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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#include "msg.h"
53
54/* IANA assigned UDP port */
55#define UDP_PORT_DEFAULT 6118
56
57#define UDP_MIN_HEADROOM 48
58
59/**
60 * struct udp_media_addr - IP/UDP addressing information
61 *
62 * This is the bearer level originating address used in neighbor discovery
63 * messages, and all fields should be in network byte order
64 */
65struct udp_media_addr {
66 __be16 proto;
67 __be16 port;
68 union {
69 struct in_addr ipv4;
70 struct in6_addr ipv6;
71 };
72};
73
74/* struct udp_replicast - container for UDP remote addresses */
75struct udp_replicast {
76 struct udp_media_addr addr;
77 struct rcu_head rcu;
78 struct list_head list;
79};
80
81/**
82 * struct udp_bearer - ip/udp bearer data structure
83 * @bearer: associated generic tipc bearer
84 * @ubsock: bearer associated socket
85 * @ifindex: local address scope
86 * @work: used to schedule deferred work on a bearer
87 */
88struct udp_bearer {
89 struct tipc_bearer __rcu *bearer;
90 struct socket *ubsock;
91 u32 ifindex;
92 struct work_struct work;
93 struct udp_replicast rcast;
94};
95
96static int tipc_udp_is_mcast_addr(struct udp_media_addr *addr)
97{
98 if (ntohs(addr->proto) == ETH_P_IP)
99 return ipv4_is_multicast(addr->ipv4.s_addr);
100#if IS_ENABLED(CONFIG_IPV6)
101 else
102 return ipv6_addr_is_multicast(&addr->ipv6);
103#endif
104 return 0;
105}
106
107/* udp_media_addr_set - convert a ip/udp address to a TIPC media address */
108static void tipc_udp_media_addr_set(struct tipc_media_addr *addr,
109 struct udp_media_addr *ua)
110{
111 memset(addr, 0, sizeof(struct tipc_media_addr));
112 addr->media_id = TIPC_MEDIA_TYPE_UDP;
113 memcpy(addr->value, ua, sizeof(struct udp_media_addr));
114
115 if (tipc_udp_is_mcast_addr(ua))
116 addr->broadcast = 1;
117}
118
119/* tipc_udp_addr2str - convert ip/udp address to string */
120static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size)
121{
122 struct udp_media_addr *ua = (struct udp_media_addr *)&a->value;
123
124 if (ntohs(ua->proto) == ETH_P_IP)
125 snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port));
126 else if (ntohs(ua->proto) == ETH_P_IPV6)
127 snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port));
128 else
129 pr_err("Invalid UDP media address\n");
130 return 0;
131}
132
133/* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */
134static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a,
135 char *msg)
136{
137 struct udp_media_addr *ua;
138
139 ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET);
140 if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP)
141 return -EINVAL;
142 tipc_udp_media_addr_set(a, ua);
143 return 0;
144}
145
146/* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */
147static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a)
148{
149 memset(msg, 0, TIPC_MEDIA_INFO_SIZE);
150 msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP;
151 memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value,
152 sizeof(struct udp_media_addr));
153 return 0;
154}
155
156/* tipc_send_msg - enqueue a send request */
157static int tipc_udp_xmit(struct net *net, struct sk_buff *skb,
158 struct udp_bearer *ub, struct udp_media_addr *src,
159 struct udp_media_addr *dst)
160{
161 int ttl, err = 0;
162 struct rtable *rt;
163
164 if (dst->proto == htons(ETH_P_IP)) {
165 struct flowi4 fl = {
166 .daddr = dst->ipv4.s_addr,
167 .saddr = src->ipv4.s_addr,
168 .flowi4_mark = skb->mark,
169 .flowi4_proto = IPPROTO_UDP
170 };
171 rt = ip_route_output_key(net, &fl);
172 if (IS_ERR(rt)) {
173 err = PTR_ERR(rt);
174 goto tx_error;
175 }
176
177 skb->dev = rt->dst.dev;
178 ttl = ip4_dst_hoplimit(&rt->dst);
179 udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr,
180 dst->ipv4.s_addr, 0, ttl, 0, src->port,
181 dst->port, false, true);
182#if IS_ENABLED(CONFIG_IPV6)
183 } else {
184 struct dst_entry *ndst;
185 struct flowi6 fl6 = {
186 .flowi6_oif = ub->ifindex,
187 .daddr = dst->ipv6,
188 .saddr = src->ipv6,
189 .flowi6_proto = IPPROTO_UDP
190 };
191 err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst,
192 &fl6);
193 if (err)
194 goto tx_error;
195 ttl = ip6_dst_hoplimit(ndst);
196 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb,
197 ndst->dev, &src->ipv6,
198 &dst->ipv6, 0, ttl, 0, src->port,
199 dst->port, false);
200#endif
201 }
202 return err;
203
204tx_error:
205 kfree_skb(skb);
206 return err;
207}
208
209static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
210 struct tipc_bearer *b,
211 struct tipc_media_addr *addr)
212{
213 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
214 struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value;
215 struct udp_replicast *rcast;
216 struct udp_bearer *ub;
217 int err = 0;
218
219 if (skb_headroom(skb) < UDP_MIN_HEADROOM) {
220 err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC);
221 if (err)
222 goto out;
223 }
224
225 skb_set_inner_protocol(skb, htons(ETH_P_TIPC));
226 ub = rcu_dereference_rtnl(b->media_ptr);
227 if (!ub) {
228 err = -ENODEV;
229 goto out;
230 }
231
232 if (!addr->broadcast || list_empty(&ub->rcast.list))
233 return tipc_udp_xmit(net, skb, ub, src, dst);
234
235 /* Replicast, send an skb to each configured IP address */
236 list_for_each_entry_rcu(rcast, &ub->rcast.list, list) {
237 struct sk_buff *_skb;
238
239 _skb = pskb_copy(skb, GFP_ATOMIC);
240 if (!_skb) {
241 err = -ENOMEM;
242 goto out;
243 }
244
245 err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr);
246 if (err) {
247 kfree_skb(_skb);
248 goto out;
249 }
250 }
251 err = 0;
252out:
253 kfree_skb(skb);
254 return err;
255}
256
257static bool tipc_udp_is_known_peer(struct tipc_bearer *b,
258 struct udp_media_addr *addr)
259{
260 struct udp_replicast *rcast, *tmp;
261 struct udp_bearer *ub;
262
263 ub = rcu_dereference_rtnl(b->media_ptr);
264 if (!ub) {
265 pr_err_ratelimited("UDP bearer instance not found\n");
266 return false;
267 }
268
269 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
270 if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr)))
271 return true;
272 }
273
274 return false;
275}
276
277static int tipc_udp_rcast_add(struct tipc_bearer *b,
278 struct udp_media_addr *addr)
279{
280 struct udp_replicast *rcast;
281 struct udp_bearer *ub;
282
283 ub = rcu_dereference_rtnl(b->media_ptr);
284 if (!ub)
285 return -ENODEV;
286
287 rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC);
288 if (!rcast)
289 return -ENOMEM;
290
291 memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr));
292
293 if (ntohs(addr->proto) == ETH_P_IP)
294 pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4);
295#if IS_ENABLED(CONFIG_IPV6)
296 else if (ntohs(addr->proto) == ETH_P_IPV6)
297 pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6);
298#endif
299
300 list_add_rcu(&rcast->list, &ub->rcast.list);
301 return 0;
302}
303
304static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb)
305{
306 struct udp_media_addr src = {0};
307 struct udp_media_addr *dst;
308
309 dst = (struct udp_media_addr *)&b->bcast_addr.value;
310 if (tipc_udp_is_mcast_addr(dst))
311 return 0;
312
313 src.port = udp_hdr(skb)->source;
314
315 if (ip_hdr(skb)->version == 4) {
316 struct iphdr *iphdr = ip_hdr(skb);
317
318 src.proto = htons(ETH_P_IP);
319 src.ipv4.s_addr = iphdr->saddr;
320 if (ipv4_is_multicast(iphdr->daddr))
321 return 0;
322#if IS_ENABLED(CONFIG_IPV6)
323 } else if (ip_hdr(skb)->version == 6) {
324 struct ipv6hdr *iphdr = ipv6_hdr(skb);
325
326 src.proto = htons(ETH_P_IPV6);
327 src.ipv6 = iphdr->saddr;
328 if (ipv6_addr_is_multicast(&iphdr->daddr))
329 return 0;
330#endif
331 } else {
332 return 0;
333 }
334
335 if (likely(tipc_udp_is_known_peer(b, &src)))
336 return 0;
337
338 return tipc_udp_rcast_add(b, &src);
339}
340
341/* tipc_udp_recv - read data from bearer socket */
342static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb)
343{
344 struct udp_bearer *ub;
345 struct tipc_bearer *b;
346 struct tipc_msg *hdr;
347 int err;
348
349 ub = rcu_dereference_sk_user_data(sk);
350 if (!ub) {
351 pr_err_ratelimited("Failed to get UDP bearer reference");
352 goto out;
353 }
354 skb_pull(skb, sizeof(struct udphdr));
355 hdr = buf_msg(skb);
356
357 rcu_read_lock();
358 b = rcu_dereference_rtnl(ub->bearer);
359 if (!b)
360 goto rcu_out;
361
362 if (b && test_bit(0, &b->up)) {
363 tipc_rcv(sock_net(sk), skb, b);
364 rcu_read_unlock();
365 return 0;
366 }
367
368 if (unlikely(msg_user(hdr) == LINK_CONFIG)) {
369 err = tipc_udp_rcast_disc(b, skb);
370 if (err)
371 goto rcu_out;
372 }
373
374 tipc_rcv(sock_net(sk), skb, b);
375 rcu_read_unlock();
376 return 0;
377
378rcu_out:
379 rcu_read_unlock();
380out:
381 kfree_skb(skb);
382 return 0;
383}
384
385static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
386{
387 int err = 0;
388 struct ip_mreqn mreqn;
389 struct sock *sk = ub->ubsock->sk;
390
391 if (ntohs(remote->proto) == ETH_P_IP) {
392 mreqn.imr_multiaddr = remote->ipv4;
393 mreqn.imr_ifindex = ub->ifindex;
394 err = ip_mc_join_group(sk, &mreqn);
395#if IS_ENABLED(CONFIG_IPV6)
396 } else {
397 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex,
398 &remote->ipv6);
399#endif
400 }
401 return err;
402}
403
404static int __tipc_nl_add_udp_addr(struct sk_buff *skb,
405 struct udp_media_addr *addr, int nla_t)
406{
407 if (ntohs(addr->proto) == ETH_P_IP) {
408 struct sockaddr_in ip4;
409
410 memset(&ip4, 0, sizeof(ip4));
411 ip4.sin_family = AF_INET;
412 ip4.sin_port = addr->port;
413 ip4.sin_addr.s_addr = addr->ipv4.s_addr;
414 if (nla_put(skb, nla_t, sizeof(ip4), &ip4))
415 return -EMSGSIZE;
416
417#if IS_ENABLED(CONFIG_IPV6)
418 } else if (ntohs(addr->proto) == ETH_P_IPV6) {
419 struct sockaddr_in6 ip6;
420
421 memset(&ip6, 0, sizeof(ip6));
422 ip6.sin6_family = AF_INET6;
423 ip6.sin6_port = addr->port;
424 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr));
425 if (nla_put(skb, nla_t, sizeof(ip6), &ip6))
426 return -EMSGSIZE;
427#endif
428 }
429
430 return 0;
431}
432
433int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb)
434{
435 u32 bid = cb->args[0];
436 u32 skip_cnt = cb->args[1];
437 u32 portid = NETLINK_CB(cb->skb).portid;
438 struct udp_replicast *rcast, *tmp;
439 struct tipc_bearer *b;
440 struct udp_bearer *ub;
441 void *hdr;
442 int err;
443 int i;
444
445 if (!bid && !skip_cnt) {
446 struct net *net = sock_net(skb->sk);
447 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1];
448 struct nlattr **attrs;
449 char *bname;
450
451 err = tipc_nlmsg_parse(cb->nlh, &attrs);
452 if (err)
453 return err;
454
455 if (!attrs[TIPC_NLA_BEARER])
456 return -EINVAL;
457
458 err = nla_parse_nested(battrs, TIPC_NLA_BEARER_MAX,
459 attrs[TIPC_NLA_BEARER],
460 tipc_nl_bearer_policy);
461 if (err)
462 return err;
463
464 if (!battrs[TIPC_NLA_BEARER_NAME])
465 return -EINVAL;
466
467 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]);
468
469 rtnl_lock();
470 b = tipc_bearer_find(net, bname);
471 if (!b) {
472 rtnl_unlock();
473 return -EINVAL;
474 }
475 bid = b->identity;
476 } else {
477 struct net *net = sock_net(skb->sk);
478 struct tipc_net *tn = net_generic(net, tipc_net_id);
479
480 rtnl_lock();
481 b = rtnl_dereference(tn->bearer_list[bid]);
482 if (!b) {
483 rtnl_unlock();
484 return -EINVAL;
485 }
486 }
487
488 ub = rcu_dereference_rtnl(b->media_ptr);
489 if (!ub) {
490 rtnl_unlock();
491 return -EINVAL;
492 }
493
494 i = 0;
495 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
496 if (i < skip_cnt)
497 goto count;
498
499 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq,
500 &tipc_genl_family, NLM_F_MULTI,
501 TIPC_NL_BEARER_GET);
502 if (!hdr)
503 goto done;
504
505 err = __tipc_nl_add_udp_addr(skb, &rcast->addr,
506 TIPC_NLA_UDP_REMOTE);
507 if (err) {
508 genlmsg_cancel(skb, hdr);
509 goto done;
510 }
511 genlmsg_end(skb, hdr);
512count:
513 i++;
514 }
515done:
516 rtnl_unlock();
517 cb->args[0] = bid;
518 cb->args[1] = i;
519
520 return skb->len;
521}
522
523int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b)
524{
525 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
526 struct udp_media_addr *dst;
527 struct udp_bearer *ub;
528 struct nlattr *nest;
529
530 ub = rcu_dereference_rtnl(b->media_ptr);
531 if (!ub)
532 return -ENODEV;
533
534 nest = nla_nest_start(msg->skb, TIPC_NLA_BEARER_UDP_OPTS);
535 if (!nest)
536 goto msg_full;
537
538 if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL))
539 goto msg_full;
540
541 dst = (struct udp_media_addr *)&b->bcast_addr.value;
542 if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE))
543 goto msg_full;
544
545 if (!list_empty(&ub->rcast.list)) {
546 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP))
547 goto msg_full;
548 }
549
550 nla_nest_end(msg->skb, nest);
551 return 0;
552msg_full:
553 nla_nest_cancel(msg->skb, nest);
554 return -EMSGSIZE;
555}
556
557/**
558 * tipc_parse_udp_addr - build udp media address from netlink data
559 * @nlattr: netlink attribute containing sockaddr storage aligned address
560 * @addr: tipc media address to fill with address, port and protocol type
561 * @scope_id: IPv6 scope id pointer, not NULL indicates it's required
562 */
563
564static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr,
565 u32 *scope_id)
566{
567 struct sockaddr_storage sa;
568
569 nla_memcpy(&sa, nla, sizeof(sa));
570 if (sa.ss_family == AF_INET) {
571 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa;
572
573 addr->proto = htons(ETH_P_IP);
574 addr->port = ip4->sin_port;
575 addr->ipv4.s_addr = ip4->sin_addr.s_addr;
576 return 0;
577
578#if IS_ENABLED(CONFIG_IPV6)
579 } else if (sa.ss_family == AF_INET6) {
580 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa;
581
582 addr->proto = htons(ETH_P_IPV6);
583 addr->port = ip6->sin6_port;
584 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr));
585
586 /* Scope ID is only interesting for local addresses */
587 if (scope_id) {
588 int atype;
589
590 atype = ipv6_addr_type(&ip6->sin6_addr);
591 if (__ipv6_addr_needs_scope_id(atype) &&
592 !ip6->sin6_scope_id) {
593 return -EINVAL;
594 }
595
596 *scope_id = ip6->sin6_scope_id ? : 0;
597 }
598
599 return 0;
600#endif
601 }
602 return -EADDRNOTAVAIL;
603}
604
605int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr)
606{
607 int err;
608 struct udp_media_addr addr = {0};
609 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
610 struct udp_media_addr *dst;
611
612 if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy))
613 return -EINVAL;
614
615 if (!opts[TIPC_NLA_UDP_REMOTE])
616 return -EINVAL;
617
618 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL);
619 if (err)
620 return err;
621
622 dst = (struct udp_media_addr *)&b->bcast_addr.value;
623 if (tipc_udp_is_mcast_addr(dst)) {
624 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n");
625 return -EINVAL;
626 }
627
628 if (tipc_udp_is_known_peer(b, &addr))
629 return 0;
630
631 return tipc_udp_rcast_add(b, &addr);
632}
633
634/**
635 * tipc_udp_enable - callback to create a new udp bearer instance
636 * @net: network namespace
637 * @b: pointer to generic tipc_bearer
638 * @attrs: netlink bearer configuration
639 *
640 * validate the bearer parameters and initialize the udp bearer
641 * rtnl_lock should be held
642 */
643static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
644 struct nlattr *attrs[])
645{
646 int err = -EINVAL;
647 struct udp_bearer *ub;
648 struct udp_media_addr remote = {0};
649 struct udp_media_addr local = {0};
650 struct udp_port_cfg udp_conf = {0};
651 struct udp_tunnel_sock_cfg tuncfg = {NULL};
652 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
653
654 ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
655 if (!ub)
656 return -ENOMEM;
657
658 INIT_LIST_HEAD(&ub->rcast.list);
659
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],
665 tipc_nl_udp_policy))
666 goto err;
667
668 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) {
669 pr_err("Invalid UDP bearer configuration");
670 err = -EINVAL;
671 goto err;
672 }
673
674 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local,
675 &ub->ifindex);
676 if (err)
677 goto err;
678
679 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL);
680 if (err)
681 goto err;
682
683 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
684 b->bcast_addr.broadcast = 1;
685 rcu_assign_pointer(b->media_ptr, ub);
686 rcu_assign_pointer(ub->bearer, b);
687 tipc_udp_media_addr_set(&b->addr, &local);
688 if (local.proto == htons(ETH_P_IP)) {
689 struct net_device *dev;
690
691 dev = __ip_dev_find(net, local.ipv4.s_addr, false);
692 if (!dev) {
693 err = -ENODEV;
694 goto err;
695 }
696 udp_conf.family = AF_INET;
697 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
698 udp_conf.use_udp_checksums = false;
699 ub->ifindex = dev->ifindex;
700 if (tipc_mtu_bad(dev, sizeof(struct iphdr) +
701 sizeof(struct udphdr))) {
702 err = -EINVAL;
703 goto err;
704 }
705 b->mtu = dev->mtu - sizeof(struct iphdr)
706 - sizeof(struct udphdr);
707#if IS_ENABLED(CONFIG_IPV6)
708 } else if (local.proto == htons(ETH_P_IPV6)) {
709 udp_conf.family = AF_INET6;
710 udp_conf.use_udp6_tx_checksums = true;
711 udp_conf.use_udp6_rx_checksums = true;
712 udp_conf.local_ip6 = in6addr_any;
713 b->mtu = 1280;
714#endif
715 } else {
716 err = -EAFNOSUPPORT;
717 goto err;
718 }
719 udp_conf.local_udp_port = local.port;
720 err = udp_sock_create(net, &udp_conf, &ub->ubsock);
721 if (err)
722 goto err;
723 tuncfg.sk_user_data = ub;
724 tuncfg.encap_type = 1;
725 tuncfg.encap_rcv = tipc_udp_recv;
726 tuncfg.encap_destroy = NULL;
727 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);
728
729 /**
730 * The bcast media address port is used for all peers and the ip
731 * is used if it's a multicast address.
732 */
733 memcpy(&b->bcast_addr.value, &remote, sizeof(remote));
734 if (tipc_udp_is_mcast_addr(&remote))
735 err = enable_mcast(ub, &remote);
736 else
737 err = tipc_udp_rcast_add(b, &remote);
738 if (err)
739 goto err;
740
741 return 0;
742err:
743 if (ub->ubsock)
744 udp_tunnel_sock_release(ub->ubsock);
745 kfree(ub);
746 return err;
747}
748
749/* cleanup_bearer - break the socket/bearer association */
750static void cleanup_bearer(struct work_struct *work)
751{
752 struct udp_bearer *ub = container_of(work, struct udp_bearer, work);
753 struct udp_replicast *rcast, *tmp;
754
755 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
756 list_del_rcu(&rcast->list);
757 kfree_rcu(rcast, rcu);
758 }
759
760 if (ub->ubsock)
761 udp_tunnel_sock_release(ub->ubsock);
762 synchronize_net();
763 kfree(ub);
764}
765
766/* tipc_udp_disable - detach bearer from socket */
767static void tipc_udp_disable(struct tipc_bearer *b)
768{
769 struct udp_bearer *ub;
770
771 ub = rcu_dereference_rtnl(b->media_ptr);
772 if (!ub) {
773 pr_err("UDP bearer instance not found\n");
774 return;
775 }
776 if (ub->ubsock)
777 sock_set_flag(ub->ubsock->sk, SOCK_DEAD);
778 RCU_INIT_POINTER(ub->bearer, NULL);
779
780 /* sock_release need to be done outside of rtnl lock */
781 INIT_WORK(&ub->work, cleanup_bearer);
782 schedule_work(&ub->work);
783}
784
785struct tipc_media udp_media_info = {
786 .send_msg = tipc_udp_send_msg,
787 .enable_media = tipc_udp_enable,
788 .disable_media = tipc_udp_disable,
789 .addr2str = tipc_udp_addr2str,
790 .addr2msg = tipc_udp_addr2msg,
791 .msg2addr = tipc_udp_msg2addr,
792 .priority = TIPC_DEF_LINK_PRI,
793 .tolerance = TIPC_DEF_LINK_TOL,
794 .window = TIPC_DEF_LINK_WIN,
795 .type_id = TIPC_MEDIA_TYPE_UDP,
796 .hwaddr_len = 0,
797 .name = "udp"
798};