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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> | |
446981e5 | 47 | #include <net/addrconf.h> |
d0f91938 EH |
48 | #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 | ||
55 | static 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 | */ | |
69 | struct 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 | */ | |
85 | struct 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 */ | |
93 | static 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 */ | |
111 | static 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 */ | |
125 | static 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 */ | |
138 | static 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 */ | |
148 | static 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 | } | |
4fee6be8 | 166 | if (dst->proto == htons(ETH_P_IP)) { |
d0f91938 EH |
167 | 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); | |
79b16aad DM |
179 | err = udp_tunnel_xmit_skb(rt, ub->ubsock->sk, clone, |
180 | src->ipv4.s_addr, | |
d0f91938 EH |
181 | 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 | }; | |
343d60aa RP |
197 | err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst, |
198 | &fl6); | |
d0f91938 EH |
199 | if (err) |
200 | goto tx_error; | |
201 | ttl = ip6_dst_hoplimit(ndst); | |
79b16aad DM |
202 | err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, clone, |
203 | ndst->dev, &src->ipv6, | |
d0f91938 EH |
204 | &dst->ipv6, 0, ttl, src->udp_port, |
205 | dst->udp_port, false); | |
206 | #endif | |
207 | } | |
208 | return err; | |
209 | ||
210 | tx_error: | |
211 | kfree_skb(clone); | |
212 | return err; | |
213 | } | |
214 | ||
215 | /* tipc_udp_recv - read data from bearer socket */ | |
216 | static 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 | ||
242 | static 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; | |
54ff9ef3 | 253 | err = ip_mc_join_group(sk, &mreqn); |
446981e5 | 254 | #if IS_ENABLED(CONFIG_IPV6) |
d0f91938 EH |
255 | } else { |
256 | if (!ipv6_addr_is_multicast(&remote->ipv6)) | |
257 | return 0; | |
446981e5 MRL |
258 | err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex, |
259 | &remote->ipv6); | |
260 | #endif | |
d0f91938 EH |
261 | } |
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 | */ | |
272 | static 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 { | |
289 | err: | |
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 | */ | |
336 | static 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}; | |
4fee6be8 | 344 | struct udp_tunnel_sock_cfg tuncfg = {NULL}; |
d0f91938 EH |
345 | |
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); | |
4fee6be8 | 361 | if (local.proto == htons(ETH_P_IP)) { |
d0f91938 EH |
362 | 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) | |
4fee6be8 | 376 | } else if (local.proto == htons(ETH_P_IPV6)) { |
d0f91938 EH |
377 | 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; | |
400 | err: | |
401 | kfree(ub); | |
402 | return err; | |
403 | } | |
404 | ||
405 | /* cleanup_bearer - break the socket/bearer association */ | |
406 | static 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 */ | |
417 | static 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 | ||
436 | struct 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 | }; |