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 = 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; 214 215 tx_error: 216 kfree_skb(skb); 217 return err; 218 } 219 220 static 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 /* Replicast, send an skb to each configured IP address */ 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; 263 out: 264 kfree_skb(skb); 265 return err; 266 } 267 268 static 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 } 287 288 static 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 } 319 320 static 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 /* tipc_udp_recv - read data from bearer socket */ 358 static 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_SKB_CB(skb)->flags = 0; 379 tipc_rcv(sock_net(sk), skb, b); 380 return 0; 381 } 382 383 if (unlikely(msg_user(hdr) == LINK_CONFIG)) { 384 err = tipc_udp_rcast_disc(b, skb); 385 if (err) 386 goto out; 387 } 388 389 out: 390 kfree_skb(skb); 391 return 0; 392 } 393 394 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) 395 { 396 int err = 0; 397 struct ip_mreqn mreqn; 398 struct sock *sk = ub->ubsock->sk; 399 400 if (ntohs(remote->proto) == ETH_P_IP) { 401 mreqn.imr_multiaddr = remote->ipv4; 402 mreqn.imr_ifindex = ub->ifindex; 403 err = ip_mc_join_group(sk, &mreqn); 404 #if IS_ENABLED(CONFIG_IPV6) 405 } else { 406 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex, 407 &remote->ipv6); 408 #endif 409 } 410 return err; 411 } 412 413 static int __tipc_nl_add_udp_addr(struct sk_buff *skb, 414 struct udp_media_addr *addr, int nla_t) 415 { 416 if (ntohs(addr->proto) == ETH_P_IP) { 417 struct sockaddr_in ip4; 418 419 memset(&ip4, 0, sizeof(ip4)); 420 ip4.sin_family = AF_INET; 421 ip4.sin_port = addr->port; 422 ip4.sin_addr.s_addr = addr->ipv4.s_addr; 423 if (nla_put(skb, nla_t, sizeof(ip4), &ip4)) 424 return -EMSGSIZE; 425 426 #if IS_ENABLED(CONFIG_IPV6) 427 } else if (ntohs(addr->proto) == ETH_P_IPV6) { 428 struct sockaddr_in6 ip6; 429 430 memset(&ip6, 0, sizeof(ip6)); 431 ip6.sin6_family = AF_INET6; 432 ip6.sin6_port = addr->port; 433 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr)); 434 if (nla_put(skb, nla_t, sizeof(ip6), &ip6)) 435 return -EMSGSIZE; 436 #endif 437 } 438 439 return 0; 440 } 441 442 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb) 443 { 444 u32 bid = cb->args[0]; 445 u32 skip_cnt = cb->args[1]; 446 u32 portid = NETLINK_CB(cb->skb).portid; 447 struct udp_replicast *rcast, *tmp; 448 struct tipc_bearer *b; 449 struct udp_bearer *ub; 450 void *hdr; 451 int err; 452 int i; 453 454 if (!bid && !skip_cnt) { 455 struct nlattr **attrs = genl_dumpit_info(cb)->attrs; 456 struct net *net = sock_net(skb->sk); 457 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1]; 458 char *bname; 459 460 if (!attrs[TIPC_NLA_BEARER]) 461 return -EINVAL; 462 463 err = nla_parse_nested_deprecated(battrs, TIPC_NLA_BEARER_MAX, 464 attrs[TIPC_NLA_BEARER], 465 tipc_nl_bearer_policy, NULL); 466 if (err) 467 return err; 468 469 if (!battrs[TIPC_NLA_BEARER_NAME]) 470 return -EINVAL; 471 472 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]); 473 474 rtnl_lock(); 475 b = tipc_bearer_find(net, bname); 476 if (!b) { 477 rtnl_unlock(); 478 return -EINVAL; 479 } 480 bid = b->identity; 481 } else { 482 struct net *net = sock_net(skb->sk); 483 struct tipc_net *tn = net_generic(net, tipc_net_id); 484 485 rtnl_lock(); 486 b = rtnl_dereference(tn->bearer_list[bid]); 487 if (!b) { 488 rtnl_unlock(); 489 return -EINVAL; 490 } 491 } 492 493 ub = rtnl_dereference(b->media_ptr); 494 if (!ub) { 495 rtnl_unlock(); 496 return -EINVAL; 497 } 498 499 i = 0; 500 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 501 if (i < skip_cnt) 502 goto count; 503 504 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq, 505 &tipc_genl_family, NLM_F_MULTI, 506 TIPC_NL_BEARER_GET); 507 if (!hdr) 508 goto done; 509 510 err = __tipc_nl_add_udp_addr(skb, &rcast->addr, 511 TIPC_NLA_UDP_REMOTE); 512 if (err) { 513 genlmsg_cancel(skb, hdr); 514 goto done; 515 } 516 genlmsg_end(skb, hdr); 517 count: 518 i++; 519 } 520 done: 521 rtnl_unlock(); 522 cb->args[0] = bid; 523 cb->args[1] = i; 524 525 return skb->len; 526 } 527 528 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b) 529 { 530 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; 531 struct udp_media_addr *dst; 532 struct udp_bearer *ub; 533 struct nlattr *nest; 534 535 ub = rtnl_dereference(b->media_ptr); 536 if (!ub) 537 return -ENODEV; 538 539 nest = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_UDP_OPTS); 540 if (!nest) 541 goto msg_full; 542 543 if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL)) 544 goto msg_full; 545 546 dst = (struct udp_media_addr *)&b->bcast_addr.value; 547 if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE)) 548 goto msg_full; 549 550 if (!list_empty(&ub->rcast.list)) { 551 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP)) 552 goto msg_full; 553 } 554 555 nla_nest_end(msg->skb, nest); 556 return 0; 557 msg_full: 558 nla_nest_cancel(msg->skb, nest); 559 return -EMSGSIZE; 560 } 561 562 /** 563 * tipc_parse_udp_addr - build udp media address from netlink data 564 * @nlattr: netlink attribute containing sockaddr storage aligned address 565 * @addr: tipc media address to fill with address, port and protocol type 566 * @scope_id: IPv6 scope id pointer, not NULL indicates it's required 567 */ 568 569 static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr, 570 u32 *scope_id) 571 { 572 struct sockaddr_storage sa; 573 574 nla_memcpy(&sa, nla, sizeof(sa)); 575 if (sa.ss_family == AF_INET) { 576 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa; 577 578 addr->proto = htons(ETH_P_IP); 579 addr->port = ip4->sin_port; 580 addr->ipv4.s_addr = ip4->sin_addr.s_addr; 581 return 0; 582 583 #if IS_ENABLED(CONFIG_IPV6) 584 } else if (sa.ss_family == AF_INET6) { 585 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa; 586 587 addr->proto = htons(ETH_P_IPV6); 588 addr->port = ip6->sin6_port; 589 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr)); 590 591 /* Scope ID is only interesting for local addresses */ 592 if (scope_id) { 593 int atype; 594 595 atype = ipv6_addr_type(&ip6->sin6_addr); 596 if (__ipv6_addr_needs_scope_id(atype) && 597 !ip6->sin6_scope_id) { 598 return -EINVAL; 599 } 600 601 *scope_id = ip6->sin6_scope_id ? : 0; 602 } 603 604 return 0; 605 #endif 606 } 607 return -EADDRNOTAVAIL; 608 } 609 610 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr) 611 { 612 int err; 613 struct udp_media_addr addr = {0}; 614 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 615 struct udp_media_addr *dst; 616 617 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attr, tipc_nl_udp_policy, NULL)) 618 return -EINVAL; 619 620 if (!opts[TIPC_NLA_UDP_REMOTE]) 621 return -EINVAL; 622 623 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL); 624 if (err) 625 return err; 626 627 dst = (struct udp_media_addr *)&b->bcast_addr.value; 628 if (tipc_udp_is_mcast_addr(dst)) { 629 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n"); 630 return -EINVAL; 631 } 632 633 if (tipc_udp_is_known_peer(b, &addr)) 634 return 0; 635 636 return tipc_udp_rcast_add(b, &addr); 637 } 638 639 /** 640 * tipc_udp_enable - callback to create a new udp bearer instance 641 * @net: network namespace 642 * @b: pointer to generic tipc_bearer 643 * @attrs: netlink bearer configuration 644 * 645 * validate the bearer parameters and initialize the udp bearer 646 * rtnl_lock should be held 647 */ 648 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, 649 struct nlattr *attrs[]) 650 { 651 int err = -EINVAL; 652 struct udp_bearer *ub; 653 struct udp_media_addr remote = {0}; 654 struct udp_media_addr local = {0}; 655 struct udp_port_cfg udp_conf = {0}; 656 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 657 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 658 u8 node_id[NODE_ID_LEN] = {0,}; 659 int rmcast = 0; 660 661 ub = kzalloc(sizeof(*ub), GFP_ATOMIC); 662 if (!ub) 663 return -ENOMEM; 664 665 INIT_LIST_HEAD(&ub->rcast.list); 666 667 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) 668 goto err; 669 670 if (nla_parse_nested_deprecated(opts, TIPC_NLA_UDP_MAX, attrs[TIPC_NLA_BEARER_UDP_OPTS], tipc_nl_udp_policy, NULL)) 671 goto err; 672 673 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) { 674 pr_err("Invalid UDP bearer configuration"); 675 err = -EINVAL; 676 goto err; 677 } 678 679 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local, 680 &ub->ifindex); 681 if (err) 682 goto err; 683 684 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL); 685 if (err) 686 goto err; 687 688 if (remote.proto != local.proto) { 689 err = -EINVAL; 690 goto err; 691 } 692 693 /* Checking remote ip address */ 694 rmcast = tipc_udp_is_mcast_addr(&remote); 695 696 /* Autoconfigure own node identity if needed */ 697 if (!tipc_own_id(net)) { 698 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16); 699 tipc_net_init(net, node_id, 0); 700 } 701 if (!tipc_own_id(net)) { 702 pr_warn("Failed to set node id, please configure manually\n"); 703 err = -EINVAL; 704 goto err; 705 } 706 707 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; 708 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 709 rcu_assign_pointer(b->media_ptr, ub); 710 rcu_assign_pointer(ub->bearer, b); 711 tipc_udp_media_addr_set(&b->addr, &local); 712 if (local.proto == htons(ETH_P_IP)) { 713 struct net_device *dev; 714 715 dev = __ip_dev_find(net, local.ipv4.s_addr, false); 716 if (!dev) { 717 err = -ENODEV; 718 goto err; 719 } 720 udp_conf.family = AF_INET; 721 722 /* Switch to use ANY to receive packets from group */ 723 if (rmcast) 724 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 725 else 726 udp_conf.local_ip.s_addr = local.ipv4.s_addr; 727 udp_conf.use_udp_checksums = false; 728 ub->ifindex = dev->ifindex; 729 if (tipc_mtu_bad(dev, sizeof(struct iphdr) + 730 sizeof(struct udphdr))) { 731 err = -EINVAL; 732 goto err; 733 } 734 b->mtu = b->media->mtu; 735 #if IS_ENABLED(CONFIG_IPV6) 736 } else if (local.proto == htons(ETH_P_IPV6)) { 737 udp_conf.family = AF_INET6; 738 udp_conf.use_udp6_tx_checksums = true; 739 udp_conf.use_udp6_rx_checksums = true; 740 if (rmcast) 741 udp_conf.local_ip6 = in6addr_any; 742 else 743 udp_conf.local_ip6 = local.ipv6; 744 b->mtu = 1280; 745 #endif 746 } else { 747 err = -EAFNOSUPPORT; 748 goto err; 749 } 750 udp_conf.local_udp_port = local.port; 751 err = udp_sock_create(net, &udp_conf, &ub->ubsock); 752 if (err) 753 goto err; 754 tuncfg.sk_user_data = ub; 755 tuncfg.encap_type = 1; 756 tuncfg.encap_rcv = tipc_udp_recv; 757 tuncfg.encap_destroy = NULL; 758 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg); 759 760 err = dst_cache_init(&ub->rcast.dst_cache, GFP_ATOMIC); 761 if (err) 762 goto free; 763 764 /** 765 * The bcast media address port is used for all peers and the ip 766 * is used if it's a multicast address. 767 */ 768 memcpy(&b->bcast_addr.value, &remote, sizeof(remote)); 769 if (rmcast) 770 err = enable_mcast(ub, &remote); 771 else 772 err = tipc_udp_rcast_add(b, &remote); 773 if (err) 774 goto free; 775 776 return 0; 777 778 free: 779 dst_cache_destroy(&ub->rcast.dst_cache); 780 udp_tunnel_sock_release(ub->ubsock); 781 err: 782 kfree(ub); 783 return err; 784 } 785 786 /* cleanup_bearer - break the socket/bearer association */ 787 static void cleanup_bearer(struct work_struct *work) 788 { 789 struct udp_bearer *ub = container_of(work, struct udp_bearer, work); 790 struct udp_replicast *rcast, *tmp; 791 792 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 793 dst_cache_destroy(&rcast->dst_cache); 794 list_del_rcu(&rcast->list); 795 kfree_rcu(rcast, rcu); 796 } 797 798 dst_cache_destroy(&ub->rcast.dst_cache); 799 udp_tunnel_sock_release(ub->ubsock); 800 synchronize_net(); 801 kfree(ub); 802 } 803 804 /* tipc_udp_disable - detach bearer from socket */ 805 static void tipc_udp_disable(struct tipc_bearer *b) 806 { 807 struct udp_bearer *ub; 808 809 ub = rtnl_dereference(b->media_ptr); 810 if (!ub) { 811 pr_err("UDP bearer instance not found\n"); 812 return; 813 } 814 sock_set_flag(ub->ubsock->sk, SOCK_DEAD); 815 RCU_INIT_POINTER(ub->bearer, NULL); 816 817 /* sock_release need to be done outside of rtnl lock */ 818 INIT_WORK(&ub->work, cleanup_bearer); 819 schedule_work(&ub->work); 820 } 821 822 struct tipc_media udp_media_info = { 823 .send_msg = tipc_udp_send_msg, 824 .enable_media = tipc_udp_enable, 825 .disable_media = tipc_udp_disable, 826 .addr2str = tipc_udp_addr2str, 827 .addr2msg = tipc_udp_addr2msg, 828 .msg2addr = tipc_udp_msg2addr, 829 .priority = TIPC_DEF_LINK_PRI, 830 .tolerance = TIPC_DEF_LINK_TOL, 831 .min_win = TIPC_DEF_LINK_WIN, 832 .max_win = TIPC_DEF_LINK_WIN, 833 .mtu = TIPC_DEF_LINK_UDP_MTU, 834 .type_id = TIPC_MEDIA_TYPE_UDP, 835 .hwaddr_len = 0, 836 .name = "udp" 837 }; 838