blob: f8dfee5072c0ee276a3d661fcc4275eed6c27aa1 [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"
Jon Paul Maloyef3ab7c2015-10-28 13:09:53 -040051#include "msg.h"
Erik Hugned0f91932015-03-05 10:23:49 +010052
53/* IANA assigned UDP port */
54#define UDP_PORT_DEFAULT 6118
55
56static const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = {
57 [TIPC_NLA_UDP_UNSPEC] = {.type = NLA_UNSPEC},
58 [TIPC_NLA_UDP_LOCAL] = {.type = NLA_BINARY,
59 .len = sizeof(struct sockaddr_storage)},
60 [TIPC_NLA_UDP_REMOTE] = {.type = NLA_BINARY,
61 .len = sizeof(struct sockaddr_storage)},
62};
63
64/**
65 * struct udp_media_addr - IP/UDP addressing information
66 *
67 * This is the bearer level originating address used in neighbor discovery
68 * messages, and all fields should be in network byte order
69 */
70struct udp_media_addr {
71 __be16 proto;
72 __be16 udp_port;
73 union {
74 struct in_addr ipv4;
75 struct in6_addr ipv6;
76 };
77};
78
79/**
80 * struct udp_bearer - ip/udp bearer data structure
81 * @bearer: associated generic tipc bearer
82 * @ubsock: bearer associated socket
83 * @ifindex: local address scope
84 * @work: used to schedule deferred work on a bearer
85 */
86struct udp_bearer {
87 struct tipc_bearer __rcu *bearer;
88 struct socket *ubsock;
89 u32 ifindex;
90 struct work_struct work;
91};
92
93/* udp_media_addr_set - convert a ip/udp address to a TIPC media address */
94static void tipc_udp_media_addr_set(struct tipc_media_addr *addr,
95 struct udp_media_addr *ua)
96{
97 memset(addr, 0, sizeof(struct tipc_media_addr));
98 addr->media_id = TIPC_MEDIA_TYPE_UDP;
99 memcpy(addr->value, ua, sizeof(struct udp_media_addr));
100 if (ntohs(ua->proto) == ETH_P_IP) {
101 if (ipv4_is_multicast(ua->ipv4.s_addr))
102 addr->broadcast = 1;
103 } else if (ntohs(ua->proto) == ETH_P_IPV6) {
104 if (ipv6_addr_type(&ua->ipv6) & IPV6_ADDR_MULTICAST)
105 addr->broadcast = 1;
106 } else {
107 pr_err("Invalid UDP media address\n");
108 }
109}
110
111/* tipc_udp_addr2str - convert ip/udp address to string */
112static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size)
113{
114 struct udp_media_addr *ua = (struct udp_media_addr *)&a->value;
115
116 if (ntohs(ua->proto) == ETH_P_IP)
117 snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->udp_port));
118 else if (ntohs(ua->proto) == ETH_P_IPV6)
119 snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->udp_port));
120 else
121 pr_err("Invalid UDP media address\n");
122 return 0;
123}
124
125/* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */
126static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a,
127 char *msg)
128{
129 struct udp_media_addr *ua;
130
131 ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET);
132 if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP)
133 return -EINVAL;
134 tipc_udp_media_addr_set(a, ua);
135 return 0;
136}
137
138/* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */
139static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a)
140{
141 memset(msg, 0, TIPC_MEDIA_INFO_SIZE);
142 msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP;
143 memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value,
144 sizeof(struct udp_media_addr));
145 return 0;
146}
147
148/* tipc_send_msg - enqueue a send request */
149static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
150 struct tipc_bearer *b,
151 struct tipc_media_addr *dest)
152{
153 int ttl, err = 0;
154 struct udp_bearer *ub;
155 struct udp_media_addr *dst = (struct udp_media_addr *)&dest->value;
156 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
157 struct sk_buff *clone;
158 struct rtable *rt;
159
160 clone = skb_clone(skb, GFP_ATOMIC);
161 skb_set_inner_protocol(clone, htons(ETH_P_TIPC));
162 ub = rcu_dereference_rtnl(b->media_ptr);
163 if (!ub) {
164 err = -ENODEV;
165 goto tx_error;
166 }
Erik Hugne4fee6be82015-03-09 10:19:31 +0100167 if (dst->proto == htons(ETH_P_IP)) {
Erik Hugned0f91932015-03-05 10:23:49 +0100168 struct flowi4 fl = {
169 .daddr = dst->ipv4.s_addr,
170 .saddr = src->ipv4.s_addr,
171 .flowi4_mark = clone->mark,
172 .flowi4_proto = IPPROTO_UDP
173 };
174 rt = ip_route_output_key(net, &fl);
175 if (IS_ERR(rt)) {
176 err = PTR_ERR(rt);
177 goto tx_error;
178 }
179 ttl = ip4_dst_hoplimit(&rt->dst);
David Miller79b16aa2015-04-05 22:19:09 -0400180 err = udp_tunnel_xmit_skb(rt, ub->ubsock->sk, clone,
181 src->ipv4.s_addr,
Erik Hugned0f91932015-03-05 10:23:49 +0100182 dst->ipv4.s_addr, 0, ttl, 0,
183 src->udp_port, dst->udp_port,
184 false, true);
185 if (err < 0) {
186 ip_rt_put(rt);
187 goto tx_error;
188 }
189#if IS_ENABLED(CONFIG_IPV6)
190 } else {
191 struct dst_entry *ndst;
192 struct flowi6 fl6 = {
193 .flowi6_oif = ub->ifindex,
194 .daddr = dst->ipv6,
195 .saddr = src->ipv6,
196 .flowi6_proto = IPPROTO_UDP
197 };
Ying Xueed3e8522015-03-24 16:59:21 +0800198 err = ipv6_stub->ipv6_dst_lookup(ub->ubsock->sk, &ndst, &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;
Jon Paul Maloyef3ab7c2015-10-28 13:09:53 -0400220 int usr = msg_user(buf_msg(skb));
221
222 if ((usr == LINK_PROTOCOL) || (usr == NAME_DISTRIBUTOR))
223 skb_linearize(skb);
Erik Hugned0f91932015-03-05 10:23:49 +0100224
225 ub = rcu_dereference_sk_user_data(sk);
226 if (!ub) {
227 pr_err_ratelimited("Failed to get UDP bearer reference");
228 kfree_skb(skb);
229 return 0;
230 }
231
232 skb_pull(skb, sizeof(struct udphdr));
233 rcu_read_lock();
234 b = rcu_dereference_rtnl(ub->bearer);
235
236 if (b) {
237 tipc_rcv(sock_net(sk), skb, b);
238 rcu_read_unlock();
239 return 0;
240 }
241 rcu_read_unlock();
242 kfree_skb(skb);
243 return 0;
244}
245
246static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
247{
248 int err = 0;
249 struct ip_mreqn mreqn;
250 struct sock *sk = ub->ubsock->sk;
251
252 if (ntohs(remote->proto) == ETH_P_IP) {
253 if (!ipv4_is_multicast(remote->ipv4.s_addr))
254 return 0;
255 mreqn.imr_multiaddr = remote->ipv4;
256 mreqn.imr_ifindex = ub->ifindex;
Marcelo Ricardo Leitner54ff9ef2015-03-18 14:50:43 -0300257 err = ip_mc_join_group(sk, &mreqn);
Marcelo Ricardo Leitner446981e2015-03-19 16:47:58 -0300258#if IS_ENABLED(CONFIG_IPV6)
Erik Hugned0f91932015-03-05 10:23:49 +0100259 } else {
260 if (!ipv6_addr_is_multicast(&remote->ipv6))
261 return 0;
Marcelo Ricardo Leitner446981e2015-03-19 16:47:58 -0300262 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex,
263 &remote->ipv6);
264#endif
Erik Hugned0f91932015-03-05 10:23:49 +0100265 }
266 return err;
267}
268
269/**
270 * parse_options - build local/remote addresses from configuration
271 * @attrs: netlink config data
272 * @ub: UDP bearer instance
273 * @local: local bearer IP address/port
274 * @remote: peer or multicast IP/port
275 */
276static int parse_options(struct nlattr *attrs[], struct udp_bearer *ub,
277 struct udp_media_addr *local,
278 struct udp_media_addr *remote)
279{
280 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
281 struct sockaddr_storage *sa_local, *sa_remote;
282
283 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS])
284 goto err;
285 if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX,
286 attrs[TIPC_NLA_BEARER_UDP_OPTS],
287 tipc_nl_udp_policy))
288 goto err;
289 if (opts[TIPC_NLA_UDP_LOCAL] && opts[TIPC_NLA_UDP_REMOTE]) {
290 sa_local = nla_data(opts[TIPC_NLA_UDP_LOCAL]);
291 sa_remote = nla_data(opts[TIPC_NLA_UDP_REMOTE]);
292 } else {
293err:
294 pr_err("Invalid UDP bearer configuration");
295 return -EINVAL;
296 }
297 if ((sa_local->ss_family & sa_remote->ss_family) == AF_INET) {
298 struct sockaddr_in *ip4;
299
300 ip4 = (struct sockaddr_in *)sa_local;
301 local->proto = htons(ETH_P_IP);
302 local->udp_port = ip4->sin_port;
303 local->ipv4.s_addr = ip4->sin_addr.s_addr;
304
305 ip4 = (struct sockaddr_in *)sa_remote;
306 remote->proto = htons(ETH_P_IP);
307 remote->udp_port = ip4->sin_port;
308 remote->ipv4.s_addr = ip4->sin_addr.s_addr;
309 return 0;
310
311#if IS_ENABLED(CONFIG_IPV6)
312 } else if ((sa_local->ss_family & sa_remote->ss_family) == AF_INET6) {
313 struct sockaddr_in6 *ip6;
314
315 ip6 = (struct sockaddr_in6 *)sa_local;
316 local->proto = htons(ETH_P_IPV6);
317 local->udp_port = ip6->sin6_port;
318 local->ipv6 = ip6->sin6_addr;
319 ub->ifindex = ip6->sin6_scope_id;
320
321 ip6 = (struct sockaddr_in6 *)sa_remote;
322 remote->proto = htons(ETH_P_IPV6);
323 remote->udp_port = ip6->sin6_port;
324 remote->ipv6 = ip6->sin6_addr;
325 return 0;
326#endif
327 }
328 return -EADDRNOTAVAIL;
329}
330
331/**
332 * tipc_udp_enable - callback to create a new udp bearer instance
333 * @net: network namespace
334 * @b: pointer to generic tipc_bearer
335 * @attrs: netlink bearer configuration
336 *
337 * validate the bearer parameters and initialize the udp bearer
338 * rtnl_lock should be held
339 */
340static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
341 struct nlattr *attrs[])
342{
343 int err = -EINVAL;
344 struct udp_bearer *ub;
345 struct udp_media_addr *remote;
346 struct udp_media_addr local = {0};
347 struct udp_port_cfg udp_conf = {0};
Erik Hugne4fee6be82015-03-09 10:19:31 +0100348 struct udp_tunnel_sock_cfg tuncfg = {NULL};
Erik Hugned0f91932015-03-05 10:23:49 +0100349
350 ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
351 if (!ub)
352 return -ENOMEM;
353
354 remote = (struct udp_media_addr *)&b->bcast_addr.value;
355 memset(remote, 0, sizeof(struct udp_media_addr));
356 err = parse_options(attrs, ub, &local, remote);
357 if (err)
358 goto err;
359
360 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
361 b->bcast_addr.broadcast = 1;
362 rcu_assign_pointer(b->media_ptr, ub);
363 rcu_assign_pointer(ub->bearer, b);
364 tipc_udp_media_addr_set(&b->addr, &local);
Erik Hugne4fee6be82015-03-09 10:19:31 +0100365 if (local.proto == htons(ETH_P_IP)) {
Erik Hugned0f91932015-03-05 10:23:49 +0100366 struct net_device *dev;
367
368 dev = __ip_dev_find(net, local.ipv4.s_addr, false);
369 if (!dev) {
370 err = -ENODEV;
371 goto err;
372 }
373 udp_conf.family = AF_INET;
374 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
375 udp_conf.use_udp_checksums = false;
376 ub->ifindex = dev->ifindex;
377 b->mtu = dev->mtu - sizeof(struct iphdr)
378 - sizeof(struct udphdr);
379#if IS_ENABLED(CONFIG_IPV6)
Erik Hugne4fee6be82015-03-09 10:19:31 +0100380 } else if (local.proto == htons(ETH_P_IPV6)) {
Erik Hugned0f91932015-03-05 10:23:49 +0100381 udp_conf.family = AF_INET6;
382 udp_conf.use_udp6_tx_checksums = true;
383 udp_conf.use_udp6_rx_checksums = true;
384 udp_conf.local_ip6 = in6addr_any;
385 b->mtu = 1280;
386#endif
387 } else {
388 err = -EAFNOSUPPORT;
389 goto err;
390 }
391 udp_conf.local_udp_port = local.udp_port;
392 err = udp_sock_create(net, &udp_conf, &ub->ubsock);
393 if (err)
394 goto err;
395 tuncfg.sk_user_data = ub;
396 tuncfg.encap_type = 1;
397 tuncfg.encap_rcv = tipc_udp_recv;
398 tuncfg.encap_destroy = NULL;
399 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);
400
401 if (enable_mcast(ub, remote))
402 goto err;
403 return 0;
404err:
405 kfree(ub);
406 return err;
407}
408
409/* cleanup_bearer - break the socket/bearer association */
410static void cleanup_bearer(struct work_struct *work)
411{
412 struct udp_bearer *ub = container_of(work, struct udp_bearer, work);
413
414 if (ub->ubsock)
415 udp_tunnel_sock_release(ub->ubsock);
416 synchronize_net();
417 kfree(ub);
418}
419
420/* tipc_udp_disable - detach bearer from socket */
421static void tipc_udp_disable(struct tipc_bearer *b)
422{
423 struct udp_bearer *ub;
424
425 ub = rcu_dereference_rtnl(b->media_ptr);
426 if (!ub) {
427 pr_err("UDP bearer instance not found\n");
428 return;
429 }
430 if (ub->ubsock)
431 sock_set_flag(ub->ubsock->sk, SOCK_DEAD);
432 RCU_INIT_POINTER(b->media_ptr, NULL);
433 RCU_INIT_POINTER(ub->bearer, NULL);
434
435 /* sock_release need to be done outside of rtnl lock */
436 INIT_WORK(&ub->work, cleanup_bearer);
437 schedule_work(&ub->work);
438}
439
440struct tipc_media udp_media_info = {
441 .send_msg = tipc_udp_send_msg,
442 .enable_media = tipc_udp_enable,
443 .disable_media = tipc_udp_disable,
444 .addr2str = tipc_udp_addr2str,
445 .addr2msg = tipc_udp_addr2msg,
446 .msg2addr = tipc_udp_msg2addr,
447 .priority = TIPC_DEF_LINK_PRI,
448 .tolerance = TIPC_DEF_LINK_TOL,
449 .window = TIPC_DEF_LINK_WIN,
450 .type_id = TIPC_MEDIA_TYPE_UDP,
451 .hwaddr_len = 0,
452 .name = "udp"
453};