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Linux 5.7.7
[linux/fpc-iii.git] / net / tipc / udp_media.c
blob28a283f26a8dff24d613e6ed57e5e69d894dae66
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
56 /* IANA assigned UDP port */
57 #define UDP_PORT_DEFAULT 6118
58
59 #define UDP_MIN_HEADROOM 48
60
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;
69 __be16 port;
70 union {
71 struct in_addr ipv4;
72 struct in6_addr ipv6;
73 };
74 };
75
76 /* struct udp_replicast - container for UDP remote addresses */
77 struct 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 * struct udp_bearer - ip/udp bearer data structure
86 * @bearer: associated generic tipc bearer
87 * @ubsock: bearer associated socket
88 * @ifindex: local address scope
89 * @work: used to schedule deferred work on a bearer
90 */
91 struct 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
99 static 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 /* udp_media_addr_set - convert a ip/udp address to a TIPC media address */
111 static 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 /* tipc_udp_addr2str - convert ip/udp address to string */
123 static 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 /* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */
137 static 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 /* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */
150 static 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 /* tipc_send_msg - enqueue a send request */
160 static 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;
165 int ttl, err = 0;
166
167 local_bh_disable();
168 ndst = dst_cache_get(cache);
169 if (dst->proto == htons(ETH_P_IP)) {
170 struct rtable *rt = (struct rtable *)ndst;
171
172 if (!rt) {
173 struct flowi4 fl = {
174 .daddr = dst->ipv4.s_addr,
175 .saddr = src->ipv4.s_addr,
176 .flowi4_mark = skb->mark,
177 .flowi4_proto = IPPROTO_UDP
178 };
179 rt = ip_route_output_key(net, &fl);
180 if (IS_ERR(rt)) {
181 err = PTR_ERR(rt);
182 goto tx_error;
183 }
184 dst_cache_set_ip4(cache, &rt->dst, fl.saddr);
185 }
186
187 ttl = ip4_dst_hoplimit(&rt->dst);
188 udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr,
189 dst->ipv4.s_addr, 0, ttl, 0, src->port,
190 dst->port, false, true);
191 #if IS_ENABLED(CONFIG_IPV6)
192 } else {
193 if (!ndst) {
194 struct flowi6 fl6 = {
195 .flowi6_oif = ub->ifindex,
196 .daddr = dst->ipv6,
197 .saddr = src->ipv6,
198 .flowi6_proto = IPPROTO_UDP
199 };
200 ndst = ipv6_stub->ipv6_dst_lookup_flow(net,
201 ub->ubsock->sk,
202 &fl6, NULL);
203 if (IS_ERR(ndst)) {
204 err = PTR_ERR(ndst);
205 goto tx_error;
206 }
207 dst_cache_set_ip6(cache, ndst, &fl6.saddr);
208 }
209 ttl = ip6_dst_hoplimit(ndst);
210 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, NULL,
211 &src->ipv6, &dst->ipv6, 0, ttl, 0,
212 src->port, dst->port, false);
213 #endif
214 }
215 local_bh_enable();
216 return err;
217
218 tx_error:
219 local_bh_enable();
220 kfree_skb(skb);
221 return err;
222 }
223
224 static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
225 struct tipc_bearer *b,
226 struct tipc_media_addr *addr)
227 {
228 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
229 struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value;
230 struct udp_replicast *rcast;
231 struct udp_bearer *ub;
232 int err = 0;
233
234 if (skb_headroom(skb) < UDP_MIN_HEADROOM) {
235 err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC);
236 if (err)
237 goto out;
238 }
239
240 skb_set_inner_protocol(skb, htons(ETH_P_TIPC));
241 ub = rcu_dereference(b->media_ptr);
242 if (!ub) {
243 err = -ENODEV;
244 goto out;
245 }
246
247 if (addr->broadcast != TIPC_REPLICAST_SUPPORT)
248 return tipc_udp_xmit(net, skb, ub, src, dst,
249 &ub->rcast.dst_cache);
250
251 /* Replicast, send an skb to each configured IP address */
252 list_for_each_entry_rcu(rcast, &ub->rcast.list, list) {
253 struct sk_buff *_skb;
254
255 _skb = pskb_copy(skb, GFP_ATOMIC);
256 if (!_skb) {
257 err = -ENOMEM;
258 goto out;
259 }
260
261 err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr,
262 &rcast->dst_cache);
263 if (err)
264 goto out;
265 }
266 err = 0;
267 out:
268 kfree_skb(skb);
269 return err;
270 }
271
272 static bool tipc_udp_is_known_peer(struct tipc_bearer *b,
273 struct udp_media_addr *addr)
274 {
275 struct udp_replicast *rcast, *tmp;
276 struct udp_bearer *ub;
277
278 ub = rcu_dereference_rtnl(b->media_ptr);
279 if (!ub) {
280 pr_err_ratelimited("UDP bearer instance not found\n");
281 return false;
282 }
283
284 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
285 if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr)))
286 return true;
287 }
288
289 return false;
290 }
291
292 static int tipc_udp_rcast_add(struct tipc_bearer *b,
293 struct udp_media_addr *addr)
294 {
295 struct udp_replicast *rcast;
296 struct udp_bearer *ub;
297
298 ub = rcu_dereference_rtnl(b->media_ptr);
299 if (!ub)
300 return -ENODEV;
301
302 rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC);
303 if (!rcast)
304 return -ENOMEM;
305
306 if (dst_cache_init(&rcast->dst_cache, GFP_ATOMIC)) {
307 kfree(rcast);
308 return -ENOMEM;
309 }
310
311 memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr));
312
313 if (ntohs(addr->proto) == ETH_P_IP)
314 pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4);
315 #if IS_ENABLED(CONFIG_IPV6)
316 else if (ntohs(addr->proto) == ETH_P_IPV6)
317 pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6);
318 #endif
319 b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT;
320 list_add_rcu(&rcast->list, &ub->rcast.list);
321 return 0;
322 }
323
324 static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb)
325 {
326 struct udp_media_addr src = {0};
327 struct udp_media_addr *dst;
328
329 dst = (struct udp_media_addr *)&b->bcast_addr.value;
330 if (tipc_udp_is_mcast_addr(dst))
331 return 0;
332
333 src.port = udp_hdr(skb)->source;
334
335 if (ip_hdr(skb)->version == 4) {
336 struct iphdr *iphdr = ip_hdr(skb);
337
338 src.proto = htons(ETH_P_IP);
339 src.ipv4.s_addr = iphdr->saddr;
340 if (ipv4_is_multicast(iphdr->daddr))
341 return 0;
342 #if IS_ENABLED(CONFIG_IPV6)
343 } else if (ip_hdr(skb)->version == 6) {
344 struct ipv6hdr *iphdr = ipv6_hdr(skb);
345
346 src.proto = htons(ETH_P_IPV6);
347 src.ipv6 = iphdr->saddr;
348 if (ipv6_addr_is_multicast(&iphdr->daddr))
349 return 0;
350 #endif
351 } else {
352 return 0;
353 }
354
355 if (likely(tipc_udp_is_known_peer(b, &src)))
356 return 0;
357
358 return tipc_udp_rcast_add(b, &src);
359 }
360
361 /* tipc_udp_recv - read data from bearer socket */
362 static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb)
363 {
364 struct udp_bearer *ub;
365 struct tipc_bearer *b;
366 struct tipc_msg *hdr;
367 int err;
368
369 ub = rcu_dereference_sk_user_data(sk);
370 if (!ub) {
371 pr_err_ratelimited("Failed to get UDP bearer reference");
372 goto out;
373 }
374 skb_pull(skb, sizeof(struct udphdr));
375 hdr = buf_msg(skb);
376
377 b = rcu_dereference(ub->bearer);
378 if (!b)
379 goto out;
380
381 if (b && test_bit(0, &b->up)) {
382 TIPC_SKB_CB(skb)->flags = 0;
383 tipc_rcv(sock_net(sk), skb, b);
384 return 0;
385 }
386
387 if (unlikely(msg_user(hdr) == LINK_CONFIG)) {
388 err = tipc_udp_rcast_disc(b, skb);
389 if (err)
390 goto out;
391 }
392
393 out:
394 kfree_skb(skb);
395 return 0;
396 }
397
398 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
399 {
400 int err = 0;
401 struct ip_mreqn mreqn;
402 struct sock *sk = ub->ubsock->sk;
403
404 if (ntohs(remote->proto) == ETH_P_IP) {
405 mreqn.imr_multiaddr = remote->ipv4;
406 mreqn.imr_ifindex = ub->ifindex;
407 err = ip_mc_join_group(sk, &mreqn);
408 #if IS_ENABLED(CONFIG_IPV6)
409 } else {
410 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex,
411 &remote->ipv6);
412 #endif
413 }
414 return err;
415 }
416
417 static int __tipc_nl_add_udp_addr(struct sk_buff *skb,
418 struct udp_media_addr *addr, int nla_t)
419 {
420 if (ntohs(addr->proto) == ETH_P_IP) {
421 struct sockaddr_in ip4;
422
423 memset(&ip4, 0, sizeof(ip4));
424 ip4.sin_family = AF_INET;
425 ip4.sin_port = addr->port;
426 ip4.sin_addr.s_addr = addr->ipv4.s_addr;
427 if (nla_put(skb, nla_t, sizeof(ip4), &ip4))
428 return -EMSGSIZE;
429
430 #if IS_ENABLED(CONFIG_IPV6)
431 } else if (ntohs(addr->proto) == ETH_P_IPV6) {
432 struct sockaddr_in6 ip6;
433
434 memset(&ip6, 0, sizeof(ip6));
435 ip6.sin6_family = AF_INET6;
436 ip6.sin6_port = addr->port;
437 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr));
438 if (nla_put(skb, nla_t, sizeof(ip6), &ip6))
439 return -EMSGSIZE;
440 #endif
441 }
442
443 return 0;
444 }
445
446 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb)
447 {
448 u32 bid = cb->args[0];
449 u32 skip_cnt = cb->args[1];
450 u32 portid = NETLINK_CB(cb->skb).portid;
451 struct udp_replicast *rcast, *tmp;
452 struct tipc_bearer *b;
453 struct udp_bearer *ub;
454 void *hdr;
455 int err;
456 int i;
457
458 if (!bid && !skip_cnt) {
459 struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
460 struct net *net = sock_net(skb->sk);
461 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1];
462 char *bname;
463
464 if (!attrs[TIPC_NLA_BEARER])
465 return -EINVAL;
466
467 err = nla_parse_nested_deprecated(battrs, TIPC_NLA_BEARER_MAX,
468 attrs[TIPC_NLA_BEARER],
469 tipc_nl_bearer_policy, NULL);
470 if (err)
471 return err;
472
473 if (!battrs[TIPC_NLA_BEARER_NAME])
474 return -EINVAL;
475
476 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]);
477
478 rtnl_lock();
479 b = tipc_bearer_find(net, bname);
480 if (!b) {
481 rtnl_unlock();
482 return -EINVAL;
483 }
484 bid = b->identity;
485 } else {
486 struct net *net = sock_net(skb->sk);
487 struct tipc_net *tn = net_generic(net, tipc_net_id);
488
489 rtnl_lock();
490 b = rtnl_dereference(tn->bearer_list[bid]);
491 if (!b) {
492 rtnl_unlock();
493 return -EINVAL;
494 }
495 }
496
497 ub = rtnl_dereference(b->media_ptr);
498 if (!ub) {
499 rtnl_unlock();
500 return -EINVAL;
501 }
502
503 i = 0;
504 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
505 if (i < skip_cnt)
506 goto count;
507
508 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq,
509 &tipc_genl_family, NLM_F_MULTI,
510 TIPC_NL_BEARER_GET);
511 if (!hdr)
512 goto done;
513
514 err = __tipc_nl_add_udp_addr(skb, &rcast->addr,
515 TIPC_NLA_UDP_REMOTE);
516 if (err) {
517 genlmsg_cancel(skb, hdr);
518 goto done;
519 }
520 genlmsg_end(skb, hdr);
521 count:
522 i++;
523 }
524 done:
525 rtnl_unlock();
526 cb->args[0] = bid;
527 cb->args[1] = i;
528
529 return skb->len;
530 }
531
532 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b)
533 {
534 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
535 struct udp_media_addr *dst;
536 struct udp_bearer *ub;
537 struct nlattr *nest;
538
539 ub = rtnl_dereference(b->media_ptr);
540 if (!ub)
541 return -ENODEV;
542
543 nest = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_UDP_OPTS);
544 if (!nest)
545 goto msg_full;
546
547 if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL))
548 goto msg_full;
549
550 dst = (struct udp_media_addr *)&b->bcast_addr.value;
551 if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE))
552 goto msg_full;
553
554 if (!list_empty(&ub->rcast.list)) {
555 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP))
556 goto msg_full;
557 }
558
559 nla_nest_end(msg->skb, nest);
560 return 0;
561 msg_full:
562 nla_nest_cancel(msg->skb, nest);
563 return -EMSGSIZE;
564 }
565
566 /**
567 * tipc_parse_udp_addr - build udp media address from netlink data
568 * @nlattr: netlink attribute containing sockaddr storage aligned address
569 * @addr: tipc media address to fill with address, port and protocol type
570 * @scope_id: IPv6 scope id pointer, not NULL indicates it's required
571 */
572
573 static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr,
574 u32 *scope_id)
575 {
576 struct sockaddr_storage sa;
577
578 nla_memcpy(&sa, nla, sizeof(sa));
579 if (sa.ss_family == AF_INET) {
580 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa;
581
582 addr->proto = htons(ETH_P_IP);
583 addr->port = ip4->sin_port;
584 addr->ipv4.s_addr = ip4->sin_addr.s_addr;
585 return 0;
586
587 #if IS_ENABLED(CONFIG_IPV6)
588 } else if (sa.ss_family == AF_INET6) {
589 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa;
590
591 addr->proto = htons(ETH_P_IPV6);
592 addr->port = ip6->sin6_port;
593 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr));
594
595 /* Scope ID is only interesting for local addresses */
596 if (scope_id) {
597 int atype;
598
599 atype = ipv6_addr_type(&ip6->sin6_addr);
600 if (__ipv6_addr_needs_scope_id(atype) &&
601 !ip6->sin6_scope_id) {
602 return -EINVAL;
603 }
604
605 *scope_id = ip6->sin6_scope_id ? : 0;
606 }
607
608 return 0;
609 #endif
610 }
611 return -EADDRNOTAVAIL;
612 }
613
614 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr)
615 {
616 int err;
617 struct udp_media_addr addr = {0};
618 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
619 struct udp_media_addr *dst;
620
621 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy, NULL))
622 return -EINVAL;
623
624 if (!opts[TIPC_NLA_UDP_REMOTE])
625 return -EINVAL;
626
627 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL);
628 if (err)
629 return err;
630
631 dst = (struct udp_media_addr *)&b->bcast_addr.value;
632 if (tipc_udp_is_mcast_addr(dst)) {
633 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n");
634 return -EINVAL;
635 }
636
637 if (tipc_udp_is_known_peer(b, &addr))
638 return 0;
639
640 return tipc_udp_rcast_add(b, &addr);
641 }
642
643 /**
644 * tipc_udp_enable - callback to create a new udp bearer instance
645 * @net: network namespace
646 * @b: pointer to generic tipc_bearer
647 * @attrs: netlink bearer configuration
648 *
649 * validate the bearer parameters and initialize the udp bearer
650 * rtnl_lock should be held
651 */
652 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
653 struct nlattr *attrs[])
654 {
655 int err = -EINVAL;
656 struct udp_bearer *ub;
657 struct udp_media_addr remote = {0};
658 struct udp_media_addr local = {0};
659 struct udp_port_cfg udp_conf = {0};
660 struct udp_tunnel_sock_cfg tuncfg = {NULL};
661 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1];
662 u8 node_id[NODE_ID_LEN] = {0,};
663 int rmcast = 0;
664
665 ub = kzalloc(sizeof(*ub), GFP_ATOMIC);
666 if (!ub)
667 return -ENOMEM;
668
669 INIT_LIST_HEAD(&ub->rcast.list);
670
671 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS])
672 goto err;
673
674 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attrs[TIPC_NLA_BEARER_UDP_OPTS], tipc_nl_udp_policy, NULL))
675 goto err;
676
677 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) {
678 pr_err("Invalid UDP bearer configuration");
679 err = -EINVAL;
680 goto err;
681 }
682
683 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local,
684 &ub->ifindex);
685 if (err)
686 goto err;
687
688 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL);
689 if (err)
690 goto err;
691
692 if (remote.proto != local.proto) {
693 err = -EINVAL;
694 goto err;
695 }
696
697 /* Checking remote ip address */
698 rmcast = tipc_udp_is_mcast_addr(&remote);
699
700 /* Autoconfigure own node identity if needed */
701 if (!tipc_own_id(net)) {
702 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16);
703 tipc_net_init(net, node_id, 0);
704 }
705 if (!tipc_own_id(net)) {
706 pr_warn("Failed to set node id, please configure manually\n");
707 err = -EINVAL;
708 goto err;
709 }
710
711 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP;
712 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
713 rcu_assign_pointer(b->media_ptr, ub);
714 rcu_assign_pointer(ub->bearer, b);
715 tipc_udp_media_addr_set(&b->addr, &local);
716 if (local.proto == htons(ETH_P_IP)) {
717 struct net_device *dev;
718
719 dev = __ip_dev_find(net, local.ipv4.s_addr, false);
720 if (!dev) {
721 err = -ENODEV;
722 goto err;
723 }
724 udp_conf.family = AF_INET;
725
726 /* Switch to use ANY to receive packets from group */
727 if (rmcast)
728 udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
729 else
730 udp_conf.local_ip.s_addr = local.ipv4.s_addr;
731 udp_conf.use_udp_checksums = false;
732 ub->ifindex = dev->ifindex;
733 if (tipc_mtu_bad(dev, sizeof(struct iphdr) +
734 sizeof(struct udphdr))) {
735 err = -EINVAL;
736 goto err;
737 }
738 b->mtu = b->media->mtu;
739 #if IS_ENABLED(CONFIG_IPV6)
740 } else if (local.proto == htons(ETH_P_IPV6)) {
741 udp_conf.family = AF_INET6;
742 udp_conf.use_udp6_tx_checksums = true;
743 udp_conf.use_udp6_rx_checksums = true;
744 if (rmcast)
745 udp_conf.local_ip6 = in6addr_any;
746 else
747 udp_conf.local_ip6 = local.ipv6;
748 b->mtu = 1280;
749 #endif
750 } else {
751 err = -EAFNOSUPPORT;
752 goto err;
753 }
754 udp_conf.local_udp_port = local.port;
755 err = udp_sock_create(net, &udp_conf, &ub->ubsock);
756 if (err)
757 goto err;
758 tuncfg.sk_user_data = ub;
759 tuncfg.encap_type = 1;
760 tuncfg.encap_rcv = tipc_udp_recv;
761 tuncfg.encap_destroy = NULL;
762 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);
763
764 err = dst_cache_init(&ub->rcast.dst_cache, GFP_ATOMIC);
765 if (err)
766 goto free;
767
768 /**
769 * The bcast media address port is used for all peers and the ip
770 * is used if it's a multicast address.
771 */
772 memcpy(&b->bcast_addr.value, &remote, sizeof(remote));
773 if (rmcast)
774 err = enable_mcast(ub, &remote);
775 else
776 err = tipc_udp_rcast_add(b, &remote);
777 if (err)
778 goto free;
779
780 return 0;
781
782 free:
783 dst_cache_destroy(&ub->rcast.dst_cache);
784 udp_tunnel_sock_release(ub->ubsock);
785 err:
786 kfree(ub);
787 return err;
788 }
789
790 /* cleanup_bearer - break the socket/bearer association */
791 static void cleanup_bearer(struct work_struct *work)
792 {
793 struct udp_bearer *ub = container_of(work, struct udp_bearer, work);
794 struct udp_replicast *rcast, *tmp;
795
796 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {
797 dst_cache_destroy(&rcast->dst_cache);
798 list_del_rcu(&rcast->list);
799 kfree_rcu(rcast, rcu);
800 }
801
802 dst_cache_destroy(&ub->rcast.dst_cache);
803 udp_tunnel_sock_release(ub->ubsock);
804 synchronize_net();
805 kfree(ub);
806 }
807
808 /* tipc_udp_disable - detach bearer from socket */
809 static void tipc_udp_disable(struct tipc_bearer *b)
810 {
811 struct udp_bearer *ub;
812
813 ub = rtnl_dereference(b->media_ptr);
814 if (!ub) {
815 pr_err("UDP bearer instance not found\n");
816 return;
817 }
818 sock_set_flag(ub->ubsock->sk, SOCK_DEAD);
819 RCU_INIT_POINTER(ub->bearer, NULL);
820
821 /* sock_release need to be done outside of rtnl lock */
822 INIT_WORK(&ub->work, cleanup_bearer);
823 schedule_work(&ub->work);
824 }
825
826 struct tipc_media udp_media_info = {
827 .send_msg = tipc_udp_send_msg,
828 .enable_media = tipc_udp_enable,
829 .disable_media = tipc_udp_disable,
830 .addr2str = tipc_udp_addr2str,
831 .addr2msg = tipc_udp_addr2msg,
832 .msg2addr = tipc_udp_msg2addr,
833 .priority = TIPC_DEF_LINK_PRI,
834 .tolerance = TIPC_DEF_LINK_TOL,
835 .min_win = TIPC_DEF_LINK_WIN,
836 .max_win = TIPC_DEF_LINK_WIN,
837 .mtu = TIPC_DEF_LINK_UDP_MTU,
838 .type_id = TIPC_MEDIA_TYPE_UDP,
839 .hwaddr_len = 0,
840 .name = "udp"
841 };
Linux with added FPC-III support