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/ipv6_stubs.h>
48 #include <linux/tipc_netlink.h>
49 #include "core.h"
50 #include "addr.h"
51 #include "net.h"
52 #include "bearer.h"
53 #include "netlink.h"
54 #include "msg.h"
55 #include "udp_media.h"
56
57 /* IANA assigned UDP port */
58 #define UDP_PORT_DEFAULT 6118
59
60 #define UDP_MIN_HEADROOM 48
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 * @proto: Ethernet protocol in use
69 * @port: port being used
70 * @ipv4: IPv4 address of neighbor
71 * @ipv6: IPv6 address of neighbor
72 */
73 struct udp_media_addr {
74 __be16 proto;
75 __be16 port;
76 union {
77 struct in_addr ipv4;
78 struct in6_addr ipv6;
79 };
80 };
81
82 /* struct udp_replicast - container for UDP remote addresses */
83 struct udp_replicast {
84 struct udp_media_addr addr;
85 struct dst_cache dst_cache;
86 struct rcu_head rcu;
87 struct list_head list;
88 };
89
90 /**
91 * struct udp_bearer - ip/udp bearer data structure
92 * @bearer: associated generic tipc bearer
93 * @ubsock: bearer associated socket
94 * @ifindex: local address scope
95 * @work: used to schedule deferred work on a bearer
96 * @rcast: associated udp_replicast container
97 */
98 struct udp_bearer {
99 struct tipc_bearer __rcu *bearer;
100 struct socket *ubsock;
101 u32 ifindex;
102 struct work_struct work;
103 struct udp_replicast rcast;
104 };
105
106 static int tipc_udp_is_mcast_addr(struct udp_media_addr *addr)
107 {
108 if (ntohs(addr->proto) == ETH_P_IP)
109 return ipv4_is_multicast(addr->ipv4.s_addr);
110 #if IS_ENABLED(CONFIG_IPV6)
111 else
112 return ipv6_addr_is_multicast(&addr->ipv6);
113 #endif
114 return 0;
115 }
116
117 /* udp_media_addr_set - convert a ip/udp address to a TIPC media address */
118 static void tipc_udp_media_addr_set(struct tipc_media_addr *addr,
119 struct udp_media_addr *ua)
120 {
121 memset(addr, 0, sizeof(struct tipc_media_addr));
122 addr->media_id = TIPC_MEDIA_TYPE_UDP;
123 memcpy(addr->value, ua, sizeof(struct udp_media_addr));
124
125 if (tipc_udp_is_mcast_addr(ua))
126 addr->broadcast = TIPC_BROADCAST_SUPPORT;
127 }
128
129 /* tipc_udp_addr2str - convert ip/udp address to string */
130 static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size)
131 {
132 struct udp_media_addr *ua = (struct udp_media_addr *)&a->value;
133
134 if (ntohs(ua->proto) == ETH_P_IP)
135 snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port));
136 else if (ntohs(ua->proto) == ETH_P_IPV6)
137 snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port));
138 else {
139 pr_err("Invalid UDP media address\n");
140 return 1;
141 }
142
143 return 0;
144 }
145
146 /* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */
147 static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a,
148 char *msg)
149 {
150 struct udp_media_addr *ua;
151
152 ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET);
153 if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP)
154 return -EINVAL;
155 tipc_udp_media_addr_set(a, ua);
156 return 0;
157 }
158
159 /* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */
160 static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a)
161 {
162 memset(msg, 0, TIPC_MEDIA_INFO_SIZE);
163 msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP;
164 memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value,
165 sizeof(struct udp_media_addr));
166 return 0;
167 }
168
169 /* tipc_send_msg - enqueue a send request */
170 static int tipc_udp_xmit(struct net *net, struct sk_buff *skb,
171 struct udp_bearer *ub, struct udp_media_addr *src,
172 struct udp_media_addr *dst, struct dst_cache *cache)
173 {
174 struct dst_entry *ndst;
175 int ttl, err = 0;
176
177 local_bh_disable();
178 ndst = dst_cache_get(cache);
179 if (dst->proto == htons(ETH_P_IP)) {
180 struct rtable *rt = dst_rtable(ndst);
181
182 if (!rt) {
183 struct flowi4 fl = {
184 .daddr = dst->ipv4.s_addr,
185 .saddr = src->ipv4.s_addr,
186 .flowi4_mark = skb->mark,
187 .flowi4_proto = IPPROTO_UDP
188 };
189 rt = ip_route_output_key(net, &fl);
190 if (IS_ERR(rt)) {
191 err = PTR_ERR(rt);
192 goto tx_error;
193 }
194 dst_cache_set_ip4(cache, &rt->dst, fl.saddr);
195 }
196
197 ttl = ip4_dst_hoplimit(&rt->dst);
198 udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr,
199 dst->ipv4.s_addr, 0, ttl, 0, src->port,
200 dst->port, false, true);
201 #if IS_ENABLED(CONFIG_IPV6)
202 } else {
203 if (!ndst) {
204 struct flowi6 fl6 = {
205 .flowi6_oif = ub->ifindex,
206 .daddr = dst->ipv6,
207 .saddr = src->ipv6,
208 .flowi6_proto = IPPROTO_UDP
209 };
210 ndst = ipv6_stub->ipv6_dst_lookup_flow(net,
211 ub->ubsock->sk,
212 &fl6, NULL);
213 if (IS_ERR(ndst)) {
214 err = PTR_ERR(ndst);
215 goto tx_error;
216 }
217 dst_cache_set_ip6(cache, ndst, &fl6.saddr);
218 }
219 ttl = ip6_dst_hoplimit(ndst);
220 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, NULL,
221 &src->ipv6, &dst->ipv6, 0, ttl, 0,
222 src->port, dst->port, false);
223 #endif
224 }
225 local_bh_enable();
226 return err;
227
228 tx_error:
229 local_bh_enable();
230 kfree_skb(skb);
231 return err;
232 }
233
234 static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
235 struct tipc_bearer *b,
236 struct tipc_media_addr *addr)
237 {
238 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
239 struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value;
240 struct udp_replicast *rcast;
241 struct udp_bearer *ub;
242 int err = 0;
243
244 if (skb_headroom(skb) < UDP_MIN_HEADROOM) {
245 err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC);
246 if (err)
247 goto out;
248 }
249
250 skb_set_inner_protocol(skb, htons(ETH_P_TIPC));
251 ub = rcu_dereference(b->media_ptr);
252 if (!ub) {
253 err = -ENODEV;
254 goto out;
255 }
256
257 if (addr->broadcast != TIPC_REPLICAST_SUPPORT)
258 return tipc_udp_xmit(net, skb, ub, src, dst,
259 &ub->rcast.dst_cache);
260
261 /* Replicast, send an skb to each configured IP address */
262 list_for_each_entry_rcu(rcast, &ub->rcast.list, list) {
263 struct sk_buff *_skb;
264
265 _skb = pskb_copy(skb, GFP_ATOMIC);
266 if (!_skb) {
267 err = -ENOMEM;
268 goto out;
269 }
270
271 err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr,
272 &rcast->dst_cache);
273 if (err)
274 goto out;
275 }
276 err = 0;
277 out:
278 kfree_skb(skb);
279 return err;
280 }
281
282 static bool tipc_udp_is_known_peer(struct tipc_bearer *b,
283 struct udp_media_addr *addr)
284 {
285 struct udp_replicast *rcast, *tmp;
286 struct udp_bearer *ub;
287
288 ub = rcu_dereference_rtnl(b->media_ptr);
289 if (!ub) {
290 pr_err_ratelimited("UDP bearer instance not found\n");
291 return false;
292 }
293
294 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
295 if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr)))
296 return true;
297 }
298
299 return false;
300 }
301
302 static int tipc_udp_rcast_add(struct tipc_bearer *b,
303 struct udp_media_addr *addr)
304 {
305 struct udp_replicast *rcast;
306 struct udp_bearer *ub;
307
308 ub = rcu_dereference_rtnl(b->media_ptr);
309 if (!ub)
310 return -ENODEV;
311
312 rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC);
313 if (!rcast)
314 return -ENOMEM;
315
316 if (dst_cache_init(&rcast->dst_cache, GFP_ATOMIC)) {
317 kfree(rcast);
318 return -ENOMEM;
319 }
320
321 memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr));
322
323 if (ntohs(addr->proto) == ETH_P_IP)
324 pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4);
325 #if IS_ENABLED(CONFIG_IPV6)
326 else if (ntohs(addr->proto) == ETH_P_IPV6)
327 pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6);
328 #endif
329 b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT;
330 list_add_rcu(&rcast->list, &ub->rcast.list);
331 return 0;
332 }
333
334 static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb)
335 {
336 struct udp_media_addr src = {0};
337 struct udp_media_addr *dst;
338
339 dst = (struct udp_media_addr *)&b->bcast_addr.value;
340 if (tipc_udp_is_mcast_addr(dst))
341 return 0;
342
343 src.port = udp_hdr(skb)->source;
344
345 if (ip_hdr(skb)->version == 4) {
346 struct iphdr *iphdr = ip_hdr(skb);
347
348 src.proto = htons(ETH_P_IP);
349 src.ipv4.s_addr = iphdr->saddr;
350 if (ipv4_is_multicast(iphdr->daddr))
351 return 0;
352 #if IS_ENABLED(CONFIG_IPV6)
353 } else if (ip_hdr(skb)->version == 6) {
354 struct ipv6hdr *iphdr = ipv6_hdr(skb);
355
356 src.proto = htons(ETH_P_IPV6);
357 src.ipv6 = iphdr->saddr;
358 if (ipv6_addr_is_multicast(&iphdr->daddr))
359 return 0;
360 #endif
361 } else {
362 return 0;
363 }
364
365 if (likely(tipc_udp_is_known_peer(b, &src)))
366 return 0;
367
368 return tipc_udp_rcast_add(b, &src);
369 }
370
371 /* tipc_udp_recv - read data from bearer socket */
372 static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb)
373 {
374 struct udp_bearer *ub;
375 struct tipc_bearer *b;
376 struct tipc_msg *hdr;
377 int err;
378
379 ub = rcu_dereference_sk_user_data(sk);
380 if (!ub) {
381 pr_err_ratelimited("Failed to get UDP bearer reference");
382 goto out;
383 }
384 skb_pull(skb, sizeof(struct udphdr));
385 hdr = buf_msg(skb);
386
387 b = rcu_dereference(ub->bearer);
388 if (!b)
389 goto out;
390
391 if (b && test_bit(0, &b->up)) {
392 TIPC_SKB_CB(skb)->flags = 0;
393 tipc_rcv(sock_net(sk), skb, b);
394 return 0;
395 }
396
397 if (unlikely(msg_user(hdr) == LINK_CONFIG)) {
398 err = tipc_udp_rcast_disc(b, skb);
399 if (err)
400 goto out;
401 }
402
403 out:
404 kfree_skb(skb);
405 return 0;
406 }
407
408 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
409 {
410 int err = 0;
411 struct ip_mreqn mreqn;
412 struct sock *sk = ub->ubsock->sk;
413
414 if (ntohs(remote->proto) == ETH_P_IP) {
415 mreqn.imr_multiaddr = remote->ipv4;
416 mreqn.imr_ifindex = ub->ifindex;
417 err = ip_mc_join_group(sk, &mreqn);
418 #if IS_ENABLED(CONFIG_IPV6)
419 } else {
420 lock_sock(sk);
421 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex,
422 &remote->ipv6);
423 release_sock(sk);
424 #endif
425 }
426 return err;
427 }
428
429 static int __tipc_nl_add_udp_addr(struct sk_buff *skb,
430 struct udp_media_addr *addr, int nla_t)
431 {
432 if (ntohs(addr->proto) == ETH_P_IP) {
433 struct sockaddr_in ip4;
434
435 memset(&ip4, 0, sizeof(ip4));
436 ip4.sin_family = AF_INET;
437 ip4.sin_port = addr->port;
438 ip4.sin_addr.s_addr = addr->ipv4.s_addr;
439 if (nla_put(skb, nla_t, sizeof(ip4), &ip4))
440 return -EMSGSIZE;
441
442 #if IS_ENABLED(CONFIG_IPV6)
443 } else if (ntohs(addr->proto) == ETH_P_IPV6) {
444 struct sockaddr_in6 ip6;
445
446 memset(&ip6, 0, sizeof(ip6));
447 ip6.sin6_family = AF_INET6;
448 ip6.sin6_port = addr->port;
449 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr));
450 if (nla_put(skb, nla_t, sizeof(ip6), &ip6))
451 return -EMSGSIZE;
452 #endif
453 }
454
455 return 0;
456 }
457
458 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb)
459 {
460 u32 bid = cb->args[0];
461 u32 skip_cnt = cb->args[1];
462 u32 portid = NETLINK_CB(cb->skb).portid;
463 struct udp_replicast *rcast, *tmp;
464 struct tipc_bearer *b;
465 struct udp_bearer *ub;
466 void *hdr;
467 int err;
468 int i;
469
470 if (!bid && !skip_cnt) {
471 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
472 struct net *net = sock_net(skb->sk);
473 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1];
474 char *bname;
475
476 if (!attrs[TIPC_NLA_BEARER])
477 return -EINVAL;
478
479 err = nla_parse_nested_deprecated(battrs, TIPC_NLA_BEARER_MAX,
480 attrs[TIPC_NLA_BEARER],
481 tipc_nl_bearer_policy, NULL);
482 if (err)
483 return err;
484
485 if (!battrs[TIPC_NLA_BEARER_NAME])
486 return -EINVAL;
487
488 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]);
489
490 rtnl_lock();
491 b = tipc_bearer_find(net, bname);
492 if (!b) {
493 rtnl_unlock();
494 return -EINVAL;
495 }
496 bid = b->identity;
497 } else {
498 struct net *net = sock_net(skb->sk);
499 struct tipc_net *tn = net_generic(net, tipc_net_id);
500
501 rtnl_lock();
502 b = rtnl_dereference(tn->bearer_list[bid]);
503 if (!b) {
504 rtnl_unlock();
505 return -EINVAL;
506 }
507 }
508
509 ub = rtnl_dereference(b->media_ptr);
510 if (!ub) {
511 rtnl_unlock();
512 return -EINVAL;
513 }
514
515 i = 0;
516 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
517 if (i < skip_cnt)
518 goto count;
519
520 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq,
521 &tipc_genl_family, NLM_F_MULTI,
522 TIPC_NL_BEARER_GET);
523 if (!hdr)
524 goto done;
525
526 err = __tipc_nl_add_udp_addr(skb, &rcast->addr,
527 TIPC_NLA_UDP_REMOTE);
528 if (err) {
529 genlmsg_cancel(skb, hdr);
530 goto done;
531 }
532 genlmsg_end(skb, hdr);
533 count:
534 i++;
535 }
536 done:
537 rtnl_unlock();
538 cb->args[0] = bid;
539 cb->args[1] = i;
540
541 return skb->len;
542 }
543
544 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b)
545 {
546 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
547 struct udp_media_addr *dst;
548 struct udp_bearer *ub;
549 struct nlattr *nest;
550
551 ub = rtnl_dereference(b->media_ptr);
552 if (!ub)
553 return -ENODEV;
554
555 nest = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_UDP_OPTS);
556 if (!nest)
557 goto msg_full;
558
559 if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL))
560 goto msg_full;
561
562 dst = (struct udp_media_addr *)&b->bcast_addr.value;
563 if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE))
564 goto msg_full;
565
566 if (!list_empty(&ub->rcast.list)) {
567 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP))
568 goto msg_full;
569 }
570
571 nla_nest_end(msg->skb, nest);
572 return 0;
573 msg_full:
574 nla_nest_cancel(msg->skb, nest);
575 return -EMSGSIZE;
576 }
577
578 /**
579 * tipc_parse_udp_addr - build udp media address from netlink data
580 * @nla: netlink attribute containing sockaddr storage aligned address
581 * @addr: tipc media address to fill with address, port and protocol type
582 * @scope_id: IPv6 scope id pointer, not NULL indicates it's required
583 */
584
585 static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr,
586 u32 *scope_id)
587 {
588 struct sockaddr_storage sa;
589
590 nla_memcpy(&sa, nla, sizeof(sa));
591 if (sa.ss_family == AF_INET) {
592 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa;
593
594 addr->proto = htons(ETH_P_IP);
595 addr->port = ip4->sin_port;
596 addr->ipv4.s_addr = ip4->sin_addr.s_addr;
597 return 0;
598
599 #if IS_ENABLED(CONFIG_IPV6)
600 } else if (sa.ss_family == AF_INET6) {
601 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa;
602
603 addr->proto = htons(ETH_P_IPV6);
604 addr->port = ip6->sin6_port;
605 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr));
606
607 /* Scope ID is only interesting for local addresses */
608 if (scope_id) {
609 int atype;
610
611 atype = ipv6_addr_type(&ip6->sin6_addr);
612 if (__ipv6_addr_needs_scope_id(atype) &&
613 !ip6->sin6_scope_id) {
614 return -EINVAL;
615 }
616
617 *scope_id = ip6->sin6_scope_id ? : 0;
618 }
619
620 return 0;
621 #endif
622 }
623 return -EADDRNOTAVAIL;
624 }
625
626 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr)
627 {
628 int err;
629 struct udp_media_addr addr = {0};
630 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
631 struct udp_media_addr *dst;
632
633 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy, NULL))
634 return -EINVAL;
635
636 if (!opts[TIPC_NLA_UDP_REMOTE])
637 return -EINVAL;
638
639 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL);
640 if (err)
641 return err;
642
643 dst = (struct udp_media_addr *)&b->bcast_addr.value;
644 if (tipc_udp_is_mcast_addr(dst)) {
645 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n");
646 return -EINVAL;
647 }
648
649 if (tipc_udp_is_known_peer(b, &addr))
650 return 0;
651
652 return tipc_udp_rcast_add(b, &addr);
653 }
654
655 /**
656 * tipc_udp_enable - callback to create a new udp bearer instance
657 * @net: network namespace
658 * @b: pointer to generic tipc_bearer
659 * @attrs: netlink bearer configuration
660 *
661 * validate the bearer parameters and initialize the udp bearer
662 * rtnl_lock should be held
663 */
664 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
665 struct nlattr *attrs[])
666 {
667 int err = -EINVAL;
668 struct udp_bearer *ub;
669 struct udp_media_addr remote = {0};
670 struct udp_media_addr local = {0};
671 struct udp_port_cfg udp_conf = {0};
672 struct udp_tunnel_sock_cfg tuncfg = {NULL};
673 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
674 u8 node_id[NODE_ID_LEN] = {0,};
675 struct net_device *dev;
676 int rmcast = 0;
677
678 ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
679 if (!ub)
680 return -ENOMEM;
681
682 INIT_LIST_HEAD(&ub->rcast.list);
683
684 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS])
685 goto err;
686
687 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attrs[TIPC_NLA_BEARER_UDP_OPTS], tipc_nl_udp_policy, NULL))
688 goto err;
689
690 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) {
691 pr_err("Invalid UDP bearer configuration");
692 err = -EINVAL;
693 goto err;
694 }
695
696 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local,
697 &ub->ifindex);
698 if (err)
699 goto err;
700
701 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL);
702 if (err)
703 goto err;
704
705 if (remote.proto != local.proto) {
706 err = -EINVAL;
707 goto err;
708 }
709
710 /* Checking remote ip address */
711 rmcast = tipc_udp_is_mcast_addr(&remote);
712
713 /* Autoconfigure own node identity if needed */
714 if (!tipc_own_id(net)) {
715 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16);
716 tipc_net_init(net, node_id, 0);
717 }
718 if (!tipc_own_id(net)) {
719 pr_warn("Failed to set node id, please configure manually\n");
720 err = -EINVAL;
721 goto err;
722 }
723
724 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
725 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
726 rcu_assign_pointer(b->media_ptr, ub);
727 rcu_assign_pointer(ub->bearer, b);
728 tipc_udp_media_addr_set(&b->addr, &local);
729 if (local.proto == htons(ETH_P_IP)) {
730 dev = __ip_dev_find(net, local.ipv4.s_addr, false);
731 if (!dev) {
732 err = -ENODEV;
733 goto err;
734 }
735 udp_conf.family = AF_INET;
736
737 /* Switch to use ANY to receive packets from group */
738 if (rmcast)
739 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
740 else
741 udp_conf.local_ip.s_addr = local.ipv4.s_addr;
742 udp_conf.use_udp_checksums = false;
743 ub->ifindex = dev->ifindex;
744 b->encap_hlen = sizeof(struct iphdr) + sizeof(struct udphdr);
745 b->mtu = b->media->mtu;
746 #if IS_ENABLED(CONFIG_IPV6)
747 } else if (local.proto == htons(ETH_P_IPV6)) {
748 dev = ub->ifindex ? __dev_get_by_index(net, ub->ifindex) : NULL;
749 dev = ipv6_dev_find(net, &local.ipv6, dev);
750 if (!dev) {
751 err = -ENODEV;
752 goto err;
753 }
754 udp_conf.family = AF_INET6;
755 udp_conf.use_udp6_tx_checksums = true;
756 udp_conf.use_udp6_rx_checksums = true;
757 if (rmcast)
758 udp_conf.local_ip6 = in6addr_any;
759 else
760 udp_conf.local_ip6 = local.ipv6;
761 ub->ifindex = dev->ifindex;
762 b->encap_hlen = sizeof(struct ipv6hdr) + sizeof(struct udphdr);
763 b->mtu = 1280;
764 #endif
765 } else {
766 err = -EAFNOSUPPORT;
767 goto err;
768 }
769 udp_conf.local_udp_port = local.port;
770 err = udp_sock_create(net, &udp_conf, &ub->ubsock);
771 if (err)
772 goto err;
773 tuncfg.sk_user_data = ub;
774 tuncfg.encap_type = 1;
775 tuncfg.encap_rcv = tipc_udp_recv;
776 tuncfg.encap_destroy = NULL;
777 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);
778
779 err = dst_cache_init(&ub->rcast.dst_cache, GFP_ATOMIC);
780 if (err)
781 goto free;
782
783 /*
784 * The bcast media address port is used for all peers and the ip
785 * is used if it's a multicast address.
786 */
787 memcpy(&b->bcast_addr.value, &remote, sizeof(remote));
788 if (rmcast)
789 err = enable_mcast(ub, &remote);
790 else
791 err = tipc_udp_rcast_add(b, &remote);
792 if (err)
793 goto free;
794
795 return 0;
796
797 free:
798 dst_cache_destroy(&ub->rcast.dst_cache);
799 udp_tunnel_sock_release(ub->ubsock);
800 err:
801 kfree(ub);
802 return err;
803 }
804
805 /* cleanup_bearer - break the socket/bearer association */
806 static void cleanup_bearer(struct work_struct *work)
807 {
808 struct udp_bearer *ub = container_of(work, struct udp_bearer, work);
809 struct udp_replicast *rcast, *tmp;
810
811 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
812 dst_cache_destroy(&rcast->dst_cache);
813 list_del_rcu(&rcast->list);
814 kfree_rcu(rcast, rcu);
815 }
816
817 atomic_dec(&tipc_net(sock_net(ub->ubsock->sk))->wq_count);
818 dst_cache_destroy(&ub->rcast.dst_cache);
819 udp_tunnel_sock_release(ub->ubsock);
820 synchronize_net();
821 kfree(ub);
822 }
823
824 /* tipc_udp_disable - detach bearer from socket */
825 static void tipc_udp_disable(struct tipc_bearer *b)
826 {
827 struct udp_bearer *ub;
828
829 ub = rtnl_dereference(b->media_ptr);
830 if (!ub) {
831 pr_err("UDP bearer instance not found\n");
832 return;
833 }
834 sock_set_flag(ub->ubsock->sk, SOCK_DEAD);
835 RCU_INIT_POINTER(ub->bearer, NULL);
836
837 /* sock_release need to be done outside of rtnl lock */
838 atomic_inc(&tipc_net(sock_net(ub->ubsock->sk))->wq_count);
839 INIT_WORK(&ub->work, cleanup_bearer);
840 schedule_work(&ub->work);
841 }
842
843 struct tipc_media udp_media_info = {
844 .send_msg = tipc_udp_send_msg,
845 .enable_media = tipc_udp_enable,
846 .disable_media = tipc_udp_disable,
847 .addr2str = tipc_udp_addr2str,
848 .addr2msg = tipc_udp_addr2msg,
849 .msg2addr = tipc_udp_msg2addr,
850 .priority = TIPC_DEF_LINK_PRI,
851 .tolerance = TIPC_DEF_LINK_TOL,
852 .min_win = TIPC_DEF_LINK_WIN,
853 .max_win = TIPC_DEF_LINK_WIN,
854 .mtu = TIPC_DEF_LINK_UDP_MTU,
855 .type_id = TIPC_MEDIA_TYPE_UDP,
856 .hwaddr_len = 0,
857 .name = "udp"
858 };
859
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