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 skb->dev = rt->dst.dev; 180 ttl = ip4_dst_hoplimit(&rt->dst); 181 udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr, 182 dst->ipv4.s_addr, 0, ttl, 0, src->port, 183 dst->port, false, true); 184 #if IS_ENABLED(CONFIG_IPV6) 185 } else { 186 struct dst_entry *ndst; 187 struct flowi6 fl6 = { 188 .flowi6_oif = ub->ifindex, 189 .daddr = dst->ipv6, 190 .saddr = src->ipv6, 191 .flowi6_proto = IPPROTO_UDP 192 }; 193 err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst, 194 &fl6); 195 if (err) 196 goto tx_error; 197 ttl = ip6_dst_hoplimit(ndst); 198 err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, 199 ndst->dev, &src->ipv6, 200 &dst->ipv6, 0, ttl, 0, src->port, 201 dst->port, false); 202 #endif 203 } 204 return err; 205 206 tx_error: 207 kfree_skb(skb); 208 return err; 209 } 210 211 static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb, 212 struct tipc_bearer *b, 213 struct tipc_media_addr *addr) 214 { 215 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; 216 struct udp_media_addr *dst = (struct udp_media_addr *)&addr->value; 217 struct udp_replicast *rcast; 218 struct udp_bearer *ub; 219 int err = 0; 220 221 if (skb_headroom(skb) < UDP_MIN_HEADROOM) { 222 err = pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC); 223 if (err) 224 goto out; 225 } 226 227 skb_set_inner_protocol(skb, htons(ETH_P_TIPC)); 228 ub = rcu_dereference_rtnl(b->media_ptr); 229 if (!ub) { 230 err = -ENODEV; 231 goto out; 232 } 233 234 if (addr->broadcast != TIPC_REPLICAST_SUPPORT) 235 return tipc_udp_xmit(net, skb, ub, src, dst); 236 237 /* Replicast, send an skb to each configured IP address */ 238 list_for_each_entry_rcu(rcast, &ub->rcast.list, list) { 239 struct sk_buff *_skb; 240 241 _skb = pskb_copy(skb, GFP_ATOMIC); 242 if (!_skb) { 243 err = -ENOMEM; 244 goto out; 245 } 246 247 err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr); 248 if (err) 249 goto out; 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 b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT; 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 b = rcu_dereference(ub->bearer); 358 if (!b) 359 goto out; 360 361 if (b && test_bit(0, &b->up)) { 362 tipc_rcv(sock_net(sk), skb, b); 363 return 0; 364 } 365 366 if (unlikely(msg_user(hdr) == LINK_CONFIG)) { 367 err = tipc_udp_rcast_disc(b, skb); 368 if (err) 369 goto out; 370 } 371 372 out: 373 kfree_skb(skb); 374 return 0; 375 } 376 377 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) 378 { 379 int err = 0; 380 struct ip_mreqn mreqn; 381 struct sock *sk = ub->ubsock->sk; 382 383 if (ntohs(remote->proto) == ETH_P_IP) { 384 mreqn.imr_multiaddr = remote->ipv4; 385 mreqn.imr_ifindex = ub->ifindex; 386 err = ip_mc_join_group(sk, &mreqn); 387 #if IS_ENABLED(CONFIG_IPV6) 388 } else { 389 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex, 390 &remote->ipv6); 391 #endif 392 } 393 return err; 394 } 395 396 static int __tipc_nl_add_udp_addr(struct sk_buff *skb, 397 struct udp_media_addr *addr, int nla_t) 398 { 399 if (ntohs(addr->proto) == ETH_P_IP) { 400 struct sockaddr_in ip4; 401 402 memset(&ip4, 0, sizeof(ip4)); 403 ip4.sin_family = AF_INET; 404 ip4.sin_port = addr->port; 405 ip4.sin_addr.s_addr = addr->ipv4.s_addr; 406 if (nla_put(skb, nla_t, sizeof(ip4), &ip4)) 407 return -EMSGSIZE; 408 409 #if IS_ENABLED(CONFIG_IPV6) 410 } else if (ntohs(addr->proto) == ETH_P_IPV6) { 411 struct sockaddr_in6 ip6; 412 413 memset(&ip6, 0, sizeof(ip6)); 414 ip6.sin6_family = AF_INET6; 415 ip6.sin6_port = addr->port; 416 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr)); 417 if (nla_put(skb, nla_t, sizeof(ip6), &ip6)) 418 return -EMSGSIZE; 419 #endif 420 } 421 422 return 0; 423 } 424 425 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb) 426 { 427 u32 bid = cb->args[0]; 428 u32 skip_cnt = cb->args[1]; 429 u32 portid = NETLINK_CB(cb->skb).portid; 430 struct udp_replicast *rcast, *tmp; 431 struct tipc_bearer *b; 432 struct udp_bearer *ub; 433 void *hdr; 434 int err; 435 int i; 436 437 if (!bid && !skip_cnt) { 438 struct net *net = sock_net(skb->sk); 439 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1]; 440 struct nlattr **attrs; 441 char *bname; 442 443 err = tipc_nlmsg_parse(cb->nlh, &attrs); 444 if (err) 445 return err; 446 447 if (!attrs[TIPC_NLA_BEARER]) 448 return -EINVAL; 449 450 err = nla_parse_nested_deprecated(battrs, TIPC_NLA_BEARER_MAX, 451 attrs[TIPC_NLA_BEARER], 452 tipc_nl_bearer_policy, NULL); 453 if (err) 454 return err; 455 456 if (!battrs[TIPC_NLA_BEARER_NAME]) 457 return -EINVAL; 458 459 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]); 460 461 rtnl_lock(); 462 b = tipc_bearer_find(net, bname); 463 if (!b) { 464 rtnl_unlock(); 465 return -EINVAL; 466 } 467 bid = b->identity; 468 } else { 469 struct net *net = sock_net(skb->sk); 470 struct tipc_net *tn = net_generic(net, tipc_net_id); 471 472 rtnl_lock(); 473 b = rtnl_dereference(tn->bearer_list[bid]); 474 if (!b) { 475 rtnl_unlock(); 476 return -EINVAL; 477 } 478 } 479 480 ub = rcu_dereference_rtnl(b->media_ptr); 481 if (!ub) { 482 rtnl_unlock(); 483 return -EINVAL; 484 } 485 486 i = 0; 487 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 488 if (i < skip_cnt) 489 goto count; 490 491 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq, 492 &tipc_genl_family, NLM_F_MULTI, 493 TIPC_NL_BEARER_GET); 494 if (!hdr) 495 goto done; 496 497 err = __tipc_nl_add_udp_addr(skb, &rcast->addr, 498 TIPC_NLA_UDP_REMOTE); 499 if (err) { 500 genlmsg_cancel(skb, hdr); 501 goto done; 502 } 503 genlmsg_end(skb, hdr); 504 count: 505 i++; 506 } 507 done: 508 rtnl_unlock(); 509 cb->args[0] = bid; 510 cb->args[1] = i; 511 512 return skb->len; 513 } 514 515 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b) 516 { 517 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; 518 struct udp_media_addr *dst; 519 struct udp_bearer *ub; 520 struct nlattr *nest; 521 522 ub = rcu_dereference_rtnl(b->media_ptr); 523 if (!ub) 524 return -ENODEV; 525 526 nest = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_UDP_OPTS); 527 if (!nest) 528 goto msg_full; 529 530 if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL)) 531 goto msg_full; 532 533 dst = (struct udp_media_addr *)&b->bcast_addr.value; 534 if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE)) 535 goto msg_full; 536 537 if (!list_empty(&ub->rcast.list)) { 538 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP)) 539 goto msg_full; 540 } 541 542 nla_nest_end(msg->skb, nest); 543 return 0; 544 msg_full: 545 nla_nest_cancel(msg->skb, nest); 546 return -EMSGSIZE; 547 } 548 549 /** 550 * tipc_parse_udp_addr - build udp media address from netlink data 551 * @nlattr: netlink attribute containing sockaddr storage aligned address 552 * @addr: tipc media address to fill with address, port and protocol type 553 * @scope_id: IPv6 scope id pointer, not NULL indicates it's required 554 */ 555 556 static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr, 557 u32 *scope_id) 558 { 559 struct sockaddr_storage sa; 560 561 nla_memcpy(&sa, nla, sizeof(sa)); 562 if (sa.ss_family == AF_INET) { 563 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa; 564 565 addr->proto = htons(ETH_P_IP); 566 addr->port = ip4->sin_port; 567 addr->ipv4.s_addr = ip4->sin_addr.s_addr; 568 return 0; 569 570 #if IS_ENABLED(CONFIG_IPV6) 571 } else if (sa.ss_family == AF_INET6) { 572 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa; 573 574 addr->proto = htons(ETH_P_IPV6); 575 addr->port = ip6->sin6_port; 576 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr)); 577 578 /* Scope ID is only interesting for local addresses */ 579 if (scope_id) { 580 int atype; 581 582 atype = ipv6_addr_type(&ip6->sin6_addr); 583 if (__ipv6_addr_needs_scope_id(atype) && 584 !ip6->sin6_scope_id) { 585 return -EINVAL; 586 } 587 588 *scope_id = ip6->sin6_scope_id ? : 0; 589 } 590 591 return 0; 592 #endif 593 } 594 return -EADDRNOTAVAIL; 595 } 596 597 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr) 598 { 599 int err; 600 struct udp_media_addr addr = {0}; 601 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 602 struct udp_media_addr *dst; 603 604 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy, NULL)) 605 return -EINVAL; 606 607 if (!opts[TIPC_NLA_UDP_REMOTE]) 608 return -EINVAL; 609 610 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL); 611 if (err) 612 return err; 613 614 dst = (struct udp_media_addr *)&b->bcast_addr.value; 615 if (tipc_udp_is_mcast_addr(dst)) { 616 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n"); 617 return -EINVAL; 618 } 619 620 if (tipc_udp_is_known_peer(b, &addr)) 621 return 0; 622 623 return tipc_udp_rcast_add(b, &addr); 624 } 625 626 /** 627 * tipc_udp_enable - callback to create a new udp bearer instance 628 * @net: network namespace 629 * @b: pointer to generic tipc_bearer 630 * @attrs: netlink bearer configuration 631 * 632 * validate the bearer parameters and initialize the udp bearer 633 * rtnl_lock should be held 634 */ 635 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, 636 struct nlattr *attrs[]) 637 { 638 int err = -EINVAL; 639 struct udp_bearer *ub; 640 struct udp_media_addr remote = {0}; 641 struct udp_media_addr local = {0}; 642 struct udp_port_cfg udp_conf = {0}; 643 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 644 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 645 u8 node_id[NODE_ID_LEN] = {0,}; 646 int rmcast = 0; 647 648 ub = kzalloc(sizeof(*ub), GFP_ATOMIC); 649 if (!ub) 650 return -ENOMEM; 651 652 INIT_LIST_HEAD(&ub->rcast.list); 653 654 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) 655 goto err; 656 657 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attrs[TIPC_NLA_BEARER_UDP_OPTS], tipc_nl_udp_policy, NULL)) 658 goto err; 659 660 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) { 661 pr_err("Invalid UDP bearer configuration"); 662 err = -EINVAL; 663 goto err; 664 } 665 666 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local, 667 &ub->ifindex); 668 if (err) 669 goto err; 670 671 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL); 672 if (err) 673 goto err; 674 675 if (remote.proto != local.proto) { 676 err = -EINVAL; 677 goto err; 678 } 679 680 /* Checking remote ip address */ 681 rmcast = tipc_udp_is_mcast_addr(&remote); 682 683 /* Autoconfigure own node identity if needed */ 684 if (!tipc_own_id(net)) { 685 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16); 686 tipc_net_init(net, node_id, 0); 687 } 688 if (!tipc_own_id(net)) { 689 pr_warn("Failed to set node id, please configure manually\n"); 690 err = -EINVAL; 691 goto err; 692 } 693 694 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; 695 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 696 rcu_assign_pointer(b->media_ptr, ub); 697 rcu_assign_pointer(ub->bearer, b); 698 tipc_udp_media_addr_set(&b->addr, &local); 699 if (local.proto == htons(ETH_P_IP)) { 700 struct net_device *dev; 701 702 dev = __ip_dev_find(net, local.ipv4.s_addr, false); 703 if (!dev) { 704 err = -ENODEV; 705 goto err; 706 } 707 udp_conf.family = AF_INET; 708 709 /* Switch to use ANY to receive packets from group */ 710 if (rmcast) 711 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 712 else 713 udp_conf.local_ip.s_addr = local.ipv4.s_addr; 714 udp_conf.use_udp_checksums = false; 715 ub->ifindex = dev->ifindex; 716 if (tipc_mtu_bad(dev, sizeof(struct iphdr) + 717 sizeof(struct udphdr))) { 718 err = -EINVAL; 719 goto err; 720 } 721 b->mtu = b->media->mtu; 722 #if IS_ENABLED(CONFIG_IPV6) 723 } else if (local.proto == htons(ETH_P_IPV6)) { 724 udp_conf.family = AF_INET6; 725 udp_conf.use_udp6_tx_checksums = true; 726 udp_conf.use_udp6_rx_checksums = true; 727 if (rmcast) 728 udp_conf.local_ip6 = in6addr_any; 729 else 730 udp_conf.local_ip6 = local.ipv6; 731 b->mtu = 1280; 732 #endif 733 } else { 734 err = -EAFNOSUPPORT; 735 goto err; 736 } 737 udp_conf.local_udp_port = local.port; 738 err = udp_sock_create(net, &udp_conf, &ub->ubsock); 739 if (err) 740 goto err; 741 tuncfg.sk_user_data = ub; 742 tuncfg.encap_type = 1; 743 tuncfg.encap_rcv = tipc_udp_recv; 744 tuncfg.encap_destroy = NULL; 745 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg); 746 747 /** 748 * The bcast media address port is used for all peers and the ip 749 * is used if it's a multicast address. 750 */ 751 memcpy(&b->bcast_addr.value, &remote, sizeof(remote)); 752 if (rmcast) 753 err = enable_mcast(ub, &remote); 754 else 755 err = tipc_udp_rcast_add(b, &remote); 756 if (err) 757 goto err; 758 759 return 0; 760 err: 761 if (ub->ubsock) 762 udp_tunnel_sock_release(ub->ubsock); 763 kfree(ub); 764 return err; 765 } 766 767 /* cleanup_bearer - break the socket/bearer association */ 768 static void cleanup_bearer(struct work_struct *work) 769 { 770 struct udp_bearer *ub = container_of(work, struct udp_bearer, work); 771 struct udp_replicast *rcast, *tmp; 772 773 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 774 list_del_rcu(&rcast->list); 775 kfree_rcu(rcast, rcu); 776 } 777 778 if (ub->ubsock) 779 udp_tunnel_sock_release(ub->ubsock); 780 synchronize_net(); 781 kfree(ub); 782 } 783 784 /* tipc_udp_disable - detach bearer from socket */ 785 static void tipc_udp_disable(struct tipc_bearer *b) 786 { 787 struct udp_bearer *ub; 788 789 ub = rcu_dereference_rtnl(b->media_ptr); 790 if (!ub) { 791 pr_err("UDP bearer instance not found\n"); 792 return; 793 } 794 if (ub->ubsock) 795 sock_set_flag(ub->ubsock->sk, SOCK_DEAD); 796 RCU_INIT_POINTER(ub->bearer, NULL); 797 798 /* sock_release need to be done outside of rtnl lock */ 799 INIT_WORK(&ub->work, cleanup_bearer); 800 schedule_work(&ub->work); 801 } 802 803 struct tipc_media udp_media_info = { 804 .send_msg = tipc_udp_send_msg, 805 .enable_media = tipc_udp_enable, 806 .disable_media = tipc_udp_disable, 807 .addr2str = tipc_udp_addr2str, 808 .addr2msg = tipc_udp_addr2msg, 809 .msg2addr = tipc_udp_msg2addr, 810 .priority = TIPC_DEF_LINK_PRI, 811 .tolerance = TIPC_DEF_LINK_TOL, 812 .window = TIPC_DEF_LINK_WIN, 813 .mtu = TIPC_DEF_LINK_UDP_MTU, 814 .type_id = TIPC_MEDIA_TYPE_UDP, 815 .hwaddr_len = 0, 816 .name = "udp" 817 }; 818