Commit | Line | Data |
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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" | |
52dfae5c JM |
50 | #include "addr.h" |
51 | #include "net.h" | |
d0f91938 | 52 | #include "bearer.h" |
49cc66ea | 53 | #include "netlink.h" |
ef20cd4d | 54 | #include "msg.h" |
d0f91938 EH |
55 | |
56 | /* IANA assigned UDP port */ | |
57 | #define UDP_PORT_DEFAULT 6118 | |
58 | ||
9bd160bf | 59 | #define UDP_MIN_HEADROOM 48 |
e5356794 | 60 | |
d0f91938 EH |
61 | /** |
62 | * struct udp_media_addr - IP/UDP addressing information | |
63 | * | |
64 | * This is the bearer level originating address used in neighbor discovery | |
65 | * messages, and all fields should be in network byte order | |
66 | */ | |
67 | struct udp_media_addr { | |
68 | __be16 proto; | |
bc3a334c | 69 | __be16 port; |
d0f91938 EH |
70 | union { |
71 | struct in_addr ipv4; | |
72 | struct in6_addr ipv6; | |
73 | }; | |
74 | }; | |
75 | ||
ef20cd4d RA |
76 | /* struct udp_replicast - container for UDP remote addresses */ |
77 | struct udp_replicast { | |
78 | struct udp_media_addr addr; | |
79 | struct rcu_head rcu; | |
80 | struct list_head list; | |
81 | }; | |
82 | ||
d0f91938 EH |
83 | /** |
84 | * struct udp_bearer - ip/udp bearer data structure | |
85 | * @bearer: associated generic tipc bearer | |
86 | * @ubsock: bearer associated socket | |
87 | * @ifindex: local address scope | |
88 | * @work: used to schedule deferred work on a bearer | |
89 | */ | |
90 | struct udp_bearer { | |
91 | struct tipc_bearer __rcu *bearer; | |
92 | struct socket *ubsock; | |
93 | u32 ifindex; | |
94 | struct work_struct work; | |
ef20cd4d | 95 | struct udp_replicast rcast; |
d0f91938 EH |
96 | }; |
97 | ||
1ca73e3f RA |
98 | static int tipc_udp_is_mcast_addr(struct udp_media_addr *addr) |
99 | { | |
100 | if (ntohs(addr->proto) == ETH_P_IP) | |
101 | return ipv4_is_multicast(addr->ipv4.s_addr); | |
102 | #if IS_ENABLED(CONFIG_IPV6) | |
103 | else | |
104 | return ipv6_addr_is_multicast(&addr->ipv6); | |
105 | #endif | |
106 | return 0; | |
107 | } | |
108 | ||
d0f91938 EH |
109 | /* udp_media_addr_set - convert a ip/udp address to a TIPC media address */ |
110 | static void tipc_udp_media_addr_set(struct tipc_media_addr *addr, | |
111 | struct udp_media_addr *ua) | |
112 | { | |
113 | memset(addr, 0, sizeof(struct tipc_media_addr)); | |
114 | addr->media_id = TIPC_MEDIA_TYPE_UDP; | |
115 | memcpy(addr->value, ua, sizeof(struct udp_media_addr)); | |
1ca73e3f RA |
116 | |
117 | if (tipc_udp_is_mcast_addr(ua)) | |
9999974a | 118 | addr->broadcast = TIPC_BROADCAST_SUPPORT; |
d0f91938 EH |
119 | } |
120 | ||
121 | /* tipc_udp_addr2str - convert ip/udp address to string */ | |
122 | static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size) | |
123 | { | |
124 | struct udp_media_addr *ua = (struct udp_media_addr *)&a->value; | |
125 | ||
126 | if (ntohs(ua->proto) == ETH_P_IP) | |
bc3a334c | 127 | snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port)); |
d0f91938 | 128 | else if (ntohs(ua->proto) == ETH_P_IPV6) |
bc3a334c | 129 | snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port)); |
d0f91938 EH |
130 | else |
131 | pr_err("Invalid UDP media address\n"); | |
132 | return 0; | |
133 | } | |
134 | ||
135 | /* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */ | |
136 | static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a, | |
137 | char *msg) | |
138 | { | |
139 | struct udp_media_addr *ua; | |
140 | ||
141 | ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET); | |
142 | if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP) | |
143 | return -EINVAL; | |
144 | tipc_udp_media_addr_set(a, ua); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | /* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */ | |
149 | static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a) | |
150 | { | |
151 | memset(msg, 0, TIPC_MEDIA_INFO_SIZE); | |
152 | msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP; | |
153 | memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value, | |
154 | sizeof(struct udp_media_addr)); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | /* tipc_send_msg - enqueue a send request */ | |
ce984da3 RA |
159 | static int tipc_udp_xmit(struct net *net, struct sk_buff *skb, |
160 | struct udp_bearer *ub, struct udp_media_addr *src, | |
161 | struct udp_media_addr *dst) | |
d0f91938 EH |
162 | { |
163 | int ttl, err = 0; | |
d0f91938 EH |
164 | struct rtable *rt; |
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, | |
7214bcf8 | 170 | .flowi4_mark = skb->mark, |
d0f91938 EH |
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 | } | |
9b300960 RA |
178 | |
179 | skb->dev = rt->dst.dev; | |
d0f91938 | 180 | ttl = ip4_dst_hoplimit(&rt->dst); |
039f5062 | 181 | udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr, |
bc3a334c RA |
182 | dst->ipv4.s_addr, 0, ttl, 0, src->port, |
183 | dst->port, false, true); | |
d0f91938 EH |
184 | #if IS_ENABLED(CONFIG_IPV6) |
185 | } else { | |
186 | struct dst_entry *ndst; | |
187 | struct flowi6 fl6 = { | |
188 | .flowi6_oif = ub->ifindex, | |
189 | .daddr = dst->ipv6, | |
190 | .saddr = src->ipv6, | |
191 | .flowi6_proto = IPPROTO_UDP | |
192 | }; | |
343d60aa RP |
193 | err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst, |
194 | &fl6); | |
d0f91938 EH |
195 | if (err) |
196 | goto tx_error; | |
197 | ttl = ip6_dst_hoplimit(ndst); | |
7214bcf8 | 198 | err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, |
79b16aad | 199 | ndst->dev, &src->ipv6, |
bc3a334c RA |
200 | &dst->ipv6, 0, ttl, 0, src->port, |
201 | dst->port, false); | |
d0f91938 EH |
202 | #endif |
203 | } | |
204 | return err; | |
205 | ||
206 | tx_error: | |
7214bcf8 | 207 | kfree_skb(skb); |
d0f91938 EH |
208 | return err; |
209 | } | |
210 | ||
ce984da3 RA |
211 | static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb, |
212 | struct tipc_bearer *b, | |
213 | struct tipc_media_addr *addr) | |
214 | { | |
215 | struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; | |
216 | struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value; | |
ef20cd4d | 217 | struct udp_replicast *rcast; |
ce984da3 RA |
218 | struct udp_bearer *ub; |
219 | int err = 0; | |
220 | ||
221 | if (skb_headroom(skb) < UDP_MIN_HEADROOM) { | |
222 | err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC); | |
223 | if (err) | |
ef20cd4d | 224 | goto out; |
ce984da3 RA |
225 | } |
226 | ||
227 | skb_set_inner_protocol(skb, htons(ETH_P_TIPC)); | |
228 | ub = rcu_dereference_rtnl(b->media_ptr); | |
229 | if (!ub) { | |
230 | err = -ENODEV; | |
ef20cd4d | 231 | goto out; |
ce984da3 RA |
232 | } |
233 | ||
9999974a | 234 | if (addr->broadcast != TIPC_REPLICAST_SUPPORT) |
ef20cd4d | 235 | return tipc_udp_xmit(net, skb, ub, src, dst); |
ce984da3 | 236 | |
ef20cd4d RA |
237 | /* Replicast, send an skb to each configured IP address */ |
238 | list_for_each_entry_rcu(rcast, &ub->rcast.list, list) { | |
239 | struct sk_buff *_skb; | |
240 | ||
241 | _skb = pskb_copy(skb, GFP_ATOMIC); | |
242 | if (!_skb) { | |
243 | err = -ENOMEM; | |
244 | goto out; | |
245 | } | |
246 | ||
247 | err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr); | |
248 | if (err) { | |
249 | kfree_skb(_skb); | |
250 | goto out; | |
251 | } | |
252 | } | |
253 | err = 0; | |
254 | out: | |
ce984da3 RA |
255 | kfree_skb(skb); |
256 | return err; | |
257 | } | |
258 | ||
c9b64d49 RA |
259 | static bool tipc_udp_is_known_peer(struct tipc_bearer *b, |
260 | struct udp_media_addr *addr) | |
261 | { | |
262 | struct udp_replicast *rcast, *tmp; | |
263 | struct udp_bearer *ub; | |
264 | ||
265 | ub = rcu_dereference_rtnl(b->media_ptr); | |
266 | if (!ub) { | |
267 | pr_err_ratelimited("UDP bearer instance not found\n"); | |
268 | return false; | |
269 | } | |
270 | ||
271 | list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { | |
272 | if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr))) | |
273 | return true; | |
274 | } | |
275 | ||
276 | return false; | |
277 | } | |
278 | ||
ef20cd4d RA |
279 | static int tipc_udp_rcast_add(struct tipc_bearer *b, |
280 | struct udp_media_addr *addr) | |
281 | { | |
282 | struct udp_replicast *rcast; | |
283 | struct udp_bearer *ub; | |
284 | ||
285 | ub = rcu_dereference_rtnl(b->media_ptr); | |
286 | if (!ub) | |
287 | return -ENODEV; | |
288 | ||
289 | rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC); | |
290 | if (!rcast) | |
291 | return -ENOMEM; | |
292 | ||
293 | memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr)); | |
294 | ||
295 | if (ntohs(addr->proto) == ETH_P_IP) | |
296 | pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4); | |
297 | #if IS_ENABLED(CONFIG_IPV6) | |
298 | else if (ntohs(addr->proto) == ETH_P_IPV6) | |
299 | pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6); | |
300 | #endif | |
9999974a | 301 | b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT; |
ef20cd4d RA |
302 | list_add_rcu(&rcast->list, &ub->rcast.list); |
303 | return 0; | |
304 | } | |
305 | ||
c9b64d49 RA |
306 | static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb) |
307 | { | |
308 | struct udp_media_addr src = {0}; | |
309 | struct udp_media_addr *dst; | |
310 | ||
311 | dst = (struct udp_media_addr *)&b->bcast_addr.value; | |
312 | if (tipc_udp_is_mcast_addr(dst)) | |
313 | return 0; | |
314 | ||
315 | src.port = udp_hdr(skb)->source; | |
316 | ||
317 | if (ip_hdr(skb)->version == 4) { | |
318 | struct iphdr *iphdr = ip_hdr(skb); | |
319 | ||
320 | src.proto = htons(ETH_P_IP); | |
321 | src.ipv4.s_addr = iphdr->saddr; | |
322 | if (ipv4_is_multicast(iphdr->daddr)) | |
323 | return 0; | |
324 | #if IS_ENABLED(CONFIG_IPV6) | |
325 | } else if (ip_hdr(skb)->version == 6) { | |
326 | struct ipv6hdr *iphdr = ipv6_hdr(skb); | |
327 | ||
328 | src.proto = htons(ETH_P_IPV6); | |
329 | src.ipv6 = iphdr->saddr; | |
330 | if (ipv6_addr_is_multicast(&iphdr->daddr)) | |
331 | return 0; | |
332 | #endif | |
333 | } else { | |
334 | return 0; | |
335 | } | |
336 | ||
337 | if (likely(tipc_udp_is_known_peer(b, &src))) | |
338 | return 0; | |
339 | ||
340 | return tipc_udp_rcast_add(b, &src); | |
341 | } | |
342 | ||
d0f91938 EH |
343 | /* tipc_udp_recv - read data from bearer socket */ |
344 | static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb) | |
345 | { | |
346 | struct udp_bearer *ub; | |
347 | struct tipc_bearer *b; | |
c9b64d49 RA |
348 | struct tipc_msg *hdr; |
349 | int err; | |
d0f91938 EH |
350 | |
351 | ub = rcu_dereference_sk_user_data(sk); | |
352 | if (!ub) { | |
353 | pr_err_ratelimited("Failed to get UDP bearer reference"); | |
c9b64d49 | 354 | goto out; |
d0f91938 | 355 | } |
d0f91938 | 356 | skb_pull(skb, sizeof(struct udphdr)); |
c9b64d49 RA |
357 | hdr = buf_msg(skb); |
358 | ||
d0f91938 EH |
359 | rcu_read_lock(); |
360 | b = rcu_dereference_rtnl(ub->bearer); | |
c9b64d49 RA |
361 | if (!b) |
362 | goto rcu_out; | |
d0f91938 | 363 | |
0d051bf9 | 364 | if (b && test_bit(0, &b->up)) { |
d0f91938 EH |
365 | tipc_rcv(sock_net(sk), skb, b); |
366 | rcu_read_unlock(); | |
367 | return 0; | |
368 | } | |
c9b64d49 RA |
369 | |
370 | if (unlikely(msg_user(hdr) == LINK_CONFIG)) { | |
371 | err = tipc_udp_rcast_disc(b, skb); | |
372 | if (err) | |
373 | goto rcu_out; | |
374 | } | |
375 | ||
c9b64d49 RA |
376 | rcu_out: |
377 | rcu_read_unlock(); | |
378 | out: | |
d0f91938 EH |
379 | kfree_skb(skb); |
380 | return 0; | |
381 | } | |
382 | ||
383 | static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) | |
384 | { | |
385 | int err = 0; | |
386 | struct ip_mreqn mreqn; | |
387 | struct sock *sk = ub->ubsock->sk; | |
388 | ||
389 | if (ntohs(remote->proto) == ETH_P_IP) { | |
d0f91938 EH |
390 | mreqn.imr_multiaddr = remote->ipv4; |
391 | mreqn.imr_ifindex = ub->ifindex; | |
54ff9ef3 | 392 | err = ip_mc_join_group(sk, &mreqn); |
446981e5 | 393 | #if IS_ENABLED(CONFIG_IPV6) |
d0f91938 | 394 | } else { |
446981e5 MRL |
395 | err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex, |
396 | &remote->ipv6); | |
397 | #endif | |
d0f91938 EH |
398 | } |
399 | return err; | |
400 | } | |
401 | ||
fdb3accc RA |
402 | static int __tipc_nl_add_udp_addr(struct sk_buff *skb, |
403 | struct udp_media_addr *addr, int nla_t) | |
404 | { | |
405 | if (ntohs(addr->proto) == ETH_P_IP) { | |
406 | struct sockaddr_in ip4; | |
407 | ||
73076162 | 408 | memset(&ip4, 0, sizeof(ip4)); |
fdb3accc RA |
409 | ip4.sin_family = AF_INET; |
410 | ip4.sin_port = addr->port; | |
411 | ip4.sin_addr.s_addr = addr->ipv4.s_addr; | |
412 | if (nla_put(skb, nla_t, sizeof(ip4), &ip4)) | |
413 | return -EMSGSIZE; | |
414 | ||
415 | #if IS_ENABLED(CONFIG_IPV6) | |
416 | } else if (ntohs(addr->proto) == ETH_P_IPV6) { | |
417 | struct sockaddr_in6 ip6; | |
418 | ||
73076162 | 419 | memset(&ip6, 0, sizeof(ip6)); |
fdb3accc RA |
420 | ip6.sin6_family = AF_INET6; |
421 | ip6.sin6_port = addr->port; | |
422 | memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr)); | |
423 | if (nla_put(skb, nla_t, sizeof(ip6), &ip6)) | |
424 | return -EMSGSIZE; | |
425 | #endif | |
426 | } | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
832629ca RA |
431 | int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb) |
432 | { | |
433 | u32 bid = cb->args[0]; | |
434 | u32 skip_cnt = cb->args[1]; | |
435 | u32 portid = NETLINK_CB(cb->skb).portid; | |
436 | struct udp_replicast *rcast, *tmp; | |
437 | struct tipc_bearer *b; | |
438 | struct udp_bearer *ub; | |
439 | void *hdr; | |
440 | int err; | |
441 | int i; | |
442 | ||
443 | if (!bid && !skip_cnt) { | |
444 | struct net *net = sock_net(skb->sk); | |
445 | struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1]; | |
446 | struct nlattr **attrs; | |
447 | char *bname; | |
448 | ||
449 | err = tipc_nlmsg_parse(cb->nlh, &attrs); | |
450 | if (err) | |
451 | return err; | |
452 | ||
453 | if (!attrs[TIPC_NLA_BEARER]) | |
454 | return -EINVAL; | |
455 | ||
456 | err = nla_parse_nested(battrs, TIPC_NLA_BEARER_MAX, | |
457 | attrs[TIPC_NLA_BEARER], | |
fceb6435 | 458 | tipc_nl_bearer_policy, NULL); |
832629ca RA |
459 | if (err) |
460 | return err; | |
461 | ||
462 | if (!battrs[TIPC_NLA_BEARER_NAME]) | |
463 | return -EINVAL; | |
464 | ||
465 | bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]); | |
466 | ||
467 | rtnl_lock(); | |
468 | b = tipc_bearer_find(net, bname); | |
469 | if (!b) { | |
470 | rtnl_unlock(); | |
471 | return -EINVAL; | |
472 | } | |
473 | bid = b->identity; | |
474 | } else { | |
475 | struct net *net = sock_net(skb->sk); | |
476 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
477 | ||
478 | rtnl_lock(); | |
479 | b = rtnl_dereference(tn->bearer_list[bid]); | |
480 | if (!b) { | |
481 | rtnl_unlock(); | |
482 | return -EINVAL; | |
483 | } | |
484 | } | |
485 | ||
486 | ub = rcu_dereference_rtnl(b->media_ptr); | |
487 | if (!ub) { | |
488 | rtnl_unlock(); | |
489 | return -EINVAL; | |
490 | } | |
491 | ||
492 | i = 0; | |
493 | list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { | |
494 | if (i < skip_cnt) | |
495 | goto count; | |
496 | ||
497 | hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq, | |
498 | &tipc_genl_family, NLM_F_MULTI, | |
499 | TIPC_NL_BEARER_GET); | |
500 | if (!hdr) | |
501 | goto done; | |
502 | ||
503 | err = __tipc_nl_add_udp_addr(skb, &rcast->addr, | |
504 | TIPC_NLA_UDP_REMOTE); | |
505 | if (err) { | |
506 | genlmsg_cancel(skb, hdr); | |
507 | goto done; | |
508 | } | |
509 | genlmsg_end(skb, hdr); | |
510 | count: | |
511 | i++; | |
512 | } | |
513 | done: | |
514 | rtnl_unlock(); | |
515 | cb->args[0] = bid; | |
516 | cb->args[1] = i; | |
517 | ||
518 | return skb->len; | |
519 | } | |
520 | ||
fdb3accc RA |
521 | int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b) |
522 | { | |
523 | struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; | |
524 | struct udp_media_addr *dst; | |
525 | struct udp_bearer *ub; | |
526 | struct nlattr *nest; | |
527 | ||
528 | ub = rcu_dereference_rtnl(b->media_ptr); | |
529 | if (!ub) | |
530 | return -ENODEV; | |
531 | ||
532 | nest = nla_nest_start(msg->skb, TIPC_NLA_BEARER_UDP_OPTS); | |
533 | if (!nest) | |
534 | goto msg_full; | |
535 | ||
536 | if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL)) | |
537 | goto msg_full; | |
538 | ||
539 | dst = (struct udp_media_addr *)&b->bcast_addr.value; | |
540 | if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE)) | |
541 | goto msg_full; | |
542 | ||
543 | if (!list_empty(&ub->rcast.list)) { | |
544 | if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP)) | |
545 | goto msg_full; | |
546 | } | |
547 | ||
548 | nla_nest_end(msg->skb, nest); | |
549 | return 0; | |
550 | msg_full: | |
551 | nla_nest_cancel(msg->skb, nest); | |
552 | return -EMSGSIZE; | |
553 | } | |
554 | ||
d0f91938 | 555 | /** |
ba5aa84a RA |
556 | * tipc_parse_udp_addr - build udp media address from netlink data |
557 | * @nlattr: netlink attribute containing sockaddr storage aligned address | |
558 | * @addr: tipc media address to fill with address, port and protocol type | |
559 | * @scope_id: IPv6 scope id pointer, not NULL indicates it's required | |
d0f91938 | 560 | */ |
ba5aa84a RA |
561 | |
562 | static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr, | |
563 | u32 *scope_id) | |
d0f91938 | 564 | { |
ba5aa84a | 565 | struct sockaddr_storage sa; |
d0f91938 | 566 | |
ba5aa84a RA |
567 | nla_memcpy(&sa, nla, sizeof(sa)); |
568 | if (sa.ss_family == AF_INET) { | |
569 | struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa; | |
570 | ||
571 | addr->proto = htons(ETH_P_IP); | |
572 | addr->port = ip4->sin_port; | |
573 | addr->ipv4.s_addr = ip4->sin_addr.s_addr; | |
d0f91938 EH |
574 | return 0; |
575 | ||
576 | #if IS_ENABLED(CONFIG_IPV6) | |
ba5aa84a RA |
577 | } else if (sa.ss_family == AF_INET6) { |
578 | struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa; | |
579 | ||
580 | addr->proto = htons(ETH_P_IPV6); | |
581 | addr->port = ip6->sin6_port; | |
582 | memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr)); | |
583 | ||
584 | /* Scope ID is only interesting for local addresses */ | |
585 | if (scope_id) { | |
586 | int atype; | |
587 | ||
588 | atype = ipv6_addr_type(&ip6->sin6_addr); | |
589 | if (__ipv6_addr_needs_scope_id(atype) && | |
590 | !ip6->sin6_scope_id) { | |
591 | return -EINVAL; | |
592 | } | |
593 | ||
594 | *scope_id = ip6->sin6_scope_id ? : 0; | |
595 | } | |
596 | ||
d0f91938 EH |
597 | return 0; |
598 | #endif | |
599 | } | |
600 | return -EADDRNOTAVAIL; | |
601 | } | |
602 | ||
ef20cd4d RA |
603 | int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr) |
604 | { | |
605 | int err; | |
606 | struct udp_media_addr addr = {0}; | |
607 | struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; | |
608 | struct udp_media_addr *dst; | |
609 | ||
fceb6435 JB |
610 | if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, attr, |
611 | tipc_nl_udp_policy, NULL)) | |
ef20cd4d RA |
612 | return -EINVAL; |
613 | ||
614 | if (!opts[TIPC_NLA_UDP_REMOTE]) | |
615 | return -EINVAL; | |
616 | ||
617 | err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL); | |
618 | if (err) | |
619 | return err; | |
620 | ||
621 | dst = (struct udp_media_addr *)&b->bcast_addr.value; | |
622 | if (tipc_udp_is_mcast_addr(dst)) { | |
623 | pr_err("Can't add remote ip to TIPC UDP multicast bearer\n"); | |
624 | return -EINVAL; | |
625 | } | |
626 | ||
c9b64d49 RA |
627 | if (tipc_udp_is_known_peer(b, &addr)) |
628 | return 0; | |
629 | ||
ef20cd4d RA |
630 | return tipc_udp_rcast_add(b, &addr); |
631 | } | |
632 | ||
d0f91938 EH |
633 | /** |
634 | * tipc_udp_enable - callback to create a new udp bearer instance | |
635 | * @net: network namespace | |
636 | * @b: pointer to generic tipc_bearer | |
637 | * @attrs: netlink bearer configuration | |
638 | * | |
639 | * validate the bearer parameters and initialize the udp bearer | |
640 | * rtnl_lock should be held | |
641 | */ | |
642 | static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, | |
643 | struct nlattr *attrs[]) | |
644 | { | |
645 | int err = -EINVAL; | |
646 | struct udp_bearer *ub; | |
ef20cd4d | 647 | struct udp_media_addr remote = {0}; |
d0f91938 EH |
648 | struct udp_media_addr local = {0}; |
649 | struct udp_port_cfg udp_conf = {0}; | |
4fee6be8 | 650 | struct udp_tunnel_sock_cfg tuncfg = {NULL}; |
ba5aa84a | 651 | struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; |
52dfae5c | 652 | u8 node_id[NODE_ID_LEN] = {0,}; |
d0f91938 EH |
653 | |
654 | ub = kzalloc(sizeof(*ub), GFP_ATOMIC); | |
655 | if (!ub) | |
656 | return -ENOMEM; | |
657 | ||
ef20cd4d RA |
658 | INIT_LIST_HEAD(&ub->rcast.list); |
659 | ||
ba5aa84a RA |
660 | if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) |
661 | goto err; | |
662 | ||
663 | if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, | |
664 | attrs[TIPC_NLA_BEARER_UDP_OPTS], | |
fceb6435 | 665 | tipc_nl_udp_policy, NULL)) |
ba5aa84a RA |
666 | goto err; |
667 | ||
668 | if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) { | |
669 | pr_err("Invalid UDP bearer configuration"); | |
c20cb811 WY |
670 | err = -EINVAL; |
671 | goto err; | |
ba5aa84a RA |
672 | } |
673 | ||
674 | err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local, | |
675 | &ub->ifindex); | |
676 | if (err) | |
677 | goto err; | |
678 | ||
ef20cd4d | 679 | err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL); |
d0f91938 EH |
680 | if (err) |
681 | goto err; | |
682 | ||
52dfae5c JM |
683 | /* Autoconfigure own node identity if needed */ |
684 | if (!tipc_own_id(net)) { | |
685 | memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16); | |
686 | tipc_net_init(net, node_id, 0); | |
687 | } | |
688 | if (!tipc_own_id(net)) { | |
689 | pr_warn("Failed to set node id, please configure manually\n"); | |
c76f2481 WY |
690 | err = -EINVAL; |
691 | goto err; | |
52dfae5c JM |
692 | } |
693 | ||
d0f91938 | 694 | b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; |
9999974a | 695 | b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; |
d0f91938 EH |
696 | rcu_assign_pointer(b->media_ptr, ub); |
697 | rcu_assign_pointer(ub->bearer, b); | |
698 | tipc_udp_media_addr_set(&b->addr, &local); | |
4fee6be8 | 699 | if (local.proto == htons(ETH_P_IP)) { |
d0f91938 EH |
700 | struct net_device *dev; |
701 | ||
702 | dev = __ip_dev_find(net, local.ipv4.s_addr, false); | |
703 | if (!dev) { | |
704 | err = -ENODEV; | |
705 | goto err; | |
706 | } | |
707 | udp_conf.family = AF_INET; | |
708 | udp_conf.local_ip.s_addr = htonl(INADDR_ANY); | |
709 | udp_conf.use_udp_checksums = false; | |
710 | ub->ifindex = dev->ifindex; | |
3de81b75 MK |
711 | if (tipc_mtu_bad(dev, sizeof(struct iphdr) + |
712 | sizeof(struct udphdr))) { | |
713 | err = -EINVAL; | |
714 | goto err; | |
715 | } | |
d0f91938 EH |
716 | b->mtu = dev->mtu - sizeof(struct iphdr) |
717 | - sizeof(struct udphdr); | |
718 | #if IS_ENABLED(CONFIG_IPV6) | |
4fee6be8 | 719 | } else if (local.proto == htons(ETH_P_IPV6)) { |
d0f91938 EH |
720 | udp_conf.family = AF_INET6; |
721 | udp_conf.use_udp6_tx_checksums = true; | |
722 | udp_conf.use_udp6_rx_checksums = true; | |
723 | udp_conf.local_ip6 = in6addr_any; | |
724 | b->mtu = 1280; | |
725 | #endif | |
726 | } else { | |
727 | err = -EAFNOSUPPORT; | |
728 | goto err; | |
729 | } | |
bc3a334c | 730 | udp_conf.local_udp_port = local.port; |
d0f91938 EH |
731 | err = udp_sock_create(net, &udp_conf, &ub->ubsock); |
732 | if (err) | |
733 | goto err; | |
734 | tuncfg.sk_user_data = ub; | |
735 | tuncfg.encap_type = 1; | |
736 | tuncfg.encap_rcv = tipc_udp_recv; | |
737 | tuncfg.encap_destroy = NULL; | |
738 | setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg); | |
739 | ||
ef20cd4d RA |
740 | /** |
741 | * The bcast media address port is used for all peers and the ip | |
742 | * is used if it's a multicast address. | |
743 | */ | |
744 | memcpy(&b->bcast_addr.value, &remote, sizeof(remote)); | |
745 | if (tipc_udp_is_mcast_addr(&remote)) | |
746 | err = enable_mcast(ub, &remote); | |
747 | else | |
748 | err = tipc_udp_rcast_add(b, &remote); | |
749 | if (err) | |
750 | goto err; | |
1ca73e3f | 751 | |
d0f91938 EH |
752 | return 0; |
753 | err: | |
a5de125d WY |
754 | if (ub->ubsock) |
755 | udp_tunnel_sock_release(ub->ubsock); | |
d0f91938 EH |
756 | kfree(ub); |
757 | return err; | |
758 | } | |
759 | ||
760 | /* cleanup_bearer - break the socket/bearer association */ | |
761 | static void cleanup_bearer(struct work_struct *work) | |
762 | { | |
763 | struct udp_bearer *ub = container_of(work, struct udp_bearer, work); | |
ef20cd4d RA |
764 | struct udp_replicast *rcast, *tmp; |
765 | ||
766 | list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { | |
767 | list_del_rcu(&rcast->list); | |
768 | kfree_rcu(rcast, rcu); | |
769 | } | |
d0f91938 EH |
770 | |
771 | if (ub->ubsock) | |
772 | udp_tunnel_sock_release(ub->ubsock); | |
773 | synchronize_net(); | |
774 | kfree(ub); | |
775 | } | |
776 | ||
777 | /* tipc_udp_disable - detach bearer from socket */ | |
778 | static void tipc_udp_disable(struct tipc_bearer *b) | |
779 | { | |
780 | struct udp_bearer *ub; | |
781 | ||
782 | ub = rcu_dereference_rtnl(b->media_ptr); | |
783 | if (!ub) { | |
784 | pr_err("UDP bearer instance not found\n"); | |
785 | return; | |
786 | } | |
787 | if (ub->ubsock) | |
788 | sock_set_flag(ub->ubsock->sk, SOCK_DEAD); | |
d0f91938 EH |
789 | RCU_INIT_POINTER(ub->bearer, NULL); |
790 | ||
791 | /* sock_release need to be done outside of rtnl lock */ | |
792 | INIT_WORK(&ub->work, cleanup_bearer); | |
793 | schedule_work(&ub->work); | |
794 | } | |
795 | ||
796 | struct tipc_media udp_media_info = { | |
797 | .send_msg = tipc_udp_send_msg, | |
798 | .enable_media = tipc_udp_enable, | |
799 | .disable_media = tipc_udp_disable, | |
800 | .addr2str = tipc_udp_addr2str, | |
801 | .addr2msg = tipc_udp_addr2msg, | |
802 | .msg2addr = tipc_udp_msg2addr, | |
803 | .priority = TIPC_DEF_LINK_PRI, | |
804 | .tolerance = TIPC_DEF_LINK_TOL, | |
805 | .window = TIPC_DEF_LINK_WIN, | |
806 | .type_id = TIPC_MEDIA_TYPE_UDP, | |
807 | .hwaddr_len = 0, | |
808 | .name = "udp" | |
809 | }; |