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 kfree_skb(_skb); 250 goto out; 251 } 252 } 253 err = 0; 254 out: 255 kfree_skb(skb); 256 return err; 257 } 258 259 static bool tipc_udp_is_known_peer(struct tipc_bearer *b, 260 struct udp_media_addr *addr) 261 { 262 struct udp_replicast *rcast, *tmp; 263 struct udp_bearer *ub; 264 265 ub = rcu_dereference_rtnl(b->media_ptr); 266 if (!ub) { 267 pr_err_ratelimited("UDP bearer instance not found\n"); 268 return false; 269 } 270 271 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 272 if (!memcmp(&rcast->addr, addr, sizeof(struct udp_media_addr))) 273 return true; 274 } 275 276 return false; 277 } 278 279 static int tipc_udp_rcast_add(struct tipc_bearer *b, 280 struct udp_media_addr *addr) 281 { 282 struct udp_replicast *rcast; 283 struct udp_bearer *ub; 284 285 ub = rcu_dereference_rtnl(b->media_ptr); 286 if (!ub) 287 return -ENODEV; 288 289 rcast = kmalloc(sizeof(*rcast), GFP_ATOMIC); 290 if (!rcast) 291 return -ENOMEM; 292 293 memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr)); 294 295 if (ntohs(addr->proto) == ETH_P_IP) 296 pr_info("New replicast peer: %pI4\n", &rcast->addr.ipv4); 297 #if IS_ENABLED(CONFIG_IPV6) 298 else if (ntohs(addr->proto) == ETH_P_IPV6) 299 pr_info("New replicast peer: %pI6\n", &rcast->addr.ipv6); 300 #endif 301 b->bcast_addr.broadcast = TIPC_REPLICAST_SUPPORT; 302 list_add_rcu(&rcast->list, &ub->rcast.list); 303 return 0; 304 } 305 306 static int tipc_udp_rcast_disc(struct tipc_bearer *b, struct sk_buff *skb) 307 { 308 struct udp_media_addr src = {0}; 309 struct udp_media_addr *dst; 310 311 dst = (struct udp_media_addr *)&b->bcast_addr.value; 312 if (tipc_udp_is_mcast_addr(dst)) 313 return 0; 314 315 src.port = udp_hdr(skb)->source; 316 317 if (ip_hdr(skb)->version == 4) { 318 struct iphdr *iphdr = ip_hdr(skb); 319 320 src.proto = htons(ETH_P_IP); 321 src.ipv4.s_addr = iphdr->saddr; 322 if (ipv4_is_multicast(iphdr->daddr)) 323 return 0; 324 #if IS_ENABLED(CONFIG_IPV6) 325 } else if (ip_hdr(skb)->version == 6) { 326 struct ipv6hdr *iphdr = ipv6_hdr(skb); 327 328 src.proto = htons(ETH_P_IPV6); 329 src.ipv6 = iphdr->saddr; 330 if (ipv6_addr_is_multicast(&iphdr->daddr)) 331 return 0; 332 #endif 333 } else { 334 return 0; 335 } 336 337 if (likely(tipc_udp_is_known_peer(b, &src))) 338 return 0; 339 340 return tipc_udp_rcast_add(b, &src); 341 } 342 343 /* tipc_udp_recv - read data from bearer socket */ 344 static int tipc_udp_recv(struct sock *sk, struct sk_buff *skb) 345 { 346 struct udp_bearer *ub; 347 struct tipc_bearer *b; 348 struct tipc_msg *hdr; 349 int err; 350 351 ub = rcu_dereference_sk_user_data(sk); 352 if (!ub) { 353 pr_err_ratelimited("Failed to get UDP bearer reference"); 354 goto out; 355 } 356 skb_pull(skb, sizeof(struct udphdr)); 357 hdr = buf_msg(skb); 358 359 rcu_read_lock(); 360 b = rcu_dereference_rtnl(ub->bearer); 361 if (!b) 362 goto rcu_out; 363 364 if (b && test_bit(0, &b->up)) { 365 tipc_rcv(sock_net(sk), skb, b); 366 rcu_read_unlock(); 367 return 0; 368 } 369 370 if (unlikely(msg_user(hdr) == LINK_CONFIG)) { 371 err = tipc_udp_rcast_disc(b, skb); 372 if (err) 373 goto rcu_out; 374 } 375 376 rcu_out: 377 rcu_read_unlock(); 378 out: 379 kfree_skb(skb); 380 return 0; 381 } 382 383 static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote) 384 { 385 int err = 0; 386 struct ip_mreqn mreqn; 387 struct sock *sk = ub->ubsock->sk; 388 389 if (ntohs(remote->proto) == ETH_P_IP) { 390 mreqn.imr_multiaddr = remote->ipv4; 391 mreqn.imr_ifindex = ub->ifindex; 392 err = ip_mc_join_group(sk, &mreqn); 393 #if IS_ENABLED(CONFIG_IPV6) 394 } else { 395 err = ipv6_stub->ipv6_sock_mc_join(sk, ub->ifindex, 396 &remote->ipv6); 397 #endif 398 } 399 return err; 400 } 401 402 static int __tipc_nl_add_udp_addr(struct sk_buff *skb, 403 struct udp_media_addr *addr, int nla_t) 404 { 405 if (ntohs(addr->proto) == ETH_P_IP) { 406 struct sockaddr_in ip4; 407 408 memset(&ip4, 0, sizeof(ip4)); 409 ip4.sin_family = AF_INET; 410 ip4.sin_port = addr->port; 411 ip4.sin_addr.s_addr = addr->ipv4.s_addr; 412 if (nla_put(skb, nla_t, sizeof(ip4), &ip4)) 413 return -EMSGSIZE; 414 415 #if IS_ENABLED(CONFIG_IPV6) 416 } else if (ntohs(addr->proto) == ETH_P_IPV6) { 417 struct sockaddr_in6 ip6; 418 419 memset(&ip6, 0, sizeof(ip6)); 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, NULL); 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, 611 tipc_nl_udp_policy, NULL)) 612 return -EINVAL; 613 614 if (!opts[TIPC_NLA_UDP_REMOTE]) 615 return -EINVAL; 616 617 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &addr, NULL); 618 if (err) 619 return err; 620 621 dst = (struct udp_media_addr *)&b->bcast_addr.value; 622 if (tipc_udp_is_mcast_addr(dst)) { 623 pr_err("Can't add remote ip to TIPC UDP multicast bearer\n"); 624 return -EINVAL; 625 } 626 627 if (tipc_udp_is_known_peer(b, &addr)) 628 return 0; 629 630 return tipc_udp_rcast_add(b, &addr); 631 } 632 633 /** 634 * tipc_udp_enable - callback to create a new udp bearer instance 635 * @net: network namespace 636 * @b: pointer to generic tipc_bearer 637 * @attrs: netlink bearer configuration 638 * 639 * validate the bearer parameters and initialize the udp bearer 640 * rtnl_lock should be held 641 */ 642 static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, 643 struct nlattr *attrs[]) 644 { 645 int err = -EINVAL; 646 struct udp_bearer *ub; 647 struct udp_media_addr remote = {0}; 648 struct udp_media_addr local = {0}; 649 struct udp_port_cfg udp_conf = {0}; 650 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 651 struct nlattr *opts[TIPC_NLA_UDP_MAX + 1]; 652 u8 node_id[NODE_ID_LEN] = {0,}; 653 654 ub = kzalloc(sizeof(*ub), GFP_ATOMIC); 655 if (!ub) 656 return -ENOMEM; 657 658 INIT_LIST_HEAD(&ub->rcast.list); 659 660 if (!attrs[TIPC_NLA_BEARER_UDP_OPTS]) 661 goto err; 662 663 if (nla_parse_nested(opts, TIPC_NLA_UDP_MAX, 664 attrs[TIPC_NLA_BEARER_UDP_OPTS], 665 tipc_nl_udp_policy, NULL)) 666 goto err; 667 668 if (!opts[TIPC_NLA_UDP_LOCAL] || !opts[TIPC_NLA_UDP_REMOTE]) { 669 pr_err("Invalid UDP bearer configuration"); 670 err = -EINVAL; 671 goto err; 672 } 673 674 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_LOCAL], &local, 675 &ub->ifindex); 676 if (err) 677 goto err; 678 679 err = tipc_parse_udp_addr(opts[TIPC_NLA_UDP_REMOTE], &remote, NULL); 680 if (err) 681 goto err; 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 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 709 udp_conf.use_udp_checksums = false; 710 ub->ifindex = dev->ifindex; 711 if (tipc_mtu_bad(dev, sizeof(struct iphdr) + 712 sizeof(struct udphdr))) { 713 err = -EINVAL; 714 goto err; 715 } 716 b->mtu = b->media->mtu; 717 #if IS_ENABLED(CONFIG_IPV6) 718 } else if (local.proto == htons(ETH_P_IPV6)) { 719 udp_conf.family = AF_INET6; 720 udp_conf.use_udp6_tx_checksums = true; 721 udp_conf.use_udp6_rx_checksums = true; 722 udp_conf.local_ip6 = in6addr_any; 723 b->mtu = 1280; 724 #endif 725 } else { 726 err = -EAFNOSUPPORT; 727 goto err; 728 } 729 udp_conf.local_udp_port = local.port; 730 err = udp_sock_create(net, &udp_conf, &ub->ubsock); 731 if (err) 732 goto err; 733 tuncfg.sk_user_data = ub; 734 tuncfg.encap_type = 1; 735 tuncfg.encap_rcv = tipc_udp_recv; 736 tuncfg.encap_destroy = NULL; 737 setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg); 738 739 /** 740 * The bcast media address port is used for all peers and the ip 741 * is used if it's a multicast address. 742 */ 743 memcpy(&b->bcast_addr.value, &remote, sizeof(remote)); 744 if (tipc_udp_is_mcast_addr(&remote)) 745 err = enable_mcast(ub, &remote); 746 else 747 err = tipc_udp_rcast_add(b, &remote); 748 if (err) 749 goto err; 750 751 return 0; 752 err: 753 if (ub->ubsock) 754 udp_tunnel_sock_release(ub->ubsock); 755 kfree(ub); 756 return err; 757 } 758 759 /* cleanup_bearer - break the socket/bearer association */ 760 static void cleanup_bearer(struct work_struct *work) 761 { 762 struct udp_bearer *ub = container_of(work, struct udp_bearer, work); 763 struct udp_replicast *rcast, *tmp; 764 765 list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) { 766 list_del_rcu(&rcast->list); 767 kfree_rcu(rcast, rcu); 768 } 769 770 if (ub->ubsock) 771 udp_tunnel_sock_release(ub->ubsock); 772 synchronize_net(); 773 kfree(ub); 774 } 775 776 /* tipc_udp_disable - detach bearer from socket */ 777 static void tipc_udp_disable(struct tipc_bearer *b) 778 { 779 struct udp_bearer *ub; 780 781 ub = rcu_dereference_rtnl(b->media_ptr); 782 if (!ub) { 783 pr_err("UDP bearer instance not found\n"); 784 return; 785 } 786 if (ub->ubsock) 787 sock_set_flag(ub->ubsock->sk, SOCK_DEAD); 788 RCU_INIT_POINTER(ub->bearer, NULL); 789 790 /* sock_release need to be done outside of rtnl lock */ 791 INIT_WORK(&ub->work, cleanup_bearer); 792 schedule_work(&ub->work); 793 } 794 795 struct tipc_media udp_media_info = { 796 .send_msg = tipc_udp_send_msg, 797 .enable_media = tipc_udp_enable, 798 .disable_media = tipc_udp_disable, 799 .addr2str = tipc_udp_addr2str, 800 .addr2msg = tipc_udp_addr2msg, 801 .msg2addr = tipc_udp_msg2addr, 802 .priority = TIPC_DEF_LINK_PRI, 803 .tolerance = TIPC_DEF_LINK_TOL, 804 .window = TIPC_DEF_LINK_WIN, 805 .mtu = TIPC_DEF_LINK_UDP_MTU, 806 .type_id = TIPC_MEDIA_TYPE_UDP, 807 .hwaddr_len = 0, 808 .name = "udp" 809 }; 810