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/addrconf.h>
48 #include <linux/tipc_netlink.h>
56 /* IANA assigned UDP port */
57 #define UDP_PORT_DEFAULT 6118
59 #define UDP_MIN_HEADROOM 48
62 * struct udp_media_addr - IP/UDP addressing information
64 * This is the bearer level originating address used in neighbor discovery
65 * messages, and all fields should be in network byte order
67 struct udp_media_addr {
76 /* struct udp_replicast - container for UDP remote addresses */
77 struct udp_replicast {
78 struct udp_media_addr addr;
80 struct list_head list;
84 * struct udp_bearer - ip/udp bearer data structure
85 * @bearer: associated generic tipc bearer
86 * @ubsock: bearer associated socket
87 * @ifindex: local address scope
88 * @work: used to schedule deferred work on a bearer
91 struct tipc_bearer __rcu *bearer;
92 struct socket *ubsock;
94 struct work_struct work;
95 struct udp_replicast rcast;
98 static int tipc_udp_is_mcast_addr(struct udp_media_addr *addr)
100 if (ntohs(addr->proto) == ETH_P_IP)
101 return ipv4_is_multicast(addr->ipv4.s_addr);
102 #if IS_ENABLED(CONFIG_IPV6)
104 return ipv6_addr_is_multicast(&addr->ipv6);
109 /* udp_media_addr_set - convert a ip/udp address to a TIPC media address */
110 static void tipc_udp_media_addr_set(struct tipc_media_addr *addr,
111 struct udp_media_addr *ua)
113 memset(addr, 0, sizeof(struct tipc_media_addr));
114 addr->media_id = TIPC_MEDIA_TYPE_UDP;
115 memcpy(addr->value, ua, sizeof(struct udp_media_addr));
117 if (tipc_udp_is_mcast_addr(ua))
118 addr->broadcast = TIPC_BROADCAST_SUPPORT;
121 /* tipc_udp_addr2str - convert ip/udp address to string */
122 static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size)
124 struct udp_media_addr *ua = (struct udp_media_addr *)&a->value;
126 if (ntohs(ua->proto) == ETH_P_IP)
127 snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port));
128 else if (ntohs(ua->proto) == ETH_P_IPV6)
129 snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port));
131 pr_err("Invalid UDP media address\n");
135 /* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */
136 static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a,
139 struct udp_media_addr *ua;
141 ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET);
142 if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP)
144 tipc_udp_media_addr_set(a, ua);
148 /* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */
149 static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a)
151 memset(msg, 0, TIPC_MEDIA_INFO_SIZE);
152 msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP;
153 memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value,
154 sizeof(struct udp_media_addr));
158 /* tipc_send_msg - enqueue a send request */
159 static int tipc_udp_xmit(struct net *net, struct sk_buff *skb,
160 struct udp_bearer *ub, struct udp_media_addr *src,
161 struct udp_media_addr *dst)
166 if (dst->proto == htons(ETH_P_IP)) {
168 .daddr = dst->ipv4.s_addr,
169 .saddr = src->ipv4.s_addr,
170 .flowi4_mark = skb->mark,
171 .flowi4_proto = IPPROTO_UDP
173 rt = ip_route_output_key(net, &fl);
179 skb->dev = rt->dst.dev;
180 ttl = ip4_dst_hoplimit(&rt->dst);
181 udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr,
182 dst->ipv4.s_addr, 0, ttl, 0, src->port,
183 dst->port, false, true);
184 #if IS_ENABLED(CONFIG_IPV6)
186 struct dst_entry *ndst;
187 struct flowi6 fl6 = {
188 .flowi6_oif = ub->ifindex,
191 .flowi6_proto = IPPROTO_UDP
193 err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst,
197 ttl = ip6_dst_hoplimit(ndst);
198 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb,
199 ndst->dev, &src->ipv6,
200 &dst->ipv6, 0, ttl, 0, src->port,
211 static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
212 struct tipc_bearer *b,
213 struct tipc_media_addr *addr)
215 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
216 struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value;
217 struct udp_replicast *rcast;
218 struct udp_bearer *ub;
221 if (skb_headroom(skb) < UDP_MIN_HEADROOM) {
222 err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC);
227 skb_set_inner_protocol(skb, htons(ETH_P_TIPC));
228 ub = rcu_dereference_rtnl(b->media_ptr);
234 if (addr->broadcast != TIPC_REPLICAST_SUPPORT)
235 return tipc_udp_xmit(net, skb, ub, src, dst);
237 /* Replicast, send an skb to each configured IP address */
238 list_for_each_entry_rcu(rcast, &ub->rcast.list, list) {
239 struct sk_buff *_skb;
241 _skb = pskb_copy(skb, GFP_ATOMIC);
247 err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr);
259 static bool tipc_udp_is_known_peer(struct tipc_bearer *b,
260 struct udp_media_addr *addr)
262 struct udp_replicast *rcast, *tmp;
263 struct udp_bearer *ub;
265 ub = rcu_dereference_rtnl(b->media_ptr);
267 pr_err_ratelimited("UDP bearer instance not found\n");
271 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
272 if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr)))
279 static int tipc_udp_rcast_add(struct tipc_bearer *b,
280 struct udp_media_addr *addr)
282 struct udp_replicast *rcast;
283 struct udp_bearer *ub;
285 ub = rcu_dereference_rtnl(b->media_ptr);
289 rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC);
293 memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr));
295 if (ntohs(addr->proto) == ETH_P_IP)
296 pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4);
297 #if IS_ENABLED(CONFIG_IPV6)
298 else if (ntohs(addr->proto) == ETH_P_IPV6)
299 pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6);
301 b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT;
302 list_add_rcu(&rcast->list, &ub->rcast.list);
306 static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb)
308 struct udp_media_addr src = {0};
309 struct udp_media_addr *dst;
311 dst = (struct udp_media_addr *)&b->bcast_addr.value;
312 if (tipc_udp_is_mcast_addr(dst))
315 src.port = udp_hdr(skb)->source;
317 if (ip_hdr(skb)->version == 4) {
318 struct iphdr *iphdr = ip_hdr(skb);
320 src.proto = htons(ETH_P_IP);
321 src.ipv4.s_addr = iphdr->saddr;
322 if (ipv4_is_multicast(iphdr->daddr))
324 #if IS_ENABLED(CONFIG_IPV6)
325 } else if (ip_hdr(skb)->version == 6) {
326 struct ipv6hdr *iphdr = ipv6_hdr(skb);
328 src.proto = htons(ETH_P_IPV6);
329 src.ipv6 = iphdr->saddr;
330 if (ipv6_addr_is_multicast(&iphdr->daddr))
337 if (likely(tipc_udp_is_known_peer(b, &src)))
340 return tipc_udp_rcast_add(b, &src);
343 /* tipc_udp_recv - read data from bearer socket */
344 static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb)
346 struct udp_bearer *ub;
347 struct tipc_bearer *b;
348 struct tipc_msg *hdr;
351 ub = rcu_dereference_sk_user_data(sk);
353 pr_err_ratelimited("Failed to get UDP bearer reference");
356 skb_pull(skb, sizeof(struct udphdr));
360 b = rcu_dereference_rtnl(ub->bearer);
364 if (b && test_bit(0, &b->up)) {
365 tipc_rcv(sock_net(sk), skb, b);
370 if (unlikely(msg_user(hdr) == LINK_CONFIG)) {
371 err = tipc_udp_rcast_disc(b, skb);
383 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
386 struct ip_mreqn mreqn;
387 struct sock *sk = ub->ubsock->sk;
389 if (ntohs(remote->proto) == ETH_P_IP) {
390 mreqn.imr_multiaddr = remote->ipv4;
391 mreqn.imr_ifindex = ub->ifindex;
392 err = ip_mc_join_group(sk, &mreqn);
393 #if IS_ENABLED(CONFIG_IPV6)
395 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex,
402 static int __tipc_nl_add_udp_addr(struct sk_buff *skb,
403 struct udp_media_addr *addr, int nla_t)
405 if (ntohs(addr->proto) == ETH_P_IP) {
406 struct sockaddr_in ip4;
408 memset(&ip4, 0, sizeof(ip4));
409 ip4.sin_family = AF_INET;
410 ip4.sin_port = addr->port;
411 ip4.sin_addr.s_addr = addr->ipv4.s_addr;
412 if (nla_put(skb, nla_t, sizeof(ip4), &ip4))
415 #if IS_ENABLED(CONFIG_IPV6)
416 } else if (ntohs(addr->proto) == ETH_P_IPV6) {
417 struct sockaddr_in6 ip6;
419 memset(&ip6, 0, sizeof(ip6));
420 ip6.sin6_family = AF_INET6;
421 ip6.sin6_port = addr->port;
422 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr));
423 if (nla_put(skb, nla_t, sizeof(ip6), &ip6))
431 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb)
433 u32 bid = cb->args[0];
434 u32 skip_cnt = cb->args[1];
435 u32 portid = NETLINK_CB(cb->skb).portid;
436 struct udp_replicast *rcast, *tmp;
437 struct tipc_bearer *b;
438 struct udp_bearer *ub;
443 if (!bid && !skip_cnt) {
444 struct net *net = sock_net(skb->sk);
445 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1];
446 struct nlattr **attrs;
449 err = tipc_nlmsg_parse(cb->nlh, &attrs);
453 if (!attrs[TIPC_NLA_BEARER])
456 err = nla_parse_nested(battrs, TIPC_NLA_BEARER_MAX,
457 attrs[TIPC_NLA_BEARER],
458 tipc_nl_bearer_policy, NULL);
462 if (!battrs[TIPC_NLA_BEARER_NAME])
465 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]);
468 b = tipc_bearer_find(net, bname);
475 struct net *net = sock_net(skb->sk);
476 struct tipc_net *tn = net_generic(net, tipc_net_id);
479 b = rtnl_dereference(tn->bearer_list[bid]);
486 ub = rcu_dereference_rtnl(b->media_ptr);
493 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
497 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq,
498 &tipc_genl_family, NLM_F_MULTI,
503 err = __tipc_nl_add_udp_addr(skb, &rcast->addr,
504 TIPC_NLA_UDP_REMOTE);
506 genlmsg_cancel(skb, hdr);
509 genlmsg_end(skb, hdr);
521 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b)
523 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
524 struct udp_media_addr *dst;
525 struct udp_bearer *ub;
528 ub = rcu_dereference_rtnl(b->media_ptr);
532 nest = nla_nest_start(msg->skb, TIPC_NLA_BEARER_UDP_OPTS);
536 if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL))
539 dst = (struct udp_media_addr *)&b->bcast_addr.value;
540 if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE))
543 if (!list_empty(&ub->rcast.list)) {
544 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP))
548 nla_nest_end(msg->skb, nest);
551 nla_nest_cancel(msg->skb, nest);
556 * tipc_parse_udp_addr - build udp media address from netlink data
557 * @nlattr: netlink attribute containing sockaddr storage aligned address
558 * @addr: tipc media address to fill with address, port and protocol type
559 * @scope_id: IPv6 scope id pointer, not NULL indicates it's required
562 static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr,
565 struct sockaddr_storage sa;
567 nla_memcpy(&sa, nla, sizeof(sa));
568 if (sa.ss_family == AF_INET) {
569 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa;
571 addr->proto = htons(ETH_P_IP);
572 addr->port = ip4->sin_port;
573 addr->ipv4.s_addr = ip4->sin_addr.s_addr;
576 #if IS_ENABLED(CONFIG_IPV6)
577 } else if (sa.ss_family == AF_INET6) {
578 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa;
580 addr->proto = htons(ETH_P_IPV6);
581 addr->port = ip6->sin6_port;
582 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr));
584 /* Scope ID is only interesting for local addresses */
588 atype = ipv6_addr_type(&ip6->sin6_addr);
589 if (__ipv6_addr_needs_scope_id(atype) &&
590 !ip6->sin6_scope_id) {
594 *scope_id = ip6->sin6_scope_id ? : 0;
600 return -EADDRNOTAVAIL;
603 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr)
606 struct udp_media_addr addr = {0};
607 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
608 struct udp_media_addr *dst;
610 if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, attr,
611 tipc_nl_udp_policy, NULL))
614 if (!opts[TIPC_NLA_UDP_REMOTE])
617 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL);
621 dst = (struct udp_media_addr *)&b->bcast_addr.value;
622 if (tipc_udp_is_mcast_addr(dst)) {
623 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n");
627 if (tipc_udp_is_known_peer(b, &addr))
630 return tipc_udp_rcast_add(b, &addr);
634 * tipc_udp_enable - callback to create a new udp bearer instance
635 * @net: network namespace
636 * @b: pointer to generic tipc_bearer
637 * @attrs: netlink bearer configuration
639 * validate the bearer parameters and initialize the udp bearer
640 * rtnl_lock should be held
642 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
643 struct nlattr *attrs[])
646 struct udp_bearer *ub;
647 struct udp_media_addr remote = {0};
648 struct udp_media_addr local = {0};
649 struct udp_port_cfg udp_conf = {0};
650 struct udp_tunnel_sock_cfg tuncfg = {NULL};
651 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
652 u8 node_id[NODE_ID_LEN] = {0,};
655 ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
659 INIT_LIST_HEAD(&ub->rcast.list);
661 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS])
664 if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX,
665 attrs[TIPC_NLA_BEARER_UDP_OPTS],
666 tipc_nl_udp_policy, NULL))
669 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) {
670 pr_err("Invalid UDP bearer configuration");
675 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local,
680 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL);
684 /* Checking remote ip address */
685 rmcast = tipc_udp_is_mcast_addr(&remote);
687 /* Autoconfigure own node identity if needed */
688 if (!tipc_own_id(net)) {
689 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16);
690 tipc_net_init(net, node_id, 0);
692 if (!tipc_own_id(net)) {
693 pr_warn("Failed to set node id, please configure manually\n");
698 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
699 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
700 rcu_assign_pointer(b->media_ptr, ub);
701 rcu_assign_pointer(ub->bearer, b);
702 tipc_udp_media_addr_set(&b->addr, &local);
703 if (local.proto == htons(ETH_P_IP)) {
704 struct net_device *dev;
706 dev = __ip_dev_find(net, local.ipv4.s_addr, false);
711 udp_conf.family = AF_INET;
713 /* Switch to use ANY to receive packets from group */
715 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
717 udp_conf.local_ip.s_addr = local.ipv4.s_addr;
718 udp_conf.use_udp_checksums = false;
719 ub->ifindex = dev->ifindex;
720 if (tipc_mtu_bad(dev, sizeof(struct iphdr) +
721 sizeof(struct udphdr))) {
725 b->mtu = b->media->mtu;
726 #if IS_ENABLED(CONFIG_IPV6)
727 } else if (local.proto == htons(ETH_P_IPV6)) {
728 udp_conf.family = AF_INET6;
729 udp_conf.use_udp6_tx_checksums = true;
730 udp_conf.use_udp6_rx_checksums = true;
732 udp_conf.local_ip6 = in6addr_any;
734 udp_conf.local_ip6 = local.ipv6;
741 udp_conf.local_udp_port = local.port;
742 err = udp_sock_create(net, &udp_conf, &ub->ubsock);
745 tuncfg.sk_user_data = ub;
746 tuncfg.encap_type = 1;
747 tuncfg.encap_rcv = tipc_udp_recv;
748 tuncfg.encap_destroy = NULL;
749 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);
752 * The bcast media address port is used for all peers and the ip
753 * is used if it's a multicast address.
755 memcpy(&b->bcast_addr.value, &remote, sizeof(remote));
757 err = enable_mcast(ub, &remote);
759 err = tipc_udp_rcast_add(b, &remote);
766 udp_tunnel_sock_release(ub->ubsock);
771 /* cleanup_bearer - break the socket/bearer association */
772 static void cleanup_bearer(struct work_struct *work)
774 struct udp_bearer *ub = container_of(work, struct udp_bearer, work);
775 struct udp_replicast *rcast, *tmp;
777 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
778 list_del_rcu(&rcast->list);
779 kfree_rcu(rcast, rcu);
783 udp_tunnel_sock_release(ub->ubsock);
788 /* tipc_udp_disable - detach bearer from socket */
789 static void tipc_udp_disable(struct tipc_bearer *b)
791 struct udp_bearer *ub;
793 ub = rcu_dereference_rtnl(b->media_ptr);
795 pr_err("UDP bearer instance not found\n");
799 sock_set_flag(ub->ubsock->sk, SOCK_DEAD);
800 RCU_INIT_POINTER(ub->bearer, NULL);
802 /* sock_release need to be done outside of rtnl lock */
803 INIT_WORK(&ub->work, cleanup_bearer);
804 schedule_work(&ub->work);
807 struct tipc_media udp_media_info = {
808 .send_msg = tipc_udp_send_msg,
809 .enable_media = tipc_udp_enable,
810 .disable_media = tipc_udp_disable,
811 .addr2str = tipc_udp_addr2str,
812 .addr2msg = tipc_udp_addr2msg,
813 .msg2addr = tipc_udp_msg2addr,
814 .priority = TIPC_DEF_LINK_PRI,
815 .tolerance = TIPC_DEF_LINK_TOL,
816 .window = TIPC_DEF_LINK_WIN,
817 .mtu = TIPC_DEF_LINK_UDP_MTU,
818 .type_id = TIPC_MEDIA_TYPE_UDP,