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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 | ||
e5356794 JPM |
55 | #define UDP_MIN_HEADROOM 28 |
56 | ||
d0f91938 EH |
57 | static const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = { |
58 | [TIPC_NLA_UDP_UNSPEC] = {.type = NLA_UNSPEC}, | |
59 | [TIPC_NLA_UDP_LOCAL] = {.type = NLA_BINARY, | |
60 | .len = sizeof(struct sockaddr_storage)}, | |
61 | [TIPC_NLA_UDP_REMOTE] = {.type = NLA_BINARY, | |
62 | .len = sizeof(struct sockaddr_storage)}, | |
63 | }; | |
64 | ||
65 | /** | |
66 | * struct udp_media_addr - IP/UDP addressing information | |
67 | * | |
68 | * This is the bearer level originating address used in neighbor discovery | |
69 | * messages, and all fields should be in network byte order | |
70 | */ | |
71 | struct udp_media_addr { | |
72 | __be16 proto; | |
73 | __be16 udp_port; | |
74 | union { | |
75 | struct in_addr ipv4; | |
76 | struct in6_addr ipv6; | |
77 | }; | |
78 | }; | |
79 | ||
80 | /** | |
81 | * struct udp_bearer - ip/udp bearer data structure | |
82 | * @bearer: associated generic tipc bearer | |
83 | * @ubsock: bearer associated socket | |
84 | * @ifindex: local address scope | |
85 | * @work: used to schedule deferred work on a bearer | |
86 | */ | |
87 | struct udp_bearer { | |
88 | struct tipc_bearer __rcu *bearer; | |
89 | struct socket *ubsock; | |
90 | u32 ifindex; | |
91 | struct work_struct work; | |
92 | }; | |
93 | ||
94 | /* udp_media_addr_set - convert a ip/udp address to a TIPC media address */ | |
95 | static void tipc_udp_media_addr_set(struct tipc_media_addr *addr, | |
96 | struct udp_media_addr *ua) | |
97 | { | |
98 | memset(addr, 0, sizeof(struct tipc_media_addr)); | |
99 | addr->media_id = TIPC_MEDIA_TYPE_UDP; | |
100 | memcpy(addr->value, ua, sizeof(struct udp_media_addr)); | |
101 | if (ntohs(ua->proto) == ETH_P_IP) { | |
102 | if (ipv4_is_multicast(ua->ipv4.s_addr)) | |
103 | addr->broadcast = 1; | |
104 | } else if (ntohs(ua->proto) == ETH_P_IPV6) { | |
105 | if (ipv6_addr_type(&ua->ipv6) & IPV6_ADDR_MULTICAST) | |
106 | addr->broadcast = 1; | |
107 | } else { | |
108 | pr_err("Invalid UDP media address\n"); | |
109 | } | |
110 | } | |
111 | ||
112 | /* tipc_udp_addr2str - convert ip/udp address to string */ | |
113 | static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size) | |
114 | { | |
115 | struct udp_media_addr *ua = (struct udp_media_addr *)&a->value; | |
116 | ||
117 | if (ntohs(ua->proto) == ETH_P_IP) | |
118 | snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->udp_port)); | |
119 | else if (ntohs(ua->proto) == ETH_P_IPV6) | |
120 | snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->udp_port)); | |
121 | else | |
122 | pr_err("Invalid UDP media address\n"); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | /* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */ | |
127 | static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a, | |
128 | char *msg) | |
129 | { | |
130 | struct udp_media_addr *ua; | |
131 | ||
132 | ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET); | |
133 | if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP) | |
134 | return -EINVAL; | |
135 | tipc_udp_media_addr_set(a, ua); | |
136 | return 0; | |
137 | } | |
138 | ||
139 | /* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */ | |
140 | static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a) | |
141 | { | |
142 | memset(msg, 0, TIPC_MEDIA_INFO_SIZE); | |
143 | msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP; | |
144 | memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value, | |
145 | sizeof(struct udp_media_addr)); | |
146 | return 0; | |
147 | } | |
148 | ||
149 | /* tipc_send_msg - enqueue a send request */ | |
150 | static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb, | |
151 | struct tipc_bearer *b, | |
152 | struct tipc_media_addr *dest) | |
153 | { | |
154 | int ttl, err = 0; | |
155 | struct udp_bearer *ub; | |
156 | struct udp_media_addr *dst = (struct udp_media_addr *)&dest->value; | |
157 | struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; | |
d0f91938 EH |
158 | struct rtable *rt; |
159 | ||
7098356b YX |
160 | if (skb_headroom(skb) < UDP_MIN_HEADROOM) { |
161 | err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC); | |
162 | if (err) | |
163 | goto tx_error; | |
164 | } | |
e5356794 | 165 | |
7214bcf8 | 166 | skb_set_inner_protocol(skb, htons(ETH_P_TIPC)); |
d0f91938 EH |
167 | ub = rcu_dereference_rtnl(b->media_ptr); |
168 | if (!ub) { | |
169 | err = -ENODEV; | |
170 | goto tx_error; | |
171 | } | |
4fee6be8 | 172 | if (dst->proto == htons(ETH_P_IP)) { |
d0f91938 EH |
173 | struct flowi4 fl = { |
174 | .daddr = dst->ipv4.s_addr, | |
175 | .saddr = src->ipv4.s_addr, | |
7214bcf8 | 176 | .flowi4_mark = skb->mark, |
d0f91938 EH |
177 | .flowi4_proto = IPPROTO_UDP |
178 | }; | |
179 | rt = ip_route_output_key(net, &fl); | |
180 | if (IS_ERR(rt)) { | |
181 | err = PTR_ERR(rt); | |
182 | goto tx_error; | |
183 | } | |
9b300960 RA |
184 | |
185 | skb->dev = rt->dst.dev; | |
d0f91938 | 186 | ttl = ip4_dst_hoplimit(&rt->dst); |
039f5062 PS |
187 | udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr, |
188 | dst->ipv4.s_addr, 0, ttl, 0, src->udp_port, | |
189 | dst->udp_port, false, true); | |
d0f91938 EH |
190 | #if IS_ENABLED(CONFIG_IPV6) |
191 | } else { | |
192 | struct dst_entry *ndst; | |
193 | struct flowi6 fl6 = { | |
194 | .flowi6_oif = ub->ifindex, | |
195 | .daddr = dst->ipv6, | |
196 | .saddr = src->ipv6, | |
197 | .flowi6_proto = IPPROTO_UDP | |
198 | }; | |
343d60aa RP |
199 | err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst, |
200 | &fl6); | |
d0f91938 EH |
201 | if (err) |
202 | goto tx_error; | |
203 | ttl = ip6_dst_hoplimit(ndst); | |
7214bcf8 | 204 | err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, |
79b16aad | 205 | ndst->dev, &src->ipv6, |
d0f91938 EH |
206 | &dst->ipv6, 0, ttl, src->udp_port, |
207 | dst->udp_port, false); | |
208 | #endif | |
209 | } | |
210 | return err; | |
211 | ||
212 | tx_error: | |
7214bcf8 | 213 | kfree_skb(skb); |
d0f91938 EH |
214 | return err; |
215 | } | |
216 | ||
217 | /* tipc_udp_recv - read data from bearer socket */ | |
218 | static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb) | |
219 | { | |
220 | struct udp_bearer *ub; | |
221 | struct tipc_bearer *b; | |
222 | ||
223 | ub = rcu_dereference_sk_user_data(sk); | |
224 | if (!ub) { | |
225 | pr_err_ratelimited("Failed to get UDP bearer reference"); | |
226 | kfree_skb(skb); | |
227 | return 0; | |
228 | } | |
229 | ||
230 | skb_pull(skb, sizeof(struct udphdr)); | |
231 | rcu_read_lock(); | |
232 | b = rcu_dereference_rtnl(ub->bearer); | |
233 | ||
234 | if (b) { | |
235 | tipc_rcv(sock_net(sk), skb, b); | |
236 | rcu_read_unlock(); | |
237 | return 0; | |
238 | } | |
239 | rcu_read_unlock(); | |
240 | kfree_skb(skb); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) | |
245 | { | |
246 | int err = 0; | |
247 | struct ip_mreqn mreqn; | |
248 | struct sock *sk = ub->ubsock->sk; | |
249 | ||
250 | if (ntohs(remote->proto) == ETH_P_IP) { | |
251 | if (!ipv4_is_multicast(remote->ipv4.s_addr)) | |
252 | return 0; | |
253 | mreqn.imr_multiaddr = remote->ipv4; | |
254 | mreqn.imr_ifindex = ub->ifindex; | |
54ff9ef3 | 255 | err = ip_mc_join_group(sk, &mreqn); |
446981e5 | 256 | #if IS_ENABLED(CONFIG_IPV6) |
d0f91938 EH |
257 | } else { |
258 | if (!ipv6_addr_is_multicast(&remote->ipv6)) | |
259 | return 0; | |
446981e5 MRL |
260 | err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex, |
261 | &remote->ipv6); | |
262 | #endif | |
d0f91938 EH |
263 | } |
264 | return err; | |
265 | } | |
266 | ||
267 | /** | |
268 | * parse_options - build local/remote addresses from configuration | |
269 | * @attrs: netlink config data | |
270 | * @ub: UDP bearer instance | |
271 | * @local: local bearer IP address/port | |
272 | * @remote: peer or multicast IP/port | |
273 | */ | |
274 | static int parse_options(struct nlattr *attrs[], struct udp_bearer *ub, | |
275 | struct udp_media_addr *local, | |
276 | struct udp_media_addr *remote) | |
277 | { | |
278 | struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; | |
ddb37125 | 279 | struct sockaddr_storage sa_local, sa_remote; |
d0f91938 EH |
280 | |
281 | if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) | |
282 | goto err; | |
283 | if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, | |
284 | attrs[TIPC_NLA_BEARER_UDP_OPTS], | |
285 | tipc_nl_udp_policy)) | |
286 | goto err; | |
287 | if (opts[TIPC_NLA_UDP_LOCAL] && opts[TIPC_NLA_UDP_REMOTE]) { | |
ddb37125 RA |
288 | nla_memcpy(&sa_local, opts[TIPC_NLA_UDP_LOCAL], |
289 | sizeof(sa_local)); | |
290 | nla_memcpy(&sa_remote, opts[TIPC_NLA_UDP_REMOTE], | |
291 | sizeof(sa_remote)); | |
d0f91938 EH |
292 | } else { |
293 | err: | |
294 | pr_err("Invalid UDP bearer configuration"); | |
295 | return -EINVAL; | |
296 | } | |
ddb37125 | 297 | if ((sa_local.ss_family & sa_remote.ss_family) == AF_INET) { |
d0f91938 EH |
298 | struct sockaddr_in *ip4; |
299 | ||
ddb37125 | 300 | ip4 = (struct sockaddr_in *)&sa_local; |
d0f91938 EH |
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 | ||
ddb37125 | 305 | ip4 = (struct sockaddr_in *)&sa_remote; |
d0f91938 EH |
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) | |
ddb37125 | 312 | } else if ((sa_local.ss_family & sa_remote.ss_family) == AF_INET6) { |
d0f91938 EH |
313 | struct sockaddr_in6 *ip6; |
314 | ||
ddb37125 | 315 | ip6 = (struct sockaddr_in6 *)&sa_local; |
d0f91938 EH |
316 | local->proto = htons(ETH_P_IPV6); |
317 | local->udp_port = ip6->sin6_port; | |
ddb37125 | 318 | memcpy(&local->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr)); |
d0f91938 EH |
319 | ub->ifindex = ip6->sin6_scope_id; |
320 | ||
ddb37125 | 321 | ip6 = (struct sockaddr_in6 *)&sa_remote; |
d0f91938 EH |
322 | remote->proto = htons(ETH_P_IPV6); |
323 | remote->udp_port = ip6->sin6_port; | |
ddb37125 | 324 | memcpy(&remote->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr)); |
d0f91938 EH |
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 | */ | |
340 | static 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}; | |
4fee6be8 | 348 | struct udp_tunnel_sock_cfg tuncfg = {NULL}; |
d0f91938 EH |
349 | |
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); | |
4fee6be8 | 365 | if (local.proto == htons(ETH_P_IP)) { |
d0f91938 EH |
366 | 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) | |
4fee6be8 | 380 | } else if (local.proto == htons(ETH_P_IPV6)) { |
d0f91938 EH |
381 | 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; | |
404 | err: | |
405 | kfree(ub); | |
406 | return err; | |
407 | } | |
408 | ||
409 | /* cleanup_bearer - break the socket/bearer association */ | |
410 | static 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 */ | |
421 | static 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); | |
d0f91938 EH |
432 | RCU_INIT_POINTER(ub->bearer, NULL); |
433 | ||
434 | /* sock_release need to be done outside of rtnl lock */ | |
435 | INIT_WORK(&ub->work, cleanup_bearer); | |
436 | schedule_work(&ub->work); | |
437 | } | |
438 | ||
439 | struct tipc_media udp_media_info = { | |
440 | .send_msg = tipc_udp_send_msg, | |
441 | .enable_media = tipc_udp_enable, | |
442 | .disable_media = tipc_udp_disable, | |
443 | .addr2str = tipc_udp_addr2str, | |
444 | .addr2msg = tipc_udp_addr2msg, | |
445 | .msg2addr = tipc_udp_msg2addr, | |
446 | .priority = TIPC_DEF_LINK_PRI, | |
447 | .tolerance = TIPC_DEF_LINK_TOL, | |
448 | .window = TIPC_DEF_LINK_WIN, | |
449 | .type_id = TIPC_MEDIA_TYPE_UDP, | |
450 | .hwaddr_len = 0, | |
451 | .name = "udp" | |
452 | }; |