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 rcu_head rcu; 80 struct list_head list; 81 }; 82 83 /** 84 * struct udp_bearer - ip/udp bearer data structure 85 * @bearer: associated generic tipc bearer 86 * @ubsock: bearer associated socket 87 * @ifindex: local address scope 88 * @work: used to schedule deferred work on a bearer 89 */ 90 struct udp_bearer { 91 struct tipc_bearer __rcu *bearer; 92 struct socket *ubsock; 93 u32 ifindex; 94 struct work_struct work; 95 struct udp_replicast rcast; 96 }; 97 98 static int tipc_udp_is_mcast_addr(struct udp_media_addr *addr) 99 { 100 if (ntohs(addr->proto) == ETH_P_IP) 101 return ipv4_is_multicast(addr->ipv4.s_addr); 102 #if IS_ENABLED(CONFIG_IPV6) 103 else 104 return ipv6_addr_is_multicast(&addr->ipv6); 105 #endif 106 return 0; 107 } 108 109 /* udp_media_addr_set - convert a ip/udp address to a TIPC media address */ 110 static void tipc_udp_media_addr_set(struct tipc_media_addr *addr, 111 struct udp_media_addr *ua) 112 { 113 memset(addr, 0, sizeof(struct tipc_media_addr)); 114 addr->media_id = TIPC_MEDIA_TYPE_UDP; 115 memcpy(addr->value, ua, sizeof(struct udp_media_addr)); 116 117 if (tipc_udp_is_mcast_addr(ua)) 118 addr->broadcast = TIPC_BROADCAST_SUPPORT; 119 } 120 121 /* tipc_udp_addr2str - convert ip/udp address to string */ 122 static int tipc_udp_addr2str(struct tipc_media_addr *a, char *buf, int size) 123 { 124 struct udp_media_addr *ua = (struct udp_media_addr *)&a->value; 125 126 if (ntohs(ua->proto) == ETH_P_IP) 127 snprintf(buf, size, "%pI4:%u", &ua->ipv4, ntohs(ua->port)); 128 else if (ntohs(ua->proto) == ETH_P_IPV6) 129 snprintf(buf, size, "%pI6:%u", &ua->ipv6, ntohs(ua->port)); 130 else 131 pr_err("Invalid UDP media address\n"); 132 return 0; 133 } 134 135 /* tipc_udp_msg2addr - extract an ip/udp address from a TIPC ndisc message */ 136 static int tipc_udp_msg2addr(struct tipc_bearer *b, struct tipc_media_addr *a, 137 char *msg) 138 { 139 struct udp_media_addr *ua; 140 141 ua = (struct udp_media_addr *) (msg + TIPC_MEDIA_ADDR_OFFSET); 142 if (msg[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_UDP) 143 return -EINVAL; 144 tipc_udp_media_addr_set(a, ua); 145 return 0; 146 } 147 148 /* tipc_udp_addr2msg - write an ip/udp address to a TIPC ndisc message */ 149 static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a) 150 { 151 memset(msg, 0, TIPC_MEDIA_INFO_SIZE); 152 msg[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_UDP; 153 memcpy(msg + TIPC_MEDIA_ADDR_OFFSET, a->value, 154 sizeof(struct udp_media_addr)); 155 return 0; 156 } 157 158 /* tipc_send_msg - enqueue a send request */ 159 static int tipc_udp_xmit(struct net *net, struct sk_buff *skb, 160 struct udp_bearer *ub, struct udp_media_addr *src, 161 struct udp_media_addr *dst) 162 { 163 int ttl, err = 0; 164 struct rtable *rt; 165 166 if (dst->proto == htons(ETH_P_IP)) { 167 struct flowi4 fl = { 168 .daddr = dst->ipv4.s_addr, 169 .saddr = src->ipv4.s_addr, 170 .flowi4_mark = skb->mark, 171 .flowi4_proto = IPPROTO_UDP 172 }; 173 rt = ip_route_output_key(net, &fl); 174 if (IS_ERR(rt)) { 175 err = PTR_ERR(rt); 176 goto tx_error; 177 } 178 179 ttl = ip4_dst_hoplimit(&rt->dst); 180 udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr, 181 dst->ipv4.s_addr, 0, ttl, 0, src->port, 182 dst->port, false, true); 183 #if IS_ENABLED(CONFIG_IPV6) 184 } else { 185 struct dst_entry *ndst; 186 struct flowi6 fl6 = { 187 .flowi6_oif = ub->ifindex, 188 .daddr = dst->ipv6, 189 .saddr = src->ipv6, 190 .flowi6_proto = IPPROTO_UDP 191 }; 192 err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst, 193 &fl6); 194 if (err) 195 goto tx_error; 196 ttl = ip6_dst_hoplimit(ndst); 197 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, NULL, 198 &src->ipv6, &dst->ipv6, 0, ttl, 0, 199 src->port, 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 != TIPC_REPLICAST_SUPPORT) 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 goto out; 248 } 249 err = 0; 250 out: 251 kfree_skb(skb); 252 return err; 253 } 254 255 static bool tipc_udp_is_known_peer(struct tipc_bearer *b, 256 struct udp_media_addr *addr) 257 { 258 struct udp_replicast *rcast, *tmp; 259 struct udp_bearer *ub; 260 261 ub = rcu_dereference_rtnl(b->media_ptr); 262 if (!ub) { 263 pr_err_ratelimited("UDP bearer instance not found\n"); 264 return false; 265 } 266 267 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 268 if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr))) 269 return true; 270 } 271 272 return false; 273 } 274 275 static int tipc_udp_rcast_add(struct tipc_bearer *b, 276 struct udp_media_addr *addr) 277 { 278 struct udp_replicast *rcast; 279 struct udp_bearer *ub; 280 281 ub = rcu_dereference_rtnl(b->media_ptr); 282 if (!ub) 283 return -ENODEV; 284 285 rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC); 286 if (!rcast) 287 return -ENOMEM; 288 289 memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr)); 290 291 if (ntohs(addr->proto) == ETH_P_IP) 292 pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4); 293 #if IS_ENABLED(CONFIG_IPV6) 294 else if (ntohs(addr->proto) == ETH_P_IPV6) 295 pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6); 296 #endif 297 b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT; 298 list_add_rcu(&rcast->list, &ub->rcast.list); 299 return 0; 300 } 301 302 static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb) 303 { 304 struct udp_media_addr src = {0}; 305 struct udp_media_addr *dst; 306 307 dst = (struct udp_media_addr *)&b->bcast_addr.value; 308 if (tipc_udp_is_mcast_addr(dst)) 309 return 0; 310 311 src.port = udp_hdr(skb)->source; 312 313 if (ip_hdr(skb)->version == 4) { 314 struct iphdr *iphdr = ip_hdr(skb); 315 316 src.proto = htons(ETH_P_IP); 317 src.ipv4.s_addr = iphdr->saddr; 318 if (ipv4_is_multicast(iphdr->daddr)) 319 return 0; 320 #if IS_ENABLED(CONFIG_IPV6) 321 } else if (ip_hdr(skb)->version == 6) { 322 struct ipv6hdr *iphdr = ipv6_hdr(skb); 323 324 src.proto = htons(ETH_P_IPV6); 325 src.ipv6 = iphdr->saddr; 326 if (ipv6_addr_is_multicast(&iphdr->daddr)) 327 return 0; 328 #endif 329 } else { 330 return 0; 331 } 332 333 if (likely(tipc_udp_is_known_peer(b, &src))) 334 return 0; 335 336 return tipc_udp_rcast_add(b, &src); 337 } 338 339 /* tipc_udp_recv - read data from bearer socket */ 340 static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb) 341 { 342 struct udp_bearer *ub; 343 struct tipc_bearer *b; 344 struct tipc_msg *hdr; 345 int err; 346 347 ub = rcu_dereference_sk_user_data(sk); 348 if (!ub) { 349 pr_err_ratelimited("Failed to get UDP bearer reference"); 350 goto out; 351 } 352 skb_pull(skb, sizeof(struct udphdr)); 353 hdr = buf_msg(skb); 354 355 b = rcu_dereference(ub->bearer); 356 if (!b) 357 goto out; 358 359 if (b && test_bit(0, &b->up)) { 360 tipc_rcv(sock_net(sk), skb, b); 361 return 0; 362 } 363 364 if (unlikely(msg_user(hdr) == LINK_CONFIG)) { 365 err = tipc_udp_rcast_disc(b, skb); 366 if (err) 367 goto out; 368 } 369 370 out: 371 kfree_skb(skb); 372 return 0; 373 } 374 375 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) 376 { 377 int err = 0; 378 struct ip_mreqn mreqn; 379 struct sock *sk = ub->ubsock->sk; 380 381 if (ntohs(remote->proto) == ETH_P_IP) { 382 mreqn.imr_multiaddr = remote->ipv4; 383 mreqn.imr_ifindex = ub->ifindex; 384 err = ip_mc_join_group(sk, &mreqn); 385 #if IS_ENABLED(CONFIG_IPV6) 386 } else { 387 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex, 388 &remote->ipv6); 389 #endif 390 } 391 return err; 392 } 393 394 static int __tipc_nl_add_udp_addr(struct sk_buff *skb, 395 struct udp_media_addr *addr, int nla_t) 396 { 397 if (ntohs(addr->proto) == ETH_P_IP) { 398 struct sockaddr_in ip4; 399 400 memset(&ip4, 0, sizeof(ip4)); 401 ip4.sin_family = AF_INET; 402 ip4.sin_port = addr->port; 403 ip4.sin_addr.s_addr = addr->ipv4.s_addr; 404 if (nla_put(skb, nla_t, sizeof(ip4), &ip4)) 405 return -EMSGSIZE; 406 407 #if IS_ENABLED(CONFIG_IPV6) 408 } else if (ntohs(addr->proto) == ETH_P_IPV6) { 409 struct sockaddr_in6 ip6; 410 411 memset(&ip6, 0, sizeof(ip6)); 412 ip6.sin6_family = AF_INET6; 413 ip6.sin6_port = addr->port; 414 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr)); 415 if (nla_put(skb, nla_t, sizeof(ip6), &ip6)) 416 return -EMSGSIZE; 417 #endif 418 } 419 420 return 0; 421 } 422 423 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb) 424 { 425 u32 bid = cb->args[0]; 426 u32 skip_cnt = cb->args[1]; 427 u32 portid = NETLINK_CB(cb->skb).portid; 428 struct udp_replicast *rcast, *tmp; 429 struct tipc_bearer *b; 430 struct udp_bearer *ub; 431 void *hdr; 432 int err; 433 int i; 434 435 if (!bid && !skip_cnt) { 436 struct net *net = sock_net(skb->sk); 437 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1]; 438 struct nlattr **attrs; 439 char *bname; 440 441 err = tipc_nlmsg_parse(cb->nlh, &attrs); 442 if (err) 443 return err; 444 445 if (!attrs[TIPC_NLA_BEARER]) 446 return -EINVAL; 447 448 err = nla_parse_nested_deprecated(battrs, TIPC_NLA_BEARER_MAX, 449 attrs[TIPC_NLA_BEARER], 450 tipc_nl_bearer_policy, NULL); 451 if (err) 452 return err; 453 454 if (!battrs[TIPC_NLA_BEARER_NAME]) 455 return -EINVAL; 456 457 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]); 458 459 rtnl_lock(); 460 b = tipc_bearer_find(net, bname); 461 if (!b) { 462 rtnl_unlock(); 463 return -EINVAL; 464 } 465 bid = b->identity; 466 } else { 467 struct net *net = sock_net(skb->sk); 468 struct tipc_net *tn = net_generic(net, tipc_net_id); 469 470 rtnl_lock(); 471 b = rtnl_dereference(tn->bearer_list[bid]); 472 if (!b) { 473 rtnl_unlock(); 474 return -EINVAL; 475 } 476 } 477 478 ub = rcu_dereference_rtnl(b->media_ptr); 479 if (!ub) { 480 rtnl_unlock(); 481 return -EINVAL; 482 } 483 484 i = 0; 485 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 486 if (i < skip_cnt) 487 goto count; 488 489 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq, 490 &tipc_genl_family, NLM_F_MULTI, 491 TIPC_NL_BEARER_GET); 492 if (!hdr) 493 goto done; 494 495 err = __tipc_nl_add_udp_addr(skb, &rcast->addr, 496 TIPC_NLA_UDP_REMOTE); 497 if (err) { 498 genlmsg_cancel(skb, hdr); 499 goto done; 500 } 501 genlmsg_end(skb, hdr); 502 count: 503 i++; 504 } 505 done: 506 rtnl_unlock(); 507 cb->args[0] = bid; 508 cb->args[1] = i; 509 510 return skb->len; 511 } 512 513 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b) 514 { 515 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; 516 struct udp_media_addr *dst; 517 struct udp_bearer *ub; 518 struct nlattr *nest; 519 520 ub = rcu_dereference_rtnl(b->media_ptr); 521 if (!ub) 522 return -ENODEV; 523 524 nest = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_UDP_OPTS); 525 if (!nest) 526 goto msg_full; 527 528 if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL)) 529 goto msg_full; 530 531 dst = (struct udp_media_addr *)&b->bcast_addr.value; 532 if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE)) 533 goto msg_full; 534 535 if (!list_empty(&ub->rcast.list)) { 536 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP)) 537 goto msg_full; 538 } 539 540 nla_nest_end(msg->skb, nest); 541 return 0; 542 msg_full: 543 nla_nest_cancel(msg->skb, nest); 544 return -EMSGSIZE; 545 } 546 547 /** 548 * tipc_parse_udp_addr - build udp media address from netlink data 549 * @nlattr: netlink attribute containing sockaddr storage aligned address 550 * @addr: tipc media address to fill with address, port and protocol type 551 * @scope_id: IPv6 scope id pointer, not NULL indicates it's required 552 */ 553 554 static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr, 555 u32 *scope_id) 556 { 557 struct sockaddr_storage sa; 558 559 nla_memcpy(&sa, nla, sizeof(sa)); 560 if (sa.ss_family == AF_INET) { 561 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa; 562 563 addr->proto = htons(ETH_P_IP); 564 addr->port = ip4->sin_port; 565 addr->ipv4.s_addr = ip4->sin_addr.s_addr; 566 return 0; 567 568 #if IS_ENABLED(CONFIG_IPV6) 569 } else if (sa.ss_family == AF_INET6) { 570 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa; 571 572 addr->proto = htons(ETH_P_IPV6); 573 addr->port = ip6->sin6_port; 574 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr)); 575 576 /* Scope ID is only interesting for local addresses */ 577 if (scope_id) { 578 int atype; 579 580 atype = ipv6_addr_type(&ip6->sin6_addr); 581 if (__ipv6_addr_needs_scope_id(atype) && 582 !ip6->sin6_scope_id) { 583 return -EINVAL; 584 } 585 586 *scope_id = ip6->sin6_scope_id ? : 0; 587 } 588 589 return 0; 590 #endif 591 } 592 return -EADDRNOTAVAIL; 593 } 594 595 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr) 596 { 597 int err; 598 struct udp_media_addr addr = {0}; 599 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 600 struct udp_media_addr *dst; 601 602 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy, NULL)) 603 return -EINVAL; 604 605 if (!opts[TIPC_NLA_UDP_REMOTE]) 606 return -EINVAL; 607 608 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL); 609 if (err) 610 return err; 611 612 dst = (struct udp_media_addr *)&b->bcast_addr.value; 613 if (tipc_udp_is_mcast_addr(dst)) { 614 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n"); 615 return -EINVAL; 616 } 617 618 if (tipc_udp_is_known_peer(b, &addr)) 619 return 0; 620 621 return tipc_udp_rcast_add(b, &addr); 622 } 623 624 /** 625 * tipc_udp_enable - callback to create a new udp bearer instance 626 * @net: network namespace 627 * @b: pointer to generic tipc_bearer 628 * @attrs: netlink bearer configuration 629 * 630 * validate the bearer parameters and initialize the udp bearer 631 * rtnl_lock should be held 632 */ 633 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, 634 struct nlattr *attrs[]) 635 { 636 int err = -EINVAL; 637 struct udp_bearer *ub; 638 struct udp_media_addr remote = {0}; 639 struct udp_media_addr local = {0}; 640 struct udp_port_cfg udp_conf = {0}; 641 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 642 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 643 u8 node_id[NODE_ID_LEN] = {0,}; 644 int rmcast = 0; 645 646 ub = kzalloc(sizeof(*ub), GFP_ATOMIC); 647 if (!ub) 648 return -ENOMEM; 649 650 INIT_LIST_HEAD(&ub->rcast.list); 651 652 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) 653 goto err; 654 655 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attrs[TIPC_NLA_BEARER_UDP_OPTS], tipc_nl_udp_policy, NULL)) 656 goto err; 657 658 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) { 659 pr_err("Invalid UDP bearer configuration"); 660 err = -EINVAL; 661 goto err; 662 } 663 664 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local, 665 &ub->ifindex); 666 if (err) 667 goto err; 668 669 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL); 670 if (err) 671 goto err; 672 673 if (remote.proto != local.proto) { 674 err = -EINVAL; 675 goto err; 676 } 677 678 /* Checking remote ip address */ 679 rmcast = tipc_udp_is_mcast_addr(&remote); 680 681 /* Autoconfigure own node identity if needed */ 682 if (!tipc_own_id(net)) { 683 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16); 684 tipc_net_init(net, node_id, 0); 685 } 686 if (!tipc_own_id(net)) { 687 pr_warn("Failed to set node id, please configure manually\n"); 688 err = -EINVAL; 689 goto err; 690 } 691 692 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; 693 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 694 rcu_assign_pointer(b->media_ptr, ub); 695 rcu_assign_pointer(ub->bearer, b); 696 tipc_udp_media_addr_set(&b->addr, &local); 697 if (local.proto == htons(ETH_P_IP)) { 698 struct net_device *dev; 699 700 dev = __ip_dev_find(net, local.ipv4.s_addr, false); 701 if (!dev) { 702 err = -ENODEV; 703 goto err; 704 } 705 udp_conf.family = AF_INET; 706 707 /* Switch to use ANY to receive packets from group */ 708 if (rmcast) 709 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 710 else 711 udp_conf.local_ip.s_addr = local.ipv4.s_addr; 712 udp_conf.use_udp_checksums = false; 713 ub->ifindex = dev->ifindex; 714 if (tipc_mtu_bad(dev, sizeof(struct iphdr) + 715 sizeof(struct udphdr))) { 716 err = -EINVAL; 717 goto err; 718 } 719 b->mtu = b->media->mtu; 720 #if IS_ENABLED(CONFIG_IPV6) 721 } else if (local.proto == htons(ETH_P_IPV6)) { 722 udp_conf.family = AF_INET6; 723 udp_conf.use_udp6_tx_checksums = true; 724 udp_conf.use_udp6_rx_checksums = true; 725 if (rmcast) 726 udp_conf.local_ip6 = in6addr_any; 727 else 728 udp_conf.local_ip6 = local.ipv6; 729 b->mtu = 1280; 730 #endif 731 } else { 732 err = -EAFNOSUPPORT; 733 goto err; 734 } 735 udp_conf.local_udp_port = local.port; 736 err = udp_sock_create(net, &udp_conf, &ub->ubsock); 737 if (err) 738 goto err; 739 tuncfg.sk_user_data = ub; 740 tuncfg.encap_type = 1; 741 tuncfg.encap_rcv = tipc_udp_recv; 742 tuncfg.encap_destroy = NULL; 743 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg); 744 745 /** 746 * The bcast media address port is used for all peers and the ip 747 * is used if it's a multicast address. 748 */ 749 memcpy(&b->bcast_addr.value, &remote, sizeof(remote)); 750 if (rmcast) 751 err = enable_mcast(ub, &remote); 752 else 753 err = tipc_udp_rcast_add(b, &remote); 754 if (err) 755 goto err; 756 757 return 0; 758 err: 759 if (ub->ubsock) 760 udp_tunnel_sock_release(ub->ubsock); 761 kfree(ub); 762 return err; 763 } 764 765 /* cleanup_bearer - break the socket/bearer association */ 766 static void cleanup_bearer(struct work_struct *work) 767 { 768 struct udp_bearer *ub = container_of(work, struct udp_bearer, work); 769 struct udp_replicast *rcast, *tmp; 770 771 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 772 list_del_rcu(&rcast->list); 773 kfree_rcu(rcast, rcu); 774 } 775 776 if (ub->ubsock) 777 udp_tunnel_sock_release(ub->ubsock); 778 synchronize_net(); 779 kfree(ub); 780 } 781 782 /* tipc_udp_disable - detach bearer from socket */ 783 static void tipc_udp_disable(struct tipc_bearer *b) 784 { 785 struct udp_bearer *ub; 786 787 ub = rcu_dereference_rtnl(b->media_ptr); 788 if (!ub) { 789 pr_err("UDP bearer instance not found\n"); 790 return; 791 } 792 if (ub->ubsock) 793 sock_set_flag(ub->ubsock->sk, SOCK_DEAD); 794 RCU_INIT_POINTER(ub->bearer, NULL); 795 796 /* sock_release need to be done outside of rtnl lock */ 797 INIT_WORK(&ub->work, cleanup_bearer); 798 schedule_work(&ub->work); 799 } 800 801 struct tipc_media udp_media_info = { 802 .send_msg = tipc_udp_send_msg, 803 .enable_media = tipc_udp_enable, 804 .disable_media = tipc_udp_disable, 805 .addr2str = tipc_udp_addr2str, 806 .addr2msg = tipc_udp_addr2msg, 807 .msg2addr = tipc_udp_msg2addr, 808 .priority = TIPC_DEF_LINK_PRI, 809 .tolerance = TIPC_DEF_LINK_TOL, 810 .window = TIPC_DEF_LINK_WIN, 811 .mtu = TIPC_DEF_LINK_UDP_MTU, 812 .type_id = TIPC_MEDIA_TYPE_UDP, 813 .hwaddr_len = 0, 814 .name = "udp" 815 }; 816