Loading...
Note: File does not exist in v3.15.
1/* 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>
47#include <net/addrconf.h>
48#include <linux/tipc_netlink.h>
49#include "core.h"
50#include "bearer.h"
51#include "netlink.h"
52
53/* IANA assigned UDP port */
54#define UDP_PORT_DEFAULT 6118
55
56#define UDP_MIN_HEADROOM 48
57
58/**
59 * struct udp_media_addr - IP/UDP addressing information
60 *
61 * This is the bearer level originating address used in neighbor discovery
62 * messages, and all fields should be in network byte order
63 */
64struct udp_media_addr {
65 __be16 proto;
66 __be16 udp_port;
67 union {
68 struct in_addr ipv4;
69 struct in6_addr ipv6;
70 };
71};
72
73/**
74 * struct udp_bearer - ip/udp bearer data structure
75 * @bearer: associated generic tipc bearer
76 * @ubsock: bearer associated socket
77 * @ifindex: local address scope
78 * @work: used to schedule deferred work on a bearer
79 */
80struct udp_bearer {
81 struct tipc_bearer __rcu *bearer;
82 struct socket *ubsock;
83 u32 ifindex;
84 struct work_struct work;
85};
86
87/* udp_media_addr_set - convert a ip/udp address to a TIPC media address */
88static void tipc_udp_media_addr_set(struct tipc_media_addr *addr,
89 struct udp_media_addr *ua)
90{
91 memset(addr, 0, sizeof(struct tipc_media_addr));
92 addr->media_id = TIPC_MEDIA_TYPE_UDP;
93 memcpy(addr->value, ua, sizeof(struct udp_media_addr));
94 if (ntohs(ua->proto) == ETH_P_IP) {
95 if (ipv4_is_multicast(ua->ipv4.s_addr))
96 addr->broadcast = 1;
97 } else if (ntohs(ua->proto) == ETH_P_IPV6) {
98 if (ipv6_addr_type(&ua->ipv6) & IPV6_ADDR_MULTICAST)
99 addr->broadcast = 1;
100 } else {
101 pr_err("Invalid UDP media address\n");
102 }
103}
104
105/* tipc_udp_addr2str - convert ip/udp address to string */
106static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size)
107{
108 struct udp_media_addr *ua = (struct udp_media_addr *)&a->value;
109
110 if (ntohs(ua->proto) == ETH_P_IP)
111 snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->udp_port));
112 else if (ntohs(ua->proto) == ETH_P_IPV6)
113 snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->udp_port));
114 else
115 pr_err("Invalid UDP media address\n");
116 return 0;
117}
118
119/* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */
120static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a,
121 char *msg)
122{
123 struct udp_media_addr *ua;
124
125 ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET);
126 if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP)
127 return -EINVAL;
128 tipc_udp_media_addr_set(a, ua);
129 return 0;
130}
131
132/* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */
133static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a)
134{
135 memset(msg, 0, TIPC_MEDIA_INFO_SIZE);
136 msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP;
137 memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value,
138 sizeof(struct udp_media_addr));
139 return 0;
140}
141
142/* tipc_send_msg - enqueue a send request */
143static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
144 struct tipc_bearer *b,
145 struct tipc_media_addr *dest)
146{
147 int ttl, err = 0;
148 struct udp_bearer *ub;
149 struct udp_media_addr *dst = (struct udp_media_addr *)&dest->value;
150 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
151 struct rtable *rt;
152
153 if (skb_headroom(skb) < UDP_MIN_HEADROOM) {
154 err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC);
155 if (err)
156 goto tx_error;
157 }
158
159 skb_set_inner_protocol(skb, htons(ETH_P_TIPC));
160 ub = rcu_dereference_rtnl(b->media_ptr);
161 if (!ub) {
162 err = -ENODEV;
163 goto tx_error;
164 }
165 if (dst->proto == htons(ETH_P_IP)) {
166 struct flowi4 fl = {
167 .daddr = dst->ipv4.s_addr,
168 .saddr = src->ipv4.s_addr,
169 .flowi4_mark = skb->mark,
170 .flowi4_proto = IPPROTO_UDP
171 };
172 rt = ip_route_output_key(net, &fl);
173 if (IS_ERR(rt)) {
174 err = PTR_ERR(rt);
175 goto tx_error;
176 }
177
178 skb->dev = rt->dst.dev;
179 ttl = ip4_dst_hoplimit(&rt->dst);
180 udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr,
181 dst->ipv4.s_addr, 0, ttl, 0, src->udp_port,
182 dst->udp_port, false, true);
183#if IS_ENABLED(CONFIG_IPV6)
184 } else {
185 struct dst_entry *ndst;
186 struct flowi6 fl6 = {
187 .flowi6_oif = ub->ifindex,
188 .daddr = dst->ipv6,
189 .saddr = src->ipv6,
190 .flowi6_proto = IPPROTO_UDP
191 };
192 err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst,
193 &fl6);
194 if (err)
195 goto tx_error;
196 ttl = ip6_dst_hoplimit(ndst);
197 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb,
198 ndst->dev, &src->ipv6,
199 &dst->ipv6, 0, ttl, 0, src->udp_port,
200 dst->udp_port, false);
201#endif
202 }
203 return err;
204
205tx_error:
206 kfree_skb(skb);
207 return err;
208}
209
210/* tipc_udp_recv - read data from bearer socket */
211static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb)
212{
213 struct udp_bearer *ub;
214 struct tipc_bearer *b;
215
216 ub = rcu_dereference_sk_user_data(sk);
217 if (!ub) {
218 pr_err_ratelimited("Failed to get UDP bearer reference");
219 kfree_skb(skb);
220 return 0;
221 }
222
223 skb_pull(skb, sizeof(struct udphdr));
224 rcu_read_lock();
225 b = rcu_dereference_rtnl(ub->bearer);
226
227 if (b) {
228 tipc_rcv(sock_net(sk), skb, b);
229 rcu_read_unlock();
230 return 0;
231 }
232 rcu_read_unlock();
233 kfree_skb(skb);
234 return 0;
235}
236
237static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
238{
239 int err = 0;
240 struct ip_mreqn mreqn;
241 struct sock *sk = ub->ubsock->sk;
242
243 if (ntohs(remote->proto) == ETH_P_IP) {
244 if (!ipv4_is_multicast(remote->ipv4.s_addr))
245 return 0;
246 mreqn.imr_multiaddr = remote->ipv4;
247 mreqn.imr_ifindex = ub->ifindex;
248 err = ip_mc_join_group(sk, &mreqn);
249#if IS_ENABLED(CONFIG_IPV6)
250 } else {
251 if (!ipv6_addr_is_multicast(&remote->ipv6))
252 return 0;
253 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex,
254 &remote->ipv6);
255#endif
256 }
257 return err;
258}
259
260/**
261 * parse_options - build local/remote addresses from configuration
262 * @attrs: netlink config data
263 * @ub: UDP bearer instance
264 * @local: local bearer IP address/port
265 * @remote: peer or multicast IP/port
266 */
267static int parse_options(struct nlattr *attrs[], struct udp_bearer *ub,
268 struct udp_media_addr *local,
269 struct udp_media_addr *remote)
270{
271 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
272 struct sockaddr_storage sa_local, sa_remote;
273
274 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS])
275 goto err;
276 if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX,
277 attrs[TIPC_NLA_BEARER_UDP_OPTS],
278 tipc_nl_udp_policy))
279 goto err;
280 if (opts[TIPC_NLA_UDP_LOCAL] && opts[TIPC_NLA_UDP_REMOTE]) {
281 nla_memcpy(&sa_local, opts[TIPC_NLA_UDP_LOCAL],
282 sizeof(sa_local));
283 nla_memcpy(&sa_remote, opts[TIPC_NLA_UDP_REMOTE],
284 sizeof(sa_remote));
285 } else {
286err:
287 pr_err("Invalid UDP bearer configuration");
288 return -EINVAL;
289 }
290 if ((sa_local.ss_family & sa_remote.ss_family) == AF_INET) {
291 struct sockaddr_in *ip4;
292
293 ip4 = (struct sockaddr_in *)&sa_local;
294 local->proto = htons(ETH_P_IP);
295 local->udp_port = ip4->sin_port;
296 local->ipv4.s_addr = ip4->sin_addr.s_addr;
297
298 ip4 = (struct sockaddr_in *)&sa_remote;
299 remote->proto = htons(ETH_P_IP);
300 remote->udp_port = ip4->sin_port;
301 remote->ipv4.s_addr = ip4->sin_addr.s_addr;
302 return 0;
303
304#if IS_ENABLED(CONFIG_IPV6)
305 } else if ((sa_local.ss_family & sa_remote.ss_family) == AF_INET6) {
306 int atype;
307 struct sockaddr_in6 *ip6;
308
309 ip6 = (struct sockaddr_in6 *)&sa_local;
310 atype = ipv6_addr_type(&ip6->sin6_addr);
311 if (__ipv6_addr_needs_scope_id(atype) && !ip6->sin6_scope_id)
312 return -EINVAL;
313
314 local->proto = htons(ETH_P_IPV6);
315 local->udp_port = ip6->sin6_port;
316 memcpy(&local->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr));
317 ub->ifindex = ip6->sin6_scope_id;
318
319 ip6 = (struct sockaddr_in6 *)&sa_remote;
320 remote->proto = htons(ETH_P_IPV6);
321 remote->udp_port = ip6->sin6_port;
322 memcpy(&remote->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr));
323 return 0;
324#endif
325 }
326 return -EADDRNOTAVAIL;
327}
328
329/**
330 * tipc_udp_enable - callback to create a new udp bearer instance
331 * @net: network namespace
332 * @b: pointer to generic tipc_bearer
333 * @attrs: netlink bearer configuration
334 *
335 * validate the bearer parameters and initialize the udp bearer
336 * rtnl_lock should be held
337 */
338static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
339 struct nlattr *attrs[])
340{
341 int err = -EINVAL;
342 struct udp_bearer *ub;
343 struct udp_media_addr *remote;
344 struct udp_media_addr local = {0};
345 struct udp_port_cfg udp_conf = {0};
346 struct udp_tunnel_sock_cfg tuncfg = {NULL};
347
348 ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
349 if (!ub)
350 return -ENOMEM;
351
352 remote = (struct udp_media_addr *)&b->bcast_addr.value;
353 memset(remote, 0, sizeof(struct udp_media_addr));
354 err = parse_options(attrs, ub, &local, remote);
355 if (err)
356 goto err;
357
358 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
359 b->bcast_addr.broadcast = 1;
360 rcu_assign_pointer(b->media_ptr, ub);
361 rcu_assign_pointer(ub->bearer, b);
362 tipc_udp_media_addr_set(&b->addr, &local);
363 if (local.proto == htons(ETH_P_IP)) {
364 struct net_device *dev;
365
366 dev = __ip_dev_find(net, local.ipv4.s_addr, false);
367 if (!dev) {
368 err = -ENODEV;
369 goto err;
370 }
371 udp_conf.family = AF_INET;
372 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
373 udp_conf.use_udp_checksums = false;
374 ub->ifindex = dev->ifindex;
375 b->mtu = dev->mtu - sizeof(struct iphdr)
376 - sizeof(struct udphdr);
377#if IS_ENABLED(CONFIG_IPV6)
378 } else if (local.proto == htons(ETH_P_IPV6)) {
379 udp_conf.family = AF_INET6;
380 udp_conf.use_udp6_tx_checksums = true;
381 udp_conf.use_udp6_rx_checksums = true;
382 udp_conf.local_ip6 = in6addr_any;
383 b->mtu = 1280;
384#endif
385 } else {
386 err = -EAFNOSUPPORT;
387 goto err;
388 }
389 udp_conf.local_udp_port = local.udp_port;
390 err = udp_sock_create(net, &udp_conf, &ub->ubsock);
391 if (err)
392 goto err;
393 tuncfg.sk_user_data = ub;
394 tuncfg.encap_type = 1;
395 tuncfg.encap_rcv = tipc_udp_recv;
396 tuncfg.encap_destroy = NULL;
397 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);
398
399 if (enable_mcast(ub, remote))
400 goto err;
401 return 0;
402err:
403 kfree(ub);
404 return err;
405}
406
407/* cleanup_bearer - break the socket/bearer association */
408static void cleanup_bearer(struct work_struct *work)
409{
410 struct udp_bearer *ub = container_of(work, struct udp_bearer, work);
411
412 if (ub->ubsock)
413 udp_tunnel_sock_release(ub->ubsock);
414 synchronize_net();
415 kfree(ub);
416}
417
418/* tipc_udp_disable - detach bearer from socket */
419static void tipc_udp_disable(struct tipc_bearer *b)
420{
421 struct udp_bearer *ub;
422
423 ub = rcu_dereference_rtnl(b->media_ptr);
424 if (!ub) {
425 pr_err("UDP bearer instance not found\n");
426 return;
427 }
428 if (ub->ubsock)
429 sock_set_flag(ub->ubsock->sk, SOCK_DEAD);
430 RCU_INIT_POINTER(ub->bearer, NULL);
431
432 /* sock_release need to be done outside of rtnl lock */
433 INIT_WORK(&ub->work, cleanup_bearer);
434 schedule_work(&ub->work);
435}
436
437struct tipc_media udp_media_info = {
438 .send_msg = tipc_udp_send_msg,
439 .enable_media = tipc_udp_enable,
440 .disable_media = tipc_udp_disable,
441 .addr2str = tipc_udp_addr2str,
442 .addr2msg = tipc_udp_addr2msg,
443 .msg2addr = tipc_udp_msg2addr,
444 .priority = TIPC_DEF_LINK_PRI,
445 .tolerance = TIPC_DEF_LINK_TOL,
446 .window = TIPC_DEF_LINK_WIN,
447 .type_id = TIPC_MEDIA_TYPE_UDP,
448 .hwaddr_len = 0,
449 .name = "udp"
450};