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 "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 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 rcu_out: 375 rcu_read_unlock(); 376 out: 377 kfree_skb(skb); 378 return 0; 379 } 380 381 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) 382 { 383 int err = 0; 384 struct ip_mreqn mreqn; 385 struct sock *sk = ub->ubsock->sk; 386 387 if (ntohs(remote->proto) == ETH_P_IP) { 388 mreqn.imr_multiaddr = remote->ipv4; 389 mreqn.imr_ifindex = ub->ifindex; 390 err = ip_mc_join_group(sk, &mreqn); 391 #if IS_ENABLED(CONFIG_IPV6) 392 } else { 393 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex, 394 &remote->ipv6); 395 #endif 396 } 397 return err; 398 } 399 400 static int __tipc_nl_add_udp_addr(struct sk_buff *skb, 401 struct udp_media_addr *addr, int nla_t) 402 { 403 if (ntohs(addr->proto) == ETH_P_IP) { 404 struct sockaddr_in ip4; 405 406 memset(&ip4, 0, sizeof(ip4)); 407 ip4.sin_family = AF_INET; 408 ip4.sin_port = addr->port; 409 ip4.sin_addr.s_addr = addr->ipv4.s_addr; 410 if (nla_put(skb, nla_t, sizeof(ip4), &ip4)) 411 return -EMSGSIZE; 412 413 #if IS_ENABLED(CONFIG_IPV6) 414 } else if (ntohs(addr->proto) == ETH_P_IPV6) { 415 struct sockaddr_in6 ip6; 416 417 memset(&ip6, 0, sizeof(ip6)); 418 ip6.sin6_family = AF_INET6; 419 ip6.sin6_port = addr->port; 420 memcpy(&ip6.sin6_addr, &addr->ipv6, sizeof(struct in6_addr)); 421 if (nla_put(skb, nla_t, sizeof(ip6), &ip6)) 422 return -EMSGSIZE; 423 #endif 424 } 425 426 return 0; 427 } 428 429 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb) 430 { 431 u32 bid = cb->args[0]; 432 u32 skip_cnt = cb->args[1]; 433 u32 portid = NETLINK_CB(cb->skb).portid; 434 struct udp_replicast *rcast, *tmp; 435 struct tipc_bearer *b; 436 struct udp_bearer *ub; 437 void *hdr; 438 int err; 439 int i; 440 441 if (!bid && !skip_cnt) { 442 struct net *net = sock_net(skb->sk); 443 struct nlattr *battrs[TIPC_NLA_BEARER_MAX + 1]; 444 struct nlattr **attrs; 445 char *bname; 446 447 err = tipc_nlmsg_parse(cb->nlh, &attrs); 448 if (err) 449 return err; 450 451 if (!attrs[TIPC_NLA_BEARER]) 452 return -EINVAL; 453 454 err = nla_parse_nested(battrs, TIPC_NLA_BEARER_MAX, 455 attrs[TIPC_NLA_BEARER], 456 tipc_nl_bearer_policy, NULL); 457 if (err) 458 return err; 459 460 if (!battrs[TIPC_NLA_BEARER_NAME]) 461 return -EINVAL; 462 463 bname = nla_data(battrs[TIPC_NLA_BEARER_NAME]); 464 465 rtnl_lock(); 466 b = tipc_bearer_find(net, bname); 467 if (!b) { 468 rtnl_unlock(); 469 return -EINVAL; 470 } 471 bid = b->identity; 472 } else { 473 struct net *net = sock_net(skb->sk); 474 struct tipc_net *tn = net_generic(net, tipc_net_id); 475 476 rtnl_lock(); 477 b = rtnl_dereference(tn->bearer_list[bid]); 478 if (!b) { 479 rtnl_unlock(); 480 return -EINVAL; 481 } 482 } 483 484 ub = rcu_dereference_rtnl(b->media_ptr); 485 if (!ub) { 486 rtnl_unlock(); 487 return -EINVAL; 488 } 489 490 i = 0; 491 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 492 if (i < skip_cnt) 493 goto count; 494 495 hdr = genlmsg_put(skb, portid, cb->nlh->nlmsg_seq, 496 &tipc_genl_family, NLM_F_MULTI, 497 TIPC_NL_BEARER_GET); 498 if (!hdr) 499 goto done; 500 501 err = __tipc_nl_add_udp_addr(skb, &rcast->addr, 502 TIPC_NLA_UDP_REMOTE); 503 if (err) { 504 genlmsg_cancel(skb, hdr); 505 goto done; 506 } 507 genlmsg_end(skb, hdr); 508 count: 509 i++; 510 } 511 done: 512 rtnl_unlock(); 513 cb->args[0] = bid; 514 cb->args[1] = i; 515 516 return skb->len; 517 } 518 519 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b) 520 { 521 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value; 522 struct udp_media_addr *dst; 523 struct udp_bearer *ub; 524 struct nlattr *nest; 525 526 ub = rcu_dereference_rtnl(b->media_ptr); 527 if (!ub) 528 return -ENODEV; 529 530 nest = nla_nest_start(msg->skb, TIPC_NLA_BEARER_UDP_OPTS); 531 if (!nest) 532 goto msg_full; 533 534 if (__tipc_nl_add_udp_addr(msg->skb, src, TIPC_NLA_UDP_LOCAL)) 535 goto msg_full; 536 537 dst = (struct udp_media_addr *)&b->bcast_addr.value; 538 if (__tipc_nl_add_udp_addr(msg->skb, dst, TIPC_NLA_UDP_REMOTE)) 539 goto msg_full; 540 541 if (!list_empty(&ub->rcast.list)) { 542 if (nla_put_flag(msg->skb, TIPC_NLA_UDP_MULTI_REMOTEIP)) 543 goto msg_full; 544 } 545 546 nla_nest_end(msg->skb, nest); 547 return 0; 548 msg_full: 549 nla_nest_cancel(msg->skb, nest); 550 return -EMSGSIZE; 551 } 552 553 /** 554 * tipc_parse_udp_addr - build udp media address from netlink data 555 * @nlattr: netlink attribute containing sockaddr storage aligned address 556 * @addr: tipc media address to fill with address, port and protocol type 557 * @scope_id: IPv6 scope id pointer, not NULL indicates it's required 558 */ 559 560 static int tipc_parse_udp_addr(struct nlattr *nla, struct udp_media_addr *addr, 561 u32 *scope_id) 562 { 563 struct sockaddr_storage sa; 564 565 nla_memcpy(&sa, nla, sizeof(sa)); 566 if (sa.ss_family == AF_INET) { 567 struct sockaddr_in *ip4 = (struct sockaddr_in *)&sa; 568 569 addr->proto = htons(ETH_P_IP); 570 addr->port = ip4->sin_port; 571 addr->ipv4.s_addr = ip4->sin_addr.s_addr; 572 return 0; 573 574 #if IS_ENABLED(CONFIG_IPV6) 575 } else if (sa.ss_family == AF_INET6) { 576 struct sockaddr_in6 *ip6 = (struct sockaddr_in6 *)&sa; 577 578 addr->proto = htons(ETH_P_IPV6); 579 addr->port = ip6->sin6_port; 580 memcpy(&addr->ipv6, &ip6->sin6_addr, sizeof(struct in6_addr)); 581 582 /* Scope ID is only interesting for local addresses */ 583 if (scope_id) { 584 int atype; 585 586 atype = ipv6_addr_type(&ip6->sin6_addr); 587 if (__ipv6_addr_needs_scope_id(atype) && 588 !ip6->sin6_scope_id) { 589 return -EINVAL; 590 } 591 592 *scope_id = ip6->sin6_scope_id ? : 0; 593 } 594 595 return 0; 596 #endif 597 } 598 return -EADDRNOTAVAIL; 599 } 600 601 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr) 602 { 603 int err; 604 struct udp_media_addr addr = {0}; 605 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 606 struct udp_media_addr *dst; 607 608 if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, attr, 609 tipc_nl_udp_policy, NULL)) 610 return -EINVAL; 611 612 if (!opts[TIPC_NLA_UDP_REMOTE]) 613 return -EINVAL; 614 615 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL); 616 if (err) 617 return err; 618 619 dst = (struct udp_media_addr *)&b->bcast_addr.value; 620 if (tipc_udp_is_mcast_addr(dst)) { 621 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n"); 622 return -EINVAL; 623 } 624 625 if (tipc_udp_is_known_peer(b, &addr)) 626 return 0; 627 628 return tipc_udp_rcast_add(b, &addr); 629 } 630 631 /** 632 * tipc_udp_enable - callback to create a new udp bearer instance 633 * @net: network namespace 634 * @b: pointer to generic tipc_bearer 635 * @attrs: netlink bearer configuration 636 * 637 * validate the bearer parameters and initialize the udp bearer 638 * rtnl_lock should be held 639 */ 640 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, 641 struct nlattr *attrs[]) 642 { 643 int err = -EINVAL; 644 struct udp_bearer *ub; 645 struct udp_media_addr remote = {0}; 646 struct udp_media_addr local = {0}; 647 struct udp_port_cfg udp_conf = {0}; 648 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 649 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 650 u8 node_id[NODE_ID_LEN] = {0,}; 651 int rmcast = 0; 652 653 ub = kzalloc(sizeof(*ub), GFP_ATOMIC); 654 if (!ub) 655 return -ENOMEM; 656 657 INIT_LIST_HEAD(&ub->rcast.list); 658 659 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) 660 goto err; 661 662 if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, 663 attrs[TIPC_NLA_BEARER_UDP_OPTS], 664 tipc_nl_udp_policy, NULL)) 665 goto err; 666 667 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) { 668 pr_err("Invalid UDP bearer configuration"); 669 err = -EINVAL; 670 goto err; 671 } 672 673 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local, 674 &ub->ifindex); 675 if (err) 676 goto err; 677 678 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL); 679 if (err) 680 goto err; 681 682 if (remote.proto != local.proto) { 683 err = -EINVAL; 684 goto err; 685 } 686 687 /* Checking remote ip address */ 688 rmcast = tipc_udp_is_mcast_addr(&remote); 689 690 /* Autoconfigure own node identity if needed */ 691 if (!tipc_own_id(net)) { 692 memcpy(node_id, local.ipv6.in6_u.u6_addr8, 16); 693 tipc_net_init(net, node_id, 0); 694 } 695 if (!tipc_own_id(net)) { 696 pr_warn("Failed to set node id, please configure manually\n"); 697 err = -EINVAL; 698 goto err; 699 } 700 701 b->bcast_addr.media_id = TIPC_MEDIA_TYPE_UDP; 702 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT; 703 rcu_assign_pointer(b->media_ptr, ub); 704 rcu_assign_pointer(ub->bearer, b); 705 tipc_udp_media_addr_set(&b->addr, &local); 706 if (local.proto == htons(ETH_P_IP)) { 707 struct net_device *dev; 708 709 dev = __ip_dev_find(net, local.ipv4.s_addr, false); 710 if (!dev) { 711 err = -ENODEV; 712 goto err; 713 } 714 udp_conf.family = AF_INET; 715 716 /* Switch to use ANY to receive packets from group */ 717 if (rmcast) 718 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 719 else 720 udp_conf.local_ip.s_addr = local.ipv4.s_addr; 721 udp_conf.use_udp_checksums = false; 722 ub->ifindex = dev->ifindex; 723 if (tipc_mtu_bad(dev, sizeof(struct iphdr) + 724 sizeof(struct udphdr))) { 725 err = -EINVAL; 726 goto err; 727 } 728 b->mtu = b->media->mtu; 729 #if IS_ENABLED(CONFIG_IPV6) 730 } else if (local.proto == htons(ETH_P_IPV6)) { 731 udp_conf.family = AF_INET6; 732 udp_conf.use_udp6_tx_checksums = true; 733 udp_conf.use_udp6_rx_checksums = true; 734 if (rmcast) 735 udp_conf.local_ip6 = in6addr_any; 736 else 737 udp_conf.local_ip6 = local.ipv6; 738 b->mtu = 1280; 739 #endif 740 } else { 741 err = -EAFNOSUPPORT; 742 goto err; 743 } 744 udp_conf.local_udp_port = local.port; 745 err = udp_sock_create(net, &udp_conf, &ub->ubsock); 746 if (err) 747 goto err; 748 tuncfg.sk_user_data = ub; 749 tuncfg.encap_type = 1; 750 tuncfg.encap_rcv = tipc_udp_recv; 751 tuncfg.encap_destroy = NULL; 752 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg); 753 754 /** 755 * The bcast media address port is used for all peers and the ip 756 * is used if it's a multicast address. 757 */ 758 memcpy(&b->bcast_addr.value, &remote, sizeof(remote)); 759 if (rmcast) 760 err = enable_mcast(ub, &remote); 761 else 762 err = tipc_udp_rcast_add(b, &remote); 763 if (err) 764 goto err; 765 766 return 0; 767 err: 768 if (ub->ubsock) 769 udp_tunnel_sock_release(ub->ubsock); 770 kfree(ub); 771 return err; 772 } 773 774 /* cleanup_bearer - break the socket/bearer association */ 775 static void cleanup_bearer(struct work_struct *work) 776 { 777 struct udp_bearer *ub = container_of(work, struct udp_bearer, work); 778 struct udp_replicast *rcast, *tmp; 779 780 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 781 list_del_rcu(&rcast->list); 782 kfree_rcu(rcast, rcu); 783 } 784 785 if (ub->ubsock) 786 udp_tunnel_sock_release(ub->ubsock); 787 synchronize_net(); 788 kfree(ub); 789 } 790 791 /* tipc_udp_disable - detach bearer from socket */ 792 static void tipc_udp_disable(struct tipc_bearer *b) 793 { 794 struct udp_bearer *ub; 795 796 ub = rcu_dereference_rtnl(b->media_ptr); 797 if (!ub) { 798 pr_err("UDP bearer instance not found\n"); 799 return; 800 } 801 if (ub->ubsock) 802 sock_set_flag(ub->ubsock->sk, SOCK_DEAD); 803 RCU_INIT_POINTER(ub->bearer, NULL); 804 805 /* sock_release need to be done outside of rtnl lock */ 806 INIT_WORK(&ub->work, cleanup_bearer); 807 schedule_work(&ub->work); 808 } 809 810 struct tipc_media udp_media_info = { 811 .send_msg = tipc_udp_send_msg, 812 .enable_media = tipc_udp_enable, 813 .disable_media = tipc_udp_disable, 814 .addr2str = tipc_udp_addr2str, 815 .addr2msg = tipc_udp_addr2msg, 816 .msg2addr = tipc_udp_msg2addr, 817 .priority = TIPC_DEF_LINK_PRI, 818 .tolerance = TIPC_DEF_LINK_TOL, 819 .window = TIPC_DEF_LINK_WIN, 820 .mtu = TIPC_DEF_LINK_UDP_MTU, 821 .type_id = TIPC_MEDIA_TYPE_UDP, 822 .hwaddr_len = 0, 823 .name = "udp" 824 }; 825