_unlock_bh(&mrt_lock);
1435 call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE,
1437 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1441 if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
1442 !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1445 c = ip6mr_cache_alloc();
1449 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1450 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1451 c->_c.mfc_parent = mfc->mf6cc_parent;
1452 ip6mr_update_thresholds(mrt, &c->_c, ttls);
1454 c->_c.mfc_flags |= MFC_STATIC;
1456 err = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode,
1459 pr_err("ip6mr: rhtable insert error %d\n", err);
1460 ip6mr_cache_free(c);
1463 list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list);
1465 /* Check to see if we resolved a queued list. If so we
1466 * need to send on the frames and tidy up.
1469 spin_lock_bh(&mfc_unres_lock);
1470 list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) {
1471 uc = (struct mfc6_cache *)_uc;
1472 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1473 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1474 list_del(&_uc->list);
1475 atomic_dec(&mrt->cache_resolve_queue_len);
1480 if (list_empty(&mrt->mfc_unres_queue))
1481 del_timer(&mrt->ipmr_expire_timer);
1482 spin_unlock_bh(&mfc_unres_lock);
1485 ip6mr_cache_resolve(net, mrt, uc, c);
1486 ip6mr_cache_free(uc);
1488 call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD,
1490 mr6_netlink_event(mrt, c, RTM_NEWROUTE);
1495 * Close the multicast socket, and clear the vif tables etc
1498 static void mroute_clean_tables(struct mr_table *mrt, int flags)
1500 struct mr_mfc *c, *tmp;
1504 /* Shut down all active vif entries */
1505 if (flags & (MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC)) {
1506 for (i = 0; i < mrt->maxvif; i++) {
1507 if (((mrt->vif_table[i].flags & VIFF_STATIC) &&
1508 !(flags & MRT6_FLUSH_MIFS_STATIC)) ||
1509 (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT6_FLUSH_MIFS)))
1511 mif6_delete(mrt, i, 0, &list);
1513 unregister_netdevice_many(&list);
1516 /* Wipe the cache */
1517 if (flags & (MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC)) {
1518 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
1519 if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC_STATIC)) ||
1520 (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC)))
1522 rhltable_remove(&mrt->mfc_hash, &c->mnode, ip6mr_rht_params);
1523 list_del_rcu(&c->list);
1524 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net),
1525 FIB_EVENT_ENTRY_DEL,
1526 (struct mfc6_cache *)c, mrt->id);
1527 mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE);
1532 if (flags & MRT6_FLUSH_MFC) {
1533 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1534 spin_lock_bh(&mfc_unres_lock);
1535 list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) {
1537 mr6_netlink_event(mrt, (struct mfc6_cache *)c,
1539 ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c);
1541 spin_unlock_bh(&mfc_unres_lock);
1546 static int ip6mr_sk_init(struct mr_table *mrt, struct sock *sk)
1549 struct net *net = sock_net(sk);
1552 write_lock_bh(&mrt_lock);
1553 if (rtnl_dereference(mrt->mroute_sk)) {
1556 rcu_assign_pointer(mrt->mroute_sk, sk);
1557 sock_set_flag(sk, SOCK_RCU_FREE);
1558 net->ipv6.devconf_all->mc_forwarding++;
1560 write_unlock_bh(&mrt_lock);
1563 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
1564 NETCONFA_MC_FORWARDING,
1565 NETCONFA_IFINDEX_ALL,
1566 net->ipv6.devconf_all);
1572 int ip6mr_sk_done(struct sock *sk)
1575 struct net *net = sock_net(sk);
1576 struct mr_table *mrt;
1578 if (sk->sk_type != SOCK_RAW ||
1579 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1583 ip6mr_for_each_table(mrt, net) {
1584 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1585 write_lock_bh(&mrt_lock);
1586 RCU_INIT_POINTER(mrt->mroute_sk, NULL);
1587 /* Note that mroute_sk had SOCK_RCU_FREE set,
1588 * so the RCU grace period before sk freeing
1589 * is guaranteed by sk_destruct()
1591 net->ipv6.devconf_all->mc_forwarding--;
1592 write_unlock_bh(&mrt_lock);
1593 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
1594 NETCONFA_MC_FORWARDING,
1595 NETCONFA_IFINDEX_ALL,
1596 net->ipv6.devconf_all);
1598 mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MFC);
1608 bool mroute6_is_socket(struct net *net, struct sk_buff *skb)
1610 struct mr_table *mrt;
1611 struct flowi6 fl6 = {
1612 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX,
1613 .flowi6_oif = skb->dev->ifindex,
1614 .flowi6_mark = skb->mark,
1617 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
1620 return rcu_access_pointer(mrt->mroute_sk);
1622 EXPORT_SYMBOL(mroute6_is_socket);
1625 * Socket options and virtual interface manipulation. The whole
1626 * virtual interface system is a complete heap, but unfortunately
1627 * that's how BSD mrouted happens to think. Maybe one day with a proper
1628 * MOSPF/PIM router set up we can clean this up.
1631 int ip6_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
1632 unsigned int optlen)
1634 int ret, parent = 0;
1638 struct net *net = sock_net(sk);
1639 struct mr_table *mrt;
1641 if (sk->sk_type != SOCK_RAW ||
1642 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1645 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1649 if (optname != MRT6_INIT) {
1650 if (sk != rcu_access_pointer(mrt->mroute_sk) &&
1651 !ns_capable(net->user_ns, CAP_NET_ADMIN))
1657 if (optlen < sizeof(int))
1660 return ip6mr_sk_init(mrt, sk);
1663 return ip6mr_sk_done(sk);
1666 if (optlen < sizeof(vif))
1668 if (copy_from_sockptr(&vif, optval, sizeof(vif)))
1670 if (vif.mif6c_mifi >= MAXMIFS)
1673 ret = mif6_add(net, mrt, &vif,
1674 sk == rtnl_dereference(mrt->mroute_sk));
1679 if (optlen < sizeof(mifi_t))
1681 if (copy_from_sockptr(&mifi, optval, sizeof(mifi_t)))
1684 ret = mif6_delete(mrt, mifi, 0, NULL);
1689 * Manipulate the forwarding caches. These live
1690 * in a sort of kernel/user symbiosis.
1696 case MRT6_ADD_MFC_PROXY:
1697 case MRT6_DEL_MFC_PROXY:
1698 if (optlen < sizeof(mfc))
1700 if (copy_from_sockptr(&mfc, optval, sizeof(mfc)))
1703 parent = mfc.mf6cc_parent;
1705 if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
1706 ret = ip6mr_mfc_delete(mrt, &mfc, parent);
1708 ret = ip6mr_mfc_add(net, mrt, &mfc,
1710 rtnl_dereference(mrt->mroute_sk),
1719 if (optlen != sizeof(flags))
1721 if (copy_from_sockptr(&flags, optval, sizeof(flags)))
1724 mroute_clean_tables(mrt, flags);
1730 * Control PIM assert (to activate pim will activate assert)
1736 if (optlen != sizeof(v))
1738 if (copy_from_sockptr(&v, optval, sizeof(v)))
1740 mrt->mroute_do_assert = v;
1744 #ifdef CONFIG_IPV6_PIMSM_V2
1749 if (optlen != sizeof(v))
1751 if (copy_from_sockptr(&v, optval, sizeof(v)))
1756 if (v != mrt->mroute_do_pim) {
1757 mrt->mroute_do_pim = v;
1758 mrt->mroute_do_assert = v;
1765 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
1770 if (optlen != sizeof(u32))
1772 if (copy_from_sockptr(&v, optval, sizeof(v)))
1774 /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
1775 if (v != RT_TABLE_DEFAULT && v >= 100000000)
1777 if (sk == rcu_access_pointer(mrt->mroute_sk))
1782 mrt = ip6mr_new_table(net, v);
1786 raw6_sk(sk)->ip6mr_table = v;
1792 * Spurious command, or MRT6_VERSION which you cannot
1796 return -ENOPROTOOPT;
1801 * Getsock opt support for the multicast routing system.
1804 int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1809 struct net *net = sock_net(sk);
1810 struct mr_table *mrt;
1812 if (sk->sk_type != SOCK_RAW ||
1813 inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1816 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1824 #ifdef CONFIG_IPV6_PIMSM_V2
1826 val = mrt->mroute_do_pim;
1830 val = mrt->mroute_do_assert;
1833 return -ENOPROTOOPT;
1836 if (get_user(olr, optlen))
1839 olr = min_t(int, olr, sizeof(int));
1843 if (put_user(olr, optlen))
1845 if (copy_to_user(optval, &val, olr))
1851 * The IP multicast ioctl support routines.
1854 int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1856 struct sioc_sg_req6 sr;
1857 struct sioc_mif_req6 vr;
1858 struct vif_device *vif;
1859 struct mfc6_cache *c;
1860 struct net *net = sock_net(sk);
1861 struct mr_table *mrt;
1863 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1868 case SIOCGETMIFCNT_IN6:
1869 if (copy_from_user(&vr, arg, sizeof(vr)))
1871 if (vr.mifi >= mrt->maxvif)
1873 vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif);
1874 read_lock(&mrt_lock);
1875 vif = &mrt->vif_table[vr.mifi];
1876 if (VIF_EXISTS(mrt, vr.mifi)) {
1877 vr.icount = vif->pkt_in;
1878 vr.ocount = vif->pkt_out;
1879 vr.ibytes = vif->bytes_in;
1880 vr.obytes = vif->bytes_out;
1881 read_unlock(&mrt_lock);
1883 if (copy_to_user(arg, &vr, sizeof(vr)))
1887 read_unlock(&mrt_lock);
1888 return -EADDRNOTAVAIL;
1889 case SIOCGETSGCNT_IN6:
1890 if (copy_from_user(&sr, arg, sizeof(sr)))
1894 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1896 sr.pktcnt = c->_c.mfc_un.res.pkt;
1897 sr.bytecnt = c->_c.mfc_un.res.bytes;
1898 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1901 if (copy_to_user(arg, &sr, sizeof(sr)))
1906 return -EADDRNOTAVAIL;
1908 return -ENOIOCTLCMD;
1912 #ifdef CONFIG_COMPAT
1913 struct compat_sioc_sg_req6 {
1914 struct sockaddr_in6 src;
1915 struct sockaddr_in6 grp;
1916 compat_ulong_t pktcnt;
1917 compat_ulong_t bytecnt;
1918 compat_ulong_t wrong_if;
1921 struct compat_sioc_mif_req6 {
1923 compat_ulong_t icount;
1924 compat_ulong_t ocount;
1925 compat_ulong_t ibytes;
1926 compat_ulong_t obytes;
1929 int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1931 struct compat_sioc_sg_req6 sr;
1932 struct compat_sioc_mif_req6 vr;
1933 struct vif_device *vif;
1934 struct mfc6_cache *c;
1935 struct net *net = sock_net(sk);
1936 struct mr_table *mrt;
1938 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
1943 case SIOCGETMIFCNT_IN6:
1944 if (copy_from_user(&vr, arg, sizeof(vr)))
1946 if (vr.mifi >= mrt->maxvif)
1948 vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif);
1949 read_lock(&mrt_lock);
1950 vif = &mrt->vif_table[vr.mifi];
1951 if (VIF_EXISTS(mrt, vr.mifi)) {
1952 vr.icount = vif->pkt_in;
1953 vr.ocount = vif->pkt_out;
1954 vr.ibytes = vif->bytes_in;
1955 vr.obytes = vif->bytes_out;
1956 read_unlock(&mrt_lock);
1958 if (copy_to_user(arg, &vr, sizeof(vr)))
1962 read_unlock(&mrt_lock);
1963 return -EADDRNOTAVAIL;
1964 case SIOCGETSGCNT_IN6:
1965 if (copy_from_user(&sr, arg, sizeof(sr)))
1969 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1971 sr.pktcnt = c->_c.mfc_un.res.pkt;
1972 sr.bytecnt = c->_c.mfc_un.res.bytes;
1973 sr.wrong_if = c->_c.mfc_un.res.wrong_if;
1976 if (copy_to_user(arg, &sr, sizeof(sr)))
1981 return -EADDRNOTAVAIL;
1983 return -ENOIOCTLCMD;
1988 static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
1990 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
1991 IPSTATS_MIB_OUTFORWDATAGRAMS);
1992 IP6_ADD_STATS(net, ip6_dst_idev(skb_dst(skb)),
1993 IPSTATS_MIB_OUTOCTETS, skb->len);
1994 return dst_output(net, sk, skb);
1998 * Processing handlers for ip6mr_forward
2001 static int ip6mr_forward2(struct net *net, struct mr_table *mrt,
2002 struct sk_buff *skb, int vifi)
2004 struct ipv6hdr *ipv6h;
2005 struct vif_device *vif = &mrt->vif_table[vifi];
2006 struct net_device *dev;
2007 struct dst_entry *dst;
2013 #ifdef CONFIG_IPV6_PIMSM_V2
2014 if (vif->flags & MIFF_REGISTER) {
2016 vif->bytes_out += skb->len;
2017 vif->dev->stats.tx_bytes += skb->len;
2018 vif->dev->stats.tx_packets++;
2019 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
2024 ipv6h = ipv6_hdr(skb);
2026 fl6 = (struct flowi6) {
2027 .flowi6_oif = vif->link,
2028 .daddr = ipv6h->daddr,
2031 dst = ip6_route_output(net, NULL, &fl6);
2038 skb_dst_set(skb, dst);
2041 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
2042 * not only before forwarding, but after forwarding on all output
2043 * interfaces. It is clear, if mrouter runs a multicasting
2044 * program, it should receive packets not depending to what interface
2045 * program is joined.
2046 * If we will not make it, the program will have to join on all
2047 * interfaces. On the other hand, multihoming host (or router, but
2048 * not mrouter) cannot join to more than one interface - it will
2049 * result in receiving multiple packets.
2054 vif->bytes_out += skb->len;
2056 /* We are about to write */
2057 /* XXX: extension headers? */
2058 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
2061 ipv6h = ipv6_hdr(skb);
2064 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
2066 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD,
2067 net, NULL, skb, skb->dev, dev,
2068 ip6mr_forward2_finish);
2075 static int ip6mr_find_vif(struct mr_table *mrt, struct net_device *dev)
2079 for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
2080 if (mrt->vif_table[ct].dev == dev)
2086 static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
2087 struct net_device *dev, struct sk_buff *skb,
2088 struct mfc6_cache *c)
2092 int true_vifi = ip6mr_find_vif(mrt, dev);
2094 vif = c->_c.mfc_parent;
2095 c->_c.mfc_un.res.pkt++;
2096 c->_c.mfc_un.res.bytes += skb->len;
2097 c->_c.mfc_un.res.lastuse = jiffies;
2099 if (ipv6_addr_any(&c->mf6c_origin) && true_vifi >= 0) {
2100 struct mfc6_cache *cache_proxy;
2102 /* For an (*,G) entry, we only check that the incoming
2103 * interface is part of the static tree.
2106 cache_proxy = mr_mfc_find_any_parent(mrt, vif);
2108 cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255) {
2116 * Wrong interface: drop packet and (maybe) send PIM assert.
2118 if (mrt->vif_table[vif].dev != dev) {
2119 c->_c.mfc_un.res.wrong_if++;
2121 if (true_vifi >= 0 && mrt->mroute_do_assert &&
2122 /* pimsm uses asserts, when switching from RPT to SPT,
2123 so that we cannot check that packet arrived on an oif.
2124 It is bad, but otherwise we would need to move pretty
2125 large chunk of pimd to kernel. Ough... --ANK
2127 (mrt->mroute_do_pim ||
2128 c->_c.mfc_un.res.ttls[true_vifi] < 255) &&
2130 c->_c.mfc_un.res.last_assert +
2131 MFC_ASSERT_THRESH)) {
2132 c->_c.mfc_un.res.last_assert = jiffies;
2133 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
2139 mrt->vif_table[vif].pkt_in++;
2140 mrt->vif_table[vif].bytes_in += skb->len;
2145 if (ipv6_addr_any(&c->mf6c_origin) &&
2146 ipv6_addr_any(&c->mf6c_mcastgrp)) {
2147 if (true_vifi >= 0 &&
2148 true_vifi != c->_c.mfc_parent &&
2149 ipv6_hdr(skb)->hop_limit >
2150 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) {
2151 /* It's an (*,*) entry and the packet is not coming from
2152 * the upstream: forward the packet to the upstream
2155 psend = c->_c.mfc_parent;
2160 for (ct = c->_c.mfc_un.res.maxvif - 1;
2161 ct >= c->_c.mfc_un.res.minvif; ct--) {
2162 /* For (*,G) entry, don't forward to the incoming interface */
2163 if ((!ipv6_addr_any(&c->mf6c_origin) || ct != true_vifi) &&
2164 ipv6_hdr(skb)->hop_limit > c->_c.mfc_un.res.ttls[ct]) {
2166 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
2168 ip6mr_forward2(net, mrt, skb2, psend);
2175 ip6mr_forward2(net, mrt, skb, psend);
2185 * Multicast packets for forwarding arrive here
2188 int ip6_mr_input(struct sk_buff *skb)
2190 struct mfc6_cache *cache;
2191 struct net *net = dev_net(skb->dev);
2192 struct mr_table *mrt;
2193 struct flowi6 fl6 = {
2194 .flowi6_iif = skb->dev->ifindex,
2195 .flowi6_mark = skb->mark,
2198 struct net_device *dev;
2200 /* skb->dev passed in is the master dev for vrfs.
2201 * Get the proper interface that does have a vif associated with it.
2204 if (netif_is_l3_master(skb->dev)) {
2205 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
2212 err = ip6mr_fib_lookup(net, &fl6, &mrt);
2218 read_lock(&mrt_lock);
2219 cache = ip6mr_cache_find(mrt,
2220 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
2222 int vif = ip6mr_find_vif(mrt, dev);
2225 cache = ip6mr_cache_find_any(mrt,
2226 &ipv6_hdr(skb)->daddr,
2231 * No usable cache entry
2236 vif = ip6mr_find_vif(mrt, dev);
2238 int err = ip6mr_cache_unresolved(mrt, vif, skb, dev);
2239 read_unlock(&mrt_lock);
2243 read_unlock(&mrt_lock);
2248 ip6_mr_forward(net, mrt, dev, skb, cache);
2250 read_unlock(&mrt_lock);
2255 int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm,
2259 struct mr_table *mrt;
2260 struct mfc6_cache *cache;
2261 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
2263 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
2267 read_lock(&mrt_lock);
2268 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
2269 if (!cache && skb->dev) {
2270 int vif = ip6mr_find_vif(mrt, skb->dev);
2273 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
2278 struct sk_buff *skb2;
2279 struct ipv6hdr *iph;
2280 struct net_device *dev;
2284 if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
2285 read_unlock(&mrt_lock);
2289 /* really correct? */
2290 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
2292 read_unlock(&mrt_lock);
2296 NETLINK_CB(skb2).portid = portid;
2297 skb_reset_transport_header(skb2);
2299 skb_put(skb2, sizeof(struct ipv6hdr));
2300 skb_reset_network_header(skb2);
2302 iph = ipv6_hdr(skb2);
2305 iph->flow_lbl[0] = 0;
2306 iph->flow_lbl[1] = 0;
2307 iph->flow_lbl[2] = 0;
2308 iph->payload_len = 0;
2309 iph->nexthdr = IPPROTO_NONE;
2311 iph->saddr = rt->rt6i_src.addr;
2312 iph->daddr = rt->rt6i_dst.addr;
2314 err = ip6mr_cache_unresolved(mrt, vif, skb2, dev);
2315 read_unlock(&mrt_lock);
2320 err = mr_fill_mroute(mrt, skb, &cache->_c, rtm);
2321 read_unlock(&mrt_lock);
2325 static int ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2326 u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
2329 struct nlmsghdr *nlh;
2333 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
2337 rtm = nlmsg_data(nlh);
2338 rtm->rtm_family = RTNL_FAMILY_IP6MR;
2339 rtm->rtm_dst_len = 128;
2340 rtm->rtm_src_len = 128;
2342 rtm->rtm_table = mrt->id;
2343 if (nla_put_u32(skb, RTA_TABLE, mrt->id))
2344 goto nla_put_failure;
2345 rtm->rtm_type = RTN_MULTICAST;
2346 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2347 if (c->_c.mfc_flags & MFC_STATIC)
2348 rtm->rtm_protocol = RTPROT_STATIC;
2350 rtm->rtm_protocol = RTPROT_MROUTED;
2353 if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) ||
2354 nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp))
2355 goto nla_put_failure;
2356 err = mr_fill_mroute(mrt, skb, &c->_c, rtm);
2357 /* do not break the dump if cache is unresolved */
2358 if (err < 0 && err != -ENOENT)
2359 goto nla_put_failure;
2361 nlmsg_end(skb, nlh);
2365 nlmsg_cancel(skb, nlh);
2369 static int _ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2370 u32 portid, u32 seq, struct mr_mfc *c,
2373 return ip6mr_fill_mroute(mrt, skb, portid, seq, (struct mfc6_cache *)c,
2377 static int mr6_msgsize(bool unresolved, int maxvif)
2380 NLMSG_ALIGN(sizeof(struct rtmsg))
2381 + nla_total_size(4) /* RTA_TABLE */
2382 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */
2383 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */
2388 + nla_total_size(4) /* RTA_IIF */
2389 + nla_total_size(0) /* RTA_MULTIPATH */
2390 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
2392 + nla_total_size_64bit(sizeof(struct rta_mfc_stats))
2398 static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
2401 struct net *net = read_pnet(&mrt->net);
2402 struct sk_buff *skb;
2405 skb = nlmsg_new(mr6_msgsize(mfc->_c.mfc_parent >= MAXMIFS, mrt->maxvif),
2410 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
2414 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
2420 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
2423 static size_t mrt6msg_netlink_msgsize(size_t payloadlen)
2426 NLMSG_ALIGN(sizeof(struct rtgenmsg))
2427 + nla_total_size(1) /* IP6MRA_CREPORT_MSGTYPE */
2428 + nla_total_size(4) /* IP6MRA_CREPORT_MIF_ID */
2429 /* IP6MRA_CREPORT_SRC_ADDR */
2430 + nla_total_size(sizeof(struct in6_addr))
2431 /* IP6MRA_CREPORT_DST_ADDR */
2432 + nla_total_size(sizeof(struct in6_addr))
2433 /* IP6MRA_CREPORT_PKT */
2434 + nla_total_size(payloadlen)
2440 static void mrt6msg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt)
2442 struct net *net = read_pnet(&mrt->net);
2443 struct nlmsghdr *nlh;
2444 struct rtgenmsg *rtgenm;
2445 struct mrt6msg *msg;
2446 struct sk_buff *skb;
2450 payloadlen = pkt->len - sizeof(struct mrt6msg);
2451 msg = (struct mrt6msg *)skb_transport_header(pkt);
2453 skb = nlmsg_new(mrt6msg_netlink_msgsize(payloadlen), GFP_ATOMIC);
2457 nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT,
2458 sizeof(struct rtgenmsg), 0);
2461 rtgenm = nlmsg_data(nlh);
2462 rtgenm->rtgen_family = RTNL_FAMILY_IP6MR;
2463 if (nla_put_u8(skb, IP6MRA_CREPORT_MSGTYPE, msg->im6_msgtype) ||
2464 nla_put_u32(skb, IP6MRA_CREPORT_MIF_ID, msg->im6_mif) ||
2465 nla_put_in6_addr(skb, IP6MRA_CREPORT_SRC_ADDR,
2467 nla_put_in6_addr(skb, IP6MRA_CREPORT_DST_ADDR,
2469 goto nla_put_failure;
2471 nla = nla_reserve(skb, IP6MRA_CREPORT_PKT, payloadlen);
2472 if (!nla || skb_copy_bits(pkt, sizeof(struct mrt6msg),
2473 nla_data(nla), payloadlen))
2474 goto nla_put_failure;
2476 nlmsg_end(skb, nlh);
2478 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE_R, NULL, GFP_ATOMIC);
2482 nlmsg_cancel(skb, nlh);
2485 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE_R, -ENOBUFS);
2488 static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2490 const struct nlmsghdr *nlh = cb->nlh;
2491 struct fib_dump_filter filter = {};
2494 if (cb->strict_check) {
2495 err = ip_valid_fib_dump_req(sock_net(skb->sk), nlh,
2501 if (filter.table_id) {
2502 struct mr_table *mrt;
2504 mrt = ip6mr_get_table(sock_net(skb->sk), filter.table_id);
2506 if (rtnl_msg_family(cb->nlh) != RTNL_FAMILY_IP6MR)
2509 NL_SET_ERR_MSG_MOD(cb->extack, "MR table does not exist");
2512 err = mr_table_dump(mrt, skb, cb, _ip6mr_fill_mroute,
2513 &mfc_unres_lock, &filter);
2514 return skb->len ? : err;
2517 return mr_rtm_dumproute(skb, cb, ip6mr_mr_table_iter,
2518 _ip6mr_fill_mroute, &mfc_unres_lock, &filter);