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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
56
57#define UDP_PORT_DEFAULT 6118
58
59#define UDP_MIN_HEADROOM 48
60
61
62
63
64
65
66
67struct udp_media_addr {
68 __be16 proto;
69 __be16 port;
70 union {
71 struct in_addr ipv4;
72 struct in6_addr ipv6;
73 };
74};
75
76
77struct udp_replicast {
78 struct udp_media_addr addr;
79 struct dst_cache dst_cache;
80 struct rcu_head rcu;
81 struct list_head list;
82};
83
84
85
86
87
88
89
90
91struct udp_bearer {
92 struct tipc_bearer __rcu *bearer;
93 struct socket *ubsock;
94 u32 ifindex;
95 struct work_struct work;
96 struct udp_replicast rcast;
97};
98
99static int tipc_udp_is_mcast_addr(struct udp_media_addr *addr)
100{
101 if (ntohs(addr->proto) == ETH_P_IP)
102 return ipv4_is_multicast(addr->ipv4.s_addr);
103#if IS_ENABLED(CONFIG_IPV6)
104 else
105 return ipv6_addr_is_multicast(&addr->ipv6);
106#endif
107 return 0;
108}
109
110
111static void tipc_udp_media_addr_set(struct tipc_media_addr *addr,
112 struct udp_media_addr *ua)
113{
114 memset(addr, 0, sizeof(struct tipc_media_addr));
115 addr->media_id = TIPC_MEDIA_TYPE_UDP;
116 memcpy(addr->value, ua, sizeof(struct udp_media_addr));
117
118 if (tipc_udp_is_mcast_addr(ua))
119 addr->broadcast = TIPC_BROADCAST_SUPPORT;
120}
121
122
123static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size)
124{
125 struct udp_media_addr *ua = (struct udp_media_addr *)&a->value;
126
127 if (ntohs(ua->proto) == ETH_P_IP)
128 snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port));
129 else if (ntohs(ua->proto) == ETH_P_IPV6)
130 snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port));
131 else
132 pr_err("Invalid UDP media address\n");
133 return 0;
134}
135
136
137static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a,
138 char *msg)
139{
140 struct udp_media_addr *ua;
141
142 ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET);
143 if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP)
144 return -EINVAL;
145 tipc_udp_media_addr_set(a, ua);
146 return 0;
147}
148
149
150static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a)
151{
152 memset(msg, 0, TIPC_MEDIA_INFO_SIZE);
153 msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP;
154 memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value,
155 sizeof(struct udp_media_addr));
156 return 0;
157}
158
159
160static int tipc_udp_xmit(struct net *net, struct sk_buff *skb,
161 struct udp_bearer *ub, struct udp_media_addr *src,
162 struct udp_media_addr *dst, struct dst_cache *cache)
163{
164 struct dst_entry *ndst = dst_cache_get(cache);
165 int ttl, err = 0;
166
167 if (dst->proto == htons(ETH_P_IP)) {
168 struct rtable *rt = (struct rtable *)ndst;
169
170 if (!rt) {
171 struct flowi4 fl = {
172 .daddr = dst->ipv4.s_addr,
173 .saddr = src->ipv4.s_addr,
174 .flowi4_mark = skb->mark,
175 .flowi4_proto = IPPROTO_UDP
176 };
177 rt = ip_route_output_key(net, &fl);
178 if (IS_ERR(rt)) {
179 err = PTR_ERR(rt);
180 goto tx_error;
181 }
182 dst_cache_set_ip4(cache, &rt->dst, fl.saddr);
183 }
184
185 ttl = ip4_dst_hoplimit(&rt->dst);
186 udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr,
187 dst->ipv4.s_addr, 0, ttl, 0, src->port,
188 dst->port, false, true);
189#if IS_ENABLED(CONFIG_IPV6)
190 } else {
191 if (!ndst) {
192 struct flowi6 fl6 = {
193 .flowi6_oif = ub->ifindex,
194 .daddr = dst->ipv6,
195 .saddr = src->ipv6,
196 .flowi6_proto = IPPROTO_UDP
197 };
198 ndst = ipv6_stub->ipv6_dst_lookup_flow(net,
199 ub->ubsock->sk,
200 &fl6, NULL);
201 if (IS_ERR(ndst)) {
202 err = PTR_ERR(ndst);
203 goto tx_error;
204 }
205 dst_cache_set_ip6(cache, ndst, &fl6.saddr);
206 }
207 ttl = ip6_dst_hoplimit(ndst);
208 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, NULL,
209 &src->ipv6, &dst->ipv6, 0, ttl, 0,
210 src->port, dst->port, false);
211#endif
212 }
213 return err;
214
215tx_error:
216 kfree_skb(skb);
217 return err;
218}
219
220static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
221 struct tipc_bearer *b,
222 struct tipc_media_addr *addr)
223{
224 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
225 struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value;
226 struct udp_replicast *rcast;
227 struct udp_bearer *ub;
228 int err = 0;
229
230 if (skb_headroom(skb) < UDP_MIN_HEADROOM) {
231 err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC);
232 if (err)
233 goto out;
234 }
235
236 skb_set_inner_protocol(skb, htons(ETH_P_TIPC));
237 ub = rcu_dereference(b->media_ptr);
238 if (!ub) {
239 err = -ENODEV;
240 goto out;
241 }
242
243 if (addr->broadcast != TIPC_REPLICAST_SUPPORT)
244 return tipc_udp_xmit(net, skb, ub, src, dst,
245 &ub->rcast.dst_cache);
246
247
248 list_for_each_entry_rcu(rcast, &ub->rcast.list, list) {
249 struct sk_buff *_skb;
250
251 _skb = pskb_copy(skb, GFP_ATOMIC);
252 if (!_skb) {
253 err = -ENOMEM;
254 goto out;
255 }
256
257 err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr,
258 &rcast->dst_cache);
259 if (err)
260 goto out;
261 }
262 err = 0;
263out:
264 kfree_skb(skb);
265 return err;
266}
267
268static bool tipc_udp_is_known_peer(struct tipc_bearer *b,
269 struct udp_media_addr *addr)
270{
271 struct udp_replicast *rcast, *tmp;
272 struct udp_bearer *ub;
273
274 ub = rcu_dereference_rtnl(b->media_ptr);
275 if (!ub) {
276 pr_err_ratelimited("UDP bearer instance not found\n");
277 return false;
278 }
279
280 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
281 if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr)))
282 return true;
283 }
284
285 return false;
286}
287
288static int tipc_udp_rcast_add(struct tipc_bearer *b,
289 struct udp_media_addr *addr)
290{
291 struct udp_replicast *rcast;
292 struct udp_bearer *ub;
293
294 ub = rcu_dereference_rtnl(b->media_ptr);
295 if (!ub)
296 return -ENODEV;
297
298 rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC);
299 if (!rcast)
300 return -ENOMEM;
301
302 if (dst_cache_init(&rcast->dst_cache, GFP_ATOMIC)) {
303 kfree(rcast);
304 return -ENOMEM;
305 }
306
307 memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr));
308
309 if (ntohs(addr->proto) == ETH_P_IP)
310 pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4);
311#if IS_ENABLED(CONFIG_IPV6)
312 else if (ntohs(addr->proto) == ETH_P_IPV6)
313 pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6);
314#endif
315 b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT;
316 list_add_rcu(&rcast->list, &ub->rcast.list);
317 return 0;
318}
319
320static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb)
321{
322 struct udp_media_addr src = {0};
323 struct udp_media_addr *dst;
324
325 dst = (struct udp_media_addr *)&b->bcast_addr.value;
326 if (tipc_udp_is_mcast_addr(dst))
327 return 0;
328
329 src.port = udp_hdr(skb)->source;
330
331 if (ip_hdr(skb)->version == 4) {
332 struct iphdr *iphdr = ip_hdr(skb);
333
334 src.proto = htons(ETH_P_IP);
335 src.ipv4.s_addr = iphdr->saddr;
336 if (ipv4_is_multicast(iphdr->daddr))
337 return 0;
338#if IS_ENABLED(CONFIG_IPV6)
339 } else if (ip_hdr(skb)->version == 6) {
340 struct ipv6hdr *iphdr = ipv6_hdr(skb);
341
342 src.proto = htons(ETH_P_IPV6);
343 src.ipv6 = iphdr->saddr;
344 if (ipv6_addr_is_multicast(&iphdr->daddr))
345 return 0;
346#endif
347 } else {
348 return 0;
349 }
350
351 if (likely(tipc_udp_is_known_peer(b, &src)))
352 return 0;
353
354 return tipc_udp_rcast_add(b, &src);
355}
356
357
358static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb)
359{
360 struct udp_bearer *ub;
361 struct tipc_bearer *b;
362 struct tipc_msg *hdr;
363 int err;
364
365 ub = rcu_dereference_sk_user_data(sk);
366 if (!ub) {
367 pr_err_ratelimited("Failed to get UDP bearer reference");
368 goto out;
369 }
370 skb_pull(skb, sizeof(struct udphdr));
371 hdr = buf_msg(skb);
372
373 b = rcu_dereference(ub->bearer);
374 if (!b)
375 goto out;
376
377 if (b && test_bit(0, &b->up)) {
378 tipc_rcv(sock_net(sk), skb, b);
379 return 0;
380 }
381
382 if (unlikely(msg_user(hdr) == LINK_CONFIG)) {
383 err = tipc_udp_rcast_disc(b, skb);
384 if (err)
385 goto out;
386 }
387
388out:
389 kfree_skb(skb);
390 return 0;
391}
392
393static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
394{
395 int err = 0;
396 struct ip_mreqn mreqn;
397 struct sock *sk = ub->ubsock->sk;
398
399 if (ntohs(remote->proto) == ETH_P_IP) {
400 mreqn.imr_multiaddr = remote->ipv4;
401 mreqn.imr_ifindex = ub->ifindex;
402 err = ip_mc_join_group(sk, &mreqn);
403#if IS_ENABLED(CONFIG_IPV6)
404 } else {
405 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex,
406 &remote->ipv6);
407#endif
408 }
409 return err;
410}
411
412static int __tipc_nl_add_udp_addr(struct sk_buff *skb,
413 struct udp_media_addr *addr, int nla_t)
414{
415 if (ntohs(addr->proto) == ETH_P_IP) {
416 struct sockaddr_in ip4;
417
418 memset(&ip4, 0, sizeof(ip4));
419 ip4.sin_family = AF_INET;
420 ip4.sin_port = addr->port;
421 ip4.sin_addr.s_addr = addr->ipv4.s_addr;
422 if (nla_put(skb, nla_t, sizeof(ip4), &ip4))
423 return -EMSGSIZE;
424
425#if IS_ENABLED(CONFIG_IPV6)
426 } else if (ntohs(addr->proto) == ETH_P_IPV6) {
427 struct sockaddr_in6 ip6;
428
429 memset(&ip6, 0, sizeof(ip6));
430 ip6.sin6_family = AF_INET6;
431 ip6.sin6_port = addr->port;
432 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr));
433 if (nla_put(skb, nla_t, sizeof(ip6), &ip6))
434 return -EMSGSIZE;
435#endif
436 }
437
438 return 0;
439}
440
441int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb)
442{
443 u32 bid = cb->args[0];
444 u32 skip_cnt = cb->args[1];
445 u32 portid = NETLINK_CB(cb->skb).portid;
446 struct udp_replicast *rcast, *tmp;
447 struct tipc_bearer *b;
448 struct udp_bearer *ub;
449 void *hdr;
450 int err;
451 int i;
452
453 if (!bid && !skip_cnt) {
454 struct net *net = sock_net(skb->sk);
455 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1];
456 struct nlattr **attrs;
457 char *bname;
458
459 err = tipc_nlmsg_parse(cb->nlh, &attrs);
460 if (err)
461 return err;
462
463 if (!attrs[TIPC_NLA_BEARER])
464 return -EINVAL;
465
466 err = nla_parse_nested_deprecated(battrs, TIPC_NLA_BEARER_MAX,
467 attrs[TIPC_NLA_BEARER],
468 tipc_nl_bearer_policy, NULL);
469 if (err)
470 return err;
471
472 if (!battrs[TIPC_NLA_BEARER_NAME])
473 return -EINVAL;
474
475 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]);
476
477 rtnl_lock();
478 b = tipc_bearer_find(net, bname);
479 if (!b) {
480 rtnl_unlock();
481 return -EINVAL;
482 }
483 bid = b->identity;
484 } else {
485 struct net *net = sock_net(skb->sk);
486 struct tipc_net *tn = net_generic(net, tipc_net_id);
487
488 rtnl_lock();
489 b = rtnl_dereference(tn->bearer_list[bid]);
490 if (!b) {
491 rtnl_unlock();
492 return -EINVAL;
493 }
494 }
495
496 ub = rtnl_dereference(b->media_ptr);
497 if (!ub) {
498 rtnl_unlock();
499 return -EINVAL;
500 }
501
502 i = 0;
503 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
504 if (i < skip_cnt)
505 goto count;
506
507 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq,
508 &tipc_genl_family, NLM_F_MULTI,
509 TIPC_NL_BEARER_GET);
510 if (!hdr)
511 goto done;
512
513 err = __tipc_nl_add_udp_addr(skb, &rcast->addr,
514 TIPC_NLA_UDP_REMOTE);
515 if (err) {
516 genlmsg_cancel(skb, hdr);
517 goto done;
518 }
519 genlmsg_end(skb, hdr);
520count:
521 i++;
522 }
523done:
524 rtnl_unlock();
525 cb->args[0] = bid;
526 cb->args[1] = i;
527
528 return skb->len;
529}
530
531int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b)
532{
533 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
534 struct udp_media_addr *dst;
535 struct udp_bearer *ub;
536 struct nlattr *nest;
537
538 ub = rtnl_dereference(b->media_ptr);
539 if (!ub)
540 return -ENODEV;
541
542 nest = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_UDP_OPTS);
543 if (!nest)
544 goto msg_full;
545
546 if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL))
547 goto msg_full;
548
549 dst = (struct udp_media_addr *)&b->bcast_addr.value;
550 if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE))
551 goto msg_full;
552
553 if (!list_empty(&ub->rcast.list)) {
554 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP))
555 goto msg_full;
556 }
557
558 nla_nest_end(msg->skb, nest);
559 return 0;
560msg_full:
561 nla_nest_cancel(msg->skb, nest);
562 return -EMSGSIZE;
563}
564
565
566
567
568
569
570
571
572static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr,
573 u32 *scope_id)
574{
575 struct sockaddr_storage sa;
576
577 nla_memcpy(&sa, nla, sizeof(sa));
578 if (sa.ss_family == AF_INET) {
579 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa;
580
581 addr->proto = htons(ETH_P_IP);
582 addr->port = ip4->sin_port;
583 addr->ipv4.s_addr = ip4->sin_addr.s_addr;
584 return 0;
585
586#if IS_ENABLED(CONFIG_IPV6)
587 } else if (sa.ss_family == AF_INET6) {
588 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa;
589
590 addr->proto = htons(ETH_P_IPV6);
591 addr->port = ip6->sin6_port;
592 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr));
593
594
595 if (scope_id) {
596 int atype;
597
598 atype = ipv6_addr_type(&ip6->sin6_addr);
599 if (__ipv6_addr_needs_scope_id(atype) &&
600 !ip6->sin6_scope_id) {
601 return -EINVAL;
602 }
603
604 *scope_id = ip6->sin6_scope_id ? : 0;
605 }
606
607 return 0;
608#endif
609 }
610 return -EADDRNOTAVAIL;
611}
612
613int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr)
614{
615 int err;
616 struct udp_media_addr addr = {0};
617 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
618 struct udp_media_addr *dst;
619
620 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy, NULL))
621 return -EINVAL;
622
623 if (!opts[TIPC_NLA_UDP_REMOTE])
624 return -EINVAL;
625
626 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL);
627 if (err)
628 return err;
629
630 dst = (struct udp_media_addr *)&b->bcast_addr.value;
631 if (tipc_udp_is_mcast_addr(dst)) {
632 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n");
633 return -EINVAL;
634 }
635
636 if (tipc_udp_is_known_peer(b, &addr))
637 return 0;
638
639 return tipc_udp_rcast_add(b, &addr);
640}
641
642
643
644
645
646
647
648
649
650
651static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
652 struct nlattr *attrs[])
653{
654 int err = -EINVAL;
655 struct udp_bearer *ub;
656 struct udp_media_addr remote = {0};
657 struct udp_media_addr local = {0};
658 struct udp_port_cfg udp_conf = {0};
659 struct udp_tunnel_sock_cfg tuncfg = {NULL};
660 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
661 u8 node_id[NODE_ID_LEN] = {0,};
662 int rmcast = 0;
663
664 ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
665 if (!ub)
666 return -ENOMEM;
667
668 INIT_LIST_HEAD(&ub->rcast.list);
669
670 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS])
671 goto err;
672
673 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attrs[TIPC_NLA_BEARER_UDP_OPTS], tipc_nl_udp_policy, NULL))
674 goto err;
675
676 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) {
677 pr_err("Invalid UDP bearer configuration");
678 err = -EINVAL;
679 goto err;
680 }
681
682 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local,
683 &ub->ifindex);
684 if (err)
685 goto err;
686
687 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL);
688 if (err)
689 goto err;
690
691 if (remote.proto != local.proto) {
692 err = -EINVAL;
693 goto err;
694 }
695
696
697 rmcast = tipc_udp_is_mcast_addr(&remote);
698
699
700 if (!tipc_own_id(net)) {
701 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16);
702 tipc_net_init(net, node_id, 0);
703 }
704 if (!tipc_own_id(net)) {
705 pr_warn("Failed to set node id, please configure manually\n");
706 err = -EINVAL;
707 goto err;
708 }
709
710 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
711 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
712 rcu_assign_pointer(b->media_ptr, ub);
713 rcu_assign_pointer(ub->bearer, b);
714 tipc_udp_media_addr_set(&b->addr, &local);
715 if (local.proto == htons(ETH_P_IP)) {
716 struct net_device *dev;
717
718 dev = __ip_dev_find(net, local.ipv4.s_addr, false);
719 if (!dev) {
720 err = -ENODEV;
721 goto err;
722 }
723 udp_conf.family = AF_INET;
724
725
726 if (rmcast)
727 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
728 else
729 udp_conf.local_ip.s_addr = local.ipv4.s_addr;
730 udp_conf.use_udp_checksums = false;
731 ub->ifindex = dev->ifindex;
732 if (tipc_mtu_bad(dev, sizeof(struct iphdr) +
733 sizeof(struct udphdr))) {
734 err = -EINVAL;
735 goto err;
736 }
737 b->mtu = b->media->mtu;
738#if IS_ENABLED(CONFIG_IPV6)
739 } else if (local.proto == htons(ETH_P_IPV6)) {
740 udp_conf.family = AF_INET6;
741 udp_conf.use_udp6_tx_checksums = true;
742 udp_conf.use_udp6_rx_checksums = true;
743 if (rmcast)
744 udp_conf.local_ip6 = in6addr_any;
745 else
746 udp_conf.local_ip6 = local.ipv6;
747 b->mtu = 1280;
748#endif
749 } else {
750 err = -EAFNOSUPPORT;
751 goto err;
752 }
753 udp_conf.local_udp_port = local.port;
754 err = udp_sock_create(net, &udp_conf, &ub->ubsock);
755 if (err)
756 goto err;
757 tuncfg.sk_user_data = ub;
758 tuncfg.encap_type = 1;
759 tuncfg.encap_rcv = tipc_udp_recv;
760 tuncfg.encap_destroy = NULL;
761 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);
762
763 err = dst_cache_init(&ub->rcast.dst_cache, GFP_ATOMIC);
764 if (err)
765 goto free;
766
767
768
769
770
771 memcpy(&b->bcast_addr.value, &remote, sizeof(remote));
772 if (rmcast)
773 err = enable_mcast(ub, &remote);
774 else
775 err = tipc_udp_rcast_add(b, &remote);
776 if (err)
777 goto free;
778
779 return 0;
780
781free:
782 dst_cache_destroy(&ub->rcast.dst_cache);
783 udp_tunnel_sock_release(ub->ubsock);
784err:
785 kfree(ub);
786 return err;
787}
788
789
790static void cleanup_bearer(struct work_struct *work)
791{
792 struct udp_bearer *ub = container_of(work, struct udp_bearer, work);
793 struct udp_replicast *rcast, *tmp;
794
795 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
796 dst_cache_destroy(&rcast->dst_cache);
797 list_del_rcu(&rcast->list);
798 kfree_rcu(rcast, rcu);
799 }
800
801 dst_cache_destroy(&ub->rcast.dst_cache);
802 udp_tunnel_sock_release(ub->ubsock);
803 synchronize_net();
804 kfree(ub);
805}
806
807
808static void tipc_udp_disable(struct tipc_bearer *b)
809{
810 struct udp_bearer *ub;
811
812 ub = rtnl_dereference(b->media_ptr);
813 if (!ub) {
814 pr_err("UDP bearer instance not found\n");
815 return;
816 }
817 sock_set_flag(ub->ubsock->sk, SOCK_DEAD);
818 RCU_INIT_POINTER(ub->bearer, NULL);
819
820
821 INIT_WORK(&ub->work, cleanup_bearer);
822 schedule_work(&ub->work);
823}
824
825struct tipc_media udp_media_info = {
826 .send_msg = tipc_udp_send_msg,
827 .enable_media = tipc_udp_enable,
828 .disable_media = tipc_udp_disable,
829 .addr2str = tipc_udp_addr2str,
830 .addr2msg = tipc_udp_addr2msg,
831 .msg2addr = tipc_udp_msg2addr,
832 .priority = TIPC_DEF_LINK_PRI,
833 .tolerance = TIPC_DEF_LINK_TOL,
834 .window = TIPC_DEF_LINK_WIN,
835 .mtu = TIPC_DEF_LINK_UDP_MTU,
836 .type_id = TIPC_MEDIA_TYPE_UDP,
837 .hwaddr_len = 0,
838 .name = "udp"
839};
840
