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d0f91938 EH |
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 <linux/tipc_netlink.h> | |
48 | #include "core.h" | |
49 | #include "bearer.h" | |
50 | ||
51 | /* IANA assigned UDP port */ | |
52 | #define UDP_PORT_DEFAULT 6118 | |
53 | ||
54 | static const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = { | |
55 | [TIPC_NLA_UDP_UNSPEC] = {.type = NLA_UNSPEC}, | |
56 | [TIPC_NLA_UDP_LOCAL] = {.type = NLA_BINARY, | |
57 | .len = sizeof(struct sockaddr_storage)}, | |
58 | [TIPC_NLA_UDP_REMOTE] = {.type = NLA_BINARY, | |
59 | .len = sizeof(struct sockaddr_storage)}, | |
60 | }; | |
61 | ||
62 | /** | |
63 | * struct udp_media_addr - IP/UDP addressing information | |
64 | * | |
65 | * This is the bearer level originating address used in neighbor discovery | |
66 | * messages, and all fields should be in network byte order | |
67 | */ | |
68 | struct udp_media_addr { | |
69 | __be16 proto; | |
70 | __be16 udp_port; | |
71 | union { | |
72 | struct in_addr ipv4; | |
73 | struct in6_addr ipv6; | |
74 | }; | |
75 | }; | |
76 | ||
77 | /** | |
78 | * struct udp_bearer - ip/udp bearer data structure | |
79 | * @bearer: associated generic tipc bearer | |
80 | * @ubsock: bearer associated socket | |
81 | * @ifindex: local address scope | |
82 | * @work: used to schedule deferred work on a bearer | |
83 | */ | |
84 | struct udp_bearer { | |
85 | struct tipc_bearer __rcu *bearer; | |
86 | struct socket *ubsock; | |
87 | u32 ifindex; | |
88 | struct work_struct work; | |
89 | }; | |
90 | ||
91 | /* udp_media_addr_set - convert a ip/udp address to a TIPC media address */ | |
92 | static void tipc_udp_media_addr_set(struct tipc_media_addr *addr, | |
93 | struct udp_media_addr *ua) | |
94 | { | |
95 | memset(addr, 0, sizeof(struct tipc_media_addr)); | |
96 | addr->media_id = TIPC_MEDIA_TYPE_UDP; | |
97 | memcpy(addr->value, ua, sizeof(struct udp_media_addr)); | |
98 | if (ntohs(ua->proto) == ETH_P_IP) { | |
99 | if (ipv4_is_multicast(ua->ipv4.s_addr)) | |
100 | addr->broadcast = 1; | |
101 | } else if (ntohs(ua->proto) == ETH_P_IPV6) { | |
102 | if (ipv6_addr_type(&ua->ipv6) & IPV6_ADDR_MULTICAST) | |
103 | addr->broadcast = 1; | |
104 | } else { | |
105 | pr_err("Invalid UDP media address\n"); | |
106 | } | |
107 | } | |
108 | ||
109 | /* tipc_udp_addr2str - convert ip/udp address to string */ | |
110 | static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size) | |
111 | { | |
112 | struct udp_media_addr *ua = (struct udp_media_addr *)&a->value; | |
113 | ||
114 | if (ntohs(ua->proto) == ETH_P_IP) | |
115 | snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->udp_port)); | |
116 | else if (ntohs(ua->proto) == ETH_P_IPV6) | |
117 | snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->udp_port)); | |
118 | else | |
119 | pr_err("Invalid UDP media address\n"); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | /* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */ | |
124 | static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a, | |
125 | char *msg) | |
126 | { | |
127 | struct udp_media_addr *ua; | |
128 | ||
129 | ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET); | |
130 | if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP) | |
131 | return -EINVAL; | |
132 | tipc_udp_media_addr_set(a, ua); | |
133 | return 0; | |
134 | } | |
135 | ||
136 | /* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */ | |
137 | static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a) | |
138 | { | |
139 | memset(msg, 0, TIPC_MEDIA_INFO_SIZE); | |
140 | msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP; | |
141 | memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value, | |
142 | sizeof(struct udp_media_addr)); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | /* tipc_send_msg - enqueue a send request */ | |
147 | static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb, | |
148 | struct tipc_bearer *b, | |
149 | struct tipc_media_addr *dest) | |
150 | { | |
151 | int ttl, err = 0; | |
152 | struct udp_bearer *ub; | |
153 | struct udp_media_addr *dst = (struct udp_media_addr *)&dest->value; | |
154 | struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; | |
155 | struct sk_buff *clone; | |
156 | struct rtable *rt; | |
157 | ||
158 | clone = skb_clone(skb, GFP_ATOMIC); | |
159 | skb_set_inner_protocol(clone, htons(ETH_P_TIPC)); | |
160 | ub = rcu_dereference_rtnl(b->media_ptr); | |
161 | if (!ub) { | |
162 | err = -ENODEV; | |
163 | goto tx_error; | |
164 | } | |
4fee6be8 | 165 | if (dst->proto == htons(ETH_P_IP)) { |
d0f91938 EH |
166 | struct flowi4 fl = { |
167 | .daddr = dst->ipv4.s_addr, | |
168 | .saddr = src->ipv4.s_addr, | |
169 | .flowi4_mark = clone->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 | ttl = ip4_dst_hoplimit(&rt->dst); | |
178 | err = udp_tunnel_xmit_skb(rt, clone, src->ipv4.s_addr, | |
179 | dst->ipv4.s_addr, 0, ttl, 0, | |
180 | src->udp_port, dst->udp_port, | |
181 | false, true); | |
182 | if (err < 0) { | |
183 | ip_rt_put(rt); | |
184 | goto tx_error; | |
185 | } | |
186 | #if IS_ENABLED(CONFIG_IPV6) | |
187 | } else { | |
188 | struct dst_entry *ndst; | |
189 | struct flowi6 fl6 = { | |
190 | .flowi6_oif = ub->ifindex, | |
191 | .daddr = dst->ipv6, | |
192 | .saddr = src->ipv6, | |
193 | .flowi6_proto = IPPROTO_UDP | |
194 | }; | |
195 | err = ip6_dst_lookup(ub->ubsock->sk, &ndst, &fl6); | |
196 | if (err) | |
197 | goto tx_error; | |
198 | ttl = ip6_dst_hoplimit(ndst); | |
199 | err = udp_tunnel6_xmit_skb(ndst, clone, ndst->dev, &src->ipv6, | |
200 | &dst->ipv6, 0, ttl, src->udp_port, | |
201 | dst->udp_port, false); | |
202 | #endif | |
203 | } | |
204 | return err; | |
205 | ||
206 | tx_error: | |
207 | kfree_skb(clone); | |
208 | return err; | |
209 | } | |
210 | ||
211 | /* tipc_udp_recv - read data from bearer socket */ | |
212 | static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb) | |
213 | { | |
214 | struct udp_bearer *ub; | |
215 | struct tipc_bearer *b; | |
216 | ||
217 | ub = rcu_dereference_sk_user_data(sk); | |
218 | if (!ub) { | |
219 | pr_err_ratelimited("Failed to get UDP bearer reference"); | |
220 | kfree_skb(skb); | |
221 | return 0; | |
222 | } | |
223 | ||
224 | skb_pull(skb, sizeof(struct udphdr)); | |
225 | rcu_read_lock(); | |
226 | b = rcu_dereference_rtnl(ub->bearer); | |
227 | ||
228 | if (b) { | |
229 | tipc_rcv(sock_net(sk), skb, b); | |
230 | rcu_read_unlock(); | |
231 | return 0; | |
232 | } | |
233 | rcu_read_unlock(); | |
234 | kfree_skb(skb); | |
235 | return 0; | |
236 | } | |
237 | ||
238 | static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) | |
239 | { | |
240 | int err = 0; | |
241 | struct ip_mreqn mreqn; | |
242 | struct sock *sk = ub->ubsock->sk; | |
243 | ||
244 | if (ntohs(remote->proto) == ETH_P_IP) { | |
245 | if (!ipv4_is_multicast(remote->ipv4.s_addr)) | |
246 | return 0; | |
247 | mreqn.imr_multiaddr = remote->ipv4; | |
248 | mreqn.imr_ifindex = ub->ifindex; | |
54ff9ef3 | 249 | err = ip_mc_join_group(sk, &mreqn); |
d0f91938 EH |
250 | } else { |
251 | if (!ipv6_addr_is_multicast(&remote->ipv6)) | |
252 | return 0; | |
54ff9ef3 | 253 | err = ipv6_sock_mc_join(sk, ub->ifindex, &remote->ipv6); |
d0f91938 EH |
254 | } |
255 | return err; | |
256 | } | |
257 | ||
258 | /** | |
259 | * parse_options - build local/remote addresses from configuration | |
260 | * @attrs: netlink config data | |
261 | * @ub: UDP bearer instance | |
262 | * @local: local bearer IP address/port | |
263 | * @remote: peer or multicast IP/port | |
264 | */ | |
265 | static int parse_options(struct nlattr *attrs[], struct udp_bearer *ub, | |
266 | struct udp_media_addr *local, | |
267 | struct udp_media_addr *remote) | |
268 | { | |
269 | struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; | |
270 | struct sockaddr_storage *sa_local, *sa_remote; | |
271 | ||
272 | if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) | |
273 | goto err; | |
274 | if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, | |
275 | attrs[TIPC_NLA_BEARER_UDP_OPTS], | |
276 | tipc_nl_udp_policy)) | |
277 | goto err; | |
278 | if (opts[TIPC_NLA_UDP_LOCAL] && opts[TIPC_NLA_UDP_REMOTE]) { | |
279 | sa_local = nla_data(opts[TIPC_NLA_UDP_LOCAL]); | |
280 | sa_remote = nla_data(opts[TIPC_NLA_UDP_REMOTE]); | |
281 | } else { | |
282 | err: | |
283 | pr_err("Invalid UDP bearer configuration"); | |
284 | return -EINVAL; | |
285 | } | |
286 | if ((sa_local->ss_family & sa_remote->ss_family) == AF_INET) { | |
287 | struct sockaddr_in *ip4; | |
288 | ||
289 | ip4 = (struct sockaddr_in *)sa_local; | |
290 | local->proto = htons(ETH_P_IP); | |
291 | local->udp_port = ip4->sin_port; | |
292 | local->ipv4.s_addr = ip4->sin_addr.s_addr; | |
293 | ||
294 | ip4 = (struct sockaddr_in *)sa_remote; | |
295 | remote->proto = htons(ETH_P_IP); | |
296 | remote->udp_port = ip4->sin_port; | |
297 | remote->ipv4.s_addr = ip4->sin_addr.s_addr; | |
298 | return 0; | |
299 | ||
300 | #if IS_ENABLED(CONFIG_IPV6) | |
301 | } else if ((sa_local->ss_family & sa_remote->ss_family) == AF_INET6) { | |
302 | struct sockaddr_in6 *ip6; | |
303 | ||
304 | ip6 = (struct sockaddr_in6 *)sa_local; | |
305 | local->proto = htons(ETH_P_IPV6); | |
306 | local->udp_port = ip6->sin6_port; | |
307 | local->ipv6 = ip6->sin6_addr; | |
308 | ub->ifindex = ip6->sin6_scope_id; | |
309 | ||
310 | ip6 = (struct sockaddr_in6 *)sa_remote; | |
311 | remote->proto = htons(ETH_P_IPV6); | |
312 | remote->udp_port = ip6->sin6_port; | |
313 | remote->ipv6 = ip6->sin6_addr; | |
314 | return 0; | |
315 | #endif | |
316 | } | |
317 | return -EADDRNOTAVAIL; | |
318 | } | |
319 | ||
320 | /** | |
321 | * tipc_udp_enable - callback to create a new udp bearer instance | |
322 | * @net: network namespace | |
323 | * @b: pointer to generic tipc_bearer | |
324 | * @attrs: netlink bearer configuration | |
325 | * | |
326 | * validate the bearer parameters and initialize the udp bearer | |
327 | * rtnl_lock should be held | |
328 | */ | |
329 | static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, | |
330 | struct nlattr *attrs[]) | |
331 | { | |
332 | int err = -EINVAL; | |
333 | struct udp_bearer *ub; | |
334 | struct udp_media_addr *remote; | |
335 | struct udp_media_addr local = {0}; | |
336 | struct udp_port_cfg udp_conf = {0}; | |
4fee6be8 | 337 | struct udp_tunnel_sock_cfg tuncfg = {NULL}; |
d0f91938 EH |
338 | |
339 | ub = kzalloc(sizeof(*ub), GFP_ATOMIC); | |
340 | if (!ub) | |
341 | return -ENOMEM; | |
342 | ||
343 | remote = (struct udp_media_addr *)&b->bcast_addr.value; | |
344 | memset(remote, 0, sizeof(struct udp_media_addr)); | |
345 | err = parse_options(attrs, ub, &local, remote); | |
346 | if (err) | |
347 | goto err; | |
348 | ||
349 | b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; | |
350 | b->bcast_addr.broadcast = 1; | |
351 | rcu_assign_pointer(b->media_ptr, ub); | |
352 | rcu_assign_pointer(ub->bearer, b); | |
353 | tipc_udp_media_addr_set(&b->addr, &local); | |
4fee6be8 | 354 | if (local.proto == htons(ETH_P_IP)) { |
d0f91938 EH |
355 | struct net_device *dev; |
356 | ||
357 | dev = __ip_dev_find(net, local.ipv4.s_addr, false); | |
358 | if (!dev) { | |
359 | err = -ENODEV; | |
360 | goto err; | |
361 | } | |
362 | udp_conf.family = AF_INET; | |
363 | udp_conf.local_ip.s_addr = htonl(INADDR_ANY); | |
364 | udp_conf.use_udp_checksums = false; | |
365 | ub->ifindex = dev->ifindex; | |
366 | b->mtu = dev->mtu - sizeof(struct iphdr) | |
367 | - sizeof(struct udphdr); | |
368 | #if IS_ENABLED(CONFIG_IPV6) | |
4fee6be8 | 369 | } else if (local.proto == htons(ETH_P_IPV6)) { |
d0f91938 EH |
370 | udp_conf.family = AF_INET6; |
371 | udp_conf.use_udp6_tx_checksums = true; | |
372 | udp_conf.use_udp6_rx_checksums = true; | |
373 | udp_conf.local_ip6 = in6addr_any; | |
374 | b->mtu = 1280; | |
375 | #endif | |
376 | } else { | |
377 | err = -EAFNOSUPPORT; | |
378 | goto err; | |
379 | } | |
380 | udp_conf.local_udp_port = local.udp_port; | |
381 | err = udp_sock_create(net, &udp_conf, &ub->ubsock); | |
382 | if (err) | |
383 | goto err; | |
384 | tuncfg.sk_user_data = ub; | |
385 | tuncfg.encap_type = 1; | |
386 | tuncfg.encap_rcv = tipc_udp_recv; | |
387 | tuncfg.encap_destroy = NULL; | |
388 | setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg); | |
389 | ||
390 | if (enable_mcast(ub, remote)) | |
391 | goto err; | |
392 | return 0; | |
393 | err: | |
394 | kfree(ub); | |
395 | return err; | |
396 | } | |
397 | ||
398 | /* cleanup_bearer - break the socket/bearer association */ | |
399 | static void cleanup_bearer(struct work_struct *work) | |
400 | { | |
401 | struct udp_bearer *ub = container_of(work, struct udp_bearer, work); | |
402 | ||
403 | if (ub->ubsock) | |
404 | udp_tunnel_sock_release(ub->ubsock); | |
405 | synchronize_net(); | |
406 | kfree(ub); | |
407 | } | |
408 | ||
409 | /* tipc_udp_disable - detach bearer from socket */ | |
410 | static void tipc_udp_disable(struct tipc_bearer *b) | |
411 | { | |
412 | struct udp_bearer *ub; | |
413 | ||
414 | ub = rcu_dereference_rtnl(b->media_ptr); | |
415 | if (!ub) { | |
416 | pr_err("UDP bearer instance not found\n"); | |
417 | return; | |
418 | } | |
419 | if (ub->ubsock) | |
420 | sock_set_flag(ub->ubsock->sk, SOCK_DEAD); | |
421 | RCU_INIT_POINTER(b->media_ptr, NULL); | |
422 | RCU_INIT_POINTER(ub->bearer, NULL); | |
423 | ||
424 | /* sock_release need to be done outside of rtnl lock */ | |
425 | INIT_WORK(&ub->work, cleanup_bearer); | |
426 | schedule_work(&ub->work); | |
427 | } | |
428 | ||
429 | struct tipc_media udp_media_info = { | |
430 | .send_msg = tipc_udp_send_msg, | |
431 | .enable_media = tipc_udp_enable, | |
432 | .disable_media = tipc_udp_disable, | |
433 | .addr2str = tipc_udp_addr2str, | |
434 | .addr2msg = tipc_udp_addr2msg, | |
435 | .msg2addr = tipc_udp_msg2addr, | |
436 | .priority = TIPC_DEF_LINK_PRI, | |
437 | .tolerance = TIPC_DEF_LINK_TOL, | |
438 | .window = TIPC_DEF_LINK_WIN, | |
439 | .type_id = TIPC_MEDIA_TYPE_UDP, | |
440 | .hwaddr_len = 0, | |
441 | .name = "udp" | |
442 | }; |