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 */ 65 struct 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 */ 75 struct 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 */ 88 struct 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 96 static 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 */ 108 static 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 */ 120 static 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 */ 134 static 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 */ 147 static 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 */ 157 static 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; 203 204 tx_error: 205 kfree_skb(skb); 206 return err; 207 } 208 209 static 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; 252 out: 253 kfree_skb(skb); 254 return err; 255 } 256 257 static 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 } 276 277 static 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 } 303 304 static 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 */ 342 static 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; 377 378 rcu_out: 379 rcu_read_unlock(); 380 out: 381 kfree_skb(skb); 382 return 0; 383 } 384 385 static 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 } 403 404 static 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 ip4.sin_family = AF_INET; 411 ip4.sin_port = addr->port; 412 ip4.sin_addr.s_addr = addr->ipv4.s_addr; 413 if (nla_put(skb, nla_t, sizeof(ip4), &ip4)) 414 return -EMSGSIZE; 415 416 #if IS_ENABLED(CONFIG_IPV6) 417 } else if (ntohs(addr->proto) == ETH_P_IPV6) { 418 struct sockaddr_in6 ip6; 419 420 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 } 430 431 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], 458 tipc_nl_bearer_policy); 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 } 520 521 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 } 554 555 /** 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 560 */ 561 562 static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr, 563 u32 *scope_id) 564 { 565 struct sockaddr_storage sa; 566 567 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; 574 return 0; 575 576 #if IS_ENABLED(CONFIG_IPV6) 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 } 596 597 return 0; 598 #endif 599 } 600 return -EADDRNOTAVAIL; 601 } 602 603 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; 609 610 if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy)) 611 return -EINVAL; 612 613 if (!opts[TIPC_NLA_UDP_REMOTE]) 614 return -EINVAL; 615 616 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL); 617 if (err) 618 return err; 619 620 dst = (struct udp_media_addr *)&b->bcast_addr.value; 621 if (tipc_udp_is_mcast_addr(dst)) { 622 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n"); 623 return -EINVAL; 624 } 625 626 if (tipc_udp_is_known_peer(b, &addr)) 627 return 0; 628 629 return tipc_udp_rcast_add(b, &addr); 630 } 631 632 /** 633 * tipc_udp_enable - callback to create a new udp bearer instance 634 * @net: network namespace 635 * @b: pointer to generic tipc_bearer 636 * @attrs: netlink bearer configuration 637 * 638 * validate the bearer parameters and initialize the udp bearer 639 * rtnl_lock should be held 640 */ 641 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, 642 struct nlattr *attrs[]) 643 { 644 int err = -EINVAL; 645 struct udp_bearer *ub; 646 struct udp_media_addr remote = {0}; 647 struct udp_media_addr local = {0}; 648 struct udp_port_cfg udp_conf = {0}; 649 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 650 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 651 652 ub = kzalloc(sizeof(*ub), GFP_ATOMIC); 653 if (!ub) 654 return -ENOMEM; 655 656 INIT_LIST_HEAD(&ub->rcast.list); 657 658 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) 659 goto err; 660 661 if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, 662 attrs[TIPC_NLA_BEARER_UDP_OPTS], 663 tipc_nl_udp_policy)) 664 goto err; 665 666 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) { 667 pr_err("Invalid UDP bearer configuration"); 668 err = -EINVAL; 669 goto err; 670 } 671 672 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local, 673 &ub->ifindex); 674 if (err) 675 goto err; 676 677 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL); 678 if (err) 679 goto err; 680 681 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; 682 b->bcast_addr.broadcast = 1; 683 rcu_assign_pointer(b->media_ptr, ub); 684 rcu_assign_pointer(ub->bearer, b); 685 tipc_udp_media_addr_set(&b->addr, &local); 686 if (local.proto == htons(ETH_P_IP)) { 687 struct net_device *dev; 688 689 dev = __ip_dev_find(net, local.ipv4.s_addr, false); 690 if (!dev) { 691 err = -ENODEV; 692 goto err; 693 } 694 udp_conf.family = AF_INET; 695 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 696 udp_conf.use_udp_checksums = false; 697 ub->ifindex = dev->ifindex; 698 b->mtu = dev->mtu - sizeof(struct iphdr) 699 - sizeof(struct udphdr); 700 #if IS_ENABLED(CONFIG_IPV6) 701 } else if (local.proto == htons(ETH_P_IPV6)) { 702 udp_conf.family = AF_INET6; 703 udp_conf.use_udp6_tx_checksums = true; 704 udp_conf.use_udp6_rx_checksums = true; 705 udp_conf.local_ip6 = in6addr_any; 706 b->mtu = 1280; 707 #endif 708 } else { 709 err = -EAFNOSUPPORT; 710 goto err; 711 } 712 udp_conf.local_udp_port = local.port; 713 err = udp_sock_create(net, &udp_conf, &ub->ubsock); 714 if (err) 715 goto err; 716 tuncfg.sk_user_data = ub; 717 tuncfg.encap_type = 1; 718 tuncfg.encap_rcv = tipc_udp_recv; 719 tuncfg.encap_destroy = NULL; 720 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg); 721 722 /** 723 * The bcast media address port is used for all peers and the ip 724 * is used if it's a multicast address. 725 */ 726 memcpy(&b->bcast_addr.value, &remote, sizeof(remote)); 727 if (tipc_udp_is_mcast_addr(&remote)) 728 err = enable_mcast(ub, &remote); 729 else 730 err = tipc_udp_rcast_add(b, &remote); 731 if (err) 732 goto err; 733 734 return 0; 735 err: 736 if (ub->ubsock) 737 udp_tunnel_sock_release(ub->ubsock); 738 kfree(ub); 739 return err; 740 } 741 742 /* cleanup_bearer - break the socket/bearer association */ 743 static void cleanup_bearer(struct work_struct *work) 744 { 745 struct udp_bearer *ub = container_of(work, struct udp_bearer, work); 746 struct udp_replicast *rcast, *tmp; 747 748 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 749 list_del_rcu(&rcast->list); 750 kfree_rcu(rcast, rcu); 751 } 752 753 if (ub->ubsock) 754 udp_tunnel_sock_release(ub->ubsock); 755 synchronize_net(); 756 kfree(ub); 757 } 758 759 /* tipc_udp_disable - detach bearer from socket */ 760 static void tipc_udp_disable(struct tipc_bearer *b) 761 { 762 struct udp_bearer *ub; 763 764 ub = rcu_dereference_rtnl(b->media_ptr); 765 if (!ub) { 766 pr_err("UDP bearer instance not found\n"); 767 return; 768 } 769 if (ub->ubsock) 770 sock_set_flag(ub->ubsock->sk, SOCK_DEAD); 771 RCU_INIT_POINTER(ub->bearer, NULL); 772 773 /* sock_release need to be done outside of rtnl lock */ 774 INIT_WORK(&ub->work, cleanup_bearer); 775 schedule_work(&ub->work); 776 } 777 778 struct tipc_media udp_media_info = { 779 .send_msg = tipc_udp_send_msg, 780 .enable_media = tipc_udp_enable, 781 .disable_media = tipc_udp_disable, 782 .addr2str = tipc_udp_addr2str, 783 .addr2msg = tipc_udp_addr2msg, 784 .msg2addr = tipc_udp_msg2addr, 785 .priority = TIPC_DEF_LINK_PRI, 786 .tolerance = TIPC_DEF_LINK_TOL, 787 .window = TIPC_DEF_LINK_WIN, 788 .type_id = TIPC_MEDIA_TYPE_UDP, 789 .hwaddr_len = 0, 790 .name = "udp" 791 }; 792