blob: c170d3138953a2361df5439aeffadd29afa52ad9 [file] [log] [blame]
Erik Hugned0f91932015-03-05 10:23:49 +01001/* net/tipc/udp_media.c: IP bearer support for TIPC
2 *
3 * Copyright (c) 2015, Ericsson AB
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
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.
17 *
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.
21 *
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.
33 */
34
35#include <linux/socket.h>
36#include <linux/ip.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>
44#include <net/sock.h>
45#include <net/ip.h>
46#include <net/udp_tunnel.h>
Marcelo Ricardo Leitner446981e2015-03-19 16:47:58 -030047#include <net/addrconf.h>
Erik Hugned0f91932015-03-05 10:23:49 +010048#include <linux/tipc_netlink.h>
49#include "core.h"
50#include "bearer.h"
51
52/* IANA assigned UDP port */
53#define UDP_PORT_DEFAULT 6118
54
55static const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = {
56 [TIPC_NLA_UDP_UNSPEC] = {.type = NLA_UNSPEC},
57 [TIPC_NLA_UDP_LOCAL] = {.type = NLA_BINARY,
58 .len = sizeof(struct sockaddr_storage)},
59 [TIPC_NLA_UDP_REMOTE] = {.type = NLA_BINARY,
60 .len = sizeof(struct sockaddr_storage)},
61};
62
63/**
64 * struct udp_media_addr - IP/UDP addressing information
65 *
66 * This is the bearer level originating address used in neighbor discovery
67 * messages, and all fields should be in network byte order
68 */
69struct udp_media_addr {
70 __be16 proto;
71 __be16 udp_port;
72 union {
73 struct in_addr ipv4;
74 struct in6_addr ipv6;
75 };
76};
77
78/**
79 * struct udp_bearer - ip/udp bearer data structure
80 * @bearer: associated generic tipc bearer
81 * @ubsock: bearer associated socket
82 * @ifindex: local address scope
83 * @work: used to schedule deferred work on a bearer
84 */
85struct udp_bearer {
86 struct tipc_bearer __rcu *bearer;
87 struct socket *ubsock;
88 u32 ifindex;
89 struct work_struct work;
90};
91
92/* udp_media_addr_set - convert a ip/udp address to a TIPC media address */
93static void tipc_udp_media_addr_set(struct tipc_media_addr *addr,
94 struct udp_media_addr *ua)
95{
96 memset(addr, 0, sizeof(struct tipc_media_addr));
97 addr->media_id = TIPC_MEDIA_TYPE_UDP;
98 memcpy(addr->value, ua, sizeof(struct udp_media_addr));
99 if (ntohs(ua->proto) == ETH_P_IP) {
100 if (ipv4_is_multicast(ua->ipv4.s_addr))
101 addr->broadcast = 1;
102 } else if (ntohs(ua->proto) == ETH_P_IPV6) {
103 if (ipv6_addr_type(&ua->ipv6) & IPV6_ADDR_MULTICAST)
104 addr->broadcast = 1;
105 } else {
106 pr_err("Invalid UDP media address\n");
107 }
108}
109
110/* tipc_udp_addr2str - convert ip/udp address to string */
111static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size)
112{
113 struct udp_media_addr *ua = (struct udp_media_addr *)&a->value;
114
115 if (ntohs(ua->proto) == ETH_P_IP)
116 snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->udp_port));
117 else if (ntohs(ua->proto) == ETH_P_IPV6)
118 snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->udp_port));
119 else
120 pr_err("Invalid UDP media address\n");
121 return 0;
122}
123
124/* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */
125static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a,
126 char *msg)
127{
128 struct udp_media_addr *ua;
129
130 ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET);
131 if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP)
132 return -EINVAL;
133 tipc_udp_media_addr_set(a, ua);
134 return 0;
135}
136
137/* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */
138static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a)
139{
140 memset(msg, 0, TIPC_MEDIA_INFO_SIZE);
141 msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP;
142 memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value,
143 sizeof(struct udp_media_addr));
144 return 0;
145}
146
147/* tipc_send_msg - enqueue a send request */
148static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
149 struct tipc_bearer *b,
150 struct tipc_media_addr *dest)
151{
152 int ttl, err = 0;
153 struct udp_bearer *ub;
154 struct udp_media_addr *dst = (struct udp_media_addr *)&dest->value;
155 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
156 struct sk_buff *clone;
157 struct rtable *rt;
158
159 clone = skb_clone(skb, GFP_ATOMIC);
160 skb_set_inner_protocol(clone, htons(ETH_P_TIPC));
161 ub = rcu_dereference_rtnl(b->media_ptr);
162 if (!ub) {
163 err = -ENODEV;
164 goto tx_error;
165 }
Erik Hugne4fee6be82015-03-09 10:19:31 +0100166 if (dst->proto == htons(ETH_P_IP)) {
Erik Hugned0f91932015-03-05 10:23:49 +0100167 struct flowi4 fl = {
168 .daddr = dst->ipv4.s_addr,
169 .saddr = src->ipv4.s_addr,
170 .flowi4_mark = clone->mark,
171 .flowi4_proto = IPPROTO_UDP
172 };
173 rt = ip_route_output_key(net, &fl);
174 if (IS_ERR(rt)) {
175 err = PTR_ERR(rt);
176 goto tx_error;
177 }
178 ttl = ip4_dst_hoplimit(&rt->dst);
David Miller79b16aa2015-04-05 22:19:09 -0400179 err = udp_tunnel_xmit_skb(rt, ub->ubsock->sk, clone,
180 src->ipv4.s_addr,
Erik Hugned0f91932015-03-05 10:23:49 +0100181 dst->ipv4.s_addr, 0, ttl, 0,
182 src->udp_port, dst->udp_port,
183 false, true);
184 if (err < 0) {
185 ip_rt_put(rt);
186 goto tx_error;
187 }
188#if IS_ENABLED(CONFIG_IPV6)
189 } else {
190 struct dst_entry *ndst;
191 struct flowi6 fl6 = {
192 .flowi6_oif = ub->ifindex,
193 .daddr = dst->ipv6,
194 .saddr = src->ipv6,
195 .flowi6_proto = IPPROTO_UDP
196 };
Roopa Prabhu343d60a2015-07-30 13:34:53 -0700197 err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst,
198 &fl6);
Erik Hugned0f91932015-03-05 10:23:49 +0100199 if (err)
200 goto tx_error;
201 ttl = ip6_dst_hoplimit(ndst);
David Miller79b16aa2015-04-05 22:19:09 -0400202 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, clone,
203 ndst->dev, &src->ipv6,
Erik Hugned0f91932015-03-05 10:23:49 +0100204 &dst->ipv6, 0, ttl, src->udp_port,
205 dst->udp_port, false);
206#endif
207 }
208 return err;
209
210tx_error:
211 kfree_skb(clone);
212 return err;
213}
214
215/* tipc_udp_recv - read data from bearer socket */
216static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb)
217{
218 struct udp_bearer *ub;
219 struct tipc_bearer *b;
220
221 ub = rcu_dereference_sk_user_data(sk);
222 if (!ub) {
223 pr_err_ratelimited("Failed to get UDP bearer reference");
224 kfree_skb(skb);
225 return 0;
226 }
227
228 skb_pull(skb, sizeof(struct udphdr));
229 rcu_read_lock();
230 b = rcu_dereference_rtnl(ub->bearer);
231
232 if (b) {
233 tipc_rcv(sock_net(sk), skb, b);
234 rcu_read_unlock();
235 return 0;
236 }
237 rcu_read_unlock();
238 kfree_skb(skb);
239 return 0;
240}
241
242static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
243{
244 int err = 0;
245 struct ip_mreqn mreqn;
246 struct sock *sk = ub->ubsock->sk;
247
248 if (ntohs(remote->proto) == ETH_P_IP) {
249 if (!ipv4_is_multicast(remote->ipv4.s_addr))
250 return 0;
251 mreqn.imr_multiaddr = remote->ipv4;
252 mreqn.imr_ifindex = ub->ifindex;
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -0300253 err = ip_mc_join_group(sk, &mreqn);
Marcelo Ricardo Leitner446981e2015-03-19 16:47:58 -0300254#if IS_ENABLED(CONFIG_IPV6)
Erik Hugned0f91932015-03-05 10:23:49 +0100255 } else {
256 if (!ipv6_addr_is_multicast(&remote->ipv6))
257 return 0;
Marcelo Ricardo Leitner446981e2015-03-19 16:47:58 -0300258 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex,
259 &remote->ipv6);
260#endif
Erik Hugned0f91932015-03-05 10:23:49 +0100261 }
262 return err;
263}
264
265/**
266 * parse_options - build local/remote addresses from configuration
267 * @attrs: netlink config data
268 * @ub: UDP bearer instance
269 * @local: local bearer IP address/port
270 * @remote: peer or multicast IP/port
271 */
272static int parse_options(struct nlattr *attrs[], struct udp_bearer *ub,
273 struct udp_media_addr *local,
274 struct udp_media_addr *remote)
275{
276 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
277 struct sockaddr_storage *sa_local, *sa_remote;
278
279 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS])
280 goto err;
281 if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX,
282 attrs[TIPC_NLA_BEARER_UDP_OPTS],
283 tipc_nl_udp_policy))
284 goto err;
285 if (opts[TIPC_NLA_UDP_LOCAL] && opts[TIPC_NLA_UDP_REMOTE]) {
286 sa_local = nla_data(opts[TIPC_NLA_UDP_LOCAL]);
287 sa_remote = nla_data(opts[TIPC_NLA_UDP_REMOTE]);
288 } else {
289err:
290 pr_err("Invalid UDP bearer configuration");
291 return -EINVAL;
292 }
293 if ((sa_local->ss_family & sa_remote->ss_family) == AF_INET) {
294 struct sockaddr_in *ip4;
295
296 ip4 = (struct sockaddr_in *)sa_local;
297 local->proto = htons(ETH_P_IP);
298 local->udp_port = ip4->sin_port;
299 local->ipv4.s_addr = ip4->sin_addr.s_addr;
300
301 ip4 = (struct sockaddr_in *)sa_remote;
302 remote->proto = htons(ETH_P_IP);
303 remote->udp_port = ip4->sin_port;
304 remote->ipv4.s_addr = ip4->sin_addr.s_addr;
305 return 0;
306
307#if IS_ENABLED(CONFIG_IPV6)
308 } else if ((sa_local->ss_family & sa_remote->ss_family) == AF_INET6) {
309 struct sockaddr_in6 *ip6;
310
311 ip6 = (struct sockaddr_in6 *)sa_local;
312 local->proto = htons(ETH_P_IPV6);
313 local->udp_port = ip6->sin6_port;
314 local->ipv6 = ip6->sin6_addr;
315 ub->ifindex = ip6->sin6_scope_id;
316
317 ip6 = (struct sockaddr_in6 *)sa_remote;
318 remote->proto = htons(ETH_P_IPV6);
319 remote->udp_port = ip6->sin6_port;
320 remote->ipv6 = ip6->sin6_addr;
321 return 0;
322#endif
323 }
324 return -EADDRNOTAVAIL;
325}
326
327/**
328 * tipc_udp_enable - callback to create a new udp bearer instance
329 * @net: network namespace
330 * @b: pointer to generic tipc_bearer
331 * @attrs: netlink bearer configuration
332 *
333 * validate the bearer parameters and initialize the udp bearer
334 * rtnl_lock should be held
335 */
336static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
337 struct nlattr *attrs[])
338{
339 int err = -EINVAL;
340 struct udp_bearer *ub;
341 struct udp_media_addr *remote;
342 struct udp_media_addr local = {0};
343 struct udp_port_cfg udp_conf = {0};
Erik Hugne4fee6be82015-03-09 10:19:31 +0100344 struct udp_tunnel_sock_cfg tuncfg = {NULL};
Erik Hugned0f91932015-03-05 10:23:49 +0100345
346 ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
347 if (!ub)
348 return -ENOMEM;
349
350 remote = (struct udp_media_addr *)&b->bcast_addr.value;
351 memset(remote, 0, sizeof(struct udp_media_addr));
352 err = parse_options(attrs, ub, &local, remote);
353 if (err)
354 goto err;
355
356 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
357 b->bcast_addr.broadcast = 1;
358 rcu_assign_pointer(b->media_ptr, ub);
359 rcu_assign_pointer(ub->bearer, b);
360 tipc_udp_media_addr_set(&b->addr, &local);
Erik Hugne4fee6be82015-03-09 10:19:31 +0100361 if (local.proto == htons(ETH_P_IP)) {
Erik Hugned0f91932015-03-05 10:23:49 +0100362 struct net_device *dev;
363
364 dev = __ip_dev_find(net, local.ipv4.s_addr, false);
365 if (!dev) {
366 err = -ENODEV;
367 goto err;
368 }
369 udp_conf.family = AF_INET;
370 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
371 udp_conf.use_udp_checksums = false;
372 ub->ifindex = dev->ifindex;
373 b->mtu = dev->mtu - sizeof(struct iphdr)
374 - sizeof(struct udphdr);
375#if IS_ENABLED(CONFIG_IPV6)
Erik Hugne4fee6be82015-03-09 10:19:31 +0100376 } else if (local.proto == htons(ETH_P_IPV6)) {
Erik Hugned0f91932015-03-05 10:23:49 +0100377 udp_conf.family = AF_INET6;
378 udp_conf.use_udp6_tx_checksums = true;
379 udp_conf.use_udp6_rx_checksums = true;
380 udp_conf.local_ip6 = in6addr_any;
381 b->mtu = 1280;
382#endif
383 } else {
384 err = -EAFNOSUPPORT;
385 goto err;
386 }
387 udp_conf.local_udp_port = local.udp_port;
388 err = udp_sock_create(net, &udp_conf, &ub->ubsock);
389 if (err)
390 goto err;
391 tuncfg.sk_user_data = ub;
392 tuncfg.encap_type = 1;
393 tuncfg.encap_rcv = tipc_udp_recv;
394 tuncfg.encap_destroy = NULL;
395 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);
396
397 if (enable_mcast(ub, remote))
398 goto err;
399 return 0;
400err:
401 kfree(ub);
402 return err;
403}
404
405/* cleanup_bearer - break the socket/bearer association */
406static void cleanup_bearer(struct work_struct *work)
407{
408 struct udp_bearer *ub = container_of(work, struct udp_bearer, work);
409
410 if (ub->ubsock)
411 udp_tunnel_sock_release(ub->ubsock);
412 synchronize_net();
413 kfree(ub);
414}
415
416/* tipc_udp_disable - detach bearer from socket */
417static void tipc_udp_disable(struct tipc_bearer *b)
418{
419 struct udp_bearer *ub;
420
421 ub = rcu_dereference_rtnl(b->media_ptr);
422 if (!ub) {
423 pr_err("UDP bearer instance not found\n");
424 return;
425 }
426 if (ub->ubsock)
427 sock_set_flag(ub->ubsock->sk, SOCK_DEAD);
428 RCU_INIT_POINTER(b->media_ptr, NULL);
429 RCU_INIT_POINTER(ub->bearer, NULL);
430
431 /* sock_release need to be done outside of rtnl lock */
432 INIT_WORK(&ub->work, cleanup_bearer);
433 schedule_work(&ub->work);
434}
435
436struct tipc_media udp_media_info = {
437 .send_msg = tipc_udp_send_msg,
438 .enable_media = tipc_udp_enable,
439 .disable_media = tipc_udp_disable,
440 .addr2str = tipc_udp_addr2str,
441 .addr2msg = tipc_udp_addr2msg,
442 .msg2addr = tipc_udp_msg2addr,
443 .priority = TIPC_DEF_LINK_PRI,
444 .tolerance = TIPC_DEF_LINK_TOL,
445 .window = TIPC_DEF_LINK_WIN,
446 .type_id = TIPC_MEDIA_TYPE_UDP,
447 .hwaddr_len = 0,
448 .name = "udp"
449};