1 /* net/tipc/udp_media.c: IP bearer support for TIPC
3 * Copyright (c) 2015, Ericsson AB
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the names of the copyright holders nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
18 * Alternatively, this software may be distributed under the terms of the
19 * GNU General Public License ("GPL") version 2 as published by the Free
20 * Software Foundation.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
35 #include <linux/socket.h>
37 #include <linux/udp.h>
38 #include <linux/inet.h>
39 #include <linux/inetdevice.h>
40 #include <linux/igmp.h>
41 #include <linux/kernel.h>
42 #include <linux/workqueue.h>
43 #include <linux/list.h>
46 #include <net/udp_tunnel.h>
47 #include <net/ipv6_stubs.h>
48 #include <linux/tipc_netlink.h>
55 #include "udp_media.h"
57 /* IANA assigned UDP port */
58 #define UDP_PORT_DEFAULT 6118
60 #define UDP_MIN_HEADROOM 48
63 * struct udp_media_addr - IP/UDP addressing information
65 * This is the bearer level originating address used in neighbor discovery
66 * messages, and all fields should be in network byte order
68 * @proto: Ethernet protocol in use
69 * @port: port being used
70 * @ipv4: IPv4 address of neighbor
71 * @ipv6: IPv6 address of neighbor
73 struct udp_media_addr {
82 /* struct udp_replicast - container for UDP remote addresses */
83 struct udp_replicast {
84 struct udp_media_addr addr;
85 struct dst_cache dst_cache;
87 struct list_head list;
91 * struct udp_bearer - ip/udp bearer data structure
92 * @bearer: associated generic tipc bearer
93 * @ubsock: bearer associated socket
94 * @ifindex: local address scope
95 * @work: used to schedule deferred work on a bearer
96 * @rcast: associated udp_replicast container
99 struct tipc_bearer __rcu *bearer;
100 struct socket *ubsock;
102 struct work_struct work;
103 struct udp_replicast rcast;
106 static int tipc_udp_is_mcast_addr(struct udp_media_addr *addr)
108 if (ntohs(addr->proto) == ETH_P_IP)
109 return ipv4_is_multicast(addr->ipv4.s_addr);
110 #if IS_ENABLED(CONFIG_IPV6)
112 return ipv6_addr_is_multicast(&addr->ipv6);
117 /* udp_media_addr_set - convert a ip/udp address to a TIPC media address */
118 static void tipc_udp_media_addr_set(struct tipc_media_addr *addr,
119 struct udp_media_addr *ua)
121 memset(addr, 0, sizeof(struct tipc_media_addr));
122 addr->media_id = TIPC_MEDIA_TYPE_UDP;
123 memcpy(addr->value, ua, sizeof(struct udp_media_addr));
125 if (tipc_udp_is_mcast_addr(ua))
126 addr->broadcast = TIPC_BROADCAST_SUPPORT;
129 /* tipc_udp_addr2str - convert ip/udp address to string */
130 static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size)
132 struct udp_media_addr *ua = (struct udp_media_addr *)&a->value;
134 if (ntohs(ua->proto) == ETH_P_IP)
135 snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port));
136 else if (ntohs(ua->proto) == ETH_P_IPV6)
137 snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port));
139 pr_err("Invalid UDP media address\n");
143 /* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */
144 static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a,
147 struct udp_media_addr *ua;
149 ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET);
150 if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP)
152 tipc_udp_media_addr_set(a, ua);
156 /* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */
157 static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a)
159 memset(msg, 0, TIPC_MEDIA_INFO_SIZE);
160 msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP;
161 memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value,
162 sizeof(struct udp_media_addr));
166 /* tipc_send_msg - enqueue a send request */
167 static int tipc_udp_xmit(struct net *net, struct sk_buff *skb,
168 struct udp_bearer *ub, struct udp_media_addr *src,
169 struct udp_media_addr *dst, struct dst_cache *cache)
171 struct dst_entry *ndst;
175 ndst = dst_cache_get(cache);
176 if (dst->proto == htons(ETH_P_IP)) {
177 struct rtable *rt = (struct rtable *)ndst;
181 .daddr = dst->ipv4.s_addr,
182 .saddr = src->ipv4.s_addr,
183 .flowi4_mark = skb->mark,
184 .flowi4_proto = IPPROTO_UDP
186 rt = ip_route_output_key(net, &fl);
191 dst_cache_set_ip4(cache, &rt->dst, fl.saddr);
194 ttl = ip4_dst_hoplimit(&rt->dst);
195 udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr,
196 dst->ipv4.s_addr, 0, ttl, 0, src->port,
197 dst->port, false, true);
198 #if IS_ENABLED(CONFIG_IPV6)
201 struct flowi6 fl6 = {
202 .flowi6_oif = ub->ifindex,
205 .flowi6_proto = IPPROTO_UDP
207 ndst = ipv6_stub->ipv6_dst_lookup_flow(net,
214 dst_cache_set_ip6(cache, ndst, &fl6.saddr);
216 ttl = ip6_dst_hoplimit(ndst);
217 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, NULL,
218 &src->ipv6, &dst->ipv6, 0, ttl, 0,
219 src->port, dst->port, false);
231 static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
232 struct tipc_bearer *b,
233 struct tipc_media_addr *addr)
235 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
236 struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value;
237 struct udp_replicast *rcast;
238 struct udp_bearer *ub;
241 if (skb_headroom(skb) < UDP_MIN_HEADROOM) {
242 err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC);
247 skb_set_inner_protocol(skb, htons(ETH_P_TIPC));
248 ub = rcu_dereference(b->media_ptr);
254 if (addr->broadcast != TIPC_REPLICAST_SUPPORT)
255 return tipc_udp_xmit(net, skb, ub, src, dst,
256 &ub->rcast.dst_cache);
258 /* Replicast, send an skb to each configured IP address */
259 list_for_each_entry_rcu(rcast, &ub->rcast.list, list) {
260 struct sk_buff *_skb;
262 _skb = pskb_copy(skb, GFP_ATOMIC);
268 err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr,
279 static bool tipc_udp_is_known_peer(struct tipc_bearer *b,
280 struct udp_media_addr *addr)
282 struct udp_replicast *rcast, *tmp;
283 struct udp_bearer *ub;
285 ub = rcu_dereference_rtnl(b->media_ptr);
287 pr_err_ratelimited("UDP bearer instance not found\n");
291 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
292 if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr)))
299 static int tipc_udp_rcast_add(struct tipc_bearer *b,
300 struct udp_media_addr *addr)
302 struct udp_replicast *rcast;
303 struct udp_bearer *ub;
305 ub = rcu_dereference_rtnl(b->media_ptr);
309 rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC);
313 if (dst_cache_init(&rcast->dst_cache, GFP_ATOMIC)) {
318 memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr));
320 if (ntohs(addr->proto) == ETH_P_IP)
321 pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4);
322 #if IS_ENABLED(CONFIG_IPV6)
323 else if (ntohs(addr->proto) == ETH_P_IPV6)
324 pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6);
326 b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT;
327 list_add_rcu(&rcast->list, &ub->rcast.list);
331 static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb)
333 struct udp_media_addr src = {0};
334 struct udp_media_addr *dst;
336 dst = (struct udp_media_addr *)&b->bcast_addr.value;
337 if (tipc_udp_is_mcast_addr(dst))
340 src.port = udp_hdr(skb)->source;
342 if (ip_hdr(skb)->version == 4) {
343 struct iphdr *iphdr = ip_hdr(skb);
345 src.proto = htons(ETH_P_IP);
346 src.ipv4.s_addr = iphdr->saddr;
347 if (ipv4_is_multicast(iphdr->daddr))
349 #if IS_ENABLED(CONFIG_IPV6)
350 } else if (ip_hdr(skb)->version == 6) {
351 struct ipv6hdr *iphdr = ipv6_hdr(skb);
353 src.proto = htons(ETH_P_IPV6);
354 src.ipv6 = iphdr->saddr;
355 if (ipv6_addr_is_multicast(&iphdr->daddr))
362 if (likely(tipc_udp_is_known_peer(b, &src)))
365 return tipc_udp_rcast_add(b, &src);
368 /* tipc_udp_recv - read data from bearer socket */
369 static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb)
371 struct udp_bearer *ub;
372 struct tipc_bearer *b;
373 struct tipc_msg *hdr;
376 ub = rcu_dereference_sk_user_data(sk);
378 pr_err_ratelimited("Failed to get UDP bearer reference");
381 skb_pull(skb, sizeof(struct udphdr));
384 b = rcu_dereference(ub->bearer);
388 if (b && test_bit(0, &b->up)) {
389 TIPC_SKB_CB(skb)->flags = 0;
390 tipc_rcv(sock_net(sk), skb, b);
394 if (unlikely(msg_user(hdr) == LINK_CONFIG)) {
395 err = tipc_udp_rcast_disc(b, skb);
405 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
408 struct ip_mreqn mreqn;
409 struct sock *sk = ub->ubsock->sk;
411 if (ntohs(remote->proto) == ETH_P_IP) {
412 mreqn.imr_multiaddr = remote->ipv4;
413 mreqn.imr_ifindex = ub->ifindex;
414 err = ip_mc_join_group(sk, &mreqn);
415 #if IS_ENABLED(CONFIG_IPV6)
418 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex,
426 static int __tipc_nl_add_udp_addr(struct sk_buff *skb,
427 struct udp_media_addr *addr, int nla_t)
429 if (ntohs(addr->proto) == ETH_P_IP) {
430 struct sockaddr_in ip4;
432 memset(&ip4, 0, sizeof(ip4));
433 ip4.sin_family = AF_INET;
434 ip4.sin_port = addr->port;
435 ip4.sin_addr.s_addr = addr->ipv4.s_addr;
436 if (nla_put(skb, nla_t, sizeof(ip4), &ip4))
439 #if IS_ENABLED(CONFIG_IPV6)
440 } else if (ntohs(addr->proto) == ETH_P_IPV6) {
441 struct sockaddr_in6 ip6;
443 memset(&ip6, 0, sizeof(ip6));
444 ip6.sin6_family = AF_INET6;
445 ip6.sin6_port = addr->port;
446 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr));
447 if (nla_put(skb, nla_t, sizeof(ip6), &ip6))
455 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb)
457 u32 bid = cb->args[0];
458 u32 skip_cnt = cb->args[1];
459 u32 portid = NETLINK_CB(cb->skb).portid;
460 struct udp_replicast *rcast, *tmp;
461 struct tipc_bearer *b;
462 struct udp_bearer *ub;
467 if (!bid && !skip_cnt) {
468 struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
469 struct net *net = sock_net(skb->sk);
470 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1];
473 if (!attrs[TIPC_NLA_BEARER])
476 err = nla_parse_nested_deprecated(battrs, TIPC_NLA_BEARER_MAX,
477 attrs[TIPC_NLA_BEARER],
478 tipc_nl_bearer_policy, NULL);
482 if (!battrs[TIPC_NLA_BEARER_NAME])
485 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]);
488 b = tipc_bearer_find(net, bname);
495 struct net *net = sock_net(skb->sk);
496 struct tipc_net *tn = net_generic(net, tipc_net_id);
499 b = rtnl_dereference(tn->bearer_list[bid]);
506 ub = rtnl_dereference(b->media_ptr);
513 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
517 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq,
518 &tipc_genl_family, NLM_F_MULTI,
523 err = __tipc_nl_add_udp_addr(skb, &rcast->addr,
524 TIPC_NLA_UDP_REMOTE);
526 genlmsg_cancel(skb, hdr);
529 genlmsg_end(skb, hdr);
541 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b)
543 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
544 struct udp_media_addr *dst;
545 struct udp_bearer *ub;
548 ub = rtnl_dereference(b->media_ptr);
552 nest = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_UDP_OPTS);
556 if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL))
559 dst = (struct udp_media_addr *)&b->bcast_addr.value;
560 if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE))
563 if (!list_empty(&ub->rcast.list)) {
564 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP))
568 nla_nest_end(msg->skb, nest);
571 nla_nest_cancel(msg->skb, nest);
576 * tipc_parse_udp_addr - build udp media address from netlink data
577 * @nla: netlink attribute containing sockaddr storage aligned address
578 * @addr: tipc media address to fill with address, port and protocol type
579 * @scope_id: IPv6 scope id pointer, not NULL indicates it's required
582 static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr,
585 struct sockaddr_storage sa;
587 nla_memcpy(&sa, nla, sizeof(sa));
588 if (sa.ss_family == AF_INET) {
589 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa;
591 addr->proto = htons(ETH_P_IP);
592 addr->port = ip4->sin_port;
593 addr->ipv4.s_addr = ip4->sin_addr.s_addr;
596 #if IS_ENABLED(CONFIG_IPV6)
597 } else if (sa.ss_family == AF_INET6) {
598 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa;
600 addr->proto = htons(ETH_P_IPV6);
601 addr->port = ip6->sin6_port;
602 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr));
604 /* Scope ID is only interesting for local addresses */
608 atype = ipv6_addr_type(&ip6->sin6_addr);
609 if (__ipv6_addr_needs_scope_id(atype) &&
610 !ip6->sin6_scope_id) {
614 *scope_id = ip6->sin6_scope_id ? : 0;
620 return -EADDRNOTAVAIL;
623 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr)
626 struct udp_media_addr addr = {0};
627 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
628 struct udp_media_addr *dst;
630 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy, NULL))
633 if (!opts[TIPC_NLA_UDP_REMOTE])
636 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL);
640 dst = (struct udp_media_addr *)&b->bcast_addr.value;
641 if (tipc_udp_is_mcast_addr(dst)) {
642 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n");
646 if (tipc_udp_is_known_peer(b, &addr))
649 return tipc_udp_rcast_add(b, &addr);
653 * tipc_udp_enable - callback to create a new udp bearer instance
654 * @net: network namespace
655 * @b: pointer to generic tipc_bearer
656 * @attrs: netlink bearer configuration
658 * validate the bearer parameters and initialize the udp bearer
659 * rtnl_lock should be held
661 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
662 struct nlattr *attrs[])
665 struct udp_bearer *ub;
666 struct udp_media_addr remote = {0};
667 struct udp_media_addr local = {0};
668 struct udp_port_cfg udp_conf = {0};
669 struct udp_tunnel_sock_cfg tuncfg = {NULL};
670 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
671 u8 node_id[NODE_ID_LEN] = {0,};
672 struct net_device *dev;
675 ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
679 INIT_LIST_HEAD(&ub->rcast.list);
681 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS])
684 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attrs[TIPC_NLA_BEARER_UDP_OPTS], tipc_nl_udp_policy, NULL))
687 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) {
688 pr_err("Invalid UDP bearer configuration");
693 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local,
698 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL);
702 if (remote.proto != local.proto) {
707 /* Checking remote ip address */
708 rmcast = tipc_udp_is_mcast_addr(&remote);
710 /* Autoconfigure own node identity if needed */
711 if (!tipc_own_id(net)) {
712 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16);
713 tipc_net_init(net, node_id, 0);
715 if (!tipc_own_id(net)) {
716 pr_warn("Failed to set node id, please configure manually\n");
721 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
722 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
723 rcu_assign_pointer(b->media_ptr, ub);
724 rcu_assign_pointer(ub->bearer, b);
725 tipc_udp_media_addr_set(&b->addr, &local);
726 if (local.proto == htons(ETH_P_IP)) {
727 dev = __ip_dev_find(net, local.ipv4.s_addr, false);
732 udp_conf.family = AF_INET;
734 /* Switch to use ANY to receive packets from group */
736 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
738 udp_conf.local_ip.s_addr = local.ipv4.s_addr;
739 udp_conf.use_udp_checksums = false;
740 ub->ifindex = dev->ifindex;
741 if (tipc_mtu_bad(dev, sizeof(struct iphdr) +
742 sizeof(struct udphdr))) {
746 b->mtu = b->media->mtu;
747 #if IS_ENABLED(CONFIG_IPV6)
748 } else if (local.proto == htons(ETH_P_IPV6)) {
749 dev = ub->ifindex ? __dev_get_by_index(net, ub->ifindex) : NULL;
750 dev = ipv6_dev_find(net, &local.ipv6, dev);
755 udp_conf.family = AF_INET6;
756 udp_conf.use_udp6_tx_checksums = true;
757 udp_conf.use_udp6_rx_checksums = true;
759 udp_conf.local_ip6 = in6addr_any;
761 udp_conf.local_ip6 = local.ipv6;
762 ub->ifindex = dev->ifindex;
769 udp_conf.local_udp_port = local.port;
770 err = udp_sock_create(net, &udp_conf, &ub->ubsock);
773 tuncfg.sk_user_data = ub;
774 tuncfg.encap_type = 1;
775 tuncfg.encap_rcv = tipc_udp_recv;
776 tuncfg.encap_destroy = NULL;
777 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);
779 err = dst_cache_init(&ub->rcast.dst_cache, GFP_ATOMIC);
784 * The bcast media address port is used for all peers and the ip
785 * is used if it's a multicast address.
787 memcpy(&b->bcast_addr.value, &remote, sizeof(remote));
789 err = enable_mcast(ub, &remote);
791 err = tipc_udp_rcast_add(b, &remote);
798 dst_cache_destroy(&ub->rcast.dst_cache);
799 udp_tunnel_sock_release(ub->ubsock);
805 /* cleanup_bearer - break the socket/bearer association */
806 static void cleanup_bearer(struct work_struct *work)
808 struct udp_bearer *ub = container_of(work, struct udp_bearer, work);
809 struct udp_replicast *rcast, *tmp;
811 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
812 dst_cache_destroy(&rcast->dst_cache);
813 list_del_rcu(&rcast->list);
814 kfree_rcu(rcast, rcu);
817 atomic_dec(&tipc_net(sock_net(ub->ubsock->sk))->wq_count);
818 dst_cache_destroy(&ub->rcast.dst_cache);
819 udp_tunnel_sock_release(ub->ubsock);
824 /* tipc_udp_disable - detach bearer from socket */
825 static void tipc_udp_disable(struct tipc_bearer *b)
827 struct udp_bearer *ub;
829 ub = rtnl_dereference(b->media_ptr);
831 pr_err("UDP bearer instance not found\n");
834 sock_set_flag(ub->ubsock->sk, SOCK_DEAD);
835 RCU_INIT_POINTER(ub->bearer, NULL);
837 /* sock_release need to be done outside of rtnl lock */
838 atomic_inc(&tipc_net(sock_net(ub->ubsock->sk))->wq_count);
839 INIT_WORK(&ub->work, cleanup_bearer);
840 schedule_work(&ub->work);
843 struct tipc_media udp_media_info = {
844 .send_msg = tipc_udp_send_msg,
845 .enable_media = tipc_udp_enable,
846 .disable_media = tipc_udp_disable,
847 .addr2str = tipc_udp_addr2str,
848 .addr2msg = tipc_udp_addr2msg,
849 .msg2addr = tipc_udp_msg2addr,
850 .priority = TIPC_DEF_LINK_PRI,
851 .tolerance = TIPC_DEF_LINK_TOL,
852 .min_win = TIPC_DEF_LINK_WIN,
853 .max_win = TIPC_DEF_LINK_WIN,
854 .mtu = TIPC_DEF_LINK_UDP_MTU,
855 .type_id = TIPC_MEDIA_TYPE_UDP,